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   22029篇
  免费   970篇
  国内免费   574篇
电工技术   222篇
技术理论   12篇
综合类   7150篇
化学工业   1517篇
金属工艺   500篇
机械仪表   729篇
建筑科学   2544篇
矿业工程   282篇
能源动力   166篇
轻工业   530篇
水利工程   238篇
石油天然气   139篇
武器工业   1028篇
无线电   1393篇
一般工业技术   1236篇
冶金工业   1567篇
原子能技术   59篇
自动化技术   4261篇
  2024年   33篇
  2023年   217篇
  2022年   324篇
  2021年   492篇
  2020年   410篇
  2019年   316篇
  2018年   246篇
  2017年   478篇
  2016年   606篇
  2015年   728篇
  2014年   1429篇
  2013年   1129篇
  2012年   1306篇
  2011年   1719篇
  2010年   1612篇
  2009年   1671篇
  2008年   1414篇
  2007年   1416篇
  2006年   1401篇
  2005年   1141篇
  2004年   1004篇
  2003年   1073篇
  2002年   870篇
  2001年   542篇
  2000年   515篇
  1999年   347篇
  1998年   172篇
  1997年   118篇
  1996年   93篇
  1995年   78篇
  1994年   81篇
  1993年   43篇
  1992年   41篇
  1991年   33篇
  1990年   42篇
  1989年   38篇
  1988年   40篇
  1987年   27篇
  1986年   27篇
  1985年   14篇
  1984年   17篇
  1983年   11篇
  1982年   20篇
  1966年   12篇
  1964年   18篇
  1963年   11篇
  1958年   11篇
  1957年   22篇
  1955年   24篇
  1954年   13篇
排序方式: 共有10000条查询结果,搜索用时 31 毫秒
11.
Science of science has become a popular topic that attracts great attentions from the research community. The development of data analytics technologies and the readily available scholarly data enable the exploration of data-driven prediction, which plays a pivotal role in finding the trend of scientific impact. In this paper, we analyse methods and applications in data-driven prediction in the science of science, and discuss their significance. First, we introduce the background and review the current state of the science of science. Second, we review data-driven prediction based on paper citation count, and investigate research issues in this area. Then, we discuss methods to predict scholar impact, and we analyse different approaches to promote the scholarly collaboration in the collaboration network. This paper also discusses open issues and existing challenges, and suggests potential research directions.  相似文献   
12.
13.
Abstract

Like many scientific topics, Human Factors, and Ergonomics concepts are susceptible to being misunderstood by people unfamiliar with the subject matter. Most of the time these misunderstandings are harmless, like when a safety poster within a work setting encourages employees to 'overcome complacency'. This misunderstanding of complacency suggests it is a motivational aspect of human behaviour correctable with encouragement, whereas the human factors approach to overcoming complacency would be to evaluate how task design could diminish the destructive consequences of unexpected changes within a routine setting. No harm comes from the message within the safety poster, other than some wasted ink and paper, but misconceptions among particular audiences can eventually result in dire consequences for the human operator. This paper presents recent evidence that the concepts are being misapplied by casual consumers of human factors, particularly in the aftermath of accidents within complex systems, in ways detrimental to the core mission of improving the well-being of the human operator. Later, because this special issue presents new ways to demonstrate value via return on investment, practical efforts we can take to overcome such misconceptions are suggested.  相似文献   
14.
在经济全球化、文化碰撞融合、价值多元化的开放时代,高职学生的价值观形成遇到挑战。社会主义核心价值观兼顾国家、社会、个人三个层面,是新时代中国发展、社会进步和个人发展的根本指针。高职英语课堂是中西文化交融的前沿阵地。为了培养有德行、有技能的新时代劳动者,最终实现“以德立人、以技立业”,高职英语课堂有责任融入社会主义核心价值观,将知识传授、技能培养与德育相结合。  相似文献   
15.
This educational review postulates the importance of maintaining an adequate level of crystallographic education among structure-dependent scientists whose interests are not primarily in crystallography, at a time when automation and validation have made it possible to obtain high-quality structure analyses in many cases with a minimum of crystallographic background. The topics addressed are intended to form a second round of crystallographic education for a novice user whose first round involved hands-on experience with structure solution and an introduction to elementary concepts. The specific topics, chosen for their relevance as basic knowledge and their lack of emphasis in many formal treatments, are (1) crystallographic reference frames and the utility of the reciprocal cell in geometrical calculations; (2) the relationship between the two concepts that constitute our model of the crystal, namely the unit cell and the lattice; (3) the manner in which an atom is represented in concept and in practice; (4) the importance of interleaved symmetry elements required by the presence of additional symmetry on a lattice; (5) the harnessing of the natural properties of the crystalline state for the potential manipulation of properties of synthetic crystals; and (6) useful terminology for navigating a crystal structure.  相似文献   
16.
崔铁军    李莎莎 《智能系统学报》2020,15(5):998-1005
为将系统故障演化过程(system fault evolution process,SFEP)的文本描述转化为空间故障网络(space fault network,SFN)结构,用于故障分析,本文提出SFEP文本因果关系提取方法,及其与SFN基本结构的转化方法。首先给出SFEP中事件的几种典型因果关系。随后提出因果关系与SFN基本结构的转化流程。本文方法围绕着关键字和因果关系组模式展开,通过模型的不断学习补充和丰富关键字和组模式。最终使方法具备将SFEP文本转化为SFN结构的能力。以飞机起落架故障发生过程文本为例进行了应用,实验结果表明该方法可用于SFEP文本中的因果关系分析,并得到了理想的SFN。完善的关键字和组模式有利于使用计算机智能处理SFEP的SFN。  相似文献   
17.
随着建筑业技术进步和转型升级,高职建筑工程技术专业建设应顺应新时代要求,产教融合,办出特色。本文提出了“四个对接一个融合”的特色专业建设新思考。  相似文献   
18.
This study aims to test two hypotheses: teaching building information modeling (BIM) in relation to construction science provides students with a remarkable understanding of the nature of construction science (Hypothesis 1), and if the student has positive attitude toward the use of the BIM program, then efficiency by which construction science is taught by its means is improved (Hypothesis 2). Results and process of a case study with a novel teaching methodology were discussed in terms of the benefits of the students. A questionnaire study was conducted on the student group with which the case study was performed to test each student's attitude. Results were evaluated statistically. When BIM is integrated with the teaching of basic construction courses within architecture degree programs, the students understood the building system principles simply and effectively. As a result of the statistical analysis, the students find the applied method effective. Moreover, their attitude toward BIM affects the process.  相似文献   
19.
20.
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