8,492 research outputs found
An Account of the Loss of the Country Ship Forbes and Frazer Sinclair, Her Late Commander
This paper reports on the life of the English Country trader Captain Frazer Sinclair leading up to and following the loss of the Forbes in the Karimata Strait in 1806. It examines the adventure and tenuous times of trading around the Indonesian archipelago after the fall of the VOC and subsequent transfer to the British. Included are the details of Captain Sinclair\u27s trading history, multiple prizes as a privateer, and shipwrecks
Nucleus-nucleus collisions at high baryon densities
We study central collision of Pb + Pb at 20, 40, 80 and 160 A·GeV within the UrQMD transport approach and compare rapidity distributions of ,K+,K and with the recent measurements from the NA49 Collaboration at 40, 80 and 160 A·GeV. It is found that the UrQMD model reasonably describes the data, however, systematically overpredicts the yield by < 20%, whereas the K+ yield is underestimated by < 15%. The K yields are in a good agreement with the experimental data, the yields are also in a reasonable correspondence with the data for all energies. We find that hadronic flavour exchange reactions largely distort the information about the initial strangeness production mechanism at all energies considered. PACS: 25.75.+
Phaseolus vulgaris leuco-agglutinin immunohistochemistry. A comparison between autoradiographic and lectin tracing of neuronal efferents
The autoradiographic pattern of anterograde labeling as a result from injections with tritiated amino acids is compared to the labeling of efferents with Phaseolus vulgaris leuco-agglutinin after lectin injections in the same nucleus visualized by immunohistochemical methods. This comparison is made for efferents from the ventromedial hypothalamic nucleus to the amygdaloid body.
Oxygen and light sensitive field-effect transistors based on ZnO nanoparticles attached to individual double-wall carbon nanotubes
The attachment of semiconducting nanoparticles to carbon nanotubes is one of
the most challenging subjects in nanotechnology. Successful high coverage
attachment and control over the charge transfer mechanism and photo-current
generation opens a wide field of new applications such as highly effective
solar cells and fibre-enhanced polymers. In this work we study the charge
transfer in individual double-wall carbon nanotubes highly covered with uniform
ZnO nanoparticles. The synthetic colloidal procedure was chosen to avoid
long-chained ligands at the nanoparticle-nanotube interface. The resulting
composite material was used as conductive channel in a field effect transistor
device and the electrical photo-response was analysed under various conditions.
By means of the transfer characteristics we could elucidate the mechanism of
charge transfer from non-covalently attached semiconducting nanoparticles to
carbon nanotubes. The role of positive charges remaining on the nanoparticles
is discussed in terms of a gating effect.Comment: 6 pages, 4 figure
Jet Propagation and Mach Cones in (3+1)d Ideal Hydrodynamics
The observation of jet quenching and associated away--side Mach cone--like
correlations at RHIC provide powerful ``external'' probes of the sQGP produced
in A+A reactions, but it simultaneously raises the question where the jet
energy was deposited. The nearly perfect bulk fluidity observed via elliptic
flow suggests that Mach cone--like correlations may also be due to rapid local
equilibration in the wake of penetrating jets. Multi-particle correlations lend
further support to this possibility. However, a combined study of energy
deposition and fluid response is needed. We solve numerically 3--dimensional
ideal hydrodynamical equations to compute the flow correlation patterns
resulting from a variety of possible energy-momentum deposition models.
Mach--cone correlations are shown to depend critically on the energy and
momentum deposition mechanisms. They only survive for a special limited class
of energy--momentum loss models, which assume significantly less longitudinal
momentum loss than energy loss per unit length. We conclude that the correct
interpretation of away--side jet correlations will require improved
understanding and independent experimental constraints on the jet
energy--momentum loss to fluid couplings.Comment: 4 pages, 3 figures, To appear in the proceedings of Quark Matter 200
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