cometadata/datacite-rtg-text-other-reclassification-records huggingface dataset:
Landauer-Büttiker approach for hyperfine mediated electronic transport in the integer quantum Hall regime
Creators: name: Singha, Aniket
name: Fauzi, M. H.
name: Hirayama, Yoshiro
name: Muralidharan, Bhaskaran
Publisher: name: arXiv
Year: 2016
Subjects: subject: Mesoscale and Nanoscale Physics (cond-mat.mes-hall)
subject: FOS: Physical sciences

description: The interplay of spin-polarized electronic edge states with the dynamics of the host nuclei in quantum Hall systems presents rich and non-trivial transport physics. Here, we develop a Landauer-Büttiker approach to understand various experimental features observed in the integer quantum Hall set ups featuring quantum point contacts. The approach developed here entails a phenomenological description of spin resolved inter-edge scattering induced via hyperfine assisted electron-nuclear spin flip-flop processes. A self-consistent simulation framework between the nuclear spin dynamics and edge state electronic transport is presented in order to gain crucial insights into the dynamic nuclear polarization effects on electronic transport and in turn the electron-spin polarization effects on the nuclear spin dynamics. In particular, we show that the hysteresis noted experimentally in the conductance-voltage trace as well as in the resistively detected NMR lineshape results from a lack of quasi-equilibrium between electronic transport and nuclear polarization evolution. In addition, we present circuit models to emulate such hyperfine mediated transport effects to further facilitate a clear understanding of the electronic transport processes occurring around the quantum point contact. Finally, we extend our model to account for the effects of quadrupolar splitting of nuclear levels and also depict the electronic transport signatures that arise from single and multi-photon processes.
description: 21 pages, 8 figures
Nonminimal couplings, gravitational waves, and torsion in Horndeski's theory
Creators: name: Barrientos, José
name: Cordonier-Tello, Fabrizio
name: Izaurieta, Fernando
name: Medina, Perla
name: Narbona, Daniela
name: Rodríguez, Eduardo
name: Valdivia, Omar
Publisher: name: arXiv
Year: 2017
Subjects: subject: General Relativity and Quantum Cosmology (gr-qc)
subject: Mathematical Physics (math-ph)
subject: FOS: Physical sciences

description: The Horndeski Lagrangian brings together all possible interactions between gravity and a scalar field that yield second-order field equations in four-dimensional spacetime. As originally proposed, it only addresses phenomenology without torsion, which is a non-Riemannian feature of geometry. Since torsion can potentially affect interesting phenomena such as gravitational waves and early Universe inflation, in this paper we allow torsion to exist and propagate within the Horndeski framework. To achieve this goal, we cast the Horndeski Lagrangian in Cartan's first-order formalism, and introduce wave operators designed to act covariantly on p-form fields that carry Lorentz indices. We find that nonminimal couplings and second-order derivatives of the scalar field in the Lagrangian are indeed generic sources of torsion. Metric perturbations couple to the background torsion and new torsional modes appear. These may be detected via gravitational waves but not through Yang-Mills gauge bosons.
description: 13 pages, no figures. v2: updated references. v3: Updated references, new subsection IV.C, accepted for publication in PRD
Information transmission and criticality in the contact process
Creators: name: Cassandro, Marzio
name: Galves, Antonio
name: Löcherbach, Eva
Publisher: name: arXiv
Year: 2017
Subjects: subject: Probability (math.PR)
subject: FOS: Mathematics
subject: 60G55, 60K35, 92B99

description: In the present paper, we study the relation between criticality and information transmission in the one-dimensional contact process with infection parameter $λ.$ To do this we define the {\it sensitivity} of the process to its initial condition. This sensitivity increases for values of $λ< λ_c, $ the value of the critical parameter. The main point of the present paper is that we show that actually it continues increasing even after $ λ_c $ and only starts decreasing for sufficiently large values of $λ.$ This provides a counterexample to the common belief that associates maximal information transmission to criticality.
Octahedral developing of knot complement I: pseudo-hyperbolic structure
Creators: name: Kim, Hyuk
name: Kim, Seonhwa
name: Yoon, Seokbeom
Publisher: name: arXiv
Year: 2016
Subjects: subject: Geometric Topology (math.GT)
subject: FOS: Mathematics
subject: 57M25, 57M50

