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All Journal Komunikasi Fisika Indonesia Jurnal Fisika Unand JOURNAL ONLINE OF PHYSICS COMPTON: Jurnal Ilmiah Pendidikan Fisika Jurnal Pengabdian Masyarakat Pinang Masak
Tika Restianingsih
UNIVERSITAS JAMBI
Chemical Engineering, Chemistry & Bioengineering Chemistry Civil Engineering, Building, Construction & Architecture Earth & Planetary Sciences Education Electrical & Electronics Engineering Energy Engineering Materials Science & Nanotechnology Mathematics Physics

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Journal : JOURNAL ONLINE OF PHYSICS

 1 
EFEK SERETAN KERANGKA INERSIAL DI DALAM MEDAN BINTANG NEUTRON YANG BEROTASI DAN STASIONER Tika Restianingsih; Muhammad Farchani Rosyid
JOURNAL ONLINE OF PHYSICS Vol. 5 No. 2 (2020): JOP (Journal Online of Physics) Vol 5 No 2
Publisher : Prodi Fisika FST UNJA

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.22437/jop.v5i2.9401

Abstract

The inertial frame dragging effect of rotating neutron star has been studied. Inertial frame dragging effect, also well known as Lense Thirring effect, has been predicted using general theory of relativity in 1918. When the neutron star rotates very quickly, the space time around it will be dragged to the direction of the rotation. The Lense Thirring effect is small enough for small objects so it will be clearly seen for massive objects like compact stars, especially neutron star. Later, we derive the equation of frame dragging rate () inside the rotating neutron star, which is axisymmetrik and stationary. Frame dragging rate is decreasing from the center to the surface of stars. It is also noted that is proportional to the angular velocity of star.
PENGUJIAN SISTEM KENDALI TEMPERATUR PADA SISTEM OTOMATISASI TUNGKU PEMBAKARAN PRODUKSI BIOCHAR Nurhidayah Nurhidayah; Tika Restianingsih; Frastica Deswardani; Mardian Peslinof; M.Ficky Afrianto; Jesi Pebralia
JOURNAL ONLINE OF PHYSICS Vol. 6 No. 2 (2021): JOP (Journal Online of Physics) Vol 6 No 2
Publisher : Prodi Fisika FST UNJA

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.22437/jop.v6i2.13133

Abstract

Telah dilakukan pengujian akurasi sistem kendali temperatur pada tungku pembakaran produksi biochar. Pengujian ini bertujuan untuk mengetahui keakuratan sistem kendali temperatur pada tungku pembakaran produksi biochar. Metode pengujian yang dilakukan yaitu dengan cara mengatur suhu tungku pembakaran pada temperatur maksimal yaitu sebesar 4000C. Berdasarkan pengujian yang telah dilakukan diperoleh bahwa sistem dapat bekerja dengan baik sampai mencapai dimana tingkat keakuratan maksimal yang diperoleh sebesar 99%.
APLIKASI SENSOR KELEMBABAN DAN FLEX SENSOR BERBASIS ARDUINO UNO UNTUK SISTEM PENDETEKSI LONGSOR Rustan Rustan; Jesi Pebralia; Tika Restianingsih; Frastica Deswardani; Mardian Peslinof; Nurhidayah Nurhidayah; Iful Amri
JOURNAL ONLINE OF PHYSICS Vol. 7 No. 1 (2021): JOP (Journal Online of Physics) Vol 7 No 1
Publisher : Prodi Fisika FST UNJA

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.22437/jop.v7i1.14805

Abstract

Early detection of landslides is very important to minimize the number of deaths. Technological developments allow humans to predict the signs of landslides more accurately, quickly, and scientifically. In this study, sensors were tested to measure landslide disaster parameters, namely humidity sensors to measure soil moisture and flex sensors to measure soil movement. The sensor is controlled using a microcontroller Arduino Uno. A functionality test was carried out to test the ability of the sensors. The functionality test was carried out using the unit testing method. The unit testing method is carried out by comparing the functional test results of each sensor to the expected response. The moisture sensor functionality test shows that the sensor is able to respond to changes in water content in the soil with changes in voltage. The linear equation resulting from the calibration of the humidity sensor is y = -0.126x + 2.666 with R2 = 0.871. The flex sensor functionality test shows that the sensor is able to detect soil movement in the presence of changes in voltage. The linear equation resulting from the flex sensor calibration is y = -2.861x + 2507 with R2 = 0.964. This shows that the humidity sensor and flex sensor are good enough to be applied in the design of a landslide detection system.
CHARACTERIZATION OF HYDROXYAPATITE FROM CHANNA STRIATA AND SCOMBEROMORUS COMMERSON FISH BONE BY HEAT TREATMENT Rista Mutia Anggraini; Tika Restianingsih; Frastica Deswardani; Yoza Fendriani; Roedearni Ananda Putri Purba
JOURNAL ONLINE OF PHYSICS Vol. 9 No. 1 (2023): JOP (Journal Online of Physics) Vol 9 No 1
Publisher : Prodi Fisika FST UNJA

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.22437/jop.v9i1.28727

Abstract

Hydroxyapatite (HAp) biomaterials have been successfully obtained from Channa striata and Scomberomorus commerso fish bone. Heat treatment was chosen as the method to get it. Heat treatment was done at 400oC, 600oC, and 800oC. The X-ray diffractometer (XRD) was used to determine the crystalline phase and crystallography properties. Based on XRD data and JCPDS 09-0432, all samples showed the phase of HAp. However, the β-TCP phase has been found in samples from Scomberomorus commerso, which calcined at 600oC and 800oC. The crystallite size of HAp from Channa striata fish bone increased as followed by higher temperature, and Scomberomorus commerso has the same crystallite size on samples that calcined at 600oC and 800oC. The microstrain of both samples has the same trend: the higher the temperature, the lower the microstrain. The temperature also affected the crystallinity sample; the higher the calcined temperature, the improved crystallinity. Fourier Transform Infrared (FTIR) data determined the functional groups of samples. The functional groups that appeared were OH-, PO43-, and CO32-. The mass of samples before calcined differs from after calcined, where the mass after calcined is smaller than before. The higher the temperature we used, the more decreased yield percentage we got.
Co-Authors Afrianto, Muhammad Ficky Anak Agung Istri Sri Wiadnyani Ester Kristianti Frastica Deswardani Iful Amri Irfan Afifuddin Jesi Pebralia Linda Handayani Mardian Peslinof Nurhidayah Nurhidayah Nurhidayah Nurhidayah Rista Mutia Anggraini Rista Mutia Anggraini Rodearni Ananda Putri Purba Roedearni Ananda Putri Purba Rustan Yoza Fendriani