cometadata/datacite-rtg-text-other-reclassification-records huggingface dataset:
Finite group actions on Lagrangian Floer theory
Creators: name: Cho, Cheol-Hyun
name: Hong, Hansol
Publisher: name: arXiv
Year: 2013
Subjects: subject: Symplectic Geometry (math.SG)
subject: FOS: Mathematics
subject: 53D40

description: We construct finite group actions on Lagrangian Floer theory when symplectic manifolds have finite group actions and Lagrangian submanifolds have induced group actions. We first define finite group actions on Novikov-Morse theory. We introduce the notion of a {\em spin profile} as an obstruction class of extending the group action on Lagrangian submanifold to the one on its spin structure, which is a group cohomology class in $H^2(G;\Z/2)$. For a class of Lagrangian submanifolds which have the same spin profiles, we define a finite group action on their Fukaya category. In consequence, we obtain the $s$-equivariant Fukaya category as well as the $s$-orbifolded Fukaya category for each group cohomology class $s$. We also develop a version with $G$-equivariant bundles on Lagrangian submanifolds, and explain how character group of $G$ acts on the theory. As an application, we define an orbifolded Fukaya-Seidel category of a $G$-invariant Lefschetz fibration, and also discuss homological mirror symmetry conjectures with group actions.
description: 81 pages, 12 figures; comments welcome!
title: Disk cutter drilling performance and optimization methods, rock strength correlation and field data analysis
Creators: name: Mafazy, Salum
Publisher: name: Memorial University of Newfoundland
Year: 2023

description: Drilling a rock near the ground surface has an increasing demand for natural resources exploration, such as the recovery of minerals or crushed rock, the application of tunneling in civil engineering, etc. A recent field mine drilling at Baie Verte, located in the North of Newfoundland, Canada, involved a diamond drilling hole (DDH) for core recovery, which was intended for lithology analysis and as a pilot hole and a large diameter hole drilling (LDH) for ore excavation. This thesis includes an investigation of mining drilling on the LDH to determine abnormal drilling low rate of penetration (ROP) performance at a specific depth interval, where drilling data was analyzed based on each lithology. Also rock material characterization was conducted on granite rock to introduce a new method of Semi-Point Load Strength Index (Semi-PLSI) for estimation of the rock strength, and a detailed analysis of the effect of microwave irradiation on rock properties as one of the influencing technology of an increasing ROP. The above studies involve several laboratory tests, which include detailed rock core logging, mechanical tests, cutting size analysis, and mineral liberation analysis (MLA). The study of drilling performance at specific interval was influenced by high rock strength which was caused by a variation of rock micro-structure determined by MLA technology. Also, the rock characterization study of a new approach of Semi-PLSI shows excellent correlation and strength estimation with standard PLSI and other strength tests. Additionally, microwave irradiation (MI) analysis shows a decrease in strength, ultrasound wave velocities and elastic constants of the rock after the rocks are exposed to MI. Also, the effects of MI observed to increase drilling rate of penetration (D-ROP) of the rocks.
More on yet another ideal version of the bounding number
Creators: name: Kwela, Adam
Publisher: name: arXiv
Year: 2024
Subjects: subject: Logic (math.LO)
subject: FOS: Mathematics

description: This is a continuation of the paper [J. Symb. Log. 87 (2022), 1065--1092]. For an ideal $\mathcal{I}$ on $ω$ we denote $\mathcal{D}_{\mathcal{I}}=\{f\inω^ω: f^{-1}[\{n\}]\in\mathcal{I} \text{ for every $n\in ω$}\}$ and write $f\leq_{\mathcal{I}} g$ if $\{n\inω:f(n)>g(n)\}\in\mathcal{I}$, where $f,g\inω^ω$.
 We study the cardinal numbers $\mathfrak{b}(\geq_{\mathcal{I}}\cap (\mathcal{D}_{\mathcal{I}} \times \mathcal{D}_{\mathcal{I}}))$ describing the smallest sizes of subsets of $\mathcal{D}_{\mathcal{I}}$ that are unbounded from below with respect to $\leq_{\mathcal{I}}$.
 In particular, we examine the relationships of $\mathfrak{b}(\geq_{\mathcal{I}}\cap (\mathcal{D}_{\mathcal{I}} \times \mathcal{D}_{\mathcal{I}}))$ with the dominating number $\mathfrak{d}$. We show that, consistently, $\mathfrak{b}(\geq_{\mathcal{I}}\cap (\mathcal{D}_{\mathcal{I}} \times \mathcal{D}_{\mathcal{I}}))>\mathfrak{d}$ for some ideal $\mathcal{I}$, however $\mathfrak{b}(\geq_{\mathcal{I}}\cap (\mathcal{D}_{\mathcal{I}} \times \mathcal{D}_{\mathcal{I}}))\leq\mathfrak{d}$ for all analytic ideals $\mathcal{I}$. Moreover, we give example of a Borel ideal with $\mathfrak{b}(\geq_{\mathcal{I}}\cap (\mathcal{D}_{\mathcal{I}} \times \mathcal{D}_{\mathcal{I}}))=add(\mathcal{M})$.
PROBABILITY OF GENERATIONAL AGRICULTURAL SUCCESSION EXPLAINED THROUGH A HOLISTIC STRUCTURAL EQUATIONS MODEL IN COSTA RICA
Creators: name: Rodriguez-Lizano, Víctor
name: Montero-Vega, Mercedes
name: Rodriguez-Lizano, Víctor
name: Montero-Vega, Mercedes
Publisher: name: Unknown
Year: 2020
Subjects: subject: Agricultural and Food Policy
subject: Agricultural Finance
subject: International Relations/Trade
subject: Marketing
subject: FOS: Economics and business
subject: Political Economy
subject: Production Economics
subject: Productivity Analysis
subject: Agricultural planning
subject: family farms
subject: horticulture
subject: econometric models
subject: Costa Rica

