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All Journal Jurnal Penelitian Fisika dan Aplikasinya (JPFA) Journal of Aceh Physics Society JURNAL PENGABDIAN KEPADA MASYARAKAT Journal of Applied Engineering and Technological Science (JAETS) Journal of Sustainable Community Development (JSCD) Journal of Technomaterial Physics Jurnal Natural
Martha Rianna
Departemen Fisika, Universitas Sumatera Utara, 20155 Medan, Indonesia
Agriculture, Biological Sciences & Forestry Arts Humanities Astronomy Biochemistry, Genetics & Molecular Biology 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 Environmental Science Immunology & microbiology Industrial & Manufacturing Engineering Languange, Linguistic, Communication & Media Materials Science & Nanotechnology Neuroscience Physics Social Sciences

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Management of Electric Field under the Sag of High Voltage Overhead Transmission Lines Mester Sitepu; Martha Rianna
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.
Influence of Mode of Hydrothermal Treatment and Precursor State on Phase Formation and Crystallinity of Sodium Titanate Ervina Putri Wulandari; Zikri Noer; Martha Rianna; Syahrul Humaidi; Muhammad Abduh Akram Agus; Alya Nazwariva; Jihan Murtadha Rambe
Journal of Technomaterial Physics Vol. 8 No. 1 (2026): Journal of Technomaterial Physics
Publisher : Talenta Publisher

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.32734/jotp.v8i1.24729

Abstract

Sodium titanate was synthesized via a sol–gel-assisted hydrothermal method to study phase evolution and crystallinity under different hydrothermal treatment conditions and precursor compositions. Four processing routes were designed: continuous hydrothermal treatment (24 h), interrupted hydrothermal cycles (3 × 8 h), dried-gel hydrothermal treatment, and fresh-gel hydrothermal treatment. X-Ray Diffraction (XRD) was used to analyze the resulting crystal phases and crystallite sizes. Continuous treatment of fresh gel produced monoclinic Na₂Ti₆O₁₃ with small crystallites (12.4 nm), while interrupted processing increased crystallite size to 15.5 nm. Pre-drying of the sol–gel precursor prior to continuous hydrothermal treatment yielded well-defined Na₂Ti₆O₁₃ with enhanced crystallinity and larger crystallites (27.6 nm). In contrast, insufficient precursor stabilization redirected phase evolution toward monoclinic Na₂TiO₃ despite comparable crystallite size. The results demonstrate that the hydrothermal treatment mode primarily governs crystallite growth, whereas the precursor state controls phase selectivity. These findings provide a clear synthesis–structure relationship for tailoring sodium titanate materials.
Co-Authors Achmad Maulana Soehada Sebayang Adhi Wibowo Agoez Loeqman Alya Nazwariva Anggito P Tetuko Anggito P. Tetuko Awan Pelawi Dadan Ramdan David Arianto Hutajulu Eko Arief Setiadi Eko Arief Setiadi Ervina Putri Wulandari Fitri Handayani Goldbert Harmuda Duva Sinaga Habib Satria Hariyati Lubis, Hariyati Herty Afrina Sianturi Herty Afrina Sianturi Indri Dayana Jihan Murtadha Rambe Juliaster Marbun Junedi Ginting Marhaposan Situmorang Marhaposan Situmorang Marhaposan Situmorang Masno Ginting Mester Sitepu Moranain Mungkin Muhammad Abduh Akram Agus Muhammad Fadlan Siregar Muhammadin Hamid Muhammadin Hamid Perdamean Sebayang Perdamean Sebayang Putri Cahaya Situmorang Siahaan, Doni Aldo Siti Utari Rahayu Syahrul Humaidi, Syahrul Timbangan Sembiring Timbangen Sembiring Tua Raja Simbolon Wina Rahmadani Rangkuti Yoga Pratama Zikri Noer Zikri Noer