cometadata/datacite-rtg-text-other-reclassification-records huggingface dataset:
Ferromagnetic phase transition and Bose-Einstein condensation in spinor Bose gases
Creators: name: Gu, Qiang
name: Klemm, Richard A.
Publisher: name: arXiv
Year: 2003
Subjects: subject: Condensed Matter (cond-mat)
subject: FOS: Physical sciences

description: Phase transitions in spinor Bose gases with ferromagnetic (FM) couplings are studied via mean-field theory. We show that an infinitesimal value of the coupling can induce a FM phase transition at a finite temperature always above the critical temperature of Bose-Einstein condensation. This contrasts sharply with the case of Fermi gases, in which the Stoner coupling $I_s$ can not lead to a FM phase transition unless it is larger than a threshold value $I_0$. The FM coupling also increases the critical temperatures of both the ferromagnetic transition and the Bose-Einstein condensation.
description: 4 pages, 4 figures
The CHIME Pulsar Project: System Overview
Creators: name: Pulsar Collaboration
name: Amiri, M.
name: Bandura, K. M.
name: Boyle, P. J.
name: Brar, C.
name: Cliche, J. F.
name: Crowter, K.
name: Cubranic, D.
name: Demorest, P. B.
name: Denman, N. T.
name: Dobbs, M.
name: Dong, F. Q.
name: Fandino, M.
name: Fonseca, E.
name: Good, D. C.
name: Halpern, M.
name: Hill, A. S.
name: Höfer, C.
name: Kaspi, V. M.
name: Landecker, T. L.
name: Leung, C.
name: Lin, H. -H.
name: Luo, J.
name: Masui, K. W.
name: McKee, J. W.
name: Mena-Parra, J.
name: Meyers, B. W.
name: Michilli, D.
name: Naidu, A.
name: Newburgh, L.
name: Ng, C.
name: Patel, C.
name: Pinsonneault-Marotte, T.
name: Ransom, S. M.
name: Renard, A.
name: Scholz, P.
name: Shaw, J. R.
name: Sikora, A. E.
name: Stairs, I. H.
name: Tan, C. M.
name: Tendulkar, S. P.
name: Tretyakov, I.
name: Vanderlinde, K.
name: Wang, H.
name: Wang, X.
Publisher: name: arXiv
Year: 2020
Subjects: subject: Instrumentation and Methods for Astrophysics (astro-ph.IM)
subject: FOS: Physical sciences

description: We present the design, implementation and performance of a digital backend constructed for the Canadian Hydrogen Intensity Mapping Experiment (CHIME) that uses accelerated computing to observe radio pulsars and transient radio sources. When operating, the CHIME correlator outputs 10 independent streams of beamformed data for the CHIME/Pulsar backend that digitally track specified celestial positions. Each of these independent streams are processed by the CHIME/Pulsar backend system which can coherently dedisperse, in real-time, up to dispersion measure values of 2500 pc/cm$^{-3}$ . The tracking beams and real-time analysis system are autonomously controlled by a priority-based algorithm that schedules both known sources and positions of interest for observation with observing cadences as small as one day. Given the distribution of known pulsars and radio-transient sources, the CHIME/Pulsar system can monitor up to 900 positions once per sidereal day and observe all sources with declinations greater than $-20^\circ$ once every $\sim$2 weeks. We also discuss the science program enabled through the current modes of data acquisition for CHIME/Pulsar that centers on timing and searching experiments.
description: 18 pages, 9 figures, 1 table. Submitted to ApJS
title: The landed estate as patron of scientific innovation: Horticulture at Woburn Abbey, 1802-1839
Creators: name: Smith, Paul
Publisher: name: The Open University
Year: 1983

description: This thesis is concerned with the horticultural activities that took place in the early nineteenth century at Woburn Abbey, the stately home of John Russell, sixth Duke of Bedford (1766-1839). During the sixth Duke's reign the work undertaken at Woburn involved more than simply raising fruits and vegetables for the table and landscaping the grounds, creating different kinds of garden and cultivating trees, shrubs and flowers in order to provide pleasant vistas. Bedford was an important patron of scientific horticulture and the Abbey was a centre for innovative and experimental gardening. Under the Duke's direction investigations were carried out into various aspects of horticultural science. These enquiries contributed significantly to English scientific gardening during the first half of the nineteenth century. I shall detail the sixth Duke's patronage of science, discuss his motives and consider the scientific work he inaugurated at Woburn in relation to the wider institutional context of horticulture. Nearly all of the horticultural investigations at the Abbey were conducted by the head gardeners. The different tasks they carried out will be examined. It was their skill and effort which ensured that the Duke's ideas were put into operation. They helped to create and maintain Woburn Abbey's reputation for horticultural excellence, innovation and experiment. There will also be an evaluation of the Duke's schemes at the Abbey. Besides looking at their effect locally, their influence nationally will be appraised. The sixth Duke of Bedford's great predilection for gardening, the role played by his estate in the development of horticultural science at this time and his efforts to foster the growth of horticulture outside the confines of his stately home make Woburn a particularly useful point from which to explore some of the technical and social aspects of this scantily documented branch of nineteenth-century science.
Star-forming Galaxies in the 'Redshift Desert'
Creators: name: Steidel, C.
name: Shapley, A.
name: Pettini, M.
name: Adelberger, K.
name: Erb, D.
name: Reddy, N.
name: Hunt, M.
Publisher: name: arXiv
Year: 2004
Subjects: subject: Astrophysics (astro-ph)
subject: FOS: Physical sciences

