Dark Signals
Dark Signals

Author: Si Dunn

Publisher:

Published: 2012-03

Total Pages: 252

ISBN-13: 9780985173500

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In August, 1964, a young U.S. Navy radio operator found himself in waters he had never heard of, participating in the expansion of a war in a nation he didn't know existed: Vietnam. What he learned from actions he witnessed and the classified messages he handled over the next 10 months left him shaken, disillusioned, and full of questions about America's responses to events in the Tonkin Gulf and South China Sea, including the rush to bomb North Vietnam and the Johnson Administration's decisions to vastly expand the presence of U.S. ground, air, and naval forces in Southeast Asia. Some within the U.S. 7th Fleet knew almost from the outset that the still-controversial "second attack" which triggered the 1964 Tonkin Gulf Resolution did not involve North Vietnamese PT boats firing on U.S. Navy destroyers in pitch-dark seas. What it did involve, others have since shown, was something simpler and much stranger. This is one sailor's memories of being present at the ragged beginnings of a long conflict that ultimately failed and cost 58,000 American lives.

Lighting for Driving: Roads, Vehicles, Signs, and Signals, Second Edition
Lighting for Driving: Roads, Vehicles, Signs, and Signals, Second Edition

Author: Peter Boyce

Publisher: CRC Press

Published: 2024-09-04

Total Pages: 435

ISBN-13: 1040106633

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Vehicle, road, sign, and signal lighting are provided to enable drivers to reach their destinations quickly and safely. However, the attention given to how these forms of lighting function is likely to change as new technology is introduced and understanding of ergonomics and human factors improves. Lighting for Driving: Roads, Vehicle, Signs and Signals, Second Edition shows the crucial role lighting plays in road safety and examines how it could be used more effectively. With light-emitting diodes (LEDs) becoming the lighting source of choice for transport planners and vehicle designers, this book integrates information on road lighting, vehicle lighting, signs, and signals in one handy volume. International in scope and updated for this new edition, this book features lighting examples from the USA, the UK, France, Germany, The Netherlands, Denmark, Sweden, Norway, Finland, Japan, Australia, and New Zealand. Lighting in common vehicle types including cars, vans, trucks, and motorcycles is covered as well as the visibility of pedestrians and cyclists to drivers. Coverage extends to road lighting, traffic markings, vehicle designs, and internal lighting and weather conditions. Now fully updated, a final chapter looks at the future of lighting in relation to driving. The book will help the reader to understand how lighting systems on roads and vehicles work by explaining the thinking and scientific reasoning behind various forms of lighting and analyzing their contribution to the driver’s understanding of real and potential road hazards. This book will be an ideal read for ergonomists and engineers engaged in transport and road engineering, transport planners, civil engineers, vehicle designers, and electrical engineers.

International Code of Signals
International Code of Signals

Author: Hydrographic Office

Publisher: BoD – Books on Demand

Published: 2012-08

Total Pages: 566

ISBN-13: 3954272091

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In the early 20th century the US "International Code of Signals" was a very progressive way for vessels to communicate important messages regarding matters of safety and navigation. The edition of 1907 contained three sections: the first part depicts urgent and important signals and all the tables of money, weights, barometric heights, etc., together with a geographical list and a table of phrases formed with the auxiliary verbs. The second part is an index. It consists of a general vocabulary and a geographical index. The third part gives lists of the United States storm-warning, life-saving, time-signal, and wireless telegraph stations, and of Lloyd's signal stations of the world. It also contains semaphore and distant signal codes and the United States Army and Navy and Morse Wigwag Codes. Reprint of the original edition.

Detection of Low-Level Optical Signals
Detection of Low-Level Optical Signals

Author: M.A. Trishenkov

Publisher: Springer Science & Business Media

Published: 2012-12-06

Total Pages: 481

ISBN-13: 9401512906

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This book is addressed to designers of photodetectors and photodetecting systems, designers of focal plane arrays, charge-coupled devices, specialists in IR technologies, designers of optoelectronic detecting, guiding and tracking systems, systems for IR direction finders, lidars, lightwave communication systems, IR imagers. All these specialists are united by one common purpose: they are all striving to catch the weakest possible optical signal. The most important characteristic of photosensitive devices is their detectivity, which determines the lowest level of optical signal they are able to detect above the noise level. These threshold characteristics define the most important tactical and technical parameters of the entire optoelectronic system, such as its range, resolution, precision. The threshold characteristics of optoelectronic system depend on many of its components; all designers agree, however, that the critically responsible part of the system is the photodetector [1]. By the end of the 1960s the physicists and the engineers were able to overcome many obstacles and to create photodetectors (at least single-element or few-element ones) which covered all the main optical bands (0. 4 . . . 2,2 . . . 3, 3 . . . 5,8 . . . 14 J. . Lm), carried out the detection almost without any loss (the quantum yield being as high as 0. 7 . . . 0. 9), and reduced the noise level to the lowest possible limit.