University of Toronto

Assistant Professor

George worked at University of Toronto as a Assistant Professor

Queen's University

Assistant Professor

Greek and Latin. Ancient History. Art Conservation. Geological Science and Engineering.

Queen's University

Associate Professor

Greek and Latin. Ancient History. Art Conservation. Geological Science and Engineering.

Queen's University

Associate Professor

Geography and Planning, Geological Science and Engineering

Balkan Heritage Field School

Instructor

George worked at Balkan Heritage Field School as a Instructor

Funerary Speech for John Chrysostom

Liverpool University Press

This book offers the first English translation of the funerary speech for John Chyrsostom delivered by one of his former clergy in a city close to Constantinople in the autumn of 407 when news arrived of John’s death on a forced march in eastern Asia Minor. The speech is the earliest and fullest account of John’s activities as bishop of Constantinople between 397 and 404. It replaces the slightly later Historical Dialogue on John by Palladius as the prime source for John in Constantinople The translators are both Late Roman Historians, and their introduction and notes illustrate the importance of this new text, which was first edited critically and published as recently as 2007.

Funerary Speech for John Chrysostom

Liverpool University Press

This book offers the first English translation of the funerary speech for John Chyrsostom delivered by one of his former clergy in a city close to Constantinople in the autumn of 407 when news arrived of John’s death on a forced march in eastern Asia Minor. The speech is the earliest and fullest account of John’s activities as bishop of Constantinople between 397 and 404. It replaces the slightly later Historical Dialogue on John by Palladius as the prime source for John in Constantinople The translators are both Late Roman Historians, and their introduction and notes illustrate the importance of this new text, which was first edited critically and published as recently as 2007.

Comparison of Image Filters for Low Dose Neutron Imaging

Physics Procedia

Neutron imaging using low flux sources, such as accelerators or low flux nuclear reactors, produces images which contain significant amounts of noise. The noise indications are a result of high energy gamma radiation and some neutron scattering which hit the CCD detector despite heavy shielding. The amount of noise in an image is a factor of the exposure time required to produce images with adequate dynamic ranges. Minimization of noise and maximization of the dynamic range are inversely proportional and the exposure time is often extended to increase incident neutrons at the expense of noise. The resultant noise can be reduced using image filters; however, these filters usually increase the signal to noise ratio (SNR) at the expense of spatial resolution. Three filters were applied to low dose neutron images acquired at RMC; a median filter, a Z-projection filter and a hybrid PDE filter. The median filter and the hybrid PDE filter showed similar performance in 3D with regards to SNR and spatial resolution, however, the median filter created numerous artefacts in the resultant tomogram. The Z-projection filter using 5 projections had the best performance in 2D improving the SNR of the raw image from 10.2 ± 0.767 to 22.5 ± 1.52 and the spatial resolution from 331 ± 2.89 to 309 ± 0.846, respectively. The Z-projection filter was not evaluated in 3D due to facility induced constraints.

Funerary Speech for John Chrysostom

Liverpool University Press

This book offers the first English translation of the funerary speech for John Chyrsostom delivered by one of his former clergy in a city close to Constantinople in the autumn of 407 when news arrived of John’s death on a forced march in eastern Asia Minor. The speech is the earliest and fullest account of John’s activities as bishop of Constantinople between 397 and 404. It replaces the slightly later Historical Dialogue on John by Palladius as the prime source for John in Constantinople The translators are both Late Roman Historians, and their introduction and notes illustrate the importance of this new text, which was first edited critically and published as recently as 2007.

Comparison of Image Filters for Low Dose Neutron Imaging

Physics Procedia

Neutron imaging using low flux sources, such as accelerators or low flux nuclear reactors, produces images which contain significant amounts of noise. The noise indications are a result of high energy gamma radiation and some neutron scattering which hit the CCD detector despite heavy shielding. The amount of noise in an image is a factor of the exposure time required to produce images with adequate dynamic ranges. Minimization of noise and maximization of the dynamic range are inversely proportional and the exposure time is often extended to increase incident neutrons at the expense of noise. The resultant noise can be reduced using image filters; however, these filters usually increase the signal to noise ratio (SNR) at the expense of spatial resolution. Three filters were applied to low dose neutron images acquired at RMC; a median filter, a Z-projection filter and a hybrid PDE filter. The median filter and the hybrid PDE filter showed similar performance in 3D with regards to SNR and spatial resolution, however, the median filter created numerous artefacts in the resultant tomogram. The Z-projection filter using 5 projections had the best performance in 2D improving the SNR of the raw image from 10.2 ± 0.767 to 22.5 ± 1.52 and the spatial resolution from 331 ± 2.89 to 309 ± 0.846, respectively. The Z-projection filter was not evaluated in 3D due to facility induced constraints.

