A. J. Westphal
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View article: BLISS: Interplanetary Exploration with Swarms of Low-Cost Spacecraft
BLISS: Interplanetary Exploration with Swarms of Low-Cost Spacecraft Open
Leveraging advancements in micro-scale technology, we propose a fleet of autonomous, low-cost, small solar sails for interplanetary exploration. The Berkeley Low-cost Interplanetary Solar Sail (BLISS) project aims to utilize small-scale te…
View article: Automatic detection of impact craters on Al foils from the Stardust interstellar dust collector using convolutional neural networks
Automatic detection of impact craters on Al foils from the Stardust interstellar dust collector using convolutional neural networks Open
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 …
View article: Fast, computer‐assisted detection of dust and debris impact craters on Stardust interstellar foils
Fast, computer‐assisted detection of dust and debris impact craters on Stardust interstellar foils Open
The NASA Stardust Interstellar Dust collection provides our current best sample set for direct laboratory analysis of dust grains from the contemporary interstellar dust stream. While a handful of likely interstellar dust grains were ident…
View article: Volatile Sample Return in the Solar System
Volatile Sample Return in the Solar System Open
We advocate for the realization of volatile sample return from various destinations including: small bodies, the Moon, Mars, ocean worlds/satellites, and plumes. As part of recent mission studies (e.g., Comet Astrobiology Exploration SAmpl…
View article: Rapid cometary sample return enabled by low-cost, 10-gram interplanetary spacecraft
Rapid cometary sample return enabled by low-cost, 10-gram interplanetary spacecraft Open
Whitepaper #377 submitted to the Planetary Science and Astrobiology Decadal Survey 2023-2032. Topics: primitive bodies; solar system formation, dynamics processes, and chronology; technology development
View article: Interplanetary and interstellar dust as windows into solar system origins and evolution.
Interplanetary and interstellar dust as windows into solar system origins and evolution. Open
Whitepaper #122 submitted to the Planetary Science and Astrobiology Decadal Survey 2023-2032. Topics: other science themes: interplanetary and interstellar dust; primitive bodies; solar system formation, dynamics processes, and chronology
View article: Automatic detection of impact craters on Al foils from the Stardust\n interstellar dust collector using convolutional neural networks
Automatic detection of impact craters on Al foils from the Stardust\n interstellar dust collector using convolutional neural networks Open
NASA's Stardust mission utilized a sample collector composed of aerogel and\naluminum foil to return cometary and interstellar particles to Earth. Analysis\nof the aluminum foil begins with locating craters produced by hypervelocity\nimpac…
View article: Chondrules from high-velocity collisions: thermal histories and the agglomeration problem
Chondrules from high-velocity collisions: thermal histories and the agglomeration problem Open
We assess whether chondrules, once-molten mm-sized spheres filling the oldest meteorites, could have formed from super-km s−1 collisions between planetesimals in the solar nebula. High-velocity collisions release hot and dense clouds of si…
View article: Chondrules as fallout from vaporizing impacts in the solar nebula
Chondrules as fallout from vaporizing impacts in the solar nebula Open
We consider how chondrules, once-molten mm-sized spheres filling the oldest meteorites, may have formed as the thermally processed fallout from planetesimal collisions in the primordial solar nebula. We focus on the cloud of hot and dense …
View article: Cryogenic Cometary Sample Return
Cryogenic Cometary Sample Return Open
Comets likely formed in the outer regions of the protosolar nebula where they incorporated and preserved primitive presolar materials, volatiles resident in the outer disk, and more refractory materials from throughout the disk. The return…
View article: Fast, Computer-Assisted Detection of μm-Scale Dust Impact Craters on Spacecraft Materials
Fast, Computer-Assisted Detection of μm-Scale Dust Impact Craters on Spacecraft Materials Open
Journal Article Fast, Computer-Assisted Detection of μm-Scale Dust Impact Craters on Spacecraft Materials Get access Bradley De Gregorio, Bradley De Gregorio U.S. Naval Research Laboratory, Washington, District of Columbia, United States S…
View article: A Sintered and Sulfidized Equilibrated Aggregate from an Interplanetary Dust Particle
A Sintered and Sulfidized Equilibrated Aggregate from an Interplanetary Dust Particle Open
Journal Article A Sintered and Sulfidized Equilibrated Aggregate from an Interplanetary Dust Particle Get access Zack Gainsforth, Zack Gainsforth University of California at Berkeley, Berkeley, California, United States Search for other wo…
View article: XAS Between the Stars
XAS Between the Stars Open
Journal Article XAS Between the Stars Get access Zack Gainsforth, Zack Gainsforth Space Sciences Laboratory, University of California, Berkeley, CA, USA Corresponding author: [email protected] Search for other works by this author on:…
View article: Ultra-heavy cosmic-ray science--Are r-process nuclei in the cosmic rays produced in supernovae or binary neutron star mergers?
