我国静电增强纤维除尘技术的研究现状

静电增强纤维除尘技术具有除尘效率高、压力损失小、过滤风速高的突出优点,是一种很有发展前途的新型除尘技术。根据静电增强方式的特征,本文对此技术进行了分类和综合分析,并回顾了静电增强纤维除尘技术在我国的发展过程及研究现状。     

氯化镁用于染料废水的脱色研究

研究了MgCl_2处理若干种类的活性染料及分散染料的脱色效果,比较了MgCl_2/Ca(OH)_2、Al_2(SO_4)_3.PAC、FeSO_4/Ca(OH)_2的脱色效果。探讨了MgCl_2的脱色机理。实验结果表明,MgCl_2的脱色效果与染料种类、脱色的pH条件,脱色剂的用量有关;MgCl_2的脱色率随pH值升高而增加,对于活性染料废水,当pH=12.5左右时脱色率达最佳;对于分散染料废水,pH=12.0左右时脱色率达最佳;MgCl_2/Ca(OH)_2的脱色效果优于 PAC、Al_2(SO_4)_3、FeSO_4/Ca(OH)_2的脱色效果;MgCl_2的脱色机理为:(1)Mg~(2+)能与含有—OH,—SO_3H、—COOH基因的染料化合物起反应,生成稳定的螯合物,该螯合物在碱性条件下通过混凝作用从水中分离出来;(2)MgCl_2在高pH值下依靠水解生成的Mg(OH)_2胶体沉淀物对染料分子的吸附和卷扫沉降作用达到脱色目的。     

金属膜对L-缬氨酸发酵液过滤的研究

研究了金属膜过滤的各种操作参数对L-缬氨酸过滤效果的影响，综合各方面的因素确定了最适工艺条件：进出膜压力分别为4．0MPa和3．0MPa，过滤温度为25℃，过滤液pH为3．0。在此操作条件下，蛋白质去除率达到87．36％以上，色素去除率达48．61％，L-缬氨酸收率达90．2％。     

论运动员过度训练的预防和消除

通过对运动训练中常见的“过度训练”的概念、症状、类型等问题的分析,从运动生理、心理及运动训练学角度研究过度训练产生的原因和机制,提出过度训练预防和消除的具体措施．     

Simultaneously catalytic removal of NO<Subscript><Emphasis Type="Italic">x</Emphasis></Subscript> and particulate matter on diesel particulate filter

Diesel engines combine a high fuel economy with high durability and low maintenance costs and are, there-fore, used on a large scale for transportation purposes.However, the environmental pollution by diesel-engine exhausts has become more and more serious in the lastdecade, and currently the regulation of diesel emissions becomes tightened especially with respect to nitrogen ox-ides (NOx) and particulate matters (PM). Since the reduc-tion of both NOx and PM to the admitted level cannot be …     

Reactions Between Humic Acid Solutions and Excessive ClO2 or Cl2

Reactions between humic acid solutions and excessive ClO2 or Cl2 have been investigated. Under various experimental conditions, the removal efficiency of TOC, UV254 and A140 from humic acid solutions were examined. The relationship between the removal efficiency and the consumption of ClO2 or Cl2 was discussed. The results showed that the maximum demand of ClO2 was 2.19 mg/mg TOC for the humic acid solution under the experimental conditions, and that of Cl2 was 1.88 mg/mg TOC. The variation tendency of ClO2 consumption was similar to that of Cl2. TOC of humic acid solutions decreased 15.2% and 15.6% after the reaction with ClO2 or Cl2 respectively. Under the experimental conditions, 21.4% of unsaturated bonds and 52.8% of humic acid color were removed by ClO2 in 168 h. As for Cl2, removal efficiency of unsaturated bonds and humic acid color were 16.8% and 41.7% respectively. Larger molecules from humic acid were oxidized to smaller molecules by ClO2 and Cl2. Higher oxidation potential of ClO2 than that of Cl2 was also indicated by variation of UV254/A410 ratios. The similar tendency, that exhibited faster variation in the initial 24 h, existed for all the research factors.     

低浓度氨氮污水厌氧氨氧化影响因素试验

针对我国城市污水氨氮浓度低、碳源不足的特征及处理出水难以达标的情况,采用序批式生物反应器(SBR)研究低浓度氨氮条件下厌氧氨氧化反应途径及其影响因素.采用自配进水.经过5个月的厌氧运行,成功启动了厌氧氨氧化反应器.在稳定运行期,NH4 -N平均去除率这94.5%;NO2--N平均去除率达97.4%.在此基础上,研究了pH值、温度及化学需氧量(COD)对厌氧氨氧化反应过程的影响,并确定各因素的最佳控制范围.研究结果表明:在低质量浓度氨氮(NH4 -N～12 mg/L)条件下,厌氧氨氧化反应pH值为7.5～8.0、温度为30～35℃、COD为0～50 mg/L时反应达到最佳状态,为我国低浓度氨氮城市污水的生物脱氮提供了新的途径.     

组合式生物脱氮除碳法处理尼龙6废水

用包含水解酸化、硝化和反硝化三个反应器的组合式生物脱氮除碳系统处理尼龙6废水,着重分析了该系统的回流比,溶解氧。结果显示系统的最佳工艺参数为:回流比为3,反应器的溶解氧分别为0.5～1.0mg·L-1、3.0～3.3mg.L-1、1.8～2.3mg·L-1、,同时CODCr和TN的去除率分别为95.85%、61.04%。     

计算全息三维信息获取的研究

计算全息所用的目标数据一般是通过计算机三维软件模拟获得，这样对于计算全息的应用有一定的限制．提出利用三维激光扫描仪获取计算全息图三维数据的方法，研究了计算全息物光分布和扫描三维数据之间的关系，建立了依据三维物体扫描数据的模拟物光波前分布，并分析了立体数据计算全息消隐问题．     

负顾客可服务的Geom/Geom/1离散时间排队模型

研究了一个单服务台的离散时间排队模型，正负顾客的到达服从几何分布，并且可以同时到达，正负顾客处于同等的位置．给出了两种抵消规则：抵消队尾的顾客，无论此顾客是否正在接受服务；抵消队尾的顾客，此顾客不在接受服务．负顾客到达后分别以这两种不同的抵消规则抵消系统中的正顾客；如果负顾客到达后，系统为空，则负顾客和正顾客一样，接受服务．通过求解方程组，得到这一模型的系统队长和等待队长的概率母函数以及系统队长和等待队长的稳态分布．