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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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Precursor concentration effect on optical properties of carbon dots from Cassava’s peels Permono Adi Putro; Liszulfah Roza; Isnaeni Isnaeni
Journal of Physics: Theories and Applications Vol 2, No 2 (2018): Journal of Physics: Theories and Applications
Publisher : Universitas Sebelas Maret

Carbon dots (C-dots) are a new type of fluorescent nanoparticles that can be readily synthesized from natural sources, such as cassava’s peels. In this work, C-dots were synthesized from cassava’s peels using low temperature green synthesis based. The Green synthesis techniques were done by using water as a solvent non-chemical and natural sources. The Synthesis was done using various concentrations of precursor from 0.25%, 0.50%, 1.0% and 2.0%. Optical properties of C-dots were characterized using spectrophotometer UV-Vis, photoluminescence (PL) and time resolved photoluminescence (TRPL). The concentration of precursor lead to differences in molecular density and content of preparation thus affecting optical properties. The performance of C-dots optical properties were dominated by the transition of electrons n–π* on structure aromtic C=O which originate from the surface of C-dots. The result of C-dots sample with a concentration of 2.0% precursors has the best emission effiency. This provides the potential for C-dots cassava’s peels in the aqueous solution to be applied as cellular bioimaging and biosensing metal ions and salts.

Analytical solution of Klein Gordon equation Trigonometric Pӧschl-Teller potential using asymptotic iteration method Dewanta Arya Nugraha; A Suparmi; C Cari
Journal of Physics: Theories and Applications Vol 1, No 1 (2017): Journal of Physics: Theories and Applications
Publisher : Universitas Sebelas Maret

Radial part of Klein Gordon equation for trigonometric Pӧschl-Teller potential was obtained within framework of a centrifugal term approximation. The relativistic energy spectrum and wave functions was obtain by using asymptotic iteration method. The value of relativistic energy was calculated numerically using Matlab 2013. The results showed that the relativistic energy is increasing due to the increase of potential constant and quantum number.

Non-standard and Numerov finite difference schemes for finite difference time domain method to solve one-dimensional Schrödinger equation Lily Maysari Angraini; I Wayan Sudiarta
Journal of Physics: Theories and Applications Vol 2, No 1 (2018): Journal of Physics: Theories and Applications
Publisher : Universitas Sebelas Maret

The purpose of this paper is to show some improvements of the finite-difference time domain (FDTD) method using Numerov and non-standard finite difference (NSFD) schemes for solving the one-dimensional Schrödinger equation. Starting with results of the unmodified FDTD method, Numerov-FD and NSFD are applied iteratively to produce more accurate results for eigen energies and wavefunctios. Three potential wells, infinite square well, harmonic oscillator and Poschl-Teller, are used to compare results of FDTD calculations. Significant improvements in the results for the infinite square potential and the harmonic oscillator potential are found using Numerov-NSFD scheme, and for Poschl-Teller potential are found using Numerov scheme.

Analytical solution of energy eigen value, eigen function and angular wave function of Dirac equation with Rosen Morse plus Rosen Morse potential in terms of Romanovski polynomials for exact spin symmetry Ihtiari Prasetyaningrum; C Cari; A Suparmi
Journal of Physics: Theories and Applications Vol 1, No 1 (2017): Journal of Physics: Theories and Applications
Publisher : Universitas Sebelas Maret

The energy eigenvalues and eigenfunctions of Dirac equation for Rosen Morse plus Rosen Morse potential are investigated numerically in terms of finite Romanovsky Polynomial. The bound state energy eigenvalues are given in a closed form and corresponding eigenfunctions are obtained in terms of Romanovski polynomials. The energi eigen value is solved by numerical method with Matlab 2011.

