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Relationship between single and bulk mechanical properties for zeolite ZSm5 spray-dried particles

Particuology 2014年第3期12卷 130-138页

作者： m.marigo D.L.Cairns J.Bowen A.Ingram e.h.Stitt Johnson matthey Technology Centre P.O.Box 1Belasis AvenueBillinghamCleveland TS23 1LBUnited Kingdom Centre for Formulation engineering Chemical EngineeringSchool of EngineeringThe University of BirminghamB15 2TTUnited Kingdom

In this work typical mechanical properties for a catalyst support material, ZSm5 （a spray-dried granular zeolite）, have been measured in order to relate the bulk behaviour of the powder material to the single particle mechanical properties. Particle shape and size distribution of the powders, determined by laser diffraction and scanning electron microscopy （Sem）, confirmed the spherical shape of the spray-dried particles. The excellent flowability of the material was assessed by typical methods such as the hausner ratio and the Cart index, This was confirmed by bulk measurements of the particle-particle internal friction parameter and flow function using a Schulze shear cell, which also illustrated the low compressibility of the material. Single particle compression was used to characterize single particle mechanical properties such as reduced elastic modulus and strength from hertz contact mechanics theory. Comparison with surface properties obtained from nanoindentation suggests heterogeneity, the surface being harder than the core. In order to evaluate the relationship between single particle mechanical properties and bulk compression behaviour, uniaxial confined compression was carried out. It was determined that the Adams model was suitable for describing the bulk compression and furthermore that the Adams model parameter, apparent strength of single particles, was in good agreement with the single particle strength determined from single particle compression test.

关键词： Zeolite particle Flowability Powder flow function effective angle of internal friction Schulze shear cell Nanoindentation Single particle compression Bulk compression

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Influence of surface liquid segregation on corrosion behavior of semi-solid metal high pressure die cast aluminium alloys

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中国有色金属学会会刊：英文版 2010年第S3期20卷 837-841页

作者： e.P.mASUKU h.mLLeR U.A.CURLe P.C.PISTORIUS materials Science and manufacturing Council for Scientific Industrial ResearchPretoriaSouth Africa Department of materials Science and engineering Carnegie Mellon UniversityPittsburghUSA

The corrosion behavior(in chloride medium) of the surface layer of SSm-hPDC plates of alloys 7075-T6 and 2024-T6 was compared with that of the wrought alloys 7075-T6 and *** testing was performed in deaerated 3.5%NaCl *** separate tests,the open-circuit potential was monitored in aerated 3.5% NaCl for 30 min after *** electrochemical tests show that there is no significant difference in the pitting potential of the wrought alloys and that of the Cu-enriched surfaces of the SSm-hPDC alloys.

关键词： semi-solid metal(SSm) forming wrought aluminium alloys alloy 7075 alloy 2024 corrosion surface liquid segregation

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INVeRSe PROBLemS FOR A GeNeRAL mULTI-CONNeCTeD BOUNDeD DRUm WITh APPLICATIONS IN PhYSICS

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Acta mathematica Scientia 2003年第1期23卷 104-116页

作者： e.m.e.Zayed mathematics Department Faculty of Science Zagazig University Zagazig Egypt

This paper studies the influence of a finite container on an ideal *** trace of the heat kernel (t) =exp, where are the eigenvalues of the negative Laplacian -in Rn(n = 2 or 3), is studied for a general multi-connected bounded drum ft which is surrounded by simply connected bounded domains Ωi with smooth boundaries Ωi(i = 1,… ,m) where the Dirichlet, Neumann and Robin boundary conditions on Ωi(i = 1,…,m) are considered. Some geometrical properties of Ω are determined. The thermodynamic quantities for an ideal gas enclosed in Ω are examined by using the asymptotic expansions of (t) for short-time t. It is shown that the ideal gas can not feel the shape of its container Ω, although it can feel some geometrical properties of it.

关键词： Inverse problem heat kernel eigenvalues an ideal gas multi-connected bounded domain

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mode filtering based on ponderomotive force nonlinearity in a plasma filled rectangular waveguide

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Plasma Science and Technology 2017年第10期19卷 70-74页

作者： h SOBhANI h R SABOUhI S FeILI e DADAR Young Researchers and elite Club Qom Branch Islamic Azad University Department of electrical engineering Hormoz Branch Islamic Azad University Department of Physics Shahid Bahonar University Faculty of economic Mofid University

here a new scheme for mode filtering is proposed. Based on the ponderomotive force effect,propagation of the microwave dual-mode through a plasma-filled metallic rectangular waveguide is investigated. To excite the Te_（20） mode in a rectangular waveguide, the existence of fundamental modes is unavoidable. To filter the destructive mode（Te_（10））, the waveguide is filled with a collisional plasma. Based on the coupling effect, the energy of this destructive Te_（10） mode is transferred to the Te_（20） mode. The proposed structure acts like a mode convertor. The Te_（10） mode become more attenuated and instead the Te_（20） mode is amplified. The plasma filled rectangular waveguide acts as a mode filtering tool.

