cometadata/datacite-rtg-text-other-reclassification-records huggingface dataset:
Open string multi-branched and Kahler potentials
Creators: name: Carta, Federico
name: Marchesano, Fernando
name: Staessens, Wieland
name: Zoccarato, Gianluca
Publisher: name: arXiv
Year: 2016
Subjects: subject: High Energy Physics - Theory (hep-th)
subject: FOS: Physical sciences

description: We consider type II string compactifications on Calabi-Yau orientifolds with fluxes and D-branes, and analyse the F-term scalar potential that simultaneously involves closed and open string modes. In type IIA models with D6-branes such potential can be directly computed by integrating out Minkowski three-forms. The result shows a multi-branched structure along the space of lifted open string moduli, in which discrete shifts in special Lagrangian and Wilson line deformations are compensated by changes in the RR flux quanta. The same sort of discrete shift symmetries are present in the superpotential and constrain the Kahler potential. As for the latter, inclusion of open string moduli breaks the factorisation between complex structure and Kahler moduli spaces. Nevertheless, the 4d Kahler metrics display a set of interesting relations that allow to rederive the scalar potential analytically. Similar results hold for type IIB flux compactifications with D7-brane Wilson lines.
description: 60 pages, one figure. v2 minor corrections and references added
นางหาบ: พุทธจริยศาสตร์จิตอาสา
Creators: name: บุญวัฒน์ บุญทะวงศ์
Publisher: name: สถาบันวิจัยและพัฒนา มหาวิทยาลัยราชภัฏเลย
Year: 2565
Subjects: พุทธจริยศาสตร์
นางหาบ
จิตอาสา

description: วารสารวิจัยและพัฒนา มหาวิทยาลัยราชภัฏเลย, 17, 61, 1
Spectrum-splitting approach for Fermi-operator expansion in all-electron Kohn-Sham DFT calculations
Creators: name: Motamarri, Phani
name: Gavini, Vikram
name: Bhattacharya, Kaushik
name: Ortiz, Michael
Publisher: name: arXiv
Year: 2016
Subjects: subject: Computational Physics (physics.comp-ph)
subject: FOS: Physical sciences

description: We present a spectrum-splitting approach to conduct all-electron Kohn-Sham density functional theory (DFT) calculations by employing Fermi-operator expansion of the Kohn-Sham Hamiltonian. The proposed approach splits the subspace containing the occupied eigenspace into a core-subspace, spanned by the core eigenfunctions, and its complement, the valence-subspace, and thereby enables an efficient computation of the Fermi-operator expansion by reducing the expansion to the valence-subspace projected Kohn-Sham Hamiltonian. The key ideas used in our approach are: (i) employ Chebyshev filtering to compute a subspace containing the occupied states followed by a localization procedure to generate non-orthogonal localized functions spanning the Chebyshev-filtered subspace; (ii) compute the Kohn-Sham Hamiltonian projected onto the valence-subspace; (iii) employ Fermi-operator expansion in terms of the valence-subspace projected Hamiltonian to compute the density matrix, electron-density and band energy. We demonstrate the accuracy and performance of the method on benchmark materials systems involving silicon nano-clusters up to 1330 electrons, a single gold atom and a six-atom gold nano-cluster. The benchmark studies on silicon nano-clusters revealed a staggering five-fold reduction in the Fermi-operator expansion polynomial degree by using the spectrum-splitting approach for accuracies in the ground-state energies of $\sim 10^{-4} Ha/atom$ with respect to reference calculations. Further, numerical investigations on gold suggest that spectrum splitting is indispensable to achieve meaningful accuracies, while employing Fermi-operator expansion.
description: 12 pages, 5 figures
Does longevity of a word determine its polysemy?
Creators: name: Koshevoy, Alexey
name: Morin, Olivier
name: Dautriche, Isabelle
Publisher: name: OSF Registries
Year: 2023
Subjects: subject: Linguistics
subject: FOS: Languages and literature
subject: Social and Behavioral Sciences
subject: Computational Linguistics
subject: Zipf's meaning-frequency correlation
subject: communicative efficiency
subject: language change
subject: longevity
subject: word frequency

description: In this project, we are testing whether the longevity of a word (how long it has existed in a lexicon) can reliably predict the number of additional meanings it has.
Dynamical analogue spacetimes in non-relativistic flows
Creators: name: Fernandes, Karan
name: Maity, Susovan
name: Das, Tapas K.
Publisher: name: arXiv
Year: 2021
Subjects: subject: General Relativity and Quantum Cosmology (gr-qc)
subject: High Energy Astrophysical Phenomena (astro-ph.HE)
subject: Fluid Dynamics (physics.flu-dyn)
subject: FOS: Physical sciences

description: Analogue gravity models describe linear fluctuations of fluids as a massless scalar field propagating on stationary acoustic spacetimes constructed from the background flow. In this paper, we establish that this paradigm generalizes to arbitrary order nonlinear perturbations propagating on dynamical analogue spacetimes. Our results hold for all inviscid, spherically symmetric and barotropic non-relativistic flows in the presence of an external conservative force. We demonstrate that such fluids always admit a dynamical description governed by a coupled pair of wave and continuity equations. We provide an iterative approach to solve these equations about any known stationary solution to all orders in perturbation. In the process, we reveal that there exists a dynamical acoustic spacetime on which fluctuations of the mass accretion rate propagate. The dynamical acoustic spacetime is shown to have a well defined causal structure and curvature. In addition, we find a classical fluctuation relation for the acoustic horizon of the spacetime that admit scenarios wherein the horizon can grow as well as recede, with the latter being a result with no known analogue in black holes. As an example, we numerically investigate the Bondi flow accreting solution subject to exponentially damped time dependent perturbations. We find that second and higher order classical perturbations possess an acoustic horizon that oscillates and changes to a new stable size at late times. In particular, the case of a receding acoustic horizon is realized through `low frequency' perturbations. We discuss our results in the context of more general analogue models and its potential implications on astrophysical accretion flows.
description: 42 pages, 33 figures. arXiv admin note: text overlap with arXiv:2005.14114
Hydrodynamic theory of $p-$atic liquid crystals
Creators: name: Giomi, Luca
name: Toner, John
name: Sarkar, Niladri
Publisher: name: arXiv
Year: 2021
Subjects: subject: Soft Condensed Matter (cond-mat.soft)
subject: FOS: Physical sciences

