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Spektra: Jurnal Fisika dan Aplikasinya

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Published by Universitas Negeri Jakarta

ISSN : 25413384 EISSN : 25413392 DOI : -

Core Subject : Science, Engineering,

Aerospace Engineering Electrical & Electronics Engineering Energy Materials Science & Nanotechnology Physics

Arjuna Subject : -

Articles 260 Documents

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THE SIMULATION AND DATA ANALYSIS OF TEMPERATURE SENSOR Hilal Fauzi Ramadhan; Retno Dwi Kartika Sari; Adnan Prasetyo Alamsyah; Adrian Fadhillah; Rizki Nurhikmah; Sarah Aribah Miftahulfallah; Widya Rahma; Ari Firia; Dea Amelia Saputri; Irmansyah Irmansyah; Irzaman Irzaman
Spektra: Jurnal Fisika dan Aplikasinya Vol 6 No 2 (2021): SPEKTRA: Jurnal Fisika dan Aplikasinya, Volume 6 Issue 2, October 2021
Publisher : Program Studi Fisika Universitas Negeri Jakarta

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.21009/SPEKTRA.062.06

The study have successfully simulated 40 units data of temperature sensor during heating process and cooling process. Simulated data in temperature sensor has interval time 3 to 18 seconds for 5 iterations that are combined with other 7 data temperature sensor until get 40 data iterations. The data which has been simulated and then plotted into a graph with the x-axis is time and y-axis is average heating process or cooling process. The graph formmed cupped-down with quadratic function for heating process and cupped-up for cooling process.

THE PARAMETER ANALYSIS OF CUBICAL STRUCTURED CADMIUM TELLURIDE (CdTe) SEMICONDUCTOR MATERIALS Sinta Puspita Apriliani; Susi Susilawati; Koharudin Koharudin; Sarah Nabilah; Dwi Lestariningsih; Witri Desmulyani; Anis Munir Rukyati; Muhammad Fikri Fakhrurozi; Stefiana Sondary Az Zahrah; Irmansyah Irmansyah; Irzaman Irzaman
Spektra: Jurnal Fisika dan Aplikasinya Vol 6 No 2 (2021): SPEKTRA: Jurnal Fisika dan Aplikasinya, Volume 6 Issue 2, October 2021
Publisher : Program Studi Fisika Universitas Negeri Jakarta

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.21009/SPEKTRA.062.05

Cadmium telluride (CdTe) semiconductor materials will be used to analyze the energy gap, lattice parameters, and error value of these cubical structured crystal materials. The data that we used to be analyzed is using data from the International Center for Diffraction Data (ICDD) that used the X-ray Diffraction (XRD) method. This research has been successfully analyzing energy gap, lattice parameters, and the error value of Cadmium telluride (CdTe) materials which have a cube-shaped crystal structure. The result of the gap energy analysis of Cadmium telluride (CdTe) with a cubical structure yields a value of 1.43 eV. The lattice parameters of Cadmium telluride (CdTe) with a cubical structure analyzed by the Cramer-Cohen method yields a value of a = b = c = 9.922 Å. The error value of Cadmium telluride (CdTe) with a cubical stcucture yields a value of 6.75 x 10-4 %.

NUMERICAL ANALYSIS OF ELECTRIC FORCE DISTRIBUTION ON TUMOR MASS IN DC ELECTRIC FIELD EXPOSURE Muhammad Arif; Warsito Purwo Taruno; Septelia Inawati Wanandi; Anto Sulaksono
Spektra: Jurnal Fisika dan Aplikasinya Vol 6 No 2 (2021): SPEKTRA: Jurnal Fisika dan Aplikasinya, Volume 6 Issue 2, October 2021
Publisher : Program Studi Fisika Universitas Negeri Jakarta

