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.     

微信平台辅助的农科有机化学实验课混合式教学实践

利用微信公众平台和移动网络辅助教学的优点,改革农科院校中非化学专业公共基础有机化学实验课传统教学模式,构建了“课前翻转教学,课中解惑内化,课后巩固提高”的三段混合式新型教学模式,并对此类教学模式的构建原则,特色微信公众平台建设、应用情况及注意事项进行实践研究。     

无机化学多元信息化教学模式的构建与实践研究

针对现代大学生的移动阅读习惯和信息化学习需求,构建了无机化学多元信息化教学模式。介绍了构建这种教学模式所需微信公众号、微助教和QQ群作业的使用方法。初步探讨了无机化学多元信息化教学模式在教学中的实践效果,弥补了传统教学中的不足。     

基于手机APP实现驻波法对声速的测量

介绍了一种利用普通智能手机和一根两端开口奶茶管基于声驻波现象来测量声速的方法。这种实验方法所用的实验仪器随手可得,无需学生再到学校的实验室进行实验,激发了学生的学习兴趣,增强了学生的动手能力。     

基于微信搭建高校课程教学过程性评价平台

The current process evaluation methods of college curriculum teaching are labor-intensive, inaccurate, and lacking the necessary platform. Taking the advantage of the easiness in use and communication of WeChat, a process evaluation platform was constructed to improve teaching. This WeChat-based platform is proved to be effective in encouraging autonomic learning, improving the learning outcome, and promoting the mutual improvement of students and teachers.     

微信社群互动行为对用户理财产品投资组合风险决策的影响

微信社群如何影响用户理财产品购买决策是当下金融产品营销的一个重要理论问题。本研究依据效价理论提出感知风险、感知收益与用户理财产品的投资组合风险决策的关系模型,并将用户的微信社群互动纳入模型。基于287个用户问卷数据,129个微信社群的互动行为数据,以及用户理财产品实际购买行为的数据分析,发现用户购买理财产品的投资组合风险决策受到其感知风险与感知收益的影响,而且微信社群的互动频率负向影响用户感知风险与用户投资组合风险决策之间的负向关系、微信社群的消极情绪会加强感知风险对用户投资组合风险决策的负向影响并削弱感知利益对于用户投资组合风险决策的正向影响。本研究扩展了有关用户理财产品决策影响因素的分析视角,并对理财产品的用户管理有借鉴价值。     

Spectrophotometric Determination of Palladium with Sodium Ethylene-Bis-Selendglycollate

Abstract

SUMMARY

Palladium was determined spectrophotometrically with sodium ethylene-bis-selenoglycollate in acid medium. The system obeys Beer' law in the range 0.25–0, 3 5 μg.ml^?1 and the molar absorptivity is 2.4 × 10⁴ 1. mol^?1 .cm^?1. Determination of palladium in the presence of many ions is reported.

In spite of the fact that selenium compounds have rarely been used as organic analytical reagents and one finds many palladium determination methods in the literature, this paper fits into the general Purpose reported before ^1,2 :systematic comparison of organic sulphur, sellenium and tellurium compounds as analytical reagents in agreement with propositions made some years agp ^3,4

In previous work⁵ the behaviour of the ethylseleno glycollic (L₁), selenodiglycollic (L₂) and ethylene-bis-selenoglycollic (L₃) anions in acidic solutions of some “soft”, “borderline” and “hard” cations was studied.

The results obtained for Pd(II) afforded evidences that its determination could be run with the three mentioned ligands.

Nevertheless, L₃ was selected because it provides the most sensitive signal and its synthesis is very simple and its overall yield is excellent⁶

From the qualitative study⁵ the foreseen selectivity could present some restrictions, but there is little doubt about the usefulness of the method that will be proposed, in various schemes of determination. Similar comments Beamish have been made about EDTA method for Pd(II) determination⁸     

企业微信在轨道交通移动服务中的应用研究

微信作为移动互联网的新兴传播媒体, 以实时通讯和异步交流等特点受到各行各业的高度关注. 结合宁波轨道交通移动信息化建设中企业微信的应用实例, 探讨了将微信的应用形式集成到轨道交通信息服务中的新方式, 拓宽了企业开展个性化信息服务的途径.     

微视频在无机化学实验教学中的应用

To improve the students' autonomous learning ability and learning enthusiasm in practice course,we introduce micro video,which is short,fast,precise,easy,and fun,into inorganic chemistry laboratory teaching.As an important supplementary means of teaching,micro videos will solve the repeated problems,help students promote study efficiency,provide students with a good way for communication,and improve the students' study enthusiasm.