58622 research outputs found
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Synergistic Fe–O–Ni bridged sites in layered double hydroxides boost electrocatalytic oxidation of glycerol to formate coupled with hydrogen evolution
Full text linkElectrochemical glycerol oxidation (GOR) to formate emerges as a highly promising and cost-effective approach for biomass valorization. However, the formate yield and selectivity are predominantly hindered by the slow kinetics in successive dehydrogenation and C–C bond cleavage of glycerol. Herein, we demonstrate an enhanced electrochemical GOR over Fe–O–Ni bridged sites in layered double hydroxides (LDHs), which couples charge transfer with adsorption/activation of *OH/glycerol. Engineered from a facile electrochemical deposition approach, NiFe-LDH is successfully constructed on Ni-foam. This catalyst with Fe–O–Ni bridged sites delivers formate selectivity of 92.26 % and yield of 67.76 mol m–2 h–1, outperforming most of the reported GOR electrocatalysts in the literature. The Fe–O–Ni bridged sites facilitate the electron transfer from Ni to Fe and boost the redox reaction between Ni3+ and glycerol while synergistically enhancing the adsorption and activation of *OH and glycerol, which improves dynamics in successive dehydrogenation and C-C cleavage of glycerol. Moreover, the membrane electrode assembly (MEA) flow cell employing NiFe-LDH@NF as both anode and cathode exhibits a current density of 100 mA cm–2 for a stable 120 h, demonstrating potential applications for electrooxidation of glycerol to formate coupled with H2 production. This study pioneers a new strategy of designing highly efficient electrocatalysts for advancing biomass valorization and sustainable energy conversion.</p
Parental and Adolescent Positive Affect and Optimism as Predictors of Post-surgical Mood and Functioning in Adolescents Undergoing Spinal Fusion Surgery
Full text linkObjectives: – While most adolescents display a steady recovery trajectory following surgery, some develop chronic postsurgical pain (CPP), which can significantly impact their functioning. Psychosocial factors are known to play a role in the recovery from pain following surgery, but positive psychosocial factors have received little attention in the literature. This study aims to address this gap by investigating parental and adolescent positive affect and optimism as predictors of post-surgical pain recovery and positive outcomes in adolescents. Methods: – This study uses data collected as part of a larger longitudinal project that involved administering questionnaires to adolescents and their parents over multiple timepoints. Adolescent participants aged 12 – 18 years old with a diagnosis of Adolescent Idiopathic Scoliosis, and scheduled for spinal fusion surgery, were recruited across four Belgian hospitals along with their parents. Structural Equation Modelling was used to investigate how parental and adolescent positive affect and optimism predicted post-surgical outcomes, including mood, quality of life and functional disability in adolescents. Results: – The study comprised 94 adolescent-parent dyads. Parental optimism before surgery predicted increased adolescent mood following surgery. Adolescent positive affect before surgery predicted increased mood and decreased pain intensity following surgery, while adolescent optimism predicted increased quality of life. None of the optimism or positive affect variables were significantly related to adolescent functional disability following surgery. Discussion: – Study findings identify parental and adolescent positive affect and optimism as potential predictors of post-surgical recovery and positive outcomes in adolescents. However, the multifaceted and complex nature of these relationships warrants further investigation.</p
Synergistic Fe–O–Ni bridged sites in layered double hydroxides boost electrocatalytic oxidation of glycerol to formate coupled with hydrogen evolution
Full text linkElectrochemical glycerol oxidation (GOR) to formate emerges as a highly promising and cost-effective approach for biomass valorization. However, the formate yield and selectivity are predominantly hindered by the slow kinetics in successive dehydrogenation and C–C bond cleavage of glycerol. Herein, we demonstrate an enhanced electrochemical GOR over Fe–O–Ni bridged sites in layered double hydroxides (LDHs), which couples charge transfer with adsorption/activation of *OH/glycerol. Engineered from a facile electrochemical deposition approach, NiFe-LDH is successfully constructed on Ni-foam. This catalyst with Fe–O–Ni bridged sites delivers formate selectivity of 92.26 % and yield of 67.76 mol m–2 h–1, outperforming most of the reported GOR electrocatalysts in the literature. The Fe–O–Ni bridged sites facilitate the electron transfer from Ni to Fe and boost the redox reaction between Ni3+ and glycerol while synergistically enhancing the adsorption and activation of *OH and glycerol, which improves dynamics in successive dehydrogenation and C-C cleavage of glycerol. Moreover, the membrane electrode assembly (MEA) flow cell employing NiFe-LDH@NF as both anode and cathode exhibits a current density of 100 mA cm–2 for a stable 120 h, demonstrating potential applications for electrooxidation of glycerol to formate coupled with H2 production. This study pioneers a new strategy of designing highly efficient electrocatalysts for advancing biomass valorization and sustainable energy conversion.</p
