课堂师生互动 提高课堂效率

在当今这个知识腾飞的年代,掌握知识的多少已经不是教学的最终目标,如何学会知识这才是最重要的。新课改理念下的师生互动就是克服传统课堂中的单一枯燥的教学行为,打破课堂的沉闷,让学生在一种愉悦亢奋的状态中主动学习、积极思考。基础教育的任务不仅仅是传授知识,更重要的是让学生学会学习,培养可持续的学习动机和终身学习的愿望和能力。本文通过对师生互动的前提、师生互动的保证、师生互动的基础、师生互动的内在动力、师生互动的修养、师生互动的提问等几个方面来阐述如何落实师生互动,提高课堂效率,使师生互动的价值在数学课中真正显现出来。     

Approaches towards a generic methodology for storage of hazardous energy carriers and waste products

Energy carriers – either conventional or ‘new’ ones – have to be provided in large amounts to meet the requirements of permanent availability and reliable supply of electricity. Depending on their state of aggregation, energy carriers are either stored in large masses (if solid or liquid) or at elevated pressures (if gaseous). Both impose the hazard of large-scale fire, in the latter case additionally the danger of explosion or unintended release. Very similar hazards occur for wastes. Solid wastes are present in large masses and only a small part is recycled. Most of the solid wastes are used in energy conversion. The main gaseous waste is CO₂. During capturing also the hazard of unintended release exists. In this article, existing approaches for safe storage and fire prevention are discussed and a generic methodology is outlined. This methodology consists of the following steps:

? gaining knowledge about the behaviour of the material stored (reactivity, thermal stability, etc.),

? assessing the environmental conditions for the storage site (neighbourhood, safety distances, etc.),

? assessment of prospective consequences of an incident and

? development of individual loss prevention conceptions.

All steps require both experimental testing and theoretical considerations about accident scenarios as integral parts of the methodology.     

双齿辊破碎机齿板的修复应用

本文介绍了引进耐磨堆焊新材料,经过实验和实践克服了双齿辊破碎机齿板的堆焊难题,完成了齿板的修复,保证了破碎机出料粒度,减少了准备系统的运转时间;实现了节能降耗,取得了相当可观的经济效益和社会效益。     

Very fast money: High-frequency trading on the NASDAQ

This paper provides evidence regarding high-frequency trader (HFT) trading performance, trading costs, and effects on market efficiency using a sample of NASDAQ trades and quotes that directly identifies HFT participation. I find that HFTs engage in successful intra-day market timing, spreads are wider when HFTs provide liquidity and tighter when HFTs take liquidity, and prices incorporate information from order flow and market-wide returns more efficiently on days when HFT participation is high.     

关于五星级酒店的能源管理实施及方案

本文针对我国大酒店节能发展状况进行了有效的分析,同时提出能源管理在五星级酒店中的市场透视,从而定制能源管理在五星级酒店中的几点实施方法。     

Payment for ecosystem services through renewable energy generation to promote community-based natural resource management in the Blyde in South Africa

Loss of biodiversity is putting the South African economy and the quality of life of its citizens at risk. Payment for ecosystem services (PES) is a way to incentivise conservation, community-based natural resource management and restoration of the environment. This article discusses a proposed PES project through the generation of hydro-electricity in the Blyde River Canyon Nature reserve. It argues that this proposed project could serve as an example for other PES projects and that it would strengthen community-based natural resource management, be beneficial to environmental conservation, counteract climate change, and provide socio-economic benefits to surrounding communities.     

计算机审计中的电子数据轨迹分析

不同阶段电子数据的操作都会留下表现各异的轨迹。从操作系统、计算机应用系统、数据传输、数据采集和分析等不同层面深入分析审计电子数据轨迹在计算机系统中表现形式，可以为审计人员提供有效的审计方法。     

Voluntary Cost-Sharing for Environmental Risk Reduction: A Pollution Abatement Case Study

This paper develops the notion of voluntary cost-sharing as a paradigm for ameliorating pollution: polluters and sufferers can choose to share the costs of pollution abatement and participate together in reducing pollution. If both polluters and sufferers each care about the state of the environment but have limited resources, the issue is one of optimality: a better level of environmental quality could be achieved if polluters and sufferers in a locale share costs of abatement. An example—nitrogen pollution due to fertilizer for food—is used to demonstrate that a preferred outcome can be obtained with cost sharing among polluters and consumers as compared to a “Polluter Pays” outcome. Input taxes and ambient subsidies or taxes are also relevant policy tools with cost-sharing.     

县乡公共资源激活的公平与效率研究

本文探讨了县乡公共资源的基本特征,研究了激活这些资源的重要意义;认为当前在激活这些公共资源上存在着不公平和低效率的问题;最后,文章就公共资源激活中如何保证公平,提高激活效率,提出了参考建议。