116号元素和118号元素的合成

在俄罗斯Dubna的联合核研究所（JINR），物理学家们（包括来自美国Lawrence Livermore国家实验室的合作者）用一束钙-48离子轰击锎-249原子产生了少量的118号元素．这些元素原子核的质量为294个原子质量单位．     

时变线性系统特征根判稳的推广

本文研究了二维时变线性系统零解的稳定性，给出了一些允许系数矩阵主对角元变号，系数矩阵特征根变号的判定稳定性的充分条件。     

月球,人类航天的“加速器”

 2003年10月15日,是一个永载中华民族和人类文明史册的日子。我国第一艘载人飞船“神舟”五号发射升空。在绕地球环行14周后,16日6时23分,我国自己培养的航天员杨利伟乘返回舱在内蒙古预定地区安全落地,我国首次载人航天飞行取得圆满成功。中国人第一次乘自行研制的宇宙飞船,实现了飞向太空的历史性跨越。这是我国航天事业和国防科技事业发展史上一座新的里程碑,开创了我国科学技术发展的新纪元。辽阔无垠的宇宙令人神往。航天技术的发展极大地扩展了人类活动的新领域,带来了传统技术无法达到的经济和社会效益,同时它的发展也成为体现一个国家综合国力和当代科学发展水平的重要特征。     

卫星定位系统简介

 随着科学技术的不断进步和发展,当今社会已进入电子信息时代。快速、准确的卫星定位在军事、国民经济等诸多领域中广泛应用。目前能够实现全球卫星定位服务的,有美国的全球定位系统(GlobalPositioningSystem,简称GPS)和俄罗斯的“格洛纳斯”(GLONASS)全球导航系统(GLONASS为全球卫星导航系统的缩写),中国也有自己的区域性卫星定位系统“北斗一号”。卫星定位服务现已成为全球公认的八大无线产业之一。本文首先以GPS和“北斗一号”为例介绍卫星定位的基本原理,然后详细介绍各种已有和正在建设的卫星定位系统。     

如何区分与正确使用“分节号”与“小数点”

书写阿拉伯数字时，必须写上分节号和小数点，我在授课中着重强调过多次这个同题，但个别同学还是有些不注意这方面的细节。结果出现了许多的错误，有的同学认为算盘打的准、打的快就行，没有必要在乎一个小小的分节号和小数点，这种观点是不对的。针对这种问题，我在实际教学中把它当做重点加以强调。     

基于企业微信平台和在线教育综合平台的线上教学实践

In order to achieve "postponement of school without suspension of learning" during the prevention and control of new coronavirus pneumonia, the online teaching strategy was constructed based on Enterprise WeChat and Integrated Online Education Platform for the online teaching of Separation Science and Technology. The student-centered teaching methods were applied in online teaching process.     

“线上线下-虚实结合”在有机化学实验教学中的应用探索——以正溴丁烷的制备实验为例

In response to the impact of the Covid-19 epidemic on organic chemistry laboratory teaching, this article analyzes and discusses the current limitation of traditional organic chemistry laboratory teaching. Taking the "preparation of n-bromobutane" as an example, a new "online-offline and virtual-actual combination" teaching mode with the combination of "Tencent Meeting, MLabs, laboratory and WeChat group" is introduced. The practice of the new mode of teaching includes the following steps: pre-class online guiding by teacher, student preview and practice based on the virtual simulation platform, students and teacher discussion and operation in laboratory, and post-classcomprehensive assessment and Q&A", and good teaching effects have been received. It is significant in cultivating and improving the independent innovation and practical ability, and provides reference for the organic chemistry laboratory teaching reform and also lays a foundation for the construction of "outstanding course" of organic chemistry.     

Study on blind band elimination in jitter estimation

We propose a blind spot elimination method based on an improved layout of CCD in spacecraft jitter estimation. At least three CCDs are required and designed with two pairs of overlapping area and one non-overlapping pair. The two number of lines in space of overlapping pairs are made coprime to minimize the number of common blind spots. The third non-overlapping pair is arranged with the space less than the quotient of the least line frequency and bandwidth. It is used to eliminate the aliasing blind frequencies of the first two overlapping pairs. Experimental results prove the effectiveness of the blind band elimination.     

专利

色谱级四氯化碳的制备方法 公开号：CN102267864A 公开日：2011．12．07 申请人：天津市化学试剂研究所