基于中部地区崛起战略的河南省地域空间组织研究

河南省在中部地区崛起战略中占据重要的战略区位,不仅要注重自身发展,还应积极争取与邻近省份市县地域的有效对接,合力并举助推中部地区崛起战略的顺利实施。首先采用分形理论以及空间分析方法研究了河南省的地域结构特征,发现城市分布格局以郑州市为中心进行自组织演化,市县分布多沿交通干线,"轴带+圈层"的复合型地域结构显现;然后采用统计分类、城市规模分级方法,分析了河南省的经济、城镇以及交通发展现状,发现经济发展区域差异显著,城镇规模序列结构不完善,陆路综合交通网络发达;最后基于河南在中部地区崛起中的战略地位,提出了改善河南地域结构的结点优化、轴带组织和面域扩展相结合的系统化空间组织路径。     

首件封样作业法

文章提出了一种新的作业管理方法。此方法以首件加工的产品作为封样,确定批次产品的实物检验标准,以此规范操作者、质检员、工艺技术员、设备维修工、生产管理人员等生产过程诸影响因素的行为,以促进产品质量和工作质量的整体提升。     

火力发电厂6kV输煤皮带电机轴承烧损探讨

火力发电厂常遇到电机轴承烧损的问题,常见的6kV的高压输煤电机轴承损坏,会影响到机组的安全运行,让火力发电厂蒙受较大损失。文章主要对一个2×600MW超临界机组电厂6 kV输煤皮带电机轴承烧损问题进行分析,并提出了处理及预防方案,可供同类电厂借鉴。     

Production Efficiency of Jasmine Rice Producers in Northern and North‐eastern Thailand

The paper jointly evaluates the determinants of switching to Jasmine rice and its productivity while allowing for production inefficiency at the level of individual producers. Model diagnostics reveal that serious selection bias exists, justifying use of a sample selection framework in stochastic frontier models. Results from the probit variety selection equation reveal that gross return (mainly powered by significantly higher Jasmine rice price), access to irrigation and education are the important determinants of choosing Jasmine rice. Results from the stochastic production frontier reveal that land, irrigation and fertilisers are the significant determinants of Jasmine rice productivity. Significantly lower productivity in Phitsanulok and Tung Gula Rong Hai provinces demonstrate the influence of biophysical and environmental factors on productivity performance. The mean level of technical efficiency is estimated at 0.63 suggesting that 59% [(100 ? 63)/63] of the productivity is lost due to technical inefficiency. Policy implications include measures to keep Jasmine rice price high, increase access to irrigation and fertiliser availability, as well as investment in education targeted to farm households which will synergistically increase adoption of Jasmine rice as well as farm productivity.     

基于终极产权论的股权结构与公司绩效研究

文章依据终极产权理论,对我国制造业上市公司股权进行重新划分,分为国有终极控制权和非国有终极控制权.采用面板数据方法,在控制样本选择偏差和股权内生变量的前提下研究股权结构对公司绩效的影响.实证结果表明,终极控制权比例与国有控股公司绩效CFOA、M/B呈显著的倒U性关系,而与传统绩效指标ROE、ROA无显著关系,在非国有终极控股公司中则不存在上述关系.流通A股比例与公司绩效关系不确定.样本选择偏差、机构投资者和外资股对公司绩效也有不同的影响.     

Nearly exact sample size calculation for powerful non‐randomized tests for differences between binomial proportions

In the case of two independent samples, it turns out that among the procedures taken in consideration, BOSCHLOO'S technique of raising the nominal level in the standard conditional test as far as admissible performs best in terms of power against almost all alternatives. The computational burden entailed in exact sample size calculation is comparatively modest for both the uniformly most powerful unbiased randomized and the conservative non‐randomized version of the exact Fisher‐type test. Computing these values yields a pair of bounds enclosing the exact sample size required for the Boschloo test, and it seems reasonable to replace the exact value with the middle of the corresponding interval. Comparisons between these mid‐N estimates and the fully exact sample sizes lead to the conclusion that the extra computational effort required for obtaining the latter is mostly dispensable. This holds also true in the case of paired binary data (McNemar setting). In the latter, the level‐corrected score test turns out to be almost as powerful as the randomized uniformly most powerful unbiased test and should be preferred to the McNemar–Boschloo test. The mid‐N rule provides a fairly tight upper bound to the exact sample size for the score test for paired proportions.     

Modeling Methods for Discrete Choice Analysis

This paper introduces new forms, sampling and estimation approaches fordiscrete choice models. The new models include behavioral specifications oflatent class choice models, multinomial probit, hybrid logit, andnon-parametric methods. Recent contributions also include new specializedchoice based sample designs that permit greater efficiency in datacollection. Finally, the paper describes recent developments in the use ofsimulation methods for model estimation. These developments are designed toallow the applications of discrete choice models to a wider variety ofdiscrete choice problems.     

皖江城市带县域经济发展时空差异分析--基于2000～2012年实证探讨

以皖江城市带为例,从规模、质量、潜力3方面构建评价指标体系,运用熵值法测度2000~2012年皖江城市带县域经济发展综合值;并通过ESDA模型揭示皖江城市带县域经济发展时空差异特征。结果表明：2000~2012年县域经济发展综合值增幅达到32.29%,变异系数CV上升说明县域经济发展差异日趋显著;县域经济全局上呈现出空间自相关性,表现出集聚型发展模式;局部上热点区主要分布在芜湖、合肥的县（市）,而冷点区主要分布在池州、安庆的县（市）,且分异格局相对稳定。并从重组城镇空间结构、调整城市产业格局、完善区域基础设施3个方面提出皖江城市带县域经济协调发展的整合建议。     

皖江城市带文化旅游发展的路径选择

皖江城市带文化资源丰富,发展文化旅游产业是实现该地区经济绿色增长,推动经济发展方式转变的重要途径．也是加速安徽中部崛起的必然选择和内在要求。文章在阐述文化旅游内涵的基础上,深入挖掘皖江城市带文化旅游资源在历史、目然景观、宗教、文艺等方面的丰富性,并据此提出其发展路径：统筹规划、促进品牌建设、打造精品路线等。     

皖江城市带投资环境的因子分析及对策建议

在遵循科学性、系统性、代表性及可操作性原则基础上,选取经济环境、基础设施环境、市场环境、社会环境以及科技环境5个一级指标和若干二级指标,构建皖江城市带投资环境评价指标体系。并运用因子分析法,对皖江城市带各城市投资环境进行综合系统评价,依据实证结果对皖江城市带投资环境存在的问题进行比较分析。结合皖江城市带发展现状,从政策环境、基础设施建设、产业结构升级、自主创新等方面提出相关对策建议。