cometadata/datacite-rtg-text-other-reclassification-records huggingface dataset:
Additional file 2: of Mapping QTL for white striping in relation to breast muscle yield and meat quality traits in broiler chickens
Creators: name: Pampouille, Eva
name: CĂŠcile Berri
name: Boitard, Simon
name: Hennequet-Antier, Christelle
name: StĂŠphane Beauclercq
name: Godet, Estelle
name: Praud, Christophe
name: JĂŠgo, Yves
name: Bihan-Duval, Elisabeth Le
Publisher: name: figshare
Year: 2018
Subjects: subject: Cell Biology
subject: Genetics
subject: FOS: Biological sciences
subject: Pharmacology
subject: Ecology
subject: 69999 Biological Sciences not elsewhere classified
subject: 80699 Information Systems not elsewhere classified
subject: FOS: Computer and information sciences
subject: Science Policy
subject: Computational Biology

description: Figure S2. Gene environment of the region of interest for WS on GGA1. The first track corresponds to the chromosome 1 where the region of interest is indicated by a red line. The second track corresponds to the genomic axis for the region of interest. The third track corresponds to the gene model based on GalGal5 assembly. The last track corresponds to the Manhattan plot of the region of interest where the orange line represents the chromosome threshold and the most significant SNP for WS is highlighted in red. (PDF 8 kb)
Domain-Based Fuzzing for Supervised Learning of Anomaly Detection in Cyber-Physical Systems (Appendix)
Creators: name: Wijaya, Herman
name: Aniche, Mauricio
name: Mathur, Aditya
Publisher: name: Zenodo
Year: 2020
Subjects: fuzzing, domain testing, security, cyber physical system, supervised learning, anomaly detection.

description: Appendix for Domain-Based Fuzzing for Supervised Learning of Anomaly Detection in Cyber-Physical Systems - ICSE EnCyCriS 2020 Workshop Paper
description: This work is supported by the National Research Foundation, Singapore under its National Satellite of Excellence in Design Science and Technology for Secure Critical Infrastructure programme (NSoE DeST-SCI) (Award No. NRF2018NCR-NSOE005-0001).
Number variance of random zeros on complex manifolds
Creators: name: Shiffman, Bernard
name: Zelditch, Steve
Publisher: name: arXiv
Year: 2006
Subjects: subject: Complex Variables (math.CV)
subject: Algebraic Geometry (math.AG)
subject: Probability (math.PR)
subject: FOS: Mathematics

description: We show that the variance of the number of simultaneous zeros of $m$ i.i.d. Gaussian random polynomials of degree $N$ in an open set $U \subset C^m$ with smooth boundary is asymptotic to $N^{m-1/2} ν_{mm} Vol(\partial U)$, where $ν_{mm}$ is a universal constant depending only on the dimension $m$. We also give formulas for the variance of the volume of the set of simultaneous zeros in $U$ of $k
description: Some computations are simplified and positivity of the coefficient of the leading term in the variance formula is shown for all codimensions. This article is a follow-up to math/0512652, which dealt with zero sets of codimension one. The original posting (v1) also contains results on smooth linear statistics and on random holomorphic functions on noncompact manifolds
Juncus effusus Linnaeus, 1753, spec. nov.
Creators: name: Linnaeus, Carolus
Publisher: name: Laurentius Salvius
Year: 1753
Subjects: Biodiversity
Taxonomy
Plantae
Tracheophyta
Liliopsida
Poales
Juncaceae
Juncus
Juncus effusus

description: Juncus effusus, spec. nov.
 3. Juncus culmo nudo stricto: panicula laterali. Roy. lugdb. 44. Fl. suec. 279.
 α. Juncus culmo nudo acuminato ad basin squamato, floribus sessilibus. Fl. lapp. 116. Hall. helv. 254.
 Juncoides alpinum, flosculis junci glomeratis atrofuscis. Scheuch. hist. 323.
 β. Juncus culmo nudo acuminato ad basin squamato, floribus pedunculatis. Fl. lapp. 117. Gron. virg. 38.
 Juncus laevis, panicula sparsa, major. Bauh. pin. 12. theatr. 182. Scheuch. gram. 341.
 Juncus laevis. Dod. pempt. 606.
 Habitat in Europae uliginosis, α in alpibus. ♃
description: Published as part of Linnaeus, Carolus, 1753, Species plantarum: exhibentes plantas rite cognitas, ad genera relatas, cum differentiis specificis, nominibus trivialibus, synonymis selectis, locis natalibus, secundum systema sexuale digestas, Stockholm :Laurentius Salvius on page 326, DOI: 10.5281/zenodo.3931989
Theory of Coupled Resonator Optical Waveguides (CROW) Exhibiting High Order Exceptional Points of Degeneracy
Creators: name: Nada, Mohamed Y.
name: Othman, Mohamed A. K.
name: Capolino, Filippo
Publisher: name: arXiv
Year: 2017
Subjects: subject: Optics (physics.optics)
subject: FOS: Physical sciences

description: We present a novel approach and a theoretical framework for generating high order exceptional points of degeneracy (EPD) in photonic structures based on periodic coupled resonators optical waveguides (CROWs). Such EPDs involve the coalescence of Floquet-Bloch eigenwaves in CROWs, without the presence of gain and loss, which is in contrast to the requirement of Parity-Time (PT) symmetry to develop exceptional points based on gain and loss balance. The EPDs arise here by introducing symmetry breaking in a conventional chain of coupled resonators through coupling the chain of resonators to an adjacent uniform optical waveguide, which leads to unique modal characteristics that cannot be realized in conventional CROWs. Such remarkable characteristics include high quality factors (Q-factor) and strong field enhancement, even without any mirrors at the two ends of a cavity. We show for the first time the capability of CROWs to exhibit EPDs of various order; including the degenerate band edge (DBE) and the stationary inflection point (SIP). The proposed CROW of finite length shows enhanced quality factor when operating near the DBE, and the Q-factor exhibits an anomalous scaling with the CROW's length. We develop the theory of EPDs in such unconventional CROW using coupled-wave equations, and we derive an analytical expression for the dispersion relation. The proposed unconventional CROW concepts have various potential applications including Q-switching, nonlinear devices, lasers, and extremely sensitive sensors.
description: 16 pages, 11 figures
Juncus inflexus Linnaeus, 1753, spec. nov.
Creators: name: Linnaeus, Carolus
Publisher: name: Laurentius Salvius
Year: 1753
Subjects: Biodiversity
Taxonomy
Plantae
Tracheophyta
Liliopsida
Poales
Juncaceae
Juncus
Juncus inflexus

