新型吸-放热复合发泡剂的特性分析与应用

对自制的新型吸－放热复合发泡剂ＨＣＢ－ＮＸ的分解动力学和热力学特性进行了研究,同时对采用该发泡剂进行硬质聚氯乙烯低发泡挤出的特性及泡孔结构进行了分析。     

The effect of intermetallic hydrogen acceptor on catalytic aromatization of propane

The effect of the hydride-forming intermetallic compound Zr₂Fe on the aromatization of propane over high-silica zeolites of CVM type (Russian equivalent of ZSM-5) modified by Zn, Ga or Pt cations has been investigated. Aromatics yield and selectivity of aromatization are shown to increase essentially as a result of releasing hydrogen elimination by the intermetallic acceptor. The effect of hydrogen acceptor on propane conversion and product distribution appeared to be different depending on the composition of the catalyst used. Possible changes in the reaction mechanism in hydrogen removal conditions are discussed.     

Molecular association complex of urea with polyethylene: 3. Structural studies of the complex

The crystal structure of urea-polyethylene complex in the hexagonal form, obtained by one of our preparation methods, is analysed by X-ray power diffractometry. In this analysis, the fixed molecular parameters of urea are used, and three models with respect to rotational disorder of the guest polyethylene molecule are assumed. It is shown that the host lattice structure constructed by urea molecules is essentially the same as that of urea-n-paraffin complex. Effects of the disorder structure of the guest on X-ray scattering of the complex are presented. However, there is a difficulty in identifying the disorder structure by X-ray analysis. With the aid of a potential energy calculation between the hexagonal urea tunnel and the guest molecule, a rotational disorder model is preferred.     

过渡金属的液晶基元配合物纳米胶束的自组装

以异烟酸和溴代十二烷为原料合成液晶基元异烟酸十二烷基酯,在水和无水乙醇混合反应体系中,室温下分别与Pd(Ⅱ)、Cu(Ⅱ)和Ni(Ⅱ)过渡金属按4∶1的摩尔比混合反应,通过自组装形成配合物。透射电镜形态观测表明,配合物之间借助超分子力和配体的液晶性协同作用构建成25～40nm左右的棒状形态的纳米胶束。并利用红外光谱,紫外可见吸收光谱,荧光光谱等手段对其结构和性质进行了表征。     

盐酸法饲料磷酸盐生产中应用氯化钾（氯化钠）、碳酸钙复合脱氟剂的研究

对贵州开阳磷矿用盐酸法生产饲料级磷酸氢钙的生产工艺,应用氯化钾(氯化钠)、碳酸钙复合脱氟剂进行了实验研究,得出了用复合脱氟剂脱氟的操作控制要点。实验数据表明:在一定的条件下,复合脱氟剂脱氟工艺所得的溶液和成品均合格,矿粉和盐酸的单耗均有所降低,分别为1.554t和2.644t。     

葡甘聚糖改性大豆蛋白作为药物乳化剂的研究

用天然大豆蛋白和葡甘聚糖,利用羟氨反应使蛋白质分子的侧链氨基与多糖分子的末端不饱和羰基反应生成稳定的共价键,进而形成以多羟基葡甘聚糖为亲水基,大豆蛋白为疏水基的新型两亲分子。结果表明,葡甘聚糖改性大豆蛋白是良好的药用乳化剂,制成的O/W乳状液稳定性明显优于Tween-60制成的乳状液。     

HPLC测定复方氯己定甲硝唑栓中醋酸氯己定、甲硝唑的含量

建立复方氯己定甲硝唑栓中主要成分醋酸氯己定、甲硝唑含量的高效液相色谱测定方法。色谱柱为大连依利特公司HypersilC18柱(20cm×4.6mm,10μm);醋酸盐缓冲溶液(取醋酸铵80g、辛烷磺酸钠2g加水800mL溶解后,用冰醋酸调节pH值至4.2,加水至1000mL)—甲醇(40∶60)为流动相;检测波长:甲硝唑315nm,醋酸氯己定260nm。醋酸氯己定、甲硝唑的回收率分别为99.27%、99.40%,RSD分别为0.57%、0.55%(n=9)。该方法简便,结果准确可靠。     

焦炉加热过程模糊复合智能控制系统模型研究

采用"间歇加热控制"与加热煤气流量调节相结合的控制原理,利用模糊复合控制建立焦炉加热智能控制策略和模型.该控制策略采用前馈、反馈和模糊智能控制相结合,并应用结焦指数CI控制焦炉的炼焦过程.根据智能控制策略,设计了焦炉加热模糊智能控制的结构和模型.根据实际需要和人工经验,设计了焦炉加热的模糊控制器.仿真结果表明该系统能够稳定焦炉的炉温,具有很大的实用价值.     

有机磷化物制备羟基磷灰石工艺条件的探讨

探索用有机磷化物制备羟基磷灰石的工艺条件：采用硝酸钙、氨水、磷酸三丁酯为原料进行正交对比研究，优化得到了制备较佳羟基磷灰石的工艺条件。优化的工艺条件为：原料中Ca／P（molar ratio）1．67；Ca（NO3）2、4H2O／NH3H2O（g／g）为0.99；烧结温度为850℃：恒温时间为5h，并对合成的样品进行了化学和红外光谱的分析。     

A helical drive in-pipe robot based on compound planetary gearing

The modern society is fuelled by very comprehensive grids of gas and liquid pipelines. In recent years, various in-pipe robots have been developed for inspection and maintenance tasks inside such pipes. In this paper, a novel in-pipe robot is proposed and developed for gas/oil well interventions at thousands of meters downhole. Due to the nature of such intervention, in-pipe robot design must be capable of carrying a very large payload, as large as 2500?N inside a pipe with diameter as small as 54?mm. The proposed design concept is based on a compound planetary gearing system. One of the major novelties of this design is the use of pipe wall as a ring gear for one stage of the compound planetary gear system; the other novelty is the generation of helical angle when the planetary gears are expanded to press on the pipe wall. The proposed concept is compact, efficient, and has never been reported before. In this paper, the helical angle, the velocity, and load capability of the proposed system will be analyzed. The load transportation capability of the proposed robot is also measured based on an experiment. Initial data have shown great potential in carrying large payloads.