cometadata/datacite-rtg-text-other-reclassification-records huggingface dataset:
Orthogonal vertical velocity dispersion distributions produced by bars
Creators: name: Du, Min
name: Shen, Juntai
name: Debattista, Victor P.
name: de Lorenzo-Cáceres, Adriana
Publisher: name: arXiv
Year: 2016
Subjects: subject: Astrophysics of Galaxies (astro-ph.GA)
subject: FOS: Physical sciences

description: In barred galaxies, the contours of stellar velocity dispersions ($σ$) are generally expected to be oval and aligned with the orientation of bars. However, many double-barred (S2B) galaxies exhibit distinct $σ$ peaks on the minor axis of inner bars, which we termed "$σ$-humps," while two local $σ$ minima are present close to the ends of inner bars, i.e., "$σ$-hollows." Analysis of numerical simulations shows that $σ_z$-humps or hollows should play an important role in generating the observed $σ$-humps+hollows in low-inclination galaxies. In order to systematically investigate the properties of $σ_z$ in barred galaxies, we apply the vertical Jeans equation to a group of well-designed three-dimensional bar+disk(+bulge) models. A vertically thin bar can lower $σ_z$ along the bar and enhance it perpendicular to the bar, thus generating $σ_z$-humps+hollows. Such a result suggests that $σ_z$-humps+hollows can be generated by the purely dynamical response of stars in the presence of a, sufficiently massive, vertically thin bar, even without an outer bar. Using self-consistent $N$-body simulations, we verify the existence of vertically thin bars in the nuclear-barred and S2B models which generate prominent $σ$-humps+hollows. Thus the ubiquitous presence of $σ$-humps+hollows in S2Bs implies that inner bars are vertically thin. The addition of a bulge makes the $σ_z$-humps more ambiguous and thus tends to somewhat hide the $σ_z$-humps+hollows. We show that $σ_z$ may be used as a kinematic diagnostic of stellar components that have different thickness, providing a direct perspective on the morphology and thickness of nearly face-on bars and bulges with integral field unit spectroscopy.
description: 14 pages, 16 figures. Accepted for publication in ApJ
femtosecond laser ablation
Creators: name: Margetic, Vanja
Publisher: name: Universität Dortmund
Year: 2003
Subjects: subject: femtosecond laser ablation
subject: in-depth profiling
subject: elemental fractionation
subject: Abtrag
subject: Tiefenprofilanalyse
subject: Fraktionierung
subject: 530

description: Femtosecond laser ablation was investigated as a solid sampling method for elemental chemical analysis. In comparison to the sampling with longer laser pulses, two aspects could be improved by using ultrashort pulses: elimination of the elemental fractionation from the ablation crater, which is necessary for an accurate quantitative analysis, and better control of the material removal (especially for metals), which increases the spatial resolution of microanalysis. Basic aspects of ultrashort laser ablation were studied using laser induced fluorescence (LIF), laser induced breakdown spectroscopy (LIBS) and laser ablation time of flight mass spectrometry (LA-TOF-MS). The results of the LIF study of plasma expansion fit to the spherical expansion model. The spectroscopic studies of plasma emission and determination of the excitation temperature served to find suitable conditions for quantitative elemental analysis by LIBS. The highly energetic ions (10 keV) that antecede the plume expansion were observed under high vacuum conditions in the TOF spectrometer during ablation of metals and semiconductors. Measurements with additional acceleration indicate high ionisation states.The elimination of the elemental fractionation was demonstrated in LIBS and fs laser ablation inductively coupled plasma mass spectrometry (LA-ICP-MS) experiments on metals, alloys and glass samples. The in-depth profiling of thin layered structures was proposed as the most promissing application of the femtosecond laser ablation in chemical analytics. Rapid analysis of multilayered samples with depth resolution better than 100 nm and lateral resolution of 10-50 µm is feasible. A homogeneous laser beam intensity profile and a high pulse-to-pulse energy stability are the prerequisites for a successful in-depth profiling.
Sandawe as a linguistic island: distinctiveness in diversity
Creators: name: Eaton, Helen
Publisher: name: Zenodo
Year: 2019
Subjects: Languages of Tanzania
Tanzanian Rift Valley Area
Sandawe
Linguistic islands
Linguistic typology

description: The Sandawe language community is surrounded by languages from different language families, yet retains a special distinctiveness in this context by virtue of its unusual phonology and its status as a relic of the original inhabitants of the area. This talk examines the reasons for the Sandawe community’s situation and its continued survival. This takes in a discussion of the sociocultural features of the community, the typological features of the language and attitudes to being Sandawe.
description: Note: This talk has not gone through a process of peer review, and findings should therefore be treated as preliminary and subject to change. Acknowledgement and citation: Eaton, Helen. 2019. Sandawe as a linguistic island: distinctiveness in diversity. Talk given at the Rift Valley Network Webinar Series. 12/06/2019.
DIGITAL SOLUTIONS OF MANAGEMENT ISSUES AND STRATEGIC PLANNING FOR THE DEVELOPMENT OF AGRICULTURE AND RURAL AREAS
Creators: name: I. M. Kulikov, A. N. Semin
Publisher: name: TuEngr Group
Year: 2019
Subjects: Rural territories
Management
Economics
Production processes transformation
Rural development
Development planning
Technological shifts
Agriculture development
Digital technologies
Agro-development.

