cometadata/datacite-rtg-text-other-reclassification-records huggingface dataset:
title: Fishing capacity assessment in the Eastern Mediterranean purse seine fisheries
Creators: name: Tsitsika, Efthymia V.
name: Maravelias, Christos D.
name: Haralabous, John
Publisher: name: ASC 2008 - Theme session I
Year: 2024
Subjects: Fisheries and aquaculture
Pressures, impacts, conservation, and management

description: No abstracts are to be cited without prior reference to the author.Excessive fishing capacity being responsible for the degradation of fishery resources and for significant economic waste is also globally recognized by resource managers as a major problem for fisheries. In the absence of TACs or quotas in the Mediterranean, the fisheries management system depends heavily on technical measures and effort control programmes including limited entry and decommissioning schemes. Estimates of fishing capacity and capacity utilization may provide helpful tools in designing an effective capacity management plan for the Mediterranean fisheries. Data Envelopment Analysis (DEA) was implemented to estimate capacity utilization and efficiency of the Eastern Mediterranean purse seiners. The two fleet segments were found to operate below their capacity output level indicating the existence of overcapacity. The 24-40 m segment was evidenced to be more efficient than the 12-24 m fleet segment. Results suggested that purse seiners could have increased their earnings during the study period through increasing the variable inputs, for example days fished. An assessment of additional factors that might affect the technical efficiency scores in the fishery was performed using Tobit analysis. It was found that the crew size, the monthly average price of fish and temporal factors significantly affected the technical efficiency scores. In data poor environments, such as the Mediterranean Sea, the DEA and Tobit models applied in this study provided useful insights to fleet capacity and efficiency assessment
title: Incorporating uncertainty into management - an INEXFISH appraoch
Creators: name: Scott, Catherine L.
Publisher: name: ASC 2008 - Theme session I
Year: 2024
Subjects: Fisheries and aquaculture
Pressures, impacts, conservation, and management

description: No abstracts are to be cited without prior reference to the author.Scientific advice for fisheries is provided to try to ensure that fish spawning stock biomass (SSB) is maintained at a sufficiently high level, such that recruitment is not impaired.
Causality, delocalization and positivity of energy
Creators: name: Karpov, E.
name: Ordonez, G.
name: Petrosky, T.
name: Prigogine, I.
name: Pronko, G.
Publisher: name: arXiv
Year: 2000
Subjects: subject: Quantum Physics (quant-ph)
subject: FOS: Physical sciences

description: In a series of interesting papers G. C. Hegerfeldt has shown that quantum systems with positive energy initially localized in a finite region, immediately develop infinite tails. In our paper Hegerfeldt's theorem is analysed using quantum and classical wave packets. We show that Hegerfeldt's conclusion remains valid in classical physics. No violation of Einstein's causality is ever involved. Using only positive frequencies, complex wave packets are constructed which at $t = 0$ are real and finitely localized and which, furthemore, are superpositions of two nonlocal wave packets. The nonlocality is initially cancelled by destructive interference. However this cancellation becomes incomplete at arbitrary times immediately afterwards. In agreement with relativity the two nonlocal wave packets move with the velocity of light, in opposite directions.
description: 14 pages, 5 figures
Aspectos epistemológicos da ciência da informação e o comportamento informacional: diálogos com Borko, Le Coadic e Saracevic
Creators: name: Anna, Jorge Santa
Publisher: name: figshare
Year: 2018
Subjects: subject: 80706 Librarianship
subject: FOS: Media and communications
subject: Library and Information Studies

description: Os estudos sobre usuários e seus comportamentos no que tange à busca por informação têm demonstrado o quanto o aspecto humano-social tem sido valorizado pelas ciências, sobretudo na Ciência da Informação. Portanto, apresenta-se pesquisa preliminar, cujo objetivo é discorrer alguns aspectos epistemológicos da Ciência da Informação, bem como os estudos do comportamento informacional, tendo como base teórica as reflexões apresentadas por Borko, Le Coadic e Saracevic. Por meio de pesquisa descritiva ebibliográfica de abordagem dedutiva, confirmou-se que a Ciência da Informação estuda o objeto informação eos procedimentos para coleta, armazenagem e uso desse recurso, caracterizando-se como uma ciência interdisciplinar, influenciada pelas tecnologias da informação e comunicação, cuja origem desse campo científico remete aos reflexos do desenvolvimento científico e tecnológico do século XX. Além disso, concluiu-se que os estudos das necessidades e do uso da informação, com foco no usuário, viabiliza a importância do ser humano, como principal elemento do processo informacional, sendo que os estudos vêm se aperfeiçoando, em que são investigadas questões comportamentais quanto ao uso dos recursos, produtos, serviços e sistemas de informação.
title: Studying the carrying capacity of Mont Saint Michel Bay (France): respective role of the main filter-feeders
Creators: name: Cugier, Philippe
name: Struski, Caroline
name: Blanchard, Michel
name: Mazurié, Joseph
name: Pouvreau, Stéphane
name: Olivier, Frédéric
Publisher: name: ASC 2008 - Theme session H
Year: 2024
Subjects: Fisheries and aquaculture

