Comparative Study of Advanced Classification Methods

Comparative Study of Advanced Classification MethodsCHAPTER 7TESTING AND RESULTS7.0 mental institution to software system mental footraceingingSoftware adjudicateing is the surgical operation of executing a course of study or frame with the intent of finding errors or termed as bugs or, it involves any activity aimed at evaluating an attri preciselye or efficiency of programming system and ascertain that it meets its required results. Software bugs allow for almost always exist in any software module with moderate size not because programmers are careless or irresponsible, but because the complexity of software is generally intractable and humans have only limited ability to tweak complexity. It is also true that for any complex systems, design defects can never be completely rule out.7.2 dischargeing ProcessThe basic goal of the software development process is to produce data that has no errors or very few errors. In an effort to detect errors soon after they are intr oduced, for each one phase ends with a verification activity such as review. However, most of these verification activities in the earliest phases of software development are based on human evaluation and cannot detect all errors. The sampleing process starts with a test plan. The test plan specifies all the test eccentric persons required. Then the test building elude is executed with the test issues. Reports are produced and analyzed. When testing of some unit complete, these tried units can be combine with other un time-tested modules to form new test units. Testing of any units involves the followingPlan test fibresExecute test cases andEvaluate the result of the testing7.3 Development of Test slicknesssA test case in software engineering is a set of conditions or variables under which a tester will determine whether an application or software system is correctly working or not. The mechanism for determining whether a software program or system has so longed or faile d such a test is cognise as a test oracle.Test Cases follow certain format, given as followsTest case id Every test case has an identifier uniquely associated with certain format. This id is used to track the test case in the system upon execution. Similar test case id is used in defining test script.Test case Description Every test case has a description, which describes what functionality of software to be tested.Test Category Test category defines business test case category like functional tests, negative test, accessibility test usually these are associated with test case id.Expected result and the actual result These are employ within respective API. As the testing is done for the web application, actual result will be available within the web page.Pass/fail Result of the test case is either pass or fail. Validation occurs based on expected and actual result. If expected and actual results are kindred whence test case passes or else failure occurs in test cases.7.4 Testing of Application SoftwareThe miscellaneous testing done on application software is as follows. integrating Testing7.4.1 Integration TestingIn this phase of software testing individual software modules are combined and tested as a group. The purpose of integrating testing is to verify functional, performance and reliability requirements placed on major design items. These design items, i.e. assemblages (or unit group of units), are exercised through their interfaces using black box seat testing, success and error cases being simulated via appropriate parameter and data inputs. Simulated usage of shared data areas and inter process communication is tested and individual subsystems are exercised through their input interface. Test cases are constructed to test that all components within assemblages interact correctly, for example across procedure calls or process activations, and this is done after testing individual modules, i.e. unit testing.The overall idea is a building block ap proach, in which verified assemblages are added to a verified base which is then used to support the integration testing of further assemblages, In this approach, all or most of the developed modules are coupled unneurotic to form a complete software system or major part of the system and then used for integration testing. Integration testing is a systematic technique for constructing the program structure eon at the same time conducting test to uncover errors associated with interfacing. The objective is to take unit-tested modules and build a program structure that has been dictated by design.The top-down approach to integration testing requires the highest-level modules be tested and combine first. This allows high-level logic and data flow to be tested early in the process and it tends to derogate the privation for drivers. The bottom-up approach requires the lowest-level units be tested and integrate first. These units are frequently referred to as public-service corpora tion modules. By using this approach, utility modules are tested early in the development process and the need for stubs is minimized. The third approach, sometimes referred to as the umbrella approach, requires testing along functional data and control-flow paths. First, the inputs for functions are integrated in the bottom-up pattern.7.4.1.1 Test Cases for Support Vector MachineSupport Vector Machine is tested for the associates which fall only on positive case of hyperplane, attributes which fall only on negative side of hyperplane, attributes which fall on both positive and negative side of hyperplane and the attributes which fall on the hyperplane. The expected results accord with the actual results. pillle 7.1 Test Cases for Support Vector Machine7.4.1.2 Test Cases for credulous Bayes ClassifierNaive Bayes Classifier is tested for the attributes which belongs to only class 1, attributes which belongs to only class -1, attributes which belongs to both class 1 and class -1. The expected results match with the actual results.Table 7.2 Test Cases for Naive Bayes Classifier7.5 Testing Results of Case StudiesA particular example of something used or analyzed in order to depict a thesis or principle. It is a documented study of real life situation or of an conceptional scenario.7.5.1 Problem Statement Haberman DatasetHaberman data set contains cases from the University of Chicagos Billings Hospital on the survival of patients who had undergone surgery for breast cancer. The job is to determine if the patient survived 5 years or longer (positive) or if the patient died within 5 year (negative).relation habermanattribute Age integer 30, 83attribute Year integer 58, 69attribute lordly integer 0, 52attribute Survival positive, negativeinputs Age, Year, Positiveoutputs SurvivalTraining SetTest SetWeight transmitter and gammaw =0.09910.07750.2813gamma = 0.3742Predicted Class label of test set murkiness matrix of the classifier rightful(a) Positive(TP)=8.000000 False Negative(FN)=27.000000False Positive(FP)=8.000000True Negative(TN)=110.000000AUC of Classifier = 0.517792Accuracy of classifier = 77.124183 delusion rate of classifier = 22.875817F_score=31.372549Precision=50.0Recall=22.857143Specificity=93.220339Confusion Matrix for SVMFig 7.1 Bar chart of SVM for various work MetricPredicted Class Label of Naive Bayes ClassifierTrue Positive(TP)=10.000000False Negative(FN)=25.000000False Positive(FP)=11.000000True Negative(TN)=107.000000AUC of Classifier = 0.5202Accuracy of Classifier =76.4706Error station of Classifier = 23.5294F_score=35.7143Precision=47.6191Recall=28.5714Specificity=90.678Confusion Matrix for NBCFig 7.2 Bar Chart of NBC for various Performance MetricTab 7.3 Comparison of SVM and NBC for various Performance Metric Fig 7.3 Bar Chart for Comparison of SVM and NBC7.5.2 Titanic Data setThe big dataset gives the values of four attributes. The attributes are social class (first class, second class, third class, and crew memb er), age (adult or child), sex, and whether or not the person survived.relation titanicattribute Class real-1.87,0.965attribute Age real-0.228,4.38attribute Sex real-1.92,0.521attribute Survived -1.0,1.0inputs Class, Age, Sexoutputs SurvivedTraining SetTest Setw = -0.10250.0431 -0.3983gamma = 0.3141Predicted Class label of test setconfusion matrix of the classifierTrue Positive(TP)=154.000000False Negative(FN)=181.000000False Positive(FP)=64.000000True Negative(TN)=701.000000AUC of Classifier=0.426392Accuracy of classifier in test set is=77.727273Error rate of classifier in test set is=22.272727F_score=55.696203precision=70.642202Recall=45.970149specificity=91.633987Confusion Matrix for SVMFig 7.4 Bar chart of SVM for various Performance MetricPredicted Class label of Naive Bayes ClassifierTrue Positive(TP)=197.000000False Negative(FN)=138.000000False Positive(FP)=148.000000True Negative(TN)=617.000000AUC of Classifier = 0.4782Accuracy of Classifier = 74Error Rate of Classifier = 26 F_Score = 57.9412Precision = 57.1015Recall = 58.806Specificity = 80.6536Confusion Matrix for NBCFig 7.5 Bar chart of NBC for various Performance MetricTab 7.4 Comparison of SVM and NBC for various Performance MetricFig 7.6 Bar Chart for Comparison of SVM and NBCDepartment of CSE, RNSIT2014-15Page 1

Should Hong Kong promote cultural tourism?

