cometadata/datacite-rtg-text-other-reclassification-records huggingface dataset:
A kind of Lagrangian chaotic property of the Arnold-Beltrami-Childress flow
Creators: name: Qin, Shijie
name: Liao, Shijun
Publisher: name: arXiv
Year: 2022
Subjects: subject: Chaotic Dynamics (nlin.CD)
subject: Computational Physics (physics.comp-ph)
subject: Fluid Dynamics (physics.flu-dyn)
subject: FOS: Physical sciences

description: Three-dimensional steady-state Arnold-Beltrami-Childress (ABC) flow has a chaotic Lagrangian structure, and also satisfies the Navier-Stokes (NS) equations with an external force per unit mass. It is well-known that, although trajectories of a chaotic system have sensitive dependence on initial conditions, i.e. the famous ``butterfly-effect'', their statistical properties are often insensitive to small disturbances. This kind of chaos (such as governed by the Lorenz equations) is called normal-chaos. However, a new concept, i.e. ultra-chaos, has been reported recently, whose statistics are unstable to tiny disturbances. Thus, ultra-chaos represents higher disorder than normal chaos. In this paper, we illustrate that ultra-chaos widely exists in Lagrangian trajectories of fluid particles in steady-state ABC flow. Moreover, solving the NS equation when $Re=50$ with the ABC flow plus a very small disturbance as the initial condition, it is found that trajectories of nearly all fluid particles become ultra-chaotic when the transition from laminar to turbulence occurs. These numerical experiments and facts highly suggest that ultra-chaos should have a relationship with turbulence. This paper identifies differences between ultra-chaos and sensitivity of statistics to parameters. Possible relationships between ultra-chaos and the Poincaré section, ultra-chaos and ergodicity/non-ergodicity, etc., are discussed. The concept of ultra-chaos opens a new perspective of chaos, the Poincaré section, ergodicity/non-ergodicity, turbulence and their inter-relationships.
description: 23 pages, 11 figures, 7 tables
Two-sided vector spaces
Creators: name: Nyman, A.
name: Pappacena, C. J.
Publisher: name: arXiv
Year: 2009
Subjects: subject: K-Theory and Homology (math.KT)
subject: FOS: Mathematics
subject: 15A03

description: We study the structure of two-sided vector spaces over a perfect field $K$. In particular, we give a complete characterization of isomorphism classes of simple two-sided vector spaces which are left finite-dimensional. Using this description, we compute the Quillen $K$-theory of the category of left finite-dimensional, two-sided vector spaces over $K$. We also consider the closely related problem of describing homomorphisms $ϕ:K\to M_n(K)$.
description: 22 pages
Local adaptation, phenotypic plasticity, and species coexistence
Creators: name: Fontanari, José F.
name: Matos, Margarida
name: Santos, Mauro
Publisher: name: arXiv
Year: 2022
Subjects: subject: Populations and Evolution (q-bio.PE)
subject: FOS: Biological sciences

description: Understanding the mechanisms of species coexistence has always been a fundamental topic in ecology. Classical theory predicts that interspecific competition may select for traits that stabilize niche differences, although recent work shows that this is not strictly necessary. Here we ask whether adaptive phenotypic plasticity could allow species coexistence (i.e., some stability at an equilibrium point) without ecological differentiation in habitat use. We used individual-based stochastic simulations defining a landscape composed of spatially uncorrelated or autocorrelated environmental patches, where two species with the same competitive strategies, not able to coexist without some form of phenotypic plasticity, expanded their ranges in the absence of a competition-colonization trade-off (a well-studied mechanism for species diversity). Each patch is characterized by a random environmental value that determines the optimal phenotype of its occupants. In such a scenario, only local adaptation and gene flow (migration) may interact to promote genetic variation and coexistence in the metapopulation. Results show that a competitively inferior species with adaptive phenotypic plasticity can coexist in a same patch with a competitively superior, non-plastic species, provided the migration rates and variances of the patches' environmental values are sufficiently large.
A finite separating set for Daigle and Freudenburg's counterexample to Hilbert's Fourteenth Problem
Creators: name: Dufresne, Emilie
name: Kohls, Martin
Publisher: name: arXiv
Year: 2009
Subjects: subject: Commutative Algebra (math.AC)
subject: FOS: Mathematics
subject: 13A50, 13N15, 14R20

description: This paper gives the first explicit example of a finite separating set in an invariant ring which is not finitely generated, namely, for Daigle and Freudenburg's 5-dimensional counterexample to Hilbert's Fourteenth Problem.
description: 6 pages
Quantum complex scalar fields and noncommutativity
Creators: name: Amorim, Ricardo
name: Abreu, Everton M. C.
Publisher: name: arXiv
Year: 2009
Subjects: subject: High Energy Physics - Theory (hep-th)
subject: FOS: Physical sciences

description: In this work we analyze complex scalar fields using a new framework where the object of noncommutativity $θ^{μν}$ represents independent degrees of freedom. In a first quantized formalism, $θ^{μν}$ and its canonical momentum $π_{μν}$ are seen as operators living in some Hilbert space. This structure is compatible with the minimal canonical extension of the Doplicher-Fredenhagen-Roberts (DFR) algebra and is invariant under an extended Poincaré group of symmetry. In a second quantized formalism perspective, we present an explicit form for the extended Poincaré generators and the same algebra is generated via generalized Heisenberg relations. We also introduce a source term and construct the general solution for the complex scalar fields using the Green's function technique.
description: 13 pages. Latex. Final version to appear in Physical Review D
JURIDICAL REVIEW OF THE RIGHTS AND OBLIGATIONS OF THE PARTIES TO THE LEASING AGREEMENT
Creators: name: DANI KUSTONI
name: BUDI SANTOSO
name: SITI MALIKHATUN
Publisher: name: Zenodo
Year: 2023
Subjects: Review, Juridic, Rights, Obligations, Parties, Leasing Agreement.

