Journal of Physics: Theories and Applications
Journal of Physics: Theories and Applications (cited as J. Phys.: Theor. Appl.) is a peer-reviewed and open access journal, which is published twice a year by Physics Department, Sebelas Maret University. The journal is designed to serve researchers, developers, professionals, graduate students and other interested in theoretical and applied physics.
Articles
64 Documents
<![CDATA[Measurement of Specific Heat of Organic Materials Using Non-Isolating Container and Arduino ]]>
<![CDATA[Erol, Mustafa]]>;
<![CDATA[Göl, Damla]]>
<![CDATA[ Journal of Physics: Theories and Applications Vol 7, No 2 (2023): Journal of Physics: Theories and Applications ]]>
Publisher : <![CDATA[Universitas Sebelas Maret ]]>
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DOI: 10.20961/jphystheor-appl.v7i2.78504
<![CDATA[This study reports a novel method for specific heat measurements of organic materials namely potaoes, quinces and radishes. The method proposed in this work is novel in the sense that it employs a non-isolated container and an Arduino microprocessors. The actual measurements are simply managed by placing the organic materials within hot water in a non-isolating container and by monitoring the temperature and time by means of Arduino UNO microprocessor. The heat leakage due to the non-isolated container is determined by using the heat versus time graph of the system and by mathematically modeling the temperature decrease by the time due to the heat exchange between the hot water and the environment. The measurements have revealed that the relative errors for the measurements are approximately % 4.75 for potatoes, % 21.50 for radishes and % 1.30 for quinces. The approach described in this work is inexpensive, very easy to apply and can potentially be beneficial for basic physics, science and engineering research activities.]]>
<![CDATA[Identification of sea breeze front (SBF) characteristics in the dry season using doppler weather radar on the west coast area of south Sulawesi ]]>
<![CDATA[Handayani, Nelly]]>;
<![CDATA[Rejeki, Hasti Amrih]]>
<![CDATA[ Journal of Physics: Theories and Applications Vol 7, No 2 (2023): Journal of Physics: Theories and Applications ]]>
Publisher : <![CDATA[Universitas Sebelas Maret ]]>
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DOI: 10.20961/jphystheor-appl.v7i2.70536
<![CDATA[Sea Breeze Front (SBF) is one of the important components of sea breeze circulation, which plays role in coastal area’s atmospheric dynamics. SBF causes significant changes in temperature and humidity profiles and initiates updrafts that induce convective activity. This study aims to determine the characteristics of SBF and its impact on convection activity using Doppler weather radar on the west coast area of South Sulawesi during dry season. SBF identification utilized PPI and CMAX products to detect convective clouds and SRI to estimate rainfall intensity, then verified it using Automatic Weather Station (AWS) and Automatic Rain Gauge (ARG). SBF was generally detected at 10.30–14.30 LT with an average moving speed of 2.04 m/s. The length of SBF ranges from 15.47–21.08 km and moves inland as far as 12.57–26.09 km with 0.51–0.89 km of column depth. There was a difference in the average value of solar radiation intensity up to 106 W/m2 and 0.5°C of temperature during SBF Days. SBF caused 17 events of convective activity with a maximum reflectivity value of 42–60 dBz and 4–8 km of cloud diameter. Five out of 17 convective activities indicated the occurrence of light rain on the surface.]]>
<![CDATA[Monitoring system ammonia concentration using fiber optic sensor based surface plasmon resonance ]]>
<![CDATA[Huda, Erin Ficrah]]>;
<![CDATA[Harmadi, Harmadi]]>;
<![CDATA[Muldarisnur, Muldarisnur]]>
<![CDATA[ Journal of Physics: Theories and Applications Vol 7, No 2 (2023): Journal of Physics: Theories and Applications ]]>
Publisher : <![CDATA[Universitas Sebelas Maret ]]>
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DOI: 10.20961/jphystheor-appl.v7i2.78897
