Springer springer dez 1972 (71 risultati)
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Taschenbuch. Condizione: Neu. Neuware - Studies of the magnetic anomalies paralleling ocean ridges have furnished partisans of continental drift with decisive arguments. To take stock of this important question, my colleague Thellier and I decided in the early summer of 1967 to make it the subject of the annual seminar on Earth…physics for the school year 1967-68. Although research was still developing rapidly, the General Assembly of the International Union of Geodesy and Geophysics held in Switzerland in September, particularly some of the meetings in Zurich under the auspices of the International Committee for the Upper Mantle, appeared to confirm that we had made no important omissions. At the con clusion of the seminar, where I had been responsible for most of the lectures, I resolved to write the present volume for the non-specialized scientific reader. The project turned out to be a good deal more ambitious than I had thought. It is quite an undertaking nowadays to try to survey a rapidly growing subject, first of all because of the difficulty of gathering material; publication delays are now nearing one year, with the result that specialists communicate largely through a selective distribution of reports, as well as verbally in frequent colloquia. I warmly thank those who helped me in getting unpublished literature, especially Xavier Le Pichon. Even so, some essential work came to my knowledge only lately.
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Taschenbuch. Condizione: Neu. Neuware - The usual book on the theory of spectral line formation begins with an in-depth dis cussion of radiation transfer, including the elegant methods of obtaining analytical solutions for special cases, and of the physics of line broadening. Neither of those features will be found in this book.… It is assumed that the reader is already familiar with the essentials of transport theory and of line broadening and is ready to investi gate some of the particular applications of the theory to the flow of line photons through the outer layers of a star, or other tenuous media. The main thrust of this book is toward the compilation and presentation of a vast quantity of computational material available to the author in the form of computer output. The material presented represents a highly filtered sample of the published work in this subject plus an extensive set of previously unpublished results. To present large quantities of computer output in an intelligible and efficient way is a difficult task, for which I have found no really satisfactory solution. Chapters III and IV, in particular, contain almost exclusively this type of presentation. The reader may find these chapters somewhat tedious because of the level of condensation of the material. I have tried to reach a reasonable balance between over condensation and excessive detail, which in the long run may be irrelevant.
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Da: BuchWeltWeit Ludwig Meier e.K., Bergisch Gladbach, GermaniaBuchWeltWeit Ludwig Meier e.K.
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Taschenbuch. Condizione: Neu. This item is printed on demand - it takes 3-4 days longer - Neuware -Analytic capacity.- The cauchy transform.- Hausdorff measure.- Some examples.- Applications to approximation. 148 pp. Englisch.
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Da: BuchWeltWeit Ludwig Meier e.K., Bergisch Gladbach, GermaniaBuchWeltWeit Ludwig Meier e.K.
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Taschenbuch. Condizione: Neu. This item is printed on demand - it takes 3-4 days longer - Neuware -Moyennes invariantes et proprietes du point fixe.- Espaces homogenes moyennables et proprietes de Reiter.- Espaces homogenes moyennables et representations quasi-regulieres.- Moyennes invariantes et Representations des produits sem…i-directs.- Complements divers. 120 pp. Französisch.
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Taschenbuch. Condizione: Neu. This item is printed on demand - it takes 3-4 days longer - Neuware -Ensembles Et Fonctions Analytiques.- Capacit¿- Calibres.- Noyaux Capacitaires.- ¿aisseurs.- Mesures De Hausdorff. 140 pp. Französisch.
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Da: BuchWeltWeit Ludwig Meier e.K., Bergisch Gladbach, GermaniaBuchWeltWeit Ludwig Meier e.K.
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Taschenbuch. Condizione: Neu. This item is printed on demand - it takes 3-4 days longer - Neuware -Manifolds with few preiodic homeomorphisms.- Centralizers of rootless integral matrices.- Manifolds with no periodic maps.- Injective operations of the toral groups II.- Holomorphic seifert fibering.- Holomorphically injective comp…lex toral actions.- Derived actions.- Group action and betti sheaf.- On infinite cyclic actions on contractible open 3-manifolds and strong irreducibility. 348 pp. Englisch.
