cometadata/datacite-rtg-text-other-reclassification-records huggingface dataset:
title: Sampling fisheries with high levels of accepted relative error may lead to over-estimation of the statistical power of trend detection
Creators: name: Nagelkerke, Leo A.J.
name: Tsehaye, Iyob
Publisher: name: ASC 2006 - Theme session I
Year: 2024
Subjects: Fisheries and aquaculture
Technologies and data

description: No abstracts are to be cited without prior reference to the author.In many fisheries in the tropics detailed biological studies are lacking and the only source of information are fishery statistical data from a catch and effort data recording system (CEDRS). The CEDRS is often designed to sample data with a specific level of accuracy, expressed as the maximum accepted relative error (mre) from the true value. However, the choice for a particular level of mre in an individual data-point may have an effect on the sensitivity to detect trends in a time series of such data-points. We investigated these effects using Catch per unit effort (CpUE) data from the CEDRS of the Eritrean Red Sea fishery. This CEDRS is based on total enumeration of all catches and therefore has an mre of 0, meaning that we know the ‘true’ data-points and time series. We studied the effects of mre levels from 1 to 50%, by calculating the trends in time series, which were simulated by randomly drawing values from the chosen mre interval of each data-point (10,000 replicates). We found that accepting higher levels of mre may lead to finding time series which have lower variability around the trend than the ‘true’ time series, resulting in an estimated higher statistical power for trend detection. Since reliable trend detection in fishery data is of high importance when independent biological data are lacking, we argue that when designing a CEDRS not only the mre of yearly estimates is taken into account, but also the potential effect of the chosen mre on trend detection.
The Second APM UKST Colour Survey for z>4 Quasars
Creators: name: Storrie-Lombardi, Lisa J.
name: Irwin, Michael J.
name: McMahon, Richard G.
name: Hook, Isobel M.
Publisher: name: arXiv
Year: 2000
Subjects: subject: Astrophysics (astro-ph)
subject: FOS: Physical sciences

description: We present the spectra, positions, and finding charts for 31 bright (R<19.3) colour-selected quasars covering the redshift range z=3.85-4.78, with 4 having redshifts z>4.5. The majority are in the southern sky (dec 2.5) colours from UK or POSSII Schmidt Plates scanned at the Automated Plate Measuring facility in Cambridge. Low resolution (~> 10A) spectra were obtained to identify the quasars, primarily at the Las Campanas Observatory. The highest redshift quasar in our survey is at z ~ 4.8 (R = 18.7) and its spectrum shows a damped Lyman-alpha absorption system at z = 4.46. This is currently the highest redshift damped Lyman-alpha absorber detected. Five of these quasars exhibit intrinsic broad absorption line features. Combined with the previously published results from the first part of the APM UKST survey we have now surveyed a total of ~8000 squ deg of sky i.e. 40% of the high galactic latitude (|b|>30 deg) sky, resulting in 59 optically selected quasars in the redshift range 3.85 to 4.78; 49 of which have z>=4.00.
description: to appear in MNRAS, 14 pages, 5 figures (figures 1 and 2 are large)
Strong field limit analysis of gravitational retro-lensing
Creators: name: Eiroa, Ernesto F.
name: Torres, Diego F.
Publisher: name: arXiv
Year: 2003
Subjects: subject: General Relativity and Quantum Cosmology (gr-qc)
subject: Astrophysics (astro-ph)
subject: FOS: Physical sciences

description: We present a complete treatment in the strong field limit of gravitational retro-lensing by a static spherically symmetric compact object having a photon sphere. The results are compared with those corresponding to ordinary lensing in similar strong field situations. As examples of application of the formalism, a supermassive black hole at the galactic center and a stellar mass black hole in the galactic halo are studied as retro-lenses, in both cases using the Schwarzschild and Reissner-Nordstrom geometries.
description: 11 pages, 1 figure; v2: minor changes. Accepted for publication in Physical Review D
Testing the formation of Majorana states using the Majorana Polarization
Creators: name: Bena, Cristina
Publisher: name: arXiv
Year: 2017
Subjects: subject: Superconductivity (cond-mat.supr-con)
subject: Mesoscale and Nanoscale Physics (cond-mat.mes-hall)
subject: FOS: Physical sciences

description: We study the formation of Majorana states in superconductors using the Majorana polarization, which can locally evaluate the Majorana character of a given state. We introduce the definition of the Majorana polarization vector and the corresponding criterion to identify a Majorana state, and we apply it to some simple cases such as a one-dimensional wire with spin-orbit coupling, subject to a Zeeman magnetic field, and proximitized by a superconductor, as well as to an NS junction made with such a wire. We also apply this criterion to two-dimensional finite-size strips and squares subject to the same physical conditions. Our analysis demonstrates the necessity of using the Majorana polarization local order parameter to characterize the Majorana states, particularly in finite-size systems.
description: 16 pages, 11 figures, review article published in Comptes Rendus Physique
A New Stimulation Methodology for Extraction of Natural Gas from Deep and Tight Geological Formations
Creators: name: WANNIARACHCHILLAGE AYAL MANETH WANNIARACHCHI
Publisher: name: Monash University
Year: 2018
Subjects: subject: 90501 Civil Geotechnical Engineering
subject: FOS: Civil engineering

