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Nonlinear optical characterization of phosphate glasses based on ZnO using the Z-scan technique

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Chinese Physics B 2013年第11期22卷 594-598页

作者： Masoumeh Shokati Mojdehi wan mahmood mat yunus Khor Shing Fhan Zainal Abidin Talib N.Tamchek Department of Physics Faculty of Science Universiti Putra Malaysia School of Electrical Systems Engineering Universiti Malaysia Perlis Campus Pauh Putra

The nonlinear optical properties of a phosphate vitreous system [（ZnO）x-（MgO）30-x-（P2O5）70], where x=8, 10, 15, 18, and 20 mol% synthesized through the melt-quenching technique have been investigated by using the Z-scan technique. In the experiment, a continuous-wave laser with a wavelength of 405 nm was utilized to determine the sign and value of the nonlinear refractive （NLR） index and the absorption coefficient with closed and opened apertures of the Z-scan setup. The NLR index was found to increase with the ZnO concentration in the glass samples by an order of 10-10 cm2·W-1. The real and imaginary parts of the third-order nonlinear susceptibility were calculated by referring to the NLR index （n2） and absorption coefficient （β） of the samples. The value of the third-order nonlinear susceptibility was presented by nonlinear refractive or absorptive behavior of phosphate glasses for proper utilization in nonlinear optical devices. Based on the measurement, the positive sign of the NLR index shows a self-focusing phenomenon. The figures of merit for each sample were calculated to judge the potential of phosphate glasses for application in optical switching.

关键词： Z-scan technique nonlinear refractive index nonlinear absorption coefficient phosphate glasses

Optical properties for N,N’-bis (lnaphyhly)N,N’-diphenyl-1,1’-biphenyl-4,4’-diamine and tris (8-hydroxyquinolinato) aluminum in organic light emitting devices

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Natural Science 2010年第6期2卷 631-634页

作者： Mei Yee Lim wan mahmood mat yunus Zainal Abidin Talib Anuar Kassim 不详

The optical properties of N,N’-bis (Inaphthyl)N,N’-diphenyl-1,1’-biphenyl-4,4’-diamine (NPB) and tris (8-hydroxyquinolinato) aluminum (Alq3) organic materials used as hole transport and electron transport layers in organic light-emitting devices (OLED) have been investigated. The NPB and Alq3 layers were prepared using thermal evaporation method. The results show that the energy band gap of Alq3 is thickness independence while the energy band gap of NPB decreases with the increasing of sample thickness. For the case of photoluminescence the Alq3 with thickness of 84 nm shows the highest relative intensity peak at 510 nm.

关键词： Energy Band Gap N N’-Bis (Inaphthyl) -N N’-Diphenyl-1 1’-Biphenyl-4 4’-Diamine Tris (8 Hydroxyquinolinato) Aluminum Organic Light Emitting Diode Photoluminescence

X-Ray Diffraction Analysis of Thermally Evaporated Copper Tin Selenide Thin Films at Different Annealing Temperature

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材料科学与工程（中英文版） 2010年第12期4卷 28-33页

作者： Mohd Amirul Syafiq Mohd Yunos Zainal Abidin Talib wan mahmood mat yunus Meor Yusoff MeorSulaiman Josephine Liew Ying Chyi Wilfred Sylvester Paulus Physics Department Faculty of Science Universiti Putra Malaysia UPM Serdang 43400 Selangor Darul Ehsan Malaysia Industrial Technology Division Malaysian Nuclear Agency Bangi Kajang 43000 Selangor Darul Ehsan Malaysia

Seismic Liquefaction Resistance Based on Strain Energy Concept Considering Fine Content Value Effect and Performance Parametric Sensitivity Analysis

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Computer Modeling in Engineering & Sciences 2023年第4期135卷 733-754页

作者： Nima Pirhadi Xusheng wan Jianguo Lu Jilei Hu mahmood Ahmad Farzaneh Tahmoorian School of Civil Engineering and Geomatics Southwest Petroleum UniversityChengdu610500China Key Laboratory of Geological Hazards on ThreeGorges ReservoirArea Ministry of EducationChina Three Gorges UniversityYichang443002China College of Civil Engineering&Architecture China Three Gorges UniversityYichang443002China Department of Civil Engineering Faculty of EngineeringInternational Islamic University MalaysiaJalan GombakSelangor50728Malaysia Department of Civil Engineering University of Engineering and Technology Peshawar(Bannu Campus)Bannu28100Pakistan Central Queensland University Queensland4740Australia

