... Descriptors : *CATALOGS, *POSITION(LOCATION), *RADIO SOURCES( ASTRONOMY), *MOTION, *STARS, ERRORS, TELESCOPES ...

... Title : Determination of the Best Ground Penetrating Radar Source Signal Type for the Accurate Location of Underground Utilities. ...

Because COMPTEL has a wide field of view (though not as wide as BATSE) and can accurately locate gamma ray sources, one of its primary functions will be to ...

into one end of the cable and relies on the pulse being reflected back to the source due to an electrical discontinuity at the faulted location. The fault ...

... CT-Analyst is visual, ie, �point-and- click,� in application and deployable ... Analyst to backtrack to an unknown source location (purple diamond region ...

The source mechanism of earthquakes in the California-Nevada region was studied using surface wave analyses, surface displacement observations in the source region, magnitude determinations, and accurate epicenter locations. These data together with the G...

A technique has been developed to obtain selected source parameters for a release of toxic material into the atmosphere by inversion of a set of sensor observations. The technique utilizes the Marquardt inversion method coupled to a Gaussian puff atmospheric dispersion model. The major objective of this report is to perform a set of sensitivity calculations to explore the ...

The least squares method of rock noise source location presented is shown to be more accurate and reliable than standard direct solution methods. This method is particularly effective in improving solutions from rock noise locations outside of geophone array boundaries. A least squares solution for a medium in ...

Accurate seismic event location is integral to the effective monitoring of the Comprehensive Nuclear-Test-Ban Treaty (CTBT), as well as being a fundamental component of earthquake source characterization. To account for the effects of crustal and mantle s...

Accurate seismic event location is integral to the effective monitoring of the Comprehensive Nuclear-Test-Ban Treaty (CTBT), as well as being a fundamental component of earthquake source characterization. To account for the effects of crustal and mantle s...

An improved pulsed ion source of the type where the gas to be ionized is released within the source by momentary heating of an electrode occluded with the gas is presented. The other details of the ion source construction include an electron emitting filament and a positive reference grid, between which an electron discharge ...

With the initiation of the navigation accuracy prediction algorithm used to estimate the amount of GPS solution (location and time) error for receivers, the capability to accurately predict solution errors due to the major GPS error sources is growing. Al...

This paper is the third in a series developing methods of mapping acoustic emission (AE) signals and wave propagation in engines and focuses on source location techniques for the multi-source signals on relatively complex structures typical of machinery applications. Two source location ...

Treatment planning for ultrasound-guided transperitoneal I-125 permanent prostatic implants is a time consuming task, because this treatment uses many seeds (e.g. 50-80) and there are many solutions (seed positions) for optimizing the dose distribution. In conventional treatment planning for brachytherapy the locations of sources are usually input into a ...

The disclosure of the invention is directed to a site survey ground vehicle based apparatus and method for automatically detecting source materials, such as radioactivity, marking the location of the source materials, such as with paint, and mapping the location of the source materials on a ...

The disclosure of the invention is directed to a site survey ground vehicle based apparatus and method for automatically detecting source materials, such as radioactivity, marking the location of the source materials, such as with paint, and mapping the location of the source materials on a ...

Colorado's location, far removed from moisture sources, combines with its wide variety of orographic features to make the accurate forecasting of convective storms quite difficult. A brief climatology of Colorado severe convective storms - those that prod...

The relationship of the concentration of air pollutants to wind direction has been determined by nonparametric regression using a Gaussian kernel. The results are smooth curves with error bars that allow for the accurate determination of the wind direction where the concentrat...

........................................................................................................ 2 II. FEATURES AND EFFECTS OF UNDERGROUND NUCLEAR TESTING .............................. 4 1 of evasive testing of nuclear weapons, visual inspection can greatly augment the certainty and detail" in cases of suspected nuclear testing, but it also can provide accurate ...

Numerical calculation of infrasound propagation paths is necessary to support accurate infrasound event identification, phase association, and source location. Predicting the details of infrasound propagation relies both on propagation models that capture...

An improved ion source is described for accurately presetting the size amd location of the gas and ion efflux opening. for determining the contour of the electrical field in the vicinity of the arc, and for generally improving the operation of the calutron source. The above features are accomplished by the ...

We use acoustic (3.3-500 Hz) arrays to locate local (<20 km) thunder produced by triggered lightning in the Magdalena Mountains of central New Mexico. The locations of the thunder sources are determined by the array back azimuth and the elapsed time since discharge of the lightning flash. We compare the acoustic ...

Page 1. Receiver Sites for Accurate Indoor ... 4. TITLE AND SUBTITLE Receiver Sites for Accurate Indoor Position Location Systems 5a. ...

A reconstruction method of bioluminescence sources is proposed based on a phase approximation model. Compared with the diffuse approximation, this phase approximation model more correctly predicts bioluminescence photon propagation in biological tissues, so that bioluminescence tomography can accurately locate and quantify the ...

This paper presents simple and accurate mathematical formulation for determining the ground location

Empirical results from the current GSETT-3 illustrate the need for source specific information for the purpose of calibrating the monitoring system. With the specified location design goal of 1,000 km{sup 2}, preliminary analysis indicates the importance of regional calibration of travel times. This calibration information can be obtained in a passive ...

Electric currents in long pipelines can contribute to corrosion effects that limit the pipe's lifetime. One cause of such electric currents is the geomagnetic field variations that have sources in the Earth's upper atmosphere. Knowledge of the general behavior of the sources allows a prediction of the occurrence times, favorable ...

The need for a subsurface imaging technique to locate and characterize subsurface defects in multidimensional micro- and nanoengineered devices has been growing rapidly. We show that a subsurface heater can be located accurately using the phase lag of a thermal wave. We deduce that the absolute phase lag is composed of four components. ...

This paper describes the basis of an alternative approach for accurately locating faults on teed feeders and the technique developed utilizes fault voltages and currents at all three ends. The method is virtually independent of fault resistance and largely insensitive to variations in source impedance, teed and line configurations, ...