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Chebyshev polynomial-based Ritz method for thermal buckling and free vibration behaviors of metal foam beams

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Applied Mathematics and Mechanics(English Edition) 2024年第5期45卷 891-910页

作者： n.D.nguyen T.n.nguyen Faculty of Civil Engineering Ho Chi Minh City University of Technology and EducationHo Chi Minh City 71309Viet Nam Faculty of Engineering and Technology Kien Giang UniversityChau Thanh 92000Viet Nam

This study presents the Chebyshev polynomials-based Ritz method to examine the thermal buckling and free vibration characteristics of metal foam *** analyses include three models for porosity distribution and two scenarios for thermal *** material properties are assessed under two conditions,i.e.,temperature dependence and temperature *** theoretical framework for the beams is based on the higher-order shear deformation theory,which incorporates shear deformations with higher-order *** governing equations are established from the Lagrange equations,and the beam displacement fields are approximated by the Chebyshev *** simulations are performed to evaluate the effects of thermal load,slenderness,boundary condition(BC),and porosity distribution on the buckling and vibration behaviors of metal foam *** findings highlight the significant influence of temperature-dependent(TD)material properties on metal foam beams'buckling and vibration responses.

关键词： Ritz method Chebyshev function buckling vibration metal foam beam higher-order beam theory(HOBT)

Some Mean Convergence Theorems for the Maximum of normed Double Sums of Banach Space Valued Random Elements

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Acta Mathematica Sinica,English Series 2024年第7期40卷 1727-1740页

作者： Andrew ROSALSKY Le Van THAnH nguyen Thi THUY Department of Statistics University of FloridaGainesvilleFL 32611-8545USA Department of Mathematics Vinh UniversityVinhNghe AnViet Nam High School for Gifted Students Vinh UniversityVinhNghe AnViet Nam

In this correspondence,we establish mean convergence theorems for the maximum of normed double sums of Banach space valued random *** of the results pertain to random elements which are *** expand and improve a number of particular cases in the literature on mean convergence of random elements in Banach *** of the main contributions of the paper is to simplify and improve a recent result of Li,Presnell,and Rosalsky[Journal of Mathematical Inequalities,16,117–126(2022)].A new maximal inequality for double sums of M-dependent random elements is proved which may be of independent *** sharpness of the results is illustrated by four examples.

关键词： Double sum mean convergence Rademacher type p Banach space Banach space valued random element M-dependent random elements

Prognostic value of n-terminal pro B-type natriuretic peptide and troponin Ⅰ in children with dengue shock syndrome

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Asian Pacific Journal of Tropical Medicine 2024年第4期17卷 166-172页

作者： Truyen Phuoc Le Phung nguyen The nguyen University of Medicine and Pharmacy at Ho Chi Minh city Ho Chi Minh CityVietnam Children's Hospital 1 Ho Chi Minh CityVietnam

Objective:To investigate the contribution of n-terminal pro B-type natriuretic peptide(nT-pro BnP)and troponin Ⅰ to mortality in children with dengue shock ***:A longitudinal study was conducted on children with dengue shock syndrome in a hospital in southern *** clinical histories,physical examinations,and laboratory parameters,including nT-pro BnP and troponin Ⅰ,were recorded.A comparison between survival and non-survival was carried out to identify factors influencing ***:A total of 107 patients with a median age of 9 years were included in the *** them,63.6%(68/107)presented with compensated shock,36.4%(39/107)had hypotensive shock,23.4%(25/107)required mechanical ventilation,and 12.1%(13/107)*** nT-pro BnP levels were 3.9 pmol/L(IQR:1.9,10.3)and 15.2 pmol/L(5.8,46.3),while the median high sensitivity troponin Ⅰ levels were 20 pg/L(6,95)and 62 pg/L(12,325)at the first and second measurements,*** mortality group exhibited higher rates of hypotensive shock,prolonged shock,lactate levels,liver damage,nT-pro BnP,and troponin Ⅰ *** shock(OR 12.96,95%CI 2.70-62.30,P=0.004),prolonged shock(OR 39.40,95%CI 6.68-232.70,P1000 IU/L(OR 9.50,95%CI 2.63-34.34,P=0.041),and nT-pro BnP>7 pmol/L(OR 44.40,95%CI 5.44-362.20,P=0.001)were identified as predictive factors for mortality in dengue shock ***:The nT-pro BnP level could serve as a potential biomarker for predicting mortality in children with dengue shock syndrome.

