cometadata/datacite-rtg-text-other-reclassification-records huggingface dataset:
Effective perfect fluids in cosmology
Creators: name: Ballesteros, Guillermo
name: Bellazzini, Brando
Publisher: name: arXiv
Year: 2012
Subjects: subject: High Energy Physics - Theory (hep-th)
subject: Cosmology and Nongalactic Astrophysics (astro-ph.CO)
subject: General Relativity and Quantum Cosmology (gr-qc)
subject: High Energy Physics - Phenomenology (hep-ph)
subject: FOS: Physical sciences

description: We describe the cosmological dynamics of perfect fluids within the framework of effective field theories. The effective action is a derivative expansion whose terms are selected by the symmetry requirements on the relevant long-distance degrees of freedom, which are identified with comoving coordinates. The perfect fluid is defined by requiring invariance of the action under internal volume-preserving diffeomorphisms and general covariance. At lowest order in derivatives, the dynamics is encoded in a single function of the entropy density that characterizes the properties of the fluid, such as the equation of state and the speed of sound. This framework allows a neat simultaneous description of fluid and metric perturbations. Longitudinal fluid perturbations are closely related to the adiabatic modes, while the transverse modes mix with vector metric perturbations as a consequence of vorticity conservation. This formalism features a large flexibility which can be of practical use for higher order perturbation theory and cosmological parameter estimation.
description: Matches JCAP version
Turismo educativo: Cultura in movimento
Creators: name: Mariotti, Alessia
name: Tarozzi, Massimiliano
Publisher: name: Alma Mater Studiorum - Università di Bologna
Year: 2021
Subjects: M-GGR/02 Geografia economico-politica
M-PED/01 Pedagogia generale e sociale
SH2 - Institutions, Values, Beliefs and Behaviour: Sociology, social anthropology, political science, law, communication, social studies of science and technology
SH3 - Environment, Space and Population: Environmental studies, geography, demography, migration, regional and urban studies

description: Viaggi di istruzione, visite guidate, vacanze-studio, campi estivi, settimane verdi sono alcune delle definizioni che riguardano iniziative scolastiche o extrascolastiche orientate a forme di “turismo educativo”. Si tratta di un fenomeno in espansione, almeno fino all’insorgere dell’emergenza sanitaria del 2020 e 2021, difficile da definire in termini oggettivi per la grande varietà delle esperienze, degli attori coinvolti e della loro gestione. A torto considerato un segmento minore, il turismo educativo nelle sue varie espressioni ha saputo conquistare un ruolo di primo piano non solo per le ricadute economiche (il solo turismo scolastico in Italia muoveva oltre quattro milioni di persone all’anno con un volume di circa un miliardo di euro prima della pandemia), ma anche nella formazione della cultura turistica delle nuove generazioni. Questo volume si pone l’obiettivo di fornire alcuni spunti di riflessione all’intersezione fra il mondo della ricerca da un lato e quello delle molte professionalità coinvolte nella costruzione di pratiche ed esperienze di turismo educativo dall’altro, ma cerca anche di colmare un vuoto presente sia negli studi pedagogici che in quelli turistici, rispetto alla pratica turistica ed al suo ruolo educativo per la società
Polarized proton+$^{4,6,8}$He elastic scattering with breakup effects in the eikonal approximation
Creators: name: Kaki, K.
name: Suzuki, Y.
name: Wiringa, R. B.
Publisher: name: arXiv
Year: 2012
Subjects: subject: Nuclear Theory (nucl-th)
subject: Nuclear Experiment (nucl-ex)
subject: FOS: Physical sciences

description: We study the elastic scattering of polarized protons from He isotopes. The central and spin-orbit parts of the optical potential are derived using the Glauber theory that can naturally take account of the breakup effect of the He isotopes. Both the differential cross section and the vector analyzing power for $p+^{4,6,8}$He scattering at 71 MeV are in reasonable agreement with experiment. Scattering observables at 300 MeV are predicted. The Pauli blocking effect is examined at 71 MeV.
description: 11 pages, 9 figures, published version revised by the erratum
Investigation of the dynamics of railway bogies subjected to traction/braking torque
Creators: name: Handoko, Yunendar
Publisher: name: CQUniversity
Year: 2017
Subjects: classificationCode: 401702
subject: Dynamics, vibration and vibration control

description: "The limitations of current simulation packages in addressing the true longitudinal behaviour of railway bogie dynamics during braking/traction has prompted the development of a Rail Bogie Dynamics (RBD) program in this thesis. The RBD program offers novel features for the calculation of the speed profile as a function of the brake torque as well as explicitly determining wheelset angular velocity. With such capability, the speed profile is no longer treated as an input calculated as a priori as required by most of the current simulation systems. The RBD program has been developed using a formulation that includes the wheelset pitch degree of freedom explicitly with a coordinate reference system that is fixed in space and time. The formulation has made the simulation of the bogie dynamics during braking/traction possible in a natural way using the brake/traction torque as the input and the resulting speed profile as the output without any need for working out the speed profile as a priori. Consequently, severe dynamics during braking such as the wheelset skid and the onset of wheel climb derailment can be modelled and critical parameters investigated using the RBD program. The RBD program has been validated, where possible, through a series of simulations using a commercial software package (VAMPIRE). For cases which cannot be simulated by VAMPIRE such as the wheelset skid, a novel experimental program has been designed and commissioned in the Heavy Testing Laboratory of the Central Queensland University as reported in this thesis. One of the possible applications of the RBD program in examining the effect of asymmetric brake shoe force in bogies equipped with one-side push brake shoe arrangement is illustrated in this thesis. It is believed that the model and RBD program will have significant benefit in understanding the true longitudinal behaviour of wagons in suburban passenger trains that operate under braking/ traction torques for most of their travel. Similar studies will also be useful to freight train wagon dynamics during entry and exit of speed restriction zones and tight curves." -- abstract.
Higgs-Yukawa model in chirally-invariant lattice field theory
Creators: name: Bulava, John
name: Gerhold, Philipp
name: Jansen, Karl
name: Kallarackal, Jim
name: Knippschild, Bastian
name: Lin, C. -J. David
name: Nagai, Kei-Ichi
name: Nagy, Attila
name: Ogawa, Kenji
Publisher: name: arXiv
Year: 2012
Subjects: subject: High Energy Physics - Lattice (hep-lat)
subject: High Energy Physics - Phenomenology (hep-ph)
subject: FOS: Physical sciences

