全文获取类型
收费全文 | 235314篇 |
免费 | 5405篇 |
国内免费 | 4130篇 |
专业分类
化学 | 123325篇 |
晶体学 | 3629篇 |
力学 | 11668篇 |
综合类 | 258篇 |
数学 | 26988篇 |
物理学 | 78981篇 |
出版年
2022年 | 2282篇 |
2021年 | 3163篇 |
2020年 | 3457篇 |
2019年 | 3772篇 |
2018年 | 4141篇 |
2017年 | 4002篇 |
2016年 | 5617篇 |
2015年 | 3574篇 |
2014年 | 5437篇 |
2013年 | 10887篇 |
2012年 | 9388篇 |
2011年 | 10839篇 |
2010年 | 7821篇 |
2009年 | 7793篇 |
2008年 | 9546篇 |
2007年 | 9446篇 |
2006年 | 8855篇 |
2005年 | 7953篇 |
2004年 | 7309篇 |
2003年 | 6423篇 |
2002年 | 6402篇 |
2001年 | 6915篇 |
2000年 | 5345篇 |
1999年 | 4154篇 |
1998年 | 3529篇 |
1997年 | 3369篇 |
1996年 | 3181篇 |
1995年 | 2914篇 |
1994年 | 2874篇 |
1993年 | 2691篇 |
1992年 | 2900篇 |
1991年 | 2971篇 |
1990年 | 2864篇 |
1989年 | 2631篇 |
1988年 | 2627篇 |
1987年 | 2572篇 |
1986年 | 2469篇 |
1985年 | 2997篇 |
1984年 | 3195篇 |
1983年 | 2699篇 |
1982年 | 2810篇 |
1981年 | 2728篇 |
1980年 | 2594篇 |
1979年 | 2722篇 |
1978年 | 2804篇 |
1977年 | 2787篇 |
1976年 | 2933篇 |
1975年 | 2681篇 |
1974年 | 2691篇 |
1973年 | 2831篇 |
排序方式: 共有10000条查询结果,搜索用时 15 毫秒
91.
Kalinin A. A. Sharipova S. M. Islamova L. N. Fazleeva G. M. Busyurova D. N. Sharipova A. V. Fominykh O. D. Balakina M. Yu. 《Russian Chemical Bulletin》2022,71(5):1009-1018
Russian Chemical Bulletin - Two new D—π—A chromophores with the tricyanofuranyl acceptor (A), an amphi-divinyl quinoxaline π-electron conjugated bridge, and the carbazole or... 相似文献
92.
Potapov I. D. Voznarskiy A. Yu. Mironov A. V. Motyakin M. V. Nekipelova T. D. Podrugina T. A. 《Russian Chemical Bulletin》2022,71(5):1027-1033
Russian Chemical Bulletin - A new approach to the synthesis of λ5-phosphinolines was developed consisting in the reaction of mixed phosphonium-iodonium ylides with acetylenes in the presence... 相似文献
93.
The recent development of selective oxidation of aromatic sulfides with molecular oxygen was highlighted. The sulfoxides and sulfones could be obtained by simply switching the reaction media, i.e., bis(2-butoxyethyl)ether (BBE) or poly(ethylene glycol)dimethyl ether (PEGDME). The application of the high-boiling-point polyether as an initiator and green media can eliminate the need of large quantities of additives and volatile solvents. This strategy represents an economic and eco-friendly method that could find potential applications. 相似文献
94.
Ukhin L. Yu. Kuz’mina L. G. Alexeenko D. V. Belousova L. V. Gribanova T. N. Morkovnik A. S. Shepelenko E. N. Borodkin G. S. Dmitrieva O. I. Podshibyakin V. A. 《Russian Chemical Bulletin》2021,70(7):1368-1376
Russian Chemical Bulletin - New potential biologically active derivatives, in which the sterically hindered pyrocatechol moiety is linked through a 2-thioacetyl covalent bridge to a number of... 相似文献
95.
Dyachenko I. V. Dyachenko V. D. Dorovatovskii P. V. Khrustalev V. N. Nenajdenko V. G. 《Russian Chemical Bulletin》2021,70(11):2145-2155
Russian Chemical Bulletin - The tandem Knoevenagel—Michael—intramolecular ammonolysis—alkylation reaction was used to synthesize functionalized tetrahydropyridones. The molecular... 相似文献
96.
Novakov I. A. Sheikin D. S. Ruchko E. A. Brunilina L. L. Vernigora A. A. Salykin N. A. Vostrikova O. V. Chapurkin V. V. Nawrozkij M. B. Kurkin D. V. Bakulin D. A. Vorontsov M. Yu. Sablina L. A. Kovalev N. S. Tyurenkov I. N. 《Russian Chemical Bulletin》2021,70(11):2220-2226
Russian Chemical Bulletin - Novel structural analogs of isothiobarbamine, which differ from the prototype scaffold by the substituent at position 2 of the pyrimidine heterocycle, were for the first... 相似文献
97.
Specific features of coupling reactions of polystyrene in the presence α-dinitrones based on glyoxal
Kolyakina E. V. Shoipova F. H. Alyeva A. B. Grishin D. F. 《Russian Chemical Bulletin》2021,70(9):1736-1745
Russian Chemical Bulletin - Bromine-containing polystyrene synthesized by atom transfer radical polymerization was used as a model to study coupling reactions in the presence of such free radical... 相似文献
98.
Russian Chemical Bulletin - A synthetic approach to the modification of the drug Edaravone with pharmacoactive moieties of adamantane, carbazole, tetrahydrocarbazole, and γ-carboline was... 相似文献
99.
Colloid Journal - The influence of the concentration and size of magnetite nanoparticles on the stability of highly concentrated water-in-oil emulsions containing styrene–divinylbenzene... 相似文献
100.
Dvornikova I. A. Buravlev E. V. Shevchenko O. G. Chukicheva I. Yu. Kutchin A. V. 《Russian Chemical Bulletin》2021,70(11):2185-2188
Some new derivatives based on 2,6-diisobornylphenol and containing amine moieties of the pinane structure at the para-position relative to the phenolic hydroxy group were synthesized. The antioxidant properties of the obtained compounds were estimated using various in vitro models. The introduction of diamine moiety into a starting molecule led to a significant increase in the radical scavenging activity and the ability to chelate Fe2+ ions.
相似文献