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Investigation of octupole vibrational states in ^{150}Nd via inelastic proton scattering (p,p^{′}γ) (2011)

M. Elvers, S. Pascu, T. Ahmed, T. Ahn, V. Anagnostatou, N. Cooper, C. Deng, J. Endres, P. Goddard, A. Heinz, G. Ilie, E. Jiang, C. Küppersbusch, D. Radeck, D. Savran, N. Shenkov, V. Werner, and A. Zilges

American Physical Society (APS)

In: Physical Review C

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Publikationsdatum: 2011-11-29

Beschreibung: Author(s): M. Elvers, S. Pascu, T. Ahmed, T. Ahn, V. Anagnostatou, N. Cooper, C. Deng, J. Endres, P. Goddard, A. Heinz, G. Ilie, E. Jiang, C. Küppersbusch, D. Radeck, D. Savran, N. Shenkov, V. Werner, and A. Zilges [Phys. Rev. C 84, 054323] Published Mon Nov 28, 2011

Schlagwort(e): Nuclear Structure

Print ISSN: 0556-2813

Digitale ISSN: 1089-490X

Thema: Physik

Publiziert von American Physical Society (APS)

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Toughening stretchable fibers via serial fracturing of a metallic core (2019)

Cooper, C. B., Joshipura, I. D., Parekh, D. P., Norkett, J., Mailen, R., Miller, V. M., Genzer, J., Dickey, M. D.

American Association for the Advancement of Science (AAAS)

In: Science Advances

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Publikationsdatum: 2019

Beschreibung: 〈p〉Tough, biological materials (e.g., collagen or titin) protect tissues from irreversible damage caused by external loads. Mimicking these protective properties is important in packaging and in emerging applications such as durable electronic skins and soft robotics. This paper reports the formation of tough, metamaterial-like core-shell fibers that maintain stress at the fracture strength of a metal throughout the strain of an elastomer. The shell experiences localized strain enhancements that cause the higher modulus core to fracture repeatedly, increasing the energy dissipated during extension. Normally, fractures are catastrophic. However, in this architecture, the fractures are localized to the core. In addition to dissipating energy, the metallic core provides electrical conductivity and enables repair of the fractured core for repeated use. The fibers are 2.5 times tougher than titin and hold more than 15,000 times their own weight for a period 100 times longer than a hollow elastomeric fiber.〈/p〉

Digitale ISSN: 2375-2548

Thema: Allgemeine Naturwissenschaft

Publiziert von American Association for the Advancement of Science (AAAS)

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Assessing bimanual motor skills with optical neuroimaging (2018)

Nemani, A., Yücel, M. A., Kruger, U., Gee, D. W., Cooper, C., Schwaitzberg, S. D., De, S., Intes, X.

American Association for the Advancement of Science (AAAS)

In: Science Advances

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Publikationsdatum: 2018

Beschreibung: 〈p〉Measuring motor skill proficiency is critical for the certification of highly skilled individuals in numerous fields. However, conventional measures use subjective metrics that often cannot distinguish between expertise levels. We present an advanced optical neuroimaging methodology that can objectively and successfully classify subjects with different expertise levels associated with bimanual motor dexterity. The methodology was tested by assessing laparoscopic surgery skills within the framework of the fundamentals of a laparoscopic surgery program, which is a prerequisite for certification in general surgery. We demonstrate that optical-based metrics outperformed current metrics for surgical certification in classifying subjects with varying surgical expertise. Moreover, we report that optical neuroimaging allows for the successful classification of subjects during the acquisition of these skills.〈/p〉

Digitale ISSN: 2375-2548

Thema: Allgemeine Naturwissenschaft

Publiziert von American Association for the Advancement of Science (AAAS)

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Entry-level spin distributions and relative $γ$-neutron branching ratios of samarium isotopes populated by the ($p,t$) reaction (2018)

