Mathematical modeling of methoxyanabasine C11H16N2O polymer solution ultrafiltration

This work covers the mathematical modeling of ultrafiltration with immobile membranes for physiologically-active of methoxyanabasine C₁₁H₁₆N₂O polymer solution. Methoxyanabasine is used as low toxic antineoplastic drug. On the basis of theoretical and experimental analysis of mass transfer and hydrodynamics, it is offered the mathematical model of permeability of membranes at an ultrafiltration of polymer solutions. Further the formulas for determination of factor of concentration polarization and ultrafiltration selectivity are calculated.     

Electric and Galvanomagnetic Properties of Cd3As2–20 mol % MnAs Composite under High Pressure

Physics of the Solid State - The pressure dependences of electrical resistance, Hall coefficient, charge carrier mobilities, and magnetoresistance of the Cd3As2–20 mol % MnAs composite are...     

The Synthesis and Investigation of the Electrical Properties of Tricadmium Diarsenide with MnAs Nanogranules

Technical Physics - Samples of tricadmium diarsenide with MnAs nanogranules (44.7 mol % MnAs) are synthesized. The morphology of the samples is studied by X-ray phase analysis and electron...     

Pressure and temperature dependences in p-ZnAs2 at high pressures

Kinetic effects in p-ZnAs₂ were measured at hydrostatic (P ≤ 9 GPa) and quasi-hydrostatic (to P ≤ 50 GPa) pressures on pressure buildup and depressurization. A conclusion on the occurrence of two phase transitions was made: I–II at P = 9–15 GPa and II-III at P = 30–35 GPa. Based on the temperature dependences of electrical resistance, it was shown that the conductivity is determined by activation mechanisms in a temperature range of 250–400 K; in this case, the activation energy changed with temperature and pressure. The pressure dependences of the activation energy and the coefficient R ₀, which characterizes the mobility, concentration, and effective mass of carriers, were calculated.     

Energy spectrum of electron trapping centers in CuInAsS<Subscript>3</Subscript>

This paper presents the results of the investigation of the energy spectrum of electronic states due to trapping centers, the role of which in CuInAsS₃ is played by lattice defects. The results of the analysis of the thermally stimulated current curves of CuInAsS₃ demonstrate that the energy spectrum of trapping centers is localized under the bottom of the conduction band in the energy range E _C–(0.14–0.35) eV.     

Magnetic and electrical properties of crystalline materials based on indium and copper chalcogenides in a wide range of temperatures and pressures

The effect of temperatures (2–300 K) and high pressures (to 50 GPa) on the electrical and magnetic properties of crystalline materials based on copper and indium chalcogenides with the general formula (InB)_1?x (CuAB ₂)_x, where A = As, Sb; and B = S, Se, and also crystalline CuInSe₂ and CuInS₂, has been studied.     

Thermoelectric Properties of a Ferromagnetic Semiconductor Based on a Dirac Semimetal (Cd<Subscript>3</Subscript>As<Subscript>2</Subscript>) under High Pressure

The pressure dependences of thermal emf (a parameter that ranks among the most sensitive to phase transformations) are studied for the purpose of identifying baric phase transitions in the 10–50 GPa interval in the Cd₃As₂ + MnAs (44.7% MnAs) structure formed by ferromagnetic MnAs granules in a semiconductor Cd₃As₂ matrix.     

Photoelectric and electric properties of four-component copper chalcogenides

The results of investigation of the electrophysical and photoelectric properties of complex copper chalcogenides are presented, namely, the properties of CuSnAsSe₃, which exhibits ferroelectric properties, and CuInAsS₃, which exhibits ionic conductivity. The spectral and temperature regions of photosensitivity of these crystals are determined. The depth of the level of carrier trapping centers, which manifest themselves under thermal activation, are evaluated from the analysis of thermally stimulated conductivity (TSC) curves in CuInAsS₃.