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INDONESIA
Jurnal Online Mahasiswa (JOM) Bidang Teknik dan Sains
Published by Universitas Riau
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Core Subject : Engineering,
Engineering
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Articles 3,145 Documents
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Respon Struktur Portal Baja Akibat Beban Gempa Dengan Analisis Riwayat Waktu Nonlinier Syauqi, Muhammad; Suryanita, Reni; Djauhari, Zulfikar
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

Earthquakes are dynamic loads that greatly affect the state of the building structure. If the strength of the building can not withstand the dynamic load, then the building will be damaged even will collapse. The purpose of this study was to identify the structural response in the Indonesian quake region by using nonlinear dynamic analysis. Structural modeling using Banda Aceh, Bengkulu and Pekanbaru earthquake locations with medium soil condition on a 10-storey building made of steel with a constant inter-floor height of 4 m. Time history analysis in earthquake plan using 3 accelerated earthquake accelerator, namely: Kobe, Imperial Valley and Chichi earthquake. Each earthquake accelerator was given three treatments: 1). The earthquake scale is decreased by 50% (0.5 g), 2). Normal earthquake scale (1 g), and 3). The scale of the earthquake is increased by 200% (2 g). The analysis results show that the displacement, velocity, and acceleration of earthquake-load structures in each region are directly proportional to the increasing or decreasing of the earthquake-scale in buildings that do not occur in plastic joints.Keywords : steel portal structure, response, displacement, velocity, acceleration, time history analysis
Pembuatan Biodiesel Dari Minyak Biji Kapuk (Ceiba Pentandra) Dengan Katalis Lempung Teraktivasi; Pengaruh Waktu Reaksi Terhadap Yield Biodiesel Nurlis Nurlis; Syaiful Bahri; Edy Saputra
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

Research on production biodiesel from kapok seed oil (ceiba pentandra) using an activated clay catalyst has been performed. It aimed to determine the effect of an activated clay catalyst on producing biodiesel, its quality and to study the effect of reaction time. Clay catalyst was activated by H2SO4 0.47%, 0.62%, 0.78% and NaOH with a concentration of 0.33%, 0.44%, 0.66%. Esterification with methanol in the ratio 1:12 with the addition of H2SO4 as much as 1% of the weight of oil. The next transesterification reaction, the kapok seed oil is reacted with methanol in the ratio of 1: 9 with the acids and bases activated clay catalyst. The reaction temperature of 60 °C, various of reaction time 1 hour, 1.5 hours and 2 hours. The results showed that the use of an activated clay catalyst H2SO4 0.78%, the reaction time of 1.5 hours to produce the highest yield 92.18%. Physical characteristics of biodiesel were obtained density 869 kg/m3, kinematic viscosity of 2.67 cSt, the acid number of 0.45 mg KOH/g sample and the flash point of 209oC. From the results was obtained biodiesel produced in compliance with the SNI 7182: 2015.Keywords: activation, biodiesel, clay, kapok seed oil, transesterification
Deteksi Kebocoran Dan Sumbatan Pada Pipa Menggunakan Sinyal Suara Tengku Hamzir Muhardillah Yahya; Feblil Huda
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

The pipeline system leads an important role and ubiquitous feature of modern society which is used as one of the high integrity fluid transport function, but has a major problem such as leakage and blockage. Detection methods are typically performed using ultrasonic pressure and wave differences at a relatively high price. The research method used is detection by using sound signal. Sound signal method is smart structural health monitoring that can detect problems quickly and precisely which has the advantage that is cheaper cost. Sound signals are given for leakage, blockage, and joint damage to water and waterless conditions of different sizes and positions. The sound signal data is processed by fast fourier transform and wavelet transform methods. From the test obtained the result increase amount of damage given the greater the amplitude generated with the largest estimation error in full blockage condition with water of 5%.Keywords : Sound signal, leakage, blockage, fast fourier transform, wavelet transform
Uji Kinerja Motor Bakar Empat Langkah Satu Silinder Dengan Variasi Tinggi Bukaan Katup Pada Sudut Pengapian Sepuluh Derajat Sebelum TMA Dengan Bahan Bakar Pertamax Plus Jhoni Oberton; Azridjal Aziz
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

