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   12938篇
  免费   151篇
  国内免费   124篇
教育   8564篇
科学研究   1394篇
各国文化   110篇
体育   1989篇
综合类   19篇
文化理论   126篇
信息传播   1011篇
  2022年   106篇
  2021年   151篇
  2020年   256篇
  2019年   366篇
  2018年   483篇
  2017年   512篇
  2016年   416篇
  2015年   301篇
  2014年   344篇
  2013年   2161篇
  2012年   330篇
  2011年   299篇
  2010年   262篇
  2009年   271篇
  2008年   263篇
  2007年   236篇
  2006年   254篇
  2005年   212篇
  2004年   414篇
  2003年   389篇
  2002年   366篇
  2001年   426篇
  2000年   263篇
  1999年   183篇
  1998年   129篇
  1997年   113篇
  1996年   117篇
  1995年   125篇
  1994年   123篇
  1993年   92篇
  1992年   161篇
  1991年   134篇
  1990年   150篇
  1989年   166篇
  1988年   129篇
  1987年   141篇
  1986年   126篇
  1985年   139篇
  1984年   127篇
  1983年   128篇
  1982年   103篇
  1981年   86篇
  1980年   94篇
  1979年   142篇
  1978年   95篇
  1977年   77篇
  1976年   98篇
  1975年   72篇
  1974年   78篇
  1973年   71篇
排序方式: 共有10000条查询结果,搜索用时 15 毫秒
991.
992.
The preliminary building program suggested in this paper makes use of outlines, graphs, charts, and lists, rather than long-winded paragraphs, to describe the needs, objectives, and philosophy of the library. It is hoped that a short, concise, but detailed, report using these methods will save time and make the report more attractive to read, thereby encouraging the many people who will need to assist in the building planning to use the report.  相似文献   
993.
Embedded programming and real-time signal processing of swimming strokes   总被引:1,自引:1,他引:1  
The research outlined in this paper was conducted to allow real-time processing, transmission and presentation of data to swimming coaches and subsequently their swimmers in a training environment, focused on providing information relevant to strokes in free swimming. This was achieved using a wearable wireless sensor and embedded programming techniques, using accelerations involved in the swimming stroke to provide relevant features for coaches. Current methods used do not offer real-time response to coaches, which results in the lack of real-time feedback and significantly increased post-session analysis time. Filtering and signal processing algorithms are described here, which allow real-time data analysis to be embedded within a wireless sensor node. The system significantly reduces the time for processing acquired data and has delivered a novel monitoring device suitable for operation within the harsh environment of the pool.  相似文献   
994.
对高校健美操教学动作编排和音乐选用技巧的研究   总被引:7,自引:0,他引:7  
运用文献资料法、实践法等方法,对高校健美操教学动作编排和音乐选用进行了初步研究,认为健美操编排设计要有整体性和创新性;动作的选择应充分考虑健美操的自身特点,在编排中要合理运用具有健美操特点的对称组合动作;编排设计应有外型姿态美,要能充分体现出项目的特色和个性特征.健美操动作的主要部分选用快节奏的音乐更容易提高练习者的兴趣和更易于引起观众的共鸣.在开始部分或结束部分选用较慢节奏的音乐能够更充分的表现出快节奏音乐的速度和力度;选用单纯的音乐比带有外文歌曲的音乐可能产生的效果更好.  相似文献   
995.
The key to agricultural development in the eastern region of India, where problems of excess water and water scarcity coexist, is the scientific management of water resources with the adoption of recommended water-management technologies. A vast networking of infrastructure for the development and dissemination of water- management technologies have been designed since the very inception of planned economic change. Despite these concerted efforts, a large number of recommended technologies are either being adopted in piece-meal or not at all. The research and extension systems have been generating and disseminating technologies, therefore, it was felt worthwhile to assess the feasibility and appropriateness of recommended tecnologies as perceived in the first instance by the personnel of the research system and followed by the extension personnel. These steps were felt to be a precursor to screen the recommended technologies for their dissemination and evaluation in different farming systems. The assessment of recommended water-management technologies was performed after their documentation from different organisations working in the field of water management in two eastern India states viz. Orissa and West Bengal. The perception of 30 personnel members of the research system regarding the feasibility of these technologies elucidated that out of 86 documented recommended water-management technologies, 40 were having feasibility scores of ≥ 4.0; 8 technologies with score £ 3.0 and the rest of the 38 technologies with a score between 3.0 and 4.0 on a feasibility continuum range from 1.0 (not feasible) to 5.0 (highly feasible). Out of 40 recommended technologies (already assessed as highly feasible by the research personnel), extension personnel have perceived 16 and 10 technologies as highly appropriate and feasible, respectively. While six and four technologies were found to be less appropriate and feasible, respectively. Correlation of all nine indicators of appropriateness with feasibility of technologies was significant. Five indicators of appropriateness viz. simplicity, physical compatibility, production sustainability, cultural compatibility and cost together constituted 36.8 per cent of the total variation in feasibility with the ‘t’ values and ‘F’ values being significant. It indicates that not appropriateness of technologies alone but other factors influence the feasibility of technologies.  相似文献   
996.
