cometadata/datacite-rtg-text-other-reclassification-records huggingface dataset:
Stacking and gate tunable topological flat bands, gaps and anisotropic strip patterns in twisted trilayer graphene
Creators: name: Shin, Jiseon
name: Chittari, Bheema Lingam
name: Jung, Jeil
Publisher: name: arXiv
Year: 2021
Subjects: subject: Mesoscale and Nanoscale Physics (cond-mat.mes-hall)
subject: FOS: Physical sciences

description: Trilayer graphene with a twisted middle layer has recently emerged as a new platform exhibiting correlated phases and superconductivity near its magic angle. A detailed characterization of its electronic structure in the parameter space of twist angle $θ$, interlayer potential difference $Δ$, and top-bottom layer stacking $τ$ reveals that flat bands with large Coulomb energy vs bandwidth $U/W > 1$ are expected within a range of $\pm 0.2^{\circ}$ near $θ\simeq1.5^{\circ}$ and $θ\simeq1.2^{\circ}$ for $τ_{\rm AA}$ top-bottom layer stacking, between a wider $1^{\circ} \sim 1.7^{\circ}$ range for $τ_{\rm AB}$ stacking, whose bands often have finite valley Chern numbers thanks to the opening of primary and secondary band gaps in the presence of a finite $Δ$, and below $θ\lesssim 0.6^{\circ}$ for all $τ$ considered. The largest $U/W$ ratios are expected at the magic angle $\sim 1.5^{\circ}$ when $|Δ| \sim 0$~meV for AA, and slightly below near $\sim 1.4^{\circ}$ for finite $|Δ| \sim 25$~meV for AB stackings, and near $θ\sim 0.4^{\circ}$ for both stackings. When $τ$ is the saddle point stacking vector between AB and BA we observe pronounced anisotropic local density of states (LDOS) strip patterns with broken triangular rotational symmetry. We present optical conductivity calculations that reflect the changes in the electronic structure introduced by the stacking and gate tunable system parameters.
description: 13 pages 8 figures
The PUNCH4NFDI consortium with the "Nationale Forschungsdateninfrastruktur" (NFDI)
Creators: name: Haungs, Andreas
name: Schörner-Sadenius, Thomas
Publisher: name: Zenodo
Year: 2021
Subjects: Research date Management

description: With the ''Nationale Forschungsdateninfrastruktur'' (NFDI, national research data infrastructure), a massive effort is undertaken in Germany to provide a coherent research data management and make research data useable according to the FAIR data principles. PUNCH4NFDI is the consortium of particle, astro- and astroparticle, and hadron&nuclear physics within the NFDI. It aims for a FAIR future of the data management of its community and at harnessing its massive experience particularly in ''big data'' and ''open data'' for the benefit of ''PUNCH'' sciences (Particles, Universe, NuClei and Hadrons) as well as for the entire NFDI. In this presentation at the annual meeting of the DPG 2021 in Dortmund, we addressedeng the needs for FAIR and open data management and the plans of the PUNCH4NFDI consortium to address this needs.
A diffuse tidal dwarf galaxy destined to fade out as a "dark galaxy"
Creators: name: Román, Javier
name: Jones, Michael G.
name: Montes, Mireia
name: Verdes-Montenegro, Lourdes
name: Garrido, Julián
name: Sánchez, Susana
Publisher: name: arXiv
Year: 2021
Subjects: subject: Astrophysics of Galaxies (astro-ph.GA)
subject: FOS: Physical sciences

description: We have explored the properties of a peculiar object detected in deep optical imaging and located at the tip of an HI tail emerging from Hickson Compact Group 16. Using multiband photometry from infrared to ultraviolet, we were able to constrain its stellar age to 58$^{+22}_{-9}$ Myr with a rather high metallicity of [Fe/H] = $-$0.16$^{+0.43}_{-0.41}$ for its stellar mass of M$_\star$ = 4.2$\times$10$^6$ M$_\odot$, a typical signature of tidal dwarf galaxies. The structural properties of this object are similar to those of diffuse galaxies, with a round and featureless morphology, a large effective radius (r$_{eff}$ = 1.5 kpc), and a low surface brightness ($_{eff}$ = 25.6 mag arcsec$^{-2}$). Assuming that the object is dynamically stable and able to survive in the future, its fading in time via the aging of its stellar component will make it undetectable in optical observations in just $\sim$2 Gyr of evolution, even in the deepest current or future optical surveys. Its high HI mass, M(HI) = 3.9$\times$10$^8$ M$_\odot$, and future undetectable stellar component will make the object match the observational properties of dark galaxies, that is, dark matter halos that failed to turn gas into stars. Our work presents further observational evidence of the feasibility of HI tidal features becoming fake dark galaxies; it also shows the impact of stellar fading, particularly in high metallicity systems such as tidal dwarfs, in hiding aged stellar components beyond detection limits in optical observations.
description: Accepted for publication in A&A Letters
Table SM4 from Isochrony in Titi Monkeys duets: social context as a proximate cause of duets’ rhythm and regularity
Creators: name: De Gregorio, Chiara
name: Antonini, Paola
name: Heymann, Eckhard W.
name: Gamba, Marco
Publisher: name: The Royal Society
Year: 2025
Subjects: classificationCode: 310901
subject: Animal behaviour

description: Model result on tk duration
Remote Reactor Ranging via Antineutrino Oscillations
Creators: name: Wilson, Steve T.
name: Cotsford, Chris
name: Armitage, James
name: Holland, Niamh
name: Malek, Matthew
name: Learned, John. G.
Publisher: name: arXiv
Year: 2023
Subjects: subject: Instrumentation and Detectors (physics.ins-det)
subject: High Energy Physics - Experiment (hep-ex)
subject: FOS: Physical sciences

