cometadata/datacite-rtg-text-other-reclassification-records huggingface dataset:
Temperature-dependent electronic structure and ferromagnetism in the d=oo Hubbard model studied by a modfied perturbation theory
Creators: name: Wegner, T.
name: Potthoff, M.
name: Nolting, W.
Publisher: name: arXiv
Year: 1997
Subjects: subject: Strongly Correlated Electrons (cond-mat.str-el)
subject: FOS: Physical sciences

description: The infinite-dimensional Hubbard model is studied by means of a modified perturbation theory. The approach reduces to the iterative perturbation theory for weak coupling. It is exact in the atomic limit and correctly reproduces the dispersions and the weights of the Hubbard bands in the strong-coupling regime for arbitrary fillings. Results are presented for the hyper-cubic and an fcc-type lattice. For the latter we find ferromagnetic solutions. The filling-dependent Curie temperature is compared with the results of a recent Quantum Monte Carlo study.
description: RevTeX, 5 pages, 6 eps figures included, Phys. Rev. B (in press), Ref. 16 corrected
Additional file 2 of Development of a predictive nomogram based on preoperative inflammation-nutrition-related markers for prognosis in locally advanced lip squamous cell carcinoma after surgical treatment
Creators: name: Cheng, Hao
name: Xu, Xue-Lian
name: Zhang, Zheng
name: Xu, Jin-Hong
name: Li, Zhuo-Ran
name: Wang, Ya-Nan
name: Zhang, Bo-Dong
name: Chen, Ke
name: Wang, Shou-Yu
Publisher: name: figshare
Year: 2025
Subjects: subject: Medicine
subject: Cell Biology
subject: Genetics
subject: FOS: Biological sciences
subject: Biotechnology
subject: Immunology
subject: FOS: Clinical medicine
subject: Biological Sciences not elsewhere classified
subject: Mathematical Sciences not elsewhere classified
subject: Cancer

description: Supplementary Material 2.
Abarema mataybifolia Barneby & J. W. Grimes
Creators: name: Molino, Jean-François
name: Sabatier, Daniel
name: Grenand, Pierre
name: Engel, Julien
name: Frame, Dawn
name: Delprete, Piero G.
name: Fleury, Marie
name: Odonne, Guillaume
name: Davy, Damien
name: Lucas, Eve J.
name: Martin, Claire A.
Publisher: name: Zenodo
Year: 2022
Subjects: Biodiversity
Taxonomy
Plantae
Tracheophyta
Magnoliopsida
Fabales
Fabaceae
Abarema
Abarema mataybifolia

description: [736] Abarema mataybifolia (Sandwith) Barneby & J.W.Grimes
 Mem. New York Bot. Gard. 74 (1): 78 (Barneby & Grimes 1996). — Pithecellobium mataybifolium Sandwith, Kew Bull. 3 (2): 313 [20 Nov. 1948] (Sandwith 1948).
VERNACULAR NAMES. — Wp: kalaipe’ɨ.
 HERBARIUM DATA (FG). — 20 collections at CAY. Sel. exs.: D. Sabatier 3536.
INVENTORY DATA (FG). — 73 trees in 40 plots; Fmax = 1.1 %; dbhinv = 46.6 cm.
description: Published as part of Molino, Jean-François, Sabatier, Daniel, Grenand, Pierre, Engel, Julien, Frame, Dawn, Delprete, Piero G., Fleury, Marie, Odonne, Guillaume, Davy, Damien, Lucas, Eve J. & Martin, Claire A., 2022, An annotated checklist of the tree species of French Guiana, including vernacular nomenclature, pp. 345-903 in Adansonia (3) (3) 44 (26) on page 504, DOI: 10.5252/adansonia2022v44a26, http://zenodo.org/record/7458777
title: How Long Does It Take You to Pay? A Duration Study of Canadian Retail Transaction Payment Times
Creators: name: Vallée, Geneviève
Publisher: name: Bank of Canada
Year: 2018

description: Using an exclusive data set of payment times for retail transactions made in Canada, I show that cash is the most time-efficient method of payment (MOP) when compared with payments by debit and credit cards. I model payment efficiency using Cox proportional hazard models, accounting for consumer choice of MOP. I propose two instruments to identify and estimate the causal relationship between MOP and payment time: (1) the value of the transaction, and (2) the duration of the payment preceding the one under observation. Discounting consumer selection underestimates the efficiency of cash relative to cards. Overall, the efficiency of MOPs is an important component of the private and social costs of making and accepting payments. The efficiency of cash helps explain its continued use in Canada, which is motivated by its low cost in terms of payment time for consumers and merchants.
description: À l’aide d’un ensemble de données sur la rapidité de paiement en magasin au Canada, je montre qu’il est plus rapide de payer en argent comptant que par carte de crédit ou de débit. Je me sers de modèles à risques proportionnels de Cox pour modéliser l’efficacité des paiements, compte tenu du mode de paiement choisi par le consommateur. Je suggère deux variables pour dégager et estimer la relation causale entre le mode et le temps de paiement : 1) la valeur de la transaction et 2) le temps de paiement de la transaction précédente. Si le choix du consommateur est ignoré, l’efficacité de l’argent est sousestimée par rapport à celle des cartes. L’efficacité des modes de paiement est un élément important des coûts sociaux et privés associés à l’exécution et à l’acceptation des transactions. L’efficacité de l’argent permet d’expliquer son utilisation continue au Canada : son emploi n’entraîne, pour les consommateurs et les marchands, qu’un faible coût en temps de paiement.
A Model for Persistent Levy Motion
Creators: name: Chechkin, A. V.
name: Gonchar, V. Yu.
Publisher: name: arXiv
Year: 1999
Subjects: subject: Statistical Mechanics (cond-mat.stat-mech)
subject: FOS: Physical sciences

