R. Handler
A5015399459- Particle physics theoretical and experimental studies
- High-Energy Particle Collisions Research
- Quantum Chromodynamics and Particle Interactions
- Fluid Dynamics and Turbulent Flows
- Dark Matter and Cosmic Phenomena
- Particle Detector Development and Performance
- Particle Dynamics in Fluid Flows
- Rheology and Fluid Dynamics Studies
- Wind and Air Flow Studies
- Fluid Dynamics and Vibration Analysis
- Particle Accelerators and Free-Electron Lasers
- Atomic and Subatomic Physics Research
- Ocean Waves and Remote Sensing
- Meteorological Phenomena and Simulations
- Oceanographic and Atmospheric Processes
- Advanced NMR Techniques and Applications
- Aerodynamics and Acoustics in Jet Flows
- Cosmology and Gravitation Theories
- Neutrino Physics Research
- Heat Transfer Mechanisms
- Tropical and Extratropical Cyclones Research
- Aeolian processes and effects
- Superconducting Materials and Applications
- Astrophysics and Cosmic Phenomena
- Computational Physics and Python Applications
George Mason University
2017-2025
Michigan Technological University
2023
Texas A&M University
2011-2017
Stanford University
2012
Naval Research Laboratory Remote Sensing Division
2001-2012
Center For Remote Sensing (United States)
2012
Palo Alto University
2012
United States Naval Research Laboratory
2002-2011
K Lab (United States)
2010
University of Wisconsin–Madison
2000-2009
In this work, we present from first principles a direct numerical simulation (DNS) of fully turbulent channel flow dilute polymer solution. The chains are modeled as finitely extensible and elastic dumbbells. algorithm is based on semi-implicit, time-splitting technique which uses spectral approximations in the spatial coordinates. computations carried out CRAY T3D parallel computer. simulations under conditions albeit, due to computational constraints, not at high Reynolds number that...
${\ensuremath{\Lambda}}^{0}$ polarization has been observed in $p+\mathrm{Be}\ensuremath{\rightarrow}{\ensuremath{\Lambda}}^{0}+\mathrm{anything}$ at 300 GeV. A total of 1.2 \ifmmode\times\else\texttimes\fi{} ${10}^{6}$ decays were recorded fixed lab angles between 0 and 9.5 mrad, covering a range kinematic variables $0.3<~x<~0.7$ $0<~{p}_{\ensuremath{\perp}}<~1.5$ GeV/c. The was consistent with parity conservation increased monotonically increasing ${p}_{\ensuremath{\perp}}$, independently...
The production and event topology of three-jet events produced in p¯p collisions at √s=1.8 TeV have been studied with the Collider Detector Fermilab Tevatron Collider. distributions angular variables (ψ∗ cosθ∗) describing energy sharing between jets (x3 x4) are found to agree well tree-level QCD calculations. These predicted different shapes for initial-state subprocesses (quark-antiquark, quark-gluon, gluon-gluon). data consistent small expected contribution from quark-antiquark initial...
An immersed boundary technique is used to model a riblet covered surface on one wall of channel bounding fully developed turbulent flow. The conjecture that the beneficial drag reduction effect riblets result damping cross-flow velocity fluctuations then examined. This possibility has been discussed by others but unverified. explicitly modelled applying force field in elongated streamwise zones with height and spacing corresponding crests. same trends are observed turbulence profiles above...
We present measurements of the pseudorapidity (η) distribution charged particles (dNchdη) produced within |η|≤3.5 in proton-antiproton collisions at √s 630 and 1800 GeV. measure dNchdη η=0 to be 3.18±0.06(stat)±0.10(syst) GeV, 3.95±0.03 (stat)±0.13(syst) Many systematic errors ratio two energies cancel, we 1.26±0.01±0.04 for GeV that |η|≤3. Comparing lower-energy data, observe an increase faster than ln(s) η=0.Received 2 October 1989DOI:https://doi.org/10.1103/PhysRevD.41.2330©1990 American...
