A5046199609- Particle physics theoretical and experimental studies
- Quantum Chromodynamics and Particle Interactions
- High-Energy Particle Collisions Research
- Black Holes and Theoretical Physics
- Advanced Data Storage Technologies
- Parallel Computing and Optimization Techniques
- Distributed and Parallel Computing Systems
- Radio Astronomy Observations and Technology
- Nuclear physics research studies
- Nuclear Physics and Applications
- Physics of Superconductivity and Magnetism
- Autopsy Techniques and Outcomes
- Tuberculosis Research and Epidemiology
- Pressure Ulcer Prevention and Management
- Traumatic Ocular and Foreign Body Injuries
- Superconducting Materials and Applications
- Markov Chains and Monte Carlo Methods
- Matrix Theory and Algorithms
- Neutrino Physics Research
- Atomic and Subatomic Physics Research
- Astrophysics and Cosmic Phenomena
- Musicology and Musical Analysis
- Cardiac Arrest and Resuscitation
- Cardiovascular Effects of Exercise
- Diagnosis and Treatment of Venous Diseases
Alder Hey Children's Hospital
2024
University of Liverpool
2024
Francophone University Association
2024
John Brown University
2024
Nvidia (United States)
2013-2023
Lawrence Berkeley National Laboratory
2016-2023
Medical College of Wisconsin
2023
Michigan State University
2002-2022
University of California, Berkeley
2006-2022
University of North Carolina at Chapel Hill
2022
The sudden, catastrophic release of gas from Lake Nyos on 21 August 1986 caused the deaths at least 1700 people in northwest area Cameroon, West Africa. Chemical, isotopic, geologic, and medical evidence support hypotheses that (i) bulk released was carbon dioxide had been stored lake's hypolimnion, (ii) victims exposed to cloud died asphyxiation, (iii) derived magmatic sources, (iv) there no significant, direct volcanic activity involved. limnological nature suggests hazardous lakes may be...
We have simulated QCD using 2+1 flavors of domain wall quarks on a $(2.74 {\rm fm})^3$ volume with an inverse lattice scale $a^{-1} = 1.729(28)$ GeV. The up and down (light) are degenerate in our calculations we used four values for the ratio light quark masses to strange (heavy) mass simulations: 0.217, 0.350, 0.617 0.884. measured pseudoscalar meson decay constants, kaon bag parameter $B_K$ vector couplings. SU(2) chiral perturbation theory, which assumes only small, SU(3) theory...
There has been much recent progress in the understanding and reduction of computational cost hybrid Monte Carlo algorithm for lattice QCD as quark mass parameter is reduced. In this letter we present a new solution to problem, where represent fermionic determinant using n pseudofermion fields, each with an nth root kernel. We implement within framework rational algorithm. compare other methods area find it competitive them.
This study retrospectively reviewed 142 fatal cases of aortic laceration. Data were collected from the autopsy reports (including toxicology results) and included circumstances injury. In case automobile crashes this direction impact, time day, vehicular damage. Seventy percent victims men with a mean age 37.5 years; 30% women 46 years. Thirty-five had elevated blood alcohol levels. Fifty-four lacerations located at classic site (the isthmus). The majority (102) sustained in crashes. Of...
A sodium pump inhibitor has been isolated from human plasma and extensively purified. This material, endogenous digitalislike factor, was examined by a variety of mass spectrometric techniques. low-resolution fast atom bombardment analysis sample purified factor revealed single unique molecular ion in the range 100-2,500. The accurate determined to be 585.295 Da second high-resolution experiment. Based on this mass, elemental composition found identical known cardenolide ouabain. Direct...
Abstract Background The clinical presentation of Clostridium difficile infection ranges from asymptomatic carriage, colitis with or without pseudomembranes, to fulminant colitis. Although not common, C. can result in bowel perforation and peritonitis a high mortality rate. Colectomy is often indicated these cases. Methods We retrospectively analysed the outcome 14 patients who underwent surgery for period 1996–2003 our Unit. Results indications were systemic toxicity ( n = 10), radiological...
First Nations communities in Canada experience disproportionately high levels of overcrowded housing, degree isolation, and rates tuberculosis (TB). A study was done to assess the association between housing density, occurrence TB communities.Average persons per room (ppr), isolation type, average household income, population, cases (1997-1999) at community level were entered into a database. Tuberculosis notification 95% CI calculated for different strata ppr isolation. Two multiple...
