cometadata/datacite-rtg-text-other-reclassification-records huggingface dataset:
Weak Scale Baryogenesis in a Supersymmetric Scenario with R-parity violation
Creators: name: Rompineve, Fabrizio
Publisher: name: arXiv
Year: 2013
Subjects: subject: High Energy Physics - Phenomenology (hep-ph)
subject: FOS: Physical sciences

description: We investigate the connection between R-parity violation (RPV) in supersymmetric models and Baryogenesis. First we discuss in detail the assumptions of a theorem by Nanopoulos and Weinberg on the CP asymmetry generated from the decay of massive particles. In light of this statement, we analyse some interesting models of Baryogenesis through RPV. We then explore, in the context of RPV SUSY, the possibility to generate the baryon asymmetry through the out-of-equilibrium decay of a metastable Weakly Interacting Massive Particle (WIMP), as proposed in \cite{Cui:2012jh}. This setting is also motivated by the observed coincidence between the abundances of dark and baryonic matter. In this framework, we propose two models of out-of-equilibrium decay of a would-be cold relic, and compute the associated CP asymmetry. With a TeV-scale parent, the observed baryon abundance can be reproduced in these models when the stop is in the multi-TeV region. Furthermore, annihilation of the metastable particle into SM states must be characterised by a very weak coupling, $g\sim 10^{-2}$ and by a heavy mediator $m_{med}\sim 10$ TeV. These models can also accommodate stop masses far from the TeV scale, at the expense of weakening the explanation of the $Ω_{B}-Ω_{DM}$ coincidence.
description: 31 pages, 12 figures. Revised version according to JHEP requirements: quantitative analyses added in Sec. 4, extended and revised list of refs, abstract and conclusions clarified
Graph Sketching Against Adaptive Adversaries Applied to the Minimum Degree Algorithm
Creators: name: Fahrbach, Matthew
name: Miller, Gary L.
name: Peng, Richard
name: Sawlani, Saurabh
name: Wang, Junxing
name: Xu, Shen Chen
Publisher: name: arXiv
Year: 2018
Subjects: subject: Data Structures and Algorithms (cs.DS)
subject: FOS: Computer and information sciences

description: Motivated by the study of matrix elimination orderings in combinatorial scientific computing, we utilize graph sketching and local sampling to give a data structure that provides access to approximate fill degrees of a matrix undergoing elimination in $O(\text{polylog}(n))$ time per elimination and query. We then study the problem of using this data structure in the minimum degree algorithm, which is a widely-used heuristic for producing elimination orderings for sparse matrices by repeatedly eliminating the vertex with (approximate) minimum fill degree. This leads to a nearly-linear time algorithm for generating approximate greedy minimum degree orderings. Despite extensive studies of algorithms for elimination orderings in combinatorial scientific computing, our result is the first rigorous incorporation of randomized tools in this setting, as well as the first nearly-linear time algorithm for producing elimination orderings with provable approximation guarantees. While our sketching data structure readily works in the oblivious adversary model, by repeatedly querying and greedily updating itself, it enters the adaptive adversarial model where the underlying sketches become prone to failure due to dependency issues with their internal randomness. We show how to use an additional sampling procedure to circumvent this problem and to create an independent access sequence. Our technique for decorrelating the interleaved queries and updates to this randomized data structure may be of independent interest.
description: 58 pages, 3 figures. This is a substantially revised version of arXiv:1711.08446 with an emphasis on the underlying theoretical problems
The resurgent character of the Fatou coordinates of a simple parabolic germ
Creators: name: Dudko, Artem
name: Sauzin, David
Publisher: name: arXiv
Year: 2013
Subjects: subject: Dynamical Systems (math.DS)
subject: FOS: Mathematics

description: Given a holomorphic germ at the origin of C with a simple parabolic fixed point, the local dynamics is classically described by means of pairs of attracting and repelling Fatou coordinates and the corresponding pairs of horn maps, of crucial importance for Écalle-Voronin's classification result and the definition of the parabolic renormalization operator. We revisit Écalle's approach to the construction of Fatou coordinates, which relies on Borel-Laplace summation, and give an original and self-contained proof of their resurgent character.
description: 7 pages
Pulling cargo increases the precision of molecular motor progress
Creators: name: Brown, Aidan I
name: Sivak, David A
Publisher: name: arXiv
Year: 2018
Subjects: subject: Statistical Mechanics (cond-mat.stat-mech)
subject: Biological Physics (physics.bio-ph)
subject: FOS: Physical sciences

description: Biomolecular motors use free energy to drive a variety of cellular tasks, including the transport of cargo, such as vesicles and organelles. We find that the widely-used `constant-force' approximation for the effect of cargo on motor dynamics leads to a much larger variance of motor step number compared to explicitly modeling diffusive cargo, suggesting the constant-force approximation may be misapplied in some cases. We also find that, with cargo, motor progress is significantly more precise than suggested by a recent result. For cargo with a low relative diffusivity, the dynamics of continuous cargo motion---rather than discrete motor steps---dominate, leading to a new, more permissive bound on the precision of motor progress which is independent of the number of stages per motor cycle.
description: 9 pages, 10 figures. This is the version of the article before peer review or editing, as submitted by an author to Europhysics Letters. IOP Publishing Ltd is not responsible for any errors or omissions in this version of the manuscript or any version derived from it. The Version of Record is available online at https://doi.org/10.1209/0295-5075/126/40004
title: Ein Gemmenkreuz aus Sandstein? Das spätromanische Portal an St. Leodegar in Grenzach, Kr. Lörrach
Creators: name: Zimdars, Dagmar
Publisher: name: University Library Heidelberg
Year: 2014

