bluuebunny/crossref_metadata_2025_split huggingface dataset:
Solitary Roll Vortices in the Mixed Convection of a Vertical Fluid Layer
Authors: Hoffmann Norbert P. , Withalm Martin 
Published: March 2010

AbstractSome earlier experimental and numerical findings from convection in vertical channels suggest that localized convection rolls could play a role in the transition process of free or mixed convection. In the present work solitary convection roll vortices for a vertical fluid layer with stable stratification, differential shear and differentially heated side‐walls have been obtained numerically for a fluid of unit Prandtl number. The solutions appear through saddle‐node bifurcations and in certain parameter ranges they do also exist for linearly stable basic flow. (© 2009 Wiley‐VCH Verlag GmbH & Co. KGaA, Weinheim)
Transient inviscid flow in a passive linear model of the cochlea
Authors: Obrist Dominik 
Published: March 2010

AbstractDetailed knowledge of the fluid dynamics within the cochlea is important for a complete understanding of the physiology of this complex organ. We present a numerical simulation in the time domain for the inviscid two‐dimensional flow in a passive cochlea. Numerical results are presented for a click stimulation and an impulsively started tone. (© 2009 Wiley‐VCH Verlag GmbH & Co. KGaA, Weinheim)
The method of lines for the computation of incompressible viscous flows
Authors: Kosma Z. 
Published: March 2010

AbstractA common approach to finding numerical solutions of the time‐dependent incompressible Navier‐Stokes equations is considered within the method of lines framework [1]. For the determination of viscous incompressible flows the stream‐function formulation for the fourth‐order equation [2, 3], an artificial compressibility method [4], and a modified velocity correction method [5] are designed. Some improved and extended results of numerical simulations obtained by the author in the previous works are presented. Test calculations have been done for various flows inside square, triangular and semicircular cavities with one moving wall, the backward‐facing step, double bent channels and for the flow around an aerofoil at large angle of attack. An alternative and practical methodology for resolving the Navier‐Stokes equations in arbitrarily complex geometries using Cartesian meshes is proposed. Some of complex geometrical configurations can be decomposed into a set of subdomains. The simplest approach for specifying boundary conditions near curved or irregular boundaries is to transfer all the variables from the boundaries to the nearest grid knots. (© 2009 Wiley‐VCH Verlag GmbH & Co. KGaA, Weinheim)
Numerical investigation of laminar fluid flow in an oscillating sphere
Authors: Stein Anika , Rütten Markus , Wünsch Olaf 
Published: March 2010

AbstractThe paper deals with the numerical simulation of three dimensional oscillating fluid flow of filled and partial filled hollow spheres. We use a program based on finite volume method developed by the DLR. Our main interest is on the secondary flow in the middle plane. Results are presented for Newtonian fluids in dependence of different boundary conditions which are compared with analytical and experimental investigations. (© 2009 Wiley‐VCH Verlag GmbH & Co. KGaA, Weinheim)
Hybrid, numerical solutions, for three‐dimensional, compressible Navier‐Stokes layer
Authors: Nastase A. 
Published: March 2010

AbstractThe author proposes new hybrid solutions for the three‐dimensional, compressible Navier‐Stokes layer (NSL) over a flying configuration (FC), which use the analytical potential solutions, of the same FC, two times, namely: to reinforce the numerical solutions by multiplying them with these analytical solutions and as outer flow (instead of the parallel flow, used by Prandtl in his boundary layer theory). These hybrid solutions fulfill the last behavior, have correct jumps along the singular lines (like subsonic leading edges, junction lines wing‐fuselage, etc.), are split, accurate and rapid convergent. (© 2009 Wiley‐VCH Verlag GmbH & Co. KGaA, Weinheim)
On the Sensitiveness of Absorption Coefficient to Changes in Material Parameters
Authors: Langer Sabine , Al‐Kharabsheh Dina , Wulkau Meike 
Published: March 2010

