cometadata/datacite-rtg-text-other-reclassification-records huggingface dataset:
Transformation of an energy spectrum and wave functions in the crossover from two- to three-dimensional topological insulator in HgTe quantum wells: long and thorny way
Creators: name: Minkov, G. M.
name: Aleshkin, V. Ya.
name: Rut, O. E.
name: Sherstobitov, A. A.
name: Dvoretski, S. A.
name: Mikhailov, N. N.
name: Germanenko, A. V.
Publisher: name: arXiv
Year: 2021
Subjects: subject: Mesoscale and Nanoscale Physics (cond-mat.mes-hall)
subject: FOS: Physical sciences

description: A magnetotransport and quantum capacitance of the two-dimensional electron gas in HgTe/Cd$_x$Hg$_{1-x}$Te quantum wells of a width ($20.2-46.0$)~nm are experimentally investigated. It is shown that the first energy subband of spatial quantization is split due to the spin-orbit interaction and the split branches are single-spin, therewith the splitting strength increases with the increase of the quantum well width. The electron effective masses in the branches are close to each other within the actual density range. Magneto-intersubband oscillations (MISO) observed in the structures under study exhibit the growing amplitude with the increasing electron density that contradicts to the expected decrease of wave function overlap for the rectangular quantum well. To interpret the data obtained, we have used a self-consistent approach to calculate the electron energy spectrum and the wave function within framework of the \emph{kP}-model. It has been in particular shown that the MISO amplitude increase results from the increasing overlap of the wave functions due to their shift from the gate electrode with the gate voltage increase known as phenomenon of the negative electron polarizability. The results obtained from the transport experiments are supported by quantum capacitance measurements.
description: 12 pages, 15 figures
Architectures, services, and technologies towards 6G Non-Terrestrial Networks
Creators: name: Guidotti, Alessandro
name: Vanelli-Coralli, Alessandro
name: El Jaaafari, Mohamed
name: Chuberre, Nicolas
name: Chamaillard, Baptiste
name: Puttonen, Jani
name: Schena, Vincenzo
name: Rinelli, Giuseppe
name: Cioni, Stefano
name: Amatetti, Carla
name: Campana, Riccardo
name: De Filippo, Bruno
name: Disperati, Galileo
name: Piani, Clementina
Publisher: name: Zenodo
Year: 2023
Subjects: 6G
Non-Terrestrial Networks
EAGER project
5G-Advanced
Beyond 5G
White Paper

description: The EAGER White Paper, entitled “Architectures, services, and technologies towards 6G Non-Terrestrial Networks”, summarises the main analysis and assessments of the EAGER project by now. The publication begins with an outline of the path that led to the definition of the first set of specifications for Non-Terrestrial Networks (NTN)-based 5G systems in the 3GPP’s Release 17. It then provides an overview of the current activities, as well as what can be considered as candidate architectures and technologies, for 5G-Advanced and 6G NTN systems.
description: This work has been carried out in the framework of the EAGER (tEchnologies And techniques for satcom beyond 5G nEtwoRks) project, under a programme funded by, the European Space Agency (ESA). The views expressed in this document can in no way be taken to reflect the official opinion of the European Space Agency.
Contact feedback helps snake robots propel against uneven terrain using vertical bending
Creators: name: Fu, Qiyuan
name: Li, Chen
Publisher: name: arXiv
Year: 2021
Subjects: subject: Biological Physics (physics.bio-ph)
subject: Systems and Control (eess.SY)
subject: FOS: Physical sciences
subject: FOS: Electrical engineering, electronic engineering, information engineering

description: Snakes can bend their elongate bodies in various forms to traverse various environments. We understand how snakes use lateral bending to push against asperities on flat ground for propulsion, and snake robots can do so effectively. However, snakes can also use vertical bending to push against terrain of large height variation for propulsion, and they can adjust it to adapt to novel terrain presumably using mechano-sensing feedback control. Although some snake robots can traverse uneven terrain, few have used vertical bending for propulsion, and how to control it in novel environments is poorly understood. Here we systematically studied a snake robot with force sensors pushing against large bumps using vertical bending to understand the role of sensory feedback control. We compared a feedforward controller and four feedback controllers that use different senses and generate distinct bending patterns and body-terrain interaction. We challenged the robot with increasing backward load and novel terrain geometry that break its contact with the terrain. We further varied how much the feedback control modulated bending to conform to or push against the terrain to test their effects. Feedforward propagation of vertical bending generated large propulsion when the shape matched terrain geometry. However, when perturbations caused loss of contact, the robot easily lost propulsion or had motor overload. Contact feedback control resolved these by improving contact. Yet excessive conformation interrupted propagation and excessive pushing stalled motors. Unlike that using lateral bending, for propulsion generation using vertical bending, body weight can help maintain contact with the environment but may also overload motors. Our results will help snake robots better traverse terrain with large height variation and can inform how snakes use sensory feedback to control vertical bending for propulsion.
description: 62 pages, 20 figures
Community relations under pressure: Local residents’ perceptions of corporate crisis communication
Creators: name: Balliu, Laurence
name: Claeys, An-Sofie
name: Van Leuven, Sarah
Publisher: name: Taylor & Francis
Year: 2024
Subjects: subject: Ecology
subject: FOS: Biological sciences
subject: Sociology
subject: FOS: Sociology
subject: Biological Sciences not elsewhere classified
subject: Science Policy

