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1000 tulosta hakusanalla J.R.R. Tolkien

Microstrip Antenna Theory and Design

Microstrip Antenna Theory and Design

J.R. James; P.S. Hall; C. Wood

Institution of Engineering and Technology
1981
nidottu
In the past few years, the concept of creating microwave antennas using microstrip has attracted increasing attention and viable practical designs are now emerging. The purpose of this monograph is to present the reader with an appreciation of the underlying physical action, up-to-date theoretical treatments, useful antenna design approaches and the overall state-of-the-art situation. The emphasis is on antenna engineering design, but to achieve this goal it has been necessary to delve into the behaviour of microstrip in a much wider sense and also include aspects of electromagnetic analysis. As a consequence, the monograph will also be of interest to microstrip circuit designers and to some extent those seeking electromagnetic problems of a challenging nature. The astronomical progress in miniaturising and integrating electronic circuits in the past decade has recently crerated a positive demand for a new generation of antenna systems. In principle, microstrip antennas are thin planar configurations that are leightweight, low cost, easy to manufacture and can be made conformal with the surfaces of vehicles, missiles etc. The compatibility of microstrip antennas with integrated electronics is another great advantage. However, the microstrip wavetrapping effects inhibit the radiation mechanism and must be taken into account in antenna design. Wave-trapping effects in substrates involve the study of surface waves and discontinuities in open waveguide structures. The microstrip antenna designer must therefore encompass many more effects than previously considered by microstrip circuit designers. It is for these reasons that the scope of this monograph is necessarily somewhat wider than the title may suggest. The ten chapters are a blend of introductory, practical and theoretical treatments and likely future developments are also highlighted. A good selection of past and current references are given and each chapter concludes with a helpful summary comment.
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Temperature Measurement and Control

Temperature Measurement and Control

J.R. Leigh

Institution of Engineering and Technology
1988
sidottu
The temperature on earth varies over a wide range whereas man can only work comfortably in a quite narrow temperature range that has to be artificially maintained. In addition, many industries have extensive requirements for temperature control. Thus control engineers are called upon very frequently to design temperature control loops. A general knowledge of control engineering is of course useful in designing temperature control loops.However, temperature control has some special features: (i) asymmetries caused by the usually differing mechanisms of heating and cooling(ii) complex nonlinear heat-transfer effects(iii) highly application-dependent measurement problems. The intention of this book is to treat the theory and practice of temperature measurement and control, and important related topics such as energy management and air pollution, at a level suitable for engineering and science undergraduate and postgraduate students, and in a manner designed to make the book valuable to practising engineers. There are no specific prerequisites for the book although a knowledge of elementary control theory could be useful. The philosophy of the book is a compromise between fundamentals and practical guidelines. It is the author's firm belief that it is highly desirable to obtain a good insight into theoretical fundamentals (deeper than can be justified on grounds of immediate utility) before embarking on practical applications. The aim has been to produce a practically oriented text within a firm theoretical outline. The first half of the book is an application oriented survey of temperature measurement techniques and devices. The second half is concerned mainly with temperature control in both simple and complex situations. There are chapters on heat sources, commercially available controllers, temperature control in buildings and energy conservation. The book ends with an appendix that rapidly surveys the underpinning thermodynamic theory.
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Modelling and Parameter Estimation of Dynamic Systems

Modelling and Parameter Estimation of Dynamic Systems

J.R. Raol; G. Girija; J. Singh

Institution of Engineering and Technology
2004
sidottu
Parameter estimation is the process of using observations from a system to develop mathematical models that adequately represent the system dynamics. The assumed model consists of a finite set of parameters, the values of which are calculated using estimation techniques. Most of the techniques that exist are based on least-square minimisation of error between the model response and actual system response. However, with the proliferation of highspeed digital computers, elegant and innovative techniques like filter error method, genetic algorithms and artificial neural networks are finding more and more use in parameter estimation problems. Modelling and Parameter Estimation of Dynamic Systems presents a detailed examination of many estimation techniques and modelling problems.
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Corrosion of Aluminium and Aluminium Alloys

Corrosion of Aluminium and Aluminium Alloys

J.R. Davis

ASM International
1999
sidottu
This volume presents comprehensive coverage of the corrosion behavior of aluminum and aluminum alloys, with emphasis on practical information about how to select and process these materials in order to prevent corrosion attack. Described are the characteristics of these materials and the influences of composition, mechanical working, heat treatment, joining methods, microstructure, and environmental variables on their corrosion.
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Surface Engineering for Corrosion and Wear Resistance

