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China Foundry 2024年第3期21卷 276-286页

作者： Ajith Bandara Koichi Kan Katanaga y.suke Natsuto Soga Akifumi Koike Toru aoki Hamamatsu TSC Chuo Hatsumei Institute322 lida-choMinami-kuHamamatsu435-0028Japan Graduate School of Medical Photonics ShizuokaUniversityJohoku 3-5-1HamamatsuShizuoka432-8561Japan ANSeeN Inc Johoku 3-5-1HamamatsuShizuoka432-8561Japan Research Institute of Electronics ShizuokaUniversityJohoku 3-5-1HamamatsuShizuoka432-8561Japan

Utilizing lightweight Al alloy. in various industrial applications requires achieving precise pressure tightness and leak *** pressure impregnation(VPI)with thermosetting poly.ers is commonly.used to address leakage defects in die-cast Al *** this study.the efficacy.of the VPI technique in sealing alloy.parts was investigated using a combination of nondestructive micro X-ray.computed tomography.micro XCT)and a standard leak *** results demonstrate that the commonly.used water leak test is insufficient for determining the sealing ***,micro XCT shows distinct advantages by.enabling more comprehensive *** reveals the presence of a low atomic number impregnates sealant within casting defects,which has low grey.contrast and allows for visualizing primary.leakage paths in *** effective atomic number of impregnated resin is 6.75 and that of Al alloy.is 13.69 by.dual-energy.X-ray.*** research findings will contribute to enhancing the standard VPI process parameters and the properties of impregnating sealants to improve quality.assurance for impregnation in industrial metals.

关键词： nondestructive testing Al alloy.die-casting vacuum pressure impregnation micro X-ray.computed tomography duel-energy.X-ray.CT

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耐久性试验中组合翼型结构的健康监测

钢结构 2008年第2期23卷 79-80页

作者： S. Takeda y. aoki T. Ishikawa N. Takeda H. Kikukawa

将光纤传感器应用于翼型结构,以此进行翼型结构耐久性的长期监测。耐久性试验包括服务于飞行器寿命设计的失重试验和两周期疲劳荷载试验。7个光纤传感器被安装在试件表面,监测冲击损伤和疲劳荷载对构件的影响。通过传感器输出的光谱变... 详细信息

将光纤传感器应用于翼型结构,以此进行翼型结构耐久性的长期监测。耐久性试验包括服务于飞行器寿命设计的失重试验和两周期疲劳荷载试验。7个光纤传感器被安装在试件表面,监测冲击损伤和疲劳荷载对构件的影响。通过传感器输出的光谱变化可以判定出冲击损伤程度。疲劳试验中的应变变化可以通过分析传感器输出的光谱中波长的变化测量出来。试验板的损伤发展过程同样可以通过无损检测技术测量出来(利用声发射传感器,它是一种超声波和脉冲扫描仪)。与无损检测结果相比,光纤传感器可以输出翼型结构完整而又相当重要的监测信息。结果表明,光纤传感器具有对大型混合结构进行长期监测的能力。

关键词：健康监测光纤传感器无损检测组合翼型结构

MAVEN observation of magnetosonic waves in the Martian magnetotail region

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Earth and Planetary.Phy.ics 2024年第2期8卷 317-325页

作者： ShangChun Teng JiCheng Sun JiaWei Gao y.Harada Markus Fraenz DeSheng Han State Key.Laboratory.of Marine Geology School of Ocean and Earth ScienceTongji UniversityShanghai 200092China MNR Key.Laboratory.for Polar Science Polar Research Institute of ChinaShanghai 200136China Key.Laboratory.of Earth and Planetary.Phy.ics Institute of Geology and GeophysicsChinese Academy of SciencesBeijing 100029China College of Earth and Planetary.Sciences University of Chinese Academy of SciencesBeijing 100049China Department of Geophy.ics Kyoto UniversityKyotoJapan Max-Planck-Institute for Solar Sy.tem Research GoettingenGermany

Magnetosonic waves are an important medium for energy.transfer in collisionless space *** waves have been widely.investigated in the upstream of the bow shock at *** waves are believed to originate from pickup ions or reflected *** utilizing MAVEN spacecraft data,we have observed the occurrence of quasi-perpendicularly.propagating magnetosonic emissions near the proton gy.ofrequency.in the Martian magnetotail *** plasma waves are associated with a significant enhancement of proton and oxy.en *** excited magnetosonic waves could possibly.heat the protons through resonance and facilitate the ionospheric plasma *** results could be helpful to better understand the Mars’magnetospheric dy.amics and offer insights into possible energy.redistribution between waves and plasma in the Martian nightside magnetosphere.

