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   2949篇
  免费   22篇
  国内免费   16篇
化学   1594篇
晶体学   2篇
力学   59篇
综合类   31篇
数学   551篇
物理学   750篇
  2024年   1篇
  2023年   49篇
  2022年   213篇
  2021年   203篇
  2020年   277篇
  2019年   214篇
  2018年   187篇
  2017年   173篇
  2016年   229篇
  2015年   170篇
  2014年   152篇
  2013年   141篇
  2012年   98篇
  2011年   106篇
  2010年   68篇
  2009年   63篇
  2008年   57篇
  2007年   85篇
  2006年   64篇
  2005年   73篇
  2004年   78篇
  2003年   53篇
  2002年   63篇
  2001年   44篇
  2000年   17篇
  1999年   19篇
  1998年   15篇
  1997年   8篇
  1996年   8篇
  1995年   5篇
  1994年   7篇
  1993年   2篇
  1989年   1篇
  1986年   32篇
  1985年   1篇
  1979年   11篇
排序方式: 共有2987条查询结果,搜索用时 656 毫秒
991.
以"碳的结构与性能及其应用"为例说明元素化学课堂教学中的方法,引导学生在复习碳元素的结构与性质的基础上,组织学生开展课堂讨论,引导学生对不断涌现的新型碳材料的关注和兴趣。同时,分组讨论碳氧化物的结构与化学性质之间关系及其有效利用,即模拟光合作用实现CO2的光催化还原和基于费托合成实现CO为原料制备燃料,鼓励和推进学生开展碳材料及其应用的本科生科研训练,实现课堂知识与科学研究衔接。  相似文献   
992.
Yongqang Wang 《大学化学》2020,35(7):142-150
亲电取代反应是一类基本的有机反应,其中以苯环上的亲电取代反应最常见。该反应的反应活性及反应的位点与苯环上已有的取代基有很大的关系。本文从波谱学的角度,利用核磁数据,阐述了已有的取代基如何影响苯环的电子云密度,进而影响苯环亲电取代反应的活性和取代的位置。本文视角新颖,将对学生的学习及科研产生启发。  相似文献   
993.
Due to COVID-19, all the universities in China has postponed their spring semester. The Ministry of Education issued a call "suspending classes without stopping learning" to require universities to carry out online teaching actively. Up to now, Online teaching has been implemented for nearly eight weeks, and teachers are familiar with online teaching methods. Then, how to hold online courses efficiently and refine course resources have become the main tasks for teachers. This paper elaborates on the practice and skills of rapid improvement of online course and interactive teaching based on "Chaoxing fanya platform and Xuexitong". Using these skills can not only reduce the workload of teachers, but also build high-quality online courses to ensure teaching quality and objectives. This paper could provide a reference for college teachers to implement online teaching efficiently.  相似文献   
994.
The COVID-19 broke out on a large scale, and online teaching became the first choice for teachers. Avoiding network congestion and ensuring learning effects are the dilemmas faced by online teaching. With the help of the UOOC platform and the Tencent Classroom, taking the "Polymer Structure and Performance" course as a sample, we suggested a new "online asynchronous teaching" model. Among them, the SPOC course is convenient for students to manage their learning time; "Chapter Quiz" and "Student-to-Student Mutual Evaluation" are helpful for students to obtain multi-angle feedback; project tasks are focused on case analysis so that students carry out inquiry-based learning. Overall, the "online asynchronous teaching" model breaks the time and space restrictions on teaching and learning, guarantees the quality of teaching during the epidemic, and lays the foundation for creating a "golden class".  相似文献   
995.
Taking the online teaching of "inorganic chemistry" course at Dezhou University as an example, the "six steps before class, six steps in class, six steps after class" online course teaching model based on "Rain Class + Dingding Live" and an online "short class" were constructed. The main content and implementation methods of teaching design, teaching process, teaching effect, teaching reflection, teaching evaluation in online course teaching were discussed. It has been proved in practice that this model can effectively improve students' learning interest and enhance teaching effects.  相似文献   
996.
研究型大学对学生科研思维的培养至关重要,有机化学实验作为近化学专业类学生重要的基础实验课程,对学生操作技能、创新能力和科研思维培养有重要作用。本文以非化学专业本科生有机化学实验"大学化学实验(O)"的教学实践为例,从学生学习方式、教师教学方法、实验教学内容设置等方面阐述如何在教学过程中完成对学生科研思维的培养。  相似文献   
997.
Based on the platform of "QQ share screen + video live broadcast", through the combination of "online theory teaching", "development of home alternative experiment", "game type" experimental operation and "virtual simulation experiment", we carried out the online teaching of polymer material synthesis innovation laboratories, integrating "theory + practice" and "virtual + reality", which is also a good opportunity for labor education. These explorations and practices are expected to provide some references for online teaching of chemical laboratory courses during the COVID-19 epidemic.  相似文献   
998.
Organic chemistry is an important basic course for biology-majored students. Starting from the perspective of stimulating students' interest in learning, breaking through the key and difficult points, and realizing the course education, this paper proposes that teachers should combine the characteristics of biology discipline, strengthen the chemical cognition of biologically functional molecules or biomass components, and promote the cultivation of students' interdisciplinary integration consciousness. At the same time, this paper explores the teaching reform of organic chemistry for biology-majored students so as to lay a foundation for cultivating interdisciplinary talents with comprehensive innovation ability.  相似文献   
999.
以POE教学策略组织教学,尝试用比较思维方法学习碳酸钠、碳酸氢钠的性质,并设计多组实验比较碳酸钠、碳酸氢钠的结构、性质等,以期学生学会用比较思维和化学科学研究的一般步骤。  相似文献   
1000.
化学实景课“污水的重生”,借助互联网技术连线污水处理厂,让教室内的学生亲眼见到污水处理的过程,使学生、技术人员、实景教师、课堂教师等4方实时互动并探究学习。通过实景教学、实验模拟、角色扮演等环节,将理论知识、化学工艺、生活实际融为一体,培养学生的科学物质观、严谨求实的科学精神,令学生在实践中感悟化学与生活、环境、社会的密切联系,驱动学生形成环境保护意识,培养绿色化学观念,增强社会责任感。  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