cometadata/datacite-rtg-text-other-reclassification-records huggingface dataset:
Magnetization dynamics fingerprints of an excitonic condensate $t_{2g}^{4}$ magnet
Creators: name: Kaushal, Nitin
name: Herbrych, Jacek
name: Alvarez, Gonzalo
name: Dagotto, Elbio
Publisher: name: arXiv
Year: 2021
Subjects: subject: Strongly Correlated Electrons (cond-mat.str-el)
subject: FOS: Physical sciences

description: The competition between spin-orbit coupling $λ$ and electron-electron interaction $U$ leads to a plethora of novel states of matter, extensively studied in the context of $t_{2g}^4$ and $t_{2g}^5$ materials, such as ruthenates and iridates. Excitonic magnets -- the antiferromagnetic state of bounded electron-hole pairs -- is a prominent example of phenomena driven by those competing energy scales. Interestingly, recent theoretical studies predicted that excitonic magnets can be found in the ground-state of spin-orbit-coupled $t_{2g}^4$ Hubbard models. Here, we present a detailed computational study of the magnetic excitations in that excitonic magnet, employing one-dimensional chains (via density matrix renormalization group) and small two-dimensional clusters (via Lanczos). Specifically, first we show that the low-energy spectrum is dominated by a dispersive (acoustic) magnonic mode, with extra features arising from the $λ=0$ state in the phase diagram. Second, and more importantly, we found a novel magnetic excitation forming a high-energy optical mode with the highest intensity at wavevector $q\to 0$. In the excitonic condensation regime at large $U$, we also have found a novel high-energy $π$-mode composed solely of orbital excitations. These unique fingerprints of the $t_{2g}^4$ excitonic magnet are important in the analysis of neutron and RIXS experiments.
Figure_GRO_files
Creators: name: Babić, Marko
Publisher: name: figshare
Year: 2024
Subjects: classificationCode: 460207
subject: Modelling and simulation

description: Supramolecular peptide-based materials have great potential for revolutionising fields like nanotechnology and medicine. However, deciphering the intricate sequence-to-assembly pathway, essential for their real-life applications, remains a challenging endeavour. Their discovery relies primarily on empirical approaches that require substantial financial resources, impeding their disruptive potential. Consequently, despite the multitude of characterised self-assembling peptides and their demonstrated advantages, only a few peptide materials have found their way to the market.Machine learning trained on experimentally verified data presents a promising tool for quickly identifying sequences with a high propensity to self-assemble, thereby focussing resource expenditures on the most promising candidates.
Here, we introduce a framework that implements an accurate classifier in a metaheuristic-based generative model to navigate the search through the peptide sequence space of challenging size.
For this purpose, we trained five recurrent neural networks among which the hybrid model that uses sequential information on aggregation propensity and specific physico-chemical properties achieved a superior performance with 81.9\% accuracy and 0.865 F1 score.
Molecular dynamics simulations and experimental validation have confirmed the generative model to be 80-95\% accurate in the discovery of self-assembling peptides, outperforming the current state-of-the-art models.
The proposed modular framework efficiently complements human intuition in the exploration of self-assembling peptides and presents an important step in the development of intelligent laboratories for accelerated material discovery.
Orbital-Selective Mott transition out of band degeneracy lifting
Creators: name: Medici, Luca de'
name: Hassan, S. R.
name: Capone, Massimo
name: Dai, Xi
Publisher: name: arXiv
Year: 2008
Subjects: subject: Strongly Correlated Electrons (cond-mat.str-el)
subject: Superconductivity (cond-mat.supr-con)
subject: FOS: Physical sciences

description: We outline a general mechanism for Orbital-selective Mott transition (OSMT), the coexistence of both itinerant and localized conduction electrons, and show how it can take place in a wide range of realistic situations, even for bands of identical width and correlation, provided a crystal field splits the energy levels in manifolds with different degeneracies and the exchange coupling is large enough to reduce orbital fluctuations. The mechanism relies on the different kinetic energy in manifolds with different degeneracy. This phase has Curie-Weiss susceptibility and non Fermi-liquid behavior, which disappear at a critical doping, all of which is reminiscent of the physics of the pnictides.
description: Published version
title: Using Immune Modulators to Ameliorate Aleutian Disease in Mink
Creators: name: Jung, Kie Hoon
Publisher: name: Utah State University
Year: 2003

