UNSW@ADFA Mathematics & Physics Seminars 2008

Everyone welcome !

Seminars are usually over 40 minutes plus questions, on Friday mornings, 10:10 - 11:00 in Room P25 on the ground floor of PEMS South (Building 26 on the campus map) unless otherwise stated. Light refreshments (coffee and biscuits) served from 10am.

A link to the 2007 program of Maths and Physics Seminars and the 2006 program of Physics Seminars is placed here for those interested in looking at the last two years' activities.

A link to the 2006 program of Mathematics Seminars is placed here for those interested.

Next Seminar:

Friday 14 November 10.10am, P25

Presented by: Dan Carmody, Defence Imagery and Geospatial Organisation (DIGO)

Abstract – Bathymetry, big bangs and remote controlled planes.

Dan Carmody completed his Master of Science degree at ADFA researching bathymetry from remote sensing with multispectral and hyperspectral imagery in 2007.  He is also a member of the Defence Imagery and Geospatial Organisation (DIGO), Australia 's largest spatial science organisation.  Dan has worked in a number of different areas of DIGO including the Imagery Operations area, the Advanced Geospatial Operations area and is now leading a team in DIGO's capability development area. At this seminar, Dan will speak on his Master's work and of some of his work at DIGO.

Two methods for deriving bathymetry were trialled.  One uses a ratio of subsurface irradiance reflectance at two wavelengths and then tunes the result with known water depths.  The other inverts the radiative transfer equation utilising the optical properties of the water to derive water depth. Both techniques derived water depth down to approximately six to seven metres.  At that point the waters became optically deep.  This research demonstrated that water depth can be accurately mapped with optical techniques in less than ideal optical conditions.  Sensitivity analysis of the inversion method found that it was most sensitive to errors in vertical attenuation K_dand to errors in transforming the imagery into subsurface irradiance reflectance, R_(0-) units.  Both techniques require a priori knowledge to derive depth and a more sophisticated approach would be required to determine water depth without prior knowledge of the area of interest.

Two very different activities with nothing to do with bathymetry include blowing things up at Woomera and my involvement in unoccupied aerial systems (UAS) also known as unmanned air vehicles (UAV).  A rather earth shattering experience was my involvement in an explosives storage safety assessment in Woomera.  At this event four very large detonations occurred and the effects were documented to assess whether the current safety arrangements for storage were adequate.  My current activity is integrating full motion video (FMV) from UAS into DIGO's exploitation processes.  There are many significant issues with the exploitation, storage and retrieval of FMV and these will be discussed.

 

Friday 7 November, 10.10am, P25

Presented by: Jamie Moogan, 2008 Honours student

An Investigation into Fog Clearance Forecast Modelling

This presentation is the second and final seminar for the honours project. The project has focused on the use of previously existing clearance model for fog clearance, which utilises satellite data acquisition, and adapted it for the use with ground-based observations.

Atmospheric data was obtained by the use of many remote sensing instruments at the PEMS@ADFA field site at Addison Oval.  These include; the optical system, SODAR, radio acoustic sounding system, automatic weather station and the sonic anemometer.  I will present their processes and application to the model and the results which were obtained.

I will finally discuss the model employed and the conclusions which can be drawn from the introduction of the data from the remote sensing instruments.

 

Friday 24 October, 10.10am, P25

Presented by: Wolf-Dietrich Zeitz, PEMS Visitor

Electronic configuration of Atoms on Metal Surfaces

By elaborate preparation techniques single guest atoms could be positioned at different sites on metal surfaces.

The magnetic hyperfine fields and the electric field gradients at the nuclear sites of these atoms were measured with perturbed angular correlation spectroscopy.  The magnetic hyperfine fields correlate with the number of neighbouring atoms of the substrate.  The electric field gradients depend on the arrangement of atoms around the guest atom.

These findings are interpreted on the basis of recent band structure calculations which take the wave character of the electrons into account.  Similar considerations have been done for other small atomic configurations such as break junctions or nano-scaled wires.

Friday 17 October, 10.10am, P25

Presented by: Natasa Bulatovic, PhD Student, PEMS

Continuous Wave Electron Spin Resonance in Silicon: Phosphorus Nanostructures

Phosphorus doped silicon (Si:P) was proposed as a potential basis for a quantum computer due to its long spin coherence times and compatibility with existing technology.  Electron spin resonance (ESR) is a microwave spectroscopy in which there is a resonant absorption of radiation by electrons of a paramagnet when placed in a magnetic field.  This spectroscopy can be used to estimate the (active doping) concentration, to identify dopants and electron trap states (e.g. Pb) and is sensitive to the exchange coupling of donor pairs.

