678 research outputs found
System size and beam energy dependence of azimuthal anisotropy from PHENIX
We present azimuthal anisotropy measurements in Au+Au and Cu+Cu collisions at
= 62.4 and 200 GeV. Comparison between reaction plane and
cumulant measurements in Au+Au collisions at = 200 GeV
show that non-flow contributions, originating mainly from jets, influence the
extracted for 3.5 GeV/c. Number of constituent quark
(NCQ) scaling of , when studied as a function of transverse kinetic energy
, is seen to hold for Au+Au collisions at = 62.4 and 200
GeV and for Cu+Cu collisions at = 200 GeV for
1 GeV/c. Differential hexadecupole flow seems to exhibit
scaling with integral for centrality 40% as has been observed for
differential .Comment: 4 pages, 3 figures, Proceedings of the QM2008 Conference, Jaipur,
India February 4-10 200
Universal scaling of the elliptic flow data at RHIC
Recent PHOBOS measurements of the excitation function for the pseudo-rapidity
dependence of elliptic flow in Au+Au collisions at RHIC, have posed a
significant theoretical challenge. Here we show that these differential
measurements, as well as the RHIC measurements on transverse momentum satisfy a
universal scaling relation predicted by the Buda-Lund model, based on exact
solutions of perfect fluid hydrodynamics. We also show that recently found
transverse kinetic energy scaling of the elliptic flow is a special case of
this universal scaling.Comment: 4 pages, 3 figures, 1 tabl
Decomposition of Harmonic and Jet Contributions to Particle-pair Correlations at Ultra-relativistic Energies
Methodology is presented for analysis of two-particle azimuthal angle
correlation functions obtained in collisions at ultra-relativistic energies. We
show that harmonic and di-jet contributions to these correlation functions can
be reliably decomposed by two techniques to give an accurate measurement of the
jet-pair distribution. Results from detailed Monte Carlo simulations are used
to demonstrate the efficacy of these techniques in the study of possible
modifications to jet topologies in heavy ion reactions.Comment: Updated version to be published in PRC Rapid Com
Optimum temperature and stocking density for transportation of tilapia (Oreochromis niloticus) broodstock in the semi-arid zone of Nigeria
Oreochromis niloticus broodstock of mean weight 32.3g were cropped in the morning with dragnet from a 1 ha reservoir and transported in round tanks to the Hatchery complex of the National Institute for Freshwater Fisheries Research where they were stocked into 5m x 5m indoor concrete tanks filled with clean water and with aerators at a density of 4 fish/m1. They were acclimated for 5 days and then packaged into 60 liter capacity water proof bags at the following stocking densities: 60, 80, 100, 120, 140 fish/60 lit bag. Each stocking density had bags with ice blocks and bags without ice blocks in triplicate. The water proof bags were oxygenated, loaded into quick fitting plastic bowls and transported in a bus from New Bussa to Warra, Kebbi state, a journey of 3 hours. The trip was repeated four times. Percentage survival in bags with ice block were 100%for stocking densities 60, 80, 100 fish/60 lit bag, 95.1%for 120 fish/60 lit bag and 84. 7%for 1-10 fish/60 lit bag (mean temperature 23.5~?C). Mortalities were recorded in all the bags without ice block but the highest survival was in the bag with stocking density 60fish/60 lit bag (mean temperature 29.2~?C)
Has the QCD Critical Point been Signaled by Observations at RHIC ?
The shear viscosity to entropy ratio () is estimated for the hot and
dense QCD matter created in Au+Au collisions at RHIC ( GeV).
A very low value is found , which is close to the conjectured
lower bound (). It is argued that such a low value is indicative of
thermodynamic trajectories for the decaying matter which lie close to the QCD
critical end point.Comment: 4 pages, 3 figures. Revised version, accepted for publication in PR
Excitation functions of baryon anomaly and freeze-out properties at RHIC-PHENIX
The intermediate region (2 - 5 GeV/) in central Au+Au collisions at
RHIC has a rich physics content. The (anti)proton to pion ratio at the
intermediate gives us a powerful tool to investigate the bulk properties
of the hot and dense matter created at RHIC and their hadronization processes.
