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Enrichment by air classification of indium components from In-containing scrap powders scraped by sand-blasting chamber shields of sputter coaters

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Rare Metals 2010年第1期29卷 1-8页

作者： Sungkyu Lee Soo-Bok Jeong Hang-Chul Jung Hyun Seon Hong Yongseung Yun Sang Mo Woo Plant Engineering Center Institute for Advanced Engineering633-2 Goan-ri Baegam-myeon Cheoin-gu Yongin-si Gyeonggi-do 449-863 Korea Division of Chemical and Materials Engineering Ajou University 5 Wonchon Youngtong Suwon Gyeonggi-do 443-749 Korea Minerals and Materials Processing Division Korea Institute of Geo-science and Mineral Resources (KIGAM) 30 Gajeong-dong Yuseong-gu Daejeon 305-350 Korea Plant Engineering Center Institute for Advanced Engineering633-2 Goan-ri Baegam-myeon Cheoin-gu Yongin-siGyeonggi-do 449-863 Korea 9 Digit Co. Ltd. 20BL-10L Namdong Industrial Complex428-9 Nonhyeon-dong Namdong-gu Incheon 405-848 Korea

Raw scrap powders containing 10 wt.% In were recovered by sand-blasting chamber shields of sputter coaters and used as a sole source of indium components for both sieving and air-classification. Sieving was performed first as a feasibility test, and enrichment of indium component was possible up to 19 wt.% with a mesh size of 635. With this experimental basis, the raw scrap powders were air-classified into 12 lots according to the revolution per minute （r/min） of a single horizontally arranged classifying wheel： 4000, 6000, 8000, 10000, 12000, and 14000 r/rain. The particle cut size varied from 56 to 5 μm with turbo wheel speeds corresponding to 4000 to 14000 r/min, respectively, and enrichment of indium component was possible in fine overflow fractions at all turbo wheel speeds while the indium components were not concentrated in all of the coarse underflow fractions. The grade of the indium components became higher with decreasing particle size of the air-classified scrap powders, with the highest grade obtained in the fine overflow fraction with a turbo wheel speed of 14000 r/min. The amount of indium in the fine overflow fractions varied between 15.9 wt.% and 31.5 wt.%. All in all, the grade or purity of the indium component improved rather significantly from 15.9 wt.% to 31.5 wt.% by air-classification, but this also resulted in overall decrease in recovery rate from 99.33% to 49.64%. Therefore, enrichment and separation of indium should be optimized for maximum recovery and grade of the indium components, which can be used as raw materials in the subsequent electro-refining processes.

关键词： indium air-classification recycling indium tin oxide gas-cyclone dry dispersion

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Effect of bonding interface on delamination behavior of drawn Cu/Al bar clad material

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中国有色金属学会会刊：英文版 2012年第S3期22卷 645-649页

作者： Sangmok LEE Min-Geun LEE Sang-Pill LEE Geun-Ahn LEE Yong-Bae KIM Jong-Sup LEE Dong-Su BAE Advanced Forming Technology Center Korea Institute of Industrial Technology Department of Advanced Materials Engineering Dong-Eui University Department of Mechanical Engineering Dong-Eui University

Cu/Al bar clad material was fabricated by a drawing process and a subsequent heat *** these processes,intermetallic compounds have been formed at the interface of Cu/Al and have affected its bonding *** of Cu/Al interfaces were observed by OM,SEM and EDX Analyser in order to investigate the bonding properties of the *** to the microstructure a series of diffusion layers were observed at the interface and the thicknesses of diffusion layers have increased with aging time as a result of the diffusion *** interfaces were composed of 3-ply diffusion layers and their compositions were changed with aging time at 400 °*** compositional compounds were revealed to be η2,(θ+η2),(α+θ) intermetallic *** is evident from V-notch impact tests that the growth of the brittle diffusion layers with the increasing aging time directly influenced delamination distance between the Cu sleeve and the Al *** is suggested that the proper holding time at 400 °C for aging as post heat treatment of a drawn Cu/Al bar clad material would be within 1 h.

关键词： drawn Cu/Al bar clad material aging bonding interface intermetallic compound diffusion layer delamination

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Preparation and Characterization of Porous PVdF-HFP/clay Nanocomposite Membranes

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Journal of Materials Science & Technology 2010年第7期26卷 633-638页

作者： Mi Jin Koh Hae Young Hwang Deuk Ju Kim Hyeng Jun Kim Young Taik Hong Sang Yong Nam School of Materials Science and Engineering Engineering Research Institutei-Cube CenterGyeongsang National UniversityJinjuKorea Fuel Cell Research Center Korea Institute of Science and TechnologySeoul 136-791Korea Energy Material Research Center Korea Research Institute of Chemical TechnologyDaejeon 305-600Korea

Polyvinylidene fluoride-hexafluoropropylene （PVdF-HFP） / clay nanocomposite membranes were prepared by phase inversion method through controlling retention time to apply for a lithium ion secondary batteries. Increased membrane porosity with macrovoids was observed at increasing retention time. Partially intercalated structures of PVdF-HFP/clay nanocomposite membranes were confirmed by X-ray diffraction （XRD） analysis. PVdF-HFP membranes containing various kind of clay showed the increase of membrane modulus compared to the pristine PVdF-HFP membrane.

