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Parallel Domain Decomposition Procedures of D-D Type for Linearparabolic Integro-Dierential Equations

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Parallel Domain Decomposition Procedures of D-D Type for Lin...

作者： Emoru moses Willingtone Ingwali 华东师范大学

学位级别：硕士

线性抛物型积分微分方程常被用于生物、流体动力学、化学动力学等实际问题的数学建模中。所有这些模型反应了任何时刻、任何子域的某种特定守恒性质。在许多应用中,构造相应初边值问题的数值解的近似解法必须满足对应的守恒性质。对此... 详细信息

线性抛物型积分微分方程常被用于生物、流体动力学、化学动力学等实际问题的数学建模中。所有这些模型反应了任何时刻、任何子域的某种特定守恒性质。在许多应用中,构造相应初边值问题的数值解的近似解法必须满足对应的守恒性质。对此数学家们进行了大量的研究以找出问题的解,在此过程中出现了今天广泛使用的区域分解方法。近年来,并行区域分解方法已成为求解大规模偏微分方程系统的有力工具([2,4,5,8,10,12,15])。通过区域分解方法,复杂的整体区域被分解为若干重叠的或非重叠的子区域,其上的子问题可以通过有效或快速算法来求解,从而所有子问题可以进行并行计算。这引起了学者们极大的研究兴趣,并在工程中得到了广泛的应用。重叠型区域分解方法是工程计算中一种广泛应用的数值方法。对于椭圆问题,如今已经存在许多基于重叠型区域分解算法许多数值方法。最早的重叠型区域分解方法是施瓦茨交替方向法。通过使用希尔伯特空间的投影理论,Lions在[17]中对该算法进行了重新的解释,并证明了算法的收敛性,这对日后施瓦茨型新算法的发展是非常重要和有益的。对于抛物问题,最近提出了一种基于重叠和非重叠区域分解算法。算法是Dawson和Dupount[4]在求解如下抛物方程的时候提出的：这里,他们提出了守恒／非守恒Galerkin区域分解过程来求解抛物问题,同时也证明了问题的先验误差估计。这些过程被称为D-D型区域分解算法。其数值结果表明误差精度在L2范数下几乎是最优的。线性抛物积分微分方程解的存在性和唯一性在[15]中进行了研究, [28]对此方程的有限元方法在具有光滑核函数的情况下进行了讨论。在[5]中,羊丹平教授对D-D型抛物问题的并行区域分解算法在一般的区域的应用进行了研究,扩展D-D型算法证明Dawson和Dupount结果中的H-1/2是不存在的,改进的D-D型算法改进给出了另一种具有最优误差阶的算法。本文提出了求解线性拟抛物积分微分方程的D-D型区域分解算法,该算法将问题分解几个小的重叠或不重叠的子问题。内边界的法向导数的近似在子区域间不需要进行迭代计算。本文延拓了Dawson和Dupoint在[4]的方法,使其可以对存在积分项的方程应用良好。离散时,积分项的时间步长的范围是从第0层到第n层,因此,计算上的积分项的时间步长范围从0到n。证明中引入了相应的椭圆投影,得到了类似Dawson和Dupount的收敛性结果。

关键词：区域分解积/微分方程区域和子区域内边界

Fuzzy Fruit Fly Optimized Node Quality-Based Clustering Algorithm for Network Load Balancing

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Computer Systems Science & Engineering 2023年第2期44卷 1583-1600页

作者： P.Rahul N.Kanthimathi B.Kaarthick M.Leeban moses Department of Electronics and Communication Engineering Bannari Amman Institute of Technology Sathyamangalam638401India Department of Electronics and Communication Engineering Coimbatore Institute of Engineering and TechnologyCoimbatore641109India

Recently,the fundamental problem with Hybrid Mobile Ad-hoc Net-works(H-MANETs)is toﬁnd a suitable and secure way of balancing the load through Internet ***,the selection of the gateway and overload of the network results in packet loss and Delay(DL).For optimal performance,it is important to load balance between different *** a result,a stable load balancing procedure is implemented,which selects gateways based on Fuzzy Logic(FL)and increases the efﬁciency of the *** this case,since gate-ways are selected based on the number of nodes,the Energy Consumption(EC)was *** paper presents a novel Node Quality-based Clustering Algo-rithm(NQCA)based on Fuzzy-Genetic for Cluster Head and Gateway Selection(FGCHGS).This algorithm combines NQCA with the Improved Weighted Clus-tering Algorithm(IWCA).The NQCA algorithm divides the network into clusters based upon node priority,transmission range,and neighbourﬁ*** addition,the simulation results tend to evaluate the performance effectiveness of the FFFCHGS algorithm in terms of EC,packet loss rate(PLR),etc.

