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21.
O. V. Belousov R. V. Borisov S. M. Zharkov V. A. Parfenov L. I. Dorokhova 《Russian Journal of Physical Chemistry A, Focus on Chemistry》2012,86(3):484-488
The redox potential of fine-dispersed and compact bimetallic powders of the palladium-gold system in hydrochloric acid solutions
of H2PdCl4 at a temperature of 60°C was studied. It was found that the redox potential increases with gold enrichment of the solid solution
in accordance with the Nernst equation. The effect of gold-palladium particle size on this redox potential is shown. The morphology,
sizes, and composition of bimetallic particles are determined via transmission electron microscopy and X-ray diffraction analysis. 相似文献
22.
建立了非紧FC-空间中新的连续选择定理,作为应用,获得了非紧FC-空间中广义模糊约束多目标对策的弱Pareto平衡存在定理.我们的结论统一、改进和推广了一些近期文献的已知结果. 相似文献
23.
Self-induced filamentation of the current near the edges of a sample in the Hall geometry has been observed in the quantum-Hall-effect
regime in a two-dimensional electronic system arising near a GaAs/AlGaAs heterojunction. If in the case of integer values
of the filling factor ν averaged over the sample the currents flowing along opposite edges are approximately the same, then
away from such a value within the quantum plateau the current is increasingly concentrated near that edge of the sample where
the local value of ν is closer to being an integer. When the direction of the magnetic field or of the current changes, the
filament switches to the opposite edge of the sample.
Pis’ma Zh. éksp. Teor. Fiz. 68, No. 9, 700–704 (10 November 1998) 相似文献
24.
S. I. Dorozhkin M. O. Dorokhova R. J. Haug K. Ploog 《Physica E: Low-dimensional Systems and Nanostructures》1998,1(1-4)
By the method of capacitance spectroscopy and of magnetotransport we have investigated the
and
fractional-quantum-Hall-effect (FQHE) states in gated GaAs
AlGaAs heterojunctions with tuned electron areal density. Our experimental results confirm the theoretical prediction of the fractional quasiparticle charge
in the
FQHE state and of the existence of spin-aligned quasiholes and spin-reversed quasielectrons in the fully spin-polarized
FQHE state. 相似文献
25.
Dorokhova V. V. Patovskii G. V. Tomikhin B. V. Grechkin E. F. Kalabina A. V. 《Russian Physics Journal》1972,15(11):1553-1556
Measurements have been made of the integral Raman line strength of unsaturated phosphorus acids; it is concluded that the phosphorus-bearing group interacts with the-electron system of the aromatic radical in the excited state. It is found that the -PCl2, -P(O)Cl2 and -P(S) · Cl2 will show acceptor behavior in the conjugated system when interacting with donor substituents. The role of the vacant orbitals of the chlorine attached to the phosphorus is discussed.Translated from Izvestiya Vysshikh Uchebnykh Zavedenii Fizika, No. 11, pp. 25–28, November, 1972. 相似文献
26.
O. V. Belousov Yu. V. Saltykov L. I. Dorokhova L. A. Solov’ev S. M. Zharkov 《Russian Journal of Physical Chemistry A, Focus on Chemistry》2008,82(4):647-650
It was found that metastable equilibrium in the heterogeneous reaction
in H2PdCl4-hydrochloric acid solutions at 60°C depended on the dispersity of metallic palladium. It was shown experimentally that the
dependence of the shift of the PdCl42−/Pd0 redox potential on the dispersity of palladium(0) was described by the Thomson equation.
Original Russian Text ? O.V. Belousov, Yu.V. Saltykov, L.I. Dorokhova, L.A. Solov’ev, S.M. Zharkov, 2008, published in Zhurnal
Fizicheskoi Khimii, 2008, Vol. 82, No. 4, pp. 749–753. 相似文献
27.
Gamze G
GER Ümmühan TÜRKYOLU Ezgi Nur GÜREN Süleyman YUR Abdullah Burak KARADUMAN Fatih G
GER Mehmet TEKN Gülmira
ZEK 《Turkish Journal of Chemistry》2021,45(2):387
In the present work, essential oil and fatty acids and extracts obtained from aerial parts of Phlomis linearis Boiss. & Bal. were investigated for chemical composition and biological activities. The phytochemical analyses were conducted with gas chromatography-mass spectrometry/flame ionisation detector (GC-MS/FID) and liquid chromatography-mass spectromtetry (LC-MS/MS) techniques. The extracts and essential oil were studied for α-amylase and acetylcholinesterase activities with two different spectrophotometric methods. Antimicrobial activities of the extracts were investigated by microdilution. The extracts were evaluated in vitro for cytotoxic effects against cancer and normal cell lines by MTT assay. The essential oil (EO) contained α-pinene (12.5%) and β-caryophyllene (10.7%) as main compounds. Palmitic (26.5%) and nonadecanoic acids (26.6%) were determined as fatty acids. Phytochemical analysis of the extracts found phenolic acids, phlinosides, verbascoside, and flavonoids. The extracts and essential oil demonstrated poor α-amylase inhibitory activity. The best acetylcholinesterase inhibitory activity was obtained for diethly ether extract of P. linearis (67.2 ± 3.4%) at 10 mg /mL concentration. Ethyl acetate extract found to be effective against Staphlococcus aureus at a minimum inhibitory concentration (MIC) of 156.26 µg/mL. Diethyl ether extract of P. linearis was active on A549 cell lines with an IC50 = 316 ± 4.16 µg/mL when compared with cisplatin IC50 = 24.43 ± 0.14 µg/mL. To the best of our knowledge, the present work is the first comprehensive report on anti-acetylcholinesterase, anti-α-amylase, and antimicrobial activities, as well as cytotoxic effects of P. linearis. 相似文献
28.
以新鲜怀菊花为原料,用芦丁为对照品,硝酸铝作为显色剂,正交设计优化怀菊花中总黄酮提取条件,采用超声波和水浴提取法等2种工艺提取怀菊花中总黄酮,研究单因素对总黄酮提取率的影响,确定提取总黄酮的最佳条件,同时用碘量法研究对猪油的抗氧化性作用.水浴提取怀菊花总黄酮以A1B1C3组合为最佳提取条件,提取率为109.74mg/g.超声波提取怀菊花总黄酮以A2B2C2组合为最佳提取条件,提取率为114.47mg/g.实验结果表明,超声波法提取效果优于水浴提取法,怀菊花黄酮对猪油有一定的抗氧化能力. 相似文献
29.
30.
T. N. Dorokhova L. R. Lyusova A. A. Popov L. S. Shibryaeva S. G. Karpova 《Polymer Science Series D》2012,5(3):141-144
Adhesion and mechanical properties of vinyl aromatic thermoplastic elastomers on the Russian market were studied. Significant
differences between the materials were shown that are due to differences in the chemical natures and structural parameters
of block copolymers. 相似文献