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Search Results: 1 - 10 of 453 matches for " Kofi Mensah Nyarko "
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Risk Factors for Buruli Ulcer in Ghana—A Case Control Study in the Suhum-Kraboa-Coaltar and Akuapem South Districts of the Eastern Region
Ernest Kenu ,Kofi Mensah Nyarko,Linda Seefeld,Vincent Ganu,Michael K?ser,Margaret Lartey,Benedict Nii Laryea Calys-Tagoe,Kwodwo Koram,Richard Adanu,Oliver Razum,Edwin Afari,Fred N. Binka
PLOS Neglected Tropical Diseases , 2014, DOI: 10.1371/journal.pntd.0003279
Abstract: Background Buruli ulcer (BU) is a skin disease caused by Mycobacterium ulcerans. Its exact mode of transmission is not known. Previous studies have identified demographic, socio-economic, health and hygiene as well as environment related risk factors. We investigated whether the same factors pertain in Suhum-Kraboa-Coaltar (SKC) and Akuapem South (AS) Districts in Ghana which previously were not endemic for BU. Methods We conducted a case control study. A case of BU was defined as any person aged 2 years or more who resided in study area (SKC or AS District) diagnosed according to the WHO clinical case definition for BU and matched with age- (+/?5 years), gender-, and community controls. A structured questionnaire on host, demographic, environmental, and behavioural factors was administered to participants. Results A total of 113 cases and 113 community controls were interviewed. Multivariate conditional logistic regression analysis identified presence of wetland in the neighborhood (OR = 3.9, 95% CI = 1.9–8.2), insect bites in water/mud (OR = 5.7, 95% CI = 2.5–13.1), use of adhesive when injured (OR = 2.7, 95% CI = 1.1–6.8), and washing in the Densu river (OR = 2.3, 95% CI = 1.1–4.96) as risk factors associated with BU. Rubbing an injured area with alcohol (OR = 0.21, 95% CI = 0.008–0.57) and wearing long sleeves for farming (OR = 0.29, 95% CI = 0.14–0.62) showed protection against BU. Conclusion This study identified the presence of wetland, insect bites in water, use of adhesive when injured, and washing in the river as risk factors for BU; and covering limbs during farming as well as use of alcohol after insect bites as protective factors against BU in Ghana. Until paths of transmission are unraveled, control strategies in BU endemic areas should focus on these known risk factors.
Source Assessment and Analysis of Polycyclic Aromatic Hydrocarbon (PAH’s) in the Oblogo Waste Disposal Sites and Some Water Bodies in and around the Accra Metropolis of Ghana  [PDF]
David Kofi ESSUMANG, Christian. Kweku ADOKOH, Joseph AFRIYIE, Esther MENSAH
Journal of Water Resource and Protection (JWARP) , 2009, DOI: 10.4236/jwarp.2009.16055
Abstract: The study looked at the levels of polycyclic aromatic hydrocarbons (PAHs) in leachates from a solid waste disposal site and an effluent from an oil refinery in some water bodies around Accra. Sixteen (PAHs) were extracted simultaneously by solid phase and analysis by gas chromatograph. The results of this study gener-ally demonstrated that there were elevated levels of PAHs in the water sample of the Densu River, Chemu, Korle and Kpeshi Lagoons. The average concentration of PAHs in the water ranged from 0.000 of many of the PAHs to 0.552µg/L, for Acenapththene to 11.399µg/L for Benzo (ghi) perylene of the Chemu Lagoon, 0.00µg/L for Benzo (a) Pyrene to 8.800µg/L for Benzo (ghi) perylene (Korle Lagoon) and 0.052µg/L for Pyrene to 4.703ug/L for Acenaphthylene of the Kpeshi Lagoon and 0.00µg/L for pyrene to Acenaphthylene 2.926µg/L of the Weija Dam. Concentrations ranging from below detection level to 14.587µg/L were also recorded at the Oblogo solid waste dump and it’s environ. The Weija dam supply over two million gallons of portable water daily to the people of Accra and the levels of the PAH determined is worrying, as a result, the Oblogoh disposal site ought to be re-located to avert any possible epidemic.
