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Usman Malik
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kfi@ejournal.unri.ac.id
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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 20 Documents
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Search results for , issue "Vol 13, No 12 (2016)" : 20 Documents clear
PENGARUH DAYA IRADIASI GELOMBANG MIKRO TERHADAP SIFAT-SIFAT FISIKA KARBON AKTIF KAYU EUCALYPTUS Farma, Rakhmawati
Komunikasi Fisika Indonesia Vol 13, No 12 (2016)
Publisher : Komunikasi Fisika Indonesia

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Abstract

The aim of this research is to determine the influence of microwave irradiation on the physical properties of activated Carbon based Eucalyptus wood. Activated Carbon were prepared from the conventional carbonized of wood Eucalyptus for 1.5 hours and microwave assisted Potassium Hydroxide with ratio of carbon and KOH of 2:1. The samples were irradiated by using the microwave for 20 minutes and the power output of 540; 630 and 720 Watt respectively.The microwave assisted Potassium Hydroxide Carbon activation are influenced of the physical properties of the samples. The higher of output power of irradiation shows the smaller of activated Carbon.The activated Carbon were irradiated with power output of 630 Watt producing the highest percentage of Methilene Blue degradation of 96.859%, where this value is supported by the highest of Lc value of 48.4733Å.] 
KARAKTERISASI DAN SIMULASI DIODA PN MEMPERGUNAKAN ALAT UJI OTOMATIS BERBASIS MIKROKONTROLER ATMEGA8A Oktavia, Dian Putri; Hamzah, Yanuar; Umar, Lazuardi
Komunikasi Fisika Indonesia Vol 13, No 12 (2016)
Publisher : Komunikasi Fisika Indonesia

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An automated test platform for I-U curve diode characterisation based on microcontroller of Atmega8A is presented. Four types of diodes; 1N4007, 1N5401, 1N5392, and 1N4148 were characterized at temperature 303K using step voltage (dU) of 1mV, 5mV, 10mV, 20mV, 50mV, 100mV, and 500mv respectively. The temperature influences on diode was observed by putting diodes in adiabatic temperature chamber at three different temperatures of 313K, 323K, and 333K, the I-U curve of diodes are then measured. The results show an exponentially diodes I-U curve at quadrant I (forward bias region). For diode parameters, the I-U curve were then modeled and simulated after diodes equation and resulted an maximum absolute error 10.57% of full scale measurement
MODEL VOLUME RESAPAN AIR HUJAN PADA SUMUR RESAPAN DI KECAMATAN RUMBAI KOTA PEKANBARU Gultom, Kusnadi; Edisar, Muhammad
Komunikasi Fisika Indonesia Vol 13, No 12 (2016)
Publisher : Komunikasi Fisika Indonesia

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Telah dilakukan penelitian tentang Volume Resapan Air Hujan pada Sumur Resapan di Kecamatan Rumbai Kota Pekanbaru. Perhitungan volume resapan diperoleh menggunakan data geolistrik dua dimensi. Konfigurasi elektroda Schlumberger dengan bentangan sebesar 164 meter. Hasil pengolahan data geolistrik menggunakan software Res2dinv diperoleh nilai tahanan jenis litologi penyusun lapisan-lapisan tanah di daerah pengukuran. Berdasarkan nilai tahanan jenis litologi yang diperoleh, maka diketahui nilai permeabilitas lapisan tanah di daerah penelitian sebesar 75,41 m/hari. Menggunakan data curah hujan rata-rata Kota Pekanbaru dari BMKG sebesar 0,27 mm3/jam maka diperoleh hasil penelitian volume resapan air hujan untuk sumur resapan dimensi satu dengan tipe rumah 36 sebesar 15,23 m3; volume resapan dimensi dua dengan tipe rumah 38; tipe 45; dan tipe 48 diperoleh sebesar 19,58 m3. Sedangkan untuk sumur resapan dimensi IV dengan tipe rumah 54 diperoleh volume resapan air hujan sebesar 40,82 m3. Pemanfaatan air tanah oleh penduduk setempat adalah 8674,02 m3/hari, dan pemanfaatan oleh industri sebesar 0,4 m3/hari.
SIMULASI 3 DIMENSI DISTRIBUSI PANAS PLAT KNALPOT MOBIL UNTUK ELEMEN TERMOELEKTRIK Adli, Wildan; Tambunan, Walfred; Umar, Lazuardi
Komunikasi Fisika Indonesia Vol 13, No 12 (2016)
Publisher : Komunikasi Fisika Indonesia

