cometadata/datacite-rtg-text-other-reclassification-records huggingface dataset:
Graph Representation Learning for Spatial Image Steganalysis
Creators: name: Liu, Qiyun
name: Wu, Hanzhou
Publisher: name: arXiv
Year: 2021
Subjects: subject: Multimedia (cs.MM)
subject: Computer Vision and Pattern Recognition (cs.CV)
subject: Image and Video Processing (eess.IV)
subject: FOS: Computer and information sciences
subject: FOS: Electrical engineering, electronic engineering, information engineering

description: In this paper, we introduce a graph representation learning architecture for spatial image steganalysis, which is motivated by the assumption that steganographic modifications unavoidably distort the statistical characteristics of the hidden graph features derived from cover images. In the detailed architecture, we translate each image to a graph, where nodes represent the patches of the image and edges indicate the local relationships between the patches. Each node is associated with a feature vector determined from the corresponding patch by a shallow convolutional neural network (CNN) structure. By feeding the graph to an attention network, the discriminative features can be learned for efficient steganalysis. Experiments indicate that the reported architecture achieves a competitive performance compared to the benchmark CNN model, which has shown the potential of graph learning for steganalysis.
description: https://scholar.google.com/citations?user=IdiF7M0AAAAJ&hl=en
Variability of the Reconnection Guide Field in Solar Flares
Creators: name: Dahlin, Joel T.
name: Antiochos, Spiro K.
name: Qiu, Jiong
name: DeVore, C. Richard
Publisher: name: arXiv
Year: 2021
Subjects: subject: Solar and Stellar Astrophysics (astro-ph.SR)
subject: Space Physics (physics.space-ph)
subject: FOS: Physical sciences

description: Solar flares may be the best-known examples of the explosive conversion of magnetic energy into bulk motion, plasma heating, and particle acceleration via magnetic reconnection. The energy source for all flares is the highly sheared magnetic field of a filament channel above a polarity inversion line (PIL). During the flare, this shear field becomes the so-called reconnection guide field (i.e., the non-reconnecting component), which has been shown to play a major role in determining key properties of the reconnection including the efficiency of particle acceleration. We present new high-resolution, three-dimensional, magnetohydrodynamics simulations that reveal the detailed evolution of the magnetic shear/guide field throughout an eruptive flare. The magnetic shear evolves in three distinct phases: shear first builds up in a narrow region about the PIL, then expands outward to form a thin vertical current sheet, and finally is transferred by flare reconnection into an arcade of sheared flare loops and an erupting flux rope. We demonstrate how the guide field may be inferred from observations of the sheared flare loops. Our results indicate that initially the guide field is larger by about a factor of 5 than the reconnecting component, but it weakens by more than an order of magnitude over the course of the flare. Instantaneously, the guide field also varies spatially over a similar range along the three-dimensional current sheet. We discuss the implications of the remarkable variability of the guide field for the timing and localization of efficient particle acceleration in flares.
description: 15 pages, published in the Astrophysical Journal
Thermal transport, geometry, and anomalies
Creators: name: Chernodub, Maxim N.
name: Ferreiros, Yago
name: Grushin, Adolfo G.
name: Landsteiner, Karl
name: Vozmediano, María A. H.
Publisher: name: arXiv
Year: 2021
Subjects: subject: Mesoscale and Nanoscale Physics (cond-mat.mes-hall)
subject: Materials Science (cond-mat.mtrl-sci)
subject: High Energy Physics - Theory (hep-th)
subject: FOS: Physical sciences

description: The relation between thermal transport and gravity was highlighted in the seminal work by Luttinger in 1964, and has been extensively developed to understand thermal transport, most notably the thermal Hall effect. Here we review the novel concepts that relate thermal transport, the geometry of space-time and quantum field theory anomalies. We give emphasis to the cross-pollination between emergent ideas in condensed matter, notably Weyl and Dirac semimetals, and the understanding of gravitational and scale anomalies stemming from high-energy physics. We finish by relating to recent experimental advances and presenting a perspective of several open problems.
description: 68 pages, 13 figures; comments welcome!
On exact overlaps for $\mathfrak{gl}(N)$ symmetric spin chains
Creators: name: Gombor, Tamás
Publisher: name: arXiv
Year: 2021
Subjects: subject: High Energy Physics - Theory (hep-th)
subject: Mathematical Physics (math-ph)
subject: Exactly Solvable and Integrable Systems (nlin.SI)
subject: FOS: Physical sciences

description: We study the integrable two-site states of the quantum integrable models solvable by the nested algebraic Bethe ansatz and possessing $\mathfrak{gl}(N)$-invariant R-matrix. We investigate the overlaps between the integrable two-site states and the wave-functions. To find exact derivations for the factorized overlap formulas for the nested integrable systems is a longstanding unsolved problem. In this paper we give a derivation for a large class of the integrable states of the $\mathfrak{gl}(N)$ symmetric spin chain. The first part of the derivation is to calculate recurrence relations for the off-shell overlap that uniquely fix it. Using these recursions we prove that the normalized overlaps of the multi-particle states have factorized forms which contain the products of the one-particle overlaps and the ratio of the Gaudin-like determinants. We also show that the previously proposed overlap formulas agree with our general formula.
description: 79 pages, accepted version (Nucl.Phys.B)
A note on exponential Riesz bases
Creators: name: Caragea, Andrei
name: Lee, Dae Gwan
Publisher: name: arXiv
Year: 2021
Subjects: subject: Classical Analysis and ODEs (math.CA)
subject: FOS: Mathematics
subject: 42C15

