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All Journal Journal of Engineering and Technological Sciences Akubis: Jurnal Akuntansi dan Bisnis
Daniel Prasetyo, Daniel
Department of Chemical Engineering, Faculty of Industrial Technology Institute of Technology Bandung, Jl. Ganesha 10, Bandung, 40132
Economics, Econometrics & Finance Engineering

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Molecular Weight and Structural Properties of Biodegradable PLA Synthesized with Different Catalysts by Direct Melt Polycondensation Lee, Hyung Woo; Insyani, Rizki; Prasetyo, Daniel; Prajitno, Hermawan; Sitompul, Johnner P.
Journal of Engineering and Technological Sciences Vol 47, No 4 (2015)
Publisher : ITB Journal Publisher, LPPM ITB

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (261.643 KB) | DOI: 10.5614/j.eng.technol.sci.2015.47.4.2

Abstract

Production of biodegradable polylactic acid  (PLA)  from biomassbased lactic acid is widely studied for substituting petro-based plastics  or polymers. This study investigated PLA production from commercial lactic acid in a batch reactor by applying a direct melt polycondensation method with two kinds of catalyst,  γ-aluminium(III)  oxide  (γ-Al2O3) or  zinc oxide (ZnO),  in reduced pressure. The molecular weight of the synthesized PLA was determined by capillary viscometry and its structural properties were analyzed by functional group analysis using FT-IR. The yields of polymer production with respect to the theoretical conversion were 47% for γ-Al2O3 and 35% for ZnO. However, the PLA from ZnO had a higher molecular weight (150,600 g/mol) than that from γ-Al2O3 (81,400 g/mol). The IR spectra of the synthesized PLA from both catalysts using polycondensation show the same behavior of absorption peaks at wave numbers from 4,500 cm-1 to 500 cm-1, whereas the PLA produced by two other polymerization methods – polycondensation and ring opening polymerization –showed a significant difference in % transmittance intensity pattern as well as peak area absorption at a wave number of 3,500 cm-1 as –OH vibration peak and at 1,750 cm-1 as –C=O carbonyl vibrational peak.
PERBANDINGAN ANALISA FUNDAMENTAL DAN TEKNIKAL DALAM PERDAGANGAN MATA UANG USD/JPY SETELAH PERISTIWA NON FARM PAYROLL Limanto Angka, Andrew; Joyo Negoro Octavianus, Rony; Prasetyo, Daniel
Akubis: Jurnal Akuntansi dan Bisnis Vol. 3 No. 01 (2018): AKUBIS: Jurnal Akuntansi dan Bisnis
Publisher : Lembaga Penelitian dan Pengabdian Masyarakat Universitas Katolik Widya Karya Malang

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (380.214 KB) | DOI: 10.37832/akubis.v3i01.38

Abstract

This research was conducted to analyze the comparison of the results of the trading on the currency pair USD/JPY one hour after Non Farm Payroll?s release time using fundamental analysis,  Stochastic  Oscillator  technical  analysis,  ADX technical analysis, and combination of technical analysis during the period January 2015 to November 2016. Sampling technique used was the comparative analysis put forward by the Nazir (2005) where the purpose of the comparative analysis is to compare between the two groups in one or more variables. The research results showed that fundamental analysis has the return (in pips) which is the highest among the four others analysis. In the technical category, Stochastic Oscillator technical analysis has the highest number (in pips) of return than ADX technical analysis as well as combination of technical analysis.
Co-Authors Hermawan Prajitno, Hermawan Hyung Woo Lee Johnner P. Sitompul Joyo Negoro Octavianus, Rony Limanto Angka, Andrew Rizki Insyani