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31.
32.
A. Kh. Gyulnazaryan T. A. Sahakyan G. T. Sargsyan J. V. Grigoryan G. M. Muradyan G. A. Panosyan R. A. Tamazyan A. G. Ayvazyan A. M. Petrosyan 《Russian Journal of General Chemistry》2016,86(5):1017-1021
The Stevens rearrangement of ammonium salts with two propargyl group at the ammonium nitrogen results in the formation of amines containing acetylene-acetylene and acetylene-allene fragments. 相似文献
33.
Y.M. Shulga Ta-Chang Tien Chi-Chen Huang Shen-Chuan Lo V.E. Muradyan N.V. Polyakova Yong-Chien Ling R.O. Loutfy A.P. Moravsky 《Journal of Electron Spectroscopy and Related Phenomena》2007,160(1-3):22-28
Arc-produced carbon multi-walled nanotubes (MWNTs) were fluorinated at 420 °C in a flow of diluted F2 gas containing small admixture of HF gas. Fluorinated materials (F-MWNTs) with 10–55 wt.% fluorine content were studied by XPS. It was shown that fluorination begins at the external layers of nanotubes and the reaction front propagates inside the multi-layer particles in concert with structural deterioration of graphene layers. The C2F stoichiometry still allows MWNT wall integrity, similar to known for SWNTs. The fluorine contents in the product can noticeably exceed this higher fluorine limit for tube stability. The position of the F 1s line at 688.2 eV does not depend on the fluorine concentration. Nearly covalent C–F bonds dominate the F-MWNT samples, with a small quantity (2–9%) of ionic bonds also present. Fluorinated carbon tends to spatially separate from non-fluorinated carbon. 相似文献
34.
G. A. Muradyan A. Zh. Muradyan 《Journal of Contemporary Physics (Armenian Academy of Sciences)》2007,42(3):94-100
We calculate the critical temperature of the Bose-Einstein condensation of an ideal Bosegas in the presence of an external periodic potential in one, two, or three directions. A number of assumed approximations enables us to show that the only parameter determining the critical temperature of condensation is the width of the lower energy band with the direct proportionality to the one-third power of this width for each direction of periodicity of the external potential. This also proves the result, obtained earlier by means of numerical calculation, that deepening of the periodic potential (which is known to lead to narrowing of energy bands) leads to lowering of the critical temperature. The fundamental role of quantum tunneling in establishing this regularity is emphasized. 相似文献
35.
M. G. Muradyan 《Computational Mathematics and Mathematical Physics》2014,54(3):546-552
In the framework of a discrete radiative transfer model, a method is proposed for finding the reflection and transmission operators in the conservative case. 相似文献
36.
The dielectric properties of an epoxyamine composite modified by carbon nanostructures up to 2 wt % are studied at a frequency of 2.73 GHz, and its permittivity is shown to behave nonmonotonically (anomalously) as a function of the filler concentration. Possible causes of this anomalous behavior of the dielectric properties are discussed. 相似文献
37.
Smirnov Yu. N. Efremova A. I. Lesnichaya V. A. Glavina T. A. Muradyan V. E. 《Russian Journal of Applied Chemistry》2010,83(4):732-737
The behavior of fracture toughness parameters in comparison with other physicomechanical parameters of failure was examined with the aim to evaluate the efficiency of modification (elastification) of heat-resistant binders, with four epoxy-amine compounds taken as examples. 相似文献
38.
The UV-UV hole-burning spectra of the jet-cooled 1-aminoindan were measured for the first time. Complicated spectral features observed in the laser-induced fluorescence excitation spectrum due to two conformers, R and B, were firmly separated. On the basis of fluorescence measurements and B3LYP/cc-pVTZ calculations, low-frequency ring twisting and ring puckering modes were assigned. These modes are coupled in the S1 state due to the Duschinsky rotation. The Duschinsky matrix was calculated from the normal modes predicted by quantum chemical calculations. The coupling between the twisting and puckering modes for conformer B is stronger than that for conformer R. The twisting mode was observed at 0+99 cm(-1) in the S1 state for conformer B, while not for conformer R. The Franck-Condon activity of the twisting mode substantially differs between the two conformers. The transition to the twisting level for conformer B would be allowed by the Duschinsky rotation. The fluorescence lifetime of conformer vibronic levels was also measured and differed for each conformer. 相似文献
39.
H Toguchi Y Ogawa K Iga T Yashiki T Shimamoto 《Chemical & pharmaceutical bulletin》1990,38(10):2792-2796
To obtain information as to a suitable formulation of ethyl 2-chloro-3-[4-(2-methyl-2-phenylpropyloxy)-phenyl]propionate (AL-294), an antihyperlipidemic drug of low water solubility, the bioavailability after its oral administration in various dosage forms was evaluated in rats and dogs. After AL-294 was administered orally, AL-294 acid (2-chloro-3-[4-(2-methyl-2-phenylpropyloxy)phenyl]propionic acid), which is a metabolite of AL-294, was detected in the plasma. Therefore, absorbability of AL-294 was evaluated using plasma AL-294 acid levels. AL-294 in an oil solution or in a gelatin capsule showed poor absorption, whereas it's absorption was greatly enhanced in the form of an emulsion. The postprandial administration also showed better absorption. The elimination rate of AL-294 acid from the plasma after oral administration of the emulsion was similar to that after intravenous administration of a sodium salt of AL-294 acid. 相似文献
40.
Multipole interactions are known to play a central role in the unconventional properties of light rare-earth hexaborides and
especially of CeB6. Substituting Pr at the Ce sites has the effect of enhancing exchange interactions and changing the symmetry of the local
4f charge distribution, while suppressing the octupole moment. The (T, H) magnetic phase diagrams of the Ce
x
Pr1 − x
B6 compounds display a large variety of ordered phases involving magnetic and/or charge degrees of freedom. Here we focus on
the compound Ce0.7Pr0.3B6, which is located slightly beyond the Pr concentration where the antiferroquadrupolar phase of pure CeB6 is suppressed in zero field. The different magnetic structures have been characterized by neutron diffraction and their origin
is discussed in connection with recent non-resonant X-ray results by Tanaka et al.
相似文献