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All Journal SINTEK JURNAL: Jurnal Ilmiah Teknik Mesin Setrum : Sistem Kendali-Tenaga-elektronika-telekomunikasi-komputer Mesin International Journal of Engineering, Science and Information Technology JURNAL PERMADI: PERANCANGAN, MANUFAKTUR, MATERIAL DAN ENERGI PROSIDING SEMINAR NASIONAL FISIKA (E-JOURNAL) Journal of Innovation Research and Knowledge
Riza Wirawan
Institut Teknologi Bandung
Humanities Astronomy Automotive Engineering Biochemistry, Genetics & Molecular Biology Chemical Engineering, Chemistry & Bioengineering Chemistry Civil Engineering, Building, Construction & Architecture Computer Science & IT Control & Systems Engineering Decision Sciences, Operations Research & Management Earth & Planetary Sciences Economics, Econometrics & Finance Education Electrical & Electronics Engineering Energy Engineering Health Professions Industrial & Manufacturing Engineering Law, Crime, Criminology & Criminal Justice Library & Information Science Materials Science & Nanotechnology Mathematics Mechanical Engineering Physics Social Sciences Transportation Other

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Uji Kemampu-Bakaran Pembungkus Kabel NYM Berstandar SNI Dengan Differencial Scanning Calorimetric Himawan Hadi Sutrisno; Riza Wirawan; Triyono Triyono
Setrum : Sistem Kendali-Tenaga-elektronika-telekomunikasi-komputer Vol 2, No 1 (2013): Edisi Juni 2013
Publisher : Fakultas Teknik Elektro - Universitas Sultan Ageng Tirtayasa

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (307.784 KB) | DOI: 10.36055/setrum.v2i1.236

Abstract

Bencana Kebakaran yang sering melanda pemukiman rawan bencana di Ibu Kota Jakarta. Hal itu menjadi pusat perhatian Pemprov DKI Jakarta akhir akhir ini. Konsleting listrik, ledakan gas serta lemahnya pengetahuan masyarakat menjadi hal yang klaim sebagai faktor penyebab kebakaran. Konsleting listrik penyebab kebakaran dapat timbul akibat adanya pemakaian kabel melebihi kapasitas daya hantar arus, sambungan yang tidak standart, dan timbulnya panas kabel yang mengakibatkan terbakarnya lapisan pembungkus kabel. Ketahanan thermal dari pembungkus kabel menjadi hal yang menarik untuk diketahui Penelitian ini mencoba menguji kemampu bakaran dari beberapa merk kabel berjenis YNM berstandart SNI yang dipakai untuk instalasi listrik di perumahan penduduk menggunakan Differencial Scanning Calorimetric (DSC). Hasil pengujian memperlihatkan perbedaan yang relative kecil pada karakteristik fase glass dan fase rubbery pada bahan uji.
Sifat Termal Karbon Aktif Berbahan Arang Tempurung Kelapa Daniel Tamado; Esmar Budi; Riza Wirawan; Haryo Dwi; Anggie Tyaswuri; Erlinda Sulistyani; Esty Asma
PROSIDING SEMINAR NASIONAL FISIKA (E-JOURNAL) Vol 2 (2013): PROSIDING SEMINAR NASIONAL FISIKA (E-JOURNAL) SNF2013
Publisher : Program Studi Pendidikan Fisika dan Program Studi Fisika Universitas Negeri Jakarta, LPPM Universitas Negeri Jakarta, HFI Jakarta, HFI

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (471.224 KB)

Abstract

It has been observed a thermal property of activated carbon which made from coconut shell with DSC (Differential Scanning Calorimeter) apparatus in various atmosphere. The thermal properties of activated carbon are closely related to the pores number and sizes of particle. The early parameters which determined to that are depending on a production processes, such as temperature of pyrolisis process, Pressure (on compaction process) and forming of powder on milling process. Besides of those points, the thermal properties are also can be reviewed from temperature glass of that. DSC analysis result showed that there is a temperature peaks different on the each atmospheric conditions (Gases contained in atmosphere) so that we can determine an ideal condition of activated carbon in any utilities Keywoards : activated carbon, thermal property, differential scanning calorimeter.
Wear resistance of abradable-conductive powder deposited by using hvof with different surface preparation and spray distance Hendy Roesma Wardhana; Rd. Dadan Ramdan; Budi Prawara; Erie Martides; Riza Wirawan; Bambang Widyanto; Rochim Suratman; Irma Pratiwi
SINTEK JURNAL: Jurnal Ilmiah Teknik Mesin Vol 16, No 1 (2022): SINTEK JURNAL
Publisher : University of Muhammadiyah Jakarta

