cometadata/datacite-rtg-text-other-reclassification-records huggingface dataset:
Gap statistics of two interacting run and tumble particles in one dimension
Creators: name: Das, Arghya
name: Dhar, Abhishek
name: Kundu, Anupam
Publisher: name: arXiv
Year: 2019
Subjects: subject: Statistical Mechanics (cond-mat.stat-mech)
subject: Soft Condensed Matter (cond-mat.soft)
subject: FOS: Physical sciences

description: We study the dynamics of the separation (gap) between a pair of interacting run and tumble particles (RTPs) moving in one dimension in the presence of additional thermal noise. On a ring geometry the distribution of the gap approaches a steady state. We analytically compute this distribution and find that this is exponentially localised in space, in contrast to the `jammed' configuration, seen earlier in the absence of thermal noise. We also study the relaxation which is an exponential, characterised by a time scale $τ_r$. We observe that this time scale undergoes a crossover from a size independent value to a size dependent form with increasing size $l$ of the ring. We study the full eigenvalue spectrum of the evolution operator $\mathcal{L}$ and find that the spectrum can be classified into four sectors depending on the symmetries of $\mathcal{L}$. For large $l$, we find explicit expressions for the low lying eigenvalues in each of the sectors. On infinite line the separation does not reach a steady state. In the long times we find that the particles behave as interacting Brownian particles, except for the presence of a peak in the distribution at small separation which is a remnant of activity.
description: 29 pages, 9 figures
Reconstructing veriT Proofs in Isabelle/HOL
Creators: name: Fleury, Mathias
name: Schurr, Hans-Jörg
Publisher: name: arXiv
Year: 2019
Subjects: subject: Logic in Computer Science (cs.LO)
subject: FOS: Computer and information sciences

description: Automated theorem provers are now commonly used within interactive theorem provers to discharge an increasingly large number of proof obligations. To maintain the trustworthiness of a proof, the automatically found proof must be verified inside the proof assistant. We present here a reconstruction procedure in the proof assistant Isabelle/HOL for proofs generated by the satisfiability modulo theories solver veriT which is part of the smt tactic. We describe in detail the architecture of our improved reconstruction method and the challenges we faced in designing it. Our experiments show that the veriT-powered smt tactic is regularly suggested by Sledgehammer as the fastest method to automatically solve proof goals.
description: In Proceedings PxTP 2019, arXiv:1908.08639
Average-case matrix discrepancy: satisfiability bounds
Creators: name: Maillard, Antoine
Publisher: name: ETH Zurich
Year: 2024
Subjects: Probability (math.PR)
Disordered Systems and Neural Networks (cond-mat.dis-nn)
Discrete Mathematics (cs.DM)
Combinatorics (math.CO)
FOS: Mathematics
FOS: Physical sciences
FOS: Computer and information sciences

description: Given a sequence of $d \times d$ symmetric matrices $\{\mathbf{W}_i\}_{i=1}^n$, and a margin $Δ> 0$, we investigate whether it is possible to find signs $(ε_1, \dots, ε_n) \in \{\pm 1\}^n$ such that the operator norm of the signed sum satisfies $\|\sum_{i=1}^n ε_i \mathbf{W}_i\|_\mathrm{op} \leq Δ$. Kunisky and Zhang (2023) recently introduced a random version of this problem, where the matrices $\{\mathbf{W}_i\}_{i=1}^n$ are drawn from the Gaussian orthogonal ensemble. This model can be seen as a random variant of the celebrated Matrix Spencer conjecture and as a matrix-valued analog of the symmetric binary perceptron in statistical physics. In this work, we establish a satisfiability transition in this problem as $n, d \to \infty$ with $n / d^2 \to τ> 0$. Our contributions are twofold. First, we prove that the expected number of solutions with margin $Δ=κ\sqrt{n}$ has a sharp threshold at a critical $τ_1(κ)$: for $τ< τ_1(κ)$ the problem is typically unsatisfiable, while for $τ> τ_1(κ)$ the average number of solutions becomes exponentially large. Second, combining a second-moment method with recent results from Altschuler (2023) on margin concentration in perceptron-type problems, we identify a second threshold $τ_2(κ)$, such that for $τ>τ_2(κ)$ the problem admits solutions with high probability. In particular, we establish for the first time that a system of $n = Θ(d^2)$ Gaussian random matrices can be balanced so that the spectrum of the resulting matrix macroscopically shrinks compared to the typical semicircle law. Our proofs rely on deriving concentration inequalities and large deviation properties for the law of correlated Gaussian matrices under spectral norm constraints, extending results in the literature and offering insights of independent interest.
description: arXiv
CLS-SMT: Bringing Together Combinatory Logic Synthesis and Satisfiability Modulo Theories
Creators: name: Kallat, Fadil
name: Schäfer, Tristan
name: Vasileva, Anna
Publisher: name: arXiv
Year: 2019
Subjects: subject: Logic in Computer Science (cs.LO)
subject: Formal Languages and Automata Theory (cs.FL)
subject: FOS: Computer and information sciences

description: We introduce an approach that aims to combine the usage of satisfiability modulo theories (SMT) solvers with the Combinatory Logic Synthesizer (CL)S framework. (CL)S is a tool for the automatic composition of software components from a user-specified repository. The framework yields a tree grammar that contains all composed terms that comply with a target type. Type specifications for (CL)S are based on combinatory logic with intersection types. Our approach translates the tree grammar into SMT functions, which allows the consideration of additional domain-specific constraints. We demonstrate the usefulness of our approach in several experiments.
description: In Proceedings PxTP 2019, arXiv:1908.08639
Makalah Individu UAS Entrepreneur Hafiz Akbar Widjayadi (11823001) "Etika Berwirausaha dalam Islam"
Creators: name: Widjayadi, Hafiz Akbar
Publisher: name: Zenodo
Year: 2022
Subjects: Etika, Wirausaha, Islam

