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Computational study on influence of RF shielding box on inductance of coil

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Plasma science and Technology 2019年第6期21卷 23-28页

作者： s J KIM J J lee y s lee J H KIM s J yOU Applied Physics lab for PLasma Engineering(APPLE) Department of Physics Chungnam National University Daejeon 34134 Republic of Korea Korea Research Institute of standards and science(KRIss) Daejeon 34113 Republic of Korea

Despite the fact that a radio frequency (RF) shielding box affects a coil inductance used in matching network,RF engineers have used a coil inductance measured in open space on designing matching networks since it is difficult to precisely measure the coil inductance within the RF shielding *** this work,we investigate the influences of the RF shielding box on the coil inductance via a 3D full electromagnetic wave *** results shows that the coil inductance decreases from-6.0% to-11.9% compared with its ideal inductance depending on coil positions within the RF shielding *** inductive and capacitive coupling between the coil and surfaces of the RF shielding box contribute to the reduction of the coil *** expect that these results would be useful for those who design RF matching networks.

关键词： 3D full EM wave simulation RF matching component RF shield inductive and capacitive coupling

Influence of Carrier Gas on Analysis of MgO Powders by Laser Ablation Inductively Coupled Plasma Mass spectrometry

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Journal of Materials science & Technology 2009年第3期25卷 333-335页

作者： J.s. lee y.s. lee C.J. Park H.s. lee D.s. lee Department of Chemistry Yonsei University Material Analysis Team Korea Testing Laboratory Korea Research Institute of standards and science school of Material science and Engineering Pusan National Univirsity

Laser ablation inductively coupled plasma mass spectrometry （LA-ICP-Ms） has been widely adopted for the direct multi-elemental analysis with high sensitivity. Especially analysis of fine ceramics by LA-ICP-Ms without time-consuming sample decomposition process has been one of the most expecting application field. small additive elements in MgO powders were analyzed by LA-ICP-Ms. For precise and accurate analysis influence of carrier gas （Ar or He） was presented by the signal intensities of ICP-Ms, relative standard deviation of signal intensities and ablated particle size distribution. Ablated particles were collected and analyzed by scanning electron microscopy （sEM） to investigate the particle size distribution, and the ablated sample surface was examined by camscope. In He gas atmosphere, the signal was more stable than in Ar gas atmosphere. The signal intensity was higher in Ar than in He. Examination of ablated particles and sample surface reveals that more particles were generated in Ar atmosphere and the distribution of particle size was larger.

关键词： Laser ablation MgO powders Carrier gas ICP-Ms

Emissions of Er3+ and yb3+ co-doped srZrO3 nanocrystals under near-infrared and near-ultraviolet excitations

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Journal of Advanced Ceramics 2020年第4期9卷 413-423页

作者： Hyeontae Lim Juyeong Lim soyoung Jang y.s.lee Department of Physics Soongsil UniversitySeoul06978Republic of Korea

In this study,the upconversion(UC)emissions of Er3+and yb3+co-doped srZrO3 nanocrystals(NCs)were investigated in terms of the thermal annealing temperature and concentration of Er3+ions and compared with the emissions under a near-ultraviolet(near-UV)*** NCs were synthesized by the combustion method,and the as-synthesized NCs were post-annealed at high *** X-ray diffraction patterns revealed that the grain sizes and crystallinity degrees of the samples increased with increasing annealing *** photoluminescence spectra of our samples exhibited strong green and very weak red emissions with the near-UV excitation,originating from the f-f transitions in the Er3+***,under near-infrared(near-IR)excitation,we identified sizable visible emissions at 525,547,and 660 nm in our NCs,which indicated that the UC process successfully occurred in our *** UC emissions were maximized in the NCs with an Er3+concentration of 0.02 and thermal annealing at 1000°*** found that the intensity ratios of red to green emissions increased with increasing annealing *** discussed the differences in the emissions between near-UV and near-IR excitations.

