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Critical role of risk management in ground engineering and opportunities for improvement

International Journal of Mining Science and Technology 2017年第5期27卷 725-731页

作者： jim Galvin Mining Engineering University of New South WalesSydney 2283Australia

Green mining is concerned with mining in a sustainable manner, such that the needs of the present are met without compromising future generations. The achievement of this objective depends on balancing social, environmental and economic objectives and has to have regard to both active mining operations and legacy issues associated with mine closure. Ground engineering has a critical role in achieving green mining objectives but its contribution is characterised by pervasive uncertainty. Uncertainty equates to risk. This means that ground engineering should be practiced within a risk management framework that aims to both prevent unwanted outcomes and to mitigate their consequences to an acceptable level. This keynote address presents the fundamentals of risk management and demonstrates its effectiveness by reference to improvements in the safety performance of the NSw coal sector over the past three ***, ground control remains a mix of art and science, relying heavily on judgements which should be premised on knowledge, skill and experience(that is, competence). Risk management has now been enshrined in mining legislation and operating practice in Australia for over two *** this, near-hit and accident and incident investigations, commissions of inquiry and legal proceedings almost invariably identify deficiencies and opportunities for improvements necessary to achieve the objectives of sustainable mining. Three of the more important opportunities which have global application in relation to ground engineering are discussed. These relate to the vexing issue of defining competency in ground engineering; the criteria for undertaking rigorous risk assessment; and the need for ground engineers to become involved in mine rehabilitation and closure planning over the full life cycle of a mine, commencing at the prefeasibility stage.

关键词： Bow tie analysis Mine safety Mine closure Risk assessment Risk management Sustainable mining Uncertainty

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具有聚集诱导发光效应的聚炔材料的合成及光学性能研究

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化学学报 2016年第11期74卷 877-884页

作者：韩婷詹嘉慧林荣业唐本忠香港科技大学化学系国家人体组织功能重建工程技术研究中心香港分中心香港科技大学深圳研究院深圳518057

合成了三种含有四苯基乙烯结构的双炔烃．这些双炔烃单体通过在CuCl催化下在邻二氯苯中进行的均聚反应可以高产率地生成线型聚炔．所得聚合物均可很好地溶解于常见有机溶剂中，并具有很高的热稳定性．这类聚炔材料在溶液态时几乎不发光... 详细信息

合成了三种含有四苯基乙烯结构的双炔烃．这些双炔烃单体通过在CuCl催化下在邻二氯苯中进行的均聚反应可以高产率地生成线型聚炔．所得聚合物均可很好地溶解于常见有机溶剂中，并具有很高的热稳定性．这类聚炔材料在溶液态时几乎不发光，但在聚集态或者固态下可高度发光，表现出典型的聚集诱导发光性质．同时，这些聚合物具有高透光性，可以允许整个可见光区的光透过．其薄膜在4001700nm宽波长范围内表现出高折射率（n=1．7787-1．6543）和低色差（D＇=0．0003）．紫外光照射可诱使聚合物薄膜发生交联过程，从而调控其折射率数值，并可生成高分辨率的荧光图案．

关键词：线型聚炔聚集诱导发光四苯基乙烯折射率

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Interfacial tension studies between Fe-Cu-Ni sulfide and halo-norilsk basalt slag system

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Science China Earth Sciences 2005年第6期48卷 834-839页

作者： jim Mungall Department of Geology University of Toronto 22 Russell St Toronto Ontario M5S 3B1 Canada

The interfacial tension of the matte/halo-Norilsk basalt slag systems of FeS-Cu2S-Ni3S2 and FeO-FeS were investigated using the sessile drop technique. The results indicate that interfacial tension decreases with increasing copper and nickel contents in the matte of FeS-Cu2S-Ni3S2 system while it increases with increasing oxygen content in the matte of FeO-FeS system. It is inferred from these results that two conditions are critical for the formation of giant Cu-Ni sulfide deposits. One is that ma-fic-ultramafic parent magma of sulfide deposits should be rich in copper and nickel where due to the low interfacial tension, it is difficult to form sulfide droplet in the early stage of magma evolution. In other words, sulfide liquid conglomeration occurs more difficultly. The other condition is that the magma emplacement should be shallow; and a lot of faults occur in the magma emplacement field. Since oxygen content is high in the environment, interfacial tension is high, which helps sulfide liquid conglomeration and consequently Cu-Ni sulfide deposits form.

