Fabrication of CP-Ti structure with controllable wettability using powder bed fusion and eco-friendly post-process.

Hydrophobic surfaces have a wide range of applications, such as water harvesting, self-cleaning, and anti-biofouling. However, traditional methods of achieving hydrophobicity often involve the use of toxic materials such as fluoropolymers. This study aims to create controllable wettability surfaces with a three-dimensional geometry using a laser base powder bed fusion (PBF) process with commercially pure titanium (CP-Ti) and silicone oil as non-toxic materials. The optimal PBF process parameters for fabricating micropillar structures, which are critical for obtaining the surface roughness necessary for achieving hydrophobic properties, were investigated experimentally. After fabricating the micropillar structures using PBF, their surface energy was reduced by treatment with silicone oil. Silicone oil provides a low-surface-energy coating that contributes to the water-repellent nature of hydrophobic surfaces. The wettability of the treated CP-Ti surfaces was evaluated based on the diameter of the pillars and the space between them. The structure with the optimal diameter and spacing of micropillars exhibited a high contact angle (156.15°). A pronounced petal effect (sliding angle of 25.9°) was achieved because of the morphology of the pillars, indicating the controllability of wetting. The micropillar diameter, spacing, and silicone oil played crucial roles in determining the water contact and sliding angle, which are key metrics for surface wettability.

Changes in children's attachment security to mother and father after the birth of a sibling: Risk and resilience in the family.

Changes in children's attachment security to mother and father were examined for 230 firstborn children (M = 31.17 months), their mothers and fathers participating in a longitudinal investigation starting in the last trimester of the mothers' pregnancy and 1, 4, 8, and 12 months after the birth of an infant sibling. Both parents completed the Attachment Q-set at prenatal, 4, and 12 months. Growth mixture models revealed four latent classes in which children's attachments were (a) both secure with a modest decline to both parents (68.3%); (b) more secure with father than mother with a steep decline for both (12.6%); (c) both insecure with no change (10%); and (d) more secure with mother than father with a modest increase for both (9.1%). Multi-group latent growth curve analyses revealed that parenting and coparenting differed across families. Children had lower externalizing behavior problems in families with two secure attachments than in families with one secure attachment, either to mother or to father, who, in turn, had fewer problems than children with two insecure attachments. Findings underscore the strengths of a family systems framework to understand attachment relationships with multiple caregivers and the family risks and protective factors that covary with children's behavioral adjustment after the birth of a sibling.

Mother-Infant Dyadic Synchrony in the NICU Context.

BACKGROUND: Dyadic synchrony is a co-constructed social process relating to the back and forth interactions between mothers and infants that are strongly associated with neurodevelopment, self-regulation, and attachment. In the neonatal intensive care unit (NICU), this process may become interrupted because of the physiological state of the infant, the emotional state of the mother, and the physical environment of the NICU. PURPOSE: In applying Feldman's Biobehavioral Model of Synchrony, this empirical review deconstructs the process of dyadic synchrony in the NICU context and provides a conceptual approach to guide both research and clinical practice. METHODS: First, we examine the theoretical and empirical literature to explicate the primary structural and biophysiological components of synchrony and relate these constructs to the extant research on premature infants. Next, we synthesize the maternal, infant, and contextual factors that facilitate or inhibit the ontogenesis of dyadic synchrony in the NICU. The final section highlights the state of the science in dyadic synchrony in the NICU including gaps and recommendations for future research. FINDINGS: An empirical review synthesis presents a visual conceptual framework to illustrate multiple processes that depict maternal, infant, and contextual influences of mother-infant synchrony in the NICU. IMPLICATIONS FOR PRACTICE/RESEARCH: Despite the challenges posed to mother-infant relationships in the NICU, high-quality mother-infant interactions are possible, dyadic synchrony can emerge, and premature infants can develop secure attachments. Clinicians and researchers can apply this conceptual framework of mother-infant dyadic synchrony in the NICU to promote evidence-based research and clinical practice.

Selection of effective manufacturing conditions for directed energy deposition process using machine learning methods.

In the directed energy deposition (DED) process, significant empirical testing is required to select the optimal process parameters. In this study, single-track experiments were conducted using laser power and scan speed as parameters in the DED process for titanium alloys. The results of the experiment confirmed that the deposited surface color appeared differently depending on the process parameters. Cross-sectional view, hardness, microstructure, and component analyses were performed according to the color data, and a color suitable for additive manufacturing was selected. Random forest (RF) and support vector machine multi-classification models were constructed by collecting surface color data from a titanium alloy deposited on a single track; the accuracies of the multi-classification models were compared. Validation experiments were performed under conditions that each model predicted differently. According to the results of the validation experiments, the RF multi-classification model was the most accurate.