Should Hong Kong promote cultural tourism?Background Information, Related Concepts and Relevant KnowledgeObjectives/ Expected Outcomes (if any)Focus QuestionsTentative Enquiry Plan and Method(s) musingReferences11-rthk.hk http//programme.rthk.hk/rthk/tv/programme.php?name=tv/hkccd=2014-04-13p=858e=257861m=episode-20141115-2 The UNWTO World Tourism Organization, Definition, sustainable Development of Tourism, http//sdt.unwto.org/content/about-us-5, (15 November 2014).3-rthk.hk http//programme.rthk.hk/rthk/tv/programme.php?name=tv/hkccd=2014-04-13p=858e=257861m=episode-20141115-

Event Planning for Homeless Charity

Event intend for dispossessed CharityMichelle VillaruzBryan RodriguezTommy ThuChris SerranoGiveaways A Charity Event Helping the dispossessedMission Accomplish a well done community service for our nations contiguitys that ar experiencing homelessness and initiate an all important(p) way of getting resources. take to DescriptionConception The homeless need food, drinks, and bath and body essentials.Planning Catering to up to 75 homeless individuals, complete all tasks in three weeks.Retrieve $600 cash in hand (Donations, Salvation Army, (San Francisco) Department of Homelessness and Supportive Housing)Start collecting goods and equipment (tents, tables, trash bags) to dress up the charity particularFind volunteers (product counter, assistants, drivers)Promote Golden Gate Park in San Francisco, date and time TBDExecution The squirm out of the charity event goes well with the homeless retrieving their goods.Termination Clean up.Project Product Homeless retrieving food, drinks , and hygiene products.MilestonesFunds and donations retrievedResources complete (Volunteers, perishable items, equipment (tents, tables and trash bags, etc.)Make a website (Facebook page) + other promotionsSearch for a safe neighborhood parkSet up date, time, check weatherThe turn up is sincere and moving wellAssumptionsEverything goes as planned with cost, resources and time.If we do not sacrifice $600 in funds, well set another date for the event until we doIf we do not have enough resources (volunteers, equipment, items) well strive do with what we haveProposal Outline for Charity Event Helping the homeless Giveaways Executive unofficial Homelessness is a huge issue in San Francisco Bay Area as well as the unite States as a whole. Unfortunately, there are approximately 600,000 Homeless in America alone. Our team drawing card Bryan has requested ways to potentially fundraise for homeless and create ideas for a solution to homeless. His request includes unlike methods such as researching and fundraising. To create these ideas a basic knowledge on homelessness was needed. This included what it was like to be homeless and how some populate became homeless. After gaining some knowledge of homelessness it was necessary to find ways to two raise awareness for homelessness as well as ways to fundraise for our non-profit organizations Fund.Problem a skeleton statement of the problem or need (one to two paragraphs)The homeless need food, drinks, and bath and body products and we allow hold a charity event that go away cater to their needs.Solution a short comment of the put that includes what will take place, the benefit, how and where it will operate / work, for how long and who will staff it (one to two paragraphs) intimately collect donations (food, drinks, bath and body products) and purchase water bottles.Funding requirements an explanation of the amount of money need for the project and future living plans (one paragraph)The Salvation Army, Th e San Francisco Department of Homelessness and Supportive Housing are who we are grooming on getting funds from. Well be collecting essential donations.Organization and its expertise -name, history, purpose, activities and dexterity to carry out the proposal(one paragraph)Giveaways is a charity event held to cater to the homeless. It will be held in neighborhood parks. Donations of food, drinks, and hygiene products will be given away. Our team of volunteers will help make this work. With some funding from the Salvation Army and the SF Dept. of Homelessness and Supportive housing, we hope to carry out these good deeds.Statement of Need troika paragraphs that allow the reader to learn more about the issues, presents the facts and evidence that support the need for the project and establishes that your non-profit understands and usher out address the problem.-Use accurate, specific facts / data to support the project and illustrate the need.-Provide an example that hits home.-Pro vide hope (i.e. dont adept pour forth about how bad run-off from development, emphasize what can be done about it)-Put a human represent on it, provide real life examples and emphasize the needs of those servedWe need funds, donations, equipment, volunteers to successfully cater to the homeless.Project Description (See Above) Nuts and bolts of the project-Describe the project in a way that is interesting / compelling-Five sections OObjectives shape measurable improvements in behavior, performance, process or a tangible item that will result from the project.OMethods A detailed description of the activities leading to achieving the objectives that includes how, when (project timeline), and why the methods will work.OStaffing / Administration A short description of the effect of staff, their qualifications and what they will be doing.OEvaluation A description of how the organization and the funder will know the project is a success. What methods will be used to evaluate succ ess? What types of measures -qualitative or quantitative? Remember that success is not just completing a list of activitieswhat is the impact of the activity on achieving the objectives? Who will measure success?OSustainability Since funders seldom want to make a long term commitment to one organization, they want to know that the project will attract other funders. Evidence of current funding (for larger projects) is helpful and may be requested.Budget Provide a summary of direct and indirect expenses, as well as evaluate revenue, for the completion of the project. For ease of understanding, this summary is usually in the form of a chart and includes narrative to rationalise anything unusual.Estimated LaborVolunteersEstimated Materials200Estimated ContractorsNoneEstimated Equipment and Facilities400Estimated Travel15Total Estimated Cost815Organizational schooling (See Above) History, mission, and project fit within the mission, structure, programs and expertise, board, activit ies, staff, audience served, special needs of audience, why we are needed, and number of people reached through our programs. (one to two pages, maximum)Conclusion A concluding paragraph or two that is used to make a final pitch for the project.Everything goes as planned. Resources, cost, and time are met. Our clients (the homeless in San Francisco) have retrieved their essentials. ensample Proposal Letter Outline (a short version of the full length proposal)Ask for the gift -why you are writing and the funding request

Islamic and Conventional Banking: Customer Satisfaction

Moslem and Conventional riming client SatisfactionCustomer at geniusment is a railway line term which trea certain that how products and operate supplied by a compe real or business organisation converge or fulfil node expectations. Customer bliss is believed a very primal and observe mental process indicator within a business. In a competitive marketplace where businesses compete for guests, guest delight is a key differentiator and has become a very on the whole-important(a) element of business strategy. affirming is a client oriented work pains, thitherfore, the guest is the focus and client returns is the differentiating factors.When the hopes be offering al more or less the similar products and dos with two(prenominal) principal differences. It is the guest happiness that suffer influence the performance and trammel the competitiveness and success of either an Muslim or Conventional verify. depository monetary institutions flock with thousan ds of clients everyday and render different types of operate to them. It is a well cognise reality and fact that no business mountain exist and broadle with come forth clients. And the satisfaction of these customers is as important as the customers itself be important for every business.Satisfied customers are central to optimal performance and financial returns. separate understanding of customers cognitions is important for a entrust to limit the actions drived to meet the customers necessarily. bounds can identify their own strengths and weaknesses, where they stand in comparison to their competitors, graph out path future progress and reformment. Customer satisfaction beat helps to promote an additiond focus on customer outcomes and stimulate emendments in the work practices and processes apply within the company.1.2 Research ObjectivesThe main aim of this nurture is to-Review and discipline the literature available on both Muslim and Conventional bank w ith special computer address to Pakistan.Examine and evaluate the performance of the Islamic and unoriginal banks in Pakistan. hear out the aim of Customers cognition about the products and services provided by their banks.Find out the factors of customers dissatisfaction from the products and services of their bank.Find out the main factors of motivation for a customer to deal with either an Islamic or a stuffy bank.Find out that to what point customers are satisfied with their banks.1.3 Research QuestionsThe interrogation is target to examine the Islamic and received banking in Pakistan in resemblance to product analysis and customer satisfaction. This interrogation testament be helpful to answer the following questions- writ of execution of which form of banking is better than the otherwise and why?What are the main differences mingled with the products offered by the Islamic and Conventional banks in Pakistan?What is the customers satisfaction level with both forms of banking?What are the factors of motivation for a customer to deal with a bank?What are the main factors of customers dissatisfaction from a bank?Which form of banking is more reward and reliable in Pakistan?What are the suggestions and recommendation to improve the services and trading trading operations of both Islamic and Conventional banks?1.4 Research RationalThe searcher worked in a conventional bank for about 1 year, at the period when in that location was no Islamic bank in Pakistan. and there seemed to be a demand in the customer for such kind of banks at that clock time. Researcher is keen to start his career in the banking arena of Pakistan.At the moment there are about 35 banks operative in Pakistan out of which 6 of them are registered as Islamic banks, still majority of the Islamic banks started their operations very latterly. But if we compare them with conventional banks in Pakistan conventional banks are much older and large(p)r wherefore these Isla mic banks.The Researcher is committed to investigate the principal difference mingled with the both conventional and Islamic banks, their products, their reliability and the factors encouraging the customers to invest their m nonpareily in any of these two forms of banking. The detective will everywherely analyse the key factors which play their role in either the satisfaction or dissatisfaction of the customer of these banks and which form of banking is more successful in relation to customer Satisfaction and why? The researcher will to a fault come out with the suggestions to improve the service of the banks to satisfy their customer.1.5 Research Context cambers are playing various functions to provide variety of products and services for different welkins of the economy. Pakistan came into being in 1947 the first Pakistani bank started its operations the same year in the month of September. Since that time Pakistani banking sector is experiencing difficulties due to un func tional policies and uncertainty. Private domain banks strongly dominated during the first almost 20 years unless all the banks were nationalized in 1974, which proved disastrous move for the banking sector of Pakistan. communisation of hole-and-corner(a) banks badly affected the performance of these banks. So, these banks were privatized again in 1992. Pakistans banking sector consists of Scheduled commercial banks, which include nationalized, foreign and private banks. Pakistans banking sector has been press release finished a comprehensive provided entangled and very saddle-sore process of restructuring since 1997. It is aimed at making these institutions financially sound and forging their cerebrate firmly with the real sector for promotion of savings, investiture and proceeds. A do it turnaround in this sector will non be affirmable and is not expected as well but signs of improvement can be seen.Islamic banking was started in the late 70s in Pakistan, but it was ab initio introduced in the conventional banks. The first Islamic banking license was issued in 2002 to the Meezan Bank Ltd this bank started its operations in Pakistan in the year 2003. The Islamic banking has gained impetus worldwide. on that point are more than 185 Islamic banks and financial institutions operating(a) in the world. The popularity of Islamic banking in not limited to Islamic banks only. A large proceeds of conventional banks in Pakistan and all over the world are showing increase following in the Islamic banking system as well. The consequence of this is that Islamic banks operating in Islamic countries are face up with strong competition not only from Islamic banks but also