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Taschenbuch. Condizione: Neu. This item is printed on demand - it takes 3-4 days longer - Neuware -Tripartite graphs to analyze the interconnection of networks.- Minimal regular major maps with proper 4-rings.- Total graphs.- A census of ball and disk dissections.- Network models for maximization of heat transfer under weight co…nstraints.- The 'Graph Theory' of the Greek Alphabet.- The number of partial order graphs.- Estimating the connectivity of a graph.- On problems of Moser and Hanson.- The role of graph theory in some sieve arguments of probability theory.- The pfaffian and 1-factors of graphs II.- On embedding graphs in squashed cubes.- Crossing numbers of graphs.- Recent results on generalized Ramsey theory for graphs.- Line graphs of triangleless graphs and iterated clique graphs.- Line digraphs.- On limit points of spectral radii of non-negative symmetric integral matrices.- Which generalized prisms admit H-circuits .- The chromatic number of triangle-free graphs.- Planarity of Cayley diagrams.- Hamiltonian and Eulerian properties of entire graphs.- Two problems on random trees.- On the girth and genus of a graph.- Variations of the cell growth problem.- On the toughness of a graph.- On the cyclic connectivity of planar graphs.- Some recent results in chemical enumeration.- Upper and lower imbeddable graphs.- Triangular embeddings of graphs.- Progress on the problem of eccentric hosts.- Magic sets.- The strong perfect graph conjecture and an application to a municipal routing problem.- On graphical regular representations of Cn ¿Q.- Planar graphs and matroids. 344 pp. Englisch.
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Taschenbuch. Condizione: Neu. This item is printed on demand - it takes 3-4 days longer - Neuware -The main purpose of part I of these notes is to develop for a ring R a functional notion of R-completion of a space X. For R=Zp and X subject to usual finiteness condition, the R-completion coincides up to homotopy, with the p-prof…inite completion of Quillen and Sullivan; for R a subring of the rationals, the R-completion coincides up to homotopy, with the localizations of Quillen, Sullivan and others. In part II of these notes, the authors have assembled some results on towers of fibrations, cosimplicial spaces and homotopy limits which were needed in the discussions of part I, but which are of some interest in themselves. 356 pp. Englisch.
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Taschenbuch. Condizione: Neu. This item is printed on demand - it takes 3-4 days longer - Neuware -Invariants for semi-free s1-actions.- Topological s1 and Z2k actions on spheres.- Characteristic invariants of free differentiable actions of S1 and S3 on homotopy spheres.- Differentiable pseudo-free circle actions on homotopy sev…en spheres.- Semifree circle actions with twisted fixed point sets.- Z2-torus actions on homotopy spheres.- Free and semi-free smooth actions of S1 and S3 on homotopy spheres.- Cobordism of involutions revisited.- Bemerkungen ¿er ¿uivariante Euler-klassen.- Existence of fixed points.- Cobordism of line bundles with restricted characteristic class.- Unitary bordism of monogenic groups and isometries.- Quillen's theorem for MU.- Equivariant characteristic numbers.- Cobordism of diffeomorphisms of (k-1)-connected 2k-manifolds.- The index of manifolds with toral actions and geometric interpretations of the ( , (S1, Mn)) invariant of atiyah and singer.- Involutions on homotopy complex projective spaces and related topics.- On the homology of weighted homogeneous manifolds.- Equivariant resolution of singularities with C\* action.- Strange circle actions on products of odd dimensional spheres, and rational homotopy.- Examples of actions on manifolds almost diffeomorphic to Vn+1,2.- On unitary and sympletic knot manifolds.- A classification of 6-manifolds with free S1 actions.- SU(n) actions on manifolds with vanishing first and second integral pontrjagin classes.- On the splitting principle and the geometric weight system of topological transformation groups I.- Equivariant singular homology and cohomology for actions of compact lie groups.- Cyclic branched covers and o(n)-manifolds.- Degree of symmetry of closed manifolds.- Transfer homomorphisms of whitehead groups of some cyclic groups, II.- Surgery on four-manifolds and topological transformation groups. 468 pp. Englisch.
