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Journal of Physics: Theories and Applications
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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Absorption Spectra Comparison of Tm/Ho-Codoped Bototellurite Glasses Azmi Saraswati; Ahmad Marzuki; Venty Suryanti
Journal of Physics: Theories and Applications Vol 5, No 2 (2021): 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.v5i2.53809

Abstract

This paper presents a comparison study of absorption spectra of borotellurite glasses with compostion: 20TeO2 – 15Bi2O3 – 3TiO2 – (4-x) Na2CO3 – 1Tm2O3 - xHo2O3 where x = 0; 0.5; 1; 1.5; 2; 2.5 (mol%). All glasses are fabricated using melt quenching method. Absorption spectra were recorded at room temperature in the spectral range of 200 – 1100 nm. Within this range, glass with x = 0 mol % of Ho2O3 shows 2 absorption peaks which corresponds to electronics transition from 3H6 to state to 3F3 and 3H4.   For x = 0.5; 1; 1.5; 2; 2.5 (mol%), nine absorption peaks corresponding to electronics transition from 3H6 to state to 5G5, 5G6, 1G4, 1G4, 5F3, 5F4, 5F5, 3F3, and 3H4 are shown. It is shown that absorption at 680 nm and 790 are insensitive to the addition of Ho2O3 in contrast to that at 580 nm and 650 nm.
Analysis Perovskite Material Absorber Based on Nd0.6Sr0.4MnxFe1/2(1-x)Ti1/2(1-x)O3 (x = 0, 0.1, 0.2) by Sol-Gel Method Fajar Arif Kurniawan; Sitti Ahmiatri Saptari; Arif Tjahjono; Deni Shidqi Khaerudini
Journal of Physics: Theories and Applications Vol 6, No 1 (2022): 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.v6i1.59122

Abstract

The purposes of this research is to synthesis Nd0.6Sr0.4MnxFe1/2(1-x)Ti1/2(1-x)O3 (x = 0. 0.1, 0.2) materials as electromagnetic wave absorber using the sol-gel method. Materials characterized using X-Ray Diffraction (XRD) to determine the phase formed and Vector Network Analyzer (VNA) to determine the ability or strength of absorption of electromagnetic waves. The result of  XRD material has a structure orthorhombic with space group P b n m (62-3), the substitution of Mn+3 ions on Fe+3 ions and Ti+4 ions causes a phase change of the material from when x  =0 in the absence of Mn+3 ions 2 phases are formed, while when Mn+3 is substituted 1 phase is formed. The result of VNA with a frequency range of 8 – 12 GHz shows that the material has the ability to absorb electromagnetic waves up to 98,22% at a frequency of 9,5 GHz when x = 0.2. Thus, the material synthesis Nd0.6Sr0.4MnxFe1/2(1-x)Ti1/2(1-x)O3 has been successfully synthesized and has the ability to absorb electromagnetic waves.
Determination of Natural Radioactivity Level on Soil and Radiological Hazards in The Geotermal Area of Solok South, West Sumatera Nurul Khaira Sabila; Dinda Nurul Syifa; Mohammad Randy Alhafiz; Sri Oktamuliani
Journal of Physics: Theories and Applications Vol 5, No 2 (2021): 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.v5i2.59099

Abstract

Solok Selatan is one of the areas in West Sumatra that has geothermal potential, contains much higher levels of radioactive substances in the soil in the form of Radium (Ra-226), Thorium (Th-232), and Potassium (K-40).  This study aimed to measure the concentration of Ra-226. Th-232, and K-40 contained in the soil in the Solok Selatan which was then reviewed based on PERKA BAPETEN No. 9 of 2009 and UNSCEAR 2000, also evaluates the average radium equivalent activity (Raeq), representative level index (Iyr), external hazard index (Hex). Soil samples were collected from seven different locations. The radionuclide activity concentration was measured by using a gamma spectrometer in the PTKMR BATAN laboratory, with the results of the average radionuclide measurement Ra-226 being 28.58  Bq/kg, Th-232 was 44.74  Bq/kg and K-40 at 323.29  Bq/kg. For the average value of Raeq is 118,051 Bq/kg, Iyr is 0.853 and Hex is 0.335. Based on BAPETEN PERKA No. 9 of 2009 and UNSCEAR 2000, the radionuclide activity concentration was found still within safe limits. It does not pose a health hazard to the people living in the area.
Study of Klein Gordon Equation with Minimum Length Effect for Woods-Saxon Potetial using Nikiforov-Uvarov Functional Analysis Windy Andaresta; A Suparmi; C Cari
Journal of Physics: Theories and Applications Vol 5, No 2 (2021): 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.v5i2.55328