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.21009/SPEKTRA.062.01

Researchers have used electric fields as a new therapeutic strategy to treat cancer for the past 15 years. Tumor Treating Fields (TTFields) is an alternating electric field-based cancer therapy approved by the US FDA to treat glioblastoma multiforme (GBM). ECCT (Electro-Capacitive Cancer therapy), a DC charged-discharged electric field (EF) cancer therapy, also shows a performance inhibiting cell proliferation. ECCT affects the cancer lesions to cause simultaneous death of the cancer cell and detached off of the surrounding tissue. The author hypothesizes that the EF produces an electric force that is not homogeneous throughout the tumor mass and generates a strong dielectrophoresis force. The force affects microtubules polymerization during mitosis and causes mitotic arrest. To examine this hypothesis, we performed a numerical simulation of the EF distribution and calculated the force acting on the tumor mass generated by the EF. We analyzed DC electric field exposure on a cancer lesion using a single lesion 2D circular model, calculated the EF intensity on the lesion using the Finite Element Method, and the dielectrophoresis force distribution to quantify the treatment efficacy. The results showed that the distribution of EF intensity was not homogeneous at the lesion-medium boundary and homogeneous within the lesion. The EF intensity is highly dependent on the dielectric constant of the medium and the applied voltage difference that may affect the effectiveness of the treatment. Variations in lesion diameter had no significant effect on the EF intensity distribution and, hence the effectiveness of the therapy. It is considered that EF exposure by ECCT generated strong force on the lesion-medium boundary that could cause detachment of the tumor mass from the surrounding tissue.

STUDY OF THE EFFECT OF MAGNETIC FIELDS ON ELECTROENCEPHALOGRAPHY MEASUREMENT IN FARADAY’S CAGE Galih Restu Fardian Suwandi; Siti Nurul Khotimah; Freddy Haryanto; Suprijadi Suprijadi
Spektra: Jurnal Fisika dan Aplikasinya Vol 6 No 2 (2021): SPEKTRA: Jurnal Fisika dan Aplikasinya, Volume 6 Issue 2, October 2021
Publisher : Program Studi Fisika Universitas Negeri Jakarta

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.21009/SPEKTRA.062.02

Electroencephalography (EEG) is a method for recording the brain's electrical activity through electrodes placed on the scalp's surface. The amplitude of the EEG signal is in the 40–100 V range, with the five main frequencies in the 0 to 100 Hz range. The EEG is non-stationary and very susceptible to various disturbances, especially frequency disturbances, so eliminating troubles in the raw EEG data is essential to obtain helpful information reflecting brain activity. Interference in the EEG signal comes from muscles, eye movement and blinking, power lines, and interference with other devices. The distractions overlap. Shielding is required to perform an EEG without the risk of interference and ambient background noise. This study tested how the influence of magnetic field disturbances on EEG measurements was carried out in the Faraday cage and an unprotected room. The magnetic field was measured before, during, and after the EEG was operated. EEG measurements were performed on subjects who were conditioned to rest for 5 minutes. The EEG signals generated when EEG recordings were performed in the Faraday and the unprotected rooms were compared. It was found that the difference in the value of the magnetic field originating from electronic devices around the subject does not significantly affect the EEG measurement results.

THE RELATIONSHIP BETWEEN TIME AND WATER CONTENT OF FISH DRIED USING SOLAR PANEL-BASED DRYERS Sutrisno Sutrisno; Rindang Wahyu Puspitasari; Anang Pamungkas; Daeng Achmad Suaidi
Spektra: Jurnal Fisika dan Aplikasinya Vol 6 No 3 (2021): SPEKTRA: Jurnal Fisika dan Aplikasinya, Volume 6 Issue 3, December 2021
Publisher : Program Studi Fisika Universitas Negeri Jakarta

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.21009/SPEKTRA.063.04

Traditional drying of fish, the water content produced is not in accordance with SNI (Indonesian National Standard), which is less than 40%. This research aims to determine the correlation between time and water content of fish dried with an electric-based fish dryer produced from solar panels. The method used is a quantitative method. The solar panel-based electric fish dryer has a maximum capacity of 2237 grams (12 fish) with a temperature above 30°C. Based on the data analysis, the correlation between time and water content was obtained, the results for the 1st, 2nd and 3rd experiments, the average correlation coefficient was R² = 0.99, and the correlation between the mass of dried fish and the water content of fish, the more mass of fish that is dried the more water content evaporates (dry), To meet the water content of fish that is permitted according to SNI, which is less than 40%, it takes a long time to dry. about 4 days. The heating system in the drying chamber was based on the first experiment until the third experiment, the heat was evenly distributed and quite good in the drying chamber, so that the temperature control system worked well. This solar panel-based fish drying system can be used by fishermen to lighten fish in improving the quality of their products according to SNI.

