1,721,125 research outputs found
Christopher A. FARAONE, Ancient Greek Love Magic.
No full textPhillips Richard. Christopher A. FARAONE, Ancient Greek Love Magic.. In: L'antiquité classique, Tome 72, 2003. pp. 476-478
Transient emission from microstrip interconnects: Theoretical formulation and CAD modeling
No full textA hybrid technique suitable for the space-time analysis of the transient spurious emission from microstrip interconnects is presented. The proposed technique requires the preliminary evaluation of the surface current excited on the microstrip interconnecting lines by means of a transmission line model accounting for dispersive effects, The radiated field is then computed in the frequency domain by applying the saddle-point asymptotic technique to the integral expression of the electric field involving the dyadic Green's function. The transient signals excited along the interconnects, and the corresponding radiated field, are finally determined by using the IFFT. Radiation mechanisms are investigated, and the influence of the structure's electrical and geometrical parameters is discussed
On the optical behavior of the electromagnetic field excited by a semi-infinite electric traveling-wave current
No full textA closed-form solution for the spatial distribution of the electromagnetic field excited by an electric traveling-wave current source is presented. Incomplete Hankel and modified Bessel functions are employed to represent progressive and evanescent wave fields, respectively. It is shown that these fields are expressed in. terms of spherical and cylindrical waves exhibiting optical character. Using the properties of the incomplete Hankel and modified Bessel functions, the spatial regions where the fields exist in optical sense are determined. It is shown that different shadow boundaries (SBs), featuring complex shapes, identify discontinuity surfaces for the geometrical optics (GO) field. Three surfaces, one being the well-know Keller's cone, are found to describe in the general case the SBs for both the progressive and the evanescent wave fields. It is demonstrated that these surfaces collapse to the Keller's cone surface in the limit of beta -> infinity
Dyadic Green’s Function for Planar Anisotropic Uniaxial Substrates: Theory and Applications
No full textA full-wave radiation model for a class of gridded ground interconnecting structures
No full textA-full-wave model based on the spectral domain approach (SDA) has been developed to predict, under realistic exciting/loading condition, the radiation characteristics of planar interconnecting lines printed on a dielectric slab backed by a gridded ground plane. The radiated held level is computed through an asymptotic evaluation of the corresponding radiation integral. A class of gridded ground interconnecting structures is analyzed and spurious radiation effects due to the finite size of the full/gridded ground are pointed out
Numerical analysis of the "ferris wheel" mice exposure system using an efficient cylindrical FDTD scheme
No full textThe objective of this study is to develop a numerical tool for characterizing the "ferris wheel" exposure system employed in a long-term study of RF exposure on mice. The "ferris wheel" is a radial cavity loaded with forty mice around its perimeter. In order to exploit the angular periodicity of the radial exposure system, we developed a Finite Difference in Time Domain (FDTD) code based on a cylindrical grid to analyze a single angular sector of the 40-mouse "ferris wheel". The singularity of the Maxwell equations in the cylindrical FDTD scheme was appropriately removed, and other suitable expedients were implemented to reduce simulation time and memory requirements. In order to estimate RF leakage, the actual openings in the radial cavity, needed to insert the mice, were considered as well. The FDTD scheme incorporates the perfectly matched layer (PML) unsplit formulation (anisotropic medium), as absorbing boundary condition. The code was validated with measurements, showing good agreement. A criterion for assessing the uniformity of the exposure is presented, together with results at 900 MHz and 1.8 GHz
Un Urban Center per L'Aquila
No full textL’Urban Center proposto dall’INU in collaborazione con l’Osservatorio di ricerca sugli Urban Center e della sua rete, è incardinato sull’opportunità dell’esercizio dei principi di democrazia partecipativa e deliberativa nei processi di coagulazione del consenso e di maturazione del quadro decisionale. Nell’attuale condizione della Comunità aquilana, risulta ineludibile non soltanto trovare canali preferenziali per informare la cittadinanza di linee strategiche, piani programmi e progetti che le istituzioni e le autorità preposte dovranno mettere in campo, ma allo stesso modo rispondere alle legittime aspirazioni della comunità aquilana
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