description: High-risk organizations, such as chemical companies, are urged to engage in long-term, dialogic community relations with local residents. Community engagement can establish organizational legitimacy and help to address local concerns. However, stakeholders may be skeptical toward communication efforts made by high-risk organizations, especially during crisis situations. This qualitative study explores whether two Belgian communities are skeptical of the communication efforts made by chemical companies regarding pollution crises, what motives they attribute to the crisis communication, and which communication characteristics shape those attributions. In-depth interviews with 47 local community members reveal that the crisis communication efforts were considered self-serving and attributed to corporate concerns over (a) legitimacy, (b) financial consequences and (c) legal liability. Interviewees believed that these self-serving motives took precedence over public interests. This study also describes communication cues that triggered or strengthened suspicions. Practical recommendations are proposed for chemical companies to improve relationships with local communities.
Efficient Linear Scaling Approach for Computing the Kubo Hall Conductivity
Creators: name: Ortmann, Frank
name: Leconte, Nicolas
name: Roche, Stephan
Publisher: name: arXiv
Year: 2015
Subjects: subject: Mesoscale and Nanoscale Physics (cond-mat.mes-hall)
subject: FOS: Physical sciences

description: We report an order-N approach to compute the Kubo Hall conductivity for disorderd two-dimensional systems reaching tens of millions of orbitals, and realistic values of the applied external magnetic fields (as low as a few Tesla). A time-evolution scheme is employed to evaluate the Hall conductivity $σ_{xy}$ using a wavepacket propagation method and a continued fraction expansion for the computation of diagonal and off-diagonal matrix elements of the Green functions. The validity of the method is demonstrated by comparison of results with brute-force diagonalization of the Kubo formula, using (disordered) graphene as system of study. This approach to mesoscopic system sizes is opening an unprecedented perspective for so-called reverse engineering in which the available experimental transport data are used to get a deeper understanding of the microscopic structure of the samples. Besides, this will not only allow addressing subtle issues in terms of resistance standardization of large scale materials (such as wafer scale polycrystalline graphene), but will also enable the discovery of new quantum transport phenomena in complex two-dimensional materials, out of reach with classical methods.
description: submitted PRB paper
Capturing Subgrid Temperature and Moisture Variations for Wildland Fire Modeling
Creators: Marshall, Ginny A.
Linn, Rod
Holmes, Marlin
Goodrick, Scott
Thompson, Dan K.
Hemmati, Arman
Publisher: name: University of Alberta Library
Year: 2022

Conference Abstract. Part of the Proceedings of the Canadian Society for Mechanical Engineering International Congress 2022.
A Survey on Hyperdimensional Computing aka Vector Symbolic Architectures, Part II: Applications, Cognitive Models, and Challenges
Creators: name: Kleyko, Denis
name: Rachkovskij, Dmitri A.
name: Osipov, Evgeny
name: Rahimi, Abbas
Publisher: name: arXiv
Year: 2021
Subjects: subject: Artificial Intelligence (cs.AI)
subject: FOS: Computer and information sciences

description: This is Part II of the two-part comprehensive survey devoted to a computing framework most commonly known under the names Hyperdimensional Computing and Vector Symbolic Architectures (HDC/VSA). Both names refer to a family of computational models that use high-dimensional distributed representations and rely on the algebraic properties of their key operations to incorporate the advantages of structured symbolic representations and vector distributed representations. Holographic Reduced Representations is an influential HDC/VSA model that is well-known in the machine learning domain and often used to refer to the whole family. However, for the sake of consistency, we use HDC/VSA to refer to the field. Part I of this survey covered foundational aspects of the field, such as the historical context leading to the development of HDC/VSA, key elements of any HDC/VSA model, known HDC/VSA models, and the transformation of input data of various types into high-dimensional vectors suitable for HDC/VSA. This second part surveys existing applications, the role of HDC/VSA in cognitive computing and architectures, as well as directions for future work. Most of the applications lie within the Machine Learning/Artificial Intelligence domain, however, we also cover other applications to provide a complete picture. The survey is written to be useful for both newcomers and practitioners.
description: 37 pages
Network Dynamics with Higher-Order Interactions: Coupled Cell Hypernetworks for Identical Cells and Synchrony
Creators: name: Aguiar, Manuela
name: Bick, Christian
name: Dias, Ana
Publisher: name: arXiv
Year: 2022
Subjects: subject: Dynamical Systems (math.DS)
subject: Adaptation and Self-Organizing Systems (nlin.AO)
subject: FOS: Mathematics
subject: FOS: Physical sciences

description: Network interactions that are nonlinear in the state of more than two nodes - also known as higher-order interactions - can have a profound impact on the collective network dynamics. Here we develop a coupled cell hypernetwork formalism to elucidate the existence and stability of (cluster) synchronization patterns in network dynamical systems with higher-order interactions. More specifically, we define robust synchrony subspace for coupled cell hypernetworks whose coupling structure is determined by an underlying hypergraph and describe those spaces for general such hypernetworks. Since a hypergraph can be equivalently represented as a bipartite graph between its nodes and hyperedges, we relate the synchrony subspaces of a hypernetwork to balanced colorings of the corresponding incidence digraph.
On the L^p-theory of Anisotropic singular perturbations of elliptic problems
Creators: name: Ogabi, Chokri
Publisher: name: arXiv
Year: 2015
Subjects: subject: Analysis of PDEs (math.AP)
subject: FOS: Mathematics
subject: 35J15, 35B60, 35B25

