Use of cyclic current reversal polarization voltammetry for investigating the relationship between corrosion resistance and heat-treatment induced variations in microstructures of 400 C martensitic stainless steels

Software for running a cyclic current reversal polarization voltammagram has been developed for use with a EG&G Princeton Applied Research Model 273 potentiostat/galvanostat system. The program, which controls the magnitude, direction and duration of an impressed galvanostatic current, will produce data in ASCII spreadsheets (Lotus, Quattro) for graphical representation of CCRPV voltammograms. The program was used to determine differences in corrosion resistance of 440 C martenstic stainless steel produced as a result of changes in microstructure effected by tempering. It was determined that tempering at all temperatures above 400 F resulted in increased polarizability of the material, with the increased likelihood that pitting would be initiated upon exposure to marine environments. These results will be used in development of remedial procedures for lowering the susceptibility of these alloys toward the stress corrosion cracking experienced in bearings used in high pressure oxygen turbopumps used in the main engines of space shuttle orbiters

Multiple Trophic Levels in Soft-Bottom Communities

In order to assess the general applicability of recent field experiments with predatory infauna, we searched the literature and found 48 well-documented cases of infaunal consumption by such predators. In 63 % of the cases detailed enough to make a determination, the predators ate other predators. Multiple trophic levels within the infauna are probably a common feature of many soft-bottom communities

Resilience Culture in the Healthcare Team During COVID-19

Abstract Background: Resilience commonly refers to the ability of an individual or organization to continue to maintain routine, normal, function despite sudden disruptions. Purpose: The purpose of this dissertation research was to provide a deeper understanding of healthcare team resilience. The goal of this research dissertation was to investigate how resilience manifested itself in the healthcare team during the COVID-19 pandemic. AIM 1: What is the concept of resilience in healthcare teams? AIM 2: Identify the barriers and facilitators of healthcare team resilience during the COVID-19 pandemic. AIM 3: Describe how the pandemic influenced healthcare team decision making. Methods: In the first manuscript we performed a comprehensive systematic analysis that delves into the concept of healthcare team resilience in the literature. Based on these results, in the second manuscript the authors utilized an adapted model developed by the research team that frames the healthcare team as a cohesive and aware entity, rather than merely a group of individuals or a subset of personnel within a healthcare system. Finally, the third manuscript uses this adapted model to present research findings from interviews on resilience culture, based on a thematic analysis. Findings: In chapter 2, we found 41 distinct definitions of the concept, with three defining attributes: 1) resilience is triggered by an a priori disruptive event that serves as a catalyst activating the healthcare team\u27s latent potential; 2) this potential leads to the actualization of skills and abilities that enable the team to respond to the disruption in an adaptive manner; 3) the team’s adaptive response enables them to continue executing responsibilities in the face of the disruption. This contributed to AIM 1 by describing the concept of resilience in healthcare teams during COVID-19. The concept analysis brought to light a significant disparity arising from the prevailing literature primarily emphasizing individual resilience as a lens to understand healthcare team resilience, thus potentially obscuring any hidden aspects of resilience within the healthcare team. This discrepancy underscored the necessity to develop a comprehensive model to explore healthcare team resilience during COVID-19 that acknowledges the healthcare team as a singular cognizant entity and not an individual or group of individuals. In chapter 3, we found by integrating knowledge and principles from the domains of resilience engineering, systems engineering, patient safety, and naturalistic decision- making we could create a framework by which AIM 2 and AIM 3 could be addressed. An adapted model was created. The exploration of the barriers and facilitators of resilience and the impact of COVID-19 on the decision-making processes in healthcare teams could be thoroughly explored using the adapted model. A qualitative descriptive study was conducted in 2021 and data were analyzed using reflexive thematic analysis. Chapter 4 presents the findings of this study related to AIM 2 and AIM 3. The study utilized the adapted model as a guide for the interview questions. The author developed the interview questions, which were reviewed and approved by faculty mentors. The author interviewed (N=22) interprofessional healthcare participants who worked during the COVID-19 pandemic. A thematic analysis of the interview data resulted in the identification of five themes related to resilience in the healthcare team during COVID-19: working in a pressure cooker; healthcare team cohesion; applying past lessons to current challenges; knowledge gaps, and altruistic behaviors. The evidence indicates that the pressures form working during COVID-19 and gaps in explicit knowledge, negatively influenced adaptive behaviors to maintain healthcare team resilience. Team cohesion, tacit knowledge and altruistic behaviors positively influenced adaptive behaviors and decision making. Conclusion: This compendium presents the exploration of resilience within healthcare teams amidst the challenges posed by the COVID-19 pandemic. The literature review revealed that the conventional approach to understanding the concept and measuring healthcare team resilience primarily focused on individual resilience. However, this research recognized the need for an adapted model that recognizes the healthcare team as a cohesive and cognizant entity to identify barriers and facilitators of resilience that may be otherwise obscured when solely emphasizing the resilience of individuals, or specific groups. Through a reflexive thematic analysis, several significant findings were identified regarding the impact of the COVID-19 pandemic on the healthcare team: 1) Emotionality played a crucial role in influencing adaptive behaviors, encompassing emotions such as fear, stress, anxiety, and frustration; 2) Drawing upon their tacit knowledge gained from prior experiences, the healthcare team demonstrated the capacity to anticipate and effectively respond to the crisis despite their lack of explicit knowledge, and 3) The solidarity and camaraderie within the healthcare team not only bolstered their overall functionality but also facilitated unified decision-making processes

