cover
Article Per Year (5 Year)
All
Home Page
OAI Link
Editorial Team
Contact
Reviewer
Google Scholar
Contact Name
Ali Khumaeni
Contact Email
khumaeni@fisika.fsm.undip.ac.id
Phone
+62247474754
Journal Mail Official
jpa@live.undip.ac.id
Editorial Address
Department of Physics Faculty of Science and Mathematics Diponegoro University Jl Prof Soedharto SH, Tembalang, Semarang, Indonesia
Location
Kota semarang,
Jawa tengah
INDONESIA
Journal of Physics and Its Applications
Published by Universitas Diponegoro
ISSN : -     EISSN : 26225956     DOI : 10.14710
Core Subject : Science,
Astronomy Earth & Planetary Sciences Materials Science & Nanotechnology Physics
Journal of Physics and Its Applications (JPA) (e-ISSN: 2622-5956) is open access, International peer-reviewed journal that publishes high-novelty and original research papers and review papers in the field of physics including Radiation Physics, Materials, Geophysics, Theoretical Physics, Instrumentation and Electronics, Medical Physics, Biomedical Physics, Chemical Physics, Mathematical Physics, and Applied Physics. The JPA publishes two issues annually (May and November). The journal is published by Department of Physics, Faculty of Science and Mathematics, Diponegoro University, Indonesia.
Arjuna Subject : Fisika dan Astronomi - Fisika dan Astronomi (Lain-Lain)
Articles 83 Documents
 2   3   4   5   6 
Modeling of 3D Aquifer Layers using Poisson’s Ratio Analysis HVSR Method in Tembelang Village, Candimulyo District, Magelang Regency Achmad Syaifuddin Zuhri; Udi Harmoko; Gatot Yuliyanto
Journal of Physics and Its Applications Vol 3, No 1 (2020): November 2020
Publisher : Diponegoro University Semarang Indonesia

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.14710/jpa.v3i1.9389

Abstract

Water is one of vital needs for human beings. People use water to drink, bath, irrigate, and etc. Water supply has become a severe problem over the two past years especially in Tembelang Village, Candimulyo District, Magelang Regency. The research aims to determine the aquifer layers. The method used in this research is seismic method with HVSR (Horizontal to Vertical Spectral Ratio) microtremor survey with 71 measurement points. The HVSR microtremor data is processed to determine Poisson’s ratio from Vp⁄Vs  ratio. The obtained Vp⁄Vs  ratio from 71 measurement points ranges from 1.63 to 2.64 and Poisson's ratio ranges from 0.20 to 0.42. The Vp⁄Vs  ratio parameter to determine an aquifer is more than 1.73 and the Poisson's ratio is more than 0.25. There are 4 zones which are considered to have aquifers, namely at line 1 near point P22 depth of over 184 meters, line 2 near point P8 depth of 108-180 meters, line 3 near point P2 and P3 depth of 91-161 meters, line 4 near point P16, P17, and P18 depth of 32-187 meters. line 5 near point T22 depth of 63-157 meters, point T31 depth of 122-152 meters, and point T40 depth of 71-178 meters. The Vp⁄Vs  ratio and Poisson’s ratio are then modeled by using Rockwork 15 to obtain 3D models of acquifers based on the Vp⁄Vs  ratio and Poisson’s ratio.
Improving water absorption time and the natural silk strength (Bombyx Mori) using atmospheric dielectric barrier discharge plasma Zaenul Muhlisin; Muhammad Adrian Lathif; Fajar Arianto; Pandji Triadyaksa
Journal of Physics and Its Applications Vol 3, No 2 (2021): May 2021
Publisher : Diponegoro University Semarang Indonesia

