Educational effects in an experiment with the management game SINTO-Market

This paper examines how the educational background influences the performance of managers’ strategies. The research is based on data collected by an experiment with the management game SINTO-Market. This management game puts the players in a competitive situation in the branded food product sector, within which the subjects take over the role of the managers who have to find out the most successful strategy. From experimental research with this management game we will draw some interesting conclusions about human behavior in complex economic decision-making situations. To investigate educational effects the management game SINTO-Market was performed with students of different educational levels 17 times. The results show some significant differences between graduates and undergraduates.     

高校教师教学质量评议机制的委托-代理模型分析

高校教学评议体制是高等教育质量保障体系的重要组成部分,但是实践中仍存在一些问题:过分强调科学管理主义而忽视了教师的精神激励;可能出现学生评价不准确和不负责任,学生与教师之间形成合谋等现象导致监督和考评作用失效;教学质量评价指标的科学化、教学评议的反馈途径等.通过建立高校教学质量评议的委托代理模型,同时考虑到高校教师的工资待遇等物质激励,以及职业道德和自我价值实现等精神激励两种因素,剖析了无私奉献和机会主义两种教学行为的混同均衡和分离均衡条件;最后,提出改进和完善高校教学质量评估的建议.     

A local instructional theory for the guided reinvention of the quotient group concept

In this paper we describe a local instructional theory for supporting the guided reinvention of the quotient group concept. This local instructional theory takes the form of a sequence of key steps in the process of reinventing the quotient group concept. We describe these steps and frame them in terms of the theory of Realistic Mathematics Education. Each step of the local instructional theory is illustrated using example instructional tasks and either samples of students’ written work or excerpts of discussions.     

Spin-Crossover Assisted Spin-Switching and Rectification Action in Half-Metallic Graphitic Carbon Nitride(g-C4N3)

Herein, we report on the potential multifunctional spintronic action of half-metallic graphitic carbon nitride (g-C₄N₃). We observed electrostatic spin-crossover action at an applied electric field of −0.77 V nm⁻¹, which eventually leads to spin-switching action and change in sign of bias dependent spin injection coefficient. The system also acts as a spin polarized charge current rectifier with rectification ratio of 65.41 in spin-up channel only. This electric field-controlled spin switching action and simultaneous existence of rectification action makes graphitic carbon nitride a perfect multifunctional spintronic system-an ideal material for quantum logic gate design. Results obtained have been substantiated through transmission spectra and transmission pathways analyses. An analysis of projected device density of states of the system and molecular projected self consistent Hamiltonian states analysis reveals that the electron flow of the system is mainly facilitated by 2p orbitals of C and N atoms.     

教材中化学实验的变化对实验教学的启示——以人教版《化学1》为例

以人教版《化学1》为例,对比几个版本中化学实验内容的变化,分析变化的原因,得到几点对化学教学实验研究和实验教学的启示。     

Using similarity measures for collaborating groups formation: A model for distance learning environments

Adaptability to each separate user’s needs and preferences is a common concern in modern e-learning systems. Among various adaptation techniques described in recent research, collaboration support seeks to create groups that efficiently work together in order to advance user’s learning. This paper defines two similarity coefficients between users and learning objects and focuses on automatic creation of properly matching collaborating groups based on an algorithmic approach. By adopting methods derived from Group Technology, the method simultaneously selects appropriate learning objects to form a corresponding educational package for each group, thus assuring optimal value of user’s learning.     

The beliefs of ‘Tomorrow's Teachers’ about mathematics: precipitating change in beliefs as a result of participation in an Initial Teacher Education programme

Mathematics education research has given increasing attention to the role of affective factors in the learning process. While 'affect' is used to refer to a variety of aspects including feelings, emotions, beliefs, attitudes and conceptions, this paper focuses on 'beliefs' of elementary pre-service teachers. In particular, the study evaluates the effect of participation in a reform-based elementary pre-service teacher education (referred to as Initial Teacher Education (ITE)) programme on participants' 'beliefs about the nature of mathematics'. This was completed using two (sub)scales of the Aiken's Revised Mathematics Scale measuring Enjoyment of Mathematics (E) and belief in the Value of Mathematics (V). Both scales were administered before and after participants completed the mathematics education programme, which consisted of 5 compulsory and consecutive modules. This study reveals that entry-level pre-service teachers report generally positive beliefs about the value of and enjoyment in doing mathematics. The findings challenge previous research, which report the tendency of teachers' beliefs to be resistant to change while in teacher education and suggest that it is possible for ITE mathematics education programmes to stimulate improvement in beliefs and attitudes among participants. Particular programme features are identified as instrumental in this positive change in beliefs about mathematics.     

Ab initio Study on Structures and Isomerization of Magnesium Fluorosilylenoid H2SiFMgF

采用从头算分子轨道理论对镁氟类硅烯H2SiFMgF的构型及异构化进行了研究. 在B3LYP/6-31G(d,p)和G3MP2B3水平上找出四种构型及三种过渡态,并进行了全优化. 在B3LYP/6-31G(d,p)的优化参数基础上,得到了各构型的振动频率,计算了e29Si的化学位移.在B3LYP/6-31G(d,p)水平上,以四氢呋喃为溶剂,采用可极化连续模型研究了溶剂化效应. 并采用内察反应坐标方法对过渡态进行了验证. 研究结果表明,四面体结构具有最低的能量,最稳定. 四面体、三元环和p-络合物结构为实验可探测结构,σ-络合物结构具有最高能量,也是不能存在的构型     

美国微积分教学改革的一些动向

本文介绍美国大专院校微积分教学改革的一些新动向,重点是利用计算机这一当代科技成果对传统微积分教学进行改革的情况。