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Synthesis and Magnetic Properties of Nanoparticles of Fe-co Alloys and Their Oxides Prepared by chemical Vapor condensation

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journal of Materials Science & Technology 2004年第4期20卷 459-462页

作者： ZhenhuaWANG ZhidongZHANG c.j.choi B.K.kim j.c.kim ShenyangNationalLaboratoryforMaterialsScienceandInternationalcentreforMateri~alsPhysics InstituteofMetalResearchChineseAcademyofSciencesShenyang110016China KoreaInstituteofMachineryandMaterials 66Sangnam-DongChangwonKyungnam641-010Korea

Nanoparticles of Fe-co alloys and their oxides with the particle size below 20 nm were prepared by chemical vapor condensation process. The pure Ar, Ar+1%O2, Ar+3%O2 and Ar+6%O2 were used as carrier gases, with iron carbonyl and cobalt carbonyl as the precursors. XRD patterns showed that Fe-co metallic nanoparticles were synthesized by using pure Ar as carrier gas, and only metal oxides were obtained using Ar+(>3)%O2 as carrier gas. The HRTEM images and TG-DTA curves were used to study the core-shell structure of the different nanoparticles. The nanoparticles obtained in pure Ar consist of black core and light shell with thickness of 2~4 nm. However, in the particles obtained in Ar+6%02, the oxides core with visible lattice fringes are surrounded by thin shell.

关键词： Fe-co Nanoparticles HRTEM cVc

Evaluation of spermatogenesis and fertility in F1 male rats after in utero and neonatal exposure to extremely low frequency electromagnetic fields

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Asian journal of Andrology 2005年第2期7卷 189-194,页

作者： M.K.chung S.j.Lee Y.B.kim S.c.Park D.H.Shin S.H.kim j.c.kim Reproductive Toxicology Division Korea Institute of ToxicologyKorea Research Institute of Chemical TechnologyDaejeon 305-600Korea college of Veterinary Medicine Chungbuk National UniversityCheongju 361-763Korea college of Veterinary Medicine Kyungpook National UniversityDaegu 702-701Korea college of Veterinary Medicine Chonnam National UniversityGwangju 500-757Korea

Aim:To determine whether in utero and neonatal exposure to a 60 Hz extremely low frequency electromagnetic field (EMF) results in spermatotoxicity and reproductive dysfunction in the F1 offspring of ***:Age-matched, pregnant Sprague-Dawley rats were exposed continuously (21 h/day) to a 60 Hz EMF at field strengths of 0 (sham control),5,83.3 or 500 μT from day 6 of gestation through to day 21 of *** experimentally generated magnetic field was monitored continuously (uninterrupted monitoring over the period of the study) throughout the ***:No exposure-related changes were found in exposed or sham-exposed animals with respect to the anogenital distance,preputial separation,testis weight,testicular histology,sperm count,daily sperm production, sperm motility,sperm morphology and reproductive capacity of F1 ***:Exposure of Sprague- Dawley rats to a 60 Hz EMF at field strengths of up to 500 μT from day 6 of gestation to day 21 of lactation did not produce any detectable alterations in offspring spermatogenesis and fertility.

关键词： spermatogenesis electromagnetic fields prenatal exposure postnatal exposure rat

Portable System for cWA Detection Using Micro Array Gas Sensor

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稀有金属材料与工程 2006年第A3期35卷 124-128页

作者： j.H.Kwak Y.T.Lim G.H.kim N.j.choi H.D.Park G.H.Rue j.S.Huh j.c.kim D.D.Lee School of Electrical Engineering and computer Science Kyungpook National UniversityDaegu 1370Korea Electronics and Telecommunications Research Institute Future Technology Research Division New Functional Information Devices TeamGajeongYuseong-GuDaejeon 161 Korea Korea Electronics Technology Institute Yatap-DongBundang-GuSeongnam-SiGyeonggi-Do #68Korea Department of Materials Science and Metallurgy Kyungpook National UniversityDaegu 1370Korea Department of chemical Engineering Kyungpook National UniversityDaegu 1370Korea

Biochemistry weapon is raising new tools of war and *** research is an experiment about portable system for cWAs (chemical warfare agents) detection using micro array gas *** were divided into four types such as blood, nerve,vesicant,and choking *** detect various cWAs,semiconductor thick film sensor array based on tin oxide was fabricated and their gas responses were *** temperature was range of 250℃to 350℃and gas concentration was range of 0.1μg/g to 10μg/*** array was measured as operating temperatures,concentrations for four simulant agents of *** parameters from results were carried out classification among cWAs through the principal component analysis (PcA).Also,classification of gases is studied using adaptive resonance theory (ART) that is one of neural network *** displayed using PDA system.