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.14710/jpa.v3i2.10658

Abstract

This researchaimed to obtain Dielectric Barrier Discharge plasma discharge characteristics with and without the placement of natural silkBombyx Mori on one of the electrodes. Furthermore, the strength and the water absorption time of the irradiated silk samples will be analyzed.  Plasma discharge is generated by connecting electrodes of point-to-plane configuration with a sheet of glass inserted on the plane electrode at atmospheric conditions. The characterization of plasma discharge, either with or without the natural silk samples' placement on the plane electrode, was performed by increasing A.C.'s high voltage power source to reach arch discharge. Theelectrode spacing varied from 0.7 cm to 2.5 cm with a 0.3 cm increment. Sample irradiation was performed using cold plasma for 5, 15, and 30 minutes respectively. Placing or not placing the natural silk samples on the plane electrode will increase the plasma's discharge current and increase the high voltage. Moreover, increasing the distance between the electrodes and placing the sample on the plane electrode decreases the discharge current. Using Scanning Electron Microscopy, it was found that increasing plasma irradiation time on samples decreases the silk thread'sdiameterand shortening its water absorption time. The strength of irradiated fabric was reduceduntil 15 minutes of irradiation. However, at 30 minutes of irradiation, there was an increase in sample thickness compared to control samples.
Meridional variations of Sea Surface Temperature and Wind over Southern Sea of Java and Its Surroundings Iis Sofiati; Erma Yulihastin; Suaydhi Suaydhi; Muhammad Fadhlan Putranto
Journal of Physics and Its Applications Vol 3, No 1 (2020): November 2020
Publisher : Diponegoro University Semarang Indonesia

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.14710/jpa.v3i1.9374

Abstract

Sea surface temperature (SST) plays an important role in controlling the ocean’s heat content and regulating climate. The seasonal characteristics of SST and wind speed and their correlation in the southern Java are investigated using satellite observations. The method use in this study is averaging hourly into monthly data for SST and wind speed during 20 years observation for period of 2000-2019, and representing it in the form of descriptive monthly and seasonally. The detailed correlation research was focused on the (0-5)°S, (5-10)°S, and (10-15)°S. The results show that SST reached its peak in August, while wind speed reached its minimum in August. The difference in SST (wind speed) for climatological condition lower (higher) in MJJASO, and the magnitude is more fluctuating in latitude average rather than in NDJFMA. The significant results of the study describe meridional variation in SST and wind between the northern (Karimata Strait), central (Java Sea), and southern (Indian Ocean) regions. In this case, the Indian Ocean region near south of Java has the highest correlation between SST and wind for both of dry and rainy season compared to other areas.
Characteristics of colloid silver solution based on changes in concentration and electric field using electrooptic equipment Heri Sugito; Ketut Sofjan Firdausi; Ali Khumaeni; Syifa Azahra
Journal of Physics and Its Applications Vol 4, No 1 (2021): November 2021
Publisher : Diponegoro University Semarang Indonesia

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.14710/jpa.v4i1.12419

Abstract

Research on the characteristics of colloidal silver solutions based on changes in concentration and electric field using electrooptic devices has been carried out. The purposes of this study was to determine the characteristic of colloidal silver solution based on variations in concentration and electrooptic effects. Electrooptics work based on changes in the polarization angle of the sample. The sample used is a colloidal silver solution with various concentrations. The colloidal silver solution was obtained by laser ablation method and then dissolved in aquabidest. The light source used is a laser pointer with = 532 nm. The electric field applied to the sample is 0-9 kV. The results showed that colloidal silver solution at an angle of 0º showed active plasmon resonance at the peak of polarization with concentrations of 1.9 ppm, 2.28 ppm, and 3.8 ppm. An angle of 90º also shows active plasmon resonance at the peak of polarization with a concentration of 3.8 ppm. From the results, it can be concluded that the characteristics of colloidal silver solution on change in the polarization angle due to an electric field show non-linier properties with increasing concentration.
Optimization of linear taper design of a silicon-slab waveguide Wildan Panji Tresna; Umar Ali Ahmad; Alexander William Setiawan Putra
Journal of Physics and Its Applications Vol 4, No 1 (2021): November 2021
Publisher : Diponegoro University Semarang Indonesia

