全文获取类型
收费全文 | 43010篇 |
免费 | 2637篇 |
国内免费 | 1705篇 |
专业分类
管理学 | 5439篇 |
劳动科学 | 1篇 |
民族学 | 602篇 |
人才学 | 5篇 |
人口学 | 3672篇 |
丛书文集 | 2101篇 |
教育普及 | 2篇 |
理论方法论 | 2908篇 |
现状及发展 | 1篇 |
综合类 | 10476篇 |
社会学 | 15554篇 |
统计学 | 6591篇 |
出版年
2023年 | 203篇 |
2022年 | 214篇 |
2021年 | 413篇 |
2020年 | 870篇 |
2019年 | 1638篇 |
2018年 | 1912篇 |
2017年 | 2140篇 |
2016年 | 2138篇 |
2015年 | 1637篇 |
2014年 | 1763篇 |
2013年 | 6158篇 |
2012年 | 2300篇 |
2011年 | 1949篇 |
2010年 | 1479篇 |
2009年 | 1184篇 |
2008年 | 1122篇 |
2007年 | 962篇 |
2006年 | 971篇 |
2005年 | 1481篇 |
2004年 | 1258篇 |
2003年 | 1022篇 |
2002年 | 844篇 |
2001年 | 1010篇 |
2000年 | 955篇 |
1999年 | 729篇 |
1998年 | 553篇 |
1997年 | 500篇 |
1996年 | 570篇 |
1995年 | 495篇 |
1994年 | 486篇 |
1993年 | 472篇 |
1992年 | 549篇 |
1991年 | 522篇 |
1990年 | 482篇 |
1989年 | 461篇 |
1988年 | 489篇 |
1987年 | 407篇 |
1986年 | 368篇 |
1985年 | 444篇 |
1984年 | 437篇 |
1983年 | 383篇 |
1982年 | 333篇 |
1981年 | 279篇 |
1980年 | 255篇 |
1979年 | 315篇 |
1978年 | 267篇 |
1977年 | 240篇 |
1976年 | 196篇 |
1975年 | 218篇 |
1974年 | 184篇 |
排序方式: 共有10000条查询结果,搜索用时 257 毫秒
971.
近年来,未成年人犯罪呈上升趋势,这一问题已经引起全社会的高度关注和重视。对未成年人犯罪的惩戒,核心价值不在于报应和震慑,解决问题的关键在于弱化、消除犯罪行为对社会造成的不良影响,侧重于对未成年人的身心矫治。检察机关运用刑事和解、暂缓起诉、社区矫正等“恢复性司法”制度处理未成年人犯罪,取得了良好的社会效果。运用“恢复性司法”处理未成年人犯罪,既有赖于立法的支撑,更有赖于司法的践行。 相似文献
972.
Data envelopment analysis (DEA) is the most commonly used approach for evaluating healthcare efficiency [B. Hollingsworth, The measurement of efficiency and productivity of health care delivery. Health Economics 17(10) (2008), pp. 1107–1128], but a long-standing concern is that DEA assumes that data are measured without error. This is quite unlikely, and DEA and other efficiency analysis techniques may yield biased efficiency estimates if it is not realized [B.J. Gajewski, R. Lee, M. Bott, U. Piamjariyakul, and R.L. Taunton, On estimating the distribution of data envelopment analysis efficiency scores: an application to nursing homes’ care planning process. Journal of Applied Statistics 36(9) (2009), pp. 933–944; J. Ruggiero, Data envelopment analysis with stochastic data. Journal of the Operational Research Society 55 (2004), pp. 1008–1012]. We propose to address measurement error systematically using a Bayesian method (Bayesian DEA). We will apply Bayesian DEA to data from the National Database of Nursing Quality Indicators® to estimate nursing units’ efficiency. Several external reliability studies inform the posterior distribution of the measurement error on the DEA variables. We will discuss the case of generalizing the approach to situations where an external reliability study is not feasible. 相似文献
973.
974.
Michael Kirchler David Andersson Caroline Bonn Magnus Johannesson Erik Ø. Sørensen Matthias Stefan Gustav Tinghög Daniel Västfjäll 《Journal of Risk and Uncertainty》2017,54(1):37-59
We experimentally compare fast and slow decisions in a series of experiments on financial risk taking in three countries involving over 1700 subjects. To manipulate fast and slow decisions, subjects were randomly allocated to responding within 7 seconds (time pressure) or waiting for at least 7 or 20 seconds (time delay) before responding. To control for different effects of time pressure and time delay on measurement noise, we estimate separate parameters for noise and risk preferences within a random utility framework. We find that time pressure increases risk aversion for gains and risk taking for losses compared to time delay, implying that time pressure increases the reflection effect of Prospect Theory. The results for gains are weaker and less robust than the results for losses. We find no significant difference between time pressure and time delay for loss aversion (tested in only one of the experiments). Time delay also leads to less measurement noise than time pressure and unconstrained decisions, and appears to be an effective way of decreasing noise in experiments. 相似文献
975.
