cometadata/datacite-rtg-text-other-reclassification-records huggingface dataset:
Hofstadter-like spectrum and Magnetization of Artificial Graphene constructed with cylindrical and elliptical quantum dots
Creators: name: Mansoury, Maryam
name: Mughnetsyan, Vram
name: Manaselyan, Aram
name: Kirakosyan, Albert
name: Gudmundsson, Vidar
name: Aziz-Aghchegala, Vigen
Publisher: name: arXiv
Year: 2023
Subjects: subject: Mesoscale and Nanoscale Physics (cond-mat.mes-hall)
subject: FOS: Physical sciences

description: In this paper a comparative study of the electronic and magnetic properties of quasi-two-dimensional electrons in an artificial graphene-like superlattice composed of circular and elliptical quantum dots is presented. A complete orthonormal set of basis wave functions, which has previously been constructed in the frame of the Coulomb gauge for the vector potential has been implemented for calculation of the energy dispersions, the Hofstadter spectra, the density of states and the orbital magnetization of the considered systems, taking into account both the translational symmetry of the superlattice and the wave function phase-shifts due to the presence of a transverse external magnetic field. Our calculations indicate a topological change in the miniband structure due to the ellipticity of the quantum dots, and non-trivial modifications of the electron energy dispersion surfaces in reciprocal space with the change of the number of magnetic flux quanta through the unit cell of the superlattice. The ellipticity of the QDs leads to an opening of a gap and considerable modifications of the Hofstadter spectrum. The orbital magnetization is shown to reveal significant oscillations with the change of the magnetic flux. The deviation from the circular geometry of quantum dots has a qualitative impact on the dependencies of the magnetization on both the magnetic flux and the temperature.
MS Gr. class. c. 2 322
Creators: name: Oxyrhynchus Papyri
Publisher: name: University of Oxford
Year: 2023
Subjects: classificationCode: 470316
subject: Latin and classical Greek languages

description: P.Herc. 339 col. 13. Philodemus, De Stoicis
Drawing by Giuseppe (?) Casanova
Bullying Situations in Juvenile Fiction Novels: The Role of Teachers and Administrators
Creators: name: Lisanti, Ruby
Publisher: name: The University of North Carolina at Chapel Hill University Libraries
Year: 2014
Subjects: Bullying
Content analysis--Children's literature

description: This study used content analysis to examine eight juvenile fiction novels about bullying. The purpose of this study was to examine how bullying and the role(s) teachers and administrators play in those bullying situations are portrayed in the literature available to students.  Specifically, this paper focused on if and how teachers and administrators dealt with the bullying after it happened, and if they were proactive in addressing and talking about bullying before it happened.  The selected novels were analyzed in depth using a checklist developed from reviewing the criteria outlined in the literature to identify the roles the teachers and administrators play in bullying.  Also, the novels were examined, compared and discussed through the lens of the trends that emerged from a full read of each novel.  Overall, the novels analyzed for this study showed very little to no teacher or administrator involvement in the bullying situations presented in the books.
Counter-flow Induced Decoupling in Super-Fluid Turbulence
Creators: name: Khomenko, Dmytro
name: L'vov, Victor S.
name: Pomyalov, Anna
name: Procaccia, Itamar
Publisher: name: arXiv
Year: 2015
Subjects: subject: Other Condensed Matter (cond-mat.other)
subject: FOS: Physical sciences

description: In mechanically driven superfluid turbulence the mean velocities of the normal- and superfluid components are known to coincide: $\mathbf U_{\text{n}} =\mathbf U_{\text{s}}$. Numerous laboratory, numerical and analytical studies showed that under these conditions the mutual friction between the normal- and superfluid velocity components couples also their fluctuations: $\mathbf u'_{\text{n}}(\mathbf r,t) \approx \mathbf u'_{\text{s}}(\mathbf r,t)$ almost at all scales. In this paper we show that this is not the case in thermally driven superfluid turbulence; here the counterflow velocity $\mathbf U_{\text{ns}}\equiv \mathbf U_{\text{n}} -\mathbf U_{\text{s}}\ne 0$. We suggest a simple analytic model for the cross correlation function $\left\langle \mathbf u'_{\text{n}}(\mathbf r,t) \cdot \mathbf u'_{\text{s}}(\mathbf r',t)\right \rangle$ and its dependence on $U_{\text{ns}}$. We demonstrate that $\mathbf u'_{\text{n}}(\mathbf r,t)$ and $ \mathbf u'_{\text{s}}(\mathbf r,t)$ are decoupled almost in the entire range of separations $|\mathbf r-\mathbf r'|$ between the energy containing scale and intervortex distance.
Upper bounds on spontaneous wave-function collapse models using millikelvin-cooled nanocantilevers
Creators: name: Vinante, A.
name: Bahrami, M.
name: Bassi, A.
name: Usenko, O.
name: Wijts, G.
name: Oosterkamp, T. H.
Publisher: name: arXiv
Year: 2015
Subjects: subject: Quantum Physics (quant-ph)
subject: FOS: Physical sciences

description: Collapse models predict a tiny violation of energy conservation, as a consequence of the spontaneous collapse of the wave function. This property allows to set experimental bounds on their parameters. We consider an ultrasoft magnetically tipped nanocantilever cooled to millikelvin temperature. The thermal noise of the cantilever fundamental mode has been accurately estimated in the range $0.03-1$ K, and any other excess noise is found to be negligible within the experimental uncertainty. From the measured data and the cantilever geometry, we estimate the upper bound on the Continuous Spontaneous Localization (CSL) collapse rate in a wide range of the correlation length $r_C$. Our upper bound improves significantly previous constraints for $r_C>10^{-6}$ m, and partially excludes the enhanced collapse rate suggested by Adler. We discuss future improvements.
description: 11 pages, 9 figures
Theoretical study of triaxial shapes of neutron-rich Mo and Ru nuclei
Creators: name: Zhang, Chunli
name: Bhat, Gowhar
name: Nazarewicz, Witek
name: Sheikh, Javid
name: Shi, Yue
Publisher: name: arXiv
Year: 2015
Subjects: subject: Nuclear Theory (nucl-th)
subject: FOS: Physical sciences