description: In this article we give an extention of the L^2-theory of anisotropic singular perturbations for elliptic problems. We study a linear and some nonlinear problems involving L^p data (1
description: 23 pages, Some minor corrections
Energy based methods applied in mechanics by using the extended Noether's formalism
Creators: name: Abali, Bilen Emek
Publisher: name: arXiv
Year: 2022
Subjects: subject: Classical Physics (physics.class-ph)
subject: FOS: Physical sciences

description: Physical systems are modeled by field equations; these are coupled, partial differential equations in space and time. Field equations are often given by balance equations and constitutive equations, where the former are axiomatically given and the latter are thermodynamically derived. This approach is useful in thermomechanics and electromagnetism, yet challenges arise once we apply it in damage mechanics for generalized continua. For deriving governing equations, an alternative method is based on a variational framework known as the extended Noether's formalism. Its formal introduction relies on mathematical concepts limiting its use in applied mechanics as a field theory. In this work, we demonstrate the power of extended Noether's formalism by using tensor algebra and usual continuum mechanics nomenclature. We demonstrate derivation of field equations in damage mechanics for generalized continua, specifically in the case of strain gradient elasticity.
Functional overlap in mismatch repair by human MSH3 and MSH6.
Creators: name: The University of North Carolina at Chapel Hill University Libraries
Publisher: name: The University of North Carolina at Chapel Hill University Libraries
Year: 1998

description: Three human genes, hMSH2, hMSH3, and hMSH6, are homologues of the bacterial MutS gene whose products bind DNA mismatches to initiate strand-specific repair of DNA replication errors. Several studies suggest that a complex of hMSH2 x hMSH6 (hMutSalpha) functions primarily in repair of base x base mismatches or single extra bases, whereas a hMSH2 x hMSH3 complex (hMutSbeta) functions chiefly in repair of heteroduplexes containing two to four extra bases. In the present study, we compare results with a tumor cell line (HHUA) that is mutant in both hMSH3 and hMSH6 to results with derivative clones containing either wild-type hMSH3 or wild-type hMSH6, introduced by microcell-mediated transfer of chromosome 5 or 2, respectively. HHUA cells exhibit marked instability at 12 different microsatellite loci composed of repeat units of 1 to 4 base pairs. Compared to normal cells, HHUA cells have mutation rates at the HPRT locus that are elevated 500-fold for base substitutions and 2400-fold for single-base frameshifts. Extracts of HHUA cells are defective in strand-specific repair of substrates containing base x base mismatches or 1-4 extra bases. Transfer of either chromosome 5 (hMSH3) or 2 (hMSH6) into HHUA cells partially corrects instability at the microsatellite loci and also the substitution and frameshift mutator phenotypes at the HPRT locus. Extracts of these lines can repair some, but not all, heteroduplexes. The combined mutation rate and mismatch repair specificity data suggest that both hMSH3 and hMSH6 can independently participate in repair of replication errors containing base x base mismatches or 1-4 extra bases. Thus, these two gene products share redundant roles in controlling mutation rates in human cells.
Strong convergence of weighted gradients in parabolic equations and applications to global generalized solvability of cross-diffusive systems
Creators: name: Fuest, Mario
Publisher: name: arXiv
Year: 2022
Subjects: subject: Analysis of PDEs (math.AP)
subject: FOS: Mathematics
subject: 35A35 (primary), 35D99, 35K05, 35K55, 92C17 (secondary)

description: In the first part of the present paper, we show that strong convergence of $(v_{0 \varepsilon})_{\varepsilon \in (0, 1)}$ in $L^1(Ω)$ and weak convergence of $(f_{\varepsilon})_{\varepsilon \in (0, 1)}$ in $L_{\textrm{loc}}^1(\overline Ω\times [0, \infty))$ not only suffice to conclude that solutions to the initial boundary value problem \begin{align*} \begin{cases} v_{\varepsilon t} = Δv_\varepsilon + f_\varepsilon(x, t) & \text{in $Ω\times (0, \infty)$}, \\ \partial_νv_\varepsilon = 0 & \text{on $\partial Ω\times (0, \infty)$}, \\ v_\varepsilon(\cdot, 0) = v_{0 \varepsilon} & \text{in $Ω$}, \end{cases} \end{align*} which we consider in smooth, bounded domains $Ω$, converge to the unique weak solution of the limit problem, but that also certain weighted gradients of $v_\varepsilon$ converge strongly in $L_{\textrm{loc}}^2(\overline Ω\times [0, \infty))$ along a subsequence. We then make use of these findings to obtain global generalized solutions to various cross-diffusive systems. Inter alia, we establish global generalized solvability of the system \begin{align*} \begin{cases} u_t = Δu - χ\nabla \cdot (\frac{u}{v} \nabla v) + g(u), \\ v_t = Δv - uv, \end{cases} \end{align*} where $χ> 0$ and $g \in C^1([0, \infty))$ are given, merely provided that ($g(0) \geq 0$ and) $-g$ grows superlinearily. This result holds in all space dimensions and does neither require any symmetry assumptions nor the smallness of certain parameters. Thereby, we expand on a corresponding result for quadratically growing $-g$ proved by Lankeit and Lankeit (Nonlinearity, 32(5):1569--1596, 2019).
description: 43 pages
SELF-REGULATING ELASTOMERIC TUBES: AN EXPERIMENTAL AND ABAQUS-BASED STUDY
Creators: Jen, Nathan
Bessa, Guilherme
Nicholson, KAelyn
Xiao, Jianliang
Nobes, David S.
Chung, Hyun-Joong
Publisher: name: University of Alberta Library
Year: 2022

