cometadata/datacite-rtg-text-other-reclassification-records huggingface dataset:
Vanishing theorems for the negative K-theory of stacks
Creators: name: Hoyois, Marc
name: Krishna, Amalendu
Publisher: name: arXiv
Year: 2017
Subjects: subject: K-Theory and Homology (math.KT)
subject: Algebraic Geometry (math.AG)
subject: Algebraic Topology (math.AT)
subject: FOS: Mathematics

description: We prove that the homotopy algebraic K-theory of tame quasi-DM stacks satisfies cdh-descent. We apply this descent result to prove that if X is a Noetherian tame quasi-DM stack and i < -dim(X), then K_i(X)[1/n] = 0 (resp. K_i(X, Z/n) = 0) provided that n is nilpotent on X (resp. is invertible on X). Our descent and vanishing results apply more generally to certain Artin stacks whose stabilizers are extensions of finite group schemes by group schemes of multiplicative type.
description: 26 pages; v3: updated numbering to match published version; v2: final version, to appear in Annals of K-Theory
Procedural education for cancer-related pain in pain medicine fellowships: a national program survey
Creators: name: Woodrow, Alex
name: Teramoto, Masaru
name: Christiansen, Sandy
name: Thapliyal, Mrinal
Publisher: name: Oregon Health and Science University
Year: 2023
Subjects: subject: Cancer Pain
subject: Anesthesiology
subject: Quality of Life
subject: Vertebral Body
subject: Surveys and Questionnaires
subject: Fellowships and Scholarships
subject: Clinical and Systems Science
subject: Chronic Pain Fellowship
subject: Surgery
subject: Neoplasms

description: Cancer-related pain is ubiquitous. Targeted procedural interventions may be an important and under-utilized method for improving cancer-related pain and quality of life. The goal of this study was to determine the baseline educational experience and perceived post-graduation comfort of Pain Medicine fellows in performing procedures that can be used for cancer-related pain.
Pseudo-dualizing complexes and pseudo-derived categories
Creators: name: Positselski, Leonid
Publisher: name: arXiv
Year: 2017
Subjects: subject: Category Theory (math.CT)
subject: Commutative Algebra (math.AC)
subject: Rings and Algebras (math.RA)
subject: FOS: Mathematics

description: The definition of a pseudo-dualizing complex is obtained from that of a dualizing complex by dropping the injective dimension condition, while retaining the finite generatedness and homothety isomorphism conditions. In the specific setting of a pair of associative rings, we show that the datum of a pseudo-dualizing complex induces a triangulated equivalence between a pseudo-coderived category and a pseudo-contraderived category. The latter terms mean triangulated categories standing "in between" the conventional derived category and the coderived or the contraderived category. The constructions of these triangulated categories use appropriate versions of the Auslander and Bass classes of modules. The constructions of derived functors providing the triangulated equivalence are based on a generalization of a technique developed in our previous paper arXiv:1503.05523.
description: LaTeX 2e with pb-diagram, xy-pic, and tikz-cd, 60 pages, 14+3 commutative diagrams; v.4: sections 10-12 added, new subsections 0.8 and 0.10 inserted in the Introduction; v.5: subsection 0.2 shortened, basic definitions added in section 1, explanations added in the proof of Theorem 4.2, several references added; v.7: misprints corrected, references updated -- this is intended as the final version
Expanding community art practice: an analysis of new forms of productive site within community art practice
Creators: name: Carter, Kevin
Publisher: name: University of Westminster
Year: 2013

description: This practice-based research is a reflection upon a community art practice mediated via the social use of digital technologies such as social media, Free Libre Open Source Software (FLOSS) and open data. In combining existing community art methods and methodologies, with those taken from the social use of digital technologies, an attempt has been made to expand community art to include these social sites productively within its practice. Over the past 40 years, community-focused art practice has produced a significant and mature body of critique derived from a range of issues such as community, identity, co-option by external agendas as well as the artists role and identity; all of which have sought to question the currency of its practice. Is it possible then that methods and methodologies, suggested by the social use of digital technologies, may in part ameliorate some of these critiques and in the process expand the productive sites offered to community art? As part of this practice based research a community-focused artwork, Landscape-Portrait, was created. This work featured an explicit engagement with these new sites of social interaction. As an exemplar of an expanded community art practice, Landscape-Portrait combined methods and methodologies borrowed from the social use of digital technologies alongside those of critical community art practice, incorporating a network of virtual and non-virtual sites in both its production and dissemination. In accordance with my research methodology the artworks production and its outcomes were recorded and reflected on. The material generated informed my research outcomes. As a result, this research advocates caution in the championing of the sites made use of by Landscape-Portrait. It argues instead that these sites need to be considered against a set of critical questions regarding their operational culture, terminology, privacy, accessibility, ownership, agency and autonomy; all of which problematise their easy inclusion as productive sites within an expanded community art practice. In response this research proposes an understanding of site as derived from a complex network of virtual and non-virtual constituents. From this understanding a set of speculations, qualifications and methods have been produced that attempt to map the means by which an expanded community artwork, one that employs particular methods and methodologies taken from the social use of digital technology and critical community art practice, might be used to interrogate the constitutional structure of a site, as part of its consideration as a productive site within an expanded community focused art work.
Localization of Bott-Chern classes and Hermitian residues
Creators: name: Corrêa, Maurício
name: Suwa, Tatsuo
Publisher: name: arXiv
Year: 2017
Subjects: subject: Complex Variables (math.CV)
subject: Algebraic Geometry (math.AG)
subject: Differential Geometry (math.DG)
subject: FOS: Mathematics
subject: Primary 32A27, 32C35, 32S65, 53C56, Secondary 14C30, 53B35, 53C05, 57R20