Surface Engineering for Corrosion and Wear Resistance

J.R. Davis

ASM International
2001
nidottu
Engineers are faced with a bewildering array of choices when selecting a surface treatment for a specific corrosion or wear application. This book provides practical information to help them select the best possible treatment. An entire chapter is devoted to process comparisons, and dozens of useful tables and figures compare surface treatment thickness and hardness ranges; abrasion and corrosion resistance; processing time, temperature, and pressure; costs; distortion tendencies; and other critical process factors and coating characteristics. The chapter 'Practical Guidelines for Surface Engineering' describes hands-on approaches for matching surface treatments with design and performance requirements. The book includes the content from an Institute of Materials design guide publication, combined with information from several ASM Handbook volumes and other ASM and industry sources. All the material has been carefully organized, edited, and rewritten as needed to provide a comprehensive, up-to-date, and user-friendly guide to the subject.Contents: Introduction; Principles of Corrosion; Principles of Friction and Wear; Surface Engineering to Change the Surface Metallurgy; Surface Engineering to Change the Surface Chemistry; Surface Engineering to Add a Layer or Coating; Process Comparisons; Practical Design Guidelines for Surface Engineering; Glossary; Index.
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ASM Specialty Handbook

ASM Specialty Handbook

J.R. Davis

ASM International
2001
sidottu
This book is a comprehensive guide to the selection and applications of copper and copper alloys, which constitute one of the largest and most diverse families of engineering materials. The handbook includes all of the essential information contained in the 20-volume ASM Handbook series, as well as important reference information and data from a wide variety of ASM publications and industry sources. In addition to extensive property data for wrought, cast, and powder-metallurgy products, this book provides practical information on the casting, forming, joining, machining, and finishing of copper alloys. The principles of physical metallurgy, including the relationships among heat treatment, structure, and properties, are also examined. Specifications for copper and its alloys are cross referenced in useful tabular form. Recent alloy developments - such as low-lead free-machining alloys, high-strength alloys with resistance to corrosion in hot 'sour' environments, and thermally stable, high-conductivity electronic packaging materials-are also reviewed. Contents: Metallurgy, alloys, and applications Fabrication and finishing Metallurgy, microstructures, and phase diagrams: Metallography and microstructures of copper alloys and beryllium-copper alloys Solidification structures Phase diagrams. Engineering properties and service characteristics Appendices.
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Surface Hardening of Steels

Surface Hardening of Steels

J.R. Davis

ASM International
2002
sidottu
Surface Hardening of Steels: Understanding the Basics is a practical selection guide to help engineers and technicians choose the most efficient surface hardening techniques that offer consistent and repeatable results. Emphasis is placed on characteristics such as processing temperature, case/coating thickness, bond strength, and hardness level obtained. The advantages and limitations of the various thermochemical, thermal, and coating/surface modification technologies are compared. Economic concerns and health and safety considerations are also addressed. Recent developments in the understanding of the relationships between microstructure and fatigue and wear performance are reviewed, as are more recently introduced surface hardening processes such as vacuum-related technologies, laser processing, CVD/PVD, and ion implantation. Methods for evaluating hardness patterns and depths of hardness for quality control and failure analysis are described. The book also reviews methods for measuring and controlling case depth, residual stresses, and distortion. Metallurgical comparisons are made between those processes that offer rapid heating and rapid cooling (self quenching) characteristics for example, induction hardening and conventional furnace hardening. While all of the surface engineering methods discussed enhance wear resistance, some such as electroless nickel plating, carbide salt-bath deposition, and chrome platingualso offer resistance to corrosion and oxidation. Wear and corrosion data are provided to demonstrate the benefits of each process. Contents: Process Selection Guide Gas Carburizing Vacuum and Plasma Carburizing Pack and Liquid Carburizing Carbonitriding Nitriding Nitrocarburizing Boriding (Boronizing) Thermal Diffusion (TD) Process Surface Hardening by Applied Energy Surface Hardening by Coating or Surface Modification Appendices: The Iron-Carbon Phase Diagram, Hardness Conversion Tables, Austenitizing Temperatures for Steels Index.
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Tensile Testing

