Journal of Physics and Its Applications
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.
Articles
92 Documents
<![CDATA[Generation of monocycle efficient terahertz pulses by optical rectification in LiNBO3 at 800 nm ]]>
<![CDATA[Ali Khumaeni]]>;
<![CDATA[Hideaki Kitahara,]]>;
<![CDATA[Takashi Furuya]]>;
<![CDATA[Kohji Yamamoto]]>;
<![CDATA[Masahiko Tani]]>
<![CDATA[ Journal of Physics and Its Applications Vol 1, No 1 (2018): November 2018 ]]>
Publisher : <![CDATA[Diponegoro University Semarang Indonesia ]]>
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DOI: 10.14710/jpa.v1i1.3912
<![CDATA[Generation of efficient terahertz (THz) pulses was experimentally made by tilted pump pulse front scheme with a Mg-doped LiNbO3 crystal. In this study, a spitfire laser (Ti:sapphire laser, 800 nm, 3 mJ, 1 kHz) was used as an optical source for the generation and detection of THz pulses. The electro-optic (EO) detection optics consisting of a ZnTe crystal (1 mm in thickness) and a balanced photodetector was used. To obtain optimum THz characteristics and pump to THz power conversion efficiency, the image of the grating was made coincides with the tilted pump pulse front. The maximum THz electric field of 8.5 kV/cm and the frequency bandwidth of 2.5 THz were achieved by using pump pulse energy of 2.4 mJ and pump pulse width of 100 fs. The THz energy of 4.15 μJ was obtained and pump-to-THz conversion efficiency was estimated to be approximately 1.73 x 10-3.]]>
<![CDATA[Synthesis of Zn-Fe nanoparticles using pulse laser ablation as a contrast agent in magnetic resonance imaging ]]>
<![CDATA[Nurul Hikmantiyah]]>;
<![CDATA[Eko Hidayanto]]>;
<![CDATA[Ali Khumaeni]]>
<![CDATA[ Journal of Physics and Its Applications Vol 2, No 1 (2019): November 2019 ]]>
Publisher : <![CDATA[Diponegoro University Semarang Indonesia ]]>
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DOI: 10.14710/jpa.v2i1.6458
<![CDATA[Synthesis of zinc oxide nanoparticles, iron oxide nanoparticles and Zn-Fe nanoparticles using pulse laser ablation method has been conducted. Experimentally, a pulse Nd:YAG laser (1064 nm, 7 ns, 35 mJ) was directed and focused on a metal plates of pure Zn and Fe, which are placed in the liquid medium of polyvinyl pyrrolidone (PVP). The PVP functions as a stabilizer agent. The results show that the produced nanoparticles have a spherical shape with an averaged diameter of Zn-Fe nanoparticles of 13 nm. FTIR and XRD test results of Zn-Fe nanoparticles show characteristics of Zn-Fe compounds. The examination of Zn-Fe nanoparticles as MRI contrast agents was carried out by varying the concentration of nanoparticles. Cenh calculation results showed the highest contrast enhancement occurred at a concentration of 1.25 mM with a value of 64.26% for T1 weighted images, and 81.52% for T2 weighted images. The SNR calculation results show the highest value at a concentration of 1.25 mM of 70.52 for T1 weighted images. The highest SNR value in the T2 weighted image at a concentration of 0.156 mM of 165.09.]]>
<![CDATA[The Electric Susceptibility of Bi-Layers Ferroelectrics ]]>
<![CDATA[Vincensius Gunawan]]>;
<![CDATA[Ngurah Ayu Ketut Umiati]]>;
<![CDATA[Agus Subagio]]>
<![CDATA[ Journal of Physics and Its Applications Vol 1, No 2 (2019): May 2019 ]]>
Publisher : <![CDATA[Diponegoro University Semarang Indonesia ]]>
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DOI: 10.14710/jpa.v1i2.4860
<![CDATA[In order to enhance insight of layered structure, we perform numerical calculation to obtain the dynamic electric susceptibility in bi-layers ferroelectrics. Since susceptibility is a parameter which gives response to the external field, then determination of this parameter is important. A lattice model is employed to slice bilayer structure into several lattices. Then, Landau-Khalatnikov equation of motion is used in each lattice to construct a matrix equation of equation of motion. The solution is obtained by applying entire-cell effective medium. We find that the homogeneity of dynamic polarization is different from homogeneity of the single individual layer due to the existence of interlayer interaction. As a result, the electric susceptibility is also altered. It is also noticed that there is a relation between the homogeneity of dynamic polarization and the value of electric susceptibility near resonant frequency. The higher the homogeneity, the bigger the values of susceptibility will be. ]]>