description: No abstracts are to be cited without prior reference to the author.The macrobenthic community in the bay of Mont-Saint-Michel (English Channel, France) is mainly dominated by filter-feeders, including cultivated species (oysters and mussels). The decline in farming production, along with the significant spreading of the invasive slipper limpet Crepidula fornicata (150.000 T), have led scientists and stakeholders to question about the trophic balance between cultivated and wild (native or invasive nonnative) filter-feeders. An ecological model of the bay was developed, coupling a 2D hydro-sedimentary model (SiAM) and biological models for primary production and filter feeder filtration. The filter feeder model includes cultivated (mussels Mytilus edulis and oysters Crassostrea gigas and Ostrea edulis), invasive (Crepidula fornicata) and wild native species (Abra alba, Cerastoderma edule, Glycymeris glycymeris, Lanice conchilega, Macoma balthica, Paphia rhomboides, Sabellaria alveolata, Spisula ovalis). The real distribution for each species was taken into account into the computational grid and individual filtration rates were imposed. For cultivated and invasive species, which represented the highest density levels, bio-deposition production was also computed in order to evaluate the role of these bio-deposits in re-stimulating chlorophyll levels. From 2008 to 2010, this model will be used by scientists and decision makers as a tool for exploring several scenarios of farming managements and/or environmental factor evolutions and their impacts on the ecosystem.
Jet directions in Seyfert galaxies: Radio continuum imaging data
Creators: name: Schmitt, H. R.
name: Ulvestad, J. S.
name: Antonucci, R. R. J.
name: Kinney, A. L.
Publisher: name: arXiv
Year: 2000
Subjects: subject: Astrophysics (astro-ph)
subject: FOS: Physical sciences

description: We present the results of VLA A-array 8.46 GHz continuum imaging of 55 Seyfert galaxies (19 Seyfert 1's and 36 Seyfert 2's). These galaxies are part of a larger sample of 88 Seyfert galaxies, selected from mostly isotropic properties, the flux at 60 mum and warm infrared 25 mum to 60 mum colors. These images are used to study the structure of the radio continuum emission of these galaxies and their position angles, in the case of extended sources. These data, combined with information from broad-band B and I observations, have been used to study the orientation of radio jets relative to the plane of their host galaxies (Kinney et al. 2000).
description: To appear in The Astrophysical Journal Supplement Series, February 2001, 14 pages, 1 figure (6 pages), 2 tables
title: ADCO, Cart. 186 (11 H 71), f. 0270r
Creators: name: de la Côte d'Or, Archives départementales
name: Archives Départementales De La Côte-D'Or
name: Petot, Frédérique
name: Projet CBMA
name: CBMA/CG21/F.PETOT/2012
name: Petot, Frédéric
Publisher: name: NAKALA - https://nakala.fr (Huma-Num - CNRS)
publisherIdentifier: https://ror.org/04ces3204
publisherIdentifierScheme: ROR
Year: 2020
Subjects: subject: Corpus Burgundiae Medii Aevi
subject: Chartes de la Bourgogne du Moyen Âge
subject: cartulaire
subject: LaMOP
subject: Laboratoire de Médiévistique Occidentale de Paris

description: Cartulaire général de Cîteaux, dit de Jean de Cirey, t. II (XVe siècle), tome II, Archives départementales de la Côte-d'Or, C
art. 186 (11 H 71). Numérisation en mode image.
description: Relation: http://www.cbma-project.eu/
description: Bibliographic citation: Cartulaire général de Cîteaux, dit de Jean de Cirey, t. II (XVe siècle), tome II, Archives départementales de la
 Côte-d'Or, Cart. 186 (11 H 71), f. 0270r, in Projet CBMA - Corpus Burgundiae Medii Aevi [Ressource en ligne], https://manuscrits.cbma-
project.eu/
description: Provenance: https://www.geonames.org/3024876
description: Provenance: http://www.idref.fr/030974844/id
description: Provenance: https://catalogue.bnf.fr/ark:/12148/cb12228351v
description: Provenance: abbaye de Cîteaux
description: Provenance: http://www.wikidata.org/entity/Q843261
HI properties and star formation history of a fly-by pair of blue compact dwarf galaxies
Creators: name: Kim, Jinhyub
name: Chung, Aeree
name: Wong, O. Ivy
name: Lee, Bumhyun
name: Sung, Eon-Chang
name: Staveley-Smith, Lister
Publisher: name: arXiv
Year: 2017
Subjects: subject: Astrophysics of Galaxies (astro-ph.GA)
subject: FOS: Physical sciences

description: A fly-by interaction has been suggested to be one of the major explanations for enhanced star formation in blue compact dwarf (BCD) galaxies, yet no direct evidence for this scenario has been found to date. In the HI Parkes all-sky survey (HIPASS), ESO 435-IG 020 and ESO 435- G 016, a BCD pair were found in a common, extended gas envelope of atomic hydrogen, providing an ideal case to test the hypothesis that the starburst in BCDs can be indeed triggered by a fly-by interaction. Using high-resolution data from the Australia Telescope Compact Array (ATCA), we investigated HI properties and the spectral energy distribution (SED) of the BCD pair to study their interaction and star formation histories. The high-resolution HI data of both BCDs reveal a number of peculiarities, which are suggestive of tidal perturbation. Meanwhile, 40% of the HIPASS flux is not accounted for in the ATCA observations with no HI gas bridge found between the two BCDs. Intriguingly, in the residual of the HIPASS and the ATCA data, 10% of the missing flux appears to be located between the two BCDs. While the SED-based age of the most dominant young stellar population is old enough to have originated from the interaction with any neighbors (including the other of the two BCDs), the most recent star formation activity traced by strong H$α$ emission in ESO 435-IG 020 and the shear motion of gas in ESO 435- G 016, suggest a more recent or current tidal interaction. Based on these and the residual emission between the HIPASS and the ATCA data, we propose an interaction between the two BCDs as the origin of their recently enhanced star formation activity. The shear motion on the gas disk, potentially with re-accretion of the stripped gas, could be responsible for the active star formation in this BCD pair.
description: 10 pages, 8 figures, 3 tables, accepted for publication in A&A
A Magnetic Resonance Force Microscopy Quantum Computer with Tellurium Donors in Silicon
Creators: name: Berman, G. P.
name: Doolen, G. D.
name: Tsifrinovich, V. I.
Publisher: name: arXiv
Year: 2000
Subjects: subject: Quantum Physics (quant-ph)
subject: FOS: Physical sciences

