cometadata/datacite-rtg-text-other-reclassification-records huggingface dataset:
2-Vector Spaces and Groupoids
Creators: name: Morton, Jeffrey C.
Publisher: name: arXiv
Year: 2008
Subjects: subject: Quantum Algebra (math.QA)
subject: Category Theory (math.CT)
subject: FOS: Mathematics
subject: 20L05; 18E10; 20C99

description: This paper describes a relationship between essentially finite groupoids and 2-vector spaces. In particular, we show to construct 2-vector spaces of Vect-valued presheaves on such groupoids. We define 2-linear maps corresponding to functors between groupoids in both a covariant and contravariant way, which are ambidextrous adjoints. This is used to construct a representation--a weak functor--from Span(Gpd) (the bicategory of groupoids and spans of groupoids) into 2Vect. In this paper we prove this and give the construction in detail.
description: 44 pages, 5 figures - v2 adds new theorem, significant changes to proofs, new section
The analysis of Schottky-barrier solar cells
Creators: name: McOuat, Ronald F.
Publisher: name: University of British Columbia
Year: 2010

description: Several models were developed for the analysis of metal-semiconductor solar cells. The models presented are: (i) a limit model to obtain an idea of what the maximum conversion efficiency of metal-semiconductor solar cells is followed by; (ii) a model suitable for the prediction of the performance of metal/single-crystal silicon solar cells; and (iii) a general model for calculating the efficiency of solar cells fabricated from materials other than Si such as GaAs. Extensive use of numerical methods were required to arrive at solutions to the equations presented in the latter two models. The operation of the models is demonstrated using n-and p-type Si and GaAs with Au being taken as the barrier metal. Calculations are presented showing the effect on solar energy conversion efficiency of surface recombination velocity, barrier height, minority-carrier lifetime, barrier metal thickness, collecting grid configuration, and cell thickness. A comparison of practical and computed data for the Au/n-GaAs system yields good agreement. Based on the results of the calculations, it is shown that metal-semiconductor solar cells provide solar energy conversion of medium efficiency and improvements in efficiency depend on the development of high barrier-height systems.
Pure Spectral Graph Embeddings: Reinterpreting Graph Convolution for Top-N Recommendation
Creators: name: D'Amico, Edoardo
name: Lawlor, Aonghus
name: Hurley, Neil
Publisher: name: arXiv
Year: 2023
Subjects: subject: Information Retrieval (cs.IR)
subject: Machine Learning (cs.LG)
subject: FOS: Computer and information sciences

description: The use of graph convolution in the development of recommender system algorithms has recently achieved state-of-the-art results in the collaborative filtering task (CF). While it has been demonstrated that the graph convolution operation is connected to a filtering operation on the graph spectral domain, the theoretical rationale for why this leads to higher performance on the collaborative filtering problem remains unknown. The presented work makes two contributions. First, we investigate the effect of using graph convolution throughout the user and item representation learning processes, demonstrating how the latent features learned are pushed from the filtering operation into the subspace spanned by the eigenvectors associated with the highest eigenvalues of the normalised adjacency matrix, and how vectors lying on this subspace are the optimal solutions for an objective function related to the sum of the prediction function over the training data. Then, we present an approach that directly leverages the eigenvectors to emulate the solution obtained through graph convolution, eliminating the requirement for a time-consuming gradient descent training procedure while also delivering higher performance on three real-world datasets.
Dynamical delocalization of Majorana edge states by sweeping across a quantum critical point
Creators: name: Bermudez, A.
name: Amico, L.
name: Martin-Delgado, M. A.
Publisher: name: arXiv
Year: 2009
Subjects: subject: Strongly Correlated Electrons (cond-mat.str-el)
subject: High Energy Physics - Theory (hep-th)
subject: Quantum Physics (quant-ph)
subject: FOS: Physical sciences

description: We study the adiabatic dynamics of Majorana fermions across a quantum phase transition. We show that the Kibble-Zurek scaling, which describes the density of bulk defects produced during the critical point crossing, is not valid for edge Majorana fermions. Therefore, the dynamics governing an edge state quench is nonuniversal and depends on the topological features of the system. Besides, we show that the localization of Majorana fermions is a necessary ingredient to guaranty robustness against defect production.
description: Submitted to the Special Issue on "Dynamics and Thermalization in Isolated Quantum Many-Body Systems" in New Journal of Physics. Editors:M. Cazalilla, M. Rigol. New references and some typos corrected
Enantioselective Reactions Promoted by Organocatalytic Species From The Natural Chiral Pool
Creators: name: Gioia, Claudio <1984>
Publisher: name: Alma Mater Studiorum - Università di Bologna
Year: 2012
Subjects: CHIM/06 Chimica organica

