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Tribological properties of platinum/ruthenium/nitrogen doped diamond-like carbon thin films deposited with different negative substrate biases

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Friction 2014年第4期2卷 317-329页

作者： Nay Win khun Erjia LIU School of Mechanical and Aerospace Engineering Nanyang Technological University50 Nanyang AvenueSingapore 639798Singapore

The platinum/ruthenium/nitrogen doped diamond‐like carbon(PtRuN‐DLC)thin films were deposited on Si substrates via DC magnetron sputtering by varying negative substrate *** tribological performance of the PtRuN‐DLC films was systematically investigated using ball‐on‐disc microtribological *** Raman results showed that the increased negative substrate bias significantly increased the number of sp3 bonds in the PtRuN‐DLC films as a result of the increased kinetic energies of impinging *** adhesion strength of the PtRuN‐DLC films apparently decreased with increased negative substrate bias due to the promoted residual stress in the *** tribological results clearly revealed that the increased negative substrate bias decreased the friction and wear of the PtRuN‐DLC films by improving the sp3 bonded cross‐linking structures of the *** can be concluded that the PtRuN‐DLC films could effectively prevent their underlying Si substrates from wear as the negative substrate bias had a significant influence on the tribological properties of the PtRuN‐DLC films.

关键词： DC magnetron sputtering PtRuN‐DLC film adhesion friction wear

Effects of platinum content on tribological properties of platinum/nitrogen doped diamond-like carbon thin films deposited via magnetron sputtering

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Friction 2014年第1期2卷 64-72页

作者： Nay Win khun Erjia LIU School of Mechanical and Aerospace Engineering Nanyang Technological University50 Nanyang AvenueSingapore 639798Singapore

Platinum(Pt)and nitrogen(N)were co-incorporated in diamond-like carbon(DLC)thin films using a magnetron sputtering system to form PtN-DLC thin films for tribological *** Pt content in the PtN-DLC films prepared on Si substrates was controlled by varying RF power applied to a Pt target at a fixed N2 flow *** tribological properties of the PtN-DLC films were investigated with respect to the Pt content in the *** uncoated Si substrate surface tested against a steel ball of 6 mm in diameter had significant abrasive and fatigue wear,while no significant wear was found on the N-DLC coated sample surface,indicating that the N-DLC film effectively prevented its underlying Si substrate from ***,the incorporation of Pt in the N-DLC films reduced the wear resistance of the films by degrading sp3-bonded cross-linking structures of the films so that significant wear tracks were found on the surfaces of the PtN-DLC ***,the increased radio frequency(RF)power applied to the Pt target decreased the wear resistance of the PtN-DLC films as a result of the increased Pt content.

关键词： diamond-like carbon(DLC)film Pt and N doping friction wear

Mechanical and tribological properties of epoxy matrix composites modified with microencapsulated mixture of wax lubricant and multi-walled carbon nanotubes

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Friction 2013年第4期1卷 341-349页

作者： Nay Win khun He ZHANG Jinglei YANG Erjia LIU School of Mechanical and Aerospace Engineering Nanyang Technological University50 Nanyang AvenueSingapore 639798Singapore

The mechanical and tribological properties of epoxy composites modified with microencapsulated wax lubricant and multi-walled carbon nanotubes(MWCNTs)were *** increased soft microcapsules embedded in the epoxy matrices were responsible for the reduced micro-hardness and Young’s modulus of the epoxy *** was found that the friction of the epoxy composites greatly decreased with increased microcapsule content due to combined lubricating effects of the both wax lubricant and *** a result,the wear of the epoxy composites apparently decreased with increased microcapsule content.

