14,561 research outputs found
Paul Hunt, Trombone, Faculty Artist Recital
No full textSeptember 3, 2019
7:30PM
All Faiths Chapel
Jan Van der Roost - Canzona Gothica
I. Motetus
II. Organum
III. Saltarello
Paul Hunt - A Perambulation of Lite Electronica based on G. F. Handel's Sonata for Recorder, Op. 1, No. 4
I. Slow a la Sibelius with NotePerformer
II. Fast - in the manner of Wendy Carlos
III. Slow - inspired by Isao Tomita
IV. Fast - with my iPad's help
Carl Vollrath - Jaunts for Trombone and Piano
I. Jaunty
II. Haunty
III. Taunty
Joseph Ott - Toccata for Trombone and Piano
Piazzolla - Oblivio
Animal welfare and the harp seal hunt in Atlantic Canada
No full textMuch attention has been given over the years to animal welfare issues surrounding the seal hunt in Atlantic Canada. However, very little information is available on this subject in the scientific literature. This article reports the results of observations made by representatives of the Canadian Veterinary Medical Association at the hunt in recent years and compares them with observations made by members of the International Fund for Animal Welfare. The conclusion is that the large majority of seals taken during this hunt (at best, 98% in work reported here) are killed in an acceptably humane manner. However, the small proportion of animals that are not killed effectively justifies continued attention to this hunt on the part of the veterinary profession.LR: 20070221; PUBM: Print; JID: 0004653; ppublishSource type: Electronic(1
Structure of unsteady stably stratified turbulence with mean shear.
No full textThe statistics of unsteady turbulence with uniform stratification N (Brunt–Väisälä frequency) and shear α(=dU1/dx3) are analysed over the entire time range (00 and \it Ri>0.25 respectively, oscillatory momentum and positive and negative density fluxes develop. Above a critical value of \it Ri\scriptsize\it crit(∼0.3), their average values are persistently countergradient. This structural change in the turbulence is the primary mechanism whereby stable stratification reduces the fluxes and the production of variances. It is quite universal and differs from the energy and stability mechanisms of Richardson (1926) and Taylor (1931). The long-time asymptotics of the energy ratio ER(=\it PE/VKE) of the potential energy to the vertical kinetic energy generally decreases with \it Ri(≥0.25), reaching the smallest value of 3/2 when there is no shear (\it Ri→∞). For strong mean shear (\it Ri<0.25), RDT significantly overestimates ER since (as in unstratified shear flow) it underestimates the vertical kinetic energy VKE. The RDT results show that the asymptotic values of the energy ratio ER and the normalized vertical density flux are independent of the initial value of ER, in agreement with DNS. This independence of the initial condition occurs because the ratios of the contributions from the initial values PE0 and KE0 are the same for PE and VKE and can be explained by the linear processes. Stable stratification generates buoyancy oscillations in the direction of the energy propagation of the internal gravity wave and suppresses the generation of turbulence by mean shear. Because the shear distorts the wavenumber fluctuations, the low-wavenumber spectrum of the vertical kinetic energy has the general form E33(k)∝(αtk)−1, where (LXαt)−1≪k≪L−1X (LX: integral scale). The viscous decay is controlled by the shear, so that the components of larger streamwise wavenumber k1 decay faster. Then, combined with the spectrum distortion by the shear, the energy and the flux are increasingly dominated by the small-k1 components as time elapses. They oscillate at the buoyancy period π/N because even in a shear flow the components as k1→0 are weakly affected by the shear. The effects of stratification N and shear α at small scales are to reduce both VKE and PE. Even for the same \it Ri, larger N and α reduce the high-wavenumber components of VKE and PE. This supports the applicability of the linear assumption for large N and α. At large scales, the stratification and shear effects oppose each other, i.e. both VKE and PE decrease due to the stratification but they increase due to the shear. We conclude that certain of these unsteady results can be applied directly to estimate the properties of sheared turbulence in a statistically steady state, but others can only be applied qualitatively