description: Non-perturbative numerical lattice studies of the Higgs-Yukawa sector of the standard model with exact chiral symmetry are reviewed. In particular, we discuss bounds on the Higgs boson mass at the standard model top quark mass, and in the presence of heavy fermions. We present a comprehensive study of the phase structure of the theory at weak and very strong values of the Yukawa coupling as well as at non-zero temperature.
description: 23 pages, 13 figures. Invited review for the special issue of Advances in High Energy Physics (AHEP) on Very Heavy Quarks at the LHC. Published version
Optimal expulsion and optimal confinement of a Brownian particle with a switching cost
Creators: name: Dalang, Robert C.
name: Vinckenbosch, Laura
Publisher: name: arXiv
Year: 2012
Subjects: subject: Probability (math.PR)
subject: Optimization and Control (math.OC)
subject: FOS: Mathematics
subject: 93E20 (Primary) 60G40, 60J65 (Secondary)

description: We solve two stochastic control problems in which a player tries to minimize or maximize the exit time from an interval of a Brownian particle, by controlling its drift. The player can change from one drift to another but is subject to a switching cost. In each problem, the value function is written as the solution of a free boundary problem involving second order ordinary differential equations, in which the unknown boundaries are found by applying the principle of smooth fit. For both problems, we compute the value function, we exhibit the optimal strategy and we prove its generic uniqueness.
description: 25 pages, 2 figures
Development Of Astronomy Educational Resources: The Case Of Universe Awareness
Creators: name: Simionato, Silvia
name: Russo, Pedro
name: Galletta, Giuseppe
name: Miley, George
Publisher: name: Zenodo
Year: 2013
Subjects: astronomy
education

description: In this thesis we will study astronomy as a means to spread science education. We will illustrate how the popularisation of science, especially if introduced during childhood, plays an important role in improving the quality of life of the individual and the growth of the society in the long run, in particular for developing countries. Specically, we will discuss an international astronomy education and outreach programme: Universe Awareness - UNAWE.
The Ensemble Kalman Filter for Inverse Problems
Creators: name: Iglesias, Marco A.
name: Law, Kody J. H.
name: Stuart, Andrew M.
Publisher: name: arXiv
Year: 2012
Subjects: subject: Optimization and Control (math.OC)
subject: FOS: Mathematics

description: The Ensemble Kalman filter (EnKF) was introduced by Evensen in 1994 [10] as a novel method for data assimilation: state estimation for noisily observed time-dependent problems. Since that time it has had enormous impact in many application domains because of its robustness and ease of implementation, and numerical evidence of its accuracy. In this paper we propose the application of an iterative ensemble Kalman method for the solution of a wide class of inverse problems. In this context we show that the estimate of the unknown function that we obtain with the ensemble Kalman method lies in a subspace A spanned by the initial ensemble. Hence the resulting error may be bounded above by the error found from the best approximation in this subspace. We provide numerical experiments which compare the error incurred by the ensemble Kalman method for inverse problems with the error of the best approximation in A, and with variants on traditional least-squares approaches, restricted to the subspace A. In so doing we demonstrate that the ensemble Kalman method for inverse problems provides a derivative-free optimization method with comparable accuracy to that achieved by traditional least-squares approaches. Furthermore, we also demonstrate that the accuracy is of the same order of magnitude as that achieved by the best approximation. Three examples are used to demonstrate these assertions: inversion of a compact linear operator; inversion of piezometric head to determine hydraulic conductivity in a Darcy model of groundwater flow; and inversion of Eulerian velocity measurements at positive times to determine the initial condition in an incompressible fluid.
I. Mieck, P. Guillen (Hg.), Nachkriegsgesellschaften in Deutschland und Frankreich im 20. Jahrhundert/Sociétés d'après-guerre en France et en Allemagne au 20e siècle, 1998
Creators: name: Corbin, Anne-Marie
Publisher: name: Francia
Year: 2019

description: Francia, Bd. 27 Nr. 3 (2000)
The Slater approximation for Coulomb exchange effects in nuclear covariant density functional theory
Creators: name: Gu, Huai-Qiang
name: Liang, Haozhao
name: Long, Wen Hui
name: Van Giai, Nguyen
name: Meng, Jie
Publisher: name: arXiv
Year: 2012
Subjects: subject: Nuclear Theory (nucl-th)
subject: Nuclear Experiment (nucl-ex)
subject: FOS: Physical sciences

