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Jurnal Online Mahasiswa (JOM) Bidang Teknik dan Sains
Published by Universitas Riau
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Core Subject : Engineering,
Engineering
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Articles 3,145 Documents
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Analisa Proteksi Arus Lebih Gangguan Tanah Pada Feeder Gardu Induk Garuda Sakti Grace Arisantha; Edy Hamdani
Jurnal Online Mahasiswa (JOM) Bidang Teknik dan Sains Vol 4, No 1 (2017): Wisuda Februari Tahun 2017
Publisher : Jurnal Online Mahasiswa (JOM) Bidang Teknik dan Sains

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Abstract

There are a lot of disruption in the distribution of electrical energy which can result in interruption of the power supply to the load. It is necessary for the protection or security system that is reliable to anticipate when an interruption occurs. Protection system serves to separate the problematic parts with which is not for the system to remain operational.Usually 20 KV feeder outages caused by short circuit. Total blackout (black out) can occur when setting the relay or in this study were discussed Ground Fault Relay (GFR) on the incoming or outgoing unfavorable. For that one effort that can be done is to analyze the protection relay settings, so that mutually coordinated well and is expected if an interruption in one of the feeder it will not make black out the other.From the research, the high short-circuit fault current is influenced by the distance of the point of interruption, the greater the distance the point of interruption, the smaller the short circuit fault current and vice versa. Where it is known from the analysis set Ground Fault Relay (GFR) at 20 KV incoming side has a delay of work, so do resetting on the incoming side by setting the delay time becomes 0.28 seconds.Keywords : Ground Fault Relay, short circuit, one phase to ground
Nilai Slump, Porositas Dan Kuat Tekan Beton OPC Dan OPC RHA Untuk Aplikasi Di Lingkungan Gambut Alfadh, Mhd Raja; Kamaldi, Alfian; Olivia, Monita
Jurnal Online Mahasiswa (JOM) Bidang Teknik dan Sains Vol 5, No 1 (2018): Wisuda April Tahun 2018
Publisher : Jurnal Online Mahasiswa (JOM) Bidang Teknik dan Sains

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Abstract

The aggressive environment, especially the peat environment contains many chemicals that can unravel the elements in the concrete, causing damage to the concrete. This study examines the strength and physical properties of OPC (Ordinary Portland Cement) concrete and OPC RHA (Rice Husk Ash) concrete exposed in peat environments. RHA as one of pozzolan with high silica is used as a replacement of cement with the substitution of 5% and 10%. This concrete are tested mechanically and physically such as compressive strength and porosity tests after soaking in peat canals for 28 days, in addition to fresh concrete tests such as workability. The concrete strength of the planned concrete is K-250. The peat water used as a test immersion medium has a pH of 3.5-4.5. The results of fresh concrete testing show that the addition of RHA makes the workability decreases. The lowest workability was obtained from a mix containing 10% RHA. The OPC concrete has the highest compressive strength of 20,28 MPa. Porosity of OPC RHA concrete decreased with increase in curing time. The lowest porosity is shown by OPC RHA 10% concrete. Based on the results of the test, it is concluded that the replacement of cement by RHA, has a positive effect on all physical properties of concrete.Keywords: Peat Environtment, OPC, RHA, Compressive strength, Physical Properties
Aplikasi Shringking Core Model (SCM) Pada Reaksi Deasetilasi Kitin Menjadi Kitosan Mochamad Reizal Ath Thariq; Ahmad Fadli; Amun Amri
Jurnal Online Mahasiswa (JOM) Bidang Teknik dan Sains Vol 4, No 2 (2017): Wisuda Oktober Tahun 2017
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Abstract

