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THE DErIVATIVE PATCH INTErPOLATING rECOVErY TECHNIQUE FOr FINITE ELEMENT APPrOXIMATIONS

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journal of Computational Mathematics 2004年第1期22卷 113-122页

作者： TieZhang Yan-pingLin r.j.Tait DepartmentofMathematics NortheasternUniversityShenyang110006China DepartmentofMathematics UniversityofAlbertaAlbertaCanadaT6G2G1

A derivative patch interpolating recovery technique is analyzed for the finite element approximation to the second order elliptic boundary value problems in two dimensional *** is shown that the convergence rate of the recovered gradient admits superc onvergence on the recovered subdomain, and is two order higher than the optimal global convergence rate (ultracovergence) at an internal node point when even order finite element spaces and local uniform meshes are used.

关键词： Derivative recovery Finite element Ultraconvergence

Corrosion Behavior and Hardness of Al-M (M:Mo,Si,Ti,Cr) Alloys

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Acta Metallurgica Sinica(English Letters) 2017年第4期30卷 333-341页

作者： j.Esquivel r.K.Gupta Department of Chemical and Biomolecular Engineering The University of Akron Akron OH 44325-3906 USA

The corrosion behavior of Al-5 at.% Cr, A1-5 at.% Si, Al-5 at.% Mo and Al-5 at.% Ti produced via casting and Al-5 at.% Cr produced by high-energy ball milling and subsequent consolidation by cold pressing was studied using potentiodynamic polarization and surface analysis following constant immersion tests. Alloys were characterized using a scanning electron microscope coupled with the energy-dispersive X-ray spectroscopy and X-ray diffraction analysis. Hardness, a representative of the strength, was also measured. The alloys produced by casting contained coarse intermetallics and therefore exhibited poor corrosion resistance. Al-5 at.% Cr alloy produced by high-energy ball milling exhibited a significantly improved corrosion resistance and hardness, which was attributed to the grain refinement to nanoscale and extended solid solubility of Cr in AL The study indicated that the high-energy ball milling was capable of producing Al alloys with improved corrosion behavior and hardness.

关键词： Corrosion Mechanical alloying Casting Aluminum alloys

Polymer Sensitized Quasi Solid-State Photovoltaic Cells Using Derivatives of Polythiophene

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journal of Materials Science & Technology 2006年第6期22卷 811-816页

作者： G.K.r.Senadeera j.M.r.C.Fernando Institute of Fundamental Studies Hantane RoadKandySri Lanka Institute of Fundamental Studies Hantane RoadKandySri Lanka Postgraduate Institute of ScienceUniversity of PeradeniyaPeradeniyaSri Lanka

Substituted thiophene sensitized, nanocrystalline TiO2-based quasi solid-state solar cells were fabricated by using either poly （3-thiophene acetic acid）（P3TAA） or a copolymer with poly （3-thiophene acetic acid）-poly （hexyl thiophene）（P3TAA-PHT） polymers and copper iodide （Cul） as a hole conducting material together with an ionic liquid 1-ethyl-3-methylimidazolium bis （trifluoromethylsulfonyl） amide and lithium bis （triflu- oromethanesulfone） imide as additives for charge transport promotion. Dramatic enhancements in the cell performances were observed with the additives in Cul. While the cell sensitized with P3TAA generated a short-circuit photocurrent of -1.45 ***^-2, an open-circuit photovoltage of -345 mV with a total power conversion efficiency of -0.3% under simulated full sunlight of 100 mW-cm^-2 （air mass： 1.5）, the cell sensitized with copolymer P3TAA-PHT delivered -0.25% efficiency under the same conditions with -1.23 mA-cm^-2 as photocurrent and -371 mV as photovoltage.

关键词： Solar cells Polymers Titanium dioxide

Gastroenteropancreatic neuroendocrine neoplasms:A clinical snapshot

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World journal of Gastrointestinal Surgery 2021年第3期13卷 231-255页

作者： Cornelius j fernandez Mayuri Agarwal Biju Pottakkat Nisha Nigil Haroon Annu Susan George joseph MPappachan Department of Endocrinology and Metabolism Pilgrim HospitalUnited Lincolnshire Hospitals NHS TrustBoston PE219QSUnited Kingdom Department of Surgical Gastroenterology Jawaharlal Institute of Post Graduate Medical Education and Research(JIPMER)Puducherry 605006India Department of Endocrinology and Internal Medicine Northern Ontario School of MedicineSudbury P3E 2C6OntarioCanada Department of Medical Oncology VPS Lakeshore HospitalCochin 682040KeralaIndia Department of Endocrinology and Metabolism Lancashire Teaching Hospitals NHS TrustPR29HTPrestonThe University of ManchesterOxford Road M139PLManchester Metropolitan UniversityAll Saints Building M156BHManchesterUnited Kingdom.

