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超声随访中可能良性乳腺病灶的间歇生长：怎样处理这些病灶？

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国际医学放射学杂志 2011年第4期34卷 392-408页

作者： H.j.Moon E.K.Kim j.y.kwak j.H.yoon M.j.Kim 余华君 Department of Radiology Research Institute of Radiological ScienceYonsei University College of Medicine

目的调查在随访超声（US）中间隔生长的可能良性病灶的恶性率,以及预测恶性病灶的临界值。方法回顾性复习被评估为可能良性病灶的19432例US检查资料,199例病人中共有214个间隔生长的病灶被纳入该研究。

关键词：乳腺肿瘤不确定肿块超声监测活检

甲状腺小结节的诊断与管理:甲状腺结节6项指南的比较研究

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国际医学放射学杂志 2017年第4期 467-468页

作者： j.H.yoon K.Han E.K.Kim H.j.Moon j.y.kwak 赵智勇 Department of Radiology Severance HospitalResearch Institute of Radiological Science Yonsei UniversityCollege of Medicine

摘要目的探讨6项指南的诊断效果,以便用于评估甲状腺结节并确定这些指南中是否可辨别出人群中的恶性甲状腺癌。材料与方法纳入2007年3月—2010年2月共4 696个甲状腺结节。基于细胞学结果为基础,4 585例病人共4 696个1;cm的甲状腺结节被...

摘要目的探讨6项指南的诊断效果,以便用于评估甲状腺结节并确定这些指南中是否可辨别出人群中的恶性甲状腺癌。材料与方法纳入2007年3月—2010年2月共4 696个甲状腺结节。基于细胞学结果为基础,4 585例病人共4 696个1;cm的甲状腺结节被明确诊断为良性或恶性。回顾性分析甲状腺结节的超声检查及以先前发布的甲状腺

关键词：

灰阶超声和弹性成像在实性甲状腺结节中的诊断表现

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国际医学放射学杂志 2012年第3期 276-277页

作者： H.j.Moon j.M.Sung E.K.Kim j.H.yoon j.H.youk j.y.kwak 乔辉 Department of Radiology Research Institute of Radiological ScienceYonsei University College of Medicine250 SeongsannoSeodaemun-gu120-752 SeoulKorea

目的评价灰阶超声(US)和弹性成像在鉴别甲状腺良、恶性结节中的诊断表现。材料与方法这是一个经机构审查委员会批准的有知情同意放弃的回顾性研究。总共包括676例病人的703个实性甲状腺结节(年龄18～79岁,平均49.7岁),其中女性556例(年... 详细信息

目的评价灰阶超声(US)和弹性成像在鉴别甲状腺良、恶性结节中的诊断表现。材料与方法这是一个经机构审查委员会批准的有知情同意放弃的回顾性研究。总共包括676例病人的703个实性甲状腺结节(年龄18～79岁,平均49.7岁),其中女性556例(年龄20～74岁,平均49.5岁),男

关键词：灰阶超声弹性成像结节甲状腺粒子肉内分泌腺实性

微钙化特征的显示:全景乳腺数字钼靶摄影中数字监视器变焦能否替代放大乳腺钼靶摄影术?

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国际医学放射学杂志 2009年第2期32卷 201-202页

作者： M.j.Kim E.K.Kim j.y.kwak E.j.Son j.H.youk S.H.Choi 高欣 Department of Radiology Research Institute of Radiological ScienceYonsei University Health System

本研究目的是比较变焦数字接触式乳腺钼靶摄影术和数字放大乳腺钼靶摄影术对微钙化的成像质量及诊断准确性。3位具有不同乳腺钼靶诊断水平的放射学专家，运用全景数字乳腺钼靶成像系统，分别观察数字放大乳腺钼靶（MAG）图像和经市售的... 详细信息

本研究目的是比较变焦数字接触式乳腺钼靶摄影术和数字放大乳腺钼靶摄影术对微钙化的成像质量及诊断准确性。3位具有不同乳腺钼靶诊断水平的放射学专家，运用全景数字乳腺钼靶成像系统，分别观察数字放大乳腺钼靶（MAG）图像和经市售的监视器上的变焦系统对接触式乳腺钼靶摄影（ZOOM）进行放大的图像，对111例病人的120个成簇的微钙化进行分析。

关键词：乳腺钼靶摄影术微钙化放大数字乳腺钼靶摄影术变焦

Construction of 2D/2D Ti_(3)C_(2)T_(x)MXene/CdS heterojunction with photothermal effect for efficient photocatalytic hydrogen production

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journal of Materials Science & Technology 2024年第4期171卷 1-9页

