Jurnal Penelitian Fisika dan Aplikasinya (JPFA)
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).
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<![CDATA[SIMPLE EXPERIMENT OF DOPPLER EFFECT USING SMARTPHONE SENSOR ]]>
<![CDATA[Malik, Adam]]>;
<![CDATA[Mugiri, Widiastuti Ledgeriani]]>;
<![CDATA[Zakwandi, Rizki]]>;
<![CDATA[Safitri, Sani]]>;
<![CDATA[Juliani, Tia]]>
<![CDATA[ Jurnal Penelitian Fisika dan Aplikasinya (JPFA) Articles in Press ]]>
Publisher : <![CDATA[Universitas Negeri Surabaya ]]>
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DOI: 10.26740/jpfa.v10n1.p%p
<![CDATA[Doppler effect is physical phenomena which the emitted frequency is a source of change at a time when accepted by the detector due to relative movement of the detector towards the source of the wave or vice versa. In this research, conducted an activity measurement against Doppler effect symptoms by utilizing sensors found in smartphones. In this experiment, all mechanical instrument used is a smartphone with the help of software frequency sound generator, physics toolbox, the camera as an instrument of data collectors and software Tracker as motion analyzer. Based on the results of the experiment retrieved the value of the error and standard deviation of each of the observed symptoms. Symptoms affect Doppler upon source moving closer and away when the silent observer error value of 0.04% and% with a standard deviation of 0.1185 0.018 and 1.005. Experiment effect Doppler upon the source and observer approaching stationary gives error value of 8.60% and standard deviation 13.501 and to experiment the effect upon the source and Doppler observers moving each other approaching the error value of 4.31% and standard deviation of 0.087. Overall this experiment generates error value 3.267% and standard deviation of 3.665. So it could be inferred that the experiments conducted classified accurately and precision in effect phenomenon Doppler represents. Based on the results of this experiment the researcher recommends to carry out practical effects with the help of sensors Doppler smartphone.]]>
<![CDATA[IDENTIFICATION OF THE LOMBOK EARTHQUAKE SOURCE MECHANISM M_W 6.9 AND M_W 7.0 ON AUGUST 5 AND 9 2018 ]]>
<![CDATA[Priadi, Ramadhan]]>
<![CDATA[ Jurnal Penelitian Fisika dan Aplikasinya (JPFA) Vol 10, No 1 (2020): Articles in Press ]]>
Publisher : <![CDATA[Universitas Negeri Surabaya ]]>
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DOI: 10.26740/jpfa.v10n1.p%p
<![CDATA[Significant earthquakes with magnitudes ranging from M 5.8 to 7.0 occurred in Lombok in the period July to August 2018. 2 earthquake events occurred in a row namely 6.9 on August 5, 2018 (11:46:38 UTC) and 7.0 on August 9, 2018 (14:56:28 UTC). This phenomenon is very rare because earthquakes require a relatively long time to accumulate energy before being released. Based on the uniqueness, slip modeling is carried out in the fracture plane to determine the distribution of energy accumulation zones represented by asperity. Modeling is done by teleseismic body wave inversion at low frequencies. Modeling results show that the earthquake asperity zone of 6.9 is 0 km in strike direction and -18 km width in dip direction with a maximum slip of 1.3 m. While the results of earthquake modeling 7.0 the asperity zone is at -36 km in the strike direction and -7 km in the dip direction. The 7.0 earthquake shows the distribution of the dominant slip almost perpendicularly upward. The highest aspiration zone is in the up-dip portion of the earthquake hypocenter. These results indicate the earthquake slip vectors 6.9 pointing to the earthquake fault plane 7.0. Modeling results also indicate that a significant earthquake in Lombok does not have a single asperity, but is distributed in the fault plane. This is thought to be due to the condition of brittle rocks and enlargement that is limited by time and space.]]>
<![CDATA[THE SEGMENTATION OF NEUTRON DIGITAL RADIOGRAPHY IMAGE THROUGH THE EDGE DETECTION METHOD ]]>
<![CDATA[Amalia, Ayu Fitri]]>;
<![CDATA[Budhi, Widodo]]>
<![CDATA[ Jurnal Penelitian Fisika dan Aplikasinya (JPFA) Vol 10, No 1 (2020): Articles in Press ]]>
Publisher : <![CDATA[Universitas Negeri Surabaya ]]>
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DOI: 10.26740/jpfa.v10n1.p%p
