全文获取类型
收费全文 | 7269篇 |
免费 | 212篇 |
国内免费 | 20篇 |
专业分类
化学 | 4345篇 |
晶体学 | 55篇 |
力学 | 134篇 |
数学 | 1230篇 |
物理学 | 1737篇 |
出版年
2023年 | 62篇 |
2022年 | 111篇 |
2021年 | 156篇 |
2020年 | 129篇 |
2019年 | 154篇 |
2018年 | 152篇 |
2017年 | 135篇 |
2016年 | 260篇 |
2015年 | 232篇 |
2014年 | 269篇 |
2013年 | 550篇 |
2012年 | 338篇 |
2011年 | 380篇 |
2010年 | 270篇 |
2009年 | 250篇 |
2008年 | 302篇 |
2007年 | 265篇 |
2006年 | 307篇 |
2005年 | 238篇 |
2004年 | 203篇 |
2003年 | 170篇 |
2002年 | 161篇 |
2001年 | 107篇 |
2000年 | 112篇 |
1999年 | 76篇 |
1998年 | 81篇 |
1997年 | 70篇 |
1996年 | 65篇 |
1995年 | 64篇 |
1994年 | 63篇 |
1993年 | 71篇 |
1992年 | 48篇 |
1991年 | 65篇 |
1990年 | 52篇 |
1988年 | 60篇 |
1987年 | 54篇 |
1986年 | 55篇 |
1985年 | 77篇 |
1984年 | 85篇 |
1983年 | 57篇 |
1982年 | 53篇 |
1981年 | 60篇 |
1980年 | 63篇 |
1979年 | 65篇 |
1978年 | 65篇 |
1977年 | 76篇 |
1976年 | 60篇 |
1975年 | 61篇 |
1974年 | 73篇 |
1973年 | 49篇 |
排序方式: 共有7501条查询结果,搜索用时 0 毫秒
1.
2.
A protocol to correct for intra‐ and interspecific variation in tail hair growth to align isotope signatures of segmentally cut tail hair to a common time line 下载免费PDF全文
3.
4.
5.
Palladium and molybdenum polycrystalline layers (clusters) have been deposited in a stainless steel UHV system onto a layer of alumina (Al2O3). This layer has been prepared by high temperature oxidation of an aluminium layer. The interaction of this system with nitrogen has been investigated at room temperature by an FEM technique. Under these conditions nitrogen spillover from molybdenum to palladium has been observed. 相似文献
6.
V. Balek T. Mitsuhashi I.M. Bountseva H. Haneda Z. Malek J. Šubrt 《Journal of Sol-Gel Science and Technology》2003,26(1-3):185-189
The diffusion structural analysis (DSA) was used to characterize microstructure changes of hydrous titania gel films under in situ conditions of heating. TG and DTA were used in order to elucidate the processes controlling the formation of anatase film during heating of hydrous titania gel film. The annealing of porosity and near surface structure defects of the dehydrated titania films was indicated by DSA in the temperature range 255–700°C as the decrease of radon release rate. It was demonstrated that the annealing was enhanced on heating in oxygen in comparison with heating in argon. The DSA experimental results were compared with model curves describing the radon diffusion mobility and the annealing of radon diffusion paths. 相似文献
7.
Ivan Pan 《Comptes Rendus Mathematique》2005,341(7):439-443
We show that the first dynamical degree of a Cremona transformation stabilizing an irrational non elliptic curve is 1. Moreover, among these transformations, we characterize those which have finite order. To cite this article: I. Pan, C. R. Acad. Sci. Paris, Ser. I 341 (2005). 相似文献
8.
Ivan Vitev 《Acta Physica Hungarica A》2006,27(2-3):281-286
We present an analytic model of jet quenching, based on the (D)GLV energy loss formalism, to describe the system size dependence of QGP-induced parton absorption in relativistic heavy ion collisions. Numerical simulations of the transverse momentum dependence of jet quenching are given for central Au+Au and Cu+Cu reactions. Low p Tdijet correlations are shown to be sensitive to the reappearance of the lost energy as soft hadrons. At high p Twe find that the attenuation of dihadrons is similar to that of single inclusive particles. Comparison to recent data from PHENIX and STAR is given as a test of the jet quenching theory. 相似文献
9.
Peter Šimon 《Journal of Thermal Analysis and Calorimetry》2006,83(3):521-522
This
issue of Journal of Thermal Analysis and Calorimetry contains selected papers
based on presentations in the field of thermal characteristics of advanced
polymer systems presented at the 8th International
Symposium on Polymers for Advanced Technologies (PAT 2005) held in Budapest,
September 2005.
Guest Editors 相似文献
10.
Ivan Kojadinovic 《4OR: A Quarterly Journal of Operations Research》2007,5(2):117-142
The application of multi-attribute utility theory based on the Choquet integral requires the prior identification of a capacity
if the utility scale is unipolar, or of a bi-capacity if the utility scale is bipolar. In order to implement a minimum distance
principle for capacity or bi-capacity approximation or identification, quadratic distances between capacities and bi-capacities
are studied. The proposed approach, consisting in solving a strictly convex quadratic program, has been implemented within
the GNU R kappalab package for capacity and nonadditive integral manipulation. Its application is illustrated on two examples.
相似文献