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All Journal Journal of Aceh Physics Society Gravity : Jurnal Ilmiah Penelitian dan Pembelajaran Fisika Abdimas Talenta : Jurnal Pengabdian Kepada Masyarakat Spektra: Jurnal Fisika dan Aplikasinya Journal of Technomaterial Physics PROSIDING SEMINAR NASIONAL FISIKA (E-JOURNAL)
Tua Raja Simbolon
Departemen Fisika, Fakultas Matematika Dan Ilmu Pengetahuan Alam, Universitas Sumatera Utara Jalan Bioteknologi No.1 Kampus USU, Medan, 20155
Aerospace Engineering Agriculture, Biological Sciences & Forestry Astronomy Civil Engineering, Building, Construction & Architecture Control & Systems Engineering Earth & Planetary Sciences Education Electrical & Electronics Engineering Energy Law, Crime, Criminology & Criminal Justice Materials Science & Nanotechnology Physics Social Sciences Other

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Characteristic of microstructure and magnetic properties in LaFeO3 using co-precipitation method Tua Raja Simbolon; Muhammadin Hamid; Martha Rianna; Yoga Pratama; Timbangen Sembiring; Junedi Ginting; Achmad Maulana Soehada Sebayang; Eko Arief Setiadi; Anggito P. Tetuko; Perdamean Sebayang
Journal of Aceh Physics Society Volume 11, Number 2, April 2022
Publisher : PSI-Aceh

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.24815/jacps.v11i2.23691

Abstract

Abstrak. Perkembangan penelitian material ferit memiliki karakteristik mikrostruktur dan sifat magnetik yang berbeda-beda. Karakteristik mikrostruktur dan sifat magnetik dari Fe3O4 dan LaFeO3 telah berhasil dilakukan menggunakan metode ko-presipitasi lanthanum klorida dan pasir besi alam digunakan sebagai prekursor untuk preparasi sintesis nanopartikel Fe3O4 LaFeO3. Rasio molar antara lanthanum klorida dan pasir besi alam adalah 1:1, dan tanpa lanthanium. Karakterisasi sampel menggunakan XRD, SEM dan VSM. Hasil XRD menunjukkan bahwa kedua sampel telah memiliki fase tunggal tanpa pengotor kristal seperti La2O3 atau Fe2O3. Hasil morfologi SEM menunjukkan bahwa Fe3O4 dan LaFeO3 memiliki ukuran partikel yang random. Histogram distribusi sebaran partikel untuk kedua sampel ini menunjukkan range 50-300 nm. Sifat magnetik dari sampel Fe3O4 memiliki Ms= 20 emu/g, Mr= 9 emu/g dan H= 400 Oe, sedangkan sifat magnetik LaFeO3 yaitu Ms= 10 emu/g, Mr= 8 emu/g dan H= 410 Oe. Hasil mikrostruktur dan sifat magnetik dalam penelitian ini dapat mendukung dalam pembuatan magnet permanen.  Abstract. The development of research on ferrite materials has different microstructural characteristics and magnetic properties. The microstructural characteristics and properties of Fe3O4 and LaFeO3 have been successfully carried out using the co-precipitation method. Lanthanum chloride and natural iron sand were used as precursors for the preparation of the synthesis of Fe3O4 LaFeO3 nanoparticles. The molar ratio between lanthanum chloride and natural iron sand is 1:1, and without lanthanium. Sample characterization using XRD, SEM and VSM. The XRD results show that the second sample already has a single phase without crystal impurities such as La2O3 or Fe2O3. SEM morphology results show that Fe3O4 and LaFeO3 have random particle sizes. Histograms of particle distribution distribution for these two samples show the range of 50-300 nm. The nature of the sample Fe3O4 has Ms= 20 emu/g, Mr= 9 emu/g and H= 400 Oe, while the specific properties of LaFeO3 are Ms= 10 emu/g, Mr= 8 emu/g and H= 410 Oe. The results of the microstructure and magnetic properties in this study can support the manufacture of permanent magnets
Preparation and characterization of ZnFe2O4 on the microstructures and magnetic properties Tua Raja Simbolon; Timbangan Sembiring; Muhammadin Hamid; David Arianto Hutajulu; Martha Rianna; Achmad Maulana Soehada Sebayang; Anggito P Tetuko; Eko Arief Setiadi; Masno Ginting; Perdamean Sebayang
Journal of Aceh Physics Society Volume 10, Number 2, April 2021
Publisher : PSI-Aceh

