低成本初中物理演示实验的开发

分析了初中物理课程标准对物理实验的要求,阐述了低成本做初中物理实验的方法,介绍了几个演示实验器材的制作过程,论述了低成本做初中物理实验的价值与意义．     

高师化学专业应加强学生实验能力的培养

作为一名行将走上讲台的高师化学专业毕业生,理应具有扎实的基础知识和娴熟的实验技能,而实际上高师化学专业应届毕业生的实验能力,令人担忧。学校要采取果断措施,提高在校生学生的实验能力,以便能胜任中学化学教学工作。     

Sampling designs for landsat crop surveys

The problem of designing large scale crop surveys which utilize Landsat data is addressed in this paper. Emphasis is on stratification and sampling approaches designed to achieve preselected precisions while permitting manageable data processing and survey costs. A dynamic area sampling frame which is versatile and highly suited for sampling of Landsat data is discussed along with the use of rotation sampling for incorporating multiple years of information into the area estimation     

Finite sample properties of maximum likelihood and quasi-maximum likelihood estimators of egarch models

In this paper I examine finite sample properties of the maximum likelihood and quasi-maximum likelihood estimators of EGARCH(1,1) processes using Monte Carlo methods. I use response surface methodology to summarize the results of a wide array of experiments which suggest that the maximum likelihood estimator has reasonable finite sample properties. The Gaussian quasi-maximum likelihood estimator has poor finite sample properties when the data generating process has conditional excess kurtosis. Some of these poor properties appear to be asymptotic in nature.     

日本农协制度的经验与启示

农协制度是日本在实现农业现代化过程中,根据本国国情独创的一套别具特色的农村合作经济组织体系,它是日本快速实现农业现代化的强有力推动因素。我国目前"三农"领域的问题越来越多,矛盾日益突出,有些问题已是久治不愈的"顽疾",成为制约我国农业现代化发展进程的"瓶颈"。而导致这种状况的根本原因就在于我国农村合作经济组织发育严重滞后,无法适应农村市场经济发展的需要。我国应该充分借鉴日本农协制度的成功经验,大力发展农村合作经济组织,加快农业现代化进程。     

有机化学实验教学的研究与实践

该文介绍了有机化学实验课的教学经验与改革体会。文章认为,上好有机化学实验课首先要从掌握化学反应原理和实验操作原理着手,启发学生积极思考,调动其学习主动性,其次应改革考核方式,推广设计型实验考核方法,使学生的实验综合能力得到进一步提高。     

对"汉字屋论证"逻辑结构的五种诊断模式

美国哲学家J.R.塞尔(Searle)于1980年提出的"汉字屋论证"(Chinese Room Argument,以下简称为CRA)目前早已成为人工智能哲学的经典话题之一。二十七年以来,反驳CRA的学者往往致力于揭露CRA本身的形而上学前设的错误,却不太去检讨CRA本身的逻辑形式。而美国学者郝泽(Hauser)与英国学者丹普尔(Damper)虽然就CRA的逻辑形式提出了总计四种诊断模式,却都没有正确地揭示出CRA的真正错误。本文将在他们的基础上提出对于CRA逻辑结构的第五种诊断模式,并由此论证:CRA之所以失败,乃是因为塞尔并未根据该论证的内在要求而在"汉字屋系统"与"计算机系统"之间建立起一种恰当的同构关系来。     

关于计算机辅助实验的几点认识

本文论述了计算机辅助实验的理论依据和特点,提出了根据不同课程的性质开展计算机辅助实验的具体方法,并总结了在实际应用中的几个具体问题。     

复合磨削钢结硬质合金的试验研究

本文提出采用电火花机械复合磨削加工钢结硬质合金的方法,通过实验研究表明,电火花机械复合磨削是加工淬硬钢结硬质合金的一种有效方法.     

Reputations in mixed-role markets: A theory and an experimental test

The traditional understanding of reputation systems is that they secure trust between strangers by publicly calling out cheaters. In modern, online markets, it is increasingly common for providers of a good to also act as consumers, and vice versa. We argue that in such mixed-role markets, reputation systems serve a second important function: They allow providers who lend out their possessions (such as their house, car or tools) to earn reputational credits that can be spent on future borrowing, especially when lending lacks monetary compensation. In an experiment that introduces a new game, “the Lending Game”, we show that, consistent with our argument, information on past lending leads subjects to lend to those who have themselves lent before, increasing overall lending. However, when lending is financially compensated, this mechanism of reciprocal lending ceases to operate.