A new algorithm for modelling photoionising radiation in smoothed particle hydrodynamics

We present a new fast algorithm which allows the simulation of ionising radiation emitted from point sources to be included in high-resolution three-dimensional smoothed particle hydrodynamics simulations of star cluster formation. We employ a Str\"omgren volume technique in which we use the densities of particles near the line-of-sight between the source and a given target particle to locate the ionisation front in the direction of the target. Along with one--dimensional tests, we present fully three--dimensional comparisons of our code with the three--dimensional Monte-Carlo radiative transfer code, MOCASSIN, and show that we achieve good agreement, even in the case of highly complex density fields.Comment: 10 pages, 7 figures, submitted to MNRA

Contribution of integrated farm management (IFM) to Defra objectives

A farming system comprises a complex of interrelated and interacting factors. Any study of an isolated part of the system will not provide adequate understanding of the behaviour of the entire system and interactions may be equally or more important than individual components. There is therefore a requirement for the development of integrated approaches and practices to help farming systems adapt to, eliminate or reduce the negative impacts of production on the environment. This must be achieved whilst maintaining the economic viability of the farm enterprise. Our analysis has confirmed that IFM techniques generally have far more beneficial than adverse effects on current Defra policy objectives. However, there are some notable ‘conflicts’ where a technique that has a large beneficial effect in one policy area has a large negative effect in another. Carbon footprinting is used to quantify the impact of some integrated farming practices

Self-Consciousness: a novel story

This document is the result of work probably better suited to a psychologist than a literary scholar, so I make my apologies in advance if what follows seems at times inappropriately confessional, but I'm afraid that my interest in the subject is less academic than it is personal. Though it was never included as part of his academic work, the attached typescript for a graphic novel, Kariba, is the work of James C—, for a time one of my most promising students. Under my supervision for the MA within the Department of Language and Communication, he was engaged in writing a novel (the traditional kind, sans illustrations) of which, tragically, only fragments remain. James took his own life in late 2019 after a long struggle with depression. As his supervisor, I saw first-hand the progress of this terrible disease. Despite the encouragement I gave, James suffered from a lack of self-belief that many will recognise as symptomatic of our age—in which the good lack all conviction, while the worst are full of passionate intensity

Ethics in radiology: A case-based approach

Background: Ethics training is required for all radiology residents in Canada, but this may be difficult to provide as radiology departments may not have radiologists with formal ethics training, and may not have access to educational resources focussed on teaching ethics to radiologists. We describe the implementation of a case-based approach to teaching and learning ethics, designed for Canadian radiologists. This approach can be adapted for use in other specialties through development of specialty-specific ethics case scenarios.Methods: Ethics case study rounds specific to Canadian radiologic practice were presented at two different institutions, and using two different methods within one institution. In one method, we requested that the residents read the case study and questions ahead of time; in the other, the rounds were presented without any expectation of residents doing prior preparation.Results: The participants, as a group, agreed with all seven survey statements describing the value of the experience. The opportunity to read the case ahead of time seemed helpful for some residents, but was not found to be overall more useful than discussing the case without prior review. Indeed, more than half of the resident participants in this group indicated that they did not make use of the advance materials at all.Conclusion: Resident feedback indicates that ethics case study rounds are a useful and valuable experience, especially when the case is specifically tailored to their medical practice. Prior preparation was not necessary for residents to benefit from these rounds

From Ancestral Knowledge to Clinical Practice: The Case of \u3cem\u3eAgonias\u3c/em\u3e and Portuguese Clinicians in America

Cultures have varying notions about symptom expression and the treatment of mental health issues. Consequently, clients and psychotherapists may or may not share a similar worldview. In the psychotherapy literature there has been increased attention to these complex processes. This survey descriptive study aims to understand how therapists working with culturally diverse clients incorporate sensitivity to cultural differences. Fifteen culturally sensitive mental health care providers working with the Portuguese immigrant community were interviewed about their practices. Specifically, we investigated their understanding of the symptoms, causes and cures for agonias, a culture specific phenomenon. It was found that even though the providers are all Portuguese themselves, the meaning that they ascribed to agonias (anxiety and/or depression) was very different than the meaning ascribed to agonias by community members. The community member’s meanings ranged from indigestion to being on the brink of death. A cluster analysis revealed that clinicians who stated that agonias is anxiety, conducted cognitive behavioral therapy or psychopharmacology, and those that stated agonias had a depressive component tended to use family therapy or psychoanalysis

