Giampaolo Manfrida, Shukuru J. M. Kawambwa,
A performance study is presented of a Rankine organic cycle powered by a low temperature solar collector. In this work a two-phase collector is considered where the heat transfer fluid is vaporized and its saturated vapor expands in a turbine according to a Rankine cycle. The collector system is divided into a boiling and a nonboiling (subcooled) part: The limit between the two depends upon the value of flow rate and radiation. A modified form of the Bliss equation is used to model the thermal performance ...
Tópico(s): Advanced Thermodynamics and Statistical Mechanics
1991 - ASM International | Journal of Solar Energy Engineering
Albertina Ngomah Moraes, Rosemary Ndonyo Likwa, Selestine Nzala,
... 24 years delivering at selected health facilities in Kawambwa and Mansa districts of Luapula.A retrospective analysis ...
Tópico(s): Reproductive Health and Contraception
2018 - BioMed Central | Maternal Health Neonatology and Perinatology
Shamte Kawambwa, Rukia J. Mwifunyi, Daudi Mnyanghwalo, Hamisi Ndyetabura, Ellen Kalinga, Nerey H. Mvungi,
Abstract This paper presents an improved load flow technique for a modern distribution system. The proposed load flow technique is derived from the concept of the conventional backward/forward sweep technique. The proposed technique uses linear equations based on Kirchhoff’s laws without involving matrix multiplication. The method can accommodate changes in network structure reconfiguration by involving the parent–children relationship between nodes to avoid complex renumbering of branches and nodes. ...
Tópico(s): Thermal Analysis in Power Transmission
2021 - Springer Science+Business Media | Journal of Electrical Systems and Information Technology
Shamte Kawambwa, Hamisi Ndyetabura, Prosper Mafole, Helard Kundaeli,
Tópico(s): Islanding Detection in Power Systems
2021 - Springer Science+Business Media | Evolutionary Intelligence
Rahim H. Kawambwa, Mtebe Majigo, Ahmed A. Mohamed, Mecky Matee,
Tanzania has witnessed a significant decrease in the prevalence of human immunodeficiency virus (HIV) and viral hepatitis in the general population attributed to several interventional measures. It is uncertain whether this decline has also occurred among people who inject drugs (PWID). This study aimed to determine the seroprevalence of HIV, Hepatitis B and C viruses infection among PWID recruited from their hotspot sites in Dar es Salaam, Tanzania.A cross-sectional study conducted between June and ...
Tópico(s): Hepatitis B Virus Studies
2020 - BioMed Central | BMC Public Health
Christopher M. Annear, David Coe, E. Cyril Greenall,
... in Kasama, the capital of Northern Province, and Kawambwa, a smaller borna (or administrative outpost) further west ... with an elderly lion found wandering through the Kawambwa boma. Upon preparing to shoot the lion Greenall ...
Tópico(s): African history and culture studies
2004 - Boston University | The International Journal of African Historical Studies
Malvern Kanyati, Hosea Lupambo Chishala, Chibale Chama Sweetbertha,
... among food handlers working in food establishments of Kawambwa central part, in Luapula province of Zambia.Quantitative ... contributing factors to poor food hygiene practices in Kawambwa central area.Based on the findings of the ... should be carried out in other parts of Kawambwa district and also extended to other parts of ...
Tópico(s): COVID-19 Pandemic Impacts
2022 - | International Journal of Humanities Social Sciences and Education
Trevor Chikuta, Kiru Sichoongwe, Austine Nakanga,
... and intensity of participation in collective marketing in Kawambwa, Luwingu and Senga Hill districts of Zambia. A ...
Tópico(s): Agricultural Innovations and Practices
2024 - | International Journal on Food Agriculture and Natural Resources
Shamte Kawambwa, Daudi Mnyanghwalo,
Abstract Metaheuristic algorithms have become popular in solving engineering optimization problems due to their advantages of simple implementation and the ability to find near-optimal solutions for complex and large-scale problems. However, most applications of metaheuristic algorithms consider centralized design, assuming that all possible solutions are available in one machine or controller. In some applications, such as power systems, especially DG coordination, centralized design may not be ...
Tópico(s): Microgrid Control and Optimization
2023 - Springer Science+Business Media | Journal of Electrical Systems and Information Technology
Daudi Mnyanghwalo, Shamte Kawambwa,
Abstract Modern power grids are developing toward smartness through the use of sensors in gathering data for situation awareness, visibility, and fault detection. In most developing countries, fault detection in the electrical secondary distribution network (SDN) is very challenging due to the lack of automated systems for network monitoring. Systems for monitoring faults require sensor placement on each node, which is not economically feasible. Hence, optimal placement algorithms are required to ...
Tópico(s): Power Systems Fault Detection
2024 - Springer Science+Business Media | Journal of Electrical Systems and Information Technology
Daudi Mnyanghwalo, Shamte Kawambwa,
Tópico(s): Power Systems Fault Detection
2024 - Cogent OA | Cogent Engineering
Shamte Kawambwa, Daudi Mnyanghwalo,
The increased penetration of distributed energy resources (DERs) technologies to residential users has fostered the need for DERs integration and control methods in the secondary distribution networks (SDN). In order to reap the potential advantages of DERs and achieve their inclusion in the electrical power system while avoiding their negative impacts, the DERs should be optimally placed and sized. Considering the nature of electrical networks and DER operations, the DERs placement is a nondeterministic ...
Tópico(s): Power Systems and Technologies
2023 - African Journals OnLine | Tanzania Journal of Science
Rukia J. Mwifunyi, Daudi Mnyanghwalo, Shamte Kawambwa,
The increased dependence on the electric power grid, coupled with the increasing number of new customers, motivates the need to improve the reliability and resilience of the electric distribution systems. Modern distribution systems are becoming more resilient against power outages due to the increasing integration of Distributed Energy Resources (DERs) and the availability of efficient mechanisms for load shedding. Several studies considered fault detection and Service Restoration (SR) as separate ...
Tópico(s): Smart Grid Energy Management
2023 - African Journals OnLine | Tanzania Journal of Science