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All Journal Saintia Fisika Journal of Aceh Physics Society Indonesia Berdaya Jurnal Polimesin
Hilda Ayu Marlina
Program Studi Magister (S2) Fisika, Fakultas MIPA, Universitas Sumatera Utara, Jalan Bioteknologi No. 1 Kampus USU, Medan 20155, Indonesia
Arts Humanities Automotive Engineering Control & Systems Engineering Economics, Econometrics & Finance Education Engineering Health Professions Materials Science & Nanotechnology Mechanical Engineering Medicine & Pharmacology Nursing Physics Public Health Social Sciences Veterinary Other

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Effect of Rolling Process on Critical Temperature (Tc) in Ag/Bi1,6Pb0,4Sr2Ca2Cu3O10 Superconducting Wire with Addition of CNT Manufacture Hilda Ayu Marlina; Agung Imaduddin; Kerista Sebayang; Pius Sebleku
Journal of Aceh Physics Society Volume 7 Number 1, January 2018
Publisher : PSI-Aceh

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Abstract

Analisa pengaruh proses penarikan (rolling) terhadap suhu kritis (Tc) dalam pembuatan kawat superkonduktor Ag/Bi1,6Pb0,4Sr2Ca2Cu3O10 dengan penambahan CNT (carbonnanotube) telah dilakukakan. Kawat superkonduktor Ag/Bi1,6Pb0,4Sr2Ca2Cu3O10 dengan penambahan CNT merupakan kawat superkonduktor berbasis bismuth dengan penambahan CNT yang diselubungi Ag (Argentum), dalam penelitian ini Ag yang digunakan berdiameter awal 8 mm. Pembuatan kawat Ag/Bi1,6Pb0,4Sr2Ca2Cu3O10 dengan penambahan CNT tersebut dilakukan menggunakan metode PIT (Powder in Tube). Salah satu proses dalam metode PIT yang mempengaruhi suhu kritis (Tc) kawat Ag/Bi1,6Pb0,4Sr2Ca2Cu3O10 dengan penambahan CNT adalah proses penarikan (rolling). Dalam penelitian ini, Tc optimum didapatkan pada penarikan pertama dengan diameter kawat menjadi 5 mm dengan nilai Tconset 109,17 K dan nilai Tczero 71 K. Namun, pada penarikan kedua (penarikan berulang) hingga kawat berdiameter 2,6 mm diperoleh nilai Tconset sebesar 90 K, tetapi Tczero tidak dihasilkan. The analysis of rolling process to critical temperature (Tc) in the manufacture of Ag/Bi1,6Pb0,4Sr2Ca2Cu3O10 superconducting wire with additional CNT (carbonnanotube) has been done. The Ag/Bi1,6Pb0,4Sr2Ca2Cu3O10 superconducting wire with additional CNT is a superconducting wire based on bismuth by adding CNT shrouded by Ag (Argentum), in this study Ag used an initial diameter of 8 mm. This wire manufacture is done by using PIT (Powder in Tube) method. One of processes in the PIT method wich affect on Tc value is the process of withdrawal (rolling). In this study, the optimum Tc obtained at the first rolling with wire diameter to 5 mm with Tconset 109.17 K and Tczero 71 K. However, in the second rolling (rolling repeatedly) until the 2.6 mm diameter wire produced a value of Tconset of 90 K, but Tczero not produced. Keywords: Ag/Bi1,6Pb0,4Sr2Ca2Cu3O10, CNT, PIT method, RollingFERERENCESAbbas, M.M. et.al. 2015. “Superconducting Properties of Bi2-xSbxPb0,3Sr1,9Ba0,1Ca2Cu3O10+δ”. Journal of Applied Sciences Research. No. 22. Hal 164-172. Dadras, Y. Liu, Y.S. Chai, V. Daadmehr, K.H. Kim, Physica C 469 (2009) 55.De Bruyn Ouboter, R., Van Delft, D., Kes, P. H. 2012. “Discovery and Early History of Superconductivity”. In H. Rogalla, P. H. Kes (Eds.), 100 years of superconductivity (pp.1-29). Boca Raton, FL: CRC Press.Galvan, A. Durán, F.F. Castillón, E. Adem, R. Escudero, D. Ferrer, A. Torres, M. José-Yacamán, J. Supercond. Nov. Magn. 21 (2008) 271.Galvan, D.H., J.H.Kim., M.B. Maple, Hirata, G.A., dan E. Adem. 2000. Flux Pinning Effect of Embedded Carbon Nanotubes in Bi2Sr2CaCu2O8. Physica C, Vol : 341-348 : 1269-1270.Galvan, Shi Li, W.M. Yuhasz, J.H. Kim, M.B. Maple, E. Adem, Physica C 403 (2004) 145.Jabur, Akram R. 2012. “B2223 High Temperature Superconductor Wires in Silver Sheath, Filament Diameter Effect on Critical Temperature and Current Density”. Energy Procedia. 18. Hal 254-264.Joshua, dkk. 2016. Pembuatan Kawat Superkonduktor BSCCO-2223. Laporan Kerja Praktik.Lusiana. 2013. “Proses Pembuatan Material Superkonduktor BSCCO dengan Metoda Padatan”. Majalah Metalurgi. V 28.2.2013. Hal 73-82.Nurmalita. 2011. “The Effect of Pb Dopant On The Volume Fraction Of BSCCO-2212 Superconduntucting Crystal”. Jurnal Natural Vol. 11, No. 2.Rey, Christopher. 2015. “Superconductors in The Power Grid”. Woodhead Publishing.  pp : 86.Z.Q. Yang, X.D. Su, G.W. Qiao, Y.C. Guo, S.X. Dou, F.R. de Boer, Physica C 325 (1999)
PEMBUATAN MAGNET BONDED PERMANEN PrFeB DENGAN BINDER POLYESTER DAN SILICONE RUBBER Hilda Ayu Marlina
Saintia Fisika Vol 5, No 1 (2013): Saintia Fisika
Publisher : Saintia Fisika

