The San Leone (Agrigento) dunes: geomorphological environment and managment

Deep sea tests of a prototype of the KM3NeT digital optical module

SIRE(opens in a new window)|View at Publisher| Export | Download | Add to List | More... European Physical Journal C Volume 74, Issue 9, 1 September 2014, 8p Deep sea tests of a prototype of the KM3NeT digital optical module: KM3NeT Collaboration (Article) Adrián-Martínez, S.a, Ageron, M.b, Aharonian, F.c, Aiello, S.d, Albert, A.e, Ameli, F.f, Anassontzis, E.G.g, Anghinolfi, M.h, Anton, G.i, Anvar, S.j, Ardid, M.a, de Asmundis, R.k, Balasi, K.l, Band, H.m, Barbarino, G.kn, Barbarito, E.o, Barbato, F.kn, Baret, B.p, Baron, S.p, Belias, A.lq, Berbee, E.m, van den Berg, A.M.r, Berkien, A.m, Bertin, V.b, Beurthey, S.b, van Beveren, V.m, Beverini, N.st, Biagi, S.uv, Bianucci, S.t, Billault, M.b,…

Blue-violet heterojunction LEDs based on hydrothermally synthesized ZnO nanorods

Zinc oxide nanorods have great potential for the realization of high efficiency heterostructure LEDs based on p-doped GaN. Well-aligned vertical nanorods are desirable to enhance the LED outcoupling performances due to a better confinement of the light [1]. However, due to the lack of reproducible p-type ZnO, a p-GaN substrate is still needed. This work reports on the fabrication of n-ZnO/p-GaN heterojunction LEDs based on vertical ZnO nanorods grown by hydrothermal method. The chemical reaction in the hydrothermal growth of ZnO is based on the decomposition of zinc nitrate, (Zn(NO3)2) with resulting Zn2+ ions reacting with the hydroxyl ions obtained by the thermal degradation of hexamethyl…

Scienza e Arti Perdute: i Segreti degli Antichi Maestri Liutai

Lo scopo di questo lavoro è illustrare agli insegnanti la connessione tra due settori di attività apparentemente lontani: la scelta dei materiali utilizzati nella liuteria artigianale e la chimica. Il ruolo, la composizione e la classificazione delle principali vernici per liuteria sono qui descritte assieme ad una breve sintesi dello stato dell’arte. Nel lavoro, vengono presentati i principali concetti di una tecnica analitica non distruttiva abbastanza semplice (la spettroscopia di fluorescenza da raggi X) ma, probabilmente, non abbastanza nota ai non addetti ai lavori. Un caso di studio a essa correlato è inoltre presentato per evidenziare uno dei possibili contributi del chimico nello s…

ART AND TECHNIQUE: ARTISTIC REPRODUCTION OF THE ANCIENT BRONZE IL GUERRIERO DA PETRALIA SOTTANA

The reproduction of artistic objects is useful for museological, teaching, and commercial purposes. In some cases, the reproduction is carried out to replace the originals located in outdoor environments and to prevent the deterioration due to weathering or pollution. This article describes the different phases that led to the reproduction of the Il Guerriero da Petralia Sottana. The observation of stylistic characteristics and the physical-chemical investigation were carried out in order to obtain information about the composition of the alloy and the technological properties of the artifact by using Optical Microscopy and X- ray Fluorescence. The reproduction in wax was performed by using…

Fabrication and characterization of micrometer-scale ZnO memristors

Memristors are an interesting class of resistive random access memory (RRAM) based on the electrical switching of metal oxide film resistivity . They are characterized for exhibiting resistive switching between a high-resistance state (HRS) and a low-resistance state (LRS) and have been recently considered as one of the most promising candidates for next-generation nonvolatile memory devices because of their low power consumption, fast switching operation, nondestructive readout, and remarkable scalability. The device structure is simply an oxide layer sandwiched between two metal electrodes. The switching behaviour is dependent both on the oxide material and the choice of metal electrodes.…

Influence of electrodes layout on hydrothermally-grown GaN/ZnO LEDs

Light-emitting diodes (LEDs) based on zinc oxide, with wide direct band gap, have drawn much attention in the last years. ZnO, which is natural n-type, has excellent physical and chemical properties, is inexpensive, abundant and nontoxic. Unfortunately, the preparation of reproducible and high quality p-type ZnO film is comparatively difficult, due to the low solubility of acceptor dopants, self-compensating effects, and acceptor level energy height. Although many groups have reported on ZnO-based homostructure LEDs, the results are controversial as recently reviewed in [1]. Hence, heterojunction LEDs based on ZnO as the nside and GaN as the p-side of the junction have been put forward [2].…

