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Optimization and evaluation of reduced graphene oxide hydrogel composite as a demulsifier for heavy crude oil-in-water emulsion

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Chinese Journal of Chemical Engineering 2021年第5期34卷 297-305页

作者： Kin Kit fong Inn Shi Tan Henry Chee Yew Foo Man Kee Lam Adrian Chiong Yuh Tiong Steven Lim Department of Petroleum Engineering Faculty of Engineering and ScienceCurtin UniversityCDT 25098009 MiriSarawakMalaysia Department of Chemical Engineering Faculty of Engineering and ScienceCurtin UniversityMiri 98009Malaysia Chemical Engineering Department Universiti Teknologi PETRONASSeri Iskandar 32610Malaysia HICoE-Centre for Biofuel and Biochemical Research Institute of Self-Sustainable BuildingUniversiti Teknologi PETRONASSeri Iskandar 32610Malaysia Department of Chemical Engineering Lee Kong Chian Faculty of Engineering and ScienceUniversiti Tunku Abdul RahmanKajang 43000Malaysia Centre for Photonics and Advanced Materials Research Universiti Tunku Abdul RahmanKajang 43000Malaysia

The rising production of produced water from oilfields had been proven to bring detrimental environmental *** this study,an efficient,recyclable,and environmental-friendly reduced graphene oxide immobilizedκ-Carrageenan hydrogel composite(κCaGO)was fabricated as an alternative sorbent for crude oil-in-water ***(PEI)was employed to form a stable hydrogel *** conditions for the immobilization of graphene oxide(GO)on PEI-modifiedκ-Carrageenan(κC)beads were optimized *** immobilization yield of 77%was attained at 2%PEI,2 h immobilization activation time,and pH ***,the synthesizedκCaGO is capable of demulsification with an average demulsification efficiency of 70%.It was found that the demulsification efficiency increases with salinity andκCaGO dosage,and it deteriorates under alkaline *** phenomena can be attributed to the interfacial interactions betweenκCaGO and the ***,theκCaGO can be recycled to use for up to six cycles without significant leaching and *** such,the synthesizedκCaGO could be further developed as a potential sorbent substitute for the separation of crude oil from produced water.

关键词： Graphene oxide κ-Carrageenan Adsorbents Demulsification Composites Waste water

Synergistic nano-tribological interaction between zinc dialkyldithiophosphate(ZDDP)and methyl oleate for biodiesel-fueled engines

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Friction 2021年第3期9卷 612-626页

作者： Siti Hartini HAMDAN Chiew Tin LEE Mei Bao LEE William Woei fong CHONG Cheng Tung CHONG Suhaila Mohd SANIP Bio-Engineering Technology Department University Kuala Lumpur Malaysian Institute of Chemical&Bioengineering Technology(UniKL MICET)Alor Gajah 78000Malaysia School of Mechanical Engineering Faculty of EngineeringUniversiti Teknologi Malaysia(UTM)Johor Bahru 81310Malaysia Automotive Development Centre(ADC) Universiti Teknologi Malaysia(UTM)Johor Bahru 81310Malaysia China-UK Low Carbon College Shanghai Jiao Tong UniversityShanghai 201306China Faculty of Engineering and Physical Sciences University of Southampton Malaysia(UoSM)Iskandar Puteri 79200Malaysia

In biodiesel-fueled compression-ignition(CI)engines,dilution by unburned biodiesel has been found to have adverse effects on the boundary lubrication properties of additives in fully formulated engine *** dilution of engine lubricants could be even more pronounced for CI engines running on higher blend concentrations of *** the nanoscopic nature of the interaction,this study seeks to determine the nano-tribological properties of an engine lubricant additive(e.g.,zinc dialkyldithiophosphate(ZDDP))when diluted with a fatty acid methyl ester(e.g.,methyl oleate).Using lateral force microscopy(LFM)together with a fluid imaging technique,the lowest nanoscopic friction forces and coefficient of friction values(0.068-0.085)were measured for ZDDP when diluted with 70 vol%of methyl *** values are also observed to be lower than those measured for neat ZDDP and neat methyl oleate,respectively,under similar ***,interpreting the data with the Eyring thermal activation energy approach,it could then be elucidated that the lower frictional losses observed for the contact lubricated with this volumetric mixture are a result of the lower potential energy barrier and activation energy required to initiate *** energy values are approximated to be 2.6%and 28.9%(respectively)lower than that of the contact lubricated with neat *** was also found that the mixture,at this volumetric concentration,possesses the highest possible pressure activation energy(load-carrying capacity)along with the lowest possible shear activation energy(shearing),potentially indicating optimum tribological conditions for boundary ***,the findings of this study suggest that an optimum concentration threshold exists in which a synergistic nano-tribological interaction between additives and fatty acid methyl esters can be attained,potentially reducing boundary frictional losses of lubricated *** findings could prove to be ess

关键词： boundary lubrication lateral force microscopy thermal activation energy methyl ester boundary additives