description: During the course of my Ph.D. in the laboratories directed by Prof. Alfredo Ricci at the Department of Organic Chemistry “A. Mangini” of the University of Bologna, I was involved in the study and the application of a number of organocatalytic systems, all coming from the natural chiral pool.
The first part of this thesis will be devoted to new homogeneous organocatalytic reactions promoted by Cinchona alkaloid-based organocatalysts. Quinine based catalysts were found to be a very effective catalyst for Diels-Alder reactions involving 3-vinylindoles. Excellent results in terms of yields and enantioselectivities were achieved, outlining also a remarkable organocatalytic operational mode mimicking enzymatic catalysis. The same reaction with 2-vinylindoles showed a completely different behaviour resulting in an unusual resolution-type process. The asymmetric formal [3+2] cycloaddition with in situ generated N-carbamoyl nitrones using Cinchona-derived quaternary ammonium salts as versatile catalysts under phase transfer conditions, outlines another application in organocatalysis of this class of alkaloids.
During the seven months stage in the Prof. Helma Wennemers’ group at the Department of Chemistry of the University of Basel (Switzerland) I have been involved in organocatalysis promoted by oligopeptides. My contribution regarded the 1,4-addition reaction of aldehydes to nitroolefins. 
In the work performed at the Department of Organic Chemistry “A. Mangini” of the University of Bologna, in collaboration with the ‘Institut Charles Gerhardt-Montpellier, of Montpellier (France) the possibility of performing for the first time heterogeneous organocatalysis by using a natural polysaccharide biopolymer as the source of chirality was disclosed. With chitosan, derived from deacetylation of chitin, a highly enantioselective heterogeneous organocatalytic aldol reaction could be performed. The use of an eco-friendly medium such as water, the recyclability of the catalytic specie and the renewable nature of the polysaccharide are assets of this new approach in organocatalysis and open interesting perspectives for the use of biopolymers.
Canonical quantization of electromagnetic field in an anisotropic polarizable and magnetizable medium with spatial-temporal dispersion
Creators: name: Amooshahi, Majid
Publisher: name: arXiv
Year: 2008
Subjects: subject: Quantum Physics (quant-ph)
subject: FOS: Physical sciences

description: Modeling an anisotropic spatially and temporarily dispersive magnetodielectric medium by two independent collections of three dimensional vector fields, we demonstrate a fully canonical quantization of electromagnetic field in the presence of such a medium. Two tensor fields which couple the electromagnetic field with the medium and have an important role in this quantization method are introduced. The electric and magnetic polarization fields of the medium naturally are concluded in terms of the coupling tensors and the dynamical variables modeling the magnetodielectric medium. In Heisenberg picture, the constitutive equations of the medium together with the Maxwell laws are obtained as the equations of motion of the total system and the susceptibility tensors of the medium are calculated in terms of the coupling tensors. Following a perturbation method the Green function related to the total system is found and the time dependence of electromagnetic field operators is derived.
description: 19 pages, No figure
I limiti all'autonomia procedurale degli Stati membri dell'UE in materia risarcitoria
The limits to the procedural autonomy of the Member States of the EU: the case of the actions for damages for breaches of EU law
Creators: name: Di Marco, Antonio Calogero <1981>
Publisher: name: Alma Mater Studiorum - Università di Bologna
Year: 2012
Subjects: IUS/14 Diritto dell'Unione Europea

description: This work analyses the limits that the principle of State liability for damages suffered by individuals because of breach of EU law poses to the procedural autonomy of the Member States of the EU.
The introductory part of this work is dedicated to the general character of the limitations EU law poses to the State’s competence in procedural matters.
The first part of the research, instead, focuses on the specific limits that european law poses on the rules of procedure related to the legal regime of the right to compensation and its operating conditions; in particular, this first part explores respectively the “substantive” and “procedural” limits that EU law poses to the State’s autonomy to regulate actions for damages for breaches of EU law. The substantial limits concern the conditions of eligibility of liability and the constitutive conditions of the right to compensation; the procedural limits to the action for damages refer to the concrete organization and characteristics of the judicial action.
The second part of the research is devoted to rules of procedure governing the relations between judicial remedies explicitly aimed at protecting the right to reparation and other remedies that may be relevant, both europeans and nationals. The first chapter of the second part of this work focuses on the rules governing the relations between the action for damages brought up at the national level and the remedies provided by european Treaties; finally, I explore the relations between the action for damages brought up at the national level and other remedies present in the same national juridical order.
I reconstruct all the limits to the procedural autonomy of Member States concerning the right to compensation; consequently, I verify that those limits represent part of the system of internal procedures, able to guarantee the respect of european law.
A metáfora do módulo na música interativa
Creators: name: Romaga, Afonso Felipe
name: Padovani, José Henrique
Publisher: name: Labfront/UEMG
Year: 2023

description: Entre o final do século XIX e metade do XX nos deparamos com uma série de invenções no ramo da elétrica e eletrônica que possibilitaram experimentos com registro e edição de áudio, além da criação de novos instrumentos que tinham por base sinais elétricos. Por volta do final dos anos 50 começam a surgir os primeiros sintetizadores modulares, que são instrumentos criados a partir de módulos específicos de geração e modulação de sinais, conectados através de cabos (patches). Com base nesta breve contextualização, e a partir dos conceitos desenvolvidos por Simondon sobre a transdução e mediação, propomos traçar um paralelo de como o objeto “módulo” e uma lógica de pensamento modular são um padrão sistemático para diversas abordagens de criação na música interativa, que vão desde a combinação de sistemas e instrumentos elétricos até ao processo de desenvolvimento musical computacional em softwares e ambientes de programação.
Adjoint methods for static Hamilton-Jacobi equations
Creators: name: Tran, Hung Vinh
Publisher: name: arXiv
Year: 2009
Subjects: subject: Analysis of PDEs (math.AP)
subject: FOS: Mathematics

