lap lambert academic publishing mrz 2012 (Oltre 1.200 risultati)

Taschenbuch. Condizione: Neu. Neuware -Tablets are solid unit dosage form of medicaments with or without suitable diluents and prepared either by molding or compression. They are solid, flat or biconvex disc in shape. They vary greatly in shape, size and weight which depend upon amount of medicament used and mode of administration. They also vary in hardness, thickness, disintegration and dissolution characteristics and in other aspects depending upon their intended use and method of manufacture. Tablets are the most widely used solid dosage form of medicament. Because of their advantages their popularity is continuously increasing day by day. Hypertension is a very common disorder, particularly past middle age. It is not a disease in itself, but it is an important risk factor for cardiovascular mortality and morbidity. The WHO-ISH guidelines defined it to 140 mm Hg systolic and 90 mm Hg diastolic, through risk appears to increase even above 120/90 mm Hg. 100 pp. Englisch.

Taschenbuch. Condizione: Neu. This item is printed on demand - it takes 3-4 days longer - Neuware -The gender gap has been one of the major challenges of the education sector particularly in developing countries. As part of the developing countries Ethiopia also experiences this challenge in the education sector. Although many books have been written about the gender gap in education in Ethiopia, Most of the available literatures seem to present as if the gender gap in schools is always in favor of male students. This study has two Purposes: First to compare the gender gap across different types of schools in Addis Ababa and analyze the socio-economic conditions that contribute to such gender gap in different types of schools. Second the study examines the relationship of students socio-economic background and their performance in schools. According to the findings of the study, the gender gap in performance in schools is a reflection of the socio-economic background of students. This book will be valuable asset for students and those who are interested in the education and development related issues and make further research in the field. 80 pp. Englisch.

Taschenbuch. Condizione: Neu. This item is printed on demand - it takes 3-4 days longer - Neuware -Like other developing countries, in South and South-East Asia, infant and child mortality has been given paramount importance by both academicians and policy makers. This is because this mortality is comparatively high here. This book illustrates infant and child mortality and factors affecting it in the context of different programmes and policies implemented by various conutries of the region. Also the book compares intra-country and inter-country comparisons of infant and child mortality levels. The book extensively discusses various child health programmes and their effects on infant and child mortality from 1970 to 2006. In addition to that the book also discusses various aspects of demographic, socio-economic and cultural practices that significantly affect infant and child mortality in this region. The book is of immense use in studies related to demography and public health. 116 pp. Englisch.

Taschenbuch. Condizione: Neu. This item is printed on demand - it takes 3-4 days longer - Neuware -The closed borders between Armenia and Turkey date back to 1993. In 2009, the two states signed the Protocols for establishing diplomatic relations in an attempt at reconciliation. The delay of ratification, ever since the signature of the documents, has pushed many to consider the Protocols as dead . The Turkish parliament, on the other hand, claimed otherwise by reintroducing the Protocols into the agenda of the new legislature in September 2011. Throughout the past three years, similar fluctuations in approach and assessment have characterized the political processing of the documents. This monograph treats the Protocols as an ongoing process and analyzes the documents at two different junctures: first in the context of their introduction, and then regarding their significance today. The study reveals the attempt of both states to sideline their long-standing principled oppositions in exchange for a more pragmatic approach. The politico-legal analysis of the Protocols reveals the challenges and the prospects of pragmatism in the Armenian-Turkish context. 100 pp. Englisch.

Taschenbuch. Condizione: Neu. This item is printed on demand - it takes 3-4 days longer - Neuware -We analyse the Singapore foreign exchange market from a microstructure approach. Specifically, by modifying and applying the empirical methodology designed by Bollerslev and Melvin (1994), we examine the relationship between bid-ask spreads and the underlying volatility of the USD/SGD. Our data set comprises high-frequency USD/SGD tick data of three separate periods (April-June 1989, April-May 2006, April-May 2009). We found that for the USD/SGD: i) the size of bid-ask spreads are positively related to the underlying exchange rate volatility; ii) the magnitude of the dependence on underlying volatility increases as tick volume increases; and iii) the size of the bid-ask spreads may also be positively related to the directional movement of exchange rates. This book is originally a thesis submitted by the author to the Singapore Management University School of Economics in partial fulfillment of the requirements for the Degree of Master of Science in Economics. 112 pp. Englisch.