description: We develop a theory of Cech-Bott-Chern cohomology and in this context we naturally come up with the relative Bott-Chern cohomology. In fact Bott-Chern cohomology has two relatives and they all arise from a single complex. Thus we study these three cohomologies in a unified way and obtain a long exact sequence involving the three. We then study the localization problem of characteristic classes in the relative Bott-Chern cohomology. For this we define the cup product and integration in our framework and we discuss local and global duality homomorphisms. After reviewing some materials on connections, we give a vanishing theorem relevant to our localization. With these, we prove a residue theorem for a vector bundle admitting a Hermitian connection compatible with an action of the non-singular part of a singular distribution. As a typical case, we discuss the action of a distribution on the normal bundle of an invariant submanifold (so-called the Camacho-Sad action) and give a specific example.
description: 28 pages, to appear in Journal of the London Mathematical Society
(501812) Edward Henry Gates
Creators: name: Professions, Victorian
Publisher: name: University of Oxford
Year: 2022
Subjects: subject: 220201 Business and Labour History
subject: FOS: Philosophy, ethics and religion
subject: History
subject: 140203 Economic History
subject: FOS: Economics and business

description: This three-year research project began in January 2014 and investigated whether, during the Victorian period, the professions formed a distinct self-sustaining social group with its own mores and values. The project looked at 16,000 individuals drawn from census data for Alnwick, Brighton, Bristol, Dundee, Greenock, Leeds, Merthyr Tydfil, Morpeth, and Winchester. The research project was funded by the UK Economic & Social Research Council and was based at the Universities of Oxford and Northumbria.
Asymmetry and non-dispersivity in the Aharonov-Bohm effect
Creators: name: Becker, Maria
name: Guzzinati, Giulio
name: Armand, Béché
name: Verbeeck, Johan
name: Batelaan, Herman
Publisher: name: arXiv
Year: 2017
Subjects: subject: Quantum Physics (quant-ph)
subject: FOS: Physical sciences
subject: 00

description: Decades ago, Aharonov and Bohm showed that electrons are affected by electromagnetic potentials in the absence of forces due to fields. Zeilinger's theorem describes this absence of classical force in quantum terms as the "dispersionless" nature of the Aharonov-Bohm effect. Shelankov predicted the presence of a quantum "force" for the same Aharonov-Bohm physical system as elucidated by Berry. Here, we report an experiment designed to test Shelankov's prediction and we provide a theoretical analysis that is intended to elucidate the relation between Shelankov's prediction and Zeilinger's theorem. The experiment consists of the Aharonov--Bohm physical system; free electrons pass a magnetized nanorod and far--field electron diffraction is observed. The diffraction pattern is asymmetric confirming one of Shelankov's predictions and giving indirect experimental evidence for the presence of a quantum "force". Our theoretical analysis shows that Zeilinger's theorem and Shelankov's result are both special cases of one theorem.
description: 16 pages, 5 figures
British science fiction and the Cold War, 1945-1969
Creators: name: Daley, Christopher
Publisher: name: University of Westminster
Year: 2013

description: This thesis examines British Science Fiction between 1945 and 1969 and considers its response to the Cold War. It investigates the generic progression of British SF in the post-war years, assessing the legacy of the pre-war style of scientific romance in selected works from the late 1940s, before exploring its re-engagement with the tradition of disaster fiction in works by John Wyndham and John Christopher in the 1950s. The thesis then moves on to contemplate the writings of the British New Wave and the experimentations with form in the fiction of J.G. Ballard and Brian Aldiss as well as the stories and articles incorporated within New Worlds magazine during Michael Moorcock’s period as editor. Following on from this is a consideration of the emergence of SF film and television in Britain, marking out its convergence with literary works as well as its own distinctive reactions to the changing contexts of the Cold War. This thesis therefore diverges from existing literary histories of post-war British writing, which have largely focused on the numerous crises affecting the literary novel. Such examinations have tended to represent the Cold War as an ancillary theme – despite Britain being the third nation to acquire nuclear weapons – and have generally overlooked Science Fiction as a suitable mode for engaging with the major transformations taking place in post-war British society. Reacting to such assumptions, this thesis argues that British SF was not only a form that responded to the vast technological changes facilitated by the Cold War, but equally, that cultural life during the Cold War presented considerable challenges to Science Fiction itself – with visions of nuclear war and authoritarianism no longer the exclusive property of the speculative imagination but part of everyday life. Additionally, by concentrating on overtly British responses to the Cold War this thesis aims to further illuminate an area of cultural history that has otherwise received limited attention.
Greed Works -- Online Algorithms For Unrelated Machine Stochastic Scheduling
Creators: name: Gupta, Varun
name: Moseley, Benjamin
name: Uetz, Marc
name: Xie, Qiaomin
Publisher: name: arXiv
Year: 2017
Subjects: subject: Data Structures and Algorithms (cs.DS)
subject: FOS: Computer and information sciences
subject: F.2.2
subject: 90B36

