检索结果-南通市图书馆

UNIFORM SUPERCONVERGENCE OF A FINITE ELEMENT METHOD WITH EDGE STABILIZATION FOR CONVECTION-DIFFUSION PROBLEMS

在线全文

学校读者我要写书评

暂无评论

Journal of Computational Mathematics 2010年第1期28卷 32-44页

作者： sebastian franz Torsten Linβ Hans-Grg Roos sebastian Schiller Department of Mathematics and Statistics University of Limerick Institut für Numerische Mathematik Technische Universitt Dresden

In the present paper the edge stabilization technique is applied to a convection-diffusion problem with exponential boundary layers on the unit square, using a Shishkin mesh with bilinear finite elements in the layer regions and linear elements on the coarse part of the mesh. An error bound is proved for ‖πu-u^h‖Е, where πu is some interpolant of the solution u and uh the discrete solution. This supercloseness result implies an optimal error estimate with respect to the L2 norm and opens the door to the application of postprocessing for improving the discrete solution.

关键词： Convection-diffusion problems Edge stabilization FEM Uniform convergence Shishkin mesh.

Superconvergence of a Galerkin FEM for Higher-Order Elements in Convection-Diffusion Problems

在线全文

学校读者我要写书评

暂无评论

Numerical Mathematics(Theory,Methods and Applications) 2014年第3期7卷 356-373页

作者： sebastian franz H.-G.Roos Institut für Numerische Mathematik Technische Universit¨at Dresden01062 DresdenGermany

In this paper we present a first supercloseness analysis for higher-order Galerkin FEM applied to a singularly perturbed convection-diffusion *** a solution decomposition and a special representation of our finite element space,we are able to prove a supercloseness property of p+1/4 in the energy norm where the polynomial order p≥3 is odd.

关键词： Singular perturbation layer-adapted meshes superconvergence postprocessing

Resilience in Agriculture: Communication and Energy Infrastructure Dependencies of German Farmers

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

International Journal of Disaster Risk Science 2022年第2期13卷 214-229页

作者： franz Kuntke sebastian Linsner Enno Steinbrink Jonas Franken Christian Reuter Science and Technology for Peace and Security(PEASEC) Technical University of Darmstadt64289 Darmstadt.HesseGermany

Agriculture is subject to high demands regarding resilience as it is an essential component of the food production chain. In the agricultural sector, there is an increasing usage of digital tools that rely on communication and energy infrastructures. Should disruption occur,such strengthened dependencies on other infrastructures increase the probability of ripple effects. Thus, there is a need to analyze the resilience of the agricultural sector with a specific focus on the effects of digitalization. This study works out resilience capacities of the interconnected technologies used in farm systems based on the experiences and opinions of farmers. Information was gathered through focus group interviews with farmers(N = 52) and a survey with participants from the agricultural sector(N =118). In particular, the focus is put on the digital tools and other information and communication technologies they use. Based on a definition of resilience capacities, we evaluate resilience regarding energy and communication demands in various types of farm systems. Especially important are the resilience aspects of modern systems’ digital communication as well as the poorly developed and nonresilient network infrastructure in rural areas that contrast with the claim for a resilient agriculture. The result is a low robustness capacity, as our analysis concludes with the risk of food production losses.

关键词： Digitalization of agriculture Germany Infrastructure failures Resilience capacities

Proteome alterations in aqueous humour of primary open angle glaucoma patients

在线全文

学校读者我要写书评

暂无评论

International Journal of Ophthalmology(English edition) 2020年第1期13卷 176-179页

作者： Hanhan Liu Fabian Anders sebastian Funke Karl Mercieca franz Grus Verena Prokosch Department of Ophthalmology University Medical Center of the Johannes Gutenberg University MainzMainz 55131Germany Experimental and Translational Ophthalmology Department of OphthalmologyUniversity Medical Center of the Johannes Gutenberg University MainzMainz 55131Germany Royal Eye Hospital School of MedicineUniversity of ManchesterManchester M202ULUnited Kingdom

