全文获取类型
收费全文 | 1416篇 |
免费 | 54篇 |
国内免费 | 25篇 |
专业分类
电工技术 | 19篇 |
技术理论 | 1篇 |
综合类 | 129篇 |
化学工业 | 131篇 |
金属工艺 | 28篇 |
机械仪表 | 51篇 |
建筑科学 | 228篇 |
矿业工程 | 25篇 |
能源动力 | 24篇 |
轻工业 | 68篇 |
水利工程 | 27篇 |
石油天然气 | 45篇 |
武器工业 | 1篇 |
无线电 | 112篇 |
一般工业技术 | 99篇 |
冶金工业 | 114篇 |
原子能技术 | 11篇 |
自动化技术 | 382篇 |
出版年
2024年 | 6篇 |
2023年 | 12篇 |
2022年 | 14篇 |
2021年 | 33篇 |
2020年 | 61篇 |
2019年 | 71篇 |
2018年 | 35篇 |
2017年 | 24篇 |
2016年 | 27篇 |
2015年 | 44篇 |
2014年 | 66篇 |
2013年 | 64篇 |
2012年 | 62篇 |
2011年 | 93篇 |
2010年 | 96篇 |
2009年 | 66篇 |
2008年 | 74篇 |
2007年 | 58篇 |
2006年 | 57篇 |
2005年 | 63篇 |
2004年 | 49篇 |
2003年 | 45篇 |
2002年 | 50篇 |
2001年 | 34篇 |
2000年 | 33篇 |
1999年 | 31篇 |
1998年 | 18篇 |
1997年 | 8篇 |
1996年 | 11篇 |
1995年 | 16篇 |
1994年 | 17篇 |
1993年 | 8篇 |
1992年 | 7篇 |
1991年 | 12篇 |
1990年 | 7篇 |
1989年 | 5篇 |
1987年 | 4篇 |
1986年 | 4篇 |
1985年 | 13篇 |
1984年 | 13篇 |
1983年 | 11篇 |
1981年 | 17篇 |
1980年 | 6篇 |
1977年 | 4篇 |
1975年 | 3篇 |
1969年 | 5篇 |
1968年 | 4篇 |
1965年 | 4篇 |
1963年 | 3篇 |
1954年 | 3篇 |
排序方式: 共有1495条查询结果,搜索用时 15 毫秒
51.
智能科学与技术专业毕业生情况分析与专业建设 总被引:4,自引:4,他引:0
针对南开大学"智能科学与技术"新兴本科专业,对首届学生的来源和去向进行整理和分析,根据毕业生的座谈与反馈情况,提出南开大学"智能科学与技术"专业的调整方向与后续建设目标。 相似文献
52.
53.
54.
在多媒体辅助教学中,教学设计直接影响教学效果。认知心理学的发展,尤其是R.E.Mayer提出的多媒体教学理论给我们提供了一个研究教学设计规则的依据。描述同多媒体教学相关的认知心理学的几个基本理论,在此基础上提出一些关于提高多媒体辅助教学效果的教学设计方法。 相似文献
55.
In this study, the effect of animation enhanced conceptual change texts (CCT–CA) on grade 6 students’ understanding of the particulate nature of matter (PNM) and transformation during the phase changes was investigated. A quasi-experimental design and one control group (CG, N = 25) and one experimental group (EG, N = 26) were used. While the control group taught traditional instruction, the experimental group received CCT–CA instruction. Two different tests, The Particulate Nature of Matter Concept Test (ParNoMaC) and The Transformation of Matter Statement Test (ToMaSaT), were administered as pretest, posttest and delayed test to collect data. Results indicate that while there is no statistically significant difference between groups in pretest, performance of EG students is greater than the CG ones in posttest and delayed test. And also, the EG students are better in remediating their alternative conceptions related to the PNM and transformations during the phase changes. Based on the study, it is concluded that CCT–CA combination may be effective way to improve students’ understanding of basic science and chemical concepts. 相似文献
56.
Shaowen Wang Yan Liu Nancy Wilkins-Diehr Stuart Martin 《Computers & Geosciences》2009,35(12):2283-2294
Cyberinfrastructure science and engineering gateways have become an important modality to connect science and engineering communities and cyberinfrastructure. The use of cyberinfrastructure through gateways is fundamental to the advancement of science and engineering. However, learning science gateway technologies and developing science gateways remain a significant challenge, given that science gateway technologies are still actively evolving and often include a number of sophisticated components. A geosciences gateway must be designed to accommodate legacy methods that geoscientists use in conventional computational tools. The research described in this paper establishes an open-source toolkit—SimpleGrid for learning and developing science gateways based on a service-oriented architecture using a component-based approach that allows flexible separation and integration of the components between geocomputation applications and cyberinfrastructure. The design and implementation of SimpleGrid is based on the National Science Foundation TeraGrid—a key element of the U.S. and world cyberinfrastructure. This paper illustrates our experience of using SimpleGrid and a spatial interpolation method in a tutorial to teach TeraGrid science gateways. 相似文献
57.
The evaluation of cluster policy by fuzzy MCDM: Empirical evidence from HsinChu Science Park 总被引:1,自引:0,他引:1
Chia-Chi Sun Grace T.R. Lin Gwo-Hshiung Tzeng 《Expert systems with applications》2009,36(9):11895-11906
In the recent years, industrial clusters have received considerable attention from economists and industrial analysts, because they are seen as the main reason for economic growth and success of certain economic region. This study systematically reviews past researches of industrial cluster. The purpose of this paper is to contribute to the understanding of this issue regarding the driving forces for the growth of industrial cluster and find out the priority among these cluster policies. Taiwan HsinChu Science Park is a prime example for this paper, and its connection with the innovative participators. We begin with an examination of the literature on cluster about its driving forces and policies upon which we propose a conceptual framework. In doing so, we explore the cluster-based industrial system. Then this research adopts the Fuzzy Analytic Hierarchy Process as the analytical tool. The Fuzzy Analytic Hierarchy Process method is used to determine the weightings for evaluation dimension among decision makers. From our research results, the Factor Conditions is the most important driving force for advancing the industrial cluster performance. Moreover, the promotion of international linkages policy and broader framework policies rank the first two priorities for cluster policy. Overall, this paper concludes with some simulations of cluster policy alternatives confronting the industry and the Taiwanese government. 相似文献
58.
针对国家科技基础条件平台中大型仪器、设备等共享的需求,提出基于思杰(Citrix)的异地软件共享解决方案,其中包括系统原理、设计与实现的描述。经过用户试用,证明该方案可行,有助于提高大型软件的利用率,减少大型软件的购买费用,符合科技基础条件平台资源共享与整合的建设原则。 相似文献
59.
This study investigated the effects of the use of augmented reality (AR) technologies in science laboratories on university students' laboratory skills and attitudes towards laboratories. A quasi-experimental pre-test/post-test control group design was employed. The participants were 76 first-year university students, aged 18–20 years old. They were assigned to either an experimental or a control group. Qualitative and quantitative data collection tools were used. The experimental results obtained following the 5-week application revealed that the AR technology significantly enhanced the development of the university students' laboratory skills. AR technology both improved the students’ laboratory skills and helped them to build positive attitudes towards physics laboratories. The statements of the students and the instructor regarding other effects of AR technology on science laboratories, both negative and positive, are also discussed. 相似文献
60.