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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
 265   266   267   268   269 
Uji Keterawetan Kayu Karet (Hevea Brasiliensi Muell. Arg) Menggunakan Bahan Pengawet Biocide Pangestu, Hizbulah; Fakhri, Fakhri; Kamaldi, Alfian
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

Rubber wood (Hevea brasiliensis, Muell Arg) belongs to the Euphorbiaceae family. Rubber wood is susceptible to fungal attack, especially blue fungus (blue stain). The use of wood preservatives is the most effective way to improve the quality of wood. wood preservation is an understanding that talks about the amount of preservative that seeps into wood. This study aims to determine the durability of rubber wood by three of absorption, retention and penetration. The research method was carried out by cold immersion with a preservative used was Biocide-TCMBT / MBT with a dosage of preservative used 0,25%, 0,50%, 0,75% and 1% of water, with a number of sample repetitions five times with. The results of the absorption test that have been carried out the absorption value of immersion for 36 hours have a higher value than the absorption value of immersion for 5 minutes, 12 hours and 24 hours in all variations of the dosage of preservatives. The results of retention testing that have been carried out show that the retention value of rubber wood samples with a preservative dose of 0,25 %, 0,50 %, 0,75 % and 1% does not meet the retention standard, namely: 8kg / m³ (SNI 03-5010.1, 1999). The results of the penetration test that have been carried out show that the penetration value of rubber wood samples with a preservative dose of 0,25 %, 0,50 %, 0,75 % and 1% does not meet the penetration standard, namely: 5mm (SNI 03-5010.1, 1999). Keywords: Rubber Wood, Biocide, Absorption, Retention, Penetration
Analisis Numerik Kuat Lentur Sumbu Lemah Dan Sumbu Kuat Balok Baja Profil C Kanal Menggunakan Stiffener Tia Aurelia; Reni Suryanita; Ismed Diyanto
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

One of the steel sections that is widely used is the C channel section. C channel sections are generally used as purlins. C channel beam has a large ratio of width to height. This can lead the element of structure to failure such as buckling. So, the stiffener was used on the beam to prevent buckling. This study aims to analyze the effect of using stiffener on the C channel steel section. The analysis of the effect of stiffener on flexural strength was carried out using LUSAS V18 finite element. The test object was modeled with 2 objects using stiffener and 2 objects without stiffener. The result of the numerical analysis using the LUSAS V18 finite element showed that the load capacity of B1-2 had increased by 5.88% from the B1-1. The beam in the strong axis direction without stiffeners had the maximum load of 17 kN with a deflection of 18.67 mm, while the beams with stiffeners had the maximum load of 18 kN with a deflection of 13.346 mm. In the weak axis direction, the result shows that the load capacity of B2-2 had increased by 20% from the beam B2-1. The beam B2-1 had the maximum load of 10 kN with a deflection of 18.29 mm, while the beams with stiffener had the maximum load of 12 kN with a deflection of 27.46 mm. So it can be concluded that the use of stiffeners can increase the load capacity.Keyword: C Channel Section, Stiffener, Deflection, LUSAS, Strong Axis
Variasi Molaritas Naoh Pada Stabilisasi Geopolimer Abu Terbang Dengan Tambahan Portland Composite Cement Oktariyansa, Randy; Wibisono, Gunawan; Olivia, Monita
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

Land as a supporting media for the establishment of structures is an important part to consider. Peat soils have a very low carrying capacity, very high compressibility and others that are not favourable for construction. This study aims to examine the strength of stabilized peat soils using fly ash geopolymers with the addition of PCC cement (Portland Composite Cement). Soil stabilization using geopolymer added ingredients as an alternative in soil improvement in construction. Cement was used from a variation of 20%, 25%, and 30% by weight of the total binder used. The alkaline activator solution used consists of a solution of Sodium Hydroxide (NaOH) and a solution of sodium silicate (Na2SiO3), NaOH concentrations used were 10 M, 12 M, and 14 M. Stabilization of peat soils with 7, 28, and 56 days treatment. It is obtained that at the age of 56 days, the compressive strength value of peat soil is 152,3 kPa, 162,55 kPa, 142,02 kPa, respectively at the NaOH concentration of 10M, 12M, 14M. The NaOH molarity influences the compressive strength of the soil stabilized with the geopolymer. The lower the water water content of the test material, the higher the compressive strength of the soil. Keywords : Stabilization, peat soils, geopolymers, fly ash, Portland Composite Cement
Kajian Pemanfaatan Limbah Faba (Fly Ash Dan Bottom Ash) Pada Konstruksi Lapisan Permukaan Jalan (Top Layer) Vira Afrilla; Alfian Malik; Mardani Sebayang
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