description: Abstract
The purpose of this study is to analyze: 1) What is the process of Leasing Agreement? 2) What is the juridical review of the rights and obligations of the parties to the Leasing agreement?. The research method used is empirical juridical with a statutory approach, concept approach, and case studies. The results showed that: 1)  The process of Leasing agreement includes two stages, including: a. Pre-contractual stage (before the occurrence of the agreement) includes: Negotiation (bargaining), Confirmation (notification), Feasibility evaluation, Decision; b. Contractual Stage (occurrence of agreement), At this stage is a series of activities for signing an agreement by the prospective lessee with the lessor. The signing of the agreement is a sign that the prospective lessee has agreed on the content of the standard agreement that has been made by the lessor. At this stage, both parties have agreed to exercise their respective rights and obligations in accordance with the content of the agreement. 2) Article 1338 paragraph (1) of the Indonesian Civil Code regarding agreements applies as law to the parties, meaning that the agreement has binding and coercive force and provides legal certainty for the parties who make it. So that the parties must obey the agreement the same as obeying the law or in other words the parties must carry out the rights and obligations contained in the agreement properly.
Efficient single-grid and multi-grid solvers for real-space orbital-free density functional theory
Creators: name: Bu, Ling-Ze
name: Wang, Wei
Publisher: name: arXiv
Year: 2022
Subjects: subject: Computational Physics (physics.comp-ph)
subject: Quantum Physics (quant-ph)
subject: FOS: Physical sciences

description: To improve the computational efficiencies of the real-space orbital-free density functional theory, this work develops a new single-grid solver by directly providing the closed-form solution to the inner iteration and using an improved bisection method to accelerate the line search process in the outer iteration, and extended the single-grid solver to a multi-grid solver. Numerical examples show that the proposed single-grid solver can improve the computational efficiencies by two orders of magnitude comparing with the methods in the literature and the multi-grid solver can improve the computational efficiencies even once for the cases where high-resolution electron densities are needed.
Unveiling the mechanisms of motion of synchro-Shockley dislocations in Laves phases
Creators: name: Xie, Zhuocheng
name: Chauraud, Dimitri
name: Atila, Achraf
name: Bitzek, Erik
name: Korte-Kerzel, Sandra
name: Guénolé, Julien
Publisher: name: arXiv
Year: 2022
Subjects: subject: Materials Science (cond-mat.mtrl-sci)
subject: FOS: Physical sciences

description: In Laves phases, synchroshear is the dominant basal slip mechanism. It is accomplished by the glide of synchro-Shockley dislocations. However, the atomic-scale mechanisms of motion of such zonal dislocations are still not well understood. In this work, using atomistic simulations, two 30\textdegree{} synchro-Shockley dislocations with different Burgers vectors and core structures and energies are identified. We demonstrate that nucleation and propagation of kink pairs is the energetically favorable mechanism for the motion of the synchro-Shockley dislocation (partial I). Vacancy hopping and interstitial shuffling are identified as two key mechanisms related to kink propagation and we investigated how vacancies and antisite defects assist kink nucleation and propagation, which is crucial for kink mobility. Additionally, we identified a mechanism of non-sequential atomic shuffling for the motion of the synchro-Shockley dislocation (partial II). These findings provide insights into the dependency on temperature and chemical composition of plastic deformation induced by zonal dislocations in Laves phases and the many related topologically close-packed phases.
Quantum oscillations in field-induced correlated insulators of a moiré superlattice
Creators: name: Liu, Le
name: Chu, Yanbang
name: Yang, Guang
name: Yuan, Yalong
name: Wu, Fanfan
name: Ji, Yiru
name: Tian, Jinpeng
name: Yang, Rong
name: Watanabe, Kenji
name: Taniguchi, Takashi
name: Long, Gen
name: Shi, Dongxia
name: Liu, Jianpeng
name: Shen, Jie
name: Lu, Li
name: Yang, Wei
name: Zhang, Guangyu
Publisher: name: arXiv
Year: 2022
Subjects: subject: Mesoscale and Nanoscale Physics (cond-mat.mes-hall)
subject: Strongly Correlated Electrons (cond-mat.str-el)
subject: FOS: Physical sciences

description: We report an observation of quantum oscillations (QOs) in the correlated insulators with valley anisotropy of twisted double bilayer graphene (TDBG). The anomalous QOs are best captured in the magneto resistivity oscillations of the insulators at v = -2, with a period of 1/B and an oscillation amplitude as high as 150 kΩ. The QOs can survive up to ~10 K, and above 12 K, the insulating behaviors are dominant. The QOs of the insulator are strongly D dependent: the carrier density extracted from the 1/B periodicity decreases almost linearly with D from -0.7 to -1.1 V/nm, suggesting a reduced Fermi surface; the effective mass from Lifshitz-Kosevich analysis depends nonlinearly on D, reaching a minimal value of 0.1 me at D = ~ -1.0 V/nm. Similar observations of QOs are also found at v = 2, as well as in other devices without graphite gate. We interpret the D sensitive QOs of the correlated insulators in the picture of band inversion. By reconstructing an inverted band model with the measured effective mass and Fermi surface, the density of state at the gap, calculated from thermal broadened Landau levels, agrees qualitatively with the observed QOs in the insulators. While more theoretical understandings are needed in the future to fully account for the anomalous QOs in this moiré system, our study suggests that TDBG is an excellent platform to discover exotic phases where correlation and topology are at play.
Analysis of the Educative Reform for Secondary School in Mexico and its implications on Science II subject for the new curriculum
Creators: name: Cuervo, Alfonso
name: Mora, Cesar
name: Garcia-Salcedo, Ricardo
Publisher: name: arXiv
Year: 2009
Subjects: subject: Physics Education (physics.ed-ph)
subject: FOS: Physical sciences

