全文获取类型
收费全文 | 438篇 |
免费 | 6篇 |
专业分类
教育 | 290篇 |
科学研究 | 35篇 |
体育 | 70篇 |
文化理论 | 4篇 |
信息传播 | 45篇 |
出版年
2023年 | 3篇 |
2022年 | 4篇 |
2021年 | 10篇 |
2020年 | 20篇 |
2019年 | 23篇 |
2018年 | 49篇 |
2017年 | 27篇 |
2016年 | 22篇 |
2015年 | 14篇 |
2014年 | 16篇 |
2013年 | 60篇 |
2012年 | 23篇 |
2011年 | 23篇 |
2010年 | 17篇 |
2009年 | 15篇 |
2008年 | 17篇 |
2007年 | 21篇 |
2006年 | 11篇 |
2005年 | 17篇 |
2004年 | 6篇 |
2003年 | 2篇 |
2002年 | 16篇 |
2001年 | 4篇 |
2000年 | 1篇 |
1999年 | 3篇 |
1998年 | 3篇 |
1993年 | 1篇 |
1992年 | 1篇 |
1991年 | 1篇 |
1990年 | 1篇 |
1989年 | 1篇 |
1988年 | 1篇 |
1987年 | 1篇 |
1986年 | 1篇 |
1985年 | 1篇 |
1980年 | 1篇 |
1979年 | 1篇 |
1975年 | 1篇 |
1974年 | 1篇 |
1970年 | 1篇 |
1969年 | 1篇 |
1964年 | 1篇 |
1963年 | 1篇 |
排序方式: 共有444条查询结果,搜索用时 410 毫秒
61.
Tobias Kärner Nina Minkley Andreas Rausch Thomas Schley Detlef Sembill 《Vocations and Learning》2018,11(3):365-398
By adapting the job demands-resources model of Demerouti et al. Journal of Applied Psychology, 86(3), 499–512, (2001) to vocational problem-solving situations, we aimed to investigate how, and to what extent, problem-solving demands and personal resources affect stress responses and task interest. Therefore, we used a problem-solving task from the business administration domain in a computer-based office simulation. We assigned 58 participants into two groups. The treatment group worked on the problem scenario, whereas the control group was instructed to inspect the computer-based scenario and to check the software’s usability without solving the problem. Problem-solving demands, perceived stress, task interest, cardiovascular parameters, and cortisol concentration were assessed before, during and after the task at several time points. The vocational problem-solving task was associated with perceived time pressure, uncertainty, mental effort, task difficulty, and perceived stress. In addition, we found higher heart rate and cortisol concentration and lower heart rate variability values in the treatment group (compared to the control group) at the end of the task. Furthermore, we found that content knowledge buffers the impact of problem-solving demands on stress responses and it maintains task interest under high mental effort. Overall, we found evidence that vocational problem-solving activities bear stress-evoking potential and personal resources may provide buffering and maintaining functions. 相似文献
62.
Andreas Schleicher 《European Journal of Education》2017,52(2):124-130
International comparisons are never easy and they are not perfect. But PISA shows what is possible in education and it helps countries to see themselves in the mirror of student performance and educational possibilities in other countries. This article summarises key policy insights from PISA. It highlights how excellence and improving equity need not be conflicting policy objectives, but that they tend to be jointly achieved only when deliberate policies are in place that match resources with needs and when stratification and grade repetition are contained. The article also shows how a number of countries have been able to raise learning outcomes and moderate the impact of social background in the last decade and highlights some of the policies and practices that characterise these countries. 相似文献
63.