description: Juncus inflexus, spec. nov.
4. Juncus culmo nudo: apice membranaceo incurvo, panicula laterali.
 Juncus culmo nudo, paniculam arcuatim tegente. Sauv. monsp. 9.
 Juncus, acumine reflexo, major. Bauh. pin. 12. prodr. 184. Moris. hist.3. p.233. s.8. t.10. f.25. Barr. ic. 204. Hall. helv. 252.
 Juncus, acumine reflexo, alter. Bauh. pin. 12. prodr. 22. Scheuch. gram. 345.
 γ. Juncus panicula universali laterali culmo longiore, secundariis sparsis. Guett. stamp. 412.
 Juncus acutus, panicula sparsa. Bauh. pin. 412.
 Habitat in Europa australi. ♃
description: Published as part of Linnaeus, Carolus, 1753, Species plantarum: exhibentes plantas rite cognitas, ad genera relatas, cum differentiis specificis, nominibus trivialibus, synonymis selectis, locis natalibus, secundum systema sexuale digestas, Stockholm :Laurentius Salvius on page 326, DOI: 10.5281/zenodo.3931989
SBS 0335-052, a probable nearby young dwarf galaxy: evidence pro and con
Creators: name: Izotov, Yu. I.
name: Lipovetsky, V. A.
name: Chaffee, F.
name: Foltz, C.
name: Guseva, N. G.
name: Kniazev, A. Yu.
Publisher: name: arXiv
Year: 1996
Subjects: subject: Astrophysics (astro-ph)
subject: FOS: Physical sciences

description: The results of Multiple Mirror Telescope spectrophotometry of the extremely low-metallicity blue compact galaxy (BCG) SBS 0335-052 are presented. The oxygen abundance in central brightest part of the galaxy is found to be 12 + log(O/H) = 7.33+-0.01. The N/O, Ne/O, S/O and Ar/O abundance ratios are close to those derived in other BCGs, suggesting that heavy element enrichment in the HII region is due to massive star evolution. We detect auroral [OIII] 4363 emission in the inner part of HII region with a diameter of 3.6 kpc and find that the HII region inside this diameter is hot, T_e~20000K. The oxygen abundance in this region is nearly constant (12 + log(O/H) = 7.1 - 7.3), implying effective mixing of ionized gas on short time-scales. We also discuss the origin of blue underlying extended low-intensity emission detected in SBS 0335-052. The (V-I) and (R-I) color distributions suggest that a significant contribution to the extended envelope is due to ionized gas emission. However, the observed equivalent width of Hbeta emission in the extended envelope is 2-3 times lower than the value expected in the case of pure gaseous emission. These findings suggest that, along with the blue young (~10^7yr) stellar clusters, an older stellar population with age ~10^8yr may be present in the extended envelope of SBS 0335-052, having a total mass conclude that SBS 0335-052 is a young nearby dwarf galaxy with age ~10^8 yr.
description: 27 pages and 8 Postscript figures, uses aaspp4.sty. Submitted to Astrophysical Journal
Juncus filiformis Linnaeus, 1753, spec. nov.
Creators: name: Linnaeus, Carolus
Publisher: name: Laurentius Salvius
Year: 1753
Subjects: Biodiversity
Taxonomy
Plantae
Tracheophyta
Liliopsida
Poales
Juncaceae
Juncus
Juncus filiformis

description: Juncus filiformis, spec. nov.
 5. Juncus culmo nudo filiformi nutante, panicula laterali. Roy. lugdb. 44. Gron. virg. 152. Fl. suec. 280.
 Juncus parvus, calamo supra paniculam longius producto. Raj. angl. 3. p.432. Fl. lapp. 118.
 Juncus laevis, panicula sparsa, minor. Bauh. pin. 12. theatr. 183. Scheuch. gram. 347. t.7. f.1.
 Habitat in Europae uliginoso-paludosis turfosis. ♃
description: Published as part of Linnaeus, Carolus, 1753, Species plantarum: exhibentes plantas rite cognitas, ad genera relatas, cum differentiis specificis, nominibus trivialibus, synonymis selectis, locis natalibus, secundum systema sexuale digestas, Stockholm :Laurentius Salvius on page 326, DOI: 10.5281/zenodo.3931989
New results from a number operator interpretation of the compositeness of bound and resonant states
Creators: name: Oller, J. A.
Publisher: name: arXiv
Year: 2017
Subjects: subject: High Energy Physics - Phenomenology (hep-ph)
subject: High Energy Physics - Lattice (hep-lat)
subject: High Energy Physics - Theory (hep-th)
subject: Nuclear Theory (nucl-th)
subject: FOS: Physical sciences

description: A novel theoretical approach to the problem of the compositeness ($X$) of a resonance or bound state is developed on the basis of the expectation values of the number operators of the free particles in the continuum. This formalism is specially suitable for effective field theories in which the bare elementary states are integrated out but that give rise to resonance and bound states when implemented in nonperturbative calculations. We demonstrate that $X=1$ for finite-range energy-independent potentials, either regular or singular. A non-trivial example for an energy-dependent potential is discussed where it is shown that $X$ is independent of any type of cutoff regulator employed. The generalization of these techniques to relativistic states is developed. We also explain how to obtain a meaningful compositeness with respect to the open channels for resonances, even if it is complex in a first turn, by making use of suitable phase-factor transformations. Defining elementariness as $X=0$, we derive a new universal criterion for the elementariness of a bound state. Along the same lines, a necessary condition for a resonance to be qualified as elementary is given. The application of the formalism here developed might be of considerable practical interest.
description: 35 pages, 4 figures. To match the published version
MOESM3 of Water-splitting-based, sustainable and efficient H2 production in green algae as achieved by substrate limitation of the Calvin–Benson–Bassham cycle
Creators: name: Nagy, Valéria
name: Podmaniczki, Anna
name: Vidal-Meireles, André
name: Tengölics, Roland
name: Kovács, László
name: Rákhely, Gábor
name: Scoma, Alberto
name: Tóth, Szilvia
Publisher: name: figshare
Year: 2018
Subjects: subject: Biochemistry
subject: Space Science
subject: Medicine
subject: 59999 Environmental Sciences not elsewhere classified
subject: FOS: Earth and related environmental sciences
subject: 39999 Chemical Sciences not elsewhere classified
subject: FOS: Chemical sciences
subject: Ecology
subject: FOS: Biological sciences
subject: Sociology
subject: FOS: Sociology
subject: 69999 Biological Sciences not elsewhere classified
subject: Inorganic Chemistry
subject: Plant Biology
subject: Computational Biology