<![CDATA[A monitoring system for ammonia concentration in waters has been created using fiber optic sensors based on surface plasmon resonance (SPR). Monitoring is carried out to measure the decline in water quality due to the toxic compound ammonia from floating net cages (KJA) activities used as aquaculture sites. The sensor performance was improved by replacing the cladding using gold nanoparticles to increase the sensitivity of the fiber optic sensor based on the SPR phenomenon. The sensor consists of a laser diode as a light source, optical fiber as a waveguide and OPT101 as a photodetector. The Arduino Nano microcontroller is used as a data processor, LoRa as a transmission system and the MCU node as a data receiver. The results of measuring the ammonia concentration received by the MCU node are displayed on a Google spreadsheet in real time. Testing of measuring instruments is carried out by comparing the measurement results with a UV-Vis spectrophotometer. The test results obtained an accuracy value of 94.09% for optical fibers using the dip coating method and 78% for optical fibers using the thermal evaporation coating method.]]>
<![CDATA[Impact of Nd2O3 on physical properties of lead borate glass system ]]>
<![CDATA[Marzuki, Ahmad]]>;
<![CDATA[Astuti, Retno Willy]]>;
<![CDATA[Fausta, Devara Ega]]>;
<![CDATA[Kasy, Fransisca Indraningsih]]>;
<![CDATA[Mahasindi, Melya Ayu]]>
<![CDATA[ Journal of Physics: Theories and Applications Vol 7, No 2 (2023): Journal of Physics: Theories and Applications ]]>
Publisher : <![CDATA[Universitas Sebelas Maret ]]>
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DOI: 10.20961/jphystheor-appl.v7i2.71762
<![CDATA[The Nd2O3 doped lead borate glass with composition 45B2O3-(40-x)PbO-11ZnO-4Na2O-xNd2O3 (x=0; 0.5; 1.0; 1.5; 2.0; 2.5) mol% were fabricated using melt quenching method at 950oC for 35 minutes. The characterization of physical properties of glasses doped Nd2O3 were measured by density (ρ) based on the Archimedes principle. The other physical parameters such as molar volume (Vm), oxygen packing density (OPD), polaron radius (rp), ionic radius (ri), field strength (F), molar refraction (Rm), and metallization (Mn) were calculated using equation which derived from density. According to the measurement, the density of glasses decreased from 5.774 to 4.527 gr/cm3 while molar volume oppositely increased from 23.17 to 30.18 cm3/mol due to atomic mass of Nd (144.24) smaller than Pb (207.2). Along with the increase of molar volume, there were decreasing of the OPD, the polar radius (1.731 －1.095) Å and the ion radius (4.296－2.717) Å iof glasses Meanwhile, the field strength and metallization properties of the glasses increased as a result of the reduction rp and ri. The investigation of molar refractive shows an increasing trend because the addition of the concentration Nd2O3.]]>
<![CDATA[Multiple inversions of Rayleigh wave dispersion curve for geotechnical site characterization using particle swarm optimization dan genetic algorithm ]]>
<![CDATA[Wirawan, Rezki]]>;
<![CDATA[Safani, Jamhir]]>;
<![CDATA[Rubaiyn, Al]]>
<![CDATA[ Journal of Physics: Theories and Applications Vol 7, No 2 (2023): Journal of Physics: Theories and Applications ]]>
Publisher : <![CDATA[Universitas Sebelas Maret ]]>
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DOI: 10.20961/jphystheor-appl.v7i2.79065
<![CDATA[The inversion of the Rayleigh wave dispersion curve is a crucial step in the multi-channel analysis of surface waves (MASW) method, used to obtain the shear wave velocity (Vs) profile. The nonlinear and multimodal nature of the dispersion curve makes a global optimization approach, such as particle swarm optimization (PSO) and genetic algorithm (GA), the optimal choice for inversion. This study aims to compare the performance of multiple inversions of PSO (MI-PSO) and multiple inversions of GA (MI-GA) in solving the inversion problem of the Rayleigh wave dispersion curve. The test results indicate that the utilized MI-PSO outperforms MI-GA in terms of computational time and accuracy of the obtained model]]>
