Synthesis and characterization of amorphous astrominerals

Abstract only availableAsymptotic Giant Branch (AGB) stars are the main contributors of solid material (dust) to the interstellar medium. The dust forms as gas escaping from the star cools and condenses to form a circumstellar dust shell. Around oxygen-rich stars, most of the dust particles are silicates, but important questions remain about which minerals are formed and whether the grains are crystalline or amorphous (glassy). Dust grains that form below the glass transition temperature (Tg) of a particular mineral should be amorphous, while those that form much above Tg should be crystalline. The most refractory silicates predicted to form are members of the Melilite group of minerals, whose end-members are Gehlenite (Ca2Al2SiO7), Sodium Melilite (CaNaAlSi2O7) and Åkermanite (Ca2MgSiO7). Synthetic glasses corresponding to these end-member compositions were synthesized from oxide and carbonate powders by melting in Pt crucibles in a muffle furnace at temperatures up to 1650˚C. The viscosity of the melts was measured by the parallel-plate technique in the temperature range 655 to 900˚C, over the viscosity range 2x107 to 91012 Pa s. The viscosity-temperature data were interpolated to determine Tg for each glass, taken to be the temperature at which the viscosity is 1012 Pa s. Two naturally occurring mineral samples, of åkermanite and gehlenite, were also melted. At higher temperatures and lower viscosities than about 108 Pa s, crystallization is expected to be rapid relative to the timescale of cooling in circumstellar dust shells. Our experimentally determined glass transition temperatures therefore provide constraints on the nature (crystalline vs amorphous) of several refractory astrominerals predicted to be found in these shells. Future studies of these glasses will include infrared spectroscopy, in order to better interpret astronomical spectra and test for the presence of amorphous dust with these compositions. The results will be used to test competing models for circumstellar dust formation.Missouri Academy at Northwest Missouri State Universit

Leveraging Health Behavior and Communication Theories to Support Adolescent and Young Adults: Conceptualizing Social Media Wellness in Relation to Disordered Eating

Social media platforms like Instagram serve as an important mechanism for transmitting social information and influence. However, the nature and use of these platforms are known to perpetuate eating disorders (EDs) or further disorder eating symptoms. This concept paper proposes merging health behavior and communication theory to create a comprehensive and applicable framework for remediating pro-eating disorder social media content among people who have eating disorders. To this end, the Social Media Wellness Model, which is adapted from the Health Belief Model, the Uses and Gratifications approach, the MAIN model of media affordances, and media literacy training, is proposed. This paper shows how theoretical model components can be mapped back to behaviors typified by individuals with EDs, or those predisposed to developing EDs. Subsequently, we propose a training intervention to highlight salient literacy cues, and outline next steps for testing and developing this model with the ongoing support of a community advisory board (CAB). Creating a CAB with individuals who have lived experience of an ED or disordered eating, and who use social media, will be vital to testing the applicability of this conceptual Social Media Wellness Model for ED recovery

Adolescent distinctions between quality of life and self-rated health in quality of life research

BACKGROUND: In adult quality of life (QOL) research, the QOL construct appears to differ from self-rated health status. Although increased QOL continues to be recognized as an important outcome in health promotion and medical intervention, little research has attempted to explore adolescent perceptual differences between self-rated health and QOL. METHODS: Correlational analyses were performed between self-rated health, physical health days and mental health days, and QOL. Data were collected from two different public high school adolescent samples during two different time periods (1997 & 2003) in two different geographic regions in the USA (a southern & midwestern state) with two different sample sizes (N = 5,220 and N = 140, respectively) using the CDC Youth Risk Behavior Survey (YRBS). The Centers for Disease Control and Preventions' health-related quality of life scale (HRQOL) provided estimates of self-rated health, physical health days and mental health days, and QOL. RESULTS: All correlation coefficients were significant in both samples (p ≤ .0001), suggesting sample size was not a contributing factor to the significant correlations. In both samples, adolescent QOL ratings were more strongly correlated with the mean number of poor mental health days (r = .88, southern sample; r = .89, midwestern sample) than with the mean number of poor physical health days (r = .75, southern sample; r = .79, midwestern sample), consistent with adult QOL research. However, correlation coefficients in both samples between self-rated health and the mean number of poor physical health days was slightly smaller (r = .24, southern, r = .32, midwestern) than that between self-rated health and the mean number of poor mental health days (r = .25, southern, r = .39 midwestern), which is contrary to adult QOL research. CONCLUSION: Similar to adults, these results suggest adolescents are rating two distinct constructs, and that self-rated health and QOL should not be used interchangeably. QOL, in the context of public high school adolescents, is based largely upon self-reported mental health and to a lesser extent on self-reported physical health. Conversely, although self-reported mental health and self-reported physical health both contribute significantly to adolescent self-rated health, mental health appears to make a greater contribution, which is contrary to observations with adults. Health promoting efforts for adolescents may need to focus more on mental health than physical health, when considering population needs and type of micro or macro intervention