The First Brush: Paul Kane & Infrared Reflectography

ROM Press

This book is a unique insight into Paul Kane’s thinking and artistic processes between the years 1849 and 1856 as he painted in his Toronto studio. It explores the issue of truthfulness in Kane’s art and his struggle for composition. Additionally, these comparisons expose Kane’s response to external pressures, as well as his steadfastness to a realized vision.

Funerary Speech for John Chrysostom

Liverpool University Press

This book offers the first English translation of the funerary speech for John Chyrsostom delivered by one of his former clergy in a city close to Constantinople in the autumn of 407 when news arrived of John’s death on a forced march in eastern Asia Minor. The speech is the earliest and fullest account of John’s activities as bishop of Constantinople between 397 and 404. It replaces the slightly later Historical Dialogue on John by Palladius as the prime source for John in Constantinople The translators are both Late Roman Historians, and their introduction and notes illustrate the importance of this new text, which was first edited critically and published as recently as 2007.

Comparison of Image Filters for Low Dose Neutron Imaging

Physics Procedia

Neutron imaging using low flux sources, such as accelerators or low flux nuclear reactors, produces images which contain significant amounts of noise. The noise indications are a result of high energy gamma radiation and some neutron scattering which hit the CCD detector despite heavy shielding. The amount of noise in an image is a factor of the exposure time required to produce images with adequate dynamic ranges. Minimization of noise and maximization of the dynamic range are inversely proportional and the exposure time is often extended to increase incident neutrons at the expense of noise. The resultant noise can be reduced using image filters; however, these filters usually increase the signal to noise ratio (SNR) at the expense of spatial resolution. Three filters were applied to low dose neutron images acquired at RMC; a median filter, a Z-projection filter and a hybrid PDE filter. The median filter and the hybrid PDE filter showed similar performance in 3D with regards to SNR and spatial resolution, however, the median filter created numerous artefacts in the resultant tomogram. The Z-projection filter using 5 projections had the best performance in 2D improving the SNR of the raw image from 10.2 ± 0.767 to 22.5 ± 1.52 and the spatial resolution from 331 ± 2.89 to 309 ± 0.846, respectively. The Z-projection filter was not evaluated in 3D due to facility induced constraints.

The First Brush: Paul Kane & Infrared Reflectography

ROM Press

This book is a unique insight into Paul Kane’s thinking and artistic processes between the years 1849 and 1856 as he painted in his Toronto studio. It explores the issue of truthfulness in Kane’s art and his struggle for composition. Additionally, these comparisons expose Kane’s response to external pressures, as well as his steadfastness to a realized vision.

Rock bench: Establishing a common repository and standards for assessing rockmass characteristics using LiDAR and photogrammetry.

Computers & Geosciences

Remote sensing methods are now used to assess rockmass characteristics along transportation corridors, in mines and tunnels, and in other areas where rock falls can affect humans and infrastructure. A variety of sensor methods, primarily LiDAR and photogrammetry, have seen recent use with widespread success and state of practice acceptance. Various commercial and custom tools exist to process the resulting data to extract geometry, surface and location based statistics, and to perform kinematic stability assessments. Although there is a widespread need to assess how different sensors and processing workflows actually perform, these are often compared anecdotally solely with the field practices they replace and using site and sensor data unavailable to other researchers. Two principles must be established to move across-the-board comparisons of remote rockmass characterization forward: (i) establishment of accessible, documented test sites, and (ii) test databases that are accessible to all. We propose the establishment of several key sites for equipment tests, including already-studied areas in Europe and North America, as well as an open approach to adding sites and related data to the collection. Site descriptions must include detailed local geology, photographs, LiDAR and/or photogrammetry datasets, and access notes. Second, we describe and provide a prototype data repository for storing this information, and in particular for providing open access to benchmark data into the future. This initiative will allow for meaningful comparisons of sensors and algorithms, and specifically will support better methodologies for benchmarking rock mass data in the geosciences. Data and metadata will be hosted at the www.rockbench.org domain.

Funerary Speech for John Chrysostom

Liverpool University Press

This book offers the first English translation of the funerary speech for John Chyrsostom delivered by one of his former clergy in a city close to Constantinople in the autumn of 407 when news arrived of John’s death on a forced march in eastern Asia Minor. The speech is the earliest and fullest account of John’s activities as bishop of Constantinople between 397 and 404. It replaces the slightly later Historical Dialogue on John by Palladius as the prime source for John in Constantinople The translators are both Late Roman Historians, and their introduction and notes illustrate the importance of this new text, which was first edited critically and published as recently as 2007.

