全文获取类型
收费全文 | 261篇 |
免费 | 0篇 |
专业分类
化学 | 218篇 |
晶体学 | 1篇 |
力学 | 4篇 |
数学 | 24篇 |
物理学 | 14篇 |
出版年
2018年 | 4篇 |
2017年 | 2篇 |
2016年 | 3篇 |
2015年 | 3篇 |
2014年 | 3篇 |
2013年 | 11篇 |
2012年 | 12篇 |
2011年 | 7篇 |
2010年 | 9篇 |
2009年 | 5篇 |
2008年 | 9篇 |
2007年 | 8篇 |
2006年 | 7篇 |
2005年 | 6篇 |
2004年 | 8篇 |
2003年 | 7篇 |
2002年 | 5篇 |
2001年 | 5篇 |
1999年 | 3篇 |
1998年 | 5篇 |
1997年 | 5篇 |
1996年 | 4篇 |
1995年 | 4篇 |
1994年 | 4篇 |
1993年 | 2篇 |
1991年 | 6篇 |
1990年 | 5篇 |
1989年 | 4篇 |
1988年 | 12篇 |
1987年 | 8篇 |
1986年 | 6篇 |
1985年 | 4篇 |
1984年 | 4篇 |
1983年 | 3篇 |
1982年 | 2篇 |
1981年 | 4篇 |
1980年 | 4篇 |
1979年 | 4篇 |
1977年 | 2篇 |
1976年 | 7篇 |
1975年 | 6篇 |
1974年 | 5篇 |
1973年 | 7篇 |
1972年 | 3篇 |
1971年 | 5篇 |
1969年 | 4篇 |
1968年 | 4篇 |
1967年 | 3篇 |
1966年 | 2篇 |
1962年 | 1篇 |
排序方式: 共有261条查询结果,搜索用时 156 毫秒
1.
2.
Z. S. Klemenkova B. V. Lokshin L. I. Strunkina M. Kh. Minacheva 《Russian Chemical Bulletin》1994,43(9):1516-1521
Raman and IR spectra (4000-50 cm–1) of solid cyclopentadienyl zirconium and hafnium hydrides Cp2MH2, Cp2MD2, Cp2Zr(H)X, and Cp2Zr(D)X (Cp = 5-C5H5; M = Zr, Hf; X = Cl, Br) have been studied. The vibrational modes of MH groups, Cp-rings, and metal-ligand bonds are discussed and the band assignments are proposed. In the solid state, these complexes form polymers with linear hydride bridges of the M-H-M type. The force constants of the M-H and M-Cp bonds increase on going from Zr to Hf.Translated fromIzvestiya Akademii Nauk. Seriya Khimicheskaya, No. 9, pp. 1604–1609, September, 1994. 相似文献
3.
M. G. Ezernitskaya B. V. Lokshin T. Yu. Orlova V. N. Setkina V. I. Shilnikov S. Nunziante Cesaro 《Russian Chemical Bulletin》1994,43(11):1841-1845
FTIR spectra have been studied for staircase cyclopentadienyl complexes containing two or three metal carbonyl fragments bound by the metal-carbon bond Cp(CO)2Fe-CpmMn(CO)3 (1), Cp(CO)2Fe-CpmFe(CO)2CH2Ph (2), Cp(CO)2Fe-Cpm(CO)2Fe-CpmMn(CO)3 (3), Cp(CO)2Mo-Cpm(CO)2Fe-CpmMn(CO)3 (4), Cp(CO)3W-Cpm(CO)2Fe-CpmMn(CO)3 (5), Cp(CO)2Fe-Cpm(CO)2Fe-BmCr(CO)3 (6), Cr(CO)3Bm-CpmFe(CO)2CH2Ph (7), where Cp = 5-C5H5, Cpm = 15-C5H4, Bm = 16-C6H5. Temperature-dependent FTIR spectra were measured inn-pentane solutions over a wide temperature range and in the low-temperature solid matrices of argon and nitrogen. Rotamers, formed due to rotation about the metal-carbon -bond, were found in solutions and matrices. A molecular mechanics calculation of1 proved the possibility of such rotation.Translated fromIzyestiya Akademii Nauk. Seriya Khimicheskaya, No. 11, pp. 1952–1956, November, 1994.The authors are grateful to the Russian Foundation for Basic Research (project code No 93-03-18592) and to the International Science Foundation (project code No MEQ000). 相似文献
4.