Conference abstract. Part of the Proceedings of the Canadian Society for Mechanical Engineering International Congress 2022.
title: Platelet functional abnormalities in pediatric patients with kaposiform hemangioendothelioma/Kasabach-Merritt phenomenon
Creators: name: Martyanov, Alexey A.
name: Tesakov, Ivan P.
name: Khachatryan, Lili A.
name: An, Olga I.
name: Boldova, Anna E.
name: Ignatova, Anastasia A.
name: Koltsova, Ekaterina M.
name: Korobkin, Julia-Jessica D.
name: Podoplelova, Nadezhda A.
name: Svidelskaya, Galina S.
name: Yushkova, Eugenia
name: Novichkova, Galina A.
name: Eble, Johannes A.
name: Panteleev, Mikhail A.
name: Kalinin, Dmitrii V.
name: Sveshnikova, Anastasia N.
Publisher: name: University of Muenster, Institutional Repository MIAMI
Year: 2023
Subjects: subject: 610 Medicine and health

description: Kaposiform hemangioendothelioma (KHE) is a rare vascular tumor of infancy that is commonly associated with a life-threatening thrombocytopenic condition, Kasabach-Merritt phenomenon (KMP). Platelet CLEC-2, tumor podoplanin interaction is considered the key mechanism of platelet clearance in these patients. Here, we aimed to assess platelet functionality in such patients. Three groups of 6 to 9 children were enrolled: group A with KHE/KMP without hematologic response (HR) to therapy; group B with KHE/KMP with HR; and group C with healthy children. Platelet functionality was assessed by continuous and end point flow cytometry, low-angle light scattering analysis (LaSca), fluorescent microscopy of blood smears, and ex vivo thrombi formation. Platelet integrin activation in response to a combination of CRP (GPVI agonist) and TRAP-6 (PAR1 agonist), as well as calcium mobilization and integrin activation in response to CRP or rhodocytin (CLEC-2 agonist) alone, were significantly diminished in groups A and B. At the same time, platelet responses to ADP with or without TRAP-6 were unaltered. Thrombi formation from collagen in parallel plate flow chambers was also noticeably decreased in groups A and B. In silico analysis of these results predicted diminished amounts of CLEC-2 on the platelet surface of patients, which was further confirmed by immunofluorescence microscopy and flow cytometry. In addition, we also noted a decrease in GPVI levels on platelets from group A. In KHE/KMP, platelet responses induced by CLEC-2 or GPVI activation are impaired because of the diminished number of receptors on the platelet surface. This impairment correlates with the severity of the disease and resolves as the patient recovers.
description: Finanziert durch den Open-Access-Publikationsfonds der Westfälischen Wilhelms-Universität Münster (WWU Münster).
Effect of Surface Modification on the Mechanical and Interfacial Properties of Cattail Fiber Reinforced Composites
Creators: Shadhin, Md
Rahman, Mashiur
Jayaraman, Raghavan
Mann, Danny
Publisher: name: University of Alberta Library
Year: 2022

Conference Abstract. Part of the Proceedings of the Canadian Society for Mechanical Engineering International Congress 2022.
Instrumentation for comparing night sky quality and atmospheric conditions of CTA site candidates
Creators: name: Fruck, Christian
name: Gaug, Markus
name: Ernenwein, Jean-Pierre
name: Mandát, Dušan
name: Schweizer, Thomas
name: Häfner, Dennis
name: Bulik, Tomasz
name: Cieslar, Marek
name: Costantini, Heide
name: Dominik, Michal
name: Ebr, Jan
name: Garczarczyk, Markus
name: Lorentz, Eckart
name: Pareschi, Giovanni
name: Pech, Miroslav
name: Puerto-Giménez, Irene
name: Teshima, Masahiro
Publisher: name: arXiv
Year: 2015
Subjects: subject: Instrumentation and Methods for Astrophysics (astro-ph.IM)
subject: High Energy Astrophysical Phenomena (astro-ph.HE)
subject: Instrumentation and Detectors (physics.ins-det)
subject: FOS: Physical sciences

description: Many atmospheric and climatic criteria have to be taken into account for the selection of a suitable site for the next generation of imaging air-shower Cherenkov telescopes, the "Cherenkov Telescope Array" CTA. Such data are not available with sufficient precision, thus a comparison of the proposed sites and final decision based on a comprehensive characterization is impossible. Identical cross-calibrated instruments have been developed which allow for precise comparison between sites, the cross-validation of existing data, and the ground-validation of satellite data. The site characterization work package of the CTA consortium opted to construct and deploy 9 copies of an autonomous multi-purpose weather sensor, incorporating an infrared cloud sensor, a newly developed sensor for measuring the light of the night sky, and an All-Sky-Camera, the whole referred to as Autonomous Tool for Measuring Observatory Site COnditions PrEcisely (ATMOSCOPE). We present here the hardware that was combined into the ATMOSCOPE and characterize its performance.
description: 32 pages, 30 figures
Decoherent time-dependent transport beyond the Landauer-Büttiker formulation: a quantum-drift alternative to quantum jumps
Creators: name: Fernández-Alcázar, Lucas J.
name: Pastawski, Horacio M.
Publisher: name: arXiv
Year: 2015
Subjects: subject: Quantum Physics (quant-ph)
subject: FOS: Physical sciences

