Connecting GRBs and galaxies: the probability of chance coincidence

Studies of GRB host galaxies are crucial to understanding GRBs. However, since they are identified by the superposition in the plane of the sky of a GRB afterglow and a galaxy there is always a possibility that an association represents a chance alignment, rather than a physical connection. We examine a uniform sample of 72 GRB fields to explore the probability of chance superpositions. There is typically a ~1% chance that an optical afterglow will coincide with a galaxy by chance. While spurious host galaxy detections will, therefore, be rare, the possibility must be considered when examining individual GRB/host galaxy examples. It is also tempting to use the large and uniform collection of X-ray afterglow positions to search for GRB-associated galaxies. However, we find that approximately half of the 14 superpositions in our sample are likely to occur by chance, so in the case of GRBs localized only by an X-ray afterglow, even statistical studies are suspect.Comment: edited, accepted by Ap

Configuration Sharing Optimized Placement and Routing

Reconfigurable systems have been shown to achieve very high computational performance. However, the overhead associated with reconfiguration of hardware remains a critical factor in overall system performance. This paper discusses the development and evaluation of a technique to minimize the delay associated with reconfiguration based upon optimized sharing of configuration bit streams between design contexts. This is achieved through modified placement and routing algorithms

A Comparison of Video and Accelerometer Based Approaches Applied to Performance Monitoring in Swimming.

The aim of this paper is to present a comparison of video- and sensor based studies of swimming performance. The video-based approach is reviewed and contrasted to the newer sensor-based technology, specifically accelerometers based upon Micro-Electro-Mechanical Systems (MEMS) technology. Results from previously published swim performance studies using both the video and sensor technologies are summarised and evaluated against the conventional theory that upper arm movements are of primary interest when quantifying free-style technique. The authors conclude that multiple sensor-based measurements of swimmers’ acceleration profiles have the potential to offer significant advances in coaching technique over the traditional video based approach

Research, development and application of noncombustible Beta fiber structures

Beta fiber was selected as the primary material for flexible fibrous structures used in spacecraft and crew systems applications in the Apollo program because it was noncombustible in a 100 percent oxygen atmosphere up to 16.5 psia. It met NASA criteria for outgassing, toxicity, odor, and crew comfort, and possessed sufficient durability to last through the mission. Topics discussed include: study of spacecraft applications; design of Beta fiber textile structures to meet the requirements; selection of surface treatments (finishes, coatings, and printing systems) to impart the required durability and special functional use to the textile structures; development of sewing and fabrication techniques; and testing and evaluation programs, and development of production sources

Development of a low profile laser Doppler probe for monitoring perfusion at the patient – mattress interface

The clinical importance of pressure ulcers is reviewed confirming the need for continuous monitoring of skin blood perfusion at the patient – mattress interface. The design of a low profile (H≈1mm) laser Doppler probe is then described together with the experimental setup used for evaluation. The results show that the performance of the new sensor does not vary significantly from that of currently available probes over a wide range of operating parameters. The authors conclude that the sensor design provides a low cost perfusion monitoring solution with potential to significantly reduce the risk of bed sores in hospital patients

Sensors for triggering practical Functional Electrical Stimulation walking systems

Functional Electrical Stimulation (FES) techniques have shown significant improvement in mobility and functionality to many patients with pathological gait resulting from upper motor neurological injuries such as stroke, Multiple Sclerosis (MS), etc. Effective functioning of FES walking systems relies on accurate and reliable detection of gait events (i.e heel rise and heel strike) which depends on the type of sensors and the detection algorithm used

Late Middle Woodland Settlement and Subsistence Patterns in the Eastern Highland Rim of Tennessee

The Owl Hollow phase, a late Middle Woodland tradition, is identified in the upper Duck and Elk river valleys in the Eastern Highland Rim of south-central Tennessee. This hunter-gatherer and horticultural adaptation is documented with the material remains and features associated with eight large intensively occupied sites located in the main river valleys along minor tributary streams that drain the Highland Rim. Forty radiocarbon and eight archaeomagnetic dates indicate a temporal range of about A.D. 200-650 for the late Middle Woodland Owl Hollow phase. The recovery of contemporaneous warm and cold season structures and a variety of associated seasonality data provides evidence that the Owl Hollow phase sites were occupied as year-round villages. The villages are delineated by organic-enriched middens that often occur in a circular pattern around a debris-free area that may have functioned as a plaza. A community pattern of one (or more) double earth oven winter lodges and contiguous light- framed circular or oval summer structures was revealed on four of the eight Owl Hollow sites excavated. The analysis of floral and faunal materials indicates that subsistence was based primarily on hunting, fishing, and shellfish collecting, and on the gathering of arboreal hickory nuts, acorns, and herbaceous seeds. Squash/gourd, sunflower, and maize were cultivated and possibly contributed significantly to the Owl Hollow phase diet. The increased utilization of cultigens may have influenced the locality and the permanency of sites in the lowlands adjacent to large areas of alluvial soil. The cultural materials diagnostic of the Owl Hollow phase are lanceolate, spike-shaped projectile points, and limestone and limestone/chert-tempered plain and stamped pottery. The analysis and typological comparison of these material remains suggests that both cultural continuity and change occurred during the Owl Hollow phase. The chronometric dates, which form three clusters, lend support to early, middle, and late periods of cultural development and occupation of Owl Hollow phase sites. The separate periods are distinguishable by relative frequencies of diagnostic cultural materials, changes in subsistence patterns, and variations in settlement locations

Talks From The Bible: Why The Church Means So Much?

https://digitalcommons.acu.edu/crs_books/1472/thumbnail.jp