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Search Results: 1 - 10 of 317543 matches for " R.O. Salawu "
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Development in Sub-Saharan Africa: Overcoming the Digital Divide
Oyedokun Agbeja,R.O. Salawu
Information Technology Journal , 2007,
Abstract: In an increasingly digitalized world economy, there exists a digital gap between Sub-Saharan Africa and the rest of the world that translates into economic marginalization of the African region. Consequently, the following phases of development are crucial for the region: (1) the phase of massive digitalization during which the digital divide is bridged and (2) the phase of information and knowledge management in which information is systematically converted into knowledge and the latter into innovative-sustainable development. Information for conversion into knowledge is supplied by the first phase. The second phase is therefore existence dependent on the first. Therefore, the attainment of digitalized state is primary-sine qua non. The envisaged digitalized state can be actualized and consolidated with a combination of: (a) curriculum in computer education consisting of computer taxonomy, networking and ICTS in general for secondary and tertiary institutions but also aptly adoptable for informal groups and (b) establishment of multipurpose telecentres in rural areas and a diffusion of networks in urban centres. Once a steady digitalized state evidenced by uninterrupted connectivity to the internet is attained, the second phase can be realized. Without steady supply of electricity, however, sustainable development and competitive edge may be hard to come by in a world of fierce competition.
Upper esophageal sphincter pressure in patients with Chagas' disease and primary achalasia
Dantas, R.O.;
Brazilian Journal of Medical and Biological Research , 2000, DOI: 10.1590/S0100-879X2000000500009
Abstract: the most important component of the upper esophageal sphincter (ues) is the cricopharyngeal muscle. during the measurement of sphincter pressure the catheter passed through the sphincter affects the pressure value. in chagas' disease and primary achalasia there is an esophageal myenteric plexus denervation which may affect ues pressure. we measured the ues pressure of 115 patients with chagas' disease, 28 patients with primary achalasia and 40 healthy volunteers. we used a round manometric catheter with continuous perfusion and the rapid pull-through method, performed in triplicate during apnea. pressures were measured in four directions, and the direction with the highest pressure (anterior/posterior) and the average of the four directions were measured. the highest ues pressure in chagas' disease patients without abnormalities upon radiologic esophageal examination (n = 63) was higher than in normal volunteers (142.8 ± 47.4 mmhg vs 113.0 ± 46.0 mmhg, mean ± sd, p<0.05). there was no difference in ues pressure between patients with primary achalasia and patients with chagas' disease and similar esophageal involvement and normal volunteers (p>0.05). there was no difference between patients with or without esophageal dilation. in the group of subjects less than 50 years of age the ues pressure of primary achalasia (n = 21) was lower than that of chagas' disease patients with normal radiologic esophageal examination (n = 41), measured at the site with the highest pressure (109.3 ± 31.5 mmhg vs 149.6 ± 45.3 mmhg, p<0.01) and as the average of the four directions (64.2 ± 17.1 mmhg vs 83.5 ± 28.6 mmhg, p<0.05). we conclude that there is no difference in ues pressure between patients with chagas' disease, primary achalasia and normal volunteers, except for patients with minor involvement by chagas' disease, for whom the ues pressure at the site with the highest pressure was higher than the pressure of normal volunteers and patients with primary achalasia.
Theories and Concepts in Migration and Settlement Studies: The Case of the Coastal Yoruba
R.O. Ajetunmobi
The Social Sciences , 2013, DOI: 10.3923/sscience.2012.289.296
Abstract: The study of the Coastal Yorubaland as a regional group is of recent phenomenon. The traditional history of the various subgroups such as the Awori, Ilaje and Ijebu waterside is replete in theories and concepts of migration. The study of these theories and concepts in the settlement studies of the groups will enhance the knowledge of the Yoruba of the coastal environment. This presentation focuses on the analysis of the theories and concepts of migration of the Yoruba of the Coastal Nigeria which has not been given adequate attention. The study relies on diligent collection and interpretation of oral, ethnographic, archival and secondary source materials. The study observed that the pull and push factor in the settlement of the various coastal Yoruba found expression in economic, political, social, religious and geographical factors. The pattern of migration was from less favourable environment to more favourable one leading to fission and fusion of groups. The religious factor, especially that of the Ifa oracle played a dominant role in the settlement of many groups while the Ife connection remains a binding force.
A Numerical Simulation Model for in situ Combustion Processes with Heat Source/Sink and Variable Permeability
R.O. Olayiwola
Journal of Modern Mathematics and Statistics , 2012,
Abstract: This study presents a mathematical model of a constant pressure in situ combustion process with heat source and variable permeability using high activation energy asymptotics. Numerical solutions are constructed for the governing equations using thin flame technique together with shooting method technique. The results show that temperature increases as the flame speed decreases and Frank-Kamenetskii number increases.
Current Position of Sanitation in Nigerian Food Industries
R.O. Adeleke
Pakistan Journal of Nutrition , 2010,
Abstract: Evaluation of conformity of major commodity food industries to sanitation standards was carried out. Major fourteen food industries were investigated include dairy industry, bakery, beverage factory, fish processing industry, brewery, cereal processing and fruit canning industry. The survey shows that most Nigerian food industries were designed, constructed and operated without sufficient consideration for many important sanitary factors and without adequate facilities of the right kind or the type of conditions which would promote good personal hygiene and impeccable plant sanitation. Few of the industries performed satisfactorily in some of the area investigated while four companies attained the minimum standard specified in this survey on all overall basis. Much more attention needs to be paid to rodent and pest control, water treatment, waste disposal and utilization.