description: We prove that if $I_\ell = [a_\ell,b_\ell)$, $\ell=1, \ldots, L$, are disjoint intervals in $[0,1)$ with the property that the numbers $1, a_1, \ldots, a_L, b_1, \ldots, b_L$ are linearly independent over $\mathbb{Q}$, then there exist pairwise disjoint sets $Λ_\ell \subset \mathbb{Z}$, $\ell=1, \ldots, L$, such that for every $J \subset \{ 1, \ldots , L \}$, the system $\{e^{2πi λx} : λ\in \cup_{\ell \in J} \, Λ_\ell \}$ is a Riesz basis for $L^2 ( \cup_{\ell \in J} \, I_\ell)$. Also, we show that for any disjoint intervals $I_\ell$, $\ell=1, \ldots, L$, contained in $[1,N)$ with $N \in \mathbb{N}$, the orthonormal basis $\{e^{2πi n x} : n \in \mathbb{Z} \}$ of $L^2[0,1)$ can be complemented by a Riesz basis $\{e^{2πi λx} : λ\inΛ\}$ for $L^2(\cup_{\ell=1}^L \, I_{\ell})$ with some set $Λ\subset (\frac{1}{N} \mathbb{Z}) \backslash \mathbb{Z}$, in the sense that their union $\{e^{2πi λx} : λ\in \mathbb{Z} \cup Λ\}$ is a Riesz basis for $L^2 ( [0,1) \cup I_1 \cup \cdots \cup I_L )$.
A micromagnetic theory of skyrmion lifetime in ultrathin ferromagnetic films
Creators: name: Bernand-Mantel, Anne
name: Muratov, Cyrill B.
name: Slastikov, Valeriy V.
Publisher: name: arXiv
Year: 2021
Subjects: subject: Materials Science (cond-mat.mtrl-sci)
subject: Mesoscale and Nanoscale Physics (cond-mat.mes-hall)
subject: Pattern Formation and Solitons (nlin.PS)
subject: FOS: Physical sciences

description: We use the continuum micromagnetic framework to derive the formulas for compact skyrmion lifetime due to thermal noise in ultrathin ferromagnetic films with relatively weak interfacial Dzyaloshinskii-Moriya interaction. In the absence of a saddle point connecting the skyrmion solution to the ferromagnetic state, we interpret the skyrmion collapse event as ``capture by an absorber'' at microscale. This yields an explicit Arrhenius collapse rate with both the barrier height and the prefactor as functions of all the material parameters, as well as the dynamical paths to collapse.
description: 6 pages, 1 figure
Sonnenfleckenzeichnung Nr. 4555.
Zeichnung von Flecken und Fackelflächen zur Ermittlung der Sonnenaktivität am 23.04.1954, erstellt als Beobachtung im Projektionsverfahren Nr. 2633 von Karl Rapp in Locarno-Monti
Creators: name: [s.n.]
Publisher: name: [s.n.]
Year: 1954

description: Bleistiftzeichnung mit Tinte und Farbstift, erstellt für die Beobachtungen in Locarno-Monti auf dem Vordruck der Eidgenössischen Sternwarte Zürich. Instrument: Merz-Refraktor mit 13.5 cm Öffnung und 195 cm Brennweite, vereinzelt andere Instrumente wie Tel. 88x; Sonnenbild D = 25 cm. - Auf der Zeichnung wird zum Teil das Instrument vermerkt bzw. die Zählung der Beobachtungen im Projektionsverfahren fortgesetzt. Sporadisch sind Resultate mehrerer Aufnahmen pro Tag aufgelistet. Zuhanden der späteren statistischen Verarbeitung sind die Angaben für die Bestimmung der Fleckenrelativzahl notiert.
Zeichnung aus der Zeit der Beobachtertätigkeit von Ing. Karl Rapp als Privat-Astronom, die er seit den Neunzehnvierziger Jahren für die Eidgenössische Sternwarte Zürich ausführte. Aus den ersten zwei Jahren der freiwilligen Mitarbeit sind nur einzelne Stücke überliefert. Erst zwei Jahre später ist jeweils eine ergänzende Serie in Zürich aufbewahrt worden. Nochmals fünf Jahre später arbeitete Karl Rapp neu auf vertraglicher Basis weiter mit, bis schliesslich nach einem weiteren Jahrzehnt die permanente Beobachtungsstation in Locarno-Monti geschaffen wurde, welche an die langjährige Serie von Karl Rapp anknüpfte
Feasibility Study of Neural ODE and DAE Modules for Power System Dynamic Component Modeling
Creators: name: Xiao, Tannan
name: Chen, Ying
name: Huang, Shaowei
name: He, Tirui
name: Guan, Huizhe
Publisher: name: arXiv
Year: 2021
Subjects: subject: Systems and Control (eess.SY)
subject: Artificial Intelligence (cs.AI)
subject: FOS: Electrical engineering, electronic engineering, information engineering
subject: FOS: Computer and information sciences

description: In the context of high penetration of renewables, the need to build dynamic models of power system components based on accessible measurement data has become urgent. To address this challenge, firstly, a neural ordinary differential equations (ODE) module and a neural differential-algebraic equations (DAE) module are proposed to form a data-driven modeling framework that accurately captures components' dynamic characteristics and flexibly adapts to various interface settings. Secondly, analytical models and data-driven models learned by the neural ODE and DAE modules are integrated together and simulated simultaneously using unified transient stability simulation methods. Finally, the neural ODE and DAE modules are implemented with Python and made public on GitHub. Using the portal measurements, three simple but representative cases of excitation controller modeling, photovoltaic power plant modeling, and equivalent load modeling of a regional power network are carried out in the IEEE-39 system and 2383wp system. Neural dynamic model-integrated simulations are compared with the original model-based ones to verify the feasibility and potentiality of the proposed neural ODE and DAE modules.
description: 14 pages, 8 figures, 3 table. Under review by IEEE Transactions on Power Systems
Sonnenfleckenzeichnung Nr. 4482.
Zeichnung von Flecken und Fackelflächen zur Ermittlung der Sonnenaktivität am 15.01.1954, erstellt als Beobachtung im Projektionsverfahren Nr. 2564 von Karl Rapp in Locarno-Monti
Creators: name: [s.n.]
Publisher: name: [s.n.]
Year: 1954

