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91.
Decisions about infant feeding are commonly viewed as an issue of personal choice made in the light of information about the benefits of breastfeeding. A pilot study of first-time parents' decisions and experiences in Newcastle upon Tyne, England, suggests that local cultural contexts, in particular how men and women are seen to be parenting in different spaces, have a profound influence on infant feeding. 相似文献
92.
Hydrogen sulfide in hydrothermal vent fluid at the 21°N site is enriched in 34S relative to Mid-Ocean Ridge basalts, probably by addition of H2S reduced from seawater sulfate by FeO-bearing basalt. Metalliferous sulfides are depleted in 34S relative to the fluid from which they apparently precipitated, the degree of depletion reflecting the microenvironment in which each mineral crystallised and/or kinetic effects. Isotopic compositions of coexisting sulfides in a basal mound are consistent with equilibration at around 445°C, though heating to such a high temperature seems unlikely. Similar sulfides in a black smoker and in a dead chimney are out of isotopic equilibrium at any temperature, apparently reflecting a complex series of replacement mineralisations and post-depositional oxidation, respectively. 相似文献
93.
Tertiary geodynamics of Sakhalin (NW Pacific) from anisotropy of magnetic susceptibility fabrics and paleomagnetic data 总被引:1,自引:0,他引:1
Richard Weaver Andrew P Roberts Rachel Flecker David I.M Macdonald 《Tectonophysics》2004,379(1-4):25-42
Sakhalin has been affected by several phases of Cretaceous and Tertiary deformation due to the complex interaction of plates in the northwest Pacific region. A detailed understanding of the strain is important because it will provide constraints on plate-scale processes that control the formation and deformation of marginal sedimentary basins. Anisotropy of magnetic susceptibility (AMS) data were obtained from fine-grained mudstones and siltstones from 22 localities in Sakhalin in order to provide information concerning tectonic strain. AMS data reliably record ancient strain tensor orientations before significant deformation of the sediments occurred. Paleomagnetically determined vertical-axis rotations of crustal rocks allow rotation of the fabrics back to their original orientation. Results from southwest Sakhalin indicate a N035°E-directed net tectonic transport from the mid-Paleocene to the early Miocene, which is consistent with the present-day relative motion between the Okhotsk Sea and Eurasian plates. Reconstruction of early–late Miocene AMS fabrics in east Sakhalin indicates a tectonic transport direction of N040°E. In west Sakhalin, the transport direction appears to have remained relatively consistent from the Oligocene to the late Miocene, but it has a different attitude of N080°E. This suggests local deflection of the stress and strain fields, which was probably associated with opening of the northern Tatar Strait. A northward-directed tectonic transport is observed in Miocene sediments in southeast Sakhalin, mid-Eocene sediments in east Sakhalin, and in Late Cretaceous rocks of west and northern Sakhalin, which may be associated with northwestward motion and subduction of the Pacific Plate in the Tertiary period. The boundaries of the separate regions defined by the AMS data are consistent with present-day plate models and, therefore, provide meaningful constraints on the tectonic evolution of Sakhalin. 相似文献
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95.
Robert a. Berner Ji-Long Rao Soobum Chang Rachel O'brien C. Kent Keller 《Aquatic Geochemistry》1998,4(2):273-290
Chemical analyses for major ions have been conducted on waters,collected on an approximately weekly basis over the period April, 1993 toNovember, 1996, that drain three small experimental ecosystems(sandboxes) at Hubbard Brook, New Hampshire. One sandbox is planted withpine trees, another with grass, and the third is left bare (actually itis covered sporadically by bryophytes and lichens). Results show linearcorrelations, independent of discharge, between the concentrations ofdissolved Na+ and K+ on the one hand andCa++ and Mg++ on the other for all threesandboxes. No correlations between singly charged and doubly chargedcations were found. These correlations are interpreted to represent cationexchange equilibria between soil waters and clay minerals plus soil organicmatter. The correlation slope, representing the exchange constant, for Na vsK is different for the pine-covered sandbox than for the other two whereasfor Ca vs Mg the correlation is independent of the presence or absence oftrees. We interpret this as representing a shift of cation exchangeequilibria in the pine sandbox by the activities of growing trees.Concentrations of Na, K, Ca, Mg, and H4SiO4from the barren and grass-lined sandboxes were found to vary seasonally witha marked sinusoidal pattern which was independent of the discharge from eachsandbox. (The discernment of a similar pattern in the tree lined sandbox wasdifficult due to a lack of discharge over much of the year.) Concentrationmaxima occurred in August and minima in February, and there is a closeparallelism with soil temperature. We interpret this as representingtemperature induced variations in cation exchange equilibria and silicaadsorption. Independence from highly varying water discharge, e.g.,. thataccompanying severe rainstorms, indicates rapidly re-attained equilibrium.Variations in the concentrations of cations are likely due to exchange withunmeasured cations, probably H+ or dissolved Al species, as aresult of possible seasonal changes in internal acid production and externalinput of acid rain to the sandboxes. Internal production may represent aresponse to seasonal changes in respiration rate as it responds toseasonally varying temperature. Added to this is the effect of temperatureon exchange equilibrium. Seasonal variations in dissolved silica are mostlikely due to the dependence of adsorption/desorption equilibria ontemperature. The temperature dependence of a number of silica-consumingreactions are consistent with the measured values. 相似文献
96.
