Solar electron beam transport in the inner heliosphere

Impulsive solar electron beams have an attractive diagnostic potential for poorly understood particle acceleration processes in solar flares. Solar flare accelerated electron beams propagating away from the Sun can interact with the turbulent interplanetary media, producing Langmuir waves and type III radio emission. In this thesis, we simulate electron beam propagation from the Sun to the Earth in the weak turbulent regime taking into account the self-consistent generation of Langmuir waves. We show that an injected single power-law spectrum will be detected at 1 AU as a broken power-law due to wave-particle interaction in the inhomogeneous plasma. We further extend these results by investigating the Langmuir wave interaction with background electron density fluctuations from low frequency MHD turbulence. We find a direct correlation between the spectra of the double power-law below the break energy and the turbulent intensity of the background plasma. Solar flares are believed to accelerate both upward and downward propagating electron beams which can radiate emission at radio and X-ray wavelengths correspondingly. The correlation between X-ray and radio emissions in a well observed solar flare allowed us detailed study of the electron acceleration region properties. We used the Nancay Radioheliograph, Phoenix-2 and RHESSI to infer the type III position, type III starting frequency and spectral index of the HXR emission respectively. Using these datasets and numerical simulations of the electron beam transport in the corona plasma, we were able to infer not only the location (the height in the corona), but to estimate the spatial length of the electron acceleration site

Triggering dialogic activities across networks

Our study originates in exploratory interventions aimed at engaging students with relevant practices to support  learning both in and about digital environments. Our students come from a wide range of professional contexts all over the world. Most are involved in teaching or supporting teaching. What they learn on our programme is carried into their practice - and vice versa. Their introductory course explores a range of environments along with critical literature, with a strong theoretical emphasis. The authors both have an interest in dialogic approaches to education, and we share findings on activities designed and tutored by each of us. A webquest and an online text augmentation exercise were both found to promote student creativity, dialogue and learning.  While we had respectable pedagogical reasons for these activities, our subsequent reflections and conversations about them suggested that they were worthy of further theoretical analysis.  Our students demonstrated considerable use of existing networks while at the same time apparently generating new networks that would sustain them throughout a programme of study and beyond. Drawing on Wegerif's (2013) notion of dialogic and its Bakhtinian influences, we attempt to distinguish and name features of networks likely to trigger dialogic exchanges that foster learning. We have isolated examples from each practice of particularly ‘interanimating' sections of dialogue and created a thick description of them, including their antecedents and consequences. Our examples illustrate that both practices raised questions about purpose, offered opportunities for showcasing knowledge and connections, led to sharing and making practices visible, and were taken forward to new contexts. The findings are not all positive; we have also identified concerns about exclusion or inadequacy from those who feel unable to participate fully, but even then there is potential to turn around difficult situations. This study might have practical application for learning designers but should also be of theoretical interest for research into newer forms of academic literacy

Trends in treated problem drug use in the seven health board areas outside the Eastern Regional Health Authority: 1998 to 2002 / Jean Long, Tracey Kelleher, Fionnola Kelly, Hamish Sinclair

HRB / 200

Trends in treated problem cannabis use in the seven health board areas outside the Eastern Regional Health Authority, 1998 to 2002. Occasional Paper no. 14.

The data presented in this paper describe trends in treated problem cannabis use in seven health board areas, namely: the Midland, Mid-Western, North Eastern, North Western, Southern, South Eastern and Western Health Boards. The total numbers include 6,164 cases who lived and were treated in the seven health boards between 1998 and 2002. In this paper, treated problem cannabis use is described in relation to person, place and time. This paper will assist policy makers and service planners develop appropriate responses to problem cannabis use. The analysis presented in this paper is based on data reported to the National Drug Treatment Reporting System (NDTRS)

Treatment demand in the seven health board areas outside the Eastern Regional Health Authority: 1998 to 2002 / Jean Long, Tracey Kelleher, Fionnola Kelly, Hamish Sinclair

HRB / 200

Trends in treated problem opiate use in the seven health board areas outside the Eastern Regional Health Authority: 1998 to 2002 / Jean Long, Tracey Kelleher, Fionnola Kelly, Hamish Sinclair

HRB / 200

Trends in treated problem cannabis use in the seven health board areas outside the Eastern Regional Health Authority: 1998 to 2002 \\\\ Tracey Kelleher, Jean Long, Fionnola Kelly, and Hamish Sinclair.

HRB / 200

Treatment demand for problem alcohol use in the South Eastern and Southern Health Board areas: 2000 to 2002 / Jean Long, Timothy Jackson, Martina Kidd, Tracey Kelleher, Hamish Sinclair

HRB / 200