Quantitative evaluation of air pollution in transport strategic environmental assessment: a case study based on uncertainty analysis and graphic information system technology   总被引：1，自引：0，他引：1  

Hong-tao Bai  Hui-zhi Wang  He Xu  Tan Zhu 《浙江大学学报(A卷英文版)》2010,11(5):370-381

Although the impact of road transport on urban air quality has achieved a high profile in China, still greater attention is required as it has not yet been considered fully even in relation to the road network linking cities and urban areas. Strategic environmental assessment （SEA） is a systematic and comprehensive process for evaluating the environmental impacts of a policy, plan or program in publicly accountable decision-making. Air pollution has been recognized as a significant issue in most transport SEA practices. The Strategic Environmental Assessment of the Hubei Road Network Plan （2002-2020） （HRNP） was introduced as one of the World Bank＇s pilot SEA projects. An effective framework was developed to investigate the functional relationship between the road network and its potential air pollutant emissions. In this study, two indicators were identified： emission intensity/ inventory of pollutants and the spatial distribution of the most polluted areas. Because strategic actions are inherently nebulous and data quality is often disappointing, three alternative scenarios were employed to address uncertainties and data/scale issues. Calculations were made using emission models and results were analyzed with the help of statistical tools and the geographic information system （GIS）. The results from the project implementation and the feedback from the World Bank have both shown that the proposed framework is effective in the transport SEA process.  相似文献   

Driving force and structural strength evaluation of a flexible mechanical system with a hydrostatic skeleton     

Daisuke MARUYAMA  Hitoshi KIMURA  Michihiko KOSEKI  Norio INOU 《浙江大学学报(A卷英文版)》2010,11(4):255-262

The purpose of this study was to build a flexible mechanical system with a hydrostatic skeleton. The main components of this system are two type flexible bags. One is a structural bag with constant inner pressure. The other is an actuator bag with controlled inner pressure. To design the system, it was necessary to estimate both structural deformation and driving force. Nu- merical analysis of flexible bags, however, is difficult because of large nonlinear deformation. This study analyzed structural strength and driving force of flexible bags with the nonlinear finite element analysis （FEA） software ABAQUS. The stress con- centration dependency on the bag shape is described and the driving force is calculated to include the large deformation. From the analytical results, this study derives an empirical equation of driving force. The validity of the equation was confirmed by condition-changed analyses and experimental results.  相似文献   

Temporal variation in modal properties of a base-isolated building during an earthquake     

Izuru TAKEWAKI  Mitsuru NAKAMURA 《浙江大学学报(A卷英文版)》2010,11(1):1-8

Temporal variation of dynamical modal properties of a base-isolated building is investigated using earthquake records in the building. A batch processing least-squares estimation method is applied to segment-wise time-series data. To construct an input-output system, an auto-regressive model with exogenous input （ARX） of second-order including a forgetting coefficient as a weighting coefficient is used for the estimation of modal parameters. The fundamental and second natural frequencies and the damping ratios of the fundamental and second natural modes of the base-isolated building are identified in the time domain. The identified results are consistent with the results obtained from the micro-tremor vibration data, forced-vibration test data and earthquake records in the present base-isolated building in the case of taking into account the amplitude-dependency of the iso- lators and viscous dampers. It is finally pointed out that several factors, e.g., amplitude dependency of the isolator and damper system and special characteristics of the series-type viscous damper system, may be related complicatedly with the temporal variation in modal properties of the above-mentioned system.  相似文献   

Simulation of top-down crack propagation in asphalt pavements     

Hui Luo  Hong-ping Zhu  Yu Miao  Chuan-yao Chen 《浙江大学学报(A卷英文版)》2010,11(3):223-230