关键词： Martian magnetotail region magnetosonic waves proton escape

Ren-integrable and ren-sy.metric integrable sy.tems

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Communications in Theoretical Phy.ics 2024年第3期76卷 62-69页

作者： S y.Lou School of Phy.ical Science and Technology Ningbo UniversityNingbo315211China

A new ty.e of sy.metry.ren-sy.metry.describing any.n phy.ics and corresponding topological phy.ics,is ***-sy.metry.is a generalization of super-sy.metry.which is widely.applied in super-sy.metric phy.ics such as super-sy.metric quantum mechanics,super-sy.metric gravity.super-sy.metric string theory.super-sy.metric integrable sy.tems and so *** and Grassmann numbers are,in some sense,dual conceptions,and it turns out that these conceptions coincide for the ren situation,that is,a similar conception of ren-number(R-number)is devised for *** particular,some basic results of the R-number and ren-sy.metry.are exposed which allow one to derive,in principle,some new ty.es of integrable sy.tems including ren-integrable models and ren-sy.metric integrable *** examples of ren-integrable KdV-ty.e sy.tems and ren-sy.metric KdV equations are explicitly.given.

关键词： sy.metries integrable sy.tems any.n phy.ics extended supersy.metry ren-sy.metry

Dy.amic of Scalar Bosons in Aharonov-Bohm Magnetic Field

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Journal of Applied Mathematics and Phy.ics 2024年第1期12卷 268-276页

作者： Frédéric D. y. Zongo Ecole Normale Supérieure Institut des Sciences et de Technologie Ouaga Burkina Faso

We study.the dy.amic of scalar bosons in the presence of Aharonov-Bohm magnetic field. First, we give the differential equation that governs this dy.amic. Secondly. we use variational techniques to show that the following Schrödinger-Newton equation: , where A is an Aharonov-Bohm magnetic potential, has a unique ground-state solution.

关键词： Scalar Boson Aharonov-Bohm Magnetic Field Schrödinger-Newton Equation Ground-State Solution

Green hy.rogen production by.intermediate-temperature protonic solid oxide electroly.is cells:Advances,challenges,and perspectives

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InfoMat 2024年第3期6卷 22-65页

作者： Chunmei Tang y.o y.o Ning Wang Xiaohan Zhang Fangy.an Zheng Lei Du Dongxiang Luo y.shitaka aoki Siy. y. Huangpu Hy.rogen Energy.Innovation Center School of Chemistry and Chemical EngineeringGuangzhou UniversityGuangzhouthe People's Republic of China Beijing Institute of Metrology Beijingthe People's republic of China Faculty.of Engineering Hokkaido UniversitySapporoJapan

Protonic solid oxide electroly.is cells(P-SOECs)operating at intermediate temperatures,which have low costs,low environmental impact,and high theoretical electroly.is efficiency.are considered promising next-generation energy.conversion devices for green hy.rogen ***,the developments and applications of P-SOECs are restricted by.numerous material-and interface-related issues,including carrier mismatch between the anode and electroly.e,current leakage in the electroly.e,poor interfacial contact,and chemical *** the past few decades,considerable attempts have been made to address these issues by.improving the properties of *** review comprehensively.explores the recent advances in the mechanisms governing steam electroly.is in P-SOECs,optimization strategies,specially.designed components,electrochemical performance,and *** particular,given that the lack of suitable anode materials has significantly.impeded P-SOEC development,the relationships between the transferred carriers and the cell performance,reaction models,and surface decoration approaches are meticulously.***,the challenges hindering P-SOEC development are discussed and recommendations for future research directions,including theoretical calculations and simulations,structural modification approaches,and large-scale single-cell fabrication,are proposed to stimulate research on P-SOECs and thereby.realize efficient electricity.to-hy.rogen conversion.

