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   2307篇
  免费   37篇
  国内免费   1篇
教育   1538篇
科学研究   276篇
各国文化   17篇
体育   189篇
综合类   9篇
文化理论   11篇
信息传播   305篇
  2022年   23篇
  2021年   20篇
  2020年   28篇
  2019年   49篇
  2018年   50篇
  2017年   82篇
  2016年   70篇
  2015年   61篇
  2014年   74篇
  2013年   405篇
  2012年   59篇
  2011年   65篇
  2010年   53篇
  2009年   38篇
  2008年   47篇
  2007年   48篇
  2006年   38篇
  2005年   32篇
  2004年   41篇
  2003年   35篇
  2002年   31篇
  2001年   27篇
  2000年   42篇
  1999年   55篇
  1998年   21篇
  1996年   21篇
  1995年   16篇
  1994年   15篇
  1993年   16篇
  1992年   23篇
  1991年   34篇
  1990年   45篇
  1989年   34篇
  1988年   30篇
  1987年   22篇
  1986年   34篇
  1985年   39篇
  1984年   35篇
  1983年   30篇
  1982年   26篇
  1981年   22篇
  1980年   21篇
  1979年   28篇
  1978年   30篇
  1977年   22篇
  1976年   18篇
  1974年   17篇
  1971年   17篇
  1968年   19篇
  1967年   15篇
排序方式: 共有2345条查询结果,搜索用时 15 毫秒
71.
The present study looked at whether special education placement decisions made by teams are superior to those made by individuals. The investigation was conducted in Puerto Rico to determine whether the benefits of the cooperative group process exist in another culture. Results indicated that teams in Puerto Rico generated significantly less variability (i.e., errors) in their placement decisions than did the same specialists acting independently.  相似文献   
72.
73.
A 64-year-old security guard and longstanding known hypertensive presented with hypertensive heart disease (HHD), weight loss, an enlarged prostate, and a spontaneously fractured rib. Malignancy of the prostate with possible metastases to the ribs was strongly suspected. Biochemical profiling revealed a paraprotein. Other biochemical and hematological correlates that were on hand before serum protein electrophoresis were rather atypical. Paraprotein studies by immunofixation revealed IgA myelomatosis. Unlike previous reports from Caucasians there was normocalcaemia, normal protein level, microcytic hypochromia, low MCHC, cholesterol level at the lower limit of the reference range and normal urea level (in the face of markedly raised creatinine level). Nutritional modulation of the classical laboratory features of this disease may account for the fairly atypical laboratory picture. The need to appreciate the influence of nutritional status on the laboratory (especially biochemical) features of a disease and thus interpretation of diagnostic tests appears of exceptional current importance, given the widening gap in socioeconomic status and the level of poverty between the resource poor and developed countries from which the classical, clinical and laboratory features of most diseases were first described. This case report reminds of the need not only to recognize theoretically the impact of nutritional status on the laboratory characteristics of a disease but of the practical application of the nutritional perspective in the interpretation of diagnostic investigations, especially in nutritionally disadvantaged communities.  相似文献   
74.
Higher-order statistics (HOS) are well known for their robustness to additive Gaussian noise and ability to preserve phase. HOS estimates, on the other hand, have been criticized for high complexity and the need for long data in order to maintain small variance. Since rank reduction offers a general principle for reduction of estimator variance and complexity, we consider the problem of designing low-rank estimators for HOS. We propose three methods for choosing the transformation matrix that reduces the mean-square error (MSE) associated with the low-rank HOS estimates. We also demonstrate the advantages of using low-rank third-order moment estimates for blind system estimation. Results indicate that the full rank MSE corresponding to some data length N can be attained by a low-rank estimator corresponding to a length significantly smaller than N.  相似文献   
75.
Superhero play is a specialised form of fantasy play with considerable appeal to young children. During superhero play, children have opportunities to pretend and often to play different types of roles within a safe and caring environment. When guided appropriately in an early childhood classroom, superhero play gives young children opportunities to gain a sense of mastery and empowerment as well as developmentally appropriate benefits by improving language skills, problem-solving and cooperation with peers. By recognising and modelling the characteristics of resiliency and promoting kindness with peers during superhero play, teachers can encourage children to be kind and resilient heroes to classroom friends. As today’s classrooms increasingly include diverse members, it is important for young children to understand and appreciate the peers they play and learn with at school. The result may be a richer learning experience and may break down barriers that can produce unfairness, bullying and aggressive behaviours. This article explores the essence of superhero fantasy play along with its benefits for young children. In addition, the article examines the challenge of superhero play in classrooms for early childhood educators by exploring teachers’ roles in play. A new pedagogy for supporting superhero play is introduced, addressing spiritual and educational concerns by suggesting ways in which teachers can increase resiliency, encourage new friendships and build classroom community among peers during play and classroom activities.  相似文献   
76.
The purpose of this study was to examine the extent to which three teachers’ professional experience and existing orientations toward teaching and learning mathematics and science influenced their implementation of a project-based curriculum (i.e. project-based learning (PBL)). Data sources included interviews, videotapes of classroom activity, and a teaching philosophy questionnaire. Data analysis was conducted using an iterative coding technique. We found coherency between the teachers’ perceived orientations and their emergent ideas about PBL, their sense of PBL as being compatible with their goals, and the specific challenges with which they struggled. All the teachers wanted their students to be successful; however, different definitions of success led to quite different approaches toward teaching, and for the most part, these differences appeared to have occurred because of existing orientations the teachers held for teaching their discipline. Implications for professional development taking into account teachers’ orientations and thus their professional experience are discussed, as well as disciplinary challenges to using PBL.  相似文献   
77.
This paper describes and assesses the effectiveness of the Meyerhoff Scholars Program at the University of Maryland, Baltimore County (UMBC). The Program is designed to increase the number of underrepresented minorities who pursue graduate and professional degrees in science and engineering. Until 1996 the program admitted African American students exclusively, and the current study focuses only on students from that group. The Meyerhoff students have achieved higher grade point averages, graduated in science and engineering at higher rates, and gained admittance to graduate schools at higher rates than multiple current and historical comparison samples. Student survey and interview data revealed that a number of program components were viewed as being especially important contributors to students' academic success: Program Community, Study Groups, Summer Bridge Program, Financial Support, Program Staff, and Research Internships and Mentors. © 2000 John Wiley & Sons, Inc. J Res Sci Teach 37: 629–654, 2000  相似文献   
78.
Advancement of knowledge and progress in technology drives the need for protecting inventions, new ideas, writings, music, and other media. While abundant, intellectual property and copyright issues are not simple, and the United States has adopted multiple rules via treaties worldwide. Academia has been fortunate with regard to the freedom provided by the fair use doctrine. Despite the freedoms, however, some feel that liberty is now limited by the Digital Millennium Copyright Act of 1998 (DMCA) and other rules being placed on intellectual property use (Carlson 2004).  相似文献   
79.