description: Makalah ini dibuat untuk memenuhi tugas akhir individu pada mata kuliah Entrepreneurship.
Enhancing quality of dairy cattle research through adequate power analysis
Creators: name: Wang, Kai
name: Arshad, Usman
name: Niu, Mutian
Publisher: name: ETH Zurich
Year: 2024
Subjects: Dairy science
Experimental designs
Power analysis
Sample size
pwr4exp

description: Animal scientists use controlled experiments to test hypotheses and evaluate treatment effects within populations. Due to the impracticality of studying entire populations, representative samples are necessary. Assessing statistical power is a crucial step in designing robust experiments. However, many published articles in dairy science lack adequate power analysis, raising concerns about the applicability of findings. An analysis of trends from 1995 to 2023 based on publications in the "Production: Animal Nutrition" section of the Journal of Dairy Science reveals that only 4.73% of 4,376 articles reported power analysis. Additionally, 59% of papers that conducted power analysis did not report the tools used. With the large variability among the tools being used, and the predominant tool, SAS, being non-open access, there is a need to standardize power analysis and sample size calculation with an open-source tool. To address this gap, we developed the pwr4exp R package, an open-source tool that provides comprehensive model-oriented power analysis tailored for dairy science research. This review discusses key experimental designs for performing power analysis and sample size calculation using the pwr4exp R package. Developed based on linear mixed model inference, pwr4exp was validated by comparing with SAS procedures for completely randomized, randomized complete block, Latin Square, split-plot, or split-split-plot designs. It emphasizes the importance of model specification for downstream statistical analysis at the design and planning phase of an experiment and allows for precise power calculations for main effects, interactions, and contrasts in animal studies. Despite its advantages, pwr4exp in the current version has its limitations, such as the inability to analyze non-normal response variables or specify the correlation structures of repeated measures. This paper reviews the theoretical foundation behind model-oriented power analysis and provides practical guidelines for standardizing power analysis and sample size calculations in R, with examples of various experimental designs relevant in animal research.
description: agriRxiv
Birth of de Sitter Universe from time crystal
Creators: name: Yoshida, Daisuke
name: Soda, Jiro
Publisher: name: arXiv
Year: 2019
Subjects: subject: High Energy Physics - Theory (hep-th)
subject: Cosmology and Nongalactic Astrophysics (astro-ph.CO)
subject: General Relativity and Quantum Cosmology (gr-qc)
subject: FOS: Physical sciences

description: We show that a simple sub-class of Horndeski theory can describe a time crystal Universe. The time crystal Universe can be regarded as a baby Universe nucleated from a flat space, which is mediated by an extension of Giddings-Strominger instanton in a 2-form theory dual to the Horndeski theory. Remarkably, when a cosmological constant is included, de Sitter Universe can be created by tunneling from the time crystal Universe. It gives rise to a past completion of an inflationary Universe.
description: 13 pages, 14 figures
Gauge-Higgs Unification in Orbifold Models
Creators: name: Scrucca, C. A.
name: Serone, M.
name: Silvestrini, L.
name: Wulzer, A.
Publisher: name: arXiv
Year: 2003
Subjects: subject: High Energy Physics - Theory (hep-th)
subject: High Energy Physics - Phenomenology (hep-ph)
subject: FOS: Physical sciences

description: Six-dimensional orbifold models where the Higgs field is identified with some internal component of a gauge field are considered. We classify all possible T^2/Z_N orbifold constructions based on a SU(3) electroweak gauge symmetry. Depending on the orbifold twist, models with two, one or zero Higgs doublets can be obtained. Models with one Higgs doublet are particularly interesting because they lead to a prediction for the Higgs mass, which is twice the W boson mass at leading order: m_H=2 m_W. The electroweak scale is quadratically sensitive to the cut-off, but only through very specific localized operators. We study in detail the structure of these operators at one loop, and identify a class of models where they do not destabilize the electroweak scale at the leading order. This provides a very promising framework to construct realistic and predictive models of electroweak symmetry breaking.
description: 27 pages, uses axodraw.sty; v2: version to appear in JHEP
Veenidea kunradensis Deroo 1966
Creators: name: Guernet, Claude
name: Villier, Loïc
Publisher: name: Zenodo
Year: 2017
Subjects: Biodiversity
Taxonomy
Animalia
Arthropoda
Ostracoda
Podocopida
Cytherideidae
Veenidea
Veenidea kunradensis

description: Veenidea kunradensis Deroo, 1966
(Fig. 3H)
 Veenidea kunradensis Deroo, 1966: 93, pl. 1, figs 3-6, pl. 11, figs 214-218.
 Veenidea aff. kunradensis – Margerie 1968: 9, pl. 4, fig. 5, pl. 7, fig. 6, cellule MA 27a.
REMARQUES
P. Margerie n’a recueilli que deux valves de cette espèce dont une seule est présumée adulte. Selon lui, les stries signalées par G. Deroo « ne sont pas nettement visibles » sur ses valves mais G. Deroo ne note lui-même sur les siennes que « trois faibles stries, courtes, parallèles au bord antérieur » qui, d’ailleurs, ne sont pas distinctes sur ces propres figurations. Les valves du Maastrichtien supérieur du Limbourg et celles du Mont Aimé sont donc considérées ici comme conspécifiques.
description: Published as part of Guernet, Claude & Villier, Loïc, 2017, Les ostracodes de la collection de P. Margerie et l'âge des couches à Laffittéines du Mont Aimé (bassin de Paris, France), pp. 225-249 in Geodiversitas 39 (2) on page 235, DOI: 10.5252/g2017n2a4, http://zenodo.org/record/5206009
Turbulent transport and mixing in the multimode narrowband Richtmyer-Meshkov instability
Creators: name: Thornber, B.
name: Griffond, J.
name: Bigdelou, P.
name: Boureima, I.
name: Ramaprabhu, P.
name: Schilling, O.
name: Williams, R. J. R.
Publisher: name: arXiv
Year: 2019
Subjects: subject: Fluid Dynamics (physics.flu-dyn)
subject: FOS: Physical sciences

