脉冲TIG焊熔池几何参数的计算机视觉检测

利用自行建立的基于计算机视觉的脉冲ＴＩＧ焊熔池几何参数检测系统,从工件的正面利用ＣＣＤ传感器拍摄到了清晰的熔池图像,针对熔池图像的特点,设计了快速有效的图像处理算法,实时检测出了熔池的最大宽度、半长、后部面积、后拖角等重要几何参数,为下一步对焊接质量实时控制打下了良好基础。     

楼板开大洞框支剪力墙结构动力特性研究

以某高层商住楼结构为原型,建立了楼板开大洞的框支剪力墙结构空间有限元分析模型,研究了结构参数改变对其动力特性的影响。认为楼面开洞率不宜过大,在开洞的楼板间宜层层设置或隔层设置连接构件,并应设置落地核芯筒,以加强结构整体性。     

Interaction of Zn and Zn–4Al,Zn–15Al (wt-%) solder alloys with aluminium

The interaction of pure zinc and Zn–4Al, Zn–15Al (wt-%) solder alloys with aluminium has been investigated. Two different experimental techniques were used: (i) the aluminium samples soldering and (ii) the holding of liquid solder alloys inside the hollow in an aluminium base. The aluminium content was determined in samples after contact with aluminium at various temperatures and various holding times. It is shown that in soldered seams and solder alloys that had been held inside the aluminium base, the content of the aluminium was higher than at the points on the liquidus line on the Zn–Al equilibrium phase diagram at the corresponding temperatures and increases along with an increase in the holding time. This was apparently due to isothermal solidification.     

Radiant floors integrated with PCM for indoor temperature control

The control of indoor thermal comfort in buildings through thermal inertia during the summer season plays a fundamental role in the design of energy efficient buildings, especially in the Mediterranean climate. In fact, lightweight, highly insulated buildings cannot provide the necessary mass to buffer thermal gains. Phase change materials (PCM) have been used to provide lightweight building components with the required thermal inertia without increasing their overall mass. So far the integration of PCM into lightweight piped radiant floors for the control of thermal comfort during summer cooling regimes has not been investigated. This paper reports the development of a lightweight piped radiant floor prototype with an integrated PCM layer aimed at buffering internal gains at constant temperature during summer cooling regimes without affecting its winter warming capacity. Both the construction of the laboratory specimens and the development of the optimized finite element models are detailed and the assessment of the floor performance in a simulated room is discussed.     

纤维增强轻质混凝土在楼地面保温的应用

介绍了纤维增强轻质混凝土特点及其在楼地面保温隔热上的施工工艺和施工方法,同时阐述了有关注意事项。     

CAPL缝焊工艺优化方法与模型

本文建立了一种缝焊工艺优化新方法，导出了连续缝焊条件下反映各工艺参数与焊件材料性质之间关系的数学模型，为缝焊工艺的优化打下了基础。     

思茅八层框架筒体震损机理初探

文章通过对思茅8层框架筒体结构——振华大楼实际震害的调查分析,建立合理的简化计算模型进行计算,所得结果与实际震害比较,对其破损机理进行了初探。     

隔层悬挂楼盖的新型抗震结构体系

提出一种在普通多，高层框剪结构中隔层将楼盖悬挂在柱上的新型抗震结构体系，它集悬挂结构，质量制振结构及塑性铰内移内移式框架结构的抗震优越性于一体，只需要对普通框剪结构稍作改进即成。该体系受力传力清楚，施工方便。结构动力分析表明，所提出的体系减震效果优良。如果推广应用，将产生较大的经济及社会效益。     

Les pompes de chaleur manquent encore d'intérêt du point de vue coût

Lors d'une réunion ayant eu lieu il y a quelques mois, un sous-groupe technique de la commission de travail CIB W 67 sur la conservation de l'énergie a passé en revue les possibilités et les problémes des pompes de chaleur. La réunion a confirmé que les possibilités des pompes de chaleur sont considérables quant à la conservation de l'énergie et tous les pays sont tellement intéressés que le besoin d'une collaboration dans les recherches s'est intensifié.     

房屋分层分户图信息管理软件的开发及相关技术

本文对开发房屋分层分户图管理系统的主要技术与方法如平台的选择、各种类型的建筑面积的计算及分摊、图形与属性数据的关联及在产权产籍其它管理软件中对此系统的嵌入等进行了介绍 ,并提出了相应的解决方法。实践表明 ,这些方法对房屋分层分户图管理系统走向实用不仅是可行的 ,而且是方便高效的。