2,151 research outputs found
Conceptualizing a Model for Teacher Team Learning: The Promise of Integration of Diversity of Perspectives During Team Learning
Many studies have emphasized that the integration of divergent perspectives is the central to teacher team learning, but it is difficult for teacher teams. This is because it is necessary to consider the multi-layers of team learning to foster the integration. However, existing research has focused only on a unidimensional aspect. Therefore, we conceptualize a comprehensive theoretical model for teacher team learning with focus on integration of perspective by incorporating multiple aspects, including (a) not only the cognitive dimension, but also the affective, relational and motivational dimensions and (b) not only a team level, but also a system (organizational) level
Holography for fermions
The holographic interpretation is a useful tool to describe 5D field theories
in a 4D language. In particular it allows one to relate 5D AdS theories with 4D
CFTs. We elaborate on the 5D/4D dictionary for the case of fermions in AdS
with boundaries. This dictionary is quite useful to address phenomenological
issues in a very simple manner, as we show by giving some examples.Comment: 22 pages, 2 figures; v2: minor corrections, references adde
Explicit Supersymmetry Breaking on Boundaries of Warped Extra Dimensions
Explicit supersymmetry breaking is studied in higher dimensional theories by
having boundaries respect only a subgroup of the bulk symmetry. If the boundary
symmetry is the maximal subgroup allowed by the boundary conditions imposed on
the fields, then the symmetry can be consistently gauged; otherwise gauging
leads to an inconsistent theory. In a warped fifth dimension, an explicit
breaking of all bulk supersymmetries by the boundaries is found to be
inconsistent with gauging; unlike the case of flat 5D, complete supersymmetry
breaking by boundary conditions is not consistent with supergravity. Despite
this result, the low energy effective theory resulting from boundary
supersymmetry breaking becomes consistent in the limit where gravity decouples,
and such models are explored in the hope that some way of successfully
incorporating gravity can be found. A warped constrained standard model leads
to a theory with one Higgs boson with mass expected close to the experimental
limit. A unified theory in a warped fifth dimension is studied with boundary
breaking of both SU(5) gauge symmetry and supersymmetry. The usual
supersymmetric prediction for gauge coupling unification holds even though the
TeV spectrum is quite unlike the MSSM. Such a theory may unify matter and Higgs
in the same SU(5) hypermultiplet.Comment: 30 pages, version to appear in Nucl. Phys.
Tools for Deconstructing Gauge Theories in AdS5
We employ analytical methods to study deconstruction of 5D gauge theories in
the AdS5 background. We demonstrate that using the so-called q-Bessel functions
allows a quantitative analysis of the deconstructed setup. Our study clarifies
the relation of deconstruction with 5D warped theories.Comment: 30 pages; v2: several refinements, references adde
Evidence-Based Multifactorial Assessment of Preschool-Age Children Who Stutter.
This review summarizes extant findings supporting multifactorial models of stuttering within the context of preschool-age stuttering assessment. Evidence is given for a number of speech-language and associated factors/domains to consider when evaluating young children who stutter. Selected factors are presented in two parts: (1) Caregiver Interview and (2) Direct Child Assessment. Factors addressed during caregiver interviews include: gender, time since and age at stuttering onset, family history of stuttering, caregivers’ perception/concerns about stuttering, and temperament. Factors addressed during direct child assessments include: stuttering behaviors, speech-associated attitudes/awareness, speech rate, as well as speech sound and language development. Interactions/relations among factors are noted, showing their combined effects and contributions to childhood stuttering. Additionally, suggested clinical applications are provided wherever appropriate. Such evidence and practical applications bridge the gap between theory and clinical practice, thus advancing the abilities of speech-language pathologists to conduct well-informed, comprehensive stuttering evaluations
Gauge coupling renormalization in RS1
We compute the 4D low energy effective gauge coupling at one-loop order in
the compact Randall-Sundrum scenario with bulk gauge fields and charged matter,
within controlled approximations. While such computations are subtle, they can
be important for studying phenomenological issues such as grand unification.
Ultraviolet divergences are cut-off using Pauli-Villars regularization so as to
respect 5D gauge and general coordinate invariance. The structure of these
divergences on branes and in the bulk is elucidated by a 5D position-space
analysis. The remaining finite contributions are obtained by a careful analysis
of the Kaluza-Klein spectrum. We comment on the agreement between our results
and expectations based on the AdS/CFT correspondence, in particular logarithmic
sensitivity to the 4D Planck scale.Comment: 17 pages, Latex2e, uses axodraw.sty, new references added. To be
published in Nucl. Phys.