关键词： Ad-hoc load balancing H-MANET fuzzy logic system genetic algorithm node quality-based clustering algorithm improved weighted clustering fruitﬂy optimization

Combination drug treatment in patients with non-alcoholic fatty liver disease

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World Journal of Hepatology 2010年第4期2卷 139-142页

作者： Theodosios D Filippatos moses S Elisaf Department of Internal Medicine University of Ioannina Ioannina 45110 Greece

Non-alcoholic fatty liver disease (NAFLD) includes simple steatosis, a benign condition, and non-alcoholic steatohepatitis, a condition that beyond TG accumulation also includes necroinflammation and fibrosis. An association between NAFLD and cardiovascular disease (CVD) has been recently suggested. NAFLD patients usually have an increased CVD risk profile. NAFLD is also associated with metabolic syndrome (MetS) and is considered as the hepatic component of MetS by some authors. Currently, the only established treatment of NAFLD is gradual weight loss. However, multifactorial treatment of NAFLD risk factors may be needed to reduce the increased CVD risk of NALFD patients. Drug combinations that include antiobesity drugs (such as orlistat and sibutramine) and target CVD risk factors may be a good approach to NAFLD patients. Our group has investigated the orlistat-fenofibrate combination treatment in obese patients with MetS and the orlistatezetimibe and sibutramine-antihypertensive combination treatment in obese patients with hyperlipidaemia with promising results in CVD risk factor reduction and improvement of liver function tests. Small studies give promising results but double-blind, randomized trials examining the effects of such multifactorial treatment in hard CVD endpoints in NAFLD patients are missing.

关键词： Non-alcoholic fatty liver disease Non-alcoholic steatohepatitis Treatment Orlistat Sibutramine Fenofibrate Ezetimibe Weight loss

Novel voltage signal at proximity-induced superconducting transition temperature in gold nanowires

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Science China(Physics,Mechanics & Astronomy) 2018年第8期61卷 69-74页

作者： Jian Wang JunXiong Tang ZiQiao Wang Yi Sun QingFeng Sun moses H.W.Chan International Center for Quantum Materials School of PhysicsPeking UniversityBeijing 100871China Collaborative Innovation Center of Quantum Matter Beijing 100871China State Key Laboratory of Low-Dimensional Quantum Physics Department of PhysicsTsinghua UniversityBeijing 100084China Department of Physzcs The Pennsylvania State UniversityPennsylvania 16802-6300USA CAS Center for Excellence in Topological Quantum Computation University of Chinese Academy of SciencesBeijing 100190China Department of Physics University of Colorado BoulderCO 80309USA

We observed a novel voltage peak in the proximity-induced superconducting gold(Au) nanowire while cooling the sample through the superconducting transition temperature. The voltage peak turned dip during warming. The voltage peak or dip was found to originate respectively from the emergence or vanishing of the proximity-induced superconductivity in the Au *** amplitude of the voltage signal depends on the temperature scanning rate, and it cannot be detected when the temperature is changed slower than 0.03 K/min. This transient feature suggests the non-equilibrium property of the effect. Ginzburg-Landau model clarified the voltage peak by considering the emergence of Cooper pairs of relatively lower free energy in superconducting W contact and the non-equilibrium diffusion of Cooper pairs and quasiparticles.

关键词： proximity-induced superconductivity Au nanowire non-equilibrium process

Bifunctional S-scheme hybrid heterojunction comprising CdS nanorods and BiOIO_(3) nanosheets for efficient solar-induced antibiotic degradation and highly-selective CO_(2) reduction

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Journal of Materials Science & Technology 2023年第30期161卷 74-87页

作者： Dong-Eun Lee Naresh Mameda Kasala Prabhakar Reddy B.moses Abraham Wan-Kuen Jo Surendar Tonda School of Architecture CivilEnvironmental and Energy EngineeringKyungpook National University80 Daehak-roBuk-guDaegu 41566South Korea Department of Chemistry Koneru Lakshmaiah Education FoundationVaddeswaramGunturAndhra Pradesh 522302India Department of Chemistry and Biochemistry University of South Carolina631 Sumter StreetColumbiaSC 29208United States Department of Chemical Engineering Indian Institute of Technology KanpurKanpur 208016India

