cometadata/datacite-rtg-text-other-reclassification-records huggingface dataset:
On the Dependence Structure of European Vegetable Oil Markets
Creators: name: Menier, Romain
name: Bagnarosa, Guillaume
name: Gohin, Alexandre
name: Menier, Romain
name: Bagnarosa, Guillaume
name: Gohin, Alexandre
Publisher: name: Unknown
Year: 2022
Subjects: subject: Public Economics
subject: Resource /Energy Economics and Policy
subject: vegetable oil
subject: price discovery
subject: volatility

description: Motivated by the current context of high and volatile energy and food prices, we examine the conditional variance-covariance matrix dynamics and price discovery process characterising European vegetable oils. In addition to outcomes differences using daily or monthly datasets, we find that both the marginal distributions and volatility dependence structures relate to distinct economic fundamentals. The energy price mainly influences the vegetable oil trend component, and stock-to-use ratios are crucial for variance-covariance dynamics once their particular cold filter plugging point is considered. This latter point also reveals interesting interplays among vegetable oils according to the economic concepts of complementarity and substitutability.
Controlling local currents in molecular junctions
Creators: name: Yadalam, Hari Kumar
name: Harbola, Upendra
Publisher: name: arXiv
Year: 2016
Subjects: subject: Mesoscale and Nanoscale Physics (cond-mat.mes-hall)
subject: Other Condensed Matter (cond-mat.other)
subject: Chemical Physics (physics.chem-ph)
subject: FOS: Physical sciences

description: The effect of non-equilibrium constraints and dephasing on the circulating currents in molecular junctions are analyzed. Circulating currents are manifestations of quantum effects and can be induced either by externally applied bias or an external magnetic field through the molecular system. In symmetric Aharonov-Bohm ring, bond currents have two contributions, bias driven and magnetic field driven. We analyze the competition between these two contributions and show that, as a consequence, current through one of the branches can be completely suppressed. We then study the effect of asymmetry (as a result of chemical substitution) on the current pathways inside the molecule and study asymmetry induced circulating currents (without magnetic field) by tuning the coupling strength of the substituent (at finite bias).
description: 16 pages, 14 figures
The Robo-AO KOI Survey: laser adaptive optics imaging of every Kepler exoplanet candidate
Creators: name: Ziegler, Carl
name: Law, Nicholas M.
name: Baranec, Christoph
name: Morton, Tim
name: Riddle, Reed
name: Atkinson, Dani
name: Nofi, Larissa
Publisher: name: arXiv
Year: 2016
Subjects: subject: Earth and Planetary Astrophysics (astro-ph.EP)
subject: FOS: Physical sciences

description: The Robo-AO Kepler Planetary Candidate Survey is observing every Kepler planet candidate host star (KOI) with laser adaptive optics imaging to hunt for blended nearby stars which may be physically associated companions. With the unparalleled efficiency provided by the first fully robotic adaptive optics system, we perform the critical search for nearby stars (0.15" to 4.0" separation with contrasts up to 6 magnitudes) that dilute the observed planetary transit signal, contributing to inaccurate planetary characteristics or astrophysical false positives. We present 3313 high resolution observations of Kepler planetary hosts from 2012-2015, discovering 479 nearby stars. We measure an overall nearby star probability rate of 14.5\pm0.8%. With this large data set, we are uniquely able to explore broad correlations between multiple star systems and the properties of the planets which they host, providing insight into the formation and evolution of planetary systems in our galaxy. Several KOIs of particular interest will be discussed, including possible quadruple star systems hosting planets and updated properties for possible rocky planets orbiting with in their star's habitable zone.
description: 17 pages, 10 figures, presented at SPIE Astronomical Telescopes + Instrumentation
The nonequilibrium glassy dynamics of self-propelled particles
Creators: name: Flenner, Elijah
name: Szamel, Grzegorz
name: Berthier, Ludovic
Publisher: name: arXiv
Year: 2016
Subjects: subject: Soft Condensed Matter (cond-mat.soft)
subject: Statistical Mechanics (cond-mat.stat-mech)
subject: FOS: Physical sciences

description: We study the glassy dynamics taking place in dense assemblies of athermal active particles that are driven solely by a nonequilibrium self-propulsion mechanism. Active forces are modeled as an Ornstein-Uhlenbeck stochastic process, characterized by a persistence time and an effective temperature, and particles interact via a Lennard-Jones potential that yields well-studied glassy behavior in the Brownian limit, obtained as the persistence time vanishes. By increasing the persistence time, the system departs more strongly from thermal equilibrium and we provide a comprehensive numerical analysis of the structure and dynamics of the resulting active fluid. Finite persistence times profoundly affect the static structure of the fluid and give rise to nonequilibrium velocity correlations that are absent in thermal systems. Despite these nonequilibrium features, for any value of the persistence time we observe a nonequilibrium glass transition as the effective temperature is decreased. Surprisingly, increasing departure from thermal equilibrium is found to promote (rather than suppress) the glassy dynamics. Overall, our results suggest that with increasing persistence time, microscopic properties of the active fluid change quantitatively, but the broad features of the nonequilibrium glassy dynamics observed with decreasing the effective temperature remain qualitatively similar to those of thermal glass-formers.
ESO 243-49 HLX-1: scaling of X-ray spectral properties and black hole mass determination
Creators: name: Titarchuk, Lev
name: Seifina, Elena
Publisher: name: arXiv
Year: 2016
Subjects: subject: High Energy Astrophysical Phenomena (astro-ph.HE)
subject: FOS: Physical sciences

