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:: Abstract List ::
Page 37 (data 1081 to 1092 of 1092) | Displayed ini 30 data/page
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| 1081 |
Physics |
ABS-233 |
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Comparative Analysis of NOAA-11/AVHRR Land Surface Temperature (LST) Algorithm and LST MODIS Data
C E Rustana1)*, A Istikanah1), Trismidianto2) and Risyanto2), A A Saputro1)
1) Department of Physics, Faculty of Mathematics and Natural Science, State University of Jakarta
2) Center For Atmospheric Sciences and Technology, National Institute of Aeronautics and Space
*e-mail : crustana[at]unj.ac.id
Abstract
This research was to analyse the comparation of NOAA-11/AVHRR LST Algorithm and MODIS LST data. The LST Algorithm of AVHRR/NOAA developed by Rustana [1] using split window method of thermal infrared channel 4 and 5 which was validated using Australian LST ground measurement. The algorithm will be applied to the MODIS thermal infrared of channel 31 and 32 data in order to determine LST. This LST measurement will be comparatively analysed with direct LST measurement of MODIS using Python and Origin Pro Software. The result indicated that the LST algorithm measurement of first and second order were linearly best fit with the LST measurement of MODIS data using Python and Origin Pro Software with an accuracy of about 1.5 0C. It can be concluded that the developed LST Algorithm of AVHRR/NOAA can be applied to measure LST in Indonesia.
Keywords: Land Surface Temperature, LST Formula, validation method, Modis Data, Cecep Rustana LST Formula
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| Corresponding Author (Adamul Istikanah)
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| 1082 |
Physics |
ABS-745 |
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Influence of LDA+U on band dispersion in monolayer MCl2 (M: Fe, Co)
Teguh Budi Prayitno, Riser Fahdiran
Universitas Negeri Jakarta
Abstract
We investigated the effect of LDA+U on the band dispersions in 1T monolayer FeCl2 and CoCl2 within the self-consistent noncollinear calculation. As shown in the band dispersion, FeCl2 is metallic while CoCl2 is insulating. When the effective Coulomb energy is taken into account, FeCl2 is metallic without band gap while the band gap in CoCl2 increases as the Coulomb energy increases. Thus, the band gap in CoCl2 can be effectively controlled by the Coulomb energy, thus it is feasible for the spintronic development.
Keywords: Metal dihalides, LDA+U, band gap
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| Corresponding Author (Teguh Budi Prayitno)
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| 1083 |
Physics |
ABS-1001 |
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Assessing two-dimensional collisions second-years students using PhET simulations on momentum and impulse concept
R Adimayuda12*, L Sari1, A Ismail1, I F Amalia1, S Gumilar1, A Samsudin2
1.Institut Pendidikan Indonesia
2.Universitas Pendidikan Indonesia
Abstract
Assessment is an important component in education that always needed. To improve the quality of education can be done by improving assessment learning quality and system. This study aims to determine the performance of students of grade X SMA N in Bandung West Java Indonesia school with 34 participants on a two-dimensional collision concept. This research is descriptive research which is conducted to examine the condition and situation that is happening, so that gives a fact-based description found in the school in other to find information factually. Problem studies that analyzed are the students performance after using PhET simulations on two-dimensional collision concept. The instrument utilized in this study is a written test in the form of students’ worksheets of momentum and impulse. Student worksheets test shows the average percentage on student performance in understandings concept of two-dimensional collision concept is 67.14%. These data indicated that student learning performance in good category. Learning by using virtual laboratory can provide more meaningful learning especially in physics concept that cannot be presented and observed directly in daily life
Keywords: Assessment, PhET Simulation, momentum and impulse
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| Corresponding Author (Rizal Adimayuda)
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| 1084 |
Physics |
ABS-234 |
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Brightness Temperature Estimation Based on MODIS Data in Infrared Canal and Application for Haze Detection
C E Rustana1)*, A A Saputro1), Trismidianto2) and Risyanto2), A Istikanah1)
1) Department of Physics, Faculty of Mathematics and Natural Science, State University of Jakarta
2) Center For Atmospheric Sciences and Technology, National Institute of Aeronautics and Space
*e-mail: crustana[at]unj.ac.id
Abstract
This research was estimated the brightness temperature and find out how the surface temperature is occurring and its spread. In determining the estimation of temperature brightness using the Multi-Channel method. The results of this research are on data obtained from NASAs websites different from the data contained in the LAPAN website. The LAPAN data already has a brightness temperature value, while in NASA data there is only radians value. To find out using the Planck constant formula. Spatial results are the same between NASA data and LAPAN data. Data used from 15 – 16 July 2018 and 6 – 7 August 2019. The spatial results on channels 22 – 23 have a lot of contact between the basic surface, fog, sand storm, and smoke values. Whereas in the 31 – 32 channel, which can be known as the intersection of fog and clouds.
