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DTSTART;TZID=America/New_York:20210201T160000
DTEND;TZID=America/New_York:20210201T170000
DTSTAMP:20260416T193055
CREATED:20210105T210629Z
LAST-MODIFIED:20210130T030651Z
UID:17599-1612195200-1612198800@physics.sciences.ncsu.edu
SUMMARY:Physics Colloquium: Daniel Phillips
DESCRIPTION:Title: Knowing What You Don’t Know: Nuclear Physics\, Effective Field Theory\, and Uncertainty Quantification \nAbstract: For almost a century physicists have devoted intense attention to teasing out the nature of the nuclear force. But there remains much that we do not know about the way neutrons and protons interact\, and the way that they come together to form nuclei. In this talk I will show how two tools–effective field theory and Bayesian probability theory—can provide quantitative assessments of the impact of the things that we don’t know about nuclear physics on experimental observables. \n\nHost: Sebastian Konig
URL:https://physics.sciences.ncsu.edu/event/physics-colloquium-daniel-phillips/
LOCATION:NC
CATEGORIES:College of Sciences Calendar,Colloquia
END:VEVENT
BEGIN:VEVENT
DTSTART;TZID=America/New_York:20210208T160000
DTEND;TZID=America/New_York:20210208T170000
DTSTAMP:20260416T193055
CREATED:20210119T211239Z
LAST-MODIFIED:20210205T170132Z
UID:17641-1612800000-1612803600@physics.sciences.ncsu.edu
SUMMARY:Physics Colloquium: Michael Huber
DESCRIPTION:Title: Studying Fundamental Physics and Material Science using Neutron Interference \nAbstract: The National Institute of Standards and Technology (NIST) in Gaithersburg\, MD operates a 20 MW reactor for neutron research.  Neutrons have several advantages over more common material probes like x-rays and electrons.  These include:  (1) neutrons transmit through most materials making them ideal to study bulk properties\, (2) the neutron carries a magnetic dipole moment enabling the study of magnetic samples\, and (3) with de Broglie wavelengths of a few angstroms\, neutrons are ideal probes of atomic structure.  It is the neutron’s wave-like property that allows for the use of interferometric techniques to be employed in high precision measurements.   \nNeutron interferometry is commonly done using a perfect-crystal silicon ingot machined to produce 2 or more blades on a common base.  Neutrons diffract inside the crystal blades to create 2 spatially separate paths. This type of interferometer is analogous to a Mach-Zehnder interferometer in optics.   Differences along the paths of the interferometer whether caused by physical samples or other forces change the relative phase between the 2 paths.   What makes perfect-crystal interferometry a compelling technique is its simple-to-interpret results and ability to manipulate neutrons by simple macroscopic elements.  Perfect-crystal neutron interferometry has been used to study nuclear physics\, quantum information\, gravity\, and place limits on cosmological models.     \nAnother popular neutron technique is that of neutron imaging. Neutron tomography has been successfully employed in such areas as the study of concrete\, lithium battery technology and in the development of hydrogen fuel cells.   Recently\, researchers at NIST and the NIH have demonstrated a neutron interferometer operating in the far-field using a series of phase gratings instead of perfect crystals. Combined with dark field imaging\, this type of interferometer allows access to structural features in a neutron image. In one sense\, this far-field interferometer bridges the gap between interferometric and imaging techniques.  The use of phase gratings eliminates the micron precision manufacturing and angstrom-level alignment requirements for perfect crystals potentially making the far-field interferometer a more prolific instrument.   Combined with the ability to obtain tomography\, dark field imaging with a far field interferometer opens the possibility of three-dimensional\, multi-scale data sets\, with pair correlation functions ranging from 1 nm to 10 µm.  \nNIST is developing the far-field interferometer denoted as INFER as a potential new user instrument to study inhomogeneous structures\, such as additively manufactured metal parts\, lithium batteries\, and porous media.  INFER’s advantages may prove invaluable for several experiments including a precision measurement of gravity.  The speaker will discuss using perfect-crystal\, neutron interferometry for fundamental physics and the development of the new far-field grating-based interferometer for material science.  \nBio: Dr. Michael G. Huber has been working in the field of neutron optics and interferometry since 2003.  His earliest work in neutron interferometry focused on providing high precision data for nuclear models.    In addition to interferometry\, Dr. Huber has worked on other experiments in fundamental physics such as measuring the neutron lifetime\, Schwinger scattering\, and the generation of spin-orbit states. He is the principle investigator for the 2 perfect-crystal interferometer facilities at NIST which operate with the generous support of several graduate students\, post-docs\, and external collaborators including NC State.  He is part of the INFER team developing far-field interferometry for wider scientific use.  \nHost: Albert Young
URL:https://physics.sciences.ncsu.edu/event/physics-colloquium-michael-huber/
LOCATION:NC
CATEGORIES:Colloquia
END:VEVENT
BEGIN:VEVENT
DTSTART;TZID=America/New_York:20210215T160000
DTEND;TZID=America/New_York:20210215T170000
DTSTAMP:20260416T193055
CREATED:20210105T212441Z
LAST-MODIFIED:20210211T131419Z
UID:17603-1613404800-1613408400@physics.sciences.ncsu.edu
SUMMARY:Physics Colloquium: Dapeng Bi
DESCRIPTION:Title: Origin of fluidity\, jamming and glassy behavior in biological tissues \nAbstract: Cells must move through tissues in many important biological processes\, including embryonic development\, cancer metastasis\, and wound healing. Often these tissues are dense and a cell’s motion is strongly constrained by its neighbors\, leading to glassy dynamics. Although there is a density-driven jamming transition in particulate matter\, these cannot explain liquid-to-solid transitions in tissues. I will demonstrate the existence of a new type of rigidity transition that occurs in confluent tissue monolayers at constant density. The onset of rigidity is governed by a model parameter that encodes single-cell properties such as cell-cell adhesion and cortical tension. I will also introduce a new model that simultaneously captures polarized cell motility and multicellular interactions in a confluent tissue and identify a glass transition line that originates at the critical point of the rigidity transition. This transition exhibits several hallmarks of a second-order phase transition\, such as a growing correlation length and a universal critical scaling. I will elucidate the nature of rigidity transitions in dense biological tissues and other cellular structures using a generalized Maxwell constraint counting approach. \nHost: Karen Daniels
URL:https://physics.sciences.ncsu.edu/event/physics-colloquium-dapeng-bi/
LOCATION:NC
CATEGORIES:College of Sciences Calendar,Colloquia
END:VEVENT
BEGIN:VEVENT
DTSTART;TZID=America/New_York:20210217T103000
DTEND;TZID=America/New_York:20210217T123000
DTSTAMP:20260416T193055
CREATED:20210204T142019Z
LAST-MODIFIED:20210204T142019Z
UID:17675-1613557800-1613565000@physics.sciences.ncsu.edu
SUMMARY:Preliminary Exam - Adam Lipman
DESCRIPTION:Ultra Cold Neutron Geometric Phases as False EDM Frequency Shifts
URL:https://physics.sciences.ncsu.edu/event/preliminary-exam-adam-lipman/
LOCATION:NC
CATEGORIES:In The Department
END:VEVENT
BEGIN:VEVENT
DTSTART;TZID=America/New_York:20210222T160000
DTEND;TZID=America/New_York:20210222T170000
DTSTAMP:20260416T193055
CREATED:20210105T213125Z
LAST-MODIFIED:20210219T172847Z
UID:17606-1614009600-1614013200@physics.sciences.ncsu.edu
SUMMARY:Physics Colloquium: Claudia Ratti
DESCRIPTION:Title: Properties of hot and dense matter from first principles. \n\nAbstract: The Large Hadron Collider (LHC) and the Relativistic Heavy Ion Collider (RHIC) are creating the most ideal fluid ever observed\, the quark-gluon plasma\, by smashing together heavy nuclei at relativistic energies. This phase of matter existed only a few microseconds after the big bang. I will review the state of the art of lattice QCD simulations at finite temperature and density\, which reveal the properties of this phase of matter and the temperature and density at which it is created. I will then discuss phenomenological methods to extend these results to higher densities and connect them to the Second Beam Energy Scan program at RHIC.\n\n\nHost: Vladimir Skokov
URL:https://physics.sciences.ncsu.edu/event/physics-colloquium-claudia-ratti/
LOCATION:NC
CATEGORIES:College of Sciences Calendar,Colloquia
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