cometadata/datacite-rtg-text-other-reclassification-records huggingface dataset:
A local analysis of contemporary Chinese/- Australian art by Guan Wei, Wang Zhiyuan and Ah Xian using a global aesthetic
Creators: name: Ash, AJ
Publisher: name: CQUniversity
Year: 2023
Subjects: classificationCode: 360104
subject: Visual cultures

description: Study examines "the contemporary art practice of three diasporic artists: Guan Wei, Wang Zhiyuan, and Ah Xian and documents their practice and analyses their work using contextual methods".. This project sheds light on Australian art that reflects an emerging global aesthetic. I map the historically oriented relations of artistic exchange in the Asia-Australia region with a focus on contemporary hybrid art created by diasporic artists. I am primarily concerned with the mobile and adaptive cultural exchanges between cultures in response to globalisation. Globalisation is seen as the tension between the global and the local where each informs the other. The underlying processes of globalisation are used to develop an aesthetic that underpins contemporary hybrid art practice located on the interstice between the global and local. I outline a new aesthetics to engage with such transformational art based on multiaxiality, dispersion, transience, unassimilabilty, translation and hybridity. Through case study, I address the contemporary art practice of three diasporic artists: Guan Wei, Wang Zhiyuan, and Ah Xian using a global aesthetic. Taking the artwork of these artists, I document their practice and analyse their work using contextual methods. Finally, I detail the outcomes and syntheses of the research emerging from history, place, theory and most importantly art practice informed by globalisation. The study has implications for artists, theorists, historians, and critics concerning specifically Chinese/-Australian art and contemporary hybrid art in Australia and Asia.
A Census of Star-Forming Galaxies in the z~9-10 Universe based on HST+Spitzer Observations Over 19 CLASH clusters: Three Candidate z~9-10 Galaxies and Improved Constraints on the Star Formation Rate Density at z~9
Creators: name: Bouwens, R.
name: Bradley, L.
name: Zitrin, A.
name: Coe, D.
name: Franx, M.
name: Zheng, W.
name: Smit, R.
name: Host, O.
name: Postman, M.
name: Moustakas, L.
name: Labbe, I.
name: Carrasco, M.
name: Molino, A.
name: Donahue, M.
name: Kelson, D. D.
name: Meneghetti, M.
name: Benitez, N.
name: Lemze, D.
name: Umetsu, K.
name: Broadhurst, T.
name: Moustakas, J.
name: Rosati, P.
name: Bartelmann, M.
name: Ford, H.
name: Graves, G.
name: Grillo, C.
name: Infante, L.
name: Jiminez-Teja, Y.
name: Jouvel, S.
name: Lahav, O.
name: Maoz, D.
name: Medezinski, E.
name: Melchior, P.
name: Merten, J.
name: Nonino, M.
name: Ogaz, S.
name: Seitz, S.
Publisher: name: arXiv
Year: 2012
Subjects: subject: Cosmology and Nongalactic Astrophysics (astro-ph.CO)
subject: FOS: Physical sciences

description: We utilise a two-color Lyman-Break selection criterion to search for z~9-10 galaxies over the first 19 clusters in the CLASH program. A systematic search yields three z~9-10 candidates. While we have already reported the most robust of these candidates, MACS1149-JD, two additional z~9 candidates are also found and have H_{160}-band magnitudes of ~26.2-26.9. A careful assessment of various sources of contamination suggests 8. Compared to similar evolutionary findings from the HUDF, our result is less insensitive to large-scale structure uncertainties, given our many independent sightlines on the high-redshift universe.
description: 22 pages, 11 figures, 5 tables, accepted for publication in the Astrophysical Journal, updated to include the much deeper Spitzer/IRAC observations over our three z~9-10 candidates
Lee-Yang zeros in the Rydberg atoms
Creators: name: Li, Chengshu
name: Yang, Fan
Publisher: name: arXiv
Year: 2022
Subjects: subject: Statistical Mechanics (cond-mat.stat-mech)
subject: Quantum Gases (cond-mat.quant-gas)
subject: FOS: Physical sciences

description: Lee-Yang (LY) zeros play a fundamental role in the formulation of statistical physics in terms of (grand) partition functions, and assume theoretical significance for the phenomenon of phase transitions. In this paper, motivated by recent progress in cold Rydberg atom experiments, we explore the LY zeros in classical Rydberg blockade models. We find that the distribution of zeros of partition functions for these models in one dimension (1d) can be obtained analytically. We prove that all the LY zeros are real and negative for such models with arbitrary blockade radii. Therefore, no phase transitions happen in 1d classical Rydberg chains. We investigate how the zeros redistribute as one interpolates between different blockade radii. We also discuss possible experimental measurements of these zeros.
description: 8 pages, 4 figures
Introducing a Symmetry-Breaking Coupler into a Dielectric Metasurface Enables Robust High-Q Quasibound States in the Continuum and Efficient Nonlinear Frequency Conversion
Creators: name: Moretti, Gianni Q.
name: Tittl, Andreas
name: Cortés, Emiliano
name: Maier, Stefan A.
name: Bragas, Andrea V.
name: Grinblat, Gustavo
Publisher: name: arXiv
Year: 2022
Subjects: subject: Optics (physics.optics)
subject: FOS: Physical sciences

