cometadata/datacite-rtg-text-other-reclassification-records huggingface dataset:
The Visual Orbit of iota Pegasi
Creators: name: Boden, A. F.
name: Koresko, C. D.
Publisher: name: arXiv
Year: 1998
Subjects: subject: Astrophysics (astro-ph)
subject: FOS: Physical sciences

description: We have determined the visual orbit for the spectroscopic binary iota~Pegasi with interferometric visibility data obtained by the Palomar Testbed Interferometer in 1997. iota~Pegasi is a double-lined binary system whose minimum masses and spectral typing suggests the possibility of eclipses. Our orbital and component diameter determinations do not favor the eclipse hypothesis: the limb-to-limb separation of the two components is 0.151 +/- 0.069 mas at conjunction. Our conclusion that the iota~Peg system does not eclipse is supported by high-precision photometric observations. The physical parameters implied by our visual orbit and the spectroscopic orbit of Fekel and Tomkin (1983) are in good agreement with those inferred by other means. In particular, the orbital parallax of the system is determined to be 86.9 +/- 1.0 mas, and masses of the two components are determined to be 1.326 +/- 0.016 M_sun and 0.819 +/- 0.009 M_sun respectively.
description: ApJ in press. 23 pages, 4 figures & 3-page data table
Eigenvalue estimates for bilayer graphene
Creators: name: Cuenin, Jean-Claude
Publisher: name: arXiv
Year: 2018
Subjects: subject: Spectral Theory (math.SP)
subject: Mathematical Physics (math-ph)
subject: FOS: Mathematics
subject: FOS: Physical sciences

description: Recently, Ferrulli-Laptev-Safronov (2016arXiv161205304F) obtained eigenvalue estimates for an operator associated to bilayer graphene in terms of $L^q$ norms of the (possibly non-selfadjoint) potential. They proved that for $1
description: 14 pages, 1 figure, typo in formula for D_{\rm trig} corrected
title: ADCO, Cartulaire de Cîteaux pour les possessions de Tontenant (c. 1504), Cart. 184 (11 H 987), 105 folios, f. 0214
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 les possessions de Tontenant (c. 1504), Archives départementales de la Côte-d'Or, Cart. 184 (11 H 987), 105 folios, f. 0214, Numérisation en mode image.
description: Relation: http://www.cbma-project.eu/
description: Bibliographic citation: Cartulaire de Cîteaux pour les possessions de Tontenant (c. 1504), Archives départementales de la Côte-d'Or, Cart. 184 (11 H 987), 105 folios, f. 0214, 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
Residential roof-top solar PV systems: techno-economic feasibility and enviro-economic impacts
Creators: name: Al-Saqlawi, Juman
Publisher: name: Imperial College London
Year: 2017

description: The residential sector represents 27% of global energy consumption and 17% of global CO2 emissions. Scaling up what we already know how to do through the use of solar PV technologies could decarbonise electricity demand and play a considerable role in mitigating climate change. Therefore, the overall objective of this thesis is to develop a novel step by step approach in order to assess the potential of implementing roof-top solar PV/battery technologies, defined as grid-independent systems, that target the complete decarbonisation of electricity demand per household. The approach adopted was to use Oman as a primary case study and Mexico as a secondary case study in order to determine the characteristics of the solar panel and the battery facility required to provide grid-independence. This was then compared to a similar grid-connected system and any techno-economic targets necessary to enhance the feasibility of residential roof-top PV systems were identified. Such an analysis was achieved through developing a detailed techno-economic mathematical model describing four sub-systems; the solar panel DC source, the grid-independent sub-system, the grid-connected sub-system and the economic sub-system. The model was implemented in gPROMS and uses real hourly weather and climate conditions matched with real demand data, over a simulated period of 20 years. Following the techno-economic assessment, an enviro-economic analysis was applied to the main case study, Oman, where the wider impacts of residential roof-top PV systems on the economy and the environment were assessed through quantifying any financial benefits, avoided CO2 emissions and net jobs created. The results indicate that, in the context of the systems studied, grid-independent PV systems are not feasible. However, combined with a high enough electricity price, grid-independent systems can become economically feasible with significant reductions in battery costs (>90% reductions). This can only be achieved through further research and innovation in battery technologies. Comparatively, with the appropriate electricity prices, PV costs and policies, grid-connected systems were identified to have great potential in countries that are characterised with high solar irradiance such as Oman and Mexico. In terms of enviro-economic benefits, residential roof- top PV systems were found to have the potential to significantly reduce overall CO2 emissions and result in notable economic benefits to a specific country. However, this is dependent on the country under consideration. Finally, it was recommended that in order to achieve more accurate net job creation estimations from renewable systems, country specific models should be developed since current analytical models are characterised with great uncertainty.
Performance analysis of photodetectors based on 2D materials and heterostructures
Creators: name: Nandihalli, Nagaraj
Publisher: name: arXiv
Year: 2024
Subjects: subject: Applied Physics (physics.app-ph)
subject: FOS: Physical sciences

