bluuebunny/crossref_metadata_2025_split huggingface dataset:
Two Kinds of Monoclinic‐I Martensite and some Insight into the Microstructures they Form
Authors: Chenchiah Isaac , Schlömerkemper Anja 
Published: December 2012

AbstractBy analysing the facet structure of the convex polytope generated by the twelve transformation strains of cubic to monoclinic‐I martensite, we show that there are two different kinds of monoclinic‐I martensite. These two kinds differ in the sign of a material parameter. While the symmetry properties of both kinds are the same, the geometrical structure of the set of recoverable strains is different. A key idea is to consider the convex polytope formed by the transformation strains and to study its facets. Another insight is to use invariant theory to exploit the fact that compatible cones are algebraic surfaces. (© 2012 Wiley‐VCH Verlag GmbH & Co. KGaA, Weinheim)
On a reduced mixed s‐v least‐squares finite element formulation for the incompressible Navier‐Stokes equations
Authors: Schwarz Alexander , Schröder Jörg 
Published: December 2012

AbstractIn the present work a mixed finite element based on a least‐squares approach (LSFEM) is proposed. We consider a formulation for Newtonian fluid flow, which is described by the incompressible Navier‐Stokes equations. The starting point is a div‐grad three‐field first‐order system with stresses, velocities, and pressure as unknowns. Following the idea in CAI et al. [1], this three‐field formulation can be transformed into a reduced stress‐velocity (s‐v) two‐field formulation, which is the basis for the associated minimization problem. In order to show the applicability of the considered approach a numerical example is presented at the end of the paper. (© 2012 Wiley‐VCH Verlag GmbH & Co. KGaA, Weinheim)
Experimental investigation of the electrokinetic flow in microchannels with internal electrodes
Authors: Gizewski Carsten , Ehrhard Peter 
Published: December 2012

AbstractWe investigate the electrokinetic flow in microchannels with internal electrodes. Experiments and numerical simulations are performed. The micro–particle–image velocimetry method is used to measure two–dimesional, two–component velocity fields over the complete height of the microchannel. Based on this measurements, the third velocity component, which cannot be measured directly, is calculated by an integration of the continuity equation. Due to the fact that microparticles, used for the μPIV are electrically non‐neutral leads to the problem that these particles experience electrophoretic forces. That means that the particle movement appears to be a superposition of electroosmotic and electrophorectic effects. To verify the influence of electrophoretic effects on the microparticles, additional numerical calculations are made. (© 2012 Wiley‐VCH Verlag GmbH & Co. KGaA, Weinheim)
Investigation of structure and non‐gradient turbulent transfer in swirling flows
Authors: Čantrak Đorde , Gabi Martin , Janković Novica , Čantrak Svetislav 
Published: December 2012

AbstractTurbulence structure of swirling flows is being investigated in this paper, on the basis of experimental, self conducted measurements, and theoretical and numerical results. Turbulent swirling flows are extremely inhomogeneous, three dimensional and anisotropic. The aim of this paper is to investigate significant influence of swirl onto statistical parameters and non‐gradient turbulent transfer. Contemporary optical measuring techniques two component laser Doppler anemometry (LDA) and stereo particle image velocimetry (SPIV) have been applied. (© 2012 Wiley‐VCH Verlag GmbH & Co. KGaA, Weinheim)
Parametrization of the homogeneous ice nucleation rate for the numerical simulation of multiphase flow
Authors: Nemec Tomás , Eisenschmidt Kathrin , Rauschenberger Philipp , Weigand Bernhard 
Published: December 2012

AbstractHomogeneous ice nucleation in supercooled water is studied with the classical nucleation theory (CNT). The nucleated ice particles are assumed to possess physical properties of metastable cubic ice. The comparison with literature data on homogeneous ice nucleation rates shows a good agreement between CNT predictions and experimental nucleation rates. The CNT predicted nucleation rate, critical cluster radius, and critical nucleation work are parametrized for use in numerical simulations of the freezing process of supercooled water droplets. (© 2012 Wiley‐VCH Verlag GmbH & Co. KGaA, Weinheim)
Phase‐Averaged Vortex Train Flow Generated by Plasma DBD Actuator
Authors: Procházka Pavel , Uruba Václav 
Published: December 2012

