Article Per Year (5 Year)
p-Index From 2020 - 2025
1.383
P-Index
This Author published in this journals
All Journal Jurnal Online Mahasiswa (JOM) Bidang Perikanan dan Ilmu Kelautan Jurnal Online Mahasiswa (JOM) Bidang Teknik dan Sains Jurnal Ilmiah Universitas Batanghari Jambi Dinamisia: Jurnal Pengabdian Kepada Masyarakat Jurnal Ilmiah Pendidikan Scholastic International Journal of Economics, Business and Accounting Research (IJEBAR) Akuntansi: Jurnal Riset Ilmu Akuntansi Metrik Serial Humaniora dan Sains
Syafri Syafri
Unknown Affiliation
Agriculture, Biological Sciences & Forestry Humanities Civil Engineering, Building, Construction & Architecture Decision Sciences, Operations Research & Management Earth & Planetary Sciences Economics, Econometrics & Finance Education Engineering Law, Crime, Criminology & Criminal Justice Social Sciences Other

Published : 26 Documents Claim Missing Document
Claim Missing Document
Check
Articles

Found 26 Documents
Search

 1   2   3 
ANALYSIS OF Pb, Cu, and Zn METAL CONNECTIONS IN BLOOD SHELL MEAT (Anadara granosa) WITH DIFFERENT SIZES IN WATERS MUARA ASAHAN RIVER TANJUNGBALAI CITY NORTH SUMATERA Syafri Syafri; Bintal Amin; Nursyirwani Nursyirwani
Jurnal Online Mahasiswa (JOM) Bidang Perikanan dan Ilmu Kelautan Vol 6 (2019): Edisi 2 Juli s/d Desember 2019
Publisher : Jurnal Online Mahasiswa (JOM) Bidang Perikanan dan Ilmu Kelautan

Show Abstract | Download Original | Original Source | Check in Google Scholar

Abstract

ABSTRACT  granosa.This research was conducted from January to April 2019 by taking samples of blood cockles from the waters of the Asahan river, Tanjungbalai city, North Sumatra Province. The purpuse of this research were to know the metal concentrations of Pb, Cu and Zn in different station and different sizes of blood cockle’s shell (Anadara granosa), as well as to find out the level of metal pollution based on MPI (Metal Pollution Index). Analysis of metal concentrations of heavy metal was done by following procedurs outline by Yap et al., (2003). The results showed that the highest Pb metal concentration in meat of small blood clams was found at station 3 namely, 0.7100 μg / g and the low concentration was 0.4716 μg / g at Station 1. While the highest concentration at medium size was found at Station 2 namely , 1.3683 μg / g and low concentration was 0.8000 μg / g at Station 1. The highest Pb concentration at large size was found at Station 3 ie, 2,2200 μg / g and the lowest concentration was 1,2266 μg / g at Station 1. The calculated MPI value for the Asahan estuary research from this study was 3,7260  which was considered quite low compared to other regions. Keywords: Heavy Metal, Pollution, North Sumatra, Industry, Anadara
Perancangan Suspensi Depan Prototipe Campagna T-Rex Car Febrian Febrian; Nazaruddin Nazaruddin; Syafri Syafri
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

Show Abstract | Download Original | Original Source | Check in Google Scholar

Abstract

In designing a safe car while driving, there are many factors to watch out for, such as the suspension system design. In this research, the design of suspension is limited only to discuss the vehicle front suspension. The suspension design process starts from the selection of suspension type, followed by kinematic simulation using Suspension Analyzer v-2.4 software, and stress analysis simulation using Autodesk Inventor software when the vehicle is in braking and turning condition. The result of kinematic simulation of front suspension using Suspension Analyzer v-2.4 was found the change of camber wheel angle by -0.38o when maximum bump (30 mm) and 0.22o when maximum rebound (-30 mm). And the results of static analysis of front suspension components using Autodesk Inventor obtained minimum safety factor value of 1.96 in braking conditions and 1.58 in turn conditions. It was concluded that the front suspension system was still within safe limits.Keyword : suspension, static analysis, kinematic analysis, safety factor
Perancangan Bodi Mobil Hemat Energi Tipe Urban Bono Kampar Yudi Saputra; Nazaruddin Nazaruddin; Syafri Syafri
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

