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INDONESIA
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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Ketahanan Gambut Terstabilisasi Semen Dan Kapur Terhadap Kebakaran Menggunakan Pendekatan Variasi Kadar Air Juliasman, Rendy Dwi; Muhardi, Muhardi; Wibisono, Gunawan
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

A peatland is an area with naturally accumulated decayed organic materials (peat) at the surface. Riau Province has the largest peatlands in Sumatra i.e. 56.1% from the total peatlands in Sumatra. Peat fires have been many times occurred in Indonesia. Stabilization proven to preverent peat fire in Malaysia. Most common available stabilization materials are cement and lime. Research conducted by Zamzam (2017) showed that peat mixed with 5% lime and 15% cement at 100% moisture content, could increase its strength and became less combustible. This research attempts to correlate the mechanical properties of peat that stabilized with cement and lime at various water contents, and its burning resistance. Several water contents applied were 51.52%, 76.77%, 81.82%, 102.02%, 107.07%, and 112.12%. The burning tests were not conducted on sample of 51,52 % water content. The result showed that the optimum strength of stabilized peat mixtures achieved at water content of 76,77%, which had UCS and soaked CBR value of 97.35 kPa and 16,23%, respectively. The burning test showed that the higher the water content, the delay combustible the peat sample,however the mechanical test and burning tests showed the opposite results.Keywords: peat fire, cement, lime, CBR, and UCS.
Optimasi Jalan Pahat Proses Pemesinan CNC Lathe Dan Analisa Biaya Produksi Pembuatan Dead Center Berbantukan CAD/CAM Efrizal Saputra; Anita Susilawati
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

CNC is a machining process using a computer program, which one of its function that can arrange toolpath used in NC Code. This study aim is to obtain an optimal toolpath on CNC lathe machining process for making a dead centre. The design of toolpath and simulation to know the time of the process of making dead centre use a software mastercam v9. This research method is done on the rough process of making the geometry shape of the workpiece using 3 schemes of the toolpath. longitudinal, surface to parallel and diametrical . The toolpath consists of two absolute and incremental reference methods. This research revealed the processing time of the scheme for the longitudinal absolute of 22 minutes 43 seconds, the surface to parallel scheme of 22 minutes 45 seconds and the diametrical scheme of 33 minutes 41 seconds. In the incremental scheme the timing process of the longitudinal scheme was 21 minutes 36 seconds, the surface to parallel scheme of 22 minutes 4 seconds and the diametrical scheme of 31 minutes 45 seconds. The fastest time in 3 schemes to making the dead centre was the longitudinal sceme, which used incremental method. the most economical cost for making the dead center using longitudinal incremental . Rp.112.635 and the most expensive using diametrical scheme Rp.116.941.Keyword: Absolute, CNC Lathe, Dead Center, Incremental, Simulation, Toolpath
Pembuatan Bioetanol Dari Mikroalga Limbah Cair Kelapa Sawit Dengan Variasi Konsentrasi Ragi Menggunakan Saccharomyces Cerevisiae Sandy Juliana Sari; Shinta Elystia; Sri Rezeki Muria
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

Energy consumption is increasing steadily with the population growth and industrial development. Therefore, a substitute should be found. Bioethanol has been pointed out as a solution for variety complex problems related to energy and environmental issues. One of material that has potential to be used as raw material for bioethanol is microalgae. Microalgae Chlorella pyrenoidosa can be lived in wastewater, such as in palm oil mill effluent. Chlorella pyrenoidosa has been considered to be aviable and renewable feedstock for bioethanol production because it high carbohydrates contain. Chlorella pyrenoidosa is hydrolyzed into glucose for further fermented into bioethanol. This research aimed to observe the best condition on fermentation process by concentration of yeast are 10%, 15%, 20% and 25%. Measurement of bioethanol concentration using refractometer. The analysis show the highest concentration of bioethanol was 0,28% using yeast 25%.Keywords : Chlorella pyrenoidosa, hydrolysis, fermentation, bioethanol
Studi Implementasi Directional Earth Fault Protection Pada Proteksi Bay Penghantar 150 KV Garuda Sakti - Teluk Lembu Anggoro, Arief Sandy; Hamdani, Eddy
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

