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Analisis Pengaruh Variasi Suhu dan Jarak Gap Terhadap Parameter Penggunaan Hot Gas Welding Pada Pembuatan Perahu PVC Anauta Lungiding A.R.; Aurista Miftahatul Ilmah; Nely Handayani Kusuma Hadi; Syahifur rohman
INOVTEK POLBENG Vol 13, No 1 (2023): Inovtek VOL. 13 NO 1 2023
Publisher : POLITEKNIK NEGERI BENGKALIS

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.35314/ip.v13i1.3204

Waduk Klampis berada di Kabupaten Sampang yang berlokasi di Kec. Kedundung. Namun, keberadaan waduk ini belum dapat dioptimalkan dengan baik. Kondisi saat ini belum adanya sarana yang dapat menunjang para wisatawan untuk menikmati keindahan dari Waduk Klampis. Melihat kebutuhan masyarakat akan sarana yang ekonomis dan praktis maka, diperlukan material alternatif. Salah satu material altenatif yang digunakan berupa polyvinyl chloride(PVC) yang memiliki nilai ekonomis serta ringan dan mudah dalam perawatan. Pada proses pembuatan perahu berbahan PVC diperlukan konstruksi yang kuat sehingga, dilakukan penelitian mengenai pengaruh variasi suhu dan jarak gap terhadap hasil las menggunakan hot gas welding. Metode yang diakukan berupa pembuatan sempel dan dilakukan pengujian tarik. Hasil penelitian ini dari suhu yang digunakan (100áµ’C, 140áµ’C, dan 150áµ’C) dan variasi jarak gap (2 mm, 3 mm, dan 4 mm). Sehingga, menghasilkan nilai ultimate strange terbaik dengan jarak gap 2 mm dan suhu 140áµ’C.

APPLICATION OF NUMERICAL MODELING TO PIPE LEAKS IN FLUID FLOW Aurista Miftahatul Ilmah; Arief Syarifuddin; Anauta Lungiding Angga Risdianto
Jurnal Informatika dan Teknik Elektro Terapan Vol 12, No 1 (2024)
Publisher : Universitas Lampung

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.23960/jitet.v12i1.3954

Pipes are a medium used to move flowing fluids and are very dependent on pressure and speed. Leaks in pipes can cause physical loss of water. This can be caused by many things, one of which is a leak caused by a hole in the pipe which can disrupt the flow of water so that the flow of water or fluid will change, including the pressure and speed. A fluid flow can be visualized using simulation or mathematical modeling using finite differences. By using the GNU Octave application, namely numerical computing which can be accessed for free without a license which is used as data visualization, it can provide an overview of fluid flow including the occurrence of leaks in pipes, namely by visually representing the state of fluid flow when a leak occurs in a pipe. With this visualization, a fluid flow pattern is produced where leaks occur at several different points. From the research results, it was found that the pipe before it got a leak would be laminar, but when it got a leak, the fluid flow would become a fluid flow that switched to transitional fluid flow or turbulence. Apart from that, the placement of coordinate variations slightly affects the fluid flow line

Analysis of the Effect of Sound Dampening on Ship Engines Based on Tofu Dregs Composite Material (Glycine Max (L) Merill) Wijaya, Belqis Risky; Ilmah, Aurista Miftahatul; Risdianto, Anauta Lungiding Angga; Prasetyo, Taufan; Iswidodo, Windra; Sahari, Sahari
Jurnal Fisika Papua Vol. 3 No. 2 (2024): Jurnal Fisika Papua
Publisher : Universitas Cenderawasih

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.31957/jfp.v3i2.197

Noise in the engine room of a ship is a significant problem that can affect the health and comfort of crew members. This study aimed to evaluate the potential of tofu dregs as a sound insulation material in the form of a composite of carbon black and talak duco. The research method included making composite specimens with variations in composition, followed by testing the sound absorption coefficient using the impedance tube method. The results showed that the specimen with 30% tofu dregs, 45% carbon black, and 25% talak duco produced the highest sound absorption coefficient of 0.24. These findings show that tofu dregs have potential as an environmentally friendly and economical sound insulation material and can be used to reduce noise in ship engine rooms. This study contributes to the development of natural fiber-based insulation materials in the maritime industry.

Optimization of Biodiesel Production from Sunflower Oil Using Sodalite-Based Catalyst via Taguchi Method Hamid, Abdul; Jakfar, Amin; Rahmawati, Zeni; Armansyah, Muhammad Doni; Wahyuni, Tri; Purbaningtias, Tri Esti; Febriana, Ike Dayi; Abdullah, Mohammad; Ilmah, Aurista Miftahatul; Rohmah, Faizatur
Jurnal Teknik Kimia dan Lingkungan Vol. 9 No. 2 (2025): October 2025
Publisher : Politeknik Negeri Malang

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.33795/jtkl.v9i2.7345

The growing demand for alternative fuels has highlighted biodiesel as sustainable substitute for fossil diesel. In this study, biodiesel was produced from sunflower seed oil using heterogeneous catalyst synthesized from natural kaolin into sodalite via hydrothermal process. The synthesized catalyst was characterized using XRD, FTIR and SEM-EDS, confirming the transformation of kaolinite to sodalite. The transesterification reaction was conducted under varying methanol-to-oil molar ratios (1:12, 1:18, and 1:24) and temperatures (60, 65, and 70°C). A Taguchi orthogonal array (L9) was employed to statistically evaluate the effects of these parameters on methyl ester yield. Experimental results showed that both methanol ratio and reaction temperature significantly influenced biodiesel yield, with the highest yield of 90.44% obtained at 70°C and 1:18 molar ratio. Signal-to-noise ratio and ANOVA analysis indicated that the methanol-to-oil ratio was the most dominant factor (46.05%) compared to temperature (40.55%). The resulting biodiesel exhibited a flash point of 158°C, acid value of 0.06 mg-KOH/g, and iodine value of 84.06 g-I₂/100g, satisfying most ASTM D6751 and SNI 7182:2015 standards, though viscosity and density exceeded standard limits. Emission testing showed 16% reduction in CO emissions with increasing biodiesel blends, while NO and NOx emissions slightly increased.

APPLICATION OF NUMERICAL MODELING TO PIPE LEAKS IN FLUID FLOW Ilmah, Aurista Miftahatul; Syarifuddin, Arief; Risdianto, Anauta Lungiding Angga
Jurnal Informatika dan Teknik Elektro Terapan Vol. 12 No. 1 (2024)
Publisher : Universitas Lampung

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.23960/jitet.v12i1.3954

Pipes are a medium used to move flowing fluids and are very dependent on pressure and speed. Leaks in pipes can cause physical loss of water. This can be caused by many things, one of which is a leak caused by a hole in the pipe which can disrupt the flow of water so that the flow of water or fluid will change, including the pressure and speed. A fluid flow can be visualized using simulation or mathematical modeling using finite differences. By using the GNU Octave application, namely numerical computing which can be accessed for free without a license which is used as data visualization, it can provide an overview of fluid flow including the occurrence of leaks in pipes, namely by visually representing the state of fluid flow when a leak occurs in a pipe. With this visualization, a fluid flow pattern is produced where leaks occur at several different points. From the research results, it was found that the pipe before it got a leak would be laminar, but when it got a leak, the fluid flow would become a fluid flow that switched to transitional fluid flow or turbulence. Apart from that, the placement of coordinate variations slightly affects the fluid flow line

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