Rapid evaluation of ion thruster lifetime using optical emission spectroscopy

A major life-limiting phenomenon of electric thrusters is the sputter erosion of discharge chamber components. Thrusters for space propulsion are required to operate for extended periods of time, usually in excess of 10,000 hr. Lengthy and very costly life-tests in high-vacuum facilities have been required in the past to determine the erosion rates of thruster components. Alternative methods for determining erosion rates which can be performed in relatively short periods of time at considerably lower costs are studied. An attempt to relate optical emission intensity from an ion bombarded surface (screen grid) to the sputtering rate of that surface is made. The model used a kinetic steady-state (KSS) approach, balancing the rates of population and depopulation of ten low-lying excited states of the sputtered molybdenum atom (MoI) with those of the ground state to relate the spectral intensities of the various transitions of the MoI to the population densities. Once this is accomplished, the population density can be related to the sputtering rate of the target. Radiative and collisional modes of excitation and decay are considered. Since actual data has not been published for MoI excitation rate and decay constants, semiempirical equations are used. The calculated sputtering rate and intensity is compared to the measured intensity and sputtering rates of the 8 and 30 cm ion thrusters

Portrayals of canine obesity in English-language newspapers and in leading veterinary journals, 2000-2009: Implications for animal welfare organizations and veterinarians as public educators

In industrialized societies, more than one in three dogs as well as people currently qualify as overweight or obese. Experts in public health expect both these figures to rise. While clinical treatment remains important, so are public perceptions and social norms. This article presents a thematic analysis of English-language mass media coverage on canine obesity from 2000 through 2009, and compares these results with a thematic analysis of articles on canine obesity in leading veterinary journals during the same time period. Drawing on Giddens’ theory of structuation, articles that emphasised individual agency, environmental structure or both as contributors to canine obesity were identified. Comparisons with weight-related health problems in human populations were virtually absent from the veterinary sample. While such comparisons were almost always present in the media sample, veterinarians and other animal welfare spokespeople were quoted in ways that emphasized the agency of individual owners over structural influences. Now that weight gain and obesity have been established as a pressing animal welfare problem, these results suggest a need for research and for interventions such as media advocacy that emphasizes intersections between animal-owner agency and socio-environmental determinants, and connections between animal welfare and human health

Effects of E-Coaching During Mursion™ Simulations On the Occurrence and Variety of Behavior Specific Praise

We used a concurrent multiple-baseline research design replicated across participants to evaluate the effects of eCoaching on increasing the delivery and maintenance of behavior specific praise (BSP) in a mixed-reality Mursion™ classroom simulation. Participants consisted of four master’s students in a special education program. Results showed noteworthy increases in the rate and percent participants gave BSP during the intervention condition. Additionally, praise variety increased in all participants, and high rates of BSP were observed as the intervention was faded and removed all together. Our study extends the extant literature on an emerging evidencebased practice (i.e., BSP) and helps validate eCoaching and an effective method for providing immediate feedback during Mursion™ classroom simulations

The Effects of Teacher-Delivered E-Coaching on Paraeducators and Students

Paraeducators play a vital role in providing special education services to students with disabilities, yet they often enter the classroom with inadequate training. Using a multiplebaseline across participants research design, we evaluated the effects of job-embedded bug-in-ear (BIE) coaching delivered to paraeducators on their use of behavior specific praise (BSP) while working 1:1 with transition-age students with autism spectrum disorder (ASD). Results showed all paraeducators used optimal rates of BSP during the intervention condition while receiving immediate feedback from the special education teacher (i.e., eCoach). High rates of BSP were sustained over time, and changes in expressive social and communicative behaviors in students were observed in relation to the intervention. Our findings extend the literature on BSP and have merit to help establish BIE coaching as an evidence-based practice (EBP) for paraeducators

Dyadic influence of hope and optimism on patient marital satisfaction among couples with advanced breast cancer

PURPOSE: An estimated 10-40 % of breast cancer (BC) patients report negative changes to their partnered relationships. Literature suggests that for these patients, marital satisfaction is related to depression and other quality of life factors which are associated with survivorship and treatment response. However, existing literature does not provide a clear explanation of the factors that strengthen vs. create strain in couples facing cancer. Given the benefits of a satisfying relationship to patient quality of life, it is important to better understand factors that put patients at greater risk for marital difficulties. This study examined the differential and combined roles of hope and optimism among BC patients and their partners on patient marital satisfaction. METHOD: Fifty-six breast cancer patient-partner dyads completed study questionnaires as part of a larger study. Regression analyses were used to examine the main and interaction effects of patient and partner hope and optimism on patient marital satisfaction. RESULTS AND CONCLUSION: Higher patient and partner hope predicted greater patient marital satisfaction, whereas optimism did not. These results are divergent from the literature on optimism and well-being, which shows the importance of studying these two traits concurrently. Interaction effects suggest certain combinations of patient and partner hope and optimism are more beneficial than others for patient marital satisfaction and suggest a dyadic approach is important for investigation of well-being in breast cancer

