12 results on '"Assamagan, Kétévi A."'
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2. Modelling the impact of vaccination on COVID-19 in African countries.
- Author
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Mathebula, Dephney, Amankwah, Abigail, Amouzouvi, Kossi, Assamagan, Kétévi Adiklè, Azote, Somiealo, Fajemisin, Jesutofunmi Ayo, Fankam Fankame, Jean Baptiste, Guga, Aluwani, Kamwela, Moses, Kanduza, Mulape Mutule, Mabote, Toivo Samuel, Macucule, Francisco Fenias, Muronga, Azwinndini, Njeri, Ann, Oluwole, Michael Olusegun, and Paulo, Cláudio Moisés
- Subjects
COVID-19 pandemic ,SARS-CoV-2 ,BREAKTHROUGH infections ,SOCIAL distancing ,VACCINE development - Abstract
The rapid development of vaccines to combat the spread of COVID-19, caused by the SARS-CoV-2 virus, is a great scientific achievement. Before the development of the COVID-19 vaccines, most studies capitalized on the available data that did not include pharmaceutical measures. Such studies focused on the impact of non-pharmaceutical measures such as social distancing, sanitation, use of face masks, and lockdowns to study the spread of COVID-19. In this study, we used the SIDARTHE-V model, an extension of the SIDARTHE model, which includes vaccination rollouts. We studied the impact of vaccination on the severity of the virus, specifically focusing on death rates, in African countries. The SIRDATHE-V model parameters were extracted by simultaneously fitting the COVID-19 cumulative data of deaths, recoveries, active cases, and full vaccinations reported by the governments of Ghana, Kenya, Mozambique, Nigeria, South Africa, Togo, and Zambia. Using South Africa as a case study, our analysis showed that the cumulative death rates declined drastically with the increased extent of vaccination drives. Whilst the infection rates sometimes increased with the arrival of new coronavirus variants, the death rates did not increase as they did before vaccination. Author summary: The onset of the COVID-19 pandemic prompted swift global responses. These included non-pharmaceutical control measures at the beginning of the pandemic such as social distancing, masks, and the later development of vaccines. In our first paper, we studied the evolution of the pandemic in the African continent by fitting the observed data with the SIRDATHE model in the first year (March 2020—March 2021) of the pandemic, before vaccination. We examined the impact of non-pharmaceutical control measures on COVID-19 transmission in the first year of the pandemic. As vaccination campaigns commenced, we extended our model to SIDARTHE-V model, which included the vaccination component. The SIRDATHE-V model assumes total immunity in the vaccinated population. However, our observations revealed breakthrough infections even amongst the vaccinated population. Therefore, in our application of the SIRDATHE-V model, we considered the fact that even the vaccinated could become infected. In this study, we investigated the impact of COVID-19 vaccination in Africa. We analysed COVID-19 data from seven African countries: Ghana, Kenya, Mozambique, Nigeria, South Africa, Togo, and Zambia over approximately two years, from March 2020 to March 2022. Considering variations in vaccination programs in each country, for example, the use of different vaccines and different starting dates, this study focused on the impact of vaccination on the death rates. Our findings showed a decline in cumulative death rates due to COVID-19 when vaccination drives were coupled with non-pharmaceutical control measures. We therefore conclude that in combating the spread of acute viral infections with dynamics similar to COVID-19, a comprehensive strategy involving both pharmaceutical (vaccination) and non-pharmaceutical (social measures) interventions is crucial. [ABSTRACT FROM AUTHOR]
- Published
- 2024
- Full Text
- View/download PDF
3. Activity Report on the Seventh African School of Fundamental Physics and Applications (ASP2022)
- Author
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Assamagan, Kétévi A., Acharya, Bobby, Cecire, Kenneth, Darve, Christine, Ferroni, Fernando, Gray, Julia Ann, and Muronga, Azwinndini
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Physics - Physics and Society ,Physics Education (physics.ed-ph) ,Physics - Physics Education ,FOS: Physical sciences ,Physics and Society (physics.soc-ph) - Abstract
The African School of Fundamental Physics and Applications, also known as the African School of Physics (ASP), was initiated in 2010, as a three-week biennial event, to offer additional training in fundamental and applied physics to African students with a minimum of three-year university education. Since its inception, ASP has grown to be much more than a school. ASP has become a series of activities and events with directed ethos towards physics as an engine for development in Africa. We report on the seven African School of Physics, ASP2022, organized at Nelson Mandela University, on November~28 to December~8, 2022. ASP2022 included programs for university students, high school teachers and high school pupils., 18 pages
