1,721,002 research outputs found
Attuale ruolo dell’open window thoracostomy
No full textThe Open Window Thoracostomy (OWT) surgical method find its origin in the treatment of chronic tuberculous empyemas, in the cases where the drainage alone not permitted a sufficient cleaning of pleural cavity. In the recent years the indications for the execution of this method are extended also to metapneumoniae and post-pneumonectomy empyemas (for benign and malignant pathology), with or without bronco-pleural fistula, when these pathologies produces a general severe decline in the patient (septic shock). This method permit to effect a daily cleaning of a pleural cavity, through the introduction of a sterile gauzes imbued of specific antibiotic, reducing at least the purulent infection effects's previously present and favouring the reduction of the same cavity, in prevision of other reconstructive operations (thoracoplasty). Generally not many beloved by surgeons and patients (for the difficult management, aesthetic outcomes, the long stay in hospital), the OWT can often reestablish a dangerous situation, especially in the patients with a risk of septic shock. This study aims to analyse present indications, problems and therapeutics outcomes of this method, through the evaluation of 27 cases of OWT treated in the Department of Thoracic Surgery University of L'Aquila between the 1984 and the 1998
High plasticity reversible resistive switching in heteroepitaxial metal/CeO2-x/Nb:SrTiO3/Ti/Pt structures
No full textWe report on the characterization of resistive switching devices based on epitaxial CeO2 thin films as a functional material. CeO2 epitaxial thin films were grown by the pulsed laser deposition technique on conductive substrates. Platinum and titanium nitride top electrodes (TE) were successively deposited. Very good performances, in terms of resistivity switching and multilevel operation capability, were obtained using the Pt TE. The dependence of the low resistance and high resistance state on the TE material and on the CeO2 film thickness were explained. The electrical characteristics of these heterostructures make them promising as synapse for neuromorphic computation, but suggest also their use with multi-valued digital systems or multibit memory cells
Cyclase and phosphodiesterase activity on pre-T lymphoid human cells, treated with dimethyl sulfoxide (DMSO).
No full textOur aim is to estimate the role of the DMSO on pre-T lymphoid human cells, we have searched the cyclase and phosphodiesterase activity. We have studied the GTPspecific cyclase (G-Case) and have observed an analogous course to that one of the cAMP-PDE, where, in both cases, the differences ratio is approximately 5. For the cyclase activity values it has been found that cAMP neo formed is undeterminable in these cells, for the controls and the treated samples
Thin-film bulk-acoustic-resonator gas sensor functionalized with a nanocomposite Langmuir-Blodgett layer of carbon nanotubes
No full textA thin-film bulk acoustic resonator (TFBAR) based on a vibrating membrane of AlN/Si3N4 has been fabricated onto a silicon substrate and functionally characterized as gas sensor at a resonating frequency of 1.045 GHz. This novel TFBAR-based gas sensor has been functionalized by a sensing nanocomposite layer, prepared by a Langmuir-Blodgett (LB) technique, of single-walled carbon nanotubes (SWCNTs) embedded in a host matrix of organic material of cadmium arachidate. High-performance gas detection at room temperature of a SWCNT-coated TFBAR sensor has been reported. The sensing device exhibits high sensitivity (e.g., acetone: 12 kHz/ppm; ethylacetate: 17.3 kHz/ ppm), fast response (within 2-3 min), slow reversibility (within 1 h), and good repeatability (≤5% variation) of response toward tested organic vapors of acetone, ethylacetate, and toluene. © 2008 IEEE
Printing of amorphous and crystalline materials pre-machined using focussed ion beam patterning
No full textLaser Induced Forward Transfer (LIFT) is a laser-based direct write technique which has been routinely employed for trials of the deposition of organic and inorganic compounds, polymers and biomaterials on various substrates for the realisation of devices such as OLEDs [1]. This single-shot printing approach, which allows a spatially controlled pixel-by-pixel deposition has been widely trialled for printing as it enables operation in a standard ambient environment, has the ability to print a wide range of materials, allows printing of multilayered stacks composed of dissimilar materials, allows printing on both structured and planar substrates, and beam shaping of the incident laser pulse is also possible to further control the size and shape of the deposited material
Thin film bulk acoustic resonator vapor sensors with single-walled carbon nanotubes-based nanocomposite layer
No full textWe demonstrate the successful operation of a chemical microsensor based on Thin Film Bulk Acoustic Resonator (TFBAR) for organic vapor detection at room temperature. The TFBAR consists of a vibrating membrane of AIN/SI 3N4 fabricated on silicon substrate and resonating at the frequency of 1.045 GHz. Using a nanocomposite layer based on Single-Walled Carbon Nanotubes (SWCNTs) and prepared by the Langmuir-Blodgett technique onto the TFBAR device as highly-sensitive nanomaterial, the sensing performance of TFBAR sensor has been evaluated both as a passive device by a network analyzer with phase and insertion loss responses, and as oscillator with frequency response. The vapor sensing characteristics of SWCNTs-based TFBAR sensor are presented illustrating interesting results. © 2007 IEEE
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