<![CDATA[Tsunami event in Flores: literature review ]]>
<![CDATA[Khusnani, Azmi]]>;
<![CDATA[Jufriansah, Adi]]>;
<![CDATA[Thalo, Ota Welly Jenni]]>
<![CDATA[ Journal of Physics: Theories and Applications Vol 7, No 2 (2023): Journal of Physics: Theories and Applications ]]>
Publisher : <![CDATA[Universitas Sebelas Maret ]]>
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DOI: 10.20961/jphystheor-appl.v7i2.74625
<![CDATA[The Flores Sea has experienced devastating earthquakes with magnitudes >7 over the past 30 decades. It can trigger a tsunami and provide important theoretical, experimental, and field information. The seismicity study stated that the island of Flores had experienced tsunamis during the pre-instrumental period (1815, 1818, 1820, and 1836) and the pre-instrumental period in 1992. This study discusses the development of tsunami research in Flores using a literature review approach. The data source comes from the Scopus database, with data analysis using VOSviewer. The search results obtained a total of 22 documents, with the result that the 1992 Flores earthquake became the main research topic and the beginning of the era of modern tsunami science.]]>
<![CDATA[A comparative study of the Schwarzschild metric tensor and the Howusu metric tensor using the radial distance parameter as a measuring index ]]>
<![CDATA[Obaje, VIivian Onechojo]]>
<![CDATA[ Journal of Physics: Theories and Applications Vol 7, No 2 (2023): Journal of Physics: Theories and Applications ]]>
Publisher : <![CDATA[Universitas Sebelas Maret ]]>
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DOI: 10.20961/jphystheor-appl.v7i2.77212
<![CDATA[The Einstein Curvature Tensor using Schwarzschild Metric Tensor and the Howusu Metric Tensor were investigated. The Einstein Curvature Tensor derived from the Howusu Metric Tensor were compared to the Einstein Curvature Tensor derived from the Schwarzschild Metric Tensor. Results of the analysis indicated that the behavior of the Howusu were, to a large extent behaved differently from that of the Schwarzschild in the limit as the radial distance .Similar results were also obtained in the limit as .]]>
<![CDATA[Shielding parameters of leaded cement mortar ]]>
<![CDATA[Abdel-Razek, Yassin A.]]>
<![CDATA[ Journal of Physics: Theories and Applications Vol 7, No 2 (2023): Journal of Physics: Theories and Applications ]]>
Publisher : <![CDATA[Universitas Sebelas Maret ]]>
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DOI: 10.20961/jphystheor-appl.v7i2.78375
<![CDATA[The Cathode ray tubes (CRTs) represent more than 70% of global e-waste sets. The glass of the CRT is doped with lead to prevent emission of radiations especially electrons. The glass at the panel and neck of the CRT along with the cement mortar, a mixture of 70% neck glass and 30% cement (mix70), are investigated mathematically as shielding materials from photons having energies in the range 0.06-3 (MeV). Experimentally the material mix70 is tested at energies 0.238 and 0.583 (MeV). Good agreement was recognized between the calculated shielding parameters and that obtained experimentally while complete equality between the calculated parameters carried out using the online XCom software or Phy-X software except at low energies for concrete material. Glass from panel, neck and mix70 have acceptable shielding characteristics at and below the energy 0.238 (MeV) or generally at the X-ray region. Neck glass has good shielding parameters at the chosen energy region and it is nominated as a shielding material for many nuclear applications. To enhance the shielding characteristics of the material mix70 it should be compacted during preparation to get higher density. The present work tested the shielding properties of leaded glass composites to find out its integrity for practical shielding applications and radiological safety.]]>
<![CDATA[Geophysical investigation of the effects of refuse dumpsites on the quality of groundwater in some major towns in Niger state, Nigeria ]]>