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.24815/jacps.v10i2.18710

Abstract

Abstrak. Telah berhasil dilakukan sintesis ZnFe2O4 menggunakan metode sol-gel. ZnO dan serbuk Fe3O4 dicampur dan dipanaskan menggunakan hotplate pada suhu 60oC selama satu jam. Efek dari doping ZnO pada mikrostruktur, morfologi dan sifat magnet dikarakterisasi menggunakan XRD, SEM dan VSM. Hasil dari XRD dan SEM mengkonfirmasi bahwa struktur ZnFe2O4 spinel ferit menunjukkan kristal rata-rata 1 μm. Kemudian sifat kemagnetan ZnFe2O4 yang dikonfirmasi bersifat paramagnetik dengan kondisi optimum dari sifat kemagnetan tersebut tercantum sebagai berikut: Ms 0.4 emu×g-1, Mr 0.2 emu×g-1, dan Hc 230 Oe.Abstract. ZnFe2O4 have been synthesized using sol-gel method. ZnO, and Fe3O4 powder was mixing with hotplate for one hour in 60oC. Effect of ZnO doped on microstructure, morphology and magnetic properties were investigated using XRD, SEM and VSM. The result of XRD and SEM confirmed that the ZnFe2O4 structure of spinel ferrite has average crystal of 1 μm. The magnetic properties of ZnFe2O4 confirmed paramagnetic with the optimum condition of the magnetic properties are listed in the following: Ms 0.4 emu×g-1, Mr 0.2 emu×g-1, and Hc 230 Oe.Keywords: ZnFe2O4, Sol-gel method, Microstructures, Magnetic Properties.
KRITERIA PLANET LAYAK HUNI SEBAGAI ANALISIS KEBERADAAN DOPPELGANGER BUMI Berthianna Nurcresia; Tua Raja Simbolon; Lu'lu Rihhadhatul Aisy; Manis Sembiring; Johny Setiawan
Gravity : Jurnal Ilmiah Penelitian dan Pembelajaran Fisika Vol 5, No 1 (2019)
Publisher : Universitas Sultan Ageng Tirtayasa

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (375.33 KB) | DOI: 10.30870/gravity.v5i1.5213

Abstract

PENGARUH WAKTU DRY MILLING TERHADAP KARAKTERISTIK DAN SIFAT MAGNET PERMANEN ND-FE-B William William; Tua Raja Simbolon; Herli Ginting; Prijo Sardjono; Muljadi Muljadi
Spektra: Jurnal Fisika dan Aplikasinya Vol 1 No 1 (2016): SPEKTRA: Jurnal Fisika dan Aplikasinya, Volume 1 Nomor 1, Agustus 2016
Publisher : Program Studi Fisika Universitas Negeri Jakarta

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (281.938 KB) | DOI: 10.21009/SPEKTRA.011.03

