向家坝水垫塘的实验研究与数值模拟

多股水平淹没射流消力池的大量试验研究结果表明：泄槽的体形以等宽或微收缩为宜；水平方向窄而垂直方向厚的水舌适应水位变化的稳定性较好，能始终保持水平淹没射流状态；表、中孔的最优坎高差应大于中孔水流的主流水深，以使表层水跃的回流漩滚区向两侧表孔溢流面充分扩散，从而减弱或消除中孔表层水跃的横轴漩滚。用三维RNG k—ε紊流模型进行了数值模拟，将计算的消力池底板压强及水深与试验结果进行了对比，两者符合较好。     

小湾水电站枢纽区工程地质条件

小湾工程枢纽区地震地质条件复杂，地震基本烈度为Ⅷ度。坝址区地层呈单斜构造。横河展布。陡倾上游，岩性主要为黑云花岗片麻岩、角闪斜长片麻岩。两岸山体雄厚，地下水丰富，埋藏较浅；崩塌作用普遍；卸荷作用强烈，边坡稳定条件较差。岩体中高岭土化蚀变现象较普遍，陡倾角破裂结构面发育，且分布有顺坡中缓倾角节理，存在坝基(肩)抗滑和变形稳定问题。工程区属中高地应力区，地下洞室埋藏深度大，围岩以微风化一新鲜岩体为主，总体稳定条件较好。     

金鸡滩水电站灯泡贯流式水轮发电机设计综述

介绍金鸡潍水电站灯泡贯流式水轮发电机的电磁方案和结构设计,并总结机组设计开发的经验教训.     

云贵响水电站高水头主阀设备优化设计

水轮机进水阀门是响水电站关键设备之一，对提高机组运行安全可靠性和经济效益至关重要。在设计中，经过技术、经济论证，采用结构简单、操作方便和价格便宜、且有国内外经验可借鉴的高水头蝴蝶阀。     

邦朗水电站金属蜗壳的水压试验

缅甸邦朗水电站水轮机蜗壳试验压力为1．5倍工作压力即2．1MPa．保持30分钟。蜗壳进口端采用闷头封堵，用焊接的方式进行连接：在座环开口端用密封筒堵水，采用三道中Ф10mmO型密封圈封水。在座环上下法兰各设一道密封槽，密封筒下部设一道密封槽。蜗壳水压试验中各部焊缝均无渗满水现象，蜗壳进入门的平板型橡胶密封圈有渗满点，改增O型密封圈后效果将在后两台机上检验。     

Optimization of hydrogen stations in Florida using the Flow-Refueling Location Model

This paper develops and applies a model that locates hydrogen stations to refuel the maximum volume of vehicle flows. Inputs to the model include a road network with average speeds; the origin–destination flow volumes between each origin and destination; a maximum driving range between refueling stops; and the number of stations to build. The Flow-Refueling Location Model maximizes the flow volumes that can be refueled, measured either in number of trips or vehicle-miles traveled. Geographic Information Systems and heuristic algorithms are integrated in a spatial decision support system that researchers can use to develop data, enter assumptions, analyze scenarios, evaluate tradeoffs, and map results. For the Florida Hydrogen Initiative, we used this model to investigate strategies for rolling out an initial refueling infrastructure in Florida at two different scales of analysis: metropolitan Orlando and statewide. By analyzing a variety of scenarios at both scales of analysis, we identify a robust set of stations that perform well under a variety of assumptions, and develop a strategy for phasing in clustered and connecting stations in several stages or tiers.     

Aleatory Construction Based on Jamming: Stability Through Self-Confinement

The physical process of jamming could take architectural sustainability/recyclability to a whole new level. It involves achieving structural rigidity through the crowding of particles within a confined space, rather than by permanent bonding. Project Z-Form, a collaboration between a team of physicists from the JaegerLab at the University of Chicago – including PhD students Kieran Murphy and Leah Roth and professor Heinrich Jaeger – and artist Dan Peterman , sets out to develop a pourable material that not only self-supports but can also bear loads. Here they explain the project and the concepts behind it.     

Sampling based uncertainty analysis of station blackout in PSB VVER integral test facility

Best estimate accident analysis with uncertainty evaluation is being encouraged in the present licensing scenarios of nuclear power plants. This paper deals with uncertainty and sensitivity analysis for station blackout in PSB VVER integral test facility under the framework of coordinated research project of IAEA. Nodalization was developed using best estimate system code RELAP5/MOD3.2 and its steady state and transient level qualifications are achieved. Sampling based approaches are used to carry out uncertainty and sensitivity/importance analysis. The objective of the analysis is to get confidence for uncertainty methodology by comparing with the experimental results and extend its applicability to NPPs. Uncertainty analysis is carried out by selecting nine important input parameters with specified ranges and its uniform distributions. A design matrix of 45 × 9 is generated for variations of input parameters with the Latin Hypercube Sampling and 45 code runs were taken. Linear regression was also carried out to quantify the effect of each individual input parameter on output parameters in terms of standard rank regression coefficients. Uncertainty band in output parameters is defined between 95th and 5th percentile value. It is observed that most of the experimental values and code calculated reference values are lying within the uncertainty band. For most of the parameters, width of uncertainty band increases with transient progression time.     

核素核查数据安全认证模式及裂变核素的最低检测限度模拟

概述了国际放射性核素监测系统中对放射性核素数据在测量过程的安全认证的要求,在推导并模拟铀、钍系衰变链中的相应子体和＾７Ｂｅ等核素从取样至测量过程中放射性活度变化规律以它们比值的基础上,建立样品取样测量运动及认证模式,在计算机拟合的基础上给出了＾９７Ｚｒ、＾１３７Ｃｓ、＾１４０Ｂａ等与ＣＴＢＴ监测系统要求相关的裂变产物核素的最低检测限度,     

基于机器学习的高铁站评价模型

高铁站的选址一直处于矛盾之中,政府既要减少高铁站对民众生活的影响,又要考虑拆迁成本,如何让高铁站的选址更加科学成为一个需要深思熟虑的问题.为此,运用线性回归分析法、灰色预测法建立了经济贡献率模型,得到高铁站对该市的经济贡献率;以辽宁省已建成的高铁相关数据为基础,从建设投入、施工耗时、换乘方便度、经济贡献等角度进行考虑,...