Thermodynamics of a Non-Stationary Black Hole Based on Generalized Uncertainty Principle Mustari Mustari; Yuant Tiandho
Journal of Physics: Theories and Applications Vol 1, No 2 (2017): Journal of Physics: Theories and Applications
Publisher : Universitas Sebelas Maret

In the general theory of relativity (GTR), black holes are defined as objects with very strong gravitational fields even light can not escape. Therefore, according to GTR black hole can be viewed as a non-thermodynamic object. The worldview of a black hole began to change since Hawking involves quantum field theory to study black holes and found that black holes have temperatures that analogous to black body radiation. In the theory of quantum gravity there is a term of the minimum length of an object known as the Planck length that demands a revision of Heisenberg's uncertainty principle into a Generalized Uncertainty Principle (GUP). Based on the relationship between the momentum uncertainty and the characteristic energy of the photons emitted by a black hole, the temperature and entropy of the non-stationary black hole (Vaidya-Bonner black hole) were calculated. The non-stationary black hole was chosen because it more realistic than static black holes to describe radiation phenomena. Because the black hole is dynamic then thermodynamics studies are conducted on both black hole horizons: the apparent horizon and its event horizon. The results showed that the dominant correction term of the temperature and entropy of the Vaidya-Bonner black hole are logarithmic.

Fabrication of dye Rhoeospathacea with concentration variation in dye-sensitized solar cells (DSSC) Sri Sumardiasih; Agus Supriyanto; C Cari
Journal of Physics: Theories and Applications Vol 1, No 1 (2017): Journal of Physics: Theories and Applications
Publisher : Universitas Sebelas Maret

Dye-sensitized solar cell (DSSC) is a device that directly converts visible light into electrical energy. In this work we used dye was extracted from Rhoeo spathacea. A natural dye was directly mixed with TiO2 anatase to obtain dyed titanium dioxide which can be used as photoanode for DSSC by varying the volume of dye. The first variation is 2 ml dye mixed with 1 ml of TiO2, and the second variation is 3 ml dye mixed with 1 ml of TiO2. The absorbance spectra of the dye and dye titanium dioxide have been investigated by spectroscopy UV-Visible Lambda 25 and the conversion efficiency of dye titanium dioxide used Keithley 2602A meter. The DSSC based on dye titanium dioxide with varying volume of dye showed that the efficiency of the the second variation is 0,033% which is higher than the first variation (0,023%) as obtained from I-V characterization.

Optimization of the amount of gas moles determination through Boyle’s law and Gay-Lussac’s law experiments Kunlestiowati Hadiningrum; Ratu Fenny Muldani
Journal of Physics: Theories and Applications Vol 2, No 2 (2018): Journal of Physics: Theories and Applications
Publisher : Universitas Sebelas Maret

Boyle’s Law describes the inverse relationship between absolute pressure and air volume, if the temperature is constant in a closed system. Gay Lussac’s Law states that the pressure of a gas mass is directly proportional to the absolute temperature of the gas, when the volume is held constant. The macroscopic quantity associated with both laws includes the number of moles of gas. The purpose of the study is to calculate the number of moles of gas through Boyle’s Law and Gay Lussac’s Law experiments. The experimental results were confirmed by calculating the number of moles theoretically, so that it can be concluded that the experimental device settings which the closest to the theoretical results. The Boyle’s Law experimental results with a pipe cross-sectional area of 54.08 mm2, at a temperature of 295 K obtained 4.67 x 10-4 moles, its relative uncertainty is 7.60%, at a temperature of 299.1 K obtained 3.97 x 10- 4 moles, the relative uncertainty value is 0.51%, and at a temperature of 299.5 K obtained 5.20 x 10-4 moles, the relative uncertainty value is 12.56%. The average relative uncertainty value of the three experiments is 6.89%. The results of the Gay Lussac’s Law experiment, at a gas volume of 0.578 x 10-3 m3, obtained the number of moles in a row of 1.38 x 10-2 moles, 1.83 x 10-2 moles and 1.33x 10-2 moles, theoretical calculation of 2.14 x 10-2 moles. The average value of the relative uncertainty of the three experiments is 24.3%. Based on these results, it can be concluded that the results of calculating the number of moles through Boyle’s Law experiments are closest to theoretical calculations.

