bluuebunny/crossref_metadata_2025_split huggingface dataset:
Towards higher‐order XFEM for interfacial flows
Authors: Fries Thomas‐Peter 
Published: October 2015

AbstractThe simulation of immiscible two‐phase flows is a challenging task, in particular with higher‐order accuracy. We use an interface capturing approach combined with the extended finite element method (XFEM) to represent inner‐element jumps and kinks across the interface. The position of the interface is defined by the curved zero‐level set of a higher‐order scalar function. Here, we focus on the higher‐order accurate integration on the two sides of the interface (i.e., the zero‐level set). (© 2015 Wiley‐VCH Verlag GmbH & Co. KGaA, Weinheim)
Numerical investigation of a liquid displacing a gas in thin porous layers
Authors: Neumann Tim , Boettcher Konrad , Ehrhard Peter 
Published: October 2015

AbstractThis article deals with a liquid displacing a gas in a thin heterogeneous porous material, which occurs e.g. during the filling process of a lithium‐ion battery with an electrolyte. The investigation is based upon the local volume‐averaged Navier‐Stokes equations, using a Volume‐of‐Fluid method to treat the interface. For the flow the wall effect and capillary forces have to be considered. Capillary rise experiments are used to determine the permeability. Since the layers are thin and the characteristic size of the particles is comparatively large, friction with the electrode is taken into account with respect to the mobility of the contact line. The implemented models are validated against analytical results, showing a good agreement. (© 2015 Wiley‐VCH Verlag GmbH & Co. KGaA, Weinheim)
Interaction of a finite‐size particle with the moving lid of a cavity
Authors: Romanò Francesco , Kuhlmann Hendrik C. 
Published: October 2015

AbstractThe motion of a solid particle in a lid‐driven cavity is investigated. If the tangential velocity of the lid is large the streamlines are dense near the moving lid and the finite size of a particle can have a profound effect on its trajectory. To assess this effect different particle‐motion models are examined: inertial point particles (Maxey–Riley equation) one‐way coupled to the flow and finite‐size particles the flow around which is fully resolved (two‐way coupling). We compare the corresponding trajectories with those obtained using the particle–surface interaction model originally introduced by Hofmann and Kuhlmann [Phys. Fluids 23, 0721106 (2011)]. The finite‐size effect on the particle's trajectory is quantified and discussed. (© 2015 Wiley‐VCH Verlag GmbH & Co. KGaA, Weinheim)
Plasticity as the Γ‐limit of a Nonlinear Dislocation Energy with Mixed Growth
Authors: Ginster Janusz 
Published: October 2015

AbstractWe consider a model for straight parallel edge dislocations with a nonlinear elastic energy with mixed growth. By means of Γ‐convergence we show that the suitably rescaled energy converges to a strain‐gradient plasticity model. As a tool we proof a generalized rigidity estimate which bounds the distance of a field with non‐vanishing curl to a specific rotation by the distance to all rotations. (© 2015 Wiley‐VCH Verlag GmbH & Co. KGaA, Weinheim)
A Phase‐field Model of Dislocations on Parallel Slip Planes
Authors: Gladbach Peter 
Published: October 2015

AbstractWe establish a line‐tension energy for dislocation networks concentrated in finitely many parallel slip planes as the limit of a Peierls‐Nabarro energy. Dislocations in different planes interact depending on their distance. At intermediate distances a two‐scale dislocation microstructure is optimal. (© 2015 Wiley‐VCH Verlag GmbH & Co. KGaA, Weinheim)
Multi‐criteria optimisation of the vibro‐isolation properties
Authors: Krzyznski Tomasz , Maciejewski Igor 
Published: October 2015

AbstractThe paper deals with a methodology of shaping the vibro‐isolation properties of suspensions applied in automotive systems. The developed optimisation procedure allows to find the Pareto‐optimal system configuration for the conflicted vibro‐isolating criteria. The correctness of proposed methodology is evaluated using the semi active and active systems with optimal controller settings. (© 2015 Wiley‐VCH Verlag GmbH & Co. KGaA, Weinheim)
Backward error of polynomial eigenvalue problems solved by linearization
Authors: Lawrence Piers , Van Barel Marc , Van Dooren Paul 
Published: October 2015

