Wednesday 3rd of April 2019 at 8pm
Kerr Grant Lecture Theatre
2nd Floor, Physics Building
The University of Adelaide
North Terrace, Adelaide

The Evolutionary Map of the Universe

Professor Ray Norris
CSIRO Astronomy & Space Science &
Western Sydney University

Abstract: The m Australian Square Kilometre Array Pathfinder (ASKAP) telescope is nearing completion in Western Australia. One of the key projects driving it is EMU – the Evolutionary Map of the Universe – which has an ambitious goal of studying the sky at radio wavelengths in unprecedented detail, boldly going where no telescope has gone before. Our scientific goal is to figure out how galaxies evolved in the early days of the Universe and how they evolve to the Universe we see today, with stars, planets, rocks, trees, and astronomers. What will we find? How will it change our view of how we got to be here? What is the role of black holes in regulating the growth of galaxies? And given that the most spectacular discoveries in astronomy are unexpected, we will be watching especially carefully for serendipitous discoveries that pop up in the data.

Bio: Professor Ray Norris is a British/Australian astronomer with CSIRO Astronomy & Space Science and Western Sydney University, who researches how galaxies formed and evolved after the Big Bang, and also researches the astronomy of  Aboriginal Australians. He frequently appears on radio and TV, featured in the stage show “The First Astronomers” with Wardaman elder Bill Yidumduma Harney, and has written the novel “Graven Images”.  He was educated at Cambridge University, and University of Manchester, UK, and moved to Australia to join CSIRO, where he became Head of Astrophysics in 1994, and then Deputy Director of the Australia Telescope, and Director of the Australian Astronomy Major National Research Facility, before returning in 2005 to active research. He currently leads an international project (EMU, or Evolutionary Map of the Universe) to understand the origin and evolution of galaxies, using the new Australian SKA Pathfinder radio-telescope nearing completion in Western Australia, and is also pioneering the WTF project to discover the unexpected in astronomical data.

Free – visitors welcome –  booking not required (*Please note – university security locks entrance doors at 8pm sharp*)

Thursday 28^th of February 2019 at 6.30 to 7.45 pm
Napier 102 lecture theatre, 1^st floor, Napier Building
University of Adelaide

Optical Tweezers ‘Demystified’

Assoc. Professor Bruce Wedding

University of South Australia

Since their invention 32 years ago, optical tweezers have become a powerful tool utilised in a wide variety of experiments in biology and physics. Optical tweezers use light to trap microscopic objects as small as 10 nm using radiation pressure from a focused laser beam. These trapped particles can then be manipulated and forces on the particles in the trap can be measured. The first designs of optical tweezers used high power lasers and expensive optical hardware. Recently however, simple and inexpensive apparatus for undergraduate laboratories can produce a single beam optical tweezer to trap micron-sized particles. Such a system in undergraduate laboratories and the resulting student engagement will be presented.

Interest in microfluidics is also a rapidly expanding area of research and the use of microchips as miniature chemical reactors, so called ‘Labs-on-a-Chip’ is increasingly common. Microfluidic channels are now complex and combine several functions on a single chip. Fluid flow details are important but relatively few experimental methods are available to probe the flow in a confined geometry. We can use optical trapping of a small dielectric particle to probe the fluid flow in microfluidic channels.

Rather than using the optical trap to position and release a particle for independent velocimetry measurement, we map the fluid flow by measuring the hydrodynamic force acting on a trapped particle. The flow rate of a dilute aqueous electrolyte flowing through a microchannel has been mapped using a small (1 µm diameter) silica particle. Such flow mapping is time efficient, reliable, and can be used in low-opacity suspensions flowing in microchannels of various geometries.

The Bronze Bragg medals and certificates will be presented at the lecture. The medal is awarded for highest achievement in Physics in 2018 in the SACE Stage 2 assessments, with certificates being for students who achieved a merit.

 The presentation and lecture will be held in the Napier 102 Lecture Theatre, Napier Building, 1^st floor, University of Adelaide, North Terrace, north from Pulteney St., at 6.30pm. Members of the public are warmly invited to attend. We are obliged for security reasons to keep the front door of the building attended, so please arrive before 6.30pm. Bookings are not available. The doors must be closed if all seats are taken.

Enquires: Email via aip_branchsecretary_sa@aip.org.au  mob: 0427 711 815.