description: Additional file 3: Table S1. The percentage of CO2 in the headspaces of sealed cultures of Chlamydomonas cultures subjected to dark anaerobic incubation of 4 h in HS medium followed by continuous illumination of 320 µmol photons/m2/s, as determined using gas chromatography. Mean values (± SEM in parentheses) are each based on 4–6 biological replicates. bld: below detection limit of 0.01%.
59 squadron, Coastal Command, sinking of Uboat 844 on 16 October 1943
Creators: name: Project Team, Their Finest Hour
Publisher: name: University of Oxford
Year: 2024
Subjects: classificationCode: 430304
subject: British history
classificationCode: 430308
subject: European history (excl. British, classical Greek and Roman)
classificationCode: 430316
subject: International history

description: My father, Rod Pike, was the navigator of Liberator TR-S of 59 Squadron, piloted by P/O Thomas, escorting Convoy ON206. They attacked two U Boats with depth charges and machine gun fire resulting in the sinking of U844. The aircraft was hot by ack ack fire and one engine was u/s. This is recorded in his logbook [image attached] where he has noted later that the details are in the book "Autumn of the U Boats". Also attached is a photo of the crew and a copy of a local news cutting.
Domain-Based Fuzzing for Supervised Learning of Anomaly Detection in Cyber Physical Systems (Appendix)
Creators: name: Wijaya, Herman
name: Aniche, Mauricio
name: Mathur, Aditya
Publisher: name: Zenodo
Year: 2020

description: Appendix for Domain-Based Fuzzing for Supervised Learning of Anomaly Detection in Cyber Physical Systems - ICSE EnCyCriS 2020 Workshop Paper
Padé approximants and analytic continuation of Euclidean Phi-derivable approximations
Creators: name: Markó, Gergely
name: Reinosa, Urko
name: Szép, Zsolt
Publisher: name: arXiv
Year: 2017
Subjects: subject: High Energy Physics - Phenomenology (hep-ph)
subject: High Energy Physics - Theory (hep-th)
subject: FOS: Physical sciences

description: We investigate the Padé approximation method for the analytic continuation of numerical data and its ability to access, from the Euclidean propagator, both the spectral function and part of the physical information hidden in the second Riemann sheet. We test this method using various benchmarks at zero temperature: a simple perturbative approximation as well as the two-loop Phi-derivable approximation. The analytic continuation method is then applied to Euclidean data previously obtained in the O(4) symmetric model (within a given renormalization scheme) to assess the difference between zero-momentum and pole masses, which is in general a difficult question to answer within nonperturbative approaches such as the Phi-derivable expansion scheme.
description: 20 pages, 8 figures, uses RevTeX 4-1
The Infrared to Gamma-Ray Pulse Shape of the Crab Nebula Pulsar
Creators: name: Eikenberry, Stephen S.
name: Fazio, Giovanni G.
Publisher: name: arXiv
Year: 1996
Subjects: subject: Astrophysics (astro-ph)
subject: FOS: Physical sciences

description: We analyze the pulse shape of the Crab Nebula pulsar in the near-infrared, optical, ultraviolet, X-ray, and gamma-ray bands, including previously unpublished ROSAT HRI observations. We show that, in addition to the previously known trend for the fluences of the Bridge and Peak 2 to increase with energy relative to the fluence of Peak 1, there is a small but statistically significant trend for both to decrease with energy relative to Peak 1 over the near-infrared range. We find that the phase separation between the two peaks of the pulse profile decreases nearly continuously as a function of energy over 7 decades of energy. We show that the peaks' full-width half-maxima are significantly variable over this energy range, but without any clear pattern to the variability. We find that the differences between the energy dependences of the leading and trailing edge half-width half-maxima of both peaks found by Eikenberry et al. (1996a) also continue over 7 decades of energy. We show that the cusped shape of Peak 2 reverses direction between the infrared/optical and X-ray/gamma-ray bands, while the cusped shape of Peak 1 shows weak evidence of reversing direction between the X-ray and gamma-ray bands. Finally, we find that many of the pulse shape parameters show maxima or minima at energies of 0.5-1 eV, implying that an important change in the pulsar emission is occuring near this energy. Many of these complex phenomena are not predicted by current pulsar emission models, and offer new challenges for the development of such models.
description: 32 pages; 9 figures
pham_supplementary_2nd_revision
Creators: name: Pham, Van Dong
name: González, César
name: Dappe, Yannick
name: Dong, Chengye
name: Robinson, Joshua
name: Trampert, Achim
name: Engel-Herbert, Roman
Publisher: name: AIP Publishing
Year: 2024
Subjects: classificationCode: 51
subject: Physical sciences
subject: FOS: Physical sciences

description: Supplementary Materials
Juncus trifidus Linnaeus, 1753, spec. nov.
Creators: name: Linnaeus, Carolus
Publisher: name: Laurentius Salvius
Year: 1753
Subjects: Biodiversity
Taxonomy
Plantae
Tracheophyta
Liliopsida
Poales
Juncaceae
Juncus
Juncus trifidus

description: Juncus trifidus, spec. nov.
 6. Juncus culmo nudo, foliis floribusque tribus terminalibus. Fl. lapp. 119. Fl. suec. 281. Roy. lugdb. 43. Hall. helv. 253.
 Juncus, acumine reflexo, minor & trifidus. Bauh. pin. 12. prodr. 22. t.22. theatr. 186.
 Juncoides alpinum trifidum. Scheuch. gram. 325.
 Habitat in Alpibus Lapponicis , Helveticis , Pyrenaeis . ♃
description: Published as part of Linnaeus, Carolus, 1753, Species plantarum: exhibentes plantas rite cognitas, ad genera relatas, cum differentiis specificis, nominibus trivialibus, synonymis selectis, locis natalibus, secundum systema sexuale digestas, Stockholm :Laurentius Salvius on pages 326-327, DOI: 10.5281/zenodo.3931989
Juncus squarrosus Linnaeus, 1753, spec. nov.
Creators: name: Linnaeus, Carolus
Publisher: name: Laurentius Salvius
Year: 1753
Subjects: Biodiversity
Taxonomy
Plantae
Tracheophyta
Liliopsida
Poales
Juncaceae
Juncus
Juncus squarrosus