description: The unprecedented demand for sophisticated, self-powered, compact, ultrafast, cost-effective, and broadband light sensors for a myriad of applications has spurred a lot of research, precipitating in a slew of studies over the last decade. Apart from the photosensing ability of an active element in the light sensor, the device architecture is crucial in terms of photoinduced charge carrier generation and separation. Since the inception of graphene and the subsequent research growth in the atomically thin 2D materials, researchers have developed and adapted different families of 2D materials and device architectures, including single element 2D, 0D/2D, 2D/2D, 1D/ 2D stacked structures, and so on. This review discusses the recent reports on the light-sensing properties of various 2D materials, their heterostructures, and characteristics applicable to the ultraviolet-near infrared (UV-NIR), short-wave IR (SWIR), mid-wave IR (MWIR), long-wave IR (LWIR), and terahertz (THz) spectral ranges. It highlights the novelty of the burgeoning field, the heightened activity at the boundaries of engineering and materials science, particularly in the generation of charge carriers, their separation, and extraction, and the increased understanding of the underpinning science through modern experimental approaches. Devices based on the simultaneous effects of the pyro-phototronic effect (PPE) and the localized surface plasmon resonance (LSPR) effect, the photothermoelectric effect (PTE)-assisted photodetectors (PDs), waveguide-integrated silicon-2D PDs, metal-2D-metal PDs, and organic material PDs are examined rigorously. Theoretical treatment utilizing various computational approaches to investigate 2D materials and heterostructures for photodetection applications is also briefly discussed.
description: 88 pages
Meleagris cristata Linnaeus, 1758, spec. nov.
Creators: name: Linnaeus, Carolus
Publisher: name: Laurentius Salvius
Year: 1758
Subjects: Biodiversity
Taxonomy
Animalia
Chordata
Aves
Galliformes
Phasianidae
Meleagris
Meleagris cristata

description: Meleagris cristata [spec. nov.]
M. capite pennis erectis cristato, temporibus violaceis.
Quan s. Guan. Edw. av. 13. t. 13.
Jacupema. Marcgr. bras. 198.
Coxolitli. Hern. mex ...
Phasianus brasiliensis. Raj. av. 56.
Habitat in America australi.
Gula caruncula compressa rubra ut in antecedente, capite supra crista oblonga pennacea.
description: Published as part of Linnaeus, Carolus, 1758, Systema Naturae per regna tria naturae: secundum classes, ordines, genera, species, cum characteribus, differentiis, synonymis, locis, Stockholm :Laurentius Salvius on page 157, DOI: 10.5962/bhl.title.542, http://zenodo.org/record/3922206
Membrane fabrication and membrane fouling for low salinity water by reverse osmosis
Creators: name: Jiang, Zhiwei
Publisher: name: Imperial College London
Year: 2016

description: Polyamide nanofilms made at the aqueous-organic interface have been developed for a few decades, yet understanding the formation mechanism and measurement of the active thickness of the nanofilms is still a challenge. To overcome this lack of knowledge, ultrathin and smooth polyamide nanofilms with thickness less than 10nm were made from the controlled interfacial polymerization on a sacrificial layer or at the free interface. The nanofilms were robust and defect free, and could be incorporated into composite membranes and used in reverse osmosis. By controlling the reaction conditions, the nanofilms bent up at the interface to create a crumpled texture, resulting in higher permeable area for water passage. This provides strong evidence that the active thickness of the polyamide nanofilms is one order of magnitude lower than the observed thickness of the undulated structure. The water permeance was further enhanced by solvent activation which provides a structural change in the polymer network to create more free volume for faster water diffusion. The intrinsic water permeability of the nanofilm was studied by manipulating the thickness from ~5 to 16nm while keeping the surface smooth. The absorption and diffusion rate was enhanced for the nanofilms below ~8nm which increased the intrinsic permeability from a constant value to 40% higher. Fouling tests were conducted with a protein as the model foulant for both smooth and rough membranes, for which the observed flux decline was similar. Rather than surface morphology, the initial permeance of the membranes was shown to be the dominating factor influencing the extent of fouling.
Structure and Evolution of Hot Gas in 30 Dor
Creators: name: Wang, Q. Daniel
Publisher: name: arXiv
Year: 1998
Subjects: subject: Astrophysics (astro-ph)
subject: FOS: Physical sciences

description: We have investigated the structure and evolution of hot gas in the 30 Dor nebula, based on recent X-ray observations. Our deep ROSAT HRI image shows that diffuse X-ray emission arises in blister-shaped regions outlined by loops of HII gas. X-ray spectroscopic data from ASCA confirm the thermal nature of the emission and indicate that hot gas temperature decreases from the core to the halo of the nebula. The structure of the nebula can be understood as outflows of hot and HII gases from the parent giant molecular cloud of the central OB association. The dynamic mixing between the two gas phases is likely responsible for the mass loading to the hot gas, as required to explain the observed thermal structure and X-ray luminosity of the nebula. Such processes should also be important in the formation of similar giant HII regions and in their subsequent evolution into supergiant bubbles or galactic chimneys.
description: 9 page text plus 4 color figures. To appear in ApJL
Metal-organic materials for harmful anionic species removal from aqueous solution: investigation, characterization and application
Creators: name: Wang, Chenghong
Publisher: name: Imperial College London
Year: 2017

