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1000 tulosta hakusanalla J.A. Wainwright
Electromagnetic Modelling of Power Electronic Converters
J.A. Ferreira
Springer-Verlag New York Inc.
2010
nidottu
The era of the personal computer has, without doubt, permanently altered our life style in a myriad of ways. The "brain" of the personal computer is the microprocessor (together with RAM and ROM) which makes the decisions needed for the computer to perform in the desired manner. The microprocessor continues to evolve as increasingly complex tasks are required. While not sharing the limelight of the microprocessor, the "heart" of the personal computer, namely the power supply, is equally important since without the necessary source of power the microprocessor would be a useless piece of silicon. The power supply of twenty years ago was much different than its modem day equivalent. At the dawn of the personal computer era in the late 1970s, de power was obtained from a simple diode bridge. However, the need for smooth, regulated DC at low voltage required at the same time both a bulky input transformer and a large dc side ftlter. Those computer fans present at the birth of this industry can remember the large boxes housing our Altair, Cromemco and Northstar computers which was made necessary largely because of the huge power supply. It is not well appreciated but certainly true that the huge sucess of the Apple II computer in those days was due, at least in part, to the relatively slim proftle of the machine. This sleek appearance was largely due to the adoption of the then new and unproven switched mode power supply.
The world has changed drastically over the past decade. The Internet has had a huge part in that, as it has made the world more accessible to anyone of any age, race, or gender. Used for entertainment, education, shopping, dating and more, the internet has provided a whole new virtual world for everyone to enjoy. But with the good also comes the bad—and for kids and teens these days, the bad has becomes a constant threat from cyberbullies and cyberstalking. J. A. Hitchcock began to have an interest in cyberstalking and cyberbullies in 1996 when she blew the whistle on a literary agency scam. They stole her identity and began posting messages online pretending to be her; and that was only the beginning of a barrage of threats. When she contacted local police they had never had an internet-related case and couldn’t help her, so she taught herself how to track down online criminals, how to handle the situation, and how to stay safer online. After 10 years of being a victim, her cyberstalkers were brought to justice. Unfortunately, not all internet crime stories end with a happy ending. Really, anyone of any age can become the target of a cyberbully. And quite honestly, victims are getting younger and younger every year when it comes to being cyberbullied. Throughout Cyberbullying and the Wild, Wild Web, Hitchcock explains how someone can become victim to cyberbullying and how they can stay safer online. Offering victims, and parents, the chance to be able to relate to and truly understand the unfortunate reality of cyberbullying through real-life examples of what happened to someone who had been through a similar situation. For much-needed practical advice, from an expert who truly understands the threat of cybercrime, this is a must-have resource to combat the ever-growing problem of internet crime in our society.
Using the latest mapping techniques, J.A.A. Jones, Chair of the IGU Commission for Water Sustainability, examines water availability, the impact of climate change and the problems created for water management worldwide as well as possible solutions.Water Sustainability: A Global Perspective is one of the first textbook to meld the physical and human aspects affecting the world's water resources. Part One outlines the challenges and investigates the human factors: population growth; urbanization and pollution; the commercialization of water, including globalization and privatization; and the impacts of war, terrorism and the credit crunch. Part Two examines the physical aspects: the restless water cycle, the impact of past and future climate change and the problems change and unreliability create for water management. Part Three discusses current and future solutions including improved efficiency and water treatment systems, desalination, weather modification and rainwater harvesting, and improved legal and administrative frameworks. Jones concludes by asking how far technical and financial innovations can overcome the limitations of climatic resources and examining the human and environmental costs involved in such developments.This book is the ideal text for any student of water sustainability whether approaching the subject from the point of view of international relations, geography or environmental management.
Matched Asymptotic Expansions in Reaction-Diffusion Theory
J.A. Leach; D.J. Needham
Springer London Ltd
2012
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This volume contains a wealth of results and methodologies applicable to a wide range of problems arising in reaction-diffusion theory. It can be viewed both as a handbook, and as a detailed description of the methodology. The authors present new methods based on matched asymptotic expansions.
If I have seen further, it is by standing on ye shoulders of giants. Sir Isaac Newton (1675) Although congenital displacement of the hip has always been recognised as the commonest pre-natal deformity of the musculoskeletal system found in otherwise normal children, it is surprising to find that much of our present-day understanding concerning its origin and nature has been discovered only in the past 150 years and its successful management eventu ally emerged during the last 60 years, almost within the professional life time of our more senior colleagues. Whereas Hippocrates (460-370 B. C. ) appeared to recognise patients that had experienced dislocation of their hips in utero and identified them from acquired forms of displacement, according to Severin (1941) it was another 2000 years before Palleta (1820) first recorded a careful description of the deformity based on his observations at an autopsy performed on an II-day-old boy with bilateral dislocations; he concluded that the findings were not caused by injury at birth, but dated from a pre-natal stage. Soon after, Baron Dupuytren (1847) gave an accurate description of congenital dislocation in his contribution entitled "Memoire sur un deplacement original ou congenital de la tete des femurs". He noted the absence of abscesses and fistulae as seen in painful and cruel pathological dislocations, which led him to believe that these congenital displacements were not likely to be the result of foetal disease as the affected babies appeared quite healthy at birth.
Rheumatology in Practice offers chapters which are organised and built around anatomical and regional syndromes, so reinforcing the evidence-based approach. As readers progress through the text they are given more demanding and challenging questions, encouraging them to use their diagnostic skills to identify the main syndromes and the underlying diseases responsible for the disorders in question. The text is lavishly illustrated in full colour, with detailed photos of patient examinations, complemented by radiographs and full colour line illustrations. The text also benefits from the use of summaries using coloured boxing to identify key points in diagnosis and management. Written by two of the most respected clinicians in the discipline, this book will be essential reading for rheumatologists in practice and training.
