86,596 research outputs found
Low cost thermopile detectors for THz imaging and sensing
No full textWe evaluate 2 thermopile sensors as convenient detector options for a modern integrated THz imaging system. Both a commercial single pixel device and a 32 times 32 pixel FPA are utilized in a simple setup with a single optical element to achieve an outstanding resolution and SNR performance. Either a cryogenically cooled quantum cascade laser (QCL) or a room temperature electronic THz multiplier chain is used as source
A 3-D PEEC Formulation Based on the Cell Method for Full-Wave Analyses With Conductive, Dielectric, and Magnetic Media
No full textA novel partial element equivalent circuit (PEEC) formulation for solving full-Maxwell’s equations, with piecewise homogeneous
and linear conductive, dielectric, and magnetic media, is presented. It is based on the cell method which by using integral variables
as problem unknowns is naturally suited for developing circuit-like approaches such as PEEC. Volume meshing allows complex
3-D geometries, with electric and magnetic materials, to be discretized. Electromagnetic couplings in the air domain are modeled
by integral equations
Marching on-in-time unstructured PEEC method for electrically large structures with conductive, dielectric, and magnetic media
No full textThe Marching On-In-Time (MOT) unstructured Partial Element Equivalent Circuit (PEEC) method for time domain electromagnetic problems is presented. The method allows the transient analysis of electrically large electromagnetic devices consisting of conductive, dielectric, and magnetic media coupled with external lumped circuits. By re-formulating PEEC following the Coulombian interpretation of magnetization phenomena and by using electric and magnetic vector potentials, the proposed approach allows for a completely equivalent treatment of electric and magnetic media and inhomogeneous and anisotropic materials are accounted for as well. With respect to the recently proposed Marching On-In-Time PEEC approach, based on the standard (structured) discretization of PEEC, the method presented in this paper uses a different space and time MOT discretization, which allows for a reduction in the number of the unknowns. Analytical and industrial test cases consisting in electrically large devices are considered (e.g., the model of a Neutral Beam Injector adopted in thermonuclear fusion applications). Results obtained from the simulations show that the proposed method is accurate and yields good performances. Moreover, when rich harmonic content transient phenomena are considered, the unstructured MOT–PEEC method allows for a significant reduction of the memory and computation time when compared to techniques based on Inverse Discrete Fourier Transform applied to the frequency domain unstructured PEEC approach
L'aborto ricorrente. Osservazioni sulla casistica della Clinica Ostetrica e Ginecologica dell'Università di Genova (1974-1983).
No full textA DC to HF Volume PEEC Formulation Based on Hertz Potentials and the Cell Method
No full textA new Partial Element Equivalent Circuit formulation based on Hertz potentials and the Cell Method is presented. Conductive, dielectric, and magnetic linear-homogeneous media
are considered by means of conduction, polarization, and magnetization current densities. The use of edge unknowns leads to reduce system size with respect to typical face-based approaches
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