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Functionalized graphene oxide-reinforced electrospun carbon nanofibers as ultrathin supercapacitor electrode

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Journal of Energy Chemistry 2017年第4期26卷 790-798页

作者： W.K.chee H.N.lim Y.Andou Z.Zainal A.A.B.Hamra I.Harrison M.Altarawneh Z.T.Jiang N.M.Huang Department of Chemistry Faculty of ScienceUniversiti Putra Malaysia Functional Device Laboratory Institute of Advanced TechnologyUniversiti Putra Malaysia Graduate School of Life Science and Systems Engineering Eco-Town Collaborative R&D Center for the Environment and RecyclingKyushu Institute of Technology Department of Electrical and Electronic Engineering Faculty of EngineeringUniversity of Nottingham Surface Analysis and Materials Engineering Research Group School of Engineering and Information TechnologyMurdoch University Faculty of Engineering Xiamen University of Malaysia

Graphene oxide has been used widely as a starting precursor for applications that cater to the needs of tunable graphene. However, the hydrophilic characteristic limits their application, especially in a hydrophobic condition. Herein, a novel non-covalent surface modification approach towards graphene oxide was conducted via a UV-induced photo-polymerization technique that involves two major routes; a UV-sensitive initiator embedded via pi-pi interactions on the graphene planar rings, and the polymerization of hydrophobic polymeric chains along the surface. The functionalized graphene oxide successfully achieved the desired hydrophobicity as it displayed the characteristic of being readily dissolved in organic solvent. Upon its addition into a polymeric solution and subjected to an electrospinning process,non-woven random nanofibers embedded with graphene oxide sheets were obtained. The prepared polymeric nanofibers were subjected to two-step thermal treatments that eventually converted the polymeric chains into a carbon-rich conductive structure. A unique morphology was observed upon the addition of the functionalized graphene oxide, whereby the sheets were embedded and intercalated within the carbon nanofibers and formed a continuous structure. This reinforcement effectively enhanced the electrochemical performance of the carbon nanofibers by recording a specific capacitance of up to 140.10 F/g at the current density of 1 A/g, which was approximately three folds more than that of pristine *** also retained the capacitance up to 96.2% after 1000 vigorous charge/discharge cycles. This functionalization technique opens up a new pathway in tuning the solubility nature of graphene oxide towards the synthesis of a graphene oxide-reinforced polymeric structure.

关键词： Non-covalent functionalization Functionalized graphene oxide Electrospinning Carbon nanofiber Supercapacitor electrode

The quality of escalator signage for public safety in Malaysia:an observational study

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Global Health Journal 2021年第4期5卷 198-203页

作者： Chii-Chii Chew chee-Tao Chang Xin-Jie lim Hasni-Adha Ibrahim Hamiazwa Azmi Nur-Ilyana Wahabi Nur-Shuhaida Hamdan Nurul-Atiqah Nazan Nur-Haliana Karim Nurfarahdila-Ahmad Malawi Ying-Ling Oon Norshazila-Julia MS Amar-Singh HSS Clinical Research Center Hospital Raja Permaisuri BainunLevel 4Ambulatory Care CenterJalan Raja Ashman ShahIpohPerak 30450Malaysia Allied Health Science College Sultan Azlan Shah Ministry of HealthTanjong RambutanIpohPerak Darul Ridzuan 31250Malaysia Department of Paediatric Hospital Raja Permaisuri BainunMinistry of HealthJalan Raja Ashman ShahIpohPerak 30450Malaysia

