58 research outputs found
Z' Decays into Four Fermions
If a new is discovered with a mass at LHC/SSC, its (rare)
decays into two charged leptons plus missing transverse energy will probe the
coupling to the lepton doublet and to , allowing
further discrimination among extended electroweak models.Comment: 9 pages plus 1 figure (not included but available), UG-FT-22/9
Top-Quark Decay Via the Anomalous Coupling at Hadron Colliders
We determine the constraints on the anomalous top-quark coupling associated
with the flavor-changing neutral current vertex from the
limits on the -quark rare decay and non-standard
top-quark decays. Based on these constraints, we discuss the experimental
observability of the rare decay mode , both at the
Fermilab Tevatron with a luminosity-upgrade and at the LHC.Comment: 19 pages, 8 figures, RevTeX, postscript files available via anonymous
ftp: ftp://ucdhep.ucdavis.edu/han/top/ (get paper_top.ps and fig*.ps
Sea level changes during the last and present interglacials in Sal Island (Cape Verde archipelago)
Last interglacial and Holocene deposits are particularly well developed in the southern parts of Sal Island (Cape
Verde Archipelago). They primarily consist of low-elevation (≤2 m above sea level [a.s.l.]) marine deposits
made of a basal conglomerate embedded in carbonate mud, passing upwards to calcarenites. All deposits
contain an abundant fauna with corals, algae and molluscs with Strombus latus Gmelin and accompanying
warm water species of the “Senegalese” fauna. Small scale geomorphological mapping with detailed
morphosedimentary analysis revealed lateral facies changes and imbricate (offlapping) structures that suggest
small-scale oscillations of paleo-sealevels during high sea stand intervals. U-series measurements (in coral
fragments) allowed unequivocal identification of Marine Isotope Substage (MIS) 5.5 units, but were not
precise enough to date the sea level oscillations of the interval. However, geomorphological data and
sedimentary facies analysis suggest a double sea level highstand during the peak of the last interglacial.
MIS 5.5 age deposits occur at Sal and the Canary Islands at low topographic elevations, between 1 and 2 masl.
However, these values are lower than the elevations measured for the correlative terraces outcropping at the
western tropical Atlantic islands, widely considered to be tectonically stable.
Combining the results in this paper with earlier investigations of the “Senegalese” fauna distribution as far
north as the Mediterranean basin, it is suggested that the last-interglacial oceanic temperatures in this basin, as
well as the temperatures in other islands of the Eastern Atlantic and the coasts of Morocco, were warmer than
modern temperatures
Sea level and climate changes during OIS 5e in the Western Mediterranean
Palaeontological, geomorphological and sedimentological data supported by isotopic dating on Oxygen
Isotopic Stage (OIS) 5e deposits from the Spanish Mediterranean coast, are interpreted with the aim of
reconstructing climatic instability in the Northern Hemisphere. Data point to marked climatic instability
during the Last Interglacial (OIS 5e), with a change in meteorological conditions and, consequently, in the
sedimentary environment. The oolitic facies generated during the first part of OIS 5e (ca. 135 kyr) shift into
reddish conglomeratic facies during the second part (ca. 117 kyr). Sea surface Temperature (SST) and salinity
are interpreted mainly on the basis of warm Senegalese fauna, which show chronological and spatial
differential distribution throughout the Western Mediterranean. Present hydrological and meteorological
conditions are used also as modern analogues to reconstruct climatic variability throughout the Last
Interglacial, and this variability is interpreted within the wider framework of the North Atlantic record. All
the available data indicate an increase in storminess induced by an increase in the influence of northwesterlies,
a slight drop of SST in the northern Western Mediterranean, and an important change in
meteorological conditions at the end of OIS 5e (117 kyr). These changes correlate well with the decrease in
summer insolation and with the climatic instability recorded in North Atlantic high latitudes
Impact of castor meal on root-knot and free-living nematodes
Soil amendment may enhance soil quality as well as reduce plant-parasitic nematode. Despite the many applications already undertaken using castor meal, its efficiency in controlling root-knot nematodes (RKN, Meloidogyne incognita) when applied to melon (Cucumis melo) is still not clear. Three different amounts of castor meal (Ricinus communis) applied were evaluated in microplots planted with melon either with or without RKN. The impact of castor meal on soil free-living nematode communities was also determined. Total nematode genera richness was estimated as 37 for the entire set of microplots sampled across both sampling dates. Rarefaction analysis resulted in 12 collector's curves out of the total of 30 that reached the horizontal asymptote. Univariate ANOVA with two factors yielded differences (p < 0.05) only with regard to the time factor. Simpson, Shannon, Evenness and Equitability indices showed a trend toward moderate increases by the end of the experiment, while the other indices were higher for tomato in pre-transplant sampling compared to harvest. Nematode community and diversity changed during the course of the experiment, although there was substantial confounding heterogeneity within and between the factorial combinations from the beginning. Root knot population was not reduced by the castor meal but increased throughout the period, regardless of treatment. RKN reduced melon yield, number and weight of melon
Becoming natural An exploration of the naturalisation of marriage
Available from British Library Document Supply Centre-DSC:DXN032688 / BLDSC - British Library Document Supply CentreSIGLEGBUnited Kingdo
Quaternary marine terraces on Sal Island (Cape Verde archipelago)
The Quaternary sedimentary record of Sal Island includes marine and related aeolian and alluvial fan deposits. The substratum of the
island is volcanic, with ages between 25 and 0.6 Ma. Quaternary marine units generally occur as raised marine terraces forming a broad
staircase between elevations of 55–60m and present sea level. Terraces include a basal conglomerate overlaid by calcarenite; both host
corals, algae and molluscs.
A chronostratigraphic framework for the Middle Pleistocene to Holocene units has been generated based on a geomorphologic map of
the Quaternary landforms and associated deposits and morphosedimentary analysis, with support of laboratory dating: U-series by
TIMS in corals, 14C analyses, palaeomagnetic measurements, and K/Ar ages from other literature. U-series dating of corals from marine
terraces provides benchmarks for the Last Interglacial (Oxygen Isotope Substage 5e) and Holocene deposits. The present elevation of the
marine terraces and their staircase arrangement suggest a change in vertical movement trend around 330 ka from an uplift to either
subsidence or stabilization
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