A5023827919- Astrophysics and Star Formation Studies
- Stellar, planetary, and galactic studies
- Atmospheric Ozone and Climate
- Bayesian Methods and Mixture Models
- Astronomy and Astrophysical Research
- Statistical Methods and Bayesian Inference
- Statistical Methods in Clinical Trials
- stochastic dynamics and bifurcation
- Molecular Spectroscopy and Structure
- Neural dynamics and brain function
- Insect and Pesticide Research
- Mosquito-borne diseases and control
- Advanced Statistical Methods and Models
- Insect symbiosis and bacterial influences
- Statistical Methods and Inference
- Image and Signal Denoising Methods
- Optimal Experimental Design Methods
- Complex Systems and Time Series Analysis
- Acoustic Wave Phenomena Research
- Probabilistic and Robust Engineering Design
- Chaos control and synchronization
- Hearing Loss and Rehabilitation
- Markov Chains and Monte Carlo Methods
- Sensory Analysis and Statistical Methods
- Algorithms and Data Compression
University of Newcastle Australia
2013-2024
University of Warwick
2002-2022
University of Wollongong
2011
Dynamic Systems (United States)
2008
The University of Western Australia
1998
In this paper we explore the possibility of using a recently discovered form stochastic resonance - termed suprathreshold to improve speech comprehension in patients fitted with cochlear implants. A leaky-integrate-and-fire (LIF) neurone is used model nerve activity when subject electrical stimulation. This model, principle, captures key aspects temporal coding analogue Estimates for information transmitted by population fibres obtained as function internal (neuronal) noise level. We...
Abstract Studying the physical and chemical properties of cold dense molecular clouds is crucial for understanding how stars form. Under typical conditions infrared dark clouds, CO removed from gas phase trapped onto surface dust grains by so-called depletion process. This suggests that CO-depletion factor ( f D ) can be a useful indicator identifying regions (i.e., prestellar cores). We have used 1.3 mm continuum C 18 O (2–1) data observed at resolution ∼5000 au in ALMA Survey 70 μ m Dark...
An innovative strategy to reduce dengue transmission uses the bacterium Wolbachia. We analysed effects of Wolbachia on dynamics in presence two serotypes using a mathematical model, allowing for differences epidemiological characteristics serotypes. found that has greater effect secondary infections than primary across range characteristics. If one serotype is more transmissible other, it will dominate and be less effective at reducing either serotype. Differences antibody-dependent...
Using molecular line data from the Millimetre Astronomy Legacy Team 90 GHz Survey (MALT90), we have searched optically thick \hcop\, for "blue asymmetry" spectroscopic signature of infall motion in a large sample high-mass, dense clumps observed to be at different evolutionary stages star cluster formation according their mid-infrared appearance. To quantify degree asymmetry, measure asymmetry parameter $A = {{I_{blue}-I_{red}}\over{I_{blue}+I_{red}}}$, fraction integrated intensity that...
Abstract We present a study of the chemistry toward 294 dense cores in 12 molecular clumps, using data obtained from ALMA Survey 70 μ m dark High-mass clumps Early Stages. identified 97 protostellar and 197 prestellar core candidates, based on detection outflows transitions high upper-energy levels ( E u / k > 45 K). The rate N 2 D + emission is 38%, which higher than 9% for cores, indicating that does not exclusively trace cores. rates DCO are 35% 49% those , implying appears more...
Abstract Using the upGREAT instrument on board Stratospheric Observatory for Infrared Astronomy, we imaged [C ii ] 157.74 and [O i 63.18 μ m line emission from a bright photodissociation region (PDR) associated with an ionized bubble located in Nessie Nebula, filamentary infrared dark cloud. A comparison Australia Telescope Compact Array data reveals classic structure, uniform progression gas, to photodissociated molecular gas bubble’s interior its exterior. PDR self-absorption features....
We investigate the reconstruction of embedded time-series from chaotic dynamical systems using wavelets. The standard wavelet transforms are not applicable because embedding, and we use a basis pursuit method which on its own does perform very well. When this is combined with continuous optimizer, however, obtain good models. discuss success apply it to some data vibrating string experiment.
ABSTRACT The analysis of partially balanced incomplete block (PBIB) ranked data is discussed. Two examples are given to illustrate two alternative approaches. Analysis PBIB ranking not covered in any the standard sensory evaluation texts and this expository note meant help fill gap. For some sets, calculations for first approach simple enough do by hand. second that we consider assumes computer software general variance available. Such should cope with missing values via a regression method....
We develop a test for equality of variances given two independent random samples observations. The can be expected to perform well when both sample sizes are at least moderate and the asymptotically equivalent maximum likelihood estimators population variances. is motivated by here assessed case populations sampled assumed normal. Popular choices would two-sample if normality Levene’s this assumption dubious. Another competitor Wald difference in give nonparametric analogue call it test. In...
Abstract G23.33-0.30 is a 600 M ⊙ infrared dark molecular filament that exhibits large NH 3 velocity dispersions ( σ ∼ 8 km s −1 ) and bright, narrow (3, 3) line emission. We have probed at the < 0.1 pc scale confirmed emitted by four rare masers, which are excited large-scale shock impacting filament. also displays gradient along its length, discontinuity across width, shock-tracing SiO(5–4) emission extended throughout filament, broad turbulent widths in (1, 1) through (6, 6), CS(5–4),...
How high-mass star clusters form, especially young massive (YMCs: age <100 Myr; mass >104 ), remains an open problem, largely because they are so rare that examples of their cold, dense, molecular progenitors continue to be elusive. The cloud G337.342−0.119, the "Pebble," is a candidate cold progenitor. Although G337.342−0.119 was originally identified as four separate ATLASGAL clumps, similarities in line velocities and widths MALT90 data set demonstrate these clumps fact one single,...
Cochlear implants are used to restore functional hearing people with profound deafness. Success, as measured by speech intelligibility scores, varies greatly amongst patients; a few receive almost no benefit while some able use telephone under favourable listening conditions. Using novel nerve model and the principles of suprathreshold stochastic resonance, we demonstrate that rate information transfer through cochlear implant system can be globally maximized addition noise. If this...
Using the upGREAT instrument on SOFIA, we have imaged [C II] 157.74 and [O I] 63.18 micron line emission from a bright photodissociation region (PDR) associated with an ionized ``bubble'' located in Nessie Nebula, filamentary infrared dark cloud. A comparison ATCA data reveals classic PDR structure, uniform progression gas, to photodissociated molecular gas bubble's interior its exterior. self-absorption features. Toward FIR-bright protostar, both show absorption feature at velocity of $-18$...
Abstract In order to study the structure and temperature distribution within high-mass star-forming clumps, we employed Australia Telescope Compact Array image $\mathrm{NH}_3$ (J,K) = (1,1) through (6,6) (2,1) inversion transitions, $\mathrm{H}_2\mathrm{O}$ $6_{16}$ - $5_{23}$ maser line at 22.23508 GHz, several $\mathrm{CH}_3\mathrm{OH}$ lines hydrogen helium recombination lines. addition, 22- 24-GHz radio continuum emission was also imaged. The probe optical depth gas of compact structures...
In this article we discuss the possible use of a novel form stochastic resonance, termed <i>suprathreshold</i> resonance (SSR), to improve signal encoding/transmission in cochlear implants. A model, based on leaky-integrate-and-fire (LIF) neuron, has been developed from physiological data and model information flow population nerve fibers. It is demonstrated that can, principle, be enhanced by SSR effect. Furthermore, was found enhance transmission for parameters are commonly encountered...