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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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Kecepatan Aliran Air Tanah Pada Sumur Pantau Menggunakan Paper Disc Velocimeter Roza Wahyuni; Rinaldi Rinaldi; Sigit Sutikno
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

Paper disc velocimeter is a device used as a gauge groundwater flow movement which includes the velocity and direction of water flow in media. Paper disc velocimeter is a measurement of groundwater flow originating from Japan, therefore for use in Indonesia there are several obstacles such as the type of paper and ink used that are not available in Indonesia, therefore replacing paper and local ink is easily obtained. The aim of this research is to test a large number of local papers in Pekanbaru to be applied to groundwater flow measuring devices using local papers materials, replacement is carried out by replacing paper types with paper in Pekanbaru, paper used totaling 3 types of paper characteristics, testing is done by conducting measurement using a velocimeter paper disc inserted into the monitoring well with a predetermined time. The test results are the equation used to find the groundwater flow velocity on the paper disc. Paper one has the characteristics of fine fibers, having velocity ranging ffrom 0 to 0,341 cm/minute.Keyword: Paper disc velocimeter, groundwater, material local
Pengaruh Variasi Penambahan Naoh Pada Kuat Tekan Mortar Geopolimer Abu Terbang Dengan Opc Sebagai Tambahan Ferisma Ratu Giri; Monita Olivia; Iskandar Romey Sitompul
Jurnal Online Mahasiswa (JOM) Bidang Teknik dan Sains Vol 7 (2020): Edisi 1 Januari s/d Juni 2020
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This study investigates the effect of NaOH molarity on geopolymer mortar with Ordinary Portland Cement in addition to geopolymer mortar. The intent of using Ordinary Portland Cement is to produces hybrid geopolymer concrete which can harden without high temperatures. Mortar was treated at room temperature (20-25 0C), then testing after mortars aged 7 and 28 days. The variation of molarity of NaOH used was 10 M, 12 M, and 14 M, while the ratio of silicate modulus, Ms ( Na2SiO3 / NaOH) and the percentage of OPC added to the mixture were 2,5 and 15% of the weight of fly ash, respectively compressive test was conducted to the specimens. The results showed that mortar with 12M NaOH had a compressive strength of 15,47 MPa, while the compressive strength of specimens with 8M, 10M, 14M and 16M were 10,93 MPa, 14 MPa, 13,20 MPa and 10,67 MPa, respectively. The optimal compressive strength is obtained on addition 12M NaOH. Keywords: Compressive strength testing, geopolymer, hybrid geopolymer, mortar, NaOH molarity, silicate modulus ratio, ordinary portland cement..
PERBANDINGAN RENCANA ANGGARAN BIAYA PADA PERHITUNGAN TEBAL LAPIS TAMBAH (OVERLAY) DENGAN METODE PD T-05-2005-B DAN ASPHALT INSTITUTE MS-17 J.M, Satria Agung Mulia; Iriana, Rian Trikomara; Shalahuddin, M
Jurnal Online Mahasiswa (JOM) Bidang Teknik dan Sains Vol 4, No 1 (2017): Wisuda Februari Tahun 2017
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The purpose of this study is to analyze the budget plan obtained from the overlay calculation using Pd T-05-2005-B and the Asphalt Institute MS-17. Studies were conducted on roadsections of Jurong-Mandau in Bengkalis, regency using design life of 5 years and 10 years with traffic development rate 5.165%, which is projected from the linear regression. Theresults of this study with Pd T-05-2005-B methods design life of 5 years, segment 1 sta 00+000 s/d 00+500 by 7.770 cm, segment 3 sta 02+500 s/d 03+000 by 8.467 cm with a total cost of Rp. 2,873,439,898.00 and a design life of 10 years obtained overlay, segment 1 sta 00+000 s/d 00 + 500 by 10.624 cm, segment 3 sta 02+500 s/d 03+000 by 11.201 cm, the segment 9 sta 06+000 s/d 06+500 by 3,810 cm with a total cost of Rp. 4,003,870,931.00.And then with Asphalt Institute MS-17 method design life of 5-year and 10 years does not require an overlay and budget plan calculations, because from the calculations obtained overlay value is 0. Based on the results of the study indicate that working on overlay design life of 10 years is more economis and effective than the design life of 5 years.Keywords: Overlay, Budget Plan, Design Life, Pd T-05-2005-B Method, Asphalt Institute MS-17 Method.
ANALISA DAN DESAIN MAXIMUM POWER POINT TRACKING UNTUK GENERATOR INDUKSI PADA APLIKASI SEPEDA LISTRIK Hasan, Anshari; Hamzah, Amir
Jurnal Online Mahasiswa (JOM) Bidang Teknik dan Sains Vol 4, No 2 (2017): Wisuda Oktober Tahun 2017
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Abstract

