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Fuzzy-based risk prioritization for a hydrogen refueling facility in Malaysia

Journal of Zhejiang University-Science A(Applied Physics & Engineering) 2013年第8期14卷 834-834页

作者： Hue-yee Chong Mahidzal Dahari Hwa-jen Yap ying-tai loong Department of Mechanical Engineering Faculty of Engineering University Malaya Kuala Lumpur Malaysia

Hydrogen is starting to be mentioned as an alternative fuel to replace the fossil fuel in future transportation applications due to its characteristics of zero greenhouse gas emission and high energy efficiency. Before hydrogen fuel and its facilities can be introduced to the public, relevant safety issues and its hazards must be assessed in order to avoid any chance of injury or loss. While a traditional risk assessment has difficulty in prioritizing the risk of failure modes, this paper proposes a new fuzzy-based risk evaluation technique which uses fuzzy value to prioritize the risk of various scenarios. In this study, the final risk of each failure modes was prioritized by using the MATLAB fuzzy logic tool box with a combination of two assessments. The first assessment was concerned with the criteria which affected the actual probability of *** assessment considered the availability of the standard that was applied to prevent the likelihood of the scenario occurring. On the other hand, the second assessment was focused on evaluating the consequence of the failure by taking into account the availability of detection and the complexity of the failure rather than only the severity of the scenarios. A total of 87 failure scenarios were identified using failure modes and effect analysis(FMEA) procedures on hydrogen refueling station models. Fuzzy-based assessments were performed through risk prioritizing various failure scenarios with a fuzzy value(0 to 1) and risk level(low, medium, and high)while a traditional risk assessment approach presented the risks only in forms of level(low, medium, and/or high). Availability of the fuzzy value enabled further prioritizing on the risk results that fell in the same level of risk. This study concluded that fuzzy-based risk evaluation is able to further prioritize the decisions when compared with a traditional risk assessment method.

关键词：风险评估方法模糊值加氢站马来西亚设施优先级模糊逻辑工具箱故障模式

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Development of a system configuration for a solar powered hydrogen facility using fuzzy logic control

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Journal of Zhejiang University-Science A(Applied Physics & Engineering) 2013年第11期14卷 822-834页

作者： ying-tai loong Mahidzal DAHARI Hwa-jen YAP Hue-yee CHONG Department of Mechanical Engineering Faculty of Engineering University MalayaKuala Lumpur 50603 Malaysia

Solar energy is a natural resource which can be harnessed to provide clean electricity for hydrogen production ***, this technology is not widely used because of control issues, particularly for hydrogen refuelling stations. At present,direct or DC-DC converter couplings are the most common system configurations for hydrogen refuelling stations. However, these system configurations are costly and suffer from gas shortage at hydrogen refuelling stations. Furthermore, the hydrogen produced by such system configurations varies considerably depending on the levels of solar radiation. In order to address these issues, a new system configuration is proposed, incorporating the feedback signal of the storage level in the control system. The photovoltaic(PV) system, electrolyzer, and storage tank are integrated with a fuzzy logic controller(FLC) to determine the backup current compensation for electrolyzer operation in order to obtain the minimum power required for hydrogen production. The proposed FLC is constructed with three input variables which are the PV current, hydrogen storage level, and the battery state of charge. The rules-based fuzzy inference process is based on the proposed configuration which combines the advantages of direct and DC-DC converter coupling configurations. The simulation results show that the proposed configuration offers better adaptability to variable radiation conditions compared to other methods. This gives a more promising option for ensuring the adequacy of hydrogen supply at hydrogen refuelling stations.

关键词： Hydrogen energy Solar energy Hydrogen refueling facility Fuzzy logic

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Thermal pyrolysis conversion of methane to hydrogen(H_(2)):A review on process parameters,reaction kinetics and techno-economic analysis

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Chinese Chemical Letters 2024年第8期35卷 62-73页

