全文获取类型
收费全文 | 96篇 |
免费 | 0篇 |
专业分类
化学 | 49篇 |
晶体学 | 7篇 |
力学 | 6篇 |
数学 | 3篇 |
物理学 | 31篇 |
出版年
2022年 | 1篇 |
2021年 | 2篇 |
2019年 | 3篇 |
2018年 | 7篇 |
2017年 | 6篇 |
2016年 | 5篇 |
2015年 | 4篇 |
2014年 | 7篇 |
2013年 | 4篇 |
2012年 | 6篇 |
2011年 | 3篇 |
2010年 | 8篇 |
2009年 | 3篇 |
2008年 | 1篇 |
2007年 | 2篇 |
2006年 | 1篇 |
2005年 | 1篇 |
2004年 | 1篇 |
2003年 | 1篇 |
2002年 | 1篇 |
2001年 | 3篇 |
2000年 | 1篇 |
1999年 | 2篇 |
1998年 | 1篇 |
1997年 | 2篇 |
1992年 | 2篇 |
1991年 | 3篇 |
1989年 | 1篇 |
1985年 | 1篇 |
1980年 | 1篇 |
1975年 | 2篇 |
1972年 | 1篇 |
1971年 | 2篇 |
1970年 | 3篇 |
1969年 | 1篇 |
1968年 | 1篇 |
1967年 | 1篇 |
1966年 | 1篇 |
排序方式: 共有96条查询结果,搜索用时 15 毫秒
1.
Yu. M. Mil'grom Ya. V. Rashkes L. I. Strugina V. L. Sadovskaya 《Chemistry of Natural Compounds》1992,27(4):455-457
LSIMS mass spectra of pennogenin glycosides have been studied; the most characteristic ions are (M+H–H2O)+ (with glycerol as the liquid matrix) and (M+Na)+ (with glycerol +NaCl as matrix). In both cases the peaks of ions formed as the result of the successive elimination of the carbohydrate units, the breakdown of the bonds of the terminal pyranoses, the cleavage of the bonds of the rings D and E, and the peaks of the ions Agl+ and (Agl–H2O)+ were observed.Institute of Chemistry of Plant Substances, Academy of Sciences of the Uzbek SSR, Tashkent. All-Union Scientific-Research Institute for Agricultural Biotechnology, All-Union Academy of Agricultural Sciences, Moscow. Pacific Institute of Bioorganic Chemistry, Far Eastern Branch, Academy of Sciences of the USSR, Vladivostok. Translated from Khimiya Prirodnykh Soedinenii, No. 4, pp. 523–525, July–August, 1991. 相似文献
2.
Reaction Kinetics and Mechanism of Selective NO Reduction on a CoZSM-5 Catalyst as Studied by SSITKA
Sadovskaya E. M. Suknev A. P. Goncharov V. B. Bal'zhinimaev B. S. Mirodatos C. 《Kinetics and Catalysis》2004,45(3):436-445
The dynamics of 13C transfer from methane to carbon dioxide was studied under the steady-state reaction conditions of selective NO reduction with methane on a CoZSM-5 catalyst at various reactant (NO, CH4, and O2) concentrations and temperatures. It was found that the reaction occurs by a two-pathway mechanism with the participation of Co2+ sites (or CoO
x
clusters) and paired Co2+–OH sites localized at the boundary between the clusters and the zeolite; in this case, the rate of the reaction at boundary sites was higher by more than one order of magnitude. Based on the numerical simulation of isotopic response curves, the concentrations of intermediate compounds and the rate constants of particular steps were evaluated; differences in the kinetics via the above reaction pathways were found and analyzed. 相似文献
3.
B. S. Balzhinimaev V. E. Ponomarev G. K. Boreskov A. A. Ivanov V. S. Sheplev E. M. Sadovskaya 《Reaction Kinetics and Catalysis Letters》1985,28(1):81-88
Diffusion and solubility coefficients of O2, SO2 and SO3 in the active component of vanadium catalysts have been determined by a high-speed relaxation method. Processes of their dissolution are shown to be quasi-equilibrium with respect to catalytic reactions.
O2, SO2 SO3 ,相似文献
4.
5.
This paper reports on the results of investigations of the thermal conductivity along the three crystallographic directions in bismuth tellurite crystals. It is found that bismuth tellurite exhibits a low thermal conductivity inherent in glasses and disordered solid solutions. At temperatures below the Debye temperature, the thermal conductivity coefficients depend on the temperature as \(\sqrt T \), which is characteristic of disordered solid solutions. The temperature dependence of the thermal conductivity of bismuth tellurite is calculated in the framework of the Debye model. 相似文献
6.
D. V. Ivanov L. G. Pinaeva E. M. Sadovskaya L. A. Isupova 《Kinetics and Catalysis》2011,52(3):401-408
Radically different dependences of the activity of La1 − x
Sr
x
MnO3 (x = 0−0.5) perovskites in methane oxidation on the degree of substitution of strontium for lanthanum are observed for low and
high temperatures. Unsubstituted LaMnO3 exhibits the highest activity in the temperature range from 300 to 500°C, while the sample with the maximum degree of substitution
(La0.5Sr0.5MnO3) shows the highest activity at higher temperatures of 700–900°C. In the low temperature region, the activity of La1t - x
Sr
x
MnO3 is determined by the amount of weakly bound (overstoichiometric) oxygen, which is formed in cation-deficient lattices and
is characterized by a thermal desorption peak with T
max = 705°C. At higher temperatures (800–900°C), the strongly bound oxygen of the catalyst lattice is involved in the formation
of the reaction products under both unsteady- and steady-state conditions. As a consequence, the catalytic activity in methane
oxidation correlates with the apparent rate constant of oxygen diffusion in the oxide bulk. 相似文献
7.
8.
9.
10.
N. V. Sadovskaya A. Yu. Obvintsev R. S. Khatipov D. I. Seliverstov S. A. Khatipov 《Journal of Surface Investigation: X-ray, Synchrotron and Neutron Techniques》2016,10(5):917-924
The supramolecular structure and tribological properties of filled polytetrafluoroethylene composites irradiated above the melting point of the crystalline phase of the polymer component and the phase transitions in them are investigated. In unirradiated composites, phase separation is observed, that is, the separation of the filler from the polymer matrix. The supramolecular structure of the polymer component does not depend on the nature and concentration of the filler, and it is characterized by the formation of lamellae during sintering and subsequent crystallization. Radiation exposure leads to the disappearance of the phase separation and the formation of axiolites with the radial orientation of fibrils, in the center of which the filler particles are located. Changes in the structure are explained by an increase in interfacial interactions through the radiation grafting of macromolecules (and low-molecular-weight products) to the surface of the filler particles. The linear wear rate of irradiated composites is 50 times lower relative to the unirradiated samples because of the transition from the delamination to abrasive wear mechanism. 相似文献