44,235 research outputs found
Implicit amenity prices and the location of retirees in England and Wales
General equilibrium models in which compensation for local amenities occurs in both housing and labour markets have been widely used to generate implicit amenity prices and regional quality of life indices. An implication and prospective test of such models is that individuals who are outside the labour market have an incentive to locate in regions where amenities are capitalised into wages. In this paper we construct a measure of the extent of amenity capitalisation into wages for each county in England and Wales. We then test the multimarket amenity model by applying this measure to county-level data on the location of retirees. Our results provide strong support for the mode
Implicit amenity prices and the location of retirees in England and Wales
General equilibrium models in which compensation for local amenities occurs in both housing and labour markets have been widely used to generate implicit amenity prices and regional quality of life indices. An implication and prospective test of such models is that individuals who are outside the labour market have an incentive to locate in regions where amenities are capitalised into wages. In this paper we construct a measure of the extent of amenity capitalisation into wages for each county in England and Wales. We then test the multimarket amenity model by applying this measure to county-level data on the location of retirees. Our results provide strong support for the model
A Compilation of the Property Differences of Ortho and Para Hydrogen or Mixtures of Ortho and Para Hydrogen
Chemical and physical properties of ortho and para hydrogen or mixtures of ortho and para hydroge
ROSAT observations of two 'cooling flow' EMSS Galaxies
We present ROSAT observations of two luminous L~10^44 erg/s EMSS galaxies,
MS1019+5139 and MS1209+3917, previously classified as 'cooling flow' galaxies.
MS1019+5139 does not appear to be spatially extended (<13 kpc) while its
spectrum is well fit by a power law with Gamma = 1.73 +0.19-0.18; X-ray
variability on a timescale of ~ years is also clearly detected. MS1209+3917
shows no evidence of spatial extension (<50 kpc) but it shows variability,
while its spectrum can be fit with thermal bremsstrahlung emission (kT=1.8
+0.9-0.4 keV) or a power law model (Gamma = 2.50 +0.44-0.42, but with excess
photoelectric absorption above the Galactic value). All the above argue against
thermal emission from a group of galaxies or a galaxy but in favour of an AGN
(possibly BL Lac) interpretation. We conclude that no 'normal' galaxies with
high X-ray luminosities have yet been detected in the EMSS survey that could be
significant contributors to the X-ray background.Comment: 6 pages, LaTeX, 6 postscript figures included, to appear in MNRA
On the arcmin structure of the X-ray Universe
We present the angular correlation function of the X-ray population of 1063
XMM-Newton observations at high Galactic latitudes, comprising up to ~30000
sources over a sky area of ~125 sq. degrees in the energy bands: soft (0.5-2
keV) and hard (2-10 keV). This is the largest sample of serendipitous X-ray
sources ever used for clustering analysis purposes to date and the results have
been determined with unprecedented accuracy. We detect significant clustering
signals in the soft and hard bands (~10 sigma and ~5 sigma, respectively). We
deproject the angular correlation function via Limber's equation and calculate
the typical spatial lengths. We infer that AGN at redshifts ~1 are embedded in
dark matter halos with typical masses of log M ~ 12.6/h Msol and lifetimes in
the range ~3-5 x 10^8 years, which indicates that AGN activity is a transient
phase in the life of galaxies.Comment: 4 pages, 1 figure. Proc. of the conference "X-ray Astronomy 2009:
Present status, multiwavelength approach and future perspectives", September
2009, Bologna. To appear in AIP Conf. Proc. (editors: A. Comastri, M. Cappi,
L. Angelini)
Automatic holographic droplet analysis for liquid fuel sprays
The basic scheme for automated holographic analysis involves an optical system for reconstruction of the three dimensional real image of the droplet field, a spatial scanning system to transport a digitizing X-y image sensor through the real image, and processing algorithms for droplet recognition which establish the droplet sizes and positions. The hardware for system demonstrated includes the expanded and collimated beam from a 5 mW helium-neon laser for hologram reconstruction, an imaging lens for magnification of the real image field, and a video camera and digitizer providing 512-by-512 pixel resolution with 8-bit digitization. A mechanical stage is used to scan the hologram in three dimensional space, maintaining constant image magnification. A test droplet hologram is used for development and testing of the image processing algorithms
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