Dependence of the Methane Decomposition Factor in Cold Electron-Beam Plasma upon Input Power

A device for creating a cold nonequilibrium electron-beam plasma in a supersonic gas flow has been developed. A method proposed for generating this plasma is described. It has been established that methane is activated by direct electron impact in electron-beam plasma under specified conditions. It has been shown that applying an external electromagnetic field leads to a significant increase in the methane decomposition factor due to the involvement of secondary, low-energy beam electrons accelerated in the electromagnetic field.     

Elastomers based on PEF-3A oligomer

The kinetics of curing epoxyurethane oligomer PEF-3A by curing agents of different chemical nature has been studied by differential scanning calorimetry. The reactivity of PEF-3A has been found to be higher than that of epoxide resins owing to the polar urethane groups in its molecule. The strength of the adhesive joint has been shown to increase after modification of PEF-3A-based compositions by orthophosphoric acid.     

Isotopic effect in Brillouin light-scattering spectra of a Cs5H3(SO4)4 · xH2O crystal

A Brillouin scattering study of the behavior of hypersonic longitudinal acoustic phonons in crystalline pentacesium trihydrogen tetrasulfate Cs₅H₃(SO₄)₄ · xH₂O (PCHS) and its deuterated analog Cs₅D₃(SO₄)₄ · xD₂O (DPCHS) at temperatures ranging from 420 to 120 K is reported. The effect of deuteration on the crystal lattice dynamics is investigated. The differences in the behavior of hypersonic acoustic phonons in the PCHS and DPCHS crystals suggest the existence of a hydrogen isotope effect in both the high-and low-temperature phases. A possible model of the isotopic effect in the high-temperature phase is discussed. An analysis is made of the acoustic response of the PCHS and DPCHS crystals in the region of the transition to the glasslike phase.     

Submillimeter-wave receiver with a balanced monolithic mixer

We describe the design of a superheterodyne receiver with a balanced monolithic integrated mixer and describe the technique and results of parameter measurements of the receiver and mixer over the frequency range 287–365 GHz. In the middle of this range, the double-band noise temperature of the receiver is 1500±50 K, while the double-band noise temperature and conversion loss of the mixer are 1250±50 K and 10±0.5 dB, respectively. Comparison with mixers and receivers of other types is performed. Translated from Izvestiya Vysshikh Uchebnykh Zavedenii, Radiofizika, Vol. 42, No. 6, pp. 573–580, February 1999.     

Optimization of the new technology for manufacturing γ-polyoxymethylene

A new technology of manufacturing γ-polyoxymethylene (γ-POM) by the polymerization 1,3,5-trioxane in the presence of a boron trifluoride etherate aprotic catalytic agent and a methylal telogen in the medium of the non-ozone-depleting solvent toluene, with an yield exceeding the yield of γ-POM manufactured by the existing industrial technology by 30% is developed. Regression equations for the yield and weight-average particle size of γ-POM synthesized in the toluene medium were derived by means of the optimal experimental design technique. The equations were used to optimize parameters of the synthesis and obtain γ-POM with the weight-average particle size of 15 μm and the highest possible yield.     

Fano antiresonance induced by the rashba spin−orbit coupling in systems with conduction channels exhibiting the points of nonanalyticity in fermion paths

It is shown that the combined effect of the nonanalyticity of the channel for the motion of charge carriers and the Rashba spin?orbit coupling induces resonant anomalies in the transport characteristics of nanosystems related to the size quantization. When the characteristic length determined by the ratio of the hopping integral and the spin?orbit coupling constant coincides with the distance between the points of nonanalyticity, the size effect arises in the channel. It manifests itself in the complete reflection from the device, which can be treated as the Fano antiresonance. The current?voltage characteristics of the nanosystem with the nonanalytical channel undergo significant changes at slight variations of the spin?orbit coupling constant near its critical value.     

New push–pull chromophores. Synthesis of 2-[4-Aryl-3-cyano-5-hydroxy-5-methyl-1<Emphasis Type="Italic">H</Emphasis>-pyrrol-2(5<Emphasis Type="Italic">H</Emphasis>)-ylidene]malononitriles

2-Aminoprop-1-ene-1,1,3-tricarbonitrile (malononitrile dimer) reacted with 1-arylpropane-1,2-diones in ethanol in the presence of piperidine to give new donor–acceptor chromophores, 2-[4-aryl-3-cyano-5-hydroxy-5-methyl-1H-pyrrole-2(5H)-ylidene]malononitriles.     

Plasma Polarization Around Dust Particle in an External Electric Field

The effect of plasma polarization around a negatively charged dust particle is investigated with the help of Monte Carlo simulation of ion trajectories in the electric field of the dust particle and an external electric field. The induced dipole moment of such a system was estimated in a wide range of dust particle and plasma parameters. It is shown that the dipole moment is very large, and has a non‐monotonous dependence on the external electric field. For a small external electric field, it weakly depends on the charge of the dust particle. The dipole moment reduces with the decrease of ion mean free path (© 2011 WILEY‐VCH Verlag GmbH & Co. KGaA, Weinheim)     

One-pack epoxy adhesives containing latent hardeners

The adhesive capacity of novel one-pack epoxy adhesives, which contain latent hardeners and are thermostable at 150°C, to carbon-filled and glass-reinforced plastics and aluminum alloys is studied. The heat resistance and the adhesive and cohesive characteristics of the adhesive composites developed are found to be comparable with the VK-20, VK-89, and VK-91 two-pack adhesives.