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Finite Volume Evolution Galerkin Methods for the Shallow Water Equations with Dry Beds

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Communications in Computational Physics 2011年第7期10卷 371-404页

作者： Andreas Bollermann Sebastian Noelle Maria Lukacova-Medvid’ova IGPM RWTH AachenTemplergraben 5552062 AachenGermany Institut fur Mathematik Universitat MainzStaudingerweg 955099 MainzGermany.

We present a new Finite Volume Evolution Galerkin(FVEG)scheme for the solution of the shallow water equations(SWE)with the bottom topography as a source *** new scheme will be based on the FVEG methods presented in(Noelle and Kraft,***.,221(2007)),but adds the possibility to handle dry *** most important aspect is to preserve the positivity of the water *** present a general approach to ensure this for arbitrary finite volume *** main idea is to limit the outgoing fluxes of a cell whenever they would create negative water ***,this corresponds to the absence of fluxes in the presence of *** is then re-established by splitting gravitational and gravity driven parts of the ***,a new entropy fix is introduced that improves the reproduction of sonic rarefaction waves.

关键词： Well-balanced schemes dry boundaries shallow water equations evolution Galerkin schemes source terms

A Novel Full-Euler Low Mach Number IMEX Splitting

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Communications in Computational Physics 2020年第1期27卷 292-320页

作者： Jonas Zeifang Jochen Schutz Klaus Kaiser Andrea Beck Maria Lukacova-Medvid’ova Sebastian Noelle IAG Universiẗat StuttgartPfaffenwaldring 21DE-70569 StuttgartGermany Faculty of Sciences Hasselt UniversityAgoralaan Gebouw DBE-3590 DiepenbeekBelgium IGPM RWTH Aachen UniversityTemplergraben 55DE-52062 AachenGermany Institut f̈ur Mathematik Johannes Gutenberg-Universiẗat MainzStaudingerweg 9DE-55128 MainzGermany

In this paper,we introduce an extension of a splitting method for singularly perturbed equations,the socalled RS-IMEX splitting[Kaiser et al.,Journal of Scientific Computing,70(3),1390–1407],to deal with the fully compressible Euler *** straightforward application of the splitting yields sub-equations that are,due to the occurrence of complex eigenvalues,not hyperbolic.A modification,slightly changing the convective flux,is introduced that overcomes this *** is shown that the splitting gives rise to a discretization that respects the low-Mach number limit of the Euler equations;numerical results using finite volume and discontinuous Galerkin schemes show the potential of the discretization.

关键词： Euler equations low-Mach IMEX Runge-Kutta RS-IMEX

New High-Order Numerical Methods for Hyperbolic Systems of Nonlinear PDEs with Uncertainties

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Communications on Applied Mathematics and Computation 2024年第3期6卷 2011-2044页

作者： Alina Chertock Michael Herty Arsen S.Iskhakov safa Janajra Alexander Kurganov Maria Lukacova-Medvid'ova Department of Mathematics North Carolina State UniversityRaleighNCUSA Department of Mathematics RWTH Aachen UniversityAachenGermany Department of Mathematics Shenzhen International Center for Mathematicsand Guangdong Provincial Key Laboratory of Computational Science and Material DesignSouthern University of Science and TechnologyShenzhen 518055GuangdongChina Institute of Mathematics Johannes Gutenberg University MainzMainzGermany

In this paper,we develop new high-order numerical methods for hyperbolic systems of nonlinear partial differential equations(PDEs)with *** new approach is realized in the semi-discrete finite-volume framework and is based on fifth-order weighted essentially non-oscillatory(WENO)interpolations in(multidimensional)random space combined with second-order piecewise linear reconstruction in physical *** with spectral approximations in the random space,the presented methods are essentially non-oscillatory as they do not suffer from the Gibbs phenomenon while still achieving high-order *** new methods are tested on a number of numerical examples for both the Euler equations of gas dynamics and the saint-Venant system of shallow-water *** the latter case,the methods are also proven to be well-balanced and positivity-preserving.

关键词： Hyperbolic conservation and balance laws with uncertainties Finite-volume methods Central-upwind schemes Weighted essentially non-oscillatory(WENO)interpolations

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2022时间之最腕表大奖14th得奖揭晓

钟表 2022年第6期53卷 82-87页

作者： ova 不详

因疫情睽违近三年的CHAMPIONS OF TIME时间之最腕表大奖,今年终于重启,并在上海举办盛大的颁奖活动。秉持专业至上、公正中立,主办单位自五年前开始诚挚邀请来自台湾、香港与中国内地共100位专家组成钟表达人高峰会担任评审,评审团含括... 详细信息

因疫情睽违近三年的CHAMPIONS OF TIME时间之最腕表大奖,今年终于重启,并在上海举办盛大的颁奖活动。秉持专业至上、公正中立,主办单位自五年前开始诚挚邀请来自台湾、香港与中国内地共100位专家组成钟表达人高峰会担任评审,评审团含括了国际专家、媒体记者、经销商与各地区表友代表等,并透过第三方程式进行线上投票,以确保整个投票过程公正透明。

关键词：评审团颁奖活动高峰会经销商腕表公正透明投票

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风云变幻的得奖入围名单

钟表 2023年第6期 76-91页

作者： ova 不详

华语圈年度钟表盛事:CHAMPIONS OF TIME ASIA时间之最亚洲钟表达人高峰会,本年度第15届的最终得奖即将正式揭晓,本篇文章先来预告各奖项冲上前几名的最终入围的表款究竟是哪些,以及在百位达人投票的过程中,从各奖项的排名变化所获得的... 详细信息

华语圈年度钟表盛事:CHAMPIONS OF TIME ASIA时间之最亚洲钟表达人高峰会,本年度第15届的最终得奖即将正式揭晓,本篇文章先来预告各奖项冲上前几名的最终入围的表款究竟是哪些,以及在百位达人投票的过程中,从各奖项的排名变化所获得的观察分享。CHAMPIONS OF TIME ASIA时间之最腕表大奖最初创办于2004年,以表展形式现身,在2006年正式成为一个独立的年度评选大奖,且连续举办12年不间断,而在秉持专业至上、公正中立的原则与目标下,时间之最奖项于五年前扩大规模.