作者： Yi Herng Chan Zhe Phak Chan Serene Sow Mun Lock Chung loong Yiin Shin ying Foong Mee Kee Wong Muhammad Anwar Ishak Ven Chian Quek Shengbo Ge Su Shiung Lam PETRONAS Research Sdn.Bhd.(PRSB) Kawasan Institusi BangiLot 3288&3289Off Jalan Ayer ItamKajang 43000Malaysia PETRONAS Carbon Capture&Storage(CCS)Enterprise PETRONAS Twin TowersKuala Lumpur City CentreKuala Lumpur 50088Malaysia CO_(2)Research Center(CO2RES) Department of Chemical EngineeringUniversiti Teknologi PETRONASSeri Iskandar 32610Malaysia Department of Chemical Engineering and Energy Sustainability Faculty of EngineeringUniversiti Malaysia Sarawak(UNIMAS)Kota Samarahan 94300Malaysia Institute of Sustainable and Renewable Energy(ISuRE) Universiti Malaysia Sarawak(UNIMAS)Kota Samarahan 94300Malaysia Higher Institution Centre of Excellence(HICoE) Institute of Tropical Aquaculture and Fisheries(AKUATROP)Universiti Malaysia TerengganuKuala Nerus 21030Malaysia Co-Innovation Center of Efficient Processing and Utilization of Forest Resources College of Materials Science and EngineeringNanjing Forestry UniversityNanjing 210037China Center for Global Health Research(CGHR) Saveetha Medical CollegeSaveetha Institute of Medical and Technical Sciences(SIMATS)Saveetha UniversityChennai 602105India

Hydrogen(H_(2))is a promising renewable energy which finds wide applications as the world gears toward low-carbon ***,current H_(2) production via steam methane reforming of natural gas or gasification of coal are laden with high CO_(2) ***,methane(CH_(4))pyrolysis has emerged as a potential technology to generate low-carbon H_(2) and solid *** this review,the current state-of-art and recent progress of H_(2) production from CH_(4) pyrolysis are reviewed in *** such as funda-mental mechanism and chemistry involved,effect of process parameters on the conversion efficiency and reaction kinetics for various reaction media and catalysts are elucidated and critically ***-ature,among other factors,plays the most critical influence on the methane pyrolysis *** metal/salt could lower the operating temperature of methane pyrolysis to1000℃.Based on the reaction kinetics,metal-based cata-lysts were more efficient in lowering the activation energy of the reaction to 29.5-88 kJ/mol from that of uncatalyzed reaction(147-420.7 kJ/mol).Besides,the current techno-economic performance of the pro-cess reveals that the levelized cost of H_(2) is directly influenced by the sales price of carbon(by-product)generated,which could offset the overall ***,the main challenges of reactor design for efficient product separation and retrieval,as well as catalyst deactivation/poisoning need to be debottlenecked.

关键词： Pyrolysis Methane Hydrogen Reaction kinetics Techno-economic analysis

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Predictive maintenance and its applications in civil engineering structures:A review

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Journal of Southeast University(English Edition) 2024年第3期40卷 245-256页

作者： Shan Jiazeng Zhang Xi loong Cheng Ning Liu Yanzhe Hu Xinyue College of Civil Engineering Tongji UniversityShanghai 200092China Shanghai Engineering Research Center for Resilient Cities and Intelligent Disaster Mitigation Shanghai 200092China Department of Civil and Environmental Engineering the Hong Kong University of Science and TechnologyHong Kong 999077China

Structural health monitoring and performance prediction are crucial for smart disaster mitigation and intelligent management of structures throughout their *** advancements in predictive maintenance strategies within the industrial manufacturing industry have inspired similar innovations in civil engineering,aiming to improve structural performance evaluation,damage diagnosis,and capacity *** review delves into the framework of predictive maintenance and examines various existing solutions,focusing on critical areas such as data acquisition,condition monitoring,damage prognosis,and maintenance *** from real-world applications of predictive maintenance in civil engineering,covering high-rise structures,deep foundation pits,and other infrastructure,are *** challenges of implementing predictive maintenance in civil engineering structures under current technology,such as model interpretability of data-driven methods and standards for predictive maintenance,are *** research prospects within this area are also discussed.

