The importance of preventative maintenance on flow measurement instrumentation

Abstract: Process plants need to produce more and more to keep up with growing demand. However,  these plants are also becoming eroded and dysfunctional due to the lack of maintenance, in  this case preventative maintenance (PM). PM is the schedule or periodic checking, to detect  the  degradation  of  equipment  on  a  plant.  Achieving  such  maintenance  efficiently  and  effectively is a vital activity to ensure good, safe, and high product quality on a plant. This  research considers the technical personnel’s perception towards conducting preventative  maintenance on flow measuring instruments on their respective plants.   This research looks at the preventative maintenance activities that are required on flow meter  instrumentation. It also considers the impact of not conducting such maintenance and the  importance of this maintenance as perceived by technical personnel responsible for the plant.    Through literature review, primary preventative maintenance activities are presented. All  these activities need to take place in order to keep instruments from failing abruptly in order  to avoid degradation, profit losses and to minimize downtime on the process plant. A survey  in the form of a questionnaire was distributed using snowball methodology. 101 technical  personal in three different industries across the SADC region responded to the questions.  Each participant indicated where they were from and they type of plant they worked on. The  participant’s responses also included if they conducted preventive maintenance proactively  or not, as well as the impact of not conducting such maintenance...M.Phil. (Engineering Management

Improving the efficiency of estimation in the additive hazards model for stratified case-cohort design with multiple diseases

The case-cohort study design has often been used in studies of a rare disease or for a common disease with some biospecimens needing to be preserved for future studies. A case-cohort study design consists of a random sample, called the subcohort, and all or a portion of the subjects with the disease of interest. One advantage of the case-cohort design is that the same subcohort can be used for studying multiple diseases. Stratified random sampling is often used for the subcohort. Additive hazards models are often preferred in studies where the risk difference, instead of relative risk, is of main interest. Existing methods do not use the available covariate information fully. We propose a more efficient estimator by making full use of available covariate information for the additive hazards model with data from a stratified case-cohort design with rare (the traditional situation) and non-rare (the generalized situation) diseases. We propose an estimating equation approach with a new weight function. The proposed estimators are shown to be consistent and asymptotically normally distributed. Simulation studies show that the proposed method using all available information leads to efficiency gain and stratification of the subcohort improves efficiency when the strata are highly correlated with the covariates. Our proposed method is applied to data from the Atherosclerosis Risk in Communities (ARIC) study

Synergistic and Non-synergistic Associations for Cigarette Smoking and Non-tobacco Risk Factors for Cardiovascular Disease Incidence in the Atherosclerosis Risk In Communities (ARIC) Study

Cigarette smoking, various metabolic and lipid-related factors and hypertension are well-recognized cardiovascular disease (CVD) risk factors. Since smoking affects many of these factors, use of a single imprecise smoking metric, e.g., ever or never smoked, may allow residual confounding and explain inconsistencies in current assessments of interactions. Using a comprehensive model in pack-years and cigarettes/day for the complex smoking-related relative risk (RR) of CVD to reduce residual confounding, we evaluated interactions with non-tobacco risk factors, including additive (non-synergistic) and multiplicative (synergistic) forms. Data were from the prospective Atherosclerosis Risk in Communities (ARIC) Study from four areas of the U.S. recruited in 1987-89 with follow-up through 2008. Analyses included 14,127 participants, 207,693 person-years and 2,857 CVD events. Analyses revealed distinct interactions with smoking: including statistical consistency with additive (body mass index, waist to hip ratio, diabetes mellitus, glucose, insulin, high density lipoproteins [HDL] and HDL(2)); and multiplicative (hypertension, total cholesterol, low density lipoproteins, apolipoprotein B, total cholesterol to HDL ratio and HDL(3)) associations, as well as indeterminate (apolipoprotein A-I and triglycerides) associations. The forms of the interactions were revealing but require confirmation. Improved understanding of joint associations may help clarify the public health burden of smoking for CVD, links between etiologic factors and biological mechanisms, and the consequences of joint exposures, whereby synergistic associations highlight joint effects and non-synergistic associations suggest distinct contributions. Joint associations for cigarette smoking and non-tobacco risk factors were distinct, revealing synergistic/multiplicative (hypertension, TC, LDL, apoB, TC/HDL, HDL(3)), non-synergistic/additive (BMI, WHR, DM, glucose, insulin, HDL, HDL(2)) and indeterminate (apoA-I and TRIG) associations. If confirmed, these results may help better define the public health burden of smoking on CVD risk and identify links between etiologic factors and biologic mechanisms, where synergistic associations highlight joint impacts and non-synergistic associations suggest distinct contributions from each factor

The impact of interpersonal relationships on rural doctors’ clinical courage

Introduction: Clinical courage occurs when rural doctors push themselves to the limits of their scope of practice to provide the medical care needed by patients in their community. This mental strength to venture, persevere and act out of concern for one’s patient, despite a lack of formally recognised expertise, becomes necessary for doctors who work in relative professional isolation. Previous research by the authors suggested that the clinical courage of rural doctors relies on the relationships around them. This article explores in more depth how relationships with others can impact on clinical courage. Methods: At an international rural medicine conference in 2017, doctors who practised rural/remote medicine were invited to participate in the study. Twenty-seven semistructured interviews were conducted exploring experiences of clinical courage. Initial analysis of the material, using a hermeneutic phenomenological frame, sought to understand the meaning of clinical courage. In the original analysis, an emic question arose: ‘How do interpersonal relationships impact on clinical courage’. The material was re-analysed to explore this question, using Wenger’s community of practice as a theoretical framework. Results: This study found that clinical courage was affected by the relationships rural doctors had with their communities and patients, with each other, with the local members of their healthcare team and with other colleagues and health leaders outside their immediate community of practice. Conclusion: As a collective, rural doctors can learn, use and strengthen clinical courage and support its development in new members of the discipline. Relationships with rural communities, rural patients and urban colleagues can support the clinical courage of rural doctors. When detractors challenge the value of clinical courage, it requires individual rural doctors and their community of practice to champion rural doctors’ way of working

Prospective study of lung function and abdominal aortic aneurysm risk: The Atherosclerosis Risk in Communities study

Abstract Background and aims No prospective study has investigated whether individuals with respiratory impairments, including chronic obstructive pulmonary disease (COPD) and restrictive lung disease (RLD), are at increased risk of abdominal aortic aneurysm (AAA). We aimed to prospectively investigate whether those respiratory impairments are associated with increased AAA risk. Methods In 1987–1989, the Atherosclerosis Risk in Communities (ARIC) study followed 14,269 participants aged 45–64 years, without a history of AAA surgery, through 2011. Participants were classified into four groups, “COPD” [forced expiratory volume in 1 s (FEV1)/forced vital capacity (FVC) <lower limit of normal (LLN)], “RLD” (FEV1/FVC ≥ LLN and FVC < LLN), “respiratory symptoms with normal spirometry” (without RLD or COPD), and “normal” (without respiratory symptoms, RLD or COPD, reference group). Results During the 284,969 person-years of follow-up, 534 incident AAA events were documented. In an age, sex, and race-adjusted proportional hazards model, individuals with respiratory impairments had a significantly higher risk of AAA than the normal reference group. After adjustment for AAA risk factors, including smoking status and pack-years of smoking, AAA risk was no longer significant in the respiratory symptoms with normal spirometry group [HR (95% CI), 1.25 (0.98–1.60)], but was still increased in the other two groups [RLD: 1.45 (1.04–2.02) and COPD: 1.66 (1.34–2.05)]. Moreover, continuous measures of FEV1/FVC, FEV1 and FVC were associated inversely with risk of AAA. Conclusions In the prospective population-based cohort study, obstructive and restrictive spirometric patterns were associated with increased risk of AAA independent of smoking, suggesting that COPD and RLD may increase the risk of AAA. Highlights • No prospective study has examined the association between lung function and abdominal aortic aneurysm (AAA). • We examined this association using a prospective population-based study in the US. • Chronic obstructive pulmonary disease (COPD) and restrictive diseases patterns were associated with increased AAA risk. • This study suggested COPD and restrictive lung diseases may increase AAA risk

Exploring rural doctors’ early experiences of coping with the emerging COVID-19 pandemic

Purpose: To understand how rural doctors (physicians) responded to the emerging COVID-19 pandemic and their strategies for coping. Methods: Early in the pandemic doctors (physicians) who practise rural and remote medicine were invited to participate through existing rural doctors’ networks. Thirteen semi-structured interviews were conducted with rural doctors from 11 countries. Interviews were transcribed verbatim and coded using NVivo. A thematic analysis was used to identify common ideas and narratives. Findings: Participants’ accounts described highly adaptable and resourceful responses to address the crisis. Rapid changes to organizational and clinical practices were implemented, at a time of uncertainty, anxiety, and fear, and with limited information and resources. Strong relationships and commitment to their colleagues and communities were integral to shaping and sustaining these doctors’ responses. We identified five common themes underpinning rural doctors’ shared experiences: (1) caring for patients in a context of uncertainty, fear, and anxiety; (2) practical solutions through improvising and being resourceful; (3) gaining community trust and cooperation; (4) adapting to unrelenting pressures; and (5) reaffirming commitments. These themes are discussed in relation to the Lazarus and Folkman stress and coping model. Conclusions: With limited resources and support, these rural doctors’ practical responses to the COVID-19 crisis underscore strong problem-focused coping strategies and shared commitments to their communities, patients, and colleagues. They drew support from sharing experiences with peers (emotion-focused coping) and finding positive meanings in their experiences (meaning-based coping). The psychosocial impact on rural doctors working at the limits of their adaptive resources is an ongoing concern

