Functional Parallel Typified Language and Its Implementation on Clusters

In the paper, a functional parallel programming system implemented on clusters is discussed. It includes a language of compositional functional parallel programming, program development tools, and tools for controlling parallel code execution on the clusters.     

Experimental study of heat exchange in a moderately rarefied gas

An experimental study is performed of heat exchange in multiatomic gases at moderate Knudsen numbers in coaxial geometry. The data obtained are described well by the Liu-Lees theory of multiatomic gases.Translated from Inzhenerno-Fizicheskii Zhurnal, Vol. 49, No. 4, pp. 579–585, October, 1985.     

Homologous series of layered tetradymite-like compounds in the Sb-Te and GeTe-Sb2Te3 systems

The structures of layered compounds in thenSb₂ ·mSb₂Te₃ andnGeTe ·mSb₂Te₃ homologous series were studied by x-ray diffraction. GeSb₆Te₁₀ (n = 1,m = 3) was shown to have a 51-layer structure (sp. gr. ) withc = 10.202(1) nm. In the structure of GeSb₆Te₁₀, Sb₂Te₃ five-layer slabs and GeSb₂Te₄ sevenlayer slabs are stacked along thec axis in the ordered sequence -557 557 557-. Crystallographic data for this compound are presented. The specific and common structural features of the layered compounds in thenSb₂ ·mSb₂Te₃ andnGeTe ·mSb₂Te₃ homologous series are discussed.     

A Challenge toward Novel Quaternary Sulfides SrLnCuS3 (Ln = La,Nd, Tm): Unraveling Synthetic Pathways,Structures and Properties

We report on the novel heterometallic quaternary sulfides SrLnCuS₃ (Ln = La, Nd, Tm), obtained as both single crystals and powdered samples. The structures of both the single crystal and powdered samples of SrLaCuS₃ and SrNdCuS₃ belong to the orthorhombic space group Pnma but are of different structural types, while both samples of SrTmCuS₃ crystallize in the orthorhombic space group Cmcm with the structural type KZrCuS₃. Three-dimensional crystal structures of SrLaCuS₃ and SrNdCuS₃ are formed from the (Sr/Ln)S₇ capped trigonal prisms and CuS₄ tetrahedra. In SrLaCuS₃, alternating 2D layers are stacked, while the main backbone of the structure of SrNdCuS₃ is a polymeric 3D framework [(Sr/Ln)S₇]_n, strengthened by 1D polymeric chains (CuS₄)_n with 1D channels, filled by the other Sr²⁺/Ln³⁺ cations, which, in turn, form 1D dimeric ribbons. A 3D crystal structure of SrTmCuS₃ is constructed from the SrS₆ trigonal prisms, TmS₆ octahedra and CuS₄ tetrahedra. The latter two polyhedra are packed together into 2D layers, which are separated by 1D chains (SrS₆)_n and 1D free channels. In both crystal structures of SrLaCuS₃ obtained in this work, the crystallographic positions of strontium and lanthanum were partially mixed, while only in the structure of SrNdCuS₃, solved from the powder X-ray diffraction data, were the crystallographic positions of strontium and neodymium partially mixed. Band gaps of SrLnCuS₃ (Ln = La, Nd, Tm) were found to be 1.86, 1.94 and 2.57 eV, respectively. Both SrNdCuS₃ and SrTmCuS₃ were found to be paramagnetic at 20–300 K, with the experimental magnetic characteristics being in good agreement with the corresponding calculated parameters.     

Topological characterization of the Ge-Sb-Te phase diagram

Topological images of the Ge-Sb-Te phase diagram are constructed on the basis of two versions of the phase relations between the low-temperature forms of Ge_1-δTe in the Ge-Te system. The images have the form of flow diagrams and graphs, with labeled nodes representing the phases existing in the system. The graph edges represent two-phase mixtures and are labeled by the numbers of the phase reactions in which these mixtures appear and disappear. The graphs help to visualize the topology of the phase diagram in a compact form and are convenient for topological characterization and identification of phase reactions at invariant points.     

Predicting the Electrochemical Pressure-Driven Membrane Separation of Industrial Solutions Using Friction Theory

Theoretical Foundations of Chemical Engineering - An improved approach to determining the kinetic characteristics of electrochemical pressure-driven membrane separation of solutions has been...     

Mathematical Model of Electromembrane Separation of Copper-Electroplating Production Solutions

Theoretical Foundations of Chemical Engineering - This study is devoted to the development of a mathematical model of electromembrane separation of copper-containing solutions in copper plating...     

Effect of Process Regimes on the Life of “Mayerton” Linings in 385-Ton Steel Teeming Ladles

The effect of performance factors on the life of linings of large ladles from periclase-carbon (the slag-line area) and alumopericlase-carbon (walls) refractories is considered. The studied performance factors are the changes in the properties of the refractories upon heating, the temperature regime of melting, the chemical interaction between the lining and the slag, the residence time of metal in the ladle, the causes of emergency situations, and the effect of external factors on the topography of the lining wear. Observations of 114 ladles have shown that the lining life is determined by three groups of factors. Preliminary estimates made by the authors lead them to expect that a correction of some acting conditions of operation and maintenance of the ladles will increase their life by 10 – 12% without changes in the quality of the refractories or the design of the lining.