description: We describe results of optical and near-IR observations of a large spectroscopic sample of star-forming galaxies photometrically-selected to lie in the redshift range 1.4 < z < 2.5, often called the ``redshift desert'' because of historical difficulty in obtaining spectroscopic redshifts in this range. We show that the former ``redshift desert'' is now very much open to observation.
description: 10 pages, 6 figures, to appear in the Proceedings of the ESO/USM/MPE Workshop on "Multiwavelength Mapping of Galaxy Formation and Evolution", eds. R. Bender and A. Renzini
EFFECT OF BUNCH SLEEVES IN REDUC1NG UNDERPEEL DISCOI.OURATION IN BANANAS EXPOSED TO LOW TEMPERATURES
Creators: name: Muirhead, Ian M.
name: Muirhead, Ian M.
Publisher: name: Unknown
Year: 1981
Subjects: Crop Production/Industries

description: Polyethylene sleeves (0.5 mil and 0.75 mil) significantly reduced the ocurrence of underpeel discolouration (Ü.P.D.) in Lacatan bananas. Distal hands were more susceptible to U.P.D. than others. Polyethylene sleeves (0.5 mil open and 0.75 mil closed) decreased bunch uniformity. Sleeving had no significant effect on shelf life (peel breaking force and pulp brittleness) of ripe fruit. The use of Polyethylene sleeves is therefore recommended for reducing the incidence of U.P.D.
Local determination of the constitutive law of a dense suspension of non-colloidal particles through MRI
Creators: name: Ovarlez, Guillaume
name: Bertrand, François
name: Rodts, Stéphane
Publisher: name: arXiv
Year: 2005
Subjects: subject: Soft Condensed Matter (cond-mat.soft)
subject: FOS: Physical sciences

description: We investigate the flowing behavior of dense suspensions of non-colloidal particles, by coupling macroscopic rheometric experiments and local velocity and concentration measurements through MRI techniques. We find that the flow is localized at low velocities, and that the material is inhomogeneous; the local laws inferred from macroscopic rheometric observations must then be reinterpreted in the light of these local observations. We show that the short time response to a velocity step allows to characterize dense suspensions locally: they have a purely viscous behavior, without any observable influence of friction. In the jammed zone, there may be a contact network, whereas in the sheared zone there are only hydrodynamic interactions: localization consists in a change in configuration at the grain scale. From the concentration and velocity profiles, we have provided for the first time local measurements of the concentration dependence of viscosity; we find a Krieger-Dougherty law $η(ϕ)=η_0(1-ϕ/0.605)^{-2}$. Shear induced migration is almost instantaneous and seems inconsistent with most observations: it would imply that the diffusion coefficients strongly depend on the concentration. We finally propose a simple constitutive law for dense suspensions, based on a purely viscous behavior, that accounts for all the macroscopic and local observations.
description: Submitted to the Journal of Rheology
The substellar population of the young cluster lambda Orionis
Creators: name: Navascues, David Barrado y
name: Stauffer, J. R.
name: Bouvier, J.
name: Jayawardhana, R.
name: Cuillandre, Jean-Charles
Publisher: name: arXiv
Year: 2004
Subjects: subject: Astrophysics (astro-ph)
subject: FOS: Physical sciences

description: By collecting optical and infrared photometry and low resolution spectroscopy, we have identified a large number of low mass stars and brown dwarf candidates belonging to the young cluster (~5 Myr) associated with the binary star lambda Orionis. The lowest mass object found is a M8.5 with an estimated mass of 0.02 Msun (~0.01 Msun for objects without spectroscopic confirmation). For those objects with spectroscopy, the measured strength of the Halpha emission line follows a distribution similar to other clusters with the same age range, with larger equivalent widths for cooler spectral types. Three of the brown dwarfs have Halpha emission equivalent widths of order 100 Å, suggestive that they may have accretion disks and thus are the substellar equivalent of Classical T Tauri stars. We have derived the Initial Mass Function for the cluster. For the substellar regime, the index of the mass spectrum is alpha=0.60$+-0.06, very similar to other young associations.
description: Astrophysica Journal, accepted April 2, 2004
Supplementary Figures from The influence of environmental setting on the community ecology of Ediacaran organisms
Creators: name: Mitchell, Emily G.
name: Bobkov, Nikolai
name: Bykova, Natalia
name: Alavya Dhungana
name: Kolesnikov, Anton V.
name: Hogarth, Ian R. P.
name: Liu, Alexander G.
name: Mustill, Tom M. R.
name: Sozonov, Nikita
name: Rogov, Vladimir I.
name: Shuhai Xiao
name: Grazhdankin, Dmitriy V.
Publisher: name: The Royal Society
Year: 2020
Subjects: subject: 60114 Systems Biology
subject: FOS: Biological sciences
subject: 60199 Biochemistry and Cell Biology not elsewhere classified
subject: 69999 Biological Sciences not elsewhere classified

description: Fig. S1: Locality map. Fig S2: Stratigraphic logs through the Russian sections. Fig S3: High resolution digitized map of KS surface. Fig S4: : Analyses of the size-distribution of Funisia populations
WELFARE IMPLICATIONS OF TIMBERLAND OWNERSHIP CHANGES IN THE U.S. TIMBER MARKETS
Creators: name: Rahman, Mohammad Mahfuzur
name: Munn, Ian Alexander
name: Sun, Changyou
name: Rahman, Mohammad Mahfuzur
name: Munn, Ian Alexander
name: Sun, Changyou
Publisher: name: Unknown
Year: 2016
Subjects: subject: Agribusiness
subject: Agricultural and Food Policy
subject: Community/Rural/Urban Development
subject: Crop Production/Industries
subject: Labor and Human Capital
subject: Marketing
subject: FOS: Economics and business
subject: Political Economy
subject: Market equilibrium
subject: Price
subject: Surplus
subject: Tax
subject: Welfare

