全文获取类型
收费全文 | 4488篇 |
免费 | 115篇 |
国内免费 | 20篇 |
专业分类
化学 | 3190篇 |
晶体学 | 46篇 |
力学 | 106篇 |
数学 | 217篇 |
物理学 | 1064篇 |
出版年
2022年 | 17篇 |
2021年 | 45篇 |
2020年 | 41篇 |
2019年 | 46篇 |
2018年 | 34篇 |
2017年 | 33篇 |
2016年 | 76篇 |
2015年 | 76篇 |
2014年 | 91篇 |
2013年 | 203篇 |
2012年 | 229篇 |
2011年 | 272篇 |
2010年 | 135篇 |
2009年 | 123篇 |
2008年 | 217篇 |
2007年 | 212篇 |
2006年 | 241篇 |
2005年 | 213篇 |
2004年 | 220篇 |
2003年 | 197篇 |
2002年 | 200篇 |
2001年 | 133篇 |
2000年 | 116篇 |
1999年 | 74篇 |
1998年 | 60篇 |
1997年 | 56篇 |
1996年 | 59篇 |
1995年 | 46篇 |
1994年 | 59篇 |
1993年 | 60篇 |
1992年 | 70篇 |
1991年 | 42篇 |
1990年 | 46篇 |
1989年 | 56篇 |
1988年 | 44篇 |
1987年 | 44篇 |
1986年 | 42篇 |
1985年 | 86篇 |
1984年 | 81篇 |
1983年 | 28篇 |
1982年 | 42篇 |
1981年 | 36篇 |
1980年 | 41篇 |
1979年 | 67篇 |
1978年 | 46篇 |
1977年 | 54篇 |
1976年 | 47篇 |
1975年 | 31篇 |
1974年 | 26篇 |
1973年 | 18篇 |
排序方式: 共有4623条查询结果,搜索用时 31 毫秒
991.
992.
993.
Fluctuating Carbonaceous Networks with a Persistent Molecular Shape: A Saddle‐Shaped Geodesic Framework of 1,3,5‐Trisubstituted Benzene (Phenine)
下载免费PDF全文
![点击此处可从《Angewandte Chemie (International ed. in English)》网站下载免费的PDF全文](/ch/ext_images/free.gif)
Dr. Koki Ikemoto Jennie Lin Ryo Kobayashi Dr. Sota Sato Prof. Dr. Hiroyuki Isobe 《Angewandte Chemie (International ed. in English)》2018,57(28):8555-8559
A saddle‐shaped macromolecule has been synthesized. The molecule was designed as a geodesic saddle with 1,3,5‐trisubstituted benzene (named phenine) as the fundamental unit. The phenines were woven into a polygonal framework that was composed of 168 sp2‐hybridized carbon atoms. The saddle‐shaped structure with unique symmetry showed atypical conformational changes. The biaryl linkages in this molecule had a small energy barrier for rotation, and these structural fluctuations resulted in seven 1H NMR resonances representing 84 aromatic hydrogen atoms. Nevertheless, the overall saddle shape of the molecule was persistent, and the “up” and “down” orientations of phenine moieties circulated to give average 1H resonances. The structural characteristics of this molecule, including the anomalous entropy‐driven dimerization, may deepen our understanding of defect‐rich graphitic sheets. 相似文献
994.
A Cell‐Targeted Non‐Cytotoxic Fluorescent Nanogel Thermometer Created with an Imidazolium‐Containing Cationic Radical Initiator
下载免费PDF全文
![点击此处可从《Angewandte Chemie (International ed. in English)》网站下载免费的PDF全文](/ch/ext_images/free.gif)
Dr. Seiichi Uchiyama Dr. Toshikazu Tsuji Kyoko Kawamoto Dr. Kentaro Okano Eiko Fukatsu Takahiro Noro Kumiko Ikado Sayuri Yamada Yuka Shibata Dr. Teruyuki Hayashi Dr. Noriko Inada Dr. Masaru Kato Dr. Hideki Koizumi Prof. Hidetoshi Tokuyama 《Angewandte Chemie (International ed. in English)》2018,57(19):5413-5417
A cationic fluorescent nanogel thermometer based on thermo‐responsive N‐isopropylacrylamide and environment‐sensitive benzothiadiazole was developed with a new azo compound bearing imidazolium rings as the first cationic radical initiator. This cationic fluorescent nanogel thermometer showed an excellent ability to enter live mammalian cells in a short incubation period (10 min), a high sensitivity to temperature variations in live cells (temperature resolution of 0.02–0.84 °C in the range 20–40 °C), and remarkable non‐cytotoxicity, which permitted ordinary cell proliferation and even differentiation of primary cultured cells. 相似文献
995.
996.
Matsuta K. Minamisono T. Tanigaki M. Fukuda M. Nojiri Y. Mihara M. Onishi T. Yamaguchi T. Harada A. Sasaki M. Miyake T. Minamisono K. Fukao T. Sato K. Matsumoto Y. Ohtsubo T. Fukuda S. Momota S. Yoshida K. Ozawa A. Kobayashi T. Tanihata I. Alonso J. R. Krebs G. F. Symons T. J. M. 《Hyperfine Interactions》1996,97(1):519-526
The magnetic moments of the proton drip-line nuclei13O(I
= 3/2–,T
1/2 = 8.6 ms) and 9C(I
= 3/2–,T
1/2 = 126 ms) have been determined for the first time through the combined techniques of polarized radioactive nuclear beams and-NMR detection. The observed magnetic moments are ¦(13O)¦ = 1.3891 ±0.0003
N and ¦(9C)¦ = 1.3914 ±0.0005
N. Spin expectation values are deduced to be 0.76 and 1.44 for13O and9C, respectively. While the of13O is consistent with the systematics from isospinT= 1/2 mirror pairs, the of9C is unusually large, even far larger than the single particle value, = 1. 相似文献
997.
998.
999.
1000.
Hisayoshi Kobayashi Masaru Yamaguchi Satohiro Yoshida 《Theoretical chemistry accounts》1982,60(5):391-398
A new method is presented to analyze the various interactions in reaction systems. The method is especially suited for large and strongly interacting systems where other analyzing methods are not practical. The method could isolate the particular interaction from the whole interaction by a procedure termed the partial diagonalization of the bond order matrix. The usefulness of the method is exemplified by the adsorption of CO on Pt and W surfaces. The interactions on the W surface are much stronger than those on the Pt surface, which is consistent with the experimental data. The role of individual interactions for the weakening of the C-O bond and the formation of the Pt-C and W-C bonds is discussed separately. 相似文献