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24 results on '"Fraser, George W."'

4. XIPE: the X-ray imaging polarimetry explorer

Author

Soffitta, Paolo, Barcons, Xavier, Bellazzini, Ronaldo, Braga, João, Costa, Enrico, Fraser, George W., Gburek, Szymon, Huovelin, Juhani, Matt, Giorgio, Pearce, Mark, Poutanen, Juri, Reglero, Victor, Santangelo, Andrea, Sunyaev, Rashid A., Tagliaferri, Gianpiero, Weisskopf, Martin, Aloisio, Roberto, Amato, Elena, Attiná, Primo, Axelsson, Magnus, Baldini, Luca, Basso, Stefano, Bianchi, Stefano, Blasi, Pasquale, Bregeon, Johan, Brez, Alessandro, Bucciantini, Niccoló, Burderi, Luciano, Burwitz, Vadim, Casella, Piergiorgio, Churazov, Eugene, Civitani, Marta, Covino, Stefano, Curado da Silva, Rui Miguel, Cusumano, Giancarlo, Dadina, Mauro, D’Amico, Flavio, Rosa, Alessandra De, Cosimo, Sergio Di, Persio, Giuseppe Di, Salvo, Tiziana Di, Dovciak, Michal, Elsner, Ronald, Eyles, Chris J., Fabian, Andrew C., Fabiani, Sergio, Feng, Hua, Giarrusso, Salvatore, Goosmann, René W., Grandi, Paola, Grosso, Nicolas, Israel, Gianluca, Jackson, Miranda, Kaaret, Philip, Karas, Vladimir, Kuss, Michael, Lai, Dong, Rosa, Giovanni La, Larsson, Josefin, Larsson, Stefan, Latronico, Luca, Maggio, Antonio, Maia, Jorge, Marin, Frédéric, Massai, Marco Maria, Mineo, Teresa, Minuti, Massimo, Moretti, Elena, Muleri, Fabio, O’Dell, Stephen L., Pareschi, Giovanni, Peres, Giovanni, Pesce, Melissa, Petrucci, Pierre-Olivier, Pinchera, Michele, Porquet, Delphine, Ramsey, Brian, Rea, Nanda, Reale, Fabio, Rodrigo, Juana Maria, Różańska, Agata, Rubini, Alda, Rudawy, Pawel, Ryde, Felix, Salvati, Marco, de Santiago, Jr., Valdivino Alexandre, Sazonov, Sergey, Sgró, Carmelo, Silver, Eric, Spandre, Gloria, Spiga, Daniele, Stella, Luigi, Tamagawa, Toru, Tamborra, Francesco, Tavecchio, Fabrizio, Dias, Teresa Teixeira, Adelsberg, Matthew van, Wu, Kinwah, and Zane, Silvia

Published
2013
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5. AXIOM: advanced X-ray imaging of the magnetosphere

Author

Branduardi-Raymont, Graziella, Sembay, Steve F., Eastwood, Jonathan P., Sibeck, David G., Abbey, Tony A., Brown, Patrick, Carter, Jenny A., Carr, Chris M., Forsyth, Colin, Kataria, Dhiren, Kemble, Steve, Milan, Steve E., Owen, Chris J., Peacocke, Lisa, Read, Andy M., Coates, Andrew J., Collier, Michael R., Cowley, Stan W. H., Fazakerley, Andrew N., Fraser, George W., Jones, Geraint H., Lallement, Rosine, Lester, Mark, Porter, F. Scott, and Yeoman, Tim K.

Published
2012
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13. Recording from the same neurons chronically in motor cortex.

Author

Fraser, George W. and Schwartz, Andrew B.

Abstract

Two rhesus monkeys were implanted with silicon arrays of 96 microelectrodes. Neural activity was recorded periodically over a period of weeks to months. We have developed a method to determine whether single units in two separate recording sessions represent the same neuron. Pairwise cross-correlograms, the autocorrelogram, waveform shape, and mean firing rate were used together as identifying features of a neuron. When two units recorded on separate days were compared using these features, their similarity scores tended to be either high, indicating two recordings from the same neuron, or low, indicating different neurons. Although these metrics are individually weak, together they produce a strong classifier. Some neurons were recorded for 100 days. These monkeys performed a center-out reaching task, and we found that the firing properties of chronically recorded neurons were stable over time. [ABSTRACT FROM AUTHOR]

Published
2012
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23. Investigation of Scintillator Coated CCDs for Medical Imaging.

Author

Lees, John E., Bassford, David, Fraser, George W., Monk, David, Early, Michael, Ott, Robert J., Moody, Ian, Blackshaw, Elaine, and Perkins, Alan C.

Subjects
MEDICAL imaging systems, DIAGNOSTIC imaging, DIGITAL cameras, EINSTEIN-Podolsky-Rosen experiment, PHOTONS, SCIENTIFIC apparatus & instruments, ENGINEERING instruments, RADIONUCLIDE imaging, RADIOISOTOPES
Abstract

We describe the development of a scintillator-coated charge coupled device (CCD) based camera for imaging small volumes of radionuclide uptake in tissues. The high-resolution gamma imager (HRGI) is a collimated, scintillator-coated, low cost, imager using low noise CCDs. The HRGI operates in photon counting mode using a peltier cooler to achieve an operating temperature of -5° C. We have measured the spatial resolution and efficiency of a prototype CCD from e2v Technologies Ltd coated with a 500-µm-thick Gadox (Gd2O2S(Tb)) layer using 59.5 keV radiation from a 241Am source and 140 keV gamma-rays from a 99 mTc source. We also describe our first images using 99 mTc phantoms. [ABSTRACT FROM AUTHOR]

Published
2006
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