关键词：高峰会入围名单 CHAMP 原则与目标奖项

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Interaction between Dairy Yeasts and Lactobacillus rhamnosus GG in Milk

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Journal of Agricultural Science and Technology 2010年第4期4卷 88-95页

作者： D. Liptakova A. Hudecova E. Valik A. Medved＇ova Department of Nutrition and Food Quality Assessment Facul~＇ of Chemical and Food Technology Slovak University of TechnologyBratislava 812 37 Slovakia

The presence of Geotrichum candidum in fresh cheese is considered to be a contaminant and may lead to the product spoilage. The oxidative yeast Candida maltosa firstly isolated from the spoiled fruit yoghurt surface in Slovakia belongs to the yeast contaminants of fermented dairy products. The effect of the cultivation temperature and the presence of Lactobacillus rhamnosus GG on the growth of dairy spoilage yeasts in ultrapasteurized milk was studied. Addition of Lb. rhamnosus GG in milk caused partial inhibition of the yeast growth dynamics in milk. The water activity transformation of Gibson model after the temperature modification （Tw） was applied to model growth dynamics of G. candidum in pure and mixed culture, respectively： In μ_Gc=-5.0376＋2.7281 Tw-0.4217Tw^2, lnμ_CC_LGG=-6.0033＋3.2996Tw-0.5553Tw^2. The effect of different Lb. rhamnosus GG addition and the incubation temperature on the C. maltosa growth dynamics was analyzed by linear regression methodology and described by using following equations： lnGr1=-5.3674＋0.2341T＋0.2599N0-0.0032T^2-0.0492N0^2-0.0068TN0 and lnGr11=-9.5457-0.249T＋2.3823N0 ＋0.0099T^2-0.2324N0^2＋0.0098TN0 Based on the principles of predictive microbiology, the mutual microbial interactions and potential application of the lactobacillus strains in food protection are discussed.

关键词： Candida maltosa Geotrichum candidum Lactobacillus rhamnosus GG mathematical modelling

LVMH WATCH WEEK 2022 4大品牌开季新表列阵

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钟表 2022年第3期 40-41页

作者： ova Chang

LVMH集团所主办的LVMH Watch Week钟表周自2019年首度登场至今,已发展成为一年一度国际钟表界的开季盛事。今年LVMH集团4大品牌:BVLGARI、HUBLOT、ZENITH及TAG HEUER联手发表今年多款最新作品。作为开年的第一场钟表大秀,LVMH Watch Wee...

LVMH集团所主办的LVMH Watch Week钟表周自2019年首度登场至今,已发展成为一年一度国际钟表界的开季盛事。今年LVMH集团4大品牌:BVLGARI、HUBLOT、ZENITH及TAG HEUER联手发表今年多款最新作品。作为开年的第一场钟表大秀,LVMH Watch Week不仅可一窥该集团的整体战略,以及各品牌未来的发展规划,某种程度更反映出新一年钟表的趋势风向。

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BVLGARI 迈入极限超薄新境界

钟表 2022年第2期53卷 36-37页

作者： ova BVLGARI 不详

宝格丽十年不只磨一剑,自2012年7月在罗马首度发表问世Octo系列并在2014年凭借着Octo Finissimo手动上链陀飞轮创下超薄纪录后,宝格丽便开始了超薄之王的登顶之路:2016年Octo Finissimo三问腕表、2017年的Octo Finissimo自动上链腕表、2... 详细信息

宝格丽十年不只磨一剑,自2012年7月在罗马首度发表问世Octo系列并在2014年凭借着Octo Finissimo手动上链陀飞轮创下超薄纪录后,宝格丽便开始了超薄之王的登顶之路:2016年Octo Finissimo三问腕表、2017年的Octo Finissimo自动上链腕表、2018年Octo Finissimo超薄自动陀飞轮、2019年Octo Finissimo自动上链计时码表、2020年Octo Finissimo镂空陀飞轮自动计时码表、2021年Octo Finissimo万年历,七项超薄世界纪录,期间,宝格丽也多次荣获日内瓦钟表大赏(GPHG)的肯定,甚至获得过最高殊荣“金指针奖”。

关键词：世界纪录万年历腕表超薄日内瓦

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色彩的力量腕表颜色大爆发

钟表 2022年第4期53卷 68-82页

作者： Bryan Lee ova Chang 不详

色彩,不仅赋予多变的视觉感受,也蕴含着观者各自的美好记忆和情感寄托。蓝色是大海也是夜空,是苏美岛那抹浅蓝大海,或是群山上闪烁着星辰的静谧夜空,星辰毫不遮掩的高挂其上;红色是火焰跳动,或是娇艳欲滴的樱桃,饱满结实;而小狐狸眼中... 详细信息

色彩,不仅赋予多变的视觉感受,也蕴含着观者各自的美好记忆和情感寄托。蓝色是大海也是夜空,是苏美岛那抹浅蓝大海,或是群山上闪烁着星辰的静谧夜空,星辰毫不遮掩的高挂其上;红色是火焰跳动,或是娇艳欲滴的樱桃,饱满结实;而小狐狸眼中的金黄色,永远是小王子飘动的发丝。

关键词：情感寄托娇艳欲滴小王子视觉感受小狐狸星辰金黄色夜空

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