AbstractIt will be shown how plasma actuator can generate wall‐jet‐like flow or train of periodical vortices depending on the generator setting. For generation the high‐frequency high‐voltage AC is used. Low‐frequency modulation of the supply voltage is required to generate vortices. Data acquisition will be performed using time‐resolved PIV technique. Phase‐averaging will be studied from two different perspectives. Firstly, sampling of phases will be ensured using trigger that is contained in the PIV software and, secondly, phase‐averaged flow will be computed from two main modes of POD analysis. The generated flow patterns are to be applied for control of a boundary layer. (© 2012 Wiley‐VCH Verlag GmbH & Co. KGaA, Weinheim)
On the modeling of slender heat sources
Authors: Cibis Thomas Martin , Marheineke Nicole , Wegener Raimund 
Published: December 2012

AbstractStudying the heat exchange of small, slender objects in a surrounding flow, we approximate the impact of extended heat sources by Dirac‐distributions (point sources) with appropriate amplitudes in the context of slender‐body theory. The proposed model for the source strength functions is deduced from analytical considerations (Green's functions) of the stationary two‐dimensional heat equation. Numerical simulations show the L2‐approximation quality of the strategy. (© 2012 Wiley‐VCH Verlag GmbH & Co. KGaA, Weinheim)
Delamination in visco‐elastic materials with thermal effects
Authors: Thomas Marita , Rossi Riccarda 
Published: December 2012

AbstractThis contribution reports on a model describing the evolution of brittle delamination between two visco‐elastic bodies Ω+ and Ω−, bonded along a prescribed contact surface ΓC, over a fixed time interval (0, T); a detailed discussion and a rigorous mathematical analysis can be found in [1]. (© 2012 Wiley‐VCH Verlag GmbH & Co. KGaA, Weinheim)
Analytical model for deformable roll coating with nip feed
Authors: Willinger Bettina , Epple Philipp , Delgado Antonio 
Published: December 2012

AbstractThe presented work deals with an analytical solution for a roll coater with deformable rolls, as commenly used in industry. The focus is on the calculation of the nip feed system in a forward coating mode. The calculation is done with thin film theory and includes Hook's law for elasticity for modelling the elasticity behaviour of the deformable roll. The new model has been validated by experimental data from literature. The agreement is sufficiently good. (© 2012 Wiley‐VCH Verlag GmbH & Co. KGaA, Weinheim)
A Smooth 3D Model for Fiber Lay‐Down Processes
Authors: Maringer Johannes , Klar Axel , Stilgenbauer Patrik , Wegener Raimund 
Published: December 2012

AbstractWe present an improved three‐dimensional stochastic model concerning the fiber lay‐down in the production process of nonwoven materials. The model describes the position of the deposited fibers on a conveyor belt, which is determined by a system of stochastic differential equations. Here we remove a drawback of a previous 3D model, that is the non‐smoothness of the fiber paths. Besides the derivation of the smooth 3D model we show its connection to the non‐smooth model in a white noise limit. (© 2012 Wiley‐VCH Verlag GmbH & Co. KGaA, Weinheim)
Avoiding complex arithmetic in the low‐rank ADI method efficiently
Authors: Benner Peter , Kürschner Patrick , Saak Jens 
Published: December 2012

AbstractWe present a new reformulation of the low‐rank ADI method for solving large‐scale Lyapunov equations which uses only real arithmetic operation and storage in the presence of complex shift parameters. This makes the method applicable on computing environments where complex computations and storage are not supported or not efficiently available. For generalized Lyapunov equations it is significantly more efficient than the older completely real formulation of the low‐rank ADI as confirmed by numerical examples. (© 2012 Wiley‐VCH Verlag GmbH & Co. KGaA, Weinheim)
Data Based Regularization Matrices for the Tikhonov‐Phillips Regularization
Authors: Huckle Thomas , Sedlacek Matous 
Published: December 2012

AbstractIn Tikhonov‐Phillips regularization of general form the given ill‐posed linear system is replaced by a Least Squares problem including a minimization of the solution vector x, relative to a seminorm $||L_X||_2$ with some regularization matrix L. Based on the finite difference matrix Lk, given by a discretization of the first or second derivative, we introduce the seminorm $||L_k D_{\bar{x}}^{-1} x||_2$ where the diagonal matrix $D_{\bar{x}} := {\rm diag}\, (|\tilde{x}_1|,\ldots,|\tilde{x}_n|)$ and $\tilde{x}$ is the best available approximate solution to x. (© 2012 Wiley‐VCH Verlag GmbH & Co. KGaA, Weinheim)
Efficient numerical methods for initial‐value solid‐state laser problems
Authors: Feng Fan , Pflaum Christoph 
Published: December 2012

