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Journal of Physics: Theories and Applications

jphystheor-appl
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Published by Universitas Sebelas Maret

ISSN : 25497316 EISSN : 25497324 DOI : -

Core Subject : Science, Education,

Education Materials Science & Nanotechnology Physics

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.

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Articles 94 Documents

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Gravity anomaly to identify Walanae fault using second vertical derivative method Marsellei Justia; Muhammad Fikri H Hiola; Nur Baiti Febryana S
Journal of Physics: Theories and Applications Vol 2, No 1 (2018): Journal of Physics: Theories and Applications
Publisher : Universitas Sebelas Maret

Research has been conducted to identify the Walanae Fault, coordinates 4–6 S and 118-120 E using anomalous gravity data. This research uses data measurement of Topography and the Free Air Anomaly from the TOPEX/Poseidon satellite. Then the authors processed to obtain the bouguer anomalies and made modeling by using the Surfer 10. The authors used the Second Vertical Derivative (SVD) with filter Elkins of Moving Average then analyze the graph of the SVD. The results shows the value of the residual anomaly in the north of fault is 25.21 mGal, in the middle occur range 17.67 mGal to 24.98 mGal and 30,376 mGal in the south of fault. The authors indicates the existence of a difference between the gravity between the Walanae Fault with surrounding geologic. From these results also show that Walanae Fault has a reverse fault mechanism in the northern part and the normal fault mechanism in the middle to the south, the authors conclude that the Walanae Fault is divided into two segments, that is the northern and the southern segment.

Effect of bismuth substitution on magnetic properties of CoFe2O4 nanoparticles: Study of synthesize using coprecipitation method Didik Eko Saputro; Utari Utari; Budi Purnama
Journal of Physics: Theories and Applications Vol 3, No 1 (2019): Journal of Physics: Theories and Applications
Publisher : Universitas Sebelas Maret

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.20961/jphystheor-appl.v3i1.31764

Abstract: The effect of bismuth ion substitution on the magnetic properties of cobalt ferrite nanoparticles was identified in this study. This method used in this study was coprecipitation method using 0.1 bismuth ion concentration. The results on hysteresis loop showed that the saturation magnetization of cobalt ferrite nanoparticles decreased with the substitution of bismuth ions, but the coercive field experienced the opposite. Saturation magnetization decreased from 57.97 to 51.19 emu / g, while coercive fields increased from 0.64 to 0.84 kOe.

Optical properties of dye DN-F01 as sensitizer Febrina Ramadhani; Agus Supriyanto; Mohd Khairul Bin Ahmad; Nadiyah El-Haq Diyanahesa; Diani Galih Saputri
Journal of Physics: Theories and Applications Vol 3, No 1 (2019): Journal of Physics: Theories and Applications
Publisher : Universitas Sebelas Maret

Dye-Sensitized Solar Cell (DSSC) is a solar cell made from organic material that works with an electrochemical photo system to convert solar energy into electrical energy. The components of DSSC consist of transparent conductive substrates, dyes, semiconductors, electrolytes and counter electrodes. Dye as a sensitizer is has an important role in DSSC performance improvement. This study aims to obtain optical characterization such as absorbance spectrum and transmittance from DSSC using dye DN-F01 with concentration 2x10-3 M. Optical characterization has been tested using a UV-VIS Spectrophotometer Shimadzu UV-1800. The test results show that the absorbance spectrum of the dye is at a wavelength of 400-500 nm. Band gap energy of DN-F01 has obtained from its absorbance and transmittance value is about 2,46 eV.

The impact of forest fire on air-quality and visibility in Palangka Raya Sumaryati Sumaryati; Nani Cholianawati; Asri Indrawati
Journal of Physics: Theories and Applications Vol 3, No 1 (2019): Journal of Physics: Theories and Applications
Publisher : Universitas Sebelas Maret

