Search results for "DUB"

Revisiting Dubai's Business School Mania

2019

We continue the ongoing dialogue in AMLE on business school hubs and addresses from Rogmans (2019, this issue) by evaluating the applicability of Dunning’s OLI advantages—Ownership (O), Location (L), Internalization (I)—in explaining Dubai’s emergence as a global education hub. Because business schools typically possess few transferable Ownership-advantages, Dunning’s OLI advantages theory appears simplistic and decontextualized when applied to the global business school field. This commentary contributes to existing research on business school hubs by providing some guiding points for future discussions seeking to develop a better understanding of international branch campuses. peerReviewed

Inquietudine del dubbio e luce del bene. Le risorse argomentative della misericordia

2016

Contenuti e learning outcomes: una proposta per gli insegnamenti del Corso di Specializzazione sul sostegno

2020

Il lavoro nell’ottica del monitoraggio e del miglioramento ai fini della progettazione delle attività future del Corso di Specializzazione per le Attività di Sostegno (D.M. 30 settembre 2011), si colloca in seno all’attuale dibattito sulla ricerca di indicatori specifici e di strumenti condivisi per valutare e migliorare i risultati della didattica universitaria in questo ambito. L’individuazione dei contenuti core nei Corsi di Specializzazione rappresenta un elemento chiave per la progettazione e la formazione dei futuri docenti di sostegno. L’articolo presenta l’impostazione metodologica di un processo di ricerca messo in atto presso l’Università degli Studi di Palermo nell’a.a. 2018/19, …

Chemical properties of rutherfordium (Rf) and dubnium (Db) in the aqueous phase

2016

Recent experimental studies of the chemical characterization of the first two transactinide elements, rutherfordium (Rf) and dubnium (Db), conducted atom-at-a-time in aqueous phases are reviewed. A short description on experimental techniques based on partition methods, specifically automated rapid chemical separation systems, is also given. Perspectives for aqueous-phase chemistry experiments on heavier elements are briefly discussed.

Fluoride Complexation of Element 104, Rutherfordium

2004

Fluoride complexation of element 104, rutherfordium (Rf), produced in the 248Cm(18O,5n)261Rf reaction has been studied by anion-exchange chromatography on an atom-at-a-time scale. The anion-exchange chromatographic behavior of Rf was investigated in 1.9-13.9 M hydrofluoric acid together with those of the group-4 elements Zr and Hf produced in the 18O-induced reactions on Ge and Gd targets, respectively. It was found that the adsorption behavior of Rf on anion-exchange resin is quite different from those of Zr and Hf, suggesting the influence of relativistic effects on the fluoride complexation of Rf.

Hexafluoro complex of rutherfordium in mixed HF/HNO3 solutions

2008

Formation of anionic fluoride-complexes of element 104, rutherfordium, produced in the 248 Cm( 18 O, 5n) 261 Rf reaction was studied by anion-exchange on an atom-at-a-time scale. It was found that the hexafluoro complex of Rf, [RfF 6 ] 2- , was formed in the studied fluoride ion concentrations of 0.0005-0.013 M. Formation of [RfF 6 ] 2- was significantly different from that of the homologues Zr and Hf, [ZrF 6 ] 2- and [HfF 6 ] 2- ; the evaluated formation constant of [RfF 6 ] 2- is at least one-order of magnitude smaller than those of [ZrF 6 ] 2- and [HfF 6 ] 2- .

Liquid-Phase Chemistry of Superheavy Elements

2013

An overview over the chemical separation and characterization experiments of the four transactinide elements so far studied in liquid phases, rutherfordium (Rf), dubnium (Db), seaborgium (Sg), and hassium (Hs), is presented. Results are discussed in view of the position of these elements in the Periodic Table and of their relation to theoretical predictions. Short introductions on experimental techniques in liquid-phase chemistry, specifically automated rapid chemical separation systems, are also given. Studies of nuclear properties of transactinide nuclei by chemical isolation will be mentioned. Some perspectives for further liquid-phase chemistry on heavier elements are briefly discussed.

Adsorption of Db and its homologues Nb and Ta, and the pseudo-homologue Pa on anion-exchange resin in HF solution

2009

Anion-exchange chromatography of element 105, dubnim (Db), produced in the 206 Cm( 19 F, 5n) 262 Db reaction is investigated together with the homologues Nb and Ta, and the pseudo-homologue Pa in 13.9 M hydrofluoric acid (HF) solution. The distribution coefficient (K d ) of Db on an anion-exchange resin is successfully determined by running cycles of 1702 chromatographic column separations. The result clearly indicates that the adsorption of Db on the resin is significantly different from that of the homologues and that the adsorption of anionic fluoro complexes of these elements decreases in the sequence of Ta ≈ Nb > Db > Pa.

Chemical studies on rutherfordium (Rf) at JAERI

2005

SummaryChemical studies on element 104, rutherfordium (Rf), at JAERI (Japan Atomic Energy Research Institute) are reviewed. The transactinide nuclide261Rf has been produced in the reaction248Cm(18O, 5n) at the JAERI tandem accelerator with the production cross section of about 13 nb. On-line anion-exchange experiments on Rf together with the lighter homologues, group-4 elements Zr and Hf, in acidic solutions have been conducted with a rapid ion-exchange separation apparatus. From the systematic study of the anion-exchange behavior of Rf, it has been found that the properties of Rf in HCl and HNO3solutions are quite similar to those of Zr and Hf, definitely confirming that Rf is a member of …

Anionic Fluoro Complex of Element 105, Db

2009

We report on the characteristic anion-exchange behavior of the superheavy element dubnium (Db) with atomic number Z=105 in HF/HNO3 solution at the fluoride ion concentration [F−]=0.003 M. The resul...