1,721,046 research outputs found
Ingegneria tessutale e trattamento delle ulcere inveterate degli arti inferiori. Passato, presente e futuro
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A retrofitting technique using steel grids for existing masonry panels: a numerical and analytical study
No full textThe current research focuses on a numerical and analytical study aimed at investigating the efficiency of a steel-based reinforcement system suitable for existing masonry walls. The application of such a retrofitting technique, which consists of glued thin steel grids applied on both faces of a masonry panel, is reversible, cheap and easy to be executed and appears to be suitable especially for buildings with concrete slab or inter-stories beams to which the steel elements could be anchored. The study is based on a reference experimental test carried out at the “Politehnica” University of Timisoara (Romania), within the European FP6 project PROHITECH. The reference test provided the application of a constant ver-tical compression and cyclic horizontal displacements to an unreinforced brick-cement mortar wall in full-scale (1500 × 1500 × 250mm), to which was conferred a double-fixed constraint condition. Based on the experimental evidences, a reference numerical model has been implemented in ABAQUS, by adopting a plastic-damage material and a macro-element approach for the masonry modelling. Hence, in order to determine a design crite-rion of the studied system, a comparison with the analytical formulations available in the current Italian and European codes for the unreinforced configuration is presented in this study. Then, a wide parametric study on the investigated retrofitting technique has been carried out by varying thickness and spacing of steel grid elements, as well as the geo-metrical ratio of the panel (height/length). On the basis of the numerical results, a capac-ity formulation has been proposed, which takes into account the steel distribution in the masonry panel. The obtained outcomes revealed that the strength increase achievable by adopting the studied reinforcement system could be compared to the efficiency of a rein-forced masonry wall of new construction and it is strongly influenced by the geometrical ratio of the wall, as well as the steel distribution
[Human fibrin glue in the treatment of injuries of parenchymatous organs. Experimental research]
No full textDiagnostic and surgical approaches to recurrent varicose veins of lower limbs
No full textA consecutive series of 82 patients (98 legs) suffering from recurrent varicose veins underwent surgical treatment. In all patients clinical and hand-held US Doppler preoperative examinations were performed, but a phlebography was necessary in 33 legs to certainly visualize the anatomy of venous system and the potential sites of recurrent deep to superficial reflux. The causes of recurrence were: incompetent saphenofemoral junction in 59 legs, saphenopopliteal reflux in 6 legs, incompetence of perforator veins in 18 legs, both insufficiencies of great saphena and perforators in 15 legs. Seventy-four legs with saphenofemoral reflux underwent groin redissections through transversal (44 legs) or vertical (30 legs) incisions; the approach to the saphenopopliteal junction was vertical in two legs and transversal in four legs; the interruption of incompetent perforator veins was performed through incisions in 29 legs and according to Linton's technique in 4 legs. Clinical and US Doppler follow-up was performed every 6 months and no recurrent reflux was demonstrated; seven patients were affected from new small varices that were treated by injection sclerotherapy. This study indicates that more than 1/3 of recurrent varices need phlebography to be clearly studied: only diagnostic accuracy may assure a correct surgical approach, but the strategy of treatment must be adapted to the single patient
A two year experience with the use of Integra and thin skin grafts in the cure of complex leg ulcers
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[Effect of nutritional support by parenteral route on the immune state of the geriatric cancer patient]
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