Asphalt is one of the materials used in road construction, this material was chosen because it can produce flexible, safe and comfortable pavement. One of the functions of adding fillers is to minimize the use of asphalt base materials, where this filler has a significant effect because it functions as a cavity filler. The filler used is factory waste, namely fly ash and bottom ash. Fly ash is the residue from burning coal in power plants. Bottom Ash as well as fly ash is the result of burning coal, the ash that is produced when burning coal that settles. The purpose of this study was to determine the effect of using FABA waste (fly ash and bottom ash) on the quality of the road surface construction layer (top layer). The proportions of fly ash and bottom ash used are 2%, 4%, 6%, 8% and 10% of the total weight mixture of the mixture where each variation of fly ash is 55%: 45% bottom ash. Marshall characteristic test results show that the addition of fly ash and bottom ash to the AC-WC mixture can increase the value of stability and the of void filled with asphalt (VFA) and can reduce the value of void in the mixture (VIM) with certain filler levels according to the tests that have been carried out which can be used in the field, namely variation 2 %, 4%, 6% and 8%. The optimum variation of fly ash and bottom that can be added to AC-WC mixture 2% of the total aggregate weight. This value is based on the high stability value compared to other variations is 1654,74 kg. Keywords: AC-WC, Bottom Ash, Filler, Fly Ash, Top Layer.
Efisiensi Biosorpsi Logam Fe Menggunakan Sisa Media Hidup Jamur Coprinus Comatus Pada Air Gambut Santi Dwi Putri; Elvi Yenie; Aryo Sasmita
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

Spent mushroom substrate, a renewable bio-waste from mushroom-growing industry, was used as a biosorbent to remove ion Fe metal in peat water. The purpose of this study was to determine metal removal efficiency of Fe in the peat water. Fixed variables used in this study is the stirring speed of 120 rpm and a contact time of 60 minutes. For independent variables used consisted of adsorbent mass variation of 0,1; 0,3; 0,5; 0,7; 0,9 g and a particle size variation 60, 100 and 140 mesh. The results showed highest removal efficiency of Fe metal concentration on peat water treatment by biosorption onto Coprinus comatus spent mushroom substrate at mass of biosorbent 0,9 g with a particle size of 140 mesh, with removal efficiency for fe metal concentration and color respectively amounted to 88,31%. Keywords: Biosorption, spent mushroom substrate, mass variation, Fe, peat water
Implementasi Metode Simple Additive Weighting (Saw) Dalam Sistem Pendukung Keputusan Pemilihan Jenis Smartphone Berbasis Web Wasilah Wasilah; T. Yudi Hadiwandra
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

A smartphone is a breakthrough of mobile devices that designed to make communication easier. The increasing number of sophisticated features on the smartphone allows users to do many things, such as making video calls, online shopping, and even making real-time direct transactions by only using a smartphone. When consumers are going to purchase a smartphone, they are faced with lots of available features so that consumers hardly decided which smartphone suits their needs. As a result, consumers must conduct one by one surveys regarding the smartphone that they are going to buy. According to the reasons, the decision support system in choosing a smartphone through the Simple Additive Weighting (SAW) method can help consumers to select their desirable smartphone without conducting one by one surveys. This system is built using Codelgniter Framework and MySQL database. The system was tested using the usability testing method and the accuracy method by comparing manual calculations with the existing calculations in the system. Based on the test results, it can be concluded that the system is proven to be accurate and feasible to use in assisting users in making smartphone selections. Keywords: decision support system, saw, web, smartphone.
Meningkatkan Keamanan Data Dalam Berbagi File Menggunakan Kriptografi Asimetris Elliptic Curve Cryptography P-521 Ramadhan, Ashry; Marpaung, Noveri Lysbetti
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