description: This thesis investigates a new stimulation technique to extract natural gases from reservoir ‎rocks, that considers the fracture characteristics as well as the permeability of the rocks. The ‎technique discussed in this thesis involves the use of a foam-based fluid, which is a more ‎environmentally friendly alternative when compared with conventional fracturing fluids such ‎as water. The thesis has pragmatic outcomes, that may contribute to the knowledge of ‎petroleum industry.‎
Energy Exascale Earth System Model (E3SM)
Creators: name: E3SM Project
name: Sreepathi, Sarat
Publisher: name: figshare
Year: 2018
Subjects: Climate Science

description: The Energy Exascale Earth System Model (E3SM) is a state-of-the-art fully coupled model of the Earth's climate that is intended to address the most challenging and demanding climate-change research problems and Department of Energy mission needs while efficiently using DOE Leadership Computing Facilities.

Note: This poster was presented at ORNL Software Expo, May 15-17, 2018.
Numerical Analysis of Magnetic Field Amplification by Turbulence
Creators: name: Chou, Hongsong
Publisher: name: arXiv
Year: 2000
Subjects: subject: Astrophysics (astro-ph)
subject: FOS: Physical sciences

description: We apply a Fourier spectral numerical method to 3D incompressible MHD turbulence with a magnetic Prandtl number $Pr \geq 1$. We examine the processes by which an initially weak, large-scale seed magnetic field and an initially weak, small-scale, impulse-like seed magnetic field are amplified. We find that in both cases the magnetic energy spectrum grows at all scales. The growth rates at different amplification stages are analyzed. For a large-scale seed magnetic field, the magnetic energy density grows as $\sim t^2$ for the first few turbulence eddy turnover times, followed by a dynamic growth stage, where nonlinear interactions between different scales of the turbulence contribute to an exponential growth rate that is largely determined by the turbulence eddy turnover time. For a seed magnetic field that is initially set up at a small scale in the turbulence, during the kinematic development stage, the growth rate of magnetic energy is $\propto 1/τ_{max}$, where $τ_{max}$ is the eddy turnover time of the smallest eddies of the turbulence. The kinematic growth stage is followed by a dynamic growth stage, where nonlinearity plays important role. During such dynamic growth stage, the growth rate of total magnetic energy is determined by both the magnetic energy amplification within the turbulence inertial range and that within the turbulence dissipation range.
description: 41 pages, 12 figures, to be published in ApJ (vol. 556)
Nonexistence of certain singly even self-dual codes with minimal shadow
Creators: name: Bouyuklieva, Stefka
name: Harada, Masaaki
name: Munemasa, Akihiro
Publisher: name: arXiv
Year: 2017
Subjects: subject: Combinatorics (math.CO)
subject: FOS: Mathematics
subject: 94B05

description: It is known that there is no extremal singly even self-dual $[n,n/2,d]$ code with minimal shadow for $(n,d)=(24m+2,4m+4)$, $(24m+4,4m+4)$, $(24m+6,4m+4)$, $(24m+10,4m+4)$ and $(24m+22,4m+6)$. In this paper, we study singly even self-dual codes with minimal shadow having minimum weight $d-2$ for these $(n,d)$. For $n=24m+2$, $24m+4$ and $24m+10$, we show that the weight enumerator of a singly even self-dual $[n,n/2,4m+2]$ code with minimal shadow is uniquely determined and we also show that there is no singly even self-dual $[n,n/2,4m+2]$ code with minimal shadow for $m \ge 155$, $m \ge 156$ and $m \ge 160$, respectively. We demonstrate that the weight enumerator of a singly even self-dual code with minimal shadow is not uniquely determined for parameters $[24m+6,12m+3,4m+2]$ and $[24m+22,12m+11,4m+4]$.
description: 16 pages
title: EelTrace Life history traits and migration behaviour of European Eel The effects of habitat choice on eel spawner quality
Creators: name: Zumholz, Karsten
name: Jakob, Eva
name: Hanel, Reinhold
Publisher: name: ASC 2006 - Theme session J
Year: 2024
Subjects: Fisheries and aquaculture
Ecosystem observation, processes and dynamics

description: No abstracts are to be cited without prior reference to the author.Recent research has indicated that the quality of the European eel spawners escaping from the continent might be seriously impaired by pollution, diseases and parasites. In a new attempt we combine life history information as revealed by otolith microchemistry with detailed information on the individual health status of silver eels. Investigated parameters include parasite infestation, viral infections, contamination with heavy metals and organic pollutants. For the reconstruction of migration pathways of fish, their otolith chemistry is analysed by two advanced methods, namely LA-MC-ICPMS (laser ablation-multi collector-inductively coupled plasma mass spectrometry) and SYXRF (Synchrotron x-ray Fluorescence) microprobe analysis. Both techniques, primarily used for material science and earth sciences, provide outstanding possibilities for trace element analyses of biomineralized tissues. The micro-scale resolution combined with extremely low detection limits makes both techniques very accurate tools to gather life history information of individual eels from their otoliths. Not only the differentiation between residence in freshwater and seawater, but also between different river systems via isotopic fingerprints seems possible.
Robust Estimation Using Modified Huber’s Functions With New Tails
Creators: name: Yunlu Jiang
name: You-Gan Wang
name: Fu, Liya
name: Xueqin Wang
Publisher: name: Taylor & Francis
Year: 2018
Subjects: subject: Molecular Biology
subject: 59999 Environmental Sciences not elsewhere classified
subject: FOS: Earth and related environmental sciences
subject: 69999 Biological Sciences not elsewhere classified
subject: FOS: Biological sciences
subject: 19999 Mathematical Sciences not elsewhere classified
subject: FOS: Mathematics