- Published
- 2023
4. Modelling the impact of vaccination on the COVID-19 pandemic in African countries
- Author
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Mathebula, Dephney, Amankwah, Abigail, Amouzouvi, Kossi, Assamagan, Kétévi A., Azote, Somiéalo, Fajemisin, Jesutofunmi Ayo, Fankam, Jean Baptiste Fankam, Guga, Aluwani, Kamwela, Moses, Mabote, Toivo S., Kanduza, Mulape M, Macucule, Francisco Fenias, Muronga, Azwinndini, Njeri, Ann, Oluwole, Michael, and Paulo, Cláudio Moisés
- Subjects
FOS: Biological sciences ,Populations and Evolution (q-bio.PE) ,Quantitative Biology - Populations and Evolution - Abstract
The rapid development of vaccines to combat the spread of COVID-19 disease caused by the SARS-CoV-2 virus is a great scientific achievement. Before the development of the COVID-19 vaccines, most studies capitalized on the available data that did not include pharmaceutical measures. Such studies focused on the impact of non-pharmaceutical measures (e.g social distancing, sanitation, wearing of face masks, and lockdown) to study the spread of COVID-19. In this study, we used the SIDARTHE-V model which is an extension of the SIDARTHE model wherein we include vaccination roll outs. We studied the impact of vaccination on the severity (deadly nature) of the virus in African countries. Model parameters were extracted by fitting simultaneously the COVID-19 cumulative data of deaths, recoveries, active cases, and full vaccinations reported by the governments of Ghana, Kenya, Mozambique, Nigeria, South Africa, Togo, and Zambia. With countries having some degree of variation in their vaccination programs, we considered the impact of vaccination campaigns on the death rates in these countries. The study showed that the cumulative death rates declined drastically with the increased extent of vaccination in each country; while infection rates were sometimes increasing with the arrival of new waves, the death rates did not increase as we saw before vaccination., 40 pages, 10 figures
- Published
- 2022
5. Policing and Gatekeeping in STEM
- Author
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Hodari, Apriel K, Krammes, Shayna B, Prescod-Weinstein, Chanda, Nord, Brian D, Esquivel, Jessica N, and Assamagan, Kétévi A
- Subjects
Physics - Physics and Society ,Physics Education (physics.ed-ph) ,Physics - Physics Education ,FOS: Physical sciences ,Physics and Society (physics.soc-ph) - Abstract
The purpose of this white paper is to lay out the impacts of policing and gatekeeping in STEM, illustrated with lived experiences of scientists of color who are achieving despite the daunting challenges they face., Submitted to the Proceedings of the US Community Study on the Future of Particle Physics (Snowmass 2021); 15 pages Added references
- Published
- 2022
6. How to Read the Snowmass White Papers on Power Dynamics in Physics, Informal Socialization in Physics Training, and Policing and Gatekeeping in STEM
- Author
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Hodari, Apriel K, Krammes, Shayna B, Prescod-Weinstein, Chanda, Nord, Brian D, Esquivel, Jessica N, and Assamagan, Kétévi A
- Subjects
Physics - Physics and Society ,Physics Education (physics.ed-ph) ,Physics - Physics Education ,FOS: Physical sciences ,Physics and Society (physics.soc-ph) - Abstract
The Community Engagement Frontier presents this set of three white papers, as part of Snowmass 2021. These papers address critical issues -- Power Dynamics in Physics, Informal Socialization in Physics Training, and Policing and Gatekeeping in STEM -- that make significant impacts on the experiences of the people who work in and learn particle physics. In this introductory document, we present crosscutting concepts that appear in each paper, and some advice on how to manage readers' responses to the contents. We expect that you will learn something new here. We hope that whatever you encounter, you will be energized to increase justice in this discipline we all love., Submitted to the Proceedings of the US Community Study on the Future of Particle Physics (Snowmass 2021); 6 pages Added references, and corrected typos
- Published
- 2022
7. Lifestyle and personal wellness in particle physics research activities
- Author
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Lewis, Tiffany R., Simon, Sara M., Bonifazi, Carla, Thais, Savannah, Castro, Johan Sebastian Bonilla, Assamagan, Kétévi A., and Chen, Thomas Y.
