The impact of unstructured case studies on surface learners: a study of second-year accounting students

The empirical study described here uses the R-SPQ-2F questionnaire [Biggs, J., Kember, D., & Leung, D. Y. (2001). The revised two-factor study process questionnaire: R-SPQ-2F. British Journal of Educational Psychology, 71(1), 133–149] to test deep and surface approaches to learning in a university intermediate-level accounting class that uses business cases in group presentations. Statistical testing of results for learning style before and after group presentations indicates an increase in surface learning over time, with no detectable change in deep learning style. The type of business case used has no effect, in this setting. Course grades, however, are significantly less for students who did not participate in the group presentation activity at all. The results support the claim that students focus on what is required; they may adopt a strategic approach to learning. In a similar way, accounting academics and workload models may be reacting to incentives that discourage reflective and formative feedback. If deeper approaches to learning are desirable, assessments need to reward this behaviour.     

基于欧氏Ricci流的形状分析算法

针对Ricci流强大的功能,提出了一种基于欧氏Ricci曲率流的形状分析算法,利用欧氏Ricci曲率流方法将双连通曲面映射为一个平面图像,通过测量平面图像内圆和外圆的半径,此曲面的共形模被给出,通过比较共形模的值,建立了曲面之间的形状分析算法。采用计算机模拟该算法,验证了在曲面的形状分析中有良好的性能。     

氮气与发泡剂联合防火技术在综放工作面的应用

综放工作面的煤层自燃是制约安全生产的主要因素。本文针对兴阜煤矿2312综采工作面的实际情况,提出了氮气与发泡剂联合使用的防火技术,介绍了防治自然发火的作用机理。现场实际应用表明,氮气与发泡剂联合防火技术降低了煤炭自燃发火的危险性,具有良好的预防自燃发火效果。     

暗挖法深孔预注浆加固施工技术

本文结合隧道暗挖施工,参考深孔注浆的施工案例,研究如何在保证深孔注浆施工效果的前提下,减少施工工序、加快施工进度、降低工人劳动强度,确保隧道安全顺利的施工。     

地面最高温度自动站与人工站差异分析

针对地面最高温度自动站与人工站差异问题进行原因分析发现,仪器的性能及土壤的性质是造成差异的主要原因,需要观测员在值班过程中注意连续监控,高度重视异常数据,尽量避免其他人为因素对观测数据造成影响。     

磁湖沿岸表层土壤重金属污染现状评价

为调查磁湖沿岸表层土壤重金属污染情况,对4种有代表性土壤中cu、Pb、cd、zn的有效态含量进行了分析,并采用LarsHakanson潜在生态风险指数法进行评价。结果表明：沿岸土壤总潜在生态风险程度低,不同来源的土壤土质相差较大,部分土壤受到Pb、cd、zn、cu中等污染,受湖水冲刷的地方,cu和zn具有高的潜在生态危害。     

煤矿城市的国土整治问题

煤层的地下开采造成煤矿城市的地面沉陷,应搞好以地质状况为基础的煤矿城市的国土规划。通过科学手段对已破坏的国土地貌加以整治,土地仍可得到很好利用。     

论高速公路路面基层(底基层)施工质量控制

文章结合湖南湘潭至耒阳高速公路工程实践,对高速公路路面基层(底基层)的材料要求、试验内容、施工工艺、质量控制进行了阐述。     

水泥混凝土路面产生裂缝原因分析

水泥混凝土在炎热季节下进行施工,容易使新施工的水泥混凝土路面产生裂缝,甚至发生断板。文章就水泥混凝土路面产生裂缝的各种原因进行了分析,并提出以后工作应注意的问题,以防止类似的现象再次发生。     

Testing Integration of Macroeconomic Time Series in Transitional Socialist Economies. A Modification of Perron Test

The presence of structural breaks reduces the power of integration tests. A number of methods were suggested to improve the statistical properties of integration tests in the presence of structural breaks. The most known are Perron tests, which allow to test for the level of integration of time series with one structural break. Perron tests allow for two types of structural breaks: additive outlier an innovative outlier. These tests are, however, not very useful in testing the level of integration of macroeconomic time series in countries in transition from centrally-planned to market economy. In such case one should expect two structural breaks to affect the time series: one at the beginning and one at the end of the transformation process. Test that allows for two additive outlier type structural breaks in time series is developed in this paper. This test has superior power as compared to standard Dickey-Fuller and Perron tests. This paper provides asymptotic distribution as well as finite sample properties of proposed test. Therefore practitioners receive a reliable tool for analyzing macroeconomic processes in transitional economies. This revised version was published online in July 2006 with corrections to the Cover Date.