A5009751420- Atmospheric chemistry and aerosols
- Geophysics and Gravity Measurements
- Spacecraft Design and Technology
- Ionosphere and magnetosphere dynamics
- Fluid Dynamics and Thin Films
- Air Quality and Health Impacts
- Atmospheric aerosols and clouds
- Catalytic Processes in Materials Science
- Vehicle emissions and performance
- Solar and Space Plasma Dynamics
- Radioactive contamination and transfer
- Advanced Combustion Engine Technologies
- Surface Modification and Superhydrophobicity
- Atmospheric Ozone and Climate
- Hybrid Renewable Energy Systems
- Particle Dynamics in Fluid Flows
- Toxic Organic Pollutants Impact
- Radioactive element chemistry and processing
- Planetary Science and Exploration
- Integrated Energy Systems Optimization
- Electrowetting and Microfluidic Technologies
- Laser-induced spectroscopy and plasma
- Combustion and Detonation Processes
- Air Quality Monitoring and Forecasting
- Inertial Sensor and Navigation
Lawrence Livermore National Laboratory
2020-2024
Carnegie Mellon University
2019
The University of Texas at Austin
2012-2016
Cummins (United Kingdom)
2014-2015
Cummins (United States)
2015
Polystyrene (PS) that has been exposed to ultraviolet light (UV) undergoes partial dehydrogenation of the alkane polymer backbone which increases its surface energy. Exploiting this photochemistry, we polystyrene films UV using a photomask induce patterned photochemical reaction producing regions in film with differing Upon heating solid preprogrammed energy pattern liquid state, flows from low unexposed high regions. This flow creates three-dimensional topography by Marangoni Effect,...
More stringent emission requirements for nonroad diesel engines introduced with U.S. Tier 4 Final and Euro Stage IV V regulations have spurred the development of exhaust aftertreatment technologies. In this study, several configurations consisting oxidation catalysts (DOC), particulate filters (DPF), Cu zeolite-, vanadium-based selective catalytic reduction (SCR) catalysts, ammonia (AMOX) are evaluated using both Nonroad Transient (NRTC) Steady (8-mode NRSC) Cycles in order to understand...
Fast and accurate predictions of the flow transport materials in urban complex terrain areas are challenging because heterogeneity buildings land features different shapes sizes connected by canyons channels, which results patterns turbulence that can enhance material concentrations certain regions. To address this challenge, we have developed an efficient three-dimensional computational fluid dynamics (CFD) code called Aeolus is based on first principles for predicting dispersion areas. The...
The Marangoni effect describes how fluid flows in response to gradients surface energy. This phenomenon could be broadly harnessed pattern the topography of polymer films if generalizable techniques for programming energy existed. Here, a near UV–visible light (NUV–vis) photosensitizer, 9,10-dibromo-anthracene (DBA), was doped into thin model polymer, poly(isobutyl methacrylate). After exposure through photomask and heating above glass transition, thermolysis photo-oxidized DBA grafting...
Abstract Nuclear detonations produce hazardous local and global particles or fallout. Predicting fallout size, chemical components, location is necessary to inform officials determine immediate guidance for the public. However, existing nuclear detonation models prescribe particle size distributions based on limited observations. In this work, we apply super‐droplet method, which a numerical modeling technique developed cloud microphysics, simulate of in mushroom formed post‐detonation...
Abstract. Atmospheric aerosol microphysical processes are a significant source of uncertainty in predicting climate change. Specifically, nucleation, emissions, and growth rates, which simulated chemical transport models to predict the particle size distribution, not understood well. However, long-term distribution measurements made at several ground-based sites across Europe implicitly contain information about that created those distributions. This work aims extract by developing applying...
Abstract. Atmospheric aerosol microphysical processes are a significant source of uncertainty in predicting climate change. Specifically, nucleation, emissions, and growth rates, which simulated chemical transport models to predict the particle size distribution, not understood well. However, long-term distribution measurements made at several ground-based sites across Europe implicitly contain information about that created those distributions. This work aims extract by developing applying...
Abstract. Stellar occultation observations from space can probe the stratosphere and mesosphere at a fine vertical scale around globe. Unlike other measurement techniques like radiosondes aircraft, stellar has potential to observe atmosphere above 30 km, unlike radio occultation, probes fine-scale phenomena with atmospheric turbulence. We imaged refractive bending angle of star centroid for series occultations by atmosphere. Atmospheric refractivity, density, then temperature are retrieved...
Abstract. Stellar occultation observations from space can probe the stratosphere and mesosphere at a fine vertical scale around globe unlike other measurement techniques like radiosondes, aircraft, radio occultation. We imaged refractive bending angle of star centroid for series occultations by atmosphere. Atmospheric refractivity, density, then temperature are retrieved with Abel transformation Edlén's law, hydrostatic equation, ideal gas law. The retrieval technique is applied to data...