污染物在非饱和土壤中迁移规律的试验研究

借助于土柱物理模型装置，试验研究了保守性污染物在非饱和土壤中的迁移规律，得到了污染物瞬时输入和连续输入条件下，非饱和土壤中污染物浓度时空变化的过程。在分析实测资料的基础上，提出了采用考虑可动水体与不可动水体因素的数学模型来描述土柱内污染物的迁移过程。根据实测资料和数学模型的数值解，运用最优化技术率定模型参数，得到了具有应用价值的参数成果。     

催化缩聚法制备萘沥青和中间相沥青

萘在催化剂作用下经非脱氢聚合，结构中含有大量环烷结构和脂肪侧链，以萘沥青为原料可制备出低软化点、低粘度、高可熔性、高产率的中间相沥青。     

一类低截获概率距离高分辨力信号

介绍了一种由脉间科斯塔频率编码(PCFC)信号实现距离高分辨力的方法。使用信号模糊图呈图钉形,具有低截获概率(LPI)特性。采用合成处理方法处理结果对系统带宽限制具有不敏感性。     

正常豚鼠听觉脑干诱发反应(ABR)的研究

本文记录和分析了110只正常豚鼠的ABR,在85dBSPL短声(click)刺激后,在豚鼠(户页)顶可引得的ABR由Ⅰ～Ⅴ波组成。随着强强刺激降低引得的ABR波数减少,各波出现率也降低,其中波幅最大、最稳、最后消失的是Ⅲ波,依次为Ⅰ、Ⅳ、Ⅱ和Ⅴ。豚鼠听阈值在25～10dBSPL左右。豚鼠ABR各波潜伏期和波间期恒定,但是它的ABR波幅个体差异较大。疏密短声引得的ABR的波形、波幅及各波潜伏期和各波间期有变化。     

冷挤压工序设计的专家系统

冷挤压成形工序设计(或称过程规划)通常是由经验丰富的模具设计人员依靠已有的设计和工艺规则及其经验进行的。本文介绍一种利用专家系统来自动产生可行工序的方法,系统建造利用Turbo Prolog在微机上进行。     

Linking leach chemistry and microbiology of low-grade copper ore bioleaching at different temperatures

The effects of temperature on chalcocite/pyrite oxidation and the microbial population in the bioleaching columns of a low-grade chalcocite ore were investigated in this study. Raffinate from the industrial bioleaching heap was used as an irrigation solution for columns operated at 20, 30, 45, and 60℃. The dissolution of copper and iron were investigated during the bioleaching processes, and the microbial community was revealed by using a high-throughput sequencing method. The genera of Ferroplasma, Acidithiobacillus, Leptospirillum, Acidiplasma, and Sulfobacillus dominated the microbial community, and the column at a higher temperature favored the growth of moderate thermophiles. Even though microbial abundance and activity were highest at 30℃, the column at a higher temperature achieved a much higher Cu leaching efficiency and recovery, which suggested that the promotion of chemical oxidation by elevated temperature dominated the dissolution of Cu. The highest pyrite oxidation percentage was detected at 45℃. Higher temperature resulted in precipitation of jarosite in columns, especially at 60℃. The results gave implications to the optimization of heap bioleaching of secondary copper sulfide in both enhanced chalcocite leaching and acid/iron balance, from the perspective of leaching temperature and affected microbial community and activity.     

谷胱甘肽-铜极谱络合吸附波的研究

在铜离子存在下,谷胱甘肽(GSH)在0.2mol/LNaAc-HAc(pH4.7)缓冲溶液中,与铜离子反应得到谷胱甘肽(GSH)与一价铜离子络合物,在单扫示波极谱上产生一灵敏的络合吸附波,峰电位在-0.59V处(vs.SCE),导数波高与谷胱甘肽浓度在4.0×10-8mol/L～1.0×10-5mol/L范围内分段成线性关系,检测限为1.0×10-8mol/L,相对标准偏差3.3%。研究了极谱波的性质,测得络合物组成为GSH:Cu(Ⅰ)=1:1,表观稳定常数为5.1×1019。     

Research on the integration of Web_-CNC and EIS

1.INTRODUCTION Withthedevelopmentofcomputerandnetwork,the competitionofmarketbecomingincreasinglyserious,andtherequirementofcustomerschangingfaster,enterprisecannotadaptitselftothemarketdemand withthetraditionalmanagingmode.Inordertosuc ceedinmarket,enterprisemustreacttothemarket agilely,andmustbuildnetworkedmanufacturing modebasedontheT(time),Q(quality),C(cost),S(service),E(environment),andK(knowl edge)[1,2].Atpresent,enterprisestrengthenstheagility throughimplementingERP(enterprisere…     

中国奥林匹克教育之刍议

本文采用文献资料和逻辑分析等方法阐释了奥林匹克教育渊源和内涵、奥林匹克教育的内容和对象,分析了中国奥林匹克教育的现状和存在的问题,并试图以2008年北京奥运会为契机,为推动奥林匹克教育在中国广泛深入地开展和普及提出建议。     

李雅普诺夫泛函与具时滞的非线性系统的解的渐近性

得到了具时滞的非线性微分方程系统的渐近性的一些结果，所用的方法是构造李雅普诺夫泛函数持久性泛函。得到的结果将不依赖于时滞的大小。