Distinct Profiles of Relationships With Mothers, Fathers, and Best Friends and Social-Behavioral Functioning in Early Adolescence: A Cross-Cultural Study.

Adolescents' dyadic relationships are likely influenced by the cultural context within which they exist. This study applied a person-oriented approach to examine how perceived support and negativity were manifested across youths' relationships with mothers, fathers, and best friends, simultaneously, and how distinct relationship profiles were linked to adaptive and maladaptive functioning (aggression, anxious-withdrawal, prosociality) within and across cultures. Participants resided in metropolitan areas of South Korea, the United States, and Portugal (10-14 years; N = 1,233). Latent profile analyses identified relationship profiles that were culturally common or specific. Additional findings highlighted commonality in the relations between a high-quality relationship profile and adaptive functioning, as well as cultural specificity in the buffering and differential effects of distinct relationship profiles on social-behavioral outcomes.

Daily change patterns in mindfulness and psychological health: A pilot intervention.

OBJECTIVE: This study examined the differences in first-year college students' daily change trajectories in subjective happiness, depression, anxiety, stress, and state mindfulness. METHOD: A 5-day, online mindfulness-based intervention (MI) condition and stress management (SM) condition were employed in 247 first-year college students. RESULTS: Students in both the MI and SM conditions displayed similar significant linear declines in anxiety and stress, but there were significant differences between the two conditions, including: (1) the MI condition showing a significant linear increase in subjective happiness compared with no change in the SM condition and (2) the SM condition showed a significant linear decrease in depression compared to no significant change in the MI condition. CONCLUSION: Brief online interventions-whether MI or SM-can promote better mental health and reduce psychological distress. The results also lend support for MI's differential influence on first-year college students' happiness and SM's differential influence on their depression.

Developmental Outcomes of Late Preterm Infants From Infancy to Kindergarten.

OBJECTIVE: To compare developmental outcomes of late preterm infants (34-36 weeks' gestation) with infants born at early term (37-38 weeks' gestation) and term (39-41 weeks' gestation), from infancy through kindergarten. METHODS: Sample included 1000 late preterm, 1800 early term, and 3200 term infants ascertained from the Early Childhood Longitudinal Study, Birth Cohort. Direct assessments of development were performed at 9 and 24 months by using the Bayley Short Form-Research Edition T-scores and at preschool and kindergarten using the Early Childhood Longitudinal Study, Birth Cohort reading and mathematics θ scores. Maternal and infant characteristics were obtained from birth certificate data and parent questionnaires. After controlling for covariates, we compared mean developmental outcomes between late preterm and full-term groups in serial cross-sectional analyses at each timepoint using multilinear regression, with pairwise comparisons testing for group differences by gestational age categories. RESULTS: With covariates controlled at all timepoints, at 9 months late preterm infants demonstrated less optimal developmental outcomes (T = 47.31) compared with infants born early term (T = 49.12) and term (T = 50.09) (P < .0001). This association was not seen at 24 months, (P = .66) but reemerged at preschool. Late preterm infants demonstrated less optimal scores in preschool reading (P = .0006), preschool mathematics (P = .0014), and kindergarten reading (P = .0007) compared with infants born at term gestation. CONCLUSIONS: Although late preterm infants demonstrate comparable developmental outcomes to full-term infants (early term and full-term gestation) at 24 months, they demonstrate less optimal reading outcomes at preschool and kindergarten timepoints. Ongoing developmental surveillance for late preterm infants is warranted into preschool and kindergarten.

Comorbid trajectories of postpartum depression and PTSD among mothers with childhood trauma history: Course, predictors, processes and child adjustment.

