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Observation of magnetic domain evolution in constrained epitaxial Ni–Mn–Ga thin films on MgO(0 0 1) substrate

Journal of Materials Science & Technology 2022年第7期102卷 56-65页

作者： Bo Yang Ivan Soldatov Fenghua Chen Yudong Zhang Zongbin Li Haile Yan rudolf schäfer Dunhui Wang Claude Esling Xiang Zhao Liang Zuo Key Laboratory for Anisotropy and Texture of Materials(Ministry of Education) School of Material Science and EngineeringNortheastern UniversityShenyang 110819China Institute for Metallic Materials Leibniz Institute for Solid State and Materials Research(IFW)DresdenHelmholtzstrasse 2001069 DresdenGermany Institute of Natural Sciences Ural Federal University620002 EkaterinburgRussia Department of Physics School of Applied ScienceTaiyuan University of Science and TechnologyTaiyuan 030024China Laboratoire d’Étude des Microstructures et de Mécanique des Matériaux(LEM3) CNRS UMR 7239Universitéde Lorraine57045 MetzFrance Institute for Materials Science Dresden University of Technology01062 DresdenGermany National Laboratory of Solid State Microstructures and Jiangsu Key Laboratory for Nanotechnology and Collaborative Innovation Center of Advanced Microstructures Nanjing UniversityNanjing 210093China

Epitaxial Ni–Mn–Ga thin films have promising application potential in micro-electro-mechanical sensing and actuation systems. To date, large abrupt magnetization changes have been observed in some epitaxial Ni–Mn–Ga thin films, but their origin-either from magnetically induced martensite variant reorientation(MIR) or magnetic domain evolution-has been discussed controversially. In the present work, we investigated the evolutions of the magnetic domain and microstructure of a typical epitaxial Ni–Mn–Ga thin film through wide-field magneto-optical Kerr-microscopy. It is demonstrated that the abrupt magnetization changes in the hysteresis loops should be attributed to the magnetic domain evolution instead of the MIR.

关键词： Ni–Mn–Ga thin films Magnetic field-induced variant reorientation Magnetic domains Magnetization process Magneto-optical Kerr microscopy

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Self-assembly as a tool to study microscale curvature and strain-dependent magnetic properties

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npj Flexible Electronics 2022年第1期6卷 754-762页

作者： Balram Singh Jorge A.Otálora Tong H.Kang Ivan Soldatov Dmitriy D.Karnaushenko Christian Becker rudolf schäfer Daniil Karnaushenko Volker Neu Oliver G.schmidt Institute for Integrative Nanosciences Leibniz IFW Dresden01069 DresdenGermany Nanophysics Faculty of PhysicsTU Dresden01062 DresdenGermany Departamento de Física Universidad Católica del NorteAvenida Angamos 0610Casilla 1280 AntofagastaChile Institute for Metallic Materials Leibniz IFW Dresden01069 DresdenGermany Center for Materials Architectures and Integration of Nanomembranes(MAIN)Chemnitz University of Technology09126 ChemnitzGermany Institute for Materials Science TU Dresden01062 DresdenGermany Material Systems for Nanoelectronics Chemnitz University of Technology09107 ChemnitzGermany

The extension of 2D ferromagnetic structures into 3D curved geometry enables to tune its magnetic properties such as uniaxial magnetic *** the anisotropy with strain and curvature has become a promising ingredient in modern electronics,such as flexible and stretchable magnetoelectronic devices,impedance-based field sensors,and strain gauges,however,has been limited to extended thin films and to only moderate *** applying a self-assembly rolling technique using a polymeric platform,we provide a template that allows homogeneous and controlled bending of a functional layer adhered to it,irrespective of its shape and *** is an intriguing possibility to tailor the sign and magnitude of the surface strain of integrated,micronsized *** this article,the impact of strain and curvature on the magnetic ground state and anisotropy is quantified for thinfilm Permalloy micro-scale structures,fabricated on the surface of the tubular architectures,using solely electrical measurements.

关键词： alloy magnetic curvature

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On Problems with Downscaling in Internal Flows

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Journal of Thermal Science 2005年第4期14卷 305-307页

作者： rudolf DVO■K Institute of Thermomechanics Academy of Sciences of the Czech RepublicDolejskova 5Prague 18200 Czech Republic

Problems that may accompany downscaling in internal flows are discussed. Non-dimensional similarity parameters （like Re, M, etc.） depend on parameters that scale down fully （e.g., length）, or that are specified by design （velocities, cascade geometry）, or that are scale invariant （like thermophysical and transport properties of fluids）.This fact has to be taken into acount in the similarity considerations. With decreasing Reynolds number the surface forces become of growing importance, however, if not going down directly to microflows the main problems are connected with the three-dimensional flow structure affecting the skin friction, and with the fact that some of the flow phenomena （e.g. vortical structures） cannot fully develop.

关键词： relatively narrow channels secondary flows skin friction microturbines.

