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Elsevier

Libros en Física

  • Some Aspects of Vacuum Ultraviolet Radiation Physics

    International Series of Monographs in Natural Philosophy
    • 1 Edición
    • Nicole Damany + 2 más
    • Inglés
    Some Aspects of Vacuum Ultraviolet Radiation Physics presents some data on the state of research in vacuum ultraviolet radiation in association with areas of physics. Organized into four parts, this book begins by elucidating the optical properties of solids in the vacuum ultraviolet region (v.u.v.), particularly the specific methods of determination of optical constants in v.u.v., the properties of metals, and those of ionic insulators. Part II deals with molecular spectroscopy, with emphasis on the spectra of diatomic and simple polyatomic molecules, paraffins, and condensed phases. Part III focuses on some aspects of emission spectroscopy in the v.u.v. in relation to laboratory plasmas. The last part describes the image formation by concave gratings, spectrophotometry, and diffusion by surfaces. This book will be very valuable to physicist and graduate students inclined to this field of interest.

  • The Few Body Problem

    Proceedings of the Ninth International Conference on the Few Body Problem, Eugene, Oregon, USA, 17-23 August 1980
    • 1 Edición
    • F. S. Levin
    • Inglés
    The Few Body Problem covers the proceedings of the Ninth International Conference on the Few Body Problem, held in Eugene, Oregon, USA on August 17-23, 1980. The book focuses on relativistic and particle physics, intermediate energy physics, nuclear, atomic, and molecular physics, and chemistry. The selection first offers information on nucleon-nucleon interaction in applications, including derivation of the nucleon-nucleon potential, nuclear many-body problem, and classic nuclear structure. The text also looks at three- and four-nucleon systems and graphs of three-body wave functions. The publication elaborates on K-meson experiments and non-mesonic few-nucleon phenomena. Topics include tests of invariance principles, properties of nuclei, dynamics, and hypernuclear physics. The manuscript also ponders on the Coulomb problem, atomic, molecular, and nuclear collisions, and muon capture in hydrogen isotopes. The selection is a dependable reference for readers interested in the few body problem.

  • Space and Development

    Proceedings of the Vikram Sarabhai Symposium on Space and Development of the Twenty-second Plenary Meeting of COSPAR, Bangalore, India, 29 May to 9 June 1979
    • 1 Edición
    • Yash Pal
    • Inglés
    Space and Development contains the proceedings of the Vikram Sarabhai Symposium on Space and Development, held at Bangalore, India from May 29 to June 9, 1979. The book provides the papers presented in the symposium, examining the relevance of space technology to the problems being faced by developing countries in the world. The collection of papers, written and prepared by socially committed space scientists, attempts to foster enlightenment on the issue of whether space technology is significant to the solution of the problems besetting mankind, specifically the developing nations. Discussions on topics regarding the applicability and benefit of space science to countries at all stages of development; the role of science and technology in accelerating social and economic progress; and geologic and educational applications of space technologies are presented. The book also includes a transcript of a panel discussion by the participants of the symposium. Space scientists, astronomers, geologists, physicists, economists, sociologists, and people interested to understand the ramifications of space technology on our lives will find this book invaluable.

  • Poland, Solidarity, Walesa

    • 1 Edición
    • Michael R. Dobbs + 2 más
    • David P. Baker
    • Inglés
    Poland: Solidarity: Walesa is a three-chapter book that details the life and significant contribution of Lech Walesa of Poland. Lech Walesa is the leader of an independent labor organization - Solidarity. The book begins with the background of crisis in Poland. The peaceful revolution is then described. The last chapter elaborates on the concept of Lech Walesa as the symbol of Polish August.

  • Advances and Trends in Structures and Dynamics

    Papers Presented at the Symposium on Advances and Trends in Structures and Dynamics, Held 22-25 October 1984, Washington, D.C.
    • 1 Edición
    • Ahmed K. Noor + 1 más
    • Inglés
    Advances and Trends in Structures and Dynamics contains papers presented at the symposium on Advances and Trends in Structures and Dynamics held in Washington, D.C., on October 22-25, 1984. Separating 67 papers of the symposium as chapters, this book documents some of the major advances in the structures and dynamics discipline. The chapters are further organized into 13 parts. The first three parts explore the trends and advances in engineering software and hardware; numerical analysis and parallel algorithms; and finite element technology. Subsequent parts show computational strategies for nonlinear and fracture mechanics problems; mechanics of materials and structural theories; structural and dynamic stability; multidisciplinary and interaction problems; composite materials and structures; and optimization. Other chapters focus on random motion and dynamic response; tire modeling and contact problems; damping and control of spacecraft structures; and advanced structural applications.

  • Radiation Damage in Graphite

    International Series of Monographs in Nuclear Energy
    • 1 Edición
    • J. H. W. Simmons
    • J. V. Dunworth
    • Inglés
    Nuclear Energy, Volume 102: Radiation Damage in Graphite provides a general account of the effects of irradiation on graphite. This book presents valuable work on the structure of the defects produced in graphite crystals by irradiation. Organized into eight chapters, this volume begins with an overview of the description of the methods of manufacturing graphite and of its physical properties. This text then presents details of the method of setting up a scale of irradiation dose. Other chapters consider the effect of irradiation at a given temperature on a physical property of graphite. This book discusses as well the changes in dimensions produced by irradiation and the effects of irradiation on the mechanical properties of graphite. The final chapter deals with the accumulation of stored energy, which is one of the main problems caused by the irradiation of graphite in nuclear reactors. This book is a valuable resource for physicists and chemical physicists.

  • Theory of Oscillators

    Adiwes International Series in Physics
    • 1 Edición
    • A. A. Andronov + 2 más
    • Inglés
    Theory of Oscillators presents the applications and exposition of the qualitative theory of differential equations. This book discusses the idea of a discontinuous transition in a dynamic process. Organized into 11 chapters, this book begins with an overview of the simplest type of oscillatory system in which the motion is described by a linear differential equation. This text then examines the character of the motion of the representative point along the hyperbola. Other chapters consider examples of two basic types of non-linear non-conservative systems, namely, dissipative systems and self-oscillating systems. This book discusses as well the discontinuous self-oscillations of a symmetrical multi-vibrator neglecting anode reaction. The final chapter deals with the immense practical importance of the stability of physical systems containing energy sources particularly control systems. This book is a valuable resource for electrical engineers, scientists, physicists, and mathematicians.

