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Drawing on a developmental psychopathology perspective and research documenting gender differences in social tasks and structures of friendships, this study uses longitudinal social network analysis (SNA) methods to (a) examine how fear of negative evaluation (FNE) and gender interact to shape friendship dynamics and (b) characterize their distinct roles in how adolescents make new friends, keep existing friends, and become similar to one another over time. Participants were 1,034 sixth through eighth grade students from an ethnically diverse middle school who were assessed in the Fall and Spring of the same academic year. Results showed that girls were more likely to make new friends and maintain existing friendships when they had lower levels of FNE. Conversely, boys were more likely to make new friends and keep existing friends when they had higher levels of FNE. Additionally, girls with low levels of FNE were more likely to maintain friendships with others who also had low FNE levels, whereas boys with high levels of FNE were more likely to maintain friendships with friends who had low levels of FNE. Results also showed significant peer influence effects on FNE such that over time friends became similar to one another on their FNE levels, with no significant gender differences in these processes. The study underscored that FNE appeared to amplify gender differences in how adolescents tend to make and maintain their friendship networks, yet peer influence on FNE levels remained of the same strength for boys and girls. Impact and ImplicationsThis study suggests that fear of negative evaluation has a distinct impact on how adolescent boys and girls make new friends, keep existing ones, and influence one another. The findings highlight the importance of considering gendered social tasks in evaluating friendship and psychological adjustment in school-aged youth. Given that friendships are associated with fostering psychological adjustment and academic success, results indicate that the association between friendship and academic outcomes is especially important to consider for girls with heightened levels of fear of negative evaluation.

Abstract:There is increasing interest in using pyrogenic carbon as an adsorbent for aqueous contaminants in stormwater. The objective of this study was to investigate pyrogenic carbon materials as an amendment to geomedia to reduce nitrate leaching. Batch adsorption and column experiments were conducted to evaluate the performance of a commercial activated carbon and two biochars incorporated (5% by weight) into sand and pumice columns. The batch adsorption with 50 mg L −1 of nitrate solution showed that only activated carbon resulted in a substantial adsorption for nitrate up to 41%. Tested biochars were not effective in removing aqueous nitrate and even released nitrate (<1%) with 1 h reaction time. Column experiment with a pulse input of nitrate solution (50 mg L −1 ) confirmed that the sand or pumice columns amended with biochars were not as effective as those amended with activated carbon for reducing nitrate leaching. Our results suggested that net negatively charged surfaces of biochar may inhibit nitrate anion adsorption while activated carbon has reactive sites containing acidic functional groups to improve nitrate retention. There was no difference between sand and pumice for nitrate retention in any of the carbon amendments. Additional surface activation process during biochar production may be needed to improve adsorptive capacity of biochar for aqueous nitrate removal.

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