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RISS 인기검색어
- 검색키워드
- 저자 : Ramli Nur Fariza (검색결과 2 건)
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Ramli Nur Fariza,Kamari Nor Azwan Mohamed,Abd Halim Syahirah,Zulkifley Mohd Asyraf,Sahri Mohd Saiful Mohd,Musirin Ismail 대한전기학회 2022 Journal of Electrical Engineering & Technology Vol.17 No.1
This study presents the effi ciency of the wind-driven optimisation (WDO) approach in solving non-convex economic dispatch problems with point-valve eff ect. The best economic dispatch for a power system is one wherein the system can generate energy at a low cost. The calculation of the generating cost is subject to a number of constraints, such as the power demand for the entire system and the generation limit for each generator unit in the system. In addition, the system should also produce low power loss. The WDO optimisation technique is developed based on the concept of natural wind movement, which serves as a stabiliser to equalise the inequality of air pressure in the atmosphere. One major advantage of WDO over other techniques is its search accuracy. The proposed algorithm has been implemented in two systems, namely, the 10-generator and 40-generator systems. Both systems were tested in a Matlab environment. To highlight the capabilities of WDO, the results using this proposed technique are compared with the results obtained using fl ower pollination algorithm, moth fl ame optimisation, particle swarm optimisation and evolutionary programming techniques to determine the effi ciency of the proposed approach in solving economic dispatch. The simulation results show the capability of WDO in determining the optimal power generation value with minimum generation cost and low rate of power loss.
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Basari Norasmah,Ramli Sarah Najiah,Abdul-Mutalid Nur Adawiyah,Shaipulah Nur Fariza M.,Hashim Nur Aida 한국응용곤충학회 2021 Journal of Asia-Pacific Entomology Vol.24 No.2
Heterotrigona itama is a stingless bee species from Meliponini tribe. The bee collects nectar, pollen and resin to produce honey, bee bread, and propolis. The bee is also known to visit and collect nectar from various types of flowers but there are limited studies on why this species of bee prefers to visit certain types of flowers. This study was conducted to identify the nectar concentration in selected flowers favoured by H. itama and the relationship between the bee and the morphology of the flowers. Nectar was obtained from different species of flowers and the concentrations were measured using a digital refractometer. The tube length of each flower species and the tongue length of the bees were also measured. The results revealed that flowers preferred by H. itama have high nectar concentrations. The tube lengths of the preferred flowers were between 2.0 and 4.0 mm, which is compatible with the tongue length of the bee. This study revealed that both nectar concentration and flower morphology are important factors for the bees in choosing their food sources. The results from this study will benefit the beekeepers in the identification of flowers that should be planted in their farms to improve stingless bee beekeeping activities. Understanding the relationship between the bees and their flower preferences could also help us to understand the importance of conserving both the bee colonies and the various species of flowering plants to ensure the sustainability of flora and fauna in the ecosystem.
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