深圳华为电气厂房预应力工程的设计与施工

１工程概况深圳华为电气厂房为３层预应力混凝土框架结构 ,建筑面积５７０００ｍ２ ,平面尺寸１２８ｍ×１４４ｍ ,标准柱网１６ｍ×１２ｍ。结构平面内不设温度伸缩缝 ,仅在施工时设置４条相互垂直的２ｍ宽膨胀带（图１）。框架梁采用有粘结预应力技术 ,１６ｍ跨的截面尺寸为８００ｍｍ×９００ｍｍ ,１２ｍ跨的截面尺寸为６００ｍｍ×８５０ｍｍ,最大高跨比接近１／１８。次梁为非预应力井字梁 ,网格尺寸４ｍ×４ｍ。梁板结构采用Ｃ４０微膨胀混凝土。为保证结构的抗裂能力 ,１６ｍ跨框架梁支座均做２００ｍｍ加腋。该工程由香港王董国际…     

一种简单的溶剂热法合成炭微球

利用一种简单的溶剂法合成炭微球.采用无水乙醇作为碳源和溶剂,以无水乙醇还原Ni(Ac)_2得到的Ni作为催化剂,最佳反应条件:温度500℃、时间48h.采用X-射线衍射仪(XRD)、透射电子显微镜(TEM)、扫描电子显微镜(SEM)以及Raman光谱对样品的成分、晶体结构和形貌进行了分析.结果表明:产品为圆球形和纺锤形两种形貌的炭微球,圆球形炭微球直径为1μm～2μm,纺锤形炭微球直径为1μm～2μm,长度为3μm～6μm.此法简便易行,炭微球的产率高达95%以上,且具有较规则的形貌和窄的尺寸分布.     

Catalytic cracking of endothermic fuels in coated tube reactor

Suspensoid of HZSM-5 or HY zeolites mixed with a self-made ceramic-like binder was coated on the inner wall of a tubular reactor by gas-aided fluid displacement technology. The coated zeolites were characterized by means of X-ray diffraction (XRD), Fourier transform infrared spectroscopy (FT-IR) and scanning electron microscopy (SEM). The coating thickness is 10–20 ?m and the particle size of the zeolites is in the range of 1–5 ?m. In the coated reactor, cracking of endothermic fuels including n-dodecane and aviation fuel RP-3 was carried out separately under supercritical conditions at 600°C and 625°C to investigate their heat sinks and conversion of catalytic reactions. For the reaction catalyzed by HY(25% mass fraction) coating, the heat sink capacity of n-dodecane are 815.7 and 901.9 kJ/kg higher than that of the bare tube at 600°C and at 625°C, respectively. Conversion of n-dodecane also increases from 42% to 60% at 600°C and from 66% to 80% at 625°C. The coated zeolite can significantly inhibit the carbon deposition during supercritical cracking reactions.     

铸铁凸轮轴铸造技术及发展

合金铸铁凸轮轴已成为国内外轿车及轻型汽车应用的主流.介绍了铸铁凸轮轴的生产工艺及提高凸轮轴耐磨性的强化工艺,指出在目前生产条件下激冷法是使用最广泛的一种方法.同时.也介绍了凸轮轴在生产过程中经常出现的一些缺陷以及防止措施.     

稀土La＋Sr复合变质对ZL101A合金组织的影响

研究了稀土La Sr复合变质对ZL101A合金共晶硅形状的影响.分析了复合变质剂加入量、变质温度、保温时间和冷却速度对合金组织的影响.结果表明,当Sr加入量为0.015%时,加入0.2%的La即可达到很好的变质效果,显著减少了稀土用量.另外,复合变质不但解决了Sr的潜伏期问题,而且还使ZL101A合金在变质时对温度的敏感性降低,在720℃就可完全发挥变质作用.复合变质后,晶粒能够细化到0.5 mm,比单一稀土细化效果更好.同时得出,冷却速度越快变质效果越好.     

超前锚杆预支护在过断层破碎带施工中的应用

开掘工程巷道施工中,遇到大断层破碎带时,采用正常的锚网喷施工工艺,爆破后断层带围岩得不到及时控制,容易造成顶帮塌冒。采用高强树脂锚杆超前预支护,超前控制加固断层带松软破碎围岩,爆破成型率得到提高,有利于实现安全生产和快速掘进。介绍了黄沙矿采用超前锚杆预支护在-350 m回风石门施工穿越断层松软破碎带的实践应用和取得的效果。     

基于互信息的滚动轴承故障特征选择方法

信号特征提取与优化选择是实现滚动轴承故障模式快速有效分类的关键.针对滚动轴承故障信号特征提取,采用小波分解和奇异值分解得到信号的能谱和奇异谱,并计算Shannon熵和Renyi熵两种测度下的能谱熵和奇异熵;针对特征参数集的优化选择,提出利用基于互信息的最大相关最小冗余准则(mRMR)对特征参数集进行评价,通过贪婪搜索得到特征子集序列,利用LS-SVM交叉验证各特征子集的性能,提出确定最优特征子集所包含特征数目的准则.从信号处理、特征提取、特征选择和故障分类等方面构建了滚动轴承故障诊断的完整体系,实际故障诊断表明所提出方法的有效性和优越性.     

Preparation, Structure and Mechanical Properties of Nickel Based Porous Spherical Superalloy

 The porous superalloy materials with hollow spherical pores were fabricated by using metal powder sintering process. The scanning electron microscope (SEM) observation was applied to the test samples and it revealed that the pores of the porous material exhibited a uniform distribution and the apertures were of same size in principle. The sintering necks appeared between adjacent particles on metal skeleton after sintering. The mechanical properties of the test samples were analyzed and the result showed that this kind of materials possessed excellent energy absorption capability, and the compression resistance decreased with increasing the porosity and aperture.     

Application of Numerical Simulation Technique to Casting Process of Valve Block

 The numerical simulation technique was applied to the casting process of a valve type part. The mold filling and solidification stages of the casting were numerically analyzed. The filling behavior, solidification sequence, and thermal stress distribution were reproduced and the possible defects, such as cold shut and shrinkage, were predicted. Based on the simulation result, the double gating system was replaced by a single gating system. Meanwhile, the chills were used to regulate the solidification sequence of casting. To eliminate the cracks in the casting, the sand core was converted into a canulate one. By modifying the original process, the defects were eliminated and the casting with good quality was obtained.     

基于体型变化的东华原型修正

基于人体群体的体型变化规律对中国服装原型理论——东华原型(专利号02150747)进行持续性的发展研究。根据中国女性标准体1997年以来的体型变化,采用人体数据采集,样衣穿着补正方法进行实验,采用SPSS软件进行数据分析,研究中国女体标准体的体型变化特征,对东华原型进行结构修正。并从理论和主观评价2个方面验证东华原型修正版。验证结果表明,在静态外观造型评价中,修正后的东华原型较修正前有很大提高,最后完成了与东华原型的理论体系相配套的人台修正。