全文获取类型
收费全文 | 1387篇 |
免费 | 24篇 |
国内免费 | 1篇 |
专业分类
教育 | 1074篇 |
科学研究 | 92篇 |
各国文化 | 19篇 |
体育 | 96篇 |
综合类 | 1篇 |
文化理论 | 13篇 |
信息传播 | 117篇 |
出版年
2023年 | 4篇 |
2022年 | 20篇 |
2021年 | 29篇 |
2020年 | 38篇 |
2019年 | 40篇 |
2018年 | 55篇 |
2017年 | 72篇 |
2016年 | 70篇 |
2015年 | 38篇 |
2014年 | 41篇 |
2013年 | 283篇 |
2012年 | 44篇 |
2011年 | 37篇 |
2010年 | 41篇 |
2009年 | 28篇 |
2008年 | 44篇 |
2007年 | 39篇 |
2006年 | 32篇 |
2005年 | 36篇 |
2004年 | 38篇 |
2003年 | 28篇 |
2002年 | 29篇 |
2001年 | 22篇 |
2000年 | 21篇 |
1999年 | 18篇 |
1998年 | 12篇 |
1997年 | 8篇 |
1996年 | 10篇 |
1995年 | 9篇 |
1994年 | 13篇 |
1993年 | 16篇 |
1992年 | 8篇 |
1991年 | 10篇 |
1990年 | 13篇 |
1989年 | 13篇 |
1988年 | 7篇 |
1987年 | 15篇 |
1986年 | 5篇 |
1985年 | 15篇 |
1984年 | 8篇 |
1983年 | 5篇 |
1982年 | 6篇 |
1979年 | 8篇 |
1977年 | 6篇 |
1976年 | 10篇 |
1974年 | 4篇 |
1971年 | 4篇 |
1885年 | 5篇 |
1882年 | 4篇 |
1880年 | 5篇 |
排序方式: 共有1412条查询结果,搜索用时 31 毫秒
81.
Vicky Vandenbossche Joris Van de Velde Stind Avet Wouter Willaert Stian Soltvedt Noeska Smit Emmanuel Audenaert 《Anatomical sciences education》2022,15(4):731-744
High-fidelity anatomical models can be produced with three-dimensional (3D) scanning techniques and as such be digitally preserved, archived, and subsequently rendered through various media. Here, a novel methodology—digital body preservation—is presented for combining and matching scan geometry with radiographic imaging. The technique encompasses joining layers of 3D surface scans in an anatomical correct spatial relationship. To do so, a computed tomography (CT) volume is used as template to join and merge different surface scan geometries by means of nonrigid registration into a single environment. In addition, the use and applicability of the generated 3D models in digital learning modalities is presented. Finally, as computational expense is usually the main bottleneck in extended 3D applications, the influence of mesh simplification in combination with texture mapping on the quality of 3D models was investigated. The physical fidelity of the simplified meshes was evaluated in relation to their resolution and with respect to key anatomical features. Large- and medium-scale features were well preserved despite extensive 3D mesh simplification. Subtle fine-scale features, particular in curved areas demonstrated the major limitation to extensive mesh size reduction. Depending on the local topography, workable mesh sizes ranging from 10% to 3% of the original size could be obtained, making them usable in various learning applications and environments. 相似文献
82.
Combining both interview data and empirical analyses at the patent and firm levels, we explore the value-appropriation and value-creation implications of R&D collaboration resulting in the co-ownership of intellectual property (i.e. co-patents). We make an explicit distinction between three different types of co-patenting partners: intra-industry partners, inter-industry partners, and universities. Our findings indicate that the value-appropriation challenges of IP sharing are clearly evident with intra-industry co-patenting, where partners are more likely to encounter overlapping exploitation domains. Co-patenting with universities is associated with higher market value, since appropriation challenges are unlikely to play a role and collaboration may signal novel technological opportunities. Although we find some evidence that co-patenting corresponds to higher (patent) value, patents co-owned with firms are significantly less likely to receive self-citations, indicating constraints on the future exploitation and development of co-owned technologies. 相似文献
83.
