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排序方式: 共有147条查询结果,搜索用时 22 毫秒
1.
V. P. Antonovich I. V. Stoyanova N. A. Chivireva E. V. Timukhin V. F. Zinchenko N. P. Efryushina 《Journal of Analytical Chemistry》2007,62(3):238-244
Diffuse reflectance spectroscopy in the UV, visible, and near-IR regions is found to allow the detection and identification of lanthanide oxides, fluorides, sulfides, and sulfofluorides without decomposing and dissolving samples. A nondestructive method for the detection and quantitative determination of more than 1 wt % of Eu(II) in the corresponding fluorides is proposed. 相似文献
2.
The paper studies the Painlevé VIe equations from the point of view of Hamiltonian nonintegrability. For certain infinite number of points in the parameter
space we prove that the equations are not integrable. Our approach uses recent advance in Hamiltonian integrability reducing
the problem to higher differential Galois groups as well as the monodromy of dilogarithic functions.
相似文献
3.
V. I. Simagina V. V. Litvak I. V. Stoyanova V. A. Yakovlev V. M. Mastikhin I. V. Afanasenkova V. A. Likholobov 《Russian Chemical Bulletin》1996,45(6):1321-1324
Hydrodechlorination of chlorobcnzene by chemically bound hydrogen in the presence of transition metal compounds was studied. Alkali and alkaline earth metal hydrides (NaH, MgH2, LiAlH4, NaH(LiAlH4)/12) were used as the sources of the chemically bound hydrogen. The effect of the natures of the hydride and of the transition metal on the activity was studied under comparable conditions. The Pd/C-NaH(LiAlH41/2 catalytic system was found to be the most active. This system made it possible to perform the quantitative dechlorination of 2,3-dichlorodibenzo-p-dioxin at 70 °C.Deceased.Translated fromIzvestiya Akademii Nauk. Seriya Khimicheskaya, No. 6, pp. 1391–1394, June, 1996. 相似文献
4.
I. V. Shkutina O. F. Stoyanova V. F. Selemenev 《Russian Journal of Applied Chemistry》2005,78(6):981-984
Some fundamental aspects of the immobilization of a hydrolytic enzyme glucoamylase via adsorption on aminocarboxylic ion-exchangers with fibrous structure were considered. The sorption capacity of amphoteric supports for the enzyme was studied in relation to the time of immobilization, concentration of hydrogen ions and the protein, and the ionic form of a polyelectrolyte. The catalytic properties of free and immobilized enzymes were compared.__________Translated from Zhurnal Prikladnoi Khimii, Vol. 78, No. 6, 2005, pp. 1003–1005.Original Russian Text Copyright © 2005 by Shkutina, Stoyanova, Selemenev. 相似文献
5.
T. V. Koksharova I. S. Gritsenko I. V. Stoyanova 《Russian Journal of General Chemistry》2006,76(6):862-870
Complexes of Co(II), Ni(II), and Cu(II) valerates and benzoates with semicarbazide were prepared. The compounds were characterized by chemical analysis, X-ray phase analysis, IR spectroscopy, diffuse reflection spectroscopy, and thermal gravimetric analysis. 相似文献
6.
Stefan Stoyanov Tatyana Stoyanova Pericles D. Akrivos Petros Karagiannidis Peter Nikolov 《Journal of heterocyclic chemistry》1996,33(3):927-931
The electronic absorption and emission spectra of some symmetrical heterocyclic disulfides are investigated. The reversible disulfide — thione transformation in water is discussed in view of the complex equilibrium processes present. UV irradiation and pH influence on the above transformation is also studied. The emission properties at room and low temperature are related to the computed molecular geometries of the ground and low excited states of the compounds. 相似文献
7.
Yanislav Danchovski Hristo Rasheev Radostina Stoyanova Alia Tadjer 《Molecules (Basel, Switzerland)》2022,27(20)
All-organic Li-ion batteries appear to be a sustainable and safer alternative to the currently-used Li-ion batteries but their application is still limited due to the lack of organic compounds with high redox potentials toward Li+/Li0. Herein, we report a computational design of nickel complexes and coordination polymers that have redox potentials spanning the full voltage range: from the highest, 4.7 V, to the lowest, 0.4 V. The complexes and polymers are modeled by binding low- and high-oxidized Ni ions (i.e., Ni(II) and Ni(IV)) to redox-active para-benzoquinone molecules substituted with carboxyl- and cyano-groups. It is found that both the nickel ions and the quinone-derived ligands are redox-active upon lithiation. The type of Ni coordination also has a bearing on the redox potentials. By combining the complex of Ni(IV) with 2-carboxylato-5-cyano-1,4-benzoquinones as a cathode and Ni(II)-2,5-dicarboxylato-3,6-dicyano-1,4-benzoquinone coordination polymer as an anode, all-organic Li-ion batteries could be assembled, operating at an average voltage exceeding 3.0 V and delivering a capacity of more than 300 mAh/g. 相似文献
8.
9.
S. P. Denisov V. N. Evdokimov A. V. Kozelova N. N. Prokopenko M. M. Soldatov D. A. Stoyanova V. I. Yakimchuk 《Bulletin of the Lebedev Physics Institute》2010,37(4):104-110
The Cherenkov counter for measuring the numbers of protons in bunches extracted from the IHEP accelerator using a slow extraction
system is described. The measurement range is from 1 to 106 particle/bunch. The maximum bunch frequency is 6 · 106 s–1. Cherenkov light is measured by an XP 2020 photomultiplier. The results of measurements of the XP 2020 signal amplitude on
the applied voltage, obtained using semiconductor light sources are presented. The data of counter calibration on the proton
beam are discussed. 相似文献
10.
D. Kocheva G. Rainovski J. Jolie N. Pietralla A. Blazhev A. Astier R. Altenkirch S. Ansari Th. Braunroth M. L. Cortés A. Dewald F. Diel M. Djongolov C. Fransen K. Gladnishki A. Hennig V. Karayonchev J. M. Keatings E. Kluge J. Litzinger C. Müller-Gatermann P. Petkov M. Rudigier M. Scheck Ph. Scholz P. Spagnoletti M. Spieker C. Stahl R. Stegmann M. Stoyanova P. Thöle N. Warr V. Werner W. Witt D. Wölk K. O. Zell P. Van Isacker V. Yu. Ponomarev 《The European Physical Journal A - Hadrons and Nuclei》2017,53(9):175