2,015 research outputs found
Recommended from our members
Study of Pupil Personnel Ratios, Services, and Programs in California
Gray, Elsner, and Poynton present a brief overview and analysis of Assembly Bill 722. The authors provide a summary of the key components of the study including the need for pupil support services, effective pupil support services and programs, and ratios of pupil-to-pupil support personnel. They offer an additional analysis of implications for future practice, including a critique of the reported effectiveness of the pupil programs, but lack of access for most students given the high pupil to personnel ratio
Peri-abelian categories and the universal central extension condition
We study the relation between Bourn's notion of peri-abelian category and
conditions involving the coincidence of the Smith, Huq and Higgins commutators.
In particular we show that a semi-abelian category is peri-abelian if and only
if for each normal subobject , the Higgins commutator of with
itself coincides with the normalisation of the Smith commutator of the
denormalisation of with itself. We show that if a category is peri-abelian,
then the condition (UCE), which was introduced and studied by Casas and the
second author, holds for that category. In addition we show, using amongst
other things a result by Cigoli, that all categories of interest in the sense
of Orzech are peri-abelian and therefore satisfy the condition (UCE).Comment: 14 pages, final version accepted for publicatio
van der Waals dispersion power laws for cleavage, exfoliation and stretching in multi-scale, layered systems
Layered and nanotubular systems that are metallic or graphitic are known to
exhibit unusual dispersive van der Waals (vdW) power laws under some
circumstances. In this letter we investigate the vdW power laws of bulk and
finite layered systems and their interactions with other layered systems and
atoms in the electromagnetically non-retarded case. The investigation reveals
substantial difference between `cleavage' and `exfoliation' of graphite and
metals where cleavage obeys a vdW power law while exfoliation
obeys a law for graphitics and a
law for layered metals. This leads to questions of relevance in the
interpretation of experimental results for these systems which have previously
assumed more trival differences. Furthermore we gather further insight into the
effect of scale on the vdW power laws of systems that simultaneously exhibit
macroscopic and nanoscopic dimensions. We show that, for metallic and graphitic
layered systems, the known "unusual" power laws can be reduced to standard or
near standard power laws when the effective scale of one or more dimension is
changed. This allows better identification of the systems for which the
commonly employed `sum of ' type vdW methods might be valid such as
layered bulk to layered bulk and layered bulk to atom
Junior Recital: Tim Gray, Euphonium
Kemp Recital Hall Saturday Morning April 29, 1995 11:00a.m
Employment Discrimination: Summary Judgment and Rule 301 after St. Mary\u27s Honor Center v. Hicks
Note
Senior Recital:Tim Gray, Euphonium Patricia Foltz, Piano
Kemp Recital Hall Sunday Afternoon April 20, 1997 3:00p.m
On the normality of Higgins commutators
In a semi-abelian context, we study the condition (NH) asking that Higgins
commutators of normal subobjects are normal subobjects. We provide examples of
categories that do or do not satisfy this property. We focus on the
relationship with the "Smith is Huq" condition (SH) and characterise those
semi-abelian categories in which both (NH) and (SH) hold in terms of reflection
and preservation properties of the change of base functors of the fibration of
points.Comment: 15 pages; final published versio
CINECITY The Brighton Film Festival 2013 - 2017
An ediiton of CINECITY The Brighton Film Festival is presented annually.
Industry and curatorial research - and raising public funding - across the year results in the final programme of activity
UTSim2 validation
The Center for NDE (CNDE) at Iowa State University has a long history of developing physics models for NDE and packaging these models into simulation tools which make the modeling capabilities accessible to CNDEs industrial sponsors. Recent work at CNDE has led to the development of a new ultrasonic simulation package, UTSim2, which aims to continue this tradition of supporting industrial application of CNDE models. In order to meet this goal, UTSim2 has been designed as an extensible software package which can support previously-developed physics models as well as future models yet to be developed. Initial work has focused on the implementation of a Gauss-Hermite beam model, a paraxial approximation, which is implemented as part of the Thompson-Gray measurement model. This paper will present recent validation results and include comparisons against both previously-validated model output and newly-performed experiments
- …