7 results on '"Niyonzima, Jean Bosco"'
Search Results
2. Etude du potentiel hydroélectrique de la province Kayanza (Burundi): Application de la turbine Banki-Michell dans l'électrification des zones rurales
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Niyonzima, Jean Bosco, Hendrick, Patrick, Degrez, Gérard, Verbanck, Michel, SOARES‐FRAZÃO, Sandra, Katond Mbay, Jean-Paul, Huart, Michel, and Parmentier, Nicolas
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Banki-Michell turbine, flow measurement, turbine efficiency, cavitation phenomenon, hydroelectric potential, design ,Turbine Banki-Michell, mesure de débit, rendement de la turbine, phénomène de cavitation, potentiel hydroélectrique ,Sciences de l'ingénieur - Abstract
L’objectif de cette thèse est de mener une étude expérimentale d’une turbine Banki-Michell pouvant fonctionner dans les conditions hydrologiques des petites rivières du Burundi et d’en tirer des lois de dimensionnement de ce type de turbine et pour ses applications. Pour cela, une campagne de mesures de débit a été réalisée de janvier à décembre 2017 sur la rivière Mwogere au Burundi en utilisant la méthode des points réduits. Les résultats ont montré que le débit de la rivière Mwogere varie en fonction des saisons. Le débit est plus élevé pendant la saison des pluies et plus petit pendant la saison sèche. Le débit nominal obtenu est de 1,18 m3/s. Au laboratoire hydraulique de ULB-ATM, un banc d’essais de la turbine Banki-Michell a été installé et des essais de performance de cette turbine ont été réalisés. Les résultats obtenus montrent que la turbine Banki-Michell est peu sensible aux variations de débit au cours de son fonctionnement. Le rendement varie entre 40 et 60% pour une plage de débit variant entre 15 et 20% du débit nominal. Au-delà de 20% du débit nominal, le rendement de la turbine se situe entre 70 et 74%. Pour une turbine Banki-Michell fonctionnant avec une ouverture de la vanne statorique inférieure à 50%, la turbine est susceptible de présenter le phénomène de cavitation dans l’injecteur, entre le corps de l’injecteur et le siège de la vanne. Une étude avec simulations numériques a été réalisée avec l’outil de simulations ANSYS-WORKBENCH et les résultats montrent que ce phénomène apparait pour une ouverture de la vanne inférieure ou égale à 30% quand la turbine fonctionne à 5,0 m de hauteur chute. Pour un fonctionnement avec une hauteur de chute de 20,0 m, le phénomène de cavitation apparaît à 40% et moins d’ouverture de la vanne statorique. Dans le but d’étudier le potentiel hydroélectrique du site de Ryamukona et des applications de la turbine Banki-Michell au Burundi en général, un calcul de dimensionnement d’une turbine adéquate pour le site Ryamukona a été fait. Les résultats donnent une puissance potentielle de la turbine de 83,3 kW. On remarque que la charge électrique pour le site de Ryamukona est principalement constituée par l’éclairage des ménages qui occupe 56% de toute la charge électrique., The goal of this PhD thesis is about to conduct an experimental study of Banki-Michell turbine that can operate in the real hydrological conditions of small rivers in Burundi and then conclude on the design laws for such turbine and for such applications.In that way, a flow measurement was carried out from january to december 2017 on the Mwogere River in Burundi. The results showed that the discharge of the Mwogere River varied in seasonal way. The flow rate is higher during the rainy period and smaller during the dry season. The measured nominal discharge is about 1.18 m3/s.In the hydraulic laboratory of ULB-ATM, a Banki-Michell test-bench was installed and the turbine was tested for performance. The results showed that the turbine still lower sensitive to flow variations during its operation. The efficiency of the turbine varies between 40 and 60% for a flow range varying between 15 and 20% of the nominal flow rate. Above the 20% of the nominal flow rate, the efficiency of the turbine is between 70 and 74%. When Banki-Michell is operating, the cavitation phenomena could occur in the injector when the valve openings are lower than 50%. Numerical study was then done with the ANSYS-WORKBENCH and the results showed that the cavitation is occurring when the turbine operates at 5.0 m height for valve opening is lower or equal to 30%. In the case that the turbine is operating at 20.0 m height, the cavitation occurs at 40% and less of the valve opening. At the end, an assessment of the hydroelectric potential of the Ryamukona site was done in order to define the real geometry of a Banki-Michell turbine which could operate in the real hydrological conditions of the Mwogere River. Calculations gave a potential power required of the site of 83.3 kW. It was noted from the scheduled load of the Ryamukona site, that the major part of the electrical load is consumed by lighting the households, with 56% of the total scheduled load., Doctorat en Sciences de l'ingénieur et technologie, info:eu-repo/semantics/nonPublished
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- 2020
3. Improving Prevention of Mother-to-Child Transmission of HIV Care and Related Services in Eastern Rwanda
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Lim, Younsook, Kim, Jim Yong, Rich, Michael, Stulac, Sara, Niyonzima, Jean Bosco, Fawzi, Mary C. Smith, Gahire, Rose, Mukaminega, Martha, Getchell, Marya, Peterson, Curtis W., Farmer, Paul E., and Binagwaho, Agnes
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Child health services -- Service enhancement ,HIV infection in children -- Risk factors -- Prevention -- Distribution ,Company distribution practices ,Biological sciences - Abstract
Introduction A recent World Health Organization (WHO) report found a complex array of positive and negative impacts of global health initiatives (GHIs) on existing health systems [1]. The report's examination [...]
