1,122 research outputs found
Vibrational microspectroscopic characterisation of sailcloth: monitoring the deterioration of historic marine textiles
No full textGrid Metadata Lifetime Control in ActOn
No full textIn the Semantic Grid, metadata, as first class citizens, should be maintained up to-date in a cost-effective manner. This includes maxi missing the automation of different aspects of the metadata lifecycle, managing the evolution and change of metadata in distributed contexts, and synchronizing adequately the evolution of all these related entities. In this paper, we introduce a semantic model and its operations which is designed for supporting dynamic metadata management in Active Ontology (Act On), a semantic information integration approach for highly dynamic information sources. Finally, we illustrate the Act On-based metadata lifetime control by EGEE examples
SADE: The starspot and dynamo explorer
No full textWe propose a mission called SADE, the Starspot And Dynamo Explorer, to study dynamo activity in nearby late-type stars. The onboard instruments will be a Ca-K telescope for magnetically dominated chromospheric emission, and an X-ray grazing incidence telescope to study coronal emission. We design the mission for a life-time of 15 years or longer to capture a full activity cycle for most solar-type stars. We aim to firmly establish the spectrum of the relation between chromospheric and coronal emission in late-type stars, and capture one or more stars going into or coming out of a Maunder type minimum. Operation costs will be kept to a minimum by automating mission operations to a maximum, and have the science operations be carried out by students at Montana State University. © 2003 COSPAR. Published by Elsevier Ltd. All rights reserved
Regulation of mammalian spinal locomotor networks by glial cells
No full textNetworks of interneurons within the spinal cord coordinate the rhythmic activation of muscles during locomotion. These networks are subject to extensive neuromodulation, ensuring appropriate behavioural output. Astrocytes are proposed to detect neuronal activity via Gαq-linked G-protein coupled receptors and to secrete neuromodulators in response. However, there is currently a paucity of evidence that astrocytic information processing of this kind is important in behaviour. Here, it is shown that protease-activated receptor-1 (PAR1), a Gαq-linked receptor, is preferentially expressed by glia in the spinal cords of postnatal mice. During ongoing locomotor-related network activity in isolated spinal cords, PAR1 activation stimulates release of adenosine triphosphate (ATP), which is hydrolysed to adenosine extracellularly. Adenosine then activates A1 receptors to reduce the frequency of locomotor-related bursting recorded from ventral roots. This entails inhibition of D1 dopamine receptors, activation of which enhances burst frequency. The effect of A1 blockade scales with network activity, consistent with activity-dependent production of adenosine by glia. Astrocytes also regulate activity by controlling the availability of D-serine or glycine, both of which act as co-agonists of glutamate at N-methyl-D-aspartate receptors (NMDARs). The importance of NMDAR regulation for locomotor-related activity is demonstrated by blockade of NMDARs, which reduces burst frequency and amplitude. Bath-applied D-serine increases the frequency of locomotor-related bursting but not intense synchronous bursting produced by blockade of inhibitory transmission, implying activity-dependent regulation of co-agonist availability. Depletion of endogenous D-serine increases the frequency of locomotor-related but not synchronous bursting, indicating that D-serine is required at a subset of NMDARs expressed by inhibitory interneurons. Blockade of the astrocytic glycine transporter GlyT1 increases the frequency of locomotor-related activity, but application of glycine has no effect, indicating that GlyT1 regulates glycine at excitatory synapses. These results indicate that glia play an important role in regulating the output of spinal locomotor networks
Essays on freedom and power / by John Emerich Edward Dalberg-Acton ; selected, and with a new introduction by Gertrude Himmelfarb ; preface by Herman Finer
No full textIncludes bibliographical references (p. 374-398) and indexGUL copy owned by Charles E. Wyzanski, Jr. (1906-1986), U.S. District Judge (D. Mass) (1941-1986); GUL copy annotated by Judge Wyzansk
P-wave velocity (PWS split-core system) on ODP Hole 172-1062B
No full textP-wave velocity (PWS split-core system) on ODP Hole 172-1063
P-wave velocity (PWS split-core system) on ODP Hole 172-1056B
No full textP-wave velocity (PWS split-core system) on ODP Hole 172-1056
P-wave velocity (PWL whole-core system) on ODP Hole 172-1054C
No full textP-wave velocity (PWL whole-core system) on ODP Hole 172-1059
P-wave velocity (PWL whole-core system) on ODP Hole 200-1224C
No full textP-wave velocity (PWL whole-core system) on ODP Hole 200-1224
P-wave velocity (PWL whole-core system) on ODP Hole 186-1151D
No full textP-wave velocity (PWL whole-core system) on ODP Hole 186-1151
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