8,394 research outputs found

    Exploring the Structure of Scattering Amplitudes in Quantum Field Theory: Scattering Equations, On-Shell Diagrams and Ambitwistor String Models in Gauge Theory and Gravity

    Get PDF
    In this thesis I analyse the structure of scattering amplitudes in super-symmetric gauge and gravitational theories in four dimensional spacetime, starting with a detailed review of background material accessible to a non-expert. I then analyse the 4D scattering equations, developing the theory of how they can be used to express scattering amplitudes at tree level. I go on to explain how the equations can be solved numerically using a Monte Carlo algorithm, and introduce my Mathematica package treeamps4dJAF which performs these calculations. Next I analyse the relation between the 4D scattering equations and on-shell diagrams in N = 4 super Yang-Mills, which provides a new perspective on the tree level amplitudes of the theory. I apply a similar analysis to N = 8 supergravity, developing the theory of on-shell diagrams to derive new Grassmannian integral formulae for the amplitudes of the theory. In both theories I derive a new worldsheet expression for the 4 point one loop amplitude supported on 4D scattering equations. Finally I use 4D ambitwistor string theory to analyse scattering amplitudes in N = 4 conformal supergravity, deriving new worldsheet formulae for both plane wave and non-plane wave amplitudes supported on 4D scattering equations. I introduce a new prescription to calculate the derivatives of on-shell variables with respect to momenta, and I use this to show that certain non-plane wave amplitudes can be calculated as momentum derivatives of amplitudes with plane wave states

    ‘Mental fight’ and ‘seeing & writing’ in Virginia Woolf and William Blake

    Get PDF
    This thesis is the first full-length study to assess the writer and publisher Virginia Woolf’s (1882-1941) responses to the radical Romantic poet-painter, and engraver, William Blake (1757-1827). I trace Woolf’s public and private, overt and subtle references to Blake in fiction, essays, notebooks, diaries, letters and drawings. I have examined volumes in Leonard and Virginia Woolf’s library that are pertinent, directly and indirectly, to Woolf’s understanding of Blake. I focus on Woolf’s key phrases about Blake: ‘Mental fight’, and ‘seeing & writing.’ I consider the other phrases Woolf uses to think about Blake in the context of these two categories. Woolf and Blake are both interested in combining visual and verbal aesthetics (‘seeing & writing’). They are both critical of their respective cultures (‘Mental fight’). Woolf mentions ‘seeing & writing’ in connection to Blake in a 1940 notebook. She engages with Blake’s ‘Mental fight’ in ‘Thoughts on Peace in an Air Raid’ (1940). I map late nineteenth and early twentieth-century opinion on Blake and explore Woolf’s engagement with Blake in these wider contexts. I make use of the circumstantial detail of Woolf’s friendship with the great Blake collector and scholar, Geoffrey Keynes (1887-1982), brother of Bloomsbury economist John Maynard Keynes. Woolf was party to the Blake centenary celebrations courtesy of Geoffrey Keynes’s organisation of the centenary exhibition in London in 1927. Chapter One introduces Woolf’s explicit references to Blake and examines the record of Woolf scholarship that unites Woolf and Blake. To see how her predecessors had responded, Chapter Two examines the nineteenth-century interest in Blake and Woolf’s engagement with key nineteenth-century Blakeans. Chapter Three looks at the modernist, early twentieth-century engagement with Blake, to contextualise Woolf’s position on Blake. Chapter Four assesses how Woolf and Blake use ‘Mental fight’ to oppose warmongering and fascist politics. Chapter Five is about what Woolf and Blake write and think about the country and the city. Chapter Six discusses Woolf’s reading of John Milton (1608-1674) in relation to her interest in Blake, drawing on the evidence of Blake’s intense reading of Milton. Chapter Seven examines further miscellaneous continuities between Woolf and Blake. Chapter Eight proposes, in conclusion, that we can only form an impression of Woolf’s Blake. The thesis also has three appendices. First, a chronology of key publications which chart Blake’s reputation as well as Woolf’s allusions to Blake. Second a list all of Blake’s poetry represented in Woolf’s library including contents page. The third lists all the other volumes in Woolf’s library that proved relevant. Although Woolf’s writing is the subject of this thesis, my project necessitates an attempt to recover how Blake was understood and misunderstood by numerous writers in the early twentieth century. The thesis argues Blake is a model radical Romantic who combines the visual and the verbal and that Woolf sees him as a kindred artist

