摘要:

ABSTRACTThe class of short circuit conductance matrices realizable as n-port resistive networks is extended in this paper using generalized tree terminal graphs. In Part I, the realization is done in terms of PL tree terminal graphs. Necessary and sufficient conditions are given so that the tree terminal graph corresponding to a given short circuit conductance matrix is a PL tree. These conditions are based entirely on the sign pattern of the entries of the short circuit conductance matrix. Also the necessary and sufficient conditions for the realizability are stated.In Part II, the general question of realizability, determination of an appropriate tree terminal graph and the complete realization of a short circuit conductance matrix are discussed. No tree transformations are used in the realization procedure.

ISSN:0377-2063    

DOI:10.1080/03772063.1967.11485483

出版商:Taylor&Francis    

年代:1967

数据来源: Taylor

摘要:

ABSTRACTThe fluctuation theory of luminance discrimination developed initially for the dark-adapted eye can be very easily extended to the light-adapted eye. Using this theory luminance thresholds have been derived as a function of the adaptation luminance level. Theoretical derivations have been checked against experimental data from literature. Using these luminance thresholds and statistical area properties of television pictures, natural contrast limitations of the slow eye have been derived as a function of average scene luminance. It is pointed out that exact calculations of the gray scale capacity can be done for slow eye. Gray scale capacity of neither very slow nor very fast eye has been calculated under some convenient assumptions.

ISSN:0377-2063    

DOI:10.1080/03772063.1967.11485484

出版商:Taylor&Francis    

年代:1967

数据来源: Taylor

摘要:

ABSTRACTIn the present communication, the Voltage Standing Wave Ratio (VSWR) measurements at frequencies from 2500 to 3200 Mc/s. made on a dielectric loaded conical helix Antenna designed, developed and tested by author are presented. The measurements show that this antenna can transmit 75 per cent power over a bandwidth of about 125 Mc/s. and about 89 per cent of power for a bandwidth of about 45 Mc/s. A brief mention of the helix antenna used for receiving Telemetered data from Naval Research Laboratory Satellite at 136 Mc/s. is also made.

ISSN:0377-2063    

DOI:10.1080/03772063.1967.11485485

出版商:Taylor&Francis    

年代:1967

数据来源: Taylor

摘要:

ABSTRACTThe effect of antenna aperture on the reception of cosmic radio noise is considered and it is shown that with the arrangement used at Ahmedabad, the ionospheric aperture and wedge refraction due to horizontal gradients of ionization do not introduce any significant attenuation.

ISSN:0377-2063    

DOI:10.1080/03772063.1967.11485486

出版商:Taylor&Francis    

年代:1967

数据来源: Taylor

ISSN:0377-2063    

DOI:10.1080/03772063.1967.11485487

出版商:Taylor&Francis    

年代:1967

数据来源: Taylor

ISSN:0377-2063    

DOI:10.1080/03772063.1967.11485488

出版商:Taylor&Francis    

年代:1967

数据来源: Taylor

ISSN:0377-2063    

DOI:10.1080/03772063.1967.11485490

出版商:Taylor&Francis    

年代:1967

数据来源: Taylor

ISSN:0377-2063    

DOI:10.1080/03772063.1967.11485492

出版商:Taylor&Francis    

年代:1967

数据来源: Taylor

ISSN:0377-2063    

DOI:10.1080/03772063.1967.11485493

出版商:Taylor&Francis    

年代:1967

数据来源: Taylor

ISSN:0377-2063    

DOI:10.1080/03772063.1967.11485494

出版商:Taylor&Francis    

年代:1967

数据来源: Taylor