description: Antineutrinos from nuclear reactors have the potential to be used for reactor monitoring in the mid- to far-field under certain conditions. Antineutrinos are an unshieldable signal and carry information about the reactor core and the distance they travel. Using gadolinium-doped water Cherenkov detectors for this purpose has been previously proposed alongside rate-only analyses. As antineutrinos carry information about their distance of travel in their energy spectrum, the analyses can be extended to a spectral analysis to gain more knowledge about the detected core. Two complementary analyses are used to evaluate the distance between a proposed gadolinium-doped water-based liquid scintillator detector and a detected nuclear reactor. Example cases are shown for a detector in Boulby Mine, near the Boulby Underground Laboratory in the UK, and six reactor sites in the UK and France. The analyses both show strong potential to range reactors, but are limited by the detector design.
description: 13 pages, 12 figures, 5 tables
Transport of Molecular Motor Dimers in Burnt-Bridge Models
Creators: name: Morozov, Alexander Yu.
name: Kolomeisky, Anatoly B.
Publisher: name: arXiv
Year: 2007
Subjects: subject: Statistical Mechanics (cond-mat.stat-mech)
subject: Soft Condensed Matter (cond-mat.soft)
subject: FOS: Physical sciences

description: Dynamics of molecular motor dimers, consisting of rigidly bound particles that move along two parallel lattices and interact with underlying molecular tracks, is investigated theoretically by analyzing discrete-state stochastic continuous-time burnt-bridge models. In these models the motion of molecular motors is viewed as a random walk along the lattices with periodically distributed weak links (bridges). When the particle crosses the weak link it can be destroyed with a probability $p$, driving the molecular motor motion in one direction. Dynamic properties and effective generated forces of dimer molecular motors are calculated exactly as a function of a concentration of bridges $c$ and burning probability $p$ and compared with properties of the monomer motors. It is found that the ratio of the velocities of the dimer and the monomer can never exceed 2, while the dispersions of the dimer and the monomer are not very different. The relative effective generated force of the dimer (as compared to the monomer) also cannot be larger than 2 for most sets of parameters. However, a very large force can be produced by the dimer in the special case of $c=1/2$ for non-zero shift between the lattices. Our calculations do not show the significant increase in the force generated by collagenase motor proteins in real biological systems as predicted by previous computational studies. The observed behavior of dimer molecular motors is discussed by considering in detail the particle dynamics near burnt bridges.
description: 21 pages and 11 figures
Chersotis elegans
Creators: name: Koren, Toni
name: Podnar, Martina
name: Vojvoda, Ana Mrnjavčić
name: Beshkov, Stoyan
name: Mihoci, Iva
name: Kučinić, Mladen
Publisher: name: Zenodo
Year: 2021
Subjects: Biodiversity
Taxonomy
Animalia
Arthropoda
Insecta
Lepidoptera
Noctuidae
Chersotis
Chersotis elegans

description: Chersotis elegans (Eversmann, 1837)
New records: Mt. Biokovo, mountain hut above Sv. Jure peak, 30.7.2018, 1 ex., leg Koren; Mt. Biokovo, Ravna Vlaška, 07.08.2007, 1 ex., leg. Mihoci.
Genetic data: no specimen of Ch. elegans existed in the BOLD database. In order to confirm the correct identification of the specimens from Mt. Biokovo, male genitalia were checked in accordance to Fibiger (1997). During this research we barcoded one specimen from Croatia and one from Albania. Two COI haplotypes (p-distance = 0.5%) were obtained within three analyzed specimens of Ch. elegans. Those sequences form a well-supported clade and represent the first published Ch. elegans DNA barcodes. For its closest species, Ch. anatolica, analyzed samples from Albania have identical COI haplotypes and clustered within well supported monophyletic Ch. anatolica clade together with Italian (PHLAB1175-10) and North Macedonian (PHLAF399-11) samples of the same species. It should be noted that even though these two species have great morphological similarity, they are not sister species (Dufay & Varga, 1995). The overall intraspecific distance in this species is low and ranged between 0.2 and 0.3 % (Tab. 2). Both female and male genitalia, including everted vesicas are however quite different (Fig. 3. a-e), the difference are much bigger than between Ch. fimbriola and Ch. laeta and between the subspecies of Ch. laeta.
description: Published as part of Koren, Toni, Podnar, Martina, Vojvoda, Ana Mrnjavčić, Beshkov, Stoyan, Mihoci, Iva & Kučinić, Mladen, 2021, Genus Chersotis Boisduval, 1840 (Lepidoptera: Noctuidae) in Croatia with some notes on the other Balkan countries: DNA barcoding, distribution and new records, pp. 86-108 in Ecologica Montenegrina 48 on page 91, DOI: 10.37828/em.2021.48.12, http://zenodo.org/record/8029303
Klemens Bruski, Ziemie nad dolną Wierzycą od XIII do początku XV wieku
Creators: name: Hartmann, Stefan
Publisher: name: Zeitschrift für Ostmitteleuropa-Forschung
Year: 1998

description: Zeitschrift für Ostmitteleuropa-Forschung, Bd. 47 Nr. 1 (1998)
Andrzej Jezierski, Cecylia Leszczyńska, Dzieje gospodarcze Polski w zarysie do 1989 r
Creators: name: Strobel, Georg W.
Publisher: name: Zeitschrift für Ostmitteleuropa-Forschung
Year: 1997

description: Zeitschrift für Ostmitteleuropa-Forschung, Bd. 46 Nr. 1 (1997)
PRОFЕSSIОNАL TА'LIM MUАSSАSАLАRI RАHBАRLАRI UCHUN IMMЕRSIV О'QUV DАSTURINI ISHLАB CHIQISH VА UNI АMАLIYОTGА JОRIY ЕTISHNING АHАMIYАTI
Creators: name: О'rmоnоv, Еlmurоd
Publisher: name: Zenodo
Year: 2025