description: Aleutian disease of mink (AD) is an immunopathological disorder induced by persistent infection with AD virus. Many breeds of mink seem to have a high susceptibility to AD. Interestingly, the primary feature of AD in susceptible adult mink is a chronic, fatal immune complex-mediated glomerulonephritis comparable to that seen in human diseases such as systemic lupus erythematosus. Because of its comparative aspects to human diseases and the substantial economic loss to the fur industries in the world, classical AD and the nature of the virus has been studied extensively for three decades. Currently no therapies are available and vaccination has been a failure; the latter exacerbated the disease.
The hypothesis tested in this research was that the treatment of AD-infected mink with TGF-β1 and dehydroepiandrosterone (DHEA) inhibited or ameliorated the disease. The hypothesis was tested by evaluating the effects of TGF-β1 and epiandrostene-like compounds on the immune response of AD-infected animals on the normal physiological parameters of animals and by evaluating the effects of both compounds on virus loads.
The TGF-β1 study was designed to evaluate three different doses (200, 100 and 1 ng/kg) of recombinant human TGF-β1 and one dose (500 ng/kg) of TGF-β1 inhibitor at three different times (treated TGF-β1 2 weeks pre-, 8 hours post-, and 2 weeks post-virus inoculation) of administration relative to virus exposure. Animals were administered drug or placebo intravenously via the inguinal vein injection and animals were held to up to 9 months.
For the epiandrosterone study, five mink received 16 ng/kg HE2300 once per week, 17 animals received 16 ng/kg HE2300 three times per week, and five animals were injected with 16 ng/kg HE2500 three times per week. In addition, 17 animals received vehicle three times per week. All treatments were injected subcutaneously into the nape of the neck of the mink. Animals were held to up to 8 months.
Pathological analysis of various physical, physiological and immunological parameters in surviving mink treated with either immunomodulator (treated with TGF-β1 at 100 ng/kg and treated with HE2300 at 16 ng/kg three times per week) revealed that these parameters were near the levels measured for normal uninfected mink. In contrast, in untreated infected animals the measured virus pathology, and physiological and immunological parameters were significantly different from the untreated control animals. In a comparison of survival times, treated animals with either immunomodulator survived almost twice as long as untreated animals. A polymerase chain reaction (PCR) assay of lymph node tissue confirmed that AD-infected animals treated with either immunomodulator had significantly lower levels of virus DNA than untreated infected animals.
These findings support the hypothesis that TGF-β 1 and DHEA and its analogs may afford mink protection from chronic lethal AD.
Onset of synchronization in coupled Mixmaster oscillators
Creators: name: Cotsakis, Spiros
Publisher: name: arXiv
Year: 2020
Subjects: subject: General Relativity and Quantum Cosmology (gr-qc)
subject: High Energy Physics - Theory (hep-th)
subject: FOS: Physical sciences

description: We consider the problem of asymptotic synchronization of different spatial points coupled to each other in inhomogeneous spacetime and undergoing chaotic Mixmaster oscillations towards the singularity. We demonstrate that for couplings larger than some threshold value, two Mixmaster spatial points $A,B$, with $A$ in the past of $B$, synchronize and thereby proceed in perfect unison towards the initial singularity. We further show that there is a Lyapunov function for the synchronization dynamics that makes different spatial points able to synchronize exponentially fast in the past direction. We provide an elementary proof of how an arbitrary spatial point responds to the mean field created by the oscillators, leading to their direct interaction through spontaneous synchronization. These results ascribe a clear physical meaning of early-time synchronization leading to a resetting effect for the two BKL maps corresponding to two distinct oscillating spatial points, as the two maps converge to each other to become indistinguishable at the end of synchronization. Our results imply that the universe generically organizes itself through simpler, synchronized, states as it approaches the initial singularity. A discussion of further implications of early-time inhomogeneous Mixmaster synchronization is also provided.
description: 40 pages, version to appear in the Phil. Trans. Roy. Soc. A
title: Effects of DDT Upon the Hematology and Immunology of the Goldfish (Carassius auratus)
Creators: name: Zeeman, Maurice G.
Publisher: name: Utah State University
Year: 1980

description: DDT can cause hematological and immunological alterations in mammals and birds. Interference with normal hematological and immunological defense systems has been strongly linked to increased incidences of disease and tumors. Fish exposed to pesticides have been noted to be more susceptible to disease. This study examined DDT effects on goldfish hematological and immunological parameters.
Adult goldfish were kept in 250 liter aquaria at 25 ± 1° C. Fish were dosed intraperitoneally with p,p'-DDT in corn oil. Doses ranged from 0 to 500 mg/kg for acute (96 hour) hematology studies to 0 to 50 mg/kg for sub-acute hematology and immunology studies.
The 96 hour LD50's increased from 213 to 480 to 579 mg/kg for groups of fish weighing approximately 20, 50 or 110 grams respectively.
In acute hematology tests, effects of DDT dose upon seven hematological parameters were determined. In general, numbers of erythrocytes and leukocytes (and associated parameters) were decreased with increasing DDT dose. Hematological alterations were moderated as fish size increased.
In the sub-acute tests, effects of repeated sub-lethal doses of DDT upon the hematological parameters and immunological responses of medium-sized fish were investigated over a one to two month span. In general, some of the hematological parameters stabilized after increased duration of DDT exposure. Nevertheless, numbers of leukocytes (especially percent lymphocytes) often remained reduced after DDT treatment.
DDT treatment generally resulted in suppression of primary and secondary immune responses. Numbers of Jerne-plaque forming cells in anterior kidney and spleen were often reduced by DDT pretreatments, as were the serum titers of hemolysin, hemagglutinin and anti-bovine serum albumin. DDT also suppressed the normal rejection of scalegraft transplants (allografts). These results indicated that DDT interfered with the normal humoral and cell-mediated immune responses of this species and may help explain how pesticide exposure could result in increased susceptibility of fish to infectious diseases.
X-ray reflection in accreting stellar-mass black hole systems
Creators: name: Ross, R. R.
name: Fabian, A. C.
Publisher: name: arXiv
Year: 2007
Subjects: subject: Astrophysics (astro-ph)
subject: FOS: Physical sciences

