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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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Religion Aerospace Engineering Agriculture, Biological Sciences & Forestry Arts Humanities Astronomy Automotive Engineering Biochemistry, Genetics & Molecular Biology Chemical Engineering, Chemistry & Bioengineering Chemistry Civil Engineering, Building, Construction & Architecture Computer Science & IT Control & Systems Engineering Decision Sciences, Operations Research & Management Dentistry Earth & Planetary Sciences Economics, Econometrics & Finance Education Electrical & Electronics Engineering Energy Engineering Environmental Science Health Professions Immunology & microbiology Industrial & Manufacturing Engineering Languange, Linguistic, Communication & Media Law, Crime, Criminology & Criminal Justice Library & Information Science Materials Science & Nanotechnology Mathematics Mechanical Engineering Medicine & Pharmacology Neuroscience Nursing Physics Public Health Social Sciences Transportation Veterinary Other

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Syngas Generation in a Crossdraft Gasifier System Using a Rice Strew Filter Yohandri Bow; Isdaryanto Iskandar; Harjadi Gunawan
International Journal of Research in Vocational Studies (IJRVOCAS) Vol. 2 No. 3 (2022): IJRVOCAS - December
Publisher : Yayasan Ghalih Pelopor Pendidikan (Ghalih Foundation)

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.53893/ijrvocas.v2i3.154

Abstract

One solution to the fossil energy crisis is to use alternative energy, such as coal conversion. Coal may be utilized as an alternative energy source via a variety of methods, one of which being gasification. Gasification is a thermochemical process that converts a solid fuel into a combustible fuel in the presence of less oxygen than is necessary for stoichiometric combustion. One of the gasification methods involves utilizing a crossdraft gasifier system using rice straw as a syngas filter. The goal of this research is to determine the ideal temperature for producing syngas with the highest efficiency through the gasification process. According to study, the most ideal temperature for producing excellent quality syngas is acquired at 750°C with syngas concentration of CH4 1.99%, CO 7.97%, CO2 9.03%, H2 6.82%, O2 12.11%, 62.08% N2 and 16.56% efficiency reached at 650oC.
Improving the Capacity of Physics Teachers in the Development of Laboratory Experiment Kits Based on Video Analysis and Modeling Tool Mairizwan, Mairizwan; Kamus, Zulhendri; Asrizal, Asrizal; Yohandri, Yohandri
PILLAR OF PHYSICS EDUCATION Vol 16, No 3 (2023)
Publisher : Universitas Negeri Padang

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.24036/2632171074

Abstract

Science subjects really need a learning model that makes students learn a lot from experience, not from verbal speeches and memorizing concepts given by the teacher. Experience can only be gained through practical activities and experiments which can ultimately improve students' science process skills. The reality in the field shows that physics experimental activities cannot be carried out optimally because a lot of equipment cannot be operated, the number of experimental sets is not enough and the equipment needed is quite expensive. The aim of this research is to increase teachers' skills in developing low-cost laboratory experimental kits by combining technology from video analysis and modeling tools with the research object being the physics MGMP teachers of Agam district. Implementation stages include providing training/workshops, practical implementation and evaluation of results. After carrying out this activity stage, the results obtained are video analysis products from participants and student worksheets. The results of this research can be analyzed and concluded that physics teachers' understanding and skills in carrying out video-based practical activities have increased due to limited practical equipment in the laboratory. The increase in participants' understanding can be seen from the results and their satisfaction with the implementation of laboratory experiment kit development activities based on video analysis and modeling tools. Therefore, improving these skills has a very good impact on teachers to increase learning variations that attract students' interest, and assist students in understanding Physics concepts correctly and being able to find their best potential
Argument-driven inquiry learning model to improve students' argumentation skills in science learning: systematic literature review Melta, Defrian; Azhar, Minda; Yohandri, Yohandri; Arsih, Fitri; Razak, Abdul
Edu Sains: Jurnal Pendidikan Sains & Matematika Vol 12 No 1 (2024): VOLUME 12 NOMOR 1 JUNI 2024
Publisher : IAIN Palangka Raya

