The effect of pressure on light and heavy hole masses in GaAs is studied. A theoretical calculation of the dependence of the hole masses on pressure is carried out taking into account the influence of the lowest conduction band levels I ? : andThe experimental values are obtained from the change of the tunnel diode characteristics with pressure. The agreement of the calculated values with the experimental data is good for the light holes.Der EinfluB des Druckes auf die effektiven Massen der leichten und schweren Locher in GaAs wird untersucht. Eine theoretische Berechnung der Abhlingigkeit der Uchermasse vom Druck wird unter Beriicksichtigung des Einflusses der tiefsten Leitungsband-Niveaus I?: and l?f6 durchgefiihrt. Experimentelle Werte werden aus den Veriinderungen der Tunneldioden-Kennlinien mit dem Druck erhalten. Cute Obereinstimmung der berechneten mit experimentellen Werten wird fiir die leichten Locher gefunden.

The physical origin of the excess currents in the low temperature I-U characteristics of GaAs Schottky barriers is investigated. It is found that the excess current in the low forward bias range is due to the generation of lattice defects near the metal-semiconductor interface by irradiation, thermal annealing, and external deformation. The defects produce trap levels in local parts of the space-charge region. On the basis of experimental results and a theoretical analysis it is shown that resonant tunneling assisted by deep centers is the most probable transport mechanism. l) Revolution Square 1, 634050 Tomsk, USSR.

Globoid worm gears have been widely applied in a range of technological branches in which other types of worm gears are less effective. The main functional indicators which facilitated their popularity include high load capacity and durability, low vibroactivity and small energy losses. As the experience of application and the results of the study of globoid worm gears showed, the level of operational properties of globoid gears is higher than that of the others only if the gearing and technological parameters of their manufacturing are optimally chosen during the design stage. This paper describes a method for estimating the gearing parameters of a globoid gear with an account of the geometry of the elements (the geometry of the teeth of the wheel and the worm thread), namely the calculation of the gap fields in the globoid gearing by means of numerical methods.