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Low-energy X-ray attenuation characteristics of Rhizophora ***

Nuclear Science and Techniques 2021年第3期32卷 11-29页

作者： Damilola Oluwafemi Samson Ahmad Shukri mohd zubir mat jafri Rokiah Hashim mohd Zahri Abdul Aziz Sylvester Jande Gemanam mohd Fahmi mohd Yusof School of Physics Universiti Sains Malaysia11800 GelugorPenangMalaysia School of Industrial Technology Universiti Sains Malaysia11800 GelugorPenangMalaysia Advanced Medical and Dental Institute Universiti Sains Malaysia13200 BertamPenangMalaysia School of Health Sciences Universiti Sains Malaysia16150 Kota BharuKelantanMalaysia

Photon absorption parameters such as mass attenuation coefficients(μ_m),molar extinction coefficients(ε),total molecular(σ_(t,m)),atomic(σ_(t,a))and electronic(σ_(t,el))cross sections,half-value layers(X_(1/2)),tenth-value layers(X_(1/10)),mean free paths(λ),effective atomic numbers(Z_(eff)),and effective electron densities(N_(el))were estimated for defatted soy flour(DSF),soy protein concentrate(SPC),and soy protein isolate(SPI)-based Rhizophora *** composites substituted with 10 wt%sodium hydroxide(NaOH)and 0,5,10,and 15 wt%itaconic acid polyamidoamine-epichlorohydrin(IA-PAE)*** composition was assessed using ultrahigh-resolution field emission scanning electron microscopy-energy dispersive X-ray spectrometry(UHR-FESEM-EDX).The interaction parameters were evaluated for K_(α1)photons at16.59,17.46,21.21,and 25.26 keV,employing a low-energy germanium(LEGe)detector system and an~(241)Amγ-ray source.X-ray diffraction characterization revealed an amorphous phase in the developed particleboard *** DSF15',SPC15',and SPI15'exhibited the highest values ofμ_m,ε,σ_(t,m),Zeff,and N_(el)among all of the studied particleboard samples,within the range of measured photon *** addition,all of the modified samples exhibited lower X_(1/2),X_(1/10),λ,σ_(t,a),andσ_(t,el)than the unmodified samples,with DSF-,SPC-,and SPI/NaOH/Rhizophora spp./IA-PAE(15 wt%),indicating insignificant *** current results of the particleboard samples'analysis can be useful for medical radiation applications and shielding research.

关键词： Photon interaction parameters Shielding DSF–SPC–SPI Particleboards NaOH/IA-PAE

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Monitoring Surface Water Quality in Coastal Area of Penang

Monitoring Surface Water Quality in Coastal Area of Penang

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International Conference on Environment Science and Engineering（ICESE 2011）

作者： Saumi Syahreza Lim Hwee San mohd zubir mat jafri mohd Rifhan Mustapha Department of Physics Syiah Kuala University Aceh 23111 Banda Aceh Indonesia School of Physics Universiti Sains Malaysia (USM) 11800 Penang Malaysia

The water quality parameter total suspended solids in the coastal area of Penang Island, Malaysia have been studied using Landsat TM data. The aim of this study was to test the feasibility of using satellite data for mapping and monitoring water quality parameter total suspended solids (TSS) by using remote sensing and digital processing techniques. The model used in this study is based on the reflectance model which is a function of the inherent optical properties (IOP) of water and this in turn can be related to the concentration of its constituents. The digital numbers for each band corresponding to the sea-truth locations were extracted and then converted into radiance and reflectance values. The reflectance values were used for calibration of the water quality algorithm. The efficiency of the proposed algorithm was investigated based on the observations of correlation coefficient (R) and root-mean-square deviations (RMS) using the sea truth data. The proposed algorithm is considered superior to other tested algorithms based on the values of the correlation coefficient, R=0.93 and root-mean square error, RMS=9 mg/l. The calibrated TSS algorithm was used to generate the water quality maps. The water quality image was geometrically corrected and image smoothing was performed on the map to remove random noise. The generated map was color-coded for visual interpretation.

关键词： water quality landsat TM TSS

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Solar Erythemal Dose Rate over Peninsular Malaysia Obtained by Ozone Monitoring Instrument

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材料科学与工程（中英文版） 2010年第10期4卷 98-100页

作者： Nor Hidayah Hisamuddin Shah Lim Hwee San mohd. zubir mat jafri School of Physics Universiti Sains Malaysia Penang 11800 Malaysia

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Feasibility of using multi-band imageries captured by Cropcam Unmanned Aerial Vehicle autopilot for land cover mapping

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材料科学与工程：中英文版 2009年第12期3卷 26-31页

作者： Lim Hwee-San mohd zubir mat Jafr Khiruddin Abdullah Faez Hassan Nasirun mohd Saleh School of Physics University Science Malaysia Penang 11800 Malaysia

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