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Nurmalasari, Ni Putu Yuni
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THE EFFECT OF BARIUM SUBSTITUTION WITH COMBINATIONS OF RARE EARTH ON PERMANENT MAGNETIC SURFACE MORPHOLOGY BASED ON BARIUM HEXAFERRITE Adnyana, I Gusti Agung Putra; Suarbawa, Komang Ngurah; Nurmalasari, Ni Putu Yuni; Adi, Wisnu Ari
Indonesian Physical Review Vol. 7 No. 2 (2024)
Publisher : Universitas Mataram

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.29303/ipr.v7i2.300

Abstract

The development of hard magnets today is progressing very rapidly. Developing hard magnets based on rare earth metals becomes a severe problem when the raw materials are not readily available. The chosen solution is to replace oxide-based permanent magnets with small amounts of rare earth metals substituted to improve their magnetic properties. This study synthesized a permanent magnet oxide based on barium hexaferrite doped with lanthanum and cerium atoms. In the synthesis of this material, a mechanical wet milling technique is used to obtain a single-phase permanent magnetic Ba1-β-γLaβCeγFe12O19 system with composition (β = 0 - 0.5 and γ = 0 - 0.1). The precursors are weighted according to their stoichiometric composition. Each mixed composition was milled by high energy milling (PW 1000 in the mixer/mill) at a milling speed of 1000 rpm using steel balls with an average diameter of 12 mm. Grinding conditions included a ball-to-powder weight ratio of 2:1, milling time 5 hours, then compacted with 7000 Psi pressure and sintered at 1200oC for 2 hours. The surface morphology and microstructure of the resulting sample particles were observed using scanning electron microscopy (SEM) with the SEM JEOL JED 305 brand. The characterization results show that the particles are hexagonally homogeneous in shape with particle sizes in the range of 1000-2000 nm for β = 0 and γ = 0 (without doping). In general, the four samples with varying concentrations of doping ions La3+ and Ce4+ showed homogeneous hexagonal structures but smaller particle sizes than pure barium hexaferrite. The sample particle sizes ranged from 500-1000 nm for β = 0.02 and 300-1000 nm for β = 0.04.
Identifikasi Pencemaran Air Lindi pada Kawasan Asrama di Kampus Universitas Udayana dengan Menggunakan Metode Geolistrik Konfigurasi Wenner Pratama, Maulana Rizki; Putra, I Ketut; Nurmalasari, Ni Putu Yuni; Sumadiyasa, Made; Sandi, I Nengah; Baskoro, Winardi Tjahyo
Kappa Journal Vol 7 No 2 (2023): Agustus
Publisher : Universitas Hamzanwadi

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.29408/kpj.v7i2.20842

Abstract

Dormitory land in the Udayana University area is often used as a place to dispose of garbage. Basically leachate contains metal content such as zinc (Zn) and mercury (Hg) which seep into the soil. Identification to determine the presence of leachate at a certain depth, can use the Wenner Configuration Geoelectrical Method. From the data obtained then processed using Res2dinv it was found that the leachate content in the Udayana University Dormitory Area is found at a distance of 33m, 43m, 63m, 83m, from the pile of garbage and a depth of 1.25 - 3.75m below the surface of the pile of garbage for coordinates 115.165240 BT, 8.798640 LS to 115.164955 BT, 8.799100 LS and a distance of 62m, 72m, 82m, from the garbage pile and a depth of 1.25 – 6.38m below the surface of the garbage pile at coordinates 115.165091 BT, 8.798557 LS to 115.164730 BT, 8.799021 LS.
Identifikasi Air Tanah Dengan Metode Geolistrik Konfigurasi Wenner Di Daerah Perumahan Pesraman Unud Bukit Jimbaran Bali Ratu, Trivena Sesilia; Wendri, Nyoman; Nurmalasari, Ni Putu Yuni; Putra, I Ketut; Suharta, I Wayan Gede; Baskoro, Winardi Tjahyo
Kappa Journal Vol 7 No 3 (2023): Desember
Publisher : Universitas Hamzanwadi

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.29408/kpj.v7i3.20928

Abstract

Identification of groundwater using the geoelectric method in the housing area of the Udayana University boarding house, Bukit Jimbaran, Bali. Data acquisition was carried out using the Wenner configuration to determine the location of the aquifer depth with rock resistivity values. This measurement parameter is the resistivity value of the rock which is then processed using the Res2dinv software for data mapping. After that, aquifer interpretation and geoelectric data interpretation is carried out. The results showed that the aquifer in the residential area of the Bukit Jimbaran Bali Udayana University boarding house is located at a relatively shallow depth of 1.25-12.4 meters below the ground surface. On tracks 1 and 2 have 3 groups of resistivity values. The resistivity value of 2.16–37.5 Ωm with a depth of 1.25-12.4 meters is suspected as a type of tufa lithology. The resistivity value of 72.8–226 Ωm with a depth of 1.25-12.4 meters is suspected to be limestone associated with tuff. The resistivity value of 423–1363 Ωm with a depth of 1.25-12.4 meters is suspected to be limestone.
Uji Posisi Sumur Bor Terhadap Akuifer Menggunakan Metode Audio Magnetotelluric (ADMT) Silalahi, Dio Carpry Gunawan; Simpen, I Nengah; Putra, I Ketut; Nurmalasari, Ni Putu Yuni; Suryatika, Ida Bagus Made; Kasmawan, I Gde Antha
Kappa Journal Vol 7 No 3 (2023): Desember
Publisher : Universitas Hamzanwadi

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.29408/kpj.v7i3.21468

Abstract

Research has been carried out regarding the position test of the drilled well against the aquifer at the Jimbaran Unud Campus on May 12, 2023. The borehole test was carried out using the Audio Magnetotelluric (ADMT) method. To ensure that the water needs of all students at Udayana are met, it is necessary to conduct research on drilled wells at Udayana whether they are suitable for aquifer positions (groundwater). The purpose of this study was to determine the suitability of the position of the drilled well to the aquifer in the ground behind the UNUD Rectorate Building. Based on the interpretation of the results of the research conducted in this paper, the aquifer position sought on line 1 is at a distance of 0–9 m and 21–50 m at a depth of 100–200 m below the ground surface, while on line 2 it is at a distance of 7–50 m at a depth of 100–140 m. Because the position of the Udayana drilled well is at 22.2 m on line 1 and 26.7 m on line 2 with a depth of 74 m, the Udayana drilled well is not yet in the aquifer position sought in this study.
Co-Authors Adnyana, I Gusti Agung Putra I Gde Antha Kasmawan I Ketut putra, I Ketut I Nengah Sandi I Nengah Simpen Ida Bagus Made Suryatika Komang Ngurah Suarbawa Made Sumadiyasa Nyoman Wendri Pratama, Maulana Rizki Ratu, Trivena Sesilia Silalahi, Dio Carpry Gunawan Tjahyo Baskoro, Winardi Wayan Gede Suharta Wisnu Ari Adi