description: In Mexico, the educative reform that has been taking effect gradually in the secondary school education from 2005, has eliminated some subjects and created other that they concentrate in a single degree of studies the themes of the basic education, waking up changes that represent a challenge for teachers, who besides are adapted to new academic loads, they face an approach different in the treatment from the new themes. Beyond the conflicts that all reform can generate, the present paper is not a political or social analysis, but it approaches some differences between authorities of Secretaria de Educacion Publica (Public Education Secretary) and teachers, studying the implications of the new curriculum of Sciences II (Physics). Additionally, it is considers the design of didactic sequences to teach some physical concepts in the secondary school by active learning.
description: 9 pages, SPANISH version
Connected Parts of Decuplet Electromagnetic Properties
Creators: name: Tiburzi, B. C.
Publisher: name: arXiv
Year: 2009
Subjects: subject: High Energy Physics - Lattice (hep-lat)
subject: Nuclear Theory (nucl-th)
subject: FOS: Physical sciences

description: We determine the electromagnetic properties of decuplet resonances using chiral perturbation theory at next-to-leading order. Utilizing a partially quenched charge matrix, we isolate and remove the quark disconnected contractions. This allows us to compare the physical meson loop contributions to the connected contributions, of which the latter are currently calculated using lattice QCD. Finally we determine linear combinations of decuplet resonance and hyperon electromagnetic properties that are exactly independent of disconnected contractions in the isospin limit.
description: 4 pages, discussion improved, typos fixed, published version
Pivotal Moments in Student Teaching
Creators: name: Lindhardsen, Vivian
name: Creider, Sarah
Publisher: name: Studies in Applied Linguistics and TESOL
Year: 2019

description: When we first discussed a forum devoted to current and recent student teachers, we simply thought it would be worthwhile to highlight the voices of teachers preparing to work with English Language Learners (ELLs) in our public schools. What we didn’t realize is that we would also hear the voices of their young students—and, in the process, be asked to rethink our own vision of the importance of student teaching.
description: Studies in Applied Linguistics and TESOL, Vol. 19 No. 2 (2019)
Allosteric collaboration between elongation factor G and the ribosomal L1 stalk directs tRNA movements during translation
Creators: name: Fei, Jingyi
name: Bronson, Jonathan E.
name: Hofman, Jake M.
name: Srinivas, Rathi L.
name: Wiggins, Chris H.
name: Gonzalez,, Ruben L.
Publisher: name: arXiv
Year: 2009
Subjects: subject: Biomolecules (q-bio.BM)
subject: Subcellular Processes (q-bio.SC)
subject: FOS: Biological sciences

description: Determining the mechanism by which transfer RNAs (tRNAs) rapidly and precisely transit through the ribosomal A, P and E sites during translation remains a major goal in the study of protein synthesis. Here, we report the real-time dynamics of the L1 stalk, a structural element of the large ribosomal subunit that is implicated in directing tRNA movements during translation. Within pre-translocation ribosomal complexes, the L1 stalk exists in a dynamic equilibrium between open and closed conformations. Binding of elongation factor G (EF-G) shifts this equilibrium towards the closed conformation through one of at least two distinct kinetic mechanisms, where the identity of the P-site tRNA dictates the kinetic route that is taken. Within post-translocation complexes, L1 stalk dynamics are dependent on the presence and identity of the E-site tRNA. Collectively, our data demonstrate that EF-G and the L1 stalk allosterically collaborate to direct tRNA translocation from the P to the E sites, and suggest a model for the release of E-site tRNA.
The Inadequate Use of Confirmatory Factor Analysis in Second Language Acquisition Validation Studies
Creators: name: Vafaee, Payman
name: Kachinske, Ilina
Publisher: name: Studies in Applied Linguistics and TESOL
Year: 2019

description: The current study aims to demonstrate how the lack of a conceptual framework and the inadequate use of confirmatory factor analysis (CFA) in second language (L2) acquisition validation studies can lead to misconceptions about the nature of data collected via different measurement instruments. To this end, we reanalyzed data from three factor-analytic validation studies on several measures of L2 explicit (EXK) and implicit (IMK) knowledge and demonstrated how an inadequate implementation of CFA in these studies has led to unwarranted validity claims. Following several criteria (e.g., presence or absence of time pressure, or drawing of attention to form or meaning), Ellis and Loewen (2007), Bowles (2011), and Zhang (2015) created test batteries that included different types of tests hypothesized to be distinct measures of EXK or IMK. Our re-analysis included the original CFA models retained in these studies, together with new theoretically and empirically plausible alternative models. Results demonstrated that the conclusions reached in the original studies were compromised by the existence of alternative or even equivalent CFA models that fit the date, and the measures included in these batteries were not actually distinct measures of EXK and IMK.
description: Studies in Applied Linguistics and TESOL, Vol. 19 No. 2 (2019)
Polynomial parametrization of the solutions of Diophantine equations of genus 0
Creators: name: Frisch, Sophie
name: Lettl, Günter
Publisher: name: arXiv
Year: 2008
Subjects: subject: Number Theory (math.NT)
subject: Commutative Algebra (math.AC)
subject: FOS: Mathematics
subject: 11D85, 13F20, 11D41, 14H05

