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All Journal Jurnal Sains Materi Indonesia BULETIN FISIKA 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 Earth & Planetary Sciences Education Electrical & Electronics Engineering Environmental Science 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.
Studi Mitigasi Bencana Tsunami Dengan Menentukan Run Up Dan Waktu Tiba Tsunami Daerah Banyuwangi I Putu Agum Suriajaya Maha Putra; Komang Ngurah Suarbawa; I Gusti Agung Putra Adnyana
BULETIN FISIKA Vol 23 No 2 (2022): BULETIN FISIKA August Edition
Publisher : Departement of Physics Faculty of Mathematics and Natural Sciences, and Institute of Research and Community Services Udayana University, Kampus Bukit Jimbaran Badung Bali

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.24843/BF.2022.v23.i02.p08

Abstract

Tsunami disaster mitigation studies have been conducted in Banyuwangi Regency by conducting research on the analysis of run-ups and tsunami arrival times for the Banyuwangi area. The research was conducted at the Meteorology, Climatology and Geophysics Agency region 3 Denpasar using the software Tsunami Observation and Simulation Terminal (TOAST). The data used in this study is secondary data in the form of magnitude and data on the depth of underwater earthquakes, with magnitudes of 7.0 to magnitude 8.5 that have the potential to cause tsunamis and earthquake depth data of 18 km to 65 km. From the results of data processing with the TOAST application obtained the results of run-up and tsunami arrival time. Maximum run-up data was obtained by 9,718 m while the fastest tsunami arrival time data to the coast is 4 minutes after the tsunami. Maximum run-up data is then used for mitigation and the fastest tsunami arrival time then can be made a mitigation scenario for tsunami disaster.
Characterization Porosity on Ceramic Body Stoneware Based Kalimantan Clay Putu Ekayani Sri Tussniari; I Gusti Agung Putra Adnyana; Made Cingah
BULETIN FISIKA Vol 19 No 1 (2018): BULETIN FISIKA
Publisher : Departement of Physics Faculty of Mathematics and Natural Sciences, and Institute of Research and Community Services Udayana University, Kampus Bukit Jimbaran Badung Bali

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Abstract

It has been made ceramic body stoneware using a mixture of Kalimantan clay, RRC feldspar, Belitung kaolin, Belitung quartz and Bukit Jimbaran limestone further coded BPC-1. This study aims to determine the value of dry shrinkage, the effect of sintering temperature of 900oC and 1200oC against firing shrinkage, and the influence of sintering temperature of 900oC and 1200oC against porosity in the ceramic body stoneware. Ceramic stoneware burned with a temperature variation of 900oC and 1200oC. The results show the value of dry shrinkage in ceramic stoneware of 2.9%. Stoneware ceramic firing shrinkage at a temperature of 900 oC combustion of 1.3%, and the combustion at a temperature 1200oC of 3.8%. Porosity ceramic stoneware at a temperature of 900oC combustion showed porosity of 10.5%, while the combustion at a temperature 1200oC of 5.5%. Show that the combustion temperature greatly affects the value of dry shrinkage, firing shrinkage and porosity of stoneware ceramics. The higher the combustion temperature the higher the shrinkage and the decreasing the porosity.
Effect of Hokianti Mikro (Carmona Retusa) Leaves Extract Concentration on Dye Sensitized Solar Cell (DSSC) Kadek Ayu Rahmanuca Sabathiningsih; I Gusti Agung Putra Adnyana; Ni Luh Putu Trisnawati
BULETIN FISIKA Vol 24 No 1 (2023): BULETIN FISIKA February Edition
Publisher : Departement of Physics Faculty of Mathematics and Natural Sciences, and Institute of Research and Community Services Udayana University, Kampus Bukit Jimbaran Badung Bali