description: It is traditionally believed that robustness is obtained by sacrificing efficiency. Estimators with high breakdown point and high efficiency are therefore highly desirable. We investigate a new estimation procedure based on Huber’s robust approach, but with tail functions replaced by the exponential squared loss. The tuning parameters are data-dependent to achieve high efficiency even in nonnormal cases. In the regression framework, we show that our hybrid estimator is of high efficiency, reaching the highest asymptotic breakdown point of 50%. We have also established the n-consistency and asymptotic normality of our estimator under regularity conditions. Extensive numerical studies are carried out to compare the performances of our method and other existing methods in terms of the standard errors and relative efficiency, and the results reveal that the newly proposed method has smaller standard errors and higher relative efficiency than its competitors when the sample size is sufficiently large. Finally, we present three real examples for demonstration. Supplementary materials for the article are available online.
Stability criterion for self-similar solutions with a scalar field and those with a stiff fluid in general relativity
Creators: name: Harada, Tomohiro
name: Maeda, Hideki
Publisher: name: arXiv
Year: 2003
Subjects: subject: General Relativity and Quantum Cosmology (gr-qc)
subject: Astrophysics (astro-ph)
subject: FOS: Physical sciences

description: A stability criterion is derived in general relativity for self-similar solutions with a scalar field and those with a stiff fluid, which is a perfect fluid with the equation of state $P=ρ$. A wide class of self-similar solutions turn out to be unstable against kink mode perturbation. According to the criterion, the Evans-Coleman stiff-fluid solution is unstable and cannot be a critical solution for the spherical collapse of a stiff fluid if we allow sufficiently small discontinuity in the density gradient field in the initial data sets. The self-similar scalar-field solution, which was recently found numerically by Brady {\it et al.} (2002 {\it Class. Quantum. Grav.} {\bf 19} 6359), is also unstable. Both the flat Friedmann universe with a scalar field and that with a stiff fluid suffer from kink instability at the particle horizon scale.
description: 15 pages, accepted for publication in Classical and Quantum Gravity, typos corrected
title: ADCO, Cartulaire de Cîteaux pour le prieuré de Gilly : rachat de la rente due à Saint-Germain-des-Prés (c. 1501), Cart. 194 (11 H 636), 64 folios, f. 0069
Creators: name: de la Côte d'Or, Archives départementales
name: Petot, Frédéric
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 le prieuré de Gilly : rachat de la rente due à Saint-Germain-des-Prés (c. 1501), Archives départementales de la Côte-d'Or, Cart. 194 (11 H 636), 64 folios, f. 0069, Numérisation en mode image.
description: Relation: http://www.cbma-project.eu/
description: Bibliographic citation: Cartulaire de Cîteaux pour le prieuré de Gilly : rachat de la rente due à Saint-Germain-des-Prés (c. 1501), Archives départementales de la Côte-d'Or, Cart. 194 (11 H 636), 64 folios, f. 0069, in Projet CBMA - Corpus Burgundiae Medii Aevi [Ressource en ligne], https:// manuscrits.cbma-project.eu/
description: Provenance: abbaye de Cîteaux
description: Provenance: http://www.wikidata.org/entity/Q843261
description: Provenance: https://www.geonames.org/3024876
description: Provenance: http://www.idref.fr/030974844/id
description: Provenance: https://catalogue.bnf.fr/ark:/12148/cb12228351v
YOG'DA ERIYDIGAN VITAMINLAR VA ULARNING VAZIFALARI
Creators: name: Sadikova, Mashhura
name: Farmonova, Shaxlo
name: Baxtiyorova, Xumora
Publisher: name: Zenodo
Year: 2024

description: Yog'da eriydigan vitaminlar tarqatadigan va yog'da saqlanadigan moddalardir. A, D, E va K vitaminlari yog'da eriydigan vitaminlardir. Karotenoidlar (masalan, beta-karotin) kabi ba'zi phytonutrientslar ham yog'da eriydi. Bu moddalar to'qimalarni to'g'ri saqlashni ta'minlash, shuningdek, normal tana funktsiyalari va o'sishi uchun zarur. Yog'da eriydigan vitaminlar organizmning yog'li to'qimalarida va jigarda saqlanadi. A, D, E va K vitaminlari yog'da eriydi. Ular suvda eriydigan vitaminlarga qaraganda osonroqdir va ular organizmda kunlar, ba'zan esa oylar uchun saqlanishi mumkin.Yog'da eriydigan vitaminlar yog'lar yoki lipidlar yordamida ichak trakti orqali so'riladi.
Analytic predictions for nuclear shapes, the prolate dominance and the prolate-oblate shape transition in the proxy-SU(3) model
Creators: name: Bonatsos, Dennis
name: Assimakis, I. E.
name: Minkov, N.
name: Martinou, Andriana
name: Sarantopoulou, S.
name: Cakirli, R. B.
name: Casten, R. F.
name: Blaum, K.
Publisher: name: arXiv
Year: 2017
Subjects: subject: Nuclear Theory (nucl-th)
subject: FOS: Physical sciences