  • Experiments in Physical Chemistry

    • 2 Edición
    • J. M. Wilson + 2 más
    • Inglés
    Experiments in Physical Chemistry, Second Edition provides a compilation of experiments concerning physical chemistry. This book illustrates the link between the theory and practice of physical chemistry. Organized into three parts, this edition begins with an overview of those experiments that generally have a simple theoretical background. Part II contains experiments that are associated with more advanced theory or more developed techniques, or which require a greater degree of experimental skill. Part III consists of experiments that are in the nature of investigations wherein these investigations may be regarded as minor research project suitable for final-year students. This book is intended to be suitable for university students who are majoring in Chemistry.

  • Advances in Mass Spectrometry

    Proceedings of a Conference Held in Oxford, September 1961
    • 1 Edición
    • R. M. Elliott
    • Inglés
    Advances in Mass Spectrometry, Volume 2 documents the proceedings of a conference on mass spectrometry held in Oxford in September 1961. This compilation is categorized into six major topics — mass spectrometry in research; mass spectrometry of inorganic compounds; instruments and techniques; theory and correlation of mass spectra; mass spectra and analysis; and ionization and dissociation. Under these major topics, parts of the papers discussed include field ionization mass spectroscopy; initial kinetic energy discrimination effects in crossed-field ion sources; mass spectrometric study of CaO and Ta; and spark source mass spectrometry as an analytical technique. The book also covers discussions on initial energy of hydrocarbon fragment ions; determination of the structure of alkaloids by mass spectrometry; and application of a time-of-flight mass spectrometer to the examination of ion-molecule interactions. This volume is a useful reference to students and researchers conducting work on mass spectrometry.

  • Classical Theory of Electric and Magnetic Fields

    • 1 Edición
    • Roland H. Good + 1 más
    • Inglés
    Classical Theory of Electric and Magnetic Fields is a textbook on the principles of electricity and magnetism. This book discusses mathematical techniques, calculations, with examples of physical reasoning, that are generally applied in theoretical physics. This text reviews the classical theory of electric and magnetic fields, Maxwell's Equations, Lorentz Force, and Faraday's Law of Induction. The book also focuses on electrostatics and the general methods for solving electrostatic problems concerning images, inversion, complex variable, or separation of variables. The text also explains magnetostatics and compares the calculation methods of electrostatics with those of magnetostatics. The book also discusses electromagnetic wave phenomena concerning wave equations with a source term and the Maxwell equations which are linear and homogenous. The book also explains Einstein's the Special Theory of Relativity which is applicable' only to inertial coordinate systems. The text also discusses the particle aspects of electromagnetic field equations such as those concerning wave equations for particles with spin. This textbook is intended for graduate or advanced students and academicians in the field of physics.

  • The Plane Wave Spectrum Representation of Electromagnetic Fields

    International Series of Monographs in Electromagnetic Waves
    • 1 Edición
    • P. C. Clemmow
    • Inglés
    The Plane Wave Spectrum Representation of Electromagnetic Fields presents the theory of the electromagnetic field with emphasis to the plane wave. This book explains how fundamental electromagnetic fields can be represented by the superstition of plane waves traveling in different directions. Organized into two parts encompassing eight chapters, this book starts with an overview of the methods whereby plane wave spectrum representation can be used in attacking different characteristic problems belonging to the theories of radiation, diffraction, and propagation. This book then discusses the concept of relative simplicity of plane wave solutions of Maxwell's equations whereby their use enables some of the significant elementary physical and engineering characteristics of the electromagnetic field to be clarified. Other chapters consider the concept of an infinitely thin screen that is absolutely absorbing. The final chapter deals with the complicated problems that occur when anisotropic media are involved. Mathematicians and physicists will find this book useful.

  • The Contributions of Faraday and Maxwell to Electrical Science

    • 1 Edición
    • R. A. R. Tricker
    • D. ter Haar
    • Inglés
    The Contributions of Faraday and Maxwell to Electrical Science deals with the development of electromagnetic theory following the establishment of the basis for the first law of circulation relating to the magnetic fields generated by steady currents. This book is organized into two parts encompassing nine chapters that specifically treat the provision of the basis for the second law of circulation, the law that deals with the induction of currents, which was predominantly the work of British physicists, Michael Faraday and James Clerk Maxwell. Part I highlights their life, career, and contributions in electrical science. This part emphasizes Faraday’s discovery of electromagnetic induction and Maxwell’s development of electromagnetic theory. Part II presents their experimental studies on electricity and magnetism. This book will prove useful to physicists, electrical scientists, and researchers in the allied fields.

  • The Metallurgy of Nuclear Fuel

    Properties and Principles of the Technology of Uranium, Thorium and Plutonium
    • 1 Edición
    • V. S. Yemel'Yanov + 1 más
    • J. V. Dunworth
    • Inglés
    The Metallurgy of Nuclear Fuel: Properties and Principles of the Technology of Uranium, Thorium and Plutonium is a systematic analysis of the metallurgy of nuclear fuel, with emphasis on the physical, mechanical, and chemical properties as well as the technology of uranium, thorium, and plutonium, together with their alloys and compounds. The minerals and raw material sources of nuclear fuel are discussed, along with the principles of the technology of the raw material processing and the production of the principal compounds, and of the pure metals and alloys. Comprised of three parts, this volume begins with an introduction to the history of the discovery of uranium and its position in the periodic system; its use as a nuclear fuel; radioactivity and isotopic composition; alloys and compounds; and physical, mechanical, and chemical properties. The effect of mechanical and thermal treatment, thermal cycling and irradiation on the physicochemical properties of uranium is also examined. The next two sections are devoted to thorium and plutonium and includes chapters dealing with their uses, alloys and compounds, and methods of recovery and purification. This book is written for university students, but should also prove useful to young production engineers and scientific workers who are concerned with problems in the metallurgy of nuclear fuel.

  • Computer Techniques for Electromagnetics

    International Series of Monographs in Electrical Engineering
    • 1 Edición
    • R. Mittra
    • Inglés
    Computer Techniques for Electromagnetics discusses the ways in which computer techniques solve practical problems in electromagnetics. It discusses the impact of the emergence of high-speed computers in the study of electromagnetics. This text provides a brief background on the approaches used by mathematical analysts in solving integral equations. It also demonstrates how to use computer techniques in computing current distribution, radar scattering, and waveguide discontinuities, and inverse scattering. This book will be useful for students looking for a comprehensive text on computer techniques on electromagnetics.