This qualitative content analysis of online documents compiled from the North American Animal Liberation Front (ALF), Earth Liberation Kollective (ELK) and Grassroots Ontario Animal Liberation (GOAL) network websites and Facebook pages explores how activism within the Radical Animal Liberation Movement (RALM) intersects with other social movements. While most literature to date traces the RALM’s (dis)junctures with other forms of social justice activism through analyses of their broad ideological assumptions, or the views of renowned RALM scholars, this research provides authentic insights into the voices of Canadian, American and Mexican activists as they are represented in documents they author themselves. Like activists in anarchistic, anti-capitalist, immigrant rights, Indigenous, prison abolition, prisoner support and radical feminist movements, those in the RALM critique capitalism, colonialism, hierarchy, racism, sexism, state power and the prison industrial complex. Our research calls into question the existing narratives that depict the RALM as an extremist, single-issue movement oblivious to all other forms of social inequality, injustice, marginalization and oppression. Rather, RALM activists are building alliances with other radical social movements to achieve the common goal of ending both human and animal suffering and exploitation. 相似文献
976.
Juan Fernández Sánchez 《Journal of nonparametric statistics》2014,26(1):129-140
In this paper, we characterise a family of bivariate copulas whose sections between the main diagonal and the border of the unit square are polynomial, generalising several families of copulas, including those with quadratic and cubic sections. We also study a measure of association and the tail dependence for this class, illustrating our results with several examples. 相似文献
977.
We propose new dynamic measures of uncertainty based on the notion of generalized dynamic entropy introduced in Di Crescenzo and Longobardi (2006). These can uniquely determine distribution functions in continuous and discrete cases, and the characterizations of some well-known distributions are provided. We also define some orderings and aging notions based on the generalized dynamic measures, and prove some of their properties, obtaining as corollaries results that have recently appeared in the literature. 相似文献
978.
Robert J. Mitkus David B. King Mark O. Walderhaug Richard A. Forshee 《Risk analysis》2014,34(4):735-750
The use of thimerosal preservative in childhood vaccines has been largely eliminated over the past decade in the United States because vaccines have been reformulated in single‐dose vials that do not require preservative. An exception is the inactivated influenza vaccines, which are formulated in both multidose vials requiring preservative and preservative‐free single‐dose vials. As part of an ongoing evaluation by USFDA of the safety of biologics throughout their lifecycle, the infant body burden of mercury following scheduled exposures to thimerosal preservative in inactivated influenza vaccines in the United States was estimated and compared to the infant body burden of mercury following daily exposures to dietary methylmercury at the reference dose established by the USEPA. Body burdens were estimated using kinetic parameters derived from experiments conducted in infant monkeys that were exposed episodically to thimerosal or MeHg at identical doses. We found that the body burden of mercury (AUC) in infants (including low birth weight) over the first 4.5 years of life following yearly exposures to thimerosal was two orders of magnitude lower than that estimated for exposures to the lowest regulatory threshold for MeHg over the same time period. In addition, peak body burdens of mercury following episodic exposures to thimerosal in this worst‐case analysis did not exceed the corresponding safe body burden of mercury from methylmercury at any time, even for low‐birth‐weight infants. Our pharmacokinetic analysis supports the acknowledged safety of thimerosal when used as a preservative at current levels in certain multidose infant vaccines in the United States. 相似文献
979.
Security of infrastructure is a major concern. Traditional security schedules are unable to provide omnipresent coverage; consequently, adversaries can exploit predictable vulnerabilities to their advantage. Randomized security schedules, which randomly deploy security measures, overcome these limitations, but public perceptions of such schedules have not been examined. In this experiment, participants were asked to make a choice between attending a venue that employed a traditional (i.e., search everyone) or a random (i.e., a probability of being searched) security schedule. The absolute probability of detecting contraband was manipulated (i.e., 1/10, 1/4, 1/2) but equivalent between the two schedule types. In general, participants were indifferent to either security schedule, regardless of the probability of detection. The randomized schedule was deemed more convenient, but the traditional schedule was considered fairer and safer. There were no differences between traditional and random schedule in terms of perceived effectiveness or deterrence. Policy implications for the implementation and utilization of randomized schedules are discussed. 相似文献
980.
Through a comparison of the life and career trajectories of thirty male and thirty female CEOs of large organizations, this study offers insights into the genesis of gender disparity in corporate leadership positions, discusses the implications for leadership development, and puts forward a model explaining the disparity in CEO roles. We found gendered patterns in the accumulation of career relevant experiences stretching back to birth into working lives that created significant and cumulative limitations upon the ability of women to access CEO roles and the types of CEO appointments available to them. Limited access to career relevant experiences in childhood, adolescence and in organizations lead to on-going limitations in capital accumulation throughout women's careers. Implications of our findings for both theory and practice are discussed. 相似文献