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Abstract

This study simulates the distribution of heat in the conductor plate micro energy generation based module Thermoelectric Generator (TEG) type 40-40-10 / 100 to optimize the absorption of heat from the vehicle exhaust waste heat. The module has a maximum operating temperature of 423K. The modeling is done using MATLAB with a modified diffusion equation by application of 900K of temperature as boundary condition on the surface of the base plate which is in contact with the heat source. The plate with aluminum material modeled in varies form of solid, hollow, hollow gitter, hollow heatsink, with dimensions of 110mm long, 60mm wide, 30mm thick base and 30mm thick bulge. The best temperature drop obtained for ΔT = 178,67K (19.85%) produced by the shape of a hollow heatsink plate. The resulting temperature of this model is then lowered back with varying types of material such as aluminum, copper, iron, and stainless steel, as well as by varying the number of TEG array that is 1 to 4-arrays, each array consisting of two modules. Drop in temperature that comes closest to the maximum TEG operating temperature is a drop in temperature that generates the final temperature of 402K, which comes from hollow-with-heatsink stainless steel plate with 50mm of thick and 4-arrays formation.
IDENTIFIKASI KUALITAS AIR BERDASARKAN SIFAT FISIK AIR SUNGAI SIAK PEKANBARU Syech, Riad; Emrinaldi, Tengku; Simbolon, Lundu F
Komunikasi Fisika Indonesia Vol 13, No 12 (2016)
Publisher : Komunikasi Fisika Indonesia

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A study concerning the determination of the quality of river water and well water around the river Siak using the experimental method has been investigated. This research was conducted by measuring the electrical properties of water at a temperature of 20 ̊C. The type of water used were water streams, water dug wells and water wells drilled in obtaining seven points. Measurement of the electrical properties of water was done by using multitester associated with power suppy, the plate of Copper (Cu) and Zinc (Zn) as a conductor, and the glass beaker as a container for the sample. The measurement will show voltage and current values. Based on voltage and current values,theycan calculate the value of the electrical properties of each sample. Results of river water has a resistance value of 2255.46 Ω, resistivity of 213.14 Ωm, conductivity of 0.00530(Ωm)-1, and power of 3.81 x 10-5 W. The electrical properties of best water wells dug well is six with a resistance value of 3136.46 Ω, resistivity 296.39 Ωm, conductivity of 0.00345 (Ωm)-1, and power of 7.85 x 10-5 W. Based on the results, the value of the electrical properties of the best water is the average electrical properties of water well three (drilled wells) with a resistance value of 3538.61 Ω, the electrical resistivity value of 334.39 Ωm, the electrical conductivity value of 0.00341 (Ωm)-1, and electric power of 4,76x10-5W. The water is suitable for consumption having a resistivity of 3x103 Ω, and the electrical conductivity of (300 to 500) x10-6 (Ωm)-1. Based on the standard resistivity and electrical conductivity, the river and well water samples are unfit for human consumption because the values are still far from the exposure limits.
PENGOLAHAN ISYARAT METODE DIFERENSIAL UNTUK LINIERISASI SENSOR KOIL DATAR Pertiwi, Kisna; Malik, Usman; Umar, Lazuardi
Komunikasi Fisika Indonesia Vol 13, No 12 (2016)
Publisher : Komunikasi Fisika Indonesia

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Abstract

Flat coil sensor works by evaluating changes the mutual inductance of the measuring object immersed in a magnetic field of coil. The spiral coil detects without a physical contact with object made on FR4 Printed Circuit Board (PCB). LC-oscillators are used to evaluate change the inductances of two identical sensors in a differential structure with a measured object of copper beryllium (CuBe) moving parallel between the sensors. Flat coil evaluation sensor using LC oscillator produces the eigen frequency of 1MHz up to 2MHz. The linearization of flat coils are carry out using output differential between two oscillator and shown a linear output.
PERUBAHAN KUAT MEDAN MAGNET SEBAGAI FUNGSI JUMLAH LILITAN PADA KUMPARAN HELMHOLTZ Ardiyani, Ginisa
Komunikasi Fisika Indonesia Vol 13, No 12 (2016)
Publisher : Komunikasi Fisika Indonesia