description: Kаsbiy tа'limning rivоjlаnаyоtgаn mаnzаrаsi yеtаkchilik kаdrlаrini tаyyоrlаshgа innоvаtsiоn yоndаshuvlаrni tаlаb qilаdi. Virtuаl hаqiqаt (VR), kеngаytirilgаn hаqiqаt (АR) vа аrаlаsh hаqiqаt (MR) ni о‘z ichigа оlgаn immеrsiv о‘quv dаsturlаri yеtаkchilik mаlаkаsini оshiruvchi dinаmik vа tаjribаviy о‘quv muhitini tаklif еtаdi. Ushbu mаqоlа kаsbiy tа'lim muаssаsаlаri rаhbаrlаri uchun immеrsiv о'quv dаsturini ishlаb chiqish vа jоriy еtishning аhаmiyаtini о'rgаnаdi. Undа qаrоrlаr qаbul qilishni tаkоmillаshtirish, muаmmоlаrni yеchish vа fаоllikni оshirish kаbi аsоsiy аfzаlliklаr muhоkаmа qilinаdi, shu bilаn birgа muаmmоlаr vа ilg‘оr аmаliyоtlаr kо‘rib chiqilаdi. Immеrsiv tа'lim tеxnоlоgiyаlаrini intеgrаtsiyаlаshgаn hоldа, tа'lim rаhbаrlаri murаkkаb muаmmоlаrni yаxshirоq hаl qilishlаri vа institutsiоnаl о'sish vа о'zgаrishlаrni rаg'bаtlаntirishlаri mumkin.
The Non-Equilibrium Reliability of Quantum Memories
Creators: name: Kay, Alastair
Publisher: name: arXiv
Year: 2008
Subjects: subject: Quantum Physics (quant-ph)
subject: FOS: Physical sciences

description: The ability to store quantum information without recourse to constant feedback processes would yield a significant advantage for future implementations of quantum information processing. In this paper, limitations of the prototypical model, the Toric code in two dimensions, are elucidated along with a sufficient condition for overcoming these limitations. Specifically, the interplay between Hamiltonian perturbations and dynamically occurring noise is considered as a system in its ground state is brought into contact with a thermal reservoir. This proves that when utilizing the Toric code on N^2 qubits in a 2D lattice as a quantum memory, the information cannot be stored for a time O(N). In contrast, the 2D Ising model protects classical information against the described noise model for exponentially long times. The results also have implications for the robustness of braiding operations in topological quantum computation.
description: 4 pages. v3: published version
LTM: Scalable and Black-box Similarity-based Test Suite Minimization based on Language Models
Creators: name: Pan, Rongqi
name: Ghaleb, Taher A.
name: Briand, Lionel
Publisher: name: arXiv
Year: 2023
Subjects: subject: Software Engineering (cs.SE)
subject: FOS: Computer and information sciences

description: Test suites tend to grow when software evolves, making it often infeasible to execute all test cases with the allocated testing budgets, especially for large software systems. Test suite minimization (TSM) is employed to improve the efficiency of software testing by removing redundant test cases, thus reducing testing time and resources, while maintaining the fault detection capability of the test suite. Most existing TSM approaches rely on code coverage (white-box) or model-based features, which are not always available to test engineers. Recent TSM approaches that rely only on test code (black-box) have been proposed, such as ATM and FAST-R. To address the scalability, we propose LTM (Language model-based Test suite Minimization), a novel, scalable, and black-box similarity-based TSM approach based on large language models (LLMs), which is the first application of LLMs in the context of TSM. To support similarity measurement for test code embeddings, we investigate five pre-trained language models: CodeBERT, GraphCodeBERT, UniXcoder, StarEncoder, and CodeLlama, on which we compute two similarity measures: Cosine Similarity and Euclidean Distance. Our goal is to find similarity measures that are not only computationally more efficient but can also better guide a Genetic Algorithm (GA) to search for optimal minimized test suites, thus reducing the overall search time. Experimental results show that the best configuration of LTM (UniXcoder/Cosine) outperforms ATM in three aspects: (a) achieving a slightly greater saving rate of testing time (41.72% versus 41.02%, on average); (b) attaining a significantly higher fault detection rate (0.84 versus 0.81, on average); and, most importantly, (c) minimizing test suites nearly five times faster on average, with higher gains for larger test suites and systems, thus achieving much higher scalability.
Comparing two approaches to the K-theory classification of D-branes
Creators: name: Ruffino, Fabio Ferrari
name: Savelli, Raffaele
Publisher: name: arXiv
Year: 2008
Subjects: subject: High Energy Physics - Theory (hep-th)
subject: Mathematical Physics (math-ph)
subject: K-Theory and Homology (math.KT)
subject: FOS: Physical sciences
subject: FOS: Mathematics

description: We consider the two main classification methods of D-brane charges via K-theory, in type II superstring theory with vanishing B-field: the Gysin map approach and the one based on the Atiyah-Hirzebruch spectral sequence. Then, we find out an explicit link between these two approaches: the Gysin map provides a representative element of the equivalence class obtained via the spectral sequence. We also briefly discuss the case of rational coefficients, characterized by a complete equivalence between the two classification methods.
description: 34 pages, no figures
Wiktor Szymaniak, Organizacja dyplomacji Prus Książęcych na dworze Zygmunta Starego 1525-1548
Creators: name: Hartmann, Stefan
Publisher: name: Zeitschrift für Ostmitteleuropa-Forschung
Year: 1995

description: Zeitschrift für Ostmitteleuropa-Forschung, Bd. 44 Nr. 2 (1995)
Performance of Reservoir Discretizations in Quantum Transport Simulations
Creators: name: Elenewski, Justin E.
name: Wójtowicz, Gabriela
name: Rams, Marek M.
name: Zwolak, Michael
Publisher: name: arXiv
Year: 2021
Subjects: subject: Mesoscale and Nanoscale Physics (cond-mat.mes-hall)
subject: Strongly Correlated Electrons (cond-mat.str-el)
subject: FOS: Physical sciences

