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Search Results: 1 - 10 of 317168 matches for " Dornyak O. R. "
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MATHEMATICAL MODELLING OF HEAT AND MASS TRANSFER DURING ADSORPTION-CONTACT DRYING OF CERAMIC MATERIALS (COMPUTING EXPERIMENT Математическое моделирование тепло- и массопереноса при адсорбционно-контактной сушке керамических материалов (вычислительный эксперимент)
Dornyak O. R.,Al' Sarradzhi S. H.,Usachev A. M.,Shmitko E. I.
Polythematic Online Scientific Journal of Kuban State Agrarian University , 2013,
Abstract: One-temperature limited version of the general model of adsorption-contact drying for the ceramic brick is considered. Numerical modeling of heat and mass transfer in the donor and the acceptor samples for one-dimensional approach is carried out. It is shown, in particular, that the moisture diffusion coefficient of material in the contact zone can vary significantly due to changes in the conditions for liquid-phase transfer
MATHEMATICAL MODELLING OF HEAT AND MASS TRANSFER DURING ADSORPTION-CONTACT DRYING OF CERAMIC MATERIALS (MATHEMATICAL MODEL) Математическое моделирование тепло- и массопереноса при адсорбционно-контактной сушке керамических материалов (математическая модель)
Dornyak O. R.,Usachev A. M.,Shmitko E. I.,Al' Sarradzhi S. H.
Polythematic Online Scientific Journal of Kuban State Agrarian University , 2013,
Abstract: The mathematical model of heat and mass transfer during adsorption-contact drying of ceramic bricks within the framework of the mechanics of multiphase systems is constructed
Imperatives of Health Psychologist in the Control and Management of HIV/AIDS in Sub-Saharan Africa  [PDF]
George O. Ayenigbara, S. O. Olowolabi, R. O. Adeleke
World Journal of AIDS (WJA) , 2014, DOI: 10.4236/wja.2014.42021
Abstract:

The paper studied the imperatives of health psychologists in the control and management of HIV/ AIDS. HIV/AIDS is a relatively new disease, but has caused more deaths than any other disease in human history, and there is no known cure yet. Even though, HIV/AIDS is a death sentence, experts agreed that early detection, and early commencement of treatment may prolong the life of the patients, and that early detection may prevent or reduce the transmission of the virus. Early detection, commencement of treatment, and compliance with medical advice are the responsibilities of the health psychologist. This paper therefore, concludes that health psychologist is indispensable in effective control, and management of HIV/AIDS, and so recommends that awareness be created on the roles of health psychologists in this regard, through health education.

Empirical Determination of the Tolerable Sample Size for Ols Estimator in the Presence of Multicollinearity (ρ)  [PDF]
O. O. Alabi, T. O. Olatayo, F. R. Afolabi
Applied Mathematics (AM) , 2014, DOI: 10.4236/am.2014.513180
Abstract:

This paper investigates the tolerable sample size needed for Ordinary Least Square (OLS) Estimator to be used when there is presence of Multicollinearity among the exogenous variables of a linear regression model. A regression model with constant term (β0) and two independent variables (with β1 and β2 as their respective regression coefficients) that exhibit multicollinearity was considered. A Monte Carlo study of 1000 trials was conducted at eight levels of multicollinearity (0, 0.25, 0.5, 0.7, 0.75, 0.8, 0.9 and 0.99) and sample sizes (10, 20, 40, 80, 100, 150, 250 and 500). At each specification, the true regression coefficients were set at unity while 1.5, 2.0 and 2.5 were taken as the hypothesized value. The power value rate was obtained at every multicollinearity level for the aforementioned sample sizes. Therefore, whether the hypothesized values highly depart from the true values or not once the multicollinearity level is very high (i.e. 0.99), the sample size needed to work with in order to have an error free estimation or the inference result must be greater than five hundred.

