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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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KARAKTERISASI DAN SIMULASI DIODA PN MEMPERGUNAKAN ALAT UJI OTOMATIS BERBASIS MIKROKONTROLER ATMEGA8A Dian Putri Oktavia; Yanuar Hamzah; Rahmondia N.S '; Lazuardi Umar
Komunikasi Fisika Indonesia Vol 13, No 12 (2016)
Publisher : Universitas Riau

Program uji otomatis untuk mengkarakterisasi kurva I-U pada dioda berbasis modul Arduino dengan mikrokontroler Atmega8A telah dilakukan. Empat jenis dioda yang digunakan adalah 1N4007, 1N5401, 1N5392, dan 1N4148 yang dikarakterisasi pada suhu 303K dengan masing-masing tegangan uji (dU) 1mV, 5mV, 10mV, 20mV, 50mV, 100mV, dan 500mV. Pengamatan pengaruh suhu pada dioda menggunakan ruang adiabatis untuk pengukuran tiga suhu yang berbeda yaitu 313K, 323K dan 333K yang kemudian menghasilkan kurva I-U. Hasil pengukuran memperlihatkan kenaikan pada kurva I-U dioda secara eksponensial pada kuadran I (wilayah panjar maju). Untuk parameter dioda, kurva I-U dimodelkan dan disimulasikan yang merujuk pada persamaan dioda dan persen error maksimum sebesar 10,57% berbanding dengan pengukuran dalam full scale.

PENGARUH DAYA IRADIASI GELOMBANG MIKRO TERHADAP KUALITAS KARBON AKTIF CANGKANG BUAH KETAPANG SEBAGAI ADSORBEN ZAT WARNA Awitdrus '; Rakhmawati Farma; Karina Silviani
Komunikasi Fisika Indonesia Vol 13, No 13 (2016)
Publisher : Universitas Riau

Telah berhasil dibuat karbon aktif dari cangkang Terminalia Catappa L melalui proes karbonisasi dan aktivasi kimia menggunakan KOH dengan bantuan daya iradiasi gelmbang mikro. Proses pengaktifan menggunakan berbagai daya iradiasi, yaitu 540 watt, 630 watt dan 720 Watt selama 20 menit. Sifat-sifat fisika karbon aktif dikarakterisasi dengan menggunakan mikroskop pindaian elektron, difraksi sinar-X dan daya serap metilen biru. Daya iradiasi gelombang mikro 630 Watt menghasilkan daya serap metilen biru tertinggi yaitu 79,2688 mg/g. Analisis struktur mikro karbon aktif menunjukkan bahwa tingi lapisan (Lc) berbanding terbalik dengan lebar lapisan (La) dan jarak antara lapisan d002 dan d100 tidak bergantung secara signifikan terhadap daya iradiasi gelombang mikro.

UJI DENSITAS DAN POROSITAS SERTA KARAKTERISASI MENGGUNAKAN XRD DAERAH MATA AIR PANAS SEMURUP SUNGAI MEDANG KABUPATEN KERINCI PROVINSI JAMBI Larlen Nixolas; Nova Susanti; Samsidar Samsidar; Linda Handayani
Komunikasi Fisika Indonesia Vol 15, No 1 (2018)
Publisher : Universitas Riau

Test Density and Porosity of rock have been done to see the relation to temperature influence 100 ᵒC, 200 ᵒC and 300 ᵒC. Rocks that will be tested first heated temperature with furnace tool then weighed with a digital balance. Density and Porosity measurement data were analyzed using Matlab Software with ASTMC373 equation. The result of Matlab in the form of graph shows average temperature change to Semurup rock density of 0.03 g / cm3 and the effect of temperature on Semurup rock porosity at 300 ᵒC is 30.29%. The average temperature change to Medang River rock density is 0.003 g / cm3 and the effect of temperature on Medang River rock porosity at 300 ᵒC is 0,55%. Looking at the rock crystal structure used XRD. Data from Characterization using XRD was analyzed with High Score Plus software. The result of rock characterization using XRD, from semurup showed that component of CaCO3 is 94%, crystal structure not yet fully formed and still in amorphous form, meanwhile rock from medang river show that component of CaCO3 is with 98%, crystalline structure have formed crystal.

IMPLEMENTASI JARINGAN SYARAF TIRUAN (JST) DAN PENGOLAHAN CITRA UNTUK KlASIFIKASI KEMATANGAN TBS KELAPA SAWIT Minarni Minarni; Roni Salumbae; Zilhan Hasbi
Komunikasi Fisika Indonesia Vol 15, No 1 (2018)
Publisher : Universitas Riau

