9,822 research outputs found
Development and flight test of an experimental maneuver autopilot for a highly maneuverable aircraft
This report presents the development of an experimental flight test maneuver autopilot (FTMAP) for a highly maneuverable aircraft. The essence of this technique is the application of an autopilot to provide precise control during required flight test maneuvers. This newly developed flight test technique is being applied at the Dryden Flight Research Facility of NASA Ames Research Center. The FTMAP is designed to increase the quantity and quality of data obtained in test flight. The technique was developed and demonstrated on the highly maneuverable aircraft technology (HiMAT) vehicle. This report describes the HiMAT vehicle systems, maneuver requirements, FTMAP development process, and flight results
Infrared confocal imaging for inspection of flaws in yttria-stabilized tetragonal zirconia polycrystal (Y-TZP)
XPS and AFM study of interaction of organosilane and sizing with e-glass fibre surface
Organosilanes are often used in commercial sizings for glass fibres to provide wettability with the resin and promote strong interfacial adhesion to the matrix in a fibre reinforced polymer composite. The silane treatment is introduced as part of a complex deposition from an aqueous emulsion immediately at the spinaret and determines the optimum properties of the cured composite. To understand the interaction of organosilanes contained in sizings for glass surfaces, XPS was used to investigate the adsorption of γ-aminopropyltriethoxysilane (APS) from a simple sizing system containing a polyurethane (PU) film former. It has been found that both APS and the sizing (containing APS and PU) deposits on E-glass fibre surfaces contained components of differing hydrolytic stability. The differences observed in the AFM images of APS coated E-glass fibres before and after water extraction also confirmed that the APS deposit contained components with different water solubility
File audit to assess sustained fidelity to a recovery and wellbeing oriented mental health service model: An Australian case study
2019 The Author(s). Background: Over the past decade there has been increasing attention to implementing recovery-oriented approaches within mental health service practice and enhancing fidelity to such approaches. However, as is often the case with evidence-based practices, less attention has been paid to the sustainability of recovery-oriented approaches over time. This study sought to investigate whether fidelity to a recovery-oriented practice framework - the Collaborative Recovery Model could be sustained over time. Method: The study setting was an Australian community managed mental health organisation. A file audit of consumer support plans was undertaken using the Goal and Action Plan Instrument for Quality audit tool (GAP-IQ). The audit tool assessed 17 areas for quality. Consumers (n = 116) from a large community managed mental health organisation participated in the study. Sustained fidelity to the Collaborative Recovery Model (CRM) was determined by comparing results from the file audit to a similar audit conducted 3 years earlier. Results: The file audit revealed a significant increase in fidelity to CRM practices between 2011 and 2014. Fidelity to individual audit items that comprise the GAP-IQ was also found to significantly increase across 16 of the 17 GAP-IQ audit items, with the exception of the \u27Action Plan Review\u27 audit item. Conclusions: A comparison of file audit data across different time points within the same setting can provide useful feedback about whether or not a practice is being sustained over time. Although fidelity increased overtime the study design does not allow conclusions that training and coaching practices implemented by the organisation were responsible
The Southern 2MASS AGN Survey: spectroscopic follow-up with 6dF
The Two Micron All-Sky Survey (2MASS) has provided a uniform photometric
catalog to search for previously unknown red AGN and QSOs. We have extended the
search to the southern equatorial sky by obtaining spectra for 1182 AGN
candidates using the 6dF multifibre spectrograph on the UK Schmidt Telescope.
These were scheduled as auxiliary targets for the 6dF Galaxy Redshift Survey.
The candidates were selected using a single color cut of J - Ks > 2 to Ks ~
15.5 and a galactic latitude of |b|>30 deg. 432 spectra were of sufficient
quality to enable a reliable classification. 116 sources (or ~27%) were
securely classified as type 1 AGN, 20 as probable type 1s, and 57 as probable
type 2 AGN. Most of them span the redshift range 0.05<z<0.5 and only 8 (or ~6%)
were previously identified as AGN or QSOs. Our selection leads to a
significantly higher AGN identification rate amongst local galaxies (>20%) than
in any previous galaxy survey. A small fraction of the type 1 AGN could have
their optical colors reddened by optically thin dust with A_V<2 mag relative to
optically selected QSOs. A handful show evidence for excess far-IR emission.
