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INDONESIA
Jurnal Online Mahasiswa (JOM) Bidang Teknik dan Sains
Published by Universitas Riau
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Articles 3,145 Documents
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Analisa Kondisi Lingkungan Di PT. X Ambarwati, Nandia Rian; Sasmita, Aryo; Asmura, Jecky
Jurnal Online Mahasiswa (JOM) Bidang Teknik dan Sains Vol 6 (2019): Edisi 1 Januari s/d Juni 2019
Publisher : Jurnal Online Mahasiswa (JOM) Bidang Teknik dan Sains

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Abstract

PT. X in its operational activities has the potential to generate noise coming from palm oil production machines. Workers who are constantly exposed to noise have the potential to affect their health and comfort. The purpose of this research is to know the intensity of noise generated by oil palm production machine, exposure time, mapping of noise distribution pattern, and noise control effort. Meteorological data includes temperature, humidity, wind speed and wind direction. Meteorological data includes temperature, humidity, wind speed and wind direction. From the measurement results of the area temperature 38 0C, while for the ISBB (wet ball temperature index) conditions at the work location must not exceed 26.7 ° C. measurement of air humidity is 80.2%, and for the provision of humidity levels of air humidity in the work environment up to 90% can be tolerated. And the results of the measurement of wind speed obtained are 1.1 m / s for wind speed itself is one of the medium of sound mediation. Keyword : Wind speed, air humidity, temperature
Aktivasi Klinker Semen Sebagai Katalis Pada Proses Produksi Biodiesel Dari Minyak Sawit Off Grade Miftahudin, Dhani Nur; Helwani, Zuchra; Bahri, Syaiful
Jurnal Online Mahasiswa (JOM) Bidang Teknik dan Sains Vol 6 (2019): Edisi 1 Januari s/d Juni 2019
Publisher : Jurnal Online Mahasiswa (JOM) Bidang Teknik dan Sains

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Abstract

Clinker cement is a solid material activated by calcinations method. The optimum condition studied by a variation of calcinations time. The catalyst with highest activity is obtained when the calcinations time is 5 hours and calcinations temperature is 700 °C with transesterificationreaction conditions are a molar ratio of methanol/oil 6:1, catalyst dosage of 2% y weight, temperature of 70 °C for 2 hours with yield biodiesel result reached 84,26%. CaO, SiO2, 2CaO.SiO2 and 3CaO.SiO2 materials found in the catalyst thrugh x-ray diffraction (XRD) analysis and specific surface area of catalyst is 25,497 m2/g through Brunauer-Emmett-Teller(BET) analysis. Some of metil ester such as methyl palmitate, methyl oleate, methyl stearic, methyl myristate, and methyl laurate are found through Gas Chromatography-MassSpectrometry (GC-MS) analysis.Keywords: biodiesel, calcium oxide, catalysts, cement clinker, transesterification.
Perhitungan Jumlah Kendaraan Bermotor Di Kecamatan Mandau dengan Menggunakan Metode Traffic Counting Fatatulkhairani Fatatulkhairani; Aryo Sasmita; Muhammad Reza
Jurnal Online Mahasiswa (JOM) Bidang Teknik dan Sains Vol 6 (2019): Edisi 1 Januari s/d Juni 2019
Publisher : Jurnal Online Mahasiswa (JOM) Bidang Teknik dan Sains

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Abstract

Mandau Sub-district is one of the regions that has considerable transportation activities in Riau Province. Therefore, the calculation of the total of vehicles is very necessary to find out the total of vehicles that passed through the roads in Mandau Sub-district. This research was conducted to determine the total of motorized vehicles produced during peak hours on Mondays. The method of this study was recording the traffic activity to count the total of motorized vehicles that passed through the road in Mandau Sub-district. The results of this study were the total of motorized vehicles during peak hours on Monday for each road was 9,070 units on Hangtuah Street, 7,581 units on Mawar Street, and 2,442 units on Pertanian Street. This showed the magnitude of transportation activities in Mandau Sub-district. Keyword: Mandau Sub-district, Transportation, and Traffic Counting.
Pengaruh Jumlah Penambahan Graphene Nanosheets (GNSs) Dan Gliserol Terhadap Sifat Mekanis Coating Komposit Berbasis Polyvinyl Alcohol (PVA) Abdul Rasyid Amrin; Amun Amri; Aman Aman
Jurnal Online Mahasiswa (JOM) Bidang Teknik dan Sains Vol 6 (2019): Edisi 1 Januari s/d Juni 2019
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Abstract

