Press Releases

HPCS 2012 and BCNET have opened registration and launched the event website for this year’s conference in Vancouver, BC. Co-hosted by WestGrid, Compute Canada and BCNET, the event is themed Connect. Compute. Collaborate. and will take place May 1-3, 2012. The three-day program is expected to draw nearly 500 delegates from post-secondary institutions, research organizations and technology-driven industries from across Canada. A call for papers has been issued online, with a deadline of March 15th for abstract submissions. Topics areas for papers include, but are not limited to, the following subjects:

• Applications of HPC to any discipline in the physical, life and social sciences, and engineering
• Computer architectures
• Parallel/distributed/vector algorithms
• Grid or cloud computing and related tools
• Performance Modeling Evaluation
• Wide-area data transfer
• Management of large data sets
• Green HPC or energy-efficient data centres
• Visualization
• Systems and Management

Accepted papers presented as lectures or posters will be published online in the open access Journal of Physics: Conference Series (JPCS), which is published by the Institute of Physics Publishing in the UK. All papers published in JPCS are fully citable and upon publication will be free to download. Citations to JPCS papers are tracked online using IOP Publishing’s citing articles facility, in addition to the full citation tracking facilities provided by Scopus.

For more information, or to submit your abstract online, please visit the HPCS 2012 website or email 2012@hpcs.ca.

Hamilton, ON (Feb. 6, 2012) – Closing elementary and secondary schools can help slow the spread of infectious disease and should be considered as a control measure during pandemic outbreaks, according to a McMaster University led study.

Using high-quality data about the incidence of influenza infections in Alberta during the 2009 H1N1 flu pandemic, the researchers show that when schools closed for the summer, the transmission of infection from person to person was sharply reduced.

“Our study demonstrates that school-age children were important drivers of pH1N1 transmission in 2009,” says David Earn, lead author of the study published in Annals of Internal Medicine. Earn is professor in the Department of Mathematics and Statistics and member of McMaster’s Michael G. DeGroote Institute for Infectious Disease Research (IIDR).

Alberta was the only Canadian province to continue extensive virologic testing throughout the first wave and continuously to the middle of the second wave of the 2009 pandemic, allowing researchers to identify the causes of changes in incidence as the pandemic progressed.

“The data that we obtained were so good that our plots immediately revealed a huge drop in incidence when schools were closed for the summer,” says Earn. “Using state-of-the-art modeling, we then demonstrated that transmission was reduced by at least 50 per cent.”

The model also indicates that seasonal changes in weather significantly affected influenza transmission in cities in Alberta, but that they were much less important than school closures.

“Our study emphasizes the value of gathering data consistently throughout an outbreak,” says Earn. “For example, in Ontario they imposed testing restrictions on June 11, before schools had closed. We couldn’t possibly have done this analysis based on other parts of Canada.”

Earn and colleagues intend to continue to encourage policy makers to collect data through the course of an infectious disease outbreak. Only by swabbing large numbers of people throughout a pandemic, he says, the effects of various changes in behavior or control strategies are shown.

He adds that this article will help policy makers make the hard decision of whether or not to close schools during a pandemic outbreak.

“This strongly suggests that closing schools as a preventative measure is a strategy worth seriously thinking about. The next time a disease like SARS or the 1918 flu emerges, this paper will give policy makers more confidence that closing schools is likely to significantly reduce the rate of transmission.”

The study also involved McMaster investigators Jonathan Dushoff, associate professor of biology, and Mark Loeb, professor and division director of infectious diseases for the Michael G. DeGroote School of Medicine, who are also members of the IIDR.

The study received funding from the Canadian Institutes of Health Research, the Natural Sciences and Engineering Research Council of Canada, the Public Health Agency of Canada and McMaster’s Michael G. DeGroote Institute for Infectious Disease Research. Computing resources for simulations were provided by Compute Canada’s SHARCNET.

WATERLOO, Ont. (Friday, Jan. 13, 2012) – A three-member international team of theoretical physicists, including a University of Waterloo professor, made a notable discovery about the unusual behaviour of electrons, with implications for all of physics. Their findings appear today in Science, one of the world’s pre-eminent journals for original, peer-reviewed scientific research.

This work is a significant step in allowing physicists the rare opportunity to study seemingly impossible fractional particles. The research team includes professor Roger G. Melko of the Department of Physics and Astronomy at Waterloo, professor Matthew Hastings of the Department of Physics at Duke University in Durham, N.C. and also of Microsoft Research at the University of California, and lead author Sergei Isakov, a post-doctoral research associate with the Institut fur Theoretische Physik in Zurich, Switzerland. They used the computer power and capacity that Compute Canada’s Ontario-based supercomputing consortium SHARCNET provides to produce a simulation study that uncovered significant information about fractional particles when cooled to near absolute zero.

The researchers successfully created a simulated crystal of quantum material, which had just the right properties to be tuned to an unusual quantum state near absolute zero. When a particle with the fundamental electron charge was placed in that state, the team observed it fractionalize – or split itself – into two separate objects, each with a charge of half an electron. The researchers were then able to measure several values relating to the motion of the fractional particle. These numbers are universal, and so physicists can apply them across other areas of physics.

“What we have shown is not just that fractional particles can be created in a computer, but that they can affect universality at a phase transition. That means certainproperties transcend the specifics of the system, in our case the simulatedmaterial,” said Melko. “These properties will be present in other systems – physical, chemical, biological – that contain the same type of fractional particle. Thus, our work can be used to guide future studies looking for these odd half-electrons across a variety of disciplines.”

Rather than study high-energy systems, the team took advantage of the fact that low-temperature matter can come together to exhibit remarkable collective behaviour as quasiparticles. The motion of these cooperating particles, when viewed from a distance, is essentially indistinguishable from that of a regular, free particle. And, as they demonstrated in this paper, under just the right conditions, these quasiparticles can contain a fraction of the fundamental electron charge.

“The potential impact of our work is still unknown. The discovery of fractionalization in the quantum Hall effect revolutionized the way we think of matter. It won a Nobel Prize, and we are still building on this success,” said Melko. “Understanding these fractional particles could influence our understanding of superconductivity, help us build better electronics, and even play a part in the design of quantum computers in the future.”

The researchers’ article entitled “Universal Signatures of Fractionalized Quantum Critical Points” follows the team’s paper published last fall in the respected journal Nature Physics. That paper, which initially uncovered evidence for the existence of fractional particles in this low-temperature phase of matter was the result of months of collaboration and computer simulation work.