Renyu Hu
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View article: Recent advances in visible light-induced C1(sp3)-H functionalization of tetrahydroisoquinolines for C–C bond formation
Recent advances in visible light-induced C1(sp3)-H functionalization of tetrahydroisoquinolines for C–C bond formation Open
Tetrahydroisoquinolines (THIQs) are a significant class of nitrogen-containing heterocyclic compounds often occurring in natural products and pharmaceuticals, exhibiting excellent biological activities and chemical properties, and also hav…
View article: Estimating rice yield-related traits using machine learning models integrating hyperspectral and texture features
Estimating rice yield-related traits using machine learning models integrating hyperspectral and texture features Open
Background Rapidly estimating multiple trait indicators simultaneously, nondestructively, and with high precision is an important means of accurate diagnosis in modern phenomics. Increasing the accuracy of estimation models for rice yield-…
View article: The Exospace Weather Frontier
The Exospace Weather Frontier Open
Space weather is among the most powerful and least understood forces shaping planetary atmospheres. We observe its effects directly on Solar System bodies through atmospheric escape, chemical disruption, cometary tails, and auroral display…
View article: Volcanic Satellites Tidally Venting Na, K, SO2 in Optical & Infrared Light
Volcanic Satellites Tidally Venting Na, K, SO2 in Optical & Infrared Light Open
Recent infrared spectroscopy from the James Webb Space Telescope (JWST) has spurred analyses of common volcanic gases such as carbon dioxide (CO2), sulfur dioxide (SO2), alongside alkali metals sodium (Na i) and potassium (K i) surrounding…
View article: Identifying rocky planets and water worlds among sub-Neptune-sized exoplanets with the Habitable Worlds Observatory
Identifying rocky planets and water worlds among sub-Neptune-sized exoplanets with the Habitable Worlds Observatory Open
Astronomers are debating whether the plentiful "sub-Neptune" exoplanets -- worlds a bit larger than Earth but smaller than Neptune -- are predominantly rocky planets, water-rich "ocean worlds," or gas-enshrouded mini-Neptunes. This questio…
View article: The SPACE Program
The SPACE Program Open
Sub-Neptune exoplanets are the most abundant type of planet known today. As they do not have a Solar System counterpart, many open questions exist about their composition and formation. Previous spectroscopic studies have ruled out aerosol…
View article: Worlds Next Door: A Candidate Giant Planet Imaged in the Habitable Zone of <i>α</i> Centauri A. I. Observations, Orbital and Physical Properties, and Exozodi Upper Limits
Worlds Next Door: A Candidate Giant Planet Imaged in the Habitable Zone of <i>α</i> Centauri A. I. Observations, Orbital and Physical Properties, and Exozodi Upper Limits Open
We report on coronagraphic observations of the nearest solar-type star, α Centauri A ( α Cen A), using the MIRI instrument on the James Webb Space Telescope. The proximity of α Cen (1.33 pc) means that the star’s habitable zone is spatiall…
View article: A water-rich interior in the temperate sub-Neptune K2-18 b revealed by JWST
A water-rich interior in the temperate sub-Neptune K2-18 b revealed by JWST Open
Temperate sub-Neptunes are compelling targets for detecting liquid-water oceans beyond the Solar System. If water-rich and lacking massive hydrogen-helium envelopes, these planets could sustain liquid layers beneath their atmospheres despi…
View article: Investigation of the Current Status of Music Teaching Ability of Special Education Teachers and Exploration of Professional Development Paths
Investigation of the Current Status of Music Teaching Ability of Special Education Teachers and Exploration of Professional Development Paths Open
With the increasing popularity of special education, music education has gradu-ally become an important part of education for children with special needs. This paper investigates the current status of special education teachers' music teac…
View article: Analysis of the Development Status and Countermeasures of Music Education for Special Children in Remote Areas
Analysis of the Development Status and Countermeasures of Music Education for Special Children in Remote Areas Open
