3,456 research outputs found
The University of Alaska Anchorage experience
In the fall 2005, when two faculty librarians
at the University of Alaska Anchorage’s
(UAA) Consortium Library realized that three
people on the library staff were enrolled in
library school, they saw the perfect opportunity
to start a discussion group that would
benefit both currently employed librarians
and students entering the information field.
The original three students were enrolled
in the MLIS distance program at the University
of Washington, working in the Consortium
Library, and taking classes part-time. The
two faculty librarians had been out of library
school for more than ten years by then, so
the intent was to organize a forum with an
informal, relaxed atmosphere that would
be an engaging way to keep up with current
curricula, to learn about class projects
the students were working on, and to hear
about their experiences. While the librarians
learned from the students, the students could,
in turn, share their new expertise with the
library faculty.
That was the beginning of what came
to be known as FLIP: Future Library and
Information Science People.1 Now, nearly
seven years later, FLIP is still going strong.
What the name stands for has changed
slightly—to Future Librarians and Information
Professionals—and the membership has
expanded to include anyone considering a
career as a librarian or enrolling in an MLS
or MLIS program. Characterizing FLIP as a
“mentoring” program misses the mark, since
so much more than just mentoring is happening.
Because the benefits go both ways, we
prefer the term “un-mentoring” to describe
FLIP. Regardless of its definition or description,
however, the original purpose remains
the same: to provide an informal discussion
forum that enriches library school studies
with librarian expertise, advice, and insight
Measuring time preferences
We review research that measures time preferences—i.e., preferences over intertemporal tradeoffs. We distinguish between studies using financial flows, which we call “money earlier or later” (MEL) decisions and studies that use time-dated consumption/effort. Under different structural models, we show how to translate what MEL experiments directly measure (required rates of return for financial flows) into a discount function over utils. We summarize empirical regularities found in MEL studies and the predictive power of those studies. We explain why MEL choices are driven in part by some factors that are distinct from underlying time preferences.National Institutes of Health (NIA R01AG021650 and P01AG005842) and the Pershing Square Fund for Research in the Foundations of Human Behavior
Pion Scalar Density and Chiral Symmetry Restoration at Finite Temperature and Density
This paper is devoted to the evaluation of the pionic scalar density at
finite temperature and baryonic density. We express the latter effect in terms
of the nuclear response evaluated in the random phase approxima- tion. We
discuss the density and temperature evolution of the pionic density which
governs the quark condensate evolution. Numerical evalua- tions are performed.Comment: 13 pages, Latex File, 10 eps Figure
Chiral Dynamics of Deeply Bound Pionic Atoms
We present and discuss a systematic calculation, based on two-loop chiral
perturbation theory, of the pion-nuclear s-wave optical potential. A proper
treatment of the explicit energy dependence of the off-shell pion self-energy
together with (electromagnetic) gauge invariance of the Klein-Gordon equation
turns out to be crucial. Accurate data for the binding energies and widths of
the 1s and 2p levels in pionic ^{205}Pb and ^{207}Pb are well reproduced, and
the notorious "missing repulsion" in the pion-nuclear s-wave optical potential
is accounted for. The connection with the in-medium change of the pion decay
constant is clarified.Comment: preprint ECT*-02-16, 4 pages, 3 figure
Gas Content, Size, Temperature and Velocity Effects on Cavitation Inception Internal Report No. 31
Gas content, size temperature, and velocity effects on Venturi cavity inceptio
Evaluation of the scattering amplitude in the -channel at finite density
The scattering amplitude in the -channel is studied at
finite baryonic density in the framework of a chiral unitary approach which
successfully reproduces the meson meson phase shifts and generates the
and resonances in vacuum. We address here a new variety of mechanisms
recently suggested to modify the interaction in the medium, as well as
the role of the wave selfenergy, in addition to the wave, in the
dressing of the pion propagators.Comment: 26 pages, 17 figure
Quantum Mechanics of Extended Objects
We propose a quantum mechanics of extended objects that accounts for the
finite extent of a particle defined via its Compton wavelength. The Hilbert
space representation theory of such a quantum mechanics is presented and this
representation is used to demonstrate the quantization of spacetime. The
quantum mechanics of extended objects is then applied to two paradigm examples,
namely, the fuzzy (extended object) harmonic oscillator and the Yukawa
potential. In the second example, we theoretically predict the phenomenological
coupling constant of the meson, which mediates the short range and
repulsive nucleon force, as well as the repulsive core radius.Comment: RevTex, 24 pages, 1 eps and 5 ps figures, format change
Unusual statistics of interference effects in neutron scattering from compound nuclei
We consider interference effects between p-wave resonance scattering
amplitude and background s-wave amplitude in low-energy neutron scattering from
a heavy nucleus which goes through the compound nucleus stage. The first effect
is in the difference between the forward and backward scattering cross
sections. Because of the chaotic nature of the compound states, this effect is
a random variable with zero mean. However, a statistical consideration shows
that the probability distribution of this effect does not obey the standard
central limit theorem. That is, the probability density for the effect averaged
over n resonances does not become a Gaussian distribution with the variance
decreasing as 1/sqrt(n) (``violation'' of the theorem!). We derive the
probability distribution of the effect and the limit distribution of the
average. It is found that the width of this distribution does not decrease with
the increase of n, i.e., fluctuations are not suppressed by averaging.
Furthermore, we consider the correlation between the neutron spin and the
scattering plane and find that this effect, although much smaller, shows
fluctuations which actually increase upon averaging over many measurements.
Limits of the effects due to finite resonance widths are also considered. In
the appendix we present a simple derivation of the limit theorem for the
average of random variables with infinite variances.Comment: 15 pages, RevTeX, submitted to Phys. Rev.
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