8,630 research outputs found
Children with Disabilities and Delayed Entry to Kindergarten: To Send or Not to Send/Language Development: Communication Strategies in Early Childhood
Children with Disabilities and Delayed Entry to Kindergarten: To Send or Not to Send
This starred paper addresses the transition to kindergarten for students with disabilities. The inspiration for this paper came from the frequent conversations that are had between families and educators when it comes time to decide if a child is ready for the transition to kindergarten. This paper addresses the areas to consider in the transition from preschool. First addressing the five main areas of development; academic achievement, social/emotional development, communication, functional skills, and motor development. Although it is not a developmental area it is also important to review socioeconomic status and how this impacts a child\u27s transition to kindergarten. This paper also addresses transition stressors for children, parents, and educators as this too does impact the transition process for many students. This topic is important as many early childhood special education teachers will have these conversations each spring with their families about the transition to kindergarten. It is important to remember that each child has an individualized transition plan. The ever changing expectations of kindergarten is what must be considered in the transition for early childhood students. In the conclusion of this paper it is discussed if kindergarten is ready for the needs of the child versus the child being ready for the demands of kindergarten.
Language Development: Communication Strategies in Early Childhood
This starred paper discusses communication strategies in early childhood that support language development both in the home and school settings. First identifying what we know about language development, the stages of language development, and factors that may hinder language development in young children. In reviewing the literature this paper addresses strategies to enhance language development in early childhood. These strategies include; play, routines, adult facilitated interactions, connection between home and school, as well as child directed interactions. Finally, as early childhood special education teachers it is important that we are aware of the different strategies to enhance language development so we can share our knowledge with families of students with disabilities or delayed speech/language skills
Quasinormal modes of the Schwarzchild black hole with a deficit solid angle and quintessence-like matter: Scalar and electromagnetic perturbations
We study the quasinormal modes (QNM) for scalar, and electromagnetic
perturbations in the Schwarzchild black hole with a deficit solid angle and
quintessence-like matter. Using the sixth--order WKB approximation and the
improved asymptotic iteration method (AIM) we can determine the dependence of
the quasinormal modes on the parameters of the black hole and the parameters on
the test fields. The values of the real part and imaginary parts of the
quasi--normal modes increase with the decrease of the values of the deficit
solid angle and density of quintessence-like matter. The quasinormal modes
gotten by these two methods are in good agreement. Using the finite difference
method, we obtain the time evolution profile of such perturbations in this
Black Hole
Effects of quintessence on scattering and absorption sections of black holes
Basing on the ideas used by Kiselev, we study three black holes surrounded by
quintessence and the effects of quintessence on the classical and semiclassical
scattering cross-sections. In contrast, the absorption section is studied with
the sinc approximation in the eikonal limit. For Schwarzschild,
Reissner-Nordstr\"{o}m and Bardeen black holes surrounded by quintessence, the
values critical of charges and the normalization factor are obtained. We also
described the horizons and the extremal condition of the black holes surrounded
by quintessence. By setting for the quintessence state parameter in two the
particular cases w=-2/3 and w=-1/2
Transverse momentum dependence of the angular distribution of the Drell-Yan process
We calculate the transverse momentum Q_{\perp} dependence of the helicity
structure functions for the hadroproduction of a massive pair of leptons with
pair invariant mass Q. These structure functions determine the angular
distribution of the leptons in the pair rest frame. Unphysical behavior in the
region Q_{\perp} --> 0 is seen in the results of calculations done at
fixed-order in QCD perturbation theory. We use current conservation to
demonstrate that the unphysical inverse-power and \ln(Q/Q_{\perp}) logarithmic
divergences in three of the four independent helicity structure functions share
the same origin as the divergent terms in fixed-order calculations of the
angular-integrated cross section. We show that the resummation of these
divergences to all orders in the strong coupling strength \alpha_s can be