description: Denkmalpflege in Baden-Württemberg – Nachrichtenblatt der Landesdenkmalpflege, Bd. 30, Nr. 3 (2001), Beginn und Erscheinungsfrequenz: Ausgaben pro Band: 4
Twisted C*-algebras associated to finitely aligned higher-rank graphs
Creators: name: Sims, Aidan
name: Whitehead, Benjamin
name: Whittaker, Michael F.
Publisher: name: arXiv
Year: 2013
Subjects: subject: Operator Algebras (math.OA)
subject: FOS: Mathematics
subject: 46L05

description: We introduce twisted relative Cuntz-Krieger algebras associated to finitely aligned higher-rank graphs and give a comprehensive treatment of their fundamental structural properties. We establish versions of the usual uniqueness theorems and the classification of gauge-invariant ideals. We show that all twisted relative Cuntz-Krieger algebras associated to finitely aligned higher-rank graphs are nuclear and satisfy the UCT, and that for twists that lift to real-valued cocycles, the K-theory of a twisted relative Cuntz-Krieger algebra is independent of the twist. In the final section, we identify a sufficient condition for simplicity of twisted Cuntz-Krieger algebras associated to higher-rank graphs which are not aperiodic. Our results indicate that this question is significantly more complicated than in the untwisted setting.
description: Version 2: This paper has now appeared in Documenta Mathematica. This version on arXiv exactly matches the pagination and format of the published version. Original published version available from http://www.math.uni-bielefeld.de/documenta/vol-19/28.html
Sensitivity analysis of chaotic systems using a frequency-domain shadowing approach
Creators: name: Kantarakias, Kyriakos D.
name: Papadakis, George
Publisher: name: arXiv
Year: 2022
Subjects: subject: Chaotic Dynamics (nlin.CD)
subject: Numerical Analysis (math.NA)
subject: Analysis of PDEs (math.AP)
subject: Dynamical Systems (math.DS)
subject: Optimization and Control (math.OC)
subject: FOS: Physical sciences
subject: FOS: Mathematics

description: We present a frequency-domain method for computing the sensitivities of time-averaged quantities of chaotic systems with respect to input parameters. Such sensitivities cannot be computed by conventional adjoint analysis tools, because the presence of positive Lyapunov exponents leads to exponential growth of the adjoint variables. The proposed method is based on the least-square shadowing (LSS) approach [1], that formulates the evaluation of sensitivities as an optimisation problem, thereby avoiding the exponential growth of the solution. However, all existing formulations of LSS (and its variants) are in the time domain and the computational cost scales with the number of positive Lyapunov exponents. In the present paper, we reformulate the LSS method in the Fourier space using harmonic balancing. The new method is tested on the Kuramoto-Sivashinski system and the results match with those obtained using the standard time-domain formulation. Although the cost of the direct solution is independent of the number of positive Lyapunov exponents, storage and computing requirements grow rapidly with the size of the system. To mitigate these requirements, we propose a resolvent-based iterative approach that needs much less storage. Application to the Kuramoto-Sivashinski system gave accurate results with very low computational cost. The method is applicable to large systems and paves the way for application of the resolvent-based shadowing approach to turbulent flows. Further work is needed to assess its performance and scalability.
Thermoelectric Properties of (1-x)LaCoO$_{3.x}$La$_{0.7}$Sr$_{0.3}$MnO$_3$ Composite
Creators: name: Kumar, Ashutosh
name: Kumari, Karuna
name: Jayachandran, B.
name: Sivaprahasam, D.
name: Thakur, Ajay D
Publisher: name: arXiv
Year: 2018
Subjects: subject: Materials Science (cond-mat.mtrl-sci)
subject: FOS: Physical sciences

description: We report the thermoelectric (TE) properties of (1-x)LaCoO3.xLa0.7Sr0.3MnO3 (0 < x < 0.10) composite in a temperature range 320-800 K. Addition of La0.7Sr0.3MnO3 to LaCoO3 in small amount (5 weight %) improves the overall Seebeck coefficient (α) at higher temperatures. The electrical conductivity, however, decreases due to a decrease in carrier concentration of the composite. The decrease in electrical conductivity of the composite at high temperature may be attributed to the insulating nature of the LSMO above room temperature. Thermal conductivity (\k{appa}) of all the samples increases with an increase in the temperature but decreases with increasing LSMO content. We also report the local variation of the Seebeck coefficient across the composite samples measured using a precision Seebeck measurement system. A maximum value of 0.09 for the figure of merit (ZT) is obtained for 0.95LaCoO3.0.05La0.7Sr0.3MnO3 at 620 K which is significantly higher than the ZT of either of LaCoO3 or La0.7Sr0.3MnO3 at 620 K. This suggests the potential for enhancement of operating temperatures of hitherto well known low-temperature thermoelectric materials through suitable compositing approach.
description: 16 pages, 7 figures, 2 tables. arXiv admin note: text overlap with arXiv:1807.05562
Relation between fluctuations and efficiency at maximum power for small heat engines
Creators: name: Xu, Guo-Hua
name: Jiang, Chao
name: Minami, Yuki
name: Watanabe, Gentaro
Publisher: name: arXiv
Year: 2022
Subjects: subject: Statistical Mechanics (cond-mat.stat-mech)
subject: FOS: Physical sciences

