Browsing by Author "Hassan, M.D."

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    Development of A Direct Conductive Coupled Multi-Input Phase-Shifted Full-Bridge DC-DC Converter
    (School of Electrical Engineering, Faculty of Engineering, Universiti Teknologi Malaysia, Johor Bahru., 2020) Otuoze, Abdulrahaman; Ibrahim, Oladimeji; Yahaya, Nor Zaihar; Saad, Nordin; Hassan, M.D.; Afolayan, Mubarak Akorede; Madugu, Ibrahim; Usman, Ayinde Mohammed
    Hybrid energy system is commonly employed in renewable energy systems to bridge the gap of non-availability of one power source with the others. In this work, a direct conductive electrical circuit connection topology for realizing multiple power source synchronization in the hybrid energy system is proposed. A three-input power sources integration scheme was realized via forward-conduction bidirectional blocking switch which serves input to the common power conversion stage of phase-shifted full-bridge DC-DC converter to boost the synchronized common bus voltage. An average current sharing controller is designed for the multiple parallel power sources to ensure equal load sharing when all the sources operates on the same and different voltage level. In this study, a 3-kW rating hybrid energy system was implemented in Simulink environment to investigate the multiple source integrator, the current sharing capability, and the common power conversion stage performance. The system ensured equal load sharing, allowed individual and simultaneous power transfer from the multiple sources to the load under the same and different operating supply voltage level.
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    Streptococcosis in Oreochromis sp.: is feed-based biofilm vaccine of Streptococcus agalactiae effective?
    (Springer Nature, 2019-04-03) Kahieshesfandiari , M.; Sabri, M.Y.; Ina-Salwany, M.Y.; Hassan, M.D.; Noraini, O.; Ajadi, A.A.; Isiaku, A.I.
    This study was carried out to determine the potential of a biofilm vaccine of Streptococcus agalactiae in protecting tilapia from streptococcocal infection. The tilapia were vaccinated orally using the biofilm vaccine with 1091010 CFU/g (FBV) incorporated in feed and killed whole-cell vaccine (FCV) of S. agalactiae also prepared in feed, and the unvaccinated control group (Cx) was fed with standard feed formulation. Throughout the study, serum, mucus and gut lavage fluid were collected to evaluate the antibody responses among the groups. The results showed that tilapia vaccinated with FBV exhibited significantly (p < 0.05) stronger immune response and high protection with the relative percentage survival (RPS) of more than 70% (85%) compared with the FCV group, which was only 56%. None of the tilapia in the Cx group survived (0%) post-challenge. Thus, the study revealed that the feed-based biofilm vaccine (FBV) significantly confers the immune protection against the high-dose challenge of S. agalactiae by secretion of the protective immunity in the mucosal and humoral in tilapia.