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All Journal Journal of Engineering Science and Technology Management JES-TM Social and Community Service
Salma Liska
Universitas Riau
Chemical Engineering, Chemistry & Bioengineering Civil Engineering, Building, Construction & Architecture Control & Systems Engineering Decision Sciences, Operations Research & Management Education Electrical & Electronics Engineering Engineering Other

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Edukasi Pemanfaatan Minyak Jelantah Menjadi Sabun Ramah Lingkungan melalui Media Leaflet Lisa Legawati; Yola Bertilsya Hendri; Yogi Yolanda; Salma Liska; Muhammad Iwan Fermi; Zulfansyah; Sri Rezeki Muria
Journal of Social and Community Service Vol. 5 No. 1 (2026): Maret 2026
Publisher : Faculty of Engineering University of Pahlawan Tuanku Tambusai

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.31004/jestmc.v5i1.443

Abstract

Minyak jelantah merupakan limbah rumah tangga yang masih sering dibuang langsung ke lingkungan tanpa pengolahan sehingga berpotensi menimbulkan pencemaran air dan tanah. Selain itu, penggunaan minyak goreng secara berulang dapat menurunkan kualitas minyak dan berisiko terhadap kesehatan. Kegiatan pengabdian ini bertujuan meningkatkan pengetahuan dan kesadaran masyarakat mengenai pengelolaan minyak jelantah melalui pemanfaatannya menjadi sabun ramah lingkungan. Kegiatan dilaksanakan di RT 002/RW 014 Kelurahan Simpang Baru, Pekanbaru, dengan jumlah peserta sebanyak 12 orang. Metode yang digunakan meliputi penyampaian materi secara langsung, pembagian edukatif, serta evaluasi menggunakan pretest dan posttest. Hasil kegiatan menunjukkan adanya peningkatan pemahaman peserta setelah edukasi diberikan. Peserta juga memberikan respon positif terhadap leaflet karena informasi disajikan secara ringkas, visual, dan mudah dipahami. Dengan demikian, kegiatan pengabdian melalui media leaflet efektif meningkatkan pengetahuan masyarakat serta mendorong pemanfaatan minyak jelantah menjadi produk bernilai guna dan ramah lingkungan.
Dynamic Modeling and Nyquist Stability Analysis of a Non-Interacting Two-Tank Series Thermal System Yogi Yolanda; Yola Bertilsya Hendri; Salma Liska; Lisa Legawati; Suhendri Suhendri; Alltop Amri Ya Habib; Zulfansyah Zulfansyah
Journal of Engineering Science and Technology Management (JES-TM) Vol. 6 No. 2 (2026): JES-TM 2026
Publisher : Journal of Engineering Science and Technology Management

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.31004/jestm.v6i2.431

Abstract

Series tank systems are vital in chemical industries but susceptible to mass and thermal disturbances, making stability analysis essential. This study models the level and temperature dynamics of a non-interacting two-tank system equipped with a heater in Tank-01, analyzing its stability via Nyquist plots. The methodology involves laboratory step-response experiments validated against mathematical models derived using Laplace Transforms and Explicit Euler methods. Results demonstrate the model closely matches experimental data; Tank-01 exhibits first-order characteristics, while Tank-02 functions as a second-order system. The physical system successfully handled +52% and -35% step disturbances within liquid height limits of 3–24 cm and feed flow rates of 40.33–136.5 cm³/s. Furthermore, Nyquist analysis confirms the open-loop thermal process is inherently stable across all tested capacities. Maximum level and thermal process gains were 0.3787 and 0.0062, respectively. Ultimately, this study confirms the non-interacting two-tank system possesses stable, self-regulating characteristics against load disturbances within operational limits.
Co-Authors Alltop Amri Ya Habib Lisa Legawati M. Iwan Fermi Sri Rezeki Muria Suhendri Suhendri Yogi Yolanda Yola Bertilsya Hendri Z Zulfansyah Zulfansyah Zulfansyah