567 research outputs found
Dual-PEEC Modeling of a Two-Port TEM Cell for VHF Applications
Two-port TEM cells with rectangular cross section are commonly used to produce plane electromagnetic waves with high electric field. The non-uniform structure makes the use of numerical methods extremely useful in the design phase in order to achieve a very good behavior of the TEM cell over a wide frequency range of operation. In this paper an extended version of PEEC is used to study a real device and results are compared with experimental ones
A Second-Order Cell Method for Poisson's Equation
The Cell Method, similar to the Finite Integration Technique, is a well-established numerical method for the solution
of field problems, however an often raised criticism is that it is limited to constant fields within elements. In this paper
we show that for the case of Poissonâs equation the Cell Method can be extended to the second order convergence.
Numerical results showing the order of convergence of the method are presented
A Source Identification Problem for the Electrical Activity of Brain During Hand Movement
A field source reconstruction of the dipoles modeling the activated area of the brain, while a subject performs the task of the voluntary motion of the hand, is solved. Experimental data resulting from fMRI are used for constraining the position of the equivalent dipole
Handling oversampling in dynamic networks using link prediction
Oversampling is a common characteristic of data representing dynamic
networks. It introduces noise into representations of dynamic networks, but
there has been little work so far to compensate for it. Oversampling can affect
the quality of many important algorithmic problems on dynamic networks,
including link prediction. Link prediction seeks to predict edges that will be
added to the network given previous snapshots. We show that not only does
oversampling affect the quality of link prediction, but that we can use link
prediction to recover from the effects of oversampling. We also introduce a
novel generative model of noise in dynamic networks that represents
oversampling. We demonstrate the results of our approach on both synthetic and
real-world data.Comment: ECML/PKDD 201
Short communication: Jenny milk as an inhibitor of late blowing in cheese: A preliminary report
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Especiação de selĂȘnio em amostra de sangue bovino: estudo envolvendo a separação e detecção por HPLC-UV-ICP OES.
Determinação de metais em amostras de sucos por ICP OES empregando reação foto-fenton no preparo da amostra.
Use of bremsstrahlung radiation to identify hidden weak beta- sources: feasibility and possible use in radio-guided surgery
The recent interest in beta- radionuclides for radio-guided surgery derives
from the feature of the beta radiation to release energy in few millimeters of
tissue. Such feature can be used to locate residual tumors with a probe located
in its immediate vicinity, determining the resection margins with an accuracy
of millimeters. The drawback of this technique is that it does not allow to
identify tumors hidden in more than few mm of tissue. Conversely, the
bremsstrahlung X-rays emitted by the interaction of the beta- radiation with
the nuclei of the tissue are relatively penetrating. To complement the beta-
probes, we have therefore developed a detector based on cadmium telluride, an
X-ray detector with a high quantum efficiency working at room temperature. We
measured the secondary emission of bremsstrahlung photons in a target of
Polymethylmethacrylate (PMMA) with a density similar to living tissue. The
results show that this device allows to detect a 1 ml residual or lymph-node
with an activity of 1 kBq hidden under a layer of 10 mm of PMMA with a 3:1
signal to noise, i.e. with a five sigma discrimination in less than 5 s
Uncertainty Quantification for SAE J2954 Compliant Static Wireless Charge Components
The present work aims at quantifying how, and how much, the uncertainties on the components and material parameters of a wireless power transfer (WPT) system for the static charge of electric vehicles affect the overall efficiency and functionality of the final produced device. With the aim of considering the perspective of a possible industrial developer, the parameters selected for the uncertainty quantification are chosen to be the capacitance values of the compensation capacitors and the electromagnetic material parameters used for the construction of the magnetic structure of a WPT system, i.e. the parameters of the elements to be purchased. The analysis is based on a standard system among the ones provided by the current SAE J2954 recommended practice
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