The clasification of ripeness stages of oil palm fresh fruit bunches (FFBs) can be done using color parameters. These parameters are often evaluated by human vision, whose degree of accuracy is subjective which can cause doubt in judgement. Automatic clasifications offreshfruit bunches (FFBs) based on color parameters can be done using computer vision. This method is known as a nondestructive, fast and cost effective method. In this research, a MATLAB computer program has been developed which consists of RGB and HSV GUI which is used to record, display, and process FFB image data. The backpropagation artificial neural network (ANN) program is also developed which is used to classify the oil palm fruit fresh bunches (FFBs). Samples are fresh fruit bunches (FFB) of oil palm varieties of Tenera which comprise of Topaz, Marihat, and Lonsum clones. Each clone composed of three levels of ripeness represented by five fractions. The measurements were started by capturing images of oil palm, extracting RGB and HSV values, calculating weight values from the image database to make anANN program, preparing grid programs for oil palm FFBs, and comparing grading levels of oil palm FFBs using program and by harvester. This program successfully classified oil palm (FFBs) into three categories of ripeness which are unripe (F0 and F1), ripe (F1 and F1) and over ripe (F4 and F5). The RGB and HSV programs successfully classified 79 out of 216 FFBs or 36.57% and 106 out of 216 TBS or 49.07%. Respectively the HSV program is better than RGB program because the representation of HSV color space are more understood by human perception hence can be used in calibration and color comparison.

EFEK VARIASI DAYA IRADIASI GELOMBANG MIKRO TERHADAP KARBON AKTIF TONGKOL JAGUNG UNTUK PENJERNIHAN AIR Raysa Fadillah; Rakhmawati Farma; Awitdrus Awitdrus
Komunikasi Fisika Indonesia Vol 15, No 1 (2018)
Publisher : Universitas Riau

The power of microwave irradiation affect the quality of activated carbon. In this research the activated carbon has been made of biomass of corn cob by using carbonization process, chemical activation using potassium hydroxide as the activating agent and microwave irradiation power was variated for 360 watt, 450 watt, 630 watt, dan 720 watt in 15 minutes. The surface morphology of activated carbon for the sample KA720 produced lots of pores more than that of the sample KA360, KA450, and KA630. The sea water that has been mixed with activaed carbon using microwave irradiation power of 720 watt with temperatur of 26oC, and pH of 7,41.

UJI KESESUAIAN BERKAS SINAR-X DENGAN BERKAS KOLIMATOR PADA PESAWAT SINAR-X DI INSTALASI RADIOLOGI RSUD RADEN MATTAHER JAMBI Enggel Fransiska; Nehru Nehru; Muhammad Ficky Afrianto
Komunikasi Fisika Indonesia Vol 15, No 1 (2018)
Publisher : Universitas Riau

The collimator test is one of the X-ray Quality Control (QC) program, one of the central point beam testing and the area of the collimator beam using the RMI unit. The purpose of the collimator test is to find out the suitability of the broad field of collimator with the area of X-ray beam in tolerance of ≤ 2% Focus Film Distance (FFD) and the correspondence of the X-ray center point in tolerance Ɵ = 3˚ as determined by the Minister of Health Decree No . 1250 / SK / XII / 2009. The study was conducted using variations of FFD at 100 Cm, 90 Cm, 80 Cm, on three X-ray radiation radiology radiation RSUD Raden Matther Jambi. In this study using digital radiograph unit (DR) or computed radiographaphy, no longer using conventional radiographs such as previous studies. Irregularities or wide discrepancies in the area of the X-ray beam are evaluated by evaluating the firm boundary of the line formed by the X-axis and Y-axis, then determining the midpoint between the line boundary and the radiation boundary of the scatter. The deviation results concluded that there was no deviation at the central point of X-ray beam for all X-ray aircraft tested by all aircraft still within the tolerance threshold Ɵ = 3˚. But for the value of the collimator area all the X-ray macine tested has deviations exceeding the predefined 2% FFD threshold where the radiologie france plane occurs deviation on the Y axis with FFD 90 Cm and 80 Cm, hyundai medicaly X- ray on X axis with FFD 100 Cm and 80 Cm, Y axis with FFD 80 Cm, and on villa sistei medicali SpA plane on X axis with FFD 80 Cm, Y axis at FFD 80 Cm.

PEMANFAATAN KARBON SEBAGAI FILTER UNTUK PENGENDALIAN PENCEMARAN AIR SUNGAI OLEH LOGAM Zn (seng) DARI LIMBAH PABRIK KELAPA SAWIT DI KABUPATEN KUANSING Riad Syech; Restina Restina; Usman Malik
Komunikasi Fisika Indonesia Vol 15, No 1 (2018)
Publisher : Universitas Riau

A research has been conducated on using charcoal as a filter to control river water pollution with heavy metals from palm oil mill waste based on physical parameters in Kuantan Singingi district using SSA method. The process begin with taking sample from palm iol mill waste output, the the temperature and electrical conductivity of it is mesured. Heavy metal concentration (Zn) is mesured with Atomic Absorption (SSA). The highest electrical conductivity value before filtrasion was found in factory A sampel. The value is 8,87 x 10-4 Ωm-1with 0,241 mg/l Zn concetration. Electrical conductivity value decreased after filtration to 7,11 x 10-4 Ωm-1 with 0,216 mg/l mg/l Zn concetration. While the lowest electrical conductivity value before filtration was found in factory C sample. The value is 4,65 x 10-4 Ωm-1with 0,169 mg/l Zn consetration. Conductivity value decreased after filtration to 4,26 x 10-4 Ωm-1with 0,154 mg/l Zn contretation. These result explain that using charcoal as a filter for pollution control is uqite effective.