The development of a bifunctional photocatalyst that can be utilized for both energy conversion and envi-ronmental remediation is of great practical *** addition,an S-scheme charge transfer process can assist a photocatalyst in efficiently separating photoexcited electrons and holes while maintaining the strong reducibility and oxidizability of the former and the latter,*** developed a bifunctional S-scheme hybrid photocatalyst comprising CdS nanorods and BiOIO_(3)(BIO) nanosheets for efficient antibi-otic degradation and cocatalyst-and sacrificial reagent-free CO_(2) *** combination of visible-light-responsive one-dimensional(1D)CdS and UV-light-responsive 2D BIO resulted in a CdS/BIO hybrid photocatalyst with effective 1D/2D(line)interfacial contact and a broadened optical absorption ***,the CdS/BIO hybrid exhibited exceptional diclofenac degradation and mineralization as well as outstanding CO_(2) reduction activity for CO production,with 95.4%CO selectivity over H_(2)*** exceptional performance of the hybrid catalyst is primarily attributed to the accelerated photoexcited charge transfer caused by the 1D/2D line interfacial contact and the high charge separation and strong redox power of the separated charges,both of which stem from the effective S-scheme charge transfer *** addition,photocorrosion of CdS was substantially mitigated,resulting in the high photocat-alytic performance of the hybrid catalyst even after repeated test *** study provides insight into the rational design of bifunctional S-scheme hybrid photocatalysts for CO_(2) reduction and pollutant degra-dation.

关键词： CdS BiOIO_(3) Bifunctional photocatalyst S-scheme mechanism Antibiotic degradation CO_(2)reduction

A Comparative Study of Groundwater between Geological Groups of Southern Benue Trough,Nigeria Using Modelling Approach

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Journal of Environmental & Earth Sciences 2021年第2期3卷 72-86页

作者： moses Oghenenyoreme Eyankware Philip Njoku Obasi Christoper Ogwah Department of Geology Ebonyi State UniversityEbonyi StateNigeria Geomoses Consultancy Limited Warri Delta StateNigeria

Groundwater studies were carried out between two geological groups to evaluate factors that influences groundwater *** achieve this,30 groundwater samples were *** such as pH,Electrical Conductivity(Ec),Total Dissolved Solids(TDS),Total Hardness(TH),and hydrochemical characteristics(Na^(2+),K^(+),Ca^(2+),Mg^(2+),HCO_(3)^(¯),NO_(3)^(¯),Cl^(¯),CO_(2)^(3¯),and SO_(4)^(2¯))of groundwater were *** revealed that the pH value for Asu River Group ranges from 5.3 to 7.5,and that of Eze Aku Group ranges from 4.1 to *** was observed that areas around the mines had low pH *** results that were obtained were interpreted using various hydrogeochemical *** plots reflected that groundwater within the two geological groups fell within Ca˗Mg˗SO_(4) and Ca˗Mg˗*** from End˗member plots showed that 96%of groundwater samples analyzed were categorized under carbonate weathering,4%fell silicate *** plots revealed that interactions between groundwater and surrounding host rocks are mostly the main processes responsible for chemical characteristics of groundwater,Diamond field plots suggested that groundwater within the study were categorized to be high in Ca+Mg&SO_(4)+Cl,the plot of Ca^(2+)/(HCO_(3)^(¯)+SO_(4)^(2¯))against Na^(+)/Cl^(¯)revealed that groundwater was considered to be within the natural state for the two *** plot of TDS against TH showed that groundwater is classified as soft *** study revealed there was no significant difference between factors that influence groundwater within the two geological.

关键词： Weathering Ion exchange Group Groundwater Nigeria

Physio-chemical interaction of Ethylene-Vinyl Acetate copolymer on bonding ability in the cementing material used for oil and gas well

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Petroleum Research 2022年第3期7卷 341-349页

作者： Sai Teja Lanka Niclas Galih Anak moses Raja Rajeswary Suppiah Belladonna Troxylon Maulianda Universiti Teknologi PETRONAS Seri IskandarPerak32610Malaysia PTPERTAMINA(Persero) Jakarta10110Indonesia

Effective bond of cement sheath to casing or formation depends on higher tensile strength and lower young's modulus which are a measure of its ability to withstand deformation under load without *** work utilized Ethylene Vinyl Acetate(EVA)redispersible polymer powder as additive in the class G cement to characterize bonding *** strength was measured for samples cured at 90°C for 3 days,whereas compressive strength was measured for samples cured at 120°C for 1 day and 3 days under atmospheric *** results showed that,with the addition of beyond 10% by weight of cement(BWOC)of polymer,not only tensile strength was improved,but also reduced young's *** of EVA additive beyond 10% BWOC showed significant benefit of flexibility in the cement ***(Fourier Transform Infrared Spectroscopy)indicated that presence of high VA(Vinyl Acetate)has no effect on polymerization of Silicates,which shows it does not hider in the formation of C–S–H *** of chemical bond augmented with longer curing time and increased polymer content,as seen in O–H stretching vibration at 3434 cm^(−1) and from Carboxylate anion at 1571 cm^(−1) to confirm on *** Intrusion porosimeter(MIP)showed significant reduction in fraction of mesopore sizes within the cement matrix,with the polymer addition.

