点阵材料夹层结构主动冷却性能与热结构响应分析

点阵材料具有较高的比强度、比刚度,并具有显著的多功能性的特点。本文提出一类以点阵材料为夹芯的新型轻质主动冷却壁板,研究了该壁板的主动冷却性能与热结构响应。采用三维流固耦合共轭传热数值计算方法,考虑了点阵夹层结构与冷却液动态换热过程的相互影响,以及碳氢燃料与合金材料热物理性质随温度的变化,求解获得了流体与结构的三维瞬态温度场,并通过顺

主动冷却通道热流固耦合三维数值计算及构型应力分析

采用MFX方法建立了主动冷却通道三维热流固耦合数值计算模型，通过定义流固界面进行载荷传递作为相应的边界条件，分析中考虑了碳氢燃料及镍基合金材料热物理性质随温度的变化，求解获得了流场与结构的温度场以及结构的应力场。并比较了三种不同构型冷却通道的传热性能和结构响应。研究表明，冷却通道内壁面存在显著的应力集中，对焊接强度造成影响；半圆截面通道的传热性能最差，应力集中也最显著；当入口流速从5m/s降为2m/s时，冷却液流量减少减弱了冷却效果

Thermal-fluid-solid coupling analysis of light-weight actively cooled panel with lattice-framed material

提出一类以点阵材料为夹芯的新型轻质主动冷却壁板,研究了Ma=6条件下的该壁板的流固耦合传热性能及热结构响应性能,并从热防护、热强度和轻量化等几个方面与槽道式主动冷却结构进行了综合比较。采用三维流固耦合共轭传热数值计算方法,考虑了几种典型的点阵夹层结构与冷却液动态换热过程的相互影响,分析中考虑了碳氢燃料与合金材料热物理性质随温度的变化以及湍流换热,求解获得了流体与结构的三维瞬态温度场,并通过顺序耦合求解获得了结构的应力场。计算结果表明,在相同的热环境下,高孔隙率的轻质点阵夹层结构的流固界面换热性能远高于槽道式主动冷却结构,因此结构的最高温度也较低,同时应力集中问题也有所缓解。通过对不同构型的点阵夹层结构的比较发现,胞元构型对其传热性能和结构应力应变有显著的影响

Coadsorption of Para-toluene Sulfamide and 1.4-Butynediol at Mercury Electrode

用电毛细曲线、微分电容曲线、Ｓｔｕａｒｔ模型和自洽场分子轨道法（ＣＮＤＯ／２）研究对甲苯磺酰胺和１．４－丁炔二醇在汞电极上的共吸附特性。此共吸附本质上是一种物理吸附。在其最大的吸附电位附近，二者分别以侧卧与平卧方式吸附于汞表面，并在共吸附层中表现出静电斥力作用。当两者的浓度相等时，１．４－丁炔二醇的吸附占优势。The coadsorption characteristics of para-toluene sulfamide and 1,4-butynediol atmercury electrode have been studied by means of electrocapillary curve,differential capacity curve,Stuart model and the SCFMO method(CNDO/2).The coadsorption is a physical adsorption occuringnaturally. Lateral and flat orientations in the two adsorbates close to their maximum adsorptionpotential were considered respectively.Unlike attractive interactions of their own,there was arepulsive interaction at their coadsorption layer.A preferred adsorption of 1,4-butynediol occurredWhen they were at the same volume concentration.作者联系地址：湖南大学化学化工系Author's Address: Depart. Chem.Chem.Eng.Hunan Univ.,Changsha 41008

An ESR Study of Free Radicals in Electroreduction Process of Allyl Alcohol

烯丙醇电还原自由基中间产物的ＥＳＲ研究张敬东，旷亚非，黄树坤，谢乃贤（湖南大学化学化工系，长沙４１００８２）汪风珍，陈德文（中南工业大学测试中心，长沙４１００８３）（中国科学院化学研究所，北京１０００８０）Ｈｏｒａｎｙｉ［１］、陈剑［２］等人对酸性水...Electrochemical-ESR technique with spin trap phenyl-t-butyl nitrone(PBN)was used to study the intermediates of electroreduction of allyl alcohol at platinized platinum electrode in acidic alcohol-aqua solution. Hydrogen and allyl group and(or)propyl group radicals were identified by a hyperfine spectrum of the radical adducts,and that provided a direct evidence for the presence of these radicals in the electroreduction of allyl alcohol.作者联系地址：湖南大学化学化工系，中南工业大学测试中心，中国科学院化学研究所，长沙水利电力学院化学系Author's Address: Dept.of Chem.and Chem. Eng.,Hunan University,Changsha 410082Wang FengzhenCentre Laboratory,Centre South University of Technology,Changsha 410083Chen DewenInst.of Chem.,Academia Sinica,Beijinq,10008

JUNO Sensitivity on Proton Decay p→νˉK+p\to \bar\nu K^+ Searches

The Jiangmen Underground Neutrino Observatory (JUNO) is a large liquid scintillator detector designed to explore many topics in fundamental physics. In this paper, the potential on searching for proton decay in $p\to \bar\nu K^+$ mode with JUNO is investigated.The kaon and its decay particles feature a clear three-fold coincidence signature that results in a high efficiency for identification. Moreover, the excellent energy resolution of JUNO permits to suppress the sizable background caused by other delayed signals. Based on these advantages, the detection efficiency for the proton decay via $p\to \bar\nu K^+$ is 36.9% with a background level of 0.2 events after 10 years of data taking. The estimated sensitivity based on 200 kton-years exposure is $9.6 \times 10^{33}$ years, competitive with the current best limits on the proton lifetime in this channel

JUNO sensitivity on proton decay p → ν K + searches*

The Jiangmen Underground Neutrino Observatory (JUNO) is a large liquid scintillator detector designed to explore many topics in fundamental physics. In this study, the potential of searching for proton decay in the $p\to \bar{\nu} K^+$ mode with JUNO is investigated. The kaon and its decay particles feature a clear three-fold coincidence signature that results in a high efficiency for identification. Moreover, the excellent energy resolution of JUNO permits suppression of the sizable background caused by other delayed signals. Based on these advantages, the detection efficiency for the proton decay via $p\to \bar{\nu} K^+$ is 36.9% ± 4.9% with a background level of $0.2\pm 0.05({\rm syst})\pm$$0.2({\rm stat})$ events after 10 years of data collection. The estimated sensitivity based on 200 kton-years of exposure is $9.6 \times 10^{33}$ years, which is competitive with the current best limits on the proton lifetime in this channel and complements the use of different detection technologies