cometadata/datacite-rtg-text-other-reclassification-records huggingface dataset:
Escapee gloss : a symphony of polymedia
Creators: name: Burke Rigo, B
Publisher: name: University Of Tasmania
Year: 2023

description: Escapee Gloss: A Symphony of Polymedia has explored the methods and meaning of polymedia processes through the composition and subsequent performance of a folio of interactive works, particularly a large seven-¬¨‚â†‚ÄövÑv™movement piece, Escapee Gloss. The creative work contained in the folio has been documented in musical and graphic scores and polymedia recordings, including my own performance as a clarinetist and polymedia artist and is contextualised and analysed in the accompanying exegesis. The feature work of the folio, Escapee Gloss, embodies a personal creative response to some old, used clarinets, irreparable and unplayable, and sundry discarded clarinet parts. It integrates these physically and emotionally into experiments with sound, art works, layering of light, reflections and manipulated art work and music in performance through multi-¬¨‚â†-channel audio and video mixing. The composition combines digitally processed clarinet sounds, live acoustic instruments (flute, Eb/Bb and bass clarinets, double bass and piano), live processed acoustic environmental sounds, props and projections. These components reinvent the disintegrated clarinets through video samples and stills of broken clarinet parts, grey pencil drawings, water footage and Japanese artwork. Escapee Gloss explores the possibilities of layering and reflections of light and texture in images and sound and deliberately referencing paint textures in the titles of the movements. The composition folio contains five other works: Hats, A Snapper is a Feast, Grainger's Bridge, A Song is Here and Blooms and Death. Each of these works present a single thematic idea which is realised in performance with acoustic and electronic art music, paintings, mixed media works on paper and wood, line drawings of notations, live interactive performance, traditional notation, improvisation and videos. In each case, polymedia processes and multi-¬¨‚â†-art forms cohere in live performance through a deliberate strategy of layering to represent the complexity and depth of the images we see and of the sounds we hear.
Effectiveness of dental students and dental hygiene students in teaching preventive dentistry to adults
Creators: name: Sharpe, Linda Evelyn
Publisher: name: University of British Columbia
Year: 2011

description: The purpose of this study was to investigate the effectiveness of dental students and dental hygiene students in their teaching of prevention. Forty new periodontal patients were randomly chosen and assigned to twenty second year hygiene students and twenty third year dental students. Three variables were investigated: (1) patients' knowledge of oral hygiene; (2) patients' practices of oral hygiene as assessed by a questionnaire administered before and after initial preventive treatment and again at a six-month recall appointment; and (3) patients' plaque index as recorded by students performing a visual check on oral cleanliness. In addition, the student's attitude toward his role as an educator was assessed by a questionnaire administered prior to any patient contact. The patients' responses were evaluated to determine any changes in knowledge and improvement in preventive habits over the six-month period. The plaque index was used to correlate the patient's actual oral hygiene with his reported oral hygiene practices. The results demonstrated that dental students and dental hygiene students were equally effective in the teaching of correct oral hygiene procedures. The teaching program itself was effective in that all patients showed a significant improvement in their oral health by the end of the study. The results of the student questionnaire showed that the hygienists did feel that the task of teaching was more important than did the dental students although both groups responded favourably in their attitudes toward teaching prevention. The plaque index at follow-up was most influenced by pre-test knowledge score and by habits at the conclusion of the initial treatment period. Such socio-economic characteristics as age and educational level had little influence on the adoption of correct oral hygiene practices.
Constructive approach to the monotone rearrangement of functions
Creators: name: Barbarino, Giovanni
name: Bianchi, Davide
name: Garoni, Carlo
Publisher: name: arXiv
Year: 2021
Subjects: subject: Numerical Analysis (math.NA)
subject: FOS: Mathematics
subject: 28A20, 46E30, 60E05

description: We detail a simple procedure (easily convertible to an algorithm) for constructing from quasi-uniform samples of $f$ a sequence of linear spline functions converging to the monotone rearrangement of $f$, in the case where $f$ is an almost everywhere continuous function defined on a bounded set $Ω$ with negligible boundary. Under additional assumptions on $f$ and $Ω$, we prove that the convergence of the sequence is uniform. We also show that the same procedure applies to arbitrary measurable functions too, but with the substantial difference that in this case the procedure has only a theoretical interest and cannot be converted to an algorithm.
description: In Press
Scaling and universality in coupled driven diffusive models
Creators: name: Basu, Abhik
name: Frey, Erwin
Publisher: name: arXiv
Year: 2009
Subjects: subject: Statistical Mechanics (cond-mat.stat-mech)
subject: FOS: Physical sciences