description: Using a new approximate analytic parameter-free proxy-SU(3) scheme, we make simple predictions of shape observables for deformed nuclei, namely gamma and beta deformation variables, the global feature of prolate dominance and the locus of the prolate-oblate shape transition. The predictions are compared with empirical results.
description: 14 pages, 6 figures, 4 tables
A Bell's Inequality Test with Entangled Atoms
Creators: name: Beige, Almut
name: Munro, William J.
name: Knight, Peter L.
Publisher: name: arXiv
Year: 2000
Subjects: subject: Quantum Physics (quant-ph)
subject: FOS: Physical sciences

description: Previous work on Bell's inequality realised in the laboratory has used entangled photons. Here we describe how entangled atoms can violate Bell's inequality, and how these violations can be measured with a very high detection efficiency. We first discuss a simple scheme based on two-level atoms inside a cavity to prepare the entangled state. We then discuss a scheme using four-level atoms, which requires a parameter regime much easier to access experimentally using current technology. As opposed to other schemes, our proposal relies on the presence of finite decay rates and its implementation should therefore be much less demanding.
description: 9 pages, 5 figures, Section III describing how to suppress spontaneous emission during the state preparation has been replaced with a revised version to correct an error
Large-$N_c$ operator analysis of hyperon-nucleon interactions in SU(3) chiral effective field theory
Creators: name: Liu, Xuyang
name: Limkaisang, Viroj
name: Samart, Daris
name: Yan, Yupeng
Publisher: name: arXiv
Year: 2017
Subjects: subject: High Energy Physics - Phenomenology (hep-ph)
subject: Nuclear Theory (nucl-th)
subject: FOS: Physical sciences

description: We study octet-octet baryon ($J^P = {\textstyle \frac12}^+$) contact interactions in SU(3) chiral effective field theory by using large-$N_c$ operator analysis. Applying the $1/N_c$ expansion of the Hartee Hamiltonian, we find 15 operators in the octet-octet baryon potential where 4 operators for leading order (LO) and 11 for and net-to-next-to-leading order (NNLO). The large-$N_c$ operator analysis of octet-octet baryon matrix elements reduces the number of free parameters from 15 to 6 at LO of the $1/N_c$ expansion. The application of large-$N_c$ sum rules to the Jülich model of hyperon-nucleon (YN) interactions at the LO of the chiral expansion reduces the model parameters to 3 from 5 at the LO of $1/N_c$ expansion. We find that the values of LECs fitted to YN scattering data in Ref. \cite{Li:2016paq} in the relativistic covariant ChEFT (EG) approach is more consistent with the predictions of large-$N_c$ than in the heavy baryon (HB) formalism approach.
description: 12 pages, 2 tables
Robust Estimation Using Modified Huber's Functions With New Tails
Creators: name: Yunlu Jiang
name: You-Gan Wang
name: Fu, Liya
name: Xueqin Wang
Publisher: name: Taylor & Francis
Year: 2018
Subjects: subject: Molecular Biology
subject: 59999 Environmental Sciences not elsewhere classified
subject: FOS: Earth and related environmental sciences
subject: Sociology
subject: FOS: Sociology
subject: 69999 Biological Sciences not elsewhere classified
subject: FOS: Biological sciences
subject: 19999 Mathematical Sciences not elsewhere classified
subject: FOS: Mathematics

description: It is traditionally believed that robustness is obtained by sacrificing efficiency. Estimators with high breakdown point and high efficiency are therefore highly desirable. We investigate a new estimation procedure based on Huber's robust approach, but with tail functions replaced by the exponential squared loss. The tuning parameters are data-dependent to achieve high efficiency even in non-normal cases. In the regression framework, we show that our hybrid estimator iss of high efficiency, reaching the highest asymptotic breakdown point of 50%. We have also established the n-consistency and asymptotic normality of our estimator under regularity conditions. Extensive numerical studies are carried out to compare the performances of our method and other existing methods in terms of the standard errors and relative efficiency, and the results reveal that the newly proposed method has smaller standard errors and higher relative efficiency than its competitors when the sample size is sufficiently large. Finally, we present three real examples for demonstration.
Anomalous random correlations of force constants on the lattice dynamical properties of disordered Au-Fe alloys
Creators: name: Kangsabanik, Jiban
name: Chouhan, Rajiv K.
name: Johnson, D. D.
name: Alam, Aftab
Publisher: name: arXiv
Year: 2017
Subjects: subject: Materials Science (cond-mat.mtrl-sci)
subject: FOS: Physical sciences