It has been analyzed impact of forest fire on the air quality using PM10 parameter and visibility during 2000 – 2014 in Palangka Raya, Central Kalimantan province. Palangka Raya is an affected forest fire area with a monsoonal rainfall type which has one peak of the rainy season in January and one peak of the dry season in August. Drought condition has an impact on rising forest fire intensity causes increasing of PM10 concentration and decresing of visibility in July to November moreover when there is an El Niño phenomenon. The result of PM10 analysis shows that the air quality index in Palangka Raya during December - June is in a good level category and still below the ambient air quality standard with an average concentration of 19 µg/m3. The impact of forest fire on declining air quality due to increasing of PM10 concentration occurred in July – November with an average concentration rising of 129 µg/m3. The El Niño phenomenon rises the PM10 concentration due to increasing of forest fires, but the increasing of PM10 is not comparable to the strength of El Niño, because of combustion condition and and human activities that play a role in forest fires. The worst impact of El Niño occurred in 2002, although the El Niño strength was only moderate, which is a half the time from July to November Palangka Raya covered air quality with dangerous levels with PM10 concentrations of more than µg/m3. A high PM10 concentration environment reduces the visibility significantly, which is visibility in the no fire condition about 8 km, but when the huge forest fire the visibility drops to 0.1 km.

Determination of temporal value of a-value and b-value to identify the level brittle of rock and seismic activity in the Palu region Afryanti Veronika Simangunsong; Ramadhan Priadi; Anak Agung Istri Dwilyantari; Agus Marsono
Journal of Physics: Theories and Applications Vol 3, No 1 (2019): Journal of Physics: Theories and Applications
Publisher : Universitas Sebelas Maret

The Palu area is a region that has a high seismic potential as a result of the existence of the Palu Koro Fault. The Koro Palu Fault is an active sinistral fault that moves with velocity around 25-30 mm/year. This research purpose to determine the a-value and b-value temporally for identify rock brittle levels and seismicity levels in the Palu area using the Maximum Likelihood Guttenberg-Richter method. The data used in this study are earthquake data from the BMKG and USGS catalogs for 2008-2018 over a period of 10 years located at 0840 LU 40 2.620LS and 118,590 BT - 121.70 BT. Based on the results of data processing, there were 3033 earthquake distributions in the earthquake over a 10-year period. The calculation results show variations in the value of b-values in the range 0.55-0.961 and the a-value in the range 3.63-5.42. The highest b-value was obtained in 2015 at 0.961 as an indication of increased seismic activity in the Palu area. After the Palu M 7.4 earthquake on 28 September 2018, there was a significant decrease in the value of the b-value to 0.685. Based on the trend of b-value values which continued to decline from 2015 until 2018, it was identified in the rock's resistance to stress is high in the Palu area. Whereas for the seismicity index value of the Palu area of 0.040789 with the earthquake return period 7 is 25 years.

Comparison of the superconducting rectangular critical fields with the same area at κ = 1.5 Fuad Anwar; C Cari; Alqaan Maqbullah Ilmi
Journal of Physics: Theories and Applications Vol 3, No 2 (2019): Journal of Physics: Theories and Applications
Publisher : Universitas Sebelas Maret

The Time Dependent Ginzburg-Landau (TDGL) equation can be used to study the characteristics of superconductors in the evolution of time to reach equilibrium. This study uses the ѰU method to numerically calculate critical field values more easily. Previous research has been carried out on size variations, kappa variations, proximity effects and so on. In this study, a comparison between squares and rectangles with the same size of area for type II superconductor , then it is found that the critical field Hc3 is the same value for each of the same area.

Study of a silica glass SiO2-Na2O refractive index to fabrication of fiber optic with Brewster method Ahmad Aftah Syukron; Isnaini Lilis Elviyanti
Journal of Physics: Theories and Applications Vol 3, No 2 (2019): Journal of Physics: Theories and Applications
Publisher : Universitas Sebelas Maret

One of the critical parameters in the fabrication of fiber optic is refractive index value from the fiber optic material. That is because the main requirement phase of critical angle on the fiber optic waveguide is a core refractive index higher than the cladding. Therefore, refractive index values must be calculated first. The research aim is to study refractive index value of fiber optic material on the fiber optic fabrication. Refractive index value determined by using the brewster method. For this aim, the first step is an establish glass silica to a thin plate. Then thin plate inserts to the sketch of brewster experiment. The brewster method has the aim to determine the reflectance value of the light on transfer magnetic (TM) polarization. The Brewster angle determined by searching the minimum reflectance value of the light on this TM polarization. In this research, the brewster angle obtained by 55.333 degrees. This brewster angle used to calculate the refractive index value from the fiber optic material glass silica. The result of refractive index value at 1.446.

