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免抹灰铝合金模板工法与现行设计、施工和验收规范体系存在的“碰撞”研究 被引量:2
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作者 蒋孙春 《建筑施工》 2017年第9期1403-1405,1411,共4页
免抹灰铝合金模板在高层住宅建筑的标准层施工中被广泛使用,但目前铝合金模板系统尚无相应的行业和国家规范。基于此,结合实际工程案例,研究分析了免抹灰铝合金模板在使用中与我国现行的设计、施工及验收规范体系存在的"碰撞"... 免抹灰铝合金模板在高层住宅建筑的标准层施工中被广泛使用,但目前铝合金模板系统尚无相应的行业和国家规范。基于此,结合实际工程案例,研究分析了免抹灰铝合金模板在使用中与我国现行的设计、施工及验收规范体系存在的"碰撞"之处并提出了相应的处理措施,以期为铝合金模板相关标准的制订提供参考。 展开更多
关键词 免抹灰 铝合金模板 规范体系 “碰撞”研究
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Analysis of disagreement between numerically predicted and experimental heat transfer data of impinging jet
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作者 周萍 叶良春 +1 位作者 周孑民 杨莺 《Journal of Central South University of Technology》 EI 2006年第5期486-490,共5页
The method of numerical simulation was applied to investigate the effects of jet impinging plate thickness and its thermal conductivity on the local heat flux distribution along the impinging plate. The results show t... The method of numerical simulation was applied to investigate the effects of jet impinging plate thickness and its thermal conductivity on the local heat flux distribution along the impinging plate. The results show that the two factors have great effects on the heat flux distribution. The non-uniformity of the local heat-flux on the impinging plate surface gets more profound as the plate becomes thicker and thermal conductivity gets larger. When Reynolds number is 5000, the ratio of nozzle-to-plate spacing to nozzle diameter is 5 and thermal conductivity is 16W/(m·K), and even for the plate with only 25μm in thickness, the non-uniformity of the heat flux cannot be neglected. When the plate thickness is 50 μm, only when thermal conductivity is as small as 1W/(m·K), the heat flux curve can be approximately treated as an iso-heat-flux boundary. In the experimental research, a real non-iso-heat-flux boundary is treated as an iso-heat-flux boundary, which would result in under-estimated Nusselt number value in the stagnation zone and an over-estimated value outside. Such an experimental Nusselt number distribution is taken to evaluate turbulent model, and the conclusion would be drawn that the turbulent model over-predicts the stagnation heat transfer. This is one of the important reasons why many literatures reported that k-ε turbulent model dramatically over-predicts the impinging jet heat transfer in the stagnation region. 展开更多
关键词 impinging jet EXPERIMENT numerical simulation heat flux
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An experimental study on impact contact with unilateral crack
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作者 赵亚丽 盖秉政 赵树山 《Journal of Harbin Institute of Technology(New Series)》 EI CAS 2003年第1期31-33,共3页
It is only an assumption to simplify the reality that there is no contact force between cracks. In many cases, unilateral crack may be more close to reality, i.e. there is a contact force between cracks. A dynamic exp... It is only an assumption to simplify the reality that there is no contact force between cracks. In many cases, unilateral crack may be more close to reality, i.e. there is a contact force between cracks. A dynamic experimental system was used to measure the contact force in organic glass with cracks. Curves of time versus contact force established through experiments show that the magnitude of contact force relates to the interrelation among external forces, contact points and falling points. 展开更多
关键词 unilateral crack IMPACT experimental study
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Molecular Axis Orientation in Charge Transfer Reactions Determined with a Reaction Microscope
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作者 Shao-feng Zhang Xin-wen Ma Xiao-long Zhu 《Chinese Journal of Chemical Physics》 SCIE CAS CSCD 2009年第6期621-626,J0002,共7页
Based on the reaction microscope at the institute of modern physics, the reaction mechanism in molecular ion-atom collisions is investigated experimentally. The features of this system is illustrated by a kinematicall... Based on the reaction microscope at the institute of modern physics, the reaction mechanism in molecular ion-atom collisions is investigated experimentally. The features of this system is illustrated by a kinematically complete experhnent performed for the collision process. Using the so-called list-mode data recording technique and the coincidence measurement, the momentum vector of each fragment from the molecular ion were recorded event by event. The orientation of the molecular axis for H2^+ dissociation reactions could be determined for each event in the off-line analysis. The measured orientation of the molecular ion is believed the same as the one at the instance of collision under axial recoil approximation. The polar angle resolution of the molecular orientation of ±8° was obtained. 展开更多
关键词 Reaction microscope Imaging technique Molecular orientation Hydrogen molecular ion DISSOCIATION
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