Cryptography has been aplicated into securing information. Cryptography divided into two types, Symmetric and Asymmetric Cryptography. Symmetric Cryptography commonly used for encrypt a file, while Asymmetric Cryptography used for create public key and private key for key exchange.. Elliptic Curve Cryptography (ECC) is the one of asymmetric cryptography that is commonly used for create a secure public and private key depending on the bit length of ECC, in this research use 521-bit length. Advanced Encryption Standard (AES) is the one of symmetric cryptography has been used as a standard for securing private data, in this research use 256-bit length. AES and ECC are provided by National Security of Standards and Technology (NIST) as a standard for national security applications. The system in this research created into Web Application base using HTML5, CSS3, and JavaScript. The results obtained from this research is the system can encrypt and decrypt any type of file like systems, videos, documents, images and audios file and has avalanche effect property.Keywords: Securing Information, Cryptography, ECC P-521, AES-256, Web Application
Optimalisasi Kualitas Jaringan Internet Menggunakan Web Proxy Berbasis WLAN Dengan Metode Penjadwalan (Studi Kasus Di SMK Negeri 1 Bandar Sei Kijang Kabupaten Pelalawan) Abu Hanifah; Dahliyusmanto Dahliyusmanto
Jurnal Online Mahasiswa (JOM) Bidang Teknik dan Sains Vol 8 (2021): Edisi 2 Juli s/d Desember 2021
Publisher : Jurnal Online Mahasiswa (JOM) Bidang Teknik dan Sains

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Abstract

This study aims to determine the optimization of the quality of the internet network using a WLAN-based Web Proxy with the scheduling method at SMK Negeri 1 Bandar Sei Kijang, Pelalawan Regency. This study uses the Action Research method, which was carried out in 2021. The measurement of internet network quality refers to the TIPHON standard with QoS parameters consisting of Throughput, Delay, Jitter, Packet Loss using the Wireshark application. This study uses the Action Research method through diagnosing, action planning, action taking, evaluating, and learning. The subject of this study is all students of class XI, which consists of eight study groups with a total of 219 students. The measurement and calculation of the quality of the internet network were carried out in two groups. The first group consists of four classes before using a WLAN-based web proxy with scheduling method and the second group after using a WLAN-based web proxy with scheduling method. The results of measurements and calculations show that using a WLAN-based web proxy with a scheduling method can optimize the quality of the internet network at SMKN 1 Bandar Sei Kijang. Before using WLAN-based Web Proxy with scheduling method the average index is 1.75 in the Poor category, but after applying the average index increases to 3.75 with the Satisfactory category. Keywords: Optimization, network, internet, proxy, scheduling
Analisis Kadar Air Terhadap Kualitas Karbon Aktif Dari Cangkang Buah Karet Rudea Faddhisrah Syahbana; Aryo Sasmita; Edward HS
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

Activated carbon is a material containing amorphous carbon which has an internal surface so that it has high adsorption. Activated carbon has the potential to be used as an adsorbent. This study aims to utilize rubber fruit shells as raw material for making activated carbon. Activated carbon was prepared by carbonization process at 500°C for 1 hours using 10% H3PO4 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 moisture content of 7,6%. Keywords: Activated carbon, Activation, Adsorption, Emission gas, Rubber fruit shells
Analisis Kecepatan Dan Arah Aliran Air Tanah Lahan Gambut Desa Dompas Kebupaten Bengkalis (Studi Kasus: Desa Dompas, Kabupaten Bengkalis) putri, Novalin; Sutikno, Sigit; Rinaldi, Rinaldi
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

Peatland is a type of land that is flammable. One of the causes is land dryness that is caused by the formation of many canal networks. To reduce the possibility of damage to land, a rewetting effort is made. Rewetting is done by building a canal blocker. The construction of canal blocking is an effort to increase the capacity of the water in peatlands, and also to be able to prevent the decrease of water level in peatlands. This study analyzes the velocity and direction of groundwater flow before and after the canal blocking which is measured with the Groundwater Velocimeter instrument on each monitoring well. Based on the groundwater flow analysis which uses the Groundwater Velocimeter method in Dompas Village, Bengkalis Regency, it can be concluded that the highest velocity of the groundwater flow before the canal blocking occured in SP1-2, based on the Image J method which obtained a velocity of 0.09 m/day, and for the visual method, the highest velocity SP 2-4 was 0.28 m/day. While the highest velocity of the groundwater flow after the canal blocking occured in SP 1-4, based on the Image J method which obtained a velocity of 0.107 m/day, and for the visual method, the highest velocity that obtained at SP 2-4 was 0.43 m/day. Keywords: groundwater velocimeter, canal block, peatland

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