AbstractIt is commonplace in many application domains to utilize polynomial eigenvalue problems to model the behaviour of physical systems. Many techniques exist to compute solutions of these polynomial eigenvalue problems. One of the most frequently used techniques is linearization, in which the polynomial eigenvalue problem is turned into an equivalent linear eigenvalue problem with the same eigenvalues, and with easily recoverable eigenvectors. The eigenvalues and eigenvectors of the linearization are usually computed using a backward stable solver such as the QZ algorithm. Such backward stable algorithms ensure that the computed eigenvalues and eigenvectors of the linearization are exactly those of a nearby linear pencil, where the perturbations are bounded in terms of the machine precision and the norms of the matrices defining the linearization. Although we have solved a nearby linear eigenvalue problem, we are not certain that our computed solution is in fact the exact solution of a nearby polynomial eigenvalue problem. Here, we perform a backward error analysis for the solution of a specific linearization for polynomials expressed in the monomial basis. We use a suitable one‐sided factorization of the linearization that allows us to map generic perturbations of the linearization onto structured perturbations of the polynomial coefficients. (© 2015 Wiley‐VCH Verlag GmbH & Co. KGaA, Weinheim)
Parallel Bidiagonal SVD via the Method of Multiple Relatively Robust Representations
Authors: Winkelmann Jan , Bientinesi Paolo 
Published: October 2015

AbstractA bidiagonal SVD solver based on the Method of Multiple Relatively Robust Representations (MR3) promises to be an improvement over the current state of the art by providing lower asymptotic runtime and the ability to calculate a subset of singular triplets at reduced cost. Currently, no MR3 based SVD solver is readily available. Using results by Willems and Lang [2], we provide an initial implementation of such a solver and compare it to LAPACK's Divide and Conquer solver. (© 2015 Wiley‐VCH Verlag GmbH & Co. KGaA, Weinheim)
Optimal control for lithium‐ion batteries
Authors: Vossen Georg , Struck Alexander , Roos Dirk 
Published: October 2015

AbstractModelling, simulation and optimal control for a lithium‐ion battery cell is discussed. The model involves ionic concentrations, currents and potentials in the electrodes and the separator together with the battery temperature as state variables. The resulting system is a nonlinear PDAE system with 10 partial, 1 ordinary differential and 4 algebraic equations involving the Butler‐Volmer kinetics for describing the interaction of ionic currents and potentials. Time‐optimal charging of the battery subject to age‐preventing leads to a state‐constrained optimal control problem which is solved in two ways. A first‐discretize‐then‐optimize approach leads to a high‐dimensional nonlinear optimization problem which is solved by an efficient solver. As an alternative, a feedback control law along an active arc of the state constraint of order 1 is derived to formulate and solve the corresponding so‐called induced optimization problem. (© 2015 Wiley‐VCH Verlag GmbH & Co. KGaA, Weinheim)
Automated generation of a dynamic feedforward control law using local model networks with disturbance inputs
Authors: Euler‐Rolle Nikolaus , Hametner Christoph , Jakubek Stefan 
Published: October 2015

AbstractAn effective approach is presented, which automatically generates a dynamic feedforward control law for nonlinear dynamic systems represented by a discrete‐time local model network (LMN) as one class of data‐driven models. In this context, feedback linearization is applied to the generic model structure of LMN and the resulting input transformation is used as model inverse. Thus, by representing a nonlinear dynamic system by an LMN and applying the proposed feedforward control law generation, a dynamic feedforward control for such a nonlinear system can be found automatically with the knowledge of measured input/output data only. In addition, several disturbance inputs are considered in the feedforward control law without restrictions on their relative degree. However, only multiple input LMN where no internal dynamics are involved, i.e. the LMN has full relative degree with respect to the control signal input, are considered in this manuscript. (© 2015 Wiley‐VCH Verlag GmbH & Co. KGaA, Weinheim)
Control design of the vibration reduction systems
Authors: Maciejewski Igor , Krzyzynski Tomasz 
Published: October 2015

AbstractThe paper deals with an original control algorithm for semi‐active and active suspension that are often used in automotive systems. The developed procedure assists in finding the structure of control system, which consists of the primary controller and calculates the desired active force. Then the desired force has to be approximately achieved by the semi‐active or active element with calculated input signal using the inverse model. (© 2015 Wiley‐VCH Verlag GmbH & Co. KGaA, Weinheim)
Controllability characterization of switched DAEs
Authors: Küsters Ferdinand , Trenn Stephan 
Published: October 2015

