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Search Results: 1 - 10 of 2282 matches for " Khamirul Amin Matori "
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Effect of AlF3 on the Density and Elastic Properties of Zinc Tellurite Glass Systems
Haji Abdul Aziz Sidek,Shaharuddin Rosmawati,Mohamed Kamari Halimah,Khamirul Amin Matori,Zainal Abidin Talib
Materials , 2012, DOI: 10.3390/ma5081361
Abstract: This paper presents the results of the physical and elastic properties of the ternary zinc oxyfluoro tellurite glass system. Systematic series of glasses (AlF 3) x(ZnO) y(TeO 2) z with x = 0–19, y = 0–20 and z = 80, 85, 90 mol% were synthesized by the conventional rapid melt quenching technique. The composition dependence of the physical, mainly density and molar volume, and elastic properties is discussed in term of the AlF 3 modifiers addition that are expected to produce quite substantial changes in their physical properties. The absence of any crystalline peaks in the X-ray diffraction (XRD) patterns of the present glass samples indicates the amorphous nature. The addition of AlF 3 lowered the values of the densities in ternary oxyfluorotellurite glass systems. The longitudinal and transverse ultrasonic waves propagated in each glass sample were measured using a MBS8020 ultrasonic data acquisition system. All the velocity data were taken at 5 MHz frequency and room temperature. The longitudinal modulus (L), shear modulus (G), Young’s modulus (E), bulk modulus (K) and Poisson’s ratio () are obtained from both velocities data and their respective density. Experimental data shows the density and elastic moduli of each AlF 3-ZnO-TeO 2 series are found strongly depend upon the glass composition. The addition of AlF 3 modifiers into the zinc tellurite causes substantial changes in their density, molar volume as well as their elastic properties.
Phase Transformations of α-Alumina Made from Waste Aluminum via a Precipitation Technique
Khamirul Amin Matori,Loy Chee Wah,Mansor Hashim,Ismayadi Ismail,Mohd Hafiz Mohd Zaid
International Journal of Molecular Sciences , 2012, DOI: 10.3390/ijms131216812
Abstract: We report on a recycling project in which α-Al 2O 3 was produced from aluminum cans because no such work has been reported in literature. Heated aluminum cans were mixed with 8.0 M of H 2SO 4 solution to form an Al 2(SO 4) 3 solution. The Al 2(SO 4) 3 salt was contained in a white semi-liquid solution with excess H 2SO 4; some unreacted aluminum pieces were also present. The solution was filtered and mixed with ethanol in a ratio of 2:3, to form a white solid of Al 2(SO 4) 3·18H 2O. The Al 2(SO 4) 3·18H 2O was calcined in an electrical furnace for 3 h at temperatures of 400–1400 °C. The heating and cooling rates were 10 °C /min. XRD was used to investigate the phase changes at different temperatures and XRF was used to determine the elemental composition in the alumina produced. A series of different alumina compositions, made by repeated dehydration and desulfonation of the Al 2(SO 4) 3·18H 2O, is reported. All transitional alumina phases produced at low temperatures were converted to α-Al 2O 3 at high temperatures. The X-ray diffraction results indicated that the α-Al 2O 3 phase was realized when the calcination temperature was at 1200 °C or higher.
Correction: Effect of AlF3 on the Density and Elastic Properties of Zinc Tellurite Glass Systems. Materials 2012, 5, 1361-1372.
Haji Abdul Aziz Sidek,Shaharuddin Rosmawati,Mohamed Kamari Halimah,Khamirul Amin Matori,Zainal Abidin Talib
Materials , 2012, DOI: 10.3390/ma5122872
Abstract: Due to an oversight, the data of the last column “Vs” in Table 1 was missing in the original version of this article [1]. [...]
