cometadata/datacite-rtg-text-other-reclassification-records huggingface dataset:
Naturalness and a light $Z'$
Creators: name: Zhu, Bin
name: Staub, Florian
name: Ding, Ran
Publisher: name: arXiv
Year: 2017
Subjects: subject: High Energy Physics - Phenomenology (hep-ph)
subject: FOS: Physical sciences

description: Models with a light, additional gauge boson are attractive extensions of the standard model. Often these models are only considered as effective low energy theory without any assumption about an UV completion. This leaves not only the hierarchy problem of the SM unsolved, but introduces a copy of it because of the new fundamental scalars responsible for breaking the new gauge group. A possible solution is to embed these models into a supersymmetric framework. However, this gives rise to an additional source of fine-tuning compared to the MSSM and poses the question how natural such a setup is. One might expect that the additional fine-tuning is huge, namely, $O(M^2_{\rm SUSY}/m^2_{Z'})$. In this paper we point out that this is not necessarily the case. We show that it is possible to find a focus point behaviour also in the new sector in co-existence to the MSSM focus point. We call this 'Double Focus Point Supersymmetry'. Moreover, we stress the need for a proper inclusion of radiative corrections in the fine-tuning calculation: a tree-level estimate would lead to predictions for the tuning which can be wrong by many orders of magnitude. As showcase, we use the $U(1)_{B-L}$ extended MSSM and discuss possible consequence of the observed $^8\textrm{Be}$ anomaly. However, similar features are expected for other models with an extended gauge group which involve potentially large Yukawa-like interactions of the new scalars.
description: 11 pages, 4 figures, two column format, reference updated
On Fuchs' Problem about the group of units of a ring
Creators: name: Del Corso, Ilaria
name: Dvornicich, Roberto
Publisher: name: arXiv
Year: 2017
Subjects: subject: Commutative Algebra (math.AC)
subject: FOS: Mathematics
subject: 16U60, 13A99, 20K15

description: In \cite[Problem 72]{Fuchs60} Fuchs posed the problem of characterizing the groups which are the groups of units of commutative rings. In the following years, some partial answers have been given to this question in particular cases. In a previous paper \cite{DDcharp} we dealt with finite characteristic rings. In this paper we consider Fuchs' question for finite groups and we address this problem in two cases. Firstly, we study the case of torson-free rings and we obtain a complete classification of the finite groups of units which arise in this case. Secondly, we examine the case of characteristic zero rings obtaining, a pretty good description of the possible groups of units equipped with families of examples of both realizable and non-realizable groups. The main tools to deal with this general case are the Pearson and Schneider splitting of a ring \cite{PearsonSchneider70}, our previous results on finite characteristic rings \cite{DDcharp} and our classification of the groups of units of torsion-free rings. As a consequence of our results we completely answer Ditor's question \cite{ditor} on the possible cardinalities of the group of units of a ring.
description: arXiv admin note: substantial text overlap with arXiv:1607.00965
A Mid-Infrared Study of the Young Stellar Population in the NGC 2024 Cluster
Creators: name: Haisch, Karl E.
name: Lada, Elizabeth A.
name: Pina, Robert K.
name: Telesco, Charles M.
name: Lada, Charles J.
Publisher: name: arXiv
Year: 2000
Subjects: subject: Astrophysics (astro-ph)
subject: FOS: Physical sciences

description: We present the results of the first broadband 10.8 um survey of the NGC 2024 cluster. The mid-infrared data were combined with our previously published JHKL photometry in order to construct spectral energy distributions for all detected sources. The main scientific goals were to investigate the nature of the young stellar objects (YSOs) in the cluster, and to examine the efficiency of detecting circumstellar disk sources from near-infrared JHKL color-color diagrams. Out of 59 sources surveyed having K-band magnitudes K < 10.5, we detected 35 (~59%) at 10 um. Combining these detections, and upper limits for the non-detections, with existing JHKL data, we identify 1 Class I, 6 flat spectrum, 28 Class II and 5 Class III sources. We find a circumstellar disk fraction for NGC 2024 of ~85% +/- 15%, which confirms earlier published suggestions that the majority, if not all, of the stars in NGC 2024 formed with disks, and these disks still exist at the present time. In addition, all but one of the disk sources identified in our survey lie in the infrared excess region of the JHKL color-color diagram for the cluster. This demonstrates that JHKL color-color diagrams are extremely efficient in identifying YSOs with disks. Of the 14 sources with K - L colors suggestive of protostellar objects, \~29% are protostellar in nature, while ~7% are true Class I YSOs. This may be due to extinction producing very red K - L colors in Class II YSOs, thus making them appear similar in color to protostars. This suggests caution must be applied when estimating the sizes and lifetimes of protostellar populations within star forming regions based on K - L colors alone. Finally, we calculate the luminosities of the Class II YSOs in NGC 2024, rho Oph and Taurus and discuss the results.
description: 30 pages, 8 figures, paper to appear in March AJ
Analysis and mitigation of interface losses in trenched superconducting coplanar waveguide resonators
Creators: name: Calusine, Greg
name: Melville, Alexander
name: Woods, Wayne
name: Das, Rabindra
name: Stull, Corey
name: Bolkhovsky, Vlad
name: Braje, Danielle
name: Hover, David
name: Kim, David K.
name: Miloshi, Xhovalin
name: Rosenberg, Danna
name: Sevi, Arjan
name: Yoder, Jonilyn L.
name: Dauler, Eric A.
name: Oliver, William D.
Publisher: name: arXiv
Year: 2017
Subjects: subject: Quantum Physics (quant-ph)
subject: Applied Physics (physics.app-ph)
subject: FOS: Physical sciences

