Finite difference time domain modeling of steady state scattering from jet engines with moving turbine blades

The approach chosen to model steady state scattering from jet engines with moving turbine blades is based upon the Finite Difference Time Domain (FDTD) method. The FDTD method is a numerical electromagnetic program based upon the direct solution in the time domain of Maxwell's time dependent curl equations throughout a volume. One of the strengths of this method is the ability to model objects with complicated shape and/or material composition. General time domain functions may be used as source excitations. For example, a plane wave excitation may be specified as a pulse containing many frequencies and at any incidence angle to the scatterer. A best fit to the scatterer is accomplished using cubical cells in the standard cartesian implementation of the FDTD method. The material composition of the scatterer is determined by specifying its electrical properties at each cell on the scatterer. Thus, the FDTD method is a suitable choice for problems with complex geometries evaluated at multiple frequencies. It is assumed that the reader is familiar with the FDTD method

Epigenetic modelling of former, current and never smokers

BACKGROUND: DNA methylation (DNAm) performs excellently in the discrimination of current and former smokers from never smokers, where AUCs > 0.9 are regularly reported using a single CpG site (cg05575921; AHRR). However, there is a paucity of DNAm models which attempt to distinguish current, former and never smokers as individual classes. Derivation of a robust DNAm model that accurately distinguishes between current, former and never smokers would be particularly valuable to epidemiological research (as a more accurate smoking definition vs. self-report) and could potentially translate to clinical settings. Therefore, we appraise 4 DNAm models of ternary smoking status (that is, current, former and never smokers): methylation at cg05575921 (AHRR model), weighted scores from 13 CpGs created by Maas et al. (Maas model), weighted scores from a LASSO model of candidate smoking CpGs from the literature (candidate CpG LASSO model), and weighted scores from a LASSO model supplied with genome-wide 450K data (agnostic LASSO model). Discrimination is assessed by AUC, whilst classification accuracy is assessed by accuracy and kappa, derived from confusion matrices. RESULTS: We find that DNAm can classify ternary smoking status with reasonable accuracy, including when applied to external data. Ternary classification using only DNAm far exceeds the classification accuracy of simply assigning all classes as the most prevalent class (63.7% vs. 36.4%). Further, we develop a DNAm classifier which performs well in discriminating current from former smokers (agnostic LASSO model AUC in external validation data: 0.744). Finally, across our DNAm models, we show evidence of enrichment for biological pathways and human phenotype ontologies relevant to smoking, such as haemostasis, molybdenum cofactor synthesis, body fatness and social behaviours, providing evidence of the generalisability of our classifiers. CONCLUSIONS: Our findings suggest that DNAm can classify ternary smoking status with close to 65% accuracy. Both the ternary smoking status classifiers and current versus former smoking status classifiers address the present lack of former smoker classification in epigenetic literature; essential if DNAm classifiers are to adequately relate to real-world populations. To improve performance further, additional focus on improving discrimination of current from former smokers is necessary. SUPPLEMENTARY INFORMATION: The online version contains supplementary material available at 10.1186/s13148-021-01191-6

Analysis of an Extensive Reading Program

This paper seeks to expand on findings from a SILC project undertaken in the 2011/12 academic year, which examined the implementation of an Extensive Reading (ER) program into the EC4 curriculum. Since that time, extensive reading has become an integral element of both the EC3 and EC4 curricula. The expansion of the program since its inception in 2011 has created new challenges and also necessitated continued research to assess its on-going effectiveness. Thin study will analyse how well the expanded program is supporting established extensive reading principles, and also look at student performance within the program, with a particular focus on data gathered from Moodle Reader

Improving 3D medical image registration CUDA software with genetic programming

Genetic Improvement (GI) is shown to optimise, in some cases by more than 35%, a critical component of health-care industry software across a diverse range of six nVidia graphics processing units (GPUs). GP and other search based software engineering techniques can automatically op-timise the current rate limiting CUDA parallel function in the Nifty Reg open source C++ project used to align or reg-ister high resolution nuclear magnetic resonance NMRI and other diagnostic NIfTI images. Future Neurosurgery tech-niques will require hardware acceleration, such as GPGPU, to enable real time comparison of three dimensional in the-atre images with earlier patient images and reference data. With millimetre resolution brain scan measurements com-prising more than ten million voxels the modified kernel can process in excess of 3 billion active voxels per second

Lost Voices in Research: Exposing the Gaps in the Mental Capacity Act 2005

Despite laudable intentions, since its inception, the Mental Capacity Act 2005 of England and Wales (MCA) has proved to be a controversial piece of legislation. The majority of legal scholarship has concentrated on the problems created by the Act in relation to the treatment of incapacitated patients. However, there is an additional and somewhat unexplored dimension to the MCA, that of research. We argue here that the research provisions of the MCA are poorly drafted and do not provide an appropriate balance between protection and empowerment. We also assert that contrasting obligations and expectations are placed on different parties in the approval process, which creates a blurred sense of responsibility and a potential chilling effect

Inclusion under the Mental Capacity Act (2005) : a review of research policy guidance and governance structures in England and Wales

Objective: To investigate how people with communication and understanding difficulties, associated with conditions such as dementia, autism and intellectual disability, are represented in research guidance supplementary to the Mental Capacity Act (MCA: 2005) in England and Wales. Methods: A documentary survey was conducted. The sample comprised the MCA Code of Practice (CoP: 2007) and 14 multi-authored advisory documents that were publicly available on the Health Research Authority website. Textual review of key words was conducted followed by summative content analysis. Results: Representation of people with communication and understanding difficulties was confined to procedural information and position statements that focused mainly on risk management and protection. Whilst a need to engage potential participants was recognised, guidance provided was imprecise. Conclusions: Tensions exist between the protection versus empowerment of people with communication and understanding difficulties in research. The development of structured, evidence-based guidance is indicated. Patient or public contribution: People with communication and understanding difficulties and carers participated in a working group to explore, discuss and interpret the findings

Perception, cognition, and delusion:Commentary on Firestone and Scholl

AbstractFirestone &amp; Scholl's (F&amp;S) critique of putative empirical evidence for the cognitive penetrability of perception focuses on studies of neurologically normal populations. We suggest that a comprehensive exploration of the cognition–perception relationship also incorporate work on abnormal perception and cognition. We highlight the prominence of these issues in contemporary debates about the formation and maintenance of delusions.</jats:p