Investigation of Stimulated Emission from HgTe/CdHgTe Quantum-Well Heterostructures in the 3–5 μm Atmospheric Transparency Window

Semiconductors - Stimulated emission based on interband transitions depending on the pumping wavelength is studied for heterostructures with Hg(Cd)Te/CdHgTe quantum wells in the wavelength region...     

Observance of the Gibbs-Konovalov law at complex singular points of two-phase multicomponent systems

The observance of the Gibbs-Konovalov law is proved for all complex singular points of two-phase multicomponent systems.     

Calculation of Wave Functions of Resonant Acceptor States in Narrow-Gap CdHgTe Compounds

Semiconductors - Electron wave functions in the conduction band of zero-gap HgCdTe alloy are calculated in the Coulomb acceptor field. The resonant-state energies are determined.     

Continuous-Wave Stimulated Emission in the 10–14-μm Range under Optical Excitation in HgCdTe/CdHgTe-QW Structures with Quasirelativistic Dispersion

Semiconductors - In two waveguide heterostructures with quantum-well arrays of Hg0.892Cd0.108Te/Cd0.63Hg0.37Te with a thickness of 6.1 nm and Hg0.895Cd0.105Te/Cd0.66Hg0.34Te with a thickness of 7.4...     

Double-strand scheme for spinning technical viscose yarn

Conclusions A two-strand scheme for spinning technical viscose of 183.5 tex linear density has been developed under experimental production conditions. The yarn obtained by this scheme has a breaking load of 38–40 cN/tex at an elongation of 8–10%.In the developed scheme, combination of the processes of orientation stretching, final regeneration, and complete driving off of carbon disulfide from the yarn is provided for, which makes it possible to localize the evolution of harmful gases in the zone of the precipitation and plasticizing baths and to obtain a concentrated gas-air mixture which is suitable for regeneration.Translated from Khimizheskie Volokna, No. 1, pp. 31–33, January–February, 1988.     

Influence of structure of polyacid on synthesis and properties of interpolymer polyaniline complexes

Chemical matrix polymerization of aniline was performed in the presence of polyacids with various macromolecule chain flexibility. Aniline polymerization in the presence of flexible chain polyacids leads to the formation of interpolymer complexes of polyaniline (PANI) of double-stranded structure with a high content of localized polarons and, in the presence of rigid chain polyacids, it leads to the formation of complexes with comblike structures with a high content of delocalized polarons. During the synthesis of PANI at a reduced temperature, the induction period increases and the films of the obtained complexes have high conductivity than in the case of synthesis at room temperature. Electrical and spectral properties and surface morphology of the PANI interpolymer complexes were investigated.