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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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Optimasi Sistem Pengendalian Frekuensi Dengan Metode Kontrol Optimal Linier Quadratic Regulator Pada PLTU Muhammad Riski Hanifa; 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

A good and efficient generating system is essential to meet the growing demand of electricity. Stability is required in the generation process to operate optimally. One of important stability parameters is frequency stability. This stability can be achieved by controlling the frequency of power plant (i.e. steam power plant). Turbine-generator is one of the important parts in generating system where it converts mechanical energy into electrical energy. On a turbine-generator, frequency becomes the main reference parameter that identifies the normal or abnormal condition of power plant. The main problem in the power plant is sudden load changes that result in abnormal system frequency (to drop or to rise). This abnormal frequency may cause damage on part of power plant, therefore it is necessary to adjust the flow rate of steam into the turbine to obtain the nominal speed of turbine by putting a proper gain controller. The gain was estimated by using LQR method. It has been found from the results that power plant with proper gain controller is better to bring the frequency back to normal compare to without controller.Keywords : Frequency, steam power plant, Optimal Control, Matlab/Simulink, LQR
Preparasi Pelepah Sawit Untuk Bahan Baku Pembuatan Wood Plastic Composite (WPC) Ditinjau Dari Konsentrasi Asam Oksalat Dan Suhu Pelarutan Angelina Angelina; Bahruddin Bahruddin; Said Zul Amraini
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

Components contained in the palm stem are cellulose, hemicellulose, lignin, and other extractive substances. Cellulose is the largest component of palm fronds. Preparation is used to remove components of hemicellulose and lignin and extractive substances there by increasing the cellulose component which will increase the strength of the interface on the matrix and filler. The purpose of this study was to study the effect of oxalic acid concentration and dissolution temperature on the chemical composition of palm stem in the preparation of palm stem which will be used as raw material of wood plastic composite. Samples of palm stem preparations were prepared using oxalic acid at concentrations of 0,5 M, 1 M, and 1,5 M. Samples were immersed in 15 min with dilution temperature is room temperature, 800C, 1000C, and 1200C. Then the sample size of palm stem dust used is 40 mesh. Tests include water content test and chemical composition test of palm stem using chesson-data method. The test results show that the water content in the palm stem sample is 5% -10%. While for the best composition of the palm stem obtained by preparation using oxalic acid with concentration of 1,5M at dissolving temperature of 1200C that is obtained cellulose level as much as 54%.Keywords : palm stem, cellulose, preparation, wood plastic composite
Perancangan Kantor Pintar Berbasis Internet Haziq Hazman; Linna Oktaviana Sari
Jurnal Online Mahasiswa (JOM) Bidang Teknik dan Sains Vol 6 (2019): Edisi 2 Juli s/d Desember 2019
Publisher : Jurnal Online Mahasiswa (JOM) Bidang Teknik dan Sains

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Abstract

Internet of things (IoT) is a concept that connecting any devices in daily life such as: machine, building, or other devices using internet network. One of the application is in the office area. Along with the development of technology, the automatic system in each area like an office is needed and demanded for the employee. Because accessing electronic devices in an office manualy causes lack of comfort and effectiveness in working, so the employee who works needs automatic control of all the electronic devices in the office. In this research, it was made a smart office plan based on the internet that connects to a smartphone as a controller that can control the devices in the office such as a lamp, a fan, and an electric socket. The components that are used namely: A mikrocontroller arduino as a brain in this system, an Espressif Smart Connectivity Platform(ESP) module as the Wi-Fi module, and an Android Smartphone as the controller and status checker of the smart office system. Keyword: Arduino, ESP, Android, Smart office, IoT.
Pengaruh Kecepatan Pengadukan Pada Sintesis Biodiesel Dari Minyak Jarak Pagar (Jatropha Curcas L) Dengan Katalis La/Lempung Yenni Octavia; Syaiful Bahri; Khairat Khairat
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

