96,696 research outputs found
Compact, electromagnetic multiple-stream multiple-stream pump for liquid metals - Design concept
Pump provides independent liquid-metal streams at a uniform flow rate. The toroidal magnet structure can accomodate any reasonable number of pump circuits. The power requirement is suited to the output voltage of the basic thermionic diode output
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Productivity and equity returns: A century of evidence for 9 OECD countries
The share market boom in the 1990s is often linked to the acceleration in labour
productivity over the same period. This paper explores the suggestions that labour productivity
may be an inaccurate measure of firmâs cash flow which underlies equity valuations, and that
innovations in productivity in the 1990s may have had only have temporary effects on capital
productivity, the key element of the more correct measure of cash flow. Using a century of data for
the OECD countries it is shown empirically that the link of productivity to share returns is indeed
strongest for capital productivity, but generally the link is weaker that is sometimes maintained in
the literature
Superfluid Phase Stability of He in Axially Anisotropic Aerogel
Measurements of superfluid He in 98% aerogel demonstrate the existence of
a metastable \emph{A}-like phase and a stable \emph{B}-like phase. It has been
suggested that the relative stability of these two phases is controlled by
anisotropic quasiparticle scattering in the aerogel. Anisotropic scattering
produced by axial compression of the aerogel has been predicted to stabilize
the axial state of superfluid He. To explore this possiblity, we used
transverse acoustic impedance to map out the phase diagram of superfluid He
in a % porous silica aerogel subjected to 17% axial compression. We
have previously shown that axial anisotropy in aerogel leads to optical
birefringence and that optical cross-polarization studies can be used to
characterize such anisotropy. Consequently, we have performed optical
cross-polarization experiments to verify the presence and uniformity of the
axial anisotropy in our aerogel sample. We find that uniform axial anisotropy
introduced by 17% compression does not stabilize the \emph{A}-like phase. We
also find an increase in the supercooling of the \emph{A}-like phase at lower
pressure, indicating a modification to \emph{B}-like phase nucleation in
\emph{globally} anisotropic aerogels.Comment: 4 pages, 4 figures, submitted to LT25 (25th International Conference
on Low Temperature Physics
The Projected Gross-Pitaevskii Equation for harmonically confined Bose gases
We extend the Projected Gross Pitaevskii equation formalism of Davis et al.
[Phys. Rev. Lett. \bf{87}, 160402 (2001)] to the experimentally relevant case
of harmonic potentials. We outline a robust and accurate numerical scheme that
can efficiently simulate this system. We apply this method to investigate the
equilibrium properties of a harmonically trapped three-dimensional Bose gas at
finite temperature, and consider the dependence of condensate fraction,
position and momentum distributions, and density fluctuations on temperature.
We apply the scheme to simulate an evaporative cooling process in which the
preferential removal of high energy particles leads to the growth of a
Bose-Einstein condensate. We show that a condensate fraction can be inferred
during the dynamics even in this non-equilibrium situation.Comment: 11 pages, 7 figure
Critical temperature of a trapped Bose gas: comparison of theory and experiment
We apply the Projected Gross-Pitaevskii equation (PGPE) formalism to the
experimental problem of the shift in critical temperature of a
harmonically confined Bose gas as reported in Gerbier \emph{et al.} [Phys. Rev.
Lett. \textbf{92}, 030405 (2004)]. The PGPE method includes critical
fluctuations and we find the results differ from various mean-field theories,
and are in best agreement with experimental data. To unequivocally observe
beyond mean-field effects, however, the experimental precision must either
improve by an order of magnitude, or consider more strongly interacting
systems. This is the first application of a classical field method to make
quantitative comparison with experiment.Comment: revtex4, four pages, three figures. v2: updated to published version.
Several additions to figures, and better explanations in text in response to
referee comment
Editorial, Seminars in Cell & Developmental Biology
It is a pleasure to introduce this special edition of Cell and Development
Biology dedicated to the field and application of Biosensors. This edition
comprises seven reviews covering the most active research areas where we believe
some of the most prominent advances in the field are likely to emerge in the
near to medium term. In line with scope of this journal, some emphasis is given
towards techniques applicable to Cell Biology
Acoustic Spectroscopy of Superfluid 3He in Aerogel
We have designed an experiment to study the role of global anisotropic
quasiparticle scattering on the dirty aerogel superfluid 3He system. We observe
significant regions of two stable phases at temperatures below the superfluid
transition at a pressure of 25 bar for a 98% aerogel.Comment: 2 pages, 2 figures, accepted for publication in proceedings of Low
Temperature Conference 2
Carrier systems and biosensors for biomedical applications.
This chapter addresses both carrier systems and biosensors which are often
applied directly to tissues, either as skin patches, implanted or ingested by a
variety of routes. It follows that there is a common theme between these
applications and many of those discussed elsewhere within this book. Any device,
scaffold or implant within the body must usually display extreme
biocompatibility if it is not to cause harm to the patient. The techniques of
tailoring surfaces to ensure no adverse reactions are a common theme running
throughout this work on tissue engineering
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