Tensile Testing

J.R. Davis

ASM International
2004
nidottu
A complete guide to the uniaxial tensile test, the cornerstone test for determining the mechanical properties of materials:Learn ways to predict material behavior through tensile testing.Learn how to test metals, alloys, composites, ceramics, and plastics to determine strength, ductility and elastic/plastic deformation.A must for laboratory managers, technicians, materials and design engineers, and students involved with uniaxial tensile testing.Tensile Testing, Second Edition begins with an introduction and overview of the test, with clear explanations of how materials properties are determined from test results. Subsequent sections illustrate how knowledge gained through tensile tests, such as tension properties to predict the behavior (including strength, ductility, elastic or plastic deformation, tensile and yield strengths) have resulted in improvements in materals applications.The Second Edition is completely revised and updated. It includes expanded coverage throughout the volume on a variety of topics, including equipment, testing for design, and testing at extreme temperatures and high strain rates.
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Crude Oil Waxes, Emulsions, and Asphaltenes

Crude Oil Waxes, Emulsions, and Asphaltenes

J.R. Becker

PennWell Books
1997
nidottu
Becker explains the physical chemical problems associated with waxes and emulsions and the new technologies for treatment of these problems. Contents: Petroleum companies and emulsions Forces involved in macroscopic physical behavior of emulsions Oil and water emulsion breakers Petroleum companies and waxes Chemical surfaces Wax crystal order and temperature Wax: physical properties and quantum effects Ashaltenes and crude oil Ashaltenes: bulk behavior and testing methods Physical properties of treating chemicals Appendices.
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Corrosion and Scale Handbook

Corrosion and Scale Handbook

J.R. Becker

PennWell Books
1999
nidottu
Corrosion and scale in crude oil systems are two of the most costly problems facing oil companies, which go to great expense to effectively control the problems. Corrodible surfaces are found throughout production, transport, and refining equipment. Therefore, the protection of this equipment is critical to the profitability and successful operation of these companies. While scale control ranks lower in importance, its presence is also costly in terms of equipment damage. This book provides understanding of these processes, their impact on petroleum companies, and potential solutions and inhibitors. Contents: Petroleum-related corrosion and scale Petroleum-related fluids and scale Petroleum fluids and corrosion Petroleum industry Mild steel Petroleum fluid scale growth & inhibitation Solid-solid surfaces Electrochemical effects on scale Special case of hydrogen Corrosion and scale forms Electrochemical behavior of petroleum fluids Corrosion inhibitation Phase behavior of corrosion chemicals and scale chemicals Petroleum fluids corrosion and scale testing Synthetic routes to some scale and corrosion chemicals Corrosion and scale inhibitiors and native petroleum surfactants Epilogue.
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Multivariate Analysis in the Human Services

Multivariate Analysis in the Human Services

J.R. Schuerman

Kluwer Academic Publishers
1983
sidottu
Research and evaluation in the human services usually involves a relatively large number of variables. We are interested in phenomena that have many aspects and many causes. The techniques needed to deal with many variables go beyond those of introductory statistics. Elementary procedures in statistics are limited in usefulness to situations in which we have two or three variables. When we have more than that, application of elementary techniques will often yield mis­ leading results. Why are elementary techniques inadequate when applied to many variables? Why, for example, should we not simply interpret a series of correlations of independent and dependent variables? The answer lies in the fact that these correlations are not independent pieces of information. The correlations of vari­ ables x and z with yare affected by the association of x with z. Hence, talk about the "effect" of x on y will be somewhat ambiguous, since we will be in­ cluding in that effect some of the effects of z. We would like to be able to sort out these effects. This is the problem of "estimation," that is, estimating the relationships or effects between variables, taking into account their relationships with other variables.
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Centralization and Power in Social Service Delivery Systems

Centralization and Power in Social Service Delivery Systems

J.R. Hollingsworth; R. Hanneman

Kluwer Academic Publishers
1983
sidottu
In the United States and other western nations, debates rage over whether welfare, medical care, educational programs, and many other aspects of public policy should be the responsibility of central govern­ ment, local government, or the private sector. In most nations, the issues of regional autonomy and decentralization are constantly in the news, with intensity varying from mild debate to open warfare. Less visibly, battles are continuously fought in the political arena over what groups should have the right to make decisions concerning the allocation of soci­ ety's resources. In response to these concerns, social scientists have focused consider­ able attention on the causes and consequences of centralization and de­ centralization in political, economic, and social organizations. Their analyses of centralization have been varied, ranging from systems that are quite small (e. g. , the family, the firm, and the community) to those sys­ tems that are very large (e . g. , the welfare state). While centralization is a concept of major concern in most of the social science disciplines, each discipline has tended to focus on centralization with a different set of interests. Economists have been very much concerned with the causes and the consequences of the concentration of economic resources. Polit­ ical scientists have long sought to understand the origins and conse­ quences of dictatorship and democracy. Sociologists have focused on inequalities in the distribution of power.
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My Father And Myself

