2,265 research outputs found
Stochastic inviscid shell models: well-posedness and anomalous dissipation
In this paper we study a stochastic version of an inviscid shell model of
turbulence with multiplicative noise. The deterministic counterpart of this
model is quite general and includes inviscid GOY and Sabra shell models of
turbulence. We prove global weak existence and uniqueness of solutions for any
finite energy initial condition. Moreover energy dissipation of the system is
proved in spite of its formal energy conservation.Comment: v2 has updated introductio
Mitochondrial DNA lineages of Italian Giara and Sarcidano horses
Giara and Sarcidano are 2 of the 15 extant native Italian horse breeds with limited dispersal capability that originated from a larger number of individuals. The 2 breeds live in two distinct isolated locations on the island of Sardinia. To determine the genetic structure and evolutionary history of these 2 Sardinian breeds, the first hypervariable segment of the mitochondrial DNA (mtDNA) was sequenced and analyzed in 40 Giara and Sarcidano horses and compared with publicly available mtDNA data from 43 Old World breeds. Four different analyses, including genetic distance, analysis of molecular variance, haplotype sharing, and clustering methods, were used to study the genetic relationships between the Sardinian and other horse breeds. The analyses yielded similar results, and the FST values indicated that a high percentage of the total genetic variation was explained by between-breed differences. Consistent with their distinct phenotypes and geographic isolation, the two Sardinian breeds were shown to consist of 2 distinct gene pools that had no gene flow between them. Giara horses were clearly separated from the other breeds examined and showed traces of ancient separation from horses of other breeds that share the same mitochondrial lineage. On the other hand, the data from the Sarcidano horses fit well with variation among breeds from the Iberian Peninsula and North-West Europe: genetic relationships among Sarcidano and the other breeds are consistent with the documented history of this breed
Full Characterization of the First 1 Inch Industrial Prototype of a New Concept Photodetector
The VSiPMT (Vacuum Silicon PhotoMultiplier Tube) is an original design for an
innovative light detector we proposed with the aim to create new scientific
instrumentation for industrial applications and physics research. The idea
behind this device is to replace the classical dynode chain of a
photomultiplier tube with a silicon photomultiplier, the latter acting as an
electron detector and amplifier. The VSiPMT offers very attractive features and
unprecedented performance, definitely superior to every other photodetector
with comparable sensitive surface, such as: negligible power cosumption,
excellent photon counting, easy low-voltage-based stabilization and very good
time performance. After the feasibility test of the idea, Hamamatsu Photonics
realized for our research group two VSiPMT industrial prototypes, that have
been fully characterized. The results of the full characterization of the
1-inch industrial prototype are presented in this work.Comment: 11 pages, 14 figure
Global regularity for a slightly supercritical hyperdissipative Navier-Stokes system
We prove global existence of smooth solutions for a slightly supercritical hyperdissipative Navier--Stokes under the optimal condition on the correction to the dissipation. This proves a conjecture formulated by Tao [Tao2009]
Global regularity for a logarithmically supercritical hyperdissipative dyadic equation
We prove global existence of smooth solutions for a slightly supercritical dyadic model. We consider a generalized version of the dyadic model introduced by Katz-Pavlovic [KatPav2004] and add a viscosity term with critical exponent and a supercritical correction. This model catches for the dyadic a conjecture that for Navier-Stokes equations was formulated by Tao [Tao2009
Italian adaptation of the MOQ-T as a fast screening instrument based on teachers' ratings for identifying developmental coordination disorder symptoms
The present study was designed to collect data on the Italian adaptation of the Motor Observation Questionnaire for Teachers (MOQ-T, Schoemaker, Flapper, Reinders-Messelink, & De Kloet, 2008). We provide data for 2nd, 3rd, 4th and 5th grades, in some cases distinguishing males from females. On the basis of the present and previous evidence (Giofrè et al., 2014) the MOQ-T appears a valid and a fast screening instrument for detecting developmental coordination disorders (DCD) symptoms (on the basis of teachers' ratings) in children and can be very important as a first step in the process for diagnosing DCD
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