Chitosan is derived from chitin compound used in the biomedical field. Chitosan can be synthesized from ebi waste.Chitosan can be produced by chemichal methods through the deproteinasi process, the demineralization process and the deacetylation process.in this research, Ebi powder was reacting with NaOH 3.5% (deproteinasi), ratio 1:10 (w/v) for 2 hours stirring by 150 rpm. The product reacted with HCl 1 N (demineralization), ratio 1:15 (w/v) for 1 hour stirring by 150 rpm. Then product was reacting using NaOH 50% (deacetylation), ratio 1:20 (w/v) at a temperature of 100oC, 110oC and 120oC with stirring by 150 rpm for 2 hours. Samples were taken every 10 minutes rise as much as 10 mL, washed until pH neutral and dried. Deacetylation degree of chitosan analyzed using acid-base titration method. The highest degree of deacetylation of the chitosan will be 71.68% to 80.28% at a temperature of 100-120oC. The best reaction kinetics model to describe the occur in the synthesis of chitosan is a model of ash layer (chitosan) to control.Keywords: deacetylation, reaction kinetics, chitosan, waste ebi, shrinking, core model.
Optimasi Daerah Irigasi Muara Jalai Kecamatan Kampar Utara Kabupaten Kampar Provinsi Riau Hafid Muhaimin Hasward; Manyuk Fauzi; Siswanto Siswanto
Jurnal Online Mahasiswa (JOM) Bidang Teknik dan Sains Vol 4, No 1 (2017): Wisuda Februari Tahun 2017
Publisher : Jurnal Online Mahasiswa (JOM) Bidang Teknik dan Sains

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Abstract

Rice field area in Riau Province in the last 10 years experienced a rate decrease each year from 2004 to 2013 amounted to 7.23%. For irrigated areas Muara Jalai occurrence over the land like a wetland conversion to oil palm and mining quary that reduce water catchment areas. In previous studies the overall use of water in irrigated areas Muara Jalai otherwise not optimal, which is not optimal rate is 47.3% (<50%) by using analysis of analytical hierarchy process (AHP). For this study focused on a review of optimization in irrigated areas Muara Jalai in order to obtain optimal results related to water availability. The method used in this study as a method mock and modified Penman method. While the application used in this study CropWat, ArcGIS, Auto Cad, and Microsoft Excel. The results of climatological data input using the application CropWat gained 3.38 mm/day. Irrigation Area watershed area in Muara Jalai of the measurement results obtained 392.609 Ha. To discharge the mainstay calculate using methods Mock gained 0.06 m3/ sec. In this study used a variation cropping paddy-rice-pulses and rice-crops-crops at planting time in August, September. The research result shows that the most optimal to meet the criteria for each period is the cropping pattern of rice-paddy-planting crops with September.Keywords: Optimization of irrigation Muara Jalai using Mock.
Analisa Effectiveness Mesin Threser Di PTPN V Sei Garo Menggunakan Metode Analytical Hierarchy Process (AHP) Aria, Dedek; Susilawati, Anita
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

This research is aimed to analyze production process at threser station using Overall Equipment Effectiveness (OEE) and AHP methods in PTPN V Sei.Garo factory. The research methodology consists of three main steps: (1) gathered data, (2) calculate the OEE values to analyze the losses, (3) evaluated the big losses using the AHP method. The calculation of the OEE values based on the 6 months data period, from March to August 2017. There were six big losses analysed in this research i.e.: breakdown losses, setup and adjustment losses, idling and minor stoppage losses, reduced speed losses, rework losses and reduced yield losses. A loss analysis can be indicated in low OEE values result. From the analysis of OEE calculation results were obtained the OEE values rate of the threser machine during research period of 74.11%. It was below the world class standard (below 85%). Result of the analysis of six big losses was obtained the significant losses affect the OEE value of idle minor losses. The high idle and minor losses of the threser machine should be removed by determine action to minimize the causes of losses. Furthermore, it was chose the alternative action to overcome the highest losses using Analytical Hierarchy Process (AHP) method. The result shown alternative weighted data to reduced the idle and minor losses priority of periodically checking (0.29), SOP application (0.28), retraining (0.27), and maintain cleanliness (0.15). Therefore, to reduced the losses and improve the effectiveness of threser station can be implemented Total Productive Maintenance (TPM) pillars such as focused maintenance (periodically check the machine components) and autonomous maintenance.Keywords: OEE, Threser machine, Analytical Hierarchy Process
Sintesis Hidroksiapatit Dari Precipitated Calcium Carbonate (PCC) Cangkang Telur Ayam Ras melalui Proses Presipitasi Agustiyanti, Rini Dwi; Azis, Yelmida; Helwani, Zuchra
Jurnal Online Mahasiswa (JOM) Bidang Teknik dan Sains Vol 5, No 1 (2018): Wisuda April Tahun 2018
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Abstract