description: Let f in Z[X,Y,Z] be a non-constant, absolutely irreducible, homogeneous polynomial with integer coefficients, such that the projective curve given by f=0 has a function field isomorphic to the rational function field Q(t). We show that all integral solutions of the Diophantine equation f=0 (up to those corresponding to some singular points) can be parametrized by a single triple of integer-valued polynomials. In general, it is not possible to parametrize this set of solutions by a single triple of polynomials with integer coefficients.
description: Dedicated to Prof. W. Narkiewicz on the occasion of his 70th birthday. To appear in Functiones et Approximatio. 4 pages
Investigations of one-pot synthetic transformations mediated by sulfuryl fluoride and thionyl fluoride
Creators: name: Bolduc, Trevor G.
Publisher: name: University of British Columbia
Year: 2023

description: The development of mild, selective, efficient, and economical chemical transformations is a foundation of modern synthetic organic chemistry. These chemical processes may be utilized in the syntheses of pharmaceutical compounds, facilitating improved approaches to complex targets. Novel reagents are often created and studied during the development of these more effective protocols. This dissertation explores several synthetic applications of sulfuryl fluoride and thionyl fluoride as reagents in useful chemical processes. Little is known about the synthetic applications of thionyl fluoride, and the work presented herein includes some of the first investigations of this chemical as a reagent in synthetic organic chemistry. Chapter 2 describes the sulfuryl fluoride-mediated transformation of thiols to the corresponding 1,1-dihydrofluoroalkyl sulfide. The primary themes of the work outlined in this chapter include investigations into the chemoselectivity of the title reaction for thiols over other nucleophilic moieties, as well as an expansion of the scope of 1,1-dihydrofluoroalcohols. In Chapter 3, the kinetics of the one-pot sulfuryl fluoride-mediated activation and nucleophilic acyl substitution of carboxylic acids are explored using quantitative 1H and 19F nuclear magnetic resonance spectroscopy. The addition of a tetrabutylammonium halide salt additive as much as doubles the rate of formation of the intermediate acyl fluoride, yet there is no effect on the rate of consumption of this intermediate by the nucleophilic coupling partner. Contributions made to the substrate scope are further outlined in this chapter. Chapter 4 details a comprehensive study of several new synthetic applications of thionyl fluoride in the context of carboxylic acid activation. One-pot, column-free nucleophilic acyl substitutions and one-pot, mild reductions are described in this work. Activated esters, amides, and alcohols are all accessible via the corresponding acyl fluoride intermediate. Chapter 5 explores an expedited one-pot, thionyl-fluoride mediated conversion of sulfinic acids to the corresponding sulfonimidoyl fluoride, utilizing bench-stable and accessible reagents. Sulfonimidoyl fluorides bear both synthetic and pharmaceutical relevance as they enable direct access to other highly desirable sulfur(VI) motifs. This work serves as an advancement over comparable literature protocols as no unstable intermediates need be isolated, and the reaction is conducted in a single reaction vessel.
Affine Schubert classes, Schur positivity, and combinatorial Hopf algebras
Creators: name: Lam, Thomas
Publisher: name: arXiv
Year: 2009
Subjects: subject: Algebraic Geometry (math.AG)
subject: Combinatorics (math.CO)
subject: FOS: Mathematics
subject: 14N15; 05E05

description: We suggest the point of view that the Schubert classes of the affine Grassmannian of a simple algebraic group should be considered as Schur-positive symmetric functions. In particular, we give a geometric explanation of the Schur positivity of k-Schur functions (at t = 1). We also put this in the context of the theory of combinatorial Hopf algebras.
description: 7 pages
Additional file 1 of S100A9 plays a key role in Clostridium perfringens beta2 toxin-induced inflammatory damage in porcine IPEC-J2 intestinal epithelial cells
Creators: name: Li, Jie
name: Xie, Kaihui
name: Yang, Jiaojiao
name: Zhang, Juanli
name: Yang, Qiaoli
name: Wang, Pengfei
name: Gun, Shuangbao
name: Huang, Xiaoyu
Publisher: name: figshare
Year: 2023
Subjects: subject: Genetics
subject: FOS: Biological sciences
subject: Immunology
subject: FOS: Clinical medicine

description: Additional file 1: Supplementary Figure 1. (A) Machine exposure images, (B) Manually exposed image, (C) S100A9 film, (D) β-actin film.
OQAVA SUVLARNING GIGIENIK TAVSIFI
Creators: name: Yadgarova, Sh.S.
Publisher: name: Zenodo
Year: 2023

description: Oqava suv - bu inson faoliyati natijasida ishlatilgan va ifloslangan suvni tasvirlash uchun ishlatiladigan atama. Oqava suvning potentsial xavflarini tushunish va to'g'ri boshqarishni ta'minlash uchun uning gigienik tavsifiga ega bo'lish juda muhimdir.
Motivation and Aptitude: A Partial Validation of ECT-L2A
Creators: name: Kim, Peter
Publisher: name: Studies in Applied Linguistics and TESOL
Year: 2019

