Burg algorithm for enhancing measurement performance in wavelength scanning interferometry

Wavelength scanning interferometry (WSI) is a technique for measuring surface topography that is capable of resolving step discontinuities and does not require any mechanical movement of the apparatus or measurand, allowing measurement times to be reduced substantially in comparison to related techniques. The axial (height) resolution and measurement range in WSI depends in part on the algorithm used to evaluate the spectral interferograms. Previously reported Fourier transform based methods have a number of limitations which is in part due to the short data lengths obtained. This paper compares the performance auto-regressive model based techniques for frequency estimation in WSI. Specifically, the Burg method is compared with established Fourier transform based approaches using both simulation and experimental data taken from a WSI measurement of a step-height sample

The application of parametric estimation techniques to wavelength scanning interferometry

The growth in the manufacture of complex surfaces means that surface metrology has become an essential part of the manufacturing process in many industries. Wavelength scanning interferometry (WSI) is a technique that enables fast surface topography measurement. Since WSI can be implemented without the measurand or apparatus being mechanically moved, the measurement times are substantially less than other topography techniques that require mechanical movement. A variety of algorithms can be used to evaluate the spectral interferograms generated from WSI, and the choice of algorithm affects the axial (height) resolution and measurement range that can be attained. At present Fourier transform based methods are the most commonly used, but these can have a number of limitations, including problems which derive from short data lengths. In order to extend the measurement range of the WSI, frequency estimation techniques based on an auto-regressive model are introduced. In particular, the Burg method is suggested as an alternative to current algorithms and a comparison is made to Fourier-transform methods using both simulated data and experimental data of a step-height sample measured using WSI

Patient and Public Involvement (PPI) and Responsible Research and Innovation (RRI) approaches in mental health projects involving young people: a scoping review protocol

Background: Rather than being perceived as merely ‘part of the problem’, the perspectives and experiences of young people play a pivotal role in devising effective solutions for mental health challenges. Two distinct methodologies that aid in this endeavour are ‘patient and public involvement’ (PPI) and ‘responsible research and innovation’ (RRI). However, there is a tendency to conflate PPI and RRI practices, leading to ambiguity in their application. Moreover, the extent and nature of young people’s involvement in mental health-related projects (namely: research, intervention, product development) employing these methodologies, and the subsequent implications thereof, remain unclear. Consequently, the proposed scoping review aims to identify and analyse literature pertaining to PPI and RRI approaches in mental health projects that engage young people in collaboration. Methods: The selected databases will be MEDLINE, PsycINFO, PsycArticles, Scopus, Web of Science, IBBS, CINAHL (EBSCO) and ASSIA. Comprehensive searches will span from the inception of each database. A pilot test will be conducted to assess the screening criteria and data extraction form, with two authors independently reviewing titles and abstracts. Full-text articles meeting the inclusion criteria will undergo narrative syntheses, with results presented in tabular format. Feedback on the findings from a youth perspective will be sought from young people within our broader research network, namely Sprouting Minds. The review will adhere to the guidelines outlined by the Joanna Briggs Institute (JBI) and follow the PRISMA-ScR procedures. Inclusion criteria will comprise English-language, primary research peer-reviewed articles focused on Patient and Public Involvement (PPI) or Responsible Research and Innovation (RRI), examining mental health-related research processes, interventions, and products developed in collaboration with young people. Studies employing quantitative, qualitative, and mixed-methods approaches will be considered, while non-journal publications will be excluded. Discussion: The intended scoping review aims to map the literature concerning mental health-related projects that engage with young people through PPI or RRI approaches. The outcomes hold promise for enriching the participatory research domain, particularly in studies centred on young people and their mental well-being. Furthermore, by delineating potential overlaps and distinctions between PPI and RRI, the findings stand to aid mental health researchers and practitioners in making informed decisions about the most suitable approach for their projects when partnering with young individuals. Systematic review registration: Open Science Framework (registration: DOI https://doi.org/10.17605/OSF.IO/N4EDB)

"It's not just about walking.....it's the practice nurse that makes it work": a qualitative exploration of the views of practice nurses delivering complex physical activity interventions in primary care