description: Inspired by the physics of magnetohydrodynamics (MHD) a simplified coupled Burgers-like model in one dimension (1d), a generalization of the Burgers model to coupled degrees of freedom, is proposed to describe 1dMHD. In addition to MHD, this model serves as a 1d reduced model for driven binary fluid mixtures. Here we have performed a comprehensive study of the universal properties of the generalized d-dimensional version of the reduced model. We employ both analytical and numerical approaches. In particular, we determine the scaling exponents and the amplitude-ratios of the relevant two-point time-dependent correlation functions in the model. We demonstrate that these quantities vary continuously with the amplitude of the noise cross-correlation. Further our numerical studies corroborate the continuous dependence of long wavelength and long time-scale physics of the model on the amplitude of the noise cross-correlations, as found in our analytical studies. We construct and simulate lattice-gas models of coupled degrees of freedom in 1d, belonging to the universality class of our coupled Burgers-like model, which display similar behavior. We use a variety of numerical (Monte-Carlo and Pseudospectral methods) and analytical (Dynamic Renormalization Group, Self-Consistent Mode-Coupling Theory and Functional Renormalization Group) approaches for our work. The results from our different approaches complement one another. Possible realizations of our results in various nonequilibrium models are discussed.
description: To appear in JSTAT (2009); 52 pages in JSTAT format. Some figure files have been replaced
Nucleon-Nucleon Interactions from the Quark Model
Creators: name: Downum, Clark
name: Stone, Jirina
name: Barnes, Ted
name: Swanson, Eric
name: Vidana, Isaac
Publisher: name: arXiv
Year: 2010
Subjects: subject: Nuclear Theory (nucl-th)
subject: FOS: Physical sciences

description: We report on investigations of the applicability of non-relativistic constituent quark models to the low-energy nucleon-nucleon (NN) interaction. The major innovations of a resulting NN potential are the use of the $^3$P$_0$ decay model and quark model wave functions to derive nucleon-nucleon-meson form-factors, and the use of a colored spin-spin contact hyperfine interaction to model the repulsive core rather than the phenomenological treatment common in other NN potentials. We present the results of the model for experimental free NN scattering phase shifts, S-wave scattering lengths and effective ranges and deuteron properties. Plans for future study are discussed.
description: 5 pages, 4 figures, 2 tables. To appear in Proceedings of XIII International Conference on Hadron Spectroscopy, November 29 - December 4, 2009, Florida State University
A Stochastic Surveillance Stackelberg Game: Co-Optimizing Defense Placement and Patrol Strategy
Creators: name: John, Yohan
name: Diaz-Garcia, Gilberto
name: Duan, Xiaoming
name: Marden, Jason R.
name: Bullo, Francesco
Publisher: name: arXiv
Year: 2023
Subjects: subject: Systems and Control (eess.SY)
subject: Computer Science and Game Theory (cs.GT)
subject: Optimization and Control (math.OC)
subject: FOS: Electrical engineering, electronic engineering, information engineering
subject: FOS: Computer and information sciences
subject: FOS: Mathematics

description: Stochastic patrol routing is known to be advantageous in adversarial settings; however, the optimal choice of stochastic routing strategy is dependent on a model of the adversary. We adopt a worst-case omniscient adversary model from the literature and extend the formulation to accommodate heterogeneous defenses at the various nodes of the graph. Introducing this heterogeneity leads to interesting new patrol strategies. We identify efficient methods for computing these strategies in certain classes of graphs. We assess the effectiveness of these strategies via comparison to an upper bound on the value of the game. Finally, we leverage the heterogeneous defense formulation to develop novel defense placement algorithms that complement the patrol strategies.
description: 9 pages, 1 figure, submitted as a technical note to the IEEE Transactions on Automatic Control. Replaced to fix inaccuracies
Spectrum of SU(2) gauge theory with two fermions in the adjoint representation
Creators: name: Hietanen, Ari
name: Rantaharju, Jarno
name: Rummukainen, Kari
name: Tuominen, Kimmo
Publisher: name: arXiv
Year: 2008
Subjects: subject: High Energy Physics - Lattice (hep-lat)
subject: FOS: Physical sciences

description: We present preliminary results of lattice simulations of SU(2) gauge theory with two Wilson fermions in the adjoint representation. This theory has recently attracted considerable attention because it might possess an infrared fixed point (or an almost-fixed-point), and hence be a candidate for a walking technicolor theory. In this work we study the particle spectrum of the theory, and compare it with more familiar spectrum of the theory with SU(2) gauge fields and two flavors of fundamental representation fermions.
description: 7 pages, 4 figures, talk presented at the XXVI International Symposium on Lattice Field Theory, July 14-19, 2008, Williamsburg, Virginia, USA
On symplectic transformations
Creators: name: Springer, T A
Publisher: name: arXiv
Year: 2021
Subjects: subject: Group Theory (math.GR)
subject: FOS: Mathematics
subject: 20E45 20G15 15A21

description: This is an English translation, prepared by Wilberd van der Kallen, of the 1951 thesis by T.A. Springer. In this thesis Springer studied the classification of conjugacy classes in the symplectic group $Sp_n(K)$, where the commutative field $K$ is of characteristic different from 2. He finds that each conjugacy class is characterized by a system of invariants. These invariants are first of all -- as in the case of the general linear group -- irreducible polynomials and systems of non-negative integers, but secondly also equivalence classes of certain Hermitian forms and of certain quadratic forms. Original Dutch title: Over symplectische transformaties.
description: 25 pages. To appear in Indagationes Mathematicae. Prepared and edited by Wilberd van der Kallen
p-Wave pion production from nucleon-nucleon collisions
Creators: name: Baru, V.
name: Epelbaum, E.
name: Haidenbauer, J.
name: Hanhart, C.
name: Kudryavtsev, A. E.
name: Lensky, V.
name: Meissner, U. -G.
Publisher: name: arXiv
Year: 2009
Subjects: subject: Nuclear Theory (nucl-th)
subject: FOS: Physical sciences

description: We investigate p-wave pion production in nucleon-nucleon collisions up to next-to-next-to-leading order in chiral effective field theory. In particular, we show that it is possible to describe simultaneously the p-wave amplitudes in the $pn\to ppπ^-$, $pp\to pnπ^+$, $pp\to dπ^+$ channels by adjusting a single low-energy constant accompanying the short-range operator which is available at this order. This study provides a non-trivial test of the applicability of chiral effective field theory to reactions of the type $NN\to NNπ$.
description: 29 pages, revised version published in PRC
Dinâmicas sociográficas do emprego na Administração Pública
Creators: name: Nunes, Sara
Publisher: name: Zenodo
Year: 2023

description: Resumo:

