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Characteristic properties of date-palm fibre/sheep wool reinforced polyester composites

Journal of Bioresources and Bioproducts 2023年第4期8卷 430-443页

作者： Mohammed Y.Abdellah mustafa gamal.sadek Hamzah Alharthi G.T.Abdel-Jaber Ahmed H.Backar Mechanical Engineering Department Faculty of EngineeringSouth Valley UniversityQena83523Egypt Mechanical Engineering Department College of Engineering and Islamic ArchitectureUmm AL-Qura UniversityMakkah21955Saudi Arabia New Assiut Technological University(NAUT) Assiut71684Egypt Production Engineering Department Faculty of EngineeringAlexandria UniversityAlexandria21544Egypt

In this study,we attempted to characterise the effects of date-palm fibre(DPF)and a date-palm fibre/sheep wool hybrid in polyester to enhance high-performance and low-cost composite materials that can be used in insulation building systems,automotive parts,and home *** DPF was treated using 5%NaOH solution;and the sheep wool was cleaned with 50℃hot water and *** composite specimens were prepared with different fibre contents(0%,10%,20%,30%(w))using a compression moulding *** effect of fibre reinforcement was analysed in terms of the mechanical properties(tensile,flexural,impact,and hardness)and composite ***,scanning electron microscopy(SEM)was performed on the fibres before and after treatment,and the fractured surfaces of all composite specimens were examined after tensile *** results showed that the 20%DPF/sheep wool hybrid reinforced polyester produced the best *** ultimate tensile strength and modulus were 27 MPa and 3.69GPa,*** ultimate flexural strength and flexural modulus were 35.4 and 2507 MPa,*** impact strength was 39.5 kJ/m^(2)and the hardness was 64 *** density decreased to the lowest value of 1.02 g/cm^(3)with the 30%DPF/sheep wool *** SEM showed good adhesion and interfacial bonding between DPF/sheep wool hybrid fibres and the polyester matrix,particularly at 20%fibre content.

关键词： Date-palm fibre Polyester Compression moulding Mechanical property

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High Velocity Forming of Aluminum Cylindrical Cups-Experiments and Numerical Simulations

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Journal of Materials Science & Technology 2007年第2期23卷 230-236页

作者： mustafa YASAR Faculty of Technical Education ZKU/Zonguldak Karaelmas UniversityKarabukTurkey

A new two stage detonation forming machine was developed and cylindrical aluminum cups were formed by using gas detonation forming technology. The forming process was analyzed with the explicit finite element method with various parameters and ANSYS/LS-DYNA software. Defects of wrinkling and rupture were predicted for some forming conditions. The strain and the thickness distribution results were in good agreement with the experimental results. It was seen that thinning and forming mainly take place during the one fourth of the time. The effects of detonation pressure and blank holding force on the deformation of the work pieces were discussed. The numerical results were compared with those obtained in the experiments.

关键词： Detonation forming Explicit finite element Detonation pressure

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ELECTRORHEOLOGICAL PROPERTIES OF POLYANILINE/PUMICE COMPOSITE SUSPENSIONS

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Chinese Journal of Polymer Science 2007年第4期25卷 347-355页

作者： mustafa Yavuz Department of Chemistry Faculty of Arts and ScienceSüleyman Demirel University32260 IspartaTurkey

Electrorheological （ER） properties of polyaniline （PAni）, pumice and polyaniline/pumice composites （PAPC） were investigated. Polyaniline and PAni/pumice composite were prepared by oxidative polymerization. PAni/pumice particlesbased ER suspensions were prepared in silicone oil （SO）, and their ER behavior was investigated as a function of shear rate, electric field strength, concentration and temperature. Sedimentation stabilities of suspensions were determined. It has been found that ER activity of all the suspensions increases with increasing electric field strength, concentration and decreasing shear rate. It has shown that the suspensions have a typical shear thinning non-Newtonian viscoelastic behavior. Yield stress of composite suspensions increased linearly with increasing applied electric field strength and with concentrations of the particles. The effect of high temperature on ER activity of purrfice/silicone oil systems was also investigated.

关键词： Electrorheology Yield stress Pumice Composite Suspension

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Influence of Grain Size on Electrical and Optical Properties of InP Films

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Chinese Physics Letters 2008年第11期25卷 4090-4092页

作者： mustafa Oztas Engineering Faculty Department of Engineering Physics Gaziantep University 27310-Gaziantep Turkey

InP film samples were prepared by spray pyrolysis technique using aqueous solutions of InCl3 and Na2HPO4, which were atomized with compressed air as carrier gas onto glass substrates at 500℃ with different thicknesses of the films. It is found that the resistivity of the polycrystalline films strongly depends on the grain size. It is observed that the grain size of the films increase with the decrease of the energy band gap and strain of the film. The changes observed in the energy band gap and strain related to the film grain size of the films are discussed in detail.