Measurements of inclusive transverse-momentum spectra for charged particles produced in proton-antiproton collisions at √2 630 and 1800 GeV are presented compared with data taken lower energies.Received 8 June 1988DOI:https://doi.org/10.1103/PhysRevLett.61.1819©1988 American Physical Society
We have measured the polarization of 3\ifmmode\times\else\texttimes\fi{}${10;}^{6}$ ${\ensuremath{\Lambda}}^{0}$ and 2.5\ifmmode\times\else\texttimes\fi{}${10}^{5}$ ${\overline{\ensuremath{\Lambda}}}^{0}$ hyperons produced by 400-GeV protons on a beryllium target. The were detected at fixed angle 7.2 mrad in momentum range from 50 to 300 GeV/c for 200 ${\ensuremath{\Lambda}}^{0}$. agrees with that 24 GeV is - 0.24 \ifmmode\pm\else\textpm\fi{} 0.04 ${p}_{T}=2.1$ GeV/c. zero up ${p}_{T}=1.2$
The physical mechanisms by which the Reynolds shear stress is produced from dynamically evolving vortical structures in wall region of a direct numerical simulation turbulent channel flow are explored. complete set quasistreamwise vortices systematically located and tracked through locus points intersection their centres rotation with (y, z) grid planes. This approach assures positive identification widely differing strengths, including those whose amplitude changes significantly time....
A search for the top quark in p\ifmmode\bar\else\textasciimacron\fi{}p collisions at a center-of-mass energy of 1.8 TeV using Collider Detector Fermilab is described. study events selected by requiring an energetic electron, missing transverse energy, and two or more jets excludes 95% confidence level standard-model production decay tt\ifmmode\bar\else\textasciimacron\fi{} pairs if top-quark mass between 40 77 GeV/${c}^{2}$. The observed electron + multijet data are consistent with W-boson...
We present results from searches for the top quark pp\ifmmode\bar\else\textasciimacron\fi{} collisions at Fermilab Tevatron Collider. The data sample was collected during 1988--89 with Collider Detector and has an integrated luminosity of 4.1 ${\mathrm{pb}}^{\mathrm{\ensuremath{-}}1}$. Our previous search e\ensuremath{\mu} final states tt\ifmmode\bar\else\textasciimacron\fi{}\ensuremath{\rightarrow}e\ensuremath{\nu}b \ensuremath{\mu}\ensuremath{\nu}b\ifmmode\bar\else\textasciimacron\fi{}...
We have determined mW=79.91±0.39 GeV/c2 from an analysis of W→eν and W→μν data the Collider Detector at Fermilab in p¯p collisions a c.m. energy √s =1.8 TeV. This result, together with world-average Z mass, determines weak mixing angle to be sin2θW=0.232±0.008. Bounds on top-quark mass are discussed.Received 13 August 1990DOI:https://doi.org/10.1103/PhysRevLett.65.2243©1990 American Physical Society
The structure of turbulence near a free surface is examined by using results obtained from direct simulation flow between no-slip wall and shear boundary, which serves as model waveless surface. An energy balance analysis shows that the pressure-strain term dominant producing for spanwise component turbulent kinetic energy. In addition, dissipation rates horizontal components are reduced surface, whereas rate vertical remains approximately constant. Two-point correlations, spectra, length...
An analysis of pp\ifmmode\bar\else\textasciimacron\fi{} collision events at \ensuremath{\surd}s =1.8 TeV with jets and large missing transverse energy finds no event >40 GeV. This result yields a 90%-C.L. limit on the cross section for one-jet-event production <0.1 nb jet in pseudorapidity range \ensuremath{\Vert}\ensuremath{\eta}\ensuremath{\Vert}<1.0 ${E}_{T}$>52 Limits masses squarks gluinos minimal supersymmetry model are also set. At 90% C.L., ${m}_{q\ifmmode \tilde{}\else...