- Subjects
Physics - Physics and Society ,FOS: Physical sciences ,Physics and Society (physics.soc-ph) - Abstract
Finding a balance between professional responsibilities and personal priorities is a great challenge of contemporary life and particularly within the HEPAC community. Failure to achieve a proper balance often leads to different degrees of mental and physical issues and affects work performance. In this paper, we discuss some of the main causes that lead to the imbalance between work and personal life in our academic field. We present some recommendations in order to establish mechanisms to create a healthier and more equitable work environment, for the different members of our community at the different levels of their careers.
- Published
- 2022
8. Higgs portal vector dark matter interpretation: review of Effective Field Theory approach and ultraviolet complete models
- Author
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Zaazoua, Mohamed, Truong, Loan, Assamagan, Kétévi A., and Fassi, Farida
- Subjects
High Energy Physics - Phenomenology ,High Energy Physics - Phenomenology (hep-ph) ,High Energy Physics::Phenomenology ,FOS: Physical sciences ,Astrophysics::Cosmology and Extragalactic Astrophysics - Abstract
A review of the Higgs portal-vector dark matter interpretation of the spin-independent dark-matter nucleon elastic scattering cross section is presented, where the invisible Higgs decay width measured at the LHC is used. Effective Field Theory and ultraviolet complete models are discussed. LHC interpretations show only the scalar and Majorana dark-matter scenarios; we propose to include interpretation for vector dark matter in the EFT and UV completions theoretical framework. In addition, our studies suggest an extension of the LHC dark matter interpretations to the sub-GeV regime., contribution to Snowmass 2022
- Published
- 2021
9. The ATLAS discovery potential for a heavy charged Higgs boson in gg → tbH± with H± → tb
- Author
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Assamagan, Kétévi A. and Gollub, Nils
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- 2005
- Full Text
- View/download PDF
10. ATLAS discovery potential for a heavy charged Higgs boson
- Author
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Assamagan, Kétévi Adiklè, Coadou, Yann, and Deandrea, Aldo
- Published
- 2002
- Full Text
- View/download PDF
11. The African School of Fundamental Physics and Applications (ASP)
- Author
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Assamagan, Kétévi Adiklè and Laassiri, Mounia
- Subjects
ComputingMilieux_GENERAL ,ComputingMilieux_COMPUTERSANDEDUCATION ,Physics - Physics Education - Abstract
The African School of Fundamental Physics and Applications is a biennial school in Africa. It is based on the observation that fundamental physics provides excellent motivation for students of science. The aim of the school is to build capacity to harvest, interpret, and exploit the results of current and future physics experiments and to increase proficiency in related applications. The participating students are selected from all over Africa. The school also offers a workshop to train high school teachers, an outreach to motivate high school pupils and a physics conference to support a broader participation of African research faculties. Support for the school comes from institutes in Africa, Europe, USA and Asia. In this paper, we will present the school and discuss strategies to make the school sustainable., Comment: 8 pages, 7 figures, Talk presented at the 2019 Meeting of the Division of Particles and Fields of the American Physical Society (DPF2019), July 29 - August 2, 2019, Northeastern University, Boston, C1907293
- Published
- 2019
12. The ATLAS discovery potential for a heavy charged Higgs boson ingg?tbH± withH± ?tb.
- Author
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Assamagan, Kétévi and Gollub, Nils
- Subjects
HIGGS bosons ,DETECTORS ,RADIOACTIVE decay ,PARTICLES (Nuclear physics) ,LARGE Hadron Collider ,PARTICLE accelerators - Abstract
The feasibility of detecting a heavy charged Higgs boson,m
H± >mt +mb , decaying in theH± ?tbchannel is studied with the fast simulation of the ATLAS detector. We study thegg?H± tbproduction process at the LHC which together with the aforementioned decay channel leads to fourb-quarks in the final state. The whole production and decay chain reads. Combinatorial background is a major difficulty in this multi-jet environment but can be overcome by employing multivariate techniques in the event reconstruction. Requiring fourb-tagged jets in the event helps to effectively suppress the Standard Model backgrounds but leads to no significant improvement in the discovery potential compared to analyses requiring only threeb-tagged jets. This study indicates that charged Higgs bosons can be discovered at the LHC up to high masses (mH± >400 GeV) in the case of large tanß.Keywords:charged Higgs; MSSMPACS:14.80.Cp - 12.60.Jv - 11.10.Kk [ABSTRACT FROM AUTHOR]- Published
- 2005
- Full Text
- View/download PDF
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