AbstractWe study controllability of switched differential algebraic equations (switched DAEs) with fixed switching signal. Based on a behavioral definition of controllability we are able to establish a controllability characterization that takes into account possible jumps and impulses induced by the switches. (© 2015 Wiley‐VCH Verlag GmbH & Co. KGaA, Weinheim)
A robust estimation method for camera calibration with known rotation
Authors: Egozi Amir , Maass Peter , Sagiv Chen 
Published: October 2015

AbstractImagine that hundreds of video streams, taken by mobile phones during a rock concert, are uploaded to a server. One attractive application of such prominent dataset is to allow a user to create his own video with a deliberately chosen but virtual camera trajectory. This is the challenge addressed by the Scenenet project, programme FET‐Open SME (GA 309169). One of the most basic tasks related to creating such a video, is the spatial registration of the individual video stream prior to combining them into a new virtual video. At its core, this requires to estimate the pairwise relative geometry of images taken by different cameras. This is known as the relative pose problem [1], and is fundamental to many computer vision algorithms. In practice, efficiency and robustness is of highest relevance for big data applications as the ones address in the EU‐FET_SME project Scenenet. In this paper, we present an improved algorithm that exploits additional data from inertial sensors, such as accelerometer, magnetometer or gyroscopes, which by now are available in most mobile phones. We demonstrate that in this case the pose estimation problem reduces to a 3‐dimensional least‐squares optimization problem, which can be readily implemented into a 3‐points RANSAC scheme. Experimental results on synthetic and real data demonstrate the accuracy and efficiency of our algorithm. (© 2015 Wiley‐VCH Verlag GmbH & Co. KGaA, Weinheim)
Nonnegative Matrix Factorization based on the Geometry of Positive Numbers
Authors: Jeuris Ben , Iannazzo Bruno , Pompili Filippo 
Published: October 2015

AbstractWe consider the problem of nonnegative matrix factorization where the typical objective function is altered based on geometrical arguments. A noneuclidean geometry on positive real numbers is used to describe the nonnegative entries of a nonnegative matrix, influencing the factorization model. We design an optimization procedure from a differential geometric point of view for the newly proposed model. (© 2015 Wiley‐VCH Verlag GmbH & Co. KGaA, Weinheim)
EWE: Toward electro‐mechanical cardiac simulations with MOOSE
Authors: Ruprecht Daniel , Winkel Mathias , Krause Rolf 
Published: October 2015

AbstractWe present the software framework EWE, which is designed for coupled electromechanical simulations in computational cardiology. EWE is build on the multi‐physics framework MOOSE. Numerical simulations of coupled problems on an idealized geometry for a left ventricle are shown. (© 2015 Wiley‐VCH Verlag GmbH & Co. KGaA, Weinheim)
Does Boris‐SDC conserve phase space volume?
Authors: Winkel Mathias , Speck Robert , Ruprecht Daniel 
Published: October 2015

AbstractIn this paper we investigate the conservation of phase space volume of the Boris‐SDC algorithm. This method provides a generic way to extend the standard, second‐order accurate Lorentz force integrator commonly used for charged particles in an electric and magnetic field to a high‐order method using spectral deferred corrections. For a single particle in a Penning trap and different frequencies of the electric and magnetic fields, we assess the conservation properties of the method by computing the update matrix of one step of Boris‐SDC as well as its determinant. We compare the results to the convergence regions and relate them to energy conservation properties of the method. (© 2015 Wiley‐VCH Verlag GmbH & Co. KGaA, Weinheim)
Sensitivities Calculation for Unsteady Flow Problems
Authors: Stoia‐Djeska Marius , Frunzulica Florin 
Published: October 2015

AbstractIn this work we present an efficient approach for the calculation of the sensitivities in the case of unsteady problems like the compressible high‐speed flows. The sensitivities are of a known response with respect to the initial conditions. If the number of parameters is large, the adjoint method is preferred since the cost of computing the sensitivities is independent of the number of design parameters. (© 2015 Wiley‐VCH Verlag GmbH & Co. KGaA, Weinheim)
Constancy of spectra of equivariant (non‐selfadjoint) operators over minimal dynamical systems
Authors: Seifert Christian 
Published: October 2015

