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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
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Desain Filter Pasif Untuk Mereduksi Rugi-Rugi Harmonisa Akibat Variasi Beban Pada Laboratorium Komputer Dan Jaringan Teknik Elektro Universitas Riau Winner Inra Jefferson Batubara; Firdaus Firdaus; Nurhalim Nurhalim
Jurnal Online Mahasiswa (JOM) Bidang Teknik dan Sains Vol 2, No 1 (2015): Wisuda Februari Tahun 2015
Publisher : Jurnal Online Mahasiswa (JOM) Bidang Teknik dan Sains

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This study presents a harmonic filter design to reduce losses due to the load harmonic variations in Computers and Networks Laboratory of Electrical Engineering, University of Riau. Filter design is using ETAP software 7.5. Design passive filter using parameters from measurements made on the electrical panel Laboratory of Computer and Network by using a measuring instrument power quality analyzer KEW 6310. The parameters used are the active power (watts), reactive power (Var), apparent power (VA), and power factor (cos φ). ETAP simulation analysis process is done by modeling the entire charging circuit parameters with the actual condi-tions approach such as power grids, transformers, and cables. Harmonic orders reduced are order 5, order 7 and order 11. Harmonic filter is designed for all tests in order to meet the current THD is allowed IEEE stand-ard 519-1992 by 5%. Eight harmonic filters has been done in this case which three filters for harmonic 5th, three filters for harmonic 7th, and two filters for harmonic order 11th.Keywords: Passive Filter, Harmonic Order, ETAP
Pengaruh Tahanan Kaki Menara Type Gantry Terhadap Terjadinya Back Flashover Pada Isolator Saluran 115 Kv Pt. Chevron Pacific Indonesia Jefri Manik; Edy Ervianto; Nurhalim Nurhalim
Jurnal Online Mahasiswa (JOM) Bidang Teknik dan Sains Vol 2, No 1 (2015): Wisuda Februari Tahun 2015
Publisher : Jurnal Online Mahasiswa (JOM) Bidang Teknik dan Sains

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This study describes analysis of tower footing resistance effected backflash voltage across a transmission line 115 kV insulator at PT. Chevron Pacific Indonesia. Back flashover analysis on insulator string provides ATP software for simulation. Analysis process is done by the entire transmission line parameter model such as a tower, lightning impulse, power line conductor and tower footing resistance. The factor of this study includes,front time of lightning stroke, and tower resistance. Simulations is done with lighting strike on the tower and mid-span with four types of impulse. To analysis of tower footing resistance effected back flashover across a transmission system insulator, Simulations are done by varying the tower footing resistance from 1Ω - 30Ω. Over Voltage on insulator for every tower footing resistance will be compare to critical flashover insulator (CFO) in order to obtain the maximum resistance is allowed to avoid the back flashover on insulator.Keyword: Tower fotting resistance, Back flashover, ATP, Insulator
Desain Band Pass Filter Untuk Jaringan WiMAX 3.5 GHz Valentino, Novri; Safrianti, Ery; S, Linna Oktaviana
Jurnal Online Mahasiswa (JOM) Bidang Teknik dan Sains Vol 2, No 1 (2015): Wisuda Februari Tahun 2015
Publisher : Jurnal Online Mahasiswa (JOM) Bidang Teknik dan Sains

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The development of Broadband Wireless Access (BWA) today, not only the connections that are needed, but also speed internet access and large capacity. One of the BWA technology is currently used in IEEE 802.16d WiMAX standard. IEEE 802.16d WiMAX standard using a frequency of 3.5 GHz. Indonesian satellite using the same frequency with the frequency of WiMAX. To avoid interference between WiMAX and satellite receivers need to filter WiMAX. Band pass filter is present as a solution to overcome the problem of interference between WiMAX and Satellite. In this final report discusses the design of bandstop filter circuit consisting of components - namely passive components, inductors and capacitors. Responses were used in this design is the Chebyshev response for Chebyshev response can result in a high degree of steepness of the passband to stopband.Keywords : FM Modulator, Modulated Signal, Phase Locked Loop, Carrier Signal, Information Signal.