description: We propose a magnetic resonance force microscopy (MRFM)-based nuclear spin quantum computer using tellurium impurities in silicon. This approach to quantum computing combines the well-developed silicon technology with expected advances in MRFM.
description: 9 pages, 1 figure
Criteria for LCA assessment of soil N2O emissions in agricultural systems
Creators: name: Goglio, Pietro
Publisher: name: Zenodo
Year: 2023

description: This file provides a description the general and  criteria adopted in the paper "Evaluating Life Cycle Assessment methodologies to estimate soil nitrous oxide emissions in crop-livestock system assessment" for the assessment of soil N2O LCA methods.  The selection and description of the criteria is part of the publication authored by Goglio et al., (2023).
Supplementary Tables from Dietary and developmental shifts in butterfly-associated bacterial communities
Creators: name: Phalnikar, Kruttika
name: Krushnamegh Kunte
name: Agashe, Deepa
Publisher: name: The Royal Society
Year: 2018
Subjects: subject: Ecology
subject: FOS: Biological sciences

description: Bacterial communities associated with insects can substantially influence host ecology, evolution and behaviour. Host diet is a key factor that shapes bacterial communities, but the impact of dietary transitions across insect development is poorly understood. We analysed bacterial communities of 12 butterfly species across different development stages, using amplicon sequencing of the 16S rRNA gene. Butterfly larvae typically consume leaves of a single host plant, whereas adults are more generalist nectar feeders. Thus, we expected bacterial communities to vary substantially across butterfly development. Surprisingly, only few species showed significant dietary and developmental transitions in bacterial communities, suggesting weak impacts of dietary transitions across butterfly development. On the other hand, bacterial communities were strongly influenced by butterfly species and family identity, potentially due to dietary and physiological variation across the host phylogeny. Larvae of most butterfly species largely mirrored bacterial community composition of their diets, suggesting passive acquisition rather than active selection. Overall, our results suggest that although butterflies harbour distinct microbiomes across taxonomic groups and dietary guilds, the dramatic dietary shifts that occur during development do not impose strong selection to maintain distinct bacterial communities across all butterfly hosts.
title: ADCO, Cartulaire de Cîteaux pour la grange et seigneurie d'Ouges (XVe siècle), Cart. 173 (11 H 939), 226 folios, f. 0002
Creators: name: de la Côte d'Or, Archives départementales
name: Archives Départementales De La Côte-D'Or
name: Petot, Frédérique
name: Projet CBMA
name: CG21/F.PETOT/2015
Publisher: name: NAKALA - https://nakala.fr (Huma-Num - CNRS)
publisherIdentifier: https://ror.org/04ces3204
publisherIdentifierScheme: ROR
Year: 2020
Subjects: subject: LaMOP
subject: Laboratoire de Médiévistique Occidentale de Paris
subject: Corpus Burgundiae Medii Aevi
subject: Chartes de la Bourgogne du Moyen Âge
subject: cartulaire

description: Cartulaire de Cîteaux pour la grange et seigneurie d'Ouges (XVe siècle), Archives départementales de la Côte-d'Or, Cart. 173 (11 H 939), 226 folios, f. 0002, Numérisation en mode image.
description: Relation: http://www.cbma-project.eu/
description: Bibliographic citation: Cartulaire de Cîteaux pour la grange et seigneurie d'Ouges (XVe siècle), Archives départementales de la Côte-d'Or, Cart. 173 (11 H 939), 226 folios, f. 0002, in Projet CBMA - Corpus Burgundiae Medii Aevi [Ressource en ligne], https:// manuscrits.cbma-project.eu/
description: Provenance: abbaye de Cîteaux
description: Provenance: http://www.wikidata.org/entity/Q843261
description: Provenance: https://www.geonames.org/3024876
description: Provenance: http://www.idref.fr/030974844/id
description: Provenance: https://catalogue.bnf.fr/ark:/12148/cb12228351v
Brane-anti-brane Democracy
Creators: name: Kallosh, Renata
name: Rajaraman, Arvind
Publisher: name: arXiv
Year: 1996
Subjects: subject: High Energy Physics - Theory (hep-th)
subject: FOS: Physical sciences