Abstract

The equation of Klein-Gordon for Woods-Saxon potential was discussed in the minimal length effect. We have found the completion of this equation using an approximation by suggesting a new wave function. The Klein-Gordon equation in minimal length formalism for the Woods-Sadon potential is reduced to the form of the Schrodinger-like equation. Then the equation was accomplished by Nikiforov-Uvarov Functional Analysis (NUFA) with Pekeris approximation. This method is applied to gain the radial eigensolutions with chosen exponential-type potential models. The method of NUFA is more compatible by eliminating vanishing the strict mathematical manipulations found in other methods. The energy calculation results showed that angular momentum, radial quantum number, minimal length parameter, and atomic mass influenced it. The higher the radial quantum number and angular momentum, the lower the energg. In contrast to the the minimal length, the energy will increase in value when the minimal length parameter is enlarged. An increase in atomic mass also causes energy to increase as the radial quantum number and angular momentum are held constant.
Soil Vulnerability Levels based on Microtremor Data using the HVSR method in the Old City Area of Semarang Supriyadi Supriyadi; Wahyu Humam Muttaqin; Khumaedi Khumaedi; Sugiyanto Sugiyanto
Journal of Physics: Theories and Applications Vol 6, No 1 (2022): 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.v6i1.59119

Abstract

Kota Lama Semarang with the Dutch colonial era relics is currently used as a cultural heritage tourist spot. As a cultural heritage tourism place, it is necessarily aware of the potential for earthquake disasters due to active faults and volcanic eruptions, as well as the phenomenon of land subsidence caused by geological conditions of young alluvium. One of the geophysical techniques to determine subsurface structure is microtremor measurement. This study aims to determine vulnerability level based on dominant frequency, amplification, and seismic vulnerability index using HVSR analysis in Kota Lama area. Microtremor data measurement contained 11 points with a data retrieval duration of 30 minutes. The results of microtremor data analysis obtained dominant frequency values of 7.03 - 19.36 Hz, amplification of 0.72 – 3.7, and seismic vulnerability index of 0.074 – 0.95. Based on the parameters, it can be concluded that the Kota Lama Semarang area has a low level of vulnerability.
Foundational Problems of Quantum Theory: Novel Approach to Temporal Probability Density Mustafa Erol; M. Emre Kuzucu
Journal of Physics: Theories and Applications Vol 6, No 1 (2022): 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.v6i1.58494

Abstract

Present study focuses on some foundational problems of quantum theory specifically deals with the concept of probability density and relating introductory problems. In this sense, the work initially investigates the origins of the general probability theory and re-examines the concepts of spatial and temporal probability densities based on genuine epistemological and ontological arguments. In order to tackle the foundational problems, standard theory is primarily memorised and criticized scientifically and philosophically in terms of foundationally disappearing term of time dependent potential energy within the time and space dependent Schrödinger wave equation. Based on those arguments, the problematic inconsistency between the spatial and temporal probability density functions is underlined. Given the problem, an original approach previously suggested, is concisely described and extended to resolve the existing problem. The novel approach, based on a novel time dependent Schrödinger wave equation, resolves the discrepancy with the classical wave equation and also leads to time dependent temporal probability densities even for the time free potential energies. Novel temporal probability density function is also normalized and has a fluctuation period of around 10-16 s which is very short compared to the atomic time scales.
Analysis of Earthquake Activity in Indonesia by Clustering Method Adi Jufriansah; Yudhiakto Pramudya; Azmi Khusnani; Sabarudin Saputra
Journal of Physics: Theories and Applications Vol 5, No 2 (2021): 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.v5i2.59133

