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   10195篇
  免费   128篇
  国内免费   20篇
教育   6991篇
科学研究   1080篇
各国文化   101篇
体育   1032篇
综合类   6篇
文化理论   107篇
信息传播   1026篇
  2021年   75篇
  2020年   134篇
  2019年   199篇
  2018年   265篇
  2017年   290篇
  2016年   250篇
  2015年   174篇
  2014年   240篇
  2013年   1901篇
  2012年   223篇
  2011年   219篇
  2010年   191篇
  2009年   174篇
  2008年   203篇
  2007年   205篇
  2006年   180篇
  2005年   162篇
  2004年   154篇
  2003年   184篇
  2002年   153篇
  2001年   187篇
  2000年   177篇
  1999年   172篇
  1998年   79篇
  1997年   84篇
  1996年   114篇
  1995年   86篇
  1994年   104篇
  1993年   98篇
  1992年   166篇
  1991年   157篇
  1990年   146篇
  1989年   146篇
  1988年   117篇
  1987年   130篇
  1986年   155篇
  1985年   145篇
  1984年   114篇
  1983年   142篇
  1982年   119篇
  1981年   107篇
  1980年   102篇
  1979年   181篇
  1978年   119篇
  1977年   114篇
  1976年   110篇
  1975年   86篇
  1974年   95篇
  1972年   77篇
  1971年   75篇
排序方式: 共有10000条查询结果,搜索用时 15 毫秒
91.
Strategic planning and priority-setting have become inevitable for UK research funding agencies in the 1990's. But it is an activity which is viewed with some suspicion by the scientific community, in which it is an aphorism that discovery cannot be planned. There is considerable interest therefore, in the promise offoresight analysis as an alternative to conventional strategic planning. Most previous experience with foresight has been at a macro level, with a focus on national direction-setting. But what role can foresight have at amicro level; how can it help individual funding agencies develop strategies for specific scientific fields? This paper explores the problem by describing an experiment, supported jointly by three UK funding agencies, to apply foresight techniques in a review of a single field (cardiovascular research). The methodology developed for objective consultation with scientists and users is described, and preliminary results presented. Science-push and demand-pull factors emerged clearly, aa did a desire within the scientific community for a number of infrastructural changes to strengthen the future of the field. The study has shown that systematic surveys of users and researchers are capable of detecting coherent views on a number of issues that are relevant to forward planning in research funding agencies. The paper concludes by summarising the limitations of this approach to strategic planning, and presenting some general lessons that may be useful for consideration in other micro-level foresight exercises.  相似文献   
92.
The concept of “open access” to scientific and teaching information has become one of the specific forms of the worldwide trend towards the formation of global interactive knowledge. This paper presents the basic information on open access (OA) to scientific and teaching information, its current status, financing options, problems and prospects of development, and the participation of Russia in this process.  相似文献   
93.
The main aspects of the creation of a monitoring system for the research activities of the members of a higher-education institution are considered. The scientific activities of the lecturers and members of Turgenev Orel State University is used as the basis. It is expected that this system will be an efficient tool for optimal managerial decisions at all levels.  相似文献   
94.

Key points

  • U.S. university OA policies are far less mandatory than those in the U.K.
  • The waiver clauses in U.S. university policies make it easy for authors to decline making their articles OA.
  • The relative autonomy – and competitiveness – of U.S. universities may be the reason for weaker OA policies.
  • OA in the U.S. is likely to be driven by government funding agency policies rather than by academia.
  相似文献   
95.
In this interview, conducted via email during August 2016, Dr. Arlene G. Taylor discusses her career as a cataloger, professor of cataloging and classification, and her work in professional associations. Topics include her early cataloging and teaching experiences, changes in both cataloging practice and the teaching of cataloging, subject analysis, and “aboutness” as compared with form/genre access, professional experiences outside the United States, and the future of MLIS programs.  相似文献   
96.
Although static stretching (SS) is utilized during warm-up before training and competition, the results about its effects on performance remain controversial. We examined whether performing a stretch of short-to-moderate duration (<60 sec) in a single repetition produces a similar or different effect on speed and agility performance from the effect which is produced while performing the same stretch in multiple repetitions of the same total duration. According to a repeated measurement design, 40 trained males were randomly assigned to either (1) a single repetition group or (2) a multiple repetition group. The participants in each group performed five trials: a control trial (no stretches were performed) and four experimental trials of SS protocols consisting of five exercises performed at either 20 sec (2 × 10 in the second group), 30 sec (3 × 10 in the second group), 40 sec (4 × 10 in the second group) or 60 sec (6 × 10 in the second group) of total duration. A two-way repeated measures analysis of variance showed that the participants in both group improved their speed performance in response to the 20-sec trial, whereas agility remained unaffected. Data analysis also revealed that the repetition number did not affect speed and agility performance. These data suggest that SS of short duration (<30 sec) may actually improve acute speed performance, whereas SS of moderate duration may not hamper speed and agility performance. Moreover, the effects of SS protocols are related to the total duration of each exercise and not to the number of repetitions in which each exercise is performed.  相似文献   
97.