Polyvinyl alcohol (PVA) based conductive coatings composite wih the addition of graphene nanosheets (GNSs) have been successfully synthesized. Composites were synthesized using the solution mixing method and were tested their conductive properties, mechanical properties (tensile strength, elongation at break, and young modulus), morphology, and functional group analysis. The results showed that the addition of graphene increased the electrical conductivity, tensile strength, and Young modulus, but decreased elongation at break composite coating. Addition of glycerol increased elongation at break, but decreased the electrical conductivity, tensile strength, and Young modulus. The highest electrical conductivity was 1.11 x 10-3 s/m obtained by adding 3% graphene, the highest tensile strength was 25,894 MPa obtained by adding 3% graphene, the highest elongation was 250.862% obtained by adding 2%wt glycerol, and the highest modulus young was 18,496 MPa obtained by adding 3% graphene. Based on the results of the study, the PVA-based conductive composite coating with the addition of graphene nanosheets has a good perspective to develop further. Keywords: coating composite, glycerol, graphene, PVA
Karakteristik Pengujian Tegangan Tembus Arus Bolak Balik Pada Minyak Kelapa (Cocos Nucifera) Sebagai Alternatif Isolasi Cair Rizal, Ghane Sha; Murdiya, Fri
Jurnal Online Mahasiswa (JOM) Bidang Teknik dan Sains Vol 6 (2019): Edisi 1 Januari s/d Juni 2019
Publisher : Jurnal Online Mahasiswa (JOM) Bidang Teknik dan Sains

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Abstract

This research is looking for the ratio of breakdown voltage between mineral oil and Cocos nucifera oil as an alternative of liquid insulation. The test of oil uses half-spare electrode. The results of the research, the value of oil breakdown voltage Cocos Nucifera after reduced water content is higher than mineral oil. This research also examined varies gap space, water content and varies in temperature rise on Cocos Nucifera oil to determine the effect of breakdown voltage. Less water level in oil is higher value of breakdown voltage. To be used as an alternative to liquid insulation, it must meet several criteria according to the standared spesifications of liquid insulation oil. Cocos Nucifera oil before reducing in water content has refer several requirements including density and viscosity based on standard SPLN 49-1:1982. Cocos nucifera oil after reducing in water content has met several criteria requirements including breakdown voltage, density, and viscosity. While for the specifications of the pour point and flash point not saturate the criteria as an alternative to liquid insulation. Keywords: Liquid insulation,breakdown voltage, cocos nucifera oil.
Disain Dan Simulasi Generator Magnet Permanen 3 Phasa Menggunakan Softwawre Magnet Untuk Pembangkit Listrik Tenaga Angin Kecepatan Rendah Irfan, Joni; Hamzah, Amir
Jurnal Online Mahasiswa (JOM) Bidang Teknik dan Sains Vol 6 (2019): Edisi 1 Januari s/d Juni 2019
Publisher : Jurnal Online Mahasiswa (JOM) Bidang Teknik dan Sains

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Abstract

Indonesia is a country that has abundant energy resources and is built on the trajectory of the equator, so it has the potential to be used as a Wind Power Plant. The permanent magnet synchronous generator (GSMP) is the main component of the wind power generation. The author designs the GSMP using the MagNet Infolityca software. In designing the author publishes a number of journal guidelines and design specifications of products that synchronize permanent magnet generators marketed in the market. In accordance with technological developments and market requirements, in the study the authors agreed to the GSMP with the specifications of 18 12-pole slots with inter-phase voltage output of 41.5 volts AC, and 500 watts of power. This GSMP has a winding factor of 0866, because it uses the single layer lap winding winding method. The inter phase output voltage from the generator simulation is 39.88 V AC, with the effective voltage value is 56.40 V AC. When compared with the calculation obtained the difference (error) of 1.62% for the value of voltage between phase and 1.65% for effective voltage.Keywords: 3 phase Permanent Magnet Synchronous Generator, MagNet Infolytica, Wind power generator, low speed.
Pengaruh Persentase Semen Opc Terhadap Kuat Tekan Mortar Geopolimer Abu Terbang Dengan Perawatan Suhu Ruang Pratama, Rudy Satriya; Kamaldi, Alfian; Olivia, Monita
Jurnal Online Mahasiswa (JOM) Bidang Teknik dan Sains Vol 6 (2019): Edisi 1 Januari s/d Juni 2019
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Abstract

Geopolymers are environmentally friendly materials that utilize inorganic industrial waste rich in silica and alumina such as fly ash which is reacted with alkaline solutions. This study examined the effect of the percentage of Ordinary Portland Cement used as a partial substitute for fly ash against the compressive strength of mortar. The variation in the percentage of OPC used was 5%, 10%, 15%, 20% and 25%. The size of the mortar used was 50 mm × 50 mm × 50 mm. Tests on geopolymer mortar were carried out at 7, 14 and 28 days after the samples were cured under room temperature. The results showed the increase in the use of OPC would increase the compressive strength of geopolymer mortar. The use of OPC with 25% of the fly ash had a compressive strength of 11.2 MPa at 28 days after the samples were cured under room temperature. Furthermore, the compressive strength increased to 180% against the compressive strength of geopolymer mortar with the used 5% OPC. Mortar geopolymers with used of OPC 5%, 10%, 15%, and 20% had compressive strength 4 MPa, 8 MPa, 8 MPa, and 11.2 MPa after the samples were cured under room temperature. The conclusion obtained from this study was that the use of OPC of 25% as a substitute of fly ash in the geopolymer mortar was the optimum percentage which resulted in the maximum compressive strength.Keywords: Mortar, geopolymer, fly ash, compressive strength, OPC cement
Pembuatan Biodiesel Dari Minyak Nyamplung (Calophyllum Inophyllum) Menggunakan Katalis Basa Heterogen Naca-Geopolimer Mustapa Ardi; Zuchra Helwani; Edy Saputra
Jurnal Online Mahasiswa (JOM) Bidang Teknik dan Sains Vol 6 (2019): Edisi 1 Januari s/d Juni 2019
Publisher : Jurnal Online Mahasiswa (JOM) Bidang Teknik dan Sains