关键词： Er3+and yb3+co-doped srZrO3 upconversion downshifting nanocrystals combustion method annealing temperature

The search for the Quantum spin Liquid in Kagome Antiferromagnets

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Chinese Physics Letters 2019年第5期36卷 5-6页

作者： J.-J.Wen y.s.lee stanford Institute for Materials and Energy sciences SLAC National Accelerator Laboratory Department of Applied Physics Stanford University

A quantum spin liquid (QsL) is an exotic quantum ground state that does not break conventional symmetries and where the spins in the system remain dynamic down to zero temperature. Unlike a trivial paramagnetic state,... 详细信息

关键词： The search for the Quantum spin Liquid in Kagome Antiferromagnets Zn

Plasma density measurement and downstream etching of silicon and silicon oxide in Ar/NF3 mixture remote plasma source

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Plasma science and Technology 2019年第6期21卷 52-57页

作者： H J yEOM D H CHOI y s lee J H KIM D J sEONG s J yOU H C lee Korea Research Institute of standards and science(KRIss) Daejeon 34113 Republic of Korea Department of Physics Chungnam National University Daejeon 34134 Republic of Korea

In this study,plasma density measurements were performed near the plume region of the remote plasma source (RPs) in Ar/NF3 gas mixtures using a microwave cutoff *** measured plasma density is in the range of 1010-1011 cm-3 in the discharge conditions with RPs powers of 2-4 kW and gas pressures of 0.87-4 *** plasma density decreased with increasing gas pressures and RPs powers under various Ar/NF3 mixing *** decrease in the plasma density measured at the fixed measurement position (plume region) can be understood by the reduction of the electron energy relaxation length with increases in the gas pressures and mixing ratio of NF3/(Ar/NF3).We also performed downstream etching of silicon and silicon oxide films in this *** etch rate of the silicon films significantly increases while the silicon oxide is slightly etched with the gas pressures and *** was also found that the etch rate strongly depends on the wafer position on the processing chamber electrode,and that the etch selectivity reached 96-131 in the discharge conditions of RF powers (3730-4180 W) and gas pressures (3.6-4 Torr).

关键词： remote plasma source electron density cutoff probe downstream etch

Analysis of Unstable Chromosome Aberrations in simulation of Partial Body Exposures with Gamma Rays

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Journal of Environmental science and Engineering 2010年第12期4卷 18-27页

作者： M. syaifudin y. Lusiyanti y.s. lee C.M. Kang Center for Technology of Radiation safety and Metrology National Nuclear Energy Agency Jl. Lebakbulus Raya No. 49 PO BOX 7043 JKSKL Jakarta Selatan 12070 Indonesia Laboratory of Radiation Effects Korea Institute of Radiological and Medical Sciences （K1RAMS） 215-4 Gongneung-Dong Nowon-Ku Seoul Republic of Korea Laboratory of Radiation Cytogenetics and Epidemiology Korea Institute of Radiological and Medical Sciences （KIRA MS） 215-4 Gongneung-Dong Nowon-Ku Seoul Republic of Korea

Accidentally or occupationally exposures to ionizing radiation generally involving the partial-body exposures and this may pose significant health hazards that are indicated by chromosome aberration （CA） induction. In this experiment, the quantification of the frequencies of CA was carried out based on cytogenetic analyses of peripheral blood samples obtained from 4 healthy volunteers as a result of simulation of partial-body exposures. The percentages of mixtures of blood samples irradiated in vitro with 2 Gy of gamma rays were 10, 25, 50, 75 and 100.0%. Lymphocytes were cultured and first-division metaphase cells were collected after culture times of 48 h and then harvested with standard procedures. The results showed that frequencies of unstable CA were depended on the percentage/portion of irradiated blood. All frequencies of observed CA was lower than that of calculated from 100% exposed blood, except in one case, indicating a phenomena of＂dilution＂ of unirradiated into irradiated lymphocytes though there could be a bystander effects taken place. The increasing in frequency for 25-100% portions was also comparable with other similar experiments. The quantification of CAs in lymphocytes is an important methodology of dose assessment for partial-body exposure to ionizing radiation, however, the scenario of exposure should be determined.

关键词： Unstable chromosome aberrations biological dosimetry partial-body irradiation lymphocyte

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有源钳位准谐振变换器的一种简单驱动电路

电力电子技术 1999年第1期33卷 48-50页

作者：林波涛丘水生 y.s.lee 华南理工大学香港理工大学

提出了有源钳位准谐振变换器的一种新的驱动方式，它无需经过数字电路延时，只需一个电阻和二极管构成的小网络。新的驱动方法简单易用，简化了设计，降低了成本。实验结果表明新方案有效。

关键词：变换器准谐振变换器驱动电路 MOsFET

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加速器物理学第2版英文影印版

加速器物理学第2版英文影印版

A Robust Approach for the Derivation of Closed-Form Green’s Functions for Microstrip structures

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作者：（美）s.y.lee

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A Robust Approach for the Derivation of Closed-Form Green’s...