LINEAR GENERATOR PROTOTYPE WITH VERTICAL CONFIGURATION OF SEA WAVE POWER PLANT Prasetyowati, Ane; Broto, Wisnu; Suryaningsih, Noor
Spektra: Jurnal Fisika dan Aplikasinya Vol. 6 No. 3 (2021): SPEKTRA: Jurnal Fisika dan Aplikasinya, Volume 6 Issue 3, December 2021
Publisher : Program Studi Fisika Universitas Negeri Jakarta

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.21009/SPEKTRA.063.05

There are three types of potential energy sources in the sea: ocean wave energy, tidal energy, and ocean heat energy. Ocean wave energy is a source of considerable energy. Sea waves are an up and down movement of seawater where the energy of sea waves is generated through the effect of air pressure movement due to fluctuations in ocean wave movements. The Ocean Wave Power Plant can use ocean wave energy to convert it into electrical energy. A linear generator is a device that can convert the mechanical energy of linear motion into electrical energy. The application of the ocean wave energy conversion technology, a linear generator system is an electrical machine that functions to convert the mechanical energy of linear motion into electrical energy using the principle of electromagnetic induction. Wave Energy Converter (WEC) technology has been developed with various methods. From the various existing concepts and designs, in general, WEC technology can be classified into three main types, namely Attenuator (horizontal configuration), Point Absorber (linear configuration), Terminator (damping configuration).

WORKING ANALYSIS OF SPACE TIME TRELLIS CODE ON WIFI MIMO(2X2) SYSTEM OFDM Broto, Wisnu; Suryaningsih, Noor; Mahendra, Adhi
Spektra: Jurnal Fisika dan Aplikasinya Vol. 6 No. 3 (2021): SPEKTRA: Jurnal Fisika dan Aplikasinya, Volume 6 Issue 3, December 2021
Publisher : Program Studi Fisika Universitas Negeri Jakarta

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.21009/SPEKTRA.063.03

Wireless communication nowadays requires a system with reliable performance, efficient use of bandwidth, efficient power, and better coverage because it is in line with human needs for applications that require high and fast data rates. One of the concepts and methods to meet these needs is using an antenna technique with many transmitters and receivers or often called Multiple Input Multiple Output (MIMO), by adding a strategy at the time of delivery, namely the Space-Time Coding (STC) technique. In addition, the application of Orthogonal Frequency Division Multiplexing (OFDM) on MIMO-STC will more efficiently use bandwidth. The Space-Time Trellis Code (STTC) method is one of the diverse techniques in sending data with complex coding so that coding reinforcement is achieved and applied to the OFDM MIMO system. It is hoped that a system with reliable performance can be achieved. The simulation that is carried out presents the STTC and OFDM schemes on multi antennas (2 transmitters x 2 receivers) with a Combiner and Maximum Likelihood Sequence Estimator (MLSE) detection algorithm on the receiver. It is to get the quality of the sending signal in the performance analysis of Bit Error Rate (BER) with Signal to Noise Ratio (SNR). The simulation results are shown by modulation with M-array Phase Shift Keying (MPSK) and the number of symbols sent by giving different input parameter values. The results show that the number of carriers and the size of the Fast Fourier Transform (FFT) is large, and the modulation type with a small constellation produces a low BER and throughput at high SNR.

