全文获取类型
| 收费全文 | 557篇 |
| 免费 | 10篇 |
专业分类
| 教育 | 374篇 |
| 科学研究 | 65篇 |
| 各国文化 | 10篇 |
| 体育 | 41篇 |
| 文化理论 | 8篇 |
| 信息传播 | 69篇 |
出版年
| 2022年 | 4篇 |
| 2021年 | 6篇 |
| 2020年 | 8篇 |
| 2019年 | 15篇 |
| 2018年 | 25篇 |
| 2017年 | 19篇 |
| 2016年 | 23篇 |
| 2015年 | 22篇 |
| 2014年 | 18篇 |
| 2013年 | 135篇 |
| 2012年 | 14篇 |
| 2011年 | 18篇 |
| 2010年 | 10篇 |
| 2009年 | 13篇 |
| 2008年 | 11篇 |
| 2007年 | 17篇 |
| 2006年 | 10篇 |
| 2005年 | 8篇 |
| 2004年 | 6篇 |
| 2003年 | 8篇 |
| 2002年 | 11篇 |
| 2001年 | 8篇 |
| 2000年 | 16篇 |
| 1999年 | 6篇 |
| 1997年 | 4篇 |
| 1996年 | 5篇 |
| 1995年 | 3篇 |
| 1994年 | 5篇 |
| 1991年 | 5篇 |
| 1990年 | 5篇 |
| 1987年 | 6篇 |
| 1985年 | 6篇 |
| 1983年 | 8篇 |
| 1982年 | 5篇 |
| 1981年 | 3篇 |
| 1980年 | 4篇 |
| 1978年 | 4篇 |
| 1975年 | 3篇 |
| 1973年 | 4篇 |
| 1972年 | 3篇 |
| 1971年 | 2篇 |
| 1968年 | 3篇 |
| 1967年 | 3篇 |
| 1897年 | 2篇 |
| 1882年 | 2篇 |
| 1880年 | 2篇 |
| 1872年 | 6篇 |
| 1871年 | 8篇 |
| 1870年 | 7篇 |
| 1868年 | 3篇 |
排序方式： 共有567条查询结果，搜索用时 15 毫秒
151.
152.
153.
The main aim of this study was to identify significant relationships between selected anthropometric and kinematic variables and ball release speed. Nine collegiate fast-medium bowlers (mean +/- s: age 21.0 +/- 0.9 years, body mass 77.2 +/- 8.1 kg, height 1.83 +/- 0.1 m) were filmed and reconstructed three-dimensionally. Ball release speeds were measured by a previously validated Speedchek Personal Sports Radar (Tribar Industries, Canada). Relationships between selected anthropometric variables and ball release speed and between kinematic variables and ball release speed were investigated using Pearson's product-moment correlation coefficients (r). A significant relationship was found between the horizontal velocity during the pre-delivery stride (r = 0.728, P < 0.05) and ball release speed (31.5 +/- 1.9 m(-1) s(-1)). We believe that the high correlation was due to the bowlers using techniques that allowed them to contribute more of the horizontal velocity created during the run-up to ball release speed. We also found that the angular velocity (40.6 +/- 3.4 rad x s(-1)) of the right humerus had a low correlation (r = 0.358, P > 0.05) with ball release speed. Although the action of the wrist was not analysed because of an inadequate frame rate, we found high correlations between ball release speed and shoulder-wrist length (661 +/- 31 mm; r = 0.626, P < 0.05) and ball release speed and total arm length (860 +/- 36 mm; r = 0.583, P < 0.05). We conclude that the variance in release speed within this group may be accounted for by the difference in radial length between the axis of rotation at the glenohumeral joint and the release point. 相似文献
154.
155.
156.
157.
R S Cooper 《Bulletin of the Medical Library Association》1991,79(2):147-158
The University of California, San Francisco (UCSF), began developing a program for a new library in 1977, started the design in 1985, began construction in 1988, and opened the library in September 1990. The primary objectives were to design and build a facility that would house print collections under optimal conditions, allow for ten years' growth, be flexible enough to permit future reconfiguration, support present and future technologies, and provide beautiful spaces in which to study. The planning process is summarized, planning concepts are outlined, and considerations for the electronic library are briefly reviewed. 相似文献
158.
A method of sorting large textual data-bases by computer using external storage is proposed. The range of sort-keys in a sample of data to be sorted is divided into a fixed set of partitions, which should also give an adequate representation of new data from a similar source. The partitions are composed of ordered key ranges. An incoming data stream is distributed into a series of bins according to the partition in which the key lies, and the bins are then seperately sorted, using an internal sort, to give an ordered file. It is shown how the number of disc accesses needed depends on the manner in which the bins become filled, and thus on statistics of the data. Experiments using an INSPEC data-base give information on which estimates of the efficiency of the method can be based. 相似文献
159.
The nature of project management is change. Even though all knowledge areas in the Project Management Body of Knowledge (PMBOK) are rooted in controlling change, none of these areas specifically addresses the human elements of change. There is a significant distinction between directly controlling change relative to the nonhuman aspects of a project ( change control) and effecting change in the human dimensions of a project through leadership ( change leadership). This article characterizes the distinctive activities of change leadership and change control and their interrelationship throughout the project life cycle. Although distinct, change control and change leadership are interdependent and mutually supporting—both are needed to support project success. 相似文献
160.