description: Most of the quantitative studies only analyse socioeconomic variables, leaving aside psychological aspects or generational integration related factors. This approach has exhibited low explicative power of the problem. The main objective of this investigation is to obtain the weight that the socioeconomic, psychological and generational integration process variables have over agricultural succession through structural equations. The data was obtained from 126 horticulture farms from Zarcero, Costa Rica. The results indicate that the generational integration process is the determining factor of generational succession, which is accurately explained through the psychological factors exposed by the theory of planned behaviour. The socioeconomic variables add little to the understanding of the problem. These results demonstrate that regardless of the socioeconomic conditions, the key determining factor is the integration of the sons/daughters in the farm activities.
A model structure and Hopf-cyclic theory on the category of coequivariant modules over a comodule algebra
Creators: name: Ohara, Mariko
Publisher: name: arXiv
Year: 2024
Subjects: subject: K-Theory and Homology (math.KT)
subject: FOS: Mathematics
subject: 16T15, 18G20, 57T05, 55N25

description: Let H be a coFrobenius Hopf algebra over a field k. Let A be a right H-comodule algebra over k.
 We recall that the category of right H-comodules admits a certain model structure whose homotopy category is equivalent to the stable category of right H-comodules given in Farina's paper. In the first part of this paper, we show that the category of left A-module objects in the category of right H-comodules admits a model structure, which becomes a model subcategory of the category of H*-equivariant A-modules endowed with a model structure given in the author's previous paper if H is finite dimensional with a certain assumption. Note that this category is not a Frobenius category in general. We also construct a functorial cofibrant replacement by proceeding the similar argument as in Qi's paper. In the latter half of this paper, we see that cyclic H-comodules which give Hopf-cyclic (co)homology with coefficients in Hopf H-modules are contructible in the homotopy category of right H-comodules, and we investigate a Hopf-cyclic (co)homology in slightly modified setting by assuming A a right H-comodule k-Hopf algebra with H-colinear bijective antipode in stable category of right H-comodules and give an analogue of the characteristic map. We remark that, as an expansion of an idea of taking trivial comodule k as the coefficients, if we take an A-coinvariant part of M assuming M a Hopf A-module in the category of right H-comodules, we have the degree shift of cyclic modules.
description: 23 pages (Revised on Jul.2: we take another injective embedding of M, and modify cylinder and suspention. And, so we remove the condition \Lambda \eta is not equal to zero, which is cosemisimple condition and it has slipped my mind !)
Helium enhanced stars and multiple populations along the horizontal branch of NGC2808: direct spectroscopic measurements
Creators: name: Marino, A. F.
name: Milone, A. P.
name: Przybilla, N.
name: Bergemann, M.
name: Lind, K.
name: Asplund, M.
name: Cassisi, S.
name: Catelan, M.
name: Casagrande, L.
name: Valcarce, A. A. R.
name: Bedin, L. R.
name: Cortes, C.
name: D'Antona, F.
name: Jerjen, H.
name: Piotto, G.
name: Schlesinger, K.
name: Zoccali, M.
name: Angeloni, R.
Publisher: name: arXiv
Year: 2013
Subjects: subject: Solar and Stellar Astrophysics (astro-ph.SR)
subject: FOS: Physical sciences

description: We present an abundance analysis of 96 horizontal branch (HB) stars in NGC2808, a globular cluster exhibiting a complex multiple stellar population pattern. These stars are distributed in different portions of the HB and cover a wide range of temperature. By studying the chemical abundances of this sample, we explore the connection between HB morphology and the chemical enrichment history of multiple stellar populations. For stars lying on the red HB, we use GIRAFFE and UVES spectra to determine Na, Mg, Si, Ca, Sc, Ti, Cr, Mn, Fe, Ni, Zn, Y, Ba, and Nd abundances. For colder, blue HB stars, we derive abundances for Na, primarily from GIRAFFE spectra. We were also able to measure direct NLTE He abundances for a subset of these blue HB stars with temperature higher than ~9000 K. Our results show that: (i) HB stars in NGC2808 show different content in Na depending on their position in the color-magnitude diagram, with blue HB stars having higher Na than red HB stars; (ii) the red HB is not consistent with an uniform chemical abundance, with slightly warmer stars exhibiting a statistically significant higher Na content; and (iii) our subsample of blue HB stars with He abundances shows evidence of enhancement with respect to the predicted primordial He content by Delta(Y)=+0.09+-0.01. Our results strongly support theoretical models that predict He enhancement among second generation(s) stars in globular clusters and provide observational constraints on the second-parameter governing HB morphology.
description: 20 pages, 16 figures, 8 tables; accepted for publication in MNRAS
Accelerating Phase Field Simulations Through a Hybrid Adaptive Fourier Neural Operator with U-Net Backbone
Creators: name: Bonneville, Christophe
name: Bieberdorf, Nathan
name: Hegde, Arun
name: Asta, Mark
name: Najm, Habib N.
name: Capolungo, Laurent
name: Safta, Cosmin
Publisher: name: arXiv
Year: 2024
Subjects: subject: Computational Engineering, Finance, and Science (cs.CE)
subject: Computer Vision and Pattern Recognition (cs.CV)
subject: Machine Learning (cs.LG)
subject: Numerical Analysis (math.NA)
subject: FOS: Computer and information sciences
subject: FOS: Mathematics