AbstractWe show that for a large class of equivariant continuous, possibly non‐selfadjoint, operators over minimal dynamical systems the spectrum as a set is in fact independent of the random parameter. Furthermore, the spectrum agrees with the essential spectrum. (© 2015 Wiley‐VCH Verlag GmbH & Co. KGaA, Weinheim)
Domenico Fontana and the entrance of mechanics in architecture
Authors: Masiani R. , Tocci C. 
Published: October 2015

AbstractThe analysis of archival documents related to the static restoration of the abacus of Marcus Aurelius Column and the reading of the description of the operations performed to move the Vatican Obelisk allow illustrating the mastery that Domenico Fontana exhibits about the statics of elementary machines – deriving from the knowledge of the technical literature of the second half of the sixteenth century – and his ability to exploit it as a support in the phase of structural invention. (© 2015 Wiley‐VCH Verlag GmbH & Co. KGaA, Weinheim)
Nineteenth century molecular models with a glance at modern discrete—continuum theories
Authors: Trovalusci Patrizia 
Published: October 2015

AbstractThe origins of multiscale modelling, lying in the classical molecular models of Nineteenth century originally formulated to provide explanations per causas of elasticity, are investigated with the aim of drawing suggestions for the modelling of new complex materials. Conceptual guidelines for deriving scale dependent continuum formulations, here continuum models with additional degrees of freedom (multifield continua), are defined starting from non‐classical corpuscular descriptions and the historical and epistemological settings of the current modelling proposals are highlighted. (© 2015 Wiley‐VCH Verlag GmbH & Co. KGaA, Weinheim)
On numerical schemes for phase‐field models for electrowetting with electrolyte solutions
Authors: Metzger Stefan 
Published: October 2015

AbstractWe present an energy‐stable, decoupled discrete scheme for a recent model (see [1]) supposed to describe electrokinetic phenomena in two‐phase flow with general mass densities. This model couples momentum and Cahn–Hilliard type phase‐field equations with Nernst–Planck equations for ion density evolution and an elliptic transmission problem for the electrostatic potential.The transport velocities in our scheme are based on the old velocity field updated via a discrete time integration of the force densities. This allows to split the equations into three blocks which can be treated sequentially: The phase‐field equation, the equations for ion transport and electrostatic potential, and the Navier–Stokes type equations. By establishing a discrete counterpart of the continuous energy estimate, we are able to prove the stability of the scheme. (© 2015 Wiley‐VCH Verlag GmbH & Co. KGaA, Weinheim)
Current controversies in prenatal diagnosis 1: should NIPT routinely include microdeletions/microduplications?
Authors: Rose Nancy C. , Benn Peter , Milunsky Aubrey 
Published: October 2015

What's already known about this topic?

Technology is available to add microdeletion testing to cell free DNA screening.
What does this study adds?

This report summarizes an oral debate presented at the 19th International Conference on Prenatal Diagnosis and Therapy in Washington, DC, USA, on 14 July 2015.
Through the debate, the benefits, limitations, and challenges of potential wide‐scale implementation of microdeletion testing with prenatal samples was reviewed and discussed.
Psychometric properties of the Fear of Cancer Recurrence Inventory: an item response theory approach
Authors: Costa Daniel S. J. , Dieng Mbathio , Cust Anne E. , Butow Phyllis N. , Kasparian Nadine A. 
Published: October 2015

AbstractObjectiveClassical psychometric methods have been used to demonstrate the validity and reliability of the 42‐item Fear of Cancer Recurrence Inventory (FCRI). Our aim was to expand on this evidence with information on the discriminative value of the individual items when administered to people with a personal history of melanoma, using an item response theory (IRT) approach.MethodsWe used a two‐parameter IRT model to examine all items of the FCRI, primarily regarding whether people with a personal history of melanoma use the response scale as expected (as indicated by item characteristic curves), and whether the items can discriminate between those low and high on the constructs assessed by the instrument.ResultsThe sample was comprised of 286 adults with a personal history of melanoma (58% male, mean age: 59.1 years). The established factor structure of the FCRI was generally confirmed. IRT highlighted several items with problematic item characteristic curves, including most items in the Reassurance and Coping Strategies domains. Several other items exhibited poor discrimination.ConclusionsBased on this IRT analysis, we outline suggestions for refinement of the FCRI and potential development of a short‐form, that could reduce respondent burden. Generalisability of these findings beyond melanoma warrants further examination. Copyright © 2015 John Wiley & Sons, Ltd.
Analysis of free modeling predictions by RBO aleph in CASP11
Authors: Mabrouk Mahmoud , Werner Tim , Schneider Michael , Putz Ines , Brock Oliver 
Published: October 2015