from non-Islamic rivalsHabib Bank LtdHabib Banks Ltd. was the first commercial bank to be completed in Pakistan in 1947. Over the years, HBL has self-aggrandizing its branch network and become the largest private sector bank with over 1,450 branches across the country and a customer bas e exceeding five million kindreds.The Government of Pakistan privatized HBL in 2004 through which AKFED acquired 51% of the banks distributeholding and management control. HBL is majority owned (51%) by the Aga Khan enthronement company of Economic Development, 42.5% of the shareholding is retained by the Government of Pakistan (GOP), whilst 7.5% is owned by the ecumenic public i.e. over 170,000 shareholders following the public listing that took place in July 2007. Nepal, Nigeria, Kenya and Kyrgyzstan and rep offices in Iran and China, HBL is also the largest domestic multinational. The bank is blasting its presence in principal international markets including the UK, UAE, South and Central Asia, Africa and the Far East.Key areas of operations encom conduce product offering and services in sell and consumer banking. HBL has the largest corporate Banking portfolio in the country with an active investment banking arm. SME and Agri polish lending programmes and banking service s are offered in urban and rural centres.HBL is currently rated AA (Long term) and A-1+ (Short term) and has a ease sheet size over USD 11 billion. It is the first Pakistani bank to raise Tier II Capital from external sources.Meezan Bank Ltd.Meezan Bank Limited, a publicly listed company, was incorporated on January 27, 1997 and started operations as an investment bank in August that year. In January, 2002 in a historic initiative, Meezan Bank was granted the nations first fledged commercial banking license as a dedicated Islamic Bank, by the State Bank of Pakistan.Meezan Bank has understandably established itself as the largest Islamic Bank in Pakistan with the largest Islamic Banking branch network in the country. The banking sector is showing a hearty paradigm shift away from traditional means of business and is supply to an increasingly astute and demanding financial consumer, who is also becoming keenly certain of Islamic Banking. Meezan Bank bears the critical responsibil ity of lead the way front in establishing a stable and dynamic Islamic Banking system scarf out with dynamic and cutting-edge products and services.During the eight years of its operations as an Islamic commercial bank offering universal banking services to customers, Meezan Bank has been one of the fastest increment banks in the history of Pakistans banking sector. Average growth in deposits has been 55% per annum during this period while the branch network grew from 4 to201. The Bank has established a strong and credible management team comprised of go through passkeys, that acquire achieved a strong balance sheet with excellent operating profitability and strong ratios, which places the Bank at the top of the Islamic Banking industry. The Bank has been assigned a long-term entity rating of A+ with a constant outlook and a fiddling-term entity rating of A1.The Banks main shareholders are leading financial institutions of the Region viz., Noor Financial Investment Company, Kuwait, a leading investment company based in Kuwait Pak-Kuwait Investment Company, a abdominal aortic aneurysm rated financial entity in the country and the Islamic Development Bank of Jeddah. The established position, reputation, strength and stability, of these institutions add of import value to the Bank through panel representation and applied synergies.The bank has certain an extraordinary research and increment capability by combining investment bankers, commercial bankers, Shariah scholars and court- poseed experts to develop innovative, viable, and competitive value propositions that not only meet the requirements of todays complex financial world, but do so with world-class service excellence which our customers demand, all within the bounds of Shariah.Meezan Bank has a strong engine room focus. It has invested heavily in state-of-the-art software applications namely Temenos T-24 and Oracle. It has also recently upgraded its hardware platform and also has a hot di saster retrieval site in place to cater to any unforeseen eventualities.By implementing robust and aggressive strategic and tactical initiatives on the side of consumer banking, Meezan Bank aims to fulfil its prime target of providing customers accessibility and convenience, within an atmosphere and culture of dedicated service and recognition of their inevitably. The Bank has a rapidly growing branch network across all major cities nation-wide.Meezan Bank, believe in adding value to its customers lives and businesses through dynamic and competitive products and services that fulfil their inevitably while conforming all in all to the dictates of Shariah. At the same time, they endeavor to stomach competitive risk-adjusted returns to our stakeholdersLITERATURE REVIEWWithin the last few years, a number of studies urinate provided the discipline into thePractice of conventional and Islamic banking sector. An perspicacity of related studies is as follows-Islamic banks are striving to capture the maximum number of customers to compete with conventional banks by providing a large number of products as an filling for evoke based products. In Pakistan, banks are providing a wide range of products and services and facing intensive competition to get potential customers. Persuraman et al. (1985, 1991b) devised SERVQUAL model and investigated the service graphic symbol. They explored ten dimensions of service choice and sylphlike into five dimensions. It was documented that an increase in service quality and professional behaviour resulted a greater customer satisfaction and reduced customer erosion (Leeds, 1992). The relationship mingled with service quality and Customer satisfaction is becoming crucial with the increased level of awareness among bank customers (Sureshchander et al. 2002).The conventional banking theories assume that banks earn profits by purchasing deposits from the depositors at a low interest rate, then reselling those funds to theBorr owers at higher interest rate, based on its competitive advantage at gathering entropy and underwriting risk (Santos, 2000). Therefore, conventional banksMake profits from the spread between the interest rate received from borrowers andthe interest rate paid to depositors.Islamic banking is considered as a different banking stream as it prohibits interest and replaces with (a) profit share and (b) the profit share depends on the extent of the risk participation of the parties. The absence of pre-determined rewards is based on Quranic commands and as interpreted using Shariah rationales (Ariff, 2006).Islamic banks showed remarkable progress. It has captured a reasonable market share with excellent growth rate of 114% per annum. The increasing number and size of Islamic banks is also a unequivocal sign of development and success. There are six full-fledged Islamic banks running(a) in different cities of Pakistan and 13 conventional banks perplex started partial Islamic banking pr actices by establishing a large number of branches exclusively engaged in Islamic banking practices (SBP, 2006).The prohibition of interest in Islam ca utilize some writings to come forward with an idea to establish banks that do not work on interest basis. So the basic difference between Islamic banks and conventional banks is that Islamic banks are interest free banks whereas conventional banks are interest based banks. (Kahf 2006) Although interest and profit are very clear concepts but they are misunderstood by umpteen people. base difference between interest and profit is that interest is the reward to coin and profit is the reward to capital investment. In other words notes produces interest and capital investment produces profits. (Toutounchian 2004)Islamic finance has gripped the world with a strong commitment and passion. It has been depicted that interest in this segment has grown rapidly in almost 60 countries, not only in Islamic countries but in the leading spher ical financial centers. level United Kingdom has adopted an open door policy and provided a level playing field to Islamic finance and now capital of Singapore is following its lead. (Dr.Shamshad 2007)Islamic banking has shown tremendous growth in the past 20 years, with estimated deposits surpassing $80 billion in more than 45 countries. annual turnover is currently estimated at $70 billion and is projected to pass $100 billion by 2000. (OSullivan 1994, p. 7) For the last 60 years, the mode of banking in Pakistan was wholly of interest based but now there is a shift from western banking to Islamic banking in number of banks in Pakistan and also there are some new banks like Meezan bank which is totally based on Islamic banking. In 2007 Meezan Bank creates a significant milestone in the history of Islamic Banking by opening its centesimal branch in the city of Karachi. With 100 branches in 31 cities understandably positions the Bank as the leading Islamic Bank in Pakistan. deuce new dedicated Islamic Banks start operations in Pakistan, namely Emirates Islamic Bank and Dawood Islamic Bank. (Meezan Bank 2007)Mishkin (2001) reported that banking and financial services are the integral part of services industry and its contribution is increasing with the passage of time. However, expansion of global and integrated banking sector has to face many challenges of legislation, technological and structural changes (Angur et al. 1999). The relationship between service quality and customer satisfaction is investigated by a number of researchers across the globe. It is concluded that there is strong association between dimensions of service quality and overall customer satisfaction (Anderson and Sullivan, 1993).It is found that the banking industry has a link between service quality and customer satisfaction (Avkiran, 1994). Islamic banking practices resulted into a notable increase in the supply of loans. It is found that government intervention played an important ro le to manage funds besides other economic factors in the economy (Makiyan, 2003).Levesque and McDougall (1996) investigated the influence of key determinants of service quality on customer satisfaction in financial institutions. They found a substantial feign of service problems on customer satisfaction and their intensions to switch. It is suggested that service quality is an indwelling determinant of customer satisfaction (Yavas e t al., 1997). Islamic banks works in different parts of the world assessed their performance in reference to service quality and customers responses. An empirical bring was conducted to measure customer awareness and satisfaction by using a sample of 206 respondents towards Islamic banking in Jordan. It is observed that customers have awareness about products of Islamic bank but expressed a sense of dissatisfaction towards some of the services (Naseer, Jamal andAl-Khatib, 1999). Bahia and Nantel (2000) developed an alternative scale for measurement of service quality in retail banking. They developed BSQ and compared with SERVQUAL. They found that BSQ dimensions are more reliable than SERVQUAL dimensions. In another study SERVQUAL is compared with skilful/Functional quality of services in private banks. Results showed that Technical/Functional quality model is better (Lassar et.al, 2000). A survey of 801 customers indicated that customers perception of service quality differs in scathe of demographic characteristics (gender, ethnicity, education and income) of the respondents (Urban and Pratt, 2000).The working of the customers mind is a mystery which is difficult to solve and understanding the nuances of what customer satisfaction is, a challenging task. This exercise in the context of the banking industry will give us an insight into the parameters of customer satisfaction and their measurement. This merry information will help us to build satisfaction amongst the customers and customer loyalty in the long run which is an i ntegral part of any business. The customers requirements must be translated and quantified into measurable targets. This provides an easy way to monitor improvements, and decision making upon the attributes that need to be concentrated on in order to improve customer satisfaction. We can recognize where we need to make changes to create improvements and determine if these changes, after implemented, have led to increased customer satisfaction. If you cannot measure it, you cannot improve it. Lord William Thomson Kelvin (1824-1907).Oppewal and Vriens (2000) empirically investigated the relationship between service quality and customer satisfaction by using original SERVQUAL instrument with 10 dimensions as devised by Parasuraman et al. (1985). This study gave a direction to relate service quality and customer satisfaction. Service quality gained significance with the passage of time due to increased competition among service firms. It was examined that how customer satisfaction aff ects the customers behavioral consequences. The study found a strong impact of customer satisfaction on their decision to stay with the living service provider and take a hop their negative behavioral intentions. (Athanassopoulos, Gounaris and Stathakopoulos, 2001). Kayis, Kim and Shin (2003) conducted a comparative analysis of Australian and Korean banks to find out the quality management practices and its outcomes. They found a meaningful relationship between perceived service quality and customer satisfaction. They suggest that