Oak Ridge Today

CNS research teams named 2015 R&D 100 Award finalists

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LISe Thermal Neutron Imager Sensor Board

The LISe Thermal Neutron Imager sensor board bears the Y‑12 and UT logos. At the center is the lithium crystal that creates the images. The imager is nominated for a 2015 R&D 100 Award. (Photo by Y-12 National Security Complex)

 

CNS partners with universities on significant technology advances

Two teams of Consolidated Nuclear Security LLC researchers at the Y-12 National Security Complex are finalists in the 2015 R&D 100 Awards program.

The LISe Thermal Neutron Imager, or LTNI, and a sensor named ChIMES, which is short for Chemical Identification by Magneto-Elastic Sensing, were selected as finalists by a panel of 70 independent judges. The winners will be announced November 13 at the conference in Las Vegas.

LTNI (pronounced litany) was developed through a collaboration with three Tennessee universities—the University of Tennessee, Fisk University, and Vanderbilt University. The imager builds upon a lithium crystal that won an R&D 100 Award in 2013. Applications for the imager include research, diagnostics/medical imaging, law enforcement, and national security. [Read more…]

Two UT College of Engineering groups finalists for R&D 100 List

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By University of Tennessee

The University of Tennessee College of Engineering recently got some good news, as R&D Magazine named two research groups to its list of finalists for the R&D 100.

The joint UT-Y12 Lithium Indium Diselenide Thermal Neutron Imager (LTNI) project includes Assistant Professor Eric Lukosi and Y-12 Joint Assistant Professor Ashley Stowe, both of nuclear engineering, while the joint UT-Oak Ridge National Laboratory Universal Grid Monitoring and Analyzing System (UGMAS) includes Governor’s Chair Yilu Liu, Research Assistant Professor Yong Liu, and Lingwei Zhan of electrical engineering and computer science.

A panel of judges and editors selected groups for inclusion as nominees based on the magazine’s determination of the most technologically significant products introduced in the past year. [Read more…]

ORPD officer, a former Vandy standout, terminated as statutory rape allegation investigated

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ORPD Cassen Garrison

Witnesses said ORPD Officer Cassen Garrison used his hands to break out a back window of an Emory Valley Center van and rescue a client from the back of it after a May 12, 2015, crash at Northwestern and North Purdue avenues. (File photo by John Huotari/Oak Ridge Today)

 

Note: This story was last updated at 9:25 a.m. Aug. 18.

A probationary Oak Ridge police officer who once played football for Vanderbilt University and the Kansas City Chiefs has been investigated, terminated, and will be prosecuted for allegations of statutory rape of a 16-year-old girl and other charges, authorities said Monday.

The victim’s stepfather, who was in custody at the Anderson County Detention Facility in Clinton, made an allegation that the officer, Cassen Jackson-Garrison, 30, had engaged in inappropriate contact with his stepdaughter, Anderson County District Attorney General Dave Clark said in a press release. The allegation was made to an Anderson County Sheriff’s Department deputy investigator at the jail.

Clark said Garrison was one of two officers who met the victim when he responded to the victim’s home in connection with a domestic violence complaint. The victim’s stepfather was arrested because of that complaint and remains jailed at the ACDF, Clark said. [Read more…]

ORNL scientists uncover clues to role of magnetism in iron-based superconductors

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Magnetism of Iron-based Superconductors

Oak Ridge National Laboratory scientists used scanning transmission electron microscopy to measure atomic-scale magnetic behavior in several families of iron-based superconductors. (Photo courtesy ORNL)

 

New measurements of atomic-scale magnetic behavior in iron-based superconductors by researchers at Oak Ridge National Laboratory and Vanderbilt University are challenging conventional wisdom about superconductivity and magnetism.

The study published in Advanced Materials provides experimental evidence that local magnetic fluctuations can influence the performance of iron-based superconductors, which transmit electric current without resistance at relatively high temperatures.

“In the past, everyone thought that magnetism and superconductivity could not coexist,” said ORNL’s Claudia Cantoni, the study’s first author. “The whole idea of superconductors is that they expel magnetic fields. But in reality things are more complicated.”

Superconductivity is strongly suppressed by the presence of long-range magnetism—where atoms align their magnetic moments over large volumes—but the ORNL study suggests that rapid fluctuations of local magnetic moments have a different effect. Not only does localized magnetism exist, but it is also correlated with a high critical temperature, the point at which the material becomes superconducting. [Read more…]

Steve Fritts seeks re-election to Anderson County School Board

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Steve Fritts

Steve Fritts

Steve Fritts is seeking re-election to the Anderson County School Board in District 7, which includes the Pine Valley, Glenwood, and Highland View precincts in Oak Ridge.

