全文获取类型
收费全文 | 1322篇 |
免费 | 28篇 |
国内免费 | 3篇 |
专业分类
化学 | 887篇 |
晶体学 | 12篇 |
力学 | 12篇 |
数学 | 92篇 |
物理学 | 350篇 |
出版年
2021年 | 11篇 |
2019年 | 17篇 |
2018年 | 19篇 |
2016年 | 14篇 |
2015年 | 21篇 |
2014年 | 21篇 |
2013年 | 54篇 |
2012年 | 50篇 |
2011年 | 51篇 |
2010年 | 36篇 |
2009年 | 42篇 |
2008年 | 55篇 |
2007年 | 51篇 |
2006年 | 49篇 |
2005年 | 61篇 |
2004年 | 51篇 |
2003年 | 47篇 |
2002年 | 44篇 |
2001年 | 27篇 |
2000年 | 18篇 |
1999年 | 21篇 |
1998年 | 17篇 |
1997年 | 15篇 |
1996年 | 16篇 |
1995年 | 15篇 |
1994年 | 26篇 |
1993年 | 20篇 |
1992年 | 29篇 |
1991年 | 19篇 |
1990年 | 11篇 |
1989年 | 16篇 |
1988年 | 18篇 |
1987年 | 16篇 |
1986年 | 18篇 |
1985年 | 16篇 |
1984年 | 28篇 |
1983年 | 17篇 |
1982年 | 21篇 |
1981年 | 20篇 |
1980年 | 15篇 |
1979年 | 26篇 |
1978年 | 10篇 |
1977年 | 18篇 |
1976年 | 19篇 |
1975年 | 23篇 |
1974年 | 20篇 |
1973年 | 18篇 |
1972年 | 18篇 |
1971年 | 10篇 |
1965年 | 12篇 |
排序方式: 共有1353条查询结果,搜索用时 109 毫秒
1.
2.
3.
4.
Dr. Yogesh Kumar Maurya Dr. Pingchun Wei Takahide Shimada Dr. Kazuhisa Yamasumi Dr. Shigeki Mori Prof. Dr. Ko Furukawa Dr. Hajime Kusaba Prof. Dr. Tatsumi Ishihara Prof. Dr. Yongshu Xie Dr. Masatoshi Ishida Prof. Dr. Hiroyuki Furuta 《化学:亚洲杂志》2021,16(7):743-747
A facile synthetic strategy towards conformationally stable chiral chromophores based on dimeric porphyrinoids has been established. A peculiar class of face-to-face intramolecularly interlocked corrole dimers were formed by the oxidative C−C coupling linked at the inner carbon sites upon simple treatment of copper(II) ions. Their intrinsic electronic structures were modulated by the peripheral corrole ring annulations, which lead to distinct optical properties and redox profiles. The stereogenic carbon centers implemented in the confused corrole skeleton provided a rationale for designing novel chiral materials. 相似文献
5.
Total Synthesis and Biological Evaluation of the Antibiotic Lysocin E and Its Enantiomeric,Epimeric, and N‐Demethylated Analogues 下载免费PDF全文
Dr. Motoki Murai Takuya Kaji Dr. Takefumi Kuranaga Dr. Hiroshi Hamamoto Prof. Dr. Kazuhisa Sekimizu Prof. Dr. Masayuki Inoue 《Angewandte Chemie (International ed. in English)》2015,54(5):1556-1560
Lysocin E, a macrocyclic peptide, exhibits potent antibacterial activity against methicillin‐resistant Staphylococcus aureus (MRSA) through a novel mechanism. The first total synthesis of lysocin E was achieved by applying a full solid‐phase strategy. The developed approach also provides rapid access to the enantiomeric, epimeric, and N‐demethylated analogues of lysocin E. Significantly, the antibacterial activity of the unnatural enantiomer was comparable to that of the natural isomer, suggesting the absence of chiral recognition in its mode of action. 相似文献
6.
Supramolecular Polyelectrolyte Complexes of Bone Morphogenetic Protein‐2 with Sulfonated Polyrotaxanes to Induce Enhanced Osteogenic Differentiation 下载免费PDF全文
7.
Optical Review - A measured color speckle distribution around a white point plotted in the xyYnorm color space was compared with the color speckle distribution calculated by the conventional... 相似文献
8.
Sho Inagaki Akari Sato Haruka Sato Satoru Tamura Tomikazu Kawano 《Tetrahedron letters》2017,58(52):4872-4875
A simple and efficient synthesis of 4,5-dihydro-4-oxo-3-furancarboxylates using an acylative intramolecular cyclization of sulfonium salts is described. The reaction involved the efficient formation of a mixed anhydride between a linear carboxylic acid and trifluoroacetic anhydride in the presence of N-methylimidazole, followed by the sequential conversion into a highly reactive acylammonium species in situ. This procedure is easily handled, uses readily available inexpensive reagents, and provides a variety of 2-substituted 4,5-dihydro-4-oxo-3-furancarboxylates. 相似文献
9.
Solubility of several anthraquinone derivatives in supercritical carbon dioxide was readily available in the literature, but correcting ability of the existing models was poor. Therefore, in this work, two new models have been developed for better correlation based on solid–liquid phase equilibria. The new model has five adjustable parameters correlating the solubility isotherms as a function of temperature. The accuracy of the proposed models was evaluated by correlating 25 binary systems. The proposed models observed provide the best overall correlations. The overall deviation between the experimental and the correlated results was less than 11.46% in averaged absolute relative deviation (AARD). Moreover, exiting solubility models were also evaluated for all the compounds for the comparison purpose. 相似文献
10.
M. Sugawara E. Tamura Y. Satoh Y. Komatsu M. Tago H. Beer 《Heat and Mass Transfer》2007,43(10):1009-1018
Visual observations reveal a complicated flow in the liquid melt and a melting front configuration resulting from horizontal
ice plate melting from above into a 20 wt% calcium chloride aqueous solution. The initial temperature of the ice plate and
the mixture are both −5°C. Small scale “mountain and valley” structures (∼1 mm) appear on the flat melting front just after
melting begins, which have been called “sharkskin”. Innumerable upward and downward flows appear near the sharkskin and are controlled by its “mountain and valley” structure. These typical flows will considerably promote the melting of the
ice plate to be 30% larger as compared to the numerically predicted results assuming a flat melting front (i.e., without the
sharkskin), and also by three times larger compared with the results for melting from below. 相似文献