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All Journal DINAMIKA Jurnal Ilmiah Teknik Mesin Jurnal Ilmiah Wahana Pendidikan
Marthina Mini
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Religion Education Energy Industrial & Manufacturing Engineering Materials Science & Nanotechnology Mechanical Engineering Social Sciences Other

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RANCANG BANGUN ALAT UJI KEKUATAN SABUK DAGU HELM Marthina Mini
Dinamika : Jurnal Ilmiah Teknik Mesin Vol 3, No 2 (2012)
Publisher : Jurusan Teknik Mesin, Universitas Halu Oleo

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.33772/djitm.v3i2.290

Abstract

Helm untuk pengendara kendaraan bermotor roda dua merupakan salah satu alat pengaman bagi pengendara yang harus digunakan saat berkendara. Agar dapat berfungsi sebagaimana mestinya, sebelum dipasarkan helm harus melalui beberapa proses pengujian yang sesuai standar. Beberapa peneliti telah melakukan rancang bangun dan pengembangan untuk beberapa alat uji helm yang didasarkan pada standar-standar yang telah ditetapkan. Untuk melengkapi alat uji yang sudah ada, maka pada penelitian  ini dilakukan perancangan alat uji sabuk dagu helm dengan menggunakan pegas sebagai sistem pembebanannya. Perancangan alat uji kekuatan sabuk dagu helm ini mengacu pada standar uji yang diterapkan oleh Standar Industri Indonesia (SII 1961.85).Dari penelitian  ini didapatkan sebuah gambar teknik rancangan alat uji kekuatan sabuk dagu helm. Dimana alat uji yang dirancang memiliki tinggi 1184 mm dan lebar 480 mm, dengan material baja. Mekanisme pembebanan menggunakan pegas dengan konstanta kekakuan 9.25 N/mm, sumber daya penggerak motor DC dan diatur dengan menggunakan unit kontrol sederhana yang tersusun atas relay dan limit switch.
Analisa Pengaruh Putaran Spindel Terhadap Daya dan Efisiensi Pemotongan Pada Proses Pembubutan Baja St 60 Dengan Melakukan Perlakuan Panas Marthina Mini; Bosta Sihombing; Tanwir Tanwir
Jurnal Ilmiah Wahana Pendidikan Vol 8 No 14 (2022): Jurnal Ilmiah Wahana Pendidikan
Publisher : Peneliti.net

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (180.908 KB) | DOI: 10.5281/zenodo.7556062

Abstract

The manufacturing industry, especially in the turning process, where turning is a cutting process that uses machine tools to produce cylindrical shapes and can also be used to thread, drill and flatten rotating objects by cutting the rotating workpiece on the spindle using cutting tools (chisels ) that have a level of hardness above the formed workpiece. The results obtained from this study are to obtain the value of the power and efficiency of the material without heat treatment, the value of power is 0.081154 kw at 290 rpm, 0.103542 kw at 370 rpm, 0.128727 kw at 460 rpm. The efficiency value is 0.000054 (%) at 290 rpm 0.00006902 (%) at 370 rpm 0.0000858 (%) at 460 rpm rotation. For heat-treated materials, the power value is 0.081154 kw at 290 rpm, 0.103542 kw at 370 rpm, 0.128727 kw at 460 rpm. The efficiency value is 0.0000541 (%) at 290 rpm 0.000069028 (%) at 370 rpm, 0.0000858 (%) at 460 rotation for 60 mm infeed length
Analisa Unjuk Kerja Internal Combustion Engine Tipe T113d Terhadap Emisi Gas Buang Suyatno Suyatno; Helen Riupassa; Marthina Mini
Jurnal Ilmiah Wahana Pendidikan Vol 9 No 18 (2023): Jurnal Ilmiah Wahana Pendidikan
Publisher : Peneliti.net

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.5281/zenodo.8365395

Abstract

This research aims to determine the performance of the Internal Combustion Engine Type T113D on carbon monoxide (CO) and hydrocarbon (HC) exhaust emissions, engine efficiency and rotation, to obtain efficient CO and HC. The research process was carried out by: testing rotation variations of motor power, torque, thermal efficiency, average effective direct fuel consumption, carbon monoxide and hydrocarbons. The research results showed that at 1000 rpm the highest CO was 10.00% and the lowest CO at 3000 rpm was 8.59%. What then influences the increase and decrease in CO is the reduction in fuel and air which is less homogeneous or does not burn completely in the combustion chamber. So it makes CO become high. High carbon monoxide is influenced by a poor mixture of air and fuel so that it can affect combustion in the combustion chamber, causing low engine speed. The lower the rotation, the higher the hydrocarbons (HC), this is because the mixture of air and fuel is less homogeneous which can affect the level of hydrocarbons.
Konservasi Wilayah Recharge Daerah Air Tanah Dan Wilayah Pelepasan Berbasis Doyo Baru Jayapura Theodora Ngaderman; Anna Rumabar; Marthina Mini; Mercy Zebua
Jurnal Ilmiah Wahana Pendidikan Vol 9 No 19 (2023): Jurnal Ilmiah Wahana Pendidikan
Publisher : Peneliti.net

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.5281/zenodo.10034235

Abstract

Factors that influence groundwater conservation include; groundwater basin boundaries, recharge areas and groundwater discharge areas, as well as water sources. The methods used in this research are interviews and questionnaires, measurement and observation. The geology of the research area consists of the oldest lithology, namely metamorphic rocks, then fluvial deposits were deposited on top. Geomorphologically, it is composed of structural hill and fluvial plain morphological units. Doyo Baru is located in the Sentani groundwater basin system (CAT), with rock formations that are fluvial deposits where water sources are known to be abundant. The groundwater basin (CAT) in the Jayapura region shows low water sources in rock formations of Tertiary Miocene age. Meanwhile, the groundwater basin of the Demta rock formation, which makes up Pre-Tertiary age metamorphic (pTMc) and ultramafic (UM) rock units, is known to have moderate water sources. The recharge area in the Doyo Baru area is visible on the map in blue, while the area in white is the discharge area. The discharge area here is also the Doyo Baru groundwater basin (CAT). The catchment area from the spring is shown on the map, while the depth of the groundwater level is measured in community wells on the map which is circled in red. The catchment area from the spring is shown on the map, while the depth of the groundwater level is measured in community wells on the map which is circled in red. Conservation areas appear on the map of the Doyo Baru area in blue where existing water sources need to be protected and preserved. Wells made in disposal areas generally have shallow groundwater depth. From the measurement results, the Doyo Baru research area is at an altitude of 84-108 m above sea level with a groundwater level ranging from 8-28 m (below the CAT surface).
Co-Authors Anna Rumabar Bosta Sihombing Helen Riupassa Mercy Zebua Suyatno Suyatno Tanwir Tanwir Theodora Ngaderman