| |
|
|
Free Ebooks DownloadWelcome to DL4ALL.org – your ultimate destination for ebooks across every genre. Whether you’re into fiction, self-help, education, or niche topics, we offer an extensive library to satisfy your thirst for knowledge and entertainment. Why Choose DL4ALL.org?
Start your reading journey today on DL4ALL.org and unlock a world of imagination, knowledge, and inspiration!  Free Download Electromagnetic Modelling of Power Electronic Converters by J. A. Ferreira English | PDF | 1989 | 177 Pages | ISBN : 0792390342 | 11.4 MB 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.  Free Download Electromagnetic Induction Phenomena by David Schieber English | PDF | 1986 | 307 Pages | ISBN : 3642710174 | 18.3 MB From an engineering perspective, Electrodynamics is the province of two cul tures. The most easily identified of the two is primarily concerned with phe nomena in which the propagation of electromagnetic waves is crucial. Includ ed are the designers of microwave circuits, of antennae and of many-wave length communication channels. The interests of the second group focus on dynamical processes associated with the evolution of field sources, whether these be electrons and holes migrating in a semiconductor, or currents diffus ing in a moving metal. Because the second culture is primarily concerned with the interaction be tween electromagnetic fields and media, where the latter are often responsible for the dominant dynamical processes, it addresses applications that are more widely ranging. A few from a very long list would include electrostatic print ing, rotating machines, power transmission apparatus, the electromagnetics of biological systems and physical electronics. Whether by nature or by de sign, the phenomena of interest are generally electro quasi static or magneto quasistatic in this second branch of electrodynamics. It is tempting to say that the two branches of electrodynamics can be distinguished by the frequency range, but electron-beam and microwave-magnetic devices, with their respec tive plasma oscillations and spin waves, are examples where the frequencies can be in the GHz range while the fundamental interactions are quasistatic. By design, so also are those that determine the frequency response of a transistor.  Free Download Electromagnetic Applications by Carlos A. Brebbia English | PDF | 1989 | 245 Pages | ISBN : 3642836828 | 24.3 MB General Applications of BEM to electromagnetic problems are comparatively new although the method is ideally suited to solve these problems, which usually involve unbounded domains. The present volume comprises contributions by eminent researchers working on applications of boundary elements in electromagnetic problems. The volume deals with the solutions of Maxwell's equation for three-dimensional as well as two-dimensional cases. It also discusses combination of BEM with FEM particularly in the case of saturated media. Some chapters specifically deal with the design of electromagnetic devices. The book is essential reading to those engineers and scientists, who are interested in the state of the art for electrical and electromagnetic application of boundary elements. It is also an important reference for those engineers who are working on the design of electromagnetic components many of which can be advantageously carried out using BEM.  Free Download Electrical Conductivity of Vitreous Substances by Rudol'f L. Myuller English | PDF | 1971 | 200 Pages | ISBN : 1475750641 | 24.3 MB [/b]  Free Download Electric Contacts: Theory and Application by Ragnar Holm English | PDF | 1967 | 503 Pages | ISBN : 3540038752 | 50.9 MB This book is a completely revised and rewritten edition of "Electric Contacts Handbook" published in 1958. A large number of new in vestigations are considered, and many of the basic theories are revised in detail and even in general. The body of information had to be limited as it was not advisable to increase the volume of the book. In particular, no attempt was made to cover all of the practical applications. They appear as examples following concentrated explanations of basic phenomena. As in several branches of technology, the solutions of problems ari sing in the field of electric contacts involve insight into various disci plines of physics. It is feit that reviews of some of those topics, especi ally adapted to electric contact phenomena, are welcome to many readers. For example, chapters have been devoted to the structure of carbon, the band theory of electric conduction in solids, certain pro blems in statistics, and the theory of the electric arc. As regards arc problems, new ideas have been introduced. In order to make the main text less cumbersome, such reviews are presented as appendices. Throughout this edition, the mksa-unit system is used in accord with the latest recommendation for standardization of units in scientific and technical writings. The chapter "History of Early Investigations on Contacts" forming Part IV in the preceding edition of 1958 has not been repeated in this book.  