description: A recently developed class of porous materials, metal-organic frameworks (MOFs), has attracted substantial attention during the last years. In this thesis, the feasibility of water stable MOF materials working as functional adsorbents for contaminated water remediation (especially centered on anionic pollutants removal) was explored and studied. Three stages of research were conducted: firstly – the application of water stable MOF for the highly effective removal of specific anionic species, secondly – resolving the applicability problems of MOF adsorbents, and thirdly – the introduction of a novel concept of using metal-organic nanoclusters for efficient water decontamination. At the end, metal-organic materials were proved to provide a superior performance in the removal of harmful anionic species. The adsorption behaviors and mechanisms were systematically investigated to provide insightful understanding.
Comparing approximate methods for mock catalogues and covariance matrices I: correlation function
Creators: name: Lippich, Martha
name: Sánchez, Ariel G.
name: Colavincenzo, Manuel
name: Sefusatti, Emiliano
name: Monaco, Pierluigi
name: Blot, Linda
name: Crocce, Martin
name: Alvarez, Marcelo A.
name: Agrawal, Aniket
name: Avila, Santiago
name: Balaguera-Antolínez, Andrés
name: Bond, Richard
name: Codis, Sandrine
name: Vecchia, Claudio Dalla
name: Dorta, Antonio
name: Fosalba, Pablo
name: Izard, Albert
name: Kitaura, Francisco-Shu
name: Pellejero-Ibanez, Marcos
name: Stein, George
name: Vakili, Mohammadjavad
name: Yepes, Gustavo
Publisher: name: arXiv
Year: 2018
Subjects: subject: Cosmology and Nongalactic Astrophysics (astro-ph.CO)
subject: FOS: Physical sciences

description: This paper is the first in a set that analyses the covariance matrices of clustering statistics obtained from several approximate methods for gravitational structure formation. We focus here on the covariance matrices of anisotropic two-point correlation function measurements. Our comparison includes seven approximate methods, which can be divided into three categories: predictive methods that follow the evolution of the linear density field deterministically (ICE-COLA, Peak Patch, and Pinocchio), methods that require a calibration with N-body simulations (Patchy and Halogen), and simpler recipes based on assumptions regarding the shape of the probability distribution function (PDF) of density fluctuations (log-normal and Gaussian density fields). We analyse the impact of using covariance estimates obtained from these approximate methods on cosmological analyses of galaxy clustering measurements, using as a reference the covariances inferred from a set of full N-body simulations. We find that all approximate methods can accurately recover the mean parameter values inferred using the N-body covariances. The obtained parameter uncertainties typically agree with the corresponding N-body results within 5% for our lower mass threshold, and 10% for our higher mass threshold. Furthermore, we find that the constraints for some methods can differ by up to 20% depending on whether the halo samples used to define the covariance matrices are defined by matching the mass, number density, or clustering amplitude of the parent N-body samples. The results of our configuration-space analysis indicate that most approximate methods provide similar results, with no single method clearly outperforming the others.
description: 23 pages, 11 figures. Replaced to match accepted MNRAS version. Included Kullback-Leibler divergence
A nuclear grand-design spiral within the normal disc spiral of NGC 5248
Creators: name: Laine, S.
name: Knapen, J. H.
name: Pérez-Ramírez, D.
name: Doyon, R.
name: Nadeau, D.
Publisher: name: arXiv
Year: 1998
Subjects: subject: Astrophysics (astro-ph)
subject: FOS: Physical sciences

description: We report the discovery of trailing grand-design nuclear spiral structure in the spiral galaxy NGC 5248. Two tightly-wound red spiral arms, with widths less than 1 arcsec (~75 pc), emanate at 1 arcsec outside the quiescent nucleus of the galaxy, and can be followed for 3 arcsec, appearing to end before the radius of the circumnuclear starburst "ring", which is at 5--6 arcsec or around 400 parsec. Combining our near-infrared Canada-France-Hawaii Telescope adaptive optics results with traditional near-infrared and optical imaging, we show that spiral structure is present in this galaxy at spatial scales covering two orders of magnitude, from a hundred parsecs to 15 kpc. Comparison with a Hubble Space Telescope ultraviolet image shows how the location of the circumnuclear star formation relates to the nuclear spiral structure. We briefly discuss possible mechanisms which could be responsible for the observed nuclear grand-design spiral structure.
description: 5 pages, Latex. 5 postscript files included. Better quality versions of the figures are available from ftp://star.herts.ac.uk/pub/Laine/ngc5248/ . MNRAS Letters, accepted
Meleagris satyra Linnaeus, 1758, spec. nov.
Creators: name: Linnaeus, Carolus
Publisher: name: Laurentius Salvius
Year: 1758
Subjects: Biodiversity
Taxonomy
Animalia
Chordata
Aves
Galliformes
Phasianidae
Meleagris
Meleagris satyra

description: Meleagris satyra [spec. nov.]
M. capite cornubus duobus, corpore rubro punctis nigris albo foetis. �
Phasianus cornutus. Edw. av. 116. t. 116.
Habitat in Benghala.
Frons nigra. Caruncula gularis caerulea rufo variegata. Cornua duo caerulea pone oculos enata.
description: Published as part of Linnaeus, Carolus, 1758, Systema Naturae per regna tria naturae: secundum classes, ordines, genera, species, cum characteribus, differentiis, synonymis, locis, Stockholm :Laurentius Salvius on page 157, DOI: 10.5962/bhl.title.542, http://zenodo.org/record/3922206
On classical and quantum moduli Spaces of supersymmetric gauge theories
Creators: name: Ferlito, Giulia
Publisher: name: Imperial College London
Year: 2017

