Climate control through ionization     

Thomas L. Martin Jr. 《Journal of The Franklin Institute》1952

This paper summarizes some of the experimental evidence of the apparent biological effects produced by atmospheric ionization. Thermionic ion sources are discussed and the results of experimental determinations of their characteristics are presented.  相似文献   

On stochastic differential equations with non-white noise having small correlation times     

Menelaos Lambiris  Martin Leibowitz 《Journal of The Franklin Institute》1980,309(1):55-64

This is an extension of an earlier paper by the second author. In the previous work, an algorithm was derived for the moments of an homogeneous equation with noise similar to the white noise, but has small, finite correlation time. In the present work this algorithm is extended for an inhomogeneous equation with the same characteristics. Previous notation has been kept throughout the paper.  相似文献   

The effective path length through a vertical cosmic-ray telescope     

Enós E. Witmer  Martin A. Pomerantz 《Journal of The Franklin Institute》1948,246(4):293-309

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Secondary electron emission from oxide-coated cathodes     

Martin A. Pomerantz 《Journal of The Franklin Institute》1946,241(6):415-433

The secondary electron emission from alkaline-earth oxide-coated cathodes has been investigated under both continuous and pulsed bombardment. Various factors affecting the yield, such as dependence upon primary voltage, collecting voltage, temperature, time, and angle of incidence, are noted, and the present state of the theory is discussed.Experiments have been performed with three types of apparatus. Yield vs. Energy data reveal values of δ of 4–7 at room temperature, with a more or less flat maximum at approximately 1,000 volts primary energy.The yield increases with temperature in an exponential manner, and plots of log Δδ (i.e. δ_K° ? δ_300°K) vs. 1/T give straight lines. Values of Q₁ between 0.9 – 1.5 eV. are generally indicated, and from extrapolation of these curves, yields exceeding 100 at 850° C. are deduced. The secondary emission depends upon the degree of activation, and increases with enhancement of the thermionic emission characteristics. Short-time effects such as growth or decay of secondary current after the onset of primary bombardment or persistence after the cessation of bombardment have not been observed, and values of yield obtained by pulsed methods are in accord with those obtained under D.C. conditions. Tail phenomena reported by J. B. Johnson and interpreted as “enhanced thermionic emission” from oxidecoated cathodes become manifest only under experimental conditions characterized by certain space-charge effects, and have been effectively simulated by bombarding a tantalum target adjacent to an electron-emitting tungsten filament. Various measurements of the energy distribution of secondary electrons as a function of primary voltage and temperature have been obtained. It was observed that the average energy of the secondary electrons decreases with temperature at a rate which more than compensates for the increase in the number of secondaries emitted per incident primary. The mechanism of the observed dependence of yield upon temperature is not well understood. Various alternative explanations are discussed and, in the light of the present state of our knowledge, regarded as untenable.  相似文献   

New “magic carpet”: New Edition American Chemical Society,Vol. 18, No. 16     

Martin A. Pomerantz 《Journal of The Franklin Institute》1940,230(6):798-799

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The bible after criticism     

Hugh Martin 《British Journal of Religious Education》1938,5(2):73-79

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Buchbesprechungen     

Wilhelm Sch?nzer  Mario Thevis 《Sportwissenschaft》2009,39(1):74-78

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What's on second     

Martin Tessmer 《Performance Improvement》1988,27(9):6-8

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Effects of race and social class on preschool performance on the developmental test of visual-motor integration     

Roy Martin  Trevor Sewell  John Manni 《Psychology in the schools》1977,14(4):466-470

The visual-motor integration of preschool children who varied in terms of race, sex, and socioeconomic status was assessed using the Beery-Buktenica Test of Visual-Motor Integration (VMI). An analysis of covariance revealed that there were significant main effects for race, sex, and socioeconomic status. Since, at the three- and four-year level, the VMI was normed only on white suburban children, the results of this study seemed to indicate the need for norms for black children at the preschool level. Thus, the second part of this paper reports normative data for black preschool children on the VMI.  相似文献   

Membership news     

Daun Hackett Martin 《Performance Improvement》1979,18(2):13-13

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