    Consolidation of Urban Freight Transport – Models and Algorithms

    Get PDF
    Urban freight transport is an indispensable component of economic and social life in cities. Compared to other types of transport, however, it contributes disproportionately to the negative impacts of traffic. As a result, urban freight transport is closely linked to social, environmental, and economic challenges. Managing urban freight transport and addressing these issues poses challenges not only for local city administrations but also for companies, such as logistics service providers (LSPs). Numerous policy measures and company-driven initiatives exist in the area of urban freight transport to overcome these challenges. One central approach is the consolidation of urban freight transport. This dissertation focuses on urban consolidation centers (UCCs) which are a widely studied and applied measure in urban freight transport. The fundamental idea of UCCs is to consolidate freight transport across companies in logistics facilities close to an urban area in order to increase the efficiency of vehicles delivering goods within the urban area. Although the concept has been researched and tested for several decades and it was shown that it can reduce the negative externalities of freight transport in cities, in practice many UCCs struggle with a lack of business participation and financial difficulties. This dissertation is primarily focused on the costs and savings associated with the use of UCCs from the perspective of LSPs. The cost-effectiveness of UCC use, which is also referred to as cost attractiveness, can be seen as a crucial condition for LSPs to be interested in using UCC systems. The overall objective of this dissertation is two-fold. First, it aims to develop models to provide decision support for evaluating the cost-effectiveness of using UCCs. Second, it aims to analyze the impacts of urban freight transport regulations and operational characteristics on the cost attractiveness of using UCCs from the perspective of LSPs. In this context, a distinction is made between UCCs that are jointly operated by a group of LSPs and UCCs that are operated by third parties who offer their urban transport service for a fee. The main body of this dissertation is based on three research papers. The first paper focuses on jointly-operated UCCs that are operated by a group of cooperating LSPs. It presents a simulation model to analyze the financial impacts on LSPs participating in such a scheme. In doing so, a particular focus is placed on urban freight transport regulations. A case study is used to analyze the operation of a jointly-operated UCC for scenarios involving three freight transport regulations. The second and third papers take on a different perspective on UCCs by focusing on third-party operated UCCs. In contrast to the first paper, the second and third papers present an evaluation approach in which the decision to use UCCs is integrated with the vehicle route planning of LSPs. In addition to addressing the basic version of this integrated routing problem, known as the vehicle routing problem with transshipment facilities (VRPTF), the second paper presents problem extensions that incorporate time windows, fleet size and mix decisions, and refined objective functions. To heuristically solve the basic problem and the new problem variants, an adaptive large neighborhood search (ALNS) heuristic with embedded local search heuristic and set partitioning problem (SPP) is presented. Furthermore, various factors influencing the cost attractiveness of UCCs, including time windows and usage fees, are analyzed using a real-world case study. The third paper extends the work of the second paper and incorporates daily and entrance-based city toll schemes and enables multi-trip routing. A mixed-integer linear programming (MILP) formulation of the resulting problem is proposed, as well as an ALNS solution heuristic. Moreover, a real-world case study with three European cities is used to analyze the impact of the two city toll systems in different operational contexts

    Management Matters : Organizational Storytelling within the Anthroposophical Society in Sweden