description: Dielectric metasurfaces supporting quasi-bound states in the continuum (quasi-BICs) exhibit very high quality factor resonances and electric field confinement. However, accessing the high-Q end of the quasi-BIC regime usually requires marginally distorting the metasurface design from a BIC condition, pushing the needed nanoscale fabrication precision to the limit. This work introduces a novel concept for generating high-Q quasi-BICs, which strongly relaxes this requirement by incorporating a relatively large perturbative element close to high-symmetry points of an undistorted BIC metasurface, acting as a coupler to the radiation continuum. We validate this approach by adding a $\sim$100 nm diameter cylinder between two reflection-symmetry points separated by a 300 nm gap in an elliptical disk metasurface unit cell, using gallium phosphide as the dielectric. We find that high-Q resonances emerge when the cylindrical coupler is placed at any position between such symmetry points. We further explore this metasurface's second harmonic generation capability in the optical range. Displacing the coupler as much as a full diameter from a BIC condition produces record-breaking normalized conversion efficiencies >10$^{2}$ W$^{-1}$. The strategy of enclosing a disruptive element between multiple high-symmetry points in a BIC metasurface could be applied to construct robust high-Q quasi-BICs in many geometrical designs.
description: 21 pages, 8 figures
Schulleitungsmonitor Deutschland 2022 - Schulen in sozial benachteiligter und nicht benachteiligter Lage - Gesamtbericht
Creators: name: Tulowitzki, Pierre
name: Ruf, Lea
name: Sposato, Gloria Grazia
name: Witthöft, Jasmin
name: Pietsch, Marcus
Publisher: name: Pädagogische Hochschule FHNW
Year: 2023
Subjects: subject: Schulleitung
subject: Schulentwicklung
subject: Brennpunkt
subject: soziale Lage
subject: soziale Gerechtigkeit
subject: 370 - Erziehung, Schul- und Bildungswesen

description: Für den vorliegenden Bericht wurden Antworten der Schulleitungen aus dem Projekt „Schulleitungsmonitor Deutschland 2022“, die angaben, eine Schule in einem „sozialen Brennpunkt“, das heißt in sozial benachteiligter Lage, zu leiten (22,8 %, N=224) und derjenigen, die angaben, eine Schule zu leiten, die sich nicht in sozial benachteiligter Lage befindet (77,2 %, N=760), miteinander verglichen. 23 Personen machten bezüglich der Lage ihrer Schule keine Angabe; ihre Rückmeldungen wurden für die vorliegende Auswertung folglich nicht berücksichtigt. Nachfolgend werden die Ergebnisse anhand der Themenbereiche „Arbeitszeit und Arbeitsbereiche“, „Qualifizierung sowie Fort- und Weiterbildung“, „Wohlbefinden und Belastung“, „Zusammenarbeit und Kooperation“ und „Digitalisierung und Innovationen“ vorgestellt.
Decolonising National Museums Of Ethnography In Europe: Exposing And Reshaping Colonial Heritage (2000-2012)
Creators: name: Bodenstein, Felicity
name: Pagani, Camilla
Publisher: name: Zenodo
Year: 2014
Subjects: museum, heritage, ethnography

description: The volume "The Postcolonial Museum" examines how we can conceive of a ‘postcolonial museum’ in the contemporary epoch of mass migrations, the internet and digital technologies. In particular, the essay by Felicity Bodenstein and Camilla Pagani focus on how museums reshape their colonial heritage using the museum as a space for recognition and historical reconciliation.
Ethnographic Museums: From Colonial Exposition To Intercultural Dialogue
Creators: name: Boursiquot, Fabienne
Publisher: name: Zenodo
Year: 2014
Subjects: museum, ethnography, anthropology

description: The volume "The Postcolonial Museum" examines how we can conceive of a ‘postcolonial museum’ in the contemporary epoch of mass migrations, the internet and digital technologies. In particular, the essay by Fabienne Boursiquot offers a genealogy of the new museums of society by taking into account a paradigm shift that occurred in anthropology itself.
Initial analysis of the impact of the Ukrainian power grid synchronization with Continental Europe
Creators: name: Böttcher, Philipp C.
name: Gorjão, Leonardo Rydin
name: Beck, Christian
name: Jumar, Richard
name: Maass, Heiko
name: Hagenmeyer, Veit
name: Witthaut, Dirk
name: Schäfer, Benjamin
Publisher: name: arXiv
Year: 2022
Subjects: subject: Physics and Society (physics.soc-ph)
subject: Systems and Control (eess.SY)
subject: FOS: Physical sciences
subject: FOS: Electrical engineering, electronic engineering, information engineering

description: When Russia invaded Ukraine on the 24\textsuperscript{th} of February 2022, this led to many acts of solidarity with Ukraine, including support for its electricity system. Just 20 days after the invasion started, the Ukrainian and Moldovan power grids were synchronized to the Continental European power grid to provide stability to these grids. Here, we present an initial analysis of how this synchronization affected the statistics of the power grid frequency and cross-border flows of electric power within Continental Europe. We observe faster inter-area oscillations, an increase in fluctuations and changes in the cross-border flows in and out of Ukraine and surrounding countries as an effect of the synchronization with Continental Europe. Overall these changes are small such that the now connected system can be considered as stable as before the synchronization.
description: 7 pages, 6 figures
Quilting professional stories: A gendered experience of choosing social work as a career
Creators: name: Mensinga, Joanna
Publisher: name: CQUniversity
Year: 2023
Subjects: classificationCode: 440999
subject: Social work not elsewhere classified