Dropout from exercise programs for seniors: a prospective cohort study

This study examines dropout incidence, moment of dropout, and switching behavior in organized exercise programs for seniors in the Netherlands, as determined in a prospective cohort study (with baseline measurements at the start of the exercise program and follow-up after 6 months; N = 1,725, response rate 73%). Participants were community-living individuals 50+ who participated in different forms of organized exercise programs. The average dropout incidence was 0.15 per 6 months, which is lower than that for the general population. The dropout incidence and the timing of dropout differed substantially between the exercise programs. In total, 31% of people who dropped out of one type of exercise program switched to another type of exercise. The type of program and exercise had a strong effect on differences in this switching behavior. It is recommended that switching behavior be monitored in future studie

A multifractal zeta function for cookie cutter sets

Starting with the work of Lapidus and van Frankenhuysen a number of papers have introduced zeta functions as a way of capturing multifractal information. In this paper we propose a new multifractal zeta function and show that under certain conditions the abscissa of convergence yields the Hausdorff multifractal spectrum for a class of measures

Physical activity patterns in urban neighbourhood parks: Insights from a multiple case study

Background: Many characteristics of urban parks and neighbourhoods have been linked to patterns of physical activity, yet untangling these relationships to promote increased levels of physical activity presents methodological challenges. Based on qualitative and quantitative data, this article describes patterns of activity within urban parks and the socio-demographic characteristics of park visitors. It also accounts for these patterns in relation to the attributes of parks and their surrounding neighbourhoods.Methods. A multiple case study was undertaken that incorporated quantitative and qualitative data derived from first-hand observation in a purposive sample of four urban parks. Quantitative data, based on direct observation of visitors' patterns of use and socio-demographic characteristics, were collected using a structured instrument. Differences in frequencies of observed activities and socio-demographic characteristics of visitors were compared between the four parks. Qualitative data, based on direct observation of park characteristics and patterns of use, were generated through digital photography and analyzed through captioning. Quantitative data on patterns in activity and socio-demographic characteristics were synthesized with the qualitative data on park and usage characteristics.Results: A comprehensive portrait of each park in the study was generated. Activity types (sedentary, walking, dog-related, cycling, and play), patterns of park use (time of day, day of week), and socio-demographic characteristics (age group, social group) differed between the four parks. Patterns in park use and activity appeared to be associated with socio-demographic characteristics of the surrounding neighbourhoods as well as the physical and social environmental characteristics specific to each park.Conclusions: Both park and neighbourhood characteristics influence patterns of use and physical activity within parks. The study findings suggest that socio-demographic characteristics of neighbourhoods surrounding parks need be considered in planning, development and management. Engaging local communities could help planners to develop and update urban parks in ways that reflect the needs and characteristics of community residents and, in turn, encourage visits and more physical activity amongst visitors

Highlighting the hidden dangers of a ‘weak’ opioid:Deaths following use of dihydrocodeine in England (2001–2020)

BackgroundDihydrocodeine (DHC) is considered a ‘weak’ opioid, but there is evidence of its increasing misuse in overdose deaths. This research aims to analyse trends in DHC-related deaths in England relevant to source and dose of DHC, and decedent demographics.MethodsCases from England reported to the National Programme on Substance Abuse Deaths (NPSAD) where DHC was identified at post-mortem and/or implicated in death between 2001 and 2020 were extracted for analysis.Results2071 DHC-related deaths were identified. The greatest number of deaths involved illicitly obtained DHC and a significant increase in these deaths was recorded over time (r = 0.5, p = 0.03). However, there was a concurrent decline in the implication rate of DHC in causing death (r = −0.6, p &lt; 0.01). Fatalities were primarily due to accidental overdose (64.8%) and misuse was highly prevalent in combination with additional central nervous system depressants (95.3%), namely illicit heroin/morphine and diazepam. In contrast, when DHC was obtained over-the-counter (OTC) suicide mortality accounted for almost half of the deaths (42.5%). Differences in polysubstance use were also identified, with less heroin/morphine and benzodiazepine co-detection, but increased OTC codeine co-detection.ConclusionsDHC misuse in England is increasing. The pharmacological consideration of DHC as a ‘weak’ opioid may be misinterpreted by users, leading to accidental overdosing. There is an urgent need to understand increasing polypharmacy in overdose deaths. Additionally, suicides involving DHC is a potential cause for concern and a review of OTC opioid-paracetamol preparations is necessary to determine whether the benefits of these medications continue to outweigh the risks of intentional overdose.</p