description: Bleistiftzeichnung mit Tinte und Farbstift, erstellt für die Beobachtungen in Locarno-Monti auf dem Vordruck der Eidgenössischen Sternwarte Zürich. Instrument: Merz-Refraktor mit 13.5 cm Öffnung und 195 cm Brennweite, vereinzelt andere Instrumente wie Tel. 88x; Sonnenbild D = 25 cm. - Auf der Zeichnung wird zum Teil das Instrument vermerkt bzw. die Zählung der Beobachtungen im Projektionsverfahren fortgesetzt. Sporadisch sind Resultate mehrerer Aufnahmen pro Tag aufgelistet. Zuhanden der späteren statistischen Verarbeitung sind die Angaben für die Bestimmung der Fleckenrelativzahl notiert.
Zeichnung aus der Zeit der Beobachtertätigkeit von Ing. Karl Rapp als Privat-Astronom, die er seit den Neunzehnvierziger Jahren für die Eidgenössische Sternwarte Zürich ausführte. Aus den ersten zwei Jahren der freiwilligen Mitarbeit sind nur einzelne Stücke überliefert. Erst zwei Jahre später ist jeweils eine ergänzende Serie in Zürich aufbewahrt worden. Nochmals fünf Jahre später arbeitete Karl Rapp neu auf vertraglicher Basis weiter mit, bis schliesslich nach einem weiteren Jahrzehnt die permanente Beobachtungsstation in Locarno-Monti geschaffen wurde, welche an die langjährige Serie von Karl Rapp anknüpfte
Sonnenfleckenzeichnung Nr. 4495.
Zeichnung von Flecken und Fackelflächen zur Ermittlung der Sonnenaktivität am 01.02.1954, erstellt als Beobachtung im Projektionsverfahren Nr. 2575 von Karl Rapp in Locarno-Monti
Creators: name: [s.n.]
Publisher: name: [s.n.]
Year: 1954

description: Bleistiftzeichnung mit Tinte und Farbstift, erstellt für die Beobachtungen in Locarno-Monti auf dem Vordruck der Eidgenössischen Sternwarte Zürich. Instrument: Merz-Refraktor mit 13.5 cm Öffnung und 195 cm Brennweite, vereinzelt andere Instrumente wie Tel. 88x; Sonnenbild D = 25 cm. - Auf der Zeichnung wird zum Teil das Instrument vermerkt bzw. die Zählung der Beobachtungen im Projektionsverfahren fortgesetzt. Sporadisch sind Resultate mehrerer Aufnahmen pro Tag aufgelistet. Zuhanden der späteren statistischen Verarbeitung sind die Angaben für die Bestimmung der Fleckenrelativzahl notiert.
Zeichnung aus der Zeit der Beobachtertätigkeit von Ing. Karl Rapp als Privat-Astronom, die er seit den Neunzehnvierziger Jahren für die Eidgenössische Sternwarte Zürich ausführte. Aus den ersten zwei Jahren der freiwilligen Mitarbeit sind nur einzelne Stücke überliefert. Erst zwei Jahre später ist jeweils eine ergänzende Serie in Zürich aufbewahrt worden. Nochmals fünf Jahre später arbeitete Karl Rapp neu auf vertraglicher Basis weiter mit, bis schliesslich nach einem weiteren Jahrzehnt die permanente Beobachtungsstation in Locarno-Monti geschaffen wurde, welche an die langjährige Serie von Karl Rapp anknüpfte
Sonnenfleckenzeichnung Nr. 4481.
Zeichnung von Flecken und Fackelflächen zur Ermittlung der Sonnenaktivität am 14.01.1954, erstellt als Beobachtung im Projektionsverfahren Nr. 2563 von Karl Rapp in Locarno-Monti
Creators: name: [s.n.]
Publisher: name: [s.n.]
Year: 1954

description: Bleistiftzeichnung mit Tinte und Farbstift, erstellt für die Beobachtungen in Locarno-Monti auf dem Vordruck der Eidgenössischen Sternwarte Zürich. Instrument: Merz-Refraktor mit 13.5 cm Öffnung und 195 cm Brennweite, vereinzelt andere Instrumente wie Tel. 88x; Sonnenbild D = 25 cm. - Auf der Zeichnung wird zum Teil das Instrument vermerkt bzw. die Zählung der Beobachtungen im Projektionsverfahren fortgesetzt. Sporadisch sind Resultate mehrerer Aufnahmen pro Tag aufgelistet. Zuhanden der späteren statistischen Verarbeitung sind die Angaben für die Bestimmung der Fleckenrelativzahl notiert.
Zeichnung aus der Zeit der Beobachtertätigkeit von Ing. Karl Rapp als Privat-Astronom, die er seit den Neunzehnvierziger Jahren für die Eidgenössische Sternwarte Zürich ausführte. Aus den ersten zwei Jahren der freiwilligen Mitarbeit sind nur einzelne Stücke überliefert. Erst zwei Jahre später ist jeweils eine ergänzende Serie in Zürich aufbewahrt worden. Nochmals fünf Jahre später arbeitete Karl Rapp neu auf vertraglicher Basis weiter mit, bis schliesslich nach einem weiteren Jahrzehnt die permanente Beobachtungsstation in Locarno-Monti geschaffen wurde, welche an die langjährige Serie von Karl Rapp anknüpfte
Sonnenfleckenzeichnung Nr. 4526.
Zeichnung von Flecken und Fackelflächen zur Ermittlung der Sonnenaktivität am 15.03.1954, erstellt als Beobachtung im Projektionsverfahren Nr. 2604 von Karl Rapp in Locarno-Monti
Creators: name: [s.n.]
Publisher: name: [s.n.]
Year: 1954

description: Bleistiftzeichnung mit Tinte und Farbstift, erstellt für die Beobachtungen in Locarno-Monti auf dem Vordruck der Eidgenössischen Sternwarte Zürich. Instrument: Merz-Refraktor mit 13.5 cm Öffnung und 195 cm Brennweite, vereinzelt andere Instrumente wie Tel. 88x; Sonnenbild D = 25 cm. - Auf der Zeichnung wird zum Teil das Instrument vermerkt bzw. die Zählung der Beobachtungen im Projektionsverfahren fortgesetzt. Sporadisch sind Resultate mehrerer Aufnahmen pro Tag aufgelistet. Zuhanden der späteren statistischen Verarbeitung sind die Angaben für die Bestimmung der Fleckenrelativzahl notiert.
Zeichnung aus der Zeit der Beobachtertätigkeit von Ing. Karl Rapp als Privat-Astronom, die er seit den Neunzehnvierziger Jahren für die Eidgenössische Sternwarte Zürich ausführte. Aus den ersten zwei Jahren der freiwilligen Mitarbeit sind nur einzelne Stücke überliefert. Erst zwei Jahre später ist jeweils eine ergänzende Serie in Zürich aufbewahrt worden. Nochmals fünf Jahre später arbeitete Karl Rapp neu auf vertraglicher Basis weiter mit, bis schliesslich nach einem weiteren Jahrzehnt die permanente Beobachtungsstation in Locarno-Monti geschaffen wurde, welche an die langjährige Serie von Karl Rapp anknüpfte
title: On the Modularity of Decidability of Completeness and Termination
Creators: name: Salomaa, Kai
Publisher: name: Institut für Informatik, Justus-Liebig-Universität Giessen
Year: 1996