description: This paper establishes performance guarantees for online algorithms that schedule stochastic, nonpreemptive jobs on unrelated machines to minimize the expected total weighted completion time. Prior work on unrelated machine scheduling with stochastic jobs was restricted to the offline case, and required linear or convex programming relaxations for the assignment of jobs to machines. The algorithms introduced in this paper are purely combinatorial. The performance bounds are of the same order of magnitude as those of earlier work, and depend linearly on an upper bound on the squared coefficient of variation of the jobs' processing times. Specifically for deterministic processing times, without and with release times, the competitive ratios are 4 and 7.216, respectively. As to the technical contribution, the paper shows how dual fitting techniques can be used for stochastic and nonpreemptive scheduling problems.
description: Preliminary version appeared in IPCO 2017
A control theorem for $p$-adic automorphic forms and Teitelbaum's $\mathcal{L}$-invariant
Creators: name: Graef, Peter Mathias
Publisher: name: arXiv
Year: 2017
Subjects: subject: Number Theory (math.NT)
subject: FOS: Mathematics

description: In this article, we describe an efficient method for computing Teitelbaum's $p$-adic $\mathcal{L}$-invariant. These invariants are realized as the eigenvalues of the $\mathcal{L}$-operator acting on a space of harmonic cocycles on the Bruhat-Tits tree $\mathcal{T}$, which is computable by the methods of Franc and Masdeu described in [FM14]. The main difficulty in computing the $\mathcal{L}$-operator is the efficient computation of the $p$-adic Coleman integrals in its definition. To solve this problem, we use overconvergent methods, first developed by Darmon, Greenberg, Pollack and Stevens. In order to make these methods applicable to our setting, we prove a control theorem for $p$-adic automorphic forms of arbitrary even weight. Moreover, we give computational evidence for relations between slopes of $\mathcal{L}$-invariants of different levels and weights for $p=2$.
description: pre-print of an article published in the Ramanujan Journal, final authenticated version available at: http://dx.doi.org/10.1007/s11139-019-00160-1
Forced flow of granular media: Breakdown of the Beverloo scaling
Creators: name: Madrid, Marcos A.
name: Darias, J. R.
name: Pugnaloni, Luis A.
Publisher: name: arXiv
Year: 2017
Subjects: subject: Soft Condensed Matter (cond-mat.soft)
subject: FOS: Physical sciences

description: The Beverloo scaling for the gravity flow of granular materials through orifices has two distinct universal features. On the one hand, the flow rate is independent of the height of the granular column. On the other hand, less well-known yet more striking, the flow rate is fairly insensitive to the material properties of the grains (density, Young's modulus, friction coefficient, etc.). We show that both universal features are lost if work is done on the system at a high rate. In contrast to viscous fluids, the flow rate increases during discharge if a constant pressure is applied to the free surface of a granular column. Moreover, the flow rate becomes sensitive to the material properties. Nevertheless, a new universal feature emerges: the dissipated power scaled by the mean pressure and the flow rate follows a master curve for forced and unforced conditions and for all material properties studied. We show that this feature can be explained if the granular flow in the silo is assumed to be a quasistatic shear flow under the $μ(I)$-rheology.
description: 6 pages, 4 figures
(501811) Edwin Staines
Creators: name: Professions, Victorian
Publisher: name: University of Oxford
Year: 2022
Subjects: subject: 220201 Business and Labour History
subject: FOS: Philosophy, ethics and religion
subject: History
subject: 140203 Economic History
subject: FOS: Economics and business

description: This three-year research project began in January 2014 and investigated whether, during the Victorian period, the professions formed a distinct self-sustaining social group with its own mores and values. The project looked at 16,000 individuals drawn from census data for Alnwick, Brighton, Bristol, Dundee, Greenock, Leeds, Merthyr Tydfil, Morpeth, and Winchester. The research project was funded by the UK Economic & Social Research Council and was based at the Universities of Oxford and Northumbria.
Discontinuous Hamiltonian Monte Carlo for discrete parameters and discontinuous likelihoods
Creators: name: Nishimura, Akihiko
name: Dunson, David
name: Lu, Jianfeng
Publisher: name: arXiv
Year: 2017
Subjects: subject: Computation (stat.CO)
subject: FOS: Computer and information sciences

description: Hamiltonian Monte Carlo has emerged as a standard tool for posterior computation. In this article, we present an extension that can efficiently explore target distributions with discontinuous densities. Our extension in particular enables efficient sampling from ordinal parameters though embedding of probability mass functions into continuous spaces. We motivate our approach through a theory of discontinuous Hamiltonian dynamics and develop a corresponding numerical solver. The proposed solver is the first of its kind, with a remarkable ability to exactly preserve the Hamiltonian. We apply our algorithm to challenging posterior inference problems to demonstrate its wide applicability and competitive performance.
description: 15 pages (4 figures) + 18 page (3 figures) supplement. Accepted by Biometrika. Code available at https://github.com/aki-nishimura/discontinuous-hmc
“Out and proud…. in all your shaking glory” the wellbeing impact of a dance program with public dance performance for people with Parkinson’s disease: a qualitative study
Creators: name: Carroll, Suzanne J.
name: Dale, Michael J.
name: Bail, Kasia
Publisher: name: Taylor & Francis
Year: 2023
Subjects: subject: Medicine
subject: Neuroscience
subject: Biotechnology
subject: Ecology
subject: FOS: Biological sciences
subject: Sociology
subject: FOS: Sociology
subject: Biological Sciences not elsewhere classified
subject: Science Policy
subject: Mental Health

