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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

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Articles 260 Documents

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FRONT MATTER SPEKTRA VOLUME 6 ISSUE 2, OCTOBER 2021 Editor Spektra
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.06200

BACK MATTER SPEKTRA VOLUME 6 ISSUE 2, OCTOBER 2021 Editor Spektra
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.062111

FRONT MATTER SPEKTRA VOLUME 6 ISSUE 3, DECEMBER 2021 Editor Spektra
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.06300

BACK MATTER SPEKTRA VOLUME 6 ISSUE 3, DECEMBER 2021 Editor Spektra
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.063111

IDENTIFICATION OF SOIL CORROSION POTENTIAL FOR PLANNING IN THE GAS PIPELINE CATHODIC PROTECTION SYSTEM Agus Solehudin; Enda Permana; Haipan Salam
Spektra: Jurnal Fisika dan Aplikasinya Vol 7 No 1 (2022): SPEKTRA: Jurnal Fisika dan Aplikasinya, Volume 7 Issue 1, April 2022
Publisher : Program Studi Fisika Universitas Negeri Jakarta

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.21009/SPEKTRA.071.03

Research has been carried out to map and identify the potential for soil corrosion for the planning of cathodic gas pipeline protection systems. The research location is located in Cimanggis - Bitung, West Java, which is located at coordinates 6o19'00 "- 6o28'00" South Latitude and 106o43'00 "- 106o 55'30" East Longitude. Measurement of soil resistivity using the Wenner method that refers to ASTM G37, with variations in the distance of 0,75m, 1,50m, 2,50m and 6,00m with the number of measuring points as many as 185 points. Based on the results of data processing and soil resistivity interpretation seen that there are several locations that have low to extreme corrosion levels. Therefore, for these locations, technical planning and calculation for the protection of the pipeline to be installed is necessary.

STUDY OF CRUSTAL STRUCTURE OF THE FLORES ISLAND USING RECEIVER FUNCTION METHOD Nanda Dewi Pamungkas Siwi; Ramadhan Priadi; Puji Ariyanto
Spektra: Jurnal Fisika dan Aplikasinya Vol 7 No 1 (2022): SPEKTRA: Jurnal Fisika dan Aplikasinya, Volume 7 Issue 1, April 2022
Publisher : Program Studi Fisika Universitas Negeri Jakarta

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.21009/SPEKTRA.071.01

Flores is an island located in the north of the East Nusa Tenggara region. Formed as a consequence of very complex tectonic setting that might cause relatively high level of seismic in the region. This study aims to characterize the crust structure based on the S wave velocity model, the Vp/Vs ratio, and crustal thickness beneath the station on Flores Island. This study was using receiver function analysis method of teleseismic earthquake data with magnitude criteria ≥ 6 and epicenter distance 30⁰-90⁰. Seismic signal recorded on broadband stations three components. This study was using LBFI station. Velocity model of S wave and Vp/Vs ratio determined by using the non-linear Neighbourhood Algorithm (NA) inversion. Furthermore, the velocity and Vp/Vs ratio models will be used to obtain the depth of the migration process of the amplitude of the receiver function to depth. From the results of processing the depth of the Moho layer on the island of Flores under the LBFI station was identified as 41 km. The existence of the slab can be identified quite well that is at depth about 110 to 140 km.

THE EFFECT OF VARIATION CONCENTRATION AND DEPOSITION PARAMETER TO THE OPTICAL CHARACTERISTICS AND THE CRYSTALLITE PROPERTIES OF ZINC OXIDE Waode Sukmawati Arsyad; Ulpiani Ulpiani; Muh. Angga Anugerah; La Aba; Ida Usman
Spektra: Jurnal Fisika dan Aplikasinya Vol 7 No 1 (2022): SPEKTRA: Jurnal Fisika dan Aplikasinya, Volume 7 Issue 1, April 2022
Publisher : Program Studi Fisika Universitas Negeri Jakarta

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.21009/SPEKTRA.071.04

The objective of the study was to obtain the ZnO thin films with variation concentration of zinc acetate dehydrate (ZAD), and variation of spin coater speed and rotation time. We observed the effect of the former parameters on the optical characteristics that comprised of the spectrum of absorption, transmittance, and ZnO crystallite size from UV-Vis spectrometer and XRD orderly. For the analysis of the effect of the variation of concentration, ZAD diluted into ethanol with the concentration 0.1M, 0.25M, 0.5M, 0.75M and 1M, with the addition of diethanolamine (DEA). Then it was deposited on the glass substrate with spin coater, continued by the heating on the hotplate with the number of layer's variation. For the analysis of deposition parameter effect on the transmittance and the size of ZnO crystal, we used 0.25M ZnO precursor solution with the addition of DEA, then deposited by speed and time of rotation of spin coater of 1230 rpm, 2500 rpm, and 3200 rpm for 10, 15 and 30 seconds of each. The smallest absorbance value 0.05 obtained for single layer 0.1M ZnO, while the maximum transmittance value obtained for three-layer 0.25M ZnO. Concentration variation did not affect the energy gap, whose value was approximately 3.2 eV for all samples. From the XRD result, we found that deposition time affected the number of diffraction lines, the size of the crystallite, and the transmittance.