description: The X-ray spectra of accreting stellar-mass black hole systems exhibit spectral features due to reflection, especially broad iron K alpha emission lines. We investigate the reflection by the accretion disc that can be expected in the high/soft state of such a system. First, we perform a self-consistent calculation of the reflection that results from illumination of a hot, inner portion of the disc with its atmosphere in hydrostatic equilibrium. Then we present reflection spectra for a range of illumination strengths and disc temperatures under the assumption of a constant-density atmosphere. Reflection by a hot accretion disc differs in important ways from that of a much cooler disc, such as that expected in an active galactic nucleus.
description: 5 pages with 9 figures, accepted for publication in MNRAS
title: The sky is falling: Planning strategies for communities facing trauma after disaster strikes
Creators: name: Huddlestan, Lindsay Anne
Publisher: name: Electronic version published by Vancouver Island University
Year: 2019
Subjects: subject: Emergency management
subject: Disasters--Psychological aspects
subject: Community mental health services--Planning

description: The prevalence of natural disasters and the negative impacts they have on the mental health of survivors is increasing and for coastal British Columbia natural disasters are inevitable. Research shows local governments lack a standardized strategy utilizing best practice in mental health supports to reduce disaster impacts. Best practices include collaborative, inter-agency programs designed to boost resilience through social infrastructure, early intervention and screening, and community-based programs highlighting capacity and strengths. This major project explores current gaps in planning for mental health supports post-disaster, and proposes a standardized method for local governments to boost efficiency. The outcome of this research includes a template for local governments to plan ahead for disaster psychosocial response to mitigate psychological harm.
Centrality dependence of identified particle elliptic flow in relativistic heavy ion collisions at sNN =7.7-62.4 GeV
Creators: name: (:Unkn) Unknown
Publisher: name: My University
Year: 2016
Subjects: nucl-ex

description: © 2016 American Physical Society. Elliptic flow (v2) values for identified particles at midrapidity in Au + Au collisions measured by the STAR experiment in the Beam Energy Scan at the Relativistic Heavy Ion Collider at sNN=7.7-62.4 GeV are presented for three centrality classes. The centrality dependence and the data at sNN=14.5 GeV are new. Except at the lowest beam energies, we observe a similar relative v2 baryon-meson splitting for all centrality classes which is in agreement within 15% with the number-of-constituent quark scaling. The larger v2 for most particles relative to antiparticles, already observed for minimum bias collisions, shows a clear centrality dependence, with the largest difference for the most central collisions. Also, the results are compared with a multiphase transport (AMPT) model and fit with a blast wave model.
5D Einstein-Maxwell solitons and concentric rotating dipole black rings
Creators: name: Yazadjiev, Stoytcho
Publisher: name: arXiv
Year: 2008
Subjects: subject: High Energy Physics - Theory (hep-th)
subject: FOS: Physical sciences

description: We discuss the application of the solitonic techniques to the 5D Einstein-Maxwell gravity. As an illustration we construct an exact solution describing two concentric rotating dipole black rings. The properties of the solution are investigated.
description: 19 pages, 1 figure
Driving Autonomous Intelligence: How A3 Redefines Governance for the Automotive Industry
Creators: name: Ananda Kumararajah, Vendan
Publisher: name: Zenodo
Year: 2025

description: As leaders, engineers, and innovators navigating a rapidly transforming automotive landscape, we must ask: how do we govern intelligence that evolves on its own terms? The A3 framework offers a roadmap-not just for safety or efficiency, but for building vehicles and mobility systems that think with integrity. This white paper is an invitation to OEMs, Tier 1 suppliers, regulators, and strategic thinkers to co-create a new class of systems: ones that are not just autonomous, but meaningfully accountable. The automotive sector is undergoing a seismic transformation, marked by autonomous vehicles, software-defined architectures, electrification, and ecosystem-level integration. Traditional automotive systems-structured for control, safety, and linear supply chains-are now expected to support intelligent autonomy, decentralized collaboration, and continuous learning. The A3 framework (Aram-Aanavam-Adhikaram) introduces a next-generation governance paradigm specifically suited for this transformation. Unlike existing industry frameworks that focus on compliance, safety standards, or functional integration (e.g., ISO 26262, ASPICE, AUTOSAR), A3 introduces a triadic systems architecture that unifies purpose (Aram), relational complexity (Aanavam), and agentic capability (Adhikaram) at every level of the automotive value chain. This paper explores how A3 complements and extends industry best practices while enabling a transition toward truly adaptive, ethically autonomous, and self-governing vehicle systems and mobility ecosystems.
J/ψ production at low transverse momentum in p+p and d + Au collisions at sNN =200 GeV
Creators: name: (:Unkn) Unknown
Publisher: name: My University
Year: 2016
Subjects: nucl-ex

description: © 2016 American Physical Society. We report on the measurement of J/ψ production in the dielectron channel at midrapidity (|y|<1) in p+p and d+Au collisions at sNN=200GeV from the STAR experiment at the Relativistic Heavy Ion Collider. The transverse momentum pT spectra in p+p for pT<4GeV/c and d+Au collisions for pT<3GeV/c are presented. These measurements extend the STAR coverage for J/ψ production in p+p collisions to low pT. The (pT2) from the measured J/ψ invariant cross section in p+p and d+Au collisions are evaluated and compared to similar measurements at other collision energies. The nuclear modification factor for J/ψ is extracted as a function of pT and collision centrality in d+Au and compared to model calculations using the modified nuclear parton distribution function and a final-state J/ψ nuclear absorption cross section.
Dilute quantum liquid in a K-Rb Bose mixture
Creators: name: Cikojević, Viktor
name: Poli, Elena
name: Ancilotto, Francesco
name: Markić, Leandra Vranješ
name: Boronat, Jordi
Publisher: name: arXiv
Year: 2021
Subjects: subject: Quantum Gases (cond-mat.quant-gas)
subject: Atomic Physics (physics.atom-ph)
subject: Computational Physics (physics.comp-ph)
subject: Fluid Dynamics (physics.flu-dyn)
subject: Quantum Physics (quant-ph)
subject: FOS: Physical sciences

