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Evaluating physical changes of iron oxide nanoparticles due to surface modification with oleic acid

Chinese Physics B 2020年第10期29卷 186-194页

作者： S Rosales N Casillas A Topete O Cervantes g gonzález j A Paz m E Cano Centro Universitario de Ciencias Exactas e Ingenienas Universidad de GuadalajaraBlvd.Marcelino Garcia Burragan 1421C.P.44430GuadalajaraJaliscoMexico Centro Universitario de la Cienegu Universidad de GuadalajaraAv.Universidad 1115C.P.47820OcotlanJaliscoMexico Centro Universitario de Ciencias de In Salud Universidad de Guadalajara.Sierra Mojada 950C.P.44340GuadalajaraJaliscoMexico

The physical characterization of a colloidal system of superficially modified m.g.etic nanoparticles (mNPs) is presented. The system consists of oleic acid-coated iron oxide nanoparticles (OAmNP) suspended in water. A structural analysis is carried out by using standard physical techniques to determine the diameter and shape of the mNPs and also the width of the coating shell. The colloidal stability and the polydispersity index of this ferrofluid are determined by using Zeta potential measurements. Additionally, the m.g.etic characterization is conducted by obtaining the DC m.g.etization loops, and the blocking temperatures are determined according to the ZFC–FC protocol. Finally, the values of power absorption density P of the ferrofluid are estimated by using a m.g.eto-calorimetric procedure in a wide range of m.g.etic field amplitude H and frequency f. The experimental results exhibit spherical-like shape of OAmNP with (20 ± 4) nm in diameter. Due to the use of coating process, the parameters of the m.g.etization loops and the blocking temperatures are significantly modified. Hence, while the uncoated mNPs show a blocking state of the m.g.etization, the OAmNP are superparam.g.etic above room temperature (300 K). Furthermore, the reached dependence P versus f and P versus H of the ferrofluid with coated mNPs are clearly fitted to linear and quadratic correlations, respectively, showing their accordance with the linear response theory.

关键词： nanoparticles ferrofluid m.g.etic hyperthermia functionalization

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Identity, Traditions and Lack of Environmental Behaviour

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journal of Environmental Science and Engineering 2011年第3期5卷 365-380页

作者： C. Arcidiacono F. Procentese m.g. Paolillo Incoparde Laboratory Department of Relational Sciences Federico II University of Naples

Place memories （traditions）, transmitted through art and the stories of a community, are key elements for the construction of individual and collective identity, connected to specific places. In this regard the authors examined how the representation of traditions affects place identity and in what ways the cultural heritage of the town m.g.t influence environmental forms of behaviour such as plans and projects. To this end the authors investigated the small town of Pagani in southern Italy, which has many ancient cultural traditions linked to specific locations and their rituals such as the festival of Our Lady of the Hens. Our contribution favours a qualitative approach in examining the data gathered and a participative methodology. The statistical analysis of the vocabulary distribution within 83 texts concerning town and its traditions, written by local citizens （52% male and 48% female） of different ages （range： 18-78） revealed a strong place identity. Narrative interviews （14） with key people were then analysed by means of grounded theory. In the perspective of conservation psychology the authors finally focussed on how feelings of impotence and social distrust influence relations between citizens and their local environment.

关键词： Traditions place identity place attachment environmental behaviour community trust.

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guided Waves in the multilayered One-Dimensional Hexagonal Quasi-crystal Plates

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Acta mechanica Solida Sinica 2021年第1期34卷 91-103页

作者： B.Zhang j.g.Yu X.m.Zhang X.H.Wang School of mechanical and Power Engineering Henan Polytechnic UniversityJiaozuo454003China

guided waves in the multilayered one-dimensional quasi-crystal plates are,respectively,investigated in the context of the Bak and elasto-hydrodynamic *** curves and phonon and phason displacements are calculated using the Legendre polynomial *** characteristics in the context of these two models are analyzed in *** show that the phonon-phason coupling effects on the first two layers are the same at low frequencies;but,they are more significant on the first layer than those on the second layer at high *** obtained results lay the theoretical basis of guided-wave nondestructive test on multilayered quasi-crystal plates.