Presented by: Anwaar Malik, PhD Student, Pems

Ion beam assisted formation of magnetic nano-crystals

Nano sized magnetic materials have opened new applications such as magnetic media for high density recording, contrast enhancement in magnetic resonance imaging, and magnetically guided drug delivery in biomedicines.  These magnetic nano-particles can be produced by ion implantation.  A brief over view of their applications and the procedure of their production will be presented.

 

Friday 10 October, 10.10am, P25

Presented by: Dr David Low, PEMS

Reporting  from Uniserve

The UniServe Science Conference is an annual gathering of Australian tertiary science educators: mostly Physics, Chemistry and Biology, but the odd Mathematician sometimes manages to dodge security and get a slot.  In the interests of keeping the local community informed of what the wider community is thinking about, I'll give a summary of the three topics I attended: the Physics Discipline Day, the First Year Experience forum, and the symposium on Visualisation.

Friday 19 September, 10.10am, P25

Presented by: Dr Ying Chen, Senior Fellow, Department of Electronic Materials Engineering, RSPhysSE, ANU

Nanotubes and nanowires for health care and new energy applications

The fundamental scientific basis of Nanotechnology derives from the change in materials properties at the 1-100 nm scale.  One-dimensional (1D) nanomaterials including tubes, wires, rods, belts and fibers with a diameter less than 100 nm form a new class of materials.  These 1D nanomaterials exhibit special physicochemical and optoelectronic properties, due to electron conf inement and high-surface-area effects. Quantum-confined 1D nanostructures have been used in photovoltaic devices.  The almost defect-free, monocrystalline structure and high surface-to-volume ratios of 1D nanomaterials endow them with high stiffness and strength, leading to applications in reinforced composites, nanosized actuators, force sensors and calorimeters.  The new chemical, electronic and magnetic properties of nanowires and nanorods have enormous potential in electronic, sensing and catalytic applications.  The synthesis, structure characterization, proper ty and applications of 1D nanomaterials are the forefront research in nanomaterials and nanotechnology.  We have developed a high-energy ball milling and annealing process that produces larger quantities of nanotubes and nanowires than other production methods.  In our method, the starting materials powders are transformed into nanotubes and nanowires during controlled ball milling and thermal annealing processes.  I will give brief review on the production method, nanoscale structures, key properties and applications in health care and new energy areas.

Friday 5 September, 10.10am, P25

Speaker: Ms Sevilay Esat, Science and Engineering Librarian at UNSW@ADFA

Sevilay will bring you up to date with library services and resources.
The topics include:

CSA Illustrata: Technology offers deep indexing for tables, figures, graphs, charts and other illustrations from the scholarly research and technical literature.  "Deep indexing" categorizes data, variables and other content  represented in tables, maps, photographs and other figures.
Content: Physics, Mathematics
Coverage: 2003 - present

Ei Engineering Village : Compendex, Inspec, Geobase

Scitopia.org http://www.scitopia.org/ a free federated search portal to the digital libraries of leading science and technology societies

Scopus includes references of an article in the export to EndNote

Web of Science: Citation Map

TVNews

EndNote X2 now available

The Hub: a flexible learning space

New inter-library loan service: Ask4it

The presentation will be an overview of the system, reasons for the decision to change and an introduction to the user interface.

 

Friday 29 August, 10.10am, P25

Speaker: Kenn Batt, Officer in Charge of the Canberra Office of the Bureau of Meteorology and part time PhD student, PEMS

Some Observations and Modelling of Winds over SE Australia

Since the 1970s Numerical Weather Prediction (NWP) has progressed in quantum leaps with very high resolution prediction models running routinely at horizontal resolutions in the range 500m to 5000m and with vertical resolutions anywhere between 20 and 60 levels. Some of these models are able to run on laptop computers as well as desktop PCs.

Huge improvements in data assimilation techniques and computing technology over time, coupled with a greater understanding of the more complex physical processes of the atmosphere (and oceans), has allowed NWP models to run at much faster speeds and at much higher resolutions than, say, 10 to 15 years ago .

