全文获取类型
收费全文 | 10461篇 |
免费 | 133篇 |
国内免费 | 122篇 |
专业分类
教育 | 6735篇 |
科学研究 | 1248篇 |
各国文化 | 93篇 |
体育 | 1640篇 |
综合类 | 19篇 |
文化理论 | 73篇 |
信息传播 | 908篇 |
出版年
2021年 | 81篇 |
2020年 | 162篇 |
2019年 | 212篇 |
2018年 | 291篇 |
2017年 | 297篇 |
2016年 | 269篇 |
2015年 | 185篇 |
2014年 | 246篇 |
2013年 | 1646篇 |
2012年 | 222篇 |
2011年 | 235篇 |
2010年 | 199篇 |
2009年 | 213篇 |
2008年 | 198篇 |
2007年 | 189篇 |
2006年 | 207篇 |
2005年 | 178篇 |
2004年 | 395篇 |
2003年 | 354篇 |
2002年 | 340篇 |
2001年 | 405篇 |
2000年 | 245篇 |
1999年 | 170篇 |
1998年 | 112篇 |
1997年 | 106篇 |
1996年 | 106篇 |
1995年 | 112篇 |
1994年 | 106篇 |
1993年 | 84篇 |
1992年 | 157篇 |
1991年 | 125篇 |
1990年 | 141篇 |
1989年 | 153篇 |
1988年 | 111篇 |
1987年 | 132篇 |
1986年 | 120篇 |
1985年 | 142篇 |
1984年 | 123篇 |
1983年 | 127篇 |
1982年 | 99篇 |
1981年 | 82篇 |
1980年 | 91篇 |
1979年 | 136篇 |
1978年 | 91篇 |
1977年 | 74篇 |
1976年 | 90篇 |
1975年 | 68篇 |
1974年 | 72篇 |
1973年 | 71篇 |
1971年 | 67篇 |
排序方式: 共有10000条查询结果,搜索用时 296 毫秒
151.
152.
T. P. Gorman 《Educational research; a review for teachers and all concerned with progress in education》2013,55(3):190-198
This article summarizes the findings of an NFER project which studied the roles, management and practices of LEA advisory services throughout England and Wales. The full report of the research (Stillman and Grant, 1988) will be published in January by NFER‐NELSON. 相似文献
153.
154.
Frank P. Belcastro 《Roeper Review》2013,35(3):184-189
This article responds to attitudes about giftedness in M. Sapon‐Shevin's article, “Explaining Giftedness to Parents: Why it Matters What Professionals Say.” Giftedness is not a reward or a privilege, but an aspect of a child's individuality that should be understood and taken into account by the educational system. Gifted children's needs are not solely academic, and it is parents who are responsible for meeting those needs. They need information from as many sources as possible. They are also excellent sources of information themselves, so the relationship between professionals and parents should be reciprocal. This article also responds to some of Sapon‐Shevin's objections to the book Guiding the Gifted Child, (Webb, Meckstroth, Tolan, 1982). In the preparation of this article, the writer worked closely with coauthors James T. Webb and Elizabeth Meckstroth, whose pioneering work with the SENG Project at Wright State University provided the basis of Guiding the Gifted Child. 相似文献
155.
Abstract In this study we describe and examine the effectiveness of an instructional program designed to teach learning disabled adolescents to make better personal decisions. We presented problems in short narratives based on the types of problems these students must solve in their own lives. The program, conducted as part of the students' regular resource room curriculum, incorporated schema‐general questions for problem solving coupled with practice in generating problem‐specific questions to reach an appropriate decision. Participants were 70 resource room students in two large, urban high schools. We employed a pretest‐posttest comparison group design. On the posttest, instructed students performed significantly better on (1) identifying a general schema for making a personal decision and (2) applying the schema to reach appropriate decisions concerning novel problem narratives. The results support the view that application of a general schema to specific problems can be an effective instructional method to improve critical thinking and decision making. 相似文献
156.
