2,034 research outputs found
Oltre la 'razza': race e ethnicity negli studi postcoloniali
No full textIn Oltre la “razza”: race and ethnicity negli studi postcolonia- li, Shaul Bassi sottolinea come “razza” ed “etnicità”, ritenute proprietà intrinseche di individui e collettività, siano in realtà categorie politiche che mutano nella storia e che definiscono fenomeni diversi in culture diverse. Attraverso esempi tratti dalla letteratura coloniale e postcoloniale, il saggio cerca di di- mostrare come da un lato ci sia bisogno di un lessico che ci aiuti a concettualizzare la differenza umana, ma dall’altro come le categorie vigenti siano invischiate e compromesse dalla loro storia coloniale
Electrochemical Properties of Transparent Conducting Films of Tantalum-Doped Titanium Dioxide
No full textHighly conducting, optically transparent Ta-doped TiO2 (anatase) thin films are grown on ordinary soda-lime glass substrate by pulsed-laser deposition. They exhibit quasi-reversible cyclic voltammograms of Fe(CN)63-/4- and dimethylviologen redox couples, mimicking the electrochemical activity of F-doped SnO2 (FTO). Hence, our Ta-doped titania films can prospectively replace FTO, e.g. in dye-sensitized and perovskite solar cells. However, these films are idle for the Ru(bpy)32+ oxidation, which is attributed to the space-charge barrier. The flatband potentials are near the values for undoped reference films and/or for the pristine anatase single-crystal electrode. Our films show photoelectrochemical activity upon irradiation with UV light at potentials positive to flatband. The photocurrents decrease proportionally to the increase of Ta-content. The Li-insertion ability analogously decreases with the increasing Ta-content which is attributed to the positive charge of Ta5+ cations which occupy the Ti4+ sites in anatase lattice. Consistent with the quasi-metallic nature of our films, the Li-extraction peak in cyclic voltammograms shows no cut at larger potentials
Intercalation of graphite in Li-ion batteries: In situ microscopic characterization of the solid-electrolyte interface (SEI)
No full textEnergy storage technologies are crucial in the next green-energy transition. In particular, Li-ion batteries (LIBs) are nowadays
the reference technology for many applications including, in particular, the forthcoming electrical mobility. In the last years,
the deep investigation of the plethora of complex phenomena controlling the charge storage mechanism in LIBs allowed
a considerable improvement in LIBs performance. In this regard, in situ analysis played a fundamental role in the
comprehension of the degradation processes occurring at the electrode/electrolyte interface. In particular, in situ electro chemical atomic force microscopy (EC-AFM), consisting in high-resolution microscopy under electrochemical control,
uniquely allowed to monitor the evolution in morphology and mechanical properties of the solid-electrolyte interface (SEI)
forming at low potential on the graphitic anodic electrodes of LIBs. In this work, we employed in situ EC-AFM measurements
and ex situ ToF-SIMS analysis as representative techniques to provide a comprehensive morphological and compositional
overview of the SEI film formed under cyclic voltammetry experiments. The work aims to provide guidelines in the SEI
evolution when highly oriented pyrolytic graphite (HOPG), which can be considered a model electrode, is employed. The
reported in situ data are in agreement with current interpretative models. The ex situ ToF-SIMS analysis discloses a film
composition where different Li compounds are uniformly distributed on the electrode surfac
La fine di un’era? Suggestioni apocalittiche al tempo del Covid-19
No full textIn this chapter, the author explores, with introspective approach, the collective experience during the Covid-19 pandemic. The chapter seeks to provide an explanation for the paradox wherein, during the initial phase of the pandemic, citizens passively accepted the restrictions imposed by the government, which due to the lack of scientific evidence were generic and largely irrational, while in the second period, characterised by the availability of the vaccine, forms of rebellion were witnessed. The author explains the first situation by resorting to an analysis of symbolism and discursive figures used in public communication. For the second, he introduces insights from the conception of time and history of the Oromo people of Ethiopia, capable of elucidating the political paradigm shift experienced by the European Union during the pandemic period. The author then employs suggestions from the anthropological theory of incorporation to explain the public's reactions in terms of resistance
Synthesis, structure and functional properties of quasi-1D TiO2 nanoarchitectures for water splitting
No full textDevelopment of nanostructured TiO2 photoanodes for hydrogen production by water splitting
No full textCrambus varii Bassi & I- & To 2012, n.sp.