description: We consider decision problems for direct sums of term rewriting systems where the
components belong to classes for which the corresponding property is decidable. We
show that decidability of termination is not a modular property for finite left-linear
monadic term rewriting systems. It is known that termination is not modular [28].
Our result generalizes this nonmodularity result by establishing that for given two terminating
finite left-linear term rewriting systems we cannot even decide algorithmically
Whether or not their direct sum terminates Decidability of confluence and decidability
of completeness of (left- or right-) linear term rewriting systems are shown to be
modular. Decidability of completeness of general systems is shown to be nonmodular.
description: Journal of Automata, Languages and Combinatorics, Volume 1, Number 1, 1996, 37-53
title: Regulations of Uniformly k-Limited ET0L Systems and Their Relations to Controlled Context-Free Grammars
Creators: name: Wätjen, Dietmar
Publisher: name: Institut für Informatik, Justus-Liebig-Universität Giessen
Year: 1996

description: In this paper we consider different regulation mechanisms imposed upon uniformly
$k$-limited ET0L systems. We investigate matrix, periodically time varying, graphcontrolled,
programmed and regularly controlled systems on the one side and random
context and random context with appearance checking systems on the other side, as
well as mixtures of these two types. For $k = 1$, we compare these systems with regulated
context-free grammars as considered in the literature before. We establish equivalences
between different such systems and grammars.
description: Journal of Automata, Languages and Combinatorics, Volume 1, Number 1, 1996, 55-74
COCOPLOT: COlor COllapsed PLOTting software : Using color to view 3D data as a 2D image
Creators: name: Druett, Malcolm K.
name: Pietrow, Alexander G. M.
name: Vissers, Gregal J. M.
name: Robustini, Carolina
name: Calvo, Flavio
Publisher: name: arXiv
Year: 2021
Subjects: subject: Instrumentation and Methods for Astrophysics (astro-ph.IM)
subject: Solar and Stellar Astrophysics (astro-ph.SR)
subject: Data Analysis, Statistics and Probability (physics.data-an)
subject: FOS: Physical sciences

description: Most modern solar observatories deliver data products formatted as 3D spatio-temporal data cubes, that contain additional, higher dimensions with spectral and/or polarimetric information. This multi-dimensional complexity presents a major challenge when browsing for features of interest in several dimensions simultaneously. We developed the COlor COllapsed PLOTting (COCOPLOT) software as a quick-look and context image software, to convey spectral profile or time evolution from all the spatial pixels ($x,y$) in a 3D [$n_x,n_y,n_λ$] or [$n_x,n_y,n_t$] data cube as a single image, using color. This can avoid the need to scan through many wavelengths, creating difference and composite images when searching for signals satisfying multiple criteria. Filters are generated for the red, green, and blue channels by selecting values of interest to highlight in each channel, and their weightings. These filters are combined with the data cube over the third dimension axis to produce an $n_x \times n_y \times 3$ cube displayed as one true color image. Some use cases are presented for data from the Swedish 1-m Solar Telescope (SST) and IRIS, including H$α$ solar flare data, a comparison with $k$-means clustering for identifying asymmetries in the Ca II K line and off-limb coronal rain in IRIS C II slit-jaw images. These illustrate identification by color alone using COCOPLOT of locations including line wing or central enhancement, broadening, wing absorption, and sites with intermittent flows or time-persistent features. COCOPLOT is publicly available in both IDL and Python.
description: Published in RASTI
title: Colonies as Systems of Turing Machines Without States
Creators: name: Baník, Igor
Publisher: name: Institut für Informatik, Justus-Liebig-Universität Giessen
Year: 1996

description: The paper aims to propose a system of recognizing machines as a counterpart of colonies
of grammars. After presenting two unsuccessful approaches, the author proposes systems
of Turing machines without states as an adequate model. The class $L_{SW}$
languages recognized by single Turing machines without states, as well as the class
recognized by systems of such machines, is investigated. It is shown that the class $L_{SW}$
does not fit into the Chomsky hierarchy. Systems of Turing machines without states
are proved to have the same generative power as conventional Turing machines.
description: Journal of Automata, Languages and Combinatorics, Volume 1, Number 2, 1996, 81-96
Sonnenfleckenzeichnung Nr. 4568.
Zeichnung von Flecken und Fackelflächen zur Ermittlung der Sonnenaktivität am 09.05.1954, erstellt von Karl Rapp in Lugano
Creators: name: [s.n.]
Publisher: name: [s.n.]
Year: 1954

description: Bleistiftzeichnung mit Tinte und Farbstift, erstellt für die Beobachtungen in Lugano auf dem Vordruck der Eidgenössischen Sternwarte Zürich. Instrument: Merz-Refraktor mit 13.5 cm Öffnung und 195 cm Brennweite, vereinzelt andere Instrumente wie Tel. 88x; Sonnenbild D = 25 cm. - Auf der Zeichnung wird zum Teil das Instrument vermerkt bzw. die Zählung der Beobachtungen im Projektionsverfahren fortgesetzt. Sporadisch sind Resultate mehrerer Aufnahmen pro Tag aufgelistet. Zuhanden der späteren statistischen Verarbeitung sind die Angaben für die Bestimmung der Fleckenrelativzahl notiert.
Zeichnung aus der Zeit der Beobachtertätigkeit von Ing. Karl Rapp als Privat-Astronom, die er seit den Neunzehnvierziger Jahren für die Eidgenössische Sternwarte Zürich ausführte. Aus den ersten zwei Jahren der freiwilligen Mitarbeit sind nur einzelne Stücke überliefert. Erst zwei Jahre später ist jeweils eine ergänzende Serie in Zürich aufbewahrt worden. Nochmals fünf Jahre später arbeitete Karl Rapp neu auf vertraglicher Basis weiter mit, bis schliesslich nach einem weiteren Jahrzehnt die permanente Beobachtungsstation in Locarno-Monti geschaffen wurde, welche an die langjährige Serie von Karl Rapp anknüpfte
title: Accepting Grammars and Systems via Context Condition Grammars
Creators: name: Bordihn, Henning
name: Fernau, Henning
Publisher: name: Institut für Informatik, Justus-Liebig-Universität Giessen
Year: 1996

