Ξ−\Xi^{-} and Ξˉ+\bar{\Xi}^{+} baryon production in Au+Au collisions at sNN=130\sqrt{s_{NN}}=130 GeV

We report preliminary results on the centrality dependence of the $\Xi^{-}$ and $\bar{\Xi}^{+}$ production at mid-rapidity in $\sqrt{s_{NN}}=130$ GeV Au+Au collisions from the STAR experiment. For the most central data the obtained yields suggest a saturation of strangeness production per produced hadron. The calculated inverse slope parameter may indicate an earlier freeze-out of these particles.Comment: 4 pages, 3 figures, 1 table, Contribution to Quark Matter 2002, Nantes, France, July 200

Multi-strange particle production in relativistic heavy ion collisions at sNN=62.4\sqrt{s_{NN}}=62.4 GeV

We present preliminary STAR results on measurements of multi-strange particles $\Xi$, $\Omega$ and their anti-particles from Au+Au and Cu+Cu at $\sqrt{s_{NN}}=62.4$ GeV collisions. In order to better understand the role of strangeness enhancement in nucleus-nucleus collisions and its scaling properties with system size, we compare the results from Au+Au and Cu+Cu reactions for different event centrality classes. Strangeness enhancement is discussed in the context of multi-strange to pion ratios. Finally, $\Omega/\phi$ ratio is shown for different systems and energies for a systematic study

Heavy-Ion Physics with ALICE

The ALICE detector, expected to start operating at the Large Hadron Collider this year, was designed specifically for the study of heavy-ion collisions. In this paper we recall the main features of the apparatus and give some examples of the expected physics performance

The "Jihadi Wolf" threat. The evolution of terror narratives between the (cyber-)social ecosystem and self-radicalization "ego-system"

The research conducted by the ECTC Advisory Group on Online Terrorist Propaganda between October 2016 and April 2017 was presented in the 1st ECTC Conference on Online Terrorist Propaganda (10-11 April 2017) and resulted in the following publication

Strangeness enhancement at midrapidity in Pb–Pb collisions at 158 A GeV/ c : A comparison with VENUS and RQMD models

Recently the WA97 Collaboration has measured $\mathrm{K}^0_{\mathrm{S}}$ , $\mathrm\Lambda$ , $\mathrm\Xi$ , $\mathrm\Omega$ and negative particle yields and transverse mass spectra at central rapidity in Pb–Pb and p–Pb collisions at 158 A GeV/c. These results are compared with the predictions of two of the most widely used event generators for heavy-ion collisions: VENUS 4.12 and RQMD 2.3. Both models predict that enhancements increase with the strangeness content of the particle. They fail, however, to reproduce completely the measured values of yields at central rapidity. In particular, for multistrange particles, VENUS fails to reproduce both the p–Pb and the Pb–Pb data, while RQMD works for p–Pb collisions but seems to be unable to reproduce the $\mathrm\Omega$ data in Pb–Pb collisions. Moreover, the predicted behavior for strangeness production as a function of the centrality of the collision appears to be different from the observed behavior

La Contabilità pratica prima di Luca Pacioli: Origine della Partita Doppia. (Accounting Practice before Luca Pacioli: Emergence of Double entry).

Se inicia el trabajo con una breve revisión de los principales factores que a comienzos del siglo XIII limitaban el desarrollo de los registros contables en Italia. Estos factores eran el desconocimiento de la numeración arábiga y del papel, así como la precaria situación socioeconómica de muchas regiones italianas. Pese a ello, existían sin embargo numerosos monasterios benedictinos en casi todas las regiones y empresas mercantiles en las ciudades marítimas, como Venecia, Génova, Pisa, etc., que de una forma u otra llevaban sus contabilidades. The paper begins with a brief review of the principal factors that limited the development of accounting records in Italy at the turn of the 13th century. These factors were the ignorance of Arabic numerals, the non-existence of paper and the precariousness of the socio-economic conditions in many Italian regions. Despite these, the numerous monasteries found in almost all regions and the merchant enterprises in the main coastal cities, like Venice, Genoa, Pisa, etc., all kept some kind of accounting records.Baja Edad Media,contabilidad, historia, Italia, Pacioli, práctica contable. Accounting, accounting practice, history, Italy, late Middle Ages, Pacioli.

Eelgrass Restoration in San Francisco Bay: An Interdisciplinary Stated Preference Classroom Experiment

This paper aims to integrate experiential, interdisciplinary approaches into environmental economics courses through a stated preference analysis for eelgrass beds harboring aquatic plants foundational to many estuaries and coastal zones. It argues that such approaches are necessary in undergraduate education to support real-world needs in oceans and climate policy. Through collaboration with ecologists and peers, students developed willingness-to-pay measures of $35 and$42 for a 10-year restoration program for 200 acres of eelgrass (Zostera marina) in the San Francisco Bay based on open- and closed-ended elicitation formats. The experiment provides an example of overcoming the challenge of orienting students and stated preference survey respondents to a complex marine environment and meets conventional economic learning objectives

Pure mycelium materials: characteristics and applications

Mycelium is the vegetative part of Fungi. It is made up of an interconnected network of hyphae, which are elongated cells with a complex cell wall. Fungi are able to grow on a wide range of substrates thanks to the extended catalytic capabilities of the enzymes they secrete and they have a modular nature, thus they grow by apical extension and lateral branching. They are exploited for a large variety of applications, from bioremediation to drug production. Recently, mycelial biocomposites obtained from the growth of a strain on waste agricultural substrates have been used as materials, which have great thermal and hydrodynamic properties, a low cost of processing and they are easily biodegraded. Previous works from Smart Materials group showed that even pure mycelia have promising features to be employed as materials and in nanotechnological applications. These conclusions are further investigated in the Thesis. The Introduction is an overview of the issues related to plastic use and production and contains a review of the main solutions and alternatives considered up to now. In the second part of the Introduction, mycelia and their applications are described. In Chapter 1, the possibility of finely tune morphological, chemical, hydrodynamic and mechanical properties of pure mycelial materials is investigated by analyzing growth of Ganoderma lucidum in liquid substrates enriched in different components. In Chapter 2, both the porous structure and the chemical and hydrodynamic features of mycelia from Ganoderma lucidum and Pleurotus ostreatus are exploited in the development of suitable bioscaffolds for attachment and growth of Human Adult Fibroblasts (HDFAs)

System and Energy Dependence of Strangeness Production with STAR

The yields and spectra of strange hadrons have each been measured by STAR as a function of centrality in $\rm \sqrt{s_{NN}}=$ 200 GeV AuAu collisions. By comparison to measurements in pp and dAu at $\rm \sqrt{s_{NN}}=200$ GeV and in AuAu at $\rm \sqrt{s_{NN}}=62$ GeV the dependence on system size and energy is studied. Short-lived resonances, such as $\Sigma (1385)$ and $\Lambda (1520)$, that may decay and regenerate in the medium, are used to examine the dynamical evolution between production and freeze-out for these systems. Particle production is investigated by comparison to thermal models, which assume a simple scaling of the yield with $\rm N_{part}$, in order to calculate the strangeness enhancement. Our hyperon measurements in AuAu indicate that $\rm N_{bin}$ may be a more appropriate scale for the strangeness correlation volume. In this case canonical suppression can not be simply parameterized with the geometrical overlap volume but will depend on the individual quark content of each particle. This theory is tested by comparing the data from different collision systems and centralities.Comment: Quark Matter 2005 Talk. Talk ppt file with further supporting plots can be found in http://qm2005.kfki.hu/talk2_select.pshtml?sel=10