105 research outputs found
Underwater sounds from ribbon seal, Phoca (Histriophoca) fasciata
This paper is not subject to U.S. copyright. The definitive version was published in Fishery Bulletin 75 (1977): 450-453.Intense downward frequency "sweeps" and broadband
"puffing" sounds were recorded underwater
in the presence of ribbon seal, Phoca (Histriophoca)
fasciata Zimmerman 1783. The recordings
were made in the waters off Savoonga, St.
Lawrence Island, Alaska, on 16, 17, 18, and 23
May 1967.Arctic Institute
of North America under contractural agreements
with the Office of Naval Research
Quantum Algorithm Implementations for Beginners
As quantum computers become available to the general public, the need has
arisen to train a cohort of quantum programmers, many of whom have been
developing classical computer programs for most of their careers. While
currently available quantum computers have less than 100 qubits, quantum
computing hardware is widely expected to grow in terms of qubit count, quality,
and connectivity. This review aims to explain the principles of quantum
programming, which are quite different from classical programming, with
straightforward algebra that makes understanding of the underlying fascinating
quantum mechanical principles optional. We give an introduction to quantum
computing algorithms and their implementation on real quantum hardware. We
survey 20 different quantum algorithms, attempting to describe each in a
succinct and self-contained fashion. We show how these algorithms can be
implemented on IBM's quantum computer, and in each case, we discuss the results
of the implementation with respect to differences between the simulator and the
actual hardware runs. This article introduces computer scientists, physicists,
and engineers to quantum algorithms and provides a blueprint for their
implementations
Light-quark connected intermediate-window contributions to the muon hadronic vacuum polarization from lattice QCD
We present a lattice-QCD calculation of the light-quark connected
contribution to window observables associated with the leading-order hadronic
vacuum polarization contribution to the anomalous magnetic moment of the muon,
. We employ the MILC Collaboration's isospin-symmetric
QCD gauge-field ensembles, which contain four flavors of dynamical
highly-improved-staggered quarks with four lattice spacings between -~fm and close-to-physical quark masses. We consider several
effective-field-theory-based schemes for finite-volume and other lattice
corrections and combine the results via Bayesian model averaging to obtain
robust estimates of the associated systematic uncertainties. After unblinding,
our final results for the intermediate and ``W2'' windows are and , respectively
Report of the Snowmass 2021 Topical Group on Lattice Gauge Theory
Lattice gauge theory continues to be a powerful theoretical and computational
approach to simulating strongly interacting quantum field theories, whose
applications permeate almost all disciplines of modern-day research in
High-Energy Physics. Whether it is to enable precision quark- and lepton-flavor
physics, to uncover signals of new physics in nucleons and nuclei, to elucidate
hadron structure and spectrum, to serve as a numerical laboratory to reach
beyond the Standard Model, or to invent and improve state-of-the-art
computational paradigms, the lattice-gauge-theory program is in a prime
position to impact the course of developments and enhance discovery potential
of a vibrant experimental program in High-Energy Physics over the coming
decade. This projection is based on abundant successful results that have
emerged using lattice gauge theory over the years: on continued improvement in
theoretical frameworks and algorithmic suits; on the forthcoming transition
into the exascale era of high-performance computing; and on a skillful,
dedicated, and organized community of lattice gauge theorists in the U.S. and
worldwide. The prospects of this effort in pushing the frontiers of research in
High-Energy Physics have recently been studied within the U.S. decadal Particle
Physics Planning Exercise (Snowmass 2021), and the conclusions are summarized
in this Topical Report.Comment: 57 pages, 1 figure. Submitted to the Proceedings of the US Community
Study on the Future of Particle Physics (Snowmass 2021). Topical Group Report
for TF05 - Lattice Gauge Theor
IOTA: recent technology and science
Closure-phase science and technology are dominant features of the recent activity at IOTA. Our science projects include imaging several spectroscopic binary stars, imaging YSOs including Herbig AeBe stars, detecting asymmetries in a large sample of Mira stars, and measuring water shells around Miras. Many technology projects were pursued in order to make these science observations possible. These include installation of a third-generation integrated-optics 3-beam combiner (IONIC), completion of the real-time control system software, installation of fringe-packet tracking software, use of narrow sub-H band filters, validation of the phase-closure operation, development of CPLD control of the science camera (PICNIC) and star-tracker camera (LLiST), installation of a new star-tracker camera, expansion of the observing facility, and installation of new semi-automated optical alignment tools