关键词： Dengue shock syndrome Cardiac enzyme nT-pro BnP TroponinⅠ

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中越初级汉语综合教材练习设计比较研究

中越初级汉语综合教材练习设计比较研究

作者：阮碧玉（nguyen bich ngoc）华东师范大学

学位级别：硕士

本研究对越南本土汉语教材《汉语》和中国通用汉语教材《汉语教程》与《HSK标准教程》初级阶段的练习设计进行全面的研究。同时对学生和教师进行调查与访谈,以了解学生和教师对练习设计的反馈。研究发现:(1)在练习的题量方面,《汉语》... 详细信息

本研究对越南本土汉语教材《汉语》和中国通用汉语教材《汉语教程》与《HSK标准教程》初级阶段的练习设计进行全面的研究。同时对学生和教师进行调查与访谈,以了解学生和教师对练习设计的反馈。研究发现:(1)在练习的题量方面,《汉语》的课数虽然比中国通用型教材多,但练习题量却远低于《汉语教程》和《HSK标准教程》。中国通用型教材的题量更符合越南大部分重点高中的教学进度与需求。(2)在练习的题型方面,《汉语》的题型数量最多但有些题型练习价值不高,缺乏趣味性,而且有些题型相似度较高。因此,《汉语教程》和《HSK》题型的丰富性实际上超过越南本土汉语教材。因此,越南本土汉语教材的编排模式可以在很大程度上参考中国通用型汉语教材的固定编排模式,不过需要注意在每课题型上做出一些变化。另一方面,《HSK》的练习编排设计比传统的方式更受欢迎。根据共有和特有题型的比较分析,越南本土教材《汉语》缺乏专门针对越南学生而设计的题型,而《汉语教程》和《HSK》的一些题型的设计却能有效帮助越南学生克服学习难点,满足目前的学习需求。(3)在练习内容方面,《汉语教程》和《HSK标准教程》比《汉语》的练习更能充分覆盖学习内容。中国通用型教材的练习内容在各个方面比越南本土汉语教材都更为全面。此外,《汉语》和《汉语教程》的练习设计更倾向于读写的培养,而听力和口语练习有待改进。相比之下,《HSK标准教程》更全面兼顾四项技能。(4)《汉语》和《汉语教程》在三种练习方式的题型很相似,两套教材交际性练习的互动性不如《HSK》高。总体来看,可知越南本土初级汉语综合教材的练习设计存在的问题比较多,未能充分顾及越南本土学习者的特点,而中国通用型教材的练习设计在各方面反而更能满足越南目前的教学和学习的需求,因此中国通用型教材的练习设计的思路、设计理念和题型题量等都有较多值得越南本土教材借鉴的地方。这个研究结果意味着越南新的本土教材编写至少在练习设计思路和方法方面需要做出比较大的调整。基于以上研究结果,本文提出了相应的改进建议,希望能为越南初级汉语综合教材练习设计的改善提供有益的参考和借鉴。

关键词：中越汉语综合教材初级练习设计比较研究

A concise review on surface and structural modification of porous zeolite scaffold for enhanced hydrogen storage

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Chinese Journal of Chemical Engineering 2024年第6期70卷 33-53页

作者： B.A.Abdulkadir R.S.R.Mohd Zaki A.T.Abd Wahab S.n.Miskan Anh-Tam nguyen Dai-Viet n.Vo H.D.Setiabudi Centre for Research in Advanced Fluid&Processes Universiti Malaysia Pahang Al-Sultan AbdullahLebuh Persiaran Tun Khalil YaakobGambangPahang 26300Malaysia Faculty of Chemical&Process Engineering Technology Universiti Malaysia Pahang Al-Sultan AbdullahLebuh Persiaran Tun Khalil YaakobGambangPahang 26300Malaysia Center of Excellence for Green Energy and Environmental nanomaterials(CE@GrEEn) Nguyen Tat Thanh University300A Nguyen Tat ThanhDistrict 4Ho Chi Minh City 755414Viet Nam