The San Leone (Agrigento) dunes: coastal geomorphology

Deep sea tests of a prototype of the KM3NeT digital optical module: KM3NeT Collaboration

The first prototype of a photo-detection unit of the future KM3NeT neutrino telescope has been deployed in the deep waters of the Mediterranean Sea. This digital optical module has a novel design with a very large photocathode area segmented by the use of 31 three inch photomultiplier tubes. It has been integrated in the ANTARES detector for in-situ testing and validation. This paper reports on the first months of data taking and rate measurements. The analysis results highlight the capabilities of the new module design in terms of background suppression and signal recognition. The directionality of the optical module enables the recognition of multiple Cherenkov photons from the same $^{40…

Studio morfometrico e statistico degli eventi di frana nel settore marino orientale del Golfo di Taranto

La campagna oceanografica “Teatioca” è il frutto della collaborazione fra l’Istituto per l’Ambiente Marino Costiero (IAMC) di Napoli, l’Università Federico II di Napoli, l’Università di Palermo e Trieste e l’INGV di Roma. Durante tale campagna, effettuata a bordo della N/O Urania del CNR nel 2011, sono stati acquisiti dati batimetrici multibeam ad alta risoluzione ed una fitta maglia di dati sismici ad alta (Sparker) ed altissima (Chirp) risoluzione nell’area ionica del Golfo di Taranto. L’analisi integrata del Modello Digitale del Terreno (10m, 5m e 2m) generato dai dati multibeam con i nuovi dati sismo-stratigrafici ha consentito di analizzare in dettaglio l’instabilità dei versanti. Una …

Solid state NMR applications in the field of cultural heritage

The Acqualadrone Rostrum: a physical-chemical investigation to understand the Material History

The aim of this work is to define the conservation state and to ascertain the provenance of raw materials used in the construction of the Acqualadrone Rostrum. In 2008 the rostrum (an offensive naval weapon mounted on the prow at the waterline), from an ancient warship was recovered from the Mediterranean near Acqualadrone, Messina, Sicily. The archaeological discovery has led to the need for scientific research in order to plan the conservation treatment of this artefact. The discovery is exceptional because of the presence of a wooden section from the original ship. The physical-chemical investigation, by using some complementary spectroscopic techniques, was focused on the characterizati…

Pulsed laser deposition of ZnO and VO2 films for memristor fabrication

Memristors are resistive switching memory devices which have attracted much attention over the last years for high-density memory applications because of their simple structure, small cell size, high speed, low power consumption, potential for 3-D stacking and excellent compatibility with the complementary metal-oxide-semiconductor (CMOS) technology [1]. Beside nonvolatile memory applications, memristors have been also proposed for other different applications including biosensors [2] and neuromorphic [3] circuits. The device structure is simply an oxide material sandwiched between two metal electrodes. The switching behavior is not only dependent on the oxide material but also on the choic…

CCDC 747264: Experimental Crystal Structure Determination

Related Article: F.Caruso, M.V.Raimondi, G.Daidone, C.Pettinari, M.Rossi|2009|Acta Crystallogr.,Sect.E:Struct.Rep.Online|65|o2173|doi:10.1107/S1600536809032188

CCDC 233991: Experimental Crystal Structure Determination

Related Article: C.Pettinari, F.Marchetti, R.Pettinari, A.Cingolani, E.Rivarola, C.Phillips, J.Tanski, M.Rossi, F.Caruso|2004|Eur.J.Inorg.Chem.||3484|doi:10.1002/ejic.200400225

CCDC 233990: Experimental Crystal Structure Determination

Related Article: C.Pettinari, F.Marchetti, R.Pettinari, A.Cingolani, E.Rivarola, C.Phillips, J.Tanski, M.Rossi, F.Caruso|2004|Eur.J.Inorg.Chem.||3484|doi:10.1002/ejic.200400225

CCDC 233992: Experimental Crystal Structure Determination

Related Article: C.Pettinari, F.Marchetti, R.Pettinari, A.Cingolani, E.Rivarola, C.Phillips, J.Tanski, M.Rossi, F.Caruso|2004|Eur.J.Inorg.Chem.||3484|doi:10.1002/ejic.200400225