Particulate pollution in an underground car park in Wuhan,China

Particulate matter（PM） pollution in an underground car park in Wuhan was investigated.Mass concentrations of PM₁₀ and PM_2.5 were obtained using gravimetric method.Selected metal elements,such as Fe,Mn,Zn,Pb,and Cu in PM₁₀ samples,were determined using atomic absorption spectrometer（AAS）. Beta attenuation method was applied to observe the hourly variation of PM₁₀ levels.Results show that average PM₁₀ concentrations at the entrance and at the exit were 101.3μg/m³ and 234.4μg/m³,respectively, and average PM_2.5 concentrations at the entrance and at the exit were 47.7μg/m³ and 62.7μg/m³, respectively.PM pollution was worse at the exit than at the entrance.Hourly PM₁₀ concentration was weakly correlated with traffic flow.Regarding element concentrations,the most enriched element in PM₁₀ samples was Fe.Re-suspension of soil dust at the exit is an important source of PM₁₀.     

区域高技术产业技术创新效率测度与提升路径研究——基于共享投入关联型两阶段DEA模型

将高技术产业创新过程划分为技术研发和经济转化两个阶段,考虑初始创新投入在两阶段分配、非研发投入及新产品开发费用等因素对创新产出的影响,构建共享投入关联型两阶段DEA模型,并测度了2013~2015创新年度中国大陆30个省份的高技术产业技术创新整体效率与两阶段效率。结果表明:大多数区域高技术产业初始创新投入对研发产出和经济产出均有影响;高技术产业技术创新整体效率与两阶段效率都较低,且各区域创新效率水平差异较大;技术研发效率水平高于整体效率水平,而经济转化效率水平低于整体效率水平。最后,依据高技术产业技术创新两阶段效率及其在整体效率中的权重对各区域进行重分类,有针对性地提出了单边突破式、双向协调式等多条技术创新效率提升路径。     

合同能源管理中超额节能收益分配问题研究

在我国合同能源管理项目中,节能收益分享模式被广泛采用。通过构建“委托-代理”模型深入分析节能收益分享模式下的超额节能收益分配问题。研究发现:(1)无论是否出现超额节能收益,合同中用能方的节能收益分享比例不得超过50%;(2)在引入节能服务公司的努力成本系数且不考虑节能改造双方风险偏好的情况下(风险中性),当努力成本系数在特定的取值范围内,优化后的超额节能收益分配方式对节能服务公司更具激励作用;(3)考虑节能服务公司为风险规避时,其最优期望节能收益不但受其努力成本系数的影响,还受其风险规避程度以及节能收益期望方差的影响。     

影响气球车行驶效率及相关因素研究

对以气球喷气为动力的小车运动状态进行研究,从气球内部的压强入手,综合考虑摩擦力,对气球车的效率进行定义和研究,探究了小车效率的影响因素,并结合实验进行了合理的理论修正,确定了最大效率的范围.     

A hybrid metaheuristic algorithm for dynamic rail car fleet sizing problem

The aim of this paper is to present a model and a solution method for rail freight car fleet sizing problem. The mathematical model is dynamic and multi-periodic and car demands and travel times are assumed deterministic, and the proposed solution method is hybridization of genetic algorithms and simulated annealing algorithms. Experimental analysis is conducted using several test problems. The results of the proposed algorithm and CPLEX software are compared. The results show high efficiency and effectiveness of the proposed algorithm. The solution method is applied to solve fleet sizing problem in the Iran Railways as a case study.     

Normal families of meromorphic functions sharing a holomorphic function and the converse of the Bloch principle

In this paper, we investigate normal families of meromorphic functions, prove some theorems of normal families sharing a holomorphic function, and give a counterexample to the converse of the Bloch principle based on the theorems.     

基于QFD的现代轿车优势研究

利用并行工程中的使能工具--质量功能配置（QFD）,应用优势设计的理论对现代轿车质量进行研究,从而提高轿车在市场上的竞争力.此外,为了计算方便和分析结果清晰,用Visual Basic 6.0在windows98平台下开发了QFD分析软件,为以后企业利用优势设计理论采用QFD提高轿车产品质量,提供了可借鉴的经验.     

亚纯函数及其微分多项式的唯一性

研究了具有两个或三个公共小函数的亚纯函数及其微分多项式的唯一性问题,推广了邱氵金弟等人的有关结果.例子表明了定理所给的条件是必要的.