description: International Transaction Journal of Engineering, Management, & Applied Sciences & Technologies, 10, 18, 10A18D: 1-13
Dynamical response near quantum critical points
Creators: name: Lucas, Andrew
name: Gazit, Snir
name: Podolsky, Daniel
name: Witczak-Krempa, William
Publisher: name: arXiv
Year: 2016
Subjects: subject: Strongly Correlated Electrons (cond-mat.str-el)
subject: Quantum Gases (cond-mat.quant-gas)
subject: Statistical Mechanics (cond-mat.stat-mech)
subject: High Energy Physics - Theory (hep-th)
subject: FOS: Physical sciences

description: We study high frequency response functions, notably the optical conductivity, in the vicinity of quantum critical points (QCPs) by allowing for both detuning from the critical coupling and finite temperature. We consider general dimensions and dynamical exponents. This leads to a unified understanding of sum rules. In systems with emergent Lorentz invariance, powerful methods from conformal field theory allow us to fix the high frequency response in terms of universal coefficients. We test our predictions analytically in the large-N O(N) model and using the gauge-gravity duality, and numerically via Quantum Monte Carlo simulations on a lattice model hosting the interacting superfluid-insulator QCP. In superfluid phases, interacting Goldstone bosons qualitatively change the high frequency optical conductivity, and the corresponding sum rule.
description: 4+12 pages. 2+2 figures. v2: Added explanations throughout, and new results in Appendix C for the ordered phase. Published version
Lattice path integral approach to the Kondo model
Creators: name: Bortz, Michael
Publisher: name: Universität Dortmund
Year: 2004
Subjects: subject: Kondo model
subject: impurity
subject: lattice path integral
subject: Trotter-Suzuki decomposition
subject: algebraic Bethe-ansatz
subject: super-Lie-algebra
subject: regularization
subject: Wilson number
subject: Kondomodell
subject: Störstelle
subject: Gitterpfadintegral
subject: Trotter-Suzuki-Zerlegung
subject: algebraischer Bethe-Ansatz
subject: Superliealgebra
subject: Regularisierung
subject: Wilsonzahl
subject: 530

description: Es wird eine Gitterregularisierung des isotropen Kondomodells (ein Kanal, Spin-1/2) vorgeschlagen. Mit Symmetrieargumenten werden effektive Modelle für den allgemeineren anisotropen, m-Kanal, Spin-S Fall angegeben. Durch die Anwendung des Quantentransfermatrixformalismus werden die freie Energie und andere thermodynamische Gleichgewichtsantwortfunktionen exakt durch einen Satz von [max(2S,m)+1] nichtlinearen Integralgleichungen erhalten. Diese werden analytisch in gewissen Grenzfällen der externen Parameter (Temperatur, Magnetfeld) sowie numerisch über weite Parameterbereiche untersucht. Sowohl Hoch- als auch Tieftemperaturskalen werden berechnet.
Tensor surgery and tensor rank
Creators: name: Christandl, Matthias
name: Zuiddam, Jeroen
Publisher: name: arXiv
Year: 2016
Subjects: subject: Combinatorics (math.CO)
subject: Computational Complexity (cs.CC)
subject: Quantum Physics (quant-ph)
subject: FOS: Mathematics
subject: FOS: Computer and information sciences
subject: FOS: Physical sciences
subject: 05C65, 68Q17, 68Q12, 15A69, 81P45

description: We introduce a method for transforming low-order tensors into higher-order tensors and apply it to tensors defined by graphs and hypergraphs. The transformation proceeds according to a surgery-like procedure that splits vertices, creates and absorbs virtual edges and inserts new vertices and edges. We show that tensor surgery is capable of preserving the low rank structure of an initial tensor decomposition and thus allows to prove nontrivial upper bounds on tensor rank, border rank and asymptotic rank of the final tensors. We illustrate our method with a number of examples. Tensor surgery on the triangle graph, which corresponds to the matrix multiplication tensor, leads to nontrivial rank upper bounds for all odd cycle graphs, which correspond to the tensors of iterated matrix multiplication. In the asymptotic setting we obtain upper bounds in terms of the matrix multiplication exponent $ω$ and the rectangular matrix multiplication parameter $α$. These bounds are optimal if $ω$ equals two. We also give examples that illustrate that tensor surgery on general graphs might involve the absorption of virtual hyperedges and we provide an example of tensor surgery on a hypergraph. Besides its relevance in algebraic complexity theory, our work has applications in quantum information theory and communication complexity.
description: (accepted for publication in Comm. Complexity)
title: Gesellschaftliche Wirkungen in transdisziplinärer Stadtforschung fördern. Zehn Thesen auf Basis einer begleitenden Wirkungsforschung zur nachhaltigen Zukunftsstadt
title: Werkstattbericht des Verbundvorhabens "Synthese- und Vernetzungsprojekt Zukunftsstadt (SynVer*Z)"
titleType: Subtitle
Creators: name: Kreß-Ludwig, Michael
name: Marg, Oskar
name: Lux, Alexandra
Publisher: name: Zenodo
Year: 2023

description: Der vorliegende Werkstattbericht fasst die Erkenntnisse aus mehreren Fallstudien zur Generierung von Wirkungen in transdisziplinären Stadtforschungsprojekten im Rahmen des Projekts SynVerZ zusammen. In fünf Themenfeldern und zehn Thesen werden verallgemeinerte Aussagen über Methoden und Vorgehensweisen zur Generierung und zur Unterstützung von gesellschaftlichen Wirkungen in den Zukunftsstadt-Projekten getroffen.
Cross section line shape of $e^+e^-\toχ_{c0}ω$ around the $Y(4260)$ mass region
Creators: name: Cleven, Martin
name: Zhao, Qiang
Publisher: name: arXiv
Year: 2016
Subjects: subject: High Energy Physics - Phenomenology (hep-ph)
subject: High Energy Physics - Experiment (hep-ex)
subject: Nuclear Theory (nucl-th)
subject: FOS: Physical sciences