description: It is known that a knot complement can be decomposed into ideal octahedra along a knot diagram. A solution to the gluing equations applied to this decomposition gives a pseudo-developing map of the knot complement, which will be called a pseudo-hyperbolic structure. In this paper, we study these in terms of segment and region variables which are motivated by the volume conjecture so that we can compute complex volumes of all the boundary parabolic representations explicitly. We investigate the octahedral developing and holonomy representation carefully, and obtain a concrete formula of Wirtinger generators for the representation and also cusp shape. We demonstrate explicit solutions for $T(2,N)$ torus knots, $J(N,M)$ knots and also for other interesting knots as examples. Using these solutions we can observe the asymptotic behavior of complex volumes and cusp shapes of these knots. We note that this construction works for any knot or link, and reflects systematically both geometric properties of the knot complement and combinatorial aspect of the knot diagram.
description: 55 pages, 31 figures
Plasmons in dimensionally mismatched Coulomb coupled graphene systems
Creators: name: Badalyan, S. M.
name: Shylau, A. A.
name: Jauho, A. P.
Publisher: name: arXiv
Year: 2017
Subjects: subject: Mesoscale and Nanoscale Physics (cond-mat.mes-hall)
subject: FOS: Physical sciences

description: We calculate the plasmon dispersion relation for Coulomb coupled metallic armchair graphene nanoribbons and doped monolayer graphene. The crossing of the plasmon curves, which occurs for uncoupled 1D and 2D systems, is split by the interlayer Coulomb coupling into a lower and an upper plasmon branch. The upper branch exhibits a highly unusual behavior with endpoints at finite $q$. Accordingly, the structure factor shows either a single or a double peak behavior, depending on the plasmon wavelength. The new plasmon structure is relevant to recent experiments, its properties can be controlled by varying the system parameters, and be used in plasmonic applications.
description: 5 pages, 3 figures; in press in Phys. Rev. Lett
Working Paper: "System-level Impacts of Voluntary Carbon-free Electricity Procurement Strategies"
Creators: name: Xu, Qingyu
name: Ricks, Wilson
name: Manocha, Aneesha
name: Patankar, Neha
name: Jenkins, Jesse D.
Publisher: name: Zenodo
Year: 2023

description: This study enhances a capacity expansion planning model to study the system-level impacts of carbon-free electricity procurement by voluntary actors in the western United States, accounting for changes in both system operations and installed capacity. We assess multiple proposed strategies for voluntary procurement of new, locally generated carbon-free electricity, including those that match a participating consumer's demand with carbon-free generation on an annual basis ("volumetric matching''), on an hourly basis ("temporal matching''), or aim to eliminate a consumer's emissions impact as measured via short-run marginal emissions accounting ("emissions matching''). We find that in the current U.S. policy environment, voluntary carbon-free electricity procurements made under volumetric or emissions matching strategies have zero or near-zero long-run impact on system-level CO2 emissions. Carbon-free electricity procurements made under these strategies reduce deployment of similar carbon-free resources by independent developers, but have little impact on fossil-fired generation. By contrast, temporal matching drives significant reductions in system-level CO2 emissions by requiring generation of carbon-free electricity even in hours when fossil-based resources would normally be preferred. Temporal matching also incentivizes procurement of advanced clean firm generation and long-duration storage technologies that would not otherwise see market uptake. Electricity cost premiums for voluntary participants are near-zero under volumetric and emissions matching strategies and can exceed $20/MWh under temporal matching, but are reduced when a larger portfolio of advanced technologies is available for procurement. These outcomes are sensitive to changes in policy: while volumetric matching has near-zero impact under current federal and state policies, it is the most cost-effective means of incremental CO2 mitigation in a scenario with a binding system-wide clean electricity standard, although total emissions reductions remain modest.
The full spectrum of AdS5/CFT4 I: Representation theory and one-loop Q-system
Creators: name: Marboe, Christian
name: Volin, Dmytro
Publisher: name: arXiv
Year: 2017
Subjects: subject: High Energy Physics - Theory (hep-th)
subject: Mathematical Physics (math-ph)
subject: FOS: Physical sciences

