全文获取类型
收费全文 | 1980篇 |
免费 | 32篇 |
国内免费 | 16篇 |
专业分类
教育 | 1423篇 |
科学研究 | 186篇 |
各国文化 | 30篇 |
体育 | 210篇 |
综合类 | 28篇 |
文化理论 | 16篇 |
信息传播 | 135篇 |
出版年
2022年 | 27篇 |
2021年 | 27篇 |
2020年 | 45篇 |
2019年 | 59篇 |
2018年 | 87篇 |
2017年 | 78篇 |
2016年 | 76篇 |
2015年 | 38篇 |
2014年 | 59篇 |
2013年 | 267篇 |
2012年 | 76篇 |
2011年 | 59篇 |
2010年 | 47篇 |
2009年 | 59篇 |
2008年 | 49篇 |
2007年 | 64篇 |
2006年 | 69篇 |
2005年 | 59篇 |
2004年 | 56篇 |
2003年 | 95篇 |
2002年 | 124篇 |
2001年 | 120篇 |
2000年 | 72篇 |
1999年 | 28篇 |
1998年 | 22篇 |
1997年 | 22篇 |
1996年 | 16篇 |
1995年 | 17篇 |
1994年 | 13篇 |
1993年 | 15篇 |
1992年 | 10篇 |
1991年 | 15篇 |
1990年 | 15篇 |
1989年 | 8篇 |
1988年 | 7篇 |
1987年 | 10篇 |
1986年 | 5篇 |
1985年 | 10篇 |
1984年 | 8篇 |
1983年 | 6篇 |
1982年 | 6篇 |
1980年 | 5篇 |
1978年 | 8篇 |
1974年 | 4篇 |
1973年 | 4篇 |
1972年 | 4篇 |
1969年 | 4篇 |
1967年 | 5篇 |
1964年 | 7篇 |
1865年 | 4篇 |
排序方式: 共有2028条查询结果,搜索用时 15 毫秒
171.
This study examined the influence of the regression model and initial intensity of an incremental test on the relationship between the lactate threshold estimated by the maximal-deviation method and the endurance performance. Sixteen non-competitive, recreational female runners performed a discontinuous incremental treadmill test. The initial speed was set at 7 km · h?1, and increased every 3 min by 1 km · h?1 with a 30-s rest between the stages used for earlobe capillary blood sample collection. Lactate-speed data were fitted by an exponential-plus-constant and a third-order polynomial equation. The lactate threshold was determined for both regression equations, using all the coordinates, excluding the first and excluding the first and second initial points. Mean speed of a 10-km road race was the performance index (3.04 ± 0.22 m · s?1). The exponentially-derived lactate threshold had a higher correlation (0.98 ≤ r ≤ 0.99) and smaller standard error of estimate (SEE) (0.04 ≤ SEE ≤ 0.05 m · s?1) with performance than the polynomially-derived equivalent (0.83 ≤ r ≤ 0.89; 0.10 ≤ SEE ≤ 0.13 m · s?1). The exponential lactate threshold was greater than the polynomial equivalent (P < 0.05). The results suggest that the exponential lactate threshold is a valid performance index that is independent of the initial intensity of the incremental test and better than the polynomial equivalent. 相似文献
172.
Cottyn J De Clercq D Crombez G Lenoir M 《Research quarterly for exercise and sport》2012,83(2):300-307
The interaction between functional and dysfunctional emotions, as one of the major tenets of the individual zones of optimal functioning (IZOF) model (Hanin, 2000), was studied in a sport specific setting. Fourteen female gymnasts performed three attempts of a compulsory balance beam routine at three different heights. Heart rate and self-report of functional and dysfunctional emotions were measured during each routine. These data revealed the effectiveness of inducting emotions by manipulating height. Also, performance decreased on the most challenging condition, (i.e., the first attempt on the highest height). Moderated hierarchical regression analysis revealed a significant interaction between functional and dysfunctional emotions only when the dysfunctional emotion level was low. 相似文献
173.
Environmental innovation and R&D cooperation: Empirical evidence from Spanish manufacturing firms 总被引:2,自引:0,他引:2
Valentina De Marchi 《Research Policy》2012,41(3):614-623
This paper explores the relationship between firms’ R&D cooperation strategies and their propensity to introduce environmental innovations.Previous literature has supported that environmental innovations differ from other innovations as far as externalities and drivers of their introduction are concerned, highlighting mainly the importance of regulation to trigger them. Using data from the Community Innovation Survey on Spanish manufacturing firms (PITEC), this paper investigates specificities that affect rather how they are developed, and in particular the higher importance of R&D cooperation with external partners.The econometric estimations, controlling for selection bias, suggest that environmental innovative firms cooperate on innovation with external partners to a higher extent than other innovative firms. Furthermore, cooperation with suppliers, KIBS and universities is more relevant than for other innovators, whereas cooperation with clients does not seem to be differentially important. Finally, the results bespoke of a substitution effect between cooperation activities and the internal R&D effort. 相似文献
174.
