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Small droplet,big world

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Droplet 2022年第1期1卷 1-1页

作者： Luquan Ren chang‐jin kim Zuankai Wang Key Laboratory of Bionic Engineering(Ministry of Education) Jilin UniversityChangchunChina Department of Mechanical and Aerospace Engineering University of CaliforniaLos AngelesCaliforniaUSA Department of Mechanical Engineering City University of Hong KongHong KongChina

It is hard to imagine something as scientifically and visually beautiful as droplets and *** nature,plants and animals use droplets and bubbles to survive,evolve,and *** in the Namib Desert drink from droplets on their backs collected from the fogladen wind,pistol shrimps utilize collapsing bubbles to stun prey,and pathogenic microbes spread through tiny droplets seeking new hosts.

关键词： utilize seeking evolve

Optical Probe for Determination of Chromium（Ⅲ） Ion in Aqueous Solution Based on Sol-Gel-Entrapped Lucigenin Chemiluminescence

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Optical Probe for Determination of Chromium（Ⅲ） Ion in Aqu...

Determination of Rutin Using Lucigenin as Chemiluminogenic Reagent

The 3rd Asian and Oceanian Conference on Photobiology

作者： Seung Oh jin Seikh Mafiz Alam Hye Young Chung Jong Ha Choi Sang Hak Lee chang jin kim Department of Chemistry Kyungpook National UniversityTaegu702-701Korea Department of Chemistry Kyungpook National UniversityTaegu702-701Korea Department of Chemistry Kyungpook National UniversityTaegu702-701Korea Department of Chemistry Andong National UniversityAndong760-749Korea Department of Chemistry Kyungpook National UniversityTaegu702-701Korea Department of Chemistry Daegu UniversityTaegu705-033Korea

＜正＞A method to determine chromium（Ⅲ） ion in aqueous solution by chemiluminescence method using a lucigenin entrapped silica sol-gel film has been studied. An optical probe for chromium（Ⅲ） ion has been prepared by entrapping lucigenin into silica sol-gel film coated on a glass support by dip coating. The chromium（Ⅲ） optical sensor is based on the catalytic effect of chromium（Ⅲ） ion on the reaction between lucigenin and hydrogen peroxide in basic solutions. The effects of Nafion, DMF and Triton X-100 were investigated to find the optimum condition to minimize cracking and leaching from the probe. The effects of pH and concentrations of lucigenin and hydrogen peroxide on the chemiluminescence intensity were investigated. The chemiluminescence intensity was increased linearly with increasing chromium（Ⅲ） concentration from 2.5×10-4 M to 8.0×10-7 M and the detection limit was 4.0×10-7M.

关键词： Sensor Sol-gel Chromium(Ⅲ) Chemiluminescence.

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Determination of Rutin Using Lucigenin as Chemiluminogenic R...

The 3rd Asian and Oceanian Conference on Photobiology

作者： Seung Oh jin Kyoung Hye Choi Yeoun Suk Suh Sang Hak Lee Jong Ha Choi chang jin kim Department of Chemistry Kyungpook National UniversityTaegu702-701Korea Department of Chemistry Kyungpook National UniversityTaegu702-701Korea Department of Chemistry Kyungpook National UniversityTaegu702-701Korea Department of Chemistry Kyungpook National UniversityTaegu702-701Korea Department of Chemistry Andong National UniversityAndong760-749Korea Department of Chemistry Daegu University Taegu 705-033 Korea

＜正＞Rutin, a flavanoid glucoside known as vitamin P, is an oral capillary preservatory drug, usually used for the therapy of chronic venous insufficiency. An inhibitory effect of rutin on the chemiluminescence （CL） reaction between lucigenin and hydrogen peroxide was reported, and this effect was used for the determination of rutin in medicine. The CL signal produced by the reaction between lucigenin and H2O2, was decreased in the presence of rutin. Rutin was sensed by measuring the decrement of CL intensity, and which was observed to be linear over 1×10-6M - 1×10-4M rutin concentration range, and the limit of detection was 2.5×10-7M. The concentrations of lucigenin, H2O2, NaOH and flow rate of the manifold were all optimized. The method proposed was applied successfully in the determination of rutin in pharmaceutical preparations .

