全文获取类型
收费全文 | 5142篇 |
免费 | 102篇 |
专业分类
管理学 | 680篇 |
民族学 | 24篇 |
人口学 | 524篇 |
丛书文集 | 20篇 |
教育普及 | 1篇 |
理论方法论 | 487篇 |
综合类 | 59篇 |
社会学 | 2386篇 |
统计学 | 1063篇 |
出版年
2023年 | 32篇 |
2021年 | 50篇 |
2020年 | 89篇 |
2019年 | 116篇 |
2018年 | 128篇 |
2017年 | 195篇 |
2016年 | 139篇 |
2015年 | 81篇 |
2014年 | 133篇 |
2013年 | 784篇 |
2012年 | 160篇 |
2011年 | 145篇 |
2010年 | 124篇 |
2009年 | 109篇 |
2008年 | 137篇 |
2007年 | 127篇 |
2006年 | 148篇 |
2005年 | 112篇 |
2004年 | 112篇 |
2003年 | 76篇 |
2002年 | 98篇 |
2001年 | 131篇 |
2000年 | 122篇 |
1999年 | 132篇 |
1998年 | 101篇 |
1997年 | 86篇 |
1996年 | 93篇 |
1995年 | 68篇 |
1994年 | 60篇 |
1993年 | 87篇 |
1992年 | 89篇 |
1991年 | 97篇 |
1990年 | 78篇 |
1989年 | 78篇 |
1988年 | 61篇 |
1987年 | 68篇 |
1986年 | 62篇 |
1985年 | 75篇 |
1984年 | 66篇 |
1983年 | 69篇 |
1982年 | 44篇 |
1981年 | 40篇 |
1980年 | 37篇 |
1979年 | 47篇 |
1978年 | 38篇 |
1977年 | 33篇 |
1976年 | 34篇 |
1975年 | 32篇 |
1974年 | 40篇 |
1973年 | 29篇 |
排序方式: 共有5244条查询结果,搜索用时 11 毫秒
51.
McGivney WT 《Physician executive》1992,18(2):54-55
The author argues that the burden of proof for the safety and efficacy of some medical devices properly lies with the manufacturers of the devices and with the providers who use them. The controversy over breast implants is used as a case for this shift in the burden of proof of safety and effectiveness. 相似文献
52.
College newspapers are a powerful but underutilized medium for educating students on health issues, including those related to drug and alcohol use on campus. Editors of these publications are in a position to wield significant influence among their readers. In addition to communicating factual information about the prevalence and impact of substance use among college students, editors can use the press to advocate changes in students' attitudes and behaviors and in college or community policies that affect substance use. A pilot conference was held to help New England college newspaper editors perceive the importance of their role in educating their peers about substance use and other health-related issues, and to offer concrete suggestions as to how they can incorporate these topics into an "activist" campus press. 相似文献
53.
This is a report from a conference held in Tokyo, Japan, in 1991 on the economic aspects of labor mobility in Asia. The authors briefly describe selected papers given at the conference and outline conference topics. A list of participants is included. (SUMMARY IN FRE AND SPA) 相似文献
54.
Straubhaar T 《The International migration review》1992,26(2):462-483
"This article shows that an analysis of the impacts of immigration [in Western Europe] has to be divided into allocational and distributional aspects. From an allocational point of view, like free trade in goods, services and capital, migration is welfare-improving as long as marginal productivities of labor are not equalized worldwide. From a distributional point of view, however, the immigration society has to bear the effects of sharing its common public goods and its social values with the new immigrants. Free immigration will only be allowed if the allocational welfare gains exceed the distributional welfare losses. According to this rule of thumb, a guideline for an efficient migration policy is sketched." 相似文献
55.
56.
"This paper seeks to (1) identify socioeconomic variables that are expected to generate fertility differentials; (2) hypothesize the direction and magnitude of the effect of each variable by reference to a demand-for-children model; and (3) test empirically the model using evidence from Costa Rica. The estimates are obtained from a ten-percent systematic random sample of all Costa Rican individual-family households. There are 15,924 families in the sample...." The authors specifically seek "to capture the effects of changing relative prices and available income and time constraints on parental preferences for children. Least-squares estimates show statistically significant relationships between household fertility and opportunity cost of time, parental education, occurrence of an extended family, medical care, household sanitation, economic sector of employment, and household stock of nonhuman capital." 相似文献
57.
The economic adaptation of immigrants to Canada is analyzed using government data on the labor force and landed immigrants. In particular, the labor force experience of a sample of immigrants in Canada is examined and compared with that of a Canadian cohort with regard to length of unemployment and income. "Differences in unemployment and insurable earnings are examined by age, sex, immigrant category..., world area of last permanent residence, official language abilities, education, and region of residence." (summary in FRE, SPA) 相似文献
58.
59.
These experiments are concerned with individual behavior under risk and under uncertainty. By exploiting the isolation effect the experiments were able to offer to 134 subjects the possibility of actually gaining or losing an important sum of money.The experimental data show that under risk as well as under complete ignorance the subjects' attitudes towards prospects of gains and towards prospects of losses are totally unrelated.The data also show that when facing prospects of gains, the subjects generally take the exact probabilities of the events into account, whereas, when facing prospects of losses many of then have only recourse to coarser categories of plausibility, or even no longer use their information at all. 相似文献
60.
A scattering of recent research has studied the current politicalbeliefs and attitudes of individuals identified as "1960s activists."In contrast to much of the treatment accorded such people inthe popular media, this research tends to find most of theseactivists currently liberal on a wide variety of political topics.However, in the absence of panel data, most of this researchhas had to assess any change in the activists' attitudes eitherby assuming the activists' past positions or by trusting totheir retrospective reports. In this paper we report on panel data from a large group ofwhite activists, mostly students, who spent the summer of 1965organizing voter registration drives in Southern black communities.In some specific areas on which the activists tended to holdrather extreme positions in 1965, they may have moderated by1984. However, their overall pattern of response on a wide varietyof issues is basically stable over this twenty-year period. 相似文献