Correctness of certain linear problems regarding the stability of strong gaps in magnetohydrodynamics

Novosibirsk City. Translated from Sibirskii Matematicheskii Zhurnal, Vol. 31, No. 2, pp. 3–8, March–April, 1990.     

Dynamics of collisional relaxation of the optically induced anisotropy of <Emphasis Type="Italic">para</Emphasis>-quaterphenyl in the gas phase

The decay kinetics of the optically induced anisotropy of para-quaterphenyl molecules is theoretically and experimentally studied in a wide range of pressures of buffer gases, pentane and argon. The anisotropy of absorption is measured in real time using a femtosecond spectrometer. Comparison with the theoretical models of orientational relaxation shows that the collisional interruption of the angular momentum corresponds to a situation that is intermediate between the situations described by the J-diffusion model and by the model of the Fokker-Planck equation and is closer to the latter situation. In terms of the Keilson-Storer model, such a regime corresponds to the collision efficiency parameter γ ≈ 0.78 for argon and 0.66 for pentane; i.e., 4.5 collisions with argon or 2.9 collisions with pentane are necessary to completely randomize the angular momentum of para-quaterphenyl molecules.     

Dynamic properties of AlGaAs vertical cavity surface emitting lasers with active region based on submonolayer InAs insertions

It has been shown that the use of submonolayer InAs insertions as an active region of AlGaAs vertical cavity surface emitting lasers make it possible to attain resonant frequencies as high as 17 GHz. In this case, single-mode devices with a smaller diameter of the current aperture make it possible to attain higher frequencies at lower current densities than those of multimode devices with a larger aperture diameter. The maximum error-free data transmission rate in the direct modulation mode in NRZ format is 20 Gb/s and is limited by the parasitic cutoff frequency. The high resonant frequency suggests that further optimization of the device design, directed to decreasing the electrical capacitance and resistances, the data transmission rate in lasers based on submonolayer insertions can be increased to 40 Gb/s.     

Reductive dehalogenation of halo derivatives of bis(1,1′-bicyclo[1.1.1]pentane)

Translated from Izvestiya Akademii Nauk SSSR, Seriya Khimicheskaya, No. 3, pp. 716–717, March, 1990.     

Unusual directions in the reactions of [1.1.1]propellane with sulfonyl chlorides and sulfuryl chloride

Translated from Izvestiya Akademii Nauk SSSR, Seriya Khimicheskaya, No. 10, pp. 2451–2452, October, 1990.