description: n the last two decades, many forest product firms in the U.S. either divested their timberlands to timber investment management organizations (TIMOs) and conservation organizations or converted their corporate structures from C corporations to real estate investment trusts (REITs). All landowners sold smaller timberland tracts for nonforestry uses. Reduced timber supplies from conservation organizations and timberland loss to other nonforestry uses have consequences on producer and consumer surpluses in the U.S. timber markets. Equilibrium displacement model has been employed to evaluate the welfare changes in U.S. timber markets attributed to timberland ownership changes. Net reduction of timber supply contributed to the reduction of social surplus by $43 million in 2006. Compared to the $33 billion plus U.S. timber markets, this welfare reduction was small. Overall, this article explains the shifts of economic surpluses among producers and net surplus reduction for the society attributed to timberland ownership changes in the United States.
New counterexamples to Strichartz estimates for the wave equation on a 2d model convex domain
Creators: name: Ivanovici, Oana
name: Lebeau, Gilles
name: Planchon, Fabrice
Publisher: name: arXiv
Year: 2020
Subjects: subject: Analysis of PDEs (math.AP)
subject: FOS: Mathematics
subject: 35R01, 35A17, 35B45, 35L10, 35L20

description: We prove that the range of Strichartz estimates on a model 2D convex domain may be further restricted compared to the known counterexamples due to the first author. Our new family of counterexamples is now built on the parametrix construction from our earlier work. Interestingly enough, it is sharp in at least some regions of phase space.
description: 23 pages, 1 figure
Supplementary Information from Predicting collapse of complex ecological systems: quantifying the stability–complexity continuum
Creators: name: Pettersson, Susanne
name: Savage, Van M.
name: Jacobi, Martin Nilsson
Publisher: name: The Royal Society
Year: 2020
Subjects: subject: 60114 Systems Biology
subject: FOS: Biological sciences
subject: 60199 Biochemistry and Cell Biology not elsewhere classified
subject: 69999 Biological Sciences not elsewhere classified
subject: Computational Biology
subject: 10202 Biological Mathematics
subject: FOS: Mathematics

description: Dynamical shifts between the extremes of stability and collapse are hallmarks of ecological systems. These shifts are limited by and change with biodiversity, complexity, and the topology and hierarchy of interactions. Most ecological research has focused on identifying conditions for a system to shift from stability to any degree of instability—species abundances do not return to exact same values after perturbation. Real ecosystems likely have a continuum of shifting between stability and collapse that depends on the specifics of how the interactions are structured, as well as the type and degree of disturbance due to environmental change. Here we map boundaries for the extremes of strict stability and collapse. In between these boundaries, we find an intermediate regime that consists of single-species extinctions, which we call the extinction continuum. We also develop a metric that locates the position of the system within the extinction continuum—thus quantifying proximity to stability or collapse—in terms of ecologically measurable quantities such as growth rates and interaction strengths. Furthermore, we provide analytical and numerical techniques for estimating our new metric. We show that our metric does an excellent job of capturing the system's behaviour in comparison with other existing methods—such as May’s stability criteria or critical slowdown. Our metric should thus enable deeper insights about how to classify real systems in terms of their overall dynamics and their limits of stability and collapse.
A mathematical model for pancreatic cancer during intraepithelial neoplasia
Creators: name: Romero-Arias, José Roberto
name: Briones-Andrade, Joshua
name: Ramirez-Santiago, Guillermo
Publisher: name: Zenodo
Year: 2024
Subjects: Network regulation
negative and positive feedback
delay differential equations

description: Cancer is the result of complex interactions of intrinsic and extrinsic cell processes, which promote sustained proliferation, resistance to apoptosis, reprogramming, and reorganization. The evolution of any type of cancer emerges from the role of the microenvironmental conditions and the impact of some molecular complexes on certain signalling pathways. The understanding of the early onset of cancer requires a multiscale analysis of the cellular microenvironment. In this paper, we analyse a quantitative multiscale model of pancreatic adenocarcinoma by modelling the cellular microenvironment through elastic cell interactions and their intercellular communication mechanisms, such as growth factors and cytokines. We focus on the low-grade dysplasia (PanIN 1) and moderate dysplasia (PanIN 2) stages of pancreatic adenocarcinoma. To this end, we propose a gene regulatory network associated with the processes of proliferation and apoptosis of pancreatic cells and its kinetics in terms of delayed differential equations to mimic cell development. Likewise, we couple the cell cycle with the spatial distribution of cells and the transport of growth factors to show that the adenocarcinoma evolution is triggered by inflammatory processes. We show that the oncogene RAS may be an important target for developing anti-inflammatory strategies that limit the emergence of more aggressive adenocarcinomas.
description: Funding provided by: Universidad Nacional Autónoma de MéxicoROR ID: https://ror.org/01tmp8f25Award Number: IN-109722
Funding provided by: Universidad Nacional Autónoma de MéxicoROR ID: https://ror.org/01tmp8f25Award Number: IN-108916
description: We considered a genetic regulatory network in the development of pancreatic cancer and modified it to observe only the cellular phenotypes that give rise to proliferation and apoptosis in healthy and cancerous cells. We proposed a dynamic model with differential equations with delay to show that the accumulation of mutations generates regressions in the genetic network of healthy cells causing the transition to cells with cancer. The delay in the actions of the Ras gene is considered the main trigger of neoplasia and inflammation in tissues. We built a spatial model, with polynomial cells, to show the correlation between inflammation, the regulatory network and the proliferation and apoptosis rates of cells in the tissue.
Lift of degeneracy of Landau levels of 2D electron gas by point-like impurities
Creators: name: Dyugaev, A. M.
name: Grigoriev, P. D.
name: Ovchinnikov, Yu. N.
Publisher: name: arXiv
Year: 2003
Subjects: subject: Mesoscale and Nanoscale Physics (cond-mat.mes-hall)
subject: Statistical Mechanics (cond-mat.stat-mech)
subject: FOS: Physical sciences

