23,125 research outputs found
A unified model for the long and high jump
A simple model based on the maximum energy that an athlete can produce in a
small time interval is used to describe the high and long jump. Conservation of
angular momentum is used to explain why an athlete should run horizontally to
perform a vertical jump. Our results agree with world records.Comment: Accepted for publication in Am. J. Phy
Iterated function systems, representations, and Hilbert space
This paper studies a general class of Iterated Function Systems (IFS). No
contractivity assumptions are made, other than the existence of some compact
attractor. The possibility of escape to infinity is considered. Our present
approach is based on Hilbert space, and the theory of representations of the
Cuntz algebras O_n, n=2,3,.... While the more traditional approaches to IFS's
start with some equilibrium measure, ours doesn't. Rather, we construct a
Hilbert space directly from a given IFS; and our construction uses instead
families of measures. Starting with a fixed IFS S_n, with n branches, we prove
existence of an associated representation of O_n, and we show that the
representation is universal in a certain sense. We further prove a theorem
about a direct correspondence between a given system S_n, and an associated
sub-representation of the universal representation of O_n.Comment: 22 pages, 3 figures containing 7 EPS graphics; LaTeX2e ("elsart"
document class); v2 reflects change in Comments onl
Edge helicons and repulsion of fundamental edge magnetoplasmons in the quantum Hall regime
A quasi-microscopic treatment of edge magnetoplasmons (EMP) is presented for
very low temperatures and confining potentials smooth on the scale of the
magnetic length but sufficiently steep at the edges such that Landau
level (LL) flattening can be discarded. The profile of the unperturbed electron
density is sharp and the dissipation taken into account comes only from
electron intra-edge and intra-LL transitions due to scattering by acoustic
phonons. For wide channels and filling factors and 2, there exist
independent EMP modes spatially symmetric and antisymmetric with respect to the
edge. Some of these modes, named edge helicons, can propagate nearly undamped
even when the dissipation is strong. Their density profile changes
qualitatively during propagation and is given by a rotation of a complex vector
function. For the Coulomb coupling between the LLs leads to a
repulsion of the uncoupled fundamental LL modes: the new modes have very
different group velocities and are nearly undamped. The theory accounts well
for the experimentally observed plateau structure of the delay times as well as
for the EMP's period and decay rates.Comment: 12 pages, 6 figure
The Evolution from Mentor Texts to Critical Mentor Text Sets
This article chronicles how two teacher educators changed the mentor text set assignment--one component of a larger writing unit plan--from a simple list of texts to a critical mentor text set that includes intentionally selected, culturally and linguistically diverse texts. The goal of the critical mentor text set was to support preservice teachers’ understanding of how to implement culturally sustaining writing pedagogy through developing students’ identities, skills, and intellect as writers, and students’ abilities to read texts through a critical stance that evaluates the privilege and power within the texts while working towards anti-oppression
Men Are from Mars, Women Are from Venus: Evaluation and Modelling of Verbal Associations
We present a quantitative analysis of human word association pairs and study
the types of relations presented in the associations. We put our main focus on
the correlation between response types and respondent characteristics such as
occupation and gender by contrasting syntagmatic and paradigmatic associations.
Finally, we propose a personalised distributed word association model and show
the importance of incorporating demographic factors into the models commonly
used in natural language processing.Comment: AIST 2017 camera-read
Biochar and Nitrogen Effects on Winter Wheat Growth
Biochar, a co-product of thermochemical bioenergy production, may be a valuable soil amendment, but little is known about its potential long-term effects on plant growth and soil fertility. In order to gain more information, this experiment was performed to see if the addition of biochar, in comparison to lime and fertilizer treatments, has the potential to return key nutrients back to the soil or increase crop yield. A field study to investigate the effects of biochar on plant growth was initiated in 2011 near St. John, KS. Treatments included biochar applied at 16.6 ton/a (biochar), lime and annual applications of phosphorus and potassium fertilizer (lime+P&K), and a control. Four rates of nitrogen (N) fertilizer were applied within each treatment (0, 45, 90, and 135 lb N/a). Winter wheat was planted in 2015 and harvested in 2016. The biochar treatment had greater wheat yield and better plant growth than the control but it was similar to the lime+P&K treatment. The greater yields from the biochar and the lime+P&K were likely due to increased soil pH from the lime and biochar. Biochar appears to be an effective method of supplying phosphorus (P), potassium (K), and increasing soil pH, and there was no effect on nitrogen availability
Inhomogeneous broadening of tunneling conductance in double quantum wells
The lineshape of the tunneling conductance in double quantum wells with a
large-scale roughness of heterointerfaces is investigated. Large-scale
variations of coupled energy levels and scattering due to the short-range
potential are taken into account. The interplay between the inhomogeneous
broadening, induced by the non-screened part of large-scale potential, and the
homogeneous broadening due to the scattering by short-range potentials is
considered. It is shown that the large inhomogeneous broadening can be strongly
modified by nonlocal effects involved in the proposed mechanism of
inhomogeneity. Related change of lineshape of the resonant tunneling
conductance between Gaussian and Lorentzian peaks is described. The theoretical
results agree quite well with experimental data.Comment: 11 pages, 5 figure
Simulation of Cosmic Ray neutrinos Interactions in Water
The program CORSIKA, usually used to simulate extensive cosmic ray air
showers, has been adapted to a water medium in order to study the acoustic
detection of ultra high energy neutrinos. Showers in water from incident
protons and from neutrinos have been generated and their properties are
described. The results obtained from CORSIKA are compared to those from other
available simulation programs such as Geant4.Comment: Talk presented on behalf of the ACoRNE Collaboration at the ARENA
Workshop 200
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