全文获取类型
收费全文 | 1049篇 |
免费 | 48篇 |
专业分类
教育 | 836篇 |
科学研究 | 32篇 |
各国文化 | 40篇 |
体育 | 42篇 |
文化理论 | 7篇 |
信息传播 | 140篇 |
出版年
2023年 | 3篇 |
2022年 | 8篇 |
2021年 | 16篇 |
2020年 | 18篇 |
2019年 | 32篇 |
2018年 | 51篇 |
2017年 | 59篇 |
2016年 | 48篇 |
2015年 | 34篇 |
2014年 | 45篇 |
2013年 | 226篇 |
2012年 | 27篇 |
2011年 | 29篇 |
2010年 | 31篇 |
2009年 | 26篇 |
2008年 | 30篇 |
2007年 | 26篇 |
2006年 | 20篇 |
2005年 | 25篇 |
2004年 | 23篇 |
2003年 | 37篇 |
2002年 | 24篇 |
2001年 | 16篇 |
2000年 | 21篇 |
1999年 | 14篇 |
1998年 | 5篇 |
1997年 | 13篇 |
1996年 | 19篇 |
1995年 | 11篇 |
1994年 | 7篇 |
1993年 | 14篇 |
1992年 | 7篇 |
1991年 | 13篇 |
1990年 | 14篇 |
1989年 | 12篇 |
1988年 | 8篇 |
1987年 | 9篇 |
1986年 | 6篇 |
1985年 | 9篇 |
1984年 | 6篇 |
1983年 | 8篇 |
1982年 | 5篇 |
1981年 | 6篇 |
1980年 | 3篇 |
1979年 | 5篇 |
1978年 | 5篇 |
1969年 | 2篇 |
1928年 | 2篇 |
1926年 | 3篇 |
1859年 | 2篇 |
排序方式: 共有1097条查询结果,搜索用时 0 毫秒
51.
AbstractA large body of evidence now shows that higher protein intakes (2–3 times the protein Recommended Dietary Allowance (RDA) of 0.8 g/kg/d) during periods of energy restriction can enhance fat-free mass (FFM) preservation, particularly when combined with exercise. The mechanisms underpinning the FFM-sparing effect of higher protein diets remain to be fully elucidated but may relate to the maintenance of the anabolic sensitivity of skeletal muscle to protein ingestion. From a practical point of view, athletes aiming to reduce fat mass and preserve FFM should be advised to consume protein intakes in the range of ~1.8–2.7 g kg?1 d?1 (or ~2.3–3.1 g kg?1 FFM) in combination with a moderate energy deficit (?500 kcal) and the performance of some form of resistance exercise. The target level of protein intake within this recommended range requires consideration of a number of case-specific factors including the athlete's body composition, habitual protein intake and broader nutrition goals. Athletes should focus on consuming high-quality protein sources, aiming to consume protein feedings evenly spaced throughout the day. Post-exercise consumption of 0.25–0.3 g protein meal?1 from protein sources with high leucine content and rapid digestion kinetics (i.e. whey protein) is recommended to optimise exercise-induced muscle protein synthesis. When protein is consumed as part of a mixed macronutrient meal and/or before bed slightly higher protein doses may be optimal. 相似文献
52.
We compared the effects of (1) accurate and (2) surreptitiously augmented performance feedback on power output and physiological responses to a 4000 m time-trial in the heat. Nine cyclists completed a baseline (BaseL) 4000 m time-trial in ambient temperatures of 30°C, followed by two further 4000 m time-trials at the same temperature, randomly assigning the participants to an accurate (ACC; accurate feedback of baseline) or deceived (DEC; 2% increase above baseline) feedback group. The total power output (PO) and aerobic (Paer) and anaerobic (Pan) contributions were determined at 0.4 km stages during the time-trials, alongside measurements of rectal (Trec) and skin (Tskin) temperatures. There were no differences (P > 0.05) in any of the variables between BaseL, ACC and DEC, despite increases (P < 0.05) in Trec and Tskin. Typical pacing profiles were demonstrated; however, there was no interaction (P > 0.05) between feedback condition and time-trial stage. Providing surreptitiously augmented performance feedback to well-trained cyclists did not alter their performance or physiological responses to a 4000 m time-trial in a hot environment. The assumed influence of augmented performance feedback was nullified in the heat, perhaps reflecting a central down-regulation of exercise intensity in response to an increased body temperature. 相似文献
53.
54.
This study examines the effects of the differences in organizational identities that emerged during a post-merger project that aimed at unifying the laboratory services of a large healthcare center that resulted from the merging of three hospitals by supporting them with a unique information system. We draw on the concepts of organizational identity and sensemaking to analyze the laboratory information system implementation project. Organizational identity is conceptualized as the mental representation that organizational members have of themselves as a social group in terms of practices, norms, and values and how they understand themselves to be different from members of other organizations. Data analysis suggests that divergent organizational identities and team members’ alternative interpretations of others’ practices, norms and organizational symbols, coexist during the post-merger integration phase. These interpretations are reflected in the final functionality of the information system that was different from the planned one. 相似文献
55.
Elizabeth Murphy 《New Review of Academic Librarianship》2013,19(3):256-273
This article discusses an assessment and deselection project of the modern print book collections in the John Paul II Library, National University of Ireland Maynooth. Following a contextual introduction and literature review, the article outlines the methodology, presents and discusses the results, and concludes with lessons learned. Although this project had its origins in planning for a major extension to the Library, its main aim was to ensure current and relevant print book collections. The purpose of the article is to share experience in the hope of it being useful to other libraries considering a review of print book collections. 相似文献
56.
Daniel A. Wagner Nathan M. Castillo Katie M. Murphy Molly Crofton Fatima Tuz Zahra 《Prospects》2014,44(1):119-132
In recent years, the advent of low-cost digital and mobile devices has led to a strong expansion of social interventions, including those that try to improve student learning and literacy outcomes. Many of these are focused on improving reading in low-income countries, and particularly among the most disadvantaged. Some of these early efforts have been called successful, but little credible evidence exists for those claims. Drawing on a robust sample of projects in the domain of mobiles for literacy, this article introduces a design solution framework that combines intervention purposes with devices, end users, and local contexts. In combination with a suggested set of purpose-driven methods for monitoring and evaluation, this new framework provides useful parameters for measuring effectiveness in the domain of mobiles for literacy. 相似文献
57.
59.
60.
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