description: To explore if and how Parkinson’s disease dance class participation and public performance contributes to perceptions of wellbeing. A qualitative design using audio-recorded one-on-one semi-structured interviews with five class participants and three teachers/volunteers from two metropolitan Dance for Wellbeing class locations. Data were inductively thematically analysed by three researchers. Five themes illustrated the experience of dance class and performance for people with Parkinson’s Disease: 1) ‘the enabling learning environment’; 2) ‘physical benefits from class participation; 3) ‘mental/psychological benefits from class participation’; 4) ‘social benefits from class participation; 5) ‘sense of self and life engagement from class participation’. Themes 4 and 5 in particular were considered to be ‘magnified by public performance’, providing an opportunity for solidarity within the group and a supportive avenue for “coming out” and living publicly with the PD diagnosis. Dance performance magnifies health and wellbeing experiences of people with Parkinson’s disease when part of an enabling, inclusive and emotionally and physically safe learning dance class environment. Elements of holistic benefits, as well as the fun and playful nature of the experience may be important elements to consider for motivation, recruitment and retention in this population.IMPLICATIONS FOR REHABILITATIONRehabilitation professionals should consider the use of dance class as an art-based activity that has a holistic therapeutic benefit.Flexible and fun environments are constructive for dancers to sustain attendance and interest.Rehabilitation professionals can be cognisant of the impact of public dance performance as ‘coming out’ with Parkinson’s Disease. Rehabilitation professionals should consider the use of dance class as an art-based activity that has a holistic therapeutic benefit. Flexible and fun environments are constructive for dancers to sustain attendance and interest. Rehabilitation professionals can be cognisant of the impact of public dance performance as ‘coming out’ with Parkinson’s Disease.
Complete metric approximation property for $q$-Araki-Woods algebras
Creators: name: Avsec, Stephen
name: Brannan, Michael
name: Wasilewski, Mateusz
Publisher: name: arXiv
Year: 2017
Subjects: subject: Operator Algebras (math.OA)
subject: Functional Analysis (math.FA)
subject: FOS: Mathematics
subject: 46L10

description: By adapting an ultraproduct technique of Junge and Zeng, we prove that radial completely bounded multipliers on $q$-Gaussian algebras transfer to $q$-Araki-Woods algebras. As a consequence, we establish the $w^{\ast}$-complete metric approximation property for all $q$-Araki-Woods algebras. We apply the latter result to show that the canonical ultraweakly dense C$^\ast$-subalgebras of $q$-Araki-Woods algebras are always QWEP.
description: 24 pages
(501810) William Henry Barnfather
Creators: name: Professions, Victorian
Publisher: name: University of Oxford
Year: 2022
Subjects: subject: 220201 Business and Labour History
subject: FOS: Philosophy, ethics and religion
subject: History
subject: 140203 Economic History
subject: FOS: Economics and business

description: This three-year research project began in January 2014 and investigated whether, during the Victorian period, the professions formed a distinct self-sustaining social group with its own mores and values. The project looked at 16,000 individuals drawn from census data for Alnwick, Brighton, Bristol, Dundee, Greenock, Leeds, Merthyr Tydfil, Morpeth, and Winchester. The research project was funded by the UK Economic & Social Research Council and was based at the Universities of Oxford and Northumbria.
An Active-Set Algorithmic Framework for Non-Convex Optimization Problems over the Simplex
Creators: name: Cristofari, Andrea
name: De Santis, Marianna
name: Lucidi, Stefano
name: Rinaldi, Francesco
Publisher: name: arXiv
Year: 2017
Subjects: subject: Optimization and Control (math.OC)
subject: FOS: Mathematics
subject: 65K05, 90C06, 90C30

description: In this paper, we describe a new active-set algorithmic framework for minimizing a non-convex function over the unit simplex. At each iteration, the method makes use of a rule for identifying active variables (i.e., variables that are zero at a stationary point) and specific directions (that we name active-set gradient related directions) satisfying a new "nonorthogonality" type of condition. We prove global convergence to stationary points when using an Armijo line search in the given framework. We further describe three different examples of active-set gradient related directions that guarantee linear convergence rate (under suitable assumptions). Finally, we report numerical experiments showing the effectiveness of the approach.
description: 29 pages, 3 figures
“Out and proud…. in all your shaking glory” the wellbeing impact of a dance program with public dance performance for people with Parkinson’s disease: a qualitative study
Creators: name: Carroll, Suzanne J.
name: Dale, Michael J.
name: Bail, Kasia
Publisher: name: Taylor & Francis
Year: 2022
Subjects: subject: Medicine
subject: Neuroscience
subject: Biotechnology
subject: Ecology
subject: FOS: Biological sciences
subject: Sociology
subject: FOS: Sociology
subject: Biological Sciences not elsewhere classified
subject: Science Policy
subject: Mental Health