关键词： multilayered structures Quasi-crystal plate guided wave Phonon-phason coupling effect

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Supposition of graphene stacks to estimate the contact resistance and conductivity of nanocomposites

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Applied mathematics and mechanics(English Edition) 2024年第4期45卷 663-676页

作者： Y.ZARE m.T.mUNIR g.j.WENg K.Y.RHEE Biomaterials and Tissue Engineering Research group Department of Interdisciplinary TechnologiesBreast Cancer Research CenterMotamed Cancer InstituteTehran ***Iran College of Engineering and Technology American University of the Middle EastEgaila 54200Kuwait Department of mechanical and Aerospace Engineering Rutgers UniversityNew BrunswickNJ 08903U.S.A. Department of mechanical Engineering(BK21 Four) College of EngineeringKyung Hee UniversityYongin 446701Republic of Korea

In this study,the effects of stacked nanosheets and the surrounding interphase zone on the resistance of the contact region between nanosheets and the tunneling conductivity of samples are evaluated with developed equations superior to those previously *** contact resistance and nanocomposite conductivity are modeled by several influencing factors,including stack properties,interphase depth,tunneling size,and contact *** developed model's accuracy is verified through numerous experimental *** further validate the models and establish correlations between parameters,the effects of all the variables on contact resistance and nanocomposite conductivity are ***,the contact resistance is primarily dependent on the polymer tunnel resistivity,contact area,and tunneling *** dimensions of the graphene nanosheets significantly influence the conductivity,which ranges from 0 S/m to90 S/*** increased number of nanosheets in stacks and a larger gap between them enhance the nanocomposite's ***,the thicker interphase and smaller tunneling size can lead to higher sample conductivity due to their optimistic effects on the percolation threshold and network efficacy.

关键词： graphene polymer composite stacked nanosheet tunneling conductivity contact resistance interphase

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Harnessing memory adaptive regulatory T cells to control autoimmunity in type 1 diabetes

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journal of molecular Cell Biology 2012年第1期4卷 38-47页

作者： Cheng-Rui Li Bas j.g.Baaten Linda m.Bradley Infectious and Inflammatory Disease Center Sanford-Burnham Medical Research Institute10901 North Torrey Pines RoadLa JollaCA 92037USA

Type 1 diabetes(T1D)results from autoimmune destruction of insulin-producing b-cells in the pancreatic *** is an immediate need to restore both b-cell function and immune tolerance to control disease progression and ultimately cure ***,there is no effective treatment strategy to restore glucose regulation in patients with ***3-expressing CD4^(+) regulatory T cells(Tregs)are potential candidates to control autoimmunity because they play a central role in maintaining ***,deficiencies in either naturally occurring Tregs(nTregs)themselves and/or their ability to control pathogenic effector T cells have been associated with ***,we hypothesize that nTregs can be replaced by FoxP3^(+) adaptive Tregs(aTregs),which are uniquely equipped to combat autoreactivity in *** nTregs,aTregs are stable and provide long-lived *** this review,we summarize the current understanding of aTregs and their potential for use as an immunological intervention to treat T1D.

关键词： type 1 diabetes adaptive regulatory T cells autoimmunity immunotherapy

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A matrix-Vector Operation-Based Numerical Solution method for Linear m-th Order Ordinary Differential Equations:Application to Engineering Problems

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Advances in Applied mathematics and mechanics 2013年第3期5卷 269-308页

作者： m.Aminbaghai m.Dorn j.Eberhardsteiner B.Pichler Institute for mechanics of materials and Structures Vienna University of Technology(TU Wien)Karlsplatz 13/202A-1040 ViennaAustria Linnaeus University Department of Building and Energy TechnologyL¨uckligs Plats 1S-35195 V¨axj¨oSweden

many problems in engineering sciences can be described by linear,inhom.g.neous,m-th order ordinary differential equations(ODEs)with variable *** this wide class of problems,we here present a new,simple,flexible,and robust solution method,based on piecewise exact integration of local approximation polynomials as well as on averaging local *** method is designed for modern mathematical software providing efficient environments for numerical matrix-vector operation-based *** on cubic approximation polynomials,the presented method can be expected to perform(i)similar to the Runge-Kutta method,when applied to stiff initial value problems,and(ii)significantly better than the finite difference method,when applied to boundary value ***,we use the presented method for the analysis of engineering problems including the oscillation of a modulated torsional spring pendulum,steady-state heat transfer through a cooling web,and the structural analysis of a slender tower based on second-order beam *** convergence studies provide insight into the satisfying characteristics of the proposed solution scheme.

关键词： Numerical integration polynomial approximation ODE variable coefficients initial conditions boundary conditions stiff equation

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一只笑不停的狼

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2019年

作者： (荷)安妮·m.g.施密特

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Orbital and physical parameters of the close binary system.g. 9830(HIP 116259)

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Research in Astronomy and Astrophysics 2019年第7期19卷 163-172页

作者： Suhail g.masda mashhoor A.Al-Wardat j.m.Pathan Physics Department Dr.Babasaheb Ambedkar Marathwada UniversityAurangabad-431001MaharashtraIndia Physics Department Hadhramout UniversityPO Box: 50511MukallaYemen Physics Department Al al-Bayt UniversityPO Box: 130040Mafraq25113 Jordan Physics Department Maulana Azad CollegeAurangabad-431001MaharashtraIndia