Konversi Termal Kayu Ketapang (Terminalia Catappa) Menjadi Bio-Oil Dengan Teknologi Pirolisis Menggunakan Katalis Ni/Nza Arbhy Indera Ikhwansyah; Syaiful Bahri; Edy Saputra
Jurnal Online Mahasiswa (JOM) Bidang Teknik dan Sains Vol 2, No 1 (2015): Wisuda Februari Tahun 2015
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Availability of petroleum as a fuel that can not be updated further reduced by increasing the use of oil for human needs. For that we need to do a conversion innovation of energy that donot depend on fossil resources and can be renewable and have an output similar to that produced from fossil resources. One such innovation is the conversion of biomass derived from terminalia catappa wood to bio-oil. Bio-oil can be produced by pyrolysis of terminalia catappa wood with catalyst Ni/NZA. Objective this research to produce bio-oil from terminalia catappa wood as an alternative fuel, studying the effect of the weight ratio of the catalyst Ni/NZA to the biomass, studying the effect of metal impregnation Nickel (Ni) on Natural Zeolite deAluminated (NZA) and characterization of physical properties and chemical properties of bio-oil. Process pyrolysis was carried out at 320 0C, silinap 500 ml, 50 grams of biomass with + 100-200 mesh sieve size, variations in the catalyst Ni/NZA to thebiomass of 2%; 4% and 6% by weight and Ni metal variation on Natural Zeolite deAluminated (NZA) of 0%; 1%; 1,5% and 2%. The results of this study produce bio-oil yields the largest on the use of the catalyst Ni/NZA 4% by weight of the metal content of 2% by 68,22%. Characterization of physical properties of bio-oil obtained in the form of density 0,806 g/ml, 7,591 cSt viscosity, acidity 74,078 mg NaOH/g sample, flash point 45,971 0C andcalorific value 43,708 MJ/kg. While the characterization of the chemical properties of bio-oil using Gas Chromatography-Mass Spectroscopy (GCMS) obtained some dominant chemicalcomponents such as acetic acid and an area of 60,84%, 2-propanone with an area of 12,64%, 1,2-ethanediol with area of 8,60%, propionic acid and an area of 5,60% and methyl acetate and an area of 3,76%.Keywords: bio-oil, catalyst Ni/NZA, pyrolysis, terminalia catappa wood
Pembuatan Bioetanol Dari Nira Aren Secara Fermentasi Menggunakan Yeast Saccharomyces Cerevisiae Dengan Variasi Konsentrasi Inokulum Dan Waktu Fermentasi Elia Simanjuntak; Chairul Chairul; Maria Peratenta Sembiring
Jurnal Online Mahasiswa (JOM) Bidang Teknik dan Sains Vol 2, No 1 (2015): Wisuda Februari Tahun 2015
Publisher : Jurnal Online Mahasiswa (JOM) Bidang Teknik dan Sains

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Bioethanol is one of the alternative energy source that can replace fossil energy sources. Bioethanol is biochemistry fluid from fermentation process of sugar by using microorganisms. One material which has potential as raw material for bioethanol production is a palm juice which is economically valuable products of the sugar plant. Palm juice is used as raw material for ethanol because it contains sugar which is large enough around 12.04%. This research aimed to produce bioethanol with various concentration of inoculum 10%, 12.5%, 15% and 17.5% and fermentation time 24, 48, 72 and 96 hours at pH optimum 5. The process of fermentation using Saccharomyces cerevisiae yeast. The sample analysed by using alcoholmeter. From the research results, obtained the highest ethanol concentration of 8% (v/v) at 17.5% inoculum concentration variation with fermentation time 72 hours.Keyword: Bioethanol, Fermentation, Palm Juice, Saccharomyces cerevisiae
Hidrolisis Mikroalga Tetraselmis Chuii Menjadi Glukosa Menggunakan Solvent H2SO4 Dengan Variasi Waktu Hidrolisis Fajrina Qaishum; Amun Amri; Syelvia Putri Utami
Jurnal Online Mahasiswa (JOM) Bidang Teknik dan Sains Vol 2, No 1 (2015): Wisuda Februari Tahun 2015
