全文获取类型
收费全文 | 2546篇 |
免费 | 41篇 |
国内免费 | 2篇 |
专业分类
教育 | 1927篇 |
科学研究 | 154篇 |
各国文化 | 36篇 |
体育 | 191篇 |
综合类 | 2篇 |
文化理论 | 19篇 |
信息传播 | 260篇 |
出版年
2022年 | 20篇 |
2021年 | 30篇 |
2020年 | 43篇 |
2019年 | 68篇 |
2018年 | 114篇 |
2017年 | 109篇 |
2016年 | 114篇 |
2015年 | 51篇 |
2014年 | 71篇 |
2013年 | 541篇 |
2012年 | 67篇 |
2011年 | 77篇 |
2010年 | 46篇 |
2009年 | 57篇 |
2008年 | 65篇 |
2007年 | 52篇 |
2006年 | 54篇 |
2005年 | 33篇 |
2004年 | 45篇 |
2003年 | 33篇 |
2002年 | 34篇 |
2001年 | 29篇 |
2000年 | 47篇 |
1999年 | 31篇 |
1998年 | 24篇 |
1997年 | 37篇 |
1996年 | 32篇 |
1995年 | 24篇 |
1994年 | 29篇 |
1993年 | 28篇 |
1992年 | 40篇 |
1991年 | 38篇 |
1990年 | 32篇 |
1989年 | 36篇 |
1988年 | 23篇 |
1987年 | 33篇 |
1986年 | 20篇 |
1985年 | 18篇 |
1984年 | 17篇 |
1983年 | 21篇 |
1982年 | 20篇 |
1981年 | 21篇 |
1980年 | 13篇 |
1979年 | 12篇 |
1978年 | 16篇 |
1977年 | 15篇 |
1976年 | 14篇 |
1975年 | 13篇 |
1973年 | 11篇 |
1971年 | 12篇 |
排序方式: 共有2589条查询结果,搜索用时 31 毫秒
101.
102.
103.
104.
105.
D D Brown W G Mucci R K Hetzler R G Knowlton 《Research quarterly for exercise and sport》1989,60(3):246-250
T'ai Chi Chuan (TCC) is a widely practiced Chinese martial art said to physically develop balance and coordination as well as enhance emotional and mental health. TCC consists of a series of postures combined into a sequential movement providing a smooth, continuous, low-intensity activity. The purpose of this study was to examine the ventilatory and cardiovascular responses to the Long Form of Yang's style TCC. In addition, the subjects' TCC responses were compared to their ventilatory and cardiovascular responses during cycle ergometry at an oxygen consumption (VO2) equivalent to the mean TCC VO2. Six experienced (M = 8.3 yrs) male TCC practitioners served as subjects with data collected during the Cloud H and movement of the TCC exercise. Significantly (p less than .05) lower responses for ventilatory frequency (Vf) (11.3 and 15.7 breaths.min-1), ventilatory equivalent (VE/VO2) (23.47 and 27.41), and the ratio of dead space ventilation to tidal volume (VD/VT) (20 and 27%) were found in TCC in comparison to cycle ergometry. The percentage of minute ventilation used for alveolar ventilation was significantly higher during TCC (p less than .03) than cycle ergometry, with mean values of 81.1% and 73.1%, respectively. Cardiac output, stroke volume, and heart rate were not significantly different between TCC exercise and cycle ergometry at the same oxygen consumption. We concluded that, during TCC, expert practitioners show significantly different ventilatory responses leading to more efficient use of the ventilatory volume than would be expected from comparable levels of exertion on a cycle ergometer. 相似文献
106.
Three librarians who have extensive experience working in libraries or for publishers, vendors, or consortia presented an informal discussion on librarian–vendor relationships. The audience was encouraged to participate. Problems were articulated; speakers and audience members contributed suggestions for better approaches or behaviors when handling difficult situations. 相似文献
107.
Biomimetic scaffolds approaching physiological scale, whose size and large cellular load far exceed the limits of diffusion, require incorporation of a fluidic means to achieve adequate nutrient/metabolite exchange. This need has driven the extension of microfluidic technologies into the area of biomaterials. While construction of perfusable scaffolds is essentially a problem of microfluidic device fabrication, functional implementation of free-standing, thick-tissue constructs depends upon successful integration of external pumping mechanisms through optimized connective assemblies. However, a critical analysis to identify optimal materials/assembly components for hydrogel substrates has received little focus to date. This investigation addresses this issue directly by evaluating the efficacy of a range of adhesive and mechanical fluidic connection methods to gelatin hydrogel constructs based upon both mechanical property analysis and cell compatibility. Results identify a novel bioadhesive, comprised of two enzymatically modified gelatin compounds, for connecting tubing to hydrogel constructs that is both structurally robust and non-cytotoxic. Furthermore, outcomes from this study provide clear evidence that fluidic interconnect success varies with substrate composition (specifically hydrogel versus polydimethylsiloxane), highlighting not only the importance of selecting the appropriately tailored components for fluidic hydrogel systems but also that of encouraging ongoing, targeted exploration of this issue. The optimization of such interconnect systems will ultimately promote exciting scientific and therapeutic developments provided by microfluidic, cell-laden scaffolds. 相似文献
108.
Robin Patric Clair Nadia E. Brown Debbie S. Dougherty Hannah K. Delemeester Patricia Geist-Martin William I. Gorden 《Journal of Applied Communication Research》2019,47(2):111-129
#MeToo has breathed new life into the women’s movement and especially into understanding and rectifying sexual harassment, abuse and assault. It has galvanized activists around the globe. And it has placed thousands of stories of the harassed in full view of the public. Sexual harassment, abuse and assault may occur within the organizational context or beyond; but sexual harassment, in particular has been legally labeled an organizational phenomenon. With this in mind, Robin Clair frames the early part of this article around the most recent organizational communication theories (see the appendix for an overview of these theories). Following the essay is a forum, in which invited scholars address questions related to the #MeToo movement. 相似文献
109.
Infants become sensitive to emotion expressions early in the 1st year and such sensitivity is likely crucial for social development and adaptation. Social interactions with primary caregivers may play a key role in the development of this complex ability. This study aimed to investigate how variations in parenting behavior affect infants' neural responses to emotional faces. Event‐related potentials (ERPs) to emotional faces were recorded from 40 healthy 7‐month‐old infants (24 males). Parental behavior was assessed and coded using the Emotional Availability Scales during free‐play interaction. Sensitive parenting was associated with increased amplitudes to positive facial expressions on the face‐sensitive ERP component, the negative central. Findings are discussed in relation to the interactive mechanisms influencing how infants neurally encode positive emotions. 相似文献
110.
As elite youth sport becomes more organized and professionalized, the role of the family is increasingly acknowledged as being significant in the development of young talent. High-profile examples across a range of professional sports, both positive and negative, have drawn attention toward this important stakeholder. Accordingly, this review first examines the key issues in relation to family involvement in talent development in relation to what is perceived as good and bad practice on behalf of the family. Next the key theoretical underpinning is considered, Family Systems Theory, and how it may be integrated within elite youth sport. Finally, the article concludes with a summary of where the current literature leaves us and where we can progress from here. Two possible inputs are suggested that could benefit the effectiveness of family involvement: a focus on the family holistically and a second on the role different family members can play. 相似文献