全文获取类型
收费全文 | 2182篇 |
免费 | 59篇 |
专业分类
管理学 | 314篇 |
民族学 | 45篇 |
人口学 | 165篇 |
丛书文集 | 9篇 |
理论方法论 | 238篇 |
综合类 | 20篇 |
社会学 | 1164篇 |
统计学 | 286篇 |
出版年
2021年 | 11篇 |
2020年 | 35篇 |
2019年 | 65篇 |
2018年 | 66篇 |
2017年 | 63篇 |
2016年 | 54篇 |
2015年 | 43篇 |
2014年 | 51篇 |
2013年 | 468篇 |
2012年 | 63篇 |
2011年 | 71篇 |
2010年 | 58篇 |
2009年 | 53篇 |
2008年 | 55篇 |
2007年 | 48篇 |
2006年 | 53篇 |
2005年 | 63篇 |
2004年 | 54篇 |
2003年 | 37篇 |
2002年 | 63篇 |
2001年 | 47篇 |
2000年 | 32篇 |
1999年 | 37篇 |
1998年 | 30篇 |
1997年 | 33篇 |
1996年 | 28篇 |
1995年 | 22篇 |
1994年 | 26篇 |
1993年 | 25篇 |
1992年 | 29篇 |
1991年 | 23篇 |
1990年 | 20篇 |
1989年 | 22篇 |
1988年 | 25篇 |
1987年 | 25篇 |
1986年 | 21篇 |
1985年 | 24篇 |
1984年 | 26篇 |
1983年 | 24篇 |
1982年 | 21篇 |
1981年 | 23篇 |
1979年 | 15篇 |
1978年 | 20篇 |
1977年 | 15篇 |
1976年 | 20篇 |
1975年 | 17篇 |
1974年 | 13篇 |
1973年 | 12篇 |
1972年 | 10篇 |
1971年 | 12篇 |
排序方式: 共有2241条查询结果,搜索用时 515 毫秒
41.
George W. Leeson 《Journal of Population Research》2017,34(1):1-15
The world is ageing both at an individual and a population level, and population ageing is truly a global phenomenon. Life expectancies at birth have increased at the global level from 47 years in the mid-20th century to around 70 years today, and are expected to rise to 76 years by the mid-21st century. The proportion of the world’s population aged 60 years and over has increased from 8 % in the mid-20th century to 12 %, and by 2050 it is expected to reach 21 %. The emergence of large numbers of centenarians has accompanied this development. This paper outlines this emergence historically and the likely growth in the number of centenarians in the 21st century, in particular in England and Wales, analysing mortality trends since 1840 and the rise in the number of centenarians in the 20th and 21st centuries. The number of centenarians in England and Wales increased from around 160 in 1922 to almost 12,500 by 2012, but if mortality at all ages had remained constant from 1912 to 2012, then by 2012 the number of centenarians would only have been around 720. By 2100, the number of centenarians is expected to reach around 1.4 million, but if future mortality at all ages were to remain constant, then by 2100 the number of centenarians would be around 78,000. However, if predicted mortality for those aged 55 years and over was to decrease by an additional 5 % every 5 years until 2100, then the number of centenarians in England and Wales would reach around 1.8 million by the end of the century. 相似文献
42.
Philip Looper David George Eric J. Johnson Susan E. Conway 《Journal of American college health : J of ACH》2017,65(7):513-517
Objective: To examine the perceptions among faculty and health professional students regarding mandatory vaccination policies on a health sciences campus. Participants: A total of 296 faculty and 244 students completed surveys during Fall 2015. Methods: The online survey administered to individuals who received the influenza vaccine during the fall 2015 influenza vaccination clinic season included five items evaluating perceptions of employer mandatory vaccination requirements. Results: Chi-square analysis indicated that although faculty and students agree mandatory vaccinations in a health care environment are appropriate, faculty are more likely than students to get vaccinated in the absence of a mandate. Additionally, a small fraction of faculty would consider employment elsewhere when facing this mandate. Conclusions: Overall, faculty and students had favorable perceptions about mandatory influenza vaccine policies. Since students were less likely to be vaccinated in the absence of a mandate, education of students should be improved to support the importance of vaccinations in a health care environment. 相似文献
43.
Elizabeth C. Neilson Danielle R. Eakins Kelly Cue Davis Jeanette Norris William H. George 《Journal of sex research》2017,54(6):764-775
This study examined the role of depressive symptoms, acute intoxication, and risk rationale in men’s use of condom use resistance (CUR) tactics in an experimental study. Participants included 313 heterosexual male, nonproblem drinkers, ages 21 to 30. Participants were randomized to one of four beverage conditions: no alcohol, placebo, low (.04%) alcohol dose, or high (.08%) alcohol dose. They read an eroticized scenario depicting a consensual sexual encounter with a female partner who requested a condom to prevent either pregnancy or sexually transmitted infections (STIs) (risk rationale) and then indicated their intentions to use 10 different CUR tactics. Hypotheses related to the pharmacological, dosage, and expectancy effects of alcohol were tested in a generalized linear model. In intoxicated (.04% and .08%) men who were given a pregnancy risk rationale, depressive symptoms were associated with stronger intentions to use CUR tactics than in sober (control and placebo) men. Men who received a high alcohol dose (.08%) and who were given a pregnancy risk rationale reported higher intentions to use CUR tactics than those who received a lower alcohol dose (.04%). Findings suggest that the pharmacological effects of alcohol on men’s likelihood to resist condoms vary by the saliency of the risk rationale and mood-related variables. 相似文献
44.
