Detonation logic elements

We consider the classification of detonation logic elements (DLE), that is, devices in which logical operations are effected by means of explosive signals. The technical implementation of the DLE studied is based on the physical principle of the “corner effect.” Methods of describing the functional properties of DLE using Boolean functions are analyzed. Examples are given of the application of Boolean functions to detonation elements of single-step and two-step logic. Institute of Specialized Mechanical Engineering, N. é. Bauman Moscow State Technical University, Moscow 107005. Translated from Fizika Goreniya i Vzryva. Vol. 30, No. 5, pp. 123–126, September–October, 1994.     

Ignition of gas suspensions of metallic powders in reflected shock waves

Novosibirsk. Translated from Fizika Goreniya i Vzryva, Vol. 25, No. 2, pp. 67–74, March–April, 1989.     

Certain effects of biaxial elastoplastic deformation of a plate with a crack

Elastoplastic deformation of a circle with a center crack with radial displacements distributed according to an elliptical rule specified on its boundary is considered. The Dugdale model of a crack is used. The numerical and approximate analytical solutions obtained are compared with one another. A relationship of crack opening and size of the plastic area at its tip to the parameter of biaxial loading, as which is used the ratio of the displacements on the main axes of deformation of the plate, is revealed. The possibiity of stable crack growth is established.Translated from Problemy Prochnosti, No. 6, pp. 20–27, June, 1990.     

Novel atropisomeric binaphthol containing comb-shaped copolymers forming chiral nematic phases

Novel comb-shaped liquid crystalline acrylic copolymers consisting of nematogenic methoxy-phenylbenzoate acrylic monomers (A) together with novel chiral binaphthol (BN) methacrylic monomers (MB-m) were synthesized in this study. The prepared copolymers differ in spacer lengths of MB-m (m = 3, 5, 11) and in their compositions. The homopolymers of the three new chiral BN monomers MB-m were also prepared. Copolymers with a low concentration of BN monomeric units (less than 16 mol %) display a cholesteric mesophase. The induced chirality in the polymers is due to atropisomerism (chirality due to hindered rotation around single bonds) of the BN molecules. The helical twisting power β (HTP) caused by the atropisomeric units in the synthesized copolymers was shown to decrease significantly on heating. The unusually high negative temperature coefficient of HTP observed above the glass transition temperature (T_g) could be explained in terms of conformational changes of the BN molecules in the copolymers.     

Thermophysical properties and superconductivity of the metal oxide Y-Sm-Ba-Cu-O

We have studied the specific heat capacity and the coefficient of thermal conductivity for the superconductive ceramic Y_0.8Sm_0.2Ba₂Cu₃O_x in the temperature range 4.2–300 K.Translated from Inzhenerno-Fizicheskii Zhurnal, Vol. 57, No. 6, pp. 885–888, December, 1989.     

Physicomechanical state of the plate in diffusion saturation with nonlinear diffusion

Translated from Fiziko-Khimicheskaya Mekhanika Materialov, Vol. 25, No. 2, pp. 42–45, March–April, 1989.