Up until about the mid-90s, high to very high resolution NWP models were mostly used to study local meteorological phenomena such as the sea breeze circulation (McPherson, 1970, Pielke, 1974, Physick, 1976 and 1980, Abbs, 1986 and Abbs and Physick, 1992) and other mesoscale phenomena as outlined in Noye (1987).  From an ocean yacht racing perspective, the interpretation of global and regional NWP model output was primarily used to aid in the construction of yacht race forecasts, such as the Sydney to Hobart and others around the globe.  This essentially was the case until the HIRES NWP model was developed and became an operational model.

A number of Sydney to Hobart Yacht races and other races along the New South Wales coast increased my desire to better understand a number of complex interactions, including, the coastline on wind velocity, southerly changes during the warmer months along the southern NSW coast and the effect of the Tasmanian Highlands on the wind flow along the east coast of Tasmania.  These studies led to an MSc being granted in 2005.

Since being stationed in Canberra , the summer-time easterly has become my subject of interest.  It poses a big forecasting challenge and can impact in a big way on aircraft movements at Canberra Airport, fire fighting and recreational activities on the Canberra Lakes amongst others.  This study involving the observation and modelling of this easterly forms the basis of my PhD.

This talk will outline my earlier and current work in mesoscale meteorology.

 

Friday 22 August, 10.10am, P25

Speaker: Banchachit Saensunon, PhD student with Glen Stewart

The crystal field interaction at the rare earth site in ErNiAl₄

Banchachit's PhD project is directed at the influence of the crystal field in rare earth intermetallics, in particular the RT₂Si₂(R = rare earth, T = 3d metal) and RNiAl₄ intermetallic series.   In this talk he will describe the process that has led to preliminary characterisation of the crystal field at the rare earth site in ErNiAl₄.   The characterisation is based on inelastic neutron scattering data recorded at the Berlin Neutron Scattering Centre in combination with theoretical point charge model calculations for ErNiAl₄ and the results of an earlier ¹⁵⁵Gd-Mössbauer spectroscopy investigation for isostructural GdNiAl₄.   It is anticipated that the derived crystal field parameters will provide an explanation for the intriguing magnetic behaviour that has been observed right across the RNiAl₄ intermetallic series.

 

Friday 15 August, 10.10am, P25

Speaker: Chris Wright, ARC Research Fellow, PEMS

Before Planets: The Mineralogy and Chemistry of Pre-Planetary Disks

Planets form within the circumstellar disks around young stars.  Samples of the solid material – or dust in astronomical parlance – comprising our own primitive disk are found in meteorites and interplanetary dust particles.  Using the powerful technique of astronomical mid-infrared spectroscopy, including polarimetry, we will ascertain the composition of the dust existing within the disks around young stars.  By studying a range of disk ages we will determine how the composition evolves with time, and what physical processes affect it, in order to better understand how our own solar system formed.  Further, we will image these disks in mm-wave continuum and molecular emission, in so doing constraining the characteristic dust size, as well as the disk's gaseous chemistry and rotational properties.

 

Friday 8 August, 10.10am, P25

Speaker: Dr Martin Wille, Earth Environment Group, Research School of Earth Sciences, ANU

From the rise of oxygen to recent climate change: What isotopic signals in sediments can tell us!

Martin will discuss how elemental abundances and isotopic signatures can provide information about the paleoenvironment.
Abstract: Rocks and, in particular sediments, are often the only archive for paleoenvironmental reconstruction.  The abundance and isotopic signature of different elements within these sediments can be correlated to various environmental condition such as redox state or nutrient supply, and hence can be used to study environmental changes over time.
In this talk I will present different isotopic systems with a focus on molybdenum (Mo) and silicon.  Due to its redox dependent solubility and its conservative behavior in the ocean environment, the Mo signature of marine sediments is known to be a good proxy for paleoredox reconstructions.  I will present Mo signatures from around the two major global oxidation events at 2500 and 550 Ma which indicate changing redox conditions at these periods.

In the second half on my talk I will present new silicon and boron isotopic data in recent sponges and diatoms.  The silicon signal in siliceous biogenic sediments (opal) can be used as a paleoproductivity and nutrient tracer while the boron signal can monitor the paeo-pH of the ocean.  The combination of both these isotope systems will provide a new insight into the changing carbon cycle and its climatic impacts.

