Hadronization via Recombination

The recombination model as a model for hadronization from a quark-gluon plasma has been recently revived since it has advantages in explaining several important features of the final state produced in heavy-ion collisions at RHIC, such as the constituent quark number scaling of the elliptic coefficient versus the transverse energy of identified hadrons, the bending shape of the $p_T$ spectrum of hadrons near 5 GeV/c, and the measured large value of baryon to meson ratio(of the order of unity) in the same $p_T$ range. We have developed a dynamic simulation model of heavy-ion collisions in which a quark-gluon plasma, starting from a certain initial condition, evolves hydrodynamically until it reaches the phase boundary, and then hadronizes by valence quark recombination. Rescattering after hadronization is described by UrQMD. We discuss some details of the model and report first, preliminary results.Comment: 6 pages, 3 figures, plenary talk at SQM2008 Conference(Beijing, China, Oct 6-10,2008

ETAA1 ensures proper chromosome segregation: A matter of S phase or mitosis?

ETAA1 activates the master checkpoint kinase ATR. Bass and Cortez (2019. J. Cell Biol. https://doi.org/10.1083/jcb.201810058) recently reported an intra-mitotic function of ETAA1 that safeguards chromosome stability. In this issue, Achuthankutty et al. (2019. J. Cell Biol. https://doi.org/10.1083/jcb.201905064) describe a mechanism controlling the ATR-activating potential of ETAA1 in S phase to preserve chromosome stability.Fil: González, Marina Alejandra. Consejo Nacional de Investigaciones Científicas y Técnicas. Oficina de Coordinación Administrativa Parque Centenario. Instituto de Investigaciones Bioquímicas de Buenos Aires. Fundación Instituto Leloir. Instituto de Investigaciones Bioquímicas de Buenos Aires; ArgentinaFil: Gottifredi, Vanesa. Consejo Nacional de Investigaciones Científicas y Técnicas. Oficina de Coordinación Administrativa Parque Centenario. Instituto de Investigaciones Bioquímicas de Buenos Aires. Fundación Instituto Leloir. Instituto de Investigaciones Bioquímicas de Buenos Aires; Argentin

Perpendicular-current Studies of Electron Transport Across Metal/Metal Interfaces

We review what we have learned about the scattering of electrons by the interfaces between two different metals (M1/M2) in the current-perpendicular-to-plane (CPP) geometry. In this geometry, the intrinsic quantity is the specific resistance, AR, the product of the area through which the CPP current flows times the CPP resistance. We describe results for both non-magnetic/non-magnetic (N1/N2) and ferromagnetic/non-magnetic (F/N) pairs. We focus especially upon cases where M1/M2 are lattice matched (i.e., have the same crystal structure and the same lattice parameters to within ~ 1%), because in these cases no-free-parameter calculations of 2AR agree surprisingly well with measured values. But we also list and briefly discuss cases where M1/M2 are not lattice matched, either having different crystal structures, or lattice parameters that differ by several percent. The published calculations of 2AR in these latter cases do not agree so well with measured values.Comment: 6 pages, 2 figures, 2 tables. In Press: Applied Surface Scienc

The Origin of Transverse Flow at the SPS

We study the transverse expansion in central Pb+Pb collisions at the CERN SPS. Strong collective motion of hadrons can be created. This flow is mainly due to meson baryon rescattering. It allows to study the angular distribution of intermediate mass meson baryon interactions.Comment: submitted to Phys. Lett.

