全文获取类型
收费全文 | 277篇 |
免费 | 18篇 |
国内免费 | 20篇 |
专业分类
化学 | 158篇 |
晶体学 | 2篇 |
力学 | 8篇 |
数学 | 28篇 |
物理学 | 119篇 |
出版年
2023年 | 2篇 |
2022年 | 11篇 |
2021年 | 10篇 |
2019年 | 6篇 |
2018年 | 3篇 |
2017年 | 4篇 |
2016年 | 7篇 |
2015年 | 2篇 |
2014年 | 2篇 |
2013年 | 13篇 |
2012年 | 16篇 |
2011年 | 14篇 |
2010年 | 5篇 |
2009年 | 10篇 |
2008年 | 8篇 |
2007年 | 5篇 |
2006年 | 6篇 |
2005年 | 8篇 |
2004年 | 7篇 |
2003年 | 11篇 |
2002年 | 12篇 |
2001年 | 10篇 |
2000年 | 12篇 |
1999年 | 6篇 |
1998年 | 4篇 |
1997年 | 4篇 |
1996年 | 7篇 |
1995年 | 16篇 |
1994年 | 7篇 |
1993年 | 5篇 |
1992年 | 3篇 |
1991年 | 9篇 |
1990年 | 5篇 |
1989年 | 5篇 |
1988年 | 3篇 |
1986年 | 2篇 |
1985年 | 4篇 |
1984年 | 2篇 |
1983年 | 3篇 |
1982年 | 5篇 |
1981年 | 2篇 |
1980年 | 2篇 |
1979年 | 3篇 |
1978年 | 4篇 |
1977年 | 5篇 |
1976年 | 2篇 |
1975年 | 4篇 |
1973年 | 5篇 |
1964年 | 2篇 |
1957年 | 3篇 |
排序方式: 共有315条查询结果,搜索用时 8 毫秒
91.
92.
In the present work a new graphical method is described to represent the resultant of the multiply reflected waves from coating
systems consisting of single and double layers on metallic substrate, taking into account the optical phase properties of
the films. 相似文献
93.
The eigenvalues of the pure quartic oscillator bounded by infinitely high potentials are studied. Compact recursion relations for the power series coefficients of the odd and the even wave functions are obtained which allow numerical values of the eigenvalues to be computed via an iteration scheme. 相似文献
94.
95.
H. Flaschka und M. F. Barakat 《Fresenius' Journal of Analytical Chemistry》1957,156(5):321-326
Ohne Zusammenfassung 相似文献
96.
Summary The quantitative paper chromatographic in-situ determination of amino acids in mixtures, using a single-standard sample as the reference, is described. By using a single standard, quantitative two dimensional analyses of complex mixtures became feasible and the efficiency of one dimensional analyses was increased. The proposed methods are particularly helpful in routine analyses specially in those carried out under fixed experimental conditions. 相似文献
97.
The φ meson productions in Au+Au and/or Pb+Pb collisions at AGS, SPS,
RHIC, and LHC energies have been studied systematically with a hadron and
string cascade model LUCIAE. After considering the energy dependence of the
model parameter α in string fragmentation function and adjusting it
to the experimental data of charged multiplicity to a certain extent,
the model predictions for φ meson yield, rapidity, and
transverse mass distributions are compatible with the experimental data at
AGS, SPS and RHIC energies. A calculation for Pb+Pb collisions at LHC energy
is given as well. The obtained fractional variable in string fragmentation
function shows a saturation in energy dependence. It is discussed that the
saturation of fractional variable in string fragmentation function might be a
qualitative representation of the energy dependence of nuclear transparency. 相似文献
98.
The energy and centrality dependencies of charged particle pseudorapidity density in relativistic nuclearcollisions were studied using a hadron and string cascade model, JPCIAE. Both the relativistic p+p experimental dataand the PHOBOS and PHENIX Au+Au data at RHIC energy could be fairly reproduced within the framework ofJPCIAE model and without retuning the model parameters. The predictions for Pb + Pb collisions at the LHC energywere also given. We computed the participant nucleon distributions using different methods. It was found that thenumber of participant nucleons is not a well defined variable both experimentally and theoretically. Thus it may beinappropriate to use the charged particle pseudorapidity density per participant pair .as a function of the number ofparticipant nucleons for distinguishing various theoretical models. 相似文献
99.
100.