O mercado de trabalho em Portugal tem sofrido um conjunto de mudanças estruturais que se reflete em formas de diferenciação laboral assentes sobre caraterísticas sociográficas, paralelamente influenciadas por especificidades no funcionamento dos setores de emprego, com destaque para o setor público. Pretende-se, neste estudo, olhar para as dinâmicas sociográficas e profissionais que caraterizam o emprego no setor da Administração Pública em Portugal, em particular na Administração Pública Central. Após um período de quebra e instabilidade até 2018, a estrutura da população empregada no setor da Administração Pública em Portugal tem vindo a registar uma tendência global de crescimento nos últimos cinco anos. O perfil de trabalhadores na Administração Pública Central é caraterizado pela concentração de trabalhadoras do sexo feminino, com idades acima dos 45 anos, com escolaridade superior e vínculos contratuais estáveis, predominantemente contratos por tempo indeterminado. Da análise efetuada destaca-se a clara tendência de envelhecimento dos trabalhadores da Administração Pública Central, bem como a persistência de desigualdades de género no acesso aos cargos de direção superior, questões que devem ser tidas em consideração no planeamento das políticas de emprego no setor público.

 

Abstract:

The labour market in Portugal has suffered a series of structural changes reflected in forms of labor differentiation based on sociographic characteristics, which are also influenced by specificities in the functioning of employment sectors, especially in the public sector. The aim of this report is to look at the sociographic and professional dynamics that characterize employment in the public administration sector in Portugal. After a period of decline and instability that lasted until 2018, the population structure in the Portuguese public administration sector has been reflecting an overall trend of growth over the last five years. The profile of workers in central public administration is characterized by a concentration of female workers, aged over 45 years, with higher education and stable contractual ties, predominantly fixed-term contracts. There is a clear trend towards the ageing of central public administration workers, as well as the persistence of gender inequalities in access to senior management positions, issues that should be taken into account when planning employment policies in the public sector.
Finite-size anisotropy in statistically uniform porous media
Creators: name: Koza, Zbigniew
name: Matyka, Maciej
name: Khalili, Arzhang
Publisher: name: arXiv
Year: 2009
Subjects: subject: Fluid Dynamics (physics.flu-dyn)
subject: Computational Physics (physics.comp-ph)
subject: FOS: Physical sciences

description: Anisotropy of the permeability tensor in statistically uniform porous media of sizes used in typical computer simulations is studied. Although such systems are assumed to be isotropic by default, we show that de facto their anisotropic permeability can give rise to significant changes of transport parameters such as permeability and tortuosity. The main parameter controlling the anisotropy is $a/L$, being the ratio of the obstacle to system size. Distribution of the angle $α$ between the external force and the volumetric fluid stream is found to be approximately normal, and the standard deviation of $α$ is found to decay with the system size as $(a/L)^{d/2}$, where $d$ is the space dimensionality. These properties can be used to estimate both anisotropy-related statistical errors in large-scale simulations and the size of the representative elementary volume.
description: 7 pages, 9 figures
Stability of multi antipeakon-peakons profile
Creators: name: Dika, Khaled El
name: Molinet, Luc
Publisher: name: arXiv
Year: 2009
Subjects: subject: Analysis of PDEs (math.AP)
subject: FOS: Mathematics

description: The Camassa-Holm equation possesses well-known peaked solitary waves that can travel to both directions. The positive ones travel to the right and are called peakon whereas the negative ones travel to the left and are called antipeakons. Their orbital stability has been established by Constantin and Strauss in \cite{CS1}. In \cite{EL2} we have proven the stability of trains of peakons. Here, we continue this study by extending the stability result to the case of ordered trains of anti-peakons and peakons.
Some algebraic consequences of Green's hyperplane restriction theorems
Creators: name: Boij, Mats
name: Zanello, Fabrizio
Publisher: name: arXiv
Year: 2009
Subjects: subject: Commutative Algebra (math.AC)
subject: Algebraic Geometry (math.AG)
subject: FOS: Mathematics
subject: 13H10 (Primary), 14M05 (Secondary), 13D40

description: We discuss a paper of M. Green from a new algebraic perspective, and provide applications of its results to level and Gorenstein algebras, concerning their Hilbert functions and the weak Lefschetz property. In particular, we will determine a new infinite class of symmetric $h$-vectors that cannot be Gorenstein $h$-vectors, which was left open in a recent work of Migliore-Nagel-Zanello. This includes the smallest example previously unknown, $h=(1,10,9,10,1)$. As M. Green's results depend heavily on the characteristic of the base field, so will ours. The appendix will contain a new argument, kindly provided to us by M. Green, for Theorems 3 and 4 of his paper, since we had found a gap in the original proof of those results during the preparation of this manuscript.
description: A few revisions. Final version to appear in JPAA
Foundations of a Multi-way Spectral Clustering Framework for Hybrid Linear Modeling
Creators: name: Chen, Guangliang
name: Lerman, Gilad
Publisher: name: arXiv
Year: 2008
Subjects: subject: Machine Learning (stat.ML)
subject: Metric Geometry (math.MG)
subject: FOS: Computer and information sciences
subject: FOS: Mathematics