description: Background: Recently, transition quadrupole moments in rotational bands of even-mass neutron-rich isotopes of molybdenum and ruthenium nuclei have been measured. The new data have provided a challenge for theoretical descriptions invoking stable triaxial deformations. Purpose: To understand experimental data on rotational bands in the neutron-rich Mo-Ru region, we carried out theoretical analysis of moments of inertia, shapes, and transition quadrupole moments of neutron-rich even-even nuclei around $^{110}$Ru using self-consistent mean-field and shell model techniques. Methods: To describe yrast structures in Mo and Ru isotopes, we use nuclear Density Functional Theory (DFT) with the optimized energy density functional UNEDF0. We also apply Triaxial Projected Shell Model (TPSM) to describe yrast and positive-parity, near-yrast band structures. Results: Our self-consistent DFT calculations predict triaxial ground-state deformations in $^{106,108}$Mo and $^{108.110,112}$Ru and reproduce the observed low-frequency behavior of moments of inertia. As the rotational frequency increases, a negative-$γ$ structure, associated with the aligned $ν(h_{11/2})^2$ pair, becomes energetically favored. The computed transition quadrupole moments vary with angular momentum, which reflects deformation changes with rotation; those variations are consistent with experiment. The TPSM calculations explain the observed band structures assuming stable triaxial shapes. Conclusions: The structure of neutron-rich even-even nuclei around $^{110}$Ru is consistent with triaxial shape deformations. Our DFT and TPSM frameworks provide a consistent and complementary description of experimental data.
description: 10 pages, 12 figures
Unsupervised Calibration through Prior Adaptation for Text Classification using Large Language Models
Creators: name: Estienne, Lautaro
name: Ferrer, Luciana
name: Vera, Matías
name: Piantanida, Pablo
Publisher: name: arXiv
Year: 2023
Subjects: subject: Computation and Language (cs.CL)
subject: Machine Learning (cs.LG)
subject: FOS: Computer and information sciences

description: A wide variety of natural language tasks are currently being addressed with large-scale language models (LLMs). These models are usually trained with a very large amount of unsupervised text data and adapted to perform a downstream natural language task using methods like fine-tuning, calibration or in-context learning. In this work, we propose an approach to adapt the prior class distribution to perform text classification tasks without the need for labelled samples and only few in-domain sample queries. The proposed approach treats the LLM as a black box, adding a stage where the model posteriors are calibrated to the task. Results show that these methods outperform the un-adapted model for different number of training shots in the prompt and a previous approach were calibration is performed without using any adaptation data.
Comparison of "warm and wet" and "cold and icy" scenarios for early Mars in a 3D climate model
Creators: name: Wordsworth, Robin D.
name: Kerber, Laura
name: Pierrehumbert, Raymond T.
name: Forget, Francois
name: Head, James W.
Publisher: name: arXiv
Year: 2015
Subjects: subject: Earth and Planetary Astrophysics (astro-ph.EP)
subject: FOS: Physical sciences

description: We use a 3D general circulation model to compare the primitive Martian hydrological cycle in "warm and wet" and "cold and icy" scenarios. In the warm and wet scenario, an anomalously high solar flux or intense greenhouse warming artificially added to the climate model are required to maintain warm conditions and an ice-free northern ocean. Precipitation shows strong surface variations, with high rates around Hellas basin and west of Tharsis but low rates around Margaritifer Sinus (where the observed valley network drainage density is nonetheless high). In the cold and icy scenario, snow migration is a function of both obliquity and surface pressure, and limited episodic melting is possible through combinations of seasonal, volcanic and impact forcing. At surface pressures above those required to avoid atmospheric collapse (~0.5 bar) and moderate to high obliquity, snow is transported to the equatorial highland regions where the concentration of valley networks is highest. Snow accumulation in the Aeolis quadrangle is high, indicating an ice-free northern ocean is not required to supply water to Gale crater. At lower surface pressures and obliquities, both H2O and CO2 are trapped as ice at the poles and the equatorial regions become extremely dry. The valley network distribution is positively correlated with snow accumulation produced by the cold and icy simulation at 41.8 degrees obliquity but uncorrelated with precipitation produced by the warm and wet simulation. Because our simulations make specific predictions for precipitation patterns under different climate scenarios, they motivate future targeted geological studies.
description: 20 pages, 14 figures, 2 tables. In press at JGR (Planets)
MS Gr. class. c. 2 323
Creators: name: Oxyrhynchus Papyri
Publisher: name: University of Oxford
Year: 2023
Subjects: classificationCode: 470316
subject: Latin and classical Greek languages

description: P.Herc. 339 col. 14. Philodemus, De Stoicis
Drawing by Giuseppe (?) Casanova
Non-semisimple gauging of a magical N=4 supergravity in three dimensions
Creators: name: Karndumri, Parinya
Publisher: name: arXiv
Year: 2015
Subjects: subject: High Energy Physics - Theory (hep-th)
subject: FOS: Physical sciences

