Numerical solution of multipoint problems in statics of shells

We purpose an approach to solving multipoint boundary-value problems for a system of ordinary differential equations in the theory of shells. The technique is based on reduction of the original problem to several two-point boundary-value problems, which are solved by a stable numerical method. Examples of calculation of variable-thickness cylindrical shells are given.Translated from Vychislitel'naya i Prikladnaya Matematika, No. 64, 58–65, 1988.     

Possible use of recombination for selective effects on the populations of excited atomic and ionic levels. I

Studies of recombination in a plasma of moderate density are reviewed. Conclusions are drawn regarding the possible use of ternary recombination to produce elevated populations of high-lying excited atomic and ionic levels and regarding the conditions in a gas-discharge plasma which provide the sharpest differences among these populations, with the higher-lying levels populated predominantly. There are additional recombination processes which could produce elevated populations in certain cases in the high-lying excited levels of atoms and ions haying displaced levels: radiationless two-particle recombination and ternary recombination of ions formed by the stripping of an electron from an inner shell.Translated from Izvestiya Vysshikh Uchebnykh Zavedenii Fizika, No. 3, pp. 104–111, March, 1971.     

Axisymmetric contact of anisotropic shells of rotation with rigid and elastic foundations

A class of problems are investigated on determining the stressed-strained state of anisotropic shells of rotation that are in axisymmetric one-sided contact with rigid and elastic surfaces. The shells are under the action of surface and contour loads. For some combinations of these quantities the shell may break away from the surface. To determine the contact zone, the method of successive approximations is utilized. In contrast to most investigations in which the contact zone is first determined, the method proposed makes use of a special quantity characterizing the size of the contact zone. The load on contours is determined from the solution to the problem on the stressed state of the shell and the condition specified on the boundary of the contact zone. Some examples of solving concrete problems are given. Bibliography: 5 titles. Translated fromObchyslyuval’ na ta Prykladna Matematyka, No. 76, 1992, pp 70–74.     

Odoriferous substances of the mycelial fungus Ashbya gossypii

All-Union Scientific-Research Institute of Essential-Oil Crops, Simferopol'. Translated from Khimiya Prirodnykh Soedinenii, No. 3, p. 428, May–June, 1991.     

Modification of Paving Asphalts with an Elastoplastic

BND 60/90 and BND 89/130 paving asphalts were modified by addition of DST-30 elastoplastic and petroleum plasticizers. Their performance at temperatures from -(32-35) to +(90-95)°C was examined in comparison with that of commercial unmodified asphalts, which are efficient at temperatures from -(23-27) to +(44-50)°C.     

Kinetics of the transfer of the dimethyl-carbamoyl group from N- and O-acylonium salts to azines and their N-oxides

The rate constants and activation energies were determined for a series of reactions involving the transfer of a dimethylcarbamoyl group from the N,N-dimethylcarbamoylonium salts of a series of nitrogen heterocycles and their N-oxides to nucleophiles (azines and their N-oxides) in acetonitrile. The measured values were compared with the structural, reaction, and equilibrium characteristics. L. M. Litvinenko Institute of Physical Organic Chemistry and Coal Chemistry, National Academy of Sciences of Ukraine, Donetsk. Translated from Teoreticheskaya i éksperimental’naya Khimiya, Vol. 33, No. 3, pp. 143–148, May–June, 1997.     

Phase Equilibria in the Ag–In–Pd System at 700°C

Summary. Phase equilibria in the Ag–In–Pd system were determined at 700°C based on experimental results for 21 alloys. A ternary compound T₁ (with the approximate composition AgInPd₂) was identified by XRD analysis. These data were compared with the results of a CALPHAD-type prediction, based on binary thermodynamic data only and a symmetrical Redlich–Kister–Muggianu model. The experimental results will serve as a basis for refined thermodynamic modeling of the different phases in this ternary system.