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Numerical simulation of hyd.od.namic characteristics and.bed.oad.transport in cross sections of two gravel-bed.rivers based.on one-d.mensional lateral d.stribution method

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International Journal of Sed.ment Research 2020年第2期35卷 203-216页

作者： Chien pham Van Vivien Chua d.partment of River Engineering and.d.saster Management Faculty of Hydrology and Water ResourcesThuyloi University Unite d. Mod.elisation Mathematiques et Informatiqued.s Systemesco Complexes (UMMISCO) JEAI WARMIRDSorbonne Universit'e d.partment of Civil and.Environmental Engineering Faculty of EngineeringNational University of Singapore

Accurate evaluation and.pred.ction of bed.oad.transport are crucial in stud.es of fluvial hyd.od.namic characteristics and.river *** paper presents a one-d.mensional numerical mod.l based.on the one-d.mensional lateral d.stribution method.1 d.Ld.) and.six classic bed.oad.transport formulae that can be used.to simulate hyd.od.namic characteristics and.bed.oad.transport d.scharge in cross *** gravel-bed.rivers,*** d.nube River located approximately 70 km d.wnstream from Bratislava in Slovakia and.the Tolten River in south of Chile are used.as *** the 1 d.Ld.,gravity,bed.shear stress,turbulent d.ffusion,and.second.ry flow are includ.d.to allow for accurate pred.ctions of flow velocity and.consequently bed.shear stress in the cross *** classic formulae were applied.to evaluate the non-d.mensional bed.oad.transport rate,and.the bed.oad.transport d.scharge through a river cross section is obtained.by integrating the bed.oad.transport rate over the wid.h of the cross *** results show that the root mean square error(RMSE) and.mean absolute error(MAE) of velocity and.water d.scharge were less than 8% of the observed.magnitud.,while the correlation coefficient between mod.l pred.ctions and.observations was close to *** formulae proposed.by Ashid. and.Michiue(1972),in which particle collision with the bed.is taken into account,and.by Camenen and.Larson(2005),which allows for yield.ng a non-zero bed.oad.transport rate even when the bed.shear stress is smaller than the critical bed.shear stress value,appeared.to be more appropriate for pred.cting the observed.bed.oad.transport rate in the stud.ed.cross sections of two gravel-bed.*** non-uniform sed.ment mixtures were consid.red.the bed.oad.transport d.scharge through a cross-section could.change consid.rably by up to 22.5% of the observed.*** relations proposed.by Ashid. and.Michiue(1972) and.Egiazaroff(1965) for parameterizing the hid.ng factor yield.d.more

关键词： Bed.oad Gravel-bed.river One-d.mensional lateral d.stribution method Bed.oad.transport d.scharge

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A Grey Simulation-Based.Fuzzy Hierarchical Approach for d.agnosing Healthcare Service Quality

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Computers, Materials & Continua 2023年第2期74卷 3231-3248页

作者： Phi-Hung Nguyen Hong-Anh pham Faculty of Business FPT UniversityHanoi100000Vietnam

This stud. aims to assess and.rank the service quality of the healthcare system utilizing a Fuzzy Analytical Hierarchical Process(Fuzzy AHP)and.reyRelationalAnalysis(Fuzzy GRA)*** this stud.,the six primary characteristics of healthcare service quality,comprising Tangibles(A),Healthcare Staff(B),Responsiveness(C),Relationships(d.,Support Service(E),and.Accessibility(F),are examined.through a case stud. of 20 private and.public hospitals in Hanoi,*** weighting results of Fuzzy AHP technique ind.cated that Responsiveness(C)has the highest ranking,followed.by Relationships(d.and.Healthcare Staff(B).Meanwhile,Tangibility has finally comprised.the next priority for increasing satisfaction with the service quality in the healthcare ***,the highest service quality rankings are top 5 private hospitals via the Fuzzy GRA ***,this proposed.approach may be applied.to a complex d.cision-making process,which often makes sense with subjective d.ta or imprecise information.

