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   3014篇
  免费   56篇
  国内免费   2篇
教育   2388篇
科学研究   120篇
各国文化   38篇
体育   114篇
综合类   1篇
文化理论   22篇
信息传播   389篇
  2023年   14篇
  2022年   26篇
  2021年   40篇
  2020年   74篇
  2019年   89篇
  2018年   134篇
  2017年   136篇
  2016年   127篇
  2015年   71篇
  2014年   106篇
  2013年   760篇
  2012年   78篇
  2011年   72篇
  2010年   65篇
  2009年   76篇
  2008年   77篇
  2007年   70篇
  2006年   69篇
  2005年   68篇
  2004年   64篇
  2003年   37篇
  2002年   43篇
  2001年   34篇
  2000年   28篇
  1999年   42篇
  1998年   34篇
  1997年   37篇
  1996年   45篇
  1995年   25篇
  1994年   31篇
  1993年   30篇
  1992年   25篇
  1991年   17篇
  1990年   22篇
  1989年   11篇
  1988年   18篇
  1987年   24篇
  1986年   24篇
  1985年   22篇
  1984年   18篇
  1983年   18篇
  1982年   25篇
  1981年   12篇
  1980年   12篇
  1979年   22篇
  1977年   20篇
  1975年   17篇
  1974年   14篇
  1973年   12篇
  1969年   11篇
排序方式: 共有3072条查询结果,搜索用时 15 毫秒
241.
242.
This paper examines how the role of patents and utility models in innovation and economic growth varies by level of economic development. Using a panel dataset of over 70 countries, we find that patent protection is an important determinant of innovation and that patentable innovations contribute to economic growth in developed countries, but not in developing. Instead, in developing economies, a minor form of intellectual property rights (IPRs) - namely utility models - is conducive to innovation and growth, controlling for other factors. Using Korean firm level data as a case study, we find that utility model innovations contribute to firm performance when firms are technologically lagging and that those minor innovations can be a learning device and thus a stepping stone for developing more patentable inventions later on. Upon reaching higher levels of technological capabilities, firms become more reliant upon patents and less on utility models. Thus the lesson here is that patent protection enhances innovation and economic growth in countries where the capacity to conduct innovative research exists. Where this capacity is weaker, a system that provides incentives to conduct minor, incremental inventions is more conducive to growth. The significance of this paper is to emphasize the importance not just of the strength of IPRs but of the appropriate type of IPRs for economic development.  相似文献   
243.
In Experiment 1, a potentiation paradigm was used to test the relative influence of odor and taste with two 2 basic tastants (i.e., salt and sweet) in conditioned aversion learning. Experiment 1 showed that aversions to tastants (salt or sweet presented in a manner by which it could be tasted) were established only in subjects trained with the tastant, not the odor (i.e., salt or sweet presented in a manner by which it could not be tasted). Experiment 2 demonstrated, with a sensory preconditioning procedure, that the expression of an aversion to tastants was dependent on previous tastant experience prior to odor aversion training. These results suggest that while subjects can smell salt and sweet solutions, these odors are neither sufficient nor necessary for the expression of a conditioned tastant aversion.  相似文献   
244.
OBJECTIVE: The aim of this study was to examine the impact of childhood sexual abuse (CSA) on clinical characteristics and premature termination of treatment in anorexia nervosa (AN). METHOD: The participants were 77 consecutive patients with AN admitted to an inpatient eating disorders unit. The patients were assessed in terms of eating disorder symptoms, general psychopathology, and CSA history at admission to hospital. RESULTS: Thirty-seven patients (48%) reported a history of CSA before the onset of the eating disorder. Individuals with a history of CSA reported significantly greater psychiatric comorbidity, including higher levels of depression and anxiety, lower self-esteem, more interpersonal problems, and more severe obsessive-compulsive symptoms. Patients with the binge-purge subtype of AN (AN-BP) were significantly more likely to report a history of CSA prior to the onset of the eating disorder as compared with patients with the restricting subtype (AN-R) of the illness (65% of the AN-BP patients vs. 37% of the AN-R patients; p<.02). Contrary to our predictions, abused patients were not significantly more likely to dropout of treatment overall. However, patients of the binge-purge subtype (AN-BP) with a history of CSA were significantly more likely to terminate treatment prematurely as compared with the other patients. CONCLUSIONS: Consistent with previous findings, the present results indicate that the prevalence of CSA is high among individuals seeking inpatient treatment for AN. A history of CSA was associated with greater psychiatric disturbance overall and a higher rate of dropout for patients of the binge-purge subtype.  相似文献   
245.
