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Indoor Localization Using Magnetic Fields

Description: Indoor localization consists of locating oneself inside new buildings. GPS does not work indoors due to multipath reflection and signal blockage. WiFi based systems assume ubiquitous availability and infrastructure based systems require expensive installations, hence making indoor localization an open problem. This dissertation consists of solving the problem of indoor localization by thoroughly exploiting the indoor ambient magnetic fields comprising mainly of disturbances termed as anomalies … more
Date: December 2011
Creator: Pathapati Subbu, Kalyan Sasidhar
Item Type: Refine your search to only Thesis or Dissertation
Partner: UNT Libraries
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Giant cross-magnetic-field steps due to binary collisions between pair particles

Description: Article explores giant cross-magnetic-field steps which occur as a result of positron-electron collisions. Within a constant magnetic field (e.g., 1 T), a collision between a positron and an electron can result in a correlated drift across the magnetic field for a continuous range of impact parameters. Within this range, drift distances orders of magnitude larger than that associated with like-charge collisions were observed by computer simulation.
Date: March 5, 2015
Creator: Aguirre, F. F. & Ordonez, Carlos A.
Item Type: Refine your search to only Article
Partner: UNT College of Arts and Sciences
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[News Script: Skylab]

Description: Script from the WBAP-TV/NBC station in Fort Worth, Texas, relating a news story about the Skylab- one astronauts who have eleven days left in orbit but the Skylab two rocket has already been rolled into place for its liftoff.
Date: June 11, 1973, 6:30 a.m.
Creator: WBAP-TV (Television station : Fort Worth, Tex.)
Item Type: Refine your search to only Script
Partner: UNT Libraries Special Collections
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Servo System for Magnetic Controlled Constant Intensity Flat Top Beam Spill-Out

Description: A uniform intensity flat top spill-out cannot be obtained by manual control for two reasons: 1. The horizontal density of the internal beam of the Cosmotron is far from uniform. As a result, a manually controlled linear motion of the internal beam into a target will result in a non-uniform spill-out intensity. 2. Stability requirements of the Cosmotron magnet voltage are not easily met without feedback because of inherent component stability. The proposed servo system will sense the external be… more
Date: November 21, 1961
Creator: Cottingham, J. G.
Item Type: Refine your search to only Report
Partner: UNT Libraries Government Documents Department
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Acceleration of Polarized Protons to Relativistic Energies

Description: Maintenance of polarization of polarized protons in a linear accelerator is known to be feasible. Circular accelerators present a different problem, and the investigation of the interaction of orbit dynamics and particle polarization in general is undertaken. The equation of motion of the spin vector of a charged particle in a magnetic field as formulated by Bargmann, Michel, and Telegdi is utilized in the study of depolarization for several accelerators. High values of depolarization are obtai… more
Date: January 22, 1962
Creator: Courant, E.D.
Item Type: Refine your search to only Report
Partner: UNT Libraries Government Documents Department
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Cosmic Ray Produced Ar37 and Ar39 Activities in Recently Fallen Meteorites

Description: Several methods of determining meteorite ages depend ages upon nuclides formed by cosmic ray interactions. The tactic assumption is always made that the intensity of cosmic radiation does not vary in time or space. However it is known that the intensity of cosmic radiation at the earth varies with the solar activity. The spectrum of cosmic ray protons and alpha particles exhibit a marked drop at the low energy end (<1.5 GeV) and the intensity in the region appears to follow the 11 year cycle of… more
Date: February 1, 1968
Creator: Davis, R. Jr.; Stoenner, R. W. & Schaeffer, O. A.
Item Type: Refine your search to only Report
Partner: UNT Libraries Government Documents Department
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Some Experiments Relating Ion Diffusion in a Plasma to the Neutral Gas Density in the Presence of a Magnetic Field

Description: In some recent experiments the ion density in a plasma was measured as a function of radial distance from a d-c arc source of ions for the magnetic field intensities from 2500 to 14000 oersted. The diffusion coefficient appeared to very inversely as the square of the magnetic field strength, D~1/H2. The absolute value of D was shown to be approximately that which would be predicted by the collision diffusion theory when account is taken of the shorting effect of the end walls. The purpose of th… more
Date: June 15, 1956
Creator: Reidigh, Rodger V.
Item Type: Refine your search to only Report
Partner: UNT Libraries Government Documents Department
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Lattice quantum magnetometry

Description: Article presenting the idea of lattice quantum magnetometry, i.e., quantum sensing of magnetic fields by a charged (spinless) particle placed on a finite two-dimensional lattice.
Date: June 24, 2019
Creator: Razzoli, Luca; Ghirardi, Luca; Siloi, Ilaria; Bordone, Paolo & Paris, Matteo G. A.
Item Type: Refine your search to only Article
Partner: UNT College of Science
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Diffusion of Ions in a Plasma Across a Magnetic Field

Description: A theoretical and experimental investigation of the coefficient for diffusion of ions across a magnetic field Is described. The resultant diffusion coefficient is found to vary inversely as the square of the magnetic field strength, in accord with the usual collison-diffusion theory. The magnitude of the coefficient is much larger (x700) than the coefficient predicted by the usual ambipolar diffusion theory. This discrepancy is resolved by showing that diffusion across a magnetic field is not a… more
Date: July 1955
Creator: Simon, Albert & Neidign, Rodger V.
Item Type: Refine your search to only Report
Partner: UNT Libraries Government Documents Department
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80" Chamber - Low Energy Beams

Description: One of the major, as well as first, decisions which must be taken on a large chamber is to decide on the direction of the magnetic field, i.e., vertical or horizontal. Either alternative has advantages and disadvantages ad it is the intention of this note to discuss these features.
Date: January 3, 1964
Creator: Rau, R. R.
Item Type: Refine your search to only Report
Partner: UNT Libraries Government Documents Department
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Considerations on the Magnet for the 80" Hydrogen Bubble Chamber

Description: For momentum measurements in bubble chambers a magnetic field has to e provided. The following discussion summarizes approximate calculations to determine the necessary amounts of copper and iron for our projected 80" liquid hydrogen bubble chamber magnet. Without any refinements, the accuracy of momentum measurements is proportional to the square of the track length and therefore to the square of the linear dimension of the chamber. If the scale factor for the size of the chamber is λ, [equati… more
Date: unknown
Item Type: Refine your search to only Report
Partner: UNT Libraries Government Documents Department
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Magnet Coils Detailed Conductor Design

Description: On the basis of measurements made upon analogues of the proposed magnet, it was decided that the distribution of ampere-turns between the two exciting coils should be in a ratio of about 1:33:1. This distribution is expected to minimize the variation of the magnetic field intensity over the depth. of the chamber. Simplicity of construction demands that there be an integral number of turns in each layer of conductors. If no water connections are to be made at the inside of the coils, each coil m… more
Date: January 7, 1964
Item Type: Refine your search to only Report
Partner: UNT Libraries Government Documents Department
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