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19 results on '"Westphal, Andrew J."'

1. Automatic detection of impact craters on Al foils from the Stardust interstellar dust collector using convolutional neural networks

Author

Jaeger, Logan, primary, Butterworth, Anna L., additional, Gainsforth, Zack, additional, Lettieri, Robert, additional, Zevin, Dan, additional, Ardizzone, Augusto, additional, Capraro, Michael, additional, Burchell, Mark, additional, Wozniakiewicz, Penny, additional, Ogliore, Ryan C., additional, De Gregorio, Bradley T., additional, Stroud, Rhonda M., additional, Westphal, Andrew J., additional, and Brownlee, Donald, additional

Published
2021
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2. Automatic detection of impact craters on Al foils from the Stardust interstellar dust collector using convolutional neural networks

Author

Jaeger, Logan, Butterworth, Anna L., Gainsforth, Zack, Lettieri, Robert, Zevin, Daniel, Ardizzone, Augusto, Capraro, Michael, Burchell, Mark J., Wozniakiewicz, Penelope J., Ogliore, Ryan, De Gregorio, Bradley T., Stroud, Rhonda M., Westphal, Andrew J., Jaeger, Logan, Butterworth, Anna L., Gainsforth, Zack, Lettieri, Robert, Zevin, Daniel, Ardizzone, Augusto, Capraro, Michael, Burchell, Mark J., Wozniakiewicz, Penelope J., Ogliore, Ryan, De Gregorio, Bradley T., Stroud, Rhonda M., and Westphal, Andrew J.

Abstract

NASA’s Stardust mission utilized a sample collector composed of aerogel and aluminum foil to return cometary and interstellar particles to Earth. Analysis of the aluminum foil begins with locating craters produced by hypervelocity impacts of cometary and interstellar dust. Interstellar dust craters are typically less than one micrometer in size and are sparsely distributed, making them difficult to find. In this paper, we describe a convolutional neural network based on the VGG16 architecture that achieves high specificity and sensitivity in locating impact craters in the Stardust interstellar collector foils. We evaluate its implications for current and future analyses of Stardust samples

Published
2021

7. Stardust Interstellar Preliminary Examination I: Identification of tracks in aerogel

Author

Westphal, Andrew J., primary, Anderson, David, additional, Butterworth, Anna L., additional, Frank, David R., additional, Lettieri, Robert, additional, Marchant, William, additional, Von Korff, Joshua, additional, Zevin, Daniel, additional, Ardizzone, Augusto, additional, Campanile, Antonella, additional, Capraro, Michael, additional, Courtney, Kevin, additional, Criswell, Mitchell N., additional, Crumpler, Dixon, additional, Cwik, Robert, additional, Gray, Fred Jacob, additional, Hudson, Bruce, additional, Imada, Guy, additional, Karr, Joel, additional, Wah, Lily Lau Wan, additional, Mazzucato, Michele, additional, Motta, Pier Giorgio, additional, Rigamonti, Carlo, additional, Spencer, Ronald C., additional, Woodrough, Stephens B., additional, Santoni, Irene Cimmino, additional, Sperry, Gerry, additional, Terry, Jean‐Noel, additional, Wordsworth, Naomi, additional, Yahnke, Tom, additional, Allen, Carlton, additional, Ansari, Asna, additional, Bajt, Saša, additional, Bastien, Ron K., additional, Bassim, Nabil, additional, Bechtel, Hans A., additional, Borg, Janet, additional, Brenker, Frank E., additional, Bridges, John, additional, Brownlee, Donald E., additional, Burchell, Mark, additional, Burghammer, Manfred, additional, Changela, Hitesh, additional, Cloetens, Peter, additional, Davis, Andrew M., additional, Doll, Ryan, additional, Floss, Christine, additional, Flynn, George, additional, Gainsforth, Zack, additional, Grün, Eberhard, additional, Heck, Philipp R., additional, Hillier, Jon K., additional, Hoppe, Peter, additional, Huth, Joachim, additional, Hvide, Brit, additional, Kearsley, Anton, additional, King, Ashley J., additional, Lai, Barry, additional, Leitner, Jan, additional, Lemelle, Laurence, additional, Leroux, Hugues, additional, Leonard, Ariel, additional, Nittler, Larry R., additional, Ogliore, Ryan, additional, Ong, Wei Ja, additional, Postberg, Frank, additional, Price, Mark C., additional, Sandford, Scott A., additional, Tresseras, Juan‐Angel Sans, additional, Schmitz, Sylvia, additional, Schoonjans, Tom, additional, Silversmit, Geert, additional, Simionovici, Alexandre S., additional, Solé, Vicente A., additional, Srama, Ralf, additional, Stephan, Thomas, additional, Sterken, Veerle J., additional, Stodolna, Julien, additional, Stroud, Rhonda M., additional, Sutton, Steven, additional, Trieloff, Mario, additional, Tsou, Peter, additional, Tsuchiyama, Akira, additional, Tyliszczak, Tolek, additional, Vekemans, Bart, additional, Vincze, Laszlo, additional, and Zolensky, Michael E., additional