description: We construct a new $N=4$ non-semisimple gauged supergravity in three dimensions with $E_{6(2)}/SU(6)\times SU(2)$ scalar manifold and $SO(4)\ltimes \mathbf{T}^6$ gauge group. Depending on the values of the gauge coupling constants, the theory admits both the maximally supersymmetric $AdS_3$ vacuum preserving $SO(4)$ gauge symmetry and half-supersymmetric domain walls with unbroken $SO(4)$ symmetry. We give all scalar masses at the supersymmetric $AdS_3$ critical point corresponding to an $N=(4,0)$ superconformal field theory (SCFT) in two dimensions. The scalar potential also admits two flat directions corresponding to marginal deformations that preserve full supersymmetry and conformal symmetry. This $SO(4)\ltimes \mathbf{T}^6$ gauged supergravity is expected to arise from a dimensional reduction on a three-sphere of the minimal $N=(1,0)$ supergravity in six dimensions coupled to three tensor and four vector multiplets.
description: 22 pages, no figure, typos and operator dimension corrected
MS Gr. class. c. 2 324
Creators: name: Oxyrhynchus Papyri
Publisher: name: University of Oxford
Year: 2023
Subjects: classificationCode: 470316
subject: Latin and classical Greek languages

description: P.Herc. 339 col. 11. Philodemus, De Stoicis
Drawing by Giuseppe (?) Casanova
A stochastic model of randomly accelerated walkers for human mobility
Creators: name: Gallotti, Riccardo
name: Bazzani, Armando
name: Rambaldi, Sandro
name: Barthelemy, Marc
Publisher: name: arXiv
Year: 2015
Subjects: subject: Physics and Society (physics.soc-ph)
subject: Disordered Systems and Neural Networks (cond-mat.dis-nn)
subject: FOS: Physical sciences

description: The recent availability of large databases allows to study macroscopic properties of many complex systems. However, inferring a model from a fit of empirical data without any knowledge of the dynamics might lead to erroneous interpretations [6]. We illustrate this in the case of human mobility [1-3] and foraging human patterns [4] where empirical long-tailed distributions of jump sizes have been associated to scale-free super-diffusive random walks called Lévy flights [5]. Here, we introduce a new class of accelerated random walks where the velocity changes due to acceleration kicks at random times, which combined with a peaked distribution of travel times [7], displays a jump length distribution that could easily be misinterpreted as a truncated power law, but that is not governed by large fluctuations. This stochastic model allows us to explain empirical observations about the movements of 780,000 private vehicles in Italy, and more generally, to get a deeper quantitative understanding of human mobility.
description: 10 pages, 6 figures + Supplementary information
Slowing down of ring polymer diffusion caused by inter-ring threading
Creators: name: Lee, Eunsang
name: Kim, Soree
name: Jung, YounJoon
Publisher: name: arXiv
Year: 2015
Subjects: subject: Soft Condensed Matter (cond-mat.soft)
subject: FOS: Physical sciences

description: Diffusion of long ring polymers in a melt is much slower than the reorganization of their internal structures. While direct evidences for entanglements have not been observed in the long ring polymers unlike linear polymer melts, threading between the rings is suspected to be the main reason for slowing down of ring polymer diffusion. It is, however, difficult to define the threading configuration between two rings because the rings have no chain end. In this work, evidences for threading dynamics of ring polymers are presented by using molecular dynamics simulation and applying a novel analysis method. The simulation results are analyzed in terms of the statistics of persistence and exchange times that have proved useful in studying heterogeneous dynamics of glassy systems. We find that the threading time of ring polymer melts increases more rapidly with the degree of polymerization than that of linear polymer melts. This indicates that threaded ring polymers cannot diffuse until unthreading event occurs, which results in the slowing down of ring polymer diffusion.
Formation of In-plane Skyrmions in Epitaxial MnSi Thin Films as Revealed by Planar Hall Effect
Creators: name: Yokouchi, T.
name: Kanazawa, N.
name: Tsukazaki, A.
name: Kozuka, Y.
name: Kikkawa, A.
name: Taguchi, Y.
name: Kawasaki, M.
name: Ichikawa, M.
name: Kagawa, F.
name: Tokura, Y.
Publisher: name: arXiv
Year: 2015
Subjects: subject: Strongly Correlated Electrons (cond-mat.str-el)
subject: FOS: Physical sciences

description: We investigate skyrmion formation in both a single crystalline bulk and epitaxial thin films of MnSi by measurements of planar Hall effect. A prominent stepwise field profile of planar Hall effect is observed in the well-established skyrmion phase region in the bulk sample, which is assigned to anisotropic magnetoresistance effect with respect to the magnetic modulation direction. We also detect the characteristic planar Hall anomalies in the thin films under the in-plane magnetic field at low temperatures, which indicates the formation of skyrmion strings lying in the film plane. Uniaxial magnetic anisotropy plays an important role in stabilizing the in-plane skyrmions in the MnSi thin film.
description: 12 pages, 6 figures
MS Gr. class. c. 2 325
Creators: name: Oxyrhynchus Papyri
Publisher: name: University of Oxford
Year: 2023
Subjects: classificationCode: 470316
subject: Latin and classical Greek languages

description: P.Herc. 339 col. 15. Philodemus, De Stoicis
Drawing by Giuseppe (?) Casanova
Hadronic light-by-light contribution to $a_μ$: extended Nambu-Jona-Lasinio, chiral quark models and chiral Lagrangians
Creators: name: Bijnens, Johan
Publisher: name: arXiv
Year: 2015
Subjects: subject: High Energy Physics - Phenomenology (hep-ph)
subject: FOS: Physical sciences

