检索结果-南通市图书馆

Development of a low-cost measurement system for cutting edge profile detection

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

Chinese Optics Letters 2011年第7期9卷 33-36页

作者： Gregor Gerstorfer Bernhard G.Zagar Institute for Measurement Technology Johannes Kepler University

The use of a compact disk （CD） pickup head as a displacement measurement system is described. The components contained in a pickup head are explained and how they are combined to obtain the functionality of a pickup head. The application of measuring a knife edge profile is introduced. The results reveal some insuffiencies with the current system. The cutting edge＇s radius of curvature can be estimated.

关键词： Development of a low-cost measurement system for cutting edge profile detection VCM

Novel insights into D-Pinitol based therapies:a link between tau hyperphosphorylation and insulin resistance

在线全文

学校读者我要写书评

暂无评论

Neural Regeneration Research 2024年第2期19卷 289-295页

作者： Dina Medina-Vera Antonio Jesús López-Gambero Juan Antonio Navarro Carlos Sanjuan Elena Baixeras Juan Decara Fernando Rodríguez de Fonseca Instituto de Investigación Biomédica de Málaga y Plataforma en Nanomedicina-IBIMA Plataforma BIONAND UGC Salud MentalMálagaSpain Facultad de Ciencias Universidad de MálagaMálagaSpain CIBER Enfermedades Cardiovasculares(CIBERCV) Hospital Universitario Virgen de la VictoriaUGC del CorazónMálagaSpain university of Bordeaux INSERMNeurocentre MagendieBordeauxFrance Euronutra S.L.Calle johannes kepler MálagaSpain Departamento de Bioquímica y Biología Molecular Facultad de MedicinaUniversidad de MálagaMálagaSpain

Alzheimer’s disease is a neurodegenerative disorder characterized by the amyloid accumulation in the brains of patients with Alzheimer’s *** pathogenesis of Alzheimer’s disease is mainly mediated by the phosphorylation and aggregation of tau *** the multiple causes of tau hyperphosphorylation,brain insulin resistance has generated much attention,and inositols as insulin sensitizers,are currently considered candidates for drug *** present narrative review revises the interactions between these three elements:Alzheimer’s disease-tau-inositols,which can eventually identify targets for new disease modifiers capable of bringing hope to the millions of people affected by this devastating disease.

关键词： Alzheimer’s disease cyclin-dependent kinase 5 diabetes D-Pinitol inositols insulin resistance kinases phosphorylation PI3K/Akt tau

3D mixed finite elements for curved,flat piezoelectric structures

在线全文

学校读者我要写书评

暂无评论

International Journal of Smart and Nano Materials 2019年第4期10卷 249-267页

作者： Martin Meindlhumer Astrid Pechstein Institute of Technical Mechanics Johannes Kepler University LinzLinzAustria

The Tangential-Displacement Normal-Normal-Stress(TDNNS)method is a finite element method that was originally introduced for elastic solids and later extended to piezoelectric *** uses tangential components of the displacement and normal components of the normal stress vector as degrees of freedom for *** the electric field,the electric potential is *** TDNNS method has been shown to provide elements which do not suffer from shear *** thin structures(*** patch actuators)can be modeled *** and prismatic elements of arbitrary polynomial order are provided in the current *** show that these elements can be used to discretize curved,shelllike geometries by curved elements of high aspect *** order of geometry approximation can be chosen independently from the polynomial order of the shape *** present two examples of curved geometries,a circular patch actuator and a radially polarized piezoelectric *** results of the TDNNS method are compared to results gained in *** obtain good results for displacements and electric potential as well as for stresses,strains and electric field when using only one element in thickness direction.