description: This manuscript presents some results that concern supersymmetric theories with eight supercharges and moduli spaces of instantons. The latter are attacked from two fronts. Firstly we study the quantum-corrected Coulomb branch of three-dimensional N = 4 quiver theories which are encoded in the over-extended Dynkin diagram of a group G. Studying the ring of gauge invariant operators on the Coulomb branch for these theories by means of a generalised monopole formula yields precisely the Hilbert series for the moduli space of G-instantons. We provide results for any G, including non-simply-laced and exceptional groups. In the second part of the thesis we analyse the Higgs branch of some five-dimensional N = 1 supersymmetric gauge theories. We provide a description of the quantum-corrected Higgs branch in terms of instanton operators, the glueball superfield and mesons. In particular, a classical nilpotent relation is found to be corrected by bilinears in instanton operators. The analysis depends on a decomposition of the Hilbert series for the moduli space of E_{N_f +1} instantons into SO(2Nf) instantons, which are the known Higgs branch at infinite and finite coupling respectively. The dressing of instanton operators in terms of finite coupling fields is also analysed. In passing, we also present an interesting phenomenon where the Higgs branch of a given family of gauge theories with eight supercharges and classical gauge and global symmetry groups is not a single hyperKähler cone but rather the union of two such cones with nontrivial intersection.
Supplemental text and figures from Expression of a novel surfactant protein gene is associated with sites of extrapulmonary respiration in a lungless salamander
Creators: name: Lewis, Zachary R.
name: Dorantes, Jorge A.
name: Hanken, James
Publisher: name: The Royal Society
Year: 2018
Subjects: subject: Physiology
subject: FOS: Biological sciences
subject: Evolutionary Biology

description: Supporting tables, figures, text and references.
Stellar Absorption Lines in the Spectra of Seyfert Galaxies
Creators: name: Nelson, Charles
name: Whittle, Mark
Publisher: name: arXiv
Year: 1998
Subjects: subject: Astrophysics (astro-ph)
subject: FOS: Physical sciences

description: We have measured the strengths of Ca II Triplet and Mgb stellar absorption lines in the nuclear and off-nuclear spectra of Seyfert galaxies. These features are diluted to varying degrees by continuum emission from the active nucleus and from young stars. Ca II Triplet strengths can be enhanced if late-type supergiant stars dominate the near-IR light. Thus, objects with strong Ca II Triplet and weak Mgb lines may be objects with strong bursts of star formation. We find that for most of our sample the line strengths are at least consistent with dilution of a normal galaxy spectrum by a power law continuum, in accord with the standard model for AGN. However, for several Seyferts in our sample, it appears that dilution by a power law continuum cannot simultaneously explain strong Ca II Triplet and relatively weak Mgb. Also, these objects occupy the region of the IRAS color-color diagram characteristic of starburst galaxies. In these objects it appears that the optical to near-IR emission is dominated by late-type supergiants produced in a circumnuclear burst of star formation.
description: 4 pages, 3 figures, to appear in Advances in Space Research, presented at "The AGN/Host Galaxy Connection" as part of the Scientific Assembly of COSPAR, July 12-18 Nagoya, Japan
Renormalised CFT 3-point functions of scalars, currents and stress tensors
Creators: name: Bzowski, Adam
name: McFadden, Paul
name: Skenderis, Kostas
Publisher: name: arXiv
Year: 2018
Subjects: subject: High Energy Physics - Theory (hep-th)
subject: Strongly Correlated Electrons (cond-mat.str-el)
subject: High Energy Physics - Phenomenology (hep-ph)
subject: FOS: Physical sciences

description: We discuss the renormalisation of mixed 3-point functions involving tensorial and scalar operators in conformal field theories of general dimension. In previous work we analysed correlators of either purely scalar or purely tensorial operators, in each case finding new features and new complications: for scalar correlators, renormalisation leads to beta functions, novel conformal anomalies of type B, and unexpected analytic structure in momentum space; for correlators of stress tensors and/or conserved currents, beta functions vanish but anomalies of both type B and type A (associated with a $0/0$ structure) are present. Mixed correlators combine all these features: beta functions and anomalies of type B, plus the possibility of new type A anomalies. Following a non-perturbative and general momentum-space analysis, we present explicit results in dimensions $d=3,4$ for all renormalised 3-point functions of stress tensors, conserved currents and scalars of dimensions $Δ=d$ and $Δ=d-2$. We identify all anomalies and beta functions, and explain the form of the anomalous conformal Ward identities. In $d=3$, we find a $0/0$ structure but the corresponding type A anomaly turns out to be trivial. In addition, the correlators of two currents and a scalar, and of two stress tensors and a scalar, both feature universal tensor structures that are independent of the scalar dimension and vanish for opposite helicities.
description: 74 pages; published version
Developing magnetite chemistry as an exploration tool for porphyry copper deposits
Creators: name: Sievwright, Robert Hume
Publisher: name: Imperial College London
Year: 2017