description: Energy Conservation Theory of Second Language Acquisition (ECT-L2A; Han, Bao & Wiita, 2017), an interdisciplinary theory juxtaposing a physics perspective and an applied linguistics perspective, conceptualizes individuals’ ultimate attainment as a function of dynamic transformation of endogenous and exogenous energies throughout the learning process. ECT-L2A predicts, inter alia, (1) that beginning L2 learners should show stronger motivation than end-state learners, (2) that developing learners should show higher motivation than that of beginners, and (3) that beginning, developing, and end-state learners should exhibit similar profile in aptitude. These predictions were tested with 56 ESL learners. Correlation analyses were conducted on learners’ aptitude, motivation, years of study, and performance on a timed grammaticality judgment test. The results showed that: (1) with increase in proficiency and years of study, there was a decrease in motivation; (2) the effect of aptitude diminished as learners made progress towards the target language; (3) combined effect of aptitude and motivation correlated positively with the their L2 attainment, but its effects diminished as the proficiency level of the groups became more advanced.
description: Studies in Applied Linguistics and TESOL, Vol. 19 No. 2 (2019)
Candidate counterparts to the soft gamma-ray flare in the direction of LS I +61303
Creators: name: Munoz-Arjonilla, A. J.
name: Marti, J.
name: Combi, J. A.
name: Luque-Escamilla, P.
name: Sanchez-Sutil, J. R.
name: Zabalza, V.
name: Paredes, J. M.
Publisher: name: arXiv
Year: 2009
Subjects: subject: High Energy Astrophysical Phenomena (astro-ph.HE)
subject: Astrophysics of Galaxies (astro-ph.GA)
subject: FOS: Physical sciences

description: Context. A short duration burst reminiscent of a soft gamma-ray repeater/anomalous X-ray pulsar behaviour was detected in the direction of LS I +61 303 by the Swift satellite. While the association with this well known gamma-ray binary is likely, a different origin cannot be excluded. Aims. We explore the error box of this unexpected flaring event and establish the radio, near-infrared and X-ray sources in our search for any peculiar alternative counterpart. Methods. We carried out a combined analysis of archive Very Large Array radio data of LS I +61 303 sensitive to both compact and extended emission. We also reanalysed previous near infrared observations with the 3.5 m telescope of the Centro Astronomico Hispano Aleman and X-ray observations with the Chandra satellite. Results. Our deep radio maps of the LS I +61 303 environment represent a significant advancement on previous work and 16 compact radio sources in the LS I +61 303 vicinity are detected. For some detections, we also identify near infrared and X-ray counterparts. Extended emission features in the field are also detected and confirmed. The possible connection of some of these sources with the observed flaring event is considered. Based on these data, we are unable to claim a clear association between the Swift-BAT flare and any of the sources reported here. However, this study represents the most sophisticated attempt to determine possible alternative counterparts other than LS I +61 303.
description: 5 pages, 2 figures, 3 tables, accepted for publication in Astronomy and Astrophysics
Finite-Momentum Instability of Dynamical Axion Insulator
Creators: name: Curtis, Jonathan B.
name: Petrides, Ioannis
name: Narang, Prineha
Publisher: name: arXiv
Year: 2022
Subjects: subject: Strongly Correlated Electrons (cond-mat.str-el)
subject: High Energy Physics - Theory (hep-th)
subject: FOS: Physical sciences

description: The chiral anomaly is a striking signature of quantum effects which lead to the non-conservation of a classically conserved current, specifically the chiral currents in systems of fermions. In condensed matter systems, the chiral anomaly can be realized in Weyl semimetals, which then exhibit a signature electromagnetic response associated to anomaly due to the separation of the Weyl points in momentum space. In the presence of strong interactions however, a Weyl semimetal phase can give rise to an ordered phase, and spontaneously break the chiral symmetry. This then leads to a Goldstone mode which can have intrinsic dynamics and fluctuations, leading to a dynamical chiral anomaly response -- a situation known as a dynamical axion insulator. Here we consider a simple model of this dynamical axion insulator and calculate the equations of motion for the Goldstone mode. Surprisingly, we find that the Goldstone mode appears to exhibit a negative phase stiffness, signalling a further instability of the system towards finite momentum. This is expected to lead to very strong fluctuations of the anomalous response. We suggest a long-wavelength theory of Lifschitz type which may govern the axion dynamics in this system and comment on possible signatures of this model.
description: 4 pages, 1 figure + 4 pages supplemental; major updates
An Interview with APPLE Lecture Speaker Dr. Paul Kei Matsuda
Creators: name: Beltrán, Jorge
name: Kim, Peter
name: Wang, Arthur Yuanheng
Publisher: name: Studies in Applied Linguistics and TESOL
Year: 2019

description: On February 22, 2019, the Studies in Applied Linguistics and TESOL (SALT) journal had the great pleasure of interviewing Dr. Paul Kei Matsuda, the invited speaker for the 2019 APPLE Lectures Series hosted by the Applied Linguistics and TESOL Program at Teachers College, Columbia University. Dr. Matsuda was kind enough to take the time, during a very busy day, to speak about his research, his work on writing instruction and assessment, his thoughts on World Englishes, and his advice for new scholars working in the fields of Applied Linguistics and TESOL.
description: Studies in Applied Linguistics and TESOL, Vol. 19 No. 1 (2019)
Ferroelectrical spin wave resonance
Creators: name: Yearchuck, D. P.
name: Yerchak, E. D.
name: Kirilenko, A. I.
name: Popechits, V. I.
Publisher: name: arXiv
Year: 2009
Subjects: subject: Other Condensed Matter (cond-mat.other)
subject: FOS: Physical sciences

