全文获取类型
收费全文 | 32583篇 |
免费 | 2467篇 |
国内免费 | 1428篇 |
专业分类
电工技术 | 2250篇 |
技术理论 | 5篇 |
综合类 | 7834篇 |
化学工业 | 1429篇 |
金属工艺 | 934篇 |
机械仪表 | 2344篇 |
建筑科学 | 3136篇 |
矿业工程 | 546篇 |
能源动力 | 318篇 |
轻工业 | 574篇 |
水利工程 | 452篇 |
石油天然气 | 1200篇 |
武器工业 | 322篇 |
无线电 | 3267篇 |
一般工业技术 | 1381篇 |
冶金工业 | 1398篇 |
原子能技术 | 83篇 |
自动化技术 | 9005篇 |
出版年
2024年 | 158篇 |
2023年 | 456篇 |
2022年 | 810篇 |
2021年 | 1185篇 |
2020年 | 1033篇 |
2019年 | 691篇 |
2018年 | 655篇 |
2017年 | 806篇 |
2016年 | 1009篇 |
2015年 | 1266篇 |
2014年 | 2709篇 |
2013年 | 1992篇 |
2012年 | 2720篇 |
2011年 | 2812篇 |
2010年 | 2256篇 |
2009年 | 2210篇 |
2008年 | 1994篇 |
2007年 | 2054篇 |
2006年 | 1915篇 |
2005年 | 1616篇 |
2004年 | 1357篇 |
2003年 | 1289篇 |
2002年 | 983篇 |
2001年 | 617篇 |
2000年 | 552篇 |
1999年 | 352篇 |
1998年 | 164篇 |
1997年 | 119篇 |
1996年 | 93篇 |
1995年 | 90篇 |
1994年 | 66篇 |
1993年 | 32篇 |
1992年 | 30篇 |
1991年 | 23篇 |
1990年 | 29篇 |
1989年 | 21篇 |
1988年 | 39篇 |
1987年 | 26篇 |
1986年 | 18篇 |
1985年 | 19篇 |
1984年 | 18篇 |
1983年 | 12篇 |
1982年 | 18篇 |
1981年 | 9篇 |
1964年 | 9篇 |
1958年 | 9篇 |
1957年 | 19篇 |
1956年 | 8篇 |
1955年 | 19篇 |
1954年 | 11篇 |
排序方式: 共有10000条查询结果,搜索用时 312 毫秒
11.
ABSTRACT The concept of digital game-based learning (DGBL) evolves rapidly together with technological enhancements of virtual reality (VR) and smart phones. However, the mental workload (MWL) that VR-training applications demand and motivational qualities originating from user experience (UX) should be identified in order to create effective and enjoyable training/learning challenges that fit with individual users’ capabilities. This study examined the effects of reality-based interaction (RBI) and VR on measures of student motivation and MWL, in a mental arithmetic game for secondary school pupils. In a randomised controlled trial with sixty school children, a mental arithmetic game was tested with three different interaction and two different presentation methods – VR RBI, VR head-mounted-display tapping and tablet flick-gesture. Results found a significant effect of RBI on MWL but no differences in enjoyment of training were found between VR-experience and tablet training-experience. In fact, adding the gaming-context to the mental arithmetic task created an enjoyable, motivating experience regardless of presentation or interaction-style. 相似文献
12.
匡红云 《上海第二工业大学学报》2019,(4):298-303
澳大利亚职业教育在全球享有较高的声誉,这与其坚持严格的"基于能力本位的评估"(competency based assessment, CBA)密不可分。介绍了澳大利亚CBA的内涵特征,并详细描述"准备评估、开发评估工具、开展评估、对评估结果进行评估"的CBA运作过程,关注评估工具的开发和后续常规系统性检查及完善,以期对我国的高等职业教育质量评估起到启示和借鉴作用。 相似文献
13.