description: We investigate several kinds of regulated rewriting (matrix, ordered, programmed, and
variants thereof) and of parallel rewriting mechanisms (Lindenmayer systems, uniformly
limited Lindenmayer systems, limited Lindenmayer systems and scattered
context grammars) as accepting devices, in contrast with the usual generating mode.
In a lot of cases, accepting mode turns out to be exactly as powerful as generating
mode. These equivalences can be proved using a theorem on so-called context condition
grammars. Interestingly, accepting devices are (strictly) more powerful than their generating
counterparts in case of non-erasing ordered, programmed, and matrix grammars
with appearance checking (even programmed grammars with unconditional transfer),
and 1lEPT0L systems, where we arrive at new characterizations of the context-sensitive
languages. If we admit erasing productions, we get new characterizations of the recursively
enumerable languages.
Moreover, we supplement some hierarchies presented in [7], [10], and [31].
description: Journal of Automata, Languages and Combinatorics, Volume 1, Number 2, 1996, 97-112
title: Cantor Sets And Dejean's Conjecture
Creators: name: Currie, James D.
name: Shelton, Robert O.
Publisher: name: Institut für Informatik, Justus-Liebig-Universität Giessen
Year: 1996

description: Let $k\in\mathbb{R}$ be given, $1 \lt k \lt 2$. It is shown that for a large enough alphabet $\Sigma$, the set
of $\omega$-words over $\Sigma$ avoiding powers greater than $k$ is a Cantor set. In particular, a new
method for showing the existence of $\omega$-words over $\Sigma$ avoiding powers greater than $k$ is
given. This presents a new way in which to attack Dejean's conjecture. We also give
a new non-constructive proof that words of length at least $2^n$ over an $n$ letter alphabet
are avoidable.
description: Journal of Automata, Languages and Combinatorics, Volume 1, Number 2, 1996, 113-127
Invariant volume forms and first integrals for geodesically equivalent Finsler metrics
Creators: name: Bucataru, Ioan
Publisher: name: arXiv
Year: 2021
Subjects: subject: Differential Geometry (math.DG)
subject: Mathematical Physics (math-ph)
subject: FOS: Mathematics
subject: FOS: Physical sciences
subject: 53C60, 53B40, 53D25, 53A20

description: Two geodesically (projectively) equivalent Finsler metrics determine a set of invariant volume forms on the projective sphere bundle. Their proportionality factors are geodesically invariant functions and hence they are first integrals. Being 0-homogeneous functions, the first integrals are common for the entire projective class. In Theorem 1.1 we provide a practical and easy way of computing these first integrals as the coefficients of a characteristic polynomial.
Passalus plicatus Percheron 1835
Creators: name: Fonseca, Cláudio Ruy Vasconcelos Da
name: Reyes-Castillo, Pedro
Publisher: name: Zenodo
Year: 2004
Subjects: Biodiversity
Taxonomy
Animalia
Arthropoda
Insecta
Coleoptera
Passallidae
Passalus
Passalus plicatus

description: plicatus Percheron 1835 ­54
Minas Gerais
fracticornis Kuwert 1898 ­200
forma “a” Luederwaldt 1931b­164
forma “b” Luederwaldt 1931b­164
Rio de Janeiro
São Paulo
Santa Catarina
Rio Grande do Sul
description: Published as part of Fonseca, Cláudio Ruy Vasconcelos Da & Reyes-Castillo, Pedro, 2004, Synopsis on Passalidae family (Coleoptera: Scarabaeoidea) of Brazil with description of a new species of Veturius Kaup, 1871, pp. 1-26 in Zootaxa 789 (1) on pages 18-19, DOI: 10.11646/zootaxa.789.1.1, http://zenodo.org/record/5028960
Non-perturbative analytical diagonalization of Hamiltonians with application to coupling suppression and enhancement in cQED
Creators: name: Li, Boxi
name: Calarco, Tommaso
name: Motzoi, Felix
Publisher: name: arXiv
Year: 2021
Subjects: subject: Quantum Physics (quant-ph)
subject: FOS: Physical sciences

description: Deriving effective Hamiltonian models plays an essential role in quantum theory, with particular emphasis in recent years on control and engineering problems. In this work, we present two symbolic methods for computing effective Hamiltonian models: the Non-perturbative Analytical Diagonalization (NPAD) and the Recursive Schrieffer-Wolff Transformation (RSWT). NPAD makes use of the Jacobi iteration and works without the assumptions of perturbation theory while retaining convergence, allowing to treat a very wide range of models. In the perturbation regime, it reduces to RSWT, which takes advantage of an in-built recursive structure where remarkably the number of terms increases only linearly with perturbation order, exponentially decreasing the number of terms compared to the ubiquitous Schrieffer-Wolff method. In this regime, NPAD further gives an exponential reduction in terms, i.e. superexponential compared to Schrieffer-Wolff, relevant to high precision expansions. Both methods consist of algebraic expressions and can be easily automated for symbolic computation. To demonstrate the application of the methods, we study the ZZ and cross-resonance interactions of superconducting qubits systems. We investigate both suppressing and engineering the coupling in near-resonant and quasi-dispersive regimes. With the proposed methods, the coupling strength in the effective Hamiltonians can be estimated with high precision comparable to numerical results.
description: 19 pages, 8 figures, with more examples for NPAD including cross-resonance
title: Implementation of Parallel Replacement Systems for Cellular Hypergraphs
Creators: name: Hartmann, Peter
Publisher: name: Institut für Informatik, Justus-Liebig-Universität Giessen
Year: 1996

