40,582 research outputs found
Wizarding World of Harry Potter and Medical Librarianship
How are Harry Potter and medical librarianship related? Come answer the questions (all pulled from the various books of JK Rowling\u27s Harry Potter series) that my poster poses, and I\u27ll tell you
Sharp asymptotics for metastability in the random field Curie-Weiss model
In this paper we study the metastable behavior of one of the simplest
disordered spin system, the random field Curie-Weiss model. We will show how
the potential theoretic approach can be used to prove sharp estimates on
capacities and metastable exit times also in the case when the distribution of
the random field is continuous. Previous work was restricted to the case when
the random field takes only finitely many values, which allowed the reduction
to a finite dimensional problem using lumping techniques. Here we produce the
first genuine sharp estimates in a context where entropy is important.Comment: 56 pages, 5 figure
Quark-Hadron Duality in Structure Functions
Quark-hadron duality is studied in a systematic way for both the unpolarized
and polarized structure functions, by taking into account all the available
data in the resonance region.In both cases, a detailed perturbative QCD based
analysis of the structure functions integrals in the resonance region is
performed: non perturbative contributions are disentangled, and higher twist
terms are evaluated. A different behavior between the unpolarized and polarized
structure functions at low Q^2 is found.Comment: 5 pages, 4 figure
A Perturbative QCD Based Study of Polarized Nucleon Structure in the Transition Region and Beyond: "Quarks, Color Neutral Clusters, and Hadrons"
A large fraction of the world data on both polarized and unpolarized
inclusive scattering at large Bjorken lies in the resonance region
where a correspondence with the deep inelastic regime, known as Bloom and
Gilman's duality, was observed. Recent analyses of the dependence of the
data show that parton-hadron duality is inconsistent with the twist expansion
at low values of the final state invariant mass. We investigate the nature of
this disagreement, and we interpret its occurrence in terms of contributions
from non partonic degrees of freedom in a preconfinement model.Comment: 5 pages, 1 figure, to be published in the Proceedings of the "3rd
International Symposium on the Gerasimov-Drell-Hearn Sum Rule and its
Extensions", Editors, J.P. Chen and S. Kuh
From Passive to Active: A New Model for Library Orientation
Objectives This poster shares the experience of academic librarians turning a traditional, passive library orientation at a Graduate Medical Education Fair for new residents into an active learning activity.
Methods Every summer, new residents enter postgraduate medical training programs at the medical center. In an effort to introduce the library early in their clinical careers, liaison librarians have participated at a Graduate Medical Education fair since 2012. In the past, the library’s orientation activity consisted of a table full of paper handouts, staffed by overzealous librarians. Feedback from the residents, however, revealed that they politely collected the paperwork but frequently used or understood little of its content. In 2016, the library orientation for new residents was completely redesigned and updated. The traditional library handouts were replaced by an active learning exercise centered around a poster that highlighted the essential resources and services provided by the library. Residents were asked to spend just 1 minute reading through the library poster, and then invited to complete a brief poster survey.
Results Results of this new orientation format were quite revealing. Completed poster surveys were returned by more than 85% of the residents, showing that they liked the poster format and its effectiveness in introducing the library. The poster also prompted many questions and interesting conversations among residents and librarians right on the spot. The simple design of the survey questions encouraged residents to identify what they liked and wanted to learn more about the library. In addition, the survey fostered a perfect opportunity to ask questions about anything important that was included or missing from the poster.