Objective:Escalator signage could be playing a vital role to alert users for safe use of *** study aimed to evaluate the availability,standardization,and content of safety information on escalator signage in the shopping ***:An observational study was conducted from November 2017 to February 2018 to assess the availability,standardization of safety information among the signage inside the shopping mall,and the content of safety information for public safety in Malaysia.A checklist was developed by adapting escalator safety guidelines from seven countries and regions including *** collctors identified from the selected states were required to capture three photographs at different angles of the escalator signage for each ascending and descending directions at each entrance of the *** analysis was performed;each criterion was presented in frequency and ***:A total of 268 escalators from 84 shopping malls in 9 states of Malaysia were *** operating escalators were not equipped with *** than one-ifth(23.0%)of the signage was not standardized within the *** majority of safety information was displayed in the form of a pictogram,a minority of signage displayed information in both pictogram and text format:"children must hold hand"(12.7%)and"be careful of long clothing"(10.8%),***,"toddlers should be carried"(8.6%)and"take extra care with rubber shoes/tied shoes/laces"(30.2%)were found absent in most of the ***:Escalator signage was present in almost all of the escalators ***,non-standardization of the signage of escalators should warrant the attention of relevant authorities to revise the safety guideline s and improve the quality of escalator.

关键词： Elevators and escalators Safety Transportation facilities Environment and public health Malaysia

集成了500V启动单元的ICE3BS02离线开关电源电流模式控制器

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电子设计应用 2004年第5期 118-119页

作者： lim chee Siong Simon Jeoh Meng Kiat Infineon公司

概述ICE3BS02是开关电源电流控制脉宽调制器.它尤其适用于LCD显示器、打印机和笔记本电脑的适配器、DVD播放器、机顶盒及工业辅助电源的AC/DC电源.本文将介绍此款IC的特点.

关键词： ICE3BS02 开关电源电流控制脉宽调制器 “主动”间歇模式自动重启模式过压保护输出过载保护系统开环保护

The Efficacy of Plant-Based Ionizers in Removing Aerosol for COVID-19 Mitigation

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Research 2021年第1期2021卷 70-80页

作者： Ady Suwardi Chin Chun Ooi Dan Daniel chee Kiang Ivan Tan Hongying Li Ou Yang Zhong Liang Yuanting Karen Tang Jing Yee chee Anton Sadovoy Shu-Ye Jiang Srinivasan Ramachandran Enyi Ye Chang Wei Kang Wun Chet Davy Cheong Keng Hui lim Xian Jun Loh Institute of Materials Research and Engineering 2 Fusionopolis WayAgency for ScienceTechnology and ResearchSingapore 138634 Institute of High Performance Computing 1 Fusionopolis WayAgency for ScienceTechnology and ResearchSingapore 138632 Temasek Life Sciences Laboratory 1 Research LinkNational University of SingaporeSingapore 117604

Small-sized droplets/aerosol transmission is one of the factors responsible for the spread of COVID-19,in addition to large droplets and surface contamination(fomites).While large droplets and surface contamination can be relatively easier to deal with(i.e.,using mask and proper hygiene measures),aerosol presents a different challenge due to their ability to remain airborne for a long *** calls for mitigation solutions that can rapidly eliminate the airborne ***-COVID-19,air ionizers have been touted as effective tools to eliminate small *** this work,we sought to evaluate the efficacy of a novel plant-based ionizer in eliminating *** was found that factors such as the ion concentration,humidity,and ventilation can drastically affect the efficacy of aerosol *** aerosol removal rate was quantified in terms of ACH(air changes per hour)and CADR-(clean air delivery rate-)equivalent unit,with ACH as high as 12 and CADR as high as 141 ft^(3)/minute being achieved by a plant-based ionizer in a small isolated *** work provides an important and timely guidance on the effective deployment of ionizers in minimizing the risk of COVID-19 spread via airborne aerosol,especially in a poorly-ventilated environment.

关键词： aerosol eliminate sized

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基于高频电阻抗信号的结构损伤监测

浙江大学学报（工学版） 2007年第1期41卷 6-11页

作者：严蔚陈伟球林志华蔡金标浙江大学土木工程学系浙江杭州310027 香港城市大学建筑系

给出了利用高频电阻抗信号进行结构损伤识别的精确定量分析方法.考察压电片-黏结层-主体结构组成的一个耦合结构系统,主体结构采用一维模型并只考虑轴向振动,引入剪滞模型来描述压电片与主体结构之间的剪力传递,考虑压电片的动力效应,... 详细信息

给出了利用高频电阻抗信号进行结构损伤识别的精确定量分析方法.考察压电片-黏结层-主体结构组成的一个耦合结构系统,主体结构采用一维模型并只考虑轴向振动,引入剪滞模型来描述压电片与主体结构之间的剪力传递,考虑压电片的动力效应,采用传递矩阵法导出了这一耦合结构的系统方程,得到了压电片电导纳的解析表达式.通过算例验证了所给出方法的正确性和有效性.计算结果表明,弱界面对电阻抗信号有较大的影响,利用电导纳的虚部可以清楚地检测到界面的弱黏结;采用电阻抗技术能够很好地识别结构局部的细小损伤.

