全文获取类型
收费全文 | 121篇 |
免费 | 5篇 |
专业分类
化学 | 75篇 |
力学 | 1篇 |
数学 | 42篇 |
物理学 | 8篇 |
出版年
2023年 | 2篇 |
2022年 | 3篇 |
2021年 | 6篇 |
2020年 | 4篇 |
2019年 | 5篇 |
2017年 | 2篇 |
2016年 | 3篇 |
2015年 | 5篇 |
2013年 | 5篇 |
2012年 | 5篇 |
2011年 | 9篇 |
2010年 | 1篇 |
2009年 | 3篇 |
2008年 | 2篇 |
2007年 | 5篇 |
2006年 | 9篇 |
2005年 | 2篇 |
2004年 | 3篇 |
2002年 | 3篇 |
2001年 | 2篇 |
1996年 | 1篇 |
1995年 | 2篇 |
1988年 | 2篇 |
1980年 | 1篇 |
1979年 | 1篇 |
1976年 | 2篇 |
1975年 | 1篇 |
1974年 | 3篇 |
1972年 | 1篇 |
1970年 | 1篇 |
1969年 | 1篇 |
1968年 | 1篇 |
1966年 | 1篇 |
1965年 | 1篇 |
1964年 | 1篇 |
1963年 | 2篇 |
1962年 | 1篇 |
1961年 | 2篇 |
1960年 | 1篇 |
1959年 | 4篇 |
1958年 | 1篇 |
1957年 | 1篇 |
1956年 | 2篇 |
1955年 | 5篇 |
1954年 | 1篇 |
1944年 | 1篇 |
1941年 | 1篇 |
1940年 | 1篇 |
1937年 | 1篇 |
1935年 | 1篇 |
排序方式: 共有126条查询结果,搜索用时 15 毫秒
1.
2.
Beswick CL Terroba R Greaney MA Stiefel EI 《Journal of the American Chemical Society》2002,124(33):9664-9665
Reaction of a stoichiometric equivalent of the zinc-dithiolene complex, (tmeda)ZnS2C2(COOMe)2 (tmeda = tetramethylethylenediamine), with (MeCN)2PdCl2 results in a 1:1 homoleptic dithiolene that forms the hexanuclear cluster [PdS2C2(COOMe)2]6 (1). X-ray structure analysis of 1 indicates a Pd6S12 core comprised of six face-centered palladium atoms and 12 edge-centered sulfur atoms situated on an imaginary approximate cube. Complex 1 undergoes four distinct and reversible one-electron redox steps in dichloromethane at -186, -484, -1174, and -1524 mV versus a standard calomel electrode (ferrocenium+/ferrocene redox couple 409 mV). The two-electron reduction product of 1, [Bu4N]2[(PdS2C2(COOMe)2)6] (2), has been chemically isolated and characterized. 相似文献
3.
4.
Constanze Keck Dr. Jennifer Hahn Divanshu Gupta Prof. Dr. Holger F. Bettinger 《Chemistry (Weinheim an der Bergstrasse, Germany)》2022,28(5):e202103614
The boron-nitrogen analogue of ortho-benzyne, 1,2-azaborinine, is a reactive intermediate that features a formal boron-nitrogen triple bond. We here show by combining experimental and computational techniques that the Lewis acidity of the boron center of dibenzo[c,e][1,2]azaborinine allows interaction with the silicon containing single bonds Si−E through the silicon bonding partner E (E=F, Cl, OR, H). The binding to boron activates the Si−E bonds for subsequent insertion reaction. This shows that the BN-aryne is a ferocious species that even can activate and insert into the very strong Si−F bond. 相似文献
5.
Dr. Peter Thumbs M. Sc. Timm T. Ensfelder M. Sc. Markus Hillmeier Dr. Mirko Wagner M. Sc. Matthias Heiss M. Sc. Constanze Scheel M. Sc. Alexander Schön Dr. Markus Müller Prof. Dr. Stylianos Michalakis Dr. Stefanie Kellner Prof. Dr. Thomas Carell 《Angewandte Chemie (Weinheim an der Bergstrasse, Germany)》2020,132(30):12451-12455
6.
Thomas Harmening Constanze M. Fehse Rainer Pöttgen 《Journal of solid state chemistry》2011,184(12):3303-3309
The silicides ScTSi (T=Fe, Co, Ni, Cu, Ru, Rh, Pd, Ir, Pt) were synthesized by arc-melting and characterized by X-ray powder diffraction. The structures of ScCoSi, ScRuSi, ScPdSi, and ScIrSi were refined from single crystal diffractometer data. These silicides crystallize with the TiNiSi type, space group Pnma. No systematic influences of the 45Sc isotropic magnetic shift and nuclear electric quadrupolar coupling parameters on various structural distortion parameters calculated from the crystal structure data can be detected. 45Sc MAS-NMR data suggest systematic trends in the local electronic structure probed by the scandium atoms: both the electric field gradients and the isotropic magnetic shifts relative to a 0.2 M aqueous Sc(NO3)3 solution decrease with increasing valence electron concentration and within each T group the isotropic magnetic shift decreases monotonically with increasing atomic number. The 45Sc nuclear electric quadrupolar coupling constants are generally well reproduced by quantum mechanical electric field gradient calculations using the WIEN2k code. 相似文献
7.
8.
E. Stiefel 《BIT Numerical Mathematics》1965,5(1):51-60
The main problem of celestial mechanics is to compute the movement of a point mass in space. The force entering the relevant differential equations can often be split into two parts, one of which can be considered as a small perturbation. This paper reviews some methods useful for the solution of such equations. Gröbner's non-linear method is briefly mentioned. Further, a regularization technique, appropriate for the perturbed Kepler problem, is discussed and compared with other methods. Finally, the treatment in the case of forced perturbations which are of interest for satellites, is briefly outlined.
This paper was presented at the NordSAM conference in Stockholm, Aug. 1964. 相似文献
This paper was presented at the NordSAM conference in Stockholm, Aug. 1964. 相似文献
9.
10.
Cremer Sauer Strubecker Walther Durand Kuntzmann Stiefel 《Zeitschrift für Angewandte Mathematik und Physik (ZAMP)》1957,8(5):425-427
Ohne Zusammenfassung 相似文献