A5005368044- Planetary Science and Exploration
- Astro and Planetary Science
- High-pressure geophysics and materials
- Geological and Geochemical Analysis
- Geology and Paleoclimatology Research
- Iron and Steelmaking Processes
- earthquake and tectonic studies
- Diamond and Carbon-based Materials Research
- Scientific Research and Discoveries
- Thermochemical Biomass Conversion Processes
- Luminescence Properties of Advanced Materials
- Microstructure and Mechanical Properties of Steels
- Nuclear materials and radiation effects
- Nuclear Materials and Properties
- Geochemistry and Elemental Analysis
- Geotechnical and Geomechanical Engineering
- Metal Extraction and Bioleaching
- Electronic and Structural Properties of Oxides
- Metal and Thin Film Mechanics
- Geological Modeling and Analysis
- Hydrocarbon exploration and reservoir analysis
- Paleontology and Stratigraphy of Fossils
- Geochemistry and Geologic Mapping
- Metallurgical Processes and Thermodynamics
- Rare-earth and actinide compounds
Harvard University
2019-2025
Planetary Science Institute
2019-2025
Los Alamos National Laboratory
2023-2024
Harvard University Press
2020-2021
RTX (United States)
2008
Drilling consists of 2 processes: breaking the formation with a bit and removing drilled cuttings. In rotary drilling, rotational speed weight on are used to control optimization these parameters can markedly improve drilling performance. Although fluids for cuttings removal in terrestrial most planetary systems conduct dry an auger. Chip via water-ice sublimation (when excavating water-ice-bound formations at pressure below triple point water) pneumatic also possible. Pneumatic use gas or...
Tantalum pentoxide (Ta
Abstract Earth’s inner core exhibits strong seismic anisotropy, often attributed to the alignment of hexagonal close‐packed iron (hcp‐Fe) alloy crystallites with poles. How this developed depends on material properties and is important our understanding core’s crystallization history active geodynamical forcing. Previous studies suggested that hcp‐Fe weak under deep Earth conditions but did not investigate effects lighter elements known be part alloy. Here, we present results from radial...
Abstract Nitrogen, the most abundant element in Earth's atmosphere, is also a primary component of solid nitride minerals found meteorites and on surface. If they remain stable to high pressures temperatures, these nitrides may be important reservoirs nitrogen planetary interiors. We used synchrotron X‐ray diffraction measure thermal equation state phase stability titanium (TiN) laser‐heated diamond anvil cell at up ∼70 GPa temperatures ∼2,500 K. TiN maintains cubic B1 (NaCl‐type) crystal...
The chemical and physical properties of the interiors terrestrial planets are largely determined during their formation differentiation. Modeling a planet’s provides important insights into its core mantle, conversely, knowledge those may constrain formational narratives. Here, we present multi-stage model Martian in which calculate core–mantle equilibration using parameterizations from high pressure–temperature metal–silicate partitioning experiments. We account for changing boundary (CMB)...
Earth’s inner core exhibits strong seismic anisotropy, often attributed to the alignment of hexagonal close-packed iron (hcp-Fe) alloy crystallites with poles. How this developed depends on material properties and is important our understanding core’s crystallization history active geodynamical forcing. Previous studies suggested that hcp-Fe weak under deep Earth conditions but did not investigate effects lighter elements known be part alloy. Here, we present results from radial X-ray...
Actinide-bearing intermetallics display unusual electronic, magnetic, and physical properties that arise from the complex behavior of their $5f$ electron orbitals. Temperature ($T$) effects on actinide are well studied, but high-pressure ($P$) phase stabilities known for only a handful compositions. Furthermore, almost no data exist simultaneous high $P$ $T$. We performed ambient-$T$ diamond-anvil cell x-ray diffraction experiments to study intermetallic...
Earth and Space Science Open Archive PosterOpen AccessYou are viewing the latest version by default [v1]E-MORB OIB petrogenesis investigated with machine learningAuthorsZacharyErikseniDSteinJacobsenCharlesLangmuirJunjieDongiDMatthewBrennaniDJesseGuiDSee all authors Zachary ErikseniDCorresponding Author• Submitting AuthorHarvard UniversityiDhttps://orcid.org/0000-0002-3626-4062view email addressThe was not providedcopy addressStein JacobsenHarvard Universityview addressCharles LangmuirHarvard...
Determining how and when Mars formed has been a long-standing challenge for planetary scientists. The size orbit of are difficult to reproduce in classical simulations accretion, this inspired models inner solar system evolution that tuned produce Mars-like planets. However, such not always coupled geochemical constraints. Analyses Martian meteorites using the extinct hafnium–tungsten (Hf–W) radioisotopic system, which is sensitive timing core formation, have indicated within few million...