全文获取类型
收费全文 | 9944篇 |
免费 | 285篇 |
国内免费 | 25篇 |
专业分类
管理学 | 1194篇 |
劳动科学 | 2篇 |
民族学 | 54篇 |
人口学 | 745篇 |
丛书文集 | 381篇 |
理论方法论 | 773篇 |
综合类 | 1371篇 |
社会学 | 3724篇 |
统计学 | 2010篇 |
出版年
2023年 | 64篇 |
2022年 | 74篇 |
2021年 | 74篇 |
2020年 | 146篇 |
2019年 | 190篇 |
2018年 | 190篇 |
2017年 | 292篇 |
2016年 | 213篇 |
2015年 | 208篇 |
2014年 | 268篇 |
2013年 | 1628篇 |
2012年 | 331篇 |
2011年 | 313篇 |
2010年 | 298篇 |
2009年 | 313篇 |
2008年 | 351篇 |
2007年 | 332篇 |
2006年 | 293篇 |
2005年 | 247篇 |
2004年 | 204篇 |
2003年 | 248篇 |
2002年 | 274篇 |
2001年 | 310篇 |
2000年 | 222篇 |
1999年 | 164篇 |
1998年 | 131篇 |
1997年 | 136篇 |
1996年 | 129篇 |
1995年 | 114篇 |
1994年 | 88篇 |
1993年 | 129篇 |
1992年 | 142篇 |
1991年 | 122篇 |
1990年 | 131篇 |
1989年 | 109篇 |
1988年 | 107篇 |
1987年 | 111篇 |
1986年 | 100篇 |
1985年 | 84篇 |
1984年 | 116篇 |
1983年 | 98篇 |
1982年 | 94篇 |
1981年 | 63篇 |
1980年 | 93篇 |
1979年 | 105篇 |
1978年 | 72篇 |
1977年 | 82篇 |
1976年 | 70篇 |
1975年 | 85篇 |
1974年 | 68篇 |
排序方式: 共有10000条查询结果,搜索用时 15 毫秒
1.
Dennis Wagenaar Tiaravanni Hermawan Marc J. C. van den Homberg Jeroen C. J. H. Aerts Heidi Kreibich Hans de Moel Laurens M. Bouwer 《Risk analysis》2021,41(1):37-55
Damage models for natural hazards are used for decision making on reducing and transferring risk. The damage estimates from these models depend on many variables and their complex sometimes nonlinear relationships with the damage. In recent years, data‐driven modeling techniques have been used to capture those relationships. The available data to build such models are often limited. Therefore, in practice it is usually necessary to transfer models to a different context. In this article, we show that this implies the samples used to build the model are often not fully representative for the situation where they need to be applied on, which leads to a “sample selection bias.” In this article, we enhance data‐driven damage models by applying methods, not previously applied to damage modeling, to correct for this bias before the machine learning (ML) models are trained. We demonstrate this with case studies on flooding in Europe, and typhoon wind damage in the Philippines. Two sample selection bias correction methods from the ML literature are applied and one of these methods is also adjusted to our problem. These three methods are combined with stochastic generation of synthetic damage data. We demonstrate that for both case studies, the sample selection bias correction techniques reduce model errors, especially for the mean bias error this reduction can be larger than 30%. The novel combination with stochastic data generation seems to enhance these techniques. This shows that sample selection bias correction methods are beneficial for damage model transfer. 相似文献
2.
陈雪 《中华女子学院学报》2015,(2):110-113
作为一门独立的学科,妇女学(Woman’s Study)最早诞生于20世纪60年代的美国高校。加州圣地亚哥大学于1970年建立了全美第一个妇女学系,这在世界范围内也是第一个妇女学系。社会性别作为一种分析范畴,与妇女学的诞生、发展是一致的。二者都是在20世纪60年代的女权主义运动中诞生的。学者们将社会性别作为一种分析工具引入社会学、人类学、历史学、文学等各个学术领域,并由此对整个人文社会科学领域 相似文献
3.
Researchers have been developing various extensions and modified forms of the Weibull distribution to enhance its capability for modeling and fitting different data sets. In this note, we investigate the potential usefulness of the new modification to the standard Weibull distribution called odd Weibull distribution in income economic inequality studies. Some mathematical and statistical properties of this model are proposed. We obtain explicit expressions for the first incomplete moment, quantile function, Lorenz and Zenga curves and related inequality indices. In addition to the well-known stochastic order based on Lorenz curve, the stochastic order based on Zenga curve is considered. Since the new generalized Weibull distribution seems to be suitable to model wealth, financial, actuarial and especially income distributions, these findings are fundamental in the understanding of how parameter values are related to inequality. Also, the estimation of parameters by maximum likelihood and moment methods is discussed. Finally, this distribution has been fitted to United States and Austrian income data sets and has been found to fit remarkably well in compare with the other widely used income models. 相似文献
4.
5.
Arnfinn H. Midtbøen 《The British journal of sociology》2015,66(1):193-214
Although field experiments have documented the contemporary relevance of discrimination in employment, theories developed to explain the dynamics of differential treatment cannot account for differences across organizational and institutional contexts. In this article, I address this shortcoming by presenting the main empirical findings from a multi‐method research project, in which a field experiment of ethnic discrimination in the Norwegian labour market was complemented with forty‐two in‐depth interviews with employers who were observed in the first stage of the study. While the experimental data support earlier findings in documenting that ethnic discrimination indeed takes place, the qualitative material suggests that theorizing in the field experiment literature have been too concerned with individual and intra‐psychic explanations. Discriminatory outcomes in employment processes seems to be more dependent on contextual factors such as the number of applications received, whether requirements are specified, and the degree to which recruitment procedures are formalized. I argue that different contexts of employment provide different opportunity structures for discrimination, a finding with important theoretical and methodological implications. 相似文献
6.
7.
8.
H. Küchenhoff 《Statistical Papers》1995,36(1):41-47
The simple logistic regression model with normal measurement error and normal regressor is shown to be identifiable without any extra information about the measurement error. The multiple logistic regression model with more than one regressor variable measured with error is not identifiable. If the covariance matrix of the measurement error is known up to a scalar factor, the model is identified. Further we discuss why in spite of the identifiability the models cannot be estimated in a reasonable way without extra information about the measurement error. 相似文献
9.
10.
Using an increasing returns specification for distribution, an inverted U pattern between the share of distribution in gross domestic product and the level of development is shown to arise. A cross-section time-series data set is constructed and merged with one used to analyze the service sector. In contrast to the rising pattern found for services, an average time-series relation that exhibits an inverted U pattern is established. The empirical results are robust, for example, to choice of functional form and country and time period coverage. A similar pattern is found in the average cross-section (country) relation between distribution and development. 相似文献