Implementation method experiments on student results on substances being material and its amendment in class VII SMP Negeri 22 Eka Trisianawati; Nurhayati Nurhayati; Lusi Beniwati
Journal of Physics: Theories and Applications Vol 1, No 1 (2017): Journal of Physics: Theories and Applications
Publisher : Universitas Sebelas Maret

The aims of this research were to know: (1) the average student learning outcomes in states of matter and changes the material that is taught by an experimental method in class VII SMP Negeri 22 Pontianak; (2) the average student laerning outcomes in states of matter and changes the material that is taught by conventional method in class VII SMP Negeri 22 Pontianak; (3) the average difference in student learning outcomes given the experimental method to the average student learning outcomes given conventional methods in states of matter and changes the material in class VII SMP Negeri 22 Pontianak . This research was a quasi-experimental design with Nonequivalent Control Group Design. The study population was all students of class VII SMP Negeri 22 Pontianak which consists of five classes, namely class VII A, VII B, VII C, VII D and E VII academic year 2015/2016, with a sampling technique that cluster random sampling. Based on the results of class VII A lottery was chosen as an experimental class and class VII D as the control class. The data collection technique used is the technique of measurement. Data collection tool used is a form of essay test. The hypothesis was tested using the t-test. Based on the results of data analysis can be concluded that: (1) the average student learning outcomes in states of matter and changes the material that is taught by an experimental method in class VII SMP Negeri 22 Pontianak is 64.96, (2) the average student learning outcomes in material states of matter and the changes that are taught by conventional methods in class VII SMP Negeri 22 Pontianak is 49.85, and (3) there are differences in the average student learning outcomes given the experimental method to the average student learning outcomes given in the conventional method material phase transition and changes in class VII SMP Negeri 22 Pontianak.

Analytical solution of the Bohr-Mottelson equation in minimal length effect for cotangent hyperbolic potential using the hypergeometric method Siti Noor Fatimah; A. Suparmi; C. Cari; Isnaini Lilis Elviyanti
Journal of Physics: Theories and Applications Vol 2, No 1 (2018): Journal of Physics: Theories and Applications
Publisher : Universitas Sebelas Maret

The rigid deformed nucleus of minimal length effect is investigated using the Bohr-Mottelson equation that influenced by cotangent hyperbolic potential. The Bohr-Mottelson equation in effect a minimum length resolved hypergeometric method for determining the energy spectrum and the wave functions. Energy spectrum was calculated using Matlab software and the wave function is displayed in the form of hypergeometric.

Fabrication of dye natural as a photosensitizers in dye-sensitized solar cells (DSSC) Hardani Hardani; Hendra Hendra; Muh. Iman Darmawan; C Cari; Agus Supriyanto
Journal of Physics: Theories and Applications Vol 1, No 1 (2017): Journal of Physics: Theories and Applications
Publisher : Universitas Sebelas Maret

The purpose of this study was to obtain optical properties (absorption spectrum) and electrical properties (photoconductivity) of organic dyes in DSSC performance. optical and electrical properties were tested by using UV-Visible Spectrophotometer and Elkahfi 1601 PC 100 / IV meter, respectively, while Keithley Type 2600A is used for the characterization of DSSC. This study is a great base to explore and investigate the development of DSSC solar cells using natural dyes (organic). Spectra optimal absorption and photoconductivity produced by natural dyes (organic). The results of this study indicate that the absorption spectrum of natural dyes (organic) in the range of 300-500 nm. electrical characteristics (I-V) of the increase in linear dye under illumination. I-V characteristics of DSSC from organically produced natural dyes to color the biggest-mangosteen obtained Voc of 565 mV; JSC = 1.52 A / m2; FF = 0.12; and η_ef is approximately 0.09%, respectively,. The conclusion of this study, natural dyes (organic) can be an attractive alternative as a dye.

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Contact Name Dewanta Arya Nugraha

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Location Kota surakarta, Jawa tengah INDONESIA

Abstract

Abstract

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Abstract

Abstract

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