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All Journal Jurnal Online Mahasiswa (JOM) Bidang Matematika dan Ilmu Pengetahuan Alam Science and Technology Indonesia Journal of Applied Geospatial Information Jurnal Penelitian Pendidikan IPA (JPPIPA) Abdimas Talenta : Jurnal Pengabdian Kepada Masyarakat Hydrogen: Jurnal Kependidikan Kimia Journal of Technomaterial Physics Aceh International Journal of Science and Technology International Journal of Oil Palm
Martha Rianna
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Agriculture, Biological Sciences & Forestry Astronomy Biochemistry, Genetics & Molecular Biology Chemical Engineering, Chemistry & Bioengineering Chemistry Civil Engineering, Building, Construction & Architecture Control & Systems Engineering Decision Sciences, Operations Research & Management Earth & Planetary Sciences Education Electrical & Electronics Engineering Energy Engineering Environmental Science Law, Crime, Criminology & Criminal Justice Materials Science & Nanotechnology Mathematics Physics Social Sciences

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Management of Electric Field under the Sag of High Voltage Overhead Transmission Lines Rianna, Martha
Journal of Technomaterial Physics Vol. 2 No. 1 (2020): Journal of Technomaterial Physics
Publisher : Talenta Publisher

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.32734/jotp.v2i1.5261

Abstract

There have been many methods used to determine the electric field strength under the 150 KV overhead transmission lines (OHTL). Since it is simple and can be used for a homogeneous and multilayer medium, the method chosen for modeling the electric field under the OHTL is the complex image method (CIM). The results obtained show that the electric field strength obtained by the CIM is in agreement with that obtained by Complex Determine Method (CDM). Furthermore, the results obtained from the CIM model fit well with the field data. The OHTL height that must be raised so that the electric field strength under the OHTL will meet the WHO quality standards is 3 m at location A and 2 m at location B. These results show that modelling the electric field under the OHTL using CIM is exellent.
SISTEM PEMANAS AIR ENERGI SURYA MENGGUNAKAN KOLEKTOR PALUNG PARABOLA POSISI TIMUR-BARAT Martha Rianna; Maksi Ginting; Sugianto '
Jurnal Online Mahasiswa (JOM) Bidang Matematika dan Ilmu Pengetahuan Alam Vol 2, No 1 (2015): Wisuda Februari 2015
Publisher : Jurnal Online Mahasiswa (JOM) Bidang Matematika dan Ilmu Pengetahuan Alam

Show Abstract | Download Original | Original Source | Check in Google Scholar

Abstract

Heating System of Solar Energy by using Parabolic Trough Collector of East West Position has been experimentally conducted. The collector is set at open air from the sun radiation and observed every 60 minutes from 9 AM until 3 PM for bright sunshine. After 14 days, the results show that the collector temperature has a minimum average of collector 40,290C and water tank 36,070C at 10 AM, whereas the highest average temperature is 51,260C and water tank 45,570C at 1 PM. The observation describes the highest temperature at collector tank occurs at 1 PM due to the highest radiation intesity to the collector reaching maximum value of 448 W/m2. Loss heat by conduction at lowest rate is 23,50 J/s at 10 AM whereas loss heat by conduction at highest rate 36,60 J/s at 1 PM. The average water volume is 39 liters for 6 hours daily from 9 AM until 3 PM. Overall, the higher radiation intensity from the sun to heat the collector, the higher water temperature observed in the collector tank.
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.
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.
Increasing the Economic Value of Hydrogel as an Alternative Planting Media at Madrasah Aliyah Swasta Muhammadiyah Sidomulyo Hamid, Muhammadin; Simanjuntak, Crystina; Rianna, Martha; Amaturrahim, Suci Aisyah; Saragi, Indah Revita; Felly, Putri Aldika; Siahaan, Chyntia; Waruwu, Delima; Talanda, Aknes; Tambunan, Miranda
ABDIMAS TALENTA: Jurnal Pengabdian Kepada Masyarakat Vol. 9 No. 1 (2024): ABDIMAS TALENTA: Jurnal Pengabdian Kepada Masyarakat
Publisher : Talenta Publisher

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.32734/abdimastalenta.v9i1.16316