The management and outcome for patients with chronic subdural hematoma: a prospective, multicenter, observational cohort study in the United Kingdom
Symptomatic chronic subdural hematoma (CSDH) will become an increasingly common presentation in neurosurgical practice as the population ages, but quality evidence is still lacking to guide the optimal management for these patients. The British Neurosurgical Trainee Research Collaborative (BNTRC) was established by neurosurgical trainees in 2012 to improve research by combining the efforts of trainees in each of the United Kingdom (UK) and Ireland's neurosurgical units (NSUs). The authors present the first study by the BNTRC that describes current management and outcomes for patients with CSDH throughout the UK and Ireland. This provides a resource both for current clinical practice and future clinical research on CSDH
Lattice QCD and Particle Physics
Contribution from the USQCD Collaboration to the Proceedings of the US
Community Study on the Future of Particle Physics (Snowmass 2021).Comment: 27 pp. main text, 4 pp. appendices, 30 pp. reference
Alignment of the CMS silicon tracker during commissioning with cosmic rays
This is the Pre-print version of the Article. The official published version of the Paper can be accessed from the link below - Copyright @ 2010 IOPThe CMS silicon tracker, consisting of 1440 silicon pixel and 15 148 silicon strip detector modules, has been aligned using more than three million cosmic ray charged particles, with additional information from optical surveys. The positions of the modules were determined with respect to cosmic ray trajectories to an average precision of 3â4 microns RMS in the barrel and 3â14 microns RMS in the endcap in the most sensitive coordinate. The results have been validated by several studies, including laser beam cross-checks, track fit self-consistency, track residuals in overlapping module regions, and track parameter resolution, and are compared with predictions obtained from simulation. Correlated systematic effects have been investigated. The track parameter resolutions obtained with this alignment are close to the design performance.This work is supported by FMSR (Austria); FNRS and FWO (Belgium); CNPq, CAPES, FAPERJ,
and FAPESP (Brazil); MES (Bulgaria); CERN; CAS, MoST, and NSFC (China); COLCIENCIAS
(Colombia); MSES (Croatia); RPF (Cyprus); Academy of Sciences and NICPB (Estonia);
Academy of Finland, ME, and HIP (Finland); CEA and CNRS/IN2P3 (France); BMBF, DFG,
and HGF (Germany); GSRT (Greece); OTKA and NKTH (Hungary); DAE and DST (India); IPM (Iran); SFI (Ireland); INFN (Italy); NRF (Korea); LAS (Lithuania); CINVESTAV, CONACYT,
SEP, and UASLP-FAI (Mexico); PAEC (Pakistan); SCSR (Poland); FCT (Portugal); JINR (Armenia, Belarus, Georgia, Ukraine, Uzbekistan); MST and MAE (Russia); MSTDS (Serbia); MICINN and CPAN (Spain); Swiss Funding Agencies (Switzerland); NSC (Taipei); TUBITAK and TAEK (Turkey); STFC (United Kingdom); DOE and NSF (USA)
Commissioning and performance of the CMS pixel tracker with cosmic ray muons
This is the Pre-print version of the Article. The official published verion of the Paper can be accessed from the link below - Copyright @ 2010 IOPThe pixel detector of the Compact Muon Solenoid experiment consists of three barrel layers and two disks for each endcap. The detector was installed in summer 2008, commissioned with charge injections, and operated in the 3.8 T magnetic field during cosmic ray data taking. This paper reports on the first running experience and presents results on the pixel tracker performance, which are found to be in line with the design specifications of this detector. The transverse impact parameter resolution measured in a sample of high momentum muons is 18 microns.This work is supported by FMSR (Austria); FNRS and FWO (Belgium); CNPq, CAPES, FAPERJ,
and FAPESP (Brazil); MES (Bulgaria); CERN; CAS, MoST, and NSFC (China); COLCIENCIAS (Colombia); MSES (Croatia); RPF (Cyprus); Academy of Sciences and NICPB (Estonia);
Academy of Finland, ME, and HIP (Finland); CEA and CNRS/IN2P3 (France); BMBF, DFG,
and HGF (Germany); GSRT (Greece); OTKA and NKTH (Hungary); DAE and DST (India); IPM (Iran); SFI (Ireland); INFN (Italy); NRF (Korea); LAS (Lithuania); CINVESTAV, CONACYT,
SEP, and UASLP-FAI (Mexico); PAEC (Pakistan); SCSR (Poland); FCT (Portugal); JINR (Armenia, Belarus, Georgia, Ukraine, Uzbekistan); MST and MAE (Russia); MSTDS (Serbia); MICINN and CPAN (Spain); Swiss Funding Agencies (Switzerland); NSC (Taipei); TUBITAK and TAEK (Turkey); STFC (United Kingdom); DOE and NSF (USA)
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