description: We propose the model, which allows us to approximate fractional Levy noise and fractional Levy motion. Our model is based (i) on the Gnedenko limit theorem for an attraction basin of stable probability law, and (ii) on regarding fractional noise as the result of fractional integration/differentiation of a white Levy noise. We investigate self - affine properties of the approximation and conclude that it is suitable for modeling persistent Levy motion with the Levy index between 1 and 2.
description: 14 pages, REVTeX, 5 figures PostScript
Additional file 3 of Development of a predictive nomogram based on preoperative inflammation-nutrition-related markers for prognosis in locally advanced lip squamous cell carcinoma after surgical treatment
Creators: name: Cheng, Hao
name: Xu, Xue-Lian
name: Zhang, Zheng
name: Xu, Jin-Hong
name: Li, Zhuo-Ran
name: Wang, Ya-Nan
name: Zhang, Bo-Dong
name: Chen, Ke
name: Wang, Shou-Yu
Publisher: name: figshare
Year: 2025
Subjects: subject: Medicine
subject: Cell Biology
subject: Genetics
subject: FOS: Biological sciences
subject: Biotechnology
subject: Immunology
subject: FOS: Clinical medicine
subject: Biological Sciences not elsewhere classified
subject: Mathematical Sciences not elsewhere classified
subject: Cancer

description: Supplementary Material 3.
title: Blockchain-Based Settlement for Asset Trading
Creators: name: Chiu, Jonathan
name: Koeppl, Thorsten
Publisher: name: Bank of Canada
Year: 2018

description: Can securities be settled on a blockchain and, if so, what are the gains relative to existing settlement systems? We consider a blockchain that ensures delivery versus payment by linking transfers of assets with payments and operates using a proof-of-work protocol. The main benefit of a blockchain is faster and more flexible settlement, whereas the challenge is to avoid settlement fails when participants fork the chain to get rid of trading losses. To deter forking, the blockchain needs to restrict settlement speed through block size and block time to generate sufficient transaction fees, which finance costly mining. We show that large enough trading volume, sufficiently strong preferences for fast settlement and limited trade size and risk are necessary conditions for blockchain-based settlement to be feasible. Despite mining being a deadweight cost, our estimates based on the market for US corporate debt show that gains from moving to faster and more flexible settlement are in the range of 1 to 4 basis points relative to existing legacy settlement systems.
description: Est-il possible de procéder au règlement de titres dans une chaîne de blocs? Dans l’affirmative, quels sont les avantages de la chaîne par rapport aux systèmes de règlement existants? Nous étudions une chaîne de blocs qui assure la livraison contre paiement en liant les transferts d’actifs aux paiements et dont le fonctionnement repose sur un protocole de preuve de travail. Le principal avantage de la chaîne de blocs tient à la plus grande rapidité et à la plus grande souplesse de règlement qu’elle permet. En revanche, le défi est d’éviter les défauts de règlement lorsque les participants créent un embranchement dans la chaîne afin d’éliminer les pertes transactionnelles. Pour empêcher ce phénomène, il faut que la taille et la fréquence des blocs de la chaîne limitent la vitesse de règlement afin de générer des frais de transactions suffisants, lesquels financent le minage, qui est coûteux en soi. Nous montrons que les règlements dans une chaîne de blocs ne sont faisables qu’à trois conditions : le volume de transactions doit être suffisamment important, les préférences pour des règlements rapides doivent être suffisamment marquées, le montant et le risque des transactions doivent être limités. Même si le minage représente une perte sèche, nos estimations, fondées sur le marché des titres d’emprunt de sociétés américaines, montrent que les gains associés à l’adoption d’un système de règlement plus rapide et plus souple sont de l’ordre de un à quatre points de base par rapport aux systèmes déjà en place.
Islands, craters, and a moving surface step on a hexagonally reconstructed (100) noble metal surface
Creators: name: Passerone, D.
name: Ercolessi, F.
name: Tosatti, E.
Publisher: name: arXiv
Year: 2000
Subjects: subject: Materials Science (cond-mat.mtrl-sci)
subject: Statistical Mechanics (cond-mat.stat-mech)
subject: FOS: Physical sciences

description: Deposition/removal of metal atoms on the hex reconstructed (100) surface of Au, Pt and Ir should present intriguing aspects, since a new island implies hex -> square deconstruction of the substrate, and a new crater the square -> hex reconstruction of the uncovered layer. To obtain a microscopic understanding of how islands/craters form in these conditions, we have conducted simulations of island and crater growth on Au(100), whose atomistic behavior, including the hex reconstruction on top of the square substrate, is well described by mean s of classical many-body forces. By increasing/decreasing the Au coverage on Au(100), we find that island/craters will not grow unless they exceed a critical size of about 8-10 atoms. This value is close to that which explains the nonlinear coverage dependence observed in molecular adsorption on the closely related surface Pt (100). This threshold size is rationalized in terms of a transverse step correlation length, measuring the spatial extent where reconstruction of a given plane is disturbed by the nearby step.
description: 11 pages, 5 figures, accepted for publication in Surface Science (ECOSS-18)
Brownian-Vacancy Mediated Disordering Dynamics
Creators: name: Toroczkai, Z.
name: Korniss, G.
name: Schmittmann, B.
name: Zia, R. K. P.
Publisher: name: arXiv
Year: 1997
Subjects: subject: Statistical Mechanics (cond-mat.stat-mech)
subject: FOS: Physical sciences