RobertSchmidt Rachel L.Webster Geraint F.Lewis 《Monthly notices of the Royal Astronomical Society》1998,295(2):488-496
In the gravitational lens system Q2237+0305 the cruciform quasar image geometry is twisted by 10c by the lens effect of a bar in the lensing galaxy. This effect can be used to measure the mass of the bar. We construct a new lensing model for this system with a power-law elliptical bulge and a Ferrers bar. The observed ellipticity of the optical isophotes of the galaxy leads to a nearly isothermal elliptical profile for the bulge, with a total quasar magnification of 16+5 −4 . We measure a bar mass of (7.5 ∼ 1.5) −108 h −1 75 M⊙ in the region inside the quasar images. 相似文献
97.
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99.
Spatial patterns of ice storm disturbance on a forested landscape in the Appalachian Mountains, Virginia 总被引:3,自引:0,他引:3
Ice storms (major freezing rain events) periodically disturb forests in eastern North America. The damage may vary spatially, especially in complex terrain. This study uses satellite imagery to investigate spatial heterogeneity of forest damage caused by ice storms that affected the Appalachian Mountains, Virginia during 1994. The results display a region-scale (southwest-to-northeast) gradient in damage that apparently corresponds to a gradient in the depth of ice that accumulated during the storms. Damage also varied topographically, particularly by aspect. Damage was most extensive on east-, southeast- and south-facing slopes; at middle elevations; and on slopes of moderate steepness. 相似文献
100.
J. Stephen Fries Rachel T. Noble Hans W. Paerl Gregory W. Characklis 《Estuaries and Coasts》2007,30(2):359-364
Monitoring of estuarine condition depends on water quality parameters that have significant and interpretable ecological effects
and can be assessed either in situ or via rapid laboratory techniques. Two commonly measured parameters are water column turbidity
(NTU) and total suspended solids (TSS). Under certain conditions, either of these measures could represent a proxy for runoff
and provide rapid, in situ measures to improve protection of the public by decreasing the time required to detect and monitor
associated effects (e.g., reduced water clarity and eutrophication). The Neuse River Estuary (NRE) has experienced a decline
in water quality due to anthropogenic inputs, including stormwater containing nutrient and particle loads. Water samples were
collected from the NRE during both dry weather and storm events over 16 mo across the entire estuarine gradient. Particle
size distributions, ratio of particulate organic carbon to nitrogen, chlorophylla (chla), TSS, and NTU were measured in each of these samples, with the data separated into regions based on salinity and depth of
sample collection. Particle analyses were directed at identifying suspensions dominated by phytoplankton, runoff particles,
or resuspended sediments. Particle size distributions for suspensions in Region I (all samples with salinity less than 2)
varied little during sampling, resulting in a robust NTU-TSS relationship. This relationship confirmed the usefulness of turbidity
as a measure of runoff and resuspension of recently deposited runoff in the upper NRE. Phytoplankton cells represented a majority
of the particles in Region II (surface samples with salinity greater than 2), based on the close relationship between chla and total particle volume in these samples. Suspensions of large, nearly uniform diameter particles, which are likely aggregates
and resuspended sediment, were observed in Region III (bottom samples with salinity greater than 2). Using these techniques
as part of routine monitoring, particle suspension measures in different hydrographic regions of an estuary provide evidence
useful for identifying the source and water quality consequences of particle suspensions (e.g., microbial contamination and
algal blooms). 相似文献