description: We formulate a comprehensive hydrodynamic theory of two-dimensional liquid crystals with generic $p-$fold rotational symmetry, also known as $p-$atics, of which mematics $(p=2)$ and hexatics $(p=6)$ are the two best known examples. Previous hydrodynamic theories of $p-$atics are characrerized by continuous ${\rm O}(2)$ rotational symmetry, which is higher than the discrete rotational symmetry of $p-$atic phases. By contrast, here we demonstrate that the discrete rotational symmetry allows the inclusion of additional terms in the hydrodynamic equations, which, in turn, lead to novel phenomena, such as the possibility of flow alignment at high shear rates, even for $p>2$. Furthermore, we show that any finite imposed shear will induce long-ranged orientational order in any $p-$atic liquid crystal, in contrast to the quasi-long-ranged order that occurs in the absence of shear. The induced order parameter scales like a non-universal power of the applied shear rate at small shear rates.
description: 25 pages, 7 figures
รูปแบบการอนุรักษ์วัฒนธรรม บ้านหนองบัว อำเภอภูหลวง จังหวัดเลย สำหรับการจัดการท่องเที่ยวอย่างยั่งยืน: ศิลปหัตถกรรมพื้นบ้าน
Creators: name: ไทยโรจน์ พวงมณี
name: คชสีห์ เจริญสุข
Publisher: name: สถาบันวิจัยและพัฒนา มหาวิทยาลัยราชภัฏเลย
Year: 2565
Subjects: รูปแบบการอนุรักษ์วัฒนธรรม
การจัดการท่องเที่ยวอย่างยั่งยืน
ศิลปหัตถกรรมพื้นบ้าน

description: วารสารวิจัยและพัฒนา มหาวิทยาลัยราชภัฏเลย, 17, 61, 7
Frédéric Duval _ La question des annotations (Journées cluster 5b, 29 septembre 2022)
Creators: name: Duval, Frédéric
Publisher: name: Zenodo
Year: 2022

description: Présentation théorique des besoins des laboratoires de textes en annotations scientifiques (apparat critique, commentaires scientifiques, gloses marginales et interlinéaires, glossaires, etc.)
description: Ce travail a bénéficié d'une aide de l'État gérée par l'Agence Nationale de la Recherche au titre du programme d'Investissements d'avenir portant la référence « ANR-21-ESRE-0005 » (ÉquipEx Biblissima+)
Dequantization of electric charge: Probing scenarios of cosmological multi-component dark matter
Creators: name: Van Loi, Duong
name: Duc, Nguyen Manh
name: Van Dong, Phung
Publisher: name: arXiv
Year: 2021
Subjects: subject: High Energy Physics - Phenomenology (hep-ph)
subject: High Energy Physics - Theory (hep-th)
subject: FOS: Physical sciences

description: Since the electric charge in the standard model is theoretically not quantized, we may have a variant of it, called dark charge. Similar to the electric charge, the dark charge neither commutes nor closes algebraically with $SU(2)_L$. The condition of algebraic closure leads to a novel gauge extension, $SU(2)_L \otimes U(1)_Y \otimes U(1)_N$, where $Y$ and $N$ determine the electric and dark charges, respectively, apart from the color group. We argue that the existence of the dark charge, thus $N$, leads to novel scenarios of multi-component dark matter, in general. The dark matter stability is determined by a residual (or dark charge) gauge symmetry isomorphic to an even $Z_k$ discrete group, where $k$ is specified dependent on the value of the neutrino dark charge. This residual symmetry divides the standard model particles into distinct classes, which possibly accommodate dark matter, but each dark matter candidate cannot decay due to the color and electric charge conservation. We analyze in detail three specific models according to $k=2,4,6$ and determine the simplest dark matter candidates. For small $U(1)_N$ coupling, the two-component dark matter scenarios implied by the dark charge successfully explain the dark matter relic density and the recent XENON1T excess, as well as the beam dump, neutrino scattering, and astrophysical bounds. Otherwise, for large $U(1)_N$ coupling, we have multi-WIMPs coexisted beyond the weak scale.
description: 41 pages, 5 figures; Matches published version
Redshift-space fluctuations in stochastic gravitational wave background
Creators: name: Ng, Kin-Wang
Publisher: name: arXiv
Year: 2021
Subjects: subject: Cosmology and Nongalactic Astrophysics (astro-ph.CO)
subject: General Relativity and Quantum Cosmology (gr-qc)
subject: FOS: Physical sciences