description: The disordering of an initially phase segregated system of finite size, induced by the presence of highly mobile vacancies, is shown to exhibit dynamic scaling in its late stages. A set of characteristic exponents is introduced and computed analytically, in excellent agreement with Monte Carlo data. In particular, the characteristic time scale, controlling the crossover between increasing disorder and saturation, is found to depend on the exponent scaling the number of vacancies in the sample.
description: 6 pages, typeset using Euro-LaTex, 6 figures, compressed
Spinless Two-Band Model in Infinite Dimensions
Creators: name: Craco, Luis
Publisher: name: arXiv
Year: 1999
Subjects: subject: Strongly Correlated Electrons (cond-mat.str-el)
subject: FOS: Physical sciences

description: A spinless two-band model is studied in infinite dimension limit. Starting from the atomic limit, the formal exact solution of the model is obtained by means a perturbative treatment of the hopping and hybridisation terms. The model is solved in closed form in high dimensions assuming no local spin fluctuations. The non-Fermi liquid properties appearing in the metallic phase are analysed through the behaviour of the density of states and the self-energy near the Fermi level.
description: 4 pages, 3 figures, to appear in PRB-Breif Report
Exploring the Spectral Variability of the Ultra-luminous X-ray source M81 X-6 with Suzaku and XMM-Newton
Creators: name: Jithesh, V.
name: Misra, Ranjeev
Publisher: name: arXiv
Year: 2018
Subjects: subject: High Energy Astrophysical Phenomena (astro-ph.HE)
subject: FOS: Physical sciences

description: We present X-ray spectral variability studies of the ultra-luminous X-ray source (ULX) M81 X--6 using {\it Suzaku} and {\it XMM-Newton} observations performed during 2001--2015. The spectra were first fitted by a standard multi-temperature disk and a thermal Comptonization component which revealed spectral variability where the primary distinction is the change in the optical depth of the Comptonizing component, similar to what has been observed for other ULXs. We also fitted the spectra with a general relativistic accretion disk emission and a power-law component and found that it can reproduce a large part but not all of the spectral variability of the source. The parameters for the black hole mass and spin were found to be degenerate, but the high spin and larger mass ($20-100\,\rm M_\odot$) solutions provided near Eddington accretion rates consistent with the assumptions of the model. The spectral variation is found to be driven by accretion rate changes leading to three different spectral classes. Thus, our results suggest the possibility of a dominant relativistic disk emission component for some of the spectral states of the source.
description: Accepted for publication in ApJ, 9 Pages, 4 Tables, 2 Figures
Irreversibility Line in Nb/CuMn Multilayers with a Regular Array of Antidots
Creators: name: Attanasio, C.
name: Di Luccio, T.
name: Mercaldo, L. V.
name: Prischepa, S. L.
name: Russo, R.
name: Salvato, M.
name: Maritato, L.
name: Barbanera, S.
name: Tuissi, A.
Publisher: name: arXiv
Year: 2000
Subjects: subject: Superconductivity (cond-mat.supr-con)
subject: FOS: Physical sciences

description: The transport properties of Nb/CuMn multilayers with a regular array of electron beam lithography obtained antidots have been measured at different temperatures in the presence of external perpendicular magnetic fields. Hysteretical I-V characteristics have been observed which disappear when approaching the upper critical magnetic field curve H_{c2}(T). Comparing these data with other results (Arrhenius plots of resistive transition curves, logV-logI characteristics) we have been able to relate the onset of the hysteresis to the presence of an irreversibility line. We discuss several possible mechanisms to clarify the nature of this line. Among them the most plausible seems to be the vortex melting mainly induced by quantum fluctuations.
description: 8 pages, 11 eps figures, 1 eps table, submitted to Phys. Rev. B
Design and optimization of gastric floating sustained-release mini-tablets of alfuzosin hydrochloride based on a factorial design: in vitro/in vivo evaluation
Creators: name: Gong, Ling
name: Yu, Miao
name: Sun, Yanyan
name: Gao, Ying
name: An, Tong
name: Zou, Meijuan
name: Cheng, Gang
Publisher: name: Taylor & Francis
Year: 2018
Subjects: subject: Biophysics
subject: Biochemistry
subject: Space Science
subject: Medicine
subject: Genetics
subject: FOS: Biological sciences
subject: Pharmacology
subject: Chemical Sciences not elsewhere classified
subject: Biological Sciences not elsewhere classified

description: The purpose of this research was to develop multiple-unit gastric floating mini-tablets and to evaluate the possibility of using these mini-tablets as a delivery system to improve the drug absorption for drugs with a narrow absorption window. Mini-tablets were prepared using hydroxypropyl methylcellulose (HPMC K100M) and carbopol 971P as release retarding agents and sodium bicarbonate (NaHCO3) as gas-forming agent. The properties of the prepared mini-tablets in terms of floating characteristic parameters and in vitro release were evaluated. Furthermore, in vivo gastric retention study in rats and in vivo pharmacokinetic study in rabbits of the optimized formulation were performed. The optimized mini-tablets containing 45% HPMC K100M, 15% stearyl alcohol, 13% carbopol 971P, and 12% NaHCO3 were found to float immediately within 1 min and duration more than 9 h. The in vivo gastric retention study results indicated that the mini-tablets could retain in the stomach for more than 6.67 h. Furthermore, the AUC0−t of the floating mini-tablets (6849.83 ± 753.80 h ng·mL−1) was significantly higher than that of marketed sustained-release tablets XATRAL®XL (4970.16 ± 924.60 h ng·mL−1). All these results illustrated that the gastric floating mini-tablets might be a promising drug delivery system for drugs with a narrow absorption window.
Quantum Tunneling and Phase Transitions in Spin Systems with an Applied Magnetic Field
Creators: name: Lee, S. -Y.
name: Mueller-Kirsten, H. J. W.
name: Park, D. K.
name: Zimmerschied, F.
Publisher: name: arXiv
Year: 1998
Subjects: subject: Condensed Matter (cond-mat)
subject: High Energy Physics - Theory (hep-th)
subject: FOS: Physical sciences

