Creation and electrical properties of p-Cu2ZnSnS4/n-Si heterojunctions

Technical Physics Letters - Anisotype p-Cu2ZnSnS4/n-Si heterojunctions have been manufactured for the first type by sulfidation of base-metal layers predeposited onto polycrystalline silicon...     

CaGa<Subscript>2</Subscript>Se<Subscript>4</Subscript>–GaSe system

The phase relations in the CaGa₂S₄–GaSe system have been studied using differential thermal analysis, X-ray diffraction, microstructural analysis, microhardness tests, and density measurements, and its T–x phase diagram has been mapped out. The CaGa₂S₄–GaSe system has been shown to be a pseudobinary join of the ternary system Ca–Ga–Se. The CaGa₂S₄–GaSe system has been found to contain limited solid solutions based on the constituent selenides. The electrical conductivity of CaGa₂S₄ has been measured and its current–light behavior and photoelectric properties have been studied.     

Perfect aggregation of information in two-person multistage games with fixed sequence of moves and aggregated information on partner’s choice

Two-person multistage game with fixed sequence of moves is considered, under perfect information on existing history of the game and aggregated information on the current move of player 2. Having this information at each stage i, player 1 is the first to choose his move x(in1)(.); moreover, in the beginning of the game player 1 announces his strategy x(.)=(a(in1)(.),..., x(in)(.)) for n future stages. Given information regarding the choice of player 1 and history of the game, player 2 strives to maximize his payoff function via the strategy v=(v(in1), v(in2),..., v(inn)). In this paper the sufficient conditions of perfect aggregation, involving certain results from the theory of Lie groups, are provided for the game in question.     

Experimental reprocessing of waste cast-iron chips to the powder form

We have studied the possibility of producing powders from gray cast-iron chips formed during the production of home air conditioners. The particle morphology, structure, physicotechnical, mechanical, and antifriction properties of the cast iron powder are studied and compared to those of powdered iron. It is shown that the sample obtained from the cast-iron powder have worse mechanical properties than the samples prepared from iron but they have better antifriction properties than the latter.Bakkonditsioner Scientific-Industrial Complex. Translated from Poroshkovaya Metallurgiya, No. 2(362), pp. 93–98, February, 1993.     

The Heat Transfer of Streams of Finely Divided Media in Channels Separated by a Permeable Partition

A mathematical model is suggested of convective heat transfer between streams of finely divided media under conditions of flow in the channels of a valve-type pulsating-flow heat exchanger, which are separated by a permeable partition. The heat and mass transfer occurs by way of multiple transverse exchanges of continuous phases between streams when developing sign-variable pressure differences between these streams. The interphase heat transfer in dispersed flows is taken into account, assuming that the particles are isothermal and their temperature is defined by external heat transfer on the particle surface.     

N-type negative differential resistance, hysteresis, and oscillations in the current-voltage characteristics of microwave diodes

The dc current-voltage characteristics of microwave diodes are experimentally studied on simultaneous exposure of the diodes to a high-frequency (100 MHz) high-amplitude harmonic signal. In the current-voltage characteristics of the microwave diodes, regions of N-type negative differential resistance, hysteresis, and current oscillations are observed depending on the amplitude and frequency of the high-frequency signal. A comparative analysis of the experimentally observed effects is performed, and possible mechanisms for the effects are discussed.