125,853 research outputs found
Geopolitica del turismo
No full textAntagonism among actors is typical in case of territorial planning and for this reason it is a topic for geopolitical studies, as Lacoste teach. It is also for this reason that many geopolitical cases concern “tourism”. In this book Bettoni and Giblin realize a direct link between Tourism and geopolitical beyond the classical study of Geography of tourism that never work on antagonism. They did that also thanks the cases of Marrakesh (Kourzak-Souali), Corsica (Martinetti), and Madagascar (Sarrasin)
Geopolitica del turismo
No full textAntagonism among actors is typical in case of territorial planning and for this reason it is a topic for geopolitical studies, as Lacoste teach. It is also for this reason that many geopolitical cases concern “tourism”. In this book Bettoni and Giblin realize a direct link between Tourism and geopolitical beyond the classical study of Geography of tourism that never work on antagonism. They did that also thanks the cases of Marrakesh (Kourzak-Souali), Corsica (Martinetti), and Madagascar (Sarrasin)
B. Giblin et Y. Lacoste (dir.), Géohistoire de l'Europe médiane
No full textMichel Michel. B. Giblin et Y. Lacoste (dir.), Géohistoire de l'Europe médiane. In: L'information géographique, volume 62, n°4, 1998. p. 189
Giblin B. (dir.) Nouvelle géopolitique des régions françaises
No full textBoyer Jean-Claude. Giblin B. (dir.) Nouvelle géopolitique des régions françaises . In: Annales de Géographie, t. 115, n°649, 2006. Wilderness. La nature en amérique du nord, sous la direction de Paul Arnould et Éric Glon. p. 324
Giblin B. (dir.) Nouvelle géopolitique des régions françaises
No full textBoyer Jean-Claude. Giblin B. (dir.) Nouvelle géopolitique des régions françaises . In: Annales de Géographie, t. 115, n°649, 2006. Wilderness. La nature en amérique du nord, sous la direction de Paul Arnould et Éric Glon. p. 324
Geografia del turismo e geopolitica in Italia
No full textTerritorial planning is very important in Tourism because most of projects in this field concern a collective work of different players. In this case the interpretation of the concept of territorial planning is directly linked to the vision that a scientist of this field can have. After a short explication of Lacoste and Merlin visions of “aménagement du territoire” we examine the evolution of Tourism geography in Italy starting from the origin of Italian Geographical Society
Going Beyond Counting First Authors in Author Co-citation Analysis
No full textThe present study examines one of the fundamental aspects of author co-citation analysis (ACA) - the way co-citation
counts are defined. Co-citation counting provides the data on which all subsequent statistical analyses and mappings
are based, and we compare ACA results based on two different types of co-citation counting - the traditional type that
only counts the first one among a cited work's authors on the one hand and a non-traditional type that takes into
account the first 5 authors of a cited work on the other hand. Results indicate that the picture produced through this non-traditional author co-citation counting contains more coherent author groups and is therefore considerably clearer. However, this picture represents fewer specialties in the research field being studied than that produced through the traditional first-author co-citation counting when the same number of top-ranked authors is selected and analyzed. Reasons for these effects are discussed
The flying men [music] /
No full textB. 4064 (Publisher number). For voice and piano.; Caption title.; Cover ill. by TW: Fighter piolot and military officers.; Pl. no.: B. 4064.; NLA's NL copy is a professional copy. ANL; Also available online http://nla.gov.au/nla.mus-vn1405844
Non-linear universe: the role of simulations, theory & machine learning in weak lensing cosmology
No full textThe coherent distortions in the observed shapes of distant galaxies, a consequence
of the spacetime curvature induced by the intervening large-scale structure of
the Universe, is an abundant reservoir of cosmological information. Via this
phenomenon of weak gravitational lensing, and a number of other independent
cosmological probes, the parameters of the standard model, ΛCDM, have been
inferred, now with uncertainties approaching the per cent level. In this era of
precision cosmology, however, we face new challenges. Elements of tension have
emerged between the measurements of the cosmological parameters from lowand
high-redshift probes, seemingly implying either a failure to account for all
relevant systematics, or perhaps even an incompleteness in the ΛCDM paradigm.
