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Utama Alan Deta
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Jurnal Penelitian Fisika dan Aplikasinya (JPFA)
Published by Universitas Negeri Surabaya
ISSN : 20879946     EISSN : 24771775     DOI : https://doi.org/10.26740/jpfa
Core Subject : Science, Education,
Astronomy Earth & Planetary Sciences Education Materials Science & Nanotechnology Physics
Jurnal Penelitian Fisika dan Aplikasinya (JPFA) is available for free (open access) to all readers. The articles in JPFA include developments and researches in Physics Education, Classical Physics, and Modern Physics (theoretical studies, experiments, and its applications), including: Physics Education (Innovation of Physics Learning, Assessment and Evaluation in Physics, Media of Physics, Conception and Misconceptions in Physics, hysics Philosophy anPd Curriculum, and Psychology in Physics Education); Instrumentation Physics and Measurement (Sensor System, Control System, Biomedical Engineering, Nuclear Instrumentation); Materials Science (Synthesis and Characteristic Techniques, Advanced Materials, Low Temperature Physics, and Exotic Material); Theoretical and Computational Physics (High Energy Physics, Gravitation and Cosmology, Astrophysics, Nuclear and Particle Phenomenology, and Computational and Non-Linear Physics); and Earth Sciences (Geophysics and Astronomy).
Arjuna Subject : Fisika dan Astronomi - Fisika dan Astronomi (Lain-Lain)
Articles 437 Documents
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INCREASING STUDENTS’ RESPONSIBILITY AND SCIENTIFIC CREATIVITY THROUGH CREATIVE RESPONSIBILITY BASED LEARNING Suyidno, Suyidno; Susilowati, Eko; Arifuddin, Muhammad; Misbah, Misbah; Sunarti, Titin; Dwikoranto, Dwikoranto
Jurnal Penelitian Fisika dan Aplikasinya (JPFA) Vol 9, No 2 (2019)
Publisher : Universitas Negeri Surabaya

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.26740/jpfa.v9n2.p147-157

Abstract

Scientific creativity and responsibility are believed to be key factors for overcoming increasingly complex real-life problems faced by students; but both competencies are not trained in school. Therefore, this research aims to describe the effectiveness of creative responsibility based learning (CRBL) to increase student?s responsibility and scientific creativity on physics learning in senior high school. This research used one group pretest-posttest design involving 66 students of two senior high schools in Banjarmasin, South Kalimantan, Indonesia. The data collection was conducted by using responsibility observation emphasizing on participatory, cooperation, delivering an opinion, and leadership. Additionally, data were gained through scientific creativity test emphasizing on problem finding, product improvement, scientific imagination, scientific problem solving, and creative product design. The data analysis was done through qualitative descriptive, n-gain, and paired t-test. The results showed      (1) student?s responsibility for each meeting is in good criteria, and (2) there is a significant increase on students? scientific creativity at ? = 5 %, with n-gain constitutes moderate category. Thus, the CRBL is believed to be effective to increase student?s responsibility and scientific creativity in physics learning
OPTICAL PROPERTIES COMPARISON OF CARBON NANODOTS SYNTHESIZED FROM KANGKUNG (IPOMOEA AQUATICA) WITH DEEP FRYING AND ROASTING TECHNIQUES Dwandaru, Wipsar Sunu Brams; Fauzi, Fika; Sari, Dyah Silviana; Sari, Emi Kurnia; Santoso, Iman; Suhendar, Haris
Jurnal Penelitian Fisika dan Aplikasinya (JPFA) Vol 9, No 2 (2019)
Publisher : Universitas Negeri Surabaya

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.26740/jpfa.v9n2.p123-131

Abstract

Carbon nanodots (Cdots) have many unique properties such as luminescence that can be utilized in various fields. The purposes of this study are to synthesize Cdots from kangkung (Ipomoea aquatica) through frying and roasting techniques and compare the optical properties of the Cdots using UV-Vis, PL, and FTIR. Three stages of synthesizing process of Cdots, i.e.: preparing the kangkung powder (root, stem, leaf) and synthesizing the Cdots through frying and roasting techniques. Each part (root, stem, and leaf) was heated in an oven at 250 oC for 2 hours and mashed into powder. The frying method was done by frying 15 g of the powder in 120 ml oil for 5 minutes at 88 oC, filtered, and dissolved in n-hexane. In addition, the roasting method was done by frying the powder without oil as much as 15 g for 5 minutes, dissolved in 120 ml of distilled water, and then filtered. The UV-Vis characterization showed one absorbance peak for Cdots via frying and roasting techniques at 293 nm to 296 nm and 262 nm to 282 nm, respectively. The Cdots through frying and roasting techniques produce red and green luminescence, respectively. The FTIR characterization showed the presence of C=C and C=O functional groups, which are the core and surface state of the Cdots by frying technique, while the samples via roasting technique showed only the core. It can be concluded that the Cdots samples obtained from frying and roasting methods have different optical properties. The frying method produces Cdots with longer wavelength at the absorbance peak in the UV-Vis test compared to the roasting method. Moreover, the frying and roasting methods produce different color luminescence.
THE RATE OF LAND COVER CHANGE USING LANDSAT DATA IN COAL MINING AREA OF SAWAH LUNTO CITY, INDONESIA Cahyono, Bowo Eko; Frahma, Yazella Feni; Nugroho, Agung Tjahjo
Jurnal Penelitian Fisika dan Aplikasinya (JPFA) Vol 9, No 2 (2019)
Publisher : Universitas Negeri Surabaya