Show Abstract | Download Original | Original Source | Check in Google Scholar

Abstract

When designing a car, it is very important to pay attention to the construction and design of the vehicle. This is useful for getting the security and comfort of users in driving a car. In this study, car body design must have the smallest drag coefficient possible. if the vehicle has a large drag coefficient value, it has a large influence on the efficiency or performance of the vehicle, especially in cars with a large Cd value that will greatly affect vehicle speed. This is useful for minimizing the fuel used, and allows the vehicle to reduce the friction forces caused by air while driving. To get drag coefficients, Computational Fluid Dynamic (CFD) software is used. The software used is Solidworks Flow Simulation. From the results of aerodynamic simulations on four alternative car bodies carried out in this study, the smallest Cd (Coefficient Drag) is the second car body model, which has a Drag Coefficient (Cd) = 0.21Keywords: Car, Aerodynamics, Vehicle Dynamics, Drag Coefficient
Perancangan Dan Analisis Statik Sistem Rangka Asykar Proto Mobil Hemat Energi Teguh Iman; Syafri Syafri; Nazaruddin Nazaruddin
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

Show Abstract | Download Original | Original Source | Check in Google Scholar

Abstract

In design a car, it was necessary to pay attention to the frame structure design to get safety and comfort in driving. The frame design process starts with frame selection and material selection, followed by manual static calculation and stress analysis simulation using Autodesk Inventor 2017. The forces obtained by the frame comes from the weight of the driver, engine, and the body of the car. After the frame design has done, we get the results of the frame with a length of 2700 mm, a width of 550 mm and a height of 565 mm, this is based on the body shape of the car, driver, and available engine. The material of frame is a profile rod rectangular hollow 40 mm x 20 mm x 2 mm and square hollow 40 mm x 40 mm x 2 mm. In the static simulation obtained the greatest stress occurs in the main rod with a value of 100.8 MPa, and with the selection of the safety factor value of 4, so that the material suitable for use is carbon steel ST37. From the simulation results obtained the minimum safety factor value with a value of 1.83 but only in one small area in the frame.Keyword : frame, static analysis, stress, safety factor, Autodesk Inventor
Rancang Bangun Sistem Kontrol Mesin CNC Milling 3 Axis Menggunakan Close Loop System Ikhlash Syukran Harrizal; Syafri Syafri; Adhy Prayitno
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

Show Abstract | Download Original | Original Source | Check in Google Scholar

Abstract

A multi axis of CNC machine needs a circuit control systems that function as the engine's brain. The purpose of this research is to design and developing a circuit control of the CNC milling machine with 3 axis movement. All machining parameters would be setup and operated through the control system so that the machine can operate in accordance with the design in three axes. In the design of the control system used 3 stepper motors as a driver, where each was enabled to move the engine against the x, y, and z axis. There are several steps that must be done in this design, such as the selection of control element data. Furthermore, control elements consisting of Breakout Board, Motor Driver, Stepper Motor, Power Supply, Limit Switch, and Emergency Stop are assembled according to schematic control design. The control system was connected to the PC through the Mach3 software interface to be used to drive the actuator. Prior to use for machining processes, the control system needs to be calibrated so that the machine's sliding dimension matches the command dimensions of the PC. Control system on CNC machines designed using a close loop system where there was a Limit Switch as a feedback sensor to the engine, so what if there was a mistake (error) on the track machine, then the sensor would command the spindle back to home position.Key Words : CNC, Control System, Elements of Control, Mach3, Close Loop
Kaji Numerik Pengaruh Bio-Based Lubricant Terhadap Ketebalan Lapisan Film Dan Tekanan Hidrodinamik Pada Journal Bearing Menggunakan Finite Difference Method Rijaluddin Farihd; Dedi Rosa Putra Cupu; Syafri Syafri
Jurnal Online Mahasiswa (JOM) Bidang Teknik dan Sains Vol 8 (2021): Edisi 1 Januari s/d Juni 2021
Publisher : Jurnal Online Mahasiswa (JOM) Bidang Teknik dan Sains

