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All Journal International Journal of Applied Power Engineering (IJAPE) Bulletin of Electrical Engineering and Informatics Elkawnie Science and Technology Indonesia Journal of Applied Geospatial Information Jurnal Penelitian Sains Abdimas Talenta : Jurnal Pengabdian Kepada Masyarakat Indonesian Journal of Chemistry Eksakta : Berkala Ilmiah Bidang MIPA Hydrogen: Jurnal Kependidikan Kimia Journal of Technomaterial Physics International Journal of Social Service and Research Multidiciplinary Output Research for Actual and International Issue (Morfai Journal) International Journal of Research in Vocational Studies (IJRVOCAS) PROSIDING SEMINAR NASIONAL FISIKA (E-JOURNAL) Prisma Sains: Jurnal Pengkajian Ilmu dan Pembelajaran Matematika dan IPA IKIP Mataram Jurnal Rekayasa Energi Kesatria : Jurnal Penerapan Sistem Informasi (Komputer dan Manajemen)
Syahrul Humaidi, Syahrul
Department Of Physics, Faculty Of Mathematics And Natural Sciences – Universitas Sumatera Utara, Jl. Dr. T. Mansur No.9, Padang Bulan, Kec. Medan Baru, Kota Medan, Sumatera Utara
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1-Dimensional Model of Seismic Velocity after Tarutung Earthquake 1 October 2022 Mw 5.8 Resa Idha; Endah P. Sari; Yusran Asnawi; Andrean V.H Simanjuntak; Syahrul Humaidi; Umar Muksin
Journal of Applied Geospatial Information Vol 7 No 1 (2023): Journal of Applied Geospatial Information (JAGI)
Publisher : Politeknik Negeri Batam

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.30871/jagi.v7i1.5662

Abstract

On October 1, 2022, an earthquake with a magnitude (M) of 5.8 occurred in the Tarutung region, Indonesia and was associated with an active fault at a depth of 10 km. The earthquake fault with dextral mechanism is suitable with the pattern of active fault movement in Sumatra in the Northeast - Southwest direction. A total of 170 aftershocks occurred within a week span with magnitude variations of 1.7 – 4.0. In addition, the Tarutung earthquake was felt by the local peoples with an intensity of IV - VI MMI and caused 1 fatality, 25 injuries, and around 900 houses were damaged. Therefore, this study studies the characteristics of seismicity and damage caused by finding an appropriate 1-Dimensional seismic velocity model. The obtained 1-Dimensional speed model has varying values at a depth of 10 km with a speed of ~5.5 km/s and 30 km with a speed of ~7 km/s. The 1-D velocity model obtained has a convergent and unique solution with an RMS value < 1.0. Based on ground motion analysis after relocation, it was found that the high PGA and PGV values were in Tarutung. The PGA results reveal a high percentage value of >10% in Tarutung. This is consistent with the damage data and at the same time confirms that Tarutung is in a seismically active area.
Faulting Mechanism of Tarutung Earthquake 2022 Mw 5.8 Using Moment Tensor Inversion Endah P. Sari; Resa Idha; Yusran Asnawi; Andrean Simanjuntak; Syahrul Humaidi; Umar Muksin
Journal of Applied Geospatial Information Vol 7 No 1 (2023): Journal of Applied Geospatial Information (JAGI)
Publisher : Politeknik Negeri Batam

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.30871/jagi.v7i1.5663

Abstract

On October 1, 2022, an earthquake with a magnitude of 5.8 shook the Tarutung area which was generated by an active fault at a shallow depth of 10 km. In this study, relocating the hypocenter and determining the mechanism of the earthquake was carried out to understand the active tectonic structure. The distribution of hypocenter relocation figures a pull-apart pattern at shallow depths. The earthquake mechanism shows a dextral pattern in the Southwest – Southeast direction with a strike of 138º – 158º. The aftershocks are more dominantly distributed in the pull-apart system in the southeastern part and show the greater part of the transfer of seismic static stress to the southeastern side of the Toru fault. The pull-apart tectonic system scheme in the Tarutung basin with secondary faults as extensional faults is proposed to be a fault source model that forms a negative-flower structure geological pattern. The results of this study can be used as a reference for the Tarutung tectonic system and applied as a mitigation study.
Synthesis and Electrochemical Characterization of Sodium-Ion Battery Anode Carbon Biomassa Based on Sunflower Seed Husk (Helianthus annuus) Simanjuntak, Renaldo; Dinda Amilia; Syahrul Humaidi; Achmad Subhan
Journal of Technomaterial Physics Vol. 5 No. 2 (2023): Journal of Technomaterial Physics
Publisher : Talenta Publisher