AIM: To unravel the primary open angle glaucoma(POAG) related proteomic changes in aqueous humour(AH).METHODS: Totally 35 patients listed for cataract surgery(controls: n=12, age: 67.4±13.6 y) or trabeculectomy for POAG(n=23, age: 72.5±8.3 y) were included. AH samples of those patients were obtained during cataract surgery or trabeculectomy. AH samples were subsequently pooled into the experimental groups under equal contribution in terms of protein amount of each individual patient. Protein samples were analyzed by a linear trap quadrupol Orbitrap Mass Spectrometry device with an upstream liquid chromatography system. The obtained raw data were analyzed using the Maxquant proteome software and compared. Proteins with a fold-change ratio higher than a cut-off of 2 were considered as noticeably ***: A total number of 175 proteins could be identified out of the AH from POAG and cataract by means of quantitative mass spectrometric analysis. Apolipoprotein D(fold change, 3.16 times), complement C3(2.96), pigment epithelium-derived factor(2.86), dickkopf-related protein 3(2.18) and wingless-related integration(Wnt) inhibitory factor 1(2.35) were significantly upregulated within the AH of glaucoma compared to cataract serving as ***: AH provides a tool to analyze changes in glaucoma and shows striking changes in Wnt signaling inhibitory molecules and other proteins.

关键词： primary open angle glaucoma aqueous humor proteomics Wnt signaling pathway

Digital templating in total hip arthroplasty:Additional anteroposterior hip view increases the accuracy

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

World Journal of Orthopedics 2017年第1期8卷 30-35页

作者： Sophia K Stigler franz J Müller sebastian Pfaud Michael Zellner Bernd Füchtmeier Clinic for Trauma Orthopaedic and Sports MedicineHospital Barmherzige Brüder

AIM To analyze planning total hip arthroplasty(THA) with an additional anteroposterior hip view may increases the accuracy of preoperative planning in *** We conducted prospective digital planning in 100 consecutive patients: 50 of these procedures were planned using pelvic overview only(first group), and the other 50 procedures were planned using pelvic overview plus antero-posterior(a.p.) hip view(second group). The planning and the procedure of each patient were performed exclusively by the senior surgeon. Fifty procedures with retrospective analogues planning were used as the control group(group zero). After the procedure, the planning was compared with the eventually implanted components(cup and stem). For statistic analysis the x^2 test was used for nominal variables and the t test was used for a comparison of continuous *** Preoperative planning with an additional a.p. hip view(second group) significantly increased the exact component correlation when compared to pelvic overview only(first group) for both the acetabular cup and the femoral stem(76% cup and 66% stem vs 54% cup and 32% stem). When considering planning ± 1 size, the accuracy in the second group was 96%(48 of 50 patients) for the cup and 94% for the stem(47 of 50patients). In the analogue control group(group zero), an exact correlation was observed in only 1/3 of the *** Digital THA planning performed by the operating surgeon and based on additional a.p. hip view significantly increases the correlation between preoperative planning and eventual implant sizes.

关键词： Digital Templating Preoperative planning Hip view Total hip arthroplasty

The German Energiewende and its roll-out of renewableenergies： An economic perspective

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

Frontiers in Energy 2017年第2期11卷 126-134页

作者： sebastian KREUZ Felix MUSGENS Faculty of Mechanical Engineering Electrical and Energy SystemsBrandenburg University of Technology 03046 Cottbus Germany

This paper gives a short overview of the German Energiewende, i.e. the transition of a large and mostly thermal electricity system towards electricity generation from renewable energy source. It discusses both, the motivation of the transitions as future goals and current status. Furthermore, it gives an in-depth view into the changes in economic costs for society as well as electricity price effects, especially for average private households and industrial consumers. It also discusses the benefits of the promotion of renewable energies in Germany.

