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A. L. Rusanov M. L. Keshtov N. M. Belomoina A. K. Mikitaev G. B. Sarkisyan S. V. Keshtova 《Russian Chemical Bulletin》1997,46(4):777-779
Bis (p-fluorophenylethynyl) derivatives were obtained by the reaction of bisbromoaromatic compounds withp-fluorophenylacetylene in the presence of a Pd catalyst. Subsequent oxidation of these products using an I2-DMSO system led to new bis(p-fluorophenylglyoxaly)ketones, α-diketones, and heterocyclic compounds.
Translated fromIzvestiya Akademii Nauk. Seriya Khimicheskaya, No. 4, pp. 810–812, April, 1997. 相似文献
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It is proved that if M is a profinitely generated -module which is free as a module over the ring of p-adic integers, then M is determined up to free direct factors by its homology. This result generalizes the theorem on homological determinacy of p-adic representations of a cyclic group [Ref. Zh. Mat., 3A, 318 (1971)].Translated from Zapiski Nauchnykh Seminarov Leningradskogo Otdeieniya Matematicheskogo Instituta im. V. A. Steklova AN SSSR, Vol. 64, pp. 104–126, 1976. 相似文献
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D. B. Hayrapetyan E. M. Kazaryan H. A. Sarkisyan 《Journal of Contemporary Physics (Armenian Academy of Sciences)》2013,48(1):32-36
An electron gas in a strongly oblated ellipsoidal quantum dot with impenetrable walls is considered. Influence of the walls of the quantum dot is assumed to be so strong in the direction of the minor axis (the OZ axis) that the Coulomb interaction between electrons in this direction can be neglected and considered as two-dimensional, coupled. On the basis of geometric adiabaticity we show that in the case of a few-particle gas a powerful repulsive potential of the quantum dot walls has a parabolic form and localizes the dot in the geometric center of the structure. Due to this fact, conditions occur to implement the generalized Kohn theorem for this system. 相似文献
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G. Hakhumyan D. Sarkisyan A. Sargsyan A. Atvars M. Auzinsh 《Optics and Spectroscopy》2010,108(5):685-692
It has been experimentally demonstrated that the use of the effect of significant narrowing of the fluorescence spectrum from
a nanocell that contains a column of atomic Rb vapor with a thickness of L = 0.5λ (where λ = 794 nm is the wavelength of laser radiation, whose frequency is resonant with the atomic transition of
the D
1 line of Rb) and the application of narrowband diode lasers allow the spectral separation and investigation of changes in
probabilities of optical atomic transitions between levels of the hyperfine structure of the D
1 line of 87Rb and 85Rb atoms in external magnetic fields of 10–2500 Gs (for example, for one of transitions, the probability increases ∼17 times).
Small column thicknesses (∼390 nm) allow the application of permanent magnets, which facilitates significantly the creation
of strong magnetic fields. Experimental results are in a good agreement with the theoretical values. The advantages of this
method over other existing methods are noted. The results obtained show that a magnetometer with a local spatial resolution
of ∼390 nm can be created based on a nanocell with the column thickness L = 0.5λ. This result is important for mapping strongly inhomogeneous magnetic fields. 相似文献
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Russian Journal of General Chemistry - The review summarizes the data on the synthesis of fullerene C60 and C70 derivatives with various biological activities. 相似文献
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The problem on longitudinal wave propagation in a plate in the presence of a constant transversal magnetic field is studied.
The asymptotic behavior of tangential displacement of the points of the plate median surface is found. It is established that
the wave of a given initial shape finally turns into a quasiharmonic one.
Published in Matematychni Metody ta Fizyko-Mekhanichni Polya, Vol. 51, No. 1, pp. 194–196, January–March, 2008. 相似文献
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V. A. Harutyunyan E. M. Kazaryan H. A. Sarkisyan 《Journal of Contemporary Physics (Armenian Academy of Sciences)》2011,46(6):285-292
On the example of InSb we consider the influence of a strong homogeneous electrostatic field on the state of carriers in a
narrow-band quantized cylindrical layer in the case of Kaine dispersion law. Explicit expressions for the energy spectrum
and wave function envelopes of charge carriers in the heterolayer are obtained. It is shown that under action of the strong
external field the rotational motion, with respect to angular variables, of charge carriers becomes oscillatory in a narrow
cone of the azimuth angle. We have obtained corresponding selection rules and calculated the threshold frequencies of absorption
for interband and intraband electro-optical transitions in the layer. The threshold frequencies are determined by the geometric
sizes of the sample and the magnitude of the external field. 相似文献