We present the complete set of physical and geometrical parameters of the visual close binary system.g. 9830 for the first time by applying Al-Wardat’s complex *** method combines m.g.itude difference from speckle interferometry,synthetic spectral energy distributions of the binary components which are constructed based on grids of Kurucz blanketed models(ATLAS9),and the orbital solution using Tokovinin’s dynamical method to estimate the parameters of individual *** analysis of the system by employing synthetic photometry resulted in the following set of parameters:Teff= 6220 ± 100 K,log g = 4.30 ± 0.12,R = 1.10 ± 0.08 R⊙for the primary component and Teff= 4870 ± 100 K,log g = 4.60 ± 0.11,R = 0.709 ± 0.07 R⊙for the secondary *** recently published dynamical parallax from the gaia space mission was used to calculate the total mass of the binary system as 1.75 ± 0.06 m⊙,which coincides with those estimated using Al-Wardat’s method as mA= 1.18 ± 0.10 m⊙,mB= 0.75 ± 0.08 m⊙.The analysis of the system reveals that both components are characteristic of main sequence stars and have an age of around 1.4 ± 0.50 *** evolutionary tracks and isochrones of the system’s components are discussed,and the fragmentation process is suggested as the most likely process for the formation of the system.

关键词： binaries close-binaries visual-stars fundamental parameters-technique synthetic photometry-stars individual gj 9830

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Enhancing production monitoring: A back allocation methodology to estimate well flow rates and assist well test scheduling

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Petroleum Research 2024年第3期9卷 369-379页

作者： g.S.Chaves V.j.m.Ferreira Filho Universidade Federal Do Rio de janeiro Brazil

Production flow rates are crucial to make operational decisions,monitor,manage,and optimize oil and gas *** rates also have a financial importance to correctly allocate production to fiscal purposes required by regulatory agencies or to allocate production in fields owned by multiple *** its significance,usually only the total field production is measured in real time,which requires an alternative way to estimate wells'*** address these challenges,this work presents a back allocation methodology that leverages real-time instrumentation,simulations,algorithms,and mathe-matical programming modeling to enhance well monitoring and assist in well test *** methodology comprises four modules:simulation,classification,error calculation,and *** modules work together to characterize the flowline,wellbore,and reservoir,verify simulation outputs,minimize errors,and calculate flow rates while honoring the total platform flow *** well status generated through the classification module provides valuable information about the current condition of each well(*** the well is deviating from the latest well test parameters),aiding in decision-making for well testing scheduling and *** effectiveness of the methodology is demonstrated through its application to a representative offshore oil field with 14 producing wells and two years of daily production *** results highlight the robustness of the methodology in properly classifying the wells and obtaining flow rates that honor the total platform flow ***,the methodology supports well test scheduling and provides reliable indicators for well *** uti-lizing real-time data and advanced modeling techniques,this methodology enhances production monitoring and facilitates informed operational decision-making in the oil and gas industry.

关键词： Production estimation Real-time production Production monitoring Back allocation Well test scheduling Flow rate estimation

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PIV measurements of turbulent jets issuing from triangular and circular orifice plates

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Science China(Physics,mechanics & Astronomy) 2013年第6期56卷 1176-1186页

作者： XU minYi ZHANg jianPeng mI jianChun NATHAN g j KALT P A m marine Engineering College Dalian Maritime University State Key Laboratory of Turbulence & Complex Systems College of EngineeringPeking University Centre for Energy Technology and School of mechanical Engineering University of AdelaideSA 5005Australia

The present study experimentally investigated the near-field flow mixing characteristics of two turbulent jets issuing from equilateral triangular and circular orifice plates into effectively unbounded surroundings,*** particle im.g. velocimetry(PIV) was applied to measure the velocity field at the same Reynolds number of Re=50,000,where Re = UeDe /with Ue being the exit bulk velocity and the kinematic viscosity of fluid,D e the equivalent *** instantaneous velocity,mean velocity,Reynolds stresses were *** the mean velocity field,the centreline velocity decay rate and half-velocity width were *** the mixing characteristics of the two jets,it is found that the triangular jet has a faster mixing rate than the circular *** triangular jet entrainments with the ambient fluid at a higher rate in the near *** is evidenced by a shorter unmixed core,faster Reynolds stress and centreline turbulence intensity *** primary coherent structures in the near field are found to break down more rapidly in the triangular jet as compared to the circular *** the entire measurement region,the triangular jet maintained a higher rate of decay and ***,all components of Reynolds stress of the triangular jet appear to reach their peaks earlier,and then decay more rapidly than those of the circular *** addition,the axis-switching phenomenon is observed in the triangular jet.

关键词： triangular jet turbulent mixing coherent structures axis-switching

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