A5111108754- Planetary Science and Exploration
- Astro and Planetary Science
- Space Exploration and Technology
- Spacecraft and Cryogenic Technologies
- Atmospheric Ozone and Climate
- Geological and Geochemical Analysis
- High-pressure geophysics and materials
- Geochemistry and Geologic Mapping
- Atmospheric and Environmental Gas Dynamics
- Geophysics and Gravity Measurements
- Radio Wave Propagation Studies
- Ionosphere and magnetosphere dynamics
- Atmospheric chemistry and aerosols
- Atmospheric aerosols and clouds
- Space Science and Extraterrestrial Life
- Meteorological Phenomena and Simulations
- Calibration and Measurement Techniques
- Infrared Target Detection Methodologies
- Earthquake Detection and Analysis
- Spacecraft Design and Technology
- GNSS positioning and interference
- Spaceflight effects on biology
- Inertial Sensor and Navigation
- Precipitation Measurement and Analysis
- Scientific Research and Discoveries
Texas A&M University
2004-2025
Indiana University Health
2024
Indiana University Bloomington
2024
Indiana University School of Medicine
2024
Indiana University – Purdue University Indianapolis
2024
Indiana University Melvin and Bren Simon Comprehensive Cancer Center
2024
Southwest Research Institute
2009-2011
University of Tennessee at Knoxville
1999-2008
Cornell University
2000-2004
Space Science Institute
2004
Mars Pathfinder obtained multispectral, elemental, magnetic, and physical measurements of soil dust at the Sagan Memorial Station during course its 83 sol mission. We describe initial results from these measurements, concentrating on multispectral elemental data, use along with previous Viking, SNC meteorite, telescopic results, to help constrain origin evolution Martian dust. find that soils can be divided into least eight distinct spectral units, based parameterization Imager for (IMP) 400...
Rocks on the floor of Gusev crater are basalts uniform composition and mineralogy. Olivine, only mineral to have been identified or inferred from data by all instruments Spirit rover, is especially abundant in these rocks. These picritic similar many respects certain Martian meteorites (olivine‐phyric shergottites). The olivine megacrysts both intermediate compositions, with modal abundances ranging up 20–30%. Associated minerals include low‐calcium high‐calcium pyroxenes, plagioclase...
The Spirit landing site in Gusev Crater on Mars contains dark, fine-grained, vesicular rocks interpreted as lavas. Pancam and MiniâThermal Emission Spectrometer (Mini-TES) spectra suggest that all of these are similar but have variable coatings dust mantles. Magnified images brushed abraded rock surfaces show alteration rinds veins. Rock interiors contain â¤25% megacrysts. Chemical analyses by the Alpha Particle X-ray consistent with picritic basalts, containing normative olivine,...
A visible atmospheric optical depth of 0.9 was measured by the Spirit rover at Gusev crater and Opportunity Meridiani Planum. Optical decreased about 0.6 to 0.7% per sol through both 90-sol primary missions. The vertical distribution dust consistent with uniform mixing, a scale height 11.56 +/- 0.62 kilometers. dust's cross section weighted mean radius 1.47 0.21 micrometers (mm) 1.52 0.18 mm Meridiani. Comparison depths 9-mm shows visible-to-infrared ratio 2.0 0.2 for comparison previous...
Rocks at the Mars Pathfinder site are probably locally derived. Textures on rock surfaces may indicate volcanic, sedimentary, or impact‐generated rocks, but aeolian abration and dust coatings prevent unambiguous interpretation. Multispectral imaging has resolved four spectral classes of rocks: gray red, which occur different same rocks; pink, is soil crusts; maroon, occurs as large boulders, mostly in far field. assigned to two trends based position peak reflectance: primary trend contains...
Overflights of the Mars Exploration Rovers (MER) by Global Surveyor (MGS) provide a unique opportunity to examine some basic properties dust aerosols, starting with one most fundamental, indices refraction ( m = n + ik ) in infrared. The upward‐viewing geometry Miniature Thermal Emission Spectrometer (Mini‐TES) and combined contemporaneous observations from both MER MGS are powerful tools. Their use allows atmospheric retrievals directly determine k while offering constraints for menagerie...
Opportunity has investigated in detail rocks on the rim of Noachian age Endeavour crater, where orbital spectral reflectance signatures indicate presence Fe +3 -rich smectites. The are associated with fine-grained, layered containing spherules diagenetic or impact origin. overlain by breccias, and both units cut calcium sulfate veins precipitated from fluids that circulated after impact. Compositional data for fractures suggest formation Al-rich smectites aqueous leaching. Evidence is thus...
Complete sets of mineral abundances for relatively unaltered volcanic or volcaniclastic rocks in Gusev Crater have been determined by modeling Mössbauer subspectral areas as weight percentages, and combining those percentages with the proportions iron‐free minerals not detected (normative plagioclase, apatite, chromite, calculated from Alpha Particle X‐Ray Spectrometer (APXS) chemical analyses). Comparisons synthetic thermal emission spectra these modes measured Miniature Thermal Emission...
Abstract Frequent relapse and development of chemoresistance leads to poor prognosis in ovarian cancer (OC). Cancer stem cells (CSCs) consist a small subpopulation the tumor that are typically resistant cytotoxic chemotherapy potential cause chemoresistance. Using patient specimens as well vitro models, we determined CSCs enriched niche adjacent associated fibroblasts (CAFs) after chemotherapy. major constituent microenvironment highly residual tumors following Therefore, studied role CAFs...