description: This talk discusses our old work on the hadronic light-by-light contribution to the muon anomalous magnetic moment and some more recent contributions. I discuss the various contributions starting with pseudo-scalar meson exchange, the quark- and pion-loop, as well as scalar and $a_1$-exchange. For the $π^0$-exchange I point out a possible large enhancement when only connected contributions are included. For the quark-loop I include some comments about the more recent estimates of this contribution. The pion-loop is discussed in more detail, in particular I discuss our unpublished work on including effects from $a_1$ and the polarizability.
description: 8 pages, talk presented at FCCP2015 - Workshop on "Flavour changing and conserving processes," 10-12 September 2015, Anacapri, Capri Island, Italy
Toy model for traffic flow splitting
Creators: name: Blinkin, Mikhail
name: Gasnikov, Alexander
name: Omelchenko, Sergey
name: Usik, Inna
Publisher: name: arXiv
Year: 2016
Subjects: subject: Optimization and Control (math.OC)
subject: FOS: Mathematics

description: We propose a simple dynamic model splitting users of the transport network by type of movement: personal transport and public transport. A distinctive feature proposed in the article is the existence of an evolutionary approach component in the justification of the method of splitting.
description: 8 pages, in Russian
Redefining Archaeology and the Ethno-history of Pre-colonial Singhbhum
Creators: name: Sen, Asoka
Publisher: name: figshare
Year: 2023
Subjects: Sociology of migration, ethnicity and multiculturalism
Other Indigenous studies not elsewhere classified

description: Abstract: Conventionally archaeology stands for the remains of cities, palaces, temples, statues etc as well as numismatic findings often emanating from centralized power centres. As these remains often do not historicize ethnic communities, we are forced to redefine the very term archaeology when we attempt a reconstruction of ethno-history. But as we redefine archaeology to include survivals of a different genre, like ponds, mango groves, sasandiri (gravestone) and evidences of linguistic archaeology such as villages and names of arable lands, a new vista of information opens up. In the absence of centralized polity, these remains were mostly promoted by the community and constitute a different genre of archaeology that may be termed as social rather than community archaeology. With this inclusive archaeology, this essay seeks to reconstruct the ethno-history of the pre-colonial Singhbhum, the available corpus of which is both sparse and fragmentary. The reason for this ethnographic lack could be the lingering faith in the conventional meaning of archaeology the remains of which, in Singhbhum, mostly belong to the time and the people that either predated the advent of the tribal groups or related non-tribal people living here. These often create the notion of specific cultural spaces that embody archaeological layers representing multiple village histories. As Bernard Cohn said, ‘There is not one past of the village but many.'
A new type of coupled fixed point theorem in partially ordered complete metric space
Creators: name: Yildirim, Isa
Publisher: name: arXiv
Year: 2015
Subjects: subject: General Topology (math.GN)
subject: FOS: Mathematics
subject: 54H10, 54H25

description: In this paper, we introduce a new type of coupled fixed point theorem in partially ordered complete metric space. We give an example to support of our result.
description: arXiv admin note: text overlap with arXiv:1103.5285 by other authors
MS Gr. class. c. 2 326
Creators: name: Oxyrhynchus Papyri
Publisher: name: University of Oxford
Year: 2023
Subjects: classificationCode: 470316
subject: Latin and classical Greek languages

description: P.Herc. 339 col. 22. Philodemus, De Stoicis
Drawing by Giuseppe (?) Casanova
Finding common ground: a survey of young adults' perceptions of the public library
Creators: name: Pierce, Kathleen M.
Publisher: name: The University of North Carolina at Chapel Hill University Libraries
Year: 2005
Subjects: Library surveys
Public libraries--Services to teenagers
Libraries and teenagers

description: Young adults are an under-served portion of public library patrons. Despite the help that they could be offering this age group, public libraries are not appealing places for young adults. This research paper details the results of a survey administered to high school juniors in central North Carolina that attempts to answer the question of how public libraries can better serve young adults, both in terms of materials and programs offered, and also in terms of a comfortable physical space that teens will enjoy.
Effect of Stone-Wales defects on the thermal conductivity of graphene
Creators: name: Krasavin, S. E.
name: Osipov, V. A.
Publisher: name: arXiv
Year: 2015
Subjects: subject: Materials Science (cond-mat.mtrl-sci)
subject: FOS: Physical sciences

description: The problem of phonon scattering by strain fields caused by Stone-Wales (SW) defects in graphene is studied in the framework of the deformation potential approach. An explicit form of the phonon mean free path due to phonon-SW scattering is obtained within the Born approximation. The mean free path demonstrates a specific $q$-dependence varying as $q^{-3}$ at low wavevectors and taking a constant value at large $q$. The thermal conductivity of graphene nanoribbons (GNRs) is calculated with the three-phonon umklapp, SW and rough edge scatterings taken into account. A pronounced decrease of the thermal conductivity due to SW defects is found at low temperatures whereas at room temperatures and above the phonon-phonon umklapp scattering becomes dominant. A comparison with the case of vacancy defects shows that they play more important role in the reduction of the thermal conductivity in GNRs over a wide temperature range.
description: 9 pages, 5 figures
Competition between Kondo screening and quantum Hall edge reconstruction
Creators: name: Heine, A. W.
name: Tutuc, D.
name: Zwicknagl, G.
name: Haug, R. J.
Publisher: name: arXiv
Year: 2015
Subjects: subject: Mesoscale and Nanoscale Physics (cond-mat.mes-hall)
subject: FOS: Physical sciences

description: We report on a Kondo correlated quantum dot connected to two-dimensional leads where we demonstrate the renormalization of the g-factor in the pure Zeeman case i.e, for magnetic fields parallel to the plane of the quantum dot. For the same system we study the influence of orbital effects by investigating the quantum Hall regime i.e. a perpendicular magnetic field is applied. In this case an unusual behaviour of the suppression of the Kondo effect and of the split zero-bias anomaly is observed. The splitting decreases with magnetic field and shows discontinuous changes which are attributed to the intricate interplay between Kondo screening and the quantum Hall edge structure originating from electrostatic screening. This edge structure made up of compressible and incompressible stripes strongly affects the Kondo temperature of the quantum dot and thereby influences the renormalized g-factor.
Caroxylon glabrum Mucina 2017, comb. nov.
Creators: name: Mucina, Ladislav
Publisher: name: Zenodo
Year: 2017
Subjects: Biodiversity
Taxonomy
Plantae
Tracheophyta
Magnoliopsida
Caryophyllales
Amaranthaceae
Caroxylon
Caroxylon glabrum

