cover
Article Per Year (5 Year)
All
Home Page
OAI Link
Editorial Team
Contact
Reviewer
Google Scholar
Contact Name
Usman Malik
Contact Email
 usman.malik@lecturer.unri.ac.id
Phone
+62811756227
Journal Mail Official
kfi@ejournal.unri.ac.id
Editorial Address
Jurusan FMIPA Universitas Riau Kampus Bina Widya Km 12,5 Simpang Baru Pekanbaru
Location
Kota pekanbaru,
Riau
INDONESIA
Komunikasi Fisika Indonesia
Published by Universitas Riau
ISSN : 14122960     EISSN : 2579521X     DOI : 10.31258/jkfi
Core Subject : Science, Engineering,
Earth & Planetary Sciences Electrical & Electronics Engineering Energy Materials Science & Nanotechnology Physics
KFI mempublikasikan artikel hasil penelitian dan review pada bidang fisika, namun tidak terbatas, yang meliputi fisika murni, geofisika, plasma, optik dan fotonik, instrumentasi, dan elektronika, dan fisika terapan (aplikasi fisika).
Arjuna Subject : Fisika dan Astronomi - Fisika dan Astronomi (Lain-Lain)
Articles 390 Documents
 18   19   20   21   22 
INVESTIGASI KINERJA ANTENA BERDASARKAN DISPERSI ANOMALI METAMATERIAL STRUKTUR HEKSAGONAL SPLIT RING RESONATOR Yan Soerbakti; Romi Fadli Syahputra; Saktioto Saktioto; Moh. Danil Hendry Gamal
Komunikasi Fisika Indonesia Vol 17, No 2 (2020)
Publisher : Universitas Riau

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.31258/jkfi.17.2.74-79

Abstract

Metamaterial (MTM) anomaly dispersion characteristics have a great interest to be analyzed in the potential for increasing antenna performance. Dispersion material with a simple structure is able to cover the weaknesses of the antenna parameters. Characterization and optimization need to be applied to the MTM antenna design to obtain more effective antenna performance. Antenna operation is performed at 0-9 GHz microwave frequency with four SRR-H MTM structures varying in three radii of 2.5 mm, 2.7 mm, and 2.9 mm. The highest MTM characteristics occurred at four SRR-H radii of 2.9 mm with a refractive index of -8.5 which resulted in antenna parameters RL -48.8 dB, 5.98 dBi, and working frequency of 1.09-9.00 GHz. Antenna radiation occurs precisely in all MTM structures with an isotropic pattern or in all directions of 4.63 dBi at a frequency of 5.976 GHz.
ANALISA SUSEPTIBILITAS MAGNETIK DAN KANDUNGAN LOGAM BERAT PADA TANAH PERKEBUNAN KELAPA SAWIT Marisayani Hutauruk; Salomo Sinuraya
Komunikasi Fisika Indonesia Vol 17, No 2 (2020)
Publisher : Universitas Riau

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.31258/jkfi.17.2.108-113

Abstract

The study of soil carried out from oil palm plantation soils at Garuda sakti street, Tapung, Kampar, Riau has been implemented since November 2019 to March 2020. This study aims to determine magnetic susceptibility, mass susceptibility, magnetic degree and to identify soil compositions and the content of heavy metals in the soils and to analyse the influence of content of heavy metals to the magnetic susceptibility. The samples were taken about one hundred points, then the samples were dried, cleaned, mashed and sifted. Magnetic susceptibility was measured using the Probe Magnetic Pasco PS-2162. Magnetic particles were separated from samples using the NdFeB magnet and identification of soil composition and the content of heavy metals were carried out using the XRF. The result shows that the value of magnetic susceptibility, mass susceptibility, magnetic degree are fluctuated and the compositon of the soils are Mg, Al, Si, P, K, Fe, Ca, Ti, V, Cr, Mn, Ni, Zn  S, Cl, Co, Cu, Ga, Ge, As, Br, Rb, Sr, Y, Zr, Nb, Ag, Eu, Re and Pb and proved that soil has been contaminated by heavy metals such as V, Cr, Al, Fe, Ti and Sr from the soils until increase the Magnetic susceptibility of that soils.
INVESTIGASI PENGARUH PENAMBAHAN TUGAS TERHADAP HASIL BELAJAR SISWA: TEMUAN DI SMP NEGERI 1 LEWA KELAS VII Ochtavia Lutfi; Zulkarnain Zulkarnain
Komunikasi Fisika Indonesia Vol 17, No 2 (2020)
Publisher : Universitas Riau

