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Denny Lesmana,Faizal Arifurrahman,Amer Hameed,G. J. Appleby-Thomas,Sigit P. Santosa 대한기계학회 2020 JOURNAL OF MECHANICAL SCIENCE AND TECHNOLOGY Vol.34 No.5
The behaviour of exposed and copper-jacketed 12.7 mm En8 steel cores impacting against 5 and 9 mm Armox Advance plates was investigated to determine the significance of the jacket during the penetration. The target plates were accelerated into stationary projectiles (a reversed-ballistic configuration) and the impact was monitored using a multichannel flash X-ray system to gain insight into the interaction of the core target. Numerical simulations were also carried out to compare result with the experimental testing. Explicit numerical software LS-DYNA was used to model the behaviour of the target and the projectile during the impact collision. Fragments of the core and target plate were collected post-shot for analysis. A similar penetration behaviour was observed for both plates, although the post-shot core was shorter after impacting against the 9 mm plate, consistent with enhanced erosion behaviour. The copper jacket protected the core, resulting in greater surface defeat and dwell compared to the unjacketed core. Numerical studies agreed on the cases of projectile impacting the 5 mm and 9 mm target. However, the target fracture cannot be captured. This could be caused by the input of material data and strain rate parameter modelling in LS-DYNA was limited, while the impact phenomenon was high velocity impact that the material exhibits a highstrain rate effect. Overall, the ductile jacket appeared to serve two functions: (1) Absorbing reflected energy during impact, hence cushioning the impact and thereby preserving the core, and (2) constraining or confining the core. In this study, the steel core design and copper jacket has a more complex geometry compared to the simplified steel core designs often applied in several earlier ballistic studies. The captured flash X-rays revealed significantly less erosion in the jacketed cores, agreeing with the post-impact core length measurements.
Yarn dyed wastewater treatment using hybrid electrocoagulation-Fenton method in a continuous system
Denny Gunawan,Vincensius Billy Kuswadi,Lanny Sapei,Lieke Riadi 대한환경공학회 2018 Environmental Engineering Research Vol.23 No.1
Yarn dyed wastewater has to be treated prior to disposal into the water bodies due to its high content of harmful organic compounds. In this study, the performance of Chemical Oxygen Demand (COD) removal and kinetic rate constant are investigated via hybrid electrocoagulation-Fenton in a continuous system using wastewater discharged from a yarn dyed industry in Surabaya city. The wastewater was treated in a batch mode using electrocoagulation to reduce Total Suspended Solid, followed by Fenton method in a continuous system to reduce COD level. Various Fe(II) feeding modes, molar ratio of Fe(II)/H₂O₂, initial pH of wastewater, and flow rate are used in this study. The results show that COD removal process obeys a pseudo-first order kinetics. At Fe(II)/H₂O₂ ratio of 1:10, initial wastewater pH of 3.0, and feed flow rate of 30 mL/min, the COD removal efficiency was observed to be 80%, and the kinetic rate constant is 0.07046 min-1. The chemical cost for the treatment estimated to be IDR 160 per L wastewater, which is cheaper than the previously reported batch system of IDR 256/L.
Denny Juvi,Sthefanie,Marcelia Sugata,Jap Lucy,Danish Andrian,Denny Rizkinata,Michelle,Tan Tjie Jan 한국미생물·생명공학회 2019 한국미생물·생명공학회지 Vol.47 No.2
The effect of microencapsulation on previously isolated Lactobacillus delbrueckii 94/L4 as starter culture for yogurt, and Lactobacillus casei 97/L3 as a probiotic candidate was investigated. Preliminary results showed that L. delbrueckii 94/L4 exhibited tolerance to bile, unlike L. casei 97/L3. Freeze drying significantly (p < 0.05) reduced the viability of both isolates by log 0.71−2.70. Although microencapsulation preserved the viability of L. casei 97/L3 cells exposed to simulated gastrointestinal tract conditions for 120 min, it did not impart significant (p < 0.05) protection against loss of viability during the first 30 min of exposure. Conversely, microencapsulated L. delbrueckii 94/L4 with the addition of Streptococcus thermophilus 24/S1 as starter culture was successfully incorporated into milk to form yogurt, yielding a significantly (p < 0.05) improved product quality.
Electrical, electronic and optical properties of amorphous indium zinc tin oxide thin films
Denny, Y.R.,Lee, K.,Seo, S.,Oh, S.K.,Kang, H.J.,Yang, D.S.,Heo, S.,Chung, J.G.,Lee, J.C. New York] ; North-Holland 2014 APPLIED SURFACE SCIENCE - Vol.315 No.-
The electrical and optical properties of amorphous indium zinc tin oxide (a-IZTO) thin films were examined as a function of chemical composition. Effects of Sn/Zn composition ratio and In content on the electrical and optical properties of a-IZTO thin films are discussed. The electron mobility of thin film transistors with higher Sn/Zn composition ratio was dramatically improved due to a shorter zinc-zinc separation distance. The thin film transistor with the composition of In:Zn:Sn=20:48:32 exhibits a high mobility of 30.6cm<SUP>2</SUP>V<SUP>-1</SUP>s<SUP>-1</SUP> and a high on-off current ratio of 10<SUP>9</SUP>.
FINE DYING : EXPERIMENTING PRACTICAL INTELLECTUAL
Denny Ho Kwok-leung,Yanki Lee,Albert Tsang Siu-Yin 한국디자인학회 2015 한국디자인학회 학술발표대회 논문집 Vol.2015 No.10
This paper draws on the important implications of Aristotle’s understanding of techne to design making, and on the other, to show how we attempt to apply our practical intellect and imagination to design. These two tasks are to establish the proper role of designers in design process about our everyday lives. Fine Dying is the first “possible design study”, which aims to encourage public to investigate our own dying matters through designing. Three tactics in this project were identified to manifest our imagination of the possibility of having happiness through designing our afterlife: a) the actualization of the ethics of recognition; b) allowing the matter of concerns visible and present in public; and c) the continuation of dialogue between designers/younger citizens, design partners/older people and the audience/on-lookers.