Friday 1 August, 10.10am, P25

Speaker: Dr Zbigniew Stachurski from the Department of Engineering at ANU

Geometric Patterns and Structure of Solids  (Abstract attached)

 

Friday 25 July, 10am, P25

Speaker: Emeritus Prof. Colin Pask

Remembering Rowland Sammut and some early work in Fibre Optics

The sad passing of Rowland Sammut has made me think about some of the early work that was done in the pioneering days at ANU.   Rowland was one of the PhD students there and he wrote a brilliant thesis on an extremely difficult topic.   (Peter Mc was also at ANU.)

I thought I would give a very informal talk about fibre optics, some of the interesting theoretical problems we tackled and some of the applications.   This talk is a spur-of-the-moment decision so there will be no smooth slide display or powerpoints.

Friday 13 June, 1540h, P25

1540h (20 minutes talk, plus 5 minutes questions)
Speaker: Nathan Schubert, CDF student

Total Knee Replacements

ABSTRACT: Current techniques used for studying particle debris from actuation between the femoral metal knee component and the polymer acetabular cup within Total Knee Replacements (TKRs) are limited to the manual identification of particles with limited correctional methods. The first phase of this project sought to deconstruct current computational methods of image analysis within MATLAB in order to improve upon their accuracy and efficiency, whilst still allowing user input into the final results. The second phase of this project has been to prepare particle debris samples and implement the improved analysis software to provide quantitative measurements of the size and frequency of particle debris related to wear in new TKRs. Finally, independent calibration tests were performed on the sample preparation and computational analysis techniques to qualify the legitimacy of results.

1605h (20 minutes talk, plus 5 minutes questions)
Speaker: Danica Ellicott, CDF Student

Antarctic Bathymetry

ABSTRACT: The Southern Ocean and in particular, the Antarctic region below 60° South, is the least surveyed and explored ocean in the world; it is sparse with ship soundings due to its sheer size and fierce nature. Knowing its bathymetry is essential for many reasons, two being safe ocean navigation, and as an accurate base input for models to understand and predict tides, currents, internal waves, and tsunamis. Three different satellite and hybrid-satellite bathymetric datasets have been investigated and compared to ship soundings as well as each other in order to determine their accuracy, accomplished by calculating the RMS difference and correlation. The goal of this study was to identify the most accurate dataset, which my research has found, differs for various latitudes. The results will aid the wider scientific community to design accurate field equipment and to improve ocean simulations by providing information on the most accurate bathymetry for their Antarctic region.

 

Friday 13 June, 10am, P25

Speaker: Jamie Moogan, Physics Honours Student

An Investigation of Fog Clearance Time

Fog poses a significant problem for air and ground transport industry. Fog is produced when the atmospheric temperature approaches the dew point, which causes water vapour to condense and reduce visibility to less than 1000 metres. Since it is difficult to forecast the formation and characteristics of a fog episode, determination of fog clearance times can only be predicted using data obtained during a specific event. By making observations during a fog episode, it is possible to determine the heat flux, liquid water content and fog layer depth. These are fundamental variables which are required for clearance predictions and are obtainable using existing UNSW@ADFA assets. In this talk, I will discuss models for the prediction of clearance times for a fog episode and a detailed explanation of the determination of fundamental variables.

Thursday 24 April, 11am, P25

Speaker: Chris Bose, Department of Mathematics and Statistics, University of Victoria, Canada (on sabbatical leave to UNSW, Jan-July 2008)

Computing and approximating invariant measures in ergodic theory

Abstract:  Ergodic theory is the study of measurable dynamical systems. In this category, the state space is a measure space X=(X, B, m) and the dynamics are provided by iteration of a measurable mapping T:X -> X preserving the measure m (or in continuous time, a measure-preserving flow). In the first half of the talk I will present a few concrete examples and interpret the results of ergodic theory as it relates to asymptotic behavior of the system (X,T). Typical of such results are recurrence, Birkhoff's Theorem, decay of correlations and versions of the Central Limit Theorem.

In many cases, a measurable pair (X,T) come equipped with a natural invariant measure m on X. However, for other interesting examples, m is not known.

In the second half of the talk we will discuss how one might infer the existence of an invariant measure m and, of more practical interest, how to compute approximations to it.

This talk should be accessible to a general audience of mathematicians, physicists and engineers.

