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| 20120132731 | METHOD AND SYSTEM FOR REUSING MATERIALS AND/OR PRODUCTS BY PULSED POWER - The invention relates to a method for reusing materials and/or products by pulsed power according to which a series of electrical discharges are generated between at least two electrodes in a reactor containing an ambient liquid as well as the materials and/or products to be reused, characterised in that the energy of said electric discharges, the voltage between the electrodes, the switching time and the frequency of the discharges are selected such that said discharges generate electric arcs that pass through the materials and/or products to be reused, and mechanical shock waves that propagate across the materials and/or products to be treated in the reactor. The result is fragmentation, pulverisation, dispersion and separation of the elements that make up the materials and/or products to be reused. The invention also relates to it device for implementing said method. | 05-31-2012 |
| 20120132732 | METHOD AND SYSTEM FOR REUSING MATERIALS AND/OR PRODUCTS BY PULSED POWER - The invention relates to a method for reusing materials and/or products according to which, in a first step, a series of electrical discharges are generated between at least two electrodes in a reactor containing an ambient liquid as well as the materials and/or products to be reused, in which the series of said electric discharges produces, due to the energy, the frequency of the electric discharges as well as the voltage between the electrodes and the switching time, a mechanical shock wave which propagates across the materials and/or products to be treated in the reactor, characterised in that after a first step of embrittlement by the mechanical shock wave thus produced, the products and/or materials are exposed to a series of electric discharges in which the energy, the voltage between the electrodes that generate said discharges, the switching time and the frequency of the discharges are selected so that said discharges perform selective fragmentation of the material by the effect of an electromagnetic field. The invention also relates to a device for implementing said method. | 05-31-2012 |
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| 20090067521 | BLIND ESTIMATION METHOD OF OFDM MODULATION PARATMETERS - The present invention concerns a blind estimation method of at least one temporal modulation parameter of an OFDM signal, in which a plurality of demodulation attempts of said OFDM signal are carried out using a plurality of respective values of this temporal parameter and, for each demodulation attempt, a cost function representative of the entropy of the demodulated signal is calculated, the estimate of said temporal parameter then being obtained as the value of this parameter minimising said cost function. | 03-12-2009 |
| 20110293026 | METHOD FOR THE BLIND ESTIMATION OF OFDM MODULATION PARAMETERS ACCORDING TO A MAXIMUM LIKELIHOOD CRITERION - The present invention relates to a method for blind estimation of at least one parameter of an OFDM signal according to a maximum likelihood (ML) criterion. In one embodiment, the estimation method uses a deterministic maximum likelihood criterion. In another embodiment, the estimation method assumes that the modulation symbols modulating the sub-carriers of the OFDM multiplex are i.i.d. and Gaussian random variables. The estimation of said parameter is carried out while minimizing a cost function depending on the chosen criterion. | 12-01-2011 |
| 20110305302 | METHOD FOR THE BLIND ESTIMATION OF OFDM SIGNAL PARAMETERS BY ADAPTED FILTERING - The present invention relates to a method for the blind estimation of at least one parameter of an OFDM signal by maximizing an objective function depending on said parameter. The objective function implements a parameterized model of the OFDM modulation and a matched filtering corresponding to that model. The OFDM signal, baseband demodulated and then sampled in an observation window, is the object of the adapted filtering to calculate the objective function. | 12-15-2011 |
| 20120128086 | IDENTIFICATION METHOD OF AN OFDM SIGNAL - An OFDM signal identification method in a received signal, wherein the received signal is sampled and cut off into blocks of P samples, each block being subjected to an inverse Fourier transform to obtain a plurality of symbols at a plurality of frequencies. For each frequency of the plurality, the kurtosis of the set of symbols thus obtained at this frequency is calculated, and then it is determined whether the kurtosis has a periodicity in frequency domain from kurtosis values calculated for the frequencies of the plurality, and the presence of an OFDM signal in the received signal is identified if the kurtosis has such a periodicity. | 05-24-2012 |
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| 20080310585 | DETECTOR ARRAY AND SYSTEM - In some embodiments, an optical mask for a CT detector is disclosed. In some embodiments, the mask is intercalated between a photodiode array and a scintillator array forming the CT detector. In some embodiments, the optical mask may extend along one or more axes and differentially absorbs and/or reflects light emitted from the scintillators at edges of photodiodes forming the diode array, with less absorption or reflection at edges of tiled die forming the diode array than in central portions of each of the die. Through selective absorption and/or reflection, transference of light photons from a scintillator to the photodiode corresponding to a neighboring scintillator is spatially modified, at least partially compensating for spatial differences in crosstalk signals between adjacent pairs of photodiode/scintillator cell elements. This reduction in differential crosstalk reduces artifacts in a reconstructing data descriptive of internal portions of a subject, which improves diagnostic value of the data. | 12-18-2008 |