description: Transitions from classical to quantum behaviour in a spin system with two degenerate ground states separated by twin energy barriers which are asymmetric due to an applied magnetic field are investigated. It is shown that these transitions can be interpreted as first- or second-order phase transitions depending on the anisotropy and magnetic parameters defining the system in an effective Lagrangian description.
description: 18 pages, 7 figures
Orthogonal Polynomials in Analytical Method of Solving Differential Equations Describing Dynamics of Multilevel Systems
Creators: name: Savva, V. A.
name: Zelenkov, V. I.
name: Mazurenko, A. S.
Publisher: name: arXiv
Year: 2001
Subjects: subject: Classical Analysis and ODEs (math.CA)
subject: Dynamical Systems (math.DS)
subject: FOS: Mathematics
subject: 33C48; 34C25

description: An effective method to obtain exact analytical solutions of equations describing the coherent dynamics of multilevel systems is presented. The method is based on the usage of orthogonal polynomials, integral transforms and their discrete analogues. All the obtained solutions are expressed by way of special or elementary functions.
description: 8 pages, latex, no figures, see also http://zelenkov.isir.minsk.by/physmath and http://www.geocities.com/amazurenko/papers.html
The single electron R-pump: first experiment
Creators: name: Lotkhov, S. V.
name: Bogoslovsky, S. A.
name: Zorin, A. B.
name: Niemeyer, J.
Publisher: name: arXiv
Year: 2000
Subjects: subject: Mesoscale and Nanoscale Physics (cond-mat.mes-hall)
subject: FOS: Physical sciences

description: We fabricated and tested the single electron R-pump, i.e. a three-junction Al circuit with on-chip Cr resistors. We show that due to the presence of the resistors (R > h/e^2 = 25.8 kOhm), the accuracy of electron transfer in the R-pump can approach the level of 10^-8. Preliminary results of experiment with the R-pump made at PTB are reported.
description: 2 pages, incl. 3 figures
RTNI - A symbolic integrator for Haar-random tensor networks
Creators: name: Fukuda, Motohisa
name: Koenig, Robert
name: Nechita, Ion
Publisher: name: arXiv
Year: 2019
Subjects: subject: Quantum Physics (quant-ph)
subject: High Energy Physics - Theory (hep-th)
subject: Mathematical Physics (math-ph)
subject: Probability (math.PR)
subject: FOS: Physical sciences
subject: FOS: Mathematics

description: We provide a computer algebra package called Random Tensor Network Integrator (RTNI). It allows to compute averages of tensor networks containing multiple Haar-distributed random unitary matrices and deterministic symbolic tensors. Such tensor networks are represented as multigraphs, with vertices corresponding to tensors or random unitaries and edges corresponding to tensor contractions. Input and output spaces of random unitaries may be subdivided into arbitrary tensor factors, with dimensions treated symbolically. The algorithm implements the graphical Weingarten calculus and produces a weighted sum of tensor networks representing the average over the unitary group. We illustrate the use of this algorithmic tool on some examples from quantum information theory, including entropy calculations for random tensor network states as considered in toy models for holographic duality. Mathematica and Python implementations are supplied.
description: Code available (for Mathematica and python) at https://github.com/MotohisaFukuda/RTNI
Universality of the Hohenberg-Kohn functional
Creators: name: Schindlmayr, Arno
Publisher: name: arXiv
Year: 1999
Subjects: subject: Physics Education (physics.ed-ph)
subject: Materials Science (cond-mat.mtrl-sci)
subject: FOS: Physical sciences

description: We comment on a recent article by H. L. Neal [Am. J. Phys. 66, 512 (1998)], in which an analytic expression for the Hohenberg-Kohn functional was derived for one-dimensional two-particle systems with the harmonic interaction. We argue that the functional given by Neal is not exact but really constitutes an approximation in the same spirit as the local-density approximation.
description: 2 pages, RevTeX
Elements for a Theory of Financial Risks
Creators: name: Bouchaud, Jean-Philippe
Publisher: name: arXiv
Year: 1998
Subjects: subject: Condensed Matter (cond-mat)
subject: FOS: Physical sciences

description: Estimating and controlling large risks has become one of the main concern of financial institutions. This requires the development of adequate statistical models and theoretical tools (which go beyond the traditionnal theories based on Gaussian statistics), and their practical implementation. Here we describe three interrelated aspects of this program: we first give a brief survey of the peculiar statistical properties of the empirical price fluctuations. We then review how an option pricing theory consistent with these statistical features can be constructed, and compared with real market prices for options. We finally argue that a true `microscopic' theory of price fluctuations (rather than a statistical model) would be most valuable for risk assessment. A simple Langevin-like equation is proposed, as a possible step in this direction.
description: 22 pages, to appear in `Order, Chance and Risk', Les Houches (March 1998), to be published by Springer/EDP Sciences
Albizia pedicellaris L. Rico
Creators: name: Molino, Jean-François
name: Sabatier, Daniel
name: Grenand, Pierre
name: Engel, Julien
name: Frame, Dawn
name: Delprete, Piero G.
name: Fleury, Marie
name: Odonne, Guillaume
name: Davy, Damien
name: Lucas, Eve J.
name: Martin, Claire A.
Publisher: name: Zenodo
Year: 2022
Subjects: Biodiversity
Taxonomy
Plantae
Tracheophyta
Magnoliopsida
Fabales
Fabaceae
Albizia
Albizia pedicellaris