Background: Physical activity (PA) is important for physical and mental health in adults and older adults. Interventions incorporating theory-based behaviour change techniques (BCTs) can be useful in helping people to increase their PA levels and can be delivered by practice nurses in primary care. We undertook two primary care based complex walking interventions among adults and older adults. Both interventions were underpinned by BCTs and delivered by practice nurses and we sought their views and experiences of delivering over 1400 complex PA consultations.  Methods: Semi structured interviews with two practice nurse groups (n = 4 and n = 5) and two individual interviews (total n = 11) were conducted by independent facilitators; audio-recorded, transcribed verbatim and analysed using thematic analysis.  Results: Five key themes emerged as enablers and/or barriers to delivering the intervention: preparation and training; initial and ongoing support; adherence to the protocol; the use of materials and equipment; and engagement of participants. The themes were organised into a framework of 'pre-trial' and 'delivery of the intervention'. Two additional 'post-trial' themes were identified; changed practice and the future feasibility of the intervention. Nurses believed that taking part in the trial, especially the BCT training, enhanced the quality and delivery of advice and support they provided within routine consultations, although the lack of time available routinely makes this challenging.  Conclusion: Delivering an effective behaviour change intervention in primary care requires adequate training and support for practice nurses both initially and throughout the trial as well as adequate consultation time. Enhanced skills from participating in such trials can lead to long-term changes, including more patient-centred consulting.  Trial registration: PACE-Lift ISRCTN 42122561, PACE-UP ISRCTN 98538934

Insights on conducting digital patient and public involvement in dementia research during the COVID-19 pandemic: supporting the development of an “E-nabling digital co-production” framework

BackgroundThe rapid transition to digital working, accelerated due to the response to the COVID-19 pandemic, has impacted the involvement of patients and public in research. This paper presents experiences of engaging in digital Patient and Public Involvement (e-PPI) in dementia research since the lockdowns, offering recommendations regarding future digital and hybrid working. Furthermore, it introduces a co-produced framework for researchers, PPI coordinators and public contributors to identify and discuss challenges and opportunities provided by e-PPI.MethodsTwo online workshops and one individual interview were performed with a group of researchers and PPI coordinators with experience in PPI in dementia research, and with an existing dementia PPI group having some experience of working online during the pandemic. The project was constructed as a PPI activity, with the MindTech Involvement Team (PPI group) involved in the entire process, and a collaborative data analysis process was adopted.ResultsAfter refinement of the coding structure, the MindTech Involvement Team and Project Leaders identified four main themes, resulting in the ‘E-nabling Digital Co-production' Framework. During this framework development, different positions were expressed, associated with the transition to digital working. Two main themes were shared by the participating groups regarding e-PPI: wider potential reach without geographical constraints, and the perception of more business-like sessions with reduced opportunities for social interactions and communication. Specifically for dementia research, whilst e-PPI may allow public contributors to attend more meetings, potentially mutually supportive environments provided by face-to-face meetings could be diminished, with carers experiencing a possible reduction in informal respite opportunities.ConclusionsThrough involving public contributors, researchers, and PPI coordinators with a focus on digital PPI in dementia research, we were able to further refine and co-produce the ‘E-nabling Digital Co-production' Framework. Demonstrating potential for analysis of benefits and limitations within e-PPI, it was possible to identify both general insights and those specific to dementia research. However, the most significant contribution of the framework is the potential to support local journeys of co-production in ongoing digital and hybrid public involvement activities

Working together: reflections on how to make public involvement in research work

YesThe importance of involving members of the public in the development, implementation and dissemination of research is increasingly recognised. There have been calls to share examples of how this can be done, and this paper responds by reporting how professional and lay researchers collaborated on a research study about falls prevention among older patients in English acute hospitals. It focuses on how they worked together in ways that valued all contributions, as envisaged in the UK standards for public involvement for better health and social care research. The paper is itself an example of working together, having been written by a team of lay and professional researchers. It draws on empirical evidence from evaluations they carried out about the extent to which the study took patient and public perspectives into account, as well as reflective statements they produced as co-authors, which, in turn, contributed to the end-of-project evaluation. Lay contributors' deep involvement in the research had a positive effect on the project and the individuals involved, but there were also difficulties. Positive impacts included lay contributors focusing the project on areas that matter most to patients and their families, improving the quality and relevance of outcomes by contributing to data analysis, and feeling they were 'honouring' their personal experience of the subject of study. Negative impacts included the potential for lay people to feel overwhelmed by the challenges involved in achieving the societal or organisational changes necessary to address research issues, which can cause them to question their rationale for public involvement. The paper concludes with practical recommendations for working together effectively in research. These cover the need to discuss the potential emotional impacts of such work with lay candidates during recruitment and induction and to support lay people with these impacts throughout projects; finding ways to address power imbalances and practical challenges; and tips on facilitating processes within lay groups, especially relational processes like the development of mutual trust.Funded by the National Institute for Health Research (NIHR) Health and Social Care Delivery Research (HSDR) Programme (Project Number NIHR129488)

Drivers of the composition and diversity of carabid functional traits in UK coniferous plantations.

