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JFA (Jurnal Fisika dan Aplikasinya)
Published by Institut Teknologi Sepuluh Nopember Surabaya
ISSN : 1858036X     EISSN : 24604682     DOI : -
Core Subject : Science,
Physics
JFA (Jurnal Fisika dan Aplikasinya, Abbreviation: J.Fis. dan Apl.) hanya menerbitkan artikel penelitian asli serta mengulas artikel tentang topik seputar bidang fisika (fisika teori, material, optik, instrumentasi, geofisika) dan aplikasinya. Naskah yang dikirimkan ke JFA belum pernah diterbitkan ditempat lain serta tidak dalam proses pertimbangan untuk diterbitkan ditempat lain, dalam bahasa apapun. Studi teoritis, eksperimental, dan praktis sama-sama didorong, seperti juga artikel interdisipliner dan yang timbul dari penelitian dan kolaborasi industri.
Arjuna Subject : -
Articles 604 Documents
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The Use of Dirac Oscillator as Medium Substrate for Quantum Heat Engine: Heru Sukamto, Bintoro Anang Subagyo, Agus Purwanto Heru Sukamto Heru Sukamto; Bintoro Anang Subagyo Bintoro Anang Subagyo; Agus Purwanto Agus Purwanto
Jurnal Fisika dan Aplikasinya Vol 18 No 3 (2022): October 2022 Edition
Publisher : Lembaga Penelitian dan Pengabdian Kepada Masyarakat, LPPM-ITS

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.12962/j24604682.v18i3.5282

Abstract

The research on Dirac oscillators has been increasing recently. In this paper, a quantum heat engine by means of a Dirac oscillator that interacts with the external magnetic field is proposed. Relativistic Landau energy levels are used to perform the iso-energetic cycle. The large magnetic field is set to obtain a perfect thermodynamic cycle. Some stable performances at a certain magnitude of magnetic field and expansion parameter range are obtained. When the value of efficiency is compared with the non-relativistic case, an opposite result occurs. Therefore, a quantum heat engine using a Dirac oscillator doesn’t govern like a classical oscillator.
Synthesis of Au50Ag50 Alloy Nanoparticles From Metal Ions and Colloidal Nanoparticles Through Photochemical Reduction Methods Using Femtosecond Laser: Affi Nur Hidayah, Yuliati Herbani Affi Nur Hidayah Affi Nur Hidayah; Yuliati Herbani Yuliati Herbani
Jurnal Fisika dan Aplikasinya Vol 18 No 2 (2022): Juni 2022 Edition
Publisher : Lembaga Penelitian dan Pengabdian Kepada Masyarakat, LPPM-ITS

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.12962/j24604682.v18i2.11004

Abstract

Nanoparticles synthesized through photochemical reduction using femtosecond involve reducing agent that reduces metal ions into nanoparticles. We synthesized Au50Ag50 from metal ions and colloidal nanoparticles in four different conditions: (i) gold metal ions and silver metal ion, (ii) colloidal gold nanoparticles (AuNPs) and silver nanoparticles (AgNPs), (iii) gold metal ions and colloidal silver nanoparticles (AgNPs), and (iv) colloidal gold nanoparticles (AuNPs) and silver metal ions. Gold and metal ions were obtained from dilution of gold and silver metal salts. While gold and silver nanoparticles were obtained from gold and metal ions added into a quartz cuvette and irradiated by femtosecond laser in 10 minutes irradiation time. In the synthesis, every condition respectively mixed in 3 ml solution into a 10x10x45 mm quartz cuvette and irradiated by femtosecond laser in 5-, 10- and 15- minutes irradiation time. The result showed that Au50Ag50 alloy nanoparticles were successfully synthesized in four different conditions, and the LSPR (Localized Surface Plasmon Resonance) in 15 minutes irradiation time was observed at 454.51, 458.74, 459.60, and 457.29 nm in the condition (i), (ii), (iii), and (iv), respectively.
Magnetic Susceptibility of Volcanic Soil on the Surface of Mount Singgalang, Sumatra Barat: Azmi Renaldi Renaldi Alrahmadana, Hamdi Rifai, Syafriani Syafriani, Fatni Mufit, Nofi Yendri Sudiar Azmi Renaldi Renaldi Alrahmadana Azmi Renaldi Renaldi Alrahmadana; Hamdi Rifai Hamdi Rifai; Syafriani Syafriani; Fatni Mufit Fatni Mufit; Nofi Yendri Sudiar Nofi Yendri Sudiar
Jurnal Fisika dan Aplikasinya Vol 18 No 2 (2022): Juni 2022 Edition
Publisher : Lembaga Penelitian dan Pengabdian Kepada Masyarakat, LPPM-ITS