关键词： Piezoelasticity mixed finite elements curved elements locking free

Orderly Algorithm to Enumerate Central Groupoids and Their Graphs

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

Acta Mathematica Sinica,English Series 2007年第2期23卷 249-264页

作者： Tim BOYKETT Time’s Up Research Department and Department of Mathematics Johannes-Kepler University

A graph has the unique path property UPPif there is a unique path of length n betweenany ordered pair of *** paper reiterates Royle and MacKay’s technique for constructing orderly *** wishto use this technique to enumerate all UPPgraphs of small orders 3~2 and 4~*** attempt to use thedirect graph formalism and find that the algorithm is *** introduce a generalised problem and derive algebraic and combinatoric structures with appro-priate *** we are able to design an orderly algorithm to determine all UPPgraphs oforder 3~2,which runs fast *** hope to be able to determine the UPPgraphs of order 4~2 in thenear future.

关键词： orderly algorithms paths in directed graphs enumeration

General Solutions of First-Order Algebraic ODEs in Simple Constant Extensions

在线全文

同方期刊数据库

学校读者我要写书评

暂无评论

系统科学与复杂性学报:英文版 2023年第4期36卷 1769-1788页

作者： MITTERAMSKOGLER Johann Josef WINKLER Franz Research Institute for Symbolic Computation(RISC) Johannes Kepler Universität LinzA-4040 LinzAustria

If a first-order algebraic ODE is defined over a certain differential field,then the most elementary solution class,in which one can hope to find a general solution,is given by the adjunction of a single arbitrary constant to this *** of this type give rise to a particular kind of generic point—a rational parametrization—of an algebraic curve which is associated in a natural way to the ODE’s defining *** for the opposite direction,we show that a suitable rational parametrization of the associated curve can be extended to a general solution of the ODE if and only if one can find a certain automorphism of the solution *** automorphisms are determined by linear rational functions,i.e.,Möbius *** properties of rational parametrizations,in combination with the particular shape of such automorphisms,lead to a number of necessary conditions on the existence of general solutions in this solution ***,the desired linear rational function can be determined by solving a comparatively simple differential system over the ODE’s field of *** results hold for arbitrary differential fields of characteristic zero.

关键词： Algebraic curve algebraic differential equation general solution Möbius transformation rational parametrization

Influence of rolling friction on single spout fluidized bed simulation

在线全文

学校读者我要写书评

暂无评论

Particuology 2012年第5期10卷 582-591页

作者： Christoph Goniva Christoph Kloss Niels G. Deen johannes A.M.Kuipers Stefan Pirker Christian-Doppler Laboratory on Particulate Flow Modelling Johannes Kepler UniversityLinz Austria DCS Computing GmbH Linz Austria Christian-Doppler Laboratory on Particulate Flow Modelling Johannes Kepler UniversityLinz Austria Department of Chemical Engineering and Chemistry Eindhoven University of TechnologyEindhovenThe Netherlands Department of Chemical Engineering and Chemistry Eindhoven University of TechnologyEindhovenThe Netherlands Christian-Doppler Laboratory on Particulate Flow Modelling Johannes Kepler UniversityLinzAustria Institute of Fluid Mechanics and Heat Transfer Johannes Kepler UniversityLinzAustria

In this paper we study the effect of rolling friction on the dynamics in a single spout fluidized bed using Discrete Element Method （DEM） coupled to Computational Fluid Dynamics （CFD）. In a first step we neglect rolling friction and show that the results delivered by the open source CFD-DEM framework applied in this study agree with previous simulations documented in literature. In a second step we include a rolling friction sub-model in order to investigate the effect of particle non-sphericity. The influence of particle-particle as well as particle-wall rolling friction on the flow in single spout fluidized bed is studied separately. Adequate rolling friction model parameters are obtained using first principle DEM simulations and data from literature. Finally, we demonstrate the importance of correct modelling of rolling friction for coupled CFD-DEM simulations of spout fluidized beds. We show that simulation results can be improved significantly when applying a rolling friction model, and that experimental data from literature obtained with Positron Emission Particle Trackin~ fPEPT） technique can be satisfactorily reoroduced.

