Menopausa, osteoporosi, diagnosi integrata complementare: review della letteratura

La menopausa, dovuta alla definitiva cessazione dei cicli mestruali derivante dalla perdita della funzione ovarica, è caratterizzata da un’intensa sintomatologia riguardante una vasta serie di funzioni a carattere metabolico, psicologico, sessuale. Abbiamo concentrato la nostra attenzione sul ruolo della carenza estrogenica nell’eziopatogenesi dell’osteoporosi post-menopausale, rilevando come la perdita di massa ossea, poiché interessa principalmente il tessuto trabecolare, influenza direttamente la densità e la resistenza dell’osso. Nella valutazione della BMD (Body Mass Density), abbiamo utilizzato sia la DXA (densitometria ossea a doppio raggio X) (sul tratto lombosacrale), ritenuta il gold standard nella diagnosi di osteoporosi, sia la densitometria ossea ultrasonografica (a livello del calcagno), tecnica meno costosa, più veloce e totalmente priva di rischi, che ha dimostrato precisione ed affidabilità comparabili alle metodiche che utilizzano radiazioni ionizzanti

Electromagnetic radiation from moving fractal sources: A plane-wave spectral approach

In this work the solution to the problem of electromagnetic radiation from (pre-) fractal antennas is performed by means of Plane-Wave field representation based on closed-form Fourier transforms of the self-similar current patterns. The generalization to the case of uniformly translating antennas is then accomplished through the Frame-Hopping Method by exploiting special-relativistic covariance properties of Plane-Wave spectra

Circuit models for Sierpinski gasket antennas

A lumped-parameter impedor-oriented and a 2-port-network-oriented circuit models for the Sierpinski gasket prefractal antenna are presented. With the former, the voltage and current patterns give a detailed understanding of the electromagnetic fields' self-similar distribution throughout the antenna geometry; on the other hand model complexity exponentially increases with the prefractal iteration order. The latter "black-box" model only controls port-oriented global parameters which are the ones commonly used in antennas' circuit models and its complexity is independent of prefractal order. The "black-box" model is also shown to converge, at fractal limit, to a reciprocal triangular network.Comment: [10 pages, 9 figures] Authors are with the Electronic Engineering Department, "La Sapienza" University of Rome, Italy, at http://www.die.uniroma1.it/strutture/labcem

On models of fractal networks

A couple of iterative models for the theoretical study of fractal networks whose topologies are generated via iterated function systems is presented: a lumped-parameter impedor-oriented one and a two-portnetwork- oriented one. With the former, the voltage and current patterns give a detailed understanding of the electromagnetic fields’ self-similar distribution throughout the network; on the other hand, model complexity exponentially increases with the prefractal iteration order. The latter ‘black-box’ model only controls port-oriented global parameters that are the ones commonly used in the integration of different electronic systems, and its complexity is independent of prefractal order. Sierpinski gasket and carpet topologies are reported as examples

Necrosis evolution during high-temperature hyperthermia through implanted heat sources

A nonstationary model for high-temperature hyperthermic treatments is developed. The aim of this model is to describe the thermal propagation within a living tissue and to quantify its clinical effects as it regards the physiological status (necrosis) of a neoplastic body. Particular attention is turned to the description of the necrotic transition induced by heating. This leads to the introduction of a necrosis field and to an effective-medium approximation for the corresponding physiological status (vascularization, necrosis, etc.) of the exposed tissue. The resulting nonlinear, nonstationary model is applied to a multilayered spherical structure with a temperature-regulated implant, and to a clinical case of a solid liver tumor. Clinical data on the spatial extent of the necrotized region are in good agreement with model predictions