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Taschenbuch. Condizione: Neu. This item is printed on demand - it takes 3-4 days longer - Neuware -This volume is intended to provide a comprehensive treatment of recent developments in methods of perturbation for nonlinear systems of ordinary differ ential equations. In this respect, it appears to be a unique work. The main goa…l is to describe perturbation techniques, discuss their ad vantages and limitations and give some examples. The approach is founded on analytical and numerical methods of nonlinear mechanics. Attention has been given to the extension of methods to high orders of approximation, required now by the increased accuracy of measurements in all fields of science and technology. The main theorems relevant to each perturbation technique are outlined, but they only provide a foundation and are not the objective of these notes. Each chapter concludes with a detailed survey of the pertinent literature, supplemental information and more examples to complement the text, when necessary, for better comprehension. The references are intended to provide a guide for background information and for the reader who wishes to analyze any particular point in more detail. The main sources referenced are in the fields of differential equations, nonlinear oscillations and celestial mechanics. Thanks are due to Katherine MacDougall and Sandra Spinacci for their patience and competence in typing these notes. Partial support from the Mathematics Program of the Office of Naval Research is gratefully acknowledged. 384 pp. Englisch.
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Taschenbuch. Condizione: Neu. This item is printed on demand - it takes 3-4 days longer - Neuware -These are the revised notes of a course for graduate students and some seminar talks which I gave at the University of Rochester during Fall Term 1969/70. They would not have been written without the encouragement and the aid which… I received, during all stages of the work, by friends from Rochester, Rio de Janeiro, and Bonn. I wish to thank all of them: Barbara Grabkowicz encouraged me to write these notes in English and read carefully parts of a preliminary manuscript, as did Gervasio G. Bastos, Yves A. E. Lequain, Walter Strubel, and Antonio J. Engler. Many valuable suggestions were given me by Yves A. E. Lequain, and several improvements of theorems and proofs are due to him. I am particularly grateful to Linda C. Hill for her criticism in reading the last version and for improving and smoothing many of my formulations. Last but not least I thank Wilson Goes for the excellent typing. Most of this book was elaborated when I stayed in Rio de Janeiro as a Visiting Professor at IMPA (Institute for Pure and Applied Mathematics) and as a Pesquisador-Conferencista of CNPq (National Research Council). Thanks are also due to these institu tions. 256 pp. Englisch.
Lingua: Inglese
Editore: Springer Berlin Heidelberg, Springer Dez 1972, 1972
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Taschenbuch. Condizione: Neu. This item is printed on demand - it takes 3-4 days longer - Neuware -Quantum chemistry of nonbenzenoid cyclic conjugated hydrocarbons.- Some formal properties of the kinetics of pentacoordinate stereoisomerizations.- Radiochemical transformations and rearrangements in organometallic compounds. 120 p…p. Englisch.
Lingua: Inglese
Editore: Springer Berlin Heidelberg, Springer Berlin Heidelberg Dez 1972, 1972
Serie: Advances in Anatomy, Embryology and Cell Biology, Libro 45 di 173. Libro 45 di 173 - Advances in Anatomy, Embryology and Cell Biology
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Taschenbuch. Condizione: Neu. This item is printed on demand - it takes 3-4 days longer - Neuware -The earliest studies on the regional distribution of acetylcholinesterase (AChE) within the central nervous system were based on the determination of the amount of CO liberated by homogenates of selected areas in the presence of an… ester of 2 choline and a bicarbonate buffer. Using this biochemical approach, Burgen and Chipman (1951) were able to establish that acetylcholinesterase is not evenly distributed within the central nervous system. They found that the cerebellum, the lateral geniculate body, and the striatum contained a high concentration of AChE. The high concentration of AChE in the striatum could be correlated with a higher rate of acetylcholine synthesis. However, this was not the case for the cerebellum, where acetylcholine synthesis was very low. Other in vitro studies have been aimed at establishing the regional distribution of the other two components of the cholinergic system, cholinacetylase (ChA) and acetylcholine (ACh). An equally asymetrical distribution for these substances has been established in vitro (MacIntosh, 1941 ; Feldberg and Mann, 1946; Feldberg and V ogt, 1948; MacIntosh and Oborin, 1953; Quastel, 1962; Mitchell, 1963; Krnjevic and Phillis, 1963; Aprison et al. , 1964; McLennan, 1964; Cohen, 1956). The in vitro determination of acetylcholinesterase (Koelle, 1950; Burgen and Chipman, 1951; Giacobini, 1959; Bennett et al. , 1966; Fahn and Cote, 1968; Miller et al. , 1969) presents the advan tage of permitting the use of a substrate like ACh which is a normally occurring ester of choline so that the establishment of enzyme specificity is less questionable. 56 pp. Englisch.