description: A quantum liquid in a heterogeneous mixture of $^{41}$K and $^{87}$Rb atoms is studied using the diffusion Monte Carlo method and Density Functional Theory. The perturbative Lee-Huang-Yang term for a heterogeneous mixture is verified and it is proved to be valid only near the gas-liquid transition. Based on the equations of state of the bulk mixture, calculated with diffusion Monte Carlo, extensions to Lee-Huang-Yang corrected mean-field energy functionals (MF+LHY) are presented. Using Density Functional Theory, a systematic comparison between different functionals is performed, focusing on the critical atom number, surface tension, surface width, Tolman length, and compressibility. These results are given as a function of the inter-species interaction strength, within the stability domain of the liquid mixture.
Neutron electric dipole moment using Nf=2+1+1 twisted mass fermions
Creators: name: (:Unkn) Unknown
Publisher: name: My University
Year: 2016
Subjects: hep-lat
hep-ex
hep-ph
nucl-th

description: © 2016 American Physical Society. We evaluate the neutron electric dipole moment |d→N| using lattice QCD techniques. The gauge configurations analyzed are produced by the European Twisted Mass Collaboration using Nf=2+1+1 twisted mass fermions at one value of the lattice spacing of a≃0.082 fm and a light quark mass corresponding to mπ≃373 MeV. Our approach to extract the neutron electric dipole moment is based on the calculation of the CP-odd electromagnetic form factor F3(Q2) for small values of the vacuum angle θ in the limit of zero Euclidean momentum transfer Q2. The limit Q2→0 is realized either by adopting a parametrization of the momentum dependence of F3(Q2) and performing a fit or by employing new position space methods, which involve the elimination of the kinematical momentum factor in front of F3(Q2). The computation in the presence of a CP-violating term requires the evaluation of the topological charge Q. This is computed by applying the cooling technique and the gradient flow with three different actions, namely the Wilson, the Symanzik tree-level improved and the Iwasaki action. We demonstrate that cooling and gradient flow give equivalent results for the neutron electric dipole moment. Our analysis yields a value of |d→N|=0.045(6)(1)θe·fm for the ensemble with mπ=373 MeV considered.
The Kernel Bundle of a Holomorphic Fredholm Family
Creators: name: (:Unkn) Unknown
Publisher: name: My University
Year: 2013
Subjects: Boundary value problems
Elliptic operators
Manifolds with edge singularities

description: Let Y{script} be a smooth connected manifold, Σ ⊂ ℂ an open set and (σ, y) → P{script}y(σ) a family of unbounded Fredholm operators D ⊂ H 1 → H 2 of index 0 depending smoothly on (y, σ) ∈ Y{script} × Σ and holomorphically on σ. We show how to associate to P{script}, under mild hypotheses, a smooth vector bundle K{script} → Y{script} whose fiber over a given y ∈ Y{script} consists of classes, modulo holomorphic elements, of meromorphic elements φ with P{script}yφ holomorphic. As applications we give two examples relevant in the general theory of boundary value problems for elliptic wedge operators. © 2013 Copyright Taylor and Francis Group, LLC.
Correlation-Driven Insulator-Metal Transition in Near-Ideal Vanadium Dioxide Films
Creators: name: (:Unkn) Unknown
Publisher: name: My University
Year: 2016
Subjects: cond-mat.str-el

description: © 2016 American Physical Society. We use polarization- and temperature-dependent x-ray absorption spectroscopy, in combination with photoelectron microscopy, x-ray diffraction, and electronic transport measurements, to study the driving force behind the insulator-metal transition in VO2. We show that both the collapse of the insulating gap and the concomitant change in crystal symmetry in homogeneously strained single-crystalline VO2 films are preceded by the purely electronic softening of Coulomb correlations within V-V singlet dimers. This process starts 7 K (±0.3 K) below the transition temperature, as conventionally defined by electronic transport and x-ray diffraction measurements, and sets the energy scale for driving the near-room-temperature insulator-metal transition in this technologically promising material.
On an Enhancement of the Category of Shifted L∞-Algebras
Creators: name: (:Unkn) Unknown
Publisher: name: My University
Year: 2017
Subjects: Enriched categories
L-infinity algebras

description: © 2016, Springer Science+Business Media Dordrecht. We construct a symmetric monoidal category SLie∞MC whose objects are shifted L∞-algebras equipped with a complete descending filtration. Morphisms of this category are “enhanced” infinity morphisms between shifted L∞-algebras. We prove that any category enriched over SLie∞MC can be integrated to a simplicial category whose mapping spaces are Kan complexes. The advantage gained by using enhanced morphisms is that we can see much more of the simplicial world from the L∞-algebra point of view. We use this construction in a subsequent paper (Dolgushev et al. Adv. Math. 274, 562–605, 2015) to produce a simplicial model of a (∞,1)-category whose objects are homotopy algebras of a fixed type.
Medical Code Assignment with Gated Convolution and Note-Code Interaction
Creators: name: Ji, Shaoxiong
name: Pan, Shirui
name: Marttinen, Pekka
Publisher: name: arXiv
Year: 2020
Subjects: subject: Computation and Language (cs.CL)
subject: Information Retrieval (cs.IR)
subject: FOS: Computer and information sciences