description: We report the results of Swift/XRT observations (2008-2015) of a hyper-luminous X-ray source, ESO 243-49 HLX-1. We found a strong observational evidence that ESO 243-49 HLX-1 underwent spectral transitions from the low/hard state to the high/soft state during these observations. The spectra of ESO 243-49 HLX-1 are well fitted by the so-{called} bulk motion Comptonization model for all spectral states. We have established the photon index Gamma saturation level, Gamma_{sat}$=3.0+/-0.1, in the correlation of Gamma versus mass accretion rate dot M. This Gamma-dot M correlation allows us to estimate the black hole (BH) mass in ESO 243-49 HLX-1 to be M_{BH}~ 7x 10^4 solar masses, assuming the distance to ESO 243-49 of 95 Mpc. For the BH mass estimate we used the scaling method, taking Galactic BHs XTE~J1550-564, H~1743-322 and 4U~1630-472, and an extragalactic BH source, M101 ULX-1 as reference sources. The Gamma-dot M correlation revealed in ESO 243-49 HLX-1 is similar to those in a number of Galactic and extragalactic BHs and it clearly shows the correlation along with the strong Gamma saturation at ~ 3. This is a reliable observational evidence of a BH in ESO 243-49 HLX-1. We also found that the seed (disk) photon temperatures are quite low, of order of 50-140 eV which are consistent with a high BH mass in ESO 243-49 HLX-1.
description: 21 pages, 8 figures, accepted by Astronomy and Astrophysics on August 29, 2016
Universal behavior for single-file diffusion on a disordered fractal
Creators: name: Padilla, L.
name: Mártin, H. O.
name: Iguain, J. L.
Publisher: name: arXiv
Year: 2016
Subjects: subject: Statistical Mechanics (cond-mat.stat-mech)
subject: FOS: Physical sciences

description: We study single-file diffusion on a one-dimensional lattice with a random fractal distribution of hopping rates. For finite lattices, this problem shows three clearly different regimes, namely, nearly independent particles, highly interacting particles, and saturation. The mean-square displacement of a tagged particle as a function of time follows a power law in each regime. The first crossover time $t_s$, between the first and the second regime, depends on the particle density. The other crossover time $t_l$, between the second and the third regime, depends on the lattice length. We find analytic expressions for these dependencies and show how the general behavior can be characterized by an universal form. We also show that the mean-square displacement of the center of mass presents two regimes; anomalous diffusion for times shorter than $t_l$, and normal diffusion for times longer than $t_l$. We study single-file diffusion on a one-dimensional lattice with a random fractal distribution of hopping rates. For finite lattices, this problem shows three clearly different regimes, namely, nearly independent particles, highly interacting particles, and saturation. The mean-square displacement of a tagged particle as a function of time follows a power law in each regime. The first crossover time $t_s$, between the first and the second regime, depends on the particle density. The other crossover time $t_l$, between the second and the third regime, depends on the lattice length. We find analytic expressions for these dependencies and show how the general behavior can be characterized by an universal form. We also show that the mean-square displacement of the center of mass presents two regimes; anomalous diffusion for times shorter than $t_l$, and normal diffusion for times longer than $t_l$.
description: 13 pages, 7 figures
Policy brief: Why do people migrate? Where do they choose to migrate?
Creators: name: Sánchez Gassen, Nora
name: Heleniak, Timothy
Publisher: name: Zenodo
Year: 2023
Subjects: migration drivers
future migration patterns

description: Today, approximately 3.4 percent of the world’s population are international migrants – people living outside their country of birth. In the future, the number of people who move from one country to another may increase due to population growth in developing countries, increased mobility, political unrest in some world regions, and climate change. The question is how much may international migration flows increase and where will migrants go?
 The Horizon 2020 project Future migration scenarios for Europe (FUME) focuses on understanding the patterns, motivations, and modalities of migration at multiple geographical scales, from international through regional to the local, and on developing possible future scenarios of migration to Europe. These scenarios shall improve our understanding of the complexity and diversity of migration – and support migration, integration, labour market and cohesion policies at different governance levels.
 This policy brief answers key FUME research questions, summarizes important project findings, and presents policy recommendations. It is based on fieldwork carried out in selected countries of origin including in-depth individual and group interviews of migrants, a review of migration literature, an expert survey of migration researchers, and a Delphi survey of migration experts.
Generalizations of Furstenberg's Diophantine result
Creators: name: Katz, Asaf
Publisher: name: arXiv
Year: 2016
Subjects: subject: Dynamical Systems (math.DS)
subject: Number Theory (math.NT)
subject: FOS: Mathematics

description: We prove two generalizations of Furstenberg's Diophantine result regarding density of an orbit of an irrational point in the one-torus under the action of multiplication by a non-lacunary multiplicative semi-group of $\mathbb{N}$. We show that for any sequences $\{a_{n} \},\{b_{n} \}\subset\mathbb{Z}$ for which the quotients of successive elements tend to $1$ as $n$ goes to infinity, and any infinite sequence $\{c_{n} \}$, the set $\{a_{n}b_{m}c_{k}x : n,m,k\in\mathbb{N} \}$ is dense modulo $1$ for every irrational $x$. Moreover, by ergodic-theoretical methods, we prove that if $\{a_{n} \},\{b_{n} \}$ are sequence having smooth $p$-adic interpolation for some prime number $p$, then for every irrational $x$, the sequence $\{p^{n}a_{m}b_{k}x : n,m,k\in\mathbb{N} \}$ is dense modulo 1.
On Delta Graphs and Delta Conjecture
Creators: name: Navarro, Pedro Díaz
Publisher: name: arXiv
Year: 2016
Subjects: subject: Combinatorics (math.CO)
subject: FOS: Mathematics

