Three dimensional shaping of ceramics by using CO2 laser and its optimum processing condition

1990 ◽  
Author(s):  
A. Kitagawa ◽  
A. Matsunawa
Keyword(s):  
Co2 Laser ◽  
Processing Condition ◽  
Three Dimensional ◽  
Optimum Processing ◽  
Optimum Processing Condition

High Temperature Deformation Behavior of Strip-Cast AZ31 Mg Alloy

2006 ◽  
Vol 15-17 ◽  
pp. 461-466
Author(s):  
B.H. Lee ◽  
Won Kyu Bang ◽  
Sang Ho Ahn ◽  
Chong Soo Lee
Keyword(s):  
High Temperature ◽  
Processing Map ◽  
Microstructural Analysis ◽  
Processing Condition ◽  
Mg Alloy ◽  
Temperature Deformation ◽  
Maximum Efficiency ◽  
Optimum Processing ◽  
Az31 Mg Alloy ◽  
Strip Cast

In this study, optimum processing conditions for strip-cast AZ31 Mg alloy was investigated on the basis of processing map and microstructural analysis. To obtain the processing map, isothermal compression tests were carried out to a strain of 0.5 at temperatures of 200 ∼ 400°C with the strain rates of 0.01 ∼ 10s-1. It was found that maximum efficiency indicating the optimum processing condition occurred at 300°C and 10s-1. The possible deformation mechanisms operating at high temperature was also discussed.

scholarly journals Optimasi Proses Pembuatan Mi Sorgum Dengan Menggunakan Ekstruder Ulir Ganda (Optimization of Sorghum Noodle Processing with Twin Screw Extruder)

1970 ◽  
Vol 3 (1) ◽  
pp. 1-7
Author(s):  
Tjahja Muhandri ◽  
Subarna Subarna ◽  
Ivan Mustakim
Keyword(s):  
Response Surface Methodology ◽  
Optimum Condition ◽  
Processing Condition ◽  
Cooking Loss ◽  
Optimum Process ◽  
Twin Screw Extruder ◽  
Screw Extruder ◽  
Screw Speed ◽  
Twin Screw ◽  
Optimum Processing Condition

The objective of this research was to optimize the sorghum noodle processing with two variables i.e. extruder temperature (80, 85, 90oC) and screw speed (10, 15, 20 Hz). The optimum process was chosen by using Response Surface Methodology (RSM), based on 2 parameters, i.e. cooking loss and elongation. The result of this research showed that the optimum processing condition with desirability of 0.736, was resulted from the combination of the extruder temperature of 85oC and screw speed of 20 Hz. The verification showed that the sorghum noodles from this optimum condition had cooking loss of 11.87 %, and elongation of 234.84.  Keywords: noodle, sorghum, optimization, twin screw extruder, RSM

scholarly journals Optimum Processing and Tool Controls for Three-Dimensional Friction Stir Welding

2008 ◽  
Vol 49 (8) ◽  
pp. 1911-1914 ◽  
Author(s):  
Hironori Takahara ◽  
Masato Tsujikawa ◽  
Sung-Wook Chung ◽  
Yuzo Okawa ◽  
Sachio Oki ◽  
...  
Keyword(s):  
Friction Stir Welding ◽  
Three Dimensional ◽  
Friction Stir ◽  
Optimum Processing

Optimized Processing Condition for a Photocrosslinkable Stable Nonlinear Optical Polymer

1990 ◽  
Vol 214 ◽  
Author(s):  
Jun Y. Lee ◽  
Woo H. Kim ◽  
Braja K. Mandal ◽  
Jayant Kumar ◽  
Sukant K. Tripathy
Keyword(s):  
Nonlinear Optical ◽  
Processing Condition ◽  
Polymeric System ◽  
Nonlinear Optical Material ◽  
Optical Polymer ◽  
Temperature Rate ◽  
Set Up ◽  
Vinyl Cinnamate ◽  
Nonlinear Optical Polymer ◽  
Optimum Processing Condition

ABSTRACTThe optimum processing condition for a photocrosslinking Nonlinear Optical(NLO) polymeric system was established. Parameters such as change in heat capacity at glass transition temperature, rate of decrease of absorbance of residual uncrosslinked chromophores, and measurement of mass loss upon heating were used to set up the optimum condition. Poly(vinyl cinnamate) was used as the photocrosslinkable polymer and 3- cinnamoyloxy-4-[4-(N, N-diethylamino)-2-cinnamoyloxy phenyl azo] nitrobenzene was used as the NLO molecule. Poling at 70°C for 5 minutes followed by photocrosslinking with a dose of 2.5 mW/cm 2 for 10 minutes results in a stable second order nonlinear optical material.

