1,354,559 research outputs found
Entrevista a Fabrizio Micari
No full textREMOTE: Assessing and evaluating remote learning practices in STEM, projecte Erasmus finançat en el marc del programa Erasmus+; Projecte: Grant Agreement number: 2022-1-ES01-KA220-HED-000085829Prof. Fabrizio Micari, Engineer and Former Rector of the University of Palermo, answers the following questions: 1. How do you imagine the university of the future?, a. What teaching and assessment methodologies do you mostly imagine? b. What learning technologies do you think will prevail?; 2. How will the students of the future be different from those of today? (demands, expectations,...); 3. How will online / remote assessment methodologies affect learning practices in STEM, differently depending on… a. the gender? (students / faculty) b. the studies typology?, Will it be different in STEM studies from the rest? and 4. How can remote assessment improve development in higher education?7119_01.mp4
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On the Choice of Tool Material in Friction Stir Welding of Titanium Alloys
No full textFriction Stir Welding (FSW) is a solid state welding process patented in 1991 by TWI; initially adopted to weld aluminum alloys, is now being successfully used also for magnesium alloys, copper and steels. The wide diffusion the process is having is due to the possibility to weld both materials traditionally considered difficult to be welded or "unweldable" by traditional fusion welding processes due to peculiar thermal and chemical material properties, and complex geometries as sandwich structures and straightening panels. Recently, research is focusing on titanium alloys thanks to the high interest that such materials are getting from the industry due to the extremely high strength-weight ratio together with good corrosion resistance properties. At the moment, the main limit to the industrial applicability of FSW to titanium alloys is the tool life, as ultra wear and deformation resistant materials must be used. In this paper a, experimental study of the tool life in FSW of titanium alloys sheets at the varying of the main process parameters is performed. Numerical simulation provided important information for the fixture design and analysis of results. Tungsten and Rhenium alloy W25Re tools are found to be the most reliable among the ones considered
Tibioperoneal trunk pseudoaneurysm coil embolization
No full textIntroduction: Pseudoaneurysms of the tibioperoneal trunk are rare and can be limb threatening. There are various treatment options to seal pseudoaneuryms both percutaneously and via open surgery.
Case report: Description of the case of a large tibioperoneal trunk pseudoaneurysm that has been successfully treated by coil embolization in a patient with a previous endocarditis.
Conclusion: Endovascular treatment of pseudoaneurysm should be considered as an alternative treatment option to open surgery
Rationale and Design of the IN.PACT BTK Randomized Pilot Study: A Paclitaxel Drug-Coated Balloon vs Standard Percutaneous Transluminal Angioplasty for Infrapopliteal Chronic Total Occlusions
No full textObjectives. This is a pilot feasibility study and the objective is to evaluate the safety and effectiveness of the investigational device, IN.PACT 014 drug-coated balloon (DCB), compared with standard percutaneous transluminal angioplasty (PTA) in the treatment of patients with chronic limb-threatening ischemia (CLTI) with chronic total occlusions (CTOs) of below-the-knee (BTK) arteries. Methods and Design. The IN.PACT BTK randomized study is a prospective, multicenter, randomized pilot study. Baseline angiography and duplex ultrasonography analyses were performed to confirm that participants met all anatomic and functional eligibility criteria. Successful predilation and strict intraprocedural angiographic and duplex sonographic criteria were conditions of enrollment and randomization. A total of 50 participants were enrolled and randomized 1:1 into DCB (n = 23) or control PTA (n = 27) treatment groups. The primary effectiveness endpoint is late lumen loss at 9 months post procedure. Secondary endpoints include a composite safety endpoint (freedom from device- and procedure-related mortality within 30 days, and freedom from major target-limb amputation and freedom from clinically driven target-lesion revascularization within 9 months after the procedure) and the rate of major adverse events. Participants are being followed through 5 years. All angiographic and duplex ultrasonography images are reviewed by independent core laboratories and all major adverse events are adjudicated by an independent clinical events committee. Discussion and Conclusion. This is a rigorously designed BTK trial in which participant selection and enrollment were a unique aspect, guided by a strict requirement for successful vessel preparation before randomization using explicit angiographic and duplex ultrasound parameters
Incremental Forming Process For The Accomplishment of Automotive Details
No full textIn the last decades the scenario of the industrial production is remarkably changed, since new market requirements have to be faced by the industries. The market, actually, more and more, asks for vary models and niches product. The necessity to intercept dynamically and to satisfy the demands for the market, driver of the innovation process, involves the necessity to reduce the Time-to-market introducing to new methodologies of engineering, like the 3D-prototyping, for the qualitative and structural analysis of the final component. For these reasons, at the beginning of the nineties, a new philosophy of sheet metal forming process begins to assert on the industrial scene, whose basic logic is to obtain the shape wished through the progressive action of a tool of simple shape
Update on the TURBO BOOSTER spectranetics laser for lower extremity occlusive disease.
