cometadata/datacite-rtg-text-other-reclassification-records huggingface dataset:
Towards algebraic iterated integrals on elliptic curves via the universal vectorial extension
Creators: name: Fonseca, Tiago J.
name: Matthes, Nils
Publisher: name: arXiv
Year: 2020
Subjects: subject: Number Theory (math.NT)
subject: FOS: Mathematics

description: For an elliptic curve $E$ defined over a field $k\subset \mathbb C$, we study iterated path integrals of logarithmic differential forms on $E^\dagger$, the universal vectorial extension of $E$. These are generalizations of the classical periods and quasi-periods of $E$, and are closely related to multiple elliptic polylogarithms and elliptic multiple zeta values. Moreover, if $k$ is a finite extension of $\mathbb Q$, then these iterated integrals along paths between $k$-rational points are periods in the sense of Kontsevich--Zagier.
description: 12 pages; for proceedings of workshop "Various aspects of multiple zeta values", RIMS, Kyoto, Japan, 18th-22nd. November. 2019
Atom Cloud Detection Using a Deep Neural Network
Creators: name: Hofer, Lucas R.
name: Krstajić, Milan
name: Juhász, Péter
name: Marchant, Anna L.
name: Smith, Robert P.
Publisher: name: arXiv
Year: 2020
Subjects: subject: Quantum Gases (cond-mat.quant-gas)
subject: Atomic Physics (physics.atom-ph)
subject: FOS: Physical sciences

description: We use a deep neural network to detect and place region-of-interest boxes around ultracold atom clouds in absorption and fluorescence images---with the ability to identify and bound multiple clouds within a single image. The neural network also outputs segmentation masks that identify the size, shape and orientation of each cloud from which we extract the clouds' Gaussian parameters. This allows 2D Gaussian fits to be reliably seeded thereby enabling fully automatic image processing.
Dynamics of radiatively inefficient flows accreting onto radiatively efficient black hole objects
Creators: name: Proga, Daniel
Publisher: name: arXiv
Year: 2006
Subjects: subject: Astrophysics (astro-ph)
subject: FOS: Physical sciences

description: I present results from numerical simulations of gas dynamics outside luminous accretion disks in active galactic nuclei. The gas, gravitationally captured by a super massive black hole, can be driven away by the energy and momentum of the radiation emitted during black hole accretion. Assuming axisymmetry, I study how the mass accretion and outflow rates, and the flow dynamics respond to changes in radiation heating relative to radiation pressure. I find that for a 10^8 MSUN black hole with the accretion luminosity of 0.6 of the Eddington luminosity the flow settles into a steady state and has two components: (1) an equatorial inflow and (2) a bipolar inflow/outflow with the outflow leaving the system along the disk rotational axis. The inflow is a realization of a Bondi-like accretion flow. The second component is an example of a non-radial accretion flow which becomes an outflow once it is pushed close to the rotational axis where thermal expansion and radiation pressure accelerate it outward. The main result of this preliminary work is that although the above two-component solution is robust, its properties are sensitive to the geometry and spectral energy distribution of the radiation field.
description: to appear in "Black Holes: from Stars to Galaxies" Proceedings IAU Symp. No. 238, eds. V. Karas & G. Matt, 4 pages, 1 figure, needs iaus.cls
Pseudoplatyophrya saltans Foissner 1988
Creators: name: Durán-Ramírez, Carlos Alberto
name: Dias, Roberto Júnio Pedroso
name: Estrada, Rosaura Mayén-
Publisher: name: Zenodo
Year: 2020
Subjects: Biodiversity
Taxonomy
Chromista
Ciliophora
Colpodea
Grossglockneriida
Grossglockneriidae
Pseudoplatyophrya
Pseudoplatyophrya saltans

description: Pseudoplatyophrya saltans Foissner, 1988
Distribution. VENEZUELA: South margin of the Henri Pittier National Park, Biological Station Rancho Grande (Foissner 2016).
description: Published as part of Durán-Ramírez, Carlos Alberto, Dias, Roberto Júnio Pedroso & Estrada, Rosaura Mayén-, 2020, Checklist of ciliates (Alveolata: Ciliophora) that inhabit in bromeliads from the Neotropical Region, pp. 1-36 in Zootaxa 4895 (1) on page 24, DOI: 10.11646/zootaxa.4895.1.1, http://zenodo.org/record/4321437
Jehle-Wildberger, Marianne, Adolf Keller 1872-1963
Creators: name: Müller-Fahrenholz, Geiko
Publisher: name: Ökumenische Rundschau
Year: 2025

description: Ökumenische Rundschau, Bd. 58 Nr. 2 (2009): Ökumenische Rundschau, Band 58, Heft 2
Low energy effective field theories of fermion liquids and mixed $U(1)\times \mathbb{R}^d$ anomaly
Creators: name: Wen, Xiao-Gang
Publisher: name: arXiv
Year: 2021
Subjects: subject: Strongly Correlated Electrons (cond-mat.str-el)
subject: FOS: Physical sciences