关键词： PVdF-HFP Porosity Mechanical properties Clay Separator

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Injection molding of micro patterned PMMA plate

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Transactions of Nonferrous Metals Society of China 2011年第A01期21卷 148-152页

作者： Yeong-Eun YOO Tae-Hoon KIM Tae-Jin JE Doo-Sun CHOI Chang-Wan KIM Sun-Kyung KIM Department of Nanomanufacturing Technology KIMM 171 Jang-dong Yusung-gu Daejeon 305-343 Korea Department of Product Design and Manufacturing Seoul National University of Technology

A plastic plate with surface micro features was injection molded to investigate the effect of pressure rise of melt on the replication of the micro structures. Prism pattern, which is used in many optical applications, was selected as a model pattern. The prism pattern is 50 μm in pitch and 108° in the vertical angle. The overall size of the plate was 335 minx213 mm and the thickness of the plate varied linearly from 2.6 mm to 0.7 ram. The prism pattern was firstly machined on the nickel plated core block using micro diamond tool and this machined pattern core was installed in a mold for injection molding of prism patterned plate. Polymethyl methacrylate （PMMA） was used as a molding material. The pressure and temperature of the melt in the cavity were measured at different positions in the cavity and the replication of the pattern was also measured at the same positions. The results show that the pressure or temperature profile through the process depends on the shape and the size of the plate. The replication is affected by the temperature and pressure profiles at the early stage of filling, which is right after the melt reaches the position to be measured.

关键词： micro prism pattern injection molding replication pressure profile temperature profile

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Self Localization Method Using Parallel Projection Model for Mobile Sensor in Navigation Applications

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Journal of Computer Science & Technology 2009年第3期24卷 588-603页

作者： Shung Han Cho Yuntai Kyong Sangjin Hong We-Duke Cho Department of Electrical and Computer Engineering Stony Brook University- SUNY Stony Brook NY U.S.A. Department of Electronics Engineering College of Information Technology Ajou University Suwon Korea

This paper presents a novel self localization method using parallel projection model for mobile sensor in navigation applications. The algorithm estimates the coordinate and the orientation of mobile sensor using projected references on visual image. The proposed method considers the lens non-linearity of the camera and compensates the distortion by using a calibration table. The method determines the coordinates and orientations with iterative process, which is very accurate with low computational demand. We identify various sources of error on the coordinate and orientation estimations, and present both static sensitivity analysis of the algorithm and dynamic behavior of the mobile sensor. The algorithm can be utilized in mobile robot navigation as well as positioning application where accurate self localization is necessary.

关键词： mobile sensors localization parallel projection model visual processing

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Optimal Operation of Turbo Blowers Serially Connected Using Inlet Vanes

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Journal of Thermal Science 2011年第1期20卷 26-31页

作者： Choon-Man Jang Plant Research Division Korea Institute of Construction Technology1190 IIsanseo-GuGoyang-Si411-712Korea

Optimal operation of the turbo blowers having an inlet vane has been studied to understand the blowers' operating *** analyze three-dimensional flow field in the turbo blowers serially connected,general analysis code,CFX,is introduced in the present *** turbulence model is employed to estimate the eddy *** the numerical analysis,it is found that the flow rates of the turbo blowers can be controlled at the vane angle between 90 (full open condition) degrees and 60 degrees effectively,because pressure loss rapidly increases below 60 degree of a vane *** also has almost the same values from 90 degrees to 60 degrees of a vane *** is noted that the distorted inlet velocity generated in the small vane angle makes performance deterioration of the turbo blowers due to the local leading edge separation and the following non-uniform blade loading.