No full textCrambus varii n.sp. Figs 10, 24, 26 HOLOTYPE: TMSA, without registration number; ♀; [RSA, Western Cape, 33°57’S, 22°32’E] Saasveld George, C [ape] P[rovince], South Africa, H. Geertsema; 26.8.1964; Holotype Crambus varii n. sp. G. Bassi det. 1995, TMSA, (not dissected). PARATYPES (all from RSA): TMSA, without registration number; 1♀; same data as holotype. - TMSA, without registration number; 1♀; idem, 2.2.[19]65 - TMSA, without registration number; 1♀; idem, 1-10.II.1965. - TMSA, without registration number; 1♀; idem, 5.I.1965. - TMSA, without registration number; 13; idem, 26.XII.1964. - TMSA, without registration number; 13; idem, 1.1.1965. - TMSA, without registration number; 1♀; idem, 16.9.1964, De Fin. - TMSA, without registration number; 13; Kogelberg C [ape] P[rovince], Nature Reserve; 6-13.III.1983; Kroon & Molekane, GS 3330 GB. - TMSA, without registration number; 13; Cape Prov[ince], Kogelberg (34 18 BD), 23 Mar[ch] 1981, D.M. Kroon, GS 4193 GB. - TMSA, without registration number; 13; Stellenbosch; 3.3.’[19]21; Ch. K. Brain. - TMSA, without registration number; 13; 1♀, Vyeboom, Caledon Distr[ict]; 10.II.1954; L. Vári, GS 3300 GB. - TMSA, without registration number; 1♀; Saasveld; 5.I.[19]65. - MFNB, without registration number; 2♀♀; RSA, Bontebok NP, Swellendam; 14. 16.XI.1993; leg. Mey & Ebert. - CB, without registration number; 13; Saasveld, C.P.; 23.XII.1964; H. Geertsema, GS 5235 GB. - CB, without registration number; 1♀; Algeria Forestry, Clanwilliam Distr.; 4-10.III.1969; Potgieter & Strydom, GS 5240 GB. - MHNG, without registration number; 1♀, Worcester, Amandel spruit; 18.X.1966; Vári & Potgieter. – TMSA and CB (13), without registration number; 233; 2♀♀, Tsitsikam[m]a Goesabos Forestry; 13-22.III.1979; Potgieter & Scoble. - TMSA, without registration number; 1♀; Cape Prov[ince], Tsitsikam[m]a forest, Goesabos, 33 23 DD; 13-22 Mar 1979; J. Potgieter & M. Scoble, GS 3850 GB. - TMSA, without registration number; 1♀; Tsitsikam [m]a, Ou-brug; 17.III.1979; Potgieter & Scoble. ETYMOLOGY: The species is dedicated to Lajos Vári of the TMSA, author of very valuable entomological collections in Southern Africa. DIAGNOSIS: The combination of forewings without separated submarginal area, male genitalia with fully developed uncus, phallus with dorsoapical tooth and strong cornuti, and female genitalia with very large and strongly sclerotized ostium characterize this species among African Crambus. DESCRIPTION (Fig. 10): Wingspan: male 20-21 mm, female 25-27 mm. Labial palpi 4 X longer than widest diameter of eye, with inner side white and outer side brown with upper margin and tip white. Maxillary palpi white with brown basis. Frons clearly produced, rounded, white. Antennae brown, with silvery costa, serrate in male, simple in female. Ocelli and chaetosemata moderately developed. Head white, with few chestnut brown scales in middle. Patagium laterally brown, white medially. Tegulae dark brown. Thorax white. Abdomen bronze brown to whitish, suffused brown. Forewings ground color bronze brown, lighter in dorsal area; costal area white, wide, and white suffused with chestnut brown toward apex; female with more pointed apex; medial stripe wide, white, reaching outer margin; veins marked by white scales toward outer margin; outer margin with seven subterminal dots, more developed in female; fringes with both short and long scales white with silvery bronzed tip, thus appearing white with medial and terminal lines silvery bronzed. Hindwings white with brown suffusion; fringes white. Fore and midlegs bronze brown; hindlegs whitish, suffused bronze brown. MALE GENITALIA (Fig. 26): Uncus long, sinuous, pointed, moderately bent downward and sclerotized. Two large and spatulate socii cover up to two thirds of length of uncus. Gnathos one third longer than uncus, with apex rounded and bent downward. Tegumen with large base, partially