description: In this paper we define two infinite families of graphs called C-$δ$ graphs and $δ$- graph and prove that $δ$-graphs satisfy $δ$ conjecture. Also we introduce a family of C-$δ$ graphs from which we can identify $δ$ graphs as their complements. Finally we give a list of C-$δ$ graphs and the relationship with their minimum semidefinite rank.
description: !9 pages, two figures. This is a version 1 of a final paper. It was submitted to the journal"Revista de Matem\'atica: Teor\'ia y Aplicaciones" in Costa Rica to be published
String states, loops and effective actions in noncommutative field theory and matrix models
Creators: name: Steinacker, Harold C.
Publisher: name: arXiv
Year: 2016
Subjects: subject: High Energy Physics - Theory (hep-th)
subject: FOS: Physical sciences

description: Refining previous work by Iso, Kawai and Kitazawa, we discuss bi-local string states as a tool for loop computations in noncommutative field theory and matrix models. Defined in terms of coherent states, they exhibit the stringy features of noncommutative field theory. This leads to a closed form for the 1-loop effective action in position space, capturing the long-range non-local UV/IR mixing for scalar fields. The formalism applies to generic fuzzy spaces. The non-locality is tamed in the maximally supersymmetric IKKT or IIB model, where it gives rise to supergravity. The linearized supergravity interactions are obtained directly in position space at one loop using string states on generic noncommutative branes.
description: 31 pages, 2 figures
Could an equity index fund emerge as a new form of currency?
Creators: name: Romani, Christophe
Publisher: name: Zenodo
Year: 2021
Subjects: Moneys
Currencies
Moneyness
Equity index funds

description: The financial innovations of the last decades have led to the emergence of equity index funds that are increasingly popular among investors. From an economic point of view, these funds have a stronger moneyness than contemporary currencies, particularly in terms of scarcity, accumulation practice and natural return. A specific equity index fund, based for example on the MSCI World index, would be therefore a serious candidate to act as a currency in the near future.
Un fond indiciel en actions pourrait-il faire office de monnaie ?
Creators: name: Romani, Christophe
Publisher: name: Zenodo
Year: 2023
Subjects: Monnaie
Devise
Liquidité
Qualités monétaires
Fonds indiciel en actions
Money
Currency
Liquidity
Monetary qualities
Equity index fund

description: Les innovations financières des dernières décennies ont permis l’émergence de fonds indiciels en actions, dont la popularité est croissante auprès des épargnants. D’un point de vue économique, ces fonds présentent des qualités monétaires remarquables. The financial innovations of recent decades have led to the emergence of equity index funds, which are becoming increasingly popular among investors. From an economic point of view, these funds have remarkable monetary qualities.
Anomalous Double-Mode RR Lyrae Stars in the Magellanic Clouds
Creators: name: Soszyński, I.
name: Smolec, R.
name: Dziembowski, W. A.
name: Udalski, A.
name: Szymański, M. K.
name: Wyrzykowski, L.
name: Ulaczyk, K.
name: Poleski, R.
name: Pietrukowicz, P.
name: Kozlowski, S.
name: Skowron, D.
name: Skowron, J.
name: Mróz, P.
name: Pawlak, M.
Publisher: name: arXiv
Year: 2016
Subjects: subject: Solar and Stellar Astrophysics (astro-ph.SR)
subject: FOS: Physical sciences

description: We report the discovery of a new subclass of double-mode RR Lyrae stars in the Large and Small Magellanic Clouds. The sample of 22 pulsating stars have been extracted from the latest edition of the OGLE collection of RR Lyrae variables in the Magellanic System. The stars pulsating simultaneously in the fundamental (F) and first-overtone (1O) modes have distinctly different properties than regular double-mode RR Lyrae variables (RRd stars). The $P_{1O}/P_F$ period ratios of our anomalous RRd stars are within a range 0.725-0.738, while "classical" double-mode RR Lyrae variables have period ratios in the range 0.742-0.748. In contrast to the typical RRd stars, in the majority of the anomalous pulsators the F-mode amplitudes are higher than the 1O-mode amplitudes. The light curves associated with the F-mode in the anomalous RRd stars show different morphology than the light curves of, both, regular RRd stars and single-mode RRab stars. Most of the anomalous double-mode stars show long-term modulations of the amplitudes (Blazhko-like effect). Translating the period ratios into the abundance parameter, Z, we find for our stars Z in the range (0.002,0.005) - an order of magnitude higher values than typical for RR Lyrae stars. The mass range of the RRd stars inferred from the $W_I$ vs. $P_F$ diagram is (0.55-0.75) of the solar mass. These parameters cannot be accounted for with single star evolution assuming a Reimers-like mass loss. Much greater mass loss caused by interaction with other stars is postulated. We blame the peculiar pulsation properties of our stars to the parametric resonance instability of the 1O-mode to excitation of the F- and 2O-modes as with the inferred parameters of the stars $2ω_{\rm 1O}\approxω_{\rm F}+ω_{\rm 2O}$.
description: 11 pages, 7 figures, accepted for publication in MNRAS
Editorial Introduction: Digital competence in teacher education across Europe
Creators: name: MC DONAGH, ADRIAN
name: H. Giæver, Tonje
name: Mifsud, Louise
name: Milton, Josephine
Publisher: name: University of Limerick
Year: 2023
Subjects: Education

