ABSTRACT
INTRODUCTION: Nonsuicidal self-injury (NSSI) is a pervasive public health problem among adolescents. Self-criticism has been identified as an important risk factor for NSSI. Potential mediators of the relationship between self-criticism and NSSI and potential moderators that may exacerbate or buffer this association, however, have seldom been explored. The current study tested the mediating effect of hopelessness and the moderating effect of rumination. METHODS: 915 Chinese participants (405 girls; mean ageâ¯=â¯15.85, SDâ¯=â¯1.47) were recruited from junior and senior high schools. They completed questionnaires regarding self-criticism, hopelessness, rumination, and NSSI. RESULTS: Self-criticism was significantly associated with NSSI, and this association was mediated by hopelessness. Rumination strengthened the association between self-criticism and hopelessness, as well as the association between hopelessness and NSSI. CONCLUSIONS: Although this study is a cross-sectional design, these findings can help researchers and practitioners understand the relationship among self-criticism, hopelessness, rumination, and NSSI. Moreover, implications for preventions and interventions of NSSI were discussed.
Subject(s)
Rumination, Cognitive , Self Concept , Self-Assessment , Self-Injurious Behavior/psychology , Adolescent , Affect , Cross-Sectional Studies , Female , Hope , Humans , Male , Risk Factors , Self-Injurious Behavior/etiology , Surveys and QuestionnairesABSTRACT
Nonsuicidal self-injury (NSSI) is a serious public health concern among adolescents. Identifying risk factors of NSSI is important to effectively prevent or reduce such behavior. Child maltreatment is one of the most widely recognized risk factors for NSSI. How child maltreatment and NSSI is related, however, is still unclear. The present study tested the temporal relationship between physical and emotional abuse and NSSI, with distress intolerance as the potential mediator. Potential gender differences on these associations were also tested. We assessed all study variables among 2259 Chinese adolescents (53.8% females; Mage = 15.11 years, SD = 1.57) for three times at 6-month intervals. The results showed that distress intolerance only mediated the relationship between emotional abuse and NSSI, but not between physical abuse and NSSI. In addition, this mediation effect of distress intolerance was significant only for females. The findings of this study can help researchers and practitioners understand pathways by which child maltreatment impacts adolescent NSSI. Implications for preventions and interventions of NSSI were discussed.
Subject(s)
Adolescent Behavior/psychology , Child Abuse/psychology , Self-Injurious Behavior/psychology , Stress, Psychological/complications , Adolescent , Asian People/psychology , Child , Female , Humans , Longitudinal Studies , Male , Risk Factors , Self-Injurious Behavior/etiology , Stress, Psychological/psychology , Young AdultABSTRACT
We demonstrate an extension of a UV-Vis spectroscopy method to determine the phase boundaries for thermosensitive colloids as an alternative to the time-consuming sedimentation method. The Bragg attenuation peak from colloidal crystallites was monitored during the quasi-equilibrium colloidal crystal melting. The melting and freezing boundaries of the coexistence region were determined via a blue shift of Bragg's peak and the disappearance of peak area. We confirm this method using poly(N-isopropylacrylamide) (PNIPAM) particles at different charge densities and temperatures far below the lower critical solution temperature. At low pH, the particles behave as thermosensitive hard spheres.
ABSTRACT
An emulsion crystallization method has been demonstrated to measure the nucleation rate of a thermoresponsive colloidal poly-N-isopropylacrylamide (PNIPAM) system. The colloidal PNIPAM suspension was injected into a microfluidic flow-focusing device to generate monodispersed droplets in oil. The temperature was controlled to fine tune the volume fraction of the PNIPAM particles, and the microfluidic flow rate was varied to change the droplet sizes, thus altering the nucleation volume. Using independent droplets, we can isolate the nucleation events to eliminate the interactions among crystallites that existed in bulk or large droplet systems. Therefore, we were able to carry out accurate nucleation rate measurements of colloidal crystals. This emulsion crystallization method is promising for bridging the gap among theories, simulations, and experiments for nucleation kinetics studies.
