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Parallel Implicit-Explicit General Linear Methods

Communications on Applied Mathematics and Computation 2021年第4期3卷 649-669页

作者： Steven Roberts arash sarshar Adrian Sandu Computational Science Laboratory Virginia Polytechnic Institute and State UniversityBlacksburgVA 24060USA

High-order discretizations of partial differential equations(PDEs)necessitate high-order time integration schemes capable of handling both stiff and nonstiff operators in an efficient ***-explicit(IMEX)integration based on general linear methods(GLMs)offers an attractive solution due to their high stage and method order,as well as excellent stability *** IMEX characteristic allows stiff terms to be treated implicitly and nonstiff terms to be efficiently integrated *** work develops two systematic approaches for the development of IMEX GLMs of arbitrary order with stages that can be solved in *** first approach is based on diagonally implicit multi-stage integration methods(DIMSIMs)of types 3 and *** second is a parallel generalization of IMEX Euler and has the interesting feature that the linear stability is independent of the order of *** experiments confirm the theoretical rates of convergence and reveal that the new schemes are more efficient than serial IMEX GLMs and IMEX Runge-Kutta methods.

关键词： Parallel Time integration IMEX methods General linear

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交流电弧炉运行产生的谐波和瞬时现象分析

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河南冶金 1997年第4期5卷 62-64页

作者： arash sarshar 孔祥彬张广清秦长海安阳钢铁集团有限责任公司安阳大学

空芯电抗器与交流电弧炉串联可作为一种预置装置,减轻炉子变压器激励所产生的瞬时负荷变化;在电炉稳定操作时也可作为阻尼电抗器,最大限度地减小闪变,稳定电弧。

关键词：电弧炉变压器谐波电抗器

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Study of Helicobacter pylori genotype status in saliva,dental plaques,stool and gastric biopsy samples

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World Journal of Gastroenterology 2012年第17期18卷 2105-2111页

作者： Hassan Momtaz Negar Souod Hossein Dabiri Meysam sarshar Department of Microbiology ShahreKord BranchIslamic Azad UniversityShahre Kord 166Iran Young Researcher's club Jahrom BranchIslamic Azad UniversityJahrom 74135-355Iran Department of Medical Microbiology School of MedicineShaheed Beheshti UniversityTehran 19835-151Iran Molecular Biology Research Center Baqiyatallah University of Medical SciencesTehran 19945-581Iran

AIM:To compare genotype of Helicobacter pylori(***) isolated from saliva,dental plaques,gastric biopsy,and stool of each patient in order to evaluate the mode of transmission of *** ***:This cross-sectional descriptive study was performed on 300 antral gastric biopsy,saliva,dental plaque and stool samples which were obtained from patients undergoing upper gastrointestinal tract endoscopy referred to endoscopy centre of Hajar hospital of Shahrekord,Iran from March 2010 to February ***,*** strains were identified by rapid urease test(RUT) and polymerase chain reaction(PCR) were applied to determine the presence of ***(ureC) and for genotyping of voculating cytotoxin gene A(vacA) and cytotoxin associated gene A(cagA) genesin each *** the data were analyzed by using statistical formulas such as Chi-square and Fisher's exact tests to find any significant relationship between these genes and patient's diseases.P < 0.05 was considered statistically significant,RESULTS:Of 300 gastric biopsy samples,77.66% were confirmed to be *** positive by PCR assay while this bacterium were detected in 10.72% of saliva,71.67% of stool *** were not able to find it in dental plaque *** prevalence of *** was 90.47% among patients with peptic ulcer disease(PUD),80% among patients with gastric cancer,and 74.13% among patients with none ulcer dyspepsia(NUD) by PCR *** evaluation of vacA and cagA genes showed 6 differences between gastric biopsy and saliva specimens and 11 differences between gastric and stool specimens.94.42% of *** positive specimens were cagA positive and all samples had amplified band both for vacA s and m *** was significant relationship between vacA s1a/m1a and PUD diseases(P = 0.04),s2/m2 genotype and NUD diseases(P = 0.05).No statically significant relationship was found between cagA status with clinical outcomes and vacA genotypes(P = 0.65).The evaluation of vacA a

关键词： Helicobacter pylori Gastric biopsy Saliva Dental plaque Stool

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