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Anas, M.,Han, D.,Mahmoud, K.,Park, H.,Abdel-Wahab, A. Pergamon 2016 Materials science in semiconductor processing Vol.41 No.-
In this study, photocatalytic degradation of methyl orange (MO) as an example of organic dye was investigated using different wt% Pd-loaded and N-doped P-25 titanium dioxide (TiO<SUB>2</SUB>) nanoparticles, as example of metal and nonmetal-doped TiO<SUB>2</SUB>, respectively. The Pd-loaded and N-doped TiO<SUB>2</SUB> photocatalysts were prepared by post-incorporation method using K<SUB>2</SUB>PdCl<SUB>4</SUB> and urea, respectively, as precursors. A variety of surface analysis techniques were used for characterization of surface and functional group while using ultraviolet/visible (UV-vis) analysis for monitoring photocatalytic degradation of MO. Kinetic parameters were obtained using Langmuir-Hinshelwood model to determine the degradation rate constants. It was found that the metal-loaded titanium dioxide degraded MO in water at a higher rate than did non-metal-loaded titanium dioxide fabricated by using the post-synthesis method. Also, the pure P25-TiO<SUB>2</SUB> degraded MO more than N-doped TiO<SUB>2</SUB> because of decreased surface area by particle agglomeration after being made by the post-incorporation method.
Arivazhagan S.,Naseer K.A.,Mahmoud K.A.,Libeesh N.K.,Arun Kumar K.V.,Naga Kumar K.ChV.,Sayyed M.I.,Alqahtani Mohammed S.,Shiekh E. El,Khandaker Mayeen Uddin 한국원자력학회 2023 Nuclear Engineering and Technology Vol.55 No.9
The practice of identifying the potential zones for mineral exploration in a speedy and low-cost method includes the use of satellite imagery analysis as a part of remote sensing techniques. It is challenging to explore the iron mineralization of a region through conventional methods which are a time-consuming process. The current study utilizes the Hyperion satellite imagery for mapping the iron mineralization and associated geological features in the Irikkur region, Kannur, Kerala. Along with the remote sensing results, the field study and laboratory-based analysis were conducted to retrieve the ground truth point and geochemical proportion to verify the iron ore mineralization. The MC simulation showed for shielding properties indicate an increase in the linear attenuation coefficient with raising the Fe2O3þSiO2 concentrations in the investigated rocks where it is varied at 0.662 MeV in the range 0.190 cm1 - 0.222 cm1 with rising the Fe2O3þSiO2 content from 57.86 wt% to 71.15 wt%. The analysis also revealed that when the g-ray energy increased from 0.221 MeV to 2.506 MeV, sample 1 had the largest linear attenuation coefficient, ranging from 9.33 cm1 to 0.12 cm1 . Charnockite rocks were found to have exceptional shielding qualities, making them an excellent natural choice for radiation shielding applications.
K.A. Mahmoud,M.I. Sayyed,O.L. Tashlykov 한국원자력학회 2019 Nuclear Engineering and Technology Vol.51 No.7
The mass attenuation coefficient for eight rock samples having different chemical composition was simulated using the MCNP 5 code in energy range . Moreover, the for the studied rock samples was computed theoretically using XCOM database. The comparison between simulated and computed data for all selected rock samples showed a good agreement with differences varied between 0.01 and 8%. The highest was found for basalt rocks M2 and M1 and the lowest one is reported for limestone rocks Dike. The simulated values of the then were used to calculate other important shielding parameters such as the mean free path, effective electron density and effective atomic number. The exposure buildup factor was also computed for the selected rocks with the contribution of G-P fitting parameters and the highest EBF attended by the basalt sample Sill and varied between 1.022 and 744 in the energy range between but the lowest EBF achieved by basalt sample M2 and varied between 1.017 and 491 in the same energy range.