关键词： epoxy composite microcapsule wax lubricant MWCNT tribology

Knowledge,attitudes and practices towards avian influenza A(H5N1) among Cambodian women:A cross-sectional study

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Asian Pacific Journal of Tropical Medicine 2012年第9期5卷 727-734页

作者： Mav khun Chantha Heng Md.Harun-Or-Rashid Hideki Kasuya Junichi Sakamoto Young Leaders' Program in Healthcare Administration Nagoya University Graduate School of MedicineNagoyaJapan Communicable Disease Control Rapid Response TeamKampot Provincial Health DepartmentKampot ProvinceCambodia Department of Surgery Ⅱ Nagoya University Graduate School of MedicineNagoyaJapan

Objective:To measure highly pathogenic avian influenza(HPAI)-related knowledge,attitudes, and practices(KAPs) among Cambodian ***:This cross-sectional study selected 246 married women aged between 18-55 years who had backyard poultry and lived at least one year in the areas of the survey through multi-stage cluster *** average score of correct answers was generated to evaluate respondents’ knowledge(Good/Poor).attitudes(Positive/ Negative),and practices(Good/Bad).Results:We reported that about half of the respondents had good knowledge and good practices and four-fifth of them had positive attitudes towards *** ratios(ORs) and 95%confidence intervals(CIs) were estimated through a logistic regression model to explore contributing factors that raise their KAP *** of the sources were significant in increasing knowledge of the respondent,like television(OR=l.6.95%CI=1.0- 2.7),radio(OR=2.5.95%CI=l.3-4.9).leaflets/booklets(OR=2.1,95%CI=1.2-3.9),school students (OR=18.4.95%CI=2.4-142.9).village health volunteers(OR=4.5.95%CI=2.2-10.9) *** such as television(OR=3.7.95%CI=2.1-6.4).leaflets/booklets(OR=2.6,95%CI7=1.4-5.1).and public health staff(OR=2.2,95%CI=1.2-4.1) had similar influence on ***,we found similar effect on raising the attitudes of the responded,it was not ***: We report a satisfactory level of positive attitudes,and moderate level of knowledge and practices related to HPAI among Cambodian *** KAPs through television,radio and other medias may be more efficient than using usual information,education and communication materials to prevent HPAI.

关键词： Highly pathogenic avian influenza Knowledge Attitudes Practices Kampot Cambodia

Tribological properties of short carbon fibers reinforced epoxy composites

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Friction 2014年第3期2卷 226-239页

作者： Nay Win khun He ZHANG Lee Hoon LIM Chee Yoon YUE Xiao HU Jinglei YANG School of Mechanical and Aerospace Engineering 2School of Materials Science and EngineeringNanyang Technological University50 Nanyang AvenueSingapore 639798Singapore

Short carbon fiber(SCF)reinforced epoxy composites with different SCF contents were developed to investigate their tribological *** friction coefficient and wear of the epoxy composites slid in a circular path against a steel pin inclined at 45°to a vertical axis and a steel ball significantly decreased with increased SCF content due to the solid lubricating effect of SCFs along with the improved mechanical strength of the *** scanning electron microscope(SEM)observation showed that the epoxy composites had less sensitive to surface fatigue caused by the repeated sliding of the counterparts than the *** tribological results clearly showed that the incorporation of SCFs was an effective way to improve the tribological properties of the epoxy composites.

关键词： epoxy composite short carbon fiber friction wear

A review on current and future advancements for commercialized microalgae species

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Food Science and Human Wellness 2022年第5期11卷 1156-1170页

作者： Jia Fei Wong Hui Jing Hong Su Chern Foo Michelle Khai khun Yap Ji Wei Tan School of Science Monash University MalaysiaBandar Sunway 47500Malaysia

Microalgae are unicellular photosynthetic microorganisms that are commonly found in saline or freshwater *** the years,microalgae represent promising sources of sustainable bioactivities with past literatures reflecting a growing interest in algae-based dietary supplements in the form of whole ***,the bioactive molecules that can be identified and extracted in microalgae have scientifically proven to contain therapeutic properties which can be beneficial to human *** the increasing occurrence of global health threats such as antimicrobial resistance and cancer,this has resulted in considerable attention for microalgae study especially in the medicinal *** studies have proved the therapeutic potentials of high-value bioproducts in microalgae,however,there is still room to understand their potential therapeutic properties on humans’health,discovering novel microalgae-derived bioactive compounds,as well as translating the lab-based evidence to clinical trial *** review will focus on accessing the biochemical compositions of commercialised microalgae species from 2007 to 2020,and the activity of their biologically active molecules in eliciting selected therapeutic potentials which are anti-oxidative,anti-inflammatory,anti-microbial and anti-cancer *** review article will also be looking at the research gaps in addition to the above four major selected therapeutic potentials,and future prospective.

