Magnetoelectric Properties of the Transient Contacts of Bi85Sb15 Solid Solution with Alloys Containing Lead and Tin

The transient contact resistance for the extruded samples of Bi₈₅Sb₁₅ solid solutions with contact alloys containing lead and tin atoms depending on the thermal annealing, magnetic field intensity and temperature have been investigated. It is shown that observed peculiarities can be explained by the creation in a near-contact region of the intermediate layer doped by Pb and Sn atoms.     

Influence of Electric Field on the Activation Energy of Local Levels in Semiconductors with Layered (GaSe) and Cubic (Ga2Se3) Structures

Semiconductors - The results of measuring the electrical conductivity of layered crystals (GaSe, GaTe, and their solid solutions) and cubic crystals (Ga2Se3) in strong electric fields (up to 5...     

Optimal control for the coefficients of a quasilinear parabolic equation

We study the well-posedness of an optimal control problem for the coefficients of a quasilinear parabolic equation. We obtain necessary optimality conditions for this problem.     

Magnetothermoelectric Properties of Extruded Bi85Sb15〈Pb,Te〉

Inorganic Materials - Bi85Sb15 + 0.01 at % Pb materials have been synthesized and their electrical conductivity σ, thermoelectric power α, Hall coefficient RH, and thermal conductivity...     

Anisotropy of electrical properties of lead doped extruded samples of Bi85Sb15

Thin films of Bi₈₅Sb₁₅ solid solution wich can be used in thermoelectric devices for cooling and stabilizing the temperature of Gann and Impatt diodes have been obtained by extrusion method. They have surface roughness in the range 10–80µm, dielectric lossestan δ ～ 10^?3 at 10 GHz, thermal conductivityβ ～ 4x10² W / (M · K). Anisotropy of electroconductivityσ, thermoelectric powerα and Hall coefficientsR _H of lead doped extruded Bi₈₅Sb₁₅ samples has been investigated in the temperature range between 77 K and 300 K and in the presence of magnetic fieldH up to ～ 74×10⁴ A/m. It is shown that the value and sign of the anisotropy coefficient essentially depend on heat treatment and impurity concentration. Experimental results are explained taking into account a crystal structure of Bi₈₅Sb₁₅, formation of texture and generation of deformation defects.     

On optimal control of the hyperbolic equation coefficients

For the problem of optimal control of the coefficients of the linear hyperbolic equation, consideration was given to the issues of correct formulation, and the necessary optimality condition was established.     

Effect of Gamma Irradiation on the Electrical Properties of Extruded Bi85Sb15〈Те〉 Samples

Inorganic Materials - The electrical conductivity (σ), thermoelectric power (α), and Hall coefficient (RH) of Bi85Sb15〈Те〉 samples have been measured in the...     

Effect of Gamma Irradiation on the Magnetothermoelectric Properties of Extruded ZrO2-Modified Bi0.85Sb0.15

Inorganic Materials - Electrical and thermal properties of extruded unmodified and ZrO2-modified Bi0.85Sb0.15 samples have been studied as functions of gamma dose at temperatures from ~77 to 300 K...     

Rheology of structural oil disperse systems

The problems of the rheology of oil disperse systems, which are accompanied by asphaltene particles being set into nanoaggregates and clusters of nanoaggregates and viscoelastic framework have been analyzed. The models of the coagulation of asphaltene particles and the calculation of the nanoaggregate size have been suggested. The conditions of the destruction of the structure have been considered and the rheological models of the filtration of oil disperse systems have been considered with the assumption of the Maxwell equation and model of the change of viscosity and mobility. The results have been compared with the experimental data.