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.32734/jotp.v5i2.12394

Abstract

This study aimed to synthesize materials from the carbon biomass of sunflower seed husk (Helianthus Annuus) for sodium ion battery anode. A simple carbonization process was carried out by roasting. The chemical activation process was conducted by adding KOH as much as 4M in 100 mL water solution for 20 hours. Then drying was done in the oven at a temperature of 100ºC for 20 hours, and then continued with the sintering process at a temperature of 900ºC for 2 hours. The sintered results were washed and hydrothermal for 20 hours at 200ºC with 4 mL H2O2 and 1 mL EG in 50 mL Teflon. The resulting acid degree was neutralized (pH ~ 7) with distilled water and then dried at 100ºC for 20 hours. The hydrothermal powder was pulverized using a mortar and pestle and then sieved on a 325 mesh sieve. Anode sheets were prepared by mixing active ingredients: PVDF: Super-P with a composition of 85: 10: 5 by adding 2 ml of DMAC solvent. Electrochemical characterization testing was carried out to see the resulting performance—the results obtained from EIS, CV, and CD show that commercial hard carbon is better.
Study and Characterization of Tribofilm based on Activated Carbon-Nanochitosan Modified with Silicone Oil for Application of Self-Healing Coatings on Metal Surfaces Sarah Mutiara Sembiring; Syahrul Humaidi; Martha Riana
Prisma Sains : Jurnal Pengkajian Ilmu dan Pembelajaran Matematika dan IPA IKIP Mataram Vol 11, No 4: October 2023
Publisher : IKIP Mataram

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.33394/j-ps.v11i4.8862

Abstract

A tribofilm material based on activated carbon and nanochitosan modified with silicone oil has been prepared using the sol gel method with variations in the composition of activated carbon at a mass ratio of 40% wt – 60% wt at 5% wt intervals. Sampling was carried out in two stages. The first stage of the synthesis of activated carbon from palm shells using activation of 7% H3PO4 and nanochitosan derived from shrimp shells using the ionic gelation method. The second stage was mixing the tribofilm material of activated carbon, nanochitosan and silicone oil using the sol gel method to produce a film-forming solution which was then characterized including: physical, chemical, mechanical and thermal properties. The characterization results showed that the most optimum composition was the tribofilm material of activated carbon/nanochitosan/silicone oil in S1 with a mass ratio of 40%wt activated carbon which produced a density of 0.94 x 103 kg/m3, a viscosity of 28.42 cP, and a liquid surface tension of 63.5 mN/m. While the performance characteristics of the metal surface coating produce a surface roughness of 0.162 µm for aluminum metal and 0.156 µm for copper metal, friction coefficient 0.024, wear rate 0.19 mm, thermal conductivity 0.092 W/m.K, corrosion properties 1a (slight tarnish), rate corrosion rate of 2.34 mm/yr in 3.5% NaCl medium, 4.33 mm/yr in seawater medium and 11,476 mm/yr in 3% H2SO4 medium and has good self-healing properties for 3 days on carbon steel metal surfaces with corrosion scratch treatment on 3.5% NaCl media, namely almost all the scratches/cracks covered due to frictional force from galvanic corrosion with active carboxyl, amine and hydroxyl groups with the healing agent aminopropyl siloxane (NH2-R-NH-Si-O-R) which reacts with metal ion particles (M-OH) in the formation of polymer chains for new network layers.
Model Kecepatan Seismik 1-Dimensi Pada Wilayah Gempa Bumi Tarutung 2022 Mw 5.8 Resa Idha; Endah P. Sari; Syahrul Humaidi; Andrean V. H Simanjuntak; Umar Muksin
Kesatria : Jurnal Penerapan Sistem Informasi (Komputer dan Manajemen) Vol 4, No 2 (2023): Edisi April
Publisher : LPPM STIKOM Tunas Bangsa

