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All Journal EKSAKTA: Journal of Sciences and Data Analysis POSITRON Techno: Jurnal Penelitian Edu Sains: Jurnal Pendidikan Sains dan Matematika IJFAC (Indonesian Journal of Fundamental and Applied Chemistry) Al Ishlah Jurnal Pendidikan Jurnal Penelitian Sains Jurnal Penelitian Pendidikan IPA (JPPIPA) Jurnal Redoks JURNAL PENDIDIKAN TAMBUSAI Aptisi Transactions on Technopreneurship (ATT) Kinetika Suluah Bendang: Jurnal Ilmiah Pengabdian Kepada Masyarakat Pillar of Physics Education : Jurnal Berkala Ilmiah Pendidikan Fisika AJARCDE (Asian Journal of Applied Research for Community Development and Empowerment) Jurnal Teknologi International Journal of Research in Vocational Studies (IJRVOCAS) Aptekmas : Jurnal Pengabdian Kepada Masyarakat Chemical Engineering Journal Storage (CEJS) Proceeding ISETH (International Summit on Science, Technology, and Humanity) Internet of Things and Artificial Intelligence Journal Innovative: Journal Of Social Science Research Bioedunis Journal International Journal of Mechanics, Energy Engineering and Applied Science (IJMEAS) Applied Engineering, Innovation, and Technology Journal of Experimental and Applied Physics
Yohandri Bow
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Analisis Kinerja Gasifier Downdraft Bahan Baku Tempurung Kelapa dan Pelet Sekam Padi Ditinjau dari Komposisi Syngas dan Nilai Kalor Al-Insyrah, Eyza Recwika; Febriana, Ida; Fadhlurrahman, M Revanza; Bow, Yohandri
Jurnal Penelitian Sains Vol 27, No 1 (2025)
Publisher : Faculty of Mathtmatics and Natural Sciences

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.56064/jps.v27i1.1058

Abstract

Seiring dengan perkembangan industri, kebutuhan energi di Indonesia terus meningkat. Sumber energi di Indonesia masih didominasi oleh energi fosil seperti batubara, minyak bumi, dan gas alam, sementara energi terbarukan masih dianggap sebagai alternatif. Salah satu cara untuk mengurangi penggunaan energi fosil adalah dengan memanfaatkan energi terbarukan, seperti biomassa. Contoh sumber energi alternatif dari biomassa adalah tempurung kelapa dan pelet sekam padi. Biomassa dapat menghasilkan gas yang dapat digunakan sebagai bahan bakar, salah satunya melalui proses gasifikasi. Penelitian ini menggunakan jenis gasifikasi downdraft. Variabel yang divariasikan dalam penelitian ini adalah komposisi bahan baku. Hasil penelitian menunjukkan bahwa suhu reaktor optimum sebesar 750 oC dicapai pada komposisi bahan baku 50% tempurung kelapa dan 50% pelet sekam padi. Waktu nyala api optimum tercatat selama 42,7 menit pada komposisi bahan baku yang sama, sementara waktu nyala terendah tercatat selama 27 menit. Efisiensi termal tertinggi sebesar 58,39% juga dicapai pada komposisi bahan baku 50% tempurung kelapa dan 50% pelet sekam padi, sedangkan efisiensi termal terendah sebesar 30,23% ditemukan pada komposisi bahan baku 100% tempurung kelapa. Nilai kalor berbanding lurus dengan efisiensi termal, karena semakin tinggi nilai kalor yang dihasilkan, semakin besar pula efisiensi termalnya.
Karakteristik Syngas Dari Tempurung Kelapa Dan Pelet Kayu Jati Dengan Metode Gasifier Downdraft Ditinjau Dari Kecepatan Alir Udara Putra, Andhika Satria; Hajar, Ibnu; Salamah, Luthfia; Effendy, Sahrul; Bow, Yohandri
Jurnal Penelitian Sains Vol 27, No 1 (2025)
Publisher : Faculty of Mathtmatics and Natural Sciences