description: We study the ratio between the variances of work output and heat input, $η^{(2)}$, for a class of four-stroke heat engines which covers various typical cycles. Recent studies on the upper and lower bounds of $η^{(2)}$ are based on the quasistatic limit and the linear response regime, respectively. We extend these relations to the finite-time regime within the endoreversible approximation. We consider the ratio $η_{\text{MP}}^{(2)}$ at maximum power and find that the square of the Curzon-Ahlborn efficiency, $η_{\text{CA}}^2$, gives a good estimate of $η_{\text{MP}}^{(2)}$ for the class of heat engines considered, i.e., $η_{\text{MP}}^{(2)} \simeq η_{\text{CA}}^2$. This resembles the situation where the Curzon-Ahlborn efficiency gives a good estimate of the efficiency at maximum power for various kinds of finite-time heat engines. Taking an overdamped Brownian particle in a harmonic potential as an example, we can realize such endoreversible small heat engines and give an expression of the cumulants of work output and heat input. The approximate relation $η_{\text{MP}}^{(2)} \simeq η_{\text{CA}}^2$ is verified by numerical simulations. This relation also suggests a trade-off between the efficiency and the stability of finite-time heat engines at maximum power.
description: 14 pages, 7 figures
Parcours de gestion de classe dans Zoom
Creators: name: Centre de pédagogie universitaire de l'Université de Montréal
Publisher: name: Université de Montréal, Centre de pédagogie universitaire
Year: 2021
Subjects: Formation à distance
Enseignement à distance
Pédagogie universitaire
Enseignement universitaire
Classes (Éducation)--Conduite
Préparation de cours

description: Schéma qui propose un parcours de gestion de classe virtuelle allant de l'ouverture de la séance à sa clôture.
description: Ressources éducatives libres

REL

Open Educational Resources

OER
Submodular Maximization with Nearly Optimal Approximation, Adaptivity and Query Complexity
Creators: name: Fahrbach, Matthew
name: Mirrokni, Vahab
name: Zadimoghaddam, Morteza
Publisher: name: arXiv
Year: 2018
Subjects: subject: Data Structures and Algorithms (cs.DS)
subject: FOS: Computer and information sciences

description: Submodular optimization generalizes many classic problems in combinatorial optimization and has recently found a wide range of applications in machine learning (e.g., feature engineering and active learning). For many large-scale optimization problems, we are often concerned with the adaptivity complexity of an algorithm, which quantifies the number of sequential rounds where polynomially-many independent function evaluations can be executed in parallel. While low adaptivity is ideal, it is not sufficient for a distributed algorithm to be efficient, since in many practical applications of submodular optimization the number of function evaluations becomes prohibitively expensive. Motivated by these applications, we study the adaptivity and query complexity of adaptive submodular optimization. Our main result is a distributed algorithm for maximizing a monotone submodular function with cardinality constraint $k$ that achieves a $(1-1/e-\varepsilon)$-approximation in expectation. This algorithm runs in $O(\log(n))$ adaptive rounds and makes $O(n)$ calls to the function evaluation oracle in expectation. The approximation guarantee and query complexity are optimal, and the adaptivity is nearly optimal. Moreover, the number of queries is substantially less than in previous works. Last, we extend our results to the submodular cover problem to demonstrate the generality of our algorithm and techniques.
description: 30 pages. This version fixes minor bugs with the definition of $I_t$ and the termination condition of Algorithm 5. We also update all theorem statements to explicitly assume monotone submodular functions
Constraints on Einstein-Æther theory and Horava gravity from binary pulsar observations
Creators: name: Yagi, Kent
name: Blas, Diego
name: Barausse, Enrico
name: Yunes, Nicolas
Publisher: name: arXiv
Year: 2013
Subjects: subject: General Relativity and Quantum Cosmology (gr-qc)
subject: High Energy Astrophysical Phenomena (astro-ph.HE)
subject: High Energy Physics - Phenomenology (hep-ph)
subject: High Energy Physics - Theory (hep-th)
subject: FOS: Physical sciences

description: Binary pulsars are ideal to test the foundations of General Relativity, such as Lorentz symmetry, which requires that experiments produce the same results in all free-falling (i.e.inertial) frames. We here break this symmetry in the gravitational sector by specifying a preferred time direction, and thus a preferred frame, at each spacetime point. We then examine the consequences of this gravitational Lorentz symmetry breaking in the orbital evolution of binary pulsars, focusing on the dissipative effects. We find that Lorentz symmetry breaking modifies these effects, and thus the orbital dynamics, in two different ways. First, it generically causes the emission of dipolar radiation, which makes the orbital separation decrease faster than in General Relativity. Second, the quadrupole component of the emission is also modified. The orbital evolution depends critically on the sensitivities of the stars, which measure how their binding energies depend on the motion relative to the preferred frame. We calculate the sensitivities numerically and compute the predicted orbital decay rate of binary pulsars in Lorentz-violating gravity. By testing these predictions against observations, we place very stringent constraints on gravitational Lorentz violation.
description: 42 pages, 8 figures; typos corrected
Non-monotone Submodular Maximization with Nearly Optimal Adaptivity and Query Complexity
Creators: name: Fahrbach, Matthew
name: Mirrokni, Vahab
name: Zadimoghaddam, Morteza
Publisher: name: arXiv
Year: 2018
Subjects: subject: Data Structures and Algorithms (cs.DS)
subject: FOS: Computer and information sciences

