Application of the method of initial parameters to analysis of coupled hydromechanical vibrations in piping systems. Part 1. Vibrodiagnostics of piping under mechanical vibrations

The paper describes the method of initial parameters which is used for stress analysis of complex branched piping systems under static loading as well as under natural and forced harmonic vibrations, including the case of kinematic loading by displacement amplitudes. For the purpose of modeling arbitrary curved elements, in particular three-dimensional ones, the authors propose an inertialess rotary element of zero length, which turns coordinate axes of neighbor elements. The paper demonstrates the potentialities of the method for vibrodiagnostics of piping.     

Development,Fabrication, and Comprehensive Tests of a Transport-Packaging Set with a Shell Made of High-Strength Cast Iron with Globular Graphite for Transportation of Spent Irradiated Fuel Assemblies

The design of a transport-packaging set equipped with a TUK-128 (TUK-128/1) container intended for transporting spent nuclear fuel from research reactors is described. The radiation safety, tightness, strength, and thermal stability of the transport-packaging set are considered. Results from emergency, shock, and fire tests of the container’s full-scale model are presented.     

High-Melting Heat-Insulating Materials Obtained by Foaming and Gassing Methods

Heat-insulating ceramic materials have been developed, whose porous structure is provided by foaming and gas formation. Foaming and gas-forming agents, stabilizing, plastifying, and other additives and fixing agents for foam and gas mixtures are identified.     

State of hydropower installations in Armenia after the Spitak earthquake

Translated from Gidrotekhnicheskoe Stroitel'stvo, No. 8, pp. 21–25, August, 1989.     

The application of radiation diffuse scattering to the calculation of phase diagrams of F.C.C. substitutional alloys

By using quantitative information about the radiation diffuse-scattering intensity of the disordered f.c.c. substitutional alloy Me′_1-cMe″_c (c—concentration) the Fourier component, , of mixing energies of Me′ and Me″ atoms may be estimated. We have to use the measurement data of the diffuse-scattering intensities at the corresponding reciprocal-space points k of the disordered phase and then determine the parameter (k). The statistical thermodynamics of the non-ideal solid solution is determined by these energy parameters { (k)}. Therefore, one can obtain the configuration free energy of an alloy, F=U-TS (U—internal energy, S—entropy), and then determine its fundamental thermodynamic characteristics, including not only its phase diagram, but also the concentration-dependent order–disorder transformation temperature, temperature and concentration long-range order parameter dependences, chemical activity, heat capacity etc. Some thermodynamic properties are calculated within the framework of the statistical-thermodynamic approach for f.c.c.-Ni–Fe alloy. The diffuse-scattering intensity values are taken from data in the literature.     

Reverse electric field in spherical striations

We have experimentally studied the floating potential distribution in a spherical stratified dc discharge. A nonmonotonic potential profile is observed in the region of striations, which is indicative of the existence of regions with a reverse electric field.     

Change in Iron Powder Properties with Treatment in Rolls

Conditioned iron powders are prepared by carbothermal reduction of “Blue Dust” (India) ore concentrate followed by compaction treatment in rolling mill and a decarburizing anneal. The properties of powder prepared by grinding in a vibration and rolling mill are determined. The method makes it possible to control the bulk density of the powder from 1.75 to 2.75 g/cm³. Determination of the production properties of the powders obtained and powder NC.100.24 by the same procedure established satisfactory conformity of the results. The technological desirability of preparing conditioned iron powder by treatment in a rolling mill is demonstrated.__________Translated from Poroshkovaya Metallurgiya, Nos. 3–4(442), pp. 12–16, March–April, 2005.     

Influence of water on oxidation of IGP-series oils

Translated from Khimiya i Tekhnologiya Topliv i Masel, No. 8, pp. 20–21, August, 1990.