J. Hassard
A5067059383- Particle physics theoretical and experimental studies
- Quantum Chromodynamics and Particle Interactions
- High-Energy Particle Collisions Research
- Dark Matter and Cosmic Phenomena
- Particle Detector Development and Performance
- Neutrino Physics Research
- Diamond and Carbon-based Materials Research
- Atomic and Subatomic Physics Research
- Ion-surface interactions and analysis
- Superconducting Materials and Applications
- High-pressure geophysics and materials
- Microfluidic and Capillary Electrophoresis Applications
- Particle Accelerators and Free-Electron Lasers
- Air Quality Monitoring and Forecasting
- Data Management and Algorithms
- Distributed and Parallel Computing Systems
- Medical Imaging Techniques and Applications
- Nuclear Physics and Applications
- Microfluidic and Bio-sensing Technologies
- Mass Spectrometry Techniques and Applications
- Electrowetting and Microfluidic Technologies
- Computational Physics and Python Applications
- Energy Efficient Wireless Sensor Networks
- Black Holes and Theoretical Physics
- Earthquake Detection and Analysis
Imperial College London
1998-2022
University of Manchester
1980-2017
King's College Hospital
1995
The Ohio State University
1994
Harvard University Press
1982-1987
Carnegie Mellon University
1986
Rutgers, The State University of New Jersey
1982-1986
Cornell University
1983-1986
University at Albany, State University of New York
1986
Syracuse University
1985
The use of quantum dots can turn the old concept a luminescent solar collector into practical concentrator. efficiency, tunability absorption threshold, and size redshift make an ideal replacement for organic dyes whose performance limited this inexpensive technology. Progress in photovoltaic cells, particular, ability quantum-well cells to tune band gap, also suggests high efficiency is possible thermophotovoltaic applications. A thermodynamic model used show quantitatively how separation...
In this paper, we present a distributed infrastructure based on wireless sensors network and Grid computing technology for air pollution monitoring mining, which aims to develop low-cost ubiquitous sensor networks collect real-time, large scale comprehensive environmental data from road traffic emissions in urban environment. The main informatics challenges respect constructing the high-throughput are discussed paper. We twolayer framework, P2P e-Science architecture, mining algorithm as...
We have used the momentum spectrum of leptons produced in semileptonic $B$-meson decays to set a 90%-confidence-level upper limit on $\frac{\ensuremath{\Gamma}(b\ensuremath{\rightarrow}\mathrm{ul}\ensuremath{\nu})}{\ensuremath{\Gamma}(b\ensuremath{\rightarrow}\mathrm{cl}\ensuremath{\nu})}$ 4%. also measure branching fractions $B$ meson be (12.0\ifmmode\pm\else\textpm\fi{}0.7\ifmmode\pm\else\textpm\fi{}0.5)% for electrons and (10.8\ifmmode\pm\else\textpm\fi{}0.6\ifmmode\pm\else\textpm\fi{}1.0)% muons.
Measurements of the ${e}^{+}{e}^{\ensuremath{-}}$ cross section above $B\overline{B}$ threshold are reported. Structures observed which could be $\ensuremath{\Upsilon}(5S)$ and $\ensuremath{\Upsilon}(6S)$ resonances. The masses widths given compared with various potential-model predictions. Average charged multiplicities inclusive lepton yields also presented.
$B$-meson decays to final states consisting of a ${D}^{0}$ or ${D}^{*\ifmmode\pm\else\textpm\fi{}}$ and one two charged pions have been observed. The charged-$B$ mass is 5270.8 \ifmmode\pm\else\textpm\fi{} 2.3 2.0 MeV the neutral-$B$ 5274.2 1.9 MeV.
In this paper, we present a distributed infrastructure based on wireless sensors network and Grid computing technology for air pollution monitoring mining, which aims to develop low-cost ubiquitous sensor networks collect real-time, large scale comprehensive environmental data from road traffic emissions in urban environment. The main informatics challenges respect constructing the high-throughput are discussed paper. We twolayer framework, P2P e-Science architecture, mining algorithm as...
We report measurements of single-particle inclusive spectra and two-particle correlations in decays the \ensuremath{\Upsilon}(1S) resonance nonresonant annihilations electrons positrons at center-of-mass energy 10.49 GeV, just below BB\ifmmode\bar\else\textasciimacron\fi{} threshold. These data were obtained using CLEO detector Cornell Electron Storage Ring (CESR) provide information on production \ensuremath{\pi}, K, \ensuremath{\rho}, ${K}^{\mathrm{*}}$, \ensuremath{\varphi}, p,...
Evidence is presented for a narrow meson resonance of mass 1970\ifmmode\pm\else\textpm\fi{}5\ifmmode\pm\else\textpm\fi{}5 MeV produced in continuum ${e}^{+}{e}^{\ensuremath{-}}$ annihilations at $\sqrt{s}$ 10.5 GeV, and decaying into $\ensuremath{\phi}$ charged $\ensuremath{\pi}$.
We have searched for flavor-changing neutral-current weak decays of the $b$ quark and find ${R}_{B}(b\ensuremath{\rightarrow}{l}^{+}{l}^{\ensuremath{-}}X)<0.31%$ at 90% confidence level. This limit excludes models with in a left-handed isosinglet. also place limits on ratio ${B}^{\ifmmode\pm\else\textpm\fi{}}$ ${B}^{0}$ semileptonic branching fractions ${B}^{0}{\stackrel{-}{B}}^{0}$ mixing.
Limits are set on B0B¯0 mixing by use of dilepton events from Υ(4S) decay. On the assumption that charged- and neutral-B semileptonic branching ratios equal 41% B mesons neutral, a 90%-confidence-level upper limit 24% is mixing. also given for ratio lifetimes neutral charged mesons. The limits &<2.05.Received 24 July 1986DOI:https://doi.org/10.1103/PhysRevLett.58.183©1987 American Physical Society
A detailed investigation of the decay $\ensuremath{\Upsilon}(2S)\ensuremath{\rightarrow}{\ensuremath{\pi}}^{+}{\ensuremath{\pi}}^{\ensuremath{-}}\ensuremath{\Upsilon}(1S)$ has been made from 128 000 $\ensuremath{\Upsilon}(2S)$ decays observed in CLEO detector at Cornell Electron Storage Ring (CESR). We find this branching ratio to be (19.1\ifmmode\pm\else\textpm\fi{}1.2\ifmmode\pm\else\textpm\fi{}0.6)%. The properties $\ensuremath{\pi}\ensuremath{\pi}$ system have studied using 491 exclusive...
We have investigated the transitions \ensuremath{\Upsilon}(3S)\ensuremath{\rightarrow}${\ensuremath{\pi}}^{+}$${\ensuremath{\pi}}^{\mathrm{\ensuremath{-}}}$\ensuremath{\Upsilon}(1S) and \ensuremath{\Upsilon}(3S)\ensuremath{\rightarrow}${\ensuremath{\pi}}^{+}$${\ensuremath{\pi}}^{\mathrm{\ensuremath{-}}}$\ensuremath{\Upsilon}(2S) cascade process \ensuremath{\Upsilon}(3S)\ensuremath{\rightarrow}\ensuremath{\Upsilon}(2S)+X,...