  • Neuroanatomical Research Techniques

    • 1 Edición
    • Richard T. Robertson
    • Inglés
    Neuroanatomical Research Techniques discusses developments in major neuroanatomical research techniques. The book is organized into four parts. Part I deals generally with the preparation and study of brain tissue. It includes a chapter on the microscope, discussing optical magnification, limitations of microscopy, and optical contrasting methods. Other chapters summarize basic techniques for tissue preparation and sectioning; present guidelines for a number of standard, but essential, staining procedures; and present sophisticated and contemporary computer techniques that are proving to be invaluable as neuroanatomy evolves from a qualitative to a quantitative discipline. Part II deals with techniques often used for the study of normal tissue. These include the Golgi method, fluorescence histochemistry, techniques for staining single neurons, and the use of the electron microscope. Part III presents techniques for studying intrinsic connections of the nervous system. These include techniques for silver impregnation of degenerating fibers; autoradiographic technique for studying axonal projections; and somatopetal movement of horseradish peroxidase as a tool for studying connections and neuron morphology. Part IV discusses the interpretation of results from neuroanatomical research techniques and presents examples of the applications of neuroanatomical methods to major problems in physiological psychology.

  • Investigations Into Electrical Discharges in Gases

    • 1 Edición
    • B. N. Klyarfel'D
    • Inglés
    Investigations into Electrical Discharges in Gases is a compilation of scientific articles that covers the advances in the investigation of the fundamental processes occurring in electrical discharges in gases and vapors. The book details the different aspects of the whole life cycle of an arc, which include the initiation of a discharge, its transition into an arc, the lateral spread of the arc column, and the recovery of electric strength after extinction of an arc. The text also discusses the methods for the dynamic measurement of vapor density in the vicinity of electrical discharges, along with the method for determining the surface current density at an anode. The selection will be of great use to researchers and practitioners of disciplines that deal with basic gas discharge.

  • Power Sources

    Research and Development in Non-Mechanical Electrical Power Sources
    • 1 Edición
    • D. H. Collins
    • Inglés
    Power Sources: Research and Development in Non-Mechanical Electrical Power Sources presents the developments in the production of batteries and other power sources. This book discusses the technological advances and limitless possibilities in the production of various types of batteries. Organized into 40 chapters, this book starts with an overview of the maximum steady potential for the fully oxidized pyrolytic graphite. This text then explores the competition between zincate and surfactants for absorption sites. Other chapters consider the main factors influencing the discharge of alkaline manganese dioxide cells. This book discusses as well the significance of the porous nature of manganese dioxides in relation to their battery activity. The final chapter deals with thermoelectric power, which is being used for cathodic corrosion protection, instrumentation, communication, and navigational aids. This book is a valuable resource for scientists, technologists, and researchers. Electrical and electronic engineers will also find this book extremely useful.

  • Vestibular Function on Earth and in Space

    Proceedings of the Bárány Society Vestibular Symposium Held in Uppsala, May 1968 under the Presidency of Professor Arne Sjöberg
    • 1 Edición
    • J. Stahle
    • Inglés
    Wenner-Gren Center International Symposium Series, Volume 15: Vestibular Function on Earth and in Space provides information pertinent to the fundamental aspects of vestibular research. This book discusses the problems concerned with space, with emphasis on the importance of the vestibular apparatus in space flight. Organized into 32 chapters, this volume begins with an overview of the mechanisms and processes for creating the chemical composition of endolymph. This text then examines the speculative comparisons between prolonged exposure in a manne weightless space station and in a rotating space station. Other chapters consider the relationships between vestibular nystagmus and degradation of visual acuity when the vestibular stimuli interfere with voluntary efforts to see specific visual detail. This book discusses as well the concepts concerning the distribution of function between semicircular canals and otolith organs. The final chapter deals with the method for selective marking of neurons after axonal transection. This book is a valuable resource for otologists and scientists.

  • Schering Workshop on Pharmacokinetics, Berlin, May 8 and 9, 1969

    Advances in the Biosciences
    • 1 Edición
    • Gerhard Raspé
    • Inglés
    Advances in the Biosciences 5: Schering Workshop on Pharmacokinetics, Berlin, May 8 and 9, 1969 is a collection of papers presented at the Schering Workshop on Pharmacokinetics held in Berlin, Germany, on May 8 and 9, 1969. Contributors focus on advances in the field of pharmacokinetics, including the use of digital computers in defining pharmacokinetic parameters and of mathematical models in the study of steroid dynamics. The pharmacokinetics of acetazolamide and endogenous substances is also described. This book is comprised of 19 chapters and begins with an overview of the basic concepts and experimental methods of pharmacokinetics, followed by a discussion on the general physico-chemical aspects of drug distribution. Subsequent chapters explore multiple dose elimination kinetics and drug accumulation in patients with normal and impaired kidney function; the application of analog and digital computers in pharmacokinetics; use of mathematical tools in defining pharmacokinetic parameters; and measurement of enteric absorption rate using a double tracer technique. Mathematical and statistical problems in pharmacokinetics are also presented. This monograph will be a useful resource for pharmacologists and biologists.

  • Physics and Chemistry of the Earth

    Progress Series, Volume 7
    • 1 Edición
    • L. H. Ahrens + 2 más
    • Inglés
    Physics and Chemistry of the Earth, Volume VII focuses on three topics—orogenic fold-belts and a hypothesis of earth evolution; earthquake energy and magnitude; and meteoritic, solar, and terrestrial rare-earth distributions. This book consists of three chapters. Chapter 1 examines features of the distribution and history of the Precambrian fold-belts in relation to the theory of continental drift. The two kinds of information obtained from seismograph records—time readings and amplitude readings that provide information on the total seismic wave energy released in earthquakes—are elaborated in Chapter 2. Chapter 3 discusses the meteoritic and terrestrial matter in rare earth elements (REE). This publication is a good reference to students and researchers conducting work on earth science.