We present an adaptive multigrid solver for application to the non-Hermitian Wilson-Dirac system of QCD. The key components leading success our proposed algorithm are use projection onto coarse grids that preserves near null space matrix together with a simplified form correction based on so-called γ5-Hermitian symmetry Dirac operator. demonstrate nearly eliminates critical slowing down in chiral limit and it has weak dependence lattice volume.
We present results for light meson masses and pseudoscalar decay constants from the first of a series lattice calculations with $2+1$ dynamical flavors domain wall fermions Iwasaki gauge action. The work reported here was done at fixed spacing about 0.12 fm on ${16}^{3}\ifmmode\times\else\texttimes\fi{}32$ lattice, which amounts to spatial volume $(2\text{ }\text{ }\mathrm{fm}{)}^{3}$ in physical units. number sites fifth dimension is 16, gives ${m}_{\mathrm{res}}=0.00308(4)$ these...
Over the past five years, graphics processing units (GPUs) have had a transformational effect on numerical lattice quantum chromodynamics (LQCD) calculations in nuclear and particle physics. While GPUs been applied with great success to post-Monte Carlo "analysis" phase which accounts for substantial fraction of workload typical LQCD calculation, initial Monte "gauge field generation" requires capability-level supercomputing, corresponding O(100) or more. Such strong scaling has not...
Abstract A host of new low-frequency radio telescopes seek to measure the 21 cm transition neutral hydrogen from early universe. These have potential directly probe star and galaxy formation at redshifts 20 ≳ z 7 but are limited by dynamic range they can achieve against foreground sources emission. Consequently, there is a growing demand for modern, high-fidelity maps sky frequencies below 200 MHz use in modeling removal. We describe wide-field imaging technique drift-scanning...
Observation of neutrinoless double beta decay, a lepton number violating process that has been proposed to clarify the nature neutrino masses, spawned an enormous world-wide experimental effort. Relating nuclear decay rates high-energy, beyond Standard Model (BSM) physics requires detailed knowledge non-perturbative QCD effects. Using lattice QCD, we compute necessary matrix elements short-range operators, which arise due heavy BSM mediators, contribute this via leading order $\pi^- \to...
We report on the first application of stochastic Laplacian Heaviside method for computing multi-particle interactions with lattice QCD to two-nucleon system. Like method, this allows construction interpolating operators which can be used construct a positive definite set correlation functions, unlike nearly all other applications two nucleons in literature. It also variational analysis optimal linear combinations are formed that couple predominantly eigenstates Utilizing such methods has...
We present a new multigrid solver that is suitable for the Dirac operator in presence of disordered gauge fields. The key behind success algorithm an adaptive projection onto coarse grids preserves near null space. resulting has weak dependence on coupling and exhibits very little critical slowing down chiral limit. Results are presented Wilson-Dirac 2D U(1) Schwinger model.
Graphics Processing Units (GPUs) are having a transformational effect on numerical lattice quantum chromo- dynamics (LQCD) calculations of importance in nuclear and particle physics. The QUDA library provides package mixed precision sparse matrix linear solvers for LQCD applications, supporting single GPUs based NVIDIA's Compute Unified Device Architecture (CUDA). This library, interfaced to the QDP++/Chroma framework calculations, is currently production use "9g" cluster at Jefferson...
We discuss techniques for evaluating sea quark contributions to hadronic form factors on the lattice and apply these an exploratory calculation of strange electromagnetic, axial, scalar nucleon. employ Wilson gauge fermion actions anisotropic 24^3 x 64 lattice, probing a range momentum transfer with Q^2 < 1 GeV^2. The electric magnetic factors, G_E^s(Q^2) G_M^s(Q^2), are found be small consistent zero within statistics our calculation. data favor negative value axial factor G_A^s(Q^2)...
We study the chiral condensate $<\bar{\psi} \psi>$ for an SU(3) gauge theory with $N_f$ massless Dirac fermions in fundamental representation when is increased from 2 to 6. For $N_f=2$, our lattice simulations of \psi >/F^3$, where $F$ Nambu-Goldstone-boson decay constant, agree measured QCD value. $N_f = 6$, this ratio shows significant enhancement, presaging even larger enhancement anticipated as increases further, toward critical value transition confinement infrared conformality.