Comparison of Image Filters for Low Dose Neutron Imaging

Physics Procedia

Neutron imaging using low flux sources, such as accelerators or low flux nuclear reactors, produces images which contain significant amounts of noise. The noise indications are a result of high energy gamma radiation and some neutron scattering which hit the CCD detector despite heavy shielding. The amount of noise in an image is a factor of the exposure time required to produce images with adequate dynamic ranges. Minimization of noise and maximization of the dynamic range are inversely proportional and the exposure time is often extended to increase incident neutrons at the expense of noise. The resultant noise can be reduced using image filters; however, these filters usually increase the signal to noise ratio (SNR) at the expense of spatial resolution. Three filters were applied to low dose neutron images acquired at RMC; a median filter, a Z-projection filter and a hybrid PDE filter. The median filter and the hybrid PDE filter showed similar performance in 3D with regards to SNR and spatial resolution, however, the median filter created numerous artefacts in the resultant tomogram. The Z-projection filter using 5 projections had the best performance in 2D improving the SNR of the raw image from 10.2 ± 0.767 to 22.5 ± 1.52 and the spatial resolution from 331 ± 2.89 to 309 ± 0.846, respectively. The Z-projection filter was not evaluated in 3D due to facility induced constraints.

The First Brush: Paul Kane & Infrared Reflectography

ROM Press

This book is a unique insight into Paul Kane’s thinking and artistic processes between the years 1849 and 1856 as he painted in his Toronto studio. It explores the issue of truthfulness in Kane’s art and his struggle for composition. Additionally, these comparisons expose Kane’s response to external pressures, as well as his steadfastness to a realized vision.

Rock bench: Establishing a common repository and standards for assessing rockmass characteristics using LiDAR and photogrammetry.

Computers & Geosciences

Remote sensing methods are now used to assess rockmass characteristics along transportation corridors, in mines and tunnels, and in other areas where rock falls can affect humans and infrastructure. A variety of sensor methods, primarily LiDAR and photogrammetry, have seen recent use with widespread success and state of practice acceptance. Various commercial and custom tools exist to process the resulting data to extract geometry, surface and location based statistics, and to perform kinematic stability assessments. Although there is a widespread need to assess how different sensors and processing workflows actually perform, these are often compared anecdotally solely with the field practices they replace and using site and sensor data unavailable to other researchers. Two principles must be established to move across-the-board comparisons of remote rockmass characterization forward: (i) establishment of accessible, documented test sites, and (ii) test databases that are accessible to all. We propose the establishment of several key sites for equipment tests, including already-studied areas in Europe and North America, as well as an open approach to adding sites and related data to the collection. Site descriptions must include detailed local geology, photographs, LiDAR and/or photogrammetry datasets, and access notes. Second, we describe and provide a prototype data repository for storing this information, and in particular for providing open access to benchmark data into the future. This initiative will allow for meaningful comparisons of sensors and algorithms, and specifically will support better methodologies for benchmarking rock mass data in the geosciences. Data and metadata will be hosted at the www.rockbench.org domain.

The trial of Eutyches: A new interpretation.

Byzantinische Zeitschrift

A new interpretation of the ecclesiastical politics of the years 448 and 449 CE in Constantinople that contests the generally adopted position of Eduard Schwartz.

Funerary Speech for John Chrysostom

Liverpool University Press

This book offers the first English translation of the funerary speech for John Chyrsostom delivered by one of his former clergy in a city close to Constantinople in the autumn of 407 when news arrived of John’s death on a forced march in eastern Asia Minor. The speech is the earliest and fullest account of John’s activities as bishop of Constantinople between 397 and 404. It replaces the slightly later Historical Dialogue on John by Palladius as the prime source for John in Constantinople The translators are both Late Roman Historians, and their introduction and notes illustrate the importance of this new text, which was first edited critically and published as recently as 2007.

Comparison of Image Filters for Low Dose Neutron Imaging

Physics Procedia

Neutron imaging using low flux sources, such as accelerators or low flux nuclear reactors, produces images which contain significant amounts of noise. The noise indications are a result of high energy gamma radiation and some neutron scattering which hit the CCD detector despite heavy shielding. The amount of noise in an image is a factor of the exposure time required to produce images with adequate dynamic ranges. Minimization of noise and maximization of the dynamic range are inversely proportional and the exposure time is often extended to increase incident neutrons at the expense of noise. The resultant noise can be reduced using image filters; however, these filters usually increase the signal to noise ratio (SNR) at the expense of spatial resolution. Three filters were applied to low dose neutron images acquired at RMC; a median filter, a Z-projection filter and a hybrid PDE filter. The median filter and the hybrid PDE filter showed similar performance in 3D with regards to SNR and spatial resolution, however, the median filter created numerous artefacts in the resultant tomogram. The Z-projection filter using 5 projections had the best performance in 2D improving the SNR of the raw image from 10.2 ± 0.767 to 22.5 ± 1.52 and the spatial resolution from 331 ± 2.89 to 309 ± 0.846, respectively. The Z-projection filter was not evaluated in 3D due to facility induced constraints.

