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OSIRIS-REx Contamination Control Strategy and Implementation (2017)

Clark, B. C. ; Beshore, E. ; Aponte, J. C. ; [weitere]

In: CASI

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Publikationsdatum: 2019-08-13

Beschreibung: OSIRIS-REx will return pristine samples of carbonaceous asteroid Bennu. This manuscript describes how pristine was defined based on expectations of Bennu and on a realistic understanding of what is achievable with a constrained schedule and budget, and how that definition flowed to requirements and implementation. To return a pristine sample, the OSIRIS-REx spacecraft sampling hardware was maintained at Level 100 A/2 and less than 180 nanograms per square centimeter of amino acids and hydrazine on the sampler head through precision cleaning, control of materials, and vigilance. Contamination is further characterized via witness material exposed to the spacecraft assembly and testing environment as well as in space. This characterization provided knowledge of the expected background and will be used in conjunction with archived spacecraft components for comparison with the samples when they are delivered to Earth for analysis. Most of all, the cleanliness of the OSIRIS-REx spacecraft was achieved through communication between scientists, engineers, managers, and technicians.

Schlagwort(e): Lunar and Planetary Science and Exploration

Materialart: GSFC-E-DAA-TN41800 , International Conference on the Origin of Life; Jul 16, 2018 - Jul 21, 2018; San Diego, CA; United States

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OSIRIS-REx Contamination Control Strategy and Implementation (2017)

Connolly, H. C., Jr. ; Righter, K. ; Everett, D. F. ; [weitere]

In: Other Sources

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Publikationsdatum: 2019-08-26

Beschreibung: OSIRIS-REx will return pristine samples of carbonaceous asteroid Bennu. This article describes how pristine was defined based on expectations of Bennu and on a realistic understanding of what is achievable with a constrained schedule and budget, and how that definition flowed to requirements and implementation. To return a pristine sample, the OSIRIS-REx spacecraft sampling hardware was maintained at level 100 A/2 and less than 180 ng/cm(exp 2) of amino acids and hydrazine on the sampler head through precision cleaning, control of materials, and vigilance. Contamination is further characterized via witness material exposed to the spacecraft assembly and testing environment as well as in space. This characterization provided knowledge of the expected background and will be used in conjunction with archived spacecraft components for comparison with the samples when they are delivered to Earth for analysis. Most of all, the cleanliness of the OSIRIS-REx spacecraft was achieved through communication among scientists, engineers, managers, and technicians.

Schlagwort(e): Lunar and Planetary Science and Exploration

Materialart: GSFC-E-DAA-TN50790 , Space Science Review (ISSN 0038-6308) (e-ISSN 1572-9672); 214; 1; 19

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Disruption of the Accidental Dirac Semimetal State in ZrTe_{5} under Hydrostatic Pressure (2017)

J. L. Zhang, C. Y. Guo, X. D. Zhu, L. Ma, G. L. Zheng, Y. Q. Wang, L. Pi, Y. Chen, H. Q. Yuan, and M. L. Tian

American Physical Society (APS)

In: Physical Review Letters

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Publikationsdatum: 2017-05-20

Beschreibung: Author(s): J. L. Zhang, C. Y. Guo, X. D. Zhu, L. Ma, G. L. Zheng, Y. Q. Wang, L. Pi, Y. Chen, H. Q. Yuan, and M. L. Tian We study the effect of hydrostatic pressure on the magnetotransport properties of zirconium pentatelluride. The magnitude of resistivity anomaly gets enhanced with increasing pressure, but the transition temperature T * is insensitive to it up to 2.5 GPa. In the case of H ∥ b , the quasilinear magnetore… [Phys. Rev. Lett. 118, 206601] Published Fri May 19, 2017

Schlagwort(e): Condensed Matter: Electronic Properties, etc.

Print ISSN: 0031-9007

Digitale ISSN: 1079-7114

Thema: Physik

Publiziert von American Physical Society (APS)

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Ultrafast Formation of a Charge Density Wave State in 1T−TaS_{2} : Observation at Nanometer Scales Using Time-Resolved X-Ray Diffraction (2017)

C. Laulhé, T. Huber, G. Lantz, A. Ferrer, S. O. Mariager, S. Grübel, J. Rittmann, J. A. Johnson, V. Esposito, A. Lübcke, L. Huber, M. Kubli, M. Savoini, V. L. R. Jacques, L. Cario, B. Corraze, E. Janod, G. Ingold, P. Beaud, S. L. Johnson, and S. Ravy

American Physical Society (APS)

In: Physical Review Letters

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Publikationsdatum: 2017-06-17

Beschreibung: Author(s): C. Laulhé, T. Huber, G. Lantz, A. Ferrer, S. O. Mariager, S. Grübel, J. Rittmann, J. A. Johnson, V. Esposito, A. Lübcke, L. Huber, M. Kubli, M. Savoini, V. L. R. Jacques, L. Cario, B. Corraze, E. Janod, G. Ingold, P. Beaud, S. L. Johnson, and S. Ravy Femtosecond time-resolved x-ray diffraction is used to study a photoinduced phase transition between two charge density wave (CDW) states in 1 T − TaS 2 , namely the nearly commensurate (NC) and the incommensurate (I) CDW states. Structural modulations associated with the NC-CDW order are found to disapp… [Phys. Rev. Lett. 118, 247401] Published Fri Jun 16, 2017

Schlagwort(e): Condensed Matter: Electronic Properties, etc.

