光伏废水处理工程设计

山西省某光伏企业采用生物接触氧化-混凝沉淀工艺处理企业生产废水和厂区生活污水。经调试运行,出水水质达到污水综合排放标准(GB 8978-1996)中的一级排放标准。工艺可行且管理方便,运行费用低,处理效果稳定。     

人丙酮酸羧化酶异位表达提高中国仓鼠卵巢细胞补料分批培养后期活率

构建了人丙酮酸羧化酶(hPC)异位表达的重组CHO细胞,并检测了重组细胞生长情况的改变。利用分子生物学实验技术构建hPC-pcDNA 3.0表达载体,将其转染CHO-K1细胞;转染细胞经过G418抗性筛选后,通过荧光定量PCR检测目的基因表达,并挑选表达量最高的克隆进行补料分批培养。电泳及测序结果显示,构建的hPC-pcDNA3.0表达载体序列与预期一致;在mRNA水平鉴定目的基因显示,4#克隆的mRNA表达水平最高;选其进行补料分批培养,生长曲线显示在培养后期,其活细胞密度和细胞活率均高于对照。成功构建了细胞生长和活率改善的重组CHO细胞,获得了生长改善的细胞株,为后续的重组蛋白表达研究与细胞培养工艺优化奠定了基础。     

氧化镁—锆英石钢包浇注料的研制

以电熔镁砂和锆英石为原料,研制了氧化镁-锆英石钢包浇注料,并研究了锆英石加入量对浇注料性能的影响及热处理温度对浇注料强度的影响,同时对其机理进行了探讨.     

The bottom-up synthesis for aramid nanofibers: The influence of copolymerization

Aramid based on poly (p-phenylene terephthalamide) (PPTA) is widely concerned as high-performance materials. Herein, copolymerized aramid nanofibers (CANFs) were prepared for the first time by a direct bottom-up polymerization method without additives. Three kinds of third monomers of m-phenylenediamine, 4,4′-diaminodiphenyl ether, and 2,5-dichloro-1,4-phenylenediamine were separately copolymerized in PPTA and transformed into nanofiber dispersions in water medium. The characterization results revealed the relationship between the morphology of products and the structure as well as dosages of the different kinds of monomers, which was explained by the influence on conjugate regularities of the PPTA molecules. Furthermore, CANFs were used to build aramid paper blended in pure PPTA nanofibers, and the mechanical and insulation properties of composite paper were improved significantly, which would be of potential use as the new building block for aramid composite materials.     

面向智能制造的工业结晶研究进展

工业结晶是一门“半艺术的科学”,具有多目标、非线性和强耦合的特点,在国际上被公认是最难设计的化工单元操作之一。面向智能制造发展的重大战略需求和历史机遇,基于国内外对工业结晶和智能制造的研究现状,拟构建基于智能制造的工业结晶多尺度研究框架。结合相关案例,总结了国内外人工智能、云计算、物联网等核心智能制造技术在工业结晶中的应用,重点分析讨论在溶解度预测、晶型预测、晶习预测、共晶预测与智能制造的发展现状和潜在结合点;总结了结晶过程中的感知、分析、决策的智能控制技术。     

纳米氧化锆添加量对氧化锆制品性能的影响

在电熔单斜氧化锆原料中添加不同数量的CaO稳定剂,制备部分稳定氧化锆,研究CaO加入量和稳定相数量的关系.在制备的CaO部分稳定氧化锆中添加纳米氧化锆粉体,经过造粒、200 MPa压力成型、干燥、1650 ℃×2 h烧成制得试样.测试试样的物理性能、分析矿物相组成、观察显微结构,研究纳米氧化锆粉体添加量对试样性能的影响.研究结果表明:2Ca-PSZ、3Ca-PSZ、4Ca-PSZ试样中,4Ca-PSZ试样稳定化程度最高;3Ca-PSZ试样显气孔率小,体积密度较大,耐压强度高.在3Ca-PSZ试样中加入纳米氧化锆粉体,随着加入量的增加,试样的显气孔率下降、烧成收缩率增加、耐压强度提高.其中纳米氧化锆粉体添加比例为8wt%时,试样气孔率为9.4%,体积密度为5.08 g/cm3,抗压强度达到381 MPa.与3Ca-PSZ试样相比,气孔率下降40%,体积密度提高5%,耐压强度提高70%.     

内压作用下斜接弯管纵向半穿透裂纹应力强度因子研究

采用三维有限元技术,应用ANSYS对内压作用下含纵向半穿透裂纹斜接弯管的应力强度因子进行了系统的分析。建立了三维有限元裂纹模型,对裂纹前沿应力强度因子的影响因素进行了研究,分析了不同内压下无量纲参数裂纹相对深度a/t、裂纹相对形状b/a、管壁相对厚度Do/t对应力强度因子的影响。     

A novel hollow fiber membrane-assisted antisolvent crystallization for enhanced mass transfer process control

Herein, a novel hollow fiber membrane-assisted antisolvent crystallization (MAAC) was proposed to enhance the mass transfer control over the antisolvent crystallization. A polyethersulfone membrane module was introduced as the key device for antisolvent transfer and solution mixing. An antisolvent liquid film layer was formed on the membrane surface and mixed with the solution. The liquid film also prevented the membrane from directly contacting with crystallization solution. By controlling both the shell side flow velocity and the antisolvent transfer, the antisolvent permeation rate achieved sensitive, stable, and accurate control during long-term and repeated utilization. The interfacial mass transfer rate of MAAC was 0.66 mg cm⁻² s⁻¹, which was only 1/50 that of conventional droplet antisolvent crystallization. MAAC also provided crystal products with better morphologies and narrower size distributions than the conventional process. The stable performances of MAAC in terms of its accurate antisolvent mass transfer and antifouling capabilities were also highlighted. © 2018 American Institute of Chemical Engineers AIChE J, 65: 734–744, 2019     

CO2管内流动沸腾干涸特性研究

CO₂被认为是一种理想的替代制冷剂,具有良好的环境特性和优良的热力学特性。与传统制冷剂相比,CO₂有着十分不同的流动沸腾换热特性,过程会发生干涸将使其换热能力大幅下降。然而现有的干涸点预测公式都是基于各自的实验数据拟合得出,由于数据点太少和变量参数范围受限导致关联式的预测结果存在偏差。所以,通过对17篇文献中搜集的4986个实验数据点进行整理,分析得出质量流率、热通量、饱和温度和管径等影响因素对干涸点的影响趋势,并将数据点按大小压力分别拟合得出了干涸点的预测公式,有90%的数据点偏差小于15%,对干涸点预测,防止传热恶化有重要意义。