DETECTION AND MONITORING SYSTEM ON THE PACKAGE RECEIVING BOX Sasmojo, Duta Widhya; Broto, Wisnu; Renaldi , Doni Chesa
Spektra: Jurnal Fisika dan Aplikasinya Vol. 6 No. 3 (2021): SPEKTRA: Jurnal Fisika dan Aplikasinya, Volume 6 Issue 3, December 2021
Publisher : Program Studi Fisika Universitas Negeri Jakarta

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.21009/SPEKTRA.063.02

The package delivery system during this pandemic period require concerned health protocols. Receiving packages sometimes needs to be done even though there is no recipient. Here, the box for receiving goods has an important role. The goods receiving box must have security and ensure that the goods are received/placed in the box. In this case, it is necessary to detect the presence of objects in the box using a weight sensor, and a box locking motor is also needed. A push-button is needed when the package items are put into the box. The process of this activity can be monitored directly with the help of the Blynk application from a smartphone. The tests are carried out, and the push button signals to open the box. The weight sensor detects weight changes. The Blynk application will inform the smartphone that the object has been placed in the box from the weight change, and the system will lock the box again. The detection and monitoring system for goods on the box can work well.

THE OPERATIONAL MODE OF OPTICAL MICROSCOPE APPLYING PHOTONIC JET MICROSCOPY Andri Abdurrochman; Julian Akmal S; Ela Septianingsih; Intan F. Amatillah; L. Safriani
Spektra: Jurnal Fisika dan Aplikasinya Vol 6 No 2 (2021): SPEKTRA: Jurnal Fisika dan Aplikasinya, Volume 6 Issue 2, October 2021
Publisher : Program Studi Fisika Universitas Negeri Jakarta

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.21009/SPEKTRA.062.03

The previous experimental research on microsphere parameters applying photonic jet microscopy in free space revealed if the relative indexes come near to two, it needs larger microspheres. It also means if the relative indexes come near to one, it needs smaller microsphere. In addition to these premises, the mode of ordinary optical microscope introducing photonic jet microscopy in its operation must be taken into account. That includes the light source or filter, and the fluidic environment - free space or immersion oil. These additional modes are predicted in two dimensional finite element method calculation. Which leads to more practical use of photonic jet microscopy in the near future.

SPECTROSCOPIC AND RADIATIVE PROPERTIES OF SM3+ DOPED SODIUM-LEAD-ZINC-LITHIUM-BORATE GLASSES Donna Rajagukguk; Juniastel Rajagukguk; Pintor Simamora; Rappel Situmorang; Chayani Sarumaha; Widyaningrum Indrasari
Spektra: Jurnal Fisika dan Aplikasinya Vol 6 No 3 (2021): SPEKTRA: Jurnal Fisika dan Aplikasinya, Volume 6 Issue 3, December 2021
Publisher : Program Studi Fisika Universitas Negeri Jakarta

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.21009/SPEKTRA.063.01

The glasses with a composition of (65 - x) B2O3 – 5ZnO – 5Li2O – 15 Na2O – 10PbO – x Sm2O3 (x = 0.0; 0.05; 0.1; 0.5; 1.0; 2.0 and 4.0 mol.%) which has been prepared using the melt quenching technique (1100oC for 3 hour). The spectroscopic properties can be determined by investigating the absorption, excitation, and emission spectra of a glass sample. There are 14 centered absorption bands starting from 6H5/2. The excitation spectrum of the Sm3+ doped borate glasses was measured at the wavelength of 300-550 nm which is the strongest intensity (4F7/2 at 403 nm) used as the excitation wavelength to measure the glass emission spectrum. The emission peaks transition starts from 4G5/2. The Judd-Ofelt theory has been applied to the absorption spectrum of Sm3+ doped borate glass to estimate the intensity parameters (Ωλ, λ = 2, 4 and 6) which are then used to calculate the radiative properties. The energy of the optical bandgap is in the range 3.85-3.77 eV for direct transitions and 3.42 - 4.22 eV for indirect transitions. The decay times obtained were 3.42, 3.99, 3.98, 2.96, 1.67, 1.48 ms for 0.05 - 4.00 mol%. Using the CIE chromaticity diagram for borate glass it can be determined that the glass from this work has a high performance for use as an orange emitting material application.

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