description: Submodular maximization is a general optimization problem with a wide range of applications in machine learning (e.g., active learning, clustering, and feature selection). In large-scale optimization, the parallel running time of an algorithm is governed by its adaptivity, which measures the number of sequential rounds needed if the algorithm can execute polynomially-many independent oracle queries in parallel. While low adaptivity is ideal, it is not sufficient for an algorithm to be efficient in practice -- there are many applications of distributed submodular optimization where the number of function evaluations becomes prohibitively expensive. Motivated by these applications, we study the adaptivity and query complexity of submodular maximization. In this paper, we give the first constant-factor approximation algorithm for maximizing a non-monotone submodular function subject to a cardinality constraint $k$ that runs in $O(\log(n))$ adaptive rounds and makes $O(n \log(k))$ oracle queries in expectation. In our empirical study, we use three real-world applications to compare our algorithm with several benchmarks for non-monotone submodular maximization. The results demonstrate that our algorithm finds competitive solutions using significantly fewer rounds and queries.
description: 19 pages, 8 figures. This version fixes a bug in the threshold sampling algorithm that implicitly assumed monotonicity. All original results hold
Light Deflection by Rotating Regular Black Holes with a Cosmological Constant
Creators: name: Belhaj, A.
name: Belmahi, H.
name: Benali, M.
name: Moumni, H. El
Publisher: name: arXiv
Year: 2022
Subjects: subject: General Relativity and Quantum Cosmology (gr-qc)
subject: High Energy Physics - Theory (hep-th)
subject: FOS: Physical sciences

description: Using the Gauss-Bonnet theorem, we compute and examine the deflection angle of light rays by rotating regular black holes with a cosmological constant. By the help of optical geometries, we first deal with the Hayward black holes with cosmological contributions. Then, we reconsider the study of the Bardeen solutions. We inspect the cosmological constant effect on the deflection angle of light rays. Concretely, we find extra cosmological correction terms generalizing certain obtained findings. Using graphical analysis, we provide a comparative discussion with respect to the Kerr solutions. The results confirm that the non-linear electrodynamic charges affect the space-time geometry by decreasing the deflection angle of light rays by such cosmological black holes.
description: latex, 16 pages, 4 figures. Accepted for publication in Chin. J. Phys 2022
Sticky continuous processes have consistent price systems
Creators: name: Bender, Christian
name: Pakkanen, Mikko S.
name: Sayit, Hasanjan
Publisher: name: arXiv
Year: 2013
Subjects: subject: Pricing of Securities (q-fin.PR)
subject: Probability (math.PR)
subject: FOS: Economics and business
subject: FOS: Mathematics
subject: 91G80 (Primary), 60G44 (Secondary)

description: Under proportional transaction costs, a price process is said to have a consistent price system, if there is a semimartingale with an equivalent martingale measure that evolves within the bid-ask spread. We show that a continuous, multi-asset price process has a consistent price system, under arbitrarily small proportional transaction costs, if it satisfies a natural multi-dimensional generalization of the stickiness condition introduced by Guasoni [Math. Finance 16(3), 569-582 (2006)].
description: 10 pages, v3: incorporates minor corrections and the proof of the main result has been clarified, to appear in Journal of Applied Probability
title: Wissen ist Macht. Ein Realschulgebäude in Albstadt-Ebingen (Zollernalbkreis)
Creators: name: Ruhland, Michael
Publisher: name: University Library Heidelberg
Year: 2014

description: Denkmalpflege in Baden-Württemberg – Nachrichtenblatt der Landesdenkmalpflege, Bd. 30, Nr. 3 (2001), Beginn und Erscheinungsfrequenz: Ausgaben pro Band: 4
Motor Control Insights on Walking Planner and its Stability
Creators: name: Tiseo, Carlo
name: Veluvolu, Kalyana C
name: Ang, Wei Tech
Publisher: name: arXiv
Year: 2018
Subjects: subject: Robotics (cs.RO)
subject: FOS: Computer and information sciences

description: The application of biomechanic and motor control models in the control of bidedal robots (humanoids, and exoskeletons) has revealed limitations of our understanding of human locomotion. A recently proposed model uses the potential energy for bipedal structures to model the bipedal dynamics, and it allows to predict the system dynamics from its kinematics. This work proposes a task-space planner for human-like straight locomotion that target application of in rehabilitation robotics and computational neuroscience. The proposed architecture is based on the potential energy model and employs locomotor strategies from human data as a reference for human behaviour. The model generates Centre of Mass (CoM) trajectories, foot swing trajectories and the Base of Support (BoS) over time. The data show that the proposed architecture can generate behaviour in line with human walking strategies for both the CoM and the foot swing. Despite the CoM vertical trajectory being not as smooth as a human trajectory, yet the proposed model significantly reduces the error in the estimation of the CoM vertical trajectory compared to the inverted pendulum models. The proposed model is also able to asses the stability based on the body kinematics embedding in currently used in the clinical practice. However, the model also implies a shift in the interpretation of the spatiotemporal parameters of the gait, which are now determined by the conditions for the equilibrium and not \textit{vice versa}. In other words, locomotion is a dynamic reaching where the motor primitives are also determined by gravity.
title: Hirtenschulen im Hochschwarzwald. Münstertal (Kreis Breisgau-Schwarzwald)
Creators: name: Kaiser, Wolfgang
name: Reinhardt-Fehrenbach, Gitta
Publisher: name: University Library Heidelberg
Year: 2014