description: We use the adjoint methods to study the static Hamilton-Jacobi equations and to prove the speed of convergence for those equations. The main new ideas are to introduce adjoint equations corresponding to the formal linearizations of regularized equations of vanishing viscosity type, and from the solutions $σ^ε$ of those we can get the properties of the solutions $u$ of the Hamilton-Jacobi equations. We classify the static equations into two types and present two new ways to deal with each type. The methods can be applied to various static problems and point out the new ways to look at those PDE.
description: final version
title: GSICS quarterly. Volume 4, number 4 (2010)
Creators: name: Global Space-Based Inter-Calibration System Coordination Center,
Publisher: name: U.S. Department of Commerce, National Oceanic and Atmospheric Administration, National Environmental Satellite, Data, and Information Service, Center for Satellite Applications and Research
Year: 2010
Subjects: subject: Satellite meteorology
subject: Global Observing System (Meteorology)

description: GSICS Quarterly is a newsletter designed to communicate GSICS activities to all GSICS members and partners, as well as to satellite data users and policy makers
Study of the glass transition in the amorphous interlamellar phase of highly crystallized poly(ethylene terephthalate)
Creators: name: Sellares, J.
name: Diego, J. A.
name: Belana, J.
Publisher: name: arXiv
Year: 2009
Subjects: subject: Materials Science (cond-mat.mtrl-sci)
subject: FOS: Physical sciences

description: Poly(ethylene terephthalate) (PET) is a semi--crystalline polymer that can be crystallized to different degrees heating from the amorphous state. Even when primary crystallization has been completed, secondary crystallization can take place with further annealing and modify the characteristics of the amorphous interlamellar phase. In this work we study the glass transition of highly crystallized PET and in which way it is modified by secondary crystallization. Amorphous PET samples were annealed for 4 hours at temperatures between 140C and 180C. The secondary crystallization process was monitored by differential scanning calorimetry and the glass transition of the remaining interllamelar amorphous phase was studied by Thermally Stimulated Depolarization Currents measurements. Non--isothermal window polarization is employed to resolve the relaxation in modes with a well--defined relaxation time that are subsequently adjusted to several standard models. Analysis of experimental results, show that cooperativity is reduced to a great extend in the interlamellar amorphous regions. The evolution of the modes on crystallization temperature reveals that large scale movements are progressively replaced by more localized ones, with higher frequency, as crystallization takes place at higher temperatures. As a consequence, the glass transition temperature of the amorphous interlamellar phase tends to lower values for higher annealing temperatures. Evolution of calorimetric scans of the glass transition are simulated from the obtained results and show the same behaviour. The interpretation of these results in terms of current views about secondary crystallization is discussed.
description: 30 pages, 5 tables, 12 figures; figure 5 modified
title: GSICS quarterly. Volume 6, number 2 (2012)
Creators: name: Global Space-Based Inter-Calibration System Coordination Center,
Publisher: name: U.S. Department of Commerce, National Oceanic and Atmospheric Administration, National Environmental Satellite, Data, and Information Service, Center for Satellite Applications and Research
Year: 2012
Subjects: subject: Satellite meteorology
subject: Global Observing System (Meteorology)

description: GSICS Quarterly is a newsletter designed to communicate GSICS activities to all GSICS members and partners, as well as to satellite data users and policy makers
Manuscript supplementary materials from Testosterone amplifies the negative valence of an agonistic gestural display by exploiting receiver perceptual bias
Creators: name: Anderson, Nigel K.
name: Grabner, Martina
name: Mangiamele, Lisa A.
name: Preininger, Doris
name: Fuxjager, Matthew J.
Publisher: name: The Royal Society
Year: 2021
Subjects: subject: Evolutionary Biology
subject: FOS: Biological sciences
subject: Ecology
subject: 60801 Animal Behaviour

description: Contains supplementary text, figures, tables and movie legends referenced in the main manuscript.
The past and present of Robson Street
Creators: name: Elsamny, Afaf Makarem
Publisher: name: University of British Columbia
Year: 2010

description: This study investigates the prospects for survival of a small-business, high character area in downtown Vancouver, namely, the 1000 and 1100 blocks of Robson Street. The text includes, first, an extensive literature search into general characteristics of downtown commercial areas and various aspects of commercial rehabilitation. A brief history of the forces which shaped Robson Street follows, then information obtained from merchants through a questionnaire regarding customer attraction, store location and size, sales volume, attitudes toward the area, etc. After this background information, the paper continues with the results of an abstract simulation by computer of the area's future under three different circumstances. The findings of the study seem, essentially, to support the two hypotheses made that 1.) change in the area is causing imbalance and 2.) the area will not, without outside intervention, be able to survive, prosper, and maintain its unique character.
Implications of a spatially resolved main sequence for the size evolution of star forming galaxies
Creators: name: Pezzulli, Gabriele
Publisher: name: arXiv
Year: 2021
Subjects: subject: Astrophysics of Galaxies (astro-ph.GA)
subject: FOS: Physical sciences