description: We study the density of states of two-dimensional electron gas in magnetic field with scattering on point-like impurities that are uniformly distributed along the sample. We show that the electron-impurity interaction completely lifts the degeneracy of the Landau levels even at low impurity concentration. This statement is in contradiction with the previous results obtained in the unphysical approximation of two-dimensional impurities. There is a large region of the electron energy $ω$, counted from the Landau level, where the density of states $ρ(ω)$ is inversely proportional to $|ω|$ and proportional to the impurity concentration. Our results are applicable to different 2D electron systems as heterostructures, inversion layers and interfaces.
description: 8 pages, 1 figure
Commuting Jacobi operators on Real hypersurfaces of Type B in the complex quadric
Creators: name: Lee, Hyunjin
name: Suh, Young Jin
Publisher: name: arXiv
Year: 2020
Subjects: subject: Differential Geometry (math.DG)
subject: FOS: Mathematics
subject: 53C40, 53C55

description: In this paper, first, we investigate the commuting property between the normal Jacobi operator~${\bar R}_N$ and the structure Jacobi operator~$R_ξ$ for Hopf real hypersurfaces in the complex quadric~$Q^m = SO_{m+2}/SO_mSO_2$, $m \geq 3$, which is defined by ${\bar R}_N R_ξ = R_ξ{\bar R}_N$. Moreover, a new characterization of Hopf real hypersurfaces with $\mathfrak A$-principal singular normal vector field in the complex quadric~$Q^{m}$ is obtained. By virtue of this result, we can give a remarkable classification of Hopf real hypersurfaces in the complex quadric~$Q^{m}$ with commuting Jacobi operators.
description: 20 pages. arXiv admin note: text overlap with arXiv:1907.04661, arXiv:1605.05316
How to define quantum mean-field solvable Hamiltonians using Lie algebras
Creators: name: Izmaylov, Artur F.
name: Yen, Tzu-Ching
Publisher: name: arXiv
Year: 2020
Subjects: subject: Quantum Physics (quant-ph)
subject: Chemical Physics (physics.chem-ph)
subject: FOS: Physical sciences

description: Necessary and sufficient conditions for quantum Hamiltonians to be exactly solvable within mean-field theories have not been formulated so far. To resolve this problem, first, we define what mean-field theory is, independently of a Hamiltonian realization in a particular set of operators. Second, using a Lie-algebraic framework we formulate a criterion for a Hamiltonian to be mean-field solvable. The criterion is applicable for both distinguishable and indistinguishable particle cases. For the electronic Hamiltonians, our approach reveals the existence of mean-field solvable Hamiltonians of higher fermionic operator powers than quadratic. Some of the mean-field solvable Hamiltonians require different sets of quasi-particle rotations for different eigenstates, which reflects a more complicated structure of such Hamiltonians.
Supplemental analyses and results from Behavioural syndromes shape evolutionary trajectories via conserved genetic architecture
Creators: name: Royauté, Raphael
name: Hedrick, Ann
name: Dochtermann, Ned A.
Publisher: name: The Royal Society
Year: 2020
Subjects: subject: Genetics
subject: FOS: Biological sciences
subject: Evolutionary Biology
subject: 60801 Animal Behaviour

description: Behaviours are often correlated within broader syndromes, creating the potential for evolution in one behaviour to drive evolutionary changes in other behaviours. Despite demonstrations that behavioural syndromes are common, this potential for evolutionary effects has not been demonstrated. Here we show that populations of field crickets (Gryllus integer) exhibit a genetically conserved behavioural syndrome structure, despite differences in average behaviours. We found that the distribution of genetic variation and genetic covariance among behavioural traits was consistent with genes and cellular mechanisms underpinning behavioural syndromes rather than correlated selection. Moreover, divergence among populations' average behaviours was constrained by the genetically conserved behavioural syndrome. Our results demonstrate that a conserved genetic architecture linking behaviours has shaped the evolutionary trajectories of populations in disparate environments—illustrating an important way for behavioural syndromes to result in shared evolutionary fates.
Transient behaviour towards the stable limit cycle in the Selkov model of Glycolysis: A physiological disorder
Creators: name: Das, Tanmay
name: Acharyya, Muktish
Publisher: name: arXiv
Year: 2020
Subjects: subject: Quantitative Methods (q-bio.QM)
subject: Soft Condensed Matter (cond-mat.soft)
subject: Adaptation and Self-Organizing Systems (nlin.AO)
subject: Biological Physics (physics.bio-ph)
subject: FOS: Biological sciences
subject: FOS: Physical sciences

description: A simplified model for the complex glycolytic process was historically proposed by Selkov. It showed the existence of stable limit cycle as an example of Poincare-Bendixson theorem. This limit cycle is nothing but the time eliminated Lissajous plot of the concentrations of Adenosine-diphosphate (ADP) and Fructose-6-phosphate (F6P) of a normal/healthy human. Deviation from this limit cycle is equivalent to the deviation of normal physiological behaviour. It is very important to know how long a human body will take to reach the glycolytic stable limit cycle, if deviated from it. However, till now the convergence time, depending upon different initial parameter values, was not studied in detail. This may have great importance in understanding the recovery time for a diseased individual deviated from normal cycle. Here the convergence time for different initial conditions has been calculated in original Selkov model. It is observed that convergence time, as a function of the distance from the limit cycle, gets saturated away from the cycle. This result seems to be a physiological disorder. A possible mathematical way to incorporate this in the Selkov model, has been proposed.
description: 8 oages Latex and 5 eps figures
Graduate recitals
Creators: name: Zhang, Haishi
Publisher: name: University of British Columbia
Year: 2011

