A transfer function based on bilinear transformation for narrow-band seismic record.

For a narrow-brand seismograph with a flat response range limited, it cannot precisely record the signal of a ground motion and output the records with the low-frequency components cut down. A transfer function is usually used to spread the spectrum of the narrow-brand seismic records. However, the accuracy of the commonly used transfer function is not high. The authors derive a new transfer function based on the Laplace transform, bilinear transform, and Nyquist sampling theory to solve this problem. And then, the derived transfer function is used to correct the narrow-band velocity records from the Hi-net. The corrected velocity records are compared with the velocities integrated from the synchronously recorded broad-band acceleration at the same station with Hi-net. Meanwhile, the corrected records are compared with those corrected by the Nakata transfer function. The results show that the calculation accuracy of the derived transfer function is higher than the Nakata transfer function. However, when the signal-to-noise ratio is below 24, its accuracy diminishes, and it is unable to recover signals within the 0.05-0.78Hz frequency band.

Pressure-relief joints of initial support structural system used in tunnels with high-stress surrounding rock.

To address the problem of large deformations in weak surrounding rock tunnels under high ground stress, which cause damage to initial support structures, this study proposes a novel type of circumferential pressure-relief joint based on the concept of relieving deformation pressure of the surrounding rock. Key parameters of the pressure-relief joint, such as initial bearing capacity peak, constant bearing capacity, and allowable pressure-relief displacement, were obtained through numerical simulations and laboratory experiments. A comparison was made between the mechanical characteristics of rigid joints and the new type of pressure-relief joint. The applicability of the pressure-relief joint was verified through field tests, monitoring the surrounding rock pressure, internal forces in the steel frames, and the convergence displacement of the support structure. The results show that: (1) In the elastic stage, the stiffness of the new pressure-relief joint is similar to that of rigid joints. In the plastic stage, rigid joints fail directly, whereas the pressure-relief joint can control deformation and effectively release the deformation pressure of the surrounding rock while providing a constant bearing capacity. (2) The right arch foot in the experiment had poor rock quality, leading to high stress in the steel frame and significant horizontal displacement. After the deformation of the pressure-relief joint, the stress in the surrounding rock and steel frame significantly reduced, and the rate of horizontal deformation of the support structure slowed down. (3) The vertical and horizontal final displacements of the pressure-relief joint in the experiment were 61mm and 15mm, respectively, which did not exceed the allowable deformation values. The components of the support structure remained intact, ensuring safety. However, this study has limitations: the design of the new pressure-relief joint only allows for a vertical deformation of 150mm and a horizontal deformation of 50mm, limiting the range of pressure-relief deformation.

Approximation method for yielding support analysis in high ground stress soft surrounding rock tunnels.

In solving the whole process of interaction between soft rock and yielding support in high-stress environments in tunnels using mechanical analysis methods, it is challenging to simultaneously satisfy both displacement coordination and static equilibrium at the contact surface between the rock and the support structure. This paper, based on the mechanical analysis of rock and rigid support, considers the impact of the circumferential installation of yielding elements on radial displacement, and proposes displacement approximation and support force approximation methods using displacement coordination and static equilibrium as approximation conditions. The study fits curves of numerical simulation results and laboratory test results of yielding elements, and attempts to directly use the laboratory test data set of yielding elements as computational data. By calculating two circular tunnel examples and comparing the effects of the trisection method, bisection method, and substitution method on the convergence of the displacement approximation method, the effectiveness of the methods proposed in this paper is verified. The research results show that the two approximation algorithms proposed in this paper have good accuracy and reliability in calculating the relative displacement of rock and yielding support structure contact surfaces, and the support force of yielding support. The bisection method outperforms the trisection and substitution methods in terms of stability and convergence. However, there are certain limitations in this study, such as the effectiveness of the algorithm may be influenced by geological conditions; the complexity of actual geological conditions may exceed the assumptions of the current rock-support mechanical analysis model.

Association between occupational burnout and psychological symptoms among Chinese medical staff: moderating role of social support.

