Article Per Year (5 Year)
p-Index From 2020 - 2025
0.983
P-Index
This Author published in this journals
All Journal Jurnal Teknik Mesin TECHSI - Jurnal Teknik Informatika Journal of Community Dedication
Hafni Hafni
Unknown Affiliation
Humanities Civil Engineering, Building, Construction & Architecture Computer Science & IT Control & Systems Engineering Decision Sciences, Operations Research & Management Education Energy Industrial & Manufacturing Engineering Materials Science & Nanotechnology Mechanical Engineering Social Sciences Other

Published : 6 Documents Claim Missing Document
Claim Missing Document
Check
Articles

Found 6 Documents
Search

 1 
APLIKASI TATA RIAS UNTUK POLA MATA WANITA MENGGUNAKAN METODE PEIRCE SIMILARITY DAN KOHONEN Eva Darnila; Hafni Hafni
TECHSI - Jurnal Teknik Informatika Vol 8, No 1 (2016)
Publisher : Teknik Informatika Universitas Malikussaleh

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.29103/techsi.v8i1.126

Abstract

Tata rias mata yaitu berfungsi untuk menyempurnakan bentuk mata yang kurang sempurna menjadi bentuk mata yang  ideal atau bentuk mata (sipit, normal dan block)  dengan bantuan bahan dan alat kosmetik. Berbagai tips rias mata yang akan membuat tampilan mata menjadi lebih baik, seperti riasan pada mata sipit yang dapat menjadikan mata terlihat lebih besar. Tujuan dari penelitian ini adalah untuk mengenali pola mata wanita untuk tips tata rias dengan pengenalan menggunakan similarity peirce dan kohonen berdasarkan energi yang didapat terhadap orientasi dan frekuensi tertentu. Sistem ini dibangun dengan menggunakan bahasa pemograman Borland Delphi 07. Metode penelitiannya diperoleh dari studi literatur berbagai buku dan artikel yang terdiri dari beberapa tahap, yaitu tahap input citra, resize citra, grayscale, similarity peirce, kohonen, dan tahap terakhir menghitung nilai energi. Hasil  penelitian menyatakan bahwa Tingkat keakuratan pengenalan pola mata dalam penelitian ini sangat ditentukan oleh banyaknya pola tepi objek yang saling berhubungan.
The Effect of 70o and 85o Electrode Angles on Reverse Welding Techniques On Fusion Depth Hafni Hafni; Rifqi Rifqi
Jurnal Teknik Mesin Vol 12 No 1 (2022): Jurnal Teknik Mesin Vol.12 No.1 April 2022
Publisher : Lembaga Penelitian dan Pengabdian Masyarakat (LP2M) - ITP

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.21063/jtm.2022.v12.i1.61-64

Abstract

Shielded Metal Arc Welding is a liquid welding process (fusion welding) that produces heat from an electric arc between the electrode and the workpiece. The depth of fusion formed is determined by the heat input, the electrode angle and the welding direction. The research was conducted in the Mechanical Engineering laboratory of the Padang Institute of Technology. The test material used is low carbon steel 10 mm thick, 100 mm long and 100 mm wide. Welding is carried out on the surface of the work material as many as 4 welding lines, each of which has a distance of 20 mm. Weld length 100 mm. The specifications of the AWS E 6013 electrode are 3.2 mm in diameter. AC SMAW welding machine with a voltage of 30 Volts. Welding is carried out according to the working drawings, the welding current is 85 Ampere, the electrode angles are 700 and 850, the weld length is 100 mm and the welding direction is reversed (the electrode attracts welding fluid). From the welding, the welding speed is 2.51 mm/s for the 700 electrode angle and 2.48 mm/s for the 850 electrode angle. The heat input for each electrode angle is 1024.09 J/mm. at the 700 electrode angle has a penetration presentation of 10.85%, 1.14% greater than the 850 electrode angle. This shows that the electrode angle affects the penetration depth and weld width.
The Effect of Electrode Angle on the Backward Directional Longitudinal Against Penetration Percentage Hafni Hafni; Rifqi
Jurnal Teknik Mesin Vol 12 No 2 (2022): Jurnal Teknik Mesin Vol.12 No.2 October 2022
Publisher : Lembaga Penelitian dan Pengabdian Masyarakat (LP2M) - ITP

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.21063/jtm.2022.v12.i2.116-119