description: In this paper we study gapless fermionic and bosonic systems in $d$-dimensional continuum space with $U(1)$ particle-number conservation and $\mathbb{R}^d$ translation symmetry. We write down low energy effective field theories for several gapless phases where $U(1)\times \mathbb{R}^d$ is viewed as internal symmetry. The $U(1)\times \mathbb{R}^d$ symmetry, when viewed as an internal symmetry, has a mixed anomaly, and the different effective field theories for different phases must have the same mixed anomaly. Such a mixed anomaly is proportional to the particle number density, and can be measured from the distribution of the total momentum $\boldsymbol{k}_\text{tot}$ for low energy many-body states (\ie how such a distribution is shifted by $U(1)$ symmetry twist $\boldsymbol{a}$), as well as some other low energy universal properties of the systems. In particular, we write down low energy effective field theory for Fermi liquid with infinite number of fields, in the presence of both real space magnetic field and $\boldsymbol{k}$-space "magnetic" field. The effective field theory also captures the mixed anomaly, which constraints the low energy dynamics, such as determine the volume of Fermi surface (which is another formulation of Luttinger-Ward-Oshikawa theorem).
description: 14 pages and 3 figures. Added effective field theory for Fermi liquid with real space and k-space magnetic fields
Elicitation of verbs from "Creation of Animals"
Creators: name: Parker, Verdena
name: Newbold, Lindsey
name: Spence, Justin
Publisher: name: California Language Archive, University of California, Berkeley
Year: 2022
Subjects: subject: hup

description: Audio file VP-290811-07: Elicitation of verbs from the "Creation of Animals" story (file VP-080309-03), focused on items that are not in the Hupa Language Dictionary.
A rest area on Main Street in Blue River, B.C.
Creators: name: Osenton, Nicolas Simon
Publisher: name: University of British Columbia
Year: 2009

description: The Blue River Rest Area is a study of the marginal condition of the roadside. It is placed within a town as a strategy for improving both the road and the roadside community through a cross fertilization of experiences and economies. Blue River is an accumulation of services responding to the infrastructure links running through the North Thompson valley. These include the Yellowhead Highway, the Canadian National Railway, the Trans Mountain Oil Pipeline and a power transmission corridor. The town remains isolated from the highway through berming and a system of largely unused frontage roads. As a margin between the highway and the town park space, this rest area is an investigation of perspective and ground. It seeks to mediate the relationship between the view from the road, the view of the resting traveler, and the experiences of the facility from the town itself. The picturesque notion of the road passing through a natural landscape is physically imbedded in the site through a blurring of distinction between land, roadside, and roadside facility. The rest area attempts to exploit the discrepancies between the views and eye levels of the different user groups and to find resolution in disparate, possibly intimidating elements through the creation of new vantages and vistas. It attempts to use overscale and even ugly elements of the road to create unexpected opportunities for rest and reflection.
CPT/Lorentz Invariance Violation and Quantum Field Theory
Creators: name: Arias, Paola
name: Das, Ashok
name: Gamboa, Jorge
name: Lopez-Sarrion, Justo
name: Mendez, Fernando
Publisher: name: arXiv
Year: 2006
Subjects: subject: High Energy Physics - Theory (hep-th)
subject: FOS: Physical sciences

description: Analogies between the noncommutative harmonic oscillator and noncommutative fields are analyzed. Following this analogy we construct examples of quantum fields theories with explicit CPT and Lorentz symmetry breaking. Some applications to baryogenesis and neutrino oscillation are also discussed
description: Contribution to the Fifth International Conference on Mathematical Methods in Physics, Rio de Janeiro, April 24-28 2006
MERCURY INTRUSION POROSIMETRY TO EVALUATE THE INCIDENCE OF BIOTURBATION ON POROSITY OF CONTOURITES
Creators: name: J. RODRÍGUEZ-TOVAR, FRANCISCO
name: MIGUEZ-SALAS, OLMO
name: DORADOR, JAVIER
Publisher: name: RIVISTA ITALIANA DI PALEONTOLOGIA E STRATIGRAFIA
Year: 2021

description: The effect of bioturbation on rocks’ flow-media properties (e.g., porosity and permeability) and its impact on reservoir quality has been previously documented. However, the occurrence of ichnological features and their impact on rock properties in contourite deposits, a facies of economic interest, is poorly known. The study evaluates the effects of bioturbation on different types of contourite facies, particularly dominantly calcareous contourites and sandy clastic contourites, using mercury intrusion porosimetry. Porosity (total, intraparticle and interparticle) is characterized in selected samples, comparing the host rock with the infills of the trace fossils; Macaronichnus, Parahaentzschelinia and Scolicia from El Adergha and Kirmta sections in Morocco, and Chondrites, Planolites and Thalassinoides from Petra Tou Romiou, Agios Konstantinos, and Kalavassos outcrops in Cyprus. The obtained data reveal variance between porosities according to different types of contourite facies and trace fossils. Total porosity shows similar values for the host sediment in clastic and calcarenitic contourites, but interparticle porosity is nearly absent in calcarenitic contourites, where intraparticle porosity is almost exclusive. This is owing to the abundance of foraminifera chambers that increase intraparticle primary porosity. Regarding the ichnotaxa, higher total porosity values were obtained from the infilling material of Parahaentzschelinia, Scolicia and Macaronichnus, which could be related with the redistribution of grains by trace makers during feeding activity. Considering the impact of bioturbation on reservoir quality, there are significant differences between clastic and calcareous contourites. In the clastic contourites, bioturbation increases in the total porosity, particularly interparticle porosity, suggesting a positive impact for the reservoir properties of the studied units. However, in calcarenitic and muddy chalk contouritic facies, bioturbation has a minor effect on porosity and no predictable influence on the flow-media characteristics.
description: RIVISTA ITALIANA DI PALEONTOLOGIA E STRATIGRAFIA , V. 127 N. 1 (2021)
Von der ökumenischen Friedensfahrt 1908 zur Bildung der ACK 1948
Creators: name: Voigt, Karl Heinz
Publisher: name: Ökumenische Rundschau
Year: 2025