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Abstract

Biodiesel is a product of transesterification reaction fat/oil and methanol with the aid of catalyst. Catalysts is commonly used in the production of biodiesel is strong base catalysts such as NaOH and KOH which is difficult to separate from the product of the reaction because it has the same phase as the reactant. Therefore, it is necessary to develop catalyst technology in order to get the production process becomes more economical, applicable and environmentally friendly, one of the catalyst is geopolymer. Geopolymers are synthesized by reacting sodium silicate, metakaolin, and bottom ash. Geopolymers is used in transesterification reaction. The process variables are weight of oil 50 grams, stirring rate 400 rpm, reaction time 120 minutes, and temperature of 65 oC, with catalyst 2% (w/w) and mole ratio of methanol:oil 1:12. The yield of biodiesel 88.04% with density 875 kg/m3, viscosity 4.27 mm2/s, the acid number of 0.29 mg-KOH/g biodiesel, the flash point 140 °C and alkyl ester level of 99,91% comply with the SNI standards (SNI 7182: 2015). Keywords: biodiesel, calophyllum inophyllum oil, geopolymer, transesterification, yield
Pengaruh Komposisi Lumpur Ipal Minyak Sawit Dan Cangkang Biji Karet Serta Tekanan Pengepresan Terhadap Nilai Kuat Tekan Briket Muhammad Fajri Chaniago; Elvi Yenie; Aryo Sasmita
Jurnal Online Mahasiswa (JOM) Bidang Teknik dan Sains Vol 6 (2019): Edisi 1 Januari s/d Juni 2019
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Abstract

WWTP mud (Waste Water Treatment Plant) production of palm oil is the result of sediment from liquid waste containing high organic matter and has not been utilized optimally. WWTP mud produced by palm oil by adding rubber seed shells that can be used as solid fuel in the form of briquettes through a carbonization process with the addition of crude glycerol as an adhesive and can increase the calorific value of the briquettes produced. The adhesive used is crude glycerol because it has high viscosity and density characteristics which can be used as adhesives. In this study the variables used were IPAL sludge ratios for palm oil and rubber seed shell production (90:10, 80:20, 70:30, and 60:40% bb) and pressing pressures (50, 75, and 100 bar) with percentages crude glycerol 40% of the total weight of briquettes. The best compressive strength of 0.1428 kg / cm2 at ratio of 60: 40% with a pressure of 100 bar. The process conditions that have a very significant effect on the compressive strength that significantly influences is ratio of raw materials and pressing pressure which affects the yield. Keywords: Glycerol Crude, Carbonization, Briquette, IPAL Mud (Waste Water Treatment Plant) produced by palm oil, Rubber Seed Shell.
Pembuatan Bioplastik Berbasis Pati Sagu Menggunakan Modifikator Asam Sitrat Dengan Microcrystalline Cellulose (Mcc) Sebagai Filler Dan Sorbitol Sebagai Plasticizer Novriyani, Vivi; Utami, Syelvia Putri; Bahruddin, Bahruddin
Jurnal Online Mahasiswa (JOM) Bidang Teknik dan Sains Vol 6 (2019): Edisi 1 Januari s/d Juni 2019
Publisher : Jurnal Online Mahasiswa (JOM) Bidang Teknik dan Sains

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Abstract

The use of synthetic plastic in daily life trigger environmental problems. Bioplastic or biodegradable plastic is one of alternative solution to change comercial plastic that can be dangerous to environment because it is difficult to be degraded. One of the potential materials to become the raw materials is sago because of its high starch component. The general purpose of this research is to determine the characteristics of sago-based bioplastic by modified the citric acid, microcrystalline cellulose filler, plasticizer sorbitol. The synthesis method is casting of starch, water, filler and plasticizer with composition of filler is (15-25 % b/b), composition of plasticizer (25–35 % b/b), and composition citric acid (3-9 % b/b). The analysis of bioplastic was tensile strength, elongation, biodegradation,. The most significant factor of all responses was composition of filler microcrystalline cellulose, followed by plastcizer sorbitol and citric acid. The best process condition was bioplastic with composition filler 20 %b/b, plasticizer 30 % b/b, and citric acid 0,95 % b/b with the value was tensile strenght 15.84 MPa, elongation 9,31% and biodegradation 51.65%. Keyword : bioplastic, casting, filler, plasticizer, water uptake

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