9,315 research outputs found
[Book Review of] \u3cem\u3eLife and Death with Liberty and Justice\u3c/em\u3e, by Germain Grisez and Joseph M. Boyle, Jr.
Photoconductivity of high voltage space insulating materials: Measurements with metal electrodes
The electrical conductivities of high voltage insulating materials were measured in the dark and under various intensities of illumination. The materials investigated included FEP Teflon, Kapton-H, fused quartz, and parylene. Conductivities were determined as functions of temperature between 22 and 100 C and light intensity between 0 and 2.5 kW/m2. The thickness dependence of the conductivity was determined for Teflon and Kapton, and the influence of spectral wavelengths on the conductivity was determined in several cases. All measurements were made in a vacuum to simulate a space environment, and all samples had metallic electrodes. The conductivity of Kapton was permanently increased by exposure to light; changes as great as five orders of magnitude were observed after six hours of illumination
The health status of Irish honeybee colonies in 2006
peer-reviewedThis study assessed the health status of Irish honeybee colonies and provides a snapshot of the incidence of a number of important colony parasites/pathogens including: the mite Varroa destructor; three associated viruses (deformed wing virus (DWV), acute bee paralysis virus (ABPV) and Kashmir virus (KBV)); the tracheal mite Acarapis woodi; the microsporidian Nosema spp., and the insect Braula coeca. During June/July 2006, 135 samples of adult bees were collected from productive colonies throughout Ireland and standard techniques were used to determine the presence and absence of the parasites and pathogens. Varroa destructor was positively identified in 72.6% of the samples and was widely distributed. Although the samples were analysed for three viruses, DWV, ABPV and KBV, only DWV was detected (frequency = 12.5%). Acarapis woodi and Nosema spp. occurred in approximately 11% and 22% of the samples, respectively, while B. coeca, a wingless dipteran that was once common in Irish honeybee colonies, was very rare (3.7%). Samples where all the pathogens/parasites were jointly
absent were statistically under-represented in Leinster and DWV was statistically
over-represented in Munster. In Ulster, there was over-representation of the categories where all parasites/pathogens were jointly absent and for A. woodi, and underrepresentation of V. destructor.The project was funded by EU FEOGA
and the National Apiculture Programme 2007–2010
of the Department of Agriculture, Food and the
Marine
Tellier, Luc-Normand, éd. (1997) Les défis et les options de la relance de Montréal. Ste-Foy, Presses de l’Université du Québec (Coll. « Science régionale »), 191 p. (ISBN 2-7605-0958-3)
Paulet, Jean-Pierre, et al. (2000) Les très grandes villes dans le monde. Paris, CNED/SEDES, 240 p. (ISBN 2-7181-9335-0)
Pumain, Denise et Saint-Julien, Thérèse (1997) L’analyse spatiale. Localisation dans l’espace. Paris, Arman Colin (Coll. « Géographie »), 167 p. (ISBN 2-200-01897-5)
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