Hydroxyapatite is high biactive dan bioafinity ceramic materials. Hydroxyapatite also known osteoconductive, non-toxic, and non-immunogeic. So that there are many application ofhydroxyapatite such as catalyst, fertilizer industry and pharmacy product, protein cromatography application, water treatment, bone and teeth repair. In this research, hydroxyapatite synthesised from PCC of chicken’s egg shell by using precipitation methodwith variation of pH (9, 10, and 11) and stirring speed (200, 250, and 300 rpm). Hydroxyapatite that acquired has been analyze by using FTIR, XRD, SEM-EDX, dan BET. From FTIR analysis best hydroxyapatite acquired by synthesis using pH 11 for stirring speed200 rpm, pH 9 for stirring speed 250 rpm, and pH 11 for stirring speed 300 rpm. From XRD analysis acquired hydroxyapatite with best crystalinity if it comparred with standardhydroxyapatite and smallest crystal size in pH 11 and stirring speed 300 rpm that is 23,07 nm. From SEM-EDX analysis known that acquired hydroxyapatite from synthesis in pH 11and stirring speed 300 rpm has agglomarate shape with particle size 62,5 nm and molar ratio 1,41. The result of BET analysis show that total surface area of hyroxyapatite was 28,406m2/gKeywords: agglomerate, hydroxyapatite, bioctive, stirring, pH, precipitation
Porositas Dan Sorptivity Beton OPC Dan Beton OPC POFA Dengan Perbaikan Air Gambut Sebagai Air Pencampur Menggunakan Kapur Tohor Di Lingkungan Gambut Sormin, Lina S; Olivia, Monita; Syaputra, Edy
Jurnal Online Mahasiswa (JOM) Bidang Teknik dan Sains Vol 4, No 2 (2017): Wisuda Oktober Tahun 2017
Publisher : Jurnal Online Mahasiswa (JOM) Bidang Teknik dan Sains

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Abstract

The use of peat water is often used as concrete mixing water in areas difficult to obtain clean water. Peat water containing a low pH is not recommended as concrete mixing water because it can reduce the quality of concrete. Mineral materials such as Palm Oil Fuel Ash (POFA) used in the concrete mix to increase the density of the resulting. This study aims to assess the physical properties such as porosity and water sorptivity concrete using peat as concrete mixing water. Type of cement used in the concrete mixture is OPC and OPC POFA 10%. Peat water for the research came from Rimbo Panjang, Kampar, Riau and POFA derived from Perhentian Raja, Kampar, Riau. Research results show that concrete repair using quicklime 40 milligrams for peat water soaked peat environment has a high porosity and sorptivity.Keywords: OPC, Palm Oil Fuel Ash (POFA), peat water, quicklime
Preparasi Katalis CaO/Fly Ash Dan Penggunaannya Pada Reaksi Transesterifikasi Minyak Sawit Off-Grade Menjadi Biodiesel Robi Maulana; Zuchra Helwani; Edy Saputra
Jurnal Online Mahasiswa (JOM) Bidang Teknik dan Sains Vol 4, No 1 (2017): Wisuda Februari Tahun 2017
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Abstract