description: We study the redshift-space fluctuations induced by a stochastic gravitational wave background (SGWB) via the Sachs-Wolfe effect. The redshift-space fluctuations can be encapsulated in a line-of-sight integral that is useful for studying the imprint of short-wavelength gravitational waves on the cosmic microwave background (CMB) anisotropy. We thus derive constraints on the SGWB from small-scale CMB anisotropy measurements. Our results reproduce the constraint on the short-wavelength SGWB, previously derived from the Planck and BICEP/Keck array CMB data with a CMB Boltzmann numerical code. Furthermore, we improve the constraint and extend it to shorter wavelengths by using the CMB measurements made by the Atacama Cosmology Telescope and the South Pole Telescope. Also, the integral provides us with a precise redshift fluctuation correlation between a pair of pulsars in pulsar timing measurements, which conveniently incorporates the effect of the pulsar term into a small-angle correlation. We further discuss the observation of pulsar pairs in globular clusters to look for this small-angle correlation.
description: 2 new figures and references added, a subsection on CMB constraints added, accepted for publication in PRD
title: Waffensysteme und Großgerät der Bundeswehr
Creators: name: Bundesministerium Der Verteidigung
Publisher: name: Fachinformationszentrum der Bundeswehr
Year: 2023

description: Die Broschüre stellt in bebilderter Form mit jeweils kurzen Beschreibungen und den wichtigsten technischen Daten die Waffensysteme und das Großgerät der drei Teilstreitkräfte (Heer, Luftwaffe, Marine) sowie des Sanitätsdienstes, der Streitkräftebasis und des Kommandos Cyber- und Infomationsraum (CIR) der Bundeswehr vor.
Thermodynamic Integration Methods, Infinite Swapping and the Calculation of Generalized Averages
Creators: name: Doll, J. D.
name: Dupuis, P.
name: Nyquist, P.
Publisher: name: arXiv
Year: 2016
Subjects: subject: Statistical Mechanics (cond-mat.stat-mech)
subject: FOS: Physical sciences

description: In the present paper we examine the risk-sensitive and sampling issues associated with the problem of calculating generalized averages. By combining thermodynamic integration and Stationary Phase Monte Carlo techniques, we develop an approach for such problems and explore its utility for a prototypical class of applications.
Active Learning with Multifidelity Modeling for Efficient Rare Event Simulation
Creators: name: Dhulipala, S. L. N.
name: Shields, M. D.
name: Spencer, B. W.
name: Bolisetti, C.
name: Slaughter, A. E.
name: Laboure, V. M.
name: Chakroborty, P.
Publisher: name: arXiv
Year: 2021
Subjects: subject: Machine Learning (stat.ML)
subject: Machine Learning (cs.LG)
subject: Applications (stat.AP)
subject: FOS: Computer and information sciences

description: While multifidelity modeling provides a cost-effective way to conduct uncertainty quantification with computationally expensive models, much greater efficiency can be achieved by adaptively deciding the number of required high-fidelity (HF) simulations, depending on the type and complexity of the problem and the desired accuracy in the results. We propose a framework for active learning with multifidelity modeling emphasizing the efficient estimation of rare events. Our framework works by fusing a low-fidelity (LF) prediction with an HF-inferred correction, filtering the corrected LF prediction to decide whether to call the high-fidelity model, and for enhanced subsequent accuracy, adapting the correction for the LF prediction after every HF model call. The framework does not make any assumptions as to the LF model type or its correlations with the HF model. In addition, for improved robustness when estimating smaller failure probabilities, we propose using dynamic active learning functions that decide when to call the HF model. We demonstrate our framework using several academic case studies and two finite element (FE) model case studies: estimating Navier-Stokes velocities using the Stokes approximation and estimating stresses in a transversely isotropic model subjected to displacements via a coarsely meshed isotropic model. Across these case studies, not only did the proposed framework estimate the failure probabilities accurately, but compared with either Monte Carlo or a standard variance reduction method, it also required only a small fraction of the calls to the HF model.
The Role of Star-Formation and AGN in Dust Heating of z=0.3-2.8 Galaxies - II. Informing IR AGN fraction estimates through simulations
Creators: name: Roebuck, Eric
name: Sajina, Anna
name: Hayward, Christopher C.
name: Pope, Alexandra
name: Kirkpatrick, Allison
name: Hernquist, Lars
name: Yan, Lin
Publisher: name: arXiv
Year: 2016
Subjects: subject: Astrophysics of Galaxies (astro-ph.GA)
subject: FOS: Physical sciences

description: A key question in extragalactic studies is the determination of the relative roles of stars and AGN in powering dusty galaxies at $z\sim$1-3 where the bulk of star-formation and AGN activity took place. In Paper I, we present a sample of $336$ 24$μ$m-selected (Ultra)Luminous Infrared Galaxies, (U)LIRGs, at $z \sim 0.3$-$2.8$, where we focus on determining the AGN contribution to the IR luminosity. Here, we use hydrodynamic simulations with dust radiative transfer of isolated and merging galaxies, to investigate how well the simulations reproduce our empirical IR AGN fraction estimates and determine how IR AGN fractions relate to the UV-mm AGN fraction. We find that: 1) IR AGN fraction estimates based on simulations are in qualitative agreement with the empirical values when host reprocessing of the AGN light is considered; 2) for star-forming galaxy-AGN composites our empirical methods may be underestimating the role of AGN, as our simulations imply $>$50% AGN fractions, $\sim$3$\times$ higher than previous estimates; 3) 6% of our empirically classified "SFG" have AGN fractions $\gtrsim$50%. While this is a small percentage of SFGs, if confirmed, would imply the true number density of AGN may be underestimated; 4) this comparison depends on the adopted AGN template -- those that neglect the contribution of warm dust lower the empirical fractions by up to 2$\times$; and 5) the IR AGN fraction is only a good proxy for the intrinsic UV-mm AGN fraction when the extinction is high ($A_V\gtrsim 1$ or up to and including coalescence in a merger).
description: 18 pages, 11 figures; ApJ accepted for publication
มูลค่าความเต็มใจยอมรับส่วนต่างราคารับซื้ออ้อยสดและอ้อยเผาของเกษตรกร ตำบลปากปวน อำเภอวังสะพุง จังหวัดเลย
Creators: name: กรรณิการ์ กาวน
name: สุนิตา สารวงษ์
name: อนุชา วิลัยแก้ว
Publisher: name: สถาบันวิจัยและพัฒนา มหาวิทยาลัยราชภัฏเลย
Year: 2565
Subjects: ความเต็มใจยอมรับ
อ้อยเผา
การประเมินมูลค่าโดยวิธีการสมมุติเหตุการณ์

