229 research outputs found
Alternative phosphorus sources for formulated fish feed
An experiment was conducted to evaluate the possibility of using inorganic fertilizer
triple super phosphate (TSP), inorganic fertilizer 16:20 (a 16:20 grade fertilizer contains
16 percent N and 20 percent P20 5), rice-bran and duck-manure as phosphorus sources in
formulated fish feed for Nile tilapia ( Oreochromis niloticus). Experiment was conducted
for a period of 2 months in net-cages suspended in fertilized earthen ponds and all male
sex-reversed Nile tilapia (9.39- 10.37 g) were used in the experiment. Seven treatments
including one non-feed treatment were used in this experiment. Treatment 1 (non-feed),
treatment 2 (-P) where fish fed with phosphorus non-supplemented diet acted as control
1 and treatment 3, 4, 5, 6 and 7 where fish fed with 3% di-calcium phosphate (DCP), 3%
triple supper phosphate (TSP), 7% 16:20 inorganic fertilizer, 30% rice-bran and 30%
duck-manure supplemented diet, respectively. Results showed that the TSP and 16:20
grade inorganic fertilizer supplementation in diets as phosphorus sources were
equivalent to DCP (Di-calcium phosphate) supplementation in terms of growth
performance, feed utilization efficiency and final body composition of Nile tilapia. Ricebran
and duck-manure were not found as good phosphorus sources
Effect of phosphorous supplementation in the formulated fish feed on carcass quality of Nile tilapia Oreochromis niloticus L.
A study was conducted to evaluate the effect of phosphorus supplementation in the
formulated fish diet on carcass quality of Nile tilapia in net-cages suspended in fertilized
earthen ponds. In the experiment 3% di-calcium phosphate (DCP), 3% triple supper
phosphate (TSP) and 7% 16:20 inorganic fertilizer were added as phosphorous sources to
three diets containing fish meal as main protein ingredient. Feeding tilapia in net-cages
with these diets significantly (p<O.OS) improved the carcass quality and bone
phosphorous content of Nile tilapia over fish fed with same diet without phosphorous
supplementation and fish given no feed. The final body composition and bone
phosphorous content of Nile tilapia fed with DCP, TSP and 16:20 grade fertilizer
supplemented diets were comparable
Calculation of electron mobility and effect of dislocation scattering in GaN
The electron mobility of GaN has been obtained at various temperatures by the
relaxation time approximation method. The effect of dislocation scattering has also been
discussed and calculated alongwith other important scattering mechanisms in this
material. The results agree with other available experimental and theoretical data
Dynamical Casimir effect without boundary conditions
The moving-mirror problem is microscopically formulated without invoking the
external boundary conditions. The moving mirrors are described by the quantized
matter field interacting with the photon field, forming dynamical cavity
polaritons: photons in the cavity are dressed by electrons in the moving
mirrors. The effective Hamiltonian for the polariton is derived, and
corrections to the results based on the external boundary conditions are
discussed.Comment: 12 pages, 2 figure
Exact diagonalization of the generalized supersymmetric t-J model with boundaries
We study the generalized supersymmetric model with boundaries in three
different gradings: FFB, BFF and FBF. Starting from the trigonometric R-matrix,
and in the framework of the graded quantum inverse scattering method (QISM), we
solve the eigenvalue problems for the supersymmetric model. A detailed
calculations are presented to obtain the eigenvalues and Bethe ansatz equations
of the supersymmetric model with boundaries in three different
backgrounds.Comment: Latex file, 32 page
Radiative Decay of a Long-Lived Particle and Big-Bang Nucleosynthesis
The effects of radiatively decaying, long-lived particles on big-bang
nucleosynthesis (BBN) are discussed. If high-energy photons are emitted after
BBN, they may change the abundances of the light elements through
photodissociation processes, which may result in a significant discrepancy
between the BBN theory and observation. We calculate the abundances of the
light elements, including the effects of photodissociation induced by a
radiatively decaying particle, but neglecting the hadronic branching ratio.
Using these calculated abundances, we derive a constraint on such particles by
comparing our theoretical results with observations. Taking into account the
recent controversies regarding the observations of the light-element
abundances, we derive constraints for various combinations of the measurements.
We also discuss several models which predict such radiatively decaying
particles, and we derive constraints on such models.Comment: Published version in Phys. Rev. D. Typos in figure captions correcte
Single Spin Asymmetry in Polarized Proton-Proton Elastic Scattering at GeV
We report a high precision measurement of the transverse single spin
asymmetry at the center of mass energy GeV in elastic
proton-proton scattering by the STAR experiment at RHIC. The was measured
in the four-momentum transfer squared range \GeVcSq, the region of a significant interference between the
electromagnetic and hadronic scattering amplitudes. The measured values of
and its -dependence are consistent with a vanishing hadronic spin-flip
amplitude, thus providing strong constraints on the ratio of the single
spin-flip to the non-flip amplitudes. Since the hadronic amplitude is dominated
by the Pomeron amplitude at this , we conclude that this measurement
addresses the question about the presence of a hadronic spin flip due to the
Pomeron exchange in polarized proton-proton elastic scattering.Comment: 12 pages, 6 figure
Search for the standard model Higgs boson decaying into two photons in pp collisions at sqrt(s)=7 TeV
A search for a Higgs boson decaying into two photons is described. The
analysis is performed using a dataset recorded by the CMS experiment at the LHC
from pp collisions at a centre-of-mass energy of 7 TeV, which corresponds to an
integrated luminosity of 4.8 inverse femtobarns. Limits are set on the cross
section of the standard model Higgs boson decaying to two photons. The expected
exclusion limit at 95% confidence level is between 1.4 and 2.4 times the
standard model cross section in the mass range between 110 and 150 GeV. The
analysis of the data excludes, at 95% confidence level, the standard model
Higgs boson decaying into two photons in the mass range 128 to 132 GeV. The
largest excess of events above the expected standard model background is
observed for a Higgs boson mass hypothesis of 124 GeV with a local significance
of 3.1 sigma. The global significance of observing an excess with a local
significance greater than 3.1 sigma anywhere in the search range 110-150 GeV is
estimated to be 1.8 sigma. More data are required to ascertain the origin of
this excess.Comment: Submitted to Physics Letters
Measurement of isolated photon production in pp and PbPb collisions at sqrt(sNN) = 2.76 TeV
Isolated photon production is measured in proton-proton and lead-lead
collisions at nucleon-nucleon centre-of-mass energies of 2.76 TeV in the
pseudorapidity range |eta|<1.44 and transverse energies ET between 20 and 80
GeV with the CMS detector at the LHC. The measured ET spectra are found to be
in good agreement with next-to-leading-order perturbative QCD predictions. The
ratio of PbPb to pp isolated photon ET-differential yields, scaled by the
number of incoherent nucleon-nucleon collisions, is consistent with unity for
all PbPb reaction centralities.Comment: Submitted to Physics Letters
J/ψ polarization in p+p collisions at s=200 GeV in STAR
AbstractWe report on a polarization measurement of inclusive J/ψ mesons in the di-electron decay channel at mid-rapidity at 2<pT<6 GeV/c in p+p collisions at s=200 GeV. Data were taken with the STAR detector at RHIC. The J/ψ polarization measurement should help to distinguish between different models of the J/ψ production mechanism since they predict different pT dependences of the J/ψ polarization. In this analysis, J/ψ polarization is studied in the helicity frame. The polarization parameter λθ measured at RHIC becomes smaller towards high pT, indicating more longitudinal J/ψ polarization as pT increases. The result is compared with predictions of presently available models
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