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.24843/BF.2023.v24.i01.p09

Abstract

The research on DSSC fabrication has been carried out using Hokianti micro leaf (carmona retusa) as an anthocyanin-based natural dye. DSSC is made using a TiO2 semiconductor coated on indium tin oxide (ITO) conductive glass with variations in the concentration of Hokianti micro leaf dye of 60, 75 and 90 mg/mL and variations in the color of the irradiation lamp on the DSSC, namely red, orange, green, blue and white. In this study, the results of characterization by FTIR spectrophotometer showed that the sample contained an aromatic ring functional group that acted as anthocyanin. Analysis with SEM showed that the surface morphology of the sample contained piles of grains with clear boundaries so that the grain diameter size could be obtained was approximately (54.13±0.62) µm. Characterization of sample dye using UV-Vis spectrophotometer at three concentrations of 60, 75 and 90 mg/mL absorbs light in the UV region, namely in the wavelength range of 200-400 nm with absorbance values of 0.4271, 0.4275 and 0.5449. The maximum absorbance value occurs at a concentration of 90 mg/mL, which is 0.5449. The results of characterization I-V showed that variations in the sample dye concentration of 60, 75 and 90 mg/mL affected the efficiency of DSSC with the highest efficiency values in red, orange, green, blue and white light colors, respectively 0.272%, 1.008%, 1.536%, 1.632% and 2.080%. The maximum efficiency value occurs at a concentration of 90 mg/mL illuminated by white light of 2.080%. Abstrak Telah dilakukan penelitian tentang fabrikasi DSSC menggunakan daun Hokianti mikro (carmona retusa) sebagai dye alami berbasis antosian. DSSC dibuat dengan menggunakan semikonduktor TiO2 yang dilapiskan pada kaca konduktif Indium Tin Oxide (ITO) dengan variasi konsentrasi dye daun Hokianti mikro sebesar 60, 75 dan 90 mg/mL dan variasi warna lampu penyinaran pada DSSC yaitu merah, orange, hijau, biru dan putih. Pada penelitian ini, hasil karakterisasi dengan spektofotometer FTIR menunjukkan bahwa sampel mengandung gugus fungsi cincin aromatik yang berperan sebagai antosianin. Analisis dengan SEM memperlihatkan morfologi permukaan sampel terdapat tumpukan butiran-butiran dengan batas-batas yang jelas sehingga dapat diperoleh ukuran diameter butiran sekitar (54,13±0,62)?m. Karakterisasi dye sampel dengan menggunakan spektrofotometer UV-Vis pada tiga konsentrasi 60, 75 dan 90 mg/mL menyerap cahaya pada daerah UV yaitu pada rentang panjang gelombang 200-400 nm dengan nilai absorbansi berturut-turut sebesar 0,4271, 0,4275 dan 0,5449. Nilai absorbansi maksimum terjadi pada konsentrasi 90 mg/mL yaitu sebesar 0,5449. Hasil karakterisasi I-V menunjukkan bahwa variasi konsentrasi dye sampel sebesar 60, 75 dan 90 mg/mL berpengaruh terhadap nilai efisiensi DSSC dengan nilai efisiensi tertinggi pada warna lampu merah, orange, hijau, biru dan putih berturut-turut 0,272%, 1,008%, 1,536%, 1,632% dan 2,080%. Nilai efisiensi maksimum terjadi pada konsentrasi 90 mg/mL yang disinari warna lampu putih sebesar 2,080%.
PERANCANGAN ALAT UKUR GAS HIDROKARBON (HC) DENGAN MENGGUNAKAN SENSOR MQ-4 BERBASIS MIKROKONTROLER AT89S52 I Nyoman Gede Putra Wibawa; I Wayan Supardi; I Gusti Agung Putra Adnyana
BULETIN FISIKA Vol 17 No 1 (2016): BULETIN FISIKA
Publisher : Departement of Physics Faculty of Mathematics and Natural Sciences, and Institute of Research and Community Services Udayana University, Kampus Bukit Jimbaran Badung Bali

