Using technology to gain knowledge

Merwe, Ronell Van Der; Heerden, Dalize Van

doi:10.1145/2815782.2815783

Cited by 3 publications

(2 citation statements)

References 10 publications

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“…In this work, a modular scintillator array offering improved absolute efficiencies has been constructed to supplement the semiconductor array. Characterisation of the system has been performed, extending previous work [6] and leading towards the development of a hybrid PEPT system for the study of micro-scale phenomena.…”

Section: Introductionmentioning

confidence: 94%

Micro-scale particle tracking using hybrid detectors

van der Merwe,

Peterson,

Buffler

et al. 2023

J. Phys.: Conf. Ser.

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Positron Emission Particle Tracking (PEPT) techniques allow the tracking of a radioactive tracer particle moving within a system of flow, enabling non-invasive study of dynamic systems. On the micro-scale, PEPT performance is limited by the achievable activity in radiolabelling a suitable tracer particle, and the fixed geometry of conventional detector systems. To enable application of PEPT towards these scales advanced instrumentation is required, and a hybrid detection system has been developed combining scintillator and semiconductor devices. A bismuth germanate oxide (BGO) scintillator array consisting of 1024 detector elements derived from CTI/Siemens PET scanners (512 pixels of 6.75 x 6.25 x 30 mm3 and 512 pixels of 4.1 x 4.0 x 30 mm3) forms a field of view of 150 x 196 x 101 mm3. A pair of pixelated cadmium zinc telluride room temperature semiconductors (9680 pixels of 1.8 x 1.8 x 0.5 mm3) form a high spatial resolution region of 62 x 42 x 20 mm3 placed within the larger field of view. The design choice maximizes absolute efficiency by merit of the scintillators and enhances spatial resolution through the semiconductors. Energy and timing resolutions of the BGO elements were determined, and sensitivity profiles of the system modelled numerically, enabling the characterization of the system absolute efficiency and spatial resolution. The results suggest the applicability of PEPT in the study of microscale flows for the first time, including investigating flows in capillaries and micro-fluidic devices.

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Section: Introductionmentioning

confidence: 94%

Micro-scale particle tracking using hybrid detectors

van der Merwe,

Peterson,

Buffler

et al. 2023

J. Phys.: Conf. Ser.

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“…The use of pixelated cadmium-zinc-telluride room-temperature semiconductor arrays (9680 pixels of 1.8 × 1.8 × 0.5 mm 3 ), is being explored with a hybrid modular camera system consisting of both detector types offering the highest potential for precision measurements of small-scale flows. The design forms a field of view of 150 × 200 × 100 mm 3 , with a central high spatial resolution region [8], being described in detail in these proceedings [9]. A Siemens Biograph 16 combined PET/CT tomograph (Figure 2, right) capable of measuring structure (via X-ray attenuation) and function (via emission imaging) has recently been acquired (funded through the UCT Equipment Committee) [10].…”

Section: Radioisotope Production and Tracer Particle Fabricationmentioning

confidence: 99%

Dynamics of physical flows measured by positron emission techniques

Leadbeater,

Buffler,

Peterson

et al. 2023

J. Phys.: Conf. Ser.

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Short lived positron emitting species are used to produce flow-following tracer particles to study flow dynamics in a technique known as positron emission particle tracking (PEPT). The photon pairs produced by positron annihilation are detected in time coincidence by arrays of high-speed position sensitive detectors. Reconstruction of consecutive annihilations are used to determine the near-instantaneous position of the tracer particle. Hence, the resulting bulk flow dynamics are derived, including residence times, velocities, accelerations, and related kinematic properties. The Department of Physics at the University of Cape Town uses PEPT to study dynamic physical processes, turbulent, and multiphase flows. Studies aim to address global challenge topics including problems in water scarce environments, reducing industrial wastes, and enhancing developments towards sustainable economies through improved process efficiencies and design led approaches. The PEPT Cape Town enterprise is discussed, including the development of flow metrology systems and complementary nuclear measurement techniques. Research encompasses four key themes: radioisotope tracer production, instrumentation & detector development, data acquisition & processing, and flow metrology.

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Trends, drivers and barriers influencing cloud computing services for mobile interactions in teaching and learning

Biljon

Merwe

2018

2018 Conference on Information Communications Technology and Society (ICTAS)

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The potential of cloud computing services (CCS) for supporting teaching and learning has been widely recognized, especially for mobile interactions. However, the multifaceted nature and rapid development of computing technology has complicated adoption and optimal application. This study investigated the trends, drivers and barriers influencing CCS for teaching and learning with mobile interactions both from a literature perspective and an educator's perspective. We structured the research in terms of three goals: The first goal was that of providing an overview of current literature on the topic of CCS for mobile interactions. To that end, a systematic literature review was conducted (literature from 2010 to 2016) to present an overview of the topics researched, as well as the determinants (including drivers and barriers) and opportunity areas in the field. The second goal was to get the perspective of educators on the determinants and enablers of CCS for teaching and learning with mobile interactions in the South African school context. Facilitators and teachers at South African schools in the Gauteng Province were interviewed towards obtaining that perspective. The third goal was to draw on the findings from literature and the insights gained from educators in South African schools towards identifying the barriers and enablers relevant to informing future research and practice.

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Using technology to gain knowledge

Cited by 3 publications

References 10 publications

Micro-scale particle tracking using hybrid detectors

Micro-scale particle tracking using hybrid detectors

Dynamics of physical flows measured by positron emission techniques

Trends, drivers and barriers influencing cloud computing services for mobile interactions in teaching and learning

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