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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.

Arjuna Subject : -

Articles 94 Documents

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Development of Misconception Diagnostic Test in Momentum and Impulse Using Isomorphic Problem Nadiyah El-Haq Diyanahesa; Sentot Kusairi; Eny Latifah
Journal of Physics: Theories and Applications Vol 1, No 2 (2017): Journal of Physics: Theories and Applications
Publisher : Universitas Sebelas Maret

Preconception of the students influences to construct knowledge. They entered the classroom with conception formed from daily life. If their conception are not accordance with scientific concepts it’s called misconceptions. Misconception is believed by students and used consistently. Teachers need to find out information on a student misconceptions by providing diagnostic tests immedietly. Diagnostic instrument that measure more accurately concepts understanding is isomorphic. Problem isomorphic composed of several question in different context and representation, but solved by the same principles. The goal of this study developing a multiple-choice diagnostic test instrument isomorphic to diagnose misconception of students on momentum and impulse. This study is research and development using ADDIE model (Analysis, Design, Development or Production, Implementation or Delivery and Evaluations). Development steps consist of: (1) Analysis, (2) Design, (3) Develop, and (4) Implement. Before Implement steps, test instrument validated by lecture and two teachers. The instrument have been revised administered to students of class XI MIA 4 MAN Tlogo Blitar and X MIA U1 MAN 1 Tulungagung. Results of this study are 15 items multiple choice diagnostic instruments isomorphic belongs five indicators. Based on the validation by two physics teachers and lecturers, instrument accordance used as a diagnostic instrument capable to distinguish between students misconceptions and naive concept. Around 67.8% of students who have answered the description are still misconceptions. Based on the test analysis accordance with open ended question instrument test diagnostic isomorphic produce higher accuracy by taking two of the three questions the answers provided.

Student's Conception about Friction Force Direction in Physics Education Sebelas Maret University Puspita Septim Wulandari; C Cari; Nonoh Siti Aminah
Journal of Physics: Theories and Applications Vol 1, No 2 (2017): Journal of Physics: Theories and Applications
Publisher : Universitas Sebelas Maret

The student's conception of friction force direction on objects is different. Student’s conceptions are important to improve the next learning process. The aim to the research was to know student’s conception about friction force direction. This research was a qualitative descriptive. Samples consisted of 33 students from Physics Education UNS semester 1 who have not obtained the material friction in the lecture. Data collected through test and intervie. Data were analyzed by reduction, presentation, conclusion and verification. Based on the result of student conception showed the average of 82,82% student can describe the direction of friction force on objects with translational motion, 18,18% student can describe the direction of friction force on objects with translational and rotation motion inclane and all students can not describe the direction of friction force on bicycle wheels.

Utilization of estimated rainfall as an early warning system before flash flood event Fara Diva Claudia; Cecylia Putri Mawarni; Kadek Krisna Yulianti; Paulus Agus Winarso
Journal of Physics: Theories and Applications Vol 2, No 2 (2018): Journal of Physics: Theories and Applications
Publisher : Universitas Sebelas Maret

On October 10, 2018 there has been extreme weather in the form of heavy rain accompanied by lightning in Tanah Datar District, West Sumatra. This extreme weather caused flash floods and landslides that killed many people. Therefore, by using remote sensing data in the form of radar and satellite as well as WRF modeling (Weather Research and Forecasting) the authors conducted analysis of heavy rainfall events to determine the estimated rainfall and atmospheric dynamics during the occurrence of flash floods and landslides. WRF modeling is used to determine the condition of atmospheric lability. For the calculation of rainfall estimation, the method used is the Convective Stratiform Technique (CST) method that utilizes satellite data and the Z-R relation selection method that utilizes radar data. Then the calculation results from each method are verified using observation data. Relative bias shows the CST method and the selection of Z-R relations tend to be overestimate, but has a very high correlation value with observation data. Information on rainfall estimation and atmospheric dynamics is expected to be used to provide early warnings aimed at minimizing losses from the impact of disasters.