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Indonesia is maritime countries with high marine biodiversity. Mikroalgae is marine biota which has an important role in an ecosystem water and it has the chemical composition such as, high carbohydrate, protein and lipid. Tetraselmis chuii is green microalgae that contains cellulose and hemicelluloses, which adequate were converted into glucose. Glucose is one of building compound for producing hydroksimetilfurfural, levulinat acid, formic acid, bio battery, bioethanol, etc. Glucose can be produced by hydrolyzing microalgae with dilute sulfuric acid use a solvent. Microalgae was dissolved in diluted sulfuric acid then heated at 100oC. The purpose of this research were obtained operation condition for biomass loading and hydrolysis time to glucose production. Tetraselmis chuii which biomass loading 3,5 gram disssolved in dilute sulfuric acid 1% during 10, 20, 30, 40 and 50 minutes. The result show that the highest concentration of glucose was obtained 7,27 g/L in biomass loading by using 3,5 gram of Tetraselmis chuii for 30 minute at 100oC.Keywords: dilute sulphuric acid, glucose, hydrolysis, microalgae, cellulose
Pembuatan Bioetanol Dari Nira Aren Menggunakan Proses Fermentasi Dengan Variasi Kecepatan Pengadukan Dan Waktu Fermentasi
Jurnal Online Mahasiswa (JOM) Bidang Teknik dan Sains Vol 2, No 1 (2015): Wisuda Februari Tahun 2015
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Bioethanol is a liquid sugar fermentation process results from a source of carbohydrate (starch) using microorganisms. Bioethanol is an alternative raw materials are cheap and environmentally friendly. One of the raw materials for bioethanol production is a palm juice. Aren is one of the most bioethanol feedstock and productive potential as well as a fairly high sugar content. Stirring speed is an important aspect which affects the quality of mixing in stirred tank. Fermentation time very big influence on the activity of yeast because the longer the fermentation, the more the number of increasingly active yeast or yeast to proliferate. The purpose of research to get the operating conditions for bioethanol production from palm juice on the highest level (%) with stirring speed and time variation of fermentation. Through the process of fermentation using yeast Saccharomyces cereviceae, glucose is converted into ethanol and carbon dioxide. Preparation starter made with yeast inoculum process Saccharomyces cereviceae at 10% of yeast fermentation medium so adaptable and ready for fermentation. Fermentation takes place in batches with a volume is 2 liters of fermentation medium, stirring speed variation 200, 250, 300 and 350 rpm and fermentation time variation of 24, 48, 72 and 96 hours. Ethanol concentration was analyzed by using alcohol meters. The optimum fermentation process is shown in the stirring speed of 350 rpm fermentation time-72 hours with yield obtained 82,53% and ethanol concentrations obtained 7% (v / v) or 55,25 mg / ml.Keywords: Aren, Bioethanol, Palm Sugar, Saccharomyces cerevisiae, Stirring Speed
Sintesis Hidroksiapatit Dari Cangkang Kerang Darah (Anadara Granosa) Dengan Proses Hidrotermal Variasi Rasio Mol Ca/P Dan Suhu Sintesis Affandi Affandi; Amun Amri; Zultiniar Zultiniar
Jurnal Online Mahasiswa (JOM) Bidang Teknik dan Sains Vol 2, No 1 (2015): Wisuda Februari Tahun 2015
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Synthesis of hydroxyapatite (HAp) from blood cockle shell (Anadara granosa) by hydrothermal process has been successfully done. The aim of this research was to get theoptimum process condition and also to investigate the influence of the Ca/P mole ratio and the synthesis temperature toward HAp characteristic. The powder of blood cockles shell wascalcined to get CaO which then was reacted with diammonium hydrogen phosphate by using water as solvent. Hydrothermal process was done by closed system in order to avoid thesolvent be lost while heating up above the solvent’s boiling point. The samples then were characterized by using FTIR (Fourier Transform Infrared), XRD (X-Ray Diffraction), andSEM (Scanning Electron Microscopy). The functional groups were observed in the FTIR of the synthesized HAp are phosphate (PO4 3-), hydroxyl (OH-), carbonate (CO3 2-), and hydrogenphosphate (HPO4 2-). These functional groups indicate that HAp has been formed. XRD data showed the main peaks for HAp that strenghtened the truth of FTIR characterization. SEM was used to observe the morphology of the synthesized HAp that consisted of agglomerates. Through analysis of the EDXA (Energy Dispersive X-Ray Analysis), the Ca/P mole ratio of the synthesized HAp could be counted where the result is 2. EDXA and SEM analysis were done together due to EDXA and SEM are one device. The best condition in this synthesis occured at Ca/P mole ratio 1,60 and the synthesis temperature 160oC.Keywords: blood cockle shell; hydroxyapatite; hydrothermal
