Nonlocality in Homogeneous Superfluid Turbulence

Simulating superfluid turbulence using the localized induction approximation in periodic bound- aries produces open-orbit vortices, which make superfluid turbulence unsustainable. Calculating with the fully nonlocal Biot-Savart law prevents the open-orbit state from forming, but also in- creases computation time. We use a truncated Biot-Savart integral to investigate the effects of nonlocality on homogeneous turbulence. We find that including the nonlocal interaction up to the average intervortex spacing prevents this open-orbit state from forming, yielding an accurate model of homogeneous superfluid turbulence with less computation time

Dynamics of Affordances and Implications for Design

Affordance is an important concept in HCI. There are various interpretations of affordances but it has been difficult to use this concept for design purposes. Often the treatment of affordances in the current HCI literature has been as a one-to-one relationship between a user and an artefact. According to our views, affordance is a dynamic, always emerging relationship between a human and his environment. We believe that the social and cultural contexts within which an artefact is situated affect the way in which the artefact is used. Using a Structuration Theory approach, we argue that affordances need also be treated at a much broader level, encompassing social and cultural aspects. We suggest that affordances should be seen at three levels: single user, organizational (or work group) and societal. Focusing on the organizational level affordances, we provide details of several important factors that affect the emergence of affordances

Demodulation system Patent

Development of demodulation system for removing amplitude modulation from two quadrature displaced data bearing signal

CMOS Gate Drive IC With Embedded Cross Talk Suppression Circuitry For Power Electronic Applications

Electric Vehicle (EV) propulsion systems are typically driven by three phase-leg motor drives, which consist of a pair of power devices. Each one of these power devices must be driven by a gate driver chip to operate efficiently. The proposed gate driver solution considers driving SiC devices and has been developed to increase the efficiency of such devices, which requires new gate driver solutions that can properly handle the high switching speeds of these devices. The higher switching speeds seen in SiC devices have brought forth a new problem: cross-talk. Cross-talk can be seen in the false switching of the partner device of a phase-leg as the driven device is being switched. Therefore, crosstalk suppression circuitry must be considered when developing a new gate driver solution. The proposed gate driver includes embedded cross talk suppression. The new gate driver topology will be presented and will show the cross talk suppression operation

Configurable Low Power Analog Multilayer Perceptron

A configurable, low power analog implementation of a multilayer perceptron (MLP) is presented in this work. It features a highly programmable system that allows the user to create a MLP neural network design of their choosing. In addition to the configurability, this neural network provides the ability of low power operation via analog circuitry in its neurons. The main MLP system is made up of 12 neurons that can be configurable to any number of layers and neurons per layer until all available resources are utilized. The MLP network is fabricated in a standard 0.13 μm CMOS process occupying approximately 1 mm2 of on-chip area. The MLP system is analyzed at several different configurations with all achieving a greater than 1 Tera-operations per second per Watt figure of merit. This work offers a high speed, low power, and scalable alternative to digital configurable neural networks

The lifeline in narrative exposure therapy: the experience of therapists

Overview Psychological interventions for PTSD and complex PTSD can be effective in reducing distress and improving wellbeing. The majority of the evidence base is quantitative in nature, meaning relatively little is known about clinician and service user views on the benefits and challenges of these interventions. This thesis uses qualitative methods to explore several questions about the experience of trauma-focussed therapies. Part 1 is a thematic synthesis. Twenty-one qualitative studies which explored the service user experience of evidence-based trauma therapies were reviewed and synthesised. The findings suggest that these interventions can be very beneficial, but can also be distressing and difficult. The findings also suggest a range of factors which may support initial and continued engagement with the therapies. Part 2 is a qualitative study exploring the therapist experience of the lifeline component of narrative exposure therapy (NET). In NET, a lifeline is constructed using physical materials to depict the chronology of a person’s life. Sixteen therapists were interviewed about their experience of this component of NET and their responses were analysed using thematic analysis. The findings suggest that the lifeline is a valued part of the therapy, and a range of suggested functions, challenges, and processes therapists felt were associated with the lifeline are detailed. Part 3 of this thesis is a critical appraisal of the process of the research. Through the chronology of the project from proposal to submission, a range of issues are reflected on, including the challenges of conducting research in clinical settings and the experience of adapting to qualitative methodology

The Invincible (1758) site: an integrated geophysical assessment

Chirp sub-bottom profiler and repeat sidescan sonar imaging of the Invincible wreck site (1758) in the Solent (U.K.), interpretation, and implications for management of the site

Why bad ideas are a good idea

What would happen if we wrote an Abstract that was the exact opposite of what the paper described? This is a bad idea, but it makes us think more carefully than usual about properties of Abstracts. This paper describes BadIdeas, a collection of techniques that uses ???bad??? or ???silly??? ideas to inspire creativity, explore design domains and teach critical thinking in interaction design. We describe the approach, some evidence, how it is performed in practice and experience in its use.published or submitted for publicationis peer reviewe

Growth and peroxidase production in cultures of horseradish (Armoraciu mticunu).

Peroxidase, an enzyme of commercial importance to the diagnostic industry, is currently extracted and purified from the roots of field-grown horseradish plants (Armoracia rusticana) by conventional methods. It is, however, known that plant peroxidases occur in undifferentiated cells maintained in culture at a specific and total activity which may surpass that of the root (Shinshi & Noguchi, 1976). In this report we have examined cell cultures of the horseradish plant as a source of the enzyme