description: วารสารวิจัยและพัฒนา มหาวิทยาลัยราชภัฏเลย, 17, 61, 17
Quantum size effects, multiple Dirac cones and edge states in ultrathin Bi(110) films
Creators: name: Kundu, Asish K.
name: Gu, Genda
name: Valla, Tonica
Publisher: name: arXiv
Year: 2021
Subjects: subject: Materials Science (cond-mat.mtrl-sci)
subject: FOS: Physical sciences

description: The presence of inherently strong spin-orbit coupling in bismuth, its unique layer-dependent band topology and high carrier mobility make it an interesting system for both fundamental studies and applications. Theoretically, it has been suggested that strong quantum size effects should be present in the Bi(110) films, with the possibility of Dirac fermion states in the odd-bilayer (BL) films, originating from dangling $p_z$ orbitals and quantum-spin hall (QSH) states in the even-bilayer films. However, the experimental verification of these claims has been lacking. Here, we study the electronic structure of Bi(110) films grown on a high-$T_c$ superconductor, Bi$_2$Sr$_2$CaCu$_2$O$_{8+δ}$ (Bi2212) using angle-resolved photoemission spectroscopy (ARPES). We observe an oscillatory behavior of electronic structure with the film thickness and identify the Dirac-states in the odd-bilayer films, consistent with the theoretical predictions. In the even-bilayer films, we find another Dirac state that was predicted to play a crucial role in the QSH effect. In the low thickness limit, we observe several extremely one-dimensional states, probably originating from the edge-states of Bi(110) islands. Our results provide a much needed experimental insight into the electronic and structural properties of Bi(110) films.
description: 8 pages, 5 figures
How to Set Up Data Repository Services in a University - Introduction
Creators: name: Research Data Management Working Group
Publisher: name: Zenodo
Year: 2023
Subjects: Pre-conference workshop 7: How to set up data repository services in a university?
data repository
data archive

description: Organised by the Research Data Management Working Group The workshop is looking for answers to the following questions: How to set up a data repository in a library or university; What are some of the practical topics and activities that need to be considered: like GDPR issues, checklist of researchers for depositing their data in a repository (activities prior to archiving data); What kind of FAIRification tools are available for data repositories; How to register data in the EOSC portal. In the workshop, we will: hear stories about building up a repository presented by libraries that already have a data repository, data archive or data curation service; have a group work session around guidance needed for depositing data to a data repository.
Text analysis of corporate statements made in response to societal disruptions
Creators: name: Composto, Jordana
Publisher: name: OSF Registries
Year: 2021
Subjects: subject: Industrial and Organizational Psychology
subject: Social Psychology
subject: Social and Behavioral Sciences
subject: Psychology
subject: FOS: Psychology

description: STM, LSA, and sentiment analysis is used to analyze corporate statements made in response to COVID -19, the BLM protests following George Floyd's murder, and climate change. The texts are collected and assembled in this publicly available corpus.
Characterization of Silicon Photomultipliers after proton irradiation up to $10^{12} n_{eq}/mm^2$
Creators: name: Altamura, A. R.
name: Acerbi, F.
name: Nociforo, C.
name: Regazzoni, V.
name: Mazzi, A.
name: Gola, A.
Publisher: name: arXiv
Year: 2021
Subjects: subject: Instrumentation and Detectors (physics.ins-det)
subject: High Energy Physics - Experiment (hep-ex)
subject: FOS: Physical sciences

description: Silicon photomultipliers (SiPMs) are highly-sensitive photodetectors emerging as the technology of choice for many applications, including large high-energy physics experiments where they often are exposed to high radiation fluences. In recent years, there has been an increasing interest in assessing the performance deterioration of such detectors after the irradiation with proton or neutron, with different fluence levels. In this work, samples of different FBK SiPM technologies, made with different manufacturing technologies, were irradiated at the INFN-LNS facility (Italy) with protons reaching fluences up to $10^{12}n_{eq}/mm^2$ (1 MeV neutron equivalent) which correspond $10^{14}n_{eq}/cm^2$ to and their performances were characterized in detail after an approximately 30 days room temperature annealing. The results show a significant worsening of the primary noise (dark count rate) of the detectors, which increases with the irradiation dose, whereas the other performance parameters like the micro-cell gain, the correlated noise probability and the photon detection efficiency do not show significant variations over the investigated dose range. The breakdown voltage estimation after irradiation is another important aspect for a SiPM. In this contribution, we show several methods for its estimation and compare the results. We also introduced new methodologies to characterize the performance of the SiPMs when they present a very high level of noise. Lastly, we also analyzed the spatial localization of the proton-induced defects inside the device, i.e. the defects that mostly contribute to the increase of the DCR of the device, through the emission microscopy (EMMI) technique. In particular, we analyzed the SiPMs at the single cell level, trying to identify and spatially localize the defects.
Magnetic eigenmaps for community detection in directed networks
Creators: name: Fanuel, Michaël
name: Alaíz, Carlos M.
name: Suykens, Johan A. K.
Publisher: name: arXiv
Year: 2016
Subjects: subject: Physics and Society (physics.soc-ph)
subject: Social and Information Networks (cs.SI)
subject: Mathematical Physics (math-ph)
subject: FOS: Physical sciences
subject: FOS: Computer and information sciences