Liquefaction is one of the most destructive phenomena caused by earthquakes,which has been studied in the issues of potential,triggering and hazard *** strain energy approach is a common method to investigate liquefaction *** this study,two Artificial Neural Network(ANN)models were developed to estimate the liquefaction resistance of sandy soil based on the capacity strain energy concept(W)by using laboratory test data.A large database was collected from the *** group of the dataset was utilized for validating the process in order to prevent overtraining the presented *** investigate the complex influence of fine content(FC)on liquefaction resistance,according to previous studies,the second database was arranged by samples with FC of less than 28%and was used to train the second ANN ***,two presented ANN models in this study,in addition to four extra available models,were applied to an additional 20 new samples for comparing their results to show the capability and accuracy of the presented models ***,a parametric sensitivity analysis was performed through Monte Carlo Simulation(MCS)to evaluate the effects of parameters and their uncertainties on the liquefaction resistance of *** to the results,the developed models provide a higher accuracy prediction performance than the previously *** sensitivity analysis illustrated that the uncertainties of grading parameters significantly affect the liquefaction resistance of soils.

关键词： Liquefaction resistance capacity strain energy artificial neural network sensitivity analysis Monte Carlo Simulation

Evidence of Cu（Ⅱ） Ion Interaction in Crosslinked Chitosan Thin Film from X-Ray Photoelectron Spectroscopy and Field Emission Scanning Electron Microscopy

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材料科学与工程（中英文B版） 2011年第5期1卷 584-590页

作者： Yap Wing Fen mat yunus wan mahmood Department of Physics Faculty of Science Universiti Putra Malaysia UPM Serdang 43400 Selangor Malaysia

Sequestration of toxic Pb(Ⅱ) ions by chemically treated rubber(Hevea brasiliensis) leaf powder

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Journal of Environmental Sciences 2010年第2期22卷 248-256页

作者： Megat Hanafiah Megat Ahmad Kamal wan mat Khalir wan Khaima Azira Mohamed Kasmawati Zakaria Haslizaidi wan Ngah wan Saime Faculty of Applied Sciences Universiti Teknologi MARA Pahang26400 JengkaPahangMalaysia Faculty of Applied Sciences Universiti Teknologi MARA40450 Shah AlamSelangorMalaysia School of Chemical Sciences Universiti Sains Malaysia11800 MindenPenangMalaysia

Rubber leaf powder （an agricultural waste） was treated with potassium permanganate followed by sodium carbonate and its performance in the removal of Pb（II） ions from aqueous solution was evaluated. The interactions between Pb（II） ions and functional groups on the adsorbent surface were confirmed by Fourier transform infrared （FT-IR） spectroscopy, scanning electron microscopy （SEM） coupled with X-ray energy dispersive spectroscopy （EDX）. The effects of several important parameters which can affect adsorption capacity such as pH, adsorbent dosage, initial lead concentration and contact time were studied. The optimum pH range for lead adsorption was 4-5. Even at very low adsorbent dosage of 0.02 g, almost 100% of Pb（II） ions （23 mg/L） could be removed. The adsorption capacity was also dependent on lead concentration and contact time, and relatively a short period of time （60-90 min） was required to reach equilibrium. The equilibrium data were analyzed with Langmuir, Freundlich and Dubinin-Radushkevich isotherms. Based on Langmuir model, the maximum adsorption capacity of lead was 95.3 mg/g. Three kinetic models including pseudo first-order, pseudo second-order and Boyd were used to analyze the lead adsorption process, and the results showed that the pseudo second-order fitted well with correlation coefficients greater than 0.99.

关键词： adsorption isotherm kinetics lead rubber leaf powder

Characterization of the Optical Properties of Heavy Metal Ions Using Surface Plasmon Resonance Technique

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Optics and Photonics Journal 2011年第3期1卷 116-123页

作者： Yap Wing Fen W. mahmood mat yunus 不详

The aim of this research is to characterize the optical properties of heavy metal ions (Hg2+, Cu2+, Pb2+ and Zn2+) using surface plasmon resonance (SPR) technique. Glass cover slips, used as substrates were coated with a 50 nm gold film using sputter coater. The measurement was carried out at room temperature using Kretchmann SPR technique. When the air medium outside the gold film is changed to heavy metal ions solution, the resonance angle shifted to the higher value for all samples of heavy metal ions solution. By our developed fitting program (using matlab software), the experimental SPR curves were fitted to obtain the refractive index of Hg2+, Cu2+, Pb2+ and Zn2+ ions solution with different concentrations. Both the real and imaginary part of refractive index of the heavy metal ions solution increased with the concentration. The results give the basic idea such that the SPR technique could be used as an alternative optical sensor for detecting heavy metal ions in solution.