description: We demonstrate that the recent measurement of the cross section line shapes of $e^+e^-\to χ_{c0}ω$ can be naturally explained by the molecular picture for $Y(4260)$ where the $Y(4260)$ is treated as a hadronic molecule dominated by $\bar{D}D_1(2420)+c.c.$ This result is consistent with properties extracted for $Y(4260)$ as the $\bar{D}D_1(2420)+c.c.$ molecular state in other reactions such as $e^+e^-\to J/ψππ$, $h_cππ$, $\bar D D^*π+c.c.$, and $γX(3872)$.
description: 6 pages, 2 Figures
ELEMENTS OF PATHS, EDGES, NODES, DISTRICTS AND LANDMARKS IN FISHING VILLAGE WATERFRONT, GEORGE TOWN, PENANG
Creators: name: Lee Han Lin, Jestin Nordin
Publisher: name: TuEngr Group
Year: 2019
Subjects: Urban design elements
Historical characters
Lynch's elements
Traditional fishing villages
Traditional houses
Sustainable urban development.

description: International Transaction Journal of Engineering, Management, & Applied Sciences & Technologies, 10, 18, 10A18E: 1-14
Synchronization dynamics on the picosecond timescale in coupled Josephson junction neurons
Creators: name: Segall, Ken
name: LeGro, Matthew
name: Kaplan, Steven
name: Svitelskiy, Oleksiy
name: Khadka, Shreeya
name: Crotty, Patrick
name: Schult, Daniel
Publisher: name: arXiv
Year: 2016
Subjects: subject: Neurons and Cognition (q-bio.NC)
subject: Disordered Systems and Neural Networks (cond-mat.dis-nn)
subject: Emerging Technologies (cs.ET)
subject: Biological Physics (physics.bio-ph)
subject: FOS: Biological sciences
subject: FOS: Physical sciences
subject: FOS: Computer and information sciences

description: Conventional digital computation is rapidly approaching physical limits for speed and energy dissipation. Here we fabricate and test a simple neuromorphic circuit that models neuronal somas, axons and synapses with superconducting Josephson junctions. The circuit models two mutually coupled excitatory neurons. In some regions of parameter space the neurons are desynchronized. In others, the Josephson neurons synchronize in one of two states, in-phase or anti-phase. An experimental alteration of the delay and strength of the connecting synapses can toggle the system back and forth in a phase-flip bifurcation. Firing synchronization states are calculated >70,000 times faster than conventional digital approaches. With their speed and low energy dissipation (10-17 Joules/spike), this set of proof-of- concept experiments establishes Josephson junction neurons as a viable approach for improvements in neuronal computation as well as applications in neuromorphic computing.
description: 13 pages, 8 figures
Entwicklung und Evaluation von Lernzyklen zum Thema Maßgeschneiderte Polymere im Rahmen der Konzeption Chemie im Kontext
Creators: name: Köhler-Krützfeldt, Angela
Publisher: name: Universität Dortmund
Year: 2001
Subjects: subject: learning cycle
subject: Chemie in context
subject: superabsorbent polymers
subject: conducting polymers
subject: Evaluation
subject: Lernzyklus
subject: Chemie im Kontext
subject: Superabsorbierende Polymere
subject: Leitfähige Polymere
subject: 540

description: Ausgehend von der aktuellen Situation des Chemieunterrichts, die von geringem Interesse seitens der Schüler und Schülerinnen geprägt ist, werden die Struktur des von Parchmann und Ralle entwickelten Curriculums 'Chemie im Kontext' sowie relevante lerntheoretische Hintergründe erläutert. Diese Kontexte sind als vierphasige Lernzyklen mit Begegnungs- und Neugierphase, Erarbeitungs- sowie Vertiefungs- bzw. Vernetzungsphase konzipiert. Nach diesem Schema werden zwei Lernzyklen zu superabsorbierenden und zu leitfähigen Polymeren entwickelt sowie die dazu benötigten Unterrichtsmaterialien einschließlich der entwickelten Experimente erläutert.Die praktische Umsetzbarkeit des Lernzyklusses zu superabsorbierenden Polymeren wird in mehreren Schülergruppen durch Kombination von quantitativen und qualitativen Methoden evaluiert. Unterrichtsbeobachtungen, Fragebogenerhebungen und Gruppendiskussionen ergeben, dass ein in Alltagskontexten verankerter Unterricht mit vielfältigen Methoden und einem hohen Maß an Eigentätigkeit von den Schüler und Schülerinnen als besonders interessant und motivierend angesehen wird. Die entwickelten Experimente werden in Bezug auf Routineaspekte, Wahrnehmungsaspekte und Handlungsaspekte untersucht und für schultauglich befunden.
(200418) William Cecil Howard Snell
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.
Catalytic N-demethylation of alkaloids with an Feᴵᴵᴵ-TAML macrocycle and syntheses towards new TAML analogues
Creators: name: Do Pham, Duy Dinh
Publisher: name: Monash University
Year: 2017
Subjects: Uncategorized