description: Ökumenische Rundschau, Bd. 58 Nr. 2 (2009): Ökumenische Rundschau, Band 58, Heft 2
Automated approach to measure stellar inclinations: validation through large-scale measurements on the red giant branch
Creators: name: Gehan, C.
name: Mosser, B.
name: Michel, E.
name: Cunha, M. S.
Publisher: name: arXiv
Year: 2020
Subjects: subject: Solar and Stellar Astrophysics (astro-ph.SR)
subject: FOS: Physical sciences

description: Measuring stellar inclinations is fundamental to understand planetary formation and dynamics as well as physical conditions during star formation. Oscillation spectra of red giant stars exhibit mixed modes that have both a gravity component from the radiative interior and a pressure component from the convective envelope. Gravity-dominated (g-m) mixed modes split by rotation are well separated inside frequency spectra, making possible accurate measurements of stellar inclinations. This work aims at developing an automated and general approach to measure stellar inclinations, that can be applied to any solar-type pulsator for which oscillation modes are identified, and at validating it using red giant branch stars observed by Kepler. We use the mean height-to-background ratio of dipole mixed modes with different azimuthal orders to measure stellar inclinations. The underlying statistical distribution of inclinations is recovered in an unbiased way using a probability density function for the stellar inclination angle. We derive stellar inclination measurements for 1139 stars on the red giant branch, for which Gehan et al. (2018) have identified the azimuthal order of dipole g-m mixed modes. Raw measured inclinations exhibit strong deviation with respect to isotropy which is expected for random inclinations over the sky. When taking uncertainties into account, the reconstructed distribution of inclinations actually follows the expected isotropic distribution of the rotational axis. This work highlights the biases that affect inclination measurements and provides the way to infer their underlying statistical distribution. When the star is seen either pole-on or equator-on, measurements are challenging and result in a biased distribution. Correcting biases that appear at the low- and high inclination regimes allows us to recover the underlying inclination distribution.
description: 35 pages, accepted for publication in A&A
A NEW LARGE-SIZED PLIOCENE FOX (CARNIVORA, CANIDAE) FROM YUSHE BASIN (SHANXI, CHINA)
Creators: name: BARTOLINI LUCENTI, SAVERIO
Publisher: name: RIVISTA ITALIANA DI PALEONTOLOGIA E STRATIGRAFIA
Year: 2021

description: The Yushe Basin (Shanxi, China) represent one of the most renowned location of China for Uppest Miocene-Lower Pleistocene fossiliferous beds, with an outstanding record of vertebrates, often reference to other Asian localities. Fossils from the town of Xiakou are considered among the oldest records (late Gaozhuang-earliest Mazegouan) of Eucyon davisi in the Basin. Nevertheless, the study of some Early Pliocene specimens of this sample attributed to E. davisi possess several features typical of Vulpes. The revision of this material in comparison with that of other fossil fox species from Asia revealed the peculiarity of the Vulpes from Xiakou, both metrically and morphologically, leading to the description of a new species, Vulpes rooki sp. nov. Dental features and proportions suggest that this large-sized fox had probably a hypercarnivorous diet, unlike the similar-sized E. davisi. Following other results in literature, the considerably diverse fossil record of canids in the Yushe Basin supports the interpretation of niche partitioning among these species during the Early Pliocene.
description: RIVISTA ITALIANA DI PALEONTOLOGIA E STRATIGRAFIA , V. 127 N. 1 (2021)
Small-x Dipole Evolution Beyond the Large-N_c Limit
Creators: name: Avsar, Emil
name: Gustafson, Gosta
name: Lonnblad, Leif
Publisher: name: arXiv
Year: 2006
Subjects: subject: High Energy Physics - Phenomenology (hep-ph)
subject: FOS: Physical sciences

description: We present a method to include colour-suppressed effects in the Mueller dipole picture. The model consistently includes saturation effects both in the evolution of dipoles and in the interactions of dipoles with a target in a frame-independent way. When implemented in a Monte Carlo simulation together with our previous model of energy--momentum conservation and a simple dipole description of initial state protons and virtual photons, the model is able to reproduce to a satisfactory degree both the gamma*-p cross sections as measured at HERA as well as the total p-p cross section all the way from ISR energies to the Tevatron and beyond.
Weak quasi-factorization for the Belavkin-Staszewski relative entropy
Creators: name: Bluhm, Andreas
name: Capel, Ángela
name: Pérez-Hernández, Antonio
Publisher: name: arXiv
Year: 2021
Subjects: subject: Mathematical Physics (math-ph)
subject: Quantum Physics (quant-ph)
subject: FOS: Physical sciences

description: Quasi-factorization-type inequalities for the relative entropy have recently proven to be fundamental in modern proofs of modified logarithmic Sobolev inequalities for quantum spin systems. In this paper, we show some results of weak quasi-factorization for the Belavkin-Staszewski relative entropy, i.e. upper bounds for the BS-entropy between two bipartite states in terms of the sum of two conditional BS-entropies, up to some multiplicative and additive factors.
description: 12 pages, 1 figure
Spatially resolved spectroscopy of planetary nebulae and their halos I. Five galactic disk objects
Creators: name: Sandin, Christer
name: Schönberner, Detlef
name: Roth, Martin M.
name: Steffen, Matthias
name: Böhm, Petra
name: Monreal-Ibero, Ana
Publisher: name: arXiv
Year: 2008
Subjects: subject: Astrophysics (astro-ph)
subject: FOS: Physical sciences

