全文获取类型
收费全文 | 351篇 |
免费 | 4篇 |
专业分类
教育 | 270篇 |
科学研究 | 17篇 |
各国文化 | 1篇 |
体育 | 26篇 |
综合类 | 1篇 |
文化理论 | 3篇 |
信息传播 | 37篇 |
出版年
2022年 | 2篇 |
2021年 | 5篇 |
2020年 | 2篇 |
2019年 | 20篇 |
2018年 | 14篇 |
2017年 | 10篇 |
2016年 | 10篇 |
2015年 | 5篇 |
2014年 | 11篇 |
2013年 | 80篇 |
2012年 | 13篇 |
2011年 | 14篇 |
2010年 | 8篇 |
2009年 | 3篇 |
2008年 | 9篇 |
2007年 | 12篇 |
2006年 | 6篇 |
2005年 | 5篇 |
2004年 | 7篇 |
2003年 | 2篇 |
2002年 | 6篇 |
2000年 | 4篇 |
1999年 | 1篇 |
1998年 | 1篇 |
1997年 | 5篇 |
1996年 | 3篇 |
1994年 | 5篇 |
1993年 | 11篇 |
1991年 | 13篇 |
1990年 | 6篇 |
1989年 | 2篇 |
1988年 | 2篇 |
1987年 | 2篇 |
1986年 | 1篇 |
1985年 | 7篇 |
1984年 | 2篇 |
1983年 | 7篇 |
1982年 | 5篇 |
1981年 | 6篇 |
1980年 | 2篇 |
1979年 | 4篇 |
1978年 | 6篇 |
1977年 | 4篇 |
1976年 | 3篇 |
1975年 | 2篇 |
1974年 | 1篇 |
1973年 | 1篇 |
1972年 | 1篇 |
1954年 | 1篇 |
1830年 | 1篇 |
排序方式: 共有355条查询结果,搜索用时 15 毫秒
11.
12.
Joel Blanchard Samuel Blais Philippe Chetaille Michele Bisson François P. Counil Thelma H. Girard 《Journal of sports sciences》2019,37(11):1265-1269
The purpose of this study was to identify which averaging methods most accurately measures peak cardiorespiratory fitness (CRF) parameters [peak O2 uptake (VO2), peak O2pulse and peak respiratory exchange ratio (RER)] in a sample of healthy children and adolescents. In this cross-sectional multicenter study, we recruited 278 healthy children aged 12–17 years. We compared the mean peak value of three CRF parameters using the recommended averaging methods (30-second block average) with alternative averaging methods such as moving averages or shorter smoothing periods. We also assessed averaging methods for accuracy by individually reviewing breath-by-breath scatter plots. The 30-second block average method resulted in a lower mean peak VO2 and in an increased proportion of underestimated peak values. Using a 30-second moving average significantly increased mean peak values which increased accuracy. Similar results were found for peak RER and peak O2pulse. In conclusion, the currently recommended averaging method (30-second block average) increased the risk of misinterpretation of peak CRF values in children. Using a moving average approach decreased misinterpretation and increased accuracy. 相似文献
13.
Alessandro Moura Zagatto Paulo Eduardo Redkva Rodrigo Araújo Bonetti de Poli Joel Abraham Martinez González Jeniffer Zanetti Brandani Thiago Penedo 《European Journal of Sport Science》2019,19(5):645-652
The purpose of this study was to investigate the use of a single 3-min all-out maximal effort to estimate anaerobic capacity (AC) through the lactate and excess post-exercise oxygen consumption (EPOC) response methods (AC[La?]+EPOCfast) on a cycle ergometer. Eleven physically active men (age?=?28.1?±?4.0?yrs, height?=?175.1?±?4.2?cm, body mass?=?74.8?±?11.9?kg and ?O2max?=?40.7?±?7.3?mL?kg?1?min?1), participated in the study and performed: i) five submaximal efforts, ii) a supramaximal effort at 115% of intensity of ?O2max, and iii) a 3-min all-out maximal effort. Anaerobic capacity was estimated using the supramaximal effort through conventional maximal accumulated oxygen deficit (MAOD) and also through the sum of oxygen equivalents from the glycolytic (fast component of excess post-exercise oxygen consumption) and phosphagen pathways (blood lactate accumulation) (AC[La?]+EPOCfast), while during the 3-min all-out maximal effort the anaerobic capacity was estimated using the AC[La?]+EPOCfast procedure. There were no significant differences between the three methods (p?>?0.05). Additionally, the anaerobic capacity estimated during the 3-min all-out effort was significantly correlated with the MAOD (r?=?0.74; p?=?0.009) and AC[La?]+EPOCfast methods (r?=?0.65; p?=?0.029). Therefore, it is possible to conclude that the 3-min all-out effort is valid to estimate anaerobic capacity in physically active men during a single cycle ergometer effort. 相似文献
14.