This study aimed to examine the association between occupational burnout and psychological symptoms among Chinese medical staff, assuming social support to play a moderating role in the aforementioned relationship. The survey was conducted online from May 1 to June 28, 2022, and the questionnaires were distributed and retrieved through a web-based platform. The final sample was comprised of 1461 Chinese medical staff in this cross-sectional study. Several multiple linear regressions were performed to analyze the data. After controlling for potential confounding factors, all three dimensions of occupational burnout were associated with poorer psychological symptoms. Emotional exhaustion (ß = 0.33; 95% confidence interval [CI], 1.018, 1.479) had the strongest association with psychological symptoms, followed by depersonalization and diminished personal accomplishment. Moreover, medical staff with higher levels of friend support (ß = -0.11; 95% CI, -4.063, -0.573) and significant other support (ß = -0.10; 95% CI, -3.965, -0.168) were less likely to suffer from psychological symptoms when faced with occupational burnout. The results suggested that interventions aimed at lessening occupational burnout and boosting social support can be an effective way to promote the psychological health of medical staff.

School-based Psychosocial interventions on mental health among Chinese rural children with traumatic experiences: a protocol using cluster randomized controlled trial.

BACKGROUND: The first aim of this study is to test the effectiveness of school-based psychosocial interventions for improving mental health in rural Chinese children with traumatic experiences. The second aim is to examine which individual, family and school related factors could explain the effectiveness of school-based psychosocial interventions. Third, we will investigate whether individual, family, and school related conditions play a moderator role on the effectiveness of school-based psychosocial interventions. METHODS: This study will conduct a cluster randomized controlled trial (RCT) in a large sample of Chinese rural children. Four rural counties in Shandong (Central China), Henan (Central China), Inner Mongolia (Northern China), and Xinjiang (Western China) will be selected as study settings from which schools will be sampled. Each sampled school will be randomly allocated either the intervention groups or a control group. Randomization will be performed by the research member who is not involved in the intervention stage. In each school students in grade 5 or higher will be recruited to ensure that approximately 50 children aged 10 to 18 years will be included. In each county, one high school, one middle school, and one primary school will be randomly chosen as the intervention group, and the other three similar schools will be chosen as control (waiting list) groups. A standardized and uniform research protocol will be applied in all intervention schools. All school social workers and psychological teachers would receive one week of in-person training following procedures. School-based psychosocial interventions included 14 group sessions for 14 consecutive weeks. DISCUSSION: This study would develop school-based mental health promotion policy recommendations to improve Chinese rural children's mental health. This study can provide solid evidence for the promotion of school-based intervention in general. TRIAL REGISTRATION: ChiCTR2300069405, Registered on 15 March 2023.

The moderating effects of colleagueship on the relationship between mental health and perceived stigma among Chinese firefighters.

OBJECTIVE: To date, few studies have examined the relationship among mental health symptom severity, colleagueship, and perceived stigma, especially in Chinese firefighters. This study aims to investigate the association between posttraumatic stress symptoms (PTSS), depressive symptoms, and perceived stigma, taking colleagueship as a moderator. METHOD: This cross-sectional study included a total of 1,328 Chinese firefighters. These subjects completed electronic questionnaires from July 1 to August 31, 2021. Multivariate linear regression analyses were performed to assess the relationship between mental health symptoms and perceived stigma and the possible moderating effect of colleagueship on the above relationship. RESULTS: After adjusting for possible confounders, both PTSS (ß = 0.088, 95% CI [0.013, 0.163]) and depressive symptoms (ß = 0.252 [0.177, 0.327]) were positively associated with stigma about seeking mental health care. Additionally, colleagueship and its dimensions, such as face (ß = 0.090 [0.024, 0.156]), instrumentality (ß = 0.234 [0.178, 0.291]), and emotion (ß = -0.091 [-0.163, 0.020]), had significant associations with perceived stigma. Moreover, the association between mental health symptoms and stigma was significantly moderated by colleagueship. CONCLUSIONS: Mental health symptom severity is positively associated with perceived stigma, and colleagueship enhanced this relationship. The present findings suggest that anti-stigma campaigns should focus on stigma related to colleagueship in the background of Chinese culture and highlight the need to establish confidential assistance programs and mental health awareness programs. (PsycInfo Database Record (c) 2023 APA, all rights reserved).

Social support profiles correlate with depressive symptoms among Chinese parents during the COVID-19 pandemic: A latent profile analysis.