description: The thesis for the Master of Music degree in Orchestral Instruments consists of two full-length recitals, or the equivalent, with emphasis on solo works, but also including representative chamber works. My two full-length recitals were performed on March 25, 2006 and April 1, 2007.
A Post-Separation Social Accounting Matrix for the Sudan
Creators: name: Siddig, Khalid
name: Elagra, Samir
name: Grethe, Harald
name: Mubarak, Amel
name: Siddig, Khalid
name: Elagra, Samir
name: Grethe, Harald
name: Mubarak, Amel
Publisher: name: Unknown
Year: 2016
Subjects: subject: Demand and Price Analysis
subject: International Development
subject: International Relations/Trade
subject: Labor and Human Capital
subject: Production Economics
subject: Sudan
subject: Social Accounting Matrix
subject: agriculture
subject: water
subject: energy

description: The 2012 SAM for the Sudan, with a special focus on agriculture, water and energy, is built using data from domestic sources in the Sudan including the Central Bureau of Statistics, the Ministry of Agriculture, the Ministry of Finance and Economic Planning and the Central Bank of Sudan besides other external sources. Major data sets used include the 2012 National Accounts and Trade Statistics of the CBS, the 53rd Annual Report of the Central Bank of the Sudan, the 2011 Labor Force Survey, the 2009 Household Income and Expenditure Survey, The 2009-2012 Agricultural Production Cost Survey and the 2005 Industrial Survey. Data from external sources are used to complement national sources. These sources include IMF studies on government finances, FAO reports and data on agriculture and ILO reports on labor. The SAM distinguishes between agricultural activities based on the modes of irrigation, energy based on its major sources and water based on modes of production and types of uses. Land is divided into irrigated and non-irrigated, while natural water resources are added in a separate account. Households are categorized by state, location (rural and urban) and income quintiles. Labor accounts are differentiated based on location (rural and urban), skill level and gender.
UNISECO Project Introduction Final Conference, 18 th March 2021
Creators: name: Schwarz, Gerald
Publisher: name: Zenodo
Year: 2021
Subjects: UNISECO H2020 PROJECT
agroecological farming systems
European Union

description: Presentation at the UNISECO H2020 Final Conference, 18-19 March 2021
 https://uniseco-project.eu/final-conference UNISECO is a European research project aiming to develop innovative approaches to enhance the understanding of socio-economic and policy drivers and barriers for further development and implementation of agro-ecological practices in EU farming systems. Learn more about the project: https://uniseco-project.eu/ This project has received funding from the European Union's H2020 research and innovation programme under grant agreement No 773901
Bifurcations and strange attractors
Creators: name: Shilnikov, Leonid
Publisher: name: arXiv
Year: 2003
Subjects: subject: Dynamical Systems (math.DS)
subject: FOS: Mathematics
subject: 37C29, 37C70, 37C15, 37D45

description: We review the theory of strange attractors and their bifurcations. All known strange attractors may be subdivided into the following three groups: hyperbolic, pseudo-hyperbolic ones and quasi-attractors. For the first ones the description of bifurcations that lead to the appearance of Smale-Williams solenoids and Anosov-type attractors is given. The definition and the description of the attractors of the second class are introduced in the general case. It is pointed out that the main feature of the attractors of this class is that they contain no stable orbits. An etanol example of such pseudo-hyperbolic attractors is the Lorenz one. We give the conditions of their existence. In addition we present a new type of the spiral attractor that requires countably many topological invariants for the complete description of its structure. The common property of quasi-attractors and pseudo-hyperbolic ones is that both admit homoclinic tangencies of the trajectories. The difference between them is due to quasi-attractors may also contain a countable subset of stable periodic orbits. The quasi-attractors are the most frequently observed limit sets in the problems of nonlinear dynamics. However, one has to be aware that the complete qualitative analysis of dynamical models with homoclinic tangencies cannot be accomplished.
On the fixed volume discrepancy of the Korobov point sets
Creators: name: Rubtsova, A. S.
name: Ryutin, K. S.
name: Temlyakov, V. N.
Publisher: name: arXiv
Year: 2020
Subjects: subject: Numerical Analysis (math.NA)
subject: FOS: Mathematics

description: This paper is devoted to the study of a discrepancy-type characteristic -- the fixed volume discrepancy -- of the Korobov point sets in the unit cube. It was observed recently that this new characteristic allows us to obtain optimal rate of dispersion from numerical integration results. This observation motivates us to thoroughly study this new version of discrepancy, which seems to be interesting by itself. This paper extends recent results by V. Temlyakov and M. Ullrich on the fixed volume discrepancy of the Fibonacci point sets.
description: 16 pages. arXiv admin note: substantial text overlap with arXiv:1908.04658
Produktywność czynnika ziemia a jego zasób
Creators: name: Bezat-Jarzębowska, Agnieszka
name: Rembisz, Włodzimierz
name: Bezat-Jarzębowska, Agnieszka
name: Rembisz, Włodzimierz
Publisher: name: Unknown
Year: 2016
Subjects: subject: Agribusiness
subject: Community/Rural/Urban Development
subject: International Development
subject: Land Economics/Use
subject: Productivity Analysis
subject: productivity
subject: production factors
subject: land factor
subject: land resources
subject: / produktywność
subject: czynniki produkcji
subject: czynnik ziemia
subject: zasoby ziemi

