全文获取类型
收费全文 | 366篇 |
免费 | 0篇 |
专业分类
化学 | 294篇 |
晶体学 | 1篇 |
数学 | 15篇 |
物理学 | 56篇 |
出版年
2022年 | 5篇 |
2021年 | 7篇 |
2020年 | 8篇 |
2019年 | 5篇 |
2018年 | 8篇 |
2017年 | 9篇 |
2016年 | 15篇 |
2015年 | 3篇 |
2014年 | 16篇 |
2013年 | 34篇 |
2012年 | 13篇 |
2011年 | 25篇 |
2010年 | 12篇 |
2009年 | 14篇 |
2008年 | 14篇 |
2007年 | 12篇 |
2006年 | 19篇 |
2005年 | 9篇 |
2004年 | 9篇 |
2003年 | 4篇 |
2002年 | 13篇 |
2001年 | 6篇 |
2000年 | 3篇 |
1997年 | 2篇 |
1996年 | 5篇 |
1995年 | 2篇 |
1994年 | 3篇 |
1993年 | 7篇 |
1992年 | 2篇 |
1991年 | 7篇 |
1990年 | 3篇 |
1989年 | 4篇 |
1988年 | 5篇 |
1987年 | 3篇 |
1985年 | 3篇 |
1983年 | 2篇 |
1980年 | 2篇 |
1979年 | 3篇 |
1978年 | 5篇 |
1977年 | 6篇 |
1976年 | 7篇 |
1975年 | 3篇 |
1974年 | 7篇 |
1973年 | 2篇 |
1972年 | 2篇 |
1971年 | 4篇 |
1970年 | 4篇 |
1963年 | 1篇 |
1962年 | 1篇 |
1961年 | 1篇 |
排序方式: 共有366条查询结果,搜索用时 0 毫秒
1.
V. M. Ogenko A. V. Fesenko N. D. Konovalova V. I. Stepanenko 《Reaction Kinetics and Catalysis Letters》1993,50(1-2):169-173
It has been established that CO oxidation with excess O2 on Ni/Al2O3 forms an inhomogeneous NiO contact surface that smoothes critical effects in the sharp reactivity change. 相似文献
2.
A. P. Avdeenko S. A. Konovalova O. N. Ludchenko 《Russian Journal of Organic Chemistry》2006,42(5):683-688
Reactions of halogens with N-arylsulfonyl-1,4-benzoquinone monoimines occur with the formation of a halogenonium ion that either transforms into a carbocation where the first halogen atom adds to the carbon in the ortho-position relative to the carbonyl carbon, or the halogenonium ion adds directly the second halogen atom. 相似文献
3.
B. M. Dzhagarov N. N. Kruk N. V. Konovalova A. A. Solodunov I. I. Stepuro 《Journal of Applied Spectroscopy》1995,62(2):285-289
Presented at the XV IUPAC Symposium on Photochemistry, Prague, July 17–22, 1994. 相似文献
4.
E. N. Chebotok V. Yu. Novikov I. N. Konovalova 《Russian Journal of Applied Chemistry》2006,79(7):1162-1166
Depolymerization of chitin and chitosan in the course of deacetylation in an alkaline medium was studied, and the influence exerted on the process by the nature and concentration of the alkali (NaOH, KOH) and salts (NaCl, NaI, KI) was examined. 相似文献
5.
Mironov V. F. Ivkova G. A. Burnaeva L. M. Konovalova I. V. Musin R. Z. 《Russian Journal of General Chemistry》2003,73(9):1367-1370
The reaction of pyruvonitrile with 2-tetrafluoropropoxy-5,6-benzo-1,3,2-dioxaphosphorinan-4-one results mainly in the enlargement of the starting heteroring to form 4-cyano-4-methyl-2-tetrafluoropropoxy-6,7-benzo-1,3,25-dioxaphosphepin-5-one 2-oxide as a mixture of two diastereomers (14:1) along with minor amounts of 3-cyano-3-methyl-2-tetrafluoropropoxy-6,7-benzo-1,4,25-dioxaphosphepin-5-one 2-oxide. 相似文献
6.
V. G. Kharchenko S. N. Chalaya T. M. Konovalova 《Chemistry of Heterocyclic Compounds》1975,11(2):125-136
The literature data touching upon the synthesis of thiapyrylium salts and the stability of the thiapyrylium cation as compared with its isoelectronic analogs, as well as the nucleophilic, oxidation, anion-exchange, and other reactions of the salts with substituted and unsubstituted thiapyrylium cations are examined in this review. 相似文献
7.
A. V. Redkina Yu. V. Belokopytov N. D. Konovalova K. N. Khomenko 《Theoretical and Experimental Chemistry》2007,43(6):405-410
An increase in the propylene output in the oxidative dehydration of propane on V2O5/TiO2-SiO2 was observed after prior reduction of V2O5 in the reaction mixture to V2O4, which reduces the destructive chemisorption of propylene. A low titanium dioxide content in TiO2-SiO2 hinders the deep reduction of V2O5 to V2O3, which reduces the conversion of propane.
__________
Translated from Teoreticheskaya i éksperimental’naya Khimiya, Vol. 43, No. 6, pp. 373–378, November–December, 2007. 相似文献
8.
9.
O. A. Konovalova K. S. Rybalko V. I. Sheichenko D. A. Pakaln 《Chemistry of Natural Compounds》1974,7(6):719-721
Conclusions 1. Two sesquiterpene lactones have been isolated from the epigeal green part ofArtemisia caucasica Willd.: one with the composition C15H18O5·H2O, which has been called grossmisin, and one with the composition C15H18O5, identified as rutifolin. Structure (I) has been proposed for grossmisin.2. The structure of anhydroaustricin has been reviewed. Structure (II) is proposed for it.Pyatigorsk Pharmaceutical Institute. All-Union Scientific-Research Institute for Medicinal Plants. Translated from Khimiya Prirodnykh Soedinenii, No. 6, pp. 741–744, November–December, 1971. 相似文献
10.