description: 42. Caroxylon glabrum (Botsch.) Mucina comb. nov.
 Basionym: ― Salsola glabra Botsch. in Botanicheskii Zhurnal 59: 39 (1974d).
 Type: ― SOUTH-WEST AFRICA [NAMIBIA]. Dist. Omaruru: 20 Meilen nördlich Cape Cross, Strandvegetationsstreifen, 12 February 1966, Giess 9139 (holotype M-0107428!; isotypes PRE-0375552-0!, WIND!).
 Distribution: ― Namibia: Skeleton Coast.
description: Published as part of Mucina, Ladislav, 2017, Caroxylon (Chenopodiaceae s. str.) in continental southern Africa and Madagascar: a preliminary nomenclatural synopsis and biogeographical considerations, pp. 151-178 in Phytotaxa 312 (2) on page 163, DOI: 10.11646/phytotaxa.312.2.1, http://zenodo.org/record/13701544
Quantum decay of the supercurrent and intrinsic capacitance of Josephson junctions beyond the tunnel limit
Creators: name: Antonenko, D. S.
name: Skvortsov, M. A.
Publisher: name: arXiv
Year: 2015
Subjects: subject: Superconductivity (cond-mat.supr-con)
subject: Disordered Systems and Neural Networks (cond-mat.dis-nn)
subject: Mesoscale and Nanoscale Physics (cond-mat.mes-hall)
subject: FOS: Physical sciences

description: A nondissipative supercurrent state of a Josephson junction is metastable with respect to the formation of a finite-resistance state. This transition is driven by fluctuations, thermal at high temperatures and quantum at low temperatures. We evaluate the life time of such a state due to quantum fluctuations in the limit when the supercurrent is approaching the critical current. The decay probability is determined by the instanton action for the superconducting phase difference across the junction. At low temperatures, dynamics of the phase is massive and is determined by the effective capacitance, which is a sum of the geometric and intrinsic capacitance of the junction. We model the central part of the Josephson junction either by an arbitrary short mesoscopic conductor described by the set of its transmission coefficients, or by a diffusive wire of an arbitrary length. The intrinsic capacitance can generally be estimated as $C_* \sim G/E_g$, where $G$ is the normal-state conductance of the junction and $E_g$ is the proximity minigap in its normal part. The obtained capacitance is sufficiently large to qualitatively explain hysteretic behavior of the current-voltage characteristic even in the absence of overheating.
description: 11 pages, 4 figures; minor corrections, references added
Knowledge Retention Challenges in Information Systems Development Teams: A revelatory story from developers in New Zealand
Creators: name: Chiu, Yi-Te
name: Mirkovski, Kristijan
name: Cranefield, Jocelyn
name: Shankar, Shruthi
Publisher: name: Open Access Te Herenga Waka-Victoria University of Wellington
Year: 2022
Subjects: subject: Information Systems
subject: FOS: Computer and information sciences
subject: Library and Information Studies
subject: FOS: Media and communications
subject: Data Format

description: Information systems development (ISD) is an integral part of organizational agility in today’s competitive business environment. High turnover, agile ways of working, and fluid work environments pose challenges for ISD. This paper explores the erosion of knowledge retention (KR) arising from ISD staff churn in a New Zealand-based financial organization in the aftermath of a major earthquake. In this exploratory study, the authors develop a causal model of KR in the ISD context, which articulates the challenges to and consequences of ineffective KR at the routine and exiting stages of KR. The model identifies four challenges—coordination complexity, insufficient resources for knowledge retention, insufficient attention to knowledge retention, and slow staff replacement and handover processes—that can affect the loss of ISD knowledge when routine and exiting KR fall into disarray. This study also reveals that role stress and reduced ISD agility reinforce the cycle of knowledge loss.
The Hitchhiker's Guide to Malicious Third-Party Dependencies
Creators: name: Ladisa, Piergiorgio
name: Sahin, Merve
name: Ponta, Serena Elisa
name: Rosa, Marco
name: Martinez, Matias
name: Barais, Olivier
Publisher: name: arXiv
Year: 2023
Subjects: subject: Cryptography and Security (cs.CR)
subject: FOS: Computer and information sciences

description: The increasing popularity of certain programming languages has spurred the creation of ecosystem-specific package repositories and package managers. Such repositories (e.g., npm, PyPI) serve as public databases that users can query to retrieve packages for various functionalities, whereas package managers automatically handle dependency resolution and package installation on the client side. These mechanisms enhance software modularization and accelerate implementation. However, they have become a target for malicious actors seeking to propagate malware on a large scale. In this work, we show how attackers can leverage capabilities of popular package managers and languages to achieve arbitrary code execution on victim machines, thereby realizing open-source software supply chain attacks. Based on the analysis of 7 ecosystems, we identify 3 install-time and 4 runtime techniques, and we provide recommendations describing how to reduce the risk when consuming third-party dependencies. We will provide proof-of-concepts that demonstrate the identified techniques. Furthermore, we describe evasion strategies employed by attackers to circumvent detection mechanisms.
description: Proceedings of the 2023 Workshop on Software Supply Chain Offensive Research and Ecosystem Defenses (SCORED '23), November 30, 2023, Copenhagen, Denmark
Caroxylon henriciae Mucina 2017, comb. nov.
Creators: name: Mucina, Ladislav
Publisher: name: Zenodo
Year: 2017
Subjects: Biodiversity
Taxonomy
Plantae
Tracheophyta
Magnoliopsida
Caryophyllales
Amaranthaceae
Caroxylon
Caroxylon henriciae

