R
Roslan Umar
Researcher at Universiti Sultan Zainal Abidin
Publications - 99
Citations - 1048
Roslan Umar is an academic researcher from Universiti Sultan Zainal Abidin. The author has contributed to research in topics: Radio astronomy & Radio telescope. The author has an hindex of 14, co-authored 91 publications receiving 814 citations. Previous affiliations of Roslan Umar include Universiti Teknologi MARA & University of Malaya.
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A review of biomass-derived heterogeneous catalyst for a sustainable biodiesel production
Sharifah Hanis Yasmin Sayid Abdullah,Nur Hanis Mohamad Hanapi,Azman Azid,Roslan Umar,Hafizan Juahir,Helena Khatoon,Azizah Endut +6 more
TL;DR: A review of bio-based heterogeneous catalysts utilized for sustainable biodiesel production and their suitability for industrial application is presented in this article, where the use of these biomass derived catalysts provides a greener synthesis route for biodiesel synthesis.
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Spatial assessment and source identification of heavy metals pollution in surface water using several chemometric techniques.
Azimah Ismail,Mohd Ekhwan Toriman,Hafizan Juahir,Sharifuddin M. Zain,Nur Liyana Abdul Habir,Ananthy Retnam,Mohd Khairul Amri Kamaruddin,Roslan Umar,Azman Azid +8 more
TL;DR: The results revealed that one state representing each cluster (northern and southern regions) is significant as the main location for investigating heavy metal concentration in the Straits of Malacca which would save monitoring cost and time.
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Optimization of biodiesel production by solid acid catalyst derived from coconut shell via response surface methodology
Azizah Endut,Sharifah Hanis Yasmin Sayid Abdullah,Nur Hanis Mohamad Hanapi,Siti Hajar Abdul Hamid,Fathurrahman Lananan,Mohd Khairul Amri Kamarudin,Roslan Umar,Hafizan Juahir,Helena Khatoon +8 more
TL;DR: In this paper, a novel acid catalyst was prepared via sulfonation of incompletely carbonized coconut shell using concentrated sulfuric acid, and the design of experiments were performed using four factor-three-level central composite design coupled with response surface methodology to evaluate the interaction between two factors to determine the optimum process conditions.
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Assessment of Total Suspended Sediment and Bed Sediment Grains in Upstream Areas of Lata Berangin, Terengganu
Noorjima Abd Wahab,Mohd Khairul Amri Kamarudin,Muhammad Barzani Gasim,Roslan Umar,Frankie Marcus Ata,Nur Hishaam Sulaiman +5 more
TL;DR: In this paper, a study was carried out in the upstream area, Lata Berangin, Hulu Keruak, Besut, Terengganu, and Besut to prove the sedimentation problem, especially the formation of total suspended sediment (TSS) and the bed sediment grain size.
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Identification source of variation on regional impact of air quality pattern using chemometric
Azman Azid,Hafizan Juahir,Ezureen Ezani,Mohd Ekhwan Toriman,Azizah Endut,Mohd Nordin Abdul Rahman,Kamaruzzaman Yunus,Mohd Khairul Amri Kamarudin,Che Noraini Che Hasnam,Ahmad Shakir Mohd Saudi,Roslan Umar +10 more
TL;DR: In this paper, the effectiveness of hierarchical agglomerative cluster analysis (HACA), discriminant analysis (DA), principal component analysis (PCA), factor analysis (FA), and multiple linear regressions (MLR) for assessing the air quality data and air pollution sources pattern recognition were applied.