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.12962/j24604682.v18i2.12361

Abstract

Volcanic soil is a part of interest for physical, chemical, and morphology studies of soil derived from volcanic ash, which is known to be fertile and is one of the most productive soils in the world. They are also known to have a high environmental carrying capacity, as evidenced by the dense population in the area around the volcano. The soil contains many minerals, one of which is magnetic minerals. However, there is no document so far that records the value of the magnetic susceptibility of volcanic soil on the surface of Mount Singgalang. This study aims to determine the abundance of magnetic minerals based on their magnetic susceptibility values. To achieve this goal, the rock magnetism method is applied with the Bartington magnetic susceptibility meter type MS2B sensor instrument. Magnetic susceptibility values can be used as initial characteristics to understand past volcanic processes and explain environmental changes. This method is very effective, inexpensive, sensitive, fast, and non-destructive. The results showed that the value of the magnetic susceptibility of volcanic soils varied with a value range of 93.3 - 352.5 (x10-8 m3/kg). Based on this value, it is assumed that the magnetic mineral properties are antiferromagnetic. The average frequency dependent susceptibility (Xfd) (%) ranges from 0.831 - 2.090 %, indicating that the measured volcanic soil contains almost no superparamagnetic grains and is generally dominated by multi-domain grains.
Fabrication of Polyaniline Thin Film Using Electrodeposition Method as Alcohol Sensor: Ana Yuli Komariyah, Nugrahani Primary Putri Ana Yuli Komariyah Ana Yuli Komariyah; Nugrahani Primary Putri Nugrahani Primary Putri
Jurnal Fisika dan Aplikasinya Vol 18 No 2 (2022): Juni 2022 Edition
Publisher : Lembaga Penelitian dan Pengabdian Kepada Masyarakat, LPPM-ITS

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.12962/j24604682.v18i2.12812

Abstract

The use of aliphatic alcohols such as methanol as an alternative renewable fuel in high-density engines can harm both the environment and human health. Polyaniline (PANi), a conductive polymer, has emerged as a solution to this problem because of its benefits as a sensor with relatively high conductivity. In this study, PANi was synthesized using a potentiostat electrodeposition method at a constant potential of -0.4 to +1.0 V at a scan rate of 100 mV/s, resulting in a thin film of PANi on the ITO surface. The formed PANi samples were used to determine the sensitivity level of the sensor to methanol at different concentrations. Morphological results of PANi deposited on the ITO surface were observed using SEM showing the shape of nanoparticles with an interconnected-sponge structure and a porous shape with a diameter of 35.3 nm. The PANI sample can be applied as a sensor material for detecting alcohol vapour in indoor air (at room temperature). The sensing measurement results show that the PANi-based sensor can detect methanol vapour at low concentrations up to 5 ppm. The higher the methanol concentration used, the higher the sensor sensitivity.
Design and Implementation of Non-Contact Infrared Thermometer based MLX90614 and Ultrasonic Sensors: Inayatul Inayah, Heri Kiswanto, Achmad Dimyati, Muhammad Ghofinda Prasetia Inayatul Inayah Inayatul Inayah; Heri Kiswanto Heri Kiswanto; Achmad Dimyati Achmad Dimyati; Muhammad Ghofinda Prasetia Muhammad Ghofinda Prasetia
Jurnal Fisika dan Aplikasinya Vol 18 No 2 (2022): Juni 2022 Edition
Publisher : Lembaga Penelitian dan Pengabdian Kepada Masyarakat, LPPM-ITS

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.12962/j24604682.v18i2.10746