description: Improving the performance of superconducting qubits and resonators generally results from a combination of materials and fabrication process improvements and design modifications that reduce device sensitivity to residual losses. One instance of this approach is to use trenching into the device substrate in combination with superconductors and dielectrics with low intrinsic losses to improve quality factors and coherence times. Here we demonstrate titanium nitride coplanar waveguide resonators with mean quality factors exceeding two million and controlled trenching reaching 2.2 $μ$m into the silicon substrate. Additionally, we measure sets of resonators with a range of sizes and trench depths and compare these results with finite-element simulations to demonstrate quantitative agreement with a model of interface dielectric loss. We then apply this analysis to determine the extent to which trenching can improve resonator performance.
R script used in the analysis. from Poor geographical match between the distributions of host diversity and parasite discovery effort
Creators: name: Jorge, Fátima
name: Poulin, Robert
Publisher: name: The Royal Society
Year: 2018
Subjects: subject: Ecology
subject: FOS: Biological sciences

description: Mapping global parasite diversity is crucial to identify geographical hotspots of emerging disease, and guide public health and conservation efforts. In principle, assuming a bottom-up coupling between the diversity of resources and consumers, the geographical distribution of parasite diversity should match that of host diversity. We test the expected spatial congruence between host and parasite diversity for helminth parasites of vertebrate hosts, across grid cells of a global map. Using high-resolution databases on host species distributions and newly-compiled data on the geographical distribution of parasite species discovery, we found positive covariation between host species richness and the number of parasite species discovered, for all vertebrate groups, regardless of the analytical method used, spatial autocorrelation, and spatial resolution. However, all associations were very weak, indicating a poor match between host species richness and parasite species discovery. The research deficit in parasite discovery peaks in areas corresponding to hotspots of host diversity, where disproportionately fewer new parasites are discovered than expected based on local host richness. This spatially biased research effort prevents a full inventory of parasite biodiversity, and impedes predictions of where new diseases may emerge. The host taxon-specific maps we produced, however, can guide future efforts to uncover parasite biodiversity.
Zercon turcicus Urhan & Ayyildiz 1994
Creators: name: Bilki, Kamil
name: Urhan, Raşit
name: Karaca, Mehmet
Publisher: name: Zenodo
Year: 2022
Subjects: Biodiversity
Taxonomy
Animalia
Arthropoda
Arachnida
Mesostigmata
Zerconidae
Zercon
Zercon turcicus

description: Zercon turcicus Urhan & Ayyıldız, 1994
 Materials examined: Five females: soil and litter samples under kermes oak (Q. coccifera) and pink rock-rose (Cistus creticus), 36°51.773' N, 28°33.919' E, 348 m a.s.l., vicinity of Sultaniye and Ekincik neighorboods, 28 April 2021.
 Short desription: On podonotum, all setae short, smooth and needle-like, excluding seta j1 and marginal setae s3, s6, r4–5 which are finely barbed. On opisthonotum, setae J1–2 and Z1–2 short, smooth and needle-like. Setae S1–2 and marginal setae R 1–6 finely barbed. Setae J3–5, Z3–5 and S3–5 elongated, finely barbed with hyaline endings. Although seta S4 reaching to margin of opisthonotum, seta S5 reaching to beyond of opisthonotum. Pores gdS2 located between setae S3 and S4, gdZ3 located between setae J5 and Z4, closer to Z4. Dorsal cavities distinct and strongly developed. Anterior margin of ventrianal shield with two pairs of setae (JV1 and ZV 1), glands gv2 present. Posterolateral tips of peritrematal shield reach to level of setae S1 (Urhan and Ayyıldız, 1994; Karaca et al., 2017; Kavianpour et al., 2018; Bilki, 2021).
Turkish distribution: Afyonkarahisar, Aydın, Erzurum, Kırklareli (Bilki, 2021), Muğla (present study).
Known distribution: Turkey (Urhan and Ayyıldız, 1994), Iran (Karaca et al., 2017; Kavianpour et al., 2018).
description: Published as part of Bilki, Kamil, Urhan, Raşit & Karaca, Mehmet, 2022, Mites of the family Zerconidae (Acari: Mesostigmata) from Southwestern Turkey, with description of three new species, pp. 89-103 in Acarological Studies 4 (2) on page 92, DOI: 10.47121/acarolstud.1129248, http://zenodo.org/record/10831691
Bayesian Pairwise Estimation Under Dependent Informative Sampling
Creators: name: Williams, Matthew R.
name: Savitsky, Terrance D.
Publisher: name: arXiv
Year: 2017
Subjects: subject: Methodology (stat.ME)
subject: FOS: Computer and information sciences
subject: 62D05, 62G20

