Si衬底上ZnO外延膜结构性质的比较

采用连通式双反应室高温MOCVD系统在Si衬底上外延ZnO薄膜,通过卢瑟福背散射/沟道(RBS/C)及高分辨X射线衍射(HR-XRD)技术对不同衬底条件的ZnO外延膜进行了组分及结构分析,结果表明在采用SiC缓冲层后,Si(111)衬底上ZnO(0002)面衍射峰半高宽明显减小,缺陷密度降低,单晶质量显著变好,c轴方向应变由0.49%变为-0.16%,即由拉应变变为压应变且应变值变小,说明SiC缓冲层可以有效地减小ZnO与Si衬底晶格失配带来的应变,改善外延膜质量,实现Si衬底上单晶ZnO的生长.     

空间数据尺度的概念与逻辑小议

运用空间数据尺度有时会遇到麻烦的概念和逻辑问题,必须仔细严格划定数据的名义尺度、有序尺度、间隔尺度和比率尺度,才会避免自我矛盾。     

战略人力资源管理学说

对“战略人力资源管理”这一人力资源管理领域新内容的基本范畴进行简要的阐述，并阐述了其发展背景和理论与实践价值，进而对战略人力资源管理竞争环境的定位、组织发展阶段定位、人力资源管理特征、组织变革战略、人力资源人员与工作角色方面的主要学说进行了介绍。     

当代大学生择业观的特点与成因——一项基于文献的研究

以24篇公开发表的有关大学生择业观的调查与研究报告为样本，通过不同地域、不同学校、不同专业大学生对择业影响因素重要性的排序和选择职业、单位、就业地域的态度分析大学生的择业观。研究表明，追求物质利益、关注自我发展是当代大学生择业观的重要特点，而这种择业观的成因与大学招生就业制度的改革、现代社会整体的价值取向密切相关。     

“强化谎者”悖论的简明消解——批判塔斯基、哥德尔、爱因斯坦的相关“论点”

讨论了“仅是矛盾”和“矛盾被证”、辩证“鹰”派的反驳和逻辑派的回应、几个悖论的消解等，评述了维特根斯坦和哈克的“自涉”、克林的“悲观”情怀，批评了爱因斯坦的“轻率概括”，突显出谬误学、批判性思维的重要性。     

Unit Root Hypothesis in the Presence of Stochastic Volatility, a Bayesian Analysis

This paper investigates the impact of stochastic volatility on the Dickey–Fuller unit root test. Monte Carlo simulations show that the test size is seriously distorted if nonstationary stochastic volatility is ignored. To improve the performance of the test, we propose a Bayesian test for unit root that is robust in the presence of stationary and nonstationary stochastic volatility. The finite sample property of the proposed test statistic is evaluated using Monte Carlo studies. Applying the developed method, we test the policy effect of the Split Share Structure Reform, which is an important milestone for the development of the emerging stock market in China.     

HEDC＋＋： An Extended Histogram Estimator for Data in the Cloud

With increasing popularity of cloud-based data management, improving the performance of queries in the cloud is an urgent issue to solve. Summary of data distribution and statistical information has been commonly used in traditional databases to support query optimization, and histograms are of particular interest. Naturally, histograms could be used to support query optimization and efficient utilization of computing resources in the cloud. Histograms could provide helpful reference information for generating optimal query plans, and generate basic statistics useful for guaranteeing the load balance of query processing in the cloud. Since it is too expensive to construct an exact histogram on massive data, building an approximate histogram is a more feasible solution. This problem, however, is challenging to solve in the cloud environment because of the special data organization and processing mode in the cloud. In this paper, we present HEDC＋＋, an extended histogram estimator for data in the cloud, which provides efficient approximation approaches for both equi-width and equi-depth histograms. We design the histogram estimate workflow based on an extended MapReduce framework, and propose novel sampling mechanisms to leverage the sampling efficiency and estimate accuracy. We experimentally validate our techniques on Hadoop and the results demonstrate that HEDC＋＋ can provide promising histogram estimate for massive data in the cloud.     

Sequential entry and merger in spatial price discrimination

This paper newly introduces sequential entry into previous models of spatial price discrimination that examine location choices made in anticipation of a potential merger. While merger with simultaneous entry routinely reduces social welfare, we show that mergers frequently improve welfare. The extent of welfare improving mergers varies inversely with the timing advantage of an excluded rival. When the rival locates alone in the first stage, the merger harms welfare. When the rival locates alone in the last stage, the merger improves welfare. These results hold true when allocating three firms across either two or three location stages. Thus, allowing staged entry dramatically alters and often reverses the conclusion previously drawn on the basis of simultaneous entry.     

有机食品博览会的评估分析及对策建议

本文基于对第三届中国国际有机食品博览会——BioFach China 2009参展商和观众的调查,从展会组织、宣传、展览视觉效果和服务几个方面分析了参展商和观众对BioFach China 2009的评估情况。提出的发展对策为加大宣传力度、做好展商观众组织、重视展览视觉效果和提高服务水平。