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Birds' species diversity measurement of Uchali Wetland (Ramsar site) Pakistan
Taofik Oyedele Dauda,Md. Hafiz Baksh,Anuar Mohd. Sah Shahrul 국립중앙과학관 2017 Journal of Asia-Pacific Biodiversity Vol.10 No.2
We carried out this study to evaluate bird species diversity and to model bird species abundance using Uchali Wetland, Pakistan (32°33′N, 72°01′E). Data obtained were subjected to summary statistics, Simpson diversity, Shannon evenness index, and rank abundance curve and model. The watershed supports 25,361 birds of 47 species, which is appreciably less than the number of bird species supported by the same wetland in the past year (1991). Total evenness could be obtained as the ranks increases and this differed annually. Evenness index (EI) analysis showed that EI for 2011 was 0.0231, for 2012, it was 0.02, for 2013, it was 0.01, and for the annual mean, it was 0.046 indicating functional abundance of the species. Bird species diversity measurement could be enhanced by the use of the modified rank–abundance curve and would clearly present the true picture of the bird species abundance.
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Mahjouri-Samani, Masoud,Liang, Liangbo,Oyedele, Akinola,Kim, Yong-Sung,Tian, Mengkun,Cross, Nicholas,Wang, Kai,Lin, Ming-Wei,Boulesbaa, Abdelaziz,Rouleau, Christopher M.,Puretzky, Alexander A.,Xiao, K American Chemical Society 2016 Nano letters Vol.16 No.8
<P>Defect engineering has been a critical step in controlling the transport characteristics of electronic devices, and the ability to create, tune, and annihilate defects is essential to enable the range of next-generation devices. Whereas defect formation has been well-demonstrated in three-dimensional semiconductors, similar exploration of the heterogeneity in atomically thin two-dimensional semiconductors and the link between their atomic structures, defects, and properties has not yet been extensively studied. Here, we demonstrate the growth of MoSe2-x single crystals with selenium (Se) vacancies far beyond intrinsic levels, up to similar to 20%, that exhibit a remarkable transition in electrical transport properties from n- to p-type character with increasing Se vacancy concentration. A new defect-activated phonon band at similar to 250 cm(-1) appears, and the A(1g) Raman characteristic mode at 240 cm(-1) softens toward similar to 230 cm(-1) which serves as a fingerprint of vacancy concentration in the crystals. We show that post-selenization using pulsed laser evaporated Se atoms can repair Se-vacant sites to nearly recover the (p)roperties of the pristine crystals. First-principles calculations reveal the underlying mechanisms for the corresponding vacancy induced electrical and optical transitions.</P>
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Co-integration analysis of captureerecapture method in toad, Phrynoidis aspera (Gravenhorst, 1829)
Anuar Mohd Sar Shahrul,Taofik Oyedele Dauda,C.C. Hong,Evan Quah,Taiwo Omodele 국립중앙과학관 2019 Journal of Asia-Pacific Biodiversity Vol.12 No.1
The Asian giant toad, Phrynoidis aspera, research is faced mainly with twin challenges of conservationand efficient sampling techniques for research purposes. This research is therefore conducted to assessthe co-integration feature of the captureerecapture methods and to evaluate both long- and short-termeffect of capture on the recapture of P. aspera using Titi Kerawang waterfall (N05 24.23/E100 13.41/),Teluk Bahang. Toads encountered in the study area were caught and marked using PIT tags weekly. Dataobtained were subjected to summary statistics (mean, standard error, and variance), correlogram, crosscorrelogram, stationary test, and exogenous and endogenous variable determination. Mean Asian gianttoad recaptured fell between three for the 2nd week and 25 for the 14th week. For the capture, the rangewas between zero for the 12th week and nine for the 3rd week, while the 1st capture was 12 toads. Therewas no visible similarity in the variances of the toad indices indicated by the correlogram of both captureand recapture as well as their cross-correlogram. The cross-correlogram ranged between 0.6665 and0.4029. From these results, randomness of data as well as their independence can thus be established. Also, the results portray that the summary statistics does not present any visible stationary trend in bothtoad capture and recapture. The raw data can therefore be said to be nonstationary (that is variance oftoad capture/recapture in a week, xt is not dependent on preceding week, xt-1). The augmented DickeyeFuller statistics of both capture (0.97294 to 3.92035) and recapture (1.13288 to 4.00443) indicatedstrong evidence that both capture and recapture series of the nontransformed data on the long run areI(1). The short-run co-integration according to this study contrast with the long-run co-integration.
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Lukumon Adeoti,Oluwakemi Y. Adesanya,Kayode F. Oyedele,Itsemode P. Afinotan,Ayo Adekanle 한국지질과학협의회 2018 Geosciences Journal Vol.22 No.1
Seismic inversion has been widely practiced in the oil and gas industry because it generates broad bandwidth of impedance data which maximizes vertical resolution and minimizes tuning effects. The lack of accurate prediction of lithology and fluid content of subtle features identified in seismic data acquired over the Sandfish field, Niger Delta, Nigeria necessitated the use of seismic inversion. In this paper, simultaneous seismic inversion is adopted to integrate seismic and well data for quantitative interpretation and uncertainty assessment of the subsurface reservoirs in the Sandfish field. Three Sandfish (Sfn) wells with the required petrophysical logs, check-shot data, high quality 3D seismic data of five angle stacks (6–12°, 12–18°, 18–26°, 26–32°, and 32– 42°) were used for the analysis. A feasibility study including cross-plots of petrophysical and elastic properties from well data was first carried out to establish rock property relationships in the interval of interest. Biot-Gassmann fluid substitution analysis was also used to reveal sensitivity of rock properties to pore-fill type. Low frequency (0–2 Hz) models were generated from interpolation of highcut- filtered P-sonic, S-sonic, and density logs guided by interpreted seismic horizons. The low frequency models were used to broaden the spectrum to estimate elastic volumes. The five partial angle stacks were simultaneously inverted using Jason’s Rock-Trace® inversion software which iterated trial inversions until the model sufficiently matched the seismic data. The inverted P-impedance (ZP), Simpedance (ZS), and density (ρ) were used to derive Poisson’s ratio (σ), volume of sand (Vsand), lambda-rho (λρ), and mu-rho (μρ). The cross-plot of λρ with μρ from well data looks similar to that from inverted results. Sands and shales are discriminated on the basis of sands having low values of μρ. Hydrocarbon-bearing sands are differentiated from water-bearing sands and shales on the basis of having lowest values of λρ. The Biot-Gassmann fluid substitution analysis at reservoir N-01 reveals typical class III amplitude variation with angle (AVA) responses for low-impedance hydrocarbon sands. The lithology and fluid prediction maps extracted from Vsand and σ at the N-01 seismic horizon show variation in lithology and fluid types for the entire volume. The inversion products reveal heterogeneities in the reservoirs away from well control validated by a blind well test. Hence, the study shows that rock-property model from a simultaneous inversion is an effective predictive tool for lithology and fluid types which in turn can guide well placement and predict reservoir development in the field of study.
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