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Abstract

It has been designed a hydrocarbon gas measuring instrument using the sensor MQ-4. Gas levels were detected by the sensor is processed for display on seven segment through several circuits, the sensor circuit, comparator circuit, non-inverting amplifier cicuit, ADC0804 circuit, the minimum system microcontroller AT89S52, and a circuit of seven segment multiplexing. The entire circuit is powered by a power supply 5 VDC, -15 VDC and +15VDC. The measurement range of measuring instruments is ranging from 0 ppm to 131 ppm. The workings of this measuring instrument utilizes the characteristics of the sensor MQ-4 that has a change of output voltage proportional to the change of gas levels were detected. Comparator circuit is used to adjust the sensor output voltage to be 0 volts when measured 0 ppm HC gas. Because the change of the output voltage is small, that is 2 mV, it would require 10 times voltage gain to make the changes of the output voltage can be converted into digital data by the ADC0804, then the conversion result is sent to microcontroller. The data received by microcontroller AT89S52, then processed into the output levels of the gas that displayed on seven segment. Compatibility between measuring instrument and reference instrument were obtained from linear regression analysis of data from test the measuring instrument that is equal to 99,9%.
Alat Monitoring Suhu Melalui Aplikasi Android Menggunakan Sensor LM35 dan Modul SIM800L Berbasis Mikrokontroler ATMega16 I Kadek Agus Sara Sawita; I Wayan Supardi; I Gusti Agung Putra Adnyana
BULETIN FISIKA Vol 18 No 2 (2017): BULETIN FISIKA
Publisher : Departement of Physics Faculty of Mathematics and Natural Sciences, and Institute of Research and Community Services Udayana University, Kampus Bukit Jimbaran Badung Bali

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Abstract

It has been successfully designed a temperature monitoring instrument through android application using LM35 sensor and SIM800L module based on ATMega16 microcontroller. The temperature is measured using a LM35 sensor which produces a voltage and sent to ADC. Microcontroller ATMega16 is using as the main processor of this monitoring instrument to calculate the program, so that analog data in the form of input voltage are converted into digital data form a measurable temperature. The measurable temperature is sent and saved in the database on the server computer using the SIM800L module so it can be displayed on the website. The website pages are accessed with android programs that installed on the smartphone so that measurable temperature data can be monitored using a smartphone. The measurable temperature results can be displayed on a 2x16-character LCD in the instrument designed. Compatibility of monitoring instrument with comparison instrument is 99,97 %.
Biosintesis Dan Karakterisasi Nanopartikel Perak Menggunakan Ekstrak Rimpang Rumput Teki (Cyperus rotundus L.) Rosvita Hilbrida Sulastri; I Wayan Supardi; Ni Nyoman Rupiasih; I Gde Antha Kasmawan; I Gusti Agung Putra Adnyana; I Nengah Sandi
BULETIN FISIKA Vol 25 No 1 (2024): BULETIN FISIKA February Edition
Publisher : Departement of Physics Faculty of Mathematics and Natural Sciences, and Institute of Research and Community Services Udayana University, Kampus Bukit Jimbaran Badung Bali

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.24843/BF.2024.V25.i01.p14

Abstract

Silver nanoparticles (AgNP) have been successfully synthesized using the rhizome extract of nutgrass (Cyperus rotundus L.). The method of synthesizing nanoparticles using biological materials, both microorganisms and plants, is called biosynthesis. The variation in the ratio of AgNO3 solution and nutgrass rhizome extract in units of µL and mL were 2:10, 5:10, 10:10, 15:10, 20:10, and 30:10, respectively. The process of forming silver nanoparticles was observed and characterized by UV-Vis spectrophotometer, FTIR, and SEM. The synthesis ratio that gives optimal result is 20 µL : 10 mL. The obtained silver nanoparticles have characteristic including Surface Plasmon Resonance (SPR) wavelength of 456.50 nm and random-shaped particles with an average size of 31-40 µm. The function groups formed include O-H with a peak around 3456.59 cm-1, a C-H group around 2391.93 cm-1, an O=C=O group stretching around 1155.41 cm-1, and the alkene group C=C bending with a peak at around 934.55 cm-1.
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