全文获取类型
收费全文 | 3624篇 |
免费 | 101篇 |
国内免费 | 11篇 |
专业分类
化学 | 2759篇 |
晶体学 | 45篇 |
力学 | 45篇 |
数学 | 171篇 |
物理学 | 716篇 |
出版年
2022年 | 18篇 |
2021年 | 23篇 |
2020年 | 48篇 |
2019年 | 61篇 |
2018年 | 41篇 |
2017年 | 25篇 |
2016年 | 71篇 |
2015年 | 58篇 |
2014年 | 83篇 |
2013年 | 171篇 |
2012年 | 179篇 |
2011年 | 210篇 |
2010年 | 120篇 |
2009年 | 106篇 |
2008年 | 190篇 |
2007年 | 183篇 |
2006年 | 191篇 |
2005年 | 195篇 |
2004年 | 144篇 |
2003年 | 161篇 |
2002年 | 156篇 |
2001年 | 90篇 |
2000年 | 95篇 |
1999年 | 55篇 |
1998年 | 40篇 |
1997年 | 48篇 |
1996年 | 50篇 |
1995年 | 30篇 |
1994年 | 38篇 |
1993年 | 43篇 |
1992年 | 45篇 |
1991年 | 47篇 |
1990年 | 50篇 |
1989年 | 35篇 |
1988年 | 47篇 |
1987年 | 44篇 |
1986年 | 35篇 |
1985年 | 68篇 |
1984年 | 50篇 |
1983年 | 26篇 |
1982年 | 36篇 |
1981年 | 39篇 |
1980年 | 27篇 |
1979年 | 35篇 |
1978年 | 35篇 |
1977年 | 42篇 |
1976年 | 33篇 |
1975年 | 23篇 |
1974年 | 17篇 |
1973年 | 24篇 |
排序方式: 共有3736条查询结果,搜索用时 31 毫秒
191.
Daisuke Saito Dr. Tomasz Galica Prof. Dr. Eiji Nishibori Dr. Masaki Yoshida Dr. Atsushi Kobayashi Prof. Dr. Masako Kato 《Chemistry (Weinheim an der Bergstrasse, Germany)》2022,28(32):e202200703
The vapochromic single-crystal-to-single-crystal (SCSC) transformation of a highly luminescent PtII complex bearing an N-heterocyclic carbene [Pt(CN)2(tBu-impy)] (tBu-impyH+=1-tert-butyl-3-(2-pyridyl)-1H-imidazolium) is reported. The trihydrate form of the complex, which exhibits blue 3MMLCT emission owing to weak Pt⋅⋅⋅Pt interactions, changed its luminescence color from blue to yellowish-green upon the desorption of water molecules while keeping the high emission quantum yield of more than 0.45. Variable-temperature and continuous in-situ tracking of single-crystal X-ray diffraction measurements revealed that the SCSC transformation proceeds reversibly by the release and reabsorption of water molecules, thereby changing the stacked structure slightly. As a result, the dynamics of vapor-induced SCSC transformation were elucidated: that the anhydrous form returned to the original trihydrate form in a two-step process under a water vapor atmosphere. In addition, the PtII complex exhibited a similar SCSC response accompanied by a luminescence color change in the presence of methanol vapor, while being inactive toward ethanol vapor. 相似文献
192.
193.
Shotaro Yoshida Kensuke Sumomozawa Kuniaki Nagamine Matsuhiko Nishizawa 《Macromolecular bioscience》2019,19(6)
A hydrogel‐based microchamber with organic electrodes for efficient electrical stimulations of human induced pluripotent stem cell‐derived cardiomyocytes (hiPSC‐CMs) is described. The microchamber is made from molecularly permeable, optically transparent, and electrically conductive polyvinyl alcohol (PVA) hydrogel and highly capacitive carbon electrode modified with poly(3,4‐ethylenedioxythiophene) (PEDOT). Spheroids of hiPSC‐CMs are cultured in microchambers, and electrically stimulated by the electrode for maturation. The large interfacial capacitance of the electrodes enables several days of electrical stimulation without generation of cytotoxic bubbles even when the electrodes are placed near the spheroids. The spheroids can be cultivated in the closed microchambers because of the permeated nutrients through the hydrogel, thus the spheroids are stably addressable and the culture medium around the sealed microchambers can be simply exchanged. Synchronized beating of the spheroids can be optically analyzed in situ, which makes it possible to selectively collect electrically responsive cells for further use. As the hydrogel is electrically conductive, the amount of electrical charge needed for maturing the spheroids can be reduced by configuring electrodes on the top and the bottom of the microchamber. The bioreactor will be useful for efficient production of matured hiPSC‐CMs for regenerative medicine and drug screening. 相似文献
194.
