David A. Hill – författare

Wild birds are counted for a wide variety of reasons and by a bewildering array of methods. However, detailed descriptions of the techniques used and the rationale adopted are scattered in the literature, and the newcomer to bird census work or the experienced bird counter in search of a wider view, may well have difficulty in coming to grips with the subject as a whole. While not an end in itself, numerical and distributional census work is a fundamental part of many scientific and conservation studies, and one in which the application of given standards is vital if results are not to be distorted or applied in a misleading way.This book provides a concise guide to the various census techniques and to the opportunities and pitfalls which each entails. The common methods are described in detail, and illustrated through an abundance of diagrams showing examples of actual and theoretical census studies. Anyone with a bird census job to plan should be able to select the method best suited to the study at hand, and to apply it to best effect within the limits inherent in it and the constraints of the particular study.The Royal Society for the Protection of Birds and the British Trust for Ornithology have for many years pioneered the collaboration of amateurs and professionals in various census studies. Three members of their staff, each with extensive field experience, now pool the knowledge of these investigations to lay the groundwork for sound census work in future years.

In this book there are entire chapters devoted to the most widely used bird counting techniques, and attempts to amalgamate other counting methodologies into major groups were made. Examples of the use of methods are provided wherever possible and the relative value of various approaches for answering specific questions is also addressed. A newly revised edition of the immensely successful Bird Census Techniques An entirely new chapter covering the census methods recommended for tropical habitats Provides a concise guide to various census techniques and their opportunities and pitfalls

A thorough and rigorous analysis of electromagnetic fields in cavities This book offers a comprehensive analysis of electromagnetic fields in cavities of general shapes and properties.Part One covers classical deterministic methods to conclude resonant frequencies, modal fields, and cavity losses; quality factor; mode bandwidth; and the excitation of cavity fields from arbitrary current distributions for metal-wall cavities of simple shape.Part Two covers modern statistical methods to analyze electrically large cavities of complex shapes and properties.Electromagnetic Fields in Cavities combines rigorous solutions to Maxwell's equations with conservation of energy to solve for the statistics of many quantities of interest: penetration into cavities (and shielding effectiveness), field strengths far from and close to cavity walls, and power received by antennas within cavities. It includes all modes and shows you how to utilize fairly simple statistical formulae to apply to your particular problem, whether it's interference calculations, electromagnetic compatibility testing in reverberation chambers, measurement of shielding materials using multiple cavities, or efficiency of test antennas. Electromagnetic Fields in Cavities is a valuable resource for researchers, engineers, professors, and graduate students in electrical engineering.

A thorough and rigorous analysis of electromagnetic fields in cavities

This book offers a comprehensive analysis of electromagnetic fields in cavities of general shapes and properties.

Part One covers classical deterministic methods to conclude resonant frequencies, modal fields, and cavity losses; quality factor; mode bandwidth; and the excitation of cavity fields from arbitrary current distributions for metal-wall cavities of simple shape.

Part Two covers modern statistical methods to analyze electrically large cavities of complex shapes and properties.

Electromagnetic Fields in Cavities combines rigorous solutions to Maxwell''s equations with conservation of energy to solve for the statistics of many quantities of interest: penetration into cavities (and shielding effectiveness), field strengths far from and close to cavity walls, and power received by antennas within cavities. It includes all modes and shows you how to utilize fairly simple statistical formulae to apply to your particular problem, whether it''s interference calculations, electromagnetic compatibility testing in reverberation chambers, measurement of shielding materials using multiple cavities, or efficiency of test antennas. Electromagnetic Fields in Cavities is a valuable resource for researchers, engineers, professors, and graduate students in electrical engineering.

Award-winning original fiction for learners of English. At seven levels, from Starter to Advanced, this impressive selection of carefully graded readers offers exciting reading for every student''s capabilities. Paul Morris''s happy life in Italy changes when his wife dies suddenly. He develops a relationship with Sandra, a friend at work, but everything is not as it seems. How can Sandra afford such an expensive car? And why does she keep making mysterious phone calls? Soon Paul is involved in international crime and a thrilling car chase across Europe. Paperback-only version. Also available with Audio CDs including complete text recordings from the book.

Award-winning original fiction for learners of English. At seven levels, from Starter to Advanced, this impressive selection of carefully graded readers offers exciting reading for every student''s capabilities. One icy winter''s evening in Budapest, John Taylor is on his way home from the office when a man runs into him and knocks him over. The man turns to say sorry and John is amazed at what he sees: the man is John''s double. The double rushes away but leaves no footprints in the snow. Over the next year it becomes clear to John that the meeting was no accident and that his double has a very important message to give him. Paperback-only version. Also available with Audio CDs including complete text recordings from the book.

As it becomes ever more expensive to purchase land for conservation purposes, it is becoming increasingly important both to manage existing sites properly, and to create new habitats. This comprehensive volume provides a pragmatic, habitat by habitat guide to conservation management, in which the prescriptions and methods are based upon sound science coupled with practical experience. For each habitat, the book guides the reader through the options and solutions, shows the problems to look out for, and gives good and bad examples of habitat management in the past. This will be a must for all practising ecologists, land managers, wardens, landscape architects and conservationists, and will provide a valuable reference for students of ecology, conservation and environmental science.

Cambridge English Readers is an award-winning series of original fiction readers for learners of English, offering exciting reading from Starter to Advanced levels. "One icy winter's evening in Budapest, John Taylor is on his way home from the office when a man runs into him and knocks him over. The man turns to say sorry and John is amazed at what he sees: the man is John's double. The double rushes away but leaves no footprints in the snow. Over the next year it becomes clear to John that the meeting was no accident and that his double has a very important message to give him. Also available with downloadable audio."

Cambridge English Readers is an award-winning series of original fiction readers for learners of English, offering exciting reading from Starter to Advanced levels. "Paul Morris's happy life in Italy changes when his wife dies suddenly. He develops a relationship with Sandra, a friend at work, but everything is not as it seems. How can Sandra afford such an expensive car? And why does she keep making mysterious phone calls? Soon Paul is involved in international crime and a thrilling car chase across Europe.Contains adult material which may not be suitable for younger readers. Paperback-only version. Also available with downloadable audio. "