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.56064/jps.v27i1.1080

Abstract

Kebutuhan energi akan terus bertambah seiring dengan peningkatan konsumsi energi. Di Indonesia, sumber energi masih didominasi oleh energi fosil seperti batubara, minyak bumi, dan gas alam, sementara energi terbarukan masih dianggap sebagai alternatif. Salah satu cara untuk mengurangi penggunaan energi fosil adalah dengan memanfaatkan energi terbarukan seperti biomassa. Sumber energi alternatif dari biomassa seperti tempurung kelapa dan pelet kayu jati. Tempurung kelapa memiliki kandungan karbon tetap yang lebih besar dibandingkan pelet kayu jati, sedangkan pelet kayu mengandung zat-zat mudah menguap yang lebih besar daripada tempurung kelapa, dimana kedua kandungan ini berperan dalam proses gasifikasi. Biomassa dapat menghasilkan gas mampu bakar salah satunya melalui proses gasifikasi. Jenis gasifikasi yang digunakan penelitian ini yaitu downdraft. Variasi tidak tetap yang digunakan yaitu kecepatan udara. Dari hasil penelitian, diketahui bahwa suhu reaktor optimal adalah 760,6 C pada kecepatan 15,1 m/s. Waktu pembakaran optimal tercatat selama 45 menit pada kecepatan yang sama. Nilai LHV optimal pada kecepatan 15,1 m/s adalah 7.551,58 kJ/kg. Pengaruh kecepatan aliran udara berbanding lurus dengan komposisi syngas, karena semakin tinggi kecepatan aliran udara, semakin tinggi pula komposisi syngas yang dihasilkan.Kata Kunci: Biomassa, Downdraft, Gasifikasi, Syngas
The Decision Support System of Students Recruitment as Teacher Candidates using Multilevel Multi Attribute Utility Theory (MAUT) Wahid, Abdul; Muharram, Muharram; A. Rauf, Bakhrani; Agung, Muhammad; Yohandri, Yohandri; Baharuddin, Baharuddin; Sila, I Nyoman; Suyanta, Suyanta
Internet of Things and Artificial Intelligence Journal Vol. 2 No. 2 (2022): Volume 2, Issue 2, 2022 [May]
Publisher : Association for Scientific Computing, Electronics, and Engineering (ASCEE)

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (914.252 KB) | DOI: 10.31763/iota.v2i2.513

Abstract

Recruitment is an important aspect of human resource management at a university, particularly at Makassar State University. Selection is a step in the recruitment process that determines whether prospective students who apply are a good fit for the program of study. The advancement of information systems facilitates the recruitment registration process. The decision support system is present to assist decision-makers in receiving appropriate recommendations for prospective teacher students who have been selected. This study employs the MAUT method's development, which is carried out in stages, hence the Multi-Level MAUT. Because assessment metrics are classified, we combine several MAUT methods to reach a final decision. The algorithm used produces good results, namely the ability to rank correctly based on stakeholder preferences.
Optimization of Drying Time and Thermal Performance of Solar Dryer for Tekwan Products Based on Energy Balance Analysis Samosir, Devina Sanchia; Bow, Yohandri; Aswan, Arizal
TECHNO: JURNAL PENELITIAN Vol 14, No 1 (2025): TECHNO JURNAL PENELITIAN
Publisher : Universitas Khairun

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.33387/tjp.v14i1.9790

Abstract

Energy requirements for production efficiency can be obtained from fossil fuels or renewable energy sources. The traditional drying process in Tekwan production is often inefficient and weather-dependent. Solar-powered drying technology using photovoltaic panels can improve cleanliness, efficiency, and product quality, and is suitable for application in Indonesia. Traditional drying faces challenges in terms of time efficiency and product quality due to weather dependence. This study designed a drying device with tiered racks and an automatic motor for heat distribution. Tests were conducted at 40°C for 1 to 5 hours to analyze moisture content, energy efficiency, and exergy. Results showed a decrease in moisture content from 57.21% to 34% after 5 hours, although it did not meet the SNI 11 standard. The highest thermal efficiency was achieved at 4 hours (84.42%), exergy efficiency was 77.61%, and the lowest exergy loss was 0.520 kJ/mol. Environmental factors, such as humidity and airflow speed, influence performance. Heat loss through convection and radiation remain the main challenges. Design improvements are needed to reduce heat loss and achieve optimal drying.
Pelatihan Kesiapsiagaan Menghadapi Bencana untuk Masyarakat yang Berada Di ‘’Seismic Gap’’ Desa Muara Siberut Razi, Pakhrur; Yohandri, Yohandri; Sudiar, Nofi Yendri; ifdil, ifdil; Thamrin, Thamrin; Asrizal, Asrizal
Suluah Bendang: Jurnal Ilmiah Pengabdian Kepada Masyarakat Vol 22, No 1 (2022): Suluah Bendang: Jurnal Ilmiah Pengabdian Kepada Masyarakat
Publisher : Universitas Negeri Padang