description: The mean momentum and heavy mass fraction, turbulent kinetic energy, and heavy mass fraction variance fields, as well as the budgets of their transport equations, are examined at several times during the evolution of a narrowband Richtmyer-Meshkov instability initiated by a Mach 1.84 shock traversing a perturbed interface separating gases with a density ratio of 3. The results are computed using the `quarter scale' data from four algorithms presented in the θ-group study of Thornber et al. [Phys. Fluids 29, 105107 (2017)]. The present study is inspired by a previous similar study of Rayleigh-Taylor instability and mixing using direct numerical simulation data by Schilling and Mueschke [Phys. Fluids 22, 105102 (2010)]. In addition to comparing the predictions of the data from four implicit large-eddy simulation codes, the budgets are used to quantify the relative importance of the terms in the transport equations, and the balance of the terms is employed to infer the numerical dissipation. Terms arising from the compressibility of the flow are examined in particular, i.e., the pressure-dilatation. The results are useful for validation of large-eddy simulation and Reynolds-averaged modeling of Richtmyer-Meshkov instability.
description: This article may be downloaded for personal use only. Any other use requires prior permission of the author and AIP Publishing. This article appeared in Physics of Fluids 31, 096105 (2019) and may be found at https://aip.scitation.org/doi/abs/10.1063/1.5111681
Aysegulina semicancellata Guernet & Villier 2017, n. comb.
Creators: name: Guernet, Claude
name: Villier, Loïc
Publisher: name: Zenodo
Year: 2017
Subjects: Biodiversity
Taxonomy
Animalia
Arthropoda
Ostracoda
Podocopida
Hemicytheridae
Aysegulina
Aysegulina semicancellata

description: Aysegulina semicancellata (Bosquet, 1854), n. comb.
 Cythere semicancellata Bosquet, 1854: 112, pl. 7, fig. 9.
 Limburgina semicancellata – Deroo 1966: 158, pl. 24, figs 751-753.
 Limburgina cf. semicancellata – Margerie 1968: 21, pl. 5, fig. 28, cellule MA 53.
REMARQUES
 A. semicancellata, n. comb. est connue dans le Maastrichtien supérieur du Limbourg (Deroo 1966). P. Margerie n’en a recueilli qu’une valve gauche.
description: Published as part of Guernet, Claude & Villier, Loïc, 2017, Les ostracodes de la collection de P. Margerie et l'âge des couches à Laffittéines du Mont Aimé (bassin de Paris, France), pp. 225-249 in Geodiversitas 39 (2) on page 241, DOI: 10.5252/g2017n2a4, http://zenodo.org/record/5206009
Decadal Climate Variability: Economic Implications In Agriculture And Water In The Missouri River Basin
Creators: name: Fernandez, Mario Andres
name: Fernandez, Mario Andres
Publisher: name: Unknown
Year: 2013
Subjects: subject: Agribusiness
subject: Community/Rural/Urban Development
subject: Crop Production/Industries
subject: Demand and Price Analysis
subject: Environmental Economics and Policy
subject: Farm Management
subject: Land Economics/Use
subject: Decadal climate variability
subject: value of information
subject: adaptation
subject: crop insurance

description: Economic research on decadal climate variability (DCV) is scarce. DCV refers to ocean-related climate influences of duration from seven to twenty years. The DCV phenomena and their phases are associated with variations in crop and water yields. This paper examines the value of DCV information in the Missouri river basin using a mathematical programming model. The analysis shows the value of a perfect forecast is about 5.2 billion dollars, though 86% of this value can be obtained by a less perfect forecast based on already available data. Results show differential responses in major crops acreage and water usage.
Beyond the Tanker Track: the social influence of dairying in Southland, 1992 to 2012
Creators: name: Greenhalgh, Jill
name: Rawlinson, Phillipa
name: Greenhalgh, Jill
name: Rawlinson, Phillipa
Publisher: name: Unknown
Year: 2013
Subjects: subject: Agricultural and Food Policy
subject: Demand and Price Analysis
subject: Environmental Economics and Policy
subject: Farm Management
subject: Labor and Human Capital
subject: Land Economics/Use
subject: Southland
subject: dairy farming
subject: social influences
subject: diversification
subject: employment

