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Your search keyword '"BANDWIDTHS"' showing total 7 results
Start Over Descriptor "BANDWIDTHS" Publication Year Range More than 50 years ago
7 results on '"BANDWIDTHS"'

1. When Do We Get Television?

Subjects
TELEVISION, TELEVISION broadcasting, BANDWIDTHS, OPERATING costs, ECONOMICS
Abstract

The article discusses the economic and technical problems that are hindering the achievement of higher definition of television for a mass audience in the U.S. One of the economic obstacles is the high costs of building and operating transmitters with enough power to use higher frequencies. On the other hand, one of the technical problems is the need to increase the number of lines which would mean increasing the width of the band required for broadcasting.

Published
1937

2. Biorhythms and Activity Level of Institutionalized Mentally Retarded Persons Diagnosed Hyperactive.

Author

Wade, Michael G.

Subjects
BIOLOGICAL rhythms, CHILDREN with intellectual disabilities, HYPERACTIVE children, BEHAVIOR, NOISE, BANDWIDTHS
Abstract

The article evaluates the biorhythms and activity level of institutionalized mentally retarded children diagnosed as hyperactive. The study shows that a variety of biorhythms with no clear bandwidths indicated was produced by the power spectra of the play sessions. Frequencies slower than 15 minutes per cycle indicated no clear periodic components with respect to levels of group size or sex. There is also an indication of a great deal of random noise behavior.

Published
1973

3. THE SYNCHRONIZATION OF TRAFFIC SIGNALS BY MIXED-INTEGER LINEAR PROGRAMMING.

Author

Little, John D. C.

Subjects
TRAFFIC signs & signals, DATA transmission systems, INTEGER programming, BANDWIDTHS, LINEAR programming, SPECTRUM allocation, ALGORITHMS, DIGITAL communications
Abstract

Traffic signals can be synchronized so that a ear, starting at one end of a main artery and traveling at preassigned speeds, can go to the other end without stopping for a red light. The portion of a signal cycle for which this is possible is called the bandwidth for that direction. A mixed-integer linear program is formulated for the following arterial problem: Given (1) an arbitrary number of signals, (2) the red-green split at each signal, (3) upper and lower limits on signal period, (4) upper and lower limits on speed between adjacent signals, and (5) limits on change in speed, find (1) common signal period, (2) speeds between signals, and (3) the relative phasing of the signals, in order to maximize the sum of the bandwidths for the two directions. Several variants of the problem are formulated, including the problem of synchronizing a network of signals. Branch-and-bound algorithms are developed for solving the mixed-integer linear programs by solving sequences of ordinary linear programs. A 10-signal arterial example and a 7-signal network example are worked out. [ABSTRACT FROM AUTHOR]

Published
1966
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4. Celestial Maser?

Subjects
SOLAR radio emission, BANDWIDTHS, POLARIZATION (Sound), ASTRONOMERS
Abstract

The article announces that Massachusetts Institute of Technology and its associated Lincoln Laboratory astronomers have reported finding celestial radio emission that is narrower in bandwidth and more strongly polarized than any previously observed. The source of the emission is designated W3, one of H II regions that are strong emitters of radio energy.

Published
1966

5. That Radio Channel Plan Is Here.

Subjects
BROADCASTING industry, BANDWIDTHS, ASSOCIATIONS, institutions, etc.
Abstract

The article examines the proposed reallocation of wavelengths and power boosts submitted to the U.S. Federal Communications Commission's (FCC) Broadcast Division in January 1937. The likelihood of superpower broadcasting is introduced. Possible approval of 50,000 watts as minimum required rather than the maximum allowed a station with exclusive use of a clear channel is also cited. Also being considered is the opening of the high frequency band from 1,500 to 1,600 kilocycles for regular broadcasting.

Published
1937

6. Spectrum-Splitter.

Subjects
SPECTRUM allocation, WIRELESS communications policy, BROADCASTING policy, BANDWIDTHS, CONFERENCES & conventions
Abstract

The article focuses on the task of Radio Technical Planning Board Chairman Walter Ransom Gail Baker to report its recommendations on spectrum allocation at the conference of the U.S. Federal Communications Commission. It notes that the success of the report would be the basis for the division of air waves and the development of the radio. Also included are the argument over high-frequency spectrum between television and frequency modulation and a brief overview of Baker's academic background.

Published
1944

7. A New Tool for Biotelemetry-- Phase Coherent Tracking.

Author

Ingle, Glenn F. and Baldwin, Howard A.

Subjects
BIOTELEMETRY, ELECTRONIC measurements, DETECTION of electric discharges, BANDWIDTHS, SURFACE discharges (Electricity), TECHNOLOGICAL innovations, FREQUENCY changers, SENSORY receptors, ELECTRIC oscillators
Abstract

The article discusses about phase coherent tracking. According to the article, in terms of space and long-range telemetry, coherent detection techniques have become one of its most essential tools. It was said that in biotelemetry, there are two areas where improvement might be made with the help of coherent detection as applied to biotelemetry. Among those are the enhancement of receiver sensitivities because of smaller bandwidths achievable with coherent detection a precise method of identifying direction without resorting to rotating loop direction finding.

Published
1968
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