    Get PDF
    The Anthroposophical Society, founded by the Austrian polymath Rudolf Steiner, came to Sweden in 1913, but for the generation of present-day Swedish Anthroposophists whose voices are heard in this study, the great flowering of the movement occurred in the second half of the twentieth century. The movement had by then expanded into a large milieu with many largely independent enterprises and institutions, from the formal organization itself, to various schools, farms, shops, medical facilities, etc., all based on interpretations of Steiner’s legacy. Since then, many members of the movement feel, there has been a decline. A movement of this size and complexity can be seen as a large organization with a corporate-like structure. Taking its point of departure in ideas from the vast field of organization studies, and specifically in the study of storytelling as part of the creation of a corporate culture where many voices and many perspectives co-exist, this study investigates how Anthroposophists in Sweden, both rank and-file members and some who served in leadership positions, tell the story of the putative Golden Age, decline, and projected future of Anthroposophy in Sweden. Twenty-eight interviews were collected, recurrent themes identified, and the plots of the various individual stories analyzed by means of a version of the actantial model developed by the semioticist Algirdas Greimas. The basic storyline, of which the interviewees’ individual stories constitute variations, is that the Golden Age, when charismatic leaders could draw crowds of enthusiastic young people and a vibrant Anthroposophical milieu was built up, came to an end with the demise of those leaders. The present, i.e., the time at which the interviews were conducted, is narratively framed as a period of sharp decline. The vistas for the future come across in most stories as quite bleak. An actantial analysis reveals that the past, an epoch that is on one hand held up as a shining example is on the other hand also described as a time characterized by innumerable problems and conflicts. Disagreement is rampant regarding the reasons for the current decline, and a vast number of problems are identified in the individual narratives. The future is for some interviewees impossible to speculate about, whereas others have specific suggestions for change. These suggestions, when held up against each other, show that there is no unified vision of what the necessary changes might be or who must bring them about. The interviewees agree that Anthroposophy plays a vital role as a spiritual path. When asked how they would describe Anthroposophy and what it more specifically can offer, answers diverge, but substantive descriptions of core concepts or practices are rarely alluded to. Rather, their explanations of what Anthroposophy is are in almost all cases metaphorical or negative, i.e., they represent Anthroposophy as elusive or undefinable. Interviewees can suggest that the lack of a clear Anthroposophical “brand” is a major reason for its current perceived crisis. An analysis of the ways in which Rudolf Steiner is portrayed in the interview material shows that there are a variety of descriptions of him rather than a unified representation of a charismatic leader that members can rally around. This, the study suggests, is because four different forms of charisma can be distinguished on theoretical grounds, and the particular form that permeates the narratives collected for this study does not readily support the dissemination of a centralized, dominant narrative.Antroposofiska SĂ€llskapet, grundat av österrikaren Rudolf Steiner, kom till