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Phase microscopy and surface profilometry by digital holography

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Light(Advanced Manufacturing) 2022年第3期3卷 1-12页

作者： Myung k.kim Department of Physics University of South FloridaTampaFL 33620

Quantitative phase microscopy by digital holography is a good candidate for high-speed,high precision ***-wavelength optical phase unwrapping avoids difficulties of numerical unwrapping methods,and can generate surface topographic images with large axial range and high axial *** the large axial range is accompanied by proportionately large *** iterative process utilizing holograms acquired with a series of wavelengths is shown to be effective in reducing the noise to a few micrometers even over the axial range of several *** alternate approach with shifting of illumination angle,instead of using multiple laser sources,provides multiple effective wavelengths from a single laser,greatly simplifying the system complexity and providing great flexibility in the wavelength *** are performed demonstrating the basic processes of multi-wavelength digital holography(MWDH)and multi-angle digital holography(MADH).Example images are presented for surface profiles of various types of surface *** methods have potential for versatile,high performance surface profilometry,with compact optical system and straightforward processing algorithms.

关键词： Phase Microscopy Profilometry Digital Holography

Comparable electrocatalytic performances of carbon-and Rh-loaded SrTiO_3 nanoparticles

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Chinese Chemical Letters 2018年第6期29卷 800-804页

作者： Hee Jung Yoon Seog k.kim Weixin Huang Youngku Sohn Department of Chemistry Yeungnam University Hefei National Laboratory for Physical Sciences at the Microscale CAS Key Laboratory of Materials for Energy Conversion Department of Chemical PhysicsUniversity of Science and Technology of China Department of Chemistry Chungnam National University

Carbon-and Rh-loaded strontium titanate（SrTiO3） nanoparticles（NPs） were synthesized respectively by the wet impregnation method and the aerobic and anaerobic ethanol oxidation methods, and characterized by scanning electron microscopy, high resolution transmission electron microscopy, X-ray diffraction crystallography, UV–vis absorption, Raman spectroscopy, and X-ray photoelectron spectroscopy. Carbon was shown to be uniformly coated on SrTiO3 NPs by the aerobic and anaerobic ethanol oxidation methods Electrocatalytic activities of unmodified and modified SrTiO3 NPs were tested for water splitting and CO2 reduction. The aerobic C-coated and Rh-loaded SrTiO3 catalysts showed comparable activity that was increased by 〉10-fold of that of unmodified SrTiO3 catalyst. These results demonstrate that both metallic and nonmetallic surface modifications can highly improve the electrocatalytic activity of SrTiO3 NPs and point to highlight a more important role of the modifier in the electrocatalytic reactions than of the SrTiO3 structure.

关键词： SrTiO3 Carbon Rhodium Ethanol oxidation Electrocatalytic water splitting Electrocatalytic CO2 reduction

Metabolic Plasticity of Nitrogen Assimilation by Porphyra umbilicalis(Linnaeus) kützing

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Journal of Ocean University of China 2012年第4期11卷 517-526页

作者： Jang k.kim George P.kraemer Charles Yarish Departments of Ecology and Evolutionary Biology and Marine Sciences University of Connecticut1 University PlaceStamfordCT 06901USA Department of Environmental Studies Purchase College735 Anderson Hill RoadPurchaseNY 10577USA

The physical stresses associated with emersion have long been considered major factors determining the vertical zona- tion of intertidal seaweeds. We examined Porphyra umbilicalis （Linnaeus） kiitzing thalli from the vertical extremes in elevation of an intertidal population （i.e. upper and lower intertidal zones） to determine whether Porphyra thalli acclimate to different vertical elevations on the shore with different patterns of nitrate uptake and nitrate reductase （NR） and glutamine synthetase （GS） activities in response to different degrees of emersion stress. We found that the nitrate uptake and NR recovery in the emersed tissues took longer in lower intertidal sub-population than in upper intertidal sub-population; and GS activity was also significantly affected by emersion and, interestingly, such an activity was enhanced by emersion of thalli from both upper and lower intertidal zones. These results sug- gested that intta-population variability in post-emersion recovery of physiological functions such as nutrient uptake and NR activity enables local adaptation and contributes to the wide vertical distribution ofP. umbilicalis. The high GS activity during periodic emer- sion stress may be a protective mechanism enabling P umbilicalis to assimilate nitrogen quickly when it again becomes available, and may also be an evidence ofphotorespiration during emersion.