description: The literature and research investigating why people choose social work as a career has tended to focus on motivational traits rather than on the choice experience itself. Whereas the vocational sector has moved to include a focus on the narrative processes involved with selecting a career, much of the social work research fails to capture the meaning-making processes individuals engage in to make sense of their career choices within their personal and social contexts. This research project describes the meaning-making processes two students participating in the social work program at Central Queensland University and I employ to understand our career choice experiences. Over a period of four years, using a research approach that combines Clandinin and Connellys (2000) narrative inquiry with Riessmans (2003) emphasis on social positioning within narratives, Geraldine, John and I explore the interplay between individual, community and professional agendas in our past, present and imagined career choice experiences particularly focusing on the impact of gender. Identifying the importance of caring as a hallmark of the profession and what draws us to social work, this co-constructed research text highlights the agendas that predominantly support womens entrance into the profession and challenge mens participation. Drawing on the metaphor of a quilt to describe our career choice experience, this project draws attention to the importance for aspiring social workers to carefully choose, cut and join together bits of gendered narrative material to create a professional story that both legitimises their entrance into the profession and to position them within the larger career sector.
Performance In The Museum Space (For A Wandering Society)
Creators: name: Parati, Margherita
Publisher: name: Zenodo
Year: 2014
Subjects: performance, museum, architecture

description: The volume "The Postcolonial Museum" examines how we can conceive of a ‘postcolonial museum’ in the contemporary epoch of mass migrations, the internet and digital technologies. In particular, the essay by Margherita Parati focuses on a specific phenomenon: the use and re-evaluation of performing language, based on direct actions and physical experience, in museum narrations and spaces.
Generalized Skyrmions in QCD and the Electroweak Sector
Creators: name: Ellis, John
name: Karliner, Marek
name: Praszalowicz, Michal
Publisher: name: arXiv
Year: 2012
Subjects: subject: High Energy Physics - Phenomenology (hep-ph)
subject: High Energy Astrophysical Phenomena (astro-ph.HE)
subject: High Energy Physics - Experiment (hep-ex)
subject: FOS: Physical sciences

description: We discuss the stability and masses of topological solitons in QCD and strongly-interacting models of electroweak symmetry breaking with arbitrary combinations of two inequivalent Lagrangian terms of fourth order in the field spatial derivatives. We find stable solitons for only a restricted range of the ratio of these combinations, in agreement with previous results, and we calculate the corresponding soliton masses. In QCD, the experimental constraints on the fourth-order terms force the soliton to resemble the original Skyrmion solution. However, this is not necessarily the case in strongly-interacting models of electroweak symmetry breaking, in which a non-Skyrmion-like soliton is also possible. This possibility will be constrained by future LHC measurements and dark matter experiments. Current upper bounds on the electroweak soliton mass range between 18 and 59 TeV, which would be reduced to 4.6 to 8.1 TeV with the likely sensitivity of LHC data to the fourth-order electroweak Lagrangian parameters.
description: 19 pages, 6 pdf figures, version accepted in JHEP
Scale growth study in a concentric reducer: Measurement of instantaneous velocity using Particle Image Velocimetry
Creators: name: Rasheed, Tabassum
Publisher: name: CQUniversity
Year: 2023
Subjects: classificationCode: 401499
subject: Manufacturing engineering not elsewhere classified

description: A series of experiments were conducted at Queensland Alumina Ltd to study the rate of Gibbsite scale formation on wall pipes.. "Gibbsite scale growth in pipe fittings is a major problem for an alumina refinery. A recent investigation into the scale growth mechanism at an alumina refinery found almost 60 % more scale growth in a reducer when compared with the connecting straight pipe sections for similar flow conditions. Scale growth occurs where liquor (supersaturated solutions) come in contact with solid surfaces and it is affected by the liquor flow velocity besides other physical and chemical parameters. The present work is dedicated to study the hydro-dynamical aspects of the mechanism of scale growth. In particular, the role of the phenomenon of turbulent bursting, stream wise and cross stream fluctuating velocity components (Ux and Uy) was investigated as the flow moves through the reducer. Particle Image Velocimetry (PIV) technique was used to get a full view of the reducer and the readings close-to-the-wall of the reducer at Reynolds number of 27,000 and 44,000 upstream which corresponds to Reynolds number of 41,500 and 66,000 downstream of the reducer respectively. The results showed an increase in cross stream and a decrease in magnitude of stream wise fluctuating velocity components, whereby we presume that the increased cross stream fluctuating velocity component increases the frequency of impacts of the scaling particles on the wall thus initiating excessive scale growth in the reducer when compared with the connecting straight pipe sections, for similar flow conditions." -- abstract
Coding/Decoding The Archive
Creators: name: Gauthier, David
name: Cour, Erin La
Publisher: name: Zenodo
Year: 2014
Subjects: archive, art, event

description: The volume "The Postcolonial Museum" examines how we can conceive of a ‘postcolonial museum’ in the contemporary epoch of mass migrations, the internet and digital technologies. In particular, the essay by David Gauthier and Erin La Cour assert that ‘errors’ serve as ontological ground from which the subjectivity imposed upon us by the medium of the archive can be undermined, which can lend an innovative approach to practical applications in artistic and archival research and practice.
‘The Lived Moment’: New Aesthetics For Migrant Recollection
Creators: name: Leese, Peter
Publisher: name: Zenodo
Year: 2014
Subjects: migrant, aesthetic, experience

