201,188 research outputs found
Thermal response of target tissues to laser irradiation. An optical and thermal model applied to vein wall
No full textSourcerecord Id Scopus 2375
Endovenous laser treatment for great saphenous vein appears to be an useful alternative to conventional surgery in treatment of advanced varicose veins, in ambulatory regimen too. A recurring problem in laser applications is estimating the thermal response of target tissues to laser irradiation. This typically involves using an optical model to determine the distribution of absorbed laser energy and then using a thermal model to establish the temperature during and after laser irradiation. In the present work we have calculated the power irradiation of the walls of vessel, hypothesising a diameter of the vein cm 0.8-1.5, a length cm 70-90 and haematic flow equal zero. We used Lambert-Beer law, assuming a cylindrical symmetry in the incoming intensity irradiation (I-o), as in the case in the TEM00 mode. Omitting details we calculated a power irradiation, depending on the vein diameter, of 10-20 watt using diode laser 980 nm. This study offers high importance data in order to foresee the effective transfer of thermal damage to the vein wall through absorption of laser energy.http://apps.webofknowledge.com/full_record.do?product=UA&search_mode=GeneralSearch&qid=1&SID=Q1i@gpCm9b3mdEmO@n6&page=2&doc=1
An adapter for vascular anastomoses
No full textCitato 31 volte in letteratura Internazionale. Fonte: Google Scholar TM (http://scholar.google.it/citations?view_op=view_citation&hl=it&user=kBDwPNgAAAAJ&citation_for_view=kBDwPNgAAAAJ:d1gkVwhDpl0C)
An adapter for vascular anastomoses having perimetral edges, characterized in that it comprises at least one main conduit and at least one branch conduit, the prosthesis being realized with biocompatible material
Reinventare lo spazio pubblico con la musica. Il caso del Viaduto Santa Tereza a Belo Horizonte
No full textNelle metropoli mondiali la perdita dello spazio pubblico è spesso motivata dalla costruzione di infrastrutture viarie che s’incrociano nei luoghi più disparati della città, dando vita a quelli che vengono chiamati spazi residuali: spazi privi di alcun sistema simbolico che risultano insigni canti dal punto di vista identitario (Duhau, 2001; Huet, 2009; Koolhas, 2006). In questo lavoro viene analizzato il caso di uno spazio residuale a Belo Horizonte (Brasile): il Viaduto Santa Tereza - un vuoto urbano, un ritaglio in eccedenza per urbanisti e residenti. L’appropriazione di questi luoghi attraverso azioni culturali (come, nel caso analizzato, la musica hip-hop) rappresenta una possibile forma di rivitalizzazione grazie a cui queste aree non solo recuperano il proprio senso di luogo dell’incontro, ma si trasformano in luoghi simbolici, partecipati, e fruibili dalla comunità. La musica infatti, in quanto «agglomeratore sociale», approssima gruppi sociali distinti e permette il dialogo e il riconoscimento del diritto alla città per mezzo della creazione musicale (Fani, 2007; Lamotte, 2014). Questa fa sì che il cittadino/attore si appropri della città, con la potenzialità di poterla rinnovare/trasformare, generando la possibilità di vivere nuovi (o vecchi) spazi della città che no a quel momento non erano sentiti come sicuri o vivibili: in questo senso, il movimento musicale hip-hop ha agevolato, nelle città di tutto il mondo, un processo di rottura con l’isolamento di «territori dimenticati» (Black, 2014; Dayrell, 2001; Lamotte, 2004
Endovenous laser treatment of great saphenous vein with a 980 nm DIODE LASER. Early and mid-term results
No full textAbstract: We report the early and mid-term results in the treatment of the great saphenous vein (GSV) by endovenous laser diode 980 nm. Despite a rapid spread of the technique, not all is known about the laser-tissue interaction in endovenous laser treatment (EVLT). We developed this study to assess the safety and efficacy of EVLT, a recent percutaneous technique for permanent occlusion of the incompetent GSV
Thermal response of target tissues to laser irradiation. An optical and thermal model applied to vein wall
No full textAbstract: Endovenous laser treatment for great saphenous vein appears to be an useful alternative to conventional surgery in treatment of advanced varicose veins, in ambulatory regimen too. A recurring problem in laser applications is estimating the thermal response of target tissues to laser irradiation. This typically involves using an optical model to determine the distribution of absorbed laser energy and then using a thermal model to establish the temperature during and after laser irradiation. In the present work we have calculated the power irradiation of the walls of vessel, hypothesising a diameter of the vein cm 0.8-1.5, a length cm 70-90 and haematic flow equal zero. We used Lambert-Beer law, assuming a cylindrical symmetry in the incoming intensity irradiation (I-o), as in the case in the TEM00 mode. Omitting details we calculated a power irradiation, depending on the vein diameter, of 10-20 watt using diode laser 980 nm. This study offers high importance data in order to foresee the effective transfer of thermal damage to the vein wall through absorption of laser energy
M-DUST: an Innovative Low-Cost Smart PM Sensor
No full textIn this work, we present M-DUST, a novel low-cost and real-time smart monitoring sensor for Particulate Matter (PM) emission measurement. It is based on the Tyndall scattering process to count particles concentration. A comparison on different methods to evaluate particles concentration has been discussed. A mechanical filter is used to select the particulate matter with the appropriate cut-off aerodynamic diameter. The presented device is an intelligent sensor thanks to its features, such as: ability to make self-diagnosis, self-adaptation and transparency to communication interface. Tests are carried out in the Italian city of Taranto by using non-toxic substances and analysis chamber
Ambientalismo, Eco-Socialismo o Vangelo? Ecologia e depoliticizzazione in Papa Francesco
No full textPer quanto nella storia della chiesa cattolica esistano istanze ambientaliste individuate già in passato da vari studiosi , il presente contributo mira piuttosto a delineare l’ipotesi di una rottura importante di prospettive e posizionamento dell’attuale papato, relativamente al rapporto fra ambiente, sostenibilità socio-ambientale e modelli di sviluppo. Tuttavia, tale approccio rischia di essere facilmente vanificato, finendo – paradossalmente – per neutralizzare il suo messaggio chiave. Quello a cui va incontro il messaggio ambientalista della Chiesa rischia infatti di essere sostituito a un processo di depoliticizzazione, che è oggetto di dibattito relativamente a quella che oggi viene definita l’era post-politica, post-ideologica o, contestualmente, post-ecologica
Integrated geophysical survey for the geological structural and hydrogeothermal study of the North-western Gargano promontory (Southern Italy)
No full textA multimethodological geophysical survey was performed in the north-western part of the Gargano promontory to study the geological structural setting and the underground fluid flow characteristics. The area has a complex tectonics with some magmatic outcrops and shallow low-enthalpy waters. Electrical, seismic reflection, gravimetric and magnetic surveys were carried out to reconstruct the geological structures; and in order to delineate the hydrogeothermal characteristics of the area, the self-potential survey was mainly used. Moreover magnetic and self-potential measurements were also performed in the Lesina lake. The joint three-dimensional interpretation of the geophysical data disclosed a large horst and graben structure covering a large part of the area. In the central part of the horst a large ramified volcanic body was modelled. The models show some intrusions rising from it to or near to the surface. The main structures are well deep-seated in the Crust and along them deep warm fluids rise as the SP data interpretation indicates
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