description: Juncus squarrosus, spec. nov.
 7. Juncus culmo nudo, foliis setaceis, capitulis glomeratis aphyllis. Fl. suec. 282.
 Juncus foliis setaceis, culmo nudo, capitulis glomeratis terminalibus. Roy. lugdb. 44.
 Juncus montanus palustris. Raj. hist. 1303. Fl. lapp. 121.
 Gramen junceum, foliis & spica junci. Bauh. pin. 5.
 Gramen junceum, semine acuminato. Loes. pruss. 15. t. 29.
 Habitat in Europae borealis sespitosis. ♃    * Culmis foliosis.
description: Published as part of Linnaeus, Carolus, 1753, Species plantarum: exhibentes plantas rite cognitas, ad genera relatas, cum differentiis specificis, nominibus trivialibus, synonymis selectis, locis natalibus, secundum systema sexuale digestas, Stockholm :Laurentius Salvius on page 327, DOI: 10.5281/zenodo.3931989
The NuSTAR Serendipitous Survey: Hunting for The Most Extreme Obscured AGN at >10 keV
Creators: name: Lansbury, G. B.
name: Alexander, D. M.
name: Aird, J.
name: Gandhi, P.
name: Stern, D.
name: Koss, M.
name: Lamperti, I.
name: Ajello, M.
name: Annuar, A.
name: Assef, R. J.
name: Ballantyne, D. R.
name: Balokovic, M.
name: Bauer, F. E.
name: Brandt, N.
name: Brightman, M.
name: Chen, C. -T. J.
name: Civano, F.
name: Comastri, A.
name: Moro, A. D.
name: Fuentes, C.
name: Harrison, F. A.
name: Marchesi, S.
name: Masini, A.
name: Mullaney, J. R.
name: Ricci, C.
name: Saez, C.
name: Tomsick, J. A.
name: Treister, E.
name: Walton, D. J.
name: Zappacosta, L.
Publisher: name: arXiv
Year: 2017
Subjects: subject: High Energy Astrophysical Phenomena (astro-ph.HE)
subject: Astrophysics of Galaxies (astro-ph.GA)
subject: FOS: Physical sciences

description: We identify sources with extremely hard X-ray spectra (i.e., with photon indices of Gamma<0.6 in the 13 sq. deg. NuSTAR serendipitous survey, to search for the most highly obscured AGNs detected at >10 keV. Eight extreme NuSTAR sources are identified, and we use the NuSTAR data in combination with lower energy X-ray observations (from Chandra, Swift XRT, and XMM-Newton) to characterize the broad-band (0.5-24 keV) X-ray spectra. We find that all of the extreme sources are highly obscured AGNs, including three robust Compton-thick (CT; N_H > 1.5e24 cm^-2) AGNs at low redshift (z<0.1), and a likely-CT AGN at higher redshift (z=0.16). Most of the extreme sources would not have been identified as highly obscured based on the low energy (<10 keV) X-ray coverage alone. The multiwavelength properties (e.g., optical spectra and X-ray/MIR luminosity ratios) provide further support for the eight sources being significantly obscured. Correcting for absorption, the intrinsic rest-frame 10-40 keV luminosities of the extreme sources cover a broad range, from ~ 5 x 10^42 to 10^45 erg s^-1. The estimated number counts of CT AGNs in the NuSTAR serendipitous survey are in broad agreement with model expectations based on previous X-ray surveys, except for the lowest redshifts (z<0.07) where we measure a high CT fraction of f_CT^obs = 30 (+16 -12) %. For the small sample of CT AGNs, we find a high fraction of galaxy major mergers (50 +/- 33%) compared to control samples of "normal" AGNs.
description: 19 pages, 15 figures, 5 tables; Accepted for publication in ApJ; Author list updated
title: ADCO, Cartulaire général de Cîteaux, dit de Jean de Cirey, (XVe siècle), tome V, Cart. 189 (11 H 74), 316 folios, f. 0221r
Creators: name: de la Côte d'Or, Archives départementales
name: Archives Départementales De La Côte-D'Or
name: Petot, Frédérique
name: Projet CBMA
name: CG21/F.PETOT/2012
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: cartulaire
subject: Corpus Burgundiae Medii Aevi
subject: Chartes de la Bourgogne du Moyen Âge

description: Cartulaire général de Cîteaux, dit de Jean de Cirey, (XVe siècle), tome V, Archives départementales de la Côte-d'Or, Cart. 189 (11 H 74), 316 folios, f. 0221r, Numérisation en mode image.
description: Relation: http://www.cbma-project.eu/
description: Bibliographic citation: Cartulaire général de Cîteaux, dit de Jean de Cirey, (XVe siècle), tome V, Archives départementales de la Côte-d'Or, Cart. 189 (11 H 74), 316 folios, f. 0221r, 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
Additional file 1: of Participantsâ accrual and delivery of HIV prevention interventions among men who have sex with men in sub-Saharan Africa: a systematic review
Creators: name: Nyato, Daniel
name: Evodius Kuringe
name: Drake, Mary
name: Casalini, Caterina
name: Soori Nnko
name: Shao, Amani
name: Komba, Albert
name: Baral, Stefan
name: Mwita Wambura
name: Changalucha, John
Publisher: name: figshare
Year: 2018
Subjects: subject: Medicine
subject: Biotechnology
subject: 69999 Biological Sciences not elsewhere classified
subject: FOS: Biological sciences
subject: 80699 Information Systems not elsewhere classified
subject: FOS: Computer and information sciences
subject: Cancer
subject: Science Policy
subject: Computational Biology