description: We present a model for decoherence in time-dependent transport. It boils down into a form of wave function that undergoes a smooth stochastic drift of the phase in a local basis, the Quantum Drift (QD) model. This drift is nothing else but a local energy fluctuation. Unlike Quantum Jumps (QJ) models, no jumps are present in the density as the evolution is unitary. As a first application, we address the transport through a resonant state $\left\vert 0\right\rangle $ that undergoes decoherence. We show the equivalence with the decoherent steady state transport in presence of a Büttiker's voltage probe. In order to test the dynamics, we consider two many-spin systems whith a local energy fluctuation. A two-spin system is reduced to a two level system (TLS) that oscillates among $\left\vert 0\right\rangle $ $\equiv $ $ \left\vert \uparrow \downarrow \right\rangle $ and $\left\vert 1\right\rangle \equiv $ $\left\vert \downarrow \uparrow \right\rangle $. We show that QD model recovers not only the exponential damping of the oscillations in the low perturbation regime, but also the non-trivial bifurcation of the damping rates at a critical point, i.e. the quantum dynamical phase transition. We also address the spin-wave like dynamics of local polarization in a spin chain. The QD average solution has about half the dispersion respect to the mean dynamics than QJ. By evaluating the Loschmidt Echo (LE), we find that the pure states $\left\vert 0\right\rangle $ and $\left\vert 1\right \rangle $ are quite robust against the local decoherence. In contrast, the LE, and hence coherence, decays faster when the system is in a superposition state. Because its simple implementation, the method is well suited to assess decoherent transport problems as well as to include decoherence in both one-body and many-body dynamics.
description: 10 pages, 5 figures
Value Propositions in the Internet of Things: A Taxonomy of B2B Smart Services
Creators: name: Heinz, Daniel
name: Luchner, Philipp
name: Benz, Carina
name: Fassnacht, Marcel Kyron
Publisher: name: Institute of Electrical and Electronics Engineers (IEEE)
Year: 2023

description: Connected and smart products give rise to smart services that leverage their advanced capabilities and promise profitable business models. However, many companies in the Internet of Things domain are still struggling to incorporate smart services into their portfolios, and more research is needed to facilitate service innovation and adoption. We, therefore, identify common characteristics of the value propositions of B2B smart services and summarize them in a taxonomy. The taxonomy development follows established methods and is based on a systematic literature review and the study of 100 empirical objects. To confirm the validity of our findings, we conduct two ex-post evaluations. Our research provides descriptive knowledge about B2B smart services that can serve as a foundation for further research on smart service innovation.
On the Hilbert function of Artinian local complete intersections of codimension three
Creators: name: Jelisiejew, Joachim
name: Masuti, Shreedevi K.
name: Rossi, M. E.
Publisher: name: arXiv
Year: 2022
Subjects: subject: Commutative Algebra (math.AC)
subject: FOS: Mathematics
subject: Primary: 13D40, 13H10, Secondary:13A30, 13J05, 13F20

description: In singularity theory or algebraic geometry, it is natural to investigate possible Hilbert functions for special algebras $A$ such as local complete intersections or more generally Gorenstein algebras. The sequences that occur as {the} Hilbert functions of standard graded complete intersections are well understood classically thanks to Macaulay and Stanley. Very little is known in the local case except in codimension two. In this paper we characterise the Hilbert functions of quadratic Artinian complete intersections of codimension three. Interestingly we prove that a Hilbert function is admissible for such a Gorenstein ring if and only if is admissible for such a complete intersection. We provide an effective construction of a local complete intersection for a given Hilbert function. We prove that the symmetric decomposition of such a complete intersection ideal is determined by its Hilbert function.
description: v2: minor corrections, 20 pages
Spectra of spontaneous frameshift mutations at the hisD3052 allele of Salmonella typhimurium in four DNA repair backgrounds.
Creators: name: The University of North Carolina at Chapel Hill University Libraries
Publisher: name: The University of North Carolina at Chapel Hill University Libraries
Year: 1998

description: To characterize the hisD3052 -1 frameshift allele of Salmonella typhimurium, we analyzed approximately 6000 spontaneous revertants (rev) for a 2-base deletion hotspot within the sequence (CG)4, and we sequenced approximately 500 nonhotspot rev. The reversion target is a minimum of 76 bases (nucleotides 843-918) that code for amino acids within a nonconserved region of the histidinol dehydrogenase protein. Only 0.4-3.9% were true rev. Of the following classes, 182 unique second-site mutations were identified: hotspot, complex frameshifts requiring DeltauvrB + pKM101 (TA98-specific) or not (concerted), 1-base insertions, duplications, and nonhotspot deletions. The percentages of hotspot mutations were 13.8% in TA1978 (wild type), 24.5% in UTH8413 (pKM101), 31.6% in TA1538 (DeltauvrB), and 41.0% in TA98 (DeltauvrB, pKM101). The DeltauvrB allele decreased by three times the mutant frequency (MF, rev/10(8) survivors) of duplications and increased by about two times the MF of deletions. Separately, the DeltauvrB allele or pKM101 plasmid increased by two to three times the MF of hotspot mutations; combined, they increased this MF by five times. The percentage of 1-base insertions was not influenced by either DeltauvrB or pKM101. Hotspot deletions and TA98-specific complex frameshifts are inducible by some mutagens; concerted complex frameshifts and 1-base insertions are not; and there is little evidence for mutagen-induced duplications and nonhotspot deletions. Except for the base substitutions in TA98-specific complex frameshifts, all spontaneous mutations of the hisD3052 allele are likely templated. The mechanisms may involve (1) the potential of direct and inverted repeats to undergo slippage and misalignment and to form quasi-palindromes and (2) the interaction of these sequences with DNA replication and repair proteins.
Symmetry breaking yields chimeras in two small populations of Kuramoto-type oscillators
Creators: name: Burylko, Oleksandr
name: Martens, Erik Andreas
name: Bick, Christian
Publisher: name: arXiv
Year: 2022
Subjects: subject: Adaptation and Self-Organizing Systems (nlin.AO)
subject: FOS: Physical sciences

