全文获取类型
收费全文 | 2924篇 |
免费 | 21篇 |
国内免费 | 23篇 |
专业分类
教育 | 1602篇 |
科学研究 | 445篇 |
各国文化 | 3篇 |
体育 | 592篇 |
综合类 | 51篇 |
文化理论 | 13篇 |
信息传播 | 262篇 |
出版年
2024年 | 8篇 |
2023年 | 12篇 |
2022年 | 28篇 |
2021年 | 10篇 |
2020年 | 9篇 |
2019年 | 9篇 |
2018年 | 7篇 |
2017年 | 7篇 |
2016年 | 18篇 |
2015年 | 22篇 |
2014年 | 40篇 |
2013年 | 45篇 |
2012年 | 206篇 |
2011年 | 298篇 |
2010年 | 117篇 |
2009年 | 40篇 |
2008年 | 203篇 |
2007年 | 196篇 |
2006年 | 222篇 |
2005年 | 166篇 |
2004年 | 149篇 |
2003年 | 141篇 |
2002年 | 127篇 |
2001年 | 88篇 |
2000年 | 89篇 |
1999年 | 84篇 |
1998年 | 16篇 |
1997年 | 30篇 |
1996年 | 23篇 |
1995年 | 27篇 |
1994年 | 35篇 |
1993年 | 37篇 |
1992年 | 31篇 |
1991年 | 30篇 |
1990年 | 27篇 |
1989年 | 42篇 |
1988年 | 16篇 |
1987年 | 28篇 |
1986年 | 34篇 |
1985年 | 32篇 |
1984年 | 19篇 |
1983年 | 21篇 |
1982年 | 26篇 |
1981年 | 16篇 |
1959年 | 11篇 |
1958年 | 9篇 |
1957年 | 9篇 |
1956年 | 11篇 |
1955年 | 9篇 |
1954年 | 10篇 |
排序方式: 共有2968条查询结果,搜索用时 15 毫秒
91.
92.
Warranting scientific belief 总被引:1,自引:0,他引:1
93.
We analysed the decisions of major European public funding organisations to fund or not to fund synthetic biology (SB) and related ethical, legal and social implication (ELSI) studies. We investigated the reaction of public organisations in six countries (Austria, France, Germany, the Netherlands, Switzerland and the U.K.) towards SB that may influence SB's further development in Europe. We examined R&D and ELSI communities and their particular funding situation. Our results show that the funding situation for SB varies considerably among the analysed countries, with the U.K. as the only country with an established funding scheme for R&D and ELSI that successfully integrates these research communities. Elsewhere, we determined a general lack of funding (France), difficulties in funding ELSI work (Switzerland), lack of an R&D community (Austria), too small ELSI communities (France, Switzerland, Netherlands), or difficulties in linking existing communities with available funding sources (Germany), partly due to an unclear SB definition. 相似文献
94.
Tunable pores (TPs) have been used for resistive pulse sensing of 1 μm superparamagnetic beads, both dispersed and within a magnetic field. Upon application of this field, magnetic supraparticle structures (SPSs) were observed. Onset of aggregation was most effectively indicated by an increase in the mean event magnitude, with data collected using an automated thresholding method. Simulations enabled discrimination between resistive pulses caused by dimers and individual particles. Distinct but time-correlated peaks were often observed, suggesting that SPSs became separated in pressure-driven flow focused at the pore constriction. The distinct properties of magnetophoretic and pressure-driven transport mechanisms can explain variations in the event rate when particles move through an asymmetric pore in either direction, with or without a magnetic field applied. Use of TPs for resistive pulse sensing holds potential for efficient, versatile analysis and measurement of nano- and microparticles, while magnetic beads and particle aggregation play important roles in many prospective biosensing applications. 相似文献
95.
采用核心自我评价量表、工作投入量表、心理授权量表和不匹配感知量表对16家企业447名新生代员工进行调查,通过层级回归分析新生代员工核心自我评价与工作投入的关系,以及考察心理授权与过度教育在此关系中发挥的作用。结果表明:(1)新生代员工核心自我评价对工作投入有显著正向影响;(2)心理授权在核心自我评价和工作投入关系中有着部分中介效应;(3)过度教育对心理授权中介效应的调节作用成立,对过度教育的高感知不仅削弱了核心自我评价与心理授权的正向关系,也进而弱化了心理授权对工作投入的积极作用。 相似文献
96.
This article focuses on nonsigning hearing parents of deaf children who share the goals of bilingual-bicultural (BiBi) programs for their child, opt for their home language to be their deaf child's first language (L1), and have questions about communication options (e.g., oral methods, manually coded English [MCE] systems, or Cued Speech) for conveying that language. We present research findings related to the effectiveness of MCE systems and Cued Speech for conveying English and developing deaf children's reading abilities. We compare the cueing of English and the signing of MCE systems in terms of theoretical and practical advantages. Finally, we suggest research needs. 相似文献
97.
98.
99.
Rachel K. Katch Samantha E. Scarneo William M. Adams Lawrence E. Armstrong Luke N. Belval Julie M. Stamm Douglas J. Cas 朱为模审校 《体育科研》2018,(2):31-46
参加有组织的体育运动和休闲活动存在发生严重伤病甚至死亡的内在风险。虽然造成体育运动或体育活动中猝死的原因有很多,但运动医学和循证标准治疗方面的进展已使临床医生得以更有效地预防、发现和治疗可能致死的伤患。随着研究与技术不断发展进步,当前的治疗标准正在不断发展以更好地改善患者的治疗效果。本文提出了10个与运动和体育活动中猝死的主要原因及其治疗手段有关的关键问题,未来开展的研究将提高运动员和休闲运动爱好者参与运动的安全度。当前证据表明,如采取正确的预防策略或最佳治疗方案,绝大多数的死亡案例是可以避免的。 相似文献
100.
The emerging reading and spelling abilities of 24 deaf and 23 hearing beginning readers were followed over 2 years. The deaf children varied in their language backgrounds and preferred mode of communication. All children were given a range of literacy, cognitive and language-based tasks every 12 months. Deaf and hearing children made similar progress in literacy in the beginning stages of reading development and then their trajectories began to diverge. The longitudinal correlates of beginning reading in the deaf children were earlier vocabulary, letter-sound knowledge, and speechreading. Earlier phonological awareness was not a longitudinal correlate of reading ability once earlier reading levels were controlled. Only letter name knowledge was longitudinally related to spelling ability. Speechreading was also a strong longitudinal correlate of reading and spelling in the hearing children. The findings suggested that deaf and hearing children utilize slightly different reading strategies over the first 2 years of schooling. 相似文献