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Jurnal Online Mahasiswa (JOM) Bidang Teknik dan Sains
Published by Universitas Riau
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Articles 3,145 Documents
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Karakteristik Pengujian Tegangan Tembus Isolasi Gas Nitrogen Dan Karbon Dioksida Menggunakan Tegangan Tembus Dc Polaritas Negatif Chandra, Andre; Murdiya, Fri
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 focus on the comparison of breakdown voltage between CO2 and N2. In this experiment, the condition of gas pressures were at 1 bar, 2 bar, 3 bar and 4 bar respectively. Configuration of the choosen electrodes were needles and spheres electrodes. Breakdown voltage value for both gases were proportional with gas pressure. It showns that the breakdown voltage of N2 is higher than CO2 on the gas pressure condition 4 bar and gap of needles electrodes 1 cm. The same thing is shown by condition on the gap of spheres electrodes 1 cm and gas pressure 4 bar, whereas breakdown voltage of N2 is also higher than CO2. The breakdown voltages value for the gap of spheres electrodes 1 cm and gas pressure 4 bar reaches the highest value at 137.07 kV/cm and 121.49 kV/cm for N2 and CO2 respectively. This research also varies gas pressure and gap between electrodes. It showns that the breakdown voltage of N2 is also higher than CO2 for all conditions.Keywords— DC Negative Polarity, Electrodes, Isolator, CO2, N2, Breakdown Voltage
Sintesis Hidroksiapatit Dari Precipitated Calcium Carbonate (PCC) Cangkang Telur Itik Melalui Proses Sol-Gel Dengan Variasi Rasio Reaktan Ca/P Dan Waktu Aging Luckita, Gema Kesa; Azis, Yelmida; Akbar, Fajril
Jurnal Online Mahasiswa (JOM) Bidang Teknik dan Sains Vol 5 (2018): Edisi 2 Juli s/d Desember 2018
Publisher : Jurnal Online Mahasiswa (JOM) Bidang Teknik dan Sains

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Abstract

Precipitated Calcium Carbonate (PCC) is a product of nature material that contain calcium carbonate, like duck eggshell. PCC producted by precipitation process with high purity. Hydroxyapatite (HAp) is a crystalline molecule composed of phosphorus and calcium with molecular formula is Ca10(PO4)6(OH)2. Hydroxyapatite is a bioceramic which is widely used as bone graft or teeth, catalyst, and adsorbent. This research aims to study the effect of reactant ratio of Ca/P and aging time on synthesized HAp and to find the best condition of reactant ratio of Ca/P and aging time of hydroxyapatite synthesis in this method. In this research, hydroxyapatite was done by sol-gel method through from PCC formation path from duck egg shell which has 99.6% content. The variations given in this research are the reactant ratio of Ca/P (1.67 and 1.77) and aging time ( 16, 20, 24, 28, and 32 hours). The synthesized hydroxyapatite was analyzed by Fourier Transform Infrared Spectroscopy (FTIR), X-Ray Diffraction (XRD), Scanning Electron Microscopy – Energy Dispersive X-Ray (SEM-EDX). The result showed that the reactant ratio of Ca/P and aging time has effects on the synthesized hydroxyapatite characteristics. The result of FTIR analysis shows that in each sample there are groups of PO43-, OH-, and CO3- which indicate that apatite compound has been formed. The XRD analysis results show that the synthesized hydroxyapatite has X-Ray pattern and the highest intensity peak at angle of 2θ which is very similar to the standard hydroxyapatite from ICDD data (International Centre of Diffraction Data). The optimum condition of reactant ratio of Ca/P and aging time was obtained at the reactant ratio of Ca/P 1.67 and aging time during 32 hours due to the X-Ray pattern and the highest intensity peak at angle of 2θ very similar to the standard hydroxyapatite and having the smallest diameter than other conditions which is 26.8909 nm. The result of SEM-EDX analysis show the hydroxyapatite morphology in the form of agglomerate with molar ratio of Ca/P 1.57 .Keywords : aging, hydroxyapatite, sol-gel method, PCC, synthesis.