description: The problem of Hybrid Linear Modeling (HLM) is to model and segment data using a mixture of affine subspaces. Different strategies have been proposed to solve this problem, however, rigorous analysis justifying their performance is missing. This paper suggests the Theoretical Spectral Curvature Clustering (TSCC) algorithm for solving the HLM problem, and provides careful analysis to justify it. The TSCC algorithm is practically a combination of Govindu's multi-way spectral clustering framework (CVPR 2005) and Ng et al.'s spectral clustering algorithm (NIPS 2001). The main result of this paper states that if the given data is sampled from a mixture of distributions concentrated around affine subspaces, then with high sampling probability the TSCC algorithm segments well the different underlying clusters. The goodness of clustering depends on the within-cluster errors, the between-clusters interaction, and a tuning parameter applied by TSCC. The proof also provides new insights for the analysis of Ng et al. (NIPS 2001).
description: 40 pages. Minor changes to the previous version (mainly revised Sections 2.2 & 2.3, and added references). Accepted to the Journal of Foundations of Computational Mathematics
Quantum buckling in metal-organic framework materials
Creators: name: Geilhufe, R. Matthias
Publisher: name: arXiv
Year: 2021
Subjects: subject: Mesoscale and Nanoscale Physics (cond-mat.mes-hall)
subject: Chemical Physics (physics.chem-ph)
subject: Computational Physics (physics.comp-ph)
subject: Quantum Physics (quant-ph)
subject: FOS: Physical sciences

description: Metal organic frameworks are porous materials composed of metal ions or clusters coordinated by organic molecules. As a response to applied uniaxial pressure, molecules of straight shape in the framework start to buckle. Under sufficiently low temperatures, this buckling is of quantum nature, described by a superposition of degenerate buckling states. Buckling states of adjacent molecules couple in a transverse Ising type behavior. On the example of the metal organic framework topology MOF-5 we derive the phase diagram under applied strain, showing a normal, a parabuckling, and a ferrobuckling phase. At zero temperature, quantum phase transitions between the three phases can be induced by strain. This novel type of order opens a new path towards strain induced quantum phases.
description: 5 pages, 3 figures
Coupling of a quantum memory and telecommunication wavelength photons for high-rate entanglement distribution in quantum repeaters
Creators: name: Mannami, Kyoko
name: Kondo, Takeshi
name: Tsuno, Tomoki
name: Miyashita, Takuto
name: Yoshida, Daisuke
name: Ito, Ko
name: Niizeki, Kazuya
name: Nakamura, Ippei
name: Hong, Feng-Lei
name: Horikiri, Tomoyuki
Publisher: name: arXiv
Year: 2021
Subjects: subject: Quantum Physics (quant-ph)
subject: FOS: Physical sciences

description: Quantum repeaters are indispensable tools for long-distance quantum communication. However, frequency matching between entangled photon sources and remote quantum memories (QMs) is difficult, which is an obstacle to the implementation of quantum repeaters. In this paper, we demonstrate a method to achieve the coupling of a Pr:YSO as a fixed-time QM with a single telecommunication-wavelength photon through frequency stabilization using an optical frequency comb over all applied laser wavelengths. The demonstrated method can lead to the implementation of a quantum repeater scheme enabling an improvement of the entanglement generation rate, paving the way for long-distance quantum communication.
description: 16 pages, 6 figures
Static spherically symmetric wormhole with quadratic shape function and particle trajectories around it
Creators: name: Ghosh, Bikram
name: Dutta, Sourav
name: Mukerji, Sudeshna
name: Chakraborty, Subenoy
Publisher: name: arXiv
Year: 2021
Subjects: subject: General Relativity and Quantum Cosmology (gr-qc)
subject: FOS: Physical sciences

description: The paper deals with static traversable wormhole having shape function a polynomial of the radial coordinate of degree 2. Embedding of the wormholes in space-time is examined both analytically and graphically. Also both timelike and null geodesics are studied in this wormhole geometry.
Abstract Fractional Cauchy Problem: Existence of Propagators and Inhomogeneous Solution Representation
Creators: name: Sytnyk, Dmytro
name: Wohlmuth, Barbara
Publisher: name: arXiv
Year: 2023
Subjects: subject: Numerical Analysis (math.NA)
subject: Analysis of PDEs (math.AP)
subject: Dynamical Systems (math.DS)
subject: Functional Analysis (math.FA)
subject: FOS: Mathematics
subject: 34A08, 35R11, 34G10, 35R20, 65L05, 65J08, 65J10