The First Brush: Paul Kane & Infrared Reflectography

ROM Press

This book is a unique insight into Paul Kane’s thinking and artistic processes between the years 1849 and 1856 as he painted in his Toronto studio. It explores the issue of truthfulness in Kane’s art and his struggle for composition. Additionally, these comparisons expose Kane’s response to external pressures, as well as his steadfastness to a realized vision.

Rock bench: Establishing a common repository and standards for assessing rockmass characteristics using LiDAR and photogrammetry.

Computers & Geosciences

Remote sensing methods are now used to assess rockmass characteristics along transportation corridors, in mines and tunnels, and in other areas where rock falls can affect humans and infrastructure. A variety of sensor methods, primarily LiDAR and photogrammetry, have seen recent use with widespread success and state of practice acceptance. Various commercial and custom tools exist to process the resulting data to extract geometry, surface and location based statistics, and to perform kinematic stability assessments. Although there is a widespread need to assess how different sensors and processing workflows actually perform, these are often compared anecdotally solely with the field practices they replace and using site and sensor data unavailable to other researchers. Two principles must be established to move across-the-board comparisons of remote rockmass characterization forward: (i) establishment of accessible, documented test sites, and (ii) test databases that are accessible to all. We propose the establishment of several key sites for equipment tests, including already-studied areas in Europe and North America, as well as an open approach to adding sites and related data to the collection. Site descriptions must include detailed local geology, photographs, LiDAR and/or photogrammetry datasets, and access notes. Second, we describe and provide a prototype data repository for storing this information, and in particular for providing open access to benchmark data into the future. This initiative will allow for meaningful comparisons of sensors and algorithms, and specifically will support better methodologies for benchmarking rock mass data in the geosciences. Data and metadata will be hosted at the www.rockbench.org domain.

The trial of Eutyches: A new interpretation.

Byzantinische Zeitschrift

A new interpretation of the ecclesiastical politics of the years 448 and 449 CE in Constantinople that contests the generally adopted position of Eduard Schwartz.

Gigapixel Imaging and Photogrammetry: Development of a New Long Range Remote Imaging Technique

Remote Sensing

The use of terrestrial remote imaging techniques, specifically LiDAR (Light Detection And Ranging) and digital stereo-photogrammetry, are widely proven and accepted for the mapping of geological structure and monitoring of mass movements. The use of such technologies can be limited, however: LiDAR generally by the cost of acquisition, and stereo-photogrammetry by the tradeoff between possible resolution within the scene versus the spatial extent of the coverage. The objective of this research is to test a hybrid gigapixel photogrammetry method, and investigate optimal equipment configurations for use in mountainous terrain. The scope of the work included field testing at variable ranges, angles, resolutions, and in variable geological and climatologically settings. Original field work was carried out in Canada to test various lenses and cameras, and detailed field mapping excursions were conducted in Norway. The key findings of the research are example data generated by gigapixel photogrammetry, a detailed discussion on optimal photography equipment for gigapixel imaging, and implementations of the imaging possibilities for rockfall mapping. This paper represents a discussion about a new terrestrial 3-dimensional imaging technique. The findings of this research will directly benefit natural hazard mapping programs in which rockfall potential must be recorded and the use of standard 3-dimensional imaging techniques cannot be applied.

Funerary Speech for John Chrysostom

Liverpool University Press

This book offers the first English translation of the funerary speech for John Chyrsostom delivered by one of his former clergy in a city close to Constantinople in the autumn of 407 when news arrived of John’s death on a forced march in eastern Asia Minor. The speech is the earliest and fullest account of John’s activities as bishop of Constantinople between 397 and 404. It replaces the slightly later Historical Dialogue on John by Palladius as the prime source for John in Constantinople The translators are both Late Roman Historians, and their introduction and notes illustrate the importance of this new text, which was first edited critically and published as recently as 2007.

Comparison of Image Filters for Low Dose Neutron Imaging

Physics Procedia

Neutron imaging using low flux sources, such as accelerators or low flux nuclear reactors, produces images which contain significant amounts of noise. The noise indications are a result of high energy gamma radiation and some neutron scattering which hit the CCD detector despite heavy shielding. The amount of noise in an image is a factor of the exposure time required to produce images with adequate dynamic ranges. Minimization of noise and maximization of the dynamic range are inversely proportional and the exposure time is often extended to increase incident neutrons at the expense of noise. The resultant noise can be reduced using image filters; however, these filters usually increase the signal to noise ratio (SNR) at the expense of spatial resolution. Three filters were applied to low dose neutron images acquired at RMC; a median filter, a Z-projection filter and a hybrid PDE filter. The median filter and the hybrid PDE filter showed similar performance in 3D with regards to SNR and spatial resolution, however, the median filter created numerous artefacts in the resultant tomogram. The Z-projection filter using 5 projections had the best performance in 2D improving the SNR of the raw image from 10.2 ± 0.767 to 22.5 ± 1.52 and the spatial resolution from 331 ± 2.89 to 309 ± 0.846, respectively. The Z-projection filter was not evaluated in 3D due to facility induced constraints.