关键词： Rutin Lucigenin Chemiluminescence

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微细凹版胶印印版间液体转移过程研究

中国印刷与包装研究 2009年第6期1卷 64-69页

作者： Hyun Wook Kang Hyung jin Sung Taik-Min Lee Dong-Soo kim chang-jin kim 曹华(编译) Department of Mechanical Engineering KAIST 373-1 Guseong-dong Yuseong-gu Daejeon 305-701Korea Nano Convergence Machinery Research Division 171 Jang-dong Yuseong-gu Daejeon 305-343Korea Mechanical and Aerospace Engineering Department University of California at Los Angeles Los Angeles CA 90095-1597 USA 不详

为提高微细凹版胶印中油墨转移率,对两分离平行版之间的液体转移过程进行了实验研究。一版固定,另一版垂直移动,附着于版上的液滴被一分为二。因为两液滴的容积比随接触角而变化,所以在本研究中需特别关注两版上液滴的表面接触角。改变... 详细信息

为提高微细凹版胶印中油墨转移率,对两分离平行版之间的液体转移过程进行了实验研究。一版固定,另一版垂直移动,附着于版上的液滴被一分为二。因为两液滴的容积比随接触角而变化,所以在本研究中需特别关注两版上液滴的表面接触角。改变表面接触角的方法有化学处理、等离子体表面改性和介质电润湿等,通过图像分析可观测表面接触角和测量液滴体积。同时研究了液体转移过程及其相关现象,如液滴与平行版接触区域内卫星式液滴的产生及变化。实验结果有助于确定微细凹版胶印中印版滚筒、橡皮滚筒及基材的最佳表面能。

关键词：液体胶印印版一分为二化学处理等离子体图像分析两分离

Aligned Ion Conduction Pathway of Polyrotaxane‑Based Electrolyte with Dispersed Hydrophobic Chains for Solid‑State Lithium–Oxygen Batteries

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Nano-Micro Letters 2025年第2期17卷 169-186页

作者： Bitgaram kim Myeong‑chang Sung Gwang‑Hee Lee Byoungjoon Hwang Sojung Seo Ji‑Hun Seo Dong‑Wan kim Department of Materials Science and Engineering Korea University145 Anam‑RoSeongbuk‑GuSeoul 02841Republic of Korea School of Civil Environmental and Architectural EngineeringKorea University145 Anam‑RoSeongbuk‑GuSeoul 02841Republic of Korea Materials Science and Chemical Engineering Center Institute for Advanced Engineering(IAE)Yongin 17180Republic of Korea

A critical challenge hindering the practical application of lithium–oxygen batteries(LOBs)is the inevitable problems associated with liquid electrolytes,such as evaporation and safety *** study addresses these problems by proposing a modified polyrotaxane(mPR)-based solid polymer electrolyte(SPE)design that simultaneously mitigates solvent-related problems and improves ***-SPE exhibits high ion conductivity(2.8×10^(−3)S cm^(−1)at 25℃)through aligned ion conduction pathways and provides electrode protection ability through hydrophobic chain *** this mPR-SPE into solid-state LOBs resulted in stable potentials over 300 *** situ Raman spectroscopy reveals the presence of an LiO_(2)intermediate alongside Li_(2)O_(2)during oxygen *** situ X-ray diffraction confirm the ability of the SPE to hinder the permeation of oxygen and moisture,as demonstrated by the air permeability *** present study suggests that maintaining a low residual solvent while achieving high ionic conductivity is crucial for restricting the sub-reactions of solid-state LOBs.

关键词： Solid polymer electrolyte Lithium-oxygen batteries Polyrotaxane ion conductivity Hydrophobic chain

Biogeochemical cyclic activity of bacterial arsB in arsenic-contaminated mines

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Journal of Environmental Sciences 2008年第11期20卷 1348-1355页

作者： chang jin-Soo kim Kyoung-Woong Department of Environment Science and Engineering Gwangju Institute of Science and Technology (GIST)261 Cheomdan-gwagiroBuk-guGwangjuRepublic of Korea.

Biogeochemical cyclic activity of the ars (arsenic resistance system) operon is arsB influx/effux encoded by the ecological of Pseudomonas *** suggests that studying arsenite-oxidizing bacteria may lead to a better understanding of molecular geomicrobiology,which can be applied to the bioremediation of arsenic-contaminated *** is the first report in which multiple arsB-binding mechanisms have been used on indigenous *** ArsB (strains OS-5; ABB83931; OS-19; ABB04282 and RW-28; ABB88574...

