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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

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

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

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

Thermal,mechanical and tribological properties of polymer matrix composites incorporated with microcapsules

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Thermal,mechanical and tribological properties of polymer ma...

Complete mitochondrial genome of the leaf muntjac(Muntiacus putaoensis) and phylogenetics of the genus Muntiacus

China 6th International Symposium on Tribology

作者： nay win khun School of Mechanical and Aerospace Engineering Nanyang Technological University 50 Nanyang AvenueSingapore 639798Singapore

＜正＞A tremendous interest is increasingly raised in scientific and industrial communities to apply polymer matrix microcomposites（PMCs） as structural materials in aerospace,automotive and chemical industries since the thermal,electrical and mechanical properties of the PMCs can be tailored by controlling microparticles *** this study,microcapsules containing a wax lubricant synthesized via in-situ polymerization in emulsion were incorporated in epoxy and silicone matrices to form new microcomposite materials for *** influences of microcapsule concentration on the microstructure,and thermal, mechanical and tribological performances of the microcapsule-epoxy composites were systematically investigated using scanning electron microscopy（SEM）, thermal gravimetric analysis（TGA）,differential scanning calorimetry（DSC）,micro-indentation test, surface profilometry,sessile liquid drop test and ball-on-disc micro-tribological *** increase in microcapsule content in the composites degraded the thermal stability and accelerated the kinetics of glass transition of the composites,while the increased soft phases of the microcapsules in the polymer matrices were responsible for the reduced micro-hardness and Young’s modulus of the *** hydrophobicity of the composite surfaces was enhanced by higher concentrations of *** tribological results indicated that higher microcapsule contents significantly reduced the friction of the composites since the lubricant released from the broken microcapsules caused by the wear of the composite surfaces during the sliding wear test lubricated the rubbing surfaces.

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Zoological Research 2017年第5期38卷 310-316页

作者： Guo-Gang Li Ming-Xia zhang Kyaw Swa Kyaw-win Maung Rui-Chang Quan Southeast Asia Biodiversity Research Institute Chinese Academy of Sciences Yezin Nay Pyi Taw 05282 Myanmar Center for Integrative Conservation Xishuangbanna Tropical Botanical Garden Chinese Academy of Sciences Mengla Yunnan 666303China Hponkan Razi Wildlife Sanctuary Offices Putao Kachin 01051 Myanmar Forest Research Institute Forest Department Ministry of Environmental Conservation and Forestry Yezin Nay Pyi Taw 05282 Myanmar

The leaf muntjac （Muntiacus putaoensis） is an endemic deer species found in the east trans- Himalayan region. In recent years, population numbers have decreased due to heavy hunting and habitat loss, and little genetic data exists for this species, thus our knowledge of distribution rangs and population sizes likewise remain limited. We obtained mtDNA genes and the complete mitochondrial genome sequence of M. putaoensis using PCR, followed by direct sequencing. The complete mitogenome sequence was determined as a circular 16 349 bp mitochondrial genome, containing 13 protein-coding genes, two rRNA genes 22 tRNA genes, and one control region, the gene composition and order of which were similar to most other vertebrates so far reported. Most mitochondrial genes, except for ND6 and eight tRNAs, were encoded on the heavy strand. The overall base composition of the heavy strand was 33.1% A, 29.3% T, 24.2% C, and 13.4% G, with a strong AT bias of 62.4%. There were seven regions of gene overlap totaling 95 bp and 11 intergenic spacer regions totaling 74 bp. Phylogenetic analyses （ML and BI） among the Muntiacus genus based on the sequenced of mitogenome and ND4L-ND4 supported M. putaoensis as a member of Muntiacus, most closely related to M. vuquangensis. However, when analyses based on cyt b included two more muntjacs, M. truongsonensis was most closely related to M. putaoensis rather than M. vuquangensis, and together with M. rooseveltorum, likely forming a M. rooseveltorum complex of the species. This study will help in the exploration of the evolutionary history and taxonomic status of the leaf muntjac, as well as its protection as a genetic resource.