description: [740] Albizia pedicellaris (DC.) L.Rico
 Novon 9 (4): 555 [winter 1999] (Rico 1999). — Inga pedicellaris DC., Prodr. [A. P.de Candolle] 2: 441 [mid Nov. 1825] (Candolle 1825). — Pithecellobium pedicellare (DC.) Benth., London J.Bot. 3: 219 (Bentham 1844), “ Pithecolobium ”. — Feuilleea pedicellaris (DC.) Kuntze, Revis. Gen. Pl. 1: 188 [5 Nov. 1891] (Kuntze 1891). — Samanea pedicellaris (DC.) Killip, Trop.Woods 63: 4 (Killip 1940). — Macrosamanea pedicellaris (DC.) Kleinhoonte, Fl. Suriname 2 (2): 329 (Kleinhoonte 1940). — Balizia pedicellaris (DC.) Barneby & J.W.Grimes, Mem. New York Bot. Gard. 74 (1): 37 (Barneby & Grimes 1996).
 Mimosa terminalis Vell., Fl. Flumin. Icon. 11: t. 30 [“1827” publ. 29 Oct. 1831] (Vellozo 1831), nom. illeg. hom., non Salisb. (Salisbury 1796). — Feuilleea terminalis Kuntze, Revis. Gen. Pl. 1: 187 [5 Nov. 1891] (Kuntze 1891).
VERNACULAR NAMES. — Pa: avukun-kamwi • Ka: alawata mulelɨ, alesikyɨ’ i • Wp: yapu’ɨ, yapu’ɨpilã • Nt: asao • Cr: bougouni-blan, bwa-makak, bwa-pagód-ti-féy • Fr: bois pagode • Br: apuxiqui, gambui, jurema-branca, mapuxiqui-vermelho, sobreiro.
 HERBARIUM DATA (FG). — 38 collections at CAY. Sel. exs.: L. Barrabé 232.
INVENTORY DATA (FG). — 104 trees in 67 plots; Fmax = 2.3 %; dbhinv = 102.8 cm.
description: Published as part of Molino, Jean-François, Sabatier, Daniel, Grenand, Pierre, Engel, Julien, Frame, Dawn, Delprete, Piero G., Fleury, Marie, Odonne, Guillaume, Davy, Damien, Lucas, Eve J. & Martin, Claire A., 2022, An annotated checklist of the tree species of French Guiana, including vernacular nomenclature, pp. 345-903 in Adansonia (3) (3) 44 (26) on page 505, DOI: 10.5252/adansonia2022v44a26, http://zenodo.org/record/7458777
Additional file 1 of Identification of key genes controlling anthocyanin biosynthesis in the fruits of a bud variety of Tarocco blood-orange
Creators: name: Zhang, Peian
name: Zhao, Quan
name: Song, Yang
name: Jin, Huanchun
name: Liu, Yingyao
name: Hu, Dan
name: Liu, Dongfeng
Publisher: name: figshare
Year: 2025
Subjects: subject: Genetics
subject: FOS: Biological sciences

description: Supplementary Material 1: Figure S1-S12
The first detection of radio recombination lines at cosmological distances
Creators: name: Emig, K. L.
name: Salas, P.
name: de Gasperin, F.
name: Oonk, J. B. R.
name: Toribio, M. C.
name: Rottgering, H. J. A.
name: Tielens, A. G. G. M.
Publisher: name: arXiv
Year: 2018
Subjects: subject: Astrophysics of Galaxies (astro-ph.GA)
subject: FOS: Physical sciences

description: Recombination lines involving high principal quantum numbers populate the radio spectrum in large numbers. Low-frequency (<1 GHz) observations of radio recombination lines (RRLs) primarily from carbon and hydrogen offer a new, if not unique, way to probe cold, largely atomic gas and warm, ionised gas in other galaxies. Furthermore, RRLs can be used to determine the physical state of the emitting regions, such as temperature and density. These properties make RRLs, potentially, a powerful tool of extragalactic ISM physics. At low radio frequencies, its conceivable to detect RRLs out to cosmological distances when illuminated by a strong radio continuum. However, they are extremely faint (tau ~ 1e-3 -- 1e-4) and have so far eluded detection outside of the local universe. With LOFAR observations of the radio quasar 3C 190 (z=1.1946), we aim to demonstrate that the ISM can be explored out to great distances through low-frequency RRLs. We report the detection of RRLs in the frequency range 112--163 MHz in the spectrum of 3C 190. Stacking 13 a-transitions with principal quantum numbers n=266-301, a peak 6sigma feature of optical depth, tau(peak) = (1.0 +\- 0.2) x 1e-3 and FWHM = 31.2 +/- 8.3 km/s was found at z=1.124. This corresponds to a velocity offset of -9965 km/s with respect to the systemic redshift of 3C 190. We consider three interpretations of the origin of the RRL emission: an intervening dwarf-like galaxy, an AGN-driven outflow, and the inter-galactic medium. We argue that the RRLs most likely originate in a dwarf-like galaxy (M ~ 1e9 Msun) along the line of sight, although we cannot rule out an AGN-driven outflow. We do find the RRLs to be inconsistent with an inter-galactic medium origin. With this detection, we have opened up a new way to study the physical properties of cool, diffuse gas out to cosmological distances.
description: 5 figures, 2 tables and 9 pages. This paper is part of the LOFAR surveys data release 1 and has been accepted for publication in a special edition of A&A that will appear in Feb 2019, volume 622. The catalogues and images from the data release will be publicly available on lofar-surveys.org upon publication of the journal
title: Price Selection
Creators: name: Carvalho, Carlos
name: Kryvtsov, Oleksiy
Publisher: name: Bank of Canada
Year: 2018

