Surface velocity fields, digital elevation models, ice front positions and grounding line derived from remote sensing data at Dinsmoor-Bombardier-Edgeworth glacier system, Antarctic Peninsula (1992-2014)

The northern Antarctic Peninsula is one of the fastest changing regions on Earth. The disintegration of the Larsen-A Ice Shelf in 1995 caused tributary glaciers to adjust by speeding up, surface lowering, and overall increased ice-mass discharge. In this study, we investigate the temporal variation of these changes at the Dinsmoor-Bombardier-Edgeworth glacier system by analyzing dense time series from various spaceborne and airborne Earth observation missions. Precollapse ice shelf conditions and subsequent adjustments through 2014 were covered. Our results show a response of the glacier system some months after the breakup, reaching maximum surface velocities at the glacier front of up to 8.8 m/d in 1999 and a subsequent decrease to ~1.5 m/d in 2014. Using a dense time series of interferometrically derived TanDEM-X digital elevation models and photogrammetric data, an exponential function was fitted for the decrease in surface elevation. Elevation changes in areas below 1000 m a.s.l. amounted to at least 130±15 m130±15 m between 1995 and 2014, with change rates of ~3.15 m/a between 2003 and 2008. Current change rates (2010-2014) are in the range of 1.7 m/a. Mass imbalances were computed with different scenarios of boundary conditions. The most plausible results amount to -40.7±3.9 Gt-40.7±3.9 Gt. The contribution to sea level rise was estimated to be 18.8±1.8 Gt18.8±1.8 Gt, corresponding to a 0.052±0.005 mm0.052±0.005 mm sea level equivalent, for the period 1995-2014. Our analysis and scenario considerations revealed that major uncertainties still exist due to insufficiently accurate ice-thickness information. The second largest uncertainty in the computations was the glacier surface mass balance, which is still poorly known. Our time series analysis facilitates an improved comparison with GRACE data and as input to modeling of glacio-isostatic uplift in this region. The study contributed to a better understanding of how glacier systems adjust to ice shelf disintegration.

Two young women protest against Long Island Press for discriminating against women and female paper carrier positions

General note: Title and date provided by Bettye Lane.

La relation entre les positions du tronc et les stratégies motrices utilisées par les personnes hémiparétiques lors du passage de la position assise à debout

Mémoire numérisé par la Direction des bibliothèques de l'Université de Montréal.

La relation entre les positions du tronc et les stratégies motrices utilisées par les personnes hémiparétiques lors du passage de la position assise à debout

Mémoire numérisé par la Direction des bibliothèques de l'Université de Montréal.

Particle positions of numerical experiments 1 to 4

In mixed sediment beds, erosion resistance can change relative to that of beds composed of a uniform sediment because of varying textural and/or other grain-size parameters, with effects on pore water flow that are difficult to quantify by means of analogue techniques. To overcome this difficulty, a three-dimensional numerical model was developed using a finite difference method (FDM) flow model coupled with a distinct element method (DEM) particle model. The main aim was to investigate, at a high spatial resolution, the physical processes occurring during the initiation of motion of single grains at the sediment-water interface and in the shallow subsurface of simplified sediment beds under different flow velocities. Increasing proportions of very fine sand (D50=0.08 mm) were mixed into a coarse sand matrix (D50=0.6 mm) to simulate mixed sediment beds, starting with a pure coarse sand bed in experiment 1 (0 wt% fines), and proceeding through experiment 2 (6.5 wt% fines), experiment 3 (10.5 wt% fines), and experiment 4 (28.7 wt% fines). All mixed beds were tested for their erosion behavior at predefined flow velocities varying in the range of U 1-5=10-30 cm/s. The experiments show that, with increasing fine content, the smaller particles increasingly fill the spaces between the larger particles. As a consequence, pore water inflow into the sediment is increasingly blocked, i.e., there is a decrease in pore water flow velocity and, hence, in the flow momentum available to entrain particles. These findings are portrayed in a new conceptual model of enhanced sediment bed stabilization.

From Where Do We Teach? Potential Positions in Public Education

This thesis is a conceptual examination of the positions from which we teach in public education. As it is philosophical in nature, it takes no qualitative or quantitative data. It offers a review of selected relevant literature and an analysis of personal and professional experience, with the intent to pose critical questions about teaching and learning. The framework of this thesis represents the following contentions: First, from its inception, public schooling served capital by preparing skilled labour for emerging industrial markets. This history is the hegemonic shadow that hangs over public education today. Second, movements toward the standardization of funding, curriculum, and evaluation support the further commodification of public schooling. The “accountability” that standardization offers, the “back to basics” that it aims for, is counter to the potential that public education might critically inform citizens and seek social justice. Third, movements toward the privatization of public schooling under the guise of “choice” and “mobility”, brought on by manufactured crisis, serve only to widen socio-economic inequities as capitalist neoliberal interests seek profit in both the product of public schools and in schooling itself. If we recognize and understand the power of public education to inform vast numbers of citizens who will, in turn, either maintain or reform society, we must ask: What do we want public education to be? What are the effects of continuing down historically conventional and increasingly standardized paths? What do progressive pedagogies offer? How might teachers destandardize their pedagogy and pursue equitable opportunities for marginalized students? How might students name themselves and their world, that they might play a part in its reimagining? For whom do we teach, and under what conditions? From where do we teach, and why? For educators to ask these questions, and to employ what they discover, will necessitate taking substantial risks. It will necessitate taking a stand and cannot be done alone. Teachers must seek out the collaboration of their students. They must offer students the time and the space to find their own voices, to create their own selves, and to envision previously uncharted paths on which we might walk together.