关键词： CFD-DEMOpen sourceRolling frictionSpout fluidized bedNon-sphericity

Simulation of spray coating in a spouted bed using recurrence CFD

在线全文

学校读者我要写书评

暂无评论

Particuology 2019年第1期17卷 92-103页

作者： Paul Kieckhefena Thomas Lichtenegger Swantje Pietsch Stefan Pirker Stefan Heinrich Institute of Solids Process Engineering and Particle Technology Hamburg University of Technology. HamburgGermany Department for Particulate Flow Modelling. johannes kepler university LinzAustria Linz Institute of Technology (LIT) Johannes Kepler UniversityLinzAustria

Although numerical models such as the computational fluid dynamics–discrete element method (CFD–DEM) have enabled the accurate simulation of laboratory-scale apparatuses, the application of these methods to large-scale apparatuses with many particles and time scales ranging from minutes to hours remains a challenge. The recently developed recurrence CFD (rCFD) method seeks to overcome these issues in pseudo-periodic processes by extrapolating globally recurring patterns in a physically meaningful way and describing the transport and interaction of passive scalars using Lagrangian tracers. Spouted beds represent an interesting target because of the associated variety of flow regimes. They can be effectively described by CFD–DEM on the time scale of tens of seconds, whereas industrially relevant processes typically take hours. In this contribution, we established the validity of applying the Lagrangian rCFD method to spouted beds by demonstrating the accurate reproduction of the particle residence time distribution in a fictitious spray zone. The deposition of spray droplets onto tracer particles was simulated for 1 h, and the particle surface coverage distribution was estimated using a statistical approach for both an unstabilized prismatic spouted bed and one stabilized by draft plates.

关键词： CFD–DEM Recurrence CFD Spray coating Time-scale decoupling Spouted bed Draft plate

An Optimised Surface Structure for Passive, Unidirectional Fluid Transport Bioinspired by True Bugs

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

Journal of Bionic Engineering 2021年第2期18卷 375-386页

作者： Sebastian Lifka Florian Hischen johannes Heitz Werner Baumgartner Institute of Biomedical Mechatronics Johannes Kepler University LinzAltenberger Straße 694040 LinzAustria Institute of Applied Physics Johannes Kepler University LinzAltenberger Straße 694040 LinzAustria

Some true bug species use droplet-shaped,open-capillary structures for passive,unidirectional fluid transport on their body surface in order to spread a defensive fluid to protect themselves against *** this paper we investigated if the shape of the structures found on bugs(bug-structure)could be optimised with regard to better performance in unidirectional fluid ***,to use this kind of surface structure in technical applications where fluid surface interaction occurs,it is necessary to adapt the structure geometry to the contact angle between fluid and *** on the principal of operation of the droplet-shaped structures,we optimised the structure shape for better performance in targeted fluid flow and increase in flexibility in design of the structure *** adapt the structure geometry and the structure spacing to the contact angle,we implemented an equilibrium simulation of the,the structure surrounding,*** order to verify the functionality of the optimised structure,we designed and manufactured a *** testing this prototype with pure water used as fluid,the functionality of the optimised structure and the simulation could be *** kind of structure may be used on technical surfaces where targeted fluid transport is needed,*** of condensate in order to prevent the surface from mold growth,microfluidics,lab-on-a-chip applications and on microneedles for efficient drug/vaccine coating.

关键词： biomimetics true bugs liquid-surface interaction passive unidirectional fluid transport microfluidics lab-on-a-chip

Discussion of sources of error in laser-speckle based systems

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

Chinese Optics Letters 2011年第7期9卷 41-44页

作者： Bernhard G.Zogar Institute for Measurement Technology Johannes Kepler University Altenbergerstraβe 69 4040 Linz Austria

Applying laser-speckle techniques in material sciences as well as in methods to characterize surface con- ditions of specimen has become the method of choice, especially if a non-contacting principle is sought. This is almost always the case for specimen that are small in at least one dimension as for example in the materiM testing of foils, fibres, or micromaterials and certainly also if elevated test-temperatures are preventing standard gauges. This letter discusses in some detail sources of error that are quite often over- looked or not even considered as significant at all, but still carry the potential to introduce uncertainties well above the system design specifications.

关键词： Discussion of sources of error in laser-speckle based systems