The First Brush: Paul Kane & Infrared Reflectography

ROM Press

This book is a unique insight into Paul Kane’s thinking and artistic processes between the years 1849 and 1856 as he painted in his Toronto studio. It explores the issue of truthfulness in Kane’s art and his struggle for composition. Additionally, these comparisons expose Kane’s response to external pressures, as well as his steadfastness to a realized vision.

Rock bench: Establishing a common repository and standards for assessing rockmass characteristics using LiDAR and photogrammetry.

Computers & Geosciences

Remote sensing methods are now used to assess rockmass characteristics along transportation corridors, in mines and tunnels, and in other areas where rock falls can affect humans and infrastructure. A variety of sensor methods, primarily LiDAR and photogrammetry, have seen recent use with widespread success and state of practice acceptance. Various commercial and custom tools exist to process the resulting data to extract geometry, surface and location based statistics, and to perform kinematic stability assessments. Although there is a widespread need to assess how different sensors and processing workflows actually perform, these are often compared anecdotally solely with the field practices they replace and using site and sensor data unavailable to other researchers. Two principles must be established to move across-the-board comparisons of remote rockmass characterization forward: (i) establishment of accessible, documented test sites, and (ii) test databases that are accessible to all. We propose the establishment of several key sites for equipment tests, including already-studied areas in Europe and North America, as well as an open approach to adding sites and related data to the collection. Site descriptions must include detailed local geology, photographs, LiDAR and/or photogrammetry datasets, and access notes. Second, we describe and provide a prototype data repository for storing this information, and in particular for providing open access to benchmark data into the future. This initiative will allow for meaningful comparisons of sensors and algorithms, and specifically will support better methodologies for benchmarking rock mass data in the geosciences. Data and metadata will be hosted at the www.rockbench.org domain.

The trial of Eutyches: A new interpretation.

Byzantinische Zeitschrift

A new interpretation of the ecclesiastical politics of the years 448 and 449 CE in Constantinople that contests the generally adopted position of Eduard Schwartz.

Gigapixel Imaging and Photogrammetry: Development of a New Long Range Remote Imaging Technique

Remote Sensing

The use of terrestrial remote imaging techniques, specifically LiDAR (Light Detection And Ranging) and digital stereo-photogrammetry, are widely proven and accepted for the mapping of geological structure and monitoring of mass movements. The use of such technologies can be limited, however: LiDAR generally by the cost of acquisition, and stereo-photogrammetry by the tradeoff between possible resolution within the scene versus the spatial extent of the coverage. The objective of this research is to test a hybrid gigapixel photogrammetry method, and investigate optimal equipment configurations for use in mountainous terrain. The scope of the work included field testing at variable ranges, angles, resolutions, and in variable geological and climatologically settings. Original field work was carried out in Canada to test various lenses and cameras, and detailed field mapping excursions were conducted in Norway. The key findings of the research are example data generated by gigapixel photogrammetry, a detailed discussion on optimal photography equipment for gigapixel imaging, and implementations of the imaging possibilities for rockfall mapping. This paper represents a discussion about a new terrestrial 3-dimensional imaging technique. The findings of this research will directly benefit natural hazard mapping programs in which rockfall potential must be recorded and the use of standard 3-dimensional imaging techniques cannot be applied.

The non-destructive determination of Pt in ancient Roman gold coins by XRF spectrometry

Journal of Analytical Atomic Spectrometry

The determination of trace concentrations of the platinum group elements in gold bullion can be significant for establishing the geographical location from which the gold was mined. Platinum is of particular importance for ancient gold as a marker of provenance. While many techniques have been used successfully to quantify Pt in a nearly pure Au matrix, wavelength dispersive X-ray Fluorescence Spectrometry (WDXRF) has not yet been evaluated for this application. This paper demonstrates that Pt can be determined in gold coins with a limit of detection of 20 μg g−1 (k = 3). Typical relative standard deviations were observed to range from 2% to 3% for Pt determined in gold coins (at 326 and 339 μg g−1, respectively). The low bias created from the imprinted coin design raising the coin up (compared to a completely flat coin piece) was largely overcome by making a 50 μm trough in the sample cup to lower the coin relative to the X-ray tube to compensate for the coin design. Determined Pt concentrations on the side of the coin with the imprinted design were within +1 to −13% of the values obtained with the opposite side where the design was removed by polishing (measured in a normal sample cup) using the same XRF method. This method was deemed fit for purpose for historians wanting to track changes in Pt concentration in ancient Roman gold coins over long time intervals.