关键词： mode filtering mode convertor collisional plasma ponderomotive force

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The 3D Inverse Problem of the Wave equation for a General multi-connected Vibrating membrane with a Finite Number of Piecewise Smooth Boundary Conditions

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Acta mathematica Sinica,english Series 2005年第4期21卷 733-752页

作者： e.m.e.ZAYeD mathematics Department Faculty of ScienceZagazig UniversityZagazig.Egypt

The trace of the wave kernel μ（t） =∑ω=1^∞ exp（-iteω^1/2）, where {eω}ω^∞=1 are the eigenvalues of the negative Laplacian -△↓2 = -∑k^3=1 （δ/δxk）^2 in the （x^1, x^2, x^3）-space, is studied for a variety of bounded domains, where -∞ 〈 t 〈 ∞ and i= √-1. The dependence of μ （t） on the connectivity of bounded domains and the Dirichlet, Neumann and Robin boundary conditions are analyzed. Particular attention is given for a multi-connected vibrating membrane Ω in Ra surrounded by simply connected bounded domains Ω j with smooth bounding surfaces S j （j = 1,……, n）, where a finite number of piecewise smooth Dirichlet, Neumann and Robin boundary conditions on the piecewise smooth components Si^＊（i = 1 ＋ kj-1,……, kj） of the bounding surfaces S j are considered, such that S j = Ui-1＋kj-1^kj Si^＊, where k0=0. The basic problem is to extract information on the geometry Ω by using the wave equation approach from a complete knowledge of its eigenvalues. Some geometrical quantities of Ω （e.g. the volume, the surface area, the mean curvuture and the Gaussian curvature） are determined from the asymptotic expansion ofexpansion of μ（t） for small │t│.

关键词： Inverse problem Wave kernal eigenvalues Greens function multi-connected vibrating membrane Negative Laplacian heat kernel

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The Asymptotics of the Two-Dimensional Wave equation for a General multi-Connected Vibrating membrane with Piecewise Smooth Robin Boundary Conditions

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Acta mathematica Sinica,english Series 2004年第2期20卷 209-222页

作者： e.m.e.ZAYeD Department of mathematics Faculty of ScienceZagazig UniversityZagazigEgypt

The asymptotic expansion for small |t| of the trace of the wave kernel , where and are the eigenvalues of the negative Laplacian in the (x 2,x 2)-plane, is studied for a multi-connected vibrating membrane ? in R 2 surrounded by simply connected bounded domains ? j with smooth boundaries ?? j (j = 1, ..., n), where a finite number of piecewise smooth Robin boundary conditions on the piecewise smooth components Γ i (i = 1+k j?1, ..., k j ) of the boundaries ?? j are considered, such that and k 0 = 0. The basic problem is to extract information on the geometry of ? using the wave equation approach. Some geometric quantities of ? (e. g. the area of ?, the total lengths of its boundary, the curvature of its boundary, the number of the holes of ?, etc.) are determined from the asymptotic expansion of the trace of the wave kernel for small |t|.

关键词： Inverse problem Wave kernel eigenvalues Robin boundary conditions Vibrating membrane hearing the shape of a drum

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enhancement Factors in Ozone Absorption Based on the Surface Renewal model and its Application

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Chinese Journal of Chemical engineering 2000年第3期8卷 236-240页

作者：程江杨卓如陈焕钦 C.h.Kuo m.e.Zappi CollegeofChemicalenglneering SouthChinaUniversityofTechnologyGuangzhou51（~641~China DepartmentofChemicalengineering MississippiStateUniversityMS39762StarkvilleUSA

Based on the Danckwerts surface renewal model, a simple explicit expression of the enhancement factor in ozone absorption with a first order ozone self-decomposition and parallel second order ozonation reactions has been derived. The results are compared with our previous work based on the film theory. The 2,4-dichlorophenol destruction rate by ozonation is predicted using the enhancement factor model in this paper.