description: We suggest a duality invariant formula for the entropy and temperature of non-extreme black holes in supersymmetric string theory. The entropy is given in terms of the duality invariant parameter of the deviation from extremality and 56 SU(8) covariant central charges. It interpolates between the entropies of Schwarzschild solution and extremal solutions with various amount of unbroken supersymmetries and therefore serves for classification of black holes in supersymmetric string theories. We introduce the second auxiliary 56 via E(7) symmetric constraint. The symmetric and antisymmetric combinations of these two multiplets are related via moduli to the corresponding two fundamental representations of E(7): brane and anti-brane "numbers." Using the CPT as well as C symmetry of the entropy formula and duality one can explain the mysterious simplicity of the non-extreme black hole area formula in terms of branes and anti-branes.
description: LaTeX, 12 pages, no figures
Supplementary Methods from Dietary and developmental shifts in butterfly-associated bacterial communities
Creators: name: Phalnikar, Kruttika
name: Krushnamegh Kunte
name: Agashe, Deepa
Publisher: name: The Royal Society
Year: 2018
Subjects: subject: Ecology
subject: FOS: Biological sciences

description: Bacterial communities associated with insects can substantially influence host ecology, evolution and behaviour. Host diet is a key factor that shapes bacterial communities, but the impact of dietary transitions across insect development is poorly understood. We analysed bacterial communities of 12 butterfly species across different development stages, using amplicon sequencing of the 16S rRNA gene. Butterfly larvae typically consume leaves of a single host plant, whereas adults are more generalist nectar feeders. Thus, we expected bacterial communities to vary substantially across butterfly development. Surprisingly, only few species showed significant dietary and developmental transitions in bacterial communities, suggesting weak impacts of dietary transitions across butterfly development. On the other hand, bacterial communities were strongly influenced by butterfly species and family identity, potentially due to dietary and physiological variation across the host phylogeny. Larvae of most butterfly species largely mirrored bacterial community composition of their diets, suggesting passive acquisition rather than active selection. Overall, our results suggest that although butterflies harbour distinct microbiomes across taxonomic groups and dietary guilds, the dramatic dietary shifts that occur during development do not impose strong selection to maintain distinct bacterial communities across all butterfly hosts.
Eternal and Evanescent Black Holes: It's All Done With Mirrors
Creators: name: Good, Michael R. R.
name: Linder, Eric V.
Publisher: name: arXiv
Year: 2017
Subjects: subject: General Relativity and Quantum Cosmology (gr-qc)
subject: FOS: Physical sciences

description: The analogy between black hole radiation and accelerating mirror radiation (the dynamical Casimir effect) is particularly strong for mirror trajectories giving rise to a constant thermal flux of particles. We present new ways to achieve such thermal plateaus, and customize their finite, semi-infinite, and eternal presence, corresponding to forming/collapsing, complete-evaporation/remnants, and eternal black holes. We find simple expressions for the energy flux in terms of the mirror rapidity as a function of proper time and null time.
description: 13 pages, 11 figures
Dynamics of Nonlocality for A Two-Mode Squeezed State in Thermal Environment
Creators: name: Jeong, Hyunseok
name: Lee, Jinhyoung
name: Kim, M. S.
Publisher: name: arXiv
Year: 2000
Subjects: subject: Quantum Physics (quant-ph)
subject: FOS: Physical sciences

description: We investigate the time evolution of nonlocality for a two-mode squeezed state in the thermal environment. The initial two-mode pure squeezed state is nonlocal with a stronger nonlocality for a larger degree of squeezing. It is found that the larger the degree of initial squeezing is, the more rapidly the squeezed state loses its nonlocality. We explain this by the rapid destruction of quantum coherence for the strongly squeezed state.
description: 5 pages, 3 figures, accepted to PRA
Supplementary Figures from Dietary and developmental shifts in butterfly-associated bacterial communities
Creators: name: Phalnikar, Kruttika
name: Krushnamegh Kunte
name: Agashe, Deepa
Publisher: name: The Royal Society
Year: 2018
Subjects: subject: Ecology
subject: FOS: Biological sciences

description: Bacterial communities associated with insects can substantially influence host ecology, evolution and behaviour. Host diet is a key factor that shapes bacterial communities, but the impact of dietary transitions across insect development is poorly understood. We analysed bacterial communities of 12 butterfly species across different development stages, using amplicon sequencing of the 16S rRNA gene. Butterfly larvae typically consume leaves of a single host plant, whereas adults are more generalist nectar feeders. Thus, we expected bacterial communities to vary substantially across butterfly development. Surprisingly, only few species showed significant dietary and developmental transitions in bacterial communities, suggesting weak impacts of dietary transitions across butterfly development. On the other hand, bacterial communities were strongly influenced by butterfly species and family identity, potentially due to dietary and physiological variation across the host phylogeny. Larvae of most butterfly species largely mirrored bacterial community composition of their diets, suggesting passive acquisition rather than active selection. Overall, our results suggest that although butterflies harbour distinct microbiomes across taxonomic groups and dietary guilds, the dramatic dietary shifts that occur during development do not impose strong selection to maintain distinct bacterial communities across all butterfly hosts.
title: The Eastern Baltic cod stock in the 20th century: Resolving impacts of fishing, human-induced trophic changes and climate
Creators: name: Eero, Margit
name: MacKenzie, Brian R.
name: Köster, Friedrich W.
name: Gislason, Henrik
Publisher: name: ASC 2008 - Theme session J
Year: 2024
Subjects: Baltic Sea (ICES Ecoregion)
Oceanic Northeast Atlantic (ICES Ecoregion)
Ecosystem observation, processes and dynamics