Free Download Einfach Kochen in leichter Sprache By Steffen Schwab Deutsch | PDF | 2018 | 118 Pages | ISBN : 3662556537 | 119.19 MB Dieses Kochbuch ist in Leichter Sprache.Leichte Sprache hilft Menschen mit geistiger Behinderung.Das Buch ist auch gut für andere Menschen.  Free Download Econometrics: Statistical Foundations and Applications by Phoebus J. Dhrymes English | PDF | 1974 | 605 Pages | ISBN : 0387900950 | 101.4 MB T his book was written, primarily, for the graduate student in econo- metrics. Its purpose is to provide a reasonably complete and rigorous exposition of the techniques frequently employed in econometric research, beyond what one is likely to encounter in an introductory mathematical statistics course. It does not aim at teaching how one can do successful original empirical research. Unfortunately, no one has yet discovered how to communicate this skill impersonally. Practicing econometricians may also find the integrated presentation of simultaneous equations estimation theory and spectral analysis a convenient reference.  Free Download Ecology of Angola: Terrestrial Biomes and Ecoregions by Brian John Huntley English | EPUB (True) | 2023 | 479 Pages | ISBN : 3031189221 | 149.9 MB This book richly illustrates the first, and comprehensive, account of the country's biomes and ecoregions, the driving forces that account for their diversity and vulnerability, and the ecological principles that provide an understanding of the patterns and processes that have shaped landscapes, ecoregions, and ecosystems. Angola encompasses the greatest diversity of terrestrial biomes and is the second richest in terms of ecoregions, of any African country. Yet its biodiversity and the structure and functioning of its ecosystems are largely undocumented. The author draws on personal field observations from over 50 years of involvement in ecological and conservation studies in Angola and across Southern Africa. The vast recent literature published by researchers in neighboring, better resourced countries provides depth to the accounts of ecological principles and processes relevant to Angola and thus contributing to the understanding and sustainable management of its natural resources.  Free Download Ecological Risks of Emerging Pollutants in Urbanizing Regions by Yonglong Lu, Pei Wang, Jingjing Yuan English | EPUB (True) | 2023 | 402 Pages | ISBN : 9811996296 | 164.6 MB This book characterizes the major pollution patterns of emerging contaminants, such as sources, emission effluents, temporal and spatial distributions, multi-media transportation and transformation processes, exposure pathways to ecosystems and humans, and ecological risks. Based on this, it establishes an urbanizing region management concept and highlights how urbanization and its regional ecology have evolved into a more integrated vision. It also decouples the relations between urbanization and emissions of emerging pollutants that are framed within a broad socio-ecological context considering institutions, policies, and governance. All the theory, methods, and case studies have been taken from the authors' publications, which have undergone rigorous international peer review. The book presents the spatial distribution, pathways, and flow diagrams of the pollutants as well as the interactions between urbanization and regional pollution and includes detailed figures and pictures. It also investigates ecological risk characterization and expression using maps based on geographic information systems to illustrate the general profile and the spatial variation of risks.  Free Download Eco-friendly and Smart Polymer Systems by Hamid Mirzadeh English | EPUB | 2020 | 747 Pages | ISBN : 3030450848 | 100.8 MB This proceedings book presents the main findings of the 13th International Seminar on Polymer Science and Technology ( ISPST 2018), which was held at Amirkabir University of Technology, Tehran, on November 10-22, 2018. This forum was the culmination of more than three decades of academic and industrial activities of Iranian scholars and professionals, and the participation of many notable international scientists, in covering various important polymer-related subjects of concern to Iran and the world at large, including polymer synthesis, processing and properties, as well as issues concerning polymer degradation, stability, and environmental aspects. |
:
