Real space analysis of operando X-ray spectroscopy and scattering studies of Cobalt Fischer-Tropsch Synthesis catalysts

Size effects on Co-based Fischer Tropsch synthesis (FTS) catalysts are well known, however their evolution over time is less well interrogated. Three key issues related to particle size remain: the behaviour of small Co0 nanoparticles during FTS and their potential re-oxidation, the evolution and influence of the Co0 nanostructure (fcc/hcp/intermixed Co0), and the formation of metal-support interactions during FTS. Two synthesis methods were used to produce Co/SiO2 catalysts. The first experimental chapter concerns the application of an inverse micelle synthesis (IMS) method for preparing powder-supported FTS catalysts. The aim was to create a catalyst with tight particle size control in order to better study particle size effects, however this was limited by the difficulty in removing the surfactant. While the final two experimental chapters focus on operando characterization using synchrotron-based X-ray techniques for two different sized catalysts synthesized using a standard Schlenk technique; 3 and 11 nm which fall below and above the stable size range respectively. Novel Debye simulations using a unic model were applied to synchrotron-based X-Ray diffraction (XRD) data acquired from a working FTS catalyst. While the 11 nm particle size catalyst is stable, this analysis shows a small variation in the hcp/fcc/intermixed ratio over the first 12 h of FTS, possible related to a known drop in activity during the initial stages of FTS. The hcp fraction decreases by -5.03 %, fcc increase by 1.24 %, and the mixed block increase by 3.7 %. About 20 % of the initial sample is unreduced CoO which reduces very slightly under FTS conditions. The majority of the Co0 content in the 3 nm sample oxidizes in the first hour of exposure to FTS conditions, although some of the larger Co0 particles remain active - as observed by XRD. Additionally, no support phases are observed initially or being formed during FTS on either of the different average particle sized catalysts

Bending the Medicare Cost Curve in 12 Months or Less: How Preventative Health Care can Yield Significant Near-Term Savings for Acute Care in Alberta

Over the course of more than 30 years, a series of Canadian government commissions and health policy researchers have repeatedly identified the importance of “bending the cost curve” to sustain publicly funded health care, and the potential to do so through upstream investment in health promotion and disease prevention. So far, however, the level of public investment in prevention represents only a slight portion of total public health care expenditure, largely consisting of traditional public health initiatives such as vaccinations, disease screening and information campaigns. This study of the Pure North S’Energy Foundation’s preventative health care program — wherein health care usage by program participants was measured against age- and sex-matched control samples — finds that the sort of preventative health care services offered by Pure North can lead to genuine and significant near-term cost savings for Canada’s single-payer health care system. Participants in the first year of the program required 25 per cent fewer hospital visits and 17 per cent fewer emergency room visits compared to the control group. Among those who persisted in the program for a year or longer, the effects were even more significant: 45 per cent fewer hospital visits in the year after joining, and 28 per cent fewer visits to emergency departments, compared to the control group. This represents real cost savings for a public health service: From $388 per person who joined the program to$677 per person who persisted beyond the first year. As a proportion of annual health spending for these participants on hospitals, emergency departments and general practitioners, this represents a cost reduction ranging from 22 to 39 per cent. If the Alberta government were able to implement this kind of program provincewide (at an estimated cost of $500 per participant), and were to realize similar results in terms of reduced strain on acute care services, it is possible that the province could free-up the equivalent of 1,632 hospital beds every year. That is roughly the same as building two entirely new hospitals each on the scale of Calgary’s Foothills Medical Centre. This demonstrates that “bending the cost curve” for public health care spending is not merely something that is realizable in the long term, but rather in the immediate future, as quickly as within a year after this kind of program could be implemented province-wide. And yet, the near-term savings in acute care services represent only the first wave of benefits. The prevalence of chronic diseases and conditions, including diabetes, heart disease, cancer and mental illness, have been rising and are projected to keep doing so over the coming decade. The Pure North program aims to prevent and address these health conditions and chronic diseases through a combination of screening and testing, lifestyle modification, nutrition education, the identification of nutritional deficiencies, and dietary supplements. The long-term benefits of a Pure North-style program implemented province-wide in Alberta are likely to be that much greater as the prevalence of diabetes, heart disease, cancer and mental illness is tempered through the use of widespread preventative care. Then there are the broader “indirect benefits” of a generally healthier population: higher labour productivity, higher incomes and greater well-being. These returns to the Alberta government, and taxpayer, have the potential to be as large, if not larger, than the direct benefits of significantly reduced acute care costs

Discrete mode laser diodes with ultra narrow linewidth emission <3kHz

Ex-facet, free-running ultra-low linewidth (<3 kHz), single mode laser emission is demonstrated using low cost, regrowth-free ridge waveguide discrete mode Fabry-Perot laser diode chips

Miscarriage, Preterm Delivery, and Stillbirth: Large Variations in Rates within a Cohort of Australian Women

Objectives We aimed to use simple clinical questions to group women and provide their specific rates of miscarriage, preterm delivery, and stillbirth for reference. Further, our purpose was to describe who has experienced particularly low or high rates of each event. Methods Data were collected as part of the Australian Longitudinal Study on Women's Health, a national prospective cohort. Reproductive histories were obtained from 5806 women aged 31–36 years in 2009, who had self-reported an outcome for one or more pregnancy. Age at first birth, number of live births, smoking status, fertility problems, use of in vitro fertilisation (IVF), education and physical activity were the variables that best separated women into groups for calculating the rates of miscarriage, preterm delivery, and stillbirth. Results Women reported 10,247 live births, 2544 miscarriages, 1113 preterm deliveries, and 113 stillbirths. Miscarriage was correlated with stillbirth (r = 0.09, P<0.001). The calculable rate of miscarriage ranged from 11.3 to 86.5 miscarriages per 100 live births. Women who had high rates of miscarriage typically had fewer live births, were more likely to smoke and were more likely to have tried unsuccessfully to conceive for ≥12 months. The highest proportion of live preterm delivery (32.2%) occurred in women who had one live birth, had tried unsuccessfully to conceive for ≥12 months, had used IVF, and had 12 years education or equivalent. Women aged 14–19.99 years at their first birth and reported low physical activity had 38.9 stillbirths per 1000 live births, compared to the lowest rate at 5.5 per 1000 live births. Conclusion Different groups of women experience vastly different rates of each adverse pregnancy event. We have used simple questions and established reference data that will stratify women into low- and high-rate groups, which may be useful in counselling those who have experienced miscarriage, preterm delivery, or stillbirth, plus women with fertility intent

Laying the Foundation for Policy: Measuring Local Prevalence for Autism Spectrum Disorder

Claims have been made that families with children living with autism spectrum disorders (ASD) have been migrating to Alberta because of higher funding available for ASD supports compared to other provinces. The legitimacy of these claims, along with many others about the adequacy or inadequacy of funding for supporting persons living with ASD, has not been evaluated because we simply don’t know how many people in Alberta are living with ASD. Typically in Canada, ASD prevalence is reported in national figures, based on international estimates. Canadian prevalence estimates for ASD are needed. With no national surveillance system in place, national estimates are difficult to determine. In addition, such broad measurements are problematic as they may not adequately inform the service delivery needs for specific jurisdictions. A new study shows that 1,711, or 1 in 94, school age children in the Calgary region have an ASD diagnosis. As this number matches what is often reported for the national prevalence of ASD, it suggests that Alberta’s relatively higher ASD funding is not inducing in-migration of families seeking better support. The data also show that the prevalence is higher in elementary-grade children, with a diagnosis in one of every 86 children. In the senior grades, there are significantly fewer students with ASD diagnoses, specifically within the Calgary Board of Education. There is no evident reason for diagnoses to seemingly dematerialize in the older grades. These students could be dropping out or choosing home-schooling in greater numbers. Possibly there has been an increase in prevalence. These prevalence estimates help to inform the demand for special-needs services within the local school system. In addition, there is growing concern that upon graduation there is a “support cliff” resulting from a less systematized, less generous support system available for adults with neurodevelopmental disability. Families that need support for ASD face enough challenges; it is critical for policy-makers to be aware of the extent of the situation in their own jurisdiction so as to develop the right kinds of supports for these families

Health effects of the Federal Bureau of Prisons tobacco ban

BACKGROUND: Tobacco smoking remains the leading cause of preventable death in America, claiming 450,000 lives annually. Chronic Obstructive Pulmonary Disease, caused by smoking in the vast majority of cases, became the third leading cause of death in the U.S. in 2008. The burden of asthma, often exacerbated by tobacco exposure, has widespread clinical and public health impact. Despite this considerable harm, we know relatively little about the natural history of lung disease and respiratory impairment in adults, especially after smoking cessation. METHODS/DESIGN: Our paper describes the design and rationale for using the 2004 Federal Bureau of Prisons tobacco ban to obtain insights into the natural history of respiratory diseases in adult men and women of different races/ethnicities who are imprisoned in federal medical facilities. We have developed a longitudinal study of new prison arrivals, with data to be collected from each participant over the course of several years, through the use of standardized questionnaires, medical chart reviews, lung function tests, six-minute walk tests, and stored serum for the analysis of present and future biomarkers. Our endpoints include illness exacerbations, medication and health services utilization, lung function, serum biomarkers, and participants\u27 experience with their health and nicotine addiction. DISCUSSION: We believe the proposed longitudinal study will make a substantial contribution to the understanding and treatment of respiratory disease and tobacco addiction

Development of lifetime comorbidity in the world health organization world mental health surveys

CONTEXT: Although numerous studies have examined the role of latent variables in the structure of comorbidity among mental disorders, none has examined their role in the development of comorbidity. OBJECTIVE: To study the role of latent variables in the development of comorbidity among 18 lifetime DSM-IV disorders in the World Health Organization World Mental Health Surveys. DESIGN: Nationally or regionally representative community surveys. SETTING: Fourteen countries. PARTICIPANTS: A total of 21 229 survey respondents. MAIN OUTCOME MEASURES: First onset of 18 lifetime DSM-IV anxiety, mood, behavior, and substance disorders assessed retrospectively in the World Health Organization Composite International Diagnostic Interview. RESULTS: Separate internalizing (anxiety and mood disorders) and externalizing (behavior and substance disorders) factors were found in exploratory factor analysis of lifetime disorders. Consistently significant positive time-lagged associations were found in survival analyses for virtually all temporally primary lifetime disorders predicting subsequent onset of other disorders. Within-domain (ie, internalizing or externalizing) associations were generally stronger than between-domain associations. Most time-lagged associations were explained by a model that assumed the existence of mediating latent internalizing and externalizing variables. Specific phobia and obsessive-compulsive disorder (internalizing) and hyperactivity and oppositional defiant disorders (externalizing) were the most important predictors. A small number of residual associations remained significant after controlling the latent variables. CONCLUSIONS: The good fit of the latent variable model suggests that common causal pathways account for most of the comorbidity among the disorders considered herein. These common pathways should be the focus of future research on the development of comorbidity, although several important pairwise associations that cannot be accounted for by latent variables also exist that warrant further focused study