ABSTRACT

This article is situated in the context of an intensified discourse within which academic developers are being asked to provide evidence of impact, and argues that theoretical models currently used are imprecise and fail to capture the variation in outcomes from professional development activities. Through reference to previous research on how teachers' thinking can be described in relation to various thinking-zones, and how teachers notice and respond to signs of student learning, we suggest a more fine-grained perspective. Furthermore, we argue that improved models for design and evaluation of professional development might prove crucial for academic development as a profession.  相似文献   
246.
In this paper, we identify beliefs about teaching and patterns of instruction valued and emphasized by science, technology, engineering, and mathematics faculty in higher education in the USA. Drawing on the notion that effective teaching is student-centered rather than teacher-centered and must include a balance of knowledge-, learner-, community-, and assessment-centered learning environments; we use qualitative interview data to explore how faculty's reported beliefs about teaching are associated with their consideration of these four types of environments. Findings indicated that although a range of beliefs about teaching emerged, most were firmly located in knowledge-centered learning environments, with little or no focus on the remaining three learning environments. Furthermore, even patterns of instruction that were heavily student-centered were situated within a knowledge-centered learning framework. We argue that for student-centered instruction to be truly successful, faculty must consider all four learning environments in crafting and facilitating the classroom environment.  相似文献   
247.
Researchers in the educational field have investigated how a caring adult can best provide mentoring support to youth placed at risk and what functions a mentoring program should serve to promote healthy mentoring relationships. However, the perspective of mentors rarely has been sought to elicit their evaluation of a mentoring program or recommendations for programmatic change. The purpose of this article was to investigate the views of university students serving as mentors in high‐need high schools or community centers. We asked 49 students, primarily undergraduates across a range of liberal arts disciplines, who were participating in a university‐based service‐learning mentoring program for youth attending high‐poverty high schools: (a) what activities they engaged in with mentees, (b) how they benefited from the mentoring program, and (c) how they perceived the program and what recommendations they had for change. Findings revealed specific suggestions that mentoring program coordinators can adopt to address mentors’ concerns and promote sustained, durable mentoring relationships for youth.  相似文献   
248.
We investigated the impact of introducing college students to complex adaptive systems on their subsequent mental models of evolution compared to those of students taught in the same manner but with no reference to complex systems. The students' mental models (derived from similarity ratings of 12 evolutionary terms using the pathfinder algorithm) were significantly similar to their teachers' mental models and were correlated to their performance on an essay on evolution. Introducing students to complex systems facilitated their understanding of the mechanism of inheritance, the mechanism of evolution, and the role of chance in evolution.  相似文献   
249.
This paper uses a case study approach to examine how the heteronormative nature of one middle school setting and classroom environment shapes the climate of safety, support and learning for LGBTQ students when they are engaged in studying a novel with a gay character. Heteronormative environments inform and shape positioning of and by students and teacher, impacting how knowledge is created, processed and applied. LGBTQ literature integrated into the classroom curriculum invites opportunities for possibilities through windows and mirrors for exploration of the world and self. Heteronormativity, positioning and LGBTQ literature thereby become interactive catalysts that create and foreclose possibilities and impossibilities for student learning. Three themes emerged from the study that reveal positioning and possibilities when studying a text with a gay character: (1) the school environment and classroom context positioned students as heterosexual; (2) students and teacher positioned gender performance and sexual identity as other; and (3) while the text acted as both a window and a mirror, the teacher and students consistently framed different, and sometimes contradictory, views for each other. Together, these themes reflect a nested understanding of gender performance and sexual identity that subscribed to heterosexual norms and limited possibilities for LGBTQ students.  相似文献   
250.
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