用于集成电路软封装黑胶的研制

本文采用双酚A或双酚F型环氧树脂、胺类固化剂，改性叔胺固化促进剂，阻燃性填料配制成软片装黑胶—FZ—101黑胶，进行了固化温度和时间以及贮存期等试验，同时于美国同类产品HysolE01016胶进行比较．     

对煤磨MDC89-7袋式除尘器的节能环保改造

0 前言 湖南韶峰水泥集团有限公司规格为φ2.5 m×3.9 m的风扫式煤磨配套的MDC89-7袋式除尘器于1993年投用,经十多年的生产应用,其导流板及风道损坏达80%左右;外壳、主风道因烧袋和腐蚀,严重变形且花板变得很薄;反吹风道变形穿孔,提升阀密封不严,导致清灰时风量流失严重,运行阻力增加,系统产量降低,且系统中含氧量增加,带来安全隐患;除尘效率下降、污染严重,粉尘排放浓度高达1 g/m3;系统能耗高,且维修强度大(每个滤袋重50kg,每次换袋需12人)且费用高.为此,该公司于2004年4月对该煤磨除尘器进行技术改造,取得了明显的效果.     

Classification of defects in steel strip surface based on multiclass support vector machine

In this paper, we use support vector machine to classify the defects in steel strip surface images. After image binarization, three types of image features, including geometric feature, grayscale feature and shape feature, are extracted by combining the defect target image and its corresponding binary image. For the classification model based on support vector machine, we utilize Gauss radial basis as the kernel function, determine model parameters by cross-validation and employ one-versus-one method for multiclass classifier. Experiment results show that support vector machine model outperforms the traditional classification model based on back-propagation neural network in average classification accuracy.     

准同型相界附近(Na1-xKx)0.5Bi0.5TiO3的制备及性能研究

利用固相法制备了（Na1-xKx）0.5Bi0.5TiO3系压电陶瓷，XRD分析表明所得陶瓷样品为纯的钙钛矿结构，其准同型相界在x=0．18～0．22之间；电子探针显微分析显示所做陶瓷样品晶粒发育良好，具有规则的外形和明显的晶界；实验所得陶瓷样品损耗tanδ最大不超过5％，最好的压电常数d33=153 pC／N，平面机电耦合系数kp=0．299，它们分别出现在x=0．22和0．20处。     

铁铵矾为催化剂对合成乙酸仲丁酯的影响研究

以铁铵矾为催化剂,对冰乙酸与仲丁醇之间的酯化反应进行了研究,考察了催化剂用量、酸醇摩尔比、反应时间对合成乙酸仲丁酯的影响,结果表明:铁铵矾有一定催化活性。当冰乙酸物质的量为0.12mol,冰乙酸、仲丁醇及铁铵矾的摩尔比为1∶2∶0.12,催化剂质量为7.0g,反应2.5h后,收率可达75.12%,所得产品无色透明。     

微生物发酵生产2,3-丁二酮的研究

2,3-丁二酮又称双乙酰,是一种黄色至浅绿色具有强烈奶油香味的重要香料。2,3-丁二酮传统上用合成法生产,我们以农副产品为主要原料,利用选育的高产菌株发酵生产,发酵工艺条件温和,产品风味自然、逼真、安全性高,视同天然产品,符合人们崇尚自然的趋势,可广泛用于食品、日化、饲料香精的生产。     

山苍子油在合成香料中的应用

简介近十几年来从山苍子油中柠檬醛出发合成的有关香料，并对有发展前景和应用前景的紫罗兰酮类、大马酮类和环高柠檬醛等香料的合成方法作一评述。     

磁性漆酚缩甲醛微球的制备与表征

在共沉淀法合成磁流体的基础上,用悬浮缩聚法制备了磁性漆酚缩甲醛微球,并用X射线粉末衍射、透射电镜和热重分析等对微球进行结构表征。实验结果表明,Fe3O4磁流体的粒径为纳米量级,纳米Fe3O4粒子能够提高复合物的热性能。该微球粒径约1mm,是核壳结构,具有良好的耐溶剂性和耐热性。     

Particle size distribution,mixing behavior,and mechanical properties of carbon black (high‐abrasion furnace)–filled powdered styrene butadiene rubber

High‐abrasion furnace black (HAF, grade N330)–filled powdered styrene butadiene rubber [P(SBR/HAF)] was prepared and the particle size distribution, mixing behavior in a laboratory mixer, and mechanical properties of P(SBR/HAF) were studied. A carbon black–rubber latex coagulation method was developed for preparing carbon black–filled free‐flowing, noncontact staining SBR powders, with particle diameter less than 0.9 mm, under the following conditions: carbon black content > 40 phr, emulsifier/carbon black ratio > 0.02, and coating resin content > 2.5 phr. Over the experimental range, the mixing torque τ_α of P(SBR/HAF) was not as sensitive to carbon black content and mixing temperature as that of HAF‐filled bale SBR (SBR/HAF), whereas the temperature build‐up ΔT showed little dependency on carbon black content. Compared with SBR/HAF, P(SBR/HAF) showed a 20–30% mixing energy reduction with high carbon black content (>30 phr), which confers to powdered SBR good prospects for internal mixing. Carbon black and the rubber matrix formed a macroscopic homogenization in P(SBR/HAF), and the incorporation step is not obvious in the internal mixing processing results in these special mixing behaviors of P(SBR/HAF). A novel mixing model of carbon black–filled powdered rubber, during the mixing process in an internal mixer, was proposed based on the special mixing behaviors. P(SBR/HAF) vulcanizate showed better mechanical properties than those of SBR/HAF, dependent primarily on the absence of free carbon black and a fine dispersion of filler on the rubber matrix attributed to the proper preparation conditions of noncontact staining carbon black–filled powdered SBR. © 2004 Wiley Periodicals, Inc. J Appl Polym Sci 94: 2494–2508, 2004     

浅谈皮带定量给料机的机械配置选型

皮带定量给料机是目前水泥生产企业中最为常见的过程计量和配料的设备。作者结合多年来开发、调试和使用皮带定量给料机的实践经验与资料积累，介绍了如何根据实际需要和使用量程，通过对皮带定量给料机的主要机械参数的计算来合理地选用定量给料机的型号和规格。