description: The relativistic local density approximation (LDA) for the Coulomb exchange functional in nuclear systems is presented. This approximation is composed of the well-known Slater approximation in the non-relativistic scheme and the corrections due to the relativistic effects. Its validity in finite nuclei is examined by comparing with the exact treatment of the Coulomb exchange term in the relativistic Hartree-Fock-Bogoliubov theory. The relativistic effects are found to be important and the exact Coulomb exchange energies can be reproduced by the relativistic LDA within 5% demonstrated by the semi-magic Ca, Ni, Zr, Sn, and Pb isotopes from proton drip line to neutron drip line.
description: 6 pages and 4 figures
Convergence analysis of explicit stabilized integrators for parabolic semilinear stochastic PDEs
Creators: name: Abdulle, Assyr
name: Bréhier, Charles-Edouard
name: Vilmart, Gilles
Publisher: name: arXiv
Year: 2021
Subjects: subject: Numerical Analysis (math.NA)
subject: Probability (math.PR)
subject: FOS: Mathematics
subject: 65C30, 60H35, 65L20

description: Explicit stabilized integrators are an efficient alternative to implicit or semi-implicit methods to avoid the severe timestep restriction faced by standard explicit integrators applied to stiff diffusion problems. In this paper, we provide a fully discrete strong convergence analysis of a family of explicit stabilized methods coupled with finite element methods for a class of parabolic semilinear deterministic and stochastic partial differential equations. Numerical experiments including the semilinear stochastic heat equation with space-time white noise confirm the theoretical findings.
description: Assyr Abdulle passed away on September 1st, 2021 prior to the revision of this paper. To appear in IMA Journal of Numerical Analysis
An Open-Source Low-Cost Mobile Robot System with an RGB-D Camera and Efficient Real-Time Navigation Algorithm
Creators: name: Kim, Taekyung
name: Lim, Seunghyun
name: Shin, Gwanjun
name: Sim, Geonhee
name: Yun, Dongwon
Publisher: name: arXiv
Year: 2021
Subjects: subject: Robotics (cs.RO)
subject: Systems and Control (eess.SY)
subject: FOS: Computer and information sciences
subject: FOS: Electrical engineering, electronic engineering, information engineering

description: Currently, mobile robots are developing rapidly and are finding numerous applications in the industry. However, several problems remain related to their practical use, such as the need for expensive hardware and high power consumption levels. In this study, we build a low-cost indoor mobile robot platform that does not include a LiDAR or a GPU. Then, we design an autonomous navigation architecture that guarantees real-time performance on our platform with an RGB-D camera and a low-end off-the-shelf single board computer. The overall system includes SLAM, global path planning, ground segmentation, and motion planning. The proposed ground segmentation approach extracts a traversability map from raw depth images for the safe driving of low-body mobile robots. We apply both rule-based and learning-based navigation policies using the traversability map. Running sensor data processing and other autonomous driving components simultaneously, our navigation policies perform rapidly at a refresh rate of 18 Hz for control command, whereas other systems have slower refresh rates. Our methods show better performances than current state-of-the-art navigation approaches within limited computation resources as shown in 3D simulation tests. In addition, we demonstrate the applicability of our mobile robot system through successful autonomous driving in an indoor environment.
description: Accepted to IEEE Access 2022. Project Github: https://github.com/shinkansan/2019-UGRP-DPoom Video: https://youtu.be/Li3-RlO28lk
A new practical framework for the stability analysis of perturbed saddle-point problems and applications
Creators: name: Hong, Qingguo
name: Kraus, Johannes
name: Lymbery, Maria
name: Philo, Fadi
Publisher: name: arXiv
Year: 2021
Subjects: subject: Numerical Analysis (math.NA)
subject: FOS: Mathematics
subject: 65N12, 65J05, 65F08, 65N30

description: In this paper we prove a new abstract stability result for perturbed saddle-point problems based on a norm fitting technique. We derive the stability condition according to Babuska's theory from a small inf-sup condition, similar to the famous Ladyzhenskaya-Babuska-Brezzi (LBB) condition, and the other standard assumptions in Brezzi's theory, in a combined abstract norm. The construction suggests to form the latter from individual fitted norms that are composed from proper seminorms. This abstract framework not only allows for simpler (shorter) proofs of many stability results but also guides the design of parameter-robust norm-equivalent preconditioners. These benefits are demonstrated on mixed variational formulations of generalized Poisson, Stokes, vector Laplace and Biot's equations.
An inverse problem for finite Sidon sets
Creators: name: Nathanson, Melvyn B.
Publisher: name: arXiv
Year: 2021
Subjects: subject: Number Theory (math.NT)
subject: FOS: Mathematics
subject: 11B13, 11B34, 11B75, 11P99

description: Here is a direct problem for Sidon sets: Given a linear form $φ= c_1 x_1 + \cdots + c_h x_h $, construct and describe sets $A$ that are Sidon sets for $φ$. This paper considers an inverse problem for Sidon sets: Given a set $A$, determine the linear forms $φ$ such that $A$ is a Sidon set for $φ$.
description: 7 pages; additional open problems and updated references
The Bose-Chowla argument for Sidon sets
Creators: name: Nathanson, Melvyn B.
Publisher: name: arXiv
Year: 2021
Subjects: subject: Number Theory (math.NT)
subject: FOS: Mathematics
subject: 11B13, 11B34, 11B75, 11P99

