835 research outputs found
LM cathode thruster system Quarterly progress report, 4 Jan. 1969 - 4 Apr. 1970
Development of 20 cm liquid metal cathode thruster syste
A theoretical and semiemprical correction to the long-range dispersion power law of stretched graphite
In recent years intercalated and pillared graphitic systems have come under
increasing scrutiny because of their potential for modern energy technologies.
While traditional \emph{ab initio} methods such as the LDA give accurate
geometries for graphite they are poorer at predicting physicial properties such
as cohesive energies and elastic constants perpendicular to the layers because
of the strong dependence on long-range dispersion forces. `Stretching' the
layers via pillars or intercalation further highlights these weaknesses. We use
the ideas developed by [J. F. Dobson et al, Phys. Rev. Lett. {\bf 96}, 073201
(2006)] as a starting point to show that the asymptotic dependence
of the cohesive energy on layer spacing in bigraphene is universal to all
graphitic systems with evenly spaced layers. At spacings appropriate to
intercalates, this differs from and begins to dominate the power
law for dispersion that has been widely used previously. The corrected power
law (and a calculated coefficient) is then unsuccesfully employed in the
semiempirical approach of [M. Hasegawa and K. Nishidate, Phys. Rev. B {\bf 70},
205431 (2004)] (HN). A modified, physicially motivated semiempirical method
including some effects allows the HN method to be used
successfully and gives an absolute increase of about to the predicted
cohesive energy, while still maintaining the correct asymptotics
Queen discrimination by honeybee (Apis mellifera L) workers
A simple new technique for testing worker honeybees' ability to distinguish between honeybee queens is presented. Two queens were caged separately with groups of young sibling workers which were the daughters of another queen. The cages were exposed to the same environmental odours for 10 days. When placed in the test apparatus and given a choice of both queens, workers segregated towards the queen with which they had been caged. This provides further evidence that the distinctive odour of an individual queen is probably partly inherited and is learned by workers. The nature and functioning of queen odours are discussed
Magnetic flux flow and superconductor stabilization Quarterly report, 1 Jan. - 31 Mar. 1968
Magnetic flux flow and stability of superconducting niobium titanium strip
Reliable and accurate diagnostics from highly multiplexed sequencing assays
Scalable, inexpensive, and secure testing for SARS-CoV-2 infection is crucial for control of the novel coronavirus pandemic. Recently developed highly multiplexed sequencing assays (HMSAs) that rely on high-throughput sequencing can, in principle, meet these demands, and present promising alternatives to currently used RT-qPCR-based tests. However, reliable analysis, interpretation, and clinical use of HMSAs requires overcoming several computational, statistical and engineering challenges. Using recently acquired experimental data, we present and validate a computational workflow based on kallisto and bustools, that utilizes robust statistical methods and fast, memory efficient algorithms, to quickly, accurately and reliably process high-throughput sequencing data. We show that our workflow is effective at processing data from all recently proposed SARS-CoV-2 sequencing based diagnostic tests, and is generally applicable to any diagnostic HMSA
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Encouraging girls in math and science
The objective of this guide is to provide teachers with specific recommendations that can be carried out in the classroom without requiring systemic change. Other school personnel having direct contact with students, such as coaches, counselors, and principals, will also find the guide useful
Tropical Connections to Climatic Change in the Extratropical Southern Hemisphere: The Role of Atlantic SST Trends
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Moored temperature and conductivity observations during AIWEX
This report presents observations from moorings of temperature, conductivity
and pressure, made during the Arctic Internal Wave Experiment (AIWEX)
in March-April 1985.
The purpose of the temperature and conductivity measurements was to
provide time series from which inferences could be made about the vertical
displacement of the internal waves
Two-dimensional Navier--Stokes simulation of deformation and break up of liquid patches
The large deformations and break up of circular 2D liquid patches in a high
Reynolds number (Re=1000) gas flow are investigated numerically. The 2D, plane
flow Navier--Stokes equations are directly solved with explicit tracking of the
interface between the two phases and a new algorithm for surface tension. The
numerical method is able to pursue the simulation beyond the breaking or
coalescence of droplets. The simulations are able to unveil the intriguing
details of the non-linear interplay between the deforming droplets and the
vortical structures in the droplet's wake.Comment: 13 pages including 4 postscript figures; Revised version as
resubmitted to PRL. Title has change
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