description: A combined search strategy in MEDLINE. This file presents an illustrative search strategy as conducted on MEDLINE database. (DOC 30 kb)
A perturbation analysis of stochastic matrix Riccati diffusions
Creators: name: Bishop, Adrian N.
name: Del Moral, Pierre
name: Niclas, Angele
Publisher: name: arXiv
Year: 2017
Subjects: subject: Probability (math.PR)
subject: Optimization and Control (math.OC)
subject: FOS: Mathematics

description: Matrix differential Riccati equations are central in filtering and optimal control theory. The purpose of this article is to develop a perturbation theory for a class of stochastic matrix Riccati diffusions. Diffusions of this type arise, for example, in the analysis of ensemble Kalman-Bucy filters since they describe the flow of certain sample covariance estimates. In this context, the random perturbations come from the fluctuations of a mean field particle interpretation of a class of nonlinear diffusions equipped with an interacting sample covariance matrix functional. The main purpose of this article is to derive non-asymptotic Taylor-type expansions of stochastic matrix Riccati flows with respect to some perturbation parameter. These expansions rely on an original combination of stochastic differential analysis and nonlinear semigroup techniques on matrix spaces. The results here quantify the fluctuation of the stochastic flow around the limiting deterministic Riccati equation, at any order. The convergence of the interacting sample covariance matrices to the deterministic Riccati flow is proven as the number of particles tends to infinity. Also presented are refined moment estimates and sharp bias and variance estimates. These expansions are also used to deduce a functional central limit theorem at the level of the diffusion process in matrix spaces.
Circumgalactic Oxygen Absorption and Feedback
Creators: name: Mathews, William G.
name: Prochaska, J. Xavier
Publisher: name: arXiv
Year: 2017
Subjects: subject: Astrophysics of Galaxies (astro-ph.GA)
subject: FOS: Physical sciences

description: OVI absorption in quasar spectra caused by intervening circumgalactic atmospheres suggests a downturn in the atmospheric column density in sightlines passing beyond about 100 kpc from central star-forming galaxies. This turnover supports the hypothesis that the oxygen originates in the central galaxies. When converted into oxygen space density using an Abel integral inversion, the OVI columns require greater than $\approx 10^9 M_\odot$ of oxygen concentrated near 100 kpc. Circumgalactic gas within this radius cools in less than 1 Gyr and radiates $\sim 10^{42.2}$ erg s$^{-1}$ overall. The feedback power necessary to maintain such oxygen-rich atmospheres for many Gyrs cannot be easily supplied by galactic supernovae. However, massive central black holes in star-forming galaxies may generate sufficient accretion power and intermittent shock waves at $r \sim 100$ kpc to balance circumgalactic radiation losses in late-type $L^\star$ galaxies. The relative absence of OVI absorption observed in early-type, passive $L^{\star}$ galaxies may arise from enhanced AGN feedback from their more massive central black holes.
description: 5 pages, 4 figures; Accepted to ApJL
HST observations of the blue compact dwarf SBS 0335-052: a probable young galaxy
Creators: name: Thuan, Trinh X.
name: Izotov, Yu. I.
name: Lipovetsky, V. A.
Publisher: name: arXiv
Year: 1996
Subjects: subject: Astrophysics (astro-ph)
subject: FOS: Physical sciences

description: We present HST WFPC2 V and I images and GHRS UV spectrophotometry of the spectral regions around Ly$_alpha$ and OI 1302 of the extremely metal-deficient (Z~Zsun/41) blue compact dwarf (BCD) galaxy SBS 0335-052. All the star formation in the BCD occurs in six super-star clusters (SSC) with ages =< 3-4 Myr. Dust is clearly present and mixed spatially with the SSCs. There is a supershell of radius ~380 pc, delineating a large supernova cavity. The instantaneous star formation rate is ~0.4 Msun yr^-1. Strong narrow Ly$α$ emission is not observed. Rather there is low intensity broad (FWZI = 20 A) Ly$α$ emission superposed on even broader Ly$α$ absorption by the HI envelope. This broad low-intensity emission is probably caused by resonant scattering of Ly$α$ photons. The BCD appears to be a young galaxy, undergoing its very first burst of star formation. This conclusion is based on the following evidence: 1) the underlying extended low-surface-brightness component is very irregular and filamentary, suggesting that a significant part of the emission comes from ionized gas; 2) it has very blue colors (-0.34 =< (V-I)$_0$ =< 0.16), consistent with gaseous emission colors; 3) the OI 1302 line is not detected in absorption in the GHRS spectrum, setting an upper limit for N(O)/N(H) in the HI envelope of the BCD of more than 3000 times smaller than the value in Orion.
description: 20 pages and 6 Postscript figures. Submitted to Astrophysical Journal
Additional file 1: of Awareness of zoonotic diseases and parasite control practices: a survey of dog and cat owners in Qatar
Creators: name: Alho, Ana
name: Lima, Clara
name: Colella, Vito
name: Carvalho, Luís Madeira De
name: Otranto, Domenico
name: Cardoso, Luís
Publisher: name: figshare
Year: 2018
Subjects: subject: Medicine
subject: Cell Biology
subject: Sociology
subject: FOS: Sociology
subject: Cancer
subject: Computational Biology

description: Figure S1. Multiple-choice questionnaire administered to dog and/or cat owners who attended the veterinary medical centres surveyed in the residential centre of Doha. (DOCX 121 kb)
Juncus articulatus Linnaeus, 1753, spec. nov.
Creators: name: Linnaeus, Carolus
Publisher: name: Laurentius Salvius
Year: 1753
Subjects: Biodiversity
Taxonomy
Plantae
Tracheophyta
Liliopsida
Poales
Juncaceae
Juncus
Juncus articulatus