description: Strong mass loss off stars at the tip of the asymptotic giant branch (AGB) profoundly affects properties of these stars and their surroundings, including the subsequent planetary nebula (PN) stage. With this study we wanted to determine physical properties of mass loss by studying weakly emitting halos, focusing on objects in the galactic disk. Halos surround the, up to several thousand times, brighter central regions of PNe. Young halos, specifically, still contain information of the preceeding final mass loss stage on the AGB. In the observations we used the method of integral field spectroscopy with the PMAS instrument. This is the first committed study of halos of PNe that uses this technique. We improved our data analysis by a number of steps. In a study of the influence of scattered light we found that a moderate fraction of intensities in the inner halo originate in adjacent regions. As we combine line intensities of distant wavelengths, and because radial intensity gradients are steep, we corrected for effects of differential atmospheric refraction. In order to increase the signal-to-noise of weak emission lines we introduced a dedicated method to bin spectra of individual spatial elements. We also developed a general technique to subtract telluric lines - without using separate sky exposures. By these steps we avoided introducing errors of several thousand Kelvin to our temperature measurements in the halo. For IC3568 we detected a halo. For M2-2 we found a halo radius that is 2.5 times larger... (abridged)
description: 27 pages, 29 figures, A&A (in press), Abridged abstract, Corrected and clarified various minor issues; the section on scattered light is significantly clarified
Single atom adhesion in optimized gold nanojunctions
Creators: name: Trouwborst, M. L.
name: Huisman, E. H.
name: Bakker, F. L.
name: van der Molen, S. J.
name: van Wees, B. J.
Publisher: name: arXiv
Year: 2008
Subjects: subject: Mesoscale and Nanoscale Physics (cond-mat.mes-hall)
subject: FOS: Physical sciences

description: We study the interaction between single apex atoms in a metallic contact, using the break junction geometry. By carefully 'training' our samples, we create stable junctions in which no further atomic reorganization takes place. This allows us to study the relation between the so-called jump out of contact (from contact to tunnelling regime) and jump to contact (from tunnelling to contact regime) in detail. Our data can be fully understood within a relatively simple elastic model, where the elasticity k of the electrodes is the only free parameter. We find 5 < k < 32 N/m. Furthermore, the interaction between the two apex atoms on both electrodes, observed as a change of slope in the tunnelling regime, is accounted for by the same model.
Operando optical tracking of single-particle ion dynamics and phase transitions in battery electrodes
Creators: name: Merryweather, Alice J.
name: Schnedermann, Christoph
name: Jacquet, Quentin
name: Grey, Clare P.
name: Rao, Akshay
Publisher: name: arXiv
Year: 2020
Subjects: subject: Materials Science (cond-mat.mtrl-sci)
subject: FOS: Physical sciences

description: Key to advancing lithium-ion battery technology, and in particular fast charging capabilities, is our ability to follow and understand the dynamic processes occurring in operating materials under realistic conditions, in real time, and on the nano- to meso-scale. Currently, operando imaging of lithium-ion dynamics requires sophisticated synchrotron X-ray or electron microscopy techniques, which do not lend themselves to high-throughput material screening. This limits rapid and rational materials improvements. Here we introduce a simple lab-based, optical interferometric scattering microscope to resolve nanoscopic lithium-ion dynamics in battery materials and apply it to follow the repeated cycling of the archetypical cathode material Li$_\textit{x}$CoO$_2$. The method allows us to visualise directly the insulator-metal, solid solution and lithium ordering phase transitions in this material. We determine rates of lithium insertion and removal at the single-particle level and identify different mechanisms that occur on charge vs. discharge. Finally, we capture the dynamic formation of domain boundaries between different crystal orientations associated with the monoclinic lattice distortion at around Li$_{0.5}$CoO$_2$. The high throughput nature of our methodology allows many particles to be sampled across the entire electrode and, moving forward, will enable exploration of the role of dislocations, morphologies and cycling rate on battery degradation. The generality of our imaging concept means that it can be applied to study any battery electrode, and more broadly, systems where the transport of ions is associated with electronic or structural changes, including nanoionic films, ionic conducting polymers, photocatalytic materials and memristors.
description: 18 pages, including 5 figures
Neutrino Observables from a U(2) Flavor Symmetry
Creators: name: Linster, Matthias
name: Lopez-Pavon, Jacobo
name: Ziegler, Robert
Publisher: name: arXiv
Year: 2020
Subjects: subject: High Energy Physics - Phenomenology (hep-ph)
subject: FOS: Physical sciences

description: We study the predictions for CP phases and absolute neutrino mass scale for broad classes of models with a U(2) flavor symmetry. For this purpose we consider the same special textures in neutrino and charged lepton mass matrices that are succesful in the quark sector. While in the neutrino sector the U(2) structure enforces two texture zeros, the contribution of the charged lepton sector to the PMNS matrix can be parametrized by two rotation angles. Restricting to the cases where at least one of these angles is small, we obtain three representative scenarios. In all scenarios we obtain a narrow prediction for the sum of neutrino masses in the range of 60$-$75 meV, possibly in the reach of upcoming galaxy survey experiments. All scenarios can be excluded if near-future experimental date provide evidence for either neutrinoless double-beta decay or inverted neutrino mass ordering.
description: 8 pages, 4 figures
Screening High-z GRBs with BAT Prompt Emission Properties
Creators: name: Ukwatta, T. N.
name: Sakamoto, T.
name: Stamatikos, M.
name: Gehrels, N.
name: Dhuga, K. S.
Publisher: name: arXiv
Year: 2008
Subjects: subject: Astrophysics (astro-ph)
subject: FOS: Physical sciences

