全文获取类型
收费全文 | 22256篇 |
免费 | 257篇 |
国内免费 | 12篇 |
专业分类
教育 | 15737篇 |
科学研究 | 2169篇 |
各国文化 | 401篇 |
体育 | 1709篇 |
综合类 | 11篇 |
文化理论 | 141篇 |
信息传播 | 2357篇 |
出版年
2021年 | 180篇 |
2020年 | 261篇 |
2019年 | 412篇 |
2018年 | 542篇 |
2017年 | 580篇 |
2016年 | 514篇 |
2015年 | 330篇 |
2014年 | 445篇 |
2013年 | 4031篇 |
2012年 | 473篇 |
2011年 | 533篇 |
2010年 | 380篇 |
2009年 | 371篇 |
2008年 | 531篇 |
2007年 | 425篇 |
2006年 | 466篇 |
2005年 | 347篇 |
2004年 | 357篇 |
2003年 | 283篇 |
2002年 | 315篇 |
2001年 | 450篇 |
2000年 | 436篇 |
1999年 | 396篇 |
1998年 | 206篇 |
1997年 | 233篇 |
1996年 | 237篇 |
1995年 | 235篇 |
1994年 | 196篇 |
1993年 | 236篇 |
1992年 | 352篇 |
1991年 | 340篇 |
1990年 | 336篇 |
1989年 | 366篇 |
1988年 | 343篇 |
1987年 | 306篇 |
1986年 | 304篇 |
1985年 | 360篇 |
1984年 | 300篇 |
1983年 | 339篇 |
1982年 | 259篇 |
1981年 | 233篇 |
1980年 | 232篇 |
1979年 | 347篇 |
1978年 | 258篇 |
1977年 | 234篇 |
1976年 | 223篇 |
1975年 | 197篇 |
1974年 | 204篇 |
1973年 | 194篇 |
1971年 | 169篇 |
排序方式: 共有10000条查询结果,搜索用时 15 毫秒
951.
952.
Secondary data analysis was used to develop and examine disability-related differences in outcome constructs from the National Longitudinal Transition Study-2. Findings suggest that outcome constructs could be created that represented key elements of quality of life domains including social relationships, financial independence, financial supports, employment, emotional well-being, postsecondary education, independent living, health status, access to services, and advocating for needs. The constructs could be measured equivalently across disability groups, but young adults with high incidence disabilities, generally, experienced more positive outcomes than those with more severe disabilities, despite the finding that those with more severe disabilities have greater access to services and financial supports. Implications for future research and practice are discussed. 相似文献
953.
Michael Bohl Alexis Holman Dean A. Mueller Larry D. Gruppen Sabine Hildebrandt 《Anatomical sciences education》2013,6(2):90-100
The Anatomical Donations Program at the University of Michigan Medical School (UMMS) has begun a multiphase project wherein interviews of donors will be recorded and later shown to medical students who participate in the anatomical dissection course. The first phase of this project included surveys of both current UMMS medical students and donors concerning their perceptions of such a program. A five‐question survey administered via Qualtrics software was electronically mailed to all current medical students at UMMS, and a survey was mailed to registered and potential donors requesting information from the UMMS on anatomical donations. A total of 224 medical student responses (response rate 33%) and 54 donor responses (response rate 27%) were received. Seventy‐four percent of students and 81% of donors reported they would participate in this program if it existed. Students and donors supported the implementation of this program for varying reasons, though many felt strongly they would not want to participate in a donor interview program. These qualitative results support those of previous studies that show a majority of students desire a closer personal relationship with the donor, and these are the first results to be reported on donor perceptions of a donor interview program. Although many students and donors are in favor of instituting this program, others feel strongly that such an experience could be traumatic. The causes of these differing reactions need to be further explored, and the opinions of those who object to this study will be respected by maintaining voluntary participation in future phases of this study. Anat Sci Educ 6: 90–100. © 2012 American Association of Anatomists. 相似文献
954.
