Adhy Prayitno, Adhy
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Published : 6 Documents
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Improvement of peat soil capillary density A comprehensive approach to solve fire disaster in peatland area

Indonesian Journal of Environmental Science and Technology Vol 1, No 1 (2014)
Publisher : Universitas Riau

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Abstract

In the last seventeen years, Riau province has suffered from fire disaster and smog despite several effortstaken by the government. These problems have brought damaging impact to the peatland forest where fireis likely to occur especially during dry season. The continuation of fire disaster in peatland has caused theorganic compound within peat soil to decompose and oxidize. The physical characteristics of the peatland arealso changing, for instance: its ability to restore water. In dry season peat soil is extremely dry due to the depletionof groundwater. This has caused the peatsoil release methane gas which will affect the soil porosity.This condition makes peatland prone to fire. This paper suggests that the improvement of capilary density of thepeat soil as a preventive way to stop the fire incident. The method is carried out by replanting endogeneousplants or vegetation on the peatland. A tube of 5 11m diameter is capable of rising the water up to 2.96 m fromthe surface of table water (groundwater level). It is aproximately equal to radius of xylem tube within plants.The height of a column of water in a single tube with a circular cross-section radius r is driven by the balanceof two forces. They are force of gravity and adhesive florce between the walls of the tube.Key word: capillary density, moisture content, wetting, replanting, ground waterlevel

Studi Kecermatan Alat Ukur Roundness Tester Machine Produksi Laboratorium Jurusan Teknik Mesin Universitas Riau Dengan Metode Helix

Jurnal Online Mahasiswa (JOM) Bidang Teknik dan Sains Vol 2, No 2 (2015): Wisuda Oktober Tahun 2015
Publisher : Jurnal Online Mahasiswa (JOM) Bidang Teknik dan Sains

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Abstract

measuring clock or Dial indicators is a comperator device. typically used in industrial activities in particular at product deviation, because it has good accuracy. Precision and accuracy is the closeness to the true value, can be defined as the closeness (cloness) between the values read from the measuring instrument to the true value. The use of measuring devices which have high accuracy and good will generate accurate measurement data and vice versa use measuring devices that are not good or accurate, then the results obtained are not accurate. This study aims to determine the accuracy of measuring instruments by varying the motor speed to the drive dial indicator with helix methods, and large roundness deviation (Roundness Tester Machine). The result showed that the roundness deviation for each speed roundness of the lowest value and the highest at speed 0,040 m / s is: MCC = 0.008 mm to 0.124 mm, MZC = 0.008 mm to 0.122 mm, MIC = 0.006 mm to 0.029 mm, and LSC = 0.005 to 0.085 mm. Then to the speed of 0.046 m / s roundness deviation obtained MCC = 0.007 mm to 0,186 mm, MZC = 0.005 mm to 127 mm, MIC = 0.005 mm to 0.121 mm, LSC = 0.005 mm to 0,113 mm, while the speed of 0.071 m / s roundness deviation obtained for MCC = 0.094 mm to 0.611 mm, MZC = 0.047 mm to 0,153 mm, MIC = 0,050 mm to 0.107 mm, LSC = 0.042 mm to 0.111 mm, the speed of 0,040 m / s is closer to the data than the speed of other mandrel, the effect of instrument error is evident from the table 4:20 on four very large positions are not accurate Measure tool is e (mm) = 0.0830 or e (%) = 42.17, and the roundness deviation at speed of 0,040 m/s by the largest outer circle the minimum is 0.124 mm, the inner circle is 0.122 mm maximum, the minimum of a circle area is 0.122, and for the least squares circle is 0.042 mm. The fourth circle of reference is used, then the circle of least squares best used to determine the roundness deviation results in accordance recommended ISO.          Keywords : deviation, helix method, Roundness Tester Machine, speed variation.

