全文获取类型
收费全文 | 1002篇 |
免费 | 43篇 |
国内免费 | 6篇 |
专业分类
化学 | 788篇 |
晶体学 | 13篇 |
力学 | 7篇 |
数学 | 36篇 |
物理学 | 207篇 |
出版年
2023年 | 6篇 |
2022年 | 4篇 |
2021年 | 13篇 |
2020年 | 13篇 |
2019年 | 25篇 |
2018年 | 16篇 |
2017年 | 10篇 |
2016年 | 25篇 |
2015年 | 18篇 |
2014年 | 30篇 |
2013年 | 44篇 |
2012年 | 42篇 |
2011年 | 55篇 |
2010年 | 32篇 |
2009年 | 23篇 |
2008年 | 50篇 |
2007年 | 62篇 |
2006年 | 65篇 |
2005年 | 53篇 |
2004年 | 45篇 |
2003年 | 47篇 |
2002年 | 30篇 |
2001年 | 20篇 |
2000年 | 17篇 |
1999年 | 12篇 |
1998年 | 15篇 |
1997年 | 13篇 |
1996年 | 16篇 |
1995年 | 8篇 |
1994年 | 25篇 |
1993年 | 10篇 |
1992年 | 14篇 |
1991年 | 8篇 |
1990年 | 6篇 |
1989年 | 13篇 |
1987年 | 13篇 |
1986年 | 8篇 |
1985年 | 10篇 |
1984年 | 21篇 |
1983年 | 12篇 |
1982年 | 11篇 |
1981年 | 14篇 |
1980年 | 7篇 |
1979年 | 7篇 |
1978年 | 9篇 |
1977年 | 9篇 |
1976年 | 7篇 |
1973年 | 8篇 |
1968年 | 6篇 |
1967年 | 3篇 |
排序方式: 共有1051条查询结果,搜索用时 15 毫秒
61.
We propose and demonstrate generation of an in-phase optical pulse train from an optical beat signal. The proposed method is based on four-wave mixing occurring between the two continuous waves of the beat signal and on spectral filtering to shape the spectrum to be symmetric about the carrier frequency. We perform an experiment to verify the proposed method and obtain a 1.5 ps width in-phase pulse train from a 160 GHz beat signal. Furthermore, we employ a pulse compression scheme to reshape and compress the obtained pulse train, and we show that a 160 GHz repeating, 0.7 ps FWHM, nearly transform-limited, in-phase sech pulse train is successfully generated. 相似文献
62.
63.
Organic Dicarboxylate Negative Electrode Materials with Remarkably Small Strain for High‐Voltage Bipolar Batteries 下载免费PDF全文
Dr. Nobuhiro Ogihara Tomomi Yasuda Yoshihiro Kishida Dr. Tetsu Ohsuna Kaito Miyamoto Dr. Nobuko Ohba 《Angewandte Chemie (International ed. in English)》2014,53(43):11467-11472
As advanced negative electrodes for powerful and useful high‐voltage bipolar batteries, an intercalated metal–organic framework (iMOF), 2,6‐naphthalene dicarboxylate dilithium, is described which has an organic‐inorganic layered structure of π‐stacked naphthalene and tetrahedral LiO4 units. The material shows a reversible two‐electron‐transfer Li intercalation at a flat potential of 0.8 V with a small polarization. Detailed crystal structure analysis during Li intercalation shows the layered framework to be maintained and its volume change is only 0.33 %. The material possesses two‐dimensional pathways for efficient electron and Li+ transport formed by Li‐doped naphthalene packing and tetrahedral LiO3C network. A cell with a high potential operating LiNi0.5Mn1.5O4 spinel positive and the proposed negative electrodes exhibited favorable cycle performance (96 % capacity retention after 100 cycles), high specific energy (300 Wh kg?1), and high specific power (5 kW kg?1). An 8 V bipolar cell was also constructed by connecting only two cells in series. 相似文献
64.
Symmetrically functionalized pyrazine of 3,6‐dibromopyrazine‐2,5‐dicarbonitrile was synthesized in three or four steps from 3‐aminopyrazinecarbonitrile or its 6‐bromo derivatives. 相似文献
65.
66.
67.
68.
Nobuhiro ShionozakiToru Yamaguchi Hiroyuki KitanoMitsutaka Tomizawa Kimiko Makino Hiromi Uchiro 《Tetrahedron letters》2012,53(38):5167-5170
Total synthesis of an antitumor compound myceliothermophin A and related compounds based on a convergent synthetic strategy was investigated. A common decalin skeleton of myceliothermophins was stereoselectively constructed by an IMDA reaction. The fully elaborated precursor of myceliothermophins was obtained via aldol reaction of N-protected γ-methoxylactam with decalin aldehyde. By using Teoc group for the protection of nitrogen atom of lactam ring, selective deprotection prior to the hydrolysis of methoxyaminal moiety was successfully achieved to obtain γ-methoxylactams (myceliothermophins C and D). Subsequent hydrolysis of these compounds afforded the corresponding γ-hydroxylactam, and myceliothermophins A and B in high yield. Myceliothermophin E was also synthesized by dehydration of the obtained γ-hydroxylactams. The absolute configurations of myceliothermophins A-E were also successfully determined. 相似文献
69.
Yagi S Iwanaga T Kojima H Shoji Y Suzuki S Seno K Mori H Tokura Y Takigawa M Moriwaki S 《Photochemistry and photobiology》2002,76(6):669-671
We have developed a UV monitor with polycrystalline (poly-) gallium nitride (GaN) UV sensors and evaluated its performance from the viewpoint of its effectiveness for use with photosensitive dermatosis patients. The poly-GaN UV sensor is sensitive to UV light from 280 to 410 nm even without optical filters. The UV monitor is a portable self-data-acquisition instrument with a minimum detection level (defined as average UV intensity over 290 to 400 nm) of 2 microW/cm2 and can store UV dose data for 128 days. It allows easy measurement of four orders of magnitude of ambient UV intensity and dose from indoor light to direct solar radiation in summer. Trial use of the UV monitor by five xeroderma pigmentosum patients started in June 2000 and was carried out for 1 year. It was demonstrated that the UV monitor was useful in improving their quality of life. 相似文献
70.
[reaction: see text] Highly efficient syntheses of azabicyclo[4.4.0]alkane amino acids were achieved by Rh-catalyzed cyclohydrocarbonylation of dipeptides bearing a terminal olefin moiety and a heteroatom nucleophile. 相似文献