350 research outputs found
Improvement of defect size and morphological estimation in shearography inspection by wavelet transform
No full textQuantitative Defect Size Estimation in Shearography Inspection by Wavelet Transform and Shear Correction
No full textBilateral auricular classic Kaposi's sarcoma
No full textIn 2009, a 57-year-old man was referred to our maxillo facial surgery department for the appearance of a reddish-purplish swelling on his right helix. The lesion was more than 1 cm in length and did not show changes for 3 months. He was otherwise healthy, without any predisposing factors. The patient denied smoking, alcohol misuse and intravenous drug use. He had no family history of similar lesions or Kaposi's sarcoma. The lesion was completely excised and the surgical defect reconstructed with a localflap. In 2011 the same patient returned to our attention because of the appearance of a new lesion, similar to the first one on the other auricle. The lesion was completely removed. The same situation recurred in September 2012, when the patient presented a new little reddish-purplish swelling of 3 mm on the left helix. The lesion was excised. The patient has not reported further lesion at present
Paradoxical embolism following intralesional sclerotherapy for cervical venous malformation
No full textWe present a rare case of a 47-year-old woman admitted to our maxillofacial surgery department for a large cervicofacial venous malformation. The patient underwent fluoroscopy-guided intralesional foam sclerotherapy with sodium tetradecyl sulfate and air under general anaesthesia. On awakening, after 48 h of endotracheal intubation, she displayed dysarthria and dysmetria. Her brain CT scan showed no haemorrhagic lesions. A chest CT scan ruled out a potential pulmonary embolism. Suspicion for a paradoxical embolism was high and echocardiography confirmed a patent foramen ovale, which acted as a passageway for the embolus. Transcranial ultrasound showed mild right-to-left heart shunting. The dysarthria and dysmetria disappeared gradually over 48 h, thus confi rming a reversible ischaemic neurological deficit. A brain MRI performed 1 week later showed no ischaemic or haemorrhagic lesions. The patient recovered completely. She was advised cardiosurgical follow-up and discharged
Census Transform Based Optical Flow for Motion Detection during Different Sinusoidal Brightness Variations
No full textThis work is a first approach of the implementation of a specific Optical Flow algorithm for motion detection in cases where the brightness variation is represented by a sine wave, whose characteristics vary across the different image sectors. The final goal would be the implementation of such an algorithm in thermal films recording a component undergoing a sinusoidal load. Mapping the motion field all over the thermal video time history, and deriving it in order to obtain a strain map, would enable both the simultaneous measurement of stress (by performing Thermoelastic Stress Analysis) and strain by a unique video, and the possibility of stress calibration, thus linking the digital levels in output to real stress values. In this scenario, the authors present the implementation of Census Transform based Optical Flow on a simulated video, where the brightness variation is modeled like the superimposition of sine waves equal for all pixels and different Gaussian spatial distributions frame after frame. The latter is used for creating different sine patterns for each image sector
Mesenchymal phosphaturic tumour : early detection of recurrence
No full textThe case of a recurrent phosphaturic mesenchymal tumour of the maxillary sinus 10 years after the first surgical excision is reported. The neoplasm first presented with paraneoplastic osteomalacia causing a pathological femur fracture. A right maxillary sinus tumour was identified and treated thereafter. The patient had no local symptoms and serum electrolytes returned to normal after surgical removal of the tumour. However, 10 years later, the patient's urine Ca and P levels increased and an octreoscan detected a new tumour in the right maxillary sinus. Early diagnosis prevented the effects of the paraneoplastic activity of the neoplasm. This case emphasises the importance of specific, close follow-up, because the neoplasm rarely produces local signs indicating its position. To our knowledge, this is the first reported case of a late relapse presenting without relevant symptoms (local pain or swelling or pathological fractures)
Effects of nonideal features of silicon photomultiplier on the measurements of quantum correlations
No full textWe analyze the effects of some stochastic deviations from the ideal response in silicon photomultipliers that prove to be detrimental for the measurement of quantum properties of light. We demonstrate that an optimized operation mode can overcome some limitations of the detectors allowing the characterization of entanglement in mesoscopic twin-beam states
Cleavage of benzyloxycarbonyl-5-oxazolidinones to α-benzyloxycarbonylamino-α-alkyl esters by alcohols and sodium hydrogen carbonate
No full textThe reaction of benzyloxycarbonyl-5-oxazolidinones with alcohols and sodium hydrogen carbonate to afford the corresponding benzyloxycarbonyl esters is described
Conditional measurements with silicon photomultipliers
No full textNonclassical states of light can be efficiently generated by performing conditional measure-ments. An experimental setup including Silicon Photomultipliers can currently be implemented for this purpose. However, these devices are affected by correlated noise, the optical cross talk in the first place. Here we explore the effects of cross talk on the conditional states by suitably expanding our existing model for conditional measurements with photon-number-resolving detectors. We assess the nonclassicality of the conditional states by evaluating the Fano factor and provide experimental evidence to support our results
Da Assuan a Piazza Affari. Ricerca di dipendenze a lungo termine nei rendimenti dei titoli azionari
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