Our understanding about the epidemiological aspects,pathogenesis,molecular diagnosis,and targeted therapies of neuroendocrine neoplasms(NENs)have drastically advanced in the past ***(GEP)NENs originate from the enteroendocrine cells of the embryonic gut which share common endocrine and neural differentiation *** NENs are welldifferentiated,and slow *** neuroendocrine biomarkers that are used in the diagnosis of functional NENs include insulin,glucagon,vasoactive intestinal polypeptide,gastrin,somatostatin,adrenocorticotropin,growth hormone releasing hormone,parathyroid hormone-related peptide,serotonin,histamine,and 5-hydroxy indole acetic acid(5-HIAA).Biomarkers such as pancreatic polypeptide,human chorionic gonadotrophin subunits,neurotensin,ghrelin,and calcitonin are used in the diagnosis of non-functional NENs.5-HIAA levels correlate with tumour burden,prognosis and development of carcinoid heart disease and mesenteric fibrosis,however several diseases,medications and edible products can falsely elevate the 5-HIAA ***-specific transcription factors are useful in the differential diagnosis of metastasis from an unknown primary of well-differentiated *** novel biomarkers include circulating tumour cells,circulating tumour DNA,circulating micro-rNAs,and neuroendocrine neoplasms test(NETest)(simultaneous measurement of 51 neuroendocrine-specific marker genes in the peripheral blood).NETest has high sensitivity(85%-98%)and specificity(93%-97%)for the detection of gastrointestinal NENs,and is useful for monitoring treatment response,recurrence,and *** terms of management,surgery,radiofrequency ablation,symptom control with medications,chemotherapy and molecular targeted therapies are all considered as *** is the mainstay of treatment,but depends on factors including age of the individual,location,stage,grade,functional status,and the heredity of the tumour(sporadic vs inherited).Me

关键词： Gastroenteropancreatic neuroendocrine neoplasms Neuroendocrine tumours Neuroendocrine carcinoma Targeted molecular therapy Octreoscan Chemotherapy

Two examples of surfaces with normal crossing singularities

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Science China Mathematics 2011年第8期54卷 1707-1712页

作者： KOLLr jános Department of Mathematics Princeton University

This note gives two examples of surfaces with normal crossing *** the first example the canonical ring is not finitely *** the second,the canonical line bundle is not ample but its pull back to the normalization is *** latter answers in the negative a problem left unresolved in Ⅲ.2.6.2 of lments de gometrie algbrique,1961,and raised again by Viehweg.

关键词： singular surface canonical ring ampleness criteria

review of the dynamic stiffness method for free-vibration analysis of beams

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Transportation Safety and Environment 2019年第2期1卷 106-116页

作者： j.r.Banerjee Department of Mechanical Engineering and Aeronautics School of MathematicsComputer Science and EngineeringCityUniversity of LondonLondonEC1V 0HBUnited Kingdom

The application of the dynamic stiffness method(DSM)for free-vibration analysis of beams is surveyed in this *** historical development of the DSM,which has taken place in several stages,is discussed in detail with reference to the free-vibration problems of *** particular,the suitability of the DSM in solving the free-vibration problems of beams through the application of the well-known Wittrick–Williams algorithm as a solution technique is *** literature concerning homogeneous isotropic metallic beams,for which the DSM is well established,is reviewed first,after which,with the rapid and ongoing emergence of advanced composite materials,the development of the DSM in solving the free-vibration problems of anisotropic beams is *** free-vibration analysis of functionally graded beams using the DSM is also *** survey covers the DSM application for free-vibration analysis of a wide range of beams,including sandwich beams,rotating beams,twisted beams,moving beams and bending-torsion coupled beams,amongst *** aspects of the contributions made by the author and his research team are also ***,the future potential of the DSM in solving complex engineering problems is projected.