The equivalent width (EW) and color distributions of the type 1 and 2 AGN are
consistent with AGN unified models. In particular, the EW of the [OIII]
emission line weakly correlates with optical--near-IR color in each class of
AGN, suggesting anisotropic obscuration of the AGN continuum. Overall, the
optical properties of the 2MASS red AGN are not dramatically different from
those of optically-selected QSOs. Our near-IR selection appears to detect the
most near-IR luminous QSOs in the local universe to z~0.6 and provides
incentive to extend the search to deeper near-IR surveys.Comment: 57 pages, 12 figures, 4 tables, to appear in vol.27/4 of Publications
of the Astronomical Society of Australia (PASA
Exploiting neutron-rich radioactive ion beams to constrain the symmetry energy
The Modular Neutron Array (MoNA) and 4 Tm Sweeper magnet were used to measure
the free neutrons and heavy charged particles from the radioactive ion beam
induced 32Mg + 9Be reaction. The fragmentation reaction was simulated with the
Constrained Molecular Dynamics model(CoMD), which demonstrated that the
of the heavy fragments and free neutron multiplicities were observables
sensitive to the density dependence of the symmetry energy at sub-saturation
densities. Through comparison of these simulations with the experimental data
constraints on the density dependence of the symmetry energy were extracted.
The advantage of radioactive ion beams as a probe of the symmetry energy is
demonstrated through examination of CoMD calculations for stable and
radioactive beam induced reactions
Charged-Particle Motion in Electromagnetic Fields Having at Least One Ignorable Spatial Coordinate
We give a rigorous derivation of a theorem showing that charged particles in
an arbitrary electromagnetic field with at least one ignorable spatial
coordinate remain forever tied to a given magnetic-field line. Such a situation
contrasts the significant motions normal to the magnetic field that are
expected in most real three-dimensional systems. It is pointed out that, while
the significance of the theorem has not been widely appreciated, it has
important consequences for a number of problems and is of particular relevance
for the acceleration of cosmic rays by shocks.Comment: 7 pages, emulateapj format, including 1 eps figure, to appear in The
Astrophysical Journal, Dec. 10 1998 issu
Magnetohydrodynamic Jump Conditions for Oblique Relativistic Shocks with Gyrotropic Pressure
Shock jump conditions are obtained for steady-state, plane shocks with
oblique magnetic fields and arbitrary flow speeds. For ultrarelativistic and
nonrelativistic shocks, the jump conditions may be solved analytically. For
mildly relativistic shocks, analytic solutions are obtained for isotropic
pressure using an approximation for the adiabatic index that is valid in high
sonic Mach number cases. In the more general case of gyrotropic pressure, the
jump conditions cannot be solved analytically without additional assumptions,
and the effects of gyrotropic pressure are investigated by parameterizing the
distribution of pressure parallel and perpendicular to the magnetic field. Our
numerical solutions reveal that relatively small departures from isotropy
(e.g., about 20%) produce significant changes in the shock compression ratio,
r, at all shock Lorentz factors, including ultrarelativistic ones, where an
analytic solution with gyrotropic pressure is obtained. In particular, either
dynamically important fields or significant pressure anisotropies can incur
marked departures from the canonical gas dynamic value of r=3 for a shocked
ultrarelativistic flow and this may impact models of particle acceleration in
gamma-ray bursts and other environments where relativistic shocks are inferred.
The jump conditions presented apply directly to test-particle acceleration, and
will facilitate future self-consistent numerical modeling of particle
acceleration at oblique, relativistic shocks.Comment: 26 pages with 7 figures, submitted to Ap. J. April 200
Quantification of mesoscale variability and geometrical reconstruction of a textile
Automated image analysis of textile surfaces allowed determination and quantification of intrinsic yarn path variabilities in a 2/2 twill weave during the lay-up process. The yarn paths were described in terms of waves and it was found that the frequencies are similar in warp and weft directions and hardly affected by introduced yarn path deformations. The most significant source of fabric variability was introduced during handling before cutting. These resulting systematic deformations will need to be considered when designing or analysing a composite component. An automated method for three dimensional reconstruction of the analysed lay-up was implemented in TexGen which will allow virtual testing of components in the future
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