Factors that also affect performance and reduce exhaust gas emissions are fuel quality combustion in the combustion chamber. One of the parameters that influence is the amount of supply of combustion air into the combustion chamber. Where this supply is governed by the camshaft mechanism through open-close of the intake valve and the exhaust valve. The purpose of this study is to determine the effect of reduction of lift camshaft on engine performance. The investigation was conducted on a Yamaha jupiter Z1 single-cylinder, four-stroke, spark ignition engine. The experiments were performed by varying the reduction of lift camshaft, with camshaft standard (CAM STD), camshaft condition 1 with reduction of lift camshaft 0.5 mm (CAM 1), camshaft condition 2 with reduction of lift camshaft 0.10 mm (CAM 2) and camshaft condition 3 with reduction of lift camshaft 0.15 mm (CAM 3) and speed of the engine (2000 rpm, 3000 rpm and 4000 rpm). As a result, the maximum effective braking power was on CAM STD, at the engine speed of 3000 rpm that was 535.072 Watt, minimum SFC (Specific Fuel Consumption) was on CAM 2, at the engine speed 3000 rpm that was 1.54 x 10-7 kg/J and the thermal of maximum braking efficiency was on the CAM 2, at the engine speed of 3000 rpm equal to 14.129%.Keywords: Performance, Internal Combustion Engine, Camshaft
Biodiesel Dari Biji Buta-Buta (Hura Crepitans Linn) Dengan Katalis Ni/Nza Tresia Monika Natalia Sinaga; Syaiful Bahri; Edy Saputra
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

Indonesia is one of the oil producing country in the world but is still importing fuel oil (BBM) for meet the fuel needs in various sectors. Therefore, an alternative is needed to meet these needs. Among them is to produce biodiesel from vegetable oil feedstock. One type of vegetable oil that can be used as a raw material is Hura crepitans Linn. This research is aimed to produce biodiesel from Hura crepitans Linn seed oil, to study effect of the metal content in the catalyst of Ni/NZA to biodiesel produced and to determine the best conditions of process of biodiesel and then characteristics of biodiesel produced. The transesterification process was done at a temperature of 60oC, the weight of oil 50 grams, the catalyst 1%-weight of oil, reaction time variation of 1, 1.5 and 2 hour and mole ratio of oil to methanol 1: 6, 1: 9, 1:12 and catalyst NZA of 0% and 2%. The highest biodiesel result gives at experiment of 2% metal content oil to methanol mole ratio of 1: 9, for 1.5 hours i.e. 85.8%. Characterization of physical properties of biodiesel obtained, density of 0.885 gram/ml, 4.29 cSt kinematic viscosity, acid number 0.49 mg KOH / g sample, and the flash point 180oC respectively. Chemical components of biodiesel analysed with Gas Chromatography-Mass Spectroscopy (GC-MS) produce methyl linolelaidate 72,64%, methyl Oleic 19,08%, methyl stearate 2,2%, methyl palmitate 2,11% and methyl octadec-11-enoic 0,66% respectively. Keywords : biodiesel, catalyst Ni/NZA, Hura crepitans Linn, transesterification
Manajemen Susut PT. PLN (Persero) Rayon Siak Dengan Menggunakan Metode Perhitungan Rumus Susut Jogja Ainur Rohmah; Edy Ervianto
Jurnal Online Mahasiswa (JOM) Bidang Teknik dan Sains Vol 4, No 2 (2017): Wisuda Oktober Tahun 2017
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As solely company to manages electricity in Indonesia PT. PLN (Persero) often suffer from business loss due to the following reason, i.e. vulnerability power, unsecure risk, improper finance cost, unknown billing target for street’s lighting. To anticipate those problem PLN has conducted best practice in term of losses management which known by Rumus Susut Jogja. This paper proposed this method for PT. PLN (Persero) Rayon Siak to overcome above mentioned problems. Rumus Susut Jogja method has several mechanisms to perform analysis. Firstly, collect the data assets, production’s data, and selling’s data according to the unit’s condition. Then, the process continue by Rumus Susut Jogja to get each losses value. The result of Rumus Susut Jogja was presented in Chart Dupont which divide losses into two part, i.e. technical losses and non-technical losses, so we can evaluate and analyst the losses. Based on the data calculation, PLN Rayon Siak on February 2016 shows the high range losses still remain with 11,59% total losses. This value is approaching the value that showed by [Khord, H.M., et.al.,2002]. Overalls, Rumus Susut Jogja has proven for PLN Rayon Siak able to obtained the exact value of total losses line distribution and successfully to achieve the target into 7,35% by December 2016.Keywords: losses, calculation method, rumus susut jogja
Pembuatan Microcarrier Berbahan Baku Hidroksiapatit Menggunakan Metode Protein Foaming-Starch Consolidation pertiwi, Megawati Dwi; Fadli, Ahmad; Drastinawati, Drastinawati
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