description: No abstracts are to be cited without prior reference to the author.Because of long time-series of data and large contrasts in the stock size and in forcing factors, cod (Gadus morhua) in the Baltic Sea provides a unique opportunity to investigate the relative impacts of top-down and bottom-up forces on a decadal-scale dynamics of a predator fish population in a large marine ecosystem. We show how various human activities interacted with a cod population and demonstrate that a combination of both top-down and bottom-up processes have determined the dynamics of the eastern Baltic cod stock in the 20th century.
title: In situ determination of the impact of press and pulse disturbances on spatial variability of a St. Lawrence rocky intertidal ecosystem assemblages
Creators: name: Séguin, Annie
name: Archambault, Philippe
Publisher: name: ASC 2008 - Theme session J
Year: 2024
Subjects: Baltic Sea (ICES Ecoregion)
Oceanic Northeast Atlantic (ICES Ecoregion)
Ecosystem observation, processes and dynamics

description: No abstracts are to be cited without prior reference to the author.The aim of this study is to determine in situthe impact of press and pulse disturbances on spatio-temporal variability of biodiversity. More precisely, we will precise the Caswell and Cohen’s model.
title: Trust and check. An individual approach to small-scale fishery sampling from the Polish brackish lagoons (Southern Baltic)
Creators: name: Psuty, Iwona
Publisher: name: ASC 2008 - Theme session K
Year: 2024
Subjects: Fisheries and aquaculture
Pressures, impacts, conservation, and management

description: No abstracts are to be cited without prior reference to the author.Sampling small-scale and scattered fishery is difficult to achieve with limited resources. While self-sampling is a cost-effective method, it is highly dependent on human factors. Experience from the Vistula and Szczecin lagoons (southern Baltic) indicated the utility of length self-sampling done by fishermen. It occurred that correct samples were dependent on using the correct terms, among which the very concept of “scientific measurement” was understood differently by scientists and fishermen. The success of the selfreporting program for catch composition was strongly linked to the history of cooperation with each of the participating fishermen. The main human factor issues revealed by the study were the possibilities of the participants retaining anonymity and reporting only a portion of the actual catches. The best solution for eradicating misleading factors was to implement a partial self-reporting program for catch composition, with an additional effort to directly estimate fyke-net numbers and indirectly estimate gill-net numbers. Other positive results have been achieved using methods in which fishermen were offered financial incentives to conduct research. In this case, the high quality long-term data series provoked conflict with a segment of the local community.
Solving variational problems and partial differential equations that map between manifolds via the closest point method
Creators: name: King, Nathan D.
name: Ruuth, Steven J.
Publisher: name: arXiv
Year: 2017
Subjects: subject: Numerical Analysis (math.NA)
subject: FOS: Mathematics

description: Maps from a source manifold $ {\mathcal M}$ to a target manifold ${\mathcal N}$ appear in liquid crystals, colour image enhancement, texture mapping, brain mapping, and many other areas. A numerical framework to solve variational problems and partial differential equations (PDEs) that map between manifolds is introduced within this paper. Our approach, the closest point method for manifold mapping, reduces the problem of solving a constrained PDE between manifolds ${\mathcal M}$ and ${\mathcal N}$ to the simpler problems of solving a PDE on ${\mathcal M}$ and projecting to the closest points on ${\mathcal N}.$ In our approach, an embedding PDE is formulated in the embedding space using closest point representations of ${\mathcal M}$ and ${\mathcal N}.$ This enables the use of standard Cartesian numerics for general manifolds that are open or closed, with or without orientation, and of any codimension. An algorithm is presented for the important example of harmonic maps and generalized to a broader class of PDEs, which includes $p$-harmonic maps. Improved efficiency and robustness are observed in convergence studies relative to the level set embedding methods. Harmonic and $p$-harmonic maps are computed for a variety of numerical examples. In these examples, we denoise texture maps, diffuse random maps between general manifolds, and enhance colour images.
description: 19 pages, 6 figures
Transfer of nonclassical features in quantum teleportation via a mixed quantum channel
Creators: name: Lee, Jinhyoung
name: Kim, M. S.
name: Jeong, Hyunseok
Publisher: name: arXiv
Year: 2000
Subjects: subject: Quantum Physics (quant-ph)
subject: FOS: Physical sciences

description: Quantum teleportation of a continuous-variable state is studied for the quantum channel of a two-mode squeezed vacuum influenced by a thermal environment. Each mode of the squeezed vacuum is assumed to undergo the same thermal influence. It is found that when the mixed two-mode squeezed vacuum for the quantum channel is separable, any nonclassical features, which may be imposed in an original unknown state, cannot be transferred to a receiving station. A two-mode Gaussian state, one of which is a mixed two-mode squeezed vacuum, is separable if and only if a positive well-defined $P$ function can be assigned to it. The fidelity of teleportation is considered in terms of the noise factor given by the imperfect channel. It is found that quantum teleportation may give more noise than direct transmission of a field under the thermal environment, which is due to the fragile nature of quantum entanglement of the quantum channel.
description: 8 pages
MPEC 2025-D256 : 2025 DT24
Creators: name: Minor Planet Center Staff
Publisher: name: The Minor Planet Center
Year: 2025
Subjects: subject: Small Solar System bodies
valueUri: http://astrothesaurus.org/uat/1469
subject: 2025 DT24