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Secondary Flow Effects in Relatively Narrow Channels

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Journal of Thermal Science 2003年第3期12卷 209-213,238页

作者： rudolf Dvo■ák Institute of Thermomechanics Academy of Sciences of the Czech Republic 182 00 Prague The Czech Republic

Secondary flow effects were discussed in numerous papers at the past ISAIF Symposia, mainly in connection with turbine or compressor cascades. This paper will complement these papers by looking at the problem from the channel (or blade passages) geometry point of view. If we describe as secondary flows any flows in planes perpendicular to the main flow direction, then there are at least three kinds of secondary flows in a typical turbine rotor cascade:-secondary flows of the 1st kind, generated by centrifugal forces in closed curved channels,-secondary flows of the 2nd kind, generated by interacting boundary layers, mainly in corners (this will include even the horseshoe vortices),-secondary flows due to mass inflow through the tip clearance.Quite often all the secondary flow vortices merge downstream into a passage vortex with a non-negligible contribution to the channel (cascade) losses, and it is worth investigating the individual contributions to these losses to take them into account in the design procedure.

关键词： channel flows secondary flows flow separation.

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Stability Analysis of Equilibrium Manifolds for a Two-Predators One-Prey Model

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Tsinghua Science and Technology 2006年第6期11卷 739-744页

作者：张鑫唐云 rudolf scherer Department of Mathematical Sciences Tsinghua University Institute of Practical Mathematics University of KarlsruheD-76128 KarlsruheGermany

The objective of this paper is to analyze the stability of equilibrium manifolds for a ratio-dependent two-predators one-prey model. Some model results are presented first with the bifurcation without parameters method, and then the method was used to study bifurcation along the equilibrium manifold for the model The model does not lose stability even when some equilibria are locally unstable because the equilibrium manifold is stable when treated as a whole. The ecological implications of the results are discussed.

关键词： bifurcation equilibrium manifold predator-prey model stability

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How a membrane agent buys goods in a membrane store

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Progress in Natural Science:Materials International 2007年第4期17卷 442-448页

作者： rudolf Freund Marion Oswald Thomas schirk Institute of Computer Languages Vienna University of Technology Favoritenstr. 9 WienAustria

In this paper we consider a specific model of membrane systems, i. e. membrane systems with attributes. In these systems, the information is placed at the membranes in form of attributes, no objects are considered inside the membranes except for other membranes. The membrane system with attributes evolves according to rules that compute new values for the attributes from the attributes assigned to the membranes involved in the rule. The model of membrane systems with attributes allows us to specify business transactions in a precise way and to simulate different models for such transactions with a suitable tool for membrane systems with attributes.

关键词： model membrane systems with attributes.

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Sustained neuronal viability by paracrine factors: new opportunities for endothelial progenitor cell secretome

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Neural Regeneration Research 2021年第7期16卷 1429-1430页

作者： Stefano Di Santo Hans rudolf Widmer Department of Neurosurgery Neurocenter and Regenerative Neuroscience ClusterUniversity Hospital BernSwitzerland University of BernInselspitalSwitzerland

Despite the big progresses in the field of regenerative medicine, the loss of neurons remains essentially an unresolved *** the different approaches under investigation, there are great expectations on stem and progen... 详细信息

关键词： progenitor strategies. spite

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Noninvasive diagnosis of hepatic fibrosis in chronic hepatitis C

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World Journal of Gastroenterology 2007年第32期13卷 4287-4294页

作者： rudolf E Stauber Carolin Lackner Department of Internal Medicine Medical University of GrazGrazAustria Institute of Pathology Medical University of GrazGrazAustria

Assessment of hepatic fibrosis is important for determining prognosis,guiding management decisions,and monitoring disease. Histological evaluation of liver biopsy specimens is currently considered the reference test for staging hepatic fibrosis. Since liver biopsy carries a small but significant risk,noninvasive tests to assess hepatic fibrosis are desirable. This editorial gives an overview on noninvasive methods currently available to determine hepatic fibrosis and their diagnostic accuracy for predicting significant fibrosis and cirrhosis in chronic hepatitis C. Based on available data,the performance of simple tests derived from routine laboratory parameters appears to be similar to that of more complex and expensive fibrosis panels. Transient elastography seems more accurate than blood tests for diagnosing cirrhosis.

关键词： Noninvasive fibrosis tests Significant fibrosis Cirrhosis Biomarkers Transient elastography

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Pneumatic Measurements Downstream of a Radial Turbine Nozzle Cascade

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Journal of Thermal Science 2010年第1期19卷 42-46页

作者： Martin LUXA rudolf DVORAK David SIMURDA Jan VIMMR Department of Fluid Dynamics Institute of Thermomechanicsv.v.i.Academy of Science of the Czech RepublicPragueCzech Republic Department of Mechanics University of West Bohemia in PilsenPlzeňCzech Republic

This paper deals mainly with pneumatic measurements on a radial turbine nozzle cascade. The fill radial cascade guarantees the exit flow field periodicity downstream of it. A special traversing mechanism with a five - hole conical probe moving along a circular path behind the cascade was used for flow field investigation in this type of cascade with very low aspect ratio. The analyses of results of 2D and 3D pneumatic measurements including loss coefficient values are presented.

关键词： radial turbine cascade aspect ratio pneumatic measurement loss coefficient

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IgE-Mast cell mediated allergy: a sensor of food quality

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Signal Transduction and Targeted Therapy 2024年第1期9卷 8-9页

作者： Christopher C.Udoye rudolf A.Manz Institute for Systemic Inflammation Research University of LübeckLübeckGermany

In two recent studies published in Nature,Florsheim et *** Plum et *** that allergic-specific reactions induced by immunoglobulin(Ig)E mediated mast cell activation is crucial for the timely induction of antigen-avoidance behaviour.1,2 These studies prove the concept that allergic sensitization triggers the formation of avoidance behaviour and define the underlying molecular mechanism.

关键词： allergic mechanism

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