THE ANALYSIS OF SOUND TRANSMISSION LOSS ON LAMINATED GLASS Fajar Budi Utomo; Bondan Dwi Setyo; Maharani Ratna Palupi; Chery Chaen Putri; Ninuk Ragil P.; Dodi Rusdjadi T. E.; Denny Hermawanto
Spektra: Jurnal Fisika dan Aplikasinya Vol 7 No 1 (2022): SPEKTRA: Jurnal Fisika dan Aplikasinya, Volume 7 Issue 1, April 2022
Publisher : Program Studi Fisika Universitas Negeri Jakarta

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.21009/SPEKTRA.071.05

Laminated glass is one type of glass that is commonly used for sound insulation (walls or doors). Tests related to the ability of insulating glass in Indonesia are still sporadic. One of the places to do this test is the SNSU BSN Lab. This Lab has a function to perform sound insulation level measurements commonly known as Sound Transmission Class (STC) and maintain to trace the ability of acoustic measurements. This paper describes the characteristics of Sound Transmission Loss (STL) of 12mm laminated tempered glass. The sample measurement method refers to ISO 10140-1 using two chambers (source and receiver room). Based on the study results, it was found that the laminated tempered glass sample was not good at reducing sound at low frequencies and tended to be good at high frequencies.

FRONT MATTER SPEKTRA VOLUME 7 ISSUE 1, APRIL 2022 Editor Spektra
Spektra: Jurnal Fisika dan Aplikasinya Vol 7 No 1 (2022): SPEKTRA: Jurnal Fisika dan Aplikasinya, Volume 7 Issue 1, April 2022
Publisher : Program Studi Fisika Universitas Negeri Jakarta

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.21009/SPEKTRA.07100

CHARACTERIZATION OF (Mg0.6Zn0.4)TiO3 CERAMICS AS DIELECTRIC RESONATOR MATERIALS IN MICROWAVE FREQUENCIES Syah Nanta Maulana Ishak; Frida Ulfah Ermawati
Spektra: Jurnal Fisika dan Aplikasinya Vol 7 No 1 (2022): SPEKTRA: Jurnal Fisika dan Aplikasinya, Volume 7 Issue 1, April 2022
Publisher : Program Studi Fisika Universitas Negeri Jakarta

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.21009/SPEKTRA.071.02

Ceramics based on magnesium titanate (MgTiO3) are dielectric materials that have the potential to be used in telecommunications systems at microwave frequencies, such as filters, antennas, and signal generators. This study aims to characterize the resonant frequency and output power of (Mg0.6Zn0.4)TiO3 ceramics (abbreviated MZT04) as a dielectric resonator (DR) material in a DRO circuit and relate it to the structure, microstructure, and bulk density data of the ceramics. The MZT04 ceramics were fabricated by compacting MZT04 powder at a pressure of 2.5 MPa using a cylindrical die press of 5 mm in diameter to become pellets with the same diameter. The pellets were sintered at 1300 ℃ by varying holding time for 6, 8, and 10 h to become ceramics. Data on the structure of the ceramics were obtained from the X-Ray Diffraction (XRD) pattern with Cu-Kα radiation which showed that the three ceramics contained MgTiO3 phase, each 87.02; 90.55; and 87.40 % molar, the rest % is MgO and TiO2 rutile phases. The increase in sinter holding time has increased the unit cell volume of the MgTiO3 phase from (307.94), (308.61), to (308.94) Å3; the size of the lattice parameters (a=b, c) also increased from (5.057, 13.903) Å, (5.058, 13.903) Å, to (5.061, 13.914) Å; like wise, the bulk density increased from 2.51, 2.82, and 3.04 g/cm3. As a DR material, the three ceramics exhibit a resonant frequency signal each at 5.20; 5.21; and 5.22 GHz with the output power of -19.70; -14.47; -15.70 dBm, and the FWHM of the signal is 59.3; 61.6; and 61.2 MHz. Therefore, MZT04 ceramics can be applied as the DR material in microwave frequencies, especially at ~5.20 GHz. The variations in sinter holding time is not significant effect on the position of the resonant frequency.

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