Top-down crack in asphalt pavements has been reported as a widespread mode of failure.A solid understanding of the mechanisms of crack growth is essential to predict pavement performance in the context of thickness design,as well as in the design and optimization of mixtures.Using the coupled element free Galerkin (EFG) and finite element (FE) method,top-down crack propagation in asphalt pavements is numerically simulated on the basis of fracture mechanics.A parametric study is conducted to isolate the effects of overlay thickness and stiffness,base thickness and stiffness on top-down crack propagation in asphalt pavements.The results show that longitudinal wheel loads are disadvantageous to top-down crack because it increases the compound stress intensity factor (SIF) at the tip of top-down crack and shortens the crack path,and thus the fatigue life descends.The SIF experiences a process "sharply ascending—slowly descending—slowly ascending—sharply ascending again" with the crack propagating.The thicker the overlay or the base,the lower the SIF; the greater the overlay stiffness,the higher the SIF.The crack path is hardly affected by stiffness of the overlay and base.  相似文献   

部分线性模型的光滑样条推断     

卢一强  陈中威 《雁北师范学院学报》2010,(1)

运用光滑样条估计部分线性模型中的非参数函数,利用限制最大似然或广义交叉验证(GCV)的方法选择光滑参数,主要考察了部分线性模型的光滑样条估计以及有关非参数函数部分的假设检验.基于光滑参数的选择方法,提出了部分线性模型中的非参数函数是否为多项式函数的假设检验方法,并通过模拟例子研究本文提出的推断效果.  相似文献   

连词“缘”的语法化及相关问题考察     

李为政 《新乡师范高等专科学校学报》2010,24(1)

"缘"是中古时期新兴的一个表因连词,它的语法化经历了一个由表"凭借、依据"义的动词到工具介词再到表因连词的过程。这个语法化之所以能够完成,内部因素和外部因素的共同作用是一个不可或缺的重要条件。而且这种演变完全是在汉语内部完成的,与语言接触无关。  相似文献   

基于ANSYS的高速包装机的椭圆齿轮模态分析   总被引：1，自引：1，他引：0  

黄志东  韩杨 《辽宁科技学院学报》2010,12(3):29-30,46

采用有限元法,建立了椭圆齿轮的动力学模型,通过有限元分析软件ANSYS对椭圆齿轮进行模态分析,得到了椭圆齿轮的前六阶固有频率和对应振型。该方法和所得结果为动态设计提供了参考,同时也为椭圆齿轮系统的动态响应计算和分析奠定了基础。  相似文献   

浅谈GPS在城市地籍测量中的应用     

崔海燕  张伟 《辽宁科技学院学报》2010,12(4):26-27

本文通过工程实例,从工程的前期资料准备和技术设计,到实地选点埋石、外业观测、数据处理分析、质量控制及成果验证等详细阐述了利用GPS进行地籍控制测量的优越性。  相似文献   

加强党的建设促进新建本科高校内涵式发展——以辽宁科技学院四年发展为例     

温景文 《辽宁科技学院学报》2010,12(4):1-4

以改革创新精神加强和改进高校党建工作是高校改革发展的重要政治任务和时代课题。新建本科院校面临着自身发展建设中的特殊性问题及外延发展与提升内涵并重的多重压力,因此,学校的党建工作也面临着重要、艰巨而紧迫的任务。文章以辽宁科技学院为例,就如何以党建促进学校内涵式发展,推进学校教育教学改革紧跟经济社会和高等教育飞速发展和快速变化的形势要求,探索并提出了通过开拓创新党建工作解决新建本科院校生存发展问题的有效途径。  相似文献   

基于偏离-份额分析法的南通工业结构研究     

杨伟  高菊生 《南通职业大学学报》2010,24(4):1-5

运用偏离-份额分析法,以1998-2008年为考察期,以江苏省为参照系,对所选取27个主要工业行业的运行指标进行数量和图形分析。结果显示,当前南通工业经济快速发展,竞争力强,但结构不甚合理。为此,必须加快主导产业选择,做强传统支柱产业,努力发展临海工业,壮大特色支柱产业,精心培育新兴产业。  相似文献