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.26740/jpfa.v9n2.p189-203

Abstract

Sawahlunto city is well-known for coal mining region. As in 2010, there have been at least 12 mining companies exploring coal resources in the region. As time passes, land cover conditions have gradually decreased due to mining activities. This region on which was originally covered by various vegetation and ecosystem have systematically transformed into open areas for coal mining. The use of remote sensing technology for land cover monitoring has been commonly well-developed in accordance with the need for improvement of detailed information about the changes of land use coverage. This study examines the land cover changes using supervised classification method based on Landsat data. The method focuses on four dominant classes of land cover in the region, namely forest, mining, settlement, and water resources. The classification processes were performed based on true-color composite satellite images. The results show that the overall accuracies of classification are 91.68 %, 92.49 %, 93.69 %, and 93.74 % in 2000, 2006, 2011, and 2016 respectively. It was also found that forest is the largest area in the coal mining area which, in some sense, tends to continuously decrease in terms of land cover in the last 15 years. The rate of forest area degradation achieved its maximum between 2006 and 2011.
AUTOMATED UNIVERSAL IMAGE QUALITY INDEX MEASUREMENT VS. AUTOMATED NOISE MEASUREMENT: WHICH METHOD IS BETTER TO DEFINE CT IMAGE QUALITY? Lestari, Fauzia Puspa; Anam, Choirul; Hardiyanti, Yati; Haryanto, Freddy
Jurnal Penelitian Fisika dan Aplikasinya (JPFA) Vol 9, No 2 (2019)
Publisher : Universitas Negeri Surabaya

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.26740/jpfa.v9n2.p132-139

Abstract

Automatitation method in defining the quality of CT image is needed to optimize CT Scan treatment planning. So, the optimization of treatment planning can also be done automatically. There are various methods proposed to define the quality of an image. The purpose of this study was to find the simple and precision method to define CT image. We compared the performance of Automated Noise Measurement (ANM) and Automated Universal Image Quality Index (UIQI). We also compared them with the Manual noise measurement method based on the level of convergence in homogeneous images. The first step of Automated Noise Measurement was to create binary density slice using threshold values. Then, a masked image was performed by masking the original image and binary image. The standard deviation of every pixel for a certain kernel size was calculated by using a sliding window operation. The fourth step was to make a noise histogram from the noise map and determine the final noise in the image as the histogram peak. Then this calculation was normalized by the peak of the Hounsfield Unit (HU) histogram. All these steps were done with various kernel sizes for different slices in-homogenous phantom. In the Automatic UIQI method, the steps in the ANM method are carried out until the masked image stage, then UIQI is calculated for the masked image. The results show that automatic UIQI was more convergence in defining image quality than manual noise measurement and automated noise measurement by the lowest standard deviation which was only 0.00032867.
A SIMPLE MATRIX APPROACH TO DETERMINATION OF THE HELIUM ATOM ENERGIES Pingak, Redi Kristian; Kolmate, Rosara; Bernandus, Bernandus
Jurnal Penelitian Fisika dan Aplikasinya (JPFA) Vol 9, No 1 (2019)
Publisher : Universitas Negeri Surabaya

