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Full-Text Articles in Engineering
Chemical Synthesis, Characterisation And Gas Sensing Performance Of Copper Oxide Nanoribbons, Xing L. Gou, Guoxiu Wang, Juan Yang, Jinsoo Park, David Wexler
Chemical Synthesis, Characterisation And Gas Sensing Performance Of Copper Oxide Nanoribbons, Xing L. Gou, Guoxiu Wang, Juan Yang, Jinsoo Park, David Wexler
Faculty of Engineering - Papers (Archive)
Single crystalline copper oxide nanoribbons were synthesized via a surfactant-assisted hydrothermalroute. The resulting CuO nanoribbons contain substantial amounts of nanorings and nanoloops. Highresolution TEM analysis identified CuO nanoribbons growing along the [010] direction. CuOnanoribbons exhibited excellent sensing performance towards formaldehyde and ethanol vapours withrapid response and high sensitivity at low operating temperatures. We found that the loading of a smallamount of Au or Pt nanoparticles on the surface of CuO nanoribbons can effectively enhance andfunctionalize the gas sensing performance of CuO nanoribbons.
Gas Drainage Improvement In Underground Coal Mines, Dennis John Black, Naj Aziz
Gas Drainage Improvement In Underground Coal Mines, Dennis John Black, Naj Aziz
Faculty of Engineering and Information Sciences - Papers: Part A
Effective gas management is vital to the success of the longwall mining in the Bulli seam, in the Southern Coalfield, Sydney Basin, NSW, Australia. The evolution of gas drainage methods and practices are discussed with respect to gas type, gas drainage lead time and prevailing geological conditions. Both underground to inseam drilling and surface to inseam drilling techniques are described at both pre and post-drainage conditions. Post-drainage of gas from longwall is discussed for its effectiveness, practicability and efficiency. The long term benefit of the method selected is examined with respect to gas capture efficiency. An alternative method of surface …
The Evolution In Coal Mine Gas Extraction - A Response To Economic, Environmental And Community Pressures, Dennis John Black, Naj Aziz
The Evolution In Coal Mine Gas Extraction - A Response To Economic, Environmental And Community Pressures, Dennis John Black, Naj Aziz
Faculty of Engineering and Information Sciences - Papers: Part A
Effective gas management is vital to the success of the longwall mines operating in the Bulli seam, located in the Southern Sydney Basin, Australia. High gas emissions are characteristic of the region with specific gas emissions typically in the order of 30-45 m3/t. The mines that operate in this area have, since 1980, relied on the use of extensive underground to inseam (UIS) drilling to drain gas both ahead of advancing roadway development and following longwall coal extraction. With the ever increasing production capacity of modern mining machinery the UIS methods are struggling to drain sufficient gas from the coal …
Improving Uis Gas Drainage In Underground Coal Mines, Dennis John Black, Naj Aziz
Improving Uis Gas Drainage In Underground Coal Mines, Dennis John Black, Naj Aziz
Faculty of Engineering and Information Sciences - Papers: Part A
Gas drainage is considered one of the most effective controls in preventing coal and gas outbursts. The advances in mining equipment technology over the last 20 years have led to a significant increase in coal mine production, resulting in increased coal mine gas emission during the coal extraction process. High gas emissions, if not effectively managed, may exceed the diluting capability of the mine's ventilation system, potentially exceeding the statutory limit, resulting in gas related production delays. The development of underground to inseam (UIS) gas drainage is discussed. The study is focused on a range of factors which impact gas …
Influence Of Shielding Gas On Fume Size Morphology And Particle Composition For Gas Metal Arc Welding, Kristin R. Carpenter, Brian J. Monaghan, John Norrish
Influence Of Shielding Gas On Fume Size Morphology And Particle Composition For Gas Metal Arc Welding, Kristin R. Carpenter, Brian J. Monaghan, John Norrish
Faculty of Engineering - Papers (Archive)
Shielding gas is an important parameter in Gas Metal Arc Welding (GMAW). Nevertheless, the influence of shielding gas on particle composition and size distribution of welding aerosols is not clearly understood. Increasing the O2 or CO2 content of Ar-based shielding gases resulted in an increase in the average particle size. For binary and ternary Ar, CO2, O2 mixtures, increasing CO2 had a greater impact than raising O2 on particle size. Variations in ArHeCO2 mixtures had the least influence. For 100% CO2, the particle size distribution was altered significantly due to the change of the weld transfer mode to globular and …
Iron Ore Reduction With Co And H2 Gas Mixtures – Thermodynamic And Kinetic Modelling, Raymond J. Longbottom, Leiv Kolbeinsen
Iron Ore Reduction With Co And H2 Gas Mixtures – Thermodynamic And Kinetic Modelling, Raymond J. Longbottom, Leiv Kolbeinsen
Faculty of Engineering - Papers (Archive)
The reduction of iron ore pellets has been studied using different techniques. Thermodynamic studies, experi-mental investigations and mathematical modelling have all been undertaken to better understand the behaviour of different pellet types in the new direct reduction process. The mathematical pellet model gives a good fit to most of the experimental conditions used in this work. There are some discrepancies between the experimental and calculated results under certain conditions, which are thought to be due to limitations in the experimental set up rather than fundamental issues in the model. The micromodel indicates that the hematite within the pellets is reduced …