基于流固耦合的铅铋回路冷却器应力分析

基于流固耦合的方法对KYLIN-II液态铅铋回路中的冷却器进行了应力分析与强度评定.首先在ANSYS Fluent中进行计算流体动力学CFD(Computational Fluid Dynamics)分析,获得了冷却器中准确的温度分布;然后将冷却器的温度以热载荷的形式导入ANSYS Mechanical软件中,并考虑流体的静压载荷,设计了两种不同工况,开展冷却器结构静力分析;最后基于JB 4732-95标准对计算结果进行应力分类和强度评定.结果表明,换热管与管壳连接处存在应力集中现象,但结构仍然满足强度要求,冷却器的结构设计方案合理、可行.     

SST-1 Refurbishment Progress: an Update

Refurbishment of steady state tokamak (SST-1) primarily focused at addressing the issues and bottle-necks involving various subsystems of SST-1 as observed during earlier commis- sioning attempts, have progressed significantly. Under the refurbishment spectrum, all joints in the superconducting magnet system have been re-fabricated as low DC leak tight joint resistances, all toroidal field (TF) magnets have been equipped with 5 K radiation shields on the inner side and successfully tested for their rated parameters in cold under nominal currents, all vessel sectors and modules have been baked and tested under representative conditions, supporting helium and ni- trogen cryogenic facilities have been made > 99% reliable in various envisaged operating scenarios of SST-1. The reassemblies of the critical subsystems of the SST-1 machine shell have progressed aggressively and are nearing completion. Auxiliaries such as the baking facility for the vacuum vessel and first wall components, current leads assembly distributions, synchronized timing sys- tem, reliable data acquisition and plasma control systems as well as essential diagnostics have also been readied towards the first plasma. A detailed engineering validation of the assembled SST-1 machine shell including field error measurements has been planned prior to first plasma attempts.     

Low-cost modular system of machine-to-computer communication for a flexible machining cell

Cranfield Robotics and Automation Group (CRAG) in collaboration with Texas Instruments (UK) manufacturing systems research group has built a flexible machining cell and established computer integrated manufacturing support facilities to demonstrate a low-cost, modular system of machine-to-computer communication.     

大运河建筑历史遗存考察纪略

引子作为历史文化遗产的大运河,肇始于春秋时吴王夫羞之凿邗沟,至隋代完成了以洛阳为中心的大运河,此线于唐宋时繁盛一时;元代截弯取直,形成了贯通南北的京杭大运河;在明代和清代前、中期,京杭大运河成为漕运通道,屡加疏通,构成贯通海河、黄河、淮河、长江、钱塘江五大水系的大动脉,对中国古代国家的统一和经济文化交流曾经发挥过重大作用。穿越时空的大运河,纵贯南北,连接     

离子交换浓集-α谱仪测定水中U,Th和~(234)U/~(238)U,~(230)Th/~(232)Th

研究了水中10~(-3)ppm级铀、钍在硫酸盐型D235和氢型D033大孔离子交换树脂上定量浓集的条件。被树脂吸附的铀和钍经洗脱后,分别用恒电流电镀,制备无自吸收U,Th α源,进行α谱仪测量。方法用于测定水中10~(-3)ppm级U和~(234)U/~(238)U时,精密度在±10%以内,Th和~(230)Th/~(232)Th精密度在±7%以内。     

丝纤维及其织物的起皱机理

丝纤维及其织物的起皱程度与溶剂极性和生成氢键能力密切相关,且受溶剂分子的体积和粘度的影响,其中丝纤维在50%乙醇溶液中的起皱现象最为严重。     

江苏区域重磁资料的大地深部构造分析

根据航磁长波异常,将全区磁性基底划分为八个升降隆坳带。基底顶深最浅6.5公里,平均9公里。根据区域布格重力异常,全区莫霍面可分为六个升降区。莫霍面升降梯度较缓,最大幅度在5～6公里以内。在苏中、苏南、浙西、皖南地区,莫霍面与磁性基底升降大体一致。由航磁区域场垂向二次导数,圈出111个深部隐伏磁性体,其顶深为4～9公里,推测为深部隐伏岩浆库。     

RiskA事件树模型转换模块的研发

我国的核电行业大多采用国外商用PSA软件作为其概率安全分析工具,其中Risk Spectrum是国内目前应用最广泛的PSA软件。RiskA是FDS团队自主研发的具有完全自主知识产权的大型集成概率安全分析可靠性软件系统。为了保证核电站PSA事件树模型的可靠性,在深入分析Risk Spectrum、RiskA的事件树存储结构基础上,设计并开发了事件树模型识别模块,该模块能够实现Risk Spectrum事件树模型向RiskA事件树模型的自动转换。     

利用ITER基准模型对MCAM4.2进行检验(I)

利用ITER三维基准模型对蒙特卡罗方法粒子输运自动建模软件MCAM4.2进行了检验测试,实现了CAD工程模型的预处理,自动转换生成MCNP计算输入文件,并完成测试要求的中子壁负载和偏滤器中子注量率与核热沉积的计算。ITER模型的成功处理与计算表明MCAM能够正确和有效地处理大型复杂几何模型。