Lucyna Samek Anna De Maeyer-Worobiec Zoya Spolnik Lszl Bencs Velichka Kontozova ukasz Bratasz Roman Kozowski Ren Van Grieken 《Journal of Cultural Heritage》2007,8(4):361-369
The impact of electric overhead radiant heaters on the microclimate, air flows, transport and deposition of suspended particulate matter (SPM) was monitored between March 2004 and March 2005 in the historic churches of Saint Michael Archangel in Szalowa and Saint Catherine in Cracow (Poland). The measurements show that although irradiation at the floor level increases temperature and reduces relative humidity in the interior of the church, the effect out of the heated zone and for the surfaces sheltered from irradiation is very limited, i.e. their extent is comparable with natural fluctuations inherent to the local climate of the church. The radiant heaters proved to generate little convectional flow of the air. Therefore, the heating system was not found to increase the concentration of SPM indoors; in particular, no re-suspension of particles already present in the church was observed. This work has demonstrated that the overhead radiant heaters are capable of providing localised heat to the areas where people congregate without adversely affecting painted walls and the works of arts displayed in churches. Care, however, should be taken that sensitive works of art are not exposed to the direct infrared radiation. 相似文献
84.
85.
International Journal for Educational and Vocational Guidance - 相似文献
86.
87.
Christina Haas Herman Van De Werfhorst 《British Journal of Sociology of Education》2017,38(5):705-720
This article investigates to what extent scholarships are unequally distributed among students in Germany and how these inequalities can be explained. Following sociological theory, the article argues that elites seek qualitative ways of distinguishing themselves in a mass higher education system. Using student surveys, we demonstrate that class effects cannot merely be explained with reference to class differences in academic achievement but that higher classes have better access to scholarships independent of earlier school performance. Class differences were particularly persistent when the intermediate classes were compared with higher classes with more education. These findings illustrate that social classes have different strategies when it comes to participating in higher education and suggest that information about and access to scholarships is important in gaining a class advantage. 相似文献
88.
Jeffrey S. Van Lone Michael Siembor Brian J. Mistler David J. Mapstone 《Journal of College Student Psychotherapy》2017,31(2):132-154
This article examines college student disengagement from sports, presents a multidimensional concept of athletic identity, and introduces a new measure intended to assist college counselors in their work with disengaged athletes. The Multidimensional Athletic Identity and Engagement Scale (MAIES) is introduced (Cronbach alpha .98, with subscale alphas between .78 and .96), and the results of exploratory and confirmatory factor analyses and convergent and divergent validity with 250 college student participants are presented. Using case examples, the authors discuss how counselors may use the MAIES in their work with students. Limitations of the study and suggestions for future research are discussed. 相似文献
89.
Combining entrepreneurial and scientific performance in academia: towards a compounded and reciprocal Matthew-effect? 总被引:2,自引:0,他引:2
The increase of entrepreneurial activity within academia has raised concerns that the research orientation of universities might become ‘contaminated’ by the application-oriented needs of industry. Empirical evidence on this concern is scarce and ambiguous. We examine whether entrepreneurial and scientific performance in academia can be reconciled. Our empirical findings (KU Leuven, Belgium) suggest that both activities do not hamper each other; engagement in entrepreneurial activities coincides with increased publication outputs, without affecting the nature of the publications involved. As resources increase, this interaction becomes more significant, pointing towards a Matthew-effect. We finally suggest that balancing both activities further depends on the institutional policies deployed. 相似文献
90.
Publication and patent behavior of academic researchers: Conflicting, reinforcing or merely co-existing? 总被引:1,自引:0,他引:1
Increasing entrepreneurial activity within academia has raised concerns that the number of publications added to the scientific commons might be reduced or that academic research would be directed exclusively towards the application-oriented needs of industry. In the case of academic inventions, the potential conflict between public- and private-oriented considerations seems most salient. In this contribution, we examine whether the publication behavior of academic inventors (at K.U. Leuven) differs from their colleagues (non-inventors) working within similar fields of research. Our analysis reveals that inventors publish significantly more. Moreover, no empirical evidence was found for the ‘skewing problem’. These findings not only suggest the co-existence of both activities; they may actually reinforce each other. 相似文献