Abstract

Abstrak Telah dilakukan proses penghalusan serpihan NdFeB dengan menggunakan metode dry milling dalam atmosfir gas inert dengan menggunakan gas Nitrogen (N2) dengan bahan awal yang digunakan berupa serpihan NdFeB dengan waktu milling yang divariasikan selama 8 jam, 16 jam, 24 jam dan 48 jam. Besaran magnetik yang diukur adalah koersivitas (Hc), induksi remanensi magnetik (Br) dan energi produk maksimum (BHmaks). Proses preparasi sampel dimulai dengan penghalusan serpihan dengan berbagai variasi waktu milling, dicetak dengan gaya 7 tonf selama 2 menit, dan dengan ditambahkan bahan perekat celuna sebanyak 3 wt%, hingga membentuk pelet dengan diameter ±1,6 cm. Selanjutnya sampel pelet di heat treatment selama 1 jam pada suhu 170ᵒC dan setelah itu dilakukan coating pada sampel. Sampel pelet yang telah melalui proses heat treatment, dimagnetisasi dengan impulse magnetizer pada tegangan 1500V DC. Sampel pelet yang telah dimagnetisasi diukur fluks density menggunakan Gaussmeter. Dari nilai densitas fluks magnet sampel, diperoleh sampel terbaik yaitu sampel hasil milling selama 48 jam pada suhu heat treatment 170ᵒC dan diperoleh fluks magnet sebesar 485,8 Gauss. Koersivitas pelet NdFeB yaitu 1,171 kOe dan BHmaks sebesar 0,62 MGOe. Kata-kata kunci: NdFeB, heat treatment, dry milling, gas inert Abstract Particle refining process of flakes NdFeB by dry milling method within an inert gas atmosphere using Nitrogen gas (N2) with based material was flakes NdFeB and with milling time parameters were variated for 8 hours, 16 hours, 24 hours and 48 hours had been done. The measured magnetic properties were coercivity (Hc), remanence (Br) and maximum energy product (BHmax). The preparation raw material process was started with particle refining with milling time variety, then it was pressed with 7 tonf force for 2 minutes and with added adhesive celuna as much as 3 wt% up to become pellets form with a diameter ±1.6 cm. Further the pellet samples were given heat treatment for 1 hour at temperature 170ᵒC and after that all the samples were coated. Pellet samples that have been done heat treatment, were magnetized with the impulse magnetizer in 1500V DC voltage. Pellet sample that had been magnetized ,its flux density was measured by using a Gaussmeter. From the magnetic flux density sample value, the best sample that obtained was the sample in milling time for 48 hours at heat treatment’s temperature was 170ᵒC and obtained magnetic flux density at 485.8 Gauss. The NdFeB pellet coercivity was 1.171 kOe and the BHmax was 0.62 MGOe. Keywords: NdFeB, heat treatment , dry milling , inert gas
ANALISIS DAN VISUALISASI PERSAMAAN KLEIN-GORDON PADA ELEKTRON DALAM SUMUR POTENSIAL DENGAN MENGGUNAKAN PROGRAM MATHEMATIC 10 Syahrul Humaidi; Tua Raja Simbolon; Russell Ong; Widya Nazri Afrida
PROSIDING SEMINAR NASIONAL FISIKA (E-JOURNAL) Vol 5 (2016): PROSIDING SEMINAR NASIONAL FISIKA (E-JOURNAL) SNF2016
Publisher : Program Studi Pendidikan Fisika dan Program Studi Fisika Universitas Negeri Jakarta, LPPM Universitas Negeri Jakarta, HFI Jakarta, HFI

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (783.23 KB) | DOI: 10.21009/0305020504

Abstract

Schrödinger equation is a wave equation that describes the behaviour of an electron including determining its energy levels. However, when the motion of electrons was assumed as relativistic motion(vc), then the schrödinger equation must be changed into Klein-Gordon equation(relativistic Schrödinger equation). In order to compare both equations, we analyzed and visualized the Klein-Gordon equation for an electron in a potential well with Wolfram Mathematica 10 software. The visualization from Mathematica 10 gave the same wavefunction graphs and probability density graphs as the Schrödinger equation. The difference is only in the visualization of energy levels graphs. Keywords:Klein-Gordon equation, Mathematica 10, electron, energy levels.
Community Empowerment Through Improving Weaving Skills to Support the Achievement of Sustainable Development Goals (SDGs) Barus, Diana Alemin; Gustanto; Masmur, Indra; Tua Raja Simbolon
ABDIMAS TALENTA: Jurnal Pengabdian Kepada Masyarakat Vol. 10 No. 1 (2025): ABDIMAS TALENTA: Jurnal Pengabdian Kepada Masyarakat
Publisher : Talenta Publisher

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.32734/abdimastalenta.v10i1.20079