description: To explore if and how Parkinson’s disease dance class participation and public performance contributes to perceptions of wellbeing. A qualitative design using audio-recorded one-on-one semi-structured interviews with five class participants and three teachers/volunteers from two metropolitan Dance for Wellbeing class locations. Data were inductively thematically analysed by three researchers. Five themes illustrated the experience of dance class and performance for people with Parkinson’s Disease: 1) ‘the enabling learning environment’; 2) ‘physical benefits from class participation; 3) ‘mental/psychological benefits from class participation’; 4) ‘social benefits from class participation; 5) ‘sense of self and life engagement from class participation’. Themes 4 and 5 in particular were considered to be ‘magnified by public performance’, providing an opportunity for solidarity within the group and a supportive avenue for “coming out” and living publicly with the PD diagnosis. Dance performance magnifies health and wellbeing experiences of people with Parkinson’s disease when part of an enabling, inclusive and emotionally and physically safe learning dance class environment. Elements of holistic benefits, as well as the fun and playful nature of the experience may be important elements to consider for motivation, recruitment and retention in this population.IMPLICATIONS FOR REHABILITATIONRehabilitation professionals should consider the use of dance class as an art-based activity that has a holistic therapeutic benefit.Flexible and fun environments are constructive for dancers to sustain attendance and interest.Rehabilitation professionals can be cognisant of the impact of public dance performance as ‘coming out’ with Parkinson’s Disease. Rehabilitation professionals should consider the use of dance class as an art-based activity that has a holistic therapeutic benefit. Flexible and fun environments are constructive for dancers to sustain attendance and interest. Rehabilitation professionals can be cognisant of the impact of public dance performance as ‘coming out’ with Parkinson’s Disease.
Putting it together: examining new media arts and creative practice
Creators: name: Ride, Peter
Publisher: name: University of Westminster
Year: 2012

description: This Ph.D. by Published Work examines projects that have taken place over a period of ten years and that address new media practice. The projects include new media arts exhibitions and publications. The argument of the Exegesis is that taken together these works demonstrate how curatorial practice operates in an integrated way between practice and theory and that it is possible to trace how insights about new media are generated, evolve and contribute to discourse in different parts of the arts sector. The Exegesis argues that curatorial practice can be understood as demonstrating reflection­‐in-­action and reflection-­on-­action. It presents a framework for understanding how knowledge is developed through curatorial projects, and thus constitutes practice-­based research. In particular the research addresses the role of the curator in new media arts: how the audience for new media is understood, how practitioners’ knowledge, skills and expertise can be articulated and how cultural concepts around digital technology such as ‘newness’ and ‘innovation’ affect the way that new media practice is understood and experienced. The study examines the curated three exhibitions: Lyndal Jones, Demonstrations and Details from the Facts of Life (2001); Timeless: Time, Landscape and New Media (2006) and David Rokeby: Silicon Remembers Carbon(2007)/ David Rokeby: Plotting Against Time (2008); a co-authored book The New Media Handbook (2006); and three articles and chapters, ‘Enter the Gallery’ (2011) & ‘The Narrative of Technology’ (2012) and ‘Shiny and New’ (2010)
The metamorphosis of authority: a case study of the Aga Khan Development Network and the Ismaili Imamate
Creators: name: Poor, Daryoush
Publisher: name: University of Westminster
Year: 2012

description: This research is a study of modern developments of the institutions of the Nizārī Ismaili imamate during the time of the present Ismaili Imam, Shāh Karīm al-Ḥusaynī, Aga Khan IV, as the 49th hereditary living Imam of Shiʿi Nizārī Ismaili Muslims, particularly addressing the formation of the Aga Khan Development Network (AKDN) and the functions of the Community institutions. Using the case study of the Aga Khan Development Network and the Nizārī Ismaili imamate, this research demonstrates that the three ideal types of authority as proposed by Weber, namely the traditional, charismatic and legal-bureaucratic types, are not sufficient to explain the dynamics of authority among Muslims. This is partly due to Weber’s belief in the uniqueness of Western civilisation, which is a product of his thesis on Protestant Ethics and partly because his ideal typical system does not work in the case of the Muslim societies. The Ismaili imamate with its multifarious institutions in contemporary times is the most suitable counter-example by which to powerfully demonstrate that Weberian models of authority fail to explain this phenomenon and it would indeed appear as a paradoxical institution if viewed with Weberian theses. The Ismaili imamate in contemporary times represents a paradigm shift and a transmutation not only as regards the Weberian models but also when viewed from inside the tradition of Shiʿi Muslim history. This evolutionary leap forward, which has been crystallised over the course of the past half a century, in the Ismaili imamate suggests the development of a new form of authority which is unprecedented. There are clearly various elements in this form of authority which could be discerned as rooted in tradition and history; however the distinctive elements of this new form of authority give it a defining and exciting dimension. There are several qualities which are peculiar to the contemporary condition of the Ismaili imamate and its style of leadership which are distinctive. Most importantly, while some central features, like succession by way of designation (naṣṣ) has not changed, there is one overarching quality which can best capture all these elements and that is the transmutation of the Ismaili imamate from the person of the Imam into the office of imamate and thus we are now facing the institutionalisation of the imamate and the office being the embodiment of the authority of the Imam. I have described this new development as a metamorphosis of the authority because it gives an entirely new form and content to the previously familiar concept of authority in the Shiʿi Ismaili Muslim tradition.
(501809) Mary Anne [Maryanne] Saunders
Creators: name: Professions, Victorian
Publisher: name: University of Oxford
Year: 2022
Subjects: subject: 220201 Business and Labour History
subject: FOS: Philosophy, ethics and religion
subject: History
subject: 140203 Economic History
subject: FOS: Economics and business