  • Static Electromagnetic Frequency Changers

    International Series of Monographs on Electronics and Instrumentation
    • 1 Edición
    • L. L. Rozhanskii
    • D. C. Macdonald
    • Inglés
    Static Electromagnetic Frequency Changers is about the theory, design, construction, and applications of static electromagnetic frequency changers, devices that used for multiplication or division of alternating current frequency. It is originally published in the Russian language. This book is organized into five chapters. The first three chapters introduce the readers to the principles of operation, the construction, and the potential applications of static electromagnetic frequency changers and to the principles of their design. The two concluding chapters use some hitherto unpublished work of the author and provide examples of the design of frequency doublers and triplers. This book will be of interest to engineers and scientific workers, engaged in the field of automatic control electrical machines and in other fields of technology connected with the use of alternating current above normal supply frequencies.

  • Biomass for Energy in the Developing Countries

    Current Role, Potential, Problems, Prospects
    • 1 Edición
    • D. O. Hall + 2 más
    • Inglés
    Biomass for Energy in the Developing Countries: Current Role, Potential, Problems, Prospects focuses on biomass energy and its importance to developing countries. This book outlines the reality that supply can no longer meet the demand of this form of energy. This fact is particularly observed in the rising price of oil, which is a prime source of energy for developing countries. Relative to this, a need to look for indigenous energy sources is urgent to sustain development in these countries. This book emphasizes that biomass energy utilization differs among developing countries, which shows the variance in energy needs. This text also notes that the pattern of biomass energy use in such countries is related to agriculture and also has cultural, economic, and social linkages. Biomass energy is also considered an important aspect in rural development and as a replacement for petroleum products. With the impending shortage of biomass energy, schemes are now being developed to sustain the use of this energy in household and industry settings, which is emphasized in the development of equipment considered energy efficient. People who are concerned with the development and implementation of programs aimed at conserving biomass energy and in the search of alternative energy can use this book as a reference.

  • Multiple Choice Questions in Ophthalmic and Neuroanatomy

    • 1 Edición
    • O.J. Lehmann
    • Inglés
    Multiple Choice Questions in Ophthalmic and Neuroanatomy was written from notes that made by the author while preparing for the College of Ophthalmologists' primary examination. At the time it was difficult to gauge the standard expected as there were no questions available. This book aims to help many candidates who need to learn this sort of anatomy and hopes that its appeal extends beyond budding ophthalmologists and general surgeons to include optometrists and orthoptists. The questions deal with the following topics: osteology; anatomy of the head and neck; vascular anatomy; neuroanatomy; orbital and autonomic anatomy; ocular adnexae and extraocular muscles; cranial nerves and visual pathway; ocular anatomy; and embryology.

  • Drugs and the Eye

    Sponsored by the British Optical Association
    • 1 Edición
    • Janet Vale + 1 más
    • Inglés
    Drugs and the Eye describes the mechanism of drug action in the eye. This book is composed of 14 chapters that discuss the practical aspects of drug use, the application of first aid, emergency measures, and legal aspects of the sale and supply of drugs. Some of the topics covered in the book are the anatomy and physiology of the eye, sites receiving cholinergic innervation, drug action at the muscarinic and nicotinic receptors; definition and identification of cycloplegic drugs; mode of action of atropine; use of mydriatics; muscarinic blocking drugs; and precautions with homatropine. Other chapters examine the dynamics and structure of sympathomimetic drugs, as well as the molecular structure and mode of action of cocaine. These topics are followed by discussions on the stimulation of the parasympathetic nerve by different types of miotics and the role of anticholinesterases in the eye. The final chapters look into the use of miotics to reverse mydriasis. The book can provide useful information to ophthalmic opticians, optometrists, students, and researchers.

  • Dynamics of Degeneration and Growth in Neurons

    Proceedings of the International Symposium Held in Wenner-Gren Center, Stockholm, May 1973
    • 1 Edición
    • Kjell Fuxe + 2 más
    • Inglés
    Dynamics of Degeneration and Growth in Neurons is a collection of papers presented at the International Symposium on the Dynamics of Degeneration and Growth in Neurons, held in Stockholm, Sweden, on May 16-18, 1973. Contributors explore the dynamics of degeneration and growth of central and peripheral neurons, touching on a wide range of topics such as the neurotoxic action of 6-hydroxy-dopa on central catecholamine neurons; axonal transport of proteins in growing and regenerating neurons; and collateral reinnervation in the central nervous system. Comprised of 50 chapters, this volume begins with an overview of degeneration processes in central and peripheral neurons. Results of microfluorimetric and neurochemical studies on degenerating and regenerating adrenergic nerves are presented. The next section is devoted to axoplasmic transport as a mechanism for axonal support and growth and includes chapters dealing with the effects of degeneration and axoplasmic transport blockade on synaptic ultrastructure, function, and protein composition; the role of axoplasmic flow in trophism of skeletal muscle; and proximodistal transport of acetylcholine in peripheral cholinergic neurons. The remaining chapters discuss the nerve growth factor receptor and its specific binding in sympathetic ganglia; the noradrenergic innervation of cerebellar Purkinje cells; and the possible role of brain and peripheral monoamines in the ontogenesis of normal and drug-induced responses in the immature mammal. This book will be of interest to physiologists and neurologists.

  • Applications of Holography and Optical Data Processing

    Proceedings of the International Conference, Jerusalem, August 23-26, 1976
    • 1 Edición
    • E. Marom + 2 más
    • Inglés
    Applications of Holography and Optical Data Processing contains the proceedings of the International Conference on Applications of Holography and Optical Data Processing, held in Jerusalem in August 1976. The conference is attended by eminent scientists in the field of optics, characterized by high-level scientific presentations and discussions. The collection is a representation of research on the cutting edge of applied and theoretical optics. The four-day meeting covers topics on holographic applications in medicine, interferometry, display, storage, and retrieval, as well as image processing, measuring techniques, spectroscopy, and recording materials and devices. The participants of the conference believe in the promising future of research on Optical Data Processing as long as techniques are complemented by electronic support. The book will be of value to electronics engineers, technicians, computer scientists, and computer engineers.

  • Calculations in Fundamental Physics

    Mechanics and Heat
    • 1 Edición
    • T. Heddle
    • N. Hiller
    • Inglés
    Calculations in Fundamental Physics, Volume I: Mechanics and Heat focuses on the mechanisms of heat. The manuscript first discusses motion, including parabolic, angular, and rectilinear motions, relative velocity, acceleration of gravity, and non-uniform acceleration. The book then discusses combinations of forces, such as polygons and resolution, friction, center of gravity, shearing force, and bending moment. The text looks at force and acceleration, energy and power, and machines. Considerations include momentum, horizontal or vertical motion, work and energy, pulley systems, gears and chains, and rotation and power. Elasticity, expansion and temperature, and static fluids are also discussed. The manuscript examines ideal gases, quantity of heat, centripetal acceleration, and rotary inertia. Topics include change of density, constant temperature, specific and latent heat, and gravitation and circular orbits. The text also explains simple harmonic motion, transfer of heat, molecular theory of gases and vapors, thermodynamics, and fluid flow. The book is a valuable source of information for readers interested in the mechanisms of heat.

