舟曲泥石流经济损失评估(英文)

[目的]对舟曲泥石流造成的直接和间接经济损失进行评估。[方法]在 2010 年 8 月 7 日舟曲发特大泥石流发生的后第一时间收集了相关数据,建立评估模型,采用比例系数法估计潜在的经济损失。[结果]评估结果表明,此次灾害共造成经济损失 16.57 亿元人民币,其中间接经济损失高达2.42 亿,直接经济损失 14.15 亿。[结论]至目前为止,比例系数法仍是一种快速有效的评估间接经济损失的方法。     

河南省农村居民相对贫困动态演化的实证研究

基于《河南统计年鉴》中2002～2011年的农村居民纯收入分组数据和相对贫困线,应用常见的贫困指标体系,运用世界银行的POVCAL软件,实证分析了2001～2010年河南省农村居民相对贫困的动态演化过程。结果表明:河南省农村居民的相对贫困规模在持续下降;贫困的深度在不断加深;收入的差距显著扩大;相对贫困的综合程度在逐步加大。     

Analysis of Elevated Structure Radiated Noise with BEM-FEM Method

Urban rail transit is becoming an important means of transportation and elevated structure is one important part of urban rail transit. So the radiation noise induced by elevated structure attracts more and more attention. Based on the theory of Helmholtz integral equation of BEM and fluid-structure coupling system of FEM, the sound pressure transmission vector reflecting the relation between structural vibration acceleration and radiation of sound pressure is derived and solved by the element radiation superposition method. The calculated results are in good agreement with the experimental data from a viaduct section of the Beijing airport rapid rail transit.     

Structural Influencing Coefficient of Moment-Resisting Steel Frames Based on Equal Collapse Rule

In order to realize the performance target of “no collapse under rare earthquake” based on the seismic design according to structural influencing coefficient, three moment-resisting steel frames have been designed with similar probability of collapse in accordance with Chinese Seismic Code. The structural influencing coefficient of steel frames were determined through the incremental dynamic analysis method, and within equal collapse design rule. This paper proposed a method to define structural influencing coefficient can provide reference for determining the design seismic force of steel frame reasonably.     

A Modified Chloride Ion Diffusion Model in Concrete

Based on the analysis of influencing factors chloride ion diffusion in concrete and the simplified model induced by Fick's second law, a chloride ion diffusion model was established, in which , the influences of water-cement ratio, humidity, time, temperature, chloride ion binding capacity of concrete and freeze-thaw cycle are taken into consideration. The Validity of the new model is verified through the comparison of results between the proposed model and the existing analytic /numerical model. Compared with the analytic model, the proposed model can consider the seasonal change of humidity and temperature,and the time-variant effect of freeze-thaw cycle.Compared with the numerical model, the computational efficiency of the proposed model is higher.     

Airfoil design using improved particle swarm optimization

Based on the theory of standard particle swarm optimization (PSO), an improved particle swarm optimization algorithm is presented, and it has a better optimized performance than standard PSO. A multi-objective wind turbine airfoil shape optimization model is established and 4 kinds of different thick wind turbine airfoils with better performance are designed by using the improved PSO algorithm. The aerodynamic performance of the CQU-A18 and CQU-A21 airfoils are analyzed in detail compared with the commonly used wind turbine airfoil with the same thickness. The results show that the new airfoils show very good aerodynamic characteristics, and they are found to be very insensitive to leading edge roughness. The new airfoils exhibit the higher lift coefficient and larger lift/drag ratio in both smooth condition and rough condition at the main angle of attacks. The performances of the new airfoils show a significant improvement compared with the typical airfoils.     

基于材料透气性参数的食品真空冷却过程中温度分布的理论研究

分析了真空冷却过程中食品温度分布不均匀的原因。以各向同性的理想食品作为研究对象,通过引入食品材料透气性参数,将食品内部点的汽化转化为食品表面的汽化,推导出真空冷却过程中食品各部分温差的表达式。在此基础上,探讨了各相关参数对温度分布的影响。结果表明：食品的比热容、沸腾系数和密度影响温度下降的速度,但是对达到预定温度时的总温差没有影响;提高食品的透气性参数值和减小食品内部点到表面的最短距离,可以减小温差;可以通过调节真空室的压力变化,提高食品温度分布的均匀性。     

超级杂交稻Ⅱ优航1号高产栽培产量结构分析

【目的】揭示超级稻Ⅱ优航1号的高产结构特征。【方法】2005-2006年调查了75块Ⅱ优航1号不同产量水平的产量结构,进行相关分析和通径分析。【结果】结果表明,每穗粒数对产量的贡献为61.47%,每公顷穗数为25.59%,结实率为9.32%。每公顷穗数和每穗粒数对每公顷总粒数的贡献分别为35.48%和62.70%。每公顷总粒数对库容量的贡献为99.96%。库容量对稻谷产量的贡献89.05%,结实率的贡献为10.23%。【结论】说明Ⅱ优航1号超高产的关键是应培育足穗大穗,增加单位面积的总粒数,扩大库容量,并注重提高结实率。     

台尔曼忍冬组织培养技术工厂化繁育研究

以台尔曼忍冬为试材进行织培养工厂化繁育。结果表明:台尔曼忍冬适宜的分化培养基配方为MS+0.6mg/L 6-BA+0.1mg/L NAA+100mg/L水解乳蛋白,分化系数为3.2;筛选出适宜的生根培养基配方为1/2MS+0.6mg/L 6-BA+0.1mg/L NAA,生根率92%;练苗5～7d后,在草炭∶蛭石∶珍珠岩=2∶1∶1的基质中移栽,成活率90%;大田定植成活率为95%。该研究建立了台尔曼忍冬组织培养技术工厂化繁育体系,达到了高效快速,且再生繁育体系稳定性好,可为今后的台尔曼忍冬组织培养繁殖技术提供参考。     

河南省野生葡萄属植物资源保护评价

为科学评价河南省野生葡萄属植物资源,根据资源调查数据结合资料报道,以"濒危系数"和"优先保护值"为指标,制定了河南省野生葡萄属植物资源优先护存等级定量评价指标体系,并进行了优先保护排序,为野生葡萄属植物的保护、开发利用提供了理论依据。