1,634 research outputs found
The Effect of Teacher-Child Interaction Training (TCIT) on Children who are Exhibiting Disruptive Behaviors within the Classroom Setting
The current study examined the impact of Teacher- Child Interaction Training (TCIT) on child behavior, teacher-student relationships, and teacher satisfaction within a general preschool setting utilizing a three-tiered approach. Participants included three preschool children without clinical diagnoses. A single subject nonconcurrent multiple baseline design was utilized across participants. Results suggest that TCIT is effective in reducing disruptive behaviors within the classroom and successful in improving the teacher-student relationship. TCIT is also considered socially valid based on teacher responses, which indicate that the intervention is acceptable and feasible within the general preschool classroom setting
Classification of four-qubit entangled states via Machine Learning
We apply the support vector machine (SVM) algorithm to derive a set of
entanglement witnesses (EW) to identify entanglement patterns in families of
four-qubit states. The effectiveness of SVM for practical EW implementations
stems from the coarse-grained description of families of equivalent entangled
quantum states. The equivalence criteria in our work is based on the stochastic
local operations and classical communication (SLOCC) classification and the
description of the four-qubit entangled Werner states. We numerically verify
that the SVM approach provides an effective tool to address the entanglement
witness problem when the coarse-grained description of a given family state is
available. We also discuss and demonstrate the efficiency of nonlinear kernel
SVM methods as applied to four-qubit entangled state classification.Comment: 10 pages, 8 figure
Multiparticle angular correlations: a probe for the sQGP at RHIC
A novel decomposition technique is used to extract the centrality dependence
of di-jet properties and yields from azimuthal correlation functions obtained
in Au+Au collisions at =200 GeV. The width of the
near-side jet shows very little dependence on centrality. In contrast, the
away-side jet indicates substantial broadening as well as hints for for a local
minimum at for central and mid-central events. The yield of
jet-pairs (per trigger particle) slowly increases with centrality for both the
near- and away-side jets. These observed features are compatible with several
recent theoretical predictions of possible modifications of di-jet
fragmentation by a strongly interacting medium. Several new experimental
approaches, including the study of flavor permutation and higher order
multi-particle correlations, that might help to distinguish between different
theoretical scenarios are discussed.Comment: Proceedings of the MIT workshop on correlations and fluctation
Parton energy loss limits and shadowing in Drell-Yan dimuon production
A precise measurement of the ratios of the Drell-Yan cross section per
nucleon for an 800 GeV/c proton beam incident on Be, Fe and W targets is
reported. The behavior of the Drell-Yan ratios at small target parton momentum
fraction is well described by an existing fit to the shadowing observed in
deep-inelastic scattering. The cross section ratios as a function of the
incident parton momentum fraction set tight limits on the energy loss of quarks
passing through a cold nucleus
Interferometry of Direct Photons in Central 280Pb+208Pb Collisions at 158A GeV
Two-particle correlations of direct photons were measured in central
208Pb+208Pb collisions at 158 AGeV. The invariant interferometric radii were
extracted for 100<K_T<300 MeV/c and compared to radii extracted from charged
pion correlations. The yield of soft direct photons, K_T<300 MeV/c, was
extracted from the correlation strength and compared to theoretical
calculations.Comment: 5 pages, 4 figure
Measurement of Angular Distributions of Drell-Yan Dimuons in Interactions at 800 GeV/c
We report a measurement of the angular distributions of Drell-Yan dimuons
produced using an 800 GeV/c proton beam on a hydrogen target. The polar and
azimuthal angular distribution parameters have been extracted over the
kinematic range GeV/c (excluding the
resonance region), GeV/c, and . The angular
distributions are similar to those of , and both data sets are compared
with models which attribute the distribution either to the
presence of the transverse-momentum-dependent Boer-Mulders structure function
or to QCD effects. The data indicate the presence of both
mechanisms. The validity of the Lam-Tung relation in Drell-Yan is also
tested.Comment: 4 pages, 3 figure
Measurement of Angular Distributions of Drell-Yan Dimuons in p + d Interaction at 800 GeV/c
We report a measurement of the angular distributions of Drell-Yan dimuons
produced using an 800 GeV/c proton beam on a deuterium target. The muon angular
distributions in polar angle and azimuthal angle have been
measured over the kinematic range GeV/c, GeV/c, and . No significant cos dependence is found
in these proton-induced Drell-Yan data, in contrast to the situation for
pion-induced Drell-Yan. The data are compared with expectations from models
which attribute the cos distribution to a QCD vacuum effect or to the
presence of the transverse-momentum-dependent Boer-Mulders structure function
. Constraints on the magnitude of the sea-quark
structure functions are obtained.Comment: 4 pages, 3 figure
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