Conclusions Librarians plan to continue to use this poster driven learning activity, to study its results, to modify its content when appropriate, and to build on its success in other library presentations
On soft capacities, quasi-stationary distributions and the pathwise approach to metastability
Motivated by the study of the metastable stochastic Ising model at
subcritical temperature and in the limit of a vanishing magnetic field, we
extend the notion of (, )-capacities between sets, as well as
the associated notion of soft-measures, to the case of overlapping sets. We
recover their essential properties, sometimes in a stronger form or in a
simpler way, relying on weaker hypotheses. These properties allow to write the
main quantities associated with reversible metastable dynamics, e.g. asymptotic
transition and relaxation times, in terms of objects that are associated with
two-sided variational principles. We also clarify the connection with the
classical "pathwise approach" by referring to temporal means on the appropriate
time scale.Comment: 29 pages, 1 figur
Thermodynamic Limit for Mean-Field Spin Models
If the Boltzmann-Gibbs state of a mean-field -particle system
with Hamiltonian verifies the condition for every decomposition , then its free
energy density increases with . We prove such a condition for a wide class
of spin models which includes the Curie-Weiss model, its p-spin generalizations
(for both even and odd p), its random field version and also the finite pattern
Hopfield model. For all these cases the existence of the thermodynamic limit by
subadditivity and boundedness follows.Comment: 15 pages, few improvements. To appear in MPE
Design Of An Induction Probe For Simultaneous Measurements Of Permittivity And Resistivity
In this paper, we propose a discussion of the theoretical design and move
towards the development and engineering of an induction probe for electrical
spectroscopy which performs simultaneous and non invasive measurements on the
electrical RESistivity \rho and dielectric PERmittivity \epsilon r of
non-saturated terrestrial ground and concretes (RESPER probe). In order to
design a RESPER which measures \rho and \epsilon r with inaccuracies below a
prefixed limit (10%) in a band of low frequencies (LF) (B=100kHz), the probe
should be connected to an appropriate analogical digital converter (ADC), which
samples in uniform or in phase and quadrature (IQ) mode, otherwise to a lock-in
amplifier. The paper develops only a suitable number of numerical simulations,
using Mathcad, which provide the working frequencies, the electrode-electrode
distance and the optimization of the height above ground minimizing the
inaccuracies of the RESPER, in galvanic or capacitive contact with terrestrial
soils or concretes, of low or high resistivity. As findings of simulations, we
underline that the performances of a lock-in amplifier are preferable even when
compared to an IQ sampling ADC with high resolution, under the same operating
conditions. As consequences in the practical applications: if the probe is
connected to a data acquisition system (DAS) as an uniform or an IQ sampler,
then it could be commercialized for companies of building and road paving,
being employable for analyzing "in situ" only concretes; otherwise, if the DAS
is a lock-in amplifier, the marketing would be for companies of geophysical
prospecting, involved to analyze "in situ" even terrestrial soils.Comment: 37 pages, 7 figures, 3 table
Dual Instantons in Anti-membranes Theory
We introduce two ansatzs for the 3-form potential of Euclidean 11d
supergravity on skew-whiffed AdS_4 X S^7 background which results in two scalar
modes with m^2=-2 on AdS_4. Being conformally coupled with a quartic
interaction it is possible to find the exact solutions of the scalar equation
on this background. These modes turn out to be invariant under SU(4) subgroup
of SO(8) isometry group, whereas there are no corresponding SU(4) singlet BPS
operators of dimensions one or two on the boundary ABJM theory. Noticing the
interchange of 8_s and 8_c representations under skew-whiffing in the bulk, we
propose the theory of anti-membranes should similarly be obtained from ABJM
theory by swapping these representations. In particular, this enables us to
identify the dual boundary operators of the two scalar modes. We deform the
boundary theory by the dual operators and examine the fermionic field equations
and compare the solutions of the deformed theory with those of the bulk.Comment: 14 pages, minor changes, added ref
On the reconstruction of planar lattice-convex sets from the covariogram
A finite subset of is said to be lattice-convex if is
the intersection of with a convex set. The covariogram of
is the function associating to each u \in
\integer^d the cardinality of . Daurat, G\'erard, and Nivat and
independently Gardner, Gronchi, and Zong raised the problem on the
reconstruction of lattice-convex sets from . We provide a partial
positive answer to this problem by showing that for and under mild extra
assumptions, determines up to translations and reflections. As a
complement to the theorem on reconstruction we also extend the known
counterexamples (i.e., planar lattice-convex sets which are not
reconstructible, up to translations and reflections) to an infinite family of
counterexamples.Comment: accepted in Discrete and Computational Geometr
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