关键词： dynamic stiffness method Wittrick-Williams algorithm free-vibration analysis

Options for reducing the negative effects of nitrogen in agriculture

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Science China(Life Sciences) 2005年第z2期48卷 861-870页

作者： j.r.Freney CSIrO Plant Industry G.P.O.Box 1600 CanberraA.C.T.2601Australia

After addition to farms by fertilizer, crop residues, biological fixation and animal excreta, nitrogen can be lost through gaseous emission, runoff and leaching to contaminate the atmosphere and water bodies, and cause adverse health effects. The efficiency of fertilizer nitrogen can be increased and losses reduced, by matching supply with crop demand, optimizing split application schemes, changing the form to suit the conditions, and use of slow-release fertilizers and inhibitors. In addition, agronomic practices such as higher plant densities, weed and pest control and balanced fertilization with other nutrients can also increase efficiency of nitrogen use. Efficiency of use by animals can be increased by diet manipulation. Feeding dairy cattle low degradable protein and high starch diets, and grazing sheep and cattle on grasses high in water soluble carbohydrate result in less nitrogen excretion in urine and reduced ammonia volatilization.

关键词： options for reducing the negative effects, nitrogen in agriculture.

Optimal treatment of stratified Carreau and Casson nanofluids flows in Darcy-Forchheimer porous space over porous matrix

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Applied Mathematics and Mechanics(English Edition) 2020年第11期41卷 1651-1670页

作者： r.KUMAr r.KUMAr S.A.SHEHZAD A.j.CHAMKHA Department of Mathematics Central University of Himachal PradeshDharamshala 273001India Department of Mathematics COMSATS University IslamabadSahiwal 57000Pakistan Institute of research and Development Duy Tan UniversityDa Nang 550000Vietnam Institute of Theoretical and Applied research(ITAr) Duy Tan UniversityHanoi 100000Vietnam

A comparative three-dimensional(3D)analysis for Casson-nanofluid and Carreau-nanofluid flows due to a flat body in a magnetohydrodynamic(MHD)stratified environment is *** is estimated to be suspended in a Darcy-Forchheimer *** and Dufour responses are also accommodated in the flow field.A moving(rotating)coordinate system is exercised to examine the bidirectionally stretched flow fields(flow,heat transfer,and mass transfer).Nanofluid is compounded by taking ethylene glycol/sodium alginate as base fluid and ferric-oxide(Fe3O4)as *** equations are handled by the application of optimal homotopy asymptotic method(OHAM),where convergence parameters are optimized through the classical least square *** novel mechanism(hidden physics)due to appearing parameters is explored with the assistance of tabular and graphical *** reveal the double behavior state for temperature field with thermal stratification/Dufour number,and for concentration field with Soret number due to the presence of turning points.

关键词： thermal-solutal stratification Soret-Dufour effect Casson-Carreau nanofluid model porous matrix

Assorted soliton structures of solutions for fractional nonlinear Schrodinger types evolution equations

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journal of Ocean Engineering and Science 2022年第6期7卷 528-535页

作者： Md.Tarikul Islam Md.Ali Akbar j.F.Gómez-Aguilar E.Bonyah G.fernandez-Anaya Department of Mathematics Hajee Mohammad Danesh Science and Technology UniversityDinajpurBangladesh Department of Applied Mathematics University of RajshahiRajshahiBangladesh CONACyT-Tecnológico Nacional de México/CENIDET.Interior Internado Palmira S/N Col.PalmiraC.P.62490CuernavacaMorelosMexico Department of Mathematics Education Akenten Appiah Menka University of Skills Training and Entrepreneurial DevelopmentKumasiGhana Departamento de Física y Matemáticas.Universidad Iberoamericana C.P.01219CDMXMexico

Fractional order nonlinear evolution equations have emerged in recent times as being very important model for depicting the interior behavior of nonlinear phenomena that exist in the real *** particular,Schrodinger-type fractional nonlinear evolution equations constitute an aspect of the field of quantum *** this study,the(2+1)-dimensional time-fractional nonlinear Schrodinger equation and(1+1)-dimensional time-space fractional nonlinear Schrodinger equation are revealed as having different and novel wave *** is shown by constructing appropriate analytic wave solutions.A success-ful implementation of the advised rational(1/φ'(ξ))-expansion method generates new outcomes of the considered equations,by comparing them with those already noted in the *** the basis of the conformable fractional derivative,a composite wave variable conversion has been used to adapt the suggested equations into the differential equations with a single independent variable before applying the ***,the well-furnished outcomes are plotted in different 3D and 2D profiles for the purpose of illustrating various physical characteristics of wave *** employed technique is competent,productive and concise enough,making it feasible for future studies.

关键词： The rational(1/φ'(ξ))-expansion method Wave variable transformation Nonlinear fractional Schrodinger equation Analytic solution Soliton