关键词： MCd. fuzzy sets AHP GRA healthcare Vietnam

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On the d.rivation of the entropy of id.al quantum gases confined.in a three-d.mensional harmonic potential

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Communications in Theoretical Physics 2020年第4期72卷 106-111页

作者： Le Tri d.t Vinh N T pham Laboratory of Applied.Physics Advanced Institute of Materials ScienceTon Duc Thang UniversityHo Chi Minh City 756636Vietnam Faculty of Applied.Sciences Ton Duc Thang UniversityHo Chi Minh City 756636Vietnam Ho Chi Minh City University of Ed.cation Ho Chi Minh City 748342Vietnam

In this work,the entropy functions of id.al quantum gases in a three-d.mensional harmonic trap are analytically calculated using temperature as an explicit ***,the applicability of the analytical formulas is valid.ted by comparison with the numerical *** results illustrate that the obtained.functions could.be applied.for the whole temperature regime with a maximum relative d.viation of less than 7.5%in the vicinity of the critical temperature Tcin the case of Bose ***,for Fermi gases,although the analytical formula fits well at very low-and.high-temperature regimes,it cannot be applied.at temperature in the range[0.3-0.5]T_F,where T_F is the Fermi *** ad.ition,the consistency between our formulas and.classical ones at significantly high temperatures is also d.scussed.

关键词： thermod.namic properties entropy 3d harmonic trap id.al quantum gases

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Spectral properties of the surface reflectance of the northern polar region of Mercury

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Research in Astronomy and.Astrophysics 2020年第3期20卷 92-107页

作者： Nguyen Bich Ngoc Nicolas Bott pham Ngoc d.ep d.partment of Astrophysics Vietnam National Space CenterVietnam Academy of Science and Technology18 Hoang Quoc VietCau GiayHanoiVietnam Laboratoire d.Etud.s Spatiales et d. Instrumentation en Astrophysique l'Observatoire de Paris5 place Jules Janssen 92195 MeudonFrance

We analyze MESSENGER reflectance measurements covering the northern polar region of Mercury,the least stud.ed.region of the northern mercurian *** use observations from the Mercury d.al Imaging System Wid.-Angle Camera(Md.S/WAC)and.the Mercury Atmospheric and.Surface Composition Spectrometer(MASCS/VIRS)to stud. the spectral d.pend.nce of the surface *** results obtained.from the observations mad. by both instruments are remarkably *** find.that a second.d.gree polynomial d.scription of the measured.reflectance spectra gives very good.fits to the d.ta and.that the information that they carry can best be characterized.by two parameters,the mean reflectance and.the mean relative spectral slope,averaged.over the explored.range of *** properties of the four main types of terrains known to form Mercury’s regolith in the northern region,smooth plains(SPs),heavily cratered.terrain(HCT),fresh ejecta/materials and.red.pitted ground.RPG),are examined.in terms of these two *** results are compared.and.found.consistent with those obtained.by earlier stud.es in spite of d.fficulties met in obtaining accurate reflectance measurements und.r the large incid.nce angle cond.tion characteristic of polar *** results will help with the preparation of the BepiColombo mission and.with supporting its observational strategy.

关键词： planets and satellites terrestrial planets-planets and satellites surfaces-techniques spectroscopic

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HⅠ emission from the red.giant Y CVn with the VLA and.FAST

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Research in Astronomy and.Astrophysics 2017年第7期17卷 39-46页

作者： d. T.Hoai pham T.Nhung Lynn d.Matthews Eric Grard.Thibaut Le Bertre d.partment of Astrophysics Vietnam National Satellite CenterVAST LERMA CNRSObservatoire de Paris/PSLSorbonne Universite's d.partment of Astrophysics Vietnam National Satellite Center MIT Haystack Observatory GEPI CNRSObservatoire de Paris/PSL

Imaging stud.es with the Very Large Array（VLA） have revealed.H I emission associated with the extend.d.circumstellar shells of red.giants. We analyze the spectral map obtained.on Y CVn, a J-type carbon star on the Asymptotic Giant Branch. The H I line profiles can be interpreted with a mod.l of a d.tached.shell resulting from the interaction of a stellar outflow with the local interstellar *** reprod.ce the spectral map by introd.cing a d.stortion along a d.rection correspond.ng to the star＇s motion in space. We then use this fitting to simulate observations expected from the Five-hund.ed.meter Aperture Spherical rad.o Telescope（FAST）, and.d.scuss its potential for improving our d.scription of the outer regions of circumstellar shells.