Lingua: Inglese
Editore: Springer Vienna Dez 1972, 1972
Serie: CISM International Centre for Mechanical Sciences, Libro 3 di 433. Libro 3 di 433 - CISM International Centre for Mechanical Sciences
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Taschenbuch. Condizione: Neu. This item is printed on demand - it takes 3-4 days longer - Neuware 232 pp. Englisch.
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Buch. Condizione: Neu. This item is printed on demand - it takes 3-4 days longer - Neuware -This is a study of the feudal nobles in the Latin Kingdom of Jerusalem; their status in Palestinian society, their lordships and their political ideas; and the development of these ideas as expressed in constitutional conflicts with kings… and regents from 1174 to 1277. 351 pp. Englisch.
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Taschenbuch. Condizione: Neu. This item is printed on demand - it takes 3-4 days longer - Neuware 196 pp. Deutsch.
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Taschenbuch. Condizione: Neu. This item is printed on demand - Print on Demand Titel. Neuware -Analytic capacity.- The cauchy transform.- Hausdorff measure.- Some examples.- Applications to approximation.Springer-Verlag KG, Sachsenplatz 4-6, 1201 Wien 148 pp. Englisch.
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Taschenbuch. Condizione: Neu. This item is printed on demand - Print on Demand Titel. Neuware -Tripartite graphs to analyze the interconnection of networks.- Minimal regular major maps with proper 4-rings.- Total graphs.- A census of ball and disk dissections.- Network models for maximization of heat transfer under weight constr…aints.- The 'Graph Theory' of the Greek Alphabet.- The number of partial order graphs.- Estimating the connectivity of a graph.- On problems of Moser and Hanson.- The role of graph theory in some sieve arguments of probability theory.- The pfaffian and 1-factors of graphs II.- On embedding graphs in squashed cubes.- Crossing numbers of graphs.- Recent results on generalized Ramsey theory for graphs.- Line graphs of triangleless graphs and iterated clique graphs.- Line digraphs.- On limit points of spectral radii of non-negative symmetric integral matrices.- Which generalized prisms admit H-circuits .- The chromatic number of triangle-free graphs.- Planarity of Cayley diagrams.- Hamiltonian and Eulerian properties of entire graphs.- Two problems on random trees.- On the girth and genus of a graph.- Variations of the cell growth problem.- On the toughness of a graph.- On the cyclic connectivity of planar graphs.- Some recent results in chemical enumeration.- Upper and lower imbeddable graphs.- Triangular embeddings of graphs.- Progress on the problem of eccentric hosts.- Magic sets.- The strong perfect graph conjecture and an application to a municipal routing problem.- On graphical regular representations of Cn × Q.- Planar graphs and matroids.Springer-Verlag KG, Sachsenplatz 4-6, 1201 Wien 344 pp. Englisch.
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Taschenbuch. Condizione: Neu. This item is printed on demand - Print on Demand Titel. Neuware -Manifolds with few preiodic homeomorphisms.- Centralizers of rootless integral matrices.- Manifolds with no periodic maps.- Injective operations of the toral groups II.- Holomorphic seifert fibering.- Holomorphically injective complex…toral actions.- Derived actions.- Group action and betti sheaf.- On infinite cyclic actions on contractible open 3-manifolds and strong irreducibility.Springer-Verlag KG, Sachsenplatz 4-6, 1201 Wien 348 pp. Englisch.