PENYELIDIKAN KEBOCORAN PIPA BAWAH TANAH MENGGUNAKAN METODE GEOLISTRIK KONFIGURASI WENNER-SCHLUMBERGER BERDASARKAN MODEL FISIS SKALA LABORATORIUM Dodi Irwan Siregar; Juandi M; Mhd Edisar
Komunikasi Fisika Indonesia Vol 15, No 1 (2018)
Publisher : Universitas Riau

The research has been done using physical modeling of geoelectric configuration application of Wenner-Sclumberger to model the existence of underground pipe leakage. Modeling is done on a tub made of wood and glass which is filled with sand and clay as medium (host-rock) and the inclusion of leaked steel pipe, the first measurement model is done before the fluid flow into the leaking pipe, obtained the type of pipe resistance pattern 2310 Ωm at a depth of 25 cm from the sand surface with an error iteration of 9.5%. The second model is measured by flowing water into the leaking pipe obtained the pattern of resistance around the type of leakage where the leak is lower is between 6.49 - 55.9 Ωm lies in the horizontal range 12.5 - 20.5 cm and in the vertical range 10 - 45 cm from the sand surface with 25.8% error iteration. The third model is measured by flowing kerosene into leaking pipe can be seen clearly the pattern of distribution of resistance type around the leaky pipe is lower 12 - 71.3 Ωm lies in the horizontal range 11 - 19 cm and in the vertical range of 7-25 cm from the surface sand with 15.7% error iteration

ANALISA TINGKAT PENCEMARAN AIR BAWAH TANAH DENGAN METODE GEOLISTRIK KONFIGURASI SCHLUMBERGER DI KECAMATAN TAMPAN KOTA PEKANBARU Juandi M; Usman Malik; Melki Leonardo
Komunikasi Fisika Indonesia Vol 15, No 1 (2018)
Publisher : Universitas Riau

The research analyzing ground water contamination based on Geo-electrical methods near 2 point, that is in Cipta Karya street (without waste pile) and Srikandi street (with waste pile), Kecamatan Tampan Riau. Data was processed using Software Progress, with the results of processing in the form of depth, thickness and number of layers and the resistivity value. Has been done the results obtained showed that the resistivity value on Cipta Karya road without garbage pile was 57.10-4955.00 Ohm.m at depth 0,00-346,00 Meter and on Srikandi street with garbage pile was 68.90-4008.00 Ohm.m at depth 0,00-367,00 Meter. Geo-electrical data measurements in Cipta Karya and Srikandi there are 5 layers of soil, that is cover layer, clay loam layer, alluvium layer, sand layer and bedrock layer. Based on the above resistivity values and depth, all points considered un polluted by leachet because the resistivity value is far above 10 Ohm.m (fresh water). Resistivity values indicate that the leachet does not seep into the soil and spread to swamps which are right next to the garbage pile(Srikandi road).

KAJIAN KOMPUTASI POLA GELOMBANG RESONANSI MAGNET INTI (NMR) DENGAN TRANSFORMASI FOURIER Faprilia Khusnul; Salomo Salomo; Muhammad Hamdi
Komunikasi Fisika Indonesia Vol 15, No 1 (2018)
Publisher : Universitas Riau

Research on nuclear magnetic resonance (NMR) modeling has been done with computational approach. This study aims to determine the shape of signals and spectra of some of the combined nuclear spins. The physical parameters were determined using Fourier transformation equation modeled with the wolfram mathematical software 9.0. The relaxation time of the 1/2 nuclear spin was varied according to the nuclear state of cancer tissue.This produces a cosine wave pattern for the signal at T2 = 0.11 ms. Variations of this in chemical shift (Δ) and J-coupling (J) for modeling were performed in 9 times. The spectrum of one spin is generated at the value of Δ = 0.001 Hz and J = 0 Hz, the spectrum of two spins at Δ = 849,001 Hz and J = 24 Hz. These results can be applied to research interests for the medical world and as reference data for research standards.

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Usman Malik

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Home Page

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Editorial Team

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Contact Name Usman Malik

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Journal Mail Official kfi@ejournal.unri.ac.id

Editorial Address Jurusan FMIPA Universitas Riau Kampus Bina Widya Km 12,5 Simpang Baru Pekanbaru

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Contact Name
Usman Malik

Contact Email
usman.malik@lecturer.unri.ac.id

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+62811756227

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kfi@ejournal.unri.ac.id

Editorial Address
Jurusan FMIPA Universitas Riau Kampus Bina Widya Km 12,5 Simpang Baru Pekanbaru

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Riau

INDONESIA