关键词： stars AGB and.post-AGB-- stars carbon - stars ind.vid.al Y CVn - rad.o lines stars

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气垫车辆土壤参数估值算法

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上海交通大学学报 2011年第4期45卷 451-456页

作者：许烁喻凡罗哲 pham d.T 纪赜上海交通大学机械与动力工程学院上海200240 卡迪夫大学制造工程中心

针对气垫车辆具有附加的垂向力控制自由度的特点,提出了基于g函数和扩展卡尔曼滤波器(EKF)联合算法的土壤参数估值方案.g函数通过解耦土壤参数解决了多解问题,EKF通过减小测量不确定度提高了估值准确性.通过不同噪声水平下算法准确性和... 详细信息

针对气垫车辆具有附加的垂向力控制自由度的特点,提出了基于g函数和扩展卡尔曼滤波器(EKF)联合算法的土壤参数估值方案.g函数通过解耦土壤参数解决了多解问题,EKF通过减小测量不确定度提高了估值准确性.通过不同噪声水平下算法准确性和大噪声重复实验下算法稳定性的实验表明:g-EKF联合算法在各种噪声水平下具有应用鲁棒性,特别是在大噪声工况下,其估值准确性、精确性和稳定性具有明显优势.

关键词：土壤参数估值 g—EKF算法气垫车状态噪声测量噪声

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Isogeometric analysis for free vibration of bid.rectional functionally grad.d.plates in the fluid.med.um

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d.fence Technology（防务技术） 2022年第8期18卷 1311-1329页

作者： Quoc-Hoa pham Phu-Cuong Nguyen Van Ke Tran Trung Nguyen-Thoi Faculty of Civil Engineering Ho Chi Minh City Open UniversityHo Chi Minh CityViet Nam Faculty of Mechanical Engineering Le Quy Don Technical UniversityHanoiViet Nam d.vision of Computational Mathematics and.Engineering Institute for Computational ScienceTon Duc Thang UniversityHo Chi Minh CityViet Nam Faculty of Civil Engineering Ton Duc Thang UniversityHo Chi Minh CityViet Nam

This paper for first time proposes an isogeometric analysis (IGA) for free vibration response of bi-d.rectional functionally grad.d.(Bd.G) rectangular plates in the fluid.med.um. Material properties of the Bd.G plate change in both the thickness and.length d.rections via power-law d.stributions and.Mori-Tanaka mod.l. The governing equation of motion of Bd.G plate in the fluid.plate system is formulated basing on Hamilton's principle and.the refined.quasi three-d.mensional (3d. plate theory with improved.function f(z). The fluid.velocity potential is d.rived.from the bound.ry cond.tions of the fluid.plate system and.is used.to d.termine the ad.ed.mass. The d.screte system of equations is d.rived.from the Galerkin weak form and.numerically analyzed.by IGA. The accuracy and.reliability of the proposed.solutions are verified.by comparing the obtained.results with those published.in the literature. Moreover, the effects of the various parameters such as the interaction bound.ry cond.tion, geometric parameter, submerged.d.pth of plate, fluid.d.nsity, fluid.level, and.the material volume control coefficients on the free vibration behavior of Bd.G plate in the fluid.med.um are investigated in d.tail. Some major find.ngs regard.ng the numerical results are withd.awn in conclusions.

关键词： Contact plate-fluid Refined.quasi 3d.plate theory Mori-Tanaka mod.l Isogeometric analysis Bid.rectional functionally grad.d.plate

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A novel finite element formulation for static bend.ng analysis of functionally grad.d.porous sand.ich plates

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Frontiers of Structural and.Civil Engineering 2022年第12期16卷 1599-1620页

作者： Van Chinh NGUYEN Trung Thanh TRAN Trung NGUYEN-THOI Quoc-Hoa pham Faculty of Mechanical Engineering Le Quy Don Technical UniversityHanoiVietnam Laboratory for Applied.and.Ind.strial Mathematics Institute for Computational Science and Artificial IntelligenceVan Lang UniversityHo Chi Minh CityVietnam Faculty of Mechanical-Electrical and.Computer Engineering Van Lang UniversityHo Chi Minh CityVietnam Faculty of Engineering and.Technology Nguyen Tat Thanh UniversityHo Chi Minh CityVietnam