description: New phenomenon is experimentally identified: ferroelectrical spin wave resonance (FE SWR), which consist in characteristic splitting of vibration (electronic-vibration) levels in optical spectra of interacting localized centers. Spectral positions of ESWR lines are determined in linear approach by quadratic dispersion law. It has been found that the values of resonance mode amplitudes are inversely proportional to mode numbers (by low excitation level). The prediction that Raman-ESWR and IR-ESWR are characterized by splitting constants with different values has been confirmed. Their ratio is approximately equal two (by the frequencies of zero modes reduced to the same value). It is independent argument for FE SWR identification.
description: in russian
Unification of Perdew-Zunger Self-Interaction Correction, DFT+U, and Rung 3.5 Density Functionals
Creators: name: Janesko, Benjamin G.
Publisher: name: arXiv
Year: 2022
Subjects: subject: Chemical Physics (physics.chem-ph)
subject: FOS: Physical sciences

description: We unify the Perdew-Zunger self-interaction correction (PZSIC) to approximate density functional theory (DFT), the Hubbard correction DFT+U, and Rung 3.5 functionals within the Adiabatic Projection formalism. We modify the Kohn-Sham reference system, introducing electron self-interaction in selected states. Choosing those states as localized orbitals, localized atomic states, or states at each point in space recovers PZSIC, DFT+U, and Rung 3.5. Typical Hubbard U parameters approximate scaled-down PZSIC. A Rung 3.5 variant of DFT+U opens a band gap in the homogeneous electron gas.
Fault-Tolerant Facility Location: a randomized dependent LP-rounding algorithm
Creators: name: Byrka, Jaroslaw
name: Srinivasan, Aravind
name: Swamy, Chaitanya
Publisher: name: arXiv
Year: 2010
Subjects: subject: Data Structures and Algorithms (cs.DS)
subject: Discrete Mathematics (cs.DM)
subject: FOS: Computer and information sciences

description: We give a new randomized LP-rounding 1.725-approximation algorithm for the metric Fault-Tolerant Uncapacitated Facility Location problem. This improves on the previously best known 2.076-approximation algorithm of Swamy & Shmoys. To the best of our knowledge, our work provides the first application of a dependent-rounding technique in the domain of facility location. The analysis of our algorithm benefits from, and extends, methods developed for Uncapacitated Facility Location; it also helps uncover new properties of the dependent-rounding approach. An important concept that we develop is a novel, hierarchical clustering scheme. Typically, LP-rounding approximation algorithms for facility location problems are based on partitioning facilities into disjoint clusters and opening at least one facility in each cluster. We extend this approach and construct a laminar family of clusters, which then guides the rounding procedure. It allows to exploit properties of dependent rounding, and provides a quite tight analysis resulting in the improved approximation ratio.
description: conference paper + proofs in appendices
Complexity Theory and Language Development: In celebration of Diane Larsen-Freeman
Creators: name: Zhang, Rainie Minghao
Publisher: name: Studies in Applied Linguistics and TESOL
Year: 2019

description: This book presents a collective effort of scholars in applied linguistics to expand the horizon of the application of Complexity Theory (CT) in the research of second language development (SLD). Ever since the inception of this paradigmatic shift initiated by Diane Larsen-Freeman in 1997, SLD research has gradually transformed to acknowledge, value, and focus on the investigation of the variability and nonlinearity of the SLD process. The curation of this volume includes first a centerpiece by Larsen-Freeman that lays out the theoretical background of CT in SLD research and nine other chapters, both theoretical and empirical, that center around the discussion of SLD as a complex dynamic system. Topics covered include the use of terminology under the CT framework, complex brain structures and language development, research on individual differences, methodological techniques and norms under CT, CT and L2 pedagogy, the multilingual systems, and the ultimate outcome of SLD.
description: Studies in Applied Linguistics and TESOL, Vol. 19 No. 1 (2019)
Coarse-grained models for fluids and their mixtures: Comparison of Monte Carlo studies of their phase behavior with perturbation theory and experiment
Creators: name: Mognetti, B. M.
name: Virnau, P.
name: Yelash, L.
name: Paul, W.
name: Binder, K.
name: Mueller, M.
name: MacDowell, L. G.
Publisher: name: arXiv
Year: 2008
Subjects: subject: Statistical Mechanics (cond-mat.stat-mech)
subject: FOS: Physical sciences

description: The prediction of the equation of state and the phase behavior of simple fluids (noble gases, carbon dioxide, benzene, methane, short alkane chains) and their mixtures by Monte Carlo computer simulation and analytic approximations based on thermodynamic perturbation theory is discussed. Molecules are described by coarse grained (CG) models, where either the whole molecule (carbon dioxide, benzene, methane) or a group of a few successive CH_2 groups (in the case of alkanes) are lumped into an effective point particle. Interactions among these point particles are fitted by Lennard-Jones (LJ) potentials such that the vapor-liquid critical point of the fluid is reproduced in agreement with experiment; in the case of quadrupolar molecules a quadrupole-quadrupole interaction is included. These models are shown to provide a satisfactory description of the liquid-vapour phase diagram of these pure fluids. Investigations of mixtures, using the Lorentz-Berthelot (LB) combining rule, also produce satisfactory results if compared with experiment, while in some previous attempts (in which polar solvents were modelled without explicitly taking into account quadrupolar interaction), strong violations of the LB rules were required. For this reason, the present investigation is a step towards predictive modelling of polar mixtures at low computational cost. These very simple coarse-grained models of small molecules developed here should be useful e.g. for simulations of polymer solutions with such molecules as solvent.
description: J. Chem. Phys., accepted
A Meaning-Based Multiple-Choice Test of Pragmatic Knowledge: Does It Work?
Creators: name: Beltrán, Jorge
Publisher: name: Studies in Applied Linguistics and TESOL
Year: 2019

