674,932 research outputs found
Low temperature vortex liquid states induced by quantum fluctuations in the quasi two dimensional organic superconductor kappa-(BEDT-TTF)_{2} Cu(NCS)_{2}
We report the transport properties in the vortex liquid states induced by
quantum fluctuations at low temperature in the layered organic superconductor
kappa-(BEDT-TTF)_{2} Cu(NCS)_{2}. A steep drop of the resistivity observed
below about 1 K separates the liquid state into two regions. In the low
resistance state at lower temperature, a finite resistivity with weak
temperature dependence persists down to 100 mK at least. The finite resistivity
in the vortex state at T ~= 0 K indicates the realization of quantum vortex
liquid assisted by the strong quantum fluctuations instead of the thermal one.
A possible origin for separating these liquid states is a remnant vortex
melting line at the original position, which is obscured and suppressed by the
quantum fluctuations. A non-linear behavior of the in-plane resistivity appears
at large current density in only the low resistance state, but not in another
vortex liquid state at higher temperature, where the thermal fluctuations are
dominant. The transport properties in the low resistance state are well
understood in the vortex slush concept with a short-range order of vortices.
Thus the low resistance state below 1 K is considered to be a novel quantum
vortex slush state.Comment: 7 pages, 5 figure
Conformal Maps to Multiply-Slit Domains and Applications
By exploiting conformal maps to vertically slit regions in the complex plane, a recently developed rational spectral method [Tee and Trefethen, 2006] is able to solve PDEs with interior layer-like behaviour using significantly fewer collocation points than traditional spectral methods. The conformal maps are chosen to 'enlarge the region of analyticity' in the solution: an idea which can be extended to other numerical methods based upon global polynomial interpolation. Here we show how such maps can be rapidly computed in both periodic and nonperiodic geometries, and apply them to some challenging differential equations
Equations for predicting airborne cleanliness in non-unidirectional airflow cleanrooms
Equations are derived in this paper for predicting the airborne concentration of particles and
microbe-carrying particles in non-unidirectional airflow cleanrooms during manufacturing. The
equations are obtained for a variety of ventilation systems with different configurations for mixing
fresh and recirculated air, air filter placements, and number and efficiency of air filters. The
variables in the equations are air supply rate, airborne dispersion rate of contamination from
machinery and people, surface deposition of particles from air, particle concentration in fresh makeup
air, proportion of make-up air, and air filter efficiencies. The equations are amenable to relatively
simple modification for the study of different cleanroom ventilation systems. The use of these
equations to investigate the effect of different configurations of ventilation systems and the relative
importance of the equation variables on airborne concentrations will be reported in a further paper
A rational spectral collocation method with adaptively transformed Chebyshev grid points
A spectral collocation method based on rational interpolants and adaptive grid points is presented. The rational interpolants approximate analytic functions with exponential accuracy by using prescribed barycentric weights and transformed Chebyshev points. The locations of the grid points are adapted to singularities of the underlying solution, and the locations of these singularities are approximated by the locations of poles of Chebyshev-Padé approximants. Numerical experiments on two time-dependent problems, one with finite time blow-up and one with a moving front, indicate that the method far outperforms the standard Chebyshev spectral collocation method for problems whose solutions have singularities in the complex plan close to [-1,1]
A Deep Optical Observation for an Enigmatic Unidentified Gamma-Ray Source 3EG J1835+5918
We report a deep optical imaging observation by the Subaru telescope for a
very soft X-ray source RX J1836.2+5925, which has been suspected to be an
isolated neutron star associated with the brightest as-yet unidentified EGRET
source outside the Galactic plane, 3EG J1835+5918. An extended source having a
complex, bipolar shape is found at B ~ 26, and this might be an extended pulsar
nebular whose flux is about 5-6 orders of magnitude lower than gamma-ray flux,
although finding a galaxy of this magnitude by chance in the error circle is of
order unity. We have found two even fainter, possibly point sources at B ~ 28,
although their detections are not firm because of low signal-to-noise. If the
extended object of B ~ 26 is a galaxy and not related to 3EG J1835+5918, a
lower limit on X-ray/optical flux ratio is set as f_X/f_B >~ 2700, giving a
further strong support of the neutron-star identification of 3EG J1835+5918.
Interestingly, if either of the two sources at B ~ 28 is the real counterpart
of RX J1836.2+5925 and thermal emission from the surface of an isolated neutron
star, the temperature and distance to the source become ~ 4 x 10^5K and ~300pc,
respectively, showing a striking similarity of its spectral energy distribution
to the proto-type radio-quiet gamma-ray pulsar Geminga. No detection of
nonthermal hard X-ray emission is consistent with the ASCA upper limit, if the
nonthermal flux of 3EG J1835+5918/RX J1836.2+5925 is at a similar level with
that of Gemiga.Comment: PASJ Letters in press. (Received March 26; Accepted May 17
Calculation of airborne cleanliness and air supply rate for non-unidirectional airflow cleanrooms
Equations have been recently derived by Whyte, Lenegan and Eaton for calculating the airborne
concentration of particles and microbe-carrying particles in non-unidirectional airflow cleanrooms.
These equations cover a variety of ventilation systems, and contain the variables of air supply rate,
airborne dispersion rate of contamination from machinery and people, surface deposition of particles
from the air, concentration of contamination in fresh make-up air, proportion of fresh air, and air
filter efficiencies. The relative importance of these variables is investigated in this present research
paper, with particular regard to the removal efficiency, location, and number of air filters. It was
shown that air filters were important in ensuring low levels of contamination in cleanrooms but the
types of filters specified in current cleanroom designs were very effective in ensuring a minimal
contribution to the cleanroom’s airborne contamination especially when a secondary filter is used in
addition to a primary and terminal filter. The most important determinants of airborne
contamination were the air supply rate and the dispersion rate of contamination within the
cleanroom, with a lesser effect from deposition of airborne particles onto cleanroom surfaces. The
information gathered confirmed the usefulness of the equation previously used by Whyte, Whyte,
Eaton and Lenegan to calculate the air supply rate required for a specified concentration of airborne
contamination
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