description: Au-Fe alloys are of immense interest due to their biocompatibility, anomalous hall conductivity, and applications in various medical treatment. However, irrespective of the method of preparation, they often exhibit a high-level of disorder, with properties sensitive to the thermal or magnetic annealing temperatures. We calculate lattice dynamical properties of Au$_{1-x}$Fe$_x$ alloys using density functional theory methods, where, being a multisite property, reliable interatomic force constant (IFC) calculations in disordered alloys remain a challenge. We follow a two fold approach: (1) an accurate IFC calculation in an environment with nominally zero chemical pair correlations to mimic the homogeneously disordered alloy; and (2) a configurational averaging for the desired phonon properties (e.g., dispersion, density of states, and entropy). We find an anomalous change in the IFC's and phonon dispersion (split bands) near $x$=0.19, which is attributed to the local stiffening of the Au-Au bonds when Au is in the vicinity of Fe. Other results based on mechanical and thermo-physical properties reflect a similar anomaly: Phonon entropy, e.g., becomes negative below $x$=0.19, suggesting a tendency for chemical unmixing, reflecting the onset of miscibility gap in the phase diagram. Our results match fairly well with reported data, wherever available.
X-ray variability of AGN and correlations with spectral properties
Creators: name: Nandra, K.
Publisher: name: arXiv
Year: 2000
Subjects: subject: Astrophysics (astro-ph)
subject: FOS: Physical sciences

description: Rapid flux changes in the X-ray emission from active galactic nuclei are commonly observed. The power-density spectra show a pseudo power-law form with a turnover at low frequencies and a high frequency break, similar to galactic black-hole candidates. There have been a few claims for periodicities but these are not a well-established property of the class. The amplitude of variability depends on a number of source parameters, including luminosity and spectral properties. The variability amplitude is correlated with X-ray spectral index, and anti-correlated with the width of the permitted optical lines. In one particularly well-observed case, NGC 7469, we see a relationship between the X-ray and UV variability, which indicates that the dominant emission process for the X-rays is thermal Comptonization. Variations in the X-ray emission are related to changes in the UV seed photons, but it appears there must also be a mechanism - perhaps that which heats the Comptonizing corona - that induces rapid variability intrinsic to the X-rays.
description: 12 pages, 6 figures, to appear in Advances in Space Research
title: ADCO, Comptes du Petit-Cîteaux (1477-1491) (11 H 1179), f. 00248
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: Corpus Burgundiae Medii Aevi
subject: Chartes de la Bourgogne du Moyen Âge
subject: cartulaire
subject: comptes
subject: LaMOP
subject: Laboratoire de Médiévistique Occidentale de Paris

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. 00248, in Projet CBMA - Corpus Burgundiae Medii Aevi [Ressource en ligne], https://manuscrits.cbma-project.eu/
description: Provenance: abbaye de Cîteaux
description: Provenance: http://www.wikidata.org/entity/Q843261
description: Provenance: https://www.geonames.org/3024876
description: Provenance: http://www.idref.fr/030974844/id
description: Provenance: https://catalogue.bnf.fr/ark:/12148/cb12228351v
5-Dimensional Kaluza-Klein Theory with a Source
Creators: name: Ma, Yongge
name: Wu, Jun
Publisher: name: arXiv
Year: 2003
Subjects: subject: General Relativity and Quantum Cosmology (gr-qc)
subject: High Energy Physics - Theory (hep-th)
subject: FOS: Physical sciences

description: A free test particle in 5-dimensional Kaluza-Klein spacetime will show its electricity in the reduced 4-dimensional spacetime when it moves along the fifth dimension. In the light of this observation, we study the coupling of a 5-dimensional dust field with the Kaluza-Klein gravity. It turns out that the dust field can curve the 5-dimensional spacetime in such a way that it provides exactly the source of the electromagnetic field in the 4-dimensional spacetime after the dimensional reduction.
description: 8 pages, three references added
Open star clusters in the Milky Way - Comparison of photometric and trigonometric distance scales based on Gaia TGAS data
Creators: name: Kovaleva, Dana A.
name: Piskunov, Anatoly E.
name: Kharchenko, Nina V.
name: Röser, Siegfried
name: Schilbach, Elena
name: Scholz, Ralf-Dieter
name: Reffert, Sabine
name: Yen, Steffi X.
Publisher: name: arXiv
Year: 2017
Subjects: subject: Solar and Stellar Astrophysics (astro-ph.SR)
subject: Astrophysics of Galaxies (astro-ph.GA)
subject: FOS: Physical sciences

description: The global survey of star clusters in the Milky Way (MWSC) is a comprehensive list of 3061 objects that provides, among other parameters, distances to clusters based on isochrone fitting. The Tycho-Gaia Astrometric Solution (TGAS) catalogue, which is a part of Gaia data release 1 (Gaia DR1), delivers accurate trigonometric parallax measurements for more than 2 million stars, including those in star clusters. We compare the open cluster photometric distance scale with the measurements given by the trigonometric parallaxes from TGAS to evaluate the consistency between these values. The average parallaxes of probable cluster members available in TGAS provide the trigonometric distance scale of open clusters, while the photometric scale is given by the distances published in the MWSC. Sixty-four clusters are suited for comparison as they have more than 16 probable members with parallax measurements in TGAS. We computed the average parallaxes of the probable members and compared these to the photometric parallaxes derived within the MWSC. We find a good agreement between the trigonometric TGAS-based and the photometric MWSC-based distance scales of open clusters, which for distances less than 2.3 kpc coincide at a level of about 0.1 mas with no dependence on the distance. If at all, there is a slight systematic offset along the Galactic equator between $30^\circ$ and $160^\circ$ galactic longitude.
description: Accepted for publication as a Letter in Astronomy and Astrophysics, 4 pages, 4 figures
Colors of 2625 Quasars at 0
Creators: name: Richards, Gordon T.
name: Fan, Xiaohui
name: Schneider, Donald P.
name: Berk, Daniel E. Vanden
name: Strauss, Michael A.
name: York, Donald G.
Publisher: name: arXiv
Year: 2000
Subjects: subject: Astrophysics (astro-ph)
subject: FOS: Physical sciences