Mahmoud, K.A.,El-Agawany, F.I.,Tashlykov, O.L.,Ahmed, Emad M.,Rammah, Y.S. Korean Nuclear Society 2021 Nuclear Engineering and Technology Vol.53 No.11
The mechanical features evaluated theoretically using Makishima-Mackenzie's model for glasses xBaO-(50-x) PbO-50P<sub>2</sub>O<sub>5</sub> where x = 0, 5, 10, 15, 20, 30, 40, and 50 mol%. Wherefore, the elastic characteristics; Young's, bulk, shear, and longitudinal modulus calculated. The obtained result showed an increase in the calculated values of elastic moduli with the replacement of the PbO by BaO contents. Moreover, the Poisson ratio, micro-hardness, and the softening temperature calculated for the investigated glasses. Besides, gamma and neutron shielding ability evaluated for the barium doped lead phosphate glasses. Monte Caro code (MCNP-5) and the Phy-X/PSD program applied to estimate the mass attenuation coefficient of the studied glasses. The decrease in the PbO ratio has a negative effect on the MAC. The highest MAC decreased from 65.896 cm<sup>2</sup>/g to 32.711 cm<sup>2</sup>/g at 0.015 MeV for BPP0 and BPP7, respectively. The calculated values of EBF and EABF showed that replacement of PbO with BaO contents in the studied BPP glasses helps to reduce the number of photons accumulated inside the studied BPP glasses.
Mahmoud E. Bayoumy,Osman K. Abd El-Hady,Hussein A.M. Osman 대한수의학회 2006 Journal of Veterinary Science Vol.7 No.4
Acanthogyrus (Acanthosentis) tilapiae parasites were collected from the intestines of 300 fish belonging to three tilapia species sourced at the River Nile, Giza, Egypt. The proboscis of the parasite was characterized by three rows of hooks that curved towards the posterior of the body. The first row is supported by unmodified hooks. The parasite tegument has a series of alternative folds and a large number of pores. Sensory ganglia are located on the surface of the proboscis and body. Acanthogyrus (Acanthosentis) tilapiae provokes an aggressive host response indicated by hyperplasia of the intestinal goblet cells and focal eosinophil infiltrations. This acanthocephalan parasite shows a highly modified adaptation to its site of host infection.
Al-Saeedi F.H.F.,Sayyed M.I.,Kapustin F.L.,Al-Ghamdi Hanan,Kolobkova E.V.,Tashlykov O.L.,Almuqrin Aljawhara H.,Mahmoud K.A. 한국원자력학회 2022 Nuclear Engineering and Technology Vol.54 No.8
In the present work, untreated Iraqi sand with grain sizes varied between 100 and 200 mm was used to produce a colored glass sample that has shielding features against the low gamma-ray energy. Therefore, a weight of 70e60 wt % sand was mixed with 9e14 wt% B2O3, 8e10 wt% Na2O, 4e6 wt% of CaO, 3e6 wt% Al2O3, in addition to 0.3% of Co2O3. After melting and annealing the glass sample, the X-ray diffraction spectrometry was applied to affirm the amorphous phase of the fabricated glass samples. Moreover, the X-ray dispersive energy spectrometry was used to measure the chemical composition, and the MH-300A densimeter was applied to measure the fabricated sample's density. The Makishima-Makinzie model was applied to predict the mechanical properties of the fabricated glass. Besides, the Monte Carlo simulation was used to estimate the fabricated glass sample's radiation shielding capacity in the low-energy region between 22.1 and 160.6 keV. Therefore, the simulated linear attenuation coefficient changed between 10.725 and 0.484 cm1 , raising the gamma-ray energy between 22.1 and 160.6 keV. Also, other shielding parameters such as a half-value layer, pure lead equivalent thickness, and buildup factors were calculated
Mahmoud K.G.,Sayyed M.I.,Hashim S.,Almuqrin Aljawhara H.,El-Soad A.M Abu 한국원자력학회 2023 Nuclear Engineering and Technology Vol.55 No.4
In this study, halloysite nanoparticles-doped epoxy resin was synthesised using the casting method. The MH-300A density metre revealed that the density of the fabricated composites changed from 1.132 to 1.317 g/cm3 as the halloysite nanoparticle concentration increased. The Fourier transform infrared was recorded for the synthesised composites. Furthermore, the γ-ray shielding properties of the synthesised composites were evaluated using Monte Carlo simulation and a theoretical programme, XCOM. The linear attenuation coefficient of the epoxy resin increased by 43% (at γ-energy of 15 keV) and 14% (at γ-photon energy of 662 keV) when the concentration of the halloysite nanoparticles was increased from 0 wt% to 40 wt%, respectively.