Funerary Speech for John Chrysostom

Liverpool University Press

This book offers the first English translation of the funerary speech for John Chyrsostom delivered by one of his former clergy in a city close to Constantinople in the autumn of 407 when news arrived of John’s death on a forced march in eastern Asia Minor. The speech is the earliest and fullest account of John’s activities as bishop of Constantinople between 397 and 404. It replaces the slightly later Historical Dialogue on John by Palladius as the prime source for John in Constantinople The translators are both Late Roman Historians, and their introduction and notes illustrate the importance of this new text, which was first edited critically and published as recently as 2007.

Comparison of Image Filters for Low Dose Neutron Imaging

Physics Procedia

Neutron imaging using low flux sources, such as accelerators or low flux nuclear reactors, produces images which contain significant amounts of noise. The noise indications are a result of high energy gamma radiation and some neutron scattering which hit the CCD detector despite heavy shielding. The amount of noise in an image is a factor of the exposure time required to produce images with adequate dynamic ranges. Minimization of noise and maximization of the dynamic range are inversely proportional and the exposure time is often extended to increase incident neutrons at the expense of noise. The resultant noise can be reduced using image filters; however, these filters usually increase the signal to noise ratio (SNR) at the expense of spatial resolution. Three filters were applied to low dose neutron images acquired at RMC; a median filter, a Z-projection filter and a hybrid PDE filter. The median filter and the hybrid PDE filter showed similar performance in 3D with regards to SNR and spatial resolution, however, the median filter created numerous artefacts in the resultant tomogram. The Z-projection filter using 5 projections had the best performance in 2D improving the SNR of the raw image from 10.2 ± 0.767 to 22.5 ± 1.52 and the spatial resolution from 331 ± 2.89 to 309 ± 0.846, respectively. The Z-projection filter was not evaluated in 3D due to facility induced constraints.

The First Brush: Paul Kane & Infrared Reflectography

ROM Press

This book is a unique insight into Paul Kane’s thinking and artistic processes between the years 1849 and 1856 as he painted in his Toronto studio. It explores the issue of truthfulness in Kane’s art and his struggle for composition. Additionally, these comparisons expose Kane’s response to external pressures, as well as his steadfastness to a realized vision.

Rock bench: Establishing a common repository and standards for assessing rockmass characteristics using LiDAR and photogrammetry.

Computers & Geosciences

Remote sensing methods are now used to assess rockmass characteristics along transportation corridors, in mines and tunnels, and in other areas where rock falls can affect humans and infrastructure. A variety of sensor methods, primarily LiDAR and photogrammetry, have seen recent use with widespread success and state of practice acceptance. Various commercial and custom tools exist to process the resulting data to extract geometry, surface and location based statistics, and to perform kinematic stability assessments. Although there is a widespread need to assess how different sensors and processing workflows actually perform, these are often compared anecdotally solely with the field practices they replace and using site and sensor data unavailable to other researchers. Two principles must be established to move across-the-board comparisons of remote rockmass characterization forward: (i) establishment of accessible, documented test sites, and (ii) test databases that are accessible to all. We propose the establishment of several key sites for equipment tests, including already-studied areas in Europe and North America, as well as an open approach to adding sites and related data to the collection. Site descriptions must include detailed local geology, photographs, LiDAR and/or photogrammetry datasets, and access notes. Second, we describe and provide a prototype data repository for storing this information, and in particular for providing open access to benchmark data into the future. This initiative will allow for meaningful comparisons of sensors and algorithms, and specifically will support better methodologies for benchmarking rock mass data in the geosciences. Data and metadata will be hosted at the www.rockbench.org domain.

The trial of Eutyches: A new interpretation.

Byzantinische Zeitschrift

A new interpretation of the ecclesiastical politics of the years 448 and 449 CE in Constantinople that contests the generally adopted position of Eduard Schwartz.

Gigapixel Imaging and Photogrammetry: Development of a New Long Range Remote Imaging Technique

Remote Sensing

The use of terrestrial remote imaging techniques, specifically LiDAR (Light Detection And Ranging) and digital stereo-photogrammetry, are widely proven and accepted for the mapping of geological structure and monitoring of mass movements. The use of such technologies can be limited, however: LiDAR generally by the cost of acquisition, and stereo-photogrammetry by the tradeoff between possible resolution within the scene versus the spatial extent of the coverage. The objective of this research is to test a hybrid gigapixel photogrammetry method, and investigate optimal equipment configurations for use in mountainous terrain. The scope of the work included field testing at variable ranges, angles, resolutions, and in variable geological and climatologically settings. Original field work was carried out in Canada to test various lenses and cameras, and detailed field mapping excursions were conducted in Norway. The key findings of the research are example data generated by gigapixel photogrammetry, a detailed discussion on optimal photography equipment for gigapixel imaging, and implementations of the imaging possibilities for rockfall mapping. This paper represents a discussion about a new terrestrial 3-dimensional imaging technique. The findings of this research will directly benefit natural hazard mapping programs in which rockfall potential must be recorded and the use of standard 3-dimensional imaging techniques cannot be applied.