Taschenbuch. Condizione: Neu. This item is printed on demand - it takes 3-4 days longer - Neuware -Recent years have witnessed a growing interest in the topic of European Identity, both on a discursive and on a practical level. Despite the ambiguity of the concept, in view of the continuous enlargement and changing borders of the European Union, identity started being perceived as a possible solution towards peace keeping, successful implementation of politics and achievement of the kind of unity necessary for holding Europe together. The present study looks into the possibilities of becoming European by an extensive study of one of the most popular top-down initiatives of the European Union, the European Capitals of Culture Programme. 'You can't fall in love with the common market' Jacques Delors said to point that while free trade is necessary,it is definitely not sufficient. While there can be no denial to the possibility of falling for a grandiose project like the one discussed in the book, it remains to be seen in how far such a programme manages to instill the desired feeling of Europeaness. 80 pp. Englisch.

Taschenbuch. Condizione: Neu. This item is printed on demand - it takes 3-4 days longer - Neuware -In this book in addition to introduce Mock theta functions of order three,five and seven,The convergence of mock theta functions of order three, five and seven to an irrational number at an infinite points is discussed.more over the Irrationality behavior of four of the Ramanujan s infinite series,and three of the G.N Watson Mock theta functions of order three at infinite points is also discussed. The applications Mock Theta function in Connection with characters of infinite dimensional Lie super algebras and conformal field theory is also introduced. 56 pp. Englisch.

Taschenbuch. Condizione: Neu. This item is printed on demand - it takes 3-4 days longer - Neuware -Deep Brain Stimulation (DBS) has resulted in a renaissance as an alternative way for treatment of parkinson's disease and essential tremor. Deep brain stimulation employ the use of high electric field to stimulate some brain centers. The final position of the electrodes in the brain is specified by the aid of CT and MRI scans for the patient's head before and after the operation. A study of electric field distribution in the brain is required to interpret and improve the action of DBS. In this master thesis project, Voreen was extended to visualize a multimodal volume of the CT and MR images. The MR volume was segmented to extract the brain from the skull in T1 weighted images. Some image processing techniques were developed to enhance the contrast of CT and MR images. In order to stimulate electric field in the brain, the neurologists are allowed to design and position the electrodes in the reconstructed volume. The electrodes and some pre-modeled electric fields can be visualized in the reconstructed volume and the slice views. A mesh generator was developed using delaunay tetrahedralization. 60 pp. Englisch.

Taschenbuch. Condizione: Neu. This item is printed on demand - it takes 3-4 days longer - Neuware -The purpose of this project is to design a low noise amplifier (LNA) for a radio telescope. The LNA is an electronic amplifier used in communication systems to amplify extremely weak signals captured by antennae. This thesis describes the procedure of designing an LNA for 7 GHz frequency. Noise matching is an important technique which was considered in the design process. The designed LNA achieved a gain of 30 dB with 1 GHz bandwidth. The noise figure achieved was less than 2.9 dB. Return-losses were improved by 6 dB with a new proposed optimization method. 92 pp. Englisch.

Taschenbuch. Condizione: Neu. This item is printed on demand - it takes 3-4 days longer - Neuware -Effective communication between nurses and physicians is essential in providing safe and effective care. Even if high-quality patient care is the goal of medicine and nursing, patients are dying and experiencing preventable complications because of poor nurse physician relationship. The main objective of this work was to assess perception of nurses & physicians towards barriers to nurse-physician communication and its impact on patients outcome at Hawassa University referral hospital. An institution based cross sectional study was carried out and included nurses and physicians who were working at Hawassa University referral hospital. Both nurses and physicians participated in the study have perceived that effective nurse-physician communication have positive impact on patient outcomes. Negative correlations were also existed between factors affecting nurse physician communication and patient outcomes. On the other hand nurses were not satisfied with their relation with physicians where as physicians were relatively satisfied with their relation with nurses. 52 pp. Englisch.

Taschenbuch. Condizione: Neu. This item is printed on demand - it takes 3-4 days longer - Neuware -Intrusion detection system is a vital part of computer security system commonly used for precaution and detection. It is built for classifier or descriptive or predictive model to proficient classification of normal behavior from abnormal behavior of IP packets. This book presents the solution regarding proper data transformation methods handling and importance of data analysis of complete data set which is apply on hybrid neural network approaches for used to cluster and classify normal and abnormal behavior to improve the accuracy of network based anomaly detection classifier. Because neural network classes only require the numerical form of data but IP connections or packets of network have some symbolic features which are difficult to handle without the proper data transformation analysis. For this reason, it got non redundant new NSL KDD CUP data set. The experimental results show that indicator variable is more effective as compared to the both conditional probabilities and arbitrary assignment method from measurement of accuracy and balance error rate. 108 pp. Englisch.