AbstractThe difficulties of solving initial‐value solid‐state laser problems numerically arise from both stiffness of the problems and near‐to‐zero nonnegative exact solutions. Stability and non‐negativity must be maintained simultaneously in the numerical solutions. Backward differentiation formulas (BDFs) is capable of dealing with stiff problems ,but is of small oscillation when time‐step is large. Therefore unfortunately BDFs suffers from severe time‐step restriction . In this paper,we present an optimized numerical approach, with which 3‐dimensional laser problems can be solved faster and much more efficiently. These techniques can not only be used for solid‐state laser systems, but can also be applied to solve other stiff problems which have near‐to‐zero nonnegative exact solutions. (© 2012 Wiley‐VCH Verlag GmbH & Co. KGaA, Weinheim)
Large deformation and plates
Authors: Rückert Jens , Meyer Arnd 
Published: December 2012

AbstractIn the simulation of deformations of plates it is well known that we have to use a special treatment of the thickness dependence. Therewith we achieve a reduction of dimension from 3D to 2D. For linear elasticity and small deformations several techniques are well established to handle the reduction of dimension and achieve acceptable numerical results. In the case of large deformations on plates with non‐linear material behaviour there exist different problems. For example the analytical integration over the thickness of the plate is not possible due to the non‐linearities arising from the material law and the large deformations themselves. There are several possibilities to introduce a hypothesis for the treatment of the plate thickness from the strong Kirchhoff assumption on one hand up to some hierarchical approaches on the other hand. (© 2012 Wiley‐VCH Verlag GmbH & Co. KGaA, Weinheim)
Hierarchical Preconditioning for PTAP‐Systems arising from particulate flows
Authors: Prignitz Rodolphe , Reitsam Andreas , Bänsch Eberhard 
Published: December 2012

AbstractParticulate flows, i.e. flow of an incompressible, Newtonian carrier fluid loaded with (many) rigid bodies, play an important role in diverse technical applications. In [1] a finite element method was introduced to simulate such flows. The method relies on a splitting method and a subspace projection method to incorporate the rigid body motion of the particles in a so called one domain approach [2]. The resulting systems arising after discretization are ill conditioned in general. Thus preconditioning is mandatory for instance when using an iterative Krylov subspace methods. In this paper we present a Schur complement based preconditioner well suited for this type of application. (© 2012 Wiley‐VCH Verlag GmbH & Co. KGaA, Weinheim)
Multiharmonic Finite Element Solvers for Time‐Periodic Parabolic Optimal Control Problems
Authors: Langer Ulrich , Wolfmayr Monika 
Published: December 2012

AbstractIn this note, we present some of our recent work on the multiharmonic analysis of a distributed parabolic optimal control problem in a time‐periodic setting. (© 2012 Wiley‐VCH Verlag GmbH & Co. KGaA, Weinheim)
State‐Constrained Optimization of PDEs via Infinite Penalization Methods
Authors: Barnard Richard , Frank Martin , Herty Michael 
Published: December 2012

AbstractWe consider optimization problems constrained by partial differential equations (PDEs) with additional constraints placed on the solution of the PDEs. Specifically, we consider problems involving constraints on the average value of the state in subdomains. We develop a general framework using infinite‐valued penalization functions and Clarke generalized gradients to obtain optimality conditions. A numerical example involving a linear elliptic PDE is presented. (© 2012 Wiley‐VCH Verlag GmbH & Co. KGaA, Weinheim)
Efficient Reduced Order State Space Model Computation for a Class of Second Order Index One Systems
Authors: Benner Peter , Kranz Burkhard , Saak Jens , Uddin M. Monir 
Published: December 2012

AbstractSimulation, design optimization and controller design of modern machine tools heavily rely on adequat numerical models. In order to achieve results in shorter computation times, reduced order models (ROMs) are applied in either of these tasks. Most modern simulation tools expect these ROMs to come in standard state space form. Structural models of the machine tool are however of second order type. In case piezo actuators are used in the device they are even differential algebraic equations (DAEs) of index one due to the coupling to the equations describing the electric potentials. This contribution is dedicated especially to those systems. We combine the ideas for balanced truncation model order reduction of large and sparse index 1 DAEs with methods developed for the efficient numerical handling of second order systems. (© 2012 Wiley‐VCH Verlag GmbH & Co. KGaA, Weinheim)
Modelling and control of a smart beam
Authors: Ghareeb Nader , Schmidt Ruediger 
Published: December 2012

