Coupled Thermal-Structural Analysis of Generator For sCO2 Turbomachinery

This paper presents the coupled thermal and structural analysis of the rotating components of the generator using ABAQUS finite element solver. The interference between shaft and rotor is optimized to have a positive contact pressure and also minimize the stresses in the laminate at all operating speeds. Thermal analysis is performed to simulate the temperature distribution arising from the heat losses of generator. The flow path of the coolant is designed through the shaft to minimise the temperature rise of the generator. The resulting changes in the contact pressure between laminated disc and shaft is computed using sequentially coupled thermal and structural analysis. The thermal stresses of rotor are computed estimated and the design is optimized for transmitting torque at different operating speeds.

Intergenerational Contact Experiences and Their Relation to Ageism as a Multidimensional Construct

Research on intergroup contact suggests that negative contact experiences affect cognitive representations such as stereotypes more strongly than positive contact experiences. To comprehensively examine the full effect of intergroup contact, the valence of the contact experience as well as the affective and cognitive dimensions of prejudice should be assessed. In ageism research, previous studies typically focused only on contact of positive valence and were limited to the perspectives of younger individuals on older adults. Primary objective of this study is to examine both positive and negative contact frequency and their relation to affective and cognitive dimensions of ageism from the perspectives of younger adults between the age of 18 and 25 (study 1) and older adults between the age of 60 and 92 (study 2). Consistent with previous research on intergroup contact, our results confirm that both types of contact were similarly predictive of affective facets of prejudice. However, only in study 2 that assessed older adults’ agreement with contemporary stereotypes about young men and women, negative compared to positive contact frequency proved to be a stronger predictor of the cognitive dimension of ageism. Our findings emphasize the importance of focusing on all dimensions of prejudice and highlight the need to consider the perspectives of young and old in ageism research.

Affiliate stigma of mental illness in family caregivers of persons with mental illness in Hong Kong

Background: Affiliate stigma of family caregivers may severely influence family caregiving, early treatment, and recovery of people with mental illness (PMI), and it may be impacted by the knowledge of mental illness and contact with PMI. However, little is known about the correlation between affiliate stigma of family caregivers of PMI and contact in Hong Kong. Aims: This study aimed to investigate affiliate stigma and its influencing factors among family caregivers of PMI in Hong Kong. Methods: A total of 106 family caregivers in Hong Kong participated in the study. The measurements included affiliate stigma, contacts (quantity, quality, and level), knowledge, prejudice, and discriminatory behaviors. Multiple regression analyses were employed. Results: The mean score of affiliate stigma scale (ASS) in family caregivers was 2.17 ( SD = 0.65). In regression analyses, the results showed that contact quantity and contact level were significantly associated with higher affiliate stigma and its cognitive domain, while contact quality (e.g. positive contact) were significantly associated with lower affiliate stigma and its all domains among family caregivers. The positive relationship between prejudicial attitudes and affiliate stigma was also found. Conclusions: Affiliate stigma is severe among family caregivers of PMI in Hong Kong. The results of this study indicate that contact, especially positive contact, contributes to reducing affiliate stigma among family caregivers of PMI. The results of this study are important for development of health policy on reducing stigma in family caregivers of PMI. The effectiveness of Enhancing Contact Model (ECM) should be examined in future anti-stigma interventions.

Does Positive Contact Between Residents and Tourists Stimulate Tourists’ Environmentally Responsible Behavior? The Role of Gratitude and Boundary Conditions

This study explored how and when positive contact between residents and tourists stimulates tourists’ environmentally responsible behavior. Drawing on social exchange theory, we verified a moderated mediation model in which gratitude mediated the link between positive contact and tourists’ environmentally responsible behavior, while agreeableness moderated the relationship between positive contact and gratitude. Data were collected from 691 visitors to Mount Wuyi. The findings revealed that positive contact directly affected tourists’ environmentally responsible behavior and that this link was mediated by gratitude. Furthermore, agreeableness significantly moderated the effects of positive contact on gratitude. In particular, the effect of positive contact on gratitude was stronger for tourists with high agreeableness. Additionally, agreeableness also strengthened the indirect relationship between positive contact and tourists’ environmentally responsible behavior through gratitude—which was, again, stronger for highly agreeable tourists.