Naltrexone and combined behavioral intervention effects on trajectories of drinking in the COMBINE study

Objective—COMBINE is the largest study of pharmacotherapy for alcoholism in the United States to date, designed to answer questions about the benefits of combining behavioral and pharmacological interventions. Trajectory-based analyses of daily drinking data allowed identification of distinct drinking trajectories in smaller studies and demonstrated significant naltrexone effects even when primary analyses on summary drinking measures were unsuccessful. The objective of this study was to replicate and refine trajectory estimation and to assess effects of naltrexone, acamprosate and therapy on the probabilities of following particular trajectories in COMBINE. It was hypothesized that different treatments may affect different trajectories of drinking. Methods—We conducted exploratory analyses of daily indicators of any drinking and heavy drinking using a trajectory-based approach and assessed trajectory membership probabilities and odds ratios for treatment effects. Results—We replicated the trajectories (“abstainer”, “sporadic drinker”, “consistent drinker”) established previously in smaller studies. However, greater numbers of trajectories better described the heterogeneity of drinking over time. Naltrexone reduced the chance to follow a “nearly daily” trajectory and Combined Behavioral Intervention (CBI) reduced the chance to be in an “increasing to nearly daily” trajectory of any drinking. The combination of naltrexone and CBI increased the probability of membership in a trajectory in which the frequency of any drinking declined over time. Trajectory membership was associated with different patterns of treatment compliance. Conclusion—The trajectory-analyses identified specific patterns of drinking that were differentially influenced by each treatment and provided support for hypotheses about the mechanisms by which these treatments work

Exploration of rural physicians' lived experience of practising outside their usual scope of practice to provide access to essential medical care (clinical courage): an international phenomenological study

Objectives Rural doctors describe consistent pressure to provide extended care beyond the limits of their formal training in order to meet the needs of the patients and communities they serve. This study explored the lived experience of rural doctors when they practise outside their usual scope of practice to provide medical care for people who would otherwise not have access to essential clinical services. Design A hermeneutic phenomenological study. Setting An international rural medicine conference. Participants All doctors attending the conference who practised medicine in rural/remote areas in a predominantly English-speaking community were eligible to participate; 27 doctors were recruited. Interventions Semi-structured interviews were conducted. The transcripts were initially read and analysed by individual researchers before they were read aloud to the group to explore meanings more fully. Two researchers then reviewed the transcripts to develop the results section which was then rechecked by the broader group. Primary outcome measure An understanding of the lived experiences of clinical courage. Results Participants provided in-depth descriptions of experiences we have termedclinical courage. This phenomenon included the following features: Standing up to serve anybody and everybody in the community; Accepting uncertainty and persistently seeking to prepare; Deliberately understanding and marshalling resources in the context; Humbly seeking to know one's own limits; Clearing the cognitive hurdle when something needs to be done for your patient; Collegial support to stand up again. Conclusion This study elucidated six features of the phenomenon ofclinical couragethrough the narratives of the lived experience of rural generalist doctors

Television, physical activity, diet, and body weight status: the ARIC cohort

<p>Abstract</p> <p>Background</p> <p>Television (TV) watching is the most common leisure activity in the United States. Few studies of adults have described the relationship between TV and health behaviors such as physical activity, diet, and body weight status.</p> <p>Methods</p> <p>Extant data from the Atherosclerosis Risk in Communities (ARIC) Study were analyzed to assess the association of TV with physical activity, diet, and body mass index (BMI) among 15,574 adults at baseline (1986–89) and 12,678 adults six years later. Television, physical activity, and diet were collected with questionnaires and BMI was measured at both time points. Based on baseline TV exposure, adults were categorized into high, medium, and low TV exposure. Linear and logistic regression models were adjusted for gender, age, race-center, smoking, education, and general health.</p> <p>Results</p> <p>Relative to participants who had low TV exposure, those with high TV exposure were more likely to be less physically active and have a poorer dietary profile at baseline and six-years later. Participants with high TV exposure at baseline had a 40% and 31% greater odds of being considered insufficiently active at baseline (1.40, 95% CI 1.26, 1.55), and six years later (1.31, 95% CI 1.18, 1.46). At baseline, high TV exposure was also associated with a 20% to 30% greater odds of being above the median for servings of salty snacks (1.37, 95% CI 1.24, 1.51), sweets (1.26, 95% CI 1.15, 1.38), and sweetened drinks (1.29, 95% CI 1.17, 1.42), and below the median for fruit and vegetable servings (1.36, 95% CI 1.24, 1.50). Higher TV exposure was also cross-sectionally associated with a greater odds for being overweight or obese (1.43, 95% CI 1.29, 1.58). Similar associations were observed between baseline TV exposure and six-year physical activity and diet, but were not observed with BMI after six years follow-up.</p> <p>Conclusion</p> <p>These results support the hypothesis that time spent watching TV is associated with deleterious effects on physical activity, diet, and BMI.</p