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Abstract

Research on fabrications of bonded magnets PrFeB type MQEP 16-7 with polyester and silicone rubber binder has been done. The purpose of this study is determination of the effect of polyester and silicone rubber matrix on the mechanical and magnetic properties in the manufacture of bonded magnets PrFeB. The process of fabrications bonded magnets PrFeB made by mixing powder and magnets PrFeB respectively - each with variations binder composition (wt%) are 2, 4, 6, and 8. For each sample takes 8 grams total mass of bonded magnets PrFeB. The samples were made by using compression molding method with a sample pressure of 5 tons. Curing temperature of 150° C for samples bonded magnet with polyester binder and room temperature for samples bonded magnet with silicone rubber binder. The results showed that the best magnetic field derived from the manufacture of bonded magnets with the addition of 2% silicone rubber binder at 1156.9 G and energy product (BH)max 9.15 MGOe, with a value of 10.4 BHN Brinell hardness and compressive strength of 22.3 MPa.Keywords: Bonded magnet, PrFeB, polyester, silicone rubber, magnetic properties, mechanical properties
Sosialisasi Pemanfaatan Limbah Minyak Jelantah Menjadi Sabun Cuci Piring Di Kelurahan Medan Tenggara Kota Medan (Socialization of the Utilization of Used Cooking Oil as Dishwashing Soap in the Southeast Medan District, Medan City) Setiawan, Eka; Marlina, Hilda Ayu; Nababan, Letareana Agustri; Purba, Ayu Lestari D. A; Putri, Tisara Eka; Manurung, Nurhasanah; Azis, Bunga Khairani
Indonesia Berdaya Vol 6, No 1 (2025)
Publisher : UKInstitute