description: Two currently debated problems in galaxy evolution, the fundamentally local or global nature of the main sequence of star formation and the evolution of the mass-size relation of star forming galaxies (SFGs), are shown to be intimately related to each other. As a preliminary step, a growth function $g$ is defined, which quantifies the differential change in half-mass radius per unit increase in stellar mass ($g = d \log R_{1/2}/d \log M_\star$) due to star formation. A general derivation shows that $g = K Δ(sSFR)/sSFR$, meaning that $g$ is proportional to the relative difference in specific star formation rate between the outer and inner half of a galaxy, with $K$ a dimensionless structural factor for which handy expressions are provided. As an application, it is shown that galaxies obeying a fundamentally local main sequence also obey, to a good approximation, $g \simeq γn$, where $γ$ is the slope of the normalized local main sequence ($sSFR \propto Σ_\star^{-γ}$) and $n$ the Sersic index. An exact expression is also provided. Quantitatively, a fundamentally local main sequence is consistent with SFGs growing along a stationary mass-size relation, but inconsistent with the continuation at $z=0$ of evolutionary laws derived at higher $z$. This demonstrates that either the main sequence is not fundamentally local, or the mass-size relation of SFGs has converged to an equilibrium state some finite time in the past, or both.
description: Accepted for publication in MNRAS
Quarkonium in Hot Medium
Creators: name: Petreczky, P.
Publisher: name: arXiv
Year: 2010
Subjects: subject: High Energy Physics - Phenomenology (hep-ph)
subject: High Energy Physics - Lattice (hep-lat)
subject: FOS: Physical sciences

description: I review recent progress in studying quarkonium properties in hot medium as well as possible consequences for quarkonium production in heavy ion collisions.
description: Invited talk at SQM 2009, Buzios, Brazil, Sep. 27 -Oct. 2 2009, LaTeX, 8 pages,3 figures; typos corrected, references added
Resolution of the finite Markov moment problem
Creators: name: Gosse, Laurent
name: Runborg, Olof
Publisher: name: arXiv
Year: 2009
Subjects: subject: Numerical Analysis (math.NA)
subject: Statistics Theory (math.ST)
subject: FOS: Mathematics
subject: 65J22

description: We expose in full detail a constructive procedure to invert the so--called "finite Markov moment problem". The proofs rely on the general theory of Toeplitz matrices together with the classical Newton's relations.
Measure Equivalence Rigidity and Bi-exactness of Groups
Creators: name: Sako, Hiroki
Publisher: name: arXiv
Year: 2009
Subjects: subject: Group Theory (math.GR)
subject: Operator Algebras (math.OA)
subject: FOS: Mathematics
subject: 20F38, 37A20, 46L05

description: We get three types of results on measure equivalence rigidity; direct product groups of Ozawa's class $\mathcal{S}$ groups, wreath product groups and amalgamated free products. We prove measure equivalence factorization results on direct product groups of Ozawa's class $\mathcal{S}$ groups. As consequences, Monod--Shalom type orbit equivalence rigidity theorems follow. We prove that if two wreath product groups $A \wr G$, $B \wr Γ$ of non-amenable exact direct product groups $G$, $Γ$ with amenable bases $A$, $B$ are measure equivalent, then $G$ and $Γ$ are measure equivalent. We get Bass--Serre rigidity results on amalgamated free products of non-amenable exact direct product groups.
description: 34 pages
Spin liquid to spin glass crossover in the random quantum Heisenberg magnet
Creators: name: Christos, Maine
name: Haehl, Felix M.
name: Sachdev, Subir
Publisher: name: arXiv
Year: 2021
Subjects: subject: Strongly Correlated Electrons (cond-mat.str-el)
subject: Disordered Systems and Neural Networks (cond-mat.dis-nn)
subject: High Energy Physics - Theory (hep-th)
subject: FOS: Physical sciences

description: We study quantum SU($M$) spins with all-to-all and random Heisenberg exchange interactions of root-mean-square strength $J$. The $M \rightarrow \infty$ model has a spin liquid ground state with the spinons obeying the equations of the Sachdev-Ye-Kitaev (SYK) model. Numerical studies of the SU(2) model with $S=1/2$ spins show spin glass order in the ground state, but also display SYK spin liquid behavior in the intermediate frequency spin spectrum. We employ a $1/M$ expansion to describe the crossover from fractionalized fermionic spinons to a confining spin glass state with weak spin glass order $q_{EA}$. The SYK spin liquid behavior persists down to a frequency $ω_\ast \sim J q_{EA}$, and for $ω< ω_\ast$, the spectral density is linear in $ω$, thus quenching the extensive zero temperature entropy of the spin liquid. The linear $ω$ spectrum is qualitatively similar to that obtained earlier using bosonic spinons for large $q_{EA}$. We argue that the extensive SYK spin liquid entropy is transformed as $T \rightarrow 0$ to an extensive complexity of the spin glass state.
description: 26 pages, 5 figures
title: GSICS quarterly. Volume 5, number 2 (2011)
Creators: name: Global Space-Based Inter-Calibration System Coordination Center,
Publisher: name: U.S. Department of Commerce, National Oceanic and Atmospheric Administration, National Environmental Satellite, Data, and Information Service, Center for Satellite Applications and Research
Year: 2011
Subjects: subject: Satellite meteorology
subject: Global Observing System (Meteorology)