description: We consider a Cauchy problem for the inhomogeneous differential equation given in terms of an unbounded linear operator $A$ and the Caputo fractional derivative of order $α\in (0, 2)$ in time. The previously known representation of the mild solution to such a problem does not have a conventional variation-of-constants like form, with the propagator derived from the associated homogeneous problem. Instead, it relies on the existence of two propagators with different analytical properties. This fact limits theoretical and especially numerical applicability of the existing solution representation. Here, we propose an alternative representation of the mild solution to the given problem, that consolidates the solution formulas for sub-parabolic, parabolic and sub-hyperbolic equations with a positive sectorial operator $A$ and non-zero initial data. The new representation is solely based on the propagator of the homogeneous problem and, therefore, can be considered as a more natural fractional extension of the solution to the classical parabolic Cauchy problem. By exploiting a trade-off between the regularity assumptions on the initial data in terms of the fractional powers of $A$ and the regularity assumptions on the right-hand side in time, we show that the proposed solution formula is strongly convergent for $t \geq 0$ under considerably weaker assumptions compared to the standard results from the literature. Crucially, the achieved relaxation of space regularity assumptions ensures that the new solution representation is practically feasible for any $α\in (0, 2)$ and is amenable to the numerical evaluation using uniformly accurate quadrature-based algorithms.
description: 19 pages
Operator norm consistent estimation of large-dimensional sparse covariance matrices
Creators: name: Karoui, Noureddine El
Publisher: name: arXiv
Year: 2009
Subjects: subject: Statistics Theory (math.ST)
subject: FOS: Mathematics
subject: 62H12 (Primary)

description: Estimating covariance matrices is a problem of fundamental importance in multivariate statistics. In practice it is increasingly frequent to work with data matrices $X$ of dimension $n\times p$, where $p$ and $n$ are both large. Results from random matrix theory show very clearly that in this setting, standard estimators like the sample covariance matrix perform in general very poorly. In this "large $n$, large $p$" setting, it is sometimes the case that practitioners are willing to assume that many elements of the population covariance matrix are equal to 0, and hence this matrix is sparse. We develop an estimator to handle this situation. The estimator is shown to be consistent in operator norm, when, for instance, we have $p\asymp n$ as $n\to\infty$. In other words the largest singular value of the difference between the estimator and the population covariance matrix goes to zero. This implies consistency of all the eigenvalues and consistency of eigenspaces associated to isolated eigenvalues. We also propose a notion of sparsity for matrices, that is, "compatible" with spectral analysis and is independent of the ordering of the variables.
description: Published in at http://dx.doi.org/10.1214/07-AOS559 the Annals of Statistics (http://www.imstat.org/aos/) by the Institute of Mathematical Statistics (http://www.imstat.org)
A simple approach to the Landau-Zener formula
Creators: name: Vutha, Amar C
Publisher: name: arXiv
Year: 2010
Subjects: subject: Atomic Physics (physics.atom-ph)
subject: FOS: Physical sciences

description: The Landau-Zener formula provides the probability of non-adiabatic transitions occuring when two energy levels are swept through an avoided crossing. The formula is derived here in a simple calculation that emphasizes the physics responsible for non-adiabatic population transfer.
description: 4 pages, 2 figures; fixed typos and added a reference
Variance bounds, with an application to norm bounds for commutators
Creators: name: Audenaert, Koenraad M. R.
Publisher: name: arXiv
Year: 2009
Subjects: subject: Functional Analysis (math.FA)
subject: FOS: Mathematics
subject: 15A60

description: Murthy and Sethi (Sankhya Ser B \textbf{27}, 201--210 (1965)) gave a sharp upper bound on the variance of a real random variable in terms of the range of values of that variable. We generalise this bound to the complex case and, more importantly, to the matrix case. In doing so, we make contact with several geometrical and matrix analytical concepts, such as the numerical range, and introduce the new concept of radius of a matrix. We also give a new and simplified proof for a sharp upper bound on the Frobenius norm of commutators recently proven by Böttcher and Wenzel (Lin.\ Alg. Appl. \textbf{429} (2008) 1864--1885) and point out that at the heart of this proof lies exactly the matrix version of the variance we have introduced. As an immediate application of our variance bounds we obtain stronger versions of Böttcher and Wenzel's upper bound.
description: 26 pages, 2 handmade drawings
Density effect on multi-wavelength luminosities on star formation regions in NGC 3184 and NGC 3938
Creators: name: Caldú-Primo, A.
name: Cruz-González, I.
name: Morisset, C.
Publisher: name: arXiv
Year: 2008
Subjects: subject: Astrophysics (astro-ph)
subject: FOS: Physical sciences

description: We analyzed the regions of star formation in the spiral galaxies NGC 3184 and NGC 3938 from archive images at multiple wavelengths (NUV from GALEX, H-alpha from JKT and KPNO, 8 and 24 um from Spitzer, and CO from BIMA). We used the Clump Find Algorithm to extract the properties of the star forming tracers shown as emission regions at each wavelength. We obtained a power-law relation between the luminosity and the emission region volume that scales as expected, $L proportional to V, for the H-alpha and NUV emission; but much faster for the dust (8 and 24 um) and molecular gas emitting regions in CO. This is interpreted as a change on the emissivity with the size of the cloud, either by an augmentation of the overall density or due to the presence of high density clumps, with high local emissivity coefficients. Although the clumpy nature of molecular gas may not be surprising, the clumpy nature of mid-infrared emission regions, that could be explained by newly formed high to intermediate mass stars embedded into the dust and heating it, is clearly revealed in both galaxies.
description: 5 pages, 3 figures. Accepted for publication in Astronomy & Astrophysics. References and content added, a figure was modified for clarity
High pressure investigations on Hydrous Magnesium Silicate-Phase A using first principles calculations, H--H repulsion and O-H bond compression
Creators: name: Poswal, H. K.
name: Sharma, Surinder M
name: Sikka, S. K.
Publisher: name: arXiv
Year: 2009
Subjects: subject: Materials Science (cond-mat.mtrl-sci)
subject: Other Condensed Matter (cond-mat.other)
subject: FOS: Physical sciences