Print ISSN: 0031-9007

Digitale ISSN: 1079-7114

Thema: Physik

Publiziert von American Physical Society (APS)

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Electron Accumulation and Emergent Magnetism in ${\mathrm{LaMnO}}_{3}/{\mathrm{SrTiO}}_{3}$ Heterostructures (2017)

Zuhuang Chen, Zhanghui Chen, Z. Q. Liu, M. E. Holtz, C. J. Li, X. Renshaw Wang, W. M. Lü, M. Motapothula, L. S. Fan, J. A. Turcaud, L. R. Dedon, C. Frederick, R. J. Xu, R. Gao, A. T. N’Diaye, E. Arenholz, J. A. Mundy, T. Venkatesan, D. A. Muller, L.-W. Wang, Jian Liu, and L. W. Martin

American Physical Society (APS)

In: Physical Review Letters

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Publikationsdatum: 2017-10-12

Beschreibung: Author(s): Zuhuang Chen, Zhanghui Chen, Z. Q. Liu, M. E. Holtz, C. J. Li, X. Renshaw Wang, W. M. Lü, M. Motapothula, L. S. Fan, J. A. Turcaud, L. R. Dedon, C. Frederick, R. J. Xu, R. Gao, A. T. N’Diaye, E. Arenholz, J. A. Mundy, T. Venkatesan, D. A. Muller, L.-W. Wang, Jian Liu, and L. W. Martin Emergent phenomena at polar-nonpolar oxide interfaces have been studied intensely in pursuit of next-generation oxide electronics and spintronics. Here we report the disentanglement of critical thicknesses for electron reconstruction and the emergence of ferromagnetism in polar-mismatched LaMnO 3 / SrT... [Phys. Rev. Lett. 119, 156801] Published Wed Oct 11, 2017

Schlagwort(e): Condensed Matter: Electronic Properties, etc.

Print ISSN: 0031-9007

Digitale ISSN: 1079-7114

Thema: Physik

Publiziert von American Physical Society (APS)

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Spectral Characterization of Analog Samples in Anticipation of OSIRIS-REx's Arrival at Bennu (2017)

Donaldson Hanna, K. L. ; Clark, B. E. ; Hamilton, V. E. ; [weitere]

In: CASI

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Publikationsdatum: 2019-07-13

Beschreibung: NASA's Origins, Spectral Interpretation, Resource Identification, and Security-Regolith Explorer (OSIRIS-REx) mission successfully launched on September 8th, 2016. During its rendezvous with near-Earth asteroid (101955) Bennu beginning in 2018, OSIRIS-REx will characterize the asteroid's physical, mineralogical, and chemical properties in an effort to globally map the properties of Bennu, a primitive carbonaceous asteroid, and choose a sampling location [e.g. 1]. In preparation for these observations, we spectrally characterized a suite of analog samples across visible, near- and thermal-infrared wavelengths and used these in initial tests of phase detection and abundance determination software algorithms. Here we present the thermal infrared laboratory measurements of the analog sample suite measured under asteroidlike conditions, which are relevant to the interpretation of spectroscopic observations by the OSIRIS-REx Thermal Emission Spectrometer (OTES) [2, 3]. This suite of laboratory measurements of asteroid analogs under asteroid-like conditions is the first of their kind.

Schlagwort(e): Lunar and Planetary Science and Exploration

Materialart: JSC-CN-38849 , Lunar and Planetary Science Conference; Mar 20, 2017 - Mar 24, 2017; The Woodlands, TX; United States

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Atomic-layered Au clusters on {alpha}-MoC as catalysts for the low-temperature water-gas shift reaction (2017)

Yao, S., Zhang, X., Zhou, W., Gao, R., Xu, W., Ye, Y., Lin, L., Wen, X., Liu, P., Chen, B., Crumlin, E., Guo, J., Zuo, Z., Li, W., Xie, J., Lu, L., Kiely, C. J., Gu, L., Shi, C., Rodriguez, J. A., Ma, D.