关键词： the power-law exponents precipitation durative abrupt precipitation change

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Determining the surface fault-rupture hazard zone for the Pazarcık segment of the East Anatolian fault zone through comprehensive analysis of surface rupture from the February 6,2023,Earthquake(Mw 7.7)

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Journal of Mountain Science 2024年第8期21卷 2646-2663页

作者： mustafa SOFTA Dokuz Eylul University Department of Geological Engineering Izmir 35390Türkiye Kansas State University Department of Geology Manhattan 66506KansasUSA

Following surface rupture observations in populated areas affected by the KahramanmaraşEarthquake(Mw 7.7)on February 6th,2023,along the Pazarcık segment of the East Anatolian Fault Zone(EAFZ),this study presents novel insights into physical criteria for delineating surface fault-rupture hazard zones(SRHZs)along ruptured strike-slip *** achieve this objective,three trench studies across the surface rupture were conducted on the Pazarcık segment of the EAFZ to collect field data,and earthquake recurrence intervals were interpreted using Bayesian statistics from previously conducted paleoseismological *** results of the proposed model indicate that the Pazarcık segment produced five significant surface-rupturing earthquakes in the last∼11 kyr:E1:11.13±1.74 kyr,E2:7.62±1.20 kyr,E3:5.34±1.05 kyr,E4:1.82±0.93 kyr,and E5:0.35±0.11 *** addition,the recurrence intervals of destructive earthquakes on the subject in question range from 0.6 kyr to 4.8 *** that the last significant earthquake occurred in 1513,the longest time since the most recent surface fault rupturing earthquake on this particular segment was 511 *** results indicate that,in terms of the theoretical recurrence interval of earthquakes that can create surface ruptures on the Pazarcık segment,the period in which the February 6,2023,earthquake occurred was within the end of the expected return *** a result,the potential for a devastating earthquake in the near future is not foreseen on the same ***,the SRHZ proposed for the Pazarcık section of Gölbaşıvillage was calculated as a 61-meter-wide offset on the fault lineament to reduce the negativities that may occur in the ruptured area in the *** is recommended to take into account this width in the settlement of this area and nearby areas.

关键词： Surface rupture Earthquake mitigation Recurrence interval Pazarcık segment East Anatolian Fault Zone(EAFZ)

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An ethnobotanical study of medicinal plants in Güce district,north-eastern Turkey

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Plant Diversity 2022年第6期44卷 577-597页

作者： mustafa Karakose Giresun University Espiye Vocational SchoolProgramme of Medicinal and Aromatic PlantsEspiyeGiresun28600Turkey

This study aims to identify medicinal plants traditionally used to treat diseases by local people living in Güce district,north-eastern *** study was carried out between 2018 and 2021 using a two-part semi-structured,open-ended questionnaire with 165 local *** were analysed using use-report,frequency of citation,and informant consensus *** identified 128 vascular medicinal plant taxa belonging to 54 families and 106 *** most common plant taxa belong to Rosaceae(16 taxa/12.5%),Asteraceae(12 taxa/9.4%),and Lamiaceae(9 taxa/7%)*** most frequently used preparation method reported was decoction(39.8%);the most commonly utilized plant parts were leaves(40.3%).Statistical analysis reveals that women in Güce district(df?163,p?0.043<0.05)possess the most traditional *** highest frequency of citation(61)and use report(92)were recorded for Tilia rubra ***,and the highest informant consensus factors were cited for respiratory system disorders(0.86),digestive system disorders(0.73),and skin disorders(0.71).This study reported nine plant taxa as medicinal plants for the first time,and documented a total of 293 new therapeutic ***,the study indicates that the transfer of traditional knowledge to future generations is limited(F?3.355,p?0.020).Action should be taken as soon as possible to preserve existing traditional knowledge and to ensure its transfer to future generations.

