加强实验教学,培养学生实验技能和综合素质

为了提高学生的动手能力,启迪学生严谨科学的思维方法,培养学生的创新意识和实践能力,我们在植物生理生化实验教学中进行了努力的探索。通过加强实验教学,学生具备了更强的科学研究的实验技能,学生的综合素质也有较大的提高,教学效果得到社会、学校和学生的认同,较好地完成了实验教学的主要任务。     

A field experiment to explore the effects of detection and penalties communications and framing among Washington State retail firms

The Washington Department of Revenue facilitated a field experiment to explore opportunities to increase Use Tax and Business and Occupation (B&O) Tax compliance by retail industry firms. The experiment tested two enforcement strategies (actually put in place by the State of Washington): communication of noncompliance penalties and announcement of an enhanced detection initiative. Of special interest was whether the compliance initiatives would differentially influence firms in divergent financial positions (increasing versus decreasing revenues). Findings were consistent with the gain/loss framing concept of prospect theory: the elevated enforcement initiatives increased both actual reported Washington State Use taxes and B&O Taxes more for firms with declining revenues (loss frame) than for firms with raising revenues (gain frame). Historically the Use Tax has had a low rate of compliance while the B&O Tax has had a high rate of compliance; thus we tested two very different taxes. The results of the experiment suggest that revenue agencies with limited resources may benefit from focusing greater compliance enhancement efforts on firms with declining revenues as more tax dollars will be generated from these taxpayers. For tax researchers, this experiment demonstrates that gain/loss tax framing can occur in nature by means other than withholding.     

Efficient local IV estimation of an empirical auction model

In this paper we examine semiparametric efficiency bounds and efficient estimators for the case of a linear local instrument variable (LIV) model under the assumptions studied in Abadie et al. (2002). We apply the semiparametrically efficient estimation method to analyze the relation between bid dispersion and early bidding in an online auction dataset, which is collected from a natural experiment conducted in Nekipelov (2007). The results confirm the theoretical findings developed in Nekipelov (2007). The semiparametric efficient estimation procedure substantially improves the statistical significance of the effect of jump bidding on bid dispersion.     

尼龙阀芯单向阀替代不锈钢锥阀芯单向阀可行性分析

本文从市场应用、成本、可靠性等多方面分析了尼龙阀芯PA66单向阀替代不锈钢锥单向阀的可能性,通过和市场上常见的几种阀芯在不同冷媒中的浸泡试验以及长期运行试验等得出结论,尼龙阀芯单向阀在在R410a新冷媒中性能稳定,存在较大成本优势,可以替代加工工艺复杂且成本较高的不锈钢锥单向阀。     

Barter Trading as a Microeconomics Teaching Device

Karpoff reports on a “barter trading game” in which students exchanged real goods over a period of seven weeks with different market constraints imposed each week. Student comments about the exercise were favorable.     

A classroom experiment in monetary policy

The authors propose a classroom experiment implementing a simple version of a New Keynesian model suitable for courses in intermediate macroeconomics and money and banking. Students play as either the central bank or members of the private sector. The central banker sets interest rates to meet twin objectives for inflation and the output gap or to meet only an inflation target. In both settings, private sector agents are concerned with correctly forecasting the inflation rate. The authors show that an experiment implementing this setup is feasible and yields results that enhance understanding of the New Keynesian model of monetary policy. They propose alternative versions where the central bank is replaced by a policy rule and provide suggestions for discussing the experimental results with students.