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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
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Sensitivitas Hidrograf Satuan Di Sungai Batang Lubuh Dengan Menggunakan Hidrograf Satuan Sintetik Clark Dalam HEC-HMS Isdianto, Isdianto; Handayani, Yohanna Lilis; Sujatmoko, Bambang
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 method transforming of rain in HEC-HMS when applied on a DAS, it will show a different response in accordance with the selected method. Therefore it needs to known about the best transforming for sub DAS Rokan Kanan. Process on HEC-HMS program among others input data and calibration. Calibration process has six method Recession – Ratio to Peak, Clark Unit Hidrograph Time Of Concentration, Recession – Initial Discharge, Recession – Recession Constant, Clark Unit Hidrograph – Storage Coefficient, and Initial and Constan-Constan Rate. Objective function which used are Peak-Weighted RMS Error, Percent Error Peak, Percent Error Volume. The result of calibration Peak-Weighted RMS Error method=58.48. Percent Error Peak method = 1.11 and Percent Error Volume method= 0.00. Sensitivity of changes peak discharge and changes volume at parameter Initial and Constan-Constan Rate and Recession-Recession Constant with each changes presentation -76,15% and 77,70%.Keywords: hydrological modeling, unit hidrograph, sensitivity, hec-hms
Kinetika Reaksi Deproteinasi Limbah Udang Ebi Pada Isolasi Kitin Wijaya, Ridho; Fadli, Ahmad; Amri, Idral
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

Chitin is a biopolymer and can be synthesized from ebi shrimp waste through deproteination and demineralization processes. The purpose of this study was to determine the kinetics of deproteination reaction in chitin isolate with variable reaction temperature and stirring rate. The study began by reacting shrimp waste powder with 3.5% NaOH solution using a ratio of 1:10 at 75 ° C, 85 ° C and 95 ° C and 200 stirring speeds, and 250 rpm in a glass beaker equipped with stirrer. Samples were taken every 10, 20, 30, 50, 70, 90, 110 and 120 minutes as much as 40 mL, then washed until the pH was neutral and the sample filtered. The shrimp powder produced was analyzed using titration method of formol to know the protein content contained in the sample. The results showed that the reaction kinetics follows the pseudo first order equation. The higher the temperature and the speed of stirring given to the deproteination process the greater the concentration produced. The reaction speed constant at 75°C, 85°C and 95°C with 200 rpm stirring speed was obtained at k = 0.0098 min-1 to 0.0217 min-1. While at 250 rpm stirring speed k = 0.0113 min-1 to 0.0255 min-1. The optimal condition available in this study is 95oC with 250 rpm stirring speed so that it produces protein from 14.08% to 0.87%.Key words : Deproteination, chitin, reaction kinetics, ebi shrimp waste, FTIR analysis.
Perancangan Dan Pembuatan Sistem Kontrol Penggerak Torch Potong Las Oxy-Acetylene Berulir Berbasis Mikrokontroler Arduino Uno Handoko, Yulli; Herisiswanto, Herisiswanto; Syafri, Syafri
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

Currently, the most common method of cutting steel is cutting with oxygen gas. Because the cutting method with manual cutting produces poor results and complicated processes. This plate cutting tool is made to facilitate the work especially in the field of construction. The used research method is based on the workprinciple of CNC 2 axis machine, because it is able to move in the direction of X and Y axis on the work plane, also has a hight accurancy and precision. This plate cutting tool use 3 Softwares, i.e Universal G-Code Sender as a controller, QCAD as a workpiece design and DXF2G-CODE as a code exporter. The manufacture ofmicrocontroller-based plate cutting tool results an easier plate cutting process, because the operator have to input the data according to the necessary only. From the X and Y axis movement and plate cutting velocity testing, the result data has equal magnitude between the program, simulation and actual condition.Key Words : Oxy-Cutting, Microcontroller, Arduino UNO.
Analisa Sistem Proteksi Petir Pada Sutt 150 KV Menggunakan Software ATP Sano, Havel Alindo; Murdiya, Fri
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

Electrical energy is very important today. The power company distributes the electric energy through the 150 kV overhead lines. The transmission line is a major part of the electrical energy distribution process. Overhead lines are supported by high towers, therefore the overhead lines and towers prone to lightning. The lightning current leads to the increasing voltage on the overhead lines. Surge arrester is a protective device used to protect overhead lines from lightning current. The analysis of the performance of the surge arrester against the lightning impulse requires the investigation in the placement of the surge arrester and the number of surge arresters installed. This study aims todetermine the magnitude of the voltage caused by lightning strikes by varying the location of the surge arrester on the overhead lines. This study was conducted by selecting a lightning strike at apeak voltage of 10 MV on a transmission tower using ATP software. This study indicated that the installation of surge arresters on the overhead lines for each tower leads to droping voltage verywell. The result of study shows that the best result was to install the arresters on each tower phase by decreasing the voltage at 1st tower by 0,4679 MV (92,81%), 2nd tower 0,5674 MV (92,64%), 3rd tower 1,2248 MV (85,79%), 4th tower 10 MV (0%), 5th tower 1,2322 MV (86,09%) and 6th tower 0,6219 MV (92,53%).Keywords : Lightning strikes, surge arrester, peak voltage, placement of surge arrester , voltage drop
Karakteristik Nilai Kuat Tekan Bebas Stabilisasi Semen Tanah CL-ML Terhadap Siklus Pembahasan Pengeringan Pratama, Dodi; Fatnanta, Ferry; Muhardi, Muhardi
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 soil that classified as CL-ML soil have range of plasticity index around 4% s/d 7%, and liquid limit with range 12% s/d 30% according to the Casagrande Plasticity graph, this soil condition is very susceptible to the addition of water content so that cause soil at winter season being easily melted as a porridge and cracked as of existed at retrieval specimen location at dry season. This retrieval specimen location located at Government Office of Pekanbaru Area, Indonesia. This situation being problem if there is construction work above it such as road construction. Soil restoration is necessary for stabilizing soil. In this case used stabilizing soil chemically. Ihis research focuses to cycle process of wet-dry toward soil mechanical characterize effect that stabilized by cement. This research result showed that value of unconfined compressive strength toward wet-dry cycle have different values. Cement addition to CL-ML soil get very significant increasing of unconfined compressive strength. Highest increasing unconfined compressive strength is on 7 days curing, 3x 24 hours, drying second cycle about 1.636,51 kPa, this thing caused by cement that contained in 7 days cured soil reacted and turned into paste dan eventually cement that contained in soil start hardened, so that is able to increasing unconfined compressive strength value high enough.Keywords: Wet-dry cycle, UCS, CL-ML, cement stabilization.

Page 315 of 315 | Total Record : 3145

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