AbstractAn essential property of porous absorbers is the resistance to the incident sound wave, resulting in a damping effect. Damping results from the friction between air molecules and absorber pore‐walls. In practice, the known dependencies of the sound absorption coefficient are used in the design of absorbers. But not every material can be characterized by a one‐parameter model. The reliability of prediction can be improved by using detailed material models. Hence, additional material parameters, especially the pore geometry are needed. Since in practice the effort for determining material parameters must be minimized, this paper discusses the sensitivity of prediction of absorbers' performance depending on the influence of material parameters that are input for the prediction model chosen. (© 2009 Wiley‐VCH Verlag GmbH & Co. KGaA, Weinheim)
Recent progress on contactless inductive flow tomography
Authors: Wondrak Thomas , Stefani Frank , Gundrum Thomas , Gerbeth Gunter 
Published: March 2010

AbstractThe contactless inductive flow tomography (CIFT) is a technique to reconstruct the velocity in electrically conducting melts using magnetic fields. One of its application could be the velocity reconstruction in the mould of the continuous casting process. In this paper, we present the numerical investigation and first measurements of the induced magnetic field taken in our lab on a small model of a continuous casting mould. (© 2009 Wiley‐VCH Verlag GmbH & Co. KGaA, Weinheim)
Optimal wireless sensors' location for monitoring of structures in randomly disturbed environment
Authors: Dunajewski I. , Kotulski Z. 
Published: March 2010

AbstractIn the paper we present the specific conditions that appear in structures' monitoring by means of Wireless Sensor Networks (WSN). First, we introduce the problem of optimal sensors' location for structures monitoring and its specific constraints if one uses WSN. We formulate the conditions that must be taken into account during optimization. Then, we give an example of temperature measurements and formulate the procedure that leads to finding optimal wireless sensors locations. Finally, we present the experimental observations of wireless sensors in the network that strongly affect on the temperature estimation on a basis of the collected measurements. We conclude with remarks concerning WSN practical design for permanent structures' monitoring to obtain exact and reliable results. (© 2009 Wiley‐VCH Verlag GmbH & Co. KGaA, Weinheim)
Application of stochastic point processes in mechanics
Authors: Iwankiewicz Radoslaw 
Published: March 2010

AbstractStochastic point processes are the mathematical tools relevant to all problems where the phenomena have the nature of a random train of events. Applications may be found in structural dynamics where some stochastic excitations may be adequately idealized as random trains of impulses or general pulses. An example of application in mechanics of materials is the stochastic model of the grain growth processes in polycrystalline nanomaterials. Based on the stochastic differential equations formulation, analysis methods such as the moment equations method or the method of equation for the response probability density are dealt with. (© 2009 Wiley‐VCH Verlag GmbH & Co. KGaA, Weinheim)
An introduction to nonlinear problems with random parameters by the Stochastic perturbation‐based FEM
Authors: Kamiński M.M. 
Published: March 2010

AbstractThe main aim of this paper is to present an algorithm and the solution to the nonlinear problems with random parameters. The methodology is based on the generalized nth order stochastic perturbation method and, on the other hand, on the Finite Element Method adjacent to the physical and geometrical nonlinearities. The perturbation approach resulting from the Taylor series expansion with uncertain parameters is proposed in two different ways – thanks to the straightforward differentiation of the initial incremental equation and, separately, using the modified Response Function Method. This approach is illustrated with the analysis of the simply supported elastoplastic beam loaded centrally with the concentrated force, where the probabilistic moments for the limit load and the reliability indices are determined via the stochastic symbolic computations. (© 2009 Wiley‐VCH Verlag GmbH & Co. KGaA, Weinheim)
Optimal Design of Plane Frames under Uncertainty: A Comparison of Two Approaches
Authors: Zier Simone 
Published: March 2010

AbstractUsing the first collapse theorem, the necessary and sufficient survival conditions of an elasto‐plastic structure consist of the yield condition and the equilibrium condition. In practical applications several random model parameters have to be taken into account. This leads to a stochastic optimization problem which cannot be solved using the traditional methods. Instead of that, appropriate (deterministic) substitute problems must be formulated. Here, the design of plane frames is considered, where the applied load is supposed to be stochastic. In the first approach the recourse problem will be formulated in the standard form of stochastic linear programming (SLP). In order to apply efficient numerical solution procedures (LP‐solvers), approximate recourse problems based on discretization (RPD) and the expected value problem (EVP) are introduced. In the second approach – based on the yield condition – a quadratic cost function will be introduced. After the formulation of the stochastic optimization problem, the expected cost based optimization problem (ECBOP) and the minimum expected cost problem (MECP) are formulated as representatives of appropriate substitute problems. Subsequently, comparative numerical results using these methods are presented. (© 2009 Wiley‐VCH Verlag GmbH & Co. KGaA, Weinheim)
Adaptive solution of elliptic PDE‐eigenvalue problems.
Authors: Mehrmann Volker , Międlar Agnieszka 
Published: March 2010