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.30645/kesatria.v4i2.183

Abstract

On October 1, 2022, an earthquake with a magnitude (M) of 5.8 occurred in the Tarutung region, Indonesia, and was associated with an active fault at a depth of 10 km. The earthquake fault with a dextral mechanism is suitable for the pattern of active fault movement in Sumatra in the Northeast - Southwest direction. A total of 170 aftershocks occurred within a week span with magnitude variations of 1.7 – 4.0. In addition, the Tarutung earthquake was felt by the local people with an intensity of IV-VI MMI and caused 1 fatality, 25 injuries, and around 900 houses damaged. Therefore, this study studies the characteristics of seismicity and damage caused by finding an appropriate 1-Dimensional seismic velocity model. The obtained 1-Dimensional speed model has varying values at a depth of 10 km with a speed of ~5.5 km/s and 30 km with a speed of ~7 km/s. The 1-D velocity model obtained has a convergent and unique solution with an RMS value 1.0. Based on ground motion analysis after relocation, it was found that the high PGA and PGV values were in Tarutung. The PGA results reveal a high percentage value of 10% in Tarutung. This is consistent with the damage data and at the same time confirms that Tarutung is in a seismically active area.
Model Mekanisme Patahan Gempa Bumi Tarutung 2022 Mw 5.8 Endah P. Sari; Resa Idha; Hendro Nugroho; Syahrul Humaidi; Andrean V. H Simanjuntak; Umar Muksin
Kesatria : Jurnal Penerapan Sistem Informasi (Komputer dan Manajemen) Vol 4, No 2 (2023): Edisi April
Publisher : LPPM STIKOM Tunas Bangsa

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.30645/kesatria.v4i2.184

Abstract

On October 1, 2022, an earthquake with a magnitude of 5.8 shook the Tarutung area which was generated by an active fault at a shallow depth of 10 km. In this study, relocating the hypocenter and determining the mechanism of the earthquake was carried out to understand the active tectonic structure. The distribution of hypocenter relocation figures a pull-apart pattern at shallow depths. The earthquake mechanism shows a dextral pattern in the Southwest – Southeast direction with a strike of 138º – 158º. The aftershocks are more dominantly distributed in the pull-apart system in the southeastern part and show the greater part of the transfer of seismic static stress to the southeastern side of the Toru fault. The pull-apart tectonic system scheme in the Tarutung basin with secondary faults as extensional faults is proposed to be a fault source model that forms a negative-flower structure geological pattern. The results of this study can be used as a reference for studying the Tarutung tectonic system and applied as a mitigation study.
Characteristics of Cloud to Ground (CG) Lightning and Heavy Rainfall in Medan and Deli Serdang Patra Mesiari Tarigan; Syahrul Humaidi; Yahya Darmawan; Marhaposan Situmorang; Martha Rianna
Prisma Sains : Jurnal Pengkajian Ilmu dan Pembelajaran Matematika dan IPA IKIP Mataram Vol 11, No 4: October 2023
Publisher : IKIP Mataram

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.33394/j-ps.v11i4.10295

Abstract

The areas of Medan and Deli Serdang have complex topography, stretching from the slopes of Bukit Barisan Mountains to the east coast of North Sumatera. This condition causes Medan and Deli Serdang areas frequently form convective clouds that produce rain and lightning. This research utilizes Cloud to Ground (CG) lightning data and rainfall from 2019-2022 to analyse the characteristics and relationship between lightning and rainfall in Medan and Deli Serdang. CG lightning data is obtained from Lightning Detector equipment with a 10 km radius to avoid noise and obtain better data. Rainfall data above 50 mm/day (heavy rain) is used, which is obtained from 3 rain gauges locations. The study results showed that there was an increase in lightning events along with an increase of rainfall which showed almost the same pattern of peak activity from lightning and rainfall. The correlation between heavy rainfall and CG lightning, in the Medan and Deli Serdang areas are moderate positive, around r=0.566 for CG-, r=0.567 for CG+ and r= 0.576 for total CG. The highest correlation in Sunggal Rain Station is r = 0.947, in Deli Serdang Climatological Station is r = 0.950 and in the Kualanamu Meteorological Station is r = 0.932.
Palm Oil Fuel Ash and Fly Ash for a Partial Replacement of Cement in High-Quality, Environmentally Friendly Mortar as a Solution to Industrial Waste Siregar, Shinta Marito; Humaidi, Syahrul; Bukit, Nurdin; Frida, Erna
Science and Technology Indonesia Vol. 9 No. 1 (2024): January
Publisher : Research Center of Inorganic Materials and Coordination Complexes, FMIPA Universitas Sriwijaya

