PBTG法快速求解粗糙海面散射增强效应

针对矩量法(MOM)不能有效求解大尺度粗糙介质表面散射特性的问题,采用基于物理的双网格法(PBTG)快速计算了高斯粗糙海面的散射特性,对比了不同矩阵维数下的求解时间,研究了水平、垂直极化下粗糙海面的散射增强现象。通过与矩量法的比较,证明了PBTG法的高效性。     

海浪谱的选择对海面电磁波散射建模的影响

海浪谱的选择对Bragg共振散射建模的影响是海面电磁波散射建模的关键问题。首先简介了 海浪谱的概念,然后选择RA（Romeiser-Alpers）谱 进行了Bragg共振散射建模,最后选择另一种具有代表性的PM（Pierson-Moskowitz）谱进 行了Bragg共振散射建模,并通过仿真实验对两种海浪谱及其用于Bragg共振散射建模的效果 进行了比较分析。获得的结论对合理地选择海浪谱具有指导意义。     

碳酸钙的表面改性研究

采用硬脂酸钠对碳酸钙进行湿法表面改性研究。研究了改性剂用量、改性时间、改性温度对改性效果的影响,通过沉降速度和活化指数等表面物化性能评价了碳酸钙粉体的改性效果。实验结果表明,最佳的改性工艺条件为：改性剂用量2％（质量分数）,改性时间1h,改性温度85℃。改性后的碳酸钙粉体表面性质发生了明显的变化,沉降速度减慢,活化指数增大。     

谈外商直接投资对我国经济效应的影响

作为联系和影响国家间产业结构变动的重要纽带,外商直接投资(FDI)自80年代中期以来,速度和规模都在迅速壮大,并对投资国、东道国和世界经济的发展产生了深刻影响。文章在当前国内外研究的基础上,针对我国引进FDI的实际情况,分析引进FDI的经济效应,并对如何更好的引进FDI提出相关政策建议。     

产业发展对房地产价格的影响研究

本文基于我国大陆地区30个省(市、自治区)的面板数据,对产业发展与房地产价格之间的作用机理进行了实证研究。结果表明,从全国层面来看,第二产业、第三产业对房地产价格的推动作用都比较显著,其中第三产业比第二产业对房地产价格的推动作用更强;从东部、中部、西部和东北区域层面来看,只有东部地区的第二产业、第三产业发展对房地产价格的推动作用比较显著,其他地区的第二产业、第三产业发展对房地产价格的推动作用不明显。因此,房地产调控政策的制定要根据当地产业发展现状因城施策,并通过各产业发展来引导房地产市场的健康发展。     

The influence of hedonic versus utilitarian consumption situations on the compromise effect

This article reports the influence of two specific consumption situations—hedonic and utilitarian—on the magnitude of the compromise effect. Based on the literatures of different valuation processes (valuation by calculation vs. valuation by feeling) and hedonic versus utilitarian consumption, the authors suggest that the compromise effect will be stronger under the utilitarian (vs. hedonic) consumption situation due to different valuation processes. Three experimental studies were conducted, and the results have supported the prediction. In addition, the authors successfully excluded alternative explanations such as differences in willingness to pay, justification, and attribute importance. The authors concluded with a discussion of the theoretical and managerial implication of this research.     

Research on the influence of after-sales service quality factors on customer satisfaction

Determining customer satisfaction elements in retailing after-sales services have been well explored; however, the increasing competition in this area demands the investigation of actual instrumentality of these elements on satisfaction of customers. In the present research, we have proposed a framework for assessing the instrumentality of after-sales services on customer satisfaction. Kano model and SERVQUAL framework were used to categorize customer satisfaction elements. In addition, in order to address behavioral dissimilarities among customers, RFM clustering technique was used for analysing 243,180 customers of automobile after-sales services. Accordingly, dissatisfaction decrement index and satisfaction increment index were measured for every cluster separately. We identified a group of 21 quality elements and demonstrated the instrumentality and quality of these quality elements on customer satisfaction. RFM clustering technique is applied to address customer dissimilarities and we demonstrated the preferences and desires of customers in each cluster. While some papers have already identified the influential factors of after-sales services on customer satisfaction, this is for the first time that the instrumentality of after-sales services is being identified. Accordingly, this study demonstrates how different after-sales services quality elements affect customer satisfaction. Therefore, the results of this study can help companies to allocate their resources more efficiently.     

聚合氯化铝的聚合物种类影响混凝效果的研究

聚合氯化铝是目前最广泛使用的高效混凝剂,它具有用量少、污泥少、除浊高,对出水pH影响小等优点。聚合氯化铝是一系列介于Al^3＋和氢氧化铝之问聚合物的复合体,对于何种物种能起到决定性的混凝效果,目前尚没有公认的结论。通过对不同生产工艺得到的商品聚合氯化铝进行聚合物种类的研究,并结合混凝实验,发现高分子聚合氯化铝对混凝效果发挥了更大的作用。     

中美博弈对全球价值链的影响机理与重构效应

当前,虽然中美经贸摩擦暂时得到缓和,但中美博弈冲突并未在根本上得到解决,其对全球价值链的影响具有长期性。从出口层面看,贸易政策不确定性加剧,直接影响着企业的生产布局和出口选择,进而引发贸易转移效应;从进口层面看,两国间的关税措施抬高了进口成本,必将引发进口国企业和消费者的替代效应。未来国际经贸秩序的深度调整、大国间冲突与博弈的不断演化、国家间经贸关系不确定性加剧等因素,将进一步加速全球价值链的重构进程。具体表现为:全球生产链条缩短,区域性经贸合作加强;研发创新本土化、产业回流等因素将提升国家价值链的战略地位;全球价值链竞争的核心围绕高技术产业展开,中美博弈将表现为中美两种发展模式的对抗。