description: There is increasing interest in the use of magnetite as a geochemical proxy to interpret ore forming processes. Using laser ablation inductively-coupled plasma mass spectrometry (LA-ICP-MS), a large range of trace elements in magnetite are detectable. However, in order to utilise magnetite as a petrogenetic indicator, a comprehensive understanding of the controls of its chemistry is required. Experiments were conducted, both at 1-atm and at high-pressure, investigating magnetite-melt partitioning as a function of oxygen fugacity (fO2), temperature, bulk composition, pressure and water content. Magnetite-melt partitioning can be explained in terms of thermodynamic equilibria between magnetite and melt. The presence of magnetite-rich spinel in equilibrium with melt over a range of fO2 implies a reciprocal relationship between a(Fe2+O) and a(Fe3+O1.5) in the melt. This relationship can be used to derive expressions which explain magnetite-melt partitioning as a function of aFe3O3(spinel), XFe2+O(melt), XFe3+O1.5(melt) and fO2. As a result of this, there is an increase in magnetite-melt partitioning of divalent cations and Cu with increasing fO2 in silicic, but less so in mafic bulk compositions. There are also strong decreases in magnetite-melt partitioning of 4+ and higher valence cations with increasing fO2. A study was conducted to develop a method which optimises the use of LA-ICP-MS to analyse natural magnetite. Using this method, over 2000 magnetite grains, both hydrothermal and igneous, were analysed in rocks associated with porphyry copper systems. Discriminant projection analysis using elements frequently detected using LA-ICP-MS can be used to effectively discriminate various populations of hydrothermal magnetite. Using these discrimination methods, it is possible to distinguish well-mineralised from less-mineralised porphyry ore-forming environments. Igneous magnetite is susceptible to having its chemistry modified by hydrothermal fluids and commonly undergoes oxy-exsolution, which alters its chemistry. Consequently, it is difficult to petrogenetically study the magmatic environment using magnetite associated with porphyry copper systems.
A Reanalysis of theUltraviolet Extinction from Interstellar Dust in the Large Magellanic Cloud
Creators: name: Misselt, K. A.
name: Clayton, Geoffrey C.
name: Gordon, Karl D.
Publisher: name: arXiv
Year: 1998
Subjects: subject: Astrophysics (astro-ph)
subject: FOS: Physical sciences

description: We have reanalyzed the Large Magellanic Cloud's (LMC) ultraviolet (UV) extinction using data from the IUE final archive. Our new analysis takes advantage of the improved signal--to--noise of the IUE NEWSIPS reduction, the exclusion of stars with very low reddening, the careful selection of well matched comparison stars, and an analysis of the effects of Galactic foreground dust. Differences between the average extinction curves of the 30 Dor region and the rest of the LMC are reduced compared to previous studies. We find that there is a group of stars with very weak 2175 Ang. bumps that lie in or near the region occupied by the supergiant shell, LMC 2, on the southeast side of 30 Dor. The average extinction curves inside and outside LMC 2 show a very significant difference in 2175 Ang. bump strength, but their far--UV extinctions are similar. While it is unclear whether or not the extinction outside the LMC 2 region can be fit with the relation of Cardelli, Clayton and Mathis (CCM), sightlines near LMC 2 cannot be fit with CCM due to their weak 2175 Ang. bumps. While the extinction properties seen in the LMC lie within the range of properties seen in the Galaxy, the correlations of UV extinction properties with environment seen in the Galaxy do not appear to hold in the LMC.
description: 29 pages, 10 figures, to be published in ApJ
Quantum advantage of unitary Clifford circuits with magic state inputs
Creators: name: Yoganathan, Mithuna
name: Jozsa, Richard
name: Strelchuk, Sergii
Publisher: name: arXiv
Year: 2018
Subjects: subject: Quantum Physics (quant-ph)
subject: FOS: Physical sciences

description: We study the computational power of unitary Clifford circuits with solely magic state inputs (CM circuits), supplemented by classical efficient computation. We show that CM circuits are hard to classically simulate up to multiplicative error (assuming PH non-collapse), and also up to additive error under plausible average-case hardness conjectures. Unlike other such known classes, a broad variety of possible conjectures apply. Along the way we give an extension of the Gottesman-Knill theorem that applies to universal computation, showing that for Clifford circuits with joint stabiliser and non-stabiliser inputs, the stabiliser part can be eliminated in favour of classical simulation, leaving a Clifford circuit on only the non-stabiliser part. Finally we discuss implementational advantages of CM circuits.
description: 25 pages. 3 figures. Accepted manuscript. To appear in Proc. Roy. Soc. (Lond) A
Gas accretion in Milky Way-like galaxies: temporal and radial dependencies
Creators: name: Nuza, Sebastian E.
name: Scannapieco, Cecilia
name: Chiappini, Cristina
name: Junqueira, Thiago C.
name: Minchev, Ivan
name: Martig, Marie
Publisher: name: arXiv
Year: 2018
Subjects: subject: Astrophysics of Galaxies (astro-ph.GA)
subject: FOS: Physical sciences

