bluuebunny/crossref_metadata_2025_split huggingface dataset:
An application of some high order operator splitting methods to systems of stiff differential equations
Authors: Sánchez‐Bernabe Francisco J. , Salcedo‐Ruz Javier 
Published: December 2008

AbstractIn this work we compare operator splitting methods of high order that are applied to problems with stiff matrices. In order to efficiently solve the resultant subproblems is possible to use implicit Runge‐Kutta methods. We apply an alternative extrapolation technique that works well for the tested problems. (© 2008 WILEY‐VCH Verlag GmbH & Co. KGaA, Weinheim)
Sufficient conditions of the existence forced periodic solutions in the automatic controlled systems with the hysteresis feedback (Poster Presentation)
Authors: Semenov M.E. , Butov A.S. , Gulin A.N. , Tolokonnikov P.V. 
Published: December 2008

AbstractThis article is devoted to Control system with the Hysteresis Nonlinearities. (© 2008 WILEY‐VCH Verlag GmbH & Co. KGaA, Weinheim)
Numerical stability of the KdV equation with a negative forcing
Authors: Whang Sungim , Choi Jeongwhan 
Published: December 2008

AbstractThe waves at the free surface waves of an incompressible and inviscid fluid in a two dimensional domain with horizontal rigid flat bottom with a small obstruction are considered. A time dependent KdV equation with a negative forcing is derived and studied both theoretically and numerically. The existence of a negative solitary‐wave‐like solution of the equation near the Froude number is proved and the numerical stability of the solution is also studied. The numerical stability of the positive both symmetric and unsymmetric solitary‐wave‐like solutions are also studied. (© 2008 WILEY‐VCH Verlag GmbH & Co. KGaA, Weinheim)
Rayleigh‐Benard convection in a dielectric liquid: time‐periodic body force
Authors: Siddheshwar Pradeep G. , Abraham Annama 
Published: December 2008

AbstractWe discuss the thermal instability in a layer of dielectric fluid when the boundaries of the layer are subjected to small amplitude Time‐periodic body force (TBF). Perturbation solution in powers of the amplitude of the applied temperature field is obtained using the Venezian method (1969) [1]. A linear stability analysis is performed. The results of the study, indicate that TBF or g‐jitter leads to delayed convection Also for large frequencies the effect of TBF disappears.The problem has relevance in many dielectric fluid applications wherein regulation of thermal convection is called for. (© 2008 WILEY‐VCH Verlag GmbH & Co. KGaA, Weinheim)
Elastic‐plastic states of a rotating inhomogeneously heated strain hardening hollow shaft
Authors: Arslan E. , Eraslan A. N. , Mack3 W. 
Published: December 2008

AbstractBased on Tresca's yield criterion and the flow rule associated with it, the behaviour of a linearly strain‐hardening elastic‐plastic hollow shaft subject to a positive radial temperature gradient and monotonously increasing angular speed is studied. (© 2008 WILEY‐VCH Verlag GmbH & Co. KGaA, Weinheim)
Dynamic K‐L analysis of coherent structures based on DNS of turbulent Newtonian and viscoelastic flows
Authors: Samanta Gaurab , Oxberry Geoffrey , Beris Antony N. , Handler Robert , Housiadas Kostas 
Published: December 2008

AbstractEarlier work [1, 2], using Karhunen‐Loeve (K‐L) analysis, demonstrated a dramatic enhancement of the importance of large scale motions with increased viscoelasticity and an equally dramatic decrease in the K‐L dimension of the flow (an order of magnitude) as viscoelasticity increases versus similar Newtonian results. In this work we look into dynamics of viscoelastic turbulent flows by projecting the DNS data in time into a selected set of K‐L modes. The dynamics of the coherent structures embedded in turbulent flows were investigated through calculations of mode auto and cross correlations. This allows for a more systematic examination of the role of large‐scale structures in turbulence and drag reduction. (© 2008 WILEY‐VCH Verlag GmbH & Co. KGaA, Weinheim)
Computation of Feynman loop integrals
Authors: de Doncker Elise , Shimizu Yoshimitzu , Fujimoto Junpei , Yuasa Fukuko 
Published: December 2008

AbstractWe address multivariate integration and extrapolation techniques for the computation of Feynman loop integrals. Loop integrals are required for perturbation calculations in high energy physics, as they contribute corrections to the scattering amplitude and the cross section for the collision of elementary particles. We use iterated integration to calculate the multivariate integrals. The combined integration and extrapolation methods aim for an automatic calculation, where little or no analytic manipulation is required before the numeric approximation. (© 2008 WILEY‐VCH Verlag GmbH & Co. KGaA, Weinheim)
A variational free‐Lagrange method for shallow water
Authors: Dixon Matthew F. , Ringler Todd 
Published: December 2008