Microbial reduction of graphene oxide and its application in microbial fuel cells and biophotovoltaics

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Frontiers of Materials Science 2023年第2期17卷 45-63页

作者： Jing-Ye Tee fong-Lee Ng Fiona Seh-Lin Keng G.Gnana kumar Siew-Moi Phang Institute of Ocean and Earth Sciences(IOES) Universiti Malaya50603 Kuala LumpurMalaysia Institute for Advanced Studies Universiti Malaya50603 Kuala LumpurMalaysia Department of Physical Chemistry School of ChemistryMadurai Kamaraj UniversityMadurai 625021Tamil NaduIndia Faculty of Applied Sciences UCSI University56000 Kuala LumpurMalaysia

Despite more than a decade of study,there are still significant obstacles to overcome before graphene can be successfully produced on a large scale for commercial *** oxidation of graphite to produce graphene oxide(GO),followed by a subsequent reduction process to synthesize reduced graphene oxide(rGO),is considered the most practical method for mass ***,which are abundant in nature and inexpensive,are one of the potential green reductants for rGO ***,there is no recent review discussing the reported microbial reduction of GO in *** address this,we present a comprehensive review on the reduction of GO by a range of microorganisms and compared their efficacies and reaction ***,presented were the mechanisms by which microorganisms reduce *** also reviewed the recent advancements in using microbially reduced GO as the anode and cathode material in the microbial fuel cell(MFC)and algal biophotovoltaics(BPV),as well as the challenges and future directions in microbial fuel cell research.

关键词： reduced graphene oxide microbial reduction microbial fuel cell algal biophotovoltaics green chemistry

A Stability Criterion for Time-Delay Tension Leg Platform Systems Subjected to External Force

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China Ocean Engineering 2009年第1期23卷 49-57页

作者： Chen-Yuan CHEN Chien-wen SHEN Cheng-Wu CHEN Kevin fong-Rey LIU Ming-Jen CHENG Department of Management Information System Yung- Ta Institute of Technology and Commerce Ping-Tung County 90941 China Department of logistics Management National Kaohsiung First University of Science and Technalgy Kaohsiung City 811 China Department of Logistics Management Shu- Te University Kaohsiung 82445 China Graduate Institute of Management National Kaohsiung First University of Science and Technolgy Kaohsiung City 811 China Department of Safety Health and Environmental Engineering Ming Chi University of Technology Taipei 24301 China

Stability analysis plays a central role in nonlinear system theory and engineering application. Over the past few years, the stability analysis of fuzzy systems has been proposed and there are many successful applications in practical engineering. Therefore, in this paper firstly proposed is the stability analysis on oceanic structure by fuzzy models. In the present study, Takagi-Sugeno （T-S） fuzzy model is proposed for a time delay tension leg platform （TLP） system subjected to an external wave force. In terms of stability analysis, linear matrix inequality （LMI） conditions are derived via Lyapunov theory to guarantee the stability of the TLP system.

关键词： linear matrix inequality tension leg platform fuzzy model

A Loaded Label:Intricacies of Being a Fan in Henrik and Sara Linden's Fans and Fan Cultures

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Fudan Journal of the Humanities and Social Sciences 2020年第4期13卷 615-622页

作者： Alexandra fong Department of Media Cultureand CommunicationNew York University Steinhardt School of CultureEducationand Human Development239 Greene St8th FloorNew YorkNY 10003USA

In Fans and Fan Cultures,Henrik and Sara Linden examine what it means to be a fan in an increasingly globalized,digitized,and capitalized *** an age when personal information is easily searchable in the Internet era,people can now become fans immediately with the click of a"like,""follow,"or"subscribe"*** ideal fan is not an obsessive fanatic who claims ownership of the product,but rather one who is balanced and has a following of their own,thus making them not only a fan,but also an influencer and a brand *** worldwide media is largely controlled by an exclusive number of corporations that determine what kind of media we consume,fandom and fan communities offer a compromise:Though corporations and brands shape and control the majority of media content,fandom serves as an opportunity for people with shared interests to come together,forge connections,and find a sense of value and belonging that exists outside the *** analysis will concentrate on a selection of Linden and Linden's topics and explore how fandom has become a manifestation of the need for authentic,meaningful connections in a time when technological development effectively renders authenticity as a bargaining chip in a much larger marketing ploy.

