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A bayesian optimisation methodology for the inverse derivation of viscoplasticity model constants in high strain-rate simulations

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defence Technology（防务技术） 2022年第9期18卷 1563-1577页

作者： Shannon Ryan Julian Berk Santu Rana Brodie McDonald Svetha Venkatesh Applied Artificial Intelligence Institute(A^(2)I^(2)) Deakin University75 Pigdons RdWaurn PondsVIC3216Australia defence Science and Technology Group 506 Lorimer StreetFishermans BendVIC3207Australia

We present an inverse methodology for deriving viscoplasticity constitutive model parameters for use in explicit finite element simulations of dynamic processes using functional experiments, i.e., those which provide value beyond that of constitutive model development. The developed methodology utilises Bayesian optimisation to minimise the error between experimental measurements and numerical simulations performed in LS-DYNA. We demonstrate the optimisation methodology using high hardness armour steels across three types of experiments that induce a wide range of loading conditions: ballistic penetration, rod-on-anvil, and near-field blast deformation. By utilising such a broad range of conditions for the optimisation, the resulting constitutive model parameters are generalised, i.e., applicable across the range of loading conditions encompassed the by those experiments(e.g., stress states, plastic strain magnitudes, strain rates, etc.). Model constants identified using this methodology are demonstrated to provide a generalisable model with superior predictive accuracy than those derived from conventional mechanical characterisation experiments or optimised from a single experimental condition.

关键词： Constitutive modelling Finite element Bayesian optimisation Finite element model updating

Liquid metal in prohibiting polysulfides shuttling in metal sulfides anode for sodium-ion batteries

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Journal of Energy Chemistry 2024年第9期96卷 559-567页

作者： Xiaobo Zheng Xinwei Guan Xuan Cheng Xiaoning Li Yang Fu Yitong Li Zhi Zheng Weikong Pang Xun Xu Peng Li Tianyi Ma Institute for Superconducting&Electronic Materials Australian Institute for Innovative MaterialsUniversity of WollongongWollongongNSW 2522Australia School of Science RMIT UniversityMelbourneVIC 3000Australia CSIRO Manufacturing ClaytonVIC 3168Australia

Metal sulfides are a class of promising anode materials for sodium-ion batteries(SIBs)owing to their high theoretical specific ***,the reactant products(polysulfides)could dissolve into electrolyte,shuttle across separator,and react with sodium anode,leading to severe capacity loss and safety ***,for the first time,gallium(Ga)-based liquid metal(LM)alloy is incorporated with MoS_(2)nanosheets to work as an anode in *** electron-rich,ultrahigh electrical conductivity,and self-healing properties of LM endow the heterostructured MoS_(2)-LM with highly improved conductivity and electrode ***,LM is demonstrated to have excellent capability for the adsorption of polysulfides(e.g.,Na_(2)S,Na_(2)S_(6),and S_(8))and subsequent catalytic conversion of Na_(2)***,the MoS_(2)-LM electrode exhibits superior ion diffusion kinetics and long cycling performance in SIBs and even in lithium/potassium-ion battery(LIB/PIB)systems,far better than those electrodes with conventional binders(polyvinylidene difluoride(PVDF)and sodium carboxymethyl cellulose(CMC)).This work provides a unique material design concept based on Ga-based liquid metal alloy for metal sulfide anodes in rechargeable battery systems and beyond.

关键词： GalnSn liquid metal alloy MoS_(2) Polysulfides shuttle effects Catalytic conversion Sodium-ion batteries

Application of geovisual analytics to modelling the movements of ruminants in the rural landscape using satellite tracking data

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International Journal of Digital Earth 2015年第7期8卷 579-593页

作者： K.K.Benke F.Sheth K.Betteridge C.J.Pettit J.-P.Aurambouta department of Environment and Primary Industries–Parkville Centre ParkvilleVICAustralia AgResearch Grasslands Palmerston NorthNew Zealand AURIN Faculty of ArchitectureBuilding and PlanningUniversity of MelbourneParkvilleVICAustralia

Geovisual analytics provides a framework for the development of decision support tools for landscape design,analysis and *** important application is modelling the spatial-temporal movements of ruminants and their grazing behaviour using global positioning system(GPS)collar *** study describes the mapping and analysis of spatial distributions of animal waste products(which correlate with farm nitrogen[N]emissions)and also determination of animal feeding preferences(which correlate with animal welfare and production).Segmentation of local regions of animal N emissions provides support in meeting targets for local and international N leaching and greenhouse gas *** agent-based model was used for prescreening in order to gain insights into the clustering behaviour of sheep during feeding *** spatial analysis demonstrated that livestock excreta are not always randomly located,but concentrated around highly localised animal gathering points,separated by the nature of the *** a separate study,the statistical significance of feeding choices was determined by testing a null hypothesis on animal boundary transitions between adjacent pastures using the binomial *** analysis also included compensation for the precision of the GPS sensor,which produced a fuzzy decision boundary.