We examined the effectiveness of perceptual training on the performance of handball goalkeepers when anticipating the direction of both direct and deceptive 7-m throws. Skilled goalkeepers were assigned equally to three matched-ability groups based on their pre-test performance: a perceptual training group (= 14) received video-based perceptual training, a placebo training group (= 14) received video-based regular training and a control group received no training. Participants in the perceptual training group significantly improved their performance compared to both placebo and control groups; however, anticipation of deceptive throws improved less than for direct throws. The results confirm that although anticipating deception in handball is a challenging task for goalkeepers, task-specific perceptual training can minimise its effect and improve performance.  相似文献   
98.
This study investigated the acute endocrine responses to a 164-km road cycling event in a hot environment. Thirty-four male experienced cyclists (49.1 ± 8.3 years, 86.8 ± 12.5 kg, 178.1 ± 5.1 cm) participating in a 164-km road cycling event were recruited. Blood samples were collected within 0.3–2.0 h before the start (PRE: ~0500–0700 h) and immediately following the ride (POST). Samples were analysed for testosterone, growth hormone (GH), cortisol and interleukin-6 (IL-6). The temperature and humidity during the event were 35.3 ± 4.9°C and 47.2 ± 14.0%, respectively. Based on the finishing time, results for the fastest (FAST, 305 ± 10 min) and the slowest (SLOW, 467 ± 31 min) quartiles were compared. At POST, testosterone concentration was significantly (P < 0.05) lower (PRE, 20.8 ± 8.6; POST, 18.2 ± 6.7 nmol · L?1), while GH (PRE, 0.3 ± 0.1; POST, 2.3 ± 0.3 µg · L?1), cortisol (PRE, 661 ± 165; POST, 1073 ± 260 nmol · L?1) and IL-6 (PRE, 4.0 ± 3.4; POST, 22.4 ± 15.2 pg · mL?1) concentrations were significantly higher than those at PRE. At POST, GH and cortisol were significantly higher for the FAST group than for the SLOW group (GH, 3.6 ± 2.0 and 1.0 ± 0.8 µg · L?1; cortisol, 1187 ± 209 and 867 ± 215 nmol · L?1). Participation in an ultra-endurance road cycling event in a hot environment induced significant acute changes in concentrations of circulating hormones, with a greater augmentation of GH and cortisol in those completing the ride fastest.  相似文献   
99.
The objective of the present study was to investigate the effects of combined training without caloric restriction on inflammatory markers in overweight girls. Thirty-three girls (13–17 years) were assigned into overweight training (n = 17) or overweight control (n = 16) groups. Additionally, a normal-weight group (n = 15) was used as control for the baseline values. The combined training programme consisted of six resistance exercises (three sets of 6–10 repetitions at 60–70% 1 RM) followed by 30 min of aerobic exercise (walking/running) at 50–80% VO2peak, performed in the same 60 min session, 3 days/weeks, for 12 weeks. Body composition, dietary intake, aerobic fitness (VO2peak), muscular strength (1 RM), glycaemia, insulinemia, lipid profile and inflammatory markers (C-reactive protein, interleukin-6, tumour necrosis factor-alpha, interleukin-10, leptin, resistin and adiponectin) were measured before and after intervention. There was a significant decrease in body fat (< 0.01) and increase in fat-free mass (< 0.01), VO2peak (< 0.01), 1 RM for leg press (< 0.01) and bench press (< 0.01) in the overweight training group. Concomitantly, this group presented significant decreases in serum concentrations of C-reactive protein (< 0.05) and leptin (< 0.05), as well as in insulin resistance (< 0.05) after the experimental period. In conclusion, 12 weeks of combined training without caloric restriction reduced inflammatory markers associated with obesity in overweight girls.  相似文献   
100.
While the career experiences and trajectories of various sports workers have received increased scholarly attention, those of professional coaches have, in comparison, received scant consideration. This paper focuses on the career experiences of Maeve (a pseudonym), a high performance coach, and the critical incidents related to the creation, development, and, ultimately, questioning of her professional identity. Data were collected through a series of narrative-biographical interviews and were subject to a process of iterative data analysis. The results indicated that her significant investment into her coaching self, combined with the vagaries and uncertain nature of work in high performance coaching, led her to experience a biographical disruption that interrupted the narrative coherence of her coaching life. The findings add further credence to recent critiques of only understanding and representing coaching careers in a linear and chronically staged fashion.  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