ABSTRACT. This paper presents a descriptive analysis of spatial trends in six U.S. metropolitan areas. The results show that generalized job dispersion was a more common spatial process than subcentering during the 1980s and 1990s when jobs continued to decentralize from the metropolitan core to the suburbs. Three distinctive patterns of spatial development were found. Job dispersion was predom...

Refractive index dispersion is an intrinsic optical property and a useful source of contrast in biological imaging studies. In this report, we present the first dispersion phase imaging of living eukaryotic cells. We have developed quantitative dispersion microscopy based on the principle of quantitative phase microscopy. The dual-wavelength quantitative phase microscope makes phase measurement...

The finite temperature Casimir free energy is calculated for a dielec-tric ball of radius a embedded in an infinite medium. The condition ǫµ = 1 is assumed for the inside/outside regions. Both the Green function method and the mode summation method are considered, and found to be equivalent. For a dilute medium we find, assuming a simple " square " dispersion relation with an abrupt cutoff at i...

The effect of a constant applied external force, induced for instance by an electric or gravitational field, on the dispersion of Brownian particles in periodic media with spatially varying diffusivity, and thus mobility, is studied. We show that external forces can greatly enhance dispersion in the direction of the applied force and also modify, to a lesser extent and in some cases nonmonotoni...

Visualization of disaster dispersion prediction enables decision makers and civilian to prepare disaster and to reduce the damage by showing the realistic simulation results. With advances of GIS technology and the theory of volcanic disaster prediction algorithm, the predicted disaster dispersions are displayed in spatial information. However, most of volcanic ash dispersion predictions are di...

how to cite this article: movahedian ah, heidarzadeh arani m, motaharizad m, mousavi gha, mosayebi z. evaluation of qt dispersion in children with breath holding spells. iran j child neurol. winter 2016; 10(1):25-30. abstract objective breath holding spells (bhs) are common involuntary reflexes in infancy and early childhood. differential diagnosis should embrace long qt syndrome (lqts) and par...

Numerical dispersion in finite difference modeling produces coherent artifacts, severely constraining the resolution of advanced imaging and inversion schemes. Conventionally, we deal with this by increasing the order of accuracy of the finite difference operators and resign ourselves to paying the high computational cost that incurs. But is there a way to reduce such dispersion without increas...

Although slow conduction is a requirement for the preparation of sustained reentry, it alone is not sufficient for the initiation of reentry. Additionally, unidirectional block and recovery of excitability distal to the site of block must occur. Thus, a comprehensive description of the electrophysiological determinants of reentry must explain both slow conduction and unidirectional block. Altho...

There are several alternative hypotheses about the effects of territoriality, kinship and prey availability on individual carnivore distributions within populations. The first is the land-tenure hypothesis, which predicts that carnivores regulate their density through territoriality and temporal avoidance. The second is the kinship hypothesis, which predicts related individuals will be clumped ...

The world coordinate systems for dispersion calibrated spectra used in the IRAF/NOAO spectroscopy packages are presented. In particular, the image header keywords which deene the coordinates. These keywords appear both as part of the IRAF image structure and map directly to FITS format. The types of spectra include multidimensional images with one or more spatial axes and a linear or log-linear...