description: The aim of this study was to investigate the social influence that the recent growth of dairying has had in Southland. Over 60 semi-structured and informal interviews were undertaken with a wide cross-section of organisations and individuals. Quantitative data was used to complement the qualitative data. The growth of dairying has provided sheep farmers with more farming options through dairy support and increasing their equity. It has created downstream employment for dairy services and suppliers and, consequently, more employment opportunities. Rural communities are being revitalised through the influx of younger people. Primary schools are more multicultural and their roll decline has been arrested, but the transience associated with dairying creates problems. Community relationships have been affected by the different values of dairy farmers. Their occupational demands also affect their ability to participate in community activities. Southlanders perceive that dairying does impact on the environment with iwi recognising a loss of some traditional food sources. However, most participants believe environmentally-related compliance is improving. The overall finding is that dairying has revitalised an ailing Southland economy by creating a wider range of employment opportunities, drawing in a more youthful population, and generating a more diversified economic base.
Consumers behaviours when confronted with GMOs in food: lessons drawn from experimental economy
Creators: name: Ruffieux, Bernard
name: Ruffieux, Bernard
Publisher: name: Unknown
Year: 2005
Subjects: Agricultural and Food Policy
Research and Development/Tech Change/Emerging Technologies

description: The introduction of genetically modified organisms (GMOs) in human and animal food has given rise to a fascinating debate in Europe. Yet, in France and in the European Union, introducing GMOs in food cannot be done without prior permission. This permission can only be granted after a complete scientific procedure of risk assessment for health and environment has been carried out. In spite of these precautions, French/European public opinion remains predominantly quite hostile: our own investigations show that 89% of French opinion is opposed to the presence of GMOs in their food and 79% think GMOs should be purely and simply forbidden. A recent European Union regulation (180/2003) has given a framework for the traceability and labelling of GMOs. This regulation ensures complete and reliable information to consumers, letting them choose with full knowledge of the facts. In practical terms, the EU has decided to impose the note “contains GMOs” on transgenic products. To be exempt from the label there must not be more than a 0,9% trace of GMOs in the ingredients of the product, introduced in an accidental or technically unavoidable way. Are these measures likely to convince consumers to accept GMOs?
Binary black holes in circular orbits. II. Numerical methods and first results
Creators: name: Grandclément, Philippe
name: Gourgoulhon, Eric
name: Bonazzola, Silvano
Publisher: name: arXiv
Year: 2001
Subjects: subject: General Relativity and Quantum Cosmology (gr-qc)
subject: Astrophysics (astro-ph)
subject: FOS: Physical sciences

description: We present the first results from a new method for computing spacetimes representing corotating binary black holes in circular orbits. The method is based on the assumption of exact equilibrium. It uses the standard 3+1 decomposition of Einstein equations and conformal flatness approximation for the 3-metric. Contrary to previous numerical approaches to this problem, we do not solve only the constraint equations but rather a set of five equations for the lapse function, the conformal factor and the shift vector. The orbital velocity is unambiguously determined by imposing that, at infinity, the metric behaves like the Schwarzschild one, a requirement which is equivalent to the virial theorem. The numerical scheme has been implemented using multi-domain spectral methods and passed numerous tests. A sequence of corotating black holes of equal mass is calculated. Defining the sequence by requiring that the ADM mass decrease is equal to the angular momentum decrease multiplied by the orbital angular velocity, it is found that the area of the apparent horizons is constant along the sequence. We also find a turning point in the ADM mass and angular momentum curves, which may be interpreted as an innermost stable circular orbit (ISCO). The values of the global quantities at the ISCO, especially the orbital velocity, are in much better agreement with those from third post-Newtonian calculations than with those resulting from previous numerical approaches.
description: 27 pages, 20 PostScript figures, improved presentation of the regularization procedure for the shift vector, new section devoted to the check of the momentum constraint, references added + minor corrections, accepted for publication in Phys. Rev. D
Factors that Affect Seasonality in Kentucky Feeder Calf Prices and How Calving Dates Affect Cow-Calf Enterprise Profitability
Creators: name: Hardin, Dan
name: Saghaian, Sayed
name: Hardin, Dan
name: Saghaian, Sayed
Publisher: name: Unknown
Year: 2014
Subjects: subject: Agribusiness
subject: Livestock Production/Industries
subject: Seasonality
subject: Cow Calf
subject: Cattle Prices
subject: Profitablility

description: This study uses an empirical analysis and a budget analysis to study seasonality in calf prices and cow-calf operator incomes. Calf prices were found to be highest in the summer and lowest in the fall while profits for cow-calf operators were found to be highest for spring calving cow herds.
Hybrid modes in Al nanoparticles arrays
Creators: name: Ershov, Alexander E.
name: Gerasimov, Valeriy S.
name: Bikbaev, Rashid G.
name: Polyutov, Sergey P.
name: Karpov, Sergey V.
Publisher: name: arXiv
Year: 2019
Subjects: subject: Optics (physics.optics)
subject: FOS: Physical sciences

description: The mechanisms of coupling between the lattice modes of a two-dimensional (2D) array consisting of Al nanoparticles and the localized modes of individual Al nanoparticles have been studied in detail. The results have been obtained employing the finite-difference time-domain method (FDTD) and the generalized Mie theory. It was shown that interactions of single particles with 2D lattice modes significantly change the extinction spectra depending on the particle radius and the lattice period. The Rayleigh anomalies of higher orders contribute to formation of hybrid modes resulting in increase of the extinction efficiency in short wavelength range of the spectrum. It is shown that high intensity magnetic modes are excited in aluminum nanoparticles arrays. The patterns of spatial electromagnetic field distribution at the frequencies of hybrid modes have been studied. We note that comprehensive understanding the mode coupling mechanisms in arrays paves the way for engineering different types of modern photonic devices with controllable optical properties.
description: 11 pages, 7 figures
Willingness to Pay for Safer Dairy Product in China: Evidence from Shanghai Customers' Purchasing Decision of Bright Dairy's Baby Cheese
Creators: name: Yan, Yiwei
name: Ames, Glenn C.W.
name: Colson, Gregory
name: Chen, Tinggui
name: Yan, Yiwei
name: Ames, Glenn C.W.
name: Colson, Gregory
name: Chen, Tinggui
Publisher: name: Unknown
Year: 2014
Subjects: subject: Agribusiness
subject: Food Consumption/Nutrition/Food Safety
subject: Food Safety
subject: Willingness to Pay
subject: Interval Regression
subject: Cheese