description: Let $h \geq 2$ and let ${ \mathcal A} = (A_1,\ldots, A_h)$ be an $h$-tuple of sets of integers. For nonzero integers $c_1,\ldots, c_h$, consider the linear form $φ= c_1 x_1 + c_2x_2 + \cdots + c_h x_h$. The \emph{representation function} $R_{ \mathcal{A},φ}(n)$ counts the number of $h$-tuples $(a_1,\ldots, a_h) \in A_1 \times \cdots \times A_h$ such that $φ(a_1,\ldots, a_h) = n$. The $h$-tuple $\mathcal{A}$ is a \emph{$φ$-Sidon system of multiplicity $g$} if $R_{\mathcal A,φ}(n) \leq g$ for all $n \in \mathbf{Z}$. For every positive integer $g$, let $F_{φ,g}(n)$ denote the largest integer $q$ such that there exists a $φ$-Sidon system $\mathcal {A} = (A_1,\ldots, A_h)$ of multiplicity $g$ with \[ A_i \subseteq [1,n] \qquad \text{and} \qquad |A_i| = q \] for all $i =1,\ldots, h$. It is proved that, for all linear forms $φ$, \[ \limsup_{n\rightarrow \infty} \frac{F_{φ,g}(n)}{n^{1/h}} < \infty \] and, for linear forms $φ$ whose coefficients $c_i$ satisfy a certain divisibility condition, \[ \liminf_{n\rightarrow\infty} \frac{F_{φ,h!}(n)}{n^{1/h}} \geq 1. \]
description: Minor changes; 10 pages
Geometry-induced phase transition in fluids: capillary prewetting
Creators: name: Yatsyshin, Petr
name: Savva, Nikos
name: Kalliadasis, Serafim
Publisher: name: arXiv
Year: 2012
Subjects: subject: Soft Condensed Matter (cond-mat.soft)
subject: FOS: Physical sciences

description: We report a new first-order phase transition preceding capillary condensation and corresponding to the discontinuous formation of a curved liquid meniscus. Using a mean-field microscopic approach based on the density functional theory we compute the complete phase diagram of a prototypical two-dimensional system exhibiting capillary condensation, namely that of a fluid with long-ranged dispersion intermolecular forces which is spatially confined by a substrate forming a semi-infinite rectangular pore exerting long-ranged dispersion forces on the fluid. In the T-mu plane the phase line of the new transition is tangential to the capillary condensation line at the capillary wetting temperature, Tcw. The surface phase behavior of the system maps to planar wetting with the phase line of the new transition, termed capillary prewetting, mapping to the planar prewetting line. If capillary condensation is approached isothermally with T>Tcw, the meniscus forms at the capping wall and unbinds continuously, making capillary condensation a second-order phenomenon. We compute the corresponding critical exponent for the divergence of adsorption.
description: 5 pages, 4 figures, 5 movies
C. Thurmann, Bibliotheca statistica: Politik, Staatsrecht und Zeitgeschichte in einer frühneuzeitlichen Bibliographie raisonnée, Nachdruck der Ausgabe Halle, 1701, hg. und eingeleitet von W. E. J. Weber. Mit einem Register von A. Wendlberger und Ch. Rohr,
Creators: name: Gantet, Claire
Publisher: name: Francia
Year: 2019

description: Francia, Bd. 29 Nr. 2 (2002)
Determining the structure of real-space entanglement spectrum from approximate conditional independence
Creators: name: Kim, Isaac H.
Publisher: name: arXiv
Year: 2012
Subjects: subject: Strongly Correlated Electrons (cond-mat.str-el)
subject: Quantum Physics (quant-ph)
subject: FOS: Physical sciences

description: We study the ground state of a gapped quantum many-body system whose entanglement entropy $S_A$ can be expressed as $S_A = a|\partial A| - γ$, where $a, γ$ are some constants and $|\partial A|$ is an area of the subsystem $A$. By using a recently proved operator extension of strong subadditivity of entropy,[I. H. Kim, J. Math. Phys. 53, 122204 (2012)] we show that certain linear combination of the real-space entanglement spectrum has a small correlation with almost any local operator. Our result implies that there exists a structure relating the real-space entanglement spectrum over different subsystems. Further, this structure is inherited from the generic property of the ground state alone, suggesting that the locality of the entanglement spectrum may be attributed to the area law of entanglement entropy.
description: 5 pages, 3 figures, added references. The conjecture in the original manuscript is now a theorem, see 1210.5190 . The new version reflects this change
Atkinson's formula for the mean square of $ζ(s)$ with an explicit error term
Creators: name: Simonič, Aleksander
name: Starichkova, Valeriia V.
Publisher: name: arXiv
Year: 2021
Subjects: subject: Number Theory (math.NT)
subject: FOS: Mathematics
subject: 11M06, 11N37, 11Y35

description: We provide an explicit $O\left(\log^2{T}\right)$-term of the celebrated Atkinson's formula for the error term $E(T)$ of the second power moment of the Riemann zeta-function on the critical line. As an application, we obtain an explicit version of well-known estimate $E(T)\ll_{\varepsilon} T^{\frac{1}{3}+\varepsilon}$.
description: 42 pages, 1 figure, 2 tables
Twin Neural Network Regression is a Semi-Supervised Regression Algorithm
Creators: name: Wetzel, Sebastian J.
name: Melko, Roger G.
name: Tamblyn, Isaac
Publisher: name: arXiv
Year: 2021
Subjects: subject: Machine Learning (cs.LG)
subject: FOS: Computer and information sciences

