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All Journal Rekayasa: Jurnal Penerapan Teknologi dan Pembelajaran Jurnal Pengelolaan Laboratorium Pendidikan Physics Communication Indonesian Journal of Laboratory International Journal of Research Innovation and Entrepreneurship
Muttaqin, Rodhotul
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Agriculture, Biological Sciences & Forestry Education Engineering Mathematics Mechanical Engineering Medicine & Pharmacology Physics Social Sciences

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Journal : Physics Communication

 1 
OPTIMALISASI WAKTU COATING PADA BAHAN KOMPOSIT ALAM UNTUK KARAKTERISASI MORFOLOGI DENGAN SCANNING ELECTRON MICROSCOPY (SEM) ENERGY DISPERSIVE X-RAY SPECTROSCOPY (EDX) Setyaningsih, Natalia Erna; Muttaqin, Rodhotul
Physics Communication Vol 1, No 2 (2017): August 2017
Publisher : Universitas Negeri Semarang

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (565.944 KB) | DOI: 10.15294/physcomm.v1i2.10777

Abstract

Komposit alam berbahan dasar daun jati telah dikembangkan di Universtas Negeri Semarang sebagai bahan alternatif pengganti kayu. Bahan komposit tersebut bersifat non konduktif sehingga untuk mengamati morfologinya dengan SEM (Scanning Electron Microscopy) diperlukan proses coating dengan menggunakan bahan konduktif seperti emas (Au) dan Palladium (Pd). Penelitian ini bertujuan untuk menentukan waktu coating optimal untuk sampel komposit alam. Metode yang digunakan adalah dengan variasi waktu coating yaitu 30 sampai 180 detik dengan penambahan 30 detik pada arus tetap 18 mA. Dari hasil SEM menunjukkan bahwa secara kualitatif waktu coating optimal untuk bahan komposit alam adalah 90 detik. Dari analisis EDX didapatkan penambahan waktu coating mengakibatkan penurunan persentase kandungan unsur bahan komposit alam. Hasil EDX pada waktu coating 90 detik diperoleh kandungan Carbon 10,7 %, Oksigen 1,4% dan Nitrogen 1% dan bahan pelapis Emas 85,5% dan Palladium 0,6%.
UJI BANDING KUALITAS CITRA RADIOGRAF SISTEM RADIOGRAFI DIGITAL MODIFIKASI TERHADAP COMPUTED RADIOGRAPHY SYSTEM DENGAN METODE CONTRASS TO NOISE RATIO Muttaqin, Rodhotul; Susilo, Susilo
Physics Communication Vol 1, No 1 (2017): February 2017
Publisher : Universitas Negeri Semarang

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (661.508 KB) | DOI: 10.15294/physcomm.v1i1.9000

Abstract

Modification of conventional radiography systems into a digital radiography system was conducted at the Laboratory of Physics Unnes. The image quality of digital radiography system that was developed in the Laboratory of Medical Physics Unnes need to be tested. The computed radiography (CR) system owned by Diponegoro National Hospital was chosen as a comparison with contrass to noise ratio (CNR) methode. Radiograph image generated by both radiography system then analyzed by software based on MATLAB. This study uses a copper plate phantom exposed to X-rays with a variation of anode-cathode voltage of 50 kV, 60 kV, 70 kV and 80 kV. For each voltage to vary the electrical current and expotion time of 1.6 mAs, 2.0 mAs, mAs 4.0, 8 mAs, 16 mAs and 32 mAs. Comparison of CNR for both systems to variations of tube voltage (kV) have a fixed value for the current and expotion time 4 mAs. Comparison of CNR for both systems to variations in current and ekspotion time (mAs) selected tube voltage 70kV.
Co-Authors Budi Astuti David Mubarok Dharma Putra, Ngurah Made Natalia Erna S. Nu'man, Agus NUR HAMID Prayitno, Wasi Sakti Wiwit Putut Marwoto Ratnasari, Fifin Dewi Setyaningsih, Natalia Erna Sugianto Sugianto Susilo Susilo Upik Nurbaiti