description: This paper gives an overview about the concept of cellular hypergraphs and parallel
replacement systems for these graphs. A versatile addressing model is presented which
can be used to perform computations on state values associated with a graph. The
same addressing model is the key to an efficient subgraph matching algorithm. This
algorithm demonstrates that the presented concept can be applied to real world problems.
Cellular hypergraphs with replacement systems are a generalization of the cellular
automata (CA) paradigm which constitutes an inherently massive-parallel model
of computation. The usage of a set of productions instead of a CA's local transition
function allows us not only to formulate state transitions, but furthermore temporal
modifications of the cellular structure itself. Consequently the concept can be used as
an abstract model of computation for those applications which are based on irregular
and dynamically changing meshes, i.e. the simulation of biological systems, dynamic
sceneries in computer graphics and adaptive mesh generation algorithms.
description: Journal of Automata, Languages and Combinatorics, Volume 1, Number 2, 1996, 129-146
Sonnenfleckenzeichnung Nr. 4524.
Zeichnung von Flecken und Fackelflächen zur Ermittlung der Sonnenaktivität am 12.03.1954, erstellt als Beobachtung im Projektionsverfahren Nr. 2602 von Karl Rapp in Locarno-Monti
Creators: name: [s.n.]
Publisher: name: [s.n.]
Year: 1954

description: Bleistiftzeichnung mit Tinte und Farbstift, erstellt für die Beobachtungen in Locarno-Monti auf dem Vordruck der Eidgenössischen Sternwarte Zürich. Instrument: Merz-Refraktor mit 13.5 cm Öffnung und 195 cm Brennweite, vereinzelt andere Instrumente wie Tel. 88x; Sonnenbild D = 25 cm. - Auf der Zeichnung wird zum Teil das Instrument vermerkt bzw. die Zählung der Beobachtungen im Projektionsverfahren fortgesetzt. Sporadisch sind Resultate mehrerer Aufnahmen pro Tag aufgelistet. Zuhanden der späteren statistischen Verarbeitung sind die Angaben für die Bestimmung der Fleckenrelativzahl notiert.
Zeichnung aus der Zeit der Beobachtertätigkeit von Ing. Karl Rapp als Privat-Astronom, die er seit den Neunzehnvierziger Jahren für die Eidgenössische Sternwarte Zürich ausführte. Aus den ersten zwei Jahren der freiwilligen Mitarbeit sind nur einzelne Stücke überliefert. Erst zwei Jahre später ist jeweils eine ergänzende Serie in Zürich aufbewahrt worden. Nochmals fünf Jahre später arbeitete Karl Rapp neu auf vertraglicher Basis weiter mit, bis schliesslich nach einem weiteren Jahrzehnt die permanente Beobachtungsstation in Locarno-Monti geschaffen wurde, welche an die langjährige Serie von Karl Rapp anknüpfte
Sonnenfleckenzeichnung Nr. 4471.
Zeichnung von Flecken und Fackelflächen zur Ermittlung der Sonnenaktivität am 01.01.1954, erstellt als Beobachtung im Projektionsverfahren Nr. 2554 von Karl Rapp in Locarno-Monti
Creators: name: [s.n.]
Publisher: name: [s.n.]
Year: 1954

description: Bleistiftzeichnung mit Tinte und Farbstift, erstellt für die Beobachtungen in Locarno-Monti auf dem Vordruck der Eidgenössischen Sternwarte Zürich. Instrument: Merz-Refraktor mit 13.5 cm Öffnung und 195 cm Brennweite, vereinzelt andere Instrumente wie Tel. 88x; Sonnenbild D = 25 cm. - Auf der Zeichnung wird zum Teil das Instrument vermerkt bzw. die Zählung der Beobachtungen im Projektionsverfahren fortgesetzt. Sporadisch sind Resultate mehrerer Aufnahmen pro Tag aufgelistet. Zuhanden der späteren statistischen Verarbeitung sind die Angaben für die Bestimmung der Fleckenrelativzahl notiert.
Zeichnung aus der Zeit der Beobachtertätigkeit von Ing. Karl Rapp als Privat-Astronom, die er seit den Neunzehnvierziger Jahren für die Eidgenössische Sternwarte Zürich ausführte. Aus den ersten zwei Jahren der freiwilligen Mitarbeit sind nur einzelne Stücke überliefert. Erst zwei Jahre später ist jeweils eine ergänzende Serie in Zürich aufbewahrt worden. Nochmals fünf Jahre später arbeitete Karl Rapp neu auf vertraglicher Basis weiter mit, bis schliesslich nach einem weiteren Jahrzehnt die permanente Beobachtungsstation in Locarno-Monti geschaffen wurde, welche an die langjährige Serie von Karl Rapp anknüpfte
One-generated nilpotent bicommutative algebras
Creators: name: Kaygorodov, Ivan
name: Páez-Guillán, Pilar
name: Voronin, Vasily
Publisher: name: arXiv
Year: 2021
Subjects: subject: Rings and Algebras (math.RA)
subject: FOS: Mathematics

description: We give a classification of $5$- and $6$-dimensional complex one-generated nilpotent bicommutative algebras.
description: arXiv admin note: text overlap with arXiv:2004.03598, arXiv:1903.08997
Against identification of contextuality with violation of the Bell inequalities: lessons from theory of randomness
Creators: name: Khrennikov, Andrei
Publisher: name: arXiv
Year: 2021
Subjects: subject: Quantum Physics (quant-ph)
subject: Probability (math.PR)
subject: FOS: Physical sciences
subject: FOS: Mathematics

description: Nowadays contextuality is the hotest topic of quantum foundations and, especially, foundations of quantum information theory. This notion is characterized by the huge diversity of approaches and interpretations. One of the strongest trends in contextual research is to identify contextuality with violation of the Bell inequalities. We call this sort of contextuality {\it Bell test contextuality} (BTC). In this note, we criticize the BTC-approach. It can be compared with an attempt to identify the complex and theoretically nontrivial notion of randomness with a test for randomness (or a batch of tests, as the NIST-test). We advertize {\it Bohr contextuality} -- taking into account all experimental conditions (context). In the simplest case, the measurement context of an observable $A$ is reduced to joint measurement with a compatible observable $B.$ The latter definition was originally considered by Bell in relation to his inequality. We call it {\it joint measurement contextuality} (JMC). Although JMC is based on the use of counterfactuals, by considering it in the general Bohr's framework it is possible to handle JMC on physical grounds. We suggest (similarly to randomness) to certify JMC in experimental data with Bell tests, but only certify and not reduce.
description: To be published in J. Russian Laser Research
title: Undecidability Results for Shuffle Languages
Creators: name: Jędrzejowicz, Joanna
Publisher: name: Institut für Informatik, Justus-Liebig-Universität Giessen
Year: 1996