Hymns in Times of Crisis (Web Review)

Review of the web site: http://www.thehymnsociety.org/hymns-in-times-of-crisi

Environmental Enrichment and Substance Use Disorders

This paper is an investigation into the possibility that Environmental Enrichment (EE) could be a protective factor for people with substance use disorders. The focus of this capstone project will be based on two main sources: “The effect of housing and gender on morphine selfadministration in rats” (Alexander, B. K., Coambs, R. B., & Hadaway, P. F., 1978); and In the Realm of Hungry Ghosts: Close Encounters with Addiction (2010) by Gabor Maté. Alexander et. al, (1978) and Maté (2010) offer suggestions that relate to key parts of EE. The effect of housing and gender on morphine self-administration in rats (Alexander et. al, 1978) and Hungry Ghosts (Maté, 2010) will be reviewed for common themes. Finally I will examine how principles of the effect of housing and gender on morphine self-administration in rats (Alexander et. al, 1978) and Hungry Ghosts (Maté, 2010) can be applied to principles of EE to develop a usable plan for people with substance use disorders

Gender, Social Support, and Resiliency in Suicidal Ideation among U.S. Army Soldiers

Suicidal behaviors have continued to increase in the United States (U.S.) Army population since the beginning of the wars in Iraq and Afghanistan. Suicide rates are higher in men compared to women; yet, the rate of suicidal ideation is higher in women than men. The purpose of this study was to determine if there is a correlation between suicidal ideation and protective factors, if social support and resiliency are different for men and women within the U.S. Army population, and if gender acts as a moderating variable between suicidal ideation and protective factors. The interpersonal-psychological theory of suicidal behavior was used as the foundation for this study. Secondary data were collected from the U.S. Army Public Health Center. After removing missing responses, the total sample size for this study was N = 3,446. Chi-square, independent samples t test, and multiple logistic regressions were used to determine the relationship between gender, suicidal ideation, resiliency, and social support in the U.S. Army active duty population. The percentage who reported suicidal ideation was 3.6% versus 4.9% for males and females, respectively. Social support was statistically significantly correlated with suicidal ideation (p = 0.002) while resiliency was not statistically significantly correlated with suicidal ideation (p = 0.68). Neither scale was effective in detecting differences among gender groups. Refined instruments are needed for evaluation of small changes in regard to protective factors. To promote social change, this study can be used to enhance knowledge about protective factors and gender in the context of the suicidal process, thus furthering the knowledge about how to prevent suicide in the U.S. Army population

In Search of the “Vulnerable Plaque” Can it Be Localized and Will Focal Regional Therapy Ever Be an Option for Cardiac Prevention?

