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Komunikasi Fisika Indonesia

JKFI
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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

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PENGARUH HAMBATAN INTERNAL TERHADAP DAYA OUTPUT ELEMEN TERMOELEKTRIK GENERATOR TIPE 10W-4V-40s Eri Wiyadi; Lazuardi Umar
Komunikasi Fisika Indonesia Vol 15, No 1 (2018)
Publisher : Universitas Riau

Thermoelectric generator Type 10W-4V-40s powered by Seebeck effect by utilizing temperature difference in both sides of the element. The hot side (Th) of a TEG element is placed on a stand made of Aluminum-Dural material and given a heat source derived from a heater, on the cold side (Tc) TEG element installed heatsink to reduce heat energy through the cold side and keep the temperature low. The measurement of output power (PL) is done by variation of RL from 0 Ω to 20 Ω under temperature difference conditions (ΔT) varies with constant Tc at 30ºC, the result of the research indicates that the output power (PL) of the thermoelectric element is maximum at RL = 1 Ω when the minimum load decreases and is proportional to the increase in RL resistance. The internal resistance value (Rint) of the TEG element increases in proportion to the magnitude of ΔT on both sides of the element, on Tc and Th at room temperature (30ºC) the value of Rint is 0.85 Ω and the maximum value at ΔT = 50ºC is 1,043 Ω. This indicates that the TEG element depends not only on ΔT on both sides of the module, but also depends on the amount of temperature range used.

STUDI SIFAT MAGNETIK DAN UKURAN PARTIKEL ABU VULKANIK ERUPSI GUNUNG SINABUNG KABUPATEN KARO MENGGUNAKAN PROBE PASCO 2162 Salomo Salomo; Serima Apriani Purba; Riad Syech
Komunikasi Fisika Indonesia Vol 15, No 1 (2018)
Publisher : Universitas Riau

This study aims to determine the magnetic properties and particle size of the volcanic ash of Sinabung Mount with experiment method. Magnetic properties studied were magnetic degree, magnetic induction magnetic susceptibility, and mass susceptibility of sample. The samples used were volcanic ash taken from the west part of Sinabung, precisely at Gurukinayan village. The ash samples were taken horizontally on the slopes of the Mountain with the amount of 1.5 Kg each point with the number of 10 points (A to J). Separation of concentrate of ash was done using a Neodymium Iron Boron (NdFeB). The magnetic induction of ash and concentrate was measured using a Pasco 2162 Probe using a solenoid is 3 cm in diameter, 10 cm in length and 2000 coil turns. Magnetic induction without a core was measured as a current function (2,4,6,8,10)A and a distance of 1 to 5 mm. The total magnetic induction of ash and concentrate was measured as a current function and the particle sizes was measured using a Light Microscope. The results showed that the greate magnetic degree value at point B of 7.02% and the lowerst level of magnetism is at point J was 1.07%. The largest particle sizes is at point B and the smallest is at point J with particle size of 0.175-0.90 mm. The highest average magnetic susceptibility value for concentrate at point B is 87.32 x 10-3 and the lowest at point F is 20 x 10-3. Based on the mass susceptibility value of the concentrate obtained the volcanic ash of Mount Sinabung is at interval (46–80.000) x 10-8 m3/kg of mass susceptibility value at each location point which contains Ilmenite particles (FeTiO3).

VISUALISASI STRUKTUR KRISTAL KERAMIK PEROVSKITE MENGGUNAKAN VESTA Sundami Restiana; Ari Sulistyo Rini
Komunikasi Fisika Indonesia Vol 15, No 1 (2018)
Publisher : Universitas Riau

Visualization of crystal structures and simulation of X-ray diffraction patterns of perovskite ceramic was successfully performed by VESTA software programs. The purpose of this research is to obtain the relation of lattice parameter, and composition to the diffraction pattern. The software program produces crystal structure information and a representative X-ray diffraction pattern for the ceramic materials. The program needs several input parameters such as the coordinates of each constituent atom, lattice parameters, and space symmetry. The obtained output of the software program are in the form of diffraction pattern graph and crystal structure data which gives the description of the profile and type (phase) of ceramic material. The results showed that the peak position and intensity of the diffraction pattern are influenced by the arrangement of the atoms within the unit cell. The addition of impurity atoms such as Sr on the Ba side in BaTiO3 causes the BaTiO3 structure changes from Orthorombic (a≠b≠c) to Tetragonal (a=b≠c) structure. Based on the simulation, it can be predicted that the critical concentration of the change of structure occur at Sr concentration about 0.4.

