cover
Article Per Year (5 Year)
All
Home Page
OAI Link
Editorial Team
Contact
Reviewer
Google Scholar
Contact Name
-
Contact Email
-
Phone
-
Journal Mail Official
-
Editorial Address
-
Location
Kota pekanbaru,
Riau
INDONESIA
Jurnal Online Mahasiswa (JOM) Bidang Matematika dan Ilmu Pengetahuan Alam
Published by Universitas Riau
ISSN : -     EISSN : -     DOI : -
Core Subject : Education,
Mathematics
Arjuna Subject : -
Articles 424 Documents
 39   40   41   42   43 
PENGARUH KETEBALAN BAHAN ALUMINIUM TERHADAP INDUKSI MAGNETIK YANG DITIMBULKAN OLEH TELEPON SELULER Lendra Kusma; Erwin '; Salomo '
Jurnal Online Mahasiswa (JOM) Bidang Matematika dan Ilmu Pengetahuan Alam Vol 2, No 1 (2015): Wisuda Februari 2015
Publisher : Jurnal Online Mahasiswa (JOM) Bidang Matematika dan Ilmu Pengetahuan Alam

Show Abstract | Download Original | Original Source | Check in Google Scholar

Abstract

Nowadays, a cellular phone is an important communication tool therefore, biologically the electromagnetic radiation produced from the cellular phone on the users become relevant. The measurement of magnetic induction generated by three brands namely A, B and C of cellular phone was carried out. The measurement was done for two directions such as horizontal and vertical direction. In order to investigate the effect of alumunium thickness on magnetic induction, several slabs of alumunium with the thichness of 1 mm – 4 mm were prepared. An instrument used for measuring the magnetic induction was magnetic sensors Pasco 2162. The magnetic induction was measured in horizontal direction at a distance of 0,5 cm from cellular phone with and without using an aluminium slab. The results showed that the magnetic induction in horizontal direction generated by cellular phone brand A is highest among A, B and C with the value of 1,09x10-4 Tesla, 1,07x10-4 Tesla, 9,75x10-5 Tesla respectively. The value of magnetic induction generated by a cellular phone reduces when a slab of alumunium was inserted between cellular phone and sensor. The measurement of the magnetic induction in a vertical direction shows that the further distance of the sensor to the cellular phones and the smaller the magnetic induction observed. The result also showed that the value of magnetic dipole moment of cellular phone based on the plot of magnetic induction versus distance is 1 Am2.
KONVERSI ENERGI ANGIN MENJADI ENERGI LISTRIK DALAM SKALA LABORATORIUM Febrielviyanti '; Maksi Ginting; Zulkarnain '
Jurnal Online Mahasiswa (JOM) Bidang Matematika dan Ilmu Pengetahuan Alam Vol 2, No 1 (2015): Wisuda Februari 2015
Publisher : Jurnal Online Mahasiswa (JOM) Bidang Matematika dan Ilmu Pengetahuan Alam

Show Abstract | Download Original | Original Source | Check in Google Scholar

Abstract

The convertion of wind energy into electrical energy in laboratory is experimentally conducted, to the source of the wind came from the fan, which then flowed into a tunnel. The generator used is bicycle dynamo with voltage output of 12 Volt. The wind speed against the tunnel lenght increases when the length are 0,90 m, 0,75 m, and 0,60 m, and decrease on 0,45 m and 0,30 m. The decrease of wind speed occur because of fan vibration, unregularity of tunnel surface area and turbulence. The wind speed is observed to be the largest on the length of 0,60 m with the wind speed at the level of the third button of fan its average speed of 4,16 m/s with generator power, torque and efficiency are 9,47× 10−3 Watt, 2,63× 10−1 Nm and 0,30% respectively. The current and voltage output produced by generator is AC current and voltage and resulte 72,85 mA dan 0,13 Volt, therefore to convert they into DC current and voltage output, effective current and voltage equation is applied which get 0,05 Ampere and 0,09 Volt.
PEMODELAN ADD-DROP MICRORING RESONATOR DALAM MEMPEROLEH HARGA KECEPATAN DATA DAN DAYA UNTUK SISTEM KOMUNIKASI SERAT OPTIK ', Hotmariani; ', Saktioto; Irawan, Dedi
Jurnal Online Mahasiswa (JOM) Bidang Matematika dan Ilmu Pengetahuan Alam Vol 2, No 1 (2015): Wisuda Februari 2015
Publisher : Jurnal Online Mahasiswa (JOM) Bidang Matematika dan Ilmu Pengetahuan Alam