Taschenbuch. Condizione: Neu. This item is printed on demand - it takes 3-4 days longer - Neuware -The book deals with Wavelet Multifractal Analysis of Functions especially those representing some type of self similarity. These constitute nowadays a very popular subject of study in theoretical mathematics, physics as well as applied fields such as biology, finance, etc. This makes their understanding is of great interest for researchers as well as professionals. This book will be an important reference especially for young researchers as well as for applied ones especially physicists, biologists, bankers, and financials. We recall with details the mathematics notions related to the subject such as Hausdorff measure and dimension, self similar sets and the role of the self similarity in the computation of their sizes. Next, we recall the basics of wavelet theory, self similar type functions and the validity of the multifractal formalism and its relation to the self similar structure. Some examples are also recalled with exact computations. 64 pp. Englisch.

Taschenbuch. Condizione: Neu. This item is printed on demand - it takes 3-4 days longer - Neuware -Glass fibre-reinforced polymer have been used as an alternative to steel in concrete due to high strength-to-weight ratio, high stiffness-to-weight ratio, and corrosion and fatigue resistance. The main environmental factors for the deterioration of GFRP sandwich composites are temperature, sunshine, water/moisture, alkalinity and load. In this an experimental investigation has been carried out to study combined effect of chosen parameters moisture and temperature & also to study the rate & magnitude of damage of GFRP sandwich structure composites under hygrothermal loading conditions. The sandwich structure composed of E-glass fibre, polystyrene (thermocol core) and epoxy resin were subjected to three point bending test to assess bending strength. Two thermocol cores with different thickness (8mm and 16mm) were investigated. It has been observed that the sandwich structure with higher core thickness withstand a higher bending load show less flexural stress and flexure modulus when compared with low core thickness. Higher percent bending pre-loads lead to higher degradation in maximum flexure load as well as flexure modulus and flexure stress. 112 pp. Englisch.

Taschenbuch. Condizione: Neu. This item is printed on demand - it takes 3-4 days longer - Neuware -The review study of Role of ICTs in Translating Health System Objectives into Outcomes: Concept, Priorities, Challenges and Future Directions is an important piece of work to improve Health Care Quality'. The study highlights plaguing health problems & strategic promotion of cross cutting information communication technologies (ICT) in health care. Strategic positioning of ICTs is necessary, as informed decision is essential at local, district, state and national levels for health policy makers, managers, implementers. ICTs may play pivotal role in structuring, facilitating data collection, interpretation, decision and prioritization especially in resource limited settings such as developing countries.This study brings out the a) Conceptual framework of ICTs- health sector nexus in appropriate decisions; b)Shows the promise from different evidences (success stories); c) Identifies the key challenges and; d) proposes possible solutions. The study further pitches to bring clarity on how ICTs can play role to develop sustainable appropriate tool by which the problems can be managed, shaped and strengthened to improve overall health care quality from developing country context. 104 pp. Englisch.

Taschenbuch. Condizione: Neu. This item is printed on demand - it takes 3-4 days longer - Neuware -This monograph presents results of investigations on fields and multipole expansion coefficients in axially symmetric (referred to as 3D) and two dimensional (2D) ion trap mass analysers. 3D mass analysers have a three-electrode geometry with two (electrically shorted) endcap electrodes and one central ring electrode. rf-only or rf/dc potential applied across the electrodes creates a linear trapping field in the central cavity of the mass analyser. 2D mass analysers have four longitudinal electrodes in which the opposite pairs of electrodes are electrically shorted. Here, rf-only or rf/dc potential applied across the pair of electrodes creates a linear trapping field and fragment ions of the analyte gas are trapped along the central axis of the mass analyser. Both these mass analysers have apertures machined on the electrodes (holes in case of 3D traps and slits in case of 2D traps) to permit entry of electrons for ionising the analyte gas and for collection of destabilized fragment ions. This thesis is concerned with how these apertures influence the fields and multipole expansion coefficients within the traps. This thesis is divided into five chapters. 116 pp. Englisch.