ABSTRACTThe CASP experiment is a biannual benchmark for assessing protein structure prediction methods. In CASP11, RBO Aleph ranked as one of the top‐performing automated servers in the free modeling category. This category consists of targets for which structural templates are not easily retrievable. We analyze the performance of RBO Aleph and show that its success in CASP was a result of its ab initio structure prediction protocol. A detailed analysis of this protocol demonstrates that two components unique to our method greatly contributed to prediction quality: residue–residue contact prediction by EPC‐map and contact‐guided conformational space search by model‐based search (MBS). Interestingly, our analysis also points to a possible fundamental problem in evaluating the performance of protein structure prediction methods: Improvements in components of the method do not necessarily lead to improvements of the entire method. This points to the fact that these components interact in ways that are poorly understood. This problem, if indeed true, represents a significant obstacle to community‐wide progress. Proteins 2016; 84(Suppl 1):87–104. © 2015 Wiley Periodicals, Inc.
Toward decrypting the allosteric mechanism of the ryanodine receptor based on coarse‐grained structural and dynamic modeling
Authors: Zheng Wenjun 
Published: October 2015

ABSTRACTThe ryanodine receptors (RyRs) are a family of calcium (Ca) channels that regulate Ca release by undergoing a closed‐to‐open gating transition in response to action potential or Ca binding. The allosteric mechanism of RyRs gating, which is activated/regulated by ligand/protein binding >200 Å away from the channel gate, remains elusive for the lack of high‐resolution structures. Recent solution of the closed‐form structures of the RyR1 isoform by cryo‐electron microscopy has paved the way for detailed structure‐driven studies of RyRs functions. Toward elucidating the allosteric mechanism of RyRs gating, we performed coarse‐grained modeling based on the newly solved closed‐form structures of RyR1. Our normal mode analysis captured a key mode of collective motions dominating the observed structural variations in RyR1, which features large outward and downward movements of the peripheral domains with the channel remaining closed, and involves hotspot residues that overlap well with key functional sites and disease mutations. In particular, we found a key interaction between a peripheral domain and the Ca‐binding EF hand domain, which may allow for direct coupling of Ca binding to the collective motions as captured by the above mode. This key mode was robustly reproduced by the normal mode analysis of the other two closed‐form structures of RyR1 solved independently. To elucidate the closed‐to‐open conformational changes in RyR1 with amino‐acid level of details, we flexibly fitted the closed‐form structures of RyR1 into a 10‐Å cryo‐electron microscopy map of the open state. We observed extensive structural changes involving the peripheral domains and the central domains, resulting in the channel pore opening. In sum, our findings have offered unprecedented structural and dynamic insights to the allosteric mechanism of RyR1 via modulation of the key collective motions involved in RyR1 gating. The predicted hotspot residues and open‐form conformation of RyR1 will guide future mutational and functional studies. Proteins 2015; 83:2307–2318. © 2015 Wiley Periodicals, Inc.
Formation of plasmonic nanoparticle arrays –rules and recipes for an ordered growth
Authors: Fleischer Karsten , Ualibek Oral , Verre Ruggero , Shvets Igor V. 
Published: October 2015

AbstractWe review a self‐assembled growth method for plasmonic nanoparticle arrays, based on glancing angle deposition. We produced ordered Ag, Au, and Cu nanoparticle arrays over large areas on different stepped oxide templates. Precise control over the final geometry can be difficult and we provide recipes to obtain macroscopically ordered structures. We discuss the influence of the adsorbate diffusion length and facet termination on the shape and size distributions of metallic nanoparticle arrays and show that an increased ad‐atom mobility leads to more regular arrays of spherical nanoparticles. We also show how in‐situ Reflectance Anisotropy Spectroscopy (RAS) can be used to extract indirect information on the nucleation and ripening the nanoparticles, as well as measure the plasmonic resonance.Schematics of the RAS setup used to in‐situ monitor the growth of plasmonic nanoparticle arrays on stepped oxide templates.