Parametric analysis of the effect of operation parameters on asphaltene deposition: An experimental study

Changing pressure, temperature, and composition cause instability in crude oil and create a problematic issue which is called asphaltene deposition. Asphaltene deposition causes problems in wettability alteration and flow assurance in different parts of petroleum industry so asphaltene deposition becomes a challenging issue in petroleum engineering. Hence, it is necessary to predict asphaltene deposition and investigate parameters which effect on asphaltene deposition. In this contribution, because of similarity between pore throat of reservoir rock and capillary tube, to investigate parameters such as asphaltene content, precipitant ratio, flow rate, and temperature effect on asphaltene deposition, a capillary setup was constructed and a model was developed to relate pressure drop along capillary tube to permeability reduction.     

新型高低温环境箱的设计

针对机组式高低温环境试验箱温度变化范围宽的特点,对机组式高低温环境试验箱进行了全新的设计。该环境箱采用复叠式制冷机组制冷,控温范围为-190℃~+400℃;高低温箱分体式设计,防止高温损坏蒸发器;设计了制冷量调节结构。     

聚氯乙烯树脂中痕量残留氯乙烯含量的测定

提出用大口径毛细管顶空进样气相色谱法对聚氯乙烯树脂中十亿分之一级残留氯乙烯含量的测量方法。方法简便易操作 ,并具有较好的准确度和精密度。     

Electrophoretic Extraction of Cells/Particles in a Counter Current Extractor

Abstract

Electrophoretic separation is a leading method for resolving mixtures of charged macromolecules or cells. In the present work, a combination of free electrophoresis and multistage extraction called Electrophoretic Counter Current Extractor was explored. A simple mathematical model was developed to describe the mass and heat transfer during the electrophoretic separation. In order to validate the model and also to test the extractor, the extraction of fixed human Red Blood Cells and Latex particles of different sizes suspended in phosphate buffer, was performed at different electric field strengths. The experimental results were found to agree reasonably well with those predicted by the model.     

雌激素的加压毛细管电色谱分析研究

论文基于苯乙烯基功能整体柱,建立了五种环境雌激素的加压毛细管电色谱分析方法,并应用于鱼肉样品分析。实验考察了有机溶剂浓度、酸度、分离电压、盐浓度、流速等条件对五种雌激素分离的影响。在最优条件下,五种环境雌激素在18 min内实现了基线分离,在4.0×10-7-8.0×10-5g/mL范围内线性良好,检测限在0.8×10-7-5×10-7g/mL范围内。该方法应用于鱼肉实际样的测定,获得回收率范围是78.0%-88.5%。效果良好。     

KYKY-QP1000AG/CMS毛细管连接技术研究

作者在多年GS MS应用实践中 ,摸索出十分有用的毛细管连接技术 ,显著地提高了KYKY -QP10 0 0AGC MS的检出灵敏度 ,扩展了仪器的适应范围 ,为拥有同类仪器的同行提供了很好的帮助     

制冷与空调系统中毛细管流量的测试方法研究

分析了目前制冷工业生产中对毛细管进行检测的现状,指出了现有检测方法存在的缺陷,提出了一种新的方法——等效对比代换法。根据此新方法,设计了一种新的毛细管流量检测装置。同时,在研究分析的基础上,对毛细管实验方法的国家标准GB/T23683—2009提出了新的建议和补充。     

Determination of nitrates,nitrites and oxalates in food products by capillary electrophoresis with pH-dependent electroosmotic flow reversal

This paper describes an innovative and rapid capillary electrophoretic method for the simultaneous analysis of nitrates, nitrites and oxalates, which are anions of food interest. The novelty of our method is based on reversing the electroosmotic flow without using any buffer additive nor performing a capillary coating, but simply employing a buffer at low pH values.