In this thesis, I develop novel methodologies in weak lensing, to enhance the
cosmological information extracted from current and future data sets. In this
pursuit, I adopt a three-pronged approach, combining new advances in theoretical
modelling, cutting-edge numerical simulations and recent developments in
machine learning. Applying this trinity of techniques to three distinct bodies of
research, described below, I construct new routes to improving the constraining
power of this cosmological probe.
A notable shortfall of the standard two-point statistics conventionally used in
weak lensing, is their inability to capture all of the information contained in the
non-linear cosmological fields of the real Universe. In answer to this problem, I
develop the use of “clipping” transformations, which suppress the signal from
the highest density regions observed. I present the first “clipped” cosmic
shear measurement using data from the Kilo-Degree Survey (KiDS-450), and
employ a suite of numerical simulations to calibrate and explore the cosmological
dependence of this novel statistic. I show that these transformations improve
constraints on S8 = σ8(Ωm/0.3)0.5, where Ωm is the mass energy density and
σ8 is the amplitude of matter density fluctuations, when used in combination
with conventional, “unclipped” two-point statistics, by 17% in the case of the
KiDS-450 data.
Clipping is but one member of the non-Gaussian statistics family, which have
great potential for improving cosmological constraints, but are reliant both on
numerical simulations, and a robust means to interpolate the statistics measured
in the simulations to arbitrary cosmologies for comparison to the data. In
this thesis, I develop a general framework to facilitate this, by designing and
training a Gaussian process emulator, employing Bayesian supervised machine
learning, on the state-of-the-art cosmo-SLICS suite, consisting of 26 different
wCDM cosmologies. I demonstrate that this emulator achieves per cent level
interpolation accuracy, in turn yielding unprecedented precision in the estimation
of non-Gaussian statistics. I subsequently show how the cosmo-SLICS emulator
might be employed within a likelihood analysis to constrain the cosmology of
next-generation lensing data using these non-standard statistical probes. Taking
clipped shear correlation functions as an example, I find that the low levels of noise
present in the cosmo-SLICS emulator’s predictions facilitate improved constraints
on cosmological parameters when the clipped and unclipped two-point probes are
combined, not only for S8, but also for Ωm, and the Hubble and dark energy
equation of state parameters, by 18%-26%.
Finally, I combine the emulator approach with recent progress in theoretical
modelling, to create a comprehensive framework for accurately predicting the
non-linear matter power spectrum in arbitrary models of cosmology. This requires
only a suite of vanilla ΛCDM N-body simulations with their initial conditions
suitably tailored, such that the late-time non-linear power spectrum deviates from
the standard model within a range permitted by observational constraints. These
“pseudo” power spectra serve as the training set for the emulator, the predictions
from which can be rescaled by reaction functions, analytically computed from the
halo model, to obtain per cent level accurate non-linear predictions in a broadclass
of beyond-ΛCDM cosmologies. In this proof-of-concept analysis, with a
halofit training set substituting the simulation suite, I find that the emulator
recovers the power spectra corresponding to f(R) gravity, massive neutrino
cosmologies, combinations thereof, and even artificially generated departures from
the ΛCDM prediction, with errors ≲ 1% deep in the highly non-linear regime.
This work thus demonstrates a flexible and powerful method to not only test
the validity of the standard model in the non-linear regime with next-generation
cosmological data, but to also limit our reliance on costly numerical simulations
in the future
Dispelling the Myths Behind First-author Citation Counts
No full textWe conducted a full-scale evaluative citation analysis study of scholars in the XML research field to explore just how different from each other author rankings resulting from different citation counting methods actually are, and to demonstrate the capability of emerging data and tools on the Web in supporting more realistic citation counting methods. Our results contest some common arguments for the continued
use of first-author citation counts in the evaluation of scholars, such as high correlations between author rankings by first-author citation counts and other citation
counting methods, and high costs of using more realistic citation counting methods that are not well-supported by the ISI databases. It is argued that increasingly available digital full text research papers make it possible for citation analysis studies to go beyond what the ISI databases have directly supported and to employ more
sophisticated methods
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