description: An informative sampling design leads to the selection of units whose inclusion probabilities are correlated with the response variable of interest. Model inference performed on the resulting observed sample will be biased for the population generative model. One approach that produces asymptotically unbiased inference employs marginal inclusion probabilities to form sampling weights used to exponentiate each likelihood contribution of a pseudo likelihood used to form a pseudo posterior distribution. Conditions for posterior consistency restrict applicable sampling designs to those under which pairwise inclusion dependencies asymptotically limit to 0. There are many sampling designs excluded by this restriction; for example, a multi-stage design that samples individuals within households. Viewing each household as a population, the dependence among individuals does not attenuate. We propose a more targeted approach in this paper for inference focused on pairs of individuals or sampled units; for example, the substance use of one spouse in a shared household, conditioned on the substance use of the other spouse. We formulate the pseudo likelihood with weights based on pairwise or second order probabilities and demonstrate consistency, removing the requirement for asymptotic independence and replacing it with restrictions on higher order selection probabilities. Our approach provides a nearly automated estimation procedure applicable to any model specified by the data analyst. We demonstrate our method on the National Survey on Drug Use and Health.
description: 35 pages, 9 figures
NASA Open-Source Science Initiative: Transform to OPen Science (TOPS)
Creators: name: Gentemann, Chelle
name: Ivey, Yvonne
name: Crawford, Steve
name: Baynes, Kathleen
name: Murphy, Kevin
name: Ward, Kevin
name: Cassidy, Emily
name: Ramachandran, Rahul
name: Maskey, Manil
name: Luna-Cruz, Yaitza
name: Lynnes, Christopher
name: Steponaitis, Elena A
Publisher: name: Zenodo
Year: 2021
Subjects: cloud computing, open science, open source software, open access

description: The Transform to OPen Science (TOPS) 5-year initiative will act as a catalyst to jump-start a suite of coordinated activities designed to rapidly transform science.
title: PP_[s.d]_Dessin de figure_Une statue 1
Creators: name: Panerai, Philippe
Publisher: name: NAKALA - https://nakala.fr (Huma-Num - CNRS)
publisherIdentifier: https://ror.org/04ces3204
publisherIdentifierScheme: ROR
Year: 2024
Subjects: subject: architecture
subject: beaux-arts
subject: Écoles des beaux-arts
subject: enseignement
subject: atelier arretche

description: Travaux scolaires de Philippe Panerai à l'École des beaux-arts.
From the quantum Zeno to the inverse quantum Zeno effect
Creators: name: Facchi, P.
name: Nakazato, H.
name: Pascazio, S.
Publisher: name: arXiv
Year: 2000
Subjects: subject: Quantum Physics (quant-ph)
subject: FOS: Physical sciences

description: The temporal evolution of an unstable quantum mechanical system undergoing repeated measurements is investigated. In general, by changing the time interval between successive measurements, the decay can be accelerated (inverse quantum Zeno effect) or slowed down (quantum Zeno effect), depending on the features of the interaction Hamiltonian. A geometric criterion is proposed for a transition to occur between these two regimes.
description: 6 pages, 3 figures
New Concept for Testing General Relativity: The Laser Astrometric Test of Relativity (LATOR) Mission
Creators: name: Turyshev, Slava G.
name: Shao, Michael
name: Nordtvedt, Kenneth
Publisher: name: arXiv
Year: 2003
Subjects: subject: General Relativity and Quantum Cosmology (gr-qc)
subject: FOS: Physical sciences

description: This paper discusses new Fundamental physics experiment that will test relativistic gravity at the accuracy better than the effects of the second order in the gravitational field strength, ~G^2. The Laser Astrometric Test Of Relativity (LATOR) mission uses laser interferometry between two micro-spacecraft whose lines of sight pass close by the Sun to accurately measure deflection of light in the solar gravity. The key element of the experimental design is a redundant geometry optical truss provided by a long-baseline (100 m) multi-channel stellar optical interferometer placed on the International Space Station (ISS). The spatial interferometer is used for measuring the angles between the two spacecraft and for orbit determination purposes. LATOR will not only improve the value of the parameterized post-Newtonian (PPN) $γ$ to unprecedented levels of accuracy of 1 part in 10e8, it will also reach ability to measure effects of the next post-Newtonian order (1/c^4) of light deflection resulting from gravity's intrinsic non-linearity. The solar quadrupole moment parameter, J2, will be measured with high precision, as well as a variety of other relativistic effects including Lense-Thirring precession. LATOR will lead to very robust advances in the tests of Fundamental physics: this mission could discover a violation or extension of general relativity, or reveal the presence of an additional long range interaction in the physical law. There are no analogs to the LATOR experiment; it is unique and is a natural culmination of solar system gravity experiments.
description: 11 pages, 4 figures, invited talk presented at AIAA Meeting "Space 2003", 23 September 2003, Long Beach, CA
Extended methods and supplementary figures from Poor geographical match between the distributions of host diversity and parasite discovery effort
Creators: name: Jorge, Fátima
name: Poulin, Robert
Publisher: name: The Royal Society
Year: 2018
Subjects: subject: Ecology
subject: FOS: Biological sciences

description: Mapping global parasite diversity is crucial to identify geographical hotspots of emerging disease, and guide public health and conservation efforts. In principle, assuming a bottom-up coupling between the diversity of resources and consumers, the geographical distribution of parasite diversity should match that of host diversity. We test the expected spatial congruence between host and parasite diversity for helminth parasites of vertebrate hosts, across grid cells of a global map. Using high-resolution databases on host species distributions and newly-compiled data on the geographical distribution of parasite species discovery, we found positive covariation between host species richness and the number of parasite species discovered, for all vertebrate groups, regardless of the analytical method used, spatial autocorrelation, and spatial resolution. However, all associations were very weak, indicating a poor match between host species richness and parasite species discovery. The research deficit in parasite discovery peaks in areas corresponding to hotspots of host diversity, where disproportionately fewer new parasites are discovered than expected based on local host richness. This spatially biased research effort prevents a full inventory of parasite biodiversity, and impedes predictions of where new diseases may emerge. The host taxon-specific maps we produced, however, can guide future efforts to uncover parasite biodiversity.
The Origin of the Magnetic Fields of the Universe: The Plasma Astrophysics of the Free Energy of the Universe
Creators: name: Colgate, S. A.
name: Li, H.
name: Pariev, V.
Publisher: name: arXiv
Year: 2000
Subjects: subject: Astrophysics (astro-ph)
subject: FOS: Physical sciences