Effect of ZnO on the Physical Properties and Optical Band Gap of Soda Lime Silicate Glass
Mohd Hafiz Mohd Zaid,Khamirul Amin Matori,Sidek Hj. Abdul Aziz,Azmi Zakaria,Mohd Sabri Mohd Ghazali
International Journal of Molecular Sciences , 2012, DOI: 10.3390/ijms13067550
Abstract: This manuscript reports on the physical properties and optical band gap of five samples of soda lime silicate (SLS) glass combined with zinc oxide (ZnO) that were prepared by a melting and quenching process. To understand the role of ZnO in this glass structure, the density, molar volume and optical band gaps were investigated. The density and absorption spectra in the Ultra-Violet-Visible (UV-Visible) region were recorded at room temperature. The results show that the densities of the glass samples increased as the ZnO weight percentage increased. The molar volume of the glasses shows the same trend as the density: the molar volume increased as the ZnO content increased. The optical band gaps were calculated from the absorption edge, and it was found that the optical band gap decreased from 3.20 to 2.32 eV as the ZnO concentration increased.
The Effect of Remelting on the Physical Properties of Borotellurite Glass Doped with Manganese
Syed Putra Hashim Syed Hashim,Haji Abdul Aziz Sidek,Mohamed Kamari Halimah,Khamirul Amin Matori,Wan Mohamad Daud Wan Yusof,Mohd Hafiz Mohd Zaid
International Journal of Molecular Sciences , 2013, DOI: 10.3390/ijms14011022
Abstract: A systematic set of borotellurite glasses doped with manganese (1– x) [(B 2O 3) 0.3(TeO 2) 0.7]- xMnO, with x = 0.1, 0.2, 0.3 and 0.4 mol%, were successfully synthesized by using a conventional melt and quench-casting technique. In this study, the remelting effect of the glass samples on their microstructure was investigated through density measurement and FT-IR spectra and evaluated by XRD techniques. Initial experimental results from XRD evaluation show that there are two distinct phases of glassy and crystallite microstructure due to the existence of peaks in the sample. The different physical behaviors of the studied glasses were closely related to the concentration of manganese in each phase. FTIR spectra revealed that the addition of manganese oxide contributes the transformation of TeO 4 trigonal bipyramids with bridging oxygen (BO) to TeO 3 trigonal pyramids with non-bridging oxygen (NBO).
Interactions between photodegradation components
Yadollah Abdollahi, Azmi Zakaria, Khamirul Matori, Kamyar Shameli, Hossein Jahangirian, Majid Rezayi, Tahereh Abdollahi
Chemistry Central Journal , 2012, DOI: 10.1186/1752-153x-6-100
Abstract: From the validated model demonstrated that the component had interaction with irradiation time under 180 min of the time while the interaction with pH was above pH 9. Moreover, photocatalyst and p-cresol had interaction at minimal amount of photocatalyst (< 0.8 g/L) and 100 mg/L p-cresol.These variables are interdependent and should be simultaneously considered during the photodegradation process, which is one of the advantages of the response surface methodology over the traditional laboratory method.Advanced oxidation processes (AOPs) are physicochemical procedures, which designed to remove environmental organic and inorganic pollution. Photocatalysis, the current interest of AOPs, is applied for decontamination the pollutions [1-4]. The photocatalysis, under suitable light illumination, produces hydroxyl radical (●OH) and hole (h+) which are powerful and non-selective oxidants to degrade a variety of organic compounds [5-7]. Since the photocatalytic degradation (photodegradation) is dependent on several parameters including irradiation time, pH, photocatalyst and pollution concentration, it need to study the relationship between the variables during the process [8,9]. In the design of experiments, the independent variables are controlled to determine the relationship to an observable phenomenon [10]. The single variable (one-variable-at-a-time) method considers the photodegradation process as a projection while the multivariate method generalizes the observation of the photodegradation [11]. Therefore, the multivariate, which, increases the dimension of the system and produces more generalized results is preferred in comparing with the single variable approach. Recently the semi-empirical methods were used as an efficient technique to apply multivariate modeling for the photodegradation by response surface methodology (RSM) [12-18], however, no study has yet been conducted on the parameters interaction. This work looks at the parameters interaction of p-cresol ph
Geothermal Water in Lebanon: An Alternative Energy Source  [PDF]
Amin Shaban
Low Carbon Economy (LCE) , 2010, DOI: 10.4236/lce.2010.11003
