4,149 research outputs found
A three dimensional vortex wake model for missiles at high angles on attack
A three dimensional model for the steady flow past missile and aircraft nose shaped bodies is presented based on augmenting a potential solution with a wake composed of vortex filaments. The vortex positions are determined by the requirement that they, in some sense, align with the flow. The aerodynamic loads on the body are compared with experimental values and used to evaluate the model. The vortex positions compare well with flow visualization results for slender bodies at high angles of attack. The approximations in the wake near the body cause peaks in the force distributions more severe than in the measured values. For given vortex strengths and body attachment points multiple steady vortex positions were not found
EC55-100 Questions and Answers about The Clean Wheat Program
Extension Circular 55-100 Questions and Answers About The Clean Wheat Program. This pamphlet contains 14 questions and answers about the clean wheat program and how it will be run
Characteristics of Effective Teaching in Canadian Universities- An Analysis based on the Testimony of a Thousand Graduates
A thousand graduates of nineteen Canadian universities, in a variety of disciplines, re- sponded to an invitation to name the professors they remembered as excellent teachers and to say why. Analyses of their comments reveal what they considered to be characteristics of effective university teaching. Comparisons of various sub-groups suggest that there are some differences in the patterns of good teaching between anglophone and francophone faculties and between fields of studyâhumanities, social sciences, biological sciences and physical sciencesâbut the patterns are basically similar in most university settings
Exploring Buddhism as a âToolâ to Support Well-Being: An Interpretative Phenomenological Analysis of Western Adoptersâ Experiences
Buddhism is an ancient religion and philosophy of living that is practised worldwide. More recent interest in mindfulness as a practice and intervention in the West has highlighted Buddhist-derived concepts as useful in supporting health and well-being. As a result, the desire to understand Buddhism in its more complete form has strengthened. Although research into mindfulness and compassion is growing, there is a new interest in second-generation mindfulness, i.e. interventions that draw upon a more holistic use of Buddhist practices. To date, little research has explored this in Western contexts. For the current study, Nichiren Buddhists from the United Kingdom who had been practising for at least three years were recruited. Semi-structured interviews were conducted to explore their experience of this practice and how it informed their approach to daily life and, in particular, their health and well-being. Interpretive phenomenological analysis was employed as a method to understand the participantsâ experiences. Three themes were generated using an inductive approach: (1) finding meaningââAll experiences have got so much value nowââ which reflected the participantsâ determination to seek purpose and value in all aspects of their life; (2) Buddhism as a needed âtoolâââI use it all the timeââwhich revealed their practice as an important method to help them manage their lives; and (3) agencyââIâm in control of my destinyââwhich highlighted the participantsâ engagement (supported by their Buddhist practice) in taking responsibility for their actions and responses. Findings indicate the need for future studies to further explore Buddhism as a mechanism for enhancing and sustaining well-being
Duality and KPZ in Liouville Quantum Gravity
We present a (mathematically rigorous) probabilistic and geometrical proof of
the KPZ relation between scaling exponents in a Euclidean planar domain D and
in Liouville quantum gravity. It uses the properly regularized quantum area
measure d\mu_\gamma=\epsilon^{\gamma^2/2} e^{\gamma h_\epsilon(z)}dz, where dz
is Lebesgue measure on D, \gamma is a real parameter, 0\leq \gamma <2, and
h_\epsilon(z) denotes the mean value on the circle of radius \epsilon centered
at z of an instance h of the Gaussian free field on D. The proof extends to the
boundary geometry. The singular case \gamma >2 is shown to be related to the
quantum measure d\mu_{\gamma'}, \gamma' < 2, by the fundamental duality
\gamma\gamma'=4.Comment: 4 pages, 1 figur
Using a Gridded Global Dataset to Characterize Regional Hydroclimate in Central Chile
Central Chile is facing dramatic projections of climate change, with a consensus for declining precipitation, negatively affecting hydropower generation and irrigated agriculture. Rising from sea level to 6000 m within a distance of 200 km, precipitation characterization is difficult because of a lack of long-term observations, especially at higher elevations. For understanding current mean and extreme conditions and recent hydroclimatological change, as well as to provide a baseline for downscaling climate model projections, a temporally and spatially complete dataset of daily meteorology is essential. The authors use a gridded global daily meteorological dataset at 0.25° resolution for the period 1948â2008, adjusted by monthly precipitation observations interpolated to the same grid using a cokriging method with elevation as a covariate. For validation, daily statistics of the adjusted gridded precipitation are compared to station observations. For further validation, a hydrology model is driven with the gridded 0.25° meteorology and streamflow statistics are compared with observed flow. The high elevation precipitation is validated by comparing the simulated snow extent to Moderate Resolution Imaging Spectroradiometer (MODIS) images. Results show that the daily meteorology with the adjusted precipitation can accurately capture the statistical properties of extreme events as well as the sequence of wet and dry events, with hydrological model results displaying reasonable agreement with observed streamflow and snow extent. This demonstrates the successful use of a global gridded data product in a relatively data-sparse region to capture hydroclimatological characteristics and extremes
A re-interpretation of the Triangulum-Andromeda stellar clouds: a population of halo stars kicked out of the Galactic disk
The Triangulum-Andromeda stellar clouds (TriAnd1 and TriAnd2) are a pair of
concentric ring- or shell-like over-densities at large ( 30 kpc)
and ( -10 kpc) in the Galactic halo that are thought to have been
formed from the accretion and disruption of a satellite galaxy. This paper
critically re-examines this formation scenario by comparing the number ratio of
RR Lyrae to M giant stars associated with the TriAnd clouds with other
structures in the Galaxy. The current data suggest a stellar population for
these over-densities ( at 95% confidence) quite unlike
any of the known satellites of the Milky Way ( for
the very largest and for the smaller satellites) and more
like the population of stars born in the much deeper potential well inhabited
by the Galactic disk (). N-body simulations of a
Milky-Way-like galaxy perturbed by the impact of a dwarf galaxy demonstrate
that, in the right circumstances, concentric rings propagating outwards from
that Galactic disk can plausibly produce similar over-densities. These results
provide dramatic support for the recent proposal by Xu et al. (2015) that,
rather than stars accreted from other galaxies, the TriAnd clouds could
represent stars kicked-out from our own disk. If so, these would be the first
populations of disk stars to be found in the Galactic halo and a clear
signature of the importance of this second formation mechanism for stellar
halos more generally. Moreover, their existence at the very extremities of the
disk places strong constraints on the nature of the interaction that formed
them.Comment: 27 pages, 8 figures; published in MNRA
Applications of photography to agricultural research [early photographs of Rothamsted taken from the air]
Pamphlets 256 (11d
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