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The vertical structure of oceanic Rossby waves: a comparison of high-resolution model data to theoretical vertical structures
No full textTests of the new Rossby wave theories that have been developed over the past decade to account for discrepancies between theoretical wave speeds and those observed by satellite altimeters have focused primarily on the surface signature of such waves. It appears, however, that the surface signature of the waves acts only as a rather weak constraint, and that information on the vertical structure of the waves is required to better discriminate between competing theories. Due to the lack of 3-D observations, this paper uses high-resolution model data to construct realistic vertical structures of Rossby waves and compares these to structures predicted by theory. The meridional velocity of a section at 24° S in the Atlantic Ocean is pre-processed using the Radon transform to select the dominant westward signal. Normalized profiles are then constructed using three complementary methods based respectively on: (1) averaging vertical profiles of velocity, (2) diagnosing the amplitude of the Radon transform of the westward propagating signal at different depths, and (3) EOF analysis. These profiles are compared to profiles calculated using four different Rossby wave theories: standard linear theory (SLT), SLT plus mean flow, SLT plus topographic effects, and theory including mean flow and topographic effects. Our results support the classical theoretical assumption that westward propagating signals have a well-defined vertical modal structure associated with a phase speed independent of depth, in contrast with the conclusions of a recent study using the same model but for different locations in the North Atlantic. The model structures are in general surface intensified, with a sign reversal at depth in some regions, notably occurring at shallower depths in the East Atlantic. SLT provides a good fit to the model structures in the top 300 m, but grossly overestimates the sign reversal at depth. The addition of mean flow slightly improves the latter issue, but is too surface intensified. SLT plus topography rectifies the overestimation of the sign reversal, but overestimates the amplitude of the structure for much of the layer above the sign reversal. Combining the effects of mean flow and topography provided the best fit for the mean model profiles, although small errors at the surface and mid-depths are carried over from the individual effects of mean flow and topography respectively. Across the section the best fitting theory varies between SLT plus topography and topography with mean flow, with, in general, SLT plus topography performing better in the east where the sign reversal is less pronounced. None of the theories could accurately reproduce the deeper sign reversals in the west. All theories performed badly at the boundaries. The generalization of this method to other latitudes, oceans, models and baroclinic modes would provide greater insight into the variability in the ocean, while better observational data would allow verification of the model findings
Measurement of the ratio of branching fractions B(B0→K∗0γ )/B(B0s→φγ ) and the directCP asymmetry inB 0→K∗0γ
No full textThe ratio of branching fractions of the radiative B decays B0→K⁎0γ and B0s→ϕγ has been measured using an integrated luminosity of 1.0 fb−1 of pp collision data collected by the LHCb experiment at a centre-of-mass energy of s√=7TeV. The value obtained is
B(B0→K⁎0γ)B(B0s→ϕγ)=1.23±0.06(stat.)±0.04(syst.)±0.10(fs/fd),
where the first uncertainty is statistical, the second is the experimental systematic uncertainty and the third is associated with the ratio of fragmentation fractions fs/fd. Using the world average value for B(B0→K⁎0γ), the branching fraction B(B0s→ϕγ) is measured to be (3.5±0.4)×10−5.
The direct CP asymmetry in B0→K⁎0γ decays has also been measured with the same data and found to be
ACP(B0→K⁎0γ)=(0.8±1.7(stat.)±0.9(syst.))%.