BACKGROUND: Both postpartum depression and posttraumatic stress disorder (PTSD) have been identified as unique risk factors for poor maternal psychopathology. Little is known, however, regarding the longitudinal processes of co-occurring depression and PTSD among mothers with childhood adversity. The present study addressed this research gap by examining co-occurring postpartum depression and PTSD trajectories among mothers with childhood trauma history. METHODS: 177 mothers with childhood trauma history reported depression and PTSD symptoms at 4, 6, 12, 15 and 18 months postpartum, as well as individual (shame, posttraumatic cognitions, dissociation) and contextual (social support, childhood and postpartum trauma experiences) factors. RESULTS: Growth mixture modeling (GMM) identified three comorbid change patterns: The Resilient group (64%) showed the lowest levels of depression and PTSD that remained stable over time; the Vulnerable group (23%) displayed moderately high levels of comorbid depression and PTSD; and the Chronic High-Risk group (14%) showed the highest level of comorbid depression and PTSD. Further, a path model revealed that postpartum dissociation, negative posttraumatic cognitions, shame, as well as social support, and childhood and postpartum trauma experiences differentiated membership in the Chronic High-Risk and Vulnerable. Finally, we found that children of mothers in the Vulnerable group were reported as having more externalizing and total problem behaviors. LIMITATIONS: Generalizability is limited, given this is a sample of mothers with childhood trauma history and demographic risk. CONCLUSIONS: The results highlight the strong comorbidity of postpartum depression and PTSD among mothers with childhood trauma history, and also emphasize its aversive impact on the offspring.

Patterns of Marital Relationship Change across the Transition from One Child to Two.

Patterns of marital change after the birth of a second child were explored in a sample of 229 married couples, starting in pregnancy, and at 1, 4, 8 and 12 months postpartum. Five trajectory patterns that reflected sudden, persistent decline (i.e., crisis), sudden, short-term decline (i.e., adjustment and adaptation), sudden, short-term gain (i.e., honeymoon effect), linear change, and no change were examined with dyadic, longitudinal data for husbands and wives. Six distinct latent classes emerged using growth mixture modeling: (a) wife decreasing positivity-husband honeymoon (44%), (b) wife increasing conflict-husband adjustment and adaptation (34.5%), (c) wife honeymoon-discrepant spouse positivity (7.4%), (d) wife adjustment and adaptation (6.9%), (e) couple honeymoon with discrepant positivity and negativity (5.2%) and (f) husband adjustment and adaptation (1.7%). Classes were distinguished by individual vulnerabilities (i.e., depression, personality), stresses associated with the transition (i.e., unplanned pregnancy), and adaptive processes (i.e., marital communication, social support). Marital communication, parental depression, and social support emerged as important targets for intervention that can assist parents planning to have additional children.

Trajectories of children's social interactions with their infant sibling in the first year: a multidimensional approach.

Individual differences in longitudinal trajectories of children's social behaviors toward their infant sibling were examined simultaneously across multiple social dimensions: Positive engagement (moving toward), antagonism (moving against), and avoidance (moving away). Three distinct social patterns were identified: (C1) positively-engaged (n = 107, 50%); (C2) escalating-antagonism (n = 90, 42%); and (C3) early-onset antagonism (n = 16, 8%). Children in the positively-engaged class had high levels of positive engagement with their infant siblings, coupled with low levels of antagonism and avoidance. The escalating-antagonism class was positively-engaged in sibling interaction with a steep escalation in antagonistic behavior and avoidance from 4 to 12 months. Children in the early-onset antagonism class displayed the highest level of antagonistic behavior starting as early as 4 months, and became increasingly avoidant over time. A path model, guided by a Process × Person × Context × Time model, revealed that low parental self-efficacy heightened by parenting stress and children's dysregulated temperament was directly related to the escalating-antagonism pattern. Punitive parenting in response to children's antagonistic behavior increased the likelihood of being in the early-onset antagonism class. Together, the results highlighted heterogeneity in the earliest emergence of sibling interaction patterns and the interplay of child and parent factors in predicting distinct sibling interaction trajectory patterns.

Hush now baby: mothers' and fathers' strategies for soothing their infants and associated parenting outcomes.

OBJECTIVES: The purpose of this study was to examine the types of soothing behaviors used by mothers and fathers of infants, differences in use trajectories over time, and associated parenting outcomes. METHODS: A longitudinal study of 241 families expecting their second child was performed. Data were collected at 1, 4, and 8 postnatal months and included measures of parental soothing techniques, involvement in soothing, distress in response to infant crying, and parenting self-efficacy. RESULTS: The average number of soothing techniques used was 7.7 for mothers and 5.9 for fathers. Soothing frequency decreased over time, and change patterns of soothing differed over time by gender. In couples who shared responsibility for soothing, fathers felt more efficacious in parenting and mothers were less upset by infant crying. DISCUSSION: Clinicians are encouraged to support fathers' engagement in infant soothing, facilitate the development of fathers' parenting confidence, and promote fathers' involvement in children's health and health care.