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.23971/eds.v12i1.5843

Abstract

This research aims to identify and describe the Argument-Driven Inquiry (ADI) learning model to improve students' argumentation skills in science learning. The method used in this research is the Systematic Literature Review (SLR) method. From the search strategy results, 75 articles were found from 2017 to 2023, then selected gradually and systematically into 20 articles relevant to the topic of the ADI model in science learning. The analysis of journal article reviews based on SLR proves that the ADI learning model can be implemented using various learning media and significantly influences students' argumentation abilities in science learning. Apart from that, this argumentation ability also provides improvement for students who have different academic abilities. The ADI model can also improve other skills, such as understanding concepts, critical thinking, and learning outcomes.
Implementation of the Internet of Things for Monitoring and Protecting Hydrogen Production in Dry Cell HHO Generators Robby Setiadi; Taqwa, Ahmad; Bow, Yohandri
International Journal of Research in Vocational Studies (IJRVOCAS) Vol. 3 No. 2 (2023): IJRVOCAS - August
Publisher : Yayasan Ghalih Pelopor Pendidikan (Ghalih Foundation)

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.53893/ijrvocas.v3i2.203

Abstract

In the last few decades, researchers have been conducting various studies in search of alternative energy sources to reduce dependence on fossil fuels and anticipate future energy scarcity. One such alternative energy is hydrogen, which can be obtained through various methods, including electrolysis of water. Hydrogen possesses the characteristics of being flammable, odorless, colorless, and tasteless, necessitating the development of a rigorous monitoring and protection system to mitigate potential hazards. In this study, a monitoring and protection system was designed for the operation of an electrolyzer using a Dry Cell type HHO Generator. The system employs the concept of the Internet of Things, where data is connected through the internet network. The data received includes hydrogen concentration readings, electrolyzer operation automation, electrolyzer operating status, and hydrogen gas leak detection in the system. The research results obtained showed that the higher the concentration of electrolyte and the voltage supplied to the electrolysis process, the faster the production of hydrogen gas is accelerated, accompanied by an increase in temperature. If a leakage occurs in a system, the occurrence of the fire triangle will be faster when the concentration of electrolyte and the voltage supplied are greater.
The Comparison of Hydrogen Purity on Brown’s Gas Using Dry Cell Electrolyzer with/without Polyvinyl Alcohol (PVA) Separator Membrane Rahmadina, Nisa; Bow, Yohandri; Yusi, Syahirman
International Journal of Research in Vocational Studies (IJRVOCAS) Vol. 3 No. 2 (2023): IJRVOCAS - August
Publisher : Yayasan Ghalih Pelopor Pendidikan (Ghalih Foundation)

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.53893/ijrvocas.v3i2.205

Abstract

Global environmental issues that demand good air quality have encouraged various energy sources to develop environmentally friendly energy. Brown’s Gas is produced by using an electrolysis system to separate water into Hydrogen (H2) and Oxygen (O2) gas. The dry cell is an electrolyzer that is widely used for both small and large-scale hydrogen production systems. A dry cell electrolyzer was designed with 12 stages of 316 stainless steel with Polyvinyl Alcohol as a polymer membrane to prevent mixing H2 and O2 to get a high percentage of hydrogen purity. This study compares hydrogen purity on Brown’s gas using a dry cell electrolyzer with PVA with/without a PVA separator membrane. The result shows that the PVA membrane significantly impacted hydrogen purity. The hydrogen purity on Brown’s gas without PVA membrane for KOH, NaOH, KCl, and Seawater was 58.37%, 56.42 %, 50.16%, and 55.22 %. Compared to using the membrane was 78.32%, 77.80%, 63.16%, and 74.0 %, with the highest hydrogen obtained was KOH electrolyte.
Performance Test of the Molecularly Imprinted Polymer (MIP) Endosulfan Sensor Potentiometrically Bow, Yohandri; Syakdani, Adi; Purnamasari, Indah; Rusdianasari
International Journal of Research in Vocational Studies (IJRVOCAS) Vol. 3 No. 3 (2023): IJRVOCAS - December
Publisher : Yayasan Ghalih Pelopor Pendidikan (Ghalih Foundation)