Functional diversity (FD) is increasingly used as a metric to evaluate the impact of forest management strategies on ecosystem functioning. Management interventions that aim to maximise FD require knowledge of multiple environmental drivers of FD, which have not been studied to date in temperate coniferous production forests. We quantified the relative importance of abiotic (forest management) and biotic (ground vegetation community) drivers of carabid FD and trait distribution in 44 coniferous plantation forest stands across the UK. Carabid FD declined with canopy cover and carabid body length correlated negatively with the percentage of open semi-natural area surrounding a plot. We conclude that forest management could enhance carabid FD through initiatives that emulate natural disturbance regimes through gap creation. We found that neither functional nor taxonomic metrics of vegetation diversity correlated with carabid FD, suggesting that restoration of plant communities, a major goal of forest restoration efforts, will not necessarily enhance carabid FD in coniferous plantations

Standards of conduct and reporting in evidence syntheses that could inform environmental policy and management decisions

Accurate, unbiased and concise synthesis of available evidence following clear methodology and transparent report‑ ing is necessary to support effective environmental policy and management decisions. Without this, less reliable and/ or less objective reviews of evidence could inform decision making, leading to ineffective, resource wasteful inter‑ ventions with potential for unintended consequences. We evaluated the reliability of over 1000 evidence syntheses (reviews and overviews) published between 2018 and 2020 that provide evidence on the impacts of human activities or effectiveness of interventions relevant to environmental management. The syntheses are drawn from the Col‑ laboration for Environmental Evidence Database of Evidence Reviews (CEEDER), an online, freely available evidence service for evidence users that assesses the reliability of evidence syntheses using a series of published criteria. We found that the majority of syntheses have problems with transparency, replicability and potential for bias. Overall, our results suggest that most recently published evidence syntheses are of low reliability to inform decision making. Reviews that followed guidance and reporting standards for evidence synthesis had improved assessment ratings, but there remains substantial variation in the standard of reviews amongst even these. Furthermore, the term ‘system‑ atic review’, which implies conformity with a methodological standard, was frequently misused. A major objective of the CEEDER project is to improve the reliability of the global body of environmental evidence reviews. To this end we outline freely available online resources to help improve review conduct and reporting. We call on authors, editors and peer reviewers to use these resources to ensure more reliable syntheses in the future

What are the health benefits of active travel? A systematic review of trials and cohort studies.

BACKGROUND: Increasing active travel (primarily walking and cycling) has been widely advocated for reducing obesity levels and achieving other population health benefits. However, the strength of evidence underpinning this strategy is unclear. This study aimed to assess the evidence that active travel has significant health benefits. METHODS: The study design was a systematic review of (i) non-randomised and randomised controlled trials, and (ii) prospective observational studies examining either (a) the effects of interventions to promote active travel or (b) the association between active travel and health outcomes. Reports of studies were identified by searching 11 electronic databases, websites, reference lists and papers identified by experts in the field. Prospective observational and intervention studies measuring any health outcome of active travel in the general population were included. Studies of patient groups were excluded. RESULTS: Twenty-four studies from 12 countries were included, of which six were studies conducted with children. Five studies evaluated active travel interventions. Nineteen were prospective cohort studies which did not evaluate the impact of a specific intervention. No studies were identified with obesity as an outcome in adults; one of five prospective cohort studies in children found an association between obesity and active travel. Small positive effects on other health outcomes were found in five intervention studies, but these were all at risk of selection bias. Modest benefits for other health outcomes were identified in five prospective studies. There is suggestive evidence that active travel may have a positive effect on diabetes prevention, which may be an important area for future research. CONCLUSIONS: Active travel may have positive effects on health outcomes, but there is little robust evidence to date of the effectiveness of active transport interventions for reducing obesity. Future evaluations of such interventions should include an assessment of their impacts on obesity and other health outcomes