关键词： SnO2 chemical warfare agents(cWAs) portable system ART array PcA

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c_1化学的新结构单元甲酸甲酯

煤炭综合利用译丛 1990年第4期13卷 51-60,87页

作者： j.S.Lee j.c.kim Y.G.kim 张剑锋化工部化肥研究所

0 前言c_1 化学涉及一碳到多碳的转化,c_1 化学品可从煤及其它碳质材料来的合成气生产。近年因石油危机,c_1 化学普遍受到重视。合成气直接生产化学品虽好但选择性差、条件苛刻。所以一般认为先台成甲醇这种便于运输存贮的物质,再合成... 详细信息

0 前言c_1 化学涉及一碳到多碳的转化,c_1 化学品可从煤及其它碳质材料来的合成气生产。近年因石油危机,c_1 化学普遍受到重视。合成气直接生产化学品虽好但选择性差、条件苛刻。所以一般认为先台成甲醇这种便于运输存贮的物质,再合成化学品更可取。因此,甲醇是 c_1化学的结构单元。甲酸甲酯也能起到这种结构单元作用,不但因其贮运便利,可大规模生产。

关键词：甲酸甲酯 c1化学结构单元合成气

基于FDG代谢参数的模型对预测同时性结直肠癌肝转移术后复发的应用价值

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国际医学放射学杂志 2023年第3期 363-364页

作者： H.S.Lee H.W.Kwon S.B.Lim j.c.kim c.S.Yu Y.S.Hong 吕律

摘要目的应用FDG PET/cT代谢参数构建模型，预测同时性结直肠癌肝转移（ScLM）根治术后复发，并验证模型价值，以改善ScLM病人的预后。方法回顾性分析2006—

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澳大利亚不同品种甜羽扇豆消化能测定及其消化能预测方程的研究进展

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饲料与畜牧（新饲料） 2012年第9期 23-30页

作者： j.c.kim B.P.Mullan j.M.Heo A.Hernandez j.R.Pluske 赵颖中国农业大学动物科技学院

试验选用63头体重49.5±0.5kg的公猪(长白×大白)对不同品种不同生长区域狭长叶羽扇豆的消化能差异进行分析,并根据羽扇豆的物理和化学组分建立消化能的预测方程。试验猪按4×2双因子设计随机分配,4个品种(Belar、coromup、Manudelup和T... 详细信息

试验选用63头体重49.5±0.5kg的公猪(长白×大白)对不同品种不同生长区域狭长叶羽扇豆的消化能差异进行分析,并根据羽扇豆的物理和化学组分建立消化能的预测方程。试验猪按4×2双因子设计随机分配,4个品种(Belar、coromup、Manudelup和Tanjil),2个生长地区(西澳大利亚的南北农业区)。另外,采用小麦对照作为羽扇豆消化能统计的参考。羽扇豆用锤片粉碎机粉碎,用4mm筛片筛选,平均粒度为888μm。试验中日粮能量水平为维持能的3倍[3×(0.458×BW^(0.75))/消化能×0.97],范围从13.3～15.7Mj/kg不等,平均值为14.2Mj/kg。羽扇豆的品种对消化能影响极显著(Pcoromup羽扇豆的高消化能引起的。试验结果表明,在羽扇豆的生长中,遗传因素和环境条件对生长猪利用羽扇豆有显著的影响。简单回归分析表明,消化能的预测可能与豆皮比例[R^2=0.88,相对标准偏差(RSD)=1.11 6,Pj/kg,而且根据羽扇豆的物理和化学特性可预测其消化能值,且精确度高。

关键词：消化能生长地区羽扇豆猪品种

Superplasticity of fine-grained Mg-10Li alloy prepared by severe plastic deformation and understanding its deformation mechanisms

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journal of Magnesium and Alloys 2024年第1期12卷 316-331页

作者： H.T.jeong S.W.Lee W.j.kim Department of Materials Science and Engineering Hongik UniversityMapo-guSangsu-dong 72-1Seoul 121-791Republic of Korea

