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The temperature dependence of the threshold current in electron-beam-pumped (EBP) lasers using p-type GaAs (2 1.0 cm) at 27 kV is theoretically determined, taking into account the inhomogeneous distribution and the temperature dependence of the lifetime of the excess carriers. The computed dependence is found to be in excellent agreement with the experimental observation. A comparison is then made of the result with results obtained under different assumptions to confirm positively that, in the study of the performance of these lasers, the above two features cannot be ignored.
The purpose of the present communication is to determine the influence of the inhomogeneous distribution of the minority carriers on the temperature dependence of the threshold current in EBP lasers using p-type GaAs (2 10 cm) at 27 kV, taking due consideration of the variation of the recombination lifetime with temperature. [ABSTRACT FROM AUTHOR]

It has been shown that the average climatic chart, being based upon a topographic approximation to the true ground surface, is no more accurate than that approximation and cannot be adequately interpreted without it. Methods have been suggested for formalizing the approximative processes so as to reveal the most significant characteristics of the actual climatic distributions. These methods may be applied with benefit wherever a climatic element is affected by topography, even in areas of low relief. Applying this procedure to the description of the mean temperature of the Guinea highlands of West Africa, maps have been constructed which show the distribution of mean temperature in a fashion which gives it more meaning for he geographer. [ABSTRACT FROM AUTHOR]

Explains the difference of the physical principles between air temperatures over land and over sea. Implications of the principles for the distribution of air temperature in the coastal zones on land; Profiles of means of observed temperature drawn inland from the coast at three places in the U.S.; Function of horizontal distance from the coast.