491 research outputs found
A Technology Aware Magnetic QCA NCL-HDL Architecture
No full textMagnetic Quantum Dot Cellular Automata (MQCA) have been recently proposed as an attractive implementation of QCA as a possible CMOS technology substitute. Marking a difference with respect to previous contributions, in this work we show that it is possible to develop and describe complex MQCA computational blocks strongly linking technology and having in mind a feasible realization. Thus, we propose a practicable clock structure for MQCA baptised "snake-clock", we stick to this while developing a system level Hardware Description Language (HDL) based description of an architectural block, and we suggest a delay insensitive Null Convention Logic (NCL) implementation for the magnetic case so that the "layout=timing" problem can be solved. Furthermore we include in our model aspects critically related to technology and real production, that is timing, power and layout, and we present the preliminary steps of our experiments, the results of which will be included in the architecture descriptio
Silver nanoparticle ink technology: state of the art
No full textKrishna Rajan, Ignazio Roppolo, Annalisa Chiappone, Sergio Bocchini, Denis Perrone, Alessandro Chiolerio Center for Space Human Robotics, Italian Institute of Technology, Turin, Italy Abstract: Printed electronics will bring to the consumer level great breakthroughs and unique products in the near future, shifting the usual paradigm of electronic devices and circuit boards from hard boxes and rigid sheets into flexible thin layers and bringing disposable electronics, smart tags, and so on. The most promising tool to achieve the target depends upon the availability of nanotechnology-based functional inks. A certain delay in the innovation-transfer process to the market is now being observed. Nevertheless, the most widely diffused product, settled technology, and the highest sales volumes are related to the silver nanoparticle-based ink market, representing the best example of commercial nanotechnology today. This is a compact review on synthesis routes, main properties, and practical applications. Keywords: silver nanoparticles, surface plasmon resonance, nanocomposites, inks, printed electronic
PROPULSION APPARATUS FOR SPACE VEHICLES AND CORRESPONDING METHOD
No full textPropulsion apparatus (10) for space vehicles, comprising a solid state oxygen-rich source layer (11), means (12) for extracting oxygen from said solid state oxygen-rich source layer (11), means (16, 14, 17) for accelerating correspondingly extracted oxygen ions into vacuum. According to the invention, it comprises a stack including said solid state oxygen-rich source layer (11), an active layer (16) being deposited above said solid state oxygen-rich source layer (11), in contact with said solid state oxygen-rich source layer, said active layer (16) being formed with a material different from said solid state oxygen-rich source layer (11), said material being an oxide presenting impedance hysteresis behavior, i.e. a memristor, wherein in a low resistance state oxygen ions (22) are expelled through the active layer (16) and wherein in a high resistance state the active layer (16) ceases expelling oxygen ions (22)
APPARATO DI PROPULSIONE PER VEICOLI SPAZIALI E PROCEDIMENTO CORRISPONDENTE
No full textLa presente descrizione è relativa a tecniche per la propulsione di veicoli nel vuoto, in particolare nello spazio, mediante un apparato di propulsione per veicoli spaziali, comprendente uno strato di sorgente di ossigeno, mezzi per estrarre ossigeno da detto strato di sorgente di ossigeno, mezzi per accelerare in modo corrispondente gli ioni ossigeno estratti nel vuoto
Polymeric matrix nanocomposites containing magnetic nanoparticles: from science to applications
No full textMagnetic and magnetotransport properties of a Co-Sn evaporated trilayer
No full textThe aim of this work is the magnetic characterization of a Co-Sn-Co trilayer produced by thermal evaporation. Magnetization and magnetotransport measurements performed at low temperatures show that the sample has a complex behaviour related to the different morphologies of the external Co layers. A fitting procedure is introduced to disentangle the magnetization behaviour of different regions of the trilayer; three magnetic phases can be seen. Likewise, the magnetoresistance (MR) curves show the superposition of three different effects: a low-field positive MR, a slowly saturating negative MR similar to the one measured in granular systems, and an ordinary MR which becomes significant at very low temperatures. Combining magnetic and magnetotransport data, the three magnetic phases have been associated with the continuous Co underlayer, to the corrugated Co cap layer and to nanometre-sized Co islands embedded in the Sn layer ( respectively). The three-phase model coherently explains both magnetization and magnetoresistance datasets. A simple MR model based on a resistance network has been created to fit the experimental data; the fit is shown to match the main features of the experimental MR
Optimisation of a Multitarget Sputtering System for the production of thin films and multi-layers
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