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Ultra-thin light-weight laser-induced-graphene (LIG) diffractive optics

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Light(Science & Applications) 2023年第7期12卷 1268-1300页

作者： Younggeun Lee Mun Ji Low Dongwook Yang Han Ku Nam Truong-Son Dinh Le Seung Eon Lee Hyogeun Han Seunghwan Kim Quang huy vu Hongki Yoo Hyosang Yoon Joohyung Lee Suchand Sandeep Keunwoo Lee Seung-Woo Kim Young-Jin Kim Department of Mechanical Engineering Korea Advanced Institute of Science and Technology(KAIST)Daehak-roYuseong-guDaejeon 34141Republic of Korea School of Mechanical and Aerospace Engineering Nanyang Technological University(NTU)50 Nanyang Avenue639798 SingaporeSingapore Panasonic Factory Solutions Asia Pacific(PFSAP) 285 Jalan Ahmad Ibrahim639931 SingaporeSingapore Department of Aerospace Engineering Korea Advanced Institute of Science and Technology(KAlST)Daehak-roYuseong-guDaejeon 34141Republic of Korea Department of Mechanical System Design Engineering Seoul National University of Science and Technology(Seuoltech)232 Gongneung-roNowon-guSeoul 01811Republic of Korea LASER N GRAPN INC 193 Munj-roYuseong-guDaejeon 34051Republicof Korea

The realization of hybrid optics could be one of the best ways to fulfll the technological requirements of compact,light-weight,and multi-functional optical systems for modern *** diffractive lens(PDL)such as diffractive lenses,photonsieves,and metasurfaces can be patterned on ultra-thin flexible and stretchable substrates and be conformally attached on top of arbitrarily shaped *** this review,we introduce recent research works addressed to the design and manufacturing of ultra-thin graphene optics,which will open new markets in compact and light-weight optics for next-generation endoscopic brain imaging,space internet,real-time surface proflometry,and multi-functional mobile *** provide higher design flexibility,lower process complexity,and chemical-free process with reasonable investment cost,direct laser writing(DLW)of laser-induced-graphene(LIG)is actively being applied to the patterning of *** realizing the best optical performances in DLW,photon-material interactions have been studied in detail with respect to different laser parameters;the resulting optical characteristics have been evaluated in terms of amplitude and phase.A series of exemplary laser-written 1D and 2D PDL structures have been actively demonstrated with different base materials,and then,the cases are being expanded to plasmonic and holographic *** combination of these ultra-thin and light-weight PDL with conventional bulk refractive or reflective optical elements could bring together the advantages of each optical *** integrating these suggestions,we suggest a way to realize the hybrid PDL to be used in the future micro-electronics surface inspection,biomedical,outer space,and extended reality(XR)industries.

关键词： optics weight holographic

An exploration of meteorological effects on PM_(2.5) air quality in several provinces and cities in Vietnam

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Journal of Environmental Sciences 2024年第11期145卷 139-151页

作者： Giang Tran Huong Nguyen Luan Thien La huy Hoang-Cong Anh Hoang Le Faculty of Chemistry and Environment Dalat UniversityLam Dong ProvinceVietnam Environmental Protection Agency Lam Dong Province Department of Natural Resources and EnvironmentLam Dong ProvinceVietnam Northern Center for Environmental Monitoring Environmental Pollution Control DepartmentHa Noi CityVietnam Faculty of Environment University of ScienceHo Chi Minh CityVietnam Vietnam National University Ho Chi Minh CityVietnam

Linking meteorology and air pollutants is a key *** study investigated meteorological effects on PM_(2.5)concentration using the advanced convergent cross mapping method,utilizing hourly PM_(2.5)concentration and six meteorological factors across eight provinces and cities in *** demonstrated that temperature(ρ=0.30)and radiation(ρ=0.30)produced the highest effects,followed by humidity(ρ=0.28)and wind speed(ρ=0.24),while pressure(ρ=0.22)and wind direction(ρ=0.17)produced the weakest effects on PM_(2.5)*** theρvalues showed that temperature,wind speed,and wind direction had greater impacts on PM_(2.5)concentration during the dry season whereas radiation had a more influence during the wet season;Southern stations experienced larger meteorological ***,humidity,pressure,and wind direction had both positive and negative influences on PM_(2.5)concentration,while radiation and wind speed mostly had negative *** PM_(2.5)pollution episodes,there wasmore contribution ofmeteorological effects on PM_(2.5)concentration indicated byρ*** contaminated levels,humidity(ρ=0.45)was the most dominant factor affecting PM_(2.5)concentration,followed by temperature(ρ=0.41)and radiation(ρ=0.40).Pollution episodes were pointed out to be more prevalent under higher humidity,higher pressure,lower temperature,lower radiation,and lower wind ***ρcalculation also revealed that lower temperature,lower radiation,and higher humidity greatly accelerated each other under pollution episodes,further enhancing PM_(2.5)*** findings contributed to the literature on meteorology and air pollution interaction.