Not all developmental assets are related to positive health outcomes in college students

<p>Abstract</p> <p>Background</p> <p>The purpose of this investigation was to model the relationships between developmental assets, life satisfaction, and health-related quality of life (HRQOL) among a stratified, random sample (<it>n </it>= 765, 56% response rate) of college students.</p> <p>Methods</p> <p>Structural equation modeling techniques were employed to test the relationships using Mplus v4.21; Model evaluations were based on 1) theoretical salience, 2) global fit indices (chi-square goodness of fit, comparative fit index: CFI and Tucker-Lewis Index: TLI), 3) microfit indices (parameter estimates, root mean squared error of approximation: RMSEA and residuals) and 4) parsimony.</p> <p>Results</p> <p>The model fit the data well: χ²(<it>n </it>= 581, 515) = 1252.23, CFI = .94, TLI = .93 and RMSEA = .05. First, participants who reported increased Family Communication also reported higher levels of life satisfaction. Second, as participants reported having more Non-Parental Role Models, life satisfaction decreased and poor mental HRQOL days increased. Finally increased Future Aspirations was related to increased poor mental HRQOL days. Results were variant across gender.</p> <p>Conclusions</p> <p>Preliminary results suggest not all developmental assets are related to positive health outcomes among college students, particularly mental health outcomes. While the findings for Family Communication were expected, the findings for Non-Parental Role Models suggest interactions with potential role models in college settings may be naturally less supportive. Future Aspirations findings suggest college students may harbor a greater temporal urgency for the rigors of an increasingly competitive work world. In both cases, these assets appear associated with increased poor mental HRQOL days.</p

Equity in an Equal Access System? - Quality & Timeliness of Cancer Care in the Veterans Affairs Healthcare System

The objective of this dissertation was to examine the association between patients' race and receipt of National Comprehensive Cancer Network guideline-adherent and timely colorectal cancer (CRC) and non-small cell lung cancer (NSCLC) care in the Veterans Affairs (VA) healthcare system. Data were from the External Peer Review Program (EPRP) Special Study on CRC and NSCLC, originally purposed for performance monitoring, examined in an observational, retrospective study design. The sample consisted of African American (AA) and Caucasian patients diagnosed with CRC between 2003 and 2006 or NSCLC between 2006 and 2007 at VA hospitals nationwide. Statistical analysis approaches included multivariate logistic regression and survival analysis methods. Our first analysis used multivariable logistic regression to examine associations between race and receipt of guideline-concordant care (computed tomography scan, preoperative carcinoembryonic antigen, clear surgical margins, medical oncology referral for Stages II-III; fluorouracil-based adjuvant chemotherapy for Stage III; surveillance colonoscopy for Stages I-III). There were no significant racial differences in receipt of guideline-concordant CRC care. Our second analysis examined associations between race and CRC care timeliness. There were no racial differences in time to chemotherapy initiation (HR 0.82, p=0.61) or surgery to death (HR 0.94, p=0.0.49). Caucasian race was protective for shorter time to first surveillance colonoscopy (HR 0.63, p=0.02). On average, the difference in time to colonoscopy was sixteen days. Our third analysis examined associations between race and NSCLC care timeliness. There were no racial differences in time to initiation of treatment (72 days for AA versus 65 days for Caucasian patients, HR 1.03, p=0.80) or palliative care or hospice referral (129 versus 116 days, HR 1.10, p=0.34). However, the adjusted model found longer survival for African American compared to Caucasian patients (133 versus 117 days, HR 1.31, p=0.00). In these data there were minimal statistically significant racial differences. We identified no clinically meaningful racial differences in cancer care quality, timeliness, or patient outcomes. This suggests that VA may be a leader in providing equitable cancer care. Future studies could examine causal pathways for the VA's equal, quality care and ways to translate the VA's success into other hospital systems.Doctor of Philosoph