Rancang Bangun Rangka Sun Tracking Pada Panel Surya Dinamik

Jurnal Online Mahasiswa (JOM) Bidang Teknik dan Sains Vol 6 (2019): Edisi 1 Januari s/d Juni 2019
Publisher : Jurnal Online Mahasiswa (JOM) Bidang Teknik dan Sains

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Abstract

This study aims to design a Sun Tracking frame in dynamic solar panels. The methodology of this research has 4 main steps: (1) Literature Study, (2) Design Concepts, (3) Concept Selection, (4) Frame Making. in this study a Sun Tracking machine designed for solar cells was designed to follow the movement of the sun. The design stages consist of needs analysis, preparation of product technical specifications, design of product concepts to produce alternative product concepts which are then selected concepts to be made. From the form of the concept that will be made, static analysis is carried out on the mechanical components of the Sun Tracking engine. Static analysis is done by means of manual calculation and elemental analysis. Based on the results of the static analysis, the results of the stresses were 8.381 MPa on stem 1, 8.769 MPa on rod 2, 0.5378 MPa on rod 3 and 0.6448 MPa on rod 4. Deformation that occurred was 0.02783 mm at stem 1, 0.03107 mm on stem 2, 0.0003228 mm on stem 3 and 0.0002346 mm on stem 4. Keywords: Sun Tracking, solar cell

Pengaplikasian Pengolah Data Pengukuran Kebulatan (Roundness) Pada Alat Ukur (Roundness Tester Machine) Di Laboratorium Pengukuran Teknik Mesin Universitas Riau

Jurnal Online Mahasiswa (JOM) Bidang Teknik dan Sains Vol 6 (2019): Edisi 1 Januari s/d Juni 2019
Publisher : Jurnal Online Mahasiswa (JOM) Bidang Teknik dan Sains

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Abstract

Measuring clock or dial is a comparison device usually used in industrial activities, especially in production. To make measurements at this time must be supported by technology that can facilitate operators when using it and when analyzing measurement results. Involving the programme and microcontroller are a solution to developing in roundness measurement, and then the results can be more accurate or thorough between the readable values read from the measuring instrument with the actual value of varying the amount of data. Roundness application is a program that can input measurement data automatically and can do calculations directly. Then, it can display a reference circle, a table that calculates the values of X, Y, R, X’, Y’, R’, Roundness Deviation, Run out Concentricity or a shift in the center point and also the center point shift or Theta. In measuring roundness, the test object is used the Standard Mandrel which has been certified by PT. Global Quality Indonesia, by determining three points or positions, namely in the first position the amount of data is 180, in the second position the amount of data is 90 and in the third position the amount of data is 60 with a rotating speed of 15 mm/s. The results of the reference circle can be seen in each calculation in each position, in the second position the roundness deviation values are approaching of the Mandrel. Key word : Roundness application, position, measurement, data variation

Electric Power Optimizing Of Solar Panel SystemThrough Solar Tracking Implementation; A Case Study in Pekanbaru

INSIST Vol 2, No 2 (2017)
Publisher : Universitas Lampung

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Abstract

Observations and measurements have been conducted towards a solar panel electric power output that is utilized by a solar tracking system. The electrical power output depends on the position of the sun and time and the direction of the panel surface against the angle of the incident light. For power optimization, the solar panel surface should always be directed perpendicular to the direction of the sunlight falling to the surface of the panel. The application of the solar tracking system controlled by a micro controller gives the expected results. The electrical power output of a static solar panel mounted on a fixed position becomes the benchmark of the output electric power value in this study. The measurement results of the electric power output of the solar panel with sun tracking system shows a significant increase in sunny weather conditions.The average increase of that is about 57.3%.Keywords: LDR, micro controller, optimal power output, performance improvment, sun tracking,

Pembuatan Sistem Kendali Pelacak Surya Otomatis Pada PLTS

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

Solar Electricity Generation (SEG) is an environmental freiandly technology takes advantage from phototovoltaic which is capable of converting solar energy to electricity energy. The Potensial of promoting SEG in Indonesia is very promizing in view of Indonesia's geographical location on the equator.The SEG with an automatic solar tracking system consist of LDR Sensor,Ardunio Uno, Servo Motor, Stepper Motor.Work operating procedur of the automatic solar tracking on SEG is begun from LDR sensor detection to solar position. Based upon LDR, data,Arduino (microcontroller)actived stepper motor to drive the photovoltaic panels to be always perpendicullar to the solar radiation during the operation. A such SEG system is considered able to give optimum energy output since the photovoltaic gets maximum radiant energy from the sun.The use of an automatic solar position control system on solar panels can increase panel performance and increase electrical power with an average output reaching almost 75% more than static solar panels.Keywords : SEG,Photovoltaic,Solar panels