作者： T.y.Huang Z.yang S.y.yang Z.H.Dai y.j.Liu j.H.Liao G.y.Zhong Z.j.Xie y.P.Fang S.S.Zhang Key Laboratory for Biobased Materials and Energy of Ministry of Education Guangdong Laboratory for Lingnan Modern AgricultureCollege of Materials and EnergySouth China Agricultural UniversityGuangzhou 510643China School of Physics and Optoelectronics South China University of TechnologyGuangzhou 510640China School of Chemical Engineering and Energy Technology Guangdong Provincial Key Laboratory of Distributed Energy SystemsDongguan University of TechnologyDongguan 523808China

The insensitivity of semiconductors to visible and infrared light is a key constraint on the utilization of light energy in photocatalytic *** photocatalysts with full-spectrum absorption through surface engineering is an effective approach to fully harnessing light energy in semiconductor ***,a novel stable Ti_(3)C_(2)T_(x)MXene/CdS heterojunction catalyst is obtained by in-situ epitaxial growth of two-dimensional(2D)CdS nanosheets on 2D MXene interface via a solvothermal *** exceptional light absorption properties of MXene confer outstanding full-spectrum driven photocat-alytic hydrogen evolution capability upon the heterogeneous *** unique 2D/2D structure effectively mitigated the recombination of photogenerated carriers,enhancing the photocatalytic performance of the ***,the composite catalyst exhibits a significantly higher surface temperature of 80.4℃under visible light irradiation at an intensity of 0.1 W/cm^(2),which is 1.84 times higher than that of *** irradiation of visible and near infrared light,the composite catalyst with photothermal ef-fect demonstrates a remarkable hydrogen evolution rate of 65.4 mmol g^(-1)h^(-1),which is 7.2 times higher than that of CdS *** study introduces a novel approach for constructing full-spectrum absorption catalysts and expands the application of the photothermal effect in photocatalytic hydrogen evolution research.

关键词： Two-dimensional structure Heterostructure Photothermal effect Photocatalyst Hydrogen evolution

Supposition of graphene stacks to estimate the contact resistance and conductivity of nanocomposites

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Applied Mathematics and Mechanics(English Edition) 2024年第4期45卷 663-676页

作者： y.ZARE M.T.MUNIR G.j.WENG K.y.RHEE Biomaterials and Tissue Engineering Research Group Department of Interdisciplinary TechnologiesBreast Cancer Research CenterMotamed Cancer InstituteTehran ***Iran College of Engineering and Technology American University of the Middle EastEgaila 54200Kuwait Department of Mechanical and Aerospace Engineering Rutgers UniversityNew BrunswickNJ 08903U.S.A. Department of Mechanical Engineering(BK21 Four) College of EngineeringKyung Hee UniversityYongin 446701Republic of Korea

In this study,the effects of stacked nanosheets and the surrounding interphase zone on the resistance of the contact region between nanosheets and the tunneling conductivity of samples are evaluated with developed equations superior to those previously *** contact resistance and nanocomposite conductivity are modeled by several influencing factors,including stack properties,interphase depth,tunneling size,and contact *** developed model's accuracy is verified through numerous experimental *** further validate the models and establish correlations between parameters,the effects of all the variables on contact resistance and nanocomposite conductivity are ***,the contact resistance is primarily dependent on the polymer tunnel resistivity,contact area,and tunneling *** dimensions of the graphene nanosheets significantly influence the conductivity,which ranges from 0 S/m to90 S/*** increased number of nanosheets in stacks and a larger gap between them enhance the nanocomposite's ***,the thicker interphase and smaller tunneling size can lead to higher sample conductivity due to their optimistic effects on the percolation threshold and network efficacy.

关键词： graphene polymer composite stacked nanosheet tunneling conductivity contact resistance interphase

On von Neumann Regularity of Commutators

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Algebra Colloquium 2024年第2期31卷 181-198页

作者： Nam Kyun Kim Tai Keun kwak yang Lee Sung ju Ryu Nanqing Ding School of Basic Sciences Hanbat National UniversityDaejeon 34158Korea Department of Data Science Daejin UniversityPocheon 11159Korea Department of Mathematics Yanbian UniversityYanjiJilin 133002China Institute for Applied Mathematics and Optics Hanbat National University Daejeon 34158Korea Department of Mathematics Pusan National UniversityBusan 46241Korea 不详

We study the structure of rings which satisfy the von Neumann regularity of commutators,and call a ring R C-regularif ab-ba ∈(ab-ba)R(ab-ba)for all a,b in *** a C-regular ring R,we prove j(R[X])=N^(*)(R[X])=N^(*)(R)[X]=W(R)[X]■Z(R[X]),where j(A),N^(*)(A),W(A),Z(A)are the jacobson radical,upper nilradical,Wedderburn radical,and center of a given ring A,respectively,and A[X]denotes the polynomial ring with a set X of commuting indeterminates over A;we also prove that R is semiprime if and only if the right(left)singular ideal of R is *** provide methods to construct C-regular rings which are neither commutative nor von Neumann regular,from any given ***,for a C-regular ring R,the following are proved to be equivalent:(i)R is Abelian;(ii)every prime factor ring of R is a duo domain;(ii)R is quasi-duo;and(iv)R/W(R)is reduced.