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.31258/jkfi.17.2.55-61

Abstract

The learning process of goodness and organized teaching staff is highly prioritized to achieve the competencies expected to all students. Ineffective delivery due to time constraints, especially in science lessons causes the learning process run unwell. Besides the discomfort in learning is also an important problem in every teaching and learning process. Often students feel bored with the material delivered too monotonous and make students not pay attention to the teacher during studying. A new method of providing additional assignments at the end of each meeting is carried out in this study to obtain a change in students' interest in learning well. This study has two cycles with stages of planning, action, observation, reflection, and the end of the action. Direct observation is applied to this research method. The results showed that the first cycle had an increase in interest in learning from pre-cycle 33.33% to 50% with 20 students who had reached the minimum threshold (KKM) and 12 students who had not either. Increased interest in learning with very good criteria occurred in the second cycle with a percentage of 83.33% in which 31 students reached the KKM and 1 student was not.
ESTIMASI NILAI DOSIS RADIASI EFEKTIF PASIEN DARI CITRA MEDIS CT SCAN ASTEION MULTI 32 SLICE BAGIAN ABDOMEN Nadiah Wanara; Muhammad Hamdi; Salomo Sinuraya
Komunikasi Fisika Indonesia Vol 17, No 2 (2020)
Publisher : Universitas Riau

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.31258/jkfi.17.2.80-86

Abstract

Receipt of radiation doses in patients by CT scan media really contributed to the radio diagnostic field. So far, volume Computed Tomography Dose Index (CTDIvol) and Dose Length Product (DLP) are the dose parameters used as a prescription of the dose to the patients from the examination process on the CT scan. However, these parameters have the disadvantage that they only describe the dose output from the device without regard to patient size. Size Specific Dose Estimate (SSDE) is a dose correction based on patient size and an effective dose is the dose value that arises due to differences in biological sensitivity values. Calculation of SSDE values and total effective doses were carried out in this study from data of patients who had undergone an abdominal CT scan examination. Patient radiation dose data were obtained from documents collected from the Radiology Department at the Prima Pekanbaru hospital. The data was obtained from examination results of Toshiba Asterion Multi (CTB 400 tube) CT scan of the abdomen of 20 patients. The data analysis shows that the average value of SSDE for male and female patients are 19.64 mGy and 17.4 mGy and the average total effective dose for male and female patients are 12.63 mSv and 9.16 mSv. These data indicate that the level of radiation dose received by patients is below the threshold that has been evaluated based on BAPETEN provisions.
SIFAT OPTIK NANOPARTIKEL PERAK (Ag-NPs) MENGGUNAKAN BIOREDUKTOR EKSTRAK KULIT SEMANGKA KUNING Hazelina Adzani; Ari Sulistyo Rini
Komunikasi Fisika Indonesia Vol 17, No 2 (2020)
Publisher : Universitas Riau

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.31258/jkfi.17.2.104-107

Abstract

Synthesis of silver nanoparticles was carried out by a reduction method using yellow watermelon rind extract. Variation of sample on this synthesis was doing with ratio volume extract and ag, i.e., 1:3 and 3:1. This synthesis has been successfully carried out using 1M NaOH as a stabilizer. The formation and stability of silver nanoparticles was observed through Uv-vis absorbance spectrum. The results of the analysis using Uv-Vis spectroscopy show the formation of silver nanoparticles at wavelengths of 440-446 nm with absorbance values of 0.8356 a.u and 1.0458 a.u respectively. The FTIR analysis showed the existence of a polyphenol group functional with a range of wave numbers 601.82-3359.18 cm-1. This result concludes that yellow watermelon rind extract is involved in reducing Ag+ to Ag0.
ANALISA KEDALAMAN AIR PANAS MENGGUNAKAN METODE GEOLISTRIK KONFIGURASI SCHLUMBERGER DI OBJEK WISATA AIR PANAS PAWAN Cici Sang Putri; Usman Malik
Komunikasi Fisika Indonesia Vol 17, No 2 (2020)
Publisher : Universitas Riau

