Libros de Estudios y ensayos, página 5 de 139

This volume is intended to serve as a general text in solid state physics for undergraduates in physics, applied physics, engineering, and other related scientific disciplines. I also hope that it will serve as a useful reference too for the many workers engaged in one type of solid state research activity or another, who may be without formal training in the subject.

Se recogen los trabajos presentados en esta cita, realizados por primerísimas autoridades mundiales en diferentes campos de la Física y donde se muestra parte de la actividad científica de nuestro pais, desde los aspectos mas fundamentales de la cosmologia y la fisica fundamental a la nanotecnologia, optica, informacion cuantica, plasmas o aplicaciones medicas, entre otros.

Aborda el estudio de las materias primas y procesos necesarios para la producción de papel. El libro está dirigido al químico coloidal y al físico, cuyo interés supera los aspectos superficiales de la industria del papel. La tematica va desde la evolucion historica de la celulosa hasta la obtencion de reactivos quimicos para el blanqueo.

Practical, clearly organized, up-to-date and user-friendly, Kevin Skahill''s VHDL for Programmable Logic gives you the tools you need to learn how to program in VHDL and how to use VHDL to synthesize circuits -- including a complete professional VHDL software tool, Warp2 from Cypress Semiconductor. System Requirements for Warp2 Cypress Semiconductor home page Cypress Technical Support Whether you are a student looking for a dynamic, real-world introduction to an industry-standard HDL, or a professional engineer in need of a fast, effective approach to VHDL, VHDL for Programmable Logic will get you up to speed. This hands-on tutorial explains the architecture, features, and technologies of programmable logic and teaches how to write VHDL code for synthesis. Many practical design examples focus on state machine design, counters, shifters, arithmetic circuits, control logic, FIFOs, and other "glue logic" that designers typically implement in programmable logic. Included with the book is a CD-ROM containing Cypress Semiconductor''s Warp2 , a fully functional professional VHDL synthesis tool for Windows PCs and Sun workstations. Warp2 is a CPLD and FPGA synthesis, fitting, placement and routing software tool, which includes an interactive waveform simulator that performs functional simulation of CPLDs. Warp2 will allow the student or professional to use VHDL to design, simulate, and implement digital systems in programmable logic. Features and Benefits (...)

The search for a quantum theory of the gravitational field is one of the great open problems in theoretical physics. This book presents a self-contained discussion of the concepts, methods and applications that can be expected in such a theory. The two main approaches to its construction - the direct quantization of Einstein''s general theory of relativity and string theory - are covered. Whereas the first attempts to construct a viable theory for the gravitational field alone, string theory assumes that a quantum theory of gravity will be achieved only through a unification of all the interactions. However, both employ the general method of quantization of constrained systems, which is described together with illustrative examples relevant for quantum gravity. There is a detailed presentation of the main approaches employed in quantum general relativity: path integral quantization, the background-field method and canonical quantum gravity in the metric, connection and loop formulations. The discussion of string theory centers around its quantum-gravitational aspects and the comparison with quantum general relativity. Physical applications discussed at length include the quantization of black holes, quantum cosmology, the indications of a discrete structure of spacetime, and the origin of irreversibility. This book will be of interest to researchers and students working in relativity and gravitation, cosmology, quantum field theory and related topics. It will also be of interest to mathematicians and philosophers of science. This book maintains a high level of clarity throughout, and is written with admirable patience. It will be found very useful by a begining researcher in quantum gravity who wants to have a comprehensive overview of the subject. Equally well, senior researchers in the field will find it a handy reference for standard analyses of various aspects of the subject. Gen.Realtiv.Gravi. (2006) 38(1): 183-185 `Review from previous edition This book maintains a high level of clarity throughout, and is written with admirable patience. It will be found very useful by a beginning researcher in quantum gravity who wants to have a comprehensive overview of the subject. Equally well, senior researchers in the field will find it a handy reference for standard analyses of various aspects of the subject.'' General Relativity and Gravitation `... a

This work is centred around the role of non-Hermitian Hamiltonians in Physics both at the quantum and classical levels. In our investigations of two-level quantum models we demonstrate the phenomenon of fast transitions developed in the PT-symmetric quantum brachistochrone problem may in fact be attributed to the non- Hermiticity of evolution operator used, rather than to its invariance under PT operation. When it comes to Hilbert spaces of infinite dimension, we show how Lie algebras and Groenewold?Moyal can be explored to construct isospectral Hermitian partners. Alongside, metrics with respect to which the original Hamiltonians are Hermitian are also constructed, allowing to assign meaning to a large class of non-Hermitian Hamiltonians possessing real spectra. Classically, our efforts were concentrated on integrable models presenting PT-symmetry. We use the Painleve test to check whether deformations of integrable systems preserve integrability and we study the pole structure of certain real valued nonlinear integrable systems and establish that they behave as interacting particles whose motion can be extended to the complex plane in a PT-symmetric way.