Tham khảo sách 'the materials information company.publication information and alloy phase diagrams volume 3', kỹ thuật - công nghệ, cơ khí - chế tạo máy phục vụ nhu cầu học tập, nghiên cứu và làm việc hiệu quả
Diffusion is the transport of matter from one point to another by thermal
motion of atoms or molecules. It is relatively fast in gases, slow in liquids, and
very slow in solids. Diffusion plays a key rˆole in many processes as diverse as
intermixing of gases and liquids, permeation of atoms or molecules through
membranes, evaporation of liquids, drying of timber, doping silicon wafers to
make semiconductor devices, and transport of thermal neutrons in nuclear
The “origin of this species” lies in the pages of the journal Biometrika and precedes
the birth of either of the authors. There, in his remarkable landmark 1951 paper “Random
dispersal in theoretical populations,” J.G. Skellam made a number of observations that have
profoundly affected the study of spatial ecology.
This textbook has evolved from part of the first-year graduate curriculum in the
Department of Materials Science and Engineering at the Massachusetts Institute of
Technology (MIT) . This curriculum includes four required semester-long subjects-
“Materials at Equilibrium,” “Mechanical Properties of Materials,” “Electrical, Optical,
and Magnetic Properties of Materials,” and “Kinetic Processes in Materials.
In 1896, Karl Benz was granted a patent for his design of the first engine with horizontally opposed pistons. His design created an engine in which the corresponding pistons move in horizontal cylinders and reach top dead center simultaneously, thus automatically balancing each other with respect to their individual momentum. Engines of this design are often referred to as flat engines because of their shape and lower profile.
The increasing demand on ultra miniturized electronic devices for ever improving
performances has led to the necessity of a deep and detailed understanding
of the mathematical theory of charge transport in semiconductors.
The Watt steam engine was the first type of steam engine to make use of steam at a pressure just above atmospheric to drive the piston helped by a partial vacuum. Improving on the design of the 1712 Newcomen steam engine, the Watt steam engine, developed sporadically from 1763 to 1775, was a great step in the development of the steam engine. Offering a dramatic increase in fuel efficiency, James Watt's design became synonymous with steam engines, due in no small part to his business partner, Matthew Boulton.
Newnes An imprint of Elsevier Science Linacre House, Jordan Hill, Oxford OX2 8DP 200 Wheeler Road, Burlington MA 01803 First published 1989 Second edition 1996 Reprinted 1998 (twice), 1999 Third edition 2001 Fourth edition 2003 Copyright 2001, 2003, John Bird.
Library of Congress Control Number: 2007943075 ISSN 0947-6075 ISBN 978-3-540-73494-9 Springer Berlin Heidelberg New York This work is subject to copyright. All rights are reserved, whether the whole or part of the material is concerned, speciﬁcally the rights of translation, reprinting, reuse of illustrations, recitation, broadcasting, reproduction on microﬁlms or in any other way, and storage in data banks.
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Abstract Neural architectures have been proposed to navigate mobile robots within several environment definitions. In this paper a new neural modular constructive approach to navigate mobile robots in unknown environments is presented. The problem, in its basic form, consists of deﬁning and executing a trajectory to a predeﬁned goal while avoiding all obstacles, in an unknown environment. Some crucial issues arise when trying to solve this problem, such as an overﬂow of sensorial information and conﬂicting objectives.
The Mobile Detection Assessment and Response System, Exterior (MDARS-E) provides an automated robotic security capability for storage yards, petroleum tank farms, rail yards, and arsenals. The system includes multiple supervised-autonomous platforms equipped with intrusion detection, barrier assessment, and inventory assessment subsystems commanded from an integrated control station. The MDARS-E Intrusion Detection System consists of a motion sensor suite which is selectively enabled while the vehicle is momentarily halted in execution of pre-defined but randomly executed patrols.