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1000 tulosta hakusanalla Levin Boris
The book comprises a new method of solving the integral equation of Leontovich, the most rigorous and most effective equation for the current in thin linear antennas. The book describes the features of the new method in its application in various types of antennas. It considers new ways of analyzing antennas, in particular in the calculation of an antenna gain based on main radiation patterns and the calculation of the directional characteristics of radiators with known distribution of current amplitude. The method of electrostatic analogy proposed by the author, provides the base for comparison of electromagnetic fields of high-frequency currents and electrostatic charges located on linear conductors to improve the directional characteristics of log-periodic and director-type antennas. A new approach to the analysis of the electrical characteristics of a microstrip antenna, which allows expansion of its operation range, is substantiated and developed. New results of antenna synthesis are obtained. The second part of the book is devoted to specific types of antennas (the author had a significant role in their creation). Particular attention is given to ship antennas for different frequency ranges.The book is intended for professionals, working in electrodynamics and those working on development, placement and exploitation of antennas. It will be useful for lecturers (university-level professors), teachers, students of radio engineering and researchers working in various fields of radio electronics and interested in an in-depth study of theoretical problems and designs f antennas. It can also be used for short university courses.
The book comprises a new method of solving the integral equation of Leontovich, the most rigorous and most effective equation for the current in thin linear antennas. The book describes the features of the new method in its application in various types of antennas. It considers new ways of analyzing antennas, in particular in the calculation of an antenna gain based on main radiation patterns and the calculation of the directional characteristics of radiators with known distribution of current amplitude. The method of electrostatic analogy proposed by the author, provides the base for comparison of electromagnetic fields of high-frequency currents and electrostatic charges located on linear conductors to improve the directional characteristics of log-periodic and director-type antennas. A new approach to the analysis of the electrical characteristics of a microstrip antenna, which allows expansion of its operation range, is substantiated and developed. New results of antenna synthesis are obtained. The second part of the book is devoted to specific types of antennas (the author had a significant role in their creation). Particular attention is given to ship antennas for different frequency ranges.The book is intended for professionals, working in electrodynamics and those working on development, placement and exploitation of antennas. It will be useful for lecturers (university-level professors), teachers, students of radio engineering and researchers working in various fields of radio electronics and interested in an in-depth study of theoretical problems and designs f antennas. It can also be used for short university courses.
Expanding the range of antenna frequency is the main objective of this book. Solutions proposed are based on the development of new theoretical methods for analyzing and synthesizing antennas. The book shows that concentrated capacitive loads connected along linear and V-antennas provide a high level of matching with a cable over a wide frequency range and improves directional characteristics of antennas, i.e. increases the communication distance.New theoretical methods are proposed for analysis and synthesis of antennas under consideration: 1) method of calculating directional characteristics of radiators with a given current distribution, and 2) method of electrostatic analogy for calculating mutual and total fields of complex multi-element radiating structures. These methods allow us to obtain optimal directional characteristics for director-type antennas (arrays of Yagi-Uda) and log-periodic antennas with concentrated capacitances and show that use of capacitors makes it possible to extend the frequency range of the director antennas and to decrease dimensions of the log-periodic antennasMulti-element (flat and three-dimensional) self-complementary antennas with different variants of connecting generator poles and cable wires to antenna elements are proposed, which improves the matching with a cable. Characteristics of flat structures are compared with characteristics of volume structures: conical, parabolic, and located on a pyramid edges.The book describes new versions of transparent antennas, antennas for cellular communication, multi-tier and multi-radiator antennas, and much more.
The book deals with theoretical and experimental research of antennas. The presentation is based on the electromagnetic theory. It begins with the theory of thin antennas. Thin antennas represent one of the main types of radiators, thus the theory of thin antennas is the basis of the antennas analysis. Special attention is paid to the integral equation of Leontovich-Levin for a current along a straight thin-walled metal cylinder, which is equivalent to the equation of Hallen with a precise kernel. Together with the analysis of various types of antennas, the book deals with the problems of synthesis including the creation a wide-band radiator by means of determining of the types and the magnitudes of concentrated loads, which are connected along a linear radiator and create in a given frequency band high electrical performance. Problems of antenna engineering are discussed in the second half of the book, including the results of application of a compensation method for the protection of humans against irradiation and structural features of ship antennas.