<![CDATA[Evaluation and Implementation of Otsu and Active Contour Segmentation in Contrast-Enhanced Cardiac CT Images ]]>
<![CDATA[Arvi Razanata]]>;
<![CDATA[Prawito Prajitno]]>;
<![CDATA[Djarwani Soeharso Soejoko]]>
<![CDATA[ Journal of Physics and Its Applications Vol 3, No 2 (2021): May 2021 ]]>
Publisher : <![CDATA[Diponegoro University Semarang Indonesia ]]>
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DOI: 10.14710/jpa.v3i2.10712
<![CDATA[The CT cardiac acquisition process is usually conducted by using an additional image with contrast medium that is injected inside the body and reconstructed by a radiologist using an integrated CT Scan software with the aim to find the morphology and volume dimension of the heart and coronary arteries. In fact, the data obtained from the hospital are raw data without segmented contour from a radiologist. For the purpose of automation, dataset is needed to be used as input data for further program development. This study is focused on the evaluation of the segmentation results of CT cardiac images using Otsu threshold and active contour algorithm with the aim to make a dataset for the heart volume quantification that can be used interactively as an alternative to integrated CT scan software. 2D contrast enhanced cardiac CT from 6 patients using image processing techniques was run on Matlab software. Of the 689 slices that was used, as many as (73.75 ± 19.41)%of CT cardiac slices have been segmented properly, (19.15 ± 19.61)%of the slices that were segmented included the spine bone, (1.36 ± 0.98)%of the slices did not include all region of the heart, (16.58 ± 15.26)%of the slices included other organs with the consistency from the measurement proven from inter-observer variability to produce r = 0,9941.The result is due to the geometry influence from the diameter of the patient’s body thickness that tends to be thin.]]>
<![CDATA[Photoluminescence effect on phosphorous irradiated zinc oxide (ZnO) nanotetrapods synthesized by simple thermal oxidation method ]]>
<![CDATA[Bushra Aziz]]>;
<![CDATA[Abdul Majid]]>;
<![CDATA[lubna ghani]]>;
<![CDATA[Iffat Aziz]]>
<![CDATA[ Journal of Physics and Its Applications Vol 3, No 1 (2020): November 2020 ]]>
Publisher : <![CDATA[Diponegoro University Semarang Indonesia ]]>
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DOI: 10.14710/jpa.v3i1.8271
<![CDATA[The irradiation effect on ZnO tetrapods was studied by Pelletron Tandem Accelerator at room temperature. ZnO tetrapods were synthesized by a simple thermal oxidation method by the vapors solid mechanism. The tetrapods were irradiated by phosphorous ion beam at different doses (1x1014, 5x1014, 1x1015, 2.5x1015, and 5x1015 ions/cm2) having irradiation energy of 1MeV. After irradiation, these samples were characterized by scanning electron microscope (SEM), photoluminescence (PL), and energy dispersive spectrum (EDS). Photoluminescence (PL) spectra of our samples show that near band emission and deep level emission peaks increases with increasing dose and these emission peaks are defects related peaks. The PL spectra showed that the emission at 3.31eV and 3.26 eV attributed to a conduction band of phosphorus-related acceptor transition and a donor to the acceptor pair transition, respectively. ]]>
<![CDATA[Identification of Landslide with Resistivity Method at Candi Industrial Area, Ngaliyan, Semarang ]]>
<![CDATA[Nuriyana Muthia Sani]]>;
<![CDATA[Agus Setyawan]]>;
<![CDATA[Rahmat Gernowo]]>
<![CDATA[ Journal of Physics and Its Applications Vol 3, No 2 (2021): May 2021 ]]>
Publisher : <![CDATA[Diponegoro University Semarang Indonesia ]]>
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DOI: 10.14710/jpa.v3i2.10674