关键词： Fandom Fan culture Fan creation Consumerism Social media Cultural production Connection Authenticity Coping mechanisms Identity

Conceiving Yin and Yang:Harmony and You

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Chinese Journal of Integrative Medicine 2011年第9期17卷 650-654页

作者： Man fong Mei The Chinese Medical Institute and Register(CMIR).101-105 Camden High Street London NW1 7JNUK

We all know that＂it takes two to tango＂.A man and a woman dancing in unison is a simple way to perceive the idea of yin（阴） and yang（阳）.At the same time,when the male partner moves his right foot forward,the fe... 详细信息

关键词：前体细胞淋巴母细胞白血病淋巴瘤舞蹈医院信息系统胰岛素阴阳足男(雄)性女(雌)性

Advanced nanofabrication for elastic inorganic aerogels

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Nano Research 2024年第10期17卷 8842-8862页

作者： Xiaota Cheng Xinyi Chang Fan Wu Yalong Liao Kai Pan Hao fong Jianyong Yu Yi-Tao Liu Bin Ding Innovation Center for Textile Science and Technology College of TextilesDonghua UniversityShanghai 201620China Aerospace Institute of Advanced Material and Processing Technology Beijing 100074China College of Materials Science and Engineering Beijing University of Chemical TechnologyBeijing 100029China

Inorganic aerogels with low density,high porosity,large specific surface area,and superior mechanical properties are excellent candidate materials in fields such as thermal management,energy,catalysis,and biomedical applications.A comprehensive overview of existing elastic inorganic aerogels is provided,covering their structural units,preparation methods,mechanical performances,and ***,based on the constituent building blocks and microstructures,a detailed analysis of the mechanical properties and guidelines for elastic design of aerogels is *** with a succinct summary of prospective developmental direction,this review deliberates on the challenges and potential opportunities of elastic inorganic aerogels,with the intent of providing a versatile platform for designing new types of elastic inorganic aerogels for various applications.

关键词： inorganic aerogels compressive stretchable fabrication mechanical performances applications

Unsupervised Anomaly Detection via DBSCAN for KPIs Jitters in Network Managements

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Computers, Materials & Continua 2020年第2期62卷 917-927页

作者： Haiwen Chen Guang Yu Fang Liu Zhiping Cai Anfeng Liu Shuhui Chen Hongbin Huang Chak fong Cheang College of Computer Science National University of Defense TechnologyChangshaChina School of Data Science and Computer Science Sun Yat-sen UniversityGuangzhouChina College of Information and Engineering Central South UniversityChangshaChina Faculty of Information Technology Macao University of Science and TechnologyMacao

For many Internet companies,a huge amount of KPIs(e.g.,server CPU usage,network usage,business monitoring data)will be generated every *** to closely monitor various KPIs,and then quickly and accurately detect anomalies in such huge data for troubleshooting and recovering business is a great challenge,especially for unlabeled *** generated KPIs can be detected by supervised learning with labeled data,but the current problem is that most KPIs are *** is a time-consuming and laborious work to label anomaly for company *** an unsupervised model to detect unlabeled data is an urgent need at *** this paper,unsupervised learning DBSCAN combined with feature extraction of data has been used,and for some KPIs,its best F-Score can reach about 0.9,which is quite good for solving the current problem.

关键词： Anomaly detection KPIs unsupervised learning algorithm

CONCENTRATIONS OF Cd, Cu AND Zn IN SEDIMENTS COLLECTED FROM URBAN LAKES AT KELANA JAYA, PENINSULAR MALAYSIA

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湿地科学 2004年第4期2卷 248-258页

作者： Ahmad Ismail Chee Kong YAP fong Fei Chan Department of Biology Faculty of Science Universiti Putra MalaysiaDepartment of Biology Faculty of Science Universiti Putra MalaysiaDepartment of Biology Faculty of Science Universiti Putra Malaysia UPM 43400 Serdang Selangor MalaysiaUPM 43400 Serdang Selangor MalaysiaUPM 43400 Serdang Selangor Malaysia

Kelana Jaya Municipal Park is a popular recreation park in Petaling Jaya. The five lakes, located within the Park, were ex-mining ponds, functioning as flood retention ponds and receiving effluents from nearby human activities mainly from residents and transportation. A study was conducted to determine the distribution and sources of heavy metals (Cd, Cu and Zn) in the sediments of Kelana Jaya Lakes. Concentrations of Cd, Cu, and Zn for surface sediment were determined by using aqua-regia method and sequential extraction technique. Total Cd concentrations ranged from 0.48 μg/g to 2.68 μg/g dry weight (dw) for all lakes. Total Cd concentrations in sediment of all lakes exceeded CCME (Canadian Council of Ministers of the Environment, 2001) guidelines. Total Cu concentrations ranged from 7.37 μg/g to 73.6 μg/g (dw). Only Cu concentration in one lake exceeded the CCME guidelines besides having the highest mean concentration among all. Total Zn concentrations ranged from 107 μg/g to 529 μg/g (dw). Again, The Zn concentrations in three lakes were found to exceed CCME guidelines for Zn concentration in freshwater sediment. Geochemical study on sediment revealed that nonresistant fractions for Cd, Cu and Zn for other lakes there were higher than ‘resistant’ fraction. The elevated levels and most percentages (>50%) of nonresistant fractions of Cu and Zn indicated that lakes in the park, especially near oxidation pond and monsoon drains, could have received anthropogenic metals from domestic wastes. Rehabilitation program and regular biomonitoring at Kelana Jaya Lakes are therefore recommended.

关键词： Cd Cu Zn 沉积物湖泊重金属马来群岛环境污染