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The Formation of Nano-Size Sio_2 Thin Film on an Aluminum Plate with Hexamethyldisilazane (HMDSA) and Hexamethyldisiloxane (HMDSo)

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Journal of Thermal Science 2003年第1期12卷 89-96页

作者： H.k.Ma E.Zhao k.M.chung C.L.Yeh Dept of Mechanical Engineering National Taiwan UniversityDept of Mechanical Engineering National Taiwan UniversityDept of Mechanical Engineering National Taiwan UniversityDept of Mechanical Engineering Da-Yeh University 112 Taipei Taiwan 10764 China Taipei Taiwan 10764 ChinaTaipei Taiwan 10764 ChinaShan-Jeau Rd Dah-Tsuen Chang-Hwa Taiwan 51505 China

This study is using HMDSA (C6H19NSi2) or HMDSo (C6H18oSi2) vapor into C3H8/air premixed flames to form Sio2 thin film on the surface of an aluminum plate. With the addition of HMDSo or HMDSA to premixed flames, an orange secondary flame or a flame brush appeared and was contributed to the formation of Sio2 particles. Based upon the EDS, XPS and FTIR analysis, it is believed that the synthesized products consist of mainly Sio2 and a small amount of Sio. The pure Sio2 crystal structure, was proved by XRD analysis, which may form from the Sio2 amorphous structure after high temperature (1300C) thermal treatment. The nano-size Sio2 particles, which ranged from 2.5-25 nm, are proved by analysis of the BET and TEM. A 2-D CFD-RC code with 12 reduced chemical reaction mechanism, based upon the SIMPLER procedure, was successfully employed to predict the flame temperature and both of the Sio2 and Sio concentration profiles. Compared with the experimental results, the calculated temperature profiles in the post-flame region are in good agreement with the measured data and observation phenomena.

关键词： nano size thin film Sio2.

Effect of Thermal Refining on Mechanical Properties of Annealed SAE 4130 by Multilayer GTAW

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Journal of Iron and Steel Research International 2012年第7期19卷 71-78页

作者： I k Lee C L chung Y T Lee Y T Chien Department of Materials Science and Engineering Da-Yeh University

During the first welding process in manufacturing a precise seam container, the steel material must first undergo a full annealing treatment. Multilayer welding operations are conducted and then applied with refining treatment to obtain the goal by hardening. The influence of thermal refining on mechanical properties of annealed SAE 4130 by multilayer GTAW （gas tungsten arc welding） was discussed. The AW （annealing＋welding） and AWST （annealing＋welding＋solution＋tempering） occurred with a minimum hardness value at GGHAZ （grain growth heat affected zone） due to coarse grain growth~ the hardness occurred with sudden drops between the multilayer welding, but was still larger than the minimum value at HAZ （heat affected zone）. The welded joint efficiency of the AWST was 89.9%, with the elongation reduced to 77.2% of AST （annealing＋solution＋tempering）. The cross section of the tensile samples both appeared with a uniform dimple-shaped structure, and however the necking for AST was greater than that for AWST. The impact value for AWST was 166.5% of AST. Moreover, from microstructure observations, it was found that AWST had a greater tendency to ductile failure than AST. These results can be inferred., the process of steady pressure and the initial position of the precision tube breakage HAZ. However, when stress occurs instantly, HAZ can absorb more energy, therefore the initial damage does not occur.

关键词： thermal refining SAE 4130 multilayer welding GTAW

A Data Transmission Method Using a Cyclic Redundancy Check and Inaudible Frequencies

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Journal of Electronic Science and Technology 2016年第1期14卷 32-36页

作者： Myoungbeom chung the Division of Computer Engineering Sungkyul University

This paper describes a data transmission method using a cyclic redundancy check and inaudible *** proposed method uses inaudible high frequencies from 18 k Hz to 22 k Hz generated via the inner speaker of smart *** the proposed method,the performance is evaluated by conducting data transmission tests between a smart book and smart *** test results confirm that the proposed method can send 32 bits of data in an average of 235 ms,the transmission success rate reaches 99.47%,and the error detection rate of the cyclic redundancy check is0.53%.

关键词： Cyclic redundancy check data transmission method high frequency inaudible frequencies

Bifurcations of limit cycles in a Z_6-equivariant planar vector field of degree 5

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Science China Mathematics 2002年第7期45卷 817-826页

作者：李继彬 H.S.Y.Chan k.W.chung 1. School of Science Kunming University of Science and Technology 650093 Kunming China 2. Department of Mathematics City University of Hong Kong Hong Kong China

A concrete numerical example of Z6-equivariant planar perturbed Hamiltonian polynomial vector fields of degree 5 having at least 24 limit cycles and the configurations of compound eyes are given by using the bifurcation theory of planar dynamical systems and the method of detection functions. There is reason to conjecture that the Hilbert number H(2k + 1) ? (2k + I)2 - 1 for the perturbed Hamiltonian systems.