description: GSICS Quarterly is a newsletter designed to communicate GSICS activities to all GSICS members and partners, as well as to satellite data users and policy makers
The disk-torus system in active galactic nuclei: possible evidence of highly spinning black holes
Creators: name: Campitiello, Samuele
name: Celotti, Annalisa
name: Ghisellini, Gabriele
name: Sbarrato, Tullia
Publisher: name: arXiv
Year: 2021
Subjects: subject: High Energy Astrophysical Phenomena (astro-ph.HE)
subject: Astrophysics of Galaxies (astro-ph.GA)
subject: FOS: Physical sciences

description: We study the ratio $R$ between the luminosity of the torus and that of the accretion disk, inferred from the relativistic model KERRBB for a sample of approximately 2000 luminosity-selected radio-quiet Type I active galactic nuclei from the Sloan Digital Sky Survey catalog. We find a mean ratio $R \approx 0.8$ and a considerable number of sources with $R \gtrsim 1$. Our statistical analysis regarding the distribution of the observed ratios suggests that the largest values might be linked to strong relativistic effects due to a large black hole spin ($a > 0.8$), despite the radio-quiet nature of the sources. The mean value of $R$ sets a constraint on the average torus aperture angle (in the range $30^{\circ} < θ_{\rm T} < 70^{\circ}$) and, for about one-third of the sources, the spin must be $a > 0.7$. Moreover, our results suggest that the strength of the disk radiation (i.e., the Eddington ratio) could shape the torus geometry and the relative luminosity ratio $R$. Given the importance of the involved uncertainties on this statistical investigation, an extensive analysis and discussion have been made to assess the robustness of our results.
description: 13 pages, 10 figures, accepted for publication in Astronomy & Astrophysics
Constrained Optimization via Exact Augmented Lagrangian and Randomized Iterative Sketching
Creators: name: Hong, Ilgee
name: Na, Sen
name: Mahoney, Michael W.
name: Kolar, Mladen
Publisher: name: arXiv
Year: 2023
Subjects: subject: Optimization and Control (math.OC)
subject: Machine Learning (cs.LG)
subject: Numerical Analysis (math.NA)
subject: Machine Learning (stat.ML)
subject: FOS: Mathematics
subject: FOS: Computer and information sciences

description: We consider solving equality-constrained nonlinear, nonconvex optimization problems. This class of problems appears widely in a variety of applications in machine learning and engineering, ranging from constrained deep neural networks, to optimal control, to PDE-constrained optimization. We develop an adaptive inexact Newton method for this problem class. In each iteration, we solve the Lagrangian Newton system inexactly via a randomized iterative sketching solver, and select a suitable stepsize by performing line search on an exact augmented Lagrangian merit function. The randomized solvers have advantages over deterministic linear system solvers by significantly reducing per-iteration flops complexity and storage cost, when equipped with suitable sketching matrices. Our method adaptively controls the accuracy of the randomized solver and the penalty parameters of the exact augmented Lagrangian, to ensure that the inexact Newton direction is a descent direction of the exact augmented Lagrangian. This allows us to establish a global almost sure convergence. We also show that a unit stepsize is admissible locally, so that our method exhibits a local linear convergence. Furthermore, we prove that the linear convergence can be strengthened to superlinear convergence if we gradually sharpen the adaptive accuracy condition on the randomized solver. We demonstrate the superior performance of our method on benchmark nonlinear problems in CUTEst test set, constrained logistic regression with data from LIBSVM, and a PDE-constrained problem.
description: 25 pages, 4 figures
title: GSICS quarterly. Volume 5, number 1 (2011)
Creators: name: Global Space-Based Inter-Calibration System Coordination Center,
Publisher: name: U.S. Department of Commerce, National Oceanic and Atmospheric Administration, National Environmental Satellite, Data, and Information Service, Center for Satellite Applications and Research
Year: 2011
Subjects: subject: Satellite meteorology
subject: Global Observing System (Meteorology)

description: GSICS Quarterly is a newsletter designed to communicate GSICS activities to all GSICS members and partners, as well as to satellite data users and policy makers
The HASHTAG project: The First Submillimeter Images of the Andromeda Galaxy from the Ground
Creators: name: Smith, Matthew W. L.
name: Eales, Stephen A.
name: Williams, Thomas G.
name: Lee, Bumhyun
name: Li, Zongnan
name: Barmby, Pauline
name: Bureau, Martin
name: Chapman, Scott
name: Cho, Brian S.
name: Chung, Aeree
name: Chung, Eun Jung
name: Chung, Hui-Hsuan
name: Clark, Christopher J. R.
name: Clements, David L.
name: Davis, Timothy A.
name: De Looze, Ilse
name: Eden, David J.
name: Athikkat-Eknath, Gayathri
name: Ford, George P.
name: Gao, Yu
name: Gear, Walter
name: Gomez, Haley L.
name: de Grijs, Richard
name: He, Jinhua
name: Ho, Luis C.
name: Hughes, Thomas M.
name: Jiao, Sihan
name: Li, Zhiyuan
name: Kemper, Francisca
name: Kirchschlager, Florian
name: Koch, Eric W.
name: Kong, Albert K. H.
name: Lee, Chien-Hsiu
name: Lin, En-Tzu
name: Mairs, Steve
name: Michalowski, Michal J.
name: Pattle, Kate
name: Peng, Yingjie
name: Ragan, Sarah E.
name: Rawlings, Mark G.
name: Rigopoulou, Dimitra
name: Saintonge, Amelie
name: Schruba, Andreas
name: Tang, Xindi
name: Wang, Junfeng
name: Whitworth, Anthony P.
name: Wilson, Christine D.
name: Yim, Kijeong
name: Zhu, Ming
Publisher: name: arXiv
Year: 2021
Subjects: subject: Astrophysics of Galaxies (astro-ph.GA)
subject: FOS: Physical sciences