关键词： predictive maintenance civil engineering structural health monitoring machine learning

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Enhancing photodynamic inactivation via tunning spatial constraint on photosensitizer

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Science China Chemistry 2024年第2期67卷 652-663页

作者： Chong Li Minghao Han Ji Gao Shuxian Wang Song-Bo Lu Yaxi Li Zhao Liu Chen Zhang Zhaojin Wang Fangliang Wang Yuang Sun Chun loong Ho Kai Wang Yun Shen Kai Li Shenzhen Key Laboratory of Smart Healthcare Engineering Guangdong Provincial Key Laboratory of Advanced BiomaterialsDepartment of Biomedical EngineeringSouthern University of Science and TechnologyShenzhen518055China Department of Chemical and Environmental Engineering University of California RiversideRiverside92521USA Department of Electrical and Electronic Engineering Southern University of Science and TechnologyShenzhen518055China

The critical factor of spatial constraint,provided by the external confinement(e.g.,matrix),is often overlooked during photodynamic inactivation,despite playing a crucial role in determining the molecular photophysical process and subsequent antipathogen ***,as a proof-of-concept model,we employed two types of polymers with varying interaction energies with dopants to investigate the intrinsic relationship between spatial constraint and the essential excited-state behaviors of doped photosensitizer(4-(2-(5-(4-(diphenylamino)phenyl)thiophen-2-yl)ethyl)-1-methylquinolin-1-ium iodine,TPP).Through experimental investigation and theoretical calculations,we found that TPP tends to remain in the excited state for a shorter dwell time under weaker spatial constraints due to less restricted molecular motion in polyurethane(PU) ***,the singlet oxygen(^(1)O_(2)) generated from doped-TPP shows a 9.23-fold enhancement in PU than in the polyvinylchloride(PVC) *** light irradiation,the PU@TPP nanofiber can efficiently eliminate the coronavirus MHV-A59(≥99.9997%) at a 220,000-fold higher concentration than the infected *** antibacterial efficacy has also been demonstrated,with a killing rate of ≥99%.

关键词： photodynamic antibacterial singlet oxygen triphenylamine nanofiber

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Contents of four active components in different commercial crude drugs and preparations of Danshen (Salvia miltiorrhiza)

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Acta Pharmacologica Sinica 2002年第12期23卷 110-115页

作者： Susan Wai Sum LEUNG,Yaw loong SIOW,Ricky ying Keung MAN Department of Pharmacology Faculty of Medicine University of Hong Kong 21 Sassoon Road Hong Kong China Department of Pharmacology Faculty of Medicine University of Hong Kong 21 Sassoon Road Hong Kong China Department of Pharmacology Faculty of Medicine University of Hong Kong 21 Sassoon Road Hong Kong China Department of Pharmacology University of Hong Kong 21 Sassoon Road Hong Kong China

AIM: To detect the contents of four active components of Salvia miltiorrhiza in various commercially available danshen crude drugs and preparations. METHODS: Commercially available danshen crude drugs from different sources, as well as danshen pills and intravenous injection preparations containing danshen alone or in combination with other herbs were collected. The composition of these danshen samples was analyzed using HPLC. Specifically, the amounts of magnesium tanshinoate B (MTB), danshensu, isotanshinone IIA, and ctyptotanshinone were determined. In some of these samples, the content of MTB was further confirmed by liquid chromatography-tandem mass spectrometer (LC-MS)/MS method. RESULTS: There were great variations in the amount of the four active ingredients in the commercially available danshen crude drugs and drug preparations in this study. The amount of MTB was the highest among the four components measured in the crude drugs. However, the amounts of MTB in all danshen preparations were much

关键词： Salvia miltiorrhiza magnesium tanshinoate B (MTB) high pressure liquid chromatography

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Comparison of peripapillary retinal nerve fiber layer thickness between myopia severity groups and controls

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International Journal of Ophthalmology(English edition) 2018年第2期11卷 274-278页

作者： Evelyn Li Min tai Jiunn loong Ling Eng Hui Gan Hussein Adil Wan-Hiram Wan-Hazabbah Department of Ophthalmology School of Medical SciencesHealth CampusUniversiti Sains MalaysiaKubang Kerian 16150KelantanMalaysia Hospital Universiti Sains Malaysia Kubang Kerian 16150KelantanMalaysia

