794 research outputs found
An investigation of term weighting approaches for microblog retrieval
The use of effective term frequency weighting and document length normalisation strategies have been shown over a number of decades to have a significant positive effect for document retrieval. When dealing with much shorter documents, such as those obtained from microblogs, it would seem intuitive that these would have less benefit. In this paper we investigate their effect on microblog retrieval performance using the Tweets2011 collection from the TREC 2011 Microblog Track
CLARITY at the TREC 2011 microblog track
For the first year of the TREC Microblog Track the CLARITY group concentrated on a number of areas, investigating the underlying term weighting scheme for ranking tweets, incorporating query expansion to introduce new terms into the query, as well as introducing an element of temporal re-weighting based on the temporal distribution of assumed relevant microblogs
A model for standardizing manipulation terminology in physical therapy practice
Research supporting the efficacy of manual therapy, manipulation in particular, is growing. The ability to communicate clearly and accurately regarding this important intervention, regardless of region or background, is essential if clinicians are to incorporate this research in clinical practice. In February 2007, the American Academy of Orthopaedic Manual Physical Therapists formed a task force to standardize manual therapy terminology, starting with the intervention of manipulation. The ultimate goal of this task force was to create a template that has the potential to be used internationally by the community of physical therapists in order to standardize manual therapy nomenclature. The following document reflects the work and recommendations of this task force
Fast switching tunable laser sources for wavelength division multiplexing in passive optical access networks
Tunable laser structures with nanosecond switching time between wavelength channels and low-power injection locking are demonstrated on a low-cost platform. These lasers are suitable as source or slave lasers in WDM passive optical access networks
A novel two-section tunable discrete mode Fabry-PÉrot laser exhibiting nanosecond wavelength switching
A novel widely tunable laser diode is proposed and demonstrated. Mode selection occurs by etching perturbing slots into the laser ridge. A two-section device is realized with different slot patterns in each section allowing Vernier tuning. The laser operates at 1.3 mum and achieves a maximum output power of 10 mW. A discontinuous tuning range of 30 nm was achieved with a side mode suppression greater than 30 dB. Wavelength switching times of approximately 1.5 ns between a number of wavelength channels separated by 7 nm have been demonstrated
Neutron scattering Measurements of the phonon density of states of FeSe superconductors
Inelastic neutron-scattering experiments have been carried out on
polycrystalline samples of the FeSe superconductors. We report the
phonon density of states for FeSe with Tc8 K. The phonon
cutoff frequency is observed around 40 meV. No significant change is observed
across the superconducting transition. The measurements support the published
first-principles calculations [A. Subedi et al., Phys. Rev. B \textbf{78},
134514 (2008)].Comment: new version with change
- …