305 research outputs found
EU-NATO relations:Running on the fumes of informed deconfliction
This article provides the framework for the contributions to this special issue. It first puts the theme into context and outlines the main issues that justify further analytical engagement with European Union (EU)âNorth Atlantic Treaty Organization (NATO) relations to the extent we propose here. We then provide some historical background to frame the discussion, and in doing so also outline the current state of interaction between the EU and NATO. We then briefly contextualise the changing strategic environment shaping the relationship, including recent proposals to implement their declared âstrategic partnershipâ. This introduction then presents an overview of the existing literature to set the stage for a renewed look at the research agenda that has emerged over the last two decades. We close with an outline of the individual contributions to this special issue, which are presented in two sections: one focusing on theoretical and conceptual approaches to the study of EU of EUâNATO relations, and one on the inter-organisational relationship in practice, followed by a concluding synopsis and outlook
Force and Motion Generation of Molecular Motors: A Generic Description
We review the properties of biological motor proteins which move along linear
filaments that are polar and periodic. The physics of the operation of such
motors can be described by simple stochastic models which are coupled to a
chemical reaction. We analyze the essential features of force and motion
generation and discuss the general properties of single motors in the framework
of two-state models. Systems which contain large numbers of motors such as
muscles and flagella motivate the study of many interacting motors within the
framework of simple models. In this case, collective effects can lead to new
types of behaviors such as dynamic instabilities of the steady states and
oscillatory motion.Comment: 29 pages, 9 figure
The natural capital accounting opportunity: Let s really do the numbers
This work was conducted as a part of the âAccounting for U.S. Ecosystem Services at National and Subnational Scalesâ working group supported by the National Socio-Environmental Synthesis Center under funding received from the National Science Foundation (grant no. DBI-1052875) and the US Geological Survey John Wesley Powell Center for Analysis and Synthesis (grant no. GX16EW00ECSV00)
The First VERITAS Telescope
The first atmospheric Cherenkov telescope of VERITAS (the Very Energetic
Radiation Imaging Telescope Array System) has been in operation since February
2005. We present here a technical description of the instrument and a summary
of its performance. The calibration methods are described, along with the
results of Monte Carlo simulations of the telescope and comparisons between
real and simulated data. The analysis of TeV -ray observations of the
Crab Nebula, including the reconstructed energy spectrum, is shown to give
results consistent with earlier measurements. The telescope is operating as
expected and has met or exceeded all design specifications.Comment: Accepted by Astroparticle Physic
Determination of Leptoquark Properties in Polarized Collisions
We study leptoquark production using polarized colliders for the
center of mass energies ~GeV and 1~TeV. We show that using
polarization asymmetries the ten different types of leptoquarks listed by
Buchm\"uller, R\"uckl and Wyler can be distinquished from one another for
leptoquark masses essentially up to the kinematic limit of the respective
colliders. Thus, if a leptoquark were discovered an collider could
play a crucial role in determining its origins.Comment: 10 pages (plus 10 postscript figures submitted separately), OCIP/C
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How To Find Charm in Nuclear Collisions at RHIC and LHC
Measurements of dilepton production from charm decay and Drell-Yan processes
respectively probe the gluon and sea quark distributions in hadronic
collisions. In nucleus-nucleus collisions, these hard scattering processes
constitute a `background' to thermal contributions from the hot matter produced
by the collision. To determine the magnitude and behavior of this background,
we calculate the hard scattering contribution to dilepton production in nuclear
collisions at RHIC and LHC at next to leading order in perturbative QCD.
Invariant mass, rapidity and transverse momentum distributions are presented.
We compare these results to optimistic hydrodynamic estimates of the thermal
dilepton production. We find that charm production from hard scattering is by
far the dominant contribution. Experiments therefore can measure the gluon
distribution in the nuclear target and projectile and, consequently, can
provide new information on gluon shadowing. We then illustrate how experimental
cuts on the rapidity gap between the leptons can aid in reducing the charm
background, thereby enhancing thermal information.Comment: 32 pages, latex, 19 figure
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