description: The N-demethylation of specific tropane and opiate alkaloids enables the synthesis of various medicines. This thesis investigates the use of an iron(III) tetraamido macrocycle (Feᴵᴵᴵ-TAML) as a catalyst for the oxidative N-demethylation of tropane and opiate alkaloids with hydrogen peroxide as a green oxidant. The syntheses of new tetraamide macrocycles are also reported. Initial investigations examined the oxidative N-demethylation of tropane alkaloids to their nortropane derivatives with H₂O₂. After screening various reaction conditions with atropine, the optimised conditions were applied to preparative N-demethylation of atropine and scopolamine to noratropine and norscopolamine, respectively, in high conversion and good yields in a simple one-pot process without any chromatography. Some by-products were tentatively identified and putative N-demethylation reaction pathways were proposed. Further investigations conclusively identified N-formyl-noratropine and carbon-hydroxylated tropane derivatives as by-products of the catalytic reaction with atropine. Additional studies indicated that Feᴵᴵᴵ-TAML catalyses the oxidative N-demethylation of atropine to noratropine via a biomimetic pathway involving the formation and then decomposition of a N-hydroxymethyl-noratropine intermediate. Factors such as substrate concentration, alcohol co-solvent and oxidant structure, rate of oxidant addition and concentration of water were found to influence the selectivity of N-demethylation vs. N-methyl oxidation to N-formyl-noratropine, whereas temperature mainly affected conversion efficiency. It was found that Feᴵᴵᴵ-TAML also catalysed the N-demethylation of the opiate alkaloids thebaine and oxycodone but with much less selectivity. A set of new tetraamide macrocycles were synthesized to enable future studies on the effect of Feᴵᴵᴵ-TAML structure on reaction selectivity with tropane and opiate alkaloids. These syntheses were achieved by preparing the requisite malonyl dichloride precursors which were then cyclized with a common diamide diamine precursor. Bond rotation and ring inversion were observed for two of these macrocycles on the N.M.R. timescale and their associated thermodynamic activation parameters were measured. These studies showed that the activation energy for bond rotation of geminal substituents is predominantly influenced by the macrocycle ring structure rather than substituent size, while the activation energy for ring inversion is significantly influenced by substituent size. In addition, ring inversion appears to proceed via a more-ordered transition state, suggesting an associative solvent-mediated process.
The role of mode conversion in solar active region oscillations
Creators: name: Hansen, Shelley Candice
Publisher: name: Monash University
Year: 2017
Subjects: Uncategorized

description: This thesis is concerned with conversion between the various magnetohydrodynamic wave modes occurring in magnetic structures that dapple the Sun's surface and fill its atmosphere. We pay particular attention to fast-to-slow conversion which takes place where the sound and Alfvén speeds coincide, and show that fast-to-Alfvén conversion can also transpire in three-dimensional structures near where the fast wave reflects. Implications are explored for various model atmospheres. Specifically, exact two-dimensional isothermal solutions are found to confirm previous ray-theoretic modelling, and provide useful insights on the ability of flare waves in the high atmosphere to penetrate the magnetic canopy and reach the photosphere, proffering a possible mechanism for exciting sunquakes. In the real Sun, and more realistic models, regions of strong inclined magnetic field act as `magnetic portals' allowing otherwise trapped acoustic waves to propagate into the solar atmosphere. At the point where these fast waves necessarily suffer reflection due to the exponentially increasing Alfvén speed, coupling with Alfvén waves can see them transmit through the transition region and into the solar corona. We explore the conditions that make this journey possible by following the fast wave as it impinges on the magnetoacoustic conversion layer, until incidence on the transition region. The fast-to-Alfvén mode conversion is quantified in a cold plasma and a more realistic warm plasma, both with an appended transition region. The phase of the partially reflected fast wave is altered by the mode conversion process, with profound implications for Time-Distance helioseismology. This is explored quantitatively with and without a transition region.
Darstellung und Immobilisierung von neuartigen Rutheniumcarbenkomplexen
Creators: name: Prühs, Stefan
Publisher: name: Universität Dortmund
Year: 2004
Subjects: subject: Olefin-Metathese
subject: Immobilisierung
subject: NHC-Liganden
subject: 540

description: Rutheniumkomplexe mit nukleophilen heterozyklischen Carbenliganden (NHC's) zählen zu den am häufigsten verwendeten Katalysatoren für die Olefinmetathese. Im Rahmen der vorliegenden Arbeit wurden Ruthenium-Komplexe mit OH-funktionalisierter Seitenkette dargestellt und eine vorher unbekannte trans-cis-Isomerisierung dieser Verbindungen untersucht. Ferner gelang eine effiziente Immobilisierung dieser Verbindungen über den NHC-Liganden auf verschiedensten Trägermaterialien wie z. B. Kieselgel.
Rigorous derivation of nonlinear Dirac equations for wave propagation in honeycomb structures
Creators: name: Arbunich, Jack
name: Sparber, Christof
Publisher: name: arXiv
Year: 2016
Subjects: subject: Mathematical Physics (math-ph)
subject: Analysis of PDEs (math.AP)
subject: FOS: Physical sciences
subject: FOS: Mathematics
subject: 35Q41, 35C20