This study explored pandemic-related social support profiles and investigated their relationships with depressive symptoms among Chinese parents during the COVID-19 pandemic. The hypotheses were evaluated in an online cross-sectional survey of 1286 parents. Latent profile analysis identified two profiles of received social support (isolated and integrated support). Three convergent profiles (high, moderate, and low support) and one divergent profile were found in perceived social support. The results revealed that the distribution of age, region, income and educational level varied across these profiles. Only the "high" (ß = -0.11, p < 0.01) and "divergent" (ß = -0.12, p < 0.01) profiles of perceived social support were negatively associated with parents' depressive symptoms. These findings highlight the importance of developing better-targeted intervention programs aimed at optimizing the allocation and improving the quantity and quality of supportive resources for parents.

The prevalences, changes, and related factors of child maltreatment during the COVID-19 pandemic: A systematic review.

BACKGROUND: The impact of the COVID-19 pandemic has been extensive and drastic during the twenty-first century. The increasing phenomenon of child maltreatment during the pandemic is a significant public health concern. OBJECTIVE: This study is the first systematic review to analyze and summarize the prevalence rates, risk factors, and protective factors related to child maltreatment during the COVID-19 pandemic. METHODS: Four electronic databases (PubMed, Web of Science, Scopus, Embase) were systematically searched. Some potential studies were also identified from the reference lists of previously included articles. The quality of the included studies was assessed by the National Institutes of Health (NIH) Quality Assessment Tool and Critical Appraisal Skills Program (CASP) Quality Assessment Tool. RESULTS: A total of 35 articles were included in the analysis, with 16 having prevalence information and 22 having factor information. Sixteen studies were conducted in the US, the other 17 studies were from 12 countries, and only two studies contained mixed countries. The prevalences of child maltreatment during the pandemic varied widely in different types and measurements. The pandemic rates of physical abuse, psychological abuse, neglect, and sexual abuse were 0.1 %-71.2 %, and 4.9 %-61.8 %, 7.3 %-40 % and 1.4 %-19.5 %, respectively. There was a decline in allegations of child maltreatment and an increase in severe cases of child maltreatment during the COVID-19 pandemic. Lockdown measures and their side effects were the main risk factors contributing to child maltreatment. CONCLUSIONS: This review calls for targeted measures to prevent child maltreatment during the COVID-19 pandemic and current and future lockdowns and more future replication studies conducted in countries other than the US.

Relationship among Child Maltreatment, Parental Conflict, and Mental Health of Children during the COVID-19 Lockdown in China.

Children are more likely to experience maltreatment and parental conflict in a pandemic context, which can exacerbate their vulnerability to psychological disorders. The purpose of the present study was to examine mental health symptoms in children aged 0 to 10 years and consider related factors from the perspectives of maltreatment and parental conflict during the COVID-19 lockdown. Participants were 1286 parents aged 18 years and over with children aged 0 to 10 years were included. Several multivariable linear regressions were used to analyze the data. The largest variance in child mental health was explained by child maltreatment, as more maltreatment predicted higher reported psychological problems (standardized beta = 0.49, P < 0.001). Comparatively, parental conflict predicted less variance in mental health problems than maltreatment (standardized beta = 0.18, P < 0.001). Children who experienced more maltreatment experience and exposure to COVID-19 showed elevated levels of mental health symptoms (standardized beta = 0.06, p < 0.05), as did those who experienced parental conflict and pandemic exposure (standardized beta = 0.06, p < 0.05). The findings highlight that tailored programs that focus on a healthy family environment and strategic parental support services may be particularly effective in reducing children's mental health problems due to COVID-19 exposure.

The Relationship Between Job Burnout and Depressive Symptoms Among Chinese Firefighters: Colleagueship as a Moderator.

OBJECTIVES: This study aims to investigate the association between job burnout and depressive symptoms among Chinese firefighters, assuming colleagueship to play a moderating role in the aforementioned relationship. METHODS: This study is based on an online survey recruiting 1328 Chinese male firefighters from July 1 to August 31, 2021. Multiple linear regressions were used to examine the associations. RESULTS: This study revealed that all dimensions of job burnout were associated with worse depressive symptoms. Cynicism (ß = 0.30; 95% confidence interval [CI], 0.236, 0.356) had the strongest association with depressive symptoms, followed by emotional exhaustion and inefficacy. Moreover, firefighters with better affective colleagueship (ß = -0.10; 95% CI, -0.141, -0.061) and better obligatory colleagueship (ß = -0.07; 95% CI, -0.115, -0.034) were less likely to have depressive symptoms when confronted with job burnouts. CONCLUSIONS: This study suggests employers and practitioners should target their intervention efforts at both job burnout and colleagueship.

