Optimizing Bi2O3 and TiO2 to achieve the maximum non-linear electrical property of ZnO low voltage varistor

In fabrication of ZnO-based low voltage varistor, Bi2O3 and TiO2 have been used as former and grain growth enhancer factors respectively. Therefore, the molar ratio of the factors is quit important in the fabrication. In this paper, modeling and optimization of Bi2O3 and TiO2 was carried out by response surface methodology to achieve maximized electrical properties. The fabrication was planned by central composite design using two variables and one response. To obtain actual responses, the design was performed in laboratory by the conventional methods of ceramics fabrication. The actual responses were fitted into a valid second order algebraic polynomial equation. Then the quadratic model was suggested by response surface methodology. The model was validated by analysis of variance which provided several evidences such as high F-value (153.6), very low P-value (<0.0001), adjusted R-squared (0.985) and predicted R-squared (0.947). Moreover, the lack of fit was not significant which means the model was significant

INVESTIGATION ON EFFECTS OF BLENDING RATIO AND TEMPERATURE ON SYNGAS QUALITY AND PERFORMANCE OF CO-GASIFICATION

Gasifier has been proven feasible for the generation of electricity. Reliance on single biomass especially for seasonal crops can lead to disruptions in gasification. Hence, co-gasification with different biomass is proposed to ensure a continuous biomass supply for power generation. By considering low-cost biomass supply and non-seasonal crops such as coconut shell (CS) as a biomass feedstock. In this study, CS is used as a primary fuel due to its good physicochemical properties. CS is co-gasified with corn residues (CR) and grass (G) to study the quality of syngas and performance of co-gasification at various biomass blending ratio (20:80, 50:50, 60:40.) and temperature 700-900ºC

INVESTIGATION ON EFFECTS OF BLENDING RATIO AND TEMPERATURE ON SYNGAS QUALITY AND PERFORMANCE OF CO-GASIFICATION

Gasifier has been proven feasible for the generation of electricity. Reliance on single biomass especially for seasonal crops can lead to disruptions in gasification. Hence, co-gasification with different biomass is proposed to ensure a continuous biomass supply for power generation. By considering low-cost biomass supply and non-seasonal crops such as coconut shell (CS) as a biomass feedstock. In this study, CS is used as a primary fuel due to its good physicochemical properties. CS is co-gasified with corn residues (CR) and grass (G) to study the quality of syngas and performance of co-gasification at various biomass blending ratio (20:80, 50:50, 60:40.) and temperature 700-900ºC

Flow of Water-Oil Emulsion through an Orifice

The oil-in-water (O/W) and water-in-oil (W/O) emulsions are two common types of emulsions found in oil production industry. While stable O/W may be beneficial in transporting crude oil, stable W/O poses a flow assurance problem that leads to disruptions and losses in oil production line. This study examines the behaviour of both types of emulsion (40:60, 50:50 and 60:40 water-oil emulsion, vol. basis) subjected to 3/4D, 1/2D and 1/4D orifices within a pipeline. The study confirms that oil and water may form emulsion with only mechanical agitation and dynamic flow in the pipeline and without the presence of any emulsifying agent. The flow rate and the velocity of all emulsions were found to drop with the reduction of orifice diameter