Extended Energy Vector Prediction of Ambisonically Reproduced Image Direction at Off-Centre Listening Positions

This paper presents an extension to the energy vector, well known in the Ambisonics literature, to improve its predictions of localisation at off-centre listening positions. In determining the source direction, a perceptual weight is assigned to each loudspeaker gain, taking into account the relative arrival times, levels, and directions of the loudspeaker signals. The proposed model is evaluated alongside the original energy vector and two binaural models through comparison with the results of recent perceptual studies. The extended version was found to provide results that were at least 50% more accurate than the second best predictor for two experiments involving off-centre listeners with first- and third-order Ambisonics systems.

Aerobic and anaerobic test performance among elite male football players in different team positions

The purpose was to determine the magnitude of aerobic and anaerobic performance factors among elite male football players in different team positions. Thirty-nine players from the highest Swedish division classified as defenders (n=18), midfield players (n=12) or attackers (n=9) participated. Their mean (± sd) age, height and body mass (bm) were 24.4 (±4.7) years, 1.80 (±5.9)m and 79 (±7.6)kg, respectively. Running economy (RE) and anaerobic threshold (AT) was determined at 10, 12, 14, and 16km/h followed by tests of maximal oxygen uptake (VO2max). Maximal strength (1RM) and average power output (AP) was performed in squat lifting. Squat jump (SJ), counter-movement jump with free arm swing (CMJa), 45m maximal sprint and the Wingate test was performed. Average VO2max for the whole population (WP) was 57.0mL O2•kg-1min-1 . The average AT occurred at about 84% of VO2max. 1RM per kg bm0.67 was 11.9±1.3kg. Average squat power in the whole population at 40% 1RM was 70±9.5W per kg bm0.67 . SJ and CMJa were 38.6±3.8cm and 48.9±4.4cm, respectively. The average sprint time (45m) was 5.78± 0.16s. The AP in the Wingate test was 10.6±0.9W•kg-1 . The average maximal oxygen uptake among players in the highest Swedish division was lower compared to international elite players but the Swedish players were better off concerning the anaerobic threshold and in the anaerobic tests. No significant differences were revealed between defenders, midfielders or attackers concerning the tested parameters presented above.

Aerobic and anaerobic test performance among elite male football players in different team positions

The purpose was to determine the magnitude of aerobic and anaerobic performance factors among elite male football players in different team positions. Thirty-nine players from the highest Swedish division classified as defenders (n=18), midfield players (n=12) or attackers (n=9) participated. Their mean (± sd) age, height and body mass (bm) were 24.4 (±4.7) years, 1.80 (±5.9)m and 79 (±7.6)kg, respectively. Running economy (RE) and anaerobic threshold (AT) was determined at 10, 12, 14, and 16km/h followed by tests of maximal oxygen uptake (VO2max). Maximal strength (1RM) and average power output (AP) was performed in squat lifting. Squat jump (SJ), counter-movement jump with free arm swing (CMJa), 45m maximal sprint and the Wingate test was performed. Average VO2max for the whole population (WP) was 57.0mL O2•kg-1min-1. The average AT occurred at about 84% of VO2max. 1RM per kg bm0.67 was 11.9±1.3kg. Average squat power in the whole population at 40% 1RM was70±9.5W per kg bm0.67. SJ and CMJa were 38.6±3.8cm and 48.9±4.4cm,respectively. The average sprint time (45m) was 5.78± 0.16s. The AP in the Wingate test was 10.6±0.9W•kg-1. The average maximal oxygen uptake among players in the highest Swedish division was lower compared to international elite players but the Swedish players were better off concerning the anaerobic threshold and in the anaerobic tests. No significant differences were revealed between defenders, midfielders or attackers concerning the tested parameters presented above.

The Search for the Operatic: Bridging the Gap Between the Spectatorial and Performer Positions Through Sketch-making and Embodiment Techniques

The exhibition was of sketches and a photograph from my PhD practice research. The practice-research was comprised of observing opera singers in rehearsal and sketching them as they moved. As well as records of body position, and to some degree dynamic flow, the exhibited sketches were regarded as kinaesthetic responses in and of themselves – responses to the environment of the rehearsal, in particular responding to the sounds of the orchestra. These sketches were, in part, generated through an embodiment of the music, which was occurring in the same moment as the singer was engaged in embodying the music. These sketches were then used as tools that therefore contained kinaesthetic information which could be unlocked through a process of Butoh derived embodiment techniques alongside reference to the sketched image. This ultimately allowed me to move from a spectatorial position to a performance maker position, bringing a sense of the operatic into the non-singing body, whether that was my own or the bodies of other performers. In this way, and combined with rigorous observation of the corporeal restrictions of singing operatically, choreographies were created that employed operatic ways of moving in non-singing bodies and the operatic was extracted from opera and employed in movement based practice. The aspect of the practice-research exhibited is the correspondence between sketched documentation of the singers in rehearsal and photographic documentation of the dancer (researcher) in performance.

Sketch showing the positions of the redoubts and batteries of the lines of the U.S. Forces in front of Petersburg /

Shows fortifications and names of some residents.