The increased energy needs of fossil fuels in particular leads to a decline in the world’s oil reserves which make this extremely rare. One way to reduce the energy crisis and the impact that fossil-funded energy use can have is to develop new and renewable energies such as vegetable fuels. One of the alternative forms of energy currently being developed is biodiesel. Biodiesel is one of the environmentally friendly alternative to diesel fuel. This research studied the effect of agitation speed with variations 300 rpm, 400 rpm 500 rpm, metal that falls into clay with variations 1%, 3%, 5% and activation NaOH with variation 1N, 2N and 3N to the yield biodiesel produced, and to indentifying the characterictics of biodiesel produced. This study begins impregnation of La metal into clay, the La/clay catalyst is calcination for 6 hours at 500oC with N2 gas, oxidation for 2 hours at 400oC with O2 gas and reduction for 2 hours at 400oC with H2 gas. After that, do the process of esterification in the flat bed reactor the temperature reaction 60 oC and reaction time 60 minutes, and then process of transesterification with temperature reaction 60 oC, reaction time 90 minutes, ratio mole oil : methanol 1/9, and catalyst weight 3 % (w/w) oil. Highest biodiesel yield obtained amounted to 89,78 % at the agitation speed 400 rpm and metals La(5%)/clay activation NaOH 3N. Physical characterization of biodiesel were done such as density 884 kg/m3, kinematic viscosity 5.54 mm2/s, acid number 0.676 mg-KOH/g biodiesel and flash point 139 oC respectively which have accordance with the standards of Indonesian biodiesel (SNI 04-7128-2015). Keywords: BBN, biodiesel, esterification, La/Clay catalyst, transesterification
Sistem Informasi Pengarsipan Surat Masuk Dan Surat Keluar Berbasis Website Dan Whatsapp Gateway Di LPP RRI Pekanbaru Ayunda Widia Kusuma; Noveri Lysbetti Marpaung
Jurnal Online Mahasiswa (JOM) Bidang Teknik dan Sains Vol 6 (2019): Edisi 2 Juli s/d Desember 2019
Publisher : Jurnal Online Mahasiswa (JOM) Bidang Teknik dan Sains

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Abstract

In processing data on incoming and outgoing letters in LPP RRI Pekanbaru conducted by the secretary still has shortcomings namely the incoming and outgoing mail files have not been well organized. Inefficient in the process of searching for incoming and outgoing mail files, the secretary has to search one by one the letters stored in the folder, not to mention that the file is missing or scattered then it will take a long time to find the file. The purpose of this research is to create a web-based incoming and outgoing mail archiving information system and whatsapp gateway in LPP RRI Pekanbaru so that it can streamline the time in searching, data collection and making reports of incoming and outgoing letters. The programming language used in Information System Design is PHP Hypertext Preprocessor (PHP), Hypertext Markup Language (HTML), Javascript, and My Structured Query Language (MYSQL). While the system development method used is the Waterfall method. The results of the test based on the Likert calculation formula are as expected. And the Presentation Accuracy of the Questionnaire is 82.5, so the system is very amenable to use. The conclusion of this research is that it can facilitate the processing of letter data, the process of making reports, and facilitate the process of finding data.Keyword : Information System, Incoming Letters, Outgoing Letters, Disposition
Analisa Kecepatan Angin Di Jalan Jendral Sudirman Kota Pekanbaru Imalatunil Khaira; Aryo Sasmita; Shinta Elystia
Jurnal Online Mahasiswa (JOM) Bidang Teknik dan Sains Vol 6 (2019): Edisi 2 Juli s/d Desember 2019
Publisher : Jurnal Online Mahasiswa (JOM) Bidang Teknik dan Sains

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Abstract

Transportation is the most influential source in increasing levels of carbon monoxide (CO) in the air. Pekanbaru is the capital of Riau province which is experiencing rapid economic development that is a cause of population growth and increasing the number of motorized vehicles. The purpose of this study is to measure CO concentrations from mobile sources then compare them with PP No. 41 of 1999, calculating CO concentrations with the Gaussian Line Source Model, and mapping the predicted distribution of CO emissions on Jalan Jendral Sudirman, Pekanbaru City. The method used is counting the number of motorized vehicles, measuring the concentration of CO in the field, and measuring wind speed in the field. Based on the results of research that has been done, it can be concluded that the highest wind speed is in front of Sudirman Square on Thursday at 3.0 m / s while the lowest wind speed is in front of the Ramayana at 0.5 m / s on Tuesday and Wednesday.Keywords: Wind Speed, Jalan Jendral Sudirman
Kuat Tekan Mortar OPC Abu Sekam Padi Pada Suhu Tinggi Mirza Afrian; Monita Olivia; Zulfikar Djauhari
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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This research examines the partial replacement of cement mortar with the OPC by rice husk ash as a binding material. Rice husk Ash (RHA) has used silica content of 90%. Compressive strength was tests are carried out on the basis of the percentage of rice husk ash and its time variations of the treatment. Variation of rice husk ash used is 10%, 15%, and 20%. Samples was curing in water for 28 days before furnace with variations of temperature 250°C, 500°C, and 750°C for 3 hours. This research showed that a mixture of mortar with the replacement of the 15% rice husk ash cement against the OPC provides optimum results against compressive strength value, not only on the maintenance of room temperature but also at 250°C and 500°C. Compressive strength of all types of cement has increased at temperature of 250. The higher the replacement of cement by rice husk ash will weaken the compressive strength of mortar, but spalling and cracking doesn't happen on every OPC cement replacement by RHA.Keywords: Cracking, high temperature, OPC, rice husk ash, spalling,
Aktivasi Green Coke Menjadi Karbon Aktif Menggunakan KOH Sebagai Aktivating Reagent Rahmawati Rahmawati; Irdoni HS; Bahruddin Bahruddin
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