关键词： Turbo Blower Inlet Vane Refuse Collection System Efficiency Numerical Simulation

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Optimal Design of Splitters Attached to Turbo Blower Impeller by RSM

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Journal of Thermal Science 2012年第3期21卷 215-222页

作者： Choon-Man Jang Ka-Ram Choi Environmental Engineering Research Division Korea Institute of Construction Technology

This paper describes the optimization of the impeller having splitters for a turbo *** design variables,chord of splitter and pitch of splitter,are introduced to enhance the blower *** pressure and ef-ficiency are selected as an object function,and the optimization of the blower impeller is performed by a response surface method (RSM).Three-dimensional Navier-Stokes equations are introduced to analyze the internal flow of the blower and to find the value of the object function for each *** the shape optimization of the splitters attached to the impeller in the turbo blower,pressure and efficiency at the design flow condition are suc-cessively increased by 5.9 percent and 17.9 percent respectively based on the reference *** higher blower efficiency obtained by optimization of impeller having splitters is mainly caused by reducing the number of im-peller blades and optimal design of splitters in the blade passage while pressure increase keeps almost the same with the reference *** the object function of pressure,pressure increase is obtained at the design and off-design conditions while efficiency keeps higher compared to the reference *** enhancement of blow-er performance is due to the reduction of reverse and circulation flows in the blade passage.

关键词： Turbo Blower Splitter Numerical Simulation Optimal Design Pressure Response Surface Method

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Structural properties of water confined by phospholipid membranes

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Frontiers of physics 2018年第1期13卷 57-64页

作者： Fausto Martelli Hsin-Yu Ko Carles Calero Borallo Giancarlo Franzese Department of Chemistry Princeton University Princeton NJ 08544 USA Seccio de Fisica Estadlstica i Interdisciplinaria-Departament de Fisica de la Materia Condensada Facultat de Fisica Universitat de -Barcelona Mart i Franqus 1 08028 Barcelona Spain Institute of Nanoscience and Nanotechnology (IN2UB) Universitat de Barcelona Av. Joan XXIII S/N 08028 Barcelona Spain

Biological membranes are essential for cell life and hydration. Water provides the driving force for the assembly and stability of many cell components. Here, we study the structural properties of water in a phospholipid membrane. We characterize the local structures, inspecting the intermediate range order （IRO） and adopting a sensitive local order metric recently proposed by Martelli et al. that measures and grades the degree of overlap of the local environment with the structures of perfect ice. Close to the membrane, water acquires a high IRO and changes its dynamical properties; i.e., its translational and rotational degrees of freedom slow in a region that extends over - 1 nm from the membrane interface. Surprisingly, we show that at distances as far as -~ 2.5 mn from the interface, although the bulk-like dynamics are recovered, the IRO of water is still slightly higher than that in the bulk under the same thermodynamic conditions. Therefore, the water-membrane interface has a structural effect at ambient conditions that propagates further than the often-invoked 1-nm length scale. Consequently, this should be considered when analyzing experimental data of water confined by membranes and could help us to understand the role of water in biological systems.

关键词： confined water dimyristoylphosphatidylcholines DMPC order parameter

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Design of 512-bit logic process-based single poly EEPROM IP

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Journal of Central South University 2011年第6期18卷 2036-2044页

作者：金丽妍 JANG Ji-Hye 余忆宁 HA Pan-Bong KIM Young-Hee Department of Electronic Engineering Changwon National University

A single poly EEPROM cell circuit sharing the deep N-well of a cell array was designed using the logic process. The proposed cell is written by the FN tunneling scheme and the cell size is 41.26 μm2, about 37% smaller than the conventional cell. Also, a small-area and low-power 512-bit EEPROM IP was designed using the proposed cells which was used for a 900 MHz passive UHF RFID tag chip. To secure the operation of the cell proposed with 3.3 V devices and the reliability of the used devices, an EEPROM core circuit and a DC-DC converter were proposed. Simulation results for the designed EEPROM IP based on the 0.18μm logic process show that the power consumptions in read mode, program mode and erase mode are 11.82, 25.15, and 24.08 ~tW, respectively, and the EEPROM size is 0.12 mm2.

关键词： single poly EEPROM cell Fowler-Nordheim tunneling logic process radio frequency identification small area

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Robust digital receiver for EPC sensor network

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Journal of Systems Engineering and Electronics 2013年第1期24卷 44-51页

作者： Cheng Jin Sung Ho Cho Department of Electronics and Computer Engineering Hanyang University

A robust digital receiver based on a matched filter （MF） is proposed for the radio frequency identification （RFID） reader system to enhance the reliability of signal processing in the electronic product code （EPC） sensor network （ESN）. The performance of the proposed receiver is investigated by examining the anti-collision algorithm in the EPC global Class1 Generation2 protocol. The validity and usefulness are demonstrated by both computer simulations and experiments. Based on the verification results, comparing with the conventional zero crossing detector （ZCD） based receiver, the proposed receiver is very robust against strong amplitude distortions and considerable frequency deviations happening on the backscattered signal from a passive tag.

关键词： electronic product code (EPC) sensor network (ESN) signal distortion matched filter radio frequency identification (RFID) receiver.

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