Published
2014
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8. Stardust Interstellar Preliminary Examination XI: Identification and elemental analysis of impact craters on Al foils from the Stardust Interstellar Dust Collector

Author

Stroud, Rhonda M., primary, Allen, Carlton, additional, Ansari, Asna, additional, Anderson, David, additional, Bajt, Saša, additional, Bassim, Nabil, additional, Bastien, Ron S., additional, Bechtel, Hans A., additional, Borg, Janet, additional, Brenker, Frank E., additional, Bridges, John, additional, Brownlee, Donald E., additional, Burchell, Mark, additional, Burghammer, Manfred, additional, Butterworth, Anna L., additional, Changela, Hitesh, additional, Cloetens, Peter, additional, Davis, Andrew M., additional, Doll, Ryan, additional, Floss, Christine, additional, Flynn, George, additional, Frank, David R., additional, Gainsforth, Zack, additional, Grün, Eberhard, additional, Heck, Philipp R., additional, Hillier, Jon K., additional, Hoppe, Peter, additional, Huth, Joachim, additional, Hvide, Brit, additional, Kearsley, Anton, additional, King, Ashley J., additional, Kotula, Paul, additional, Lai, Barry, additional, Leitner, Jan, additional, Lemelle, Laurence, additional, Leroux, Hugues, additional, Leonard, Ariel, additional, Lettieri, Robert, additional, Marchant, William, additional, Nittler, Larry R., additional, Ogliore, Ryan, additional, Ong, Wei Jia, additional, Postberg, Frank, additional, Price, Mark C., additional, Sandford, Scott A., additional, Tresseras, Juan‐Angel Sans, additional, Schmitz, Sylvia, additional, Schoonjans, Tom, additional, Schreiber, Kate, additional, Silversmit, Geert, additional, Simionovici, Alexandre S., additional, Solé, Vicente A., additional, Srama, Ralf, additional, Stephan, Thomas, additional, Sterken, Veerle J., additional, Stodolna, Julien, additional, Sutton, Steven, additional, Trieloff, Mario, additional, Tsou, Peter, additional, Tsuchiyama, Akira, additional, Tyliszczak, Tolek, additional, Vekemans, Bart, additional, Vincze, Laszlo, additional, Westphal, Andrew J., additional, Von Korff, Joshua, additional, Zevin, Daniel, additional, and Zolensky, Michael E., additional

Published
2013
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12. Discovery of non-random spatial distribution of impacts in the Stardust cometary collector