Investigating zeolites as hydrogen storage scaffolds is imperative due to their porous nature and favorable physicochemical ***,the storage capacity of the unmodified zeolites has been rather unsatisfactory(0.224%-1.082%(mass))compared to its modified ***,the contemporary focus on enhancing hydrogen storage capacities has led to significant attention towards the utilization of modified zeolites,with studies exploring surface modifications through physical and chemical treatments,as well as the integration of various active *** enhanced hydrogen storage properties of zeolites are attributed to the presence of aluminosilicates from alkaline and alkaline-earth metals,resulting in increased storage capacity through interactions with the charge density of these ***,there is a great demand to critically review their role such as well-defined topology,pore structure,good thermal stability,and tunable hydrophilicity in enhanced hydrogen *** article aimed to critically review the recent research findings based on modified zeolite performance for enhanced hydrogen *** of the factors affecting the hydrogen storage capacities of zeolites that can affect the rate of reaction and the stability of the adsorbent,like pressure,structure,and morphology were studied,and ***,future perspectives,recommendations,and directions for modified zeolites were discussed.

关键词： Zeolites Hydrogen storage Surface modification Adsorption Active metal

GLOBAL BOUnD On THE GRADIEnT OF SOLUTIOnS TO p-LAPLACE TYPE EQUATIOnS WITH MIXED DATA

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Acta Mathematica Scientia 2024年第4期44卷 1394-1414页

作者： Minh-Phuong TRAn The-Quang TRAn Thanh-nhan nguyen Applied Analysis Research Group Faculty of Mathematics and StatisticsTon Duc Thang UniversityHo Chi Minh CityVietnam nguyen Huu Huan High School Thu Duc CityVietnam Group of Analysis and Applied Mathematics Department of MathematicsHo Chi Minh City University of EducationVietnam

In this paper,the study of gradient regularity for solutions of a class of elliptic problems of p-Laplace type is *** particular,we prove a global result concerning Lorentz-Morrey regularity of the non-homogeneous boundary data problem:-div((s^(2)+|▽u|^(2)p-2/2)▽u)=-div(|f|^(p-2)f)+g inΩ,u=h in■Ω,with the(sub-elliptic)degeneracy condition s∈[0,1]and with mixed data f∈L^(p)(Q;R^(n)),g∈Lp/(p-1)(Ω;R^(n))for p∈(1,n).This problem naturally arises in various applications such as dynamics of non-newtonian fluid theory,electro-rheology,radiation of heat,plastic moulding and many *** on the idea of level-set inequality on fractional maximal distribution functions,it enables us to carry out a global regularity result of the solution via fractional maximal *** to the significance of M_(α)and its relation with Riesz potential,estimates via fractional maximal functions allow us to bound oscillations not only for solution but also its fractional derivatives of orderα.Our approach therefore has its own interest.

关键词： gradient estimates p-Laplace quasilinear elliptic equation fractional maximal operators Lorentz-Morrey spaces

EP Aquarii:A new Picture of the Circumstellar Envelope

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Research in Astronomy and Astrophysics 2024年第3期24卷 83-105页

作者： Pham T.nhung Do T.Hoai Pierre Darriulat Pham Tuan-Anh Pham n.Diep nguyen B.ngoc Tran T.Thai Department of Astrophysics Vietnam National Space CenterVietnam Academy of Science and Technology18Hoang Quoc VietNghia DoCau GiayHa Noivietnam

new analyses of earlier ALMA observations of oxygen-rich AGB star EP Aquarii are presented,which complete a previously published analysis and offer a different interpretation of the morpho-kinematics of the circumstellar *** birth of the equatorial density enhancement(EDE)is shown to occur very close to the star where evidence for rotation has been *** to the star and where outflows have been observed:their interaction with the gas of the nascent EDE is seen to play an important role in the development of the wind and the evolution of its radial velocity from 8 to 10 km s^(-1) on the polar symmetry axis to~2 km s^(-1) at the *** implies complex morpho-kinematics:making reliable interpretations with reasonable confidence is *** particular,it questions an earlier interpretation implying the presence of a white dwarf companion orbiting the star at an angular distance of -0″4 from its *** proposes instead an interpretation in terms of a standard mass ejection associated with a shock wave leaving a void of emission in its *** Doppler velocity wings are seen to consist of two components,the upper velocity end of the global wind,reaching above±12 km s^(-1),and an effective line broadening,confined within 200 mas from the center of the star,reaching above±20 km s^(-1) and interpreted as caused by the pattern of shock waves resulting from the interaction between stellar pulsation and convective cell partition.