关键词： C-regular ring commutator regular ring commutative ring radical singular ideal

Thermo-kinetic characteristics on stabilizing hetero-phase interface of metal matrix composites by crystal plasticity finite element method

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journal of Materials Science & Technology 2024年第2期169卷 53-67页

作者： y.B.Zhang S.j.Song F.Liu State Key Laboratory of Solidification Processing Northwestern Polytechnical UniversityXi’an 710072China Analytical&Testing Center Northwestern Polytechnical UniversityXi’an 710072China

Using dislocation-based constitutive modeling in three-dimension crystal plasticity finite element(3D CPFE)simulations,co-deformation and instability of hetero-phase interface in different material systems were herein studied for polycrystalline metal matrix composites(MMCs).Local stress and strain fields in two types of 3layer MMCs such as fcc/fcc Cu-Ag and fcc/bcc Cu-Nb have been predicted under simple compressive ***,more severe strain-induced interface instability can be observed in the fcc/bcc systems than in the fcc/fcc systems upon refining to metallic nanolayered composites(MNCs).By detailed analysis of stress and strain localization,it has been demonstrated that the interface instability is always accompanied by high-stress concentration,i.e.,thermodynamic characteristics,or high strain prevention i.e.,kinetic characteristics,at the hetero-phase *** then follows that the thermodynamic driving forceG and the kinetic energy barrier Q during dislocation and shear banding can be adopted to classify the deformation modes,following the so-called thermo-kinetic *** by inserting a high density of high-energy interfaces into the Cu-Nb composites,such thermo-kinetic integration at the hetero-phase interface allows a successful establishment of MMCs with the high△G-high Q deformation mode,which ensures high hardening and uniform strain distri-bution,thus efficiently suppressing the shear band,stabilizing the hetero-phase interface,and obtaining an exceptional combination in strength and *** hetero-phase interface chosen by a couple of thermodynamics and kinetics can be defined as breaking the thermo-kinetic correlation and has been proposed for artificially designing MNCs.

关键词： Thermodynamics and kinetics Physics-based constitutive modeling Hetero-phase interface Crystal plasticity finite element

Optimization of chemistry and process parameters for control of intermetallic formation in Mg sludges

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journal of Magnesium and Alloys 2024年第4期12卷 1431-1448页

作者： y.Fu G.G.Wang A.Hu y.Li K.B.Thacker j.P.Weiler H.Hu Department of Mechanical Automotive and Materials EngineeringUniversity of Windsor401 Sunset AveWindsorOntario N9B 3P4Canada Global Technology Centre Meridian Lightweight Technologies25 MacNab AveStrathroyOntario N7G 4H6Canada

Intermetallic formation in sludge during magnesium(Mg)melting,holding and high pressure die casting practices is a very important ***,very often it is overlooked by academia,original equipment manufacturers(OEM),metal ingot producers and even die *** aim of this study was to minimize the intermetallic formation in Mg sludge via the optimization of the chemistry and process *** Al8Mn5 intermetallic particles were identified by the microstructure analysis based on the Al and Mn *** design of experiment(DOE)technique,Taguchi method,was employed to minimize the intermetallic formation in the sludge of Mg alloys with various chemical compositions of Al,Mn,Fe,and different process parameters,holding temperature and holding *** sludge yield(Sy)and intermetallic size(IS)was selected as two *** optimum combination of the levels in terms of minimizing the intermetallic formation were 9 wt.%Al,0.15 wt.%Mn,0.001 wt.%(10 ppm)Fe,690℃ for the holding temperature and holding at 30 mins for the holding time,*** best combination for smallest intermetallic size were 9 wt.%Al,0.15 wt.%Mn,0.001 wt.%(10 ppm)Fe,630℃ for the holding temperature and holding at 60 mins for the holding time,*** groups of sludge factors,Chemical Sludge(CSF),Physical Sludge(PSF)and Comprehensive Sludge Factors(and CPSF)were established for prediction of sludge yields and intermetallic sizes in Al-containing Mg *** CPSF with five independent variables including both chemical elements and process parameters gave high accuracy in prediction,as the prediction of the PSF with only the two processing parameters of the melt holding temperature and time showed a relatively large deviation from the experimental *** Chemical Sludge Factor was primarily designed for small ingot producers and die casters with a limited melting and holding capacity,of which process parameters could be fixed *** Physical Sludge Factor could be used f

关键词： Magnesium sludge Al-Mn intermetallic Optimization Taguchi method Sludge factor Chemical composition Process parameter