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All Journal Jurnal Penelitian Fisika dan Aplikasinya (JPFA) Jurnal Online Mahasiswa (JOM) Bidang Matematika dan Ilmu Pengetahuan Alam Journal of Aceh Physics Society JURNAL PENGABDIAN KEPADA MASYARAKAT Science and Technology Indonesia Journal of Applied Geospatial Information Jurnal Penelitian Pendidikan IPA (JPPIPA) INDONESIAN JOURNAL OF APPLIED PHYSICS Abdimas Talenta : Jurnal Pengabdian Kepada Masyarakat Journal of Applied Engineering and Technological Science (JAETS) Hydrogen: Jurnal Kependidikan Kimia Journal of Sustainable Community Development (JSCD) Journal of Technomaterial Physics Prisma Sains: Jurnal Pengkajian Ilmu dan Pembelajaran Matematika dan IPA IKIP Mataram Jurnal Natural Aceh International Journal of Science and Technology International Journal of Oil Palm
Martha Rianna
Departemen Fisika, Universitas Sumatera Utara, 20155 Medan, Indonesia
Agriculture, Biological Sciences & Forestry Arts Humanities Astronomy 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 Earth & Planetary Sciences Economics, Econometrics & Finance Education Electrical & Electronics Engineering Energy Engineering Environmental Science Immunology & microbiology Industrial & Manufacturing Engineering Languange, Linguistic, Communication & Media Law, Crime, Criminology & Criminal Justice Materials Science & Nanotechnology Mathematics Neuroscience Physics Social Sciences Other

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Effect of NaOH Concentration on Magnetic Properties and Structural Studies of MgFe2O4 Based on Natural Iron Sand Synthesized by Co-Precipitation Method Shiamny Nur Khair Tarigan; Syahrul Humaidi; Martha Rianna; Nurul Maulida R Nasution
Prisma Sains : Jurnal Pengkajian Ilmu dan Pembelajaran Matematika dan IPA IKIP Mataram Vol 11, No 2: April 2023
Publisher : IKIP Mataram

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.33394/j-ps.v11i2.8092

Abstract

This research was conducted to synthesize MgFe2O4 using the coprecipitation method by varying the concentration of NaOH. In this study, MgCl26H2O, iron sand, 37% HCl and variations of NaOH (5 M and 10 M) were mixed at 90 ℃ for 60 minutes, then washed using distilled water and ethanol until pH = 7, and calcined at 750 ℃. The test results using X-Ray Diffraction (XRD) showed that the diffraction pattern of phase formation identified was MgFe2O4 with hkl values (220), (311), (400), (422), (511), and (440). The resulting crystal size decreased with the addition of NaOH concentration. The test results using a Vibrating Sample Magnetometer (VSM) show that the magnetization value decreases when the crystal size decreases.
COMPARISON OF ENERGY DOSES 10 MV DISTRIBUTION USING PERCENTAGE DEPTH DOSE (PDD) METHOD ON LINAC: ELECTA AND SIEMENS Martha Rianna; Herty Afrina Sianturi; Hariyati Lubis; Awan Pelawi; Timbangen Sembiring; Marhaposan Situmorang
Jurnal Natural Volume 18, Number 2, June 2018
Publisher : Universitas Syiah Kuala

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.24815/jn.v18i2.11133

Abstract

The patient dosing on Linac (Electa and Siemens) can be determined by Source Surface Distance (SSD) technique using Precentage Depth Doses (PDD) method. The study was conducted by measuring PDD to compare the dosage distribution calculations on Linac Electa and Siemens device of photon energy at 10 MV. PDD is done with a 100 cm SSD technique at a depth of 0 to 25 cm. The dose distribution results between the Electrical and the Siemens PDD are almost the same in that the Dmax at 10 MV Siemens photon energy occurs at a depth of 20 mm while the 10 MV Electa photon energy occurs at a depth of 21 mm. Both Linac Electa and Siemens device this at the same energy of 10 MV there is a difference of 95.23%.Keywords: Distrubusi dose, PDD, Photon Energy, Quality File Index
CHARACTERIZATION OF NATURAL IRON SAND FROM KATA BEACH, WEST SUMATRA WITH HIGH ENERGY MILLING (HEM) Martha Rianna; Timbangen Sembiring; Marhaposan Situmorang; Candra Kurniawan; Eko Arief Setiadi; Anggito P Tetuko; Silviana Simbolon; Masno Ginting; Perdamean Sebayang
Jurnal Natural Volume 18, Number 2, June 2018
Publisher : Universitas Syiah Kuala