description: Despite their simplicity, networks of coupled phase oscillators can give rise to intriguing collective dynamical phenomena. However, the symmetries of globally and identically coupled identical units do not allow solutions where distinct oscillators are frequency-unlocked -- a necessary condition for the emergence of chimeras. Thus, forced symmetry breaking is necessary to observe chimera-type solutions. Here, we consider the bifurcations that arise when full permutational symmetry is broken for the network to consist of coupled populations. We consider the smallest possible network composed of four phase oscillators and elucidate the phase space structure, (partial) integrability for some parameter values, and how the bifurcations away from full symmetry lead to frequency-unlocked weak chimera solutions. Since such solutions wind around a torus they must arise in a global bifurcation scenario. Moreover, periodic weak chimeras undergo a period doubling cascade leading to chaos. The resulting chaotic dynamics with distinct frequencies do not rely on amplitude variation and arise in the smallest networks that support chaos.
Classical Boltzmann equation and high-temperature QED
Creators: name: Brandt, F. T.
name: Ferreira, R. B.
name: Thuorst, J. F.
Publisher: name: arXiv
Year: 2015
Subjects: subject: High Energy Physics - Theory (hep-th)
subject: High Energy Physics - Phenomenology (hep-ph)
subject: FOS: Physical sciences

description: The equivalence between thermal field theory and the Boltzmann transport equation is investigated at higher orders in the context of quantum electrodynamics. We compare the contributions obtained from the collisionless transport equation with the high temperature limit of the one-loop thermal Green's function. Our approach employs the representation of the thermal Green's functions in terms of forward scattering amplitudes. The general structure of these amplitudes clearly indicates that the physics described by the leading high temperature limit of quantum electrodynamics can be obtained from the Boltzmann transport equation. We also present some explicit examples of this interesting equivalence.
description: This version contains a minor modification in the sentence after Eq. (2.15) as well as before Eq. (3.13) making the results more general
Lagrangian Grassmannians, CKP hierarchy and hyperdeterminantal relations
Creators: name: Arthamonov, S.
name: Harnad, J.
name: Hurtubise, J.
Publisher: name: arXiv
Year: 2022
Subjects: subject: Mathematical Physics (math-ph)
subject: Algebraic Geometry (math.AG)
subject: Representation Theory (math.RT)
subject: Exactly Solvable and Integrable Systems (nlin.SI)
subject: FOS: Physical sciences
subject: FOS: Mathematics
subject: 70H06, 37K10, 35Q51, 17B80, 39A36, 17B10, 70G45

description: This work concerns the relation between the geometry of Lagrangian Grassmannians and the CKP integrable hierarchy. The Lagrange map from the Lagrangian Grassmannian of maximal isotropic (Lagrangian) subspaces of a finite dimensional symplectic vector space $V\oplus V^*$ into the projectivization of the exterior space $ΛV$ is defined by restricting the Plücker map on the full Grassmannian to the Lagrangian sub-Grassmannian and composing it with projection to the subspace of symmetric elements under dualization $V \leftrightarrow V^*$. In terms of the affine coordinate matrix on the big cell, this reduces to the principal minors map, whose image is cut out by the $2 \times 2 \times 2$ quartic {\em hyperdeterminantal} relations. To apply this to the CKP hierarchy, the Lagrangian Grassmannian framework is extended to infinite dimensions, with $V\oplus V^*$ replaced by a polarized Hilbert space $ {\mathcal H} ={\mathcal H}_+\oplus {\mathcal H}_-$, with symplectic form $ω$. The image of the Plucker map in the fermionic Fock space ${\mathcal F}= Λ^{\infty/2}{\mathcal H}$ is identified and the infinite dimensional Lagrangian map is defined. The linear constraints defining reduction to the CKP hierarchy are expressed as a fermionic null condition and the infinite analogue of the hyperdeterminantal relations is deduced. A multiparametric family of such relations is shown to be satisfied by the evaluation of the $τ$-function at translates of a point in the space of odd flow variables along the cubic lattices generated by power sums in the parameters.
description: 51 pages. The paper was shortened by 15 pages, omitting the detailed derivations of decompositions as a sum of irreducible symplectic modules (in Sections 2.5 and 3.4), and reducing the calculations in the inductive proof in Section 2.7. The abstract has been shortened, a more detailed introductory section has been added and a summary of the results (Section 3.7). References have been updated
title: Evolution of a large coastal nourishment at Knokke: first year progress report
Creators: name: Montreuil, Anne-Lise
name: Dan, Sebastian
name: Verwaest, Toon
Publisher: name: Flanders Hydraulics Research
Year: 2022