<![CDATA[The digital image processing is one way to manipulate one or more digital images. Image segmentation has an essential role in the field of image analysis. The aim of this study was to develop an application to perform digital image processing of neutron digital radiographic images, hoping to improve the image quality of the digital images produced. The quality of edge detection could be used for the introduction of neutron digital radiographic image patterns through artificial intelligence. Interaction of neutrons with the matter mainly by nuclear reaction, elastic and inelastic scattering. A neutron can quickly enter into a nucleus of an atom and cause a reaction. It is because a neutron has no charge. Neutrons can be used for digital imaging due to high-resolution information from deep layers of the material. The attenuated neutron beam in neutron radiography are passing through the investigated object. The object in a uniform neutron beam is irradiated to obtain an image neutron. The technique used in segmenting the neutron radiography in this study was a digital technique using a camera with a charge-coupled device (CCD), which was deemed more efficient technique compared to the conventional one. Through this technique, images could be displayed directly on the monitor without going through the film washing process. Edge detection methods were implemented in the algorithm program. It was the first step to complement the image information where edges characterize object boundaries. It is useful for the process of segmenting and identifying objects in neutron digital radiography images. The edge detection method used in this study was Sobel, Prewitt, Canny, and Laplacian of Gaussian. According to the results of the image that have been tested for edge detection, the best image was carried out by the Canny operator because the method is more explicit. The obtained edges were more connected than the other methods which are still broken. The Canny provided edge gradient orientation which resulted in a proper localization.]]>
<![CDATA[THE SEGMENTATION OF NEUTRON DIGITAL RADIOGRAPHY IMAGE THROUGH THE EDGE DETECTION METHOD ]]>
<![CDATA[Amalia, Ayu Fitri]]>;
<![CDATA[Budhi, Widodo]]>
<![CDATA[ Jurnal Penelitian Fisika dan Aplikasinya (JPFA) Vol 10, No 1 (2020): Articles in Press ]]>
Publisher : <![CDATA[Universitas Negeri Surabaya ]]>
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DOI: 10.26740/jpfa.v10n1.p%p
<![CDATA[The digital image processing is one way to manipulate one or more digital images. Image segmentation has an essential role in the field of image analysis. The aim of this study was to develop an application to perform digital image processing of neutron digital radiographic images, hoping to improve the image quality of the digital images produced. The quality of edge detection could be used for the introduction of neutron digital radiographic image patterns through artificial intelligence. Interaction of neutrons with the matter mainly by nuclear reaction, elastic and inelastic scattering. A neutron can quickly enter into a nucleus of an atom and cause a reaction. It is because a neutron has no charge. Neutrons can be used for digital imaging due to high-resolution information from deep layers of the material. The attenuated neutron beam in neutron radiography are passing through the investigated object. The object in a uniform neutron beam is irradiated to obtain an image neutron. The technique used in segmenting the neutron radiography in this study was a digital technique using a camera with a charge-coupled device (CCD), which was deemed more efficient technique compared to the conventional one. Through this technique, images could be displayed directly on the monitor without going through the film washing process. Edge detection methods were implemented in the algorithm program. It was the first step to complement the image information where edges characterize object boundaries. It is useful for the process of segmenting and identifying objects in neutron digital radiography images. The edge detection method used in this study was Sobel, Prewitt, Canny, and Laplacian of Gaussian. According to the results of the image that have been tested for edge detection, the best image was carried out by the Canny operator because the method is more explicit. The obtained edges were more connected than the other methods which are still broken. The Canny provided edge gradient orientation which resulted in a proper localization.]]>
<![CDATA[IDENTIFICATION OF THE GRINDULU FAULT IN PACITAN, EAST JAVA USING MAGNETIC METHOD ]]>
<![CDATA[cholifah, latifatul]]>