Ciprian A. Tudor Nakahiro Yoshida 《Stochastic Processes and their Applications》2019,129(9):3499-3526
We develop the asymptotic expansion theory for vector-valued sequences of random variables in terms of the convergence of the Stein–Malliavin matrix associated with the sequence . Our approach combines the classical Fourier approach and the recent Stein–Malliavin theory. We find the second order term of the asymptotic expansion of the density of and we illustrate our results by several examples. 相似文献
195.
Fujiko Iwasaki Hideyuki Nishiyama Noriko Manabe Masanori Yasui Noboru Matsumura 《Phosphorus, sulfur, and silicon and the related elements》2013,188(1):429-430
Abstract Novel metal-carbene complexes (4) with a metallapentalene framework have been obtained from hypervalent diazadiselenathiapentalenes (3) by treating with Pt(PPh3)4, Pd(PPh3)4 and RhCl(PPh3)3. X-Ray investigations revealed that the central hypervalent sulfur atom in 3 was substituted by a metal atom to form M-Se bonds in the resultant metallapentalene framework. 相似文献
196.
197.
Tatsuya Kikuchi Masumi Yoshida Shiki Matsuura Shungo Natsui Etsuji Tsuji Hiroki Habazaki Ryosuke O. Suzuki 《Journal of Physics and Chemistry of Solids》2014
Micro-, submicron-, and nano-scale titanium dioxide particles were reduced by reduction with a metallic calcium reductant in calcium chloride molten salt at 1173 K, and the reduction mechanism of the oxides by the calcium reductant was explored. These oxide particles, metallic calcium as a reducing agent, and calcium chloride as a molten salt were placed in a titanium crucible and heated under an argon atmosphere. Titanium dioxide was reduced to metallic titanium through a calcium titanate and lower titanium oxide, and the materials were sintered together to form a micro-porous titanium structure in molten salt at high temperature. The reduction rate of titanium dioxide was observed to increase with decreasing particle size; accordingly, the residual oxygen content in the reduced titanium decreases. The obtained micro-porous titanium appeared dark gray in color because of its low surface reflection. Micro-porous metallic titanium with a low oxygen content (0.42 wt%) and a large surface area (1.794 m2 g−1) can be successfully obtained by reduction under optimal conditions. 相似文献
198.
Reassessment of the NH4NO3 thermal decomposition technique for calibration of the N2O isotopic composition 下载免费PDF全文
199.
Mitsuaki Yoshida 《Proceedings of the Japan Academy. Series B, Physical and biological sciences》2010,86(2):117-130
Molecular biology of mouse and chicken retroviruses had identified oncogenes and provided a revolutionary concept in understanding of cancers. A human retrovirus was established during 1980–1982 in linkage with a unique human leukemia, concurrently in Japan and USA. This review covers our efforts on the discovery of new retrovirus, Human T-cell Leukemia Virus Type 1 (HTLV-1), first introducing to a new class of retroviruses with a unique regulatory factors, Tax and Rex. Then it is followed by analyses of molecular interaction of the vial Tax with cellular machineries involved in the pathogenesis of Adult T-cell Leukemia (ATL). And then a probable mechanism of pathogenesis of ATL is proposed including recent findings on HBZ after our efforts. 相似文献
200.
Satoshi Someya Satoshi Yoshida Koji Okamoto Yan Rong Li Manabu Tange Mohammad Mezbah Uddin 《显形杂志》2010,13(1):41-47