Global ETD Search
Search theses and dissertations gathered from participating repositories worldwide. Every result links back to the library that holds it. No account is needed.
Results
Showing 1 to 14 of 14 for “"detector efficiency"”.
-
Pose estimation using cascade trees
In this thesis, I implemented and extended a face detector, based on cascades of boosted features, for use in real time systems. The extensions are twofold. First, I designed a way of combining several cascades into a cascade tree, and showed how such a tree provides a powerful mechanism for …
-
A root cause analysis of REXIS detection efficiency loss during phase E operations
… science operations, the instrument experienced detector efficiency loss in the form of loss of iron calibration source counts, which greatly affected the science output. In this thesis, a root cause investigation is performed on the loss of iron counts, and an optical light leak onto the edge of …
-
Investigation of the Photoneutron Cross Section in Lead-206 and Lead-208 From 9 to 16 Mev (Photon, Statistical, Decay, Giant Resonance)
… 7.6% at 1 MeV and 12.5% at 5 MeV. Neutron detector efficiency was determined by measuring the photo-disintegration of deuterium. The resulting efficiency was found to be constant across the neutron energy range of interest. The fraction of neutrons with energy insufficient to pass the …
-
Novel Neutron Detector for n-n Scattering Length Measurement
… with large uncertainties caused by neutron detector cross talk. Many experimentalists also rely upon computer code to calibrate their neutron detectors. Experiments give one of two different numbers but there is still no adequate explanation for this discrepancy. We have developed a new …
-
Generator-level acceptance for the measurement of the inclusive cross section of W-boson and Z-boson production in pp collisions at [square root of] s = 5 TeV with the CMS detector at the LHC
… inclusive cross section requires calculating the detector acceptance of decay products. The acceptance of the CMS detector of leptonic decays of W and Z bosons produced in pp colisions at [square root of]s = 5 TeV is calculated using Monte Carlo event simulation. Statistical and systematic …
-
The development of the national accelerator centre proton microprobe as an analytical tool in geochemistry
… package. The use of the Si(Li) energy dispersive detector provides simultaneous multi-element detection at the parts-per-million (ppm) level, and a scanning beam facility permits trace element distributions to be studied at these levels. The calibration of the detector efficiency and the …
-
Low energy neutron-proton interactions
… giving cross sections which are independent of detector efficiency and dead time. These results fill a significant gap in the available data below 500 keV.
-
Novel techniques for the detection and localization of attenuated gamma-ray sources
The use of cylindrical solid-crystal detectors for the detection and removal of gamma-emitting sources has become a common practice for the clean-up of radiological contaminated sites. It is often difficult to determine the capability of detecting a sub-surface source without performing …
-
Investigation of the photoneutron cross section in 206Pb and 208 Pb from 9 to 16 MeV
… 7.6% at 1 MeV and 12.5% at 5 MeV. Neutron detector efficiency was determined by measuring the photo-disintegration of deuterium. The resulting efficiency was found to be constant across the neutron energy range of interest. The fraction of neutrons with energy insufficient to pass the …
-
In vivo nitrogen measurement by use of (n,2n) method and PGNAA
… are the activating neutron flux and the absolute detector efficiency. The distribution of the two factors in the human body is dependent on the spectral characteristics of the neutron source, the geometries of irradiation and counting systems and the size of the subject. In this thesis …
-
Study of the performances of the AMIGA muon detectors of the Pierre Auger Observatory
… from 3 × 10^18 down to 10^17 eV by means of new detectors including three additional fluorescence telescopes with a more elevated field of view (HEAT) and a nested surface array with 750 m spacing and additional muon detection capabilities (AMIGA). With these enhancements, the Pierre Auger …
-
QUANTIFICATION OF LOW ENERGY X-RAY DETECTION IN EDS DETECTORS
… of energy dispersive spectroscopy (EDS) detectors for application in scanning electron microscopy is proposed. In this approach an empirical parameter is computed from the x-ray spectra. This parameter represents absorption of lower energy x-rays by the EDS detector and depends on …
-
Measurement of the ultra high energy cosmic ray flux from data of very inclined showers at the Pierre Auger Observatory
… a combination of a surface and a fluorescence detector. The fluorescence detector measures the energy loss profile of the shower in the air which can be integrated to yield the total energy of the cosmic ray. The surface detector consists of a ground array of particle detectors which sample the …