No full textIn the last two decades the endovascular treatment of peripheral arterial occlusive disease (PAOD) has gained a widespread and predominant role. New technologies have developed in the last years as atherectomy devices, self expandible nitinol stents, drug eluting devices (stent and balloons), absorbable stents. In recent years, growing interest has been dedicated to laser technology due to device improvements and literature data reporting safety and efficacy of excimer laser. The role of this new endovascular technique for the treatment of atherosclerotic arterial diseases should be considered with regard to two fields of interest: the claudicatio intermittens (CI) and the critical limb ischemia (CLI). A 20-year history with medical lasers has proven that not all lasers are equal. Lasers used and studied in the late 1980s and 1990s had poor outcomes due to inappropriate laser selection and undefined laser techniques. Over the last 10 years, multicenter studies with the excimer laser confirm that case selection, appropriate utilization of equipment, application of safe lasing techniques, and knowledge of indications and contraindications, all contribute to the successful application of laser-assisted angioplasty in complex coronary and peripheral artery disease. If applied properly, the Excimer Laser is a useful technique to transform complex obstructive arterial disease into more treatable lesions, improving the results of endovascular treatment and lowering the threshold of intervention for ''untreatable'' patients. New larger studies are requested to assess the definitive role of this technique in PAD treatment and limb salvage. This review will discuss the Laser Phisics and application in PAD along with the clinical data available to support the Excimer Laser as a reliable technology for endovascular intervention
On the field variables influence on bonding phenomena during FSW processes: experimental and numerical study
No full textSolid state bonding recurs in several manufacturing processes, as Friction Stir Welding
(FSW), Linear Friction Welding (LFW), extrusion of hollow profiles and Accumulative Roll
Bonding (ARB). The former processes are nowadays of particular industrial interest because of the
specific advantages with respect to the classic welding technologies. In FSW the solid state bonding
is obtained between an undeformed “cold” material, already placed in the advancing side of the
joint, and the “hot” material flow incoming from the retreating side. Proper conditions of pressure,
temperature, strain and strain rate are needed in order to get the final effective bonding. In the paper
experimental tests on butt joints made out of AA6061-T6 aluminum alloys are used to identify the
sets of process parameters resulting either in sound or poor joints. The same process conditions have
been simulated used an already developed model in order to highlight the actual bonding line and
the values of the main field variables determining the soundness of the joints. Finally a correlation
between process parameters values, field variables values and joint effectiveness is made
Shockwave intravascular lithoplasty for the treatment of calcified carotid artery stenosis: A very early single-center experience
No full textEndovascular treatment of calcified carotid disease represents one of the main challenges for the interventionalists. Plaque calcium load is one of the most important factors affecting the risk of procedural complications. A new tool called Shockwave intravascular lithotripsy (S-IVL; Shockwave Medical, Inc.) has been recently approved for the treatment of heavily calcified coronary and lower limb arteries but minimal data exist about the treatment of carotid arteries. We report our early experience of carotid stenting using S-IVL. We report two cases of symptomatic patients with severely calcified carotid artery diseases who were turned down for vascular surgeries. The first case was successfully performed through radial access using a distal cerebral embolic protection device in the context of contralateral carotid occlusion. In the second case, a very tight and calcified left internal carotid artery stenosis was successfully treated through femoral access using a proximal cerebral protection device. In both cases, advanced imaging confirmed effective calcium debulking and good stent expansion after IVL treatment. S-IVL effectiveness basically resides in integrating the effect of balloon angioplasty with the calcium-disrupting power of sonic pressure waves. This could be able to minimize the risk of cerebral embolization due to aggressive conventional balloon predilatation or poststenting dilatation usually needed to obtain an adequate luminal gain in carotid stenting. According to our small case series, the use of S-IVL for the treatment of heavily calcified carotid artery lesions seems to be helpful in this particular setting
3D finite element analysis of tool wear in machining
No full textThe paper is focused on the 3D numerical prediction of tool wear in metal cutting operations. In particular, an analytical model, able to take into account the diffusive wear mechanism, was implemented through a specific subroutine. Furthermore, an advanced approach to model heat transfer phenomena at the tool–chip interface was included in the numerical simulation. The adopted simulation strategy gave the possibility to properly evaluate the tool wear. The 3D FEM results were compared with some experimental data obtained turning AISI 1045 steel using uncoated WCtool; a good agreement was
found out
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