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.24815/jn.v18i2.11163

Abstract

Iron sand is one of the natural resources in West Sumatra that has not been optimally utilized. One of the potential locations to get this iron sand deposits is the coast of Kata. This study aims to analyze the content and size of the iron grains found on the coast of Kata Padang Beach, West Sumatera Province. Coastal sand samples are extracted using permanent magnets to separate magnetic and non-magnetic materials. Characterization of iron sand using Scanning Electron Microscopy with Energy Dispersive X-ray (SEM-EDX) and Vibrating Sample Magnetometer (VSM). The result of characterization using SEM-EDX shows that iron sand samples contain Fe and O elements derived from Phase Magnetite (Fe3O4).  Keywords: iron sand, magnetic materials, SEM-EDX, VSM
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.
Study and Characterization of Fe3O4-PEG Nanoparticles Using The Co-Precipitation Method For The Production of Permanent Magnets HANDAYANI, FITRI; Rianna, Martha
Journal of Technomaterial Physics Vol. 5 No. 1 (2023): Journal of Technomaterial Physics
Publisher : Talenta Publisher

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.32734/jotp.v5i1.9889

Abstract

Natural iron sand is one of the natural resources in Indonesia, especially in the Cianjur area, West Java which has been used optimally. This study aims to analyze Fe's content, properties, and grain size found in Cianjur, West Java. The natural iron sand samples were prepared using the calcination method, which was dried at 50°C until the samples became powder. Beach sand samples are extracted using a permanent magnet to separate magnetic and non-magnetic materials. Characterization of iron sand using XRD, SEM, VSM, and FTIR. The XRD results show that the natural iron sand sample has a single magnetite phase (Fe3O4). A spinel cubic crystal structure is formed with lattice parameters of 8,513 Ǻ using Co-Precipitation. SEM results show that the sample is inhomogeneous or homogeneous, as indicated by the gap and agglomeration of particles in each sample. VSM results show that the parameter magnetic properties saturation (Ms) on average is 23.9763735 emu/g, magnetic remanence (Mr) is on average 5.14865198 emu/g, and coercivity is on average 125.139457033 emu/g. Where in sample 1, saturation is 29.7729509 emu/g, remanance is 4.0486018 emu/g, coercivity is 92.1368641 emu/g, sample 2 is saturation 21.5994425 emu/g, remanance 8.18772602 emu/g, coercivity 179.567079 emu/g and sample 3 has a saturation value of 20.55672771 emu/g, remanance 3.20962812 emu/g. Then, the FTIR results showed a shift in the vibration peak, which experienced a change in the vibrational energy of Fe-O and then showed the -OH group at an absorption of 3400/cm. The results of this study have the potential to process other magnetic materials.
Characterization of Barium Hexaferrite and Iron Sand as Microwave Absorbing Materials Naibaho, Yeni P.S; Humaidi, Syahrul; Rianna, Martha; Diana, Linda
Hydrogen: Jurnal Kependidikan Kimia Vol 12, No 2 (2024): April-May 2024
Publisher : Universitas Pendidikan Mandalika

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.33394/hjkk.v12i2.11776

Abstract

This research aims to analyze the characteristics of Barium Hexaferite and iron sand as microwave absorbing materials, their influence on microwave absorption properties, and the frequency range of waves produced by these materials. The research method used is the Co-Precipitation method. Dissolve barium hexapherite and iron sand in distilled water with the appropriate mass ratio. The results of this study show that the synthesis of iron sand and barium hexapherite material produces a single phase material. The single phase material is shown through X-ray diffraction pattern data, namely iron sand and barium hexapherite, namely hematite and barium hexapherite. Iron sand and barium hexapherite materials are characterized using EDS which shows a composition that is close to stoichiometry. Observations using VNA show that iron sand and barium hexapherite materials are able to absorb electromagnetic waves at a radar wave frequency of 11.1 GHz, which is -25.64 dB.
Simple Technology of Material Physics of Groundwater Conservation in Dealing with Climate Change in Disaster Areas of North Sumatera Dayana*, Indri; Satria, Habib; Fauzi, Muhammad; Rahwanto, Adi; Rianna, Martha
Aceh International Journal of Science and Technology Vol 12, No 2 (2023): August 2023
Publisher : Graduate School of Universitas Syiah Kuala

