84,561 research outputs found
Discovery of an Isolated Population of \u3ci\u3eAnax Longipes\u3c/i\u3e in Michigan (Odonata: Aeshnidae)
Anax longipes is a large aeshnid dragonfly previously unknown from Michigan. Adults and larvae were found in abundance at a series of experimental ponds within the E.S. George Reserve in Livingston County, Michigan
Improving Extractions of |Vcb| and the b Quark Mass from Semileptonic Inclusive B Decay
Recent advances in improving extractions of |Vcb| and m_b from spectra of
semileptonic inclusive B decay are reported. Results of a general moment
analysis of the lepton energy spectrum and the hadronic invariant mass spectrum
are summarized. The calculation of the general O(\alpha_s) structure functions
for semileptonic B decay is reported, which has allowed the calculation of the
O(\alpha_s Lambda_{QCD} /m_b) terms for the hadronic invariant mass moments to
be carried out. Recent theoretical advances and improvements in experimental
data has allowed extractions of the CKM element |Vcb| to improve to the 2%
level.Comment: 8 pages, 2 figures. Talk given at MRST2004, May 12-14, Concordia,
Montrea
Temporalising OWL 2 QL
We design a temporal description logic, TQL, that extends the standard ontology language OWL2QL, provides basic means for temporal conceptual modelling and ensures first-order rewritability of conjunctive queries for suitably defined data instances with validity time
- …