Keywords: fog, smoke, satellite, digital imagery, spatial, MODIS
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| Corresponding Author (Adamul Istikanah)
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| 1085 |
Physics |
ABS-748 |
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Dynamical system of relativistic particle under one-dimensional harmonic oscillator potential
Teguh Budi Prayitno, Widyanirmala, I Made Astra
Universitas Negeri Jakarta
Abstract
Dynamical system of a relativistic particle under harmonic oscillator potential was considered through its stability. We first construct the Hamiltonian of the system, which represents the dynamic motion of the relativistic particle. The stability of the system was then determined by the singular point. We found that the relativistic motion under the harmonic oscillator is a stable system where the phase curve forms an ellipse.
Keywords: Dynamical System, Relativistic Particle, Harmonic Oscillator
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| Corresponding Author (Teguh Budi Prayitno)
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| 1086 |
Physics |
ABS-749 |
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Brief notes of implementation of generalized Bloch theorem in fcc iron: a linear combination of pseudo-atomic orbitals method
Teguh Budi Prayitno
Universitas Negeri Jakarta
Abstract
We briefly discussed the spiral ground state in fcc iron using the generalized Bloch theorem combined by a linear combination of pseudo-atomic orbitals basis sets. We used one magnetic iron atom in the unit cell with a 90o direction of magnetic moment as an initial ferromagnetic state. We observed different position of spiral ground states for several lattice constants. For the small lattice, the low spin state appears while the high spin state emerges in the higher lattice. This means that the spiral ground state as well as the spin state depend on the lattice constant.
Keywords: spin spiral, iron, generalized Bloch theorem
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| Corresponding Author (Teguh Budi Prayitno)
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| 1087 |
Physics |
ABS-750 |
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Energy momentum tensor of scalar field with higher order derivatives
Teguh Budi Prayitno, Esmar Budi, Riser Fahdiran
Universitas Negeri Jakarta
Abstract
We considered a formulation of the energy momentum tensor of scalar field containing higher-order derivatives. Starting from the Lagrangian density, we can formulate the Hamiltonian density as well as the three-component momentum density by applying the total variation on the field. We claimed that this formulation can be used to derive some nonlinear wave equations, such as the KdV equation and the Burgers equation.
Keywords: Lagrangian density, higher-order derivative, scalar field
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| Corresponding Author (Teguh Budi Prayitno)
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| 1088 |
Physics |
ABS-751 |
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Electric-field-induced lowest state in bilayer zigzag graphene nanoribbon
Teguh Budi Prayitno, Esmar Budi
Universitas Negeri Jakarta
Abstract
We investigated the lowest state in the bilayer zigzag graphene nanoribbon by taking the electric field into account. In this calculation, we considered five collinear configurations of magnetic moment of carbon atoms at the four edges. We found that the lowest state changes as the electric field is applied. This suggests that the lowest state is not robust to the electric field so that the electric field can control the lowest state in the bilayer zigzag graphene nanoribbon.