description: Background and Rationale The rationale for this special issue is based on the increasing and now almost ubiquitous use of technology in teaching and learning. As the exposure to technology in the classroom increases, so too will the requirement for all teachers to be digitally competent in its use for classroom teaching and learning. This special issue aims to evaluate student teachers' attitudes towards ICT, their understanding of digital competence, and how teacher training institutions prepare them to work in an ever-changing and evolving digital classroom. This special issue will also examine “digital distractions” viewed as potential downsides in the digitisation of classrooms. Furthermore, this publication will propose a new digital competence framework that includes Pedagogical, Ethical, Attitudinal, and Technological (PEAT) elements. It will discuss the rationale for its creation and the affordances that this framework offers.
Could an equity index fund emerge as a new form of money?
Creators: name: Romani, Christophe
Publisher: name: Zenodo
Year: 2023
Subjects: Money
Currency
Liquidity
Monetary qualities
Equity index fund

description: The financial innovations of recent decades have led to the emergence of equity index funds, which are becoming increasingly popular among investors. From an economic point of view, these funds have remarkable monetary qualities.
On the method of strained parameters for a KdV type of equation with exact dispersion property
Creators: name: Karjanto, N.
Publisher: name: arXiv
Year: 2016
Subjects: subject: Fluid Dynamics (physics.flu-dyn)
subject: FOS: Physical sciences
subject: 35Q53, 76B15, 35B25, 76M45

description: This paper provides an alternative methodology for analysis of three-wave interactions under the exact dispersion relation associated with gravity waves in fluid of intermediate depth. A Korteweg-de Vries type of equation with exact dispersion property is adopted as the governing equation for unidirectional wave packet evolution. Following the idea from Zakharov's seminal paper (Zakharov, V. E. (1968) Stability of periodic waves of finite amplitude on the surface of a deep fluid. \textit{Journal of Applied Mechanics and Technical Physics}, {\bf 9}, 190--194), the equation is transformed from the spatial--temporal domain to the wavenumber--temporal domain. The solution of the transformed equation is sought using the perturbation theory, for which the ansatz is expressed in the form of a regular expansion in the increasing order of a small parameter. After implementing the naïve perturbation method, due to nonlinear mode generation and particular combinations of wavenumbers, the third-order solution contains spurious secular growth terms which appear as a consequence of resonant interaction and nonlinear mode generation. These spurious secular growth terms can be prevented by implementing the method of strained parameters for which nonlinear dispersion relation terms are produced for particular combination of wavenumbers.
description: 13 pages, Advance Access publication on 6 June 2014
title: Sarsen stone in southern Britain: an archaeological and ethno-historical approach to an ancient industry
Creators: name: Whitaker, Katy A.
Publisher: name: University of Reading
Year: 2023

description: This thesis is an inter-disciplinary study of human engagement with the silcrete called sarsen stone, found dispersed across parts of south-central and south-eastern England and used prolifically since prehistory. Prehistoric sarsen megaliths (for example, Stonehenge) have dominated discussion of the cultural contexts of its use, but it enjoys a far longer relationship with people and, in those places where it is most abundant, more recent architectural sarsen fabric is an integral component informing sense-of-place. This thesis reveals the variety of Neolithic sarsen engagement, drawing that together with postmedieval sarsen industries to foreground some of the many ways that it has been exploited. By focussing on different chaînes opératoires studied through archaeological and ethnohistorical sources, I propose that sarsen stone behaves as a different material depending on the technical action applied to it and thus has the potential for varied ontological status dependent on context. A collection of six published papers, this thesis first contextualises archaeological perceptions of sarsen stone that have dominated scholarly study thus far. Newly-digitised datasets from the archived collections of twentieth century sarsen surveys are considered. Secondly, different modes of sarsen exploitation are explored through multi-scalar methodologies. A landscape approach is applied to quarries in Buckinghamshire and Wiltshire study areas, combining aerial investigation and analytical earthworks surveys with an eclectic range of archival sources to cast light on traditional sarsen-working practices. A new methodology, developed to habilitate excavated sarsen assemblages into archaeological analysis, is applied to material from Neolithic sites in Wiltshire including Marden henge and West Kennet Avenue, which with data from the Windmill Hill enclosure shows how common non-megalithic uses of sarsen were. Value in attending to this previously under-studied material in its own right is demonstrated, encouraging more detailed analysis in future research.
Inter-organizational Coordination towards Youth Employment: The Case of the Addis Ababa City Administration
Creators: name: Hagos, Atakilt
Publisher: name: African Journal of Leadership and Development
Year: 2019