Seamless Online Distribution of Amundsen Multibeam Data

Since 2003, all underway multibeam and sub-bottom data from the Canadian Coast Guard Ship Amundsen has been posted online within approximately six months of the end of each cruise. A custom interface allowing the user to access 15\u27 latitude by 30\u27 longitude mapsheets was implemented in 2006, allowing the user to download the bathymetric and backscatter data at 10 metre resolution. While this interface matched the underlying data management scheme implemented at the University of New Brunswick, the zoom and pan capability was at a fixed scale with limited contextual data. In the past few years, with the introduction of web-based geographic information systems (GIS) (e.g. Google Maps, Yahoo Maps, Bing Maps), there have been thousands of maps published online. These online GIS programs are a suitable platform to display the seven years of Amundsen coverage within the context of the GIS-served satellite imagery and allow the user to freely browse all data in a familiar interface. The challenge, however, for serving up third party data through these map engines is to efficiently cope with the multiple zoom levels and changing resolutions. Custom tiling software was developed to take all the raw data from the seven years of Amundsen (and others\u27) multibeam coverage and convert it into multiple scale resolution images suitable for interpretation by Google Maps. The images were stored in a pyramid structure utilizing Google\u27s map projection and uniquely named to reflect their georeferencing and resolution. This image pyramid is then accessed by Google Maps according to the user\u27s current zoom level to optimize visualization. This multi-resolution data is served up on demand from the University of New Brunswick for dynamic overlay on Google\u27s satellite data. This web interface allows any interested parties to easily view multibeam and sub-bottom data from the Pacific Ocean through the Canadian Arctic Archipelago and into the Atlantic Ocean. The broad overview helps to understand regional trends and then focus on areas of interest at high resolutions to see particular features. The web interface also provides a link to the 15\u27 by 30\u27 mapsheet model with full source traceability

Design and Performance of a Pinned Photodiode CMOS Image Sensor Using Reverse Substrate Bias

A new pinned photodiode (PPD) CMOS image sensor with reverse biased p-type substrate has been developed and characterized. The sensor uses traditional PPDs with one additional deep implantation step to suppress the parasitic reverse currents, and can be fully depleted. The first prototypes have been manufactured on an 18 µm thick, 1000 Ω·cm epitaxial silicon wafers using 180 nm PPD image sensor process. Both front-side illuminated (FSI) and back-side illuminated (BSI) devices were manufactured in collaboration with Teledyne e2v. The characterization results from a number of arrays of 10 µm and 5.4 µm PPD pixels, with different shape, the size and the depth of the new implant are in good agreement with device simulations. The new pixels could be reverse-biased without parasitic leakage currents well beyond full depletion, and demonstrate nearly identical optical response to the reference non-modified pixels. The observed excessive charge sharing in some pixel variants is shown to not be a limiting factor in operation. This development promises to realize monolithic PPD CIS with large depleted thickness and correspondingly high quantum efficiency at near-infrared and soft X-ray wavelengths

Introduction to J. B. Erhard's 'Devil's Apology' (1795)

This is the introduction to “Johann Benjamin Erhard, ‘Devil’s Apology’(1795)”, translated by J. Clarke and C. Rhode, British Journal for the History of Philosophy, DOI: 10.1080/09608788.2018.1441805

Fichte, Hegel, and the Life and Death Struggle

Several commentators have argued that Hegel’s account of ‘self-consciousness’ in Chapter IV of the Phenomenology of Spirit can be read as an ‘immanent critique’ of Fichte’s idealism. If this is correct, it raises the question of whether Hegel’s account of ‘recognition’ in Chapter IV can be interpreted as a critique of Fichte’s conception of recognition as expounded in the Foundations of Natural Right. A satisfactory answer to this question will have to provide a plausible interpretation of the ‘life and death struggle’ as an immanent critique of Fichte’s account of recognition. This paper aims to provide such an interpretation. The first part of the paper provides a discussion of Fichte’s account of recognition that emphasizes its ‘epistemic’ concerns. The second part argues that Hegel’s account of the ‘life and death struggle’ can be read plausibly as a critique of Fichte’s account of recognition

Fully Depleted, Monolithic Pinned Photodiode CMOS Image Sensor Using Reverse Substrate Bias

A new pixel design using pinned photodiode (PPD) in a 180 nm CMOS image sensor (CIS) process has been developed as a proof of principle. The sensor can be fully depleted by means of reverse bias applied to the substrate, and the principle of operation is applicable to very thick sensitive volumes. Additional n-type implants under the in-pixel p-wells have been added to the manufacturing process in order to eliminate the large parasitic substrate current that would otherwise be present in a normal device. The new design exhibits nearly identical electro-optical performance under reverse bias as the reference PPD pixel it is based on, and the leakage current is effectively suppressed. The characterisation results from both front- and back-side illuminated sensor variants show that the epitaxial layer is fully depleted