关键词： matte, slag, interfacial tension, Cu-Ni sulfide deposit.

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Turbulence modelling of the aerodynamic interaction ofOGV wakes and diffuser flow

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航空动力学报 2011年第10期26卷 2302-2312页

作者： Page Gary McGuirk jim Department of Aeronautical and Automotive Engineering Loughborough University

Different turbulence closures were used to predict the flow interaction between the wakes created by compressor outlet guide vanes(OGVs) and a downstream annular *** statistical turbulence models were tested based on the classical Reynolds-averaged Navier-Stokes(RANS) *** high-Re and low-Re(Launder-Sharma) versions of the k-ε model were applied to a selected test problem for OGV wake/diffuser *** test problem was specifically chosen because experimentally determined inlet conditions and both profile and performance data were available to validate predictions.A preliminary study was also reported of the more advanced large eddy simulation(LES) *** LES sub-grid-scale(SGS) model was the basic Smagorinsky eddy viscosity assumption,with a Van-Driest damping function for improved capture of near-wall viscous *** between the two RANS models showed little difference in terms of velocity contours at OGV trailing edge and diffuser *** terms of overall diffuser performance(static pressure recovery and total pressure loss coefficients),the high-Re model was shown to agree well with experimental *** preliminary LES study indicates the highly unsteady character of the OGV wake flow,but requires improved treatment of inlet conditions.

关键词： outlet guide vane(OGV) wakes diffuser flow interaction Reynolds-averaged Navier-Stokes(RANS) modelling large eddy simulation(LES) modelling

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The influence factors of NMR logging porosity in complex fluid reservoir

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Science China Earth Sciences 2008年第S2期51卷 212-217页

作者： DUNN keh jim State key Laboratory of Petroleum Resource and prospecting (at China University of Petroleum)

Porosity is a basic parameter for evaluating reservoir,and NMR logging is an effective method to obtain the porosity. However,we have often found that there exist significant differences between NMR po-rosities and formation core porosities in the complex reservoir. In this paper,we list the factors which affect the NMR porosity response in the complex reservoir,such as longitudinal relaxation time (T1),transverse relaxation time (T2),hydrogen index (HI) and borehole environment. we show how these factors affect the NMR porosity response and suggest methods to correct them. This should improve the accuracy of NMR logging porosity in complex reservoirs for the terrestrial formation.

关键词： NMR logging complex fluid reservoir porosity influencing factors

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A novel application of fluidization-Integrating three processes in reclaiming foundry sand

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Particuology 2010年第6期8卷 595-598页

作者： Derek Geldart jim Lewis Powder Research Ltd Leeds University UK Coastal River Technologies PLLC USA

Immersion of automotive parts in a fluidized bed of foundry sand is used to both strip the castings free from moulding sand and to heat-treat the castings at 500℃. The fluid bed is heated by hot gases from a burner directed first into a serpentine heat exchanger located near one side-wall of the rectangular tank, and then into a distributor consisting of horizontal sparger pipes having maintenance standpipes fixed into their upper surfaces.

关键词： Removal of moulding sand Castings Fluidized beds Heat transfer Foundries

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A review of the geomechanics aspects of a double fatality coal burst at Austar Colliery in NSw,Australia in April 2014

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International Journal of Mining Science and Technology 2017年第1期27卷 3-7页

作者： Hebblewhite Bruce Calvin jim School of Mining Engineering UNSWSydney 2052Australia

A coal burst occurred on 15 April, 2014 at the Austar Coal Mine, located west of Newcastle, NSw,Australia. The burst resulted in fatal injuries to two men working as part of the mining crew at the development face. At the time, a continuous miner was being used to mine a longwall development gate road through heavily structured coal, at a depth of approximately 550 m. A number of pre-cursor bumps had occurred on previous shifts, emanating from the coal ribs of the roadway, in proximity to the coal *** paper reviews the geological, geotechnical and mining conditions and circumstances leading up to the coal burst event; and presents and discusses the available evidence and possible interpretations relating to the geomechanical behaviour mechanisms that may have been critical factors in this incident. The paper also discusses some key technical and operational considerations of ground support systems and mining practices and strategies needed for operating in such conditions in the future.