AbstractThis article presents a variational free‐Lagrange (VFL) method for rotating shallow water. This method was first derived by Augenbaum [2] who discretised Hamilton's action principle with a free‐Lagrange data structure. The novel feature of our approach is to exploit the geometric structure preserved by the VFL method to the effect of conserving energy over long‐time simulations. Numerical results demonstrate this property and motivate the extension of this approach to other variational formulations of climate models. (© 2008 WILEY‐VCH Verlag GmbH & Co. KGaA, Weinheim)
Recent advances in Krylov subspace spectral methods
Authors: Lambers James V. 
Published: December 2008

AbstractThis paper reviews the main properties, and most recent developments, of Krylov subspace spectral (KSS) methods for time‐dependent variable‐coefficient PDE. These methods use techniques developed by Golub and Meurant for approximating elements of functions of matrices by Gaussian quadrature in the spectral domain in order to achieve high‐order accuracy in time and stability characteristic of implicit time‐stepping schemes, even though KSS methods themselves are explicit. In fact, for certain problems, 1‐node KSS methods are unconditionally stable. Furthermore, these methods are equivalent to high‐order operator splittings, thus offering another perspective for further analysis and enhancement. (© 2008 WILEY‐VCH Verlag GmbH & Co. KGaA, Weinheim)
Lessons from the trenches: A survey of approaches for large‐scale projects
Authors: Miner Robert 
Published: December 2008

AbstractTechnical documents are generally difficult to author, publish and maintain due to the complexity inherent in mathematical notation, diagrams, and tables. This article surveys approaches for addressing these challenges used by large‐scale, Web‐based projects involving ongoing workflows. Such workflows fall into four broad categories: the XML Repository model, the TeX Repository model, the Page Layout model, and exotic models. (© 2008 WILEY‐VCH Verlag GmbH & Co. KGaA, Weinheim)
A hybrid Langrangian scheme for vehicular traffic flow
Authors: Moutari S. , Rascle M. 
Published: December 2008

AbstractWe introduce a fully discrete hybrid scheme for vehicular traffic flow, combining a microscopic description around obstacles such as traffic lights, toll stations, intersections … and a macroscopic description elsewhere. The presented approach is shown to be theoretically rigorous, numerically reliable, and computationally efficient. (© 2008 WILEY‐VCH Verlag GmbH & Co. KGaA, Weinheim)
Mathematical modelling on harmful algal blooms in the presence of toxic substances
Authors: Pal S. 
Published: December 2008

AbstractEffect of toxin producing plankton and its control is an intriguing problem in marine plankton ecology. In this paper we have proposed a three‐component model consisting of a non‐toxic phytoplankton (NTP), toxin producing phytoplankton (TPP) and zooplankton (Z), where the growth of zooplankton species reduce due to toxic chemicals released by phytoplankton species. It is observed that the three components persist if the predation rate of zooplankton population on toxic phytoplankton is bounded in certain regions. (© 2008 WILEY‐VCH Verlag GmbH & Co. KGaA, Weinheim)
Additive preconditioning in matrix computations
Authors: Pan V. Y. , Murphy B. , Rosholt R.E. , Ivolgin D. , Qian G. , Taj‐Eddin I. , Tang Y. , Yan X. 
Published: December 2008

AbstractWe combine our novel SVD‐free additive preconditioning with aggregation and other relevant techniques to facilitate the solution of a linear system of equations and other fundamental matrix computations. Our analysis and experiments show the power of our algorithms, guide us in selecting most effective policies of preconditioning and aggregation, and provide some new insights into these and related subjects. Compared to the popular SVD‐based multiplicative preconditioners, our additive preconditioners are generated more readily and for a much larger class of matrices. Furthermore, they better preserve matrix structure and sparseness and have a wider range of applications (e.g., they facilitate the solution of a consistent singular linear system of equations and of the eigen‐problem). (© 2008 WILEY‐VCH Verlag GmbH & Co. KGaA, Weinheim)
Mathematical model for waste minimization of a bleach plant in paper industry
Authors: Singh V.P. , Kumar Vivek , Kumar Deepak 
Published: December 2008

