首页 | 本学科首页   官方微博 | 高级检索  
文章检索
  按 检索   检索词:      
出版年份:   被引次数:   他引次数: 提示:输入*表示无穷大
  收费全文   25051篇
  免费   1192篇
  国内免费   4766篇
化学   28592篇
晶体学   298篇
力学   57篇
综合类   233篇
数学   29篇
物理学   1800篇
  2024年   28篇
  2023年   240篇
  2022年   595篇
  2021年   760篇
  2020年   772篇
  2019年   784篇
  2018年   662篇
  2017年   801篇
  2016年   959篇
  2015年   893篇
  2014年   1041篇
  2013年   2263篇
  2012年   1791篇
  2011年   1402篇
  2010年   1224篇
  2009年   1455篇
  2008年   1532篇
  2007年   1684篇
  2006年   1591篇
  2005年   1473篇
  2004年   1347篇
  2003年   1078篇
  2002年   939篇
  2001年   693篇
  2000年   674篇
  1999年   550篇
  1998年   448篇
  1997年   472篇
  1996年   428篇
  1995年   393篇
  1994年   340篇
  1993年   292篇
  1992年   280篇
  1991年   210篇
  1990年   159篇
  1989年   178篇
  1988年   125篇
  1987年   85篇
  1986年   61篇
  1985年   49篇
  1984年   56篇
  1983年   30篇
  1982年   42篇
  1981年   29篇
  1980年   23篇
  1979年   20篇
  1978年   22篇
  1977年   5篇
  1974年   5篇
  1973年   5篇
排序方式: 共有10000条查询结果,搜索用时 15 毫秒
41.
[3,3]-Sigmatropic rearrangements of allyl tetronates and allyl tetramates to give 3-allyltetronic or -tetramic acids, respectively, proceed within 20-60 min under microwave irradiation (300 W, 130-190 °C). Consecutive (homo)sigmatropic [1,5] H-shifts such as oxa-ene reactions are promoted less effectively, which allows the isolation of Claisen intermediates of sigmatropic domino sequences, in contrast to conventional heating.  相似文献   
42.
We studied simulations by computer graphics to estimate the steric mechanism of the asymmetric polymerization of prochiral diene monomers in channels of inclusion compounds of steroidal bile acids, such as deoxycholic acid (DCA) and cholic acid. We applied a hierarchization method to interpret the crystal structures of bile acids, clarifying that the chiral host molecules associated to form characteristic 21-helical assemblies with uneven surfaces. A detailed analysis of the uneven channels in a close-packing state indicated that there were many possible arrangements of the monomers in the channels. The plausible arrangements in the channel could explain a previous study, which showed that the polymerization in the DCA channel yielded chiral polymers with a predominant configuration from prochiral diene monomers, such as 2-methyl-trans-1,3-pentadiene. On the basis of such simulation studies of the arrangements of guest monomers in the channel, we examined a plausible steric mechanism for asymmetric inclusion polymerization. © 2004 Wiley Periodicals, Inc. J Polym Sci Part A: Polym Chem 42: 4648–4655, 2004  相似文献   
43.
1. INTRODUCTION Methionine, namely 2-amido-4-thiomethyl butyric acid with a structure of CH3SCH2CH2CHCOOH, is one of the essential amino acids and has two natural enantionmers, D and L-methionine. The mixture of L- and D-isomers can be used as analeptics or nutritive additives to maintain the equilibrium of amino acids of feed [1,2]. L-methionine can release active methyl and accelerate the synthesis of choline, which further speeds up the conversion of the lipid accumulated in liv…  相似文献   
44.
The polyacrylic acid functionalized polystyrene nanospheres were synthesized and self-assembled into irregular, densely packed monolayers in non-aqueous media. The polymer nanoparticles were chemically adhered to substrates. The morphologies of the resulting films were investigated. The impact of the volume fraction of alcohol in the mixed solvents on the particle adsorption and fabrication of nanosphere assembled films was examined.  相似文献   
45.
A facile solid phase synthesis of 2-substituted 1,3-oxazin-6-ones using polymer-supported Meldrum‘s acid has been reported. Reaction of the resin-bound cyclic malonic acid ester with triethyl orthoformate and subsequent double substitution with amide, afforded the corresponding polymer-supported acylaminomethylene cyclic malonic acid ester, which upon thermal treatment led to 1, 3-oxazin-6-ones in good yields and with high purity.  相似文献   
46.
Kinetic parameters of amino acid cations in an MK-40 ion-exchange membrane are calculated from the conductivity data. A theoretical quantum-chemical analysis of experimental activation energies for conduction suggests a mechanism of elementary act of transport of amino acid cations in the membrane.  相似文献   
47.
The stereoselective synthesis of E-rhinocerotinoic acid has been achieved in five steps from (−)-sclareol in an overall yield of 32%. This constitutes a significant improvement on the previous synthesis of this anti-inflammatory compound.  相似文献   
48.
The potential of an N-Troc-protected sialic acid donor, equipped with phenylsulfenyl functionality as a leaving group, has been explored. As a result, the entitled donor was proven to be highly reactive and to have broad applicability toward the synthesis of variant sialo-glycans, which have N-glycolyl, de-N-acetyl, 1,5-lactam and 8-O-sulfo sialic acid analogs.  相似文献   
49.
Ahn  In-Ae  Woong Kim  Sang  Ro  Seonggu 《Molecular diversity》1998,4(1):23-24
Peptides containing azaglycine located terminally or within the backbone have been prepared in the solid phase by means of an automatic synthesizer.  相似文献   
50.
脂肪乳剂Intralipid代谢产物的高效液相色谱测定   总被引:2,自引:0,他引:2  
夏立钧  吴海福 《分析化学》1994,22(8):759-762
本文介绍了利用HPLC色谱柱前衍生化技术简便,正确和灵敏地测定血清中游离脂肪酸的方法。在最佳条件下,一些脂肪酸的最低检知量为0.04μg。方法已用于脂肪乳剂Intralipid在诱发急性坏死性胰腺炎动物体内代谢产物测定。  相似文献   
设为首页 | 免责声明 | 关于勤云 | 加入收藏

Copyright©北京勤云科技发展有限公司  京ICP备09084417号