关键词： enhancement factor ozone absorption surface renewal model

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Asymptotic expansions of the heat Kernel of the Laplacian for General Annular Bounded Domains with Robin Boundary Conditions：Further Results

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Acta mathematica Sinica,english Series 2003年第4期19卷 679-694页

作者： e.m.e.ZAYeD Departmentofmathematics FacultyofScienceZagazigUniversityZagazigEgypt

The asymptotic expansions of the trace of the heat kernel Θ(t) = Σ_(v =1)~∞exp(-tλ_v) for small positive t, where {λ_v} are the eigenvalues of the negative Laplacian-△_n = -Σ_(i = 1)~n(partial deriv/(partial deriv)x^i)~2 in R^n (n = 2 or 3), are studied for ageneral annular bounded domain Ω with a smooth inner boundary (partial deriv)Ω_1 and a smoothouter boundary (partial deriv)Ω_2, where a finite number of piecewise smooth Robin boundaryconditions (partial deriv/(partial deriv)n_j + γ_j)φ = 0 on the components Γ_j(j = 1, …, k) of(partial deriv)Ω_1 and on the components Γ_j(j = k + 1, …, m) of (partial deriv)Ω_2 areconsidered such that (partial deriv)Ω_1 = ∪_(j = 1)~kΓ_j and (partial deriv)Ω_2 = ∪_(j = k +1)~mΓ_j and where the coefficients γ_j(j = 1, …, m) are piecewise smooth positive functions. Someapplications of Θ(t) for an ideal gas enclosed in the general annular bounded domain Ω are *** results are also obtained.

关键词： inverse problem heat kernel eigenvalues Robin boundary conditions classical ideal gas

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Constraining the f(R,T)=R+2λT cosmological model using recent observational data

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Chinese Physics C 2023年第11期47卷 167-176页

作者： N.myrzakulov m.Koussour Alnadhief h.A.Alfedeel e.I.hassan L.N.Gumilyov eurasian National University Astana 010008Kazakhstan Ratbay myrzakulov eurasian International Centre for Theoretical Physics Astana 010009Kazakhstan Quantum Physics and magnetism Team LPMCFaculty of Science Ben M'sikCasablanca Hassan II UniversityMorocco Department of mathematics and Statistics Imam Mohammad Ibn Saud Islamic University(IMSIU)Riyadh 13318Saudi Arabia Department of Physics Faculty of ScienceUniversity of KhartoumP.O.Box 321Khartoum 11115Sudan Centre for Space Research North-West UniversityPotchefstroom 2520South Africa

In this study,we conduct a comprehensive investigation of the cosmological model described by f(R,T)=R+2λT(whereλrepresents a free parameter)in light of the most recent observational *** constraining the model using the hubble and Pantheon datasets,we determine its compatibility with the observed behavior of the *** this purpose,we adopt a parametric form for the effective equation of state(eoS)*** parametric form allows us to describe the evolution of the eoS parameter with respect to redshift and investigate its behavior during different cosmic *** analysis of the deceleration parameter reveals an accelerating Universe with a present value of q0=−0.64_(−0.03)^(+0.03),indicating the current phase of accelerated *** transition redshift is found to be ztr=0.53_(−0.03)^(+0.04),marking the epoch of transition from deceleration to *** also analyze the evolution of important cosmological parameters,including the density parameter,pressure,effective eoS,and *** findings collectively demonstrate the viability of the f(R,T)cosmological model as a robust candidate capable of engendering the requisite negative pressure,thereby efficiently propelling cosmic ***,the undertaken stability analysis underscores the model's stability within the broader cosmic *** providing the best-fit values for the coupling parameterλ,this approach motivates and encourages further exploration into the extensive landscape of this model and its potential applications across diverse realms of cosmology and astronomy.

关键词： f(R,T)gravity eoS parameter observational constraints dark energy

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Quantum Correlations in Ising-XYZ Diamond Chain Structure under an external magnetic Field

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Chinese Physics Letters 2015年第10期32卷 9-13页

作者： Faizi e. eftekhari h. Department of Physics Azerbaijan Shahid Madani University

We consider an entangled Ising-XY Z diamond chain structure. Quantum correlations for this model are inves- tigated by using quantum discord and trace distance discord. Quantum correlations are obtained for different values of the anisotropy parameter, magnetic field and temperature. By comparison between quantum correlations, we show that the trace distance discord is always larger than quantum discord. Finally, some novel effects such as increasing the quantum correlations with temperature and constructive role of anisotropy parameter, which may play to the quantum correlations, are observed.

关键词： TDD Quantum Correlations in Ising-XYZ Diamond Chain Structure under an external magnetic Field

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