With the country's continuous promotion of educational equity and inclusive education, the issue of education for special children has gradually shifted from the margins to the core. Music education, as a unique form of education, has prof…
View article: Evidence for a Volcanic Atmosphere on the Sub-Earth L 98-59 b
Evidence for a Volcanic Atmosphere on the Sub-Earth L 98-59 b Open
Assessing the prevalence of atmospheres on rocky planets around M-dwarf stars is a top priority of exoplanet science. High-energy activity from M dwarfs can destroy the atmospheres of these planets, which could explain the lack of atmosphe…
View article: JWST observations of the cornerstone temperate sub-Neptune K2-18 b
JWST observations of the cornerstone temperate sub-Neptune K2-18 b Open
Earth-temperature, sub-Neptune-sized exoplanets are now within reach for detailed atmospheric characterization with JWST, with K2-18 b being one of the first to receive repeated observations. The initial observations revealed abundant CH₄ …
View article: Updated Mass, Eccentricity, and Tidal Heating Constraints for the Earth-sized Planet LP 791-18 d
Updated Mass, Eccentricity, and Tidal Heating Constraints for the Earth-sized Planet LP 791-18 d Open
LP 791-18 d is a temperate Earth-sized planet ( R P = 1.03 R ⊕ , P = 2.76 days) orbiting a late M dwarf, with an interior super-Earth (LP 791-18 b, R P = 1.2 R ⊕ , P = 0.95 days) and an exterior sub-Neptune (LP 791-18 c, R P = 2.5 R ⊕ , P …
View article: Detecting Surface Liquid Water on Exoplanets
Detecting Surface Liquid Water on Exoplanets Open
Planets with large bodies of water on their surface will have more temperate and stable climates, and such planets are the ideal places for life-as-we-know-it to arise and evolve. A key science case for the Habitable Worlds Observatory (HW…
View article: Population-level Hypothesis Testing with Rocky Planet Emission Data: A Tentative Trend in the Brightness Temperatures of M-Earths
Population-level Hypothesis Testing with Rocky Planet Emission Data: A Tentative Trend in the Brightness Temperatures of M-Earths Open
Determining which rocky exoplanets have atmospheres, and why, is a key goal for the James Webb Space Telescope. So far, emission observations of individual rocky exoplanets orbiting M stars (M-Earths) have not provided definitive evidence …
View article: Water-absorbing bags for high-altitude aerial firefighting: Mathematical modeling and drop pattern analysis
Water-absorbing bags for high-altitude aerial firefighting: Mathematical modeling and drop pattern analysis Open
Firefighting aircraft are highly effective against forest fires, but hazardous low-altitude operations often lead to accidents. Increasing the flight altitude is an effective way to enhance flight safety; however, a higher dropping altitud…
View article: The James Webb Space Telescope NIRSpec-PRISM Transmission Spectrum of the Super-Puff, Kepler-51d
The James Webb Space Telescope NIRSpec-PRISM Transmission Spectrum of the Super-Puff, Kepler-51d Open
Kepler-51 is a 500 Myr G dwarf hosting three "super-puffs" and one low-mass non-transiting planet. Kepler-51d, the coolest (T_eq ~ 350 K) transiting planet in this system, is also one of the lowest density super-puffs known to date (rho_p …
View article: A Preliminary Search for Planets and Exozodiacal Emission Around <i>α</i> Centauri A with JWST/MIRI
A Preliminary Search for Planets and Exozodiacal Emission Around <i>α</i> Centauri A with JWST/MIRI Open
We present F1550C (15.5 μ m) coronagraphic imaging observations of the nearest solar-type star α Cen A using the James Webb Space Telescope (JWST) Mid-InfraRed Instrument (MIRI). The observations, executed in 2025 February, were compromise…
View article: Tidally Heated Sub-Neptunes, Refined Planetary Compositions, and Confirmation of a Third Planet in the TOI-1266 System
Tidally Heated Sub-Neptunes, Refined Planetary Compositions, and Confirmation of a Third Planet in the TOI-1266 System Open
TOI-1266 is a benchmark system of two temperate ( ), and combine the TTVs with archival radial velocity measurements to improve our knowledge of the planetary masses and radii. We find that, consistent with previous studies, TOI-12…
View article: TOI-6324 b: An Earth-mass Ultra-short-period Planet Transiting a Nearby M Dwarf
TOI-6324 b: An Earth-mass Ultra-short-period Planet Transiting a Nearby M Dwarf Open
We report the confirmation of TOI-6324 b, an Earth-sized (1.059 ± 0.041 R ⊕ ) ultra-short-period (USP) planet orbiting a nearby (∼20 pc) M dwarf. Using the newly commissioned Keck Planet Finder spectrograph, we have measured the mass of TO…
