1,721,156 research outputs found
Infiltration Condition and Mouldability Diagram in Resin Injection Moulding
Full text linkThis paper deals with the modelling of injection moulding processes taking into account the deformability of the preform and the polymerisation of the resin. The coupled flow-deformation problem in the infiltrated and dry region is formulated with the corresponding boundary conditions and with the proper evolution equations determining the motion of the boundaries. An approximated analytical discussion is performed to obtain some estimates on the infiltration velocity, helping in identifying a window of applicability in the parameters space (i.e., the mouldability diagram), which fits well with the numerical simulations
Volume conductor models in surface electromyography: Applications to signal interpretation and algorithm test
No full textSimulation of surface electromyogram (EMG) has provided support for the development and testing of
algorithms (e.g., for the extraction of amplitude or spectral properties of the EMG or for the estimation of
the muscle fiber conduction velocity) and for the interpretation of experimental results. This is the
second part of a pair of papers: the first explains the methods for the development of structure based
models of surface EMG; this one provides a summary of interesting applications for the interpretation of
signals and testing of algorithms. Simulations from some models already introduced in the literature are
compared. Moreover, estimation of indexes from an innovative layered volume conductor including a
subcutaneous tissue with variable thickness in space is studied
Separation of interference surface electromyogram into propagating and non-propagating components
Full text linkShort range tracking of rainy clouds by multi-image flow processing of X-band radar data
Full text linkAbstract Two innovative algorithms for motion tracking and monitoring of rainy clouds from radar images are proposed. The methods are generalizations of classical optical flow techniques, including a production term (modelling formation, growth or depletion of clouds) in the model to be fit to the data. Multiple images are processed and different smoothness constraints are introduced. When applied to simulated maps (including additive noise up to 10 dB of SNR) showing formation and propagation of objects with different directions and velocities, the algorithms identified correctly the production and the flow, and were stable to noise when the number of images was sufficiently high (about 10). The average error was about 0.06 pixels (px) per sampling interval (ΔT) in identifying the modulus of the flow (velocities between 0.25 and 2 px/ΔT were simulated) and about 1° in detecting its direction (varying between 0° and 90°). An example of application to X-band radar rainfall rate images detected during a stratiform rainfall is shown. Different directions of the flow were detected when investigating short (10 min) or long time ranges (8 h), in line with the chaotic behaviour of the weather condition. The algorithms can be applied to investigate the local stability of meteorological conditions with potential future applications in nowcasting.</p
Estimation of monopolar signals from sphincter muscles and removal of common mode interference
Full text linkNeuromuscular system engineering
No full textSi tratta del libro di testo del corso di Ingegneria del Sistema Neuromuscolare del Politecnico di Torino rivolto principalmente a studenti di Ingegneria Biomedica
Estimation of monopolar signals from spincter muscles and removal of common mode interference
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Multiphase Systems with Applications to Composite Materials Manufacturing
No full textThe present thesis is devoted to the mathematical modeling of an industrial process of production of composite materials, in the framework of the theory of porous media. The following Introduction is devoted to the presentation of the main process problems concerning the production of composite materials and the most important applications. The first part of the thesis is dedicated to an introduction to continuum mechanics. In the first three chapters the basic theory of a single component continuum is presented, introducing some geometrical and kinematics tools, the balance equations in both a three dimensional and a two dimensional continuum, and the constitutive theory, stressing the principle of thermal admissibility. The fourth chapter is dedicated to a general introduction to the theory of multiphase systems. The second part is focused on applications. The first chapter presents the main results of the theory of porous media which are used to build the models of composite materials discussed in the subsequent chapters. The second chapter is dedicated to the study of the inertial terms in a problem of infiltration of a resin in a reinforcement matrix during a pressure driven RTM process. As a consequence of the application of the pressure, the border in which the resin permeates starts to oscillate. A qualitative and quantitative study of the oscillations is given, proving that inertial terms influences the dynamics of the process only at the beginning and then their effects decay. Based on such an observation, the third chapter takes into account a system in which the inertia is completely neglected, focusing on the infiltration of a reactive resin into a solid preform. The mouldability diagram (which gives a window of applicability in the space of the process parameters) is presented and an analytic approximated expression for the infiltration velocity is give
Mathematical models for biomedicine
No full textSi tratta del libro di testo del corso di "Modelli Matematici per la Biomedicina" che il Prof. L. Preziosi e io teniamo al Politecnico di Torin
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