description: We present an empirical investigation of the colors of quasars in the Sloan Digital Sky Survey (SDSS) photometric system. The sample studied includes 2625 quasars with SDSS photometry. The quasars are distributed in a 2.5 degree wide stripe centered on the Celestial Equator covering $\sim529$ square degrees. Positions and SDSS magnitudes are given for the 898 quasars known prior to SDSS spectroscopic commissioning. New SDSS quasars represent an increase of over 200% in the number of known quasars in this area of the sky. The ensemble average of the observed colors of quasars in the SDSS passbands are well represented by a power-law continuum with $α_ν = -0.5$ ($f_ν \propto ν^α$). However, the contributions of the $3000 {\rm Å}$ bump and other strong emission lines have a significant effect upon the colors. The color-redshift relation exhibits considerable structure, which may be of use in determining photometric redshifts for quasars. The range of colors can be accounted for by a range in the optical spectral index with a distribution $α_ν=-0.5\pm0.65$ (95% confidence), but there is a red tail in the distribution. This tail may be a sign of internal reddening. Finally, we show that there is a continuum of properties between quasars and Seyfert galaxies and we test the validity of the traditional division between the two classes of AGN.
description: 66 pages, 15 figures (3 color), accepted by AJ
Structure of the density matrix providing the minimum of generalized uncertainty relation for mixed states
Creators: name: Karelin, M. U.
name: Lazaruk, A. M.
Publisher: name: arXiv
Year: 2000
Subjects: subject: Quantum Physics (quant-ph)
subject: Optics (physics.optics)
subject: FOS: Physical sciences

description: For configurational space of arbitrary dimension a strict form of the uncertainty principle has been obtained, which takes into account the dependence of inequality limit on the effective number of pure states present in given statistical mixture. It is shown that in a state with minimal uncertainty the density operators eigenfunctions coincide with the stationary wavefunctions of a multidimensional harmonic oscillator. The mixed state obtained has a permutational symmetry which is typical for a system of identical bosons.
description: 11 pages, 3 figures, LaTeX 2e with IOP format file (included), submitted to J. Phys. A, also was presented at International Conference on Quantum Optics (Raubichi, Belarus, May 28-31, 2000)
Efficient method for estimating the number of communities in a network
Creators: name: Riolo, Maria A.
name: Cantwell, George T.
name: Reinert, Gesine
name: Newman, M. E. J.
Publisher: name: arXiv
Year: 2017
Subjects: subject: Social and Information Networks (cs.SI)
subject: Physics and Society (physics.soc-ph)
subject: FOS: Computer and information sciences
subject: FOS: Physical sciences

description: While there exist a wide range of effective methods for community detection in networks, most of them require one to know in advance how many communities one is looking for. Here we present a method for estimating the number of communities in a network using a combination of Bayesian inference with a novel prior and an efficient Monte Carlo sampling scheme. We test the method extensively on both real and computer-generated networks, showing that it performs accurately and consistently, even in cases where groups are widely varying in size or structure.
description: 13 pages, 4 figures
Early dust evolution in protostellar accretion disks
Creators: name: Suttner, Gerhard
name: Yorke, Harold W.
Publisher: name: arXiv
Year: 2000
Subjects: subject: Astrophysics (astro-ph)
subject: FOS: Physical sciences

description: We investigate dust dynamics and evolution during the formation of a protostellar accretion disk around intermediate mass stars via 2D numerical simulations. Using three different detailed dust models, compact spherical particles, fractal BPCA grains, and BCCA grains, we find that even during the early collapse and the first 10,000 yr of dynamical disk evolution, the initial dust size distribution is strongly modified. Close to the disk's midplane coagulation produces dust particles of sizes of several 10 micons (for compact spherical grains) up to several mm (for fluffy BCCA grains), whereas in the vicinity of the accretion shock front (located several density scale heights above the disk), large velocity differences inhibit coagulation. Dust particles larger than about 1 micron segregate from the smaller grains behind the accretion shock. Due to the combined effects of coagulation and grain segregation the infrared dust emission is modified. Throughout the accretion disk a MRN dust distribution provides a poor description of the general dust properties. Estimates of the consequences of the "freezing out" of molecules in protostellar disks should consider strongly modified grains. Physical model parameters such as the limiting sticking strength and the grains' resistivity against shattering are crucial factors determining the degree of coagulation reached. In dense regions (e.g. in the mid-plane of the disk) a steady-state is quickly attained. High above the equatorial plane coagulation equilibrium is not reached due to the much lower densities. Here, the dust size distribution is affected primarily by differential advection, rather than coagulation.
description: 24 pages, 16 figures, to appear in ApJ 550 (2001)
Experimental observation of nonclassical effects on single-photon detection rates
Creators: name: Resch, K. J.
name: Lundeen, J. S.
name: Steinberg, A. M.
Publisher: name: arXiv
Year: 2000
Subjects: subject: Quantum Physics (quant-ph)
subject: FOS: Physical sciences