AbstractIn this paper we introduce a new adaptive algorithm (AFEMLA) for elliptic PDE‐eigenvalue problems. In contrast to other approaches the algebraic eigenvalue problem does not have to be solved to full accuracy. We incorporate the iterative solution of the resulting finite dimensional algebraic eigenvalue problems in the adaptation process in order to balance the cost with the costs for the iterative eigenvalue method. We present error estimates that incorporate the discretization errors, approximation errors in the eigenvalue solver and roundoff errors. (© 2009 Wiley‐VCH Verlag GmbH & Co. KGaA, Weinheim)
On Optimal Control Using Particle Methods
Authors: Marburger Jan 
Published: March 2010

AbstractMesh‐based methods like finite elements and finite volumes enjoy limited use in deforming domain and free surface applications due to exorbitant computational demands. Instead, particle methods are very suitable for simulating such problems. However, they have not been used for optimisation yet. We therefore derive optimisation strategies using this kind of methods. (© 2009 Wiley‐VCH Verlag GmbH & Co. KGaA, Weinheim)
Model Predictive Control for Nonlinear Parabolic Differential Equations Based on a Linear Quadratic Gaussian Design
Authors: Benner Peter , Hein Sabine 
Published: March 2010

AbstractWe consider optimal control problems for semilinear parabolic partial differential equations where process and measurement noise can occur. If we apply a Model Predictive Control (MPC) scheme we obtain optimal control problems on small time intervals. The resulting “smaller problems” can be linearized around a reference and solved by using a Linear Quadratic Gaussian (LQG) design. We present some theoretical background of the strategy above as well as results of a numerical implementation for a 3D problem. (© 2009 Wiley‐VCH Verlag GmbH & Co. KGaA, Weinheim)
Modelling of working machines seat suspension with an air‐spring and hydraulic shock‐absorber
Authors: Maciejewski Igor 
Published: March 2010

AbstractFor the purpose of this paper, an exemplary seat suspension system is modelled and simulated numerically. The system consists of a shear guidance mechanism of a suspended seat, an air‐spring, a hydraulic shock‐absorber and end‐stop buffers. As results of computer simulations, the power spectral densities of acceleration and the transmissibility functions of seat suspension are evaluated with respect to results measured experimentally. The verification of simulation model is performed in the basis of Seat Effective Amplitude Transmissibility factor (SEAT) and the maximum relative displacement of suspension system. (© 2009 Wiley‐VCH Verlag GmbH & Co. KGaA, Weinheim)
Optimisation of pneumatic circuit aimed at improving the vibro‐isolation properties of seat suspension
Authors: Maciejewski Igor , Kiczkowiak Tomasz , Krzyzynski Tomasz 
Published: March 2010

AbstractThe object of a numerical simulation and optimisation is the seat with a visco‐elastic passive suspension, with improved vibro‐isolation properties by means the multi‐criteria optimisation. Basing on the verified passive seat suspension model, a modification of the pneumatic circuit in order to help the working machines operators against vibration is considered. The root mean square (RMS) acceleration measured at the seat and the maximum relative displacement of the seat suspension are minimised as the chosen vibro‐isolation criteria. (© 2009 Wiley‐VCH Verlag GmbH & Co. KGaA, Weinheim)
Effects of molecular water models on Molecular Dynamic simulation of nanoflows
Authors: Bytnar J. , Kucaba‐Piętal A. , Walenta Z. 
Published: March 2010

AbstractWe study an influence of the effect of water molecular models and thermostats on approaching equilibrium in Molecular Dynamics simulation of the nanoflows of water. Out of large number of existing models of water we present the results for four selected ones, i.e.: TIP4P, PPC, TIP4P‐2005, TIP5P, and for two thermostats ‐ Gaussian and Nosé‐Hoover. (© 2009 Wiley‐VCH Verlag GmbH & Co. KGaA, Weinheim)
Definitizability of a Class of J‐Selfadjoint Operators with Applications
Authors: Behrndt Jussi , Philipp Friedrich , Trunk Carsten 
Published: March 2010