  • Advances in High Voltage Insulation and Arc Interruption in SF6 and Vacuum

    • 1 Edición
    • V. N. Maller + 1 más
    • Inglés
    Advances in High Voltage Insulation and Arc Interruption in SF6 and Vacuum deals with high voltage breakdown and arc extinction in sulfur hexafluoride (SF6) and high vacuum, with special emphasis on the application of these insulating media in high voltage power apparatus and devices. The design and developmental aspects of various high voltage power apparatus using SF6 and high vacuum are highlighted. This book is comprised of eight chapters and opens with a discussion on electrical discharges in SF6 and high vacuum, along with the properties and handling of SF6 gas. The following chapters focus on high voltage breakdown and arc interruption in SF6 and in vacuum; various types of SF6 gas insulated circuit breakers and metal enclosed switchgear, together with their design considerations; and application of SF6 gas in some insulated equipments. The final chapter addresses the various problems relating to the development of vacuum switchgear and considers some solutions that led to the successful development of vacuum interrupters of acceptable quality. This monograph will be of direct use to engineers in industry and those with electricity supply and utility establishments, as well as graduate students and research workers who want to familiarize themselves with the investigations and the results on the various phenomena relating to SF6 and high vacuum and their practical applications.

  • Quantum Mechanics

    A Shorter Course of Theoretical Physics
    • 1 Edición
    • L D Landau + 1 más
    • Inglés
    Quantum Mechanics deals with various aspects of quantum mechanics and covers topics ranging from the uncertainty principle and the principle of superposition to conservation laws, Schrödinger's equation, and perturbation theory. Spin, radiation, and the identity of particles are also discussed, along with the atom, the diatomic molecule, elastic and inelastic collisions, and Feynman diagrams. Comprised of 16 chapters, this volume begins with an overview of non-relativistic quantum theory and the basic concepts of quantum mechanics such as the principles of uncertainty and superposition, operators, and the density matrix. Subsequent chapters deal with conservation laws in quantum mechanics; Schrödinger's equation and general properties of its solutions; perturbations independent of time and dependent on time; spin and the spin operator; and the principle of indistinguishability of similar particles. The atom and its electron states are also examined, together with diatomic molecules; elastic and inelastic collisions; photons and electrons; Dirac's equation; and particles and antiparticles. The final chapter is devoted to Feynman diagrams, paying particular attention to the scattering matrix, radiative corrections, and radiative shift of atomic levels. This book will be of interest to physicists.

  • Steroid Dynamics

    Proceedings of the Symposium on the Dynamics of Steroid Hormones Held in Tokyo, May, 1965
    • 1 Edición
    • Gregory Pincus + 2 más
    • Inglés
    Steroid Dynamics compiles papers presented at the Symposium on the Dynamics of Steroid Hormones held in Tokyo, in May 1965. This compilation discusses the effect of LH and ACTH on production and excretion of testosterone in vivo, estrogen receptors in target tissues, and influence of morphine on corticoid production. The binding of steroids to follicular fluid proteins, conjugation and excretion of aldosterone, and active cholesterol pool for corticodogenesis in the rat adrenal are also elaborated. This book likewise covers the dynamics of steroid hormone distribution in the body, biosynthesis of steroids in testicular tissue in vitro, and isotopic dilution methods for the estimation of rates of secretion of the steroid hormones. This publication is a good reference for endocrinologists, biochemists, and medical practitioners interested in steroid dynamics.

  • Electrical Analogues of Pin-Jointed Systems

    International Series of Monographs on Electronics and Instrumentation
    • 1 Edición
    • K. K. Keropyan + 2 más
    • Inglés
    Electrical Analogues of Pin-Jointed Systems is a compilation of papers from members of the Rostov-on-Don Civil Engineering Institute and of the Taganrog Radiotechnical Institute, dealing with the statics and dynamics of buildings. This collection addresses the problems encountered in building mechanics. This book also discusses the principles of electrical analogues used in calculating solutions to problems involving static and dynamic structural formations. The different methods of electrical analogues are explained such as solving problems related to the resistance of materials. This text then shows the calculations using the equation of three bi-moments for solid beams with different rigidities, as well as other circuits used to calculate stresses in all parts of a static framework. In particular, the text notes that a circuit is capable of calculating the size of the current flowing in other parts of the system the stress found in the main framework. This book further notes the electrical analogues using four terminal networks and for determining the effects of temperature on structural beams and frameworks. For practical considerations, the text points out the analogue built by the Taganrog Radiotechnical Institute . Of interest is an electrical circuit that mimics a beam being shifted out of line during stress encountered from unwanted motion. When the foundation causes shifting of the pillars of a structure, the text explains how the degree of deflection can be calculated by using a formula relevant to electrical analogue use. This collection of articles will prove useful to structural engineers, researchers in structural mechanics, and scientists involved in dynamics and physics.

  • Inelastic Light Scattering

    Proceedings of the 1979 US-Japan Seminar held at Santa Monica, California, USA, 22-25 January 1979
    • 1 Edición
    • Elias Burstein + 1 más
    • Inglés
    Inelastic Light Scattering documents the proceedings of the 1979 US-Japan Seminar held at Santa Monica, California, USA, 22-25 January 1979. The seminar is one of a continuing series of seminars on ""Current Developments in Science,"" which are jointly sponsored by the United States National Science Foundation and the Japan Society for the Promotion of Science as part of the United States-Japan Cooperative Science Program. These joint seminars provide a medium for personal interactions between theorists and experimentalists from the two countries. The aim of the joint seminar on inelastic light scattering was to organize a program which would focus on important theoretical and experimental developments that reflect the complementarity of Japanese and US efforts in this important field. The topics covered by the papers presented at the seminar include resonant Raman scattering and luminescence; light scattering under intense illumination; resonant Brillouin scattering and non-local optics; enhanced Raman scattering by molecules adsorbed in metals; inelastic light scattering in superionic conductors and in glasses; Raman scattering by soft modes in IV-VI compound semiconductor and ferroelectrics; and central peaks in inelastic light scattering at structural phase transitions.