description: (abridged) The interpretation of Faraday rotation measure maps of AGNs within galaxy clusters has revealed regions, $\sim 50-100$ kpc, that are populated with large, $\sim 30 μ$ G magnetic fields. The magnetic energy of these coherent regions is $\sim 10^{59-60}$ ergs, and the total magnetic energy over the whole cluster ($\sim 1$ Mpc across) is expected to be even larger. A sequence of physical processes that are responsible for the production, redistribution and dissipation of these magnetic fields is proposed. These fields are associated with single AGNs within the cluster and therefore with all galaxies during their AGN phase, simply because only the central supermassive black holes ($\sim 10^8 M_{\odot}$) have an accessible energy, $\sim 10^{61}$ ergs. We propose an $α-Ω$ dynamo process in an accretion disk. The disk rotation naturally provides a large winding number, $\sim 10^{11}$ turns, sufficient to make both large gain and large flux. The helicity of the dynamo can be generated by the differential plume rotation derived from star-disk collisions. This helicity generation process has been demonstrated in the laboratory and the dynamo gain was simulated numerically. A liquid sodium analog of the dynamo is being built. Speculations are that the back reaction of the saturated dynamo will lead to the formation of a force-free magnetic helix, which will carry the energy and flux of the dynamo away from the accretion disk and redistribute the field within the clusters and galaxy walls. The magnetic reconnection of a small fraction of this energy logically is the source of the AGN luminosity, and the remainder of the field energy should then dominate the free energy of the present-day universe.
description: invited review at the 2000 APS/DPP meeting, Quebec, 11 pages, 7 color figs (.jpg)
Magnetic Properties of One-Dimensional Quantum Spin System Rb2Cu2Mo3O12 Studied by Muon Spin Relaxation
Creators: name: Ohira-Kawamura, Seiko
name: Tomiyasu, Keisuke
name: Koda, Akihiro
name: Sari, Dita P.
name: Asih, Retno
name: Yoon, Sungwon
name: Watanabe, Isao
name: Nakajima, Kenji
Publisher: name: arXiv
Year: 2017
Subjects: subject: Strongly Correlated Electrons (cond-mat.str-el)
subject: Materials Science (cond-mat.mtrl-sci)
subject: FOS: Physical sciences

description: Magnetic properties of a one-dimensional frustrated quantum spin system Rb2Cu2Mo3O12 is investigated by the muon spin relaxation (muSR) technique. Although this system shows an incommensurate spin correlation in neutron scattering, it has not yet been determined whether the ground state reaches to a nonmagnetic spin-singlet state or not. In this study, our zero-field (ZF) muSR result undoubtedly reveals a nonmagnetic ground state, which establishes formation of the nonmagnetic incommensurate spin-singlet state in combination of the previous neutron scattering study. Furthermore, we found that the internal field is slightly enhanced below ~7 K. This temperature dependence resembles that of electric polarization under the magnetic field reported recently, indicating a possibility that a small change occurs even under ZF. In longitudinal-field measurements, a fast fluctuation around a narrowing region is observed. This relaxation is expected to reflect characteristics of formation of the spin-singlet state.
description: 5 pages, 3 figures, to be published in J. Phys. Soc. Jpn.: Conf. Proc
Magnetic adatoms in two and four terminal graphene nanoribbons: A comparison between their spin polarized transport
Creators: name: Ganguly, Sudin
name: Basu, Saurabh
Publisher: name: arXiv
Year: 2017
Subjects: subject: Mesoscale and Nanoscale Physics (cond-mat.mes-hall)
subject: FOS: Physical sciences

description: We study the charge and spin transport in two and four terminal graphene nanoribbons (GNR) decorated with random distribution of magnetic adatoms. The inclusion of the magnetic adatoms generates only the $z$-component of the spin polarized conductance via an exchange bias in the absence of Rashba spin-orbit interaction (SOI), while in presence of Rashba SOI, one is able to create all the three ($x$, $y$ and $z$) components. This has important consequences for possible spintronic applications. The charge conductance shows interesting behaviour near the zero of the Fermi energy. Where in presence of magnetic adatoms the familiar plateau at $2e^2/h$ vanishes, thereby transforming a quantum spin Hall insulating phase to an ordinary insulator. The local charge current and the local spin current provide an intuitive idea on the conductance features of the system. We found that, the local charge current is independent of Rashba SOI, while the three components of the local spin currents are sensitive to Rashba SOI. Moreover the fluctuations of the spin polarized conductance are found to be useful quantities as they show specific trends, that is, they enhance with increasing adatom densities. A two terminal GNR device seems to be better suited for possible spintronic applications.
description: 11 pages, 16 figures. arXiv admin note: text overlap with arXiv:1704.06532
Lettre de Giuseppe Ginanni à Jean-François Séguier , 1741-05-23
Creators: name: Ginanni, Giuseppe
name: Ginanni, Giuseppe
Publisher: name: NAKALA - https://nakala.fr (Huma-Num - CNRS)
publisherIdentifier: https://ror.org/04ces3204
publisherIdentifierScheme: ROR
Year: 2022
Subjects: Histoire naturelle