AbstractIn this paper, a linear controller based on the Lyapunov stability theorem is designed and implemented on a smart beam. This smart beam consists of a steel beam with a piezoactuator bonded to it. The controller is used to attentuate the vibrations of the smart beam while exciting it by it's first eigenmode. A super element (SE) model of the same beam is firstly derived, and the controller is implemented on the SE and results are shown. (© 2012 Wiley‐VCH Verlag GmbH & Co. KGaA, Weinheim)
Approximately linear tracking control of nonlinear systems
Authors: Röbenack Klaus , Paschke Fabian 
Published: December 2012

AbstractAn elegant approach to control nonlinear state‐space systems is the exact input‐to‐state linearization, where a nonlinear change of coordinates combined with a nonlinear feedback law yields a linear controllable system. In this contribution, we treat the single‐input case, where input‐to‐state linearizability is equivalent to flatness. Sufficient and necessary existence conditions are well‐known, but quite restrictive. We propose the design of a tracking controller for flat single‐input systems, where the explicit knowledge of the flat output is not required. Our approach is based on a series expansion of the tracking error along a given reference trajectory. The controller gain can even be computed for non‐flat systems with regular controllability matrix. (© 2012 Wiley‐VCH Verlag GmbH & Co. KGaA, Weinheim)
Parameter identification for a heavy rope with internal damping
Authors: Gehring Nicole , Knüppel Torsten , Rudolph Joachim , Woittennek Frank 
Published: December 2012

AbstractA method is presented that allows for the identification of parameters in systems described by linear partial differential equations with spatially dependent coefficients. The approach uses operational calculus to generate equations that involve only convolution products of known (boundary) measurements and the system parameters. In particular, a heavy rope model with an internal damping and a horizontally moving suspension point is addressed. Knowledge of two trajectories at the suspension is sufficient to identify all physical parameters of the rope. This is also illustrated by a simulation result. (© 2012 Wiley‐VCH Verlag GmbH & Co. KGaA, Weinheim)
Well‐posedness and Conservativity for Linear Control Systems (Part 2)
Authors: Picard Rainer , Trostorff Sascha , Waurick Marcus 
Published: December 2012

AbstractUsing the results obtained in Part 1, we study conservativity of a certain class of linear control problems. For this purpose we require additional regularity properties of our solution operator in order to allow point‐wise evaluations of our solution. We apply the results to the linear control system with unbounded observation and control operators mentioned in Part 1. (© 2012 Wiley‐VCH Verlag GmbH & Co. KGaA, Weinheim)
A converse Lyapunov theorem for switched DAEs
Authors: Trenn Stephan , Wirth Fabian 
Published: December 2012

AbstractFor switched ordinary differential equations (ODEs) it is well known that exponential stability under arbitrary switching yields the existence of a common Lyapunov function. The result is known as a “converse Lyapunov Theorem”. In this note we will present a converse Lyapunov theorem for switched differential algebraic equations (DAEs) as well as the construction of a Barabanov norm for irreducible switched DAEs. (© 2012 Wiley‐VCH Verlag GmbH & Co. KGaA, Weinheim)
Intragranular deformation patterning through non‐convex rate dependent strain gradient crystal plasticity
Authors: Yalçinkaya Tuncay 
Published: December 2012

AbstractA rate dependent strain gradient crystal plasticity framework is presented where the displacement and the plastic slip fields are considered as primary variables. These coupled fields are determined on a global level by solving simultaneously the linear momentum balance and the slip evolution equation, which is derived in a thermodynamically consistent manner. The formulation is based on the 1D theory presented in Yalcinkaya et al. (2011), where the patterning of plastic slip is obtained in a system with non‐convex energetic hardening through a phenomenological double‐well plastic potential. In the current multi‐dimensional multi‐slip analysis the non‐convexity enters the framework through a latent hardening potential presented in Ortiz and Repettto (1999) where the microstructure evolution is obtained explicitly via a lamination procedure. The current study aims the implicit evolution of deformation patterns due to the incorporated physically based non‐convex potential. (© 2012 Wiley‐VCH Verlag GmbH & Co. KGaA, Weinheim)
Frequent GNAS and KRAS mutations in pyloric gland adenoma of the stomach and duodenum
Authors: Matsubara Akiko , Sekine Shigeki , Kushima Ryoji , Ogawa Reiko , Taniguchi Hirokazu , Tsuda Hitoshi , Kanai Yae 
Published: December 2012