关键词： Fine particulate matter Air pollution Meteorological effect Convergent cross mapping Causality analysis Vietnam

Current scenario and challenges of plastic pollution in Bangladesh:a focus on farmlands and terrestrial ecosystems

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Frontiers of Environmental Science & Engineering 2023年第6期17卷 1-22页

作者： MdRaihanul Islam Sumaiya Akter Ruponti MdAbdur Rakib huy Quoc Nguyen Monjur Mourshed Faculty of Agriculture Bangabandhu Sheikh Mujibur Rahman Agricultural UniversityGazipur 1706Bangladesh Department of Microbiology Faculty of Biological Science and TechnologyJashore University of Science of TechnologyJashore 7408Bangladesh Faculty of Heat and Refrigeration Engineering The University of Danang—University of Science and TechnologyDanang 550000Vietnam Mechanical and Automotive Engineering School of EngineeringRMIT UniversityBundooraVictoria 3083Australia Department of Mechanical Engineering Rajshahi University of Engineering and Technology(RUET)Rajshahi 6204Bangladesh

Plastic is considered one of the most indispensable commodities in our daily *** the end of life,the huge ever-growing pile of plastic waste(PW)causes serious concerns for our environment,including agricultural farmlands,groundwater quality,marine and land ecosystems,food toxicity and human health *** of proper infrastructure,financial backup,and technological advancement turn this hazardous waste plastic management into a serious threat to developing countries,especially for Bangladesh.A comprehensive review of PW generation and its consequences on environment in both global and Bangladesh contexts is *** dispersion routes of PW from different sources in different forms(microplastic,macroplastic,nanoplastic)and its adverse effect on agriculture,marine life and terrestrial ecosystems are illustrated in this *** key challenges to mitigate PW pollution and tackle down the climate change issue is discussed in this ***,way forward toward the design and implementation of proper PW management strategies are highlighted in this study.

关键词： Plastic waste Farmlands Terrestrial ecosystem Marine life

Novel Criteria for Exponential Stability of Linear Non-Autonomous Functional Differential Equations

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Journal of Systems Science & Complexity 2019年第2期32卷 479-495页

作者： PHAM HUU ANH Ngoc THAI BAO Tran CAO THANH Tinh NGUYEN DINH huy Department of Mathematics Vietnam National University-HCMC International University Faculty of Information Systems Vietnam National University-HCMC University of Information Technology Department of Mathematics Vietnam National University-HCMC University of Information Technology Division of Applied Mathematics Faculty of Applied Sciences Vietnam National University-HCMC Ho Chi Minh city University of Technology

General linear non-autonomous functional differential equations are considered. Explicit criteria for exponential stability are given. Furthermore, the authors present an explicit robust stability bound for systems su... 详细信息

关键词： Exponential stability linear functional differential equations perturbation

Fabrication of a TiO2-P25/（TiO2-P25+TiO2 nanotubes） junction for dye sensitized solar cells

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Progress in Natural Science:Materials International 2016年第4期26卷 375-379页

作者： Nguyen huy Hao Gobinda Gyawali Tohru Sekino Soo Wohn Lee Research Center for Eco-multifunctional Nano Materials Sun Moon University The Institute of Scientific and Industrial Research (ISIR-SANKEN) Osaka University Department of Environmental and Bio-chemical Engineering Sun Moon University

The dye sensitized solar cell（DSSC）, which converts solar light into electric energy, is expected to be a promising renewable energy source for today's world. In this work, dye sensitized solar cells, one containing a single layer and one containing a double layer, were fabricated. In the double layer DSSC structure, the under-layer was TiO2-P25 film, and the top layer consisted of a mixture of TiO2-P25 and TiO2nanotubes. The results indicated that the efficiency of the DSSC with the double layer structure was a significant improvement in comparison to the DSSC consisting of only a single film layer. The addition of TiO2-P25 in the top layer caused an improvement in the adsorption of dye molecules on the film rather than on the TiO2nanotubes only. The presence of the TiO2nanotubes together with TiO2-P25 in the top layer revealed the enhancement in harvesting the incident light and an improvement of electron transport through the film.

