新工科背景下湖南大学应用化学专业教学改革研究与实践

新工科背景下我国高校强调宽口径、跨学科和复合型的应用化学学科人才培养。结合我校近年来应用化学专业教学改革研究的实际情况,从专业综合改革、实践教学、创新创业及海外课程等几个方面,总结了应用化学专业本科教学的改革成果。     

Understanding secondary–tertiary transition in mathematics

In Clark and Lovric (Suggestion for a theoretical model for secondary–tertiary transition in mathematics, Math. Educ. Res. J. 20(2) (2008), pp. 25–37) we began developing a model for the secondary–tertiary transition in mathematics, based on the anthropological notion of a rite of passage. We articulated several reasons why we believe that the educational transition from school to university mathematics should be viewed (and is) a rite of passage, and then examined certain aspects of the process of transition. Present article is a continuation of our study, resulting in an enhanced version of the model. In order to properly address all aspects of transition (such as a number of cognitive and pedagogical issues) we enrich our model with the notions of cognitive conflict (conceptual change) and culture shock (although defined and used in contexts that differ from the transition context, nevertheless, we found these notions highly relevant). After providing further justification for the application of our model to transition in mathematics, we discuss its many implications in detail. By critically examining current practices, we enhance our understanding of the many issues involved in the transition. The core section ‘Messages and implications of the model’ is divided into subsections that were determined by the model (role of community, discontinuity of the transition process, shock of the new, role of time in transition, universality of transition, expectations and responsibilities, transition as a real event). Before making final conclusions, we examine certain aspects of remedial efforts.     

Exercising flexible load contracts: Two simple strategies

A flexible load contract is a type of swing option where the holder has the right to receive a given quantity of electricity within a specified period, at a fixed maximum effect (delivery rate). The contract is flexible, in the sense that delivery (the take hours) is called one day in advance. We investigate two simple strategies for exercising flexible load contracts, where both use price information from the forward market. For 10 contracts traded in the period 1997–2001, we calculate the performance of the two strategies and compare with the reported performance of one complex dynamic programming approach as well as the actual results obtained by three anonymous market participants. The comparison indicates that our simple computer‐efficient strategies perform better on average and produce more stable results. Copyright © 2007 John Wiley & Sons, Ltd.     

静息血压控制正常的运动高血压患者临床特征分析及动脉弹性的比较

目的分析静息血压控制正常的运动高血压患者临床特征及动脉弹性.方法原发性高血压患者101例,根据运动血压结果分为运动高血压组(运动收缩压峰值≥200mmHg,48例)和运动血压正常组(运动收缩压峰值<200 mmHg,53例),用心-踝血管指数(CAVI)作为反映大动脉硬度的指标.结果与运动中血压反应正常组相比,出现运动高血压患者中,老年人、吸烟、肥胖、高HbA1C、高LDL-C、合并脑卒中的比例显著增多,服用他汀类药物比例减少(P<0.05).运动高血压组亚极量运动收缩压、收缩压增量、血压升高速率较运动血压正常组明显偏高,分别为(213.73±5.8)、(177.9±8.4)mmHg,(71.5±6.6)、(44.7±7.6)mmHg,(8.6±1.9)、(4.9±1.0)mmHg/min(均P<0.05);运动高血压组患者CAVI显著大于运动血压正常组,分别为(10.61±0.78)、(9.03±0.91)m/s (P<0.05).亚极量运动收缩压与CAVI、BMI、HbA1c、是否服用他汀类药物相关(P<0.05或0.01).结论即使静息血压控制正常,出现运动高血压的患者中,心血管危险因素比例显著增多,动脉僵硬度增高.运动血压与动脉弹性、BMI、是否服用他汀类药物、HbA1C密切相关.     

由欧美MOOCs风暴,探析中国大学物理精品资源共享课程的建设与发展

十一五国家精品课程正在被转型升级为精品资源共享课,此项工作是国家中长远教育计划中质量工程的一部分,旨在推动高等学校优质课程教学资源通过现代信息技术手段共建共享,提高人才培养质量,服务学习型社会建设,推动原有精品课程优质资源实用化、简洁化和共享化.本文从欧美兴起的MOOCs风暴,结合东南大学大学物理精品课程的首批成功申报,介绍大学物理精品课程持续建设的成果,并在此基础上探讨、展望精品资源共享课的建设发展之路和前景.     

因子分析法在简易评价教师课程教学效果中的应用

介绍一种简易评价教师课程教学效果的实用方法,应用因子分析法,从学生成绩数据中提取出有关课程教学效果的信息.该方法具有采用指标少、数据可靠易得、操作简单的特点.     

Pricing of perpetual American and Bermudan options by binomial tree method

In this paper, we consider the binomial tree method for pricing perpetual American and perpetual Bermudan options. The closed form solutions of these discrete models are solved. Explicit formulas for the optimal exercise boundary of the perpetual American option is obtained. A nonlinear equation that is satisfied by the optimal exercise boundaries of the perpetual Bermudan option is found.      

代数系列课程习题讨论课的改革与实践

通过作者多年教学实践和总结 ,提出代数习题讨论课对培养学生分析解决问题的能力 ,初步的研究创新意识和提高代数课的教学质量是一个很有益的教学环节 .     

Analytic solution for American barrier options with two barriers

This paper concerns American barrier options with two barriers. Standard American Options are difficult to price but there exist good numerical or analytical approximation methods. The situation is different for American barrier options. These options cease to exist or come into being if some price barrier is hit during the option's life. The paper studies analytic valuation of American barrier options with two barriers where the barriers become active by turns. In this paper, analytic valuation formulas for these options are derived by using both constant and exponential barriers for optimal early exercise policies.     

有机化学在线课程建设*——基于“激越四段式”全在线教学模式

基于“激越四段式”全在线教学模式,以超星泛雅网络学习平台为课程建设平台,开展有机化学在线课程建设。每个单元由思维导图、引导案例、单元知识点、小组任务、知识拓展、单元作业等6个部分组成,各微知识点配备电子教材、微课视频、教学内容与讨论、知识点测验等4个板块。该在线课程可以满足学生多样化、层次化的个体和团队的自学需求,着重训练学生自主学习和探究性学习的能力。