description: Denkmalpflege in Baden-Württemberg – Nachrichtenblatt der Landesdenkmalpflege, Bd. 30, Nr. 3 (2001), Beginn und Erscheinungsfrequenz: Ausgaben pro Band: 4
title: Erfassung jüdischer Friedhöfe in Baden-Württemberg. Zweiter Projektbericht
Creators: name: Strehlen, Martina
Publisher: name: University Library Heidelberg
Year: 2014

description: Denkmalpflege in Baden-Württemberg – Nachrichtenblatt der Landesdenkmalpflege, Bd. 31, Nr. 1 (2002), Beginn und Erscheinungsfrequenz: Ausgaben pro Band: 4
title: Von der Turnhalle zur Markthalle. Die Wiederbelebung des „Möbelwagens“ Wilhelmstraße 5 in Rottweil / Neckar
Creators: name: Laule, Bernhard
Publisher: name: University Library Heidelberg
Year: 2014

description: Denkmalpflege in Baden-Württemberg – Nachrichtenblatt der Landesdenkmalpflege, Bd. 31, Nr. 1 (2002), Beginn und Erscheinungsfrequenz: Ausgaben pro Band: 4
title: Veröffentlichungen des Landesdenkmalamts Baden-Württemberg
Creators: name: Redaktion, Die
Publisher: name: University Library Heidelberg
Year: 2014

description: Denkmalpflege in Baden-Württemberg – Nachrichtenblatt der Landesdenkmalpflege, Bd. 31, Nr. 1 (2002), Beginn und Erscheinungsfrequenz: Ausgaben pro Band: 4
Covariant gauges without Gribov ambiguities in Yang-Mills theories
Creators: name: Serreau, Julien
name: Tissier, Matthieu
name: Tresmontant, Andréas
Publisher: name: arXiv
Year: 2013
Subjects: subject: High Energy Physics - Theory (hep-th)
subject: High Energy Physics - Lattice (hep-lat)
subject: High Energy Physics - Phenomenology (hep-ph)
subject: Nuclear Theory (nucl-th)
subject: FOS: Physical sciences

description: We propose a one-parameter family of nonlinear covariant gauges which can be formulated as an extremization procedure that may be amenable to lattice implementation. At high energies, where the Gribov ambiguities can be ignored, this reduces to the Curci-Ferrari-Delbourgo-Jarvis gauges. We further propose a continuum formulation in terms of a local action which is free of Gribov ambiguities and avoids the Neuberger zero problem of the standard Faddeev-Popov construction. This involves an averaging over Gribov copies with a nonuniform weight, which introduces a new gauge-fixing parameter. We show that the proposed gauge-fixed action is perturbatively renormalizable in four dimensions and we provide explicit expressions of the renormalization factors at one loop. We discuss the possible implications of the present proposal for the calculation of Yang-Mills correlators.
description: 18 pages, 5 figures; published version
On the volumes and affine types of trades
Creators: name: Ghorbani, E.
name: Kamali, S.
name: Khosrovshahi, G. B.
name: Krotov, D. S.
Publisher: name: arXiv
Year: 2018
Subjects: subject: Combinatorics (math.CO)
subject: FOS: Mathematics
subject: 05B05, 05B15, 97B05

description: A $[t]$-trade is a pair $T=(T_+, T_-)$ of disjoint collections of subsets (blocks) of a $v$-set $V$ such that for every $0\le i\le t$, any $i$-subset of $V$ is included in the same number of blocks of $T_+$ and of $T_-$. It follows that $|T_+| = |T_-|$ and this common value is called the volume of $T$. If we restrict all the blocks to have the same size, we obtain the classical $t$-trades as a special case of $[t]$-trades. It is known that the minimum volume of a nonempty $[t]$-trade is $2^t$. Simple $[t]$-trades (i.e., those with no repeated blocks) correspond to a Boolean function of degree at most $v-t-1$. From the characterization of Kasami--Tokura of such functions with small number of ones, it is known that any simple $[t]$-trade of volume at most $2\cdot2^t$ belongs to one of two affine types, called Type\,(A) and Type\,(B) where Type\,(A) $[t]$-trades are known to exist. By considering the affine rank, we prove that $[t]$-trades of Type\,(B) do not exist. Further, we derive the spectrum of volumes of simple trades up to $2.5\cdot 2^t$, extending the known result for volumes less than $2\cdot 2^t$. We also give a characterization of "small" $[t]$-trades for $t=1,2$. Finally, an algorithm to produce $[t]$-trades for specified $t$, $v$ is given. The result of the implementation of the algorithm for $t\le4$, $v\le7$ is reported.
description: 30 pages, final version, to appear in Electron. J. Combin
The cubic Dirac equation: Small initial data in $H^1(\mathbb{R}^3)$
Creators: name: Bejenaru, Ioan
name: Herr, Sebastian
Publisher: name: arXiv
Year: 2013
Subjects: subject: Analysis of PDEs (math.AP)
subject: FOS: Mathematics
subject: 35Q41

description: We establish global well-posedness and scattering for the cubic Dirac equation for small data in the critical space $H^1(\mathbb{R}^3)$. The main ingredient is obtaining a sharp end-point Strichartz estimate for the Klein-Gordon equation. In a classical sense this fails and it is related to the failure of the endpoint Strichartz estimate for the wave equation in space dimension three. In this paper, systems of coordinate frames are constructed in which endpoint Strichartz estimates are recovered and energy estimates are established.
description: v3: minor revision; 47 pages
title: Editorial
Creators: name: Hermann, Rudolf
Publisher: name: University Library Heidelberg
Year: 2014

