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Search Results: 1 - 10 of 22219 matches for " Eduardo;Averbeck "
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Heavy-flavor production at RHIC
Ralf Averbeck
Physics , 2005,
Abstract: Experimental results on heavy-quark production in proton-proton, deuteron-gold, and gold-gold collisions at sqrt(s_(NN)) = 200 GeV at the Relativistic Heavy Ion Collider (RHIC) are reviewed.
Neutral pions and eta mesons as probes of the expanding hadronic fireball in nucleus-nucleus collisions at SIS
Ralf Averbeck
Physics , 1998,
Abstract: The production of neutral pions and eta mesons in collisions of light, intermediate-mass, and heavy nuclei at beam energies between 0.8 A GeV and 2.0 A GeV is discussed in the framework of a model assuming equilibrium at hadrochemical and thermal freeze-out, respectively. From the relative particle yields temperatures of 56-90 MeV and baryon chemical potentials of 780-675 MeV are deduced at chemical freeze-out. Midrapidity spectra of neutral pions and eta mesons are consistent with the obtained temperatures if, in addition, the measured transverse expansion of the collision zone is taken into account. In contrast to results from similar analyses of AGS and SPS data the deduced freeze-out parameters are far below the phase boundary between a hadron gas and a quark-gluon plasma.
Heavy-flavor production in heavy-ion collisions and implications for the properties of hot QCD matter
R. Averbeck
Physics , 2015, DOI: 10.1016/j.ppnp.2013.01.001
Abstract: Hadrons carrying open heavy flavor, i.e. single charm or bottom quarks, are among the key diagnostic tools available today for the hot and dense state of strongly interacting matter which is produced in collisions of heavy atomic nuclei at ultra-relativistic energies. First systematic heavy-flavor measurements in nucleus-nucleus collisions and the reference proton-proton system at Brookhaven National Laboratory's (BNL) Relativistic Heavy Ion Collider (RHIC) have led to tantalizing results. These studies are now continued and extended at RHIC and at CERN's Large Hadron Collider (LHC), where considerably higher collision energies are available. This review focuses on experimental results on open heavy-flavor observables at RHIC and the LHC published until July 2012. Yields of heavy-flavor hadrons and their decay products, their transverse momentum and rapidity distributions, as well as their azimuthal distributions with respect to the reaction plane in heavy-ion collisions are investigated. Various theoretical approaches are confronted with the data and implications for the properties of the hot and dense medium produced in ultra-relativistic heavy-ion collisions are discussed.
Long-term follow-up of penile curvature correction utilizing autologous albugineal crural graft
Da Ros, Carlos Teodósio;Graziottin, Túlio Meyer;Ribeiro, Eduardo;Averbeck, Márcio Augusto;
International braz j urol , 2012, DOI: 10.1590/S1677-55382012000200013
Abstract: purpose: peyronie's disease is an acquired connective tissue disorder of the penile tunica albuginea with fibrosis and inflammation. the disease produces palpable plaques, penile curvature and pain during erections. usually it results in impairment of the quality of life. our objective is to review the long-term results of the albugineal grafting harvested from the penile crura for the treatment of severe penile curvature. materials and methods: thirty-three patients with peyronie's disease were submitted to a grafting with tunica albuginea from the penile crura for the correction of penile curvature. the results were evaluated after 6 months of the procedure. variables studied were overall satisfaction with the procedure, correction of the penile curvature, erectile capacity, penile shortening and the presence of surgical complications. results: mean follow-up after surgery was 41 months. complete correction of the curvature was achieved in 30 patients (90%). the mean preoperative curvature was 91.8 degrees and median plaque length was 2 cm (ranged from 1 to 5 cm). three patients (9%) experienced recurrence of the penile curvature and required a new procedure. in 30 men (90%) the procedure fulfilled their expectations and in 31 patients (93.9%) their opinions were that sexual partners were satisfied with the penile correction. penile shortening or augmentation was referred in 6 (18.1%) and 1 (3%) patient, respectively. conclusion: our series demonstrated that grafting the albugineal defect after incision of the tunica albuginea with tunica from the crus for the correction of penile curvature is safe and results in satisfactory straight erections duringa long-term follow-up.
Open heavy flavor measurements with the PHENIX experiment at RHIC
Ralf Averbeck,for the PHENIX Collaboration
Physics , 2004, DOI: 10.1088/0954-3899/31/4/032
Abstract: The PHENIX experiment has measured single electron spectra at RHIC in proton-proton (p-p), deuteron-gold (d-Au), and gold-gold (Au-Au) collisions at an available energy per nucleon-nucleon pair of sqrt{s_NN} = 200 GeV. Contributions from photonic sources, i.e. Dalitz decays of light mesons and photon conversions, are subtracted from the inclusive spectra. The remaining non-photonic single electron spectra are dominated by semileptonic decays of particles carrying heavy flavor. Implications of these systematic measurements for heavy flavor production in cold and hot nuclear systems are discussed.