PENGARUH AKTIVASI KIMIA DENGAN BANTUAN IRADIASI GELOMBANG MIKRO TERHADAP SIFAT FISIS KARBON AKTIF DARI SEKAM PADI SEBAGAI ADSORBEN Nurlisa Kartikasari; Rakhmawati Farma; Awitdrus Awitdrus
Komunikasi Fisika Indonesia Vol 15, No 1 (2018)
Publisher : Universitas Riau

The percentage of KOH affects the quality of activated carbon. In this research the activated carbon has been made of biomass from rice husk by using the process carbonization, chemical activation using Potassium Hydroxide variated percentage for 5%, 10%, 15% and 20% from the mass of sample and microwave irradiation power by 450 Watt. The surface morphology of activated carbon for the sample KA10 produced the even pores structure and lots of pores more than sample KA5, KA15 and KA20. The analysis results of surface morphology of activated also supported by analysis atomic adsorption spectroscopy (AAS) show that sample KA10 has the highest heavy metal adsorption 92,40% for Ni, 91,31% for Pb and 70,24% for Zn.

VISUALISASI POTENSIAL LISTRIK DI ANTARA DUA PLAT SEJAJAR BERHINGGA DENGAN PROGRAM KOMPUTER BERBASIS MATLAB Eviliony Eviliony; Erwin Erwin; Antonius Surbakti
Komunikasi Fisika Indonesia Vol 15, No 1 (2018)
Publisher : Universitas Riau

The calculation of electric potential between two parallel plates with finite size is difficult work, visualization of the issue comprehensively is needed. In this paper, visualization of electric potential between two parallel plates with finite size has been done by developing a MATLAB based computer program. The electric potential was calculated by solving two dimensional Laplace equation. There are two parts of the program that have been developed, the menu program and the main program. The menu program was provided to store the input data required in the calculation. While, the main program served toperform calculations and visualization of the electric potential. The visualization of the electric potential was shown in the mesh and contour graph. The results showed that the program is applicable for various sizes of plates, and the electric potential in each position can be calculated and visualized. However, the computer programs has some limitations, such as for perfoming calculations of electric potential. For plate width ( ) of m, distance of plates ( ) of m, and initial potential ( )of Volt, the electric potential in coordinate (20,0.5) is not defined (NaN).

ANALISA TINGKAT RESAPAN TANAH BERDASARKAN PENGUKURAN PERMEABILITAS TANAH (Studi Kasus Kecamatan Tampan Kota Pekanbaru) Usman Malik; Indra Gunawan; Juandi M
Komunikasi Fisika Indonesia Vol 15, No 1 (2018)
Publisher : Universitas Riau

Research was conducted to analyze the soil absorption level based on measurements of soil permeability in District Tampan Pekanbaru City, by taking soil samples for 16 units in four villages namely Simpang Baru, Delima, Tuah Karya, and Sidomulyo Barat which consists of four research blocks. Data inputted into the surfer’s software 11 to be processed so as to produce a contour map of soil absorption level. The results that highest soil absorption of the land in Tuah Karya Village of 108,090.50 m3/year whereas lowest soil absorption of the land in Simpang Baru Village of 91,149.35 m3/year. High soil absorption level caused by open spaces area was large and the amount of rainfall that absorbed into the soil and soil absorption coefficient was high. While the low soil absorption level caused by open spaces area was small and the least rainfall that absorbed into the soil and the soil absorption coefficient is low.

ANALISA PENGARUH FILTER WARNA DAN DAYA LAMPU FLUORESCENT TERHADAP KELAJUAN NYAMUK Gita Rahayu; Saktioto Saktioto
Komunikasi Fisika Indonesia Vol 15, No 2 (2018)
Publisher : Universitas Riau

Mosquitoes are insects that can cause dangerous problems to human health. Therefore, mosquitoes need to be identified based on its motion so it can stay away from human. The purpose of this research is to investigate the effect of power and color spectrum of lamp toward mosquito speed. This research used optical method based on light beam that affected mosquitobody. This research designed a radiation system inside a glass box with thickness of 0,5 cm size (30x7x20) cm. Five mosquitoes were irradiated by light from fluorescent lamp with power 11 Watt and 26 Watt that have been filtered using red, orange, yellow, green, blue and purple color plastics. The radiation process was recorded using a digital camera about 26 minutes. The recorded video was processed using Tracker program. The Tracker program analyzedthe mosquito speed based on its displacement from one to another position. The results showed that mosquito highest speed at unfiltered light, red, blue and purple colors occurred when irradiated with 26 Watt lamp while at color of orange, yellow and green occured when irradiated with 11 Watt lamp. Mosquitoes highest speed value when irradiated by orange, yellow and green are 0,632 m/s, 0,693 m/s and 0,645 m/s. Mosquitoes lowest speed value when irradiated by blue and purple light are 0,308 m/s and 0,285 m/s. The speed of the mosquitoes when irradiated by red and unfiltered lights are 0,517 m/s and 0,541 m/s respectively. The data showed that mosquitoes moved away from light source when irradiated by unfiltered lights, red, blue and purple while mosquitoes approached the light source when irradiated by orange, yellow and green light.

