全文获取类型
收费全文 | 98篇 |
免费 | 1篇 |
专业分类
化学 | 47篇 |
力学 | 3篇 |
数学 | 3篇 |
物理学 | 46篇 |
出版年
2023年 | 1篇 |
2022年 | 1篇 |
2021年 | 1篇 |
2020年 | 1篇 |
2018年 | 2篇 |
2017年 | 1篇 |
2016年 | 4篇 |
2015年 | 1篇 |
2013年 | 2篇 |
2011年 | 3篇 |
2010年 | 4篇 |
2009年 | 6篇 |
2008年 | 5篇 |
2007年 | 5篇 |
2006年 | 2篇 |
2005年 | 2篇 |
2004年 | 5篇 |
2003年 | 3篇 |
2002年 | 2篇 |
2001年 | 4篇 |
1999年 | 1篇 |
1998年 | 4篇 |
1997年 | 6篇 |
1996年 | 3篇 |
1995年 | 3篇 |
1994年 | 2篇 |
1993年 | 2篇 |
1992年 | 2篇 |
1991年 | 2篇 |
1990年 | 2篇 |
1989年 | 2篇 |
1988年 | 3篇 |
1985年 | 5篇 |
1983年 | 1篇 |
1980年 | 1篇 |
1978年 | 1篇 |
1976年 | 1篇 |
1975年 | 1篇 |
1973年 | 1篇 |
1928年 | 1篇 |
排序方式: 共有99条查询结果,搜索用时 15 毫秒
11.
R. F. Trunin G. V. Boriskov A. I. Bykov A. B. Medvedev G. V. Simakov A. N. Shuikin 《JETP Letters》2008,88(3):189-191
The experimental data on the shock compression of liquid nitrogen in the megabar pressure range are reported. The experiments have been performed with a spherical measuring setup in which pressure is created by the impact of a steel shell accelerated to a velocity of 23 km/s on the samples. The density of shock-compressed nitrogen at a pressure of about 320 GPa is about 3.4 g/cm3 (compression degree of about 4.2). The experimental data are described using a model equation of state. 相似文献
12.
13.
G. V. Girichev N. I. Giricheva N. V. Tverdova A. O. Simakov N. P. Kuz’mina O. V. Kotova 《Journal of Structural Chemistry》2010,51(2):223-230
Gas electron diffraction at a temperature T of 641(5) K is used to study the structure of an N,N′-ethylenebis(salicylaldiminato) zinc(II) molecule, ZnO2N2C16H14, further Zn(salen). The structure of a gaseous Zn(salen) complex has C 2 symmetry and is characterized by a substantial turn of two chelating fragments of the ligand with respect to each other, and also by a big difference in the length of coordination bonds: r h1(Zn-O)=1.902(7) Å r h1(Zn-N)= 2.027(7) Å. Results of the DFT/B3LYP calculation with 6-31G* and CEP,TZV basis sets of the molecule structure well agree with the experimental data. The electronic structure of Ni(salen), Cu(salen), Zn(salen), and Zn(acacen) molecules is considered. 相似文献
14.
N. N. Simakov 《Technical Physics》2011,56(11):1562-1569
The effect of the incoming flow geometry on the hydrodynamic drag of a body is investigated in a numerical experiment simulating
a free gas flow past a sphere as well as flows in cylindrical tubes of various radii, in a confuser, and a diffuser. The results
of calculations lead to the conclusion that the confinement of the flow by the tube walls, its contraction and expansion may
change the hydrodynamic force and the drag acting on the body insignificantly (not more than by 30%). This cannot explain
the early drag crisis, in which the values of these quantities decrease by 4–7 times for Reynolds numbers on the order of
100. This phenomenon is explained theoretically by the effect of strong turbulence of the incoming flow to the body. 相似文献
15.
The deposition of tin oxide films by reactive sputtering of a stoichiometric target is investigated. Conditions are determined
for the formation of a crystal layer structure and the acquisition of gas sensitivity without subsequent high-temperature
annealing.
Zh. Tekh. Fiz. 69, 112–113 (April 1999) 相似文献
16.
Shestakov A. S. Shikhaliev Kh. S. Sidorenko O. E. Kartsev V. G. Simakov S. V. 《Russian Journal of Organic Chemistry》2009,45(5):777-782
Russian Journal of Organic Chemistry - Reactions of methyl 3-amino-1H-indole-2-carboxylates with aryl isocyanates, aryl isothiocyanates, and cyanamides led to the formation of... 相似文献
17.
Simakov V. I. Kurbatov S. V. Borbulevych O. Ya. Antipin M. Yu. Olekhnovich L. P. 《Russian Chemical Bulletin》2001,50(6):1064-1067
Condensation of ortho-aminophenols and N-benzylsulfonyl-o-phenylenediamine with ninhydrin afforded tetracyclic products, the amino group entering into condensation with the carbonyl group at position 1 of ninhydrin. The structures of the reaction products were established by 1H NMR spectroscopy and X-ray diffraction analysis. 相似文献
18.
I. A. Nechaev A. V. Dubovik V. I. Simakov V. S. Demidenko 《Physics of the Solid State》1997,39(5):716-717
Using a method based on incorporating statistics into the theory of multiple scattering via the distribution function of atoms
on lattices, the electronic structure of the intermetallic Co3Ti is calculated for both complete atomic order and complete disorder. An unusual feature of the electronic structure of this
intermetallic when it is disordered in the solid state is identified. Possible consequences of this behavior are analyzed.
Fiz. Tverd. Tela (St. Petersburg) 39, 809–810 (May 1996) 相似文献
19.
O. V. Komova A. V. Simakov L. T. Tsykoza N. N. Sazonova V. A. Ushakov G. B. Barannik Z. R. Ismagilov 《Reaction Kinetics and Catalysis Letters》1995,54(2):361-369
The activity of Cu–Ti oxide catalysts has been studied in the selective catalytic reduction of NO with ammonia. We have elucidated how the nature ofstarting titania affects the catalyst activity in this reaction. 相似文献
20.
Abstract The behavior of V–Mg oxide catalysts in both steady and non-steady state butylene oxidation has been examined.
, .相似文献