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.53893/ijrvocas.v3i3.220

Abstract

Molecularly Imprinted Polymer (MIP) is a synthetic polymer with cavities that are specific for target molecules. Cavities are obtained as a result of template removal, where the function of these cavities is to recognize molecules with the same size, structure and physicochemical properties as them. The polymer produced from the MIP technique is applied to the surface of the sensor material as an endosulfan detection and analyzing instrument. The advantage of MIP is that it is a sensor system that is able to provide analysis results for contamination quickly, easily and in low concentrations (ppm). The aim of this research is to make MIP endosulfan as a contamination sensor and potentiometrically test its performance. The research results showed that the optimum conditions for making Molecularly Imprinted Polymer (MIP) endosulfan were obtained with a composition of 6.02 mL of chloroform; endosulfan 0.025 g; 0.9 mL methacrylic acid (MAA); 1.57 mL ethylene glycol methacrylic acid (EGMA); 0.07 g benzoyl peroxide (BPO) with a heating time of 150 minutes at a temperature of 70 oC. The sensor performance test was carried out potentiometrically and it was found that the endosulfan MIP sensor had sensitivity and stability in the concentration range of 0.01-1.0x10-6 ppm with a detection limit of 0.01x10-6 ppm and a service life of 90 days.
Synthesis and Characterization of Silicon Nanoparticles from Coal Fly Ash Using Ultrasonication as a Battery Anode Robiansyah; Bow, Yohandri; Dewi, Tresna
International Journal of Research in Vocational Studies (IJRVOCAS) Vol. 4 No. 2 (2024): IJRVOCAS - August
Publisher : Yayasan Ghalih Pelopor Pendidikan (Ghalih Foundation)

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.53893/ijrvocas.v4i2.282

Abstract

Fly ash, a byproduct of coal combustion, is rich in silica, alumina, and other minerals, making it a valuable resource for extracting high-purity silicon. The synthesis of silicon nanoparticles from coal fly ash involves several critical steps, including the extraction of silica (SiO2) via the sol-gel method, reduction of silica to silicon using the metallothermic method, and subsequent ultrasonication to achieve nanoscale particles. Studies have shown that fly ash can contain up to 49.21% silica, which can be further purified to 93.52% via chemical extraction methods such as acid leaching and alkali dissolution. The reduction of silica to silicon is carried out using the metallothermic method, which involves the use of magnesium-reducing agents to convert SiO2 to elemental silicon. This process produces silicon with a purity of about 61.3%, which can be further increased through ultrasonication. Ultrasonication is a technique that uses high-frequency sound waves to break particles into smaller sizes, resulting in more uniform and homogeneous nanoparticles. In this study, ultrasonication for 60 and 120 min reduced the average particle size of silicon from 208.94 nm to 58.87 nm and 20.13 nm, respectively, and increased the silicon content to 74.6% and 72.7%. X-ray diffraction (XRD) and distribution particle analyses confirmed the particle size reduction and homogeneity of silicon nanoparticles, indicating the effectiveness of ultrasonication in producing high-quality silicon nanoparticles. The synthesized silicon nanoparticles have significant potential applications, particularly as anode materials in lithium-ion batteries, due to their increased surface area and improved electrochemical properties. Furthermore, the use of fly ash as a raw material for the synthesis of silicon nanoparticles not only provides a cost-effective and environmentally friendly alternative to traditional silica sources but also helps in reducing the environmental impact of fly ash disposal. The integration of the methods and findings of this study underscores the feasibility and benefits of using coal fly ash for the sustainable production of silicon nanoparticles, which can be utilized in energy storage as anode materials in lithium-ion batteries.
Integration of Dalihan Natolu's Local Wisdom in the Sets Learning Model to Improve Student's Problem Solving Ability Siagian, Gunaria; Yohandri, Yohandri; Razak, Abdul
AL-ISHLAH: Jurnal Pendidikan Vol 16, No 3 (2024): AL-ISHLAH: JURNAL PENDIDIKAN
Publisher : STAI Hubbulwathan Duri