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.13170/aijst.12.2.33058

Abstract

Water is a natural resource with a very important function for human life and advancing general welfare, so water is the basic capital and the main development factor. After the eruption in the Mount Sinabung area, the supply of healthy water was inadequate both in quantity and quality, even though the Karo Regency government made efforts to provide this healthy water. For this reason, appropriate technology is needed in post-eruption water treatment in Mount Sinabung to become healthy water and be used by the local community. This research aims to provide information about Groundwater Conservation Technology in Facing Climate Change in the Disaster Areas of North Sumatra. The method used is quantitative with a purposive sampling technique by selecting 6 wells from 348 wells around Mount Sinabung. Chemical parameters for sampling each - each 1 liter of water to be put in bottles previously cleaned and rinsed with distilled water first, then dried. Laboratory Tests then examined them. There is a simple technology in the form of a water filter made from a mixture of sand, activated carbon, and dried starfruit leaves, which can neutralize contamination of substances such as sulfur and others in the water to obtain healthy water suitable for people in the disaster area.
Micro-Magnetic Activity of the Fabricated MnFe2O4 via Co-Precipitation from Natural Iron Sand Rianna, Martha; Hussain, Muhammad Khalid; Sembiring, Timbangen; Guk-Guk, Herwati Permata Indah Raja; Sitorus, Kurnia Jesiska; Setiadi, Eko Arief; Tetuko, Anggito P.; Sebayang, Perdamean
Science and Technology Indonesia Vol. 10 No. 1 (2025): 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.2025.10.1.221-227

Abstract

This study explores the micromagnetic behaviour of MnFe2O4 derived from natural iron sand through the coprecipitation method, without the need for calcination. Using manganese chlo-ride and iron sand as precursors, one can create MnFe2O4. Through the utilisation of X-ray Diffraction (XRD), Scanning Electron Microscope-Energy Dispersive X-Ray (SEM-EDX), and Vibrating Sample Magnetometer (VSM), one can effectively analyse and understand the crystal structure, morphology, and magnetic properties. The crystal size was reduced by a fac-tor of 0.40 nm, as revealed by XRD crystal structure analysis. Additionally, the XRD results indicated the absence of impurities, confirming the presence of a single phase. In addition, the SEM analysis revealed that samples 1, 2, and 3 underwent agglomeration. The particles have a cubic shape. The analysis using EDX indicates that there are no other elements present in the Mn, Fe, and O. Additionally, the VSM analysis confirms that the sample exhibits magnetic hardness. Sample 1 exhibits exceptional magnetic properties, with Ms values of 217.53 emu/g, Mr 34.27 emu/g, and Hc 127.42 emu/g. Photoluminescence (PL) spectroscopy was used to observe the optical properties of MnFe2O4. Sample 1 exhibits a distinct emission spectrum at 440 nm, representing the purple band. Sample 2 displays a sharp emission spectrum at 448 nm, indicating the blue band. Lastly, Sample 3 demonstrates a clear emission spectrum at 427 nm, signifying the purple band.
Development of Potato Nano Carbon as Electrode for Supercapacitors Achieves Green-Sustainable Development Goals Indri Dayana; Dadan Ramdan; Moranain Mungkin; Habib Satria; Muhammad Fadlan Siregar; Martha Rianna; Juliaster Marbun; Siti Utari Rahayu
Journal of Applied Engineering and Technological Science (JAETS) Vol. 6 No. 1 (2024): Journal of Applied Engineering and Technological Science (JAETS)
Publisher : Yayasan Riset dan Pengembangan Intelektual (YRPI)