description: Twin neural network regression (TNNR) is a semi-supervised regression algorithm, it can be trained on unlabelled data points as long as other, labelled anchor data points, are present. TNNR is trained to predict differences between the target values of two different data points rather than the targets themselves. By ensembling predicted differences between the targets of an unseen data point and all training data points, it is possible to obtain a very accurate prediction for the original regression problem. Since any loop of predicted differences should sum to zero, loops can be supplied to the training data, even if the data points themselves within loops are unlabelled. Semi-supervised training improves TNNR performance, which is already state of the art, significantly.
F. Francillon (Hg.), Livre des délibérations de l'Église réformée de l'Albenc (1606-1682). Édition du manuscrit conservé à la Bibliothèque d'Étude et d'Information, Grenoble. Fonds Dauphinois, Cote R 9723, 1998
Creators: name: Dinges, M.
Publisher: name: Francia
Year: 2019

description: Francia, Bd. 27 Nr. 2 (2000)
Women in central Queensland: A study of three coastal centres, 1940-1965
Creators: name: Johansen, Winifred
Publisher: name: CQUniversity
Year: 2023
Subjects: classificationCode: 441004
subject: Social change

description: While in agreement with the perceived wisdom that events during World War Two were responsible for many social changes for women in Australia, the thesis disagrees with the implication in existent Queensland womens historiography that these changes affected women equally in all parts of the State. Research undertaken in Central Queensland provides evidence that, although some similarities existed, the conservative forces in this region restricted the liberating effect of such changes. It also addresses the subject of Queensland difference, and argues that the rural patriarchal economy sustained the notion of rigid gender and class differences in Central Queensland. It maintains that this affected women in regional Queensland to a far greater extent than those in the Brisbane metropolitan area because of the lack of secondary wartime industry and the masculine nature of rural industry. Additionally , in opposition to the widely held belief there was universal post-war financial security the thesis argues that poverty did exist. In particular it addresses the subjects of rising inflation and what has been termed the Social Security Poverty Group, basing conclusions on statistical evidence, oral evidence, and secondary and documentary sources.
Examples of the use of transputers in image processing and analog data acquisition
Creators: name: Altoveros, NC
Publisher: name: CQUniversity
Year: 2017
Subjects: classificationCode: 469999
subject: Other information and computing sciences not elsewhere classified

description: Some hardware and software aspects of the transputer have been investigated. This involved two major areas of study. One was the development of inexpensive analog interfaces and the other was the development of an image processing system to identify carbon anode blocks used in the aluminum smelting process. The first part of this study looked at interfacing analog signals to the transputer via the transputer links. In particular, analog to digital and digital to analog converter boards, which were compatible to the industrial standard TRAM configuration, were designed and tested. The 8 bit single channel AID converter board developed was capable of handling a data rate of almost 200 thousand samples per second with a link speed of 20 Mbits/s. The multi-channel AID converter board was capable of sampling at 19.69 thousand samples per second per channel on eight channels, and the D/ A converter board was capable of handling a data throughput of 198.01 thousand conversions per second. The study illustrates that these maximum conversion rates are determined by the OCCAM software and not by the link speed. The second part of the study involved the development of a prototype image processing system to remotely identify carbon anodes. The software development for this was implemented in Turbo Pascal and OCCAM allowing a comparison to be made of the speed of these two implementations. The study details how the image processing techniques of connectivity analysis was applied to the pattern identification process. The use of sequential, concurrent and parallel processes in the implementation is discussed. The study showed that by using a fairly simple two dimensional pattern and a transputer for the processing, it would be possible to identify carbon anodes at several locations in a production plant within the time constraints of the production process.
Recursive Robust PCA or Recursive Sparse Recovery in Large but Structured Noise
Creators: name: Qiu, Chenlu
name: Vaswani, Namrata
name: Lois, Brian
name: Hogben, Leslie
Publisher: name: arXiv
Year: 2012
Subjects: subject: Information Theory (cs.IT)
subject: FOS: Computer and information sciences

description: This work studies the recursive robust principal components' analysis(PCA) problem. Here, "robust" refers to robustness to both independent and correlated sparse outliers. If the outlier is the signal-of-interest, this problem can be interpreted as one of recursively recovering a time sequence of sparse vectors, St, in the presence of large but structured noise, Lt. The structure that we assume on Lt is that Lt is dense and lies in a low dimensional subspace that is either fixed or changes "slowly enough". A key application where this problem occurs is in video surveillance where the goal is to separate a slowly changing background (Lt) from moving foreground objects (St) on-the-fly. To solve the above problem, we introduce a novel solution called Recursive Projected CS (ReProCS). Under mild assumptions, we show that, with high probability (w.h.p.), ReProCS can exactly recover the support set of St at all times; and the reconstruction errors of both St and Lt are upper bounded by a time-invariant and small value at all times.
description: This version was accepted for publication in IEEE Transactions on Information Theory, August 2014
Killing forms on the five-dimensional Einstein-Sasaki Y(p,q) spaces
Creators: name: Visinescu, Mihai
Publisher: name: arXiv
Year: 2012
Subjects: subject: Mathematical Physics (math-ph)
subject: High Energy Physics - Theory (hep-th)
subject: FOS: Physical sciences

description: We present the complete set of Killing-Yano tensors on the five-dimensional Einstein-Sasaki Y(p,q) spaces. Two new Killing-Yano tensors are identified, associated with the complex volume form of the Calabi-Yau metric cone. The corresponding hidden symmetries are not anomalous and the geodesic equations are superintegrable.
description: 10 pages; improved version
Weil Classes and Decomposable Abelian Fourfolds
Creators: name: van Geemen, Bert
Publisher: name: arXiv
Year: 2021
Subjects: subject: Algebraic Geometry (math.AG)
subject: FOS: Mathematics
subject: 14C30