Enrique Herrera-Viedma Guy De Tré Slawomir Zadrozny Jose Angel Olivas 《Information processing & management》2012
Soft Computing (SC) tools present a great potential in real-life problems related with engineering, industrial applications, medicine, finances, etc. In this special issue we present a set of seven papers that report original research about the use of SC techniques to solve the problems in the field of information access on the Web. 相似文献
175.
襄樊市拥有丰厚的书法艺术文化,书法影响着襄樊城市形象塑造。书法作为景观组成元素对塑造襄樊城市整体形象、打造襄樊城市标识、开发设计襄樊城市旅游、营造襄樊古城商业营销环境等具有重要作用,书法景观建设是弘扬和设计襄樊城市形象不可缺少的基本手段与内容。 相似文献
176.
In two experiments, we examined how preexposure to discriminative stimuli and introduction of a 21-day retention interval
affected the latent inhibition (LI) and perceptual learning (PL) of rats in a choice-maze discrimination task. Experimental
groups were preexposed to three wall patterns, one in each of three arms of a maze. Control groups were preexposed only to
white arms. PL groups were trained to discriminate A versus B, and LI groups, to discriminate A or B versus C. The A and B
patterns shared many elements not shared with the C pattern. In Experiment 1, both at the end of training and after the subsequent
retention interval, the PL groups performed better than controls, whereas the LI groups performed worse. In Experiment 2,
inserting the 21-day retention interval between preexposure and discrimination training disrupted final measures of LI but
not PL performance. Implications for current concepts of PL and LI are discussed. 相似文献
177.
This longitudinal follow-up study surveyed the attitudes toward, and skills in, evidence-based medicine (EBM) of medical school graduates who had participated in a formal EBM curriculum during their third-year Internal Medicine (IM) clerkship. The objective was to measure whether competencies were retained over time and to identify the long- term impact on the graduates' attitudes toward, and proficiency in, EBM after graduation. Questionnaire results showed that a group of medical school graduates retained EBM skills and a positive attitude about the importance of applying EBM principles in patient care one to three years after completing an EBM course. 相似文献
178.
Attempting to push early modern presentism to the radical, logical conclusion of a more personal historicism, this essay draws on a number of interpretive practices and theoretical insights – Stephen Greenblatt’s self-reflectivity, Toni Morrison’s ‘rememory’, Marianne Hirsch’s ‘postmemory’, bell hooks’s ‘passion of experience’, and Linda Charnes’s alternative historicism – to establish the ethical and interpretive significance of my own painful situatedness as an African American man in Renaissance/Early Modern studies. Specifically, I illustrate that significance in a reading of Richard Mulcaster’s Positions Concerning the Bringing Up of Children, a sixteenth-century educational treatise that responds, as I argue, to early modern educational access and social mobility with an insidiously complex, exclusionary admissions policy. 相似文献
179.
This article examines the impact of professional education on students' dedication to and identification with a profession. The premise is that professional education is not only about knowledge acquisition and reasoning but also about attitudes and aspirations. In fostering dedication and identification, students' experiences of relevance seem to be important. The concept of coherence seen as an expression of relevance is introduced and measured by four kinds of interactions: Theory–practice interaction, teacher–student interaction, peer interaction and supervisor–student interaction. Analysis indicates that coherence, particularly as theory–practice interaction, peer interaction and supervisor–student interaction, has a significant impact on dedication to and identification with a profession. Longitudinal survey data – collected from students in colleges for teaching, nursing and social work – are analysed. 相似文献
180.
Rianne Janssen Erik De Corte Lieven Verschaffel Evelyn Knoors Ariane Colémont 《Educational Research and Evaluation》2013,19(2):197-225
A baseline assessment of the new curriculum standards of mathematics for elementary education in Flanders is presented and discussed. A total of 24 measurement scales, each representing a cluster of standards, covered the whole mathematics curriculum. A total of 5,763 6th-grade students participated in the study. Performance on each scale was summarized by estimating the proportion of students who were nonmasters, intermediate, and good masters. Overall, the more innovative curriculum standards were mastered worse. Few gender differences in performance were observed. 相似文献