Show Abstract | Download Original | Original Source | Check in Google Scholar

Abstract

Add-drop microring resonator is designed by using Single Mode Fiber (SMF) with the wavelength range from 1.30 to 1.35 micrometer, clutch coeficient varied with the value of 0.25/mm, 0.3/mm, 0.5/mm and 0.7/mm. The research is to obtain the magnification power and baud rate using Matlab R2012B and calculation of physical parameter characterizing microring resonator. The result obtained in this study shows that the value of power changes 0.77263 dB, 0.0016 dB, 0.0124 dB and 0.0475 dB and the value of baud rate is0.91548 nm, 1.3183 nm, 3.662 nm dan 7.1774 nm respectively. The results show that the Free Spectral Range (FSR) is unchanged, Full Width Half Maximum (FWHM) is increasing for coupling coeficient of 0.7 /mm, while Finesse and Quality Factor have the largest value in the coupling coeficient of 0.25 /mm.
KARAKTERISTIK SPEKTRUM KEBISINGAN KENDARAAN SAAT BERHENTI Dewi Muliana; Juandi '; Sugianto '
Jurnal Online Mahasiswa (JOM) Bidang Matematika dan Ilmu Pengetahuan Alam Vol 2, No 1 (2015): Wisuda Februari 2015
Publisher : Jurnal Online Mahasiswa (JOM) Bidang Matematika dan Ilmu Pengetahuan Alam

Show Abstract | Download Original | Original Source | Check in Google Scholar

Abstract

The Characteristics of Noise Spectrum for Vechicle at Rest condition at Jalan Soekarno Hatta, Pekanbaru, Indonesia. The research methodology uses Digital Voice Recorder experimentally and a GoldWave Software computes by a recorder. The measurement of noiseis detected at rest vehicle in four position having densed noise. First position has high peak and amplitude at Jalan Tuanku Tambusai 1. The other positions have low peak and amplitude at Jalan Soekarno Hatta 1, Jalan Tuanku Tambusai 2 and Jalan Soekarno Hatta 2 respectively. Noise signal is then evaluated at frequency 20 Hz - 20,000 Hz for all position. The intensityat position I has -85.0584 dB until -29.4942 dB, position II has -47.7043 dB until -84.5914dB , position III has -74.7860 dB until -46.7704 dB and position IVhas -74.7860 dB until - 46.3035 dB. The average noise spectrum intensity of vehicle against frequency y=Ax+B, where y is avarege spectrum intensity and x is frequency. The details is at position I (y=- 0.002x-35.93), at position II (y=-0.001x-52.01), at position III (y=-0.000x-54.81) and at position IV (y=-0.001x-50.24). In conclution, the spectrum of vehicle stop condition has low intensity.
PENENTUAN GELOMBANG SOLITON PADA FIBER BRAGG GRATING DENGAN MENGGUNAKAN METODE STEP-SPLIT Siahaan, Theresa Febrina; ', Saktioto; Edisar, Muhammad
Jurnal Online Mahasiswa (JOM) Bidang Matematika dan Ilmu Pengetahuan Alam Vol 2, No 1 (2015): Wisuda Februari 2015
Publisher : Jurnal Online Mahasiswa (JOM) Bidang Matematika dan Ilmu Pengetahuan Alam

Show Abstract | Download Original | Original Source | Check in Google Scholar

Abstract

The determination of wave solitons in Fiber Bragg Grating by using the Step- MethodSplit has been done. This research was conducted by simulating wave using computer software namely MATLAB R2011a. The wave soliton model then used parameters such as the alpha value of 0.75 dB/km, 1 dB/km, betha value of 0.75 ps2/km, and gamma value0.25 W-1 km-1, 0.5 W-1 km-1. The results obtained from this parameter changes produced in the form of voltage amplitude to see potential changes in wave soliton. This research also aims to solve Nonlinear Schrodinger Equation by using the Step Method-Split that can be solved by changing the parameters such as the value of the Fourier with a value of 200 and 300 and 15 ps window size, resulting in a 20 ps. The simulation input and output power of a soliton solve with a nonlinear Kerr effect. The effects of dispersion can be compensated so as to obtain a steady pulse.
PENENTUAN TINGKAT KEBISINGAN PADA PABRIK KELAPA SAWIT PT TASMA PUJA KECAMATAN KAMPAR TIMUR Jasmareni Sri Kurniati Baalijas; Juandi '; Sugianto '
Jurnal Online Mahasiswa (JOM) Bidang Matematika dan Ilmu Pengetahuan Alam Vol 2, No 1 (2015): Wisuda Februari 2015
Publisher : Jurnal Online Mahasiswa (JOM) Bidang Matematika dan Ilmu Pengetahuan Alam