description: We consider a nonlinear Schroedinger equation in two spatial dimensions subject to a periodic honeycomb lattice potential. Using a multi-scale expansion together with rigorous error estimates, we derive an effective model of nonlinear Dirac type. The latter describes the propagation of slowly modulated, weakly nonlinear waves spectrally localized near a Dirac point.
description: 19 pages. Updated references and minor revisions
title: Wirkungen transdisziplinärer Stadtforschung in den Projekten der Förderlinien 'Leitinitiative Zukunftsstadt' und 'Nachhaltige Transformation urbaner Räume'. Wirkungskategorien, Projektprofile und Handreichung zur Selbstreflexion"
title: Werkstattbericht des Verbundvorhabens "Synthese- und Vernetzungsprojekt Zukunftsstadt (SynVer*Z)"
titleType: Subtitle
Creators: name: Marg, Oskar
name: Kreß-Ludwig, Michael
name: Lux, Alexandra
Publisher: name: Zenodo
Year: 2019

description: Der vorliegende Werkstattbericht fasst erste Erkenntnisse aus der Wirkungsanalyse der im Rahmendes Projekts SynVer*Z begleiteten Projekte zusammen (Teil A), gibt den einzelnen Projekten eineindividuelle Rückmeldung zur Einordnung ihrer angestrebten Wirkungen (Teil B - hier anhand eines fiktiven Projektbeispiels) und bietet ein Toolzur Selbstreflexion von Wirkungen und dem Aufbau von Wirkungspotenzialen an (Teil C).
Rift Valley Bibliography: An introduction
Creators: name: Griscom, Richard
name: Harvey, Andrew
name: Coburn, Jeremy
Publisher: name: Zenodo
Year: 2019
Subjects: Languages of Tanzania
Tanzanian Rift Valley Area
Bibliography
Zenodo

description: The Rift Valley Bibliography is an open access digital bibliography of publications related to the languages of the Tanzanian Rift Valley Area (Kießling et al. 2008) and associated speech communities. Version 1.0 of the bibliography includes over 400 entries and is accompanied by a collection of PDF files that is available exclusively for members of the Rift Valley Network. During this introduction to the bibliography, we describe its contents and structure, suggest various ways that it can be used, and explain how members of the Rift Valley Network can contribute to future releases.
description: Note: This talk has not gone through a process of peer review, and findings should therefore be treated as preliminary and subject to change. Acknowledgement and citation: Griscom, Richard, Andrew Harvey, and Jeremy Coburn. 2019. Rift Valley Bibliography: An introduction. Talk given at the Rift Valley Network Webinar Series. 10/07/2019.
Recursive nearest agglomeration (ReNA): fast clustering for approximation of structured signals
Creators: name: Hoyos-Idrobo, Andrés
name: Varoquaux, Gaël
name: Kahn, Jonas
name: Thirion, Bertrand
Publisher: name: arXiv
Year: 2016
Subjects: subject: Machine Learning (stat.ML)
subject: Machine Learning (cs.LG)
subject: FOS: Computer and information sciences

description: In this work, we revisit fast dimension reduction approaches, as with random projections and random sampling. Our goal is to summarize the data to decrease computational costs and memory footprint of subsequent analysis. Such dimension reduction can be very efficient when the signals of interest have a strong structure, such as with images. We focus on this setting and investigate feature clustering schemes for data reductions that capture this structure. An impediment to fast dimension reduction is that good clustering comes with large algorithmic costs. We address it by contributing a linear-time agglomerative clustering scheme, Recursive Nearest Agglomeration (ReNA). Unlike existing fast agglomerative schemes, it avoids the creation of giant clusters. We empirically validate that it approximates the data as well as traditional variance-minimizing clustering schemes that have a quadratic complexity. In addition, we analyze signal approximation with feature clustering and show that it can remove noise, improving subsequent analysis steps. As a consequence, data reduction by clustering features with ReNA yields very fast and accurate models, enabling to process large datasets on budget. Our theoretical analysis is backed by extensive experiments on publicly-available data that illustrate the computation efficiency and the denoising properties of the resulting dimension reduction scheme.
description: IEEE Transactions on Pattern Analysis and Machine Intelligence, Institute of Electrical and Electronics Engineers, In press
(200410) Philip Capon
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.
BMS Particles in Three Dimensions
Creators: name: Oblak, Blagoje
Publisher: name: arXiv
Year: 2016
Subjects: subject: High Energy Physics - Theory (hep-th)
subject: General Relativity and Quantum Cosmology (gr-qc)
subject: Mathematical Physics (math-ph)
subject: Group Theory (math.GR)
subject: Representation Theory (math.RT)
subject: FOS: Physical sciences
subject: FOS: Mathematics

description: This thesis is devoted to the group-theoretic aspects of three-dimensional quantum gravity on Anti-de Sitter and Minkowskian backgrounds. In particular we describe the relation between unitary representations of asymptotic symmetry groups and gravitational perturbations around a space-time metric. In the asymptotically flat case this leads to "BMS particles", representing standard relativistic particles dressed with gravitational degrees of freedom accounted for by coadjoint orbits of the Virasoro group. Their thermodynamics are described by BMS characters, which coincide with gravitational one-loop partition functions. We also extend these considerations to higher-spin theories and supergravity.
description: 437 pages (including index), 33 figures. Appendix reproduced from arXiv:1512.03353 [hep-th]. v2: minor typos corrected; published in Springer Theses
"Hey bonikalaa": language contact and experiences of Swahili among rural Datooga children
Creators: name: Mitchell, Alice
Publisher: name: Zenodo
Year: 2019
Subjects: Languages of Tanzania
Tanzanian Rift Valley Area
Datooga
Swahili
Language contact
Child language