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.26554/sti.2024.9.1.59-68

Abstract

This study explores the effects of incorporating palm oil fuel ash (POFA) and fly ash (FA) as partial cement substitutes on the mechanical properties and characteristics of high-quality mortar, specifically Engineered Cementitious Composites (ECC). ECC mortar was fabricated by milling POFA waste and FA through a top-down method utilizing a ball mill. The resulting material was subjected to tests for slump flow, water absorption, compressive strength, and characterized through XRF, FTIR, SEM/EDX, and XRD analyses. FTIR analysis verified the existence of Si-O and Al-O groups within the composite made of POFA-FA ECC. XRF analysis of FA and POFA showed cementitious properties, with SiO2+Al2O3+Fe2O3 exceeding 50% and CaO surpassing 10%. SEM and XRD results indicated minimal cavity formation, suggesting a high compressive strength in the mortar. Particle size distribution analysis revealed prevalent particles in the 1.5×10−1 to 2.0×10−1 μm range. The compressive strength test after 28 days, incorporating 15% FA and 10% POFA, yielded the highest strength at 59.30 MPa. The water absorption values ranged from 1.25% to 2.67%, indicating that POFA-FA assists in the cement hydration process and also serves as a filler. As a result, the material’s density is very high, leading to fewer voids formed, thus reducing the trapped water, which significantly affects the mortar’s strength.
Electromigration Effects in Overcurrent PVC-Insulated Copper Wire: Failure and Deformation Impacts Akbar, Muhammad Ali; Tarigan, Kerista; Humaidi, Syahrul; Ramdan, Dadan; Siregar, Yulianta
Science and Technology Indonesia Vol. 9 No. 3 (2024): July
Publisher : Research Center of Inorganic Materials and Coordination Complexes, FMIPA Universitas Sriwijaya

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.26554/sti.2024.9.3.735-744

Abstract

Electromigration is a critical issue in materials science and electrical engineering, significantly impacting the reliability and efficiency of electrical systems. This study investigates the electromigration behavior of PVC-insulated copper wires under various overcurrent conditions, focusing on material degradation and electrical performance. Copper cables, identified as 046620.3 Eterna CU/PVC 1.5 mm2, were subjected to currents ranging from 0 to 110 A. The mean time to failure (MTTF) was calculated using Black’s equation, revealing a sharp decline in MTTF with increasing current density. Surface morphology analysis using SEM showed the formation of voids and hillocks at higher currents, indicating severe electromigration damage. XRF analysis demonstrated significant changes in the elemental composition, particularly a reduction in copper content and an increase in chlorine and other elements, suggesting degradation of the PVC insulation. FTIR spectroscopy revealed substantial chemical changes in the PVC material, especially under extreme overcurrent conditions, highlighting dehydrochlorination and carbonyl group formation. There is a clear relationship between overcurrent conditions and electromigration phenomena, as evidenced by the observed damage to surface morphology, changes in elemental composition, and alterations in the chemical structure of PVC. The mechanisms and causes of electromigration are explained comprehensively in this work, illustrating how increased overcurrent accelerates the electromigration process, leading to the formation of voids and hillocks in the copper conductor. This damage is accompanied by a significant reduction in copper content and an increase in chlorine levels, indicating the degradation of PVC insulation. FTIR spectra further confirmed these findings by showing chemical changes such as dehydrochlorination and carbonyl group formation under high current stress. The MTTF values reflect the severity of these impacts, with samples exposed to higher currents showing drastically reduced lifespans. For instance, samples subjected to 100 A and 110 A currents exhibited MTTF values of 0.2 minutes and 0.004 minutes, respectively.
Design and Development of A Digital Soil Temperature Monitoring System Based on The Internet of Things at North Sumatra Climatological Station Manurung, Royston; Nasution, Tulus Ikhsan; Humaidi, Syahrul; Saragih, Immanuel Jhonson A.; Hibatullah, Khindi Aufa; Situmorang, Marhaposan; Darmawan, Yahya
Journal of Applied Geospatial Information Vol 7 No 2 (2023): Journal of Applied Geospatial Information (JAGI)
Publisher : Politeknik Negeri Batam