description: We determine which codimension two Hodge classes on $J\times J$, where $J$ is a general abelian surface, deform to Hodge classes on a family of abelian fourfolds of Weil type. If a Hodge class deforms, there is in general a unique such family. We show how to determine the imaginary quadratic field acting on the fourfolds of Weil type in this family as well as their polarization. There are Hodge classes that may deform to more than one family. We relate these to Markman's Cayley classes.
Bayesian on-line anticipation of critical transitions
Creators: name: Heßler, Martin
name: Kamps, Oliver
Publisher: name: arXiv
Year: 2021
Subjects: subject: Data Analysis, Statistics and Probability (physics.data-an)
subject: Adaptation and Self-Organizing Systems (nlin.AO)
subject: Chaotic Dynamics (nlin.CD)
subject: Cellular Automata and Lattice Gases (nlin.CG)
subject: FOS: Physical sciences

description: The design of reliable indicators to anticipate critical transitions in complex systems is an im portant task in order to detect a coming sudden regime shift and to take action in order to either prevent it or mitigate its consequences. We present a data-driven method based on the estimation of a parameterized nonlinear stochastic differential equation that allows for a robust anticipation of critical transitions even in the presence of strong noise levels like they are present in many real world systems. Since the parameter estimation is done by a Markov Chain Monte Carlo approach we have access to credibility bands allowing for a better interpretation of the reliability of the results. By introducing a Bayesian linear segment fit it is possible to give an estimate for the time horizon in which the transition will probably occur based on the current state of information. This approach is also able to handle nonlinear time dependencies of the parameter controlling the transition. In general the method could be used as a tool for on-line analysis to detect changes in the resilience of the system and to provide information on the probability of the occurrence of a critical transition in future.
description: 13 pages, 6 figures, 1 table
Emergence of two-level systems in glass formers: a kinetic Monte Carlo study
Creators: name: Gao, Xin-Yuan
name: Deng, Hai-Yao
name: Lee, Chun-Shing
name: You, J. Q.
name: Lam, Chi-Hang
Publisher: name: arXiv
Year: 2021
Subjects: subject: Soft Condensed Matter (cond-mat.soft)
subject: FOS: Physical sciences

description: Using a distinguishable-particle lattice model based on void-induced dynamics, we successfully reproduce the well-known linear relation between heat capacity and temperature at very low temperatures. The heat capacity is dominated by two-level systems formed due to the strong localization of voids to two neighboring sites, and can be exactly calculated in the limit of ultrastable glasses. Similar but weaker localization at higher temperatures accounts for the glass transition. The result supports the conventional two-level tunneling picture by revealing how two-level systems emerge from random particle interactions, which also cause the glass transition. Our approach provides a unified framework for relating microscopic dynamics of glasses at room and cryogenic temperatures.
C. Zimmermann (Hg.), Europäische Wohnungspolitik in vergleichender Perspektive 1900–1939/European Housing Policy in Comparative Perspective 1900–1939, 1997
Creators: name: Bendikat, Elfi
Publisher: name: Francia
Year: 2019

description: Francia, Bd. 27 Nr. 3 (2000)
Evaluation of sediment transport formulae for estuary conditions: Boyne Estuary: case study
Creators: name: Dhanasekar, Remadevi
Publisher: name: CQUniversity
Year: 2017
Subjects: classificationCode: 410699
subject: Soil sciences not elsewhere classified

description: The problem of sediment transport and sedimentation in estuaries is examined in relation to the Boyne Estuary situated on the Central Queensland Coast. Bottom material characteristics are examined and the most appropriate formulae for prediction of sediment transport are identified.. Estuaries are natural resources that play an important role in the economic and social development of nations. They offer habitat for fish, sites for harbours, industries, and recreational activities. Sediment transport into estuaries, and the subsequent shoaling of estuaries are important estuarine processes that impact upon the physical condition (shape, depth etc) of the estuary, and therefore the uses to which the estuary can be put. As such, estuaries represent important and complex engineering problems. The sediment transport aspect of these estuarine processes is examined in this thesis with a view to quantifying the sediment transport rate in the Boyne Estuary on the Central Queensland coast of Australia. The estuary was characterised into five distinct zones using the particle size distribution of the bottom materiaL A null point, at which the velocity of the river current is effectively balanced by the velocity of the incoming tidal and coastal current was identified in one of the five zones. Analyses of the sediment transport rate were carried out using the depth of flow, mean velocity of flow, bottom roughness and characteristics of the bottom material ofthe Boyne Estuary. Sediment transport formulae reported in the literature are reviewed for this purpose with six formulae, namely, the Ackers-White formula, the Engelund-Hansen formula, the Inglis-Lacey formula, the Van Rijn formula, the Ranga Raju formula, and the Zanke formula, being selected for detailed study. Three of the six formulae (the Van Rijn formula, the Ranga Raju formula, and the Zanke formula) predict the components of the total sediment transport, namely, the bed load transport, and suspended load transport separately. The other three formulae predict the total sediment transport without any detail on the components. Wash load transport is not considered in any of the formulae. The Van Rijn formula was selected as the reference sediment transport formula and three other sediment transport formulae, namely, the Ackers-White, the Engelund-Hansen, and the Inglis-Lacey, that predict close results with the reference formula were found to be suitable for the evaluation of sedimenttransport rate in the Boyne Estuary.
Steady-state spectra, current and stability diagram of a quantum dot: a non-equilibrium Variational Cluster Approach
Creators: name: Nuss, Martin
name: Heil, Christoph
name: Ganahl, Martin
name: Knap, Michael
name: Evertz, Hans Gerd
name: Arrigoni, Enrico
name: von der Linden, Wolfgang
Publisher: name: arXiv
Year: 2012
Subjects: subject: Strongly Correlated Electrons (cond-mat.str-el)
subject: Mesoscale and Nanoscale Physics (cond-mat.mes-hall)
subject: FOS: Physical sciences

