Prediction of gas–liquid interfacial area in valve trays

An accurate prediction of gas–liquid interfacial area is very important for the design and optimization of column trays. However, the difference of the gas–liquid flow regimes operating at different scale trays significantly affect the interfacial area calculation. Therefore, in this study, an interfacial area model operating at small column was established using the Kolmogorov's isotropic turbulence hypothesis. According to the analyzes of the gas–liquid flow phenomena of different scale columns, an assumption that the similarity principle of flow characteristics of gas–liquid in full contact was proposed. Moreover, a new model that can be used to predict the gas–liquid interfacial area of a large column with exiting the nonideal flow was obtained through the extension of the small tray interfacial area model based on this principle. Finally, the new model was tested by comparisons with the experimental results of references. The prediction accuracy significantly improved with the maximum deviation of approximately 40%. © 2015 American Institute of Chemical Engineers AIChE J, 62: 905–915, 2016     

SRT对膜生物反应器（MBR）的污泥活性和硝化性能的影响

考察了SRT分别为10 d和不排泥2种情况下MBR的运行效果和污泥特征的变化,研究结果表明,随着SRT的减小,比耗氧速率从不排泥时的10.2 mg O2/g SSh增加至SRT为10 d时的15.9 mg O2/g SSh,排泥有助于提高污泥的活性。不排泥运行和SRT为15 d两种情况的处理效果基本相同,去除效率均超过90%,继续提高氨氮负荷,M2出水NH4-N浓度增加,因此污泥停留时间应该根据不同的水质来设定。     

压缩气体吹吸式尘源控制技术实验研究

对于冷轧带钢尘源的控制,提出了一种新型控制技术——压缩气体吹吸式尘源控制技术。通过对其进行静态实验研究并确定相关的实际运行参数,结果表明,该技术能有效促进带钢表面松动的氧化铁皮的捕集,且易于在现有除尘系统上进行改造,降低车间粉尘浓度和系统能耗。     

铁钴纳米合金/天然橡胶复合材料的制备及性能研究

采用液相还原法制备铁钴合金纳米粒子（nano-FeCo）,通过不同的制备工艺与天然胶乳共混,制备铁钴纳米合金/天然橡胶复合材料（NR/nano-FeCo）。利用X射线衍射仪（XRD）和透射电子显微镜（TEM）对样品结构进行表征。并考察了复合材料的力学性能及不同制备工艺对复合材料性能的影响。结果表明,液相还原法制备的nano-FeCo粒子为无定形结构,粒径约为70 nm。在天然橡胶（NR）基体中分散均匀,分散相粒径在100 nm左右;随着纳米粒子的加入,有效地提高了复合材料的力学性能,同时,可提高NR的热老化性能。NR/nano-FeCo的最佳制备工艺是乳液共混法。     

不同形状拉伐尔喷嘴中气流行为的研究

在考虑不同形状收缩段的基础上，建立描述不同形状拉伐尔喷嘴中沿喷嘴长各部气流行为的数学模型。数值计算表明，气体速度随入口段曲率半径的增大而增大，拉伐尔喷嘴和长度则随曲率半径的增大而减小。本数学模型可为不同形状超音速氧枪的设计提供理论依据。     

Review of échelles et questionnaires d’évaluation chez l’enfant et l’adolescent (vol. 1 et 2).

Reviews the book, échelles et questionnaires d’évaluation chez l’enfant et l’adolescent (vol. 1 et 2) by Martine Bouvard (2008). This two-tome work is about the main assessment tools for children and adolescent pathology that are published in French. The chapters present different tools that facilitate the assessment of psychopathology in general, as well as tools intended at measuring anxiety (generalized anxiety, evaluation anxiety, obsessive-compulsive disorder, and post-traumatic stress disorder). To read more on this book review, please see the full text pdf. (PsycINFO Database Record (c) 2010 APA, all rights reserved)     

基于STC89C51RC电子称设计

文章给出了一种小量程电子称的结构和工作原理,并阐述了软硬件的设计思想。该设计电子称具有成本低、体积小、重量轻、精度高等特点。可完成称重计价功能。     

表面双稳铁电液晶中的层结构

从铁电液晶（ Ｆ Ｌ Ｃ）的物性出发， 描述了表面双稳铁电液晶（ Ｓ Ｓ Ｆ Ｌ Ｃ）显示结构原理和相应特点； 系统地介绍了 Ｓ Ｓ Ｆ Ｌ Ｃ 中的液晶层结构分类及相关特征。阐述了不同层结构对液晶器件双稳态的获得及电光特性的影响。     

The Internal Oxidation of Ternary Alloys. IV: The Internal Oxidation of the Most-Reactive Component Beneath External Scales of the Component Having Intermediate Reactivity

The kinetics of internal oxidation of the most-reactive component C of ternary A–B–C alloys in the presence of external scales of the oxide of the component of intermediate reactivity B, BO, are examined using convenient approximations. The precipitation of the most-stable oxide leaves behind a matrix composed of a mixture of the two most-noble components, A and B, whose composition changes with depth due to the consumption of B to form the external scale. For the calculation of the parabolic rate constant use is made of approximate expressions for the concentration of oxygen dissolved in the binary A–B metal matrix within the zone of internal oxidation and for the diffusion coefficient of oxygen as functions of the alloy composition. Numerical calculations of the parabolic rate constant of internal oxidation are carried out for different combinations of values of the various parameters involved. The results obtained for the ternary alloys are compared with the corresponding data calculated for the binary A–C and B–C alloys under the same conditions.     

石英砂均质滤料截污规律的分析研究

应用分层取样法测试了滤料层的截污量，通过滤柱试验，能够更好地分析研究石英砂均质滤料层截留浊质物的变化规律。