description: Prolonged contact between a corrosive liquid and metal alloys can cause progressive dealloying. For such liquid-metal dealloying (LMD) process, phase field models have been developed. However, the governing equations often involve coupled non-linear partial differential equations (PDE), which are challenging to solve numerically. In particular, stiffness in the PDEs requires an extremely small time steps (e.g. $10^{-12}$ or smaller). This computational bottleneck is especially problematic when running LMD simulation until a late time horizon is required. This motivates the development of surrogate models capable of leaping forward in time, by skipping several consecutive time steps at-once. In this paper, we propose U-Shaped Adaptive Fourier Neural Operators (U-AFNO), a machine learning (ML) model inspired by recent advances in neural operator learning. U-AFNO employs U-Nets for extracting and reconstructing local features within the physical fields, and passes the latent space through a vision transformer (ViT) implemented in the Fourier space (AFNO). We use U-AFNOs to learn the dynamics mapping the field at a current time step into a later time step. We also identify global quantities of interest (QoI) describing the corrosion process (e.g. the deformation of the liquid-metal interface) and show that our proposed U-AFNO model is able to accurately predict the field dynamics, in-spite of the chaotic nature of LMD. Our model reproduces the key micro-structure statistics and QoIs with a level of accuracy on-par with the high-fidelity numerical solver. We also investigate the opportunity of using hybrid simulations, in which we alternate forward leap in time using the U-AFNO with high-fidelity time stepping. We demonstrate that while advantageous for some surrogate model design choices, our proposed U-AFNO model in fully auto-regressive settings consistently outperforms hybrid schemes.
Exponential turnpike property for particle systems and mean-field limit
Creators: name: Herty, Michael
name: Zhou, Yizhou
Publisher: name: arXiv
Year: 2024
Subjects: subject: Optimization and Control (math.OC)
subject: FOS: Mathematics
subject: 93C20, 35Q89, 49N10

description: This work is concerned with the exponential turnpike property for optimal control problems of particle systems and their mean-field limit. Under the assumption of the strict dissipativity of the cost function, exponential estimates for both optimal states and optimal control are proven. Moreover, we show that all the results for particle systems can be preserved under the limit in the case of infinitely many particles.
description: 24 pages
README_112922
Creators: name: Admin, AuditoryLab
name: Oszczapinska, Urszula
Publisher: name: Carnegie Mellon University
Year: 2022
Subjects: subject: 179999 Psychology and Cognitive Sciences not elsewhere classified
subject: FOS: Psychology

description: This is a README file for the supplementary materials for:
 Oszczapinska, U., & Heller, L. M. (2022). The underlying temporal features in the transition from bouncing to rolling. Auditory Perception and Cognition. https://doi.org/10.1080/25742442.2022.2143201
Strong-coupling expansion for ultracold bosons in an optical lattice at finite temperatures in the presence of superfluidity
Creators: name: Gupta, Manjari
name: Krishnamurthy, H. R.
name: Freericks, J. K.
Publisher: name: arXiv
Year: 2013
Subjects: subject: Quantum Gases (cond-mat.quant-gas)
subject: FOS: Physical sciences

description: We develop a strong-coupling ($t \ll U$) expansion technique for calculating the density profile for bosonic atoms trapped in an optical lattice with an overall harmonic trap at finite temperature and finite on site interaction in the presence of superfluid regions. Our results match well with quantum Monte Carlo simulations at finite temperature. We also show that the superfluid order parameter never vanishes in the trap due to proximity effect. Our calculations for the scaled density in the vacuum to superfluid transition agree well with the experimental data for appropriate temperatures. We present calculations for the entropy per particle as a function of temperature which can be used to calibrate the temperature in experiments. We also discuss issues connected with the demonstration of universal quantum critical scaling in the experiments.
description: 11 pages, 9 figures
Echo chamber effects in signed networks
Creators: name: Vendeville, Antoine
name: Diaz-Diaz, Fernando
Publisher: name: arXiv
Year: 2024
Subjects: subject: Physics and Society (physics.soc-ph)
subject: FOS: Physical sciences

description: Echo chamber effects in social networks are generally attributed to the prevalence of interactions among like-minded peers. However, recent evidence has emphasized the role of hostile interactions between opposite-minded groups. We investigate the role of polarization, identified with structural balance, in the formation of echo chambers in signed networks. To do so, we generalize the Independent Cascade Model and the Linear Threshold Model to describe information propagation in presence of negative edges. Antagonistic connections do not disrupt the flow of information, but instead, alter the way information is framed. Our results show that echo chambers spontaneously emerge in balanced networks, but also in antibalanced ones for specific parameters. This highlights that structural polarization and echo chambers do not necessarily display a one-to-one correspondence, showing instead a complex and often counterintuitive interplay. The robustness of our results is confirmed with a complex contagion model and through simulations in different network topologies, including real-world datasets.
description: Accepted for publication in Physical Review E
Transposed Hinge Structures in Lamellibranchs
Creators: name: Popenoe, Willis Parkison
Publisher: name: California Institute of Technology
Year: 1933
Subjects: subject: Geology
subject: FOS: Earth and related environmental sciences
subject: Paleontology

description: In the course of study of a collection of Eocene fossils
from Claiborne, Alabama, the senior author of this paper noticed two valves, one right and one left, of the lamellibranch Venericardia parva Lea, in which the dentition is partially transposed. Subsequently, the author made an examination of more than five thousand lamellibranch valves, representing both recent and fossil shells, in search of further examples of hinge-transposition. We have found a total number of twenty-six valves exhibiting this variation.

Study of these specimens has revealed some hitherto unreported facts regarding the principles of hinge-transposition. Therefore in this paper, we shall describe and discuss these specimens, and shall present such conclusions as seem justified by the data assembled.