关键词： Well cementing EVA-Modified cement Flexibility Infrared spectroscopy Pore size distribution

Current role of fenofibrate in the prevention and management of non-alcoholic fatty liver disease

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World Journal of Hepatology 2013年第9期5卷 470-478页

作者： Michael S Kostapanos Anastazia Kei moses S Elisaf Department of Internal Medicine School of MedicineUniversity of Ioannina45110 IoanninaGreece

Non-alcoholic fatty liver disease(NAFLD) is a common health problem with a high mortality burden due to its liver- and vascular-specific complications. It is associated with obesity, high-fat diet as well as with type 2 diabetes mellitus(T2DM) and metabolic syndrome(MetS).Impaired hepatic fatty acid(FA) turnover together with insulin resistance are key players in NAFLD pathogenesis. Peroxisome proliferator-activated receptors(PPARs)are involved in lipid and glucose metabolic *** novel concept is that the activation of the PPARαsubunit may protect from liver steatosis. Fenofibrate, by activating PPARα, effectively improves the atherogenic lipid profile associated with T2DM and MetS. Experimental evidence suggested various protective effects of the drug against liver steatosis. Namely, fenofibraterelated PPARα activation may enhance the expression of genes promoting hepatic FA β-oxidation. Furthermore, fenofibrate reduces hepatic insulin resistance. It also inhibits the expression of inflammatory mediators involved in non-alcoholic steatohepatitis *** include tumor necrosis factor-α, intercellular cell adhesion molecule-1, vascular cell adhesion molecule-1and monocyte chemoattractant protein-1. Consequently, fenofibrate can limit hepatic macrophage infiltration. Other liver-protective effects include decreased oxidative stress and improved liver microvasculature function. Experimental studies showed that fenofibrate can limit liver steatosis associated with high-fat diet,T2DM and obesity-related insulin resistance. Few studies showed that these benefits are also relevant even in the clinical setting. However, these have certain limitations. Namely, these were uncontrolled, their sample size was small, fenofibrate was used as a part of multifactorial approach, while histological data were *** this context, there is a need for large prospective studies, including proper control groups and full assessment of liver histology.

关键词： Fenofibrate Non-alcoholic fatty liver disease Steatohepatitis Peroxisome proliferator-activated receptors

Dominant factors in MiniCone, CPT and pile correlations: A data‐based approach

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Deep Underground Science and Engineering 2023年第4期2卷 346-358页

作者： Seyed Sajad Shirani Abolfazl Eslami Amirhossein Ebrahimipour moses Karakouzian Department of Civil and Environmental Engineering Amirkabir University of Technology(AUT)(Tehran Polytechnic)TehranIran University of California San Diego San DiegoCaliforniaUSA Department of Civil and Environmental Engineering and Construction University of NevadaLas VegasNevadaUSA

The cone penetration test(CPT)contributes to the design and analysis of piles regarding geometry,installation effect,and pile capacity(shaft and toe resistance).MiniCone,as an alternative to CPT sounding,has been used to carry outﬁeld and laboratory investigations by physical *** tests can be practically carried out through light equipment and small soil mass,involving fewer errors caused by boundary ***,it can be used for in situ testing,such as quality control,assessment of ground improvement,and subgrade characterization.A database comprising MiniCone and CPT records inﬁeld and physical modeling is proposed with a variety of cone *** case study records in the database have been obtained from 140 tests compiled from data from 26 *** sources include the results of 20 physical modelings andﬁeld data from six sites in 10 *** data comprise MiniCone and CPT cone tip resistance(qc),and sleeve friction(fs).The different cones are used in sandy,silty sand,and clayey soils via simple chambers(1 g),calibration chambers,and frustum conﬁning *** addition,correlations were found in penetration records in terms of physical modeling types,cone diameters,penetration rates,and soil ***,qc and fs are related to capacities of pile toes and shafts using proper correlation coefﬁcients less than unity,*** and dominant factors in geotechnical practice between MiniCone,CPT,and pile have been reviewed and discussed.

关键词： correlations CPT database dominant factors MiniCone pile