AbstractGastric and duodenal adenomas exhibit a significant morphological and phenotypical diversity and are classified into intestinal‐type, foveolar‐type and pyloric gland adenomas. We analysed the mutations in GNAS, KRAS, BRAF and CTNNB1 and the expressions of mismatch repair (MMR) proteins in 80 gastric and 32 duodenal adenomas with histologically distinct subtypes, as well as in 71 gastric adenocarcinomas. Activating GNAS mutations were found in 22 of the 35 pyloric gland adenomas (PGAs; 63%) but in none of the foveolar‐type or intestinal‐type adenomas or the adenocarcinomas. Fourteen PGAs (41%), two foveolar‐type adenomas (9%), five intestinal‐type adenomas (9%) and one adenocarcinoma (1%) had KRAS mutations. BRAF mutations were absent in all the adenomas and adenocarcinomas that were examined. CTNNB1 mutations were only found in two intestinal‐type adenomas (4%). Notably, 13 of the 14 KRAS‐mutated gastric and duodenal PGAs had concurrent GNAS mutations. The loss of the MMR proteins, which is indicative of microsatellite instability, was observed in one PGA (3%), 12 foveolar‐type adenomas (52%), one intestinal‐type adenoma (2%) and five adenocarcinomas (7%). These observations indicate that each histological subtype of gastric and duodenal adenomas has a distinct genetic background. In particular, the present study identified the frequent presence of activating GNAS mutations, which are often associated with KRAS mutations, as a characteristic genetic feature of PGAs of the stomach and duodenum.
My changed body: breast cancer, body image, distress and self‐compassion
Authors: Przezdziecki Astrid , Sherman Kerry A. , Baillie Andrew , Taylor Alan , Foley Elizabeth , Stalgis‐Bilinski Kellie 
Published: December 2012

AbstractBackgroundBodily changes after breast cancer treatment can lead to long‐term distress. Self‐compassion, the ability to be kind to oneself, is an internal resource that may enhance a woman's ability to adjust to cancer‐related bodily changes. The aim of the present study was to test the hypothesis that self‐compassion mediates the relationship between body image and distress, controlling for alternate plausible mediators.MethodsMembers of a nationwide breast cancer consumer network were invited to participate. A total of 279 women who had finished active cancer treatment completed the online survey. Assessments included the Body Image Scale; Self‐compassion Scale; Depression, Anxiety and Stress Scale and items measuring perceived normative pressure and comfort with one's weight. Possible mediating effects of proposed variables on the body image–distress relationship were assessed.ResultsTests using a bootstrapping approach with multiple mediators were significant for self‐compassion on distress. Body image disturbance was indirectly associated with distress through low self‐compassion.ConclusionsBody image disturbance and lower self‐compassion were associated with increased psychological distress among these breast cancer survivors. This study provides preliminary evidence for a mediating role of self‐compassion between body image disturbance and psychological distress, suggesting a potentially protective effect of higher levels of self‐compassion for women at risk of experiencing body image disturbance. Copyright © 2012 John Wiley & Sons, Ltd.
Zebrafish: An In Vivo Model for Nano EHS Studies
Authors: Lin Sijie , Zhao Yan , Nel André E. , Lin Shuo 
Published: December 2012

AbstractTo assure a responsible and sustainable growth of nanotechnology, the environmental health and safety (EHS) aspect of engineered nanomaterials and nano‐related products needs to be addressed at a rate commensurate with the expansion of nanotechnology. Zebrafish has been demonstrated as a correlative in vivo vertebrate model for such task, and the current advances of using zebrafish for nano EHS studies are summarized here. In addition to morphological and histopathological observations, the accessibility of gene manipulation would greatly empower such a model for detailed mechanistic studies of any nanoparticles of interest. The potential for establishing high‐throughput screening platforms to facilitate the nano EHS studies is highlighted, and a discussion is presented on how toxicogenomics approaches represent a future direction to guide the identification of toxicity pathways.