Wolfgang Huber Uli Mayr Andreas Umgelter Michael Franzen Wolfgang Reindl Roland M. Schmid Florian Eckel 《Journal of Zhejiang University. Science. B》2018,19(7):515-524
Background and objective
Stroke volume variation (SVV) has high sensitivity and specificity in predicting fluid responsiveness. However, sinus rhythm (SR) and controlled mechanical ventilation (CV) are mandatory for their application. Several studies suggest a limited applicability of SVV in intensive care unit (ICU) patients. We hypothesized that the applicability of SVV might be different over time and within certain subgroups of ICU patients. Therefore, we analysed the prevalence of SR and CV in ICU patients during the first 24 h of PiCCO-monitoring (primary endpoint) and during the total ICU stay. We also investigated the applicability of SVV in the subgroups of patients with sepsis, cirrhosis, and acute pancreatitis.Methods
The prevalence of SR and CV was documented immediately before 1241 thermodilution measurements in 88 patients.Results: In all measurements, SVV was applicable in about 24%. However, the applicability of SVV was time-dependent: the prevalence of both SR and CV was higher during the first 24 h compared to measurements thereafter (36.1% vs. 21.9%; P<0.001). Within different subgroups, the applicability during the first 24 h of monitoring ranged between 0% in acute pancreatitis, 25.5% in liver failure, and 48.9% in patients without pancreatitis, liver failure, pneumonia or sepsis.Conclusions
The applicability of SVV in a predominantly medical ICU is only about 25%–35%. The prevalence of both mandatory criteria decreases over time during the ICU stay. Furthermore, the applicability is particularly low in patients with acute pancreatitis and liver failure.64.
65.
Filippos Giannakas Georgios Kambourakis Andreas Papasalouros Stefanos Gritzalis 《Educational technology research and development : ETR & D》2018,66(2):341-384
With the increasing popularity of smartphones and tablets, game-based learning (GBL) is undergoing a rapid shift to mobile platforms. This transformation is driven by mobility, wireless interfaces, and built-in sensors that these smart devices offer in order to enable blended and context-sensitive mobile learning (m-Learning) activities. Thus, m-Learning is becoming more independent and ubiquitous (u-Learning). In order to identify and analyze the main trends and the future challenging issues involved in designing mGBL learning strategies, as well as to bring to the foreground important issues pertaining to mobile and context-aware ubiquitous GBL, the work at hand conducts a comprehensive survey of this particular area. Specifically, it introduces and applies a six-dimensional framework consisted of Spatio-temporal, Collaboration/Social, Session, Personalization, Data security & privacy, and Pedagogy, with the aim of scrutinizing the contributions in the field of mGBL published from 2004 to 2016. It was found that the transition to mGBL presents several difficulties, and therefore cannot be conceived as a simple and quick modification of existing GBL solutions. In this respect, this work is anticipated to foster the development of well-designed solutions that are intensive not only in their technological aspect, but in pedagogical qualities as well. 相似文献
66.
67.
How can clusters sustain performance? The role of network strength, network openness, and environmental uncertainty 总被引:2,自引:0,他引:2
This paper draws on social network theory to develop a model of regional cluster performance. We suggest that high performing regional clusters are underpinned by (1) network strength and (2) network openness, but that the effects of these on the performance of a cluster as a whole are moderated by environmental uncertainty. Specifically, the positive effects of network openness on cluster performance tend to increase as environmental uncertainty increases, while the positive effects of network strength on cluster performance tend to decrease as environmental uncertainty increases. Our findings have theoretical and practical implications for social network research in general, and cluster research in particular. 相似文献
68.
69.
Securing quality and equity in education: Lessons from PISA 总被引:2,自引:0,他引:2
Andreas Schleicher 《Prospects》2009,39(3):251-263
Results from PISA show that strong educational performance, and indeed significant improvement over short periods of time,
is possible. Whether in Asia (e.g., Japan and Korea), in Europe (e.g., Finland) or in North America (Canada), many countries
display strong overall learning outcomes; equally important, they show that poor performance in school does not automatically
follow from a disadvantaged socio-economic background. Furthermore, some countries show that educational success can become
consistent and predictable, with very little variation in performance across schools. These countries set the goals to which
others can aspire. This article sets out some of the key policy levers that are associated with high levels of quality in
students’ learning outcomes as well as an equitable distribution of learning opportunities as measured by PISA. 相似文献
70.
Aggregate unemployment may affect individual returns to education through qualification-specific responses in participation and wage bargaining. This paper shows that an increase in regional unemployment by 1% decreases returns to education by 0.005 percentage points. This implies that higher skilled employees are better sheltered from labour market changes with respect to their jobs but they encounter larger wage changes than less skilled employees. We use representative individual data and panel variation in unemployment between German regions and employee groups. We demonstrate that our results are robust with respect to aggregation bias, time lags and potential endogeneity of the unemployment variable. 相似文献