This book describes both known and new results. In the sections devoted to the use of integral equations for the current in a linear metal radiator, the focus is on Leontovich's equation. An advantage of this equation is the simplicity of the solution and the absence of the argument f in it because the integration over f already performed. The refined solution makes it possible to determine the total sum of the series for the current, which is close to the known solution including only the first terms. The results of the synthesis of different types of antennas with capacitive loads are presented, which makes it possible to implement Hallen's hypothesis about the usefulness of applying such loads to create an in-phase current distribution in antennas and to obtain required characteristics.New results include the widespread use of the complex potential method in relation to the calculation of capacitive structures in homogeneous and inhomogeneous media, antenna patterns and flows of electrical fields between antenna elements and in the surrounding space. In particular, the analysis of field flows makes it possible to substantiate a rigorous method for analyzing microstrip antennas. The characteristics of antennas in various conditions of their installation are considered and compared. The results of the use of multi-floors structures that provide in the wide frequency range the radiation in direction perpendicular to the antenna axis, and structures that make it possible to reduce the mutual influence of antennas located at different heights on a common mast are described.
Expanding the range of antenna frequency is the main objective of this book. Solutions proposed are based on the development of new theoretical methods for analyzing and synthesizing antennas. The book shows that concentrated capacitive loads connected along linear and V-antennas provide a high level of matching with a cable over a wide frequency range and improves directional characteristics of antennas, i.e. increases the communication distance.New theoretical methods are proposed for analysis and synthesis of antennas under consideration: 1) method of calculating directional characteristics of radiators with a given current distribution, and 2) method of electrostatic analogy for calculating mutual and total fields of complex multi-element radiating structures. These methods allow us to obtain optimal directional characteristics for director-type antennas (arrays of Yagi-Uda) and log-periodic antennas with concentrated capacitances and show that use of capacitors makes it possible to extend the frequency range of the director antennas and to decrease dimensions of the log-periodic antennasMulti-element (flat and three-dimensional) self-complementary antennas with different variants of connecting generator poles and cable wires to antenna elements are proposed, which improves the matching with a cable. Characteristics of flat structures are compared with characteristics of volume structures: conical, parabolic, and located on a pyramid edges.The book describes new versions of transparent antennas, antennas for cellular communication, multi-tier and multi-radiator antennas, and much more.
The book deals with theoretical and experimental research of antennas. The presentation is based on the electromagnetic theory. It begins with the theory of thin antennas. Thin antennas represent one of the main types of radiators, thus the theory of thin antennas is the basis of the antennas analysis. Special attention is paid to the integral equation of Leontovich-Levin for a current along a straight thin-walled metal cylinder, which is equivalent to the equation of Hallen with a precise kernel. Together with the analysis of various types of antennas, the book deals with the problems of synthesis including the creation a wide-band radiator by means of determining of the types and the magnitudes of concentrated loads, which are connected along a linear radiator and create in a given frequency band high electrical performance. Problems of antenna engineering are discussed in the second half of the book, including the results of application of a compensation method for the protection of humans against irradiation and structural features of ship antennas.
The Theory of Thin Antennas and Its Use in Antenna Engineering
Boris Levin
Bentham Science Publishers
2018
nidottu
This book deals with the methods of theoretical and experimental research of antennas, which are based on the electromagnetic (EM) theory. The theory of thin antennas is the basis of antenna analysis, as thin antennas represent one of the main types of radiators and are extensively applied as both independent antennas and as elements of more complicated antennas. The contents of the book cover new methods of antenna analysis and design, including the theory of electrically coupled lines, the methods of complex potential, compensation, impedance line, and mathematical programming among others. New results of using these methods are obtained and described. The complex potential method is generalized to inhomogeneous media and is employed in conical and parabolic problems. The theory of electrically coupled lines allows considering theoretical problems of multi-conductor cables and multi-radiator antennas. The compensation method permits creating a weak field area in the near region of a transmitting antenna. The method of impedance line is applied to antennas with loads, and it permits, together with the method of mathematical programming, selecting loads to develop antennas with the required characteristics. The methods described within this text enable engineers to calculate parameters for new types of antennas, particularly, of new self-complementary antennas. In the general case, its properties pertain to the three-dimensional self-complementary antennas, their variants are considered in the book. Close attention is also paid to the field compensation in the near region of a transmitting antenna and to the creation of the 'dark spot'. The book is an essential reference for graduates and researchers requiring knowledge of the design and engineering of new antennas as well as the underlying electromagnetic and mathematical methods of its analysis and synthesis.
