首页 | 本学科首页   官方微博 | 高级检索  
文章检索
  按 检索   检索词:      
出版年份:   被引次数:   他引次数: 提示:输入*表示无穷大
  收费全文   1227篇
  免费   28篇
管理学   215篇
民族学   11篇
人口学   93篇
丛书文集   5篇
理论方法论   154篇
综合类   5篇
社会学   547篇
统计学   225篇
  2023年   7篇
  2020年   13篇
  2019年   35篇
  2018年   36篇
  2017年   31篇
  2016年   25篇
  2015年   25篇
  2014年   31篇
  2013年   266篇
  2012年   35篇
  2011年   43篇
  2010年   33篇
  2009年   31篇
  2008年   30篇
  2007年   31篇
  2006年   25篇
  2005年   34篇
  2004年   29篇
  2003年   17篇
  2002年   38篇
  2001年   24篇
  2000年   22篇
  1999年   27篇
  1998年   18篇
  1997年   20篇
  1996年   17篇
  1995年   10篇
  1994年   10篇
  1993年   16篇
  1992年   11篇
  1991年   15篇
  1990年   11篇
  1989年   11篇
  1988年   12篇
  1987年   16篇
  1986年   11篇
  1985年   17篇
  1984年   16篇
  1983年   11篇
  1982年   11篇
  1981年   15篇
  1979年   9篇
  1978年   9篇
  1976年   11篇
  1975年   11篇
  1974年   6篇
  1972年   8篇
  1971年   10篇
  1969年   7篇
  1968年   7篇
排序方式: 共有1255条查询结果,搜索用时 546 毫秒
991.
This inquiry examines comparative trends in collaboration among scholars, both over several decades and for several scientific disciplines. Findings suggest that in sociology specifically and science generally the trend is toward greater collaborative scholarship. At the turn of the twentieth century, better than 90 percent of the articles appearing in major periodicals in physics, biochemistry, biology, and chemistry were sole authored. Today, over 95 percent of such articles are collaboratively published. Disciplines affiliated with the social and mathematical sciences have experienced similar monotonic increases in collaborative activity, albeit, at a slower rate. A discussion of plausible explanations is offered for this observed growth in scientific collaboration.  相似文献   
992.
Conclusion  Although the high-wage doctrine — the belief that the level of aggregate demand is determined by the level of wage rates — is most often associated with the Great Depression, the doctrine’s effects on wage policy go back at least two decades further. Rather than having been a product of desperate times, the doctrine gained wide acceptance during the prosperous 1920s as businessmen and economists, citing the success of Henry Ford's continuing high-wage policies, and the (supposedly counterproductive) wage deflation that had marked the steep depression of 1920-21, applied the doctrine's demand-enhancing logic to push for an economy-wide minimum wage. The authors thank Fred Bateman, Don Bellante, Roger Garrison, Peter Klein, and Anthony Patrick O’Brien for thoughtful comments and suggestions.  相似文献   
993.
VOLUNTAS: International Journal of Voluntary and Nonprofit Organizations - A combination of computer-aided qualitative data analysis (CAQDAS) and latent class analysis (LCA) can substantially...  相似文献   
994.
This paper develops the idea of animation in user interfaces designed for decision support systems (DSS), proposes a framework to investigate the efficacy of animation in these interfaces, and reports on a study that examined the effects of properties of animation specified by the framework. Based on a review of selected background literature, principal properties affecting the efficacy of animation in user interfaces designed for DSS are identified and the effects on decision quality of three of these properties are hypothesized. To evaluate these hypotheses, data was collected in a laboratory experiment involving two different tasks. The results for both tasks indicate that animation in user interfaces designed for DSS should employ parallel as opposed to sequential navigation interactivity techniques. The decision quality of subjects that used a parallel navigation technique was significantly greater than that of those that used a sequential navigation interactivity technique. The results regarding the efficacy of image abstraction and transition effects varied by task. For one task, decision quality was significantly greater for subjects that used realistic as opposed to abstract images, but decision quality did not vary by transition effect. For the other task, decision quality was significantly greater for subjects that used gradual as compared to abrupt transition, but image abstraction had no effect on decision quality.  相似文献   
995.
Many study designs yield a variety of outcomes from each subject clustered within an experimental unit. When these outcomes are of mixed data types, it is challenging to jointly model the effects of covariates on the responses using traditional methods. In this paper, we develop a Bayesian approach for a joint regression model of the different outcome variables and show that the fully conditional posterior distributions obtained under the model assumptions allow for estimation of posterior distributions using Gibbs sampling algorithm.  相似文献   
996.