description: 43. Caroxylon henriciae (I.Verd.) Mucina comb. nov.
 Basionym: ― Salsola henriciae I.Verd. in Journal of South African Botany 29, 1: 5, fig. 1, 2a (1963).
 Type: ― SOUTH AFRICA. Orange Free State [Free State Prov.]: Dist. Luckhoff, Rosemarie, brakveld near fence along Jacobsdal road, 21 April 1945, Henrici 3897 (holotype PRE-0375403-0!).
 Distribution: ― South Africa (FS, NC): eastern Upper Karoo, Griqualand West, western Free State.
description: Published as part of Mucina, Ladislav, 2017, Caroxylon (Chenopodiaceae s. str.) in continental southern Africa and Madagascar: a preliminary nomenclatural synopsis and biogeographical considerations, pp. 151-178 in Phytotaxa 312 (2) on page 163, DOI: 10.11646/phytotaxa.312.2.1, http://zenodo.org/record/13701544
Is pentaquark doublet a hadronic molecule?
Creators: name: Mironov, A.
name: Morozov, A.
Publisher: name: arXiv
Year: 2015
Subjects: subject: High Energy Physics - Phenomenology (hep-ph)
subject: High Energy Physics - Theory (hep-th)
subject: FOS: Physical sciences

description: A recently announced discovery by LHCb of a doublet of overlapping pentaquark resonances poses a question of what can be the origin of this doublet structure. We attract attention to the fact that such degeneracy could naturally arise if constituent "baryon" and "meson" were in the colored rather than colorless states. This is an appealing possibility, also because in such a case the pentaquark state would be no less "elementary" than the other hadrons, and would provide a chance for essentially new non-Abelian chemistry.
description: 4 pages
Caroxylon hoanibicum Mucina 2017, comb. nov.
Creators: name: Mucina, Ladislav
Publisher: name: Zenodo
Year: 2017
Subjects: Biodiversity
Taxonomy
Plantae
Tracheophyta
Magnoliopsida
Caryophyllales
Amaranthaceae
Caroxylon
Caroxylon hoanibicum

description: 44. Caroxylon hoanibicum (Botsch.) Mucina comb. nov.
 Basionym: ― Salsola hoanibica Botsch. in Botanicheskii Zhurnal 68(9): 1247 (1983).
 Type: ― SOUTH-WEST AFRICA [NAMIBIA]. Hoanib Mouth (1912 BD): östlich von Mövebucht bei Oase, 30 November 1978, Giess 15315 (holotype M-0107426!; isotypes LE-00011874!, PRE-0540813-0!, WIND!).
 Distribution: ― Namibia: Skeleton Coast (Möwe Bay).
description: Published as part of Mucina, Ladislav, 2017, Caroxylon (Chenopodiaceae s. str.) in continental southern Africa and Madagascar: a preliminary nomenclatural synopsis and biogeographical considerations, pp. 151-178 in Phytotaxa 312 (2) on page 163, DOI: 10.11646/phytotaxa.312.2.1, http://zenodo.org/record/13701544
Propagation dynamics of a light beam in fractional Schr\"odinger equation
Creators: name: Zhang, Yiqi
name: Liu, Xing
name: Belić, Milivoj R.
name: Zhong, Weiping
name: Zhang, Yanpeng
name: Xiao, Min
Publisher: name: arXiv
Year: 2015
Subjects: subject: Optics (physics.optics)
subject: Quantum Physics (quant-ph)
subject: FOS: Physical sciences

description: Dynamics of wavepackets in fractional Schrodinger equation is still an open problem. The difficulty stems from the fact that the fractional Laplacian derivative is essentially a nonlocal operator. We investigate analytically and numerically the propagation of optical beams in fractional Schr\"odinger equation with a harmonic potential. We find that the propagation of one- and two-dimensional (1D, 2D) input chirped Gaussian beams is not harmonic. In 1D, the beam propagates along a zigzag trajectory in the real space, which corresponds to a modulated anharmonic oscillation in the momentum space. In 2D, the input Gaussian beam evolves into a breathing ring structure in both real and momentum spaces, which forms a filamented funnel-like aperiodic structure. The beams remain localized in propagation, but with increasing distance display increasingly irregular behavior, unless both the linear chirp and the transverse displacement of the incident beam are zero.
description: 7 pages, 5 figures, Phys. Rev. Lett., in press
Excitation of surface and volume plasmons in metal nanocluster by fast electrons
Creators: name: Gildenburg, V. B.
name: Kostin, V. A.
name: Pavlichenko, I. A.
Publisher: name: arXiv
Year: 2015
Subjects: subject: Plasma Physics (physics.plasm-ph)
subject: Atomic and Molecular Clusters (physics.atm-clus)
subject: FOS: Physical sciences

