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Jurnal Online Mahasiswa (JOM) Bidang Teknik dan Sains
Published by Universitas Riau
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Core Subject : Engineering,
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Articles 3,145 Documents
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Optimasi Wireless Access Point Menggunakan Algoritma Genetika (Studi Kasus Gedung C Fakultas Teknik) Muhammad Rasyidin Siregar; Linna Oktaviana Sari
Jurnal Online Mahasiswa (JOM) Bidang Teknik dan Sains Vol 5 (2018): Edisi 1 Januari s/d Juni 2018
Publisher : Jurnal Online Mahasiswa (JOM) Bidang Teknik dan Sains

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Abstract

Laying a good WI-FI system is required to optimize the received power level from the transmitter to receiver. Characteristic of the most influential in determining the performance of a WI-FI system is the power level value. This value can be used to determine the coverage are of a transmitter. The Genetic Algorithm is chosen because according to various references, it is considered a suitable algorithm for optimization related problems. This algorithm can find the best solution of various possible solutions quickly and efficiently than any other algorithm. This research will be doing optimization, by comparing the optimization result with the existing conditions. The purpose of optimization is to rearrange the access point position in order to generate efficient coverage and signal strength. Selected research location is on 1st floor of C building Engineering Faculty, University Riau. From existing condition on the 1st floor there are 5 access points with coverage area value of 29.71%, after optimization the coverage area value increased to 50.21% with signal strength between -75 dBm to -70 dBm.Keyword : Access Point, Genetic Algorithm, Coverage Area, WI-FI, Signal Strength.
Pengaruh Penambahan Pati Jagung Pada Pembuatan Prototipe Tulang Menggunakan Metode Starch Consolidation Agung Prabowo; Ahmad Fadli; Komalasari Komalasari
Jurnal Online Mahasiswa (JOM) Bidang Teknik dan Sains Vol 6 (2019): Edisi 2 Juli s/d Desember 2019
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Abstract

Hydroxyapatite (HA) is a crystalline molecule composed of phosphorus and calcium. One technique for fabricated porous HA is the starch consolidation method. The objective of this study was to determine the effect of starch addition on porous HA. The study was conducted by mixed HA as much as 20 grams with the amount of starch 8, 10, 12 and 14 grams of corn starch, and 25 ml of distilled water to form a slurry. The slurry formed is then stirred at 400 rpm. The mixture is then poured into a mould. Then the mixture in the mould was heated to 100oC for 60 minutes. After that, the green bodies are removed from the mould and dried in an oven at 80°C for 24 hours and 110°C for 8 hours. The dried sample is then put into the furnace. Combustion is carried out at a temperature of 600˚C and ended with sintering at a temperature of 1250˚C each for 1 hour. Increasing the addition of starch causes the greater of the shrinkage and porosity, and the density and bending strength is getting smaller. Sintered bodies show shrinkage in the range of 35.47–47.46%, porosity 22.0-37.75%, density 1.97-2.46 gr / cm3, bending strength 0.33-2.33 MPa and pores size obtained is in the range of 80-150 μm.Keywords: bone replica; hydroxypatite; porosity; starch
Pembuatan Mortar Geopolimer Berbasis Palm Oil Fly Ash-Grafena (Pofa-Grafena) Dengan Variasi Rasio Pofa/Pasir Dan Berat Grafena Yola Bertilsya Hendri; Amun Amri; Rozanna Sri Irianty
Jurnal Online Mahasiswa (JOM) Bidang Teknik dan Sains Vol 5 (2018): Edisi 2 Juli s/d Desember 2018
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Abstract