In order to optimize High Voltage Transmission Line Protection when a phase to ground fault occurs with high resistance value is implemented DEF (Directional Earth Fault) as protection feature on Distance Relay to detect this fault. Directional Earth Fault working method uses 3I0 residual neutral current detection related to zero order or negative sequence and 3V0 neutral voltage so that the DEF operation area is known both direction, minimum current and minimum voltages. High Voltage Transmission Line Protection in section 150 kV Garuda Sakti - Teluk Lembu is implemented DEF through stages of recording data collection of disturbances from previous conditions as reference of high-resistance ground phase conditions for comtrade playback record method, Simulation of transmission conditions and equipment during the disturbance conditions using Digsilent 14.0 study simulation for power system and short circuit circuit analiysis, application of relay protection protocol manufacturer Schneider type Micom P442, and simulation of individual testing using Omicron CMC 356. Each stages of DEF implementation of this study will be fulfilled when the results of simulation succed and final settings implementation on the protection relay with good individual test results.Keywords : DEF, High Resistance, Comtrade.
Eksperimen Probabilitas Stopping Set pada Coded Random Access (CRA) Untuk Jaringan IoT Nola Gabriella Hutapea; Yusnita Rahayu; Khoirul Anwar
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

By increasing of users/devices number, Coded Random Access mechanism is suitable to enable successful access wireless successfully on super dense network. Problem of using Coded Random Access is stopping set appears. Stopping set is a harmful structure, where no other way for some trapped users in a set to be decoded. Stopping set is affected by degree distribution. This paper presents probability experiment of stopping set on Coded Random Access for Internet of Thing (IoT). It uses MATLAB R2016a as tool proving. The result of this research is used as performance networking prediction of future IoT. The results confirm that this research has a highly accuracy opportunity and becomes so practical. Then, a new graph stopping set is found on the result of simulation. The number of user/device randperm, ˄(x) and G affect the probability of stopping set on CRA for IoT network. More G approaches 1, the more number of stopping sets too appear and vice versa. For probability of stopping set on Coded Random Access, if G more keeps from 1, so occetence of stopping set on CRA prpbability is smaller. On the other side, if G gets closer to 1, so appearance of stopping set on CRA, probability is bigger.Keyword : Super Dense-Network, Coded Random Access, Stopping Set.
Perancangan 7GHz Microwave Link Ujung Batu-Pasir Pengarayan Nasution, Abdul Risyal; Rahayu, Yusnita
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

This paper proposed a reliable microwave backbone link design from Ujung Batu to Pasir Pengarayan by taking into account the antenna height and the distance. Pathloss 4.0 is used for designing microwave link and link budget analysis. A repeater is added between Ujung Batu to Pasir Pengarayan in order to improve the performance. This is due to an existing highland in between that affect to the antenna height. Mini link 7HC 128 QAM and Andrew antenna P8-6812 are used as microwave equipments. Design microwave links Ujung Batu- repeater and microwave link repeater – Pasir Pengarayan have availability 99.996%. Space diversity technique id used to improve the system as recommended by ITU-R G 826 of 99.999% availability.Keywords : Link budget, Space diversity, Availability, Pathloss 4.0
Pengaruh Konsentrasi Asam Terhadap Aktivasi Lempung Palas Dan Aplikasinya Sebagai Katalis Pada Pembuatan Biodiesel Dari Minyak Nyamplung Dengan Variasi Kecepatan Pengadukan Renia Navivin; Syaiful Bahri; Wisrayetti Wisrayetti
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