Implementation of a Web-Based Symptom Checker to Manage the Quarantine of the USS Theodore Roosevelt Crew Following a Shipboard Outbreak of SARS-CoV-2

Introduction: In late March 2020, the USS Theodore Roosevelt (TR), a nuclear-powered aircraft carrier, pulled into port in the US territory of Guam to assess the severity of a developing outbreak of COVID-19 aboard the ship. A small staff contingent of 60 personnel from US Naval Hospital (USNH) Guam was tasked with the medical care of 4,079 sailors who were placed in single room quarantine amongst 11 hotels across the island of Guam. With the assistance of the Defense Digital Service, the USNH Guam staff implemented a web-based symptom checker, which allowed for monitoring of developing COVID symptoms, and selective testing of symptomatic individuals. Materials and Methods: Sailors from the TR were placed in quarantine or isolation cohorts upon debarking the ship. Sailors not positive for COVID-19 were quarantined amongst 11 hotels on Guam. Sailors positive for COVID-19 were isolated aboard Naval Base Guam (NBG). A retrospective cohort analysis and subgroup analyses were performed on symptom data obtained from sailors in quarantine. The sailors recorded their symptoms and temperature in a web-based symptom checker that assigned a symptom severity score (SSS). Sailors with a SSS >50 were evaluated by a medical provider and re-tested. Data were collected from 4 April 2020 to 1 May 2020. Sailors required two negative tests to exit quarantine and re-embark the ship. The time course, and most common cluster of symptoms associated with a positive COVID-19 PCR test were determined retrospectively after data collection. Results: The web-based symptom checker was successful in establishing daily positive contact and symptom monitoring of susceptible individuals in quarantine. 4,079 sailors in quarantine maintained positive contact with medical staff via the symptom checker, with at least 81% of the sailors recording their symptoms on a daily basis. Individuals with high symptom scores were quickly identified and underwent further evaluation and repeat COVID-19 testing. A cohort of 331 sailors tested positive for COVID-19 while in quarantine and recorded symptoms in the symptom checker before and after a positive COVID-19 test. In this cohort, the most frequent symptoms reported prior to a positive test were headache, anosmia, followed by cough. The symptom of anosmia was reported more frequently in sailors positive for COVID-19, compared to a cohort of matched controls. A small medical staff was able to monitor developing symptoms in a large quarantined population, while efficiently allocating resources, preserving personal protective equipment (PPE), and maintaining isolation and social distancing protocols. Conclusions and Relevance: The application provided a tool for broad health surveillance over a large population while maintaining strict quarantine and social distancing protocols. Highly symptomatic sailors were quickly identified, triaged, and transferred to a higher level of care if indicated. The symptom checker and predictive model generated from the data can be utilized by military and civilian public health officials to triage large populations and make rapid decisions on isolation measures, resource allocation, selective testing.

What did we learn after the 2020 pandemic? Seroprevalence of SARS-CoV-2 infection in a North region of Portugal during 3rd lockdown

Background: Serological studies of antibody prevalence in response to infection with the acute respiratory syndrome coronavirus 2 (SARS-CoV-2) are useful to monitor the epidemic progression of the disease and to evaluate infection rates. In this study, we estimated the prevalence of anti-SARS-CoV-2 antibodies (IgM and IgG) in a Portuguese sub-district, during National lockdown - January-March 2021.Methods: In the seroepidemiological survey participants were tested for SARS-CoV-2 antibodies (IgM and IgG), in blood samples. The estimated seroprevalence and results were stratified by age, gender, education, occupational exposure, symptoms and previous SARS-CoV-2 infection.Results: Seroprevalence was 41.3%, (15.7% IgG positive, 11.6% IgM positive and 14% positive for both). The majority (74%) of the participants were working presentially and did the serological assay because they had either symptoms / positive contact (90%) or had a previous positive antigen test (36%). From all the seropositive cases only 44% were symptomatic. Our results show that seroprevalence of SARS -CoV-2 is high in the North, in parallel with the National Surveillance System. Seroprevalence was higher in woman than man and in adults older than 21. Almost all the people with symptoms or a positive contact had a positive test and were working at their regular places of work reflecting the danger of occupational exposure. Conclusions: These results suggest that, between January and March 2021, the restriction conditions were effective but unable to stop SARS-CoV-2 epidemic. It is essential to assess SARS-CoV-2 seroprevalence to monitor population immunity and if it lasts, specially from new COVID 19 variants.

