18,017 research outputs found
Internally coated air-cooled gas turbine blading
Ten candidate modified nickel-aluminide coatings were developed using the slip pack process. These coatings contain additives such as silicon, chromium and columbium in a nickel-aluminum coating matrix with directionally solidified MAR-M200 + Hf as the substrate alloy. Following a series of screening tests which included strain tolerance, dynamic oxidation and hot corrosion testing, the Ni-19A1-1Cb (nominal composition) coating was selected for application to the internal passages of four first-stage turbine blades. Process development results indicate that a dry pack process is suitable for internal coating application resulting in 18 percent or less reduction in air flow. Coating uniformity, based on coated air-cooled blades, was within + or - 20 percent. Test results show that the presence of additives (silicon, chromium or columbium) appeared to improve significantly the ductility of the NiA1 matrix. However, the environmental resistance of these modified nickel-aluminides were generally inferior to the simple aluminides
Accretion Disk Temperatures of QSOs: Constraints from the Emission Lines
QSO emission-line spectra are compared to predictions based on theoretical
ionizing continua of accretion disks. Observed line intensities do not show the
expected trend of higher ionization with higher accretion disk temperature as
derived from the black hole mass and accretion rate. This suggests that, at
least for accretion rates close to the Eddington limit, the inner disk does not
reach temperatures as high as expected from standard disk theory. Modified
radial temperature profiles, taking account of winds or advection in the inner
disk, achieve better agreement with observation. This conclusion agrees with an
earlier study of QSO continuum colors as a function of disk temperature. The
emission lines of radio-detected and radio-undetected sources show different
trends as a function of disk temperature.Comment: 9 pages, 8 figures, submitted to Ap
The treatment of zero eigenvalues of the matrix governing the equations of motion in many-body Green's function theory
The spectral theorem of many-body Green's function theory relates
thermodynamic correlations to Green's functions. More often than not, the
matrix governing the equations of motion has zero eigenvalues. In this case,
the standard text-book approach requires both commutator and anti-commutator
Green's functions to obtain equations for that part of the correlation which
does not lie in the null space of the matrix. In this paper, we show that this
procedure fails if the projector onto the null space is dependent on the
momentum vector. We propose an alternative formulation of the theory in terms
of the non-null space alone and we show that a solution is possible if one can
find a momentum-independent projector onto some subspace of the non-null space.
To do this, we enlist the aid of the singular value decomposition (SVD) of the
equation of motion matrix in order to project out the null space, thus reducing
the size of the matrix and eliminating the need for the anti-commutator Green's
function. We extend our previous work, dealing with a ferromagnetic Heisenberg
monolayer and a momentum-independent projector onto the null space, where both
multilayer films and a momentum-dependent projector are considered. We develop
the numerical methods capable of handling these cases and offer a computational
algorithmus that should be applicable to any similar problem arising in Green's
function theory.Comment: 16 pages, 7 figure
Ray-optical negative refraction and pseudoscopic imaging with Dove-prism arrays
A sheet consisting of an array of small, aligned Dove prisms can locally (on the scale of the width of the prisms) invert one component of the ray direction. A sandwich of two such Dove-prism sheets that inverts both transverse components of the ray direction is a ray-optical approximation to the interface between two media with refractive indices +n and –n. We demonstrate the simulated imaging properties of such a Dove-prism-sheet sandwich, including a demonstration of pseudoscopic imaging
Methods for Volumetric Reconstruction of Visual Scenes
In this paper, we present methods for 3D volumetric reconstruction of visual scenes photographed by multiple calibrated cameras placed at arbitrary viewpoints. Our goal is to generate a 3D model that can be rendered to synthesize new photo-realistic views of the scene. We improve upon existing voxel coloring/space carving approaches by introducing new ways to compute visibility and photo-consistency, as well as model infinitely large scenes. In particular, we describe a visibility approach that uses all possible color information from the photographs during reconstruction, photo-consistency measures that are more robust and/or require less manual intervention, and a volumetric warping method for application of these reconstruction methods to large-scale scenes
On the relationship among cloud turbulence, droplet formation and drizzle as viewed by Doppler radar, microwave radiometer and lidar
Do Beliefs about Knowledge Predict Occupational Therapy Students’ Critical Thinking? A Longitudinal Correlational Study
Beliefs about knowledge and knowing, or epistemic and ontological cognition (EOC), are potential influences on critical thinking, yet little research exploring these relationships has been published in educational literature or in occupational therapy (OT). This study examined the association between domain-general and OT-specific EOC and critical thinking in OT students. The Epistemological Beliefs Inventory, modified Four-Quadrant Scale, and Watson-Glaser Critical Thinking Appraisal were administered to a convenience sample of 102 OT students, before and after the didactic portion of an OT program. Results of logistic regression indicated that only the general belief in an omniscient authority as a source of knowledge was a statistically significant predictor of critical thinking, both before and after the didactic portion of the program. These findings partially support the hypothesis that EOC and critical thinking are related. Domain-general EOC and OT-specific ontological cognition also became more sophisticated over time, but OT-specific epistemic cognition and critical thinking did not change significantly
Development of a scheme for parameterizing the effects of cloud condensation nuclei on stratocumulus cloud albedo
Recommended from our members
Spherical nonparametric estimators applied to the UGAMP model integration for AMIP
The aim of this paper is essentially twofold: first, to describe the
use of spherical nonparametric estimators for determining statistical
diagnostic fields from ensembles of feature tracks on a global domain,
and second, to report the application of these techniques to data
derived from a modern general circulation model. New spherical kernel
functions are introduced that are more efficiently computed than
the traditional exponential kernels. The data-driven techniques of
cross-validation to determine the amount elf smoothing objectively,
and adaptive smoothing to vary the smoothing locally, are also considered.
Also introduced are techniques for combining seasonal statistical
distributions to produce longer-term statistical distributions. Although
all calculations are performed globally, only the results for the
Northern Hemisphere winter (December, January, February) and Southern
Hemisphere winter (June, July, August) cyclonic activity are presented,
discussed, and compared with previous studies. Overall, results for
the two hemispheric winters are in good agreement with previous studies,
both for model-based studies and observational studies
- …