description: One of the most recent developments in language assessment, the assessment of pragmatic ability, continues to face a number of challenges. Among these, a key issue is that pragmatic ability remains as one of the least understood constructs in the field. While pragmatic ability has been the focus of much research in the last few decades, there is still a lack of consensus as to what components constitute this construct (Timpe-Laughlin, Wain, & Schmidgall, 2015). In addition, researchers differ in their perceptions of how it can be effectively and reliably elicited and assessed, particularly where practicality considerations may be of paramount concern. As such, along with the issue of construct definition, there is the paradox regarding which elicitation methods are to be used in this type of assessment.
description: Studies in Applied Linguistics and TESOL, Vol. 19 No. 1 (2019)
OQAVA SUVLARNING GIGIENIK AHAMIYATINI TUSHUNISH
Creators: name: Yadgarova, Sh.S.
Publisher: name: Zenodo
Year: 2023

description: Oqava suvlarni boshqarish aholi salomatligi va ekologik barqarorlikni saqlashning muhim jihati hisoblanadi. Oqava suvning gigienik tavsifi noto'g'ri boshqarish va yo'q qilish bilan bog'liq bo'lgan sog'liq uchun mumkin bo'lgan xavflarni tushunishda hal qiluvchi rol o'ynaydi. Ushbu maqola oqava suvlarni tozalashda gigiyenik tadbirlarning ahamiyatini va samarali sanitariya amaliyoti zarurligini yoritishga qaratilgan.
Semiclassical and quantum description of motion on noncommutative plane
Creators: name: Baldiotti, M. C.
name: Gazeau, J. P.
name: Gitman, D. M.
Publisher: name: arXiv
Year: 2009
Subjects: subject: Quantum Physics (quant-ph)
subject: High Energy Physics - Theory (hep-th)
subject: FOS: Physical sciences

description: We study the canonical and the coherent state quantization of a particle moving in a magnetic field on a non-commutative plane. Starting from the so called θ-modified action, we perform the canonical quantization and analyze the gauge dependence of the obtained quantum theory. We construct the Malkin-Man'ko coherent states of the system in question, and the corresponding quantization. On this base, we study the relation between the coherent states and the "classical" trajectories predicted by the θ-modified action. In addition, we construct different semiclassical states, making use of special properties of circular squeezed states. With the help of these states, we perform the Berezin-Klauder-Toeplitz quantization and present a numerical exploration of the semiclassical behavior of physical quantities in these states.
description: 20 pages
Anomalous phase behavior of a soft-repulsive potential with a strictly monotonic force
Creators: name: Saija, Franz
name: Prestipino, Santi
name: Malescio, Gianpietro
Publisher: name: arXiv
Year: 2009
Subjects: subject: Soft Condensed Matter (cond-mat.soft)
subject: Materials Science (cond-mat.mtrl-sci)
subject: FOS: Physical sciences

description: We study the phase behavior of a classical system of particles interacting through a strictly convex soft-repulsive potential which, at variance with the pairwise softened repulsions considered so far in the literature, lacks a region of downward or zero curvature. Nonetheless, such interaction is characterized by two length scales, owing to the presence of a range of interparticle distances where the repulsive force increases, for decreasing distance, much more slowly than in the adjacent regions. We investigate, using extensive Monte Carlo simulations combined with accurate free-energy calculations, the phase diagram of the system under consideration. We find that the model exhibits a fluid-solid coexistence line with multiple re-entrant regions, an extremely rich solid polymorphism with solid-solid transitions, and water-like anomalies. In spite of the isotropic nature of the interparticle potential, we find that, among the crystal structures in which the system can exist, there are also a number of non-Bravais lattices, such as cI16 and diamond.
description: 21 pages, 7 figures, in press on Phys. Rev. E
Assessing L2 Pragmatics: Issues and Considerations
Creators: name: Carroll, Brian A.
Publisher: name: Studies in Applied Linguistics and TESOL
Year: 2019

description: Once considered separate and discrete knowledge components, current theoretical and methodological perspectives now view second language (L2) proficiency as a dynamic, cognitive process comprised of several interacting knowledge components and abilities. Theoretical definitions tend to attribute L2 proficiency to two main components. First, the general consensus among L2 assessment researchers is that L2 users leverage their knowledge of the formal and organizational structures of language (i.e., syntax, lexis, and phonology) to comprehend and formulate cohesive discourse. However, pragmatic knowledge, which is responsible for shaping the manner in which these formal structures are comprehended and produced in relation to the context in which they occur, has been more difficult to define and operationalize. This discussion will examine evolving research in the assessment of L2 pragmatic knowledge and indicate gaps between contemporary theoretical definitions, operationalization, and measurement methods.
description: Studies in Applied Linguistics and TESOL, Vol. 19 No. 1 (2019)
Polarized Electrogowdy spacetimes censored
Creators: name: Nungesser, Ernesto
Publisher: name: arXiv
Year: 2009
Subjects: subject: General Relativity and Quantum Cosmology (gr-qc)
subject: FOS: Physical sciences

description: A sketch of the proof of strong cosmic censorship is presented for a class of solutions of the Einstein-Maxwell equations, those with polarized Gowdy symmetry. A key element of the argument is the observation that by means of a suitable choice of variables the central equations in this problem can be written in a form where they are identical to the central equations for general (i.e. non-polarized) vacuum Gowdy spacetimes. Using this it is seen that the results of Ringström on strong cosmic censorship in the vacuum case have implications for the Einstein-Maxwell case. Working out the geometrical meaning of these analytical results leads to the main conclusion.
description: 6 pages, submitted to the conference proceedings of "Spanish relativity meeting 2009"
New Trends in Pragmatics Assessment Research: An Introduction
Creators: name: Beltrán, Jorge
name: Stabler-Havener, Michelle L.
Publisher: name: Studies in Applied Linguistics and TESOL
Year: 2019