Pembuatan Sistem Akuisisi Data Sederhana Menggunakan Arduino-Python (Studi Kasus: Suhu Fluida Pada Tangki Pemanas) Dita Nurhalimah; Muhammad Iwan Fermi; Zulfansyah Zulfansyah
Jurnal Online Mahasiswa (JOM) Bidang Teknik dan Sains Vol 6 (2019): Edisi 2 Juli s/d Desember 2019
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Data acquisition (DAQ) is a part of control system and almost applied in all aspects, in industrial automation processes. The main objective of this research is to construct the DAQ using Arduino Python-based in developing a graphical user interface (GUI). The system consists of two components, i.e. hardware and software, which are designed on client-runtime module. PyQt5 was chosen as the basis for developing the GUI. The DAQ system testing is carried out on a stirred heating tank with the observations of fluid temperatures and actuation element is electric heaters. The GUI allows users to be able to visualize and store data in real time mode. The performance of the system is verified based on manual observation. It was found that the system could be carried out for interactive manual control. Even so, the created system can be used for data collection process in the process control laboratory in Chemical Engineering Department of Riau University. In the future, it is expected that the performance of the system can be improved.Keywords: data acquisition, control, Arduino, Python, GUI
Rancang Bangun Jaringan Komputer Local Area Network Pada PT.Mars Material Mitraindo Jesslin Halim; Noveri Lysbetti Marpaung
Jurnal Online Mahasiswa (JOM) Bidang Teknik dan Sains Vol 6 (2019): Edisi 2 Juli s/d Desember 2019
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At present, PT.Mars Material Mitraindo only uses 2 computers to operate. This makes PT.Mars Material Mitraindo employees have to take turns in using a computer to input financial data. This queue makes employee performance inefficient in terms of time. So PT.Mars Material Mitraindo plans to add 14 units of computers to streamline employee performance. The method used in this research is to analyze in making simulations and designing systems. The first step taken in this study is to analyse of the placement of each computer unit then makes a simulation of it to packet tracer. The second step is to test each computer unit to make sure each computer is connected to each other. The results achieved in this study are an increase in data efficiency by 79.5978% and time efficiency by 78.1835% of the amount of data downloaded by the type of document data. Key words: internet, LAN, data exchange
Optimasi Proses Pembuatan Arang Batang Sawit Melalui Proses Karbonisasi Menggunakan Response Surface Methodology Mia Afriyenti; Zuchra Helwani; Warman Fatra
Jurnal Online Mahasiswa (JOM) Bidang Teknik dan Sains Vol 5, No 1 (2018): Wisuda April Tahun 2018
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Palm oil trunk until this date is a waste which still not been used maximally, so palm oil trunk have potential to be used as alternative energy resource of solid fuel with the way of increasing its calorific value through carbonization process. Carbonization is converting process of biomass to become charcoal at temperature range 300-600 oC in inert condition. The objective of this research is to study the characteristics of resulted solid fuels. Palm oil carbonization used tube furnace as reactor within operating conditions of temperature (350, 400 and 450 oC), residence time (90, 120 and 150 minutes) and feed size (2, 4 and 6 cm). The analized responses were calorific value and volatile matter content. Obtained result for calorific value amounts 24,426.300-28,929.100 kJ/kg and volatile matter content amounts 8-19 %. The obtained analysis is processed using Design Expert v7.0.0 Trial Version. Processing data begins with using first order to see the degree of curvature. Degree of curvature obtained indicate the model to use is second order. Level of significance between variables can be observed from the value of P-value < 0,05 and lack of fit > 0,05, which indicate that model is suitable with the obtained data. R2 obtained for Y1 = 0.9486 and Y2 = 0.9704. The most influential factors to all responses are carbonization temperature followed with residence time and feed size. At optimum operating conditions (temperature 449,99 °C during 149,96 minutes with feed size 2 cm), the value of optimum responses obtained are Y1= 28.282,2 kJ/kg and Y2 = 9,234 %.Keywords : biomass, carbonization, optimization, palm oil trunk, rsm, solid fuel
Rancang Bangun Alat Ukur Kualitas Oli Kendaraan Dengan Mengukur Perubahan Viskositas Berbasis Internet Of Things (IOT) Riki Desrianto; Linna Oktaviana Sari; Ery Safrianti
Jurnal Online Mahasiswa (JOM) Bidang Teknik dan Sains Vol 6 (2019): Edisi 2 Juli s/d Desember 2019