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.26740/jpfa.v9n1.p10-21

Abstract

Calculation of He atomic energy levels using the first order perturbation theory taught in the Basic Quantum Mechanics course has led to relatively large errors. To improve its accuracy, several methods have been developed but most of them are too complicated to be understood by undergraduate students. The purposes of this study are to apply a simple matrix method in calculating some of the lowest energy levels of He atom (1s2, triplet 1s2s, and singlet 1s2s states) and to reduce errors obtained from calculations using the standard perturbation theory. The convergence of solutions as a function of the number of bases is also examined. The calculation is done analytically for 3 bases and computationally with the number of bases using MATHEMATICA. First, the 2-electron wave function of the Helium atom is written as the multiplication of two He+ ion wave functions, which are then expanded into finite dimension bases. These bases are used to calculate the elements of the Hamiltonian matrix, which are then substituted back to the energy eigenvalue equation to determine the energy values of the system. Based on the calculation results, the error obtained for the He ground state energy using 3 bases is 2.51 %, smaller than the errors of the standard perturbation theory (5.28 %). Despite the fact that the error is still relatively large from the analytical calculations for singlet-triplet 1s2s energy splitting of He atom, this error is successfully reduced significantly as more bases were used in the numerical calculations. In particular, for n = 25, the current calculation error for all states is much smaller than the errors obtained from calculations using standard perturbation theory. In conclusion, the analytical calculations for the energy eigenvalue equation for the 3 lowest states of the Helium atom using 3 bases have been carried out. It was also found in this study that increasing the number of bases in our numerical calculations has significantly reduced the errors obtained from the analytical calculations.
STUDY PENGARUH SUHU DAN TEKANAN UDARA TERHADAP OPERASI PENERBANGAN DI BANDARA H.A.S. HANANJOEDDIN BULUH TUMBANG BELITUNG PERIODE 1980-2010 Fadholi, Akhmad
Jurnal Penelitian Fisika dan Aplikasinya (JPFA) Vol 3, No 1 (2013)
Publisher : Universitas Negeri Surabaya

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.26740/jpfa.v3n1.p1-10

Abstract

Dalam operasi penerbangan ada tiga tingkat (fase) yang sangat penting dan berhubungan dengan meteorology yaitu lepas landas (take off), penerbangan, dan mendarat (landing). Dalam hal ini sejumlah unsur meteorologi dapat berpengaruh terhadap kemampuan pesawat terbang pada saat-saat kritis. Diantara unsur yang dapat menunjang kelancaran ketiga fase di atas adalah suhu dan tekanan udara, dimana unsur cuaca tersebut harus dimengerti dan diperhitungkan yang selanjutnya akan menentukan kerapatan udaranya dan selanjutnya akan menentukan daya angkat pesawat terbang. Menggunakan metode regresi linier sederhana trend suhu maksimum tahun 1980-2010 di Bandara Hananjoeddin Belitung cenderung naik 1,17o dan tekanan udara cenderung turun 0,47oC. Menggunakan rumus density height didapatkan nilai terendah tahun 1988 sebesar 1878,39 feet dan tertinggi tahun 2006 sebesar 2118,22 feet. Hasil penelitian ini dipandang perlu untuk mengetahui mengenai pengaruh unsur cuaca khususnya bagi dunia penerbangan sehingga ICAO (International Civil Aviation Organization) membuat satuan standar yang diperuntukkan bagi pelayanan dan keselamatan penerbangan.
THE IMPROVEMENT OF STUDENTS’ SCIENTIFIC LITERACY THROUGH GUIDED INQUIRY LEARNING MODEL ON FLUID DYNAMICS TOPIC Arifin, Lina; Sunarti, Titin
Jurnal Penelitian Fisika dan Aplikasinya (JPFA) Vol 7, No 2 (2017)
Publisher : Universitas Negeri Surabaya

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.26740/jpfa.v7n2.p68-78

Abstract

This research was aimed to improve the students? scientific literacy through guided inquiry learning model on Fluid Dynamics material. The type of research was pre-experimental design with one group pre-test and post-test design that used 1 experimental class and 2 replication classes. The data analyzed was the learnig implementation, scientific literacy aspects, and students? responses. The result of this research shows that: (1) the implementation of guided inquiry learning model to improve students? scientific literacy was done well and in accordance with the learning syntax; (2) there was an increase in the scientific literacy of high category in competency aspect that was in the competency to interpret data and scientific evidence. In addition, in the other aspects that were procedural knowledge aspect, local context aspect, and attitude of science interest aspect; and (3) the students? responses showed very good category. The implementation of guided inquiry learning model can increase students? scientific literacy level.
STUDI PENGARUH ORIENTASI SERAT FIBER GLASS SEARAH DAN DUA ARAH SINGLE LAYER TERHADAP KEKUATAN TARIK BAHAN KOMPOSIT POLYPROPYLENE Munasir, M
Jurnal Penelitian Fisika dan Aplikasinya (JPFA) Vol 1, No 1 (2011)
Publisher : Universitas Negeri Surabaya