( Yehia A. G. Mahmoud ),( Mohsen K. H. Ebrahim ),( Magda M. Aly ) 한국식물학회 2004 Journal of Plant Biology Vol.47 No.3
Laboratory and greenhouse experiments were conducted to assess the efficacy of Eucalyptus citriodora, 1pomoea carnea, Cuminum cyminum, Allium sativum and Hyoscyamus muticus leaf extracts, and Streptomyces exfloliatus (S) and Trichoderma harzianum (T) for controlling Botrytis fabae causing chocolate spot disease of faba bean. Laboratory study supported the use of E. citriodora (Ex 1) and I. carnea (Ex 2) extracts than the others for controlling the growth of B. fabae. S+T was the best for inhibiting spore germination followed by Ex 1 +Ex 2 after 8 h of testing, whereas Ex 1 +Ex 2 produced the lowest percent of germination after 16 h. After 4 days, the inhibiting order of the growth of B. fabae was S+T > Ex 1 +Ex 2 > T > Ex 2 > Ex 1= S. Greenhouse experiments showed the highest activities of peroxidase, catalase and pectinase in the infected plants. These activities were markedly reduced in healthy plants and widely changed by the biocontrol treatments. Applying biocontrol agents to the infected plants increased minerals (N, P, K and Mg), and both Chl biosynthesis and the photosynthetic activity, which in turn led to accumulation of metabolites. This served the plant to resist the detrimental effects of B. fabae on the plant growth and yield. In this concern, the efficiency of test biocontrol agents seemed to be in the order: T+S > Ex 1 +Ex 2 > T > S > Ex 2 > Ex.
Mohamed E. Mahmoud,Azza E.H. Abdou,Aziza K. Shehata,Heba M.A. Header,Ezzat A. Hamed 한국공업화학회 2018 Journal of Industrial and Engineering Chemistry Vol.57 No.-
Removal of Congo red was completed in 5–20 s using microwave-enforced sorption (MES) as a sustainable technique. Nano-γ-Al2O3 was covalently bonded with 3-chloropropyltrimethoxysilane to produce γ-Al2O3-SiCl nanosorbent via microwave-assisted approach. Congo red extraction by γ-Al2O3 and γ-Al2O3-SiCl were found 58.42% and 69.41% and increased to 66.13% and 81.47%, respectively using 5 and 20 s of microwave heating. The percentage extraction of Congo red (30 mg L−1) by γ-Al2O3-SiCl was increased from 46.21% to 83.61% upon increasing the pH from 1.0 to 10.0. Other controlling conditions were investigated and optimized. Excellent recovery of Congo red from wastewater was established in 20 s.
S. Arivazhagan,K.A. Naseer,K.A. Mahmoud,S.A. Bassam,P.N. Naseef Mohammed,N.K. Libeesh,A.S. Sachana,M.I. Sayyed,Mohammed S. Alqahtani,E. El Shiekh,Mayeen Uddin Khandaker Korean Nuclear Society 2023 Nuclear Engineering and Technology Vol.55 No.7
Hyperspectral data and its ability to explore the minerals and their associated rocks have a remarkable application in mineral exploration and lithological characterization. The present study aims to explore the radiation shielding aspects of the iron ore in Kerala with the aid of the Hyperion hyperspectral dataset. The reflectance-spectra obtained from the laboratory conditions as well as from the image show various absorptions. The results from the spectra are validated with geochemical data and GPS points. The Monte Carlo simulation employed to evaluate the radiation shielding ability. Raising the oxygen ions caused a noteworthy decrease in the µ values of the studied rocks which is accompanied by an increase in Δ<sub>0.5</sub> and Δ<sub>eq</sub> values. The Δ<sub>0.5</sub> and Δ<sub>eq</sub> values increased by factors of approximately 77 % with raising the oxygen ions between 44.32 and 47.57 wt.%. The µ values varies with the oxygen concentrations, where the µ values decreased from 2.531 to 0.925 cm<sup>-1</sup> (at 0.059 MeV), from 0.381to 0.215 cm<sup>-1</sup> (at 0.662 MeV), and from 0.279 to 0.158 cm<sup>-1</sup> (at 1.25 MeV) with raising the oxygen ions from 44.32 to 47.43 wt.%.