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Search Results: 1 - 10 of 512223 matches for " A. I. Obike "
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Mild Steel Corrosion Mitigation in Sulphuric Acid via Benign Isolated Phytochemicals from Viscum album  [PDF]
N. E. Nya, A. I. Ikeuba, P. C. Okafor, B. U. Ugi, V. M. Bassey, A. I. Obike
Journal of Materials Science and Chemical Engineering (MSCE) , 2018, DOI: 10.4236/msce.2018.64014
Abstract: We present the evaluation of four Eco-friendly corrosion inhibitors for the corrosion mitigation of mild steel in acid media. The corrosion inhibition of mild steel by ethanol extracts from Viscum album (EEVA) and some of its isolated phytochemical components; phytates extract (PEVA), saponins extract (SEVA), and flavonoids extracts (FEVA) have been studied using gravi-metric and gasometric techniques. The results of the study reveal that these ecofriendly and benign extracts function as good inhibitors for mild steel corrosion in sulphuric acid. Inhibition efficiency of the extracts increases with inhibitor concentration and temperature rise. The trend of inhibition efficiency in lower inhibitor concentration is EEVA > PEVA > SEVA > FEVA and at higher concentration, the order was SEVA > PEVA > EEVA > FEVA. The presence of the plant extracts decreases the corrosion activation energy in the solution which indicates chemical adsorption mechanism. The adsorption of the components of the extracts is consistent with Temkin isotherm. The interaction between the isolated extracts is synergistic at lower inhibitor concentration and antagonistic at higher concentrations. The Kads values for PEVA and SEVA are higher than those of EEVA and FEVA. This implies that PEVA and SEVA are more efficiently adsorbed on the mild steel surface.
Poverty Reduction among Farmers in Nigeria: The Role of the National Directorate of Employment
K.C. Obike,O.O. Ukoha,C.U. Nwajiuba
Agricultural Journal , 2013,
Abstract: The study investigated the role of the National Directorate of Employment (NDE) in poverty reduction in Nigeria, using Abia State as a case study. Structured questionnaire was used to obtain information from 120 respondents, comprising 60 beneficiaries and 60 non-beneficiaries of the NDE services in the study area. Simple random sampling was adopted. The list of names of beneficiaries of NDE in Abia State and the list of names of farmers who registered with the Agricultural Development Programme (ADP) were the sampling frames for selecting the beneficiaries and non-beneficiaries of NDE services, respectively. The data collected were analyzed by the use of the Foster, Greer and Thobecke (F-G-T) measure of poverty and multiple regression analysis. The result of data analysis shows that credit, farming experience, children education and farm income were significant determinants of poverty for beneficiaries of NDE, while household size, farm income and children education were significant determinants of poverty for non- beneficiaries of NDE services
Comparison of Egg Production Performance and Egg Quality Traits of Pearl and Black Strains of Guinea Fowl in a Humid Rain-Forest Zone of Nigeria
O.M. Obike,U.K. Oke,K.E. Azu
International Journal of Poultry Science , 2011,
Abstract: Data on 272 eggs collected from Pearl (175 eggs) and Black (97 eggs) adult guinea fowl strains were analyzed to determine the egg production performance and egg quality characteristics of the birds. Data generated were analyzed using Students t-test. The external egg quality traits measured were egg weight, egg length, egg width, shell weight, shell thickness and egg shape index. Internal egg quality traits studied include egg mass, yolk weight, yolk height, yolk diameter, yolk index, albumen weight, albumen height and albumen diameter and albumen index. The production performance traits measured were egg number and Hen-Day Production (HDP). In addition, weekly body weight of the hens was also recorded. Egg number was significantly (p<0.05) different between the two strains. The mean values were 22.710.30 and 12.840.29, respectively for Pearl and Black. Although there was no significant difference (p>0.05) between HDP of the two strains, the Black strain had higher HDP in all the weeks except in weeks 1, 5 and 6. Among the internal traits, albumen diameter differed significantly (p<0.05) between Pearl and Black with mean values of 61.272.02 mm and 66.971.20 mm, respectively. Effect of strain was not observed for all the other egg traits measured. However, the significant difference (p<0.05) observed for egg number and albumen diameter between the strains suggests at least some degree of genetic dissimilarity, which implies that the strains could be used to improve egg production and egg quality characteristics of guinea fowl in the study region.
Lorentz Transform in Multi-Dimensional Space  [PDF]
I. A. Urusovskii
Journal of Modern Physics (JMP) , 2012, DOI: 10.4236/jmp.2012.311217
Abstract: It is shown that in Euclidean space with any number of spatial dimensions more than three, the Lorentz transform holds true if the proper time of each elementary particle is proportional to the length of its path in the extra-dimensional subspace, and all elementary particles move at the speed of light in the complete space. The six-dimensional treatment of the Coulomb force of interaction between two charges is given. The electric force is due to the motion of charges in the extra-dimensional subspace and is equal to the corresponding Lorentz force.
The Fractional Hydrogen Atom: A Paradigm for Astrophysical Phenomena  [PDF]
A. I. Arbab
Journal of Modern Physics (JMP) , 2012, DOI: 10.4236/jmp.2012.311215
Abstract: We have found that fractional principal quantum numbers are permitted in hydrogen atom which yield the conditions for neutron and white dwarf stars evolution. The number densities of neutron and white dwarf stars reveal that these systems have the maximal conductivity of 1.37×1010Ω-1m-1. They are giant perfect conductors at very high temperature and magnetic field.
Efficiency of Different Vaccination Strategies for Childhood Diseases: A Simulation Study  [PDF]
I. A. Moneim
Advances in Bioscience and Biotechnology (ABB) , 2013, DOI: 10.4236/abb.2013.42028
Abstract:

Vaccination strategies are designed and applied to control or eradicate an infection from the population. This paper studies three different vaccination strategies used worldwide for many infectious diseases including childhood diseases. These strategies are the conventional constant vaccination strategy, the periodic step (pulse) vaccination strategy and finally the mixed vaccination strategy of both the constant and the periodic one. Simulation of the different vaccination programs is conducted using three parameter sets of measles, chickenpox and rubella. The Poincaré section is playing as a filter of our simulation results to show a wide range of possible behavior of our model. Critical vaccination level is been estimated from the results to prevent severe epidemics.

Assessment of Genetic Variability of 142 Sweet Sorghum Germplasm of Diverse Origin with Molecular and Morphological Markers  [PDF]
A. Lekgari, I. Dweikat
Open Journal of Ecology (OJE) , 2014, DOI: 10.4236/oje.2014.47034
Abstract:

Sorghum bicolor (L.) Moech is the fifth most important crop in the world. Recently, its agronomics and genetics have drawn interest among scientists. Sweet sorghum, a variety of sorghum, may potentially become a bioenergy source because of the high sugar content in its juicy stems. Exploring the diversity of sweet sorghum around the world is important to the development and improvement of the crop as an energy source. In exploring the diversity of sweet sorghum, three types of markers (simple sequence repeats [SSR], sequence-related amplified polymorphisms [SRAP], and morphological markers) are used on 142 sweet sorghum accessions from around the world. The accessions show a high significance (P < 0.05) for all the morphological traits measured. The morphological markers cluster the accessions into five groups based primarily on plant height (PH), anthesis data (AD), and moisture content (ML), with the principal component analysis (PCA) showing these traits to explain 92.5% of the total variation. The furthest accessions were PI571103 from Sudan, and N99 from the United States. The Nei’s genetic standard distances ranged from 0.024 to 1.135 and 0.078 to 0.866 for SSR and SRAP, respectively. As expected, accessions of the same origin or breeding history had the lowest genetic distance (e.g. Mokula and Marupantse, both from Botswana; NSL83777 and NSL83779 from Cameroon). Neighbor joining clusters the sweet sorghum accessions into five major groups using SSR and four major groups using SRAP, based on their origin, or breeding history. The three marker types complement each other, and the presence of accessions of different origins across clusters indicate similar genetics, and evidence of germplasm movement between countries.

Determination of Molecular Mass of Strong Acids by Differential Temperature Model (DTM) Using H3PO4 and HBF4 for Classical Demonstration  [PDF]
I. A. Akpan
Journal of Materials Science and Chemical Engineering (MSCE) , 2015, DOI: 10.4236/msce.2015.36007
Abstract:

A new chemical hypothesis based on the differential temperature model (DTM) for estimation of molecular masses of some strong acids (H2SO4, HNO3 and HCl) in solutions have previously been propounded and tested theoretically and analytically by the author. The results were published in the Bulletin of Pure and Applied Sciences–Chemistry in 2012. The changes in temperature following various dilutions of the acids were found to be proportional to their molecular properties. The new chemical hypothesis and model is hereby tested on H3PO4 and HBF4 and their exact molecular masses have been evaluated analytically and theoretically. The validity of the hypothesis and the model is hereby presented for chemical proof and adoption to theory by chemists.

Multidimensional Treatment of the Observed Dependence of the Speed of Photon on Its Energy  [PDF]
I. A. Urusovskii
Journal of Modern Physics (JMP) , 2015, DOI: 10.4236/jmp.2015.69126
Abstract: Agreed with the Lorentz transformations, a multidimensional treatment of motion of elementary particles with the fundamental speed (upper limit of the speed of light) in six-dimensional Euclidean space in Compton neighborhood of observed three-dimensional space is given. Thereby it is supposed that the proper time of any elementary particle is proportional to the path traversed by it in the extra space. By the available experimental data [1], these suppositions are allowed to find the photon proper energy, 1.44 × 10-5 eV. It is shown that the difference between the fundamental speed and speed of high-energy photons, in the projection on the three-dimensional space, is negligibly small.
Fine Structure Calculations of Atomic Data for Ar XVI  [PDF]
A. I. Refaie
Journal of Modern Physics (JMP) , 2015, DOI: 10.4236/jmp.2015.611163
Abstract: Fine structure energy levels, wavelengths, log gf and allowed transition probabilities (E1) have been calculated for Lithium-like Ar XVI. The optimized electrostatic parameters by a least square approach, have been used in the calculation to include the configuration interaction and relativistic effects. A total number of 69 Ar XVI levels having total angular momenta, 1/2 ≤ J ≤ 9/2 of even and odd parities, orbital angular momenta 2 ≤ l ≤ 4, with 546 E1 transitions for 6 ≤ n ≤ 10 are considered using the relativistic effect in the Breit-Pauli method, where n is the principal quantum number. A comparison is made with the available results in literature.
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