description: Quantum transport simulations often use explicit, yet finite, electronic reservoirs. These should converge to the correct continuum limit, albeit with a trade-off between discretization and computational cost. Here, we study this interplay for extended reservoir simulations, where relaxation maintains a bias or temperature drop across the system. Our analysis begins in the non-interacting limit, where we parameterize different discretizations to compare them on an even footing. For many-body systems, we develop a method to estimate the relaxation that best approximates the continuum by controlling virtual transitions in Kramers' turnover for the current. While some discretizations are more efficient for calculating currents, there is little benefit with regard to the overall state of the system. Any gains become marginal for many-body, tensor network simulations, where the relative performance of discretizations varies when sweeping other numerical controls. These results indicate that a given reservoir discretization may have little impact on numerical efficiency for certain computational tools. The choice of a relaxation parameter, however, is crucial, and the method we develop provides a reliable estimate of the optimal relaxation for finite reservoirs.
description: Manuscript + SI
Resolving local and global kinematic signatures of satellite mergers with billion particle simulations
Creators: name: Hunt, Jason A. S.
name: Stelea, Ioana A.
name: Johnston, Kathryn V.
name: Gandhi, Suroor S.
name: Laporte, Chervin F. P.
name: Bedorf, Jeroen
Publisher: name: arXiv
Year: 2021
Subjects: subject: Astrophysics of Galaxies (astro-ph.GA)
subject: FOS: Physical sciences

description: In this work we present two new $\sim10^9$ particle self-consistent simulations of the merger of a Sagittarius-like dwarf galaxy with a Milky Way-like disc galaxy. One model is a violent merger creating a thick disc, and a Gaia-Enceladus/Sausage like remnant. The other is a highly stable disc which we use to illustrate how the improved phase space resolution allows us to better examine the formation and evolution of structures that have been observed in small, local volumes in the Milky Way, such as the $z-v_z$ phase spiral and clustering in the $v_{\mathrm{R}}-v_ϕ$ plane when compared to previous works. The local $z-v_z$ phase spirals are clearly linked to the global asymmetry across the disc: we find both 2-armed and 1-armed phase spirals, which are related to breathing and bending behaviors respectively. Hercules-like moving groups are common, clustered in $v_{\mathrm{R}}-v_ϕ$ in local data samples in the simulation. These groups migrate outwards from the inner galaxy, matching observed metallicity trends even in the absence of a galactic bar. We currently release the best fitting `present day' merger snapshots along with the unperturbed galaxies for comparison.
description: 16 pages, 14 figures, accepted by MNRAS
Electroencephalogram Signal Processing with Independent Component Analysis and Cognitive Stress Classification using Convolutional Neural Networks
Creators: name: Sutharsan, Venkatakrishnan
name: Swaminathan, Alagappan
name: Ramachandran, Saisrinivasan
name: Lakshmanan, Madan Kumar
name: Mahadevan, Balaji
Publisher: name: arXiv
Year: 2021
Subjects: subject: Signal Processing (eess.SP)
subject: Artificial Intelligence (cs.AI)
subject: Machine Learning (cs.LG)
subject: Neural and Evolutionary Computing (cs.NE)
subject: FOS: Electrical engineering, electronic engineering, information engineering
subject: FOS: Computer and information sciences

description: Electroencephalogram (EEG) is the recording which is the result due to the activity of bio-electrical signals that is acquired from electrodes placed on the scalp. In Electroencephalogram signal(EEG) recordings, the signals obtained are contaminated predominantly by the Electrooculogram(EOG) signal. Since this artifact has higher magnitude compared to EEG signals, these noise signals have to be removed in order to have a better understanding regarding the functioning of a human brain for applications such as medical diagnosis. This paper proposes an idea of using Independent Component Analysis(ICA) along with cross-correlation to de-noise EEG signal. This is done by selecting the component based on the cross-correlation coefficient with a threshold value and reducing its effect instead of zeroing it out completely, thus reducing the information loss. The results of the recorded data show that this algorithm can eliminate the EOG signal artifact with little loss in EEG data. The denoising is verified by an increase in SNR value and the decrease in cross-correlation coefficient value. The denoised signals are used to train an Artificial Neural Network(ANN) which would examine the features of the input EEG signal and predict the stress levels of the individual.
description: 16 pages, 10 figures, 2 tables, 8 equations, 16 references
Axiomatic Foundations for the Principle of Entropy Increase
Creators: name: Zhang, Qi-Ren
Publisher: name: arXiv
Year: 2007
Subjects: subject: Classical Physics (physics.class-ph)
subject: FOS: Physical sciences

description: We show that the principle of entropy increase may be exactly founded on a few axioms valid not only for quantum and classical statistics, but also for a wide range of statistical processes.
description: 8 pages
A metallicity study of F, G, K and M dwarfs in the Coma Berenices open cluster from the APOGEE survey
Creators: name: Souto, Diogo
name: Cunha, Katia
name: Smith, Verne
Publisher: name: arXiv
Year: 2021
Subjects: subject: Solar and Stellar Astrophysics (astro-ph.SR)
subject: Astrophysics of Galaxies (astro-ph.GA)
subject: FOS: Physical sciences