Sverige redan i 1913, men för den generation av nutida svenska antroposofer vars röster hörs i denna studie intrĂ€ffade rörelsens stora blomstringstid först under nittonhundratalets andra hĂ€lft. Vid det laget hade rörelsen expanderat och blivit till en omfattande miljö med mĂ„nga stort sett oberoende institutioner och verksamheter, frĂ„n sjĂ€lva det Antroposofiska SĂ€llskapet i strikt mening till olika skolor, lantbruk, butiker, kliniker, osv., som alla byggde pĂ„ tolkningar av arvet efter Steiner. MĂ„nga medlemmar i rörelsen menar att det sedan dess har skett en nedgĂ„ng. En rörelse med den storlek och komplexitet som det rör sig om i det aktuella fallet kan betraktas som en organisation med en företagsliknande struktur. Denna studie tar dĂ€rför sin utgĂ„ngspunkt i ett organisationsteoretiskt perspektiv, i synnerhet i den gren av organisationsteorin som studerar berĂ€ttande som ett led i hur en organisationskultur med mĂ„nga samexisterande röster skapas. I det aktuella fallet handlar det om berĂ€ttelser som antroposofer i Sverige, bĂ„de vanliga medlemmar och personer i ledarstĂ€llning, framför om den blomstringstid de menar rörelsen en gĂ„ng hade, den nedgĂ„ng de sĂ€ger sig uppleva och den framtid de förestĂ€ller sig att antroposofin i Sverige kommer att möta. TjugoĂ„tta intervjuer genomfördes och de berĂ€ttelser som förmedlas i dessa intervjuer analyserades med hjĂ€lp av en variant av den aktantmodell som utvecklats av semiotikern Algirdas Greimas. Den grundlĂ€ggande handling man Ă„terfinner i intervjupersonernas olika berĂ€ttelser Ă€r att blomstringstiden var en guldĂ„lder dĂ„ karismatiska ledare kunde samla stora grupper av entusiastiska ungdomar och en levande antroposofisk miljö byggdes upp, men att denna guldĂ„lder upphörde nĂ€r ledarna gick ur tiden. Nuet, alltsĂ„ den tid dĂ„ intervjuerna genomfördes, beskrivs i berĂ€ttelserna som en tid av förfall. Framtidsutsikterna som mĂ„las upp i de flesta berĂ€ttelser Ă€r dystra. Aktantanalysen visar att berĂ€ttelserna om det förflutna bĂ„de beskriver denna tid i mycket positiva termer och nĂ€mner otaliga problem och konflikter. Nuets pĂ„stĂ„dda förfall Ă„terkommer i de flesta berĂ€ttelser, men Ă„sikterna gĂ„r vitt isĂ€r nĂ€r det gĂ€ller vad nutidens problem Ă€r och vad som orsakat dem. Framtiden beskrivs av vissa intervjupersoner som omöjlig att spekulera nĂ€rmare om, medan andra har specifika förslag till förĂ€ndringar. Sammantaget visar analysen att det saknas en enhetlig förestĂ€llning om vad som behöver göras för att lösa rörelsens problem och vem som ska ta ansvar för dessa förĂ€ndringar. Intervjupersonerna Ă€r eniga om att antroposofin spelar en viktig roll. FrĂ„gan hur de skulle beskriva antroposofin och vad den har att erbjuda besvaras pĂ„ olika sĂ€tt, men sĂ€llan i termer av konkreta beskrivningar av för antroposofin centrala förestĂ€llningar eller praktiker. Tendensen Ă€r snarare att svara i metaforiska eller negativa termer, alltsĂ„ genom att berĂ€tta att de menar att antroposofin inte gĂ„r att definiera. Samtidigt kan intervjupersonerna förklara att bristen pĂ„ en tydlig antroposofisk identitet Ă€r ett huvudskĂ€l till vad de ser som rörelsens nuvarande kris. En analys av de sĂ€tt pĂ„ vilka Rudolf Steiner beskrivs i intervjumaterialet visar att det ocksĂ„ finns en rad divergerande uppfattningar av honom snarare Ă€n en sammanhĂ„llen beskrivning av en karismatisk ledare som medlemmarna kan samlas kring. Studien konkluderar att karisma pĂ„ teoretiska grunder kan delas in i fyra olika typer, och att den specifika form av karisma som intervjuerna Ă„terspeglar inte harmonierar sĂ€rskilt vĂ€l med spridandet av en centralt utformad dominerande berĂ€ttelse

