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Hasil Pencarian

Ditemukan 2 dokumen yang sesuai dengan query
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Handi
"Mesin bubut merupakan mesin perkakas yang banyak digunakan untuk memproduksi bentuk benda putar atau silindris. Suatu kondisi yang bisa terjadi dan berpengaruh terhadap mesin bubut itu sendiri, serta terhadap kualitas komponen atau produk yang dihasilkan adalah inasalah timbulnya getaran pada pahat potong. Getaran ini sangat merugikan dan sedapat mungkin dikurangi atau dihilangkan, melalui tahap awal dalam suatu rancangan mesin perkakas dengan meningkatkan kekakuan dinamik atau dengan menambah suatu sistem redaman sebagai alat tambahan. Suatu peredam getar sistem pegas-massa dibuat untuk mengurangi getaran eksitasi-mandiri.
Mesin bubut model C6232A1 dirancang untuk membubut permukaan luar silinder, dengan benda kerja yang digunakan adalah besi-cor, kuningan, aluminium-cor, Fe-50 dan stainless-steel. Penelitian yang dilakukan terhadap mesin bubut ini adalah pengukuran terhadap simpang-getar pada pahat potongnya. Karakteristik pemotongan terhadap benda kerja tersebut dengan kecepatan spindle 50, 105, 130, 180, 260. 360 dan 560 rpm. Semakin tinggi kecepatan spindle, simpang getar yang timbul semakin naik. Pada proses penyeiesaian hal tersebut perlu dihindari, atau paling tidak diturunkan hingga pada batas tertentu, dengan suatu alat peredam sehingga benda kerja yang dihasilkan mempunyai kualitas permukaan yang lebih baik. Suatu analisa dilakukan menggunakan mesin bubut dan benda kerja dengan jenis yang berbeda untuk membuktikan apakah terjadi penurunan sim pang getar pada ujung pahat mesin bubut tersebut.
Adapun basil penelitian ini terdapat penurunan simpang getar rata-rata untuk besi-cor 37,7%, kuningan 39,1%, aluminium-cor 19,6%, Fe-50 34,6% dan stainless-steel 31,3%. Tingkat kekasaran permukaan yang lebih baik. Dengan diturunkannya simpang getar pada masing-masing benda kerja maka dapat diketahui bahwa ini adalah sistim over-damped."
Depok: Fakultas Teknik Universitas Indonesia, 2000
T2799
UI - Tesis Membership  Universitas Indonesia Library
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Maurice Efroza Handi
"PET plastic bottle waste and biomass are an urgent environmental pollution problem due to their abundance. Through circular economy, more than reducing pollution, waste materials and polymers can be increased in value through recycled synthesis into advanced materials. Amorphous carbon was obtained through a pyrolysis process at 400 oC for 2 hours from PET plastic bottle waste. To improve carbon performance, activation was carried out using a strong base KOH with variations of KOH to the number of carbons of 1:2, 1:3, 1:4 to obtain activated carbon with high surface area and conductivity. The activated carbon that was successfully synthesized was then subjected to XRD (X-Ray Diffraction) and BET (Brunauer Emmett Teller) characterization tests. The flash joule process will be carried out using an artificial apparatus that uses a power supply, capacitor and quartz tube as a synthesis site. Through a capacitor and power supply, high voltage electricity can be delivered to the activated carbon that has been placed in the quartz tube. This process only takes about 1-2 seconds because the hot plasma process does not require a long time to synthesize turbostratic graphene produced by this flash joule process. The synthesized turbostratic flash joule graphene was then subjected to SEM (Scanning Electron Microscopy), EDS (Energy Dispersive Spectroscopy), XRD (X-Ray Diffraction), BET (Brunauer Emmett Teller), Raman Spectroscopy, and Fourier Transformation Infrared Spectroscopy (FTIR) characterization tests.

PET plastic bottle waste and biomass are an urgent environmental pollution problem due to their abundance. Through circular economy, more than reducing pollution, waste materials and polymers can be increased in value through recycled synthesis into advanced materials. Amorphous carbon was obtained through a pyrolysis process at 400 oC for 2 hours from PET plastic bottle waste. To improve carbon performance, activation was carried out using a strong base KOH with variations of KOH to the number of carbons of 1:2, 1:3, 1:4 to obtain activated carbon with high surface area and conductivity. The activated carbon that was successfully synthesized was then subjected to XRD (X-Ray Diffraction) and BET (Brunauer Emmett Teller) characterization tests. The flash joule process will be carried out using an artificial apparatus that uses a power supply, capacitor and quartz tube as a synthesis site. Through a capacitor and power supply, high voltage electricity can be delivered to the activated carbon that has been placed in the quartz tube. This process only takes about 1-2 seconds because the hot plasma process does not require a long time to synthesize turbostratic graphene produced by this flash joule process. The synthesized turbostratic flash joule graphene was then subjected to SEM (Scanning Electron Microscopy), EDS (Energy Dispersive Spectroscopy), XRD (X-Ray Diffraction), BET (Brunauer Emmett Teller), Raman Spectroscopy, and Fourier Transformation Infrared Spectroscopy (FTIR) characterization tests."
Depok: Fakultas Teknik Universitas Indonesia, 2022
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UI - Skripsi Membership  Universitas Indonesia Library