关键词：损伤识别电阻抗法剪滞模型传递矩阵法

SRS27,a semisynthetic diterpenoid lactone,inhibits airway inflammation and hyper-responsiveness via NF-κB pathway in an allergic mouse asthma model

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中国药理学与毒理学杂志 2015年第S1期29卷 53-53页

作者： Jonathan chee Woei lim Fera Yiqian GOH Sreenivasa Rao SAGINEEDU Audrey chee Hui YONG Shiran Mohd SIDIK Nordin Haji LAJIS Wai-Shiu Fred WONG Johnson STANSLAS Pharmacotherapeutics Unit Department of MedicineFaculty of Medicine and Health SciencesUniversiti Putra Malaysia Department of Pharmacology Yong Loo Lin School of MedicineNational University Health System Laboratory of Natural Products Institute of BioscienceUniversiti Putra Malaysia Faculty of Pharmacy Segi University College 9Jalan Teknologi Histopathology Unit Department of PathologyFaculty of Medicine and Health SciencesUniversiti Putra Malaysia Immunology Program Life Science InstituteNational University of Singapore

Andrographis paniculata contains two main diterpenoid constituents,andrographolide(AGP)and 14-deoxy-11,12-didehydroandrographolide(DDAG),which were found to exhibit antiasthma effects in a mouse asthma ***,due to inadequacies of both compounds in terms of drug-likeness,DDAG analogues were semisynthesised to tackle these *** objective of the study was to investigate the potential of DDAG analogues as new antiasthma *** the analogues,(SRS27)was proven to inhibit cysteinyl leukotrienes(CysLT)and nitric oxide(NO)synthesis in mouse macrophages,like ***,on the other hand,failed to exhibit such ***27 is less cytotoxic than AGP,suggests that a simple chemical modification of DDAG produces a compound with CysLT and NO inhibitory activites similar to AGP while maintaining toxicity profile similar to *** is interesting to note that other analogues such as SRS28,SRS49,SRS76 and SRS83 with chemical modifications on the same carbon numbers 3 and 19 of DDAG were unable to show inhibition of CysLT and NO ***,the potential anti-inflammatory effect of SRS27 was investigated in ovalbumin(OVA)-induced mouse asthma *** compound was administered in a prophylactic manner and showed a substantial decrease in mouse asthma model ***27 at 3mg·kg-1 significantly reduced OVA-induced total cell such as macrophages,eosinophils,lymphocytes and neutrophils,as well as inflammatory cytokines such as IL-4,IL-5,IL-13 and eotaxin in bronchoalveolar lavage BAL *** compound also suppressed serum IgE *** addition,SRS27 suppressed mucus hyper-secretion and expression of inflammatory mediators such as TNF-α,MCP-1,Muc5 ac,RANTES,IL-33 and ***27 is the first known DDAG derivative tested positive in mouse asthma model and as such SRS27 could serve as a prototype prophylactic agent.