description: Youth unemployment is among the challenges in urban centers of Ethiopia that requires coordination among various actors. This study assessed the practice in the public sector in using certain coordination mechanisms and instruments and their effectiveness in enhancing youth employment in the case of the Addis Ababa City Administration. In assessing the practice, three coordination mechanisms as well as 16 coordination instruments were considered. This study also analyzed the effect of the degree of practice in using the coordination mechanisms on the degree of effectiveness of those mechanisms. To meet the objectives, the descriptive and explanatory research designs were employed. Primary data were obtained from 230 properly-filled questionnaires drawn from 16 government entities (Bureaus, Sub-city-level offices and TVET colleges). The data were analyzed using descriptive statistics (including correlation analysis) and regression analysis. Some findings are drawn based on the results. First, the practice in using the coordination instruments under the hierarchy-type, market-type and the network-type mechanisms as well as the effectiveness of the coordination instruments generally ranged from medium to low/very low. Second, the effect of the degree of practice on the degree of effectiveness is found to be positive and significant. Nevertheless, further research that controls for other determinants of effectiveness is required. The overall conclusion is that urban youth employment coordination in the study area is not strong (i.e., there is coordinating problem). As a result, the effectiveness of the coordination instruments has also been limited. To address the coordination problem, certain courses of action are recommended.
description: African Journal of Leadership and Development, Vol. 4 No. 1 (2019): Work Environment, Service Delivery and Organizational Connectivity
Linear polarization study of microwave-radiation-induced magnetoresistance oscillations: Comparison of power dependence to theory
Creators: name: Ye, Tianyu
name: Inarrea, Jesus
name: Wegscheider, W.
name: Mani, R. G.
Publisher: name: arXiv
Year: 2016
Subjects: subject: Mesoscale and Nanoscale Physics (cond-mat.mes-hall)
subject: FOS: Physical sciences

description: We present an experimental study of the microwave power and the linear polarization angle dependence of the microwave-induced magnetoresistance oscillations in the high-mobility GaAs/AlGaAs two-dimensional electron system. Experimental results show the sinusoidal dependence of the oscillatory magnetoresistance extrema as a function of the polarization angle. Yet, as the microwave power increases, the angular dependence includes additional harmonic content, and it begins to resemble the absolute value of the cosine function. We present a theory to explain such peculiar behavior.
New detections of embedded clusters in the Galactic halo
Creators: name: Camargo, Denilso
name: Bica, Eduardo
name: Bonatto, Charles
Publisher: name: arXiv
Year: 2016
Subjects: subject: Astrophysics of Galaxies (astro-ph.GA)
subject: Solar and Stellar Astrophysics (astro-ph.SR)
subject: FOS: Physical sciences

description: Until recently it was thought that high Galactic latitude clouds were a non-star-forming ensemble. However, in a previous study we reported the discovery of two embedded clusters (ECs) far away from the Galactic plane ($\sim5$ kpc). In our recent star cluster catalogue we provided additional high and intermediate latitude cluster candidates. This work aims to clarify if our previous detection of star clusters far away from the disc represents just an episodic event or if the star cluster formation is currently a systematic phenomenon in the Galactic halo. We analyse the nature of four clusters found in our recent catalogue and report the discovery of three new ECs with unusually high latitude and distance from the Galactic disc midplane. All of these clusters are younger than 5 Myr. The high-latitude ECs C 932, C 934, and C 939 appear to be related to a cloud complex about 5 kpc below the Galactic disc, under the Local arm. The other clusters are above the disc, C 1074 and C 1100 with a vertical distance of $\sim3$ kpc, C 1099 with $\sim2$ kpc, and C 1101 with $\sim1.8$ kpc. According to the derived parameters there occur ECs located below and above the disc, which is an evidence of widespread star cluster formation throughout the Galactic halo. Thus, this study represents a paradigm shift, in the sense that a sterile halo becomes now a host of ongoing star formation. The origin and fate of these ECs remain open. There are two possibilities for their origin, Galactic fountain or infall. The discovery of ECs far from the disc suggests that the Galactic halo is more actively forming stars than previously thought and since most ECs do not survive the \textit{infant mortality} it may be raining stars from the halo into the disc, and/or the halo harbours generations of stars formed in clusters like those hereby detected.
description: 9 pages, 11 figures
Tent-transformed lattice rules for integration and approximation of multivariate non-periodic functions
Creators: name: Cools, Ronald
name: Kuo, Frances Y.
name: Nuyens, Dirk
name: Suryanarayana, Gowri
Publisher: name: arXiv
Year: 2016
Subjects: subject: Numerical Analysis (math.NA)
subject: FOS: Mathematics

description: We develop algorithms for multivariate integration and approximation in the weighted half-period cosine space of smooth non-periodic functions. We use specially constructed tent-transformed rank-1 lattice points as cubature nodes for integration and as sampling points for approximation. For both integration and approximation, we study the connection between the worst-case errors of our algorithms in the cosine space and the worst-case errors of some related algorithms in the well-known weighted Korobov space of smooth periodic functions. By exploiting this connection, we are able to obtain constructive worst-case error bounds with good convergence rates for the cosine space.
description: Journal of Complexity, Available online 26 May 2016
SRAO: optical design and the dual-knife-edge WFS
Creators: name: Ziegler, Carl
name: Law, Nicholas M.
name: Tokovinin, Andrei
Publisher: name: arXiv
Year: 2016
Subjects: subject: Instrumentation and Methods for Astrophysics (astro-ph.IM)
subject: FOS: Physical sciences

description: The Southern Robotic Adaptive Optics (SRAO) instrument will bring the proven high-efficiency capabilities of Robo-AO to the Southern-Hemisphere, providing the unique capability to image with high-angular-resolution thousands of targets per year across the entire sky. Deployed on the modern 4.1m SOAR telescope located on Cerro Tololo, the NGS-AO system will use an innovative dual-knife-edge wavefront sensor, similar to a pyramid sensor, to enable guiding on targets down to V=16 with diffraction limited resolution in the NIR. The dual-knife-edge wavefront sensor can be up to two orders of magnitude less costly than custom glass pyramids, with similar wavefront error sensitivity and minimal chromatic aberrations. SRAO is capable of observing hundreds of targets a night through automation, allowing confirmation and characterization of the large number of exoplanets produced by current and future missions.
description: 6 pages, 5 figures, presented at SPIE Astronomical Telescopes + Instrumentation
Linear stability analysis and direct numerical simulation of two layer channel flow
Creators: name: Sahu, Kirti Chandra
name: Govindarajan, Rama
Publisher: name: arXiv
Year: 2016
Subjects: subject: Fluid Dynamics (physics.flu-dyn)
subject: FOS: Physical sciences