关键词： agent-based modelling geovisual analytics nitrogen emissions feeding preferences ruminants satellite tracking

Impact of delay from transperineal biopsy to radical prostatectomy upon objective measures of cancer control

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Asian Journal of Urology 2022年第2期9卷 170-176页

作者： Liang G.Qu Gregory Jack Marlon Perera Melanie Evans Sue Evans Damien Bolton Nathan Papa department of Urology Olivia Newton John Cancer CentreAustin HealthHeidelberg VICAustralia department of Surgery University of MelbourneMelbourne VICAustralia department of Epidemiology and Preventive Medicine Monash UniversityMelbourne VICAustralia

Objective:Treatment delays in prostate cancer have been characterised,although not explicitly in men undergoing transperineal prostate *** aimed to determine if delays to radical prostatectomy correlate with adverse outcomes using a contemporary population-based cohort of men diagnosed by transperineal ***:This study analysed men with prostate cancer of the International Society for Urological Pathology grade group≥2,diagnosed by transperineal prostate biopsies who underwent prostatectomy,using the prospectively data from 1 January 2014 to 30 June 2018 Prostate Cancer Outcomes *** were analysed according to stratified demographic and disease *** intervals from biopsy(28,60,90,120,and 270 days)were compared using odds ratios and regression analyses for proportion of upgrading,early biochemical recurrence,pT3 disease at prostatectomy,and positive surgical ***:In total,2008 men were *** were 306(16.7%)men with upgrading,151(8.4%)with biochemical recurrence,1068(54.1%)with pT3 disease,and 464(23.1%)with positive surgical margins(percentages excluded patients with missing data).All adverse outcomes studied were significantly associated with higher prostate-specific antigen and grade at *** of 120-270 days did not adversely alter the incidence of Gleason upgrading,pT3,or ***(most frequent 60-89 days,28%)were associated with positive surgical margins but not *** modelling demonstrated no increased likelihood of most adverse outcomes for up to 270 ***:Men with prostate cancer of grade group≥2 diagnosed through transperineal biopsy may wait up to 270 days for a prostatectomy without a greater likelihood of upgrading,pT3 disease,positive surgical margins,or biochemical recurrence.

关键词： Biopsy Disease progression Prostate cancer Recurrence Treatment delay

Palladium CO Sensor with Oscillatory Response

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稀有金属材料与工程 2006年第A03期35卷 194-196页

作者： L. Li W. Wlodarski S. Kandasamy D. B. Akolekar Z. G. Zhou School of Electrical ＆ Computer Engineering RMIT University Melbourne VIC 3001 Australia CRC for Microtechnology Hawthorn VIC 3122 Australia School of Applied Sciences RMIT University Melbourne VIC 3001 Australia State Key Lab of New Ceramics and Fine Processing Tsinghua University Beijing 100084 China

Oscillatory changes in resistivity of palladium coil based sensors were studied in the presence of carbon monoxide under constant operating *** in resistance were observed at operating temperature ranging from 100℃to 130℃.Both the period and the amplitude of the waveform increased with increasing CO *** is believed that oscillations occurred between two branches of a Langmuir-Hinshelwood reaction mechanism.

关键词： oscillation palladium carbon monoxide gas sensor

Prostate magnetic resonance imaging and the value of experience:An intrareader variability study

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Asian Journal of Urology 2023年第4期10卷 488-493页

作者： Thomas Whish-Wilson Jo-Lynn Tan William Cross Lih-Ming Wong Tom Sutherland department of Surgery St Vincent's Hospital Melbourne41 Victoria PdeFitzroy VICAustralia department of Surgery The University of MelbourneMelbourne VICAustralia Faculty of Medicine The University of MelbourneMelbourne VICAustralia Medical Imaging department St Vincent's Hospital Melbourne41 Victoria PdeFitzroy VICAustralia

Objective To measure the intraobserver concordance of an experienced genitourinary radiologist reporting of multiparametric magnetic resonance imaging of the prostate(mpMRIp)scans over *** An experienced genitourinary radiologist re-reported his original 100 consecutive mpMRIp scans using Prostate Imaging-Reporting and Data System version 2(PI-RADS v2)after 5 years of further experience comprising>1000 *** agreement was measured using Cohen's ***,specificity,negative predictive value(NPV),positive predictive value(PPV),and accuracy were calculated,and comparison of sensitivity was performed using McNemar's *** Ninety-six mpMRIp scans were included in our final *** the 96 patients,53(55.2%)patients underwent subsequent biopsy(n=43)or prostatectomy(n=15),with 73 lesions *** agreement(Cohen's kappa 0.55)was seen in the number of lesions identified at initial reporting and on re-reading(81 vs.39 total lesions;and 71 vs.37 number of PI-RADS≥3 lesions).For clinically significant prostate cancer,re-reading demonstrated an increase in specificity(from 43%to 89%)and PPV(from 62%to 87%),but a decrease in sensitivity(from 94%to 72%,p=0.01)and NPV(from 89%to 77%).Conclusion The intraobserver agreement for a novice to experienced radiologist reporting mpMRIp using PI-RADS v2 is *** sensitivity is off-set by improved specificity and PPV,which validate mpMRIp as a gold standard for prebiopsy screening.

