129 research outputs found
Lucano poeta, y historiador antiguo : en que se tratan las guerras Pharsalicas, que tuuieron Iulio Cesar y Pompeyo
Copia digital. Madrid : Ministerio de Educación, Cultura y Deporte. Subdirección General de Coordinación Bibliotecaria, 2013Marca tip. en port.[calderón]8, A-Z8, 2A-2B8Apostillas marginale
Exclusive photoproduction of pi degrees up to large values of Mandelstam variables s, t, and u with CLAS
Exclusive photoproduction cross sections have been measured for the process
with the Dalitz decay final state
using tagged photon energies in the range of GeV.
The complete angular distribution of the final state , for the entire
photon energy range up to large values of and , has been measured for
the first time. The data obtained show that the cross section , at
mid to large angles, decreases with energy as . This is in
agreement with the perturbative QCD quark counting rule prediction of . Paradoxically, the size of angular distribution of measured cross sections
is greatly underestimated by the QCD based Generalized Parton Distribution
mechanism at highest available invariant energy GeV. At the same
time, the Regge exchange based models for photoproduction are more
consistent with experimental data.Comment: 7 pages, 6 figure
Elliptic flow of charged particles in Pb-Pb collisions at 2.76 TeV
We report the first measurement of charged particle elliptic flow in Pb-Pb
collisions at 2.76 TeV with the ALICE detector at the CERN Large Hadron
Collider. The measurement is performed in the central pseudorapidity region
(||<0.8) and transverse momentum range 0.2< < 5.0 GeV/. The
elliptic flow signal v, measured using the 4-particle correlation method,
averaged over transverse momentum and pseudorapidity is 0.087 0.002
(stat) 0.004 (syst) in the 40-50% centrality class. The differential
elliptic flow v reaches a maximum of 0.2 near = 3
GeV/. Compared to RHIC Au-Au collisions at 200 GeV, the elliptic flow
increases by about 30%. Some hydrodynamic model predictions which include
viscous corrections are in agreement with the observed increase.Comment: 10 pages, 4 captioned figures, published version, figures at
http://aliceinfo.cern.ch/ArtSubmission/node/389
Two-pion Bose-Einstein correlations in central Pb-Pb collisions at = 2.76 TeV
The first measurement of two-pion Bose-Einstein correlations in central Pb-Pb
collisions at TeV at the Large Hadron Collider is
presented. We observe a growing trend with energy now not only for the
longitudinal and the outward but also for the sideward pion source radius. The
pion homogeneity volume and the decoupling time are significantly larger than
those measured at RHIC.Comment: 17 pages, 5 captioned figures, 1 table, authors from page 12,
published version, figures at
http://aliceinfo.cern.ch/ArtSubmission/node/388
Estimating the density of honeybee colonies across their natural range to fill the gap in pollinator decline censuses
Although pollinator declines are a global biodiversity threat, the demography of the western
honeybee (Apis mellifera) has not been considered by conservationists because it is biased by the activity of
beekeepers. To fill this gap in pollinator decline censuses and to provide a broad picture of the current status
of honeybees across their natural range, we used microsatellite genetic markers to estimate colony densities
and genetic diversity at different locations in Europe, Africa, and central Asia that had different patterns of
land use. Genetic diversity and colony densities were highest in South Africa and lowest in Northern Europe
and were correlated with mean annual temperature. Confounding factors not related to climate, however,
are also likely to influence genetic diversity and colony densities in honeybee populations. Land use showed a
significantly negative influence over genetic diversity and the density of honeybee colonies over all sampling
locations. In Europe honeybees sampled in nature reserves had genetic diversity and colony densities similar
to those sampled in agricultural landscapes, which suggests that the former are not wild but may have come
from managed hives. Other results also support this idea: putative wild bees were rare in our European
samples, and the mean estimated density of honeybee colonies on the continent closely resembled the reported
mean number of managed hives. Current densities of European honeybee populations are in the same range
as those found in the adverse climatic conditions of the Kalahari and Saharan deserts, which suggests that
beekeeping activities do not compensate for the loss of wild colonies. Our findings highlight the importance
of reconsidering the conservation status of honeybees in Europe and of regarding beekeeping not only as a
profitable business for producing honey, but also as an essential component of biodiversity conservation.This project was funded by the BEESHOP
European network (FOOD-CT-2006-022568) and the National
Research Foundation of South Africa
Tax Professionals' View of the Spanish Tax System: Efficiency, Equity and Tax Planning
Why Firms Relocate Their Production Overseas? The Answer Lies Inside: Corporate, Logistic and Technological Determinants
Vote buying or (political) business (cycles) as usual?
We study the short-run effect of elections on monetary aggregates in a sample of 85 low and middle income democracies (1975-2009). We find an increase in the growth rate of M1 during election months of about one tenth of a standard deviation. A similar effect can neither be detected in established OECD democracies nor in other months. The effect is larger in democracies with many poor and uneducated voters, and in Sub-Saharan Africa, Latin America, and in East-Asia and the Pacific. We argue that the election month monetary expansion is related to systemic vote buying which requires significant amounts of cash to be disbursed right before elections. The finely timed increase in M1 is consistent with this; is inconsistent with a monetary cycle aimed at creating an election time boom; and it cannot be, fully, accounted for by alternative explanations
Bypassing Progressive Taxation: Fraud and Base Erosion in the Spanish Income Tax (1970-2001)
The Distribution of Skills Among the European Adult Population and Unemployment: A Comparative Approach
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