We present the preliminary results of identified charged hadron spectra at the
lower beam energies at RHIC. The excitation function of (anti)proton to pion
ratios from SPS to RHIC are shown. We also discuss the onset of the baryon
enhancement at the high energy heavy ion collisions.Comment: 4 pages, 3 figures, Quark Matter 2006 conference proceeding
Study of the relationship between HPA-1 and HPA-5 gene polymorphisms and refractory to platelet therapy and recombinant factor VII in glanzmann thrombasthenia patients in Southeast of Iran
Background: Glanzmann Thrombasthenia (GT) is a rare autosomal disease. HPA (Human Platelet Alloantigen) is a surface polymorphic alloantigen of platelets. This study was intended to investigate and compare the polymorphism of HPA-1 and HPA-5 genes in two groups of GT patients, with and without resistance to platelet and recombinant factor VII therapy. Materials and Methods: This case control study was performed on GT patients (n=16) with resistance to platelet therapy and recombinant factor VII and control group of GT patients (n=16) without resistance to platelet therapy and recombinant factor VII. The consent form was completed by each patient. Gene polymorphisms of HPA-1 and HPA-5 were investigated using SSP-PCR, and the obtained data were analyzed using statistical software SPSS16.0. Results: The results indicated no significant relationship between the studied genes and their resistance to platelet therapy and recombinant factor VII. The frequencies of HPA-1 genotype a/a were 98 and 94 in patient and control groups, respectively. The frequency of allele b was found to be less than allele a. The value of this allele was 4 in patient group and 1 in control group. In addition, the HPA-5a/a (98) was the most frequent alloantigen?? (check it) in both groups. Seven percent (7) of the patients had the HPA-5a/b genotype, and the HPA-5b/b was found to be absent in these individuals. Conclusion: According to the results obtained, it could be concluded that these genes play no role in resistance to platelet therapy. © 2018, Tehran University of Medical Sciences (TUMS). All rights reserved
Multiparticle angular correlations: a probe for the sQGP at RHIC
A novel decomposition technique is used to extract the centrality dependence
of di-jet properties and yields from azimuthal correlation functions obtained
in Au+Au collisions at =200 GeV. The width of the
near-side jet shows very little dependence on centrality. In contrast, the
away-side jet indicates substantial broadening as well as hints for for a local
minimum at for central and mid-central events. The yield of
jet-pairs (per trigger particle) slowly increases with centrality for both the
near- and away-side jets. These observed features are compatible with several
recent theoretical predictions of possible modifications of di-jet
fragmentation by a strongly interacting medium. Several new experimental
approaches, including the study of flavor permutation and higher order
multi-particle correlations, that might help to distinguish between different
theoretical scenarios are discussed.Comment: Proceedings of the MIT workshop on correlations and fluctation
Legume based pasture rejuvenation for greenhouse gas outcomes
Non-Peer ReviewedIncorporating legumes into a grass based pasture system has multiple benefits. A grass/legume blend increases the dietary protein of foraging cattle over grass alone. Furthermore, symbiotic biological nitrogen fixation introduces additional nitrogen to the pasture system thereby potentially lessening the need for synthetic fertilizers. However, over time, pastures initially seeded with a blend of grasses and legumes will tend towards increasing grass dominance such that the presence and benefits of legumes diminishes. Reestablishing legumes on a mature pasture can restore these important functions. By improving ruminant diet and therefore feed conversion ratios as well as decreasing nitrogen fertilizer applications, pasture rejuvenation, through the introduction of legumes, is expected to lower the greenhouse gas cost of grazing livestock on a per output basis. However, disturbance of soils, which can be part of various rejuvenation techniques, can result in losses of soil carbon thereby offsetting potential at least some of the greenhouse gas benefits. Sod-seeding may be an effective strategy to establish legumes in a mature pasture thereby incurring benefits without heavily disrupting soils and incurring soil carbon loss. To test this, a multiyear experiment, including cattle, vegetation (specifically the incorporation of non-bloat legumes: cicer milkvetch and sainfoin), soils and microbiota, was established near Lanigan, SK to examine the impact of sod-seeded legume pasture rejuvenation on greenhouse gases
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