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All Journal JURNAL ILMIAH MATEMATIKA DAN TERAPAN Journal of Community Service: In Economic, Business, and Islamic Finance
Azim
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Economics, Econometrics & Finance Mathematics

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Model Matematika Kendali Optimal Intensitas Cahaya Dan Nutrisi Pada Pertumbuhan Mikroalga Dengan Menggunakan Metode Pontryagin Azim; Ratianingsih, R; Nacong, N
JURNAL ILMIAH MATEMATIKA DAN TERAPAN Vol. 17 No. 1 (2020)
Publisher : Program Studi Matematika, Universitas Tadulako

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (687.429 KB) | DOI: 10.22487/2540766X.2020.v17.i1.15173

Abstract

Microalgae are the most primitive plant-sized cellular organisms commonly known as phytoplankton. The habitat of its life is in waters or humid places. This organism is a primary producer of water that has any capability to photosynthesis like any other high-level plants. This study examines mathematically the optimal control of light intensity and liquid waste nutrition in microalgae growth. Growth liter is done by setting the intensity of light in the process of glucose formation and nutrition tofu liquid waste, tapioca, industry, and households as the additional nutrients of microalgae. The Pontryagin maximun principles is used to determine the optimal control solution. The solution is solved from the state and co-state equation that stationery evaluated using the indexed performance maks 𝐽[𝑢1 + 𝑢2 ] = ∫ 𝐺(𝑡) − 𝑡𝑓 𝑡0 𝑆(𝑡) − 1 2 𝑢1 (𝑡) 2 − 1 2 𝑢2 (𝑡) 2𝑑𝑡 with the stationer condition that gives the optimal control 𝑢1 ∗ = 𝛾2𝛼2𝑄𝐵 and 𝑢2 ∗ = −𝛾5𝜌1𝑆. The results shows that before the optimal control of light intensity and nutrition of liquid waste is applied, the concentration of microalgae biomass becomes 5.915 g / liter on the 20th day stayed at the 105th day. The lipid quota with an initial value of 0.6 g/liter will decrease to 0.2 g / liter at 4th day which is the equilibrium point. Optimal control of the regulation of light intensity of 2-9 klux and liquid waste nutrition provided a significant increase in the amount of microalgae biomass and lipid quota, with the regulation of light intensity of 2- 9 klux and tofu liquid waste nutrition which gave the largest increase in the amount of microalgae biomass and lipid quota
What Role Does Service-Learning Play in Enhancing Vineyard Agro-Tourism in Duyu Village? Azim; Meylisa Aulia Zalianti; Sukmawati; Dewi Salmita; Fatma
Journal of Community Service: In Economics, Bussiness, and Islamic Finance Vol. 2 No. 1 (2024): July-December
Publisher : Fakultas Ekonomi dan Bisnis Islam Universitas Islam Negeri Datokarama Palu

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.24239/jcsebif.v2i1.3881.30-38

Abstract

This article presents a Community Service Program implemented in Duyu Village aimed at promoting the development of vineyard-based agro-tourism through the Service-Learning approach. The initiative responds to critical challenges faced by local farmer groups, particularly deficiencies in digital marketing and tourism management, which constrain their economic potential and sectoral growth. Employing a mixed-methods framework, the program engaged local farmers in a participatory needs assessment to identify existing gaps and co-develop targeted interventions. A series of workshops were conducted to build capacity in sustainable agricultural practices and digital marketing strategies, equipping farmers with the tools to effectively promote their vineyards as tourism destinations. Results demonstrate notable improvements in participants’ knowledge and skills, accompanied by increased income generated from agro-tourism activities. Nonetheless, constraints such as limited training duration and variable participant engagement were observed. Recommendations for future implementation include extending the duration of capacity-building sessions and establishing strategic partnerships with local stakeholders. Overall, this program underscores the effectiveness of integrating academic learning with community engagement in fostering sustainable rural tourism development.
Co-Authors Dewi Salmita Fatma Meylisa Aulia Zalianti Nasria Nacong Rina Ratianingsih sukmawati