A model of nonlinear DNA-protein interaction system with Cornell potential and its stability Edy Syahroni; A Suparmi; C Cari; Fuad Anwar
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 determine the model of a interaction system between the DNA with protein. The interaction system consisted of a molecule of protein bound with a single chain of DNA. The interaction between DNA chain, especially adenine and thymine, and DNA-protein bound to glutamine and adenine. The forms of these bonds are adapted from the hydrogen bonds. The Cornell potential was used to describe both of the interactions. We proposed the Hamiltonian equation to describe the general model of interaction. Interaction system is divided into three parts. The interaction model is satisfied when a protein molecule triggers pulses on a DNA chain. An initial shift in position of protein xm should trigger the shift in position of DNA ym, or alter the state. However, an initial shift in DNA, yn, should not alter the state of a rest protein (i.e. xm = 0), otherwise, the protein would not steadily bind. We also investigated the stability of the model from the DNA-protein interaction with Lyapunov function. The stability of system can be determined when we obtained the equilibrium point.

Measurement of gravitational acceleration with the leak tank method Reliusman Dachi; Ikhsan Setiawan
Journal of Physics: Theories and Applications Vol 2, No 1 (2018): Journal of Physics: Theories and Applications
Publisher : Universitas Sebelas Maret

An experimental device of the mechanics of tank draining under gravity has been constructed. It mainly consists of a cylindrical tank with a circular orifice at the center bottom of the tank. The inner radius of the tank is 134 mm, while there are seven variations of orifice radius, those are 2.25 mm, 2.50 mm, 3.00 mm, 3.50 mm, 4.00 mm, 5.00 mm, and 6.00 mm. The tank is filled by water which is then allowed to flow out throuh the orifice. This experiment can be used to measure the value of gravitational acceleration () on the experiment location. We call this method as the leak tank method. The measurement of g is carried out by measuring the total time to drain the tank from 300 mm initial height of water surface inside the tank for various orifice radius. It is found in this experiment that = (9.89± 0.03) m/s2. This result is good enough because it is almost the same as the conventional standar value of 9.80665 m/s2 with discrepancy of around 0.85%. It indicates that the leak tank method which is described in this paper can be used to estimate the gravitational acceleration value with a good result.

Force concept inventory (FCI) representation of high school students (SMA & MA) Jeffry Handhika; Farida Huriawati; Nur Fitriani
Journal of Physics: Theories and Applications Vol 1, No 1 (2017): Journal of Physics: Theories and Applications
Publisher : Universitas Sebelas Maret

There have been profiling the level of understanding of physics concept (dynamics and kinematics) of students' (SMA and MA) in madiun region. Profiling is done by using the Force Concept Inventory test. Samples were taken from 120 students from SMA and MA in Madiun and Ponorogo. The results indicate that FCI test number 23 and number 16 is the most answered incorrectly by the students. Problem number 23 related to kinematics and test number 16 on Newton's third law. Only 24.16% of students answered correctly test numbers 23 and 25% of students answered correctly test number 16. Students SMA and MA do not understand the concept well and can’t represent concept in another shapes. These results provide an indication that the learning concept needs to be implementation at SMA and MA.

Experimental Study of Resonance Frequency at Prime Mover Thermoacoustic Standing Wave Danang D. Cahyadi; Yoga N. Adhitama; Ikhsan Setiawan; Agung B. S. Utomo
Journal of Physics: Theories and Applications Vol 1, No 2 (2017): Journal of Physics: Theories and Applications
Publisher : Universitas Sebelas Maret

Thermoacoustic prime movers work by using thermal energy to produce acoustic energy in the form of sound wave through thermoacoustic effect which occurs in a porous medium called stack. This paper describes an experimental study on the relation between the order of resonance frequencies generated by a thermoacoustic prime mover and the length of the resonator and the viscous penetration depth. Extending the resonator length will decreasing the resonance frequency which result in the increasing in the viscous penetration depth. Generally, the generated sound consists of only one frequency, that is the first-order one. However, under certain conditions, the sound has only the second-order frequency or comprises two frequencies of the first-order and second-order resonance frequencies. This phenomenon can be explained by considering the comparison between the effective hydraulic radius of stack () and the viscous penetration depth (). It is found that the first-order frequency appears when , while when (with calculated by using the first-order frequency) then the second order frequency is produced so that is back to a smaller value and therefore the condition of is recovered. In addition, when of the thermoacoustic prime mover will generate the first and second order frequencies together.