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In the field of machinery, both private-owned transportation or company- engaged in transportation, such as two-wheeled and four-wheeled vehicles. lubricant quality measurement is important in keeping the engine be durable and long-lasting, timely lubricant changing can save the maintenance cost and also provide driving comfortable, on the other hand, lubricant changes that is not on time can cause the engine be break quickly and lavish in maintenance costs, lubricant quality can be identified by measuring the changing of viscosity. In this study lubricants quality measurement tool is designed by measuring changes of viscosity based on Internet of Things, by knowing the changes of viscosity can determine the condition of each lubricant, by applying the internet of things technology on measurements can make monitoring be easier because measurement data are sent and stored in the database, by android application in monitor of the measurements using internet network whenever and wherever, from testing results using method, conducted on three different lubricants samples obtained that correlation relationship between voltage and viscosity with linear line equation namely: SAE 10W-30 lubricants are y = 6.4896x + 74,076, SAE 20W-40 oil are y = 9.11x + 154.61 and SAE 15W-30 lubricants are y = 16.013x + 129.8 where as x is the voltage and y is the viscosity the average error of each tool measurement is of lubricant quite good only 2.61%. Sending measurement data by arduino devices is also very good with an average delay less than 300ms.Keywords: Lubricants, Viscosity, Internet of Things.
PENGOLAHAN LIMBAH CAIR SAWIT DENGAN METODE AOP (ADVANCED OXIDATION PROCESS) MENGGUNAKAN KATALIS LAMNO3 PEROVSKITE DENGAN VARIASI OKSIDAN PEROXYMONOSULFATE Hasrul, Hasrul; Saputra, Edy; Khairat, Khairat
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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Processing of palm oil into Crude Palm Oil (CPO) will produce a large amount of liquid waste. To produce a ton of crude palm oil (CPO) produced 6 m3 of palm oil mill effluent. In this study, a process for removing organic compounds in wastewater using the advanced oxidation process by combining peroxymonosulfate (2KHS5.KHSO4.K2SO4) and a catalyst of LaMnO3 Perovskite. The combination will produce sulfate free radicals that capable degrading harmful organic compounds in effluent effectively. Nanocrystalline LaMnO3 was obtained by calcination at a temperature of 800 °C for 2 hours with an average crystal diameter of the highest peak of 17 ?m in the shape of the Rhombohedral catalyst and the catalyst has qualified the catalyst with a nanoparticle structure. Several variations of oxidation process variables were performed to assess their effect on organic matter decline. Some fixed variables were oxidation reaction temperature 30 oC, reaction time 120 min, stirring speed 400 rpm, and concentration of peroxymonosulfate solution 2 g/L and catalyst concentration 0,4 g / L. Conclution of this research is efficiency of 63.54 % for decreasing COD and efficiency by 27,4% for TOC reduction. This proved that the LaMnO3 catalyst is capable of activating peroxymonosulfate.Keywords : AOP, LaMnO3 Perovskite, Oxidation, Peroxymonosulfate
ANALISA STRUKTUR ALIRAN PADA TURBIN AIR UNDERSHOT TIPE SUDU DATAR UNTUK ALIRAN PADA SUNGAI KECIL Febrizal, Febrizal; Asral, Asral
Jurnal Online Mahasiswa (JOM) Bidang Teknik dan Sains Vol 5 (2018): Edisi 2 Juli s/d Desember 2018
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This research was taken cause lack of potential energy use on water turbine with low head. In this research is done flow structure analysis on undershot water turbine flat blade type with variations of water level refers to the results that have been done. This research has purpose to obtain flow structure such as pressure distribution and water velocity vector around the water turbine blades. In the modeling of geometry design Autodesk Inventor 2016 was used and simulated by ANSYS 15.0. The design on this research was variaties with 4 designs that will compared and analysed demanding on immersed blade depth in water fluid flow. From the result of simulation the difference of water level shown flow structure different, which are the maximum pressure distribution and water velocity vector is at first condition (H = 880 mm) and the maximum blade force hit by water cause of potential energy is at (H = 880 mm) respectively 48.1 Pa (Static Pressure), 57.0 Pa (Total Pressure), 0.3479 m/s (Velocity Magnitude), 1.28 N (Blade 1), 11.47 N (Blade 2) and 18.42 N (Blade 3).Keywords: Low-Head, Immersed Blade Depth, Pressure Distribution, Velocity Vector, ANSYS Simulation.
