Computer Science and Mathematics Division Archives

Four ORNL researchers elected fellows of American Physical Society

Posted at 8:43 pm November 23, 2015
By Oak Ridge National Laboratory Leave a Comment

Jaime Fernandez-Baca (Photo courtesy ORNL)

Four researchers from Oak Ridge National Laboratory have been elected fellows of the American Physical Society, one of the nation’s top professional organizations for scientists.

Jaime Fernandez-Baca, Sergei Kalinin, Mark Lumsden, and Thomas Maier were selected for the honor by the APS Council of Representatives. They will be formally recognized at the APS’s March meeting.

Fernandez-Baca, a distinguished research staff member in the Quantum Condensed Matter Division in ORNL’s Neutron Science Directorate, was recognized by the APS Division of Materials Physics “for seminal neutron scattering studies of magnetic materials, especially the spin and lattice dynamics of colossal magnetoresistive manganites.”

Fernandez-Baca’s research is performed mainly at ORNL’s High Flux Isotope Reactor, where he is the lead for the Triple Axis Spectroscopy group. His expertise is in the study of the magnetic ordering and spin dynamics of complex oxides and related alloys using neutron scattering techniques.

He was the recipient of the International Atomic Energy Agency fellowship, the DOE Office of Science Outstanding Mentor Award (2008), and the Neutron Scattering Society of America Distinguished Service Award (2014). [Read more…]

Four ORNL scientists selected for early career research funding

Posted at 11:30 pm May 17, 2015
By Oak Ridge National Laboratory Leave a Comment

Projects by, from left, ORNL researchers Christian Engelmann, Cory Hauck, Katharine Page, and Chad Parish have been selected for DOE Early Career funding. (Photo by ORNL)

Four researchers at the U.S. Department of Energy’s Oak Ridge National Laboratory are among 44 scientists selected by DOE’s Office of Science to receive funding under the department’s Early Career Research Program.

The grants, which are intended to support researchers during their crucial early career years, are at least $500,000 per year for national lab researchers to cover year-round salary plus research expenses over a planned five years.

ORNL’s winners fall within three major Office of Science program offices: Advanced Scientific Computing Research (ASCR), Basic Energy Sciences (BES) and Fusion Energy Sciences (FES). Following are ORNL’s selectees and brief descriptions of their projects. [Read more…]

Science: ORNL researchers tune friction in ionic solids at the nanoscale

Posted at 10:54 pm January 27, 2015
By Oak Ridge National Laboratory Leave a Comment

Researchers used electricity and water to control friction levels on ionic surfaces at the nanoscale. As water forms around the nanoscale electrode, it allows for further penetration into the sample surface, thereby increasing or decreasing friction. (Image courtesy ORNL)

Friction impacts motion, hence the need to control friction forces. Currently, this is accomplished by mechanistic means or lubrication, but experiments conducted by researchers at the U.S. Department of Energy’s Oak Ridge National Laboratory have uncovered a way of controlling friction on ionic surfaces at the nanoscale using electrical stimulation and ambient water vapor.

The research, which demonstrates a new physical effect, was undertaken at the Center for Nanophase Materials Sciences, a DOE Office of Science User Facility at ORNL, and is published in the journal Scientific Reports.

“Our finding can have a significant technological impact on applications for both macroscopic and nanoscale devices,” said lead author Evgheni Strelcov. “Decreasing or increasing nanoscale friction at will and thus controlling mechanical energy losses and wear of a microelectromechanical system’s parts has enormous implications for applied energy research and opens a new vista for fundamental science studies.” [Read more…]

DOE report co-chaired by UT professor calls for renewed focus on high-end math research

Posted at 1:52 am March 22, 2014
By University of Tennessee Leave a Comment

Jack Dongarra

Professor also ORNL researcher, co-author of Top 500 ranking of the world’s most powerful supercomputers

KNOXVILLE—The U.S. Department of Energy recently released a report co-chaired by Jack Dongarra, a distinguished professor at the University of Tennessee in Knoxville, in which he stresses the importance of prioritizing research into high-end mathematics to help keep the United States on the cutting edge of computing.