description: The Minor Planet Electronic Circulars contain information on unusual minor planets, routine data on comets and natural satellites, and occasional editorial announcements.  They are published on behalf of Division F of the International Astronomical Union by the Minor Planet Center, Smithsonian Astrophysical Observatory, Cambridge, MA 02138, U.S.A.
The radiative decay $D^0 \to \bar{K}^{*0} γ$ with vector meson dominance
Creators: name: Dias, J. M.
name: Debastiani, V. R.
name: Xie, Ju-Jun
name: Oset, E.
Publisher: name: arXiv
Year: 2017
Subjects: subject: High Energy Physics - Phenomenology (hep-ph)
subject: FOS: Physical sciences

description: Motivated by the experimental measurements of $D^0$ radiative decay modes we have proposed a model to study the $D^0\to \bar{K}^{*0}γ$ decay, by establishing a link with $D^0\to \bar{K}^{*0}V$ $(V=ρ^0,\, ω)$ decays through the vector meson dominance hypothesis. In order to do this properly, we have used the Lagrangians from the local hidden gauge symmetry approach to account for $Vγ$ conversion. As a result, we have found the branching ratio $\mathcal{B}[D^0\to \bar{K}^{*0}γ] =(1.55 - 3.44)\times 10^{-4}$, which is in fair agreement with the experimental values reported by Belle and Babar collaborations.
description: 14 pages and 3 figures
Greenstone: uso atual na Argentina
Creators: name: Fushimi, Marcela
name: Pichinini, Mariana
name: Sanllorenti, Ana María
name: Williman, Martín
Publisher: name: figshare
Year: 2018
Subjects: subject: 80706 Librarianship
subject: FOS: Media and communications
subject: Library and Information Studies

description: Este trabajo presenta las características e historia del software para crear y gestionar bibliotecas digitales Greenstone, desarrollado inicialmente por la Universidad de Waikato, Nueva Zelandia en 1997. En primer lugar, se describe la comunidad de usuarios a nivel global, focalizando en el uso actual que el software ha alcanzado en Argentina: la cantidad de implementaciones disponibles, su evolución, el tipo, tamaño y variedad de los desarrollos existentes, así como su aplicación a la gestión de repositorios digitales de ciencia y tecnología en el ámbito de las instituciones científicas, tecnológicas y de educación superior en Argentina. En segundo lugar, se detallan las acciones llevadas a cabo a partir de la creación del Centro Nacional de Promoción de Greenstone en Argentina en 2009. Datos recabados en encuestas realizadas permitieron observar que las razones predominantes para elegir esta plataforma fueron, entre otras, su facilidad de instalación y configuración, su bajo nivel de requerimiento tecnológico, la generalizada escasez de recursos humanos dedicados a esta actividad, y la complejidad que presentaban los softwares alternativos existentes en ese momento. A lo largo de estos 8 años, tanto los repositorios digitales como los sistemas que los soportan evolucionaron drásticamente, modificando el escenario actual. Paralelamente, en 2016 la nueva versión mayor de Greenstone implementó una reingeniería completa del software para su adaptación a las tecnologías en uso: XML, XSLT, Web-services y Java. Como consecuencia de esto, la comunidad de desarrollo local se plantea nuevos desafíos para la migración de las bibliotecas digitales y repositorios implementados con versiones anteriores.
Universal aspects of string propagation on curved backgrounds
Creators: name: Bakas, I.
name: Sfetsos, K.
Publisher: name: arXiv
Year: 1996
Subjects: subject: High Energy Physics - Theory (hep-th)
subject: FOS: Physical sciences

description: String propagation on D-dimensional curved backgrounds with Lorentzian signature is formulated as a geometrical problem of embedding surfaces. When the spatial part of the background corresponds to a general WZW model for a compact group, the classical dynamics of the physical degrees of freedom is governed by the coset conformal field theory SO(D-1)/SO(D-2), which is universal irrespective of the particular WZW model. The same holds for string propagation on D-dimensional flat space. The integration of the corresponding Gauss-Codazzi equations requires the introduction of (non-Abelian) parafermions in differential geometry.
description: 15 pages, latex. Typo in Eq. (2.12) is corrected. Version to be published in Phys. Rev. D
Instability in dynamic fracture and the failure of the classical theory of cracks
Creators: name: Chen, Chih-Hung
name: Bouchbinder, Eran
name: Karma, Alain
Publisher: name: arXiv
Year: 2017
Subjects: subject: Soft Condensed Matter (cond-mat.soft)
subject: Materials Science (cond-mat.mtrl-sci)
subject: FOS: Physical sciences