reduced to the solved problem of the resummation of the divergences in the
angular-integrated cross section, resulting in well-behaved predictions in the
small Q_{\perp} region. Among other results, we show the resummed part of the
helicity structure functions preserves the Lam-Tung relation between the
longitudinal and double spin-flip structure functions as a function of
Q_{\perp} to all orders in \alpha_s.Comment: 18 pages, 4 figures; typos corrected, references updated, a few
clarifications recommended by the referee. Paper accepted for publication in
Physical Review
Stochastic dynamics of microcavity polaritons
We study the time dependent polariton condensation as well as the parametric
scattering process of polaritons in a semiconductor microcavity. Based upon a
new stochastic scheme the dynamics for both cases is fully analyzed. We show
how the evolution of the system is described by a set of stochastic
differential Schrodinger equations which in average reproduces the exact
dynamics. Furthermore, we underline the role that Coulomb correlations plays in
the polariton dynamics. Threshold behaviors are well captured by the present
approach. The results are in complete agreement with recent experimental
observations.Comment: 6 pages, 8 figures. To appear in Solid State Communication
Effects of polyethylene glycol (PEG) on the corrosion inhibition of mild steel by cerium nitrate in chloride solution
International audienceIn this study, cerium was investigated as an inhibitor to improve the corrosion resistance of ASTM A915 mild steel in 0.1M NaCl solution. Increasing the Ce 3+ concentration up to an optimum level of 600 mg.L-1 (or 1.4 10-3 M) sharply decreased the corrosion rate (Icorr). However, the beneficial effect of cerium was lost after short immersion times at room temperature. In contrast, the addition of polyethylene glycol (PEG) to the cerium nitrate containing NaCl solutions enhanced protection through the formation of stable corrosion products and the decrease of cracks in the film formed on the surface of mild steel
Scattering and absorption sections of Schwarzschild-anti de Sitter with quintessence
In this paper, we study the Schwarzschild-anti de Sitter black hole
surrounded by quintessence. The critical values of the cosmological constant
and the normalization factor are obtained. We described the event horizons and
the extremal condition of the black hole surrounded by quintessence. Also, the
effects of quintessence on the classical and semiclassical scattering
cross-sections have been estimated. The absorption section is studied with the
sinc approximation in the eikonal limit. This study considers the quintessence
state parameter in the particular cases and .Comment: arXiv admin note: substantial text overlap with arXiv:2103.0641
Nested polymerase chain reaction for amplification of the Cryptosporidium oocyst wall protein gene.
We developed a sensitive nested polymerase chain reaction procedure for the Cryptosporidium oocyst wall protein (COWP) gene. Amplification and genotyping were successful in 95.2% of 1,680 fecal samples, 77.6% by the unnested and 17.6% by the nested COWP procedure. The COWP gene was amplified from 2,128 fecal samples: 71 from livestock animals and 2,057 from humans. This series included 706 cases from seven drinking water-associated outbreaks and 51 cases from five swimming pool-associated outbreaks, as well as 1,300 sporadic cases
Geodesics of Hayward black hole surrounded by quintessence
Basing on the ideas used by Kiselev, we study the Hayward black hole
surrounded by quintessence. By setting for the quintessence state parameter at
the special case of , using the metric of the black hole
surrounded by quintessence and the definition of the effective potential, we
analyzed in detail the null geodesics for different energies. We also analyzed
the horizons of the Hayward black hole surrounded by quintessence as well as
the shadow of the black hole
Controlled Irradiative Formation of Penitentes
Spike-shaped structures are produced by light-driven ablation in very
different contexts. Penitentes 1-4 m high are common on Andean glaciers, where
their formation changes glacier dynamics and hydrology. Laser ablation can
produce cones 10-100 microns high with a variety of proposed applications in
materials science. We report the first laboratory generation of
centimeter-scale snow and ice penitentes. Systematically varying conditions
allows identification of the essential parameters controlling the formation of
ablation structures. We demonstrate that penitente initiation and coarsening
requires cold temperatures, so that ablation leads to sublimation rather than
melting. Once penitentes have formed, further growth of height can occur by
melting. The penitentes intially appear as small structures (3 mm high) and
grow by coarsening to 1-5 cm high. Our results are an important step towards
understanding and controlling ablation morphologies.Comment: Accepted for publication in Physical Review Letter
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