Abstract

Indonesia is an area where three large tectonic plates meet, namely the Indo-Australian, Eurasian and Pacific plates, so that Indonesia is included in the earthquake-prone category, with 11,660 earthquake vibrations identified in the Meteorology, Climatology and Geophysics Agency (BMKG) database in 2019 The purpose of this study is to develop a classification of the distribution of earthquakes in Indonesia in 2019 based on the values of magnitude, depth, and position. This research was conducted by using the clustering method based on the K-means algorithm and the DBSCAN algorithm as a comparison. The results of the clustering show that the earthquake data analysis using the K-Means algorithm is superior with a silhouette index value of 0.837, while the DBSCAN algorithm has a silhouette index value of 0.730.
Correction of Air Buoyancy on E0-74 Mass Measurement with Pt-Ir K-112 Standard Zuhdi Ismail; Renanta Hayu Kresiani
Journal of Physics: Theories and Applications Vol 5, No 2 (2021): 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.v5i2.59192

Abstract

Determination of the mass value of E0 no 74 by calibrating it using the Pt-Ir standard has high complexity. This is caused by a significant difference in the density of standards. In this study, the E0 no 74 made of stainless steel has a density of 8.051.130 kg.m−3 calibrated by a mass standard of Pt-Ir which has a density of 21.552.940 kg.m−3. By Archimedes' law, the buoyant force generated by the air due to this density difference is huge. Therefore, the correction of air buoyancy is very important. The air buoyancy correction value is obtained by determining the air density using the CIPM-2007 formula. The correction that arises due to air buoyancy while weighing in the air is -0.00115 g and is greater at higher density. The implication of buoyancy correction is identified by analyzing the equivalence of the measurement result using a reference value from the calibration certificate issued by BIPM. The measurement result is equivalent if -1<En<1. The  value for the corrected mass is -0.078.
Analysis of crystal structure and reflection loss of material based on La0.7Sr0.3Mn1-x(Ni, Ti)x/2O3 (x=0.1, 0.3, and 0.5) applications for microwave absorbers Sitti Ahmiatri Saptari; Nada Hashida Lathifah; Arif Tjahjono; Deni Shidqi Khaerudini
Journal of Physics: Theories and Applications Vol 6, No 2 (2022): 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.v6i2.60178

Abstract

In this research, structural engineering of lanthanum manganite material based on La0.7Sr0.3Mn1-x(Ni,Ti)x/2O3 (x = 0.1; 0.3 and 0.5) was synthesized using the sol-gel method. The prepared samples were then characterized using X-ray Diffraction (XRD) and Vector Network Analyzer (VNA). X-Ray Diffraction (XRD) characterization results obtained a single. Substitution of Ni and Ti ions with a concentration of x = 0.1; 0.3; and 0.5 indicate that the formed sample has a rhombohedral structure with a space group R -3c, the presence of Ni and Ti ion substitution does not cause a change in the structure but there is a change in the lattice parameters and crystal size. Vector Network Analyzer (VNA) characterization in the range of 8 – 12 GHz produces the most optimal reflection loss intensity value of -11.8 dB at an optimal frequency of 10.58 GHz at a concentration of x = 0.5 with the ability to absorb microwaves of 93.39%. Thus the material La0.7Sr0.3Mn1-x(Ni,Ti)x/2O3 (x = 0.1; 0.3 and 0.5) can be used as a microwave absorbent material.
Dissemination of Pt-Ir k-112 mass measurement standards to E0-74 working standards with sub-divisional methods Zuhdi Ismail; Renanta Hayu Kresiani
Journal of Physics: Theories and Applications Vol 6, No 2 (2022): 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.v6i2.59195

Abstract

The mass value of the weights that are the mass unit's standard must be determined correctly, especially for E0 no 74 as the national working standard. Sub-division is the method commonly used to determine the mass of these weights. The sub-division method involved three standard weights in this study, namely Pt-Ir K-112, E0 no 74, and E0 no 75. Pt-Ir was used as the measuring standard, while the E0 class weights were test weights and check standard. The mass value of both weights was determined based on the mass value of Pt-Ir, which was analyzed using the weighted least squares method. The calibration obtained that the mass values of E0 no 74 and E0 no 75 were 1000,000046 g and 1000,000163 g, respectively. In measurement, the uncertainty value becomes a very important part of being stated. The uncertainty obtained for both E0 weights is 0.036 mg.

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