Abstract

Hydrogel technology can be used as a solution for indoor growing media. Hydrogel is a three-dimensional polymer network with cross-linked hydrophilic polymers, which are capable of swelling or storing water and physiological solutions up to thousands of times their dry weight, and are not easily soluble. To increase knowledge about ornamental plant cultivation using hydrogel media, a service was carried out by using partners at the Madrasah Aliyah Swasta Muhammadiyah Sidomulyo. This service aims to provide solutions to partners in the form of alternative hydrogel-based planting media made from alginate that are environmentally friendly which can be used as moisture and nutrient control agents. This goal is achieved through outreach activities, training, and the application of alternative planting media on ornamental plants. The target of the results to be achieved is to increase the economic value of hydrogels and to foster the entrepreneurial spirit of the students of Madrasah Aliyah Swasta Muhammadiyah Sidomulyo.
The Renewable Water Filtration Innovation From Palm Oil Mill Effluent Waste Sufina Azzahra; Martha Rianna; Nabila Agustin
International Journal of Oil Palm Vol. 7 No. 3 (2024)
Publisher : Indonesian Oil Palm Society /IOPS (Masyarakat Perkelapa-sawitan Indonesia /MAKSI)

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.35876/ijop.v7i3.124

Abstract

Indonesia is the largest palm oil producing country in the world. According to data from the North Sumatra BPS in 2021, Palm Oil production was 5,311,884 tons. Every palm oil factory disposes of its liquid waste which results in waste pollution becoming a very crucial issue to be addressed immediately because it has many negative impacts. POME is rich in minerals and carbon, but POME waste is currently not fully utilized optimally. The purpose of this research is to produce the latest innovation in water filtration to realize SDGs 2045 on clean water and sanitation and to study the effectiveness of magnetic which will be applied as clean water filtration by utilizing POME waste and natural sand containing ?-Fe2O3, alumina (Al2O3) and magnetic minerals with well water as samples in this study. The combination of POME waste and natural sand with chemical synthesis and calcination methods at a temperature of 500oC as activation of activated carbon and magnetic metals. The results of the synthesis of POME and natural iron sand obtained solids in the form of black powder. In the VSM test, the magnetization versus magnetic field data of Fe3O4/activated carbon POME obtained a magnetic saturation value of 10.13 emu/g. In the XRD test results of activated carbon materials, composites of activated carbon iron oxide and iron oxide and the synthesis results have diffraction patterns similar to the XRD database from JCPDS and in the COD and BOD tests, it proves a decrease in COD and BOD levels in well water before and after filtration with a large range, this indicates the success of the filtration process. In the AAS test as an identification of Fe metal in well water samples, Fe metal becomes <0.00206 (mg/L) starting from 0.01 (mg/L).
Microwave Absorption Analysis of Barium Hexaferite And Iron Sand Naibaho, Yeni P. S.; Humaidi, Syahrul; Rianna, Martha; Diana, Linda E.
Journal of Applied Geospatial Information Vol. 8 No. 1 (2024): Journal of Applied Geospatial Information (JAGI)
Publisher : Politeknik Negeri Batam

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.30871/jagi.v8i1.7732

Abstract

The goal of this study is to investigate the properties of barium hexaferrite and iron sand as microwave absorbers. The focus is on understanding how these materials affect microwave absorption and the specific frequency range of waves they produce. The solid reaction method was used in the study. The study's findings indicate that the combination of iron sand with barium hexaferrite material leads to the formation of a homogeneous material with a single phase. X-ray diffraction pattern data confirms the presence of a single-phase material, specifically iron sand and barium hexaferrite, which consists of hematite and barium hexaferrite. The VNA observations reveal that the iron sand and barium hexapherite materials can absorb electromagnetic waves at a radar wave frequency of 11.1 GHz, resulting in a loss of -23.86 dB. Furthermore, the material demonstrates its ability to absorb microwaves. The absorption of microwaves relies on the quantity of particles in the absorbent substance and its microwave-absorbing capacity. To thoroughly assess the absorption properties of various samples, it is essential to not only evaluate their reflection loss but also analyze how well they operate as microwave absorbers.
Co-Authors Adi Rahwanto Amaturrahim, Suci Aisyah Anggito P. Tetuko, Anggito P. Diana, Linda Diana, Linda E. Eko Arief Setiadi, Eko Arief Elnovreny, Jane Felly, Putri Aldika Fitri Handayani Guk-Guk, Herwati Permata Indah Raja Habib Satria Hakim S, Abd Hamid, Muhammadin Hussain, Muhammad Khalid Indri Dayana Maksi Ginting Nabila Agustin Naibaho, Yeni P. S. Naibaho, Yeni P.S Noverita Sprinse Vinolina Nurwijayanti Perdamean Sebayang Saragi, Indah Revita Siahaan, Chyntia Simanjuntak, Crystina Sitorus, Kurnia Jesiska Sufina Azzahra Sugianto &#039; Syahrul Humaidi, Syahrul Syahwin, Syahwin Talanda, Aknes Tambunan, Miranda Timbangen Sembiring Waruwu, Delima