Abstract

Masurement of body temperature is essential to know the condition of the individual’s body. Temperature measurements need to be carried out without contact between individuals and devices or individuals with other individuals to prevent the transmission of Covid-19. In this study, a non-contact thermometer has been designed using an MLX90614 sensor to measure body temperature, and an HC-SR04 ultrasonic sensor to detect objects at 5-30 cm. The sensor reading results will be displayed via the TFT LCD in real-time. If the detected object temperature exceeds 37.5 oC, the buzzer will sound, and the LED will light up. The constructed thermometer is supplied by 12 V DC adapter to provide 5 V output to the microcontroller. Proximity sensor, temperature sensor, and TFT LCD work on 5 V DC voltage. A Resistor and a transistor were needed to turn on the LED and 12 V high decibel buzzer. This instrument has been tested and compared with a commercial thermometer AD801 model for measuring palms and forehead. Based on our study, the difference in palm and forehead temperature readings between the two thermometers in two individuals ranges from 0 to 0.2 oC. This reading error was still within the tolerance of the reading error listed on the MLX90614 sensor datasheet, which is ± 0.3 oC.
Green Reduction of Graphene Oxide (GO) from Coconut Shell Using Rose Water in Various Temperature: Biaunik Niski Kumila, Nihlah Zaidah, Hamdan Hadi Kusuma Biaunik Niski Kumila Biaunik Niski Kumila; Nihlah Zaidah Nihlah Zaidah; Hamdan Hadi Kusuma Hamdan Hadi Kusuma
Jurnal Fisika dan Aplikasinya Vol 18 No 2 (2022): Juni 2022 Edition
Publisher : Lembaga Penelitian dan Pengabdian Kepada Masyarakat, LPPM-ITS

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.12962/j24604682.v18i2.12277

Abstract

Graphene and its related materials have attracted much interest in various applications regarding its exceptional physical, chemical, and mechanical properties. Reduction of graphene oxide (GO) from natural resources is recognized as one of the promising methods for low-cost and large-scale production of graphene-based materials. However, the reduction of GO is generally involves the application of toxic and poisonous substances. To counter this challenge, the green reduction which employ non-hazardous substances was introduced by numerous researchers. In this research, the green reduction of graphene oxide from coconut shell was investigated using rose water at room temperature, 70, 80, 90, and 1000 C. The prepared GO and green reduced GO (rGO) were characterized by X-Ray diffraction (XRD), Scanning Electron Microscope - Energy Dispersive X-Ray (SEM-EDX), Fourier transform infrared (FTIR), and I-V measurement. The low-cost and easy-handle green reduction of GO was obtained by immersing in rose water at room temperature which exhibit carbon to oxygen ratio, C/O of 2.97. Moreover, the effect of oxygenated-functional group to the electrical properties was also strongly discussed.
The Role of On-site Coulumb Interaction on Electronic Structure of FeO: Irwan Ramli, Nirmala Arfa, Rahma Hi Manrulu, Fitri Jusmi Irwan Ramli Irwan Ramli; Nirmala Arfa Nirmala Arfa; Rahma Hi Manrulu Rahma Hi Manrulu; Fitri Jusmi Fitri Jusmi
Jurnal Fisika dan Aplikasinya Vol 18 No 1 (2022): January 2022 Edition
Publisher : Lembaga Penelitian dan Pengabdian Kepada Masyarakat, LPPM-ITS

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.12962/j24604682.v18i1.8055

Abstract

We report our density functional theory (DFT) calculation on FeO in order to describe its electronic properties. FeO exhibits an antiferromagnetic at the ground state with cubic structure and Neel temperature TN = 198 K. The DFT calculation is as powerful tool to describe electronic properties but known to be failed to describe the electronic properties of system with strong on-site Coulomb interaction such as FeO. Here, we introduce the Hubbard correction, U, in order to take into account the on-site Coulomb interaction of d-electron at Fe ion. Hybridization of 3d-electron of Fe and 2p-electron of O splits the energy level to become upper Hubbard band (UHB) and low Hubbard band (LHB). Based on the DFT+U calculation, the band structure of FeO shows an insulator feature with the band gap of 1.65 eV, and its density of state (DOS) implies that this gap arises from splitting 3d-electron of Fe.
Simple Investigation on the Optical Properties of Carbon Nanodots Using Lasers and a Lux Meter: Febriani Febriani, Athi' Nur Auliati Rahmah, Bian Itsna Ashfa Al Ashfiya, Juli Astono, Wipsar Sunu Brams Dwandaru Febriani Febriani Febriani Febriani; Athi’ Nur Auliati Rahmah Athi’ Nur Auliati Rahmah; Bian Itsna Ashfa Al Ashfiya Bian Itsna Ashfa Al Ashfiya; Juli Astono Juli Astono; Wipsar Sunu Brams Dwandaru Wipsar Sunu Brams Dwandaru
Jurnal Fisika dan Aplikasinya Vol 18 No 1 (2022): January 2022 Edition
Publisher : Lembaga Penelitian dan Pengabdian Kepada Masyarakat, LPPM-ITS

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.12962/j24604682.v18i1.11005

