1,476 research outputs found
Tough immigration enforcement likely hinders public cooperation with the police, and may undermine crime reporting
The 2016 presidential election campaign has brought the role of immigrants in US society into sharp focus, with some Republican candidates claiming that they fuel crime. Carmen Gutierrez and David Kirk write that this anti-immigration rhetoric may actually be undermining public safety by eroding trust in the law. Examining the relationship between a city’s immigrant population and victimizations reported to police, they find that increased immigration is associated with lower reporting of violent crimes. They argue that these results may be due to concerns about detection and deportation experienced by undocumented immigrants who wish to avoid contact with the police
Photometric scaling relations of antitruncated stellar discs in S0-Scd galaxies
It has been recently found that the characteristic photometric parameters of
antitruncated discs in S0 galaxies follow tight scaling relations. We
investigate if similar scaling relations are satisfied by galaxies of other
morphological types. We have analysed the trends in several photometric planes
relating the characteristic surface brightness and scalelengths of the breaks
and the inner and outer discs of local antitruncated S0-Scd galaxies, using
published data and fits performed to the surface brightness profiles of two
samples of Type-III galaxies in the R and Spitzer 3.6 microns bands. We have
performed linear fits to the correlations followed by different galaxy types in
each plane, as well as several statistical tests to determine their
significance. We have found that: 1) the antitruncated discs of all galaxy
types from Sa to Scd obey tight scaling relations both in R and 3.6 microns, as
observed in S0s; 2) the majority of these correlations are significant
accounting for the numbers of the available data samples; 3) the trends are
clearly linear when the characteristic scalelengths are plotted on a
logarithmic scale; and 4) the correlations relating the characteristic surface
brightnesses of the inner and outer discs and the breaks with the various
characteristic scalelengths significantly improve when the latter are
normalized to the optical radius of the galaxy. The results suggest that the
scaling relations of Type-III discs are independent of the morphological type
and the presence (or absence) of bars within the observational uncertainties of
the available datasets, although larger and deeper samples are required to
confirm this. The tight structural coupling implied by these scaling relations
impose strong constraints on the mechanisms proposed for explaining the
formation of antitruncated stellar discs in the galaxies across the whole
Hubble Sequence (Abridged).Comment: Accepted for publication in Astronomy & Astrophysics, 18 pages, 12
figures, 7 table
Matching system for Animal-assisted therapy based on the Levenshtein and Gale-Shapley algorithms
This current research is based on the implementation of an algorithm that assigns pets,
cats, or dogs to persons with depressive disorders such as low self-esteem. We found that
even though different institutions have made the assignments of pets to patients, we were
not able to found one that uses an IT tool for this task. Because of this situation, we
decided to adapt to the well-known Gale-Shapley algorithm that has been used
successfully in different situations in which it needs a perfect match between two parties.
The results obtained have been validated by experts in the field of animal and person
psychology. Because the Gale-Shapley algorithm needs a preference array between the
parts involved and due that an animal cannot establish this set of preferences, we aimed
to use a string similarity-based algorithm for obtaining preferences arrays based on the
behavioral traits of an animal or person
Préstamos con cláusula multidivisa referenciados en cesta sintética de divisas
La decisión de solicitar un préstamo en divisas suele obedecer a situaciones de
fortaleza de algunas divisas o a altos tipos de interés. La principal ventaja de éstos
préstamos estará representada por la elección de monedas con tipos de interés bajos en
términos relativos. Aunque si bien es cierto que, cuanto más bajos sean los tipos de interés,
mayor -en buena lógica- será el riesgo de cambio asumido por el prestatario. Como en toda
operación que implique un endeudamiento en divisas, el riesgo de cambio es un
importantÃsimo extremo a tener en cuenta.
En la presente comunicación exponemos una técnica reductora del riesgo de
cambio en los préstamos con cláusula de divisas consistente en la elección de
combinaciones óptimas de divisas (cestas sintéticas) en las que se referencie el préstamo,
realizando la oportuna constatación empÃrica de que la diversificación de la cartera de
divisas es el primer paso para la reducción del riesgo de cambio. La metodologÃa propuesta
para la determinación de la cesta sintética de divisas, el desarrollo del cuadro amortizativo
para un préstamo tipo y las conclusiones más relevantes a las que llegamos, constituirán el
contenido fundamental de este trabajo.
La técnica de reducción del riesgo de cambio por cesta sintética de divisas
será utilizable por la mediana y gran empresa española en los préstamos solicitados en
monedas diferentes del euro. Resulta una técnica sencilla y a la vez eficaz en la reducción
del riesgo de cambio, que puede contribuir a la mejora en la eficiencia de la gestión
empresarial ante un mejor aprovechamiento de oportunidades de financiación que pudieran
surgir
EmbriologÃa e histologÃa
GuÃa pedagógic
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