description: We present a study of metallicities in a sample of main sequence stars with spectral types M, K, G and F ($T_{\rm eff}$ $\sim$ 3200 -- 6500K and log $g$ $\sim$ 4.3 -- 5.0 dex) belonging to the solar neighborhood young open cluster Coma Berenices. Metallicities were determined using the high-resolution (R=$λ$/$Δ$ $λ$ $\sim$ 22,500) NIR spectra ($λ$1.51 -- $λ$1.69 $μ$m) of the SDSS-IV APOGEE survey. Membership to the cluster was confirmed using previous studies in the literature along with APOGEE radial velocities and Gaia DR2. An LTE analysis using plane-parallel MARCS model atmospheres and the APOGEE DR16 line list was adopted to compute synthetic spectra and derive atmospheric parameters ($T_{\rm eff}$ and log $g$) for the M dwarfs and metallicities for the sample. The derived metallicities are near solar and are homogeneous at the level of the expected uncertainties, in particular when considering stars from a given stellar class. The mean metallicity computed for the sample of G, K, and M dwarfs is $\langle$[Fe/H]$\rangle$ = +0.04 $\pm$ 0.02 dex; however, the metallicities of the F-type stars are slightly lower, by about 0.04 dex, when compared to cooler and less massive members. Models of atomic diffusion can explain this modest abundance dip for the F dwarfs, indicating that atomic diffusion operates in Coma Berenices stars. The [Fe/H] dip occurs in nearly the same effective temperature range as that found in previous analyses of the lithium and beryllium abundances in Coma Berenices.
description: Accepted to ApJ
Paul Peikert, "Festung Breslau" in den Berichten eines Pfarrers. 22. Januar bis 6. Mai 1945
Creators: name: Abmeier, Hans-Ludwig
Publisher: name: Zeitschrift für Ostmitteleuropa-Forschung
Year: 1997

description: Zeitschrift für Ostmitteleuropa-Forschung, Bd. 46 Nr. 1 (1997)
Topological spin Hall effect in antiferromagnets driven by vector Néel chirality
Creators: name: Nakazawa, Kazuki
name: Hoshi, Koujiro
name: Nakane, Jotaro J.
name: Ohe, Jun-ichiro
name: Kohno, Hiroshi
Publisher: name: arXiv
Year: 2023
Subjects: subject: Mesoscale and Nanoscale Physics (cond-mat.mes-hall)
subject: FOS: Physical sciences

description: Spin Hall effect of spin-texture origin is explored theoretically for antiferromagnetic (AF) metals. It is found that a vector chirality formed by the Néel vector gives rise to a topological spin Hall effect. This is topological since it is proportional to the winding number counted by in-plane vector chirality along the sample edge, which can be nonvanishing for AF merons but not for AF skyrmions. The effect is enhanced when the Fermi level lies near the AF gap, and, surprisingly, at weak coupling with small AF gap. These features are confirmed numerically based on the Landauer-Büttiker formula. Important roles played by nonadiabatic processes and spin dephasing are pointed out.
description: 16 pages, 11 figures
Light Like Segment Compactification and Braneworlds with Dynamical String Tension
Creators: name: Guendelman, Eduardo
Publisher: name: arXiv
Year: 2021
Subjects: subject: High Energy Physics - Theory (hep-th)
subject: FOS: Physical sciences

description: Braneworld scenarios appear in dynamical string tension theories, where string tension is positive between two surfaces separated by a short distance and at the two surfaces themselves the string tensions become infinite, therefore producing an effective confinement of the strings and therefore of all matter and gravity to the space between these to surfaces. The specific model studied is in the context of the modified measure formulation the string where tension appear as an additional dynamical degree of freedom and these tensions are not universal, but rather each string generates its own tension, which can have a different value for each string. We consider a new background field that can couple to these strings, the tension scalar is capable then of changing locally along the world sheet and then the value of the tension of the string object changes accordingly along the world sheet. Sting tension appears dynamically and each string tension has a characteristic constant of integration that appears as a consequence of the dynamical tension generation . When many types of strings probing the same region of space are considered this tension scalar is constrained by the requirement of quantum conformal invariance. For the case of two types of strings probing the same region of space with different dynamically generated tensions (characterized by different constants of integration) , there are two different metrics, associated to the different strings, that have to satisfy vacuum Einsteins equations and the consistency of these two Einsteins equations determine that the tension field behaves. The two metrics are flat space in Minkowshi space and flat space after a special conformal transformation, then the strings are confined inside a light like Segment or alternatively as expanding Braneworlds where the strings are confined between two expanding bubbles.
description: 17 pages. References added. This version has been accepted for publication in European Physics Journal C. arXiv admin note: substantial text overlap with arXiv:2105.02279, arXiv:2104.08875
Star Formation at Very Low Metallicity. IV. Fragmentation Does Not Depend on Metallicity for Cold Initial Conditions
Creators: name: Jappsen, Anne-Katharina
name: Klessen, Ralf S.
name: Glover, Simon C. O.
name: Mac Low, Mordecai-Mark
Publisher: name: arXiv
Year: 2007
Subjects: subject: Astrophysics (astro-ph)
subject: FOS: Physical sciences

description: Primordial star formation appears to result in stars at least an order of magnitude more massive than modern star formation. It has been proposed that the transition from primordial to modern initial mass functions occurs due to the onset of effective metal line cooling at a metallicity Z/Z_sun = 10^{-3.5}. However, these simulations neglected molecular hydrogen cooling. We perform simulations using the same initial conditions, but including molecular cooling, using a complex network that follows molecular hydrogen formation and also directly follows carbon monoxide and water. We find that molecular hydrogen cooling allows roughly equivalent fragmentation to proceed even at zero metallicity for these initial conditions. The apparent transition just represents the point where metal line cooling becomes more important than molecular cooling. In all cases, the fragments are massive enough to be consistent with models of primordial stellar masses, suggesting that the transition to the modern initial mass function may be determined by other physics such as dust formation. We conclude that such additional cooling mechanisms, combined with the exact initial conditions produced by cosmological collapse are likely more important than metal line cooling in determining the initial mass function, and thus that there is unlikely to be a sharp transition in the initial mass function at Z/Z_sun = 10^{-3.5}.
description: 41 pages, 4 figures, 3 tables, accepted for publication in ApJ
Deformed solutions of the Yang-Baxter equation associated to dual weak braces
Creators: name: Mazzotta, Marzia
name: Rybołowicz, Bernard
name: Stefanelli, Paola
Publisher: name: arXiv
Year: 2023
Subjects: subject: Quantum Algebra (math.QA)
subject: Rings and Algebras (math.RA)
subject: FOS: Mathematics
subject: 16T25, 81R50, 20M18, 16Y99