Taschenbuch. Condizione: Neu. This item is printed on demand - it takes 3-4 days longer - Neuware -In this thesis we address certain questions arising in the functional analytic study of dynamical systems and differential equations. First, we discuss the operator theoretic counterparts of the central ergodic theoretical notions of strong and weak mixing. These concepts correspond to particular types of asymptotic behaviour of operator semigroups in the weak operator topology. In particular, we carry over classical theorems of Halmos and Rohlin for measure preserving transformations to the Hilbert space operator setting. Further, we illustrate operator semigroup methods and results on a class of telegraph systems with various boundary conditions. We study both linear and nonlinear boundary value problems. The stability of linear telegraph systems is discussed by applying theorems from the previous chapters. For the existence of solutions, we are particularly interested in time-dependent boundary conditions, since this case has little been investigated so far. 84 pp. Englisch.

Taschenbuch. Condizione: Neu. This item is printed on demand - it takes 3-4 days longer - Neuware -In classifying large data set, efficiency and scalability are main issues. Advantages of neural networks include their high tolerance to noisy data, as well as their ability to classify patterns on which they have not been trained. Neural networks are a good choice for most classification and prediction tasks. The necessary complexity of neural networks is one of the most interesting problems in the research. One of the challenges in training MLP is in optimizing weight changes. Advances are introduced in traditional Back Propagation (BP) algorithm, to overcome its limitations. One method is to hybrid GA with BP to optimize weight changes.The objective here is to develop a data classification algorithm that will be used as a general-purpose classifier. To classify any database first, it is required to train the model. The proposed training algorithm used here is a Hybrid BP-GA. After successful training user can give unlabeled data to classify. 56 pp. Englisch.

Taschenbuch. Condizione: Neu. This item is printed on demand - it takes 3-4 days longer - Neuware -Wireless Sensor Networks (WSN) are difficult to deploy. Limited energy, bandwidth, hardware and lack of security make WSN implementation difficult. Conventional security mechanisms cannot be applied because of the inherent processing and communicational constraints that exist in WSN. This book focuses on the design, implementation and analysis of an Optimized Security Protocol (OSP) that fulfills the requirements of confidentiality, authentication and integrity in WSN. OSP fulfils requirements of high level security without compromising resources. OSP architecture is based on the further optimization of computations in the Rabbit stream cipher and reduction in communication overhead to save sensor s life time. The OSP has been implemented using power of TinyOS coupled with NesC. In order to evaluate the system, several experiments have been carried out with respect to encryption/ decryption of various data blocks. Evaluation of OSP has been done by conducting a comprehensive efficiency analysis of the OSP architecture. Furthermore, the results of execution time and memory footprint for OSP have been compared to its cryptographic counterparts. 80 pp. Englisch.

Taschenbuch. Condizione: Neu. This item is printed on demand - it takes 3-4 days longer - Neuware -Membrane bioreactor is an innovative technology for Wastewater treatment. The book provides in-depth understanding of Membrane Bioreactor technology for wastewater treatment and reuse. The objective of the research was to mitigate fouling in membrane bioreactors using biofilm carriers; Sponge was used as moving media. Background theory is discussed in Chapter 1 which provides the research objectives achieved. Chapter 2 provides basic insight of the MBR technology, membrane fouling mechanism, factors and mitigation approaches. Chapter 3 provides the detailed methodology applied to achieve research objectives, the protocols followed to determine parameters pertinent to MBR performance and operation. Chapter 4 provides the results obtained. Chapter 5 provides the conclusions drawn and recommendations for further study. This book is a useful tool for students and professionals having interest in Membrane Bioreactor and wastewater treatment. 72 pp. Englisch.

Taschenbuch. Condizione: Neu. This item is printed on demand - it takes 3-4 days longer - Neuware -Explore the variable speed operation and shift response of a prototype of a continuously variable rotorcraft propulsion system and development of a Comprehensive Variable Speed Rotorcraft Propulsion system Modeling (CVSRPM) tool.Simulate the drive system dynamics in steady forward speed condition in an attempt to build upon previous variable speed rotorcraft propulsion studies by including, fully nonlinear first principles based transient gas-turbine engine model with shaft flexibility and incorporating a basic flight dynamics model to account for interactions with the flight control system. Explore the interactions between the various subsystems and obtain insight into the continuing development of variable speed rotorcraft propulsion systems and a study of various variable ratio transmissions that have already been explored. 112 pp. Englisch.