Comparative Survival and Growth Rate of Clarias gariepinus and Heteroclarias Hathclings Fed Live and Frozen Daphnia
R.O. Ojutiku
Pakistan Journal of Nutrition , 2008,
Abstract: Feeding trial was conducted to assess survival and growth rate of Clarias gariepinus and Heteroclarias (hybrid of Clarias gariepinus and Heterobranchus longifilis) larvae (3-day old) fed on live and frozen Daphnids. Live and Frozen daphnia were used as starter diet at 50 Daphnids per larvae per feeding time for each of the species for fourteen days to assess their performance. The response to the feed and the species were compared. Heteroclarias and Clarias gariepinus fed live Daphnids performed better in terms of growth rate than those fed Frozen daphnids, though, no significant difference (p<0.05) statistically. Clarias gariepinus and Heteroclarias fed Frozen had greater survival than those fed live Daphnids. Heteroclarias fed live and Frozen Daphnids performed better in growth and survival than Clarias gariepinus. Therefore, Live Daphnids is recommended for larvae though Frozen Daphnids can be used as supplement and Heteroclarias is recommended for aqua culturists for better growth and survival.
Growth of Chromolaeana odorata (Siam weed) in two soil samples studied under greenhouse condition
International Journal of Medicinal and Aromatic Plants , 2012,
Abstract: Chromolaena odorata (Siam weed), an invasive plant is known to be attracted to different types of soil as a result of the abundance of certain soil nutrients. However, there is very little information as to the evaluation of soil conditions that causes invasion of those specific soils by the plants. In this experiment, the components of two soil samples used in the greenhouse for the propagation of Siam weed was assessed, the physical condition of the greenhouse evaluated followed by the determination of the ability of the weed to grow under such conditions. Textural analysis of the two soil samples indicated clay and sandy loam soil. Meanwhile measured growth parameters in clay soil were significantly different from that of the sandy loam soil at 0.05 degree of freedom. Optimal growth of Siam weed was observed with the prevalent conditions and the physico-chemical parameters of the soil were improved upon throughout the duration of growth of the plant. The best stage for cross transplanting of the weed was found to fall within the range of 4 weeks after sprouting in the nursery as was noted by the highest percentage of survival of the plants within that interval of time. This study provides better propagation conditions of Siam weed especially in an environment deficient of the plant. It also provides an insight into the control of Chromolaena odorata.
The effects of Indole Butyric Acid (IBA) on rooting of Chromolaena odorata
International Journal of Medicinal and Aromatic Plants , 2011,
Abstract: This study encompasses the investigative effect of rooting media in addition to Indole Butyric Acid hormone on root development of stem cuttings of Chromolaena odorata. Stem cuttings of C. odorata treated with equal quantities of IBA hormone (0.7%) were grown in 1kgs of vermuculate, perlite, planting soil, sand, and equal mixture of all media. The set up were treated equally with water and organic manure. Control set up was made with a mixture of different rooting media without IBA. Data on shoot development were noted for 6weeks and root length was measured on the day of harvest. The parameters measured were analysed statistically using ANOVA, and it was found out that root and shoot lengths were significant at p>0.05 in the entire rooting media and the highest percentage development (49 and 51%) respectively for root and stem respectively, was observed in the rooting media that has equal measure of each constituent (i.e. the mixed constituents). Germination rate among the media were 100, 70, 60, 50 and 40% for mixed, sand, planting soil and vermiculate, perlite and control respectively. Different sections of mature stem tested with IBA hormone were not significant in their root and stem development, although basal cutting stems tend to mature faster than epical. This therefore means that propagating C. odorata by stem cutting can be optimally achieved through mixture of 0.7% of IBA in a collection of different rooting media.
Income Portfolios in Rural Nigeria: Composition and Determinants
R.O. Babatunde
Trends in Agricultural Economics , 2008,
Abstract: This study uses household`s survey data to analyze income portfolios and determinants in rural Nigeria. The results indicate that, while farming accounts for half of total household`s income, the other half is from different off-farm sources. Considering income composition across poverty groups, the results show that farm and remittance income are the main income sources for the poor households and therefore any policies that can address these income sources will have the greatest impact on poverty reduction. On the other hand, off-farm employment especially self-employed activities are the main income sources of the relatively better-off households. Econometric analysis shows that household assets, size, farm size, social infrastructure and market access are important determinants of total income. Policies that would simultaneously promote the development of the agricultural and off-farm sectors are suggested to reduce poverty in rural Nigeria.
Crystallooptics of the circularly polarized waves
R.O. Vlokh
Ukrainian Journal of Physical Optics , 2001,
Abstract: Article is devoted to the analysis and experimental study of the interaction between the cir-cularly polarized waves as the eigen waves of gyrotropic crystals. The new effects such as two-beam refraction of the circular waves, acoustogyration diffraction of light, interferencion of the circularly polarized waves are phenomenologycaly predicted and experimentally studied. The phenomenological analysis and experimental study of the different types of optical activity that appear as the result of interaction of circular waves at the influence of electrical and magnetic field as well as mechanical strain is presented. The relations for the electro-, piezooptical and electro-, piezogyration effects in paraphase of the ferroelectrics-ferroelastics are obtained. It was shown that crystallooptics of the circularly polarized waves could be considered as the separate branch of traditional crystalloooptics.
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