description: Observing nearby galaxies with submillimeter telescopes on the ground has two major challenges. First, the brightness is significantly reduced at long submillimeter wavelengths compared to the brightness at the peak of the dust emission. Second, it is necessary to use a high-pass spatial filter to remove atmospheric noise on large angular scales, which has the unwelcome by-product of also removing the galaxy's large-scale structure. We have developed a technique for producing high-resolution submillimeter images of galaxies of large angular size by using the telescope on the ground to determine the small-scale structure (the large Fourier components) and a space telescope (Herschel or Planck) to determine the large-scale structure (the small Fourier components). Using this technique, we are carrying out the HARP and SCUBA-2 High Resolution Terahertz Andromeda Galaxy Survey (HASHTAG), an international Large Program on the James Clerk Maxwell Telescope, with one aim being to produce the first high-fidelity high-resolution submillimeter images of Andromeda. In this paper, we describe the survey, the method we have developed for combining the space-based and ground-based data, and present the first HASHTAG images of Andromeda at 450 and 850um. We also have created a method to predict the CO(J=3-2) line flux across M31, which contaminates the 850um band. We find that while normally the contamination is below our sensitivity limit, the contamination can be significant (up to 28%) in a few of the brightest regions of the 10 kpc ring. We therefore also provide images with the predicted line emission removed.
description: 26 pages, 19 figures. Submitted to ApJS June 2021, Accepted September 2021
Quantum Fields on Star Graphs with Bound States at the Vertex
Creators: name: Bellazzini, B.
name: Mintchev, M.
name: Sorba, P.
Publisher: name: arXiv
Year: 2008
Subjects: subject: High Energy Physics - Theory (hep-th)
subject: Mesoscale and Nanoscale Physics (cond-mat.mes-hall)
subject: Strongly Correlated Electrons (cond-mat.str-el)
subject: Mathematical Physics (math-ph)
subject: FOS: Physical sciences

description: We investigate the propagation of a massless scalar field on a star graph, modeling the junction of $n$ quantum wires. The vertex of the graph is represented by a point-like impurity (defect), characterized by a one-body scattering matrix. The general case of off-critical scattering matrix with bound and/or antibound states is considered. We demonstrate that the contribution of these states to the scalar field is fixed by causality (local commutativity), which is the key point of our investigation. Two different regimes of the theory emerge at this stage. If bound sates are absent, the energy is conserved and the theory admits unitary time evolution. The behavior changes if bound states are present, because each such state generates a kind of damped harmonic oscillator in the spectrum of the field. These oscillators lead to the breakdown of time translation invariance. We study in both regimes the electromagnetic conductance of the Luttinger liquid on the quantum wire junction. We derive an explicit expression for the conductance in terms of the scattering matrix and show that antibound and bound states have a different impact, giving raise to oscillations with exponentially damped and growing amplitudes respectively.
description: LaTex 1+29 pages, 2 figures: Expanded version with new title and abstract; clarifying comments, fig.2 and references added; final version to appear in J. Math. Phys
On the Properties of Spectroscopically-Confirmed Ultra-Diffuse Galaxies Across Environment
Creators: name: Kadowaki, Jennifer
name: Zaritsky, Dennis
name: Donnerstein, R. L.
name: RS, Pranjal
name: Karunakaran, Ananthan
name: Spekkens, Kristine
Publisher: name: arXiv
Year: 2021
Subjects: subject: Astrophysics of Galaxies (astro-ph.GA)
subject: FOS: Physical sciences

description: We present new redshift measurements for 19 candidate, ultra-diffuse galaxies (UDGs) from the Systematically Measuring Ultra-Diffuse Galaxies (SMUDGes) survey after conducting a long-slit, spectroscopic follow-up campaign on 23 candidates at the Large Binocular Telescope. We combine these results with redshift measurements from other sources for 29 SMUDGes and 20 non-SMUDGes candidate UDGs. Together, this sample yields 44 spectroscopically-confirmed UDGs ($r_e\geq1.5$ kpc and $μ_g(0)\geq24$ mag arcsec$^{-2}$ within uncertainties) and spans cluster and field environments, with all but one projected on the Coma cluster and environs. We find no statistically significant differences in the structural parameters of cluster and non-cluster confirmed UDGs, although there are hints of differences among the axis ratio distributions. Similarly, we find no significant structural differences among those in locally dense or sparse environments. However, we observe a significant difference in color with respect to projected cluster-centric radius, confirming trends observed previously in statistical UDG samples. This trend strengthens further when considering whether UDGs reside in either cluster or locally dense environments, suggesting starkly different star formation histories for UDGs residing in high and low-density environments. Of the 16 large ($r_e \geq 3.5$ kpc) UDGs in our sample, only one is a field galaxy that falls near the early-type galaxy red sequence. No other field UDGs found in low density environments fall near the red sequence. This finding, in combination with our detection of GALEX NUV flux in nearly half of the UDGs in sparse environments, suggest that field UDGs are a population of slowly evolving galaxies.
description: 27 pages, 11 figures, Accepted to ApJ
Multi-phase outflows in high redshift quasar host galaxies
Creators: name: Vayner, Andrey
name: Zakamska, Nadia
name: Wright, Shelley A.
name: Armus, Lee
name: Murray, Norman
name: Walth, Gregory
Publisher: name: arXiv
Year: 2021
Subjects: subject: Astrophysics of Galaxies (astro-ph.GA)
subject: FOS: Physical sciences

