浅析GRC装饰件的使用

近几年来,国内高层建筑外装饰工程中有的使用了“GRC”装饰件,此种装饰件,从原材料到安装工艺尚无统一的国家标准,使用单位要引起足够的重视。本文就应用中的一些重要问题提出了分析,有关科研部门应对其进一步研究,以便推广使用。     

染料结合赖氨酸（DBL）法测定谷类籽粒中赖氨酸的含量

详细介绍了染料结合赖氨酸（DBL）法测定谷类籽粒中赖氨酸含量的分析方法，并求出标准曲线的相关系数及回归方程，分别为:r=0.9969,y=-0.6072 0.6621x。     

新型锂离子电池正极材料Li_3V_2(PO_4)_3改性研究进展

具有高能量密度、高电压平台、高稳定性、高安全性的新型锂离子二次电池正极材料Li3V2(PO4)3,近年来成为研究热点。综述了该材料具有电化学活性的单斜晶系的结构及其对应的电化学特性,并且重点介绍了该材料碳包覆、碳掺杂、金属离子掺杂等改性方法的最新研究进展,并对其实用化前景进行展望。     

制备条件对酸化膨润土负载镍催化剂苯加氢活性的影响

采用酸回流膨润土制备了酸化膨润土,并以其为载体制备了镍催化剂,以苯加氮为探针反应,考察了酸种类、回流时间及固液比对酸化膨润土负载镍催化剂对苯加氮反应的影响.当使用浓度为15%的盐酸、固液比为1:4、70℃下回流6h时,酸化膨润土负载镍催化剂在140℃下能将苯完全转化为环己烷.     

Study on ceria-modified SnO2 for CO and CH4 oxidation

Sn-Ce-O binary catalysts with different Sn/Ce molar ratios were prepared with co-precipitation method and applied for CO and CH4 oxidation. The catalysts were characterized by means of N2-BET, XRD and H2-TPR techniques. It was found that for those Sn rich samples such as SnCe91 and SnCe73, Ce cations were doped into the matrix of tetragonal rutile SnO2 to form SnO2 -based solid solution. As a consequence, the oxidation activity as well as the thermal stability was significantly improved compared with pure SnO2 . In contrast, for Ce rich samples such as SnCe19, SnCe37 and SnCe55, though the thermal stability was improved, the activity was worse than SnO2,due to the presence of much less amount of active oxygen species. Co-precipitation was found to be the best method to prepare Sn-Ce binary catalysts among all of the methods tried in this study.     

Ni/Y_2O3-Al2O3 catalysts for hydrogen production from steam reforming of ethanol at low temperature

Y2O3-Al2O3 with different mole ratios of Y:Al were prepared by co-precipitation method. Catalysts Ni/Y2O3, Ni/Al2O3 and Ni/ Y2O3-Al2O3 were prepared by impregnation method. The result of BET showed that Al2O3 with relative high surface area was in favor of Ni distribution, whilst the TPR test demonstrated that composite support had appropriate synergistic effect between active constituent and sup-port, and NiO could be reduced more easily than loaded on the single support. H2-TPD test indicated that the catalyst NYA11 had lots of ac-tivity sites where H could be desorbed easily, which led to hydrogen-rich production over the catalyst. Composite support catalysts exhibited high activity for ethanol steam reforming (SRE), and the supported catalyst with composite of 1:1 mole ratio of Y:Al exhibited the optimum catalytic properties for SRE. Ethanol could be completely converted over catalyst NYA11 even at 450 °C, and there had no inactivation after 60 h continuous reaction, hydrogen yield appeared maximum 35.9% at 400 °C, and tended to increase with increasing H2O/EtOH molar ratio and feed flow rate.     

阶梯溢流坝与二级消力池联合消能体型研究

阶梯溢流坝以其较高的消能率被广泛用于工程中,但对其深入的研究尚少。通过数值模拟计算结合模型试验的方法,研究溢流坝的过渡台阶组合以及两级消力池入池体型对于溢流坝流速、流态、消能率等水力特性的影响表明:过渡台阶组合与消力池入池体型对整体消能率影响较小,阶梯溢流坝入流端采用小尺寸逐渐过渡到均匀尺寸台阶的组合能有效调整入池流态,消力池入池端采用斜坡代替台阶调整入池下跌水流角度,可减少对于消力池底板的冲刷,证明采用入池斜坡的阶梯溢流坝与二级消力池联合消能具有良好的消能效果。     

雷达复杂环境下的群目标快速分辨方法

随着远程打击武器突防能力的不断提高,其在对特定目标的打击过程中形成的群目标环境越来越复杂。为了能够及早发现关键目标,达到快速发现拦截摧毁的目的,导弹预警系统对雷达太空态势感知能力的要求越来越高。基于此,针对远程打击武器飞行过程中的特点,结合雷达基本原理,对影响雷达分辨能力的关键参数进行了简要分析,提出了基于背景熵的群目标判断方法,分析了基于OS-CFAR的密集群目标检测原理方法,讨论了大小目标近距离情况下基于Clean算法的遮蔽目标检测技术。     

工业废水中汞的处理技术

某些生产过程产生的工业废水,含有有毒的汞及其化合物,本文对废水中各类汞的处理技术进行了总结,包括物理化学法和微生物法的工艺和机理,后者在处理含汞工业废水方面具有发展优势,具有较好的发展前景。     

硫酸酸化膨润土负载Au及Au—Ce催化剂的制备及其催化性能

采用硫酸对膨润土（Ben）进行改性处理,通过沉积-沉淀法（DP）制备活化后膨润土负载的金催化剂,以CO氧化作为探针反应对催化剂的催化性能进行研究。采用CTAB修饰载体表面并添加ce作为助剂制备Au—ce催化剂,并用BET、XRD、ICP和TPD等对催化剂进行了表征。结果表明：经过简单酸处理后的膨润土比表面积和孔体积有了大幅度的提高,质量分数30％的硫酸对膨润土的改性效果更好。以硫酸酸化膨润土作为载体,Au—ce复合催化剂相比Au催化剂性能有较大提高。