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Upwind and High-Resolution Methods for Compressible Flow:From Donor Cell to Residual-Distribution Schemes

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Communications in Computational Physics 2006年第2期1卷 192-206页

作者： bram van Leer W.M.Keck Foundation Laboratory for Computational Fluid Dynamics Department of Aerospace EngineeringThe University of MichiganAnn ArborMI 48108-2140USA

In this paper I review three key topics in CFD that have kept researchers busy for half a ***,the concept of upwind differencing,evident for 1-D linear ***,its implementation for nonlinear systems in the form of highresolution schemes,now regarded as ***,its genuinely multidimensional implementation in the form of residual-distribution schemes,the most recent *** lecture focuses on historical developments;it is not intended as a technical review of methods,hence the lack of formulas and absence of figures.

关键词： Upwind difference high-resolution method compressible flow nonlinear conservation laws

On the Fourier Spectra of Distributions in Clifford Analysis

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Chinese Annals of Mathematics,Series B 2006年第5期27卷 495-506页

作者： Fred BRACKX bram De KNOCK Hennie De SCHEPPER Clifford Research Group Department of Mathematical Analysis Faculty of EngineeringGhent UniversityGalglaan 29000 GentBelgium

In recent papers by Brackx, Delanghe and Sommen, some fundamental higher dimensional distributions have been reconsidered in the framework of Clifford analysis, eventually leading to the introduction of four broad classes of new distributions in Euclidean space. In the current paper we continue the in-depth study of these distributions, more specifically the study of their behaviour in frequency space, thus extending classical results of harmonic analysis.

关键词： Fourier spectra Distributions Clifford analysis

Is losing ethylene a losing game?

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Molecular Plant 2022年第5期15卷 788-790页

作者： bram Van de Poel Caren Chang Division of Crop Biotechnics Department of BiosystemsUniversity of LeuvenWillem de Croylaan 423001 LeuvenBelgium Department of Cell Biology and Molecular Genetics University of MarylandCollege ParkMDUSA

It is well established that the gaseous plant hormone ethylene modulates growth and development and mediates re-sponses to biotic and abiotic *** plants produce ethylene from S-adenosyl-L-methionine,which is converted to 1-aminocyclopropane-1-carboxylic acid(ACC)by ACC synthase(ACS);ACC is then converted to ethylene by a dedicated enzyme,ACC oxidase(ACO)(Figure 1A).

关键词： Figure converted media

Special issue： Technologies for future high-efficiency industrial silicon wafer solar cells

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Frontiers in Energy 2017年第1期11卷 1-3页

作者： Dr. Wenzhong SHEN Dr. bram HOEX Professor Shanghai Jiao Tong University China

In this special issue we have twelve articles from researchers in Australia and China that discuss various aspects related to technology which could be imple- mented in the near term in industrial silicon wafer solar cells. In the recent years we have seen the introduction of the passivated emitter rear contact （PERC） solar cell, which was invented at UNSW Australia in the 1980s.

关键词： solar cells Wafers Industrial Silicon wafers PPARGC1B gene Wafer Dosage Form

Bilinear Forms for the Recovery-Based Discontinuous Galerkin Method for Diffusion

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Communications in Computational Physics 2009年第2期5卷 683-693页

作者： Marc van Raalte bram van Leer Centrum voor Wiskunde en Informatica P.O.Box 940791090 GB AmsterdamThe Netherlands W.M.Keck Foundation Laboratory for Computational Fluid Dynamics Department of Aerospace EngineeringThe University of MichiganAnn ArborMI 48109-2140USA

The present paper introduces bilinear forms that are equivalent to the recovery-based discontinuous Galerkin formulation introduced by Van Leer in *** recovery method approximates the solution of the diffusion equation in a discontinuous function space,while inter-element coupling is achieved by a local L_(2)projection that recovers a smooth continuous function underlying the discontinuous *** we introduce the concept of a local“recovery polynomial basis”–smooth polynomials that are in the weak sense indistinguishable from the discontinuous basis polynomials–and show it allows us to eliminate the recovery *** recovery method reproduces the symmetric discontinuous Galerkin formulation with additional penalty-like terms depending on the targeted accuracy of the *** present the unique link between the recovery method and discontinuous Galerkin bilinear forms.

关键词： Diffusion equation discontinuous Galerkin methods recovery basis L_(2)projection

Enzymatic co-crosslinking of star-shaped poly(ethylene glycol)tyramine and hyaluronic acid tyramine conjugates provides elastic biocompatible and biodegradable hydrogels

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Bioactive Materials 2023年第2期20卷 53-63页

作者： Rong Wang Xiaobin Huang bram Zoetebier Pieter JDijkstra Marcel Karperien Department of Developmental BioEngineering Faculty of Science and TechnologyTech Med CentreUniversity of TwenteP.O.Box 2177500 AEEnschedethe Netherlands Radboudumc Dept.of Dentistry-Regenerative BiomaterialsRadboud University Medical CenterPhilips van Leydenlaan 256525 EX NijmegenThe Netherlands Department of Oral and Maxillofacial Surgery School of Dental MedicineUniversity of Pennsylvania240 South 40th StreetPhiladelphiaPA 19104-6030US