Show Abstract | Download Original | Original Source | Check in Google Scholar

Abstract

In journal bearings, there is a contact between the shaft and the bearing. The impact that occurs on these contacts is friction which causes wear on the bearing material. This research was conducted to see the effect of bio-based lubricants on the distribution of hydrodynamic pressure and the film thickness on the journal bearings. The numerical assessment was carried out for this study using one of the numerical methods, namely the finite difference method. The finite difference method is a method commonly used to solve the Reynolds equation in which this equation is used to calculate the pressure distribution. The FDM discretization scheme use in this simulation was central-difference because it has a more accurate value approach to the actual value than using other schemes. This research was conducted by varying several parameters with different results. The different types of bio-based lubricants affect the pressure distribution, but not the film thickness which can only be measured by the eccentricity ratio. It was obtained from several bio-based lubricants, namely coconut oil, olive oil, and palm oil that the better lubricant to use is coconut oil because it produces less pressure for other types of lubricants. Keywords : Journal Bearing, Bio-Based, FDM.
Proses Produksi Prototipe Mesin CNC Router 3-Axis Zoro Zulfikar; Syafri Syafri
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

Show Abstract | Download Original | Original Source | Check in Google Scholar

Abstract

Productivity of small industry in Indonesia might be one of the causes of lacking of capital for the procurement of modern machine tools such as CNC (Computer Numerical Control). The purpose of this research is to make the mechanical components of CNC machine and assemble that to produce machine with cheapest prices. Therefore, the machine selling price can be reached by small industry actors. In this research, all mechanical components was made using machining process and was assembled, which using the finished components that can already be found on the market. The machining process included milling, drilling, grinding, sawing and tapping. Engine components to be assembled including of the frame, liner guide, transmission system and drive system in order to form a perfect CNC machine. Joining system of such machine components used a permanent joining such as welding, and temporary joining using bolts. The assembly also used an exchangeable assembly method, so that faster component assembly time and in replacement of damaged components that can be replaced with similar components on the market.Keywords: Prototype, CNC, Router, Machining, Joining, Assembly
Perancangan Dan Analisis Struktur Mekanik Prototipe Mesin CNC Milling 3-Axis Devri Naldy; Syafri Syafri; Mustafa Akbar
Jurnal Online Mahasiswa (JOM) Bidang Teknik dan Sains Vol 3, No 2 (2016): Wisuda Oktober Tahun 2016
Publisher : Jurnal Online Mahasiswa (JOM) Bidang Teknik dan Sains

Show Abstract | Download Original | Original Source | Check in Google Scholar

Abstract

Computer Numerically Controlled (CNC) Machine is a machine tool equipped with mechanical systems and computer-based controls that capable to read the instruction code such as N, G, F, T, etc. These codes will be instructed to CNC machine interface system, so that the machine can work in accordance with the listing program that has been created. In general, the selling price of the machine is expensive. Therefore, in this study a low cost CNC machine has been designed for small and medium enterprises (UKM). Design stage consist of a needs analysis, preparation of the technical specifications of the product, design concept of the product to find alternative concept product and choose the concept product. From design concept to be developed do static analysis on mechanical components CNC machines that include stress and deformation due to loading and its own weight. Static analysis is conducted in two ways, with manual calculations and finite element analysis using software Autodesk Inventor 2012 Student Edition. Results of static analysis shows that stress occurs at 7.122 MPa on the z-axis, 72.31 MPa on the y-axis and 2,202 MPa on the x-axis. Deformation is equal to 0.003644 mm on the z-axis, 0.5404 mm on the y-axis and 0.005173 mm on the x-axis.Keyword : CNC Machine, Autodesk Inventor, stress, deformation
Perancangan Dan Pembuatan Struktur Rangka Dinamik Sun Tracking Muhamad Rifan; Adhy Prayitno; Syafri Syafri
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