    Songs without borders: complex interpretative song worlds and the audiences that inhabit them

    Get PDF
    The genre of music commonly referred to as art song often elicits emotionally charged responses in accounts of audience experiences. However, scholarship has largely neglected the object of inquiry where these responses and experiences materialise: the live art song event. The principal research task in this study is to investigate audience experience of live art song events in the UK. The audiences and events at the centre of this inquiry coalesce around the work of the art song promoter Oxford Lieder. Using a mixed method approach (questionnaire, diary methods and guided interviews), statistical and thematic analysis, and Interpretative Phenomenological Analysis, is applied to a dataset that utilises 82 individual participants’ experiences of live art song events, including regular attendees and those experiencing live art song for the first time. To frame the findings of this inquiry, this study establishes the concept of complex interpretative song worlds: defined as a collection of interactions that audience members draw upon to construct their experience of live art song events, through a dynamic and multi-faceted interplay with the system of possibilities afforded by live art song environments. In this study, complex interpretative song world theorising takes place across three levels of audiencing: (1) Interactions with the live art song domain (the norms, behaviours, and conventions of live art song environments) are gathered under three themes. Collecting activity sees a desire for participants to scrutinise song objects, embrace familiar artists and repertoire, and adopt a connoisseur-like approach to knowledge acquisition. Connecting activity reveals a prized sense of close psycho-social resonance, which takes place between songs, performers, spaces and everyday experiences. Venerating activity foregrounds a view of songs as inviolable objects, where perceived changes to songs are deemed heretical by some, examined through the (re)introduction of sung English translations into the live art song corpus. (2) Interactions with live art song objects (the lexical and musical features that make up songs) reveal the ways audience members process words and music, and prioritise either, or both features during live art song events. The presentation of these materials in ways that blur senses (sights and sounds), and time (before, during, and after performances), are shown to be as additive to audience member conceptualisations of the nature of lexical-musical relationships as they are disruptive. (3) Interactions with live art song actors (performers, producers, and audiences) reveal processes of role formation at work, where vocal acts, non-vocal acts, and fixed and non-fixed traits complicate the way audience members derive impressions of performers. Art song’s hybridity as a genre, which is not a dramatic form, yet ‘not not’ a dramatic form, reveals the imbricated way audience members construct identities of performers: as professional musicians; as human beings; and as inhabitants of roles defined textually through a song’s poetic content. This interdisciplinary study draws predominantly on three overlapping areas of scholarship, and makes new contributions to knowledge in all three. For musicology, this inquiry develops deeper understandings of live art song objects to complement the hegemony of hermeneutic, musico-analytical and historiographical research that typifies much of the existing art song literature. For audience studies, these findings provide new audiencing insights, by examining an art form not yet analysed by empirical audience research methods, and one that simultaneously combines both words and music as a mode of expression. For translation theory, this inquiry responds to calls within the existing literature for more research to understand the reception of translation in music. This study also generates dividends outside of the academy, providing new insights for performers and promoters of art song to inform approaches to programming, presentation, production, marketing and audience development

    Investigative Methods: An NCRM Innovation Collection

    Get PDF
    This Innovation Collection on investigative methods brings together investigators working in different domains, sectors, and on different topics of interest to help capture the breadth, scope and relevance of investigative practices over 10 substantive chapters. Each of the papers presents a different investigative method or set of methods and, through case studies, attempts to demonstrate their value. All the contributions, in different ways and for different purposes, seek to reconstruct acts, events, practices, biographies and/or milieux, to which the researchers in question lack direct access, but which they want to reconstruct via the traces those phenomena leave behind, traces themselves often produced as part of the phenomena under investigation. These include reports of methods used in investigations on: - The use of force by state actors, including into police violence, military decisions to attack civilians, the provenance of munitions used to attack civilians, and the use and abuse of tear gas; - Networks of far-right discourse, and its links to criminal attacks and state-leveraged misinformation campaigns; - Archives to establish the penal biographies of convicts and the historical practices of democratic petitioning; - Corporate structures and processes that enable tax avoidance and an avoidance of legal responsibilities to workers and the environment. A working principle of the collection is that investigative methods may be considered, alongside creative, qualitative, quantitative, digital, participatory and mixed methods, a distinct yet complementary style of research

    Genetics and genomics of myxomatous mitral valve disease in dogs

    Get PDF
    As a result of its unique evolutionary history, the modern dog (Canis lupus familiaris) has a simplified genetic landscape that makes it a strong model for investigating the genetic basis of breed specific traits and diseases. This thesis applies genomic methodologies to a complex disease, myxomatous mitral valve disease (MMVD), with the primary aim of improving our understanding of its genetic basis. MMVD is an acquired disease of the dog that causes valvular dysfunction and may result in the development of congestive heart failure (CHF). In dogs, MMVD is the most frequent cause of cardiovascular morbidity and mortality, and despite a thorough understanding of the clinical aspects, the genetic mechanisms that drive disease onset and progression are uncertain. Current MMVD research supports a polygenic mode of inheritance and exemplifies the difficulty in identifying disease risk variants in complex traits. In this thesis, genomic workflows are used to investigate MMVD in an Australian population of Cavalier King Charles Spaniels (CKCS), a breed disproportionately affected by the trait. I first assessed the strength of MMVD phenotypes for use in comparative genomic studies. Then, through bioinformatic approaches, I investigated the genetic landscape of the disease in this breed. Using genomic tools developed for the dog and a combined approach of objective phenotyping, I was able to thoroughly explore the genetics and genomics of MMVD in the CKCS using different types of genomic analyses. In doing so, I was able to demonstrate the utility of pedigreed breeds in the investigation of complex traits and the versatility of genomic datasets. Throughout this thesis MMVD associated loci, candidate genes and putative functional variants are reported