description: Detecting high-z GRBs is important for constraining the GRB formation rate, and tracing the history of re-ionization and metallicity of the universe. Based on the current sample of GRBs detected by Swift with known redshifts, we investigated the relationship between red-shift, and spectral and temporal characteristics, using the BAT event-by-event data. We found red-shift trends for the peak-flux-normalized temporal width T90, the light curve variance, the peak flux, and the photon index in simple power-law fit to the BAT event data. We have constructed criteria for screening GRBs with high red-shifts. This will enable us to provide a much faster alert to the GRB community of possible high-z bursts.
description: 4 pages, 4 figures, to be published in the proceedings of ''Gamma Ray Bursts 2007'', Santa Fe, New Mexico, November 5-9
Magnetoelastic Effects and Magnetic Phase Diagram of Multiferroic $DyMn_2O_5$
Creators: name: Cruz, C. R. dela
name: Lorenz, B.
name: Sun, Y. Y.
name: Chu, C. W.
name: Park, S.
name: Cheong, S. -W.
Publisher: name: arXiv
Year: 2006
Subjects: subject: Strongly Correlated Electrons (cond-mat.str-el)
subject: Materials Science (cond-mat.mtrl-sci)
subject: FOS: Physical sciences

description: The magnetoelastic coupling in multiferroic $DyMn_2O_5$ is investigated by magnetostriction measurements along the three crystallographic orientations. Strong lattice anomalies as a function of the magnetic field are detected at the low temperature magnetic and ferroelectric phase transitions. The sign and magnitude of the magnetostrictive coefficient as well as the lattice anomalies at the transitions are correlated with the Dy moment order and with the sharp changes of the dielectric constant and the ferroelectric polarization. With the magnetic field applied along the c-axis a new high-field phase has been detected the magnetic structure of which has yet to be explored.
title: Rapid Computational Aerodynamics for Aircraft Gust Response Analysis
Creators: name: Bekemeyer, P
Publisher: name: University of Liverpool Repository
Year: 2018

description: Computational engineering methods play a more and more important role in building aircraft that move people and goods. Particular in high-speed civil air transport increased usage of higher fidelity simulation tools are expected to enable greener designs with a reduced environmental footprint. The challenge of including computational fluid dynamics in aircraft loads and aeroelasticity is addressed herein. During the aircraft design and certification process a tremendous number of dynamic responses to atmospheric turbulence need to be analysed. Current industrial loads computations are based on corrected linear potential flow methods which offer fast predictions but suffer several drawbacks once aerodynamic non-linearities occur. Instead, aerodynamic loads offered by computational fluid dynamics are highly accurate also at these non-linear conditions. However, computational cost necessary for performing time-marching simulations makes these methods prohibitive for unsteady loads in an industrial context. This work addresses how to efficiently introduce computational fluid dynamics based aerodynamics during gust loads analysis. It is shown that using frequency domain methods in conjunction with reduced order modelling techniques based on modal decomposition and projection offer accurate models which can be analysed at low cost. The three requirements of such an industrial gust loads process are, first, the need for high accuracy, secondly, a significant reduction of runtime compared to unsteady full order time-marching simulations, and thirdly, the ability to automatise the generation and solution process of the reduced model as well as the design and certification process. Therefore, the linearised frequency domain method is extended towards gust responses by altering the right-hand side forcing term. An aerodynamic reduced order model is constructed by computing a modal basis using proper orthogonal decomposition and projecting the linearised equations afterwards. Finally, a coupled aeroelastic model is obtained by combining the aerodynamics model with eigenmodes of the coupled Jacobian matrix for the structural vibration and projecting the coupled linearised equations. The final small sized aeroelastic model enables the inclusion of highly accurate loads during time-critical gust loads analysis and provides the opportunity to introduce these loads in a wider multidisciplinary context. Thus it is a substantial step towards establishing computational fluid dynamics for unsteady aeroelastic analysis.
Decentralized Motion Planning for Multi-Robot Navigation using Deep Reinforcement Learning
Creators: name: Kandhasamy, Sivanathan
name: Kuppusamy, Vinayagam Babu
name: Samak, Tanmay Vilas
name: Samak, Chinmay Vilas
Publisher: name: arXiv
Year: 2020
Subjects: subject: Robotics (cs.RO)
subject: Artificial Intelligence (cs.AI)
subject: Machine Learning (cs.LG)
subject: Multiagent Systems (cs.MA)
subject: Neural and Evolutionary Computing (cs.NE)
subject: FOS: Computer and information sciences

description: This work presents a decentralized motion planning framework for addressing the task of multi-robot navigation using deep reinforcement learning. A custom simulator was developed in order to experimentally investigate the navigation problem of 4 cooperative non-holonomic robots sharing limited state information with each other in 3 different settings. The notion of decentralized motion planning with common and shared policy learning was adopted, which allowed robust training and testing of this approach in a stochastic environment since the agents were mutually independent and exhibited asynchronous motion behavior. The task was further aggravated by providing the agents with a sparse observation space and requiring them to generate continuous action commands so as to efficiently, yet safely navigate to their respective goal locations, while avoiding collisions with other dynamic peers and static obstacles at all times. The experimental results are reported in terms of quantitative measures and qualitative remarks for both training and deployment phases.
description: Accepted at IEEE International Conference on Intelligent Sustainable Systems (ICISS) 2020
title: Building a purposive approach to UK labour law
Creators: name: Glazer, Alan H.
Publisher: name: University of Glasgow
Year: 2021
Subjects: subject: Judicial reasoning, legal theory, labour law, purposive interpretation, UK Supreme Court, Uber v Aslam.

