245 research outputs found
Distribuzione geografica relativa a reperti operatori Gozzo con eutiroidismo.dell'Ospedale dell'Aquila (dal 1954 al 1979) e di Popoli ( dal 1960 al 1979).
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Carbon nanofibers in polyurethane foams: Experimental evaluation of thermo-hygrometric and mechanical performance
No full textPolymer nanocomposites synergistically combine the good thermal properties of the hosting polymer matrix with the high mechanical performance of the fillers, providing a new class of materials with superior properties. The present study aims to evaluate in a multidisciplinary way the enhancement in mechanical and thermal-hygrometric properties of low and medium density nanophased polyurethane (PUR) foams with either randomly oriented or aligned nanofibers as compared to the neat ones. To this aim, 1% weight of carbon nanofibers (CNFs) were homogeneously dispersed into polyol of PUR foam by an ultrasonic cavitation method. In parallel, a small amount of CNFs was functionalized in advance by a co-precipitation method so as to align them into the polymer matrix through an external low intensity magnetic field. SEM analyses were used to compare the microstructure of the neat and nanophased samples. Results have shown that the addition of carbon nanofibers in the foams products a closer structure with a more uniform size and shape. Moreover, functionalized CNFs play a significant role in regulating cells shape as well as strengthening cells walls. Mechanical test results also demonstrated that CNFs increase both strength and stiffness of the samples. The alignment of carbon nanofibers within medium density nanophased foams determines the highest mechanical properties. However, the more noticeable improvement in samples performance occurred in low density nanophased foams. Finally, carbon nanoparticles decrease the thermal conductivity and increase the resistance against water adsorption
Motor Imagery e apprendimento motorio: studio di potenziali evocati motori prima e dopo allenamento isocinetico dell’arto inferiore
No full textVidéo-endoscopie: au-delà de I'image
No full textThe performance of an electronic system for image processing and analysis in digestive videoendoscopy are illustrated in this paper. The main clinical advantage offered by this system is its interactivity during the endoscopic examination. © 1990 Springer-Verlag
Early acid perception in NERD
No full textHeartburn is the hallmark of gastroesophageal reflux disease. The hypothesis tested in this study is that the time of onset of this symptom may play a role in the development of mucosal lesions. During endoscopy of 61 patients complaining of heartburn and nine control subjects, gastric fluid was aspirated using a catheter introduced through the operative channel, and blindly instilled onto the esophageal mucosa before withdrawing the endoscope. Saline was used as control. Evocated symptoms and endoscopic lesions were recorded. Thirty-seven patients did not present esophageal lesions (nonerosive reflux disease [NERD]); 24 presented esophagitis (ERD). Instillation of gastric fluid on the esophageal mucosa elicited heartburn in 46% of patients with NERD, 8.3% with ERD, and 11.1% of controls. Symptoms lasted throughout the procedure but were no longer present when the gastroscope was withdrawn. The NERD value was significantly higher than that of ERD (P= 0.02) and controls (P= 0.02), while no difference was found between ERD and controls. Saline did not induce symptoms either in controls or patients. NERD patients show an early response to gastric fluid instillation much more frequently than ERD and controls. It is hypothesized that the early onset of symptoms in NERD patients may be a possibility to avoid the progress of mucosal lesions by claiming an earlier medical care
Incidenza della patologia benigna della cervice uterina su 1517 reperti operatori di isterectomia.
No full textRELATIVE DISPERSION ANALYSIS OF HIGH PASS RESOLUTION PERIMETRY (H.P.R.P.) RESULTS IN EARLY GLAUCOMA AND GLAUCOMA SUSPECTS
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