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Telah dilakukan penelitian tentang rancang bangun dan analisis kumparan Helmholtz yang dibuat dengan diameter 13 cm dan jumlah lilitan yang bervariasi yaitu dari : 50, 100, 150, 200 dan 250 lilitan. Medan magnetik yang ditimbulkan oleh kumparan ini diukur menggunakan probe magnetik pasco PS-2162 sebagai fungsi arus, jarak dan jumlah lilitan. Nilai maksimum medan magnetik yang dihasilkan pada pusat kumparan Helmholtz standar dengan arus sebesar 2 A adalah sebesar 7.156 x 10-5 T sedangkan untuk kumparan Helmholtz yang dibuat adalah 5.907 x 10-5T. Kenaikan jumlah lilitan dan kuat arus mengakibatkan medan magnetik juga semakin besar, untuk kumparan dengan jumlah lilitan 50 dan 250 yang dialiri arus sebesar 1.0 A menghasilkan medan magnetik masing-masing sebesar 5.241 x 10-5T dan 6.208 x 10-5T. Pertambahan ini sesuai dengan yang diharapkan dimana medan magnetik nilainya berbanding lurus dengan arus (I) dan jumlah lilitan (N). Nilai medan magnetik menurun ketika jarak semakin jauh dari pusat kumparan dalam arah horizontal dan vertikal.
POLA ALIRAN AIR BAWAH TANAH DI PERUMNAS GRIYA BINA WIDYA UNRI MENGGUNAKAN METODE GEOLISTRIK KONFIGURASI ELEKTRODA SCHLUMBERGER Edisar, Muhammad; Damayana, Listia
Komunikasi Fisika Indonesia Vol 13, No 12 (2016)
Publisher : Komunikasi Fisika Indonesia

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The research about groundwater flow pattern in Perumnas Griya Bina Widya UNRI Tampan subdistrict of Pekanbaru have been done. Groundwater flow pattern mode from one dimension geoelectric data of Schlumberger electrode configuration. Based on formation of lithology resulted from geoelectric data, resulted four formation of lithology from block A to block G of the Perumnas. From the mapping resulted groundwater flow pattern on the first formation layer groundwater flow from northeast to south the to the southwest with 10 – 39.1 meters of thickness of layers. On the second formation groundwater flow from the northeast to north the to the south with 8 – 52.8 meters of thickness of layers. The groundwater flow thrith layers from the northeast to the southeast thickness in this layers 2.5 – 75.8 meters. Forwhile groundwater flow on the fourth layers from the north to the southeast by the thickness from 3.5 – 79.1 meters.
PENENTUAN LAJU PENURUNAN KADAR AIR OPAK SINGKONG DENGAN MENGGUNAKAN RUANG PENGERING BERENERGI BIOMASSA LIMBAH PELEPAH KELAPA SAWIT Malik, Usman; Sihotang, Weldo
Komunikasi Fisika Indonesia Vol 13, No 12 (2016)
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The research was conducted to determine the declining rate water content of cassava using biomass energy from palm fronds. Drying is done by using a drying chamber with a length of 130 cm, width 90 cm and high 120 cm. The drying chamber is formed in such a manner that is equipped with a chimney, two-level drying rack and 2 drums as heat sources. Drying heat sources derived burning biomass from palm fronds in the drum. The room walls are made of plywood with thickness of 8 mm and coated zinc plate with a thickness of 1 mm which is painted black. Samples were dried cassava is opaque and produced in Rejosari Village, District Tenayan Raya, Pekanbaru. First mass each opaque cassava in the rack 1 at 44.13 grams, 41.99 grams, and 46.27, while in the rack 2 of 47.66 grams, 45.02 grams and 45.98 grams. Drying is carried out for 100 minutes with 10 minute intervals where the room temperature is set about 50 ° C to 65 ° C. The decline in the water content on average on both a rack every 10 minutes for observation 100 minutes are 15.30%, 10.62%, 8.84%, 7.17%, 6.40%, 5.78%, 4.71%, 3.74%, 2.75%, 2.52%.
SIMULASI FIBER COUPLER KOMBINASI SERAT MODA TUNGGAL DAN SERAT KISI BRAGG UNTUK KOMPONEN SENSOR OPTIK Meri, Ros
Komunikasi Fisika Indonesia Vol 13, No 12 (2016)
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Fiber coupler was successfully developed by combining single mode fiber and fiber Bragg grating. A characterization of fiber coupler was analyzed based on result simulation by using OptiGrating software with varying long grating 1 ×104

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