Ultrafast Electron Dynamics in Coupled and Uncoupled HgTe Quantum Dots.

In this article, we study electron dynamics in HgTe quantum dots with a 1.9 μm gap, a material relevant for infrared sensing and emission, using ultrafast spectroscopy with 35 fs time resolution. Experiments have been carried out at several probing photon energies around the gap, which allows us to follow the relaxation path of the photoexcited electrons.

Supporting knowledge justice through community science air quality monitoring and a reciprocal reporting process.

In community science on air quality, low-cost air monitors have emerged as an opportunity to democratize data reporting and support knowledge justice by providing participants with instantaneous access to air quality data. In this study, we equipped residents in four environmental justice communities in North Denver with low-cost air monitors to collect real-time air quality data for four separate 30-day field deployments over two years. We conceptualize an improvement to conventional report-back processes by suggesting a 3-part approach - a reciprocal reporting process that includes 1) bidirectional open channels of communication with participants, 2) democratized data access via instant monitor data and written data summaries, and 3) responsive intervention opportunities to respond in real-time to participants air quality concerns.

Efficient Lithium Recovery from Water Using Polyamide Thin-Film Nanocomposite (TFN) Membrane Modified with Positively Charged Silica Nanoparticles.

The separation of Li from Mg in salt-lake brines using nanofiltration (NF) has become the most popular solution to meet the rising demand for lithium, particularly driven by the extensive use of lithium-ion batteries. This study presents the fabrication of a uniquely designed polyamide (PA) thin-film nanocomposite (TFN) membranes with ultrahigh Li/Mg selectivity and enhanced water flux by covalently incorporating mixed ligands functionalized silica nanoparticles (F-SiONPs) into the selective PA layer and covalently bonding them to the membrane surface. In this strategy, bare silica nanoparticles (SiONPs) were functionalized with mixed superhydrophilic ligands, including primary amine and quaternary ammonium groups, resulting in a highly positive surface charge primarily from the quaternary ammonium groups and enabling covalent conjugation via amine groups.

Effect of resilience training in improving the ability to cope with stress and hope of mothers with cancer children.

Background: The present study investigates the effect of resilience training in improving the ability to cope with stress and hope of mothers with cancer children.

Methods: In this interventional study, 70 mothers parenting children with cancer were selected as available and randomly classified into the control and experimental groups. The mothers of the two groups completed the parenting stress and hope questionnaire.