A New Strategy for Preparation of NiAl Bronze/Zn Composite by Friction Stir Processing

In this work, we successfully prepared a NAB/Zn composite using Zn wires by friction stir processing (FSP). During FSP, Zn-containing α matrix and (Fe, Ni)Al phases and nano α and CuZn grains with the size of less than 10 nm are formed on the top surface. The average microhardness of the composite is increased by 15 pct compared with the alloy without Zn, which originates from fine grains, CuZn particles strengthening, and more β′ phase.

     

Substrate Stimulated Orientation for Pure Aluminum

Oriented materials are of great importance, but their formation is rarely described. Here, nine Al/Al₂O₃ systems were designed to identify the dominant factors. Electron back-scattered diffraction indicates that the new Al crystal(s) with one or multiple orientation(s) can be stimulated by one single-crystal Al₂O₃ substrates. Synchrotron radiation diffraction shows that the preferred orientation(s) is/are determined based on the initial stage of the liquid–solid transition. The nonpreferred orientation can be suppressed through competition.

     

Induced fabric anisotropy of granular materials in biaxial tests along imposed strain paths

In granular materials, loading on an initially isotopic assembly usually induces particle rearrangement, and this is referred to as the induced anisotropy of fabric. A series of biaxial tests are conducted along various strain paths using DEM to investigate the evolution of the induced anisotropy. The evolution of both the overall contact network and the sub-networks (the strong and weak) are examined separately. Results of DEM simulations indicate that the evolution of the fabric deviator in the overall contact network can be described as a power function of the stress ratio prior to the peak stress ratio that depends on the imposed dilation rate. A unique fabric-stress relation is obtained for the strong sub-network, which is independent of the strain path, the initial porosity and the confining pressure. Moreover, deformation instability is observed only along dilatant strain paths, which can be related to the degradation or even collapse of a weak sub-network, even though the strong sub-network dominates the strength of the granular assembly.     

建筑智能化过程中的电气节能问题浅析

本文对智能化建筑电气节能技术应用的必要性及存在的问题进行了总结与分析,并结合笔者自身经验,提出了电气节能技术的优化策略。     

某型钢-混凝土结构大楼主要施工技术分析

湖南某大楼主要结构为型钢混凝土组合框架,工程中采用最佳的钢结构施工技术和措施,保证了大跨度后张法有粘结预应力楼盖框架梁和300t钢结构连廊整体提升施工质量,又提高了施工效率,使主体结构施工进度进行顺利,比原计划提前了2个月完成,具有很好的经济效益,为在同类工程提供很好的参考作用。     

嵌挤组装式混凝土砌块道路基层结构的试验应用

介绍了嵌挤组装式混凝土砌块道路基层结构的试验过程,论述了其道路组合设计方案及施工注意事项。嵌挤组装式混凝土砌块道路基层结构大幅度节约了施工时间,提高了工程质量。     

“中规中矩”的美好——临沧民主法制园会展中心工程设计

从90年代开始,我国各地就兴起了一股“会展热”,随着社会的发展其已成为现代都市中一种具有广泛职能兼容性的建筑综合体。现如今“会展”建筑作为城市必要的“几大件”,越来越多地出现在人们的视野中。以临沧会展中心为例,讲述了中规中矩的设计,成就了建筑师的美好。     

浅析梁思成师承关系

本文主要从梁思成少年时期、青年求学、巅峰时期学术研究三个阶段中每个阶段抽取出重要时期与信息对梁思成的师承关系做出简要分析与阐述。通过对梁思成师承关系的分析．可以从侧面了解近现代中国古建筑研究与保护的发展脉络。     

北京地区年采暖供热负荷的快速计算

如何快速、准确的算得年采暖热负荷是一个值得研究的问题。本文对北京地区年采暖热负荷的计算作了较详细介绍,适合供暖设计人员参考使用。     

夯能的传播和夯实柱体的形成（强夯加固机理探讨之三）

本文简要的介绍了波动理论。振动的传播就是能量的传播。沿途各点波的强度及其沿途的变化可用沿途各点的振幅的大小及其变化来表示。夯锤下存在一维波动，它决定了夯坑下夯实体按柱体形状往深部延伸发展。本文讨论对强夯工程夯点布置设计有重要参考价值。