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.35445/alishlah.v16i3.4161

Abstract

This study integrates the Science, Environment, Technology, and Society (SETS) learning model with the cultural framework of Dalihan Natolu (DNT), aimed at fostering active, effective, and creative learning. The objective was to examine the impact of this integrated DNT-SETS approach on students’ problem-solving skills, particularly in the context of environmental pollution. A quasi-experimental design was employed, involving 60 students from SMA GKPS Pematang Raya, divided into an experimental group (30 students) and a control group (30 students). The learning materials included lesson plans, student worksheets, learning model guides, and six essay questions related to environmental pollution, designed to assess problem-solving skills. Data were analyzed using the Kolmogorov-Smirnov test for normality and Levene's test for variance homogeneity, both at a 5% significance level. A t-test was conducted to determine the effectiveness of the DNT-SETS model. The t-test results showed a significance value of 0.000, indicating a statistically significant difference between the experimental and control groups. The experimental group, which used the DNT-SETS model, demonstrated a 59% improvement in problem-solving skills, compared to a 38% gain in the control group. This suggests the DNT-SETS model effectively enhanced students' abilities to address environmental issues. The integration of the DNT-SETS model enabled students to approach environmental problems holistically, linking scientific concepts with real-world challenges. This model encourages students to gather evidence and develop effective solutions based on their understanding. The DNT-SETS model significantly improves problem-solving skills in environmental education, offering a practical and culturally relevant teaching strategy.
Simulator Gempa Menggunakan Konsep Vibrating Table Berbasis Sensor MPU6050 Audia, Washilla; Yulkifli, Yulkifli; Nofriandi, Alwi; Yohandri, Yohandri; Ahadi, Suaidi
POSITRON Vol 14, No 2 (2024): Vol. 14 No. 2 Edition
Publisher : Fakultas Matematika dan Ilmu Pengetahuan Alam, Univetsitas Tanjungpura

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.26418/positron.v14i2.76159

Abstract

Indonesia merupakan salah satu negara dengan wilayah berpotensi gempa tertinggi di dunia, yang sering kali menimbulkan kerugian besar. Simulator gempa berbiaya rendah menjadi topik penting dalam berbagai penelitian untuk mendukung mitigasi bencana. Oleh karenanya, pengembangan dan pengujian vibrating table semakin banyak dilakukan di pusat penelitian teknik gempa di seluruh dunia. Penelitian ini bertujuan untuk mengembangkan simulator gempa berbasis konsep vibrating table yang hemat biaya, mudah digunakan, dan akurat, dengan memanfaatkan sensor MPU6050 untuk karakterisasi getaran. Sistem ini menggunakan motor DC sebagai sumber getaran, sementara sensor MPU6050 mendeteksi getaran yang terjadi saat simulator diujikan dan mengukur percepatan getaran yang dihasilkan. Purwarupa yang dikembangkan ini kemudian dikalibrasi menggunakan vibration meter sebagai alat ukur standar. Pada penelitian ini ditemukan bahwa variasi kecepatan putar motor (rpm) memengaruhi hasil respons dari percepatan getaran (m/s2) pada prototipe simulator gempa dan memiliki hubungan berbanding lurus.  Simulator ini memiliki tingkat ketepatan 96,1% dan ketelitian 99,6% setelah kalibrasi. Dengan demikian, purwarupa ini mampu menyimulasikan gempa dengan respons getaran yang akurat dan  menjadikannya solusi yang memiliki potensi dalam pengembangan teknologi mitigasi bencana yang terjangkau dan efektif.
Increasing the Photochemical Performance of Dye-Sensitized Solar Cell: The Effect of Mixed Dye from Areca Catechu and Tectona Grandis Extract Ahmad, Ali; Hasan, Abu; Bow, Yohandri
International Journal of Research in Vocational Studies (IJRVOCAS) Vol. 4 No. 3 (2024): IJRVOCAS - December
Publisher : Yayasan Ghalih Pelopor Pendidikan (Ghalih Foundation)

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.53893/ijrvocas.v4i3.301

Abstract

Dye Sensitized-Solar Cells (DSSC) represent a solar cell technology belonging to the third generation, functioning on the principles of the photoelectrochemical concept. The utilization of teak leaves (Tectona Grandis) and areca nut (Areca Catechu) as an organic dye in DSSC is accountable for the absorption of solar radiation. The stimulation of electrons induced by light in photocatalysis is greatly impacted by the band gap's specific location. For a material to act efficiently as a photocatalyst, it must possess a conduction band exhibiting a notably high positive potential in comparison to the potential of electron acceptance. The mixed of dye from teak leaves and areca nut increasing the absorption of the sunlight, thereby enhancing light absorption. The current study details the Mixing of areca nut and teak leaves extract to enhance the photochemical performance of DSSC and subsequently examined via FTIR, and UV-Vis analyses. A thorough examination of samples from mixed dye significantly impacts the elemental composition, and optical characteristics of the substance. The outcomes revealed that mixed dye from areca nut and teak leaves exhibited the most notable enhancement in DSSC efficiency, followed by teak leaves dye, whereas the areca nut dye demonstrated least performance potential. These findings offer valuable insights towards optimizing dye to boost the efficiency of DSSC.
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