description: We calculate steady-state properties of a strongly correlated quantum dot under voltage bias by means of non-equilibrium Cluster Perturbation Theory and the non-equilibrium Variational Cluster Approach, respectively. Results for the steady-state current are benchmarked against data from accurate Matrix Product State based time evolution. We show that for low to medium interaction strength, non-equilibrium Cluster Perturbation Theory already yields good results, while for higher interaction strength the self-consistent feedback of the non-equilibrium Variational Cluster Approach significantly enhances the accuracy. We report the current-voltage characteristics for different interaction strengths. Furthermore we investigate the non-equilibrium local density of states of the quantum dot and illustrate that within the variational approach a linear splitting and broadening of the Kondo resonance is predicted which depends on interaction strength. Calculations with applied gate voltage, away from particle hole symmetry, reveal that the maximum current is reached at the crossover from the Kondo regime to the doubly-occupied or empty quantum dot. Obtained stability diagrams compare very well to recent experimental data [Phys. Rev. B, 84, 245316 (2011)].
description: 13 pages, 7 figures
Evidence of triplet superconductivity in Bi/Ni bilayers: Theoretical analysis of point contact Andreev reflection spectroscopy results
Creators: name: He, Jia-Cheng
name: Chen, Yan
Publisher: name: arXiv
Year: 2021
Subjects: subject: Superconductivity (cond-mat.supr-con)
subject: FOS: Physical sciences

description: A theoretical formalism of Andreev reflection is employed to provide theoretical support for distinguishing between the singlet pairing and the triplet pairing by the point contact Andreev reflection (PCAR) experiments. We utilize our theoretical curves to fit the data of the PCAR experiment on unconventional superconductivity in the Bi/Ni bilayer [arXiv:1810.10403] and find the Anderson-Brinkman-Morel (ABM) state satisfies the main characteristics of the experimental data. The chiral cross-section of the ABM state might explain well the broken time-reversal symmetry determined by the polar Kerr effect measurements and the time-domain THz spectroscopy in Bi/Ni bilayers. Moreover, the Andreev reflection spectra of the Balian-Werthamer state and the chiral $p$-wave state are also presented.
description: 11 pages, 7 figures; major updates; accepted for publication in Physical Review B
Non-adiabatic control of quantum energy transfer in ordered and disordered arrays
Creators: name: Xiang, Ping
name: Litinskaya, Marina
name: Shapiro, Evgeny A.
name: Krems, Roman V.
Publisher: name: arXiv
Year: 2012
Subjects: subject: Quantum Physics (quant-ph)
subject: Atomic Physics (physics.atom-ph)
subject: FOS: Physical sciences

description: An elementary excitation in an aggregate of coupled particles generates a collective excited state. We show that the dynamics of these excitations can be controlled by applying a transient external potential which modifies the phase of the quantum states of the individual particles. The method is based on an interplay of adiabatic and sudden time scales in the quantum evolution of the many-body states. We show that specific phase transformations can be used to accelerate or decelerate quantum energy transfer and spatially focus delocalized excitations onto different parts of arrays of quantum particles. We consider possible experimental implementations of the proposed technique and study the effect of disorder due to the presence of impurities on its fidelity. We further show that the proposed technique can allow control of energy transfer in completely disordered systems.
description: 25 pages, 9 figures
Ancilla-Driven Universal Blind Quantum Computation
Creators: name: Sueki, Takahiro
name: Koshiba, Takeshi
name: Morimae, Tomoyuki
Publisher: name: arXiv
Year: 2012
Subjects: subject: Quantum Physics (quant-ph)
subject: FOS: Physical sciences

description: Blind quantum computation is a new quantum secure protocol, which enables Alice who does not have enough quantum technology to delegate her computation to Bob who has a fully-fledged quantum power without revealing her input, output and algorithm. So far, blind quantum computation has been considered only for the circuit model and the measurement-based model. Here we consider the possibility and the limitation of blind quantum computation in the ancilla-driven model, which is a hybrid of the circuit and the measurement-based models.
description: 4 pages, 9 figures, the revision for improving the readability
Quotients, $\ell_\infty$ and abstract Cesàro spaces
Creators: name: Kiwerski, Tomasz
name: Kolwicz, Paweł
name: Tomaszewski, Jakub
Publisher: name: arXiv
Year: 2021
Subjects: subject: Functional Analysis (math.FA)
subject: FOS: Mathematics

description: Investigating some re-arrangement properties of the norm in the quotient spaces $X/X_a$ we determine the properties of the spaces $X$ guaranteeing the existence of a lattice isometric copy of $\ell_\infty$ in the abstract Cesàro spaces $CX$.
description: 26 pages
D. V. Clarke, T. G. Cowie und A. Foxon, Symbols of Power at the Time of Stonehenge
Creators: name: Mania, Dietrich
name: Mania, Ursula
Publisher: name: Bonner Jahrbücher
Year: 2019