A.B. Antonova N.E. Kolobova P.V. Petrovsky B.V. Lokshin N.S. Obezyuk 《Journal of organometallic chemistry》1977,137(1):55-67
A rearrangement of transition metal acetylenic π-complexes into compounds with vinylidene n-ligands has been established. Compounds CpMn(CCHPh)-(CO)2 and Cp2Mn2(μ-CCHPh)(CO)4 with terminal and bridging phenylvinylidene (benzylidenecarbene) ligands respectively were obtained from the π-complexes CpMn(CO)2(PhCCR) where R H, Ph3Ge or Ph3Sn. Reactions leading to conversion of the terminal CCHPh group into a bridging ligand and vice versa were studied. Under the action of L Ph3P, (EtO)3P or (PhO)3P, substitution of CO groups in vinylidene complexes takes place and compounds CpMn(CCHPh)-(CO)L are formed. IR, 1H and 13C NMR spectra of the novel complexes are discussed. The data obtained indicate an electron-withdrawing property of the CCHPh ligand and stronger bonding of this ligand to the metal as compared with a CO group. 相似文献
5.
V. N. Komissarov L Yu Ukhin V. A. Kharlanov V. A. Lokshin E. Yu Bulgarevich V. I. Minkin O. S. Filipenko M. A. Novozhilova S. M. Aldoshin L. O. Atovmyan 《Russian Chemical Bulletin》1992,41(10):1875-1883
Mannich bases exhibiting photo- and thermochromic properties in solutions were synthesized from 3,5-di-tert-butyl-4-hydroxybenzaldehyde and 2-naphthols. An investigation of an acetyl derivative of methylenequinone, modeling a product of photo- and thermochromic transformations, proved that the color change of solutions of the Mannich bases is due to reversible dissociation into colored methylenequinones and morpholine. On the basis of data of x-ray diffraction analysis of one of the Mannich bases, characteristics of their molecular structure were determined, and reasons were stated for their effect on the dissociation mechanism. 相似文献
6.
E. P. Lokshin O. A. Tareeva T. G. Kashulina 《Russian Journal of Applied Chemistry》2007,80(8):1275-1280
Solubility of yttrium, praseodymium, neodymium, and gadolinium sulfates in the presence of sodium and potassium ions and the composition of solid phases were studied at 20°C in relation to the concentration of acids in sulfuric acid, phosphoric acid, and sulfuric-phosphoric acid solutions containing up to 36 wt % H2SO4 and 33.12 g 1?1 H3PO4. 相似文献
7.
8.
L. I. Komarova Ts. M. Frenkel' A. E. Shvorak V. A. Pankratov B. N. Lokshin 《Russian Chemical Bulletin》1996,45(7):1572-1578
The structure of the dimethylbenzylamine (DMBA)—phenylglyc idyl ether (PGE)—phenol complex was studied by IR and1H NMR spectroscopy under various conditions of its formation. The active catalyst in the cyclotrimerization of isocyanates is a complex of composition DMBA : PGE : PhOH = 1 : 1 : 2, in which the oxygen atom of the zwitter-ion PhCH2N+Me2CH2CH(O–)CH2OPh that forms after opening, of the epoxide cycle is bound to two phenol molecules by a very strong hydrogen bonds. In this complex, the oxygen atom of both the zwitter-ion and the phenolate anion can be catalytic centers. Two schemes of the cyclotrimerization of isocyanate in the presence of the aforementioned catalytic system are suggested, depending on whether the catalytic complex has time to form or not.For Part I, see Ref. 1.Deceased.Translated fromIzvestiya Akademii Nauk. Seriya Khimicheskaya, No. 7, pp. 1662–1668, July, 1996. 相似文献
9.
V. I. Ivanenko E. P. Lokshin V. V. Vladimirova Kh. B. Avsaragov 《Russian Journal of Applied Chemistry》2005,78(1):64-70
Procedures for the preparation and granulation of sorbents based on TiO(HPO4)·nH2O from the products of processing of sphene concentrate were developed. The sorption and hydrodynamic characteristics of the sorbents were determined.__________Translated from Zhurnal Prikladnoi Khimii, Vol. 78, No. 1, 2005, pp. 66–72.Original Russian Text Copyright © 2005 by Ivanenko, Lokshin, Vladimirova, Avsaragov. 相似文献
10.
Kunshina G. B. Gromov O. G. Kuz'min A. P. Seitenova E. B. Lokshin E. P. Kalinnikov V. T. 《Russian Journal of Applied Chemistry》2004,77(6):915-920
Solid electrolytes were synthesized in the systems Li2O-Al2O3-TiO2-P2O5 and Li2O-Al2O3-TiO2-P2O5-H2O-H2O2. Their ionic conductivities were studied and compared. The possibility of obtaining a film of Li1
.
3Al0
.
3Ti1
.
7(PO4)3 solid electrolyte on a sapphire substrate from an aqueous peroxide solution of a precursor was analyzed. 相似文献