description: Surface and volume plasmons excited in a metal cluster by moving electron and corresponding inelastic scattering spectra are studied based on the hydrodynamic approach. Along with the bulk losses traditionally taken into account, the surface and radiative ones are also considered as the physical mechanisms responsible for the plasmon damping. The second and third mechanisms are found to be essential for the surface plasmons and depend very differently on the multipole mode order. The differential equations are obtained which describe the temporal evolution of every particular mode as that one of a linear oscillator excited by the given external force, and the electron energy loss spectra are calculated. The changes in spectrum shape with the impact parameter and with the electron passage time are analyzed and found to be in good enough agreement with the data of scanning transmission electron microscopy (STEM) experiments. It is shown that, in the general case, a pronounced contribution to the formation of the loss spectrum is given by the both surface and volume plasmons with low and high multipole indices. In particular, at long electron passage time, the integral loss spectrum which is calculated for the free-electron cluster model contains two main peaks: a broad peak from merging of many high-order multipole resonances of the surface plasmons and a narrower peak of nearly the same height from merged volume plasmons excited by the electrons that travel through the central region of the cluster. Comparatively complex dependences of the calculated excitation coefficients and damping constants of various plasmons on the order of the excited multipole result in wide diversity of possible types of the loss spectrum even for the same cluster material and should be taken into account in interpretation of corresponding electron energy loss spectroscopy (EELS) experiments.
description: 16 pages, 3 figures
Inverse design and experimental realization of plasma metamaterials
Creators: name: Rodriguez, Jesse A.
name: Cappelli, Mark A.
Publisher: name: arXiv
Year: 2023
Subjects: subject: Plasma Physics (physics.plasm-ph)
subject: Applied Physics (physics.app-ph)
subject: Optics (physics.optics)
subject: FOS: Physical sciences

description: We apply inverse design methods to produce two-dimensional triangular-lattice plasma metamaterial (PMM) devices which are then constructed and demonstrated experimentally. Finite difference frequency domain simulations are used along with forward-mode automatic differentiation to optimize the plasma densities of each of the plasma elements in the PMM to perform beam steering and demultiplexing under transverse magnetic polarization. The optimal device parameters are then used to assign plasma density values to elements that make up an experimental version of the device. Device performance is evaluated against both the simulated results and human-designed alternatives, showing the benefits and disadvantages of in-silico inverse design and paving the way for future fully in-situ optimization.
description: 22 pages, 8 figures
title: Text/Conference Paper
Creators: name: Nachmann, Imke
name: Rumpe, Bernhard
name: Stachon, Max
name: Stüber, Sebastian
Publisher: name: Gesellschaft für Informatik e.V.
Year: 2022
Subjects: subject: Class Diagrams
subject: Open-World Semantics
subject: Closed-World Semantics
subject: Semantic Differences

description: Class Diagrams (CDs) model data structures in object-oriented systems and evolve throughout the course of the development process. Analyzing the semantic differences between consecutive versions of a CD is crucial to detect unintended changes of the modeled structures and involves comparing the sets of valid object models of both CDs. Established definitions of CD-semantics employ a closed-world assumption for the validity of object structures, which may not fit all stages of the development process. In this paper, we provide different definitions of CD-semantics and discuss their validity, relationship and limitations in the context of semantic evolution analysis. We show that the closed-world semantics of a CD is a subset of its open-world semantics and how this can be used for analyzing model-evolution. We also consider objects both as simple datastructures, as well as instances of (super-)classes and interfaces, and analyze how these approaches affect refinement and refactoring.
Matter accretion onto the magnetically charged Euler-Heisenberg black hole with scalar hair
Creators: name: Rehman, H.
name: Abbas, G.
name: Zhu, Tao
name: Mustafa, G.
Publisher: name: arXiv
Year: 2023
Subjects: subject: General Relativity and Quantum Cosmology (gr-qc)
subject: High Energy Astrophysical Phenomena (astro-ph.HE)
subject: FOS: Physical sciences

description: This paper deals with astrophysical accretion onto the magnetically charged Euler-Heisenberg black holes with scalar hair. We examine the accretion process of a variety of perfect fluids, including polytropic and isothermal fluids of the ultra-stiff, ultra-relativistic, and sub-relativistic forms, when fluid is accreting in the vicinity of the black hole. By using the Hamiltonian dynamical approach, we can find the sonic or critical points numerically for the various types of fluids that are accreting onto the black hole. Furthermore, for several types of fluids, the solution is provided in closed form, expressing phase diagram curves. We compute the mass accretion rate of a magnetically charged Euler-Heisenberg black hole with scalar hair. We observe that the maximum accretion rate is attained for small values of the black hole parameters. We may be able to understand the physical mechanism of accretion onto black holes using the outcomes of this investigation.
description: 16 pages, 7 figures, and 6 tables; v2: version published in EPJC
title: Text/Conference Paper
Creators: name: Thalheim, Bernhard
Publisher: name: Gesellschaft für Informatik e.V.
Year: 2022
Subjects: subject: Modellkunde
subject: Modelle
subject: Modellieren
subject: Modellsein

description: Modelle werden genutzt, (1) um sich eine Vorstellung zu machen, (2) um Handlungen jeder Art systematisch zu ordnen und zu begleiten, (3) um Auffassungen, Vorstellungen und Wissen zu verinnerlichen bzw. zu entwickeln und (4) um das soziale und interaktive Leben zu begleiten. Modelle wurden zu allen Zeiten entwickelt und verwendet. Modelle sind kleine Zusammenstellungen, um in der großen und komplexen Welt zurechtzukommen. Sie sind auf den menschlichen Gebrauch ausgerichtet und auch dem menschlichen Auffassungsvermögen angepaßt. Sie werden in der Wissenschaft und im Ingenieurwesen ebenso intensiv genutzt wie im täglichen Leben. Alles kann zum Modell werden, d. h. das Modellsein kann allem zeitweise auf wechselnder Grundlage zugeordnet werden. Die Modellkunde systematisiert, homogenisiert und verallgemeinert die Erkenntnisse, Herangehensweisen und Nutzungsweisen von Modellen und vom Modellieren zu einer Kunst der Modellentwicklung und -nutzung. Modelle unterstützen in expliziter oder auch impliziter Form beim Wahrnehmen, Beurteilen, Erwarten, Denken, Sozialisieren, Entscheiden und Handeln.
Phagraphene: A Low-energy Graphene Allotrope composed of 5-6-7 Carbon Rings with Distorted Dirac Cones
Creators: name: Wang, Zhenhai
name: Zhou, Xiang-Feng
name: Zhang, Xiaoming
name: Zhu, Qiang
name: Dong, Huafeng
name: Zhao, Mingwen
name: Oganov, Artem R.
Publisher: name: arXiv
Year: 2015
Subjects: subject: Materials Science (cond-mat.mtrl-sci)
subject: FOS: Physical sciences

