Results 211 to 220 of about 444,589 (264)
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Annals of the New York Academy of Sciences, 1975
Parasitic protozoa and bacteria transmitted by vector insects and ticks resist destruction in the intermediate host, possibly through the possession of antigens similar to those of the host. There is no evidence that symbiotic microorganisms have evolved similar eclipsed antigens.
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Parasitic protozoa and bacteria transmitted by vector insects and ticks resist destruction in the intermediate host, possibly through the possession of antigens similar to those of the host. There is no evidence that symbiotic microorganisms have evolved similar eclipsed antigens.
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Attenuation and attenuationâanisotropy in laminated rocks
SEG Technical Program Expanded Abstracts 2009, 2009Summary Elastic contrast in porous rock with fluid leads to irreversible seismic energy loss. This occurs in laminated intervals with individual layers much smaller than the seismic wavelength, even if the intrinsic attenuation in each single layer is zero.
Kaushik Bandyopadhyay +2 more
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Psychometrika, 1958
A significance test is proposed for determining whether a correlation coefficient is less than unity by an amount greater than that attributable to errors of measurement.
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A significance test is proposed for determining whether a correlation coefficient is less than unity by an amount greater than that attributable to errors of measurement.
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Double step attenuation measurement technique for high attenuation of variable attenuators
2012 Conference on Precision electromagnetic Measurements, 2012An accurate solution of a double step attenuation measurement technique with an internal gauge block for variable attenuators is presented. The solution is obtained by solving the signal flow graph of the circuit model with a small reflection coefficient (<0.1) on each I/O port. Experimental results both of low and high attenuation values show good
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A Standard Attenuator and the Precise Measurement of Attenuation
IEEE Transactions on Instrumentation and Measurement, 1964An attenuator calibration system is described consisting of a waveguide-beyond-cutoff attenuator operating at 31.25 Mc and electronic equipment designed for parallel-substitution, series-substitution, and heterodyne measurements. Radio-frequency power is supplied by a crystal-controlled signal generator, stabilized so that variations in the power ...
D. L. Hollway, F. P. Kelly
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Corrections to the attenuation constants of piston attenuators
Proceedings of the IEE - Part III: Radio and Communication Engineering, 1949The modes existing in a circular waveguide with walls of finite conductivity are investigated and expressions derived for the corrections to the attenuation constant of a piston attenuator. The correction is negligible for E-modes but may be of importance in work of the highest accuracy when H-modes are used.
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Attenuated hypothesis or attenuated test of hypothesis?
Intelligence, 1985Abstract After discussing several of the criticisms made by Professor Jensen, it is concluded that the Spearman hypothesis, as currently worded, has been disconfirmed. The near-zero correlation between blacks and low socio-economic status (SES) whites is not an artifact of the methodology. Neither is it a sampling fluke.
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Filtering Attenuator with Electronically Tunable Attenuation
2021 IEEE MTT-S International Microwave and RF Conference (IMARC), 2021Biswajit Pal +3 more
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