Both measurements are the most precise to date and are in agreement with the previous experimental results and theoretical expectations
China's hunt for oil in Africa in perspective
No full textChina is concerned about the security of its sea-lanes for imports and desires to diversify its oil supplies from the Middle East in order to sustain economic growth. These concerns have sparked China’s interest in trying to ensure oil supplies from as many sources as possible and in reducing its overwhelming reliance on seaborne imports of oil, which, in China’s view, is considered less vulnerable to disruption than oil arriving by tankers. In this context, China has turned the eyes on the emerging oil and gas fields in Africa. Through its high-profile oil diplomacy, China has been successful in developing its access to African oil and gas resources. However, China’s oil diplomacy in Africa has been roundly criticized in Western capitals. Washington increasingly perceives that Beijing’s ties to the so-called rogue states undermine the U.S. goals of isolating or punishing these states that fail to prompt democracy, limit nuclear proliferation or respect human rights. This paper argues that China’s hunt for oil in Africa has been exaggerated by partly-informed commentators, sometimes based on erroneous information, not to mention those that deliberately paint the distorted picture. That said, the paper suggests that, in pursuing its oil diplomacy, Beijing should take into account many factors including Washington concerns, in particular when U.S. concerns also reflect those of a large section of the international community. The paper points out that devoting more resources to build a better future for all and help to eliminate the fear of another Rwanda or Darfur is a positive form that Beijing should take in its engagement with Africa. This way of engagement would be considered more positive by the broad community of states, and helps to enhance China’s security of energy supply and at the same time would significantly reduce one source of tension with Washington. Overall, it will greatly benefit Africa as well as China.China; Oil hunt in Africa; Energy policy
Mechanics of inhomogeneous turbulence and interfacial layers
No full textThe mechanics of inhomogeneous turbulence in and adjacent to interfacial layers bounding turbulent and non-turbulent regions are analysed. Different mechanisms are identified according to the straining by the turbulent eddies in relation to the strength of the mean shear adjacent to, or across, the interfacial layer. How the turbulence is initiated and the topology of the region of turbulence are also significant factors. Specifically the cases of a layer of turbulence bounded on one, or two, sides by a uniform and/or shearing flow, and a circular region of a rotating turbulent vortex are considered and discussed.
The entrainment processes at fluctuating interfaces occur both at the outer edges of turbulent shear layers, with and without free-stream turbulence (e.g. jets, wakes and boundary layers), at internal boundaries such as those at the outside of the non-turbulent core of swirling flows (e.g. the ‘eye-wall’ of a hurricane) or at the top of the viscous sublayer and roughness elements in turbulent boundary layers. Conditionally sampled data enables these concepts to be tested. These concepts lead to physically based estimates for critical modelling parameters such as eddy viscosity near interfaces, entrainment rates, maximum velocity and displacement heights
Data-Driven Control Design for Neuroprotheses: a Virtual Reference Feedback Tuning (VRFT) Approach
No full textA comparison of subjective and objective methods of analysis of the vegetation of Hartland Moor
No full textObservation of the decay [bar over B][0 over s] → ψ(2S)K[superscript +]π[superscript −]
No full textThe decay [bar over B][0 over s] → ψ(2S)K[superscript +]π[superscript −] is observed using a data set corresponding to an integrated luminosity of 3.0 fb[superscript −1] collected by the LHCb experiment in pp collisions at centre-of-mass energies of 7 and 8 TeV. The branching fraction relative to the B[superscript 0] → ψ(2S)K[superscript +]π[superscript −] decay mode is measured to be
[B([bar over B][0 over s] → ψ(2S)K[superscript +]π[superscript −]) over B[superscript 0] → ψ(2S)K[superscript +]π[superscript −] = 5.38 ± 0.36(stat) ± 0.22(syst) ± 0.31(f[subscript s]/f[subscript d])%,
where f[subscript s]/f[subscript d] indicates the uncertainty due to the ratio of probabilities for a b quark to hadronise into B[0 over s] or B[superscript 0] meson. Using an amplitude analysis, the fraction of decays proceeding via an intermediate K[superscript ⁎](892)[superscript 0] meson is measured to be 0.645 ± 0.049(stat) ± 0.049(syst) and its longitudinal polarisation fraction is 0.524 ± 0.056(stat) ± 0.029(syst). The relative branching fraction for this component is determined to be
[B([bar over B][0 over s] → ψ(2S)K[superscript *](892)[superscript 0]) over B(B[superscript 0 → ψ(2S)K[superscript *](892)[superscript 0]]
In addition, the mass splitting between the B[0 over s] and B[superscript 0] mesons is measured as
M(B[0 over s]) − M(B[superscript 0]) = 87.45 ± 0.44(stat) ± 0.09(syst) MeV/c[superscript 2].National Science Foundation (U.S.
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