description: This study analyzes Shanghai customers’ willingness to pay for safer Baby Cheese following a series of food safety incidents by a major Chinese manufacturer. Results from interval regressions of consumer survey responses indicate that consumers are willing to pay a premium of 36.80% for safer Baby Cheese.
The Impact of Marketing Channels Used by U.S. Meat Goat Producers on Farm Profitability
Creators: name: Gillespie, Jeffrey
name: Nyaupane, Narayan
name: McMillin, Kenneth
name: Harrison, Wes
name: Gillespie, Jeffrey
name: Nyaupane, Narayan
name: McMillin, Kenneth
name: Harrison, Wes
Publisher: name: Unknown
Year: 2014
Subjects: subject: Farm Management
subject: Livestock Production/Industries
subject: Marketing
subject: FOS: Economics and business
subject: marketing channels
subject: meat goat
subject: probit
subject: profitability

description: This study investigates factors influencing the use of marketing channels in U.S. meat goat production. Producer demographics, production system, socioeconomic, and regional variables impacted marketing channel selection. Larger-scale producers selling goat meat or selling larger percentages of goats as slaughter or as meat were more profitable.
VCF SNP markers_66750
Creators: name: Lozada, Dennis Nicuh
Publisher: name: figshare
Year: 2021
Subjects: subject: 70602 Horticultural Crop Improvement (Selection and Breeding)
subject: FOS: Agriculture, forestry and fisheries

description: Variant call format (VCF) file for the 66,750 SNP markers
Aysegulina Ozdikmen 2010
Creators: name: Guernet, Claude
name: Villier, Loïc
Publisher: name: Zenodo
Year: 2017
Subjects: Biodiversity
Taxonomy
Animalia
Arthropoda
Ostracoda
Podocopida
Hemicytheridae
Aysegulina

description: Aysegulina ? sp. D
 Limburgina ? sp. D – Margerie 1968: 24, pl. 6, fig. 7, cellule MA 60.
REMARQUES
 Cette espèce n’est représentée que par une valve gauche caractérisée notamment par ses pores conulis. Elle est rapprochée par P. Margerie de L. castanea Deroo, 1966, montienne et de Echinocythereis ? variolata (Bosquet, 1854) du Maastrichtien. En réalité, elle semble proche, comme la précédente, de A. ornata (Bosquet, 1847).
description: Published as part of Guernet, Claude & Villier, Loïc, 2017, Les ostracodes de la collection de P. Margerie et l'âge des couches à Laffittéines du Mont Aimé (bassin de Paris, France), pp. 225-249 in Geodiversitas 39 (2) on page 242, DOI: 10.5252/g2017n2a4, http://zenodo.org/record/5206009
Scaling and universality in turbulent convection
Creators: name: Celani, Antonio
name: Matsumoto, Takeshi
name: Mazzino, Andrea
name: Vergassola, Massimo
Publisher: name: arXiv
Year: 2001
Subjects: subject: Chaotic Dynamics (nlin.CD)
subject: FOS: Physical sciences

description: Anomalous correlation functions of the temperature field in two-dimensional turbulent convection are shown to be universal with respect to the choice of external sources. Moreover, they are equal to the anomalous correlations of the concentration field of a passive tracer advected by the convective flow itself. The statistics of velocity differences is found to be universal, self-similar and close to Gaussian. These results point to the conclusion that temperature intermittency in two-dimensional turbulent convection may be traced back to the existence of statistically preserved structures, as it is in passive scalar turbulence.
description: 4 pages, 6 figures
Determinants of Rice Productivity and Technical Efficiency in the Philippines
Creators: name: Koirala, Krishna H.
name: Mishra, Ashok K.
name: Mohanty, Samarendu
name: Koirala, Krishna H.
name: Mishra, Ashok K.
name: Mohanty, Samarendu
Publisher: name: Unknown
Year: 2014
Subjects: subject: Crop Production/Industries
subject: Production Economics
subject: Food security
subject: technical efficiency
subject: Stochastic Frontier Production
subject: Philippines
subject: Production

description: Agricultural production determines the efficiency level of households in their farming activities. In the developing countries farmers do not use all potential technological resources, thus making inefficient decisions in their agricultural activities. So, this paper focuses to measure the technical efficiency of rice production and identified determinants of technical efficiency of rice farmers in Philippines. The Loop Survey of the Institute of Rice Research Institute (2007-2012) was analyzed using stochastic frontier production method in the Cobb-Douglas functional form. Result shows that fuel, fertilizer, land rent, planting season, and land area are the factors that affect both production and technical efficiency of rice production. We found mean technical efficiency score of 0.54.
Embedding of the Brane into Six Dimensions
Creators: name: Gogberashvili, M.
Publisher: name: arXiv
Year: 2002
Subjects: subject: General Relativity and Quantum Cosmology (gr-qc)
subject: Astrophysics (astro-ph)
subject: High Energy Physics - Phenomenology (hep-ph)
subject: High Energy Physics - Theory (hep-th)
subject: FOS: Physical sciences