关键词： arsenic resistance bacteria arsB influx/efflux pump arsenic resistance system (ars) biogeochemical

Performance Study of a Hybrid Heat Pump Dryer based on Numerical Analysis and Experimental Set-up

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Journal of Thermal Science 2021年第1期30卷 111-122页

作者： SHAMSUDDEEN Mohamed Murshid CHA Dong-An kim Seon-chang KANEMOTO Toshiaki kim jin-Hyuk Industrial Technology Korea University of Science&TechnologyDaejeon 34113Republic of Korea Thermal&Fluid System R&D Group Korea Institute of Industrial TechnologyCheonan 31056Republic of Korea Institute of Ocean Energy Saga UniversityHonjo 1Saga 840-8502Japan

Seafood,especially sea cucumbers and oysters are an expensive delicacy in several Asian *** sun-drying of these products takes 3 to 4 days and fetches a lower market *** industrial drying machines used for seafood drying are unable to dry sea cucumbers and oysters without texture and color degradation as they are delicate,temperature-sensitive and have longer drying *** economical drying system that does not cause texture or color degradation is the heat pump drying system and is commonly applied for agriculture and fabric *** this study,the heat pump technology is applied to develop two hybrid dryer models(bottom discharge and front discharge)to dry shellfish and sea cucumbers in large scale for storage and *** model is tested in a laboratory-scale with wet sponges as input material for its dehumidification capacity and the power consumed to attain the target *** front discharge model is found to have rapid drying capability and *** fluid dynamic tools are used to study the hot air flow behavior and flow uniformity inside the drying *** front discharge model showed smooth uniform flow over the trays with fewer losses in the flow *** front discharge model with higher drying rate,lower power consumption and uniform airflow distribution over the trays is chosen for the industrial-scale design.

关键词： heat pump hybrid dryer CFD drying rate sea cucumber oyster

Optimal allocation of random access period for wireless body area network

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Journal of Central South University 2013年第8期20卷 2195-2201页

作者： jin hyuk kim chang ki HONG Sang bang CHOI Department of Electronic Engineering Inha University

A wireless body area network (WBAN) allows integration of low power, invasive or noninvasive miniaturized sensors around a human body. WBAN is expected to become a basic infrastructure element for human health monitoring. The Task Group 6 of IEEE 802.15 is formed to address specific needs of body area network. It defines a medium access control layer that supports various physical layers. In this work, we analyze the efficiency of simple slotted ALOHA scheme, and then propose a novel allocation scheme that controls the random access period and packet transmission probability to optimize channel efficiency. NS-2 simulations have been carried out to evaluate its performance. The simulation results demonstrate significant performance improvement in latency and throughput using the proposed MAC algorithm.

关键词： wireless body area network channel efficiency quality of service low latency

Ni, Co-double hydroxide wire structures with controllable voids for electrodes of energy-storage devices

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Journal of Materials Science & Technology 2020年第20期52卷 126-135页

作者： jin Kyu kim chang Soo Lee Jae Hun Lee Jung Tae Park Jong Hak kim Department of Chemical and Biomolecular Engineering Yonsei University50 Yonsei-roSeodaemun-guSeoul 03722Republic of Korea Department of Chemical Engineering Konkuk University120 Neungdong-roGwangjin-guSeoul 05029Republic of Korea

We re port the facile synthesis of Ni,Co-double hydroxide wire(NCHW)-based electrodes directly grown on a conductive substrate via a hydrothermal *** NCHW nanostructures were grown on Ni foam,and the growth was controlled using different compositions of solvents(ethanol and water).With increasing volume ratio of ethanol to water,the density of the wires decreased,and the spatial voids between the wires *** formation of large empty spaces improved the electrochemical performance because the exposure of a large surface area of the structure to the electrolyte resulted in a large number of active sites and facile electrolyte penetration into the *** different NCHW structures were ascribed to the pivotal role of the solvent in the urea hydrolysis;the solvent triggered the formation of hydroxides during the hydrothermal *** electrochemical performance of the NCHW electrodes was investigated via galvanostatic charge/discha rge tests,cyclic voltammetry,and electrochemical impedance *** highest specific capacitance was 1694.7 m F/cm^2 at 2 mA/cm^2,with excellent capacitance retention of 81.5% after 5000 *** superior electrochemical performance of the NCHW electrodes is attributed to the large number of active sites and facile electrolyte diffusion into the structure,due to the well-organized structure with an optimized density of nanowires and large voids between the wires.

关键词： Ni,Co-double hydroxide Nanowire Electrode Energy-storage device Supercapacitor