  • Free Vibrations of Circular Cylindrical Shells

    • 1 Edición
    • Anthony E. Armenàkas + 2 más
    • Inglés
    Free Vibrations of Circular Cylindrical Shells deals with thin-walled structures that undergo dynamic loads application, thereby resulting in some vibrations. Part I discusses the treatment of problems associated with the propagation of plane harmonic waves in a hollow circular cylinder. In such search for solutions, the text employs the framework of the three-dimensional theory of elasticity. The text explains the use of tables of natural frequencies and graphs of representative mode shapes of harmonic elastic waves bounding in an infinitely long isotropic hollow cylinder. The tables are found to be useful as they can be used to check validity and provide estimates of the range of applicability of various shell theories. The purpose of the frequency equation and that of the numerical computations likewise are considered. The book includes a computer program written in the FORTRAN language to show how it is used in the computations, except in cases when H (the thickness of shell) and L (axial half of wavelength) result in extremely small values. Part II consists of related tables and graphs. Physicists, engineers, students, and researchers in advanced sciences will find this book of interest.

  • Methods of Statistical Physics

    International Series in Natural Philosophy
    • 1 Edición
    • A. I. Akhiezer + 1 más
    • D. ter Haar
    • Inglés
    Methods of Statistical Physics is an exposition of the tools of statistical mechanics, which evaluates the kinetic equations of classical and quantized systems. The book also analyzes the equations of macroscopic physics, such as the equations of hydrodynamics for normal and superfluid liquids and macroscopic electrodynamics. The text gives particular attention to the study of quantum systems. This study begins with a discussion of problems of quantum statistics with a detailed description of the basics of quantum mechanics along with the theory of measurement. An analysis of the asymptotic behavior of universal quantities is also explained. Strong consideration is given to the systems with spontaneously broken system. Theories such as the kinetic theory of gases, the theory of Brownian motion, the theory of the slowing down of neutrons, and the theory of transport phenomena in crystals are discussed. The book will be a useful tool for physicists, mathematicians, students, and researchers in the field of statistical mechanics.

  • Time-Of-Flight Mass Spectrometry

    Based on the Proceedings of the First European Symposium on Time-Of-Flight Mass Spectrometry Held at the University of Salford, July 3–5, 1967
    • 1 Edición
    • D. Price + 1 más
    • Inglés
    Time-of-Flight Mass Spectrometry contains the proceedings of the First European Symposium on Time-of-flight Mass Spectrometry held at the University of Salford in the UK on July 3-5, 1967. The papers focus on time-of-flight mass spectrometry and its chemical applications, from flash photolysis and pyrolysis reactions to shock wave reactions and high-temperature studies of inorganic solids. This book is comprised of nine chapters and opens with an introduction to the MA-1 and other time-of-flight mass spectrometers, followed by their applications to studies of chemical reactions such as flash photolysis and pyrolysis reactions, reactions involving shock waves, and high-temperature studies of inorganic solids. Subsequent chapters explore fast recording techniques for time-resolved mass spectrometry; detection of the NH2 free radical and other ammoniacal complexes in the electrical discharge decomposition of ammonia gas; and reactions of ions with molecules in the gas phase and the sputtering of solid surfaces by ion bombardment. The use of a time-of-flight mass spectrometer in experimental investigations of negative ions is also described. This monograph will be a valuable resource for users of a time-of-flight mass spectrometer and allow non-users to become acquainted with its applications and advantages.

  • Basic Principles of Electronics

    Thermionics
    • 1 Edición
    • J. Jenkins + 1 más
    • Inglés
    Basic Principles of Electronics, Volume I: Thermionics covers topics related to thermionic devices. The book starts by providing a physical background about electronics, including structure of matter, ionic, chemical and covalent combination, crystalline structure, conductors and insulators, and thermionic emission. The text then discusses electron dynamics; the characteristics and properties of electrons in solids; electron emission; and thermionic emission in a vacuum diode or triode. The development of the vacuum triode; gas-filled valves; and power amplifiers are also considered. The book further tackles oscillators intended to give a sinusoidal output as well as electronic measuring equipment. Students taking electronics for physics courses will find the book useful.

  • The Pseudo-Spin Method in Magnetism and Ferroelectricity

    International Series of Monographs in Natural Philosophy
    • 1 Edición
    • Ljubisav Novaković
    • D. Ter Harr
    • Inglés
    The Pseudo-Spin Method in Magnetism and Ferroelectricity deals with the pseudo-spin method in magnetism and ferroelectricity, with emphasis on three important ordered systems: ferromagnets, antiferromagnets, and hydrogen-bonded ferroelectrics. Each system is analyzed in three important temperature regions: low temperatures, the critical region, and high temperatures. The presented mathematical method is predominantly analytical in the sense that all crucial physical quantities are expressed in terms of temperature or the reciprocal lattice vectors. Comprised of four chapters, this volume begins with an introduction to Basic concepts in lattice dynamics, touching on topics such as symmetry groups, light scattering, and the spectrum of ionic crystals. The discussion then turns to phase transitions and covers magnetism, ferroelectricity, and the Ising model with a transverse field. Magnetic elementary excitations are then considered, paying particular attention to the second quantization method; the exchange interaction; the Heisenberg ferromagnet in a boson representation; and high-temperature static susceptibility. The final chapter is devoted to the Green functions and their perturbation expansion; ferromagnetism at low temperatures; antiferromagnetism and ferroelectric modes; and high-temperature dielectric susceptibilities. This book will be of interest to physicists as well as students and researchers in physics.

  • Quantum Electrodynamics

    • 1 Edición
    • Iwo Białynicki-Birula + 1 más
    • D. Ter Haar
    • Inglés
    Quantum Electrodynamics focuses on the formulation of quantum electrodynamics (QED) in its most general and most abstract form: relativistic quantum field theory. It describes QED as a program, rather than a closed theory, that rests on the theory of the quantum Maxwellian field interacting with given (external) classical sources of radiation and on the relativistic quantum mechanics of electrons interacting with a given (external) classical electromagnetic field. Comprised of eight chapters, this volume begins with an introduction to the fundamental principles of quantum theory formulated in a general, abstract fashion. The following chapters consider non-relativistic quantum mechanics; the theory of the electromagnetic field interacting with given sources of radiation; the quantum mechanics of particles; and the relativistic quantum mechanics of mutually non-interacting electrons moving in a given electromagnetic field. The formulation of QED is then described, paying particular attention to perturbation theory and Feynman diagrams and electron-photon processes. The final two chapters deal with renormalization theory and applications of QED. This book is addressed to readers who are familiar with quantum mechanics and classical electrodynamics at the level of university courses.