Abstract

Carbon nanodots (Cdots) have excellent optical properties. This study aims to investigate scattering and absorption of Cdots via simple exposure of ultraviolet (UV)/violet, red, and green lasers. The experiment was conducted by preparing the Cdots from cajuput oil distillation wastes as the precursor. The solid wastes were dried under the sun, grounded into powder, filtered, and carbonized inside an oven at 250 oC for one hour. The carbonized powder was then mixed with distilled water, left for a night, and then filtered again so that the Cdots solution was obtained. Here, the mass of the precursor was varied. The Cdots samples were characterized using ultraviolet-visible (UV-Vis) and photoluminescence (PL) spectroscopies, and also particle size analyzer (PSA). The lasers were directly exposed to the Cdots samples. A digital lux-meter was used to measure the intensity of the lasers transmitted from the sample. The angle of the lux-meter was varied on a circular track. The sample was on the center of the track. The UV-Vis characterization showed two peaks at 217 nm and 270 nm, and a tail extending to the visible region. The PL characterization showed an intensity peak at 509.57 nm, which confirms the cyan luminescence of the Cdots. The PSA characterization indicated that the size of the Cdots was 1.04 nm. Moreover, at an angle of 0o, the UV wavelength was strongly absorbed by the Cdots in accordance with the UV-Vis characterization result. The intensity of the green laser also dominates as it was less absorbed and strongly scattered by the Cdots.
The Influence of Humidity-Control Addition on Electrospinning System for Nanofiber Formatio: Diky Anggoro, M Rizki Romadhoni, Imam Muhlas, Iim Fatimah Diky Anggoro Diky Anggoro; M Rizki Romadhoni M Rizki Romadhoni; Imam Muhlas Imam Muhlas; Iim Fatimah Iim Fatimah
Jurnal Fisika dan Aplikasinya Vol 18 No 1 (2022): January 2022 Edition
Publisher : Lembaga Penelitian dan Pengabdian Kepada Masyarakat, LPPM-ITS

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.12962/j24604682.v18i1.11659

Abstract

This research was conducted to determine the effect of humidity control system and collector rotational speed on electrospinning during PVA nanofiber fabrication. The humidity control system is controlled by Arduino Uno and the actuator is an air pump, and modifications are made to the air pump by adding silica gel as a more optimal humidity reducing agent. A 12 V DC-motor and L293D driver are used to control the direction and speed of rotation of the collector. The collector speed control uses the principle of Pulse Width Modulation (PWM). The humidity control system that has been made has an accuracy rate of more than 88%, and the lowest relative humidity achieved is 30%. The collector control system that has been made has an accuracy rate of more than 95%, and the lowest rotational speed is 125 RPM. Carbon nanofiber was successfully fabricated with an average diameter distribution of 43.4 nm and 79.2 nm at 30% and 40% humidity, respectively.
Effect of Lanthanum Substitution on the Structure and Conductivity of LNMC Samples as Battery Cathodes: Maya Puspitasari Izaak, Y. E. Gunanto, H. Sitompul, Y. Purwamargapratala Maya Puspitasari Izaak Maya Puspitasari Izaak; Y. E. Gunanto Y. E. Gunanto; H. Sitompul H. Sitompul; Y. Purwamargapratala Y. Purwamargapratala
Jurnal Fisika dan Aplikasinya Vol 18 No 1 (2022): January 2022 Edition
Publisher : Lembaga Penelitian dan Pengabdian Kepada Masyarakat, LPPM-ITS

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.12962/j24604682.v18i1.10902

Abstract

Lithium-Nickel-Manganese-Cobalt (LNMC) is one of the most successful types of lithium-ion batteries in the market. This battery is a combination of three main metals, nickel, manganese, and cobalt, with relatively the same composition. Measurements was performed on three LMNC materials combined with La composites to reduce the toxicity level of the Cobalt. The purpose of this research is to synthesize and characterize LMNC materials with certain La combinations, thus it is expected to be able to be used as battery cathode. Characterization of materials was carried out using XRD, SEM, and LCR-meter. In this study, we succeed in synthesizing and characterizing LMNC materials with a size of about 150-750 nm. The LCR-meter characterization found conductivity values of approximately 1.06×10-3, 7.07×1010-4, and 4.05×1010-3 S/cm at 100 Hz, 2.29×1010-3, 2.56×1010-3, and 1.34×1010-2 S/cm at 2.5 MHz, 2.74×1010-3, 3.04×1010-3, and 1.51×1010-2 S/cm at 5 MHz for La dopping with x = 0.01, 0.03, and 0.05, respectively. The La substitution increases the conductivity value and reduces the particle size to nanoscale.

Page 49 of 61 | Total Record : 604

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