• Refine Query
  • Source
  • Publication year
  • to
  • Language
  • 141
  • 34
  • 25
  • 24
  • 6
  • 5
  • 5
  • 5
  • 5
  • 5
  • 2
  • 2
  • 1
  • 1
  • Tagged with
  • 271
  • 64
  • 58
  • 40
  • 36
  • 34
  • 33
  • 32
  • 32
  • 23
  • 21
  • 18
  • 18
  • 17
  • 16
  • About
  • The Global ETD Search service is a free service for researchers to find electronic theses and dissertations. This service is provided by the Networked Digital Library of Theses and Dissertations.
    Our metadata is collected from universities around the world. If you manage a university/consortium/country archive and want to be added, details can be found on the NDLTD website.
71

Modeling PET blood curves /

Olshen, Adam B. January 1997 (has links)
Thesis (Ph. D.)--University of Washington, 1997. / Includes bibliographical references (leaves [88]-96).
72

Uses of chlorofluorocarbons as ocean tracers and for estimating the removal rates of CFC-11 and carbon tetrachloride in certain marine environments /

Lee, Bing-Sun. January 1998 (has links)
Thesis (Ph. D.)--University of Washington, 1998. / Vita. Includes bibliographical references (leaves [166]-175).
73

Isotopic labeling of methane and ethylene by uranium hydride-hydrocarbon exchange

Lumba, Linda Gamboa, January 1969 (has links)
Thesis (M.S.)--University of Wisconsin--Madison, 1969. / eContent provider-neutral record in process. Description based on print version record. Includes bibliographical references.
74

Experimental and numerical study of solute transport through saturated fractured porous aquifer /

Amoah, Nelson, January 1997 (has links)
Thesis (Ph. D.)--Memorial University of Newfoundland, 1997. / Blbliography: leaves 223-235. Also available online.
75

Understanding the non-conservative behaviour of fluorescein

Smith, Simon Alastair. January 2002 (has links)
Thesis (M.Sc.(Water Utilisation))--University of Pretoria, 2001. / Summaries in Afrikaans and English. Includes bibliographical references.
76

The uranium-series radionuclides as tracers of geochemical processes in Long Island Sound

Benninger, Larry K. January 1976 (has links)
Thesis--Yale. / Includes bibliographical references (leaves 137-151).
77

Explorations of hippocampal zinc using zinc-selective fluorescent dyes

Nydegger, Irma. Kay, Alan R. January 2009 (has links)
Thesis supervisor: Alan R. Kay. Includes bibliographic references (p. 157-173).
78

Groundwater systems in Iceland traced by deuterium

Bragi Árnason. January 1976 (has links)
Thesis--Reykjavík, 1976. / Summary in Icelandic. Includes bibliographical references (p. 180-185).
79

Potential role of methane-derived carbon as a food source for Daphnia in a North Carolina reservoir

Berkeley, Candace L. Unknown Date (has links)
Thesis (M.S.)--The University of North Carolina at Greensboro, 2010. / Directed by Anne Hershey; submitted to the Dept. of Biology.
80

Application of pharmacokinetic models to projection data in positron emission tomography

Maguire, Ralph Paul January 1999 (has links)
In positron emission tomography (PET), coincidence detection of annihilation photons enables the measurement of Radon transforms of the instantaneous activity concentration of labelled tracers in the human body. Using reconstruction algorithms, spatial maps of the activity distribution can be created and analysed to reveal the pharmacokinetics of the labelled tracer. This thesis considers the possibility of applying pharmacokinetic modelling to the count rate data measured by the detectors, rather than reconstructed images, A new concept is proposed - parameter projections - Radon transforms of the spatial distribution of the parameters of the model, which simplifies the problem considerably. Using this idea, a general linear least squares GLLS framework is developed and applied to the one and two tissue-compartment models for [O-15]water and [F-18]FDG. Simulation models are developed from first principles to demonstrate the accuracy of the GLLS approach to parameter estimation. This requires the validation of the whole body distribution of each of the tracers, using pharmacokinetic techniques, leading to novel compartment based whole body models for [O-15]water and [F-18]FDG. A simplified Monte-Carlo framework for error estimation of the tissue models is developed, based on system parameters. It is also shown that the variances of maps of the spatial variance of the parameters of the model - parametric images - can be calculated in projection space. It is clearly demonstrated that the precision of the variance estimates is higher than that obtained from estimates based on reconstructed images. Using the methods, it is shown how statistical parametric maps of the difference between two neuronal activation conditions can be calculated from projection data. The methods developed allow faster results analysis, avoiding lengthy reconstruction of large data sets, and allow access to robust statistical techniques for activation analysis through use of the known, Poisson distributed nature, of the measured projection data.

Page generated in 0.0242 seconds