全文获取类型
收费全文 | 149篇 |
免费 | 0篇 |
专业分类
化学 | 117篇 |
晶体学 | 6篇 |
力学 | 1篇 |
数学 | 10篇 |
物理学 | 15篇 |
出版年
2022年 | 2篇 |
2020年 | 1篇 |
2019年 | 2篇 |
2018年 | 3篇 |
2017年 | 4篇 |
2016年 | 3篇 |
2015年 | 1篇 |
2014年 | 3篇 |
2013年 | 6篇 |
2011年 | 11篇 |
2010年 | 6篇 |
2009年 | 5篇 |
2008年 | 7篇 |
2007年 | 3篇 |
2006年 | 13篇 |
2005年 | 9篇 |
2004年 | 4篇 |
2003年 | 8篇 |
2002年 | 2篇 |
2001年 | 2篇 |
2000年 | 2篇 |
1999年 | 2篇 |
1998年 | 1篇 |
1997年 | 1篇 |
1996年 | 1篇 |
1994年 | 2篇 |
1993年 | 2篇 |
1992年 | 1篇 |
1991年 | 2篇 |
1990年 | 2篇 |
1986年 | 1篇 |
1982年 | 2篇 |
1981年 | 3篇 |
1979年 | 3篇 |
1978年 | 4篇 |
1976年 | 3篇 |
1975年 | 3篇 |
1974年 | 2篇 |
1973年 | 3篇 |
1972年 | 1篇 |
1971年 | 7篇 |
1970年 | 3篇 |
1969年 | 3篇 |
排序方式: 共有149条查询结果,搜索用时 15 毫秒
141.
I. N. Zyusin G. N. Nechiporenko N. I. Golovina R. F. Trofimova N. V. Loginova 《Russian Chemical Bulletin》1997,46(8):1421-1429
A series of di(NON-azoxy)formals and some relatedN-alkyl-N′-alkoxydiazeneN-oxides were prepared by the reaction ofN-nitrosohydroxylamine salts with dihaloalkanes. The dependence of the yield of di(methyl-NON-azoxy)formal on the reaction conditions and the nature of the cation was studied. The structure of di(methyl-NON-azoxy)formal and di(phenyl-NON-azoxy) formal as well as of the coppertert-butylnitrosohydroxylaminate was established by X-ray diffraction analysis.
Translated fromIzvestiya Akademii Nauk. Seriya Khimicheskaya, No. 8, pp. 1486–1493, August, 1997. 相似文献
142.
I. A. Nuretdinov N. A. Buina E. V. Bayandina É. I. Loginova M. A. Giniyatullina 《Russian Chemical Bulletin》1978,27(2):378-380
Conclusions We have prepared O-alkyl alkylphosphonoselenoic acids by reaction of O-alkyl alkylphosphonites with selenium in the presence of amines or alkali metals followed by acidification. We have shown by1H and31P NMR and IR spectroscopy that these acids and their salts exist in solution in the selenophosphoryl form.Translated from Izvestiya Akademii Nauk SSSR, Seriya Khimicheskaya., No. 2, pp. 437–440, February, 1978. 相似文献
143.
144.
A flexible and easy to implement method is proposed for computing the multipole-lens potential and field. It integrates conformal-mapping
technology and numerical approaches. A procedure for the sequential optimization of the geometric pole shape that is aimed
at improving the lens characteristics is described and demonstrated with examples. 相似文献
145.
The structure of pyrolytic manganese dioxide is analyzed by the method of total profiling of x-ray polycrystal patterns. Coordinates of atoms, temperature factors, unit cell periods of -MnO2, and filling coefficients of positions specifying the degree of stoichiometry are refined. It is established that the nonctoichiometry index is equal to 0.06(1). 相似文献
146.
147.
148.
Calculations are carried out for the compositions of the plasmas which are produced in closed cylindrical volumes filled with Xe, N2, O2, and CO2, with the radial temperature profile T(r) approximated by a step function. The redistribution of the plasma density is shown to be strongly influenced by the magnitude of the temperature drop and the ratio of the volumes of the regions at the two different temperatures. 相似文献
149.
N.V. Loginova T.V. Koval’chuk Y.V. FaletrovY.S. Halauko N.P. OsipovichG.I. Polozov R.A. ZheldakovaA.T. Gres A.S. HalaukoI.I. Azarko V.M. ShkumatovO.I. Shadyro 《Polyhedron》2011,30(15):2581-2591
The synthesis and physico-chemical characterization of Fe(II) and Mn(II) complexes of 2-[4,6-di(tert-butyl)-2,3-dihydroxyphenylsulfanyl]acetic acid (HLI) and 2-[4,6-di(tert-butyl)-2,3-dihydroxyphenylsulfinyl]acetic acid (HLII) were carried out. The investigation of the molecular and electronic structure of Cu(II), Ni(II), Zn(II), Fe(II) and Mn(II) complexes has been performed within the density functional theory (DFT) framework. The computed properties were compared to the experimental ones, and molecular structures of the compounds were proposed based on the array of spectral data and quantum chemical calculations. Antibacterial activity of the Fe(II) and Mn(II) complexes was evaluated in comparison with Cu(II), Co(II), Ni(II) and Zn(II) complexes and three standard antibiotics; it was found to follow the order: (1) Сu(LI)2 > Mn(LI)2 > HLI > Ni(LI)2 > Zn(LI)2 > Fe(LI)2 > Co(H2O)2LI; (2) Cu(LII)2 > Сo(LII)2 > Ni(LII)2 > Mn(H2O)2(LII)2 > Fe(LII)2 > HLII > Zn(LII)2; their reducing ability (determined electrochemically) followed the same order. Spectrophotometric investigation was carried out in order to estimate the rate of the reduction of bovine heart сytochrome c with the ligands and their metal(II) complexes. The complexes Сu(LI)2, Mn(LI)2 and Co(LII)2 with the high reducing ability were found to be characterized by the highest rates of Cyt с reduction. NADPH:cytochrome P450-reductase had no substantial effect on the rate of сytochrome c reduction with HLI and HLII ligands. 相似文献