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Specta Journal of Technology
Published by Institut Teknologi Kalimantan
ISSN : 25492713     EISSN : 26229099     DOI : https://doi.org/10.0610/specta.v2i3
Core Subject : Science, Social, Engineering,
Chemical Engineering, Chemistry & Bioengineering Civil Engineering, Building, Construction & Architecture Computer Science & IT Electrical & Electronics Engineering Environmental Science
SPECTA journal is published by Lembaga Penelitian dan Pengabdian kepada Masyarakat, Institut Teknologi Kalimantan, Balikpapann Indonesia. SPECTA is an open-access peer reviewed journal that mediates the dissemination of academicians, researchers, and practitioners in the field of Physics, Mathematics, Mechanical Engineering, Electrical Engineering, Chemical Engineering, Materials and Metallurgy, Civil Engineering, Industrial Engineering, Naval Engineering, Urban Planning, Informatics, Information System, Environmental Engineering, and Ocean Engineering. SPECTA accepts submission from all over the world, especially from Indonesia.
Arjuna Subject : Teknik (semua kategori) - Teknik (Lain-Lain)
Articles 5 Documents
 1 
Search results for , issue "Vol. 3 No. 2 (2019): SPECTA Journal of Technology" : 5 Documents clear
Studi Metode Pendinginan Super Cepat untuk Pembentukan Bulk Metallic Glasses pada Paduan Cu45Zr45Al5Ag5 Andromeda Dwi Laksono; Rifqi Aulia Tanjung
SPECTA Journal of Technology Vol. 3 No. 2 (2019): SPECTA Journal of Technology
Publisher : LPPM ITK

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (757.56 KB) | DOI: 10.35718/specta.v3i2.41

Abstract

Bulk Metallic Glass (BMG) memiliki sifat mekanik, magnetik, kimia dan fisik yang berbeda dengan paduan polikristalin karena susunan internal atomnya yang tidak teratur. Sehingga, BMG memiliki kekuatan mekanik yang baik, kekerasan yang tinggi, ketahanan terhadap aus dan korosi yang tinggi, dan kehalusan permukaan yang baik. Berdasarkan sifat tersebut, BMG memiliki kelayakan yang menjanjikan di bidang industry. Dalam penelitian ini, metode pengecoran cetakan di tembaga digunakan untuk menyiapkan BMG paduan Cu45Zr45Al5Ag5. Paduan dileburkan ulang dengan pendinginan super cepat menggunakan mesin pendingin di bawah temperatur -25 oC. Dengan metode pengecoran cetakan di tembaga, sampel ukuran besar berbentuk batang dipotong dengan diameter 2 mm hingga 4 mm dan panjang 30 mm. Batang kemudian dipotong lagi menjadi spesimen berbentuk cakram. Untuk memastikan apakah sampel adalah BMG atau tidak, sampel dievaluasi dengan Scanning Electron Microscopy (SEM), Energy Dispersion Spectrometer (EDS), Differential Scanning Calorimetry (DSC), Electron Probe X-ray Micro Analyzer (EPMA), dan X -ray Difraction (XRD). Hasilnya dibahas dalam penelitian ini. Kata Kunci: Bulk Metallic Glasses, Cu45Zr45Al5Ag5, Pengecoran Cetakan di Tembaga.
Analisis Rangkaian Full Wave Rectifier dengan Filter Kapasitor, Pembagi Tegangan, Buffer dan Penguat Differensial pada Sensor Arus Andhika Giyantara; Vicky Mudeng; Rizky Ramadhani; Rizky Wulandari
SPECTA Journal of Technology Vol. 3 No. 2 (2019): SPECTA Journal of Technology
Publisher : LPPM ITK

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (1013.947 KB) | DOI: 10.35718/specta.v3i2.44

Abstract

Abstrak Penelitian ini menyajikan perancangan dan analisis sebuah sensor arus yang terdiri dari rangkaian penyearah gelombang penuh dengan filter kapasitor, pembagi tegangan, buffer, dan penguat diferensial. Metode yang digunakan untuk mengukur nilai arus pada sensor adalah dengan menetapkan salah satu resistor pada rangkaian pembagi tegangan sebagai resistor referensi (Rs). Metode ini didasarkan pada hukum Ohm dalam menentukan nilai arus yang melalui suatu jalur. Hasil percobaan yang dilakukan telah membuktikan teori yang disajikan. Kata Kunci: metode resistif, pengukuran arus, rangkaian sensor arus.
Studi Perencanaan Pembangkit Listrik Tenaga Sampah Pada TPA Sambutan Kota Samarinda Thorikul Huda
SPECTA Journal of Technology Vol. 3 No. 2 (2019): SPECTA Journal of Technology
Publisher : LPPM ITK

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (563.883 KB) | DOI: 10.35718/specta.v3i2.109