Optical properties of dye DN-F05 as a good sensitizer Diani Galih Saputri; Agus Supriyanto; Mohd Khairul Ahmad; Nadiyah El-Haq Diyanahesa; Febrina Ramadhani
Journal of Physics: Theories and Applications Vol 3, No 2 (2019): Journal of Physics: Theories and Applications
Publisher : Universitas Sebelas Maret

This research studied the effect of adding synthetic dye DN-F05 (red dye) to electrical and optical properties. Dye-Sensitized Solar Cell (DSSC) sandwich components are consist of FTO/TiO2-Dye-elektrolit-Platina/FTO. In this study, the working electrodes were made by Titanium dioxide (TiO2) which was deposited on FTO glass and then annealed at 450oC for 30 minutes. The dye concentration DN-F05 was made with a mass of 0.001 gr, then will be stirred for 2 hours into 5 ml of ethanol at a temperature of 40oC. In this study the spin coating method is used with a rotational speed of 1000 rpm for 20 seconds. Characterization of optical properties was carried out using a UV-VIS spectrophotometer to determine the absorbance curve of dye and to get Gap energy. The peak absorbance value was obtained at wavelengths between 400-700 nm. This proved that the addition of DN-F05 dye concentration has a major influence on the optical properties.

The effect of type of sound damper material in the Helmholtz resonator to the output power spectrum of acoustic energy Harvester Hedwigis Harindra; Agung Bambang Setio Utomo; Ikhsan Setiawan
Journal of Physics: Theories and Applications Vol 3, No 2 (2019): Journal of Physics: Theories and Applications
Publisher : Universitas Sebelas Maret

Acoustic energy harvesting is one of many ways to harness acoustic noises as wasted energy into useful electical energy using an acoustic energy harvester. Acoustic energy harvester that tested by Dimastya (2018) which is consisted of loudspeaker and Helmholtz resonator, produced two-peak spectrum. It is suspected that the first peak is due to Helmholtz resonator resonance and the second peak comesfrom the resonance of the conversion loudspeaker. This research is to experimentally confirm the guess of the origin of the first peak. The experiments are performed by adding silencer materials on the resonator inner wall which are expected to be able to reduce the height of first peak and to know how they affect the output electric power spectrum of the acoustic energy harvester. Three different silencer materials are used, those are glasswool, acoustic foam, and styrofoam, with the same thickness of 12 cm. The results show that glasswool absorbs sound more effectively than acostic foam and styrofoam. The use of glasswool, acoustic foam, and styrofoam with 12 cm thickness lowered the first peak by 90% (from 39 mW to 0,5 mW), 82% (from 39 mW to 0,7 mW), and 82% (from 39 mW to 0,7 mW), respectively. Based on these results, it is concluded that the guess of the origin of the first peak is confirmed.

Performance of natural chlorophyll Amaranthus and Carica Papaya dye on TiO2 coating in the making of dye sensitized solar cell (DSSC) through the spin coating method Fernince Ina Pote; Agus Supriyanto; Fahru Nurosyid; Deni Kurniawan
Journal of Physics: Theories and Applications Vol 3, No 2 (2019): Journal of Physics: Theories and Applications
Publisher : Universitas Sebelas Maret

The natural dye extracted from Amaranthus dye and Carica Papaya dye which has been prepared in ethanol solution as a sensitizer on DSSC. The Spin coating method is used so that the deposition on TiO2 gets a homogeneous thin layer on the active area of the FTO substrate. The dye solution was tested for characterization using the Elkahfi I-V Meter and UV-Vis 1601 while the FTO structure substrate that had been prepared as a sandwich was tested using Keithley I-V type 2602A. The result of absorbance of dye is at a wavelength of 400 nm - 800 nm and there is also a shift in wavelength and peak absorption of the dye. The greatest efficiency was obtained from chlorophyll amaranthus which is 0.730% while chlorophyll Carica papaya obtained an efficiency of 0.432%. In the combination of Amaranthus dye and Carica papaya dye, the efficiency was 0.526%. High efficiency on TiO2 electrodes shows good performance on Dye-sensitized solar cells.

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Home Page

OAI Link

Editorial Team

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Contact Name Dewanta Arya Nugraha

Contact Email dewanta.an@gmail.com

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Journal Mail Official jphystheor.appl@mail.uns.ac.id

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Location Kota surakarta, Jawa tengah INDONESIA

Abstract

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Abstract

Abstract

Contact Name
Dewanta Arya Nugraha

Contact Email
dewanta.an@gmail.com

Phone
-

Journal Mail Official
jphystheor.appl@mail.uns.ac.id

Editorial Address
-

Location
Kota surakarta,

Jawa tengah

INDONESIA