91 research outputs found
Clayburn Creek watercourse assessment: development and stream management in an urban residential area
The Clayburn Creek watershed, Abbotsford, British Columbia has undergone numerous changes in the recent past. These changes have dramatically increased the number of high water flow events. High flow events on this fish bearing stream are causing increased erosion along the stream channel increasing the sediment load of the stream. These events can be correlated to increasing development and population growth upstream from Clayburn Village within the Clayburn Creek watershed. Mapping of the stream course with a Trimble GPS along with the plotting of numerous cross sections across the stream channel will allow the researchers to determine if any changes are occurring within the stream channel in the future. Measurement of precipitation and stream turbidity values will allow the monitoring of rainfall events and their impact on the watershed. With developments being expanded and new developments being planned for upstream locations it is necessary to document the present state of the watershed and to collect baseline data. This knowledge if used to assist in the implementation of effective mitigation practices may alleviate future flood events from impacting historic Clayburn Village
Noticing for Equity to Sustain Multilingual Literacies
This department explores how teachers can sustain students’ multilingual literacies and reimagine literacy learning across multiple contexts in conversation with researchers, practitioners, and communities
Quintessential Maldacena-Maoz Cosmologies
Maldacena and Maoz have proposed a new approach to holographic cosmology
based on Euclidean manifolds with disconnected boundaries. This approach
appears, however, to be in conflict with the known geometric results [the
Witten-Yau theorem and its extensions] on spaces with boundaries of
non-negative scalar curvature. We show precisely how the Maldacena-Maoz
approach evades these theorems. We also exhibit Maldacena-Maoz cosmologies with
[cosmologically] more natural matter content, namely quintessence instead of
Yang-Mills fields, thereby demonstrating that these cosmologies do not depend
on a special choice of matter to split the Euclidean boundary. We conclude that
if our Universe is fundamentally anti-de Sitter-like [with the current
acceleration being only temporary], then this may force us to confront the
holography of spaces with a connected bulk but a disconnected boundary.Comment: Much improved exposition, exponent in Cai-Galloway theorem fixed,
axionic interpretation of scalar explained, JHEP version. 33 pages, 3 eps
figure
On the D3-brane description of some 1/4 BPS Wilson loops
Recently it has been proposed that Wilson loops in high-dimensional
representations in N=4 supersymmetric Yang-Mills theory (or multiply wrapped
loops) are described by D-branes in AdS_5 x S^5, rather than by fundamental
strings. Thus far explicit D3-brane solutions have been only found in the case
of the half-BPS circle or line. Here we present D3-brane solutions describing
some 1/4 BPS loops. In one case, where the loop is conjectured to be given by a
Gaussian matrix model, the action of the brane correctly reproduces the
expectation value of the Wilson loop including all 1/N corrections at large
\lambda. As in the corresponding string solution, here too we find two
classical solutions, one stable and one not. The unstable one contributes
exponentially small corrections that agree with the matrix model calculation.Comment: 26 pages, 1 figure; v2: minor change
The parent?infant dyad and the construction of the subjective self
Developmental psychology and psychopathology has in the past been more concerned with the quality of self-representation than with the development of the subjective agency which underpins our experience of feeling, thought and action, a key function of mentalisation. This review begins by contrasting a Cartesian view of pre-wired introspective subjectivity with a constructionist model based on the assumption of an innate contingency detector which orients the infant towards aspects of the social world that react congruently and in a specifically cued informative manner that expresses and facilitates the assimilation of cultural knowledge. Research on the neural mechanisms associated with mentalisation and social influences on its development are reviewed. It is suggested that the infant focuses on the attachment figure as a source of reliable information about the world. The construction of the sense of a subjective self is then an aspect of acquiring knowledge about the world through the caregiver's pedagogical communicative displays which in this context focuses on the child's thoughts and feelings. We argue that a number of possible mechanisms, including complementary activation of attachment and mentalisation, the disruptive effect of maltreatment on parent-child communication, the biobehavioural overlap of cues for learning and cues for attachment, may have a role in ensuring that the quality of relationship with the caregiver influences the development of the child's experience of thoughts and feelings
Detectable clonal mosaicism and its relationship to aging and cancer
In an analysis of 31,717 cancer cases and 26,136 cancer-free controls from 13 genome-wide association studies, we observed large chromosomal abnormalities in a subset of clones in DNA obtained from blood or buccal samples. We observed mosaic abnormalities, either aneuploidy or copy-neutral loss of heterozygosity, of >2 Mb in size in autosomes of 517 individuals (0.89%), with abnormal cell proportions of between 7% and 95%. In cancer-free individuals, frequency increased with age, from 0.23% under 50 years to 1.91% between 75 and 79 years (P = 4.8 × 10(-8)). Mosaic abnormalities were more frequent in individuals with solid tumors (0.97% versus 0.74% in cancer-free individuals; odds ratio (OR) = 1.25; P = 0.016), with stronger association with cases who had DNA collected before diagnosis or treatment (OR = 1.45; P = 0.0005). Detectable mosaicism was also more common in individuals for whom DNA was collected at least 1 year before diagnosis with leukemia compared to cancer-free individuals (OR = 35.4; P = 3.8 × 10(-11)). These findings underscore the time-dependent nature of somatic events in the etiology of cancer and potentially other late-onset diseases
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