In-Vitro Metabolite Colonic Production from Otili (Sphenostylis stenocarpa) as Influenced by Selected Gastrointestinal Microbes  [PDF]
O. A. Awoyinka, T. R. Omodara, F. C. Oladele, O. O. Aina, O. E. Ajayi
Advances in Bioscience and Biotechnology (ABB) , 2018, DOI: 10.4236/abb.2018.911041
Abstract: In human nutrition, dietary fibers are un-degradable by mammalian enzymes, and are therefore potentially available for fermentation by micro-organisms living in the gastrointestinal tract. It is thought that these fermentable carbohydrates affect fermentation by stimulating the growth or metabolism of specific bacterial species, which are potentially beneficial for health. Hence in this study three gut associated microbes—Escherichia coli, Bacillus subtilis, and Lactobacillus acidophilus were made to ferment the non-digestible fraction of OtiliSphenostylis stenocarpa, a well-established underutilized wild bean with high economic importance. After 18 hours’ fermentation period short chain fatty acids (SCFAs) and medium chain fatty acids (MCFAs) were detected and evaluated by GC-MS analysis. Metabolic products were relatively dependent on the fermenter. This present study affirmed butyric acid as the main SCFAs after 18 hours’ fermentation. The clinical significance of thirteen other MCFAs detected and quantified was also explored thus conferring a valuable prebiotic on Otili.
In-Vitro Measurement of pH and Antioxidant Capacity during Colonic Fermentation of Selected Underutilized Wild and Edible Beans  [PDF]
O. A. Awoyinka, T. R. Omodara, F. C. Oladel, O. O. Aina, O. Akinluyi
Advances in Microbiology (AiM) , 2018, DOI: 10.4236/aim.2018.812065
Abstract: Human gut flora-mediated non-digestible fraction of wild edible and common edible was observed for pH at every 6 hours regime. The antioxidant ability was measured up to 18 hours of fermentation with different associated gut microbes. Changes in pH provide an overview of the fermentation process. In the in-vitro study of antioxidant activity by DPPH test, anti-oxidants values showed differences, depending on the substrate and microbial fermenters used for fermentation. At first 6 hours interval, it was observed that the wild bean-Feregede fermented by Enterococcus feacalis exerts the highest antioxidant capacity of 0.0043 Cathechin equivalents. It also exerts lowest antioxidant capacity of 0.0034 Cathechin equivalents after 18 hours fermentation. These data provided preliminary evidence that consumption of beans diet such as the wild bean—Otili, Feregede, pakala and edible bean—oloyin is limiting factor to liberation of antioxidant components during the gastrointestinal digestion. Thus, disruption of normal cellular homeostasis by redox signaling may result in the development of various gastrointestinal pathological conditions, including inflammatory bowel diseases.
Processing-Microstructure Relationships in the Plasma Electrolytic Oxidation (PEO) Coating of a Magnesium Alloy  [PDF]
R. O. Hussein, D. O. Northwood, X. Nie
Materials Sciences and Applications (MSA) , 2014, DOI: 10.4236/msa.2014.53017
Abstract:

In the plasma electrolytic oxidation (PEO) coating of light metal alloys, changing the electrical parameters and electrolytic composition can change the discharge behaviour and, ultimately, the thickness, surface morphology and porosity of the coating. In the present study a combination of cathodic and anodic current pulses with suitable Ton and Toff periods were used to control the porosity and other structural defects of PEO coatings of an AM60B magnesium alloy. In order to investigate the effect of a current mode on the plasma discharge behaviour and coating microstructure during the PEO treatment of magnesium alloy, the emission intensities of six different spectral lines from the plasma species were recorded simultaneously as a function of both time and current mode using optical emission spectroscopy (OES) system. The fluctuations in signal intensities and temperature during the coating process reflect differences in location of both the discharge initiation, and discharge type. The coating surface morphology and microstructure that are obtained can be linked to the plasma discharge behavior. These results are discussed in relation to the discharge behaviour, and how such changes in discharge behaviour relate to the coating mechanisms.

