Chain Mobility And Progress In Medicine Pharmaceutical And Polymer Science And Technology

Chain Mobility and Progress in Medicine, Pharmaceuticals, and Polymer Science and Technology covers the core fundamentals and applications of chain movement, chain mobility, segmental mobility, segmental dynamics, and chain orientation in polymer science, medicine, pharmaceuticals, and other disciplines. The book starts by defining principal terms, then looks at the work of Pierre-Gilles de Gennes and his 1991 Nobel Prize in Physics for his work on polymer-chain motion. From there the book discusses the different mechanisms of chain motion of macromolecular substances, the conditions under which chains move, and the effects of these movements on properties of materials, such as chain alignment, chain orientation, creation of free volume, dimensional stability, and more. The final chapters provide insight on analytical methods of chain movement, chain movement phenomena in different polymers, and various fields of application. All concepts, findings, and applications are discussed in easy-to-understand language stripped of disciplinary slang, making the book accessible to researchers and practitioners across a variety of scientific fields. Discusses various chain motion mechanisms such as bond fluctuation, Brill transition, chain diffusion, and more and how these can be applied in the development of cutting-edge products Looks at conditions under which chains move and the effects these movements have on the properties of materials Provides examples of research and technological aspects of chain movements as they relate to analytical methods used for studies, different polymers, and various fields of application

Covers available fillers and their properties, their effect on filled materials such as mechanical properties, rheology, morphology, flammability, and recycling, and their use in practical applications

A comprehensive update on the fundamentals and recent advancements of electrical properties of polymers.

An in-depth analysis of thermoelectric theory, an overview of present day thermoelectric materials and devices, and updated information on the most studied thermoelectric materials development. The main emphasis is on a basic understanding of the concepts as well as experimental techniques needed to propel researchers towards new and novel classes of thermoelectric materials with enhanced properties.

Polymers play a vital role in manufacturing processes of many kinds, and the development of new polymeric materials is of increasing importance in the field of materials science. Because of this, there is a need to understand why the properties of polymers change, what can be done to avoid degradation and failure, and how performance can be maintained over a much longer lifespan. The authors deal firstly with the process of degradation through oxidation, and then explain how the addition of various antioxidants can inhibit or retard this process. They present a unique discussion of the physico-chemical aspects, particularly the chemical kinetics of antioxidant action and of branched chain reaction kinetics, and the theory of critical phenomena inhibited oxidation. The last part of the book offers practical advice on methods of oxidation investigation, on selection of appropriate antixodants, and on the basic principles of performance prognosis. The book also includes a unique coverage of the regularities of additive solubility.

Providing new insights into the relationship between transport and the environment, and the meaning of the concept of sustainable development for the transport sector, special attention is paid to the relationship between technological progress and policy. The different theoretical approaches are combined to create a strategy for R&D and the implementation of mega-technological innovations. The author deals with two specific cases: Maglev technology and fuel-cell technology for transport purposes. Taking into account the new theoretical insights and the empirical findings, the resulting synthesis and conclusions are important for researchers and professionals in transportation, environmental sciences and related fields.

Optoelectronic devices are currently being developed at an extraordinary rate. Organic light-emitting diodes, photovoltaic devices and electro-optical modulators are pivotal to the future of displays, photosensors and solar cells, and communication technologies. This book details the theories underlying the mechanisms involved in the relevant organic materials and covers, at a basic level, how the organic components are made. The first part of the book introduces the fundamental theories used to describe ordered solids and goes onto detail on concepts applicable to localised energy levels. Then the methods used to determine energy levels particular to perfectly ordered molecular and macromolecular systems are discussed along with a detailed consideration of the effects of quasi-particles. The function of excitons and their transfer between two molecules is studied and, in addition, the problems associated with interfaces and charge injection into resistive media are presented. More technological aspects are covered in the second part, which details the actual methods used to fabricate devices based on organic materials, such as dry etching. The principal characterisation techniques are also highlighted. Specific attention is paid to visual displays using organic light-emitting diodes; the conversion of photons into electrical energy (the photovoltaic effect); and for communications and information technologies, the electro-optical modulation of signals.

The book is intended to describe the basic and newly developed elements of the physics of solids and materials science on mechanical properties of metals with as much continuity as is possible. Particular emphasis has been placed in atomistic and fractal approaches and continuum theory of dislocations is also introduced. Since the book is meant for the two main topics of progress in recent years, some interesting and important topics which have not been discussed or introduced are given in detail.For a long time, pair potentials were used very expensively in simulation studies. They can reproduce usefully total energies for many systems. But when one turns to elastic properties, fracture of surfaces, and the vacancy formation energy, deficiencies and limitations begin to emerge. These limitations of the simple pair potential approximation have been addressed by the development of empirical many-body potentials which is the major theme of our book.Over a decade or more, diverse scientists have recognized that many of the structures common in their experiments have a special kind of geometrical complexity. The key to this progress is the recognition that many random structures obey a symmetry that objects look the same on many different scales of observation. The concept of fractals was introduced by Mandelbrot and applied to fractures by himself and collaborators. Their work pointed to a correlation between toughness and the fractal dimension. Our interest is the fractal aspects of fractured surfaces. We will discuss more in our book.The strain field of a dislocation has a long range part and this part can be discussed rigorously from elasticity theory. Recent progress in elastic strain fields and dislocation mobility were made by Indenbom and Lothe. The elementary essentials will be introduced in our book.

This timely monograph addresses an important class of semiconductors and devices that constitute the underlying technology for blue lasers. It succinctly treats structural, electrical and optical properties of nitrides and the substrates on which they are deposited, band structures of nitrides, optical processes, deposition and fabrication technologies, light-emitting diodes, and lasers. It also includes many tables and figures detailing the properties and performance of nitride semiconductors and devices.

This book identifies the most important "rules" governing transport, partitioning, retention and transformation of leaked motor fuels in the underground environment. It examines micro-scale fate and transport processes as a means toward promoting a better understanding of larger scale movement of contaminants. Environmental scientists, engineers, consultants, and managers will find Mobility and Degradation of Organic Contaminants in Subsurface Environments to be a useful technical handbook. Less experienced users will appreciate its in-depth explanations of the fate and transport processes vital to effective remedial response. More experienced users will use the book as a source of information, data and equations to support quantitative assessments of pollutant fate and transport.

'Brain Drain' -- intellectual emigration -- exodus of the society which to a considerable extent define its cultural, scientific, technological and socio-economic progress and its contribution to the global civilisation takes a growing international scale.

In recent years, the development of powerful epitaxial growth techniques such as molecular beam epitaxy (MBE), ultra-high vacuum chemical vapour deposition (UHVCVD) and other low temperature epitaxy techniques have given rise to a new area of research of bandgap engineering in silicon based materials. This development has paved the way for heterojunction bipolar and field effect transistors, as well as for novel quantum devices. This title provides a comprehensive introduction to silicon heterostructures, including growth and characterization of materials and descriptions of new heterostructure devices, making it a useful reference for postgraduate students, researchers and scientists.