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   15845篇
  免费   668篇
  国内免费   230篇
电工技术   131篇
技术理论   4篇
综合类   6419篇
化学工业   872篇
金属工艺   413篇
机械仪表   555篇
建筑科学   2064篇
矿业工程   86篇
能源动力   39篇
轻工业   225篇
水利工程   124篇
石油天然气   62篇
武器工业   3篇
无线电   817篇
一般工业技术   605篇
冶金工业   1049篇
原子能技术   15篇
自动化技术   3260篇
  2024年   27篇
  2023年   167篇
  2022年   251篇
  2021年   391篇
  2020年   315篇
  2019年   240篇
  2018年   180篇
  2017年   159篇
  2016年   271篇
  2015年   402篇
  2014年   1007篇
  2013年   800篇
  2012年   1005篇
  2011年   1223篇
  2010年   1249篇
  2009年   1245篇
  2008年   1091篇
  2007年   1001篇
  2006年   994篇
  2005年   844篇
  2004年   751篇
  2003年   824篇
  2002年   686篇
  2001年   374篇
  2000年   365篇
  1999年   228篇
  1998年   102篇
  1997年   59篇
  1996年   44篇
  1995年   42篇
  1994年   36篇
  1993年   20篇
  1992年   23篇
  1991年   20篇
  1990年   19篇
  1989年   17篇
  1988年   30篇
  1987年   23篇
  1986年   15篇
  1984年   11篇
  1983年   8篇
  1982年   15篇
  1981年   8篇
  1972年   8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 250 毫秒
21.
22.
The aim of the present paper is to explore the efficiency of Spanish schools while simultaneously considering data envelopment analysis (DEA) and multivariate analysis. Test scores from the Program for International Assessment reports are used as outputs while the resources of each institution are considered as inputs to the analysis. The methodology utilized determines the DEA efficiencies under various input/output combinations and the results are interpreted through the application of factor analysis and property‐fitting techniques. The objective of the study is to identify the strengths and weaknesses of each type of school and the connections with the way in which the efficiency is obtained. In the light of the results, the study concludes that there exist differences related with two of the criteria considered: the type of management of the schools and the parental socioeconomic level of the students. However, no differences appear when the geographical location of the institutions is considered to characterize the entities.  相似文献   
23.
运用现象学的“回到事情本身”与“本质直观”的方法,可以使人们深入理解设计的本质。设计是善的目的及其可视化表达,设计思维是指向“人的自由”的目的思维,设计思维的每个阶段都贯穿着人的自由。设计教育应立足于设计思维的本质,从设计判断力、设计表达力、设计创造力等方面培养学生的自由创造精神。  相似文献   
24.
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   
25.
Teachers regulating groups of students during computer-supported collaborative learning (CSCL) face the challenge of orchestrating their guidance at student, group, and class level. During CSCL, teachers can monitor all student activity and interact with multiple groups at the same time. Not much is known about the way teachers diagnose student progress and decide upon appropriate interventions when they regulate multiple groups synchronously. This explorative study describes the strategies and experiences related to regulating the activities of seven groups of students, as reported by two teachers, and aimed to widen the framework for describing teacher regulation of CSCL settings that are characterized by synchronicity. Recurring themes included the high amount of information load teachers experienced while diagnosing students’ needs, the focus and level of regulation, and the way the teachers used prior knowledge of students to decide on an intervention after diagnosis. Both teachers valued the ability to monitor student progress online, and mentioned the necessity of students being able to follow the teacher’s activity as well. Theoretical implications are described in terms of understanding teacher regulation, synchronicity, and information load. Practical implications are described for lowering information load.  相似文献   
26.
The paper is mainly to explore the automated music composition experiences for the students in the high grades of elementary school who are unfamiliar with the professional music theory. The proposed Automated Composition for Music Education (ACME) software was developed to help the students to compose the rhythm and melody themselves, while chord configuration and arrangement are automatically generated. Subsequently, sixth-year students of a non-experimental school were recruited to use the software for the completion of its development. Analysis of learning effectiveness at the reaction level, analysis of learning-level learning effectiveness, correlation analysis of the reaction- and learning-levels learning effectiveness has been performed with a significant result. The correlations between each component of learning effectiveness at the reaction and learning levels were also found. Finally the students in the experimental group using the ACME teaching materials showed a better learning effectiveness at both reaction level and learning level, than those of the students in the comparison group.  相似文献   
27.
The concerns about the consequences of mental problems related to use of social media among university students have recently raised consciousness about a relatively new phenomenon termed Fear of Missing Out (FoMO). Drawing on the self-determination theory and on the assumption that low levels of basic need satisfaction may relate to FoMO and social media engagement, the aim of the present research was to examine for the first time possible links between FoMO, social media engagement, and three motivational constructs: Intrinsic, extrinsic and amotivation for learning. Data were gathered from 296 undergraduate students by using the following scales: Social Media Engagement (SME), Fear of Missing Out (FoMOs) and Academic Motivation. The SME is a new scale, specifically designed for this study to measure the extent to which students used social media in the classroom. This scale includes three categories: Social engagement, news information engagement and commercial information engagement. Path analysis results indicated that the positive links between social media engagement and two motivational factors: Extrinsic and amotivation for learning are more likely to be mediated by FoMO. Interpretation of these results, their congruence within the context of the theoretical frameworks and practical implications are discussed.  相似文献   
28.
School educators play an important role in cyberbullying management. Since scarce earlier research indicated low perceived competence of school educators in handling cyberbullying, more insight is needed in what determines their actions and how to improve these practices. This study assessed school educator practices, their perceptions and context factors from a behavior change theoretical framework, and investigated educator clusters related to this. An online survey was conducted among 451 secondary school educators (teachers, principals, school counselors). School educators mostly used recommended actions (i.e. conversations with pupils, enlisting professionals for support, parental involvement, providing supportive victim advice). Four educator clusters were identified: ‘referrers’ (65%), ‘disengaged’ educators (14%), ‘concerned’ educators (12%) and ‘use all means’ educators (9%). The first two clusters were less adept at handling cyberbullying and comprised mostly teachers, particularly indicating a need for training teachers. Our findings show a need for tailored educator training, e.g. by job position, gender, school size and grade. The behavior change theoretical framework can help target educators' particular needs.  相似文献   
29.
分析了广西水利行业职工队伍的结构及其存在的问题,介绍了广西水利电力职业教育集团的基本情况,论述了该集团的运作方式及其在基层水利人才队伍建设中进行的有益的探索,探讨了集团今后的发展思路。  相似文献   
30.
Many argue that digital technologies have the potential to enhance the teaching and learning of mathematics. However, the availability of technology is not sufficient to realise this potential. The study reported takes a detailed approach to investigate the utility of the particular offerings of the available technologies in the teaching and learning of a specific area of mathematics, functions. Sixteen affordances identified in the data are described. The complexity of the process involved in resolving a situation where particular affordances would be useful so as they are perceived and enacted is detailed. Finally, a grounded theory framework arising from the data analysis from this study that can be used to explain, predict and guide action in other digital environments is presented.  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