description: We present Atacama Large Millimeter/submillimeter Array (ALMA) observations of six radio-loud quasar host galaxies at $z=1.4-2.3$. We combine the kpc-scale resolution ALMA observations with high spatial-resolution adaptive optics integral field spectrograph data of the ionized gas. We detect molecular gas emission in five quasar host galaxies and resolve the molecular interstellar medium using the CO (3-2) or CO (4-3) rotational transitions. Clumpy molecular outflows are detected in four quasar host galaxies and in a merger system 21 kpc away from one quasar. Between the ionized and cold-molecular gas phases, the majority of the outflowing mass is in a molecular phase, while for three out of four detected multi-phase gas outflows, the majority of the kinetic luminosity and momentum flux is in the ionized phase. Combining the energetics of the multi-phase outflows, we find that their driving mechanism is consistent with energy-conserving shocks produced by the impact of the quasar jets with the gas in the galaxy. By assessing the molecular gas mass to the dynamics of the outflows, we estimate a molecular gas depletion time scale of a few Myr. The gas outflow rates exceed the star formation rates, suggesting that quasar feedback is a major mechanism of gas depletion at the present time. The coupling efficiency between the kinetic luminosity of the outflows and the bolometric luminosity of the quasar of 0.1-1% is consistent with theoretical predictions. Studying multi-phase gas outflows at high redshift is important for quantifying the impact of negative feedback in shaping the evolution of massive galaxies.
description: 23 pages, 8 figures, 6 tabes. Accepted for publication in ApJ
title: EnteroRM. Todo lo que un técnico necesita saber.
Creators: name: Fraga Piñeiro, Carlos
Publisher: name: Sociedad Española de Radiología Médica
Year: 2014
Subjects: subject: MR
subject: Abdomen

description: Objetivo docente
Revisión del tema
Conclusiones
Bibliografía
description: Objetivo docente:
- Comprender las distintas secuencias de RM que se necesitan para tener una buena resolución espacial y temporal en el estudio de las asas intestinales. - Conocer la preparación que necesita el paciente y los distintos medios de contraste oral que...
How to read the length of a braid from its curve diagram
Creators: name: Wiest, Bert
Publisher: name: arXiv
Year: 2009
Subjects: subject: Geometric Topology (math.GT)
subject: Group Theory (math.GR)
subject: FOS: Mathematics

description: We prove that the Garside length a braid is equal to a winding-number type invariant of the curve diagram of the braid.
description: Version 4: Proposition 3.1 of the previous version was wrong. In the current version, a similar statement is made, but only in the form of a conjecture. The main result of the paper is not affected by this mistake
title: La radiografía simple de tórax en la valoración inicial de las disfagias
Creators: name: Castillo de Juan, Javier
Publisher: name: Sociedad Española de Radiología Médica
Year: 2014
Subjects: subject: Thorax
subject: Conventional radiography

description: Objetivo docente
Revisión del tema
Conclusiones
Bibliografía
description: Objetivo docente:
Resaltar la importancia de la Rx simple de tórax en la valoración inicial de las disfagias. Enumerar diversas causas de disfagia en las cuales la Rx simple de tórax puede aportar información inicial...
Long-range fermions and critical dualities
Creators: name: Chai, Noam
name: Chakraborty, Soumangsu
name: Goykhman, Mikhail
name: Sinha, Ritam
Publisher: name: arXiv
Year: 2021
Subjects: subject: High Energy Physics - Theory (hep-th)
subject: Strongly Correlated Electrons (cond-mat.str-el)
subject: FOS: Physical sciences

description: We construct long-range fermionic models with the Gross-Neveu and Gross-Neveu-Yukawa interaction, and argue that their critical regimes are equivalent. To this end, we calculate various CFT data in $ε$- and $1/N$- expansion, and demonstrate their agreement in the overlapping regimes of validity.
A Riemann singularity theorem for integral curves
Creators: name: Casalaina-Martin, Sebastian
name: Kass, Jesse Leo
Publisher: name: arXiv
Year: 2009
Subjects: subject: Algebraic Geometry (math.AG)
subject: FOS: Mathematics
subject: 14H40, 14H42, 14H20, 14K25

description: We prove results generalizing the classical Riemann Singularity Theorem to the case of integral, singular curves. The main result is a computation of the multiplicity of the theta divisor of an integral, nodal curve at an arbitrary point. We also conjecture a general formula for the multiplicity of points on the theta divisor of a singular integral curve and present some evidence for this conjecture. Our results give a partial answer to a question posed by Lucia Caporaso in a recent paper.
description: 23 pages, AMS Latex, improved exposition, to appear in the Amer. J. Math
title: Valoración radiológica de complicaciones postoperatorias intraabdominales.
Creators: name: Tercero Azorín, Maria Isabel
Publisher: name: Sociedad Española de Radiología Médica
Year: 2014
Subjects: subject: Ultrasound
subject: CT
subject: Abdomen

