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Jurnal Online Mahasiswa (JOM) Bidang Matematika dan Ilmu Pengetahuan Alam

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ANALISA PENGARUH VEGETASI TERHADAP TINGKAT KEBISINGAN DI SEPANJANG JALAN RAYA PEKANBARU-BANGKINANG ', Azura; ', Erwin; ', Defrianto
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

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The influence of vegetation such as ketapang, sengon, mango, of acacia, durian andpalm along Pekanbaru-Bangkinang highway against noise level has been studied. Noisesource was originated from sound of vehicles passing through the highway. An instrument used to record the noise level in the study is Sound Level Meter (SLM). In order to obtain the absoption of noise level, then it was used 2 SLMs. The first SLMwas utilized to record the noise directly generated by vehicles without any obstaclesand the second SLM was located behind the trees as sound obstacles. The position ofthose two SLMs was arranged along the road with the distance of about 15 m from thehighway. The next measurement was to record the noise level for one day started from7: 00 a.m until 6: 00 p.m along the highway. The influence of the distance against thenoise level was also studied. The result of this research showed that palm trees has thehighest effect on noise reduction and followed by acacia, mango, durian, sengon andketapang trees. The high absorption of sound by palm tree of about 6.092% because the volume of the palm leaves per percentage of the absorption is smaller compared tothose for other vegetations. These results were compared to those of Maekawa andISO9613 calculation. From the comparison, it was obtained that Maekawa calculation ishigher compared to those of this research, while the ISO9613 calculation was lower.The error percentage of the calculation for Maekawa and ISO9613 was 6.82% and8.76% respectively. The profile of one day noise along the highway as a function of time showed that there were two peaks of noise that were occurred at 09.00-10.00 and17.00-18.00. Moreover, the noise level was reduced very significantly from 71.90dB(A) to 63.58 dB(A) as the measurement away from the noise source.
PEMETAAN TINGKAT KEBISINGAN YANG DITIMBULKAN OLEH MESIN PENGOLAH KELAPA SAWIT DI PT. TASMA PUJA, KABUPATEN KAMPAR-RIAU saputra, Ade; ', Defrianto; Emrinaldi, Tengku
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

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The mapping noise levels generated by the palm oil processing machine in PT. Tasma Puja Kab. Kampar, Riau by using grid method has been conducted . The result was the noise intensity of the lowest to the highest one at 121 points in a safe area. The intensity was described in mapping using "Software Surfer 11", which generates the contour then combine with the location of PT. Tasma Puja indicated by different colors: black, blue, sky blue, green, yellow, red and purple. The highest intensity was located at the coordinates N 010 18.735 and E 1010 01.204, 98 dB was indicated by the color purple which the temperature reaches 400C, the lowest noise intensity is N 010 18.710 and E 1010 01.172 and 46 dB shown by the black color where the temperature reaches 290C. The higher temperature is due to the higher the intensity of the noise. The lower air temperature will have the lower the intensity noise. Based on the results at PT. Tasma Puja, there are several locations has exceeded the value of the noise quality standards established by the labor minister's decision number: KEP-51 / MEN / 1999. i,e 85 dB.
MODEL POLA LAJU ALIRAN FLUIDA DENGAN LUAS PENAMPANG YANG BERBEDA MENGGUNAKAN METODE BEDA HINGGA Marselly, Vira; ', Defrianto; Dewi, Rahmi
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

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The writer has done a research on the model of rate pattern of liquid fluid flow by using flow model that has different pattern. The Equation of continuity was used to solve flow rate case, while Equation of Laplace two dimensions was used for numerical case by finite difference methods by using MATLAB R2009b (version 7.9.0.529). The purpose of fluid research was making flow pattern then analyzing fluid flow to each point in dimensions on Equation of Laplace. The methodology used in this research was evaluating Equation of Laplace concept, identifying the problems, two dimensions of Laplace equation used, completing the numerics by using finite difference methods, and completing analitics for simple cases. The results showed that there was no significant between analytical and computation of fluid flow rate. It can be seen the average of error value is close to zero and the highest error value is 0,000,778 % . Even in various geometry problems, the flow pattern can is be also visualized.
PENGGUNAAN GELOMBANG AKUSTIK PADA PROSES PEMISAHAN PARTIKEL PENGOTOR DALAM AIR DENGAN MENGGUNAKAN TABUNG RESONANSI Mayasari, Lifa Anggar; ', Defrianto; Syech, Riad
Jurnal Online Mahasiswa (JOM) Bidang Matematika dan Ilmu Pengetahuan Alam Vol 1, No 2 (2014): Wisuda Oktober 2014
Publisher : Jurnal Online Mahasiswa (JOM) Bidang Matematika dan Ilmu Pengetahuan Alam

