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INDONESIA
Jurnal Online Mahasiswa (JOM) Bidang Teknik dan Sains
Published by Universitas Riau
ISSN : -     EISSN : -     DOI : -
Core Subject : Engineering,
Engineering
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Articles 3,145 Documents
 103   104   105   106   107 
Analisis Laju Perubahan Garis Pantai Pulau Karimun Besar Menggunakan DSAS (Digital Shoreline Analysis System) Dian Kharisma Dewi; Sigit Sutikno; Rinaldi Rinaldi
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

Shoreline changes could occurred because of hydrodinamically nature in coastal zone. The purpose of this study is to identify and approximating rate of shoreline changes which occurred in Karimun Besar Island. This study used to analyzed shoreline changesbased on remote sensing (satellite) data that processed by GIS (Geographic Information System). Then, to analyze the rate of its shoreline changes using DSAS (Digital ShorelineAnalysis System) with LRR (Linear Regression Rate) statistic method. The result found that shoreline has changes through 25 years (1991-2016) that abrasions are 1,63m/y and accretions are 3,78m/y.Keywords : Shoreline Changes, Satellite Data, DSAS
Pengujian Prestasi Kincir Air Tipe Overshot Di Irigasi Kampus Universitas Riau Dengan Penstock Bervariasi T Harismandri; Asral Asral
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

Currently the electricity has became a major requirement for human life. To fulfill the needs of electricity, the society used normally rely on state power generation company. Besides, that seemingly to electricity can be generated by means of utilizing the potential of natural energy that is around us. One untapped sources of the potential energy is energy of water, which in reservoirs of an environment campus of the University of Riau. According surveys, reservoir’s Riau University has head of 0.7 m and flow of 0.02 m3/s. This data used as a basis data to design type of overshot waterwheel. The waterwheel was tested by varying the penstock shape i.e cylindrical and rectangular. Based on design method was produced the diameter of waterwheel, the number and size of the blades as well as the sizes of penstock. The outside diameter and inside of wheel were 0.6 m and 0.5 m. Number of blades were 18 pieces with an area of 0,01m2. Then, the cylindrical penstock has 0.089 m of the diameter, whereas rectangular penstock sized of 0.1 m of wide and 0.1 m of high. Maximum power output was generated by the waterwheel with a cylindrical penstock of 21.05 Watt and efficiency of 43.78%, while for rectangular penstock was indicated the maximum power output of 19.8 Watts and efficiency of 42.40%.Keywords : PLTPH, Design of Water Wheel, Penstock
Pembuatan Komposit Bioplastik Konduktif Berbasis Tepung Tapioka Dengan Penambahan Electrochemichal And Mechanical Liquid Exfoliation Graphene Heri Rahmana; Amun Amri; Syelvia Putri Utami
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

Conductive bioplastics are biodegradable plastics that have a good ability to conduct electrical current. This study aims to create a conductive tapioca-based bioplastic composite with the addition of EMLE graphene (Electrochemical and Mechanical Liquid Exfoliation) and study the effect of the amount of EMLE graphene addition to the tensile strength and transparency of bioplastics. Conductive bioplastic production was held by using solution intercalation method. The main raw material was tapioca flour as matrix and graphene as filler. Graphene can be produced by using the Electrochemical and Mechanical Liquid Exfoliation method which made in the liquid phase and mechanically crushed or mashed by using a blender. The products were analyzed by using conductive bioplastic tensile test and transparency. The best tensile test value was 3.92 Mpa with elongation 8.516% in addition for 9% graphene and 30 minutes. The best transparency value was obtained 88.31% without graphene addition.Keywords: bioplastics, EMLE, graphene, solution intercalation, tapioca flour.
Efek Morfologi Penyisihan Polutan Pada Air Terproduksi Dengan Sistem Lahan Basah Buatan Terhadap Tanaman Typha Latifolia Aprilya, Sondang Ita; Andrio, David; Elystia, Shinta
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