description: Objetivo docente
Revisión del tema
Conclusiones
Bibliografía
description: Objetivo docente:
Conocer cuáles son algunas de las complicaciones de caracter urgente más frecuentes que pueden aparecer tras procedimientos quirúrgicos intraabdominales así como los hallazgos radiológicos que nos permitirán...
title: Manifestaciones mamarias de enfermedades sistémicas de carácter autoinmune.
Creators: name: Tercero Azorín, Maria Isabel
Publisher: name: Sociedad Española de Radiología Médica
Year: 2014
Subjects: subject: Breast
subject: Mammography
subject: MR

description: Objetivos
Material y método
Resultados
Conclusiones
Bibliografía
description: Objetivos:
Describir los hallazgos radiológicos mamográficos y de ecografia mamaria así como la presentación clínica de algunas de las principales mastopatías de carácter autoinmune y/o inflamatorio,
las cuales son bastante desconocidas e...
Nature Labs Research on Internet of Things (IoT)
Creators: name: LABS, NATURE
Publisher: name: figshare
Year: 2022
Subjects: subject: Applied Computer Science
subject: Artificial Intelligence and Image Processing
subject: FOS: Computer and information sciences
subject: Computation Theory and Mathematics
subject: 80107 Natural Language Processing
subject: 80503 Networking and Communications
subject: 80205 Numerical Computation

description: Collection of research dataset for medication of different variants of SARS-Cov-2 in healthcare domain for World Health Organization by the prototype using Internet of Things (IoT) Date of Publication: Feb 18, 2022. Journal: Research Gate Configure AWS IoT UN (WHO) - Covid-19 Variants in SARS-Cov-2 to communicate with industrial equipment to capture data and video on the factory floor. Created a custom web portal using AWS IoT Monitor to visualize factory data and industrial KPIs in near real-time. Configure the AWS IoT to connect and collect data from factory machines using OPC-UA. Use AWS IoT to model assets that represent on-premises devices, equipment and processes, and ingest historian data into AWS. Configure AWS IoT WHO healthcare AI sensors to communicate with medical industrial equipment to capture data and video on the factory floor. Create a custom web portal using AWS IoT Monitor to visualize factory data Set up the manufacturing device identifier in a database. The device connects to API Gateway and requests registration from the Certificate Provisioning Mechanism (CPM). The request is validated. Lambda requests X.509 certificates from your Private Certificate Authority (CA). provisioning system registered the CA with AWS IoT Core. API Gateway passes the device credentials to the device. The device initiates the registration workflow with AWS IoT Core. SME for creating the Well-Architected Framework identifies the IoT set of design principles in order to facilitate good design in the cloud with IoT:
title: Variantes anatómicas, alteraciones congénitas y valvulares de la aórta torácica.
Creators: name: Cambronero Gómez, Jennifer
Publisher: name: Sociedad Española de Radiología Médica
Year: 2014
Subjects: subject: Congenital
subject: eLearning
subject: Normal variants
subject: Education
subject: MR-Angiography
subject: CT
subject: CT-Angiography
subject: Vascular
subject: Anatomy
subject: Arteries / Aorta

description: Objetivo docente
Revisión del tema
Conclusiones
Bibliografía
description: Objetivo docente:
Recordar la embriología de la aorta torácica y sus ramas principales. Descripción de hallazgos radiológicos mediante T.A.C y RM de las variantes anatómicas,
alteraciones congénitas y valvulares de la aorta...
title: Evaluación de los diferentes criterios de respuesta en imagen oncológica: análisis, evolución, claves y limitaciones.
Creators: name: Batista Martin, Daniel
Publisher: name: Sociedad Española de Radiología Médica
Year: 2014
Subjects: subject: Neoplasia
subject: Metastases
subject: CT
subject: MR
subject: PET
subject: Oncology

description: Objetivo docente
Revisión del tema
Conclusiones
Bibliografía
description: Objetivo docente:
Describir los diferentes criterios de respuesta existentes en imagen oncológica y analizar su evolución así como sus claves y...
Acoustic black holes for relativistic fluids
Creators: name: Ge, Xian-Hui
name: Sin, Sang-Jin
Publisher: name: arXiv
Year: 2010
Subjects: subject: High Energy Physics - Theory (hep-th)
subject: Quantum Gases (cond-mat.quant-gas)
subject: Superconductivity (cond-mat.supr-con)
subject: General Relativity and Quantum Cosmology (gr-qc)
subject: FOS: Physical sciences

description: We derive a new acoustic black hole metric from the Abelian Higgs model. In the non-relativistic limit, while the Abelian Higgs model becomes the Ginzburg-Landau model, the metric reduces to an ordinary Unruh type. We investigate the possibility of using (type I and II) superconductors as the acoustic black holes. We propose to realize experimental acoustic black holes by using spiral vortices solutions from the Navier-stokes equation in the non-relativistic classical fluids.
description: 16 pages. typos corrected, contents expanded