description: One of the fundamental assumptions of chemical evolution models (CEMs) of the Milky Way (MW) and other spirals is that higher gas accretion rates are expected in the past, and in the inner regions of the Galaxy. This leads to the so-called `inside-out disc formation scenario'. Yet, these are probably the most unconstrained inputs of such models. In the present paper, we aim at investigating these main assumptions by studying how gas is accreted in four simulated MW-like galaxies assembled within the $Λ$CDM scenario. The galaxies were obtained using two different simulation techniques, cosmological setups and initial conditions. Two of them are MW candidates corresponding to the chemodynamical model of Minchev et al. (2013, 2014) (known as MCM) and the Local Group cosmological simulation of Nuza et al. (2014). We investigate vertical and radial gas accretion on to galaxy discs as a function of cosmic time and disc radius. We find that accretion in the MW-like galaxies seem to happen in two distinct phases, namely: an early, more violent period; followed by a subsequent, slowly declining phase. Our simulations seem to give support to the assumption that the amount of gas incorporated into the MW disc exponentially decreases with time, leading to current net accretion rates of $0.6-1\,$M$_\odot\,$yr$^{-1}$. In particular, accretion timescales on to the simulated thin-disc-like structures are within $\sim5-7\,$Gyr, consistent with expectations from CEMs. Moreover, our simulated MW discs are assembled from the inside-out with gas in the inner disc regions accreted in shorter timescales than in external ones, in qualitative agreement with CEMs of the Galaxy. However, this type of growth is not general to all galaxies and it is intimately linked to their particular merger and gas accretion history.
description: Replaced to match published version. References and table added; 20 pages, 13 figures, 2 tables. Gas accretion timescale vs. galactocentric radius for simulated MW candidates shown in Table B1
Near-Infrared Microlensing of Stars by the Super-Massive Black Hole in the Galactic Center
Creators: name: Alexander, Tal
name: Sternberg, Amiel
Publisher: name: arXiv
Year: 1998
Subjects: subject: Astrophysics (astro-ph)
subject: FOS: Physical sciences

description: We investigate microlensing amplification of faint stars in the dense stellar cluster in the Galactic Center (GC) by the super-massive black hole (BH). Such events would appear very close to the position of the radio source SgrA*, which is thought to coincide with the BH, and could be observed during the monitoring of stellar motions in the GC. We use the observed K-band (2.2 um) luminosity function (KLF) in the GC and in Baade's Window, as well as stellar population synthesis computations, to construct KLF models for the inner 300 pc of the Galaxy. These, and the observed dynamical properties of this region, are used to compute the rates of microlensing events, which amplify stars above specified detection thresholds. We present computations of the lensing rates and amplifications as functions of the event durations (weeks to years), for a range of detection thresholds. We find that short events dominate the total rate and that long events tend to have large amplifications. For the current detection limit of K=17 mag, the total microlensing rate is 0.003 1/yr, and the rate of events with durations >1 yr is 0.001 1/yr. Recent GC proper motion studies have revealed the possible presence of one or two variable K-band sources very close to SgrA* (Genzel et al 97; Ghez et al 98). These sources may have attained peak brightnesses of K~15 mag, about 1.5-2 mag above the observational detection limits, and appear to have varied on a timescale of ~1 yr. This behavior is consistent with long-duration microlensing of faint stars by the BH. However, we estimate that the probability that such an event could have been detected during the course of the recent proper motion studies is \~0.5%. A ten-fold improvement in the detection limit and 10 yr of monthly monitoring would increase the total detection probability to ~20%. (Abridged)
description: 29 p. with 5 figs. To appear in ApJ. Changed to reflect published version. Short discussions of solar metallicity luminosity function and star-star microlensing added
Protein fold recognition with contact threading
Creators: name: Miao, Hongjiang
Publisher: name: Imperial College London
Year: 2017

description: Successful fold recognition can be readily achieved by current homology detection methods if there exists sufficient sequence similarity between the protein of interest and known structures. However, when such sequence signal does not exist or is too remote to be detected, the task of fold recognition and tertiary structure prediction becomes immensely difficult due to the enormous conformational space to explore. In this thesis, a novel contact threading approach, PhyrePower, which avoids the sequence constraint by identifying structural similarity through protein contact map matching is presented. By combining eigendecomposition and classic dynamic programming algorithms, PhyrePower can effectively utilize the information in predicted residue-residue contacts even in the presence of considerable noise. The potential of this approach is exemplified by its ability to identify a similar structure for 36% of the proteins in a validation set where structural relatives were completely undetectable by the state-of-the-art profile HMM-HMM method. With a simple alignment refinement, a model with a TM-score above 0.5 against the native structure was constructed for 18% of the proteins by PhyrePower. Traditionally, predicted protein contact maps were used as distance constraints in template-free modelling. A widely used molecular mechanics package, TINKER was thoroughly optimised in this work to represent the upper limit on the performance of such contact-assisted methods and a model with a TM-score above 0.5 against the native structure was produced for 11% of the proteins in the validation set. A comparative evaluation between the two methods demonstrated PhyrePower's ability to succeed on the challenging modelling task where an advanced sequence-based method and a direct modelling approach both failed and thus, highlighted PhyrePower's added value in protein folding.
A characterization of the Arf property for quadratic quotients of the Rees algebra
Creators: name: Borzì, Alessio
Publisher: name: arXiv
Year: 2018
Subjects: subject: Commutative Algebra (math.AC)
subject: FOS: Mathematics
subject: 20M14 (Primary) 13A30, 13B22, 14E15 (Secondary)