<![CDATA[ Jurnal Penelitian Fisika dan Aplikasinya (JPFA) Vol 10, No 1 (2020): Articles in Press ]]>
Publisher : <![CDATA[Universitas Negeri Surabaya ]]>
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DOI: 10.26740/jpfa.v10n1.p%p
<![CDATA[Magnetic method in geophysical surveys is common for its non-destructive use of sub-surface structure delineation. In this study, ground-based measurements of magnetic intensity were performed using a set of instruments in some regions of Pacitan, a city in the southern area of East Java province. Based on these measurements, data acquisition was used to identify the Grindulu faulting zone in the region of interest, potentially vulnerable to geohazards. The data were first corrected using the IGRF and diurnal corrections. A filtering technique of upward continuation at a height of 900 m was then applied to separate local anomalies from regional ones as the targeted sources in the present case. These separate anomalies and their corresponding reductions to the poles as further filtering processes were analyzed for predicting the location and direction of the fault. The results, extracted from data analysis and interpretation, show that the main path of the Grindulu is directed along the NE-SW fault line or N60oE. The resulting anomalies also reflect that the Grindulu is a normal fault with surrounding minor faults lying across the Grindulu, calling for increased awareness of vulnerability in the city to seismic threats.]]>
<![CDATA[IDENTIFICATION OF THE GRINDULU FAULT IN PACITAN, EAST JAVA USING MAGNETIC METHOD ]]>
<![CDATA[cholifah, latifatul]]>
<![CDATA[ Jurnal Penelitian Fisika dan Aplikasinya (JPFA) Vol 10, No 1 (2020): Articles in Press ]]>
Publisher : <![CDATA[Universitas Negeri Surabaya ]]>
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DOI: 10.26740/jpfa.v10n1.p%p
<![CDATA[Magnetic method in geophysical surveys is common for its non-destructive use of sub-surface structure delineation. In this study, ground-based measurements of magnetic intensity were performed using a set of instruments in some regions of Pacitan, a city in the southern area of East Java province. Based on these measurements, data acquisition was used to identify the Grindulu faulting zone in the region of interest, potentially vulnerable to geohazards. The data were first corrected using the IGRF and diurnal corrections. A filtering technique of upward continuation at a height of 900 m was then applied to separate local anomalies from regional ones as the targeted sources in the present case. These separate anomalies and their corresponding reductions to the poles as further filtering processes were analyzed for predicting the location and direction of the fault. The results, extracted from data analysis and interpretation, show that the main path of the Grindulu is directed along the NE-SW fault line or N60oE. The resulting anomalies also reflect that the Grindulu is a normal fault with surrounding minor faults lying across the Grindulu, calling for increased awareness of vulnerability in the city to seismic threats.]]>
<![CDATA[CHARACTERIZATION OF TEMPERATURE RESPONSE OF ASYMMETRIC TAPERED-PLASTIC OPTICAL FIBER-MACH ZEHNDER INTERFEROMETER ]]>
<![CDATA[Yulianti, Ian]]>
<![CDATA[ Jurnal Penelitian Fisika dan Aplikasinya (JPFA) Vol 10, No 1 (2020): Articles in Press ]]>
Publisher : <![CDATA[Universitas Negeri Surabaya ]]>
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DOI: 10.26740/jpfa.v10n1.p%p
<![CDATA[Performance characterization of simple and low cost Mach Zehnder interferometer (MZI) using step index plastic optical fiber (SI-POF) to temperature variation is presented. The sensor consists of two tapers at several distance forming interferometer. The first taper was designed to be steep to allow excitation of cladding modes, while the second taper was gradual to supress power loss. Characterizations were done in terms of sensitivity, hysteresis and repeatability by analysing the output spectrums recorded by spectrometer at various environment temperature which are 35oC to 85oC with increment of 10oC. The results showed that the sensor has sensitivity of 0.0431 nm/oC and correlation coefficient of 0.9965. Hysteresis of 6.9×10-3was observed. In terms of repeatability, the sensor shows maximum deviation of ±3oC which was mainly resulted from fluctuation of oven temperature. Despite its high deviation, the sensor has advantages of simple fabrication process, low cost, robust and low power loss which make it as a good candidate for temperature sensor.]]>