Perancangan Algoritma Komputasi Heat Exchanger Network (HEN) Arini Puspita Ramadhanti; Zuchra Helwani; Hari Rionaldo
Jurnal Online Mahasiswa (JOM) Bidang Teknik dan Sains Vol 2, No 1 (2015): Wisuda Februari Tahun 2015
Publisher : Jurnal Online Mahasiswa (JOM) Bidang Teknik dan Sains

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Heat integration is a method used to increase energy efficiency in a circuit that process with utilizing the energy potential of other process units. The utilization of the energy potential ofother process units can be done with the installation of the Heat Exchanger Network (HEN) which aims to save usage utility either steam or cooling water, so that the production cost can beminimized. Design HEN need analysis, start from the analysis of the minimum energy efficient in a network that is calculate the Maximum Energy Recovery (MER) targets, design heat exchanger network system that is network design. In this research, the MER calculation using the temperature interval and network design using the pinch method. Goals at this research is to generate algorithm computation and tools computation for design HEN. Algorithm computation of MER calculation with temperature interval method consist of input, problem tablecomputation, cascade diagram computation and output. Algorithm computation of network design with pinch method consist of identification the flow on hot side and cold side, identification sream matching at hot side and cold side, calculation of heat (Q) of heat exchangers, analysis heat (Q) of heat exchanger, and analysis hot utility ( H Q ), cold utility, and(QC ) dan T . At MER calculation was obtained minimum hot utility ( hmin Q ), minimum cold utility ( cmin Q ), and pinch temperature ( pinch T ). Sythesis HEN was displayed in Grid Diagram. Design algorithm of computation was simulated by Java programming that is displayed by Graphical User Interface (GUI).Kata kunci : heat integration, Heat Exchanger Network (HEN), Maximum Energy Recovery (MER), network design, pemoraman Java. 
Pembuatan Biodiesel Dari Minyak Biji Karet Menggunakan Reaktor Membran Fauzi, Subehan; Syarfi, Syarfi; Bahruddin, Bahruddin
Jurnal Online Mahasiswa (JOM) Bidang Teknik dan Sains Vol 2, No 1 (2015): Wisuda Februari Tahun 2015
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One of the challenges in biodiesel manufacturing were the limited conventional mass transfer. The problem can be solved by using new technology in the biodiesel manufacturing process, namely tmembrane reactor. Membrane reactor has a close relationship to productivity and selectivity. This research aims to study the effect of variations in the molar ratio and transmembrane pressure on the characteristics and productivity of biodiesel. This research was conducted by two stages of preparation of rubber seed oil and biodiesel production using a membrane reactor. Rubber seed oil preparation process consists of stripping, drying, resizing, extraction and degumming. Biodiesel production is conducted by using H2SO4 catalyst, reaction time 6 h, reaction temperature 60°C, the variation of the molar ratio of 1:15, 1:20 and 1:25 and transmembrane pressure of 1 bar, 1.5 bar and 2 bar. Results of preparation of rubber seed oil yield of 19% was obtained with a free fatty acid content before and after degumming is 37.6% and 29.12%. The results showed the highest yield of biodiesel production amounted to 62.15% at a molar ratio of 1:20 and a transmembrane pressure of 1.5 bar. Biodiesel produced has a density of 0.880 g/ml, viscosity 7.73 mm2/s and flash point 180oC. The largest composition of biodiesel ie 26.5% of Oleic Acid Methyl Ester.Keywords: biodiesel, membrane reactor, rubber seed oil

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