description: Beach erosion occurs along a large part of the Belgian coast, especially in the Knokke area. One of the most applied and successful measure to prevent and to cope with erosion is the artificial nourishment of the active beach and shoreface system. Under the framework of this project, a combined large beach and shoreface nourishment of a total approximately 3 million m3 of sand is planned for the Knokke area in the period 2020 – 2025. The aim of this project is to understand the hydrodynamics and morphodynamics of the Knokke area and to evaluate the nourishment efficiency. This first year progress report focuses on a literature review of the coastal morphodynamics and processes along the east Belgian coast from Zeebrugge to Zwin, as well as a pilot campaign of measurements at sea. An inventory of the existing topographic and hydrodynamic data as well as an analysis of the wave regime are presented.
description: Title : FHR reports. Flanders Hydraulics Research: Antwerp Volume : 19_118_1 Issue : Pagination : VIII, 59 + 11 app.
Magnetic fields in anisotropic relativistic stars
Creators: name: Folomeev, Vladimir
name: Dzhunushaliev, Vladimir
Publisher: name: arXiv
Year: 2015
Subjects: subject: General Relativity and Quantum Cosmology (gr-qc)
subject: FOS: Physical sciences

description: Relativistic, spherically symmetric configurations consisting of a gravitating magnetized anisotropic fluid are studied. For such configurations, we obtain static equilibrium solutions with an axisymmetric, poloidal magnetic field produced by toroidal electric currents. The presence of such a field results in small deviations of the shape of the configuration from spherical symmetry. This in turn leads to the modification of an equation for the current and correspondingly to changes in the structure of the internal magnetic field for the systems supported by the anisotropic fluid, in contrast to the case of an isotropic fluid, where such deviations do not affect the magnetic field.
description: 11 pages, 3 figures, typos corrected, version published in PRD
Formation of molecular ions by radiative association of cold trapped atoms and ions
Creators: name: Silva, Humberto Da
name: Raoult, Maurice
name: Aymar, Mireille
name: Dulieu, Olivier
Publisher: name: arXiv
Year: 2015
Subjects: subject: Atomic Physics (physics.atom-ph)
subject: Quantum Physics (quant-ph)
subject: FOS: Physical sciences

description: Radiative emission during cold collisions between trapped laser-cooled Rb atoms and alkaline-earth ions (Ca$^+$, Sr$^+$, Ba$^+$) and Yb$^+$, and between Li and Yb$^+$, are studied theoretically, using accurate effective-core-potential based quantum chemistry calculations of potential energy curves and transition dipole moments of the related molecular ions. Radiative association of molecular ions is predicted to occur for all systems with a cross section two to ten times larger than the radiative charge transfer one. Partial and total rate constants are also calculated and compared to available experiments. Narrow shape resonances are expected, which could be detectable at low temperature with an experimental resolution at the limit of the present standards. Vibrational distributions are also calculated, showing that the final molecular ions are not created in their ground state level.
Universal Prototype Transport for Zero-Shot Action Recognition and Localization
Creators: name: Mettes, Pascal
Publisher: name: arXiv
Year: 2022
Subjects: subject: Computer Vision and Pattern Recognition (cs.CV)
subject: FOS: Computer and information sciences

description: This work addresses the problem of recognizing action categories in videos when no training examples are available. The current state-of-the-art enables such a zero-shot recognition by learning universal mappings from videos to a semantic space, either trained on large-scale seen actions or on objects. While effective, we find that universal action and object mappings are biased to specific regions in the semantic space. These biases lead to a fundamental problem: many unseen action categories are simply never inferred during testing. For example on UCF-101, a quarter of the unseen actions are out of reach with a state-of-the-art universal action model. To that end, this paper introduces universal prototype transport for zero-shot action recognition. The main idea is to re-position the semantic prototypes of unseen actions by matching them to the distribution of all test videos. For universal action models, we propose to match distributions through a hyperspherical optimal transport from unseen action prototypes to the set of all projected test videos. The resulting transport couplings in turn determine the target prototype for each unseen action. Rather than directly using the target prototype as final result, we re-position unseen action prototypes along the geodesic spanned by the original and target prototypes as a form of semantic regularization. For universal object models, we outline a variant that defines target prototypes based on an optimal transport between unseen action prototypes and object prototypes. Empirically, we show that universal prototype transport diminishes the biased selection of unseen action prototypes and boosts both universal action and object models for zero-shot classification and spatio-temporal localization.
Suppressors of an Arabidopsis thaliana phyB mutation identify genes that control light signaling and hypocotyl elongation.
Creators: name: The University of North Carolina at Chapel Hill University Libraries
Publisher: name: The University of North Carolina at Chapel Hill University Libraries
Year: 1998

description: Ambient light controls the development and physiology of plants. The Arabidopsis thaliana photoreceptor phytochrome B (PHYB) regulates developmental light responses at both seedling and adult stages. To identify genes that mediate control of development by light, we screened for suppressors of the long hypocotyl phenotype caused by a phyB mutation. Genetic analyses show that the shy (short hypocotyl) mutations we have isolated fall in several loci. Phenotypes of the mutants suggest that some of the genes identified have functions in control of light responses. Other loci specifically affect cell elongation or expansion.
Impact of Non-Newtonian Droplet on a Liquid Surface
Creators: Bessa, Guilherme M.
Hadfield, Jake
Gopinath, Sutendra
Freed, Darren H.
Nobes, David S.
Publisher: name: University of Alberta Library
Year: 2022