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.24036/sb.02460

Abstract

Tingginya potensi bencana di daerah seismic gap di kepulauan mentawai telah menjadi perhatian yang serius baik pemerintah pusat maupun daerah. Selain potensi gempa bumi daerah ini juga memiliki potensi diterjang tsunami jika gempa besar terjadi serta banjir. Oleh karena itu perlu dilakukan pelatihan berkelanjutan kepada masyarakat serta mengukur tingkat kesiapsiagaan mereka dalam menghadapi bencana. Program pelatihan ini merupakan bagian dari kegiatan untuk menciptakan desa/nagai tangguh bencana berdasarkan standar SNI desa tangguh necana dan Sendai framework disaster reduction. Selain peningkatan pengetahuan masyarakat tentang potensi bencana di seismic gap kepulauan mentawai, juga dilakukan pelatihan serta pengukuran tingkat kesiapsiagaan masyarakat terhadap bencana. Berdasarkan hasil survey yang laksanakan setelah dilakukan pelatihan, menunjukkan bahwa tingkat kesiapan Individu/keluarga terhadap kesiapsiagaan dalam menghadapi bencana berada pada level utama dengan skor >50.
Kinerja Unggul Ceramic Raschig Ring dalam Peningkatan Kualitas Biogas Pome melalui Metode Absorpsi Kimia Menggunakan KOH Najwa, Cholida; Bow, Yohandri; Lety, Trisnaliani
Chemical Engineering Journal Storage (CEJS) Vol. 5 No. 05 (2025): Chemical Engineering Journal Storage (CEJS)-October 2025
Publisher : LPPM Universitas Malikussaleh

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.29103/cejs.v5i05.23933

Abstract

Biogas dari Palm Oil Mill Effluent (POME) memiliki potensi besar, namun kualitasnya rendah akibat impuritas korosif seperti CO2​ dan H2​S. Penelitian ini bertujuan memurnikan biogas (CH₄ awal 53,02%) melalui absorpsi kimia dengan larutan Kalium Hidroksida (KOH). Kinerja dua media isian, Kaldness (polimer) dan Ceramic Raschig Ring (keramik), dievaluasi dalam kolom absorber dengan memvariasikan konsentrasi KOH (1,5–2,5 M) dan laju alir (1,0–1,4 L/menit). Hasilnya secara konsisten menunjukkan Ceramic Raschig Ring lebih unggul. Konfigurasi optimal dicapai pada konsentrasi KOH 2,5 M dan laju alir 1,4 L/menit, yang meningkatkan kadar CH₄ menjadi 78,20% (efektivitas 47,49%), serta menurunkan CO2​ dan H2​S masing-masing sebesar 67,88% dan 78,83%. Disimpulkan bahwa keunggulan Ceramic Raschig Ring disebabkan oleh sifat permukaannya yang hidrofilik dan kasar, yang meningkatkan transfer massa secara signifikan dibandingkan Kaldness yang hidrofobik, membuktikan efektivitas metode ini untuk produksi biometana.
Performance Evaluation of 119.88 kWp IoTBased On-Grid Solar System at Admin Building Grissik Putra, Asri Eka; Hasan, Abu; Bow, Yohandri
EKSAKTA: Journal of Sciences and Data Analysis VOLUME 6, ISSUE 2, October 2025
Publisher : Fakultas Matematika dan Ilmu Pengetahuan Alam

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.20885/EKSAKTA.vol6.iss2.art8

