在纳米压入仪上进行悬臂梁法测量弹性模量的影响因素分析

对在纳米压入仪上进行悬臂梁法测量弹性模量的主要影响因素进行了综合分析,主要包括加载系统悬置弹簧刚度、压头压入、梁沿截面宽度方向挠曲、梁支座附加挠曲等影响。在考虑这些因素的基础上,得到了悬臂梁的有效挠度,利用有效挠度与载荷之间的关系,评价悬臂梁材料的弹性模量。对单晶硅(100)悬臂梁试样进行了实验,得到其弹性模量为155GPa±9.5%GPa,与参考文献值符合较好。表明在纳米压入仪上进行悬臂梁法测量,只有综合这些影响因素后,才能获得有效、准确的弹性模量测量结果。     

回火过程应力场计算机模拟

回火过程应力场计算机模拟林家骝，杨振枢，于震宗，段贵明（清华大学）郭剑仁，史全兴，谢克仁（内蒙古第一机器厂）ＡＳｔｕｄｙｏｆＮｕｍｅｒｉｃａｌＳｉｍｕｌａｔｉｏｎｏｆＳｔｒｅｓｓＦｉｅｌｄｄｕｒｉｎｇＴｅｍｐｅｒｉｎｇ￥ＬｉｎＪｉａｌｉｕ；ＹａｎｇＺ...     

Investigation on gradient material fabrication with electron beam melting based on scanning track control

A new electron beam control system was developed in a general vacuum electron beam machine by assembling with industrial control computer, programmable logic control （PLC）, deflection coil, data acquisition card, power amplifier, etc. In this control system, scanning track and energy distribution of electron beam could be edited off-line, real-time adjusted and controlled on-line. Ti-Mo gradient material （GM） with high temperature resistant was fabricated using the technology of electron beam melting. The melting processes include three steps, such as preheating, melting, and homogenizing. The results show that the GM prepared by melting technology has fine appearance, and it has good integrated interface with the Ti alloy. Mo and Ti elements are gradually distributed in the inter.face of the gradient material. The microstructure close to the Ti alloy base metal is α ＋ β basket-waver grain, and the microstructure close to the GM is a single phase of β solid solution.     

平砧锻造的数值模拟──随动坐标能量法

平砧锻造是塑性大变形问题，本文采用随动坐标系跟踪流动质点，利用能量法分步计算质点位移增量、等效应变场等，然后叠加。计算结果得到实验验证。     

国产气相聚乙烯浆液催化剂的工业应用

本文简要阐述了北化院BCS01和上海院SLC-S两种国产气相聚乙烯浆液催化剂的性能、催化剂结构,在Unipol聚乙烯工业装置上应用结果,以及和进口同类催化剂UCAT-J的性能比较。     

ZrO2—SiO2—Al2O3系复相陶瓷制备及其耐磨性试验研究

利用等离子分解锆英石（PDZ）和锆英粉与Al2O3反应烧结制备了ZiO2-SiO2-Al2O3系复相陶瓷。利用XRD、SEM、反光显微镜、显微硬度计等测试手段，对烧成试样的物相组成、显微结构、显微硬度、气孔状况及耐磨性进行了测试分析与讨论。研究结果表明：含镁助剂的加入促进了反应烧结；由PDZ制备的试样的性能优于锆英粉原料的试样：较佳的原料配比为No.4即Al2O3:PDZ=3:1，其耐磨性优于氧化铝质研磨体，适宜的烧成温度范围是1580℃－1600℃。     

2,4,6-三硝基苯甲酸的合成工艺改进

对TNT(2，4，6-三硝基甲苯)氧化制备2，4，6-三硝基苯甲酸的工艺进行了深入的研究，结果表明氧化剂的种类、用量、加料方式及溶剂的种类对产物的收率有较大影响。TNT的较佳氧化工艺条件为：氧化20gTNT，以摩尔比为4：1的HNO3和HCI混合液作为溶剂，采用液体加料方式加入氧化剂KClO4 40g，2，4，6-三硝基苯甲酸的收率最高达96％。     

2007年上半年三大合成材料价格走势回顾与分析及下半年预测

回顾并分析了2007年上半年三大合成材料价格变化情况及其原因,预测了2007年下半年三大合成材料的价格走势.     

超声波处理微污染水体技术研究

考察了用超声波降解水中低浓度三氯乙腈、氯代苦味碱、溴苯的动力学，并从工程角度分析了多种污染物共存、自然水体等复杂状态下的可行性。探讨了采用空气鼓泡、不控水温的操作方式。结果表明超声波可以较快地去除复杂水体中的多种有机污染物，氧化可在批式反应器与连续流反应器中进行，高流速可以提高反应器的空间与能量利用效率。     

Mercury transformation across particulate control devices in six power plants of China: The co-effect of chlorine and ash composition

This paper presents the results of field measurements on mercury speciation in six power plants of China by applying the Ontario hydro method. During the tests, flue gas was sampled simultaneously before and after particulate control devices (electrostatic precipitator and fabric filter baghouse) along with the pulverized coal, bottom ash and fly ash sampling. The amount of oxidized mercury in gas phase before and after ESP/FF suggests that mercury oxidation after combustion is a kinetically controlled process. The comparison of mercury speciation in different power plant indicates a clear relationship with coal type, especially the chlorine concentration and the basic ash compositions in coal. Both of the factors are analyzed quantitatively in this study. A new parameter C (ratio of chlorine in coal to base/acid ratio) has been introduced to evaluate the co-effect of the two factors above on mercury speciation.