全文获取类型
收费全文 | 251篇 |
免费 | 5篇 |
专业分类
化学 | 184篇 |
晶体学 | 3篇 |
力学 | 17篇 |
数学 | 22篇 |
物理学 | 30篇 |
出版年
2022年 | 2篇 |
2020年 | 2篇 |
2019年 | 5篇 |
2018年 | 5篇 |
2017年 | 4篇 |
2016年 | 8篇 |
2015年 | 4篇 |
2014年 | 9篇 |
2013年 | 14篇 |
2012年 | 16篇 |
2011年 | 18篇 |
2010年 | 14篇 |
2009年 | 6篇 |
2008年 | 19篇 |
2007年 | 12篇 |
2006年 | 5篇 |
2005年 | 11篇 |
2004年 | 6篇 |
2003年 | 6篇 |
2002年 | 8篇 |
2001年 | 2篇 |
2000年 | 2篇 |
1999年 | 2篇 |
1998年 | 2篇 |
1997年 | 4篇 |
1995年 | 4篇 |
1994年 | 6篇 |
1993年 | 5篇 |
1992年 | 12篇 |
1991年 | 3篇 |
1990年 | 3篇 |
1989年 | 3篇 |
1988年 | 3篇 |
1987年 | 2篇 |
1986年 | 2篇 |
1984年 | 2篇 |
1983年 | 2篇 |
1982年 | 3篇 |
1981年 | 2篇 |
1980年 | 1篇 |
1979年 | 1篇 |
1977年 | 2篇 |
1975年 | 2篇 |
1974年 | 2篇 |
1973年 | 1篇 |
1972年 | 1篇 |
1970年 | 1篇 |
1968年 | 1篇 |
1956年 | 2篇 |
1884年 | 1篇 |
排序方式: 共有256条查询结果,搜索用时 0 毫秒
251.
Alexander A. Kodentsov Frans J. J. van Loo 《Monatshefte für Chemie / Chemical Monthly》2012,22(3):1309-1314
Abstract
The isothermal cross section through the ternary phase diagram Nb–Ni–Cr at 1,100 °C was constructed by means of diffusion couples and equilibrated alloys. It was found that nearly 28 at.% of Cr can be dissolved in the μ phase (Nb7Ni6) at this temperature, and the solubility of chromium in NbNi3 is approximately 5 at.%. Under these circumstances the low-temperature (cubic) modification of the NbCr2 Laves phase can dissolve up to 6 at.% of nickel, but further increase of the Ni content (up to approximately 10 at.%) stabilizes the hexagonal (high-temperature) modification of the Laves phase. The presence of this pseudo-ternary compound which is in equilibrium with all binary intermetallics and body-centred cubic (BCC) Nb- and Cr-based solid solutions largely determines the topology of the isotherm at 1,100 °C. The formation of this phase was also observed in the reaction zone between Nb and Ni–Cr solid solution when chromium concentration exceeded 15 at.%. 相似文献252.
Capillary-electrophoresis methods are attracting interest owing to the ability to yield rapid high-resolution separations, but many aspects, such as sample injection, separation conditions and detection, need further development. Effects related to sample injection and buffer composition have been investigated. Automated methods for electromigration injection of nl-size sample volumes are shown to give a precision of approximately +/-1%. Problems encountered with manual injection procedures have been examined by an electric field reversal technique. The effect of buffer pH on capillary zone-electrophoresis (CZE) separations can be attributed to changes in electro-osmotic flow velocities and to changes in the isoelectric points of analytes. The interfacing of capillary electrophoresis with mass spectrometry is described and demonstrated for a range of conditions, with a quaternary phosphonium salt mixture. Separations obtained by CZE and capillary isotachophoresis are compared and the relative advantages of the two techniques discussed. 相似文献
253.
254.
255.
Transitional Metal/Chalcogen Dependant Interactions of Hairpin DNA with Transition Metal Dichalcogenides,MX2 下载免费PDF全文
Adeline Huiling Loo Alessandra Bonanni Prof. Zdenek Sofer Prof. Martin Pumera 《Chemphyschem》2015,16(11):2304-2306
Owing to the attractive properties that transition metal dichalcogenides (TMDs) display, they have found recent application in the fabrication of biosensing devices. These devices involve the immobilization of a recognition element such as DNA onto the surface of TMDs. Therefore, it is imperative to examine the interactions between TMDs and DNA. Herein, we explore the effect of different transition metals (Mo and W) and chalcogens (S and Se) on the interactions between hairpin DNA and TMDs of both bulk and t‐BuLi exfoliated forms. We discovered that the interactions are strongly dependent on the metal/chalcogen composition in TMDs. 相似文献
256.