description: Denkmalpflege in Baden-Württemberg – Nachrichtenblatt der Landesdenkmalpflege, Bd. 32, Nr. 4 (2003), Beginn und Erscheinungsfrequenz: Ausgaben pro Band: 4
Environmental risk factor identification and assessment of health outcomes on selected subjects in and around the vicinity of petrol stations in Ilorin, Kwara state, Nigeria
Creators: name: Lawal, Abosede Hadizat
Publisher: name: Cardiff Metropolitan University
Year: 2022
Subjects: Public health not elsewhere classified

description: In Nigeria, the number of retail petrol stations keeps increasing due to the lucrative petroleum market as a major fuel and economic capital source in the country. Therefore, assessing how the retail petrol station contributes to the health and environmental risks within the country is vital in ensuring the safety and well-being of Nigeria’s population. Retail petrol stations are a major source of employment in Nigeria. These retail petrol stations sell petroleum products to customers, such as petrol, diesel, kerosene, and cooking gas. The study aimed to assess and identify health outcomes and explore the perception and awareness of health hazards related to retail petrol stations in Ilorin, Kwara State and those employed in the sector. A sequential explanatory strategy mixed-methods approach was adopted in conducting this study. The research was carried out in two stages, i.e., the pilot and the main study phase. A quantitative survey and checklist were used to obtain information on the characteristics of Ilorin retail petrol stations and the sociodemographic characteristics of selected subjects employed at the retail petrol stations. Thirty-six operating retail petrol station was chosen for the pilot study. The thirty-six retail petrol stations in the pilot study were also used for the main study phase. Information and sociodemographic factors and quality of life were collected from 96 retail petrol station employees and a comparison group of 200 people within a university setting as representative of the general population. Quality of life information was collected using the SF-36 questionnaire. In the qualitative stage of the main phase study, in-depth interviews and focus groups were conducted to explore the perception and awareness of health and environmental risks associated with retail petrol stations. The interview was conducted with a retail petrol station manager and a public health officer. Three focus groups were conducted among six retail petrol station owners, seven retail petrol station attendants and 20 environmental health officers. The study results show poor occupational health and safety management practices among the selected retail petrol stations and poor awareness and knowledge of health risks related to RPS among RPS owners. Potential factors responsible for the no statistically significant difference between the retail petrol station employees and the general population’s quality of life in this study were also identified. The public and environmental health officers were aware of the health and environmental risks associated with RPSs. This study emphasises the need for policy amendment, increased awareness of environmental & health improvement, and collaborative partnership between stakeholders in tackling retail petrol stations related issues.
3D Simulations of Strongly Magnetised Non-Rotating Supernovae: Explosion Dynamics and Remnant Properties
Creators: name: Varma, Vishnu
name: Mueller, Bernhard
name: Schneider, Fabian R. N.
Publisher: name: arXiv
Year: 2022
Subjects: subject: High Energy Astrophysical Phenomena (astro-ph.HE)
subject: Solar and Stellar Astrophysics (astro-ph.SR)
subject: FOS: Physical sciences

description: We investigate the impact of strong initial magnetic fields in core-collapse supernovae of non-rotating progenitors by simulating the collapse and explosion of a 16.9 Msun star for a strong- and weak-field case assuming a twisted-torus field with initial central field strengths of ~1012 G and ~106 G. The strong-field model has been set up with a view to the fossil-field scenario for magnetar formation and emulates a pre-collapse field configuration that may occur in massive stars formed by a merger. This model undergoes shock revival already 100 s after bounce and reaches an explosion energy of 9.3 x 10^50 erg at 310 ms, in contrast to a more delayed and less energetic explosion in the weak-field model. The strong magnetic fields help trigger a neutrino-driven explosion early on, which results in a rapid rise and saturation of the explosion energy. Dynamically, the strong initial field leads to a fast build-up of magnetic fields in the gain region to 40% of kinetic equipartition and also creates sizable pre-shock ram pressure perturbations that are known to be conducive to asymmetric shock expansion. For the strong-field model, we find an extrapolated neutron star kick of ~350 km/s, a spin period of ~70 ms, and no spin-kick alignment. The dipole field strength of the proto-neutron star is 2 x 10^14 G by the end of the simulation with a declining trend. Surprisingly, the surface dipole field in the weak-field model is stronger, which argues against a straightforward connection between pre-collapse fields and the birth magnetic fields of neutron stars.
description: 16 pages, 20 figures Accepted for publication in MNRAS
Suspended Load Path Tracking Control Using a Tilt-rotor UAV Based on Zonotopic State Estimation
Creators: name: Rego, Brenner S.
name: Raffo, Guilherme V.
Publisher: name: arXiv
Year: 2018
Subjects: subject: Systems and Control (eess.SY)
subject: Robotics (cs.RO)
subject: Optimization and Control (math.OC)
subject: FOS: Electrical engineering, electronic engineering, information engineering
subject: FOS: Computer and information sciences
subject: FOS: Mathematics