关键词： TiO2 nanotube Hydrothermal method DSSC Efficiency Double layer

新兴葡萄酒旅游目的地空间网络结构及其影响因素--基于社会网络分析方法(QAP)

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地理科学 2022年第9期42卷 1619-1626页

作者：顾秋实叶浩彬 vu huy Quan 黄松山宋海岩龚丽丹张雷东南大学人文学院江苏南京211189 华南师范大学旅游管理学院广东广州510631 澳大利亚迪肯大学信息系统和商业数据分析系墨尔本伯伍德3125 澳大利亚埃迪斯科文大学商法学院珀斯君达乐6027 香港理工大学旅游及酒店业管理学院中国香港九龙999077 中国葡萄酒产业技术研究院宁夏银川750021

以宁夏贺兰山东麓这一新兴葡萄酒旅游目的地为例,构建酒庄和景点之间的空间联系网络,并对影响目的地空间网络结构的因素进行分析。结果表明:热门景点处于贺兰山东麓葡萄酒旅游网络中心,而非酒庄。区域、节点等级、获得等级的时间与可访... 详细信息

以宁夏贺兰山东麓这一新兴葡萄酒旅游目的地为例,构建酒庄和景点之间的空间联系网络,并对影响目的地空间网络结构的因素进行分析。结果表明:热门景点处于贺兰山东麓葡萄酒旅游网络中心,而非酒庄。区域、节点等级、获得等级的时间与可访问性等因素显著影响了新兴葡萄酒目的地的网络结构;在新兴葡萄酒旅游目的地,位于相同区域的酒庄由于地理位置邻近,可以共享客源;酒庄获得类似等级以及获级时间邻近也可共享网络吸引葡萄酒游客。然而,成立时间和景点类型并不是葡萄酒旅游地空间网络的重要影响指标。基于此,提出当地政府应制定促进和发展葡萄酒旅游的战略计划,推动葡萄酒品牌形象提升;酒庄应提升自身星级,加强旅游设施建设、提升接待能力,从而承接更多客流量,获得竞争优势。

关键词：网络分析葡萄酒旅游目的地社会网络分析方法(QAP) 宁夏旅游者移动

The Packaging Materials with Carbon Nanotube/Polymer Composites

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稀有金属材料与工程 2006年第S3期 1-2页

作者： Wern-Shirang Jou huy-Zu Cheng Department of Mold and Die Engineering National Kaohsiung University of Applied SciencesTaiwanChina Department of Materials Science and Engineering I-Shou UniversityTaiwanChina

关键词： packaging materials carbon nano-tube polymer composites

An analytical model for cross-Kerr nonlinearity in a four-level N-type atomic system with Doppler broadening

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Chinese Physics B 2022年第2期31卷 314-319页

作者： Dinh Xuan Khoa Nguyen huy Bang Nguyen Le Thuy An Nguyen Van Phu Le Van Doai Vinh University 182 Le Duan StreetVinh CityVietna

We present an analytical model for cross-Kerr nonlinear coefficient in a four-level N-type atomic medium under Doppler *** model is applied to87 Rb atoms to analyze the dependence of the cross-Kerr nonlinear coefficient on the external light field and the temperature of atomic *** analysis shows that in the absence of electromagnetically induced transparency(EIT)the cross-Kerr nonlinear coefficient is zero,but it is significantly enhanced when the EIT is *** means that the cross-Kerr effect can be turned on/off when the external light field is on or ***,the amplitude and the sign of the cross-Kerr nonlinear coefficient are easily changed according to the intensity and frequency of the external light *** amplitude of the cross-Kerr nonlinear coefficient remarkably decreases when the temperature of atomic medium *** analytical model can be convenient to fit experimental observations and applied to photonic devices.

