406 research outputs found
Reciclagem em inseminação artificial de bovinos.
bitstream/CPACT-2009-09/12053/1/documento_246.pd
The behaviour of political parties and MPs in the parliaments of the Weimar Republic
Copyright @ 2012 The Authors. This is the author's accepted manuscript. The final published article is available from the link below.Analysing the roll-call votes of the MPs of the Weimar Republic we find: (1) that party competition in the Weimar parliaments can be structured along two dimensions: an economic left–right and a pro-/anti-democratic. Remarkably, this is stable throughout the entire lifespan of the Republic and not just in the later years and despite the varying content of votes across the lifespan of the Republic, and (2) that nearly all parties were troubled by intra-party divisions, though, in particular, the national socialists and communists became homogeneous in the final years of the Republic.Zukunftskolleg, University of Konstan
The Stability of Bredigite and Other Ca-Mg Silicates
Peer Reviewedhttp://deepblue.lib.umich.edu/bitstream/2027.42/65844/1/j.1151-2916.1980.tb10213.x.pd
Predictors of invertebrate biomass and rate of advancement of invertebrate phenology across eight sites in the North American Arctic
Average annual temperatures in the Arctic increased by 2–3 °C during the second half of the twentieth century. Because
shorebirds initiate northward migration to Arctic nesting sites based on cues at distant wintering grounds, climate-driven
changes in the phenology of Arctic invertebrates may lead to a mismatch between the nutritional demands of shorebirds
and the invertebrate prey essential for egg formation and subsequent chick survival. To explore the environmental drivers
afecting invertebrate availability, we modeled the biomass of invertebrates captured in modifed Malaise-pitfall traps over
three summers at eight Arctic Shorebird Demographics Network sites as a function of accumulated degree-days and other
weather variables. To assess climate-driven changes in invertebrate phenology, we used data from the nearest long-term
weather stations to hindcast invertebrate availability over 63 summers, 1950–2012. Our results confrmed the importance
of both accumulated and daily temperatures as predictors of invertebrate availability while also showing that wind speed
negatively afected invertebrate availability at the majority of sites. Additionally, our results suggest that seasonal prey avail ability for Arctic shorebirds is occurring earlier and that the potential for trophic mismatch is greatest at the northernmost
sites, where hindcast invertebrate phenology advanced by approximately 1–2.5 days per decade. Phenological mismatch
could have long-term population-level efects on shorebird species that are unable to adjust their breeding schedules to the
increasingly earlier invertebrate phenologies.publishedVersio
Medidas de biosseguridade no uso da inseminação artificial em bovinos.
O que são medidas de biosseguridade? Quais são os pontos críticos no uso da IA? Como a IA pode contribuir para disseminação de patógenos?bitstream/item/223082/1/COMUNICADO-TECNICO-382.pd
Polarized light-flavor antiquarks from Drell-Yan processes of h+\vec{N}\to\vec{l^{+-}} + l^{-+} + X
We propose a formula to determine the first moment of difference between the
polarized - and -quarks in the nucleon, {\it i.e.} from the Drell-Yan processes in collisions of unpolarized
hadrons with longitudinally polarized nucleons by measuring outgoing lepton
helicities. As coefficients in the differential cross section depend on the
- and -quark numbers in the unpolarized hadron beam, the difference
can be independently tested by changing the hadron
beam. Moreover, a formula for estimating the -factor in Drell-Yan processes
is also suggested.Comment: 10 pages, 1 figur
Drell-Yan forward-backward and spin asymmetries for arbitrary vector boson production at next-to-leading order
Longitudinally polarized, unpolarized and forward-backward mass differential
cross sections for Drell-Yan lepton-pair production by arbitrary vector bosons
are calculated in next-to-leading order (NLO) QCD. Analytical results are
presented in a form valid for all consistent -dimensional regularization
schemes, with the mass factorization scheme kept general. NLO predictions for
all Drell-Yan type processes (, and ) at BNL's
relativistic heavy ion collider (RHIC) are made using polarized parton
distributions which fit the recent deep-inelastic scattering data. These are
examined as tools in the determination of the polarized parton distributions
and the unpolarized ratio. NLO predictions for the
forward-backward lepton asymmetry at Fermilab are made and the precision
determination of from future runs is studied. In all the
above, the QCD corrections are found to be significant. An introductory
discussion is given of various theoretical issues, such as allowable
factorization and regularization schemes, and scale dependences.Comment: 34 pages, figures included, revtex. Some discussions and references
added/modified. In more compact form. To appear in Phys. Rev.
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