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Taschenbuch. Condizione: Neu. This item is printed on demand - Print on Demand Titel. Neuware -The main purpose of part I of these notes is to develop for a ring R a functional notion of R-completion of a space X. For R=Zp and X subject to usual finiteness condition, the R-completion coincides up to homotopy, with the p-profinit…e completion of Quillen and Sullivan; for R a subring of the rationals, the R-completion coincides up to homotopy, with the localizations of Quillen, Sullivan and others. In part II of these notes, the authors have assembled some results on towers of fibrations, cosimplicial spaces and homotopy limits which were needed in the discussions of part I, but which are of some interest in themselves.Springer-Verlag KG, Sachsenplatz 4-6, 1201 Wien 356 pp. Englisch.
Lingua: Inglese
Editore: SPRINGER NATURE Dez 1972, 1972
Serie: Reviews of Environmental Contamination and Toxicology, Libro 59 di 131. Libro 59 di 131 - Reviews of Environmental Contamination and Toxicology
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Da: BuchWeltWeit Ludwig Meier e.K., Bergisch Gladbach, GermaniaBuchWeltWeit Ludwig Meier e.K.
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Taschenbuch. Condizione: Neu. This item is printed on demand - it takes 3-4 days longer - Neuware -That residues of pesticide and other contaminants in the total environment are of concern to everyone everywhere is attested by the reception accorded previous volumes of 'Residue Reviews' and by the gratifying enthusiasm, sincerit…y, and efforts shown by all the in dividuals from whom manuscripts have been solicited. Despite much propaganda to the contrary, there can never be any serious question that pest-control chemicals and food-additive chemicals are essential to adequate food production, manufacture, marketing, and storage, yet without continuing surveillance and intelligent control some of those that persist in our foodstuffs could at times conceivably endanger the public health. Ensuring safety-in-use of these many chemicals is a dynamic challenge, for established ones are continually being dis placed by newly developed ones more acceptable to food tech nologists, pharmacologists, toxicologists, and changing pest-control requirements in progressive. food-producing economies. These matters are of genuine concern to increasing numbers of governmental agencies and legislative bodies around the world, for some of these chemicals have resulted in a few mishaps from improper use. Adequate safety-in-use evaluations of any of these chemicals per sisting into our foodstuffs are not simple matters, and they incorporate the considered judgments of many individuals highly trained in a variety of complex biological, chemical, food technological, medical, pharmacological, and toxicological disciplines. 188 pp. Englisch.
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Taschenbuch. Condizione: Neu. This item is printed on demand - it takes 3-4 days longer - Neuware 96 pp. Englisch.
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Taschenbuch. Condizione: Neu. This item is printed on demand - Print on Demand Titel. Neuware -Invariants for semi-free s1-actions.- Topological s1 and Z2k actions on spheres.- Characteristic invariants of free differentiable actions of S1 and S3 on homotopy spheres.- Differentiable pseudo-free circle actions on homotopy seven s…pheres.- Semifree circle actions with twisted fixed point sets.- Z2-torus actions on homotopy spheres.- Free and semi-free smooth actions of S1 and S3 on homotopy spheres.- Cobordism of involutions revisited.- Bemerkungen Über Äquivariante Euler-klassen.- Existence of fixed points.- Cobordism of line bundles with restricted characteristic class.- Unitary bordism of monogenic groups and isometries.- Quillen's theorem for MU.- Equivariant characteristic numbers.- Cobordism of diffeomorphisms of (k-1)-connected 2k-manifolds.- The index of manifolds with toral actions and geometric interpretations of the ( , (S1, Mn)) invariant of atiyah and singer.- Involutions on homotopy complex projective spaces and related topics.- On the homology of weighted homogeneous manifolds.- Equivariant resolution of singularities with C\* action.- Strange circle actions on products of odd dimensional spheres, and rational homotopy.- Examples of actions on manifolds almost diffeomorphic to Vn+1,2.- On unitary and sympletic knot manifolds.- A classification of 6-manifolds with free S1 actions.- SU(n) actions on manifolds with vanishing first and second integral pontrjagin classes.- On the splitting principle and the geometric weight system of topological transformation groups I.- Equivariant singular homology and cohomology for actions of compact lie groups.- Cyclic branched covers and o(n)-manifolds.- Degree of symmetry of closed manifolds.- Transfer homomorphisms of whitehead groups of some cyclic groups, II.- Surgery on four-manifolds and topologicaltransformation groups.Springer-Verlag KG, Sachsenplatz 4-6, 1201 Wien 468 pp. Englisch.