This second edition reflects significant progress in tsunami research, monitoring and mitigation within the last decade. Primarily meant to summarize the state-of-the-art knowledge on physics of tsunamis, it describes up-to-date models of tsunamis generated by a submarine earthquake, landslide, volcanic eruption, meteorite impact, and moving atmospheric pressure inhomogeneities. Models of tsunami propagation and run-up are also discussed. The book investigates methods of tsunami monitoring including coastal mareographs, deep-water pressure gauges, GPS buoys, satellite altimetry, the study of ionospheric disturbances caused by tsunamis and the study of paleotsunamis. Non-linear phenomena in tsunami source and manifestations of water compressibility are discussed in the context of their contribution to the wave amplitude and energy. The practical method of calculating the initial elevation on a water surface at a seismotectonic tsunami source is expounded. Potential and eddy traces ofa tsunamigenic earthquake in the ocean are examined in terms of their applicability to tsunami warning. The first edition of this book was published in 2009. Since then, a few catastrophic events occurred, including the 2011 Tohoku tsunami, which is well known all over the world. The book is intended for researchers, students and specialists in oceanography, geophysics, seismology, hydro-acoustics, geology, and geomorphology, including the engineering and insurance industries.
This second edition reflects significant progress in tsunami research, monitoring and mitigation within the last decade. Primarily meant to summarize the state-of-the-art knowledge on physics of tsunamis, it describes up-to-date models of tsunamis generated by a submarine earthquake, landslide, volcanic eruption, meteorite impact, and moving atmospheric pressure inhomogeneities. Models of tsunami propagation and run-up are also discussed. The book investigates methods of tsunami monitoring including coastal mareographs, deep-water pressure gauges, GPS buoys, satellite altimetry, the study of ionospheric disturbances caused by tsunamis and the study of paleotsunamis. Non-linear phenomena in tsunami source and manifestations of water compressibility are discussed in the context of their contribution to the wave amplitude and energy. The practical method of calculating the initial elevation on a water surface at a seismotectonic tsunami source is expounded. Potential and eddy traces ofa tsunamigenic earthquake in the ocean are examined in terms of their applicability to tsunami warning. The first edition of this book was published in 2009. Since then, a few catastrophic events occurred, including the 2011 Tohoku tsunami, which is well known all over the world. The book is intended for researchers, students and specialists in oceanography, geophysics, seismology, hydro-acoustics, geology, and geomorphology, including the engineering and insurance industries.
ORTOPOZITRONIJ i NOVAYa (dopolnitel'naq) Gh/ck-FIZIKA
Boris Lewin
Lap Lambert Academic Publishing
2019
nidottu
Ljubov vo vremja Shivy.Skazka, rasskazannaja samomu sebe
Boris Levit-Broun; Boris Levit-Broun
Aletejja
2026
sidottu
Novaja kniga Borisa Levita-Brouna "Ljubov vo vremja Shivy" - bez preuvelichenija bolshoj roman. Sluchajnoe znakomstvo, vspykhnuvshaja ljubovnaja strast odnogo leta i tysjacheletija nepostizhimykh induistskikh drevnostej - vot poljusy, mezhdu kotorymi razvivaetsja, a poroj mechetsja v rusle prikhotlivogo i prekrasnogo russkogo jazyka mnogoobraznoe povestvovanie. Kak vsegda u etogo avtora, neskolko narrativnykh i psikhologicheskikh plastov spletajutsja v gustuju zavjaz eroticheskoj gorjachki i filosofskikh razmyshlenij, fontanirujuschikh seksualnykh strastej i kompleksov nepolnotsennosti, edkoj samoironii, vospominanij o proshlom i sozertsanij roskoshnoj prirody ogromnogo gornogo ozera severnoj Italii. No vsja eta mnogoaspektnost summa ekzistentsialnykh sostavljajuschikh, pogruzhjonnykh v gigantskuju galaktiku drevnej Indii, ejo mifov, ejo neobuzdannoj pokhoti, ejo bezdonnoj istorii i protivorechivoj mistiki. Eto tselaja vselennaja, gromadnaja mozaika. A eschjo eto literaturnyj shedevr.
In a wide-ranging 2007 study of Claude Lévi-Strauss's aesthetic thought, Boris Wiseman demonstrates not only its centrality within his oeuvre but also the importance of Levi-Strauss for contemporary aesthetic enquiry. Reconstructing the internal logic of Lévi-Strauss's thinking on aesthetics, and showing how anthropological and aesthetic ideas intertwine at the most elemental levels in the elaboration of his system of thought, Wiseman demonstrates that Lévi-Strauss's aesthetic theory forms an integral part of his approach to Amerindian masks, body decoration and mythology. He reveals the significance of Lévi-Strauss's anthropological analysis of an 'untamed' mode of thinking (pensée sauvage) at work in totemism, classification and myth-making for his conception of art and aesthetic experience. In this way, structural anthropology is shown to lead to ethnoaesthetics. Lévi-Strauss, Anthropology and Aesthetics adopts a broad-ranging approach that combines the different perspectives of anthropology, philosophy, aesthetic theory and literary criticism into an unusual and imaginative whole.