 

Friday 18 April, 10:10am, P25

Speaker: Frank Klose, Bragg Institute, Australian Nuclear Science and Technology Organisation (ANSTO)

Nanomagnetism, Spintronics and Polarized Neutrons

Spintronics (or spin electronics) is a very promising approach for achieving further miniaturization, higher speed and lower power consumption of consumer electronic devices like laptop computers and MP3 players. Spintronic devices specifically exploit the spin properties of the electrons (i.e. its magnetism) instead of, or in addition to, the charge degrees of freedom. [1,2]. The prototype device that is already in use in industry as a read head in hard disk drives and as a memory-storage cell, is the giant-magnetoresistive (GMR) sandwich structure (the 2007 Nobel price was awarded to Peter Gruenberg and Albert Fert for this discovery).

Polarized neutron reflectometry (PNR) is an ideal tool for investigating vector magnetization profiles in thin film systems for future spintronic applications. The method has been used successfully for many years, for example, to demonstrate oscillatory exchange coupling in magnetic multilayers which was essential for the understanding of the GMR effect. Similarly essential for the functioning of the GMR sensor is the exchange bias effect. In my lecture I will present recent PNR results on chemical order-induced exchange bias in FePt₃ epitaxial thin films, a material which has the remarkable property that, depending on the degree of chemical order, a ferromagnetic (FM) and an antiferromagnetic (AFM) magnetic state can coexist at the same temperature [3].

[1]     S. Parkin, X. Jiang, C. Kaiser, A. Panchula, K. Roche, M. Samant, Proceedings of the IEEE 91 (5), 661 (2003).
[2]     C. Chappert, A. Fert, F.N. Van Dau, Nature Materials 6 , 813 (2007).
[3]     D. Lott, F. Klose, H. Ambaye, G.J. Mankey, P. Mani, M. Wolff , A. Schreyer, H. M. Christen, and B.C. Sales (submitted to Phys. Rev. Lett., Dec. 2007)

 

Friday 28 March, 15:40, P25

Coffee and biscuits from 15:30

Speaker: Dr John Stride, Bragg Lecturer in the School of Chemistry, UNSW (Kensington), visiting Professor Stewart Campbell and the Advanced Materials group

Chemistry on the nanoscale: from magnetism to novel structures

The study of molecular and molecule-based systems is central to much of what is increasingly being considered as nanotechnology .  My research has focused largely upon the fundamental interactions in magnetic materials and lattice dynamics, and being a chemist, this has been squarely along the lines of molecule-based systems.  Much of this work has incorporated neutron scattering techniques and I believe that the arrival of the OPAL reactor at ANSTO brings many new opportunities to the greater Australian research community.  I will provide an example of some ongoing research into molecule-based magnets, specifically concentrating on the neutron scattering measurements, in an effort to demonstrate some of the new developments at OPAL with which I am involved. In addition, I will present some very recent work on carbon nanostructures including graphene and multi-walled nanotubes, that we have initiated at UNSW and which shows great potential in the bulk synthesis of these materials and even environmental remediation.

Friday 14 March 10:10, P25

Speaker: Lulu QIAO, Ocean University of China

Numerical Study of Generation of the Tidal Shear Front off the Yellow River Mouth, China

Abstract: The tidal shear front off the mouth of the Yellow River (the second largest river in China) is an interface between two water bodies with opposing flow directions and significant different velocities. Despite numerous studies conducted on it, a detailed investigation of the front generation has not been carried out. The aim of our work is to use a 3-dimensional tidal model coupled to a sediment transport module to examine the front formation.

One benchmark and five sensitive experiments were conducted with different effects of topography, bottom friction, river run-off, coastline variation and model resolution, respectively. Our conclusion is that topography off the Yellow River mouth is a determining factor for the front generation, which is responsible for both maximum phase gradient and sediment concentration variability across the tidal shear front.

With the extending Yellow River delta, the tidal shear front under the bathymetry of year 2003 has also been predicted.

 

Friday 7 March, 15:40, P25

Speaker: Professor Michael Loewenhaupt
Institut für Festkörperphysik (Institute for Solid State Physics)
Technische Universität Dresden (TU Dresden), Germany

Magnetic properties of R₂PdSi₃ compounds studied by laboratory methods and neutron scattering

Abstract: The intermetallic compounds R₂PdSi₃ (R = rare earth) crystallize in an AlB₂ derived hexagonal structure. "Unusual" magnetic behavior such as spin-glass like phase transitions or quasi-one dimensional magnetism has been reported.

