New Publications In PAMS

Analyzing 328 hot Jupiters with causal-discovery methods, the authors find that planetary radius is directly associated with orbital period and stellar temperature, but not mass, supporting irradiation-regulated inflation. Gold–Soter thermal tides best match the observed pattern, though mechanical heating and ohmic dissipation may contribute; purely gravitational tides are unlikely to be the sole cause. Further studies controlling for age, composition, incident flux, and selection effects are needed to distinguish among these mechanisms. 

Descriptors are investigated by varying nitrogen concentration and evaluating the electronic, mechanical, and thermodynamic properties using of high-entropy carbonitrides HEC1-xNx (0 ≤ x ≤ 1) using density functional theory calculations. Although valence electron concentration (VEC) captures general trends in electronic and mechanical properties, bond-polarity descriptors show stronger correlation with the HECN’s formation enthalpy. Thus, property-specific descriptors enable more effective rational design of high-entropy ceramics.

Nickel-Zinc (Ni-Zn) batteries are promising but suffer from capacity loss and energy reduction due to electrode shape-change and internal gas production. To address this, a computational model and a mass spectrometry sampling method were developed to track hydrogen and oxygen generation during battery cycling. The study successfully demonstrated that an internal platinum recombination catalyst mitigates gas pressure increases, stabilizing battery operation.

In this work, we analyzed tens of cool pulsating stars and established their variability class, along with a full frequency solution. We used standard tools to look for any evidence of the mode identification. Finally, we applied an asteroseismic relation to derive the mass of the stars in this work.

First-principles calculations and experimental validations were used to demonstrate that the valence electron concentration (VEC) descriptor provides self-consistent parameterization of the bonding characteristics of high-entropy diborides (HEBs) and successfully predicts their mechanical properties. Hardness measurements of our HEBs reveal agreement between theory and experiment. An HEB with VEC of 10.0/formula-unit shows superhard characteristics, with a hardness greater than 40 GPa. Our VEC + entropy design formulation establishes a foundation for the discovery of high-entropy ceramics with enhanced thermo-mechanical properties.