description: This three-year research project began in January 2014 and investigated whether, during the Victorian period, the professions formed a distinct self-sustaining social group with its own mores and values. The project looked at 16,000 individuals drawn from census data for Alnwick, Brighton, Bristol, Dundee, Greenock, Leeds, Merthyr Tydfil, Morpeth, and Winchester. The research project was funded by the UK Economic & Social Research Council and was based at the Universities of Oxford and Northumbria.
Tensor tomography on Cartan-Hadamard manifolds
Creators: name: Lehtonen, Jere
name: Railo, Jesse
name: Salo, Mikko
Publisher: name: arXiv
Year: 2017
Subjects: subject: Differential Geometry (math.DG)
subject: FOS: Mathematics
subject: 44A12, 53C21, 53C22, 45Q05

description: We study the geodesic X-ray transform on Cartan-Hadamard manifolds, and prove solenoidal injectivity of this transform acting on functions and tensor fields of any order. The functions are assumed to be exponentially decaying if the sectional curvature is bounded, and polynomially decaying if the sectional curvature decays at infinity. This work extends the results of Lehtonen (2016) to dimensions $n \geq 3$ and to the case of tensor fields of any order.
description: 23 pages; accepted manuscript; new section 1.1 and references, theorems 1.1 and 1.2 now more precise
A Multiscale Study of Film Thickness Dependent Femtosecond Laser Spallation and Ablation
Creators: name: Ji, Pengfei
name: Zhang, Yuwen
Publisher: name: arXiv
Year: 2017
Subjects: subject: Materials Science (cond-mat.mtrl-sci)
subject: FOS: Physical sciences

description: A multiscale studying integrating ab initio quantum mechanics, classical molecular dynamics and two-temperature model, is carried out to study film thickness dependent femtosecond laser spallation and ablation. As an interval of 130.73 nm, five silver films with increasing thickness from 392.19 nm to 915.11 nm are simulated. Absorbed laser fluences of 0.1 J/cm^2 and 0.3 J/cm^2 are chosen to observe the laser spallation and ablation. The simulation results show that film thickness has a close correlation with the Kelvin degree of heating of the laser-irradiated silver films, which further affects femtosecond laser spallation and ablation. Suggestions for precise micromachining are proposed in this paper.
Quantum Black Holes and Atomic Nuclei are Hollow
Creators: name: Tsekov, Roumen
Publisher: name: arXiv
Year: 2017
Subjects: subject: General Physics (physics.gen-ph)
subject: FOS: Physical sciences

description: The quantum Schrodinger-Newton equation is solved for a self-gravitating Bose gas at zero temperature. It is derived that the density is non-uniform and a central hollow cavity exists. The radial distribution of the particle momentum is uniform. It is shown that a quantum black hole can be formed only above a certain critical mass. The temperature effect is accounted for via the Schrodinger-Poisson-Boltzmann equation, where low and high temperature solutions are obtained. The theoretical analysis is extended to a strong interacting gas via the Schrodinger-Yukawa equation, showing that the atomic nuclei are also hollow. Hollow self-gravitating Fermi gases are described by the Thomas-Fermi equation.
description: The paper is dedicated to the Memory of David Bohm (1917-1992) and Stephen Hawking (1942-2018)
The limits of contestation: towards a radical democratic theory of emergency politics
Creators: name: Neve, Richard
Publisher: name: University of Westminster
Year: 2012

description: The claim that the exception has become the norm dominates the discourse of emergency politics. Theories of emergency politics need not rely on norm/exception binary because it closes down possibilities for radical democratic political contestation. Attempts to define a situation as exceptional by powerful political elites are a claim that politics must be foreclosed until they decide that the exigency has been resolved and a ‘normal’ state of affairs has resumed. A theory which conceptualizes space for radical democratic contestation is essential because such contestation is crucial to preserving and enhancing liberal-democratic governance despite claims that they are facing an existential threat. This thesis lays the foundation for such a theory. First, it presents a criticism of the reliance of the norm/exception binary in the discourses of emergency politics. I argue that ‘normal’ and ‘exceptional’ are polemical concepts used to in the defense of particular articulations of hegemonic and political power not liberal-democracy as such. Second, I develop a radical democratic theory of emergency politics. This theory is based on an account of political contingency which conceives of the political realm as being unstable and continually evolving. Thus liberal-democratic regimes never exist in ‘normal’ states because they are constantly engaging with exigencies which that emanate from the political realm. Furthermore, this thesis contends that emergency politics should be inscribed within wider hegemonic practices. What I identify as a paradox of contestation at the heart of liberal-democratic regimes is the terrain on which emergency politics are contested. Liberal-democratic regimes can absorb situations sometimes defined as emergencies. The goal of this thesis is to demonstrate theoretically how liberal-democratic regimes can preserve the possibility of radical democratic politics in the face of claims on the part of powerful political elites that an emergency or exception exists, which must be met with unrestrained violence and by severely reducing the scope of legitimate political contestation.
(501808) Mary [Hedley]
Creators: name: Professions, Victorian
Publisher: name: University of Oxford
Year: 2022
Subjects: subject: 220201 Business and Labour History
subject: FOS: Philosophy, ethics and religion
subject: History
subject: 140203 Economic History
subject: FOS: Economics and business