More than 75 percent of post‐secondary institutions offering education programs in prisons are community and vocational/ technical colleges. The predominance of community colleges among correctional education providers is a major change from the early 1970's when two‐thirds of such programs were provided by four‐year institutions.

Over 260 community colleges provide programs and services to the 26,000 inmates participating in higher education. Results of a survey on correctional post‐secondary education indicate that these programs are in many ways different from those educational institutions provide on their own campuses. For example, they generally, have different admission standards, are administered by part‐time staff, and rely upon part‐time and adjunct faculty.

Community and junior college administrators are urged to closely examine the operation and quality of their correctional programs and the need for evaluative research on the long‐term effects of these programs is also stressed.  相似文献   
80.

Rigoberta Menchú has become an icon for the struggles of oppressed peoples for justice and self-determination. For many academics and activists around the world, the accusations of lying made against Ms. Menchú by David Stoll brought into sharp focus the politics of "truthmaking" and the absolutist categories of fact and fiction. In this attempt to discredit Ms. Menchú, and through her, the Mayan experience of genocide by the Guatemalan military and its U.S. sponsors, important questions have been raised about how and when Third World women can speak, the conditions under which they will be heard, and the strategies used to silence them. In this paper, the author draws upon some of the lessons of the Rigoberta Menchú case to examine the politics of truth making in Canada in a recent controversy regarding a speech she made criticizing American foreign policy and urging the women's movement to mobilize against America's War on Terrorism. The highly personalized nature of the attacks on the author by political and media elites sought to accomplish a closing down of public space for informed debate about the realities of U.S. foreign policy and to silence dissent. Repeatedly emphasizing her status as an immigrant outsider, this controversy also contributed to the (ongoing) racialization of people of color as a treacherous "enemy" within the nation's geographical borders, against whom "Canadians" had to be mobilized.  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