全文获取类型
收费全文 | 13744篇 |
免费 | 399篇 |
国内免费 | 3篇 |
专业分类
管理学 | 1933篇 |
民族学 | 80篇 |
人才学 | 4篇 |
人口学 | 1185篇 |
丛书文集 | 95篇 |
理论方法论 | 1432篇 |
综合类 | 247篇 |
社会学 | 7194篇 |
统计学 | 1976篇 |
出版年
2021年 | 65篇 |
2020年 | 190篇 |
2019年 | 304篇 |
2018年 | 327篇 |
2017年 | 455篇 |
2016年 | 340篇 |
2015年 | 256篇 |
2014年 | 320篇 |
2013年 | 2268篇 |
2012年 | 447篇 |
2011年 | 424篇 |
2010年 | 344篇 |
2009年 | 340篇 |
2008年 | 347篇 |
2007年 | 383篇 |
2006年 | 353篇 |
2005年 | 364篇 |
2004年 | 344篇 |
2003年 | 273篇 |
2002年 | 323篇 |
2001年 | 338篇 |
2000年 | 291篇 |
1999年 | 274篇 |
1998年 | 219篇 |
1997年 | 216篇 |
1996年 | 223篇 |
1995年 | 189篇 |
1994年 | 198篇 |
1993年 | 195篇 |
1992年 | 192篇 |
1991年 | 201篇 |
1990年 | 194篇 |
1989年 | 185篇 |
1988年 | 162篇 |
1987年 | 179篇 |
1986年 | 139篇 |
1985年 | 170篇 |
1984年 | 198篇 |
1983年 | 181篇 |
1982年 | 155篇 |
1981年 | 135篇 |
1980年 | 143篇 |
1979年 | 138篇 |
1978年 | 126篇 |
1977年 | 113篇 |
1976年 | 114篇 |
1975年 | 115篇 |
1974年 | 101篇 |
1973年 | 86篇 |
1972年 | 65篇 |
排序方式: 共有10000条查询结果,搜索用时 890 毫秒
1.
Almog-Bar Michal Ashkenazi-Anor Mayrav Hersberger-Langloh Sophie E. Compion Sara Butcher Jacqueline 《Voluntas: International Journal of Voluntary and Nonprofit Organizations》2022,33(3):483-496
VOLUNTAS: International Journal of Voluntary and Nonprofit Organizations - Age has long been understood as a strong demographic determinant of volunteering. However, to date, limited literature... 相似文献
2.
3.
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
4.
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
5.
6.
Stephen J. Ruberg Frank E. Harrell Jr. Margaret Gamalo-Siebers Lisa LaVange J. Jack Lee Karen Price 《The American statistician》2019,73(1):319-327
ABSTRACTThe cost and time of pharmaceutical drug development continue to grow at rates that many say are unsustainable. These trends have enormous impact on what treatments get to patients, when they get them and how they are used. The statistical framework for supporting decisions in regulated clinical development of new medicines has followed a traditional path of frequentist methodology. Trials using hypothesis tests of “no treatment effect” are done routinely, and the p-value < 0.05 is often the determinant of what constitutes a “successful” trial. Many drugs fail in clinical development, adding to the cost of new medicines, and some evidence points blame at the deficiencies of the frequentist paradigm. An unknown number effective medicines may have been abandoned because trials were declared “unsuccessful” due to a p-value exceeding 0.05. Recently, the Bayesian paradigm has shown utility in the clinical drug development process for its probability-based inference. We argue for a Bayesian approach that employs data from other trials as a “prior” for Phase 3 trials so that synthesized evidence across trials can be utilized to compute probability statements that are valuable for understanding the magnitude of treatment effect. Such a Bayesian paradigm provides a promising framework for improving statistical inference and regulatory decision making. 相似文献
7.
8.
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
9.
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
10.
Susan D. Calkins Susan E. Dedmon Kathryn L. Gill Laura E. Lomax Laura M. Johnson 《Infancy》2002,3(2):175-197
A study sample of 162 six‐month‐old children was selected from a larger sample of 346 infants on the basis of parents' report of their infants' temperament and a laboratory assessment of temperament. Infants were classified as easily frustrated and less easily frustrated and compared on a number of emotion regulation, physiology, and temperament measures. Results indicated that male and female infants were equally likely to be classified as frustrated and less easily frustrated; however, male infants were less able to regulate physiologically. Easily frustrated infants used different emotion regulation strategies and were observed to be less attentive and more active than less easily frustrated infants when observed in the laboratory. These infants were also characterized by their parents as more active, less attentive, and more distressed to novelty. Infants classified as easily frustrated were more reactive physiologically and less able to regulate physiological reactivity than their less easily frustrated counterparts. It is hypothesized that this cluster of characteristics may constitute a unique temperamental type that may have implications for other types of behavioral functioning. Limitations of the study are that observations are based on a single brief assessment of the infant, modest effect sizes were found, and the study is cross‐sectional. 相似文献