463 research outputs found
The poetical works of Thomas Parnell.
No full textEd., with life of the author, by John Mitford.Dedicatory epistle to the Rev. Alexander Dyce [by Rev. John Mitford]--Life of Parnell.--Poems.--The life of Zoilus, and his Remarks on Homer's Battle of the frogs and mice.Mode of access: Internet
The emergence of sustainability culture and the sustainability practitioner
No full textIn this thesis, I propose that sustainability is a new emergent cultural phenomenon – a new “dreaming” - arising from our conscious and unconscious actions, our relationships and our connection to place. Such a culture of sustainability is essential to support the vision of a sustainable global society. I further propose that the way sustainability is practised, both personally and professionally, has significant potential for fostering the emergence of sustainability culture, and that a mature sustainability culture, in turn, will support our myriad actions towards sustainability. The above propositions have a significant caveat: emergence, as understood in complexity theory, is not predictable. The current unsustainable paradigm of global development is also an emergent phenomenon. Real sustainability is therefore not inevitable, simply because a vision has been articulated, and strategies and actions implemented.
I also contend that as sustainability is holistic in conception, it requires a holistic approach to practice, in addition to the mechanistic prescriptions common to much contemporary sustainability practice. To move towards a holistic approach to practice requires a different type of practitioner from the conventional practitioner: more generalist than specialist, drawing on their “inner sustainability culture” when faced with complex sustainability problems, capable of working across scales, open to discovery of new patterns, and mindful of the degree of complexity in any practice setting.
In recognition of the need for a new cultural paradigm of sustainability, and drawing on the concept of emergence as described by complexity theory, I have designed this research project to investigate the following four themes:
1. Culture as an emergent quality of complex adaptive socio-technical systems;
2. The connections between human action and emergent system qualities;
3. The prospects for the emergence of a culture of sustainability; and
4. The implications of emergent sustainability culture for the sustainability practitioner.
In this thesis, I argue that we need a model of sustainability culture that accommodates the emergence phenomenon and new ways of emergence-based sustainability practice. I therefore propose an Emergence Model of Sustainability Culture to illustrate the relationship between sustainability, culture and the emergence phenomenon, and I articulate four Emergence Patterns for Sustainability Practice as a working framework for emergence-oriented sustainability practice across different generic practice settings in simple, complicated, complex and chaotic space. I hope that sustainability practitioners will find my Emergence Model and Emergence Patterns to be helpful in progressing to a more considered and deeper approach to sustainability practice than contemporary approaches, especially where sustainability problems are complex and difficult. In this way we may continue to develop a culture of sustainability as a new “dreaming” and the practice of sustainability will progress further to service humanity’s compelling need
The Parnell movement; with a sketch of Irish parties from 1843, by T. P. O'Connor.
No full textAuthorized ed.2 p. l., 574 p
The distribution of estuarine and oceanic water masses on the southern shore of O'ahu, Hawai'i: Ecological and coastal management implications, and novel methodology
No full textThe view from the backbench : Irish Nationalist MPs and their work, 1910-1914
No full textAvailable from British Library Document Supply Centre- DSC:DXN065144 / BLDSC - British Library Document Supply CentreSIGLEGBUnited Kingdo
(D)urban identity : stories of an African city
No full textIncludes bibliographical references (p. 263-309)
The nature of separator current layers in MHS equilibria I. Current parallel to the separator
No full textJEHS would like to thank STFC for financial support during her Ph.D and CEP acknowledges support from the STFC consolidated grant.Separators, which are in many ways the three-dimensional equivalent to two-dimensional nulls, are important sites for magnetic reconnection. Magnetic reconnection occurs in strong current layers which have very short length scales. The aim of this work is to explore the nature of current layers around separators. A separator is a special field line which lies along the intersection of two separatrix surfaces and forms the boundary between four topologically distinct flux domains. In particular, here the current layer about a separator that joins two 3D nulls and lies along the intersection of their separatrix surfaces is investigated. A magnetic configuration containing a single separator embedded in a uniform plasma with a uniform electric current parallel to the separator is considered. This initial magnetic setup, which is not in equilibrium, relaxes in a non-resistive manner to form an equilibrium. The relaxation is achieved using the 3D MHD code, Lare3d, with resistivity set to zero. A series of experiments with varying initial current are run to investigate the characteristics of the resulting current layers present in the final (quasi-) equilibrium states. In each experiment, the separator collapses and a current layer forms along it. The dimensions and strength of the current layer increase with initial current. It is found that separator current layers formed from current parallel to the separator are twisted. Also the collapse of the separator is a process that evolves like an infinite-time singularity where the length, width and peak current in the layer grow slowly whilst the depth of the current layer decreases.Peer reviewe
Particle acceleration at a reconnecting magnetic separator
No full textWhile the exact acceleration mechanism of energetic particles during solar flares is (as yet) unknown, magnetic reconnection plays a key role both in the release of stored magnetic energy of the solar corona and the magnetic restructuring during a flare. Recent work has shown that special field lines, called separators, are common sites of reconnection in 3D numerical experiments. To date, 3D separator reconnection sites have received little attention as particle accelerators. We investigate the effectiveness of separator reconnection as a particle acceleration mechanism for electrons and protons. We study the particle acceleration using a relativistic guiding-centre particle code in a time-dependent kinematic model of magnetic reconnection at a separator. The effect upon particle behaviour of initial position, pitch angle and initial kinetic energy are examined in detail, both for specific (single) particle examples and for large distributions of initial conditions. The separator reconnection model contains several free parameters and we study the effect of changing these parameters upon particle acceleration, in particular in view of the final particle energy ranges which agree with observed energy spectra.Peer reviewe
The investigation of quasi-separatrix layers in solar magnetic fields
No full textThe structure of the magnetic field is often an important factor in
many energetic processes in the solar corona.
To determine the topology of the magnetic field features such as null
points, separatrix surfaces, and separators must be found.
It has been found that these features may be preferred sites for the formation of current sheets associated with the
accumulation of free magnetic energy.
Over the last decade, it also became clear that the geometrical
analogs of the separatrices, the so-called quasi separatrix
layers, have similar properties.
This thesis has the aim of investigating these properties and to find correlations between these quantities.
Our goal is to determine the relation between the geometrical features associated with the QSLs and with current structures, sites of reconnection and topological features.
With these aims
we conduct three different studies.
First, we investigate a non linear force free magnetic field extrapolation from observed magnetogram data taken during a solar flare eruption concentrating our attention on two snapshots, one before the event and one after.
We determine the QSLs and related structures and by considering carefully how these change between the two snapshots we are able to propose a possible scenario for how the flare occurred.
In our second project we consider potential source distributions. We take different potential point source models: two four sources models already presented in the literature and a random distribution of fifteen sources.
From these potential models we conduct a detailed analysis of the relationship between topological features and QSLs.
It is found that the maxima of the Q-factor in the photosphere are located near and above the position of the subphotospheric null points (extending part way along their spines) and that their narrow QSLs are associated with the curves defined by the photospheric endpoints of all fan field lines that start from subphotospheric sources.
Our last study investigates two different flux rope emergence simulations. In particular, we take one case with and one without an overlying magnetic field.
Here, we can identify the QSLs, current, and sites of reconnection and determine the relation between them.
From this work we found that not all high-Q regions are associated with current and/or reconnection and vice-versa.
We also investigated the geometry of the field lines associated with high-Q regions to determine which geometrical behaviour of the magnetic field they are associated with. Those that are associated with reconnection also coincide with topological features such as separators
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