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A research has been done on the use of acoustic waves in order to separate pollutant particles in water. This research has been performed by an experimental method utilizing the second and the third harmonic mode of acoustic waves.  The results showed that the use of both modes was affected by their intensity. It was proved that the treatment of the second harmonic mode wave  yielded the  difference of concentration of water that depended on the intensity level ( IL ) of the wave.  The value of 0.035 mg/L, 0.09 mg/L, and 0.15 mg/L have been found respectively, for the IL of 83.2 dB, 92.4 dB, and 102.3 dB by second harmonic mode treatments to the water of 0.40  mg/L. Meanwhile, the use of the third harmonic mode wave treatments to the same water samples gave the differences of concentration of 0.07 mg/L, 0.11 mg/L, and 0.17 mg/L respectively, for the ILs of 65.9 dB, 75.2 dB, and 84.8 dB. It was showed that the treatment of the third harmonic resulted bigger difference concentration of the samples. The bigger the difference concentration, the better the separation of pollutant particle in the sample. It can be concluded that acoustic waves can  be used to separate the pollutant particles in water.
PENGUKURAN TINGKAT KEBISINGAN DI JALAN RAYA PEKANBARU-BANGKINANG SEBELUM DI BANGUN BEBAS HAMBATAN (HIGHWAY) Akhdesia, Mutiara; ', Erwin; ', Defrianto
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

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Measurement of the noise level in the roadway of Pekanbaru-Bangkinang before building of Highway has been done. The sources of noise originated from the sound of vehicles that passed through the roadway. The level of noise has been measured by using a Sound Level Meter (SLM). The measurement of noise level carried out in two locations, first location was on roadway of Pekanbaru-Bangkinang KM 21 and the second location was at round aboard of Jalan Garuda Sakti and Jalan PekanbaruBangkinang. The noise level at first location was measured as a function of time from 07.00 until 18.00 pm during one week. In this research, the number of vehicles that passed through the first location have been counted every hour. Furthermore, the noise level was measured as a function of distance from the noise source using two SLMs, namely SLM type MS 6701 and SL 4112. The results showed that the noise level at the first location occurred on Saturday and Sunday at 16.00 to 18.00 with the highest value of 79.09 dBA and 78.28 dBA respectively, while the lowest noise value occurred on Friday at 12.00 to 13.00 pm with the value of 67.97 dBA. The highest noise level at the second location occurred at 17.00 to 18.00 with a value of 81.60 dBA. The value of noise level at the second location was higher compared to that of the first location. This was due to more number of vehicles that passed through that location compared to that of the first location. The profile of noise level occurred on Saturday was compared to that of the theoretical calculations. The result showed that both results had a similar characteristics. Moreover, the results of this research showed that the level of noise as a function of distance from the noise source was decrease with increasing the distance. The decrease of the noise level was caused by the absorption of the noise by the surrounding parameters such as air,vegetation and buildings nearby.
PEMODELAN TAPIS FABRY-PEROT PADA SERAT OPTIK DENGAN MENGGUNAKAN FIBER BRAGG GRATING Pramuliawati, Septi; ', Saktioto; ', Defrianto
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

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Fabry-perot filter was successfully developed by a uniform Fiber Bragg Grating in fiber optic. A characterization of Bragg Grating was analyzed by using computational model with second-order of Transfer Matrix Method based on Coupled Mode Theory. The reflectivity, length of grating, and bandwidth were parametrics to determine the performance of single Bragg Grating. The transmission spectrum showed the longer grating is designed, the larger the reflectivity was produced, so that the transmission band was more narrow. The simulation carried out by varying the separation distance between two gratings was alsoevaluated by dual Bragg Grating. The separation distances from 0.5 cm to 9.5 cm with 1 cm length step. The simulation result showed the maximum peak value generated in the transmission spectrum increased directly proportional to the distance between the gratings. Thus, the grating can be applied as a filter.  Only selected wavelength is allowed to transmit the signal until the end of the optical fiber.
ANALISA PENGARUH KEBERADAAN BANGUNAN TERHADAP TINGKAT KEBISINGAN DI SEPANJANG JALAN RAYA PEKANBARU-BANGKINANG Septiana, Sandra; ', Erwin,; ', Defrianto
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

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The influence of the existence of buildings as a barrier on the noiselevel alongPekanbaru-Bangkinang highway had been studied. A source of noise in this researchwas generated by vechicles passing through along the highway. A tool used to record the noise level was Sound Level Meter (SLM). There were two SLMs used in this measurement, where the first SLM wassituated in the back of the building and thesecond SLM waslocated parallel to the first SLM along the highway without anybuildings.There were four types of buildings used as a noise barrier namely buildingmade of concrete, briks, semi-permanent, and wood. The resultsof the measurementshowed that thehighest noise absorption of about 18.15 %was due to the buildingmade from concrete and followed by bricks, semi-permanent, and woodtheir absorptionvalue of 14.36 %, 13.60 %, and 12.15 % respectively. The highestvalue of absorption ofnoise by concrete building was due to small space volume per percentage of noiseabsorption compared to those of other buildings. The results of this research werecompared to those of Maekawa and ISO9613. The noise absorption in this research wasa little bit lower compared to Maekawa calculation and higher than those for ISO9613with the average error percentage of about 3.35 % and 10.56 % respectively. Themeasurement of noise level as a function of time for one day started from 07.00-18.00showed that the noise level profile had two peaks that was at 12.00-13.00 and 16.00-18.00 with the value respectively of 68.89 dBA and 69.20 dBA. The valueof the noiselevel were also studied as a function of distance and its value declinedverysignificantlyfrom 71.07 dBA to 61.47 dBA when the measurement away from the noisesource.