全文获取类型
收费全文 | 9693篇 |
免费 | 212篇 |
国内免费 | 1篇 |
专业分类
管理学 | 1202篇 |
民族学 | 70篇 |
人口学 | 1074篇 |
丛书文集 | 32篇 |
理论方法论 | 836篇 |
综合类 | 125篇 |
社会学 | 4624篇 |
统计学 | 1943篇 |
出版年
2023年 | 79篇 |
2022年 | 54篇 |
2021年 | 82篇 |
2020年 | 196篇 |
2019年 | 267篇 |
2018年 | 385篇 |
2017年 | 470篇 |
2016年 | 363篇 |
2015年 | 215篇 |
2014年 | 312篇 |
2013年 | 1748篇 |
2012年 | 401篇 |
2011年 | 276篇 |
2010年 | 209篇 |
2009年 | 181篇 |
2008年 | 205篇 |
2007年 | 178篇 |
2006年 | 195篇 |
2005年 | 171篇 |
2004年 | 180篇 |
2003年 | 156篇 |
2002年 | 171篇 |
2001年 | 179篇 |
2000年 | 176篇 |
1999年 | 182篇 |
1998年 | 150篇 |
1997年 | 140篇 |
1996年 | 134篇 |
1995年 | 119篇 |
1994年 | 107篇 |
1993年 | 111篇 |
1992年 | 128篇 |
1991年 | 133篇 |
1990年 | 129篇 |
1989年 | 150篇 |
1988年 | 87篇 |
1987年 | 111篇 |
1986年 | 98篇 |
1985年 | 119篇 |
1984年 | 100篇 |
1983年 | 104篇 |
1982年 | 82篇 |
1981年 | 84篇 |
1980年 | 78篇 |
1979年 | 81篇 |
1978年 | 84篇 |
1977年 | 60篇 |
1976年 | 66篇 |
1975年 | 63篇 |
1974年 | 59篇 |
排序方式: 共有9906条查询结果,搜索用时 15 毫秒
1.
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
2.
3.
Ce Shen Jessica Johnson Zhenhe Chi John B. Williamson 《International social security review》2020,73(2):3-26
China’s pension reform during the past three decades has allowed a majority of China’s population to be covered by a pension scheme. Of particular note has been the New Rural Pension Scheme (NRPS), a voluntary programme introduced starting in 2009. One goal of our analysis is to assess that pension scheme, using a variety of sources of information including data drawn from recent (2013 and 2015) nationwide China Health and Retirement Longitudinal Surveys (CHARLS). Our analysis involves an exploration of differences between the generosity and structure of the NRPS and other pension schemes currently in place. We also explore the feasibility of reforming the current “quasi-social pension” component of the NRPS by substituting a universal non-contributory social pension pillar. In connection with our assessment of the NRPS, we note the unusually low benefit levels for rural China. 相似文献
4.
Generally, the semiclosed-form option pricing formula for complex financial models depends on unobservable factors such as stochastic volatility and jump intensity. A popular practice is to use an estimate of these latent factors to compute the option price. However, in many situations this plug-and-play approximation does not yield the appropriate price. This article examines this bias and quantifies its impacts. We decompose the bias into terms that are related to the bias on the unobservable factors and to the precision of their point estimators. The approximated price is found to be highly biased when only the history of the stock price is used to recover the latent states. This bias is corrected when option prices are added to the sample used to recover the states' best estimate. We also show numerically that such a bias is propagated on calibrated parameters, leading to erroneous values. The Canadian Journal of Statistics 48: 8–35; 2020 © 2019 Statistical Society of Canada 相似文献
5.
Sant’Anna Annibal Parracho de Freitas Siqueira Sadok Menna Barreto Márcia 《Social indicators research》2020,148(3):733-746
Social Indicators Research - This paper analyses the Human Development Index (HDI) time series from 2010 to 2017. An alternative index is studied, which combines the same components of the HDI by... 相似文献
6.
Existence and Nash implementation of efficient sharing rules for a commonly owned technology 总被引:2,自引:0,他引:2
Suppose that a group of individuals owns collectively a technology which produces a consumption good by means of a (possibly
heterogeneous) input. A sharing rule associates input contributions with a vector of consumptions that are technologically
feasible. We show that the set of allocations obtained by any continuous sharing rule contains Pareto efficient allocations.
We also present a mechanism that implements in Nash equilibrium the Pareto efficient allocations contained in an arbitrary
sharing rule.
Received: 29 June 1998/Accepted: 15 November 2000 相似文献
7.
8.
9.
10.
Diane Hope Weixing Zhu Corinna Gries Jacob Oleson Jason Kaye Nancy B. Grimm Lawrence A. Baker 《Urban Ecosystems》2005,8(3-4):251-273
We explored variations in inorganic soil nitrogen (N) concentrations across metropolitan Phoenix, Arizona, and the surrounding
desert using a probability-based synoptic survey. Data were examined using spatial statistics on the entire region, as well
as for the desert and urban sites separately. Concentrations of both NO3-N and NH4-N were markedly higher and more heterogeneous amongst urban compared to desert soils. Regional variation in soil NO3-N concentration was best explained by latitude, land use history, population density, along with percent cover of impervious
surfaces and lawn, whereas soil NH4-N concentrations were related to only latitude and population density. Within the urban area, patterns in both soil NO3-N and NH4-N were best predicted by elevation, population density and type of irrigation in the surrounding neighborhood. Spatial autocorrelation
of soil NO3-N concentrations explained 49% of variation among desert sites but was absent between urban sites. We suggest that inorganic
soil N concentrations are controlled by a number of ‘local’ or ‘neighborhood’ human-related drivers in the city, rather than
factors related to an urban-rural gradient. 相似文献