description: This talk explores Datooga-speaking children's knowledge, use, and experience of Swahili in a pastoral village in the Yaeda Valley.
description: Note: This talk has not gone through a process of peer review, and findings should therefore be treated as preliminary and subject to change. Acknowledgement and citation: Mitchell, Alice. 2019. "Hey bonikalaa": language contact and experiences of Swahili among rural Datooga children. Talk given at the Rift Valley Network Webinar Series. 15/05/2019.
Type Ibn Supernovae Show Photometric Homogeneity and Spectral Diversity at Maximum Light
Creators: name: Hosseinzadeh, Griffin
name: Arcavi, Iair
name: Valenti, Stefano
name: McCully, Curtis
name: Howell, D. Andrew
name: Johansson, Joel
name: Sollerman, Jesper
name: Pastorello, Andrea
name: Benetti, Stefano
name: Cao, Yi
name: Cenko, S. Bradley
name: Clubb, Kelsey
name: Corsi, Alessandra
name: Duggan, Gina
name: Elias-Rosa, Nancy
name: Filippenko, Alexei V.
name: Fox, Ori D.
name: Fremling, Christoffer
name: Horesh, Assaf
name: Karamehmetoglu, Emir
name: Kasliwal, Mansi
name: Marion, G. H.
name: Ofek, Eran
name: Sand, David
name: Taddia, Francesco
name: Zheng, WeiKang
name: Fraser, Morgan
name: Gal-Yam, Avishay
name: Inserra, Cosimo
name: Laher, Russ
name: Masci, Frank
name: Rebbapragada, Umaa
name: Smartt, Stephen
name: Smith, Ken W.
name: Sullivan, Mark
name: Surace, Jason
name: Woźniak, Przemek
Publisher: name: arXiv
Year: 2016
Subjects: subject: High Energy Astrophysical Phenomena (astro-ph.HE)
subject: Solar and Stellar Astrophysics (astro-ph.SR)
subject: FOS: Physical sciences

description: Type Ibn supernovae (SNe) are a small yet intriguing class of explosions whose spectra are characterized by low-velocity helium emission lines with little to no evidence for hydrogen. The prevailing theory has been that these are the core-collapse explosions of very massive stars embedded in helium-rich circumstellar material (CSM). We report optical observations of six new SNe Ibn: PTF11rfh, PTF12ldy, iPTF14aki, iPTF15ul, SN 2015G, and iPTF15akq. This brings the sample size of such objects in the literature to 22. We also report new data, including a near-infrared spectrum, on the Type Ibn SN 2015U. In order to characterize the class as a whole, we analyze the photometric and spectroscopic properties of the full Type Ibn sample. We find that, despite the expectation that CSM interaction would generate a heterogeneous set of light curves, as seen in SNe IIn, most Type Ibn light curves are quite similar in shape, declining at rates around 0.1 mag/day during the first month after maximum light, with a few significant exceptions. Early spectra of SNe Ibn come in at least two varieties, one that shows narrow P Cygni lines and another dominated by broader emission lines, both around maximum light, which may be an indication of differences in the state of the progenitor system at the time of explosion. Alternatively, the spectral diversity could arise from viewing-angle effects or merely from a lack of early spectroscopic coverage. Together, the relative light curve homogeneity and narrow spectral features suggest that the CSM consists of a spatially confined shell of helium surrounded by a less dense extended wind.
description: updated to match published version in ApJ
E-optimal designs for second order response surface models
Creators: name: Dette, Holger
name: Grigoriev, Yuri
Publisher: name: Technische Universität Dortmund
Year: 2014
Subjects: subject: response surface models
subject: nonlinear Chebyshev approximation
subject: extremal polynomial
subject: E-optimality
subject: optimal designs
subject: duality
subject: 310
subject: 330
subject: 620

description: E-optimal experimental designs for a second order response surface model with k>=1 predictors are investigated. If the design space is the k-dimensional unit cube, Galil and Kiefer (1977a) determined optimal designs in a restricted class of designs (defined by the multiplicity of the minimal eigenvalue) and stated their universal optimality as a conjecture. In this paper we prove this claim and show that these designs are in fact E-optimal in the class of all approximate designs. Morever, if the design space is the unit ball, E-optimal designs have not been found so far and we also provide a complete solution to this optimal design problem. The main difficulty in the construction of E-optimal designs for the second order response surface model consists in the fact that for the multiplicity of the minimum eigenvalue of the optimal information matrix" is larger than one (in contrast to the case k = 1) and as a consequence the corresponding optimality criterion is not differentiable at the optimal solution. These difficulties are solved by considering nonlinear Chebyshev approximation problems, which arise form a corresponding equivalence theorem. The extremal polynomials which solve these Chebyshev problems are constructed explicitly leading to a complete solution of the corresponding E-optimal design problems.
description: Discussion Paper / SFB 823;7/2014
Quotients of orders in algebras obtained from skew polynomials with applications to coding theory
Creators: name: Pumpluen, Susanne
Publisher: name: arXiv
Year: 2016
Subjects: subject: Rings and Algebras (math.RA)
subject: FOS: Mathematics
subject: 17A35, 11T71, 94B40, 94B05

