18,197 research outputs found
Proton rich nuclei at and beyond the proton drip line in the Relativistic Mean Field theory
Ground state properties of proton-rich odd- nuclei in the region are studied in the relativistic mean field (RMF) theory. The RMF
equations are solved by using the expansion method in the Harmonic-Oscillator
basis. In the particle-particle channel, we use the state-dependent BCS method
with a zero-range -force, which has been proved to be effective even
for neutron-rich nuclei. All the ground state properties, including the
one-proton separation energies, the ground state deformations, the last
occupied proton orbits and the locations of proton drip line, are calculated.
Good agreement with both the available experimental data and the predictions of
the RHB method are obtained.Comment: the version to appear in Progress of Theoretical Physics, more
discussions adde
Direct Investigation of Superparamagnetism in Co Nanoparticle Films
A direct probe of superparamagnetism was used to determine the complete
anisotropy energy distribution of Co nanoparticle films. The films were
composed of self-assembled lattices of uniform Co nanoparticles 3 nm or 5 nm in
diameter, and a variable temperature scanning-SQUID microscope was used to
measure temperature-induced spontaneous magnetic noise in the samples. Accurate
measurements of anisotropy energy distributions of small volume samples will be
critical to magnetic optimization of nanoparticle devices and media.Comment: 4 pages, 4 figures. Submitted to Physical Review Letter
Electrochemical carbon dioxide concentrator advanced technology tasks
Technology advancement studies are reported on the basic electrochemical CO2 removal process to provide a basis for the design of the next generation cell, module and subsystem hardware. An Advanced Electrochemical Depolarized Concentrator Module (AEDCM) is developed that has the characteristics of low weight, low volume, high CO2, removal, good electrical performance and low process air pressure drop. Component weight and noise reduction for the hardware of a six man capacity CO2 collection subsystem was developed for the air revitalization group of the Space Station Prototype (SSP)
Fahrtbericht der "Poseidon"-Reise 101b [POS101/b] in den Nordostatlantik vom 20.6.83 - 24.7.83
Die Fahrt l0lb des FS "Poseidon" fand zwischen dem 20.6. und 24.7.83 im Nordatlantik statt. Es wurden Schnitte gefahren von Lissabon nach Ponta
Delgada, von Ponta Delgada bis 54°50'N, 37°28'W und zurĂŒck und von Ponta Delgada ĂŒber OWS "R" zum Englischen Kanal (Abbildung 1.1). Es wurde auch eine Vermessung der Polarfront bei 52°N, 33~ durchgefĂŒhrt (Abbildung 1.2).
WÀhrend der ganzen Zeit wurden hydrographische Parameter mit einem geschleppten Fisch-System gemessen. Strömungen an der MeeresoberflÀche
wurden mit einem elektromagnetischen Log und Strömungen in der Tiefe mit einem akustischen Stromprofiler gemessen. Ein Verzeichnis der gefahrenen Schnitte ist in Anhang 1 gegeben
Intrinsic Universality in Self-Assembly
We show that the Tile Assembly Model exhibits a strong notion of universality
where the goal is to give a single tile assembly system that simulates the
behavior of any other tile assembly system. We give a tile assembly system that
is capable of simulating a very wide class of tile systems, including itself.
Specifically, we give a tile set that simulates the assembly of any tile
assembly system in a class of systems that we call \emph{locally consistent}:
each tile binds with exactly the strength needed to stay attached, and that
there are no glue mismatches between tiles in any produced assembly.
Our construction is reminiscent of the studies of \emph{intrinsic
universality} of cellular automata by Ollinger and others, in the sense that
our simulation of a tile system by a tile system represents each tile
in an assembly produced by by a block of tiles in , where
is a constant depending on but not on the size of the assembly
produces (which may in fact be infinite). Also, our construction improves on
earlier simulations of tile assembly systems by other tile assembly systems (in
particular, those of Soloveichik and Winfree, and of Demaine et al.) in that we
simulate the actual process of self-assembly, not just the end result, as in
Soloveichik and Winfree's construction, and we do not discriminate against
infinite structures. Both previous results simulate only temperature 1 systems,
whereas our construction simulates tile assembly systems operating at
temperature 2
Reference gene selection and RNA preservation protocol in the cat flea, Ctenocephalides felis, for gene expression studies
This work was supported by a Knowledge Transfer Network BBSRC Industrial Case (#414 BB/L502467/1) studentship in association Zoetis Inc.Peer reviewedPostprin
Microscopic calculation of the phonon-roton branch in superfluid He
Diffusion Monte Carlo results for the phonon-roton excitation branch in bulk
liquid He at zero temperature are presented. The sign problem associated to
the excited wave function has been dealt both with the fixed-node approximation
and the released-node technique. The upper bounds provided by the fixed-node
approximation are shown to become exact when using the released-node method. An
excellent agreement with experimental data is achieved both at the equilibrium
and near the freezing densities.Comment: 12 pages, RevTex, 3 ps figures include
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