5,265 research outputs found
Corsarios y piratas ingleses y holandeses en el Sureste español durante el reinado de Felipe III (1598-1621)
En las primeras décadas del siglo XVII, y al calor del próspero comercio y la intensa circulación de embarcaciones mercantes en los puertos de Alicante y Cartagena, acudieron diferentes piratas de los paÃses protestantes del Atlántico, una vez concluidas por éstos paces o treguas con España. Fueron militares reconvertidos en piratas, como los ingleses John Ward, Henry Mainwaring, Robert Walsingham y Peter Easton, o el famoso corsario flamenco Simon de Danser al que acompañaron algunos compatriotas suyos como Salomo de Veenboer y Jan Janszoon, los cuales entraron en connivencia con los corsarios de Argel y Túnez, formado escuadras mixtas o aliadas que hicieron mucho daño a la actividad mercantil desplegada desde el Sureste español, sin que encontraran la adecuada réplica por parte española.In the first decades of the 17th century, and due to the prosperous trade and the intensive traffic of merchant ships in the ports of Alicante and Cartagena, different pirates of the Protestant countries of the Atlantic carne, once they had signed a peace agreement or agreed to a truce with Spain. They were military men who became pirates, such as the English John Ward, Henry Mainwaring, Robert Walsingham and Peter Easton, or the well-known Flemish corsair Simon de Danser, whom some compatriots such as Salomo de Veenboer and Jan Janszoon accompanied. These acted in connivance with the corsairs from Algiers and Tunisia, forming mixed or allied squads that had an adverse effect on the commercial activity displayed by the South-East of Spain. However, they did not find a suitable reply on the Spanish part
Nuevos resultados sobre la derivada fraccionaria conformable de Khalil
This article establishes certain important results for mathematical analysis, specifically related to conformable derivatives of fractional order, among them the following stand out: the chain rule, the Cauchy mean value theorem and L’Hopital’s rule. These results are expected to stimulate research in this area.En el presente artÃculo se establecen ciertos resultados de importancia para el análisis matemático, especÃficamente relacionados con las derivadas conformables de orden fraccional, entre ellos se destacan: la regla de la cadena, el Teorema del valor medio de Cauchy y la Regla de L’Hopital. Se espera que estos resultados estimulen la investigación en esta área
Masses and semileptonic decays of doubly heavy baryons in a nonrelativistic quark model
We evaluate masses and semileptonic decay widths for the ground state of
doubly heavy and baryons in the framework of a nonrelativistic
quark model. We solve the three-body problem by means of a variational ansatz
made possible by heavy-quark spin symmetry constraints. Our masses are
comparable to the ones obtained in relativistic calculations and we get one of
the best agreements with lattice data. Our simple wave functions are used to
evaluate semileptonic decays of doubly heavy and baryons. Our results for the decay widths are in reasonable
agreement with calculations done in a relativistic calculation in the
quark-diquark approximation. We also check that our wave functions comply with
what it is expected in the infinite heavy quark mass limit.Comment: 3 latex pages, two tables. To appear in the INPC07 proceeding
Masses and semileptonic decays of doubly heavy baryons in a nonrelativistic quark model
We evaluate masses and semileptonic decay widths for the ground state of
doubly heavy and baryons in the framework of a nonrelativistic
quark model. We solve the three-body problem by means of a variational ansatz
made possible by heavy-quark spin symmetry constraints. Our masses are
comparable to the ones obtained in relativistic calculations and we get one of
the best agreements with lattice data. Our simple wave functions are used to
evaluate semileptonic decays of doubly heavy and baryons. Our results for the decay widths are in reasonable
agreement with calculations done in a relativistic calculation in the
quark-diquark approximation. We also check that our wave functions comply with
what it is expected in the infinite heavy quark mass limit.Comment: 3 latex pages, two tables. To appear in the INPC07 proceeding
Anomalous magnetic and weak magnetic dipole moments of the lepton in the simplest little Higgs model
We obtain analytical expressions, both in terms of parametric integrals and
Passarino-Veltman scalar functions, for the one-loop contributions to the
anomalous weak magnetic dipole moment (AWMDM) of a charged lepton in the
framework of the simplest little Higgs model (SLHM). Our results are general
and can be useful to compute the weak properties of a charged lepton in other
extensions of the standard model (SM). As a by-product we obtain generic
contributions to the anomalous magnetic dipole moment (AMDM), which agree with
previous results. We then study numerically the potential contributions from
this model to the lepton AMDM and AWMDM for values of the parameter
space consistent with current experimental data. It is found that they depend
mainly on the energy scale at which the global symmetry is broken and the
parameter, whereas there is little sensitivity to a mild change in
the values of other parameters of the model. While the AMDM is of the
order of , the real (imaginary) part of its AWMDM is of the order of
(). These values seem to be out of the reach of the
expected experimental sensitivity of future experiments.Comment: 23 pages, 11 figures, new analysis and References adde
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