Show Abstract | Download Original | Original Source | Check in Google Scholar

Abstract

The noise levels generated by the palm oil processing machine are demonstrated. Noise level measurement was done at different positions in the engine room area (location 1) and the office area (location 2) by using a Sound Level Meter (SLM) SL 4112. The results showed that the intensity of the noise caused by the engine plant in location 1produce the maximum value of 93.68 dB on Wednesday and 91.99 dB minimum value on Monday, while the second location has maximum value is 71.72 dB on Saturday and the minimum value is 68,63 dB on Monday for duration one week. This difference is due to the accumulation of noise levels with increasing time and background activities that can affect the value of the measurement. Measurements were carried out during one week on the average value of 93.68 dB at location 1 and 71.72 dB at location 2.
RANCANG BANGUN SISTEM DETEKSI POLA FRINJI UNTUK INTERFEROMETER MICHELSON Eka Buanti; Minarni '; Walfred Tambunan
Jurnal Online Mahasiswa (JOM) Bidang Matematika dan Ilmu Pengetahuan Alam Vol 2, No 1 (2015): Wisuda Februari 2015
Publisher : Jurnal Online Mahasiswa (JOM) Bidang Matematika dan Ilmu Pengetahuan Alam

Show Abstract | Download Original | Original Source | Check in Google Scholar

Abstract

Instrument used to precisely measure the wavelength of a laser light is known as a wavemeter. One of very important wavemeter parts is a fringe counting circuit. In this research a fringe counting circuit has been built and characterized using a Michelson Interferometer. The circuit system contained three parts i.e a current to voltage converter circuit for a photodiode, a TTL converter circuit, and a counting circuit. The circuits were characterized using two He-Ne laser with two different laser powers 1 mW and 5 mW which were used as the light source for a Pasco Michelson Interferometer. Two photodiodes with two different sensitive areas 100 mm2 and 7.5 mm2 were used. The research results showed that 1 mW Pudak He Ne laser resulted 2 µA for dark fringe and 8 µA for bright fringe when using 7.5 mm2 photodiode active area, then 3 µA for dark fringe and 400 µA for bright fringe when using 100 mm2 photodiode. The results for Meredith He Ne laser resulted 2 µA for dark fringe and 14 µA for bright fringe when using 7.5 mm2 photodiode, then 50 µA for dark fringe and 8000 µA for bright fringe when using 100 mm2 photodiode. The I toV converter which was designed produced voltage bigger than 5 V when using 100 mm2 photodiode. The counter circuit resulted 3.2 V TTL signal output for 200 mV TTL signal input with the same frequency.
ANALISA SPEKTRUM DAN PANJANG KOHERENSI BEBERAPA JENIS LAMPU MENGGUNAKAN SPEKTROSKOP PRISMA DAN INTERFEROMETER MICHELSON Maria '; Minarni '; Walfred Tambunan
Jurnal Online Mahasiswa (JOM) Bidang Matematika dan Ilmu Pengetahuan Alam Vol 2, No 1 (2015): Wisuda Februari 2015
Publisher : Jurnal Online Mahasiswa (JOM) Bidang Matematika dan Ilmu Pengetahuan Alam

