6,541 research outputs found
No Small Change: Pension Funds and Corporate Engagement
[Excerpt] At its best corporate engagement offers a long-term view of value that both promotes higher environmental, social, and governance standards and adds share value, thus providing long-term benefits to future pension beneficiaries. At its worst it diverts the attention of pension fund officials from their primary responsibility of ensuring the retirement benefits of their members, and encourages pension funds to usurp the rightful responsibilities of corporate managers. This book examines corporate engagement and its impacts on firms in an effort to see how the potential from this newly emerging force is being realized
Letter from Dr. Michael Hebb, Woodlawn Medical Clinic, to Geraldine Ferraro
Letter from Dr. Michael Hebb, of the Woodlawn Medical Clinic in Canada, to Geraldine Ferraro.https://ir.lawnet.fordham.edu/vice_presidential_campaign_correspondence_1984_international/1370/thumbnail.jp
Storage Capacity of Extremely Diluted Hopfield Model
The storage capacity of the extremely diluted Hopfield Model is studied by
using Monte Carlo techniques. In this work, instead of diluting the synapses
according to a given distribution, the dilution of the synapses is obtained
systematically by retaining only the synapses with dominant contributions. It
is observed that by using the prescribed dilution method the critical storage
capacity of the system increases with decreasing number of synapses per neuron
reaching almost the value obtained from mean-field calculations. It is also
shown that the increase of the storage capacity of the diluted system depends
on the storage capacity of the fully connected Hopfield Model and the fraction
of the diluted synapses.Comment: Latex, 14 pages, 4 eps figure
The role of community partners in urban investments
Institutional investors seeking to deploy capital to underserved areas do not have either the time or the expertise to actively manage these specialized investments. Investment vehicles intervene by using their financial expertise to pool assets and lower transaction costs. Community partners, in turn, link the investment vehicle to the neighborhood. This paper develops a typology of community partners and their unique characteristics that enable them to overcome information asymmetries in certain markets. The paper also discusses the business models that establish the relationship between the investment vehicle and community partner to highlight strengths of the different models for delivering community transformation.Community development
Detecting Differential Rotation and Starspot Evolution on the M dwarf GJ 1243 with Kepler
We present an analysis of the starspots on the active M4 dwarf GJ 1243, using
four years of time series photometry from Kepler. A rapid day rotation period is measured due to the 2.2\%
starspot-induced flux modulations in the light curve. We first use a light
curve modeling approach, using a Monte Carlo Markov Chain sampler to solve for
the longitudes and radii of the two spots within 5-day windows of data. Within
each window of time the starspots are assumed to be unchanging. Only a weak
constraint on the starspot latitudes can be implied from our modeling. The
primary spot is found to be very stable over many years. A secondary spot
feature is present in three portions of the light curve, decays on 100-500 day
timescales, and moves in longitude over time. We interpret this longitude
shearing as the signature of differential rotation. Using our models we measure
an average shear between the starspots of 0.0047 rad day, which
corresponds to a differential rotation rate of
rad day. We also fit this starspot phase evolution using a series of
bivariate Gaussian functions, which provides a consistent shear measurement.
This is among the slowest differential rotation shear measurements yet measured
for a star in this temperature regime, and provides an important constraint for
dynamo models of low mass stars.Comment: 13 pages, 7 figures, ApJ Accepte
Investment intermediaries in economic development: Linking public pension funds to urban revitalization
It is difficult for large investors, such as pension funds, to make investments in EDMs because they must make very large investments. The investments in communities of need, however, are usually small. The most successful strategy to overcome these two problems is for investors to work in concert with intermediaries that can aggregate the investments and community partners that understand both the need of communities and know how to tell âthe storyâ to investors.
An Improved Method for Estimating the Masses of Stars with Transiting Planets
To determine the physical parameters of a transiting planet and its host star
from photometric and spectroscopic analysis, it is essential to independently
measure the stellar mass. This is often achieved by the use of evolutionary
tracks and isochrones, but the mass result is only as reliable as the models
used. The recent paper by Torres et al (2009) showed that accurate values for
stellar masses and radii could be obtained from a calibration using T_eff, log
g and [Fe/H]. We investigate whether a similarly good calibration can be
obtained by substituting log rho - the fundamental parameter measured for the
host star of a transiting planet - for log g, and apply this to star-exoplanet
systems. We perform a polynomial fit to stellar binary data provided in Torres
et al (2009) to obtain the stellar mass and radius as functions of T_eff, log
rho and [Fe/H], with uncertainties on the fit produced from a Monte Carlo
analysis. We apply the resulting equations to measurements for seventeen
SuperWASP host stars, and also demonstrate the application of the calibration
in a Markov Chain Monte Carlo analysis to obtain accurate system parameters
where spectroscopic estimates of effective stellar temperature and metallicity
are available. We show that the calibration using log rho produces accurate
values for the stellar masses and radii; we obtain masses and radii of the
SuperWASP stars in good agreement with isochrone analysis results. We ascertain
that the mass calibration is robust against uncertainties resulting from poor
photometry, although a good estimate of stellar radius requires good-quality
transit light curve to determine the duration of ingress and egress.Comment: 5 pages, 2 figures, accepted for publication in A&
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