3,349 research outputs found
PACIAE 2.0: An updated parton and hadron cascade model (program) for the relativistic nuclear collisions
We have updated the parton and hadron cascade model PACIAE for the
relativistic nuclear collisions, from based on JETSET 6.4 and PYTHIA 5.7 to
based on PYTHIA 6.4, and renamed as PACIAE 2.0. The main physics concerning the
stages of the parton initiation, parton rescattering, hadronization, and hadron
rescattering were discussed. The structures of the programs were briefly
explained. In addition, some calculated examples were compared with the
experimental data. It turns out that this model (program) works well.Comment: 23 pages, 7 figure
Enhancement of singly and multiply strangeness in p-Pb and Pb-Pb collisions at 158A GeV/c
The idea that the reduction of the strange quark suppression in string
fragmentation leads to the enhancement of strange particle yield in
nucleus-nucleus collisions is applied to study the singly and multiply strange
particle production in p-Pb and Pb-Pb collisions at 158A GeV/c. In this
mechanism the strange quark suppression factor is related to the effective
string tension, which increases in turn with the increase of the energy, of the
centrality and of the mass of colliding system. The WA97 observation that the
strange particle enhancement increases with the increasing of centrality and of
strange quark content in multiply strange particles in Pb-Pb collisions with
respect to p-Pb collisions was accounted reasonably.Comment: 8 pages, 3 PostScript figures, in Latex form. submitted to PR
Charged particle elliptic flow in p+p collisions at LHC energies in a transport model PACIAE
The parton and hadron cascade model PACIAE based on PYTHIA was used to
investigate the charged particle elliptic flow in minimum bias pp collisions at
the LHC energies. The strings were distributed randomly in the transverse
ellipsoid of the pp collision system with major axis of (proton radius) and
minor axis of before parton rescattering. The charged particle
elliptic flow as a function of the random number and transverse momentum
were investigated. The calculated as a function of
reaction energy increases monotonously with increasing reaction energy up to
7 TeV and then turns to saturation. With the parton-parton cross
section enlarges three times in parton rescattering, the rapidity integrated
charged particle elliptic flow may reach 0.025 at 2 GeV/c in the
minimum bias pp collisions at =7 TeV.Comment: 7 pages, 4 figure
The Effect of Dynamical Parton Recombination on Event-by-Event Observables
Within a dynamical quark recombination model we explore various proposed
event-by-event observables sensitive to the microscopic structure of the
QCD-matter created at RHIC energies. Charge fluctuations, charge transfer
fluctuations and baryon-strangeness correlations are computed from a sample of
central Au+Au events at the highest RHIC energy available (=200
GeV). We find that for all explored observables, the calculations yield the
values predicted for a quark-gluon plasma only at early times of the evolution,
whereas the final state approaches the values expected for a hadronic gas. We
argue that the recombination-like hadronization process itself is responsible
for the disappearance of the predicted deconfinement signatures. This might
explain why no fluctuation signatures for the transition between quark and
hadronic matter was ever observed in the experimental data up to now. However,
it might also be interpreted as a clear indication for a recombination like
hadronization process at RHIC.Comment: 5 page
ABJM Dibaryon Spectroscopy
We extend the proposal for a detailed map between wrapped D-branes in Anti-de
Sitter space and baryon-like operators in the associated dual conformal field
theory provided in hep-th/0202150 to the recently formulated AdS_4 \times
CP^3/ABJM correspondence. In this example, the role of the dibaryon operator of
the 3-dimensional CFT is played by a D4-brane wrapping a CP^2 \subset CP^3.
This topologically stable D-brane in the AdS_4 \times CP^3 is nothing but
one-half of the maximal giant graviton on CP^3.Comment: 26 page
Elderly Patients Undergone Hematopoietic Stem Cell Transplantation: Body Composition and Engraftment
Univ Fed Sao Paulo, Endocrinol, Sao Paulo, BrazilHosp Israelita Albert Einstein, Oncol & Hematol, Sao Paulo, BrazilHosp Israelita Albert Einstein, Sao Paulo, BrazilHosp Israelita Albert Einstein, Dept Hematol & Oncol, Sao Paulo, BrazilHosp Israelita Albert Einstein, BMT, Sao Paulo, BrazilUniv Fed Sao Paulo, Endocrinol, Sao Paulo, BrazilWeb of Scienc
Restoration of beta-adrenergic signaling in failing cardiac ventricular myocytes via adenoviral-mediated gene transfer.