description: Embedding of the brane metric into Euclidean (2+4)-space is found. Brane geometry can be visualized as the surface of the hyper-sphere in six dimensions which 'radius' is governed by the cosmological constant. Minkowski space in this picture is lied on the intersection of this surface with the plane formed by the extra space-like and time-like coordinates.
description: 3 pages, LaTeX, no figures, one citation was eddied
title: Préface_Manuel de l'amateur de reliures armoriées françaises . Sixième série
Creators: name: AmateurS
Publisher: name: NAKALA - https://nakala.fr (Huma-Num - CNRS)
publisherIdentifier: https://ror.org/04ces3204
publisherIdentifierScheme: ROR
Year: 2021

description: Préface
description: ID_PARA_00971
Quark Coalescence for Charmed Mesons in Ultrarelativistic Heavy-Ion Collisions
Creators: name: Greco, V.
name: Ko, C. M.
name: Rapp, R.
Publisher: name: arXiv
Year: 2003
Subjects: subject: Nuclear Theory (nucl-th)
subject: FOS: Physical sciences

description: We investigate effects of charm-quark interactions in a Quark-Gluon Plasma on the production of $D$ and $J/ψ$ mesons in high-energy heavy-ion collisions. Employing a previously constructed coalescence model that successfully reproduces the transverse momentum ($p_T$) spectra and elliptic flow ($v_2(p_T)$) of light hadrons at RHIC from underlying light-quark distributions at the phase transition temperature $T_c$, $D$-meson and $J/ψ$ $p_T$ spectra are evaluated. For the charm-quark distributions, we consider two limiting scenarios: (i) {\em no} rescattering, corresponding to perturbative QCD spectra and (ii) {\em complete} thermalization including transverse expansion. With the $D$-meson spectra acquiring a minimal $v_2$ inherited from their light-quark content, the corresponding semileptonic decay spectra of single electrons are found to practically preserve the $v_2$ of the parent particles, exhibiting marked differences between the pQCD and thermal scenarios for $p_T\ge 1$ GeV. Likewise, the $p_T$-spectra and yields of $J/ψ$'s differ appreciably in the two scenarios.
description: 6 pages, 4 figures, version published in PLB with updated figures
Xestoleberis pergensi Van Veen 1936
Creators: name: Guernet, Claude
name: Villier, Loïc
Publisher: name: Zenodo
Year: 2017
Subjects: Biodiversity
Taxonomy
Animalia
Arthropoda
Ostracoda
Podocopida
Xestoleberididae
Xestoleberis
Xestoleberis pergensi

description: Xestoleberis pergensi Van Veen, 1936
 Xestoleberis pergensi Van Veen, 1936: 17, pl. 3, figs 12-19. — Howe & Laurencich 1958: 517, 518. — Szczechura 1965: 502, 503, pl. 4, figs 4, 5, pl. 8, figs 11-15. — Herrig 1966: 940, 941, pl. 41, figs 10-11. — Deroo 1966: 171, pl. 27, figs 865-870. — Margerie 1968: 29, pl. 6, fig. 20, cellule MA 69.
REMARQUES
Cette espèce décrite dans le Maastrichtien supérieur de Belgique et des Pays-Bas est représentée par quatre carapaces et une valve droite dans la collection de P. Margerie. Selon J. Szczechura (1965), elle est présente en Pologne du Campanien au Maastrichtien, voire au Paléocène (où un seul spécimen a été recueilli).
description: Published as part of Guernet, Claude & Villier, Loïc, 2017, Les ostracodes de la collection de P. Margerie et l'âge des couches à Laffittéines du Mont Aimé (bassin de Paris, France), pp. 225-249 in Geodiversitas 39 (2) on page 244, DOI: 10.5252/g2017n2a4, http://zenodo.org/record/5206009
Phase diagram and phonon-induced backscattering in topological insulator nanowires
Creators: name: Dorn, Kathrin
name: De Martino, Alessandro
name: Egger, Reinhold
Publisher: name: arXiv
Year: 2019
Subjects: subject: Mesoscale and Nanoscale Physics (cond-mat.mes-hall)
subject: Strongly Correlated Electrons (cond-mat.str-el)
subject: FOS: Physical sciences

description: We present an effective low-energy theory of electron-phonon coupling effects for clean cylindrical topological insulator nanowires. Acoustic phonons are modelled by isotropic elastic continuum theory with stress-free boundary conditions. We take into account the deformation potential coupling between phonons and helical surface Dirac fermions, and also include electron-electron interactions within the bosonization approach. For half-integer values of the magnetic flux $Φ_B$ along the wire, the low-energy theory admits an exact solution since a topological protection mechanism then rules out phonon-induced $2k_F$-backscattering processes. We determine the zero-temperature phase diagram and identify a regime dominated by superconducting pairing of surface states. As example, we consider the phase diagram of HgTe nanowires. We also determine the phonon-induced electrical resistivity, where we find a quadratic dependence on the flux deviation $δΦ_B$ from the nearest half-integer value.
description: 14 pages, 1 figure; published version
Introduction to the assessment of the statistical confidence of pine wood nematode surveys
Creators: name: Hannunen, Salla
name: Tuomola, Juha
name: Marinova-Todorova, Mariela
Publisher: name: Zenodo
Year: 2022
Subjects: subject: pine wood nematode
subject: Bursaphelenchus xylophilus
subject: quarantine pest
subject: plant health
subject: survey
subject: sensitivity
subject: probability of freedom
subject: Finland
subject: http://id.agrisemantics.org/gacs/C23605
subject: http://id.agrisemantics.org/gacs/C5759
subject: http://id.agrisemantics.org/gacs/C1072