description: The volume "The Postcolonial Museum" examines how we can conceive of a ‘postcolonial museum’ in the contemporary epoch of mass migrations, the internet and digital technologies. In particular, the essay by Peter Leese suggests a rich source of aesthetic strategies for the portrayal of migrant experience.
The Limits To Institutional Change: Organisational Roles And Roots
Creators: name: Levitt, Peggy
Publisher: name: Zenodo
Year: 2014
Subjects: museum, identity, nation

description: The volume "The Postcolonial Museum" examines how we can conceive of a ‘postcolonial museum’ in the contemporary epoch of mass migrations, the internet and digital technologies. In particular, the essay by Peggy Levitt presents some findings that are part of a larger study of how museums around the world are responding to immigration and globalisation.
On-site wastewater treatment and reuse using recirculatory evapotranspiration channels in regional Queensland
Creators: name: Kele, Benjamin
Publisher: name: CQUniversity
Year: 2023
Subjects: classificationCode: 349999
subject: Other chemical sciences not elsewhere classified

description: "The Central Queensland University developed an on-site wastewater treatment and reuse technology. Septic tanks were used for primary treatment and the discharged effluent was then pumped though a series of contained channels. The channels were designed to be a modified evapotranspiration trench; they were comprised of an aggregate layer and a soil layer in which were planted a variety of plants. The aggregate and the soil provided physical filtration, the microorganisms within the effluent, aggregate and soil provided nutrient reuse and transformation and the plants also used the nutrients and reused the treated effluent through evapotranspiration. Any effluent that was not transpired was returned to a holding tank and pumped through the evapotranspiration again. The treatment technology was assessed in relation to its ability to treat effluent in a sustainable manner. The water and soil was examined for concentrations of nutrients, heavy metals, salts, sodium, and organic carbon %. The pH, temperature and number of colony forming units of certain microorganism potential pathogens were also inspected in the soil and the water. The plants grown within the evapotranspiration channels were assessed in regards to their health, water usage, and in some cases potential pathogens on fruit. The infrastructure that was used to construct the wastewater treatment and reuse system was also evaluated in regards to reliability and maintenance. Certain limiting factors, in particular sodicity and salinity were identified, but the trial was successful and a sustainable form of on-site wastewater treatment and reuse technology was developed." --abstract
On state transfer in Cayley graphs for abelian groups
Creators: name: Árnadóttir, Arnbjörg Soffía
name: Godsil, Chris
Publisher: name: arXiv
Year: 2022
Subjects: subject: Combinatorics (math.CO)
subject: Quantum Physics (quant-ph)
subject: FOS: Mathematics
subject: FOS: Physical sciences

description: In this paper, we characterize perfect state transfer in Cayley graphs for abelian groups that have a cyclic Sylow-2-subgroup. This generalizes a result of Bašić from 2013 where he provides a similar characterization for Cayley graphs of cyclic groups.
description: 21 pages, 1 figure
Off-line test selection with test purposes for non-deterministic timed automata
Creators: name: Bertrand, Nathalie
name: Jéron, Thierry
name: Stainer, Amélie
name: Krichen, Moez
Publisher: name: arXiv
Year: 2012
Subjects: subject: Formal Languages and Automata Theory (cs.FL)
subject: FOS: Computer and information sciences
subject: D.2.4; D.2.5; D.4.7; F.1.1

description: This article proposes novel off-line test generation techniques from non-deterministic timed automata with inputs and outputs (TAIOs) in the formal framework of the tioco conformance theory. In this context, a first problem is the determinization of TAIOs, which is necessary to foresee next enabled actions after an observable trace, but is in general impossible because not all timed automata are determinizable. This problem is solved thanks to an approximate determinization using a game approach. The algorithm performs an io-abstraction which preserves the tioco conformance relation and thus guarantees the soundness of generated test cases. A second problem is the selection of test cases from a TAIO specification. The selection here relies on a precise description of timed behaviors to be tested which is carried out by expressive test purposes modeled by a generalization of TAIOs. Finally, an algorithm is described which generates test cases in the form of TAIOs equipped with verdicts, using a symbolic co-reachability analysis guided by the test purpose. Properties of test cases are then analyzed with respect to the precision of the approximate determinization: when determinization is exact, which is the case on known determinizable classes, in addition to soundness, properties characterizing the adequacy of test cases verdicts are also guaranteed.
description: 33 pages; Logical Methods in Computer Science 2002; 10.2168/LMCS-???
Changing mindsets: A study of Queensland primary teachers and the visual literacy initiative
Creators: name: McDougall, Jenny
Publisher: name: CQUniversity
Year: 2023
Subjects: classificationCode: 390101
subject: Creative arts, media and communication curriculum and pedagogy