American Association for the Advancement of Science (AAAS)

In: Science

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Publikationsdatum: 2017-07-28

Beschreibung: The water-gas shift (WGS) reaction (where carbon monoxide plus water yields dihydrogen and carbon dioxide) is an essential process for hydrogen generation and carbon monoxide removal in various energy-related chemical operations. This equilibrium-limited reaction is favored at a low working temperature. Potential application in fuel cells also requires a WGS catalyst to be highly active, stable, and energy-efficient and to match the working temperature of on-site hydrogen generation and consumption units. We synthesized layered gold (Au) clusters on a molybdenum carbide (α-MoC) substrate to create an interfacial catalyst system for the ultralow-temperature WGS reaction. Water was activated over α-MoC at 303 kelvin, whereas carbon monoxide adsorbed on adjacent Au sites was apt to react with surface hydroxyl groups formed from water splitting, leading to a high WGS activity at low temperatures.

Schlagwort(e): Chemistry

Print ISSN: 0036-8075

Digitale ISSN: 1095-9203

Thema: Biologie , Chemie und Pharmazie , Geologie und Paläontologie , Informatik , Medizin , Allgemeine Naturwissenschaft , Physik

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

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Femtosecond laser reshaping yields gold nanorods with ultranarrow surface plasmon resonances (2017)

Gonzalez-Rubio, G., Diaz-Nunez, P., Rivera, A., Prada, A., Tardajos, G., Gonzalez-Izquierdo, J., Banares, L., Llombart, P., Macdowell, L. G., Alcolea Palafox, M., Liz-Marzan, L. M., Pena-Rodriguez, O., Guerrero-Martinez, A.

American Association for the Advancement of Science (AAAS)

In: Science

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Publikationsdatum: 2017-11-03

Beschreibung: The irradiation of gold nanorod colloids with a femtosecond laser can be tuned to induce controlled nanorod reshaping, yielding colloids with exceptionally narrow localized surface plasmon resonance bands. The process relies on a regime characterized by a gentle multishot reduction of the aspect ratio, whereas the rod shape and volume are barely affected. Successful reshaping can only occur within a narrow window of the heat dissipation rate: Low cooling rates lead to drastic morphological changes, and fast cooling has nearly no effect. Hence, a delicate balance must be achieved between irradiation fluence and surface density of the surfactant on the nanorods. This perfection process is appealing because it provides a simple, fast, reproducible, and scalable route toward gold nanorods with an optical response of exceptional quality, near the theoretical limit.

Schlagwort(e): Chemistry

Print ISSN: 0036-8075

Digitale ISSN: 1095-9203

Thema: Biologie , Chemie und Pharmazie , Geologie und Paläontologie , Informatik , Medizin , Allgemeine Naturwissenschaft , Physik

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

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Atomic structure of sensitive battery materials and interfaces revealed by cryo-electron microscopy (2017)

Li, Y., Li, Y., Pei, A., Yan, K., Sun, Y., Wu, C.-L., Joubert, L.-M., Chin, R., Koh, A. L., Yu, Y., Perrino, J., Butz, B., Chu, S., Cui, Y.

American Association for the Advancement of Science (AAAS)

In: Science

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Publikationsdatum: 2017-10-27

Beschreibung: Whereas standard transmission electron microscopy studies are unable to preserve the native state of chemically reactive and beam-sensitive battery materials after operation, such materials remain pristine at cryogenic conditions. It is then possible to atomically resolve individual lithium metal atoms and their interface with the solid electrolyte interphase (SEI). We observe that dendrites in carbonate-based electrolytes grow along the 〈111〉 (preferred), 〈110〉, or 〈211〉 directions as faceted, single-crystalline nanowires. These growth directions can change at kinks with no observable crystallographic defect. Furthermore, we reveal distinct SEI nanostructures formed in different electrolytes.

Schlagwort(e): Chemistry

Print ISSN: 0036-8075

Digitale ISSN: 1095-9203

Thema: Biologie , Chemie und Pharmazie , Geologie und Paläontologie , Informatik , Medizin , Allgemeine Naturwissenschaft , Physik

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

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Consequences of Spin-Orbit Coupling at the Single Hole Level: Spin-Flip Tunneling and the Anisotropic g Factor (2017)

A. Bogan, S. A. Studenikin, M. Korkusinski, G. C. Aers, L. Gaudreau, P. Zawadzki, A. S. Sachrajda, L. A. Tracy, J. L. Reno, and T. W. Hargett

American Physical Society (APS)

In: Physical Review Letters

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Publikationsdatum: 2017-04-21

Beschreibung: Author(s): A. Bogan, S. A. Studenikin, M. Korkusinski, G. C. Aers, L. Gaudreau, P. Zawadzki, A. S. Sachrajda, L. A. Tracy, J. L. Reno, and T. W. Hargett Hole transport experiments were performed on a gated double quantum dot device defined in a p - GaAs / AlGaAs heterostructure with a single hole occupancy in each dot. The charging diagram of the device was mapped out using charge detection confirming that the single hole limit is reached. In that limit… [Phys. Rev. Lett. 118, 167701] Published Thu Apr 20, 2017

Schlagwort(e): Condensed Matter: Electronic Properties, etc.

Print ISSN: 0031-9007

Digitale ISSN: 1079-7114

Thema: Physik

Publiziert von American Physical Society (APS)

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