In a wide-ranging 2007 study of Claude Lévi-Strauss's aesthetic thought, Boris Wiseman demonstrates not only its centrality within his oeuvre but also the importance of Levi-Strauss for contemporary aesthetic enquiry. Reconstructing the internal logic of Lévi-Strauss's thinking on aesthetics, and showing how anthropological and aesthetic ideas intertwine at the most elemental levels in the elaboration of his system of thought, Wiseman demonstrates that Lévi-Strauss's aesthetic theory forms an integral part of his approach to Amerindian masks, body decoration and mythology. He reveals the significance of Lévi-Strauss's anthropological analysis of an 'untamed' mode of thinking (pensée sauvage) at work in totemism, classification and myth-making for his conception of art and aesthetic experience. In this way, structural anthropology is shown to lead to ethnoaesthetics. Lévi-Strauss, Anthropology and Aesthetics adopts a broad-ranging approach that combines the different perspectives of anthropology, philosophy, aesthetic theory and literary criticism into an unusual and imaginative whole.
Here is the amazing autobiography of a man born to a life of wealth and privilege as the youngest son of a Siberian industrial tycoon. With the coming of the Russian Revolution, his charmed life is swept away, and he is thrust into a world of poverty and oppression. Relying solely on his wits, his optimism, and luck, he makes his way to Germany, where he becomes a successful mining engineer, despite the privations of the German depression. But then, in a single day, his secure position is lost, and he becomes a hunted man. Follow his five-year flight from Nazi persecution through Holland, Belgium, and France, as he strives to achieve his lifelong dream--to reach the US. Confronted with desperate and terrifying circumstances--both in revolutionary Russia and Nazi Germany--Boris J. Kochanowsky tells a story of loss and survival, of horror and heroism, of struggle and hope. With an introduction and epilogue by his daughter, Vera Kochanowsky, this volume includes over fifty photographs and illustrations.
Vladimir Lenin - chelovek osobogo roda. Pomimo bolshoj roli, sygrannoj im v istorii, on nalozhil glubokij otpechatok na razvitie ne tolko Rossii i Vostochnoj Evropy, no takzhe i drugikh chastej zemnogo shara. Leninym bylo napisano ochen mnogo i ochen mnogo bylo napisano o nem. Odnako vne zavisimosti ot ubezhdenij i vzgljadov, nelzja ne priznat ogromnuju vazhnost takoj figury, kak Lenin v istorii nashej strany. Boris Sokolov priotkryvaet zavesu tajn i zagadok, zastavljaja chitatelja po-novomu vzgljanut na velichajshuju lichnost KHKh stoletija. Iz knigi "Lenin" vy uznaete: - Kto byl sopernitsej Nadezhdy Krupskoj? - Kak Lenin otmyval nemetskie dengi? - V chem svjaz mezhdu romanom "Master i Margarita" i revoljutsiej 1917 goda? - Pochemu Vladimir Uljanov byl protiv khristianstva i religii? Fishki knigi: - Unikalnyj material i novye fakty o biografii velikogo politika; - Ostroumnye aforizmy i tsitaty Vladimira Lenina. Dlja kogo kniga: - Dlja tekh, kto ljubit istoriju, biografii i memuary; - Dlja tekh, kto v odnom izdanii ischet vse otvety na svoi voprosy; - Dlja tekh, kogo uvlekajut zagadki istorii.
Introducing Lévi-Strauss is a guide to the work of the great French anthropologist Claude Lévi-Strauss (1908-2009). The book brilliantly traces the development and influence of Lévi-Strauss' thought, from his early work on the function of the incest taboo to initiate an exchange of women between groups, to his identification of a timeless "wild" or "primitive" mode of thinking - a pensée sauvage - behind the processes of human culture. Accessibly written by Boris Wiseman and beautifully illustrated by Judy Groves, Introducing Lévi-Strauss also explores the major contribution that Lévi-Strauss made to contemporary aesthetic history - his work on American-Indian mythology provides a key insight into the way in which art itself comes into being.This is an essential introduction to a key thinker.