关键词： stars AGB and post-AGB-(stars) circumstellar matter-radio lines stars

Storylines of family medicine Ⅱ:foundational building blocks—context,community and health

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Family Medicine and Community Health 2024年第S3期12卷 12-22页

作者： William B Ventres Leslie A Stone Rupal Shah Tamala Carter Geoffrey M Gusoff Winston Liaw bich-May nguyen Joanna V Rachelson Mary Alice Scott Teresa L Schiff-Elfalan Seiji Yamada Robert C Like Kathleen Zoppi A Peter Catinella Richard M Frankel Shailendra Prasad Family and Preventive Medicine University of Arkansas for Medical Sciences College of MedicineLittle RockArkansasUSA Bridge Lane Group Practice LondonUK Penn Center for Community Health Workers University of PennsylvaniaPhiladelphiaPennsylvaniaUSA national Clinician Scholars Program UCLA David Geffen School of MedicineLos AngelesCaliforniaUSA Health Systems and Population Health Sciences University of Houston Tilman J Fertitta Family College of MedicineHoustonTexasUSA Southern new Mexico Family Medicine Residency Program Las CrucesNew MexicoUSA new Mexico Primary Care Training Program Silver CityNew MexicoUSA Anthropology New Mexico State UniversityLas CrucesNew MexicoUSA Family Medicine and Community Health University of Hawai'i at Manoa John A Burns School of MedicineHonoluluHawaiiUSA Family Medicine and Community Health Rutgers Robert Wood Johnson Medical SchoolNew BrunswickNew JerseyUSA Family Medicine Indiana University School of MedicineIndianapolisIndianaUSA Family Medicine–Transmountain Texas Tech University Health Sciences CenterEl PasoTexasUSA Medicine Indiana University School of MedicineIndianapolisIndianaUSA Family Medicine and Community Health University of Minnesota Medical School-Twin Cities CampusMinneapolisMinnesotaUSA

Storylines of Family Medicine is a 12-part series of thematically linked mini-essays with accompanying illustrations that explore the many dimensions of family medicine,as interpreted by individual family physicians and medical educators in the USA and elsewhere around the ***‘Ⅱ:foundational building blocks—context,community and health’,authors address the following themes:‘Context—grounding family medicine in time,place and being’,‘Recentring community’,‘Community-oriented primary care’,‘Embeddedness in practice’,‘The meaning of health’,‘Disease,illness and sickness—core concepts’,‘The biopsychosocial model’,‘The biopsychosocial approach’and‘Family medicine as social medicine.’May readers grasp new implications for medical education and practice in these essays.

关键词： thematic illustration dimensions

STABILITY AnALYSIS OF A COMPUTER VIRUS PROPAGATIOn MODEL WITH AnTIDOTE In VULnERABLE SYSTEM

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Acta Mathematica Scientia 2016年第1期36卷 49-61页

作者： nguyen Huu KHAnH nguyen bich HUY Department of Mathematics College of Natural SciencesCan Tho University Departmet of Mathematics Ho Chi Minh University of Education

We study a proposed model describing the propagation of computer virus in the network with antidote in vulnerable system. Mathematical analysis shows that dynamics of the spread of computer viruses is determined by the threshold Ro. If Ro 〈 1, the virusfree equilibrium is globally asymptotically stable, and if R0 〉 1, the endemic equilibrium is globally asymptotically stable. Lyapunov functional method as well as geometric approach are used for proving the global stability of equilibria. A numerical investigation is carried out to confirm the analytical results. Through parameter analysis, some effective strategies for eliminating viruses are suggested.

关键词： computer virus virus-free equilibrium endemic equilibrium global stability antidote