Taschenbuch. Condizione: Neu. This item is printed on demand - it takes 3-4 days longer - Neuware -This book discusses the fluoride removal potential and mechanism of Nano scale-AlOOH. Fluoride generates effects on skeletal tissues. Elevated levels of fluoride (1.5 mg/L) in drinking water supply resulting dental and skeletal fluorosis in the affected people. So far, studies explored the efficiency of various substances as adsorbents for the removal of fluoride from water. Currently, nanotechnology has developed quickly in various fields over the past decade, and has been growing interest in the application of nano particles as sorbents for fluoride. Thus compared with the traditional micron-sized materials used for separation processes, nano-sized carriers possess a good performance due to the high surface-area to volume ratio and the absence of internal diffusion resistance. Thus, the nano adsorbents with higher specific surface area have superior adsorption capacity, and nano-AlOOH has strong affinity for fluoride and high adsorption capacity. The book is addressed in particular to scientists concerned with research control in connection with water pollution; and a meant for students and researchers from disciplines of chemistry, Environmental science and related disciplines. 96 pp. Englisch.

Taschenbuch. Condizione: Neu. This item is printed on demand - it takes 3-4 days longer - Neuware -The success of software development projects depends highly on meeting the assigned schedule and budget of the project which are often defined in terms of a project plan. Estimation is the basis for planning; therefore, having a reliable way of estimating effort needed to perform the tasks is a must for a reliable project plan. Already in 1987, Samson, Nevill and Dugard, showed that there is a strong and direct influence of formal specification metrics onto the effort needed for implementation. Since then, there has been some progress in various aspects of formal specifications; the introduction of specification slicing methods, slice-based specification metrics, and methods for visualization of specifications has opened new ways for measuring properties of specifications with more metrics. Nevertheless, there hasn t been much progress in the field of cost estimation using recent achievements of formal specifications. The main focus in this work is to examine if there is a correlation between formal Z specification measures and implementation related measures. In concise, this work tries to explain the correlation between the measures in specifications and code. 56 pp. Englisch.

Taschenbuch. Condizione: Neu. This item is printed on demand - it takes 3-4 days longer - Neuware -Information technology has contributed significantly to economic growth; but its enormous impact on creating a green economy has been ignored. Recently, the term of Green IT has become a topic of constant debate and has been discussed extensively in both academic researches and practitioner reports. However, due to its newness, research on this issue has been limited. At a time when it is becoming more evident that Information Technology has an increasingly significant role to play in creating a green economy and enforcing sustainable development, this research stream assists in understanding the adoption and effective implementation of Green IT practices in organizations. This book is also seeking to provide a preliminary insight on the status of Green IT adoption as well as some of the underlying factors that influence it. Governments are seen as the most powerful propulsion for Green investments. However, there are many other variables including technological, environmental and organizational factors that can contribute to successful adoption and implementation of new Green initiatives. 108 pp. Englisch.

Taschenbuch. Condizione: Neu. This item is printed on demand - it takes 3-4 days longer - Neuware -Lots of soil s geotechnical characteristics involved in the construction problems. Soil will eventually reach failure and deforming excessively when it is subjected to gradually increasing load. This failure is related to the shear strength which is considered as one of the most important engineering properties of the soil. This research focused on comparison of effective shear strength parameters (c', ') that obtained from both Consolidated Undrain (CU) and Consolidated Drain(CD) triaxial tests for remoulded residual soil (silt). This study presents a reduction factor that helps to evaluate the effective internal friction angle of CD test from the results of CU triaxial test. The reduction factor is in the range of 0.89 to 0.92 that came as a result of this study to samples of residual soil with different initial water content. The initial water content had an influence in triaxial compression testing on the soil strength; soil effective cohesion became higher in the range of (11% up to 29 %) when initial water content changed from 53% to 43%, and soil effective friction angle would increase by (3% up to 6%). 108 pp. Englisch.

Taschenbuch. Condizione: Neu. This item is printed on demand - it takes 3-4 days longer - Neuware -Divide and Conquer is a well known algorithmic procedure for solving closest pair problems.In this procedure, the problem is partitioned into two parts until the problem is trivially solvable. It is theoretically and practically observed that sometimes partitioning the problem space into more than two parts can give better performances. In this work we proposed that dividing the problem space into (n) number of parts can give better result.We organized the book as follows,in Chapter 2, we discussed Divide-and-Conquer algorithm and Closest-Pair problem. In Chapter 3, we reviewed previous works about Divide-and- Conquer algorithm to solve Closest-Pair problem. In Chapter 4, we present detailed version of the Basic-2 algorithm and give the correspondent proof of correctness as presented by Jos e C. Pereira & Fernando G. Lobo (2010). In Chapter 5, some previous proofs are given where is proven that 2-ary system is not the best choice for all the algorithms. The results in this chapter are based on [Kayk98]. In Chapter 6, a new procedure of divide and conquer rule is presented to solve the closest pair of points problem. In Chapter 7, we discussed future work and conclude our work. 76 pp. Englisch.

