Synthesis and characterisation of gel-derived mullite precursors from rice husk silica

The sol–gel synthesis and characterization of mullite precursor derived from rice husk silica and aluminum nitrate hydrate [(Al(NO₃)₃·9H₂O] has been investigated. The samples were characterized using Fourier transform infrared (FTIR) spectroscopy, X-ray diffraction (XRD) coupled with Rietveld analysis, and scanning electron microscopy (SEM). FTIR results showed the presence of Si–O–Si, Al–O–Al, and Si–O–Al functional groups, which were associated with mullite, corundum, quartz, and cristobalite, as verified by XRD analysis. It is concluded that mullite formation started at 1150 °C, and its abundance increased rapidly with an increase in temperature from 1150 to 1350 °C, resulting in increased phase content from 30.9 to 67.7 wt%. Although mullite was formed at a low temperature, the complete reaction between corundum and silica to form mullite was not achieved. This finding demonstrated that rice husk silica is a potential alternative raw material for the production of mullite ceramic.     

以点带面，共同发展——测试中心做好校内实验技术人员培训的探索

本文论述中山大学测试中心在做好自身测试服务、自身建设的前提下,为进一步加强和提高全校实验技术队伍的整体素质水平,促进实验室规范化管理,率先在校内开展全校实验技术人员技能培训和实验室间比对活动。这是一项在高校中进行的具有开创性的工作,是学校测试中心以资质认定（计量认证）所要求的实验室规范管理为切入点,搞好校内各院系大型贵重仪器管理、培训和校准,逐步完善校内实验室间能力比对机制,是有效提高全校日益增多的贵重仪器设备管理水平和使用效益的非常有意义的工作。     

攀钢西昌分公司28m~3高炉全焦生产煤气试验

通过对 2 8m3高炉进行全焦生产煤气的试验 ,得出高炉全焦生产煤气在工艺上是可行的     

集成QFD/TRIZ/AHP的适老化钢制衣柜设计研究及应用

为提高钢制材料在老年人家具领域的可发展性以及准确地为老年人在钢制家具产品的互动上提供良好的体验,运用层次分析法(AHP)来确定客户的需求权重,通过功能质量展开法(QFD)发掘出客户的核心需求,从(TRIZ)发明问题解决理论的40条发明原理中,寻找最佳解决方法.在老年人钢制衣柜创新设计流程引入了QFD、AHP和TRIZ相结合的分析方法,主要从用户需求、设计指标决策及解决方案的角度阐述理论的应用方式,形成符合老年人用户需求的钢制衣柜产品,设计过程科学性的进一步提高,可为同类老年人钢制家具产品的创新设计提供有效参考.     

Bi4Ti3O12 modified low voltage ZnO-based varistors: microstructure, electrical properties and aging characteristics

The effects of Bi₄Ti₃O₁₂ addition on the microstructure, electrical properties and aging characteristics of ZnO-based varistors were investigated. The addition of Bi₄Ti₃O₁₂ can reduce the formation of Zn₂TiO₄ spinel phase and promote the growth of ZnO grain. Bi₄Ti₃O₁₂ doped ZnO-based varistors sintered at 1,130 °C possessed excellent performance of I _L = 2.9 μA, E _1mA = 29.7 V/mm, α = 30.2, and good surge absorption capability with %△E _1mA = ?3.5 % for 500 A 8/20 μs impulse current. In addition, the varistors exhibited the most stable accelerated aging characteristics with %△E _1mA = ?0.3 % for DC accelerated aging stress of 125 °C/7 h. These results revealed that Bi₄Ti₃O₁₂ addition is highly beneficial to attain enhanced varistor properties of ZnO ceramics.     

Adding phonetic similarity data to a lexical database

As part of a project to construct an interactive program which would encourage children to play with language by building jokes, we developed a lexical database, starting from WordNet. To the existing information about part of speech, synonymy, hyponymy, etc., we have added phonetic representations and phonetic similarity ratings for pairs of words/phrases.

Generating binary Bernoulli sequences based on a class ofeven-symmetric chaotic maps

If an even-symmetric chaotic map has a unique invariant measure density that is also even-symmetric, its generated analog signal sequences can be quantized into binary Bernoulli sequences by a certain symmetric binary function. This case includes some well-known chaotic maps, and the requirement of “equidistributivity property” is not necessary     

一种油田压裂用耐高温聚合物增稠剂 PAS-1研制

为配制热稳定性优良的压裂液, 以丙烯酰胺、 丙烯酸为骨架单体, 磺酸基单体、 阳离子单体、 亲水长链单体为功能单体合成了一种可以用于地层温度在 200℃以上的压裂液增稠剂 PAS-1。通过研究单体比例及其他反应条件对增稠剂性能的影响确定了 PAS-1最佳合成条件, 通过红外光谱和核磁共振氢谱表征了其分子结构, 并评价了其作为压裂液增稠剂 PAS-1的主要性能。研究结果表明： 增稠剂 PAS-1的最佳合成条件为： 单体 AM、 AA、PSN、 APEG、 DMDAAC 摩尔比 4.5∶2.5∶0.80∶0.0040∶0.18, 引发剂过硫酸铵用量为单体总质量 0.8%, 引发温度40℃下反应 30 min 后在 60℃下保温反应 24 h。增稠剂 PAS-1高分子本身在 300℃以内具有较好的热稳定性, 增稠剂 PAS-1还具有较强的增黏能力, 质量分数 0.6%的 PAS-1溶液黏度达 43.7 mPa·s。1.0%增稠剂 PAS-1基液中加入 0.6%有机钛锆复合交联剂 SJ66, 支撑剂沉降速率为 0.095 mm/min, 表明合成的增稠剂配制的压裂液交联体系具有优良的悬砂性能。1%增稠剂 PAS-1+0.6%有机钛锆复合交联剂 SJ66的压裂液具有较好的耐温抗剪切能力, 在温度 200℃、 剪切速率 170 s^-1下剪切 2 h后的压裂液黏度保留值在 50 mPa· s以上, 可满足高温压裂液的施工性能要求。图8表6参12