全文获取类型
收费全文 | 154篇 |
免费 | 2篇 |
专业分类
化学 | 102篇 |
力学 | 6篇 |
数学 | 20篇 |
物理学 | 28篇 |
出版年
2019年 | 2篇 |
2018年 | 2篇 |
2017年 | 2篇 |
2016年 | 2篇 |
2015年 | 3篇 |
2014年 | 2篇 |
2013年 | 5篇 |
2012年 | 7篇 |
2011年 | 5篇 |
2010年 | 10篇 |
2009年 | 12篇 |
2008年 | 12篇 |
2007年 | 9篇 |
2006年 | 6篇 |
2005年 | 6篇 |
2004年 | 6篇 |
2003年 | 1篇 |
2002年 | 6篇 |
2001年 | 3篇 |
2000年 | 2篇 |
1999年 | 11篇 |
1998年 | 3篇 |
1997年 | 3篇 |
1996年 | 3篇 |
1995年 | 2篇 |
1993年 | 1篇 |
1992年 | 2篇 |
1991年 | 1篇 |
1990年 | 1篇 |
1989年 | 1篇 |
1988年 | 3篇 |
1986年 | 2篇 |
1985年 | 2篇 |
1984年 | 5篇 |
1983年 | 1篇 |
1982年 | 1篇 |
1981年 | 1篇 |
1979年 | 3篇 |
1978年 | 1篇 |
1977年 | 2篇 |
1974年 | 2篇 |
1973年 | 1篇 |
1969年 | 1篇 |
排序方式: 共有156条查询结果,搜索用时 15 毫秒
1.
We study computable trees with distinguished initial subtree (briefly, I-trees). It is proved that all I-trees of infinite height are computably categorical, and moreover, they all have effectively infinite computable dimension. 相似文献
2.
A. V. Kudinov Yu. G. Kusraev B. P. Zakharchenya V. N. Yakimovich 《Physics of the Solid State》1998,40(5):823-825
Polarized photoluminescence of Cd1−x
MnxTe crystals in a weak magnetic field has been studied in Faraday and Voigt geometries. A simple method is proposed to determine
the exciton mobility edge and excitonic magnetic-polaron energy. “Forbidden” polarization components of the recombination
radiation have been experimentally detected. It has been established that the moments of magnetic polarons are oriented predominantly
along the {111} axes.
Fiz. Tverd. Tela (St. Petersburg) 40, 894–896 (May 1998) 相似文献
3.
Dmitry S. Perekalin Pavel V. Petrovskii Bohumil Štíbr Alexander R. Kudinov 《Journal of organometallic chemistry》2005,690(11):2775-2779
The reaction of the tricarbollide salt Tl[7-tBuNH-7,8,9-C3B8H10] (Tl1) with [(cod)Rh(THF)x]+ gives the rhodium complex [1-(cod)-12-tBuNH-1,2,4,12-RhC3B8H10] in almost quantitative yield. Analogous reactions of Tl1 with [(ring)M(THF)x]2+ ((ring)M = Cp*Rh and (1,3,5-C6H3Me3)Ru) afford the corresponding metallatricarbollides [1-(ring)-12-tBuNH-1,2,4,12-MC3B8H10] in ca. 50% yield. Refluxing Tl1 with [Mn(CO)3(MeCN)3]+ in THF give the tricarbollide analogue of cymantrene, [1,1,1-(CO)3-12-tBuNH-1,2,4,12-MnC3B8H10], the structure of which was determined by single-crystal X-ray diffraction analysis. In all cases, the formation of the metallatricarbollide complexes is accompanied by polyhedral rearrangement leading to the maximum separation of the cage carbon atoms. 相似文献
4.
Quantum-chemical calculations of the geometry and energies of nine possible isomers of 12-vertex cobaltacarborane CpCoC2B9H11 (1) were carried out by the DFT method (PBEPBE/DGDZVP/DGA1). Thermodynamic stability of the isomers increases with increasing
distance between the carbon atoms in the cage and is virtually independent of the position of the CpCo vertex. The relative
stabilities of the 1,2,3-(17.57 kcal mol−1), 1,2,4-(3.72 kcal mol−1), and 1,2,9-isomers of 1 (0 kcal mol−1) are similar to the corresponding values for the ortho (17.61 kcal mol−1), meta (3.21 kcal mol−1), and para isomers (0 kcal mol−1) of carborane C2B10H12. The results of the present study confirm a close similarity of the CpCo and BH fragments in metallacarborane chemistry.
Published in Russian in Izvestiya Akademii Nauk. Seriya Khimicheskaya, No. 7, pp. 1557–1559, July, 2005. 相似文献
5.
E. V. Mutseneck D. A. Loginov A. A. Pronin P. V. Petrovskii A. R. Kudinov 《Russian Chemical Bulletin》2007,56(9):1927-1929
Cationic arene complexes [Cb*Co(naphthalene)]+ (2, Cb* = C4Me4) and [Cb*Co(phenanthrene)]+ were synthesized by the reactions of [Cb*Co(MeCN)3]+ with arenes. The [Cb*Co(anthracene)]+ complex was synthesized by the abstraction of the iodide ion from [Cb*CoI]2 by TIBF4 in the presence of anthracene. Complex 2 exchanges the naphthalene ligand for other arenes at room temperature.