description: We study the stability of two-fluid flow through a plane channel at Reynolds numbers of a hundred to a thousand in the linear and nonlinear regimes. The two fluids have the same density but different viscosities. The fluids, when miscible, are separated from each other by a mixed layer of small but finite thickness, across which viscosity changes from that of one fluid to that of the other. When immiscible, the interface is sharp. Our study spans a range of Schmidt numbers, viscosity ratios and location and thickness of the mixed layer. A region of instability distinct from that of the Tollmien-Schlichting mode is obtained at moderate Reynolds numbers. We show that the overlap of the layer of viscosity-stratification with the critical layer of the dominant disturbance provides a mechanism for this instability. At very low values of diffusivity, the miscible flow behaves exactly like the immiscible in terms of stability characteristics. High levels of miscibility make the flow more stable. At intermediate levels of diffusivity however, in both linear and non-linear regimes, miscible flow can be more unstable than the corresponding immiscible flow without surface tension.
description: 14 pages, 12 figures
Topological insulator in a helicoidal magnetization field
Creators: name: Stagraczynski, S.
name: Chotorlishvili, L.
name: Dugaev, V. K.
name: Jia, C. -L.
name: Ernst, A.
name: Komnik, A.
name: Berakdar, J.
Publisher: name: arXiv
Year: 2016
Subjects: subject: Mesoscale and Nanoscale Physics (cond-mat.mes-hall)
subject: FOS: Physical sciences

description: A key feature of topological insulators is the robustness of the electron energy spectrum. At a surface of a topological insulator, Dirac point is protected by the characteristic symmetry of the system. The breaking of the symmetry opens a gap in the energy spectrum. Therefore, topological insulators are very sensitive to magnetic fields, which can open a gap in the electronic spectrum. Concerning "internal" magnetic effects, for example the situation with doped magnetic impurities, is not trivial. A single magnetic impurity is not enough to open the band gap, while in the case of a ferromagnetic chain of deposited magnetic impurities the Dirac point is lifted. However, a much more interesting case is when localized magnetic impurities form a chiral spin order. Our first principle density functional theory calculations have shown that this is the case for Fe deposited on the surface of Bi2Se3 topological insulator. But not only magnetic impurities can form a chiral helicoidal spin texture. An alternative way is to use chiral multiferroics (prototype material is LiCu2O2) that induce a proximity effect. The theoretical approach we present here is valid for both cases. We observed that opposite to a ferromagnetically ordered case, a chiral spin order does not destroy the Dirac point. We also observed that the energy gap appears at the edges of the new Brillouin zone. Another interesting result concerns the spin dynamics. We derived an equation for the spin density dynamics with a spin current and relaxation terms. We have shown that the motion of the conductance electron generates a magnetic torque and exerts a certain force on the helicoidal texture.
description: 10 pages, 10 figures, accepted for publication in Phys. Rev. B
Continuum approach for long-wavelength acoustic phonons in quasi-2D structures
Creators: name: Liu, Dan
name: Every, Arthur G.
name: Tomanek, David
Publisher: name: arXiv
Year: 2016
Subjects: subject: Mesoscale and Nanoscale Physics (cond-mat.mes-hall)
subject: FOS: Physical sciences

description: As an alternative to atomistic calculations of long-wavelength acoustic modes of atomically thin layers, which are known to converge very slowly, we propose a quantitatively predictive and physically intuitive approach based on continuum elasticity theory. We describe a layer, independent of its thickness, by a membrane, characterize its elastic behavior by a $(3{\times}3)$ elastic matrix as well as the flexural rigidity. We present simple quantitative expressions for frequencies of long-wavelength acoustic modes, which we determine using 2D elastic constants calculated by {\em ab initio} Density Functional Theory. The calculated spectra accurately reproduce observed and calculated long-wavelength phonon spectra of graphene and phosphorene, the monolayer of black phosphorus. Our approach also correctly describes the observed dependence of the radial breathing mode frequency on the diameter of carbon fullerenes and nanotubes.
description: Accepted by Physical Review B (2016)
Electron Teleportation in Multi-Terminal Majorana Islands: Statistical Transmutation and Fractional Quantum Conductance
Creators: name: Michaeli, Karen
name: Landau, L. Aviad
name: Sela, Eran
name: Fu, Liang
Publisher: name: arXiv
Year: 2016
Subjects: subject: Mesoscale and Nanoscale Physics (cond-mat.mes-hall)
subject: Strongly Correlated Electrons (cond-mat.str-el)
subject: Superconductivity (cond-mat.supr-con)
subject: FOS: Physical sciences