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.24853/sintek.16.1.23-29

Abstract

Along with many material failures due to worn steel components, HVOF (High Velocity Oxygen Fuel) coating based abradable material can be solution to overcome this problem. However, abradable-conductive material is still rarely used for coating, therefore it needs investigation to find out the optimum parameters of process. In this work, the surface treatment on substrate was carried out by the different methods such blasting, etching, and blasting-etching to obtain the rough surface. The spraying distance of HVOF process was varied on 20 cm and 30 cm. Blasting-etching are able to achieve the roughest surface of substrate. Meanwhile, the spray distance of 20 cm produces thicker layer than the longer spray distance. The combination of blasting-etching and the shorter spray distance are able to reach the optimum wear resistance as presented in pin-on-disc test.
Pengaruh Konsentrasi NaOH terhadap Sifat Termal Komposit Eceng Gondok dan Carbon Nanotube (CNT) dalam Matriks HDPE Anggrainy, Rani; Riza Wirawan; Siska Titik Dwiyati
Jurnal Permadi : Perancangan, Manufaktur, Material dan Energi Vol 3 No 1 (2021): JURNAL PERMADI: PERANCANGAN, MANUFAKTUR, MATERIAL DAN ENERGI
Publisher : Universitas Nusa Putra

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (468.929 KB) | DOI: 10.52005/permadi.v3i1.43

Abstract

This study aims to determine the effect of alkali concentration on the thermal properties of HDPE composites with water hyacinth and carbon nanotubes (CNTs). The method used in this study is the experimental method. Composites made of natural fiber filler, the alkali treated water hyacinth. The water hyacinth was also filled was treated in alkali solution at various concentration (0%, 2%, 4%, 6%, and 8%). In addition to using water hyacinth fiber, the carbon nanotube (CNT) in a matrix of high-density polyethylene (HDPE). The composites were made using Rheomix OS machine. Furthermore, thermal testing of composite specimens using machine Thermogravimetric Analysis (TGA) were conducted. The results obtained from testing the thermal properties is the thermal resistance value. Thermal resistance of composites with alkali treatment of 0%, 2%, 4%, 6%, and 8% were 258,9 0C, 259,5 0C, 260,3 0C, 264,0 0C, and 265,9 0C, respectly. Based on these results it can be concluded that the concentration of NaOH improves the thermal resistance of the composite.
Kajian Penentuan Modulus Elastisitas Baja dan Aluminium dengan Metoda Ultrasonic Pitch & Catch Priambodo, Toni Agung; Judawisastra, Hermawan; Wirawan, Riza
Mesin Vol 30 No 2 (2025)
Publisher : Faculty of Mechanical and Aerospace Engineering

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.5614/MESIN.2025.30.2.4

Abstract

Modulus elastisitas adalah salah satu sifat material yang menyatakan nilai kekakuan dari material tersebut. Modulus elastisitas menunjukkan kemampuan material untuk menahan deformasi elastis saat diberi tegangan, yang mencerminkan hubungan antara tegangan dan regangan dalam batas elastisitas material tersebut. Metoda paling umum untuk menentukan nilai modulus elastisitas adalah dengan uji tarik tetapi masih mempunyai kekurangan harus merusak benda uji. Metoda uji tidak rusak yang dapat digunakan untuk menentukan nilai modulus elastisitas salah satunya adalah dengan menggunakan uji ultrasonik. Penentuan nilai modulus elastisitas dengan metoda ultrasonik pada material logam sudah dilakukan sebelumnya namun belum dapat menentukan nilai modulus elastisitas pada material pipa atau pada material dengan permukaan yang luas. Penelitian ini bertujuan mengkaji penentuan nilai modulus elastisitas pada material baja dan aluminium dengan metoda ultrasonik pitch & catch dengan variasi formula, variasi frekuensi probe dan variasi tebal benda uji. Validasi hasil uji dilakukan dengan membandingkan modulus elastisitas hasil metoda ultrasonik pitch & catch dengan modulus elastisitas dari referensi. Hasil penelitian menunjukkan bahwa variasi frekuensi probe, jarak antar probe dan tebal benda uji diatas 5mm menghasilkan nilai modulus elastisitas yang sesuai dengan referensi. Tebal benda uji dibawah 5mm menjadi batasan dari metoda ultrasonik pitch & catch dalam menentukan nilai modulus elastisitas karena data kecepatan gelombang longitudinal tidak akurat pada material yang tipis.
Study on Magnetic Properties Characterization of Aceh Iron Sand as Raw Biomedical Application Materials Sayuti, Muhammad; Yusuf, Muhammad; Putra, Reza; Wirawan, Riza
International Journal of Engineering, Science and Information Technology Vol 5, No 3 (2025)
Publisher : Malikussaleh University, Aceh, Indonesia

