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| 1 | A discrete-event model to simulate the effect of truck bunching due to payload variance on cycle time, hauled mine materials and fuel consumption显示文摘Data collected from truck payload management systems at various surface mines shows that the payload variance is significant and must be considered in analysing the mine productivity,energy consumption,greenhouse gas emissions and associated cost.Payload variance causes significant differences in gross vehicle weights.Heavily loaded trucks travel slower up ramps than lightly loaded trucks.Faster trucks are slowed by the presence of slower trucks,resulting in‘bunching’,production losses and increasing fuel consumptions.This paper simulates the truck bunching phenomena in large surface mines to improve truck and shovel systems’efficiency and minimise fuel consumption.The study concentrated on completing a practical simulation model based on a discrete event method which is most commonly used in this field of research in other industries.The simulation model has been validated by a dataset collected from a large surface mine in Arizona state,USA.The results have shown that there is a good agreement between the actual and estimated values of investigated parameters. | A.Soofastaei S.M.Aminossadati M.S.Kizil P.Knights | 2016 | International Journal of Mining Science and Technology2016，26，5： | 1 |
| 2 | Gain-enabled optical delay readout unit using CMOS-compatible avalanche photodetectors显示文摘A compact time delay unit is fundamental to integrated photonic circuits with applications in,for example,optical beam-forming networks,photonic equalization,and finite and infinite impulse response optical filtering.In this paper,we report a novel gain-enabled delay readout system using a tunable optical carrier,low-frequency RF signal and CMOS-compatible photodetectors,suitable for silicon photonic integration.The characterization method relies on direct phase measurement of an input RF signal and thereafter extraction of the delay profile.Both integrated silicon and germanium photodetectors coupled with low-bandwidth electronics are used to characterize a microring resonator-based,true-time delay unit under distinct ring–bus coupling formats.The detectors,used in both linear and avalanche mode,are shown to be successful as optical-to-electrical converters and RF amplifiers without introducing significant phase distortion.For a Si–Ge separate-absorption-charge-multiplication avalanche detector,an RF amplification of 10 dB is observed relative to a Ge PIN linear detector.An all-silicon defect-mediated avalanche photodetector is shown to have a 3 dB RF amplification compared to the same PIN detector.All ring delay measurement results are validated by full-wave simulation.Additionally,the impact of photodetector biasing and system linearity is analyzed. | RANJAN DAS YANRAN XIE HENRY FRANKIS KERU CHEN HERMANN RUFENACHT GUILLAUME LAMONTAGNE JONATHAN D.B.BRADLEY ANDREW P.KNIGHTS | 2022 | Photonics Research2022，10，10： | 0 |
| 3 | A study of mining fatalities and coal price variation显示文摘It has long been postulated that a relationship exists between commodity price cycles and fatalities in the mining industry.Previous studies have found only weak correlations in this area.This study analyses the fatalities recorded in coal mines over the period 1985-2016 in the State of Queensland as a function of thermal coal price variation.The study finds that the relationship between fatalities and coal prices is not linear.One to two fatalities occur in most years independent of the thermal coal price.When the price of coal falls below AUD 55/tonne(non-inflation adjusted),the likelihood of an incident involving multiple fatalities increases.The probability can be estimated at 2 in 18 events(equivalent to 11%).This paper postulates that in difficult economic times,mining companies react by downsizing direct employees.If not carefully managed,this can result in loss of knowledge around safety systems,and reduced effectiveness of safety supervision.Because of labour cost advantages,some jobs previously undertaken by direct employees will be replaced by contractors.Increased contractor numbers contribute to increased risk of fatalities occurring,as contractors are over-represented in accident categories involving vehicle accidents,tire handling and crushing incidents.Mine inspectorates,mining,and mining contractor companies need to be especially vigilant to enforce health and safety management systems during periods of low coal prices. | P.Knights B.Scanlan | 2019 | International Journal of Mining Science and Technology2019，29，4： | 0 |
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