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All Journal Jurnal Sains Materi Indonesia Indonesian Physical Review Kappa Journal
Adnyana, I Gusti Agung Putra
Physics Study Program, Faculty Of Mathematics And Natural Sciences, Udayana University, Badung, Bali, Indonesia
Astronomy Education Materials Science & Nanotechnology Physics Other

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Analisa Konsentrasi Logam Cd Pada Rhizophora.Sp Menggunakan Metode AAS Di Kawasan Pelabuhan Gilimanuk Jembrana Bali Karel Yesaya Mbaba; Ida Bagus Made Suryatika; I Gusti Agung Putra Adnyana
Kappa Journal Vol 3 No 2 (2019): Desember
Publisher : Universitas Hamzanwadi

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.29408/kpj.v3i2.1639

Abstract

In this study, research was conducted on the analysis of Cu concentrations in mangrove plants (Rhizophora.sp) using the Atomic Absorbtion Spectrophotometry (AAS) method in the Gilimanuk Jembrana port area of Bali. The research was conducted on June 23, 2019 until July 28, 2019 in the Faculty of Mathematics and Natural Sciences, Udayana University. The method used is Atomic Absorption Spectrophotometry (AAS), a principle that is based on the process of absorption of energy by atoms that are at the level of basic energy (groundstate). The sample used is in the form of root stems and leaves of mangroves that are cleaned and destroyed in advance, because AAS can only analyze the material in the form of liquid. The results of the analysis with AAS are the Cd metal content at Gilimanuk port has exceeded the threshold of the quality standard that is in accordance with sea water quality standards according to Environmental Decree Number: KEP-MEN LH No.51 / Men KLH / 2004 Cd threshold for tourism marine is 0,002 ppm and for biota is 0,001 ppm, while mangrove is included in marine tourism with a threshold of 0,002 ppm.
PENGARUH KETEBALAN LAPISAN PENYANGGA GaN TERHADAP STRUKTUR KRISTAL DAN SIFAT OPTIK FILM TIPIS GaN DITUMBUHKAN DENGAN METODE PULSED LASER DEPOSITION I Gusti Agung Putra Adnyana; Komang Ngurah Suarbawa; I Ketut Sukarasa
Jurnal Sains Materi Indonesia Vol 11, No 1: OKTOBER 2009
Publisher : Center for Science & Technology of Advanced Materials - National Nuclear Energy Agency

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (285.47 KB) | DOI: 10.17146/jsmi.2009.11.1.4560

Abstract

PENGARUH KETEBALAN LAPISAN PENYANGGA GaN TERHADAP STRUKTUR KRISTAL DAN SIFAT OPTIK FILM TIPIS GaN DITUMBUHKAN DENGAN METODE PULSED LASER DEPOSITION. Telah dilakukan studi pengaruh ketebalan lapisan penyangga Galium Nitrida, GaN terhadap struktur kristal dan sifat optik film tipis GaN yang ditumbuhkan dengan metode Pulsed Laser Deposition (PLD). Lapisan penyangga ditumbuhkan pada suhu 450ºC dan laju aliran nitrogen 100 sccm dengan waktu deposisi divariasikan antara 15 menit sampai 45 menit. Film yang diperoleh dikarakterisasi dengan Profilometer DEKTAK IIA, Difraktometer sinar-X dan Spektroskopi UV-Vis. Ketebalan lapisan penyangga berpengaruhterhadap kualitas kristal dan sifat optik film tipis GaN yang ditumbuhkan di atasnya. Dari hasil analisis pola difraksi sinar-X dan spektrum UV-Vis, diketahui bahwa film tipis GaN yang ditumbuhkan di atas lapisan penyangga dengan ketebalan 184,6Å cenderungmemiliki orientasi tunggal (0002) yang lebih baik dengan Full Width at Half-Maximum (FWHM) 0,9º dan energi celah pita (Eg) = 3,4 eV dibanding film tipis GaN dengan ketebalan lapisan penyangga 370,2 Å dan 560 Å.
SOLUTION OF THE TIME-INDEPENDENT SCHRÖDINGER EQUATION FOR THE ROSEN–MORSE POTENTIAL BY USING THE GALERKIN METHOD Widagda, I Gusti Agung; Artawan, Nengah; Trisnawati, Ni Luh Putu; Adnyana, I Gusti Agung Putra; Paramarta, Ida Bagus Alit
Indonesian Physical Review Vol. 8 No. 3 (2025)
Publisher : Universitas Mataram

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.29303/ipr.v8i3.492

Abstract

This study presents a numerical solution to the time-independent Schrödinger equation (TISE) for the Rosen-Morse potential using the Galerkin method. The Rosen-Morse potential, commonly used in atomic and molecular physics, has known analytical solutions under certain conditions. By transforming the TISE into a Jacobi differential equation, the analytical wave function and energy levels can be derived. However, analytical solutions are limited to ideal cases, highlighting the need for numerical methods in more general scenarios. The Galerkin method is implemented by expanding the wave function using Sine basis functions and projecting the TISE onto this basis. The resulting eigenvalue problem is solved by constructing the Hamiltonian matrix from kinetic and potential energy operators. Numerical results from the Galerkin method are compared with analytical solutions using graphical analysis, percentage error (% error), and statistical tests, including the Mann-Whitney U test. The results demonstrate that the probability densities obtained using the Galerkin method closely approximate the analytical solution. This is visually evident from the overlapping of probability density plots from both methods. The percentage error of the probability densities is below 1 %, entirely.  Furthermore, the Mann–Whitney U test yields a p-value less than 0.05, indicating that the differences between the two sets of probability densities are statistically insignificant at the 95% confidence level. These findings highlight the Galerkin method’s effectiveness and accuracy as a robust numerical tool for solving the TISE with the Rosen-Morse potential.  
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.
Co-Authors Artawan, Nengah Husnul Hatimah Husnul Hatimah, Husnul I Gde Antha Kasmawan I Kadek Agus Sara Sawita I Nengah Sandi I Nyoman Gede Putra Wibawa I Putu Agum Suriajaya Maha Putra I Wayan Supardi Ida Bagus Alit Paramarta Ida Bagus Made Suryatika Ita Purnamaimun Jalut, Laura Laudensia Senly Kadek Ayu Rahmanuca Sabathiningsih Karel Yesaya Mbaba Komang Ngurah Suarbawa Laura Laudensia Senly Jalut Made Cingah Ni Luh Putu Trisnawati Ni Nyoman Rupiasih Ni Nyoman Susi Kesuma Wardani Nurmalasari, Ni Putu Yuni Purnamaimun, Ita Putu Ekayani Sri Tussniari Rosvita Hilbrida Sulastri Sukarasa, I Ketut Trisnawati, Ni Luh Putu Wardani, Ni Nyoman Susi Kesuma Widagda, I Gusti Agung Wisnu Ari Adi Wisnu Ari Adi Wisnu Ari Adi