Trade in cultural products has traditionally been constrained by a combination of law and technology. In Europe, digital sellers based in a given EU country are not always able to distribute across borders. In January 2016, US-based Netflix announced an expansion to 243 countries, accomplishing cross-border distribution through business strategy. Changes in law or technology that facilitate cross-national cultural trade have traditionally drawn the concern of observers worried about the cultural heritage—and products—of small markets. The expansion raises questions about what Netflix is doing. Is it a cultural hegemon, distributing US fare into 243 countries? Or it is a facilitator of free trade, making the products of even small countries more available outside their home markets (relative to traditional distribution)? And how does the curated model—which limits the number of movies the platform wants to distribute—affect Netflix’s function? To shed light on these questions, we develop a new measure of the global availability of a repertoire, the value-weighted geographic reach. Using this measure we find, first, that Netflix makes many of the works from a wide variety of countries available in many other countries. Second, we find that theatrical distribution strongly advantages US-origin fare. Third, the pattern of origin repertoire available through Netflix also favors the USA, although less overwhelmingly. Moreover, many countries are relatively advantaged by their Netflix availability patterns. Finally, we discuss some issues related to the Netflix platform, including horizontal competition with other platforms, vertical struggles with content providers (and its backward integration into production), and we speculate on possible challenges for regulators. 相似文献
15.
Joel Spring 《教育政策杂志》2013,28(5):45-55
This essay discusses the importance of the relationship between power and knowledge for research into the politics of education. Based on this discussion, the author proposes research questions regarding the poor, effective schools, restructuring, and the influence of business on schools. Of particular concern is the effect of the relationship between power and knowledge on the education of children from poor families, and dominated racial and ethnic groups. In addition, the essay suggests an interrelationship between the political and economic interests of educational researchers and the types of research questions that they ask. 相似文献
16.
17.
Joel R. Levin Beverly J. Dretzke Michael Pressley Julia E. McGivern 《Contemporary educational psychology》1985,10(3):220-227
Previous research has indicated that the keyword method of vocabulary learning facilitates students' performance not just on simple tests of definition recall, but on comprehension-demanding tasks as well. The present study was conducted to determine whether the “comprehension” finding could be accounted for by keyword subjects' superior definition recall per se. The results generally supported that conclusion: When conditions and subjects within conditions were equated with respect to their initial levels of definition recall, the comprehension advantage of keyword subjects disappeared. 相似文献
18.
19.
Filippo Abbondanza Philip S. Dale Carol A. Wang Marianna E. Hayiou-Thomas Umar Toseeb Tanner S. Koomar Karen G. Wigg Yu Feng Kaitlyn M. Price Elizabeth N. Kerr Sharon L. Guger Maureen W. Lovett Lisa J. Strug Elsje van Bergen Conor V. Dolan J. Bruce Tomblin Kristina Moll Gerd Schulte-Körne Nina Neuhoff Andreas Warnke Simon E. Fisher Cathy L. Barr Jacob J. Michaelson Dorret I. Boomsma Margaret J. Snowling Charles Hulme Andrew J. O. Whitehouse Craig E. Pennell Dianne F. Newbury John Stein Joel B. Talcott Dorothy V. M. Bishop Silvia Paracchini 《Child development》2023,94(4):970-984
Handedness has been studied for association with language-related disorders because of its link with language hemispheric dominance. No clear pattern has emerged, possibly because of small samples, publication bias, and heterogeneous criteria across studies. Non-right-handedness (NRH) frequency was assessed in N = 2503 cases with reading and/or language impairment and N = 4316 sex-matched controls identified from 10 distinct cohorts (age range 6–19 years old; European ethnicity) using a priori set criteria. A meta-analysis (Ncases = 1994) showed elevated NRH % in individuals with language/reading impairment compared with controls (OR = 1.21, CI = 1.06–1.39, p = .01). The association between reading/language impairments and NRH could result from shared pathways underlying brain lateralization, handedness, and cognitive functions. 相似文献
20.
Recent simulations by Chen and Dorfman [Electrophoresis 35, 405–411 (2014)]
suggested that “tilting” the electric field with respect to the lattice vectors of a hexagonal post
array would lead to a substantial improvement in electrophoretic DNA separations therein. We
constructed such an array where the electric field is applied at an angle equidistant between the
two lattice vectors. This tilted array leads to (i) baseline resolution of 20 kbp DNA and λ DNA
(48.5 kbp) in a 4 mm channel and (ii) measurable separation resolutions for electric fields up to
50 V/cm, both of which are improvements over untilted post arrays of the same post density. The
predicted time required to reach a resolution of unity is approximately 5 min, independent of
electric field. The separations are more reproducible at higher fields. 相似文献