AbstractIn the present investigation a steady‐state mathematical model is developed for a typical four stage CEHH bleaching sequence in Indian Pulp and Paper Industry. Each stage of the sequence is composed of chemical additions and mixing, reaction in a retention tower, and washing. Unit operation models were formulated using mass balances on liquor, fibres, kappa number, chemicals and COD based on the assumption of perfect mixing and quasi steady‐state. The COD is used in this paper as an indication of the amount of effluent coming out from four bleaching stages. In order to validate the model, the simulated results are compared with the literature data; a good agreement is achieved between the simulated results with the literature data. (© 2008 WILEY‐VCH Verlag GmbH & Co. KGaA, Weinheim)
Verified global optimization with GloptLab
Authors: Domes Ferenc , Neumaier Arnold 
Published: December 2008

AbstractGloptLab is a testing and development platform for solving quadratic constraint satisfaction problems, written in MATLAB.All applied methods are rigorous, hence it is guaranteed that no feasible point is lost. Some emphasis is given to finding a bounded initial box containing all feasible points, in cases where other complete solvers rely on non‐rigorous heuristics.The algorithms implemented in GloptLab are used to reduce the search space: scaling, constraint propagation, linear relaxations, strictly convex enclosures, conic methods, and branch and bound. From the method repertoire custom made strategies can be built, with a user friendly graphical interface. (© 2008 WILEY‐VCH Verlag GmbH & Co. KGaA, Weinheim)
The modelling and dynamic analysis of flow through the aortic valve during the cardiac cycle
Authors: Konderla Piotr , Patralski Krzysztof 
Published: December 2008

AbstractThe object under study is an aortic valve, located in the aortic annulus. The aortic valve leaflet has been assumed to be a three‐dimensional object. The computations were performed using the Ansys Multiphysics system. The result of our analysis takes the form of a model describing the interaction between two domains. The opening of the aortic valve model was obtained by iteration process. (© 2008 WILEY‐VCH Verlag GmbH & Co. KGaA, Weinheim)
An introduction to pathodynamics from the view of homeostasis and beyond
Authors: Trost Donald C. 
Published: December 2008

AbstractThis presentation discusses how dynamic models and Brownian motion methods can be applied to the analysis of clinical measurements. This approach has the potential to facilitate the understanding of biological systems on a macroscopic scale, much like thermodynamics did for physical chemistry. (© 2008 WILEY‐VCH Verlag GmbH & Co. KGaA, Weinheim)
A complete classification of bifurcation diagrams of a p ‐Laplacian Dirichlet problem
Authors: Lee Shin‐Yi , Liui Jong‐Yi , Wang Shin‐Hwa , Yei Chiou‐Ping 
Published: December 2008

AbstractWe study the bifurcation diagrams of (classical) positive solutions u with |u |∞ ∈ (0, ∞) of the p ‐Laplacian Dirichlet problem (φp (u ′(x)))′ + λfq (u (x))) = 0, –1 ≤ x ≤ 1, u (–1) = 0 = u (1), where p > 1, φp (y) = |y |p –2 y, (φp (u ′))′ is the one‐dimensional p ‐Laplacian, λ > 0 is a bifurcation parameter, and the nonlinearity fq (u) = |1 – u |q is defined on [0, ∞) with constant q > 0. (© 2008 WILEY‐VCH Verlag GmbH & Co. KGaA, Weinheim)
Fabrication of biodegradable poly(trimethylene carbonate) networks for potential tissue engineering scaffold applications
Authors: Zhang C. , Subramanian H. , Grailer J. J. , Tiwari A. , Pilla S. , Steeber D. A. , Gong S. 
Published: December 2008

AbstractBiodegradable poly(trimethylene carbonate) (PTMC) networks were prepared by photopolymerization of linear (L)‐ and star (S)‐shaped PTMC macromonomers for potential tissue engineering scaffold applications. The L‐ (Mn, 6400) and S‐shaped (Mn, 5880) PTMC macromonomers were synthesized using 1,4‐butane diol and 2‐ethyl‐ 2‐hydroxyl‐propane‐1,3‐diol co‐initiated ring‐opening polymerization of trimethylene carbonate (TMC) in the presence of stannous octoate and subsequent acrylation with acryloyl chloride. Chemical structures of the PTMC macromonomers and their corresponding networks were characterized by 1H NMR and 13C NMR spectroscopy. The human endothelial cell line, EA.hy926 was used to test the biocompatibility, cell adhesion, and proliferation behavior of both PTMC networks. The PTMC networks made from the S‐shaped macromonomers exhibited superior cell adhesion and proliferation behavior than those made of the linear macromonomers. Copyright © 2008 John Wiley & Sons, Ltd.
Synthesis and characterization of polyaniline: nanospheres, nanorods, and nanotubes—catalytic application for sulfoxidation reactions
Authors: Sreedhar B. , Radhika P. , Neelima B. , Hebalkar Neha , Rao M. V. Basaveswara 
Published: December 2008