description: Ravenna 23 maggio 1741
Sig.e Gianfran.o P.ron. Riv.mo

Ho finalmente ricevuta la scattoletta con entro i legni impietriti, e le nerite dell’Adice. Nell’avanzare intanto a lei Sig.e Gianfran.o Riv.mo questa notizia, siccome procuro di corrispondere alle mie obbligazioni con un divoto gradimento ; cosi posso dirle che il tutto è stato da me sommamente gradito, e in spezie le nerite, che veramente sono degne di essere poste nel museo.
Desiderarei bensi d’intendere da lei, se meno scendan dai monti, o se siano di acqua dolce oppure se derivino dal mare, e ciò ricerco per poterle riporre nella serie di que’ testacei, che ad esse conviensi. Mi auguro intanto ancor io la sorte di poterle contracambiare il regalo fattomi coll’esebirle tutto ciò, che più le è di piacere, ed in fine con vera stima mi raffermo.
Di Lei sig.e Gianfran.o Pron Riv.mo a cui sogiungo che l’insetto mandatomi, sono uova di una farfalla, la quale le depose inviluppate ne peli che ritrovasi avere attorno l’are.
Dev.mo et obb.mo serv.re
Giuseppe di Prospero Zinanni
[fol. 257v, 258r-v blanc]
description: Source: [établissement de conservation] Nîmes, Bibliothèque Carré d'Art [cote] ms. 94, fol. 257-258
[O II] as a tracer of current star formation
Creators: name: Jansen, Rolf A.
name: Franx, Marijn
name: Fabricant, Daniel
Publisher: name: arXiv
Year: 2000
Subjects: subject: Astrophysics (astro-ph)
subject: FOS: Physical sciences

description: [O II] lambda 3727 Angstrom is often used as a tracer of star formation at intermediate redshifts (z > 0.4), where Halpha is not easily observed. We use the spectrophotometric data of the Nearby Field Galaxy Survey to investigate the range and systematic variation in observed [O II]/Halpha emission line ratio as a function of galaxy luminosity at low redshift. We find that the observed [O II]/Halpha ratio varies by a factor of 7 at luminosities near M_B*. The [O II]/Halpha ratio is inversely correlated with luminosity. The scatter in the [O II]/Halpha ratio and the dependence of the ratio on luminosity are due in equal parts to reddening and to the metallicity dependent excitation of the ISM. The uncertainty in star formation rates derived from [O II] fluxes is therefore large. If Halpha cannot be observed, high S/N Hbeta fluxes are much preferable to [O II] fluxes for deriving star formation rates. We present several purely empirical corrections for extinction.
description: 10 pages, LateX, 7 figures included, accepted for publication in The Astrophysical Journal (Part 1)
Full causal dissipative cosmologies with stiff matter
Creators: name: Mak, M. K.
name: Harko, T.
Publisher: name: arXiv
Year: 2003
Subjects: subject: General Relativity and Quantum Cosmology (gr-qc)
subject: FOS: Physical sciences

description: The general solution of the gravitational field equations for a full causal bulk viscous stiff cosmological fluid, with bulk viscosity coefficient proportional to the energy density to the power 1/4, is obtained in the flat Friedmann-Robertson-Walker geometry. The solution describes a non-inflationary Universe, which starts its evolution from a singular state. The time variation of the scale factor, deceleration parameter, viscous pressure, viscous pressure-thermodynamic pressure ratio, comoving entropy and Ricci and Kretschmann invariants is considered in detail.
description: 6 pages, 6 figures, to appear in Int. J. Mod. Phys. D
title: Sea-Search-SeaDataNet: Development of a Common Data Index based upon ISO19115
Creators: name: Schaap, Dick M.A.
name: Maillard, Catherine
name: Sea-Search
name: partners, SeaDataNet
Publisher: name: ASC 2006 - Theme session M
Year: 2024
Subjects: Fisheries and aquaculture
Technologies and data

description: No abstracts are to be cited without prior reference to the author.Sea-Search (2002-2006) and its successor SeaDataNet (2006 - 2010) are major Pan-European projects, undertaken by National Oceanographic Data Centres (NODCs), marine information services and divisions of major national institutes, from nearby all coastal states bordering all European seas. Sea-Search focused on metadata and has established and populated an array of directories and overviews of ocean and marine data & information resources; these are available from the Sea-Search portal website http://www.seasearch.net. SeaDataNet continues and expands the operation & maintenance of the Sea-Search directory services and moreover focuses on providing transparent online access to available oceanographic and marine data sets and data products. Inter alia it will interconnect the existing ocean & marine data management centres and enhance and harmonize their current data management facilities and procedures. The Common Data Index (CDI) gives users a highly detailed insight in the availability and geographical spread of marine data across the different data centres and institutes across Europe. The CDI format is deï¬ ned as a dedicated subset of the ISO19115 metadata standard. A CDI XML format supports the exchange between CDI-partners and the central CDI manager, and ensures interoperability with other systems and networks. CDI XML entries are generated by participating data centres (i.e. CDI-partners), directly from their databases. A pilot CDI user interface system has been developed which contains more than 100.000 entries from 10 CDI data centres. SeaDataNet will work on further finetuning and populating the CDI with entries of all data centre partners and possible other institutes in their countries.The European Directory of Marine Organisations - EDMO was launched to manage and to present addresses and profiles of organisations, that are active in Europe in the field of marine & oceanographic data acquisition, data management and research. The maintenance is executed by means of an online Content Management System (CMS). The EDMO directory can be queried and browsed by users via the Sea-Search web portal via a combined alphanumeric - geographical User Interface.
Single-Pulse Preparation of the Uniform Superpositional State used in Quantum Algorithms
Creators: name: Berman, G. P.
name: Borgonovi, F.
name: Izrailev, F. M.
name: Tsifrinovich, V. I.
Publisher: name: arXiv
Year: 2000
Subjects: subject: Quantum Physics (quant-ph)
subject: FOS: Physical sciences