description: Medical code assignment from clinical text is a fundamental task in clinical information system management. As medical notes are typically lengthy and the medical coding system's code space is large, this task is a long-standing challenge. Recent work applies deep neural network models to encode the medical notes and assign medical codes to clinical documents. However, these methods are still ineffective as they do not fully encode and capture the lengthy and rich semantic information of medical notes nor explicitly exploit the interactions between the notes and codes. We propose a novel method, gated convolutional neural networks, and a note-code interaction (GatedCNN-NCI), for automatic medical code assignment to overcome these challenges. Our methods capture the rich semantic information of the lengthy clinical text for better representation by utilizing embedding injection and gated information propagation in the medical note encoding module. With a novel note-code interaction design and a graph message passing mechanism, we explicitly capture the underlying dependency between notes and codes, enabling effective code prediction. A weight sharing scheme is further designed to decrease the number of trainable parameters. Empirical experiments on real-world clinical datasets show that our proposed model outperforms state-of-the-art models in most cases, and our model size is on par with light-weighted baselines.
description: Findings of ACL-IJCNLP 2021
Zero-temperature phase of the XY spin glass in two dimensions: Genetic embedded matching heuristic
Creators: name: Weigel, Martin
name: Gingras, Michel J. P.
Publisher: name: arXiv
Year: 2007
Subjects: subject: Disordered Systems and Neural Networks (cond-mat.dis-nn)
subject: Statistical Mechanics (cond-mat.stat-mech)
subject: FOS: Physical sciences

description: For many real spin-glass materials, the Edwards-Anderson model with continuous-symmetry spins is more realistic than the rather better understood Ising variant. In principle, the nature of an occurring spin-glass phase in such systems might be inferred from an analysis of the zero-temperature properties. Unfortunately, with few exceptions, the problem of finding ground-state configurations is a non-polynomial problem computationally, such that efficient approximation algorithms are called for. Here, we employ the recently developed genetic embedded matching (GEM) heuristic to investigate the nature of the zero-temperature phase of the bimodal XY spin glass in two dimensions. We analyze bulk properties such as the asymptotic ground-state energy and the phase diagram of disorder strength vs. disorder concentration. For the case of a symmetric distribution of ferromagnetic and antiferromagnetic bonds, we find that the ground state of the model is unique up to a global O(2) rotation of the spins. In particular, there are no extensive degeneracies in this model. The main focus of this work is on an investigation of the excitation spectrum as probed by changing the boundary conditions. Using appropriate finite-size scaling techniques, we consistently determine the stiffness of spin and chiral domain walls and the corresponding fractal dimensions. Most noteworthy, we find that the spin and chiral channels are characterized by two distinct stiffness exponents and, consequently, the system displays spin-chirality decoupling at large length scales. Results for the overlap distribution do not support the possibility of a multitude of thermodynamic pure states.
description: 18 pages, RevTex 4, moderately revised version as published
Chiral Symmetry of Nucleon Resonances in QCD sum rules
Creators: name: Nakamura, T.
name: Gubler, P.
name: Oka, M.
Publisher: name: arXiv
Year: 2008
Subjects: subject: High Energy Physics - Phenomenology (hep-ph)
subject: FOS: Physical sciences

description: The QCD sum rule approach is employed in order to study chiral properties of positive- and negative-parity nucleon resonances. It is pointed out that nucleons with an ``exotic'' chiral property, which can be represented by local five-quark operators, can be paired with a standard nucleon forming a single chiral multiplet. The sum rules of the five-quark operators, however, are shown not to couple strongly to chirally-``exotic'' nucleon resonances at the mass region of less than 2 GeV.
description: 11 pages
Disorder effect on 3-dimensional $Z_2$ quantum spin Hall systems
Creators: name: Shindou, Ryuichi
name: Murakami, Shuichi
Publisher: name: arXiv
Year: 2008
Subjects: subject: Disordered Systems and Neural Networks (cond-mat.dis-nn)
subject: Mesoscale and Nanoscale Physics (cond-mat.mes-hall)
subject: FOS: Physical sciences

description: In this paper, we studied the nonmagnetic disorder effects onto the quantum critical point (QCP) which intervenes an ordinary insulator and the 3-dimensional $Z_2$ quantum spin Hall insulator. The minimal model describing this QCP is the single-copy of the 3+1 Dirac fermion, whose topological mass $m$ induces the quantum phase transition. We derived the phase diagram spanned by this mass-term $m$, chemical potential $μ$ and strength of the disorder within the self-consistent Born approximation. To infer the structure of the low-energy effective theory, we further calculated the weak localization (WL) correction to the conductivity. By way of this, we have found that the diffuson consists of the two quasi-degenerate contributions having the diffusion pole; one always behaves as the diffusion mode. The other becomes the massless mode only at $m=0$. Based on this "two-mode picture", we will discuss the possible microscopic picture of the "levitation and pair annihilation" phenomena, recently discovered by Onoda et al.
description: 30 pages submitted to PRB. The standard WL calculation based on the Kubo formula is newly included, while the previous mode-mode coupling calculations are transferred to the appendices. The physical meaning of the "two-modes" is also made explicit
Quaternionic Wave Packets
Creators: name: De Leo, Stefano
name: Ducati, Gisele C.
Publisher: name: arXiv
Year: 2007
Subjects: subject: Mathematical Physics (math-ph)
subject: FOS: Physical sciences

