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Clustering of voltage-gated ion channels as an evolutionary trigger of myelin formation

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Neural Regeneration Research 2024年第8期19卷 1631-1632页

作者： Henrike Ohm Simone Rey Christian Klambt institut fur Neuro-und Verhaltensbiologie MunsterGermany

Neurons carry apical dendrites that perceive information and a basal axon that transmits the computed information towards its to *** axon originates at the axon hillock which is followed by the axon initial ***,action potentials are initiated that are based on millisecond long openings of specific voltagegated sodium and potassium channels that are conserved in all parahoxozoa(Placozoa,Cnidaria,Bilateria)(Li et al.,2015).

关键词： initiated carry potassium

A glance at three-dimensional Alexandrov spaces

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Frontiers of Mathematics in China 2016年第5期11卷 1189-1206页

作者： Fernando GALAZ-GARCIA institut fur Algebra und Geometrie Karlsruher Institut fiir Technologie (KIT) Karlsruhe Germany

We discuss the topology and geometry of closed Alexandrov spaces of dimension three.

关键词： Alexandrov space group action 3-manifold

Normal and abnormal grain growth in magnesium:Experimental observations and simulations

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Journal of Materials Science & Technology 2020年第15期47卷 257-270页

作者： Risheng Pei Sandra Korte-Kerzel Talal Al-Samman institut fur Metallkunde und Materialphysik RWTH Aachen UniversityD-52056AachenGermany

Commercial purity as-cast magnesium was hot rolled and subsequently annealed at different temperatures in order to investigate its grain growth behavior and link it to the texture *** at an intermediate temperature of 220℃ gave rise to abnormal grain growth with a few grains reaching a grain diameter 10 times larger than the *** the annealing temperature to 350℃ yielded normal grain *** types of grain growth revealed a strengthening of the(0001) texture *** is hypothesized that a dislocation density gradient after recrystallization grants(0001) grains a size advantage during early stages of *** type of growth will be,however,determined by the mobility of the present grain boundaries and triple junction drag,which are strongly dependent on the annealing *** above hypothesis of the interplay between these parameters was explored through curvature-and re sidual dislocation-density-gradient-driven grain growth simulations using a formerly developed level-set *** simulation outcome suggests that application of such a modeling approach in microstructure studies of magnesium can provide valuable new insights into the problem of grain growth and associated texture evolutio n.

关键词： Pure magnesium Grain growth Texture Dislocation density gradient Level-set modeling

Spaces and moduli spaces of Riemannian metrics

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Frontiers of Mathematics in China 2016年第5期11卷 1335-1343页

作者： Wilderich TUSCHMANN Karlsruher institut fur Technologie (KIT) Fakultat fur Mathematik Institut fiir Algebra und Geometrie Arbeitsgruppe Differentialgeometrie Englerstraβe 2 D-76131 Karlsruhe Germany

These notes present and survey results about spaces and moduli spaces of complete Riemannian metrics with curvature bounds on open and closed manifolds, here focussing mainly on connectedness and disconnectedness prop... 详细信息

关键词： Riemannian metrics moduli spaces sectional curvature positive Ricci curvature positive scalar curvature

A Coupled Variable Coefficient Modified KdV Equation Arising from a Two-Layer Fluid System

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Communications in Theoretical Physics 2007年第12期48卷 961-970页

作者： GAO Yuan~1 and TANG Xiao-Yan~(1,2)~1 Department of Physics,Shanghai Jiao Tong University,Shanghai 200240,China~2 institut Für Theoretische Physik IV,Fakultt für Physik und Astronomie,Ruhr-Universitt Bochum,D-44870 Bochum,Germany Department of Physics Shanghai Jiao Tong University institut fur Theoretische Physik IV Fakultat fur Physik und Astronomie Ruhr-Universitat Bochum

A quite general coupled variable coefficient modified KdV (VCmKdV) equation in a two-layer fluid systemis derived by means of the reductive perturbation *** use of the CK's direct method,some similarityreductions of the coupled VCmKdV equation are obtained and their corresponding group explanations are *** exact solutions of the coupled equations are also presented.