| 20110091009 | X-RAY DETECTOR METHODS AND APPARATUS - A method includes performing an x-ray focal spot deflection to generate two complete projections from two different channels of an x-ray detector, wherein the channels are purposefully different from each other in some respect other than being different channels. | 04-21-2011 |
| 20110150174 | MULTIPLE X-RAY TUBE SYSTEM AND METHOD OF MAKING SAME - An imaging system includes a rotatable gantry having an opening therein to receive a subject to be scanned and configured to rotate about a central axis in a rotation direction. The imaging system also includes a first x-ray source coupled to the rotatable gantry at a first position, wherein the first position is offset from the central axis of the rotatable gantry by a first distance. Further, the imaging system includes a second x-ray source coupled to the rotatable gantry at a second position, wherein the second position is offset from the central axis of the rotatable gantry by a second distance, wherein the second position is offset from the first position in a direction coincident with the rotation direction, and wherein the second position is offset from the first position in a direction parallel to the central axis. | 06-23-2011 |
| 20110211667 | DE-POPULATED DETECTOR FOR COMPUTED TOMOGRAPHY AND METHOD OF MAKING SAME - A system, method, and apparatus includes a computed tomography (CT) detector array having a central region with a plurality of central region detecting cells configured to acquire CT data of a first number of slices during a scan, a first wing along a first side of the central region, and a second wing along a second side of the central region opposite the first side. The first wing includes a plurality of first wing detecting cells configured to acquire CT data of a second number of slices during the scan. The second wing includes a plurality of second wing detecting cells configured to acquire CT data of a third number of slices during the scan. The second and third number of slices are less than the first number of slices. The first wing detecting cells are of a different type than the central region detecting cells. | 09-01-2011 |
| 20120014502 | ASYMMETRIC DE-POPULATED DETECTOR FOR COMPUTED TOMOGRAPHY AND METHOD OF MAKING SAME - A computed tomography (CT) detector array includes a central region substantially symmetric about a central axis thereof and includes a first plurality of x-ray detector cells configured to acquire CT data from a first number of detector rows during a scan, wherein the central axis is in a channel direction of the CT detector array and transverse to a slice direction of the CT detector array. A first wing is coupled to a first side of the central region, and a second wing is coupled to a second side of the central region opposite the first side. The first and second wings include respective second and third pluralities of x-ray detector cells and are each configured to acquire CT data from a number of detector rows that is less than the first number of detector rows. The CT detector array is asymmetric about the central axis of the central region. | 01-19-2012 |
| 20120087462 | HYBRID COLLIMATOR FOR X-RAYS AND METHOD OF MAKING SAME - An x-ray collimator comprises a first plurality of x-ray attenuation plates having a width and a length, the length extending along a first direction, wherein the plates of the first plurality of x-ray attenuation plates are spaced apart from one another along a second direction. The collimator comprises a second plurality of x-ray attenuation plates having a width and a length, the length extending along the second direction, wherein the plates of the second plurality of x-ray attenuation plates are spaced apart from one another along the first direction and wherein the plates of the second plurality of x-ray attenuation plates extend through the plates of the first plurality of x-ray attenuation plates. The first and second directions are orthogonal, and the width of the plates of the first plurality of x-ray attenuation plates is greater than the width of the plates of the second plurality of x-ray attenuation plates. | 04-12-2012 |
| 20120087465 | MULTI-FACETED TILEABLE DETECTOR FOR VOLUMETRIC COMPUTED TOMOGRAPHY IMAGING - A system and method for CT image acquisition with increased slice acquisition and minimal image data degradation is provided. The system includes an x-ray projection source positioned that projects a cone beam of x-rays from a focal spot of the x-ray projection source toward an object and a plurality of detector modules positioned on the rotatable gantry to receive x-rays attenuated by the object. Each of the detector modules includes a module frame having a top surface that includes a plurality of facets formed thereon constructed so as to be oriented at differing angles relative to the focal spot and a plurality of sub-modules positioned on the plurality of facets to receive the x-rays attenuated by the object and to convert the x-rays to electrical signals, with each sub-module being oriented at an angle relative to the focal spot based on a respective facet on which the sub-module is mounted. | 04-12-2012 |