description: We compare the behavior of a wave packet in the presence of a complex and a pure quaternionic potential step. This analysis, done for a gaussian convolution function, sheds new light on the possibility to recognize quaternionic deviations from standard quantum mechanics.
description: 9 pages, 1 figure
Hund's metallicity enhanced by van Hove singularity in cubic perovskite systems
Creators: name: Lee, Hyeong Jun
name: Kim, Choong H.
name: Go, Ara
Publisher: name: arXiv
Year: 2021
Subjects: subject: Strongly Correlated Electrons (cond-mat.str-el)
subject: FOS: Physical sciences

description: A van Hove singularity (VHS) often significantly amplifies the electronic instability of a crystalline solid, including correlation-induced phenomena such as Hund's metallicity. We perform a systematic study on the interplay between Hund's coupling and electronic structures with a VHS focusing on Hund's metallicity. We construct a simplified tight-binding model targeting cubic perovskite materials and test the effects of the VHS utilizing dynamical mean-field theory with an exact diagonalization solver. The quasiparticle weight and the low-frequency power exponent of the self-energy provide a quantitative estimation of metallicity over the phase diagram. We find the VHS to substantially enhance Hund's metallicity. The results here suggest a range of parameters through which a VHS can bring great synergy with Hund's coupling.
description: 7 pages, 6 figures
Is the Finite-Time Lyapunov Exponent Field a Koopman Eigenfunction?
Creators: name: Bollt, Erik M.
name: Ross, Shane D.
Publisher: name: arXiv
Year: 2021
Subjects: subject: Dynamical Systems (math.DS)
subject: Statistical Mechanics (cond-mat.stat-mech)
subject: Spectral Theory (math.SP)
subject: Chaotic Dynamics (nlin.CD)
subject: FOS: Mathematics
subject: FOS: Physical sciences

description: This work serves as a bridge between two approaches to analysis of dynamical systems: the local, geometric analysis and the global, operator theoretic, Koopman analysis. We explicitly construct vector fields where the instantaneous Lyapunov exponent field is a Koopman eigenfunction. Restricting ourselves to polynomial vector fields to make this construction easier, we find that such vector fields do exist, and we explore whether such vector fields have a special structure, thus making a link between the geometric theory and the transfer operator theory.
description: 30 pages, 4 figures
A new view of quiet-Sun topology from Hinode/SOT
Creators: name: Regnier, S.
name: Parnell, C. E.
name: Haynes, A. L.
Publisher: name: arXiv
Year: 2008
Subjects: subject: Astrophysics (astro-ph)
subject: FOS: Physical sciences

description: With the recent launch of the Hinode satellite our view of the nature and evolution of quiet-Sun regions has been improved. In light of the new high resolution observations, we revisit the study of the quiet Sun's topological nature. Topology is a tool to explain the complexity of the magnetic field, the occurrence of reconnection processes, and the heating of the corona. This Letter aims to give new insights to these different topics. Using a high-resolution Hinode/SOT observation of the line-of-sight magnetic field on the photosphere, we calculate the three dimensional magnetic field in the region above assuming a potential field. From the 3D field, we determine the existence of null points in the magnetic configuration. From this model of a continuous field, we find that the distribution of null points with height is significantly different from that reported in previous studies. In particular, the null points are mainly located above the bottom boundary layer in the photosphere (54%) and in the chromosphere (44%) with only a few null points in the corona (2%). The density of null points (expressed as the ratio of the number of null points to the number of photospheric magnetic fragments) in the solar atmosphere is estimated to be between 3% and 8% depending on the method used to identify the number of magnetic fragments in the observed photosphere. This study reveals that the heating of the corona by magnetic reconnection at coronal null points is unlikely. Our findings do not rule out the heating of the corona at other topological features. We also report the topological complexity of the chromosphere as strongly suggested by recent observations from Hinode/SOT.
description: accepted in A&A Letter
Dissipative Structures in Supersonic Turbulence
Creators: name: Pan, Liubin
name: Padoan, Paolo
name: Kritsuk, Alexei G.
Publisher: name: arXiv
Year: 2008
Subjects: subject: Astrophysics (astro-ph)
subject: FOS: Physical sciences

description: We show that density-weighted moments of the dissipation rate, $ε_l$, averaged over a scale $l$, in supersonic turbulence can be successfully explained by the She and Lévêque model [Phys. Rev. Lett. {\bf 72}, 336 (1994)]. A general method is developed to measure the two parameters of the model, $γ$ and $d$, based directly on their physical interpretations as the scaling exponent of the dissipation rate in the most intermittent structures ($γ$) and the dimension of the structures ($d$). We find that the best-fit parameters ($γ=0.71$ and $d=1.90$) derived from the $ε_l$ scalings in a simulation of supersonic turbulence at Mach 6 agree with their direct measurements, confirming the validity of the model in supersonic turbulence.
description: 4 pages, 3 figures, accepted by Phys. Rev. Lett
An Exactly Solvable Model for Strongly Interacting Electrons in a Magnetic Field
Creators: name: Anand, Abhishek
name: Jain, Jainendra K
name: Sreejith, G J
Publisher: name: arXiv
Year: 2020
Subjects: subject: Strongly Correlated Electrons (cond-mat.str-el)
subject: FOS: Physical sciences