Geopolymer mortar is a mortar produced by reacting a high concentrated alkaline solution with precursors containing high alumina and silica contents. The use of geopolymer mortar can replace the use of ordinary portland cement (OPC) in the construction industry. Thisresearch aims to synthesize palm oil fly ash (POFA) based geopolymer mortar with the addition of graphene nanosheets, to determine the effect of POFA-to-sand composition ratio, and variations of graphene to mechanical properties and morphology of geopolymer mortar. The research was conducted by varying the ratio of POFA-to-sand (1:0, 1:1, 1:2, and 2:1 by mass ratio), variations of graphene (0, 0,1, 0,35, and 0,5% by weight), curing time (24 h) and curing temperature (60℃). Scannning Electron Microscope (SEM) analysis showed that the addition of sand and graphene reduced the porosity of geopolymer mortar. The compressivestrength test results showed that the highest compressive strength (16,4 MPa) was obtained at POFA-to-sand ratio of 2:1 and 0,5% wt graphene content. While the lowest compressive strength (5,4 MPa) was obtained at the POFA-to-sand ratio of 1:2 and 0% wt graphenecontent.Keywords: alumina, silica, alkaline activator, crystalline, geopolymerization
Desain Dan Analisis Kualitas Pencahayaan Berbasis Perangkat Lunak Dialux Evo 8.1 Riski Febriyursandi; Azriyenni Azhari Zakri; Amir Hamzah
Jurnal Online Mahasiswa (JOM) Bidang Teknik dan Sains Vol 6 (2019): Edisi 2 Juli s/d Desember 2019
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This research develops and implements a method for calculating lighting systems for classrooms at Khairul Ummah Islamic Boarding School. The lumen method is one of the methods used to determine the number of luminaires needed to improve lighting quality according to the SNI 6197: 2011 standard. The number of luminaires obtained in this study was included in the simulation for DIALux evo 8.1 software. The results obtained from this study show that the lighting in the classrooms at MTs and MA Khairul Ummah Islamic Boarding School has not reached the recommended standard for classrooms, where the direct measurement results of the average lighting level of class IX-E is 10.79 lux, while in the class X IPA 3 is 11.66 lux. To improve this condition, class IX-E requires the number of luminaires of 15 points and class X IPA 3 requires a luminaire of 12 points. The difference in results obtained from mathematical calculations using the lumen method and the simulation results of DIALux software for class IX-E is 15.6% and in class X IPA 3 is 3.4%. The value of investment costs is necessary in order to make improvements to the lighting system in these two schools which are worth Rp. 2,700,000.00 to provide 27 Philips LED bulb 27 watt lamps.Keywords: Classroom, DIALux evo 8.1, Investmen Cost, Lighting, Lumen Method
Evaluasi Area Kawasan Keselamatan Operasi Penerbangan (KKOP) Akibat Perubahan Panjang Runway (Studi Kasus : Bandar Udara Internasional Sultan Syarif Kasim II Pekanbaru) Nur Ihsan; Ari Sandhyavitri; Sri Djuniati
Jurnal Online Mahasiswa (JOM) Bidang Teknik dan Sains Vol 4, No 1 (2017): Wisuda Februari Tahun 2017
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Abstract

The objective of the study was to evaluate and to calculate the required the existing 2016 and ultimate 2035 KKOP of Sultan Syarif Kasim II International Airport Pekanbaru. The KKOP area was drawn using ArcGIS Software package, the calculation was carried by using ICAO Manual Standard Annex 14 2013, Ministry Decree Number 60 2004 and Number 3 2016. It is identified that Approach and Take Off Surface in 2016 = 155 meters AES and in 2035 = 152 meters AES, the elevation for inner horizontal surface in 2016 = 50 meters AES and in 2035 = 47 meters AES , the discreapancy for both approach surface elevation of 1,97% to 6,38% for inner horizontal surface. It is also identified that runway length in 2016 = 2.600 meters will be extended to 3.000 meters in 2035, than area of inner horizontal in 2016 = 34.783.800 m2 became in 2035 = 50.300.000 m2, it’s not necessary the change of runway length from 2016 to 2035 affected to unincreased in KKOP elevation usualless KKOP distance length.Key Word: Sultan Syarif Kasim II International Airport, Obstacle Limitation Surface, AES
Analisis Kekeringan Untuk Mitigasi Kebakaran Lahan Gambut Menggunakan Data Satelit Berbasis Sistem Informasi Geografis Hilda Febrina; Sigit Sutikno; Rinaldi Rinaldi
Jurnal Online Mahasiswa (JOM) Bidang Teknik dan Sains Vol 4, No 2 (2017): Wisuda Oktober Tahun 2017
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Abstract

Drought is a problem that occurs in every year whose timing can not be known certainty. Therefore, it is necessary to do drought index analysis to determine the level of drought in order to become early warning of drought. There are several methods that can be done to determine the level of drought of a region, one of them is the SPI (Standardized Precipitation Index) method. The SPI method is a suitable method used to calculate meteorological drought. The SPI method uses rainfall data as its input data. TRMM rainfall data is satellite rainfall data that can be used for calculation of SPI value. The research location is Bukit Batu District, Bengkalis Regency, Riau Province which has been divided into 23 grid with 0.10 x 0.10 grid width. From the results of SPI calculations displayed in the form of graphs can be concluded that each grid has the same trendline. The SPI values that have been obtained are then correlated with the number of hotspots. From 23 grid of Bukit Batu Subdistrict, BB7 grid is the grid with the highest number of hotspots in 2014.Keyword: Drought Index, SPI, TRMM, Hotspot
Deteksi Fenomena Chatter Pada Proses Turning Menggunakan Sinyal Suara Darman Darman; Feblil Huda
Jurnal Online Mahasiswa (JOM) Bidang Teknik dan Sains Vol 5 (2018): Edisi 2 Juli s/d Desember 2018
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Abstract