description: Juncus articulatus, spec. nov.
 8. Juncus foliis nodoso-articulatis. Fl. suec. 285.
 Juncus foliis articulosis, panicula inaequali, capitulis sessilibus, capsulis subulatis triquetris. Roy. lugdb. 43.
 Juncus foliis articulosis, floribus umbellatis. Tournef. inst. 247. Fl. lapp. 120.
 Gramen junceum, folio articulato, aquaticum. Bauh. pin. 5. prodr. 12. theatr. 76. Scheuch. gram. 331.
 β. Gramen Junceum, folio articuloso, cum utriculis. Bauh. prodr. 12. Scheuch. gram. 333.
 γ. Juncus alpinus, folio articuloso. Scheuch. gram. 333.
 Gramen junceum, folio articuloso, sylvaticum. Bauh. pin. 5. theatr. 75. Moris. hist.3. p.227. s.8. t.9. f.1. Scheuch. gram. 334.
 δ. Junci foliosi, foliis per siccitatem nodosis. Mich. gen. 38. n. 1. --- 13.
 Habitat in Europae aquosis. ♃
description: Published as part of Linnaeus, Carolus, 1753, Species plantarum: exhibentes plantas rite cognitas, ad genera relatas, cum differentiis specificis, nominibus trivialibus, synonymis selectis, locis natalibus, secundum systema sexuale digestas, Stockholm :Laurentius Salvius on page 327, DOI: 10.5281/zenodo.3931989
On block partial linearizations of the pfaffian
Creators: name: Lopatin, A. A.
Publisher: name: arXiv
Year: 2006
Subjects: subject: Rings and Algebras (math.RA)
subject: FOS: Mathematics
subject: 15A15

description: Amitsur's formula, which expresses det(A+B) as a polynomial in coefficients of the characteristic polynomial of a matrix, is generalized for partial linearizations of the pfaffian of block matrices. As applications, in upcoming papers we determine generators for the SO(n)-invariants of several matrices and relations for the O(n)-invariants of several matrices over a field of arbitrary characteristic.
description: 27 pages; v3. Now numeration of statements in this preprint is the same as in the corresponding paper
องค์ประกอบทางเคมีและแนวโน้มการใช้ประโยชน์จากผลพลอยได้และเศษเหลือทิ้งจากการแปรรูปผลไม้เขตร้อน 4 ชนิด
Creators: name: นรินทร์ เจริญพันธ์
name: ศักดิ์ชัย เศรษฐ์อนวัช
name: สามารถ สายอุต
Publisher: name: กองบริหารการวิจัย
Year: 2563
Subjects: ทุเรียน
มังคุด
เงาะ
ลองกอง

description: วารสารวิทยาศาสตร์และเทคโนโลยี, 28, 1, 113-128
Compact maps and quasi-finite complexes
Creators: name: Cencelj, M.
name: Dydak, J.
name: Smrekar, J.
name: Vavpetic, A.
name: Virk, Z.
Publisher: name: arXiv
Year: 2006
Subjects: subject: Geometric Topology (math.GT)
subject: General Topology (math.GN)
subject: FOS: Mathematics
subject: 54F45, 55M10, 54C65

description: The simplest condition characterizing quasi-finite CW complexes $K$ is the implication $Xτ_h K\implies β(X)τK$ for all paracompact spaces $X$. Here are the main results of the paper: Theorem: If $\{K_s\}_{s\in S}$ is a family of pointed quasi-finite complexes, then their wedge $\bigvee\limits_{s\in S}K_s$ is quasi-finite. Theorem: If $K_1$ and $K_2$ are quasi-finite countable complexes, then their join $K_1\ast K_2$ is quasi-finite. Theorem: For every quasi-finite CW complex $K$ there is a family $\{K_s\}_{s\in S}$ of countable CW complexes such that $\bigvee\limits_{s\in S} K_s$ is quasi-finite and is equivalent, over the class of paracompact spaces, to $K$. Theorem: Two quasi-finite CW complexes $K$ and $L$ are equivalent over the class of paracompact spaces if and only if they are equivalent over the class of compact metric spaces. Quasi-finite CW complexes lead naturally to the concept of $Xτ{\mathcal F}$, where ${\mathcal F}$ is a family of maps between CW complexes. We generalize some well-known results of extension theory using that concept.
description: 20 pages
G-parity breaking in $τ^- \to η^{(\prime)} π^- ν_τ$ decays induced by the $η^{(\prime)}γγ$ form factor
Creators: name: Hernández-Tomé, G.
name: Castro, G. López
name: Roig, P.
Publisher: name: arXiv
Year: 2017
Subjects: subject: High Energy Physics - Phenomenology (hep-ph)
subject: FOS: Physical sciences

description: Breaking of G-parity or new weak (second class) currents can be responsible for $τ^- \to η^{(\prime)} π^- ν_τ$ decays. Forthcoming measurements of $τ$ lepton properties at the Belle II experiment will be able to measure this decay channel for the first time. Isolating new physics contributions from the measured rates will require a careful evaluation of G-parity breaking contributions. Here we evaluate the one-loop contribution to $τ^- \to η^{(\prime)} π^- ν_τ$ decays induced by the emission of two virtual photons and its later conversion into an $η^{(\prime)}$ meson. As expected, this contribution is very small and may be relevant only for new physics searches contributing at the $10^{-4}$ level to the decay rate of $τ^- \to η^{(\prime)} π^- ν_τ$ .
description: 6 pages, 1 figure, Approved for publication in Physical Review D, Appendix with Lengthy expressions can be found in v1
Additional file 1: of Mapping QTL for white striping in relation to breast muscle yield and meat quality traits in broiler chickens
Creators: name: Pampouille, Eva
name: Berri, Cécile
name: Boitard, Simon
name: Hennequet-Antier, Christelle
name: Beauclercq, Stéphane
name: Godet, Estelle
name: Praud, Christophe
name: Jégo, Yves
name: Bihan-Duval, Elisabeth Le
Publisher: name: figshare
Year: 2018
Subjects: subject: Medicine
subject: Genetics
subject: FOS: Biological sciences
subject: Biotechnology
subject: 69999 Biological Sciences not elsewhere classified
subject: 80699 Information Systems not elsewhere classified
subject: FOS: Computer and information sciences
subject: 19999 Mathematical Sciences not elsewhere classified
subject: FOS: Mathematics
subject: Marine Biology
subject: 110309 Infectious Diseases
subject: FOS: Health sciences
subject: Plant Biology