Life satisfaction among a clinical eating disorder population

Background The primary objective was to understand life satisfaction (LS) of patients with eating disorders (EDs) in relation to eating pathology severity, personal/familial ED history, and key demographic and anthropometric variables. Methods Participants (N = 60) completed the Satisfaction with Life Scale (SWLS), the Eating Pathology Severity Index (EPSI), and demographic questionnaires. Bivariate associations via correlations and multiple linear regression models were used to explore these relationships. Results The SWLS mean score was 3.7 out of 7, suggesting it is below the population-based norm. LS was positively statistically significantly associated with private insurance, past ED, EPSI muscle building, EPSI restricted eating, and EPSI negative attitudes. When included in multiple linear regression, the model explained 33% of the variability of LS [F (7, 56) = 3.4, p = 0.0054, R2 = 0.33]. EPSI muscle building remained the strongest predictor (β = 0.13, p = 0.04). Conclusions Based on the data, individuals who have/have had EDs scored lower on the SWLS than the general population. Individuals scoring within this range typically experience significant issues in several areas of life or a substantial issue in one area

The Relationship between School Climate and Faith Engagement

The study of school climate has gained increased attention over the past 25 years, with research indicating significant relationships between school climate and a number of social, emotional and academic outcomes for students. An aspect of school climate that has seen little attention, however, is the relationship between the development of faith and positive school climate. This study analyses data from 368 students in one faith-based school in Australia, utilising self-reported measures of school climate and faith engagement. A significant relationship is found between these variables, indicating the potential impact that school climate and faith engagement may have on each other. The study discusses the implications of these findings and makes suggestions in relation to the strengthening of these two areas within faith-based schools

Faith Engagement at School

The ability of teachers to engage and develop the faith journey of students is seen as a central endeavour in faith-based schools. Much has been written in the literature regarding approaches that may be effective in facilitating this process. This study analysed qualitative data collected from 368 Year 5–12 students from one faith-based school in Australia. Students reported on the key areas they believe assist in developing their faith, in addition to aspects they believe could be improved in this regard. A significant difference was found between the attitudes of those who reported not having a faith background and those who did. This chapter builds onto findings reported in the previous chapter

Barriers to using new needles encountered by rural Appalachian people who inject drugs: implications for needle exchange

Background Using a new needle for every injection can reduce the spread of infectious disease among people who inject drugs (PWID). No previous study has examined new needle use barriers among PWIDs residing in the rural Appalachian part of the United States, an area currently in the midst of a heroin epidemic. Objective Therefore, our primary aim was to explore self-reported barriers to using a new needle by PWID attending a needle exchange program (NEP). Methods We conducted a cross-sectional survey of PWID attending two NEPs in rural West Virginia located in the heart of Central Appalachia. A convenience sample of PWID (n = 100) completed the Barriers to Using New Needles Questionnaire. Results The median number of barriers reported was 5 (range 0–19). Fear of arrest by police (72% of PWID “agreed” or “strongly agreed”) and difficulty with purchasing needles from a pharmacy (64% “agreed” or “strongly agreed”) were the most frequently cited barriers. Conclusions/Importance Congruent with previous findings from urban locations, in rural West Virginia, the ability of PWID to use a new needle obtained from a needle exchange for every injection may be compromised by fear of arrest. In addition, pharmacy sales of new needles to PWID may be blunted by an absence of explicit laws mandating nonprescription sales. Future studies should explore interventions that align the public health goals of NEPs with the occupational safety of law enforcement and health outreach goals of pharmacists