N. Cooper, C. W. Beausang, P. Humby, A. Simon, J. T. Burke, R. O. Hughes, S. Ota, C. Reingold, A. Saastamoinen, and E. Wilson

American Physical Society (APS)

In: Physical Review C

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Publikationsdatum: 2018-10-25

Beschreibung: Author(s): N. Cooper, C. W. Beausang, P. Humby, A. Simon, J. T. Burke, R. O. Hughes, S. Ota, C. Reingold, A. Saastamoinen, and E. Wilson The spin distribution populated in the Sm 150 ( p , t ) reaction with 25 MeV protons has been investigated using the silicon telescope and high-purity germanium array Hyperion. Angular distributions of outgoing tritons and relative intensities of γ rays from low-lying levels are used to deduce the initial... [Phys. Rev. C 98, 044618] Published Wed Oct 24, 2018

Schlagwort(e): Nuclear Reactions

Print ISSN: 0556-2813

Digitale ISSN: 1089-490X

Thema: Physik

Publiziert von American Physical Society (APS)

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Newly recognized turbidity current structure can explain prolonged flushing of submarine canyons (2017)

Azpiroz-Zabala, M., Cartigny, M. J. B., Talling, P. J., Parsons, D. R., Sumner, E. J., Clare, M. A., Simmons, S. M., Cooper, C., Pope, E. L.

American Association for the Advancement of Science (AAAS)

In: Science Advances

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Publikationsdatum: 2017-10-05

Beschreibung: Seabed-hugging flows called turbidity currents are the volumetrically most important process transporting sediment across our planet and form its largest sediment accumulations. We seek to understand the internal structure and behavior of turbidity currents by reanalyzing the most detailed direct measurements yet of velocities and densities within oceanic turbidity currents, obtained from weeklong flows in the Congo Canyon. We provide a new model for turbidity current structure that can explain why these are far more prolonged than all previously monitored oceanic turbidity currents, which lasted for only hours or minutes at other locations. The observed Congo Canyon flows consist of a short-lived zone of fast and dense fluid at their front, which outruns the slower moving body of the flow. We propose that the sustained duration of these turbidity currents results from flow stretching and that this stretching is characteristic of mud-rich turbidity current systems. The lack of stretching in previously monitored flows is attributed to coarser sediment that settles out from the body more rapidly. These prolonged seafloor flows rival the discharge of the Congo River and carry ~2% of the terrestrial organic carbon buried globally in the oceans each year through a single submarine canyon. Thus, this new structure explains sustained flushing of globally important amounts of sediment, organic carbon, nutrients, and fresh water into the deep ocean.

Digitale ISSN: 2375-2548

Thema: Allgemeine Naturwissenschaft

Publiziert von American Association for the Advancement of Science (AAAS)

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Assessing bimanual motor skills with optical neuroimaging (2018)

Nemani, A., Yücel, M. A., Kruger, U., Gee, D. W., Cooper, C., Schwaitzberg, S. D., De, S., Intes, X.

American Association for the Advancement of Science (AAAS)

In: Science Advances

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Publikationsdatum: 2018-10-04

Beschreibung: Measuring motor skill proficiency is critical for the certification of highly skilled individuals in numerous fields. However, conventional measures use subjective metrics that often cannot distinguish between expertise levels. We present an advanced optical neuroimaging methodology that can objectively and successfully classify subjects with different expertise levels associated with bimanual motor dexterity. The methodology was tested by assessing laparoscopic surgery skills within the framework of the fundamentals of a laparoscopic surgery program, which is a prerequisite for certification in general surgery. We demonstrate that optical-based metrics outperformed current metrics for surgical certification in classifying subjects with varying surgical expertise. Moreover, we report that optical neuroimaging allows for the successful classification of subjects during the acquisition of these skills.

Digitale ISSN: 2375-2548

Thema: Allgemeine Naturwissenschaft

Publiziert von American Association for the Advancement of Science (AAAS)

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