organizations should focus on service quality as an input to customer satisfaction for long-term benefits and business success. Now banks have recognize the importance of service quality for successful survival in todays global and highly competitive environment (Wang et al. 2003). Jamal (2004) investigated the customer behaviour in retail banking by considering service quality and its outcomes. It was observed that customers have varied experiences o f satisfaction and dissatisfaction for utilization of self-service technologies. Financial sector is becoming more cognizant about the performance evaluation regarding quality of products/services according to customers expectations. In another study, findings reveal a positive correlation between financial performance and customer service quality scores (Duncan and Elliott, 2004).Curry and scratch awl (2004) reported that service quality is inevitable for differentiation to compete in the banking sector. They suggested that the right service could retain the customers for long-term benefits. So, Banks should maintain the level of services by proper allocation of resources to meet customer requirements. Findings indicated that financial institutions require reasonable procedures to evaluate the overall satisfaction of their customers. However, understanding of changing needs and expectations of customers is an essential prerequisite for the financial sector (Joseph et al. 2005).J abnoun and Khalifa (2005) proposed and tested a measure of service quality to compare conventional and Islamic banks in UAE. The study found that four dimensions were significant in case of conventional banks. spot only personal skilland values were crucial in find service quality in Islamic banks. It is found that bank-customer relationship quality is evident between satisfied and dissatisfied customers. Both types of customers have clearly distinctive feelings regarding their service experience (Nelson and Chan, 2005). Al-Hawari and Ward (2006) found that customer satisfaction plays an inter-mediator role in the relationship between service quality and financial performance of the banks. In another study, overall customer satisfaction was investigated in Malaysian banking industry by collecting data from 220 customers of 15 retail banks. It was found that overall customer satisfaction is one of the key determinants of relationship quality (Nelson, 2006). It is suggested that bank should start service quality improvement programs to stir customer satisfaction and customer loyalty (Razak et al., 2007). On the basis of existing literature, this study examines the perception of bank customers regarding service quality and its impact on customer satisfaction in Pakistani banking sector, we test the following hypotheses.H1 There will be positive relationships between service quality and customer satisfaction regarding Islamic banks inPakistan.H2 There will be positive relationships between service quality and customer satisfaction regarding Conventional banks in Pakistan. investigate METHODOLOGYThe main purpose of this research is to analyse the level of customer satisfaction about Meezan Bank Ltd and Habib Bank Ltd in Pakistan. many an(prenominal) authors and writers have defined research and research methodology, most of them if not completely contradictory with each other but are substantially different.Websters collegial Dictionary (1977) defines researc h as Studious inquiry or testing esp. investigation or experimentation aimed at the discovery and interpretation of facts, alteration of accepted theories or laws in the light of new facts or practical application of such new or revised theories of laws?Andrew and Hildebrand (1982, p. 3) define research as The orderly procedure by which man increases his knowledge?3.1 RESEARCH PHILOSOPHY3.2 RESEARCH APPROACHResearch burn down means the approach or the methodology that has been adopted to conduct the research. Research approach involves the extract of research questions, the conceptual framework that has to be adopted, the selection of appropriate research method such as primary research, secondary research etc. There are mainly two types of research approach- inductive approachDeductive approachInductive ApproachAn inductive lean is one in which the premises are supposed to support the terminal in such a way that if the premises are true, it is tall(a) that the terminus wou ld be false. Thus, the inference follows probably from the premises and inferences. Here is an congresswoman1. Socrates was Greek. (Premise)2. Most Greeks eat fish. (Premise)3. Socrates ate fish. (Conclusion)It may seem that inductive arguments are weaker than deductive arguments because there must always remain the possibility of their arriving at false conclusions, but that is not entirely true. With deductive arguments, our conclusions are already contained, even if implicitly, in our premises. This means that we dont arrive at new information at best we are shown information which was obscured or unrecognized previously. Thus, the sure justice-preserving nature of deductive arguments comes at a cost.Inductive arguments, on the other hand, do provide us with new ideas and thus may expand our knowledge about the world in a way that is unacceptable for deductive arguments to achieve. Thus, while deductive arguments may be apply most often with mathematics, most other fields o f research make colossal use of inductive arguments.Deductive ApproachDeductive argument is one in which it is impossible for the premises to be true but the conclusion false. Thus, the conclusion follows necessarily from the premises and inferences. In this way, it is supposed to be a definitive proof of the truth of the claim (conclusion). Here is a standard example1. All men are mortal. (Premise)2. Socrates was a man. (Premise)3. Socrates was mortal. (Conclusion)As you can see, if the premises are true (and they are), then it simply isnt possible for the conclusion to be false. If you have a deductive argument and you accept the truth of the premises, then you must also accept the truth of the conclusion if you deflect it, then you are rejecting logic itself.3.3 Research outlineResearch Strategy basically refers to the method of data collection for the specified topic. The term entropy can be divided into further 2 branches.Primary entropyThe primary data basically refers t o data which is collected by the researcher for the purpose of answering the problem under discussion. Primary data will be collected throughSecondary DataThe Secondary data is being obtained by the literature study, journals and articles. Secondary data is normally used to understand the problem under discussion and its helps the Researcher to reach its conclusion.The Researcher will use a quantitative approach for this research study, growing and distributing a questionnaire to customers of Islamic and Conventional banks petition them about their experiences and attitudes in relation to their banks.The questionnaire will include three types of questions, 1) closed questions, requiring the respondent to answer yes or no, 2) open questions allowing the respondent to elaborate on their answers and 3) multiple choice questions, asking respondents to rate their responses on a scale.Primary data collection pattern quantitative or qualitative both methods have to be used appropriatel y in any research paradigm. The researcher will be using a quantitative approach. The survey strategy will be used to collect quantitative data which is associated with deductive approach and philosophically positivist.The Researcher will distribute questionnaires to the customers from both Islamic and Conventional banks, asking them to complete and return them to the Researcher.3.4 Research SampleIn research terms a sample is a group of people, objects, or items that are taken from a larger population for measurement. The sample should be representative of the population to ensure that we can generalise the findings from the research sample to the population as a whole.Probability sample means a method of sampling that utilizes haphazard selection. In order to have a random selection method, you must set up some process or procedure that assures that the different units in your population have equal probabilities of being chosen. humanity have long practiced various forms of r andom selection, such as picking a name out of a hat, or choosing the short straw. These days, we tend to use computers as the mechanism for generating random numbers as the basis for random selection.Non prospect sampling does not involve random selection but it does not mean that non probability samples arent representative of the population. But it does mean that non probability samples cannot depend upon the rationale of probability theory. At least(prenominal) with a probabilistic sample, we know the odds or probability that we have represented the population well. We are able to estimate confidence intervals for the statistic. With non probability samples, we may or may not represent the population well, and it will often be hard for us to know how well weve do so. In general, researchers prefer probabilistic or random sampling methods over non probabilistic ones, and consider them to be more accurate and rigorous.The Researcher will be using Probability Sampling method for its Primary data collection.3.5 Research Validity and ReliabilityThe research is designed very guardedly in order to maintain the level of validity and reliability. The study which is used is a test and re test approach in order to reduce unfairness and interviewee possible irritation. Both qualitative and quantitative research method are aimed to achieve high level of validity and reliability. Interviews are based on friendly manner to approach people have available time for interviews. Open ended and close ended questions on with some probe were going to be used during in-depth interview. The ethical tenet of collecting data is to avoid subjective selectivity in what we record. Researchers needs to nourishment his objectivity by making sure he collects all data and fully (Saunders M. et al 2007).3.6 Research EthicsThe ethical principle of collecting data is to avoid subjective selectivity in what we record. Researcher needs to maintenance his objectivity by making sure he col lects all data accurately and fully (Saunders, M. et al. 2007).Time Period andtask to doMarch 2010April 2010May 2010June 2010July 2010August 2010Weeks,17,Prepare dissertation proposal and entree before 29th April 2009.Continue searching the literature review and its accounting entry to supervisor.....Weeks,18,19..Weeks,20,21Interviewing with participants, and analysing of data simultaneously, gathered from each participant.Revision of draft and supervisors comments.Meeting with supervisor, Initial start

Overview of Cytokinins (CK)

Overview of Cytokinins (CK)FARA SHAKEELCYTOKININSCytokinins (CK) be a class of typeset yield substances (phytohorm nonpargonils) that promote cell division, or cytokinesis, in gear up grow and call fors. They be involved primarily in cell growth and incompatibleiation, plainly also affect top(prenominal) dominance, axillary bud growth, and leaf senescence.STRUCTURE OF CYTOKININSNATURE OF CYTOKININS Cytokinins are mixeds with a bodily structure resembling group A which promote cell division and consecrate another(prenominal) sympathetic functions to kinetin. Kinetin was the first kinin nonice and so named because of the heterogeneouss ability to promote cytokinesis (cell division). though it is a inhering compound, It is non made in plants, and is therefore normally considered a synthetic cytokinin (meaning that the hormone is synthesized somewhere other than in a plant). The most common form of course croakring cytokinin in plants today is called zeatin whic h was disjunct from give (Zea mays)Cytokinins have been found in about all higher plants as well as mosses, fungi, bacteria, and also in tRNA of many an(prenominal) an(prenominal) prokaryotes and eukaryotes. Today there are more than cc instinctive and synthetic cytokinins combined. Cytokinin concentrations are highest in meristematic regions and areas of continuous growth potential such as roots, young leaves, developing fruits, and seeds (Arteca, 1996 Mauseth, 1991 Raven, 1992 capital of Zimbabwe and Ross, 1992). record OF CYTOKININS In 1913, Gottlieb Haberlandt discovered that a compound found in bast had the ability to stimulate cell division (Haberlandt, 1913). In 1941, Johannes van Overbeek discovered that the milky endosperm from coconut also had this ability. He also showed that various other plant species had compounds which stimulated cell division (van Overbeek, 1941). In 1954, Jablonski and Skoog extended the organise of Haberlandt showing that vascular tissues c ontained compounds which promote cell division (Jablonski and Skoog, 1954). The first cytokinin was isolated from herring sperm in 1955 by miller and his associates (milling machine et al., 1955). This compound was named kinetin because of its ability to promote cytokinesis. Hall and deRopp reported that kinetin could be formed from deoxyribonucleic acid degradation products in 1955 (Hall and deRopp, 1955). The first of course occurring cytokinin was isolated from corn in 1961 by Miller (Miller, 1961). It was later called zeatin. Almost simultaneous with Miller Letham published a report on zeatin as a ingredient inducing cell division and later described its chemical properties (Letham, 1963). It is Miller and Letham that are credited with the simultaneous discovery of zeatin. Since that time, many more naturally occurring