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.47679/ib.2025979

Abstract

Pengabdian Kepada Masyarakat (PKM) mengenai sosialisasi pemanfaatan limbah minyak jelantah menjadi sabun cuci piring dilakukan pada 21 Agustus 2024 di Kelurahan Medan Tenggara-Kecamatan Medan Denai-Kota Medan. PKM ini terdiri dari 3 tahapan yaitu sosialisasi mengenai dampak negatif dari limbah minyak jelantah, pemberdayaan kepada Ibu-Ibu Rumah Tangga (IRT) melalui sosialisasi pembuatan sabun cuci piring dari minyak jelantah, dan kuesioner. Tujuan Pengabdian Masyarakat ini adalah memberikan pemahaman kepada IRT di Kelurahan Medan Tenggara-Kecamatan Medan Denai-Kota Medan mengenai dampak negatif dari limbah minyak jelantah bagi tubuh, menanggulangi dampak negatif dari limbah minyak jelantah yang dibuang sebarangan, serta menangani pengolahan limbah minyak jelantah menjadi sabun cuci piring yang bernilai ekonomis. Pengabdian masyarakat ini diikuti oleh 21 orang IRT di Kelurahan Medan Tenggara-Kecamatan Medan Denai-Kota Medan. Hasil analisis kuesioner yang telah dibagikan kepada peserta menunjukkan mereka sangat setuju atau setuju bahwa kegiatan ini sangat bermanfaat, paham mengenai dampak negatif penggunaan minyak jelantah, dan para peserta ingin mempraktikkan pembuatan sabun cuci piring.  Abstract. Community Service (PKM) regarding the socialization of the utilization of used cooking oil waste into dishwashing soap was carried out on August 21, 2024 in Medan Tenggara Village-Medan Denai District-Medan City. This PKM consists of 3 stages, namely socialization regarding the negative impacts of used cooking oil waste, empowerment of Housewives (IRT) through socialization of making dishwashing soap from used cooking oil, and questionnaires. The purpose of this Community Service is to provide an understanding to IRT in Medan Tenggara Village-Medan Denai District-Medan City regarding the negative impacts of used cooking oil waste on the body, overcome the negative impacts of used cooking oil waste that is disposed of carelessly, and handle the processing of used cooking oil waste into dishwashing soap that has economic value. This community service was attended by 21 IRT in Medan Tenggara Village-Medan Denai District-Medan City. The results of the questionnaire analysis that had been distributed to participants showed that they strongly agreed or agreed that this activity was very useful, understood the negative impacts of using used cooking oil, and the participants wanted to practice making dish soap.
Physical and mechanical properties of fiberboard made from corn cob and coconut fiber with natural adhesives Hasanah, Moraida; Marlina, Hilda Ayu; Zahar, Intan; Kadir, Abdul Azis
Jurnal Polimesin Vol 22, No 2 (2024): April
Publisher : Politeknik Negeri Lhokseumawe

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.30811/jpl.v22i2.4915

Abstract

Developing fiberboard from agro-industrial and natural waste has a significant impact on environmental practices. Fiberboards made from corncobs and coconut fiber have become a desirable by-product that can serve as a wood substitute. This research aims to analyze the physical and mechanical properties of fiberboard composites created from coconut husks and corn cobs, using natural adhesives like tapioca glue and citric acid. Corn cob particles and coconut fruit fibers were weighed in a 1:1 ratio. Tapioca glue or citric acid was then added in varying percentages: 10%, 14%, 18%, 22%, and 26% of the total mixture. This blend was poured into molds, spread evenly with a spatula, and pressed under 30 kg/cm² (426.7 psi). Subsequently, the samples were carefully removed for physical and mechanical testing. The findings of the study indicated that the different mass variations of corncobs and coconut fibers mixed with natural adhesives successfully produced fiber composites that met the Japanese Industrial Standards (JIS) A 5095:2003 for the "hardboard" classification. The most effective composition was found in sample A5, which contained 26% tapioca glue. Tapioca glue proved to be the superior natural adhesive, surpassing citric acid. Tests conducted on fiberboard A5 revealed the highest density at 0.90 gr/cm³, the lowest porosity at 7.35%, optimal impact strength at 119.99 J/m², tensile strength of 730.50 MPa, and flexural strength of 109.34 MPa. Therefore, this fiberboard demonstrated favorable physical and mechanical properties.
Co-Authors Agung Imaduddin Azis, Bunga Khairani Kadir, Abdul Azis Kerista Sebayang Manurung, Nurhasanah Moraida Hasanah Nababan, Letareana Agustri Pius Sebleku Purba, Ayu Lestari D. A Putri, Tisara Eka Setiawan, Eka Zahar, Intan