description: "Changing mindsets' is about how teachers are engaging with visual literacy the practices involved in understanding and creating visual texts. The concept of visual literacy, like other new literacies, has arisen in response to changing communication practices in developed, capitalist societies like Australia. This study addresses the ways in which teachers in primary schools are engaging with the visual literacy initiative in the context of the new arts syllabus (Years 1-10) in Queensland. Using a broadly poststructural approach, this thesis explored the changing mindsets implied by this curriculum initiative from three perspectives. The concept of preservation of self (Nias, 1987, 1993) was used to examine the personal dimension of change; the concept of trendy theory (Goodson, 1988, 1994, 1997) addressed the social and political agendas that drive curriculum reform; while the concept of multimodality (Kress, 2000a, 2000b, 2003a, 2003b) drew attention to the cultural values ascribed to different modes of communication. Semi-structured interviews were conducted with 26 primary teachers from 11 government schools in a regional centre in 2002. The discourse analysis method was used to analyse the data resulting from these interviews. The data showed that the official discourses featured in the new arts syllabus did not match the discourses used by practising teachers. Although there was some recognition of the significance of the visual mode, most teachers in this study were not aware of visual literacy. Significantly, the agency exercised by teachers in curriculum reform was shaped not only by their personal identities, but also by the levels of support that they experienced in their working environments. These findings have crucial implications for policy-makers in implementing curriculum change, particularly in the context of the new arts syllabus." -- abstract
Symmetries and propagator in multifractional scalar field theory
Creators: name: Calcagni, Gianluca
name: Nardelli, Giuseppe
Publisher: name: arXiv
Year: 2012
Subjects: subject: High Energy Physics - Theory (hep-th)
subject: High Energy Physics - Phenomenology (hep-ph)
subject: Mathematical Physics (math-ph)
subject: FOS: Physical sciences

description: The symmetries of a scalar field theory in multifractional spacetimes are analyzed. The free theory realizes the Poincaré algebra, and the associated symmetries are modifications of ordinary translations and Lorentz transformations. In the interacting case, the Poincaré algebra is broken by interaction terms. The Feynman propagator of the scalar field is computed and found to possess the usual mass poles. As a consequence of these findings, the mass of a particle is a well-defined concept at all scales, and a perturbative quantum theory can be constructed.
description: 15 pages, 1 double figure. v2-3: discussion improved, results unchanged, typos corrected
Mining The Museum In An Age Of Migration
Creators: name: Petersen, Anne Ring
Publisher: name: Zenodo
Year: 2014
Subjects: museum, postcoloniality, aesthetic

description: The volume "The Postcolonial Museum" examines how we can conceive of a ‘postcolonial museum’ in the contemporary epoch of mass migrations, the internet and digital technologies. In particular, the essay by Anne Ring Petersen states that artistic interventions such as those of Fred Wilson and Yinka Shonibare are capable of disrupting the traditional order of objects in Western museums and of questioning naturalised understandings of history.
On Quantum and Classical Treatments of Radiative Recombination
Creators: name: L., Barabanov A.
name: M., Belotsky K.
name: A., Esipova E.
name: S., Kalashnikov D.
name: Yu, Letunov A.
Publisher: name: arXiv
Year: 2022
Subjects: subject: Cosmology and Nongalactic Astrophysics (astro-ph.CO)
subject: High Energy Physics - Theory (hep-th)
subject: Quantum Physics (quant-ph)
subject: FOS: Physical sciences

description: The quantum-mechanical solution to the problem of radiative recombination of an electron in a Coulomb field, obtained in the approximation of the smallness of the electron coupling with the radiation field, has been known for a long time. However, in astrophysics, the classical approach, which does not explicitly use this smallness, is sometimes used to describe similar processes in systems of magnetic monopoles or self-interacting dark matter particles. The importance of such problems is determined by the fact that recombination processes play a crucial role in the evolution of the large-scale structure of the Universe. Therefore, of particular interest is the fact that the classical and quantum expressions for the recombination cross section differ significantly in magnitude. It is shown that the applicability of quantum and classical approaches to radiative recombination is closely related to the radiated angular momentum and its quantization. For situations where the classical approach is not suitable, a semi-classical approach based on the angular momentum quantization is proposed, in some respects an alternative to the well-known semi-classical Kramers' approach.
J.-L. Le Cam, Politique, contrôle et réalité scolaire en Allemagne au sortir de la Guerre de Trente Ans. Tome I: La politique scolaire d'August Le Jeune de Brunswick-Wolfenbüttel et l'inspecteur Christoph Schrader 1635-1666/80. Mit deutscher Zusammenfassu
Creators: name: Andermann, Kurt
Publisher: name: Francia
Year: 2019

description: Francia, Bd. 27 Nr. 2 (2000)
Universality and intermittency in relativistic turbulent flows of a hot plasma
Creators: name: Radice, David
name: Rezzolla, Luciano
Publisher: name: arXiv
Year: 2012
Subjects: subject: High Energy Astrophysical Phenomena (astro-ph.HE)
subject: General Relativity and Quantum Cosmology (gr-qc)
subject: Fluid Dynamics (physics.flu-dyn)
subject: FOS: Physical sciences

description: With the aim of determining the statistical properties of relativistic turbulence and unveiling novel and non-classical features, we resent the results of direct numerical simulations of driven turbulence in an ultrarelativistic hot plasma using high-order numerical schemes. We study the statistical properties of flows with average Mach number ranging from $\sim 0.4$ to $\sim 1.7$ and with average Lorentz factors up to $\sim 1.7$. We find that flow quantities, such as the energy density or the local Lorentz factor, show large spatial variance even in the subsonic case as compressibility is enhanced by relativistic effects. The velocity field is highly intermittent, but its power-spectrum is found to be in good agreement with the predictions of the classical theory of Kolmogorov. Overall, our results indicate that relativistic effects are able to significantly enhance the intermittency of the flow and affect the high-order statistics of the velocity field, while leaving unchanged the low-order statistics, which instead appear to be universal and in good agreement with the classical Kolmogorov theory. To the best of our knowledge, these are the most accurate simulations of driven relativistic turbulence to date.
description: 5 pages, 4 figures. Minor changes to match the version accepted on ApJL
Evolutionary learning of control and strategies in robot soccer
Creators: name: Thomas, Peter
Publisher: name: CQUniversity
Year: 2023
Subjects: classificationCode: 400799
subject: Control engineering, mechatronics and robotics not elsewhere classified

