全文获取类型
收费全文 | 11864篇 |
免费 | 320篇 |
国内免费 | 10篇 |
专业分类
管理学 | 1772篇 |
民族学 | 72篇 |
人才学 | 1篇 |
人口学 | 1054篇 |
丛书文集 | 54篇 |
理论方法论 | 1062篇 |
综合类 | 139篇 |
社会学 | 5312篇 |
统计学 | 2728篇 |
出版年
2023年 | 74篇 |
2021年 | 70篇 |
2020年 | 179篇 |
2019年 | 259篇 |
2018年 | 290篇 |
2017年 | 419篇 |
2016年 | 309篇 |
2015年 | 207篇 |
2014年 | 297篇 |
2013年 | 2189篇 |
2012年 | 368篇 |
2011年 | 354篇 |
2010年 | 274篇 |
2009年 | 288篇 |
2008年 | 315篇 |
2007年 | 308篇 |
2006年 | 315篇 |
2005年 | 310篇 |
2004年 | 283篇 |
2003年 | 255篇 |
2002年 | 298篇 |
2001年 | 302篇 |
2000年 | 276篇 |
1999年 | 275篇 |
1998年 | 205篇 |
1997年 | 205篇 |
1996年 | 189篇 |
1995年 | 144篇 |
1994年 | 202篇 |
1993年 | 155篇 |
1992年 | 182篇 |
1991年 | 184篇 |
1990年 | 172篇 |
1989年 | 156篇 |
1988年 | 136篇 |
1987年 | 139篇 |
1986年 | 126篇 |
1985年 | 134篇 |
1984年 | 147篇 |
1983年 | 124篇 |
1982年 | 120篇 |
1981年 | 113篇 |
1980年 | 100篇 |
1979年 | 88篇 |
1978年 | 74篇 |
1977年 | 82篇 |
1976年 | 73篇 |
1975年 | 66篇 |
1974年 | 52篇 |
1973年 | 50篇 |
排序方式: 共有10000条查询结果,搜索用时 31 毫秒
1.
In this article, we propose a novel approach for testing the equality of two log-normal populations using a computational approach test (CAT) that does not require explicit knowledge of the sampling distribution of the test statistic. Simulation studies demonstrate that the proposed approach can perform hypothesis testing with satisfying actual size even at small sample sizes. Overall, it is superior to other existing methods. Also, a CAT is proposed for testing about reliability of two log-normal populations when the means are the same. Simulations show that the actual size of this new approach is close to nominal level and better than the score test. At the end, the proposed methods are illustrated using two examples. 相似文献
2.
Pfeilstetter Richard 《Voluntas: International Journal of Voluntary and Nonprofit Organizations》2020,31(3):511-520
VOLUNTAS: International Journal of Voluntary and Nonprofit Organizations - This paper explores a network of organizations and their perspectives on the social enterprise commodity. Based on... 相似文献
3.
Cancho Vicente G. Macera Márcia A. C. Suzuki Adriano K. Louzada Francisco Zavaleta Katherine E. C. 《Lifetime data analysis》2020,26(2):221-244
Lifetime Data Analysis - Frailty models are generally used to model heterogeneity between the individuals. The distribution of the frailty variable is often assumed to be continuous. However, there... 相似文献
4.
5.
Open innovation and absorptive capacity are two concepts based on the idea that companies can leverage the knowledge generated externally to improve their innovation performance. The aim of this paper is to analyse the joint effect of open innovation and absorptive capacity on a firm's radical innovation. Open innovation is expressed in terms of external search breadth and depth strategies and absorptive capacity is described by distinguishing between potential and realized absorptive capacity. In order to test our hypotheses, we carried out empirical research in firms operating in high-technology industries. The results indicate that internal routines and processes for absorbing external knowledge help explain radical innovation as they show a significant effect of potential and realized absorptive capacity. Also, there is a moderating effect of absorptive capacity on open innovation. Specifically, potential absorptive capacity exerts a positive effect on the relationship between external search breadth and depth and radical innovation. Realized absorptive capacity moderates the influence of external search breadth. These findings confirm the complementary nature of absorptive capacity and open innovation search strategies on radical innovation. 相似文献
6.
Previous research has evaluated public risk perception and response to a natural hazards in various settings; however, most of these studies were conducted either with a single scenario or after a natural disaster struck. To better understand the dynamic relationships among affect, risk perception, and behavioral intentions related to natural disasters, the current study implements a simulation scenario with escalating weather intensity, and includes a natural experiment allowing comparison of public response before and after a severe tornado event with extensive coverage by the national media. The current study also manipulated the display of warning information, and investigated whether the warning system display format influences public response. Results indicate that (1) affect, risk perception, and behavioral intention escalated as weather conditions deteriorated, (2) responses at previous stages predicted responses at subsequent stages of storm progression, and (3) negative affect predicted risk perception. Moreover, risk perception and behavioral intention were heightened after exposure to the media coverage of an actual tornado disaster. However, the display format manipulation did not influence behavioral responses. The current study provides insight regarding public perception of predisaster warnings and the influence of exposure to media coverage of an actual disaster event. 相似文献
7.
8.
V. Conclusions The empirical evidence is strong that minimum wages have had little or no effect on poverty in the U.S. Indeed,
the evidence is stronger that minimum wages occasionally increase poverty. It also suggests that the minimum wage does not
even lower poverty for the one group that, almost by definition, one would expect to be helped: full-time, year-round workers.
While the empirical results suggest minimum wages do not achieve what is ostensibly their primary goal — relieving poverty
among the working poor — minimum wages do seem to impose a real cost on society in terms of lost income and output. The empirical
evidence on work hours suggests that a $1 increase in the minimum wage, far from being almost costless, could conceivably
impose income losses to American workers in the $12-15 billion range per year — an amount equal to the “income deficit” of
millions of persons counted as poor by the U.S. Bureau of the Census. 相似文献
9.
Thomas K. Kenemore 《Child and Adolescent Social Work Journal》2002,19(4):269-270
10.