Object correlation and maneuver detection are persistent problems in space surveillance and space object catalog maintenance. This paper demonstrates the utility of using quadratic trajectory control cost, an analog to the trajectory L2-norm in control, as a distance metric with which to both correlate object tracks and detect maneuvers using Uncorrelated Tracks (UCTs), real-time sensor measure...

*This research was supported by the U.S. Department of Energy under Contract No. DE-AC02-76CH00016. Experiments which are planned for the Superconducting Super Collider and the Relativistic Heavy Ion Collider will involve interactions in which detectors will need to identify and localize hundreds or even thousands of particle tracks simultaneously. Most types of conventional position sensitive,...

the main design criteria of ballasted railway tracks include rail deflections, rail bending stresses, rail wheel contact stresses, sleeper bending moments and ballast sleeper contact pressures. numerous criteria have been defined for the design of ballasted railway tracks owing to the various mechanical properties of track components and their complex interaction. therefore, railway track desig...

1. introduction mountain regions are increasingly endangered by a variety of disaster, including avalanche, debris flows, and rock slide. some characteristics such as elevation, angle of slope, vegetation and climatic elements could affect the avalanche event. indeed, avalanche is the second factor in soil erosion that causes demolition; therefore, it threatens the food safety. iran has two mai...

The maximum impact of oil on bird fauna was recorded at the beaches of Clifton where Tasman Spirit Oil Spill (TSOS) took place. After the disaster, its crude oil spread over the feeding grounds of birds. The low bird diversity at Clifton was recorded. Most adverse effects were observed along the beaches of Clifton, Sea View and adjoining areas. Concentrations of polycyclic Aromatic Hydrocarbons...

Snow avalanches are a significant natural hazard representing the primary risk of death to backcountry travelers in many alpine countries. Careful use terrain through effective decision making can mitigate dangerous snowpack conditions, but requires relevant knowledge and experience. We present results from large-scale crowd sourced data collection method users. Using GPS tracking via smartphon...

The main design criteria of ballasted railway tracks include rail deflections, rail bending stresses, rail wheel contact stresses, sleeper bending moments and ballast sleeper contact pressures. Numerous criteria have been defined for the design of ballasted railway tracks owing to the various mechanical properties of track components and their complex interaction. Therefore, railway track desig...

in this paper, we calculate electron and hole impactionization coefficients in in0.52al0.48as using a monte carlo modelwhich has two valleys and two bands for electrons and holesrespectively. also, we calculate multiplication factor for electronand hole initiated multiplication regimes and breakdown voltagein in0.52al0.48as pin avalanche photodiodes. to validate themodel, we compare our simulat...

A major ice collapse (10,000 ) from a hanging glacier on Mount Eiger, Switzerland was recorded by small aperture array as broadband (0.1–10 Hz) infrasound signal. Array analysis reveals that the high (3 frequency signal is produced moving mass, and its back azimuth variation with time tracks mass trajectory provides mean velocity estimate. Infrasound used to estimate radius, despite overestimat...