Abstract

Selama ini sampah selalu dianggap sebagai masalah yang lazim ditemukan pada wilayah perkotaan. Secara umum tata kelola sampah hanya memindahkan sampah dari tempat penampungan sementara (TPS) ke tempat pemrosesan akhir (TPA). Perkembangan teknologi yang semakin maju memberikan solusi alternatif pengolahan sampah menjadi sumber energi. Penerapan teknologi pengolahan sampah menjadi sumber energi terbarukan yaitu Pembangkit Listrik Tenaga Sampah (PLTSa) Kota Samarinda merupakan kota padat penduduk yang menghasilkan produksi sampah yang cukup besar. Sampah organik yang ditimbun akan mengalami proses dekomposisi secara anaerobik sehingga menghasilkan gas yang disebut dengan gas landfill yang dapat di konversikan menjadi energi listrik. Pada penelitian ini untuk mengkonversi gas landfill menggunakan teknologi gas engine dengan tipe janbacher J320 GS yang dapat meghasilkan listrik sebesar 1.063kW. Gas landfill yang dihasilkan pada TPA Sambutan Kota Samarinda mencapai nilai 684.693,866 pada tahun 2019 dan akan meningkat setiap tahunnya sampai dengan tahun 2034 dengan energi listrik yang dihasilkan 2.822.107,61 kWh pada tahun 2019 dan meningkat sampai dengan tahun 2034 dan Biaya investasi untuk pembangunan PLTSa yaitu sebesar Rp. 25.092.450.601 dengan analisis evaluasi investasi NPV= Rp.17.539.868.600, IRR= 19%, BCR= 1,672 dan PB= 3,4 Tahun. Dari hasil evaluasi tersebut diperoleh bahwa perencanaan PLTSa TPA Sambutan di Kota Samarinda dapat memenuhi kriteria kelayakan untuk dibangun.
Analisa Lingkungan Kerja Dan Kesehatan, Keselamatan Kerja ( K3) (Studi Kasus: PT. Asrindo Citraseni Satria) Muhammad Nur
SPECTA Journal of Technology Vol. 3 No. 2 (2019): SPECTA Journal of Technology
Publisher : LPPM ITK

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (573.885 KB) | DOI: 10.35718/specta.v3i2.151

Abstract

Asrindo Citraseni Satria is a service company engaged in various projects providing and leasing heavy equipment for various construction activities, providing services to wellbores such asDrilling Rigsand reworking oil wells, providing services on routine service and maintenance of oil wells, as part of corporate services for our clients in the oil and gas industry. Currently the company's drilling project is underway in the Outside and NDD Area (North Duri Development) PT. Chevron Paci fi c Indonesia. The results obtained are that the working environment at the company and the implementation of the health, safety (K3) program are still very weak. This is due to lack of employee awareness and employee non-compliance in carrying out programs that have been designed by the company. Therefore, research on the work environment and health, work safety (K3), from the analysis conducted using the FTA (method, isFault Tree Analysis)known that the factors causing occupational accidents due to human negligence and the scattered environment. Then the solution provided by researchers is that companies are expected to be more stringent in implementing programs that have been designed to improve employee performance and reduce work accidents at ACS companies. Keywords: FTA (Fault Tree Analysis), Work Accident, Occupational Health and Safety (K3)
Characterization of Bark-Midrib Fibers using Chemical Treatment Variations as Reinforcement in Bark-Midrib Fiber Composites Oliever Andrea Parusha; Muhammad Nurhidayatur Rozikin; Andromeda Dwi Laksono; Gusti Umindya Nur Tajalla; Nabilla Amalia Putri; Fitriana Maharani Fatchur Rochim
SPECTA Journal of Technology Vol. 3 No. 2 (2019): SPECTA Journal of Technology
Publisher : LPPM ITK

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (736.424 KB) | DOI: 10.35718/specta.v3i2.154

Abstract

Bark midrib are not fully utilized. Utilize the characterization of the fiber and process it into polymer composites with natural fiber reinforcement. The study was conducted using a variety of chemical treatments in the form of bark midribs without treatment, delignification treatment that is immersion using NaOH media concentration of 1%, 5%, 10% with 3 hours immersion time and bleaching treatment using H2O2 media 2% concentration with immersion time 30, 60 and 90 minutes. In obtaining suitable properties, tensile tests, impact tests, Scanning Electron Microscopy (SEM) images, and Fourier-Transform Infra-Red (FTIR) tests are performed. Optimal delignification treatment at 5% NaOH concentration with a tensile test value of 25.47 MPa (increasing 76.86%) and an impact test value of 11.95 kJ/m2 (increasing 11.45%). The optimal bleaching treatment at 90 minutes immersion with a tensile test value of 35.09 MPa (increased 36.36%) and impact test value of 13.77 kJ/m2 (increased 15.22%). The results of SEM images show that the bark midrib fiber composite without treatment has a lousy interface, delignification treatment with a reasonable good interface, and bleaching treatment with an excellent interface. FTIR test results showed that the bark midrib fiber composite without treatment had a cellulose component but hemicellulose and lignin levels still dominated. Based on the results of the study, bark midrib fiber with delignification chemical treatment using 5% NaOH for 3 hours followed by bleaching treatment using 2% H2O2 for 90 minutes is the treatment with the best results and then applied to a natural fiber composite product.

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