关键词： Surface Plasmon Resonance Optical Properties Heavy Metal Ions

Experimental and numerical investigations of interface properties of Ti6Al4V/CP-Ti/Copper composite plate prepared by explosive welding

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Defence Technology（防务技术） 2021年第5期17卷 1592-1601页

作者： Yasir mahmood Peng-wan Chen I.A.Bataev Xin Gao State Key Lab of Explosion Science and Technology Beijing Institute of Technology100081PR China Novosibirsk State Technical University K.Marks 20630073NovosibirskRussia

Explosive welding technique is widely used in many *** technique is useful to weld different kinds of metal alloys that are not easily welded by any other welding *** plays an important role to improve the welding quality and control energy loss during the collision *** this paper,the Ti6Al4V plate was welded with a copper plate in the presence of a commercially pure titanium *** details of welded composite plate were observed through optical and scanning electron ***-base plate interface morphology showed a wavy structure with solid melted regions inside the ***,the energy dispersive spectroscopy analysis in the interlayer-base interface reveals that there are some identified regions of different kinds of chemical equilibrium phases of CueTi,***,Cu_(2)Ti,CuTi_(2),Cu_(4)Ti,*** study the mechanical properties of composite plates,mechanical tests were conducted,including the tensile test,bending test,shear test and Vickers hardness *** simulation of explosive welding process was performed with coupled Smooth Particle Hydrodynamic method,Euler and Arbitrary Lagrangian-Eulerian *** multi-physics process of explosive welding,including detonation,jetting and interface morphology,was observed with ***,simulated plastic strain,temperature and pressure profiles were analysed to understand the welding *** results show that the interlayer base plate interface was created due to the high plastic deformation and localized melting of the parent *** the collision point,both alloys behave like fluids,resulting in the formation of a wavy morphology with vortices,which is in good agreement with the experimental results.

关键词： Explosive welding Ti6Al4V/CP-Ti/Cu Smooth particle hydrodynamic(SPH) Microstructure Mechanical properties

Ternary phase behavior of water microemulsified diesel-palm biodiesel

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Frontiers in Energy 2015年第2期9卷 162-169页

作者： Nurul Atiqah Izzati MD ISHAK lsmail Ab RAMAN Mohd Ambar YARMO wan Mohd Faizal wan mahmood School of Chemical Sciences and Food Technology Faculty of Scienceand Technology Universiti Kebangsaan Malaysia UKM Bangi 43600Malaysia Advanced Oleochemical Technology Division (AOTD) MalaysianPalm Oil Board (MPOB) 6 Persiaran Institusi Bandar Baru BangiKajang 43000 Malaysia Department of Mechanical and material Engineering Faculty ofEngineering and Built Environment Universiti Kebangsaan MalaysiaUKM Bangi 43600 Malaysia

This paper aims to develop a new microemul- sions system comprising diesel and palm oil methyl ester （PME） that have the potential to be used as alternative fuels for diesel engines. The water-in-diesel-biodiesel micro- emulsions were prepared by applying PME mixed with diesel, non-ionic surfactants, co-surfaetants and water to make the water-in-oil （W/O） microemulsion system. This microemulsified fuel was achieved through low-energy microemulsification by using the constant composition method. The diesel used was mixed with four different concentrations of PME, i.e., 10% （w/w）（B10）, 20% （w/w）（B20）, 30% （w/w）（B30） and neat diesel （B0）. The amount of water was fixed at 20% （w/w）. The phase behavior of the water/mixed non-ionic surfactant/diesel-PME system were studied by constructing pseudoternary phase diagrams with the goal of formulating optimized systems. The results showed that the microemulsions were formed and stabilized with a mixture of non-ionic surfactants at a weight ratio of 80：20 at 20% （w/w）, and with mixed co-surfactants at a weight ratio of 25：75, 20：80 and 10：90 for B0, B10, B20 and B30 respectively. The particle size, kinematic viscosity at 40℃, refractive index, density, heating value, cloud point, pour pointand flash point of the selected water-in-diesel microemulsion were 19.40 nm （polydispersity of 0.012）, 12.86mm^2/s, 1.435, 0.8913g/mL, 31.87MJ/kg, 7.15℃, 10.5℃ and 46.5℃ respectively. The corresponding values of the water-in-diesel@ME selected were 20.72nm to 23.74nm, 13.02mme/s to 13.29mmZ/s, 1.442, 0.8939g/mL to 0.8990g/mL, 31.45MJ/kg to 27.34 MJ/kg, 7.2℃ to 6.8℃, 8.5℃ to 1.5℃ and 47.5℃ to 52.0℃. These preliminary findings were further studied as potential fuels for diesel engines.

关键词： palm methyl ester palm oil biodiesel micro-emulsion water mieroemulsified fuels