Produced water has a complex composition and more than 40% is discharged into the environment. Constructed wetlands is one of the water produced treatment systems that use vegetation, media, and microorganisms for pollutants removal. The objectives of this research were to determine the effect of pollutants removal for Typha Latifolia morfology. Subsurface constructed wetlands is used in this study. The reactor is made with gravel, sand, and soil medium and uses Typha Latifolia as a plant. This research consist of detention time 1,3,5,7,9 day. The experimental result shows that 9 days of detention time, Typha Latifolia has average growth rate 31 cm and weight gain was 0,6 kg.Keywords: Constructed wetland, Subsurface flow, Typha latifolia
Pengaruh Massa Adsorben Batang Pisang Dan Waktu Kontak Adsorpsi Terhadap Efisiensi Penyisihan Fe Dan Kapasitas Adsorpsi Pada Pengolahan Air Gambut Suziyana Suziyana; Syarfi Daud; Edward HS
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

Air peat surface water that has a dark brown, is acid, levels of iron and manganese is high and has a high organic content. There are negative effects if used directly and continuously without treatment. The aim of this study is to calculate the removal efficiency of metal Fe on the peat water and calculate the adsorption capacity adsorbent of banana stems. Variables used in this study is a variation of the mass of adsorbent 1; 1,5; 2; 2,5 grams and a contact time of 15, 30, 60 and 90 minutes. The maximum removal for Fe metals occur in a mass of 2,5 grams and a contact time of 30 minutes with the adsorption efficiency of 80,31%. The adsorption capacity is 0,027 mg Fe / g on the mass of 1 gram with a contact time of 30 minutes. Type adsorbent banana stem adsorption Fe is Freundlich isotherm assumed coating formed multilayer by R2 of 0,989.Keywords: Adsorption, Peat water, Banana stems adsorbent, Adsorbent mass, Contact time
Evaluasi Kegagalan Penyedia Jasa Konstruksi Dalam Proses Pengadaan Jasa Konstruksi Dengan Sistem Elektronik (Studi Kasus: Dinas Pekerjaan Umum Kabupaten Pelalawan) Liya Prihatini; Alfian Malik; Ryan Tri Komara
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 study discusses the failure of construction service providers in the procurement of goods / services construction with elektroknik system, competition for winning the auction happens to each contractor who will eventually obtained a contractor is selected as the winner. On the other hand, contractors who follow the auction fails to win the auction, this event certainly detrimental to the contractor. This study aims to determine the variables and the percentage of failure of the failure of the procurement process of construction service providers on government projects particularly in the Public Works Department Kab. Palalawan. The study on procurement of construction services procedures require that the contractor seeks to ways to win the auction. Research data obtained from questionnaires distributed to counterparties contractor and confirmed by interviews of the ULP Party Public Works Department and LPSE Kab. Palalawan. Data processing manually using Microsoft Excel and presented in a bar chart (Bar Chart). Based on these results, the variable most dominant failure of the failure of the procurement process evaluation phase of construction services provider administration in 2012 was (9.1%), the year 2013 was (12.5%), the year 2014 was (16.1 %), the technical evaluation stage of the year 2012 was (9.8%), in 2013 was (8.6%), in 2014 was (15.6%), Stage price evaluation in 2012 was (31.8 %), the year 2013 was (33.3%), in 2014 was (37.5%). Evidence evaluation stage qualification in 2012 was (23.5%), in 2013 was (18.8%), in 2014 was (20.0%).Keyword : Construction, Failure Factors, Electronic Systems (E-procurement), Auction
Analisis Tegangan Tembus Arus Bolak Balik Pada Minyak Nyamplung (Colophyllum Inophyllum) Sebagai Alternatif Isolasi Cair Luchman Wira Admaja; Fri Murdiya
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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This study is looking for the ratio of breakdown voltage between mineral oil and Colophyllum Inophyllum oil as an alternative of liquid insulation. The test of oil uses a yellowish half-ball electrode, yellowish ball electrode, and aluminium balls electrode. The value of oil breakdown voltage Colophyllum Inophyllum is higher than mineral oil. By test result, breakdown voltage that a yellowish half ball electrode is higher than by ball electrode and aluminium ball electrode. This study also varies electrode, gap space, and water level on Colophyllum Inophyllum oil to determine the effect of breakdown voltage. Less water level in oiled higher of value of breakdwon voltage is higher. To be alternative liquid insulation must fulfill with the standared spesifications liquid insulation with Colophyllum Inophyllum oil has been met some certain criterias such as breakdown voltage, flash point, viscocity, and water content. On the other side spesifications of density and pour point do not meet yet the standared spesifications of liquid insulation.Keywords: Liquid insulation,breakdown voltage, Colophyllum Inophyllum oil
Kajian Penempatan Penambahan Recloser Menggunakan Metoda Algoritma Genetika Studi Kasus Penyulang Out Going Feeder 19 Bakti PT PLN (Persero) Rahmahani Setiawati; Dian Yayan Sukma
Jurnal Online Mahasiswa (JOM) Bidang Teknik dan Sains Vol 4, No 1 (2017): Wisuda Februari Tahun 2017
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Abstract