fused with vinculum. Vinculum stout, with large subtriangular dorsal extension. Pseudosaccus small. Valva wide, with membranous cucullus, with well developed and pointed costal and saccular processes and small medial process lamellar. Phallus slightly shorter than whole apparatus, with large subapical tooth; vesica with 5 subtriangular cornuti. FEMALE GENITALIA (Fig. 24): Papillae anales divided into two lobes and apophyses posteriores of medium size. Apophyses anteriores absent. Abdominal segment VIII with narrow tergite and strong and complex sternite. Ostium bursae very large and sclerotized. Ductus bursae longer than corpus bursae, sinuous, sclerotized in proximal two thirds, then fibrous. Ostium and ductus bursae spiculate. Ductus seminalis opening in distal third of ductus bursae. Corpus bursae with two well developed signa. DISTRIBUTION: RSA, Western Cape and Eastern Cape at Tsitsikamma. REMARKS: The presence of socii and both costal and saccular processes relates this species to C. pascuella; female genitalia are also reminiscent of some other Crambus, such as heringiellus Herrich-Schäffer.Published as part of Bassi, Graziano, 2012, New Afrotropical species of the genus Crambus Fabricius, 1798 (Lepidoptera: Pyralidae, Crambinae), pp. 269-286 in Revue suisse de Zoologie 119 (3) on pages 284-286, DOI: 10.5962/bhl.part.150195, http://zenodo.org/record/611826
Membrane fatty acids and erythrocyte Li-Na countertransport in nephrotic syndrome and their relationship
No full textCholesterol/phospholipids molar ratio and fatty acid composition have been estimated in erythrocyte membrane of 12 patients suffering from nephrotic syndrome and compared to values obtained in 23 normal subjects matched for sex and age. The membrane lipid composition has been correlated with the activity of erythrocyte Li-Na countertransport of the same subjects. The results show a significant increase in cholesterol/phospholipids ratio and total saturated fatty acids when erythrocytes of nephrotic patients are compared to normal erythrocytes, whereas total unsaturated fatty acids were lower in nephrotics (p less than 0.002). Li-Na countertransport was higher in nephrotics (p less than 0.001) and it was positively correlated with the total amount of saturated fatty acids of the erythrocyte membrane (r = +0.451; p less than 0.01). On the contrary, Li-Na countertransport was negatively correlated with the total amount of unsaturated fatty acids (r = -0.468; p less than 0.01)
Oropharyngeal decontamination with antiseptics to prevent ventilator-associated pneumonia : rethinking the benefits of povidone-iodine
No full textInterface-Driven Assembly of Pentacene/MoS2 Lateral Heterostructures
No full textMixed-dimensional van der Waals heterostructures formed by molecular assemblies and 2D materials provide a novel platform for fundamental nanoscience and future nanoelectronics applications. Here we investigate a prototypical hybrid heterostructure between pentacene molecules and 2D MoS2 nanocrystals, deposited on Au(111) by combining pulsed laser deposition and organic molecular beam epitaxy. The obtained structures were
investigated in situ by scanning tunneling microscopy and spectroscopy and analyzed theoretically by density functional theory calculations. Our results show the formation of atomically thin pentacene/MoS2 lateral heterostructures on the Au substrate. The most stable pentacene adsorption site corresponds to MoS2 terminations, where the molecules self-assemble parallel to the direction of MoS2 edges. The density of states changes sharply across the pentacene/MoS2 interface, indicating a weak interfacial coupling, which leaves the electronic signature of MoS2 edge states unaltered. This work unveils the self-organization of abrupt mixed-dimensional lateral heterostructures, opening to hybrid devices based on organic/inorganic one-dimensional junctions
- …