关键词： emersion glutamine synthetase nitrate reductase nitrogen assimilation Porphyra

Effects of Mg Enhancement and Heat Treatment on Microstructures and Tensile Properties of Al2Ca-Added ADC12 Die Casting Alloys

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Journal of Materials Science & Technology 2016年第10期32卷 1043-1048页

作者： Gil-Yong Yeom Hyun kyu Lim Shae k.kim Soong-keun Hyun Young-Ok Yoon korea Institute of Industrial Technology lncheon 406-840 South Korea Department of Materials Science and Engineering Inha University lncheon 402-751 South Korea

The effects of Mg enhancement and heat treatment on the microstructures and tensile properties of Al_2Ca-added ADC12 die casting alloys were investigated. 0.3% and 0.5% Mg in the form of a master alloy including a trace amount of Al_2Ca were added to conventional ADC12（383 and AlSi10Cu2Fe） alloy with an initial Mg-content of 0.3% to increase the Mg content to 0.6% and 0.8%, respectively. To avoid heat treatmentinduced surface blisters, shortened solution treatment for 15 min at 490 ℃ and artificial aging for 6 h at 150 ℃ was undertaken. The results show that a 10% improvement in the shape factor of eutectic Si particles was achieved for Al_2Ca-added ADC12 with 0.8% Mg compared to the conventional ADC12 in the as-aged condition. Al_2Ca-added ADC12 with 0.8% Mg exhibited a yield strength of 289 MPa, a tensile strength of 407 MPa, and an elongation of 4.22%.

关键词： Al2Ca ADC12 alloy Heat treatment Die casting Inclusion

This work was supported in part by US Department of Energy Los Alamos National Laboratory contract 47145 and UT-Battelle LLC contract 4000159447 program manager Laura Biven.

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Visual Informatics 2020年第2期4卷 122-131页

作者： Yiran Li Takanori Fujiwara Yong k.Choi katherine k.kim kwan-Liu Ma Department of Computer Science University of CaliforniaDavisUnited States Betty Irene Moore School of Nursing University of CaliforniaDavisUnited States School of Medicine University of CaliforniaDavisUnited States

There is a growing trend of applying machine learning methods to medical datasets in order to predict patients’future *** some of these methods achieve high performance,challenges still exist in comparing and evaluating different models through their interpretable *** analytics can help clinicians improve evidence-based medical decision *** this work,we develop a visual analytics system that compares multiple models’prediction criteria and evaluates their *** our system,users can generate knowledge on different models’inner criteria and how confidently we can rely on each model’s prediction for a certain *** a case study of a publicly available clinical dataset,we demonstrate the effectiveness of our visual analytics system to assist clinicians and researchers in comparing and quantitatively evaluating different machine learning methods.

关键词： Clinical data XAI Tree-based machine learning models Model consistency Measures of dependence Visual analytics

High-precision method for measuring the photothermal properties of transparent media with digital holography

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Chinese Optics Letters 2011年第12期9卷 2-5页

作者： David C.Clark Myung k.kim Digital Holography and Microscopy Laboratory Department of PhysicsUniversity of South Florida

Quantitative phase microscopy by digital holography provides direct access to the phase profile of a transparent subject with high precision. This is useful for observing phenomena that modulate phase, but are otherwise difficult or impossible to detect. In this letter, a carefully constructed digital holographic apparatus is used to measure optically induced thermal lensing with an optical path difference precision of less than 1 nm. Furthermore, by taking advantage of the radial symmetry of a thermal lens, such data are processed to determine the absorption coefficient of transparent media with precisions as low as 1 × 10-5cm-1 using low power （30 mW） continuous wave （CW） excitation.

关键词： High-precision method for measuring the photothermal properties of transparent media with digital holography

Zeolitic imidazolate framework-67 derived Al-Co-S hierarchical sheets bridged by nitrogen-doped graphene:Incorporation of PANI derived carbon nanorods for solid-state asymmetric supercapacitors

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Journal of Energy Chemistry 2022年第11期31卷 429-445,I0012页

作者： Emad S.Goda Bidhan Pandit Sang Eun Hong Bal Sydulu Singu Seong k.kim Essam B.Moustafa kuk Ro Yoon kuk Ro Yoon Organic Nanomaterials Lab Department of ChemistryHannam UniversityDaejeon 34054Republic of Korea Gas Analysis and Fire Safety Laboratory Chemistry DivisionNational Institute for Standards136Giza 12211Egypt Department of Materials Science and Engineering and Chemical Engineering Universidad Carlos Ⅲ de MadridAvenida de La Universidad 3028911 LeganésMadridSpain Department of Chemical and Biomolecular Engineering Yonsei UniversitySeoul 03722Republic of Korea Department of Chemical Engineering Hannam University1646 Yuseongdae-roYuseong-guDaejeon 34054Republic of Korea Mechanical Engineering Department Faculty of EngineeringKing Abdulaziz UniversityP.O.Box 80204Jeddah 22254Saudi Arabia