关键词： Prostate cancer Magneticresonance imaging Prostate Imaging-Reporting and Data System Intrareader Prostate biopsy

Nickel-titanium shape memory alloys made by selective laser melting:a review on process optimisation

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Advances in Manufacturing 2022年第1期10卷 24-58页

作者： Omar Ahmed Mohamed Syed Hasan Masood Wei Xu School of Engineering Deakin UniversityGeelongVIC 3216Australia department of Mechanical Engineering The Higher Institute of Engineering TechnologyBani WaledLibya department of Mechanical and Product design Engineering Swinburne University of TechnologyHawthornVIC 3122Australia

Selective laser melting(SLM)is a mainstream powder-bed fusion additive manufacturing(AM)process that creates a three-dimensional(3D)object using a high power laser to fuse fine particles of various metallic powders such as copper,tool steel,cobalt chrome,titanium,tungsten,aluminium and stainless *** the past decade,SLM has received significant attention due to its capability in producing dense parts with superior mechanical *** a premier shape memory alloy,the nickel-titanium(NiTi)shape memory alloy is attractive for a variety of biomedical applications due to its superior mechanical properties,superelasticity,corrosion resistance and *** paper presents a comprehensive review of the recent progress in NiTi alloys produced by the SLM process,with a particular focus on the relationship between processing parameters,resultant microstructures and *** research gaps,challenges and suggestions for future research are also addressed.

关键词： Additive manufacturing(AM) Selective laser melting(SLM) Microstructure NiTi alloy Mechanical properties

Flexible synthesis of high-purity plasmonic assemblies

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Nano Research 2021年第3期14卷 635-645页

作者： Laurent Lermusiaux Anum Nisar Alison M.Funston ARC Centre of Excellence in Exciton Science and School of Chemistry Monash UniversityClaytonVIC3800Australia

The self-assembly of nanoparticles has attracted a vast amount of attention due to the ability of the nanostructure to control light at the sub-wavelength scale,along with consequent strong electromagnetic field ***,most approaches developed for the formation of discrete assemblies are limited to a single and homogeneous system,and incorporation of larger or asymmetrical nanoparticles into assemblies with high purity remains a key ***,a simple and versatile approach to assemble nanoparticles of different sizes,shapes,and materials into various discrete homo-or hetero-structures using only two complementary deoxyribonucleic acid(DNA)strands is ***,surface functionalisation using DNA and alkyl-polyethylene glycol(PEG)enables transformation of as-synthesised nanoparticles into readily usable plasmonic building blocks for *** of the DNA coverage enables the production of different assembly types,such as homo-and hetero-dimers,trimers and tetramers and core-satellite structures,which are produced in high purity using electrophoresis *** approach is extended from purely plasmonic structures to incorporate(luminescent)semiconductor nanoparticles for formation of hybrid *** deposited assemblies form a high yield of specific geometrical arrangements,attributed to the van der Waals attraction between *** method will enable the development of new complex colloidal nanoassemblies for biological and optical applications.

关键词： deoxyribonucleic acid(DNA)self-assembly electrophoretic purification nanoparticle assemblies colloidal stability

Intraocular lens exchange-removing the optic intact

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International Journal of Ophthalmology(English edition) 2016年第6期9卷 925-928页

作者： Matthew Hao Lee Diane Lesley Webster department of Ophthalmology Alfred HospitalMelbourneVIC 3004Australia Royal victorian Eye and Ear Hospital East MelbourneVIC3002Australia

Current practice for intraocular lens （IOL） exchange is to cut the optic of the posterior chamber intraocular lens （PCIOL） prior to removing it. Great care must be taken during this maneuver to avoid a posterior capsular tear. Removing the haptics from the fibrosed capsule can also be hazardous, as it may result in zonular stress and dehiscence. A technique is described for performing foldable （one-piece acrylic） IOL removal without cutting the optic. Careful visco-dissection of the haptics with a low viscosity ophthalmic viscosurgical device （OVD） in the fibrosed peripheral capsular tunnel avoids zonular or capsular stress. Internal wound enlargement permits foldable IOL removal in one piece, whilst preserving a self-sealing sutureless corneal wound. This technique may enhance the safety and efficacy of foldable IOL exchange.

关键词： intraocular lens exchange viscodissection posterior capsular tear