关键词： electricity system renewable energy cost-benefit analysis

Influence of Non-Uniform Temperature Distribution on Metallic Charge Length on Energy and Force Parameters During Groove-Rolling

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

Journal of Iron and Steel Research International 2012年第8期19卷 17-24页

作者： Mróz sebastian Czestochowa University of Technology

Change in the temperature of band over its length, associated with the stock being non-uniformly heated in the furnace, influences the variations in the magnitudes of energy-force parameters. Using the FEM (Finite Element Model) programs for the computation of the values of the energy-force parameters can take into account the distribution of temperature over the band length. The mathematical model of the computer program Forge2008 was used to theoretically examine the energy-force parameters and plastic metal flow in the roughing stands of the continuous rolling mill. The results of experimental investigation of influence of the non-uniform temperature distribution were presented on the metallic charge length on the energy and force parameters and dimensions of the band during round bars rolling. Thermovision monitoring energy and force parameters monitoring were carried out in continuous rolling mill D350 in one of the Polish industrial plants. On the basis of obtained results, it could be stated that non-uniform distribution of temperatures along the charge length causes local increase of energy and force parameters values and also such distribution affects the local increase of the width of rolled band. The rolling process of charge with non-uniform distribution of temperature could lead to exceeding required dimensional tolerances of the final products.

关键词： groove-rolling energy parameter force parameter numerical technique FEM

Towards a Local-Level Resilience Composite Index: Introducing Different Degrees of Indicator Quantification

在线全文

学校读者我要写书评

暂无评论

International Journal of Disaster Risk Science 2017年第1期8卷 91-99页

作者： sebastian Jlich Regional Economics and Development Economics and Social SciencesSwiss Federal Research Institute WSL8903 BirmensdorfSwitzerland

Within disaster resilience research there is a trend of developing quantitative metrics for resilience analysis. Quantitative indicators can be useful for decision makers in the field of resilience building to prioritize preventive actions to target the least resilient. This study explores possibilities and constraints in quantifying disaster resilience at the local level. While national or regionallevel indicators mostly employ existing secondary source data, at the local level it is necessary to collect new data in most cases. The main aim of this study is to investigate how resilience indicators with different stages of operationalization can be developed at the local level. Using the example of the Swiss canton of Grisons, three local-level partial indicators for community resilience against natural hazard are developed. In this process qualitative research is the necessary basis to construct quantitative indicators. For each partial indicator different stages of quantification are offered to illustrate how quantitatively operationalized indicators can be developed and to examine their strengths and weaknesses. For this purpose a classification of different indicator operationalization stages is proposed,ranging from vague qualitative criteria to fully quantified criteria.

关键词： Disaster resilience Indicator development Resilience index Risk and loss perception Switzerland

Defense and anti-defense mechanisms of bacteria and bacteriophages

在线全文

学校读者我要写书评

暂无评论

Journal of Zhejiang University-Science B(Biomedicine & Biotechnology) 2024年第3期25卷 181-196页

作者： Xiaoqing WANG sebastian LEPTIHN School of Medicine Lishui UniversityLishui 323000China University of Edinburgh Medical School Biomedical SciencesCollege of Medicine&Veterinary MedicineThe University of EdinburghEdinburgh EH89JZUK HMU Health and Medical University Am Anger 64/73-99084 ErfurtGermany

In the post-antibiotic era,the overuse of antimicrobials has led to a massive increase in antimicrobial resistance,leaving medical doctors few or no treatment options to fight infections caused by *** use of bacteriophages is a promising alternative to treat infections,supplementing or possibly even replacing *** phages for therapy is possible,since these bacterial viruses can kill bacteria specifically,causing no harm to the normal ***,bacteria have developed a multitude of sophisticated and complex ways to resist infection by phages,including abortive infection and the clustered regularly interspersed short palindromic repeats(CRISPR)/CRISPR-associated(Cas)*** also can evolve and acquire new anti-defense strategies to continue *** in-depth exploration of both defense and anti-defense mechanisms would contribute to optimizing phage therapy,while we would also gain novel insights into the microbial *** this paper,we summarize recent research on bacterial phage resistance and phage anti-defense mechanisms,as well as collaborative win-win systems involving both virus and host.

关键词： Bacteriophage Phage resistance Abortive infection Phage therapy