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1.
T. V. Gubaidulina N. I. Chistyakova V. S. Rusakov 《Bulletin of the Russian Academy of Sciences: Physics》2007,71(9):1269-1272
Natural and synthetic layered iron hydroxysulfides: tochilinite and valleriite, have been investigated by Mössbauer spectroscopy. Tochilinite, magnetite, troilite, and pyrite phases were found in the products of tochilinite synthesis under different conditions. The relative contents of the phases found are determined as functions of the relative magnesium content in the initial mixture. Crystallochemical identification of the 57Fe subspectra of valleriite has been performed. 相似文献
2.
Changes in the stability of the cadmium(ii) ethylenediamine complexes in mixed water—DMSO solvents were studied by pH-metry and calorimetry. Complex cations [Cd(en)]2+, [Cd(en)2]2+, and [Cd(en)3]2+ are formed in aqueous solutions, and the [Cd(en)4]2+ complex with a partially dentate ligand is stable in DMSO. An increase in the DMSO content in a solvent increases the stability of the complexes. The maximum increase in logK is observed for coordinatively saturated compounds. The thermodynamics of complexation is discussed from the viewpoint of solvation approach. Principal differences in the influence of aqueous-alcohol and aqueous-aprotic solvents on the stability of the metal amino complexes were revealed. Protolytic solvents exert a destabilizing effect on the multiligand complexes, because the coordination sphere is involved in H bonding. 相似文献
3.
A polysaccharide has been isolated from the leaves ofPhytolacca americana and has been characterized. It has been established that it contains residues of galactose, arabinose, xylose, and rhamnose, in a ratio of 3:4:1:3 and also D-galacturonic acid (85–90%). The results obtained permit the polysaccharide to be assigned to the class of pectin substances.All-Union Oncologic Scientific Center, Academy of Medical Sciences of the USSR, Moscow. Translated from Khimiya Prirodnykh Soedinenii, No. 2, pp. 166–169, March–April, 1982. 相似文献
4.
M. Markina T. Chistyakova N. Tristan B. Büchner A. Bush A. Vasiliev 《Journal of Experimental and Theoretical Physics》2007,105(1):18-20
Single crystals of Li x Na1 ? x Cu2O2 solid solutions have been grown from the melt and crystal lattice parameters have been studied. It is found that the solid solution of this system exists in the region x ≤ 0.25. Specific heat and magnetic susceptibility are investigated on monocrystalline samples with x = 0.07, 0.14, and 0.21. Long-range magnetic order in these compounds is formed at T = 13.8, 4.1, and 14.8 K, respectively. It is found that the Néel temperature T N in these compounds increases with Li content. 相似文献
5.
N. I. Chistyakova V. S. Rusakov A. A. Shapkin T. N. Zhilina D. G. Zavarzina 《Hyperfine Interactions》2010,197(1-3):325-330
Mössbauer investigations between 4.5 and 300 K of iron minerals formed during the growth of the binary culture containing two anaerobic alkaliphilic bacteria-dissimilatory iron-reducing Geoalkalibacter ferrihydriticus (strain Z-0531) and organotrophic Anaerobacillus alkalilacustre (strain Z- 0521), have been carried out. Mannitol (2 g/l) as the sole substrate with amorphous Fe(III) hydroxide at final concentration 10 or 100 mM were added to the mineral medium. The formation of siderite and probable magnetite or a mixture of magnetite and maghemite were observed. 相似文献
6.
7.
Application of the least squares method to solving linear differential-algebraic equations 总被引:1,自引:0,他引:1
We consider an application of the least squares method to numerical solving a linear system of ordinary differential equations (ODEs) with an identically singular or rectangular matrix multiplying the highest derivative of the desired vector-function. The behavior of gradient methods for minimizing the squared residual in Sobolev spaces and some other issues are discussed. Results of some numerical experiments are given. 相似文献
8.
M. V. Bulatov E. V. Chistyakova 《Computational Mathematics and Mathematical Physics》2011,51(9):1558-1566
Integro-differential systems in which the matrix multiplying the derivative of the unknown vector function is identically
singular are analyzed. This analysis is based on the special properties of the matrix polynomials associated with the original
system. An existence theorem is proved, and a numerical method for finding the solution is proposed and justified. 相似文献
9.
10.
M. V. Volovetsky V. S. Rusakov N. I. Chistyakova O. A. Lukanin 《Hyperfine Interactions》2008,186(1-3):83-88
Room temperature 57Fe Mössbauer spectroscopy has been used to investigate the structural and oxidation state of Fe in tektites from different strewn fields. Spectra have been analyzed in terms of two quadrupole splitting distributions corresponding to Fe3?+? and Fe2?+?. All tektites show similar distribution of quadrupole splitting. Each distribution has one peak. The Fe2?+? sites show a narrow region of Mössbauer line shift (δ) and quadrupole splitting (ε), δ?= 1.02–1.10 mm/s and ε?= 0.85–1.00 mm/s relative to α-Fe. These values have been assigned to intermediate coordination between tetrahedral and octahedral. The Fe3?+? sites show wider regions of hyperfine parameters: δ?= 0.25–0.45 mm/s and ε?= 0.65–0.90 mm/s. The Fe3?+?/Fe2?+? ratio was found to be 0.05–0.15. 相似文献