Taschenbuch. Condizione: Neu. This item is printed on demand - it takes 3-4 days longer - Neuware -DCarS is a driving rules and regulations training program designed for use on handheld devices. This thesis presents DCarS (Drive Car Safely), a software product developed to help pre-permit, permit and licensed drivers increase or refresh their knowledge, skills, abilities and attitudes necessary for driving safely. DCarS can be installed on handheld devices such as mobile phones or PDAs and used anytime and anywhere. DCarS helps the user to learn basic and important driving rules, traffic signs and state laws. The software includes questions and tests which verify the user s knowledge of the subjects and can store the results for future assessments. This thesis also describes the operating principles of DCarS and presents details of the software specification, design, and prototype implementation. It also includes a brief comparison with related approaches and suggests directions of future work. 88 pp. Englisch.

Taschenbuch. Condizione: Neu. This item is printed on demand - it takes 3-4 days longer - Neuware -A rapidly growing population and poorly performing irrigation distribution system have led to increase water shortages. Under these conditions the use of untreated waste water for irrigation of vegetables is a common practice. This study was carried out to assess levels of toxic metals Pb, Ni, Fe and Li in Gandha Nala water of Lahore and their uptake in treated Cabbage. The main objective of this study was to look the effect of contaminated water on morphological and physiological parameters of Cabbage plant. For this purpose Cabbage plants were treated with two concentration 30% and 100% of Gandha Nala water. This treatment was continued for one month. The concentrations of Pb and Ni were found on dry matter basis and were above the recommended maximum acceptable levels proposed by Indian Standard (Awasthi 2000) and Commission regulation (EU 2006). Highest metal contents were observed in leaves which indicate that leafy vegetables should be consumed carefully if produced using untreated waste water. 88 pp. Englisch.

Taschenbuch. Condizione: Neu. This item is printed on demand - it takes 3-4 days longer - Neuware -The Internet Group Management Protocol (IGMP) is an Internet protocol that provides a way for an Internet computer to report its multicast group membership to adjacent routers. Multicasting allows one computer on the Internet to send content to multiple other computers that have identified themselves as interested in receiving the originating computer's content. Multicasting can be used for such applications as updating the address books of mobile computer users in the field, sending out company newsletters to a distribution list, and 'broadcasting' high-bandwidth programs of streaming media to an audience that has 'tuned in' by setting up a multicast group membership. The architecture allows secure, efficient and reliable delivery of content to a large group of receivers. 60 pp. Englisch.

Taschenbuch. Condizione: Neu. This item is printed on demand - it takes 3-4 days longer - Neuware -The book entitled 'Naturally occurring alkaloids and iridoids: Chemistry and biological importance' contains the overview about the bio-active alkaloids and iridoids. Since, these class of natural products having significant medicinal values, so the complete chemistry including biosynthesis and the structure elucidation on the basis of advanced NMR techniques has been discussed in brief. The isolation techniques for these constituents are being highly emphasized. Their role in the plants and animals and detailed classification are also included in the text. This is a reference book which contains more than 300 references. The book is a summary of various significant researches and other contributions in the form of reviews and books, and the source of the facts discussed in the book are being cited in the text. The matter of this book would be helpful for postgraduate students as well as researcher working in the field of natural products chemistry. 92 pp. Englisch.

Taschenbuch. Condizione: Neu. This item is printed on demand - it takes 3-4 days longer - Neuware -Fuel cell is an emerging area in the field of renewable alternate energy sources. The operation of a fuel cell involves fluid flow, heat transfer, mass transfer processes and the electrochemical reaction. All the above processes are coupled and they take place in a small region of space making the system complex. The performance of a fuel cell can be studied by experiments and numerical modeling. In the present project, an attempt is made to mathematically model the performance of a Polymer Electrolyte Membrane (PEM) fuel cell using lumped and control volume approach. The various processes that take place inside the gas diffusion layer of anode and cathode, catalyst and membrane of the fuel cell are represented using governing equations based on the mass and energy conservation principles and electrochemical reactions. The equation that is used to represent the diffusion phenomena in the GDL is solved using the Finite Difference Method. The present model is capable of predicting the performance of the PEM fuel cell in close agreement with numerical model based on CFD approach with a maximum of 30% error. 80 pp. Englisch.