description: This thesis stresses the need for a reconceptualization of the judicial role in UK labour law. It will be argued that a purposive approach is the most appropriate approach for judges to take in this respect. Indeed, there has been an increasing willingness to use the purposive approach, using non-EU-derived legal sources, by the UK Supreme Court in labour law cases. It will be argued that a change in approach, as described, has the potential to redress the power imbalance in the employment relationship and mitigate the adverse effects progresses, with reference to the theories of Aharon Barak, Guy Davidov, Ronald Dworkin and labour law cases in the House of Lords and UK Supreme Court. The thesis will use this model to make a descriptive and normative assessment of how the UK Supreme Court should decide Uber v Aslam.
Transcription of "Coyote, Little Owl, and Two-Neck"
Creators: name: Parker, Verdena
name: Newbold, Lindsey
Publisher: name: California Language Archive, University of California, Berkeley
Year: 2022
Subjects: subject: hup

description: Audio file VP-290811-06: Transcription of the story of Coyote, Little Owl, and the giant Two-Neck (file VP-221006-01), from the beginning of the story to 3:56.
Study of $η$ photoproduction on the proton in a chiral constituent quark approach via one-gluon-exchange model
Creators: name: He, Jun
name: Saghai, B.
name: Li, Zhenping
Publisher: name: arXiv
Year: 2008
Subjects: subject: Nuclear Theory (nucl-th)
subject: FOS: Physical sciences

description: A formalism based on a chiral quark model ($χ$QM) approach complemented with a one-gluon exchange model, to take into account the breakdown of the $SU(6)\otimes O(3)$ symmetry, is presented. The configuration mixing of wave functions for nucleon and resonances are derived. % With few adjustable parameters, differential cross-section and polarized beam asymmetry for the $γp \to ηp$ process are calculated and successfully compared with the data in the centre-of-mass energy range from threshold up to 2 GeV. The known resonances $S_{11}(1535)$, $S_{11}(1650)$, $P_{13}(1720)$, $D_{13}(1520)$, and $F_{15}(1680)$, as well as two new $S_{11}$ and $D_{15}$ resonances are found to be dominant in the reaction mechanism. Besides, connections among the scattering amplitudes of the $χ$QM approach and the helicity amplitudes, as well as decay widths of resonances are established. Possible contributions from the so-called "missing resonances" are investigated and found to be negligible.
description: 25 pages,3 figures
Evidence for Charge Glass-like Behavior in Lightly Doped La_{2-x}Sr_{x}CuO_{4} at Low Temperatures
Creators: name: Raicevic, I.
name: Jaroszynski, J.
name: Popovic, Dragana
name: Panagopoulos, C.
name: Sasagawa, T.
Publisher: name: arXiv
Year: 2008
Subjects: subject: Strongly Correlated Electrons (cond-mat.str-el)
subject: FOS: Physical sciences

description: A c-axis magnetotransport and resistance noise study in La_{1.97}Sr_{0.03}CuO_{4} reveals clear signatures of glassiness, such as hysteresis, memory, and slow, correlated dynamics, but only at temperatures (T) well below the spin glass transition temperature T_{sg}. The results strongly suggest the emergence of charge glassiness, or dynamic charge ordering, as a result of Coulomb interactions.
description: title changed, presentation improved, references added; to appear in Phys. Rev. Letters
Digital Authentication for Wireless Domain Using Variable Marking of Multiple Secret Signatures and its Practical Implication in E-Stamp Authentication
Creators: name: Gangwar, Mohit
Publisher: name: figshare
Year: 2024
Subjects: classificationCode: 461104
subject: Neural networks

description: The work emphasizing dynamic authentications for transmitted e-documents like e-stamp paper under wireless environments through variable circular concealment of multiple invisible signature images governed by the encryption of secret key and the session random number. Additionally region wise separate bit casting strategy and dynamical bit sequencing concepts for multiple signatures ensuring greater security and robustness. Additional multi-copy signature marking on all non-overlapping areas of the document cover image, along with noticeably varied bit encoding strategies on each modified pixel byte coefficient for the cover image sub blocks, essentially improve protection and signature recovery from attacks. The reverse transformed bit coded pixel byte components for the sub blocks within the spatial domain ranges are maintained while the threshold range driven bit creation notion operates admirably under attacks. Finally, since all the secret information and the random number are likewise provided to the receiver, the securely marked signature bits may then be recognized there in the appropriate relevant ordering from the corresponding forward transformed sub block pixel byte elements. Significantly improved performance of our system in contrast to earlier efforts has been proven by significant experimental results, which also highlight solid trusted authentication and confidentiality scenarios as the key security issues.
Modeling Spitzer observations of VV Ser. I. The circumstellar disk of a UX Orionis star
Creators: name: Pontoppidan, Klaus M.
name: Dullemond, Cornelis P.
name: Blake, Geoffrey A.
name: Boogert, A. C. Adwin
name: van Dishoeck, Ewine F.
name: Evans, Neal J.
name: Kessler-Silacci, Jacqueline
name: Lahuis, Fred
Publisher: name: arXiv
Year: 2006
Subjects: subject: Astrophysics (astro-ph)
subject: FOS: Physical sciences