Abstract

Shielded Metal Arc Welding (SMAW) is one of the liquid welding processes (fusion welding) that produces a homogeneous fusion of the electrode with the base metal (base metal), which is caused by an electric arc that generates high heat to melt the electrode and base metal (base metal). simultaneously and protected by a shielding gas from the chemical reaction of the electrode flux. The depth of fusion formed is determined by the heat input, the electrode angle and the welding direction. The research was conducted at the Mechanical Engineering Laboratory of the Padang Institute of Technology. The base metal used is low carbon steel ST 37 with a thickness of 10 mm and a length of 100 mm. width 100 mm. Welding is carried out on the surface of the base metal in the flat position, the type of connection (weld type) is a surfacing weld with 4 welding lines, each strip having a distance of 20 mm. Weld length 100 mm. AWS E6013 electrode specifications with a diameter of 3.2 mm. SMAW welding machine AC current with a voltage of 30 V. current 85 A. The measured electrode angle between the electrode and the welding line is 75o, 85o, 90o. The backward welding direction where the electrode draws the welding fluid into the welding path and the normal arc height where the distance between the electrode and the base metal is equal to the diameter of the electrode. From the welding results, a penetration presentation will be obtained, namely the ratio of the depth of fusion to the width. The research results obtained welding speed: 2.48 mm/s for electrode angle 75o, 2.49 mm/s for electrode angle 85o and 2.51 mm/s for electrode angle 90o. Heat input for electrode angle 750 is 1015.93 J/ mm , the heat input for the electrode angle 85o is 1024.20 J/mm and the heat input for the electrode angle 90o is 1015.93 J/mm. From the comparison of the width with the depth of fusion, it is obtained; The electrode angle 85o has a penetration presentation of 9.85%, which is better in height than the electrode angle 75o, which has a penetration presentation of 8.43%, and the electrode angle 90o has a penetration presentation of 8.35%..
Effect of Electrode Moisture in DC Current SMAW Process on The Welding Results of Low Carbon Steel Hafni Hafni; Novriwan Novriwan
Jurnal Teknik Mesin Vol 13 No 1 (2023): Jurnal Teknik Mesin Vol.13 No.1 April 2023
Publisher : Lembaga Penelitian dan Pengabdian Masyarakat (LP2M) - ITP

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.21063/jtm.2023.v13.i1.27-31

Abstract

Welding using a wetelectrode and polarity selection is thought to affect the defects that usually arise in the welding results of low carbon steel type ST 37. To find out how much influence the humidity of the electrode and polarity have on defects in low carbon steel welding results, a study was carried out using oil fluids as a moisturizing agent for the electrode. The process of humidifying the electrode is carried out by immersing the electrode until it absorbs the oil fluid before welding it on the base metal. After welding with these electrodes, a metallographic test was carried out to observe the macrostructure and microstructure of the welding results. The conclusion that can be drawn from the test results is that the humidity of the electrode by oil does not affect the defects that arise in low carbon steel welding results as long as it does not damage the flux from the electrode.
Development of AFRO Water Treatment Equipment Hafni Hafni; Dedi Wardianto; Asmara Yanto
Jurnal Teknik Mesin Vol 13 No 2 (2023): Jurnal Teknik Mesin Vol.13 No.2 October 2023
Publisher : Lembaga Penelitian dan Pengabdian Masyarakat (LP2M) - ITP

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.21063/jtm.2023.v13.i2.49-53

Abstract

Water is a source of life, but it is very easily polluted because water is known as a universal solvent and is able to dissolve many substances. Water pollution is the pollution of water bodies (seas, lakes, rivers, groundwater) caused by human activities. To obtain water that meets water quality standards, it must be supported by an appropriate water treatment system, one of which is the water treatment tool in this research, called AFRO. AFRO works with a reverse osmosis filtration aeration process. Previously, AFRO was developed to treat raw water containing dissolved impurities. However, the results are less than satisfactory, so it needs to be developed further to meet the need for clean water that can be utilized by the community. The development of AFRO in this research is based on the House of Quality (HQ) matrix. From this HQ matrix, a presentation of development priorities was obtained from the previous one in the form of design changes of 16.1%, material changes of 9.6%, processing processes of 14% and energy changes of 9.2%. From the tests that have been carried out, this time AFRO can process raw water from dissolved and insoluble impurities. This tool is also equipped with a solar energy utilization system. The AFRO water treatment process developed consists of (1) chemical process, (2) aeration, (3) filtration, (4) reverse osmosis and (5) disinfection using ultra violet (UV) light.
MENINGKATKAN HASIL BELAJAR PAI DENGAN MENGGUNAKAN METODE DISKUSI DI SDN 13 PANDAM Hafni Hafni
JOURNAL OF COMMUNITY DEDICATION Vol. 5 No. 1 (2025): FEBRUARI
Publisher : CV. ADIBA AISHA AMIRA

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

Abstract

This study aims to improve the learning outcomes of Islamic Religious Education (PAI) among fifth-grade students at SD Negeri 13 Pandam through the implementation of the discussion method. The research method used is Classroom Action Research (CAR) based on the spiral model of Kemmis and McTaggart, which includes planning, implementation, observation, and reflection in two cycles. Research data were collected through formative tests, observations, and interviews. The results of the study indicate that the implementation of the discussion method successfully enhanced students' learning outcomes in cognitive, affective, and psychomotor aspects. In Cycle I, the percentage of students achieving mastery learning was 49.1%, with an average score of 71.8. In Cycle II, the mastery percentage increased to 81.8%, with an average score of 80.5. These findings demonstrate that the discussion method is effective in improving PAI learning outcomes, particularly on the topic of living peacefully in diversity, as related to QS. Ali 'Imran: 64 and QS. Al-Baqarah: 256.
Co-Authors Asmara Yanto Eva Darnila Novriwan Novriwan Rifqi Rifqi Rifqi