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Search Results: 1 - 10 of 111729 matches for " Rhoda O. Mbuk "
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The Role of Paraquat (1,1-dimethyl-4,4-bipyridinium chloride) and Glyphosate (n-phosphonomethyl glycine) in Translocation of Metal Ions to Subsurface Soils.
Rhoda O. Mbuk,Rufus Sha’Ato2,Nnadozie N. Nkpa
Pakistan Journal of Analytical and Environmental Chemistry , 2009,
Abstract: We investigated the role of paraquat (1,1’-Dimethyl-4,4’-bipyridinium dichloride) and glyphosate (N-(phosphonomethyl) glycine), on the translocation of some metals (K, Mg(II), Mn(II), Fe(II), Pb(II), Cu(II) and Cd(II)) in soil, using a topsoil (Aquic Ustifluvent: USDA Soil Taxonomy, 2000) sampled at the University of Agriculture Makurdi Crop Farm, in Central Nigeria (7o 47’N, 8o 32’E). Employing column leaching experiments with water only on native soil and soil spiked with the metals and different levels of glyphosate or paraquat treatment, leachates were collected and analyzed for their metal contents. Results showed that in the presence of paraquat the transport of Fe(II) and Mn(II) by leaching in the soil was suppressed while that of Cu(II), K and Pb(II) was enhanced. Glyphosate, similarly suppressed Mn(II) and to some extent Fe(II) translocation in the soil; however, it enhanced the mobility of Cd(II), Cu(II), Mg(II), Pb(II) and K under similar treatment. While paraquat seemed to enhance the translocation of Mg(II) at low application rates of the herbicide, glyphosate promoted its transport only at high application rates; there was no evidence that paraquat affected the movement of Cd(II) in the soil. Our results show that the long-term use of these pesticides in the field may result in the depletion of Cu(II), K and Mg(II) in agricultural soils, and that the use of glyphospate may present the additional risk of possible groundwater contamination with Cd(II) and Pb(II).
Determination of Contact Angle from Contact Area of Liquid Droplet Spreading on Solid Substrate
Leonardo Electronic Journal of Practices and Technologies , 2007,
Abstract: Both complete and incomplete wetting were considered for the spreading of liquid drops on solid substrate. The liquid droplets were silicone oil, glycerine and hexadecane and the solid substrates are glass, polystyrene and polymethyl methacrylate (PMMA). Wetting was characterized by measuring the contact angle formed between the liquid drop and solid surface. Small droplets of constant volume were used for the measurements in order to minimize gravitational effects. The contact radius was obtained as a function of time by an image analysis system and used for the calculation of the contact area. The contact area was then used to determine the contact angle. The contact angles calculated from contact area are in good agreement with the experimental values.
Technology-Driven and Viable Child-Health Care for Enhanced Management of Universal Basic Education in Nigeria
O. Oduwaiye Rhoda,Shehu Raheem Adaramaja,Onasanya Samuel Adenubi
Pakistan Journal of Social Sciences , 2012,
Abstract: The United Nations had set the Millennium Development Goal (MDGs) to assist developing countries like Nigeria to meet up with the standards attained in developed worlds. Among the goals of the MDGs is the achievement of the universal basic education. Nigeria, as a developing country is expected by 2015 to meet the provisions of MDGs on basic education. The study focuses on the Universal Basic Education (UBE) in Nigeria. It examines the objectives of the scheme, the components and the challenges; Universal Basic Education attracts mainly children between the ages of 5-14 years. In these years, children are vulnerable to diseases like malaria, polio and socio-economic related diseases like diarrhea, kwashiorkor, cholera etc. A handful is affected by HIV/AIDS while some children of HIV/AIDS parents are orphaned by this disease. Children with these diseases can not maximally benefit from basic education. The need for Nigeria government to technologically drive their effort for a viable child-health care justifies the study. It concludes by offering suggestions as to the improvement of child-health care such as better education of parents, use of television to facilitate instructions, aggressive media campaign and improved environment.