关键词： Colchic Ethnobotany Informant consensus factor Frequency of citation Traditional medicine Use-record

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EFFECT OF VINYL ACETATE CONTENT ON THE MECHANICAL PROPERTIES AND MORPHOLOGICAL STRUCTURES OF POLYPROPYLENE

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Chinese Journal of Polymer Science 2006年第1期24卷 29-34页

作者： mustafa ksüz Technical Education Faculty Marmara University 34722 GztepeIstanbulTurkey

The effect of vinyl acetate （VA） content in ethylene vinyl acetate （EVA） copolyrner on the mechanical properties of polypropylene was investigated. Three different EVA copolymers with concentrations of 3 wt%, 6 wt%, 9 wt%, 12 wt% and 15 wt%, were blended to polypropylene. The mechanical properties such as yield and tensile strengths, elastic modulus, Izod impact strength, hardness and melt flow index of the blends were investigated. Relationship between type of vinyl acetate and concentrations, mechanical, MFI and morphological properties were explored.

关键词： Compound Mechanical properties Morphology.

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Decomposition method for solving parabolic equations in finite domains

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Journal of Zhejiang University-Science A(Applied Physics & Engineering) 2005年第10期6卷 1058-1064页

作者： INC mustafa Department of Mathematics Firat University Elazig 23119Turkey

This paper presents a comparison among Adomian decomposition method (ADM), Wavelet-Galerkin method (WGM), the fully explicit (1,7) finite difference technique (FTCS), the fully implicit (7,1) finite difference method (BTCS), (7,7) Crank-Nicholson type finite difference formula (C-N), the fully explicit method (1,13) and 9-point finite difference method, for solving parabolic differential equations with arbitrary boundary conditions and based on weak form functionals in finite domains. The problem is solved rapidly, easily and elegantly by ADM. The numerical results on a 2D transient heat conducting problem and 3D diffusion problem are used to validate the proposed ADM as an effective numerical method for solving finite domain parabolic equations. The numerical results showed that our present method is less time consuming and is easier to use than other methods. In addition, we prove the convergence of this method when it is applied to the nonlinear parabolic equation.

关键词： Adomian decomposition method (ADM) Adomian polynomials Parabolic differential equations

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New Compacton Solutions of Nonlinearly Dispersive R（m, n） Equations

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Communications in Theoretical Physics 2006年第3期45卷 389-394页

作者： mustafa Inc Department of Mathematics Firat University 23119 Elazig Turkiye

In this paper, we establish exact solutions for the .R（m,n） equations by using an sn-cn metnou,As a result, abundant new cornpactons, i,e, solitons with the absence of infinite wings, new type of Jacobi elliptic function, solitary wave and periodic wave solutions, of this equation are obtained with minimal calculations. The properties of the R（m, n） equations are shown in figures.

关键词： R(m n) equation compacton solution soliton

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Parameter Estimation Based on Censored Data under Partially Accelerated Life Testing for Hybrid Systems due to Unknown Failure Causes

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Computer Modeling in Engineering & Sciences 2022年第3期130卷 1239-1269页

作者： mustafa Kamal Department of Basic Sciences College of Science and Theoretical StudiesSaudi Electronic UniversityDammam32256Saudi Arabia

In general,simple subsystems like series or parallel are integrated to produce a complex hybrid *** reliability of a system is determined by the reliability of its constituent *** is often extremely difficult or impossible to get specific information about the component that caused the system to *** failure causes are instances in which the actual cause of systemfailure is *** the other side,thanks to current advanced technology based on computers,automation,and simulation,products have become incredibly dependable and trustworthy,and as a result,obtaining failure data for testing such exceptionally reliable items have become a very costly and time-consuming ***,because of its capacity to produce rapid and adequate failure data in a short period of time,accelerated life testing(ALT)is the most utilized approach in the field of product reliability and life *** on progressively hybrid censored(PrHC)data froma three-component parallel series hybrid system that failed to owe to unknown causes,this paper investigates a challenging problem of parameter estimation and reliability assessment under a step stress partially accelerated life-test(SSPALT).Failures of components are considered to follow a power linear hazard rate(PLHR),which can be used when the failure rate displays linear,decreasing,increasing or bathtub failure *** Tempered random variable(TRV)model is considered to reflect the effect of the high stress level used to induce early failure *** maximum likelihood estimation(MLE)approach is used to estimate the parameters of the PLHR distribution and the acceleration factor.A variance covariance matrix(VCM)is then obtained to construct the approximate confidence intervals(ACIs).In addition,studentized bootstrap confidence intervals(ST-B CIs)are also constructed and compared with ACIs in terms of their respective interval lengths(ILs).Moreover,a simulation study is conducted to demonstrate the

关键词： Step stress partially accelerated life test progressive hybrid censoring data masking power linear hazard rate distribution hybrid system

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