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.14710/jpa.v4i1.12495

Abstract

A linear taper is applied on a slab waveguide to control the divergence angle of the light. In this research, the slab waveguide design consists of silicon (Si) and SiO2 as the core and the substrate, respectively. The tapered design is optimized by measuring of Full-Width Half Maximum (FWHM) of the light after propagation in a Finite Different Time Domain (FDTD). The simulation results show that the optimized taper design is obtained when its length LT and width WL are 125 µm and 10 µm, respectively. This value is the optimal length to get the small diffraction angle of light during propagation in the waveguide. Thus, the divergence angle of the input light of the slab waveguide can be minimized by using this structure. One purpose of this research is to develop a miniaturized optical technology that is like the size of a chip.
Clustering of seismicity in the Indonesian Region for the 2018-2020 Period using the DBSCAN Algorithm Akrima Amalia; Udi Harmoko; Gatot Yuliyanto
Journal of Physics and Its Applications Vol 4, No 1 (2021): November 2021
Publisher : Diponegoro University Semarang Indonesia

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.14710/jpa.v4i1.11884

Abstract

Indonesia is located at the confluence of 3 large, active plates that are constantly moving. Therefore, Indonesia is one of the countries that has a high level of seismicity risk. This study aims to classify seismicity data in the Indonesian region based on coordinate data which contains variable data on frequency of occurrence, depth, and strength of seismicity. Seismicity data was obtained from the BMKG official website using data for the period 2018 to 2020. The clustering technique used was the DBSCAN algorithm. This algorithm requires epsilon and MinPts input parameters. The results of the cluster formed will then be validated using silhouette coefficients. Based on the coordinate data, 4 clusters were formed with 4 disturbances. Based on the characteristic data, 3 clusters were formed with 5 disturbances. The silhouette coefficient obtained was 0.35 for coordinate data and 0.39 for characteristic data. This research is useful for increasing the use value of abundant seismicity information and can be used as an effort to mitigate seismicity natural disasters.
Development of in-house phantoms from polyester resin and methyl ethyl ketone peroxide materials with various diameters:Investigation their CT numbers for various tube voltages and field of views Luthfi Nurrahma Shofiana; Choirul Anam; Heri Sutanto; Rin Hafsatul Asiah; Riski Nihayati; Ansory Khaerul; Geoff Dougherty
Journal of Physics and Its Applications Vol 4, No 1 (2021): November 2021
Publisher : Diponegoro University Semarang Indonesia

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.14710/jpa.v4i1.12254

Abstract

Development phantoms with various sizes reflecting the variation among patients to investigate the accuracy size-specific dose estimate (SSDE)is essential. The aim of this work was to develop in-house phantoms from polyester resin (PR) and methyl ethyl ketone peroxide (MEKP) for various diameters and investigate the CT numbers of the phantoms with various tube voltages and reconstructed field of views (FOV). In-house phantoms with diameters of 8, 16, 24, and 32 cm were developed. The phantoms were made from the PR and MEKP materials. The composition of MEKP was 0.3 wt% and PR was 99.7%. The phantoms were scanned with a Siemens SOMATOM Emotion 6 CT scanner with various tube voltage (i.e. 80, 110, and 130 kVp), and various field of views (FOVs) (i.e. 35, 40, 45, 50 cm). CT numbersof the phantoms for various diameters, tube voltages and FOVs were investigated. It was found that the CT number was in range of 86 HU to 147 HU. The CT number increased with the increases of diameter and tube voltage. However, the CT number was independent with the FOV. The in-house phantom based on PR andMEKP with various diameters from 8 cm to 32 cm have been successfully developed. The CT numbers of the phantoms depend on diameter and tube voltage,but do not depend with the FOV.
Layer deposition of titanium dioxide (TiO2) using DC-sputtering method with variation of deposition time: study of microstructure and coating hardness Uli Aprilia Mukaromah; Wiwien Andriyanti; Heri Sutanto; Nuha Nazilah Sahabudin
Journal of Physics and Its Applications Vol 4, No 1 (2021): November 2021
Publisher : Diponegoro University Semarang Indonesia