Show Abstract | Download Original | Original Source | Check in Google Scholar

Abstract

There are three types of commercial lamps available today which are incandescent lamp (light bulb) , fluorescent lamp or Compact Fluorescent Lamp (CFL), and Light Emitting Diode (LED). The three types of lamps can be distinguished by some aspects such as their efficiency, color spectrum, and coherence. This research aimed to obtain and differentiate the color spectrum and coherence of the three kind of lamps. The spectrums were obtained using a prism spectroscope while the coherence levels were analyzed using a Pasco Michelson interferometer. The samples were the three types of lamps with the same power of 5 Watt and CFL lamps with three different power of 5 Watt, 26 Watt, and 45 Watt. The spectrum and fringe pattern of the lamps were captured using a CCD camera and processed by imageJ software. The research results showed that the color spectrum of light bulb and LED produced a continuous spectrum. While the light of light bulb was dominant at red color and LED light at blue color. CFL light spectrums were partly continuous and dominant also in blue color. The different power of CLF produced different brightness, however the spectrum was still dominant in blue. Coherence of the three type of lamps was different as shown in the fringe pattern obtained. CFL produced fringe pattern with high visibility which showed higher coherence than that of LED and light bulb.
PENUMBUHAN NANOPARTIKEL TITANIUM DIOKSIDA PADA SUBSTRAT FTO DENGAN METODE ELEKTRODEPOSISI Saidatun Khofifah; Iwantono '; Awitdrus '
Jurnal Online Mahasiswa (JOM) Bidang Matematika dan Ilmu Pengetahuan Alam Vol 2, No 1 (2015): Wisuda Februari 2015
Publisher : Jurnal Online Mahasiswa (JOM) Bidang Matematika dan Ilmu Pengetahuan Alam

Show Abstract | Download Original | Original Source | Check in Google Scholar

Abstract

TiO2 nanoparticles have been grown successfully by electrodeposition method on the surface of Fluorine Tin Oxide (FTO) substrate. The growth of TiO2 nanoparticles was done by using voltage of 2 Volt, 6 Volt, 10 Volt, 14 Volt and 18 Volt. This TiO2 was also demonstrated with two different temperature 37 oC and 50 oC. The samples were characterized by UV-Vis spectroscopy, X-ray Diffraction, Scanning Electron Microscope (SEM) and Energy Dispersion X-ray (EDX). The results of UV-Vis showed that TiO2 nanoparticles have the highest absorption at 18 Voltage. The result of XRD at 18 Volt showed that TiO2 has 5 peaks at 2θ: 25,497o, 38,176o, 38,176o, 51,887o, 54,911 o, and 62,093 o, with their crystal plane (1 1 1), (2 1 1 ), (2 2 2), (3 2 0), (4 0 0). The results of SEM showed that nanoparticles form is nearly spherical at a magnification of 35000 times. The results of EDX of the review indicate that Ti atoms have a percentage atomic of 17.66% and O of 70,39%.
ESTIMASI PERMEABILITAS RESERVOIR DARI DATA LOG MENGGUNAKAN JARINGAN SYARAF TIRUAN PADA FORMASI MENGGALA PT CHEVRON PACIFIC INDONESIA Liana Zamri; Juandi M; Muhammad Edisar
Jurnal Online Mahasiswa (JOM) Bidang Matematika dan Ilmu Pengetahuan Alam Vol 2, No 1 (2015): Wisuda Februari 2015
Publisher : Jurnal Online Mahasiswa (JOM) Bidang Matematika dan Ilmu Pengetahuan Alam

Show Abstract | Download Original | Original Source | Check in Google Scholar

Abstract

A research has been conducted to apply artificial neural network in order to predict permeability of reservoir. Method of this research was analytical description. Backpropagation neural network used input layer of 4 neurons, hidden layer of 6 neurons, and output layer of 1 neuron, which was optimal architecture in this research. Result of this research showed that the biggest correlation was 0,9999 for BL#33 well and the lowest correlation was 0,9977 for BL#19 well. The rmse value of BL#19 well was 1,02%, BL#33 well was 0,21%, and was 2,42% for BL#34 well. When rmse decreased, prediction disposed approximated true value. This results indicated the solution based on backpropagation model was reasonable and feasible.

Page 41 of 43 | Total Record : 424

 39   40   41   42   43 

Filter by Year

2014 2015


Reset
Filter By Issues
All Issue Vol 2, No 2 (2015): Wisuda Oktober 2015 Vol 2, No 1 (2015): Wisuda Februari 2015 Vol 1, No 2 (2014): Wisuda Oktober 2014 Vol 1, No 2 (2014): Wisuda Oktober 2014 Vol 1, No 1 (2014): Wisuda Februari 2014 Vol 1, No 1 (2014): Wisuda Februari 2014