description: A dual weak brace is an algebraic structure $\left(S,\,+,\,\circ\right)$ including skew braces and giving rise to a set-theoretic solution of the Yang-Baxter equation. We show that such a map belongs to a family of set-theoretic solutions, called deformed solutions, that are defined on $S$ and depending on certain parameters. We prove these elements are exactly those belonging to the distributor of $S$, i.e., $\mathcal{D}_r(S)=\{z \in S \, \mid \, \forall \, a,b \in S \quad (a+b) \circ z=a\circ z-z+b \circ z\}$, that is a full inverse subsemigroup of $\left(S, \circ\right)$. Regarding $S$ as a strong semilattice $[Y, B_α, ϕ_{α,β}]$ of skew braces $B_α$, we analyze when $\mathcal{D}_r(S)=\mathop{\dot{\bigcup}}\limits_{α\in Y} \mathcal{D}_r(B_α)$ and in which cases a deformed solution is the strong semilattices of deformed solutions.
description: In press
Bożena Domagała, Mniejszość niemiecka na Warmii i Mazurach. Rodowód kulturowy, organizacja, tożsamość
Creators: name: Mrowka, Heinrich
Publisher: name: Zeitschrift für Ostmitteleuropa-Forschung
Year: 1998

description: Zeitschrift für Ostmitteleuropa-Forschung, Bd. 47 Nr. 2 (1998)
Brachyrhynchus madagascariensis Hoberlandt 1957
Creators: name: Heiss, Ernst
Publisher: name: Zenodo
Year: 2012
Subjects: Biodiversity
Taxonomy
Animalia
Arthropoda
Insecta
Hemiptera
Aradidae
Brachyrhynchus
Brachyrhynchus madagascariensis

description: Brachyrhynchus madagascariensis (Hoberlandt), 1957
Mezira madagascariensis Hoberlandt, 1957: 66. HT 3: Madagscar (Rogez); NMPC. Mezira patruelis Kiritshenko, 1959: 181 (synonymized by Hoberlandt, 1963: 165). HT 3: Madagascar (Périnet [=Andasibe])
Brachyrhynchus madagascariensis Kormilev & Froeschner, 1987: 117
Distr.: Madagascar; (Vohemar, Ampasimena,Baie d’Antagonil, Fort Dauphin [=Taolanaro], Bezanozano, Maevatanana, Tsiroanomandidy, Ankavandra, Forêt d’ Isaka: Hoberlandt, 1957) Ref.: Kiritshenko, 1959 (fig.); Hoberlandt, 1957 (key,fig.,distr.); Kormilev & Froeschner, 1987: 117 (cat.)
description: Published as part of Heiss, Ernst, 2012, Annotated catalogue of the flat bug family Aradidae Brullé, 1836 of Madagascar and adjacent islands (Hemiptera: Heteroptera), pp. 45-63 in Zootaxa 3426 (1) on page 51, DOI: 10.11646/zootaxa.3426.1.3, http://zenodo.org/record/214110
Teoria, pratica e storia: problemi metodologici degli studi teatrali
Creators: name: De Marinis, Marco
Publisher: name: Annali Online  Lettere - Ferrara
Year: 2012

description: A discussion of methodological problems in theatrical studies,  concerning especially the relations between theory, history and  practice.
description: Annali Online  Lettere - Ferrara, II 1 (2007)
An examination of alternate financing for co-operative housing
Creators: name: Pomeroy, Steve
Publisher: name: University of British Columbia
Year: 2010

description: The past decade has seen the emergence of an increasing housing problem characterized by constraints on accessibility to homeownership and a rental sector frustrated by prohibitively high development costs. In addressing this problem this thesis proposes that co-operative tenure be pursued as an affordable alternative to the traditional forms of ownership or rental tenure. The historical struggle for legitimation of co-operative tenure in government housing policy has more recently resurfaced with the Federal Government threatening to curtail funding to the Co-operative Housing Program. This thesis contends that the future of the co-operative housing movement in Canada lies in the extrication of the movement from its current dependence of substantial government subsidies. It is proposed that this objective be pursued through innovative financing methods. Data from a recently developed co-operative project have been utilized in base case simulations with various financing techniques. Both Price Level Adjusted Mortgages and bond financing were found to be effective in overcoming the prohibitively high housing charges necessitated for a multi-family co-operative housing development to be economically viable without government assistance through direct grants or loans, or indirect tax benefits. The nature of these two financing techniques would however still require government support in the form of loan guarantees, bond issue, and legislative amendments. This thesis concludes with the proposition that through the adoption of innovative financing the co-operative sector could move toward a position of greater independence. Concurrently, government could utilize indexed mortgage financing to increase cost effectiveness and targetting of existing social housing programs.
Proposed realization of itinerant ferromagnetism in optical lattices
Creators: name: Zhang, Shizhong
name: Hung, Hsiang-hsuan
name: Wu, Congjun
Publisher: name: arXiv
Year: 2008
Subjects: subject: Strongly Correlated Electrons (cond-mat.str-el)
subject: Materials Science (cond-mat.mtrl-sci)
subject: FOS: Physical sciences

description: We propose to realize the itinerant ferromagnetism of two-component cold fermionic atoms in the $p$-orbital bands in optical lattices. The band flatness in the two-dimensional honeycomb lattice dramatically amplifies the interaction effect driving the ferromagnetic transition even with a relatively weak repulsive interaction. This scheme has the advantage that the stability of the system can be maintained without suffering decaying to the molecular state as one approaches the Feshbach resonance from the side with positive scattering length. Experimental signatures and detections are also discussed.
description: accepted by Physical Review A
Multireference Algebraic Diagrammatic Construction Theory for Excited States: Extended Second-Order Implementation and Benchmark
Creators: name: Mazin, Ilia M.
name: Sokolov, Alexander Yu.
Publisher: name: arXiv
Year: 2021
Subjects: subject: Chemical Physics (physics.chem-ph)
subject: FOS: Physical sciences