AbstractWe formulate an abstract result concerning the definitizability of J‐selfadjoint operators which, roughly speaking, differ by at most finitely many dimensions from the orthogonal sum of a J‐selfadjoint operator with finitely many negative squares and a semibounded selfadjoint operator in a Hilbert space. The general perturbation result is applied to a class of singular Sturm–Liouville operators with indefinite weight functions. (© 2009 Wiley‐VCH Verlag GmbH & Co. KGaA, Weinheim)
Singular Indefinite Sturm‐Liouville Operators with a Spectral Gap
Authors: Behrndt Jussi , Möws Roland , Trunk Carsten 
Published: March 2010

AbstractSingular Sturm‐Liouville operators with the indefinite weight sgn(·) and a symmetric potential which has a positive limit at ∞ have a gap in the essential spectrum. Under an additional condition it is shown that in this gap are no eigenvalues. (© 2009 Wiley‐VCH Verlag GmbH & Co. KGaA, Weinheim)
Applying the Zigbee technology for the enhancing the remote objects control
Authors: Wojnarowski Józef , Borowik Bohdan 
Published: March 2010

AbstractThe paper presents the monitoring and measurement processes for the remote object vibration in the plain space. Wireless, RF communication in Tx/Rx duplex mode provides transfer of data with ZigBee transceivers. Presented ZigBee technology operates in many various modes on frequency 2.4 GHz allowing the coordinator node to select certain path and data. ZigBee technology can be alternative for other vibration research techniques. The vibration displacement is processed further by DSP Digital Signal Processing, made with the microcontroller. Accelerometer applications due to embedded control and I/O digital signal processor DSP play the crucial role in determining vibration and machines fatigue strength testing. It registers, among other, the temporary industrial parameters and monitors plant system parameters such as vibration and/or pressure. The paper presents diagnostic procedure and measurements process of the vibration in the plain space. Role of the node play ZigBee transceivers. (© 2009 Wiley‐VCH Verlag GmbH & Co. KGaA, Weinheim)
Simulation of a Hybrid‐Forming Process using Temperature‐ and Rate‐Dependent Viscoplastic Material Models
Authors: Sauerland Kim‐Henning , Schneidt Andreas , Mahnken Rolf 
Published: March 2010

AbstractHybrid‐forming processes for graded structures are quite innovative methods for the production of components with tailored properties, particularly tailored material properties and geometrical shape. In this contribution a hybrid‐forming process based on the utilization of locally varying thermo‐mechanical effects is investigated [1]. For process optimization and improvement of the resulting work piece the simulation of the entire forming process is necessary in modern engineering. The main topics of this contribution are the simulation of the cyclic thermal loaded forming tool and the simulation of the work piece treated at large deformations with phase transformations. For both materials temperature‐ and rate‐dependent viscoplastic material models are applied and parameter identification using cyclic tensile‐compression tests for the forming tool material and phase transformation tests for a low‐alloy steel similar to the work piece material is presented. For validation of finite‐element‐calculations for the forming tool thermal shock experiments are performed with optical deformation measurements. For validation of finite‐element‐calculations for the work piece numerical results of geometry and structure after heating, forming and cooling are compared to experimental micro sections. Results concerning the forming tool will be used for future lifetime prediction and results concerning the work piece will be used for future specific setting of graded material properties. (© 2009 Wiley‐VCH Verlag GmbH & Co. KGaA, Weinheim)
Stability and free vibrations of discrete frame subjected to the generalised load by the force directed towards the positive pole
Authors: Podgórska‐Brzdękiewicz Iwona 
Published: March 2010

AbstractThe work refers to stability and free vibrations of discrete, two‐part planar frame with three degree of freedom. For the considered frame the total mechanical energy is determined on the basis of the external load of the structure, whose direction of action depends on geometry of loading and receiving head. Adequate relationships describing stability of the considered frame are obtained taking into account potential energy of the system (static criterion) or total mechanical energy (kinetic criterion). An influence of geometrical parameters of loading head and rigidity of rotational springs modelling the finite stiffness of structural constraints on the critical load is analyzed. The courses of natural vibration frequencies in relation to the external loads are determined for the assumed values regarding geometry and physical constants of the system. (© 2009 Wiley‐VCH Verlag GmbH & Co. KGaA, Weinheim)
Concanavalin A‐immobilized magnetic nanoparticles for selective enrichment of glycoproteins and application to glycoproteomics in hepatocelluar carcinoma cell line
Authors: Tang Jia , Liu Yang , Yin Peng , Yao Guoping , Yan Guoquan , Deng Chunhui , Zhang Xiangmin 
Published: March 2010

