全文获取类型
收费全文 | 5143篇 |
免费 | 200篇 |
专业分类
管理学 | 920篇 |
民族学 | 41篇 |
人才学 | 1篇 |
人口学 | 406篇 |
丛书文集 | 22篇 |
理论方法论 | 613篇 |
综合类 | 68篇 |
社会学 | 2620篇 |
统计学 | 652篇 |
出版年
2023年 | 47篇 |
2022年 | 26篇 |
2021年 | 36篇 |
2020年 | 102篇 |
2019年 | 164篇 |
2018年 | 148篇 |
2017年 | 222篇 |
2016年 | 154篇 |
2015年 | 145篇 |
2014年 | 156篇 |
2013年 | 843篇 |
2012年 | 208篇 |
2011年 | 249篇 |
2010年 | 169篇 |
2009年 | 146篇 |
2008年 | 160篇 |
2007年 | 193篇 |
2006年 | 172篇 |
2005年 | 162篇 |
2004年 | 163篇 |
2003年 | 129篇 |
2002年 | 147篇 |
2001年 | 123篇 |
2000年 | 96篇 |
1999年 | 93篇 |
1998年 | 66篇 |
1997年 | 68篇 |
1996年 | 55篇 |
1995年 | 52篇 |
1994年 | 45篇 |
1993年 | 61篇 |
1992年 | 54篇 |
1991年 | 49篇 |
1990年 | 51篇 |
1989年 | 52篇 |
1988年 | 50篇 |
1987年 | 38篇 |
1986年 | 41篇 |
1985年 | 30篇 |
1984年 | 51篇 |
1983年 | 38篇 |
1982年 | 42篇 |
1981年 | 40篇 |
1980年 | 37篇 |
1979年 | 31篇 |
1978年 | 25篇 |
1977年 | 19篇 |
1976年 | 20篇 |
1975年 | 20篇 |
1974年 | 13篇 |
排序方式: 共有5343条查询结果,搜索用时 0 毫秒
991.
Currently, there is no mandatory labeling for products containing synthetic nanoparticles. The public as well as other stakeholders have positive views about mandatory labeling. However, little is known how such a label influences the risk and benefit perception of a product. Consumers may infer that a label is a signal that there are risks associated with this technology. Data were collected in a survey experiment (N= 1,382). Participants were randomly assigned to one of six conditions. The control group received a picture of a sunscreen container without a label. One experimental group received a picture of a sunscreen container with a label. The other groups received, in addition to the sunscreen container with a label, some risk or benefit information. Results suggest that labeling of products may reduce consumers' benefit perception and increase risk perception. Labeling nanotechnology consumer products may change the public perception of the products. Respondents may have relied on the affect heuristic for assessing the risks and benefits of the sunscreen. 相似文献
992.
This research introduces a framework for assessing concrete sustainability which is based upon the concept that technology is defined by stakeholders’ perspectives and which applied Analytic Hierarchy Process to translate these perspectives into quantifiable assessment values. A survey was conducted to identify important criteria, and several “design scenarios” were introduced which represent different value systems by varying criteria importance. Concrete materials with varying environmental impact were then assessed to observe the effect of different value systems and material properties, and it was found that the concrete with better properties was generally selected as most sustainable regardless of the design scenario. 相似文献
993.
994.
995.
996.
Jandl M 《International migration (Geneva, Switzerland)》2011,49(5):53-77
This paper presents a comprehensive review of available methods for sizing irregular migrant populations as a particular group in the study of hidden populations. Based on the existing body of literature on the subject, a generic classification scheme is developed that divides existing estimation procedures into subcategories like “approaches”, “methods” and “estimation techniques”. For each of these categories, basic principles, methodical strengths and weaknesses, as well as practical problems, are identified and discussed with the use of existing examples. Special emphasis is placed on data requirements, data shortcomings and possible estimation biases. In addition, based on the empirical classification and quality assessment of country-specific estimates developed in the CLANDESTINO research project, the potential and requirements for replicating best practice models in other countries are explored. Finally, a number of conclusions on the appropriate design of estimation projects are offered. 相似文献
997.
Mann M 《The British journal of sociology》2011,62(1):42-8; discussion 62-8
998.
Epidemiological studies have found that young men who have sex with men (YMSM) represent the majority of young people infected with HIV annually in the United States. Further, they are one of the few risk groups to show an increase in the rate of infections in recent years. In addition to these disparities in prevalence and infection rates, there is an inequity in prevention and intervention research on this population. The purpose of this article is to review the existing YMSM literature on HIV epidemiology, correlates of risk, and intervention research. The article concludes that promising future directions for basic research include a focus on multiple clustering health issues, processes that promote resiliency, the role of family influences, and the development of parsimonious models of risk. In terms of intervention research, the article suggests that promising future directions include Internet-based intervention delivery, integration of biomedical and behavioral approaches, and interventions that go beyond the individual level to address partnership, structural, community, and network factors. 相似文献
999.
Byrnes HF Miller BA Chamratrithirong A Rhucharoenpornpanich O Cupp PK Atwood KA Fongkaew W Rosati MJ Chookhare W 《Journal of drug education》2011,41(2):161-181
Due to concerns over Thai adolescent risky behaviors, effective prevention strategies are needed. Determining the role neighborhood context plays in program engagement and outcomes may inform these strategies. This study includes 170 mother-adolescent pairs (M = 13.44, SD = .52) in Bangkok, Thailand in a prevention program for adolescent substance use and sexual risk. Neighborhoods were related to engagement, which was critical to outcomes. Neighborhood disorganization was related to confidence in program effects and program completion. Completion was related to increased ATOD communication. Neighborhood cohesion was related to less program enjoyment, while neighborhood social control was related to more enjoyment. Enjoyment was related to increased ATOD communication and formation and monitoring of alcohol rules. Prevention strategies should focus on neighborhood contexts and enhancing engagement. 相似文献
1000.
In this paper, we examine the relative efficacy of two mechanisms--price consideration and the message of social responsibility--in accounting for Family Cap effects on fertility behavior. The Family Cap is a component of welfare reform policy that denies additional cash benefits to children born 10 or more months after a woman entered the welfare rolls. We use data from the New Jersey Family Development Program (FDP) evaluation that employed a classical experimental design. We find that fertility behaviors are influenced by both Family Cap price and message mechanisms but that these effects are conditioned by welfare recipients' time on welfare and race. Black women who have longer stays on welfare are more likely to be influenced by price while women with shorter stays are influenced by both price and the social message. We believe our results have implications not only for future public welfare policy initiatives but for any social policies that attempt to influence behavior directly, through individual rewards and punishments, and indirectly through the activation of social or community pressures. 相似文献