description: "Robot soccer provides a fertile environment for the development of artificial intelligence techniques. Robot controls require high speed lower level reactive layers as well as higher level deliberative functions. This thesis focuses on a number of aspects in the robot soccer arena. Topics covered include boundary avoidance strategies, vision detection and the application of evolutionary learning to find fuzzy controllers for the control of mobile robot. A three input, two output controller using two angles and a distance as the input and producing two wheel velocity outputs, was developed using evolutionary learning. Current wheel velocities were excluded from the input. The controller produced was a coarse control permitting only either forward or reverse facing impact with the ball. A five input controller was developed which expanded upon the three input model by including the current wheel velocities as inputs. The controller allowed both forward and reverse facing impacts with the ball. A five input hierarchical three layer model was developed to reduce the number of rules to be learnt by an evolutionary algorithm. Its performance was the same as the five input model. Fuzzy clustering of evolved paths was limited by the information available from the paths. The information was sparse in many areas and did not produce a controller that could be used to control the robots. Research was also conducted on the derivation of simple obstacle avoidance strategies for robot soccer. A new decision region method for colour detection in the UV colour map to enable better detection of the robots using an overhead vision system. Experimental observations are given." -- abstract.
Changing meaning : the leading way
Creators: name: Sytsma, S
Publisher: name: CQUniversity
Year: 2017
Subjects: classificationCode: 390499
subject: Specialist studies in education not elsewhere classified
classificationCode: 399999
subject: Other education not elsewhere classified
classificationCode: 390101
subject: Creative arts, media and communication curriculum and pedagogy

description: "Studying leading as a way of changing meaning, this research documents a journey of inner exploration amongst five self-nominated leaders in education. In contrast to change limited by outer dimensional structure, changing meaning in an inner dimension was seen as the necessary complement in creating real difference in educators and in educating. Over a period of almost a year, the leaders participated in an online project, travelling together through email dialogue focused around leading, changing and meaning. In this, they experimented with a changing way of researching, developing a personalised space of changing in which they could truth-test their thoughts and feelings about the multiple facets of leading and meaning. Such a space - interstitial to their outer working and inner personal lives, but deeply connective of both - was found useful in supporting coherent change processes in the participant leaders." - abstract
The Resistive Nature of Decomposing Interfaces of Solid Electrolytes with Alkali Metal Electrodes
Creators: name: Wang, Juefan
name: Panchal, Abhishek A.
name: Gautam, Gopalakrishnan Sai
name: Canepa, Pieremanuele
Publisher: name: arXiv
Year: 2022
Subjects: subject: Materials Science (cond-mat.mtrl-sci)
subject: Disordered Systems and Neural Networks (cond-mat.dis-nn)
subject: FOS: Physical sciences

description: A crucial ingredient in lithium (Li) and sodium (Na)-ion batteries (LIBs and NIBs) is the electrolytes. The use of Li-metal (Na-metal) as anode in liquid electrolyte LIBs (NIBs) is constrained by several issues including thermal runway and flammability, electrolyte leakage, and limited chemical stability. Considerable effort has been devoted toward the development of solid electrolytes (SEs) and all-solid-state batteries, which are presumed to mitigate some of the issues of Li-metal(Na-metal) in contact with flammable liquid electrolytes. However, most SEs, such as Li$_3$PS$_4$, Li$_6$PS$_5$Cl and Na$_3$PS$_4$ readily decompose against the highly reducing Li-metal and Na-metal anodes. Using first-principles calculations we elucidate the stability of more than 20 solid$||$solid interfaces formed between the decomposition products of Li$_3$PS$_4$, Li$_6$PS$_5$Cl (and Na$_3$PS$_4$) against the Li-metal (Na-metal) electrode. We suggest that the work of adhesion needed to form a hetereogenous interfaces is an important descriptor to quantify the stability of interfaces. Subsequently, we clarify the atomistic origins of the resistance to Li-ion transport at interfaces of the Li-metal anode and selected decomposition products (Li$_3$P, Li$_2$S} and LiCl) of SEs, via a high-fidelity machine learned potential (MLP). Utilising an MLP enables nano-second-long molecular dynamics simulations on `large' interface models (here with 8320 atoms), but with similar accuracy to first-principles approaches. Our simulations demonstrate that the interfaces formed between Li-metal and argyrodite (e.g., Li$_6$PS$_5$Cl) decomposition products are resistive to Li-ion transport. The implications of this study are important since binary compounds are commonly found in the vicinity of Li(Na)-metal upon chemical and/or electrochemical decomposition of ternary and quaternary SEs.
The chain rule implies Tsirelson's bound: an approach from generalized mutual information
Creators: name: Wakakuwa, Eyuri
name: Murao, Mio
Publisher: name: arXiv
Year: 2012
Subjects: subject: Quantum Physics (quant-ph)
subject: FOS: Physical sciences