description: This work addresses the problem of path tracking control of a suspended load using a tilt-rotor UAV. The main challenge in controlling this kind of system arises from the dynamic behavior imposed by the load, which is usually coupled to the UAV by means of a rope, adding unactuated degrees of freedom to the whole system. Furthermore, to perform the load transportation it is often needed the knowledge of the load position to accomplish the task. Since available sensors are commonly embedded in the mobile platform, information on the load position may not be directly available. To solve this problem in this work, initially, the kinematics of the multi-body mechanical system are formulated from the load's perspective, from which a detailed dynamic model is derived using the Euler-Lagrange approach, yielding a highly coupled, nonlinear state-space representation of the system, affine in the inputs, with the load's position and orientation directly represented by state variables. A zonotopic state estimator is proposed to solve the problem of estimating the load position and orientation, which is formulated based on sensors located at the aircraft, with different sampling times, and unknown-but-bounded measurement noise. To solve the path tracking problem, a discrete-time mixed $\mathcal{H}_2/\mathcal{H}_\infty$ controller with pole-placement constraints is designed with guaranteed time-response properties and robust to unmodeled dynamics, parametric uncertainties, and external disturbances. Results from numerical experiments, performed in a platform based on the Gazebo simulator and on a Computer Aided Design (CAD) model of the system, are presented to corroborate the performance of the zonotopic state estimator along with the designed controller.
title: Ein Streifzug durch die Archäologie Baden-Württembergs. Die Ausstellung „Entdeckungen – Höhepunkte der Landesarchäologie“ in Esslingen am Neckar, Konstanz und Berlin
Creators: name: Bofinger, Jörg
Publisher: name: University Library Heidelberg
Year: 2014

description: Denkmalpflege in Baden-Württemberg – Nachrichtenblatt der Landesdenkmalpflege, Bd. 33, Nr. 1 (2004), Beginn und Erscheinungsfrequenz: Ausgaben pro Band: 4
Colorectal cancer survival prediction using deep distribution based multiple-instance learning
Creators: name: Li, Xingyu
name: Jonnagaddala, Jitendra
name: Cen, Min
name: Zhang, Hong
name: Xu, Xu Steven
Publisher: name: arXiv
Year: 2022
Subjects: subject: Image and Video Processing (eess.IV)
subject: Computer Vision and Pattern Recognition (cs.CV)
subject: FOS: Electrical engineering, electronic engineering, information engineering
subject: FOS: Computer and information sciences

description: Several deep learning algorithms have been developed to predict survival of cancer patients using whole slide images (WSIs).However, identification of image phenotypes within the WSIs that are relevant to patient survival and disease progression is difficult for both clinicians, and deep learning algorithms. Most deep learning based Multiple Instance Learning (MIL) algorithms for survival prediction use either top instances (e.g., maxpooling) or top/bottom instances (e.g., MesoNet) to identify image phenotypes. In this study, we hypothesize that wholistic information of the distribution of the patch scores within a WSI can predict the cancer survival better. We developed a distribution based multiple-instance survival learning algorithm (DeepDisMISL) to validate this hypothesis. We designed and executed experiments using two large international colorectal cancer WSIs datasets - MCO CRC and TCGA COAD-READ. Our results suggest that the more information about the distribution of the patch scores for a WSI, the better is the prediction performance. Including multiple neighborhood instances around each selected distribution location (e.g., percentiles) could further improve the prediction. DeepDisMISL demonstrated superior predictive ability compared to other recently published, state-of-the-art algorithms. Furthermore, our algorithm is interpretable and could assist in understanding the relationship between cancer morphological phenotypes and patients cancer survival risk.
On unbalanced Boolean functions with best correlation immunity
Creators: name: Krotov, Denis S.
name: Vorob'ev, Konstantin V.
Publisher: name: arXiv
Year: 2018
Subjects: subject: Combinatorics (math.CO)
subject: FOS: Mathematics
subject: 06E30, 05B15, 05B30

description: It is known that the order of correlation immunity of a nonconstant unbalanced Boolean function in $n$ variables cannot exceed $2n/3-1$; moreover, it is $2n/3-1$ if and only if the function corresponds to an equitable $2$-partition of the $n$-cube with an eigenvalue $-n/3$ of the quotient matrix. The known series of such functions have proportion $1:3$, $3:5$, or $7:9$ of the number of ones and zeros. We prove that if a nonconstant unbalanced Boolean function attains the correlation-immunity bound and has ratio $C:B$ of the number of ones and zeros, then $CB$ is divisible by $3$. In particular, this proves the nonexistence of equitable partitions for an infinite series of putative quotient matrices. We also establish that there are exactly $2$ equivalence classes of the equitable partitions of the $12$-cube with quotient matrix $[[3,9],[7,5]]$ and $16$ classes, with $[[0,12],[4,8]]$. These parameters correspond to the Boolean functions in $12$ variables with correlation immunity $7$ and proportion $7:9$ and $1:3$, respectively (the case $3:5$ remains unsolved). This also implies the characterization of the orthogonal arrays OA$(1024,12,2,7)$ and OA$(512,11,2,6)$.
description: v3: final; title changed; revised; OA(512,11,2,6) discussed
Doping dependence of fluctuation diamagnetism in High Tc superconductors
Creators: name: Sarkar, Kingshuk
name: Banerjee, Sumilan
name: Mukerjee, Subroto
name: Ramakrishnan, T. V.
Publisher: name: arXiv
Year: 2013
Subjects: subject: Superconductivity (cond-mat.supr-con)
subject: Strongly Correlated Electrons (cond-mat.str-el)
subject: FOS: Physical sciences