description: We propose a simple, model-free way to measure selection in price setting and its contribution to inflation dynamics. The proposed measure of price selection is based on the observed comovement between inflation and the average level from which adjusting prices depart. When adjusting prices depart from lower-than-usual levels, the associated price adjustments are larger, pushing inflation above average. Using detailed micro-level consumer price data for the United Kingdom, the United States and Canada, we find robust evidence of strong price selection across goods and services. At a disaggregate level, price selection accounts for 37% of inflation variance in the United Kingdom, 36% in the United States, and 28% in Canada. Price selection is stronger for goods with less frequent price changes or with larger average price changes. Aggregate price selection is considerably weaker. This evidence can be accounted for by a relatively standard multisector sticky-price model. The model demonstrates a one-to-one mapping between our measure of price selection and the extent of monetary non-neutrality.
description: Dans cette étude, nous proposons un moyen simple, qui ne recourt à aucun modèle, de mesurer la sélection des prix et sa contribution à la dynamique de l’inflation. La mesure proposée est fondée sur les covariations observées entre l’inflation et le niveau moyen à partir duquel les prix s’ajustent. Lorsque les prix s’ajustent à partir de niveaux relativement bas, les variations de prix sont supérieures à la moyenne, ce qui pousse l’inflation au-dessus de la moyenne. L’analyse de données microéconomiques détaillées sur les prix à la consommation au Royaume-Uni, aux États-Unis et au Canada montre de façon concluante une forte sélection des prix pour les biens et les services. À un niveau désagrégé, la sélection des prix représente respectivement 37 %, 36 % et 28 % de la variance de l’inflation au Royaume-Uni, aux États-Unis, au Canada. La sélection des prix est plus forte dans le cas des biens ayant des variations de prix moins fréquentes ou en moyenne plus prononcées. À un niveau agrégé, la sélection des prix est beaucoup plus faible. Ces observations peuvent être expliquées par un modèle multisectoriel à prix rigides relativement standard. Ce modèle montre qu’il existe une correspondance biunivoque entre notre mesure de la sélection des prix et le degré de non-neutralité monétaire.
Constraining Sterile Neutrino Interpretations of the LSND and MiniBooNE Anomalies with Coherent Neutrino Scattering Experiments
Creators: name: Blanco, Carlos
name: Hooper, Dan
name: Machado, Pedro
Publisher: name: arXiv
Year: 2019
Subjects: subject: High Energy Physics - Phenomenology (hep-ph)
subject: FOS: Physical sciences

description: Results from the LSND and MiniBooNE experiments have been interpreted as evidence for a sterile neutrino with a mass near the electronvolt scale. Here we propose to test such a scenario by measuring the coherent elastic scattering rate of neutrinos from a pulsed spallation source. Coherent scattering is universal across all active neutrino flavors, and thus can provide a measurement of the total Standard Model neutrino flux. By performing measurements over different baselines and making use of timing information, it is possible to significantly reduce the systematic uncertainties and to independently measure the fluxes of neutrinos that originate as $ν_μ$ or as either $ν_e$ or $\barν_μ$. We find that a 100 kg CsI detector would be sensitive to the large fraction of the sterile neutrino parameter space that could potentially account for the LSND and MiniBooNE anomalies.
description: 5 oages, 3 figures
Duality in a stability problem for some functionals arising in interpolation theory
Creators: name: Tselishchev, Anton
Publisher: name: arXiv
Year: 2019
Subjects: subject: Functional Analysis (math.FA)
subject: FOS: Mathematics

description: By using duality, it is shown that there exist near-minimizers for the distance functionals for the couple $(L^\infty, L^p)$, $1
description: 6 pages
title: Market Size and Entry in International Trade: Product Versus Firm Fixed Costs
Creators: name: Steingress, Walter
Publisher: name: Bank of Canada
Year: 2018

description: This paper develops a theoretical framework to infer the nature of fixed costs from the relationship between entry patterns in international markets and destination market size. If fixed costs are at the firm level, firms take advantage of an intrafirm spillover by expanding firm-level product range (scope). Few firms enter with many products and dominate international trade. If fixed costs are at the product level, an interfirm spillover reduces the fixed costs to export for all firms producing the product. Using cross-country data on firm and product, I find empirical evidence consistent with product-level costs. More firms than products enter in larger markets, offering their consumers lower prices and a greater variety of goods within the product category.
description: Cette étude développe un cadre théorique afin de déduire la nature des coûts fixes de la relation entre l’entrée sur les marchés internationaux et la taille des marchés de destination. Si les coûts fixes se situent au niveau des entreprises, celles-ci peuvent tirer profit d’externalités intraentreprises pour élargir leur gamme de produits. Les marchés internationaux sont dominés par des entreprises qui y entrent en moins grand nombre, mais avec plus de produits. Si, par contre, les coûts fixes se situent au niveau du produit, il en résulte des externalités interentreprises qui font baisser les coûts fixes d’exportation de toutes les entreprises fabriquant un même produit. Obtenus à partir de données sur les entreprises et les produits de nombreux pays, mes résultats corroborent empiriquement l’hypothèse de la présence de coûts fixes au niveau du produit : les entreprises entrent en plus grand nombre que les produits sur les marchés de taille importante et offrent aux consommateurs de plus bas prix et une plus grande variété de produits de même catégorie.
Nematic transition and highly two-dimensional superconductivity in BaTi$_2$Bi$_2$O revealed by $^{209}$Bi-nuclear magnetic resonance/nuclear quadrupole resonance measurements
Creators: name: Kitagawa, Shunsaku
name: Ishida, Kenji
name: Ishii, Wataru
name: Yajima, Takeshi
name: Hiroi, Zenji
Publisher: name: arXiv
Year: 2018
Subjects: subject: Superconductivity (cond-mat.supr-con)
subject: Materials Science (cond-mat.mtrl-sci)
subject: Strongly Correlated Electrons (cond-mat.str-el)
subject: FOS: Physical sciences