description: We examine a single-pulse preparation of the uniform superpositional wave function, which includes all basis states, in a spin quantum computer. The effective energy spectrum and the errors generated by this pulse are studied in detail. We show that, in spite of the finite width of the energy spectrum bands, amplitude and phase errors can be made reasonably small.
description: RevTex, 5 pages, 7 eps figures
Efficient Raman Sideband Generation in a Coherent Atomic Medium
Creators: name: Huss, A. F.
name: Peer, N.
name: Lammegger, R.
name: Korsunsky, E. A.
name: Windholz, L.
Publisher: name: arXiv
Year: 2000
Subjects: subject: Quantum Physics (quant-ph)
subject: FOS: Physical sciences

description: We demonstrate the efficient generation of Raman sidebands in a medium coherently prepared in a dark state by continuous-wave low-intensity laser radiation. Our experiment is performed in sodium vapor excited in $Λ$ configuration on the D$_{1}$ line by two laser fields of resonant frequencies $ω_{1}$ and $ω_{2}$, and probed by a third field $% ω_{3}$. First-order sidebands for frequencies $ω_{1}$, $ω_{2}$ and up to the third-order sidebands for frequency $ω_{3}$ are observed. The generation starts at a power as low as 10 microwatt for each input field. Dependencies of the intensities of both input and generated waves on the frequency difference ($ω_{1}-ω_{2}$), on the frequency $ω_{3}$ and on the optical density are investigated.
description: 7 pages, 6 figures
Quasi-Black Holes from Extremal Charged Dust
Creators: name: Lemos, Jose' P. S.
name: Weinberg, Erick J.
Publisher: name: arXiv
Year: 2003
Subjects: subject: General Relativity and Quantum Cosmology (gr-qc)
subject: Astrophysics (astro-ph)
subject: High Energy Physics - Theory (hep-th)
subject: FOS: Physical sciences

description: One can construct families of static solutions that can be viewed as interpolating between nonsingular spacetimes and those containing black holes. Although everywhere nonsingular, these solutions come arbitrarily close to having a horizon. To an observer in the exterior region, it becomes increasingly difficulty to distinguish these from a true black hole as the critical limiting solution is approached. In this paper we use the Majumdar-Papapetrou formalism to construct such quasi-black hole solutions from extremal charged dust. We study the gravitational properties of these solutions, comparing them with the the quasi-black hole solutions based on magnetic monopoles. As in the latter case, we find that solutions can be constructed with or without hair.
description: 18 pages
Lyndon Array Construction during Burrows-Wheeler Inversion
Creators: name: Louza, Felipe A.
name: Smyth, W. F.
name: Manzini, Giovanni
name: Telles, Guilherme P.
Publisher: name: arXiv
Year: 2017
Subjects: subject: Data Structures and Algorithms (cs.DS)
subject: FOS: Computer and information sciences

description: In this paper we present an algorithm to compute the Lyndon array of a string $T$ of length $n$ as a byproduct of the inversion of the Burrows-Wheeler transform of $T$. Our algorithm runs in linear time using only a stack in addition to the data structures used for Burrows-Wheeler inversion. We compare our algorithm with two other linear-time algorithms for Lyndon array construction and show that computing the Burrows-Wheeler transform and then constructing the Lyndon array is competitive compared to the known approaches. We also propose a new balanced parenthesis representation for the Lyndon array that uses $2n+o(n)$ bits of space and supports constant time access. This representation can be built in linear time using $O(n)$ words of space, or in $O(n\log n/\log\log n)$ time using asymptotically the same space as $T$.
Unconditional Pointer States from Conditional Master Equations
Creators: name: Dalvit, D. A. R.
name: Dziarmaga, J.
name: Zurek, W. H.
Publisher: name: arXiv
Year: 2000
Subjects: subject: Quantum Physics (quant-ph)
subject: FOS: Physical sciences

description: When part of the environment responsible for decoherence is used to extract information about the decohering system, the preferred {\it pointer states} remain unchanged. This conclusion -- reached for a specific class of models -- is investigated in a general setting of conditional master equations using suitable generalizations of predictability sieve. We also find indications that the einselected states are easiest to infer from the measurements carried out on the environment.
description: 4 pages, 3 .eps figures; final version to appear in Phys.Rev.Lett
Non-equilibrium transport in the pseudospin-1 Dirac-Weyl system
Creators: name: Wang, Cheng-Zhen
name: Xu, Hong-Ya
name: Huang, Liang
name: Lai, Ying-Cheng
Publisher: name: arXiv
Year: 2017
Subjects: subject: Mesoscale and Nanoscale Physics (cond-mat.mes-hall)
subject: FOS: Physical sciences

