Quantitative analysis of micro structural and conductivity evolution of Ni-YSZ anodes during thermal cycling based on nano-computed tomography

Understanding the mechanism of degradation in solid oxide fuel cells (SOFCs) using nickel/yttria-stabilized zirconia (Ni-YSZ) as the anode material is very important for the optimization of cell performance. In this work, the effects of thermal cycling on the microstructure of the Ni-YSZ anode are explored using the three-dimensional X-ray nano computed tomography (nano-CT) imaging technique. It is found that the average Ni particle size increased with thermal cycling, which is associated with the decreased connectivity of the Ni phase and the three-phase-boundary (TPB) length. Moreover, the conductivities of the anode samples are also reduced with the increase in thermal cycle times. The implication of these observations is discussed in terms of the relationship between the conductivity and connectivity of the Ni phase.     

阴离子聚合体系活性种聚合活性的探讨

讨论了非极性和极性溶剂中有机锂活性种的活性,指出添加少量极性添加剂或在极性溶剂中,由于溶剂化作用,有机锂活性种的聚合活性有所降低。     

Preparation of UV-curable functionalized graphene/polyurethane acrylate nanocomposite with enhanced thermal and mechanical behaviors

Functionalized graphene nanosheets (f-GNSs) were synthesized by a simple covalent functionalization of graphene with 3-methacryloxypropyl trimethoxysilane (MPTES). The results from FTIR, XPS and XRD showed that MPTES was successfully attached onto the surface of graphene. Functionalized graphene/polyurethane acrylate (f-GNS/PUA) nanocomposites were prepared by UV radiation of PUA with f-GNS. The onset thermal degradation temperature of f-GNS/PUA nanocomposite was increased by 16 °C, at an f-GNS content of 1 wt%. Meanwhile, the storage modulus and glass transition temperature of the nanocomposites were enhanced by incorporating f-GNS into the PUA. This is believed to be attributed to that the covalent functionalization of graphene can improve both the dispersion of f-GNSs in the polymer matrix and the interfacial interactions between f-GNSs and PUA.     

空分设备压力容器设计中的几个问题探讨

介绍了空分设备压力容器设计中,在设计压力和设计温度的选取、焊接接头设计、开孔补强、封头壁厚、支座设置和无损检测等方面应注意的问题,并提出相关建议。     

A/O-MBR处理PTA综合废水中试研究

试验研究对象为辽宁省某石化公司PTA综合废水。中试采用了缺氧好氧一体式膜生物反应器(A/O-MBR)工艺。经过60 d左右的运行,试验结果表明,系统处理效果理想。在进水COD为291～713 mg/L、总氮为19～51mg/L的情况下,系统出水COD<30 mg/L、氨氮<0.2 mg/L、总氮<10 mg/L,而且MBR出水浊度<0.2 NTU、SS<5 mg/L、含油量<0.3 mg/L,因此系统出水指标优于《辽宁省污水综合排放标准》(DB 21/1627—2008),同时达到可回用于国家工业循环冷却水系统补水的水质要求。     

农药杀虫剂中11种禁限用农药的同时检测

建立了用气相色谱-质谱法同时测定11中禁限用农药的方法。在EI模式下,以选择离子扫描(SIM)方式采集数据进行定量分析。11种农药在相应的质量范围内线性良好,变异系数小于3%,添加回收率介于90%~110%之间。方法具有快速、简便、精密度和准确度高、线性关系好的优点,是较理想的分析方法。     

我国纺丝油剂现状及发展趋势

随着化纤工业的发展,我国纺丝油剂生产增长较快,但与国外公司相比尚未形成竞争优势。本文介绍了我国纺丝油剂生产发展现状,提出了存在的问题及对策。     

Receptor-Based Fluorescence Polarization Assay to Detect Phthalate Esters in Chinese Spirits

This work developed a fluorescence polarization (FP) assay for detection of phthalate esters (PAEs) in Chinese spirits. A mouse-derived recombinant peroxisome proliferator-activated receptor α ligand binding domain (mPPARα-LBD*) and a fluorescent-labeled fatty acid (C4-BODIPY-C9) were employed as recognition element and fluorescent tracer, respectively, providing the limits of detection (LODs) below 11.2 μM for the 10 PAEs tested in buffer. Chinese spirits spiked with DEHP and DBP could be positively detected in combination with simple pretreatment, with recoveries ranging from 76.9 to 87.0 % and with coefficients of variation below 10 %. Additionally, the mechanisms of mPPARα-LBD* binding to PAEs were investigated by using molecular simulation approach. The results suggested that the proposed method was reliable for monitoring PAEs in Chinese spirits.     

聚合物—正电胶钻井液体系

同一口井的钻井液,上部地层快速钻进,对钻井液的携岩性、防塌性、抑制包被性能及固相控制要求更高。聚合物—正电胶钻井液能满足上部地层快速钻进要求。它具有较强抑制包被作用,在强造浆地层及不造浆易分散地层中,有利于固相控制;具有较强剪切稀释能力,能满足高压喷射及快速钻进的要求;具有良好的携岩性,能满足井眼清洁的要求;还具有良好的防塌性,能保证井眼规则。实践证明：聚合物—正电胶钻井液在上部地层快速钻进中,是一种理想的选择,获得了良好的经济效益。