  • Applications of Nuclear and Radiochemistry

    • 1 Edición
    • Richard M. Lambrecht + 1 más
    • Inglés
    Applications of Nuclear and Radiochemistry is a collection of articles focusing on contemporary applied research on radioactive isotopes. The monograph is based on the Second Chemical Congress of the North American Continent, held at Las Vegas, Nevada in August 1980. The book contains articles on developments in nuclear chemistry and radiochemistry, emphasizing the topic of radiopharmaceutical chemistry. The text is composed of two parts, wherein the first part is comprised of papers dealing with advances in the production of radionuclides for nuclear medicine, in the synthesis of labeled pharmaceuticals, and in the design and use of specific diagnostic agents. These sections cover research areas on machines used for research, such as compact accelerators, positron emission, and single photon tomographs. Emphasis is given to the radiochemistry and design of radiopharmaceuticals for receptor studies and for determining physiological function and metabolism of the brain, heart, and tumors. The second part examines contemporary advances including the impact of radiochemistry in China pertaining to the fallout from Chinese nuclear tests. This part also contains a section covering a list of uncommon topics. The text is of interest to nuclear scientists, academicians in the field of radiology and radiochemistry, researchers in nuclear medicine, nuclear engineers, and environmental researchers.

  • Worked Problems in Heat, Thermodynamics and Kinetic Theory for Physics Students

    The Commonwealth and International Library: Physics Division
    • 1 Edición
    • L. Pincherle
    • W. Ashhurst + 1 más
    • Inglés
    Worked Problems in Heat, Thermodynamics and Kinetic Theory for Physics Students is a complementary to textbooks in physics. This book is a collection of exercise problems that have been part of tutorial classes in heat and thermodynamics at the University of London. This collection of exercise problems, with answers that are fully worked out, deals with various topics. This book poses problems covering the definition of temperature such as calculating the assigned value of the temperature of boiling water under specific conditions. This text also gives example of problems dealing with the first law of thermodynamics and with the definition of thermal capacities. Some practical questions such as problems dealing with thermal engines are presented. This book then discusses problems using the energy equation, as well as asking the student to derive a general equation of state of a material satisfying a specific condition. This text challenges the student to use a T-S diagram to calculate the efficiency of a reversible cycle under certain conditions. Several other problems concern the Joule and Joule-Kelvin effects, low temperature physics, and heat conduction. This review material can be helpful for students of physics, thermodynamics, and related subjects. It can also be used by teachers of physics.

  • Applied Geophysics U.S.S.R.

    • 1 Edición
    • Nicholas Rast
    • Inglés
    Applied Geophysics, U. S. S. R. illustrates a collection of selected papers that demonstrates methods in geophysical research. The journal presents the developments, done by Russian scientists, in the field of geophysics with bias toward the application of geophysical methods to the search for oil. The compendium is divided into four parts encompassing 17 chapters. The articles are grouped into topics that discuss seismic methods, gravimetry, electrical sonde methods, and geophysical methods of logging. Certain chapters focus on simplified methods for determining the intensities of purely longitudinal waves and how the different parameters of the medium affect their frequency rate. The methods for measuring the force of gravity at sea; methods of electrical exploration in inaccessible regions of Siberia; and studies on use of radioactive logging in bore-hole investigations are covered as well. The book will be of interest to geophysicists, geologists, applied physicists, and students of physics and geology.

  • Solid Lubricants and Surfaces

    • 1 Edición
    • E. R. Braithwaite
    • Inglés
    Solid Lubricants and Surfaces deals with the theory and use of solid lubricants, particularly in colloidal form. Portions of this book are devoted to graphite and molybdenum disulfides, which are widely used solid lubricants in colloidal form. An extensive literature on the laboratory examination of hundreds of solids as potential lubricants is also provided in this text. Other topics discussed include the metals and solid lubricants; techniques for examining surfaces; other solid lubricants; metal shaping; and industrial uses of solid-lubricant dispersions. This publication is beneficial to equipment designers who know the value of solid lubricants and works engineers interested in the background science underlying solid-lubricant. This text is mainly useful to senior undergraduates who plan to enter the chemical engineering industries.

  • Spin Arrangements and Crystal Structure, Domains, and Micromagnetics

    A Treatise on Modern Theory and Materials
    • 1 Edición
    • George T. Rado + 1 más
    • Inglés
    Spin Arrangements and Crystal Structure, Domains, and Micromagnetics deals with cooperative phenomena characterized by ordered arrangements of magnetic moments subject to strong mutual interactions. The emphasis is on the ferromagnetism, ferrimagnetism, and antiferromagnetism of magnetically ordered materials such as insulators and metals. Both theoretical and experimental points of view are presented. Comprised of 12 chapters, this volume begins with an introduction to magnetism and crystal structure in nonmetals, followed by an evaluation of exchange interactions from experimental data. Subsequent chapters focus on the theory of neutron scattering by magnetic crystals; spin configuration of ionic structures; spin arrangements in metals; and permanent magnet materials. Fine particles, thin films, and exchange anisotropy are also considered, with particular reference to the effects of finite dimensions and interfaces on the basic properties of ferromagnets. The book also examines micromagnetics; domains and domain walls; the structure and switching of permalloy films; magnetization reversal in nonmetallic ferromagnets; and preparation and crystal synthesis of magnetic oxides. This book will be a useful resource for professionals and students with physics or chemistry backgrounds.

  • Foundations of Classical and Quantum Statistical Mechanics

    International Series of Monographs in Natural Philosophy
    • 1 Edición
    • R. Jancel
    • D. ter Haar
    • Inglés
    Foundations of Classical and Quantum Statistical Mechanics details the theoretical foundation the supports the concepts in classical and quantum statistical mechanics. The title discusses the various problems set by the theoretical justification of statistical mechanics methods. The text first covers the the ergodic theory in classical statistical mechanics, and then proceeds to tackling quantum mechanical ensembles. Next, the selection discusses the the ergodic theorem in quantum statistical mechanics and probability quantum ergodic theorems. The selection also details H-theorems and kinetic equations in classical and quantum statistical mechanics. The book will be of great interest to students, researchers, and practitioners of physics, chemistry, and engineering.

