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INDONESIA
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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Aplikasi Pemrograman Metode Elemen Hingga Pada Strukurbeam 2D Menggunakan Program C# Rahman, Soleh; Afrizal, Efi; Nazaruddin, Nazaruddin
Jurnal Online Mahasiswa (JOM) Bidang Teknik dan Sains Vol 8 (2021): Edisi 1 Januari s/d Juni 2021
Publisher : Jurnal Online Mahasiswa (JOM) Bidang Teknik dan Sains

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Abstract

The application of structural analysis is increasingly having a very important role in its existence in today's engineering world. Nowadays there are so many applications that make problem analysis easier, especially in the field of mechanical engineering such as SOLIDWORKS, ANSYS, ABAQUS, INVENTOR and so on. However, these commercial applications are not only quite expensive but also have very strict licensing rules. Of course this raises a kind of concern for users of the application, especially mechanical engineering students at the University of Riau. These problems and reasons are what encourage the author's initiative and ideas to create a structural analysis application that can be used as an alternative for analyzing structural problems. There is no structural analysis application developed previously in the Department of Mechanical Engineering at the University of Riau, so as an initial stage, one of the analyzes that can be developed is a two-dimensional (2D) beam structure analysis that is subject to loading and is in an elastic state using triangular elements. or Constant Strain Element (CST). The development of the application program is based on the Finite Element Method (FEM). From the results of the research that has been done, it can be concluded that the results of calculations in the application that have been developed show the results of the close value after comparisons with the results of calculations on the popular commercial application, namely Abaqus.Keywords: Finite Element Method, structural analysis application, triangular element.
Penyisihan BOD5, COD Dan TSS Limbah Cair Pulp Dan Kertas Dengan Proses Koagulasi-Flokulasi Dan Membran Nanofiltrasi Hendriadi Siregar; Jhon Armedi Pinem; Idral Amri
Jurnal Online Mahasiswa (JOM) Bidang Teknik dan Sains Vol 7 (2020): Edisi 2 Juli s/d Desember 2020
Publisher : Jurnal Online Mahasiswa (JOM) Bidang Teknik dan Sains

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Abstract

Membrane technology began to be developed at this time. The low energy needed in the operation of membrane technology is one of the triggers for this technology to develope. Stages of the process carried out is the process of coaguulation-flocculation to reduce membrane work and nanofiltration processes with operating pressures of 3, 6, and 9 bars. The results obtained are the highest percentage of rejection NF membrane process obtained at a pressure of 9 bar that is equal to 76,30% BOD5; 90,54% COD; and 90% TSS with an average flux value of 19,49 L/m2.hour. Membrane-based processes with pressure thrust such as microfiltration, ultrafiltration, nanofiltration, and reserve osmosis have been widely used in water and wastewater treatment processes. The wastewater used in this study came from one of the pulp and paper industries. Keywords: Pulp and paper wastewater, nanofiltration, Coagulation, Flocculation, rejection
Pengaruh Dosis Biokoagulan Ekstrak Belimbing Wuluh (Averrhoa Bilimbi) Dan Kecepatan Pengadukan Terhadap Penyisihan Zat Organik Dan Warna Pada Air Gambut Febriana, Hertina; Daud, Syarfi; Darmayanti, Lita
Jurnal Online Mahasiswa (JOM) Bidang Teknik dan Sains Vol 8 (2021): Edisi 1 Januari s/d Juni 2021
Publisher : Jurnal Online Mahasiswa (JOM) Bidang Teknik dan Sains

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Abstract

Peat water qualitatively still has constraints such as organic matter and high color, but the use of quantitative peat water has the potential to be processed into clean water. The aim of this study was to study the effect of variations in the dosage of starfruit extract and the speed of stirring on the removal of organic substances and the color of peat water by coagulation and flocculation using the starfruit extract of biokoagulant. This research was carried out with variations in the dosage of starfruit extract of 45 mL, 50 mL, 55 mL, 60 mL  and the stirring speed variations of 100 rpm, 125 rpm, 150 rpm respectively. The results showed the highest removal efficiency of organic matter and color occurred at a dose of coagulant 60 mL / L with a stirring speed of 150 rpm each of 82.23% and 47.22%.   Keywords: Peat Water, Dosage, Stirring Speed, Coagulation-Flocculation, Natural Coagulant
Produksi Lipid Dari Mikroalga Yang Tumbuh Di Air Gambut Dengan Penambahan Nutrisi BG-11 Putri, Bella Nadiah; Elystia, Shinta; Muria, Sri Rezeki
Jurnal Online Mahasiswa (JOM) Bidang Teknik dan Sains Vol 7 (2020): Edisi 1 Januari s/d Juni 2020
Publisher : Jurnal Online Mahasiswa (JOM) Bidang Teknik dan Sains