Citations to the literature are made by author, date, and
page, referring to the list at the end of the paper.
Optimized sampling of SDSS-IV MaStar spectra for stellar classification using supervised models
Creators: name: El-Kholy, R. I.
name: Hayman, Z. M.
Publisher: name: arXiv
Year: 2024
Subjects: subject: Solar and Stellar Astrophysics (astro-ph.SR)
subject: Instrumentation and Methods for Astrophysics (astro-ph.IM)
subject: FOS: Physical sciences

description: Supervised machine learning models are increasingly being used for solving the problem of stellar classification of spectroscopic data. However, training such models requires a large number of labelled instances, the collection of which is usually costly in both time and expertise. Active learning algorithms minimize training dataset sizes by keeping only the most informative instances. This paper explores the application of active learning to sampling stellar spectra using data from a highly class-imbalanced dataset. We utilize the MaStar library from the SDSS DR17 along with its associated stellar parameter catalogue. A preprocessing pipeline that includes feature selection, scaling, and dimensionality reduction is applied to the data. Using different active learning algorithms, we iteratively query instances, where the model or committee of models exhibits the highest uncertainty or disagreement, respectively. We assess the effectiveness of the sampling techniques by comparing several performance metrics of supervised-learning models trained on the queried samples with randomly-sampled counterparts. Evaluation metrics include specificity, sensitivity, and the area under the curve; in addition to the Matthew's correlation coefficient, which accounts for class imbalance. We apply this procedure to effective temperature, surface gravity, and iron metallicity, separately. Our results demonstrate the effectiveness of active learning algorithms in selecting samples that produce performance metrics superior to random sampling and even stratified samples, with fewer training instances. Active learning is recommended for prioritizing instance labelling of astronomical-survey data by experts or crowdsourcing to mitigate the high time cost. Its effectiveness can be further exploited in selection of targets for follow-up observations in automated astronomical surveys.
description: 16 pages, 14 figures, 4 tables, comments are welcome
The isomorphism problem for complete Pick algebras: a survey
Creators: name: Salomon, Guy
name: Shalit, Orr
Publisher: name: arXiv
Year: 2014
Subjects: subject: Operator Algebras (math.OA)
subject: Complex Variables (math.CV)
subject: Functional Analysis (math.FA)
subject: FOS: Mathematics
subject: 47L30, 47A13, 46E22

description: Complete Pick algebras - these are, roughly, the multiplier algebras in which Pick's interpolation theorem holds true - have been the focus of much research in the last twenty years or so. All (irreducible) complete Pick algebras may be realized concretely as the algebras obtained by restricting multipliers on Drury-Arveson space to a subvariety of the unit ball; to be precise: every irreducible complete Pick algebra has the form $M_V = \{f|_V : f \in M_d\}$, where $M_d$ denotes the multiplier algebra of the Drury-Arveson space $H^2_d$, and $V$ is the joint zero set of some functions in $M_d$. In recent years several works were devoted to the classification of complete Pick algebras in terms of the complex geometry of the varieties with which they are associated. The purpose of this survey is to give an account of this research in a comprehensive and unified way. We describe the array of tools and methods that were developed for this program, and take the opportunity to clarify, improve, and correct some parts of the literature.
description: 28 pages. Prepared for Proceedings of IWOTA 2014
Serrin's Overdetermined Problem and Constant Mean Curvature Surfaces
Creators: name: del Pino, Manuel
name: Pacard, Frank
name: Wei, Juncheng
Publisher: name: arXiv
Year: 2013
Subjects: subject: Analysis of PDEs (math.AP)
subject: Differential Geometry (math.DG)
subject: FOS: Mathematics

description: For all $N \geq 9$, we find smooth entire epigraphs in $\R^N$, namely smooth domains of the form $Ω: = \{x\in \R^N\ / \ x_N > F (x_1,\ldots, x_{N-1})\}$, which are not half-spaces and in which a problem of the form $Δu + f(u) = 0 $ in $Ω$ has a positive, bounded solution with 0 Dirichlet boundary data and constant Neumann boundary data on $\partial Ω$. This answers negatively for large dimensions a question by Berestycki, Caffarelli and Nirenberg \cite{bcn2}. In 1971, Serrin \cite{serrin} proved that a bounded domain where such an overdetermined problem is solvable must be a ball, in analogy to a famous result by Alexandrov that states that an embedded compact surface with constant mean curvature (CMC) in Euclidean space must be a sphere. In lower dimensions we succeed in providing examples for domains whose boundary is close to large dilations of a given CMC surface where Serrin's overdetermined problem is solvable.
description: 59 pages
Stable division and essential normality: the non-homogeneous and quasi homogeneous cases
Creators: name: Biswas, Shibananda
name: Shalit, Orr
Publisher: name: arXiv
Year: 2015
Subjects: subject: Functional Analysis (math.FA)
subject: Operator Algebras (math.OA)
subject: FOS: Mathematics
subject: 47A13, 47B32 (Primary), 12Y05, 13P10 (Secondary)