description: It is often asserted that quantum effects can be observed in coincidence detection rates or other correlations, but never in the rate of single-photon detection. We observe nonclassical interference in a singles rate, thanks to the intrinsic nonlinearity of photon counters. This is due to a dependence of the effective detection efficiency on the quantum statistics of the light beam. Such measurements of detector response to photon pairs promise to shed light on the microscopic aspects of silicon photodetectors, and on general issues of quantum measurement and decoherence.
description: 8 pages, 4 figures
Gravitational waveforms from a point particle orbiting a Schwarzschild black hole
Creators: name: Martel, Karl
Publisher: name: arXiv
Year: 2003
Subjects: subject: General Relativity and Quantum Cosmology (gr-qc)
subject: FOS: Physical sciences

description: We numerically solve the inhomogeneous Zerilli-Moncrief and Regge-Wheeler equations in the time domain. We obtain the gravitational waveforms produced by a point-particle of mass $μ$ traveling around a Schwarzschild black hole of mass M on arbitrary bound and unbound orbits. Fluxes of energy and angular momentum at infinity and the event horizon are also calculated. Results for circular orbits, selected cases of eccentric orbits, and parabolic orbits are presented. The numerical results from the time-domain code indicate that, for all three types of orbital motion, black hole absorption contributes less than 1% of the total flux, so long as the orbital radius r_p(t) satisfies r_p(t)> 5M at all times.
description: revtex4, 24 pages, 23 figures, 3 tables, submitted to PRD
La parlèsia: un’indagine sociolinguistica sul gergo dei musicisti napoletani
Creators: name: Maffia, Marta
name: Malcangi, Luigi Augusto
Publisher: name: ATeM Archiv für Textmusikforschung
Year: 2018

description: Spoken in the nineteenth century by the posteggiatori, the wandering minstrels of Naples, parlèsia is a jargon. It shares its syntax and its phonology with the Neapolitan dialect and is characterized by a special lexicon of about 200 words, referring above all to money, women, and music. Parlèsia has been a secret code until the 1950s when Neapolitan pop artists used expressions of the jargon in their music. The results of a sociolinguistic investigation conducted among 150 musicians in Naples demonstrate that parlèsia is still being understood and spoken although today it seems more like a form of youth slang than a code of a marginalised group of speakers.
description: Archivi Testo e Musica, No 2
title: A review of the status of European eel stocks in north west Europe
Creators: name: Knights, Brian
name: Bark, Tony
name: Williams, Beth
Publisher: name: ASC 2006 - Theme session J
Year: 2024
Subjects: Fisheries and aquaculture
Ecosystem observation, processes and dynamics

description: No abstracts are to be cited without prior reference to the author.Reviews of glass eel monitoring information in NW Europe show there have been marked declines over recent decades, but no comparably detailed studies of available data have been made on the status of stocks of yellow and silver eels and their relationships to recruitment. This study collated and analysed a wide range of stock dataset types covering suitable timescales. The size of the database, including fishery-independent studies and fishery monitoring CPUEs, helped counterbalance biases in data spreads and possible inaccuracies. Of 54 datasets, only 37% showed significant declines in stock density or CPUEs, 7% showed significant increases. Fifteen time series that showed significant declines over 1970-2005 were analysed further. Inter-annual variability was high but the mean stock index appeared to decline between 1980 and 2005 by about 95%. However, this occurred from a peak of about 50% above the long term mean and indices were also relatively low in the early-1970s. Further analysis of two time series of 43 and 84 years duration revealed decadal-scale patterns that suggest recent stock levels are not abnormally low compared to historical ones. Differences in trends appear to exist between the N Sea and Baltic areas. Evidence reviewed suggests long-term trends in stocks are related to ones in climate and west wind strengths in winter, associated with the NAO. Why stock levels do not show clearer relationships to the magnitude of changes in glass eel recruitment is discussed. Trends in landings are analysed and it appears that economic factors were important in driving changes in the 1960s and that since the mid-1980s, competition from farmed eels and declines in catch values in real terms have impacted on fishing effort and hence landings, to the extent that the economic viability of some fisheries is now threatened. It is concluded that care needs to be taken in assuming that landings are representative of stock levels, especially if such data are used in stock-recruitment and related modelling. Pragmatic implications of the findings are discussed with respect to monitoring, the development of predictive models and in determining the ‘pristine’ status for stocks, in the context of the precautionary principle, the Data Collection Regulations and the formulation of Eel Management Plans.
Proposal for the Measurement of Bell-like Correlations from Continuous Variables
Creators: name: Ralph, T. C.
name: Munro, W. J.
name: Polkinghorne, R. E. S.
Publisher: name: arXiv
Year: 2000
Subjects: subject: Quantum Physics (quant-ph)
subject: FOS: Physical sciences

