中温锌系磷化膜及皂化膜的组织结构研究

为深入研究磷化皂化润滑机理及改进磷化皂化工艺,利用扫描电镜(SEM)、电子探针(EPMA)、X射线衍射(XRD)等手段对中温锌系磷化膜及硬脂酸钠皂化膜的表面形貌、截面形貌、组织结构以及成分组成进行了研究.结果表明:中温锌系磷化膜主要以磷酸锌(H膜)为主,并有少量磷酸锌铁(P膜),磷化膜表面有棒状和球状两种形貌结构,磷化膜厚度约为20μm.经过皂化后膜层分为磷酸锌、硬脂酸锌和硬脂酸钠三层,硬脂酸锌和硬脂酸钠具有很好的润滑效果,皂化膜表面为棉絮状形貌.     

镍黄铁矿单矿物的中等嗜热菌浸出

使用中等嗜热菌S .t浸出镍黄铁矿单矿物。结果表明 ,在酸性溶液中 ,镍黄铁矿自发氧化分解 ,8d镍浸出率仅12 48% ,加入细菌 ,镍浸出率达 44 41% ,添加酵母提取物后镍浸出率提高到 63 67%。S .t浸出镍黄铁矿单矿物最适 pH值 2 0左右 ,接种量以 5 %～ 10 %为宜 ,酵母提取物最适添加量为 0 0 2 %。     

Zhang Guoqing, Feng Xingmei, Feng Zhanying, Tang Chao, Wang Feng and Qi Yuefeng Effect of mixed rare earth and Sr on microstructure and brazability of Al-20Cu-5Si-2Ni filler metal

The objective of this study is to investigate the influence of adding tiny amount of mixed rare earth ( La, Ce) and Sr to Al-20Cu-5Si-2Ni filler metal, by analyzing the microstructure, wettability and mechanical properties of brazed joints. The results show that with the addition of mixed rare earth ( La, Ce) into Al-20Cu-5Si-2Ni alloy, the α-Al solid solution as well as CuAl₂ ( Ni) intermetallic compound phase significantly reduced, while more Al-Si eutectic phase and Al-Si-Cu ternary eutectic phase were produced. And as mixed rare earth ( La, Ce) added in, the wettability of Al-20Cu-5Si-2Ni filler metal decreased, while the shear strength of the brazed joints increased. The addition of Minor Sr modificated Al 20Cu-5Si-2Ni filler metal, further reduced the CuAl₂ ( Ni) intermetallic compound phase, which was partially replaced Al-Si-Cu ternary eutectic phase. As a result, the tensile strength as well as the wettability of the filler metal was improved.     

中低温固体氧化物燃料电池(SOFC)电解质材料

在固体氧化物燃料电池（ＳＯＦＣ）研究中，中低温ＳＯＦＣ的研究日益受到人们的重视，研究热点主要集中在电解质材料及其薄膜制备，主要包括锆基电解质薄膜（１～２０μｍ），铈基电解质，铋基电解质以及复合氧化物电解质材料的研究，其ＳＯＦＣ操作温度一般在５００～８００℃。其中以各种掺杂铈基电解质研究最多，而且在中低温ＳＯＦＣ应用中已显示出一定的潜在优势。     

CO2稀释对甲烷高温低氧条件下自燃着火特性影响的数值模拟（英文）

Homogeneous mixtures of CH4/air under moderate or intense low-oxygen dilution(MILD) combustion conditions were numerically studied to clarify the fundamental effects of exhaust gas recirculation(EGR),espe-cially CO2 in EGR gases,on ignition characteristics.Specifically,effects of CO2 addition on autoignition delay time were emphasized at temperature between 1200 K and 1600 K for a wide range of the lean-to-rich equivalence ratio(0.2~2).The results showed that the ignition delay time increased with equivalence ratio or CO2 dilution ratio.Fur-thermore,ignition delay time was seen to be exponentially related with the reciprocal of initial temperature.Special concern was given to the chemical effects of CO2 on the ignition delay time.The enhancement of ignition delay time with CO2 addition can be mainly ascribed to the decrease of H,O and OH radicals.The predictions of tem-perature profiles and mole fractions of CO and CO2 were strongly related to the chemical effects of CO2.A single ignition time correlation was obtained in form of Arrhenius-type for the entire range of conditions as a function of temperature,CH4 mole fraction and O2 mole fraction.This correlation could successfully capture the complex be-haviors of ignition of CH4/air/CO2 mixture.The results can be applied to MILD combustion as "reference time",for example,to predict ignition delay time in turbulent reacting flow.     