  • Solar Energy Applications in Houses

    Performance and Economics in Europe
    • 1 Edición
    • F Jäger
    • Inglés
    Solar Energy Applications in Houses: Performance and Economics in Europe provides information on the state of development of solar space and water heating technology and on the influence of climatic and economic factors on the attractiveness of solar systems. The book discusses the aspects of climate relevant to solar system and house designs; the impacts of the different European climates on the thermal design and heating requirements of individual houses; and the passive solar energy use in buildings. The text also describes the components of active solar energy systems; the performance of active solar energy systems; and the economics of solar space and water heating. The supporting activities for solar energy systems and other energy-saving technologies implemented by governments, companies, energy supply utilities, solar societies and the Commission of the European Communities are also considered. The book will be invaluable to potential buyers or owners of systems who need practical information on the technical and economic possibilities of domestic solar energy use in the various countries of the European Communities. The information is also important for those people in government, administration, industry and research institutions who are involved in assessing solar energy applications, in planning for the future energy supply, in developing support measures for the introduction of energy-saving methods and in marketing solar hardware.

  • Stereodynamics of Molecular Systems

    Proceedings of a Symposium Held at the State University of New York at Albany, 23-24 April 1979
    • 1 Edición
    • Ramaswamy H. Sarma
    • Inglés
    Stereodynamics of Molecular Systems covers the proceedings of a symposium held at the State University of New York at Albany, on 23-24 April 1979. The book focuses on the stereodynamics of molecules and ions and nucleic acid structure. The contributions tackle spectroscopy, crystallography, perturbations, and electron-transfer reactions. The selection first offers information on nuclear magnetic resonance spectroscopy chemical shifts, coupling constants, and molecular geometry, including chemical shifts, bond coupling constants, and constitutional features of nucleic acids. The book then takes a look at nuclear magnetic resonance spectroscopy stereodynamics of small molecules; nuclear magnetic resonance spectroscopy solution dynamics of polymer chains; and single crystal crystallography. The publication evaluates the steric effects on electron-transfer reactions of sulfonamides; effects of isotopic perturbation on NMR spectra; and conformational mobility of the backbone of cyclic tripeptides. The book also discusses accessible surface areas of nucleic acids and their relation to folding, conformational transition, and protein recognition. Topics include polarity of exposed atoms, surface of DNA double helices, transfer RNA, and calculation of “static“ accessible surface area. The selection is a dependable reference for readers interested in the stereodynamics of molecules and ions and nucleic acid structure.

  • Electromagnetic Waves in Stratified Media

    Revised Edition Including Supplemented Material
    • 1 Edición
    • James R. Wait
    • A. L. Cullen + 2 más
    • Inglés
    International Series of Monographs in Electromagnetic Waves, Volume 3: Electromagnetic Waves in Stratified Media provides information pertinent to the electromagnetic waves in media whose properties differ in one particular direction. This book discusses the important feature of the waves that enables communications at global distances. Organized into 13 chapters, this volume begins with an overview of the general analysis for the electromagnetic response of a plane stratified medium comprising of any number of parallel homogeneous layers. This text then explains the reflection of electromagnetic waves from planar stratified media. Other chapters consider the oblique reflection of plane electromagnetic waves from a continuously stratified medium. This book discusses as well the fundamental theory of wave propagation around a sphere. The final chapter deals with the theory of propagation in a spherically stratified medium. This book is a valuable resource for electrical engineers, scientists, and research workers.

  • Structure and Properties of Inorganic Solids

    International Series of Monographs in Solid State Physics
    • 1 Edición
    • Francis S. Galasso
    • Balak Das Kurmi + 1 más
    • Inglés
    Structure and Properties of Inorganic Solids, Volume 7 is a reference book that describes the structure of metals, intermetallics, halides, hydrides, carbides, borides, and other inorganic phases as well as some of their properties. Among the inorganic solids discussed are CsCl, NaCl, ZnS, NiAs, perovskite, spinel, corundum, beta tungsten, and graphite. This volume is comprised of 12 chapters and opens with an overview of crystallography and material properties, followed by a discussion on the structural relationships of elemental solids. The reader is then introduced to the ZnS, NiAs, CsCl, NaCl, graphite, perovskite, spinel, corundum, and beta tungsten type structures. The final chapter offers a brief summary of the structure of various types of inorganic compounds covered in the text. This book is written to meet the needs of teachers of advanced undergraduate and graduate courses and of researchers in the various disciplines that make up the field of materials sciences. It will also be of interest to those with diverse backgrounds such as engineering, chemistry, metallurgy, physics, ceramics, and mineralogy.

  • The Application of Group Theory in Physics

    • 1 Edición
    • G.Ya. Lyubarskii
    • Inglés
    The Application of Group Theory in Physics is a 17-chapter text based on a course of lectures concerning the principles, concepts, and application of group theory in physics, given at the Gorki University in Kharkov. This text presents first the parts of the theory of representations of finite and continuous groups that are most important in application. Considerable chapters cover the groups of theory of interest in theoretical physics and demonstrate the principles according to which the abstract concepts and the theorems of representation theory are applied in theoretical physics. The remaining chapters provide representations of the rotation group and the Lorentz group. The closing part of this work contains tables of the detailed description of the 230 space groups and for the characters of certain groups. This book is intended primarily for physicists specializing in theoretical physics

  • Special Topics

    • 1 Edición
    • H. S. W. Massey + 2 más
    • Inglés
    Applied Atomic Collision Physics, Volume 5: Special Topics deals with topics on applications of atomic collisions that were not covered in the first four volumes of the treatise. The book opens with a chapter on ultrasensitive chemical detectors. This is followed by separate chapters on lighting, magnetohydrodynamic electrical power generation, gas breakdown and high voltage insulating gases, thermionic energy converters, and charged particle detectors. Subsequent chapters deal with the operation of multiwire drift and proportional chambers and streamer chambers and their use in high energy physics experiments; photoelectron spectroscopy of negative ions and the chemical information that can be obtained from such studies; and the determination of intermolecular potentials. Also discussed are studies on the determination of ion molecular potential curves using photodissociative processes; determination of negative ion thermo chemical data using ion-neutral reactions; gas-phase chemical reactions; collision phenomena in electrical discharge lamps; and military applications of atomic and molecular physics.

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