<![CDATA[CHARACTERIZATION OF TEMPERATURE RESPONSE OF ASYMMETRIC TAPERED-PLASTIC OPTICAL FIBER-MACH ZEHNDER INTERFEROMETER ]]>
<![CDATA[Yulianti, Ian]]>
<![CDATA[ Jurnal Penelitian Fisika dan Aplikasinya (JPFA) Vol 10, No 1 (2020): Articles in Press ]]>
Publisher : <![CDATA[Universitas Negeri Surabaya ]]>
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DOI: 10.26740/jpfa.v10n1.p%p
<![CDATA[Performance characterization of simple and low cost Mach Zehnder interferometer (MZI) using step index plastic optical fiber (SI-POF) to temperature variation is presented. The sensor consists of two tapers at several distance forming interferometer. The first taper was designed to be steep to allow excitation of cladding modes, while the second taper was gradual to supress power loss. Characterizations were done in terms of sensitivity, hysteresis and repeatability by analysing the output spectrums recorded by spectrometer at various environment temperature which are 35oC to 85oC with increment of 10oC. The results showed that the sensor has sensitivity of 0.0431 nm/oC and correlation coefficient of 0.9965. Hysteresis of 6.9×10-3was observed. In terms of repeatability, the sensor shows maximum deviation of ±3oC which was mainly resulted from fluctuation of oven temperature. Despite its high deviation, the sensor has advantages of simple fabrication process, low cost, robust and low power loss which make it as a good candidate for temperature sensor.]]>
<![CDATA[An Exploration of Scientific Literacy on Physics Subjects within Phenomenon-based Experiential Learning ]]>
<![CDATA[Santhalia, Prima Warta]]>;
<![CDATA[Yuliati, Lia]]>
<![CDATA[ Jurnal Penelitian Fisika dan Aplikasinya (JPFA) 2021: Articles in Press ]]>
Publisher : <![CDATA[Universitas Negeri Surabaya ]]>
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DOI: 10.26740/jpfa.v11n1.p%p
<![CDATA[Scientific literacy is the ability to involve yourself in problems related to science. This research aims to explore the effect of phenomenon-based experiential learning on students' scientific literacy on expansion concept. This research was conducted with a mix-method approach with embedded experimental model design. The sample of this research was 32 students of grade 9 of a Senior High School in Malang, East Java, Indonesia. The data were collected through a scientific literacy tests (r = 0.53) and open-ended questions interviews to all the students, then be analyzed by using the Mann Whitney U-Test quantitatively and by using the Bybee (1997) assessment rubric qualitatively. Based on the results, it was found that the majority of students experienced an increase in their scientific literacy from the SI category (96.88%) into CSL (46.88). Future studies are expected to explore students' scientific literacy on other topics of physics education and utilize appropriate models in order to improve students' scientific literacy.]]>
<![CDATA[Correlation Of Science Process Skills On Critical Thinking Skills In Junior High School In Jambi City ]]>
<![CDATA[Maison, Maison]]>;
<![CDATA[Darmaji, Darmaji]]>;
<![CDATA[Kurniawan, Dwi Agus]]>;
<![CDATA[Astalini, Astalini]]>;
<![CDATA[Kuswanto, Kuswanto]]>;
<![CDATA[Ningsi, Aziza Putri]]>
<![CDATA[ Jurnal Penelitian Fisika dan Aplikasinya (JPFA) 2021: Articles in Press ]]>
Publisher : <![CDATA[Universitas Negeri Surabaya ]]>
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DOI: 10.26740/jpfa.v11n1.p%p
<![CDATA[Teachers need to know how science process skills and students' critical thinking skills are. This study aims to see the relationship between science process skills and critical thinking skills so that teachers can determine the appropriate learning methods to improve science process skills and critical thinking skills. The sample used by the researcher was class IX junior high school Adhyaksa 1 Jambi City, which amounted to 58 students. The sampling technique in this study using cluster sampling. The research design used in this study is an associative quantitative research method with a correlational research design. Quantitative analysis uses the SPSS program to find descriptive, normality tests, linearity tests, and correlation tests. The results showed that the significance value obtained was less than 0.05. It was seen that there was a relationship between students 'process skills and students' critical thinking abilities.]]>