This study aims to produce biodiesel from calophyllum oil using acid-activated heterogene clay catalyst, determining catalyst and biodiesel characteristics and determining the selectivity of clay catalyst. The clay catalyst is prepared by grinding clay soil that has been dried to a size of -100 + 200 mesh, then clay is activated using H2SO4 0.5 N, 1 N and 2N solution. Then filtered using a vacuum pump. The solids are then calcined at 300ºC. The process of making biodiesel is carried out through two stages: esterification and transesterification, in transesterification process of stirring speed variation of 200 rpm, 300 rpm, 400 rpm, with catalyst weight of 3% by weight of oil, calophyllum oil sample weight 80 grams and methanol with ratio of oil to methanol 1: 12 is introduced into the transesterification reactor, the reaction lasting for 120 minutes at 60 ° C. This study yielded the largest biodiesel yield on 2 N activated acid catalyst with 400 rpm mixing speed velocity of 78.4%. Characteristics of the catalyst that has a surface area and ratio of Si / Al is large enough.Keywords: biodiesel, calophyllum, clay, transesterification.
Penerapan Metode Tegangan Harmonisa Ketiga Untuk Proteksi Gangguan Tanah Pada Stator Ranto Ramandana; Iswadi Hasyim Rosma
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

Short circuit from phase to ground (ground fault) occurring in one of the stator windings of the synchronous generator can cause serious damage to the winding. Therefore, graund fault protection system is required to protect the stator winding of the generator. The method used is to analyze the magnitude of the ratio of the third harmonic voltage of the generator terminal and the generator neutral (V3n/(V3n+V3t)). This method is proven to be able to protect ground fault near neutral point or when low fault current occurred where conventional method is not able to react. To understand that the method is able to protect the fault near the neutral point then the simulation of faults were varied by the variation of fault resistance. It has been found from the result of the simulation that the method has capability to protect 60% stator winding from neutral. The 40% of unprotected winding will be protected by using conventional method in order to have a100% protection performance.Keywords: matlab, stator ground fault, the third harmonic protection
Analisa Kestabilan Peralihan Multimesin Pada Sistem Tenaga Listrik Wilayah Riau Reza Abdilla; Dian Yayan Sukma
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

Electrical energy is one of the energies that become a major part of human survival. Without electrical energy some human activities will be hampered such as trade, industry, education, etc. Within the area including Riau, the power system stability is very important. Power system stabilityare classified into three types, one of which is transient stability. This study aims to calculate and analyze the exact critical clearing time so that the system remains stable at the time of threephase symmetrical fault. The method used are fast decoupled method for power flow studies and the runge-kutta 4th order method to determine the rotor angle and critical clearing time using Matlab software. This study indicated that Riau's electric power system will remain stable if the critical clearing time is not more than 0.26 seconds.Keyword : Transient Stability, Three Phase Symmetrical Fault, Critical Clearing Time, Runge-kutta 4th Order Method
Analisis Respons Struktur Portal Baja Bertingkat Akibat Kandungan Frekuensi Gempa Yang Berbeda Afisha, Elly; Suryanita, Reni; Yuniarto, Enno
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

Indonesia is one of the countries that located in the quake zone. But not all earthquakes that occur is a devastating earthquake. Some earthquake parameters that affect the level of damage from a building structure are the peak ground acceleration, response spectrum value, earthquake duration, and earthquake frequency content. The earthquake frequency content parameters were considered the most influential on structural damage. The objective of this research is to get the response from the structure of multilevel steel portals such as displacement, inter-story drift, velocity, acceleration, and to analyze the displacement limit based on SNI 1729-2012. The reviewed structure is an open frame steel building model that is into 5 levels, 10 levels, and 15 levels. This study use time history analyses with 9 earthquake recordings of the Kobe earthquake, Mexico earthquake, Nepal earthquake, Chile earthquake, New Zealand earthquake, Sumatera earthquake, Fredericksburg earthquake, Mentawai earthquake, and Northridge earthquake that has been grouped into low-frequency content, medium frequency content, and high-frequency content. The results showed that the structure responses such as displacement, velocity, and acceleration will increase with the increasing number of levels of the building structure. The inter-story drift the allowed level of the structure still qualified based on SN 1729-2012 where the allowed drift in 7 cm and the inter-story drift produced by the structure is still less than 7 cm. An earthquake with low-frequency content has an enormous influence on the structure response in all the level structure.Keywords: response structure, time history, frequency content

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