4,212 research outputs found
Transparent Replication Using Metaprogramming in Cyan
Replication can be used to increase the availability of a service by creating
many operational copies of its data called replicas. Active replication is a
form of replication that has strong consistency semantics, easier to reason
about and program. However, creating replicated services using active
replication still demands from the programmer the knowledge of subtleties of
the replication mechanism. In this paper we show how to use the metaprogramming
infrastructure of the Cyan language to shield the application programmer from
these details, allowing easier creation of fault-tolerant replicated
applications through simple annotations.Comment: 8 page
Copaiba oil-resin treatment is neuroprotective and reduces neutrophil recruitment and microglia activation after motor cortex excitotoxic injury.
The oil-resin of Copaifera reticulata Ducke is used in the Brazilian folk medicine as an anti-in?ammatory and healing agent. However, there are no investigations on the possible anti-in?ammatory and neuroprotective roles of copaiba oil-resin (COR) after neural disorders. We have investigated the anti-in?ammatory and neuroprotective e?ects of COR following an acute damage to the motor cortex of adult rats. Animals were injected with the neurotoxin N-Methyl-D-Aspartate (NMDA) (n = 10) and treated with a single dose of COR (400 mg/kg, i.p.) soon after surgery (Group 1) or with two daily doses (200 mg/kg, i.p.) during 3 days (Group 2) alter injury. Control animals were treated with vehicle only. COR treatment induced tissue preservation and decreased the recruitment of neutrophils and microglial activation in the injury site compared to vehicle animals. The results suggest that COR treatment induces neuroprotection by modulating in?ammatory response following an acute damage to the central nervous system
Turbulence driven particle transport in Texas Helimak
We analyze the turbulence driven particle transport in Texas Helimak (K. W.
Gentle and Huang He, Plasma Sci. and Technology, 10, 284 (2008)), a toroidal
plasma device with one-dimensional equilibrium with magnetic curvature and
shear. Alterations on the radial electric field, through an external voltage
bias, change spectral plasma characteristics inducing a dominant frequency for
negative bias values and a broad band frequency spectrum for positive bias
values. For negative biased plasma discharges, the transport is high where the
waves propagate with phase velocities near the plasma flow velocity, an
indication that the transport is strongly affected by a wave particle resonant
interaction. On the other hand, for positive bias the plasma has a reversed
shear flow and we observe that the transport is almost zero in the shearless
radial region, an evidence of a transport barrier in this region.Comment: 8 pages, 11 figure
Cosmic String in Scalar-Tensor Gravity
The gravitational properties of a local cosmic string in the framework of
scalar-tensor gravity are examined. We find the metric in the weak-field
approximation and we show that, contrary to the General Relativity case, the
cosmic string in scalar-tensor gravitation exerces a force on non-relativistic,
neutral test particle. This force is proportional to the derivative of the
conformal factor and it is always attractive. Moreover, this
force could have played an important role at the Early Universe, although
nowadays it can be neglegible. It is also shown that the angular separation
remains unaltered for scalar-tensor cosmic strings.Comment: 15 pages, LATEX, no figure
Cosmic String Wakes in Scalar-Tensor Gravities
The formation and evolution of cosmic string wakes in the framework of a
scalar-tensor gravity are investigated in this work. We consider a simple model
in which cold dark matter flows past an ordinary string and we treat this
motion in the Zel'dovich approximation. We make a comaprison between our
results and previous results obtained in the context of General Relativity. We
propose a mechanism in which the contribution of the scalar field to the
evolution of the wakes may lead to a cosmological observation.Comment: Replaced version to be published in the Classical and Quantum Gravit
Occurrence of Pseudomonas corrugata causing pith necrosis on tomato plants in Goiás, Brazil.
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Previous issue date: 2008-04-2
Curtobacterium flaccumfaciens pv. flaccumfaciens Murcha bacteriana do feijoeiro e da soja: alto risco de disseminação no Brasil.
bitstream/CENARGEN/27933/1/cot117.pd
Embryo production using epididymal sperm submitted to different selection methods and their influence on the embryo sex.
Proceedings of the 31st Annual Meeting of the Brazilian Embryo Technology Society (SBTE); Cabo de Santo Agostinho, PE, Brazil, August 17th to 19th, 2017. Abstract
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