Structural Studies of Wnts and Identification of an LRP6 Binding Site
SummaryWnts are secreted growth factors that have critical roles in cell fate determination and stem cell renewal. The Wnt/β-catenin pathway is initiated by binding of a Wnt protein to a Frizzled (Fzd) receptor and a coreceptor, LDL receptor-related protein 5 or 6 (LRP5/6). We report the 2.1 Å resolution crystal structure of a Drosophila WntD fragment encompassing the N-terminal domain and the linker that connects it to the C-terminal domain. Differences in the structures of WntD and Xenopus Wnt8, including the positions of a receptor-binding β hairpin and a large solvent-filled cavity in the helical core, indicate conformational plasticity in the N-terminal domain that may be important for Wnt-Frizzled specificity. Structure-based mutational analysis of mouse Wnt3a shows that the linker between the N- and C-terminal domains is required for LRP6 binding. These findings provide important insights into Wnt function and evolution
Systematics of Coupling Flows in AdS Backgrounds
We give an effective field theory derivation, based on the running of Planck
brane gauge correlators, of the large logarithms that arise in the predictions
for low energy gauge couplings in compactified AdS}_5 backgrounds, including
the one-loop effects of bulk scalars, fermions, and gauge bosons. In contrast
to the case of charged scalars coupled to Abelian gauge fields that has been
considered previously in the literature, the one-loop corrections are not
dominated by a single 4D Kaluza-Klein mode. Nevertheless, in the case of gauge
field loops, the amplitudes can be reorganized into a leading logarithmic
contribution that is identical to the running in 4D non-Abelian gauge theory,
and a term which is not logarithmically enhanced and is analogous to a two-loop
effect in 4D. In a warped GUT model broken by the Higgs mechanism in the
bulk,we show that the matching scale that appears in the large logarithms
induced by the non-Abelian gauge fields is m_{XY}^2/k where m_{XY} is the bulk
mass of the XY bosons and k is the AdS curvature. This is in contrast to the UV
scale in the logarithmic contributions of scalars, which is simply the bulk
mass m. Our results are summarized in a set of simple rules that can be applied
to compute the leading logarithmic predictions for coupling constant relations
within a given warped GUT model. We present results for both bulk Higgs and
boundary breaking of the GUT gauge group.Comment: 22 pages, LaTeX, 3 figures. Comments and references adde
Expressed parental concern regarding childhood stuttering and the Test of Childhood Stuttering
Purpose—The purpose of the present study was to determine whether the Test of Childhood Stuttering observational rating scales (TOCS; Gillam, Logan & Pearson, 2009) (1) differed between parents who did versus did not express concern (independent from the TOCS) about their child’s speech fluency; (2) correlated with children’s frequency of stuttering measured during a child-examiner conversation; and (3) correlated with the length and complexity of children’s utterances, as indexed by mean length of utterance (MLU).
Method—Participants were 183 young children ages 3:0 to 5:11. Ninety-one had parents who reported concern about their child’s stuttering (65 boys, 26 girls) and 92 had parents who reported no such concern (50 boys, 42 girls). Participants’ conversational speech during a child-examiner conversation was analyzed for (a) frequency of occurrence of stuttered and non-stuttered disfluencies, and (b) MLU. Besides expressing concern or lack thereof about their child’s speech fluency, parents completed the TOCS observational rating scales documenting how often they observe different disfluency types in speech of their children, as well as disfluency-related consequences.
Results—There were three main findings. First, parents who expressed concern (independently from the TOCS) about their child’s stuttering reported significantly higher scores on the TOCS Speech Fluency and Disfluency-Related Consequences rating scales. Second, children whose parents rated them higher on the TOCS Speech Fluency rating scale produced more stuttered disfluencies during a child-examiner conversation. Third, children with higher scores on the TOCS Disfluency-Related Consequences rating scale had shorter MLU during child-examiner conversation, across age and level of language ability.
Conclusions—Findings support the use of the TOCS observational rating scales as one documentable, objective means to determine parental perception of and concern about their child’s stuttering. Findings also support the notion that parents are reasonably accurate, if not reliable, judges of the quantity and quality (i.e., stuttered vs. non-stuttered) of their child’s speech disfluencies. Lastly, findings that some children may decrease their verbal output in attempts to minimize instances of stuttering – as indexed by relatively low MLU and a high TOCS Disfluency-Related Consequences scores - provides strong support for sampling young children’s speech and language across various situations to obtain the most representative index possible of the child’s MLU and associated instances of stuttering.
· Tumanova, V., Choi. D., Conture, E., & Walden, T. (2018). Expressed parental concern regarding childhood stuttering and the Test of Childhood Stuttering. Journal of Communication Disorders, 72, 86-96, doi: 10.1016/j.jcomdis.2018.01.00
Grand Unification in RS1
We study unification in the Randall-Sundrum scenario for solving the
hierarchy problem, with gauge fields and fermions in the bulk. We calculate the
one-loop corrected low-energy effective gauge couplings in a unified theory,
broken at the scale M_GUT in the bulk. We find that, although this scenario has
an extra dimension, there is a robust (calculable in the effective field
theory) logarithmic dependence on M_GUT, strongly suggestive of high-scale
unification, very much as in the (4D) Standard Model. Moreover, bulk threshold
effects are naturally small, but volume-enhanced, so that we can accommodate
the measured gauge couplings. We show in detail how excessive proton decay is
forbidden by an extra U(1) bulk gauge symmetry. This mechanism requires us to
further break the unified group using boundary conditions. A 4D dual
interpretation, in the sense of the AdS/CFT correspondence, is provided for all
our results. Our results show that an attractive unification mechanism can
combine with a non-supersymmetric solution to the hierarchy problem.Comment: Latex, 23 pages. In the revised version, Eq. (3.3) has been modified
with no change in the central result of the paper and a reference has been
adde
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