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彩色多普勒超声的现实地位和价值

放射学实践 1991年第4期6卷 148-155页

作者： P.Heidt f.fobbe K.-J.Wolf 乐桂蓉 freie Universit t Berlin Klinikum SteglitzKlinik für RadiologieNuklearmedizin und physikalische TherapieAbteilung für R ntgendiagnostik 同济医科大学附属同济医院

近年来由于仪器技术的不断改进,在日常非损伤性诊断中,彩色多普勒超声检查(fKDS)的临床意义越来越大.fKDS与普通B型超声图象的区别在于,不是通过整个基质扫查,而是通过频移来表达的,而其彩色成象点较灰阶图象逊色.这表明在软组织结构的... 详细信息

近年来由于仪器技术的不断改进,在日常非损伤性诊断中,彩色多普勒超声检查(fKDS)的临床意义越来越大.fKDS与普通B型超声图象的区别在于,不是通过整个基质扫查,而是通过频移来表达的,而其彩色成象点较灰阶图象逊色.这表明在软组织结构的实时灰阶B型图象上。

关键词：彩色多普勒超声非损伤性诊断现实地位价值

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胰腺胃吻合术:惠普尔手术的变更

放射学实践 1988年第4期 158-160页

作者： Von f.fobbe 窦永充 Klinik fur Radiologie Nuklearmedizin und Physikalische Therapie 同济医科大学附属同济医院

部分十二指肠胰腺吻合术,将胰头植入胃中是惠普尔手术的一种变更。其操作简单、瘘管少见。胰腺残端植入处和胃溃疡在放射形态学上没有什么区别,然而知道这种手术的过程可避免误诊。

关键词：吻合术手术惠普尔十二指肠小肠胰腺慢性复发性胰腺炎慢性胰腺炎胰腺残端

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Spieghel-疝的超声和x线显象

放射学实践 1989年第3期4卷 121-124页

作者： D.felsenberg Chr.Koch f.fobbe T.Rmer 乐桂蓉 Klinik für Radiologie Nuklearmedizin und Physikalische Therapie Abteilung für Rontgendiagnostik 同济医科大学附属同济医院

应用超声检查可诊断Spieghel-疝,至目前为止发生腹裂孔疝者约500例。凡不明原因的中、下腹不适者应疑及本病可能。

关键词： Spieghel-疝超声诊断 X线显象

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Crohn氏病横结肠巨大假性息肉

放射学实践 1986年第3期 104-105页

作者： Von W.Gowin ,f.fobbe ,窦永充同济医科大学附属同济医院

直径大于1.5cm的假性息肉即认为是巨大假性息肉.结肠的息肉样改变如此之大是少见的,它主要作为溃疡性结肠炎的并发症出现,约占病例的5%.Crohn氏病伴巨大假性息肉也很少见,英、美文献约有10例报道,目前尚未见有关的德文资料.

关键词：息肉基底部并发症粘膜瘤样病变并发病疾病生物膜 Crohn 息肉样

Control and vibration analyses of a sandwich doubly curved micro-composite shell with honeycomb,truss,and corrugated cores based on the fourth-order shear deformation theory

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Applied Mathematics and Mechanics(English Edition) 2024年第10期45卷 1773-1790页

作者： f.SHIRDELAN M.MOHAMMADIMEHR f.BARGOZINI Department of Solid Mechanics Faculty of Mechanical EngineeringUniversity of KashanKashan 87317-53153Iran

Curved shells are increasingly utilized in applied engineering due to their shared characteristics with other sandwich structures,flexibility,and attractive ***,the inability of controlling and regulating vibrations and destroying them afterward is a challenge to *** this paper,the curve shell equations and a linear quadratic regulator are adopted for the state feedback design to manage the structure vibrations in state space forms.A five-layer sandwich doubly curved micro-composite shell,comprising two piezoelectric layers for the sensor and actuator,is modeled by the fourth-order shear deformation *** core(honeycomb,truss,and corrugated)is analyzed for the bearing of transverse shear *** results show that the honeycomb core has a greater effect on the *** the parameters related to the core and the weight percentage of graphene increase,the frequency *** uniform distribution of graphene platelets results in the lowest natural frequency while the natural frequency ***,without taking into account the piezoelectric layers,the third-order shear deformation theory(TSDT)and fourth-order shear deformation theory(fOSDT)align ***,when the piezoelectric layers are incorporated,these two theories diverge significantly,with the frequencies in the fOSDT being lower than those in the TSDT.