A. V. Aleinikov D. A. Mal’tseva V. P. Miletskii 《Scientific and Technical Information Processing》2016,43(2):106-114
This paper analyzes modern information technologies as applied in the political environment and considers the content and peculiarities of using IT programs in strategic political modeling. 相似文献
157.
158.
Comparison of oil and egg tempera paint systems using time-of-flight secondary ion mass spectrometry
Zachary E. Voras Kristin deGhetaldi Brian Baade Eric Gordon Glenn Gates Thomas P. Beebe 《文物保护研究》2016,61(4):222-235
Time-of-flight secondary ion mass spectrometry (ToF-SIMS) is quickly becoming a critical tool in the field of art conservation. This technique provides high-resolution spatial maps of both inorganic and organic components located within cross-sectional samples collected from works of art. With recent advances in surface analysis, ToF-SIMS can now be used to identify specific amino acids present in protein-containing materials as well as fatty acids in drying oils. For example, the detection of the ion fragment associated with the amino acid hydroxyproline can be used to confirm the use of animal glue in a paint sample. As an analytical technique, ToF-SIMS avoids the need for derivatization/silylation reagents, with no interference by the presence of pigments. Furthermore, the layered systems that are often encountered in historical paint samples remain intact throughout the analytical procedure. This allows for the co-localization of organic and inorganic species in specific layers (e.g. egg yolk paint atop a glue ground). Because of this ability to localize the analytical signal to approximately 6?µm or less, the mass spectral information can be used to produce mass-resolved and spatially-resolve images which can be correlated to previous studies of the same samples. In this study, ToF-SIMS was used to analyze a paint cross section obtained from a painting attributed to Raphael, and another from a painting by the Sienese artist Matteo di Giovanni. 相似文献
159.
Daan Van De Pol Sena Alaeikhanehshir Mario Maas P. Paul F.M. Kuijer 《Journal of sports sciences》2016,34(12):1141-1147
The prevalence of ischaemia-related symptoms is remarkably high among elite indoor volleyball players. Since the exposure to sport-specific demands may be higher in beach volleyball compared to indoor volleyball, the aim of this study was to assess the prevalence of ischaemia-related symptoms and associated risk factors among world-class beach volleyball players. Therefore, a questionnaire survey was performed among beach volleyball players active during the 2013 Grand Slam Beach Volleyball in the Netherlands. In total, 60 of the 128 beach volleyball players (47%) participated: 26 males and 34 females from 17 countries. The self-reported prevalence of cold or blue or pale digits in the dominant hand during or immediately after practice or competition was 38% (n = 23). Two risk factors were independently associated with symptoms of blue or pale digits: more than 14 years playing volleyball (odds ratio (OR) 4.42, 90% confidence interval (90% CI) 1.30–15.07) and sex (female) (OR 4.62, 90% CI 1.15–18.57). In conclusion, the prevalence of symptoms associated with digital ischaemia is high among international world-class beach volleyball players. Female sex and the length of the volleyball career were independently associated with an increased risk of ischaemia-related symptoms. The high prevalence of these seemingly innocuous symptoms and possible associated risk factors warrant regular monitoring since early detection can potentially prevent thromboembolic complications and irreversible tissue damage. 相似文献
160.
Research examining our ability to avoid obstacles in our path has stressed the importance of visual input. The aim of this study was to determine if athletes playing varsity-level field sports, who rely on visual input to guide motor behaviour, are more able to guide their foot over obstacles compared to recreational individuals. While wearing kinematic markers, eight varsity athletes and eight age-matched controls (aged 18–25) walked along a walkway and stepped over stationary obstacles (180° motion arc). Visual input was manipulated using PLATO visual goggles three or two steps pre-obstacle crossing and compared to trials where vision was given throughout. A main effect between groups for peak trail toe elevation was shown with greater values generated by the controls for all crossing conditions during full vision trials only. This may be interpreted as athletes not perceiving this obstacle as an increased threat to their postural stability. Collectively, findings suggest the athletic group is able to transfer their abilities to non-specific conditions during full vision trials; however, varsity-level athletes were equally reliant on visual cues for these visually guided stepping tasks as their performance was similar to the controls when vision is removed. 相似文献