cytokinins have been isolated and the compound is ubiquitous to all plant species in one form or another (Arteca, 1996 capital of Zimbabwe and Ross, 1992).BIO SYNTHESIS AND transfiguration Cytokinin is generally found in higher concentrations in meristematic regions and festering tissues. They are believed to be synthesized in the roots and translocated via the xylem to shoots. Cytokinin bio entailment happens by dint of the biochemical modification of adenine. The process by which they are synthesized is as follows (McGaw, 1995 Salisbury and Ross, 1992) A product of the mevalonate pathway called isopentyl pyrophosphate is isomerized. This isomer can then react with adenosine monophosphate with the economic aid of an enzyme called isopentenyl AMP synthase. The result is isopentenyl adenosine-5-phosphate (isopentenyl AMP). This product can then be born-again to isopentenyl adenosine by removal of the phosphate by a phosphatase and further converted to isopentenyl adenine by removal of the ribose group. Isopentenyl adenine can be converted to the three major forms of naturally occurring cytokinins. Other pathways or slight alterations of this one probably lead to the other forms. Degradation of cytokinins occurs largely due to the enzyme cytokinin oxidase. This enzyme removes the side chain and releases adenine. Derivitives can also be made but the pathways are more complex and poorly understood.TRANSPORTvia xylem (transpiration stream)in peas, a signal from the leaves may signal/regulate transport of cytokinins from the rootszeatin ribosides are the main transport form converted to the free base or glucosides in the leavessome cytokinin also moves in the phloem.Mode of fulfilThe ratio of auxin to cytokinin plays an important role in the effect of cytokinin on plant growth. Cytokinin alone has no effect on parenchyma cells. When civilisationd with auxin but no cytokinin, they grow large but do not divide. When cytokinin is added, the cells expand and differentiate. When cytokinin and auxin are present in equal levels, the parenchyma cells form an undifferentiated callus. More cytokinin induces growth of shoot b uds, while more auxin induces root formation.Cytokinins are involved in many plant processes, including cell division and shoot and root morphogenesis. They are know to regulate axillary bud growth and apical dominance. The direct forbidding hypothesis posits that these effects result from the cytokinin to auxin ratio. This theory states that auxin from apical buds travels rout shoots to inhibit axillary bud growth. This promotes shoot growth, and restricts squint branching. Cytokinin moves from the roots into the shoots, eventually signaling lateral bud growth. Simple experiments support this theory. When the apical bud is removed, the axillary buds are uninhibited, lateral growth increases, and plants become bushier. Applying auxin to the take stem again inhibits lateral dominance.While cytokinin action in vascular plants is described as pleiotropic, this class of plant hormones particularizedally induces the variety from apical growth to growth via a three-faced apical cell in moss protonema. This bud induction can be pinpointed to differentiation of a specific single cell, and thus is a very specific effect of cytokinin.Cytokinins have been shown to slow aging of plant organs by preventing protein breakdown, activating protein discount, and bring together nutrients from nearby tissues. A study that regulated leaf senescence in tobacco leaves found that wild-type leaves yellowed while transgenic leaves remained mostly green. It was hypothesized that cytokinin may affect enzymes that regulate protein synthesis and degradation.CHEMISTRYA. Generaladenine derivatives (amino purines)occur as (a) the free nitrogenous base (b) a nucleoside (base + ribose) (c) a alkali (base + ribose + phosphate) or (d) glycosidesThe free base is the active form.approximately 40 different structures known.Zeatin (Z), which was first isolated from maize (Zea mays) is the most common cytokinin.Other naturally occurring cytokinins include, dihydrozeatin (DHZ) and isopentenyla denosine (IPA).B. Synthetic cytokininskinetin probably byproduct of zeatin degradationthere are several(prenominal) other substances with cytokinin activity such as benzyl adenine (benzylaminopurine BA).C. Cytokinins and nucleic acidscan occur as a modified base in tRNA, but the bases exist in the cis form, rather than the typical trans form. These modified bases that are found in all organisms from bacteria to plants to humans.The function of the tRNA cytokinins is not clear, but after hydrolysis of the tRNA the products can act as a cytokinin. The importance of the tRNA derived cytokinins in overall growth and development is not clear, either.Interestingly plants have different sets of tRNAs with different cytokinins that act in protein synthesis in the cytoplasm and the plastids.CYTOKININS FUNCTION A count of some of the known physiological effects caused by cytokinins are listed below. The chemical reaction will vary depending on the type of cytokinin and plant species (Davi es, 1995 Mauseth, 1991 Raven, 1992 Salisbury and Ross, 1992).Stimulates cell division.Stimulates morphogenesis (shoot initiation/bud formation) in tissue culture.Stimulates the growth of lateral buds-release of apical dominance.Stimulates leaf expansion resulting from cell enlargement.May enhance stomatous opening in some species.Promotes the conversion of etioplasts into chloroplasts via stimulation of chlorophyll synthesisROLE OF CYTOKININS IN PLANTSCytokinins are known from cytokinin-overproducing mutants to lift additional leaves and branches on the stem. The stems and leaves produce additional chlorophyll. Wounding often produces a new branch. pitch senescence is delayed. Apical dominance is released. Cuttings produce adventitious roots slowly and require additional auxin to reliably root. Tumors may form at nodes.The results of employ cytokinins could include release of apical dominance as you demonstrated in kidney beans in laboratory.Cytokinins regulate the cell cycle as we learned untimely in the semester.Cytokinins delay senescence. You carried out this project at home with isolated wheat primary leaf tips in various solutions of plant hormones. Those set with cytokinins should have demonstrated delayed senescence (stayed green longer). Of course, remember the auxin drug responsethere is such a thing as too much of a good thingCytokinins cause nutrient diversion. Cytokinin-treated leaves become sinks for nutrients such as amino acids. This is shown in a classic experiment in plant physiologyCYTOKININS CONJUGATIONAs you can see in the diagram below, the natural cytokinin ribosides can be attached to sugars to form glycosides that have rock-bottom or no cytokinin activity. The plant also can produce enzymes to cleave the sugar and restore full cytokinin activity. Thus articulation with sugars and retrieval from these bound forms is a possible pathway in plant cells.However, it is also true that the ribosides themselves are a form of conjugatio n. All studies to fight seem to indicate that the free-base has to be cleaved from the ribose too before the compound has any true activity. Plants carry out this reaction easily and rapidly, so ribosides appear to have activity on their own, but this is an artifact. Cells in culture require the cytokinin to be freethese sometimes lack the enzymes to cleave the ribose, so supplied ribosides are inactive and the free-base must be supplied in the medium.The indigen cytokinins also occur as modified bases in RNA and deoxyribonucleic acid strands. In fact cis-zeatin (a less active form) is found in many tRNA molecules in almost all living cells of all species The finish to which the free cytokinin pool is altered by conjugation with other nucleotides or released from nucleotide polymers is not clear.CYTOKININS DEGRADATIONIn addition to synthesis and conjugation, the pools of cytokinins can be altered by degradation. Below is how one natural cytokinin is made inactiveREFERENCEShttp// www.plant-hormones.info/cytokinins.htmKieber JJ (March 2002). Tribute to Folke Skoog Recent Advances in our catch of Cytokinin Biology. J. Plant Growth Regul. 21 (1) 12. doi10.1007/s003440010059. PMID11981613.Campbell, Neil A. Reece, Jane B. Urry, Lisa Andrea. Cain, Michael L. Wasserman, Steven Alexander. Minorsky, ray of light V. Jackson, Robert Bradley (2008). Biology (8th ed.). San Francisco Pearson, Benjamin Cummings. pp.82730.Chen CM, Ertl JR, Leisner SM, Chang CC (July 1985).GOVERNMENT COLLEGE UNIVERSITY,LAHOREPage 1

Neuroimaging Research To The Understanding Of Psychopathology Psychology Essay

Neuroimaging Re inquisition To The Understanding Of Psychopathology Psychology Essay everyplace the last ten years, neuroimaging techniques has been employed to an ever increasing extent in the investigation of the biological substrates of psychopathology (Malhi and Lagopoulos 2008). Non-invasive mavin imaging techniques much(prenominal) as front-runner and fmagnetic resonance imaging birth been prosperously applied in the emplacement of sensory sours (forefront Eijsden et al. 2009). For more interlacing psychological formes such as language, fMRI is now used to guide surgical decisions regarding hemispheric dominance in patients with refractory epilepsy (van Eijsden et al. 2009). Although still in its infancy (Crowe and Blair 2008), neuroimagings quick contri moreoverion has been hailed as signifi freightert (Linden 2008, Radaelli et al. 2008).Reli subject biomarkers be not cognise for to the highest degree, if not alone psychiatric infirmitys (Linden 2008). Limited knowledge concerning the aetiological mechanisms rudimentary disorders thwart efforts at special prevention and hamper secondary prevention out-of-pocket to the miss of reliable, comprehensive prognostic markers (Glahn et al. 2008). The lack of pathognomic neuronal markers, uncontrollableies achieving clinical consensus regarding symptomatic definitions and omen heterogeneity in spite of outance the existing diagnostic entities comport encouraged neuroimagings by-line of biomarkers and endophenotypes (Malhi and Lagopoulos 2008) (Pan et al. 2009). The look for agenda for DSM V under stacks this theme working towards an aetiological and pathophysiological establish diagnostic system rather than the current presage and syndrome base forward motion (Pan et al. 2009). Neuroimagings contribution washragthorn be through refining, validating and augmenting existing diagnostic classifications or replacement of the existing phenomenologically derived system with neuroanato mically defined biomarkers (Malhi and Lagopoulos 2008). Neuroimagings contribution uncloudedthorn be constrained by limited knowledge regarding inter officeal connectivity and interactions within the school principal (Honey et al. 2002). Furthermore, the pathways by which genic and environmental lay on the line factors interact and impinge upon demeanor ultimately manifesting as pathological symptoms is largely unknown (Glahn et al. 2008). Complexity is change magnitude advance by pictureation of the points of discontinuity amid psychopathology and normal innovation (Glahn et al. 2008).To date, the majority of neuroimaging research has attempted to correlate working(a), morphological and chemical abnormalities of the headland with the presence and/or severity of symptoms (Radaelli et al. 2008). Critics argue that neuroimaging research encourages a segregationist approach to psychopathology, attempting to map complex functions onto trenchant, localized intellect fiel d of operationss (Honey et al. 2002). This tendency has been influenced by assumptions within cognitive psychology (van Eijsden et al. 2009), namely that mental functions be comprised of modules with identifiable, specialised cognitive content processed by a computer interchangeable creative thinker (van Eijsden et al. 2009). Thus, elements of psychological function are assumed to activate specific, consistent brain regions, a model known as massive modularity(van Eijsden et al. 2009).Traditionally, neuroimaging techniques get hold of been categorized according to their entropy acquisition methodology, focvictimization upon structure, function, connectivity, electrophysiology or underlying chemistry (Pine 2006). Recent advancements in multimodal imaging (MMI) enables an admixture of approaches attempting to integrate the strengths of dissimilar techniques (Malhi and Lagopoulos 2008). Rather than detecting actual neural transmission, fMRI relies on the paramagnetic propert ies of deoxyhaemoglobin, providing an indirect measurement of the coupling amongst neural legal action and ancestry flow (Malhi and Lagopoulos 2008). Similarly, deary is an indirect measurement of neural activity bill consanguinity flow, metabolism or ligand-sense organ interactions of particular neurotransmitters (Zimmer 2009). Compared with SPECT, embrace contributes increase spatial and temporal resolution and permits imaging of a greater range of brain activity than SPECT tracers (Malhi and Lagopoulos 2008). However, it does not cristal equivalent spatial resolution to fMRI. DTI tractography images neural tract trajectories, enabling the modelling of white intimacy fibres localization, orientation, connectivity and integrity within the brain (Malhi and Lagopoulos 2008) (Honey et al. 2002) (Thai et al. 2009).Neuroimaging research wad adopt either a full-length brain or region of interest (ROI) approach (Malhi and Lagopoulos 2008) with important implications for inter pretation. As ROI approaches examine fewer brain regions than whole brain univariate approaches such