Aging iridium oxide catalyst inks: a formulation strategy to enhance ink processability for polymer electrolyte membrane water electrolyzers.

Iridium oxide (IrO) is recognized as a state-of-art catalyst for anodes of low-temperature polymer-electrolyte membrane water electrolyzers (PEMWE), one of the promising clean energy technologies to produce hydrogen, a critical energy carrier for decarbonization. However, typical IrO ink formulations are challenging to process in liquid-film coating processes because of their poor stability against gravitational settling and low viscosities. Here we report on time evolution of the microstructure of concentrated IrO inks in a water-rich dispersion medium, probed using a combination of rheology and X-ray scattering for up to four days.

Treatment decision and estimation of growth of head and neck paragangliomas.

Purpose: Head and neck paragangliomas are slow growing tumors where observation has become more widely accepted. Tumor growth rate as well as predictors of increased tumor growth were analyzed with the goal to identify factors to better predict disease progression and counsel patients.

Materials And Methods: Multi-institutional retrospective cohort study from 2011 to 2020.

Who attends a crisis pregnancy center in Ohio?

Objectives: We sought to quantify the prevalence of ever attendance at a crisis pregnancy center (CPC) among adult, reproductive-age women in Ohio and identify demographic factors associated with ever attendance.

Study Design: We analyzed data from the Ohio Survey of Women, a survey of adult, reproductive-age women (N = 2529) conducted in 2018 to 2019. We calculated unadjusted and adjusted prevalence ratios (PRs) to evaluate the possible associations between demographic factors and ever CPC attendance.