Author

Westphal, Andrew J., primary, Bastien, Ronald K., additional, Borg, Janet, additional, Bridges, John, additional, Brownlee, Donald E., additional, Burchell, Mark J., additional, Cheng, Andrew F., additional, Clark, Benton C., additional, Djouadi, Zahia, additional, Floss, Christine, additional, Franchi, Ian, additional, Gainsforth, Zack, additional, Graham, Giles, additional, Green, Simon F., additional, Heck, Philipp R., additional, HorÁNYI, Mihaly, additional, Hoppe, Peter, additional, Hörz, Friedrich P., additional, Huth, Joachim, additional, Kearsley, Anton, additional, Leroux, Hugues, additional, Marhas, Kuljeet, additional, Nakamura-Messenger, Keiko, additional, Sandford, Scott A., additional, See, Thomas H., additional, Stadermann, Frank J., additional, Teslich, Nick E., additional, Tsitrin, Samuel, additional, Warren, Jack L., additional, Wozniakiewicz, Penelope J., additional, and Zolensky, Michael E., additional

Published
2008
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13. TOF-SIMS analysis of cometary matter in Stardust aerogel tracks

Author

Stephan, Thomas, primary, Rost, Detlef, additional, Vicenzi, Edward P., additional, Bullock, Emma S., additional, MacPherson, Glenn J., additional, Westphal, Andrew J., additional, Snead, Christopher J., additional, Flynn, George J., additional, Sandford, Scott A., additional, and Zolensky, Michael E., additional

Published
2008
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14. Quantitative organic and light-element analysis of comet 81P/Wild 2 particles using C-, N-, and O-μ-XANES

Author

Cody, George D., primary, Ade, Harald, additional, Alexander, M. O'D., additional, Araki, Tohru, additional, Butterworth, Anna, additional, Fleckenstein, Holger, additional, Flynn, George, additional, Gilles, Mary K., additional, Jacobsen, Chris, additional, Kilcoyne, A. L. D., additional, Messenger, Keiko, additional, Sandford, Scott A., additional, Tyliszczak, Tolek, additional, Westphal, Andrew J., additional, Wirick, Susan, additional, and Yabuta, Hikaru, additional

Published
2008
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19. Shared and distinct contributions of rostrolateral prefrontal cortex to analogical reasoning and episodic memory retrieval.

Author

Westphal AJ, Reggente N, Ito KL, and Rissman J

Subjects
Adult, Brain Mapping, Cerebrovascular Circulation physiology, Cognition physiology, Female, Functional Laterality, Humans, Magnetic Resonance Imaging, Male, Multivariate Analysis, Neural Pathways physiology, Neuropsychological Tests, Oxygen blood, Perception physiology, Semantics, Thinking physiology, Young Adult, Memory, Episodic, Prefrontal Cortex physiology
Abstract

Rostrolateral prefrontal cortex (RLPFC) is widely appreciated to support higher cognitive functions, including analogical reasoning and episodic memory retrieval. However, these tasks have typically been studied in isolation, and thus it is unclear whether they involve common or distinct RLPFC mechanisms. Here, we introduce a novel functional magnetic resonance imaging (fMRI) task paradigm to compare brain activity during reasoning and memory tasks while holding bottom-up perceptual stimulation and response demands constant. Univariate analyses on fMRI data from twenty participants identified a large swath of left lateral prefrontal cortex, including RLPFC, that showed common engagement on reasoning trials with valid analogies and memory trials with accurately retrieved source details. Despite broadly overlapping recruitment, multi-voxel activity patterns within left RLPFC reliably differentiated these two trial types, highlighting the presence of at least partially distinct information processing modes. Functional connectivity analyses demonstrated that while left RLPFC showed consistent coupling with the fronto-parietal control network across tasks, its coupling with other cortical areas varied in a task-dependent manner. During the memory task, this region strengthened its connectivity with the default mode and memory retrieval networks, whereas during the reasoning task it coupled more strongly with a nearby left prefrontal region (BA 45) associated with semantic processing, as well as with a superior parietal region associated with visuospatial processing. Taken together, these data suggest a domain-general role for left RLPFC in monitoring and/or integrating task-relevant knowledge representations and showcase how its function cannot solely be attributed to episodic memory or analogical reasoning computations., (© 2015 Wiley Periodicals, Inc.)

Published
2016
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