Conference Abstract. Part of the Proceedings of the Canadian Society for Mechanical Engineering International Congress 2022.
Gradient Ascent Pulse Engineering with Feedback
Creators: name: Porotti, Riccardo
name: Peano, Vittorio
name: Marquardt, Florian
Publisher: name: arXiv
Year: 2022
Subjects: subject: Quantum Physics (quant-ph)
subject: FOS: Physical sciences

description: Efficient approaches to quantum control and feedback are essential for quantum technologies, from sensing to quantum computation. Open-loop control tasks have been successfully solved using optimization techniques, including methods like gradient-ascent pulse engineering (GRAPE), relying on a differentiable model of the quantum dynamics. For feedback tasks, such methods are not directly applicable, since the aim is to discover strategies conditioned on measurement outcomes. In this work, we introduce feedback-GRAPE, which borrows some concepts from model-free reinforcement learning to incorporate the response to strong stochastic (discrete or continuous) measurements, while still performing direct gradient ascent through the quantum dynamics. We illustrate its power considering various scenarios based on cavity QED setups. Our method yields interpretable feedback strategies for state preparation and stabilization in the presence of noise. Our approach could be employed for discovering strategies in a wide range of feedback tasks, from calibration of multi-qubit devices to linear-optics quantum computation strategies, quantum-enhanced sensing with adaptive measurements, and quantum error correction.
description: 31 pages, 16 figures
BOSCH: Industrial Commons for Analytics in Manufacturing
Creators: name: Kharlamov, Evgeny
Publisher: name: Zenodo
Year: 2023
Subjects: ontology
standard
data management
global workshop
ontology commons ecosystem
FAIR

description: Existing ontologies have overlooked some crucial concepts essential for the monitoring of sensor measurements and machine components. In addition, current ontologies tend not to be publicly available and cannot be accessed. Therefore, users build their ontologies from scratch. To better this situation, the BOSCH team proposes the Resistance Spot Welding Ontology which combines Bosch welding expertise, ISO-14327 and ISO-14373 standards; and existing established ontologies. RSWO has been evaluatedon real-world data, FAIR principles, OOPS!, OntoMetrics, competency questions, and alignment with relevant ontologies.
A Dimension Spectrum for SLE Boundary Collisions
Creators: name: Alberts, Tom
name: Binder, Ilia
name: Viklund, Fredrik Johansson
Publisher: name: arXiv
Year: 2015
Subjects: subject: Probability (math.PR)
subject: FOS: Mathematics
subject: 60D05 (primary) 60K35, 28A80 (secondary)

description: We consider chordal SLE(kappa) curves for kappa > 4, where the intersection of the curve with the boundary is a random fractal of almost sure Hausdorff dimension min {2-8/kappa,1}. We study the random sets of points at which the curve collides with the real line at a specified "angle" and compute an almost sure dimension spectrum describing the metric size of these sets. We work with the forward SLE flow and a key tool in the analysis is Girsanov's theorem, which is used to study events on which moments concentrate. The two-point correlation estimates are proved using the direct method.
description: 21 pages
A mutation of the yeast gene encoding PCNA destabilizes both microsatellite and minisatellite DNA sequences.
Creators: name: The University of North Carolina at Chapel Hill University Libraries
Publisher: name: The University of North Carolina at Chapel Hill University Libraries
Year: 1999

description: The POL30 gene of the yeast Saccharomyces cerevisiae encodes the proliferating cell nuclear antigen (PCNA), a protein required for processive DNA synthesis by DNA polymerase delta and epsilon. We examined the effects of the pol30-52 mutation on the stability of microsatellite (1- to 8-bp repeat units) and minisatellite (20-bp repeat units) DNA sequences. It had previously been shown that this mutation destabilizes dinucleotide repeats 150-fold and that this effect is primarily due to defects in DNA mismatch repair. From our analysis of the effects of pol30-52 on classes of repetitive DNA with longer repeat unit lengths, we conclude that this mutation may also elevate the rate of DNA polymerase slippage. The effect of pol30-52 on tracts of repetitive DNA with large repeat unit lengths was similar, but not identical, to that observed previously for pol3-t, a temperature-sensitive mutation affecting DNA polymerase delta. Strains with both pol30-52 and pol3-t mutations grew extremely slowly and had minisatellite mutation rates considerably greater than those observed in either single mutant strain.
Dependence of the regulation of telomere length on the type of subtelomeric repeat in the yeast Saccharomyces cerevisiae.
Creators: name: The University of North Carolina at Chapel Hill University Libraries
Publisher: name: The University of North Carolina at Chapel Hill University Libraries
Year: 1999

description: In the yeast Saccharomyces cerevisiae, chromosomes terminate with approximately 400 bp of a simple repeat poly(TG(1-3)). Based on the arrangement of subtelomeric X and Y' repeats, two types of yeast telomeres exist, those with both X and Y' (Y' telomeres) and those with only X (X telomeres). Mutations that result in abnormally short or abnormally long poly(TG(1-3)) tracts have been previously identified. In this study, we investigated telomere length in strains with two classes of mutations, one that resulted in short poly(TG(1-3)) tracts (tel1) and one that resulted in elongated tracts (pif1, rap1-17, rif1, or rif2). In the tel1 pif1 strain, Y' telomeres had about the same length as those in tel1 strains and X telomeres had lengths intermediate between those in tel1 and pif1 strains. Strains with either the tel1 rap1-17 or tel1 rif2 genotypes had short tracts for all chromosome ends examined, demonstrating that the telomere elongation characteristic of rap1-17 and rif2 strains is Tel1p-dependent. In strains of the tel1 rif1 or tel1 rif1 rif2 genotypes, telomeres with Y' repeats had short terminal tracts, whereas most of the X telomeres had long terminal tracts. These results demonstrate that the regulation of telomere length is different for X and Y' telomeres.