description: Solid state materials hosting pseudospin-1 quasiparticles have attracted a great deal of recent attention. In these materials, the energy band contains of a pair of Dirac cones and a flat band through the connecting point of the cones. As the "caging" of carriers with a zero group velocity, the flat band itself has zero conductivity. However, in a non-equilibrium situation where a constant electric field is suddenly switched on, the flat band can enhance the resulting current in both the linear and nonlinear response regimes through distinct physical mechanisms. Using the ($2+1$) dimensional pseudospin-$1$ Dirac-Weyl system as a concrete setting, we demonstrate that, in the weak field regime, the interband current is about twice larger than that for pseudospin-1/2 system due to the interplay between the flat band and the negative band, with the scaling behavior determined by the Kubo formula. In the strong field regime, the intraband current is $\sqrt{2}$ times larger than that in the pseudospin-1/2 system, due to the additional contribution from particles residing in the flat band. In this case, the current and field follows the scaling law associated with Landau-Zener tunneling. These results provide a better understanding of the role of the flat band in non-equilibrium transport and are experimentally testable using electronic or photonic systems.
description: 11 pages, 8 figures
Impact of operating rules on planning capacity expansion of urban water supply systems
Creators: name: Tian, Xin
name: Galelli, Stefano
name: de Neufville, Richard
Publisher: name: Taylor & Francis
Year: 2018
Subjects: subject: Space Science
subject: Evolutionary Biology
subject: FOS: Biological sciences
subject: Environmental Sciences not elsewhere classified
subject: Ecology
subject: Sociology
subject: FOS: Sociology
subject: Biological Sciences not elsewhere classified
subject: Information Systems not elsewhere classified

description: Water utilities often rely on industrial water supply (e.g. desalination) to complement natural resources. These climate-independent sources of supply allow operators to respond quickly to varying operating conditions, but require them to choose operating strategies, or rules. How does such operational flexibility impact the performance of water supply systems? How might it affect long-term plans for capacity expansion? Possibly significantly, as demonstrated by the analysis of a water supply system based on Singapore. First, we simulate the dynamics of the system under multiple rainfall and operating scenarios to understand the extent to which the operators’ behavior affect system performance. Results show that different operating rules can have comparable impact on the variability in system performance as hydrological conditions. Then, we show that small changes in the operating rules can lead to substantial changes in the capacity expansions, such as the size of a new desalination plant.
title: Satellite monitoring of Cyanobacterial Blooms in the Baltic Sea- The Baltic Algal Watch System (BAWS)
Creators: name: Hansson, Martin
name: Fyrberg, Lotte
Publisher: name: ASC 2006 - Theme session M
Year: 2024
Subjects: Fisheries and aquaculture
Technologies and data

description: No abstracts are to be cited without prior reference to the author.Satellite monitoring of Cyanobacterial Blooms in the Baltic Sea- The Baltic Algal Watch System (BAWS).
Dimensional regularization of the third post-Newtonian dynamics of point particles in harmonic coordinates
Creators: name: Blanchet, Luc
name: Damour, Thibault
name: Esposito-Farese, Gilles
Publisher: name: arXiv
Year: 2003
Subjects: subject: General Relativity and Quantum Cosmology (gr-qc)
subject: FOS: Physical sciences

description: Dimensional regularization is used to derive the equations of motion of two point masses in harmonic coordinates. At the third post-Newtonian (3PN) approximation, it is found that the dimensionally regularized equations of motion contain a pole part [proportional to 1/(d-3)] which diverges as the space dimension d tends to 3. It is proven that the pole part can be renormalized away by introducing suitable shifts of the two world-lines representing the point masses, and that the same shifts renormalize away the pole part of the "bulk" metric tensor g_munu(x). The ensuing, finite renormalized equations of motion are then found to belong to the general parametric equations of motion derived by an extended Hadamard regularization method, and to uniquely determine the heretofore unknown 3PN parameter lambda to be: lambda = - 1987/3080. This value is fully consistent with the recent determination of the equivalent 3PN static ambiguity parameter, omega_s = 0, by a dimensional-regularization derivation of the Hamiltonian in Arnowitt-Deser-Misner coordinates. Our work provides a new, powerful check of the consistency of the dimensional regularization method within the context of the classical gravitational interaction of point particles.
description: 82 pages, LaTeX 2e, REVTeX 4, 8 PostScript figures, minor changes to reflect Phys. Rev. D version
Noncommutative Unification of General Relativity and Quantum Mechanics. A Finite Model
Creators: name: Heller, M.
name: Odrzygozdz, Z.
name: Pysiak, L.
name: Sasin, W.
Publisher: name: arXiv
Year: 2003
Subjects: subject: General Relativity and Quantum Cosmology (gr-qc)
subject: FOS: Physical sciences

description: We construct a model unifying general relativity and quantum mechanics in a broader structure of noncommutative geometry. The geometry in question is that of a transformation groupoid given by the action of a finite group G on a space E. We define the algebra of smooth complex valued functions on the groupoid, with convolution as multiplication, in terms of which the groupoid geometry is developed. Owing to the fact that the group G is finite the model can be computed in full details. We show that by suitable averaging of noncommutative geometric quantities one recovers the standard space-time geometry. The quantum sector of the model is explored in terms of the regular representation of the groupoid algebra, and its correspondence with the standard quantum mechanics is established.
description: 20 LaTex pages, General Relativity and Gravitation, in press
Spectral properties and breathing dynamics of a few-body Bose-Bose mixture in a 1D harmonic trap
Creators: name: Pyzh, Maxim
name: Krönke, Sven
name: Weitenberg, Christof
name: Schmelcher, Peter
Publisher: name: arXiv
Year: 2017
Subjects: subject: Quantum Gases (cond-mat.quant-gas)
subject: Quantum Physics (quant-ph)
subject: FOS: Physical sciences

