全文获取类型
收费全文 | 18052篇 |
免费 | 2190篇 |
国内免费 | 1564篇 |
专业分类
化学 | 11550篇 |
晶体学 | 229篇 |
力学 | 834篇 |
综合类 | 151篇 |
数学 | 3036篇 |
物理学 | 6006篇 |
出版年
2023年 | 248篇 |
2022年 | 351篇 |
2021年 | 420篇 |
2020年 | 591篇 |
2019年 | 545篇 |
2018年 | 548篇 |
2017年 | 549篇 |
2016年 | 905篇 |
2015年 | 888篇 |
2014年 | 943篇 |
2013年 | 1543篇 |
2012年 | 1412篇 |
2011年 | 1526篇 |
2010年 | 1090篇 |
2009年 | 1021篇 |
2008年 | 1105篇 |
2007年 | 912篇 |
2006年 | 760篇 |
2005年 | 645篇 |
2004年 | 489篇 |
2003年 | 426篇 |
2002年 | 424篇 |
2001年 | 312篇 |
2000年 | 299篇 |
1999年 | 243篇 |
1998年 | 172篇 |
1997年 | 176篇 |
1996年 | 155篇 |
1995年 | 155篇 |
1994年 | 126篇 |
1993年 | 127篇 |
1992年 | 107篇 |
1991年 | 100篇 |
1990年 | 88篇 |
1989年 | 83篇 |
1988年 | 104篇 |
1987年 | 79篇 |
1986年 | 87篇 |
1985年 | 102篇 |
1984年 | 93篇 |
1983年 | 87篇 |
1982年 | 82篇 |
1981年 | 78篇 |
1980年 | 95篇 |
1979年 | 91篇 |
1978年 | 99篇 |
1977年 | 91篇 |
1976年 | 69篇 |
1974年 | 73篇 |
1973年 | 79篇 |
排序方式: 共有10000条查询结果,搜索用时 15 毫秒
61.
62.
63.
ChunXiaLI YingXiaLI LingBoYU HuaZHANG SiftDongCHU HuaShiGUAN 《中国化学快报》2003,14(8):776-778
A convenient synthetic route was developed for the synthesis of the novel glycolipids: 1,2-di-O-acyl-3-O-(2‘-acylamide-2‘-denxy-ct-D-glucopyranosyl)-sn-glycerols. 10 new compounds of glycolipids with different acyl groups were obtained. 相似文献
64.
65.
66.
The rate-dependent effects in metallic ferromagnetic materials with magnetization processes attributed to domain-walls motion were studied. The experimental method for eddy-current relaxation time determination was proposed. Some discrepancies between the data and theoretical predictions were observed and discussed. The origin of these discrepancies is accounted for by the decrease of viscous-type relaxation process as the rate of change of averaged magnetization is approaching zero. 相似文献
67.
The physico-chemical properties and reactivity tested by hydrogen reduction have been studied for two series of NiO-ZnO mixed oxides of various composition. The solid nickel oxide or zinc oxide in interaction with the solution of nitrate of the second component were used as the precursors in each series. The differences in some physico-chemical parameters of the samples in both series were correlated with their reduction behaviour, followed both in iso- and non-isothermal regime. Moreower, the influence of various factors modifying the reactivity of mixed oxides was also investigated and the results were compared with those obtained from earlier studied analogous systems of quite different origin.This revised version was published online in November 2005 with corrections to the Cover Date. 相似文献
68.
69.
70.
Július Korbaš 《Acta Mathematica Hungarica》2004,105(1-2):129-137
We prove new results about the vector field problem on the real flag manifolds O(n)/O(1) x O(1) x O(n - 2). For some infinite families of these manifolds, we completely solve the vector field problem. 相似文献