description: Within the framework of the paper the substitution between productivity of land and its resources was evaluated. Previous studies were conducted at the farm level, while in the paper, the problem was assessed in a sector scale, ie. with respect to the aggregate agricultural data of the EU countries. The agricultural data set of selected EU countries available in EUROSTAT was a subject of empirical illustration. The observations on the plots created the classic substitution curve, ie. in accordance with theoretical assumptions and research hypothesis. / Synopsis. W artykule poddano ocenie zależność substytucyjną między produktywnością czynnika ziemia i zasobem tego czynnika. Dotychczasowe badania prowadzone były na poziomie gospodarstwa rolnego, w artykule natomiast ujęto ten problem w skali sektorowej, tj. w odniesieniu do danych zagregowanych dla rolnictwa krajów UE. Przedmiotem ilustracji empirycznej były dane dla rolnictwa wybranych państw UE dostępne w EUROSTAT. Funkcja stanowiąca obwiednię danych empirycznych przyjmowała kształt klasycznej krzywej substytucji, tj. zgodnie z założeniami teoretycznymi i hipotezą badawczą.
Large-Scale Radio Structure in the Universe: Giant Radio Galaxies
Creators: name: Jamrozy, M.
name: Klein, U.
name: Machalski, J.
name: Mack, K. -H.
Publisher: name: arXiv
Year: 2004
Subjects: subject: Astrophysics (astro-ph)
subject: FOS: Physical sciences

description: Giant radio galaxies (GRGs), with linear sizes larger than 1 Mpc (H0=50 km/s/Mpc), represent the biggest single objects in the Universe. GRGs are rare among the entire population of radio galaxies (RGs) and their physical evolution is not well understood though for many years they have been of special interest for several reasons. The lobes of radio sources can compress cold gas clumps and trigger star or even dwarf galaxy formation, they can also transport gas from a host galaxy to large distances and seed the IGM with magnetic fields. Since GRGs have about 10 to 100 times larger sizes than normal RGs, their influence on the ambient medium is correspondingly wider and is pronounced on scales comparable to those of clusters of galaxies or larger. Therefore `giants' could play an important role in the process of large-scale structure formation in the Universe. Recently, thanks to the new all sky radio surveys, significant progress in searching for new GRGs has been made.
description: To appear in Multiwavelength AGN Surveys, ed. R. Maiolino and R. Mujica, Singapore: World Scientific, 2004, 2 pages
The stochastic telegraph equation limit of the stochastic higher spin six vertex model
Creators: name: Lin, Yier
Publisher: name: arXiv
Year: 2020
Subjects: subject: Probability (math.PR)
subject: Mathematical Physics (math-ph)
subject: FOS: Mathematics
subject: FOS: Physical sciences
subject: 60H15, 82B20

description: In this paper, we prove that the stochastic telegraph equation arises as a scaling limit of the stochastic higher spin six vertex (SHS6V) model with general spin $I/2, J/2$. This extends results of Borodin and Gorin which focused on the $I=J=1$ six vertex case and demonstrates the universality of the stochastic telegraph equation in this context. We also provide a functional extension of the central limit theorem obtained in [Borodin and Gorin 2019, Theorem 6.1]. The main idea is to generalize the four point relation established in [Borodin and Gorin 2019, Theorem 3.1], using fusion.
description: 24 pages, 6 figures
Doctoral Thesis: "Role of exercise, cold, and the biological clock on energy balance in humans: The ACTIBATE study"
Creators: name: Manzano, Francisco Miguel Acosta
Publisher: name: figshare
Year: 2020
Subjects: subject: 110306 Endocrinology
subject: FOS: Clinical medicine
subject: 110602 Exercise Physiology
subject: FOS: Health sciences
subject: 111712 Health Promotion
subject: 110699 Human Movement and Sports Science not elsewhere classified
subject: 110799 Immunology not elsewhere classified
subject: 110107 Metabolic Medicine
subject: 110313 Nuclear Medicine

description: Here you can download the International Doctoral Thesis of Francisco M. Acosta, which was performed within the PROFITH research group, in Granada (Spain).
This thesis is focused on the role of exercise, cold, and the biological clock on energy balance in humans: The ACTIBATE study
Lepton Family Symmetry and Neutrino Mass Matrix
Creators: name: Ma, Ernest
Publisher: name: arXiv
Year: 2004
Subjects: subject: High Energy Physics - Phenomenology (hep-ph)
subject: FOS: Physical sciences

description: The standard model of leptons is extended to accommodate a discrete Z_3 X Z_2 family symmetry. After rotating the charged-lepton mass matrix to its diagonal form, the neutrino mass matrix reveals itself as very suitable for explaining atmospheric and solar neutrino oscillation data. A generic requirement of this approach is the appearance of three Higgs doublets at the electroweak scale, with observable flavor violating decays.
description: 9 pages, including 1 figure
Ewolucja światowego rynku tytoniu i wyrobów tytoniowych
Creators: name: Bodył, Magdalena Renata
name: Bodył, Magdalena Renata
Publisher: name: Unknown
Year: 2016
Subjects: subject: Agribusiness
subject: Crop Production/Industries
subject: International Relations/Trade
subject: tobacco
subject: tobacco products
subject: nicotine
subject: cigarettes
subject: / tytoń
subject: wyroby tytoniowe
subject: nikotyna
subject: papierosy

description: Tobacco is grown in at least 124 countries around the world. In 2013 cultivated 7.4 million tons of tobacco in the area of 4.3 million hectares. China is a leader in the production of tobacco. Over the last few decades tobacco production has shifted from high-income countries to countries with medium and low incomes. There has been a high increase in production in Asia and Africa and a decline in Europe and North America. The share of the export in the global production of tobacco in 2013 amounted to the 35.5%, what is indicating to pro-export character of the production in some regions of the world. The main suppliers are the South American countries and the main importers are countries of Europe. / Synopsis. Tytoń jest uprawiany w co najmniej 124 krajach na świecie. W 2013 r. uprawiano 7,4 mln ton tytoniu na powierzchni 4,3 mln ha. Liderem w produkcji tytoniu są Chiny. W ostatnich dekadach uprawa tytoniu przesunęła się z krajów o wysokich dochodach do krajów o średnich i niskich dochodach. Odnotowano wysoki wzrost produkcji w Azji i Afryce oraz spadek w Europie i Ameryce Północnej. Światowe obroty handlowe tytoniem systematycznie rosną. Udział eksportu w globalnej produkcji tytoniu w 2013 r. wynosił 35,5%, co wskazuje na proeksportowy charakter produkcji w niektórych regionach świata. Głównym dostawcami są kraje Ameryki Południowej a importerami kraje Europy.
Da People a OpenAIRE: ISPC verso l'Open Science
Creators: name: Fiorino, Salvatore
name: Paraciani, Nicolò
name: Rossi, Irene
Publisher: name: Zenodo
Year: 2021
Subjects: Open Access
Open Science
Zenodo
Repository
CNR People