FASIES KUARTER VULKANIK DAERAH PAGAR JATI DAN SEKITARNYA, KAB.BENGKULU TENGAH, BENGKULU Aditya N.P.H; Oke Aflatun; Idarwati Idarwati
Komunikasi Fisika Indonesia Vol 15, No 2 (2018)
Publisher : Universitas Riau

The Jati Fence Area, Bengkulu is the fore arc basin area whose deposition is influenced by the volcanic event. The deposition event took place on a quaternary volcano that has been active in having sedimentation activities that continue. This study aims to carry out mineralogical analysis in the proximal facies deposit area with petrographic data at observation locations (LP) 14, 59, 81,108, and (ST) 14,70 which are sourced from the results of local geological mapping. In LP 81 and 14 with proximal facies have volcanic breccia lithology with compilation components which are dominated by andesitic rocks, pyroclastic matrix composition, packed packing, hard hardness, and mineralogicalcomposition which tend to have many crystals. In LP 59 and 108 proximal facies found andesite lava.

PENENTUAN STRUKTUR TANAH SEBAGAI DASAR UJI KELAYAKAN KEKUATAN BANGUNAN PERUMAHAN DI MUARO JAMBI MENGGUNAKAN METODE GEOLISTRIK KONFIGURASI DIPOLE-DIPOLE Muhammad Ikhsan; Faizar Farid; Samsidar Samsidar; Linda Handayani
Komunikasi Fisika Indonesia Vol 15, No 2 (2018)
Publisher : Universitas Riau

This research describes the foundation standard in Muaro Jambi. The objective is to determine the subsurface structure as well as to determine the suitable foundation standards for residential buildings in Muaro Jambi. In this study, data collection is divided into 2 residential places, the first in the housing Arza Griya Mandiri and Griya Sungai Duren Indah housing. Each housing will be taking 3 geolistrik data with path length 160 m and datum point as much as 69 datum. The result of field data obtained in the form of voltage value and current value, this value is inputted into Microsoft Excel software and searched for obstacle value and ρa. Datum point value, space electrode, layer, and value ρa are combined and input into notepad software to be processed using Res2DINV software. The results show that the foundation has been built almost in accordance with soil structure and foundation of soil obtained from the research. A suitable soil layer to build a foundation is a rocky clay layer where in this study the depth of this layer varies from 1.71 m to 18.4 m.

ANALISIS NILAI PERCENTAGE DEPTH DOSE(PDD) TERHADAP VARIASI KEDALAMAN TARGET DAN LUAS LAPANGAN PENYINARAN MENGGUNAKAN PESAWAT LINAC-CX Dian Milvita; Alimin Mahyudin; Vinny Alvionita
Komunikasi Fisika Indonesia Vol 15, No 2 (2018)
Publisher : Universitas Riau

Percentage Depth Dose (PDD) value measurement is done by varying the target depth and field size. The study was carried out with variations in target depth of 0 cm to 30 cm with 1 cm intervals and fields size ranging from (5x5) cm2 to (39x39) cm2 with intervals (2x2) cm2. PDD is a comparison of the radiation dose at a depth to the radiation dose at the maximum depth normalized by percentage. This study was also conducted to determine the value of radiation doses received by phantoms from the PDD measurement value. This research used 2 photon energy beam that is 6 MV and 10 MV. This study uses water phantom as a substitute for patients with radiation source technique Source Surface Distance (SSD). PDD measurements were performed using a chamber ionization detector. The results obtained showed that the number of radiation doses received by fantom increased to the maximum depth (zmax). After passing zmaks, the radiation dose received by the phantom has decreased. Likewise along with the increase in the amount of radiation field, the value of radiation doses received by phantoms will also increase.

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Usman Malik

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Home Page

OAI Link

Editorial Team

Contact

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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

Abstract

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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