description: Communities in directed networks have often been characterized as regions with a high density of links, or as sets of nodes with certain patterns of connection. Our approach for community detection combines the optimization of a quality function and a spectral clustering of a deformation of the combinatorial Laplacian, the so-called magnetic Laplacian. The eigenfunctions of the magnetic Laplacian, that we call magnetic eigenmaps, incorporate structural information. Hence, using the magnetic eigenmaps, dense communities including directed cycles can be revealed as well as "role" communities in networks with a running flow, usually discovered thanks to mixture models. Furthermore, in the spirit of the Markov stability method, an approach for studying communities at different energy levels in the network is put forward, based on a quantum mechanical system at finite temperature.
description: 15 pages
title: An application of the techniques of linear programming to the transportation of coal
Creators: name: Land, Ailsa Horton
Publisher: name: London School of Economics and Political Science (LSE)
Year: 1956

description: The object of this study was to find the minimum transport cost routing pattern for coal delivery to coke ovens. The quantities available at each colliery and required at each coke oven were assumed to be the same as the quantities actually available and required during one particular month. A model is developed from the Koopmans transport model of linear programming for minimizing rail ton-mileage travelled by a homogeneous commodity. The method of finding solution to this model, which makes it possible to compute a larger problem by hand than would be possible using the standard computing methods, which is described in detail. The problem peculiar to applying the model to coal transport are considered and the methods of modifying the model to take account of these peculiarities - particularly the non-homogeneity of coal - are discussed. The optimum solution is compared to the actual transport pattern, and it is found that a reduction of 10% in the total ton-mileage could have been made by the application of linear programming. It is estimated that this is equivalent to a saving of the order of £500 thousand per annum in the transport cost of coking coal. The field of problems which remain to be studied is briefly surveyed. This includes applications of the model to all forms of coal transport and to other commodities, and the further research required into computing methods. The "dual" solution of the linear programming model can be interpreted as the price for coal in the different geographical regions. The relevance of these prices to the pricing and development policy in the National Coal Board is discussed.
ปัจจัยที่มีผลต่อความยากจนและความเหลื่อมล้ำของรายได้ของผู้มีรายได้น้อย: กรณีศึกษาอำเภอเมือง จังหวัดเพชรบูรณ์
Creators: name: พิมพ์พร เกษดี
Publisher: name: สถาบันวิจัยและพัฒนา มหาวิทยาลัยราชภัฏเลย
Year: 2565
Subjects: ความยากจน
ความเหลื่อมล้ำ
ผู้มีรายได้น้อย

description: วารสารวิจัยและพัฒนา มหาวิทยาลัยราชภัฏเลย, 17, 61, 26
Replacing Noble Metals with Alternative Materials in Plasmonics and Metamaterials: how good an idea?
Creators: name: Khurgin, Jacob B
Publisher: name: arXiv
Year: 2016
Subjects: subject: Optics (physics.optics)
subject: FOS: Physical sciences

description: Noble metals that currently dominate the fields of plasmonics and metamaterials suffer from large ohmic losses. New plasmonic materials, such as doped oxides and nitrides, have smaller material loss, and, using them in place of metals carries promise of reduced-loss plasmonic and metamaterial structures, with sharper resonances and higher field concentration. This promise is put to a rigorous analytical test in this work which reveals that having low material loss is not sufficient to have a reduced modal loss in plasmonic structures. To reduce the modal loss it is absolutely necessary for the plasma frequency to be significantly higher than the operational frequency. Using examples of nanoparticle plasmons and gap plasmons one comes to the conclusion that even in the mid-infrared spectrum metals continue to hold advantage over the alternative media. The new materials may still find application niche where the high absorption loss is beneficial, e.g. in medicine and thermal photovoltaics.
Stéphane Lecouteux _ Compte rendu (Journées cluster 5b, 28 septembre 2022)
Creators: name: Lecouteux, Stéphane
Publisher: name: Zenodo
Year: 2022
Subjects: cluster 5b
XML TEI
laboratoire de textes

description: Compte rendu des journées annuelles du cluster 5b de Biblissima+ organisées à la MRSH de Caen les 28 et 29 septembre 2022
description: Ce travail a bénéficié d'une aide de l'État gérée par l'Agence Nationale de la Recherche au titre du programme d'Investissements d'avenir portant la référence « ANR-21-ESRE-0005 » (ÉquipEx Biblissima+)
TREEHOOSE - an Open Source, Cloud-based Trusted Research Environment
Creators: name: Li, Simon
name: Gao, Chuang
name: Sutherland, James
name: Jefferson, Emily
name: Cole, Christian
Publisher: name: Zenodo
Year: 2022
Subjects: Trusted Research Environment
Cloud Computing
Open Source
Infrastructure as Code