description: Let $\mathcal{H}_d^{(t)}$ ($t \geq -d$, $t>-3$) be the reproducing kernel Hilbert space on the unit ball $\mathbb{B}_d$ with kernel \[ k(z,w) = \frac{1}{(1-\langle z, w \rangle)^{d+t+1}} . \] We prove that if an ideal $I \triangleleft \mathbb{C}[z_1, \ldots, z_d]$ (not necessarily homogeneous) has what we call the "approximate stable division property", then the closure of $I$ in $\mathcal{H}_d^{(t)}$ is $p$-essentially normal for all $p>d$. We then show that all quasi homogeneous ideals in two variables have the stable division property, and combine these two results to obtain a new proof of the fact that the closure of any quasi homogeneous ideal in $\mathbb{C}[x,y]$ is $p$-essentially normal for $p>2$.
description: Some mistakes fixed and details added to the proof of the main result. 17 pages
Detuned Mechanical Parametric Amplification as a Quantum Non-Demolition Measurement
Creators: name: Szorkovszky, Alex
name: Clerk, Aashish A.
name: Doherty, Andrew C.
name: Bowen, Warwick P.
Publisher: name: arXiv
Year: 2014
Subjects: subject: Quantum Physics (quant-ph)
subject: Mesoscale and Nanoscale Physics (cond-mat.mes-hall)
subject: FOS: Physical sciences

description: Recently it has been demonstrated that the combination of weak-continuous position detection with detuned parametric driving can lead to significant steady-state mechanical squeezing, far beyond the 3 dB limit normally associated with parametric driving. In this work, we show the close connection between this detuned scheme and quantum non-demolition (QND) measurement of a single mechanical quadrature. In particular, we show that applying an experimentally realistic detuned parametric drive to a cavity optomechanical system allows one to effectively realize a QND measurement despite being in the bad-cavity limit. In the limit of strong squeezing, we show that this scheme offers significant advantages over standard backaction evasion, not only by allowing operation in the weak measurement and low efficiency regimes, but also in terms of the purity of the mechanical state.
description: 17 pages, 2 figures
Testing the Limits of Interpretation
Creators: name: Shmilovits, Liron
Publisher: name: Apollo - University of Cambridge Repository
Year: 2016

description: PST Energy 7 Shipping LLC v OW Bunker Malta Ltd (The Res Cogitans) was a contest between two arguably incredible propositions. On one side, the appellant shipowners submitted, by an ingenious argument, that they did not have to pay for bunker fuel which they had ordered, received and consumed. On the other side, the respondent oil suppliers countered that the Sale of Goods Act 1979 ("SGA") did not apply to the supply contract. The Court of Appeal opted for the least implausible outcome, holding that the supply contract was not a contract for the sale of goods, and so the shipowners did have to pay for the fuel. In policy terms, the Court’s reasoning challenges recent orthodoxy on contractual interpretation.
README_112822
Creators: name: Admin, AuditoryLab
name: Oszczapinska, Urszula
Publisher: name: Carnegie Mellon University
Year: 2022
Subjects: subject: 179999 Psychology and Cognitive Sciences not elsewhere classified
subject: FOS: Psychology
subject: 170199 Psychology not elsewhere classified

description: This is a README file for the supplementary materials for:
 Oszczapinska, U., & Heller, L. M. (2022). The underlying temporal features in the transition from bouncing to rolling. Auditory Perception and Cognition. https://doi.org/10.1080/25742442.2022.2143201
Data of electrospun carbon nanofibre-based catalysts prepared with Co and Fe phthalocyanine for oxygen reduction in acidic medium
Creators: name: Muuli, Kaur
name: Mooste, Marek
name: Akula, Srinu
name: Gudkova, Viktoria
name: Otsus, Markus
name: Kikas, Arvo
name: Aruväli, Jaan
name: Treshchalov, Alexey
name: Kisand, Vambola
name: Tamm, Aile
name: Krumme, Andres
name: Cavaliere, Sara
name: Tammeveski, Kaido
Publisher: name: Institute of Chemistry, University of Tartu, Ravila 14a, 50411 Tartu, Estonia
Year: 2023
Subjects: Oxygen reduction
CNF
PEMFC
Non-precious metal catalyst
Electrospinning

description: This dataset contains the data presented in the figures of pulbished paper "Electrospun Carbon Nanofibre-Based Catalysts Prepared with Co and Fe Phthalocyanine for Oxygen Reduction in Acidic Medium" ChemElectroChem, e202300131 (https://doi.org/10.1002/celc.202300131). The electrochemical characterisation data, which was measured in University of Tartu Institute of Chemistry, is for Figures 1, 2, 4, 5, 6 and the nomenclature of the catalysts is the same as in the mentioned article.
Fractional Calculus of Variations of Several Independent Variables
Creators: name: Odzijewicz, Tatiana
name: Malinowska, Agnieszka B.
name: Torres, Delfim F. M.
Publisher: name: arXiv
Year: 2013
Subjects: subject: Mathematical Physics (math-ph)
subject: Optimization and Control (math.OC)
subject: FOS: Physical sciences
subject: FOS: Mathematics

description: We prove multidimensional integration by parts formulas for generalized fractional derivatives and integrals. The new results allow us to obtain optimality conditions for multidimensional fractional variational problems with Lagrangians depending on generalized partial integrals and derivatives. A generalized fractional Noether's theorem, a formulation of Dirichlet's principle and an uniqueness result are given.
description: This is a preprint of a paper whose final and definite form is published in Eur. Phys. J. Special Topics 222 (2013), 1811-1824. DOI: 10.1140/epjst/e2013-01966-0 Paper submitted 05-Dec-2012; revised 06-May-2013; accepted 15-May-2013
Parity-Mixed Superconductivity in Locally Non-centrosymmetric System
Creators: name: Yoshida, Tomohiro
name: Sigrist, Manfred
name: Yanase, Youichi
Publisher: name: arXiv
Year: 2013
Subjects: subject: Superconductivity (cond-mat.supr-con)
subject: FOS: Physical sciences