关键词： NF-κB A549cell line andrographolide analogues nitr

Prediction of Postbuckling Characteristics of Perforated Metamaterial Cylindrical Shells Under Axial Compression

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Acta Mechanica Solida Sinica 2023年第3期36卷 428-442页

作者： Xueqing Cao Jianyi Guo Yongqi Li Qifeng Zhang Zhenhuan Zhou Jiabin Sun Xinsheng Xu C.W.lim State Key Laboratory of Structural Analysis for Industrial Equipment and School of Ocean Science and Technology Dalian University of TechnologyPanjin 124221China AVIC Jonhon Optronic Technology Co. Ltd.Luoyang 471003China State Key Laboratory of Structural Analysis for Industrial Equipment and Department of Engineering Mechanics Dalian University of TechnologyDalian 116024China Department of Architecture and Civil Engineering City University of Hong KongTat Chee AvenueKowloonHong KongChina

Large deflection postbuckling responses of metamaterial cylindrical shells perforated by arrayed circular holes are investigated through a newly proposed theoretical model incorporating with finite element method and *** triggering of an unusual pattern transformation under compressive load(that shows special hyperelastic metamaterial characteristics)contributes to the particularity of the postbucklingmodes,in which the axisymmetric waisted and non-axisymmetric postbuckling configurations of perforated cylindrical shells are *** transformations of postbucking modes are mainly affected by global outline sizes of the shell and local geometrical parameters of *** structural load-carrying capacity for the waisted postbuckling response suffers a sudden drop and recovers when the holes ***,the shell would undergo a sustained fall off under non-axisymmetric postbuckling *** negative Poisson’s ratio induced by pattern transformation plays a key role and a critical effective threshold value exists,inducing the waisted postbuckling *** revealed principles would be of benefit for achieving a controllable structural stability that is usually difficult to implement on those conventional structures.

关键词： Cylindrical shell Negative Poisson’s ratio Postbuckling Waisted deformation

One-step synthesis of amine-coated ultra-small mesoporous silica nanoparticles

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Nano Research 2020年第6期13卷 1592-1596页

作者： Mingyue Cui Christian Wiraja lim Wei Qi Sharon Chew Wan Ting Deblin Jana Mengjia Zheng Xiao Hu Chenjie Xu Nanyang Environment&Water Research Institute Interdisciplinary Graduate ProgrammeNanyang Technological UniversitySingapore637141Singapore School of Chemical and Biomedical Engineering Nanyang Technological UniversitySingapore637457Singapore School of Materials Science and Engineering Nanyang Technological UniversitySingapore639798Singapore Division of Chemistry and Biological Chemistry School of Physical and Mathematical SciencesNanyang Technological UniversitySingapore637371Singapore National Dental Centre of Singapore 5 Second Hospital AveSingapore168938Singapore Department of Biomedical Engineering City University of Hong Kong83 Tat Chee AvenueKowloonHong KongChina

Silica nanoparticles have been studied extensively in biomedical field due to their high biocompatibility,controllable morphology and so *** can be used both as the drug carrier and imaging ***,an aminated ultra-small silica nanoparticle based system is developed with various *** molecules including fluorophore,folic acid,and antibody are coupled to this system to achieve specific applications such as bacterial/cell labelling and recognition.

关键词： silica nanoparticles one-step synthesis surface modification bacterial&cell labelling

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弹性梁非线性热屈曲行为与辛本征解展开方法

大连理工大学学报 2011年第1期51卷 1-6页

作者：褚洪杰徐新生林志华江南马建青大连理工大学工业装备结构分析国家重点实验室辽宁大连116024 香港城市大学建筑系

基于Hamilton体系,研究了弹性梁在温度荷载下发生的前屈曲和后屈曲问题.在辛空间中,前屈曲问题和后屈曲问题分别归结于系统的零本征值问题和非零本征值问题,而结构屈曲的临界温度和屈曲模态对应Hamilton体系的广义本征值和本征解.采用... 详细信息

基于Hamilton体系,研究了弹性梁在温度荷载下发生的前屈曲和后屈曲问题.在辛空间中,前屈曲问题和后屈曲问题分别归结于系统的零本征值问题和非零本征值问题,而结构屈曲的临界温度和屈曲模态对应Hamilton体系的广义本征值和本征解.采用辛本征解展开方法对非线性大变形的后屈曲问题进行了深入探讨,揭示了从前屈曲到后屈曲变化的整个过程.结果发现梁在屈曲变形过程中向一个特殊的模式过渡,并最终发展为梁在某一平衡位置作周期振荡.

关键词： Hamilton体系弹性梁热屈曲大变形