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51.
K. A. Kozlovskaya E. N. Ovchinnikova V. E. Dmitrienko A. Rogalev 《Journal of Surface Investigation: X-ray, Synchrotron and Neutron Techniques》2008,2(4):573-576
The possibility of observing x-ray natural circular dichroism (XNCD) in enantiomorphous CsCuCl3 crystals has been considered. The spectra of XNCD in CsCuCl3 have been numerically simulated for the K, L1, L2, and L3 x-ray absorption edges of copper, cesium, and chlorine using FDMNES and LMTO programs. It has been shown that the largest value of dichroism signal can be expected near the copper and chlorine L1 edges. 相似文献
52.
Olga S. Ovchinnikova Vilmos Kertesz Gary J. Van Berkel 《Rapid communications in mass spectrometry : RCM》2011,25(24):3735-3740
This paper describes the coupling of ambient pressure transmission geometry laser ablation with a liquid‐phase sample collection into a continuous flow surface sampling probe/electrospray emitter for mass spectrometry based chemical imaging. The flow probe/emitter device was placed in close proximity to the surface to collect the sample plume produced by laser ablation. The sample collected was immediately aspirated into the probe and onto the electrospray emitter, ionized and detected with the mass spectrometer. Freehand drawn ink lines and letters and an inked fingerprint on microscope slides were analyzed. The circular laser ablation area was about 210 µm in diameter and under the conditions used in these experiments the spatial resolution, as determined by the size of the surface features distinguished in the chemical images, was about 100 µm. Published in 2011 by John Wiley & Sons, Ltd. 相似文献
53.
Ivanova E. S. Ovchinnikova G. I. Eremeev A. P. Grebenev V. V. Belugina N. V. Tolstikhina A. L. 《Crystallography Reports》2019,64(5):774-779
Crystallography Reports - The temperature evolution of the dielectric spectra of TGS–TGS + Cr crystals (TGS stands for triglycine sulfate) with a periodic distribution of chromium impurity... 相似文献
54.
M. Ya. Ovchinnikova 《JETP Letters》2010,92(4):223-225
The spin and charge structures formed in a Hubbard model for a finite two-dimensional cluster have been studied in the mean
field approximation. The self-consistent iterative procedure reduces an uncorrelated initial spin distribution into stable
structures with characteristic spectral properties. It has been shown that the density of states of the system for any doping
has a sharp minimum at the Fermi level, the pseudogap. This means that the pinning of the gap at the Fermi level is not an
exclusive property of a superconducting state, but is also typical of a normal state of spin glasses. 相似文献
55.
E. V. Ovchinnikova 《Journal of Mathematical Sciences》2010,169(5):651-653
It is shown that any finite n-element predicate system for which any two one-element subsystems are isomorphic is embeddable in a finite (2
n
− 1)-element system having a transitive automorphism group. 相似文献
56.
Olga S. Ovchinnikova Gary J. Van Berkel 《Rapid communications in mass spectrometry : RCM》2010,24(12):1721-1729
An atmospheric pressure proximal probe thermal desorption sampling method coupled with secondary ionization by electrospray or atmospheric pressure chemical ionization was demonstrated for the mass spectrometric analysis of a diverse set of compounds (dyestuffs, pharmaceuticals, explosives and pesticides) separated on various high‐performance thin‐layer chromatography plates. Line scans along or through development lanes on the plates were carried out by moving the plate relative to a stationary heated probe positioned close to or just touching the stationary phase surface. Vapors of the compounds thermally desorbed from the surface were drawn into the ionization region of a combined electrospray ionization/atmospheric pressure chemical ionization source where they merged with reagent ions and/or charged droplets from a corona discharge or an electrospray emitter and were ionized. The ionized components were then drawn through the atmospheric pressure sampling orifice into the vacuum region of a triple quadrupole mass spectrometer and detected using full scan, single ion monitoring, or selected reaction monitoring mode. Studies of variable parameters and performance metrics including the proximal probe temperature, gas flow rate into the ionization region, surface scan speed, read‐out resolution, detection limits, and surface type are discussed. Published in 2010 by John Wiley & Sons, Ltd. 相似文献
57.
N. A. Ovchinnikova A. E. Sinyakov V. S. Sergienko G. G. Aleksandrov 《Crystallography Reports》2003,48(4):602-605
A product of the insertion of two isothiocyanate molecules into the same W-Cl bond, namely, W-Cl-WCl5{N(Et)C(S)N(Et)C(S)Cl} (I), is synthesized by the reaction of WCl6 with EtNCS in a dichloroethane solution. The hydrolysis of compound I results in the formation of single crystals of the complex . The structure of crystals II is determined using X-ray diffraction. It is demonstrated that structural units of crystals II are the [WVIOCl5]? anionic complexes and the ethyl-(4-ethyl-5-thioxo[1.2.4]dithiazolidin-3-ylidene)ammonium cations. 相似文献
58.
M. S. Khots A. V. Golubenkov N. S. Ovchinnikova G. A. Gerasimova 《Russian Chemical Bulletin》1990,39(1):62-65
The basic components (C3H6, NH3, H2O, C2H4, CH4, C2H2, and HCN) and temperature ranges of their separation in thermal decomposition of -aminopropanetriethoxysilane grafted on the surface of silica were determined with a mathematical program for processing mass spectra. The formation of these components was explained with well-known chemical reactions.Deceased.Translated from Izvestiya Akademii Nauk SSSR, Seriya Khimicheskaya, No. 1, pp. 73–76, January, 1990.We would like to thank G. V. Kudryavtsev and L. D. Belyakova for providing the sample, and A. P. Gai and L. T. Zhuravlev for recording the mass spectra. 相似文献
59.
60.
M. A. Kuchenkova É. F. Redina N. L. Ovchinnikova P. Kh. Yuldashev 《Chemistry of Natural Compounds》1978,13(5):570-572
Summary 1. The 7S globulin of cotton seeds consists of eight polypeptide chains of two types differing by their contents of carbohydrates and of amide groups.2. On the basis of the results of a study of the amino-acid sequences of the peptides obtained by cleaving the 7S globulin with trypsin and chymotrypsin, its complete primary structure has been put forward.Institute of the Chemistry of Plant Substances, Academy of Sciences of the Uzbek SSR, Tashkent. Translated from Khimiya Prirodnykh Soedinenii, No. 5, pp. 687–690, September–October, 1977. 相似文献