A5028881759- Astro and Planetary Science
- Stellar, planetary, and galactic studies
- Planetary Science and Exploration
- Atmospheric Ozone and Climate
- Astrophysics and Star Formation Studies
- Spacecraft and Cryogenic Technologies
- Aeolian processes and effects
- Geology and Paleoclimatology Research
- Astronomy and Astrophysical Research
- Space Exploration and Technology
- Atmospheric chemistry and aerosols
- High-pressure geophysics and materials
- Advanced Chemical Physics Studies
- Chemical Thermodynamics and Molecular Structure
- Solar and Space Plasma Dynamics
- Soil erosion and sediment transport
- Isotope Analysis in Ecology
- Molecular Sensors and Ion Detection
- Spectroscopy and Laser Applications
- Molecular Spectroscopy and Structure
- Nuclear Physics and Applications
- Luminescence and Fluorescent Materials
- X-ray Diffraction in Crystallography
- Ionosphere and magnetosphere dynamics
- Diamond and Carbon-based Materials Research
The University of Texas at San Antonio
2022-2025
University of California, Santa Cruz
2019-2023
Anhui Medical University
2023
Beijing National Laboratory for Molecular Sciences
2019-2022
Chinese Academy of Sciences
2014-2022
University of Chinese Academy of Sciences
2021-2022
Laboratoire de Génie Civil, Diagnostic et Durabilité
2022
Johns Hopkins University
2017-2020
Zhejiang University
2020
Qilu University of Technology
2019
Abstract UV radiation can induce photochemical processes in exoplanet atmospheres and produce haze particles. Recent observations suggest that and/or cloud layers could be present the upper of exoplanets. Haze particles play an important role planetary may provide a source organic material to surface impact origin or evolution life. However, very little information is known about cool, high-metallicity exoplanetary atmospheres. Previously, we investigated formation particle size distribution...
Abstract Sub-Neptunes ( R p ∼ 1.25–4 Earth ) remain the most commonly detected exoplanets to date. However, it remains difficult for observations tell whether these intermediate-sized have surfaces and where their are located. Here we propose that abundances of trace species in visible atmospheres sub-Neptunes can be used as proxies determining existence approximate surface conditions. As an example, a state-of-the-art photochemical model simulate atmospheric evolution K2-18b investigate its...
Abstract Atmospheric photochemistry on Titan continuously transforms methane and nitrogen gases into various organic compounds. This study explores the fate of these molecules when they land Titan's surface. Our analytical exploration reveals that most simple organics found in atmosphere, including all nitriles, triple‐bonded hydrocarbons, benzene, as solids. Only a few compounds are liquid phase, while only ethylene remains gaseous. For solids, we further examine their interactions with...
Abstract New observing capabilities coming online over the next few years will provide opportunities for characterization of exoplanet atmospheres. However, clouds/hazes could be present in atmospheres many exoplanets, muting amplitude spectral features. We use laboratory simulations to explore photochemical haze formation H 2 -rich at 800 K with metallicity either 100 or 1000 times solar. find that particles are produced both simulated small particle size (20–140 nm) and relatively low...
In this study, we measured the single-crystal elasticity of α-hydroquinone at ambient conditions using Brillouin spectroscopy to assess feasibility technique for studying mechanical properties organic ices in outer solar system. serves as an temperature analogue low-temperature on Titan and other system bodies. We found that a satisfactory spectrum can be obtained less than 5 min experimental time with negligible damage sample. The best fit elastic moduli were determined C11 = 13.67(8) GPa,...
Relatively little is understood about the atmospheric composition of temperate to warm exoplanets (equilibrium temperature $T_{\rm eq}<$ 1000 K), as many them are found have uncharacteristically flat transmission spectra. Their flattened spectra likely due opacity sources such planet-wide photochemical hazes and condensation clouds. We compile 25 previously observed by Hubble Space Telescope quantify haziness each exoplanet using a normalized amplitude water absorption feature ($A_{\rm H}$)....
Abstract Titan has a diverse range of materials in its atmosphere and on surface: the simple organics that reside various phases (gas, liquid, ice) solid complex refractory form Titan’s haze layers. These all actively participate physical processes Titan, many material properties are found to be important shaping these processes. Future situ explorations would likely encounter materials, comprehensive database archive possible candidates will needed. Here, we summarize several organic...
In this work, we report the fabrication of a blend consisting fluorescent 1 nanofibers and amberlyst-15 particles as turn-on fluorescence sensor for trace TATP vapors. Fluorescence imaging lifetime analysis reveal that interface between exhibits stronger photoluminescence than unblended areas because formed strong hydrogen bonding between. Furthermore, interfacial adhesion can be amplified by H2O2, which in turn gives rise to rapid remarkable enhancement. When exposed vapors, component...