AIM： To compare the peripapillary retinal nerve fiber layer（RNFL） thickness measured via optical coherence tomography（OCT） between different groups of myopia severity and controls. METHODS： This was a prospective cross-sectional study. All subjects underwent a full ophthalmic examination, refraction, visual field analysis and A-scan biometry. Myopic patients were classified as low myopia（LM） [spherical equivalent（SE） from greater than-0.5 D, up to-3.0 D], moderate myopia（MM; SE greater than-3.0 D, up to-6.0 D） and high myopia（HM; SE greater than-6.0 D）. The control group consisted of emmetropic（EM） patients（SE from ＋0.5 D to-0.5 D）. A Zeiss Cirrus HD-OCT machine was used to measure the peripapillary RNFL thickness of both eyes of each subject. The mean peripapillary RNFL thickness between groups was compared using both analysis of variance and analysis of ***： A total of 403 eyes of 403 subjects were included in this study. The mean age was 31.48±10.23 y. There were 180（44.7%） eyes with EM, 124（30.8%） with LM, 73（18.1%） with MM and 26（6.5%） with HM. All groups of myopia severity had a thinner average RNFL than the EM group, but after controlling for gender, age, and axial eye length, only the HM group differed significantly from the EM group（P=0.017）. Likewise, the superior, inferior and nasal RNFL was thinner in all myopia groups compared to controls, but after controlling for confounders, only the inferior quadrant RNFL was significantly thinner in the HM group, when compared to the EM group（P=0.017）. CONCLUSION： The average and inferior quadrant RNFL is thinner in highly myopic eyes compared to emmetropic eyes. Refractive status must be taken into consideration when interpreting the OCT of myopic patients, as RNFL thickness varies with the degree of myopia.

关键词： optical coherence tomography retinal nerve fiber layer myopia

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Performance Analysis of Intelligent Robust Facility Layout Design

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Chinese Journal of Mechanical Engineering 2017年第2期30卷 407-418页

作者： G MOSLEMIPOUR T S LEE Y T loong Department of Industrial Engineering Payame Noor University Faculty of Engineering and Technology Multimedia University

Design of a robust production facility layout with minimum handling cost （MHC） presents an appropriate approach to tackle facility layout problems in a dynamic volatile environment, in which product demands randomly change in each planning period. The objective of the design is to find the robust facility layout with minimum total material handling cost over the entire multiperiod planning horizon. This paper proposes a new mathematical model for designing robust machine layout in the stochastic dynamic environment of manufacturing systems using quadratic assignment problem （QAP） formulation. In this investigation, product demands are assumed to be normally distributed random variables with known expected value, variance, and covariance that randomly change from period to period. The proposed model was verified and validated using randomly generated numerical data and benchmark examples. The effect of dependent product demands and varying interest rate on the total cost function of the proposed model has also been investigated. Sensitivity analysis on the proposed model has been performed. Dynamic programming and simulated annealing optimization algorithms were used in solving the modeled example problems.

关键词： Robust layout Dynamic stochastic environment Manufacturing system Dynamic programming

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A MATHEMATICAL MODEL OF ENTERPRISE COMPETITIVE ABILITY AND PERFORMANCE THROUGH EMDEN-FOWLER EQUATION (Ⅱ)

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Acta Mathematica Scientia 2013年第4期33卷 1127-1140页

作者： Meng-Rong LI Yue-loong CHANG Yu-Tso LI Department of Mathematical Sciences National Chengchi University Department of Psychology National Chengchi University Department of Aerospace and Systems Engineering Feng Chia University

In this paper we work with the ordinary equation u＇＇ - u2 （u ＋） = 0 and ob- tain some interesting phenomena concerning, blow-up, blow-up rate, life-span of solutions to those equations.

关键词： estimate life-span blow-up blow-up rate performance competitive ability

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Effects of overburden, rock strength and pillar width on the safety of a three-parallel-hole tunnel

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Journal of Zhejiang University-Science A(Applied Physics & Engineering) 2009年第11期10卷 1581-1588页

作者： Shong-loong CHEN Guo-wei LI Meen-wah GUI Department of Civil Engineering National Taipei University of Technology Taipei Department of Civil Engineering National Chiao-Tung University Hsinchu

During the excavation of three-parallel-hole tunnel, the tunnel might collapse due to over-stress as a result of inadequate rock pillar width. Treating the rock overburden depth, rock strength, and rock pillar width as variables, a series of 3D numerical analysis was carried out to examine the effect of each variable on the safety of the tunnel, in particular the rock pillar. A stress strength ratio (SSR) was used to define whether the safety of the rock pillar was exceeded. A simple design chart for the case of three-parallel-hole tunnel, which took into account the influence of overburden depth, rock pillar width, and rock strength, was also proposed for used in the preliminary design stage.

关键词： Three-parallel-hole tunnel Tunnels interaction Rock pillar Numerical analysis Stress strength ratio (SSR)

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