Soil Erosion around Foundations of Houses in Four Communities in Ghana  [PDF]
Kofi Agyarko, Joseph Adu, Daniel Gyasi, Samuel Kumi, Lydia Mensah
Open Journal of Soil Science (OJSS) , 2012, DOI: 10.4236/ojss.2012.21005
Abstract: Soil erosion studies around houses in four communities in Ghana were carried out from August to November, 2010. Thirty houses were selected from each of the four communities for the study. Measurements of slope and the depth of exposed foundation of houses were done with the help of a string and a tape measure. Data were also obtained through questionnaire and interview of house owners. The Pearson’s correlation coefficient was used to measure some relationships among data. In the selection of site for building a house, higher percentage of the house owners considered no factor. The major cleaning activity around the surrounding of houses was noted to be sweeping with a broom. All the houses in the communities had their foundations exposed, 57% - 93% of the houses had exposed foundations up to a level within 51 - 100 cm which was classified as “Severely Exposed”. The extent of building foundation exposed by soil erosion was found to be positively correlated with the age of building and the slope of the land. Most of the respondents controlled soil erosion by blocking water ways with materials such as, sand heaps, stones and sacks filled with soil. Only 10% of the respondents from one of the communities planted grasses around their houses to control soil erosion. Communities need to be educated to plant grasses around their houses to beautify the surroundings and to control soil erosion.
Comparison of Rainy Season Onset, Cessation and Duration for Ghana from RegCM4 and GMet Datasets  [PDF]
Caleb Mensah, Leonard K. Amekudzi, Nana Ama B. Klutse, Jeffrey N. A. Aryee, Kofi Asare
Atmospheric and Climate Sciences (ACS) , 2016, DOI: 10.4236/acs.2016.62025
Abstract: The socio-economic sector of West African countries is rain-fed agriculture driven. Information regarding the onset, cessation and duration of the rainy season is thus, very essential. In this paper, a comparison of the onset, cessation and duration of the rainy season has been carried out using simulated rainfall data from the fourth generation Regional Climate Model (RegCM4) and rain gauge measurements from Ghana Meteorological Agency (GMet), covering a period of 1998 to 2012. Similar onset and cessation dates were seen in both the simulated and guage rainfall measurements for the various agro-ecological zones, resulting in similar duration of the rainy season. The average duration of the rainy season were less than 200 days for the savannah and coastal zones whereas the duration of the rainy season were beyond 200 days for the forest and transition zones. The bias of these comparisons was less than 30 days and the root mean square error (RMSE) values were less than 15 days for all stations, except Saltpond. The Pearson’s correlation (r) typically ranged between 0.4 and 0.8. However, negative correlations were observed for Tamale in the savannah zone, and the entire coastal zone. These findings are indications that RegCM4 has the potential to clearly simulate the movement of the rain belt, and thus, could fairly determine the onset, cessation and duration of the rainy season. The findings have significant contributions to effective water resource management and food security in Ghana, as the thriving of these sectors depend on the dynamics of the rainfall seasons.
High-Frequency Electric Field Induced Nonlinear Electron Transport in Chiral Carbon Nanotubes  [PDF]
Sulemana S. Abukari, Samuel Y. Mensah, Musah Rabiu, Kofi W. Adu, Natalia G. Mensah, Anthony Twum, Alfred Owusu, Kwadwo A. Dompreh, Patrick Mensah-Amoah, Matthew Amekpewu
World Journal of Condensed Matter Physics (WJCMP) , 2015, DOI: 10.4236/wjcmp.2015.54030
Abstract: We investigate theoretically the high frequency complex conductivity in carbon nanotubes that are stimulated axially by a strong inhomogeneous electric field of the form E(t)=E0+E1cos(ωt). Using the kinetic approach based on Boltzmann’s transport equation with constant relaxation time approximation and the energy spectrum of the electron in the tight-binding approximation, together with Bhatnagar-Gross-Krook collision integral, we predict high-frequency nonlinear effects along the axial and the circumferential directions of the carbon nanotubes that may be useful for the generation of high frequency radiation in the carbon nanotubes.