Currently, vehicle transportation is becoming a very important tool in helping humans. Therefore an increase in the volume of the vehicle is very high every year. With so many current vehicles could damage the air cleaner in nature, caused by the combustion of residual Fuel (Fuel oil) the vehicles that emit fumes. Therefore it needs an alternative environment-friendly vehicles with electric bicycles. Electric vehicles currently using permanent magnet motors as their motive. On this research the drivers of electric vehicles use the induction generator who has the advantages i.e. a constant round of and excitation does not need another motor as a driving force. This vehicle is also installed on a system power savings, power saving methods is improved significantly. One of them is MPPT (Maximum Power Point Tracking) used in induction generators. MPPT design is modelled using Matlab/Simulink software. The Matlab simulation has manage to obtain 55.04 volts of MPPT. While the generator output voltage without using the MPPT is amount of 40.84 volts. By using perturb and observe algorithm, it is possible to search the optimum power of generator.Keywords : Generator, Maximum Power Point Tracking (MPPT), Perturb and Observe, Boost Converter, Matlab/ Simulink.
Rancang Bangun Aplikasi Sistem Pakar Diagnosa Hama Dan Penyakit Pada Tanaman Cabai Berbasis Web Afrianti, Dedeh Kurnia; Marpaung, Noveri Lysbetti
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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Chili plant is a plant that is widely cultivated by the Farmers in Indonesia. However, chili plant is a plant susceptible to attack of Plant Disturbing Organisms (pests and diseases). Pest and disease attack causes decrease productivity and harvest fail. To overcome this, proper control is required. Therefore, an expert in the field is required. This research designs and builds an expert system application using Bayes Theorema probability method. This expert system is implemented in the website, so it can be easily acceessed by user. This system diagnoses attacks from the selected symptoms, then the system calculates the probability of each symptom, and displays the result of the attack name and the percentage of the outbreak of the attack. The result of this research is the expert system application can be used to diagnose pest and disease chili plant and help the chili Farmers in finding the solutions to problems about the pests and diseases of chili plants.Keywords : expert system, chili plants, pest and disease, Bayes Theorema.
Analisis Kuat Lentur Sistem Lantai Curved Tile Semi Pracetak Mustainul Murtadho; Ismeddiyanto Ismeddiyanto; Enno Yuniarko
Jurnal Online Mahasiswa (JOM) Bidang Teknik dan Sains Vol 4, No 1 (2017): Wisuda Februari Tahun 2017
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Abstract