description: D. V. Clarke, T. G. Cowie und A. Foxon, Symbols of Power at the Time of Stonehenge. National Museum of Antiquities of Scotland, Edinburgh 1985. 334 Seiten, 279 Abbildungen, 5 Karten.
description: Bonner Jahrbücher, Bd. 188.1988: Bonner Jahrbücher
The experiences of final year nursing students in administering medications: Shifting levels of supervision
Creators: name: Reid-Searl, Kerry
Publisher: name: CQUniversity
Year: 2017
Subjects: classificationCode: 390110
subject: Medicine, nursing and health curriculum and pedagogy

description: Background - Unintended medication errors made by health care professionals continue to be a major concern in hospitals, medical centres and aged care facilities throughout Australia. Nurses play a vital role in preventing errors so consequently undergraduate nursing students are taught that to administer medications safely they must adhere to specific protocols and be personally supervised by a registered nurse. While safety measures may be reinforced to students, previous studies have not explained what occurs when students actually administer medications to patients in the clinical setting. Aim - This thesis reports on a study aimed at identifying the experiences of final year undergraduate nursing students in administering medications. Research Design - A grounded theory approach using constant comparative analysis was undertaken to develop a substantive theory to explain this process. A sample of 28 final year nursing students from an Australian university provided the data to permit the development of the theory. Findings - This study identified that supervision was central to the medication administrationexperiences of students. Students were confronted with registered nurses who presented or provided them with shifting levels of supervision when administering medications to patients. Shifting levels included the registered nurse; being near, being over or being absent. The shifting levels failed to meet the supportive supervision required of students and created internal conflict for them. Students responded to the conflict through a process of Contingent Reasoning. Contingent Reasoning involved students making a decision and then actioning behaviour which could be categorized into one of three levels. At level one the student would do whatever was asked of them, at level two they would negotiate so as to come to some agreement with the registered nurse and at level three they would refuse to administer medications unless personal supervision was available. The reasoning was driven by a desire of the student to get through meaning, to pass the clinical placement. However, in an effort to get through students were willing to accept levels of supervision from registered nurses that were less than ideal. In turn this influenced medication errors as reported by students. Conclusion - In unveiling the substantive theory it became apparent that the central issue of shifting levels of supervision and students responses to this has significant implications for safe medication administration practices of undergraduate nursing students when undertaking clinical placements in health care facilities throughout Australia. Ultimately patient safety is at risk because inappropriately supervised undergraduate nursing students can make medication errors.
Ioannis Aslanis, Kastanas. Ausgrabungen in einem Siedlungshügel der Bronze- und Eisenzeit Makedoniens 1975-1979. Die frühbronzezeitlichen Funde und Befunde
Creators: name: Kilian, Imma
Publisher: name: Bonner Jahrbücher
Year: 2019

description: Ioannis Aslanis, Kastanas. Ausgrabungen in einem Siedlungshügel der Bronze- und Eisenzeit Makedoniens 1975-1979. Die frühbronzezeitlichen Funde und Befunde. Prähistorische Archäologie in Südosteuropa 4. Verlag Volker Spiess, Berlin 1985. 335 Seiten, 130 Abbildungen, 133 Tafeln. Griechische Zusammenfassung. Alix Hochstetter, Kastanas. Ausgrabungen in einem Siedlungshügel der Bronze- und Eisenzeit Makedoniens 1975-1979. Die Kleinfunde. Mit Beiträgen von Peter R. Franke, Bernhard Hänsel, Bernd Herrmann und Axel Hartmann. Prähistorische Archäologie in Südosteuropa 6. Verlag Volker Spiess, Berlin 1987. 150 Seiten, 26 Abbildungen, 41 Tafeln. Griechische Zusammenfassung.
description: Bonner Jahrbücher, Bd. 188.1988: Bonner Jahrbücher
Epidemic Management and Control Through Risk-Dependent Individual Contact Interventions
Creators: name: Schneider, Tapio
name: Dunbar, Oliver R. A.
name: Wu, Jinlong
name: Böttcher, Lucas
name: Burov, Dmitry
name: Garbuno-Iñigo, Alfredo
name: Wagner, Gregory L.
name: Pei, Sen
name: Daraio, Chiara
name: Ferrari, Raffaele
name: Shaman, Jeffrey
Publisher: name: arXiv
Year: 2021
Subjects: subject: Applications (stat.AP)
subject: Computers and Society (cs.CY)
subject: FOS: Computer and information sciences

description: Testing, contact tracing, and isolation (TTI) is an epidemic management and control approach that is difficult to implement at scale because it relies on manual tracing of contacts. Exposure notification apps have been developed to digitally scale up TTI by harnessing contact data obtained from mobile devices; however, exposure notification apps provide users only with limited binary information when they have been directly exposed to a known infection source. Here we demonstrate a scalable improvement to TTI and exposure notification apps that uses data assimilation (DA) on a contact network. Network DA exploits diverse sources of health data together with the proximity data from mobile devices that exposure notification apps rely upon. It provides users with continuously assessed individual risks of exposure and infection, which can form the basis for targeting individual contact interventions. Simulations of the early COVID-19 epidemic in New York City prove the concepts. In the simulations, network DA identifies up to a factor 2 more infections than contact tracing when both harness the same contact data and diagnostic test data. This remains true even when only a relatively small fraction of the population uses network DA. When a sufficiently large fraction of the population ($\gtrsim 75\%$) uses network DA and complies with individual contact interventions, targeting contact interventions with network DA reduces deaths by up to a factor 4 relative to TTI. Network DA can be implemented by expanding the computational backend of existing exposure notification apps, thus greatly enhancing their capabilities. Implemented at scale, it has the potential to precisely and effectively control future epidemics while minimizing economic disruption.