关键词： Muntiacus Muntiacus putaoensis Mitogenome Phylogenetics

Molecular phylogeny of the genus Muntiacus with special emphasis on the phylogenetic position of Muntiacus gongshanensis

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Zoological Research 2021年第2期42卷 212-216页

作者： Yun-Chun zhang Ye Htet Lwin Ren Li Kyaw-win Maung Guo-Gang Li Rui-Chang Quan Southeast Asia Biodiversity Research Institute Chinese Academy of Sciences&Center for Integrative ConservationXishuangbanna Tropical Botanical GardenChinese Academy of SciencesMenglaYunnan 666303China University of Chinese Academy of Sciences Beijing 100049China Forest Research Institute Forest Department Ministry of Environmental Conservation and ForestryYezinNay Pyi Taw 05282Myanmar College of Life Sciences Qinghai Normal UniversityXiningQinghai 810008China Center of Conservation Biology Core Botanical GardensChinese Academy of ScienceMenglaYunnan 666303China

DEAR EDITOR,Muntjac deer(Cervidae: Muntiacus) are often cited as an excellent model for the study of vertebrate evolution due to their fast rate of change in chromosome number among vertebrates. However, the phylogenetic relationships within Muntiacus generally, and the taxonomic status of Muntiacus gongshanensis specifically, remain unclear.

关键词： phylogeny Molecular ens

Contributions to the flora of Myanmar from 2000 to 2019

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Plant Diversity 2020年第4期42卷 292-301页

作者： Bin Yang Min Deng Ming-Xia zhang Aung Zaw Moe Hong-Bo Ding Mya Bhone Maw Pyae Pyae win Richard TCorlett Yun-Hong Tan Southeast Asia Biodiversity Research Institute Chinese Academy of SciencesYezinNay Pyi Taw05282Myanmar Center for Integrative Conservation Xishuangbanna Tropical Botanical GardenChinese Academy of SciencesMenglunMenglaYunnan666303PR China Center of Conservation Biology Core Botanical GardensChinese Academy of SciencesMenglunMenglaYunnan666303PR China School of Ecology and Environmental Science Yunnan UniversityKunmingYunnan650091PR China Forest Research Institute Forest DepartmentMinistry of Environmental Conservation and ForestryYezinNay Pyi Taw05282Myanmar

Myanmar is botanically rich and floristically diverse:one of the world's biodiversity ***,Myanmar is still very unevenly explored,and until a plant checklist was published in 2003,relatively little work was done on its *** checklist included 11,800 species of spermatophytes in 273 *** this checklist was published,the botanical exploration of Myanmar has accelerated and there have been many additional *** therefore surveyed the literature of taxonomic contributions to Myanmar’s vascular flora over the last 20 years(2000e2019)and compiled a list of new and newly described *** list includes 13 genera,193 species,7 subspecies,19 varieties,and 2 forms new to science;and 3 families,34 genera,347 species,4 subspecies,7 varieties,and 1 form newly recorded in ***,they represent 91 families and 320 *** of the new discoveries belong to 15 families,with more than 25%(146 taxa)belonging to *** new discoveries are unevenly distributed in the country,with about 41%of the newly discovered species described from Kachin State in northeast *** reflects the incompleteness of our current knowledge of the flora of Myanmar and the urgent need for a greatly expanded *** completion of the flora of Myanmar requires more fieldwork from north to south,taxonomic studies on new and existing collections,and some mechanism that both coordinates the efforts of various international institutions and initiatives and encourages continued international *** addition,producing modern taxonomic treatments of the flora of Myanmar requires the participation of experts on all vascular plant families and *** is also an urgent need to attract young scientists to plant taxonomy,to work on inventories,identification,nomenclature,herbarium work,and comparative studies.

关键词： Flora New species Taxonomy Plant diversity Specimens

Five newly recorded Cyprinid fish (Teleostei： Cypriniformes) in Myanmar

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Zoological Research 2017年第5期38卷 300-309页

作者： Tao Qin Zhi-Ying Chen Lu-Lu Xu Paing Zaw Yunn Mi Mi Kyaw Kyaw win Maung Xiao-Yong Chen Southeast Asia Biodiversity Research Institute Chinese Academy of Sciences Yezin Nay Pyi Taw 05282 Myanmar Kunming Institute of Zoology Chinese Academy of Sciences Kunming Yunnan 650223 China Kunming Collage of Life Science University of Chinese Academy of Sciences Kunming Yunnan 650204 China Forest Research Institute Yezin Nay Pyi Taw 05282 Myanmar

Freshwater fish from the Putao and Myitkyina areas were collected in three ichthyofaunal surveys of the Mall Hka River and tributaries in and around Khakaborazi National Park and Hponkanrazi Wildlife Sanctuary, Kachin State, from 2014-2016. Tor yingjiangensis Chen et Yang 2004, Tor qiaojiensis Wu et al. 1977, Garra qiaojiensis Wu et al. 1977, Garra bispinosa zhang 2005, and Schizothorax oligolepis Huang 1985, originally described from the upper Irrawaddy （Ayeyarwaddy） River in China, are first reported herein as new records to Myanmar. Counts, measurements, descriptions, photographs, and distributions of the specimens of the five newly recorded species are provided.

关键词： New record Cyprinidae Mali Hka River Irrawaddy Myanmar