6,600 research outputs found
Description of path-in-the-sky contact analog piloting display
A contact analog display called Path-In-The-Sky (PITS) integrates information on airplane attitude, airplane kinematic performance, navigation situation, and path prediction into one instrument. The pictorial format utilized in the PITS display concept was designed to reduce the required instrument scan and to simplify interpretation of informtion with the objective of reducing pilot work load. Described are the symbology of the PITS display, the coordinate systems used to generate the display, and the magnitudes of pertinent geometric characteristics selected during the display development. Also included are examples of the PITS display generated on a stand-alone graphics computer
Climate change impacts on water for irrigated horticulture in the Vale of Evesham. Final Report
This project has undertaken a scoping review and assessment of the impacts of climate change on
irrigated horticulture in the Vale of Evesham, an area of intense irrigated production located within the
Environment Agency’s Warwickshire Avon CAMS Catchment. The research was based on a
combination of methodologies including desk-based review of published and grey literature, computer
agroclimatic and water balance modelling, GIS mapping, meetings with key informants and a
stakeholder workshop.
Future climate datasets were derived from the latest UK Climate Impacts Programme (UKICIP02)
climatology, using selected emission scenarios for the 2020s, 2050s and 2080s. These scenarios were
then used to model and map the future agroclimatic conditions under which agriculture might operate
and the consequent impacts on irrigation need (depths of water applied) and volumetric demand. This
was complimented by a postal survey to abstractors and a stakeholder workshop, to identify, review
and assess farmer adaptation options and responses. The key findings arising from the research,
implications for water resource management and recommendations for further work are summarised
below.
Using a geographical information system (GIS), a series of agroclimate maps have been produced, for
the baseline and selected UKCIP02 scenario. The maps show major changes in agroclimate within the
catchment over the next 50 years. The driest agroclimate zones are currently located around
Worcester, Evesham, Tewkesbury and Gloucester, corresponding to areas where horticultural
production and irrigation demand are most concentrated. By the 2020s, all agroclimate zones are
predicted to increase in aridity. By the 2050s the entire catchment is predicted to have a drier
agroclimate than is currently experienced anywhere in the driest parts of the catchment. This will have
major impacts on the pattern of land use and irrigation water demand. Cont/d
CMB Likelihood Functions for Beginners and Experts
Although the broad outlines of the appropriate pipeline for cosmological
likelihood analysis with CMB data has been known for several years, only
recently have we had to contend with the full, large-scale, computationally
challenging problem involving both highly-correlated noise and extremely large
datasets (). In this talk we concentrate on the beginning and end of
this process. First, we discuss estimating the noise covariance from the data
itself in a rigorous and unbiased way; this is essentially an iterated
minimum-variance mapmaking approach. We also discuss the unbiased determination
of cosmological parameters from estimates of the power spectrum or experimental
bandpowers.Comment: Long-delayed submission. In AIP Conference Proceedings "3K Cosmology"
held in Rome, Oct 5-10, 1998, edited by Luciano Maiani, Francesco Melchiorri
and Nicola Vittorio, 343-347, New York, American Institute of Physics 199
Cosmic Microwave Background Anisotropy Window Functions Revisited
The primary results of most observations of cosmic microwave background (CMB)
anisotropy are estimates of the angular power spectrum averaged through some
broad band, called band-powers. These estimates are in turn what are used to
produce constraints on cosmological parameters due to all CMB observations.
Essential to this estimation of cosmological parameters is the calculation of
the expected band-power for a given experiment, given a theoretical power
spectrum. Here we derive the "band power" window function which should be used
for this calculation, and point out that it is not equivalent to the window
function used to calculate the variance. This important distinction has been
absent from much of the literature: the variance window function is often used
as the band-power window function. We discuss the validity of this assumed
equivalence, the role of window functions for experiments that constrain the
power in {\it multiple} bands, and summarize a prescription for reporting
experimental results. The analysis methods detailed here are applied in a
companion paper to three years of data from the Medium Scale Anisotropy
Measurement.Comment: 5 pages, 1 included .eps figure, PRD in press---final published
versio
The origin of Dendrosenecio within the Senecioneae (Asteraceae) based on chloroplastDNA EVIDENCE
Peer Reviewedhttps://deepblue.lib.umich.edu/bitstream/2027.42/141916/1/ajb213859.pd
Consensual Qualitative Research: An Update
The authors reviewed the application of consensual qualitative research (CQR) in 27 studies published since the method’s introduction to the field in 1997 by C. E. Hill, B. J. Thompson, and E. N. Williams (1997). After first describing the core components and the philosophical underpinnings of CQR, the authors examined how it has been applied in terms of the consensus process, biases, research teams, data collection, data analysis, and writing up the results and discussion sections of articles. On the basis of problems that have arisen in each of these areas, the authors made recommendations for modifications of the method. The authors concluded that CQR is a viable qualitative method and suggest several ideas for research on the method itself
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