description: We describe families of nonassociative finite unital rings that occur as quotients of natural nonassociative orders in generalized nonassociative cyclic division algebras over number fields. These natural orders have already been used to systematically construct fully diverse fast-decodable space-time block codes. We show how the quotients of natural orders can be employed for coset coding. Previous results by Oggier and Sethuraman involving quotients of orders in associative cyclic division algebras are obtained as special cases.
description: The title changed from "Quotients of orders in algebras obtained from skew polynomials and possible applications" to "Quotients of orders in algebras obtained from skew polynomials with applications to coding theory". This version contains some minor corrections of the previous one, mostly typos
Maa Varieties from Central Kenya to Southern Tanzania
Creators: name: Payne, Doris
Publisher: name: Zenodo
Year: 2019
Subjects: Languages of Tanzania
Languages of Kenya
Tanzanian Rift Valley Area
Maa
Maasai
Samburu
Chamus
Arusha
Arusa
Parakuyo

description: This talk comments on historical documentation and modern distribution of Maa varieties (Samburu, Chamus, Maasai, Arusha/Arusa, Parakuyo, etc.) that extend from Kenya to Southern Tanzania, and highlights some of the salient known differences across the varieties.
description: Note: This talk has not gone through a process of peer review, and findings should therefore be treated as preliminary and subject to change. Acknowledgement and citation: Payne, Doris. 2019. Maa varieties from Central Kenya to Southern Tanzania. Talk given at the Rift Valley Webinar Series. 17/04/2019.
Heme oxygenase effect on mesenchymal stem cells action on experimental Alzheimer's disease
Creators: name: Abdel Aziz, M. T.
name: Atta, H. M.
name: Samer, H.
name: Ahmed, H. H.
name: Rashed, L. A.
name: Sabry, D.
name: Abdel Raouf, E. R.
name: ALKaffas, M. A.
Publisher: name: Technische Universität Dortmund
Year: 2013
Subjects: subject: Alzheimer's disease
subject: stem cell
subject: heme oxygenase
subject: 610

description: The objective is to evaluate the effect of heme oxygenase-1 (HO-1) enzyme inducer and inhibitor on Mesenchymal Stem Cells (MSCs) in Alzheimer disease. Materials and Methods: 70 female albino rats were divided equally into 7 groups as follows: group 1: healthy control; group 2: Aluminium chloride induced Alzheimer disease; group 3: induced Alzheimer rats that received intravenous injection of MSCs; group 4: induced Alzheimer rats that received MSCs and HO inducer cobalt protoporphyrin; group 5: induced Alzheimer rats that received MSCs and HO inhibitor zinc protoporphyrin; group 6: induced Alzheimer rats that received HO inducer; group7: induced Alzheimer rats that received HO inhibitor. Brain tissue was collected for HO-1, seladin-1 gene expression by real time polymerase chain reaction, heme oxygenase activity, cholesterol estimation and histopathological examination. Results: MSCs decreased the plaque lesions, heme oxygenase induction with stem cells also decreased plaque lesions however there was hemorrhage in the brain. Both heme oxygenase inducer alone or with stem cells increased seladin-1 expression and decreased cholesterol level. Conclusion: MSCs alone or with HO-1 induction exert a therapeutic effect against the brain lesion in Alzheimer’s disease possibly through decreasing the brain cholesterol level and increasing seladin-1 gene expression.
description: EXCLI Journal ; Vol. 12, 2013
DIGITAL AUDIT AS A FACTOR OF BUSINESS EFFICIENCY
Creators: name: Nikita Vladimirovich Rahmatullin, Gulshat Talgatovna Guzelbaeva
Publisher: name: TuEngr Group
Year: 2019
Subjects: IT-Audit
eAudit
Financial Statements
Market Economy
Audit Services
Auditing Activity
Macroeconomics
Russian business audit.

description: International Transaction Journal of Engineering, Management, & Applied Sciences & Technologies, 10, 18, 10A18F: 1-9
Linguistic diversity among the Datooga
Creators: name: Griscom, Richard
Publisher: name: Zenodo
Year: 2019
Subjects: Languages of Tanzania
Tanzanian Rift Valley Area
Datooga
Asimjeeg
Language variation

description: This presentation provides a brief overview of literature and new research on language variation among Datooga-speaking communities, with a special focus on the Asimjeeg (Isimjega) variety.
description: Note: This talk has not gone through a process of peer review, and findings should therefore be treated as preliminary and subject to change. Acknowledgement and citation: Griscom, Richard. 2019. Linguistic diversity among the Datooga. Talk given at the Rift Valley Webinar Series. 01/05/2019.
(200411) Julia Bunting
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.
What planetary nebulae can tell us about jets in core collapse supernovae
Creators: name: Bear, Ealeal
name: Soker, Noam
Publisher: name: arXiv
Year: 2016
Subjects: subject: Solar and Stellar Astrophysics (astro-ph.SR)
subject: High Energy Astrophysical Phenomena (astro-ph.HE)
subject: FOS: Physical sciences

description: We compare the morphology of the core collapse supernova remnant (CCSNR) W49B with the morphology of many planetary nebulae (PNe), and deduce the orientation of the jets that shaped this CCSNR and estimate their energy. We find morphological features that are shared by some PNe and by the CCSNR W49B. In PNe these features, such as a barrel-shaped main body, are thought to be shaped by jets. We use these morphological similarities to deduce that the jets that shaped SNR W49B were launched along the symmetry axis of the `barrel', and to speculate that this CCSNR has two opposite lobes (or ears), that are too faint to be observed. We crudely estimate that the jets that shaped the CCSNR into a barrel shape had a kinetic energy that amounts to about one quarter to one third of the energy of the entire CCSNR. The morphological similarities strengthen the suggestion that jets play a central role in the explosion of massive stars.
description: Accepted by MNRAS
Embelia ribes extract reduces high fat diet and low dose streptozotocin-induced diabetic nephrotoxicity in rats
Creators: name: Chaudhari, Hemantkumar Somabhai
name: Bhandari, Uma
name: Khanna, Geetika
Publisher: name: Technische Universität Dortmund
Year: 2013
Subjects: subject: type 2 diabetes
subject: nephropathy
subject: creatinine
subject: streptozotocin
subject: insulin
subject: high fat diet
subject: 610