description: We study the parity-mixed superconductivity in locally non-centrosymmetric systems. In multilayer systems an inhomogeneous Rashba spin-orbit coupling is induced by the local violation of inversion symmetry. Our previous study revealed that a pair-density wave (PDW) phase, with a sign-modulated order parameter, is stabilized in the spin-singlet multilayer superconductors owing to the spin-orbit coupling. In this letter, we show that the uniform spin-triplet superconductivity emerges through parity mixing in the PDW phase, taking into account a weak interaction in the spin-triplet channel, which was neglected in our previous study. The spin-triplet superconducting phase is nonunitary owing to field-induced parity mixing. The critical magnetic field is markedly increased by the emergence of spin-triplet superconductivity. We calculate the density of states and analyze the signature specific to this phase.
description: 5 pages, 4 figures, accepted for publication in JPSJ
Spaces of Dirichlet series with the complete Pick property
Creators: name: McCarthy, John E.
name: Shalit, Orr
Publisher: name: arXiv
Year: 2015
Subjects: subject: Functional Analysis (math.FA)
subject: Complex Variables (math.CV)
subject: Operator Algebras (math.OA)
subject: FOS: Mathematics
subject: 46E22, 47B32, 47A13, 30B50

description: We consider reproducing kernel Hilbert spaces of Dirichlet series with kernels of the form $k(s,u) = \sum a_n n^{-s-\bar u}$, and characterize when such a space is a complete Pick space. We then discuss what it means for two reproducing kernel Hilbert spaces to be "the same", and introduce a notion of weak isomorphism. Many of the spaces we consider turn out to be weakly isomorphic as reproducing kernel Hilbert spaces to the Drury-Arveson space $H^2_d$ in $d$ variables, where $d$ can be any number in $\{1,2,\ldots, \infty\}$, and in particular their multiplier algebras are unitarily equivalent to the multiplier algebra of $H^2_d$. Thus, a family of multiplier algebras of Dirichlet series are exhibited with the property that every complete Pick algebra is a quotient of each member of this family. Finally, we determine precisely when such a space of Dirichlet series is weakly isomorphic to $H^2_d$ and when its multiplier algebra is isometrically isomorphic to $Mult(H^2_d)$.
description: 23 pages
Stellar Core Collapse with Hadron-Quark Phase Transition
Creators: name: Nakazato, Ken'ichiro
name: Sumiyoshi, Kohsuke
name: Yamada, Shoichi
Publisher: name: arXiv
Year: 2013
Subjects: subject: High Energy Astrophysical Phenomena (astro-ph.HE)
subject: High Energy Physics - Phenomenology (hep-ph)
subject: Nuclear Theory (nucl-th)
subject: FOS: Physical sciences

description: Hadronic matter undergoes a deconfinement transition to quark matter at high temperature and/or high density. It would be realized in collapsing cores of massive stars. In the framework of MIT bag model, the ambiguities of the interaction are encapsulated in the bag constant. Some progenitor stars that invoke the core collapses explode as supernovae, and other ones become black holes. The fates of core collapses are investigated for various cases. Equations of state including the hadron-quark phase transition are constructed for the cases of the bag constant B=90, 150 and 250 MeV fm^{-3}. To describe the mixed phase, the Gibbs condition is used. Adopting the equations of state with different bag constants, the core collapse simulations are performed for the progenitor models with 15 and 40Msolar. If the bag constant is small as B=90 MeV fm^{-3}, an interval between the bounce and black hole formation is shortened drastically for the model with 40Msolar and the second bounce revives the shock wave leading to explosion for the model with 15Msolar.
description: 5 pages, 5 figures, references corrected, accepted for publication in A&A
Magnetic Signature of Thermo-Electric Cardiac Dynamics
Creators: name: Crispino, Anna
name: Nicoletti, Martina
name: Loppini, Alessandro
name: Gizzi, Alessio
name: Chiodo, Letizia
name: Cherubini, Christian
name: Filippi, Simonetta
Publisher: name: arXiv
Year: 2024
Subjects: subject: Medical Physics (physics.med-ph)
subject: FOS: Physical sciences

description: Developing new methods for predicting electromagnetic instabilities in cardiac activity is of primary importance. However, we still need a comprehensive view of the heart's magnetic activity at the tissue scale. To fill this gap, we present a model of soft active matter, including thermo-electric coupling, suitably modified to reproduce cardiac magnetic field. Our theoretical framework shows that periodic stimulations of cardiac cells create an external magnetic field evidencing restitution features of nonlinear cardiac dynamics and magnetic restitution curves better discriminate instabilities and bifurcations in cardiac activity. This new framework lays the foundation for innovative, non-invasive diagnostic tools for cardiac arrhythmias.
Comprehensive ab initio study of doping in bulk ZnO with group-V elements
Creators: name: Petretto, Guido
name: Bruneval, Fabien
Publisher: name: arXiv
Year: 2014
Subjects: subject: Materials Science (cond-mat.mtrl-sci)
subject: FOS: Physical sciences

description: Despite the lack of reproducible experimental confirmation, group-V elements have been considered as possible sources of p-type doping in ZnO in the form of simple and complex defects. Using ab initio calculations, based on state-of-the-art hybrid exchange-correlation functional, we study a wide range of defects and defect complexes related with N, P, As, and Sb impurities. We show that none of the candidates for p-type doping can be considered a good source of holes in the valence band due to deep acceptor levels and low formation energies of compensating donor defects. In addition, we discuss the stability of complexes in different regimes.
description: 7 pages, 7 figures
Exact solitary wave solutions for a coupled gKdV-Schrodinger system by a new ODE reduction method
Creators: name: Anco, Stephen C.
name: Hornick, James
name: Zhao, Sicheng
name: Wolf, Thomas
Publisher: name: arXiv
Year: 2024
Subjects: subject: Exactly Solvable and Integrable Systems (nlin.SI)
subject: Mathematical Physics (math-ph)
subject: Pattern Formation and Solitons (nlin.PS)
subject: FOS: Physical sciences