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.31258/jkfi.17.2.87-91

Abstract

Hot water depth analysis have been carried out using the Schlumberger Configuration geoelectric method. This research investigatis subsurface conditions by analyzing the resistivity value. The study was conducted at the Pawan Hot Spring tourisme object, Rokan Hulu, Riau using the Schlumberger rule which is brought closer to 2 track points with a length of 90 meters each. Measurment data were processed using Progress Software and the resistivity values obtained at Line I 100,83 – 63,54 Ohm.m with depths of 0,00 – 46 m and at Line II 146,73 – 239,71 Ohm.m with depths of 0,00 – 33 m. The interpretation result of the two tracks obtained that the hot water flow in Line I is in the sand layer with resistivity values 95,28 Ohm.m and 63,54 Ohm.m at depths of 3,77 – 46 m. Line II is found in the sandy clay layer with a resistivity value of 1,05 Ohm.m at depth of 3,56 – 3,66 m.
ANALISIS SENSOR KAPASITIF PELAT SEJAJAR PADA APLIKASINYA SEBAGAI DETEKSI ZAT SATU FASA DAN MULTI FASA Fahmi Muhammad Rabbani; Elvan Yuniarti; Mahfudz Al-Huda
Komunikasi Fisika Indonesia Vol 17, No 2 (2020)
Publisher : Universitas Riau

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.31258/jkfi.17.2.62-67

Abstract

This study uses a pipe/tube-shaped plate capacitive sensor to measure single-phase and multiphase substances to analyze linearity, frequency range, and sensitivity testing. The distance and area of the sensor electrode plate are held constant that and can be viewed from the dielectric material and experimental material. The material or dielectric medium in parallel plate capacitors is a phase consisting of air, aquades, and vegetable oils. Whereas multiphase substances are a combination of air volume, aquades, and vegetable oil. The best linearity analysis results are 0.9467 for aquades + 0.1% NaCl samples and the worst 0.564 for tap-water in layer 1 and the best linearity value is 0.966 for aquades + 0.1% NaCl samples and the most poor 0.5658 is on tap-water at layer 2. The optimal frequency range is at intervals of 500 kHz to 12.5 MHz and the smallest sensitivity test is 500 kHz and the greatest sensitivity is at 12.5 MHz.
ANALISA SIFAT MAGNETIK DAN IDENTIFIKASI KANDUNGAN PASIR SUNGAI KAMPAR PROVINSI RIAU William Handerson; Salomo Sinuraya
Komunikasi Fisika Indonesia Vol 17, No 2 (2020)
Publisher : Universitas Riau

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.31258/jkfi.17.2.92-96

Abstract

Research on the Analysis of Magnetic Properties and Content Identification of kampar River Sand Riau Province has been carried out. Sand samples taken in the Kampar River were then taken to  University of Riau instrumentation and magnetization laboratory to dry first, after which magnetic mineral separation was carried out using an Iron Sand Separator (ISS) . The next sample was measured its magnetic induction value using 2500 winding solenoids with currents (200, 400, 600, 800, 1000) mA with a fixed distance of 1 mm. The results showed that the magnetic susceptibility value for sand samples at point C was the highest value followed by the location of point B and point A with successive values of 13,767.96 x , 8,508.48 x  , and 8.008.10 x , and this value is included in the anti-ferromagnetic ilminite (FeTiO3) interval with a range of values (220-380000) x ,  . The results of the mass susceptibility value for the concentrate show that sand at the location of point C is the highest value followed by locations of points B and A with values of 13,969.70 x . 9,482.71 x .  and 6,441.25 x ., and this value is included in the inter ferromagnetic FeTiO3 ilminite interval with a range of values (46-8000 ) x .. X-Ray Fluorescence (XRF) test results for the Fe element have increased after ISS. Sand which is at point B has a greater percentage, followed by the locations of points A and C with values respectively 17.265%, 11.386% and 10.952%.
SINTESIS DAN KARAKTERISASI NANOPARTIKEL Fe2O3 DARI PASIR ALAM DESA LOGAS KABUPATEN KUANTAN SINGINGI Meilan Sihombing; Erwin Amiruddin
Komunikasi Fisika Indonesia Vol 17, No 2 (2020)
Publisher : Universitas Riau