The role of optimal conditions and intergroup contact in promoting positive intergroup relations in and out of the workplace: A study with ethnic majority and minority workers

A field study was conducted with majority and minority group members to test whether the effects of optimal contact conditions and of intergroup contact generalize across situations, and extend to the support of intergroup equality in terms of agreement with social policies benefitting the minority group. Participants were 163 Italian and 129 immigrant workers in three corporate organizations. Results from structural equation modelling analyses revealed that, for the majority group, positive contact stemming from optimal contact conditions was indirectly associated, via reduction in negative stereotypes, with more positive behavior that generalized across situations. For both majority and minority groups, positive contact stemming from optimal contact conditions was associated with less negative stereotypes, and in turn with greater support for social policies favoring the minority. Theoretical and practical implications are discussed, also in relation to the significance of the present results for research investigating the relation between intergroup contact and social change.

EPIDEMIOLOGIC PROFILE OF THE INITIAL COVID 19 PATIENTS AT A DESIGNATED COVID HOSPITAL IN SOUTH TAMIL NADU

BACKGROUND:COVID-19, caused by SARS CoV-2 has caused a worldwide pandemic since its origins in December 2019. The spectrum of the disease ranges from asymptomatic infection to severe respiratory illness causing mortality in severe cases. Person to person spread through respiratory droplets appears to be the most common route of spread. AIM & OBJECTIVE:This study aims to assess the demographic prole of COVID-19 patients. In addition, measures of transmission probability are determined using travel history and contact tracing. SETTINGS AND DESIGN: This study was done at a Government medical college in South Tamil Nadu over four months among patients who were RT-PCR positive for SARS CoV-2. METHODS AND MATERIAL: Aquestionnaire from NCDC for COVID-19 patients was used for collecting demographic and clinical details. Travel history and contact tracing were obtained using telephonic interviews and in person interviews. STATISTICALANALYSIS USED: Data was entered using MS-Excel and analysed using R studio version 3.6.3. RESULTS: Majority of the patients belonged to 20 to 49 years of age. Around 14.6% were symptomatic with fever and sore throat being predominant. Diabetes and hypertension were the most associated comorbidities. A positive contact history was present among 46.58% of the cases. The secondary attack rate was 25.03% and R0 was 2.76 CONCLUSIONS: The absence of a positive contact history and the preponderance of asymptomatic cases seem to contribute to the spread of the disease and impede control efforts. Hence, a multi-pronged approach including community participation, active surveillance systems and legal measures would be of great impact in slowing disease spread.

"I realized that cops are just regular people" : changing youth attitudes toward the police through community policing programming.

Existing literature examining youth-police relations has consistently found that willingness to engage with the police is directly influenced by youth attitudes toward the police. Research findings suggest that increasing positive attitudes toward the police among adolescent populations will result in a subsequent increase in behaviours supportive of the police and law enforcement. The current study was a mixed-method evaluation (including survey data and qualitative interviews) of a community policing pilot program designed to increase positive contact between at-risk youth and police officers. The program was effective in positively changing youth attitudes toward the police. Interview results provide evidence of a direct mechanism for increasing trust and cooperation with the police. Survey results indicate that positive contact with the police can shift general attitudes toward the police and reduce perceptions of police discrimination. Further, survey findings support the program as a remedial intervention for youth with previous negative police contact.

"I realized that cops are just regular people" : changing youth attitudes toward the police through community policing programming.

Existing literature examining youth-police relations has consistently found that willingness to engage with the police is directly influenced by youth attitudes toward the police. Research findings suggest that increasing positive attitudes toward the police among adolescent populations will result in a subsequent increase in behaviours supportive of the police and law enforcement. The current study was a mixed-method evaluation (including survey data and qualitative interviews) of a community policing pilot program designed to increase positive contact between at-risk youth and police officers. The program was effective in positively changing youth attitudes toward the police. Interview results provide evidence of a direct mechanism for increasing trust and cooperation with the police. Survey results indicate that positive contact with the police can shift general attitudes toward the police and reduce perceptions of police discrimination. Further, survey findings support the program as a remedial intervention for youth with previous negative police contact.