7,830 research outputs found
Further studies of the coupled chemically reacting boundary layer and charring ablator. Part 1 - Summary Final report
Computer program development for charring ablative materials, chemically reacting laminar boundary layers, and turbulent boundary layer initiatio
Laboratory guide to early life history stages of northeast Pacific fishes
This laboratory guide presents taxonomic information on eggs
and larvae of fishes of the Northeast Pacific Ocean (north of California) and the eastern Bering Sea. Included are early-life-history series, illustrations, and comparative descriptions of 232 species expected to spawn here, out of a total 627 species known to occur in marine waters of this area. Meristic and general life-history data are included, as well as diagnostic characters to help identify eggs and larvae. Most of this information has been gleaned from literature, with the addition of 200 previously unpublished illustrations. (PDF file contains 654 pages.
Calculation of three-dimensional compressible laminar and turbulent boundary flows. Three-dimensional compressible boundary layers of reacting gases over realistic configurations
A three-dimensional boundary-layer code was developed for particular application to realistic hypersonic aircraft. It is very general and can be applied to a wide variety of boundary-layer flows. Laminar, transitional, and fully turbulent flows of compressible, reacting gases are efficiently calculated by use of the code. A body-oriented orthogonal coordinate system is used for the calculation and the user has complete freedom in specifying the coordinate system within the restrictions that one coordinate must be normal to the surface and the three coordinates must be mutually orthogonal
Understanding the measurement of hunger and food insecurity in the elderly
The elderly are one of the population subgroups at greatest risk for hunger and food insecurity. To date, no accurate measures of this problem have been developed. What is needed are a thorough understanding of the phenomenon, and an assessment of how the elderly perceive and answer items commonly used to measure hunger and food insecurity in other subgroups. In-depth, open-ended interviews were conducted with forty-one low-income urban black and rural white residents of upstate New York. Results suggest a conceptual framework of food insecurity in the elderly with two significant differences from frameworks proposed for younger families: the major role of health problems and physical disabilities, and the impact of personal history on perceptions of food insecurity. In a telephone follow-up (approximately six months after the initial interviews) twenty-four respondents were asked commonly used food insecurity questionnaire items from six different sources. Results suggest that hunger and food insecurity among the elderly can be measured directly. The commonly used measures tested here will help categorize the stages of food insecurity. However, these direct measures might underestimate the prevalence of food insecurity because of a perceived reluctance to report problems with food.
Dynamic filtering of static dipoles in magnetoencephalography
We consider the problem of estimating neural activity from measurements
of the magnetic fields recorded by magnetoencephalography. We exploit
the temporal structure of the problem and model the neural current as a
collection of evolving current dipoles, which appear and disappear, but whose
locations are constant throughout their lifetime. This fully reflects the physiological
interpretation of the model.
In order to conduct inference under this proposed model, it was necessary
to develop an algorithm based around state-of-the-art sequential Monte
Carlo methods employing carefully designed importance distributions. Previous
work employed a bootstrap filter and an artificial dynamic structure
where dipoles performed a random walk in space, yielding nonphysical artefacts
in the reconstructions; such artefacts are not observed when using the
proposed model. The algorithm is validated with simulated data, in which
it provided an average localisation error which is approximately half that of
the bootstrap filter. An application to complex real data derived from a somatosensory
experiment is presented. Assessment of model fit via marginal
likelihood showed a clear preference for the proposed model and the associated
reconstructions show better localisation
Design and commissioning of a directly coupled in-vivo multiphoton microscope for skin imaging in humans and large animals
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Self-care after traumatic injury and the use of the therapeutic self care scale in trauma populations
Aims: To report a correlational study of the relationship between gender, age, severity of injury, length of hospital stay and self-care behaviour in patients with traumatic injuries.
Background: This study may provide a foundation for targeted nursing intervention and education programmes to help patients better recover from their injury, which is a fundamental aspect of nursing.
Design: A longitudinal cohort study.
Method: This study of patients hospitalized for traumatic injury was conducted from May 2006âNovember 2007. The Therapeutic Self Care Scale along with demographic and clinical data, were completed at 3 and 6 months after hospital discharge. Using data from the 3-month survey, the validity and reliability of the scale was calculated. Multiple regression was used to identify predictors of self-care at 3 and 6 months.
Finding: Participants (n = 125) completed the questionnaire at 3 months and 103 participants completed it at 6 months. Self-care was high on both occasions and high self-care at 3 months was related to high self-care at 6 months. Older participants reported higher self-care at 3 months compared with younger patients. Factor analysis of the scale revealed three clear components; taking medication, recognition and managing symptoms and managing changes in health conditions, which explained a total of 59·8% of the variance. The 10-item revised scale was reliable.
Conclusion: The findings indicate that self-care remains fairly high and stable in the first 6 months after trauma. The revised Therapeutic Self Care Scale was valid and reliable in the trauma population
Performance Evaluation and Optimization of Math-Similarity Search
Similarity search in math is to find mathematical expressions that are
similar to a user's query. We conceptualized the similarity factors between
mathematical expressions, and proposed an approach to math similarity search
(MSS) by defining metrics based on those similarity factors [11]. Our
preliminary implementation indicated the advantage of MSS compared to
non-similarity based search. In order to more effectively and efficiently
search similar math expressions, MSS is further optimized. This paper focuses
on performance evaluation and optimization of MSS. Our results show that the
proposed optimization process significantly improved the performance of MSS
with respect to both relevance ranking and recall.Comment: 15 pages, 8 figure
Further studies of the coupled chemically reacting boundary layer and charring ablator. Part 4 - Nonsimilar solution of an incompressible turbulent boundary layer by an integral matrix method
Nonsimilar solution of incompressible turbulent boundary layer by integral matrix metho
Letter from W. M. Kendall, New York City, New York, to Anne Whitney, Boston, Massachusetts, 1900 May 31
https://repository.wellesley.edu/whitney_correspondence/2666/thumbnail.jp
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