description: In this Rapid Communication, a set of $^{209}$Bi-nuclear magnetic resonance (NMR)/nuclear quadrupole resonance (NQR) measurements has been performed to investigate the physical properties of superconducting (SC) BaTi$_2$Bi$_2$O from a microscopic point of view. The NMR and NQR spectra at 5~K can be reproduced with a non-zero in-plane anisotropic parameter $η$, indicating the breaking of the in-plane four-fold symmetry at the Bi site without any magnetic order, i.e., `the electronic nematic state'. In the SC state, the nuclear spin-lattice relaxation rate divided by temperature, $1/T_1T$, does not change even below $T_{\rm c}$, while a clear SC transition was observed with a diamagnetic signal. This observation can be attributed to the strong two-dimensionality in BaTi$_2$Bi$_2$O. Comparing the NMR/NQR results among BaTi$_2$$Pn$$_2$O ($Pn$ = As, Sb, and Bi), it was found that the normal and SC properties of BaTi$_2$Bi$_2$O were considerably different from those of BaTi$_2$Sb$_2$O and BaTi$_2$As$_2$O, which might explain the two-dome structure of $T_{\rm c}$ in this system.
description: 5 pages, 6 figures
How Do Non-Ideal UAV Antennas Affect Air-to-Ground Communications?
Creators: name: Khoshkholgh, M. G.
name: Navaie, Keivan
name: Yanikomeroglu, Halim
name: Leung, V. C. M.
name: Shin, Kang. G.
Publisher: name: arXiv
Year: 2019
Subjects: subject: Information Theory (cs.IT)
subject: FOS: Computer and information sciences

description: Analysis of the performance of Unmanned Aerial Vehicle (UAV)-enabled communications systems often relies upon idealized antenna characteristic, where the side-lobe gain of UAVs' antenna is ignored. In practice, however, side-lobe cause inevitable interference to the ground users. We investigate the impact of UAVs' antenna side-lobe on the performance of UAV-enabled communication. Our analysis shows that even for a very small antenna's side-lobe gain, the ground receiver can experience substantial interference. We further show that a rather large exclusion zone is required to ensure a sufficient level of protection for the ground receiver. Nevertheless, in a multiple-antenna setting for the ground users, even when such a large exclusion zone was in place, UAVs' antenna side-lobe creates a high level of correlation among the interference signals received across receive antennas. Such a correlation limits the system ability to exploit channel diversity in a multiple-antenna setting for improving capacity. We then quantify the impact of UAVs' antenna side-lobes on the overall system performance by deriving the corresponding loss of the achieved capacity in various communications environments. We provide a new quantitative insight on the cost of adopting non-ideal UAV antenna on the overall capacity. Our analysis also shows that the capacity loss can be confined by careful selection of system parameters.
description: 7 pages conference
Multicritical Microscopic Spectral Correlators of Hermitian and Complex Matrices
Creators: name: Akemann, G.
name: Damgaard, P. H.
name: Magnea, U.
name: Nishigaki, S. M.
Publisher: name: arXiv
Year: 1997
Subjects: subject: High Energy Physics - Theory (hep-th)
subject: Statistical Mechanics (cond-mat.stat-mech)
subject: High Energy Physics - Lattice (hep-lat)
subject: FOS: Physical sciences

description: We find the microscopic spectral densities and the spectral correlators associated with multicritical behavior for both hermitian and complex matrix ensembles, and show their universality. We conjecture that microscopic spectral densities of Dirac operators in certain theories without spontaneous chiral symmetry breaking may belong to these new universality classes.
description: 29 pages, 12 figures, LateX, subsect.3.1 improved, typos corrected
Structure Selection of Polynomial NARX Models using Two Dimensional (2D) Particle Swarms
Creators: name: Hafiz, Faizal
name: Swain, Akshya
name: Mendes, Eduardo MAM
name: Patel, Nitish
Publisher: name: arXiv
Year: 2018
Subjects: subject: Systems and Control (eess.SY)
subject: FOS: Electrical engineering, electronic engineering, information engineering

description: The present study applies a novel two-dimensional learning framework (2D-UPSO) based on particle swarms for structure selection of polynomial nonlinear auto-regressive with exogenous inputs (NARX) models. This learning approach explicitly incorporates the information about the cardinality (i.e., the number of terms) into the structure selection process. Initially, the effectiveness of the proposed approach was compared against the classical genetic algorithm (GA) based approach and it was demonstrated that the 2D-UPSO is superior. Further, since the performance of any meta-heuristic search algorithm is critically dependent on the choice of the fitness function, the efficacy of the proposed approach was investigated using two distinct information theoretic criteria such as Akaike and Bayesian information criterion. The robustness of this approach against various levels of measurement noise is also studied. Simulation results on various nonlinear systems demonstrate that the proposed algorithm could accurately determine the structure of the polynomial NARX model even under the influence of measurement noise.
title: Responding to the First Era of Globalization: Canadian Trade Policy, 1870–1913
Creators: name: Keay, Ian
name: Alexander, Patrick
Publisher: name: Bank of Canada
Year: 2018

description: In this paper we document Canada’s trade policy response to late-nineteenth- and earlytwentieth-century globalization. We link newly digitized annual product-specific data on the value of Canadian imports and duties paid from 1870–1913 to establishment-specific production and location information drawn from the manuscripts of the 1871 industrial census. Our findings reveal a highly selective move towards protectionism following the adoption of the National Policy in 1879. Changes in the Canadian tariff schedule narrowly targeted final consumption goods that had close substitutes produced by relatively large, politically influential domestic manufacturers.
description: Dans cette étude, nous analysons la réaction de la politique commerciale du Canada à la phase de mondialisation économique de la fin du XIXe et du début du XXe siècle. Nous mettons en rapport des données annuelles récemment numérisées sur la valeur d’importations canadiennes et les droits de douane acquittés de 1870 à 1913 pour des produits particuliers avec de l’information propre aux fabricants concernant leur production et leur lieu d’implantation, laquelle provient des manuscrits du recensement des établissements industriels de 1871. Nos résultats font apparaître une montée hautement sélective du protectionnisme après l’adoption de la Politique nationale, en 1879. Les modifications apportées au tarif douanier canadien ciblent spécifiquement les biens de consommation finale pour lesquels il existait de proches substituts fabriqués par des entreprises nationales de taille plutôt importante qui usaient d’influence politique.
Characterizing large-scale quantum computers via cycle benchmarking
Creators: name: Erhard, Alexander
name: Wallman, Joel James
name: Postler, Lukas
name: Meth, Michael
name: Stricker, Roman
name: Martinez, Esteban Adrian
name: Schindler, Philipp
name: Monz, Thomas
name: Emerson, Joseph
name: Blatt, Rainer
Publisher: name: arXiv
Year: 2019
Subjects: subject: Quantum Physics (quant-ph)
subject: FOS: Physical sciences