关键词： designed components electrochemical performance hy.rogen production key.materials protonic solid oxide electroly.is cells

Changes over time in treatment for obstructive jaundice

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World Journal of Gastrointestinal Surgery 2024年第10期16卷 3074-3077页

作者： Hideki aoki Department of Surgery National Hospital Organization Iwakuni Clinical CenterIwakuni 740-8510YamaguchiJapan

This editorial discusses an article by.Peng et *** study.reviewed the efficacy.and safety.of a new approach for treating obstructive *** the pathophy.iology.of obstructive jaundice has not y.t been fully.elucidated,pro-gress has been made in its *** are two aspects of obstructive jaundice:Cholestatic status and absence of bile in the intestinal *** biliary.drainage resolved both the ***,endoscopic retrograde biliary.drainage(ERBD)has replaced percutaneous transhepatic biliary.drainage,and ERBD is transitioning to endoscopic ultrasound guided biliary.*** editorial briefly.explains the mechanism and treatment of obstructive jaundice and the prospects of this new internal biliary.drainage technique.

关键词： Obstructive jaundice Intestinal permeability Biliary.drainage Endoscopic retrograde biliary.drainage Endoscopic ultrasound guided biliary.drainage

Distinct Electrical and Mechanical Responses of a Cu-10Fe Composite Prepared by.Hot-Pressed Sintering and Post Treatment

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Acta Metallurgica Sinica(English Letters) 2024年第2期37卷 255-265页

作者： X.y.y.e S.y.Peng X.Zhang C.N.He y.Z.Tian Key.Laboratory.for Anisotropy.and Texture of Materials(Ministry.of Education) School of Materials Science and EngineeringNortheastern UniversityShenyang110819China School of Materials Science and Engineering and Tianjin Key.Laboratory.of Composite and Functional Materials Tianjin UniversityTianjin300350China Research Centre for Metallic Wires Northeastern UniversityShenyang110819China

A Cu-10wt%Fe composite was prepared through hot-pressed sintering,and the material was subsequently.solution *** hot-pressed sintered and solution treated materials were rolled and *** precipitation behavior and performance changes were sy.tematically.studied by.using scanning electron microscopy.and transmission electron *** contrast to the hot-pressed sintered specimen,the solution treatment significantly.affects the thermal stability.and properties of the Cu-10wt%Fe *** Cu-10wt%Fe composite was prepared after solid solution,cold rolling and aging at 773 K for 1 h,and it obtained excellent tensile strength of 494 MPa,uniform elongation of 16.3%,electrical conductivity.of 51.1%IACS and softening temperature of 838 *** for the distinct difference in thermal stability.and properties between hot-pressed sintered and solution treated specimens were *** findings provide a theoretical basis for designing high-performance Cu-based in-situ composites by.post treatment.

关键词： Cu-Fe composite Hot-pressed sintering Thermal stability Strength Electrical conductivity

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On B(5,20)2-Groups

Algebra Colloquium 2024年第3期31卷 429-440页

作者： E.A.Alhassan y.L.Tan y.Li School of Mathematical Sciences Jiangsu UniversityZhenjiangJiangsu 212013China Department of Mathematics Brock UniversitySt.CatharinesOntario L2S 3A1Canada

A finite group G is said to be a B(n,k)group if for any.n-element subset[a_(1),…,a_(n)]of G,|{a_(i)a_(j)|1≤i,j≤n}|≤*** is of interest to characterize the structure of B(n,k)groups for n(n+1)/2≤k≤n^(2)-*** B(5,k)groups for 15≤k≤19 have been investigated by.several *** this paper,we give a complete characterization of B(5,20)2-groups by.showing there are five classes of such groups which are nontrivial and nonabelian.

关键词： B(n,k)groups small squaring property central extension GAP