Abstract

The global rise in carbon emissions has intensified the urgency of transitioning toward renewable, environmentally friendly and sustainable energy systems, particularly in industrial sectors with high fossil fuel dependency such as oil and gas. Solar panels represent a clean and reliable alternative for electricity generation. This research evaluates the performance of a 119.88 kWp monocrystalline solar panel system integrated with an Internet of Things (IoT)-based on-grid monitoring system at the Grissik Administration Building. Over a 30-day observation period, the solar panels supplied an average of 432 kWh/day, approximately 72.07% of the installed capacity, reducing fuel gas consumption by 0.19 MMSCFD and lowering CO₂ emissions by 10.38 tons. System efficiency exceeded 80% under optimal irradiation conditions. The IoT-based monitoring platform facilitated real-time data and system control, improving operational decision-making and reliability. This research provides novel empirical evidence of field-scale performance of IoT-integrated photovoltaic systems within Indonesia’s oil and gas facilities, demonstrating their significant role in enhancing industrial energy efficiency and supporting the national clean energy transition.
Internet of Things Based Temperature and pH Stabilization Control System in The Pome Biodigester Fermentation Process at PLTBg Mustofa; Dewi, Tresna; Bow, Yohandri
International Journal of Mechanics, Energy Engineering and Applied Science (IJMEAS) Vol. 3 No. 3 (2025): IJMEAS - September
Publisher : Yayasan Ghalih Pelopor Pendidikan (Ghalih Foundation)

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.53893/ijmeas.v3i3.433

Abstract

The Government of Indonesia is striving to reduce dependence on fossil fuels by increasing the use of renewable energy (RE), with a target of achieving 23% by 2025. Biogas Power Plants (PLTBg) are one of the solutions that utilize palm oil mill effluent (POME) to produce biogas through anaerobic fermentation. The currently operating systems face problems and challenges in monitoring and operating mesophilic digesters, particularly covered lagoon types, which are managed conventionally, resulting in frequent drops in temperature and pH levels. To address these issues, automation was implemented in the temperature and pH control systems, with the expectation of increasing biogas production. This study adopted an approach that involved recording temperature and pH data, analyzing their upper and lower thresholds, and developing a laboratory-scale model that simulates industrial conditions. This model was equipped with a temperature and pH control system, along with monitoring and control coding. In the laboratory-scale POME digester prototype using actual POME liquid as the test medium, it was demonstrated that temperature and pH could be effectively monitored and controlled by automatically regulating the POME pump motors. The study results show that temperature control was maintained within the range of 38–41 °C, and pH control within the range of 6.5–8. The temperature drop from 40 °C to 35 °C occurred over 274 minutes. The temperature control response time was 5.6 seconds. The pH decrease rate due to the addition of fresh POME was 2.04, with a pH control response time of 8.5 seconds.
Design and Development Of Inorganic Fertilizer Packaging System With Iot-Based Tally Counter Apriani, Akmecia Risqa; Yohandri, Yohandri
Journal of Experimental and Applied Physics Vol 1 No 1 (2023): June Edition
Publisher : Department of Physics, Universitas Negeri Padang

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.24036/jeap.v1i1.1

Abstract

Inorganic fertilizers are fertilizers derived from chemical products produced by factories. This chemical, if inhaled, will seriously affect retail fertilizer sellers. Currently, sellers of diluted fertilizers still pack fertilizer manually, which takes a long time, as well as excessive labor and frequent fraud by employees against business owners and employees. The packaging system is engineering research aimed at determining the performance and design specifications of the system. The performance specification describes the performance of the packaging system, while the design specification describes the tool's sensor characteristics, accuracy, and precision. Data obtained through direct and indirect measurements. The direct measurement results are obtained from measuring the mass and detection distance of the packaging. In contrast, the indirect measurement results are obtained from the accuracy and precision of the tool. The results obtained on the system are performance specifications and tool design. The mechanical form of the device is obtained from the performance specifications. Then the system will detect the packaging that can be seen through the smartphone. The results obtained in this system are performance specifications and tool design. The mechanical form of the tool is obtained from the performance specifications. The system will measure the mass and detection distance of the packaging. The number of packaging can be seen through a smartphone. The accuracy of the packaging system to the mass is 99.82%, while the tool's accuracy to the mass is 99.52% which is obtained from the accuracy of measuring object 1.
IoT-based Pyranometer Using Photodiode Sensor Widiartha, Wahyu Dewa; Yohandri, Yohandri
Journal of Experimental and Applied Physics Vol 1 No 1 (2023): June Edition
Publisher : Department of Physics, Universitas Negeri Padang