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.31258/jkfi.17.2.68-73

Abstract

Determination of magnetic and structural properties of natural sand from Logas Village, Kuantan Singingi have been carried out using a magnetic Probe Pasco PS-2162 and X-Ray Diffraction methode. Samples were synthesized using multi step ball milling methode for 90 and 90+30 hours. Results show that the magneticsuceptibility increased with increasing of ball milling time, from 90 hours to 90+30 hours. This magnetic suceptibility within the interval (46-80000) x 10-8 m3/kg which is the interval of Ilminite mineral (FeTiO3; Antiferromagnetic). X-Ray Fluorescence result showed that the composition of Fe and Ti increased after milled for 90+30 hours, while other element like Si decreased. The XRD result confirmed that the phase of the sample structure is Hematite (α-Fe2O3). However, some other phases including SiO2 and FeTiO3 are observed in diffraction pattern. This indicates that the sample is not purely hematite.
TAMPILAN BIREFRINGENCE PADA GANGGUAN PEMBENGKOKAN SERAT OPTIK KOMERSIAL Velia Veriyanti; Saktioto Saktioto
Komunikasi Fisika Indonesia Vol 17, No 2 (2020)
Publisher : Universitas Riau

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.31258/jkfi.17.2.97-103

Abstract

Optical fiber components are increasingly growing in the telecommunication technology with various forms to facilitate effective and stable communication. However, the output signal of optical fiber is still experiencing interference, bending power loss n and dispersion, such as birefringence. To minimize the interference, this paper investigates birefringence profile on the aspect of disturbance and geometrical parameters for commercial single-mode optical fiber (SMF) through OptiFiber simulation. This simulation build the model of several SMFs, namely SMF-28, SMF-28e, SMF-28e +, SMF-28e + LL, and SMF-28 ULL which have different refractive index for core and cladding, but their radii are fixed for each wavelength source of 1310nm and 1550nm. The impact of interference on optical fiber can be understood from birefringence model of its bending radius to  power loss and wavelength. The highest loss occurred at SMF-28 fiber of 0.012dB / km with a radius of 0.020m for wavelength of 1310nm and bending loss at wavelength of 1550nm was 31.96dB / km at radius of 0.02m. This finding shows that magnitude of normalized frequency strongly determines the effectiveness and stability of optical fibers.

Page 20 of 39 | Total Record : 390

 18   19   20   21   22 

Filter by Year

2011 2025


Reset
Filter By Issues
All Issue Vol 22, No 2 (2025) Vol 22, No 1 (2025) Vol 21, No 3 (2024) Vol 21, No 2 (2024) Vol 21, No 1 (2024) Vol 20, No 3 (2023) Vol 20, No 2 (2023) Vol 20, No 1 (2023) Vol 19, No 3 (2022) Vol 19, No 2 (2022) Vol 19, No 1 (2022) Vol 18, No 3 (2021) Vol 18, No 2 (2021) Vol 18, No 1 (2021) Vol 17, No 3 (2020) Vol 17, No 2 (2020) Vol 17, No 1 (2020) Vol 16, No 2 (2019) Vol 16, No 1 (2019) Vol 15, No 2 (2018) Vol 15, No 1 (2018) Vol 14, No 2 (2017) Vol 14, No 1 (2017) Vol 13, No 13 (2016) Vol 13, No 12 (2016) Vol 13, No 12 (2016) Vol 12, No 11 (2015) Vol 12, No 10 (2015) Vol 11, No 9 (2014) Vol 11, No 8 (2014) Vol 10, No 7 (2013) Vol 10, No 6 (2013) Vol 9, No 04 (2012) Vol 9, No 5 (2012) Vol 8, No 3 (2011) More Issue