description: We show theoretically that Bell-type correlations can be observed between continuous variable measurements performed on a parametric source. An auxiliary measurement, performed on the detection environment, negates the possibility of constructing a local realistic description of these correlations.
A skeleton approximate solution of the Einstein field equations for multiple black-hole systems
Creators: name: Faye, G.
name: Jaranowski, P.
name: Schaefer, G.
Publisher: name: arXiv
Year: 2003
Subjects: subject: General Relativity and Quantum Cosmology (gr-qc)
subject: FOS: Physical sciences

description: An approximate analytical and non-linear solution of the Einstein field equations is derived for a system of multiple non-rotating black holes. The associated space-time has the same asymptotic structure as the Brill-Lindquist initial data solution for multiple black holes. The system admits an Arnowitt-Deser-Misner (ADM) Hamiltonian that can particularly evolve the Brill-Lindquist solution over finite time intervals. The gravitational field of this model may properly be referred to as a skeleton approximate solution of the Einstein field equations. The approximation is based on a conformally flat truncation, which excludes gravitational radiation, as well as a removal of some additional gravitational field energy. After these two simplifications, only source terms proportional to Dirac delta distributions remain in the constraint equations. The skeleton Hamiltonian is exact in the test-body limit, it leads to the Einsteinian dynamics up to the first post-Newtonian approximation, and in the time-symmetric limit it gives the energy of the Brill-Lindquist solution exactly. The skeleton model for binary systems may be regarded as a kind of analytical counterpart to the numerical treatment of orbiting Misner-Lindquist binary black holes proposed by Gourgoulhon, Grandclement, and Bonazzola, even if they actually treat the corotating case. Along circular orbits, the two-black-hole skeleton solution is quasi-stationary and it fulfills the important property of equality of Komar and ADM masses. Explicit calculations for the determination of the last stable circular orbit of the binary system are performed up to the tenth post-Newtonian order within the skeleton model.
description: 15 pages, 1 figure, submitted to Phys. Rev. D, 3 references added, minor corrections
title: Eels : contaminant cocktails pinpointing environmental contamination
Creators: name: Belpaire, Claude
name: Goemans, Geert
Publisher: name: ASC 2006 - Theme session J
Year: 2024
Subjects: Fisheries and aquaculture
Ecosystem observation, processes and dynamics

description: No abstracts are to be cited without prior reference to the author.Recently some scientific evidence has indicated that insufficient quality of the silver eels leaving the continental waters for migrating to the spawning areas might be a key factor explaining the overall decline of the stock. High contaminant accumulation in the eel and poor physiological condition might be responsible for failure of migration and/or impairment of successful reproduction. During a 12-year study on a relatively small area within the river basins of Ijzer, Scheldt and Meuse (ca 13 500 km²) 2 613 eels were harvested covering a dense monitoring network of 357 stations. Eels sampled were analysed for a series of ca 100 chemicals. These include PCBs, organochlorine pesticides, heavy metals, brominated flame retardants, volatile organic pollutants (VOCs), endocrine disruptors, dioxins, perfluorooctane sulfonic acids (PFOSs), metallothionines and polycyclic aromatic compounds. This series represents only a very small fraction (less then 0.5 %) of the more then 30 000 chemicals currently marketed and used in Europe. Two major conclusions can be drawn. The indicator value of eel as a tool for monitoring environmental contamination, both for local matters and for international issues (evaluating the chemical status for the Water Framework Directive) is evident. Considering the variation in contaminant profile and intensity it is highly probable that the degree and potential of reproduction for eels leaving our system will vary a lot dependent on the level of pollution in the habitat where the eels grew up.
Simulating the WFIRST coronagraph Integral Field Spectrograph
Creators: name: Rizzo, Maxime J.
name: Groff, Tyler D.
name: Zimmerman, Neil T.
name: Gong, Qian
name: Mandell, Avi M.
name: Saxena, Prabal
name: McElwain, Michael W.
name: Roberge, Aki
name: Krist, John
name: Riggs, AJ Eldorado
name: Cady, Eric J.
name: Prada, Camilo Mejia
name: Brandt, Timothy D.
name: Douglas, Ewan
name: Cahoy, Kerri
Publisher: name: arXiv
Year: 2017
Subjects: subject: Instrumentation and Methods for Astrophysics (astro-ph.IM)
subject: FOS: Physical sciences

description: A primary goal of direct imaging techniques is to spectrally characterize the atmospheres of planets around other stars at extremely high contrast levels. To achieve this goal, coronagraphic instruments have favored integral field spectrographs (IFS) as the science cameras to disperse the entire search area at once and obtain spectra at each location, since the planet position is not known a priori. These spectrographs are useful against confusion from speckles and background objects, and can also help in the speckle subtraction and wavefront control stages of the coronagraphic observation. We present a software package, the Coronagraph and Rapid Imaging Spectrograph in Python (crispy) to simulate the IFS of the WFIRST Coronagraph Instrument (CGI). The software propagates input science cubes using spatially and spectrally resolved coronagraphic focal plane cubes, transforms them into IFS detector maps and ultimately reconstructs the spatio-spectral input scene as a 3D datacube. Simulated IFS cubes can be used to test data extraction techniques, refine sensitivity analyses and carry out design trade studies of the flight CGI-IFS instrument. crispy is a publicly available Python package and can be adapted to other IFS designs.
description: 15 pages