description: Nephropathy associated with type 2 diabetes is the single most common cause of end-stage renal disease. The aim of the present study was to evaluate the preventive effect of ethanolic extract of Embelia ribes fruit (EER) against high fat diet (HFD) and low dose streptozotocin (STZ)-induced diabetic nephrotoxicity in Wistar rats. HFD-fed and low dose STZ (35 mg/kg, i.p)-induced diabetic rats were treated with EER (100 and 200 mg/kg/day) for 21 days while continuing on HFD. Preventive effects of EER were demonstrated by significant reduction (p< 0.01) in body weight gain, fasting blood glucose, blood pressure, serum lactate dehydrogenase (LDH), creatinine, alkaline phosphatase (ALP), total cholesterol and triglyceride levels, while elevation in serum albumin and total protein levels. Insulin sensitizing effects were seen during oral glucose tolerance testing. Further, EER treatment significantly (p< 0.01) decreased the kidney thiobarbituric acid-reactive substance (TBARS) levels, while increasing the superoxide dismutase (SOD), catalase (CAT) and glutathione (GSH) levels in diabetic rats. Histological studies of kidney also supported the experimental findings. Taken together, our data suggest that EER attenuates renal injury in type 2 diabetic rats, possibly by improvement in glucose and lipid metabolism, enhancement of insulin sensitivity, blood pressure lowering, and inhibition of lipid peroxidation process.
description: EXCLI Journal ; Vol. 12, 2013
Evidence for Intervalence Band Coherences in Semiconductor Quantum Wells via Coherently Coupled Optical Stark Shifts
Creators: name: Blanche, P.-A.
name: Donovan, M. E.
name: Lee, J.
name: Peyghambarian, N.
name: Schülzgen, A.
Publisher: name: The American Physical Society
Year: 2001
Subjects: subject: 530

description: Physical Review Letters
Asymmetric studies towards the synthesis of trifluoromethyl isostatine and salvinorin A
Creators: name: Horsfall, Luke
Publisher: name: Monash University
Year: 2017
Subjects: Uncategorized

description: This thesis which is written in traditional format, contains synthetic strategies for the asymmetric total synthesis of 2 key natural product targets. Strategies in asymmetric organic chemistry are highlighted in the contained 5 chapters; The background and general synthetic approach towards the construction of isostatines and analogues thereof, along with an asymmetric synthetic approach for the preparation of Salvinorin A.
(200412) Julia Elizabeth Mary Capon
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.
Trapping planar Brownian motion in a non circular trap
Creators: name: Schenker, Jeffrey
Publisher: name: arXiv
Year: 2016
Subjects: subject: Probability (math.PR)
subject: Mathematical Physics (math-ph)
subject: FOS: Mathematics
subject: FOS: Physical sciences

description: Brownian motion in the plane in the presence of a "trap" at which motion is stopped is studied. If the trap $T$ is a connected compact set, it is shown that the probability for planar Brownian motion to hit this set before a given time $t$ is well approximated even at short times by the probability that Brownian motion hits a disk of radius $r_T$ equal to the conformal radius of the trap $T$.
description: 18 pages, Supported by NSF Award DMS-1411411; v.2 added reference to Collet et. al. and corrected typos
(200413) Robert John Franklin Capon
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.
Information-theoretic limitations on approximate quantum cloning and broadcasting
Creators: name: Lemm, Marius
name: Wilde, Mark M.
Publisher: name: arXiv
Year: 2016
Subjects: subject: Quantum Physics (quant-ph)
subject: FOS: Physical sciences

description: We prove new quantitative limitations on any approximate simultaneous cloning or broadcasting of mixed states. The results are based on information-theoretic (entropic) considerations and generalize the well known no-cloning and no-broadcasting theorems. We also observe and exploit the fact that the universal cloning machine on the symmetric subspace of $n$ qudits and symmetrized partial trace channels are dual to each other. This duality manifests itself both in the algebraic sense of adjointness of quantum channels and in the operational sense that a universal cloning machine can be used as an approximate recovery channel for a symmetrized partial trace channel and vice versa. The duality extends to give control on the performance of generalized UQCMs on subspaces more general than the symmetric subspace. This gives a way to quantify the usefulness of a-priori information in the context of cloning. For example, we can control the performance of an antisymmetric analogue of the UQCM in recovering from the loss of $n-k$ fermionic particles.
description: 13 pages; new results on approximate cloning between general subspaces, e.g., cloning of fermions
Bridging the Cluster-to-Bulk Divide: Electron Attachment Time-of-Flight Mass Spectrometry Reveals Geometrical Shell Closings in (SF6)n Clusters (n = 2  550)
Creators: name: Ingólfsson, Oddur
name: Wodtke, Alec M.
Publisher: name: The American Physical Society
Year: 2001
Subjects: subject: 530

description: Physical Review Letters