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Abstract

One innovation in making biodiesel is from microalgae. The use of microalgae as a source of raw materials for biodiesel production requires biomass and high lipid content. The lipid content of microalgae can be converted into biodiesel. The purpose of this study is to look at the effect of the addition of micronutrients on the growth rate and lipid content of indigenous microalgae in peat water. Indigen microalgae as much as 50 mL were cultivated in 450 mL of peat water and BG-11 nutrients at a dose (0 mL / L, 0.5 mL / L, 1 mL / L and 1.5 mL / L) lasted 13 days. The results of the study, the highest cell count of 10.08 x 106 cells / mL and the highest lipid content of 34.8% in the addition of BG-11 nutrients by 1 mL / L. Keywords: Nutrition BG-11, Peat Water, Microalgae Indigeneous, Lipids
Pengaruh Jarak Antar Fondasi Dan Kekasaran Terhadap Daya Dukung Fondasi Tiang Kelompok Sayoga, Davin; Fatnanta, Ferry; Nugroho, Soewignjo Agus
Jurnal Online Mahasiswa (JOM) Bidang Teknik dan Sains Vol 7 (2020): Edisi 2 Juli s/d Desember 2020
Publisher : Jurnal Online Mahasiswa (JOM) Bidang Teknik dan Sains

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Abstract

Upper soil crust of coastal area in Indonesia consists of greatly-thick soft soil. Therefore, the use of end-bearing type pile foundation on that kind of area is highly discouraged due to how expensive it is economically. Friction pile becomes an alternative foundation for coastal area, however there is still little friction between pile surface and soil due to concrete and steel’s smooth surface. Pile modification via improving pile surface’s coarseness can be considered as an alternative for improving friction force between pile and soil. This study aims to determine the effect of pile surface coarseness towards pile surface’s bearing capacity. This study was conducted by making a varying type of coarseness of the pile surface and distance between piles. The first type of coarseness is matched with pile with concrete ingredient. The second type of coarseness is made with stone shards which cover the pile surface in its entirety. The third type of coarseness is a variance of how the first and second coarseness are made, however with same length between segments. The observation was conducted in a laboratory and with loading test applied on the pile model. The test results were analyzed with graphic method. The resulting study shows that there is an improvement in bearing capacity. Foundation with coarseness on its surface has higher Qult value (98,03% - 134,63%) than those without coarseness. Keywords : Soft Soil, Pile Foundation, Coarseness, Static Loading Test, Interpretation of Loading Test
Analisis Pengurangan Efek Transien Terhadap Penggunaan Switching Kapasitor Bank Pada Saluran Transmisi 150 KV Apriyal, Derry; Zakri, Azriyenni Azhari; Feranita, Feranita
Jurnal Online Mahasiswa (JOM) Bidang Teknik dan Sains Vol 8 (2021): Edisi 2 Juli s/d Desember 2021
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Abstract

The use of bank capacitors in an effort to increase the power factor in power quality issues, has several problems to be aware of. Switching capacitor banks during energization can cause transient surges related to transient voltages and currents. This study discusses the simulation and analysis of more transient voltage due to the switching of bank capacitors that occur in riau transmission line 150 kV using MATLAB Simulink 8.7. The effect of transient state when switching capacitor banks can have a detrimental impact, both for equipment and the system as a whole. Use Synchronous Closing Breaker as one solution to solve this problem. By using Synchronous Closing Breaker can reduce the voltage more in the transient state and dampen the oscillations that occur. The result of simulating the transient voltage value produced on Garuda Sakti bus reaches 1.35 pu, and the use of synchronous closing breaker method can reduce the transient voltage up to 1.04 pu. To reduce transient oscillations, it can also reduce transient current from a value of 532.2 A can be reduced to 476.1 A. The percentage of transient voltage reduction of synchronous closing breaker usage is 22.96%.Keywords: Electric Power System, Transient, synchronous closing breaker, Matlab R2016a/Simulink.
Sistem Pendukung Keputusan Untuk Pendistribusian Beras Masyarakat Miskin Menggunakan Logika Fuzzy Sugeno Febiola, Dwi Suci; Candra, Feri
Jurnal Online Mahasiswa (JOM) Bidang Teknik dan Sains Vol 7 (2020): Edisi 2 Juli s/d Desember 2020
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Abstract

Poor people’s rice program or commonly known as Raskin is one of the government’s effort to reduce the burden of spending on the poor and as a social protection. To prevent mistakes in determining Raskin recipients and to avoid cheating by certain parties a system is needed. Decision support systems can overcome this problem, the system can support decision making Raskin recipients based on the criteria specified, so that the calculation is more accurate then the fuzzy logic implementation is used in decision making. The use of fuzzy logic in this system is based on the advantages of fuzzy logic, namely fuzzy logic tolerates incorrect data, fuzzy logic can model functions that are not linear, and fuzzy logic is based on natural language that is easy to understand. The fuzzy logic method used in this study is the Mamdani Method and Sugeno Method, which of the two methods will be compared to the best method by calculating the accuracy and error rate of the two methods. Keywords: Raskin, Decision support systems, Fuzzy logic, Recipient
Analisis Kadar Abu Terhadap Kualitas Karbon Aktif Dari Kayu Pohon Karet Situmeang, David Prinata; Sasmita, Aryo; HS, Edward
Jurnal Online Mahasiswa (JOM) Bidang Teknik dan Sains Vol 8 (2021): Edisi 1 Januari s/d Juni 2021
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Abstract