The Associations Between Parental Burnout and Mental Health Symptoms Among Chinese Parents With Young Children During the COVID-19 Pandemic.

The Coronavirus Disease 2019 (COVID-19) pandemic has caused numerous unexpected changes for families and societies, which have likely contributed to higher amounts of stress for most parents. This study aimed to examine the relationship between burnout and mental health among parents during the COVID-19. Pandemic exposure and household factors (e.g., family structure, family function) were examined as moderators. An online cross-sectional survey recruiting 1,209 adults was conducted from April 21st to April 28th, 2020 during the COVID-19 lockdown in China. The multivariable linear regression analysis was employed to test the association between burnout, household factors, and mental health among parents. Findings suggested that for parents with a young child, poorer mental health was related to a higher level of burnout (ß = 0.220, P < 0.001) and greater exposure to the pandemic. Mothers of a single and/or young child had considerably poorer mental health. Moreover, the relationship between mental health and burnout among parents was significantly moderated by epidemic exposure (ß = 2.561, P < 0.001), family structure (number of children: ß = -1.257, P < 0.001; first child age: ß=-1.116, P < 0.001) and family function (ß = -0.574, P < 0.05). This study indicated that burnout symptoms were significantly associated with worse mental health among parents in China. Besides, exposure to the pandemic, family structure, and family function was found to moderate the association between burnout and mental health among parents. Therefore, the present study stressed enhanced access to mental health resources and emotional supports for parents during a public crisis to reduce the deleterious effects of burnout.

Associations of youth mental health, parental psychological distress, and family relationships during the COVID-19 outbreak in China.

BACKGROUND: The COVID-19 pandemic has brought significant changes in society and family life, which could be particularly difficult for parents. The present study examines the relationship between youth mental health and parental psychological distress after the first peak of the COVID-19 Outbreak in China. The parent-child and marital relationships were examined as moderators of the above relationship. METHODS: Parents and their children aged 10 to 18 years were recruited for this study. The parents completed the Depression Anxiety Stress Scales-21 (DASS-21), the Strengths and Difficulties Questionnaire (SDQ), and a subset of items from the questionnaire of the COVID-19 Supporting Parents, Adolescents, and Children in Epidemics (Co-SPACE) survey of parental mental health, child's psychological symptoms, parent-child, and marital relationship. Several multiple linear regressions were used to analyze the data. RESULTS: The largest variance in parental mental health was explained by the child's psychological symptoms (effect size beta = 0.27). Parent-child (effect size beta = -0.13) and marital relationship (effect size beta = -0.21) were negatively associated with parental mental health. The relationship between child's psychological symptoms and parental mental health was moderated by marital relationship (effect size beta = -0.07). Both parent-child and marital relationships presented with a significant interaction with impact scores, while only parent-child relationships with burden scores. CONCLUSIONS: Youth mental health problems were significantly associated with parental psychological symptoms during the early phase of the COVID-19 pandemic The parent-child and marital relationship moderated the association between youth psychological symptoms and parental mental health. Interventions for alleviating parenting stress and support services that improve family relationships may be particularly effective in reducing parental psychological distress associated with future COVID-19 or related crises.

Chinese Younger Parents' Quality of Life During the COVID-19 Pandemic: Do Job Changes and Family Conflicts Matter?

The quality of life (QoL) might have been decreased owing to social disruptions in daily life and basic functioning after the coronavirus disease (COVID-19) pandemic. This work aims to examine the relationship between job changes, family conflicts, and QoL among parents during COVID-19 in China. We recruited 1,209 adults through an online cross-sectional survey in China during the COVID-19 lockdown from April 21 to April 28, 2020. Convenient and cluster sampling methods were used to recruit parents. The global health items in the Patient-Reported Outcomes Measurement Information System (PROMIS) were used as a measurement for QoL. Data were mainly analyzed by multiple linear regression with SPSS. Both marital conflict (ß = -0.243, p < 0.001) and parent-child conflict (ß = -0.119, p = 0.001) were negatively associated with the QoL among parents during the lockdown. Job changes moderated the relationship between marital conflict and QoL (ß = -0.256, p = 0.022). In addition, the interaction effects of job changes and family conflict on QoL were significant only among fathers and one-child families. This study indicated that family conflict was a crucial factor correlated with QoL among young parents in the backdrop of the COVID-19 lockdown. Job changes could interact with marital conflict and parent-child conflict on the quality of life.