The energy of ultra-high energy (UHE) cosmic rays that strike the Earth’s atmosphere make the energy produced from particle collisions by the Large Hadron Collider look puny. A team based in South Australia is now developing the techniques and technology to find out where such energetic particles could possibly originate. They ultimately hope to use the proposed SKA telescope to conduct their search.
“We think some cosmic rays are produced in the remnants of supernovae—exploding stars—but where the most energetic ones come from, that’s a mystery,” says Justin Bray, a PhD student hunting for their source as part of the LUNASKA (Lunar Ultra-high-energy Neutrino Astrophysics using SKA) project led by Ray Protheroe at the University of Adelaide and Ron Ekers at CSIRO. Continue reading Tracing cosmic rays from radio pulses→
Einstein’s general theory of relativity predicts them, and they could be scattered throughout the Universe. But so far, gravitational waves— ‘ripples’ in the fabric of space and time—have never been detected. Several Australian teams of astronomers are trying to catch the first signs of one.
On 13 June 2010, a Japanese spacecraft bearing pieces of another world parachuted down to Australian soil after a seven-year-long journey through deep space.
During its journey, the spacecraft, called Hayabusa, encountered the 530-metre-long asteroid called Itokawa in November 2005, and briefly landed on it. The Japanese Aerospace Exploration Agency (JAXA) designed Hayabusa to collect samples of the asteroid’s surface. Hayabusa then landed at the Department of Defence’s remote Woomera Prohibited Area in the South Australian desert. Fifty years ago, Woomera was one of the most active rocket launch sites in the world. It is still the largest land-based test range on the planet. Continue reading Japanese spacecraft calls Australia home→
South Australian researchers are using the Australian Synchrotron in their work on how to increase levels of iron and other micronutrients in staple grains such as rice and barley. The intense X-rays of the synchrotron can pinpoint where in the grain those micronutrients are found.
One third of the world’s population suffers from iron deficiency. One of the reasons for this is that more than three-quarters of the iron in rice is lost when the outer layers of the grain are removed during milling.
Enzo Lombi and Erica Donner from the Centre for Environmental Risk Assessment and Remediation at the University of South Australia are using the x-ray fluorescence microscopy (XFM) beam to probe grains of rice, barley and other staple grains that have been designed to boost levels of key micronutrients like iron.
The researchers use the intense synchrotron light to produce images showing concentrations of elements, like iron, copper, zinc and selenium.
One of the new plants they are studying is a strain of rice that has multiple copies of the gene for nicotianamine, which is involved in the long-distance transport of iron. The idea is that more iron will be moved into the inner layers of the rice grain.
The technique used by Enzo and Erica is the only one sensitive enough to determine the chemical form of these elements at the low levels found in cereal grains. It will show how much of the iron will be available when it reaches the consumer.
Photo: Tri-colour map of: Fe (red), Cu (green) and Zn (blue) in a grain of barley.
Credit: Enzo Lombi
Centre for Environmental Risk Assessment and Remediation, Enzo Lombi, Tel: +61 8 830 26267, Enzo.Lombi@unisa.edu.au
A Flinders University chemist is using Australia’s OPAL research reactor at Lucas Heights in Sydney to investigate ancient Aboriginal Australian society.
Using the technique called neutron activation analysis, Dr Rachel Popelka-Filcoff can “geochemically fingerprint” Aboriginal ochre pigments from different locations, archaeological sites and artefacts. As the geochemical composition of ochre varies with location, she can correlate each sample with its site of origin, gaining information on cultural practices, travel and exchange patterns, and the relationship of Aboriginal people to the landscape. “Ochre pigments are highly significant in Aboriginal culture,” says Rachel. “Cultural expression often requires a specific pigment. Applying ochre to an object such as a spear can transform both its colour and its cultural meaning.”
Dr Roman Dronov, also from Flinders, is using the reactor to study the formation of bacterial protein layers. He is applying what he finds to constructing a new type of biosensor based on these layers and porous silicon. These highly sensitive devices can rapidly detect trace amounts of molecules, such as environmental poisons and markers of disease—a great improvement on traditional analytical methods. Continue reading OPAL reactor fingerprints Aboriginal ochre→
Australian engineers and physicists have developed a ‘single electron reader’, one of the key building blocks needed to make a quantum computer.
Quantum computers will use the spin, or magnetic orientation, of individual electrons for their calculations. And, because of the quantum nature of electrons, quantum computers could be exponentially faster at certain tasks than traditional computers.
In order to employ electron spin, a quantum computer needs both a way of changing the spin state (writing information) and of measuring that change (reading information). Together these two form a quantum bit or qubit – the equivalent of the bit in a conventional computer. Continue reading Computing with a single electron→
Imagine printing your own room lighting, lasers, or solar cells from inks you buy at the local newsagent. Jacek Jasieniak and colleagues at CSIRO, the University of Melbourne and the University of Padua in Italy, have developed liquid inks based on quantum dots that can be used to print such devices and in the first demonstration of their technology have produced tiny lasers. Quantum dots are made of semiconductor material grown as nanometre-sized crystals, around a millionth of a millimetre in diameter. The laser colour they produce can be selectively tuned by varying their size.
High tech cling wraps that ‘sieve out’ carbon dioxide from waste gases can help save the world, says Melbourne University chemical engineer, Colin Scholes who developed the technology. The membranes can be fitted to existing chimneys where they capture CO2 for removal and storage. Not only are the new membranes efficient, they are also relatively cheap to produce. They are already being tested on brown coal power stations in Victoria’s La Trobe Valley, Colin says. “We are hoping these membranes will cut emissions from power stations by up to 90 per cent.”
Australia’s scientific approach to grape growing and winemaking means that you can be confident in what you’re buying when you drink Australian wines. And that’s helped Australian wine become the market leader in the UK and second behind Italy in the US market.