全文获取类型
收费全文 | 336篇 |
免费 | 15篇 |
专业分类
化学 | 219篇 |
力学 | 1篇 |
数学 | 48篇 |
物理学 | 83篇 |
出版年
2022年 | 2篇 |
2021年 | 6篇 |
2020年 | 6篇 |
2019年 | 4篇 |
2017年 | 5篇 |
2016年 | 21篇 |
2015年 | 13篇 |
2014年 | 13篇 |
2013年 | 14篇 |
2012年 | 25篇 |
2011年 | 24篇 |
2010年 | 8篇 |
2009年 | 15篇 |
2008年 | 17篇 |
2007年 | 25篇 |
2006年 | 20篇 |
2005年 | 20篇 |
2004年 | 7篇 |
2003年 | 9篇 |
2002年 | 20篇 |
2001年 | 4篇 |
2000年 | 5篇 |
1999年 | 5篇 |
1997年 | 2篇 |
1996年 | 4篇 |
1995年 | 3篇 |
1994年 | 4篇 |
1990年 | 2篇 |
1986年 | 2篇 |
1985年 | 3篇 |
1981年 | 2篇 |
1979年 | 2篇 |
1978年 | 2篇 |
1973年 | 2篇 |
1972年 | 2篇 |
1958年 | 1篇 |
1955年 | 2篇 |
1954年 | 1篇 |
1947年 | 1篇 |
1940年 | 1篇 |
1939年 | 1篇 |
1936年 | 2篇 |
1934年 | 1篇 |
1933年 | 2篇 |
1929年 | 1篇 |
1927年 | 1篇 |
1925年 | 2篇 |
1924年 | 2篇 |
1923年 | 1篇 |
1922年 | 1篇 |
排序方式: 共有351条查询结果,搜索用时 46 毫秒
91.
92.
93.
A high performance liquid chromatography (HPLC) system complemented with T-split, capillary detection cell and a high voltage power supply was used for peptide mapping by gradient electrochromatography and nanoliquid chromatography (nano-LC). With capillary columns of 100 microm ID, 6 cm packed with octadecylated 1.5 microm silica particles, the typical analysis time was approximately 10-15 min. The resolution of a tryptic digest of cytochrome c obtained by electrochromatography at 100 kV/m was superior compared to the analysis by nano-LC. Bubble formation caused by Joule heating at currents up to 100 microA was successfully suppressed by using a resistor capillary of 25 microm ID connected to the outlet of the packed column. 相似文献
94.
Multivariate statistical assessment of polluted soils 总被引:9,自引:0,他引:9
Vasil Simeonov Juergen Einax Stafan Tsakovski Joerg Kraft 《Central European Journal of Chemistry》2005,3(1):1-9
This study deals with the application of several multivariate statistical methods (cluster analysis, principal components
analysis, multiple regression on absolute principal components scores) for assessment of soil pollution by heavy metals. The
sampling was performed in a heavily polluted region and the chemometric analysis revealed four latent factors, which describe
84.5 % of the total variance of the system, responsible for the data structure. These factors, whose identity was proved also
by cluster analysis, were conditionally named “ore specific”, “metal industrial”, “cement industrial”, and “steel production”
factors. Further, the contribution of each identified factor to the total pollution of the soil by each metal pollutant in
consideration was determined. 相似文献
95.
Nicolas Soldermann Joerg Velker Olivier Vallat Helen Stoeckli‐Evans Reinhard Neier 《Helvetica chimica acta》2000,83(9):2266-2276
The novel tandem process Diels‐Alder reaction/Ireland‐Claisen rearrangement shows a high diastereoselectivity for the Ireland‐Claisen rearrangement starting from the endo‐product of the Diels‐Alder reaction. Based on this mechanistic knowledge, the novel tandem process could be applied to the synthesis of rac‐juvabione. 相似文献
96.
97.
98.
99.
Ties Behnke 《Pramana》2007,69(5):697-702
In preparation of the experimental program at the international linear collider (ILC), the large detector concept (LDC) is
being developed. The main points of the LDC are a large volume gaseous tracking system, combined with high precision vertex
detector and an extremely granular calorimeter. The main design force behind the LDC is the particle flow concept.
for the LDC Concept Group 相似文献
100.
Dorin Bucur Eduard Feireisl Šárka Ne?asová Joerg Wolf 《Journal of Differential Equations》2008,244(11):2890-2908
We study the asymptotic behavior of solutions to the incompressible Navier-Stokes system considered on a sequence of spatial domains, whose boundaries exhibit fast oscillations with amplitude and characteristic wave length proportional to a small parameter. Imposing the complete slip boundary conditions we show that in the asymptotic limit the fluid sticks completely to the boundary provided the oscillations are non-degenerate, meaning not oriented in a single direction. 相似文献