description: We study a topological superconductor island with spatially separated Majorana modes coupled to multiple normal metal leads by single electron tunneling in the Coulomb blockade regime. We show that low-temperature transport in such Majorana island is carried by an emergent charge-$e$ boson composed of a Majorana mode and an electron from the leads. This transmutation from Fermi to Bose statistics has remarkable consequences. For noninteracting leads, the system flows to a non-Fermi liquid fixed point, which is stable against tunnel couplings anisotropy or detuning away from the charge-degeneracy point. As a result, the system exhibits a universal conductance at zero temperature, which is a fraction of the conductance quantum, and low-temperature corrections with a universal power-law exponent. In addition, we consider Majorana islands connected to interacting one-dimensional leads, and find different stable fixed points near and far from the charge-degeneracy point.
description: 10+ pages, 5 figures
Magnon-phonon coupling and two-magnon continuum in two-dimensional triangular antiferromagnet CuCrO2
Creators: name: Park, Kisoo
name: Oh, Joosung
name: Leiner, Jonathan C.
name: Jeong, Jaehong
name: Rule, Kirrily C.
name: Le, Manh Duc
name: Park, Je-Geun
Publisher: name: arXiv
Year: 2016
Subjects: subject: Strongly Correlated Electrons (cond-mat.str-el)
subject: Materials Science (cond-mat.mtrl-sci)
subject: FOS: Physical sciences

description: CuCrO2 is a manifestation of a two-dimensional triangular antiferromagnet which exhibits an incommensurate noncollinear magnetic structure similar to a classical 120 degree ordering. Using the inelastic neutron scattering technique, direct evidence of a magnon-phonon coupling in CuCrO2 is revealed via the mixed magnon-phonon character of the excitation mode at 12.5 meV as well as a minimum at the zone boundary. A simple model Hamiltonian that incorporates an exchange striction type magnon-phonon coupling reproduces the observed features accurately. Also, continuum excitations originating from the interaction between quasiparticles are observed with strong intensity at the zone boundary. These features of the magnetic excitations are key to an understanding of the emergent excitations in noncollinear antiferromagnetic compounds.
description: 6 pages, 4 figures, Physical Review B accepted
The quest for the largest depleted galaxy core: supermassive black hole binaries and stalled in-falling satellites
Creators: name: Bonfini, Paolo
name: Graham, Alister W.
Publisher: name: arXiv
Year: 2016
Subjects: subject: Astrophysics of Galaxies (astro-ph.GA)
subject: FOS: Physical sciences

description: Partially-depleted cores are practically ubiquitous in luminous early-type galaxies (M$_{B}\lesssim-$20.5 mag), and typically smaller than 1 kpc. In one popular scenario, supermassive black hole binaries --- established during dry (i.e. gas-poor) galaxy mergers --- kick out the stars from a galaxy's central region via three-body interactions. Here, this "binary black hole scouring scenario" is probed at its extremes by investigating the two galaxies reported to have the largest partially-depleted cores found to date: 2MASX~J09194427+5622012 and 2MASX~J17222717+3207571 (the brightest galaxy in Abell~2261). We have fit these galaxy's two-dimensional light distribution using the core-Sérsic model, and found that the former galaxy has a core-Sérsic break radius $R_{b,cS}=0.55$~kpc, three times smaller than the published value. We use this galaxy to caution that other reportedly large break radii may too have been over-estimated if they were derived using the "sharp-transition" (inner core)-to-(outer Sérsic) model. In the case of 2MASX~J17222717+3207571, we obtain $R_{b,cS}=3.6$~kpc. While we confirm that this is the biggest known partially-depleted core of any galaxy, we stress that it is larger than expected from the evolution of supermassive black hole binaries --- unless one invokes substantial gravitational-wave-induced (black hole)-recoil events. Given the presence of multiple nuclei located (in projection) within the core radius of this galaxy, we explored and found support for the alternative "stalled infalling perturber" core-formation scenario, in which this galaxy's core could have been excavated by the action of an infalling massive perturber.
description: Published in: ApJ, 829, 81B, 2016
SAP Enterprise Resource Planning Central Component
Creators: Arbejdsmarkedets tillægspension (ATP)
Lønmodtagernes Garantifond (LG)
Arbejdsmarkedets Erhvervssygdomssikring (AES)
FerieKonto (FK)
Arbejdsgivernes Uddannelselsbidrag (AUB)
Skolepraktik
Tilskud fra staten til skolernes praktikpladsopsøgende arbejde
Arbejdsmiljøafgift
Lønmodtagernes Dyrtidsfond (LD)
Finansieringsbidrag (FIB)
Barsel.dk
Skattefradrag for seniorer
Den Særlige Pensionsopsparing (SP)
ATP PensionsService A/S
ATP ErhvervsService A/S
ATP Alpha Fondsmæglerselskab A/S
ATP Private Equity Partners I (ATP PEP I)
ATP Private Equity Partners II (ATP PEP II)
Publisher: name: Rigsarkivet
Year: 2023

description: At sikre alle krav fsa. bogføring og økonomistyring i bogføringsloven, årsregnskabsloven og lov om finansiel virksomhed er overholdt
Reducing Phytophthora risk in nurseries-Key considerations-US English
Creators: name: Green, Sarah
Publisher: name: Zenodo
Year: 2023
Subjects: Euphresco, plant health, surveillance, risk, management, nurseries, Phytophthora

description: Leaflet in US English. Best practice guidance developed in the framework of the Euphresco Project Early detection of Phytophthora in EU and third country nurseries and traded plants (ID-PHYT). The document highlights the key plant biosecurity considerations for growers and focuses on the need to understand high risk hosts and pathways, improved water management and plant growing conditions, awareness of symptoms and the importance of having staff trained in plant health.
SAP Enterprise Resource Planning Central Component
Creators: Arbejdsmarkedets tillægspension (ATP)
Lønmodtagernes Garantifond (LG)
Arbejdsmarkedets Erhvervssygdomssikring (AES)
FerieKonto (FK)
Arbejdsgivernes Uddannelselsbidrag (AUB)
Skolepraktik - elever
Tilskud fra staten til skolernes praktikpladsopsøgende arbejde
Lønmodtagernes Dyrtidsfond (LD)
Finansieringsbidrag (FIB)
Barsel.dk
Den Særlige Pensionsopsparing (SP)
ATP PensionsService A/S
ATP Alpha Fondsmæglerselskab A/S
ATP Private Equity Partners I (ATP PEP I)
ATP Private Equity Partners II (ATP PEP II)
Skattefradrag for seniorer
Publisher: name: Rigsarkivet
Year: 2023