Abstract: Recently, demand for energy has been increased worldwide, notably in the view of high economic value and competi-tion of fossil fuel, as well as the negative impact of fuel consumption through carbon release, and thus the consequences on human health and environment. Various aspects of energy sources into Earth’s crust have been discovered and utilized. Geothermal energy is one aspect of these sources where they have been well pronounced in many countries and proved to be a potential energy source for the future needs. Lebanon, the country with rare natural energy, the renewable energy sources are almost ignored and there is only limited utilization of hydro-power, wind and solar energy, whilst oil imports occupy a substantial portion for energy use. Yet, geothermal energy has not raised and no concern has been given to this renewable source. Meanwhile, there are several indicators showing the existence of geothermal water in different regions in Lebanon. They almost occur where basalt rocks are exposed. This was evidenced whether from water in drilled wells or from various discharging springs, as well as indications of thermal water was observed also in many localities along the Lebanese coastal water. This study shows the available information in this respect, considering the occurrence of geothermal water in Lebanon as an alternative energy source. Thus four major geothermal domains were recognized. The study introduces detailed characterization on the existing aspects of geothermal water and inducing its hydrologic regime and mechanism of groundwater heating. It would be a reconnaissance stage that may help applying further detailed assessment.
Preferential Trade Agreements and the Law and Politics of GATT Article XXIV  [PDF]
Amin Alavi
Beijing Law Review (BLR) , 2010, DOI: 10.4236/blr.2010.11002
Abstract: The tasks Preferential Trade Agreements (PTAs) perform are expressed in their scope and covered issues, thus in order to be WTO compatible these aspects of PTAs should comply with the relevant WTO rules. This paper examines which aspects of PTAs can violate these rules and therefore can be challenged before the WTO Dispute Settlement Body, who may initiate such cases and why there hasn´t been more cases dealing with this important issue.
Support of Space Techniques for Groundwater Exploration in Lebanon  [PDF]
Amin Shaban
Journal of Water Resource and Protection (JWARP) , 2010, DOI: 10.4236/jwarp.2010.25054
Abstract: Lebanon is known by the availability in water resources whether on surface or among the existing rock for-mations. However, the status-quo does not reflect this availability due to a number of physical factors, as well as the mismanagement of these resources. Hence, the per capita has been reduced by about 50% in the last three decades. There are sixteen exposed rock formations in Lebanon, two of them are major aquifers and they are characterized by highly fractured and karstified carbonate rocks. Recently, challenges for groundwater in Lebanon have been developed. These are the: overexploitation, climate change and the acute geologic setting, which led to decline in rainfall rate, and thus exacerbated water demand. The existing chal-lenges resulted with a number of problems in ground water resources management, namely: quality deterio-ration, impact on springs and groundwater behavior, loss of groundwater o the sea, saltwater intrusion and exacerbated by the lack of data and mismanagement in water sector. In this respect, new technologies can be utilized as a helpful instrument in managing groundwater resources to treat the unfavorable situation. Space techniques and GIS have been recently raised in several topics on water resources management, including, mainly exploration and monitoring. They proved to be capable to extract hydrogeologic information and thus to manipulate this information in creditable approaches of analysis. This study introduced the present status on the Lebanese groundwater resources and the existing challenges and problems. Thus, it extends an appli-cation from Lebanon on the used new approaches for exploring groundwater.
An Application of Cyclotomic Polynomial to Factorization of Abelian Groups  [PDF]
Khalid Amin
Open Journal of Discrete Mathematics (OJDM) , 2011, DOI: 10.4236/ojdm.2011.13017
Abstract: If a finite abelian group G is a direct product of its subsets such that G = A1···Ai···An, G is said to have the Hajos-n-proprty if it follows that one of these subsets, say Ai is periodic, meaning that there exists a nonidentity element g in G such that gAi = Ai . Using some properties of cyclotomic polynomials, we will show that the cyclic groups of orders pα and groups of type (p2,q2) and (pα,pβ) where p and q are distinct primes and α, β integers ≥ 1 have this property.
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