Theory and Society - This article argues that Orlando Patterson is a key contributor to postcolonial fiction and postcolonial theory as well as historical sociology and social theory, whose work... 相似文献
45.
Bridget M. Nugent Rajanikanth Madabushi Barbara Buch Vasum Peiris Victor Crentsil Virginia M. Miller Jonca Bull Marjorie R. Jenkins 《Pharmaceutical statistics》2021,20(5):929-938
Differences in patient characteristics, including age, sex, and race influence the safety and effectiveness of drugs, biologic products, and medical devices. Here we provide a summary of the topics discussed during the opening panel at the 2018 Johns Hopkins Center for Excellence in Regulatory Science and Innovation symposium on Assessing and Communicating Heterogeneity of Treatment Effects for Patient Subpopulations: Challenges and Opportunities. The goal of this session was to provide a brief overview of FDA-regulated therapeutics, including drugs, biologics and medical devices, and some of the major sources of heterogeneity of treatment effects (HTE) related to patient demographics, such as age, sex and race. The panel discussed the US Food and Drug Administration's role in reviewing and regulating drugs, devices, and biologic products and the challenges associated with ensuring that diverse patient populations benefit from these therapeutics. Ultimately, ensuring diverse demographic inclusion in clinical trials, and designing basic and clinical research studies to account for the intended patient population's age, sex, race, and genetic factors among other characteristics, will lead to better, safer therapies for diverse patient populations. 相似文献
46.
Samuel Adomako Joseph Amankwah-Amoah George Obeng Dankwah Albert Danso Francis Donbesuur 《Journal of International Management》2019,25(4):100666
Much of the existing scholarly works portray institutional voids (IVs) in emerging economies as impeding forces against the development of new ventures. However, little attention has been paid to how such voids generate positive outcomes in emerging market new ventures. Drawing on the institutional theory, we propose IVs as crucial enablers of new venture internationalization. In addition, we investigate both how and when IVs enhance the degree to which new ventures internationalize by examining international learning effort (ILE) as a mediator and two domestic market environmental factors (i.e., environmental dynamism and competitive intensity) as important contingencies. We test our moderated mediation model using primary data gathered from 211 new ventures from Ghana. We found that ILE mediates the relationship between IVs and new venture internationalization and that both environmental dynamism and competitive intensity moderate the indirect relationship between home-country IVs and new venture internationalization. We discuss the theoretical and practical implications of this study. 相似文献
47.
Elizabeth R. Bird Cynthia A. Stappenbeck Elizabeth C. Neilson Natasha K. Gulati William H. George M. Lynne Cooper 《Journal of sex research》2019,56(2):156-165
One in five college women experience sexual victimization (SV), and SV severity is associated with subsequent psychological distress, including sex-related distress. SV severity may also be associated with drinking motives to cope with sex-related distress and to enhance sex (sex-related drinking motives [SRDMs]), particularly if individuals suffer from emotion regulation (ER) difficulties. College women (N = 151) completed a survey assessment of ER, SV history, childhood sexual abuse (CSA), and SRDMs. Twelve regression models assessed six facets of ER as moderators between SV severity and SRDMs. Among women with no or low levels of prior SV severity, women with greater access to ER strategies were less likely to endorse drinking to cope SRDMs. At higher levels of SV severity, women at all levels of access to ER strategies were equally likely to endorse drinking to cope SRDMs, suggesting that access to ER strategies did not mitigate motivations to drink to cope with sex-related distress for these women. Women with severe SV histories may benefit from interventions that build on existing ER strengths or address other factors. However, greater access to ER strategies may serve as a protective factor against SRDMs when SV severity is low. 相似文献
48.
George Yancey 《The American Sociologist》2018,49(2):336-343
Larregue argued that while there is an ideological imbalance among academics that this imbalance has not unfairly impacted our findings. He also implies that it is the activism of conservatives, rather than progressives, which has created real problems in academia. As such he disputes claims that activism among progressive academics has create a backlash from political conservatives. However, Larregue does not address the previous empirical work on the subject of academic bias. Furthermore, his argument of methodological rigor does not address the tendency of scholars to overlook alternate theories. His argument that progressive scholars are no more biased than conservative scholars fails to account for the sheer number of progressive scholars relative to conservative scholars as it concerns the possibly of institutional bias. I also find his focus on fraud to be misplaced since scholars do not have to engage in fraud to be in ideological silos that do not take alternative theories into account. As to his second major argument, I am unsure whether liberal academic activism leads to conservative mistrust and await further future research on this topic. I do commend Larregue in bringing the question of sources of conservative mistust to our attention. 相似文献
49.
In this paper, a new generalization of the Kumaraswamy distribution namely, the Kumaraswamy Marshall-Olkin Exponential distribution (KwMOE) is introduced and studied. Various properties are explored. The structural analysis includes various aspects such as limiting behaviour, shape properties, moments, quantiles, mean deviation, Renyi entropy, order statistics and stochastic ordering. Some useful characterizations of the family are also obtained. The method of maximum likelihood is used to estimate the model parameters. Monte Carlo simulation study is being conducted. An application to a real data set is presented for illustrative purposes. 相似文献
50.