Lingua: Inglese
Editore: Springer, Springer Dez 1972, 1972
Serie: Advances in Anatomy, Embryology and Cell Biology, Libro 45 di 173. Libro 45 di 173 - Advances in Anatomy, Embryology and Cell Biology
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Taschenbuch. Condizione: Neu. This item is printed on demand - Print on Demand Titel. Neuware -Materials and Methods.- Observations.- Motoneuronal Centers and Neighbor Regions.- Sensory Relay Centers and Neighbor Regions.- Specific Precerebellar Centers.- Other Well Outlined Centers.- Diffuse Reticular and Tegmental Regions.- Mi…dline and Paramedian Nuclei of the Brain Stem.- Subependymal Regions.- Discussion.- 1. Cholinergic Transmission in the Nervous System.- 2. The Significance of a Positive AThChE Stain.- 3. The Distribution of Acetylthiocholinesterase in the Brain Stem.- Summary.- Abbreviations.- References.Springer-Verlag KG, Sachsenplatz 4-6, 1201 Wien 56 pp. Englisch.
Lingua: Inglese
Editore: Springer, Springer Dez 1972, 1972
Serie: CISM International Centre for Mechanical Sciences, Libro 3 di 433. Libro 3 di 433 - CISM International Centre for Mechanical Sciences
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Taschenbuch. Condizione: Neu. This item is printed on demand - Print on Demand Titel. Neuware Springer-Verlag KG, Sachsenplatz 4-6, 1201 Wien 232 pp. Englisch.
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Taschenbuch. Condizione: Neu. This item is printed on demand - Print on Demand Titel. Neuware -This volume is intended to provide a comprehensive treatment of recent developments in methods of perturbation for nonlinear systems of ordinary differ ential equations. In this respect, it appears to be a unique work. The main goal is… to describe perturbation techniques, discuss their ad vantages and limitations and give some examples. The approach is founded on analytical and numerical methods of nonlinear mechanics. Attention has been given to the extension of methods to high orders of approximation, required now by the increased accuracy of measurements in all fields of science and technology. The main theorems relevant to each perturbation technique are outlined, but they only provide a foundation and are not the objective of these notes. Each chapter concludes with a detailed survey of the pertinent literature, supplemental information and more examples to complement the text, when necessary, for better comprehension. The references are intended to provide a guide for background information and for the reader who wishes to analyze any particular point in more detail. The main sources referenced are in the fields of differential equations, nonlinear oscillations and celestial mechanics. Thanks are due to Katherine MacDougall and Sandra Spinacci for their patience and competence in typing these notes. Partial support from the Mathematics Program of the Office of Naval Research is gratefully acknowledged.Springer-Verlag KG, Sachsenplatz 4-6, 1201 Wien 384 pp. Englisch.
