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Search Results: 1 - 10 of 297527 matches for " J. Hadfield "
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Description of a new gnathiid, Afrignathia multicavea gen. et sp. n. (Crustacea: Isopoda: Gnathiidae), from South Africa
Kerry A. Hadfield,Nico J. Smit
African Zoology , 2011,
Abstract: A new genus and species of gnathiid isopod,Afrignathia multicavea gen. et sp. n., is described from material collected during the 1960s and 1970s in False Bay, offshore between Still Bay and Mossel Bay, and off Cape Point. This gnathiid does not conform to any other known species, having morphological characteristics not seen in the other 11 recognized genera. Features making the genus unique include a pylopod consisting of only one article, a mandible with two rows of unequal teeth on the blade and apex, and cephalosome appendages that could be maxillae 1 (maxillules), which are usually absent in all known male gnathiids. This species is also characterized by clusters of sensory pits scattered over the cephalosome and pereon
The EU and Strategic Culture: Virtual Identity Vs Uploaded Preferences
Amelia Hadfield
Journal of Contemporary European Research , 2005,
Abstract:
Fredholm modules over certain group C*-algebras
Tom Hadfield
Mathematics , 2001,
Abstract: Motivated by the search for new examples of "noncommutative manifolds", we study the noncommutative geometry of the group C*-algebras of various discrete groups. The examples we consier are the infinite dihedral group ${\bf Z} \times_{\sigma} {\bf Z}_2$ and the semidirect product ${\bf Z} \times_{\sigma} {\bf Z}$. We present a unified treatment of the K-homology and cyclic cohomology of these algebras.
Twisted cyclic homology of all Podles quantum spheres
Tom Hadfield
Mathematics , 2004, DOI: 10.1016/j.geomphys.2006.03.006
Abstract: We calculate the twisted Hochschild and cyclic homology (in the sense of Kustermans, Murphy and Tuset) of all Podles quantum spheres relative to arbitary automorphisms. Our calculations are based on a free resolution due to Masuda, Nakagami and Watanabe. The dimension drop in Hochschild homology can be overcome by twisting by automorphisms induced from the canonical modular automorphism associated to the Haar state on quantum SU(2). We specialize our results to the standard quantum sphere, and identify the class in twisted cyclic cohomology of the 2-cocycle discovered by Schmuedgen and Wagner corresponding to the distinguished covariant differential calculus found by Podles.
K-homology of the CAR algebra
Tom Hadfield
Mathematics , 2001,
Abstract: We compare the K-theory and K-homology of the well known CAR algebra. While the $K_0$ group is infinitely generated, we shows that it pairs identically to zero with even Fredholm modules over the algebra. We show further that in fact the even K-homology is trivial, while the odd K-homology is very large. These results give some insight into the K-homology of AF-algebras.
K-homology of the rotation algebras $A_θ$
Tom Hadfield
Mathematics , 2001,
Abstract: We study the K-homology of the rotation algebras $A_{\theta}$ using the six term cyclic sequence for the K-homology of a crossed product by ${\bf Z}$. In the case where $\theta$ is irrational we use Pimsner and Voiculescu's work on AF-embeddings of the $A_{\theta}$ to search for the missing generator of the even K-homology.
Twisted cyclic cohomology of the quantum SU(2)
Tom Hadfield
Mathematics , 2004,
Abstract: Withdrawn. Generalized and subsumed by math.QA/0405249
K-homology of certain group C*-algebras
Tom Hadfield
Mathematics , 2002,
Abstract: Motivated by the search for new examples of ``noncommutative manifolds'', we study the noncommutative geometry (in the sense of Connes) of the group C*-algebras of various discrete groups. The examples we consider are the infinite dihedral group Z \times_{\sigma} $Z_2$ and the semidirect product group $Z \times_{\sigma} Z$. We present a unified treatment of the K-homology and cyclic cohomology of these algebras.
The noncommutative geometry of the discrete Heisenberg group
Tom Hadfield
Mathematics , 2002,
Abstract: Motivated by the search for new examples of ``noncommutative manifolds'', we study the noncommutative geometry (in the sense of Connes) of the group C*-algebra of the three dimensional discrete Heisenberg group. We present a unified treatment of the K-homology, cyclic cohomology and derivations of this algebra.
A prevalence survey of every-day activities in pregnancy
Samantha J Lain, Jane B Ford, Ruth M Hadfield, Christine L Roberts
BMC Pregnancy and Childbirth , 2010, DOI: 10.1186/1471-2393-10-41
Abstract: The study was conducted in the antenatal clinic of a teaching hospital with tertiary obstetric and neonatal care in Sydney, Australia between August 2008 and April 2009. Women who were at least 20 weeks pregnant and able to read English completed a questionnaire to assess whether they had performed a list of activities in the seven days prior to survey completion. Results were analysed using frequency tabulations, contingency table analyses and chi square tests.A total of 766 surveys were completed, 29 surveys were excluded as the women completing them were less than 20 weeks pregnant, while 161 women completed the survey more than once. Ninety seven per cent of women completed the survey when approached for the first time, while 87% completed the survey when approached a subsequent time. In the week prior to completing the survey 82.6% of women had consumed a caffeinated beverage, 42.1% had had sexual intercourse, 32.7% had lifted something over 12 kilograms, 21.4% had consumed alcohol and 6.4% had performed vigorous exercise. The weekly prevalence of heavy lifting was higher for multiparous women compared to nulliparous women.The results of this study can be used to inform future research into activities as acute triggers of pregnancy complications.Women have many concerns about the safety of performing otherwise everyday activities during pregnancy. Pregnant women seek information about air travel, sexual intercourse and exercise during pregnancy[1], while antenatal care providers may also need to confirm or refute pregnancy 'old wives' tales', such as eating spicy food to induce labour[2]. However research into the effects of these and other common activities during pregnancy is sparse and often contradictory[3-10].To perform high quality research into the effects of these activities in pregnant women, each study needs a sample size large enough to demonstrate differences between groups of women. To calculate the sample size for a case-control or case-crossover
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