View article: An Oxidation Gradient Straddling the Small Planet Radius Valley
An Oxidation Gradient Straddling the Small Planet Radius Valley Open
We present a population-level view of volatile gas species (H 2 , He, H 2 O, O 2 , CO, CO 2 , CH 4 ) distribution during the sub-Neptune to rocky planet transition, revealing in detail the dynamic nature of small planet atmospheric composi…
View article: The Transmission Spectrum of the Potentially Rocky Planet L 98-59 c
The Transmission Spectrum of the Potentially Rocky Planet L 98-59 c Open
We present observations of the 1.35 ± 0.07 Earth radius planet L 98-59 c, collected using Wide Field Camera 3 on the Hubble Space Telescope (HST). L 98-59 is a nearby (10.6 pc), bright ( H = 7.4 mag) M3V star that harbors three small, tran…
View article: Characterising the atmosphere of 55 Cancri e
Characterising the atmosphere of 55 Cancri e Open
Recent JWST observations with NIRCam and MIRI of the ultra-short-period super-Earth 55 Cancri e indicate a possible volatile atmosphere surrounding the planet. Previous analysis of the NIRCam spectra suggested potential absorption features…
View article: Characterising the Atmosphere of 55 Cancri e: 1D Forward Model Grid for Current and Future JWST Observations
Characterising the Atmosphere of 55 Cancri e: 1D Forward Model Grid for Current and Future JWST Observations Open
Recent JWST observations with NIRCam and MIRI of the ultra-short-period super-Earth 55 Cancri e indicate a possible volatile atmosphere surrounding the planet. Previous analysis of the NIRCam spectra suggested potential absorption features…
View article: Research on Soil Inorganic Nitrogen Detection Technology Based on Dielectric Response
Research on Soil Inorganic Nitrogen Detection Technology Based on Dielectric Response Open
Efficient monitoring of soil inorganic nitrogen is crucial for precision agriculture fertilization and ecological environmental protection. Traditional detection methods are complex and challenging for real-time in situ measurements. This …
View article: A New Spectral Library for Modeling the Surfaces of Hot, Rocky Exoplanets
A New Spectral Library for Modeling the Surfaces of Hot, Rocky Exoplanets Open
JWST’s MIRI LRS provides the first opportunity to spectroscopically characterize the surface compositions of close-in terrestrial exoplanets. Models for the bare-rock spectra of these planets often utilize a spectral library from R. Hu et …
View article: Modelling research on the drop pattern of the aerial firefighting system
Modelling research on the drop pattern of the aerial firefighting system Open
The drop pattern of firefighting aircraft directly affects their firefighting effectiveness, which is crucial for assessing their operational performance. When a firefighting aircraft sprays retardant from a high altitude, the physical for…
View article: Experimental study on evaporation characteristics of fire-extinguishing agent droplets in a thermal convection environment
Experimental study on evaporation characteristics of fire-extinguishing agent droplets in a thermal convection environment Open
Forest fires are highly destructive, and aerial firefighting aircraft are widely recognized as the safest and most efficient means of fire suppression. Under the combined influence of high-altitude wind fields and ground fire conditions, f…
View article: Knowledge, attitudes and practices of <scp>ICU</scp> nurses regarding postextubation dysphagia in tracheal intubation patients in 25 hospitals in China: A multicentre cross‐sectional survey
Knowledge, attitudes and practices of <span>ICU</span> nurses regarding postextubation dysphagia in tracheal intubation patients in 25 hospitals in China: A multicentre cross‐sectional survey Open
Background Postextubation dysphagia is common in the ICU, with varying incidence rates. However, few studies have focused on ICU nurses' knowledge, attitudes and practices regarding postextubation dysphagia, as well as the various influenc…
View article: TOI-6324b: An Earth-Mass Ultra-Short-Period Planet Transiting a Nearby M Dwarf
TOI-6324b: An Earth-Mass Ultra-Short-Period Planet Transiting a Nearby M Dwarf Open
We report the confirmation of TOI-6324 b, an Earth-sized (1.059 $\pm$ 0.041 R$_\oplus$) ultra-short-period (USP) planet orbiting a nearby ($\sim$20 pc) M dwarf. Using the newly commissioned Keck Planet Finder (KPF) spectrograph, we have me…