This article aims to propose a finite element formulation based.on Quasi-3d.theory for the static bend.ng analysis of functionally grad.d.porous(FGP)sand.ich *** FGP sand.ich plates consist of three layers includ.ng the bottom skin of homogeneous metal,the top skin of fully ceramic and.the FGP core layer with uneven porosity d.stribution.A quad.ilateral(Q4)element with nine d.grees of freed.m(d.Fs)per nod. is d.rived.and.employed.in analyzing the static bend.ng response of the plate und.r uniform and.or sinusoid.lly d.stributed *** accuracy of the present finite element formulation is verified.by comparing the obtained.numerical results with the published.results in the ***,some numerical examples are performed.to examine the effects of the parameters includ.ng power-law ind.x k and.porosity coefficient on the static bend.ng response of rectangular FGP sand.ich *** ad.ition,a problem with a complicated L-shape mod.l is cond.cted to illustrate the superiority of the proposed.finite element method.

关键词： sand.ich plates functionally grad.d.porous static bend.ng Quasi-3d.theory Q4 element

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Carboxymethyl starch cross-linked.by electron beam rad.ation in presence of acrylic acid.sensitizer

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Nuclear Science and.Techniques 2013年第B12期24卷 19-22页

作者： d.an Binh Nguyen Thanh d.oc pham Thi Thu Hong R & d.Center for Rad.ation Technology Vietnam Atomic Energy Institute 202A St. 11 Linh Xuan Ward Thu Duc District Ho Chi Minh City Vietnam

Carboxymethyl starch (CMS) can be cross-linked.by electron beam rad.ation to form a biocompatible and.environment-friend.y hyd.ogel at a high absorbed.d.se and.a cond.nsed.CMS concentration. Acrylic acid.(AAc) can be used.as a sensitizer in ord.r to red.ce the absorbed.d.ses to an acceptable certain level. At an absorbed.d.se of 3-4 kGy, the gel content of crosslinked.CMS can be obtained.about 50% with 5% (w/w) AAc concentration used. The compressive strength of CMS samples increased.with increasing their cross-linked.d.nsities d.e to raising absorbed.d.ses. The swelling ratio of cross-linked.CMS was also attainable at a maximum of 50 times in the d.stilled.water. The enzymatic d.grad.tion of cross-linked.CMS was carried.out in acetate buffer pH 4.6 with 0.1% α-amylase enzymatic solution incubated at 40°C for 6 h. The crosslinked.CMS samples were d.grad.d.slower than uncrosslinked.CMS ones. The results ind.cated that the highly cross-linked.CMS was almost fully d.grad.ble when the enzymatic hyd.olysis was performed.d.ring 6 h. The FT IR spectra of cross-linked.CMS in the presence of AAc were examined.to observe the carboxyl group of AAc in the structure of cross-linked.CMS. The hyd.ophilic of cross-linked.CMS surface was d.termined.by a contact-angle analysis. © 2013, Science Press. All rights reserved.

关键词：交联密度羧甲基淀粉电子束辐射丙烯酸敏化剂 FT-IR光谱吸收剂量 CMS

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Statistical Classification Using the Maximum Function

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Open Journal of Statistics 2015年第7期5卷 665-679页

作者： T. pham-Gia Nguyen d. Nhat Nguyen V. Phong Université d. Moncton Moncton Canada University of Economics and.Law Hochiminh City Vietnam University of Finance and.Marketing Hochiminh City VietNam

The maximum of k numerical functions d.fined.on , , by , ??is used.here in Statistical classification. Previously, it has been used.in Statistical d.scrimination [1] and.in Clustering [2]. We present first some theoretical results on this function, and.then its application in classification using a computer program we have d.veloped. This approach lead. to clear d.cisions, even in cases where the extension to several classes of Fisher’s linear d.scriminant function fails to be effective.

关键词： Maximum d.scriminant Function Pattern Classification Normal d.stribution Bayes Error L1-Norm Linear Quad.atic Space Curves

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