关键词： electromagnetically induced transparency Kerr nonlinear effect Doppler effect

可注射磷酸钙骨水泥/聚乳酸羟基乙酸共聚物微球（CPC/PLGA）植入物的生物力学测试

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可注射磷酸钙骨水泥/聚乳酸羟基乙酸共聚物微球（CPC/PLGA）植入...

作者：武辉煌（vu huy Hoang）广西医科大学

学位级别：硕士

目的考察血液对磷酸钙骨水泥（Calcium phosphate cement,CPC）凝固性能的影响,了解磷酸钙骨水泥/聚乳酸羟基乙酸微球复合物（Calcium phosphate cement/Poly lactide-co-glycolide acid,CPC/PLGA）植入体内转生骨的力学性能,为材... 详细信息

目的考察血液对磷酸钙骨水泥（Calcium phosphate cement,CPC）凝固性能的影响,了解磷酸钙骨水泥/聚乳酸羟基乙酸微球复合物（Calcium phosphate cement/Poly lactide-co-glycolide acid,CPC/PLGA）植入体内转生骨的力学性能,为材料能在临床应用提供参考数据。方法 1.体外实验：按以下合成方法分别制备CPC凝固时间及压缩强度样本。 ①空白对照组（C组）,CPC按照0.3m1/g的粉液比混合;②实验组（B组）：抽取兔子新鲜血液,在CPC粉液调和后将不同含量的血液加入CPC糊剂中进行二次混合,根据血液占CPC质量比例不同,分为5%（B1组）、10%（B2组）、15%（B3组）;③阴性对照组（BG组）：抽取兔新鲜血,先加入10%肝素钠进行阻凝,其余处理方法同B组。测试各组样本的CPC凝固时间以及压缩强度,分析比较不同含量的血液对CPC的凝固及力学性能影响。 2.体内实验：建立犬下颌前磨牙牙齿缺失模型,每只动物下颌骨制备3个缺损区,在缺失区分别植入不同材料：①CPC/PLGA微球复合物（CP组）,②Bio-oss骨粉（阳性对照组Bio组）,③空白对照组（C组,不加入任何材料）。在4周、8周、12周的时候处死动物取样,制备样本分别进行放射学检查及压缩强度测试,每组3只实验犬。结果 1.体外实验：①凝固时间：空白对照组CPC（C组）的凝固时间（15.6±0.55min）比加入血液（B组）及加入血液+肝素钠（BG组）快;加入血液的B组内,凝固时间比C组延长,但随着血液含量的增加而加快,凝固时间最快为B3组（24.60+0.55min）;加入肝素钠+血液的BG组内,。凝固时间比C组明显延长,但随着血液含量的增加也有所加快,最快为BG3组（40.2±0.45min）。②压缩强度：B组内,压缩强度最高的是B2组（25.80±8.57MPa）,压缩强度随着血液含量的增加而下降,分别为B1组（25.44+1.10MPa）,B2组（25.80±8.57MPa）,B3组（24.95±3.36MPa）;BG组内,压缩强度明显低于C组,随着血液含量的增加而明显下降,分别为BG1组（21.66±1.72MPa）,BG2组（18.24±1.91MPa）BG3组（13.44±2.33MPa）;C组的压缩强度为22.64±4.06MPa。 2.体内实验：①动物大体观察：术后实验动物存活,食欲及行动未见异常,伤口愈合良好,未发现术后动物有中毒现象,但CP组和Bio组在8周取样时样本破损,样本量变为2个。②力学性能测试结果：4周时,CP组的弹性模量（94.24±29.88Mpa）高于Bio组（53.84+23.15Mpa）,但低于C组（152.05+46.25Mpa）;8周时,CP组的弹性模量（142.59+147.90Mpa）低于Bio组（164.94±39.88Mpa）,相对接近于C组（147.01±117.53Mpa）;12周时,CP组的弹性模量（123.6653.66Mpa）明显低于Bio组（348.67±45.33Mpa）及C组（233.12±178.69Mpa）。结论在有血液的情况下CPC的凝固时间变长,但如果血液含量不超过CPC重量的15%不影响其临床应用。本实验研究条件下,CPC/PLGA微球复合物植入动物体内12周后获得的骨组织韧性高于天然骨,Bio-oss骨粉植入体内12周后,降解较少,获得的骨组织脆性比天然骨大。

关键词：磷酸钙骨水泥/聚乳酸羟基乙酸共聚物生物力学性能凝固时间