description: We present mid-infrared Spitzer-IRS spectra of the well-known UX Orionis star VV Ser. We combine the Spitzer data with interferometric and spectroscopic data from the literature covering UV to submillimeter wavelengths. The full set of data are modeled by a two-dimensional axisymmetric Monte Carlo radiative transfer code. The model is used to test the prediction of (Dullemond et al. 2003) that disks around UX Orionis stars must have a self-shadowed shape, and that these disks are seen nearly edge-on, looking just over the edge of a puffed-up inner rim, formed roughly at the dust sublimation radius. We find that a single, relatively simple model is consistent with all the available observational constraints spanning 4 orders of magnitude in wavelength and spatial scales, providing strong support for this interpretation of UX Orionis stars. The grains in the upper layers of the puffed-up inner rim must be small (0.01-0.4 micron) to reproduce the colors (R_V ~ 3.6) of the extinction events, while the shape and strength of the mid-infrared silicate emission features indicate that grains in the outer disk (> 1-2 AU) are somewhat larger (0.3-3.0 micron). From the model fit, the location of the puffed-up inner rim is estimated to be at a dust temperature of 1500 K or at 0.7-0.8 AU for small grains. This is almost twice the rim radius estimated from near-infrared interferometry. A best fitting model for the inner rim in which large grains in the disk mid-plane reach to within 0.25 AU of the star, while small grains in the disk surface create a puffed-up inner rim at ~0.7-0.8 AU, is able to reproduce all the data, including the near-infrared visibilities. [Abstract abridged]
description: 12 pages, accepted for publication in ApJ
Open Access Books in the Humanities and Social Sciences: an Open Access Altmetric Advantage
Creators: name: Taylor, Michael
Publisher: name: arXiv
Year: 2020
Subjects: subject: Digital Libraries (cs.DL)
subject: FOS: Computer and information sciences

description: The last decade has seen two significant phenomena emerge in research communication: the rise of open access (OA) publishing, and evidence of online sharing in the form of altmetrics. There has been limited examination of the effect of OA on online sharing for journal articles, and little for books. This paper examines the altmetrics of a set of 32,222 books (of which 5% are OA) and a set of 220,527 chapters (of which 7% are OA) indexed by the scholarly database Dimensions in the Social Sciences and Humanities. Both OA books and chapters have significantly higher use on social networks, higher coverage in the mass media and blogs, and evidence of higher rates of social impact in policy documents. OA chapters have higher rates of coverage on Wikipedia than their non-OA equivalents, and are more likely to be shared on Mendeley. Even within the Humanities and Social Sciences, disciplinary differences in altmetric activity are evident. The effect is confirmed for chapters, although sampling issues prevent the strong conclusion that OA facilitates extra attention at whole book level, the apparent OA altmetrics advantage suggests that the move towards OA is increasing social sharing and broader impact.
title: Evaluating impact of rain attenuation on space-borne GNSS Reflectometry wind speeds
Creators: name: Asgarimehr, Milad
name: Wickert, Jens
name: Reich, Sebastian
Publisher: name: Universität Potsdam
Year: 2021
Subjects: subject: 620 Ingenieurwissenschaften und zugeordnete Tätigkeiten

description: The novel space-borne Global Navigation Satellite System Reflectometry (GNSS-R) technique has recently shown promise in monitoring the ocean state and surface wind speed with high spatial coverage and unprecedented sampling rate. The L-band signals of GNSS are structurally able to provide a higher quality of observations from areas covered by dense clouds and under intense precipitation, compared to those signals at higher frequencies from conventional ocean scatterometers. As a result, studying the inner core of cyclones and improvement of severe weather forecasting and cyclone tracking have turned into the main objectives of GNSS-R satellite missions such as Cyclone Global Navigation Satellite System (CYGNSS). Nevertheless, the rain attenuation impact on GNSS-R wind speed products is not yet well documented. Evaluating the rain attenuation effects on this technique is significant since a small change in the GNSS-R can potentially cause a considerable bias in the resultant wind products at intense wind speeds. Based on both empirical evidence and theory, wind speed is inversely proportional to derived bistatic radar cross section with a natural logarithmic relation, which introduces high condition numbers (similar to ill-posed conditions) at the inversions to high wind speeds. This paper presents an evaluation of the rain signal attenuation impact on the bistatic radar cross section and the derived wind speed. This study is conducted simulating GNSS-R delay-Doppler maps at different rain rates and reflection geometries, considering that an empirical data analysis at extreme wind intensities and rain rates is impossible due to the insufficient number of observations from these severe conditions. Finally, the study demonstrates that at a wind speed of 30 m/s and incidence angle of 30 degrees, rain at rates of 10, 15, and 20 mm/h might cause overestimation as large as approximate to 0.65 m/s (2%), 1.00 m/s (3%), and 1.3 m/s (4%), respectively, which are still smaller than the CYGNSS required uncertainty threshold. The simulations are conducted in a pessimistic condition (severe continuous rainfall below the freezing height and over the entire glistening zone) and the bias is expected to be smaller in size in real environments.
description: Postprints der Universität Potsdam : Mathematisch-Naturwissenschaftliche Reihe; 1132
Dynamical Structure Factor and Spin-Density Separation for a Weakly-Interacting Two-Component Bose Gas
Creators: name: Chung, M. -C.
name: Bhattacherjee, A. B.
Publisher: name: arXiv
Year: 2008
Subjects: subject: Other Condensed Matter (cond-mat.other)
subject: FOS: Physical sciences

