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RISS 인기검색어
- 검색키워드
- 저자 : I. A. Balogun (검색결과 4 건)
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A hybrid approach for monitoring future thermal environment in tropical areas
I. A. Balogun,K. A. Ishola 대한공간정보학회 2018 Spatial Information Research Vol.26 No.2
The manifestation of urban heat, due to changes in the surface physical components, is a well recognized example of man’s alteration of the natural environment. In this study, an attempt was made to project the future urban thermal changes by integrating a statistical approach with remote sensing techniques. Landsat observed TM, ETM?, and TIRS/OLI data for the periods 1986, 2000, and 2014 were used to examine the spatio-temporal changes in land surface temperature associated with urbanization process in the tropical City of Akure, Nigeria. Quantitative analysis on the past and future (2028 and 2042) land surface temperature (LST) impacts of urban land cover change was carried out using a hybrid Cellular Automata/Markov (CA_Markov) model and a step-wise multiple regression model. The result of the projected LST ranged from 19.79 to 40.97 C in 2028, and from 20.68 to 44.15 C for 2042. It was found that there was no significant increase in the hybrid CA_Markov projected LST in the City centres when compared with earlier years. However, the sub-urban and rural areas that are undergoing rapid urbanisation processes, as confirmed in the literature, have been observed to transit from a low and medium to high thermal zones in 2028 and 2042.
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Sola-Ojo, F.E,Afolabi-Balogun, N.B,Adeniyi C.A,Adeyemi, K.D,Ayorinde, K.L,Alli, O.I,Oni, O.A,Okeke, C.U,Momoh E.O,Adewara, J,Abdulkareem, I 한국동물유전육종학회 2021 한국동물유전육종학회지 Vol.5 No.2
Sexing of birds at early age is very important for efficient selection and breeding; while characterization and taxonomic identification is relevant in conservation of birds’ genetic resources. This study used the genomic DNA of ten (10) guinea fowl keets to determine their sex using agarose gel electrophoresis and sequencing with chromo helicase DNA (CHD) binding genes, they were also characterize taxonomically using 12S rRNA mitochondria genes. The results of this study shows a double band (ZW) for females and a single band (W) for males under Agarose gel electrophoresis view, the Guinea fowl keets sequenced showed some deletions and were closer to Gallus_CHD12 in the phylogenetic tree. The Taxonomic classification result shows that the sequenced guineafowl keets were most related to the Numida meleagris 12S mitochondrial ribosomal RNA. This study corroborate the fact sex of guineafowl keet can be easily identified at genomic DNA level and they can be characterized taxonomically using the 12SrRNA mitochondrial genes.
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Investigation of gamma radiation shielding capability of two clay materials
S.F. Olukotun,S.T. Gbenu,F.I. Ibitoye,O.F. Oladejo,H.O. Shittu,M.K. Fasasi,F.A. Balogun 한국원자력학회 2018 Nuclear Engineering and Technology Vol.50 No.6
The gamma radiation shielding capability (GRSC) of two clay-materials (Ball clay and Kaolin)of SouthwesternNigeria (7.49 N, 4.55 E) have been investigated by determine theoretically and experimentallythe mass attenuation coefficient, m/r (cm2g 1) of the clay materials at photon energies of 609.31, 1120.29,1173.20, 1238.11, 1332.50 and 1764.49 keV emitted from 214Bi ore and 60Co point source. The massattenuation coefficients were theoretically evaluated using the elemental compositions of the claymaterialsobtained by Particle-Induced X-ray Emission (PIXE) elemental analysis technique as inputdata for WinXCom software. While gamma ray transmission experiment using Hyper Pure Germanium(HPGe) spectrometer detector to experimentally determine the mass attenuation coefficients, m/r(cm2g 1) of the samples. The experimental results are in good agreement with the theoretical calculationsof WinXCom software. Linear attenuation coefficient (m), half value layer (HVL) and mean free path(MFP) were also evaluated using the obtained m/r values for the investigated samples. The GRSC of theselected clay-materials have been compared with other studied shielding materials. The cognizance ofvarious factors such as availability, thermo-chemical stability and water retaining ability by the claysamplescan be analyzed for efficacy of the material for their GRSC.
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Neutron-shielding behaviour investigations of some clay-materials
S.F. Olukotun,Kulwinder Singh Mann,S.T. Gbenu,F.I. Ibitoye,O.F. Oladejo,Amit Joshi,H.O. Tekin,M.I. Sayyed,M.K. Fasasi,F.A. Balogun,Turgay Korkut 한국원자력학회 2019 Nuclear Engineering and Technology Vol.51 No.5
The fast-neutron shielding behaviour (FNSB) of two clay-materials (Ball clay and Kaolin)of SouthwesternNigeria (7.49 N, 4.55 E) have been investigated using effective removal cross section, SRðcm 1Þ, massremoval cross section, SR=rðcm2g 1Þ and Mean free path, l (cm). These parameters decide neutronshielding behaviour of any material. A computer program - WinNC-Toolkit has been used for computationof these parameters. The toolkit evaluates these parameters by using elemental compositions anddensities of samples. The proficiency of WinNC-Toolkit code was probe by using MCNPX and GEANT4 tomodel fast neutron transmission of the samples under narrow beam geometry, intending to representthe actual experimental setup. Direct calculation of effective removal cross section (cm 1) of the sampleswas also carried out. The results from each of the methods for each types of the studied clay-materials(Ball clay and Kaolin) shows similar trend. The trend might be the fingerprint of water content retainedin each of the samples being baked at different temperature. The compositions of each sample have beenobtained by Particle-Induced X-ray Emission (PIXE) technique (Tandem Pelletron Accelerator: 1.7 MV,Model 5SDH). The FNSB of the selected clay-materials have been compared with standard concrete. Thecognizance of various factors such as availability, thermo-chemical stability and water retaining ability bythe clay-samples can be analyzed for efficacy of the material for their FNSB.
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