全文获取类型
收费全文 | 272篇 |
免费 | 9篇 |
专业分类
化学 | 217篇 |
晶体学 | 1篇 |
力学 | 3篇 |
数学 | 12篇 |
物理学 | 48篇 |
出版年
2024年 | 1篇 |
2021年 | 2篇 |
2020年 | 5篇 |
2019年 | 3篇 |
2018年 | 1篇 |
2016年 | 3篇 |
2015年 | 1篇 |
2014年 | 9篇 |
2013年 | 15篇 |
2012年 | 12篇 |
2011年 | 20篇 |
2010年 | 6篇 |
2009年 | 10篇 |
2008年 | 14篇 |
2007年 | 12篇 |
2006年 | 12篇 |
2005年 | 20篇 |
2004年 | 19篇 |
2003年 | 9篇 |
2002年 | 16篇 |
2001年 | 3篇 |
2000年 | 5篇 |
1999年 | 1篇 |
1998年 | 1篇 |
1997年 | 2篇 |
1996年 | 8篇 |
1995年 | 17篇 |
1994年 | 4篇 |
1993年 | 3篇 |
1992年 | 2篇 |
1991年 | 4篇 |
1990年 | 3篇 |
1988年 | 1篇 |
1987年 | 3篇 |
1985年 | 4篇 |
1984年 | 2篇 |
1983年 | 1篇 |
1982年 | 2篇 |
1980年 | 2篇 |
1979年 | 4篇 |
1978年 | 2篇 |
1977年 | 2篇 |
1970年 | 3篇 |
1968年 | 2篇 |
1967年 | 1篇 |
1966年 | 5篇 |
1965年 | 2篇 |
1964年 | 1篇 |
1963年 | 1篇 |
排序方式: 共有281条查询结果,搜索用时 93 毫秒
91.
92.
93.
94.
95.
Sakai K Ishigami E Konno Y Kajiwara T Ito T 《Journal of the American Chemical Society》2002,124(41):12088-12089
The first/second examples of partially oxidized 1-D platinum chain compounds consisting of cationic dimer units have been obtained from electro-oxidation of an aqueous solution containing cis-[Pt(NH3)2(OH2)2]2+ and acetate/propionate. The analytical and crystallographic studies reveal the mixed-valency of Pt(2.2+)infinity. The XPS confirms the presence of both Pt(II) and Pt(III). The solid-state physical measurements reveal that they are diamagnetic semiconductors and display a fairly broad, low-energy absorption band in the range of 500-3200 nm. 相似文献
96.
Toshiyuki Osakai Naoki Akagi Hiroki Hotta Jie Ding Shigeo Sawada 《Journal of Electroanalytical Chemistry》2000,490(1-2)
The redox reaction between
-ascorbic acid in water and chloranil in nitrobenzene has been studied by means of polarography with an ascending water electrode as well as cyclic voltammetry with a stationary interface. Through accurate measurement of the limiting currents, it has been suggested that the redox reaction should be a two-electron reaction rather than a one-electron reaction described previously. A spectrophotometric technique has also been used to observe that the redox reaction proceeds spontaneously under certain conditions even without electrochemical control. Based on these findings, it has been concluded that the present heterogeneous charge transfer reaction is the ion transfer of chloranil semiquinone radical, which is driven by the homogeneous electron transfer between ascorbic acid and chloranil in the aqueous phase. 相似文献
97.
Fumiko Akagi Masaki MukohMasafumi Mochizuki Junko UshiyamaTakuya Matsumoto Harukazu Miyamoto 《Journal of magnetism and magnetic materials》2012,324(3):309-313
Thermally assisted magnetic recording (TAR) with bit-patterned media was investigated by micromagnetic simulation. The media were assumed to be FePt layers. The effective head-field margin as well as the increase in temperature margin and down-track shift margin was investigated. Conditions of the head and medium that lead to a recording density beyond 5 Tb/in2 were proposed. 相似文献
98.
Helically Assembled Pyrene Arrays on an RNA Duplex That Exhibit Circularly Polarized Luminescence with Excimer Formation 下载免费PDF全文
Dr. Mitsunobu Nakamura Junpei Suzuki Fuyuki Ota Dr. Tadao Takada Prof. Dr. Kazuo Akagi Prof. Dr. Kazushige Yamana 《Chemistry (Weinheim an der Bergstrasse, Germany)》2016,22(27):9121-9124
Circularly polarized luminescence (CPL) was observed in pyrene zipper arrays helically arranged on an RNA duplex. Hybridization of complementary RNA strands having multiple (two to five) 2′‐O‐pyrenylmethyl modified nucleosides affords an RNA duplex with normal thermal stability. The pyrene fluorophores are assembled like a zipper in a well‐defined helical manner along the axis of RNA duplex, which, upon 350 nm UV illumination, resulted in CPL emission with pyrene excimer formation. CPL (glum) levels observed for the pyrene arrays in dilute aqueous solution were +2×10?2–+3.5×10?2, which are comparable with |glum| for chiral organic molecules and related systems. The positive CPL signals are consistent with a right‐handed helical structure. Temperature dependence on CPL emission indicates that the stable rigid RNA structure is responsible for the strong CPL signals. The single pyrene‐modified RNA duplex did not show any CPL signal. 相似文献
99.
100.
We present a theoretical model of the behavior of a concentrated electrorheological fluid (ERF) which explicitly takes into account the effects of conductivity. The increase in shear viscosity under an electric field is due to a layered structure between the electrodes, made up of the remnants of particle chains adhering to the electrodes by electrostatic image forces, and a freely flowing liquid layer where all the shear flow is concentrated. This layered model can explain the variation of electric current with shear rate, as well as the rheological response of a dynamic yield stress proportional to the square of the applied electric field. 相似文献