description: We show that spin-density separation in a Bose gas is not restricted to 1D but also occurs in higher dimension. The ratio ($α$) of the intra-species atom-atom interaction strength to the inter-species interaction strength, strongly influences the dynamics of spin-density separation and the elementary excitations. The density wave is phonon-like for all values of $α$. For $α<1$, spin wave is also phonon-like. The spin waves have a quadratic dispersion in the $α=1$ coupling regime, while in the phase separated regime ($α>1$) the spin waves are found to be damped. The dynamical structure factor (DSF) reveals two distinct peaks corresponding to the density and spin waves for $α\le 1$. For $α> 1$ there is only one DSF peak corresponding to the density wave.
description: 4 pages, 2 figures
A minimally informative likelihood approach to Bayesian inference and decision analysis
Creators: name: Yuan, Ao
Publisher: name: University of British Columbia
Year: 2009

description: For a given prior density, we minimize the Shannon Mutual Information between a parameter and the data, over a class of likelihoods defined by bounding a Bayes risk by a 'distortion parameter'. This gives a conditional distribution for the data given the parameter which provides optimal data compression, or equivalently, is minimally informative for a type of location parameter. These optimal likelihoods cannot, in general, be obtained in closed form. However, they can be found numerically. Moreover, we give two statistical senses in which the optimal likelihoods form parametric families which make the weakest possible assumptions on the data generating mechanism. In addition, we establish properties of this parametric family that characterize its behavior as the distortion parameter varies. We argue that the parametric families identified here may lead to a default technique for some settings in initial data analysis. We partially characterize the settings in which our techniques may be expected to provide useful answers. In particular, we argue that if one is interested in performing certain Bayesian hypothesis tests on a parameter that locates a typical region for the response, then our technique may provide weak but nevertheless useful inferences. We also investigated the robustness of inferences to modeling strategies for paired, blocked data.
Terminus: A Versatile Simulator for Space-based Telescopes
Creators: name: Edwards, Billy
name: Stotesbury, Ian
Publisher: name: arXiv
Year: 2021
Subjects: subject: Earth and Planetary Astrophysics (astro-ph.EP)
subject: Instrumentation and Methods for Astrophysics (astro-ph.IM)
subject: FOS: Physical sciences

description: Space-based telescopes offer unparalleled opportunities for characterising exoplanets, Solar System bodies and stellar objects. However, observatories in low Earth orbits (e.g. Hubble, CHEOPS, Twinkle and an ever increasing number of cubesats) cannot always be continuously pointed at a target due to Earth obscuration. For exoplanet observations consisting of transit, or eclipse, spectroscopy this causes gaps in the light curve, which reduces the information content and can diminish the science return of the observation. Terminus, a time-domain simulator, has been developed to model the occurrence of these gaps to predict the potential impact on future observations. The simulator is capable of radiometrically modelling exoplanet observations as well as producing light curves and spectra. Here, Terminus is baselined on the Twinkle mission but the model can be adapted for any space-based telescope and is especially applicable to those in a low-Earth orbit. Terminus also has the capability to model observations of other targets such as asteroids or brown dwarfs.
description: 20 pages, 16 figures. Accepted for publication in AJ
Modeling Spitzer observations of VV Ser. II. an extended quantum heated nebula and a disk shadow
Creators: name: Pontoppidan, Klaus M.
name: Dullemond, Cornelis P.
name: Blake, Geoffrey A.
name: Evans, Neal J.
name: Geers, Vincent C.
name: Harvey, Paul M.
name: Spiesman, William
Publisher: name: arXiv
Year: 2006
Subjects: subject: Astrophysics (astro-ph)
subject: FOS: Physical sciences

description: We present mid-infrared Spitzer IRAC and MIPS images of the UX Orionis star VV Ser and the surrounding cloud. The 5.6--70 micron images show bright, localized and nebulous emission extended over 4 arcmin centered on VV Ser. We interpret the nebulosity as being due to transiently heated grains excited by UV photons emitted by VV Ser. A companion paper describes how the physical structure of the VV Ser disk has been constrained using a wide range of observational data modeled by an axisymmetric Monte Carlo radiative transfer code. In this paper we employ the model to study the nebulosity surrounding VV Ser using quantum-heated PAH molecules and Very Small Grains (VSGs) consisting of amorphous carbon in the thermal cooling approximation. Imprinted on the nebulosity is a wedge-shaped dark band, centered on the star. We interpret this dark wedge as the shadow cast by the inner regions of a near-edge-on disk in UV light, allowing the PAHs to be excited only outside of this shadow. The presence of a disk shadow strongly constrains the inclination as well as the position angle of the disk. Although depending on the adopted PAH opacity, the abundance of PAHs in the surrounding cloud is constrained to 5+/-2% of the total dust mass, given the opacity. The extent of the nebulosity constrains the density of the gas surrounding the VV Ser disk to 500+/-200 cm-3 for a gas-to-dust ratio of 100. This low density suggests that the quantum heated material is not part of the original envelope of VV Ser and that it is rather a quiescent part of the Serpens molecular cloud that the star has passed into after being formed. [Abstract abridged]
description: 11 pages, accepted for publication in ApJ
Letter from [James Goldie] to J.E. McAllister and R.S. Dormer, September 22, 1929
Creators: name: Goldie, James
Publisher: name: The University of British Columbia
Year: 2017

description: Letter from James Goldie to R.S. Dormer and J.E. McAllister, dated September 22, 1929, regarding updates on the harvest yield.