The activated carbon is one of adsorbent which often used in absorption process. This is because the activated carbon has better absorptive capacity of adsorption and surface areathan other adsorbent. One of the potentially material that can be used as a raw material to be activated carbon is green coke because it has 87- 97% carbon content and 250-3000 m2/grsurface area. This research aims to determine the effect of mass comparison of KOH to green coke, and activation time to the characterization of activated carbon. The manufacture ofactivated carbon was carried out with chemical activation method which used KOH as activating reagents. The process was done by mixing the green coke and KOH with a mass ratio variation (1/1; 2/1; 3/1 b/b) and activation time (18, 20, 22 hours). The activatedcarbon was analyzed with proximate analysis (moisture, ash, volatile), activated carbon absorption of the methylene blue, the surface area of BET (Brunauer Emmett Teller) and analysis by using Design Expert v10.0.1. The mass comparison of KOH to green coke and activation time indicated a significant effect to all of responses. On the best condition process (KOH mass comparison to green coke is 3.414:1 and activation time 20 hours) was obtained the best response value for mass yield 85.9%,; water content 7.37%; ash content 3.22%; volatile substance content 6.8%; the absorption of activated carbon to the methylene blue is 137.15 mg/g and surface area is 25,33 m2/gr. The analysis result of surface area determine that KOH mass comparison to green coke and activation time has significant effect to the surface area, it is indicated by the pores which increasingly open and the enhancement of surface area before activationKeyword : activated carbon, chemical treatment, green coke
Degradasi Zat Warna Tekstil (Rhodamin B) Dengan Teknologi Aop (Advanced Oxidation Process) Metode Fotokatalitik Menggunakan Katalis Nanokomposit Znfe2o4/SBE Affananda Taufik; Zultiniar Zultiniar; Edy Saputra
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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Dyestuffs which the result of the textile industry are non-biodegradable organic compounds, can cause environmental pollution especially the aquatic environment. One alternative to processing textile waste is to use the photocatalytic. Photocatalytic is a process of combination of catalyst and light. This study aims to synthesize ZnFe2O4 / SBE catalysts with microwave methods and characterization, study the influence of process conditions in degradation and determine the best process conditions in dye degradation. Nanocomposites from ZnFe2O4 / SBE have been successfully synthesized using the microwave method. The catalyst synthesis process is carried out by microwave for 20 minutes and followed by calcination at 500oC for 5 hours. Photocatalytic degradation lasted 120 minutes, stirring speed 350 rpm and volume of 250 ml solution. The variation of ZnFe2O4 / SBE concentration was 1.5 g / L, 1 g / L, 0.5 g / L and 0.25 g / L and the showed the maximum results from the best photocatalytic process obtained from variations in the catalyst concentration of 1.5 g / LKeywords: photocatalytic, rhodamine b, znfe2o4/sbe
Pengaruh Ukuran Partikel Pada Pembuatan Briket Arang Lumpur IPAL Pabrik Sawit Dan Cangkang Biji Karet Mutia Khairunnisa; Elvi Yenie; Ivnaini Andesgur
Jurnal Online Mahasiswa (JOM) Bidang Teknik dan Sains Vol 6 (2019): Edisi 2 Juli s/d Desember 2019
Publisher : Jurnal Online Mahasiswa (JOM) Bidang Teknik dan Sains

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The utilization of fossil energy sources overload resulted in the availability of energy sources depleting and should be offset by the provision of alternative energy renewable, abundant amount, and the cost price is so affordable by the public, one of which is briquette. Palm oil mill sludge is one of the wastes at the palm oil processing. Palm oil smill sludge with the addition of rubber seed shells can be used as raw material for making briquettes through the carbonization process. This study aims to study the effect of particle size variations on the proximate analysis of the briquettes produced. Variations of particle size were 60, 80, and 100 mesh with the composition of palm oil mill sludge and rubber seed shells were 60%:40%. The results showed that the best briquettes were obtained at 100 mesh particle size with 4% moisture content, 4.5% ash content, 9.3% volatile matter and 82.2% fixed carbon.Keywords: briquettes, carbonization, rubber seed shell, palm oil mill sludge

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