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排序方式: 共有171条查询结果,搜索用时 15 毫秒
1.
2.
Dimitar I. Pushkarov 《Central European Journal of Physics》2004,2(3):420-455
Basic ideas and results which characterize quantum diffusion of defects in quantum crystals like solid helium as a new phenomenon
are presented. Quantum effects in such media lead to a delocalization of point defects (vacancies, impurities etc.) and they
turn into quasiparticles of a new type—defectons, which are characterized not by their position in the crystal lattice but
by their quasimomentum and dispersion law. Defecton-defecton and defecton-phonon scattering are considered and an interpolation
formula for the diffusion coefficient valid in all interesting temperature and concentration regions is presented. A comparison
with the experimental data is made. Some alternative points of view are discussed in detail and the inconsistency of the Kisvarsanyi-Sullivan
theory is shown. 相似文献
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5.
R. Bontchev K. Cheshkova D. Mehandjiev J. Darriet 《Reaction Kinetics and Catalysis Letters》1998,63(1):121-127
The catalytic activity of Ba2Ru0.67Bi1.33O6, Ba2RuBiO6, Ba3Ru2BiO9 and BaRuO3 towards NO-decomposition prior to and after treatment with NH3 has been studied. About 100% degree of conversion has been achieved at 400°C for samples with the highest percentage of hexagonal
stacking in their crystal structures. It has been shown that the active sites are units of two or three face-sharing [RuO6] octahedra in which a strong Ru−Ru interaction takes placevia the common faces. 相似文献
6.
Nikolina L. Petrova Dimitar S. Todorovsky Veselinka G. Vasileva 《Central European Journal of Chemistry》2005,3(2):263-278
Mn-, LaMn- and LaCaMn-citrates were synthesized at 60–120°C in ethylene glycol medium using chlorides or nitrates as metal
sources. Their composition, IR spectra and thermal decomposition were studied. Equimolar La/Mn ratio has been established
in the complex, prepared from chloride solution with the same initial composition of the metals. In the isolated three-metallic
complex the molar ratio of the metals deviates from the composition in the initial solution. The final products of the heating
of Mn- and mixed-metal LaMn-citrates at 1000°C are phase-homogeneous Mn3O4 (hausmannite) and LaMnO3 respectively. Parasitic phase(s) are observed in LaxCa1−xMnyO3, produced from LaCaMn-citrate. 相似文献
7.
The mixed oxide system Cr2O3? MnOx (2 ≥ x ≥ 1.5) was investigated by X-ray diffraction, by measurements of magnetic susceptibility, and by chemical determination of excess oxygen (BUNSEN'S method). The Presence of the antiferromagnetic oxides Cr2O3, β-MnO2, α-Mn2O3 and a ferromagnetic phase Cr1?yMnyO2 was stated. The formation of the latter with fourvalent chromium is explained by a lattice induction effect of the MnO2 (rutile type). 相似文献
8.
A strong chromatographic effect has been established during copper-managenese formate impregnation of γ-Al2O3. The samples obtained have been characterized by adsorption, IR, X-ray and magnetochemistry methods. 相似文献
9.
A Preparative Method for Crosslinking Proteins to DNA in Nuclei by Single-pulse UV Laser Irradiation
Abstract— Photocrosslinking of proteins to DNA by single-pulse UV laser has been used only in analytical experiments, carried out with reconstituted complexes of a single DNA binding protein and a labeled target sequence. Here we propose a large-scale technique for irradiation of nuclei, generating preparative quantities of covalently linked protein-DNA complexes for further analysis of the partner molecules. The use of a flow cuvette allows a milligram of DNA in either nuclei or chromatin to be irradiated by a single pulse within few minutes. The efficiency of crosslinking varies from 6 to 12% of the total nuclear proteins. The presence of histones and other chromosomal proteins in the crosslinked protein-DNA complexes was demonstrated by using specific antibodies. The irradiation procedure can be fully automated using a microcomputer. 相似文献
10.
Kalojan R. Manolov Dimitar W. Kovatschev 《Monatshefte für Chemie / Chemical Monthly》1969,100(4):1233-1239
Zusammenfassung Die Komplexbildung des p-Methylbenzamidoxims (pMB) mit Ni2+ wurde in neutraler und alkalischer Lösung spektrophotometrisch untersucht. In neutraler Lösung wird ein grüner Komplex 11 gebildet, dessen Bildungskonstante 1=1,12 ist. In alkalischer Lösung werden zwei Komplexe (11 und 12) gebildet mit Bildungskonstanten 1=4·105 und 2=0,2.
Mit 6 Abbildungen 相似文献
Nickel complexes with p-methyl benzamide oxime
The complex formation of p-methyl benzamidoxime with Ni2+ was studied spectrophotometrically in neutral and in alkaline solution. A green complex 11 is formed in neutral solution. Its formation constant is 1=1.12. In alkaline solution two complexes (11 and 12) are formed. Their formation constants are 1=4·105 and 2=0,2 resp.
Mit 6 Abbildungen 相似文献