description: Using a recently proposed Ginzburg-Landau-like lattice free energy functional due to Banerjee et al. Phys. Rev. B 83, 024510 (2011) we calculate the fluctuation diamagnetism of high-Tc superconductors as a function of doping, magnetic field and temperature. We analyse the pairing fluctuations above the superconducting transition temperature in the cuprates, ranging from the strong phase fluctuation dominated underdoped limit to the more conventional amplitude fluctuation dominated overdoped regime. We show that a model where the pairing scale increases and the superfluid density decreases with underdoping produces features of the observed magnetization in the pseudogap region, in good qualitative and reasonable quantitative agreement with the experimental data. In particular, we explicitly show that even when the pseudogap has a pairing origin the magnetization actually tracks the superconducting dome instead of the pseudogap temperature, as seen in experiment. We discuss the doping dependence of the `onset' temperature for fluctuation diamagnetism and comment on the role of vortex core-energy in our model.
description: 12 pages, 10 figures, Longer version
title: Eine ikonografische Rarität. Die Maria-Joseph-Doppelfigur in Lauterstein-Weißenstein
Creators: name: Preßler, Karsten
Publisher: name: University Library Heidelberg
Year: 2014

description: Denkmalpflege in Baden-Württemberg – Nachrichtenblatt der Landesdenkmalpflege, Bd. 42, Nr. 2 (2013), Beginn und Erscheinungsfrequenz: Ausgaben pro Band: 4
Metric entropy, n-widths, and sampling of functions on manifolds
Creators: name: Ehler, Martin
name: Filbir, Frank
Publisher: name: arXiv
Year: 2013
Subjects: subject: Numerical Analysis (math.NA)
subject: FOS: Mathematics

description: We first investigate on the asymptotics of the Kolmogorov metric entropy and nonlinear n-widths of approximation spaces on some function classes on manifolds and quasi-metric measure spaces. Secondly, we develop constructive algorithms to represent those functions within a prescribed accuracy. The constructions can be based on either spectral information or scattered samples of the target function. Our algorithmic scheme is asymptotically optimal in the sense of nonlinear n-widths and asymptotically optimal up to a logarithmic factor with respect to the metric entropy.
Collective dynamics and rheology of confined phoretic suspensions
Creators: name: Traverso, Tullio
name: Michelin, Sebastien
Publisher: name: arXiv
Year: 2022
Subjects: subject: Soft Condensed Matter (cond-mat.soft)
subject: Biological Physics (physics.bio-ph)
subject: Fluid Dynamics (physics.flu-dyn)
subject: FOS: Physical sciences

description: Similarly to their biological counterparts, suspensions of chemically-active autophoretic swimmers exhibit nontrivial dynamics involving self-organization processes as a result of inter-particle interactions. Using a kinetic model for a dilute suspension of autochemotactic Janus particles, we analyse the effect of a confined pressure-driven flow on these collective behaviours and the impact of chemotactic aggregation on the effective viscosity of the active fluid. Four dynamic regimes are identified when increasing the strength of the imposed pressure-driven flow, each associated with a different collective behaviour resulting from the competition of flow- and chemically-induced reorientation of the swimmers together with the constraints of confinement. Interestingly, we observe that the effect of the pusher (resp. puller) hydrodynamic signature, which is known to reduce (resp. increase) the effective viscosity of a sheared suspension, is inverted upon the emergence of autochemotactic aggregation. Our results provide new insights on the role of collective dynamics in complex environments, which are relevant to synthetic as well as biological systems.
description: 26 pages, 18 figures, to appear in J. Fluid Mech
Food safety behaviour in the home: Development, application and evaluation of a social marketing food safety education initiative.
Creators: name: Redmond, Elizabeth
Publisher: name: Cardiff Metropolitan University
Year: 2022
Subjects: Food sciences not elsewhere classified

description: Foodborne disease is recognised as an important public health problem, with the domestic kitchen thought to be a point of origin for many cases. Foodborne pathogens associated with a range of raw foods can contaminate the kitchen unless appropriate food safety control measures are implemented. Consumer food safety education is therefore required to improve food safety practices during food preparation, and thus reduce the risk of foodborne disease. Quantitative and qualitative research methods have been used to evaluate consumer attitudes towards food safety in the domestic kitchen and food safety education. Additionally, food safety behaviours have been assessed using an advanced observational technique incorporating CCTV and risk based scoring. This provided a quantitative assessment of the frequency, consistency and reproducibility of food safety malpractices, and enabled an evaluation of food safety intervention effectiveness. Observations showed that food safety behaviours were variable and in many cases unsafe, indicating the need for food safety education. Overall, general consumer attitudes towards food safety in the domestic kitchen and food safety education were positive, although differences in respondent demographics highlighted the need for targeted educational efforts. Research findings informed development of a social marketing initiative that aimed to improve specific food safety behaviours. Observation results showed that the majority of consumers implemented unsafe cross contamination behaviours, so improvement of such actions was determined as the behavioural objective of the initiative. An evaluation of behaviours before and after intervention suggested that a 'one-off' social marketing strategy resulted in an initial behavioural improvement, which was not wholly maintained after 4-6 weeks. Results indicate that application of social marketing to food safety education may help to improve consumer food safety behaviours and reduce the risk of foodborne disease. Cumulatively, this thesis has improved our understanding of consumer food safety behaviour, and provided important data to inform the development of future food safety education initiatives that intend to raise awareness of food safety issues, and bring about behavioural change.