description: Presentazione relativa all'intervento tenuto al webinar "Le scienze del patrimonio culturale on Air. ISPC e la politica Open Access" (15-03-2021). Elemento chiave per la reperibilità e l'accessibilità dei prodotti della ricerca è l'elaborazione dei metadati descrittivi delle risorse, ai fini della loro esposizione in repositories che garantiscano l'interoperabilità e il riuso dei dati. Attraverso il caso di studio di People e di CNR ExploRA, l'intervento mostrerà l'importanza di una corretta descrizione dei prodotti della ricerca negli archivi istituzionali. Verrà inoltre illustrato il processo di valutazione delle piattaforme che, attraverso il riuso automatizzato dei dati di People, consentiranno a ISPC di aderire pienamente all'Open Science, in conformità alle più recenti indicazioni europee.
title:  Problemi, strumenti e metodologie nell’analisi dei processi di riconoscimento dei caratteri in cinese L2
Creators: name: Zeng  ,  Yun
Publisher: name: Roma TrE-Press
Year: 2021

description: Come dimostrato da un numero crescente di studi, la decodifica di un testo cinese da parte di apprendenti L2 implica un’elaborazione a livello sublessicale. La questione di maggiore rilevanza è chiarire il rispettivo ruolo dei percorsi di attivazione ortografica, semantica e fonologica, tema che viene tipicamente investigato attraverso indagini sperimentali basate sulle tecniche di priming. Nell’intento di esaminare i principali protocolli sperimentali, mettere in luce alcune limitazioni, e individuare le aree che necessitano ulteriore approfondimento, questo articolo offre una panoramica delle maggiori ricerche, con particolare attenzione ai metodi di misurazione e ai tipi di task utilizzati.
description: La lingua cinese in Italia. Studi su didattica e acquisizione
Test of Pseudospin Symmetry in Deformed Nuclei
Creators: name: Ginocchio, J. N.
name: Leviatan, A.
name: Meng, J.
name: Zhou, Shan-Gui
Publisher: name: arXiv
Year: 2003
Subjects: subject: Nuclear Theory (nucl-th)
subject: FOS: Physical sciences

description: Pseudospin symmetry is a relativistic symmetry of the Dirac Hamiltonian with scalar and vector mean fields equal and opposite in sign. This symmetry imposes constraints on the Dirac eigenfunctions. We examine extensively the Dirac eigenfunctions of realistic relativistic mean field calculations of deformed nuclei to determine if these eigenfunctions satisfy these pseudospin symmetry constraints.
description: 14 pages, 9 EPS figure, submitted to Phys. Rev. C; v3: 3-D figures changed to 2-D ones
title:  Lo sviluppo della sensibilità sublessicale negli apprendenti italiani di cinese lingua straniera
Creators: name: Fontanarosa, Lucrezia
name: Casentini , Marco
name: Eletti  , Valentino
Publisher: name: Roma TrE-Press
Year: 2021

description: Il cinese è una lingua morfo-sillabica il cui sistema ortografico presenta tre livelli: il tratto, il radicale e il carattere. Ogni carattere occupa uno spazio tipografico e corrisponde ad un morfema e la parola è, di solito, composta da due caratteri. Questo articolo mostra come si sviluppa la sensibilità linguistica verso gli elementi sublessicali negli apprendenti italofoni che studiano cinese nella scuola secondaria. Nello specifico si fornirà un quadro dello sviluppo della sensibilità strutturale, submorfemica, e morfemica che sembrano tutte e tre incrementali rispetto all’anno di studio della lingua e in parziale correlazione tra loro.
description: Il cinese è una lingua morfo-sillabica il cui sistema ortografico presenta tre livelli: il tratto, il radicale e il carattere. Ogni carattere occupa uno spazio tipografico e corrisponde ad un morfema e la parola è, di solito, composta da due caratteri. Questo articolo mostra come si sviluppa la sensibilità linguistica verso gli elementi sublessicali negli apprendenti italofoni che studiano cinese nella scuola secondaria. Nello specifico si fornirà un quadro dello sviluppo della sensibilità strutturale, submorfemica, e morfemica che sembrano tutte e tre incrementali rispetto all’anno di studio della lingua e in parziale correlazione tra loro.
An XMM-Newton X-ray View of Supernova Remnant W49B: Revisiting its Recombining Plasmas and Progenitor Type
Creators: name: Sun, Lei
name: Chen, Yang
Publisher: name: arXiv
Year: 2020
Subjects: subject: High Energy Astrophysical Phenomena (astro-ph.HE)
subject: FOS: Physical sciences

