A5070400009- Ultrasonics and Acoustic Wave Propagation
- Ultrasound Imaging and Elastography
- Optimization and Variational Analysis
- Advanced Optimization Algorithms Research
- Acoustic Wave Resonator Technologies
- Advanced MEMS and NEMS Technologies
- Acoustic Wave Phenomena Research
- Piezoelectric Actuators and Control
- Advanced Sensor and Energy Harvesting Materials
- Electrical and Bioimpedance Tomography
- Flow Measurement and Analysis
- Structural Health Monitoring Techniques
- Economic theories and models
- Antenna Design and Optimization
- Contact Mechanics and Variational Inequalities
- Image and Signal Denoising Methods
- Fixed Point Theorems Analysis
- Transportation Planning and Optimization
- Point processes and geometric inequalities
- Material Properties and Applications
- Microwave Imaging and Scattering Analysis
- Matrix Theory and Algorithms
- Numerical Methods and Algorithms
- Engineering Applied Research
- Underwater Acoustics Research
University of Pisa
2012-2023
University of Salerno
1993-2013
Roma Tre University
2003-2012
Software AG (Italy)
2009-2010
Istituto Nazionale di Fisica Nucleare, Sezione di Roma Tre
2009
Sapienza University of Rome
2002-2005
Istituto Nazionale di Fisica Nucleare, Sezione di Catania
2004-2005
Università degli Studi Internazionali di Roma
1999
University of Pannonia
1994
Institute of Mathematics
1994
Medical ultrasonography is a powerful and cost-effective diagnostic technique. To date, high-end medical imaging systems are able to efficiently implement real-time image formation techniques that can dramatically improve the capabilities of ultrasound. Highly performing thermally efficient ultrasound probes then required successfully enable most advanced techniques. In this context, transducer technology current limiting factor. Capacitive micromachined ultrasonic transducers (CMUTs)...
Capacitive micromachined ultrasonic transducers (CMUTs) bring the fabrication technology of standard integrated circuits into field ultrasound medical imaging. This unique property, combined with inherent advantages CMUTs in terms increased bandwidth and suitability for new imaging modalities high frequency applications, have indicated these devices as generation arrays acoustic The advances microfabrication made possible to fabricate, few years, silicon-based electrostatic competing...
Ultrasound beams propagating in biological tissues undergo distortions due to local inhomogeneities of the acoustic parameters and nonlinearity medium. The spectral analysis radio-frequency (RF) backscattered signals may yield important clinical information field tissue characterization, as well enhancing detectability parenchymal diseases. In this paper, we propose a new imaging technique based on wavelet packets (WP) decomposition. conventional ultrasound system, received echo-signals are...
Modeling of capacitive micromachined ultrasonic transducers (cMUTs) is based on a two-port network with an electrical and mechanical side. To obtain distributed model, solution the differential equation motion diaphragm for each element transducer has to be found. Previous works omit load cavity behind diaphragm, i.e., effect gas inside. In this paper, we propose model cMUTs that takes into account. A closed-form impedance membranes been obtained, including restoring forces because stiffness...
The gLite Workload Management System (WMS) is a collection of components that provide the service responsible for distributing and managing tasks across computing storage resources available on Grid. WMS basically receives requests job execution from client, finds required appropriate resources, then dispatches follows jobs until completion, handling failure whenever possible. Other than single batch-like jobs, compound types handled by are Directed Acyclic Graphs (a set where...
In the design of low-frequency transducer arrays for active sonar systems, acoustic interactions that occur between elements have received much attention. Because these interactions, loading on each depends its position in array, and radiated power may vary considerably from one element to another. Capacitive microfabricated ultrasonic transducers (CMUT) are made a two-dimensional array metallized micromembranes, all electrically connected parallel, arid driven into flexural motion by...
In this paper we report the design, fabrication process, and characterization of a 64-elements capacitive micromachined ultrasonic transducer (cMUT), 3 MHz center frequency, 100% fractional bandwidth. Using transducer, developed linear probe for application in medical echographic imaging. The was fully characterized tested with commercial scanner to obtain first images from phantoms vivo human body. results, which quickly follow similar results obtained by other researchers, clearly show...
In the present work, a traveling wave ultrasonic motor (TWUSM) is proposed. It composed of an annular-shaped stator and two cone-shaped rotors that are pressed in contact to borders inner surface stator. A rotating has been generated by using as vibration generators bolted Langevin transducers (BLT) opportunely shifted space time. The vibrational behavior well generation simulated with finite-element method (FEM) software. prototype manufactured experimentally characterized. exhibits static...
Abstract A globally convergent algorithm for equilibrium problems with differentiable bifunctions is proposed. The based on descent directions of a suitable family gap functions. novelty the approach that assumptions which guarantee stationary points functions are global optima not required. Keywords: problemgap functiondescent method AMS Subject Classification : 90C3049M3765K05
Recently, a linear, analytical distributed model for capacitive micromachined ultrasonic transducers (CMUTs) was presented, and an electromechanical equivalent circuit based on the theory reported used to describe behavior of transducer [IEEE Trans. Ultrason. Ferroelectr. Freq. Control 49, 159-168 (2002)]. The is applied here calculate dynamic coupling factor k(w) lossless CMUT, definition that involves energies stored in vibration cycle, results are compared with those obtained lumped...
In this paper an approximated 3-D model of cylinder shaped piezoceramics is described. the hypothesis axial symmetry, element vibration in extensional and radial directions described by two coupled differential wave equations. The obtained choosing, as solution these equations, orthogonal functions, each depending only on one axis, corresponding to propagation direction. mechanical boundary conditions are applied imposing continuity between stresses external forces surfaces integral way,...
We address the window design problem of linear arrays to be used in wide-band beamforming systems. During last decades, stochastic optimization algorithms have proven very efficient optimal synthesis, but most research interest has focused on and two-dimensional under narrow-band excitation. In present paper, we introduce a general approach, based simulated annealing algorithm, uniformly spaced that generate low side-lobe level beam patterns. The effectiveness different pattern formulations...
Resource management and scheduling of distributed, data-driven applications in a Grid environment are challenging problems. Although significant results were achieved the past few years, development proper deployment generic, reliable, standard components present issues that still need to be completely solved. Interested domains include workload management, resource discovery, matchmaking and brokering, accounting, authorization policies, access, reliability dependability. The evolution...
In this work we report on the performance optimization of a recently developed high frequency CMUT probe. By leveraging advantages offered by our proprietary "Reverse Fabrication Process (RFP)" technology, have an efficient and reliable packaging process, useful for fabrication small sized ultrasound probe-heads. We maximized connecting probe-head to multichannel analog front-end electronic circuits housed into An experimental comparison with equivalent piezoelectric probe, LA435...
An optimization method is proposed for linear arrays to be used in ultrasound systems under wide-band operation. A fast algorithm, the threshold accepting, has been utilized determine element positions and weight coefficients of a array that generates desired beam pattern. To reduce computational burden procedure, an efficient numerical routine pattern evaluation implemented. We address problem both dense sparse arrays. In first case, goal minimize side-lobe energy by varying weights; we...