description: We present an implementation and benchmark of new approximations in multireference algebraic diagrammatic construction theory for simulations of neutral electronic excitations and UV/Vis spectra of strongly correlated molecular systems (MR-ADC). Following our work on the first-order MR-ADC approximation [J. Chem. Phys. 2018, 149, 204113], we report the strict and extended second-order MR-ADC methods (MR-ADC(2) and MR-ADC(2)-X) that combine the description of static and dynamic electron correlation in the ground and excited electronic states without relying on state-averaged reference wavefunctions. We present an extensive benchmark of the new MR-ADC methods for excited states in several small molecules, including the carbon dimer, ethylene, and butadiene. Our results demonstrate that for weakly-correlated electronic states the MR-ADC(2) and MR-ADC(2)-X methods outperform the third-order single-reference ADC approximation and are competitive with the results from equation-of-motion coupled cluster theory. For states with multireference character, the performance of the MR-ADC methods is similar to that of an N-electron valence perturbation theory. In contrast to conventional multireference perturbation theories, the MR-ADC methods have a number of attractive features, such as a straightforward and efficient calculation of excited-state properties and a direct access to excitations outside of the frontier (active) orbitals.
Wiktor Szymaniak, Rola Dworu Polskiego w polityce zagranicznej Prus Książęcych
Creators: name: Hartmann, Stefan
Publisher: name: Zeitschrift für Ostmitteleuropa-Forschung
Year: 1995

description: Zeitschrift für Ostmitteleuropa-Forschung, Bd. 44 Nr. 2 (1995)
Stepwise fabrication and optimization of coplanar waveguide resonator hybrid devices
Creators: name: Kellner, N.
name: Hüttner, N.
name: Will, M.
name: Hakonen, P.
name: Hüttel, A. K.
Publisher: name: arXiv
Year: 2023
Subjects: subject: Applied Physics (physics.app-ph)
subject: Mesoscale and Nanoscale Physics (cond-mat.mes-hall)
subject: Superconductivity (cond-mat.supr-con)
subject: FOS: Physical sciences

description: From the background of microwave-optomechanical experiments involving carbon nanotubes, the optimization of superconducting coplanar waveguide resonator devices is discussed. Two devices, one with unmodified geometry compared to previous work and one integrating several improvements, are lithographically built up step by step. After each step, the low temperature GHz transmission properties are retested. This allows to identify the impact of the fabrication and the geometry modification on the device properties. In addition, simplified circuit geometries are modeled numerically, confirming the experimental results and providing further insights for optimization.
description: 4 figure, 5 pages. Physica Status Solidi B (2023)
Dynamics of binary black holes in low-mass young star clusters
Creators: name: Rastello, Sara
name: Mapelli, Michela
name: di Carlo, Ugo N.
name: Iorio, Giuliano
name: Ballone, Alessandro
name: Giacobbo, Nicola
name: Santoliquido, Filippo
name: Torniamenti, Stefano
Publisher: name: arXiv
Year: 2021
Subjects: subject: Astrophysics of Galaxies (astro-ph.GA)
subject: High Energy Astrophysical Phenomena (astro-ph.HE)
subject: Solar and Stellar Astrophysics (astro-ph.SR)
subject: FOS: Physical sciences

description: Young star clusters are dynamically active stellar systems and are a common birthplace for massive stars. Low-mass star clusters ($\sim{}300-10^3$ M$_\odot$) are more numerous than massive systems and are characterized by a two-body relaxation time scale of a few Myr: the most massive stars sink to the cluster core and dynamically interact with each other even before they give birth to compact objects. Here, we explore the properties of black holes (BHs) and binary black holes (BBHs) formed in low-mass young star clusters, by means of a suite of $10^5$ direct $N$-body simulations with a high original binary fraction (100 % for stars with mass $>5$ M$_\odot$). Most BHs are ejected in the first $\sim{}20$ Myr by dynamical interactions. Dynamical exchanges are the main formation channel of BBHs, accounting for $\sim{}40-80$ % of all the systems. Most BBH mergers in low-mass young star clusters involve primary BHs with mass $<40$ M$_\odot$ and low mass ratios are extremely more common than in the field. Comparing our data with those of more massive star clusters ($10^3-3\times{}10^4$ M$_\odot$), we find a strong dependence of the percentage of exchanged BBHs on the mass of the host star cluster. In contrast, our results show just a mild correlation between the mass of the host star cluster and the efficiency of BBH mergers.
description: 14 pages, 13 figures, comments welcome
Danzig. Gdansk. Deutsch-Polnische Geschichte, Politik und Literatur
Creators: name: Jähnig, Bernhart
Publisher: name: Zeitschrift für Ostmitteleuropa-Forschung
Year: 1998

description: Zeitschrift für Ostmitteleuropa-Forschung, Bd. 47 Nr. 1 (1998)
Long-Term Fairness with Unknown Dynamics
Creators: name: Yin, Tongxin
name: Raab, Reilly
name: Liu, Mingyan
name: Liu, Yang
Publisher: name: arXiv
Year: 2023
Subjects: subject: Machine Learning (cs.LG)
subject: FOS: Computer and information sciences

