15 research outputs found
Promoting Healthy Communities and Reducing Childhood Obesity: Legislative Options
Summarizes legislation proposed or enacted in 2007-08 in the areas of healthy eating and physical activity such as nutrition, physical education, and obesity prevention and treatment, as well as healthy community design and access to healthy food
Promoting Healthy Communities and Preventing Childhood Obesity: Trends in Recent Legislation
Summarizes state legislation enacted in 2009 in the areas of healthy eating and physical activity, such as school nutrition and BMI measurements, and healthy community design and access to healthy food, such as safe routes to school and farmers' markets
Opportunities for Innovation: State Strategies for Groundwater Protection
8 pages.
Contains references
State Legislative Options for Protecting Groundwater Quality
13 pages.
Contains references
State Legislative Options for Protecting Groundwater Quality
13 pages.
Contains references
Coordinated Planning for Water and Land Use: Is It Worth Considering?
10 pages.
Contains 1 page of references
Coordinated Planning for Water and Land Use: Is It Worth Considering?
10 pages.
Contains 1 page of references
Exposure Assessment in the National Childrenâs Study: Introduction
The science of exposure assessment is relatively new and evolving rapidly with the advancement of sophisticated methods for specific measurements at the picogram per gram level or lower in a variety of environmental and biologic matrices. Without this measurement capability, environmental health studies rely on questionnaires or other indirect means as the primary method to assess individual exposures. Although we use indirect methods, they are seldom used as stand-alone tools. Analyses of environmental and biologic samples have allowed us to get more precise data on exposure pathways, from sources to concentrations, to routes, to exposure, to doses. They also often allow a better estimation of the absorbed dose and its relation to potential adverse health outcomes in individuals and in populations. Here, we make note of various environmental agents and how best to assess exposure to them in the National Childrenâs Studyâa longitudinal epidemiologic study of childrenâs health. Criteria for the analytical method of choice are discussed with particular emphasis on the need for long-term quality control and quality assurance measures
Cluster Lensing And Supernova survey with Hubble (CLASH): An Overview
The Cluster Lensing And Supernova survey with Hubble (CLASH) is a 524-orbit
multi-cycle treasury program to use the gravitational lensing properties of 25
galaxy clusters to accurately constrain their mass distributions. The survey,
described in detail in this paper, will definitively establish the degree of
concentration of dark matter in the cluster cores, a key prediction of CDM. The
CLASH cluster sample is larger and less biased than current samples of
space-based imaging studies of clusters to similar depth, as we have minimized
lensing-based selection that favors systems with overly dense cores.
Specifically, twenty CLASH clusters are solely X-ray selected. The X-ray
selected clusters are massive (kT > 5 keV; 5 - 30 x 10^14 M_solar) and, in most
cases, dynamically relaxed. Five additional clusters are included for their
lensing strength (Einstein radii > 35 arcsec at z_source = 2) to further
quantify the lensing bias on concentration, to yield high resolution dark
matter maps, and to optimize the likelihood of finding highly magnified
high-redshift (z > 7) galaxies. The high magnification, in some cases, provides
angular resolutions unobtainable with any current UVOIR facility and can yield
z > 7 candidates bright enough for spectroscopic follow-up. A total of 16
broadband filters, spanning the near-UV to near-IR, are employed for each
20-orbit campaign on each cluster. These data are used to measure precise
(sigma_phz < 0.02(1+z)) photometric redshifts for dozens of newly discovered
multiply-lensed images per cluster. Observations of each cluster are spread
over 8 epochs to enable a search, primarily in the parallel fields, for Type Ia
supernovae at z > 1 to improve constraints on the time dependence of the dark
energy equation of state and the evolution of such supernovae in an epoch when
the universe is matter dominated.Comment: Accepted for publication in the Astrophysical Journal Supplements, 22
pages, 16 figures. Updated Tables 3,4,8 and figures 6 and 8 to reflect
replacement of Abell 963 with Abell 1423 in CLASH survey. A963 cannot be
observed with WFC3 due to the lack of usable guide star