description: A new method is developed for finding exact solitary wave solutions of a generalized Korteweg-de Vries equation with p-power nonlinearity coupled to a linear Schrödinger equation arising in many different physical applications. This method yields 22 solution families, with p=1,2,3,4. No solutions for p>1 were known previously in the literature. For p=1, four of the solution families contain bright/dark Davydov solitons of the 1st and 2nd kind, obtained in recent work by basic ansatze applied to the ODE system for travelling waves. All of the new solution families have interesting features, including bright/dark peaks with (up to) p symmetric pairs of side peaks in the amplitude and a kink profile for the nonlinear part in the phase. The present method is fully systematic and involves several novel steps which reduce the travelling wave ODE system to a single nonlinear base ODE for which all polynomial solutions are found by symbolic computation. It is applicable more generally to other coupled nonlinear dispersive wave equations as well as to nonlinear ODE systems of generalized Hénon-Heiles form.
description: 45 pages, published version
La Neutro-Geometría y la Anti-Geometría como Alternativas y Generalizaciones de las Geometrías no Euclidianas Neurometrics and Anti-Geometry as Alternatives and Generalizations of Non-Euclidean Geometries
Creators: name: Smarandache, Florentin
Publisher: name: figshare
Year: 2022
Subjects: Other mathematical sciences not elsewhere classified

description: In this paper we extend Neutro-Algebra and Anti-Algebra to geometric spaces, founding Neutro/Geometry and AntiGeometry. While Non-Euclidean Geometries resulted from the total negation of a specific axiom (Euclid's Fifth Postulate), AntiGeometry results from the total negation of any axiom or even more axioms of any geometric axiomatic system (Euclidean, Hilbert, etc. ) and of any type of geometry such as Geometry (Euclidean, Projective, Finite, Differential, Algebraic, Complex, Discrete, Computational, Molecular, Convex, etc.), and Neutro-Geometry results from the partial negation of one or more axioms [and without total negation of any axiom] of any geometric axiomatic system and of any type of geometry. Generally, instead of a classical geometric Axiom, one can take any classical geometric Theorem of any axiomatic system and of any type of geometry, and transform it by Neutrosophication or Antisofication into a Neutro-Theorem or Anti-Theorem respectively to construct a Neutro-Geometry or Anti-Geometry.
Confronting LHC data with the statistical hadronization model
Creators: name: Stachel, J
name: Andronic, A
name: Braun-Munzinger, P
name: Redlich, K
Publisher: name: arXiv
Year: 2013
Subjects: subject: Nuclear Theory (nucl-th)
subject: FOS: Physical sciences

description: The most recent data from the CERN LHC are compared with calculations within the statistical hadronization model. The parameters temperature und baryon chemical potential are fitted to the data. The best fit yields a temperature of 156 MeV, slightly below the expectation from RHIC data. Proton yields are nearly three standard deviations below this fit and possible reasons are discussed.
description: Proceedings of Strange Quark Matter 2013 Conference, to be published in J. Phys. G
Tests of model predictions for the response of stellar spectra and absorption line indices to element abundance variations
Creators: name: Sansom, A. E.
name: Milone, A. de Castro
name: Vazdekis, A.
name: Sanchez-Blazquez, P.
Publisher: name: arXiv
Year: 2013
Subjects: subject: Solar and Stellar Astrophysics (astro-ph.SR)
subject: Cosmology and Nongalactic Astrophysics (astro-ph.CO)
subject: FOS: Physical sciences

description: To analyse stellar populations in galaxies a widely used method is to apply theoretically derived responses of stellar spectra and line indices to element abundance variations, hereafter referred to as response functions. These are applied in a differential way, to base models, in order to generate spectra or indices with different abundance patterns. In this paper sets of such response functions for three different stellar evolutionary stages are tested with new empirical [Mg/Fe] abundance data for the MILES stellar spectral library. Recent theoretical models and observations are used to investigate the effects of [Fe/H], [Mg/H] and overall [Z/H] on spectra, via ratios of spectra for similar stars. Global effects of changes in abundance patterns are investigated empirically through direct comparisons of similar stars from the MILES library, highlighting the impact of abundance effects in the blue part of the spectrum, particularly for lower temperature stars. It is found that the relative behaviour of iron sensitive line indices are generally well predicted by response functions, whereas Balmer line indices are not. Other indices tend to show large scatter about the predicted mean relations. Implications for element abundance and age studies in stellar populations are discussed and ways forward are suggested to improve the match with behaviours of spectra and line strength indices observed in real stars.
description: 26 pages, 15 figures, 9 tables, accepted for publication in MNRAS
Unification theory of instabilities of visco-diffusive swirling flows
Creators: name: Kirillov, Oleg N.
name: Mutabazi, Innocent
Publisher: name: arXiv
Year: 2024
Subjects: subject: Fluid Dynamics (physics.flu-dyn)
subject: Solar and Stellar Astrophysics (astro-ph.SR)
subject: Mathematical Physics (math-ph)
subject: Dynamical Systems (math.DS)
subject: Atmospheric and Oceanic Physics (physics.ao-ph)
subject: FOS: Physical sciences
subject: FOS: Mathematics