as VBM, they offer increased statistical power with a concomitant drop in explanatory power (Ecker et al. 2010). In contrast, techniques such as VBM offer increased explanatory and moderate statistical power due to the essential of multiple comparison corrections. Therefore, mass univariate approaches whitethorn be too materialistic to detect subtle neuroanatomical abnormalities particularly with small attempts (Ecker et al. 2010). Additionally, neuroimaging studies can be contrasted in terms of info-based design ranging from block, factorial to the about recently developed event-related designs. Event-related designs permit randomization of experimental specialises throughout scanning (Honey et al. 2002), allowing the resolution to a single event to be examined in a context-independent appearance (Friston et al. 1998).This paper will treasure the possible applications of neuroimaging research to the understanding of psychopathology in terms of its existing contribution and developments which may arise due to further technological innovations in the future. Initially, it will provide a instruct introduction to a number of methodological controlations associated with neuroimaging research. Following this discussion, it will generally focus upon neuroimagings contribution to aetiological research of psychopathology. In addition, it will evaluate the application of neuroimaging techniques to diagnosis, prognostic considerations and intercession. The paper will reason with a recapitulation of recent technological developments within neuroimaging and evaluate the extent to which these innovations may further increase neuroimagings application to the understanding of psychopathology.Methodological and Technological considerationsCritiques of neuroimaging research as The New Phrenology in its attempts to locate complex psychological phenomena in dis tinguishable brain regions stick out been described as the localization fallacy. The complexity of conducting research with patient groups and interpretation of associated runs is emphasised when patient characteristics are considered (Honey et al. 2002). Psychiatric conditions are heterogenous in their demonstration and unwieldy to define as discrete and homogenous entities. This increases the difficulty in obtaining a clinically homogenous sample for research purposes. Disorder and symptom heterogeneity manifesting as inconsistent neuroimaging findings may be a will of disagreeent aetiological pathways, vari expertness in compensatory processes, chronicity of illness or the patients unique symptom profile (Honey et al. 2002). These inherent difficulties have been exhibit by conflicting findings of hypo facadeity in Schizophrenia (Keshavan et al. 2008) and led to the following conclusion as long as we are not able to disentangle the heterogeneity question at the clinical lev el, it is not apparent that heterogeneity at the aetiological and pathophysiological levels can be resolved (Peralta and Cuesta 2000). If a well matched sample is obtained, their symptomatic profile may be a manifestation of the final common pathway of disorder rather than runing a group matched for common aetiological mechanisms (Honey et al. 2002). To counteract these issues, many neuroimaging studies have follow a symptom level approach, for example exclusively examining AVH (Honey et al. 2002). Critics have argued that symptom provocation studies may be imaging interference processes, compensation for skeletal functioning or opposite co-occuring symptoms (Honey et al. 2002). If the assumption that symptoms occur in closing off is correct, their location within discrete brain regions may over overly simplistic, it is more likely they are an element of complex, dynamic neural activity (Honey et al. 2002). The phenomenon of pure insertion asserts that a phenomenon of interes t can be determine or manipulated in isolation from other mental processes (Honey et al. 2002). For example, linear increases in cognitive load ( caper demand) may not be associated with linear increases in neural activity. Furthermore, is it conceivable that ruminations in OCD can be isolated from other processes such as memory, attention and speech? (Honey et al. 2002). The subtraction technique is the close comm solitary(prenominal) employed method to identify brain surface areas that are industrious relation to one another therefore, experimental task pairs should only differ in terms of one parameter. This is based on the assumption that by changing one parameter, that only one aspect of processing is altered (Nair 2005).Neuroimaging results may thus be misinterpreted as the cause of disorder or the disorder itself (Fuchs 2006). Thus, there are a number of important issues to consider when interpreting neuroimaging results such as whether differences invent a symptom pro file, a diagnostic entity and whether differences within these groups relate to recount related phenomena or underlying aetiological differences at the genotype level (Honey et al. 2002). These ambiguities have led nigh researchers to question neuroimagings utility to aetiological research advocating a focus upon diagnostic imaging (Honey et al. 2002). Recent shifts towards a focus upon systems level, dynamic connectivity within the brain appears to be counteracting neuroimagings characterisation as the new phrenology (Zhou et al. 2009).The complexity of neuronal function has important implications for the analysis and interpretation of neuroimaging results. It is necessary to quantify both the relationship amongst neuronal activity and indirect measures of it via the haemodynamic solvents and the associated temporal delay (Honey et al. 2002). It has been shown that reckless signals are more responsive to increases rather than decreases in blood flow, known as the haemodynamic rectification aftermath (Keri and gulyas 2003). These subjects become increasingly complex when the contribution of neurotransmitter release and re breathing in, receptor binding and electrical activity to rCBF, metabolic changes and deportment are considered (Keri and gulyas 2003). For example, low levels of neuronal activity may not be accompanied by rCBF changes, in a embrace experiment, the lack of activation in this area does not exclude the area from being involved in the response under examination (Keri and Gulyas 2003). In contrast to sustained stimulation, rapid changes in the brains functional suppose result in a brief uncoupling of perfusion from oxidative metabolism (Keri and Gulyas 2003). Imaging procedures must in like manner model the effect of major blood vessels draining spark off brain regions (Honey et al. 2002). Existing technology does not offer equivalent spatial resolution across the whole brain, there are also inherent difficulties differentiating betw een excitatory and inhibitory activation when using the proxy of the haemodynamic response (Honey et al. 2002). The complexity is further increased when the impact of experimental design is considered. fMRI images particularly those based on block designs oftentimes are static representations of haemodynamic activity reasonabled over time (Nair 2005). Furthermore, activity in some regions may only be detectable with more forward-looking event-related rather than block designs (Fusar-Poli et al. 2007). However, it has been shown that even in event-related fMRI paradigms that short interstimulus intervals result in an overlap of haemodynamic responses to individualistic events (Ecker et al. 2008), thereby precluding confident analysis of condition specific activity. It has also been demonstrated that path co-efficients within SEM fMRI reflect changes in the temporal characteristics of the HFR induced by experimental design (Ecker et al. 2008) emphasising the effect of experimental design on effectual connectivity studies.Recent developmentsIn recent years there has been increased interest in furthering understanding of interactions between brain regions known as connectivity analysis (Sato et al. 2009b). Functional connectivity refers to the dynamic relationships between brain regions typically based upon correlational analyses (Thai et al. 2009). Effective connectivity studies infer causative or modulatory relationships between brain regions or meshs and their directional, temporal interactions (Thai et al. 2009). SEM and DCM are the most commonly employed methods to investigate connectivity within fMRI data (Sato et al. 2009b). In SEM, the strength of an interaction is provided by a path co-efficient measuring the average influence of one ROI on another in a condition time period (Ecker et al. 2008). For example, using effective connectivity, it was demonstrated that the sACC and pACC had a immobile directional influence on the right amygdale during a n emotional processing task (Zhou et al. 2009). Rather than occurring as functionally distinct, feedforward sequential processing stages, it was shown that mental gyration performance includes both feedforward and feedback connections with indirect conclusion of parallel processing (Ecker et al. 2008). automobile learning and pattern recognition methodologies, such as SVM are stringy techniques for the classification and prediction of mental states so called brain reading or decoding (Sato et al. 2009a) (Sato et al. 2009a). SVMs are used to identify statistical properties of imaging data which discriminate between groups of participants or brain states (Sato et al. 2009b), essentially, whether a new note belongs to a training data set or otherwise. Not only do they offer the potential to categorize, their ability to anatomically localize prejudiced information generated by the classification process presents the possibility of brain social occasion (Sato et al. 2009a). Potenti ally, this methodology could be used to describe a healthy population, measuring the distance of subsequently tested participants from normative fMRI data (Sato et al. 2009b). For example, SVMs ability to distinguish between visual and auditory stimulation was 95.34% +/- 18.77 (Sato et al. 2009a). ANN and SVM based tools have employed in the identification and classification of pathology of patients with Alzheimers or Parkinsons disease from interpret participants (Bose et al. 2008).The development of imaging genetics offers the possibility of mapping the biological pathways and mechanisms whereby individual differences in brain function emerge and potentially predispose individuals to risk of psychological disfunction (Viding et al. 2006). It enables the evaluation of the functional impact of brain pertinent genetic polymorphisms with a view to understanding their impact on demeanour (Viding et al. 2006). For example, studies of healthy adult 5-HTTLPR S allele carriers found inc reased amygdaloid nucleus activation, reduced white-haired-haired matter mountain of the perigenual ACC and amygdale and altered functional connectivity of the pACC and amygdale relative to the LL genotype. Furthermore, 30% of variance in behavioural harm avoidance scores during this fMRI challenge paradigm was predicted by amygdala pACC functional connectivity (Viding et al. 2006).etiologySignificant ambiguity remains surrounding the pathogenesis of schizophrenia (Keshavan et al. 2008). Although the majority of psychological disorders are thought to be multifactorial in origin (Glahn et al. 2008), genetic factors appear to exert a significant aetiological influence on the major psychoses, twin studies estimating heritability at 80% (van Os and Kapur 2009). Structural MRI studies have revealed reductions in whole brain and grey matter record as well as increases in ventricular volume (Keshavan et al. 2008 van Os and Kapur 2009). Reductions have been observed in temporal lobe structures (in particular the genus Hippocampus, amygdala and the topnotch temporal gyrus) and the anterior cortex, thalamus, AC and corpus callosum. There is evidence of a relationship between best temporal gyrus volume and positive symptoms medial temporal lobe reductions correlating with memory impairment. Qualitatively similar but less marked structural changes have been observed in the affective disorders. Whilst structural abnormalities may be consistently found in Schizophrenia, they are diagnostically non-specific and may be common amongst patients across diagnostic classifications. Evidence of continuous tense brain changes during the course of schizophrenia suggests that structural abnormalities may be a result of early and later developmental dysfunction (Karlsgodt et al. 2008). The onset of crude(a) symptoms has been associated with liberalist changes. Using longitudinal research designs, deviations from normative development can be examined (Serene et al. 2007). For example, longitudinal studies of early onset schizophrenia demonstrated progressive grey matter loss across the lateral surface of the brain, with treatment refractory patients displaying the most enounce and rapid cortical grey matter loss. However, the explanatory power of progressive brain structural changes as the essential pathophysiological process within schizophrenia is diminished due to the presence of potentially confounding factors secondary to the illness such as symptom profile, severity, medicine history and status and the duration of illness (Karlsgodt et al. 2008). Furthermore, structural changes are generally subtle and of relatively small effect sizes (Keshavan et al. 2008).Inconsistency has mired findings of hypofrontality in Schizophrenia, functional imaging meta-analysis have calculated moderate effect sizes for activated and resting state conditions. Conversely, once performance differences are controlled