The non-destructive determination of Pt in ancient Roman gold coins by XRF spectrometry

Journal of Analytical Atomic Spectrometry

The determination of trace concentrations of the platinum group elements in gold bullion can be significant for establishing the geographical location from which the gold was mined. Platinum is of particular importance for ancient gold as a marker of provenance. While many techniques have been used successfully to quantify Pt in a nearly pure Au matrix, wavelength dispersive X-ray Fluorescence Spectrometry (WDXRF) has not yet been evaluated for this application. This paper demonstrates that Pt can be determined in gold coins with a limit of detection of 20 μg g−1 (k = 3). Typical relative standard deviations were observed to range from 2% to 3% for Pt determined in gold coins (at 326 and 339 μg g−1, respectively). The low bias created from the imprinted coin design raising the coin up (compared to a completely flat coin piece) was largely overcome by making a 50 μm trough in the sample cup to lower the coin relative to the X-ray tube to compensate for the coin design. Determined Pt concentrations on the side of the coin with the imprinted design were within +1 to −13% of the values obtained with the opposite side where the design was removed by polishing (measured in a normal sample cup) using the same XRF method. This method was deemed fit for purpose for historians wanting to track changes in Pt concentration in ancient Roman gold coins over long time intervals.

Development of a neutron tomography system using a low flux reactor

Nuclear Instruments and Methods in Physics Research Section A: Accelerators, Spectrometers, Detectors and Associate Equipment

A neutron tomography instrument was designed and developed at the Royal Military College (RMC) of Canada with Queen's University to enhance these institutions' non-destructive evaluation capabilities. The neutron imaging system was built around a Safe Low-Power C(K)ritical Experiment (SLOWPOKE-2) nuclear research reactor. The low power and physical geometry of the reactor required that a novel design be developed to facilitate tomography. A unique rotisserie style rotary stage and clamping apparatus was developed. Furthermore, the low flux at the image plane (3×104 n cm−2 s−1), necessitated that the image acquisition and reconstruction processes be optimized. Tomographs of numerous samples were obtained using the new tomography instrument at RMC.

Funerary Speech for John Chrysostom

Liverpool University Press

This book offers the first English translation of the funerary speech for John Chyrsostom delivered by one of his former clergy in a city close to Constantinople in the autumn of 407 when news arrived of John’s death on a forced march in eastern Asia Minor. The speech is the earliest and fullest account of John’s activities as bishop of Constantinople between 397 and 404. It replaces the slightly later Historical Dialogue on John by Palladius as the prime source for John in Constantinople The translators are both Late Roman Historians, and their introduction and notes illustrate the importance of this new text, which was first edited critically and published as recently as 2007.

Comparison of Image Filters for Low Dose Neutron Imaging

Physics Procedia

Neutron imaging using low flux sources, such as accelerators or low flux nuclear reactors, produces images which contain significant amounts of noise. The noise indications are a result of high energy gamma radiation and some neutron scattering which hit the CCD detector despite heavy shielding. The amount of noise in an image is a factor of the exposure time required to produce images with adequate dynamic ranges. Minimization of noise and maximization of the dynamic range are inversely proportional and the exposure time is often extended to increase incident neutrons at the expense of noise. The resultant noise can be reduced using image filters; however, these filters usually increase the signal to noise ratio (SNR) at the expense of spatial resolution. Three filters were applied to low dose neutron images acquired at RMC; a median filter, a Z-projection filter and a hybrid PDE filter. The median filter and the hybrid PDE filter showed similar performance in 3D with regards to SNR and spatial resolution, however, the median filter created numerous artefacts in the resultant tomogram. The Z-projection filter using 5 projections had the best performance in 2D improving the SNR of the raw image from 10.2 ± 0.767 to 22.5 ± 1.52 and the spatial resolution from 331 ± 2.89 to 309 ± 0.846, respectively. The Z-projection filter was not evaluated in 3D due to facility induced constraints.

The First Brush: Paul Kane & Infrared Reflectography

ROM Press

This book is a unique insight into Paul Kane’s thinking and artistic processes between the years 1849 and 1856 as he painted in his Toronto studio. It explores the issue of truthfulness in Kane’s art and his struggle for composition. Additionally, these comparisons expose Kane’s response to external pressures, as well as his steadfastness to a realized vision.

Rock bench: Establishing a common repository and standards for assessing rockmass characteristics using LiDAR and photogrammetry.

