Investigation of the grain refining performance of Al-5Ti-1B master alloy on the recycling process of A356 alloy

In this paper, the grain refining performance of Al-5Ti-1B master alloy on the recycled A356 alloy is investigated using the macrostructure examination and chemical analysis. Results show that Al-5Ti-1B is composed of the dispersion of blocky TiAl₃ particles and mixtures of small TiAl₃ and TiB₂ particles. Both particles refine grain structures of A356 alloy. As the initial recycling process proceeds, A356 alloy still exhibits fine structures. However, during the subsequent recycling process, the grain size of A356 alloy become larger. The concentration of titanium and boron decreases with increasing the number of recycling, especially in the subsequent recycling process. It is proposed that recycling of refined A356 can best be conducted in the initial recycling process and then additional grain refiner needs to be added to maintain the grain refining performance for the continuous recycling process of A356 alloy.     

Reliability of masonry walls subjected to in‐plane loading: A slip failure along head joints / Zuverlässigkeit von Mauerwerkswänden bei Belastung in der Ebene: Versagen entlang der Stoßfugenflucht

Masonry structures are a sustainable, economical and traditionally widely used type of construction. However, current masonry design codes are rather conservative, so there is a growing need for revision i.e. calibration of safety factors to improve the allocation of material resources. In this paper, we investigate the probability of occurrence of slip failure along head joints (perpends) in masonry subjected to in‐plane loading. An appropriate limit state function is established and the masonry material properties and loads are defined as random variables in order to simulate likelihood of occurrence of a slip failure regime along the head joints. Furthermore, an example of masonry wall with probabilistic analysis outcomes using Monte Carlo simulation is presented and recommendations for further work are provided.     

NOVELL网络工作站Shell及点对点通信软件的剖析

本文对Ｎｏｖｅｌｌ网Ｎｅｔｗａｒｅ３．１１版工作站ｓｈｅｌｌ软件及点对点通信软件作了详尽的剖析，并给出了其工作流程，具有一定的理论与实用价值。     

贴标机凸轮齿轮组合机构的研究

从机理方面对全自动回转贴标机的关键部件－上胶,取标、送标凸轮一齿轮组合机构进行了分析,得出该机构合理的设计方案,为设计贴标机提供理论依据。     

利用统计的方法对大比例尺基础地理数据建库存在的问题进行分析

主要介绍了如何设计表格进行问题统计以及对统计的结果进行分析,为以后在大比例尺基础地理数据建库的作业中减少问题的发生,提出合适的解决方法.     

Schrägseilbrücke für Straßenbahn‐, Geh‐ und Radverkehr

Cable‐stayed bridge for tramway, pedestrians, and bike traffic. For the development of the new quarter “Parkstadt Schwabing” in den North of Munich, the transport connection is established by a new tramway, the line 23. Thereby, a new bridge construction became necessary for the crossing of the main circular roadway “Mittlerer Ring” at the Schenkendorfstraße. The extraordinary bridge structure in direct conjunction with the glass enclosure of the Petuel‐tunnel belongs to the most spectacular metropolitan crossing locations of Munich.