description: Even though it can be argued that pragmatics is an important element of the second language (L2) assessment research agenda, a number of challenges have consistently surfaced in this field. For example, adequate coverage of the construct has been consistently formidable, particularly considering that many studies take an atomistic view of pragmatics through their focus on speech acts rather than on contextualized language use (Roever, 2010). Likewise, issues of practicality and benchmarking remain underdeveloped, and understanding regarding the hierarchy of different types of pragmatic meanings continues to be limited (Roever, 2012, 2014). However, in recent years, there have been several attempts to expand our understanding of L2 pragmatics. As illustration, new models of pragmatic ability have been proposed (Purpura, 2017; Timpe-Laughlin, Wain, & Schmidgall, 2015), and it is hoped that these theoretical developments lead to practical applications in L2 pragmatics research and pedagogy.
description: Studies in Applied Linguistics and TESOL, Vol. 19 No. 1 (2019)
The span of singular tuples of a tensor beyond the boundary format
Creators: name: Sodomaco, Luca
name: Turatti, Ettore Teixeira
Publisher: name: arXiv
Year: 2022
Subjects: subject: Algebraic Geometry (math.AG)
subject: FOS: Mathematics
subject: 14N07, 15A18, 15A69

description: A singular $k$-tuple of a tensor $T$ of format $(n_1,\ldots,n_k)$ is essentially a complex critical point of the distance function from $T$ constrained to the cone of tensors of format $(n_1,\ldots,n_k)$ of rank at most one. A generic tensor has finitely many complex singular $k$-tuples, and their number depends only on the tensor format. Furthermore, if we fix the first $k-1$ dimensions $n_i$, then the number of singular $k$-tuples of a generic tensor becomes a monotone non-decreasing function in one integer variable $n_k$, that stabilizes when $(n_1,\ldots,n_k)$ reaches a boundary format. In this paper, we study the linear span of singular $k$-tuples of a generic tensor. Its dimension also depends only on the tensor format. In particular, we concentrate on special order three tensors and order-$k$ tensors of format $(2,\ldots,2,n)$. As a consequence, if again we fix the first $k-1$ dimensions $n_i$ and let $n_k$ increase, we show that in these special formats, the dimension of the linear span stabilizes as well, but at some concise non-sub-boundary format. We conjecture that this phenomenon holds for an arbitrary format with $k>3$. Finally, we provide equations for the linear span of singular triples of a generic order three tensor $T$ of some special non-sub-boundary format. From these equations, we conclude that $T$ belongs to the linear span of its singular triples, and we conjecture that this is the case for every tensor format.
description: 20 pages, 2 tables. Accepted for publication on J. Symbolic Comput
The role of nuclear activity as the power source of ultraluminous infrared galaxies
Creators: name: Nardini, E.
name: Risaliti, G.
name: Watabe, Y.
name: Salvati, M.
name: Sani, E.
Publisher: name: arXiv
Year: 2010
Subjects: subject: Cosmology and Nongalactic Astrophysics (astro-ph.CO)
subject: FOS: Physical sciences

description: We present the results of a 5-8 micron spectral analysis performed on the largest sample of local ultraluminous infrared galaxies (ULIRGs) selected so far, consisting of 164 objects up to a redshift of ~0.35. The unprecedented sensitivity of the Infrared Spectrograph onboard Spitzer allowed us to develop an effective diagnostic method to disentangle the active galactic nucleus (AGN) and starburst (SB) contribution to this class of objects. The intrinsic bolometric corrections are estimated for both the components, in order to obtain the relative AGN/SB contribution to the total luminosity of each source. Our main results are the following: 1) The AGN detection rate among local ULIRGs amounts up to 70 per cent, with 113/164 convincing detections within our sample, while the global AGN/SB power balance is ~1/3. 2) A general agreement is found with optical classification; however, among the objects with no spectral signatures of nuclear activity, our IR diagnostics find a subclass of elusive, highly obscured AGN. 3) We analyse the correlation between nuclear activity and IR luminosity, recovering the well-known trend of growing AGN significance as a function of the overall energy output of the system: the average AGN contribution rises from ~10 to ~60 per cent across the ULIRG luminosity range. 4) We confirm that the AGN content is larger in compact systems, but the link between activity and evolutionary stage is rather loose. 5) By analysing a control sample of IR-luminous galaxies around z ~ 1, we find evidence for only minor changes with redshift of the large-scale spectral properties of the AGN and SB components. This underlines the potential of our method as a straightforward and quantitative AGN/SB diagnostic tool for ULIRG-like systems at high redshift as well.
description: 44 pages, 12 figures, 3 tables. Accepted for publication in MNRAS
Lorentz symmetry breaking and supersymmetry
Creators: name: Nascimento, J. R.
name: Petrov, A. Yu.
Publisher: name: arXiv
Year: 2022
Subjects: subject: High Energy Physics - Theory (hep-th)
subject: High Energy Physics - Phenomenology (hep-ph)
subject: FOS: Physical sciences

description: We discuss three manners to implement Lorentz symmetry breaking in a superfield theory formulated within the superfield formalism, that is, deformation of the supersymmetry algebra, introducing of an extra superfield whose components can depend on Lorentz-violating (LV) vectors (tensors), and adding of new terms proportional to LV vectors (tensors) to the superfield action. We illustrate these methodologies with examples of quantum calculations.
description: Presented at the Ninth Meeting on CPT and Lorentz Symmetry, Bloomington, Indiana, May 17-26, 2022, 4 pages, minor corrections