考虑地基耦合效应时含裂纹中厚矩形板的自由振动分析

基于Hamilton变分原理,考虑板的横向剪切变形和地基耦合效应,建立了双参数地基上含横向表面贯通裂纹的中厚矩形板的运动控制方程。构造了满足边界条件及裂纹处连续条件的挠度函数,然后应用伽辽金方法进行求解。算例中,讨论了裂纹位置和深度的变化对弹性地基上四边自由中厚矩形板的自由振动特性的影响。     

有机酸改性咪唑环氧树脂固化促进剂的研究

二氰二胺作为环氧树脂的潜伏性固化剂,其固化物机械性能和介电性能优异。但由于二氰二胺与环氧树脂相溶性差,得不到均匀的组成物,且环氧树脂/二氰二胺体系的固化过程需在高于160℃的温度中进行。利用不同含量的有机酸与咪唑3位氮原子中和,改性生成的盐作为环氧树脂/二氰二胺体系固化促进剂,对该体系进行了改进,使其能够在中温(90～120℃)条件下固化。利用IR对改性产物进行了表征,并对未加促进剂的环氧树脂/双氰胺体系和以咪唑及有机酸改性咪唑为促进剂三种体系分别进行了差热分析。结果表明,有机酸改性咪唑促进剂可以使环氧树脂/二氰二胺体系的固化温度降低近50℃,并且适用期显著增加,长达141d,耐水性和耐热老化性能增加。     

湖北某难处理金精矿中温菌预氧化-氰化浸出试验研究

研究了用中温菌预氧化-氰化浸出湖北某难浸金精矿.湖北某难浸金精矿为微细浸染状,高砷、高硫,含碳、汞、锑,采用中温菌对其进行预氧化,然后进行摇瓶与半连续氰化浸出试验.矿浆浓度15%,摇瓶试验中细菌预氧化10 d,半连续试验中细菌预氧化时间6～7 d.氰化浸出时,NaCN用量6 kg/t,液固体积质量比2∶1,浸出时间24 h.结果表明,金氰化浸出率分别为80.32%和86.32%.     

混合菌株和外源赖氨酸对鱼酱发酵品质的影响

研究中度嗜盐菌混合菌株及外源赖氨酸对鱼酱发酵品质的影响。通过对pH值、总酸、氨基酸态氮、挥发性盐基氮、游离氨基酸、挥发性风味物质分析及感官评定,探讨发酵60 d混合菌株（Halobacillus campisalis、Halobacillus faecis、Bacillus aquimaris、Bacillus hwajinpoensis）和外源赖氨酸对鱼酱品质的影响。以鮰鱼碎鱼肉为原料,4 种处理：第1组只添加15%食盐（鱼酱a）,第2组添加15%食盐和0.1%赖氨酸（鱼酱b）,第3组添加15%食盐和混合发酵剂（鱼酱c）,第4组添加15%食盐、0.1%赖氨酸和混合发酵剂（鱼酱d）。结果表明：发酵60 d时,4 组不同处理鱼酱的总酸质量分数分别为0.382 5%、0.63%、0.607 5%和0.585%,与鱼酱a相比,鱼酱b、c、d均能显著提高总酸含量（P＜0.05）;与鱼酱a相比,鱼酱c中的氨基酸态氮含量无显著变化（P＞0.05）,鱼酱b和d中的氨基酸态氮含量显著上升（P＜0.05）;与鱼酱a相比,b、c和d三组鱼酱的挥发性盐基氮含量显著下降（P＜0.05）,氨基酸的种类和含量更加丰富,挥发性风味物质更加丰富,鱼酱的感官评分和风味更好。     

加大技术改造力度 增加企业经济效益

新陆煤矿选煤厂,通过对洗中块生产工艺的多次技术改造和加强质量管理,保证了洗中块质量,提高了洗中块批灰分的稳定率,从而达到了提高吨煤洗中块产率的目的,获得了较好的经济效益。