description: These are the materials of the workshop “Introduction to the assessment of the statistical confidence of surveys” organized in the project “Assessing the confidence in pest freedom gained in the past pine wood nematode surveys” funded by the European Food Safety Authority (GP/EFSA/ENCO/2020/03 - Partnering grants). The aim of the project is to build capacity for assessing the probability of pest freedom gained in past pine wood nematode (Bursaphelenchus xylophilus) surveys. The project is a co-operation between the Finnish Food Authority, the Estonian Agriculture and Food Board, the Lithuanian State Plant Service under the Ministry of Agriculture, the Norwegian Scientific Committee for Food and Environment and the Swedish University of Agricultural Sciences.
description: FI; en; PDF; salla.hannunen@foodauthority.fi
Hydrodynamic characteristics of aquiferous modules in the demosponge Halichondria panicea
Creators: name: Kealy, Rachael A.
name: Busk, Thomas
name: Goldstein, Josephine
name: Larsen, Poul S.
name: Riisgård, Hans Ulrik
Publisher: name: Taylor & Francis
Year: 2019
Subjects: subject: Biophysics
subject: 29999 Physical Sciences not elsewhere classified
subject: FOS: Physical sciences
subject: Biotechnology
subject: Sociology
subject: FOS: Sociology
subject: Ecology
subject: FOS: Biological sciences
subject: 69999 Biological Sciences not elsewhere classified

description: Multi-oscula sponges are organisms composed of aquiferous modules, each of which draws water through its canal system by means of pumping units (choanocytes, Cs, in choanocyte chambers, CCs) such that the filtered water leaves the module as an exhalant jet through the osculum of the module. Here we compare relations between the characteristic parameters of sponge volume (V), osculum cross-sectional area (OSA), exhalant jet speed (U0), and filtration rate (F) of single-osculum explants and individual aquiferous modules of multi-oscula explants of the demosponge Halichondria panicea. The latter modules are identified by observing from which osculum the surface administered dye will emerge. There is fair agreement in results between the two types of modules. For both types, the filtration rate is a linear function of the modules’ volume, with average values of volume-specific filtration rate (FV) of 1.8 and 1.2 ml min−1 cm−3 for single- and multi-oscula sponge explants, respectively. This and data from the literature for 5 demosponges support the hypothesis that the density of pumping units are of the same order of magnitude for the present given species and for some other demosponges.
Climatic predictors of speleothem deposition in SW Asia
Creators: name: Nicholson, Samuel
name: Jacobson, Matthew
name: Markowska, Monika
name: Schroeder, Julian
name: Vonhof, Hubert
name: Haug, Gerald
Publisher: name: ETH Zurich
Year: 2024

description: Speleothems (stalagmites, stalactites and flowstones) are a powerful archive for reconstructing past climate conditions. These are secondary calcium-carbonate deposits that form in caves from the adequate supply of rainwater, soil CO2 and dissolved bicarbonate. They have been used extensively in arid regions, such as SW Asia, to reconstruct and benchmark past hydroclimatic conditions. Analysis of the distribution of active and inactive speleothem deposition across the Negev desert suggested a precipitation threshold of ~300-350 mm yr-1 is required for speleothems to deposit. This threshold has been applied to the broader SW Asia region to understand the minimum rainfall during periods of climate amelioration but has lacked specific region-wide analysis. Here, we apply logistic regression techniques and machine-learning methods to understand the climatic parameters which predict speleothem deposition across SW Asia. We show a gradual, rather than threshold response between speleothem deposition and rainfall amount, suggesting 1) precipitation over 300-350 mm yr is not a simple predictor of speleothem deposition across SW Asia, and 2) sites specific climates/environments and processes play an important role. We then apply a Random Forest machine-learning algorithm to our dataset to create a prediction of speleothem deposition. We show that minimum and maximum monthly rainfall, elevation, and a terrain roughness index are the most important variables, suggesting that water availability and topography are important predictors of speleothem deposition. Climate indices associated with temperature and evaporation contribute but play a less important role in the prediction. We emphasise the need for additional monitoring of external and internal cave environments to refine the climatic predictors of speleothem deposition in SW Asia and understand the site-specific processes that lead to the activation or cessation of speleothem growth. Importantly, our prediction provides a model which includes a range of climate-environmental data and may be used by researchers to locate new speleothem-bearing cave sites for study.
description: EGUsphere
title: Les corps-à-corps de la mondialisation : analyse anthropologique de la situation globale du hip-hop
title: The body check of globalization: An anthropological analysis of the global situation of hip-hop
Creators: name: Milliot, Virginie
name: Noûs, Camille
Publisher: name: ethnographiques.org
Year: 2020
Subjects: subject: mondialisation
subject: analyse comparative
subject: corps
subject: situation globale
subject: dynamique culturelle
subject: globalization
subject: comparative analysis
subject: body
subject: global situation
subject: cultural dynamics

