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Single Sensor Charging System with MPPT Capability for Standalone Streetlight Applications
Siti Rahimah Osman,Nasrudin Abd. Rahim,Jeyraj Selvaraj,Yusuf A. Al-Turki 전력전자학회 2015 JOURNAL OF POWER ELECTRONICS Vol.15 No.4
Maximum power point tracking (MPPT) and battery charging control are two important functions for a solar battery charger. The former improves utilization of the available solar energy, while the latter ensures a prolonged battery life. Nevertheless, complete implementation of both functions can be complex and costly, especially for low voltage application such as standalone street lamps. In this paper, the operation of a solar battery charger for standalone street light systems is investigated. Using only one voltage sensor, the solar charger is able to operate in both MPPT and constant voltage (CV) charging mode, hence providing high performance at a low cost. Using a lab prototype and a solar simulator, the operation of the charger system is demonstrated and its performance under varying irradiance is validated.
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Single Sensor Charging System with MPPT Capability for Standalone Streetlight Applications
Osman, Siti Rahimah,Rahim, Nasrudin Abd.,Selvaraj, Jeyraj,Al-Turki, Yusuf A. The Korean Institute of Power Electronics 2015 JOURNAL OF POWER ELECTRONICS Vol.15 No.4
Maximum power point tracking (MPPT) and battery charging control are two important functions for a solar battery charger. The former improves utilization of the available solar energy, while the latter ensures a prolonged battery life. Nevertheless, complete implementation of both functions can be complex and costly, especially for low voltage application such as standalone street lamps. In this paper, the operation of a solar battery charger for standalone street light systems is investigated. Using only one voltage sensor, the solar charger is able to operate in both MPPT and constant voltage (CV) charging mode, hence providing high performance at a low cost. Using a lab prototype and a solar simulator, the operation of the charger system is demonstrated and its performance under varying irradiance is validated.
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Kiirtaara Aravindhan,Karen Morgan,Sumaiyah Mat,Tengku Aizan Hamid,Rahimah Ibrahim,Nor Izzati Saedon,Kejal Hasmuk,Hazlina Mahadzir,Maw Pin Tan 대한노인병학회 2022 Annals of geriatric medicine and research Vol.26 No.4
Background: This study aimed to identify differences in quality of life before and during the coronavirus disease 2019 (COVID-19) pandemic and determine the influence of psychological status on the observed changes in the quality of life among older adults. Methods: The Malaysian Elders Longitudinal Research study recruited Malaysians aged at least 55 years from 2013 to 2015. Follow-ups were conducted between September and December 2020. Quality of life was determined using the 12-item Control, Autonomy, Self-Realization, and Pleasure questionnaire. Psychological statuses were assessed using the 21-item Depression Anxiety and Stress Scale, 15-item Geriatric Depression Scale, and 4-item Perceived Stress Scale. Results: This study included data from 706 individuals (mean age, 73.3±6.8 years). We observed reduced quality of life and increased anxiety among 402 (43.1%) and 144 (20.9%) participants, respectively. Participants felt “out of control,” “left out,” “short of money,” and “life was full of opportunities” less often and could “please themselves with what they did” more often. Multivariate analyses revealed increased depression, anxiety, and stress as independent risk factors for reduced quality of life. Conclusion: Individuals with increased depression, anxiety, and stress levels during the pandemic experienced a worsening quality of life. Thus, the development of effective strategies to address the mental health of older adults is needed to mitigate the effects of the pandemic on their quality of life.
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Wan Yaacob Wan Muhammad Hilmi,Long Idris,Zakaria Rahimah,Othman Zahiruddin 경희대학교 융합한의과학연구소 2021 Oriental Pharmacy and Experimental Medicine Vol.21 No.1
This study aims to evaluate the protective effects of Malaysian Tualang honey (TH) and its methanolic fraction (MTH) against oxidative stress, amyloid deposition and neuronal loss in the hippocampal tissue of lipopolysaccharide (LPS) rats. Sixty male Sprague Dawley rats were randomly divided into five groups: (1) control, (2) LPS (5 mg/kg), (3) LPS rats treated with 200 mg/kg TH, (4) LPS rats treated with 150 mg/kg MTH, and (5) LPS rats treated with 10 mg/kg memantine. The levels of catalase (CAT), glutathione peroxidase (GPx), glutathione reductase (GPr), superoxide dismutase (SOD), malondialdehyde (MDA), and beta-amyloid (Aβ) in the hippocampal tissues were determined using ELISA method. The CAT and GPx levels were significantly higher in all the treatment groups compared to the LPS group. The levels of GR and SOD were found to be significantly higher in the TH and memantine groups, and TH group, respectively. The TH and MTH groups, but not memantine, significantly lower MDA level compared to the LPS group. TH and memantine attenuated the effect of LPS where the levels of Aβ1−40 were higher and Aβ1−42 were lower compared to the LPS group. MTH, however, failed to lower the level of Aβ1−42. The number of Nissl-positive neurons in all hippocampal regions was significantly lower in the LPS group compared to the control group. Both TH and MTH treatments significantly ameliorate LPS-induced neuronal loss comparable to memantine, suggesting their neuroprotective potential. TH, however, exhibits slightly higher neuroprotective potential against oxidative stress and amyloid deposition when compared to MTH.
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Challenges in Volunteering from Cancer Care Volunteers Perspectives
Kamaludin, Kauthar Mohamad,Muhammad, Mazanah,Abdul Wahat, Nor Wahiza,Ibrahim, Rahimah Asian Pacific Journal of Cancer Prevention 2013 Asian Pacific journal of cancer prevention Vol.14 No.8
The involvement of non-government organizations (NGOs) and support groups has helped strengthen public health services in addressing cancer care burden. Owing to the contribution of volunteers in cancer care, this article documents a qualitative study that examined challenges in attracting and retaining cancer care volunteers as part of the effort to develop a volunteer recruitment model. Data were collected through three focus group discussions involving 19 cancer support group members in Malaysia. Findings of the study revealed that mobility and locality appeared to be significant in Malaysian context, while the need for financial support and time flexibility are challenges faced by cancer support groups to attract and retain volunteers. The findings imply that cancer care initiatives can benefit from more local volunteers but at the same time these volunteers require flexibility and financial support to sustain their engagement.
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