Reliability is an important parameter in electric energy distribution. The determination of recloser position has an important rule, especially in reliability of electical power system. Parameter used in reliability electrical power system is SAIFI (System Average Interruption Frequency Index) and SAIDI (System Average Interruption Duration Index). SAIFI and SAIDI can be calculated from the outage time and the failure rate occurred in one year. The research is implemented in 20 KV radial line system on feeder 19 Bakti PT PLN (Persero). The optimization method is using genetic algorithm. The following steps are : data collection there is disturbance line, forming of the objective function SAIFI and SAIDI, simulation using MATLAB programming and analyzing the position of recloser. The results are necessary to add new recloser on feeder 19 Bakti on 9,01 km from PMT Out Going. The reduction of SAIFI are 35,748% and the reduction of SAIDI are 35,746 % . Fitness value after the research is 0,0013.Keyword : recloser, reliability, genetic algorithm
Analisis Indeks Kekeringan Meteorologis Lahan Gambut Di Pulau Bengkalis Sinta Afdeni; Sigit Sutikno; Yohanna Lilis Handayani
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

This study analyzed meteorological drought in peatlands area using Tropical Rainfall Measuring Mission (TRMM) rainfall satelit data. Bengkalis Island, Indonesia was picked up as study area of this research because Bengkalis area is vulnerable against peat fire. The index of meteorological drought was analyzed using Standardized Precipitation Index (SPI) method based on Geographic Information System (GIS). The period of calculation were conducted on monthly and half monthly period. The result it was found that the SPI dryness index in each grid was almost the same or had no significant difference, where there was no dry and wet period simultaneously in the same time period. In the half monthly period, the lowest SPI score was -4,710 and the highest SPI was 1.903. While in monthly period, the lowest SPI value is -2,806 and the highest SPI value is 1,914. Keywords: meteorological drought index, SPI, TRMM, GIS
Bahan Bakar Padat Dari Pelepah Sawit Menggunakan Proses Karbonisasi Dengan Variasi Ukuran Bahan Baku Dan Suhu Qurotullaili Qurotullaili; Komalasari Komalasari; Zuchra Helwani
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

Palm frond so far only used as a source of raw materials for animal feed, compost and organic fertilizer in the plantation. Palm frond has a calorific value of 15,184.05 kJ/kg. Utilization of palm frond as main material of solid fuel production with carbonization process can reduce the problem of oil palm plantations waste and can be increased the calorific value of product. The aims of this study is to produce solid fuel from palm fronds by using carbonization process and analyze solid fuel quality from palm frond with variation of raw material size and temperature. Variation of carbonization temperature were 450°C, 500°C and 550°C. Variation of raw material size 1.68 – 2.38 mm (-8 +10 mesh), 0.84 – 1 mm (-16 +20 mesh) and 0.42 – 0.5 mm (-32 +35 mesh). Water content were 3.66 – 4.86%, ash were 9.39 – 16.17%, volatile were 9.45 – 28.60% and fixed carbon were 57.26 – 70.01%. The highest caloric value was 28,410.94 kJ/kg for 550°C of carbonization temperature and 0.42 – 0.5 mm (-32 +35 mesh) of raw material size.Keywords : biomass, caloric value,carbonization, palm frond

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