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   650篇
  免费   59篇
  国内免费   1篇
  710篇
  2023年   4篇
  2022年   3篇
  2021年   14篇
  2020年   23篇
  2019年   28篇
  2018年   36篇
  2017年   31篇
  2016年   27篇
  2015年   27篇
  2014年   34篇
  2013年   73篇
  2012年   35篇
  2011年   38篇
  2010年   38篇
  2009年   39篇
  2008年   28篇
  2007年   22篇
  2006年   22篇
  2005年   19篇
  2004年   19篇
  2003年   15篇
  2002年   15篇
  2001年   6篇
  2000年   6篇
  1999年   6篇
  1998年   5篇
  1997年   3篇
  1996年   5篇
  1994年   4篇
  1993年   3篇
  1991年   4篇
  1990年   5篇
  1989年   4篇
  1987年   3篇
  1986年   3篇
  1985年   3篇
  1983年   3篇
  1981年   5篇
  1980年   3篇
  1979年   2篇
  1977年   4篇
  1976年   2篇
  1975年   3篇
  1974年   3篇
  1972年   2篇
  1969年   2篇
  1967年   2篇
  1964年   4篇
  1960年   2篇
  1959年   2篇
排序方式: 共有710条查询结果,搜索用时 15 毫秒
51.
Little is known about research misconduct within industry and how it compares to universities, even though a lot of biomedical research is performed by–or in collaboration with–commercial entities. Therefore, we sent an e-mail invitation to participate in an anonymous computer-based survey to all university researchers having received a biomedical research grant or scholarship from one of the two national academic research funders of Belgium between 2010 and 2014, and to researchers working in large biomedical companies or spin-offs in Belgium. The validated survey included questions about various types of research misconduct committed by respondents themselves and observed among their colleagues in the last three years. Prevalences of misconduct were compared between university and industry respondents using binary logistic regression models, with adjustments for relevant personal characteristics, and with significance being accepted for p < 0.01. The survey was sent to 1766 people within universities and an estimated 255 people from industry. Response rates were 43 (767/1766) and 48% (123/255), and usable information was available for 617 and 100 respondents, respectively. In general, research misconduct was less likely to be reported by industry respondents compared to university respondents. Significant differences were apparent for one admitted action (gift authorship) and three observed actions (plagiarism, gift authorship, and circumventing animal-subjects research requirements), always with lower prevalences for industry compared to universities, except for plagiarism. This survey, based on anonymous self-report, shows that research misconduct occurs to a substantial degree among biomedical researchers from both industry and universities.  相似文献   
52.
53.

Diverse adaptive visual processing mechanisms allow us to complete visual search tasks in a wide visual photopic range (>0.6 cd/m2). Whether search strategies or mechanisms known from this range extend below, in the mesopic and scotopic luminance spectra (<0.6 cd/m2), has yet to be addressed. Based on a study that addressed simple target discrimination in luminance environments using contrast-dependent behavioral efficiency functions, we assessed visual search in more complex-feature and conjunction-search paradigms. The results verify the previously reported deficiency windows defined by an interaction of base luminance and luminance contrast for more complex visual-search tasks. Based on significant regression analyses, a more precise definition of the magnitude of contribution of different contrast parameters. Characterized feature search patterns had approximately a 2.5:1 ratio of contribution from the Michelson contrast property relative to Weber contrast, whereas the ratio was approximately 1:1 in a serial-search condition. The results implicate near-complete magnocellular isolation in a visual-search paradigm that has yet to be demonstrated. Our analyses provide a new method of characterizing visual search and the first insight in its underlying mechanisms in luminance environments in the low mesopic and scotopic spectra.

  相似文献   
54.
55.
Ben Cross 《Ratio》2018,31(Z1):81-95
Many political realists reject the idea that the first task for political philosophy is to justify the existence of coercive political institutions (CPIs). Instead, they say, we should begin with the factual existence of CPIs, and ask how they ought to be structured. In holding this view, they adopt a form of political naturalism that is broadly Aristotelian in character. In this article, I distinguish between two forms that this political naturalism might take ‐ what I call a ‘strong’ form, and a ‘weak’ form ‐ and argue that both ought to be rejected. 1  相似文献   
56.
Growing up in religious/spiritual communities often creates identity issues for lesbian and gay individuals. In this phenomenological study, the authors investigated the experiences of 25 lesbian and gay individuals who self‐identified as having been raised within organized religious communities. Participants described that these communities were affirming, tolerant, or nonaffirming. Accordingly, emergent themes indicated that the current spiritual lives of participants varied greatly depending on their experiences of identity integration and affirmation. Implications for counselors and researchers are discussed.  相似文献   
57.
58.
59.
60.
In education, character education is a burgeoning field; however, it is also the target of considerable criticism. Amongst criticisms of character education, the political criticism that character education is a form of indoctrination stands out. In particular, the charge is made against character education that it breaches the principle of liberal neutrality about the good. In this article I discuss liberal approaches to character education. I outline the two most prominent liberal approaches to character education in school, liberal neutralism and liberal perfectionism, as we find it in the work of Clayton (neutralism) and Levinson (liberal perfectionism). I hold that the two standard liberal approaches do not distinguish carefully enough between two possible forms of character education – moral character education and intellectual character education. Drawing on recent work in virtue epistemology, I hold that the liberal position tacitly demands intellectual character education. Regarding moral character education, however, I hold that the picture appears different. In the final analysis, I advocate a new form of perfectionism regarding character education that I call ‘intellectual perfectionism’. According to intellectual perfectionism, schools should be perfectionist regarding children's intellects, but neutralist regarding their morals.  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