31,111 research outputs found
Loyalty and longevity in audience listening: investigating experiences of attendance at a chamber music festival
There is currently much concern amongst arts organisations and their marketing departments that audiences for classical music are in decline, yet little research has so far investigated the experiences of long-term listeners for insight on audience development and retention. This paper presents a case study of the Music in the Round chamber music festival, conducted over a three year period which included the retirement of the host string quartet, the appointment of a new resident ensemble, and associated changes in audience attitudes and priorities. The interaction between individual listening and collective membership of an audience is discussed, and the potential considered for understanding classical concert-goers as ‘fans’ or ‘consumers’
Robust Hypothesis Tests for Detecting Statistical Evidence of 2D and 3D Interactions in Single-Molecule Measurements
A variety of experimental techniques have improved the 2D and 3D spatial
resolution that can be extracted from \emph{in vivo} single-molecule
measurements. This enables researchers to quantitatively infer the magnitude
and directionality of forces experienced by biomolecules in their native
cellular environments. Situations where such forces are biologically relevant
range from mitosis to directed transport of protein cargo along cytoskeletal
structures. Models commonly applied to quantify single-molecule dynamics assume
that effective forces and velocity in the (or ) directions are
statistically independent, but this assumption is physically unrealistic in
many situations. We present a hypothesis testing approach capable of
determining if there is evidence of statistical dependence between positional
coordinates in experimentally measured trajectories; if the hypothesis of
independence between spatial coordinates is rejected, then a new model
accounting for 2D (3D) interactions should be considered to more faithfully
represent the underlying experimental kinetics. The technique is robust in the
sense that 2D (3D) interactions can be detected via statistical hypothesis
testing even if there is substantial inconsistency between the physical
particle's actual noise sources and the simplified model's assumed noise
structure. For example, 2D (3D) interactions can be reliably detected even if
the researcher assumes normal diffusion, but the experimental data experiences
"anomalous diffusion" and/or is subjected to a measurement noise characterized
by a distribution differing from that assumed by the fitted model. The approach
is demonstrated on control simulations and on experimental data (IFT88 directed
transport in the primary cilium).Comment: 7 pages, 6 figure
Aeroacoustic effects of reduced aft tip speed at constant thrust for a model counterrotation turboprop at takeoff conditions
A model high-speed, advanced counterrotation propeller, F7/A7, was tested in the anechoic wind tunnel at simulated takeoff and approach conditions of Mach 0.2. The propeller was operated in a baseline configuration with the forward and aft rotor blade setting angles and forward and aft rotational speeds essentially equal. Two additional configurations were tested with the aft rotor at increased blade setting angles and the rotational speed reduced to achieve overall performance similar to that of the baseline configuration. Acoustic data were taken with an axially translating microphone probe that was attached to the tunnel floor. Concurrent aerodynamic data were taken to define propeller operating conditions
A Holographic Prediction of the Deconfinement Temperature
We argue that deconfinement in AdS/QCD models occurs via a first order
Hawking-Page type phase transition between a low temperature thermal AdS space
and a high temperature black hole. Such a result is consistent with the
expected temperature independence, to leading order in 1/N_c, of the meson
spectrum and spatial Wilson loops below the deconfinement temperature. As a
byproduct, we obtain model dependent deconfinement temperatures T_c in the hard
and soft wall models of AdS/QCD. Our result for T_c in the soft wall model is
close to a recent lattice prediction.Comment: 4 pages, 1 figure; v2 ref added, minor changes; v3 refs added,
discussion modified, to appear in PR
Noise of a model counterrotation propeller with simulated fuselage and support pylon at takeoff/approach conditions
Two modern high-speed advanced counterrotation propellers, F7/A7 and F7/A3 were tested in the NASA Lewis Research Centers's 9- by 15-foot Anechoic Wind Tunnel at simulated takeoff/approach conditions of 0.2 Mach number. Both rotors were of similar diameter on the F7/A7 propeller, while the aft rotor diameter of the F7/A3 propeller was 85 percent of the forward propeller to reduce tip vortex-aft rotor interaction. The two propellers were designed for similar performance. The propellers were tested in both the clean configuration, and installed configuration consisting of a simulated upstream nacelle support pylon and fuselage section. Acoustic measurements were made with an axially translating microphone probe, and with a polar microphone probe which was fixed to the propeller nacelle and could make both sideline and circumferential acoustic surveys. Aerodynamic measurements were also made to establish propeller operating conditions. The propellers were run at blade setting angles (fron angle/rear angle) of 41.1/39.4 deg for the F7/A7 propeller, and 41.1/46.4 deg for the F7/A3 propeller. The forward rotors were tested over a range of tip speeds from 165 to 259 m/sec (540 to 850 ft/sec), and both propellers were tested at the maximum rotor-rotor spacing, based on pitch change axis separation, of 14.99 cm (5.90 in.). The data presented in this paper are for 0 deg propeller axis angle of attack. Results are presented for the baseline, pylon-alone, and strut + fuselage configurations. The presence of the simulated fuselage resulted in higher rotor-alone tone levels in a direction normal to the advancing propeller blade near the fuselage. A corresponding rotor-alone tone reduction was often observed 180 deg circumferentially from this region of increased noise. A significant rotor-alone increase for both rotors was observed diametrically opposite the fuselage. In some cases, interaction tone levels were likewise affected by the simulated installation
Educational Progress Across Immigrant Generations in California
Explores the disparities in levels of educational progress among different immigrant population groups in California. Examines factors that influence educational attainment among youth by race, ethnicity, and generation. Includes policy considerations
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