Nutritional and Sensory Evaluation of Rice-Based Masa Enriched with Soybean and Crayfish  [PDF]
Folake O. Samuel, Oluwaseun R. Ishola, Bolanle O. Otegbayo
Food and Nutrition Sciences (FNS) , 2015, DOI: 10.4236/fns.2015.62024
Abstract: Masa is a cereal based snack made from rice, maize or millet. It is popularly consumed in the northern regions of Nigeria. The objective of this work was to assess the nutritional and sensory properties of the rice-Masa, enriched with soybean and crayfish. The enriched rice-Masa produced were labelled sample A (100% rice), sample B (rice: soybean blend (80:20), sample C (rice: crayfish blend (80:20) and sample D (rice: soybean: crayfish (80:10:10). The proximate and mineral composition was evaluated according to standard methods. Anti-nutrient content was also determined. Sensory evaluation was carried out to assess the acceptability of the enriched rice-Masa. The chemical analysis showed that protein, fibre, iron, zinc and vitamin A and beta carotene contents were highest in sample D with values 8.35 (±0.08) g/100g, 1.08 (±0.02) g/100g, 2.82 (±0.03) mg/100g, 4.20 (±0.03) mg/100g, 602.3 (±1.28) μg/100g and 420.2 (±0.98) μg/100g respectively, while calcium was highest in sample C with a value of 27.34 (±0.06) mg/100g. Moisture and ash contents increased from 47.4 (±0.50) g/100g to 50.9 (±0.80) g/100g and 0.40 (±0.01) g/100g to 1.15 (±0.01) g/100g respectively, while carbohydrate and energy contents decreased from 28.1 (±0.03) g/100g to 21.9 (±0.04) g/100g and 308.42 kcal/100g to 285.64 kcal/100g respectively. The sensory evaluation showed that with regards to taste, aroma, texture and overall acceptability, the sample enriched with soybean was more preferred to that enriched with crayfish, or a combination of both. Enrichment of Masa could contribute to improvement of nutritional status if promoted as a nutritious, healthy indigenous snack not only where Masa is already widely consumed, but also in other parts of Nigeria where it has not found wide acceptance.
Exploring the Potentials of Tailings of Bukuru Cassiterite Deposit for the Production of Iron Ore Pellets  [PDF]
O. K. Abubakre, Y. O. Sule, R. A. Muriana
Journal of Minerals and Materials Characterization and Engineering (JMMCE) , 2009, DOI: 10.4236/jmmce.2009.85032
Abstract: Cassiterite ore was sourced from Dogo-Na-Hawa, in Bukuru, Jos South Local Government of Plateau State, Nigeria. The ore was analyzed as mined and its various constituents noted. Previous study has shown considerable iron ore composition of the deposit. The present study entails the separation and analysis of magnetic mineral (mostly iron ore) from the ore. The beneficiated iron ore was pelletized using the facilities of the Nigerian Metallurgical Development Centre (NMDC), Jos. The pellets so produced were subjected to various tests such as drop resistance, green compressive strength, dry compressive strength at 900℃, tumbler resistance, micro porosity and indurations compressive strength at 1100℃. The results indicated Bukuru cassiterite contains sufficiently high grade of iron ore that could be beneficiated for iron production. The pellets produced are of good quality and could be utilized for iron and steel making.
Relationship between C-Reactive Protein, White Blood Cell Count and Metabolic Syndrome in Nigerians with Type 2 Diabetes Mellitus  [PDF]
D. O. Soyoye, R. T. Ikem, B. A. Kolawole, R. A. Bolarinwa, O. O. Amjo, O. T. Yusuff, F. A. Owolabi, O. O. Ezekpo
Journal of Diabetes Mellitus (JDM) , 2017, DOI: 10.4236/jdm.2017.73017
Abstract: Background: Presence of metabolic syndrome (MS) in people with diabetes confers increased cardiovascular and diabetes-specific micro- and macrovascular complications. The pathogenic pathways for metabolic syndrome are still issues for discussion especially in some special groups like those with type 2 diabetes mellitus (T2DM). Recent evidences suggest that inflammation may play a key role in MS. This study assessed the relationship between MS (and its component risks) and markers of inflammation (high-sensitivity C-reactive protein {hs-CRP} and white blood cells {WBC}). Methods: A cross-sectional study involving 108 patients with T2DM. Anthropometric measurements and clinical examination were conducted. Blood sample was collected for hs-CRP, WBC, glycated haemoglobin etc. Metabolic syndrome was defined using the International Diabetes Federation criteria. Ethical approval was granted and informed consent was obtained from participants. Results: Mean age of male and female participants were 58.00 ± 7.01 years and 55.48 ± 8.35 years respectively (p = 0.092). Eighty-two (75.9%) participants had metabolic syndrome. Median values of hs-CRP and total WBC were 0.89mg/L and 5.73 x103/mm3 respectively. On correlation, hs-CRP showed statistically significant association with waist circumference (r = 0.194; p = 0.044), fasting plasma glucose (r = 0.191; p = 0.048) and serum triglycerides (p = 0.226; r = 0.019). There was no statistically significant association between WBC and the metabolic components. Conclusion
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