description: Using systematic evolutionary structure searching we propose a new carbon allotrope, phagraphene, standing for penta-hexa-hepta-graphene, because the structure is composed of 5-6-7 carbon rings. This two-dimensional (2D) carbon structure is lower in energy than most of the predicted 2D carbon allotropes due to its sp2-hybridization and density of atomic packing comparable to graphene. More interestingly, the electronic structure of phagraphene has distorted Dirac cones. The direction-dependent cones are further proved to be robust against external strain with tunable Fermi velocities.
description: 5 pages, 3 figures
A Simple Electrode Insulation and Channel Fabrication Technique for High-Electric Field Microfluidics
Creators: name: Anand, Gaurav
name: Safaripour, Samira
name: Tercovich, Jaynie
name: Capozzi, Jenna
name: Griffin, Mark
name: Schin, Nathan
name: Mirra, Nicholas
name: Snoeyink, Craig
Publisher: name: arXiv
Year: 2023
Subjects: subject: Applied Physics (physics.app-ph)
subject: Fluid Dynamics (physics.flu-dyn)
subject: FOS: Physical sciences

description: A simple and robust electrode insulation technique that can withstand a voltage as high as $\mathrm{1000~V}$, which is equivalent to an electric field strength of $\sim 1MV/m$ across a $\mathrm{10~μm}$ channel filled with an electrolyte of conductivity $\sim 0.1~S/m$, i.e., higher than sea water's conductivity, is introduced. A multi-dielectric layers approach is adopted to fabricate the blocked electrodes, which helps reduce the number of material defects. Dielectric insulation with an exceptional breakdown electric field strength for an electrolyte confined between electrodes can have a wide range of applications in microfluidics, like high electric field strength-based dielectrophoresis. The voltage-current characteristics are studied for various concentrations of sodium chloride solution to estimate the insulation strength of the proposed materials, and the breakdown strength is calculated at the point where the electrical insulation failed. A detailed adhesion technique is also demonstrated, which will reduce the ambiguity around the fabrication of a sealed channel using SU-8.
description: 12 pages
Caroxylon hottentotticum Mucina 2017, comb. nov.
Creators: name: Mucina, Ladislav
Publisher: name: Zenodo
Year: 2017
Subjects: Biodiversity
Taxonomy
Plantae
Tracheophyta
Magnoliopsida
Caryophyllales
Amaranthaceae
Caroxylon
Caroxylon hottentotticum

description: 45. Caroxylon hottentotticum (Botsch.) Mucina comb. nov.
 Basionym: ― Salsola hottentottica Botsch. in Botanicheskii Zhurnal 63: 833 (1978).
 Type: ― SOUTH-WEST AFRICA [NAMIBIA]. Hottentotten Bay: 10 January 1974, Giess & Robinson 13165 (holotype M-0107425!; isotypess PRE-0614485-0!, WIND!).
 Distribution: ― Namibia: Namib Desert coast (Hottentotsbaai NNW of Lüderitz).
description: Published as part of Mucina, Ladislav, 2017, Caroxylon (Chenopodiaceae s. str.) in continental southern Africa and Madagascar: a preliminary nomenclatural synopsis and biogeographical considerations, pp. 151-178 in Phytotaxa 312 (2) on page 164, DOI: 10.11646/phytotaxa.312.2.1, http://zenodo.org/record/13701544
Andreev spin-noise detector
Creators: name: Capecelatro, Roberto
name: Brosco, Valentina
name: Campagnano, Gabriele
name: Lucignano, Procolo
Publisher: name: arXiv
Year: 2023
Subjects: subject: Superconductivity (cond-mat.supr-con)
subject: Mesoscale and Nanoscale Physics (cond-mat.mes-hall)
subject: FOS: Physical sciences

description: We investigate the possibility to employ magnetic Josephson junctions as magnetic-noise detectors. To illustrate our idea, we consider a system consisting of a quantum dot coupled to superconducting leads in the presence of an external magnetic field. Under appropriate assumptions, we relate the noise in the Josephson current to magnetization noise. At the magnetic field driven $0-π$ transition the junction sensitivity as magnetic noise detector is strongly enhanced and it diverges in the zero temperature limit. Moreover, we demonstrate that, if also dot energy is affected by fluctuations, only the magnetic noise channel contributes to Josephson current noise response when the quantum dot is tuned in resonance with superconducting leads.
description: Review. 14 pages. 3 appendices. 14 figures
Nucleobase-functionalized graphene nanoribbons for accurate high-speed DNA sequencing
Creators: name: Paulechka, Eugene
name: Wassenaar, Tsjerk A.
name: Kroenlein, Kenneth
name: Kazakov, Andrei
name: Smolyanitsky, Alex
Publisher: name: arXiv
Year: 2015
Subjects: subject: Mesoscale and Nanoscale Physics (cond-mat.mes-hall)
subject: FOS: Physical sciences

description: We propose a water-immersed nucleobase-functionalized suspended graphene nanoribbon as an intrinsically selective device for nucleotide detection. The proposed sensing method combines Watson-Crick selective base pairing with graphene's capacity for converting anisotropic lattice strain to changes in an electrical current at the nanoscale. Using detailed atomistic molecular dynamics simulations, we study sensor operation at ambient conditions. We combine simulated data with theoretical arguments to estimate the levels of measurable electrical signal variation in response to strains and determine that the proposed sensing mechanism shows significant promise for realistic DNA sensing devices without the need for advanced data processing, or highly restrictive operational conditions.