全文获取类型
收费全文 | 7844篇 |
免费 | 202篇 |
专业分类
管理学 | 1125篇 |
民族学 | 32篇 |
人才学 | 1篇 |
人口学 | 721篇 |
丛书文集 | 33篇 |
理论方法论 | 698篇 |
综合类 | 283篇 |
社会学 | 3348篇 |
统计学 | 1805篇 |
出版年
2021年 | 52篇 |
2020年 | 90篇 |
2019年 | 129篇 |
2018年 | 167篇 |
2017年 | 244篇 |
2016年 | 199篇 |
2015年 | 149篇 |
2014年 | 175篇 |
2013年 | 1359篇 |
2012年 | 296篇 |
2011年 | 217篇 |
2010年 | 175篇 |
2009年 | 158篇 |
2008年 | 192篇 |
2007年 | 180篇 |
2006年 | 138篇 |
2005年 | 197篇 |
2004年 | 174篇 |
2003年 | 215篇 |
2002年 | 231篇 |
2001年 | 217篇 |
2000年 | 192篇 |
1999年 | 185篇 |
1998年 | 143篇 |
1997年 | 112篇 |
1996年 | 127篇 |
1995年 | 105篇 |
1994年 | 97篇 |
1993年 | 105篇 |
1992年 | 125篇 |
1991年 | 115篇 |
1990年 | 112篇 |
1989年 | 102篇 |
1988年 | 110篇 |
1987年 | 110篇 |
1986年 | 103篇 |
1985年 | 121篇 |
1984年 | 97篇 |
1983年 | 105篇 |
1982年 | 74篇 |
1981年 | 74篇 |
1980年 | 69篇 |
1979年 | 74篇 |
1978年 | 77篇 |
1977年 | 54篇 |
1976年 | 45篇 |
1975年 | 59篇 |
1974年 | 48篇 |
1973年 | 41篇 |
1972年 | 39篇 |
排序方式: 共有8046条查询结果,搜索用时 234 毫秒
691.
C. B. García J. García Pérez J. R. van Dorp 《Statistical Methods and Applications》2011,20(4):463-486
A prevalence of heavy-tailed, peaked and skewed uncertainty phenomena have been cited in literature dealing with economic,
physics, and engineering data. This fact has invigorated the search for continuous distributions of this nature. In this paper
we shall generalize the two-sided framework presented in Kotz and van Dorp (Beyond beta: other continuous families of distributions
with bounded support and applications. World Scientific Press, Singapore, 2004) for the construction of families of distributions with bounded support via a mixture technique utilizing two generating
densities instead of one. The family of Elevated Two-Sided Power (ETSP) distributions is studied as an instance of this generalized
framework. Through a moment ratio diagram comparison, we demonstrate that the ETSP family allows for a remarkable flexibility
when modeling heavy-tailed and peaked, but skewed, uncertainty phenomena. We shall demonstrate its applicability via an illustrative
example utilizing 2008 US income data. 相似文献
692.
David J. Weber M.D. David H. Tilley M.P.H. 《Journal of American college health : J of ACH》2013,61(4):193-194
Abstract Health science students, along with the health professionals they hope to become, are at increased risk for certain occupational injuries and illnesses. One of these risks is occupational exposure to blood-borne pathogens, such as human immunodeficiency virus (HIV) and hepatitis, which may result in severe illnesses or even death. Two case studies demonstrate postexposure care of exposed individuals at the University of Texas Medical Branch Student Health Services before and after policy changes and prevention strategies were strengthened in response to exposure incidents. 相似文献
693.
694.
695.
696.
697.
“毛泽东精神”研究四题 总被引:6,自引:1,他引:5
许全兴 《湖南科技大学学报(社会科学版)》2008,11(6):5-11
毛泽东思想体系具有层次性,毛泽东精神是毛泽东的智慧、情感、意志、理想、信念、人格的结晶,是毛泽东的思想、理论、诗词、书品、生活和实践中蕴含的最深层的本质。毛泽东精神是中华民族的民族精神在20世纪的集中体现,是振兴中华民族强大的精神动力。加强对毛泽东精神的研究、宣传和弘扬,是人民的呼声,时代的需要,是理论工作者责无旁贷的职责。 相似文献
698.
699.
The conclusions of alogically consistent economic theory which strictly adheres to Aristotle's axioms of logic are factually true if its sufficient conditions are all factually true. Alternatively, if a conclusion of such a theory is false, then at- least one of its assumptions is false. Unfortunately, the factual truth of sufficient conditions cannot be established because the problem of induction i s impossible t o solve. It is algo true that the falsity of a conclusion cannot be established in the presence of uncertainty. While the philosophy of instrumentalism applied to sufficient and logically consistent explanations may provide useful solutions to immediate practical problems, the principles of simplicity, parsimony and profligacy--all of them requiring conditional deductive arguments--are useless as criteria for model choice. 相似文献
700.
Piotr Fryzlewicz Véronique Delouille Guy P. Nason 《Journal of the Royal Statistical Society. Series C, Applied statistics》2007,56(1):99-116
Summary. We consider the stochastic mechanisms behind the data that were collected by the solar X-ray sensor (XRS) on board the GOES-8 satellite. We discover and justify a non-trivial mean–variance relationship within the XRS data. Transforming such data so that their variance is stable and its distribution is taken closer to the Gaussian distribution is the aim of many techniques (e.g. Anscombe and Box–Cox). Recently, new techniques based on the Haar–Fisz transform have been introduced that use a multiscale method to transform and stabilize data with a known mean–variance relationship. In many practical cases, such as the XRS data, the variance of the data can be assumed to increase with the mean, but other characteristics of the distribution are unknown. We introduce a method, the data-driven Haar–Fisz transform, which uses the Haar–Fisz transform but also estimates the mean–variance relationship. For known noise distributions, the data-driven Haar–Fisz transform is shown to be competitive with the fixed Haar–Fisz methods. We show how our data-driven Haar–Fisz transform method denoises the XRS series where other existing methods fail. 相似文献