description: We have carried out first principles structural relaxation calculations on the hydrous magnesium silicate Phase A (Mg7Si2O8(OH)6) under high pressures. Our results show that phase A does not undergo any phase transition upto ~ 45 GPa. We find that non-bonded H--H distance reaches a limiting value of 1.85 angstrom at about 45 GPa. The H--H repulsive strain releasing mechanism in Phase A is found to be dramatically different from the hydrogen bond bending one that was proposed by Hofmeister et al1 for Phase B. It is based on the reduction of one of the O-H bond distances with compression.
Anyonic Quantum Walks
Creators: name: Brennen, Gavin K.
name: Ellinas, Demosthenes
name: Kendon, Viv
name: Pachos, Jiannis K.
name: Tsohantjis, Ioannis
name: Wang, Zhenghan
Publisher: name: arXiv
Year: 2009
Subjects: subject: Quantum Physics (quant-ph)
subject: FOS: Physical sciences

description: The one dimensional quantum walk of anyonic systems is presented. The anyonic walker performs braiding operations with stationary anyons of the same type ordered canonically on the line of the walk. Abelian as well as non-Abelian anyons are studied and it is shown that they have very different properties. Abelian anyonic walks demonstrate the expected quadratic quantum speedup. Non-Abelian anyonic walks are much more subtle. The exponential increase of the system's Hilbert space and the particular statistical evolution of non-Abelian anyons give a variety of new behaviors. The position distribution of the walker is related to Jones polynomials, topological invariants of the links created by the anyonic world-lines during the walk. Several examples such as the SU(2) level k and the quantum double models are considered that provide insight to the rich diffusion properties of anyons.
description: 17 pages, 10 figures
Glycogen metabolism in meal-fed pyridoxine-deficient rats
Creators: name: Mellor, Ruth Marie
Publisher: name: University of British Columbia
Year: 2011

description: Pyridoxine-deficient rats are known to exhibit little, if any, weight gain; they also have decreased fat stores in comparison with their pair-fed controls. The defect in energy metabolism responsible for this phenomenon is not well understood at present. This study was undertaken to investigate some aspects of glycogenesis and glycogenolysis in order to add to the present information on energy metabolism in the pyridoxine deficiency state. Meal-fed animals were used, in order to eliminate differences due to the mode of feeding between the experimental and the pair-fed control animals. Male weanling rats were fed a pyridoxine-deficient diet in one 2-hour daily meal, while the controls were pair-fed. This eliminated differences due to feeding frequency when these groups were compared with each other. Aspartate amino-transferase and alanine aminotransferase activities were assayed in liver and erythrocytes in order to verify the presence of a pyridoxine deficiency state under the conditions used in this laboratory. The activities of glycogen phosphorylase, the rate-limiting enxyme in glycogenolysis, and glycogen UDP-glucosyltransferase were assayed in liver and muscle. Glycogen storage in these tissues was also measured. Finally, the incorporation of labelled carbon atoms into blood glucose and liver glycogen following intraperitoneal injection of L-alanine-¹⁴C was assayed. Glycogen phosphorylase activity was reduced in pyridoxine-deficient animals. This defect was not accompanied by a concomitant increase in the deposition of glycogen. There was, therefore, the possibility of a decreased ability to form glycogen. Glycogen UDP-glucosyltransferase activity was normal in muscle and elevated in liver indicating, if anything, an unimpaired ability to synethesize glycogen from UDPG. A trend towards a lesser incorporation of labelled carbon atoms into the blood glucose by the pyridoxine-deficient group appeared when the results were expressed as a percent of administered dose per ml. This became statistically significant when the data was expressed in terms of the circulating glucose pool. Although not at a statistically significant level, there was a greater incorporation of labelled carbon atoms into the liver glycogen of the pyridoxine-deficient group. It appeared from these findings that the defect in energy metabolism in pyridoxine deficiency may be the result of a reduced availability of carbon skeletons and occurred prior to the formation of glycogen. Further study in this area is necessary to reveal the exact point at which energy loss occurred.
Comet C/2004 Q2 (MACHHOLZ): Parent Volatiles, a Search for Deuterated Methane, and Constraint on the CH4 Spin Temperature
Creators: name: Bonev, Boncho P.
name: Mumma, Michael J.
name: Gibb, Erika L.
name: Disanti, Michael A.
name: Villanueva, Geronimo L.
name: Magee-Sauer, Karen
name: Ellis, Richard S.
Publisher: name: arXiv
Year: 2009
Subjects: subject: Earth and Planetary Astrophysics (astro-ph.EP)
subject: FOS: Physical sciences