Abstract

Sustainable economic growth is a challenge for Indonesia today. The Universitas Sumatera Utara in Strengthening SDGs promotes decent and inclusive employment opportunities, and enhances sustainable economic growth in Indonesia by working with companies, civil society organisations, and governments to create an environment that supports inclusive economic development and provides fair access to employment opportunities. The community service team through the community service institution of the Universitas Sumatera Utara plays an active role in the success of the SDGs by carrying out community service with MSME partner Kilang Tenun Sinaga. The results of the team's observations that Kilang Tenun Sinaga MSMEs have such important problems, namely the difficulty of finding employees with skilled weaving skills that cause a lack of weaving production processes that can be fulfilled when ordered, lack of employees who can increase production results, unable to expand by opening new promotional outlets while promoting production results. The solution presented by the team is to carry out community empowerment through improving weaving skills so that they will get the expected employees. This community service team with partners also through this service aims to continue weaving skills, especially ulos motifs, to become part of the world heritage in the future. From this solution, employees also get decent work and improve the community's economy in accordance with SDGs goal no. 8, namely decent work and economic growth.
Liquid Smoke-Based Pest and Disease Control for the Sekar Wangi Farmer Group in Padang Cermin Village, Selesai District, Langkat Regency Kerista Tarigan; Rikson Asman Fertiles Siburian; Tua Raja Simbolon; Leo Ferdinan Hermando Hutabarat; Dewi Jernita Hulu; Natalia Lawolo; Jois Domini; Ramona Sefaca Situmorang
ABDIMAS TALENTA: Jurnal Pengabdian Kepada Masyarakat Vol. 11 No. 1 (2026): ABDIMAS TALENTA: Jurnal Pengabdian Kepada Masyarakat
Publisher : Talenta Publisher

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.32734/abdimastalenta.v11i1.26139

Abstract

The excessive use of synthetic pesticides remains one of the major challenges in developing environmentally friendly agriculture. This community service program aimed to improve the knowledge and skills of members of the Sekar Wangi Farmer Group in producing and applying liquid smoke as a botanical pesticide. The activity was conducted in Padang Cermin Village, Selesai District, Langkat Regency, involving 20 active farmer group members. The methods included counseling, hands-on training on liquid smoke production through coconut shell pyrolysis, field demonstrations, mentoring, monitoring, and evaluation using pre-test and post-test instruments. The results showed a significant increase in participants’ understanding and practical skills. The average level of knowledge increased from 58% before the training to 89% after the activity. Participants were able to independently produce liquid smoke and apply it as an alternative pest and disease control agent. The program also resulted in a simple standard operating procedure (SOP) for liquid smoke production and application. The activity contributed to reducing dependence on synthetic pesticides while encouraging the utilization of local biomass waste and sustainable agricultural practices.
Preparation and Characterization of Conductive Plastics Using Cassava Peel Waste and Addition of CuSO4 Syahrul Humaidi; Tua Raja Simbolon; Muliyati Muliyati
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.v2i1.5272

Abstract

This study investigated the characteristics of a conductive plastic based on root starch and CuSO4 filler. The mixture variation was (95:5)%; (90:10)%; (85:15)%; (80:20)% and (75:25)%. Glycerol is used to change the material as desired (plasticizer) which is called a plasticizer. The method used in the manufacture of this material is melt intercalation. Mechanical testing includes tensile strength (tensile strength) and elongation at break. Thermal testing was done using DTA (Differential Thermal Analysis) and material conductivity testing. The characterization results showed that the optimum starch composition: CuSO4 (75:25)% had a conductivity value of 7.3 x 10-2S.m-1, a thermal test value of 410ºC. The optimum tensile strength value occurs in the composition (80:20)% with a value of 4.606 MPa
Co-Authors Achmad Maulana Soehada Sebayang Anggito P Tetuko Anggito P. Tetuko Berthianna Nurcresia David Arianto Hutajulu Dewi Jernita Hulu Diana Alemin Barus, Diana Alemin Eko Arief Setiadi Eko Arief Setiadi Gustanto Herli Ginting Indra Masmur Johny Setiawan Jois Domini Junedi Ginting Kerista Tarigan Leo Ferdinan Hermando Hutabarat Lu'lu Rihhadhatul Aisy Manis Sembiring Martha Rianna Masno Ginting Muhammadin Hamid Muhammadin Hamid Muliyati Muliyati Muljadi Muljadi Nasution, Delima Lailan Sari Natalia Lawolo Nelly L. Ompusunggu Perdamean Sebayang Perdamean Sebayang Prijo Sardjono Rahmadhani Banurea Ramona Sefaca Situmorang Rikson Asman Fertiles Siburian Russell Ong Syahrul Humaidi, Syahrul Timbangan Sembiring Timbangen Sembiring Widya Nazri Afrida William William Yoga Pratama