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.26740/jpfa.v1n1.p33-41

Abstract

Telah dilakukan fabrikasi dan uji kekuatan tarik bahan komposit Polypropylene (matrik) dengan Fiber Glass (sebagai penguat/filler) dengan perbandingan 95% dan 5% (matrix: filler), dengan filler tersusun secara singledirectional dan bidirectional dengan single layer. Massa keseluruhan dari sampel adalah 4 gram. Dari sampel yang sudah dibuat dilakukan uji kompaktibilitas untuk menetukan kekompakan ikatan antar muka antara matrik dan fillernya, dan juga dilakukan uji optimasi pemanasan untuk menentukan temperatur pembakaran yang paling optimum sehingga dihasilkan bahan komposit dengan sifat mekanik / kekuatan tarik terbesar. Berdasarkan uji kualitas ikatan antar muka atau kompaktibilitas komposit polypropylene dengan fiber Glass secara teoritis sudah terjadi kompaktibilitas antara kedua bahan tersebut sehingga membentuk bahan komposit, hal ini ditunjukan oleh grafik upper lower bond. Dan dari hasil uji kekuatan tarik diperoleh, kekuatan tarik terbesar terdapat pada bahan komposit dengan orientasi serat searah dibanding komposit tanpa serat (1,06:1) dan tanpa serat dibanding serat dua arah (1:0,87). Komposit dengan serat dua arah mempunyai kekuatan tarik terendah, hal ini disebabkan oleh arah serat yang tegak lurus dengan arah pembebanan akan memperlemah kekuatan tariknya, hal ini berkebalikan dengan nilai elogationnya yaitu orientasi serat dua arah mempunyai elongation yang lebih besar daripada serat searah. Selanjutnya disarankan untuk penelitian berikutnya, bahwa dalam pembuatan sampel uji diharapkan menggunakan alat yang dapat mengontrol suhu (stabil) dan dapat dilakukan untuk bahan komposit multilayer dengan perbedaan orientasi serat pada tiap lapisnya.
KAJIAN EKSPERIMENTAL EFISIENSI DAN KARAKTERISTIK PRODUKSI OZON BERDASARKAN VARIASI PANJANG DAN LAJU ALIR REAKTOR DIELECTRIC BARRIER DISCHARGE PLASMA (DBDP) BERBAHAN BAJA ANTI KARAT Suraidin, S; Nur, Muhammad
Jurnal Penelitian Fisika dan Aplikasinya (JPFA) Vol 6, No 1 (2016)
Publisher : Universitas Negeri Surabaya

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.26740/jpfa.v6n1.p18-25

Abstract

Penelitian ini membahas kajian reaktor ozon dengan dielectric barrier discharge plasma (DBDP): variasi panjang elektroda stainless steel. Konsentrasi ozon dihasilkan dengan melakukan variasi tegangan mulai dari 3-5 kV dan variasi laju alir dari 2, 3, 4, 5, 6, 8, sampai 10 L/menit. Reaktor ozon yang digunakan sebagai pembangkit ozon mempunyai konfigurasi kerangka silinder-silinder. Elektroda dalam (kerangka silinder) terbuat dari stainless stell, sedangkan elektroda luar (silinder) terbuat dari lempengan seng dan bahan dielektrik yang digunakan adalah pyrex. Reaktor diberi tegangan tinggi AC dengan frekuensi 16 kHz. Penelitian ini menggunakan lima variasi panjang reaktor ozon yaitu 5, 10, 15, 20, dan 25 cm. Untuk menentukan konsentrasi ozon pada setiap reaktor yang berbeda, maka ozon yang dihasilkan diserap dalam larutan KI selanjutnya dititrasi dengan natrium thiosulfat. Hasil penelitian menunjukan bahwa semakin panjang elektroda yang digunakan maka konsentrasi ozon yang dihasilkan semakin tinggi, yakni mulai dari 384 sampai dengan 634 ppm untuk laju alir 2 L/menit, sedangkan semakin besar laju alir gas oksigen maka konsetrasi yang dihasilkan semakin kecil, yakni mulai dari 624 sampai dengan 134.4 ppm untuk panjang reaktor 25 cm. Selain itu, semakin tinggi tegangan yang diberikan maka konsentrasi ozon akan semakin meningkat, yakni dengan tegangan 3 sampai 5 kV menghasilkan konsentrasi dari 480 sampai dengan 624 ppm.
ACKNOWLEDGMENT JPFA VOL 8 NO 1 JUNE 2018 JPFA, Editor
Jurnal Penelitian Fisika dan Aplikasinya (JPFA) Vol 8, No 1 (2018)
Publisher : Universitas Negeri Surabaya

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.26740/jpfa.v8n1.pvii

Abstract

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