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Motor oil degradation during urban cycle road tests

Friction 2021年第5期9卷 1002-1011页

作者： Lei WEI Haitao DUAN Yongliang JIN Dan JIA Bingxue CHENG Jianfang LIU Jian LI State Key Laboratory of Special Surface Protection Materials and Application Technology Wuhan Research Institute of Materials ProtectionWuhan 430030China College of Mechanical Engineering Hunan Institute of Science and TechnologyYueyang 414006China State Key Laboratory of Tribology Tsinghua UniversityBeijing 100084China College of Biological and Pharmaceutical Engineering Wuhan Polytechnic UniversityWuhan 430023China

Several civilian vehicles in China operate in urban traffic conditions and have their motor oil changed every 5,000 *** study investigates the variations in oil properties after servicing at 5,000 km,based on systematic road tests(including a repeated test,a parallel test,and a new vehicle test).The physicochemical properties,changes in components,oxidation stability,detergent‐dispersant performance,and tribological properties of motor oils were *** results showed that the total acid number(TAN)of oils increased with the operation mileage,by up to 1.41 mgKOH/*** total base number(TBN)decreased after the road tests were completed,and the decrease was less than 44.6%.The kinematic viscosity(KV)of most oils decreased initially and then stabilized in the middle stage,before starting to increase later in the *** change in KV at 100℃was less than 15.96%.The oxidation onset temperature(OOT)of the oils diminished gradually with the operation *** OOT values of the used oils were higher than 210℃.A spot test indicated that the used oils retained their detergentdispersant performance to an appropriate *** four‐ball wear scar diameters and friction coefficient of the used oils did not increase significantly after the road tests were *** study can serve as a reference for end‐users when changing motor oils.

关键词： motor oil urban vehicles oil degradation road test oil analysis

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Isolation and characterization of a crude oil degrading bacteria from formation water:comparative genomic analysis of environmental Ochrobactrum intermedium isolate versus clinical strains

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Journal of Zhejiang University-Science B(Biomedicine & Biotechnology) 2015年第10期16卷 865-874页

作者： Lu-jun CHAI Xia-wei JIANG Fan ZHANG Bei-wen ZHENG Fu-chang SHU Zheng-liang WANG Qing-feng CUI Han-ping DONG Zhong-zhi ZHANG Du-jie HOU Yue-hui SHE Key Laboratory of Marine Reservoir Evolution and Hydrocarbon Accumulation Mechanism School of Energy Resources China University of Geosciences State Key Laboratory for Diagnosis and Treatment of Infectious Diseases the First Affiliated HospitalSchool of Medicine Zhejiang University College of Chemistry and Environmental Engineering Yangtze University Institute of Porous Flow & Fluid Mechanics Chinese Academy of Sciences State Key Laboratory of Heavy oil Processing China University of Petroleum

In this study, we isolated an environmental clone of Ochrobactrum intermedium, strain 2745-2, from the formation water of Changqing oilfield in Shanxi, China, which can degrade crude oil. Strain 2745-2 is aerobic and rod-shaped with optimum growth at 42 ℃ and pH 5.5. We sequenced the genome and found a single chromosome of 4800175 bp, with a G＋C content of 57.63%. Sixty RNAs and 4737 protein-coding genes were identified： many of the genes are responsible for the degradation, emulsification, and metabolizing of crude oil. A comparative genomic analysis with related clinical strains （M86, 229E, and LMG3301T） showed that genes involved in virulence, disease, defense, phages, prophages, transposable elements, plasmids, and antibiotic resistance are also present in strain 2745-2.

关键词： Comparative genome Ochrobactrum intermedium oil degradation Pathogen

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