Metal sulfides have been widely enticed as battery-type electrodes in supercapacitor devices because of their maximal theoretical ***,their lower conductivity and ion transport kinetics can largely restrict their rate performance,hence the practical usage in fields of demanding high power ***,the design of new electrodes with higher energy and power densities remains a highly challenging *** the best of our knowledge,a novel hierarchical composite of Al-CoS_(2) on nitrogendoped graphene(NG)is prepared based on a zeolite imidazole framework using a simple and scalable hydrothermal *** this hybrid,ultrathin Al-CoS_(2) nanosheet arrays are vertically orientated on the NG framework to limit self-aggregation,hence increasing the electrical property and cycle stability of *** is investigated that the Al/Co feeding ratio plays a crucial role in controlling the obtained hierarchical structure of Al-Co-S sheets and their electrode ***,Al^(3+) can influence remarkably the morphology and electrochemical property of the resultant graphene *** effective synergism is noticed between the redox Al-CoS_(2) and NG resulting in fast electron transfer and chargingdischarging ***,when the as-developed composite is utilized as a positive electrode at an applied current density of 1 A/g,a specific capacitance of 1915.8 F/g is attained with ultra-long cycle stability(96%,10,000 cycles)and an excellent retention rate(~89%).As a consequence,when a solid-state asymmetric supercapacitor(ASC)device is made by combining an Al-CoS_(2) @NG hybrid with a negative electrode made of polyaniline(PANI)derived carbon nanorods(PCNRs),it demonstrates remarkable specific capacitance(188 F/g),energy density(66.9 Wh/kg),and cyclic stability of 92%after 10,000 *** may open the pathway for the application of the next-generation supercapacitors in the future.

关键词： Hierarchical sheets MOFs Al-doped CoS_(2) Nitrogen-doped graphene Solid-state supercapacitor

Current Status of the kSTAR Engineering

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Plasma Science and Technology 2004年第1期6卷 2159-2165页

作者： J.S.Bak k.kim C.H.Choi Y.k.Oh B.C.kim N.I.Her H.L.Yang G.S.Lee the kSTAR Team korea Basic Science Institute 52 Yeoeun-Dong Yusung-Ku Daejeon 305-333 KoreaKorea Basic Science Institute 52 Yeoeun-Dong Yusung-Ku Daejeon 305-333 KoreaKorea Basic Science Institute 52 Yeoeun-Dong Yusung-Ku Daejeon 305-333 KoreaKorea Basic Science Institute 52 Yeoeun-Dong Yusung-Ku Daejeon 305-333 KoreaKorea Basic Science Institute 52 Yeoeun-Dong Yusung-Ku Daejeon 305-333 KoreaKorea Basic Science Institute 52 Yeoeun-Dong Yusung-Ku Daejeon 305-333 KoreaKorea Basic Science Institute 52 Yeoeun-Dong Yusung-Ku Daejeon 305-333 KoreaKorea Basic Science Institute 52 Yeoeun-Dong Yusung-Ku Daejeon 305-333 KoreaKorea Basic Science Institute 52 Yeoeun-Dong Yusung-Ku Daejeon 305-333 Korea

As there is substantial progress in the kSTAR tokamak engineering, all themajor structures and sub-systems are under fabrication and in procurement phase. The vacuum vessel,port, cryostat cylinder, lid, and bellows are being rigorously fabricated in the factory. The lowerpart of the kSTAR such as cryostat base and gravity support has been almost finished in itsfabrication. There are also great progresses and significant results in manufacturing of thesuperconducting magnet, including four Toroidal Field (TF) coils, lower and upper PF7 coils whichare the largest Poloidal Field (PF) coils. The TFOO coil, which has been made for test and back-upof the TF magnet system, was successfully tested in the cool-down and current charging. As thefabrications and procurements of major structures have been actively proceeded, assembly works werealso launched from Aug. 2003. More detailed description on these status, results, and plans will bedescribed in this paper.

关键词： kSTAR tokamak vacuum vessel magnet cryostat tokamak assembly

FIRE SUPPRESSION PERFORMANCE OF WATER MIST SYSTEMS WITH ADDITIVES

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FIRE SUPPRESSION PERFORMANCE OF WATER MIST SYSTEMS WITH ADDI...