Ultra-heavy cosmic-ray science--Are r-process nuclei in the cosmic rays produced in supernovae or binary neutron star mergers? Open
The recent detection of 60Fe in the cosmic rays provides conclusive evidence that there is a recently synthesized component (few MY) in the GCRs (Binns et al. 2016). In addition, these nuclei must have been synthesized and accelerated in s…
View article: Fine‐grained material associated with a large sulfide returned from Comet 81P/Wild 2
Fine‐grained material associated with a large sulfide returned from Comet 81P/Wild 2 Open
In a consortium analysis of a large particle captured from the coma of comet 81P/Wild 2 by the Stardust spacecraft, we report the discovery of a field of fine‐grained material (FGM) in contact with a large sulfide particle. The FGM was par…
View article: Analyses of Extreme Ultraviolet Spectra from Tokamak Plasmas
Analyses of Extreme Ultraviolet Spectra from Tokamak Plasmas Open
The most recent work was a one-year extension of work started in 2015, for a total duration of three years. During this time we performed detailed spectral analyses of extreme ultraviolet spectra taken by Lawrence Livermore National Labora…
View article: Helium and neon in comet 81P/Wild 2 samples from the <scp>NASA</scp> Stardust mission
Helium and neon in comet 81P/Wild 2 samples from the <span>NASA</span> Stardust mission Open
Helium and neon distributions are reported for a variety of Stardust comet 81P/Wild 2 samples, including particle tracks and terminal particles, cell surface and subsurface slices from the comet coma and interstellar particle collection tr…
View article: Cometary dust, present understanding and open questions after the Rosetta mission
Cometary dust, present understanding and open questions after the Rosetta mission Open
International audience
View article: Atomic layer deposition of 2D and 3D standards for synchrotron-based quantitative composition and structure analysis methods
Atomic layer deposition of 2D and 3D standards for synchrotron-based quantitative composition and structure analysis methods Open
Atomic layer deposition (ALD) is a scalable deposition technique known for producing uniform, conformal films of a wide range of compounds on nearly any substrate material. These traits make it an ideal deposition method for producing film…
View article: More than 30 000 volunteers involved in identification of tiny rare interstellar dust particle candidates collected by the Stardust mission
More than 30 000 volunteers involved in identification of tiny rare interstellar dust particle candidates collected by the Stardust mission Open
The NASA Stardust mission returned the first tiny samples of interstellar dust from beyond the borders of our solar system. This region is almost devoid of matter and the interstellar dust particles floating through our solar system are ex…
View article: The future of Stardust science
The future of Stardust science Open
Recent observations indicate that >99% of the small bodies in the solar system reside in its outer reaches—in the Kuiper Belt and Oort Cloud. Kuiper Belt bodies are probably the best‐preserved representatives of the icy planetesimals that …
View article: Insights into solar nebula formation of pyrrhotite from nanoscale disequilibrium phases produced by H<sub>2</sub>S sulfidation of Fe metal
Insights into solar nebula formation of pyrrhotite from nanoscale disequilibrium phases produced by H<sub>2</sub>S sulfidation of Fe metal Open
Lauretta (2005) produced sulfide in the laboratory by exposing canonical nebular metal analogs to H2S gas under temperatures and pressures relevant to the formation of the Solar System. The resulting reactions produced a suite of sulfides …
View article: Atomic Layer deposition of 2D and 3D standards for quantitative synchrotron-based composition and structural analysis methods
Atomic Layer deposition of 2D and 3D standards for quantitative synchrotron-based composition and structural analysis methods Open
The use of Standard Reference Materials (SRM) from the National Institute of Standards and Technology (NIST) for quantitative analysis of chemical composition using Synchrotron based X-Ray Florescence (SR-XRF) and Scanning Transmission X-R…
View article: Elemental Abundances of Ultra-Heavy GCRs measured by SuperTIGER and ACE-CRIS and the Origin of Galactic Cosmic Rays
Elemental Abundances of Ultra-Heavy GCRs measured by SuperTIGER and ACE-CRIS and the Origin of Galactic Cosmic Rays Open
The Super Trans-Iron Galactic Element Recorder (SuperTIGER) long-duration balloon instrument and the Cosmic Ray Isotope Spectrometer (CRIS) on the NASA Advanced Composition Explorer (ACE) satellite have measured the abundances of galactic …
View article: MultiLaue: A Technique to Extract d-spacings from Laue XRD
MultiLaue: A Technique to Extract d-spacings from Laue XRD Open
We present that broad spectrum X-ray Diffraction (XRD) is named Laue after Max von Laue, and is the original XRD technique. Today, monochromatic XRD is more common because Bragg's equation allows determination of d-spacings where Laue does…