关键词： Commercialized microalgae Antioxidant Anti-inflammation Antimicrobial Anticancer

Effects of deep cryogenic treatment on mechanical and tribological properties of AISI D3 tool steel

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Friction 2015年第3期3卷 234-242页

作者： Nay Win khun Erjia LIU Adrian Wei Yee TAN D.SENTHILKUMAR Bensely ALBERT D.MOHAN LAL School of Mechanical and Aerospace Engineering Nanyang Technological University 50 Nanyang AvenueSingapore 639798Singapore Department of Mechanical Engineering P.A.College of Engineering and TechnologyPollachi 642002TNIndia QuEST Global Services-NA Inc.GreenvilleSC 29615USA Department of Mechanical Engineering College of EngineeringGuindyAnna University Chennai 600025India

In this study,the effects of deep cryogenic treatment(DCT)on the mechanical and tribological properties of AISI D3 tool steel were investigated together with a systematic correlation between their hardness and wear *** was found that conventionally heat treated AISI D3 tool steel samples were significantly hardened via an additional DCT,which was attributed to the more retained austenite elimination,more homogenized carbide distribution and more reduction in carbide size in the *** a result,the hardened AISI D3 samples exhibited reductions in their friction and wear during rubbing against alumina and 100Cr6 steel balls under different normal loads due to the effectively hindered removal of surface *** results clearly showed that the DCT was an effective way to improve the mechanical and tribological properties of the AISI D3 tool steel samples as the tribological performance of the tool steel samples was significantly influenced by their hardness.

关键词： AISI D3 tool steel deep cryogenic treatment hardness friction wear

Coupled Mode Characteristics From the Perturbation of 3D Printed Long-Period Fiber Grating Devices

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Photonic Sensors 2020年第3期10卷 195-203页

作者： Ravivudh khun-IN Yuji USUDA Yuttapong JIRARAKSOPAKUN Apichai BHATRANAND Hideki YOKOI Graduate School of Engineering and Science Shibaura Institute of TechnologyTokyo 135-8548Japan Department of Electronics and Telecommunication Engineering King Mongkut’s University of Technology ThonburiBangkok 10140Thailand

Characteristics of electric field from a coupled mode inside an optical fiber under perturbation by three-dimensional(3D)printed long-period fiber grating(LPFG)device have been observed in this work by the experiment and *** various periodic index differences referring to the weights of perturbation by 3D printed LPFG device are applied on the single-mode *** experimental results show that the resonant wavelength shift is a linear function of the grating period with the maximum coefficient of determination R2 of *** of resonant wavelengths are chosen to run simulations to investigate the electric field *** scattering direction of the electric field states the magnitude of leaking optical power when the light transmits through the grating region applied to the single-mode *** the experimental and simulation results demonstrate that our proposed scheme can usefully be applied to selective tunable filters,intruder sensors,etc.

关键词： 3D printed long-period fiber grating device perturbation resonant wavelength electric field distribution

在开放中融入在严谨中守护——访访泰国PIA室内设计公司创始人khun PIA

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设计家 2015年第5期 38-45页

作者：王小静 khun PIA 《设计家》 P49 PIA室内设计公司

泰国地处东南亚的腹地,以美丽的自然环境和富有传统特色的建筑风情吸引着世界各地的游客.旅游业是泰国赖以生存发展的重要产业之一,卓越的酒店设计对旅游业的发展起到了良好的助推作用.泰国本土著名酒店设计师khunPIA,1978年创立了第一... 详细信息

泰国地处东南亚的腹地,以美丽的自然环境和富有传统特色的建筑风情吸引着世界各地的游客.旅游业是泰国赖以生存发展的重要产业之一,卓越的酒店设计对旅游业的发展起到了良好的助推作用.泰国本土著名酒店设计师khunPIA,1978年创立了第一家公司P49,1999年又独自创立了PIA室内设计公司,在酒店设计中表现不俗.

关键词：酒店设计建筑风情传统特色自然环境室内设计旅游业东南亚泰国