<![CDATA[Landslides can be occurred in almost every natural slope or artificial slope slowly or suddenly with or without any prior signs. The main reason for slope collapse is the increase in shear stress in the landslide, the decrease in shear strength, or both. Landslide problems can result in loss of life and property, damage to the environment, infrastructure, public facilities, and disrupt livelihood generally. Landslides can be detected by exploration of the subsurface. The geoelectrical method is one of the geophysical methods to know the change of resistance of a type of rock layer below ground level. The research aims to interpret the lithology of the subsurface in the Candi Industrial Area, Ngaliyan, Semarang using Schlumberger configuration. The results of measurements are voltage and electric current to calculate the apparent resistivity value processed by IP2Win software to determine the lithology and the slip surface area. The results present that lithology in the research area consists of sand clay, clay, and sandstone. The results showed that the locations of landslide-prone areas lie at the contact between sand clay and clay with that area at a depth of between 19.95 – 31.62 m there is one difference in the resistivity value which can be assumed to be a slip surface.The result of the research can be used to make policy rules of landslide mitigation.]]>
<![CDATA[Data validation of gravity field and satellite data using correlation and coherence method ]]>
<![CDATA[rina dwi indriana]]>;
<![CDATA[M. Irham Nurwidyanto]]>;
<![CDATA[Laode M. Sabri]]>
<![CDATA[ Journal of Physics and Its Applications Vol 3, No 1 (2020): November 2020 ]]>
Publisher : <![CDATA[Diponegoro University Semarang Indonesia ]]>
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DOI: 10.14710/jpa.v3i1.9291
<![CDATA[Satellite data is frequently used as an initial study of a research area for its easy to access feature as well as its improving quality. One of the available satellite data is geopotential data. Satellite data is commonly used to be correlated to the topography data. In this research, satellite data is used as the database of validation in a research area. Valid measuring data is highly required, so that the qualified data is obtained for further process. To identify the validity, additional other QC is required than the existing QC which in 1D. The validation method which applied are correlation and coherence method. The distribution of correlation and coherence values show asimilirity or compatibility of field data with satellite data. The correlation method was calculate in 2D and the coherence in 1D. Correlation calculation of field data produces high correlation and coherence value to satellite data as much as 0.7 to 0.95 so that it could be identified that acquisition and data processing have been carried out correctly.]]>
<![CDATA[Characterization of Landslide geometry using Seismic Refraction Tomography in the GayoLues, Indonesia ]]>
<![CDATA[Muzakir Zainal]]>;
<![CDATA[Badrul Munir]]>;
<![CDATA[Marwan Marwan]]>;
<![CDATA[Muhammad Yanis]]>;
<![CDATA[Akmal Muhni]]>
<![CDATA[ Journal of Physics and Its Applications Vol 3, No 2 (2021): May 2021 ]]>
Publisher : <![CDATA[Diponegoro University Semarang Indonesia ]]>
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DOI: 10.14710/jpa.v3i2.10601
<![CDATA[Landslides are the most common geological phenomenon in Indonesia.The event is damage to public infrastructure, and fatalities was a big impact. Therefore, mapping the geometry of landslides is a part of the mitigation effort possible by geophysical methods. In this research, we applied seismic refraction tomography (SRT) to study the geometry of the sliding zone from the landslide event.TheNational Disaster Management Authority reported that the area was frequently occurring landslide disaster, i.e. 2018, 2019 and 2020 which caused the public infrastructure and obstructed the road access from the central to the west of Aceh. The SRT was measured in two profileslong the road.Data measurements were conducted on the side of the Babahrot - GayoLues road section that had experienced landslides.Measurements were made using the Seismograph PASI 16S24-P and 24 geophones to obtain a 92-meterlong profile with 2 meter spacing between the geophones. P-wave velocity data modeling is done using ZondST2D software.The results of modeling profiles 1 and 2 describe three different subsurface layers.The SRT profile 1 model consists of slate (0.2 - 0.7 km/s), clay (0.8 - 1.3 km/s), and sandy clay (1.4 - 1.9 km/s).While, the model of profile 2 consists of slate (0.5 - 1.0 km/s), clay (1.1 - 1.6 km/ s), and sandy clay (1.7 - 2.5 km/s).The contrasting wave velocity model shows that the SRT method can be used in landslide studies as a reference in determining the mechanism of the landslide system.]]>