description: States of strongly interacting particles are of fundamental interest in physics, and can produce exotic emergent phenomena and topological structures. We consider here two-dimensional electrons in a magnetic field, and, departing from the standard practice of restricting to the lowest LL, introduce a model short-range interaction that is infinitely strong compared to the cyclotron energy. We demonstrate that this model lends itself to an exact solution for the ground as well as excited states at arbitrary filling factors $ν<1/2p$ and produces a fractional quantum Hall effect at fractions of the form $ν=n/(2pn+ 1)$, where n and p are integers. The fractional quantum Hall states of our model share many topological properties with the corresponding Coulomb ground states in the lowest Landau level, such as the edge physics and the fractional charge of the excitations.
Ciągłość/zmiana/nieciągłość w edukacji. Ujęcie komparatystyczne
Creators: name: Krawiec, Beata
Publisher: name: Instytut Pedagogiki Uniwersytetu Wrocławskiego
Year: 2018

description: Artykuł przedstawia dwa modele oświaty – w Polsce (model metamorfozy) oraz Korei Południowej (model szybkowaru) w ujęciu porównawczym. Prezentuje zmiany w edukacji tych krajów jako ciągłość bądź nieciągłość obowiązujących rozwiązań
A measure concentration effect for matrices of high, higher, and even higher dimension
Creators: name: Yserentant, Harry
Publisher: name: arXiv
Year: 2020
Subjects: subject: Rings and Algebras (math.RA)
subject: Numerical Analysis (math.NA)
subject: FOS: Mathematics
subject: 15A99, 15B52, 60B20

description: Let $n>m$, and let $A$ be an $(m\times n)$-matrix of full rank. Then obviously the estimate $\|Ax\|\leq\|A\|\|x\|$ holds for the euclidean norm of $x$ and $Ax$ and the spectral norm as the assigned matrix norm. We study the sets of all $x$ for which, for fixed $δ<1$, conversely $\|Ax\|\geqδ\,\|A\|\|x\|$ holds. It turns out that these sets fill, in the high-dimensional case, almost the complete space once $δ$ falls below a bound that depends on the extremal singular values of $A$ and on the ratio of the dimensions. This effect has much to do with the random projection theorem, which plays an important role in the data sciences. As a byproduct, we calculate the probabilities this theorem deals with exactly.
description: to appear in SIAM Journal on Matrix Analysis and Applications
title: Natural History, Demography, and Home Range Characteristics of a Southern California Population of Phrynosoma mcallii Inhabiting Atypical Habitat
Creators: name: Setser, Kirk
Publisher: name: Utah State University
Year: 2004

description: Phrynosoma mcallii inhabiting a topographically complex, sparsely vegetated, "mudhill" terrain site in southern California in 1999 and 2000 had low mortality rates, and small clutch sizes compared to previous data from this species. Females likely produced a single clutch of eggs in each year. Although this population occurs near a heavily used OHV trail, I did not detect any mortality due to OHV use.
Lizards did not center home ranges on obvious habitat features. Lizards maintained smaller home ranges and exhibited greater range fidelity than did lizards at other sites in other years. Phrynosoma mcallii share many area-use characters with other phrynosomatid lizards; males maintain home ranges approximately twice as large as females, and lizards maintain home ranges which overlap home ranges of lizards of the opposite sex more than home ranges of lizards of the same sex.
Chemical evolution of Seyfert galaxies
Creators: name: Ballero, S. K.
name: Matteucci, F.
name: Ciotti, L.
Publisher: name: arXiv
Year: 2007
Subjects: subject: Astrophysics (astro-ph)
subject: FOS: Physical sciences

description: We computed the chemical evolution of Seyfert galaxies, residing in spiral bulges, based on an updated model for the Milky Way bulge with updated calculations of the Galactic potential and of the feedback from the central supermassive black hole (BH) in a spherical approximation. We followed the evolution of bulges of masses $2\times 10^{9}-10^{11}M_{\odot}$ by scaling the star-formation efficiency and the bulge scalelenght as in the inverse-wind scenario for ellipticals. We successfully reproduced the observed relation between the BH mass and that of the host bulge, and the observed peak nuclear bolometric luminosity. The observed metal overabundances are easily achieved, as well as the constancy of chemical abundances with the redshift.
description: 2 pages, 1 figure, to appear the proceedings of IAUS245 "Formation and Evolution of Galaxy Bulges"
Deflection of MEMS Based Sandwiched Cantilever Beam for Piezoelectric Actuation: Analysis of Lead Zirconate Titanate Piezoceramic Material
Creators: name: Mahmud, Iftekar
Publisher: name: arXiv
Year: 2021
Subjects: subject: Applied Physics (physics.app-ph)
subject: Materials Science (cond-mat.mtrl-sci)
subject: FOS: Physical sciences

