全文获取类型
收费全文 | 9215篇 |
免费 | 178篇 |
国内免费 | 20篇 |
专业分类
化学 | 5744篇 |
晶体学 | 143篇 |
力学 | 198篇 |
数学 | 1325篇 |
物理学 | 2003篇 |
出版年
2020年 | 84篇 |
2019年 | 80篇 |
2016年 | 156篇 |
2015年 | 130篇 |
2014年 | 152篇 |
2013年 | 287篇 |
2012年 | 292篇 |
2011年 | 374篇 |
2010年 | 219篇 |
2009年 | 210篇 |
2008年 | 314篇 |
2007年 | 296篇 |
2006年 | 318篇 |
2005年 | 281篇 |
2004年 | 291篇 |
2003年 | 256篇 |
2002年 | 236篇 |
2001年 | 168篇 |
2000年 | 212篇 |
1999年 | 137篇 |
1998年 | 129篇 |
1997年 | 122篇 |
1996年 | 157篇 |
1995年 | 174篇 |
1994年 | 151篇 |
1993年 | 132篇 |
1992年 | 138篇 |
1991年 | 127篇 |
1990年 | 122篇 |
1989年 | 140篇 |
1988年 | 146篇 |
1987年 | 126篇 |
1986年 | 123篇 |
1985年 | 151篇 |
1984年 | 109篇 |
1983年 | 143篇 |
1982年 | 145篇 |
1981年 | 153篇 |
1980年 | 129篇 |
1979年 | 153篇 |
1978年 | 135篇 |
1977年 | 119篇 |
1976年 | 111篇 |
1975年 | 91篇 |
1974年 | 105篇 |
1973年 | 109篇 |
1972年 | 65篇 |
1971年 | 80篇 |
1970年 | 66篇 |
1968年 | 65篇 |
排序方式: 共有9413条查询结果,搜索用时 20 毫秒
11.
12.
Werner WinterGünther W.H Höhne 《Thermochimica Acta》2003,403(1):43-53
A method for measuring heat capacities of small samples using a chip-calorimeter and a heat pulse technique is described. The theoretical background to calculate the heat transport properties and the heat capacity of the sample from the pulse response function is given. Problems and potentials of the method are discussed. An example is given. 相似文献
13.
Klaus Anderle Richard Birenheide Martin J. A. Werner Joachim H. Wendorff 《Liquid crystals》1991,9(5):691-699
Polarized light leads to an effective reorientation of the optic axis in the glassy state of liquid-crystalline side chain polymers containing azobenzene mesogenic groups, via a trans-cis and cis-trans isomerization. Using a combination of U V and IR dichroitic studies it is shown for copolymers consisting of chromophores (azobenzene) and non-chromophores (phenylbenzoate) that only the chromophores are reoriented by light as far as the glassy state is concerned. Individual chromophores are thus addressed by photoselection. Photoselection in the fluid nematic state, on the other hand, leads also to a reorientation of the non-chromophores. 相似文献
14.
15.
16.
An improved method including extraction procedures is presented for the analysis of nucleotides in suspension-cultivated animal cells. Quantification was performed by ion-pair high-performance liquid chromatography after perchloric acid extraction. It was found that the amount of perchloric acid taken for extraction influenced the yield and that cell washing procedures caused deterioration of the analysis results for triphosphates. More than thirty nucleotides and sugar-nucleotides were separated within 25 min using a Supelcosil reversed-phase column (3 microns) with tetrabutylammonium hydrogensulphate as pairing agent and methanol-pH gradient elution. Cultivated hybridoma cells showed variations in intracellular nucleotide concentrations as well as relative amounts during different growth phases, which could reflect the physiological state of a cell culture. 相似文献
17.
Hyperfine Interactions - The YFe4Al8 and ErFe4Al8 intermetallics were studied by57Fe Mössbauer spectroscopy between 2 K and room temperature. The spectra are consistent with iron occupying 8f... 相似文献
18.
Kaon production is studied within the Giessen Boltzmann–Uehling–Uhlenbeck (GiBUU) model. Results are compared with experiment and with other models. The influence of the kaon potential on the kaon azimuthal distributions at SIS energies is considered. We also discuss the role of the many-body collisions at high-density phase of reaction. 相似文献
19.
Wolfgang Werner 《Fresenius' Journal of Analytical Chemistry》1987,328(6):500-501
20.