416 research outputs found
El efecto de redundancia en el aprendizaje predictivo humano: Evidencia en contra de una interpretación proposicional.
The redundancy effect is the finding of greater learning when an X stimulus is trained in an A+ AX+ blocking procedure, than when a Y stimulus is trained in a BY+ CY- discrimination procedure. These findings are new and theoretically challenging for all conditioning theories that calculate learning based on a common error. For this reason, we alternatively examined the possibility that the phenomenon is the result of a propositional reasoning. In an experiment, we replicated the basic effect and we found out that the addition of instructions on the occurrence of the consequences at a submaximal level does not have a significant impact on the redundancy effect. These findings are discussed with regard to a propositional and associative approach based on the assumption that the experimental stimuli share a common feature.El efecto de redundancia es el hallazgo de un mayor aprendizaje a un estÃmulo X entrenado en un procedimiento de bloqueo A+ AX+, que a un estÃmulo Y entrenado en un procedimiento de discriminación BY+ CY-. Estos hallazgos son nuevos y teóricamente desafiantes para todas las teorÃas del condicionamiento que calculan el aprendizaje en base a un error común. Es por ello que examinamos alternativamente la posibilidad que el fenómeno sea el resultado de un razonamiento proposicional. En un experimento, replicamos el efecto básico y encontramos que la adición de instrucciones sobre la ocurrencia de las consecuencias a un nivel sub-máximo no tiene un efecto significativo sobre el efecto de redundancia. Estos hallazgos son discutidos en relación con una aproximación proposicional y asociativa basada en el supuesto que los estÃmulos experimentales comparten un elemento común
Bernstein-Sato functional equations, -filtrations, and multiplier ideals of direct summands
This paper investigates the existence and properties of a Bernstein-Sato
functional equation in nonregular settings. In particular, we construct
-modules in which such formal equations can be studied. The existence of the
Bernstein-Sato polynomial for a direct summand of a polynomial over a field is
proved in this context. It is observed that this polynomial can have zero as a
root, or even positive roots. Moreover, a theory of -filtrations is
introduced for nonregular rings, and the existence of these objects is
established for what we call differentially extensible summands. This family of
rings includes toric, determinantal, and other invariant rings. This new theory
is applied to the study of multiplier ideals and Hodge ideals of singular
varieties. Finally, we extend known relations among the objects of interest in
the smooth case to the setting of singular direct summands of polynomial rings.Comment: 42 pages. A new section on Hodge ideals is included. Comments welcom
Bernstein's inequality and holonomicity for certain singular rings
In this manuscript we prove the Bernstein inequality and develop the theory
of holonomic D-modules for rings of invariants of finite groups in
characteristic zero, and for strongly F-regular finitely generated graded
algebras with FFRT in prime characteristic. In each of these cases, the ring
itself, its localizations, and its local cohomology modules are holonomic. We
also show that holonomic D-modules, in this context, have finite length. We
obtain these results using a more general version of Bernstein filtrations.Comment: 34 pages. Comments welcom
Supersymmetric probes on the conifold
We study the supersymmetric embeddings of different D-brane probes in the
AdS_5 x T^{1,1} geometry. The main tool employed is kappa symmetry and the
cases studied include D3-, D5- and D7-branes. We find a family of three-cycles
of the T^{1,1} space over which a D3-brane can be wrapped supersymmetrically
and we determine the field content of the corresponding gauge theory duals.
Supersymmetric configurations of D5-branes wrapping a two-cycle and of
spacetime filling D7-branes are also found. The configurations in which the
entire T^{1,1} space is wrapped by a D5-brane (baryon vertex) and a D7-brane
are also studied. Some other embeddings which break supersymmetry but are
nevertheless stable are also determined.Comment: 44 pages, LaTeX; v2: typos corrected, references added, discussion of
D5-brane embeddings improve
The Non-SUSY Baryonic Branch: Soft Supersymmetry Breaking of N=1 Gauge Theories
We study a non-supersymmetric deformation of the field theory dual to the
baryonic branch of Klebanov-Strassler. Using a combination of analytical
(series expansions) and numerical methods we construct non-supersymmetric
backgrounds that smoothly interpolate between the desired UV and IR behaviors.
We calculate various observables of the field theory and propose a picture of
soft breaking by gaugino masses that is consistent with the various
calculations on the string side.Comment: 32 pages plus many appendixes. One figur
The Structure of the Non-SUSY Baryonic Branch of Klebanov-Strassler
We study the two-dimensional space of supergravity solutions corresponding to
non-supersymmetric deformations of the baryonic branch of Klebanov-Strassler.
By combining analytical methods with a numerical survey of the parameter space,
we find that this solution space includes as limits the softly-broken N=1
solutions of Gubser et al. and those of Dymarsky and Kuperstein. We also
identify a one-dimensional family of solutions corresponding to a natural
non-supersymmetric generalisation of Klebanov-Strassler, and one corresponding
to the limit in which supersymmetry is completely absent, even in the far UV.
For almost all of the parameter space we find indications that much of the
structure of the supersymmetric baryonic branch survives.Comment: 29 pages plus appendices, 11 figure
Experimentación y validación de tecnologÃas adecuadas para pequeños productores ganaderos
Mineral supplementation with phosphorus and sodium was tested in cow-calf operations located in deficient areas as regards the minerals mentioned above in Mercedes, Corrientes, Argentina. Supplementation was carried out in three farms for 4 years: 176 observations for the supplemented group and 155 observations for the unsupplemented group were performed. 59% pregnancy rate was obtained in the supplemented group, however, 44% was obtained without supplementation. This result was financially advantageous for the producers.Se evaluó la suplementación mineral con fósforo y sodio en rodeos bovinos de crÃa en un área con deficiencia de dichos elementos en el departamento Mercedes, provincia de Corrientes, Argentina. Se realizó la práctica en 3 establecimientos durante 4 años en los que se totalizaron 176 observaciones en los lotes suplementados y 155 en los no suplementados. Se obtuvo un 59% de preñez al suplementar y 44% en los lotes que no recibieron dicha práctica, lo cual resulta rentable para el productor
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