800 research outputs found
Understanding Risk Extrapolation (REx) and when it finds Invariant Relationships
No full textGeneralizing models for new unknown datasets is a common problem in machine learning. Algorithms that perform well for test instances with the same distribution as their training dataset often perform severely on new datasets with a different distribution. This problem is caused by distributional shifts between the training of the model and applying that model to a test domain. This paper addresses whether and in what situations Risk Extrapolation (REx) can tackle this problem of Out-Of-Distribution generalization by exploiting invariant relationships. These relationships are based on features that are invariant across all domains. By learning these relationships, REx aims to learn the concept of the problem we are trying to solve. We show in what situations REx can learn these invariant relationships and when it does not. We translate the definition of an invariant relationship into a homoscedastic synthetic dataset with either covariate, confounded, anti-causal, or hybrid shift. We expose REx to experiments in sample complexity, the number of training domains, and the training domain distance. We show that REx performs better for invariant prediction in situations with larger sample sizes and training domain distance and that if these criteria are met, REx performs equivalently in all four distributional shifts. We also compare REx to Invariant- and Empirical Risk Minimization and show that; REx is less sensitive and thus robust to the shifting of the average distributional variance in the training domains; REx asymptotically out-performs the methods in the more complex distributional shifts.https://gitlab.com/hofland.jeroen/rex-distributional-shift CodeCSE3000 Research ProjectComputer Science and Engineerin
Rex J. Rowley
No full textAudio recording of the 10/06/13 UNLV Libraries Author Series event featuring Rex. J. Rowley, author of Everyday Las Vegas: Local Life in a Tourist Town. Includes remarks by Libraries Dean Patricia Iannuzzi, CGR Director Dave Schwartz, and Rowley
Memo from Rex J. Stanton, Supt., Heart Mountain Relocation Projec,t to Mr. Shoji Nagumo, January 16, 1943
No full textMemorandum of understanding from Rex Stanton to Shoji Nagumo regarding a job opening for a plumber-fireman position at Heart Mountain incarceration camp.The Japanese American Archival Collection documents the people, places, and daily life of Japanese Americans, primarily those who lived in the once thriving community of pre-war Florin in the Sacramento region, as well as the conditions in American incarceration camps during World War II. The approximately 7,000 original items include personal and official letters, photographs, diaries, arts and crafts, newsletters, textiles, camps artifacts, yearbooks and other publications
FIRST DETECTION OF COHERENT ELASTIC NEUTRINO-NUCLEUS SCATTERING ON AN ARGON TARGET
No full textThesis (Ph.D.) - Indiana University, Department of Physics, 2020Coherent elastic neutrino-nucleus scattering (CEvNS) was first proposed in 1974 but eluded
detection for 40 years. The COHERENT collaboration made the first observation of CEvNS at the
Oak Ridge National Laboratory Spallation Neutron Source (SNS) with a 14.6 kg CsI[Na] detector.
One of the physics goals of the COHERENT experiment is to test the square of the neutron number
dependence of the CEvNS cross section predicted in the Standard Model by observing CEvNS in
multiple nuclei. To that end, the ~24 kg CENNS-10 liquid argon detector was deployed at the
low-background Neutrino Alley at the SNS in early 2017. The detector was upgraded to allow for
sensitivity to CEvNS in mid-2017. We analyzed 1.5 years of data taken after this upgrade to provide
the first detection of CEvNS on an argon nucleus at > 3 significance. The measured CEvNS cross
section of (2.30.7) x 10cm, averaged over the incident neutrino flux, is consistent with the
Standard Model prediction. This result represents a detection of CEvNS on the lightest nuclei
so far and improves bounds on beyond-the-standard-model physics in the form of non-standard
neutrino interactions
A First Search for Coherent Elastic Neutrino-Nucleus Scattering with Liquid Argon
No full textThesis (Ph.D.) - Indiana University, Department of Physics, 2019First proposed by Freedman in 1974, coherent elastic neutrino-nucleus scattering (CEvNS) is the dominant low energy neutrino coupling and provides a window to many interesting areas of physics research: nuclear structure, physics beyond the Standard Model, and supernovae evolution and detection. The COHERENT collaboration recently observed CEvNS with a low background 14.6 kg CsI[Na] crystal at the Spallation Neutron Source (SNS) at Oak Ridge National Lab. A primary goal of COHERENT is to measure the dependence of the CEvNS cross section. To that end, COHERENT has deployed the single-phase liquid argon detector CENNS-10 to provide a low measurement of the cross section. CENNS-10 completed an Engineering Run in the spring of 2017. From this analysis, a vital in-situ measurement of the beam-related neutron flux in liquid argon, relevant for future measurements, was made and a limit on the CEvNS cross section on argon, consistent with the Standard Model prediction, was placed. Finally, implications for non-standard neutrino interactions were investigated
CEvNS with a liquid argon scintillation detector
No full textThe COHERENT collaboration is deploying a suite of low-energy detectors in a low back- ground corridor of the ORNL Spallation Neutron Source (SNS) to measure coherent elastic neutrino nucleus scattering (CEvNS) on an array of nuclear targets employing different technologies. A measurement of CEvNS on different nuclei will test the N2-dependence of the CEvNS cross section and further the physics reach of the COHERENT effort. The first step of this program has been realized recently with the observation of CEvNS in a 14.6 kg CsI detector. A 22 kg, single-phase, LAr detector (CENNS-10) started data-taking in Dec. 2016 and will provide results on CEvNS from a much lighter nucleus. The design, performance, and backgrounds of the CENNS-10 detector will be presented.
This presentation was used for the Low-Radioactivity Underground Argon Workshop held at Pacific Northwest National Laboratory in Richland, Washington on March 19 - 20, 2018.</p
Peter B. Maling, Christchurch, New Zealand [picture] /
No full textTitle devised from compactus card.; Inscriptions: "Peter B. Maling. Photograph for reference"--On compactus card, "Print U/1633 11535"--In pencil on verso; photographers stamp.; Rex Nan Kivell Collection NK11535.; Also available online http://nla.gov.au/nla.pic-vn6093270. Dr Peter B. Maling is a New Zealand author and historian. He was a friend and correspondent of Rex Nan Kivell
Measurement of CEvNS with a liquid argon detector at the ORNL SNS
No full textPresentation given at the Magnificent CEvNS workshop (2018) focused on the future plans and physics sensitivities of a ton-scale liquid argon detector effort within the COHERENT Collaboration.</p
Innovation : an expert's insight on the issue in Arizona
No full textabstract: Innovation—introducing something new—in the 21st century mostly derives from technological advances. Innovation drives the modern economy, leading to gains in productivity and prosperity. In this edition of Indicator Insight, author Tom Rex discusses innovation in Arizona in terms of human capital, financial capital, and high-technology employment.Indicator insight ; volume 3, issue 3The Arizona Indicators Panel is a partnership of Arizona State University, The Arizona Republic, Arizona Community Foundation, Valley of the Sun United Way, and the Arizona Dept. of Commerce
William Cobbett, author of the Political Register [picture]
No full textFacsimile autograph: Wm. Cobbett.; Catalogue of engraved British portraits; engraved by D. Maclise.; Also available in an electronic version via the Internet at: http://nla.gov.au/nla.pic-an9351838; Rex Nan Kivell Collection NK10965.; U6467
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