description: We consider shuffle languages which are an extension of regular languages with two
operators, that is shuffle (sometimes called interleaving) and shuffle closure. The class
of shuffle languages is a proper subset of context-sensitive languages, incomparable with
context-free ones. For this class we give two undecidability results. First of all we show
that the intersection emptiness problem for shuffle languages is undecidable and then
we prove that there is no algorithm to determine the shuffle closure height of shuffle
expressions.
description: Journal of Automata, Languages and Combinatorics, Volume 1, Number 2, 1996, 147-159
Pandax-4T limits on $Z^\prime$ mass in 3-3-1LHN model
Creators: name: Oliveira, Vinícius
name: Pires, C. A. de S.
Publisher: name: arXiv
Year: 2021
Subjects: subject: High Energy Physics - Phenomenology (hep-ph)
subject: High Energy Astrophysical Phenomena (astro-ph.HE)
subject: FOS: Physical sciences

description: The framework of the so-called 3-3-1LHN model may accommodate two different, but viable, scenarios of dark matter: one involving a heavy Dirac neutrino , $N_1$, or another having a scalar, $ϕ$, as dark matter candidate. In both cases the dark matter phenomenology, relic abundance and scattering cross section off of nuclei, is controlled by exchange of $Z^{\prime}$. We then investigate the impact on the parameter space $(M_{Z^{\prime}}\,,\,M_{(N_1\,,\, ϕ)})$ due to the recent Pandax-4T experimental result in both scenarios. First, the Pandax-4T experiment excludes scenarios with dark matter mass below $1.9$ TeV. Concerning $Z^{\prime}$, we find the lower bound $M_{Z^{\prime}}> 4.1$ TeV for the case when $N_1$ as the dark matter and $ M_{Z^{\prime}}>5.7$ TeV for the other case. This implies that the 3-3-1 symmetry is spontaneously broken above $10$ TeV scale. We also comment on the contributions to the relic abundance of processes involving flavor changing neutral current mediated by $Z^{\prime}$.
description: 15 pages, 8 figures, Matches version accepted in Phys. Rev. D
Referencing software source code artifacts: identifiers for digital object
Creators: name: Granger, Sabrina
name: Nordling, Josefine
Publisher: name: Zenodo
Year: 2024
Subjects: PIDs

description: Software identification refers to multiple  practices depending if you focus more on describing (i.e. attributing credit to authors) or on referencing software. PIDs used to reference data sets, such as DOIs, are useful to reference a software as a project (i.e. the software as a concept, not a digital object). But referencing software artifacts (i.e. digital objects) with different levels of granularity calls for specific identifiers. Therefore identifiers in Software Heritage allow to reference a specific version of the source code of a project, at different levels of granularity: a snapshot, a release, a directory, down to a single file. SWHID are unique identifiers intrinsically bound to the software components. The difference between extrinsic and intrinsic identifiers lies in the way the relation between identifier and designated object is created and maintained. SWHID don’t rely on an external register. Thus, end-users can recompute identifiers on retrieved objects and verify the match.
title: Convex Algebras, Convex Modules and Formal Power Series on Trees
Creators: name: Bozapalidis, Symeon
Publisher: name: Institut für Informatik, Justus-Liebig-Universität Giessen
Year: 1996

description: We obtain behaviors of stochastic treeautomata by means of convex algebras. The
following minimal realization result is established: for each convexly reachable algebra
$A$, there exists a unique convex epimorphism $A \to \CSynt(S_A)$, where $\CSynt(S_A)$
denotes the syntactical convex algebra associated with the treeseries $S_A$ computed by
$A$. Treeseries whose syntactical convex algebra is convexly finite, are studied. Finally,
the following conditions are shown to be equivalent: i) $S : T_\Sigma\to [0, 1]$ is computed
by a convexly finite $\Sigma$-module, ii) all right derivatives of $S$ are included into the same
convexly finite sub-$\Sigma$-module of $[0,1]^{T_\Sigma}$, iii) there exist a function $\psi : \Sigma_0\to [0, 1]^n$,
a monoid morphism $\phi : P_\Sigma\to \Stoch_{n\times n}$ compatible with $\phi$ and a vector $\gamma\in \Stoch_n$,
so that $(S,t)=\psi(c)\phi(\tau)\gamma$ for $t=c\tau$ where $\Stoch_{n\times n}$ and $\Stoch_n$ denote the monoid
of stochastic $n\times n$ matrices and stochastic $n$-vectors, respectively.
description: Journal of Automata, Languages and Combinatorics, Volume 1, Number 3, 1996, 165-180
Sonnenfleckenzeichnung Nr. 4517.
Zeichnung von Flecken und Fackelflächen zur Ermittlung der Sonnenaktivität am 05.03.1954, erstellt als Beobachtung im Projektionsverfahren Nr. 2595 von Karl Rapp in Locarno-Monti
Creators: name: [s.n.]
Publisher: name: [s.n.]
Year: 1954

description: Bleistiftzeichnung mit Tinte und Farbstift, erstellt für die Beobachtungen in Locarno-Monti auf dem Vordruck der Eidgenössischen Sternwarte Zürich. Instrument: Merz-Refraktor mit 13.5 cm Öffnung und 195 cm Brennweite, vereinzelt andere Instrumente wie Tel. 88x; Sonnenbild D = 25 cm. - Auf der Zeichnung wird zum Teil das Instrument vermerkt bzw. die Zählung der Beobachtungen im Projektionsverfahren fortgesetzt. Sporadisch sind Resultate mehrerer Aufnahmen pro Tag aufgelistet. Zuhanden der späteren statistischen Verarbeitung sind die Angaben für die Bestimmung der Fleckenrelativzahl notiert.
Zeichnung aus der Zeit der Beobachtertätigkeit von Ing. Karl Rapp als Privat-Astronom, die er seit den Neunzehnvierziger Jahren für die Eidgenössische Sternwarte Zürich ausführte. Aus den ersten zwei Jahren der freiwilligen Mitarbeit sind nur einzelne Stücke überliefert. Erst zwei Jahre später ist jeweils eine ergänzende Serie in Zürich aufbewahrt worden. Nochmals fünf Jahre später arbeitete Karl Rapp neu auf vertraglicher Basis weiter mit, bis schliesslich nach einem weiteren Jahrzehnt die permanente Beobachtungsstation in Locarno-Monti geschaffen wurde, welche an die langjährige Serie von Karl Rapp anknüpfte
Probing non-thermal light DM with structure formation and $N_\mathrm{eff}$
Creators: name: Baumholzer, Sven
name: Schwaller, Pedro
Publisher: name: arXiv
Year: 2021
Subjects: subject: High Energy Physics - Phenomenology (hep-ph)
subject: Cosmology and Nongalactic Astrophysics (astro-ph.CO)
subject: FOS: Physical sciences