Show Abstract | Download Original | Original Source | Check in Google Scholar

Abstract

Riau is an area located on the equator, meaning that this region has the potential to be traversed by the sun throughout the year. This solar potential is an alternative to the use of energy derived from fossil energy. In general, solar cells are not optimal in the absorption of sunlight. Therefore, in this study designed a Sun Tracking engine that is destined for solar cell follow the movement of the sun. Stages of design consists of needs analysis, preparation of product technical specifications, designing product concepts to generate alternative product concepts which then selected the concept to be made. From the selection of concept is made the static analysis on the mechanical components of the Sun Tracking machine, which includes stress and deformation due to loading and own weight. The static analysis is done in two ways that is by manual calculation and finite element analysis using Autodesk Inventor 2012 Student Edition software. Based on the result of static analysis , revealed stress of 8.381 MPa on stem 1, 8.769 MPa on stem 2, 0.5378 MPa at stem 3 and 0.562 MPa on stem 4. Deformation happened is 0.026830 mm in stem 1 , 0.028073 mm on the stem 2, 0.0006277 mm on the trunk 3 and 0.0005041 mm on the trunk 4Keywords : Sun Tracking, Autodesk Inventor, Solar cell
Analisis Kinerja Kompresor Gas Reciprocating C-401 Menggunakan Metode Kenaikan Enthalpy Di PT. Energi Mega Persada Rahmad Fauzi; Syafri Syafri; Asral Asral
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

Show Abstract | Download Original | Original Source | Check in Google Scholar

Abstract

In heavy lifting equipment that works pneumatically, the compressor is used in its function as an air filling device for power sources. A compressor when viewed from the way it works, there are two types of compressors, each of which works differently. The first type is a compressor with a positive displacement work method and the second is a compressor with a dynamic working method. Where the difference between the two types is the first positive displacement type compressor, this compressor model works by inserting air into a closed space, then at the same time the volume of the space is reduced, then the pressure inside will naturally increase. This high pressure which is used for various purposes in accordance with the designation of the compressor. This positive displacement compressor is used in reciprocating compressors and rotary. Meanwhile on the dynamic model compressor, the volume of space is fixed but the air inside the space is given speed. Then at the same time the speed is changed to pressure. This happens because the air in the room whose volume is still under pressure. Compressors that use this dynamic model are usually on turbo axial flow devices. Reciprocating gas compressors located at PT. Energi Mega Persada (EMP) Riau, has experienced a decline in performance, causing the performance of the compressor gas to be not optimal in compressing gas.Keywords: Enthalpy Rise Method, Reciprocating Gas Compressor, Peformance Decrease.
Co-Authors Adhy Prayitno Alvi Syahri Anita Susilawati Anju Pritia Dapa Anuar, Kaspul Apri Setiawan Arief Yanuar Chrise Asral, Asral Bintal Amin Cupu, Dedi Rosa Putra Devri Naldy Dimas Ariyono Dodi Abrar Eka Setia Wahyudi Fadila Alfandi Feblil Huda Febrian Febrian Ikhlash Syukran Harrizal Margono Margono Muhamad Rifan Mustafa Akbar Nadhila Rahma Rustian Nazaruddin Nazaruddin Nirdukita Ratnawati Nursyirwani, Nursyirwani Putri Aulia Febrianti Rahmad Fauzi Richard Andrew Rijaluddin Farihd Riski Dwi Prasetio Suandi Suandi Teguh Iman Yudi Saputra Zoro Zulfikar