26 research outputs found
Remesas e inclusión financiera en municipios del Noreste de México: Un análisis espacio - temporal bayesiano
Este trabajo tiene por objetivo analizar la distribución espacio-temporal de las remesas en los municipios del noreste de México derivada del efecto de los servicios financieros, y por tanto, se enfoca en estudiar la relación entre el flujo de remesas y la inclusión financiera, considerando la infraestructura y red existente de servicios bancarios en los municipios de la región, al tiempo que se argumenta que la inclusión financiera puede apoyar la acumulación de recursos a través del ahorro y permitir el acceso a créditos, seguros y otro tipo de productos financieros. Los resultados muestran que la concentración de recursos en instituciones y municipios con mayor presencia de instituciones bancarias puede, evidentemente, llevar a la expansión de pequeños negocios, a la generación de ingresos derivados del desarrollo de micronegocios y a la inversión productiva especialmente en segmentos de bajos recursos y que esto se encuentra asociado a la recepción de remesas, asimismo se busca destacar la importancia de comprender las complejas interacciones entre la migración internacional, las remesas y la economía
Effective Lagrangian Approach to Weak Radiative Decays of Heavy Hadrons
Motivated by the observation of the decay by
CLEO, we have systematically analyzed the two-body weak radiative decays of
bottom and charmed hadrons. There exist two types of weak radiative decays: One
proceeds through the short-distance transition and the other
occurs through -exchange accompanied by a photon emission. Effective
Lagrangians are derived for the -exchange bremsstrahlung processes at the
quark level and then applied to various weak electromagnetic decays of heavy
hadrons. Predictions for the branching ratios of and
\Xi_b^0\to\xip_c^0\gamma are given. In particular, we found . Order of magnitude
estimates for the weak radiative decays of charmed hadrons: and
are also presented. Within this approach, the decay asymmetry for antitriplet
to antitriplet heavy baryon weak radiative transitions is uniquely predicted by
heavy quark symmetry. The electromagnetic penguin contribution to
is estimated by two different methods and its
branching ratio is found to be of order . We conclude that
weak radiative decays of bottom hadrons are dominated by the short-distance
mechanism.Comment: 28 pages + 3 figures (not included), CLNS 94/1278, IP-ASTP-04-94.
[Main changes in this revised version: (i) Sect 2 and subsection 4.1 are
revised, (ii) A MIT bag method for calculating the decay rate of is presented, (iii) All predictions are updated using the
newly available 1994 Particle Data Group, and (iv) Appendix and subsections
3.3 and 4.4 are deleted.
Nonleptonic decays to , and other final states in Factorization
We consider nonleptonic Cabibbo--allowed decays in the
factorization approximation. We calculate nonleptonic decays of the type and relative to
and where we include among the
pseudoscalar states(P) and the vector states(V) the newly discovered
resonances, and . In the ratio of decays to
and relative to the decays to these states,
the poorly known decay constants of and cancel leading
to predictions that can shed light on the nature of these new states. In
general, we predict the decays to be larger than the corresponding
decays and in particular we find the branching ratio for can be between four to five times the branching ratio
for . This enhancement of branching
ratios follows primarily from the fact that more partial waves contribute in
decays than in decays. Our predictions are largely
independent of model calculations of hadronic inputs like form factors and
decay constants.Comment: 16 pages LaTe
Photography-based taxonomy is inadequate, unnecessary, and potentially harmful for biological sciences
The question whether taxonomic descriptions naming new animal species without type specimen(s) deposited in collections should be accepted for publication by scientific journals and allowed by the Code has already been discussed in Zootaxa (Dubois & Nemésio 2007; Donegan 2008, 2009; Nemésio 2009a–b; Dubois 2009; Gentile & Snell 2009; Minelli 2009; Cianferoni & Bartolozzi 2016; Amorim et al. 2016). This question was again raised in a letter supported
by 35 signatories published in the journal Nature (Pape et al. 2016) on 15 September 2016. On 25 September 2016, the following rebuttal (strictly limited to 300 words as per the editorial rules of Nature) was submitted to Nature, which on
18 October 2016 refused to publish it. As we think this problem is a very important one for zoological taxonomy, this text is published here exactly as submitted to Nature, followed by the list of the 493 taxonomists and collection-based
researchers who signed it in the short time span from 20 September to 6 October 2016
El conflicto entre cristianos y musulmanes en las relaciones de sucesos : la liberación de Buda
Este trabajo propone el análisis de una selección de textos escritos en romance sobre la derrota turca y la toma de la ciudad de Buda en 1686, que denuncian la exultante acogida popular de la noticia de las gestas cristianas en Centroeuropa, la percepción del eterno conflicto entre Oriente y Occidente y la proyección del imaginario colectivo del siglo xvii acerca de la lucha contra los infieles.This paper offers the analysis of a selection of texts, written in Romance languages, about the Turkish defeat and the conquest of the city of Buda in 1686, which provide evidence of the popular exultation at the news of the Christian achievements in Central Europe, the perception of the eternal conflict between East and West, and the projection of the seventeenth-century collective imagination regarding the struggle against the infidel
Style polymorphism in Linum (Linaceae): a case of Mediterranean parallel evolution?
•Heterostyly is a sex polymorphism that has challenged evolutionary biologists eversince Darwin. One of the lineages where heterostyly and related stylar conditionsappear more frequently isLinum(Linaceae). This group is particularly suitable fortesting competing hypotheses about ancestral and transitional stages on the evolution-ary building up of heterostyly.•We generated a phylogeny ofLinumbased on extensive sampling and plastid andnuclear DNA sequences, and used it to trace the evolution of character states of stylepolymorphism. We also revised available data on pollination, breeding systems, andpolyploidy to analyse their associations.•Our results supported former phylogenetic hypotheses: the paraphyly ofLinumandthe non-monophyly of current taxonomic sections. Heterostyly was common in thegenus, but appeared concentrated in the Mediterranean Basin and the South AfricanCape. Ancestral character state reconstruction failed to determine a unique state as themost probable condition for style polymorphism in the genus. In contrast, approachherkogamy was resolved as ancestral state in some clades, giving support to recenthypotheses. Some traits putatively related to heterostyly, such as life history and poly-ploidy, did show marginal or non-significant phylogenetic correlation, respectively.Although pollinator data are limited, we suggest that beeflies are associated with speci-fic cases of heterostyly.•The consistent association between style polymorphism and heteromorphic incompat-ibility points to ecological factors as drivers of the multiple evolution of style polymor-phism inLinum. Albeit based on limited evidence, we hypothesised that specialisedpollinators and lack of mating opportunities drive evolution of style polymorphismand loss of the polymorphism, respectively.Ministerio de Economía, Industria y Competitividad de España (MINECO)-CGL2013-45037-P, CGL2010-11379-E, CGL2009-12565 y CGL2006-13847-CO2-0