description: A universal theory of linear instabilities in swirling flows, occurring in both natural settings and industrial applications, is formulated. The theory encompasses a wide range of open and confined flows, including spiral isothermal flows and baroclinic flows driven by radial temperature gradients and natural gravity in rotating fluids. By employing short-wavelength local analysis, the theory generalizes previous findings from numerical simulations and linear stability analyses of specific swirling flows, such as spiral Couette flow, spiral Poiseuille flow, and baroclinic Couette flow. A general criterion, extending and unifying existing criteria for instability to both centrifugal and shear-driven perturbations in swirling flows is derived, taking into account viscosity and thermal diffusion, and guiding experimental and numerical investigations in the otherwise inaccessible parameter regimes.
description: 7 pages, 3 figures, typos corrected, refs added
title: Rightness as Justifiability: Thomas Scanlon’s moral contractualism
Creators: name: Mardellat, Victor
Publisher: name: Politika.io
Year: 2018

description: This text presents an overview of the moral theory developed by Thomas Scanlon in response to the failure of utilitarianism to justify valid moral principles, and the incapacity of consequentialism to explain the importance we attach to respecting the legitimate demands of others. It starts by presenting the objectives motivating contractualism, and then explains the reasons why this theory conceives of the underpinnings of morality in terms of interpersonal justifiability, insisting on what distinguishes moral contractualism from the political theories put forward by advocates of the social contract, from Hobbes to Rawls. Finally, it presents contractualist moral reasoning in detail, and tests the claims of the theory: is it really able to defend judgements that match our intuitions without presupposing consequentialist judgements?
Bericht: 3D-Dokumentation eines Schuhleistenkeils aus der Umgebung des Klosters Heiligkreuz in Cham
Creators: name: Künzli, Marco
Publisher: name: Zenodo
Year: 2022

description: Der Schuhleistenkeil, welcher beim Kloster Heiligkreuz in Cham gefunden wurde, ist im Kurs "Aus 2D mach' 3D - Einführung in die bildbasierte 3D-Dokumentation" der Universität Zürich als 3D-Modell erstellt worden.
title: Maidan : nouveau protagoniste du politique.
Creators: name: Göle, Nilüfer
Publisher: name: Politika.io
Year: 2018

description: Comment saisir la signification des mouvements de la place publique qui ont émergé dans les années 2010 en différentes parties du monde ? Participent-ils à la globalisation de la société civile ? Signalent-ils un changement paradigmatique dans la manière d’être en société, et dans la mise en relation entre l’expressivité esthétique et la protestation politique ? Il s’agit d’étudier la transformation de l’expérience personnelle dans et par le collectif, les dynamiques de visibilité et d’expressivité des acteurs sur la place publique. On s’attache à réfléchir sur la démocratie de la place publique et l’apparition de maidan comme nouveau protagoniste du politique. Les mouvements de la place font apparaître, à l’échelle plus proche du vécu et de l’intime, des formes singulières de la vie dans la production du commun. En partant de la personne et de son expressivité, en mettant en avant la « personne » dans les affaires du « public », ces mouvements inventent un mode d’engagement et d’agir public qui se distingue des formes précédentes d'action collective.
Dark Sector spectroscopy at the ILC
Creators: name: Andersen, Jeppe R.
name: Rauch, Michael
name: Spannowsky, Michael
Publisher: name: arXiv
Year: 2013
Subjects: subject: High Energy Physics - Phenomenology (hep-ph)
subject: FOS: Physical sciences

description: Recent studies have shown that searches in the mono-photon and missing energy final state can be used to discover dark matter candidates at the ILC. While an excess in this final state over the Standard Model background would indicate the existence of a dark sector, no detailed information about the internal structure of this sector can be inferred. Here, we demonstrate how just a few observables can discriminate between various realizations of dark sectors, including e.g. the spin of mediators.
All Next-to-Next-to-Extremal One-Loop Correlators of AdS Supergluons and Supergravitons
Creators: name: Huang, Zhongjie
name: Wang, Bo
name: Yuan, Ellis Ye
Publisher: name: arXiv
Year: 2024
Subjects: subject: High Energy Physics - Theory (hep-th)
subject: FOS: Physical sciences

description: We bootstrap all of the next-next-to-extremal one-loop four-point correlators of supergravitons and supergluons in ${\rm AdS_5}$ using a differential representation, and obtain closed formulas that are valid in both position space and Mellin space simultaneously.
description: v1: 10 pages + 1 Mathematica notebook. v2: typo corrections. v3: the published version
RSP-Based Analysis for Sparsest and Least $\ell_1$-Norm Solutions to Underdetermined Linear Systems
Creators: name: Zhao, Yunbin
Publisher: name: arXiv
Year: 2013
Subjects: subject: Information Theory (cs.IT)
subject: FOS: Computer and information sciences

description: Recently, the worse-case analysis, probabilistic analysis and empirical justification have been employed to address the fundamental question: When does $\ell_1$-minimization find the sparsest solution to an underdetermined linear system? In this paper, a deterministic analysis, rooted in the classic linear programming theory, is carried out to further address this question. We first identify a necessary and sufficient condition for the uniqueness of least $\ell_1$-norm solutions to linear systems. From this condition, we deduce that a sparsest solution coincides with the unique least $\ell_1$-norm solution to a linear system if and only if the so-called \emph{range space property} (RSP) holds at this solution. This yields a broad understanding of the relationship between $\ell_0$- and $\ell_1$-minimization problems. Our analysis indicates that the RSP truly lies at the heart of the relationship between these two problems. Through RSP-based analysis, several important questions in this field can be largely addressed. For instance, how to efficiently interpret the gap between the current theory and the actual numerical performance of $\ell_1$-minimization by a deterministic analysis, and if a linear system has multiple sparsest solutions, when does $\ell_1$-minimization guarantee to find one of them? Moreover, new matrix properties (such as the \emph{RSP of order $K$} and the \emph{Weak-RSP of order $K$}) are introduced in this paper, and a new theory for sparse signal recovery based on the RSP of order $K$ is established.