description: We provide a characterization of the Arf property in both the numerical duplication of a numerical semigroup and in a member of a family of quotients of the Rees algebra studied in arXiv:1403.4200 [math.AC]
Crax Linnaeus, 1758, gen. nov.
Creators: name: Linnaeus, Carolus
Publisher: name: Laurentius Salvius
Year: 1758
Subjects: Biodiversity
Taxonomy
Animalia
Chordata
Aves
Craciformes
Cracidae
Crax

description: Crax [gen. nov.]
Rostrum basi cera obtectum.
Pennae caput tegentes revolutae.
description: Published as part of Linnaeus, Carolus, 1758, Systema Naturae per regna tria naturae: secundum classes, ordines, genera, species, cum characteribus, differentiis, synonymis, locis, Stockholm :Laurentius Salvius on page 157, DOI: 10.5962/bhl.title.542, http://zenodo.org/record/3922206
A quantitative framework for the assessment of transport vulnerability in container liner service networks
Creators: name: Achurra Gonzalez, Pablo Ernesto
Publisher: name: Imperial College London
Year: 2017

description: Access to the global container liner service network is vital to international trade. Disruptions to this network have major and immediate implications for consumers, industries, markets and national economies. The measurement and understanding of the existing liner service network performance susceptibility to disruptions (transport vulnerability) is therefore of critical importance to public and private stakeholders responsible for ensuring its operability and accessibility. Methodologies that assess transport vulnerability in liner service networks face two key modelling challenges: (i) A lack of historical disruption data on network components (such as ports, canals, and liner services) and (ii) the typical size of realistic liner service networks. The first challenge limits the implementation of methodologies that require prior knowledge of disruption probabilities to quantify the vulnerability of the network. The second challenge creates the need for models capable of capturing key industry practices such as transhipment, empty repositioning, and the ability of vessels to skip disrupted ports while still allowing implementations at realistic global scales. This study addresses the above-mentioned challenges by developing a quantitative framework capable of identifying critical components in large-scale networks with limited or unavailable historical disruption data. The proposed framework consists of a game-theoretic attacker-defender model (ADM) and a cost-based container assignment model (CBCAM) adapted for the analysis of networks under disruptions. The ADM consists of a two-player, zero-sum game between a malevolent agent (attacker) that seeks to maximise disruption costs and an ocean carrier (defender) that aims to minimise routing costs. The CBCAM is used to generate the payoff matrix of the game computing routing costs for the ocean carrier and disruption costs for the attacker on each of their available strategies. Linear program formulations of the joint AD-CBCAM allow for implementations on large-scale realistic liner service networks. This scalability is tested using CPLEX to solve network instances of up to 88 distinct liner services, 230 ports, and 2,648 OD pairs. Results allow establishing performance baselines and test the effectiveness of iterative interventions aimed at increasing the resilience of the system.
Turbulent Cooling Flows in Molecular Clouds
Creators: name: Myers, P.
name: Lazarian, A.
Publisher: name: arXiv
Year: 1998
Subjects: subject: Astrophysics (astro-ph)
subject: FOS: Physical sciences

description: We propose that inward, subsonic flows arise from the local dissipation of turbulent motions in molecular clouds. Such "turbulent cooling flows" may account for recent observations of spatially extended inward motions towards dense cores. These pressure-driven flows may arise from various types of turbulence and dissipation mechanisms. For the example of MHD waves and turbulence damped by ion-neutral friction, sustained cooling flow requires that the outer gas be sufficiently turbulent, that the inner gas have marginal field-neutral coupling, and that this coupling decrease sufficiently rapidly with increasing density. These conditions are most likely met at the transition between outer regions ionized primarily by UV photons and inner regions ionized primarily by cosmic rays. If so, turbulent cooling flows can help form dense cores, with speeds faster than expected for ambipolar diffusion. Such motions could reduce the time needed for dense core formation and could precede and enhance the motions of star-forming gravitational infall.
description: To appear ApJL, Nov.10, 4 ApJ style pages, Postscript
Profiling protein prenylation using a quantitative chemical proteomics approach
Creators: name: Storck Saha, Elisabeth
Publisher: name: Imperial College London
Year: 2016

description: Prenylation, the attachment of a farnesyl or geranylgeranyl isoprenoid to a C-terminal cysteine, is a post-translational modification which modulates localisation and function of key proteins such as members of the RAS superfamily, nuclear lamins and heterotrimeric G-proteins. In humans, three enzymes catalyse the prenylation reaction: farnesyl transferase, geranylgeranyl transferase type 1 and RAB geranylgeranyl transferase. Substantial effort has gone into developing therapeutics that disrupt prenylation as a means of targeting RAS-driven cancers, yet these approaches have failed to deliver in clinical trials. This is largely due to the fact that the dynamics of prenylation in response to prenyl transferase inhibitors is more complex than originally envisaged and includes changes in prenylation state and altered substrate recognition by the different transferase enzymes. Emerging research shows that prenylation also plays a role in cardiovascular and neurodegenerative diseases, Hutchinson-Gilford progeria syndrome (HGPS), choroideremia and viral infections. Advances in the study of protein prenylation are hampered by the lack of inherent handles that allow for isolation and identification of the prenylated proteome. Novel approaches for profiling the prenylated proteome, its dynamics, and effects of varied inhibitors of the prenyl transferases are imperative for explaining past failures and to direct future studies. This thesis presents a novel set of isoprenoid analogues that can selectively label prenylated proteins in cells. The application of these probes in combination with quantitative proteomic techniques enabled the description of the complex dynamics between different isoprenoid substrates and transferases in response to prenyl transferase inhibitors, and to validate several novel prenylated substrates. We describe attempts to profile prenylation in cells derived from HGPS patients, and explore potential targets of farnesyl transferase inhibition in pulmonary arterial cells. We envisage that the robust methodology presented herein will be widely applicable to the study of prenylation in the context of both health and disease.
Heating of the IGM
Creators: name: Pen, Ue-Li
Publisher: name: arXiv
Year: 1998
Subjects: subject: Astrophysics (astro-ph)
subject: FOS: Physical sciences