description: Analysis of sensitive data for the purpose of national statistics, social policy and healthcare research is challenging as it requires significant governance and ethical oversight. Where and how the analysis is performed is controlled by the data controller as the data cannot be freely shared often resides within a monolithic computing environment. These computing environments are referred to as Data Safe Havens (DSHs), Trusted Research Environments (TREs) or Research Data Centres (RDCs). TREs may not have all the usual tools a data scientist or analyst is used to and may have limited computing resources. Supporting these environments by the data controller is resource intensive. The public cloud provides access to powerful, flexible and scalable computing resources based on the needs of the user. There are no capital costs and maintenance requirements are reduced. The Health Informatics Centre (HIC) has >10 years experience of managing a TRE and we have developed an open source – infrastructure-as-code – Trusted Research Environment (TRE) toolkit which can be deployed in the public cloud for a safe, secure and scalable computing environment suitable for working with clinical patient data or other sensitive data.
title: Yield and quality affecting pathogens on Horseradish (Armoracia rusticana)
Creators: name: Zange, Birgit
name: Schmidt-Heydt, Markus
name: Richert-Pöggeler, Katja
name: Westermeier, Gisela
Publisher: name: Julius Kühn-Institut
Year: 2016

description: Julius-Kühn-Archiv 453
title: Radiometrie für die EUV-Lithographie
Creators: name: Scholze, Frank
name: Laubis, Christian
name: Barboutis, Annett
name: Buchholz, Christian
name: Fischer, Andreas
name: Puls, Jana
name: Stadelhoff, Christian
Publisher: name: Physikalisch-Technische Bundesanstalt (PTB)
Year: 2014
Subjects: subject: EUV-Strahlung
subject: Reflektometrie
subject: Optik
subject: Spiegel
subject: EUV-Lithographie (EUVL)
subject: EUVL
subject: Halbleiterbauelemente

description: PTB-Mitteilungen. Band 124 (2014), Heft 4, Seite 3 - 7. ISSN 0030-834X
SES and confrontation
Creators: name: Laurin, Kristin
name: Tracy, Jessica
name: Mercadante, Eric
name: Engstrom, Holly
Publisher: name: OSF Registries
Year: 2024
Subjects: subject: Social Psychology
subject: Social and Behavioral Sciences
subject: Psychology
subject: FOS: Psychology

description: This study examines the effect of socioeconomic status (SES) on people's willingness to confront someone who makes an offensive (e.g., racist, sexist) comment.
Numerical approximation of singular Forward-Backward SDEs
Creators: name: Chassagneux, Jean-François
name: Yang, Mohan
Publisher: name: arXiv
Year: 2021
Subjects: subject: Numerical Analysis (math.NA)
subject: Probability (math.PR)
subject: Computational Finance (q-fin.CP)
subject: FOS: Mathematics
subject: FOS: Economics and business
subject: 65C30 (Primary) 65C20, 65M12, 60H35 (Secondary)

description: In this work, we study the numerical approximation of a class of singular fully coupled forward backward stochastic differential equations. These equations have a degenerate forward component and non-smooth terminal condition. They are used, for example, in the modeling of carbon market[9] and are linked to scalar conservation law perturbed by a diffusion. Classical FBSDEs methods fail to capture the correct entropy solution to the associated quasi-linear PDE. We introduce a splitting approach that circumvent this difficulty by treating differently the numerical approximation of the diffusion part and the non-linear transport part. Under the structural condition guaranteeing the well-posedness of the singular FBSDEs [8], we show that the splitting method is convergent with a rate $1/2$. We implement the splitting scheme combining non-linear regression based on deep neural networks and conservative finite difference schemes. The numerical tests show very good results in possibly high dimensional framework.
A Photo-Hadronic Model of the Large Scale Jet of PKS 0637-752
Creators: name: Kusunose, Masaaki
name: Takahara, Fumio
Publisher: name: arXiv
Year: 2016
Subjects: subject: High Energy Astrophysical Phenomena (astro-ph.HE)
subject: FOS: Physical sciences

description: Strong X-ray emission from large scale jets of radio loud quasars still remains an open problem. Models based on inverse Compton scattering off CMB photons by relativistically beamed jets have recently been ruled out, since Fermi LAT observations for 3C 273 and PKS 0637-752 give the upper limit far below the model prediction. Synchrotron emission from a separate electron population with multi-hundred TeV energies remains a possibility although its origin is not well known. We examine a photo-hadronic origin of such high energy electrons/positrons, assuming that protons are accelerated up to $10^{19}$ eV and produce electrons/positrons through Bethe-Heitler process and photo-pion production. These secondary electrons/positrons are injected at sufficiently high energies and produce X-rays and $γ$-rays by synchrotron radiation without conflicting with the Fermi LAT upper limits. We find that the resultant spectrum well reproduces the X-ray observations from PKS 0637-752, if the proton power is at least $10^{49} \text{erg} \, \text{s}^{-1}$, which is highly super-Eddington. It is noted that the X-ray emission originates primarily from leptons through Bethe-Heitler process, while leptons from photo-pion origin lose energy directly through synchrotron emission of multi-TeV photons rather than cascading. To avoid the overproduction of the optical flux, optical emission is primarily due to synchrotron emission of secondary leptons rather than primary electrons, or a mild degree of beaming of the jet is needed, if it is owing to the primary electrons. Proton synchrotron luminosity is a few orders of magnitude smaller.
description: 10 pages, 5 figures, 1 table. To be published in the Astrophysical Journal
Coherent information of a quantum channel or its complement is generically positive
Creators: name: Singh, Satvik
name: Datta, Nilanjana
Publisher: name: arXiv
Year: 2021
Subjects: subject: Quantum Physics (quant-ph)
subject: Information Theory (cs.IT)
subject: Mathematical Physics (math-ph)
subject: FOS: Physical sciences
subject: FOS: Computer and information sciences

