Komunikasi Fisika Indonesia
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).
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<![CDATA[UJI DENSITAS DAN POROSITAS SERTA KARAKTERISASI MENGGUNAKAN XRD DAERAH MATA AIR PANAS SEMURUP SUNGAI MEDANG KABUPATEN KERINCI PROVINSI JAMBI ]]>
<![CDATA[Larlen Nixolas]]>;
<![CDATA[Nova Susanti]]>;
<![CDATA[Samsidar Samsidar]]>;
<![CDATA[Linda Handayani]]>
<![CDATA[ Komunikasi Fisika Indonesia Vol 15, No 1 (2018) ]]>
Publisher : <![CDATA[Universitas Riau ]]>
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DOI: 10.31258/jkfi.15.1.84-87
<![CDATA[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.]]>
<![CDATA[IMPLEMENTASI JARINGAN SYARAF TIRUAN (JST) DAN PENGOLAHAN CITRA UNTUK KlASIFIKASI KEMATANGAN TBS KELAPA SAWIT ]]>
<![CDATA[Minarni Minarni]]>;
<![CDATA[Roni Salumbae]]>;
<![CDATA[Zilhan Hasbi]]>
<![CDATA[ Komunikasi Fisika Indonesia Vol 15, No 1 (2018) ]]>
Publisher : <![CDATA[Universitas Riau ]]>
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DOI: 10.31258/jkfi.15.1.36-45
<![CDATA[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.]]>
<![CDATA[EFEK VARIASI DAYA IRADIASI GELOMBANG MIKRO TERHADAP KARBON AKTIF TONGKOL JAGUNG UNTUK PENJERNIHAN AIR ]]>
<![CDATA[Raysa Fadillah]]>;
<![CDATA[Rakhmawati Farma]]>;
<![CDATA[Awitdrus Awitdrus]]>
<![CDATA[ Komunikasi Fisika Indonesia Vol 15, No 1 (2018) ]]>
Publisher : <![CDATA[Universitas Riau ]]>
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DOI: 10.31258/jkfi.15.1.56-61
<![CDATA[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. ]]>
<![CDATA[UJI KESESUAIAN BERKAS SINAR-X DENGAN BERKAS KOLIMATOR PADA PESAWAT SINAR-X DI INSTALASI RADIOLOGI RSUD RADEN MATTAHER JAMBI ]]>
<![CDATA[Enggel Fransiska]]>;
<![CDATA[Nehru Nehru]]>;
<![CDATA[Muhammad Ficky Afrianto]]>
<![CDATA[ Komunikasi Fisika Indonesia Vol 15, No 1 (2018) ]]>
Publisher : <![CDATA[Universitas Riau ]]>
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DOI: 10.31258/jkfi.15.1.77-83
<![CDATA[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.]]>
<![CDATA[PEMANFAATAN KARBON SEBAGAI FILTER UNTUK PENGENDALIAN PENCEMARAN AIR SUNGAI OLEH LOGAM Zn (seng) DARI LIMBAH PABRIK KELAPA SAWIT DI KABUPATEN KUANSING ]]>
<![CDATA[Riad Syech]]>;
<![CDATA[Restina Restina]]>;
<![CDATA[Usman Malik]]>
<![CDATA[ Komunikasi Fisika Indonesia Vol 15, No 1 (2018) ]]>
Publisher : <![CDATA[Universitas Riau ]]>
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DOI: 10.31258/jkfi.15.1.28-35
<![CDATA[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.]]>
<![CDATA[PENYELIDIKAN KEBOCORAN PIPA BAWAH TANAH MENGGUNAKAN METODE GEOLISTRIK KONFIGURASI WENNER-SCHLUMBERGER BERDASARKAN MODEL FISIS SKALA LABORATORIUM ]]>
<![CDATA[Dodi Irwan Siregar]]>;
<![CDATA[Juandi M]]>;
<![CDATA[Mhd Edisar]]>
<![CDATA[ Komunikasi Fisika Indonesia Vol 15, No 1 (2018) ]]>
Publisher : <![CDATA[Universitas Riau ]]>
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DOI: 10.31258/jkfi.15.1.1-5
<![CDATA[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]]>
<![CDATA[ANALISA TINGKAT PENCEMARAN AIR BAWAH TANAH DENGAN METODE GEOLISTRIK KONFIGURASI SCHLUMBERGER DI KECAMATAN TAMPAN KOTA PEKANBARU ]]>
<![CDATA[Juandi M]]>;
<![CDATA[Usman Malik]]>;
<![CDATA[Melki Leonardo]]>
<![CDATA[ Komunikasi Fisika Indonesia Vol 15, No 1 (2018) ]]>
Publisher : <![CDATA[Universitas Riau ]]>
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DOI: 10.31258/jkfi.15.1.23-27
<![CDATA[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).]]>
<![CDATA[KAJIAN KOMPUTASI POLA GELOMBANG RESONANSI MAGNET INTI (NMR) DENGAN TRANSFORMASI FOURIER ]]>
<![CDATA[Faprilia Khusnul]]>;
<![CDATA[Salomo Salomo]]>;
<![CDATA[Muhammad Hamdi]]>
<![CDATA[ Komunikasi Fisika Indonesia Vol 15, No 1 (2018) ]]>
Publisher : <![CDATA[Universitas Riau ]]>
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DOI: 10.31258/jkfi.15.1.17-22
<![CDATA[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.]]>
<![CDATA[PENGARUH HAMBATAN INTERNAL TERHADAP DAYA OUTPUT ELEMEN TERMOELEKTRIK GENERATOR TIPE 10W-4V-40s ]]>
<![CDATA[Eri Wiyadi]]>;
<![CDATA[Lazuardi Umar]]>
<![CDATA[ Komunikasi Fisika Indonesia Vol 15, No 1 (2018) ]]>
Publisher : <![CDATA[Universitas Riau ]]>
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DOI: 10.31258/jkfi.15.1.67-70
<![CDATA[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.]]>
<![CDATA[STUDI SIFAT MAGNETIK DAN UKURAN PARTIKEL ABU VULKANIK ERUPSI GUNUNG SINABUNG KABUPATEN KARO MENGGUNAKAN PROBE PASCO 2162 ]]>
<![CDATA[Salomo Salomo]]>;
<![CDATA[Serima Apriani Purba]]>;
<![CDATA[Riad Syech]]>
<![CDATA[ Komunikasi Fisika Indonesia Vol 15, No 1 (2018) ]]>
Publisher : <![CDATA[Universitas Riau ]]>
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DOI: 10.31258/jkfi.15.1.6-12
<![CDATA[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).]]>
