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Showing 1 to 20 of 31 for “"PEPT"”.
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Multiple particle tracking in PEPT using Voronoi tessellations
An algorithm is presented which makes use of three-dimensional Voronoi tessellations to track up to 20 tracers using a PET scanner. The lines of response generated by the PET scanner are discretized into sets of equidistant points, and these are used as the input seeds to the Voronoi tessellation. …
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Enhancing PEPT: high fidelity analysis techniques with augmented detection systems
Positron emission particle tracking (PEPT) is a non-invasive, tracer-based technique used in the study of dynamic systems, such as particulate and fluid flows. Relying on positron imaging principles, typical PEPT systems operate with millimetre precision at tracking speeds of up to 10 m/s, with …
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Development of 18F radiochemistry for positron emission particle tracking (PEPT)
Positron emission particle tracking (PEPT) is a non-invasive tracer-based measurement technique used to obtain dynamic information about multiphase systems. The basis of the technique is to radiolabel a phase-representative tracer particle with a positron emitting radionuclide. Electron-positron …
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Enhancing PEPT: high fidelity analysis techniques with augmented detection systems
Positron emission particle tracking (PEPT) is a non-invasive, tracer-based technique used in the study of dynamic systems, such as particulate and fluid flows. Relying on positron imaging principles, typical PEPT systems operate with millimetre precision at tracking speeds of up to 10 m/s, with …
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Application of PEPT to track a single labelled red blood cell in vitro
Positron Emission Particle Tracking (PEPT) was invented and developed at Birmingham. This technique is a variant of the medical imaging technique of positron emission tomography (PET). The tracking technique enables a single positron-emitting tracer particle to be tracked accurately inside an …
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Circulation rate modelling of tumbling mill charge using positron emission particle tracking (PEPT)
… from positron emission particle tracking (PEPT) experiments conducted at the University of Birmingham positron imaging centre and further experiments were conducted at the iThemba LABS in Cape Town. The experimental approach is highly suited to allow the effective examination of the …
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New technique for radiolabelling tracer with 64CU for positron emission particles tracking (PEPT) experiments
Positron emission particle tracking (PEPT) is a non-invasive technique for studying the flow of particulate systems within industrial equipment. The technique tracks a tracer particle labelled with a positron emitting radionuclide moving within the field-of-view of a positron emission tomography …
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Observing flow using fast neutron radiography and positron emission particle tracking
… (FNR) and positron emission particle tracking (PEPT). A new fast neutron imaging system was commissioned at The South African Nuclear Energy Corporation, Pretoria, as part of this study, although FNR measurements were ultimately performed at PhysikalischTechnische Bundesanstalt (PTB), …
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Evaluating the influence of lifter face angle on the trajectory of particles in a tumbling mill using PEPT
… using the Positron Emission Particle Tracking (PEPT) to obtain the location of the particle with time. The particle was radiated with a radionuclide; ⁶⁸8Ga, which has a half-life of 68 minutes. The objectives of the study involved tests with different lifter face angles at different mill speeds …
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Solids motion in fluidised beds of fine particles
… known as Positron Emission Particle Tracking (PEPT) to track the motion of a single radioactively labelled particle inside a fluidised bed. Recent developments in PEPT include new ways of labelling micron sized tracer particles that can be as small as 60 μm and the new mobile camera system also …
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Using positron emission particle tracking (PEPT) to investigate the motion of granular media in a laboratory-scale tumbling mill
… for positron emission particle tracking (PEPT) data, based on the RTD. This suite contains routines for the triangulation, optimisation and pre-processing of PEPT data, as well as for obtaining residence time probability and time-averaged kinematic distributions in 3D space, and for …
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Genetic analysis of RNA polymerase/transcriptional activator interactions at thepepT promoter of S. typhimurium
… the FNR-dependent anaerobic induction of the pepT gene of S. typhimurium. Each of these mutations (G311E, G311R, L289F, R317H, W320ter) affects an amino acid in the C-terminal region of the alpha subunit. Phenotypic characterization shows that four of the five mutations have relatively …
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Tracing particle movement for simulation of light history and algal growth in airlift photobioreactors using Positron Emission Particle Tracking (PEPT)
This Thesis is embargoed. Only the Abstract is available
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The study of the influence of the lifter height on the charge motion, velocity profile and power draw of a laboratory tumbling mill using DEM simulations
… Positron Emission Particle Tracking (PEPT) is used to track the charge motion of particles in tumbling mill systems. The data has been used to derive a velocity profile for particle motion between the mill shell and centre of circulation (COC), a region that highlights the distinct …
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Sub-Millimetre Positron-Emission Particle Tracking Using a CdZnTe Semiconductor Array
The Positron Emission Particle Tracking (PEPT) technique has been in development in Cape Town since 2009, and typically allows the tracking of a 1 mm diameter positron-emitting source travelling at 1 m/s with precision around 1 mm at kHz rates. Conventionally, PEPT utilises large, high efficiency …
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Assessing the influence of lifter profiles on the velocity profile and the charge toe and shoulder using data from the PEPT system
… of selected particles in the charge. using the PEPT system. The PEPT experiments were conducted at IThemba Labs in Cape Town South Africa using a 300 mm x 285 mm experimental mill. The charge used for the experiments were glass beads with an approximate specific gravity (SG) of 2.7. The PEPT …
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The development of positron imaging systems for applications in industrial process tomography
… called Positron Emission Particle Tracking (PEPT) is used to study granular materials and fluid flows in a number of different applications. This thesis describes the most recent development of the detector systems which are used for PEPT studies at the Positron Imaging Centre. Primarily, the …
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Improving the selectivity of the radio-labelling of ion exchange resin tracers for positron emission particle tracking
Positron emission particle tracking (PEPT) is a technique which non-invasively tracks tracer particles labelled with a positron emitting radionuclide in a system of flow. The tracers are tracked through the detection in a PET scanner, of the two nearly collinear 511 keV gamma rays resulting from …
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Lagrangian studies of turbulent mixing in a vessel agitated by a rushron turbine: positron emission particle tracking (PEPT) and computational fluid dynamics (CFD)
… gamma rays. Positron Emission Particle Tracking (PEPT) has been developed at the University of Birmingham and has been used in a wide range of applications including stirred tanks. However, for agitated vessels, any attempt of validation of the PEPT technique versus other techniques cannot be …
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Investigating multi-directional inhomogeneous granular suspensions
… a series of Positron Emission Particle Tracking (PEPT) experiments and Discrete Element Method (DEM) simulations of rotating drums with a viscous fluid. The three aims of the thesis are, to investigate the use of the Ergodic hypothesis when analysing PEPT data, to test the use of the lubrication …
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