ORNL licenses revolutionary AI system to General Motors for automotive use
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Neutrons reveal unpredicted binding between SARS-CoV-2, hepatitis C antiviral drug
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DOE/Oak Ridge National Laboratory
Nesaraja evaluates mass chains assigned to nuclear data program centers like ORNL. She selects best values for archiving in a specialized nuclear structure database and publication. (Credit: Carlos Jones/ORNL, U.S. Dept. of Energy)
Nuclear physicist Caroline Nesaraja of the Department of Energy s Oak Ridge National Laboratory evaluates nuclear data vital to applied and basic sciences. Her work ensures that the scientific community has the best nuclear data for fundamental research and applications including medical isotopes, nuclear energy and national and international security. At the heart of nuclear data evaluation is recommending values for a range of nuclear properties for the community to adopt and use, said Nesaraja. Her exacting evaluation process starts with gathering extensive nuclear structure and decay data from experimental measurements published in peer-reviewed journals.
Around the mid-1990s, something fundamental changed in the nature of machining. Machine tools specifically, CNC machining centers became widely capable of milling at sufficiently high spindle speeds and metal removal rates that the dynamics of the machining system started to matter. Process characteristics related to vibration and natural frequency became potentially significant for determining the performance of the cut.
Machining fundamentals have never quite caught up. Machining fundamentals as they are typically taught still tend to assume a milling pass as it might be performed on a manual mill, in which the tool can be modeled as a rigid cylinder and the part can be modeled as a rigid prism. The reality: In CNC machining, if the milling pass is programmed to run at what might be considered a reasonable production rate in aluminum or steel today, then the tool is deflecting and oscillating, the workpiece likely is as well, and these motions have to be appreciated as a poten