description: Using the cosmic virial theorem, Press-Schechter analysis and numerical simulations, we compute the expected X-ray background (XRB) from the diffuse IGM with the clumping factor expected from gravitational shock heating. The predicted fluxes and temperatures are excluded from the observed XRB. The predicted clumping can be reduced by entropy injection. The required energy is computed from the two-point correlation function, as well as from Press-Schechter formalisms. The minimal energy injection of 1 keV/nucleon excludes radiative or gravitational heating as a primary energy source. We argue that the intergalactic medium (IGM) must have been heated through violent processes such as massive supernova bursts. If the heating proceeded through supernova explosions, it likely proceeded in bursts which may be observable in high redshift supernova searches. Within our model we reproduce the observed cluster luminosity-temperature relation with energy injection of 1 keV/nucleon if this injection is assumed to be uncorrelated with the local density. These parameters predict that the diffuse IGM soft XRB has a temperature of ~1 keV with a flux near 10 keV/cm^2 s str keV, which may be detectable in the near future.
description: to appear in ApJ Lett., 11 pages incl 1 figure
title: ADCO, Comptes du Petit-Cîteaux (1477-1491) (11 H 1179), f. 00165
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/2019
name: Petot, Frédéric
name: Archives Départementales De La Côte-D'Or
Publisher: name: NAKALA - https://nakala.fr (Huma-Num - CNRS)
publisherIdentifier: https://ror.org/04ces3204
publisherIdentifierScheme: ROR
Year: 2020
Subjects: subject: cartulaire
subject: comptes
subject: LaMOP
subject: Laboratoire de Médiévistique Occidentale de Paris
subject: Corpus Burgundiae Medii Aevi
subject: Chartes de la Bourgogne du Moyen Âge

description: Comptes du Petit-Cîteaux (1477-1491), Archives départementales de la Côte-d'Or, (11 H 1179). Numérisation en mode image.
description: Relation: http://www.cbma-project.eu/
description: Bibliographic citation: Comptes du Petit-Cîteaux (1477-1491), Archives départementales de la Côte-d'Or, (11 H 1179), f. 00165, 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
Parallel Navigation, Proportional Navigation and Range Vector Correlation from Interception by two predatory fly species is explained by a proportional navigation feedback controller
Creators: name: Fabian, Samuel T.
name: Sumner, Mary E.
name: Wardill, Trevor J.
name: Rossoni, Sergio
name: Gonzalez-Bellido, Paloma T.
Publisher: name: The Royal Society
Year: 2018
Subjects: subject: Evolutionary Biology
subject: FOS: Biological sciences
subject: Computational Biology

description: (a) Parallel navigation, depicted as two boats navigating at sea where boat A is attempting to intercept boat B. Parallel navigation describes the fact that as the two boats approach each other on a collision course, the line-of-sight does not rotate relative to the external world (here represented as North). This means that the bearing angle γ, formed between north and the LoS does not change over time. (b) Proportional navigation is represented as the response of Boat A to maintain a collision course. If the LoS rotates and thus changes the bearing of Boat B from A, then Boat A should magnify these rotations in its steering, multiplying them by a fixed navigational constant (N). (c) The process by which range vector correlation (an index of parallelism of successive LoS) is measured is diagrammatically represented in a step-by-step guide.
Hydrodynamics of Accretion onto Black Holes
Creators: name: Park, Myeong-Gu
name: Ostriker, Jeremiah P.
Publisher: name: arXiv
Year: 1998
Subjects: subject: Astrophysics (astro-ph)
subject: FOS: Physical sciences

description: Spherical and axisymmetric accretion onto black holes is discussed. Physical processes in various families of solutions are explained and their characteristics are summarized. Recently discovered solutions of axisymmetric flow provide us with various radiation efficiency and spectrum, which may successfully model diverse accretion systems. Possible role of preheating is also speculated. The various families of solutions can be plotted as trajectories on the plane of (l,e) [or (l,dot m)] where l is the luminosity in units of the Eddington luminosity, dot m is the similarly defined mass accretion rate and e is the efficiency defined by e equiv L/dot M c^2 = l/dot m. We discuss the domains on these planes where solutions are known or expected to be unstable to either spherical or on-spherical perturbations. Preliminary analysis indicates that a preheating instability will occur along the polar direction of the advection dominated flow for e \gsim 10^{-2}.
description: Figs 1 & 2 replaced with corrected figures. 9 pages, 3 Postscript figures. Plain tex. Review talk presented at 31st COSPAR meeting (1996). Revised version will appear in Adv. in Space Research