A combination of the viscoelastic properties of hyaluronic acid(HA)and the elastic properties of star shaped 8-arm poly(ethylene glycol)(8-arm PEG)was used to design in-situ forming *** were prepared by the enzymatic crosslinking of a partially tyramine modified 8-arm PEG and a tyramine conjugated HA using horseradish peroxidase in the presence of hydrogen *** of the homopolymer conjugates and mixtures thereof were rapidly formed within seconds under physiological conditions at low polymer and enzyme *** hydrogels with high gel content(≥95%)and high storage moduli(up to 22.4 kPa)were *** in vitro study in the presence of hyaluronidase(100 U/mL)revealed that with increasing PEG content the degradation time of the hybrid hydrogels increased up to several weeks,whereas hydrogels composed of only hyaluronic acid degraded within 2 *** mesenchymal stem cells(hMSCs)incorporated in the hybrid hydrogels remained viable as shown by a PrestoBlue and a live-dead assay,confirming the biocompatibility of the *** production of an extracellular matrix by re-differentiation of encapsulated human chondrocytes was followed over a period of 28 *** expression indicated that these highly elastic hydrogels induced an enhanced production of collagen type *** low PEG-TA/HA-TA ratios a higher expression of SOX 9 and ACAN was *** results indicate that by modulating the ratio of PEG/HA,injectable hydrogels can be prepared applicable as scaffolds for tissue regeneration applications.

关键词： PEG-OH8 HA Enzymatic crosslinking hydrogel Degradation Proliferation&differentiation

POCl3 diffusion for industrial Si solar cell emitter formation

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Frontiers in Energy 2017年第1期11卷 42-51页

作者： Hongzhao LI Kyung KIM Brett HALLAM bram HOEX Stuart WENHAM Malcolm ABBOTT School of Photovoltaic and Renewable Energy Engineering UNSW Australia Sydney NSW 2052 Australia

POCl3 diffusion is currently the de facto standard method for industrial n-type emitter fabrication. In this study, we present the impact of the following processing parameters on emitter formation and electrical performance： deposition gas flow ratio, drive-in tempera- ture and duration, drive-in O2 flow rate, and thermal oxidation temperature. By showing their influence on the emitter doping profile and recombination activity, we provide an overall strategy for improving industrial POCl3 tube diffused emitters.

关键词： POCl3 diffusion emitter recombination oxidation silicon

UV-B light and its application potential to reduce disease and pest incidence in crops

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Horticulture Research 2021年第1期8卷 2650-2669页

作者： Prisca Meyer bram Van de Poel Barbara De Coninck Division of Crop Biotechnics Department of BiosystemsKU Leuven3001 LeuvenBelgium

Ultraviolet-B radiation(280–315 nm),perceived by the plant photoreceptor UVR8,is a key environmental signal that influences plant growth and development and can reduce disease and pest *** positive effect of UV-B on disease resistance and incidence in various plant species supports the implementation of supplemental UV-B radiation in sustainable crop ***,despite many studies focusing on UV-B light,there is no consensus on the best mode of *** review aims to analyze,evaluate,and organize the different application strategies of UV-B radiation in crop production with a focus on disease *** summarize the physiological effects of UV-B light on plants and discuss how plants perceive and transduce UV-B light by the UVR8 photoreceptor as well as how this perception alters plant specialized metabolite ***,we bring together conclusions of various studies with respect to different UV-B application methods to improve plant *** general,supplemental UV-B light has a positive effect on disease resistance in many plant–pathogen combinations,mainly through the induction of the production of specialized ***,many variables(UV-B light source,plant species,dose and intensity,timing during the day,duration,background light,etc.)make it difficult to compare and draw general *** compiled the information of recent studies on UV-B light applications,including e.g.,details on the UV-B light source,experimental set-up,calculated UV-B light dose,intensity,and *** review provides practical insights and facilitates future research on UV-B radiation as a promising tool to reduce disease and pest incidence.

关键词： application light specialized

A Preconditioned Iterative Solver for the Scattering Solutions of the Schr¨odinger Equation

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Communications in Computational Physics 2012年第2期11卷 415-434页

作者： Hisham bin Zubair bram Reps Wim Vanroose Department of Mathematical Sciences Faculty of Computer ScienceInstitute of Business AdministrationUniversity Rd.75270 KarachiPakistan Department of Mathematics and Computer Science University of AntwerpMiddelheimlaan 1B-2020 AntwerpenBelgium

The Schrodinger equation defines the dynamics of quantum particles which has been an area of unabated interest in *** demonstrate how simple transformations of the Schrodinger equation leads to a coupled linear system,whereby each diagonal block is a high frequency Helmholtz *** on this model,we derive indefinite Helmholtz model problems with strongly varying *** employ the iterative approach for their *** particular,we develop a preconditioner that has its spectrum restricted to a quadrant(of the complex plane)thereby making it easily invertible by multigrid methods with standard *** multigrid preconditioner is used in conjunction with suitable Krylov-subspace methods for solving the indefinite Helmholtz model *** aim of this study is to report the feasibility of this preconditioner for the model *** compare this idea with the other prevalent preconditioning ideas,and discuss its *** of numerical experiments are presented,which complement the proposed ideas,and show that this preconditioner may be used in an automatic setting.

关键词： Scattering Schrodinger equation exterior complex scaling preconditioning multigrid complex-shifted Laplacian(CSL) complex-scaled grid(CSG) quadrant-definite(QD)