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.37385/jaets.v6i1.5862

Abstract

The development of potato nanocarbon as an electrode from potatoes for supercapacitors will answer the energy needs that are needed and are continuously researched. This research was conducted in the laboratory by giving marinade treatment to potatoes and measured repeatedly and testing was carried out to determine the extent of the carbon content so that potatoes are very good to be used as electrodes with electroplating method. The results obtained were 0.8 grams of potatoes with a very high conductivity increase to 0.97 m S. The result TEM 160 nm after treatment an average size of 100 nm successfully coated on the surface of the particles. FTIR shows a wavelength of 3282.48 cm due to the width of potato absorption and overlapping with the C-H-O group. AAS shows the adsorption capacity of modified potato on metals occurs in the pH range 4.5-5.5. Analysis of potatoes to be made as electrodes with two positive and negative pieces showed better dispersion stability. The electrodes are made and have been tested using a smartphone. The acid in the potato forms a chemical reaction with zinc and copper and when electrons flow from one material to another energy is released.
Water Conservation and Sanitation HKBP Sidorame Private SMA Vinolina, Noverita Sprinse; Rianna, Martha
ABDIMAS TALENTA: Jurnal Pengabdian Kepada Masyarakat Vol. 7 No. 1 (2022): ABDIMAS TALENTA: Jurnal Pengabdian Kepada Masyarakat
Publisher : Talenta Publisher

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (1368.395 KB) | DOI: 10.32734/abdimastalenta.v7i1.6925

Abstract

This program is conducted to provide solutions to water conservation and sanitation problems that occur in HKBP Sidorame Private High School. The problem faced by the school is the slow absorption of water around the school yard so that floods often occur when it rains which causes disruption of the teaching and learning process. The service team conducted a site survey, provided socialization and motivation for students regarding the importance of a clean environment. The methods used are repairing damaged waterways and removing waste waste, making bioporous holes at a number of points in the school yard, dismantling and reassembling paving blocks where there were previously closed soil pores, planting plants to accelerate water absorption, renovation of water inlet routes. by increasing the height of the floor which is often the access for water to enter. The results obtained at this time, the school environment is free from puddles when it rains, the waste flow runs smoothly and the school environment is more beautiful. The actions that have been taken are very effective in overcoming the existing sanitation problems and motivate students to care about school hygiene and maintain it on an ongoing basis.
Co-Authors Achmad Maulana Soehada Sebayang Adhi Wibowo Adi Rahwanto Agoez Loeqman Alya Nazwariva Amaturrahim, Suci Aisyah Anggito P Tetuko Anggito P Tetuko Anggito P. Tetuko Anggito P. Tetuko, Anggito P. Awan Pelawi Candra Kurniawan Dadan Ramdan David Arianto Hutajulu Diana, Linda Diana, Linda E. Eko Arief Setiadi Eko Arief Setiadi Eko Arief Setiadi Eko Arief Setiadi, Eko Arief Ervina Putri Wulandari Felly, Putri Aldika Fitri Handayani Fitri Handayani Goldbert Harmuda Duva Sinaga Guk-Guk, Herwati Permata Indah Raja Habib Satria Habib Satria Habib Satria Hakim S, Abd Hamid, Muhammadin Hariyati Lubis, Hariyati Hussain, Muhammad Khalid Indri Dayana Jane Elnovreny Jihan Murtadha Rambe Juliaster Marbun Junedi Ginting Maksi Ginting Marhaposan Situmorang Marhaposan Situmorang Marhaposan Situmorang Marhaposan Situmorang Marhaposan Situmorang Masno Ginting Masno Ginting Mester Sitepu Moranain Mungkin Muhammad Abduh Akram Agus Muhammad Fadlan Siregar Muhammadin Hamid Muhammadin Hamid Nabila Agustin Naibaho, Yeni P. S. Naibaho, Yeni P.S Noverita Sprinse Vinolina Nurul Maulida R Nasution Nurwijayanti Patra Mesiari Tarigan Perdamean Sebayang Perdamean Sebayang Perdamean Sebayang Perdamean Sebayang Putri Cahaya Situmorang Saragi, Indah Revita Shiamny Nur Khair Tarigan Siahaan, Chyntia Siahaan, Doni Aldo Sianturi, Herty Afrina Silviana Simbolon Simanjuntak, Crystina Siti Utari Rahayu Sitorus, Kurnia Jesiska Sufina Azzahra Sugianto ' Syahrul Humaidi, Syahrul Syahwin, Syahwin Talanda, Aknes Tambunan, Miranda Timbangan Sembiring Timbangen Sembiring Tua Raja Simbolon Waruwu, Delima Wina Rahmadani Rangkuti Yahya Darmawan Yoga Pratama Zikri Noer Zikri Noer