539 research outputs found
Earth Observations Division version of the Laboratory for Applications of Remote Sensing System (EOD-LARSYS) user guide for the IBM 370/148. Volume 3: As-built documentation (sections 13-23)
There are no author-identified significant results in this report
Earth Observations Division version of the Laboratory for Applications of Remote Sensing system (EOD-LARSYS) user guide for the IBM 370/148. Volume 4: Program listings
There are no author-identified significant results in this report
Effect of Patterned Slip on Micro and Nanofluidic Flows
We consider the flow of a Newtonian fluid in a nano or microchannel with
walls that have patterned variations in slip length. We formulate a set of
equations to describe the effects on an incompressible Newtonian flow of small
variations in slip, and solve these equations for slow flows. We test these
equations using molecular dynamics simulations of flow between two walls which
have patterned variations in wettability. Good qualitative agreement and a
reasonable degree of quantitative agreement is found between the theory and the
molecular dynamics simulations. The results of both analyses show that
patterned wettability can be used to induce complex variations in flow. Finally
we discuss the implications of our results for the design of microfluidic
mixers using slip.Comment: 13 pages, 12 figures, final version for publicatio
Normal state properties of high angle grain boundaries in (Y,Ca)Ba2Cu3O7-delta
By lithographically fabricating an optimised Wheatstone bridge geometry, we
have been able to make accurate measurements of the resistance of grain
boundaries in Y1-xCaxBa2Cu3O7-d between the superconducting transition
temperature, Tc, and room temperature. Below Tc the normal state properties
were assessed by applying sufficiently high currents. The behaviour of the
grain boundary resistance versus temperature and of the conductance versus
voltage are discussed in the framework charge transport through a tunnel
barrier. The influence of misorientation angle, oxygen content, and calcium
doping on the normal state properties is related to changes of the height and
shape of the grain boundary potential barrier.Comment: 17 pages, 1 table, 5 figures, submitted to PR
The incidence of Gorlin syndrome in 173 consecutive cases of medulloblastoma.
We have investigated the incidence of Gorlin syndrome (GS) in patients with the childhood brain tumour, medulloblastoma. One hundred and seventy-three consecutive cases of medulloblastoma in the North-West Regional Health Authority between 1954 and 1989 (Manchester Regional Health Board before 1974) were studied. After review of case notes, X-rays and health surveys only 2/173 cases had evidence supporting a diagnosis of GS. A further case at 50% risk of GS died of a brain tumour aged 4 years. The incidence of GS in medulloblastoma is, therefore, probably between 1-2%. A population based study of GS in the region started in 1983 was used to assess the incidence of medulloblastoma in GS, which was found to be between 3-5%. This figure is lower than previous estimates, but this is the first population based study undertaken. In view of the early age of onset in GS (mean 2 years) children presenting with medulloblastoma, especially under 5 years, should be examined for signs of the syndrome. Those at high risk of developing multiple invasive basal cell carcinomata will then be identified
All change: job rotations as a workplace learning tool in the Flinders University Library Graduate Trainee Program
This paper examines the place of job rotations as a workplace learning tool in the Graduate
Trainee Librarian Program at Flinders University Library, Australia. Specifically, it asks two
questions: whether job rotation is an effective workplace learning tool for new librarians;
and, whether the trainee experience contributed to the retention in the Library and career
progression of those in the program. These questions are examined using Kirkpatrick's
Evaluation Framework. The findings indicate that while participants rate the trainee
program very positively overall, their satisfaction with workplace learning in their
placements was lower. The majority of former trainees have remained with the Library and
have progressed in their careers
Spin-valve Josephson junctions with perpendicular magnetic anisotropy for cryogenic memory
We demonstrate a Josephson junction with a weak link containing two ferromagnets with perpendicular magnetic anisotropy and independent switching fields in which the critical current can be set by the mutual orientation of the two layers. Such pseudospin-valve Josephson junctions are a candidate cryogenic memory in an all superconducting computational scheme. Here, we use Pt/Co/Pt/CoB/Pt as the weak link of the junction with dCo=0.6 nm, dCoB=0.3 nm, and dPt=5 nm and obtain a 60% change in the critical current for the two magnetization configurations of the pseudospin-valve. Ferromagnets with perpendicular magnetic anisotropy have advantages over magnetization in-plane systems, which have been exclusively considered at this point, as, in principle, the magnetization and magnetic switching of layers in the junction should not affect the in-plane magnetic flux
Devil's staircases and supersolids in a one-dimensional dipolar Bose gas
We consider a single-component gas of dipolar bosons confined in a
one-dimensional optical lattice, where the dipoles are aligned such that the
long-ranged dipolar interactions are maximally repulsive. In the limit of zero
inter-site hopping and sufficiently large on-site interaction, the phase
diagram is a complete devil's staircase for filling fractions between 0 and 1,
wherein every commensurate state at a rational filling is stable over a finite
interval in chemical potential. We perturb away from this limit in two
experimentally motivated directions involving the addition of hopping and a
reduction of the onsite interaction. The addition of hopping alone yields a
phase diagram, which we compute in perturbation theory in the hopping, where
the commensurate Mott phases now compete with the superfluid. Further softening
of the onsite interaction yields alternative commensurate states with double
occupancies which can form a staircase of their own, as well as one-dimensional
"supersolids" which simultaneously exhibit discrete broken symmetries and
superfluidity
Phase diagram of bismuth in the extreme quantum limit
Elemental bismuth provides a rare opportunity to explore the fate of a
three-dimensional gas of highly mobile electrons confined to their lowest
Landau level. Coulomb interaction, neglected in the band picture, is expected
to become significant in this extreme quantum limit with poorly understood
consequences. Here, we present a study of the angular-dependent Nernst effect
in bismuth, which establishes the existence of ultraquantum field scales on top
of its complex single-particle spectrum. Each time a Landau level crosses the
Fermi level, the Nernst response sharply peaks. All such peaks are resolved by
the experiment and their complex angular-dependence is in very good agreement
with the theory. Beyond the quantum limit, we resolve additional Nernst peaks
signaling a cascade of additional Landau sub-levels caused by electron
interaction
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