An omnibus spending bill in 2014 directed the Department of Energy to analyze how effectively Department of Energy (DOE) identifies, programs, and executes its plans to address public health and safety risks that remain as part of DOE's remaining environmental cleanup liabilities. A committee identified two dozen issues and associated recommendations for the DOE, other federal agencies, and the U.S. Congress to consider, as well as other stakeholders such as states and tribal nations. In regard to risk assessment, the committee described a risk review process that uses available data, expert experience, identifies major data gaps, permits input from key stakeholders, and creates an ordered set of risks based on what is known. Probabilistic risk assessments could be a follow‐up from these risk reviews. In regard to risk management, the states, in particular, have become major drivers of how resources are driven. States use different laws, different priorities, and challenge DOE's policies in different ways. Land use decisions vary, technology choices are different, and other notable variations are apparent. The cost differences associated with these differences are marked. The net result is that resources do not necessarily go to the most prominent human health and safety risks, as seen from the national level.  相似文献   
997.
The paper used time-series data and examined the effect of economic and social variables on the male and female self-employment rates in Spain. We also employed cointegration analysis (with and without) structural breaks. We thus find strong evidence that long run relationships exist among the variables. More precisely, we find that the unemployment rates and the ratio of self-employment to employees’ earnings have a positive effect on self-employment, whereas, economic development and divorce rates have a negative effect. Importantly, we find that the economic variables have equal or stronger long run impact on females than males, with both groups reacting to changes in family circumstances. Finally, we show that the short run family circumstances are better predictors of self-employment choices rather than economic factors, with self-employment being a means of adjustment to new personal circumstances and economic needs.  相似文献   
998.
Secondary sources are used in this paper to highlight how African Caribbean pupils and students – the Black British-born descendants of post-war Caribbean migrants – are victims of symbolic violence, because they are denied the educational capital needed to improve their social status. Since African Caribbean children entered the 1960s British educational sector, their learning has been perceived as problematic by the State. Although assimilation, integration and multicultural education policies were implemented to supposedly address the ‘problem’ of educating Black children, subsequent government reports identified racism as a significant barrier in their education. I argue here that the contemporary marketisation of education makes it increasingly difficult to distinguish between racism and competition, as causal factors of ethnic differences in educational attainment. Moreover, due to increasing private sector intervention and decreasing mediation by the State, racism is now hidden within the vicissitudes of the educational market. School exclusions and discriminatory practices in universities are viewed in this paper as major barriers to the economic success and future social mobility of Black Caribbean pupils and students. I conclude by suggesting that marketisation policies can be appropriated to ameliorate racism in education, but only if the political will to do so exists.  相似文献   
999.
The World Health Organization has declared antibiotic resistance “one of the biggest threats to global health.” Mounting evidence suggests that antibiotic use in industrial-scale hog farming is contributing to the spread of antibiotic-resistant Staphylococcus aureus. To capture available evidence on these risks, we searched peer-reviewed studies published before June 2017 and conducted a meta-analysis of these studies’ estimates of the prevalence of swine-associated, antibiotic-resistant S. aureus in animals, humans, and the environment. The 166 relevant studies revealed consistent evidence of livestock-associated methicillin-resistant S. aureus (MRSA) in hog herds (55.3%) raised with antibiotics. MRSA prevalence was also substantial in slaughterhouse pigs (30.4%), industrial hog operation workers (24.4%), and veterinarians (16.8%). The prevalence of swine-associated, multidrug-resistant S. aureus (MDRSA)—with resistance to three or more antibiotics—is not as well documented. Nonetheless, sufficient studies were available to estimate MDRSA pooled prevalence in conventional hog operation workers (15.0%), workers’ household members (13.0%), and community members (5.37%). Evidence also suggests that antibiotic-resistant S. aureus can be present in air, soil, water, and household surface samples gathered in or near high-intensity hog operations. An important caveat is that prevalence estimates for humans reflect colonization, not active infection, and the health risks of colonization remain poorly understood. In addition, these pooled results may not represent risks in specific locations, due to wide geographic variation. Nonetheless, these results underscore the need for additional preventive action to stem the spread of antibiotic-resistant pathogens from livestock operations and a streamlined reporting system to track this risk.  相似文献   
1000.
Commercially available wearable devices are marketed as a means of objectively capturing daily sleep easily and inexpensively outside of the laboratory. Two ecological momentary assessment studies—with 120 older adolescents (aged 18–19) and 395 younger adolescents (aged 10–16)—captured nightly self‐reported and wearable (Jawbone) recorded sleep duration. Self‐reported and wearable recorded daily sleep duration were moderately correlated (r ~ .50), associations which were stronger on weekdays and among young adolescent boys. Older adolescents self‐reported sleep duration closely corresponded with estimates from the wearable device, but younger adolescents reported having an hour more of sleep, on average, compared to device estimates. Self‐reported, but not wearable‐recorded, sleep duration and quality were consistently associated with daily well‐being measures. Suggestions for the integration of commercially available wearable devices into future daily research with adolescents are provided.  相似文献   
设为首页 | 免责声明 | 关于勤云 | 加入收藏

Copyright©北京勤云科技发展有限公司  京ICP备09084417号