Afraid to Be Vulnerable?:Women, Leadership, and the Constructive Role of Vulnerability for Organizations
Full text linkThis article draws attention to the value, for leaders and organizations, of recognizing and working with vulnerability. In the opening, we mobilize the “writing differently” approach. Specifically, we present a poem co-written by the authors to sensitize ourselves and readers to the importance of acknowledging and embracing vulnerability, which we view as an existential condition and an inherent aspect of the leadership experience. We then discuss insights from our qualitative study, based on photo-elicitation interviews with thirty-five senior women leaders in Poland, highlighting the role of vulnerability in their experiences and practices. Our research suggests that, in response to organizational norms that often discourage the expression of emotions and the display of vulnerability, especially by leaders, women leaders consciously manage and even suppress their sense of vulnerability. We argue that embracing vulnerability can bring much more positive outcomes for individuals and organizations. The article concludes with practice-oriented implications for leaders, organizations, and researchers, promoting a more sustainable and integrated approach to vulnerability in professional life
A Critical Examination of the Life in the UK Test and ESOL Programmes: Perspectives of Migrants and Refugees
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Effective acid recovery from rare earth stripping solution by diffusion dialysis
Full text linkThe consumption of substantial alkali and emission of high-salinity wastewater during the precipitation step of stripping solutions in rare earth (RE) element extraction processes remain critical challenges. This study proposes an energy-efficient and environmentally benign diffusion dialysis (DD) process for separating H+ and rare earth ions (RE3+) in simulated rare earth stripping solutions. Six commercial anion exchange membranes (AEMs) were first evaluated for separating RECl3/HCl mixtures. The dense AEM with single polyethylene terephthalate string structure (M6) demonstrated the optimal DD performance for H+ and RE3+ separation. Among three typical RE3+ ions with different radii (i.e., Y3+, La3+, and Yb3+), the M6 AEM exhibited the lowest selectivity between H+ and La3+, which is correlated with the higher tendency of La3+ hydrated ions to dehydrate during transmembrane transfer. Under optimized operation conditions (feed solution: 0.2 mol L−1 HCl and 0.25 mol L−1 La3+), the DD process using the M6 AEM achieved an H+ recovery rate of 69.77 % and a La3+ leakage rate of 0.05769 % with a H+/La3+ selectivity of 5519.2. Importantly, the M6 AEM maintained consistently stable DD performance for separation of H+ and RE3+ ions over a 30-cycle consecutive operation in the stimulated rare earth stripping solution containing typical organic pollutants (i.e., P507 and sulfonated kerosene), showing an impressive antifouling property. This study provides an insightful guideline for practical acid recovery from the rare earth stripping solutions.</p
A review on energy harvesting for sustainable IoT monitoring systems
Full text linkAutonomous condition monitoring is essential for advancing intelligent systems in both industrial and domestic Internet of Things (IoT) applications. However, continuous long-term condition monitoring is challenged by the limited energy availability for wireless sensor nodes (WSNs). Therefore, energy harvesting offers a promising approach by converting ambient or host energy into electrical power to sustain WSN operation. To bridge the gap between energy harvesting and condition monitoring, this review provides an overview and synthesis of recent advances in energy harvesting technologies tailored for condition monitoring applications. State-of-the-art developments in energy harvesting are categorized into six domains: healthcare, ocean, machinery, grid, railway, and infrastructure. The characteristics of these energy sources and their domain-specific monitoring requirements are analyzed. Furthermore, this review examines harvesting transducers, structural designs, and optimization methods employed in energy harvesters. Finally, the review discusses current challenges and future prospects for energy-autonomous condition monitoring systems, aiming to support the deployment of sustainable IoT sensing solutions.</p
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