Journal Articles

Recent research has focused on Mn-ion batteries (MIBs) and their associated operations to prepare these batteries for stationary energy storage. The features of MIBs could be defined by establishing a steady Mn2+ storage cathode, which is necessary for understanding their practical challenges. In this study, a Na1.25V3O8 (NVO) cathode prepared by the sol–gel technique with a large interlayer spacing was used as an Mn2+ storage host in two different electrolytes (1 M Mn(ClO4)2 (MC) and 1 M MnSO4 (MS)). The MC electrolyte with stable charge transfer kinetics exhibited better electrochemical performance than the MS electrolyte. Theoretical analyses support that the semiconducting NVO cathode becomes conducting when Mn ions are intercalated into the structure, which helps to understand the stable Mn2+ storage properties in a coin-cell configuration.

In addressing the key role that problem solving has been playing in mathematics instruction for K-12, this paper aims to assist mathematics teachers and educators to consider a set of guiding principles for designing problem solving tasks for classroom instructions. The set of guiding principles was synthesized and proposed through the researchers’ systematic review of existing education literature on problem solving.

Wastewater treatment recycling is critical to ensure safe water supply or to overcome water shortage. Herein, we developed metallic Co integration onto MnO nanorods (MON) resulting in a phase-separated synergetic catalyst by creating more Mn(III) via the Jahn–Teller effect and oxygen vacancies and improving the redox capability of Co nanoparticles mediated by a thin carbon layer. Additionally, the N-doped surface carbon network on MON contributes to polar sites, facilitating the enrichment of contaminants around reactive sites, thereby shortening the migration of reactive oxidative species (ROS) toward contaminants. The optimized MnO@Co/C-600 exhibits superior PMS activation efficiency for bisphenol A degradation (0.463 min−1), displaying nearly a 20-fold enhancement in the rate constant compared to Mn3O4/C-600. Subsequent experiments involving variable modulation and extension were conducted to further elucidate the multiple synergistic effects. The mechanism study further confirms the synergy of ˙SO4−, ˙OH, ˙O2−, and 1O2, along with additional electron transfer pathways. The intermediates generated during degradation pathways and their toxicity to aquatic organisms were identified. Notably, a monolith integrated catalyst was explored by anchoring MnO@Co/C-600 onto a tailored melamine sponge based on Ca ion triggered crosslink tactic for the photothermal degradation of bisphenol A, tetracycline and norfloxacin, endowed with easy recovery and good stability. Furthermore, we demonstrated that the total organic carbon removal of multiple contaminants surpassed that of sole contaminants.

The use of a screening tool for school-wide screening of internalizing symptoms is an important strategy for early identification and prevention of more serious and impairing emotional and behavioral health problems in adolescents. However, threshold cut-off scores determined for screening tools may not be suitable for all populations. Using a sample of 237 Singaporean secondary school students, this study validated the Youth Internalizing Problems Screener (YIPS) for local use. Results of confirmatory factor analyses supported a one-factor solution for the construct. A threshold cut-off score of 27 was found to show good classification accuracy based on receiver operating characteristics (ROC) analyses. Correlational and path analyses provided evidence of convergent and predictive validity for using YIPS to indicate at-risk status. The YIPS status was uniquely associated with girls’ sense of school well-being over and above the nature of their interpersonal relationships and their sense of inadequacy. Overall, YIPS demonstrated comparable sensitivity and specificity rates even though a different cut-off score was used for this study sample. The use of YIPS as a screening tool in a multitier system of support and directions for future development were discussed.

Over the past decade, a robust body of scholarship on microcelebrity has emerged, occasioning several review studies of this growing field of research. Extant reviews on microcelebrity have mostly focused on microcelebrities’ strategic communication or audiences’ attitudes, but no review has specifically focused on microcelebrities’ identity. Echoing the call for more attention to this particular aspect in recent reviews, this article examines 97 empirical studies published from 2010 to 2022 that focused on microcelebrities’ identity construction on social media. Our analysis identified various research trends and synthesized microcelebrities’ identity tactics into 10 categories. We situate the findings within current discussions of platformized cultural production and microcelebrity’s role in it by drawing on and extending Duffy et al.’s ‘nested precarities’ framework to account for microcelebrities’ identity work on social media. The review’s key contribution is the conceptualization of microcelebrities’ identity-related tactics and its embedding in the formidable precarities of platform ecosystems.