description: In order to analyze an information theoretical derivation of Tsirelson's bound based on information causality, we introduce a generalized mutual information (GMI), defined as the optimal coding rate of a channel with classical inputs and general probabilistic outputs. In the case where the outputs are quantum, the GMI coincides with the quantum mutual information. In general, the GMI does not necessarily satisfy the chain rule. We prove that Tsirelson's bound can be derived by imposing the chain rule on the GMI. We formulate a principle, which we call the no-supersignalling condition, which states that the assistance of nonlocal correlations does not increase the capability of classical communication. We prove that this condition is equivalent to the no-signalling condition. As a result, we show that Tsirelson's bound is implied by the nonpositivity of the quantitative difference between information causality and no-supersignalling.
description: 23 pages, 8 figures, Added Section 2 and Appendix B, result unchanged, Added references
Hund oder Drache ? : Zu einem hochmittelalterlichen Schreibgriffel aus Trier ; Mit einer Zusammenstellung von Drachengriffeln und einem technologischen Beitrag von Ludwig Eiden
Creators: name: Merten, Jürgen
Publisher: name: Funde und Ausgrabungen im Bezirk Trier
Year: 2019

description: [nicht vorhanden]
description: Funde und Ausgrabungen im Bezirk Trier, Bd. 41 (2009): Funde und Ausgrabungen im Bezirk Trier : Aus der Arbeit des Rheinischen Landesmuseums Trier
Search for anomalous production of highly boosted Z bosons decaying to dimuons in proton-proton collisions at sqrt(s) = 7 TeV
Creators: name: CMS Collaboration
Publisher: name: arXiv
Year: 2012
Subjects: subject: High Energy Physics - Experiment (hep-ex)
subject: FOS: Physical sciences

description: Results are reported from a search for the anomalous production of highly boosted Z bosons with large transverse momentum and decaying to dimuons. Such Z bosons may be produced in the decays of new heavy particles. The search uses pp collision data at sqrt(s) = 7 TeV, corresponding to an integrated luminosity of 5.0 inverse femtobarns recorded with the CMS detector. The shape of the observed transverse-momentum distribution of Z bosons is consistent with standard model expectations. Constraints are obtained on models predicting the production of excited quarks decaying via electroweak processes. Assuming a compositeness scale that is equal to the excited quark mass as well as transition coupling strengths between Z bosons and excited quarks that are equal to standard model couplings to quarks, masses of excited quarks below 1.94 TeV are excluded at the 95% confidence level. For excited quark production via a novel contact interactions, masses below 2.22 TeV are excluded, even if the excited quarks do not couple to gluons.
description: Replaced with published version. Added DOI
Transport properties of a two impurity system: a theoretical approach
Creators: name: Hamad, I. J.
name: Ribeiro, L. Costa
name: Martins, G. B.
name: Anda, E. V.
Publisher: name: arXiv
Year: 2012
Subjects: subject: Mesoscale and Nanoscale Physics (cond-mat.mes-hall)
subject: Strongly Correlated Electrons (cond-mat.str-el)
subject: FOS: Physical sciences

description: A system of two interacting cobalt atoms, at varying distances, was studied in a recent scanning tunneling microscope experiment by Bork et. al.[Nature Phys. 7, 901 (2011)]. We propose a microscopic model that explains, for all experimentally analyzed interatomic distances, the physics observed in these experiments. Our proposal is based on the two-impurity Anderson model, with the inclusion of a two-path geometry for charge transport. This many-body system is treated in the finite-U slave boson mean-field approximation and the logarithmic-discretization embedded-cluster approximation. We physically characterize the different charge transport regimes of this system at various interatomic distances and show that, as in the experiments, the features observed in the transport properties depend on the presence of two impurities but also on the existence of two conducting channels for electron transport. We interpret the splitting observed in the conductance as the result of the hybridization of the two Kondo resonances associated with each impurity.
description: 5 pages, 5 figures
Stochastic Relative Degree and Path-wise Control of Nonlinear Stochastic Systems
Creators: name: Mellone, Alberto
name: Scarciotti, Giordano
Publisher: name: arXiv
Year: 2022
Subjects: subject: Systems and Control (eess.SY)
subject: FOS: Electrical engineering, electronic engineering, information engineering

description: We address the path-wise control of systems described by a set of nonlinear stochastic differential equations. For this class of systems, we introduce a notion of stochastic relative degree and a change of coordinates which transforms the dynamics to a stochastic normal form. The normal form is instrumental for the design of a state-feedback control which linearises and makes the dynamics deterministic. We observe that this control is idealistic, i.e. it is not practically implementable because it employs a feedback of the Brownian motion (which is never available) to cancel the noise. Using the idealistic control as a starting point, we introduce a hybrid control architecture which achieves \emph{practical} path-wise control. This hybrid controller uses measurements of the state to perform periodic compensations for the noise contribution to the dynamics. We prove that the hybrid controller retrieves the idealistic performances in the limit as the compensating period approaches zero. We address the problem of asymptotic output tracking, solving it in the idealistic and in the practical framework. We finally validate the theory by means of a numerical example.
Classifying coalgebra split extensions of Hopf algebras
Creators: name: Agore, A. L.
name: Bontea, C. G.
name: Militaru, G.
Publisher: name: arXiv
Year: 2012
Subjects: subject: Quantum Algebra (math.QA)
subject: Rings and Algebras (math.RA)
subject: FOS: Mathematics
subject: 16T10, 16T05, 16S40