description: At sikre alle krav fsa. bogføring og økonomistyring i bogføringsloven, årsregnskabsloven og lov om finansiel virksomhed er overholdt
Swimming at small Reynolds number of a planar assembly of spheres in an incompressible viscous fluid with inertia
Creators: name: Felderhof, B. U.
Publisher: name: arXiv
Year: 2016
Subjects: subject: Fluid Dynamics (physics.flu-dyn)
subject: FOS: Physical sciences

description: Translational and rotational swimming at small Reynolds number of a planar assembly of identical spheres immersed in an incompressible viscous fluid is studied on the basis of a set of equations of motion for the individual spheres. The motion of the spheres is caused by actuating forces and forces derived from a direct interaction potential, as well as hydrodynamic forces exerted by the fluid as frictional and added mass hydrodynamic interactions. The translational and rotational swimming velocities of the assembly are deduced from momentum and angular momentum balance equations. The mean power required during a period is calculated from an instantaneous power equation. Expressions are derived for the mean swimming velocities and the power, valid to second order in the amplitude of displacements from the relative equilibrium positions. Hence these quantities can be evaluated for prescribed periodic displacements. Explicit calculations are performed for three spheres interacting such that they form an equilateral triangle in the rest configuration.
description: 20 pages, 4 figures. arXiv admin note: text overlap with arXiv:1610.06029
Human Resource Development Practices in the Public Sector of Konso Locality
Creators: name: Kussia, Amanuel
Publisher: name: African Journal of Leadership and Development
Year: 2019

description: This study examines the practices of human resource development (mainly training and development) programs in some selected public institutions of Konso district. The study employs a descriptive survey research design with a mixed approach. For the purpose of collecting primary data, a structured questionnaire with a five point Liker Scale was prepared and administered to 201 respondents drawn from sixteen public institutions. Moreover, interview was held with six key informants. Descriptive statistics such as frequency counts, percentages, mean, and tables as well as content analysis were used to present and analyze data. The findings indicated that the practices of training and development in the public institutions of the district are extremely poor. Consequently, in the majority of public organizations training and development is found to be ineffective in improving knowledge, skills, and attitudes of the employees as well as individuals and organizational performance. It is, therefore, suggested that public managers should strengthen the systems and practices of training and development, establish accountable and systematized approach to effectively manage training and development initiatives, and strengthen follow up, monitoring and evaluation mechanisms.
description: African Journal of Leadership and Development, Vol. 4 No. 1 (2019): Work Environment, Service Delivery and Organizational Connectivity
Shubnikov-de Haas quantum oscilations reveal a reconstructed Fermi surface near optimal doping in a thin film of the cuprate superconductor Pr$_{1.86}$Ce$_{0.14}$CuO$_{4\pmδ}$
Creators: name: Breznay, Nicholas P.
name: Hayes, Ian M.
name: Ramshaw, B. J.
name: McDonald, Ross D.
name: Krockenberger, Yoshiharu
name: Ikeda, Ai
name: Irie, Hiroshi
name: Yamamoto, Hideki
name: Analytis, James G.
Publisher: name: arXiv
Year: 2016
Subjects: subject: Superconductivity (cond-mat.supr-con)
subject: FOS: Physical sciences

description: We study magnetotransport properties of the electron-doped superconductor Pr$_{2-x}$Ce$_x$CuO$_{4\pmδ}$ with $x$ = 0.14 in magnetic fields up to 92~T, and observe Shubnikov de-Haas magnetic quantum oscillations. The oscillations display a single frequency $F$=255$\pm$10~T, indicating a small Fermi pocket that is $\sim$~1\% of the two-dimensional Brillouin zone and consistent with a Fermi surface reconstructed from the large hole-like cylinder predicted for these layered materials. Despite the low nominal doping, all electronic properties including the effective mass and Hall effect are consistent with overdoped compounds. Our study demonstrates that the exceptional chemical control afforded by high quality thin films will enable Fermi surface studies deep into the overdoped cuprate phase diagram.
SAP Enterprise Resource Planning Central Component
Creators: Arbejdsmarkedets tillægspension (ATP)
Lønmodtagernes Garantifond (LG)
Arbejdsmarkedets Erhvervssygdomssikring (AES)
FerieKonto (FK)
Arbejdsgivernes Uddannelselsbidrag (AUB)
Skolepraktik - elever
Tilskud fra staten til skolernes praktikpladsopsøgende arbejde
Finansieringsbidrag (FIB)
Barsel.dk
Den Særlige Pensionsopsparing (SP)
ATP PensionsService A/S
ATP Alpha Fondsmæglerselskab A/S
ATP Private Equity Partners I (ATP PEP I)
ATP Private Equity Partners II (ATP PEP II)
Skattefradrag for seniorer
Udbetaling Danmark
Publisher: name: Rigsarkivet
Year: 2023

description: At sikre alle krav fsa. bogføring og økonomistyring i bogføringsloven, årsregnskabsloven og lov om finansiel virksomhed er overholdt