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.24036/jeap.v1i1.5

Abstract

Solar irradiance is one of the critical parameters of climatology because it is the driver of most of the dynamic processes in the atmosphere. We need a tool to measure solar irradiance, such as a pyranometer. However, the pyranometer has the disadvantage that it requires cables and electricity to send data to data processing devices, which sometimes causes data loss problems if the connecting cable is damaged unnoticed and a sudden power outage occurs. An IoT-based pyranometer using a photodiode sensor will overcome this problem because the tool will send the measured solar irradiance data directly to the internet. The objective of this research is to minimize the measurement data loss that occurs and to ensure the data quality. This is possible because the device operates with solar cells that constantly recharge the battery. This research is a type of engineering research. The measurement technique used is a direct measurement, comparing solar irradiance data with a standard pyranometer, then indirectly analyzing the accuracy and precision of the design tool. Based on direct testing of the tool, an accuracy and precision rate close to 100% was achieved, which was 98.19% and 98.63%, respectively. Therefore, it can conclude that the tool can work well. Moreover, measurements were also conducted at BMKG Sicincin on July 13, 2022 from 08:56 to 15:10, resulting in a measurement percentage of 4.87% with the highest solar irradiance at 12:15.
Co-Authors ,, Tahdid ., Zurohaina Abdul Razak Abdul Wahid Abu Hasan Abu Hasan Afrianda, Teguh Ahmad Taqwa Aida Syarif AIDA SYARIF Al-Insyrah, Eyza Recwika Ali Ahmad Alwi Nofriandi Anisa, Widya Anwar, Suci Apriani, Akmecia Risqa Arif Budiman Arissetyadhi, Iwan Arizal Aswan Asrizal Audia, Washilla Aulia Asman Ayu Permata Sari Bachty, Hadri Baharuddin Baharuddin BAKHRANI RAUF Bayu Saputra Budiman, Ria Daniar, Rima Darozat, Fajar Mukharom Diah Iswandari Diah Rahmawati Effendy, Sahrul Erlinawati . Fadhlurrahman, M Revanza Fatahul Arifin Fatahul Arifin, Fatahul Fatria Fatria Fatria Febriana, Ida Festiyed Fitri Arsih Gabe, Totop Harjadi Gunawan Harliyani, Ayu Dwi Heru Afriansyah I Nyoman Sila Ibnu Hajar Ichsan Astanto Idham Mahenri Ifdil Ifdil Illahi, Kurnia Indah Purnamasari Isdaryanto Iskandar Jaya Utama Putra Jhora, Fadhila Ulfa Juanta, Palma Kalsum, Leila Kholidah , Nurul Leila Kalsum Leila Kalsum Lety, Trisnaliani Lufri Lufri M. Amir M. Reza Ramlan M. Syahirman Yusi Mahardhika, Lintang Putri Mairizwan, Mairizwan Manggala, Agus Marambang, Alfi Yory Maryam Seyaski Fitria Melta, Defrian Minda Azhar Miranda Roulina Miranda Roulina T Monica, Levia Moyo, Kgomotso Muhammad Agung Muhammad Reza Ramlan Muhammad Taufik Muhammad Yerizam Muhammad Zulfahmi Muharram, Muharram Mustofa Mustofa Najwa, Cholida Nedia Sandika Nofi Yendri Sudiar Novarini, N Pakhrur Razi Prakoso, Dibyo Putra, Andhika Satria Putra, Asri Eka Putra, M. Rizky Adhitya Rahmadina, Nisa RD Kusumanto Reza Angraini Rhevy Liandari Rifa'i, Ahmad Imam Riri Jonuarti Robby Setiadi Robert Junaidi Robiansyah RR. Ella Evrita Hestiandari Rusdianasari Rusdianasari Rusdianasari Rusdianasari Salamah, Luthfia Samosir, Devina Sanchia Santosa, Tomi Apra sari, Desi Nurmala Sari, Mona Sari, Mona Berlian Septiana, Iriani Reka Shela Dilen Putri Siagian, Gunaria Sigit Kurniawan Sirajuddin Skunda Diliarosta Sofianora, Aulia Suaidi Ahadi Sundari, Okta Sutini Pujiastuti Lestari Sutini Pujiastuti Lestari Suyanta Suyanta Syakdani, Adi Tahdid . Thamrin Thamrin Tresna Dewi Wibby Aditya Putra Utama Widiartha, Wahyu Dewa Winiasri, Linda Wiranata, Muhammad Adithia WULANDARI, NILA Yenni Darvina Yerimadesi Yerimadesi Yulifarma, Rika Yulkifli Yulkifli Yusi, Syahirman Zakiyah Sri Rezeki Zikri, Ahmad Zulhendri Kamus Zulma, Degito Zulyusri Zulyusri