首页 | 本学科首页   官方微博 | 高级检索  
文章检索
  按 检索   检索词:      
出版年份:   被引次数:   他引次数: 提示:输入*表示无穷大
  收费全文   1454篇
  免费   29篇
  国内免费   1篇
教育   1174篇
科学研究   60篇
各国文化   23篇
体育   91篇
综合类   1篇
文化理论   11篇
信息传播   124篇
  2023年   8篇
  2022年   14篇
  2021年   17篇
  2020年   26篇
  2019年   43篇
  2018年   70篇
  2017年   76篇
  2016年   52篇
  2015年   53篇
  2014年   42篇
  2013年   332篇
  2012年   34篇
  2011年   55篇
  2010年   42篇
  2009年   37篇
  2008年   40篇
  2007年   34篇
  2006年   28篇
  2005年   25篇
  2004年   30篇
  2003年   15篇
  2002年   33篇
  2001年   26篇
  2000年   27篇
  1999年   14篇
  1998年   15篇
  1997年   15篇
  1996年   14篇
  1995年   15篇
  1994年   21篇
  1993年   8篇
  1992年   11篇
  1991年   9篇
  1990年   18篇
  1989年   9篇
  1986年   10篇
  1985年   11篇
  1984年   12篇
  1983年   8篇
  1982年   10篇
  1981年   15篇
  1980年   11篇
  1979年   14篇
  1978年   8篇
  1977年   10篇
  1976年   6篇
  1975年   5篇
  1973年   6篇
  1971年   6篇
  1968年   5篇
排序方式: 共有1484条查询结果,搜索用时 359 毫秒
1.
This article questions some popular cultural assumptions about the nature of everyday discourse. It claims that such discourse is in fact richly metaphorical and that, through the operation of metaphor, we fictionalise ourselves as we talk. Because literary writing has dominated our culture and curriculum, English teachers have not been encouraged to explore an aspect of language that is at the core of how we think and behave.  相似文献   
2.
Gordon  R. S.  Franklin  K. L.  Baker  J.  Davies  B. 《Sports Engineering》2004,7(3):131-138
Sports Engineering - A Monark cycle ergometer is a device globally used in physiological studies to measure the work and energy levels of exercising humans. In this paper a rope-braked cycle...  相似文献   
3.
In 2008 Meier and Conkling first tested Google Scholar's coverage of the engineering literature against citations gathered from the Compendex database. Since that time, other studies have used the same methodology and found improvement in Google Scholar's coverage. This study uses engineering dissertations from Proquest Dissertations & Theses to create a data set of citations for the comparison of fee-based databases, Compendex and Scopus, against Google Scholar. From 1950 to 2017 Google Scholar outperformed both Compendex and Scopus in discoverability of citations in nine engineering subjects. These results have implications for collection management and information literacy program planning for librarians.  相似文献   
4.
5.
6.
7.
Although most ACL injury prevention programmes encourage greater hip and knee flexion during landing, it remains unknown how this technique influences tibiofemoral joint forces. We examined whether a landing strategy utilising greater hip and knee flexion decreases tibiofemoral anterior shear and compression. Twelve healthy women (25.9 ± 3.5 years) performed a drop-jump task before and after a training session (10–15 min) that emphasised greater hip and knee flexion. Peak tibiofemoral anterior shear and compressive forces were calculated using an electromyography (EMG)-driven knee model that incorporated joint kinematics, EMG and participant-specific muscle volumes and patella tendon orientation measured using magnetic resonance imaging (MRI). Participants demonstrated a decrease in peak anterior tibial shear forces (11.1 ± 3.3 vs. 9.6 ± 2.7 N · kg?1; P = 0.008) and peak tibiofemoral compressive forces (68.4 ± 7.6 vs. 62.0 ± 5.5 N · kg?1; P = 0.015) post-training. The decreased peak anterior tibial shear was accompanied by a decrease in the quadriceps anterior shear force, while the decreased peak compressive force was accompanied by decreased ground reaction force and hamstring forces. Our data provide justification for injury prevention programmes that encourage greater hip and knee flexion during landing to reduce tibiofemoral joint loading.  相似文献   
8.
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   
9.
Over the past thirty years NASIG has evolved as a community, supporting the exchange of ideas regarding serials in the early days and more recently expanding into broader topics such as electronic resources and scholarly communications. Thirty years of NASIG conference programs, publications, workshops, and webinars will be evaluated to identify trends and understand the evolution of NASIG as an organization.  相似文献   
10.
Lower limb dominance (or lateral preference) could potentially effect functional performance. Clinicians are often asked to make judgements as to when a patient has sufficiently “recovered” from an injury, typically using strength and dynamic performance outcome measures. The primary purpose of this study was to systematically review the literature in relation to limb dominance within active adult populations and discuss some limitations to current methods and relate this to current clinical practice. A search of MEDLINE and CINAHL and EMBASE databases and reference lists of those articles identified was performed. Eleven articles were selected for meta-analysis. There was no statistical effect of limb dominance for any of the functional tests: isokinetic quadriceps and hamstring tests, hamstring:quadriceps ratios, single-leg hop for distance, single-leg vertical jump and vertical ground reaction force following a single-leg vertical jump. Pooled symmetry values varied from 94.6% to 99.6% across the tests, above the clinically accepted benchmark of 90% used in clinical practice. Although the results of this study must be used with discretion, asymmetries in the tasks described in this analysis should be viewed as undesirable and remedied accordingly. Further research is needed to quantify asymmetries, particularly in relation to sport-specific contexts.  相似文献   
设为首页 | 免责声明 | 关于勤云 | 加入收藏

Copyright©北京勤云科技发展有限公司  京ICP备09084417号