Optimization of The Mechanical Drive on Set-up of Homemade Surface Plasmon Resonance Muhammad Arifin; Febrilian Dwi Laksono; Supardianningsih Supardianningsih; Kamsul Abraha
Journal of Physics: Theories and Applications Vol 1, No 2 (2017): Journal of Physics: Theories and Applications
Publisher : Universitas Sebelas Maret

Mechanical optimization has been done on the surface plasmon resonance (SPR) homemade. At set-up, angle scanning comes a small resolution to detect changes in the thickness of the thin film or refractive index of the sample. The mechanical drive has a function to rotate the prism and detector. Torsional Spring-Loaded Gear Antibacklash is used to improve the accuracy of the mechanical drive. The stepper motor is used to rotate the mechanical drive automatically. The built system has successfully increased the resolution of the prism rotation angle by 0.01°. The test using the blank prism indicates the angle of Total Internal Reflection occurs at an incident angle of 41.80 °. The SPR phenomenon was observed in a thin layer of gold deposited on the prism using a vacuum evaporator. The observed SPR angles on samples A, B, C, D, E, F, G, H and I were 45.02°, 45.05°, 46.30°, 44.48°, 44.70°, 45.49°, 45.52°, 45.66°, and 44.44°, respectively. The SPR angle change shows the difference in the thickness of the gold thin film.

The application of Scilab software in frequency mode simulation on the circular membrane Dwi Nova Siti Handayani; Yudhiakto Pramudya; Suparwoto Suparwoto; Muchlas Muchlas
Journal of Physics: Theories and Applications Vol 2, No 2 (2018): Journal of Physics: Theories and Applications
Publisher : Universitas Sebelas Maret

Scilab software is utilized for solving physics cases in two dimensional wave equations. This study aims to obtain a frequency mode simulation on the circular membrane so that it can display the wave pattern of each frequency mode. The method is to compare the simulation results with the normal mode circular membrane in each mode in to the theoretical calculation. The simulation has been done by utilizing the physics concept in a wave equation involving cos θ. The function of the wave equation is , assuming that r is the radius of the circle membrane. The value of the vibration frequency mode in theoretical are f01 = (200.6 ± 2.0) Hz, f11 = (319.7 ± 3.1) Hz, f21 = (428.5 ± 4.2) Hz. By using the Scilab program application, the results obtained show that the results frequency mode simulation f01, f11, dan f21 are similar to the normal mode in theoretical calculation. Thus, the simulation can be used to visualize waves of two dimensions in vibration and wave learning.

Fault detection using neural network Elistia Liza Namigo
Journal of Physics: Theories and Applications Vol 1, No 1 (2017): Journal of Physics: Theories and Applications
Publisher : Universitas Sebelas Maret

Fault detection technique using neural networks have been successfully applied to a seismic data volume. This technique is basically creating a volume that highlights faults by combining the information from several fault indicators attributes (i.e. similarity, curvature and energy) into fault occurrence probability. This is performed by training a neural network on two sets of attributes extracted at sample locations picked manually - one set represents the fault class and the other represents the non-fault class. The next step is to apply the trained artificial neural network on the seismic data. Result indicates that faults are more highlighted and have better continuity since the surrounding noise are mostly suppressed.

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Home Page

OAI Link

Editorial Team

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Google Scholar

Contact Name Dewanta Arya Nugraha

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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

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