The magnetic moment of the ${\ensuremath{\Lambda}}^{0}$ hyperon has been measured to be ${\ensuremath{\mu}}_{\ensuremath{\Lambda}}=(\ensuremath{-}0.6138\ifmmode\pm\else\textpm\fi{}0.0047){\ensuremath{\mu}}_{N}$.
Empirical orthogonal function (EOF) analysis has been widely used in meteorology and oceanography to extract dominant modes of behavior scalar vector datasets. For two-dimensional fields, such as surface winds or currents, use the complex EOF method become widespread. In present paper, this is compared with a real-vector that apparently previously unused for current wind fields meteorology. It shown these two methods differ primarily respect concept optimal representation. Further, can...
The budgets of the Reynolds stress, turbulent kinetic energy and streamwise enstrophy are evaluated through direct numerical simulations for channel flow a viscoelastic polymer solution modeled with Finitely Extensible Nonlinear Elastic Peterlin approximation (FENE-P) constitutive equation. influence viscoelasticity on is examined comparison Newtonian obtained same constant pressure drop across channel. It observed that as extensional viscosity increases there consistent decrease in...
A search for tt\ifmmode\bar\else\textasciimacron\fi{}\ensuremath{\rightarrow}e\ensuremath{\mu}+X in pp\ifmmode\bar\else\textasciimacron\fi{} collisions at s\ensuremath{\surd}\ifmmode\bar\else\textasciimacron\fi{} TeV is described. The production and decay of top-quark--antiquark pairs considered the context standard model. analysis based on data with an integrated luminosity 4.4 ${\mathrm{pb}}^{\mathrm{\ensuremath{-}}1}$ recorded Collider Detector Fermilab. An upper limit...
We have determined mW=79.91±0.39 GeV/c2 from an analysis of W→eν and W→μν data the Collider Detector at Fermilab in ¯pp collisions √s=1.8 TeV. From this result world-average Z mass, weak mixing angle is to be sin2θW=0.232±0.008. An upper bound on top-quark mass derived discussed.Received 13 August 1990DOI:https://doi.org/10.1103/PhysRevD.43.2070©1991 American Physical Society
A neutral beam designed to transmit a high flux of ${\ensuremath{\Lambda}}^{0}$ hyperons with momenta above 50 GeV/c has been built and operated at Fermilab. Inclusive production cross sections per target nucleus have measured for $p+A\ensuremath{\rightarrow}{\ensuremath{\Lambda}}^{0}+X$, $p+A\ensuremath{\rightarrow}{K}_{S}^{0}+X$, $p+A\ensuremath{\rightarrow}{\overline{\ensuremath{\Lambda}}}^{0}+X$ 300-GeV protons incident on solid targets...
An analysis of ${Z}^{0}$\ensuremath{\rightarrow}${e}^{+}$${e}^{\mathrm{\ensuremath{-}}}$ and ${Z}^{0}$\ensuremath{\rightarrow}${\ensuremath{\mu}}^{+}$${\ensuremath{\mu}}^{\mathrm{\ensuremath{-}}}$ data from the Collider Detector at Fermilab in p\ifmmode\bar\else\textasciimacron\fi{}p collisions \ensuremath{\surd}s =1.8 TeV yields a mass ${Z}^{0}$ boson ${M}_{Z}$=90.9\ifmmode\pm\else\textpm\fi{}0.3 (stat+syst)\ifmmode\pm\else\textpm\fi{}0.2 (scale) GeV/${c}^{2}$ width...
Direct numerical simulations of fully developed turbulence in an open channel geometry were performed which a passive scalar was introduced. The intended to explore transport at free surfaces two cases for (1) the surface maintained constant temperature and (2) interfacial flux fixed. These can be considered models mass evaporative heat where buoyancy deformation effects are negligible. Significant differences found thermal fields these cases. turbulent statistics reveal that case...