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.52088/ijesty.v5i3.975

Abstract

The magnetic properties characterization of Aceh iron sand as the preferred material for biomedical applications was studied. Meanwhile, Aceh's iron sand is used as raw cement-making material. It is hoped that in the future, it can be used in many different biological and medical applications, such as diagnostic tests for early disease detection, to serve as tools for non-invasive imaging and drug development. Samples of the natural resource were prepared using a magnetic separator, and the concentrates were mashed by the ball milling method to achieve 112.7µm (MK), 119.3 µm (MT), 112,4 µm (LP), and 115.1 µm (SK) particle size. These features were evaluated from loop hysteresis using a vibration sample magnetometer (VSM), while x-ray diffraction (XRD) was employed to analyze iron oxide. The results estimated the values of saturation magnetization, remanent magnetization, and coercivity from Mon Klayu, Mantak Tari, Lam Panah, and Syiah Kuala at 67.79 emu/g, 10.36 emu/g and 0.02 T; 83.49 emu/g, 13.22 emu/g and 0.02 T; 62.17 emu/g, 9.32 emu/g and 0.02 T; 73.26 emu/g, 10.34 emu/g and 0.02 T, respectively. However, Fe3O4 (magnetite) occurred predominantly in the selected locations.
EFFECT OF NIOBIUM ADDITION ON THE ELECTROCHEMICAL AND MECHANICAL PROPERTIES OF TITANIUM ALLOYS AS BIOMATERIALS Dipodiwiryo, Adam Arlei; Djoko Hadi Prajitno; Raden Dadan Ramdan; Riza Wirawan
Journal of Innovation Research and Knowledge Vol. 4 No. 5: Oktober 2024
Publisher : Bajang Institute

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.53625/jirk.v4i5.8694

Abstract

Titanium is a metal known for its high strength, lightweight, and excellent corrosion resistance, making it widely used as a biomaterial in medical applications. To further enhance these properties, particularly corrosion resistance and mechanical strength, niobium (Nb) was added to titanium-aluminum (Ti-Al) alloys. In this study, three alloy compositions, Ti-5Al-10Nb, Ti-5Al-8Nb, and Ti-5Al-6Nb, were fabricated using the Electric Arc Furnace (EAF) method. After the melting process, the specimens were characterized using Scanning Electron Microscopy (SEM) combined with Energy Dispersive Spectroscopy (EDS) to analyze the microstructure and alloying element distribution. X-Ray Diffraction (XRD) was employed to identify the crystalline phases formed in the alloys. Electrochemical testing was performed using the Tafel polarization method to measure corrosion rates, while mechanical testing was conducted using the Vickers hardness test to determine material hardness. The results showed that increasing niobium content in the titanium alloy significantly improved the corrosion resistance and hardness of the specimens. The Ti-5Al-10Nb specimen exhibited the lowest corrosion rate and highest hardness compared to the other specimens. These findings suggest that the addition of niobium can enhance the performance of titanium alloys as biomaterials, particularly for hip joint implant applications.
Co-Authors Anggie Tyaswuri Anggrainy, Rani Bambang Widyanto Budi Prawara Daniel Tamado Dipodiwiryo, Adam Arlei Djoko Hadi Prajitno Erie Martides Erlinda Sulistyani Esmar Budi Esty Asma Haryo Dwi Hendy Roesma Wardhana Hermawan Judawisastra, Hermawan Himawan Hadi Sutrisno Irma Pratiwi Muhammad Yusuf Priambodo, Toni Agung Putra, Reza Ramdan, Raden Dadan Rd. Dadan Ramdan Rochim Suratman Sayuti, Muhammad Siska Titik Dwiyati Triyono Triyono