124,847 research outputs found
Italia e Asia centro-meridionale
No full textThe article deals with the current political and geopolitical situation in the Central and Southern Asia, underlining in particular the complex situation in Pakistan, Afghanistan and in the former Soviet Central Asi
L'Italia e l'Asia centro-meridionale
No full textThe article deals with the current political and geopolitical situation in the Central and Southern Asia, underlining in particular the complex situation in Pakistan, Afghanistan and in the former Soviet Central Asia and their relations with Ital
Iran: un indecifrabile anno in vista delle nuove elezioni
No full textanalysis of the domestic political situation within the Islamic Republic of Iran and its geopolitical role in the regio
The Experience of Normativity and the Normativity of Experience: Towards a Genealogy of Legal Experience between Anthropology and Neo-Kantianism
No full textThe Role of Endoscopic Assistance in Surgery for Pediatric Cholesteatoma in Reducing Residual and Recurrent Disease
No full textThe primary aim of this study was to evaluate long-term recurrent and residual disease after surgery for acquired cholesteatoma in children according to surgical approach. A total of 71 interventions performed on 67 pediatric patients were included in the study. Canal wall-up tympanomastoidectomy (CWUT) was performed in 31 ears (13 with endoscopic assistance), a transcanal esclusive endoscopic approach (TEEA) was used in 22, and canal wall-down tympanomastoidectomy (CWDT) was performed in 18. Overall, the cholesteatoma relapse rate estimated by the Kaplan-Meier method was 47 +/- 6% at 12 years; the recurrent cholesteatoma rate was 28 +/- 6% and the residual cholesteatoma rate was 26 +/- 5%. The relapse rate according to surgical approach was 33 +/- 11% for CWDT, 60 +/- 9% for CWUT, and 40 +/- 11% for TEEA (p = 0.04). The difference for recurrent disease was no recurrent disease for CWDT, 42 +/- 9% for CWUT, and 32 +/- 11% for TEEA (p = 0.01). The residual disease rate was significantly reduced with endoscopy: 42 +/- 8% without endoscopy vs. 9 +/- 5% with (p = 0.003). CWDT can still be considered in primary surgery in case of extensive cholesteatomas and small mastoid with poor pneumatization. TEEA can be recommended for small cholesteatoma not extending to the mastoid to reduce morbidity. Endoscopic assistance seems useful to reduce residual disease in CWUT, whereas it does not have a significant impact on preventing recurrent disease
PROPAGATION TIME OF CARBON STEEL BARS IN CARBONATED CONCRETE MADE WITH DIFFERENT BINDERS
No full textEndoscopic approach to the round window through posterior tympanotomy for cochlear implantation in children: A study on feasibility
No full textObjective: To demonstrate the feasibility of rigid endoscopy through posterior tympanotomy, which provides both a view of the round window and direction of the scala tympani in children. Methods: After a standard mini-invasive surgical approach with postauricular access and transmastoid posterior tympanotomy of 2 mm, a 0°, 1.9 mm diameter and 11 cm long endoscope is positioned in proximity of the upper part of the posterior tympanotomy to obtain a panoramic view of the inferior part of the medial wall of the tympanic cavity. Surgical complications and changes in hearing threshold were analyzed. Results: Eight children were submitted to cochlear implantation with endoscopic assistance through posterior tympanotomy. Complete visualization of the round window niche was possible in every ear. No complications related to the procedure were observed. Preoperative threshold was preserved in 9 of 10 ears. Conclusions: Direct endoscopic view through the posterior tympanotomy allows visualization of the entire round window niche as well as the angle of introduction of the multi-electrode array along the direction of the scala tympani
Evaluation of evaporation flux in building materials by infrared thermography
No full textThe presence of water inside the walls can be considered one of the most important causes of degradation in historical buildings. This is particularly due to evaporation which can give rise to salt deposits inside the superficial pores. Evaporation flux from wall surfaces can be estimated quantitatively by measuring the temperature which depends in a sensitive way on the evaporation rate. At equilibrium condition among all the different kind of heat exchange the wall temperature depends essentially on the evaporation rate and the thermal properties of the material (porosity, conductivity).
In the Archaeometry lab of “Istituto di Fisica Generale Applicata” we performed some experiments on several brick, plaster and stone specimens with different porosity in order to obtain different evaporation rates. We employed a climatic room where environmental parameters (temperature, RH, ventilation and irradiation) are controlled and cooling effects due to evaporation are investigated by a SW IR thermographic system in steady conditions in order to understand the relation between evaporation flux (), water content (Wc) and surface temperature (Ts).
Table of comparative values of these three variables (, Wc, Ts ) were obtained for several materials and applicability limits of the thermographic technique for moisture detection are discussed
Metodi per la misura dell’umidità nei materiali dell’edilizia storica: legno e intonaci
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