description: The task of determining whether a given quantum channel has positive capacity to transmit quantum information is a fundamental open problem in quantum information theory. In general, the coherent information needs to be computed for an unbounded number of copies of a channel in order to detect a positive value of its quantum capacity. However, in this Letter, we show that the coherent information of a single copy of a randomly selected channel is positive almost surely if the channel's output space is larger than its environment. Hence, in this case, a single copy of the channel typically suffices to determine positivity of its quantum capacity. Put differently, channels with zero coherent information have measure zero in the subset of channels for which the output space is larger than the environment. On the other hand, if the environment is larger than the channel's output space, identical results hold for the channel's complement.
description: Minor modifications with updated references
การพัฒนาเศรษฐกิจการท่องเที่ยวลุ่มน้ำทะเลสาบสงขลา สู่การเป็นเมืองเป้าหมายทางการท่องเที่ยวแบบบูรณาการอย่างยั่งยืน
Creators: name: สาลินี ทิพย์เพ็ง
Publisher: name: สถาบันวิจัยและพัฒนา มหาวิทยาลัยราชภัฏเลย
Year: 2565
Subjects: การพัฒนาเศรษฐกิจการท่องเที่ยว
เมืองเป้าหมายทางการท่องเที่ยว
การท่องเที่ยวอย่างยั่งยืน

description: วารสารวิจัยและพัฒนา มหาวิทยาลัยราชภัฏเลย, 17, 61, 36
Effect of flexural phonons on the hole states in single-layer black phosphorus
Creators: name: Brener, S.
name: Rudenko, A. N.
name: Katsnelson, M. I.
Publisher: name: arXiv
Year: 2016
Subjects: subject: Mesoscale and Nanoscale Physics (cond-mat.mes-hall)
subject: Materials Science (cond-mat.mtrl-sci)
subject: FOS: Physical sciences

description: Flexural thermal fluctuations in crystalline membranes affect the band structure of the carriers, which leads to an exponential density-of-states (DOS) tail beyond the unperturbed band edge. We present a theoretical description of this tail for a particular case of holes in single-layer black phosphorus, a material which exhibits an extremely anisotropic quasi-one-dimensional dispersion ($m_y/m_x\gg1$) and, as a result, an enhanced Van Hove singularity at the valence band top. The material parameters are determined by {\it ab initio} calculations and then are used for quantitative estimation of the effect of two-phonon (flexural) processes have on the charge carrier DOS. It is shown that unlike the isotropic case, the physics is determined by the phonons with wavevectors of the order of $q^*$, where $q^*$ determines the crossover between harmonic and anharmonic behavior of the flexural phonons. The spectral density of the holes in single-layer black phosphorus at finite temperatures is calculated.
description: 6 pages including appendix, 2 figures
Approximation of the potential in scalar field dark energy models
Creators: name: Battye, Richard A.
name: Pace, Francesco
Publisher: name: arXiv
Year: 2016
Subjects: subject: Cosmology and Nongalactic Astrophysics (astro-ph.CO)
subject: General Relativity and Quantum Cosmology (gr-qc)
subject: FOS: Physical sciences

description: We study the nature of potentials in scalar field based models for dark energy - with both canonical and noncanonical kinetic terms. We calculate numerically, and using an analytic approximation around $a\approx 1$, potentials for models with constant equation-of-state parameter, $w_ϕ$. We find that for a wide range of models with canonical and noncanonical kinetic terms there is a simple approximation for the potential that holds when the scale factor is in the range $0.6\lesssim a\lesssim 1.4$. We discuss how this form of the potential can also be used to represent models with non-constant $w_ϕ$ and, hence, how it could be used in reconstruction from cosmological data.
description: 17 pages, 6 figures. Accepted by Phys. Rev. D
Quantifying uncertainty with ensembles of surrogates for blackbox optimization
Creators: name: Audet, Charles
name: Digabel, Sébastien Le
name: Saltet, Renaud
Publisher: name: arXiv
Year: 2021
Subjects: subject: Optimization and Control (math.OC)
subject: FOS: Mathematics
subject: G.1.6
subject: 90C56: Derivative-free methods

description: This work is in the context of blackbox optimization where the functions defining the problem are expensive to evaluate and where no derivatives are available. A tried and tested technique is to build surrogates of the objective and the constraints in order to conduct the optimization at a cheaper computational cost. This work proposes different uncertainty measures when using ensembles of surrogates. The resulting combination of an ensemble of surrogates with our measures behaves as a stochastic model and allows the use of efficient Bayesian optimization tools. The method is incorporated in the search step of the mesh adaptive direct search (MADS) algorithm to improve the exploration of the search space. Computational experiments are conducted on seven analytical problems, two multi-disciplinary optimization problems and two simulation problems. The results show that the proposed approach solves expensive simulation-based problems at a greater precision and with a lower computational effort than stochastic models.
description: 36 pages, 11 figures, submitted
Overdose deaths in the welfare state
Creators: name: Rogeberg, Ole
Publisher: name: OSF Registries
Year: 2024
Subjects: subject: Public Health
subject: Medicine and Health Sciences
subject: Epidemiology

description: A descriptive statistical analysis of how drug overdose death rates for men differ across groups defined in terms of family economic background (father's earning rank) and own educational attainment (grade point average at the end of the compulsory school system) and cognitive ability (measured at military conscription).
Comparative judgment and proof
Creators: name: Davies, Ben
Publisher: name: Loughborough University
Year: 2020
Subjects: subject: 19999 Mathematical Sciences not elsewhere classified
subject: FOS: Mathematics