description: This three-year research project began in January 2014 and investigated whether, during the Victorian period, the professions formed a distinct self-sustaining social group with its own mores and values. The project looked at 16,000 individuals drawn from census data for Alnwick, Brighton, Bristol, Dundee, Greenock, Leeds, Merthyr Tydfil, Morpeth, and Winchester. The research project was funded by the UK Economic & Social Research Council and was based at the Universities of Oxford and Northumbria.
Resonances for obstacles in hyperbolic space
Creators: name: Hintz, Peter
name: Zworski, Maciej
Publisher: name: arXiv
Year: 2017
Subjects: subject: Spectral Theory (math.SP)
subject: Mathematical Physics (math-ph)
subject: Analysis of PDEs (math.AP)
subject: FOS: Mathematics
subject: FOS: Physical sciences

description: We consider scattering by star-shaped obstacles in hyperbolic space and show that resonances satisfy a universal bound $\mathrm{Im}\,λ\leq -\frac{1}{2}$ which is optimal in dimension $2$. In odd dimensions we also show that $\mathrm{Im}\,λ\leq -\fracμρ$ for a universal constant $μ$, where $ρ$ is the radius of a ball containing the obstacle; this gives an improvement for small obstacles. In dimensions $3$ and higher the proofs follow the classical vector field approach of Morawetz, while in dimension $2$ we obtain our bound by working with spaces coming from general relativity. We also show that in odd dimensions resonances of small obstacles are close, in a suitable sense, to Euclidean resonances.
description: 37 pages, 10 figures. v2: added dedication to C. S. Morawetz, fixed typos. v3: published version, added section 6.3
Transforming identities in Europe: Bulgaria and Macedonia between nationalism and Europeanization
Creators: name: Nancheva, Nevena
Publisher: name: University of Westminster
Year: 2012

description: This dissertation offers an investigation of the discursive function of national identity in the project of European integration. Its focus is the discursive dynamics created in the context of European Union Enlargement to the former communist states, and its geographical locus is the Balkan region. Exploring the transformations of national identity narratives in two Balkan states – Bulgaria and Macedonia – the analysis aims to uncover the discursive mechanisms of accommodating national identity in the process of empowering Europeanization. In the theoretical and meta-theoretical frame of poststructuralist discourse theory and within the structure of a small-number comparative case study, the investigation selects six narrative groups. They are centred around key elements in the narration of national identity: nationhood, territory, purpose, statehood, language, minorities. Traditionally interpreted within the hegemony of nationalism, these elements are identifiable in the national identity constructs of both of the studied states. Using qualitative methodology based on discourse analysis, the empirical study traces variations in these narratives in the course of the democratic transition and the preparation for EU membership at the macro level – the state. The purpose of the investigation is to reveal the logic of reading national identity within the empowering discourse of Europeanization. The findings demonstrate that the discursive space of the European project upholds a positive, emancipatory, optimistic vision of national subjectivity. Marginalizing antagonistic interpretations of national identity narrated in the discourse of nationalism, Europeanization reveals the potential to significantly increase the credibility of national identity as a source of collective self-iden tification at the level of the state. This can stabilize the discursive space of European integration and ensure the political relevance of the European project. Where nationalist readings of identity succeed in challenging the hegemony of Europeanization, national identity appears more antagonistic and less compatible with the progress of integration in Europe. In this sense reading national identity emerges as the touchstone of the integration project.
Periods of linear algebraic cycles
Creators: name: Movasati, Hossein
name: Loyola, Roberto Villaflor
Publisher: name: arXiv
Year: 2017
Subjects: subject: Algebraic Geometry (math.AG)
subject: Algebraic Topology (math.AT)
subject: Complex Variables (math.CV)
subject: FOS: Mathematics

description: In this article we use a theorem of Carlson and Griffiths and compute periods of linear algebraic cycles inside the Fermat variety of even dimension $n$ and degree $d$. As an application, for examples of $n$ and $d$ we prove that the locus of hypersurfaces containing two linear cycles whose intersection is of low dimension, is a reduced component of the Hodge locus in the underlying parameter space. We also check the same statement for hypersurfaces containing a complete intersection algebraic cycle. Our result confirms the Hodge conjecture for Hodge cycles obtained by the monodromy of the homology class of such algebraic cycles. This is known as the variational Hodge conjecture.
description: 10 pages
title: Using Machine Learning Techniques to Detect, Classify and Separate Strong Gravitational Lensing Systems from Astronomical Images
Creators: name: Davies, Andrew
Publisher: name: The Open University
Year: 2022

