Results 111 to 120 of about 465,930 (166)
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On the Spatial Statistics of Optical Flow
International Journal of Computer Vision, 2005We develop a method for learning the spatial statistics of optical flow fields from a novel training database. Training flow fields are constructed using range images of natural scenes and 3D camera motions recovered from handheld and car-mounted video sequences.
Stefan Roth 0001, Michael J. Black
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Spatial Flows and the Regulation of Ecosystems
The American Naturalist, 2004Spatial flows of materials and organisms across ecosystem boundaries are ubiquitous. Understanding the consequences of these flows should be a basic goal of ecosystem science, and yet it has received scant theoretical treatment to date. Here, using a simple, open, nutrient-limited ecosystem model with trophic interactions, we explore theoretically how ...
Michel, Loreau, Robert D, Holt
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Spatial Cluster Detection in Spatial Flow Data
Geographical Analysis, 2016As a typical form of geographical phenomena, spatial flow events have been widely studied in contexts like migration, daily commuting, and information exchange through telecommunication. Studying the spatial pattern of flow data serves to reveal essential information about the underlying process generating the phenomena.
Tao, Ran, Thill, Jean-Claude
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Eliminating Turbulence in Spatially Intermittent Flows
Science, 2010Taming Turbulence When fluid flows through a pipe, if the inertial forces are increased or the viscosity is decreased, the flow will become increasing noisy and will shift from being laminar to turbulent. Turbulence can be triggered by roughness in the pipe or other irregularities, which cause local eddies that grow into full ...
Hof, B +4 more
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Spatial cooperativity in soft glassy flows
Nature, 2008Amorphous glassy materials of diverse nature-concentrated emulsions, granular materials, pastes, molecular glasses-display complex flow properties, intermediate between solid and liquid, which are at the root of their use in many applications. A general feature of such systems, well documented yet not really understood, is the strongly nonlinear nature
Goyon, Julie +4 more
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Spatial Flows and Spatial Patterns
Environment and Planning A: Economy and Space, 1984The misspecification of gravity spatial interaction models has recently been described by the author. The bias in parameter estimates that results from such misspecification appears to produce the ‘map pattern effect’ or ‘spatial structure bias’ in estimated distance-decay parameters.
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Data Flow, Spatial Physical Computing
Proceedings of the Eleventh International Conference on Tangible, Embedded, and Embodied Interaction, 2017Latest hardware improvements on transceivers supporting Low Power Wide Area Networks (LPWAN) make it feasible to connect small battery powered devices hundred of meters or even km away. In this paper, we propose a physical computing paradigm fully exploiting this novel technology. Spatial physical computing (SPC) leverages not only natural manipulation
Álvaro Cassinelli, Daniel Saakes
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Testing for Misspecification in Models of Spatial Flows [PDF]
Environment and Planning A: Economy and Space, 1987 Methods of assessing model fit for models of spatial flows frequently do not take account of spatial structure. A nonparametric test, based on the signs of the residuals from a fit, is presented for detecting patterns in the residuals. It can be thought of as a general test of misspecification that can allow for spatial structure effects.
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A Spatial Analysis of Gravity Flows
Regional Studies, 1972Curry L. (1972) A spatial analysis of gravity flows, Reg. Studies 6, 131–147. Since Wilson gave theoretical substance to the gravity model, it is possible to treat it analytically. His derivation is discussed and calibration problems examined. In particular, the general constraints on the maximum entropy solution he obtains can be particularized.
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Spatial Econometric OD-Flow Models
2013Spatial interaction or gravity models have been used in regional science to model flows that take many forms, for example, population migration, commodity flows, traffic flows, and knowledge flows, all of which reflect movements between origin and destination regions.
LeSage, James P. +1 more
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