Chatter is an excessive vibration that occurs due to performing of tools which have a negative effect that causes poor surface quality, disproportionate use of tools, damage to equipment, and etc. By these reasons chatter has became important research area in mechanical engineering to detect its existence in operational condition of machining process. In this research, the chatter detection method by using sound signal was developed. The artificial chatters were then generated by unsharpening the lathe cutting. The uncalabrated microphone which operated by PC and MATLAB software was then used to grap the sound data from operating turning process. The sound signals in normal and chatter condition were then processed to perform sound signal in the time domain, frequency domain, and spectrogram. The existence of chatters was signed by excessive vibration and bad roughness of turning process product. The Spectogram display TF representation, Time-Magnitude domain and 3D spectrogram. TF representation showing magnitude enhancement, that occurs during the chatter. the Time-Magnitude domain showing time span of the chatter and 3D spectrogram can be seen in the contours and characteristics from chatter. From whole of representation, the chatter can be detected.Keywords : Sound Signal, Chatter, Turning Process, Spectrogram
Pengaruh Penggantian Bahan Pengisi Semen Dengan Kombinasi Abu Bata Dan Abu Sekam Padi Pada Campuran Aspal AC-BC Ahmad Fajriman; Alfian Malik; Gunawan Wibisono
Jurnal Online Mahasiswa (JOM) Bidang Teknik dan Sains Vol 5 (2018): Edisi 2 Juli s/d Desember 2018
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Abstract

Portland cement is usually used in asphalt concrete as filler. Brick ash and rice husk have similar chemical compound to portland cement. This research tried to utilize a combination of those ashes to replace cement. The purpose of this research is to determine the Marshall characteristics of asphalt concrete binder course (AC-BC) mixtures using the mixed ash as filler. The mixed of ash contained 40% brick ash and 60% rice husk ash. Ratios of cement and the mixed ash were 100:0, 50:50, 0:100. All samples were made and tested according to Bina Marga 2010 Revision 3 Specification. Based on Marshall characteristics, the addition of brick and rice husk ash increased stability and void filled asphalt (VFA) values, and reduced the air void. Keywords: Rice husk ash, Brick ash, Filler, Asphalt concrete binder course
Kultivasi Mikroalga Chlorella Sp. Secara Fed-Batch Dalam Media POME Sebagai Bahan Baku Bioetanol Dina Citra Naomi Harianja; Sri Rezeki Muria; Chairul Chairul
Jurnal Online Mahasiswa (JOM) Bidang Teknik dan Sains Vol 6 (2019): Edisi 2 Juli s/d Desember 2019
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Bioethanol is an environmental friendly biofuel, one of the raw materials is microalgae, because microalgae can produce carbohydrates which can be used for fermentation in the process of bioethanol production. In this research the microalgae Chlorella sp. cultivated in the palm oil waste media (POME) in a fed-batch culture. The purpose of this researchare study the effect of fed POME media in fed-batch culture on the growth of Chlorella sp., to calculate the specific growth rate of Chlorella sp. microalgae, determine the effect of fed-batch processes on the reduction of POME COD and carbohydrate content of Chlorella sp. Microalgae Chlorella sp. 600 ml with 4.8 x 106 cell density were cultivated for 12 days using bioreactors with addition of waste variations 0.45 L / day, 0.9 L / 2 days and 1.35 L / 3 days, and batch process with addition of 5.4 wastes L. POME COD analysis is carried out at the beginning and end of cultivation, cell density and carbohydrate calculation is performed at each waste addition. The best results were obtained with variations in the addition of POME 0.9 L every 2 days, POME COD of 750 mg / L, and density cel 4.432 x 106 with carbohydrates 190,51 mg / L. Keywords : Chlorella sp., fed-batch cultivation, POME, carbohydrate.
Kinetika Reaksi Demineralisasi Pada Isolasi Kitin Dari Limbah Ebi Yesi Afriani; Ahmad Fadli; Drastinawati Drastinawati
Jurnal Online Mahasiswa (JOM) Bidang Teknik dan Sains Vol 4, No 2 (2017): Wisuda Oktober Tahun 2017
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Abstract

Chitin is a biopolymer, used for various fields like cosmetics, biomedical, porous material, absorbent of heavy metal, and dietary. The synthesized of chitin from ebi’s waste by deproteinization and demineralization process was investigated. The aims of this research is to determine the reaction kinetics of demineralization at isolation of chitin with variables of concentration of HCl and stirring rate. The research was started by mixing ebi’s waste powder with HCl concentration of 0,2 N; 0,6 N; 1 N; 1,4 N; and 1,8 N at temperature 29°C and the stirring rate 50, 100, 150, 200, and 250 rpm in the beaker glass and completely with stirrer. The Samples were taken for 15, 25, 35, 45 and 60 minutes in amount 20 mL, then washed until neutral and filtered by a filter paper. Isolated chitin was destructed by H2SO4 and HNO3 to determine calcium carbonate content by titration of complexometry. The results show that reaction kinetic follows pseudo second order equation. Reaction rate constant increases with increasing concentration. The reaction rate in the concentration 0,2 N; 0,6 N; 1 N; 1,4 N; and 1,8 N and stirring rate 150 rpm increased from 0,003 to 0,404 min-1. But stirring rate undefined by approaching of kinetics homogenous reaction. The Range of reaction rate constant is 0,00167- 0,394 min-1.Keywords : biopolymer, chitin, demineralization, ebi’s waste, reaction kinetic.

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