Semi-precast slab uses the combination of cast-in-place concrete and precast concrete. The use of conventional firmwirk to buid a building was not support for cinstraction method and it’s very expensive for constraction. Some advantages of precast system are related to its time, cost, predictability, reliability, productivity, health, safety, environment, coordination, innovation, reusability also relocability. The research aimed to analyse flexure behaviour of semi precast curved tile concrete slab using finite element software and its comparison to slices method. The analysis model was done in three element of structure, such as support beam, curved tile and cast in place concrete. The model was made in finite element analysis (FEA) program. Simulation done with two location of point load to get pure bending strength of slab. The result analysis has relation to the effect of load towards element bending, flexural moment and crack scheme on model. From the analysis maximum number of load (P) on semi precast slab system with slices method had higher number compared to finite element analysis (Abaqus). Slices method result had maximum number of Pmaks 56.99 kN, while finite element software method had maximum number of Pmaks 47.6 Kn. On semi precast concrete slab, the type of crack that occurred was flexural crack right on the area of highest number of flexural moment an show the crack pattern in the same direction of stirrups on the tensile side of slab.Keywords: slab, support beam, curved tile, semi-precast, cast-in-place, finite element analysis software.
Forming Process Product Trunk Profile C+/ Channel Plus On Cold Form Steel Machine Bayu Wiguna; Dodi Sofyan Arief; Muftil Badri
Jurnal Online Mahasiswa (JOM) Bidang Teknik dan Sains Vol 4, No 2 (2017): Wisuda Oktober Tahun 2017
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Research on the C+/ Channel Plus Product Forming Process on Cold Form Steel, is done because of the mildsteel with the new profile shape of C + (Channal Plus). This project purpose to determine the process of formingprofile C+ by considering the limits and tolerances allowed. Determining the forming process is an attempt madeto produce a Channal plus profile by considering the properties of the material, including the physicalproperties, mechanical properties and the formability of the profile material. An analytical approach is anattempt to avoid defects in products in a particular area from the result of forming. Each forming has a varietyof shapes, dimensions and functions. It takes the forming stages to produce light steel rod products ranging frommild steel raw material (coil) to the desired profile type. The result of the forming process is shown in the formof a flower diagram and is loaded in a 2 dimensional engineering drawing using Autodesk Inventor software.Key words: shape, dimension and function
Kesetimbangan Adsorpsi Zat Pewarna Rhodamine-B Menggunakan Fly Ash Sawit Sebagai Low-Cost Adsorbent Olsy, Fradilla; Saputra, Edy; Helwani, Zuchra
Jurnal Online Mahasiswa (JOM) Bidang Teknik dan Sains Vol 5 (2018): Edisi 1 Januari s/d Juni 2018
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Rhodamine B is one of the various toxic dye that contributes significantly to environmental pollution, because it is non-biodegradable, toxic and harmful to the environment. One effort to reduce the amount of rhodamine b is the adsorption process. One of the good adsorbent that can be use for adsorbtion process is palm oil fly ash. The purpose of this study to aim the effect of adsorption temperature, pH, and adsorbent mass. Knowing the optimum conditions for reducing the levels of dye in the water, as well as determine the adsorption equilibrium models rhodamine b using fly ash oil modified with 0,1M HCl as an adsorbent. Fly ash modification processes are done by mixing fly ash and HCl in the ratio 1:10 of 0,M HCl solution. The adsorption process is conducted by mixing fly ash 0.5; 1; 1,5 and 2g/L and pH solution of rhodamine b 2; 4; 6; 8 with temperature of 30; 35; 45oC and with various of rhodamine b’s initial solution 10, 20, 30 dan 40ppm. The optimum conditions for reducing the levels of rhodamine B in water is the adsorbent mass of 2g/L, temperature of 45°C and pH 8 at 10ppm concentration rhodamnine’s solution. Thermodynamic data such as ΔH, ΔG and ΔS were calculated. And the mechanism of rhodamine B dye adsorption by fly ash oil is suit well with Freundlich and Langmuir isotherm models.Keyword: Adsorption, Isothermal Adsorption, Palm Oil Fly ash, Rhodamine B,
ANALISIS POTENSI LIKUIFAKSI BERDASARKAN UJI PENETRASI STANDAR (SPT) (STUDI KASUS: PEMBANGUNAN FLY OVER JL. TUANKU TAMBUSAI – JL. SOEKARNO HATTA PERKANBARU) Gustika, Rani Ardeylina; Yusa, Muhamad; Fatnanta, Ferry
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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Indonesia is the country that located and surrounded by three great continental plates, where the earthquakes are usually happens. This kind of phenomenon has some direct impacts, which one of them is soil liquefaction. Soil liquefaction is a phase transition process from solid to liquid phase due to increasing the pore water pressure that caused by cyclic loading. This study aims to identify the susceptibility of materials to liquefaction phenomenon using the grain size distribution curve, to analyze the safety factor (FS) and liquefaction potential index (LPI). In order to do this study, one bore holes were observed by using standard penetration test (SPT) to evaluate the liquefaction potential phenomenon. The values taken for the peak ground acceleration (PGA) are 0,250 g, 0,288 g and 0,315 g while the values of 5,00, 6,45 and 7,90 were taken as moment magnitude (Mw). The results of this study shows that the materials are susceptible to liquefied based on grain size distributions. Furthermore, the location has a potential of liquefaction, and give values between 0,250-11,084 with a low to very high of LPI category.Keywords: soil liquefaction, susceptibility, safety factor, liquefaction potential index.
Karateristik Tegangan Tembus Gas Karbondioksida (CO2) Dan Nitrogen (N2) Dibawah Tegangan Tinggi AC Ginting, Rio Abraham; Murdiya, Fri
Jurnal Online Mahasiswa (JOM) Bidang Teknik dan Sains Vol 5 (2018): Edisi 2 Juli s/d Desember 2018
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Abstract

In the power system, there are many aspects that must be considered to operate the system such as conductor, insulator, and the electric power apparatuses. In this research, we investigated the carbon dioxide and nitrogen gases as gas insulation candidate in the circuit breaker. It is shown that the breakdown voltage of CO2 and N2 is proportional with the gap of sphere electrodes. In order to comparison between CO2, N2 gases and SF6 gas, the breakdown voltage of CO2 and N2 is lower than the SF6. However, if CO2 and N2 gas pressure is 4 bar, the breakdown voltage of CO2 and N2 will be similar or above SF6 at pressure 1 bar.Keywords: carbon dioxide, nitrogen, electrode, breakdown voltage, circuit breaker.

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