description: Figure S1. Manhattan plot showing the association of SNPs with WS in the pHu + (a) and the pHu- (b) line. Black line represents the 5% genome-wide threshold, red line the 5% GGA1-wide threshold, blue line the 5% GGA17-wide threshold and purple line the 5% GGA20-wide threshold. (DOCX 1204 kb)
กรรมวิธีการเพิ่มประสิทธิภาพในการละลายครีมเทียมผงจากแป้งข้าวด้วยวิธีการทำแห้งแบบลูกกลิ้ง
Creators: name: ธัญญาภรณ์ ศิริเลิศ
name: ณัฏฐิกา ศิลาลาย
name: ธนากรณ์ เชื้อวงษ์ดี
name: ชลธิรา สารวงษ์
Publisher: name: กองบริหารการวิจัย
Year: 2563
Subjects: ครีมเทียม
แป้งข้าว
พรีเจลาติไนซ์
การเพิ่มประสิทธิภาพการละลาย
การทำแห้งแบบลูกกลิ้ง

description: วารสารวิทยาศาสตร์และเทคโนโลยี, 28, 1, 73-85
Spectral shaping with low resolution signals
Creators: name: Jedda, Hela
name: Mezghani, Amine
name: Nossek, Josef A.
Publisher: name: arXiv
Year: 2017
Subjects: subject: Information Theory (cs.IT)
subject: FOS: Computer and information sciences

description: We aim at investigating the impact of low resolution digital-to-analog converters (DACs) at the transmitter and low resolution analog-to-digital converters (ADCs) at the receiver on the required bandwidth and the required signalto- noise ratio (SNR). In particular, we consider the extreme case of only 1-bit resolution (with oversampling), where we propose a single carrier system architecture for minimizing the spectral occupation and the required SNR of 1-bit signals. In addition, the receiver is optimized to take into account the effects of quantization at both ends. Through simulations, we show that despite of the coarse quantization, sufficient spectral confinement is still achievable.
description: Presented in Asilomar Conference on Signals, Systems, and Computers 2015, Pacific Grove, CA
Gravitational Waveguides in Cosmology
Creators: name: Capozziello, Salvatore
name: de Ritis, Ruggiero
name: Mank'o, Vladimir
name: Marino, Alma Angela
name: Marmo, Giuseppe
Publisher: name: arXiv
Year: 1996
Subjects: subject: Astrophysics (astro-ph)
subject: FOS: Physical sciences

description: We discuss the possibility that, besides the usual gravitational lensing, there may exist a sort of gravitational waveguiding in cosmology which could explain some anomalous phenomena which cannot be understood by the current gravitational lensing models as the existence of "brothers" objects having different brilliancy but similar spectra and redshifts posed on the sky with large angular distance. Furthermore, such a phenomena could explain the huge luminosities coming from quasars using the cosmological structures as selfoc-type or planar waveguide. We describe the gravitational waveguide theory and then we discuss possible realizations in cosmology.
description: 14 pages, latex, submitted to Int. Jou. Mod. Phys. D
title: ADCO, Neuvième cartulaire de Saint-Étienne de Dijon (1661 - 1684), Cart. 32 (G 136), 745 folios, f. 0455
Creators: name: de la Côte d'Or, Archives départementales
name: Archives Départementales De La Côte-D'Or
name: Petot, Frédérique
name: Projet CBMA
name: CG21/F.PETOT/2012
name: Petot, Frédéric
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: cartulaire
subject: Corpus Burgundiae Medii Aevi
subject: Chartes de la Bourgogne du Moyen Âge

description: Neuvième cartulaire de Saint-Étienne de Dijon (1661 - 1684), Archives départementales de la Côte-d'Or, Cart. 32 (G 136), 745 folios, f. 0455, Numérisation en mode image.
description: Relation: http://www.cbma-project.eu/
description: Bibliographic citation: Neuvième cartulaire de Saint-Étienne de Dijon (1661 - 1684), Archives départementales de la Côte-d'Or, Cart. 32 (G 136), 745 folios, f. 0455, in Projet CBMA - Corpus Burgundiae Medii Aevi [Ressource en ligne], https:// manuscrits.cbma-project.eu/
description: Provenance: abbaye Saint-Étienne de Dijon
description: Provenance: http://www.wikidata.org/entity/Q15945019
Anisotropic Mesh Adaptation for Finite Element Solution of Anisotropic Porous Medium Equation
Creators: name: Li, Xianping
Publisher: name: arXiv
Year: 2017
Subjects: subject: Numerical Analysis (math.NA)
subject: FOS: Mathematics

description: Anisotropic Porous Medium Equation (APME) is developed as an extension of the Porous Medium Equation (PME) for anisotropic porous media. A special analytical solution is derived for APME for time-independent diffusion. Anisotropic mesh adaptation for linear finite element solution of APME is discussed and numerical results for two dimensional examples are presented. The solution errors using anisotropic adaptive meshes show second order convergence.
description: 18 pages, 13 figures
อิทธิพลของ ZnSO4 ต่อการเจริญเติบโตและสารต้านอนุมูลอิสระในไมโครกรีนผักขี้หูด ผักชีลาว และแมงลัก
Creators: name: พรชัย หาระโคตร
name: ภาณุมาศ ฤทธิไชย
name: สมพงษ์ ทะบันหาร
Publisher: name: กองบริหารการวิจัย
Year: 2563
Subjects: ZnSO4
สารประกอบฟีนอลิค
ฟลาโวนอยด์
ไมโครกรีน

description: วารสารวิทยาศาสตร์และเทคโนโลยี, 28, 1, 86-98
Gauge Invariants, Correlators and Holography in Bosonic and Fermionic Tensor Models
Creators: name: Koch, Robert de Mello
name: Gossman, David
name: Tribelhorn, Laila
Publisher: name: arXiv
Year: 2017
Subjects: subject: High Energy Physics - Theory (hep-th)
subject: FOS: Physical sciences

description: Motivated by the close connection of tensor models to the SYK model, we use representation theory to construct the complete set of gauge invariant observables for bosonic and fermionic tensor models. Correlation functions of the gauge invariant operators in the free theory are computed exactly. The gauge invariant operators close a ring. The structure constants of the ring are described explicitly. Finally, we construct a collective field theory description of the bosonic tensor model.
description: 32+1 pages; v2: refs added, minor typos corrected. v3: matches JHEP version
A Pilgrimage Financial Motives: Lessons to Be Drawn from Tabung Haji Malaysia
Creators: name: Fuad, Nor Amanda Binti Ahmad
Publisher: name: Manara - Qatar Research Repository
Year: 2025
Subjects: classificationCode: 50
subject: Philosophy and religious studies