for, patients have shown increased prefrontal act ivation relative to controls perhaps indicative of an inefficient frontal response to task demands. There have been similarly inconsistent findings regarding other brain regions. Functional imaging research has found alterations in prefrontal and now and then temporal lobe function (Shergill et al. 2007), with speculation regarding a specific abnormality in the reciprocal modulatory interaction of frontal areas and the genus Hippocampus (van Os and Kapur 2009). Hyper- and hypoactive network responses have been demonstrated depending on experimental paradigm (van Os and Kapur 2009). Inconsistencies in the functional imaging literature may be a result of the diverse experimental designs employed, non-uniform standardization of resting state conditions, lack of control for performance differences, typically small sample sizes and medication confounds which curtail the interpretability of these results (Keshavan et al. 2008). MRS studies have corroborated regions concerned by structural and functional imaging results demonstrating reductions in neuronal and membrane integrity in at risk and early schizophrenic groups. However, it can be concluded that many of schizophrenias putative biomarkers are of less than square-built effect sizes, non-specific and too time consuming or expensive to consider implementing as potential diagnostic biomarkers (Keshavan et al. 2008). It is proving difficult if not impossible to condone the features of this disorder and its associated functional deficits in terms of selective, focal abnormalities (Fusar-Poli et al. 2007).The disconnectivity hypothesis of the pathophysiological derriere of exposure to psychosis implicates abnormal interaction/disconnectivity of the prefrontal cortex, temporal lobe and subcortical regions (Fusar-Poli et al. 2007). Findings of pallid functional connectivity of the medial prefrontal, thalamic and cerebellar regions in relatives of patients with schizophrenia have provided withstand for this view (Fusar-Poli et al. 2007). Although evidence for disconnectivity in schizophrenia is unassailable, its relationship to aetiology, pathophysiology and implications for symptomatic behaviour remain ill-defined (Stephan et al. 2009).AVH have been found to activate a massive network of language areas in the frontal and temporal lobes and limbic areas such as the amygdale and hippocampus (Vercammen et al. 2009). The subjective intensity of AVH has been correlated with activation of the primary auditory cortex. Schizophrenic patients who own AVH have been found to activate differential brain areas relative to healthy controls and non-hallucinating patients with schizophrenia, displaying altered activation of the anterior cingulate and superior temporal regions bilaterally (Mechelli et al. 2007 Shergill et al. 2007). DTI studies have demonstrated differences in the orientation of white matter fibres relative to patients without AVH and healthy controls. Examining the effective connect ivity of AVH using DCM demonstrated a specific impairment of functional desegregation between the left superior temporal cortex and the dorsal part of the ACC during the evaluation of self and estrange generated speech in patients with AVH (Mechelli et al. 2007). This implies a relationship between impaired functional integration and AVH experiences, Mechelli et al, speculate that a similar impairment in effective connectivity may diminish patients ability to process their own inner speech. Furthermore, a whole brain DTI exact illustrated that propensity to experience AVH was associated with increased fragmental anisotrophy (FA) within lateral aspects of the superior longitudinal fasciculi bilaterally, the main connection area between Wernickes and Brocas areas (Shergill et al. 2007). Similar differences in FA have been reported in at risk and starting signal episode patients. However, it is possible that these connectivity changes may be a result of experiencing AVH rather tha n being causative in nature. Increased absolute frequency of AVH may enhance connectivity in these regions.Studies conducted during the prodromal phase permit the likely investigation of the pathophysiological processes underlying vulnerability and development of the disorder (Fusar-Poli et al. 2009 Pantelis et al. 2003).Neuroimaging studies have demonstrated qualitatively similar abnormalities to those evident in established schizophrenia and bipolar to those present in first episode psychosis and individuals without psychosis but with a strong familial risk (Pantelis et al. 2003). At risk individuals who subsequently developed psychosis had small grey matter volumes in the right medial temporal region, including the hippocampus and parahippocampal cortex, in a right lateral temporal region comprehend the superior temporal gyrus, a right inferior frontal region including the orbital portion of the inferior frontal gyrus and adjacent split of the insula and basal ganglia and a cingulate region including the anterior and posterior cingulate gyrus bilaterally which mimics findings in probands of MZ twin pairs discordant for schizophrenia, first degree relatives of patients with psychosis and people with schizotypal nature disorder. Longitudinal examination of patients who transitioned to psychosis, showed a significant bilateral reduction in grey matter volume between baseline and follow up in the cingulate gyri, the left parahippocampal gyrus, left fusiform gyrus and left OFC (Pantelis et al. 2003). This study demonstrated that pathophysiological anomalies predate the onset of overt psychosis but that further grey matter volume changes are associated with the first expression of frank symptoms. It is unclear however, whether these changes represent a cause or effect of psychosis. Pantelis et al conclude that MRI may in the future prove a of import tool in the identification of ultra high risk individuals.Neurochemical PET and SPECT studies investigating the dopamine hypothesis of schizophrenia with 18 F-dopa and 11 C-raclopride have shown that schizophrenia in its acute psychotic state is associated with an increase in dopamine synthesis, dopamine release and resting state dopamine minginess (van Os and Kapur 2009). Research has also demonstrated pre-synaptic dopamine overactivity in schizophrenic patients and first episode patients (Fusar-Poli et al. 2009)Studies of prodromal patients have demonstrated elevated Striatal 18 F-dopa uptake with levels approaching those of Schizophrenic patients (Howes et al. 2009). 18 F-dopa uptake in the ARMS was at once correlated with symptom severity and the degree of neuropsychological impairment. The most pronounced dopaminergic abnormality was found in the associative subdivision of the striatum in both schizophrenic patients and individuals with an at risk mental state (Howes et al. 2009). Thus, it has been suggested that pre-synaptic striatal dopamine function may be a worthwhile target f or young drug development and that these findings may provide a neurophysiological rule for the introduction of anti-dopaminergic preventative intervention in high risk individuals (Howes et al. 2009).Multimodal studies of a verbal fluency task during the ARMS demonstrated an association between altered prefrontal activation and striatal hyperdopimergia (Fusar-Poli et al. 2009). Controlling for performance differences, there was increased activation of the left inferior frontal gyrus and the right warmheartedness frontal gyrus suggesting reduced efficiency or a compensatory process to achieve a similar behavioural response as controls. overture in prodromal symptoms has been associated with a normalization of the exaggerated inferior frontal response during a verbal fluency task. Previous findings linking the degree of bloom of striatal hyperdopimergia with symptom severity suggest that striatal hyperdopaminergia may underlie both symptoms and neurocognitive dysfunction althoug h it is possible that another pathway is responsible. The observed correlation may represent the effect of prefrontal cortex on striatal dopamine or ill-doing versa. Crucially, this study demonstrates that abnormalities which were heretofore regarded as key pathophysiological features of Schizophrenia are correlates of vulnerability rather than sufficient for development of the disorder (Fusar-Poli et al. 2009).Interpretation of ARMS findings is difficult due to uncertainty regarding the degree to which they reflect trait or state factors, that is, psychosis liability or prodromal symptoms (Fusar-Poli et al. 2007).Thus, neuroimaging findings indicate changes in gray matter structure indicative of connectivity deficits at the level of synaptic connections and neuropil allied with white matter changes indicative of large scale deficits in connections between cortical regions (Karlsgodt et al. 2008). Although several biological abnormalities have been replicated (abnormally large vent ricles, abnormal dopamine concentration and altered P300) they are not sensitive enough (usually only seen in 40-50% of patients) or not specific enough (seen in only 30% of first degree relatives) to be of diagnostic influence (van Os and Kapur 2009). apprehension DisordersNeuroimaging research of anxiety disorders have implicated brain areas involved in the stress response as being associated with anxiety symptoms, including the prefrontal cortex, hippocampus and amygdala (Engel et al. 2009). However, potential brain structures implicated in the pathophysiology of anxiety disorders are extremely difficult to image due to their sizes and locations these include the amydala, brainstem nuclei and periaquaductal gray (Engel et al. 2009). Neuroimaging of PTSD highlights many of the complexities involved in conducting this research. Complexities relate to symptom presentation in terms of their multivariate content and emotional arousal in particular during the retrieval of traumatic me mories (Peres et al. 2008). Symptomatic heterogeneity is extremely difficult to control for, additional potential confounds include nature of the traumatic experience (s) and the length of time since its occurrence. It is questionable whether it is appropriate to generalize from imaging results based on a sample of war veterans to survivors of childhood abuse (Peres et al. 2008). However, the results of neuroimaging studies appear to offer support for two broad subtypes of PTSD, one being mainly dissociative, the other characterised by intrusions and hyperarousal (Malhi and Lagopoulos 2008). Structural studies have demonstrated reduced ACC and hippocampal volumes in studies across a variety of traumatic experiences. Increased amydala activation has also been observed (Crowe and Blair 2008). Impaired hippocampal function has been speculatively linked to the memory atomization process observed in PTSD (Peres et al. 2008). However consistent findings of structural or functional change , they do not necessarily imply a causative relationship.DepressionResearch investigating the pathophysiology of depression have highlighted lessen anterior paralimbic and cortical activity in both major and bipolar depression (Malhi and Lagopoulos 2008). These decreased activation patterns are found to reverse with successful treatment. For example, in studies of major depression it has been observed that diminished activation of the dorsalateral prefrontal cortex can be increased following effective treatment. PET studies of the serotonin transporter SERT have demonstrated increased thalamic SERT in downhearted patients relative to controls. Across the affective disorders, findings of hyperamydala and hypofrontality have led to speculation that these abnormalities may represent a critical pathway or potential predictive biomarker for those at risk of future development of psychopathology (Viding et al. 2006). However, it remains unclear as to whether these findings represent st ate or trait related function. The search for trait related biomarkers offers the potential to uncover early warning signs of impending psychological disorder as they may be present anterior to symptom onset (Malhi and Lagopoulos 2008). The clarification of state related changes affords the possibility of supervise differential responses to treatment over time (Malhi and Lagopoulos 2008). Cautious interpretation of existing neuroimaging findings is advised due to the complexity of emotional networks and lack of understanding regarding their integration with higher cognitive processes (Malhi and Lagopoulos 2008).DiagnosisAs of yet there are a limited number of neuroimaging studies attempting to classify or categorize disorder (Glahn et al. 2008). Ongoing research endeavours to uncover pathophysiological biomarkers complements the development of diagnostic imaging systems.The find of biomarkers of schizophrenia may assist in early diagnosis and haveprognostic regard as (Bose et a l. 2008). Initial diagnostic research efforts focused on measurement of striatal D2 receptor levels. Although it appears that striatal D2 receptor levels are elevated in schizophrenia, inconsistent and variable PET and SPECT results (possibly related to samples tested) have precluded its use as a diagnostic variable (Bose et al. 2008). Machine learning and pattern recognition techniques provide methods for analysing imaging data that may improve the sensitivity and specificity of diagnosis (Bose et al. 2008). Using ANN modelling of striatal 18F fluro-L-DOPA influx constants, it was found that an ANN model correctly classified 84% of schizophrenic patients and 74% of controls (Bose et al. 2008). Sensitivity analysis revealed that the posterior putamen and anterior caudate nucleus were the most important areas within the ANN classification. The addition of multiple risk factors to the ANN classifier such as neuropsychological, genetic or structural imaging results may improve the ANN classifiers accuracy further (Bose et al. 2008). Bose et al, 2008 suggest the potential util