description: For a given Hopf algebra $A$ we classify all Hopf algebras $E$ that are coalgebra split extensions of $A$ by $H_4$, where $H_4$ is the Sweedler's 4-dimensional Hopf algebra. Equivalently, we classify all crossed products of Hopf algebras $A # H_4$ by computing explicitly two classifying objects: the cohomological 'group' ${\mathcal H}^{2} (H_4, A)$ and $\textsc{C}\textsc{r}\textsc{p} (H_4, A) :=$ the set of types of isomorphisms of all crossed products $A # H_4$. All crossed products $A #H_4$ are described by generators and relations and classified: they are parameterized by the set ${\mathcal Z}{\mathcal P} (A)$ of all central primitive elements of $A$. Several examples are worked out in detail: in particular, over a field of characteristic $p \geq 3$ an infinite family of non-isomorphic Hopf algebras of dimension $4p$ is constructed. The groups of automorphisms of these Hopf algebras are also described.
description: 21 pages; substantial changes from previous version; to appear in J. Algebra Appl
Data-Driven Optimal Sensor Placement for High-Dimensional System Using Annealing Machine
Creators: name: Inoue, Tomoki
name: Ikami, Tsubasa
name: Egami, Yasuhiro
name: Nagai, Hiroki
name: Naganuma, Yasuo
name: Kimura, Koichi
name: Matsuda, Yu
Publisher: name: arXiv
Year: 2022
Subjects: subject: Signal Processing (eess.SP)
subject: Methodology (stat.ME)
subject: FOS: Electrical engineering, electronic engineering, information engineering
subject: FOS: Computer and information sciences

description: We propose a novel method for solving optimal sensor placement problem for high-dimensional system using an annealing machine. The sensor points are calculated as a maximum clique problem of the graph, the edge weight of which is determined by the proper orthogonal decomposition (POD) mode obtained from data based on the fact that a high-dimensional system usually has a low-dimensional representation. Since the maximum clique problem is equivalent to the independent set problem of the complement graph, the independent set problem is solved using Fujitsu Digital Annealer. As a demonstration of the proposed method, the pressure distribution induced by the Kármán vortex street behind a square cylinder is reconstructed based on the pressure data at the calculated sensor points. The pressure distribution is measured by pressure-sensitive paint (PSP) technique, which is an optical flow diagnose method. The root mean square errors (RMSEs) between the pressure measured by pressure transducer and the reconstructed pressures (calculated from the proposed method and an existing greedy method) at the same place are compared. As the result, the similar RMSE is achieved by the proposed method using approximately 1/5 number of sensor points obtained by the existing method. This method is of great importance as a novel approach for optimal sensor placement problem and a new engineering application of an annealing machine.
Computing spacetime
Creators: name: Pedraza, Juan F.
name: Russo, Andrea
name: Svesko, Andrew
name: Weller-Davies, Zachary
Publisher: name: arXiv
Year: 2022
Subjects: subject: High Energy Physics - Theory (hep-th)
subject: General Relativity and Quantum Cosmology (gr-qc)
subject: Quantum Physics (quant-ph)
subject: FOS: Physical sciences

description: Inspired by the universality of computation, we advocate for a principle of spacetime complexity, where gravity arises as a consequence of spacetime optimizing the computational cost of its own quantum dynamics. This principle is explicitly realized in the context of the Anti-de Sitter/Conformal Field Theory correspondence, where complexity is naturally understood in terms of state preparation via Euclidean path integrals, and Einstein's equations emerge from the laws of quantum complexity. We visualize spacetime complexity using Lorentzian threads which, conceptually, represent the operations needed to prepare a quantum state in a tensor network discretizing spacetime. Thus, spacetime itself evolves via optimized computation.
description: 9 pages, 2 figures, Received honorable mention for the 2022 Essay Competition of the Gravity Research Foundation; References added, to appear in the October 2022 Special Issue of the International Journal of Modern Physics D
Assessment of an energy-based surface tension model for simulation of two-phase flows using second-order phase field methods
Creators: name: Mirjalili, Shahab
name: Khanwale, Makrand A
name: Mani, Ali
Publisher: name: arXiv
Year: 2022
Subjects: subject: Fluid Dynamics (physics.flu-dyn)
subject: Numerical Analysis (math.NA)
subject: Computational Physics (physics.comp-ph)
subject: FOS: Physical sciences
subject: FOS: Mathematics

description: Second-order phase field models have emerged as an attractive option for capturing the advection of interfaces in two-phase flows. Prior to these, state-of-the-art models based on the Cahn-Hilliard equation, which is a fourth-order equation, allowed for the derivation of surface tension models through thermodynamic arguments. In contrast, the second-order phase field models do not follow a known energy law, and deriving a surface tension term for these models using thermodynamic arguments is not straightforward. In this work, we justify that the energy-based surface tension model from the Cahn-Hilliard context can be adopted for second-order phase field models as well and assess its performance. We test the surface tension model on three different second-order phase field equations; the conservative diffuse interface model of Chiu and Lin [1], and two models based on the modified Allen-Cahn equation introduced by Sun and Beckermann [2]. Additionally, we draw the connection between the energy-based model with a localized variation of the continuum surface force (CSF) model. Using canonical tests, we illustrate the lower magnitude of spurious currents, better accuracy, and superior convergence properties of the energy-based surface tension model compared to the CSF model, which is a popular choice used in conjunction with second-order phase field methods, and the localized CSF model. Importantly, in terms of computational expense and parallel efficiency, the energy-based model incurs no penalty compared to the CSF models.
description: 13 pages, 5 figures, Revision submitted to Journal of Computational Physics