description: While machine learning can myopically reinforce social inequalities, it may also be used to dynamically seek equitable outcomes. In this paper, we formalize long-term fairness in the context of online reinforcement learning. This formulation can accommodate dynamical control objectives, such as driving equity inherent in the state of a population, that cannot be incorporated into static formulations of fairness. We demonstrate that this framing allows an algorithm to adapt to unknown dynamics by sacrificing short-term incentives to drive a classifier-population system towards more desirable equilibria. For the proposed setting, we develop an algorithm that adapts recent work in online learning. We prove that this algorithm achieves simultaneous probabilistic bounds on cumulative loss and cumulative violations of fairness (as statistical regularities between demographic groups). We compare our proposed algorithm to the repeated retraining of myopic classifiers, as a baseline, and to a deep reinforcement learning algorithm that lacks safety guarantees. Our experiments model human populations according to evolutionary game theory and integrate real-world datasets.
description: Best paper runner-up at ICLR 2023 Workshop on Trustworthy and Reliable Large-Scale Machine Learning Models (Non Archival)
Algorithmic determination of a large integer in the two-term Machin-like formula for pi
Creators: name: Abrarov, Sanjar M.
name: Jagpal, Rajinder K.
name: Siddiqui, Rehan
name: Quine, Brendan M.
Publisher: name: arXiv
Year: 2021
Subjects: subject: General Mathematics (math.GM)
subject: FOS: Mathematics
subject: 11Y60

description: In our earlier publication we have shown how to compute by iteration a rational number ${u_{2,k}}$ in the two-term Machin-like formula for pi of kind $$\fracπ{4}=2^{k-1}\arctan\left(\frac{1}{u_{1,k}}\right)+\arctan\left(\frac{1}{u_{2,k}}\right),\qquad k\in \mathbb{Z},\quad k\ge 1,$$ where ${u_{1,k}}$ can be chosen as an integer ${u_{1,k}} = \left\lfloor{{a_k}/\sqrt{2-a_{k-1}}}\right\rfloor$ with nested radicals defined as ${a_k}=\sqrt{2+a_{k-1}}$ and $a_0 = 0$. In this work we report an alternative method for determination of the integer $u_{1,k}$. This approach is based on a simple iteration and does not require any irrational (surd) numbers from the set $\left\{a_k\right\}$ in computation of the integer $u_{1,k}$. Mathematica programs validating these results are presented.
description: 30 pages
Manifolds covered by lines and extremal rays
Creators: name: Novelli, Carla
name: Occhetta, Gianluca
Publisher: name: arXiv
Year: 2008
Subjects: subject: Algebraic Geometry (math.AG)
subject: FOS: Mathematics
subject: 14J40, 14E30, 14C99

description: Let $X$ be a smooth complex projective variety and let $H \in \pic(X)$ be an ample line bundle. Assume that $X$ is covered by rational curves with degree one with respect to $H$ and with anticanonical degree greater than or equal to $(\dim X -1)/2$. We prove that there is a covering family of such curves whose numerical class spans an extremal ray in the cone of curves $\cone(X)$.
description: Major revision, to appear in Canadian Mathematical Bulletin
Adam Sudoł, Polska na szachownicy wielkich mocarstw. Sprawa polska w tajnej korespondencji dyplomatycznej (1941 —1945)
Creators: name: Krzoska, Markus
Publisher: name: Zeitschrift für Ostmitteleuropa-Forschung
Year: 1998

description: Zeitschrift für Ostmitteleuropa-Forschung, Bd. 47 Nr. 2 (1998)
Experimental Estimates of Dephasing Time in Molecular Magnets
Creators: name: Keren, Amit
name: Shafir, Oren
name: Shimshoni, Efrat
name: Marvaud, Valerie
name: Bachschmidt, Anne
name: Long, Jerome
Publisher: name: arXiv
Year: 2007
Subjects: subject: Strongly Correlated Electrons (cond-mat.str-el)
subject: FOS: Physical sciences

description: Muon spin relaxation measurements in isotropic molecular magnets (MM) with a spin value S ranging from 7/2 to 27/2 are used to determine the magnitude and origin of dephasing time $τ_ϕ$ of molecular magnets. It is found that $τ_ϕ$ ~ 10 nsec with no S or ligand dependence. This indicates a nuclear origin for the stochastic field. Since $τ_ϕ$ is a property of the environment, we argue that it is a number common to similar types of MM. Therefore, $τ_ϕ$ is shorter than the Zener and tunneling times of anisotropic MM such as Fe8 or Mn4 for standard laboratory sweep rates. Our findings call for a stochastic Landau-Zener theory in this particular case.
description: 10 pages, 3 figures
Prompt TeV neutrinos from dissipative photospheres of gamma-ray bursts
Creators: name: Wang, Xiang-Yu
name: Dai, Zi-Gao
Publisher: name: arXiv
Year: 2008
Subjects: subject: Astrophysics (astro-ph)
subject: High Energy Physics - Phenomenology (hep-ph)
subject: FOS: Physical sciences

description: Recently, it was suggested that a photospheric component that results from the internal dissipation occurring in the optically thick inner parts of relativistic outflows may be present in the prompt $γ$/X-ray emission of gamma-ray bursts or X-ray flashes. We explore high-energy neutrino emission in this dissipative photosphere model, assuming that the composition of the outflow is baryon-dominated. We find that neutrino emission from proton-proton collision process forms an interesting signature in the neutrino spectra. Under favorable conditions for the shock dissipation site, these low-energy neutrinos could be detected by ${\rm km^3}$ detectors, such as Icecube. Higher energies ($\ga10$ TeV) neutrino emission from proton-proton collision and photo-pion production processes could be significantly suppressed for dissipation at relatively small radii, due to efficient Bethe-Heitler cooling of protons and/or radiative cooling of the secondary mesons in the photosphere radiation. As the dissipation shocks continue further out, high energy neutrinos from photo-pion production process becomes dominant.
description: Accepted by ApJ Letters, some changes made following the referees' comments, conclusions unchanged. The paper was originally submitted to PRL on June 6 (2008); resubmitted to ApJL on Oct.1 (2008); accepted by ApJL on Dec. 9 (2008)
Axel Sanjosé, Literatur der Reformationszeit in Ost- und Westpreußen
Creators: name: Kluge, Friedemann
Publisher: name: Zeitschrift für Ostmitteleuropa-Forschung
Year: 1995

description: Zeitschrift für Ostmitteleuropa-Forschung, Bd. 44 Nr. 2 (1995)