<![CDATA[Dose Distribution 6 MV of X-Ray Photon Beam over Cerium Oxide Nanoparticles Solution ]]>
<![CDATA[Iis Nurhasanah]]>;
<![CDATA[Hella Arofah]]>;
<![CDATA[Agus Subagio]]>;
<![CDATA[Eko Hidayanto]]>;
<![CDATA[Tri Windarti]]>
<![CDATA[ Journal of Physics and Its Applications Vol 3, No 1 (2020): November 2020 ]]>
Publisher : <![CDATA[Diponegoro University Semarang Indonesia ]]>
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DOI: 10.14710/jpa.v3i1.9316
<![CDATA[CeO2 nanoparticles are biomaterial that demonstrate potential as antioxidant and radioprotector for medical application. In this study, the radioprotector properties of CeO2 nanoparticles was evaluated by measuring absorbed dose of X-ray radiation. CeO2 nanoparticles were synthesized by precipitation and characterized using UV-Vis and FTIR spectrometers. CeO2 nanoparticle solution was prepared with various concentrations from 0.005 mg/mL to 0.06 mg/mL. The solution was exposed to 6 MV X-ray photon beam from medical linear acceleration with a source-to-surface distance of 100 cm and radiation dose of 2 Gy. The absorbed dose of X-ray by CeO2 nanoparticle solution was measured by an ion chamber detector. The absorbance peak at 301 nm observed in UV-Vis spectrum and absorbance peak at 854 and 492 cm-1 in the FTIR spectrum confirmed the formation of CeO2 nanoparticles. Radiation dose measurement exhibited dose reduction of CeO2 nanoparticles solution depend on concentration. CeO2 nanoparticle solution with concentration higher than 0.04 mg/mL showed potential application for radioprotector 6 MV of X-ray photon beam.]]>
<![CDATA[Comparison of I-V Curves Between the Experiment of Corona Discharge on Gradient Line-To-Plane (GL-P) Configuration and The Mathematical Approach ]]>
<![CDATA[Susilo Hadi]]>;
<![CDATA[Asep Yoyo Wardaya]]>;
<![CDATA[Zaenul Muhlisin]]>;
<![CDATA[Jatmiko Endro Suseno]]>;
<![CDATA[Pandji Triadyaksa]]>;
<![CDATA[Ali Khumaeni]]>;
<![CDATA[Muhammad Nur]]>
<![CDATA[ Journal of Physics and Its Applications Vol 3, No 2 (2021): May 2021 ]]>
Publisher : <![CDATA[Diponegoro University Semarang Indonesia ]]>
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DOI: 10.14710/jpa.v3i2.10491
<![CDATA[Research has been conducted on the comparison of the I-V characteristic curve between mathematical study and experiment of the generation of negative DC corona discharge in the Gradient Line-to-Plane (GL-P) electrode configuration. The reason for this research is to calculate the suitability of the corona discharge electrical current between the mathematical and experimental study. The active electrode used has length 2 cm and height 4 cm. This research is conducted with variations in the sharpness angle of the active electrode (θ) 300, 450, and 600 and variations in the distance between the electrodes () 2 cm, 3 cm, and 4 cm. The mathematical formulation of the value of the corona discharge electrical current in the configuration of the GL-P electrode is obtained by using the geometric concept approach, which is the formulation of the capacitance value of the ordinary electrical circuit, with the addition of the multiplication factor value k in the sharp area of the active electrode, because in that area the greatest plasma flow distance is obtained. The value of the multiplication factor is obtained by fitting the curve between mathematical study and experiments. The I-V curve between the mathematical study and the corona discharge generation experiment has a high degree of similarity with the smallest percentage contacting point of 37.50%.The value of the multiplication factor is influenced by the sharpness angle of the active electrode shape and the distance between the electrodes.]]>