土木工程施工课程作为土木工程及工程管理专业的学科基础课和核心专业课程,在疫情防控期间"停课不停教""停课不停学"的要求下,通过线上平台进行授课。由于土木工程施工课程内容庞杂、综合性强、实践性强,且章节之间关联性较弱,探究既能使学生快速适应,又能保证教学质量的在线教学方法至关重要。以华南某高校土木工程施工课程为例,基于中国大学MOOC、建筑云课、腾讯课堂、QQ群等线上平台讲授教学内容,并运用问卷调查对课程线上教学效果进行评价。结果表明,线上教学为学生提供了丰富灵活的学习方式,显著提高了学生的自主学习能力,扩大了学生的知识面,达到了较好的学习效果。 相似文献
14.
Determining the factors influencing students’ intention to use m-learning in Jordan higher education
M-learning is characterized as a powerful element of learning and education for facilitating the learning experiences. With enhanced and rapid advancements in technologies of ICTs (Information and Communication Technologies) and mobile, numerous innovative services and applications are being developed. Therefore, it becomes significant to investigate the factors influencing the intentions of m-learning to be used among the students of higher education institution. This study examines the “Technology Acceptance Model” (TAM), “Theory of Reasoned Action” (TRA) and “Unified Theory of Acceptance and Use of Technology” (UTAUT). The study is based on a survey being conducted across diverse groups of students, belonging to different communities and universities. The survey questionnaire was utilized for collecting the relevant data from 250 respondents. The results analyzed yields the impact that the proposed model of m-learning is comprehensive to study in the institutions of higher education. 相似文献
15.
Large lectures are the predominant way of teaching first-year students at universities in Norway. However, this forum for education is seldom discussed as a context for a formative feedback practice. The purpose of this sequential mixed methods study was to address whether and how a student-response system can open for a formative feedback practice in lectures and thereby support students' ability to monitor their own learning, as well as supply insight into how students engage with the feedback in their course work. The context for the study was large lectures (150–200 students) in a qualitative method course for first-year psychology students. Findings from the survey (n = 149) showed a positive correlation between the extent to which students report that they use clickers to monitor their own learning, and the extent to which they report that they used the feedback in their own course work. However, findings indicate that students valued the process of monitoring their own learning during the lectures to a greater extent than they actually used the feedback in their course work. Findings from interviews (n = 6) illustrated various ways students applied feedback in their course work. 相似文献
16.
摘 要:针对城市地理信息平台构建过程中存在的数据获取困难、研发成本较高等问题,
引入开源技术,对基于开源数据、开源开发平台与开源工具的城市地理信息平台构建技术进行
研究。所提出的城市地理信息平台由数据模块与可视化模块 2 部分组成。为构建数据模块,由
开源地理信息项目(OSM)获取了建筑与区划数据,并设计了建筑合并算法以提升数据质量。建
筑数据随之基于行政区划分级存储,通过由 ASP. NET 构建的数据接口提供给具体应用。可视
化模块则基于开源地理信息系统(GIS)项目 Cesium 实现,并设计了完善的用户界面。以北京市
为例,完成了原型系统的开发与测试,证实了该技术体系的可行性,通过开源技术降低平台研
发成本,推进城市地理信息平台的研究与应用。 相似文献
17.
Considering autonomous mobile robots with a variety of specific functions as a kind of service, when there are many types and quantities of services and the density of regional services is large, proposing an algorithm of Circular Area Search (CAS) because of the problem of multi-robot service scheduling in various areas. Firstly, Django is used as the web framework to build the Service-Oriented Architecture (SOA) multi-robot service cloud platform, which is the basic platform for multi-service combination. Then, the service type, the latitude and longitude and the scoring parameters of the service are selected as the service search metrics to design the CAS algorithm that based on the existing service information registered in MySQL and the Gaode Map for screening optimal service, and then providing the service applicant with the best service. Finally, the service applicant applies for the self-driving tour service as an example to perform performance simulation test on the proposed CAS algorithm. The results show that the CAS algorithm of the multi-robot service cloud platform proposed in this paper is practical compared to the global search. And compared with the Greedy Algorithm experiment, the service search time is reduced about 58% compared with the Greedy Algorithm, which verifies the efficiency of CAS algorithm. 相似文献
18.
19.
范文跃 《信息安全与通信保密》2006,(8):66-68
在分析移动智能平台安全需求基础上,从逻辑原理、硬件组成、软件系统三个层面提出了移动智能平台的可信计算体系结构,之后提出了包含十种可信计算应用功能的全景图。 相似文献
20.