description: This paper investigates the deflection of micro- electro-mechanical system (MEMS) based sandwiched cantilever beam for piezoelectric actuation using eight of the popular lead zirconatetitanate (PZT)piezoceramic material. The simulation for the investigation was carried away in COMSOL Multiphysics software environment. For the investigation of a certain model, the lowest tip deflection is found to be 38.074 nm for PZT-8 and the highest tip deflection is found to be 82.965 nm for PZT-5H. A 2 mm thick flexible foam core is sandwiched between two 8 mm thick aluminum layers in this model of sandwiched cantilever beam, which is 100 mm long. The gadget is replaced with a foam core with a 10 mm long piezoelectric actuator that is located between x=55 mm and x=65 mm. Along the global x-axis, the beam is aligned. The beam changes substantially when the piezoceramic material is changed. The tip deflection of the cantilever beam varies between 37 and 83 nanometers for different lead zirconate titanate piezoceramic materials. PZT-8 has the lowest deflection of 37.074 nm, whereas PZT-7A has the second lowest deflection of 40.423 nm. The maximum tip deflection discovered is more than twice as high as the lowest tip deflection discovered. The deflection of a sandwich cantilever beam for piezoelectric actuation is clearly influenced by piezoceramic materials which can be used in increasing the efficiency of any mechanical device.
description: 5 Pages, 9 figures, 2 tables
Background radiation measurements at high power research reactors
Creators: name: (:Unkn) Unknown
Publisher: name: My University
Year: 2016
Subjects: Research reactors
Background measurements
Reactor antineutrino detection

description: © 2015 Elsevier B.V. Research reactors host a wide range of activities that make use of the intense neutron fluxes generated at these facilities. Recent interest in performing measurements with relatively low event rates, e.g. reactor antineutrino detection, at these facilities necessitates a detailed understanding of background radiation fields. Both reactor-correlated and naturally occurring background sources are potentially important, even at levels well below those of importance for typical activities. Here we describe a comprehensive series of background assessments at three high-power research reactors, including γ-ray, neutron, and muon measurements. For each facility we describe the characteristics and identify the sources of the background fields encountered. The general understanding gained of background production mechanisms and their relationship to facility features will prove valuable for the planning of any sensitive measurement conducted therein.
title: Inorganic Mercury Uptake and Mercury Tolerance Demonstrated by Several Species of Algae
Creators: name: Filip, Daniel S.
Publisher: name: Utah State University
Year: 1972

description: The inhibition by low concentrations of inorganic mercury has been established for several species of freshwater algae, and a method has been developed to determine mercury levels in algal cells, having good precision at levels as low as one hundred parts per billion.
Rapid sorption of inorganic mercury by glassware was minimized by using heavy algal cultures and short term incubations. The rates and extent of mercury uptake by three species of freshwater green algae were delineated under laboratory conditions. Replicate mercury containing cultures yielded slightly different mercury concentrations upon analysis due to analytical errors and glass sorption. Therefore, percent mercury uptake by cells of available mercury at the time of sampling was found to be a reliable index for the rate, extent, and mechanism of mercury uptake.
Search for a light fermiophobic Higgs boson produced via gluon fusion at Hadron Colliders
Creators: name: Arhrib, Abdesslam
name: Benbrik, Rachid
name: Guedes, R. B.
name: Santos, R.
Publisher: name: arXiv
Year: 2008
Subjects: subject: High Energy Physics - Phenomenology (hep-ph)
subject: FOS: Physical sciences

description: In this study, we propose new Higgs production mechanisms with multi-photon final states in the fermiophobic limit of the Two Higgs Doublet Model. The processes are: gg -> hh, gg -> H h followed by H -> h h and gg -> A h followed by A -> h Z. In the fermiophobic limit, gg -> h h and gg -> A h -> h h Z would give rise to 4 photon signature while gg -> H h -> h h h can give a 6 photon final state. We show that both the Fermilab Tevatron and CERN's Large Hadron Collider can probe a substantial slice of the parameter space in this fermiophobic scenario of the Two Higgs Doublet Model. If observed the above processes can give some information on the triple Higgs couplings involved.
description: 9 pages, 13 figures
Proposing a fifth generation Cybernetics Framework
Creators: name: Ananda Kumararajah, Vendan
Publisher: name: Zenodo
Year: 2025

description: This paper examines the A3 model, a conceptual framework proposed by Vendan Ananda Kumararajah, and positions it as a generational shift in cybernetic theory-namely fifth-order cybernetics. The A3 model integrates Aram (ethical coherence), Aanavam (systemic distortion), and Adhikaram (adaptive agency) into a triadic architecture, moving beyond the descriptive and reflexive approaches of earlier cybernetic orders to an explicitly ethicsembedded, agency-aware paradigm. We situate A3 within the evolution of first-through fourthorder cybernetics, emphasizing its capacity to formalize ethical purpose, epistemic discernment, and legitimate action as system design elements. By examining contemporary challenges-such as autonomous AI, hyperautomation, and complex systems governance (CSG)-we show how A3's recursive grammar provides a metacybernetic approach for aligning advanced technological systems with moral values, diagnosing and mitigating distortion, and empowering legitimate adaptive governance. Furthermore, we discuss the implications for organizational transformation and learning and development, highlighting A3 as both a diagnostic lens and a design compass for the 21st century. Ultimately, A3 signals a "cybernetics of stewardship," reimagining system design and governance for an age of planetary-scale complexity and moral urgency.