description: High-dispersion (l/dl ~ 25,000) infrared spectra of Comet C/2004 Q2 (Machholz) were acquired on Nov. 28-29, 2004, and Jan. 19, 2005 (UT dates) with NIRSPEC at the Keck-2 telescope on Mauna Kea. We detected H2O, CH4, C2H2, C2H6, CO, H2CO, CH3OH, HCN, and NH3 and we conducted a sensitive search for CH3D. We report rotational temperatures, production rates, and mixing ratios (with respect to H2O) at heliocentric distances of 1.49 AU (Nov. 2004) and 1.21 AU (Jan. 2005). We highlight three principal results: (1) The mixing ratios of parent volatiles measured at 1.49 AU and 1.21 AU agree within confidence limits, consistent with homogeneous composition in the mean volatile release from the nucleus of C/2004 Q2. Notably, the relative abundance of C2H6/C2H2 is substantially higher than those measured in other comets, while the mixing ratios C2H6/H2O, CH3OH/H2O, and HCN/H2O are similar to those observed in comets, referred to as "organics-normal". (2) The spin temperature of CH4 is > 35-38 K, an estimate consistent with the more robust spin temperature found for H2O. (3) We obtained a 3s upper limit of CH3D/CH4 < 0.020 (D/H < 0.005). This limit suggests that methane released from the nucleus of C/2004 Q2 is not dominated by a component formed in extremely cold (near 10 K) environments. Formation pathways of both interstellar and nebular origin consistent with the measured D/H in methane are discussed. Evaluating the relative contributions of these pathways requires further modeling of chemistry including both gas-phase and gas-grain processes in the natal interstellar cloud and in the protoplanetary disk.
description: Accepted by The Astrophysical Journal
Representation Learning for Sequential Volumetric Design Tasks
Creators: name: Alam, Md Ferdous
name: Wang, Yi
name: Cheng, Chin-Yi
name: Luo, Jieliang
Publisher: name: arXiv
Year: 2023
Subjects: subject: Machine Learning (cs.LG)
subject: Artificial Intelligence (cs.AI)
subject: FOS: Computer and information sciences

description: Volumetric design, also called massing design, is the first and critical step in professional building design which is sequential in nature. As the volumetric design process requires careful design decisions and iterative adjustments, the underlying sequential design process encodes valuable information for designers. Many efforts have been made to automatically generate reasonable volumetric designs, but the quality of the generated design solutions varies, and evaluating a design solution requires either a prohibitively comprehensive set of metrics or expensive human expertise. While previous approaches focused on learning only the final design instead of sequential design tasks, we propose to encode the design knowledge from a collection of expert or high-performing design sequences and extract useful representations using transformer-based models. Later we propose to utilize the learned representations for crucial downstream applications such as design preference evaluation and procedural design generation. We develop the preference model by estimating the density of the learned representations whereas we train an autoregressive transformer model for sequential design generation. We demonstrate our ideas by leveraging a novel dataset of thousands of sequential volumetric designs. Our preference model can compare two arbitrarily given design sequences and is almost $90\%$ accurate in evaluation against random design sequences. Our autoregressive model is also capable of autocompleting a volumetric design sequence from a partial design sequence.
description: 12 pages, 12 figures
Dream reality : August Strindberg's development of the dream form in The Ghost Sonata
Creators: name: Palm, Per Magnus
Publisher: name: University of British Columbia
Year: 2011

description: The following thesis is an examination into August Strindberg's mode of dramatic expression following his so-called "naturalistic" phase. This study will focus on Strindberg's means of expressing his subjective vision of the world around him as it is developed in one of his last plays, The Ghost Sonata,(1907). First, we will view the failure of naturalism as it applies to Strindberg's dramatic objectives; for naturalism as prescribed by Zola proved to be a too restrictive form of poetic expression, limiting the artist to the presentation of objectively verifiable external realism. Strindberg sought to explore the reality of the internal world, or life as it affects the very soul of the dramatist. This he accomplished through the creation of the dramatic dream form where visions and hallucinations merge with past and present objective events into a world of psychological reality. The form and techniques for creating such hallucinatory visions of reality are not new, but a fusion of these into a single dramatic work has been of seminal influence in 20th century drama. Second, we will turn to Strindberg's creative process which bears a remarkable similarity to Freud's explication of the nature of the "dream-work" in Traumdeutung. Furthermore, the dream form of The Ghost Sonata employs the various techniques that comprise the various stages of the dream-work. But these techniques are parallel to certain literary developments of which Strindberg was aware and consequently on which he molded his work. This becomes the basis for the third area of examination which covers the naturalistic, symbolistic and surrealistic techniques as they are applied to the structure of The Ghost Sonata. The conclusion of this examination demonstrates Strindberg's perfect fusion of these previously established literary techniques into the dream-form. Even though none of the separate entities can be attributed to Strindberg’s creative innovations; the use, adaption, expansion and fusion of these techniques into the dream-form serve admirably as a projection of the artist's personal vision of life into dramatic form.
Unified Field Theory From Enlarged Transformation Group. The Covariant Derivative for Conservative Coordinate Transformations and Local Frame Transformations
Creators: name: Green, Edward Lee
Publisher: name: arXiv
Year: 2009
Subjects: subject: General Relativity and Quantum Cosmology (gr-qc)
subject: FOS: Physical sciences

