Search results for "SB"
showing 10 items of 1841 documents
Surface versus bulk composition of a phosphate glass
1994
Transmission and conversion electron Mossbauer spectroscopy as well as photoelectron spectroscopy were applied to study alterations of the surface layer of an iron containing industrial phosphate glass as compared with its bulk. In the surface layer, after polishing and exposure to ambient atmosphere, Fe 2+ is partially oxidized to Fe 3+ . This oxidation, however, does not increase the O/P ratio in this layer, because it goes along with a strong leaching of network modifiers. This leaching leads to a net decrease of the O/P ratio because it overcompensates the relative oxygen increase by Fe 2+ oxidation and by uptake of water
Heat-induced charge transfer in cobalt iron cyanide
2006
The heating of Co(2+) ferricyanide above 801C induces an inner charge transfer from Co(2+) towards Fe(III) to form the mixed valence system Co(2+)Co(III) ferri- ferro-cyanide. This charge transfer takes place preserving the material framework and forming a solid solution of the initial and final species. The cell edge of the cubic cell (Fm-3m) of this solid solution follows a regular variation with
Relationship between XPS core binding energies and atomic charge in adducts of SnIV derivatives with pyrazine, and comparison with mössbauer isomer s…
1981
Abstract Adducts Snhal·pyz (hal = Cl, Br, I; pyz = pyrazine), RnSnCl 4−n ·pyz (n = 1, R = Me, Bu n , Oct n , Ph; n = 2, R = Ph) and SnCl 4 ·(pyz) 2 have been investigated by X-ray photoelectron spectroscopy. Binding energy (b.e.) values are discussed in the light of structural characteristics of the adducts as well as of valence state electronegativities of atoms and groups bound to tin. Sn 3d 5 2 b.e.s, corrected for the Madelung potential at the metal atom, linearly correlate with both partial atomic charges on tin, accounting for relaxation upon ionization, and 119 Sn Mossbauer isomer shifts. The results are interpreted in terms of six-coordinated, octahedral type, configurations of the …
Biferrocene Amino Acid, a Ferrocenylogoue of Ferrocene Amino Acid: Synthesis, Cross-Linking, and Redox Chemistry
2010
Access of the novel biferrocene amino acid 7 is provided by two different routes, namely, via desymmetrization of a biferrocene and via palladium-catalyzed cross-coupling of two substituted ferrocenes. The dissymmetric biferrocene 7 is head−head coupled to ureylene-bridged bis(biferrocene) 9 and also head−tail coupled to amide-bridged bis(biferrocene) 14. The monomer 7 and the dimers 9 and 14 are oxidized to mixed-valent cations 7+, 9+, 92+, and 142+. The valencies are trapped in the solid state as shown by Mossbauer and EPR spectroscopy and by X-ray diffraction analysis of [7](I3). Paramagnetic NMR shift studies (7 → 7+) suggest that the hole is localized at the N-substituted ferrocene uni…
From corona virus to corona crisis : the value of an analytical and geographical understanding of crisis
2020
Abstract The term ‘crisis’ is omnipresent. The current corona virus pandemic is perceived as the most recent example. However, the notion of crisis is increasingly deployed as a signifier of relevance, rather than as an analytical concept. Moreover, human geography has so far little contributed to the interdisciplinary crisis research field which is fixated on the temporal aspects of crisis but neglects its spatiality. Against this background, the first aim of the paper is to demonstrate the value of thinking about crisis analytically. Therefore, we introduce theoretical knowledge developed within a recently emerging literature on crisis management. Second, we demonstrate the relevance of i…
Il Codex DCCCIX (DCCCXIII) della Biblioteca Capitolare di Verona: «prima trascrizione delle Istituzioni di Gaio» o «copia del tutto inservibile»?
2016
Partendo da una considerazione critica della tesi avanzata da Briguglio nel libro intitolato "La prima trascrizione delle Istituzioni di Gaio. Il Codex DCCCIX (DCCCXIII) Gaii Institutionum Libri della Biblioteca Capitolare di Verona" (2013), si contesta l'idea che la trascrizione parziale delle Istituzioni di Gaio ancor oggi custodita nella Biblioteca Capitolare di Verona (Codex DCCCIX) sia la prima versione in bella copia dei lavori di trascrizione del palinsesto gaiano (Verona, Biblioteca Capitolare, Codex XVI. Un esame più completo del Codex DCCCIX confrontato con le trascrizioni complete conservate nella Staatsbibliothek zu Berlin (Ms. lat. Fol. 308), infatti, dimostra che tale tesi non…
Le prime trascrizioni del palinsesto di Gaio e il presunto «mistero» delle schede veronesi (BCapVr, Cod. DCCCIX)
2014
This paper addresses the question of the origin of the partial transcription of Gaius’ palimpsest still preserved in the Capitular Library of Verona (BCapVr, Cod. DCCCIX) and allows to solve the pretended «mystery» about its presence in this library. A comparison with the fair copy (Reinschrift) of the transcription belonging to the Berlin State Library – Prussian Cultural Heritage (SBB-PK, Ms. lat. fol. 308, K. 1, Konv. 1) shows that the Cod. DCCCIX of the Capitular Library can not be regarded as a forgotten copy or a gift. Similarly, the idea that the manuscript was the first fair copy of the transcription works is not plausible. Anyway, a neglected information provided by one of the Prus…
Decontamination of a barrier facility using microisolator cages and provisional partitioning
2007
In 2000, the authors found endemic infections of mouse hepatitis virus, minute virus of mice, Syphacia obvelata, and Myobia musculi among mice in a large barrier facility at the University of Mainz. To eliminate the infections, they subdivided the facility into two distinct hygiene units. However, architectural constraints made it impossible to completely separate the HVAC systems of both hygiene units and to establish adequate personnel locks. To compensate for these suboptimal barrier conditions of the two newly established units, the authors replaced the open-top caging and open-servicing system with filter-top cages that were manipulated in cage-changing stations. The authors then depop…
La Sicilia nella monarchia di Filippo IV. Politica e società
2018
Politics and society in the Catholic monarchy of Philip IV: Kingdom of Sicily
Nitrogen Distribution in Annual Growth of ‘Italia’ Table Grape Vines
2018
Little information is available about either nitrogen (N) content/concentration in table grape vines. The knowledge about N accumulated by the vine organs during the season could support sustainable fertilization programs for table grape vineyards. The aim of the present paper was to investigate the N content in different annual organs, in summer and winter pruning materials, clusters at harvest and fallen leaves at post-harvest of table grape vines in order to verify the vine annual N requirements to be used for sustainable N fertilization schedules. Biomass and nitrogen were analyzed at six phenological growth stages (flowering, berry-set, berry growth, veraison, ripening, and harvest) fr…