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.14710/jpa.v4i1.12331

Abstract

The A thin layer of titanium dioxidehas been deposited using the DC-Sputtering method at various time of deposition of 30 minutes, 60 minutes, 90 minutes, 120 minutes and 150 minutes. This study aims to grow a layer of TiO2 on the surface of stainless steel 316L with a certain time variation to determine the characterization of the microstructure, hardness, and properties of the coating to the water contact angle. The XRD test results show that the titanium dioxide (TiO2) thin layer has a TiO2-monoclinicstructure corresponding to the planes (133), (133), (220), (133) and (133), while the crystallite size can be determined using Debye-scherrer Equation were ~14.34318 nm, ~17.09422 nm, ~18.94568 nm, ~14.04389 nm, and ~7.90887 nm, respectively. The hardness value was obtained through the Vickers Hardness Test and it is known that the TiO2 layer can increase the hardness value by ~48.175% with a maximum hardness value of 170.105 VHN at a deposition time of 90 minutes. Observations from the contact angle test can be seen that the TiO2 layer is hydrophilic.
FOPDT Model Based on Experimental Data from Municipal Solid Waste Incineration Process Temperature Control in Fixed Bed Ainie Khuriati
Journal of Physics and Its Applications Vol 4, No 2 (2022): May 2022
Publisher : Diponegoro University Semarang Indonesia

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.14710/jpa.v4i2.12442

Abstract

Incineration is the waste combustion at controlled high temperatures which converts waste into flue gas with the main components being CO2 and water. Temperature control aims to ensure safe combustion operation. In this study, the temperature controller uses a two-position temperature controller whose main components include two thermocouples, MAX6675, two burners, blower, Arduino, and one laptop. Temperature controllers were used to maintain the temperature in the combustion chamber and afterburner at the specified setpoint, namely 630oC and 850oC, respectively.  To test the performance of the controller, two models were made. The modeling was made using the experimental data obtained. The results show that the model and experimental results are in good agreement.
The Mass Distribution of Soputan Volcano Based on Gravity Data Dave Emmanuel Haning; Agus Setyawan; Rina Dwi Indriana
Journal of Physics and Its Applications Vol 4, No 2 (2022): May 2022
Publisher : Diponegoro University Semarang Indonesia

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.14710/jpa.v4i2.13230

Abstract

The gravity method is a passive method based on the density measurement among sediment. This method is usually applied to identify the condition of the earth’s subsurface. Soputan Volcano is located in District Minahasa Tenggara. Soputan Volcano is included in type A Volcano or stratovolcano and it stands at 1783.7 MSL. This research aims to identify the distribution of subsurface mass (sediment density) of Soputan. The data used was Data from satellite GGmPlus and elevation data of ERTM which was corrected to ellipsoid reference. 3D inversion modeling applied Grablox software. The complete value of the Bouguer anomaly obtained was 110 – 162 mGal. The density result obtained from the inversion model was 2.3 g/cm3 to 2.95 g/cm3. The sediment that could be identified was andesite sediment and basalt sediment. Based on that result, the layer arranging Soputan Volcano consists of many variations of mass in each depth grouped into andesite, breccia, basalt, andesite-basaltic, lava, breccia, and tuff.

Page 4 of 9 | Total Record : 83

 2   3   4   5   6 

Filter by Year

2018 2025


Reset
Filter By Issues
All Issue Vol 7, No 3 (2025): August 2025 Vol 7, No 2 (2025): May 2025 Vol 7, No 1 (2024): November 2024 Vol 6, No 2 (2024): May 2024 Vol 6, No 1 (2023): November 2023 Vol 5, No 2 (2023): May 2023 Vol 5, No 1 (2022): November 2022 Vol 4, No 2 (2022): May 2022 Vol 4, No 1 (2021): November 2021 Vol 3, No 2 (2021): May 2021 Vol 3, No 1 (2020): November 2020 Vol 2, No 2 (2020): May 2020 Vol 2, No 1 (2019): November 2019 Vol 1, No 2 (2019): May 2019 Vol 1, No 1 (2018): November 2018 More Issue