Single leptons from heavy-flavor decays at RHIC
Ralf Averbeck,for the PHENIX Collaboration
Physics , 2002, DOI: 10.1016/S0375-9474(02)01469-0
Abstract: Inclusive transverse momentum spectra of single electrons from Au+Au collisions have been measured at $\sqrt{s_{NN}}$ = 130 GeV and 200 GeV at midrapidity by the PHENIX experiment at RHIC. After subtraction of background from photon conversions and light hadron decays, the spectra appear consistent with semileptonic decays of charmed particles.
Heavy-flavour measurements in pp and Pb-Pb collisions with the ALICE experiment at the CERN LHC
Ralf Averbeck,for the ALICE Collaboration
Physics , 2012,
Abstract: The ALICE experiment at the CERN LHC has conducted first systematic studies of heavy-flavour hadron production in pp collisions at sqrt(s) = 7 TeV and in Pb-Pb collisions at sqrt(s_NN) = 2.76 TeV. In pp collisions the differential production cross sections of D mesons at mid-rapidity, as well as the cross sections for electrons and muons from semileptonic heavy-flavour hadron decays at mid- and forward-rapidity, respectively, have been measured. These data provide a crucial testing ground for perturbative QCD calculations in the new LHC energy regime. In Pb-Pb collisions, the nuclear modification factor R_AA(p_t) has been measured for D mesons and for leptons from heavy-flavour decays, indicating energy loss of heavy quarks in the partonic medium produced in Pb-Pb collisions at the LHC. The strong interaction of charm quarks with this medium might also generate a non-zero elliptic flow of D mesons as first studies of the azimuthal anisotropy of D^0-meson production suggest.
The Statistical Neuroanatomy of Frontal Networks in the Macaque
Bruno B. Averbeck ,Moonsang Seo
PLOS Computational Biology , 2008, DOI: 10.1371/journal.pcbi.1000050
Abstract: We were interested in gaining insight into the functional properties of frontal networks based upon their anatomical inputs. We took a neuroinformatics approach, carrying out maximum likelihood hierarchical cluster analysis on 25 frontal cortical areas based upon their anatomical connections, with 68 input areas representing exterosensory, chemosensory, motor, limbic, and other frontal inputs. The analysis revealed a set of statistically robust clusters. We used these clusters to divide the frontal areas into 5 groups, including ventral-lateral, ventral-medial, dorsal-medial, dorsal-lateral, and caudal-orbital groups. Each of these groups was defined by a unique set of inputs. This organization provides insight into the differential roles of each group of areas and suggests a gradient by which orbital and ventral-medial areas may be responsible for decision-making processes based on emotion and primary reinforcers, and lateral frontal areas are more involved in integrating affective and rational information into a common framework.
Constipation and LUTS: how do they affect each other?
Averbeck, Marcio A.;Madersbacher, Helmut;
International braz j urol , 2011, DOI: 10.1590/S1677-55382011000100003
Abstract: context: urinary bladder and rectum share a common embryological origin. their autonomic and somatic innervations have close similarities. moreover, the close proximity of these two organ systems could suggest that dysfunction in one may influence, also mechanically, the function of the other. therefore, it is not surprising that defecation problems and lower urinary tract symptoms (luts) occur together, as reported in the literature. objective: to study the relationship between constipation and luts focusing on what is evidence-based. evidence acquisition: we searched the medical literature analysis and retrieval system online (medline) database in february 2010 to retrieve english language studies (from 1997 to 2009) and the 2005, 2006 and 2007 abstract volumes of the european association of urology (eau), american urological association (aua) and international continence society (ics). evidence synthesis: we present the findings according to the studied population in four groups: (a) children, (b) middle-aged women, (c) elderly and (d) neuropathic patients. most published studies that correlated rectal and bladder dysfunction were carried out in children or in young women. on the other hand, there are few studies regarding the association between constipation and luts in the elderly and in neuropathic patients. conclusions: several studies in children documented that constipation is linked to urinary tract problems, including infections, enuresis, vesicoureteral reflux and upper renal tract dilatation. the underlying pathophysiology of these findings has not yet been clearly defined. studies in middle-aged women also support a high prevalence of constipation among patients suffering from urinary tract dysfunction. furthermore, an association between constipation and urinary incontinence, as well as between constipation and pelvic organ prolapse, has been suggested. the only prospective study in constipated elderly with concomitant luts demonstrates that the medic
A Selective Emotional Decision-Making Bias Elicited by Facial Expressions
Nicholas Furl, Shannon Gallagher, Bruno B. Averbeck
PLOS ONE , 2012, DOI: 10.1371/journal.pone.0033461
Abstract: Emotional and social information can sway otherwise rational decisions. For example, when participants decide between two faces that are probabilistically rewarded, they make biased choices that favor smiling relative to angry faces. This bias may arise because facial expressions evoke positive and negative emotional responses, which in turn may motivate social approach and avoidance. We tested a wide range of pictures that evoke emotions or convey social information, including animals, words, foods, a variety of scenes, and faces differing in trustworthiness or attractiveness, but we found only facial expressions biased decisions. Our results extend brain imaging and pharmacological findings, which suggest that a brain mechanism supporting social interaction may be involved. Facial expressions appear to exert special influence over this social interaction mechanism, one capable of biasing otherwise rational choices. These results illustrate that only specific types of emotional experiences can best sway our choices.
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