Rheological Characterization of Yam and Potato Paste (Dioscorea rotundata) and (Ipomea batata) for Adhesive Purpose  [PDF]
Rhoda H. Gumus, Iweikumo Wauton
Advances in Chemical Engineering and Science (ACES) , 2014, DOI: 10.4236/aces.2014.42022

An experimental study has been carried out to determine the flow behavoir (rheological characterization) of potential adhesive of starch derived from sweet potato (Ipoemoa batatas) and yam (Dioscorea rotundata) at varying temperatures ranging from 40°C to 85°C with borax blend of 0.83%. The results obtained showed decreasing viscosity with an increasing temperature; potatoes had higher viscosity and density (27 × 103 cP), (0.813 g/m3) than yam (23 × 103 cP), (0.415 g/m3). The rheological data were evaluated by the power law and Casson models to describe the rheological behavoir. The Casson model gave a relatively poor fit to the experimental data with R values ranging from 0.899 to 0.967 from yam while a better fit was obtained for potato with r values ranging from 0.957 to 0.976. The predicted k and n values fit into experimental data (K = 26.36 and 0.388) and (K = 34.75 and 0.649) for yam and potato respectively; n < 1 showing Non-Newtonian behavoir. The relation between the temperature and K was described by an Arrhenius equation. Activation energies of 2.69 KJ/mol and 5.87 KJ/mol for yam and potato blends were obtained, indicating more sensitivity of yam blend to temperature compared to potato blend. With the experimental values obtained, a mathematical expression to relate shear stress and shear rate were proposed as:

Production of Activated Carbon and Characterization from Snail Shell Waste (Helix pomatia)  [PDF]
Rhoda Habor Gumus, Ideyonbe Okpeku
Advances in Chemical Engineering and Science (ACES) , 2015, DOI: 10.4236/aces.2015.51006
Abstract: Snail shell waste (Helix pomatia) has been evaluated as raw material for the preparation of activated carbon using ZnCl2 and CaCl2 with the temperature ranging from 500°C to 800°C. The activated carbon prepared was characterized, showing effect of temperature on ash content, pore volume and porosity. The adsorption isotherm for methylene blue was carried out on the activated carbon in a batch study. The adsorbent exhibited excellent adsorption for methylene blue. The experimental data were used for both Langmuir and Freundlich models. The adsorption coefficients of Langmuir isotherm were found to be 0.996 and 0.957 for CaCl2 and ZnCl2 while 0.969 and 0.962 were obtained for the Freundlich isotherm respectively. The value of RL was found to be 0.75 and 0.38 for samples CC and ZZ respectively, which is an indication that activated carbon impregnated with CaCl2 and ZnCl2 is favourable for adsorption of methylene blue under the conditions used in this study.
World Press Freedom Day, 5 May 2008
Rhoda Kadalie
Global Media Journal : African Edition , 2011, DOI: 10.5789/2-1-42
Abstract: The Department of Journalism at Stellenbosch University held a conference in celebration of International Press Freedom Day on 5 May. Abbey Makoe of the Forum for Black Journalists, Rhoda Kadalie, human rights activist, Khathu Mamaila, editor, City Press, and Henry Jeffreys, editor, Die Burger, debated the pro's and con's of media freedom. The respondent was Prof Wayne Wanta, a visiting Fulbright professor from Missouri University.
Problems of Evil and the Power of God
Rhoda, Alan
Ars Disputandi : the Online Journal for Philosophy of Religion , 2010,
Environmental barriers experienced by stroke patients in Musanze district in Rwanda: a descriptive qualitative study
G Urimubenshi, A Rhoda
African Health Sciences , 2011,
Abstract: Background: Patients with stroke experience a number of environmental barriers, limiting their re-integration. Information regarding the barriers experienced by patients with stroke in a specific setting such as the Musanze district in Rwanda would assist with the development of rehabilitation programmes that would take into consideration the barriers experienced by the clients. Objective: To explore the barriers experienced by patients with stroke residing in Musanze District. Methods: In-depth face-to-face interviews were used to gather the data which were analysed using a thematic approach. Results: Three major themes of the environmental barriers experienced by the study participants that emerged were social, attitudinal and physical barriers. Sub-themes that arose within the social barriers theme included lack of social support and inaccessible physiotherapy services. In terms of attitudinal barriers, the participants reported negative attitudes of others towards them. The sub themes related to physical barriers as described by the participants were inaccessible pathways and toilets. Conclusion: The findings of this study highlight the need for interventions that include awareness and education of communities about disability and advocating for accessible services and physical structures for persons with disabilities.
Reducing neonatal deaths in South Africa – are we there yet, and what can be done?
S Velaphi, N Rhoda
South African Journal of Child Health , 2012,
Peripheral neuropathy and quality of life of adults living with HIV/AIDS in the Rulindo district of Rwanda
J Biraguma, A Rhoda
SAHARA J (Journal of Social Aspects of HIV/AIDS Research Alliance) , 2012,
Abstract: Although the life expectancy of people living with HIV/AIDS (PLWH) has increased in the past years, they could experience secondary illness such as peripheral neuropathy (PN). Therefore, they need to adapt to chronic disablement which could affect their quality of life (QoL). The research that informed this article aimed at determining the prevalence of PN among adults living with HIV/AIDS and attending the outpatients’ clinic at Rutongo Hospital in the Rulindo district of Rwanda. Another aim was to determine these patients’ QoL. A cross-sectional descriptive quantitative research design was used. A time-constrained method was used to sample 185 adults living with HIV/AIDS and attending the outpatients’ clinic at Rutongo Hospital. The subjective PN screen and the World Health Organization Quality of Life Scale Brief Version were used to collect the data. Data were analysed using the Statistical Package for the Social Sciences. Student’s t-test and one-way analysis of variance were performed to determine if significant differences existed between QoL scores in participants with and without PN symptoms. The results indicated that 40.5% of respondents experienced PN. QoL in participants with PN showed significantly lower scores in the physical (p 0.013) and psychological (p 0.020) domains when compared with those who did not have PN. These results indicate a high prevalence of neuropathy among PLWH attending the outpatients’ clinic at Rutongo Hospital. In addition, patients with neuropathy had lower QoL scores in the physical and psychological domains than those without neuropathy symptoms. The management of PLWH should therefore include interventions to optimise QoL as well as screening for neuropathy symptoms so that sufferers can liaise with their medical providers to find medical and supportive therapies that could assist them.
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