Keywords: graphene nanoribbon, electric field
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| Corresponding Author (Teguh Budi Prayitno)
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| 1089 |
Physics |
ABS-243 |
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Preliminary Study as an Exploration Activity for Estimating Insitu Coal Density Using the Correlation of Seismic Downhole and Geology Drilling
R D Agustina (1*), H Pazha (2)
(1)Physics Education Study Program, UIN Sunan Gunung Jati, Jl. AH. Nasution No. 105, Bandung 40 614, Indonesia
*renadenya[at]uinsgd.ac.id
(2)PT Geocipta Bangun Optima, Jl Golf III Block .IV No 26, Arcamanik, Ujungberung, Bandung
Abstract
The need for coal is increasing every year, so that coal exploration activities need to be done to maintain the availability of these materials. Exploration activities generally use the correlation of geological method (analysis) and direct measurement using the geophysical method. One of the geophysical methods used is the downhole seismic method, to determine the quality of coal hardness through several seismic parameters, namely variations in the value of the initial wave velocity (Vp & Vs) and the wave travel time (Tp & Ts). This study aims to estimate insitu coal density and avoid mining land clearing and environmental destruction that are misplaced. This exploration activity is carried out at 6 measurement points.
Keywords: coal exploration,downhole seismic method, geological method,initial wave velocity
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| Corresponding Author (Rena Denya Agustina)
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| 1090 |
Physics |
ABS-755 |
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Physical problem in interpreting classical energy of soliton of sine Gordon equation
Teguh Budi Prayitno, Esmar Budi, Sunaryo, Riser Fahdiran
Universitas Negeri Jakarta
Abstract
The classical energy of soliton of sine Gordon equation was evaluated analytically by using the Hamiltonian density. We classify the condition at which the energy will be either convergent or divergent. For the convergent energy, we also impose the condition at which the energy is real. We justify that there is a satisfied condition to obtain the real energy.
Keywords: sine-Gordon, soliton
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| Corresponding Author (Teguh Budi Prayitno)
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| 1091 |
Physics |
ABS-1014 |
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Development of Microcontroller-based Beats Frequency Practicum Device
Widyaningrum Indrasari, Cecep E Rustana, Fathul Arifin
Program Studi Fisika and Pendidikan Fisika, FMIPA, Universitas Negeri Jakarta
Abstract
A practicum device of beats frequency has been developed. The device composes of AD9833 module as artificial sound frequency source, microcontroller type of Arduino Uno as a control system, and application as the output’s display. The module produces adjustable frequency of sound in real time. Then this frequency sources are connected to adjustable speaker stereo as the sound’s output. The instrument available produces frequencies from 0.1 Hz to 2500 Hz with a stepping frequency of 0.1 Hz. Frequency calibration is carried out using a frequency audio counter, in the frequency range of 300 Hz - 500 Hz. The smallest beats frequency that can be observed is 0.1 Hz.
Keywords: beats frequency, AD9833, audacity
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| Corresponding Author (Widyaningrum Indrasari)
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| 1092 |
Physics |
ABS-249 |
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Doppler Effect experiment using PhyPhox® application and Pendulum
Sarah Puspitasari, Primaswari Eka Anggraini, Aidha Ratna Fajarini Sidik, Bebeh Wahid Nuryadin*
Department of Physics, UIN Sunan Gunung Djati Bandung
Abstract
This study aims to observe changes in frequency (Doppler effect) due to harmonic oscillation motion (pendulum) using the PhyPhox® application. In general, this experimental device consists of two smartphones as a sound source and detector, and a pendulum (rope @ 2m). First, the sound source (1 kHz) is hung as a load on the pendulum. Whereas the sound detector uses the PhyPhox® application on the second smartphone which is placed statically around the pendulum. Then, the pendulum is distorted and swung with some variation in height (angle), so the pendulum can move at oscillating speed. The observations show that the sound frequency varies due to the Doppler effect, with the detected frequency oscillating between the minimum frequency (fmin) and the maximum (fmax). For the height deviation of the pendulum 20 cm and a base frequency of 1 kHz, it was observed that fmin and fmax were 996,97 Hz and 1003,26 Hz, which showed that the maximum speed of the sound source was ±1,1 m/s. These observations are in accordance with theoretical analysis which estimates the deviation of the pendulum height of 20 cm will produce a maximum velocity for 1 m/s. The development of observing the Doppler effect using the PhyPhox® application and pendulum is expected to be able to facilitate students in understanding the wave phenomena and harmonic oscillation motion.
Keywords: Doppler effect, wave phenomena, harmonic oscillation, PhyPhox® application
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| Corresponding Author (Bebeh Wahid Nuryadin)
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