description: The Islamic pillar of pilgrimage (hajj) requires that millions of Muslims over the world must have a very good financial preparation for their expenses during the performance of this worship. Therefore, the pilgrimage financial motive can be an important consideration of Islamic financial institution that are offer related financial services. Meanwhile, in Malaysia, Tabung Haji (TH) is a well-known Islamic financial institution in term of managing the Malaysian Muslim depositors fund in addition to the overall aspects related to the pilgrimage preparation. Thus, this study aims to find out the main motives of savings by the Malaysian Muslims at Tabung Haji. From the survey conducted, it was revealed that 89% of Tabung Haji depositors have identified hajj preparation as the major reason of saving at TH. This is supported by the survey results whereby 95% of respondents agree on the importance of initial saving for future hajj preparation and 79.3% of them consider the ideal minimum age to start having the TH saving account should start from the earlier age of 1 - 10 years old. Meanwhile, the second and third most popular reasons for saving at TH is the shariah compliance features, and to gain dividend and bonus benefits which accounts 69.9% and 63.5% respectively. These are the main reasons of why 89.5% of respondents agree to maintain their saving account at TH even after performing the hajj. Regarding the challenges faced by TH, it was found that corruption and mismanagement are serious issues that negatively impact TH image. However, one of the best lessons that can be learnt from this institution is, the dedication of higher management in addressing any misconduct arising in TH and providing the relevant strategies to address any problems. In addition, the effective role taken by both government and central bank are the crucial points to recover the performance of TH in the Malaysian Islamic financial industry.
Invariants of quivers under the action of classical groups
Creators: name: Lopatin, A. A.
Publisher: name: arXiv
Year: 2006
Subjects: subject: Representation Theory (math.RT)
subject: FOS: Mathematics
subject: 13A50; 14L24; 16G20

description: We consider a generalization of representations of quivers that can be derived from the ordinary representations of quivers by considering a product of arbitrary classical groups instead of a product of the general linear groups and by considering the dual action of groups on "vertex" vector spaces together with the usual action. A generating system for the corresponding algebra of invariants is found. In particular, a generating system for the algebra of SO(n)-invariants of several matrices is constructed over a field of characteristic different from 2. The proof uses the reduction to semi-invariants of mixed representations of a quiver and the decomposition formula that generalizes Amitsur's formula for the determinant.
description: 41 pages; v2. minor corrections
Juncus bulbosus Linnaeus, 1753, spec. nov.
Creators: name: Linnaeus, Carolus
Publisher: name: Laurentius Salvius
Year: 1753
Subjects: Biodiversity
Taxonomy
Plantae
Tracheophyta
Liliopsida
Poales
Juncaceae
Juncus
Juncus bulbosus

description: Juncus bulbosus, spec. nov.
 9. Juncus foliis linearibus canaliculatis, capsulis obtusis. Fl. suec. 284.
 Juncus foliis linearibus canaliculato-concavis, capsulis triangularibus. Guett. stamp. 134.
 Juncus foliis angulatis, culmo subnudo, panicula terminali prolifera, capsulis ovatis. Roy. lugdb. 43.
 Gramen junceum minimum, capsulis triangularibus. Raj. hist. 1307. angl.3. p.434. Moris. hist.3. p.227. s.8. t.9. f.3.
 Juncus bulbifer, foliis teretibus non articulosis. Mich. gen. 39. n. 1. 2. 3.
 β. Juncoides calycibus paleaceis glomeratis, folio varians. Scheuch. gram. 39.
 Gramen junceum aquaticum, paniculis cum foliis capillaribus simul ortis proliferum. Pluk. alm. 179. t.32. f.3. Moris. hist.3. p.227. s.8. t.9. f.4.
 γ. Juncus foliosus minimus campestris & nemorensis. Gron. virg. 15.
 Gramen junceum elatius, pericarpiis ovatis, americanum. Pluk. alm. 179. t.92. f. 9.
 Gramen junceum virginianum, calyculis paleaceis, bicorne. Moris. hist.3. p.228. s.8. t.9. f.15.
 Habitat in Europae pascuis sterilibus subhumidis, at γ in Sibiria , Virginia .
description: Published as part of Linnaeus, Carolus, 1753, Species plantarum: exhibentes plantas rite cognitas, ad genera relatas, cum differentiis specificis, nominibus trivialibus, synonymis selectis, locis natalibus, secundum systema sexuale digestas, Stockholm :Laurentius Salvius on pages 327-328, DOI: 10.5281/zenodo.3931989
AdditionalÂ fileÂ 5:
Creators: name: Yuhong Li
name: Ren, Qi
name: Lingyan Zhu
name: Yingshu Li
name: Jinfeng Li
name: Yiyang Zhang
name: Guoying Zheng
name: Tiesheng Han
name: Shufeng Sun
name: Fumin Feng
Publisher: name: figshare
Year: 2018
Subjects: subject: Biochemistry
subject: Space Science
subject: Molecular Biology
subject: 69999 Biological Sciences not elsewhere classified
subject: FOS: Biological sciences
subject: Developmental Biology
subject: Computational Biology

description: Figures of pearson correlation analysis. (DOC 917Â kb)
Beyond the standard model with sum rules
Creators: name: Ejlli, Damian
Publisher: name: arXiv
Year: 2017
Subjects: subject: High Energy Physics - Phenomenology (hep-ph)
subject: High Energy Physics - Theory (hep-th)
subject: FOS: Physical sciences

description: The possibility of physics beyond the standard model is studied. The requirement of finiteness of the zero point energy density and pressure or the requirement of the Lorentz invariance of the zero point stress-energy tensor in Minkowski space-time, implies regularization sum rules on the number of degrees of freedom and mass of fundamental particles spectrum. The consequences of these sum rules on the existence of particles beyond the standard model is studied. If these sum rules are to be satisfied, it is shown that some simple and minimal extensions of the standard model such as the two Higgs doublet model, right handed neutrinos, mirror symmetry can not be complete extensions in their current forms. The only exception is unbroken supersymmetry and maybe broken supersymmetry. A comparison between different regularization schemes is also done. It is shown that while all considered regularization schemes give a Lorentz invariant expression for the zero point stress-energy tensor in Minkowski space, their physical interpretations are quite different.
description: With respect to v3, additional references have been added and some typos have been fixed in sec. 7. Version published in International Journal of Modern Physics A