Knowledge of Malaria Prevention and Control in a Sub-Urban Community in Accra, Ghana
Isaac Appiah-Darkwah,Samuel Kofi Badu-Nyarko
International Journal of Tropical Medicine , 2012, DOI: 10.3923/ijtmed.2011.61.69
Abstract: Knowledge of community members in malaria is a major factor that can influence malaria prevention and control. The study sought to identify possible relationships between personal characteristics of community members and their knowledge of malaria prevention and control. It was found out that educational level of the people did not relate to their knowledge of malaria prevention (χ2 = 2.112, df. 3, p = 0.55). Females had higher knowledge on malaria than males. Both the less educated and highly educated are aware that malaria can be prevented. Formal educational levels might not directly affect ones knowledge about the causes of malaria. In conclusion, knowledge in malaria prevention and control might not result from formal education only but other sources such as non-formal and informal education. Respondents knowledge level on matters relating to malaria was high yet their actions towards prevention and control were discouraging.
Domain Suppression in the Negative Differential Conductivity Region of Carbon Nanotubes by Applied AC Electric Field  [PDF]
Sulemana S. Abukari, Samuel Y. Mensah, Kofi W. Adu, Natalia G. Mensah, Kwadwo A. Dompreh, Anthony Twum, Chales L. Y. Amuah, Matthew Amekpewu, Musah Rabiu
World Journal of Condensed Matter Physics (WJCMP) , 2012, DOI: 10.4236/wjcmp.2012.24045
Abstract: We study theoretically the electron transport properties in achiral carbon nanotubes under the influence of an external electric field E(t) using Boltzmann’s transport equation to derive the current-density. A negative differential conductivity (NDC) is predicted in quasi-static approximation i.e., ωτ << 1, similar to that observed in superlattice. However, a strong enhancement in the current density intensity is observed in NDC of the achiral carbon nanotubes. This is observed at where the constant electric field E0 is equal to the amplitude of the AC electric field E1. The peak of the NDC intensity occurs at very weaker fields than that of superlattice under the same conditions. The peak intensity decreases and shifts to right with the increase in the amplitude of the ac field. This mechanism suppresses the domain formation and therefore could be used in terahertz frequency generation.
External Electric Field Effect on Electrons Transport in Carbon Nanotubes  [PDF]
Sulemana S. Abukari, Samuel Y. Mensah, Musah Rabiu, Kofi W. Adu, Natalia G. Mensah, Kwadwo A. Dompreh, Anthony Twum, Matthew Amekpewu
World Journal of Condensed Matter Physics (WJCMP) , 2013, DOI: 10.4236/wjcmp.2013.34027

We consider a simple model of carbon nanotubes (CNTs) subject to external electric field E(t). Using a tight-binding approximation for the description of energy bands of CNTs, together with the standard Boltzmann transport equation and constant relaxation time, we predict the effect of self-induced transparency and absolute negative conductivity. The predicted effects may be useful in diagnostics of carbon nanotubes as well as in the amplification and efficiency conversion of electromagnetic signals.

Completely bounded Fourier multipliers over compact groups
E. Julien Atto,Yaogan Mensah,V. S. Kofi Assiamoua
International Journal of Mathematical Analysis , 2012,
Application of Earth Observation Technology to Site Selection and Development of Ecotourism Management Plans in Rural Ghana
Selase Kofi Adanu,Foster Kwami Mensah,Sesime Kofi Adanu,Dziwornu Kwami Adanu
ISRN Forestry , 2013, DOI: 10.1155/2013/924506
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