AbstractThe synthesis of nanostructured polyaniline (PANI) with different morphologies by simple alkali‐guided template‐free method followed by doping them with vanadium has been described. The synthesized polyaniline nanoparticles have been well characterized by various techniques. Further, the catalytic activity of the undoped and doped PANI nanostructures for selective oxidation of sulfides to sulfoxides in water has been studied. It was observed that the special morphology of nanostructures plays an important role in enhancement of catalytic activity. Vanadium‐doped PANI nanotubes and nanorods showed higher activity and selectivity than nanospheres. The catalyst has been reused for five consecutive cycles with consistent activity. Copyright © 2008 John Wiley & Sons, Ltd.
Synthesis and characterization of liquid crystalline elastomers bearing fluorinated mesogenic units and crosslinking mesogens
Authors: Meng Fan‐Bao , Chen Hai‐Bin , Liu Dan , Zhang Bao‐Yan , Jia Chao 
Published: December 2008

AbstractSeveral new side‐chain liquid crystalline (LC) polysiloxanes and elastomers (IP‐VIP) bearing fluorinated mesogenic units and crosslinking mesogens were synthesized by a one‐step hydrosilylation reaction with poly(methylhydrogeno)siloxane, a fluorine‐containing LC monomer 4′‐undec‐10‐enoyloxy‐biphenyl‐4‐yl 4‐fluoro‐benzoate and a crosslinking LC monomer 4′‐(4‐allyloxy‐benzoxy)‐biphenyl‐4‐yl 4‐allyloxy‐benzoate. The chemical structures and LC properties of the monomers and polymers were characterized by use of various experimental techniques such as FTIR, 1H‐NMR, EA, TGA, DSC, POM and XRD. The effect of crosslinking mesogens on mesomorphic properties of the fluorinated LC polymers was studied as well. The obtained polymers and elastomers were soluble in many solvents such as toluene, tetrahydrofuran, chloroform, and so forth. The temperatures at which 5% weight loss occurred (Td) were greater than 250°C for all the polymers, and the weight of residue near 600°C increased slightly with increase of the crosslinking mesogens in the fluorinated polymer systems. The samples IP, IIP, IIIP and IVP showed both smectic A and nematic phases when they were heated and cooled, but VP and VIP exhibited only a nematic mesophase. The glass transition temperature (Tg) of polymers increased slightly with increase of crosslinking mesogens in the polymer systems, but the mesophase–isotropic phase transition temperature (Ti) and smectic A–nematic mesophase transition temperature (TS‐N) decreased slightly. It suggests that the temperature range of the mesophase became narrow with the increase of crosslinking mesogens for all the fluorinated polymers and elastomers. In XRD curves, the intensity of sharp reflections at low angle decreased with increase of crosslinking mesogens in the fluorinated polymers systems, indicating that the smectic order derived from fluorinated mesogenic units should be destroyed by introduction of more crosslinking mesogens. Copyright © 2008 John Wiley & Sons, Ltd.
Estimating the effect of current, previous and never use of drugs in studies based on prescription registries
Authors: Nielsen Lars Hougaard , Løkkegaard Ellen , Andreasen Anne Helms , Hundrup Yrsa Andersen , Keiding Niels 
Published: December 2008

AbstractPurposeMany studies which investigate the effect of drugs categorize the exposure variable into never, current, and previous use of the study drug. When prescription registries are used to make this categorization, the exposure variable possibly gets misclassified since the registries do not carry any information on the time of discontinuation of treatment.In this study, we investigated the amount of misclassification of exposure (never, current, previous use) to hormone therapy (HT) when the exposure variable was based on prescription data. Furthermore, we evaluated the significance of this misclassification for analysing the risk of breast cancer.Materials and methodsPrescription data were obtained from Danish Registry of Medicinal Products Statistics and we applied various methods to approximate treatment episodes. We analysed the duration of HT episodes to study the ability to identify discontinuation of therapy from prescription data. Furthermore, we compared to results based on self‐reported duration of HT from the Danish Nurse Cohort.Finally, we analysed the effect of HT exposure on time to breast cancer for the different prescription based exposure variables as well as for self‐reported HT use.ResultsThe results of time to discontinuation varied strongly across the different HT assessments. However, misclassification of HT exposure at baseline was limited and hence analysis of the effect of HT on time to breast cancer showed stability across the different exposure assessments with Hazard Ratios ranging from 1.68 to 1.78 for current use compared to never use.ConclusionsThe findings suggest that it is possible to estimate the effect of never, current and previous use of HT on breast cancer using prescription data. Copyright © 2008 John Wiley & Sons, Ltd.
A SELDI‐TOF MS procedure for the detection, quantitation, and preliminary characterization of low‐molecular‐weight recombinant proteins expressed in transgenic plants
Authors: Badri M. Amine , Rivard Daniel , Coenen Karine , Vaillancourt Louis‐Philippe , Goulet Charles , Michaud Dominique 
Published: December 2008

