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A low power 50Hz argon plasma for surface modification of polytetrafluoroethylene

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Plasma Science and Technology 2022年第11期24卷 1-13页

作者： Yen Theng LAU Wee Siong CHIU Hong Chun LEE Haw Jiunn WOO oi hoong chin Teck Yong TOU Department of Physics Faculty of ScienceUniversity of MalayaKuala Lumpur 50603Malaysia Faculty of Engineering Multimedia UniversityPersiaran CyberjayaCyberjaya 63100Malaysia

The characteristics of a low power 50 Hz argon plasma for surface treatment of polytetrafluoroethylene(PTFE)film is presented in this *** current–voltage behavior of the discharge and time-varying intensity of the discharge showed that a DC glow discharge was generated in reversed polarity at every *** discharge power between 0.5 and 1 W,the measured electron temperature and density were 2–3 eV and∼10^(8) cm^(−3),*** optical emission spectrum of the argon plasma showed presence of some‘impurity species’such as OH,N_(2) and H,which presumably originated from the residual air in the discharge *** exposure of PTFE films to the argon glow plasma at pressure 120 Pa and discharge power 0.5 to 1 W,the water contact angle reduced by 4%to 20%from the original 114°at pristine condition,which confirms improvement of its surface *** increase in wettability was attributed to incorporation of oxygen-containing functional groups on the treated surface and concomitant reduction in fluorine as revealed by the XPS analysis and increase in surface roughness analyzed from the atomic force *** upon storage in ambient air showed retention of the induced increase in surface wettability.

关键词： 50 Hz glow discharge plasma surface treatment PTFE hydrophobic recovery ageing effect

A Review of Graphene Oxide Crosslinking as Enhanced Corrosion Shield Application

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Journal of Renewable Materials 2023年第6期11卷 2745-2770页

作者： Nurul Anis Athirah Ab Aziz chin Wei Lai Boon hoong Ong Nanotechnology&Catalysis Research Centre Institute for Advanced StudiesUniversity of MalayaKuala Lumpur50603Malaysia

Nowadays,corrosion is not only undesirable,but it also has a significant influence on the industrial sectors and technical innovations that have demand for *** global economic damage is expected to reach$2.5 trillion,equivalent to more than 3.4%of the world’s GDP in *** is linked with significant financial harm,manufacturing pollution,and safety *** electrochemical process primarily induces metal corrosion at the metalelectrolyte interface region,caused by steel oxidation and the reduction of oxygen,protons,and ***,organic and epoxy coatings can be applied as protective ***,it can prevent metal corrosion in various fields due to its unique properties,like the ability to manage its curing process over a long *** review paper focuses on improving the physicomechanical properties of modified graphene oxide(GO)coating by attaching a polymer,epoxy resin(EP).Moreover,we reviewed recent achievements for different methods in minimizing a corrosion ***,we considered the modification of epoxy resin using the curing agent as a bridge to the polymer to strengthen the functionalization of nanocomposites during the ***,we discussed the relationship between the modified GO/EP anticorrosive coating and physicomechanical properties since it is currently being questioned and remains *** a result,extensive studies on the mechanism of synthesis of the modified GO/EP anticorrosive coating were highlighted.

关键词： Corrosion anticorrosive graphene polymer epoxy resins

A Mini Review: Can Graphene Be a Novel Material for Perovskite Solar Cell Applications?

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Nano-Micro Letters 2018年第2期10卷 92-103页

作者： Eng Liang Lim Chi chin Yap Mohammad Hafizuddin Hj Jumali Mohd Asri Mat Teridi chin hoong Teh School of Applied Physics Faculty of Science and Technology Universiti Kebangsaan Malaysia Solar Energy Research Institute Universiti Kebangsaan Malaysia ASASI Pintar Program Pusat Permata Pintar NegaraUniversiti Kebangsaan Malaysia

Perovskite solar cells(PSCs) have raised research interest in scientific community because their power conversion efficiency is comparable to that of traditional commercial solar cells(i.e., amorphous Si, GaAs,and CdTe). Apart from that, PSCs are lightweight, are flexible, and have low production costs. Recently, graphene has been used as a novel material for PSC applications due to its excellent optical, electrical, and mechanical properties. The hydrophobic nature of graphene surface can provide protection against air moisture from the surrounding medium, which can improve the lifetime of devices. Herein, we review recent developments in the use of graphene for PSC applications as a conductive electrode,carrier transporting material, and stabilizer material. By exploring the application of graphene in PSCs, a new class of strategies can be developed to improve the device performance and stability before it can be commercialized in the photovoltaic market in the near future.