关键词： vibration and control doubly curved shell micro-composite honeycomb truss corrugate core

Bolstering integrity in environmental data science and machine learning requires understanding socioecological inequity

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frontiers of Environmental Science & Engineering 2024年第5期18卷 171-179页

作者： Joe f.Bozeman III School of Civil and Environmental Engineering Georgia Institute of TechnologyAtlantaGA30332USA School of Public Policy Georgia Institute of TechnologyAtlantaGA30332USA

Socioecological inequity in environmental data science—such as inequities deriving from data-driven approaches and machine learning(ML)—are current issues subject to debate and *** is growing consensus around embedding equity throughout all research and design domains—from inception to administration,while also addressing procedural,distributive,and recognitional ***,practically doing so may seem onerous or daunting to *** current perspective helps to alleviate these types of concerns by providing substantiation for the connection between environmental data science and socioecological inequity,using the Systemic Equity framework,and provides the foundation for a paradigmatic shift toward normalizing the use of equity-centered approaches in environmental data science and ML *** the integrity of environmental data science and ML is just beginning from an equity-centered tool development and rigorous application *** this end,this perspective also provides relevant future directions and challenges by overviewing some meaningful tools and strategies—such as applying the Wells-Du Bois Protocol,employing fairness metrics,and systematically addressing irreproducibility;emerging needs and proposals—such as addressing data-proxy bias and supporting convergence research;and establishes a ten-step path ***,the work that environmental scientists and engineers do ultimately affect the well-being of us all.

关键词： Equity Bias Machine Learning Data Science Justice Systemic Equity

Premature axon-oligodendrocyte interaction contributes to stalling of experimental axon regeneration after injury to the white matter

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Neural Regeneration Research 2024年第3期19卷 469-470页

作者： Ephraim f.Trakhtenberg Department of Neuroscience University of Connecticut School of MedicineFarmingtonCTUSA

Studies from nearly 3 decades ago suggested that,in the central nervous system(CNS),myelination of axons by oligodendrocytes not only helps improve axonal conductivity but also stabilizes circuitry(Colello and Schwab,1994).Over the years,myelin sheaths produced by oligodendrocytes have been found to contain multiple molecules that are inhibitory to axonal growth(e.g.,MAG,NogoA,OMgp,Semaphorins)(Yiu and He,2006;Silver et al.,2014).After white matter injury in the adult CNS,myelin debris from damaged axons and dead oligodendrocytes accumulates in the forming glial scar and exposes these myelin-associated axon growth-inhibitory molecules to the injured axonal stumps,thereby contributing to the inhibition of axonal *** development,CNS axons reach their postsynaptic targets and stop growing before oligodendrocytes appear and myelinate them(foran and Peterson,1992;Dangata et al.,1996).Therefore,myelin-associated axon growth-inhibitory molecules interacting with already grown axons during myelination were thought to block axons from promiscuous sprouting and miswiring,thereby stabilizing neural circuitry in the CNS(Colello and Schwab,1994).

关键词： thereby white injury

An unexpected cellular fountain of youth:platelets provide factors rejuvenating brain functions

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Signal Transduction and Targeted Therapy 2024年第1期9卷 16-18页

作者： Harald f.Langer Department of Cardiology AngiologyHaemostaseology and Medical Intensive CareUniversity Medical Centre MannheimMedical Faculty MannheimHeidelberg UniversityMannheimGermany German Centre for Cardiovascular Research(DZHK) Partner Site Heidelberg/MannheimMannheimGermany European Center for Angioscience Medical Faculty MannheimHeidelberg UniversityMannheimGermany Cardiovascular systems biology Medical Clinic IUniversity Heart Center LübeckLübeckGermany

In a recent manuscript published in Nature,Schroer et *** that platelets and in particular platelet derived Pf-4(CXCL4)are a novel factor,which can rejuvenate the mammalian neuronal system.1 These findings have the potential to trigger an entire new field of research opening new platelet-derived candidate effector molecules for supporting regeneration.

关键词： supporting platelets finding

The viscous strip approach to simplify the calculation of the surface acoustic wave generated streaming

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Applied Mathematics and Mechanics(English Edition) 2024年第4期45卷 711-724页

作者： f.JAZINI DORCHEH M.GHASSEMI fuel Cells and Nano Systems(fCNS)Laboratory Department of Mechanical EngineeringK.N.Toosi University of TechnologyTehran 19697Iran

In recent decades,the importance of surface acoustic waves,as a biocompatible tool to integrate with microfluidics,has been proven in various medical and biological *** numerical modeling of acoustic streaming caused by surface acoustic waves in microchannels requires the effect of viscosity to be considered in the equations which complicates the *** this paper,it is shown that the major contribution of viscosity and the horizontal component of actuation is concentrated in a narrow region alongside the actuation *** the inviscid equations are considerably easier to solve,a division into the viscous and inviscid domains would alleviate the computational load *** particles'traces calculated by this approximation are excellently alongside their counterparts from the completely viscous *** is also shown that the optimum thickness for the viscous strip is about 9-fold the acoustic boundary layer thickness for various flow patterns and amplitudes of actuation.

关键词： surface acoustic wave microfluidics numerical simulation particle tracing acoustic streaming