Dedicated to Academician G. A. Abakumov on the occasion of his 70th birthday.
Published in Russian in Izvestiya Akademii Nauk. Seriya Khimicheskaya, No. 9, pp. 1861–1863, September, 2007. 相似文献
6.
A. R. Kudinov D. A. Loginov P. V. Petrovskii M. I. Rybinskaya 《Russian Chemical Bulletin》1998,47(8):1583-1584
Thirty-electron triple-decker complexes with a central pentaphospholyl ligand [(η-C5Me5)Fe(μ-η:η-P5)M(η-C5R5)]BF4 (M=Fe, R=Me or M=Ru, R=H, Me) were synthesized by a stacking reaction of cationic 12-electron fragments [(η-C5R5)M]+ with (η-C5Me5)Fe(η-P5).
Translated fromIzvestiya Akademii Nauk. Seriya Khimicheskaya, No. 8, pp. 1625–1626, August, 1998. 相似文献
7.
A. R. Kudinov L. S. Shul'pina P. V. Petrovskii M. I. Rybinskaya 《Russian Chemical Bulletin》1992,41(3):549-554
Interaction of [Ru(-C
6
H
6
)Cl
2
]
2
with indenyl- or fluorenyllithium in THF gives, together with cationic benzene complexes [Ru(
5
-C
9
H
7
)(-C
6
H
6
)]+ and [Ru(
5
-C
13
H
9
)(-C
6
H
6
)]+, the neutral cyclohexadienyl derivatives Ru(
5
-C
9
H
6
-C
9
H
7
) and Ru(
5
-C
13
H
9
)(
5
-C
6
H
6
-C
13
H
9
), respectively. Interaction of the cyclohexadienyl complexes with Al
2
O
3
, Ph
3
C+, and CF
3
CO
2
H has been studied. Reaction of Ru(
5
-C
13
H
9
)(
5
-C
6
H
7
) with CF
3
CO
2
H in the presence of an arene yields cationic cyclohexadienylarene complexes: [Ru(
5
-C
13
H
9
)(
6
-arene)]+ (arene=C
6
H
6
or 1,3,5-Me
3
C
6
H
3
).A. N. Nesmeyanov Institute of Organoelemental Compounds, Russian Academy of Sciences, 117813 Moscow. Translated from Izvestiya Akademii Nauk, Seriya Khimicheskaya, No. 3, pp. 699–706, March, 1992. 相似文献
8.
Eduard E. Karslyan Andrew I. Konovalov Alexandra O. Borissova Pavel V. Petrovskii Alexander R. Kudinov 《Mendeleev Communications》2012,22(4):189-191
The [2 + 2] photodimerization of the complex [(C5Me4CH2OMe)Ru(η6-C12H8)]+ under visible-light irradiation leads to a mixture of the head-to-head heptacyclene products [(μ-η6: η6-C24H16)Ru2(C5Me4CH2OMe)2]2+ (syn- and anti-) with the predominant formation of the syn-isomer; the structures of both isomers were established by X-ray diffraction analysis. 相似文献
9.
D. A. Loginov M. M. Vinogradov Z. A. Starikova A. R. Kudinov 《Russian Chemical Bulletin》2013,62(5):1262-1267
Visible light irradiation of the dicarbollide complex [(η-9-SMe2-7,8-C2B9H10)Fe(η-C6H6)]+ (2a) in the presence of the benzene derivatives in CH2Cl2/MeNO2 resulted in cations [(η-9-SMe2-7,8-C2B9H10)Fe(η-C6R6)]+ (2b-g; arene is anisole (b), toluene (c), m-xylene (d), mesitylene (e), durene (f), and hexamethylbenzene (g)) due to the arene exchange. The structures of [2g]PF6 and related tricarbollide complex [(η-1-ButNH-1,7,9-C3B8H10)Fe-(η-C6H6)]PF6 (1) were confirmed by X-ray diffraction analysis. The nature of bonding in cations 1, 2a, and [CpFe(η-C6H6)]+ was analyzed by an energy decomposition analysis. 相似文献
10.
D. A. Loginov A. M. Miloserdov Z. A. Starikova J. Holub A. R. Kudinov 《Russian Chemical Bulletin》2013,62(5):1268-1271
Cyclooctadiene complex (η-1-ButNH-1,7,9-C3B8H10)Ir(cod) (1) was obtained by the reaction of [(7-ButNH-7,8,9-C3B8H10)]Tl with [(cod)IrCl]2 in the presence of TlPF6. The reaction of 1 with I2 gave diiodide [(η-1-ButNH-1,7,9-C3B8H10)IrI2]2 (2a). According to the X-ray diffraction data, complex 2a has a dimeric structure with two bridging iodine atoms. 相似文献