In this work, we report the fabrication of a two-member fluorescence sensor array that enables assessment three stages (fresh, slightly spoiled, and moderately or severely spoiled) meat spoilage. The first member array, which has strong chalcogen bonding sulfur-π interactions with organic sulfides, exhibits very high sensitivity, while second weak lower sensitivity. On basis combined responses two members, spoilage, including fresh, can be monitored. Notably, using volatiles collected from 5...
Abstract Super-Earths and mini-Neptunes are the most abundant types of planets among ∼3500 confirmed exoplanets, expected to exhibit a wide variety atmospheric compositions. Recent transmission spectra super-Earths have demonstrated possibility that exoplanets haze/cloud layers at high altitudes in their atmospheres. However, compositions, size distributions, optical properties these particles exoplanet atmospheres poorly understood. Here, we present results experimental laboratory...
The photochemical haze produced in the upper atmosphere of Titan plays a key role various atmospheric and surface processes on Titan. energy, one important physical properties haze, is crucial for understanding growth particles can be used to predict their wetting behavior with solid liquid species We analog materials, so-called "tholin", different energy sources measured energies through contact angle direct force measurements. From measurement, we found that tholins by cold plasma UV...
Abstract Titan, the largest moon of Saturn, is characterized by gigantic linear dunes and an active dust cycle. Much like on Earth, these aeolian processes are caused wind‐driven saltation surface grains. It still unclear, however, how Titan can occur despite typically weak winds potentially cohesive Here, we explore hypothesis that may be sustained at lower wind speeds than previously thought, primarily through granular splash rather aerodynamic lifting We propose a mass flux...
To understand the origin of dunes on Titan, it is important to investigate material properties Titan's organic sand particles Titan. The may behave distinctively compared quartz/basaltic terrestrial planets (Earth, Venus, Mars) due differences in interparticle forces. We measured surface energy (through contact angle measurements) and elastic modulus Atomic Force Microscopy, AFM) Titan aerosol analog (tholin). find a tholin thin film about 70.9 mN/m its 3.0 GPa (similar hard polymers like...
Abstract Understanding the surface temperature and interior structure of cold-to-temperate sub-Neptunes is critical for assessing their habitability, yet direct observations are challenging. In this study, we investigate impact water condensation on atmospheric compositions sub-Neptunes, focusing implications James Webb Space Telescope (JWST) spectroscopic observations. By modeling photochemistry two canonical K2-18 b LHS 1140 b, both with without thick atmospheres, demonstrate that can...
Abstract Water clouds are expected to form on Y dwarfs and giant planets with equilibrium temperatures near or below that of Earth, drastically altering their atmospheric compositions albedos thermal emission spectra. Here we use the 1D Community Aerosol Radiation Model for Atmospheres (CARMA) investigate microphysics water cool substellar worlds constrain typical particle sizes vertical extent, taking into consideration nucleation condensation, which have not been considered in detail H/He...
Abstract Acetylene and benzene are two common molecules formed in Titan’s atmosphere, likely components of the lake evaporites. It is known that these can form a cocrystal, molecule with structure unique from component molecules. Thus, we sought to study this cocrystal using an experimental setup simulates Titan surface conditions (90 K, 1.5 bar). Using Fourier transform infrared (FTIR) spectroscopy, characterize new spectral absorptions, band shifts, morphological sample changes associated...
Abstract In Titan’s nitrogen-methane atmosphere, photochemistry leads to the production of complex organic particles, forming thick haze layers. Laboratory-produced aerosol analogs, or “tholins,” are produced in a number laboratories; however, most previous studies have investigated analogs by only one laboratory rather than systematic, comparative analysis. this study, we performed study an important material property, surface energy, seven tholin samples three independent laboratories...
In this work, we report the design of novel fluorophores that bear three benzothiadiazole and benzoselenadiazole groups, respectively, for sensitive detection trimethyl arsine vapor. particular, fluorophore with groups can form stronger chalcogen bonding than which in turn triggers much faster more fluorescence responses. On basis mechanism, vapor rapid response (∼3 s), high sensitivity (the theoretical LOD is 0.44 ppb), selectivity achieved on bundled nanofibers from groups. Here, new...
Idiopathic pulmonary fibrosis (IPF) is a fatal interstitial lung disease characterized by chronic, progressive, and fibrotic injury. Although remarkable progress has been made toward understanding the pathogenesis of PF, finding more effective treatments for this remains challenge. In study, we describe an innovative macrophage-based approach to deliver anti-fibrotic protein inhibit PF in mouse model bleomycin (BLM)-induced We engineered macrophages continuously secrete three types proteins:...
Abstract. Streamflow forecasts are traditionally effective in mitigating water scarcity and flood defense. This study developed an Artificial Intelligence (AI)-based management methodology that integrated multi-step streamflow multi-objective reservoir operation optimization for resource allocation. Following the methodology, we aimed to assess forecast quality forecast-informed operations performance together due influence of inflow uncertainty. Varying combinations climate hydrological...