Macroporoous microcarrier is one of tissue engineering technology that consist of support matrix and can be used as a cell culture medium in bioreactor. Protein foaming-starch consolidation method is choosed for manufacturing porous hydroxyapatite with egg yolk as a pore-forming agent. The purpose of this study was to determined the effect of yolk addition, sintering temperature, and drying temperature on the physical, chemical and mechanical properties of porous hydroxyapatite made by protein foaming-starch consolidation method. This research was begun with mixing the hydroxyapatite powder, starch, Darvan 821A and yolk. S;urry was stirred mechanically in speed of 150 rpm for 3 hours. Slurry was poured in mold and heated in oven with the temperature of 180ºC for an hour. Then sample was released from mold and burnt at 600ºC ended by sintering at 1250ºC for an hour. The experimental resulted porous hydroxyapatite with average pore size differs from 13.7-17.9 μm, degree of porosity 59.3-63.6 % and compressive strength 5.17-8.2 MPa.Keywords: hydroxyapatite, microcarrier, protein foaming-starch consolidation
Pengaruh Diameter Pelat Helical Terhadap Kapasitas Daya Dukung Lateral Pondasi Helical Pada Tanah Gambut Suryadi Ramadhan; Ferry Fatnanta; Muhardi Muhardi
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

Application of helical pile to support structures constructed on peat is still a new method. Research is needed to discover ability of helical fondation replace wood pile. There were 6 different helical piles, wood pile, and plain pile embedded in peat. This research aimed to determined the behavior from effect of diameter variations helical plate to lateral bearing capacity of helical pile on peat soil. The distribution process lateraly load based on constant rate of penetration procedure with eccentricity 500 mm and 300 mm. The calculation of lateral bearing capacity theoretically using the method of Brinch Hansen (1961) and Methods Broms (1964). Interpretation method used are standard lateral failure structure. The addition diameter helical plate will Improved lateral bearing an average of 25 N. Reduction of the eccentricity value by 20 cm will increased the lateral bearing capacity average of 39 N. The results of trial and error in determined the cu correlation value is 0.05cu.Keywords: Helical Pile, Plate Diameter, Peat, Lateral bearing Capacity, Eccentricity, Wood Pile.
Studi Neraca Air Di Pulau Rupat Kristin, Vyronika; Rinaldi, Rinaldi; Fauzi, Manyuk
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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Rupat Island is one of the island that surrounded by oceans and the unavaiability of water supply company cause the people of the island to rely on rain water to get clean water. Population growth, land use change, the behavior of hydrology and building infrastructure water inadequate affect the water availability relatively constant, which in the end feared will cause imbalance between the needs and availability. So, we need a study of water balance with the aim to analyze the needs, availability and water balance at Rupat Island. Analysis of the availability of water is conducted by rainfall data of half monthly period from 2006 to 2015 using National Rural Electric Cooperative Association (NRECA) and F.J. Mock with discharge comparison is from Automatic Water Level Recorder (AWLR) Pantai Cermin for calibration. From this calibration will be compared with finding the Root Mean Square Error (RMSE) value and obtained the better method is NRECA. The needs was calculated until 2035 with assuming all grades needs except domestic demand that is considered a constant. Analysis of water balance is based on the probability of 80%, 20% and average discharge from availability. The final result of this research showed that availability for Qinflow 80% condition going on deficit for particular months. However, for the others conditions going on excess water throughout the year and it will still be able to fulfill the needs of water until 2035 with assuming no significant changes of catchment area.Keywords: Water Balance, NRECA, F.J. Mock.
Taman Burung Dengan Pendekatan Arsitektur Postmodern Metafora Muhammad Hafiz I. S.; Ratna Amanati; Mira Dharma S
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

Bird is one of animals that comes in various species and spreads in almost every part of Earth’s surface. However, certain specieses of birds is on the verge of extinction. Nature destruction andpoaching are the causes of the extinction. In Indonesia, there are 131 kinds of birds whose existence is endangered. Therefore, a medium to acomodate endangered birds is needed and it’s called as Bird Park. The Bird Park is designed using Metaphoric Postmodern Architecture approach. The purpose of using Metaphoric Postmodern Architecture is to create a replica of bird’s real habitat. Postmodern Metaphoric Architecture is a design theory that takes the shape and characteristics of an object andapplied it to the building’s appearance. Through this Postmodern Metaphoric theme, we are able to get the concept of ‘Unity in Diversity’. This is to combine and connect the functions of the Bird Park as means of recreation, education, and conservation. Through this Postmodern Metaphoric Architecture theme and the concept of ‘Unity in Diversity’, we are able to get the shapes andcharacteristics of birds that can be applied on the mass arrangement and façade pattern of the Bird Park.Keywords: Extinction, Bird Park, Methaporic Postmodern Architecture

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