Fritts, who has lived in the district since his youth, was first elected in 2010, a press release said.

Fritts graduated from Oak Ridge High School in 1967, and he was an All-State football player, the release said. He graduated from Vanderbilt University with a bachelor’s degree in history. Fritts also served as captain of the Vanderbilt Commodore football team in the early ’70s.

Fritts worked as a carpenter until his retirement and was a member of Local 50. [Read more…]

ORNL awarded two Energy Frontier Research Centers

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David Wesolowski and Yanwen Zhang

Pictured above are David Wesolowski, left, director of the Fluid Interface Reactions, Structures, and Transport Center; and Yanwen Zhang, director of the Energy Dissipation to Defect Evolution Center. (Photo courtesy ORNL)

Oak Ridge National Laboratory will be home to two Energy Frontier Research Centers announced this week by U.S. Energy Secretary Ernest Moniz. The Department of Energy awarded a total of $100 million to 32 EFRC projects to accelerate the scientific breakthroughs needed to build the 21st-century energy economy. 

“Today, we are mobilizing some of our most talented scientists to join forces and pursue the discoveries and breakthroughs that will lay the foundation for our nation’s energy future,” Secretary Moniz said. “The funding we’re announcing today will help fuel scientific and technological innovation.”

The two ORNL EFRCs are a renewal of the Fluid Interface Reactions, Structures, and Transport (FIRST) Center, which is led by David Wesolowski, and a new award to the Energy Dissipation to Defect Evolution (EDDE) Center, led by Yanwen Zhang.

ORNL scientists also partnered on successful proposals to lay the groundwork for fundamental advances in solar energy, electrical energy storage, carbon capture and sequestration, materials and chemistry by design, biosciences, and extreme environments. Those proposals include three new projects (led by the Georgia Institute of Technology, the State University of New York–Stony Brook, and Pennsylvania State University) and three renewals (led by Washington University in St. Louis, Lawrence Berkeley National Laboratory, and the Massachusetts Institute of Technology). [Read more…]

‘Atomic switcheroo’ explains origins of thin-film solar cell mystery

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Current Maps

Cross-sectional electron beam-induced current maps show the difference in cadmium telluride solar cells before (pictured above) and after (below) cadmium chloride treatment. The increased brightness after treatment indicates higher current collection at the grain boundaries. (Submitted photo)

Treating cadmium-telluride (CdTe) solar cell materials with cadmium-chloride improves their efficiency, but researchers have not fully understood why. Now, an atomic-scale examination of the thin-film solar cells led by Oak Ridge National Laboratory has answered this decades-long debate about the materials’ photovoltaic efficiency increase after treatment.

A research team from ORNL, the University of Toledo, and the U.S. Department of Energy’s National Renewable Energy Laboratory used electron microscopy and computational simulations to explore the physical origins of the unexplained treatment process. The results are published in Physical Review Letters, or PRL.

Thin-film CdTe solar cells are considered a potential rival to silicon-based photovoltaic systems because of their theoretically low cost per power output and ease of fabrication. Their comparatively low historical efficiency in converting sunlight into energy, however, has limited the technology’s widespread use, especially for home systems. [Read more…]

ORCMA chamber concert features Blair String Quartet

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Blair String Quartet

Blair String Quartet

The first chamber concert of the Oak Ridge Civic Music Association’s new season features the Blair String Quartet of Vanderbilt University in Nashville.

The quartet will play at 7:30 p.m. Saturday at Pollard Auditorium.

[Read more…]

Letter: Vanderbilt professor calls for diversity, religious freedom, political involvement

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Carol M. Swain

Carol M. Swain

A few weeks ago, I had the pleasure of visiting Knox County and meeting with some of the city’s movers and shakers. I was particularly impressed by the patriotism and faith of the people who attended an event hosted by Rep. John Ragan.

My presence in Rep. John Ragan’s district was to share with the community ideas and themes from my book, “Be the People: A Call to Reclaim America’s Faith and Promise.”

[Read more…]

Vanderbilt ‘whistle-blower’ to lecture in Oak Ridge on Friday

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A Vanderbilt University professor who is well-known for “blowing the whistle” on the school’s efforts to force Christian organizations off-campus will be the guest speaker at a Friday lecture hosted by state Rep. John Ragan, a campaign press release said.

The lecture by Carol Swain is at 7 p.m. at the Pollard Center Auditorium.

[Read more…]