Spectral characteristics and redox behavior of the polynuclear managanese(III,IV) complex [Mn12O12(CH3COO)16(H2O)4] in liquid-phase oxidation of benzene

We have shown that benzene is oxidized to phenol by the polynuclear manganese complex [Mn₁₂O₁₂(CH₃COO)₁₆(H₂O)₄] in acetonitrile solution at room temperature and atmospheric pressure, with better than 80% selectivity. We have established that introduction of oxygen from the air into the reaction mixture as the reoxidant does not make it a catalytic process. L. V. Pisarzhevskii Institute of Physical Chemistry, National Academy of Sciences of Ukraine, 31 Prospekt Nauki, Kiev 252039, Ukraine. Translated fromTeoreticheskaya i éksperimental'naya Khimiya, Vol. 35, No. 2, pp. 99–102, March–April, 1999.     

The plane asymmetric problem of immersion of a rigid circular cylinder in a fluid

The plane asymmetric problem of vertical impact of a rigid body against the surface of a compressible fluid is considered. It is assumed that the penetrating circular cylinder has a shifted center of mass. Solution of the boundary-value problem is reduced to solution of an infinite system of linear integral Volterra equations of the second kind. We present an analysis of the results as a function of initial values of the angle of asymmetry. S. P. Timoshenko Institute of Mechanics, National Academy of Sciences of Ukraine, Kiev; Ukranian Transportation Institute, Kiev. Translated from Prikladnaya Mekhanika, Vol. 35, No. 8, pp. 61–70, August, 1999.     

Statistical characteristics of radiation of a point source scattered by a layer of turbulent collisional magnetized plasma

We consider multiple scattering of electromagnetic waves by a layer of turbulent magnetized collisional plasma. The influence of the distances from the layer's boundaries to the emitter and receiver is analyzed. We find out that, provided absorption in the plasma is strong enough, the width of the angular spectrum of the received radiation can be larger than in the collisionless plasma, and the maximum of the spectrum is substantially shifted with respect to the direction to the source. It is shown that these effects weaken as the emitter approaches the layer. The dependence of the width of the spectrum and the shift of its maximum on distance from the receiver to the layer's boundary can be substantially nonmonotonic. Lobachevsky State University, Nizhny Novgorod, Russia; Georgian Technical University, Tbilisi, Georgia. Translated from Izvestiya Vysshikh Uchebnykh Zavedenii, Radiofizika, Vol.42, No. 4, pp. 340–354, April 1999.     

Probing States of a Double Acceptor in CdHgTe Heterostructures via Optical Gating

JETP Letters - Photoconductivity spectra in a HgTe/CdHgTe double quantum well with a normal band structure have been studied. Photosensitivity bands associated with the ionization of a mercury...     

Study of interband cascade lasers with tunneling transition

Two-frequency lasing in a new class of heterolasers (interband cascade lasers with tunneling transition that separates two active regions of quantum wells located in a single waveguide) is realized and studied. The laser scheme weakens the competition between the quantum wells upon the simultaneous generation of the long-and short-wavelength modes.     

Results of theoretical and experimental studies of solar wind and active galactic nuclei on LFVN VLBI network using S2 recording system

We discuss the results of two sessions of observations at the Low-Frequency VLBI Network (LFVN), carried out in 1999 (INTAS99.4) and 2000 (INTAS00.3) at a wavelength of 18 cm using the S2 recording system and processed using the correlator system in Pentictone, Canada. In different configurations of the experiments on studying the solar wind and active galactic nuclei, the antennas at the following sites were employed: Medvezhji Ozera (RT-64, Special Engineering Bureau of Moscow Power Engineering Institute, Russia), Pushchino (RT-22, Pushchino Radio Astronomy Observatory, Russia), Hartebeesthoek (RT-25, South Africa), Noto (RT-32, Italy), Shanghai (RT-25, China), Pune (RT-45, India), Svetloe (RT-32, Institute of Applied Astronomy RAS, Russia). The work resulted in successful testing of the method of radio probing of the solar-wind plasma by radiation of extragalactic sources, supplemented with the method of radio interferometric reception. Spectral analysis of the obtained data allowed us to estimate the index of spatial spectrum of the electron number density.uctuations and the transfer velocity of the solar-wind inhomogeneities on the sounding path. We present and discuss the retrieved images of STA-102 quasar and the BL Lacertae object 1418+546 with millisecond angular resolution and demonstrate the results of modeling the structure of these sources. __________ Translated from Izvestiya Vysshikh Uchebnykh Zavedenii, Radiofizika, Vol. 50, No. 4, pp. 275–299, April 2007