AbstractWe describe a SELDI‐TOF MS procedure for the rapid detection and quantitation of low‐molecular‐weight recombinant proteins expressed in plants. Transgenic lines of potato (Solanum tuberosum L.) expressing the clinically useful protein bovine aprotinin or the cysteine protease inhibitor corn cystatin II were generated by Agrobacterium tumefaciens‐mediated transformation, and then used as test material for the analyses. Real‐time RT‐PCR amplifications and detection of the recombinant proteins by immunoblotting were first conducted for transformed potato lines accumulating the proteins in different cell compartments. Both proteins were found at varying levels in leaves, depending on their final cellular destination and transgene expression rate. These conclusions drawn from standard immunodetection assays were easily confirmed by SELDI‐TOF MS comparative profiling, after immobilizing the leaf proteins of control and transformed lines on protein biochips for weak cationic exchange. This procedure, carried out in less than 2 h, allows for the rapid comparison of recombinant protein levels in transgenic plant lines. The molecular weight of immobilized proteins can also be determined directly from the MS spectra, thus providing a simple way to assess the structural integrity and homogeneity of recombinant proteins in planta, and to identify the most suitable cellular compartments for their heterologous production.
Dissecting the proteome of pea mature seeds reveals the phenotypic plasticity of seed protein composition
Authors: Bourgeois Michael , Jacquin Françoise , Savois Vincent , Sommerer Nicolas , Labas Valérie , Henry Céline , Burstin Judith 
Published: December 2008

AbstractPea (Pisum sativum L.) is the most cultivated European pulse crop and the pea seeds mainly serve as a protein source for monogastric animals. Because the seed protein composition impacts on seed nutritional value, we aimed at identifying the determinants of its variability. This paper presents the first pea mature seed proteome reference map, which includes 156 identified proteins (http://www.inra.fr/legumbase/peaseedmap/). This map provides a fine dissection of the pea seed storage protein composition revealing a large diversity of storage proteins resulting both from gene diversity and post‐translational processing. It gives new insights into the pea storage protein processing (especially 7S globulins) as a possible adaptation towards progressive mobilization of the proteins during germination. The nonstorage seed proteome revealed the presence of proteins involved in seed defense together with proteins preparing germination. The plasticity of the seed proteome was revealed for seeds produced in three successive years of cultivation, and 30% of the spots were affected by environmental variations. This work pinpoints seed proteins most affected by environment, highlighting new targets to stabilize storage protein composition that should be further analyzed.
Two‐dimensional gel‐based approaches for the assessment of N‐Linked and O‐GlcNAc glycosylation in human and simian immunodeficiency viruses
Authors: Graham David R. M. , Mitsak Megan J. , Elliott Steven T. , Chen Dawn , Whelan Stephen A. , Hart Gerald W. , Van Eyk Jennifer E. 
Published: December 2008

AbstractThe glycosylation state of envelope glycoproteins in human and simian immunodeficiency viruses (HIV/SIV) is critical to viral infectivity and tropism, viral protein processing, and in virus evasion of the immune system. Using a rapid fluorescent 2‐D gel‐based method coupled with enzymatic pre‐treatment of virus with PNGase F (Peptide: N‐Glycosidase F) and fluorescent 2‐D gels or 2‐D gel Western blotting, we show significant differences in the glycosylation patterns of two SIV strains widely used in animal models of HIV disease and vaccine studies. We also demonstrate the modification of a host protein important in HIV biology (HLA‐DR) by O‐GlcNAc. Further, this experimental pipeline allows for the identification of the modified protein and the site of N‐linked glycosylation by fluorescent 2‐DE coupled with MS and the qualitative and semi‐quantitative assessment of viral glycosylation. The method is fully compatible with downstream glycomics analysis. This approach will permit correlation of virus glycosylation status with pathological severity and may serve as a rapid screen of viruses from physiological samples for further study by more advanced MS methodology.