R. P. Croce

A Thermal Model for Pulsed EM Field Exposure Effects in Cells at Nonthermal Levels

The thermal response of an isolated cell under pulsed electric field exposure is studied, including a frequency-dependent membrane capacitance model. The possibility of a fast localized membrane heating up to physiologically significant levels is suggested, without sensible increase in the cytoplasmic temperature.

NONLINEAR INTERACTION OF ELECTROMAGNETIC RADIATION AT THE CELL MEMBRANE LEVEL: RESPONSE TO STOCHASTIC FIELDS

A general rigorous analytic framework for computing the transmembrane potential shift resulting from the nonlinear voltage- current membrane relationship in response to wideband stochastic electromagnetic radiation is outlined, based on Volterra functional series. The special case of an insulated cylindrical cell with Hodgkin- Huxley membrane in an inflnite homogeneous medium is worked out in detail, for the simplest case where the applied electric is normal to the cell axis, and independent from the axial coordinate. Representative computational results for a zero-average stationary band-limited white Gaussian incident fleld are illustrated and brie∞y discussed.

Optimum placement of post-1PN gravitational wave chirp templates made simple at any match level via Tanaka-Tagoshi coordinates

A simple recipe is given for constructing a maximally sparse regular lattice of spin-free post-1PN gravitational wave chirp templates subject to a given minimal match constraint, using Tanaka-Tagoshi coordinates.

Rejection properties of stochastic-resonance-based detectors of weak harmonic signals.

In [Phys. Rev. E 57, 6470 (1998)]] a thorough characterization in terms of receiver operating characteristics of stochastic-resonance detectors of weak harmonic signals of known frequency in additive Gaussian noise was given. It was shown that strobed sign-counting based strategies can be used to achieve a nice trade-off between performance and cost, by comparison with noncoherent correlators. Here we discuss the more realistic case where besides the sought signal (whose frequency is assumed known) further unwanted spectrally nearby signals with comparable amplitude are present. Rejection properties are discussed in terms of suitably defined false-alarm and false-dismissal probabilities for various values of interfering signal(s) strength and spectral separation.

Correlator bank detection of gravitational wave chirps—False-alarm probability, template density, and thresholds: Behind and beyond the minimal-match issue

The general problem of computing the false-alarm probability vs the detection-threshold relationship for a bank of correlators is addressed, in the context of maximum-likelihood detection of gravitational waves in additive stationary Gaussian noise. Specific reference is made to chirps from coalescing binary systems. Accurate (lower-bound) approximants for the cumulative distribution of the whole-bank supremum are deduced from a class of Bonferroni-type inequalities. The asymptotic properties of the cumulative distribution are obtained, in the limit where the number of correlators goes to infinity. The validity of numerical simulations made on small-size banks is extended to banks of any size, via a Gaussian-correlation inequality. The result is used to readdress the problem of relating the template density to the fraction of potentially observable sources which could be dismissed as an effect of template space discreteness.

Membrane heating in living tissues exposed to nonthermal pulsed em fields

A biotissue model consisting of multilayer spherical cells, including four nested radial domains (nucleus, nuclear membrane, cytoplasm, and plasma membrane), is worked out to derive the cell heating dynamics in presence of membrane capacitance dispersion under pulsed electromagnetic exposure. Two possible cases of frequency-dependent membrana models are discussed; plasma and nuclear membranes are dispersive, only the nuclear membrane is dispersive. In both models, a high localized heating of the membranes occurs, without significant temperature rise in the cytoplasm and nucleoplasm.

Robust gravitational wave burst detection and source localization in a network of interferometers using cross-Wigner spectra

We discuss a fast cross-Wigner transform based technique for detecting gravitational wave bursts, and estimating the direction of arrival, using a network of (three) non co-located interferometric detectors. The performances of the detector as a function of signal strength and source location, and the accuracy of the direction of arrival estimation are investigated by numerical simulations.

Gravitational wave chirp search: no-signal cumulative distribution of the maximum likelihood detection statistic

The cumulative distribution of the supremum of a set (bank) of correlators is investigated in the context of maximum likelihood detection of gravitational wave chirps from coalescing binaries with unknown parameters. Accurate (lower-bound) approximants are introduced based on a suitable generalization of previous results by Mohanty. Asymptotic properties (in the limit where the number of correlators goes to infinity) are highlighted. The validity of numerical simulations made on small-size banks is extended to banks of any size, via a Gaussian correlation inequality.

Tanaka-Tagoshi parametrization of post-first-post-Newtonian spin-free gravitational wave chirps: Equispaced and cardinal interpolated lattices for first generation interferometric antennas

The spin-free binary-inspiral parameter-space introduced by Tanaka and Tagoshi to construct a uniformly-spaced lattice of templates at (and possibly beyond)

Gravitational wave chirp search: Economization of post-Newtonian matched filter bank via cardinal interpolation

2.5PN