The superplastic behavior and associated deformation mechanisms of a fine-grained Mg-10.1 Li-0.8Al-0.6Zn alloy(LAZ1011)with a grain size of 3.2μm,primarily composed of the Bccβphase and a small amount of the HcPαphase,were examined in a temperature range of 473 K to 623 *** microstructural refinement of this alloy was achieved by employing high-ratio differential speed *** best superplasticity was achieved at 523 K and at strain rates of 10^(-4)-5×10^(-4)s^(-1),where tensile elongations of 550±600%were *** the heating and holding stage of the tensile samples prior to tensile loading,a significant increase in grain size was observed at temperatures above 573 ***,it was important to consider this effect when analyzing and understanding the superplastic deformation behavior and *** the investigated strain rate range,the superplastic flow at low strain rates was governed by lattice diffusion-controlled grain boundary sliding,while at high strain rates,lattice diffusion-controlled dislocation climb creep was the rate-controlling deformation *** was concluded that solute drag creep is unlikely to *** the late stages of deformation at 523 K,it was observed that grain boundary sliding led to the agglomeration of theαphase,resulting in significant strain *** mechanism maps were constructed forβ-Mg-Li alloys in the form of 2D and 3D formats as a function of strain rate,stress,temperature,and grain size,using the constitutive equations for various deformation mechanisms derived based on the data of the current tests.

关键词： Magnesium-lithium alloy Superplasticity Severe plastic deformation Grain size Grain growth

Hyperreflective photonic crystals created by shearing colloidal dispersions at ultrahigh volume fraction

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Microsystems & Nanoengineering 2024年第1期10卷 161-173页

作者： Minji kim jong Bin kim Shin-Hyun kim Department of chemical and Biomolecular Engineering Korea Advanced Institute of Science and Technology(KAIST)Daejeon 34141Republic of Korea

colloidal crystallization serves as one of the most economic and scalable production methods for photonic ***,insufficient optical performance,nonuniformity and low reproducibility remain challenges for advanced high-value *** this study,we optimally formulate a photocurable dispersion of silica particles and apply shear flow to unify the orientation of the colloidal crystals,ensuring high optical performance and *** silica particles experience strong repulsion at ultrahigh volume fractions of 50%but demonstrate low mobility,leading to polycrystalline *** shear flow to the dispersions allows the silica particles to rearrange into larger crystalline domains with a unidirectional orientation along the *** shear-induced structural change produces absolute reflectivity at the stopband as high as 90%and a high transparency of 90%at off-resonant wavelengths with minimal diffusive ***,the strong interparticle repulsion ensures a uniform volume fraction of particles throughout the dispersion,reducing deviations in the optical *** intricately micropattern the photocurable dispersions using ***,the photonic films and patterns can be stacked to form multiple layers,displaying mixed structural colors and multiple reflectance peaks without sacrificing *** superior photonic materials hold promise for various optical applications,including optical components and anticounterfeiting patches.

关键词： properties. dispersion reflectivity

Boosted Lithium-Ion Transport Kinetics in n-Type Siloxene Anodes Enabled by Selective Nucleophilic Substitution of Phosphorus

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Nano-Micro Letters 2024年第10期16卷 618-637页

作者： Se In kim Woong-ju kim jin Gu Kang Dong-Wan kim School of civil Environmental and Architectural EngineeringKorea University02841 SeoulSouth Korea Nanophotonics Research center Korea Institute of Science and Technology02792 SeoulSouth Korea

Doped two-dimensional(2D)materials hold significant promise for advancing many technologies,such as microelectronics,optoelectronics,and energy ***,n-type 2D oxidized Si nanosheets,namely n-type siloxene(n-SX),are employed as Li-ion battery *** thermal evaporation of sodium hypophosphite at 275℃,P atoms are effectively incorporated into siloxene(SX)without compromising its 2D layered morphology and unique Kautsky-type crystal ***,selective nucleophilic substitution occurs,with only Si atoms being replaced by P atoms in the O_(3)≡Si-H *** resulting n-SX possesses two delocalized electrons arising from the presence of two electron donor types:(i)P atoms residing in Si sites and(ii)H *** doping concentrations are varied by controlling the amount of precursors or their mean free *** at 2000 mA g^(-1),the n-SX electrode with the optimized doping concentration(6.7×10^(19) atoms cm^(-3))delivers a capacity of 594 mAh g^(-1) with a 73%capacity retention after 500 *** improvements originate from the enhanced kinetics of charge transport processes,including electronic conduction,charge transfer,and solid-state *** approach proposed herein offers an unprecedented route for engineering SX anodes to boost Li-ion storage.

关键词： Li-ion battery Two-dimensional N-type siloxene Doping mechanism Kinetics