7,979 research outputs found
Anisotropic Assembly of Colloidal Nanoparticles: Exploiting Substrate Crystallinity
We show that the crystal structure of a substrate can be exploited to drive the anisotropic assembly of colloidal nanoparticles. Pentanethiol-passivated Au particles of approximately 2 nm diameter deposited from toluene onto hydrogen-passivated Si(111) surfaces form linear assemblies (rods) with a narrow width distribution. The rod orientations mirror the substrate symmetry, with a high degree of alignment along principal crystallographic axes of the Si(111) surface. There is a strong preference for
anisotropic growth with rod widths substantially more tightly distributed than lengths. Entropic trapping of nanoparticles provides a plausible explanation for the formation of the anisotropic assemblies we observe
Instructional Alignment of Workplace Readiness Skills in Marketing Education
This study examined high school marketing education teachers’ knowledge of workplace readiness skills and whether that knowledge had an impact on student workplace readiness skill achievement. Further, this study examined the usage of Virginia’s 13 Workplace Readiness Skills curriculum and identified the teaching methods and instructional strategies used to disseminate the skills to students. Three sets of data were used for this study: teacher workplace readiness skills data, teacher survey data, and student workplace readiness skills post-test data. Pearson’s correlation was used to determine whether teacher knowledge of workplace readiness skills had an impact on student attainment of the same. The results showed that while overall teacher scores did not show a statistical significance on overall student scores, there were four individual skill areas in which there was a relationship between teacher and student scores
The Effect of Preservation on Urogenital Papilla Length in the Least Brook Lampre, \u3cem\u3eLampetra aepyptera\u3c/em\u3e
Disc precession in Be/X-ray binaries drives superorbital variations of outbursts and colour
Superorbital periods that are observed in the brightness of Be/X-ray binaries
may be driven by a misaligned and precessing Be star disc. We examine how the
precessing disc model explains the superorbital variation of (i) the magnitude
of the observed X-ray outbursts and (ii) the observed colour. With
hydrodynamical simulations we show that the magnitude of the average accretion
rate on to the neutron star, and therefore the X-ray outbursts, can vary by
over an order of magnitude over the superorbital period for Be star spin-orbit
misalignments as a result of weak tidal truncation. Most
Be/X-ray binaries are redder at optical maximum when the disc is viewed closest
to face-on since the disc adds a large red component to the emission. However,
A0538-66 is redder at optical minimum. This opposite behaviour requires an
edge-on disc at optical minimum and a radially narrow disc such that it does
not add a large red signature when viewed face-on. For A0538-66, the
misalignment of the disc to the binary orbit must be about and
the inclination of the binary orbit to the line of sight must be similarly
high, although restricted to by the absence of X-ray eclipses.Comment: Accepted for publication in MNRA
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