18,475 research outputs found
Transient heat and mass transfer analysis of supercritical cryogenic storage systems with spherical static heaters Final report
Transient heat and mass transfer analysis of supercritical cryogenic storage systems with spherical static heaters by computer progra
Coolant pressure and flow distribution through an air-cooled vane for a high temperature gas turbine
Coolant pressure and flow distribution through air cooled vane for high temperature gas turbin
Soil survey of Vasse Research Station, Western Australia
This soil survey of the Vasse Research Station properties was carried out at the request of the Division of Plant Production of the Agriculture Western Australia. The survey followed a preliminary examination and mapping of soil series in the area by Mr T. Stoneman in 1982, after which it was concluded that more detailed survey work was required to assist farm management and research experimentation.
The research station consists of two blocks, referred to here as the main block (Sussex Locations 1475, 1439, 2128, 2138, 2137, 2136, 2129, 2130, 2119, 2118, 2126 and 2125) and the hill block (Sussex Locations 3024, 3025 and part of 1864) approximately 12 km due south, and 15 km south-south-east respectively from Busselton. (Figure 1). The main (lowland) portion of the research station is approximately 610 ha in area and the hill block further south covers approximately 160 ha. The country is considered to be representative of much of the inland Swan Coastal Plain and its margin with the Whicher Range between Boyanup and Dunsborough.
The work was conducted using a free survey technique where map unit boundaries and field observation sites were selected on the basis of air photo interpretation. Aerial photos enlarged to scales of 1:10,000 and 1:2000 respectively were used for the main and hill blocks. The final map presented in this report is at a uniform scale of 1:10,000. For those interested in the greater detail provided on the preliminary 1:2000 scale for the hill block map copies may be sought from the Division of Resource Management
The effect of parallel static and microwave electric fields on excited hydrogen atoms
Motivated by recent experiments we analyse the classical dynamics of a
hydrogen atom in parallel static and microwave electric fields. Using an
appropriate representation and averaging approximations we show that resonant
ionisation is controlled by a separatrix, and provide necessary conditions for
a dynamical resonance to affect the ionisation probability.
The position of the dynamical resonance is computed using a high-order
perturbation series, and estimate its radius of convergence. We show that the
position of the dynamical resonance does not coincide precisely with the
ionisation maxima, and that the field switch-on time can dramatically affect
the ionisation signal which, for long switch times, reflects the shape of an
incipient homoclinic. Similarly, the resonance ionisation time can reflect the
time-scale of the separatrix motion, which is therefore longer than
conventional static field Stark ionisation. We explain why these effects should
be observed in the quantum dynamics.
PACs: 32.80.Rm, 33.40.+f, 34.10.+x, 05.45.Ac, 05.45.MtComment: 47 pages, 20 figure
An unusual case of acute pulmonary embolism
Patiant with a history of hypertension presented to the emergency room with progressive dyspnoea over afew weeks. There was no relevant past history. Clinical examination revealed an elevated jugular venous pressure, pedal oedema and tenderness in the right hypochondrium
Elucidating the role of hyperfine interactions on organic magnetoresistance using deuterated aluminium tris(8-hydroxyquinoline)
Measurements of the effect of a magnetic field on the light output and
current through an organic light emitting diode made with deuterated aluminium
tris(8-hydroxyquinoline) have shown that hyperfine coupling with protons is not
the cause of the intrinsic organic magnetoresistance. We suggest that
interactions with unpaired electrons in the device may be responsible.Comment: Submitte
Step Position Distributions and the Pairwise Einstein Model for Steps on Crystal Surfaces
The Pairwise Einstein Model (PEM) of steps not only justifies the use of the
Generalized Wigner Distribution (GWD) for Terrace Width Distributions (TWDs),
it also predicts a specific form for the Step Position Distribution (SPD),
i.e., the probability density function for the fluctuations of a step about its
average position. The predicted form of the SPD is well approximated by a
Gaussian with a finite variance. However, the variance of the SPD measured from
either real surfaces or Monte Carlo simulations depends on , the
length of step over which it is calculated, with the measured variance
diverging in the limit . As a result, a length scale
can be defined as the value of at which the measured and
theoretical SPDs agree. Monte Carlo simulations of the terrace-step-kink model
indicate that , where is the correlation
length in the direction parallel to the steps, independent of the strength of
the step-step repulsion. can also be understood as the length over
which a {\em single} terrace must be sampled for the TWD to bear a "reasonable"
resemblence to the GWD.Comment: 4 pages, 3 figure
AGN and starbursts at high redshift: High resolution EVN radio observations of the Hubble Deep Field
We present deep, wide-field European VLBI Network (EVN) 1.6 GHz observations
of the Hubble Deep Field (HDF) region with a resolution of 0.025 arcseconds.
Above the 210 microJy/beam (5sigma) detection level, the EVN clearly detects
two radio sources in a field that encompasses the HDF and part of the Hubble
Flanking Fields (HFF). The sources detected are: VLA J123644+621133 (a z=1.013,
low-luminosity FR-I radio source located within the HDF itself) and VLA
J123642+621331 (a dust enshrouded, optically faint, z=4.424 starburst system).
A third radio source, J123646+621404, is detected at the 4sigma level. The VLBI
detections of all three sources suggest that most of the radio emission of
these particular sources (including the dusty starburst) is generated by an
embedded AGN.Comment: 4 pages, 1 figure; Accepted by Astron. & Astrophys Letters ... See
http://www.nfra.nl/~mag/hdf_evn.htm
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