Computers & Geosciences

Remote sensing methods are now used to assess rockmass characteristics along transportation corridors, in mines and tunnels, and in other areas where rock falls can affect humans and infrastructure. A variety of sensor methods, primarily LiDAR and photogrammetry, have seen recent use with widespread success and state of practice acceptance. Various commercial and custom tools exist to process the resulting data to extract geometry, surface and location based statistics, and to perform kinematic stability assessments. Although there is a widespread need to assess how different sensors and processing workflows actually perform, these are often compared anecdotally solely with the field practices they replace and using site and sensor data unavailable to other researchers. Two principles must be established to move across-the-board comparisons of remote rockmass characterization forward: (i) establishment of accessible, documented test sites, and (ii) test databases that are accessible to all. We propose the establishment of several key sites for equipment tests, including already-studied areas in Europe and North America, as well as an open approach to adding sites and related data to the collection. Site descriptions must include detailed local geology, photographs, LiDAR and/or photogrammetry datasets, and access notes. Second, we describe and provide a prototype data repository for storing this information, and in particular for providing open access to benchmark data into the future. This initiative will allow for meaningful comparisons of sensors and algorithms, and specifically will support better methodologies for benchmarking rock mass data in the geosciences. Data and metadata will be hosted at the www.rockbench.org domain.

The trial of Eutyches: A new interpretation.

Byzantinische Zeitschrift

A new interpretation of the ecclesiastical politics of the years 448 and 449 CE in Constantinople that contests the generally adopted position of Eduard Schwartz.

Gigapixel Imaging and Photogrammetry: Development of a New Long Range Remote Imaging Technique

Remote Sensing

The use of terrestrial remote imaging techniques, specifically LiDAR (Light Detection And Ranging) and digital stereo-photogrammetry, are widely proven and accepted for the mapping of geological structure and monitoring of mass movements. The use of such technologies can be limited, however: LiDAR generally by the cost of acquisition, and stereo-photogrammetry by the tradeoff between possible resolution within the scene versus the spatial extent of the coverage. The objective of this research is to test a hybrid gigapixel photogrammetry method, and investigate optimal equipment configurations for use in mountainous terrain. The scope of the work included field testing at variable ranges, angles, resolutions, and in variable geological and climatologically settings. Original field work was carried out in Canada to test various lenses and cameras, and detailed field mapping excursions were conducted in Norway. The key findings of the research are example data generated by gigapixel photogrammetry, a detailed discussion on optimal photography equipment for gigapixel imaging, and implementations of the imaging possibilities for rockfall mapping. This paper represents a discussion about a new terrestrial 3-dimensional imaging technique. The findings of this research will directly benefit natural hazard mapping programs in which rockfall potential must be recorded and the use of standard 3-dimensional imaging techniques cannot be applied.

The non-destructive determination of Pt in ancient Roman gold coins by XRF spectrometry

Journal of Analytical Atomic Spectrometry

The determination of trace concentrations of the platinum group elements in gold bullion can be significant for establishing the geographical location from which the gold was mined. Platinum is of particular importance for ancient gold as a marker of provenance. While many techniques have been used successfully to quantify Pt in a nearly pure Au matrix, wavelength dispersive X-ray Fluorescence Spectrometry (WDXRF) has not yet been evaluated for this application. This paper demonstrates that Pt can be determined in gold coins with a limit of detection of 20 μg g−1 (k = 3). Typical relative standard deviations were observed to range from 2% to 3% for Pt determined in gold coins (at 326 and 339 μg g−1, respectively). The low bias created from the imprinted coin design raising the coin up (compared to a completely flat coin piece) was largely overcome by making a 50 μm trough in the sample cup to lower the coin relative to the X-ray tube to compensate for the coin design. Determined Pt concentrations on the side of the coin with the imprinted design were within +1 to −13% of the values obtained with the opposite side where the design was removed by polishing (measured in a normal sample cup) using the same XRF method. This method was deemed fit for purpose for historians wanting to track changes in Pt concentration in ancient Roman gold coins over long time intervals.

Development of a neutron tomography system using a low flux reactor

Nuclear Instruments and Methods in Physics Research Section A: Accelerators, Spectrometers, Detectors and Associate Equipment

A neutron tomography instrument was designed and developed at the Royal Military College (RMC) of Canada with Queen's University to enhance these institutions' non-destructive evaluation capabilities. The neutron imaging system was built around a Safe Low-Power C(K)ritical Experiment (SLOWPOKE-2) nuclear research reactor. The low power and physical geometry of the reactor required that a novel design be developed to facilitate tomography. A unique rotisserie style rotary stage and clamping apparatus was developed. Furthermore, the low flux at the image plane (3×104 n cm−2 s−1), necessitated that the image acquisition and reconstruction processes be optimized. Tomographs of numerous samples were obtained using the new tomography instrument at RMC.

Nestorius of Constantinople

The Wiley-Blackwell Companion to Patristics, Ken Parry (ed.)