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Taschenbuch. Condizione: Neu. This item is printed on demand - Print on Demand Titel. Neuware -These are the revised notes of a course for graduate students and some seminar talks which I gave at the University of Rochester during Fall Term 1969/70. They would not have been written without the encouragement and the aid which I r…eceived, during all stages of the work, by friends from Rochester, Rio de Janeiro, and Bonn. I wish to thank all of them: Barbara Grabkowicz encouraged me to write these notes in English and read carefully parts of a preliminary manuscript, as did Gervasio G. Bastos, Yves A. E. Lequain, Walter Strubel, and Antonio J. Engler. Many valuable suggestions were given me by Yves A. E. Lequain, and several improvements of theorems and proofs are due to him. I am particularly grateful to Linda C. Hill for her criticism in reading the last version and for improving and smoothing many of my formulations. Last but not least I thank Wilson Goes for the excellent typing. Most of this book was elaborated when I stayed in Rio de Janeiro as a Visiting Professor at IMPA (Institute for Pure and Applied Mathematics) and as a Pesquisador-Conferencista of CNPq (National Research Council). Thanks are also due to these institu tions.Springer-Verlag KG, Sachsenplatz 4-6, 1201 Wien 256 pp. Englisch.
Lingua: Inglese
Editore: Springer Berlin Heidelberg, Springer Dez 1972, 1972
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Taschenbuch. Condizione: Neu. This item is printed on demand - Print on Demand Titel. Neuware -Quantum chemistry of nonbenzenoid cyclic conjugated hydrocarbons.- Some formal properties of the kinetics of pentacoordinate stereoisomerizations.- Radiochemical transformations and rearrangements in organometallic compounds.Springer-V…erlag GmbH, Tiergartenstr. 17, 69121 Heidelberg 120 pp. Englisch.
Lingua: Inglese
Editore: Springer, Springer Berlin Heidelberg Dez 1972, 1972
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Da: BuchWeltWeit Ludwig Meier e.K., Bergisch Gladbach, GermaniaBuchWeltWeit Ludwig Meier e.K.
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Taschenbuch. Condizione: Neu. This item is printed on demand - it takes 3-4 days longer - Neuware -In biological literature, several definitions of quantitative autoradio graphy are given. The term is defined as either the determination and com parison of the density of silver grains above various structures or under varying con…ditions, or the determination of absolute quantities of radio activity. In both these cases, photometric measurement serves for more rapid and more exact evaluation of grain densities than would be possible by visual counting of the grains. The equipment generally used for the photometric measurement of silver grains consists of a microscope, a photocell, an electronic amplifier system and a display unit. Grains can be made accessible to photometric evaluation by various kinds of microscopic illumination: 1. Substage bright-field illumination. 2. Substage dark-field illumination. 3. Incident dark-field illumination. 4. Vertical bright-field illumination. With all these types of illumination, the relationship between the luminous flux I absorbed by the film, scattered into the objective and reflected or diffracted, and the flux 10 which is not affected by the film is used as a measure of grain density. Since these are differential measurements, the light beam I transmitted by the film is in itself a measure of grain density if the luminous flux 10 incident on the grains is kept constant. This approach has been used in a large number of measuring setups. 252 pp. Englisch.
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Da: BuchWeltWeit Ludwig Meier e.K., Bergisch Gladbach, GermaniaBuchWeltWeit Ludwig Meier e.K.
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Taschenbuch. Condizione: Neu. This item is printed on demand - it takes 3-4 days longer - Neuware -It is now generally accepted for a variety of reasons - morphological as well as physiologica- that the visual systems of arthropods provide a suitable model for the study of information proces sing in neuronal networks. Unlike the… neurophysiology of the visual pathway in the frog and the cat which is more than adequately documented, recent work on the compound eye and optical ganglia of spiders, crustaceans, and insects has scarcely been summarized. In order to fill this void so that others, especially vertebrate neurophysiologists may become familiar with the advan tages of these systems, our group at Zurich University organized here in March 1972, a European meeting to discuss the anatomical. ! neurophysiological and behavioral knowledge on the compound eye and the visual. pathway of arthropods. Systems analysis was regarded as the main theme of the conference, but systems analysis of a network of neurons cannot be done as a mere 'black-box' maneuver. The conference therefore tried to reconcile neurophysiology and behavioral analysis in order to make predictions about a necessary and sufficient neural structure. The 'wiring dia grams' of such a structure might then be confirmed histologically. Hence the aim of the conferen ce was not to deal only with the structure and function of the compound eye - i. e. 352 pp. Englisch.