Research Findings: The present study explored the concrete manifestations of autonomy support (AS) toward toddlers. Eight child care educators were interviewed. Based on our assessment, these educators all valued AS. A qualitative content analysis revealed 18 practices that this group of child care educators considered supportive of toddlers’ autonomy. The present findings are in line with the traditional conceptualization of AS, namely, offering choices and encouraging initiatives, acknowledging the child’s feelings and perspective, and providing rationales and explanations for requests (Deci, Eghrari, Patrick, & Leone, 1994; Koestner, Ryan, Bernieri, & Holt, 1984), suggesting that these practices are developmentally appropriate for toddlers. Yet, they also widen the scope of AS, highlighting additional caregiving practices that may support the autonomy of toddlers. Practice or Policy: The results are discussed in light of child care educators’ professional training context and the relationship between AS and structure. The practices found in this study offer many means of actualizing AS with toddlers on a daily basis.  相似文献   
997.
1. Introduction Initial-value problems (IVP) for the differential equations are often confronted with in many fields of science, and are particularly common in engineering. These problems are characterized by a governing differential equation and its associated initial conditions. Methods for solving direct IVP have been known for many decades in the area of differential equation. A few of the more popular methods of solution have proven to provide sufficient and even efficient mechanisms …  相似文献   
998.
This study investigated the relationship among sex, attitude toward intelligence, and self‐estimation of multiple intelligences for self and parents among Portuguese adolescents in secondary schools. Two hundred and forty‐two adolescents estimated their own and their parents' IQ scores on each of Gardner's 10 multiple intelligences: verbal (linguistic), logical (mathematical), spatial, musical, body‐kinesthetic, interpersonal, intrapersonal, existential, spiritual, and naturalistic. They also answered six simple questions concerning intelligence and intelligence tests. There were various sex differences in self‐estimated IQ: males rated themselves higher on overall, mathematical, spatial, intrapersonal, spiritual, and naturalistic IQ compared with females. Multiple regressions indicated that verbal, logical, and intrapersonal intelligence were significant predictors for self and parents overall IQ estimations. Factor analysis of the 10, the 8, and the 7 self‐estimates scores did not confirm Gardner's classification of multiple intelligences. Males were more likely to believe in sex differences in intelligence than females. Results are discussed in terms of the growing literature in the self‐estimates of intelligence, as well as limitations of that approach.  相似文献   
999.

Employability is an increasing concern for university students. Our survey set out to examine university students’ perceptions of their employability and the ways in which these perceptions relate to positions that subsequently connect students to working life: students’ self-representational position or “ability self”, and students’ life-historical positions such as chosen field of study, phase of degree and working life experience. The participants comprised a sample of students (N = 1819) from two Finnish universities, representing diverse fields of study. It was found that apart from the field of study, the perceived proximity to graduation and working life was associated with the perception of employability. Furthermore, a set of self-attributed capabilities was associated with students’ perceptions of employability, particularly extroversion, ambitious competitiveness, mental strength and the desired characteristics of a good employee; however, the attribution of academic skills showed opposing effects. It was concluded that both self-representational and live-historical positions are part of the construction of students’ optimism regarding their employability.

  相似文献   
1000.
This meta-analysis investigated the maturation-related pattern of adaptations to resistance training in boy athletes. We included studies examining the effects of 4–16-week resistance training programmes in healthy boy athletes aged 10–18 years. Pooled estimates of effect size for change in strength across all studies (n = 19) were calculated using the inverse–variance random effects model for meta-analyses. Estimates were also calculated for groups based on likely biological maturity status (“before”, “during” and “after” peak height velocity). Using the standardised mean difference, resistance training increased strength across all groups (effect size = 0.98, [CI: 0.70–1.27]). Strength gains were larger during (1.11 [0.67–1.54]) and after (1.01 [0.56–1.46]) peak height velocity than before (0.5 [?0.06–1.07]). Adaptations to resistance training are greater in adolescent boys during or after peak height velocity. These findings should help coaches to optimise the timing of training programmes that are designed to improve strength in boy athletes.  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