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.30871/jagi.v7i2.6545

Abstract

Soil temperature is a crucial parameter in monitoring and understanding climate and soil ecosystems. It plays a vital role in various environmental aspects, including agriculture, ecology, and geoscience. Monitoring soil temperature is necessary for planning and managing agriculture and natural resources. Currently, temporal observations of soil temperature by BMKG are limited, conducted only at 07:55, 13:55, and 18:55 local time. This limitation makes it difficult to perform detailed soil temperature analysis. This research was conducted to design a digital soil temperature monitoring device accessible via the internet. Seven DS18B20 sensors were used at depths of 0 cm, 2 cm, 5 cm, 10 cm, 20 cm, 50 cm, and 100 cm, combined with an ESP8266 module using the Arduino system. The implementation of this design resulted in a real-time soil temperature monitoring system with data updates every 10 seconds. The observed data are displayed on a 20x4 LCD and sent to the cloud, making them accessible on the webpage http://monitoringsuhutanah.my.id. Calibration results indicate that the DS18B20 sensors used in this study provide accurate and consistent temperature measurements, with an average correction range of (-0.20) to 0.24, thus suitable for operational use. Field tests show that the digital data are accurate and correspond (linearly correlate) with conventional data. This is based on a correlation value of 0.7, while the RMSE values range from 0.5 to 2.18 and the bias ranges from (-0.69) to 0.08.
Co-Authors Abdulmajid, Muhammad W. Achmad Subhan Achmad Subhan Aditia Warman Agitta Rianaris Agung Imaduddin, Agung Aldira, Syarah Alfonsius Chrisandy Pratama Siregar Aliakbar, Muhammad Alya Nazwariva Andrean Simanjuntak Andrean V. H Simanjuntak Andrean V.H Simanjuntak Armelia Yuniani Averroes Fazlur Rahman Piliang Bonardo, Doli Dadan Ramdan Delviya Amisha Diana Alemin Barus Diana, Linda Diana, Linda E. Dinda Amilia Duma, Tulus Na Dwi Hanto Endah P. Sari Endah P. Sari Endah P. Sari Endah Paramita Erna Frida Ervina Putri Wulandari Estananto Fathi Marzuqi Fynnisa Zebua G. Gunawan Hari Pratomo Helena Artasari Sihombing Hendro Nugroho Heri Nugraha Herri Trisna Frianto, Herri Trisna Hibatullah, Khindi Aufa Humam Maulana Imaddudin, Agung Jihan Murtadha Rambe Kerista Sebayang Lestari Irene Purba Liza, Erliza Pratiwi Manurung, Ellya Veronika Iriani Manurung, Royston Mardiningsi Mardiningsi Marhaposan Situmorang Marhaposan Situmorang Marhaposan Situmorang Marhaposan Situmorang Marhaposan Situmorang, Marhaposan Martha Riana Martha Riana Martha Rianna Marzuki Sinambela Marzuki Sinambela Marzuki Sinambela Masherlina Masno Ginting Maulid, Nurul Mega Sirait Miftahul Fiqri Moraidah Hasanah Muhammad Abduh Akram Agus Muhammad Ali Akbar, Muhammad Ali Muhammad Wildan Abdulmajid Muhammadin Hamid Muliyati Muliyati Naibaho, Marzuki Naibaho, Yeni P. S. Naibaho, Yeni P.S Nazwa Armi Nofriha Rahmayani Siregar Nono Darsono, Nono Noor Haida Mohd Kaus Nurdin Bukit Nursal Nurul Maulida R Nasution Patra Mesiari Tarigan Perdinan Sinuhaji Perdinan Sinuhaji Perdinand Sinuhaji Rahmadsyah Rahmadsyah Ramlan, H. Rangkuti, Yusridah Resa Idha Resa Idha Resa Idha Rifai, Abdulloh Rizki Fadhillah Pratama Putra Romeo Kondouw Russell Ong Saharman Gea Sally Irvina Ritonga Santoso, Bayu Santy Meilisa Manurung Saragih, Dearninta A. P. Saragih, Immanuel Jhonson A. Sarah Mutiara Sembiring Satrio Herbirowo, Satrio Shiamny Nur Khair Tarigan Sihotang, Bertalina Simanjuntak, Andrean V. H. simanjuntak, benrad edwin Simanjuntak, Renaldo Siregar, Shinta Marito Suharlan, Didy Sulaiman, Muhammad Thariq As Surip Kartolo Susilawati Susilawati Susilawati Tarigan, Kerista Theresia Grefyolin Simbolon Timbangen Sembiring Titik Lestariningsih, Titik Tua Raja Simbolon Tulus Ikhsan Nasution Umar Muksin Umar Muksin Utami Ahda Surya Waslina Rangkuti Widya Nazri Afrida Yahya Darmawan Yahya Darmawan Yahya Darmawan Yahya Darmawan Yahya Darmawan Yahya Darmawan Yahya Darmawan Yahya Darmawan Yulianta Siregar Yusran Asnawi Zahedi Zahedi Zahwan Asrof Zahirul Ubaid Zikri Noer Zuriah Sitorus