449 research outputs found
Spawning and hatching performance of the silvery black porgy Sparidentex hasta under hypersaline conditions
Abu Al Abyad island is characterized by harsh environmental conditions. A preliminary trial conducted at the island to investigate the spawning and hatching performance of the blue finned sea bream Sparidentex hasta indicated that the fish can be successfully bred at high salinity levels exceeding 50 ppt
Spawning and hatching performance of the silvery black porgy Sparidentex hasta under hypersaline conditions
Abu Al Abyad island is characterized by harsh environmental conditions. A preliminary trial conducted at the island to investigate the spawning and hatching performance of the blue finned sea bream Sparidentex hasta indicated that the fish can be successfully bred at high salinity levels exceeding 50 ppt.Salinity tolerance, Spawning, Hatching, United Arab Emirates, Sparidentex hasta
The QCD equation of state at nonzero densities: lattice result
In this letter we give the equation of state of QCD at finite temperatures
and densities. The recently proposed overlap improving multi-parameter
reweighting technique is used to determine observables at nonvanishing chemical
potentials. Our results are obtained by studying n_f=2+1 dynamical staggered
quarks with semi-realistic masses on N_t=4 lattices.Comment: 5 pages, 6 figure
The QCD transition temperature: results with physical masses in the continuum limit
The transition temperature () of QCD is determined by Symanzik improved
gauge and stout-link improved staggered fermionic lattice simulations. We use
physical masses both for the light quarks () and for the strange quark
(). Four sets of lattice spacings (=4,6,8 and 10) were used to carry
out a continuum extrapolation. It turned out that only =6,8 and 10 can be
used for a controlled extrapolation, =4 is out of the scaling region.
Since the QCD transition is a non-singular cross-over there is no unique .
Thus, different observables lead to different numerical values even in
the continuum and thermodynamic limit. The peak of the renormalized chiral
susceptibility predicts =151(3)(3) MeV, wheres -s based on the
strange quark number susceptibility and Polyakov loops result in 24(4) MeV and
25(4) MeV larger values, respectively. Another consequence of the cross-over is
the non-vanishing width of the peaks even in the thermodynamic limit, which we
also determine. These numbers are attempted to be the full result for the
0 transition, though other lattice fermion formulations (e.g. Wilson)
are needed to cross-check them.Comment: 13 pages 5 figures. Final version, published in Phys.Lett.
Characterisation and use of glass fibre reinforced plastic waste powder as filler in styrene-butadiene rubber
Glass fibre reinforced plastic (GRP) wastes are often disposed of in landfill,
incinerated or processed into powders. GRP waste powders can be recycled as filler in
virgin polymers and should be characterised before they are added to avoid processing
problems. A GRP waste powder was characterised using advanced measuring and
analytical techniques. These included, scanning electron microscopy, Fourier
transform infrared spectrometry, particle size analyser, differential scanning
calorimetry, X-ray photo-electron spectroscopy and energy dispersive X-ray
microanalyser. The results showed that the waste powder consisted of irregular
shaped particles and glass fibre fragments up to 700 m in size. Moreover, the waste
powder was a thermoset polyester resin and its chemical constituents were calcium,
oxygen, aluminium, silica, chlorine, bromine and carbon. When up to 25 parts per
hundred rubber by weight of the GRP waste powder was mixed with a sulphur cure-
based styrene-butadiene rubber, the viscosity, scorch and optimum cure times
increased, and the rate of cure decreased. The tearing energy, elongation at break,
tensile strength, stored energy density at break, and Young’s modulus of the
vulcanisate improved as the loading of the waste powder was raised
Characterisation and use of glass fibre reinforced plastic waste powder as filler in styrene-butadiene rubber
Glass fibre reinforced plastic (GRP) wastes are often disposed of in landfill,
incinerated or processed into powders. GRP waste powders can be recycled as filler in
virgin polymers and should be characterised before they are added to avoid processing
problems. A GRP waste powder was characterised using advanced measuring and
analytical techniques. These included, scanning electron microscopy, Fourier
transform infrared spectrometry, particle size analyser, differential scanning
calorimetry, X-ray photo-electron spectroscopy and energy dispersive X-ray
microanalyser. The results showed that the waste powder consisted of irregular
shaped particles and glass fibre fragments up to 700 m in size. Moreover, the waste
powder was a thermoset polyester resin and its chemical constituents were calcium,
oxygen, aluminium, silica, chlorine, bromine and carbon. When up to 25 parts per
hundred rubber by weight of the GRP waste powder was mixed with a sulphur cure-
based styrene-butadiene rubber, the viscosity, scorch and optimum cure times
increased, and the rate of cure decreased. The tearing energy, elongation at break,
tensile strength, stored energy density at break, and Young’s modulus of the
vulcanisate improved as the loading of the waste powder was raised
Parametrization for the Scale Dependent Growth in Modified Gravity
We propose a scale dependent analytic approximation to the exact linear
growth of density perturbations in Scalar-Tensor (ST) cosmologies. In
particular, we show that on large subhorizon scales, in the Newtonian gauge,
the usual scale independent subhorizon growth equation does not describe the
growth of perturbations accurately, as a result of scale-dependent relativistic
corrections to the Poisson equation. A comparison with exact linear numerical
analysis indicates that our approximation is a significant improvement over the
standard subhorizon scale independent result on large subhorizon scales. A
comparison with the corresponding results in the Synchronous gauge demonstrates
the validity and consistency of our analysis.Comment: 10 pages, 5 figures. Minor modifications and references added to
match published versio
D* Production in Deep Inelastic Scattering at HERA
This paper presents measurements of D^{*\pm} production in deep inelastic
scattering from collisions between 27.5 GeV positrons and 820 GeV protons. The
data have been taken with the ZEUS detector at HERA. The decay channel
(+ c.c.) has been used in the study. The
cross section for inclusive D^{*\pm} production with
and is 5.3 \pms 1.0 \pms 0.8 nb in the kinematic region
{ GeV and }. Differential cross
sections as functions of p_T(D^{*\pm}), and are
compared with next-to-leading order QCD calculations based on the photon-gluon
fusion production mechanism. After an extrapolation of the cross section to the
full kinematic region in p_T(D^{*\pm}) and (D^{*\pm}), the charm
contribution to the proton structure function is
determined for Bjorken between 2 10 and 5 10.Comment: 17 pages including 4 figure
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