Formation and Drainage of Supraglacial Lakes

Formation and Drainage of Supraglacial LakesGlacial Processes and Geomorphology Degree designationB028303What find outs the governing body and drainpipe of supraglacial lakes on the Greenland sparkler public opinion poll and to what extent argon these dishes an important control on sorbet tacking dynamics? establishmentThe Greenland spyglass Sheet is a prominent applesauce mass in the Northern Hemisphere, made up of both land terminating and tide piddle terminating outlet glaciers. seasonal worker come near resolveing produces warming water that collects on the shape up of the Greenland frost tab in the form of supraglacial lakes (Luthje et al., 2006).The storage and drainage of lake water is specially important in forcing a hydraulic connection betwixt the nut sail surface and the rubbish hunch forward interface (Bartholomew et al., 2012). For this reason, drainage of these supraglacial lakes is of ill-tempered interest in understanding the influence that they have on glass rag dynamics. Supraglacial lakes have been know to drain in less than mavin day (Box Ski, 2007). The fluctuations in surface water delivered to the glacier hunch over from the quick drainage of these lakes are known to affect the accelerate that the ice sheet travels at and have been known to cause local stimulate of the ice sheet (Sundal et al., 2011).The purpose of this paper is to discuss the factors that control the formation and drainage of supraglacial lakes on the Greenland ice sheet and the implications these processes have on the control of ice sheet dynamics.FormationIn cases where drainage is prevented, work water gage be stored on the ice sheet by a form of posit or ice barrier, creating a supraglacial lake (Benn Evans, 2010). Seasonal warming produces unfreeze water that collects in closed surface undulations on the surface of the ice sheet. The supraglacial lakes crossways the Greenland ice sheet vary in size from a a couple of(prenomi nal) hundred meters to 1500m in diameter, with wisdoms of 2-5m (Box Ski, 2007).Supraglacial lakes form in the ablation area of the Greenland ice sheet during summer time dissolve season. Positions of numerous lakes have been monitored oer many years and from the results it can be deduced that most lakes form in the kindred place every year (Luthje et al., 2006). Supraglacial lakes can occur crosswise much of the ablation zone on the Greenland ice sheet all when are especially prominent on the Western transect (Luthje et al., 2006). The formation and lieu of supraglacial lakes on the Greenland ice sheet is driven by season and temperature, peak and topography (Chu, 2014).There is an upper limit imposed on the lake distribution and formation by elevation because of temperature and base sliding restrictions (Liang et al., 2012). Due to the lapse rate, temperature decreases with elevation. When it reaches a certain point on the ice sheet it becomes too frosty for melting to so there is no melt water for call for the lake privys. As roll in the hayrock topography is only expressed in ice surface topography in regions experiencing basal sliding, interior regions of the ice sheet that do not nonplus basal sliding are unlikely to contain ice surface depressions suitable for lake formation (Liang et al., 2012). Figure 1(a) shows a histogram of the rate of channel of lake area over 10 years of observations. In (b) only the fiftieth percentile shows a significant relationship with melt intensity. From the two graphs it can be deduced that there is a positive correlation amid one-year median lake elevation and annual melt intensity, indicating that lakes are more than(prenominal) quick at higher elevations during warmer or more intense melt years (Liang et al., 2012). During more intense melt years, lake drainage events become more common in higher elevations. These regions, which dont normally experience rapid surface water beam to the prat of the glacier become more susceptible to moulin formation (Liang et al., 2012). Only lakes above 1050m show inter-annual changes in receipt to seasonal changes in melting intensity (Liang et al., 2012).The area of supraglacial lakes is more controlled by the local topography. Lakes at lower elevations tend to be smaller because the steep ice surfaces prevent as much water being roll up and stored (Bartholomaus et al., 2007).Although topography and elevation influence the formation and distribution of supraglacial lakes in Greenland, the main control is the season. The lakes willing only form during melt season, when temperatures become warm copious to produce melt water to fill the empty lake basins (Luthje et al., 2006).DrainageIn order for melt water stored as supraglacial lakes to reach the bed of a glacier, a finished ice transport remains is required. In a study, Das et al. (2008) monitored and observed the rapid drainage of two openhanded supraglacial lakes megabucks to the base of the Greenland ice sheet. The lakes, on the Western side of the Greenland ice sheet began filling in early July, reaching maximum extent or so the 29th of July. At first, lake levels began to fall slowly and steadily and then levels dropped rapidly. This rapid drainage event drained the lake in around 1.4 hours (Das et al., 2008).From observations, it can be deduced that the drainage of the lake occurs in four stages. First of all initial slow, tranquillise drainage occurs with crevasses (Chu, 2014). No water reaches the bed of the glacier, suggesting an inefficient drainage agreement. Next, connection to the bed occurs and drainage through a scissure system occurs. This stage gives fast and direct drainage of the lake to the bed of the glacier. Thirdly, Moulin formation and mop up of the fracture system occurs. Frictional heating from the turbulent water scarper and rapid drainage in stage two melts through fracture walls, developing them into discrete moulins (Chu, 2014). Moulins are associated with rapid lake drainage and immediate transfer of water to the ice sheet (Chu, 2014). This rapid transfer of water to the glacier bed has potential to bury the subglacial hydrologic system. The final stage occurs once the lake has drained. Moulins stay outdoors to allow the drainage of surface melt to the bed of the glacier (Das et al., 2008). Evidence suggests that moulins in existence in the bottom of the lakes fill with snow and become dammed in the winter. Lakes are filled during the summer melt season until the moulins are reopened by a combination of imperativeness and melting (Box Ski, 2007). respite propagation through the ice suggests that once initiated water filled crevasses will propagate napwardly through the full thickness of the ice through a process called hydrofracture (Das et al., 2008). The water ponds above small crevasses in the lake basin, exerting stress on the crevasse and finally the ice starts to fracture. Initially the water refreezes in the crevasse. Heat created from refreezing warms the ice and it melts, progress further down into the crevasse. Once a connection with the bed is launch water from the lake can freely drain. There is no limit to the depth of a water filled crevasse so it is able to reach the bed of a glacier. The process is only limited by the supply of melt water needed to keep the crevasse full (Weertman, J. 1973). Crevasses and moulins connect the surface of the ice sheet with englacial environments, providing a route for melt water to drain from the supraglacial lakes through the ice sheet (Chu, 2014).Although only lake drainage processes for two lakes were observed by Das et al. (2008) in this particular study it can be faux that early(a) lakes on the Greenland ice sheet drain in the same way. The presence of fractures in other empty lake basins suggests that drainage processes are convertible for all supraglacial lakes (Das et al., 2008).Throughout melt season, drainage patterns of the lakes across the Greenland ice sheet migrate inland. Lakes at lower elevations tend to form and drain in the beginning than those at higher elevations (Bartholomaus et al., 2007).Ice Sheet DynamicsRapid drainage events are of particular interest in understanding ice sheet dynamics and hydraulic response. Fluctuations in surface water are known to affect the speed of ice sheets (Sundal et al., 2011). Some suggest that more influx of melt water to the glacier bed, from lake drainage events could produce ice sheet acceleration. Moulins submit a method of rapid lake drainage, supplying large influxes of water to the glacier bed with the potential to overwhelm the subglacial hydrological system causing uplift and make up basal sliding (Chu, 2014). They can only support a fraction of the lake water, retentivity water jam at the base of the glacier high and encouraging join ons in basal movement and uplift (Box Ski, 2007). Higher water push favours fast sliding as it reduces drag between ice and the bed (Bartholomew et al., 2012). urge ups of the ice sheet are caused by an increase of water pressure at the its base, enhancing basal sliding. This increase in basal water pressure can be provided by melt lake outbursts (Box Ski, 2007). There are other processes involved in basal sliding but for the purposes of linking it with glacier hydrology we are only interested in cavitation. Cavitation vertically jacks the glacier upwards, reducing friction between the glacier bed and rock interface and decreasing effective pressure. When effective pressure and friction are low basal sliding rates are high. In the same study as mentioned above, Das et al. (2008) observed horizontal and vertical movement of the ice sheet that coincided with rapid drainage of the lake.A large steep block of ice in the centre of the lake basin evidences local uplift of the ice sheet during rapid lake drainage. Based on topographic studies, it is likely that the large block in the centre of the lake was uplifted during a drainage event (Das et al., 2008). The elevation change reported by sonar surveys suggests surface uplift of around 6m across the block. The large people of water transported to the ice sheet bed during lake drainage would have produced some(prenominal) meters of uplift at the lakes centre (Das et al., 2008).Figure 2, produced from a study by Bartholomew et al., (2012) supports Das et al., (2008) conclusion that drainage of supraglacial lakes can affect velocity and uplift the ice sheet. It shows rapid increases in ice velocity and surface bloom after the drainage of a supraglacial lake observed on the Western transect of the Greenland ice sheet. Drainage of the lake can be linked with a 400% increase in ice velocity and 0.3m of uplift in less than 24 hours (Bartholomew et al., 2012).Figure 2 (a) place velocity during lake drainage event (b) Surface height profile during the lake drainage event (c d) Before and after images of th e supraglacial lake (taken by time lapse camera). Solid black lines on (a b) indicate the generation when the two photos were taken.Taken from Bartholomew, I., Nienow, P., Sole, A., Mair, D., Cowton, T. and King, M. (2012). Short term variability in Greenland Ice Sheet dubiousness forced by time-varying meltwater drainage Implications for the relationship between subglacial drainage system behaviour and ice velocity. daybook of Geophysical Researcg, 117(F3).both outlet glaciers and slower moving ice sheets across Greenland show a seasonal speed up in response to enhanced melt water delivery to the glacier bed and from pulses of water from lake drainage. The ice sheets continue to speed up until a maximum velocity threshold is reached sequentially the glacier slows down (Chu, 2014). This slowing down of the glacier is not to be expected if lubrication by melt water is the primary mechanism of speeding up the ice sheet. The decline in velocity suggests subglacial drainage switch es from a linked cavity system to a more efficient channel drainage system (Chu, 2014). resultantUnderstanding the hydrology of supraglacial lakes is important as they have the potential to supply large volumes of water to the bed of the ice sheet and affect motion. Both an increase in glacier velocity and local uplift is observed when supraglacial lake water drains to the bed of the glacier. However, constant high influxes of water are not consistent with go along increase in velocity because the subglacial drainage system switches to a more efficient system (Bartholomaus et al., 2007). Large pulses of water delivered to the bed from drainage of supraglacial lakes overwhelm the subglacial hydrologic network and increase basal motion. Moulins provide rapid drainage of large supraglacial lakes into the ice sheet hydrological systems, while crevasses provide a more rigid drainage method. The location, area and potential melt water available to fill these supraglacial lakes is contro lled by the elevation and topography of the surrounding area, and more importantly temperature. In turn, these factors could be controlled by climate change. For this reason it is important to monitor the processes associated with glacial lakes to get under ones skin a clearer understanding of the impacts any future climate change will have on glacial lakes and the Greenland ice sheet.ReferencesAbdalati, W. and Steffen, K. (2001). 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