description: We investigate a few-body mixture of two bosonic components, each consisting of two particles confined in a quasi one-dimensional harmonic trap. By means of exact diagonalization with a correlated basis approach we obtain the low-energy spectrum and eigenstates for the whole range of repulsive intra- and inter-component interaction strengths. We analyse the eigenvalues as a function of the inter-component coupling, covering hereby all the limiting regimes, and characterize the behaviour in-between these regimes by exploiting the symmetries of the Hamiltonian. Provided with this knowledge we study the breathing dynamics in the linear-response regime by slightly quenching the trap frequency symmetrically for both components. Depending on the choice of interactions strengths, we identify 1 to 3 monopole modes besides the breathing mode of the center of mass coordinate. For the uncoupled mixture each monopole mode corresponds to the breathing oscillation of a specific relative coordinate. Increasing the inter-component coupling first leads to multi-mode oscillations in each relative coordinate, which turn into single-mode oscillations of the same frequency in the composite-fermionization regime.
description: 15 pages, 5 figures, replacement of figure 3 a-c
Changes in the structure of the accretion disc of EX Draconis through the outburst cycle
Creators: name: Baptista, Raymundo
name: Catalan, M. S.
Publisher: name: arXiv
Year: 2000
Subjects: subject: Astrophysics (astro-ph)
subject: FOS: Physical sciences

description: (Abridged) We report on the analysis of high-speed photometry of the dwarf nova EX Dra through its outburst cycle with eclipse mapping techniques. The eclipse maps show evidence of the formation of a one-armed spiral structure in the disc at the early stages of the outburst and reveal how the disc expands during the rise until it fills most of the primary Roche lobe at maximum light. The eclipse maps also suggest the presence of an inward and an outward-moving heating wave during the rise and an inward-moving cooling wave in the decline. Our results suggest a systematic deceleration of both the heating and the cooling waves as they travel across the disc, in agreement with predictions of the disc instability model. The analysis of the brightness temperature profiles indicates that most of the disc appears to be in steady-state during quiescence and at outburst maximum, but not during the intermediate stages. As a general trend, the mass accretion rate in the outer regions is larger than in the inner disc on the rising branch, while the opposite holds during the decline branch. We estimate a mass accretion rate of Mdot= 10^{-8} Msun/yr at outburst maximum and Mdot= 10^{-9.1} Msun/yr in quiescence. The brightness temperature profile in quiescence also suggests that the viscosity parameter is high at this stage which favours the mass-transfer instability model. The uneclipsed light has a steady component, understood in terms of emission from the red secondary star, and a variable component that is proportional to the out of eclipse flux and corresponds to about 3 per cent of the total brightness of the system. The variable component is interpreted as arising in a disc wind.
description: To appear in Mon. Not. R. Ast. Soc., 14 pages, 9 figures, coded with MNRAS latex style
Decoherence and Entanglement in Two-mode Squeezed Vacuum States
Creators: name: Hiroshima, Tohya
Publisher: name: arXiv
Year: 2000
Subjects: subject: Quantum Physics (quant-ph)
subject: FOS: Physical sciences

description: I investigate the decoherence of two-mode squeezed vacuum states by analyzing the relative entropy of entanglement. I consider two sources of decoherence: (i) the phase damping and (ii) the amplitude damping due to the coupling to the thermal environment. In particular, I give the exact value of the relative entropy of entanglement for the phase damping model. For the amplitude damping model, I give an upper bound for the relative entropy of entanglement, which turns out to be a good approximation for the entanglement measure in usual experimental situations.
description: 5 pages, RevTex, 3 eps figures
title: SeaDataNet A Pan-European Infrastructure for Ocean and Marine Data Management
Creators: name: Szaron, Jan
name: Fyrberg, Lotta
Publisher: name: ASC 2006 - Theme session M
Year: 2024
Subjects: Fisheries and aquaculture
Technologies and data

description: No abstracts are to be cited without prior reference to the author.SEADATANET provides the data management infrastructure, to insure long term archiving and access to the large number of multidisciplinary data (i.e. temperature, salinity current, sea level, chemical, physical and biological properties): by many different sensors installed on board of research vessels, satellite and the various platforms of the marine observing system.
Exploration of Large Digital Sky Surveys
Creators: name: Djorgovski, S. G.
name: Brunner, R. J.
name: Mahabal, A. A.
name: Odewahn, S. C.
name: de Carvalho, R. R.
name: Gal, R. R.
name: Stolorz, P.
name: Granat, R.
name: Curkendall, D.
name: Jacob, J.
name: Castro, S.
Publisher: name: arXiv
Year: 2000
Subjects: subject: Astrophysics (astro-ph)
subject: FOS: Physical sciences

description: We review some of the scientific opportunities and technical challenges posed by the exploration of the large digital sky surveys, in the context of a Virtual Observatory (VO). The VO paradigm will profoundly change the way observational astronomy is done. Clustering analysis techniques can be used to discover samples of rare, unusual, or even previously unknown types of astronomical objects and phenomena. Exploration of the previously poorly probed portions of the observable parameter space are especially promising. We illustrate some of the possible types of studies with examples drawn from DPOSS; much more complex and interesting applications are forthcoming. Development of the new tools needed for an efficient exploration of these vast data sets requires a synergy between astronomy and information sciences, with great potential returns for both fields.
description: To appear in: Mining the Sky, eds. A. Banday et al., ESO Astrophysics Symposia, Berlin: Springer Verlag, in press (2001). Latex file, 18 pages, 6 encapsulated postscript figures, style files included