对“小城镇”定义及“三农”问题的思考

20世纪80年代以来，对“小城镇”这一命题未能形成统一的概念，也没有明的规定，各界对“小城镇”的涵盖范围存在颇多的争议。本着“理性的怀疑、多元的思考、平权的争论和实践的检验”的求知欲望，商榷“小城镇”这一定义的科学性及其影响，确立科学的城乡发展观，对探索解决“三农”问题的途径，具有现实的意义。     

Selective adsorption of p-chloronitrobenzene from aqueous mixture of p-chloronitrobenzene and o-chloronitrobenzene using HZSM-5 zeolite

The selective adsorption of p-chloronitrobenzene (p-CNB) using zeolite as the adsorbent from an aqueous mixture containing p-CNB and o-chloronitrobenzene (o-CNB) was investigated. The maximum adsorption amounts of p-CNB in HZSM-5 zeolite were found to be approximately 4 molecules per unit cell (mol/uc) at all adsorption temperatures investigated. The maximum adsorption amounts of o-CNB in HZSM-5 zeolite were, however, markedly lower than those of p-CNB at different adsorption temperatures. Diffusion results revealed that the diffusivity of p-CNB at 300K was about 100 times higher than that of o-CNB in HZSM-5 zeolite. The remarkable difference in the adsorption amounts and diffusivities between p-CNB and o-CNB resulted in separation factors of 463.6, 96.8 and 21.9 for p-CNB at 278, 300 and 323 K, respectively, indicating a selective adsorption of p-CNB in HZSM-5 zeolite from the aqueous mixture of p- and o-CNB.     

配套商品房的设计与实践

配套商品房作为住房保障的一种商品房模式,有其特殊的购买人群。文章就配套商品房选址、总体规划、房型设计阐述配套商品房的特点。     

关于燃烧和烟雾特征的研究

日本消防研究所山田常圭博士,从事消防科研20余年,取得了多项成果,荣获2004年度日本火灾学会奖。其科研概况如下:1疏散对策的研究疏散行为和疏散诱导研究主要内容是:1)火灾烟雾刺激对视认性的影响;2)在充满烟雾的走廊里,人在心理上的不安全感;3)关于安全出口指示灯容易辨认性评价;4)通过自愿者现场试验,探讨闪烁移动型光源的疏散诱导效果等。这些都属于“烟雾中逃生行为的可能性”专题。这个专题荣获1997年国际火灾安全科学会颁发的Emmons奖。在进行实验研究时,使用了一些独特的方法,如研究烟雾刺激性对视认距离下降的影响时,让操作人员戴…     

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.     

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。     

“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。     

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。