Cardiovascular gene therapy is a novel approach to the treatment of diseases such as congestive heart failure (CHF). Gene transfer to the heart would allow for the replacement of defective or missing cellular proteins that may improve cardiac performance. Our laboratory has been focusing on the feasibility of restoring beta-adrenergic signaling deficiencies that are a characteristic of chronic CHF. We have now studied isolated ventricular myocytes from rabbits that have been chronically paced to produce hemodynamic failure. We document molecular beta-adrenergic signaling defects including down-regulation of myocardial beta-adrenergic receptors (beta-ARs), functional beta-AR uncoupling, and an up-regulation of the beta-AR kinase (betaARK1). Adenoviral-mediated gene transfer of the human beta2-AR or an inhibitor of betaARK1 to these failing myocytes led to the restoration of beta-AR signaling. These results demonstrate that defects present in this critical myocardial signaling pathway can be corrected in vitro using genetic modification and raise the possibility of novel inotropic therapies for CHF including the inhibition of betaARK1 activity in the heart
Fluctuations of conserved charges at finite temperature from lattice QCD
We present the full results of the Wuppertal-Budapest lattice QCD
collaboration on flavor diagonal and non-diagonal quark number susceptibilities
with 2+1 staggered quark flavors, in a temperature range between 125 and 400
MeV. The light and strange quark masses are set to their physical values.
Lattices with Nt=6, 8, 10, 12, 16 are used. We perform a continuum
extrapolation of all observables under study. A Symanzik improved gauge and a
stout-link improved staggered fermion action is utilized. All results are
compared to the Hadron Resonance Gas model predictions: good agreement is found
in the temperature region below the transition.Comment: 13 pages, 8 figures in Jhep styl
An integrated gene annotation and transcriptional profiling approach towards the full gene content of the Drosophila genome
BACKGROUND: While the genome sequences for a variety of organisms are now available, the precise number of the genes encoded is still a matter of debate. For the human genome several stringent annotation approaches have resulted in the same number of potential genes, but a careful comparison revealed only limited overlap. This indicates that only the combination of different computational prediction methods and experimental evaluation of such in silico data will provide more complete genome annotations. In order to get a more complete gene content of the Drosophila melanogaster genome, we based our new D. melanogaster whole-transcriptome microarray, the Heidelberg FlyArray, on the combination of the Berkeley Drosophila Genome Project (BDGP) annotation and a novel ab initio gene prediction of lower stringency using the Fgenesh software. RESULTS: Here we provide evidence for the transcription of approximately 2,600 additional genes predicted by Fgenesh. Validation of the developmental profiling data by RT-PCR and in situ hybridization indicates a lower limit of 2,000 novel annotations, thus substantially raising the number of genes that make a fly. CONCLUSIONS: The successful design and application of this novel Drosophila microarray on the basis of our integrated in silico/wet biology approach confirms our expectation that in silico approaches alone will always tend to be incomplete. The identification of at least 2,000 novel genes highlights the importance of gathering experimental evidence to discover all genes within a genome. Moreover, as such an approach is independent of homology criteria, it will allow the discovery of novel genes unrelated to known protein families or those that have not been strictly conserved between species
Drop Traffic in Microfluidic Ladder Networks with Fore-Aft Structural Asymmetry
We investigate the dynamics of pairs of drops in microfluidic ladder networks
with slanted bypasses, which break the fore-aft structural symmetry. Our
analytical results indicate that unlike symmetric ladder networks, structural
asymmetry introduced by a single slanted bypass can be used to modulate the
relative drop spacing, enabling them to contract, synchronize, expand, or even
flip at the ladder exit. Our experiments confirm all these behaviors predicted
by theory. Numerical analysis further shows that while ladder networks
containing several identical bypasses are limited to nearly linear
transformation of input delay between drops, mixed combination of bypasses can
cause significant non-linear transformation enabling coding and decoding of
input delays.Comment: 4 pages, 5 figure
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