description: In many models of dark matter (DM), several production mechanisms contribute to its final abundance, often leading to a non-thermal momentum distribution. This makes it more difficult to assess whether such a model is consistent with structure formation observations. We simulate the matter power spectrum for DM scenarios characterized by at least two temperatures and derive the suppression of structures at small scales and the expected number of Milky Way dwarf galaxies from it. This, together with the known bound on the number of relativistic particle species, $N_\mathrm{eff}$, allows us to obtain constraints on the parameter space of non-thermally produced DM. We propose a simple parametrization for non-thermal DM distributions and present a fitting procedure that can be used to adapt our results to other models.
description: 34 pages, 14 figures. Code to extract results available on request v2: Matched with published version
title: Maximal Solid Codes
Creators: name: Jürgensen, Helmut
name: Katsura, Masashi
name: Konstantinidis, Stavros
Publisher: name: Institut für Informatik, Justus-Liebig-Universität Giessen
Year: 2001

description: In the hierarchy of classes of codes, the solid codes lie below the class of comma-free
codes. They have a remarkable resistance to noise in information transmission: Every
correctly transmitted code word can also be decoded correctly and without delay. The
results of this paper concern maximal solid codes of variable length. First, it is shown
that almost every finite non-maximal solid code can be embedded in an infinite maximal
one. Second, all the maximal solid codes of a certain type are characterized. Finally, the
relation of the maximal solid codes of that type to the Chomsky hierarchy is discussed.
description: Journal of Automata, Languages and Combinatorics, Volume 6, Number 1, 2001, 25-50
title: On the Power of Subroutines for Finite State Machines
Creators: name: Nebel, Markus E.
Publisher: name: Institut für Informatik, Justus-Liebig-Universität Giessen
Year: 2001

description: In this paper we extend the finite state machines by a subroutine concept. Two implementations
are considered. The first implementation yields a new class of languages
which is a subclass of the context-free languages. The second one leads to an alternative
automata-model for the context-free languages. Besides the generative capacity
other properties like determinism, reversal languages, etc. are also studied. We prove
that determinism for the second implementation is equivalent to the notion of $LL(1)$-languages.
The motivation for those observations comes from a description language for
plot data called DPF which is used in practice and which possesses simple non-regular
constructions only.
description: Journal of Automata, Languages and Combinatorics, Volume 6, Number 1, 2001, 51-74
Passalus sicatus Burmeister 1847
Creators: name: Fonseca, Cláudio Ruy Vasconcelos Da
name: Reyes-Castillo, Pedro
Publisher: name: Zenodo
Year: 2004
Subjects: Biodiversity
Taxonomy
Animalia
Arthropoda
Insecta
Coleoptera
Passallidae
Passalus
Passalus sicatus

description: sicatus Burmeister 1847 ­489
São Paulo
Santa Catarina
Rio Grande do Sul
description: Published as part of Fonseca, Cláudio Ruy Vasconcelos Da & Reyes-Castillo, Pedro, 2004, Synopsis on Passalidae family (Coleoptera: Scarabaeoidea) of Brazil with description of a new species of Veturius Kaup, 1871, pp. 1-26 in Zootaxa 789 (1) on page 19, DOI: 10.11646/zootaxa.789.1.1, http://zenodo.org/record/5028960
title: P Systems with Active Membranes: Attacking NP-Complete Problems
Creators: name: Păun, Gheorghe
Publisher: name: Institut für Informatik, Justus-Liebig-Universität Giessen
Year: 2001

description: P systems are parallel Molecular Computing models based on processing multisets of
objects in cell-like membrane structures. Various variants were already shown to be
computationally universal, equal in power to Turing machines. In this paper one proposes
a class of P systems whose membranes are the main active components, in the
sense that they directly mediate the evolution and the communication of objects. Moreover,
the membranes can multiply themselves by division. We prove that this variant
is not only computationally universal, but also able to solve NP-complete problems in
polynomial (actually, linear) time. We exemplify this assertion with the well-known
SAT problem.
description: Journal of Automata, Languages and Combinatorics, Volume 6, Number 1, 2001, 75-90
The Terrestrial Planet Formation around M Dwarfs: In-situ, Inward Migration or Reversed Migration
Creators: name: Pan, Mengrui
name: Wang, Su
name: Ji, Jianghui
Publisher: name: arXiv
Year: 2021
Subjects: subject: Earth and Planetary Astrophysics (astro-ph.EP)
subject: Solar and Stellar Astrophysics (astro-ph.SR)
subject: FOS: Physical sciences

description: Terrestrial planets are commonly observed to orbit M dwarfs with close-in trajectories. In this work, we extensively perform N-body simulations of planetesimal accretion with three models of in-situ, inward migration and reversed migration to explore terrestrial formation in tightly compact systems of M dwarfs. In the simulations, the solid disks are assumed to be 0.01\% of the masses of host stars and spread from 0.01 to 0.5 AU with the surface density profile scaling with $r^{-k}$ according to the observations. Our results show that in-situ scenario may produce $7.77^{+3.23}_{-3.77}$ terrestrial planets with an average mass of $1.23^{+4.01}_{-0.93} \ M_{\oplus}$ around M dwarfs. The number of planets tends to increase as the disk slope is steeper or with a larger stellar mass. Moreover, we show that $2.55^{+1.45}_{-1.55}$ planets with mass of $3.76^{+8.77}_{-3.46} \ M_{\oplus}$ are formed in the systems via inward migration, while $2.85^{+1.15}_{-0.85}$ planets with $3.01^{+13.77}_{-2.71} \ M_{\oplus}$ are yielded under reversed migration. Migration scenarios can also deliver plentiful water from the exterior of ice line to the interior due to more efficient accretion. The simulation outcomes of reversed migration model produce the best matching with observations, being suggestive of a likely mechanism for planetary formation around M dwarfs.
description: 13 pages, 9 figures, accepted for publication in MNRAS