关键词： coupled variable coefficient mKdV equation two-layer fluid similarity solution periodic waves

Prediction of Pseudoelastic Elongation in Cu-Zn-AlShape Memory Alloy

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Rare Metals 1995年第2期14卷 131-136页

作者：王超群北京有色金属研究总院北京 institut fur Metallkunde und Metallphysik 德国

The pseudoelastic elongation (P.E.) of β-phase in Cu-Zn-Al SMA (shape memory alloy) was estimated by using the orientation dependence of transformation strain (Taylor model) and texture analysis. It was found that the pseudoelastic elongation is closely related to f(g) of the (001) 〈110〉 texture component in the CuZnAl SMA sheet. The stronger the (001) 〈110〉 texture, the higher value of pseudoelastic elongation is. For the wires, the estimated pseudoelastic elongation decreases with increasing reduction.

关键词： Copper alloys Ductility Forecasting Shape memory effect Tensile properties

Positive curvature, symmetry, and topology

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Frontiers of Mathematics in China 2016年第5期11卷 1099-1122页

作者： Manuel AMANN Fakultat fur Mathematik Institut fiir Algebra und Geometrie Karlsruher Institut fiir Technologie Englerstraβe 2 76131 Karlsruhe Germany

We depict recent developments in the field of positive sectional curvature, mainly, but not exclusively, under the assumption of isometric torus actions. After an elaborate introduction to the field, we shall discuss various classification results, before we provide results on the computation of Euler characteristics. This will be the starting point for an examination of more involved invariants and further techniques. In particular, we shall discuss the Hopf conjectures, related decomposition results like the Wilhelm conjecture, results in differential topology and index theory as well as in rational homotopy theory, geometrically formal metrics in positive curvature and much more. The results we present will be discussed for arbitrary dimensions, but also specified to small dimensions. This survey article features mainly depictions of our own work interest in this area and cites results obtained in different collaborations; full statements and proofs can be found in the respective original research articles.

关键词： Positive sectional curvature torus actions Euler characteristic Hopf conjecture index theory Wilhelm conjecture geometric formality

Modeling of Long-Range Intra- and Inter-Species Charged Particle Collisions for PIC Simulations

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Communications in Computational Physics 2010年第5期7卷 877-903页

作者： D.D’Andrea C.-D.Munz R.Schneider Forschungszentrum Karlsruhe-in der Helmholtz-Gemeinschaft Institut fur Kern-und EnergietechnikPF 3640D-76021 KarlsruheGermany institut fur Aerodynamik und Gasdynamik Universitat StuttgartPfaffenwaldring 21D-70550 StuttgartGermany Forschungszentrum Karlsruhe-in der Helmholtz-Gemeinschaft Institut fur Hochleistungsimpuls und MikrowellentechnikPF 3640D-76021 KarlsruheGermany

In this paper we present the modelling of elastic intra-species electron-electron and inter-species electron-ion scattering in a plasma on the basis of the FokkerPlanck collision *** into account the equivalence of this operator with a stochastic differential equation,we propose a Particle-in-Cell based approach for the numerical solution of the Fokker-Planck collision *** we will see,the introduced numerical concept allows the simulation of the collisional relaxation process in a fully self-consistent fashion.

关键词： Coulomb collisions in plasmas collisional relaxation Fokker-Planck equation stochastic differential equation particle-in-cell method

Solid-state emissive biphenylene bridged bisaroyl-S,N-ketene acetals as distinct aggregation-induced enhanced emitters and fluorometric probes

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Aggregate 2021年第5期2卷 179-184页

作者： Lukas Biesen Thomas J.J.Muller institut fur Organische und Makromolekulare Chemie Heinrich-Heine-Universitat DusseldorfDüsseldorfGermany

Biphenylene bridged bisaroyl-S,N-ketene acetals can be readily synthesized by a one-pot Masuda borylation-Suzuki arylation sequence,thus,yielding a library of 20 bisaroyl-S,N-ketene acetals with tunable solid-state emission and aggregationinduced enhanced emission characteristics depending on the para substituents in the starting *** applications as fluorometric probe of alcoholic beverages are outlined.

关键词： aggregation-induced emission aroyl-S N-ketene acetals liquor sensors one-pot reaction solid-state