全文获取类型
收费全文 | 376篇 |
免费 | 9篇 |
国内免费 | 4篇 |
专业分类
化学 | 316篇 |
晶体学 | 15篇 |
力学 | 8篇 |
数学 | 8篇 |
物理学 | 42篇 |
出版年
2022年 | 3篇 |
2021年 | 3篇 |
2020年 | 3篇 |
2019年 | 3篇 |
2018年 | 4篇 |
2017年 | 4篇 |
2016年 | 6篇 |
2015年 | 6篇 |
2014年 | 6篇 |
2013年 | 21篇 |
2012年 | 9篇 |
2011年 | 10篇 |
2010年 | 10篇 |
2009年 | 11篇 |
2008年 | 15篇 |
2007年 | 16篇 |
2006年 | 14篇 |
2005年 | 15篇 |
2004年 | 22篇 |
2003年 | 19篇 |
2002年 | 16篇 |
2001年 | 9篇 |
2000年 | 10篇 |
1999年 | 7篇 |
1998年 | 11篇 |
1997年 | 8篇 |
1996年 | 8篇 |
1995年 | 5篇 |
1994年 | 5篇 |
1993年 | 4篇 |
1992年 | 9篇 |
1991年 | 6篇 |
1990年 | 3篇 |
1989年 | 2篇 |
1988年 | 8篇 |
1987年 | 5篇 |
1986年 | 3篇 |
1985年 | 8篇 |
1984年 | 13篇 |
1983年 | 2篇 |
1982年 | 5篇 |
1981年 | 5篇 |
1980年 | 4篇 |
1979年 | 2篇 |
1978年 | 5篇 |
1977年 | 4篇 |
1976年 | 4篇 |
1975年 | 6篇 |
1974年 | 4篇 |
1928年 | 2篇 |
排序方式: 共有389条查询结果,搜索用时 15 毫秒
91.
92.
A novel polyhydroxy metabolite named Zooxanthellamide A, C128H222N2O54S2, was isolated from a cultured marine dinoflagellate, Symbiodinium sp., and the chemical structure was determined by spectroscopic methods. 相似文献
93.
Hisanori Yamane Shinya SasakiShun-ichi Kubota Ryo InoueMasahiko Shimada Takashi Kajiwara 《Journal of solid state chemistry》2002,163(2):449-454
Single crystals of the quaternary compound Ba8Cu3In4N5 were prepared by heating Ba, Cu, and In in a Na flux at 1023 K under 7 MPa of N2, and by slow cooling from this temperature. The crystal structure was analyzed by single-crystal X-ray diffraction. It crystallizes in an orthorhombic cell (space group Immm (No. 71), Z=2) with a=4.0781(6), b=12.588(2), and c=19.804(3) Å at 298 K. The structural formula is expressed as Ba8[CuN2]2 [CuN]In4. Nitridocuprates of one-dimensional chains 1∞[CuN2/2] and isolated units 0[CuN2], and one-dimensional indium clusters 1∞[In2In4/2] are contained in the structure. A split-site model applied for the arrangement of 1∞[CuN2/2] chains suggested that there is a short-bond, long-bond alternation of the Cu-N bondings. The electrical resistivity of Ba8Cu3In4N5 was 3.44 mΩ·cm at 298 K. A metallic temperature dependence of the resistivity was observed down to 10 K. 相似文献
94.
95.
96.
97.
Yoshimura I Miyahara Y Kasagi N Yamane H Ojida A Hamachi I 《Journal of the American Chemical Society》2004,126(39):12204-12205
This communication describes a new molecular recognition chip using a semi-wet microenvironment provided by a self-assembled hydrogel. On the basis of the evidence that the molecular recognition capability of artificial chemosensors are practically retained even in the hydrogel compared to those in aqueous solution, we miniaturized the functionalized hydrogel to produce an unprecedented molecular recognition chip. We believe that the present noncovalent immobilization method is generally applicable to many chemosensors, which leads to a unique semi-wet sensor chip suitable to convenient and high-throughput assay to plural analytes. 相似文献
98.
Keiichi Moriya Toshihiro Yamane Toshiya Suzuki Tsuyoshi Masuda Hiroshi Mizusaki Shinichi Yano 《Phosphorus, sulfur, and silicon and the related elements》2013,188(6-7):1427-1432
Cyclotriphosphazene and cyclotetraphosphazene derivatives with mesogenic 4-N-(4-alkoxyphenyl)iminomethyl)phenoxy and 4-(4'-alkoxy)biphenoxy moieties were synthesized. Schiff base moiety has higher mesomorphic stability than that in biphenyl moiety both in cyclotriphosphazene and cyclotetraphosphazene. Cyclotriphosphazenes possess higher thermal stability in the mesomorphic phase than the cyclotetraphosphazenes, suggesting the difference in the molecular structure. 相似文献
99.
100.
L. Anschütz W. Broeker H. Reihlen K. Th. Nestle A. Stock E. Pohland L. Schmid B. Becker C. Drucker C. Matignon B. Kubota T. Yamane R. Wright W. S. Ssadikow A. K. Michailow H. Jörg F. Pregl A. Rieche E. Fromm A. Friedrich G. v. Kozicki St. v. Pilat E. Gräfe H. J. Prins W. H. Chapin E. Berl F. Rau The Svedberg 《Analytical and bioanalytical chemistry》1928,73(11):417-425