description: Cet article propose une analyse anthropologique de la « situation globale » du hip-hop. Dans une première partie nous nous pencherons sur la manière dont ce mouvement a « émergé » en différents lieux. L'analyse comparée des premières heures du hip-hop nous permettra de saisir les premiers ressorts de son appropriation. Nous verrons que le corps a joué un rôle clef et que la forme a devancé les significations. L'analyse comparative d'ethnographies portant sur l'évolution du hip-hop dans différents pays nous permettra ensuite de saisir les modalités selon lesquelles il s'est localement chargé de sens. Nous verrons que ce mouvement a ouvert un espace dialectique de négociation identitaire en amenant les jeunes à se positionner dans un double mouvement : vis-à-vis des catégorisations actives dans l'esthétique hip-hop et de celles qui étaient pertinentes pour exprimer et adresser leurs propres expériences. Les significations plurielles de ce mouvement se sont ensuite progressivement cristallisées au fil de pratiques et d'interactions situées selon une dynamique que nous tenterons d'analyser en maintenant une exigence comparative. mots-clés : mondialisation, analyse comparative, corps, situation globale, dynamique culturelle
description: The body check of globalization : An anthropological analysis of the global situation of hip-hop This article offers an anthropological analysis of hip-hop's “global situation”. In the first part, we will look at how this movement “emerged” in different places. Comparative analysis of the development of hip-hop will allow us to grasp the modes of its initial appropriation : the body played a key role in this process, and form took precedence over meaning. In the second part of the article, a comparative analysis of ethnographies on the evolution of hip-hop in different countries will reveal how this art has become locally meaningful. We will show that this movement has opened up a dialectic space for the negotiation of identities, leading young people to position themselves in two distinct ways : vis-à-vis the categorizations present in the hip-hop aesthetic, on the one hand, and vis-à-vis those that allow them to express and address their own experiences, on the other. The plural meanings of this movement then gradually crystallized around situated practices and interactions, following a dynamic that we will attempt to analyze, once again in comparative perspective. keywords : globalization, comparative analysis, body, global situation, cultural dynamics
Stochastic dynamical modeling of turbulent flows
Creators: name: Zare, Armin
name: Georgiou, Tryphon T.
name: Jovanović, Mihailo R.
Publisher: name: arXiv
Year: 2019
Subjects: subject: Fluid Dynamics (physics.flu-dyn)
subject: Machine Learning (cs.LG)
subject: Systems and Control (eess.SY)
subject: Optimization and Control (math.OC)
subject: FOS: Physical sciences
subject: FOS: Computer and information sciences
subject: FOS: Electrical engineering, electronic engineering, information engineering
subject: FOS: Mathematics

description: Advanced measurement techniques and high performance computing have made large data sets available for a wide range of turbulent flows that arise in engineering applications. Drawing on this abundance of data, dynamical models can be constructed to reproduce structural and statistical features of turbulent flows, opening the way to the design of effective model-based flow control strategies. This review describes a framework for completing second-order statistics of turbulent flows by models that are based on the Navier-Stokes equations linearized around the turbulent mean velocity. Systems theory and convex optimization are combined to address the inherent uncertainty in the dynamics and the statistics of the flow by seeking a suitable parsimonious correction to the prior linearized model. Specifically, dynamical couplings between states of the linearized model dictate structural constraints on the statistics of flow fluctuations. Thence, colored-in-time stochastic forcing that drives the linearized model is sought to account for and reconcile dynamics with available data (i.e., partially known second order statistics). The number of dynamical degrees of freedom that are directly affected by stochastic excitation is minimized as a measure of model parsimony. The spectral content of the resulting colored-in-time stochastic contribution can alternatively be seen to arise from a low-rank structural perturbation of the linearized dynamical generator, pointing to suitable dynamical corrections that may account for the absence of the nonlinear interactions in the linearized model.
description: To appear in the Annual Review of Control, Robotics, and Autonomous Systems
On a new observable for measuring the Lense-Thirring effect with Satellite Laser Ranging
Creators: name: Iorio, Lorenzo
Publisher: name: arXiv
Year: 2002
Subjects: subject: General Relativity and Quantum Cosmology (gr-qc)
subject: Astrophysics (astro-ph)
subject: Space Physics (physics.space-ph)
subject: FOS: Physical sciences

description: In this paper we present a rather extensive error budget for the difference of the perigees of a pair of supplementary SLR satellites aimed to the detection of the Lense-Thirring effect.
description: LaTex2e, 14 pages, 1 table, no figures. Some changes and additions to the abstract, Introduction and Conclusions. References updated, typos corrected. Equation corrected. To appear in General Relativity and Gravitation
Millennial-scale changes in hydroclimate during the last glacial period in central Europe reconstructed from leaf wax δD
Creators: name: Zander, Paul
name: Sirocko, Frank
name: Du, Xiaojing
name: Sun, Chijun
name: Rubach, Florian
name: Britzius, Sarah
name: Haug, Gerald
name: Martínez-García, Alfredo
Publisher: name: ETH Zurich
Year: 2024

description: Millennial-scale climate events during the last glacial period, such as Dansgaard-Oeschger cycles and Heinrich events, are well-documented in ice cores and marine sediments. During Dansgaard-Oeschger cycles of the last glacial period, repeated rapid warming events of a similar magnitude to modern-day warming occurred over the North Atlantic region. However, the impacts of these fluctuations on hydroclimate in Europe remain poorly constrained, mainly due to a lack of high-resolution, well-dated paleoclimate records. Here, we use D/H ratios (δD) measured on n-alkanes derived from leaf waxes preserved in lacustrine sediments from Eifel maar crater basins to reconstruct changes in hydroclimate. Our record spans the past 60,000 years and is tied to the Greenland NGRIP ice core chronology using a high-resolution index of lake productivity. Initial results show that δDwax was more depleted during interstadial phases of the last glacial period. Multiple factors may influence δDwax; however, if an isotope “temperature effect” played a dominant role, the warmer interstadials would have been associated with more positive δDwax values, in contrast to the observations here.  Thus, we interpret low δD during interstadials as a signal of wetter, more humid conditions, possibly related to a shift towards more winter precipitation due to changes in the position of the westerlies. We compare our proxy measurements with an isotope-enabled transient climate simulation of the last deglaciation (iTRACE) to constrain the dynamical factors associated with changes in precipitation δD over stadial/interstadial changes. These results provide important constraints on past millennial-scale hydrological changes in Europe in response to changes in North Atlantic circulation.
description: EGUsphere