<![CDATA[Tsepav, Matthew Tersoo]]>;
<![CDATA[Usman, T Y]]>;
<![CDATA[Alfa, B]]>;
<![CDATA[Worogi, A I]]>;
<![CDATA[Adamu, Y]]>;
<![CDATA[Abdullahi, M.]]>
<![CDATA[ Journal of Physics: Theories and Applications Vol 7, No 2 (2023): Journal of Physics: Theories and Applications ]]>
Publisher : <![CDATA[Universitas Sebelas Maret ]]>
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DOI: 10.20961/jphystheor-appl.v7i2.73770
<![CDATA[This study was carried out to investigate the effects of refuse dumpsites on the quality of groundwater in some major towns in Niger State, Nigeria. A total of sixty (60) Vertical Electrical Soundings (VES) was conducted across fifteen (15) dumpsites within the study areas; twenty (20) VES at each of the three (3) dumpsites of Lapai, Bida and Paiko using Schlumberger configuration to investigate the possibility of contamination of groundwater in the areas. The resistivity data were collected using G41 Resistivity Meter and interpreted using IPI2Win Software. The results revealed four geo-electrical layers. The resistivity values of the Aquifer layers of Lapai dumpsites ranged from 136 Ωm to 681 Ωm, with the thickness ranging between 2.82 - 8.77 m at the depth of 4.21 – 10.90 m at Engr. A. A. Kure dumpsite. At Malle dumpsite, the thickness range was (1.10 – 4.39) m and the depth at 5.27 – 12.70 m. The resistivity values of the aquifer layers at Bida dumpsites ranged from 161.10 Ωm to 223 Ωm, with the thickness ranging between 4.86 and 11.00 m at the depths of 7.65 – 12.70 m while at Mayaki Ndajiya dumpsite, the thickness range was 4.91 – 23.46 m at the depth of 6.84 – 25.57 m. Also the resistivity values of the aquifer layers of Paiko dumpsites ranged from 20.90 Ωm to 110 Ωm with thicknesses ranging from 2.33 to 14.00 m at the depth range of between 3.85 and 15.50 m at Gidan Marafa dumpsite while the thickness range was from 3.19 – 9.04 m at the depth of 6.70 – 14.14 m at Angwan Akimi dumpsite. These values were used to compute the Dar Zarrouk parameters which indicate aquifer protectivity. The protective capacity of the over burden rock materials at Lapai dumpsites ranged from 0.010 – 0.076 Siemens, while at Bida dumpsites it ranged 0.009 – 0.152 Siemens and at Paiko dumpsites it ranged between 0.025 – 0.046 Siemens. The low protective features observed in the Aquifer zones of Lapai, Bida and Paiko dumpsites indicated the possibility of leachate migration from the waste dumpsites infiltrating into the aquifers and polluting the groundwater. It is evident, from the results of this geophysical survey that the water in the study areas of Lapai, Bida and Paiko could be polluted leading to water related diseases.]]>
<![CDATA[Experiments in nuclear physics using inexpensive instruments ]]>
<![CDATA[Saminan, Saminan]]>;
<![CDATA[Silviana, Fitria]]>;
<![CDATA[prayogi, soni]]>
<![CDATA[ Journal of Physics: Theories and Applications Vol 7, No 2 (2023): Journal of Physics: Theories and Applications ]]>
Publisher : <![CDATA[Universitas Sebelas Maret ]]>
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DOI: 10.20961/jphystheor-appl.v7i2.78406
<![CDATA[The scarcity of experimental activities is one of the challenges of teaching current physics. This study resolves these issues and suggests three nuclear physics experiments using a low-cost ion chamber, whose construction is explained: the measurement of 222Rn progeny collected from the indoor air; the measurement of the range of alpha particles emitted by the 232Th progeny, present in lantern mantles and in thoriated welding rods, as well as by the air filter containing 222Rn progeny; and the measurement of 220Rn half-life collected from In this study, the experimental methods and anticipated findings are presented, showing that the experiments could help nuclear physics curricula. These procedures may provide broad access to either academic laboratories in high schools or colleges and the equipment may be used to create novel nuclear physics teaching strategies]]>