Past research concerning the theoretical framework of Resistance Performance (RP) has been based on observations of liberal organizations and activists. In the following essay, we engage in a qualitative content analysis of alternative media utilized by conservative “Tea Party” activists to build on the concept of RP. Overall, we discovered that the dominant theme found in much of the content focuses on “purity,” which is considerably different from past RP research that found broad themes of “human rights,” “democracy,” “be the media,” and “principles of unity” embedded within liberal alternative media content. We conclude that the theme of “purity” gives rise to narrowmobilization, which constructs very focused protest communities within right-leaning politics. 相似文献
955.
956.
Research Findings: As policymakers expand access to preschool, the sociodemographic composition of preschool classrooms will become increasingly important. These efforts may create programs that increase the concentration of children from low-income families or, alternatively, foster the creation of socioeconomically diverse preschool classrooms. What effect the creation of such contexts would have on very young children remains unclear. Using multilevel methods and data on 2,966 children in 704 prekindergarten classrooms, this study explores the relationship between socioeconomic classroom composition and children's social and cognitive development. The results indicate positive associations between the mean socioeconomic status (SES) of the class and children's receptive language, expressive language, and mathematics learning, regardless of children's own sociodemographic backgrounds and the characteristics of their classrooms. However, the analyses indicate no association between the development of social competence and class mean SES. Practice or Policy: The links between classroom SES and language and mathematics development were comparable in size to those associated with instructional quality and even children's own SES. Neither structural nor instructional characteristics of prekindergarten classrooms explained these relationships, suggesting the possibility of direct peer effects. The findings indicate that the composition of children's classrooms should be considered an important aspect of preschool quality. 相似文献
957.
Sofia Börjesson 《Action Learning: Research and Practice》2011,8(3):187-209
This paper aims to make a contribution to the stream of literature on action research by describing a longitudinal collaborative research project which evolved out of a long-term, participation partnership with Volvo Cars. The collaboration was aimed at developing innovation capabilities in the company and accumulating knowledge on how capabilities are developed. The paper provides insights into the design of collaborative research projects to enable mutual, sustainable learning. It draws on key notions in the literature on collaborative management research and action learning, highlighting the research design of the project at Volvo Cars and its relations to action learning. The paper describes how the research design opened the way to establishing a learning system at Volvo Cars while simultaneously generating new scientific knowledge within the area of innovation capabilities. The paper provides rich and detailed data on a collaborative research setting and highlights key aspects related to organizing and undertaking collaborative research. 相似文献
958.
A. Lleó D. Agholor N. Serrano V. Prieto-Sandoval 《European Journal of Engineering Education》2018,43(5):706-724
This article describes an action research (AR) project for designing and implementing a structured mentoring programme in a Spanish university. A student affairs unit, a team of researchers, faculty-mentors and student-protégés worked together on three cycles of AR. The result is a programmatic mentoring programme for the development of non-technical personal and professional competencies for undergraduate students. This paper describes the original situation that sparked the project, the iterative process followed, the tools and guides developed and the final programme designed. In addition to the increase in the level of satisfaction perceived by the entire university, the paper outlines the five critical factors that emerged from the AR project: the competency development process, programme value added, trust between mentors and protégés, the prominence of the student-protégé in the improvement plans and the continuous improvement culture generated. 相似文献
959.
In this paper we describe how progressive download and adaptive streaming can be combined into a simple and efficient streaming framework. Based on the MPEG-4 file format (MP4) we use HTTP for transport and argue that these two components are sufficient for specifying an open streaming architecture. The client selects appropriate chunks from the MP4 file to be transferred based on (1) the header information (i.e. the “moov” box) in the first part of the file and (2) his observation of network throughput. The framework is completely client driven which allows for better server scalability and reduces signalling overhead. We discuss architecture and implementation issues such as complexity, interoperability and scalability and compare to 3GPP PSS Rel-6 adaptive streaming when appropriate. Measurements from a simple MP4/HTTP streaming client are presented showing that appropriate chunks are selected such that increased reliability is achieved. 相似文献
960.