194 research outputs found
ArgoNeuT, a liquid argon time projection chamber in a low energy neutrino beam
ArgoNeuT (Argon Neutrino Test), a NSF/DOE project at Fermilab, is the first
LArTPC to go in a low energy neutrino beam and just the second LArTPC to go in
a neutrino beam ever. ArgoNeuT sits just upstream of the on-axis MINOS near
detector in the NuMI beamline, about 1 km from the target station and 100 m
underground. The detector features a 47X40X90 cm (169 L) active volume TPC with
a fully contained recirculation and purification system. Among other physics,
ArgoNeuT will measure the charged-current quasi-elastic (anti-) neutrino cross
section on argon at an energy of ~3 GeV.Comment: 3 pages, 2 figures, to appear in the proceedings of the 11th
International Conference on Topics in Astroparticle and Underground Physics
(TAUP 2009), Rome, Italy, 1-5 July 200
Hypertiling -- a high performance Python library for the generation and visualization of hyperbolic lattices
Hypertiling is a high-performance Python library for the generation and
visualization of regular hyperbolic lattices embedded in the Poincar\'e disk
model. Using highly optimized, efficient algorithms, hyperbolic tilings with
millions of vertices can be created in a matter of minutes on a single
workstation computer. Facilities including computation of adjacent vertices,
dynamic lattice manipulation, refinements, as well as powerful plotting and
animation capabilities are provided to support advanced uses of hyperbolic
graphs. In this manuscript, we present a comprehensive exploration of the
package, encompassing its mathematical foundations, usage examples,
applications, and a detailed description of its implementation.Comment: 52 pages, 20 figure
Room temperature organic exciton-polariton condensate in a lattice
Funding: The WuÌrzburg group acknowledges financial support from the state of Bavaria. We also thank the WuÌrzburgâDresden Cluster of Excellence ct.qmat for financial support.Interacting Bosons in artificial lattices have emerged as a modern platform to explore collective manybody phenomena and exotic phases of matter as well as to enable advanced on-chip simulators. On chip, excitonâpolaritons emerged as a promising system to implement and study bosonic non-linear systems in lattices, demanding cryogenic temperatures. We discuss an experiment conducted on a polaritonic lattice at ambient conditions: We utilize fluorescent proteins providing ultra-stable Frenkel excitons. Their soft nature allows for mechanically shaping them in the photonic lattice. We demonstrate controlled loading of the coherent condensate in distinct orbital lattice modes of different symmetries. Finally, we explore the self-localization of the condensate in a gap-state, driven by the interplay of effective interaction and negative effective mass in our lattice. We believe that this work establishes organic polaritons as a serious contender to the well-established GaAs platform for a wide range of applications relying on coherent Bosons in lattices.Publisher PDFPeer reviewe
Three-dimensional photonic confinement in imprinted liquid crystalline pillar microcavities
Sv.H. acknowledges financial support by the EPSRC âHybrid Polaritonicsâ Grant (EP/M025330/1). F.W. thanks the Deutsche Forschungsgemeinschaft (DFG) for financial support (WU317/18-1).We demonstrate the feasibility of a thermal imprint technology capable of structuring organic thin films with liquid crystalline properties forming feature sizes on a several micrometer scale. The imprint technique can directly be applied onto a variety of substrates including dielectric mirrors. The so fabricated three-dimensional microcavities have lateral extensions up to 20 ”m and heights between 1 and 5 ”m. Exemplarily, pillar microcavities were produced wherein three-dimensional photonic confinement is observed by the formation of 0D cavity mode patterns. The imprint technique further favors the formation of hemispherical pillar geometries rather than cylindrical pillars resulting in equidistant mode spacings of transversal cavity modes.PostprintPeer reviewe
Diarrheagenic enteroaggregative Escherichia coli causing urinary tract infection and bacteremia leading to sepsis
We report a case of a 55-year-old immunocompromised female who presented to the emergency department with severe diarrhea and vomiting following travel to the Philippines. Stool bacteriology revealed a mixed infection involving an enteropathogenic Escherichia coli and two distinct strains of enteroaggregative Escherichia coli (EAEC). During hospitalization, urine and blood culture tested positive for one of the diarrheagenic EAEC strains, necessitating urinary catheterization, intensive care, and antimicrobial treatment with trimethoprim-sulfamethoxazole, followed by meropenem. Although known to occasionally cause urinary tract infections, EAEC have not been previously associated with sepsis. Our report highlights the potential of EAEC to cause severe extraintestinal infections
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