Fe(Ⅲ)改性膨润土光催化降解水溶液中的4-氯苯酚

以Fe（Ⅲ）离子交换改性膨润土,制得一种多相Fenton催化剂;以4-氯苯酚为模型污染物,研究不同反应条件的影响。结果表明,复合催化剂主要含SiO2及α-Fe2O3两种晶型,Fe是以高催化活性的α-Fe2O3形式存在。复合催化剂在H2O2及紫外光的协同作用下,经60 min反应后对4-氯苯酚的降解率约100%,TOC去除率约70%,且其循环使用性能较好。在实际操作过程中,控制溶液体系的pH值为6以及H2O2与4-氯苯酚浓度比约15较为适宜;在4-氯苯酚的降解过程中,C—Cl键持续断裂,Cl-被释放出来,降解过程生成了一些不含氯的中间产物。     

（反应）模晶生长法制备NBT-6BT织构陶瓷的研究

以熔盐法合成的片状SrTiO3，Bi4Ti3O12为种晶，分别采用模晶生长法（TGG）和反应模晶生长发（RTGG）制备了具有〈001〉取向的0．94（Na1/2Bi1／2）TiO3-0．06BaTiO3（NBT-6BT）织构陶瓷。研究了不同种晶选择、流延和热处理工艺参数对陶瓷织构化程度、显微结构和压电性能的影响。结果表明，RTGG制备的织构陶瓷比TGG的在结构和性能等方面都具有优势，且用该方法以Bi4Ti3O12为种晶，制备出了高密度（f≥96％）、高织构度（F≈95％）、高性能（d33≈241pC／N）的NBT-6BT无铅压电陶瓷。     

消失模铸造充型过程的模拟方法

通过分析消失模铸造充型过程的特点，提出了一种消失模铸造充型过程的计算模型，并用人工神经网络算法计算了充型过程中不同时刻液态金属-模样界面的位置．模拟计算结果与实际测试结果无论在充型形态还是充型时间上都符合得较好．     

不同形貌Ga2O3纳米材料可控合成工艺研究

通过研究基片种类、加热温度、保温时间、冷却速度及是否加入催化剂等不同工艺参数对低维Ga2O3，纳米材料形貌的影响，确定出合成5种不同形貌β-Ga2O3纳米材料的工艺条件。场发射扫描电镜（FE-SEM）表明5种不同形貌α-Ga2O3纳米材料分别为纳米线、纳米棒、纳米带、纳米环及纳米片。X射线衍射（X-ray）分析结果表明不同形貌纳米材料均为晶格常数日=1．223nm，b=0．304nm，c=0．58nm，a=90°，β=103．7°，γ=90°的单斜晶系β-Ga2O3晶体。     

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...     

WC硬质合金颗粒复合耐磨材料的韧性与断裂

采用不同类型的WC硬质合金颗粒及不同成分的金属基本组成的两种复合耐磨材料，研究了复合材料的韧性及其影响因素，观察分析了其断口形貌及断裂机理．结果表明，复合材料的韧性与断面上WC硬质合金颗粒及金属基体的面积分数有关，主要取决于金属基体的成分、组织状态、韧性和含量，基体的韧性越好，含量越多，则复合材料的韧性越高．在冲击载荷作用下，WC硬质合金的断裂为脆性解理断裂，而金属基体则为具有少量塑性变形的准解理断裂。     

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.     

Synthesis of nano Sb-encapsulated pyrolytic polyacrylonitrile composite for anode material in lithium secondary batteries

A novel process was proposed to synthesize nano Sb-encapsulated pyrolytic polyacrylonitrile composite for anode material in lithium secondary batteries. The preparation started with the dissolution of SbCl₃ and polyacrylonitrile (PAN) in dimethylformamide (DMF) solution, followed by the addition of KBH₄ to reduce Sb³⁺ in the solution. The Sb composite was obtained by pyrolysis of the Sb/PAN mixture that precipitated out when the DMF solution was added by plentiful water. The TEM analysis showed that about 100-200 nm Sb particles were embedded by the pyrolyzed PAN, which provided a conductive matrix to relieve the morphological change of Sb during electrochemical cycling. As-prepared composite presented good cycleability for lithium storage. The proposed process paves an effective way to prepare high performance alloy based composite anode materials for high performance lithium-ion batteries.     

Electron Emission from Barium Strontium Titanate Ceramics

This paper focuses on understanding the influence of materials' properties on the ferroelectric electron emission. Ferroelectric ( x =1.0 and 0.8) and paraelectric ( x =0.67 and 0.5) compositions of barium strontium titanate (Ba _x Sr_{(1− x )}TiO₃) system were chosen for study based on their different ferroelectric and dielectric properties. Similar emission current waveforms were obtained from four compositions with negative triggering voltage applied to the rear electrode of the samples. It was difficult to explain the experimental results using the spontaneous polarization-switching model. The mechanism of electron emission from Ba _x Sr_{(1− x )}TiO₃ ceramics was ascertained to surface plasma emission.