description: Quantum computers promise to solve certain problems more efficiently than their digital counterparts. A major challenge towards practically useful quantum computing is characterizing and reducing the various errors that accumulate during an algorithm running on large-scale processors. Current characterization techniques are unable to adequately account for the exponentially large set of potential errors, including cross-talk and other correlated noise sources. Here we develop cycle benchmarking, a rigorous and practically scalable protocol for characterizing local and global errors across multi-qubit quantum processors. We experimentally demonstrate its practicality by quantifying such errors in non-entangling and entangling operations on an ion-trap quantum computer with up to 10 qubits, with total process fidelities for multi-qubit entangling gates ranging from 99.6(1)% for 2 qubits to 86(2)% for 10 qubits. Furthermore, cycle benchmarking data validates that the error rate per single-qubit gate and per two-qubit coupling does not increase with increasing system size.
description: The main text consists of 6 pages, 3 figures and 1 table. The supplementary information consists of 6 pages, 2 figures and 3 tables
Observation of Magnetopiezoelectric Effect in Antiferromagnetic Metal EuMnBi2
Creators: name: Shiomi, Y.
name: Watanabe, H.
name: Masuda, H.
name: Takahashi, H.
name: Yanase, Y.
name: Ishiwata, S.
Publisher: name: arXiv
Year: 2018
Subjects: subject: Materials Science (cond-mat.mtrl-sci)
subject: Strongly Correlated Electrons (cond-mat.str-el)
subject: FOS: Physical sciences

description: We have experimentally studied a magnetopiezoelectric effect predicted recently for magnetic metals with low crystal symmetries. In EuMnBi2 with antiferromagnetic Mn moments at 77 K, dynamic displacements emerge along the $a$ direction upon application of ac electric fields in the $c$ direction, and increase in proportion to the applied electric fields. Such displacements are not observed along the $c$ direction of EuMnBi2 or EuZnBi2 with nonmagnetic Zn ions. As temperature increases from 77 K, the displacement signals decrease and disappear at about 200 K, above which electric conduction changes from coherent to incoherent. These results demonstrate the emergence of the magnetopiezoelectric effect in a magnetic metal lacking inversion and time-reversal symmetries.
Alexa grandiflora Ducke
Creators: name: Molino, Jean-François
name: Sabatier, Daniel
name: Grenand, Pierre
name: Engel, Julien
name: Frame, Dawn
name: Delprete, Piero G.
name: Fleury, Marie
name: Odonne, Guillaume
name: Davy, Damien
name: Lucas, Eve J.
name: Martin, Claire A.
Publisher: name: Zenodo
Year: 2022
Subjects: Biodiversity
Taxonomy
Plantae
Tracheophyta
Magnoliopsida
Fabales
Fabaceae
Alexa
Alexa grandiflora

description: [741] Alexa grandiflora Ducke
 Arch. Jard. Bot. Rio de Janeiro 1 (1): 33 (Ducke 1915).
 NOTE. — P. Grenand & M.-F. Prévost 2017, identified by R. S. Cowan in 1977 at CAY as A. grandiflora, actually belongs to Alexa wachenheimii.
VERNACULAR NAMES. — Wp: ani, takulawa’ɨ• Cr: sen-martin-blan • Br: melancieira.
 HERBARIUM DATA (FG). — A single collection, P. Grenand 774.
SIZE. — Up to 30 m tall (Ducke 1915: 33).
description: Published as part of Molino, Jean-François, Sabatier, Daniel, Grenand, Pierre, Engel, Julien, Frame, Dawn, Delprete, Piero G., Fleury, Marie, Odonne, Guillaume, Davy, Damien, Lucas, Eve J. & Martin, Claire A., 2022, An annotated checklist of the tree species of French Guiana, including vernacular nomenclature, pp. 345-903 in Adansonia (3) (3) 44 (26) on page 505, DOI: 10.5252/adansonia2022v44a26, http://zenodo.org/record/7458777
Molecular Dynamics for Fermions
Creators: name: Feldmeier, H.
name: Schnack, J.
Publisher: name: arXiv
Year: 2000
Subjects: subject: Statistical Mechanics (cond-mat.stat-mech)
subject: Nuclear Theory (nucl-th)
subject: Plasma Physics (physics.plasm-ph)
subject: FOS: Physical sciences

description: The time-dependent variational principle for many-body trial states is used to discuss the relation between the approaches of different molecular dynamics models to describe indistinguishable fermions. Early attempts to include effects of the Pauli principle by means of nonlocal potentials as well as more recent models which work with antisymmetrized many-body states are reviewed under these premises. Keywords: Many-body theory; Fermion system; Molecular dynamics; Wave-packet dynamics; Time-dependent variational principle; Statistical properties; Canonical ensemble; Ergodicity; Time averaging
description: 97 pages, 13 postscript figures. To be published in July 2000 issue of Reviews of Modern Physics. More information at http://www-aix.gsi.de/~fmd/