The magnetic properties of single crystalline samples with R = Gd, Tb, Dy, Ho, Er and Tm were determined by temperature and field dependent ac-susceptibility, magnetization, neutron diffraction and inelastic neutron scattering experiments. The investigated R₂PdSi₃ compounds order antiferromagnetically at Néel temperatures between 1.8 K (Tm) and 24 K (Tb). The magnetic phase diagrams exhibit a rich variety. The magnetic structures vary widely - from long-range antiferromagnetic order (LRO) with different propagation vectors  to short-range magnetic correlations (SRC), partly coexisting or competing with each other.

This complex magnetic behavior results from the interplay of RKKY-interaction, magneto-crystalline anisotropy based on crystal-electric field effects and geometric frustration. The study of different R³⁺ ions allows the separation of the different influences on the magnetic behavior. For instance the compounds with small or negligible crystal electric field (Gd, Ho) order with a propagation vector of (1/7 0 0) determined by the interplay of RKKY-interaction and geometric frustration. The application of magnetic fields counteracts the effects of frustration e. g. transforming SRC into LRO as observed in Tb₂PdSi₃.

We will show that the "unusual" magnetic behavior can be understood through the interplay of the aforementioned competing interactions.

Friday 29 February, 11.00am, P25

Speaker: Prof Ravi K Manchanda, Tata Institute of Fundamental Research, Colaba, Mumbai and TIFR@Hyderabad, ECIL X-roads, Hyderabad

Wonderful world of dead stars

It is believed that in the cosmic time-line, the galaxies and the stars appeared between 2-10 billion years after the Big Bang, which created the visible universe. Our Sun and its planetary system was formed almost 5 billion years ago.

Star formation is a slow process extended over 100,000 years, during which it condenses from a gas cloud and starts burning its nuclear fuel to shine away its energy. A sun like star has a life of 10 billion years. Most of the stars evolve without any significant event in their life. At the end of their nuclear life cycle, each star has its designated stellar death. While Sun like stars become white dwarfs, heavy stars take the most exotic form like the Neutron stars, the Black holes, the Magenetars (stars with very high magnetic fields) or the Gamma ray flashers.

In this talk I will describe the observational features and physical properties of such Exotic corpses in the universe. (I shall keep the subject treatment at an elementary level and no previous knowledge of the astronomy is requisite).

 

Wednesday 20 February, 11am, G23 - Bldg 26

Speaker: Professor Jorge Niello from Comision Nacional de Energia Atomica, Universidad Nacional de San Martin, Buenos Aires, Argentina

Environmental applications of nuclear techniques

In the last years, natural and anthropogenic radioisotopes have found numerous applications in environmental studies as well as transport processes in atmospheric and aquatic systems. Consequently the data-base of radionuclides' atmospheric deposition is growing, mainly due to routine monitoring programs of radioactive fallout.

In order to contribute to this data-base and also to address some of the problems associated with contaminated aquifers in Argentina, we recently started a research program on environmental applications of radioisotopes in Buenos Aires. In this talk I will briefly report on some of the projects that we are currently doing in this field, e.g. 210Pb sediment dating of a contaminated drain channel and the use of 7Be as soil tracer.

Monday 11 February, 11.00am, SL1 - Bldg 21

Speaker: Dr Winston Sweatman, Institute of Information and Mathematical Sciences Massey University at Albany Auckland, New Zealand

Encounters of binary stars that lead to mutual destruction
Binary stars can be destroyed through interaction with other binary or single stars. By destruction we mean separation into the component stars. Through analogy with atomic physics this process is called ionisation. It is important to understand this process as the dynamics of much larger stellar systems can be driven by few-body interactions involving binaries. In the simplest model, stars are approximated by point masses. In the case of binary-single star encounters, there exist theoretical approaches to asymptotically approximate the ionisation cross-section for extremes of high and low energy. Recently, these have been extended to the four-body case of binary-binary encounters leading to a disruption of the binaries into single stars.

Friday 25 January, 11.10am

Speaker: Dr Roy Hughes, Littoral Warfare Branch, Maritime Operations Division, Defence Science and Technology Organisation

Advanced REA Sensor Systems and Concepts
This presentation will provide an overview of the advanced sensors and concepts being developed and considered  for future use in acquiring bathymetry as part of Rapid Environmental Assessment (REA).

A snapshot of passive and active bathymetry systems and techniques under development and evaluation will be presented, with a focus on the potential for multi role capability, and provision of just-in-time data. 

Also included will be current and impending research into hyperspectral and multispectral bathymetric imaging, determination of water column properties, in addition to a concept for a UAV-borne hyperspectral system.