A palm fly ash supported calcium oxide (CaO) catalyst was prepared and used in transesterification from off-grade palm oil for biodiesel production. The catalyst synthesized by loading CaO of calcium nitrate tetrahydrate (Ca(NO3)2.4H2O) into fly ash through impregnation method. The optimum catalyst preparation conditions were determined by influence of calcination temperature and weight ratio of Ca(NO3)2.4H2O and fly ash. Catalyst with highest catalytic activity was achieved when calcined at 800 oC and proportion of Ca(NO3)2.4H2O to fly ash is 80:20. Under the conditions of oil : methanol ratio of 1:6, catalyst dosage of 6 wt% and temperature of 70 oC for 2 h, the biodiesel yield reaches to 71,77%. CaO, SiO2, Ca(OH)2 and Ca2SiO4 were found in the catalyst through X-ray diffraction (XRD) while the basic strength of the catalyst H_ > 9,3 was determined by using Hammett indicator phenolphthalein. Surface area of the developed catalyst is 24,342 m2/g through Brunauer-Emmett-Teller (BET). Characteristics of biodiesel such as density, kinematic viscosity, acid value, flash point has been matched with standard for biodiesel specification of Indonesia.Keywords: calcium oxyde, catalyst, fly ash, biodiesel, off-grade palm oil, impregnation,calcination, transesterification.
Analisis Perkuatan Cerucuk Kayu Bakau Dan Kayu Mahang Terhadap Peningkatan Daya Dukung Tanah Gambut Saputra, Adetia; Muhardi, Muhardi; Fatnanta, Ferry
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

Riau province has a very large peatland. Large peatland is constraint in the development of infrastructure of a region. The problems posed ini the field of contruction is the amount of land degradation and low soil carrying capacity. Therefore, an alternative to the soil reinforcement is required by using the cerucuk timber to increase the carrying capacity of the foundation and soil reinforcement. This research was conducted to determine the carrying capacity of mangrove and mahogany wood as reinforcement on peat soil with laboratory scale modeling. The research was done by applying load tests on those timbers in a testing basin with dimensions of 1,2 m x 1 m x 1 m with variations of single pile, group pile consists of 4 piles, and group pile consists of 9 piles. The used method was alpha method as the reference to determine limit bearing capacity. From the test result of settlement interpretation loading of 25 mm on mangrove, it was obtained that maximum bearing capacity were 16,22 kg and 19,85 kg when the pile was embedded for 1 day and 7 days long. As for the mahang, the maximum bearing capacity were 15,51 kg and 18,47 kg when the pile was embedded for 1 day and 7 days long. According to the results, it could be concluded that mangrove piles had a larger bearing capacity compared to mahang piles.Keywords : mangrove piles, mahang piles, foundation`s bearing capacity, peat.
Analisa Jaringan Pipa Distribusi Air Bersih Kecamatan Kerinci Kanan (Studi Kasus: Kecamtan Kerinci Kanan, Kabupaten Siak) Pandu Hudiiasto; Siswanto Siswanto; Trimaijon Trimaijon
Jurnal Online Mahasiswa (JOM) Bidang Teknik dan Sains Vol 4, No 2 (2017): Wisuda Oktober Tahun 2017
Publisher : Jurnal Online Mahasiswa (JOM) Bidang Teknik dan Sains

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Abstract

The area to be reviewed in this writing is a district located in Riau Province, namely Kerinci Kanan District. Kerinci area Right water is difficult due to its location far from the water source and the soil is not safe to be drilled. Previous drilling efforts have been made for the wellbore, but from inside the soil emit a kind of gas odor so that drilling is stopped. The Local Government has built a Water Treatment Plant (WTP) located in Lubuk Dalam District to meet the needs of clean water in Lubuk Dalam District and Kerinci Kanan District. For water sources taken from Buatan River. Distribution pipes are still in progress and need testing in software or lab tests. This test aims to ensure that the water discharged can meet the needs of the community as planned.Keywords: EPANET 2.0, distribution pipes, clean water.

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