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58 articles for “Roi”
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Research ArticleOpen accessIn the author namesImprovement of Rooftop Solar Panels Efficiency using Maximum Power Point Tracking Based on an Adaptive Neural Network Fuzzy Inference SystemI Made Ari Nrartha, I Made Ginarsa, Agung Budi Muljono et al.Rooftop solar panels are a strategy for achieving Indonesia's renewable energy goals, but their non-linear characteristics make them difficult to control, especially in the face of extreme weather changes. An effective controller is needed to optimize the power output of solar panels. This study proposes a Maximum Power Point Tracking (MPPT) controller based on an Adaptive Neural network Fuzzy Inference … …American Journal of Engineering and Applied Sciences, Vol. 16, Issue 1 · 19 Jan 2023 · 5,769 accessesView PDFCite
Research ArticleOpen accessIn the author namesFemale Entrepreneurship and Agritourism Cooperatives in the Greeκ Periphery: An OverviewDimitrios Stavroulakis, Stefanos Karagiannis, Roido Mitoula, Aristides PapagrigoriouThis study investigates the status of female entrepreneurs in the Greek countryside as formed in the recent years owed to the emergence of agritourism. Agritourism has provided opportunities for additional income in localities through the utilization of knowledge of traditional customs, recipes, folk art. Women entrepreneurs in the sector often function within a context of adverse circumstances, pertaining to their … …American Journal of Economics and Business Administration, Vol. 5, Issue 4 · 13 Mar 2014 · 7,572 accessesView PDFCite
Research ArticleOpen accessIn the author namesA Review of Acetol: Application and ProductionMohd Hanif Mohamad, Roila Awang, Wan Md Zin Wan YunusProblem statement: Acetol is used as organic intermediates because it contains both hydroxyl and carbonyl functional groups and mainly use to produce polyols and acrolein. It also widely uses as reduced dyes and skin tanning agent. The commercially used acetol is made from petroleum-based that leads to high cost of production. Approach: This review highlighted applications of acetol and established … …American Journal of Applied Sciences, Vol. 8, Issue 11 · 5 Oct 2011 · 11,827 accessesView PDFCite
Research ArticleOpen accessIn the author namesEnzymatic Synthesis of Palm Alkyl Ester Using Dialkyl Carbonate as an Alkyl DonorsRoila Awang, Choo Yuen MayProblem statement: Though efficient in terms of reaction yield and time, the chemical approach to synthesizing alkyl ester has drawback such as difficulties in the recovery of glycerol and the need for removal of salt residue. On the other hand, biocatalyst allow for synthesis of specific alkyl esters and easy recovery of glycerol. However, the solvent-free alcoholysis, does not give … …American Journal of Applied Sciences, Vol. 7, Issue 8 · 31 Aug 2010 · 7,235 accessesView PDFCite
Research ArticleOpen accessIn the author namesSustainable Regional DevelopmentHelen Theodoropoulou, Roido Mitoula, Malvina VamvakariProblem statement: Demographic changes have increased the social and cultural diversity of tourist areas with historical heritage and natural beauty in Greece, causing an expansion in the cultural and economic horizons of local people and producing at the same time conflicts in their interests, values and lifestyles. This research was focused in the concept of sustainable development in three areas … …Journal of Social Sciences, Vol. 5, Issue 2 · 30 Jun 2009 · 7,668 accessesView PDFCite
Research ArticleOpen accessIn the author namesCharcoal-Oil Mixture as an Alternative Fuel: A Preliminary StudyRoila Awang, Choo Yuen MayThe fast depletion of fuel oil and continuous increase in the demand for power is a global issue. The world energy consumption is projected to grow at an average of 2.7-3.7% from 1996 to 2010. Therefore search for alternative fuel is highly prioritized. Thus this study presents the results on the characteristic of charcoal-oil mixture as an alternative fuel. The … …American Journal of Applied Sciences, Vol. 6, Issue 3 · 31 Mar 2009 · 7,556 accessesView PDFCite
Research ArticleOpen accessIn the author namesApplied Issues of Agritourism Cooperation and Sustainable Endogenous DevelopmentHelen Theodoropoulou, Roido Mitoula, Olga Astara, Panagiotis KaldisThis research aims at examining how an agritourism cooperative and its activities promote endogenous development using local human, natural and technological resources in a sustainable way with other local production activities. Technology allows the agritourism cooperative to effectively use local resources and simultaneously to increase its competitiveness in marketing of products. So, the cooperative becomes more competitive in regional and … …American Journal of Applied Sciences, Vol. 5, Issue 11 · 30 Nov 2008 · 6,732 accessesView PDFCite
Research ArticleOpen accessIn the author namesImmobilization of Lipase from Candida Rugosa on Palm-Based Polyurethane Foam as a Support MaterialRoila Awang, Mohd Rafaei Ghazuli, Mahiran BasriLipase from Candida rugosa was immobilized onto palm-based polyurethane foam (PU), which the polymer was pre-soaked in co-immobilized agent. The activities of PU-immobilized lipase were tested by the esterification reaction of oleic acid and oleyl alcohol in hexane. The PU-immobilized lipase was then characterized in term of its thermal, operational and storage stability. The optimum temperature for native and PU-immobilized … …American Journal of Biochemistry and Biotechnology, Vol. 3, Issue 3 · 30 Sep 2007 · 7,478 accessesView PDFCite
Research ArticleOpen accessIn the author namesEffect of Hydroxylated Compounds on Properties and Emission of Palm BiodieselRoila Awang, Choo Yuen MayThe Malaysian Palm Oil Board (MPOB) attempted the search for a viable alternative fuel leading to a possible substitution to the conventional diesel since 1982, using palm oil derived fuel. Numerous studies have shown that most exhaust emission encountered with conventional diesel fuel are reduced with biodiesel,with the exception of nitrogen oxides (NOx). This paper is reported on the effect … …American Journal of Applied Sciences, Vol. 4, Issue 2 · 28 Feb 2007 · 7,144 accessesView PDFCite
Research ArticleOpen accessIn the author namesAn Investigation into the Use of the Least Significant Bit Substitution Technique in Digital WatermarkingKevin Curran, Xuelong Xi, Roisin ClarkeDigital imaging companies lose revenue each year to people who are illegally copying and using their images. One prevention mechanism is to digitally encode images making it difficult for others to copy. This could be done using digital fingerprinting or simply adding a visible watermark. The information is hidden in a way that should not attract attention, but make it … …American Journal of Applied Sciences, Vol. 2, Issue 3 · 31 Mar 2005 · 7,469 accessesView PDFCite