description: Pandres has developed a theory in which the geometrical structure of a real four-dimensional space-time is expressed by a real orthonormal tetrad, and the group of diffeomorphisms is replaced by a larger group called the conservation group. This paper extends the geometrical foundation for Pandres' theory by developing an appropriate covariant derivative which is covariant under all local Lorentz (frame) transformations, including complex Lorentz transformations, as well as conservative transformations. After defining this extended covariant derivative, an appropriate Lagrangian and its resulting field equations are derived. As in Pandres' theory, these field equations result in a stress-energy tensor that has terms which may automatically represent the electroweak field. Finally, the theory is extended to include 2-spinors and 4-spinors.
description: Aug 25 replacement has corrected margin widths
Soliton excitation in waveguide arrays with an effective intermediate dimensionality
Creators: name: Szameit, A.
name: Kartashov, Y. V.
name: Dreisow, F.
name: Heinrich, M.
name: Pertsch, T.
name: Nolte, S.
name: Tunnermann, A.
name: Vysloukh, V. A.
name: Lederer, F.
name: Torner, L.
Publisher: name: arXiv
Year: 2009
Subjects: subject: Optics (physics.optics)
subject: Pattern Formation and Solitons (nlin.PS)
subject: FOS: Physical sciences

description: We reveal and observe experimentally significant modifications undertaken by discrete solitons in waveguide lattices upon the continuous transformation of the lattice structure from one-dimensional to two-dimensional. Light evolution and soliton excitation in arrays with a gradually increasing number of rows are investigated, yielding solitons with an effective reduced dimensionality residing at the edge and in the bulk of the lattice.
description: 14 pages, 5 figures, to appear in Physical Review Letters
On Type Ia Supernovae From The Collisions of Two White Dwarfs
Creators: name: Raskin, Cody
name: Timmes, F. X.
name: Scannapieco, Evan
name: Diehl, Steven
name: Fryer, Chris
Publisher: name: arXiv
Year: 2009
Subjects: subject: Solar and Stellar Astrophysics (astro-ph.SR)
subject: Cosmology and Nongalactic Astrophysics (astro-ph.CO)
subject: FOS: Physical sciences

description: We explore collisions between two white dwarfs as a pathway for making Type Ia Supernovae (SNIa). White dwarf number densities in globular clusters allow 10-100 redshift <1 collisions per year, and observations by (Chomiuk et al. 2008) of globular clusters in the nearby S0 galaxy NGC 7457 have detected what is likely to be a SNIa remnant. We carry out simulations of the collision between two 0.6 solar mass white dwarfs at various impact parameters and mass resolutions. For impact parameters less than half the radius of the white dwarf, we find such collisions produce approximately 0.4 solar masses of Ni56, making such events potential candidates for underluminous SNIa or a new class of transients between Novae and SNIa.
description: 4 pages, 4 figures, 1 table
UV photodissociation of methyl bromide and methyl bromide cation studied by velocity map imaging
Creators: name: Blanchet, Valerie
name: Samartzis, Peter C.
name: Wodtke, Alec M.
Publisher: name: arXiv
Year: 2009
Subjects: subject: Chemical Physics (physics.chem-ph)
subject: FOS: Physical sciences

description: We employ the velocity map imaging technique to measure kinetic energy and angular distributions of state selected CH3 (v2=0,1,2,3) and Br (2P3/2,2P1/2) photofragments produced by methyl bromide photolysis at 215.9 nm. These results show unambiguously that the Br and Br* forming channels result in different vibrational excitation of the umbrella mode of the methyl fragment. Low energy structured features appear on the images which arise from CH3Br+ photodissociation near 330 nm. The excess energy of the probe laser photon is channeled into CH3+ vibrational excitation, most probably in the nu_4 degenerate bend
description: 11 pages
Higher order coherence of exciton-polariton condensates
Creators: name: Horikiri, Tomoyuki
name: Schwendimann, Paolo
name: Quattropani, Antonio
name: Hofling, Sven
name: Forchel, Alfred
name: Yamamoto, Yoshihisa
Publisher: name: arXiv
Year: 2009
Subjects: subject: Mesoscale and Nanoscale Physics (cond-mat.mes-hall)
subject: Other Condensed Matter (cond-mat.other)
subject: FOS: Physical sciences

description: The second and third order coherence functions $g^{(n)}(0) (n=2 {\rm and} 3)$ of an exciton-polariton condensate is measured and compared to the theory. Contrary to an ideal photon laser, deviation from unity in the second and third order coherence functions is observed, thus showing a bunching effect, but not the characteristics of a standard thermal state with $g^{(n)}(0)=n!$. The increase of bunching with the order of the coherence function, $g^{(3)}(0) > g^{(2)}(0)>1$, indicates that the polariton condensate is different from coherent state, number state and thermal state. The experimental results are in agreement with the theoretical model where polariton-polariton and polariton-phonon interactions are responsible for the loss of temporal coherence.
description: 4 pages, 4 figures
On continuity properties for option prices in exponential Lévy models
Creators: name: Cawston, S.
name: Vostrikova, L.
Publisher: name: arXiv
Year: 2009
Subjects: subject: Probability (math.PR)
subject: FOS: Mathematics
subject: 91B24, 60G51

description: For a converging sequence of exponential Lévy models, we give conditions under which the associated sequence of option prices converges. We also study the behaviour of the prices when no such convergence holds. We then consider two special cases, first when the martingale measure is chosen by minimisation of entropy and then when it minimises Hellinger integrals.
description: 24 pages, no figures