全文获取类型
收费全文 | 23229篇 |
免费 | 2495篇 |
国内免费 | 2413篇 |
专业分类
化学 | 3145篇 |
晶体学 | 43篇 |
力学 | 2736篇 |
综合类 | 578篇 |
数学 | 14677篇 |
物理学 | 6958篇 |
出版年
2024年 | 30篇 |
2023年 | 187篇 |
2022年 | 304篇 |
2021年 | 478篇 |
2020年 | 513篇 |
2019年 | 503篇 |
2018年 | 524篇 |
2017年 | 716篇 |
2016年 | 867篇 |
2015年 | 638篇 |
2014年 | 1181篇 |
2013年 | 1493篇 |
2012年 | 1213篇 |
2011年 | 1450篇 |
2010年 | 1296篇 |
2009年 | 1584篇 |
2008年 | 1554篇 |
2007年 | 1625篇 |
2006年 | 1464篇 |
2005年 | 1391篇 |
2004年 | 1168篇 |
2003年 | 1045篇 |
2002年 | 881篇 |
2001年 | 807篇 |
2000年 | 731篇 |
1999年 | 643篇 |
1998年 | 583篇 |
1997年 | 544篇 |
1996年 | 400篇 |
1995年 | 341篇 |
1994年 | 287篇 |
1993年 | 205篇 |
1992年 | 175篇 |
1991年 | 147篇 |
1990年 | 158篇 |
1989年 | 105篇 |
1988年 | 106篇 |
1987年 | 92篇 |
1986年 | 79篇 |
1985年 | 95篇 |
1984年 | 78篇 |
1983年 | 47篇 |
1982年 | 74篇 |
1981年 | 61篇 |
1980年 | 42篇 |
1979年 | 44篇 |
1978年 | 38篇 |
1977年 | 30篇 |
1976年 | 32篇 |
1973年 | 23篇 |
排序方式: 共有10000条查询结果,搜索用时 62 毫秒
81.
82.
R. Norvaisa 《Lithuanian Mathematical Journal》2005,45(4):447-457
We give a characterization of Gaussian chaos laws on Banach function spaces which do not contain ℓ
∞
n
's uniformly. The result is applied to describe the convergence in law of U-processes with sample paths in certain Banach function spaces.
__________
Published in Lietuvos Matematikos Rinkinys, Vol. 45, No. 4, pp. 553–566, October–December, 2005. 相似文献
83.
Mean value in invexity analysis 总被引:1,自引:0,他引:1
In this paper, a generalization of the mean value theorem is considered in the case of functions defined on an invex set with respect to η (which is not necessarily connected). 相似文献
84.
具有避难所的非自治竞争系统的持续生存和全局稳定性 总被引:2,自引:0,他引:2
考虑一个四缀块模型,其中一缀块里有三个竞争种群,另外三个分别是它们的避难所,并且种群能在竞争缀块和各自的避难所间相互扩散.在一定的条件下,我们给出了此模型的持续生存,周期性和全局稳定性. 相似文献
85.
Two groups of 10 speech-language pathology graduate students were each given 7 weeks of singing lessons to determine whether voice lessons could have an effect on their clinical and perceptual skills. Pre-, mid-, and posttests to measure various skills were designed and implemented. With use of paired sample statistical testing, statistically significant results were obtained. In addition, the subjective responses of the students show that the lessons were effective in improving pitch perception, breath control, and legato production or easy onset. This study supports efforts to integrate curricula in vocal performance and speech-language pathology. 相似文献
86.
87.
In [5] Phillips proved that one can obtain the additive group of any nonstandard model *? of the ring ? of integers by using a linear mod 1 function h : F ?, where F is the α-dimensional vector space over ? when α is the cardinality of *?. In this connection it arises the question whether there are linear mod 1 functions which are neither addition nor quasi-linear. We prove that this is the case. 相似文献
88.
Asymptotic chi-squared test statistics for testing the equality of moment vectors are developed. The test statistics proposed are generalized Wald test statistics that specialize for different settings by inserting an appropriate asymptotic variance matrix of sample moments. Scaled test statistics are also considered for dealing with nonstandard conditions. The specialization will be carried out for testing the equality of multinomial populations, and the equality of variance and correlation matrices for both normal and nonnormal data. When testing the equality of correlation matrices, a scaled version of the normal theory chi-squared statistic is proven to be an asymptotically exact chi-squared statistic in the case of elliptical data. 相似文献
89.
SINGULARBOUNDARYPROPERTIESOFHARMONICFUNCTIONSANDFRACTALANALYSISWENZHIYINGZHANGYIPINGManuscriptreceivedJanuary11,1995.Revi... 相似文献
90.