description: We present a comprehensive X-ray spectroscopy and imaging study of supernova remnant W49B using archival XMM-Newton observations. The overionization state of the shocked ejecta in W49B is clearly indicated by the radiative recombination continua of Si XIV, S XV, and Fe XXV, combined with the Ly$α$ lines of Ca and Fe. The line flux images of W49B indicate high emission measures of the central bar-like region for almost all the emission lines, while the equivalent width maps reveal a stratified structure for the metal abundance distributions. The global spectrum of W49B is well reproduced by a model containing one collisional ionization equilibrium (CIE) plasma component and two recombining plasma (RP) components. The CIE plasma represents the shocked interstellar medium, which dominates the X-ray emitting volume in W49B with a mass $\sim450M_\odot$. The two RP components with a total mass $\sim4.6M_\odot$ are both dominated by the ejecta material, but characterized by different electron temperatures ($\sim1.60$ keV and $\sim0.64$ keV). The recombination ages of the RP components are estimated as $\sim6000$ yr and $\sim3400$ yr, respectively. We then reveal the possibility of a thermal conduction origin for the high-temperature RP in W49B by calculating the conduction timescale. The metal abundance ratios of the ejecta in W49B are roughly consistent with a core-collapse explosion model with a $\lesssim15M_\odot$ progenitor, except for a rather high Mn/Fe. A Type Ia origin can explain the Mn abundance, while it predicts much higher ejecta masses than observed values for all the metal species considered in our analysis.
description: 29 pages, 9 figures, accepted for publication in ApJ
Problemy funkcjonowania i rozwoju rodzinnych gospodarstw mlecznych w Polsce na tle uwarunkowań światowych
Creators: name: Brodzińska, Katarzyna
name: Brodzińska, Katarzyna
Publisher: name: Unknown
Year: 2016
Subjects: subject: Agribusiness
subject: Community/Rural/Urban Development
subject: Farm Management
subject: International Development
subject: dairy farms
subject: concentration of production
subject: farm management
subject: / gospodarstwa mleczne
subject: koncentracja produkcji
subject: organizacja gospodarstw

description: Family dairy farms have played a major role in the history of Polish agriculture. Because of this, it is important to assess the factors of their development after milk quotas were abolishment. Source material is comprised of results of the author’s own research, carried out in 2016. This involved 69 dairy farm owners from the Warmian-Masurian region. The analysis also involved statistical data on the functioning of dairy farms. The conducted analysis ranks Poland as a major producer of cow milk in the European Union (4th) and in the world (12th). Integration with the EU resulted in increased concentration of production and cow efficiency. Investments made by dairy farms in the last few years have increased their competitiveness. However, they were often financed from loans. The decrease of milk profitability, caused by not maintaining production quotas, high penalties for overproduction, as well as the necessity of paying off loan installments, have led to financial problems for many family dairy farms. / Synopsis. Rodzinne gospodarstwa mleczne odegrały znaczącą rolę w historii polskiego rolnictwa i dlatego ważne jest określenie czynników determinujących możliwości ich rozwoju po zniesieniu kwot mlecznych. Materiał badawczy stanowiły wyniki badań własnych z 2016 roku, którymi objęto 69 właścicieli gospodarstw mlecznych z województwa warmińsko-mazurskiego oraz dane statystyczne. Z przeprowadzonych analiz wynika, że Polska jest znaczącym producentem mleka krowiego w Unii Europejskiej (4) i na świecie (12). Po integracji z UE nastąpiła koncentracja produkcji i poprawa wydajności mlecznej krów. Przeprowadzone w ostatnich latach inwestycje w gospodarstwach mlecznych przyczyniły się do poprawy ich konkurencyjności, ale stanowiły duże obciążenie kredytowe. Spadek opłacalności cen mleka związany z zaprzestaniem jego kwotowania, wysokie kary za nadprodukcję i konieczność spłacania rat kredytów spowodowały problemy finansowe wielu rodzinnych gospodarstw mlecznych i zagrażają ich trwałości.
The continuous spin limit of higher spin field equations
Creators: name: Bekaert, X.
name: Mourad, J.
Publisher: name: arXiv
Year: 2005
Subjects: subject: High Energy Physics - Theory (hep-th)
subject: FOS: Physical sciences

description: We show that the Wigner equations describing the continuous spin representations can be obtained as a limit of massive higher-spin field equations. The limit involves a suitable scaling of the wave function, the mass going to zero and the spin to infinity with their product being fixed. The result allows to transform the Wigner equations to a gauge invariant Fronsdal-like form. We also give the generalisation of the Wigner equations to higher dimensions with fields belonging to arbitrary representations of the massless little group.
description: 18 pages, JHEP style. Typos corrected, references added
Stan i perspektywy rozwoju polskiego handlu zagranicznego owocami, warzywami i ich przetworami z Turcją
Creators: name: Bugała, Anna
name: Bugała, Anna
Publisher: name: Unknown
Year: 2016
Subjects: subject: Agribusiness
subject: Agricultural and Food Policy
subject: International Relations/Trade
subject: export
subject: import
subject: fruits
subject: vegetables
subject: processed fruits and vegetables
subject: / eksport
subject: owoce
subject: warzywa
subject: przetwory owocowe i warzywne

description: Turkey is Poland’s main trading partner from Asia and the Middle East. From 2006-2014 the balance of Polish foreign trade in fruits, vegetables and their derivatives with Turkey was negative. The author undertakes an attempt to assess the situation and outlook of Polish trade in fresh and processed fruits and vegetables with Turkey, with particular focus on the situation and development possibilities of the Turkish horticultural sector on the path to EU accession. / Synopsis. Turcja jest głównym partnerem handlowym Polski z rejonu Bliskiego Wschodu i Azji. Saldo handlu zagranicznego owocami, warzywami i ich przetworami pomiędzy Polską i Turcją w latach 2006-2014 było ujemne. Autor podejmuje próbę oceny stanu i perspektyw rozwoju krajowego handlu owocami, warzywami i ich przetworami z Turcją. Szczególną uwagę poświęca sytuacji i możliwościom rozwoju tureckiego sektora ogrodniczego w trakcie dążenia tego kraju do członkostwa w UE.