“Exascale computing (capable of one quintillion floating point operations per second) will enable us to solve problems in ways that are not feasible today and will result in significant scientific breakthroughs,” said Dongarra, of UT’s Department of Electrical Engineering and Computer Science. “However, the transition to exascale poses numerous scientific and technological challenges.”

Dongarra, one of five National Academy of Engineering members on the faculty of UT’s College of Engineering, said that increased funding for the development of new models and ways of gathering data is key to unlocking a number of those challenges. [Read more…]

Chinese supercomputer still No. 1, ORNL’s Titan No. 2

Posted at 9:00 am November 18, 2013
By John Huotari 2 Comments

Titan Supercomputer at Oak Ridge National Laboratory

Titan at Oak Ridge National Laboratory stayed at No. 2 in a Top 500 ranking of the world’s most powerful supercomputers released Monday morning. (Photo courtesy of ORNL)

A Chinese supercomputer kept its top ranking, and Titan at Oak Ridge National Laboratory stayed at No. 2 in a Top 500 ranking of the world’s most powerful supercomputers released Monday morning.

The top two spots were unchanged from the semiannual rankings released five months ago in June, when Tianhe-2, a supercomputer developed by China’s National University of Defense Technology, bumped Titan from the top spot. The ORNL supercomputer had been named No. 1 one year ago.

The rankings released Monday at the SC13 conference in Denver, Colo., said Tianhe-2 is capable of performing 33.86 petaflops. That’s 33.86 quadrillion calculations per second, on what is known as a Linpack benchmark test.

Titan is a Cray XK7 system that achieved 17.59 petaflops. Titan is one of the most energy-efficient systems on the list, consuming a total of 8.21 megawatts and delivering 2.143 gigaflops per watt, a press release said. [Read more…]

Nazarewicz, Sumpter, Wullschleger named UT-Battelle Corporate Fellows

Posted at 11:09 am July 31, 2013
By Oak Ridge National Laboratory Leave a Comment

From left are Witold Nazarewicz, Bobby Sumpter, and Stan Wullschleger. (Photo courtesy Oak Ridge National Laboratory)

Witold Nazarewicz, Bobby Sumpter, and Stan Wullschleger of the U.S. Department of Energy’s Oak Ridge National Laboratory have been selected as 2013 UT-Battelle Corporate Fellows.

The rank of corporate fellow—among the lab’s highest honors—recognizes the researchers’ significant accomplishments and continuing leadership in their scientific, engineering, and technological fields. The addition of Nazarewicz, Sumpter and Wullschleger brings the number of active corporate fellows at ORNL to 33 researchers. [Read more…]

Theoretically twice as fast, Chinese supercomputer could bump Titan from No. 1 spot

Posted at 3:04 pm June 5, 2013
By John Huotari 15 Comments

Lights on the Chinese Tianhe-2 supercomputer, which has a theoretical peak that is twice as fast as the Titan supercomputer at Oak Ridge National Laboratory. (Photo courtesy Jack Dongarra)

A new Chinese supercomputer is theoretically twice as fast as the Titan supercomputer at Oak Ridge National Laboratory, and it could bump Titan from the No. 1 spot on the Top 500 list that will come out on June 17, one of the co-authors of the list said Wednesday.

Titan, which reached the No. 1 spot on the semiannual Top 500 list in November, has a theoretical peak of 27 petaflops, or roughly 27,000 trillion calculations per second.

The Chinese supercomputer, Tianhe-2, also known as TH-2 or Milkyway-2, has a theoretical peak of 54.9 petaflops. It also has about twice as much memory as the Titan system, said Jack Dongarra, a Top 500 co-author, University of Tennessee faculty member, and distinguished research staff member in ORNL’s Computer Science and Mathematics Division. [Read more…]