Hydrogen Evolution Reaction in Borophene: Puckering Mechanism and the Role of Coordination Number.

Using the free energy of hydrogen adsorption (Δ ) as the indicator, five borophene phases are previously shown to possess high catalytic activity for the hydrogen evolution reaction (HER). On these borophene phases, we investigate the role of the coordination number (CN = 4, 5, 6) of the adsorption sites and the puckering of the adsorption site. CN is discovered to have a profound effect on the Δ distribution, charge, and puckering height () of adsorption sites.

Gait speed assessment in confined spaces: Development of a novel automated 4-m static-start test to measure dynamic-start gait speed.

Objectives: To promote standardization and feasible measurements of gait speed across the field, we developed a device that used light detection and ranging (LiDAR) technology to measure gait speed from a standing-start testing procedure conducted on a 4-m total walkway. We compared this automated (LiDAR-based) standing-start 4-m gait speed test (AS-4MG) with automated and manual (stopwatch-based) dynamic-start 4-m gait speed tests (AD-4MG and MD-4MG, respectively) on between-method agreement, measurement repeatability, and predictive validity with functional outcomes.

Methods: A sample of 48 community-dwelling adults (mean [SD], 69 [9] years) participated in this method comparison study.

Correlation of the Radiographic Grading of Knee Osteoarthritis With Physical Function but Not Emotional Quality of Life Scores.

Background Multiple studies have shown that symptoms of knee osteoarthritis (OA) weakly correlate with the radiographic severity of the disease. Our objective was to determine possible correlations between the radiographic severity of knee OA and clinical manifestations such as disability, pain scores, and emotional health. Methods A retrospective review of registry data of 305 patients with knee OA was collected.

Life space restriction following disruptive life events: Evidence from the COVID-19 pandemic.

Objectives: Restriction of life space mobility is associated with adverse health outcomes including depression, morbidity, mortality and poorer quality of life. In this study, we aimed to determine the impact of COVID-19 and associated employment loss on the life space of older adults in Singapore.

Methods: An in-person survey was administered to a cohort of older Singaporeans above 50 years old (N = 1,118).