关键词： Perovskite solar cells Graphene Conductive electrode Carrier transporting material Stabilizer material Performance and stability

Evaluation and Improvement of Roundabouts in Changchun

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World Journal of Engineering and Technology 2016年第3期4卷 40-50页

作者： Mo Zhou Lili Yang hoong Chor chin Department of Civil & Environmental Engineering National University of Singapore Singapore City Singapore Institute of Transportation Jilin University Changchun China

In Changchun, china, roundabouts are fairly common. They are often designed to connect the main roads because of their ability to reduce conflict points, making them safer than other intersections. They can also beautify the city when the central islands are landscaped. However, with increasing traffic, they may not function well and may even paralyze the road network. This means that it is important to evaluate the performance of roundabouts promptly, and to make necessary improvements if required. Using several roundabouts in Changchun as case studies, this article uses V/C ratio and delay to evaluate roundabout performance. Based on the result of evaluation, the micro-simulation model of the poorly-performing roundabout is built and enhancement is proposed.

关键词： Roundabouts V/C Ratio and Delay Evaluation Traffic Simulation AIMSUN

Hypoxia increases adipogenesis and affects adipocytokine production in orbital fibroblasts-a possible explanation of the link between smoking and Graves' ophthalmopathy

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International Journal of Ophthalmology(English edition) 2014年第3期7卷 403-407页

作者： Chiaw Ling Chng oi Fah Lai Charmaine Sze-Min Chew Yu Pei Peh Stephanie Man-Chung Fook-Chong Lay Leng Seah Daphne Hsu-chin Khoo Department of Endocrinology Singapore General HospitalLevel 3 the Academia 20 College Road 169856 Singapore Department of Clinical Research Academia Discovery Tower Level 9 Research Office 2 20 College Road 169856Singapore Oculoplastic/Aesthetic Eyeplastic Service Singapore National Eye Centre 11 Third Hospital Avenue 168751Singapore

AIM:To assess the effects of hypoxia on human orbital fibroblasts(OF)on adipogenesis and adipocytokine ***:Human OF were derived from tissues obtained from patients with Graves’ophthalmopathy(GO)and from patients without known thyroid diseases undergoing *** OF were cultured separately under normoxic and hypoxic *** of adipocytokine concentrations using multiplex ELISA and lipid accumulation in the cells using oil Red O staining were subsequently ***:There was increased adipogenesis in OF from GO subject when exposed to hypoxic culture *** was not observed in OF from normal *** led to an increase in leptin and a decrease in MCP-1 secretion in OF ***:Hypoxia induces adipogenesis in OF and may represent a mechanism by which smoking contributes to deterioration of *** also found novel changes to leptin and MCP-1 production in OF cultures exposed to hypoxia suggesting important roles of these cytokines in the disease process.

关键词： hypoxia smoking Graves' ophthalmopathy

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改进的堆石坝变形计算参数敏感性分析方法

河海大学学报（自然科学版） 2017年第5期45卷 406-412页

作者：陈辉刘东海戚蓝天津大学水利工程仿真与安全国家重点实验室天津300072

为提高邓肯-张E-B模型计算堆石坝变形的精度,提出基于全域有限元计算节点的单因素分析方法和基于双判别方式的正交试验方法,分析大坝变形对坝料密度和模型参数的敏感性,确定大坝变形计算的主要影响参数。实例分析表明,φ_0、K_b、ρ、R_... 详细信息

为提高邓肯-张E-B模型计算堆石坝变形的精度,提出基于全域有限元计算节点的单因素分析方法和基于双判别方式的正交试验方法,分析大坝变形对坝料密度和模型参数的敏感性,确定大坝变形计算的主要影响参数。实例分析表明,φ_0、K_b、ρ、R_f、K等对大坝变形的影响显著,故需重点研究这5个参数在空间上的差异性。该研究方法解决了传统单因素分析方法样本缺乏代表性的弊端,可以定量给出参数敏感性的显著性水平,提高了敏感性分析的全面性和准确性,可为堆石坝变形精细分析时合理选择需进行空间赋值的模型参数提供依据。

关键词：堆石坝大坝变形邓肯-张模型模型参数敏感性分析正交试验法

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棉田棉铃虫卵抽样技术比较

昆虫学报 1987年第1期30卷 68-74页

作者：丁岩钦中国科学院动物研究所

本文对棉田棉铃虫卵抽样技术从两方面进行了比较,一系估值抽样方面:文中应用了简单随机抽样、阶层抽样、阶层抽样序贯估值与零频率抽样四种方法,并以估值的可靠性、代表性误差与抽样时间消耗三个指标进行了综合比较,结果认为以阶层抽样... 详细信息