description: Proof is a central concept in mathematics, pivotal both to the practice of mathematicians and to students’ education in the discipline. The research community, however, has failed to reach a consensus on how proof should be conceptualised.Moreover, we know little of what mathematicians and students think about proof, and are limited in the tools we use to assess students’ understanding.
This thesis introduces comparative judgment to the proof literature via two tasks evaluated by judges performing a series of pairwise comparisons. The Conceptions Task asks for a written explanation of what mathematicians meanby proof. The Summary Task asks for a summary of a given proof, available to respondents as they complete the task.
Having established robust evidence supporting the reliability and validity of both tasks, I then use these tasks to develop an understanding of the conceptions of proof held by mathematicians and students. I also generate insights forassessment, leading to an argument for the unidimensionality of proof comprehension in early undergraduate mathematics.
In conducting this research I adopt a mixed methods approach based on the philosophy of pragmatism. By using a range of methodological approaches, from statistical modelling to thematic analysis of interviews with judges, I develop amulti-faceted understanding of both the validity of the tasks, and the behaviours and priorities of the participants involved.
The Conceptions Task outcomes establish that mathematicians primarily think of proof in terms of argumentation, while students emphasise the arguablymore philosophically naive notion of certainty.
The Summary Task outcomes establish that references to the method of proof and key mathematical objects are most valued by mathematician judges. Further, from correlational analyses of various quantitative measures, I learn that the Summary Task scores are meaningfully reflective of local proof comprehension but are not related to more general measures of mathematical performance.
Several open questions are identified. In particular, there is still much to learn about judges’ decision-making processes in comparative judgment settings, the dimensionality of proof comprehension, and the range of proofs for which the Summary Task is applicable. Future work on these questions is outlined in the final chapter, alongside the practical applications and theoretical implications of this work.
Predicting Drought and Subsidence Risks in France
Creators: name: Charpentier, Arthur
name: James, Molly
name: Ali, Hani
Publisher: name: arXiv
Year: 2021
Subjects: subject: Applications (stat.AP)
subject: General Economics (econ.GN)
subject: FOS: Computer and information sciences
subject: FOS: Economics and business

description: The economic consequences of drought episodes are increasingly important, although they are often difficult to apprehend in part because of the complexity of the underlying mechanisms. In this article, we will study one of the consequences of drought, namely the risk of subsidence (or more specifically clay shrinkage induced subsidence), for which insurance has been mandatory in France for several decades. Using data obtained from several insurers, representing about a quarter of the household insurance market, over the past twenty years, we propose some statistical models to predict the frequency but also the intensity of these droughts, for insurers, showing that climate change will have probably major economic consequences on this risk. But even if we use more advanced models than standard regression-type models (here random forests to capture non linearity and cross effects), it is still difficult to predict the economic cost of subsidence claims, even if all geophysical and climatic information is available.
title: Un espace des raisons pour une école démocratique
Creators: name: Dechamboux, Lionel
Publisher: name: La Revue LEeE
Year: 2023
Subjects: subject: évaluation
subject: démocratie
subject: bilan de fin de séance
subject: recherche collaborative

description: Cette contribution se penche sur les justifications établissant un lien possible entre démocratie et école et essaie de se doter de critères permettant de supposer qu’une école serait démocratique ou non. Ces critères s’incarneraient dans un espace des raisons où l’enseignant·e permettrait des discussions à propos des activités réalisées et partagerait avec ses élèves (voire coconstruirait avec eux) les critères de réussites de ces mêmes tâches. Cet article présente ensuite pour illustrer cette réflexion une recherche collaborative effectuée dans un établissement secondaire préprofessionnel à Genève avec des enseignant·es de français réfléchissant à l’intérêt et à la structuration de bilans de fin de séance. Ces bilans sont considérés ici comme correspondant potentiellement à cet espace des raisons attestant d’un apprentissage de la démocratie et pouvant permettre à ces élèves en difficultés d’effectuer des apprentissages scolaires plus en profondeur.
Energy budget of forming clumps in numerical simulations of collapsing clouds
Creators: name: Camacho, Vianey
name: Vázquez-Semadeni, Enrique
name: Ballesteros-Paredes, Javier
name: Gómez, Gilberto C.
name: Fall, S. Michael
name: Mata-Chávez, M. Dolores
Publisher: name: arXiv
Year: 2016
Subjects: subject: Astrophysics of Galaxies (astro-ph.GA)
subject: FOS: Physical sciences

description: We analyze the physical properties and energy balance of density enhancements in two SPH simulations of the formation, evolution, and collapse of giant molecular clouds. In the simulations, no feedback is included, so all motions are due either to the initial, decaying turbulence, or to gravitational contraction. We define clumps as connected regions above a series of density thresholds. The resultingfull set of clumps follows the generalized energy-equipartition relation $σ_{v}/R^{1/2} \propto Σ^{1/2}$, where $σ_{v}$ is the velocity dispersion, $R$ is the "radius", and $Σ$ is the column density. We interpret this as a natural consequence of gravitational contraction at all scales, rather than virial equilibrium. Nevertheless, clumps with low $Σ$ tend to show a large scatter around equipartition. In more than half of the cases, this scatter is dominated by external turbulent compressions that {\it assemble} the clumps, rather than by small-scale random motions that would disperse them. The other half does actually disperse. Moreover, clump sub-samples selected by means of different criteria exhibit different scalings. Sub-samples with narrow $Σ$ ranges follow Larson-like relations, although characterized by their respective value of $Σ$. Finally, we find that: i) clumps lying in filaments tend to appear sub-virial; ii) high-density cores ($n \ge 10^5$ cm$^3$) that exhibit moderate kinetic energy excesses often contain sink ("stellar") particles, and the excess disappears when the stellar mass is taken into account in the energy balance; iii) cores with kinetic energy excess but no stellar particles are truly in a state of dispersal.
description: Abstract rephrased. Submitted to ApJ