My Father And Myself

J.R. Ackerley

NYRB Classics
1999
nidottu
When his father died, J. R. Ackerley was shocked to discover that he had led a secret life. And after Ackerley himself died, he left a surprise of his own--this coolly considered, unsparingly honest account of his quest to find out the whole truth about the man who had always eluded him in life. But Ackerley's pursuit of his father is also an exploration of the self, making My Father and Myself a pioneering record, at once sexually explicit and emotionally charged, of life as a gay man. This witty, sorrowful, and beautiful book is a classic of twentieth-century memoir.
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I Have a Date, Now What?

I Have a Date, Now What?

J R Mays

Word Inventions
2022
pokkari
I've written this book for those who want (or need) to chuckle at the dating life or--since their own has achieved a level of perfection unsurpassed in human history---the dating life of other folks. It might also appeal to readers who need a good cry...at all the goofs and gaffes they've contributed to the vast archives of dating misery. (Disclaimer: The author has NEVER experienced any such misery.) How to use I Have a Date, Now What? - Tweet out/post your newfound 'wisdom'. - Gift a friend with a copy. (Make sure you do it ASAP before it hits the best seller list. You wouldn't want to lose your 'trendsetter' status, would you? Who knows--it might even qualify you as an 'influencer'.) - Bring it on your next date. (Team up to avoid-or, for you risk-takers, reenact-the pitfalls highlighted in the book. Why not include one of the 'date escape' tips to close out the evening?) - Use I Have a Date's hints and warnings to set up a 'world's worst date' party. (I still shudder at my page on manscaping.) Enjoy
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I Am Andi

I Am Andi

J R Balthazar

Ruby Red
2022
sidottu
I Am Andi is the humorous, yet meaningful story of an adopted 11-year-old girl and her multi-racial family as they face life's ups and downs. She has two brothers who keep life interesting. Andi's older brother, Connor likes things his way. When he pushes her around, she's determined to stand up to him and her younger brother Brodie is more than happy to help her. Those attitudes change when a wacky new family moves into the neighborhood and Andi and her brothers must join forces to deal with them. Andi's adventurous spirit is always ready for the next new thing. See what happens when she and her BFF Tatum give a dance show for all the neighbors or when she decides to go into business for herself. From middle school cray to summer camp disatrophies, there's no shortage of action in Andi's world. She's having fun and learning some real lessons about the meaning of family, friendship and being true to herself. Andi is an entrepreneur, adventurer and burgeoning light worker whose exciting journey is just getting started.
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I Am Andi

I Am Andi

J R Balthazar

Ruby Red
2022
pokkari
I Am Andi is the humorous, yet meaningful story of an adopted 11-year-old girl and her multi-racial family as they face life's ups and downs. She has two brothers who keep life interesting. Andi's older brother, Connor likes things his way. When he pushes her around, she's determined to stand up to him and her younger brother Brodie is more than happy to help her. Those attitudes change when a wacky new family moves into the neighborhood and Andi and her brothers must join forces to deal with them. Andi's adventurous spirit is always ready for the next new thing. See what happens when she and her BFF Tatum give a dance show for all the neighbors or when she decides to go into business for herself. From middle school cray to summer camp disatrophies, there's no shortage of action in Andi's world. She's having fun and learning some real lessons about the meaning of family, friendship and being true to herself. Andi is an entrepreneur, adventurer and burgeoning light worker whose exciting journey is just getting started.
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Ruins of Change

Ruins of Change

J R Dwornik

Brain Lag
2011
pokkari
The Sword.Kina Ukiel enjoys a life that few would dare to brave. She's found her home amidst crumbling ruins, delving into their mysteries with little more than stories for guidance. Protected by mercenaries and tasked only with finding lost treasures, Kina has begun exploring the truths lost to history.Her latest adventure however turns up a strange sword which has been long lost since the time of Gods and Magic - an event in which the gods themselves waged war upon each other. A sword of such power is no small treasure and Kina finds herself contending with her former allies, an angered duke and the power of the gods themselves.With Kina's world rapidly changing, she's forced to face not only the dangers that she has returned to the world, but perhaps rediscover who she is.
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