本文对棉田棉铃虫卵抽样技术从两方面进行了比较,一系估值抽样方面:文中应用了简单随机抽样、阶层抽样、阶层抽样序贯估值与零频率抽样四种方法,并以估值的可靠性、代表性误差与抽样时间消耗三个指标进行了综合比较,结果认为以阶层抽样最佳。另一系风险决策抽样:本文应用了未着卵株的序贯抽样、阶层抽样、零频率抽样三种方法进行了综合比较,结果认为序贯抽样最佳,但若与零频率抽样相结合就既可迅速地作出风险决策又可获得虫口密度的信息。

关键词：棉铃虫抽样方法

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一种可变远距离大功率激光聚焦系统的设计

激光与光电子学进展 2018年第6期55卷 382-388页

作者：胡明勇封志伟范二荣赵奇李明杰合肥工业大学光电技术研究院安徽合肥230000

基于初级像差理论,将卡式系统与前端透镜组相结合,设计了一种可变远距离大功率激光聚焦光学系统。目标物体在500~5000m范围内变化时,通过调节前端透镜组到卡式系统的距离来改变焦面位置,实现对聚焦光斑大小的控制;通过透镜组的位置可反... 详细信息

基于初级像差理论,将卡式系统与前端透镜组相结合,设计了一种可变远距离大功率激光聚焦光学系统。目标物体在500~5000m范围内变化时,通过调节前端透镜组到卡式系统的距离来改变焦面位置,实现对聚焦光斑大小的控制;通过透镜组的位置可反推出不同的目标距离。使用Zemax光学软件对初始结构进行优化,设计结果表明,在不同目标距离下,光斑大小均能满足设计指标要求。

关键词：光学设计高斯光束折反系统变焦系统

地佐辛对β淀粉样多肽处理的原代大鼠皮质星形胶质细胞的保护作用

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临床麻醉学杂志 2018年第2期34卷 175-178页

作者：张立民李睿孙文波王琦河北省沧州市中心医院麻醉科 061000

目的探讨地佐辛对接受β淀粉样多肽处理的原代大鼠皮质星形胶质细胞的影响以及与超极化激活的环核苷酸门控(hyperpolarization-activated cyclic nucleotide-gated,HCN)通道的关系。方法出生24 h内的SD大鼠,体外培养皮质星形胶质细胞并... 详细信息

目的探讨地佐辛对接受β淀粉样多肽处理的原代大鼠皮质星形胶质细胞的影响以及与超极化激活的环核苷酸门控(hyperpolarization-activated cyclic nucleotide-gated,HCN)通道的关系。方法出生24 h内的SD大鼠,体外培养皮质星形胶质细胞并接种于培养瓶或35 mm培养皿,采用随机数字表法分为七组(n=5)。ZA组和CDA组预先24 h分别向培养基中加入HCN通道激动剂7-CHc AMP(30μmol/L)和阻断剂ZD7288(30μmol/L),随后DA1、DA2、DA3和CDA组分别向培养基中加入地佐辛10^(-7)、10^(-6)、10^(-5)和10^(-6)mmol/L孵育24 h,最后A、DA1、DA2、DA3、ZA和CDA组分别向培养基中加入Aβ1-42(15μmol/L)孵育24 h作为β淀粉样多肽处理,而对照组(C组)细胞正常培养。按照各组处理收集星形胶质细胞,采用Annexin V-FITC/PI双染色-流式细胞法测定细胞凋亡率,乳酸脱氢酶(LDH)法测定细胞损伤率,ELISA法测定细胞前炎性因子IL-1β浓度,Western blot法测定细胞内Cu/Zn-SOD和Mn-SOD蛋白含量。结果与C组比较,A组星形胶质细胞凋亡率、损伤率和IL-1β浓度明显升高(P<0.05);与A组比较,DA2、DA3和ZA组星形胶质细胞凋亡率、损伤率和IL-1β浓度明显下降,Cu/Zn-SOD和Mn-SOD蛋白含量明显升高(P<0.05);与CDA组比较,DA2、DA3和ZA组星形胶质细胞凋亡率、损伤率和IL-1β浓度明显下降,Cu/Zn-SOD和Mn-SOD蛋白含量明显升高(P<0.05)。结论地佐辛抑制β淀粉样多肽诱发的原代大鼠皮质星形胶质细胞凋亡的机制可能与HCN通道开放被抑制后,抗氧化应激相关蛋白Cu/Zn-SOD和Mn-SOD含量增加相关。

关键词：地佐辛星形胶质细胞氧化应激凋亡