关键词： Hilbert’s 16th problem limit cycle equivariant vector field method of detection function polynomial system

Stability of a Generalized Quadratic Functional Equation in Schwartz Distributions

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Acta Mathematica Sinica,English Series 2009年第9期25卷 1459-1468页

作者： Jae-Young chung Department of Mathematics Kunsan National University Kunsan 573-701 Republic of Korea

We consider the Hyers-Ulam stability problem of the generalized quadratic functional equationuoA＋voB-2woP1 - 2ko P2 =0, which is a distributional version of the classical generalized quadratic functional equation f（... 详细信息

关键词： Hyers-Ulam stability generalized quadratic functional equation distribution heat kernel

An experimental study on thermal characteristics of nanofluid with graphene and multi-wall carbon nanotubes

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Journal of Central South University 2015年第8期22卷 3202-3210页

作者： A.k.M Mahmudul Haque Sunghyun kwon Junhyo kim Jungpil Noh Sunchul Huh Hanshik chung Hyomin Jeong Department of ocean System Engineering Gyeongsang National University Department of Marine Environmental Engineering Gyeongsang National University Department of Marine Engineering Mokpo National Maritime University Department of Energy and Mechanical Engineering Gyeongsang National UniversityInstitute of Marine Industry

High-thermal conductivity enhancement of nanofluid is one of the promising topics of the nanoscience research field. This work reports the experimental study on the preparation of graphene(GN) and multi-walled carbon nanotubes(MWCNTs) based nanofluids with the assistance of sodium dodecyl benzene sulfonate(SDBS) and sodium dodecyl sulfate(SDS) surfactants, and their thermal behaviors. The present work suggests not a solution, but a solution approach and deduces a new conclusion by trying to resolve the agglomeration problem and improve the dispersibility of nanoparticles in the base fluid. The analysis results of FESEM, thermal conductivity, diffusivity, effusivity and heat transfer coefficient enhancement ratio of nanofluid with surfactants SDS and SDBS expose strong evidence of the dispersing effect of surfactant on the making of nanofluid.

关键词： graphene carbon nanotube surfactant dispersibility thermal conductivity

Fluorescence lifetime imaging of molecular rotors to map microviscosity in cells

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Chinese optics Letters 2010年第10期8卷 926-930页

作者： James A. Levitt Marina k. kuimova Gokhan Yahioglu Pei-Hua chung klaus Suhling David Phillips Department of Physics King's College London Department of Chemistry Imperial College London PhotoBiotics Ltd.

Fluorescence liftime imaging （FLIM） of modified hydrophobic bodipy dyes that act as fluorescent molecular rotors shows that the fluorescence lifetime of these probes is a function of the microviscosity of their environment. Incubating cells with these dyes, we find a punctate and continuous distribution of the dye in cells. The viscosity value obtained in what appears to be endocytotic vesicles in living cells is around 100 times higher than that of water and of cellular ***-resolved fluorescence anisotropy measurements also yield rotational correlation times consistent with large microviscosity values. In this way, we successfully develop a practical and versatile approach to map the microviscosity in cells based on imaging fluorescent molecular rotors.

关键词： Fluorescence lifetime imaging of molecular rotors to map microviscosity in cells

overexpression of the promyelocytic leukemia gene suppresses growth of human bladder cancer cells by inducing Gl cell cycle arrest and apoptosis

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Chinese Medical Journal 2003年第9期116卷 1394-1398页

作者：贺大林南勋义 Chang kun-Song 王亚峰 chung Leland W.k. Department of Urology First Hospital Xi'an Jiaotong UniversityXi'an 710061 China Division of Laboratory Medicine University of Texas MD Anderson Cancer Center USA Department of Urology University of Virginia USA

objectives To examine the anti-oncogenic effects of promyelocytic leukemia (PML) on bladder cancer and to explore its molecular mechanisms of growth *** Wild-type PML was transfected into bladder cancer cells (5637 cell) and expressed in a replication-deficient adenovirus-mediated gene delivery system and introduced into human bladder cancer cells (5637 cell) in vitro and in vivo. The effect and mechanisms of the PML gene in cell growth, clonogenicity, and tumorigenicity of bladder cancer cells were studied using in vitro and in vivo growth assays, soft agar colony-forming assay, cell cycle analysis, apoptosis assay and in vivo tumorigenicity *** overexpression of PML in 5637 cells significantly reduced their growth rate and clonogenicity on soft agar. PML suppressed bladder cancer cell growth by inducing G1 cell cycle arrest and apoptosis. Adenovirus-mediated PML ( Ad-PML) significantly suppressed the tumorigenicity and growth of bladder cancer cells. Intratumoral injection of Ad-PML into tumors induced by 5637 cells dramatically suppressed their *** The results indicated that overexpression of PML protein may promote efficient growth inhibition of human bladder cancer cells by inducing G1 cell cycle arrest and apoptosis, and adenovirus-mediated PML (Ad-PML) expression efficiently suppresses human bladder cancer growth.

关键词： bladder neoplasms.leukemia promyelocytic.G1 arrest .apoptosis

Finite Capacitive Response at the Quantum Hall Plateau

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Chinese Physics Letters 2022年第9期39卷 53-56页

作者：赵利利林文璐 Y.J.chung k.W.Baldwin L.N.Pfeiffer 刘阳 International Center for Quantum Materials Peking UniversityBeijing 100871China Department of Electrical Engineering Princeton UniversityPrincetonNew Jersey 08544USA

We study ultra-high-mobility two-dimensional(2D)electron/hole systems with high precision capacitance *** is found that the capacitance charge appears only at the fringe of the gate at high magnetic field when the 2D conductivity decreases *** integer quantum Hall effects,the capacitance vanishes and forms a plateau at high temperatures T≥300 m k,which surprisingly disappears at T≤100 m *** anomalous behavior is likely a manifestation that dilute particles/vacancies in the top-most Landau level form Wigner crystals,which have finite compressibility and can host polarization current.

关键词： capacitance integer dilute