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- 2010
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4. Remoteness and maternal and child health service utilization in rural Liberia: A population–based survey
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Kenny, Avi, primary, Basu, Gaurab, additional, Ballard, Madeleine, additional, Griffiths, Thomas, additional, Kentoffio, Katherine, additional, Niyonzima, Jean Bosco, additional, Sechler, G. Andrew, additional, Selinsky, Stephen, additional, Panjabi, Rajesh R., additional, Siedner, Mark J., additional, and Kraemer, John D., additional
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- 2015
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5. Excellent Clinical Outcomes and High Retention in Care Among Adults in a Community-Based HIV Treatment Program in Rural Rwanda
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Rich, Michael L., primary, Miller, Ann C., additional, Niyigena, Peter, additional, Franke, Molly F., additional, Niyonzima, Jean Bosco, additional, Socci, Adrienne, additional, Drobac, Peter C., additional, Hakizamungu, Massudi, additional, Mayfield, Alishya, additional, Ruhayisha, Robert, additional, Epino, Henry, additional, Stulac, Sara, additional, Cancedda, Corrado, additional, Karamaga, Adolph, additional, Niyonzima, Saleh, additional, Yarbrough, Chase, additional, Fleming, Julia, additional, Amoroso, Cheryl, additional, Mukherjee, Joia, additional, Murray, Megan, additional, Farmer, Paul, additional, and Binagwaho, Agnes, additional
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- 2012
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6. Improving Prevention of Mother-to-Child Transmission of HIV Care and Related Services in Eastern Rwanda.
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Younsook Lim, Jim Yong Kim, Rich, Michael, Stulac, Sara, Niyonzima, Jean Bosco, Smith Fawzi, Mary C., Gahire, Rose, Mukaminega, Martha, Getchell, Marya, Peterson, Curtis W., Farmer, Paul E., and Binagwaho, Agnès
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HIV prevention ,AIDS prevention ,HEALTH services administration ,MATERNAL health services ,CHILD health services ,QUALITY of service ,COMMUNITY health workers - Abstract
The article focuses on the improvement of HIV care and related services to prevent mother-to-child transmission (PMTCT) of HIV/AIDS in eastern Rwanda. It suggests designing targeted disease-specific programs to have an impact on associated nontargeted services to maximize the health value given to families. It emphasizes that methods for quality improvement can be effective tools to engage local health workers and target limited resources investment to maximize services improvement.
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- 2010
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7. Excellent clinical outcomes and high retention in care among adults in a community-based HIV treatment program in rural Rwanda.
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Rich ML, Miller AC, Niyigena P, Franke MF, Niyonzima JB, Socci A, Drobac PC, Hakizamungu M, Mayfield A, Ruhayisha R, Epino H, Stulac S, Cancedda C, Karamaga A, Niyonzima S, Yarbrough C, Fleming J, Amoroso C, Mukherjee J, Murray M, Farmer P, and Binagwaho A
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- Adolescent, Adult, Aged, CD4 Lymphocyte Count, Cohort Studies, Female, HIV genetics, HIV Infections immunology, HIV Infections virology, Humans, Logistic Models, Male, Middle Aged, Patient Compliance, Patient Dropouts, RNA, Viral blood, Retrospective Studies, Rural Population, Rwanda, Treatment Outcome, Young Adult, Anti-HIV Agents therapeutic use, HIV isolation & purification, HIV Infections drug therapy
- Abstract
Background: Access to antiretroviral therapy (ART) has rapidly expanded; as of the end of 2010, an estimated 6.6 million people are receiving ART in low-income and middle-income countries. Few reports have focused on the experiences of rural health centers or the use of community health workers. We report clinical and programatic outcomes at 24 months for a cohort of patients enrolled in a community-based ART program in southeastern Rwanda under collaboration between Partners In Health and the Rwandan Ministry of Health., Methods and Findings: A retrospective medical record review was performed for a cohort of 1041 HIV+ adult patients initiating community-based ART between June 1, 2005, and April 30, 2006. Key programatic elements included free ART with direct observation by community health worker, tuberculosis screening and treatment, nutritional support, a transportation allowance, and social support. Among 1041 patients who initiated community-based ART, 961 (92.3%) were retained in care, 52 (5%) died and 28 (2.7%) were lost to follow-up. Median CD4 T-cell count increase was 336 cells per microliter [interquartile range: (IQR): 212-493] from median 190 cells per microliter (IQR: 116-270) at initiation., Conclusions: A program of intensive community-based treatment support for ART in rural Rwanda had excellent outcomes in 24-month retention in care. Having committed to improving access to HIV treatment in sub-Saharan Africa, the international community, including country HIV programs, should set high programmatic outcome benchmarks.
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- 2012
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