description: Cracks, the major vehicle for material failure, tend to accelerate to high velocities in brittle materials. In three-dimensions, cracks generically undergo a micro-branching instability at about 40% of their sonic limiting velocity. Recent experiments showed that in sufficiently thin systems cracks unprecedentedly accelerate to nearly their limiting velocity without micro-branching, until they undergo an oscillatory instability. Despite their fundamental importance and apparent similarities to other instabilities in condensed-matter physics and materials science, these dynamic fracture instabilities remain poorly understood. They are not described by the classical theory of cracks, which assumes that linear elasticity is valid inside a stressed material and uses an extraneous local symmetry criterion to predict crack paths. Here we develop a model of two-dimensional dynamic brittle fracture capable of predicting arbitrary paths of ultra-high-speed cracks in the presence of elastic nonlinearity without extraneous criteria. We show, by extensive computations, that cracks undergo a dynamic oscillatory instability controlled by small-scale elastic nonlinearity near the crack tip. This instability occurs above a ultra-high critical velocity and features an intrinsic wavelength that increases proportionally to the ratio of the fracture energy to an elastic modulus, in quantitative agreement with experiments. This ratio emerges as a fundamental scaling length assumed to play no role in the classical theory of cracks, but shown here to strongly influence crack dynamics. Those results pave the way for resolving other long-standing puzzles in the failure of materials.
title: The influence of the Earth's magnetic field on strapdown inertial gravimetry using Q-Flex accelerometers: static and dynamic experiments
Creators: name: Johann, Felix
name: Becker, David
name: Becker, Matthias
name: Hoss, Matthias
name: Löwer, Alexander
name: Förste, Christoph
Publisher: name: Springer
Year: 2024

description: In recent strapdown airborne and shipborne gravimetry campaigns with servo accelerometers of the widely used Q-Flex type, results have been impaired by heading-dependent measurement errors. This paper shows that the effect is, in all likelihood, caused by the sensitivity of the Q-Flex type sensor to the Earth’s magnetic field. In order to assess the influence of magnetic fields on the utilised strapdown IMU of the type iMAR iNAV-RQH-1003, the IMU has been exposed to various magnetic fields of known directions and intensities in a 3-D Helmholtz coil. Based on the results, a calibration function for the vertical accelerometer is developed. At the example of five shipborne and airborne campaigns, it is outlined that under specific circumstances the precision of the gravimetry results can be strongly improved using the magnetic calibration approach: The non-adjusted RMSE at repeated lines decreased from 1.19 to 0.26 mGal at a shipborne campaign at Lake Müritz, Germany. To the knowledge of the authors, a significant influence of the Earth’s magnetic field on strapdown inertial gravimetry is demonstrated for the first time.
A Proposed Framework for Exchanging Electronic Waste for Robotics Education Resources in Underserved Communities (2025)
Creators: name: Asare, Kwabena Janix
name: Offe, Mensah Irene
name: Kessewaa, Eugenia Adwoa
Publisher: name: Zenodo
Year: 2025

description: Doi: 10.5281/zenodo.15291210

Abstract

The escalating global generation of electronic waste (e-waste) presents significant environmental and health hazards, particularly in regions lacking robust waste management infrastructure. Concurrently, equitable access to quality Science, Technology, Engineering, and Mathematics (STEM) education is hampered in many communities by resource limitations, restricting opportunities for youth to develop crucial 21st-century skills. This paper proposes a generalized, adaptable framework for a program that directly addresses these intersecting challenges. The model facilitates the exchange of collected household and institutional e-waste for robotics kits, associated training programs, and user manuals within underserved communities. This initiative aims to incentivize responsible e-waste disposal while simultaneously providing tangible tools and skills development for STEM education. This paper outlines the global problem context, reviews pertinent literature on e-waste management and STEM education, details the core components of the proposed exchange model (collection, valuation, resource provision, training), discusses implementation strategies, potential impacts, challenges, and evaluation metrics. By applying circular economy principles, this framework offers a pathway to transform an environmental liability into a valuable educational asset, fostering innovation and technical proficiency among young learners.
Density distribution of the cosmological matter field
Creators: name: Klypin, Anatoly
name: Prada, Francisco
name: Betancort-Rijo, Juan
name: Albareti, Franco D.
Publisher: name: arXiv
Year: 2017
Subjects: subject: Cosmology and Nongalactic Astrophysics (astro-ph.CO)
subject: FOS: Physical sciences

description: The one-point probability distribution function (PDF) of the matter density field in the universe is a fundamental property that plays an essential role in cosmology for estimates such as gravitational weak lensing, non-linear clustering, massive production of mock galaxy catalogs, and testing predictions of cosmological models. Here we make a comprehensive analysis of the dark matter PDF using a suite of 7000 N-body simulations that covers a wide range of numerical and cosmological parameters. We find that the PDF has a simple shape: it declines with density as a power-law P~rho**(-2), which is exponentially suppressed on both small and large densities. The proposed double-exponential approximation provides an accurate fit to all our N-body results for small filtering scales R< 5Mpc/h with rms density fluctuations sigma>1. In combination with the spherical infall model that works well for small fluctuations sigma<1, the PDF is now approximated with just few percent errors over the range of twelve orders of magnitude -- a remarkable example of precision cosmology. We find that at 5-10% level the PDF explicitly depends on redshift (at fixed sigma) and on cosmological density parameter Omega_m. We test different existing analytical approximations and find that the often used log-normal approximation is always 3-5 times less accurate than either the double-exponential approximation or the spherical infall model.
title: Modularity of the displacement coefficients and complete plate theories in the framework of the consistent-approximation approach
Creators: name: Meyer-Coors, Michael
name: Kienzler, Reinhold
name: Schneider, Patrick
Publisher: name: Springer
Year: 2024

