318 research outputs found
ADOLPH STEUTERMAN AND ORGAN REPERTOIRE IN EARLY-TWENTIETH-CENTURY AMERICA, 1921-1924
Lensch, Kristin Marie. DMA. The University of Memphis. December, 2020. Adolph Steuterman and Organ Repertoire in Early-Twentieth-Century America, April 1921-June 1924. Major Professor: Dr. Kenneth Kreitner.This dissertation examines the organ repertoire played by the early-twentieth-century church organist, Adolph Steuterman, at Calvary Episcopal Church, Memphis, Tennessee. Very little is known about the repertoire of the American church musician working at this time. Chapter one gives an overview of Steutermans musical training. Chapter two details the context of organ music in the early twentieth century and defines the four categories of repertoire: Classics, Contemporary Works, Characteristics and Exotics, and Transcriptions. Chapters three, four, five and six provide brief analyses of the individual categories of repertoire by examining representative pieces. The Appendices give a full listing of the repertoire, organized alphabetically by composer, by category, and by the number of times played. The study aims to offer a broader awareness of the repertoire used weekly in a prominent mainline Protestant church, situated in a larger city in the early twentieth century, by examining the detailed journal, dated April 1921-June 1924, of the successful young organist, Adolph Steuterman
3D Acquisition of Mirroring Objects using Striped Patterns
Objects with mirroring optical characteristics are left out of the scope of most 3D scanning methods. We present here a new automatic acquisition approach, shape-from-distortion, that focuses on that category of objects, requires only a still camera and a color monitor, and produces range scans (plus a normal and a reflectance map) of the target. Our technique consists of two steps: first, an improved environment matte is captured for the mirroring object, using the interference of patterns with different frequencies to obtain sub-pixel accuracy. Then, the matte is converted into a normal and a depth map by exploiting the self-coherence of a surface when integrating the normal map along different paths. The results show very high accuracy, capturing even smallest surface details. The acquired depth maps can be further processed using standard techniques to produce a complete 3D mesh of the object
Temperature dependent photoluminescence of single CdS nanowires
Temperature dependent photoluminescence (PL) is used to study the electronic
properties of single CdS nanowires. At low temperatures, both near-band edge
(NBE) photoluminescence (PL) and spatially-localized defect-related PL are
observed in many nanowires. The intensity of the defect states is a sensitive
tool to judge the character and structural uniformity of nanowires. As the
temperature is raised, the defect states rapidly quench at varying rates
leaving the NBE PL which dominates up to room temperature. All PL lines from
nanowires follow closely the temperature-dependent band edge, similar to that
observed in bulk CdS.Comment: 11 pages, 4 figure
Low temperature photoluminescence imaging and time-resolved spectroscopy of single CdS nanowires
Time-resolved photoluminescence (PL) and micro-PL imaging were used to study
single CdS nanowires at 10 K. The low-temperature PL of all CdS nanowires
exhibit spectral features near energies associated with free and bound exciton
transitions, with the transition energies and emission intensities varying
along the length of the nanowire. In addition, several nanowires show spatially
localized PL at lower energies which are associated with morphological
irregularities in the nanowires. Time-resolved PL measurements indicate that
exciton recombination in all CdS nanowires is dominated by non-radiative
recombination at the surface of the nanowires.Comment: 9 pages, 3 figures, to be published in Applied Physics Letter
Data Fusion of Objects Using Techniques Such as Laser Scanning, Structured Light and Photogrammetry for Cultural Heritage Applications
In this paper we present a semi-automatic 2D-3D local registration pipeline
capable of coloring 3D models obtained from 3D scanners by using uncalibrated
images. The proposed pipeline exploits the Structure from Motion (SfM)
technique in order to reconstruct a sparse representation of the 3D object and
obtain the camera parameters from image feature matches. We then coarsely
register the reconstructed 3D model to the scanned one through the Scale
Iterative Closest Point (SICP) algorithm. SICP provides the global scale,
rotation and translation parameters, using minimal manual user intervention. In
the final processing stage, a local registration refinement algorithm optimizes
the color projection of the aligned photos on the 3D object removing the
blurring/ghosting artefacts introduced due to small inaccuracies during the
registration. The proposed pipeline is capable of handling real world cases
with a range of characteristics from objects with low level geometric features
to complex ones
Reflectance from images: a model-based approach for human faces
In this paper, we present an image-based framework that acquires the reflectance properties of a human face. A range scan of the face is not required. Based on a morphable face model, the system estimates the 3D shape, and establishes point-to-point correspondence across images taken from different viewpoints, and across different individuals' faces. This provides a common parameterization of all reconstructed surfaces that can be used to compare and transfer BRDF data between different faces. Shape estimation from images compensates deformations of the face during the measurement process, such as facial expressions. In the common parameterization, regions of homogeneous materials on the face surface can be defined a-priori. We apply analytical BRDF models to express the reflectance properties of each region, and we estimate their parameters in a least-squares fit from the image data. For each of the surface points, the diffuse component of the BRDF is locally refined, which provides high detail. We present results for multiple analytical BRDF models, rendered at novelorientations and lighting conditions
Observation of Space-Charge-Limited Transport in InAs Nanowires
Recent theory and experiment have suggested that space-charge-limited
transport should be prevalent in high aspect-ratio semiconducting nanowires. We
report on InAs nanowires exhibiting this mode of transport and utilize the
underlying theory to determine the mobility and effective carrier concentration
of individual nanowires, both of which are found to be diameter-dependent.
Intentionally induced failure by Joule heating supports the notion of
space-charge-limited transport and proposes reduced thermal conductivity due to
the nanowires polymorphism
Impedance model for a high-temperature ceramic humidity sensor
We present an equivalent circuit model for a titanium dioxide-based humidity
sensor which enables discrimination of three separate contributions to the
sensor impedance. The first contribution, the electronic conductance,
consists of a temperature-dependent ohmic resistance. The second contribution
arises from the ionic pathway, which forms depending on the relative humidity
on the sensor surface. It is modeled by a constant-phase element (CPE) in
parallel with an ohmic resistance. The third contribution is the capacitance
of the double layer which forms at the blocking electrodes and is modeled by
a second CPE in series to the first CPE. This model was fitted to
experimental data between 1 mHz and 1 MHz recorded at different sensor
temperatures (between room temperature and 320 âC) and different
humidity levels. The electronic conductance becomes negligible at low sensor
temperatures, whereas the double-layer capacitance becomes negligible at high
sensor temperatures in the investigated frequency range. Both the
contribution from the ionic pathway and from the double-layer capacitance
strongly depend on the relative humidity and are, therefore, suitable sensor
signals. The findings define the parameters for the development of a
dedicated Fourier-based impedance spectroscope with much faster acquisition
times, paving a way for impedance-based high-temperature humidity sensor
systems.</p
- âŠ