    Coding Christianity: Negotiating Religious Dialogue in Online Participatory Spaces

    Get PDF
    This dissertation examines rhetorical conditions and internet-mediated communication strategies that open and close dialogue between individuals with diverse and conflicting worldviews. The author illustrates this tension through sacred-secular interactions in college composition classrooms and online environments, positing that navigating conflict between these discourses—namely those espoused by religiously committed students and public university instructors—often requires stepping outside of adversarial communication frameworks. This project makes a case for models of civic engagement that use more deliberative rhetorical approaches prioritizing empathy over defensiveness and understanding before persuasion. To develop these non-adversarial communication approaches for the composition classroom, the author looks to participatory media for insights and studies the negotiation strategies of Christian and atheist YouTube users who leverage the affordances of the video medium, internet logics, and invitational rhetorical strategies to engage ideological differences in their respective online communities. Through mixed methods research involving in-depth interviews with five YouTube vloggers, netnographic study of over 3,000 videos, and statistical analysis of 76,000+ user comments, Coding Christianity finds that perspective-taking in conflict-ridden environments can happen between netizens when content creators opt out of “flame wars” and, instead, explicitly model critical openness and charitable listening to perceived “others.” The author ultimately suggests that sacred-secular tension in both academic and digital environments be used, not diffused, to negotiate conflicting values and engage in rigorous, civil dialogues

    Masculinities, vulnerability and negotiated identity: Understanding the reporting behaviours of men who experience violence or otherwise harmful behaviour, within a sex work context

    Get PDF
    Context The focus of sex work related discussions most commonly falls on female providers of sexual services, and male purchasers. As a result, the often victim-oriented policy response in England and Wales falls short of truly addressing the needs of men who are involved in the sale of sex, with there being limited support available for them and a systemic approach which does not fully recognise the potential for men to face harm within this context. Methods The aim of this study is to explore experiences of and reactions to violence, and otherwise harmful behaviours, faced by men in the context of their sex working, by understanding the lived realities of a sample of men who engage in this type of work. The study takes a phased approach which combines an initial informative quantitative survey, with three subsequent phases of semi-structured interviews with male sex workers, sex work-focused practitioners and police officers. The method is guided by feminist research principles which suggest that reality is situated within those with lived experience, and also by an element of co-creation which has grounded this study within the perspectives of male sex workers from its conception. Findings The findings of this research suggest that all of the men involved in the study had faced at least one of the violent or otherwise harmful behaviours outlined, though reporting of these behaviours was not at all common. Discussions with the male sex working participants, practitioners and the police highlighted the issues related to the structural influences of authority, such as the police, and the social environment, and the internalisation of these wider factors, which create barriers to reporting for groups such as male sex workers and others who face similar social marginalisation. Conclusions This study challenges existing gendered understandings of violence and otherwise harmful behaviour within a sex work context, by highlighting the harmful experiences of men. By exploring these experiences and the reporting behaviours of those involved, the study also proposes a new framework for understanding barriers to reporting, which suggests that these are formed through the influences of formal and informal measures of social control, and the internalisation of these outside influences by the individual. By better understanding the experiences of men, and the barriers to their reporting, this study attempts to nuance a gendered discussion. Within, I propose that in order to better support male sex workers, responses must begin by appreciating the heterogeneity of those involved in sex work and the influence of their individual circumstances and the social environment on their willingness to seek support
    • 

    corecore