description: This thesis introduces novel methods to detect or discover strong gravitational lenses in future large surveys, with a particular focus on machine learning techniques. Strong Gravitational lenses are rare objects and difficult to recognise, with only a few thou- sand being detected and confirmed. Purpose built machine learning architectures have already been shown to produce state-of-the-art results for a diverse set of problems, including successes in astronomy. For certain simple to define tasks, computational methods are able to learn patterns and features to improve their ability to perform such tasks. A Convolutional Neural Network (CNN) that can be used to identify images con- taining lensing systems has been developed with the aim to achieve the accuracy and speed required to detect gravitational lenses in images. CNNs have already been used in astronomy for star-galaxy classification. The CNN in this thesis has been trained and tested on Euclid-like and KiDS-like simulations from the Euclid Strong Lensing Group, successfully classifying 77% of lenses, with an area under the Receiver Operating Char- acteristic (ROC) curve of up to 0.96. The CNN also classifies lenses in COSMOS HST F814W-band images. After convolution to the Euclid resolution, the CNN can recover most systems that are identifiable by eye. Computational methods are only a feasible solution if they are sufficiently reliable and accurate. A Zooniverse project, Euclid - Challenge the machines, was set up to determine the relative strengths of using Convo- lutional Neural Networks and human volunteers at classifying images, and to determine whether or not computational methods could be used to find strong lensing candidates. This work showed that human volunteers using visual inspection are less successful at classifying images containing strong gravitational lenses than a trained CNN. How- ever by having multiple classifications for each image, human inspection can produce a much more precise (or purer) sample of lenses than the trained CNNs. A method for deblending multiple objects in images using their relative flux ratios and then using Gaussian Mixture Models to classify as distinct objects has been developed with a view to future improvements on lens detection and characterisation. This method can be used to separate multiple objects in an image, and has been shown to pick out new objects where labels are missing or to classify previously distinct objects as a single object in the Abell 2744 catalogue.
title: 323. PTB-Seminar
title: Aktuelle Fortschritte von Kalibrierverfahren im Nieder- und Hochfrequenzbereich 2023
titleType: Subtitle
Creators: name: Meyne, Nora
name: Salloom, Bashar
name: Timmermann, Dion
name: Kuhlmann, Karsten
name: Gellersen, Frauke
name: Tschauder, Meike
name: Wissel, Arne
name: Meisner, Johann
name: Passon, Stephan
name: Dubowik, Alexander
name: Funck, Torsten
name: Entsfellner, Christian
name: Christian, Benjamin
name: Heuermann, Holger
name: Rösel, Gerhard
name: Schröder, Marc Gunnar
Publisher: name: Physikalisch-Technische Bundesanstalt (PTB)
Year: 2023
Subjects: Wellenformmetrologie
Sampling-Oszillioskop
Echtzeit-Oszillioskop
Sample-by-Sample Unsicherheiten
S-Parameter
Frequenzumwandlung
Netzwerkanalysator (VNA)
Mischer, Phasenreferenz
S-Parameter measurement
Adapter
Calibration
Kalibrierung
Zeitbasis
Ausgangsfrequenzen
Signalgenerator
Frequenzzähler
Josephson-Effekt, Quanten-Hall-Effekt
Impedanzmessung
Quantennormale
Physikalisch-Technische Bundesanstalt
elektrische Quantenmetrologie
Graphen
high voltage
HVDC
UHVDC
high voltage metrology
high voltage measuring techniques
Breitband-Referenzstromwandler
Breitband-Stromverstärker
Breitband-Strommessung
PIM
Mixed-Frequency - S-Parameter
Harmonic Radar Welt
Radar System SEERAD
Harmonic Radar
Kalibrierung LISN
Eingangsimpedanz
Netznachbildung
Adapter LISN
Stromwandler
Nullflusswandler
Hochstrommessung
Linearität
Konformitätsbewertung

description: Vorträge 1. Fortschritte in der Wellenformmetrologie 2. Frequenzumsetzende Messungen 3. S-Parameter Messverfahren für Adapter 4. Kalibrierung der Zeitbasis und Ausgangsfrequenzen von Messgeräten 6. Rückführung von HVDC bis 1600 kV 7. Breitbandiger Stromwandlermessplatz bis 150 kHz für die Messung von Stromstärkeverhältnissen bis 50A 8. Kalibrierverfahren für Vier-Tor-Wechselstrom.Widerstände im Niederfrequenzbereich 9. Detecting PIM Sources for Better 4/5G Mobile Network Performance 10. Mixed-Frequency-S-Parameter für eine Vielzahl von Anwendungen 11. Kalibrierung von V-Netznachbildungen am Beispiel R&S ENV216 12. DC-Kalibrierung von Nullflusswandlern
(501807) Thomas Hedley
Creators: name: Professions, Victorian
Publisher: name: University of Oxford
Year: 2022
Subjects: subject: 220201 Business and Labour History
subject: FOS: Philosophy, ethics and religion
subject: History
subject: 140203 Economic History
subject: FOS: Economics and business

description: This three-year research project began in January 2014 and investigated whether, during the Victorian period, the professions formed a distinct self-sustaining social group with its own mores and values. The project looked at 16,000 individuals drawn from census data for Alnwick, Brighton, Bristol, Dundee, Greenock, Leeds, Merthyr Tydfil, Morpeth, and Winchester. The research project was funded by the UK Economic & Social Research Council and was based at the Universities of Oxford and Northumbria.