世行贷款项目国内竞争性招标与国内项目公开招标的区别

结合世行贷款江苏省淮河流域重点平原洼地治理项目泰东河工程招标投标工作,对比分析世行贷款项目国内竞争性招标与国内项目公开招标两种方式,从招标过程中的各环节差异提出应重点关注的问题,为做好类似项目招标投标提供一定借鉴.     

地震层析成像技术在坝肩地质缺陷评价中的应用

以锦屏一级水电站左岸坝肩抗力体1 785 m高程基础处理洞室群为工程研究背景,采用地震层析成像技术对其地质缺陷进行评价,以便为加固处理提供可靠依据。介绍了地震层析成像技术的原理和方法,重点对地震层析成像解译结果与现场岩体质量分级结果进行了对比分析。结果表明,采用地震层析成像技术对复杂地质条件下坝肩地质缺陷进行分析评价是可行的,分析结果比较可靠。可为同类工程参考。     

绍兴滨海新城分质供水运行实践经验

根据绍兴市水资源现状与绍兴滨海新城开发实际情况,在分析绍兴滨海新城分质供水的必要性和可行性基础上,介绍了滨海新城分质供水的模式、范围,以及为提高供水安全性,在分质供水的两路供水管适当位置设置连通管等具体实施办法.总结了滨海新城分质供水实践中存在的水质、水量、水压等方面的问题,指出了分质供水运行管理制度、操作规程和紧急事故应对措施以及国家关于工业水质方面规范制度的不足.     

A generalized finite-difference time-domain quantum method for the N-body interacting Hamiltonian

The Quantum Finite-Difference Time-Domain (FDTD-Q) method is a numerical method for solving the time evolution of the Schrödinger equation. It can be applied to systems of interacting particles, allowing for realistic simulations of quantum mechanics of various experimental systems. One of the drawbacks of the method is that divergences in the numerical evolution occur rather easily in the presence of interactions, which necessitates a large number of evolution steps or imaginary time evolution. We present a generalized (GFDTD-Q) method for solving the time-dependent Schrödinger equation including interactions between the particles. The new scheme provides a more relaxed condition for stability when the finite difference approximations for spatial derivatives are employed, as compared with the original FDTD-Q scheme. We demonstrate our scheme by simulating the time evolution of a two-particle interaction Hamiltonian. Our results show that the generalized method allows for stable time evolutions, in contrast to the original FDTD-Q scheme which produces a divergent solution.     

重型加工中心横梁部件的热态特性分析

以XK2535镗铣床的横梁为研究对象,建立实体模型,针对横梁与导轨副之间的摩擦导致的热变形,用ABAQUS对其进行热稳态特性分析.通过分析计算,当镗铣头以10mm/min移动时,横梁最高温度为50.8°C,位于横梁导轨副最上端处的热变形量最大,为205μm。通过对横梁的热特性分析,为机床的热补偿提供了重要依据.     

喷射式超重力旋转床的压降研究

喷射式超重力旋转床是一种新型高效的气液传质设备,旋转床的气相压降是旋转床应用和设计的一项重要指标.以空气-水体系在常压条件下,对喷射式旋转床的气相压降进行了实验研究.实验表明:喷射式旋转床的气相压降随F因子和转速的增大而增大,喷淋密度的增加对气相压降影响不明显.当转速为800r/min,F因子为1.24kg0.5/(m0.5·s),喷淋密度为11.76m3/(m2·h),压降为800Pa时,回归的气相压降模型表明:气相压降与转速的平方、F因子的平方和液量的负四次方有关.     

SVC动态特性对风电场接入电网电压稳定性的影响

以多数风场配置的无源无功补偿装置为例,构建TCR/MCR型SVC仿真控制模型,研究它们在风场动稳和暂稳期间的响应特性,分析它们对风电运行电压稳定的改善作用仿真结果表明TCR/MCR型SVC对于提高风电场电压稳定性均具有明显的作用,但前者能更快地跟踪电压波动,快速调整无功输出,更好地抑制了电压波动.     

废水生物处理技术及其研究进展

随着经济的快速发展和生活水平的逐渐提高,废水排放量也随之增多,造成的环境污染日趋严重.废水生物处理因其诸多优点而被广泛应用.本文综述了包括厌氧生物处理法、活性污泥法、生物膜法、氧化塘法等废水生物处理技术的原理、特点、分类和应用,介绍废水生物处理法的前沿动态、应用进展及发展趋势.     

Preparation and adsorption property of phenyltriethoxysilane modified SiO2 aerogel

The hydrophobic silica aerogel (SiO₂ aerogel) was prepared by in situ polymerization sol-gel method and ethanol supercritical drying, with tetraethoxysilane (TEOS) as silica source, phenyltriethoxysilane (PTES) as modifier, ethanol as solvent and ammonia as catalyst. The effects of n(PTES)/n(TOES) were investigated on gel time, structure, and hydrophobicity. The SiO₂ aerogel was measured by Fourier transform infrared spectroscopy (FT-IR) and scanning electron microscopy (SEM). The effects of n(PTES)/n(TOES) were also studied on adsorption property of pentane, hexane, heptane, octane, benzene, toluene, o-xylene, nitromethane, nitroethane, and nitrobenzene. The adsorption intensity of SiO₂ aerogel was compared with that of activated carbon. The results show, with the increasing of n(PTES)/n(TOES), the surface area, pore volume, and pore size of SiO₂ aerogel decreased, gel time and hydrophobicity increased, and the contact angle could be 154° with n(PTES)/n(TOES)=0.7. The adsorption intensity of SiO2 aerogel with n(PTES)/n(TOES)=0.5 was bigger than that of activated carbon with an average 5.84 times of 10 organic liquid. The adsorption intensity of aerogel with n(PTES)/n(TOES) =0.1 was the best one in all samples with the average 8.33 times compared with that of activated carbon.     

企业文化建设的实践与探索——基于企业品牌建设的视角

企业文化建设是引导企业先进理念不断形成的基础,它有利于员工按企业大目标来建立起自身的奋斗指向,充分调动员工在日常工作中和技术创新中的积极性和主动性,不断增强员工的凝聚力和向心力。南车品牌体现了先进的思想和超前意识,形成了独具特色的品牌文化和品牌精神,并以品牌推动南车核心竞争力的增强,进而持续为用户创造价值,为员工创造机会,为社会创造效益。