The search to find the location of future plaque ruptures or plaque erosions leading to myocardial infarction (so-called “vulnerable plaques”) is an important area of cardiovascular research. Systemic therapy, including use of statins, targets the vulnerable patient. However, adverse events cannot be completely eliminated with the appropriate application of systemic therapies and thus has given rise to the possibility of local or regional therapy of “vulnerable plaques” to prevent future events. Until now, no criteria have been developed for consideration of this therapy. For such a strategy to work, there should be several prerequisites. These involve the identification of susceptible lesions, the number of lesions, their natural history, and proof that an interventional technique is preferable to medical therapy alone. The greatest deficiency relates to the fact that until the natural history of presumed “vulnerable plaques” is known one can never truly identify what constitutes a “vulnerable plaque.” Much work needs to be done in this area, but ongoing and new trials should provide important information that could potentially change drastically how coronary artery disease is diagnosed and treated

The load shedding advisor: An example of a crisis-response expert system

A Prolog-based prototype expert system is described that was implemented by the Network Operations Branch of the NASA Goddard Space Flight Center. The purpose of the prototype was to test whether a small, inexpensive computer system could be used to host a load shedding advisor, a system which would monitor major physical environment parameters in a computer facility, then recommend appropriate operator reponses whenever a serious condition was detected. The resulting prototype performed significantly to efficiency gains achieved by replacing a purely rule-based design methodology with a hybrid approach that combined procedural, entity-relationship, and rule-based methods

Differences in Dropout Rates as a Function of High School Size for Students in Poverty: A Texas Multiyear, Statewide Study

Child poverty in the United States, with regard to student achievement, has grave challenges for the children who face poverty (Scott & Pressman, 2013). Not only is living in poverty associated with lower academic achievement, but student poverty is also associated with lower rates of school completion (Borg, Borg, & Stranahan, 2012; Cooper & Crosnoe, 2007; Kena et al., 2015). Consequentially, students who do not complete high school are more likely to (a) serve time in prison, (b) need government assistance, and/or ( c) die at an earlier age (Messacar & Oreopoulos, 2013). With the increasing number of children who are living in poverty, child poverty is an issue that needs to be at the forefront of the educational agenda (Tienken, 2012)

A window into the Cambrian basement and early Carboniferous sedimentation of the Hathern Shelf: the British Geological Survey borehole at Ticknall, South Derbyshire, UK

The Ticknall Borehole was drilled in 1995 to a depth of 209 m in order to investigate the succession on the Hathern Shelf, a fault-bounded structural province that lies on the southern margin of the Widmerpool Half-graben, part of a major early Carboniferous rift system. The borehole demonstrated a ‘basement’ of Upper Cambrian cleaved mudrocks, correlated with the Stockingford Shale Group. Unconformably overlying this is a basal Carboniferous unit, the Calke Abbey Sandstone Formation, of probable Visean (?Holkerian) age, comprising 82.34 m of fluvial sandstones and conglomerates, with interbedded red-grey palaeosols exhibiting highly distinctive ‘pseudogley’ fabrics indicative of emergent episodes. The unit may have been deposited in a localized, possibly fault-controlled basin and was in part sourced from the Precambrian volcanic terrain of Charnwood Forest. As rifting and subsidence proceeded, the encroachment of nearshore/peritidal environments is indicated at the top of the formation by interbedded calcilutites that have yielded marine faunas. Fully marine conditions were established during deposition of the overlying Peak Limestone Group, comprising the early Asbian Cloud Hill Dolostone Formation succeeded by the Ticknall Limestone Formation, of Brigantian age. Comparisons between the Ticknall Borehole and Peak Limestone strata exposed in quarries farther east, around Breedon, show major changes in water depths over a distance of only 4.5 km. Such variations can be reconciled with seismostratigraphical studies in the adjacent Widmerpool Half-graben, which show that sedimentation on the Hathern Shelf was in part controlled by movements along nearby rift-bounding faults