关键词： Underground coal mining Roadway development Strata controlCoal burst Coal geology Mine safety

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A novel supercapacitor-fuel cell hybrid cell

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Rare Metals 2006年第z1期25卷 12-18页

作者： wANG Y ZHENG jim P Department of Electrical and Computer Engineering Florida A&M University and Florida State University Tallahassee FL 32310 USA Department of Electrical and Computer Engineering Florida A&M University and Florida State University Tallahassee FL 32310 USA

A monolithic hybrid fuel cell (MHFC) with a novel configuration was proposed in an effort to improve the fuel cell performance during instantaneous power changes. A modified direct methanol fuel cell (DMFC) with a layer of hydrous ruthenium dioxide (RuO2·xH2O) sandwiched between the anode catalyst layer and membrane was used to demonstrate the principle of the MHFC. Experimental results indicate that the RuO2·xH2O layer is equivalent to a resistor-capacitor transmission line and functions similar to a capacitor in parallel with the anode electrode. The improvement in dynamic response of the MHFC was experimentally confirmed under step current change and square current pulse operating. The ionic conductivity of the RuO2·xH2O layer was also obtained.

关键词： hybrid devices direct methanol fuel cells hydrous ruthenium dioxide dynamic response

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Stability of active trapdoors in axisymmetry

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Underground Space 2022年第1期7卷 50-57页

作者： Suraparb keawsawasvong jim Shiau Department of Civil Engineering Thammasat School of EngineeringThammasat UniversityPathumthani 12120Thailand School of Civil Engineering and Surveying University of Southern QueenslandQLD 4350Australia

Trapdoor stability has been widely studied by many researchers in the field of tunneling engineering.A general question being fre-quently asked is that why most sinkholes have a near-perfect circular shape on the ground *** could be possibly explained by the current numerical study using finite element limit analysis under axisymmetric condition,where upper and lower bound solutions of active circular trapdoors are *** failure study of sinkholes and the associated failure mechanisms in this paper are for non-homogeneous clay with a linear increase of strength with depth under various cover depth ratios and dimensionless strength gra-dients.A design equation for predicting the stability solutions is also developed based on the novel three dimensional solutions using axisymmetry.

关键词： Numerical analysis Axisymmetry Stability Trapdoor Active failure

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Effects of lemon-tomato juice consumption on crystal formation in the urine of patients with calcium oxalate stones:A randomized crossover clinical trial

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Current Urology 2023年第1期17卷 25-29页

作者： Sathish k.Gopala jim Joe Jithesh Chandran Department of Urology Government Medical College ThiruvananthapuramKerala686008India Department of Biochemistry Government Medical College KottayamKeralaIndia Department of General Surgery Government Medical College KonniKeralaIndia

Background:Dietary supplementation with citrate-containing juices may serve as an effective alternative to potassium citrate therapy for preventing calcium oxalate stone *** study was performed to evaluate whether consumption of lemon-tomato juice can decrease the tendency for stone formation in the urine of calcium oxalate stone *** and methods:The study was conducted as a prospective interventional randomized crossover clinical trial with a repeated-measures ***-two patients with calcium oxalate stones and no metabolic abnormalities in the urine treated with lithotripsy at a tertiary care center from August 2017 to July 2018 were *** a 14-hour overnight fasting,urine samples were collected after the patients consumed either milk only or milk and lemon-tomato *** urine was tested for multiple parameters,including urine pH,specific gravity,calcium-creatinine ratio,and supersaturation with sodium oxalate,followed by optical density measurement via ***:There were no significant differences in the background characteristics between the 2 *** optical density of the urine samples obtained after consumption of milk only was significantly higher than that after consumption of milk and lemon-tomato juice(mean=0.131 for milk only vs.0.053 for milk and lemon-tomato juice,pwas similar between the groups(mean=0.141 for milk only vs.0.076 for milk and lemon-tomato juice,p=0.019).Conclusions:The addition of lemon-tomato juice as a source of citrate in the diet significantly decreases the established risk factors for calcium oxalate stone formation in *** study was prospectively registered at CTRI under number CTRI/2017/04/008312 on April 7,2017.

关键词： Calcium oxalate Dietary supplements Fruit and vegetable juices kidney calculi Urolithiasis

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