Cyber Threat Intelligence Sharing in Nigeria

Cybersecurity challenges are common in Nigeria. Sharing cyber threat intelligence is essential in addressing the extensive challenges posed by cyber threats. It also helps in meeting regulatory compliance. There are a range of impediments that prevent cyber threat intelligence sharing. We hypothesise that we want to maximise this cyber threat intelligence sharing to resist malicious attackers. Therefore, this research investigates factors influencing threat intelligence sharing in Nigeria\u27s cyber security practitioners. To achieve this aim, we conducted research interviews with 14 cyber security practitioners using a semi-structured, open-ended interview guide, which was recorded and transcribed. We analysed the data using an approach informed by grounded theory. We coded the data, organised the data into categories, and used constant comparison to check our code\u27s consistency and accuracy. We developed memos from which our descriptive grounded theory emerged. After a detailed study, we found that cybersecurity practitioners in Nigeria are enthusiastic about collaborating to exchange and receive cyber threat intelligence. However, we discovered two impediments to sharing. Firstly, the existence of competing standardisation in cyber threat intelligence sharing and, secondly, the lack of practitioner\u27s skills in data protection. These barriers inhibit cyber security practitioners from disseminating such cyber threat intelligence sharing inside Nigeria. Based on our findings, we conclude that overcoming these impediments will help cybersecurity practitioners share more cyber threat intelligence in Nigeria

Exploring the complexities of understanding vulnerability and adult safeguarding within Christian Faith organisations

Purpose – The purpose of this paper is to report the findings from a study exploring the understanding of vulnerability and adult safeguarding within Christian faith based settings. The article concludes with recommendations for practitioners involved in safeguarding adults in faith based Christian settings. Design/methodology/approach – The paper considers a survey (n=3182) into understanding of vulnerability and adult safeguarding for individuals who attend Church regularly or work in a Christian organisation Findings - This paper is the first to be undertaken with a UK sample and highlights a range of factors informing adult safeguarding practice within Christian organisations. This includes:- complexity linked to understanding vulnerability and its role in safeguarding activity; lack of clarity about what to do with a safeguarding adult concern, and the need for safeguarding training pertinent to the particular needs of faith based settings. Research limitations/implications - As there is currently a dearth of research in this area this paper makes a valuable contribution to the developing knowledge base around safeguarding and vulnerability within faith based organisations. Practical implications - Professionals need to develop increased understanding of the complexities involved in safeguarding activity, and specifically how those working in the wider context of supporting vulnerable adults make sense of safeguarding processes and procedures. Social implications – It is important that all organisations, including faith based settings, working with adults have an understanding of their roles and responsibilities with respect to safeguarding those at risk of harm. Originality - This paper is the first UK study to consider safeguarding adults at risk of harm in Christian faith context

Generalized characteristic polynomials of graph bundles

In this paper, we find computational formulae for generalized characteristic polynomials of graph bundles. We show that the number of spanning trees in a graph is the partial derivative (at (0,1)) of the generalized characteristic polynomial of the graph. Since the reciprocal of the Bartholdi zeta function of a graph can be derived from the generalized characteristic polynomial of a graph, consequently, the Bartholdi zeta function of a graph bundle can be computed by using our computational formulae

Mid-rapidity π±\pi^\pm, K±K^\pm, and pˉ\bar{p} spectra and particle ratios from STAR

Results are presented on $\pi^\pm$, $K^\pm$, and $\bar{p}$ transverse mass spectra and particle multiplicity ratios at mid-rapidity in Au+Au collisions at $\sqrt{s_{_{\rm NN}}}$=130 and 200 GeV and in p+p collisions at $\sqrt{s}$=200 GeV. Comparisons are made to results from lower energies. The bulk properties of the collision inferred from these results are discussed.Comment: 4 pages, 3 figures, Talk presented at Quark Matter 2002, Nantes, France, July 200

Charge Particle Multiplicity and Transverse Energy Measurements in Au-Au collisions in PHENIX at RHIC

We present results on charged particle and transverse energy densities measured at mid-rapidity in Au-Au collisions at sqrt(s_{NN})=200 GeV. The mean transverse energy per charged particle is derived. The results are presented as a function of centrality, which is defined by the number of participating nucleons, and compared to results obtained in Au-Au collisions at sqrt{s_{NN})=130 GeV. A comparison with calculations from various theoretical models is performed.Comment: 4 pages, 5 figures. Talk presented at Quark Matter 2002, Nantes, France, July 18-24, 2002. To appear in the proceedings (Nucl. Phys. A