Seawater desalination plant using nuclear heating reactor coupled with MED process

A small size plant for seawater desalination using nuclear heating reactor coupled with MED process was developed by the Instituted of Nuclear Energy Technology,Tsinghua University,China,This seawater desalination plant was designed to supply potable water demand to some coastal or island where both fresh water and energy source are severely lacking ,It is also recommended as a demonstration and training facility for seawater desalination using nuclear energy. the desing of small size of seawater desalination plant couples two proven technologies:Nuclear Heating Reactor(NHR) and Multi-Effect Destination (MED) process.The NHR desing possesses intrinsic and passive safety features,which was demonstrated by the experiences of the project NHR-5.The intermediate circuit and steam circuit were designed as the safety barriers betewwn the NHR reactor and MED desalination system.Wihin 10-200MWt of the power range of the hating reactor,the desalination plant could provide 8000 to 150,000m^3/d of high quality potable water,The desing concept could provide 8000 to 150,000m^3/d of high quality potable water,The design concept and parameters,safety features and coupling scheme are presented.     

结构-桩-土的地震反应分析

通过分析软土地基下桩承高层建筑的相互作用,发现在高层建筑的抗震分析中考虑结构－桩－ 土相互作用是必要的,按照刚性地基假定进行计算并不一定就是安全的。     

广州新客站大型铸钢件超声波探伤方法浅析

铸钢件铸造表面粗糙,导致声耦合不良,造成散乱反射,形成干扰杂波,使超声波探伤变得困难,本文探讨用工件底波法调整探伤灵敏度,比较在不同加工面测得的回波声压（实测耦合补偿值）,在实际检测工件时进行耦合补偿,便利在现场探伤条件下,针对工件厚度及表面状况的变化作出及时的修整,保证探伤结果的准确、可靠。     

Preliminary safety analysis for heavy water-moderated molten salt reactor

The heavy water-moderated molten salt reactor(HWMSR)is a newly proposed reactor concept,in which heavy water is adopted as the moderator and molten salt dissolved with fissile and fertile elements is used as the fuel.Issues arising from graphite in traditional molten salt reactors,including the positive temperature coefficient and management of highly radio-active spent graphite waste,can be addressed using the HWMSR.Until now,research on the HWMSR has been centered on the core design and nuclear fuel cycle to explore the viability of the HWMSR and its advantages in fuel utilization.However,the core safety of the HWMSR has not been extensively studied.Therefore,we evaluate typical accidents in a small modular HWMSR,including fuel salt inlet temperature overcooling and overheating accidents,fuel salt inlet flow rate decrease,heavy water inlet temperature overcooling accidents,and heavy water inlet mass flow rate decrease accidents,based on a neutronics and thermal-hydraulics coupled code.The results demonstrated that the core maintained safety during the investigated accidents.     

基于改进的Voronoi图划分的边界元衬底耦合参数提取技术

提出了一种快速而准确的数模混合集成电路衬底耦合参数提取方法。采用边界元法求解衬底耦合电阻,与有限差分法相比,计算速度提高了一个数量级以上,且可以保持精度,结合改进的Ｖｏｒｏｎｏｉ图来划分版图,生成的衬底ＲＣ网络数目远小于同样采用Ｖｏｒｏｎｏｉ图的文献「４」,而且解决了文献「４」中由于解析公式计算衬底电阻导致精度不高的问题。     

瓦斯运移规律气固耦合数值模拟研究

在高瓦斯矿井实测了瓦斯基本参数,运用数学偏微分方程,建立了瓦斯运移方程,嵌入仿真数值模拟软件,分别对不同埋深和瓦斯压力下对瓦斯渗流速度、瓦斯渗透率进行了模拟研究。模拟得出埋藏深度和瓦斯压力对渗流速度基本无影响,而埋深和瓦斯压力增加,渗透率较低。渗流速度和渗透率因采动破坏而变化,在煤体原始状态趋于稳定。瓦斯运移气固耦合模拟研究,为矿井配风和瓦斯防治提供了一定的指导。     

马来酸酐接枝聚乙烯蜡的研制

考察了引发剂种类用量、马来酸酐加量、反应温度、反应时间、聚乙烯蜡分子结构等因素对马来酸酐接枝聚乙烯蜡的接枝率、接枝效率、气味、颜色、交联程度的影响。结果表明二叔丁基过氧化物是一种优良的接枝反应引发剂 ,在引发剂加量 0 .2 % ,马来酸酐加量 4 % ,反应温度 1 50～ 1 6 0℃ ,反应时间 3h的条件下 ,接枝率大于 1 .5% ,该接枝蜡可作为一种新型偶联剂应用在塑料填充料中     

电磁轴承驱动级电压与电流对转速和控制精度影响的研究

从机电耦合的角度研究了电磁轴承驱动级电源电压、控制电流对转速和控制精度的影响。导出了根据转速和控制精度选取电源电压和控制电流的两个公式,为设计提供了理论根据。设计实例的试验结果和理论分析取得了很好的一致性。     

基于流固耦合的南水北调渠道结构动力破坏机理研究

以南水北调中线渠道工程为研究对象,建立了水体-结构-地基耦联体系的渠道模型,运用Fluid 30单元实现水工结构流固耦合计算,计算了地震工况下的渠道结构的破坏情况。计算结果与Westergaad传统方法进行对比,验证了Fluid 30单元方法的正确性。研究结果表明,Fluid 30单元耦合方法计算的结构频率均值较传统方法增加10. 93%,渠道结构进行地震分析时,水体的流固耦合效应不容忽视;渠道衬砌板分缝处为最薄弱部位,且出现了应力集中,每个纵缝处下表面均出现了较大的拉应力;衬砌结构在地震中可视为做整体移动,衬砌上表面比下表面所受的压应力更大,而在接近分缝处这一情况恰好相反。