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排序方式: 共有1995条查询结果,搜索用时 31 毫秒
91.
Mikhailov I. E. Artyushkina Yu. M. Dushenko G. A. Minkin V. I. 《Russian Journal of General Chemistry》2020,90(11):2059-2063
Russian Journal of General Chemistry - 2-Aryl-5-butyl-1,3,4-oxadiazoles have been obtained in 59–85% yield via refluxing of equimolar amounts of a benzoic acid hydrazide with trimethyl... 相似文献
92.
Lipin K. V. Ershov O. V. Fedoseev S. V. Mikhailov A. A. 《Russian Journal of Organic Chemistry》2020,56(1):177-180
Russian Journal of Organic Chemistry - Previously unknown 3-R-sulfanyl-5-amino-1-phenyl-1H-pyrazole-4-carbonitriles were synthesized by reactions of 2-[bis(alkylsulfanyl)methylidene]malononitriles... 相似文献
93.
I.F. Mikhailov A.A. Baturin A.I. Mikhailov S.S. Borisova S.V. Surovitskiy 《X射线光谱测定》2020,49(2):284-290
Compton to Rayleigh scattering intensity ratios (IC/IR) have been measured using X-rays with energy 17.44 keV for single-component materials with atomic number Z from 4 (Be) to 31 (Ga) and binary compounds of stoichiometric composition. The measurements have been performed using two optical schemes: an energy-dispersive X-ray fluorescence scheme with a molybdenum secondary target and wavelength-dispersive X-ray fluorescence one. The processing of the spectra was carried out by fitting with Pearson VII functions. For single-component and binary standards, the experimental dependence of the scattering intensity ratio on the atomic number was found to be the same. This confirms the additivity of the contribution of different atoms to the scattering. The dependence has a complex shape but is well described by the theoretical relationship for IC/IR with correction on the difference between Compton and Rayleigh radiation absorption coefficients. Two ranges of atomic number values are defined, in which the effective atomic number Zeff can be determined by the calibration method using this dependence: for Z from 4 to 7 with low error of ΔZeff =±0.15 and for Zeff from 10 to 18 with low error of ΔZeff =±0.69. A change in the shape of the Compton peak and an overestimated value of the of the Compton and Rayleigh peak intensity ratio when passing from a single-component scatterer (Al or Si) to their oxides Al2O3 or SiO2, respectively, have been revealed. 相似文献
94.
Kinga Nawalany Aleksandra Rusin Mariusz Kpczyski Alexei Mikhailov Gabriela Kramer-Marek Mirosaw
nietura Jan Potowicz Zdzisaw Krawczyk Maria Nowakowska 《Journal of photochemistry and photobiology. B, Biology》2009,97(1):8-17
Two photosensitizing systems: (1) tetrakis(4-hydroxyphenyl)porphyrin (p-THPP) encapsulated in sterically stabilized liposomes (SSL) and (2) p-THPP functionalized by covalent attachment of poly(ethylene glycol) (p-THPP–PEG2000) were studied in vitro. The dark and photo cytotoxicity of these systems were evaluated on two cell lines: HCT 116, a human colorectal carcinoma cell line, and DU 145, a prostate cancer cell line and compared with these determined for free p-THPP. It was demonstrated that both encapsulation in liposomes as well as attachment of PEG chain result in pronounced reduction of the dark cytotoxicity of the parent porphyrin. The liposomal formulation showed higher than p-THPP–PEG2000 photocytotoxicity towards both cell lines used in the studies. 相似文献
95.
T. I. Mikhailova B. Erdemchimeg G. Kaminski A. G. Artyukh M. Colonna M. Di Toro I. N. Mikhailov Yu. M. Sereda H. H. Wolter 《Bulletin of the Russian Academy of Sciences: Physics》2009,73(6):852-857
The asymmetry of velocity distributions of projectile-like fragments produced in heavy ion collisions is considered. The calculations
performed in the transport model approach (Vlasov kinetic equation with the collision term) are compared with the experimental
data for the 22Ne (40MeV/nucleon) + 9Be and 18O (35 MeV/nucleon) + 9Be(181Ta) reactions. It is found that the velocity distributions contain two components: a direct component centered at the beam
velocity and a dissipative component at lower energies, leading to asymmetry of velocity distributions. The direct component
is interpreted empirically within the Goldhaber model, and the centroids and widths σ0 of the distributions for each fragment are extracted. It is found that value of σ0 derived from experimental data is smaller by a factor of 2 than the theoretical one. The dissipative (also called deep inelastic)
component is described well by the transport calculations. It is shown that the ratio of yields of direct and dissipative
components, which determines the asymmetry of velocity distributions, depends on shape of the deflection function.
Original Russian Text ? T.I. Mikhailova, B. Erdemchimeg, G. Kaminski, A.G. Artyukh, M. Colonna, M. Di Toro, I.N. Mikhailov,
Yu.M. Sereda, H.H. Wolter, 2009, published in Izvestiya Rossiiskoi Akademii Nauk. Seriya Fizicheskaya, 2009, Vol. 73, No.
6, pp. 898–903. 相似文献
96.
L. I. Govor A. M. Demidov V. A. Kurkin I. V. Mikhailov 《Physics of Atomic Nuclei》2009,72(11):1799-1811
The spectrum of gamma rays from the reaction 160Gd(n, n′γ) and their angular distribution with respect to the neutron-beam axis are measured by using fast reactor neutrons. The scheme
of energy levels and gamma transitions is composed for 160Gd. Multipole-mixture parameters δ are found for many gamma transitions. 相似文献
97.
98.
G. P. Mikhailov L. V. Rabchuk V. V. Lazarev 《Russian Journal of Inorganic Chemistry》2017,62(4):523-526
Manifestations of ion association of lithium cation with BrO3 - ion in the vibrational spectrum have been studied by IR spectroscopy. The microstructure of the bromate ion with lithium cation in a contact ion pair in an aprotic solvent has been determined by the density functional theory method in the B3LYP/cc-pVTZ approximation, and the vibrational spectrum of coordinated bromate ion has been calculated. 相似文献
99.
M. M. Mikhailov 《Journal of Surface Investigation: X-ray, Synchrotron and Neutron Techniques》2013,7(4):745-752
Changes in the diffuse reflectance spectra of titanium-dioxide micropowders (initial, modified by nanoparticles, treated with oxidants such as potassium peroxoborate and sodium peroxide, or ultraviolet irradiated in an oxygen atmosphere) in the range 0.3–2.1 μm after irradiation with ultraviolet light, electrons, or protons are analyzed. The general and distinctive features of changes in the spectra in the visible and near infrared regions are revealed and an explanation of the obtained data is proposed. 相似文献
100.