description: Starting from the three-dimensional theory of linear elasticity, we arrive at the exact plate problem by the use of Taylor series expansions. Applying the consistent-approximation approach to this problem leads to hierarchic generic plate theories. Mathematically, these plate theories are systems of partial-differential equations (PDEs), which contain the coefficients of the series expansions of the displacements (displacement coefficients) as variables. With the pseudo-reduction method, the PDE systems can be reduced to one main PDE, which is entirely written in the main variable, and several reduction PDEs, each written in the main variable and several non-main variables. So, after solving the main PDE, the reduction PDEs can be solved by insertion of the main variable. As a great disadvantage of the generic plate theories, there are fewer reduction PDEs than non-main variables so that not all of the latter can be determined independently. Within this paper, a modular structure of the displacement coefficients is found and proved. Based on it, we define so-called complete plate theories which enable us to determine all non-main variables independently. Also, a scheme to assemble Nth-order complete plate theories with equations from the generic plate theories is found. As it turns out, the governing PDEs from the complete plate theories fulfill the local boundary conditions and the local form of the equilibrium equations a priori. Furthermore, these results are compared with those of the classical theories and recently published papers on the consistent-approximation approach.
Proposta de criação de uma rede de dados abertos da pesquisa brasileira
Creators: name: Pavão, Caterina Groposo
name: Rocha, Rafael Porte Da
name: Junior, Rene Faustino Gabriel
Publisher: name: figshare
Year: 2018
Subjects: subject: 80706 Librarianship
subject: FOS: Media and communications
subject: Library and Information Studies

description: Aborda os dados de pesquisa resultantes de investigações realizadas em instituições de ensino e pesquisa brasileiras e a necessidade de torná-los públicos, por meio do acesso aberto em repositórios, a fim de validar os resultados obtidos e publicados, como também para impulsionar novas pesquisas e socializar o conhecimento. Tem como objetivo explorar o cenário nacional e internacional e apresentar o planejamento de uma investigação que busca uma solução tecnológica para efetivar o acesso aberto a dados de pesquisa (AADP) dentro de uma perspectiva nacional. Propõe uma metodologia dividida em cinco etapas: identificação de práticas de AADP em instituições brasileiras; mapeamento dos usuários de AADP e suas necessidades; proposta de um portal web para reunir a comunidade nacional em AADP; levantamento dos serviços e soluções tecnológicas para o compartilhamento de dados de pesquisa existentes no cenário internacional; proposição de recomendações para o apoio a criação de repositórios de dados de pesquisa em instituições nacionais e a suaagregação a uma rede de pesquisa em AADP. Como resultado, traz iniciativas e estratégias internacionais paralevar a cabo a criação de repositórios de dados de pesquisa, assim como para criar comunidades de práticas em torno do assunto. Recomenda que a proposta seja constituída de três vertentes, a fim de apoiar a criação derepositórios de dados de pesquisa em instituições nacionais e a sua agregação a uma rede de pesquisa em AADP.
Tackling information asymmetry in networks: a new entropy-based ranking index
Creators: name: Barucca, Paolo
name: Caldarelli, Guido
name: Squartini, Tiziano
Publisher: name: arXiv
Year: 2017
Subjects: subject: Social and Information Networks (cs.SI)
subject: Physics and Society (physics.soc-ph)
subject: FOS: Computer and information sciences
subject: FOS: Physical sciences

description: Information is a valuable asset for agents in socio-economic systems, a significant part of the information being entailed into the very network of connections between agents. The different interlinkages patterns that agents establish may, in fact, lead to asymmetries in the knowledge of the network structure; since this entails a different ability of quantifying relevant systemic properties (e.g. the risk of financial contagion in a network of liabilities), agents capable of providing a better estimate of (otherwise) unaccessible network properties, ultimately have a competitive advantage. In this paper, we address for the first time the issue of quantifying the information asymmetry arising from the network topology. To this aim, we define a novel index - InfoRank - intended to measure the quality of the information possessed by each node, computing the Shannon entropy of the ensemble conditioned on the node-specific information. Further, we test the performance of our novel ranking procedure in terms of the reconstruction accuracy of the (unaccessible) network structure and show that it outperforms other popular centrality measures in identifying the "most informative" nodes. Finally, we discuss the socio-economic implications of network information asymmetry.
description: 12 pages, 8 figures
Capacity Results for Block-Stationary Gaussian Fading Channels with a Peak Power Constraint
Creators: name: Chen, Jun
name: Veeravalli, Venugopal V.
Publisher: name: arXiv
Year: 2006
Subjects: subject: Information Theory (cs.IT)
subject: FOS: Computer and information sciences

description: We consider a peak-power-limited single-antenna block-stationary Gaussian fading channel where neither the transmitter nor the receiver knows the channel state information, but both know the channel statistics. This model subsumes most previously studied Gaussian fading models. We first compute the asymptotic channel capacity in the high SNR regime and show that the behavior of channel capacity depends critically on the channel model. For the special case where the fading process is symbol-by-symbol stationary, we also reveal a fundamental interplay between the codeword length, communication rate, and decoding error probability. Specifically, we show that the codeword length must scale with SNR in order to guarantee that the communication rate can grow logarithmically with SNR with bounded decoding error probability, and we find a necessary condition for the growth rate of the codeword length. We also derive an expression for the capacity per unit energy. Furthermore, we show that the capacity per unit energy is achievable using temporal ON-OFF signaling with optimally allocated ON symbols, where the optimal ON-symbol allocation scheme may depend on the peak power constraint.
description: Submitted to the IEEE Transactions on Information Theory