PENGARUH PENAMBAHAN LIMBAH BOTOL PLASTIK TERHADAP KARAKTERISTIK MARSHALL PADA BETON ASPAL LAPIS PENGIKAT Puspitasari, Tasia Rizky; Wibisono, Gunawan; Malik, Alfian
Jurnal Online Mahasiswa (JOM) Bidang Teknik dan Sains Vol 5 (2018): Edisi 2 Juli s/d Desember 2018
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Plastics have been used for many consumer goods. Polyethylene Terephthalate (PET) is commonly used as non-reusable water bottles. Although the plastic can be recycled and has economic values, the unhandled waste still threatens the environment. PET based waste products have been used as pavement materials in limited applications. This research attempts to investigate the effect of PET waste addition on binder course asphalt concrete (AC-BC) mixtures. The proportion of PET waste added into bitumen was 0, 2, 4, and 6% of bitumen content. Bina Marga 2010 Specification was used to obtain optimum asphalt content and to measure all Marshall characteristic of all samples tested. The results show that the addition of PET waste increased the stability and flow values of mixtures. The optimum PET waste content that still meets the specification was 4% of bitumen content.Keywords : plastic waste, marshall characteristic, AC-BC.
Menganalisis Hubungan Pakan Ikan Hasil Biodegradasi Styrofoam Oleh Ulat Hongkong Terhadap Nilai LD50 Dengan Variasi Komposisi Bahan Pakan Ikan Zahra Nadia Elysahaq; Elvi Yenie; Sri Rezeki Muria
Jurnal Online Mahasiswa (JOM) Bidang Teknik dan Sains Vol 6 (2019): Edisi 2 Juli s/d Desember 2019
Publisher : Jurnal Online Mahasiswa (JOM) Bidang Teknik dan Sains

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Styrofoam is the number 6 plastic in the plastic classification, namely polystyren and styrofoam is categorized as the 5th largest producer of hazardous waste in the world. One method of processing styrofoam waste is biodegradation using mealworm (Tenebrio molitor larvae) because it is able to degrade styrofoam and does not have a negative impact on survival. The research aims to analyze the relationship of pellet from the biodegradation of styrofoam by mealworm to LD50 values with variations in the composition of pellet making. This research was carried out by the experimental method. The results of the biodegradation of styrofoam produce waste are fecula (mealworm feces) and biomass (dead mealworms). Variations in the composition ratio of ingredients in the pellets of each basin are different. Treatment of A = pellets P1 (25% biomass and 75% fecula), B = P2 pellets (50% biomass and 50% fecula), C = P2 pellets (75% biomass and 25% fecula), and D = pellets commercial buoyancy as a control. The results of the LD50 toxicity test on parrot fish, pellet from the biodegradation of styrofoam by mealworm is not toxic.Keywords: styrofoam waste, biodegradation, mealworm, pellet, LD50 toxicity test.

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