Libros de ciencias, página 56 de 2699

Topological solitons occur in many nonlinear classical field theories. They are stable, particle-like objects, with finite mass and a smooth structure. Examples are monopoles and Skyrmions, Ginzburg-Landau vortices and sigma-model lumps, and Yang-Mills instantons. This book is a comprehensive survey of static topological solitons and their dynamical interactions. Particular emphasis is placed on the solitons which satisfy first-order Bogomolny equations. For these, the soliton dynamics can be investigated by finding the geodesics on the moduli space of static multi-soliton solutions. Remarkable scattering processes can be understood this way. The book starts with an introduction to classical field theory, and a survey of several mathematical techniques useful for understanding many types of topological soliton. Subsequent chapters explore key examples of solitons in one, two, three and four dimensions. The final chapter discusses the unstable sphaleron solutions which exist in several field theories.

This edited volume is a collection of population and metapopulation models for a wide variety of species, including plants, invertebrates, fishes, amphibians, reptiles, birds, and mammals. Each chapter of the book describes the application of RAMAS GIS 4.0 to one species, with the aim of demonstrating how various life history characteristics of the species are incorporated into the model, and how the results of the model has been or can be used in conservation and management of the species. The book comes with a CD that includes a demo version of the program, and the data files for each species.

El Diccionario de Agricultura en su 6ª edición es, en forma acreditada, también sistemático, es decir ordenado según aspectos lingüísticos. La obra puede ser utilizada no solamente como terminología

Leonhart Fuchs (1501-1566), el padre de la botánica moderna, da nombre a una llamativa flor y a su color correspondiente, el fucsia. En 1543 combinó sus excepcionales conocimientos de botánica con revolucionarias investigaciones medicas en el The New Herbal, un catalogo de medio millar de plantas y sus propiedades curativas. Aunque se trataba de una obra de confianza y referencia cientifica, The New Herbal gano en popularidad, sobre todo, por los detalles y la calidad de sus ilustraciones. Las descripciones de las caracteristicas, el origen y las propiedades medicinales de las plantas se acompañaban de minuciosas ilustraciones grabadas en madera, lo que permitia identificar las especies y establecio nuevos estandares de precision y calidad en el universo de las publicaciones de botanica. En la epoca de las grandes expediciones, The New Herbal tambien documento especies del Nuevo Mundo recien descubiertas por los europeos e incluyo el primer registro visual de las plantas del tabaco, el maiz, la judia roja y el cactus. Esta reimpresion de TASCHEN se ha realizado a partir de la copia personal coloreada por el propio Fuchs, que ha sobrevivido milagrosamente a lo largo de cuatro siglos y medio en un estado impoluto. Esta obra, que fascinara a historiadores de la medicina y el arte, jardineros y aficionados a las plantas curativas, incluye mas de 500 ilustraciones excepcionales, y un articulo que narra la historia de dichas plantas.

La novena edición de Biología Celular y Molecular incluye capítulos nuevos y mejorados: “Mecanismos genéticos moleculares fundamentales” ha sido reorganizado para comenzar con la estructura y la

This book provides a completely revised and expanded version of the previous classic edition General Relativity and Relativistic Astrophysics.In Part I the foundations of general relativity are thoroughly developed, while Part II is devoted to tests of general relativity and many of its applications. Binary pulsars our best laboratories for general relativity are studied in considerable detail. An introduction to gravitational lensing theory is included as well, so as to make the current literature on the subject accessible to readers.Considerable attention is devoted to the study of compact objects, especially to black holes. This includes a detailed derivation of the Kerr solution, Israels proof of his uniqueness theorem, and a derivation of the basic laws of black hole physics. Part II ends with Wittens proof of the positive energy theorem, which is presented in detail, together with the required tools on spin structures and spinor analysis. In Part III, all of the differential geometric tools required are developed in detail. A great deal of effort went into refining and improving the text for the new edition. New material has been added, including a chapter on cosmology.The book addresses undergraduate and graduate students in physics, astrophysics and mathematics. It utilizes a very well structured approach, which should help it continue to be a standard work for a modern treatment of gravitational physics. The clear presentation of differential geometry also makes it useful for work on string theory and other fields of physics, classical as well as quantum.