浅谈桥面防水层施工质量控制

结合山西汾(阳)￣离(石)高速公路桥面铺装防水层的施工,简介了桥面防水层的施工概况,总结了桥面防水层施工质量控制方法,为我国高速公路桥面防水层的施工提供一定的参考依据。     

Design of unknown input observer with H∞ performance for linear time-delay systems

A unknown input observer (UIO) design for a class of linear time-delay systems when the observer error can't completely decouple from unknown input is dealt with. A sufficient condition to its existence is presented based on Lyapunov stability method. Design problem of the proposed observer is formulated in term of linear matrix inequalities. Two design problems of the observer with internal delay and without internal delay are formulated. Based on H∞ control theory in time-delay systems, the proposed observer is designed in term of linear matrix inequalities (LMI). A design algorithm is proposed. The effective of the proposed approach is illustrated by a numerical example.     

Effect of Electrospark Alloying Process on Microstructure and Properties of the coating

Using electrospark alloying machine, a series of experiments were carried out to investigate the effect of electrospark surface strengthening process on the microstructure and the properties of the coatings with ultrafine cemented carbide as electrode material and white cast iron as substrate material. The results indicated that the optimum process parameters to be used reached a satisfying coating surface. Wear test results showed the coatings had a high wear-resistance.     

城市生活垃圾对扬尘污染的影响及其防治措施

通过对太原市城市生活垃圾产生，收集，运输及处理处置状况的调查，分析了城市生活垃圾收集，运输，处理处置过程对大气中颗粒物浓度的影响，提出了若干防治措施。     

Somatic variation in micropropagated clones ofCichorium intybus

Summary An experiment aiming to establish whether temporary or persistet somatic variation can arise in clones obtained in vitro by micropropagation has been performed onCichorium intybus. The results point out that persistent modifications of the phenotype can be observed after six cycles of cloning and that when the length of the cloning period is varied these appear to be differential responses of the same genotype to the micropropagation.     

无溶剂体系中蛋白酶催化氨基酸糖酯合成研究

研究了在无溶剂体系中Α-糜蛋白酶催化N-BOC-L-苯丙氨酸乙酯与D-葡萄糖的酯交换反应,考察了水含量、反应时间、搅拌以及底物摩尔比等因素对酯交换反应的影响。结果表明是在6位伯羟基(6-OH)进行定位酰化。生成的氨基酸葡萄糖酯可通过HPLC-UV定量检测,最适条件下的反应转化率达到90%以上。LC-MS分离并初步定性分析,产物相对分子质量为445,与理论目标产物的一致。     

工程制图课双语教学的几点思考

随着我国世界贸易组织的加入，对专业人才的需求也在提高，在高等学校中开展双语教学已是大势所趋。如何就工程图学科开展双语教学，本从教学模式、教学方法等诸方面进行了探析。     

胰岛素缓控释制剂的研究进展

糖尿病是目前患病率较高的疾病,皮下注射胰岛素是治疗糖尿病的主要方法.天然胰岛素属于多肽蛋白类药物,体内半衰期较短,维持长时间的稳态血药浓度,需要频繁给药,患者的顺应性低.将胰岛素包封在生物相容性好的材料中制成微球或原位植入系统,可在注射部位缓慢持续释放胰岛素,减少注射给药的次数,增加患者的依从性.分析了目前胰岛素注射缓控释制剂的设计思路及相关研究进展.     

一种大功率连续波磁控管的高频电磁场与热应力场耦合分析

本文发展一种应用于大功率连续波磁控管腔体的高频电磁场-热应力场耦合分析方法。首先,采用等效电路理论与数值仿真方法研究一种大功率连续波磁控管谐振系统在无隔模带、单环隔模带和双环隔模带情形下的工作模式、谐振频率和品质因数的内在关系;其次,对扇形和扇槽形阳极叶片的温度分布进行理论推导。研究发现,隔模带能够提高谐振系统的模式分隔能力,但也会增大损耗、降低品质因数;再者,通过对比不同冷却条件下谐振系统的热应力、形变、温度和谐振频率,设计出满足30kW连续波输出磁控管散热的冷却水路和相匹配的冷却条件;最后,结合二者得到阳极叶片温度与π工作模式谐振频率间的对应关系并给出磁控管的热漂移曲线。     

CO2地质封存过程中传热特性研究

碳捕集与封存(CCS)技术使得大规模减少CO2排放变得可行,充分预测CO2的状态对于实际工程安全有效开展是十分必要的．现有模型普遍将本应为整体系统的井筒注入和咸水层封存视为两个单独的阶段,通过建立一个井筒注入与咸水层封存的联合模型对储层中流体传热过程进行模拟,分析不同注入条件对于CO2在整体封存过程中传热特性的影响．研究表明,焦耳-汤姆孙效应、地层温度及井筒热阻是影响流体温度的主要原因,流体温度会影响冷却域范围以及最低温度出现的径向位置,高温或低压注入会抑制焦耳-汤姆孙效应．