Activated carbon materials with highly developed surface area are widely use dinnumerous fields, such as the separation and purification of liquids and gases in many areas of human and industrial applications, protection from toxic substances, solvent recovery and decolorizing, catalyst support, supercapacitors, electrodes, gas storage processes and biomedical engineering. This study aims to utilize rubberwood as raw material for making activated carbon. Activated carbon was prepared by carbonization process at 500°C for 1 hours using 10% ZnCl2 activator and sieving with a filter size of 200 mesh. The activated carbon product is then tested using proximate analysis. The results of the proximate analysis show that activated carbon has met SNI 06-3730-1995 with a ash content of 8,2%. Keywords: Activation, Activated carbon, Rubberwood
Penentuan Model Kesetimbangan Adsorpsi Ion Pb(II) Menggunakan Regenerated Spent Bleaching Earth (RSBE) Sasmitra, Dani; Yusnimar, Yusnimar; Fadli, Ahmad
Jurnal Online Mahasiswa (JOM) Bidang Teknik dan Sains Vol 7 (2020): Edisi 1 Januari s/d Juni 2020
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Abstract

Spent bleaching earth (SBE) is a waste produced by the bleaching unit in the palm oil refinery industry. One of the efforts to tackle SBE waste is regenerated into regenerated spent bleaching earth (RSBE) which can be used as an adsorber of heavy metals in water waste such as Pb(II) from industry. This study aims to determine the characteristics of the SBE and RSBE, the adsorption equilibrium time, the adsorption capacity of the RSBE with variations in the concentration of Pb(II) ion and the adsorption temperature and determine the appropriate adsorption isotherm model. In this study, SBE was regenerated by extracting oil by soxletation at 72oC for 5 hours with n-hexane solvent, followed by washing with 3% HCl and then physically activated at 470oC for 12 hours. A total of 1 gram of RSBE was mixed with Pb(II) solution with a volume of 100 ml at various concentrations (20, 30 and 40 ppm) and adsorption temperatures (40, 50 and 60°C). The results showed that the absorption of Pb(II) ion by RSBE reaches equilibrium after 150 minutes contact time and the adsorption that occurs follows the Langmuir isotherm adsorption model with a correlation coefficient (R2) value of 0,9935 and a maximum absorbing capacity value of 4,29 mg Pb(II)/g RSBE that occurs at variations in the concentration of 40 ppm and a temperature of 60°C. Keywords: adsorption, adsorption isotherm, Pb(II) ion, RSBE, SBE.
Potensi Pembuatan Pupuk Dalam Bentuk Pelet Dari Bottom Ash Dan Fly Ash Industri Pulp Dan Kertas Untuk Hutan Tanaman Industri Fortuna, Dewi; Helwani, Zuchra; Bahruddin, Bahruddin
Jurnal Online Mahasiswa (JOM) Bidang Teknik dan Sains Vol 7 (2020): Edisi 2 Juli s/d Desember 2020
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Abstract

Bottom ash and fly ash derived from the ash burning bark in the boiler unit of the pulp and paper have the potential to be used as fertilizer because they contain macro and micro nutrients needed by plants. This study aims to determine the potential of bottom ash and fly ash as pellets. Physically, fertilizer in pellet form has smaller volume and easily stored and transported. The experiment were performed with two variable treatment which are the comparation of bottom ash with fly ash (0:100, 25:75,50:50, 75:25 and 100:0) and the adhesive doses (0%,0,5%,1% and 1,5%). The physical properties of resulting pellets were tested including density, water holding capacity, and durability. The effect of pellets on the growth of tomato plants were also carried out. Based on the analysis of research results the pellets meet minimum requirements of organic fertilizer and soil conditioner according to Indonesian National Standard (SNI 7847:2012) and PERMENTAN No.7 year 2011 unless C-Organic. The pelletization of fertilizer to the size of 5 mm can be done by adding adhesive cassava starch 1% with the physical properties of the pellets including a density of 1,724 g/mL, water holding capacity of 65,14% and durability of 93,89%. The use of pellet fertilizer with 100% fly ash has a good effect on the growth of tomato plants, seen from the growth of tomato stem height which is faster than without using pellet fertilizer. Keywords: bottom ash, cassava starch, fertilizer pellet, fly ash, tomato plants

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