Experimental Study of Glass Ceramics from Liquid Hematite Slag

2011 ◽  
Vol 194-196 ◽  
pp. 2082-2085
Author(s):  
Yi Miao Nie ◽  
Fu Sheng Niu ◽  
Jin Xia Zhang
Keyword(s):  
Processing Condition ◽  
Glass Ceramics ◽  
Ecological Environment ◽  
Crystallization Time ◽  
Land Resources ◽  
Microcrystalline Structure ◽  
Severe Damage ◽  
X Ray ◽  
Save Energy ◽  
Optimum Processing Condition

Much slag occupied the land resources and caused severe damage to the ecological environment. A lot of work has been done on the reclaimation and utilization of slag. The composition, type and characteristics of slag were similar in some way to glass ceramics, which are architectural decoration materials or wearable and corrosion-proof materials with high quality and low price. In this paper, glass ceramics was prepared using hematite slag, which has not been cooled down in order to save energy. The optimum processing condition determined by orthogenesis test to prepare glass ceramics was hematite78.16%, CaF23.91%, CaO7.77%, coke10.16%.The smelting temperature is 1550 for 60 min and the crystallization time is 90 min. Microstructure analysis was studied by SEM. The microcrystalline structure was many petals, which was diopside crystal proved by X-ray analysis.

scholarly journals Physicochemical properties, kinetics and thermodynamic studies of polyphenol oxidase from sorghum (Sorghum bicolor (L.) Moench) for potential use in industry

2019 ◽  
Vol 18 (2) ◽  
pp. 102-117
Author(s):  
Toluwase Hezekiah Fatoki ◽  
David Morakinyo Sanni
Keyword(s):  
Sorghum Bicolor ◽  
Polyphenol Oxidase ◽  
Processing Condition ◽  
Residual Activity ◽  
Processing Parameters ◽  
Size Exclusion ◽  
Average Value ◽  
Exclusion Chromatography ◽  
Optimum Processing Condition ◽  
Potential Use

Abstract Advances Polyphenol Oxidase (PPO) from Sorghum bicolor (white and yellow varieties) grains were investigated for optimum processing condition. The partially purified enzyme was obtained from two varieties of Sorghum bicolor by step-wise separation through ion-exchange and size-exclusion chromatography. The final purification gave a yield of 7.33 % and 12.3 % for PPO from white and yellow sorghum respectively. The PPO has Vmax and Km of 2.66 U.mL−1 and 19.72 mM for white sorghum, 1.33 U.mL−1 and 12.92 mM for yellow sorghum. The optimal pH of PPO activity was found at pH 4 and pH 7 for white and pH 4 and pH 8 for yellow sorghum. The pKa 7.4 and 8.7 were obtained for PPO from white sorghum, and pKa 5.4, 7.4 and 8.5 for yellow sorghum. The PPO residual activity were above 70 % at 5 hours of incubation within the neutral pH ranges for white sorghum, while those of yellow sorghum were below 40 %. The optimum temperature of 40 ºC and 30 ºC for white and yellow sorghum PPO respectively. The average value of enthalpy (ΔH), entropy (ΔS) and Gibbs free energy (ΔG) obtained at 20 min of incubation and temperature 50 – 80 °C were respectively 49.03 kJ.mol−1, - 129.52 J.mol−1.K−1, and 92.81 kJ.mol−1 for white sorghum PPO, and 90.1 kJ.mol−1, - 9.29 J.mol−1.K−1, and 93.37 kJ.mol−1 for yellow sorghum PPO. Zn2+, Fe2+ and ascorbic acid inhibited PPO while Cu2+, Na+ and K+ activated the enzyme. The results suggest the processing parameters for controlling PPO in potential industrial application of white and yellow sorghum grains.

Net shaping via aluminium foaming

2003 ◽  
Vol 217 (2) ◽  
pp. 193-199 ◽  
Author(s):  
Y P Kathuria
Keyword(s):  
Pore Size ◽  
Processing Speed ◽  
Processing Condition ◽  
Three Dimensional ◽  
Pilot Scale ◽  
Scale Production ◽  
Precursor Material ◽  
Small Pore ◽  
Fast Processing ◽  
Net Shaping

The marriage between net shaping and aluminium alloy foaming has given a new dimension to the rapid prototyping technique for manufacturing of the lightweight structure in the automotive and aerospace industries. The present paper is focused on laser-assisted aluminium foaming from a foamable precursor material and its possible applications in net shaping of three-dimensional structures. Preliminary results suggest that a pore size gradient and a density gradient exist in the structure as the processing condition changes. The foam has large pores and lower density for slow processing speed, in contrast with the fast processing speed with small pore size but higher density. For pilot-scale production of the foamed plates, sandwiches panel and localized foamed structure, specially intended for heat exchanger in the electronic industries, the laser foaming technique may be the most appropriate.

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