AbstractProtein glycosylation is one of the most important PTMs in biological organism. Lectins such as concanavalin A (Con A) have been widely applied to N‐glycosylated protein investigation. In this study, we developed Con A‐immobilized magnetic nanoparticles for selective separation of glycoproteins. At first, a facile immobilization of Con A on aminophenylboronic acid‐functionalized magnetic nanoparticles was performed by forming boronic acid‐sugar‐Con A bond in sandwich structure using methyl α‐D‐mannopyranoside as an intermedium. The selective capture ability of Con A‐modified magnetic nanoparticles for glycoproteins was tested using standard glycoproteins and cell lysate of human hepatocelluar carcinoma cell line 7703. In total 184 glycosylated sites were detected within 172 different glycopeptides corresponding to 101 glycoproteins. Also, the regeneration of the protein‐immobilized nanoparticles can easily be performed taking advantage of the reversible binding mechanism between boronic acid and sugar chain. The experiment results demonstrated that Con A‐modified magnetic nanoparticles by the facile and low‐cost synthesis provided a convenient and efficient enrichment approach for glycoproteins, and are promising candidates for large‐scale glycoproteomic research in complicated biological samples.
Proteomic analysis of the Echinococcus granulosus metacestode during infection of its intermediate host
Authors: Monteiro Karina M. , de Carvalho Marcos O. , Zaha Arnaldo , Ferreira Henrique B. 
Published: March 2010

AbstractCystic hydatid disease (CHD) is caused by infection with the Echinococcus granulosus metacestode and affects both humans and livestock. In this work, we performed a proteomic analysis of the E. granulosus metacestode during infection of its intermediate bovine host. Parasite proteins were identified in different metacestode components (94 from protoscolex, 25 from germinal layer and 20 from hydatid cyst fluid), along with host proteins (58) that permeate into the hydatid cyst, providing new insights into host‐parasite interplay. E. granulosus and platyhelminth EST data allowed successful identification of proteins potentially involved in downregulation of host defenses, highlighting possible evasion mechanisms adopted by the parasite to establish infection. Several intracellular proteins were found in hydatid cyst fluid, revealing a set of newly identified proteins that were previously thought to be inaccessible for inducing or modulating the host immune response. Host proteins identified in association with the hydatid cyst suggest that the parasite may bind/adsorb host molecules with nutritional and/or immune evasion purposes, masking surface antigens or inhibiting important effector molecules of host immunity, such as complement components and calgranulin. Overall, our results provide valuable information on parasite survival strategies in the adverse host environment and on the molecular mechanisms underpinning CHD immunopathology.
Proteomic analysis of the response of an acidophilic strain of Chlamydomonas sp. (Chlorophyta) to natural metal‐rich water
Authors: Cid Cristina , Garcia‐Descalzo Laura , Casado‐Lafuente Victor , Amils Ricardo , Aguilera Angeles 
Published: March 2010

AbstractA proteomic approach including 2‐DE and MALDI‐TOF analysis has been developed to identify the soluble proteins of the unicellular photosynthetic algae Chlamydomonas sp. isolated from an extreme acidic environment, Río Tinto (southwest Spain). We have analyzed the soluble proteome obtained from whole cells growing on metal‐rich natural acidic water from the river in comparison with the same strain growing in artificial BG‐11 media. The most drastic effect was the decrease in the abundance of the ribulose‐1,5‐biphosphate carboxylase as well as other enzymes related to photosynthesis. However, phytochrome B, phosphoribulokinase, and phosphoglycerate kinase were upregulated when cells were grown in metal‐rich acidic water. Besides, increased accumulation of two Hsps, Hsp70 and Hsp90 as well as other stress‐related enzymes were also found in the cells growing in natural acidic water. These results suggest that naturally occurring metal‐rich water induces a stress response in acidophilic Chlamydomonas forcing algal cells to reorganize their metabolic pathways as an adaptive response to these environmental conditions.