General Telephone Company of Alabama (February 1982) PDF Download
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Author: General Telephone Company of Alabama
Publisher:
ISBN:
Category :
Languages : en
Pages :
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Book Description
Listings for more area communities than in the phone service book.
Author: General Telephone Company of Alabama
Publisher:
ISBN:
Category :
Languages : en
Pages :
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Book Description
Listings for more area communities than in the phone service book.
Author: National Institute for Occupational Safety and Health
Publisher:
ISBN:
Category : Industrial hygiene
Languages : en
Pages : 688
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Book Description
Cumulative catalog of all National Institute for Occupational Safety and Health (NIOSH) numbered publications, health hazard evaluations (HHE) and technical assistance (TA) reports, contract reports, and other educational and training materials.
Author:
Publisher:
ISBN:
Category : Statistics
Languages : en
Pages : 1104
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Book Description
Author:
Publisher:
ISBN:
Category : Business consultants
Languages : en
Pages : 242
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Book Description
Author:
Publisher:
ISBN:
Category : Administrative law
Languages : en
Pages : 1828
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Book Description
Author: United States. National Labor Relations Board
Publisher:
ISBN:
Category : Labor laws and legislation
Languages : en
Pages : 1462
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Book Description
Author: United States. Superintendent of Documents
Publisher:
ISBN:
Category : Government publications
Languages : en
Pages : 1066
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Book Description
Author: Russ Gundrum
Publisher: Russ Gundrum
ISBN:
Category : Technology & Engineering
Languages : en
Pages : 61
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Book Description
In less than 100 years, the power and telecommunications industries have become highly technological and competent in servicing the growing electrical power and communication needs of a complex, modern society. This tremendous advancement has not been without problems of mutual compatibility, however. In the early days of power and telecommunication transmission, fundamental incompatibilities existed between the two systems since both used the earth as a ground return conductor. As the length of both systems' lines grew and the number of subscribers increased, the inductive interference problems became more severe. Further expansion of both industries was seriously threatened when it became necessary to refer these problems to the courts and commissions for resolution, such as California's General Order 52 issued in 1912. As a consequence, representatives from both industries joined in cooperative efforts to study and resolve the main causes of incompatibility. This joint effort, primarily between the Edison Electric Institute and the Bell System, resulted in over fifty engineering reports during the 1920's and 30's. This cooperation resulted in numerous advances and innovations, with the primary development being paired conductors enclosed in metallic shielded cables for telecommunications transmission. Developments such as drainage reactors, longitudinal chokes, neutralizing transformers and isolation transformers also occurred and were applied to open wire lines to suppress power line interference. The above practices and procedures were usually adequate in solving most electromagnetic and electrostatic induced voltage and current problems. However, in the 1960's and 70's certain design features and trends in the environment occurred that presented new and challenging problems in the area of incompatibility. As a result, the Institute of Electrical and Electronic Engineers (IEEE) formed the Inductive Coordination and Electrical Protection (ICEP) Committee to provide effective execution of the following considerations: 1) Design of systems to minimize inductive interference and susceptibility. 2) Adopt standards and guidelines relating to interference. 3) Establish a continuing dialog between interested parties to provide a medium for exchanging information in the advanced planning stages of new facilities. In the meantime, some manufacturers have responded to the industry's need for equipment similar to that used in the open wire days, but better designed and more economical for cable applications. Information on these devices is provided in the later chapters of this manual.
Author: United States. Congress. House. Committee on the Judiciary. Subcommittee on Courts, Civil Liberties, and the Administration of Justice
Publisher:
ISBN:
Category : Eavesdropping
Languages : en
Pages : 572
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Book Description
Author: Glenn E. Peterson
Publisher: AIAA
ISBN: 9781563473531
Category : Science
Languages : en
Pages : 622
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Book Description
The potential threat posed by Leonid meteroids to orbiting spacecraft over the next several years calls for new dynamic mitigation strategies to assist the satellite community in reducing the danger to its vehicles. This book offers deliberate dynamic mitigation strategies to complement the traditional shielding strategies, providing mission operators additional ways to decrease the danger. Five different attitude control and orbit maneuvering options are examined in detail. The information is presented in algorithmic form to allow technically competent, but meteoroid inexperienced, operators to easily understand the phenomena, assess the danger, and implement procedures. Although general in scope, the book emphasizes the Leonid meteor events of the 1998-2002 timeframe.