description: With the formulation of the quantum spectral curve for the AdS5/CFT4 integrable system, it became potentially possible to compute its full spectrum with high efficiency. This is the first paper in a series devoted to the explicit design of such computations, with no restrictions to particular subsectors being imposed. We revisit the representation theoretical classification of possible states in the spectrum and map the symmetry multiplets to solutions of the quantum spectral curve at zero coupling. To this end it is practical to introduce a generalisation of Young diagrams to the case of non-compact representations and define algebraic Q-systems directly on these diagrams. Furthermore, we propose an algorithm to explicitly solve such Q-systems that circumvents the traditional usage of Bethe equations and simplifies the computation effort. For example, our algorithm quickly obtains explicit analytic results for all 495 multiplets that accommodate single-trace operators in N=4 SYM with classical conformal dimension up to 13/2. We plan to use these results as the seed for solving the quantum spectral curve perturbatively to high loop orders in the next paper of the series.
description: 53 pages; v2: minor improvements; v3: published version, details added
Domains for Dirac-Coulomb min-max levels
Creators: name: Esteban, Maria J.
name: Lewin, Mathieu
name: Séré, Eric
Publisher: name: arXiv
Year: 2017
Subjects: subject: Mathematical Physics (math-ph)
subject: Analysis of PDEs (math.AP)
subject: Spectral Theory (math.SP)
subject: Plasma Physics (physics.plasm-ph)
subject: FOS: Physical sciences
subject: FOS: Mathematics

description: We consider a Dirac operator in three space dimensions, with an electrostatic (i.e. real-valued) potential $V(x)$, having a strong Coulomb-type singularity at the origin. This operator is not always essentially self-adjoint but admits a distinguished self-adjoint extension $D\_V$. In a first part we obtain new results on the domain of this extension, complementing previous works of Esteban and Loss. Then we prove the validity of min-max formulas for the eigenvalues in the spectral gap of $D\_V$, in a range of simple function spaces independent of $V$. Our results include the critical case $\liminf\_{x \to 0} |x| V(x)= -1$, with units such that $\hbar=mc^2=1$, and they are the first ones in this situation. We also give the corresponding results in two dimensions.
description: Final version to appear in Rev. Mat. Iberoam
The role of fluctuation-dissipation dynamics in setting initial conditions for inflation
Creators: name: Bastero-Gil, Mar
name: Berera, Arjun
name: Brandenberger, Robert
name: Moss, Ian G.
name: Ramos, Rudnei O.
name: Rosa, Joao G.
Publisher: name: arXiv
Year: 2016
Subjects: subject: Cosmology and Nongalactic Astrophysics (astro-ph.CO)
subject: General Relativity and Quantum Cosmology (gr-qc)
subject: High Energy Physics - Phenomenology (hep-ph)
subject: High Energy Physics - Theory (hep-th)
subject: FOS: Physical sciences

description: We study the problem of initial conditions for slow-roll inflation along a plateau-like scalar potential within the framework of fluctuation-dissipation dynamics. We consider, in particular, that inflation was preceded by a radiation-dominated epoch where the inflaton is coupled to light degrees of freedom and may reach a near-equilibrium state. We show that the homogeneous field component can be sufficiently localized at the origin to trigger a period of slow-roll if the interactions between the inflaton and the thermal degrees of freedom are sufficiently strong and argue that this does not necessarily spoil the flatness of the potential at the quantum level. We further conclude that the inflaton can still be held at the origin after its potential begins to dominate the energy balance, leading to a period of thermal inflation. This then suppresses the effects of nonlinear interactions between the homogeneous and inhomogeneous field modes that could prevent the former from entering a slow-roll regime. Finally, we discuss the possibility of an early period of chaotic inflation, at large field values, followed by a first stage of reheating and subsequently by a second inflationary epoch along the plateau about the origin. This scenario could prevent an early overclosure of the Universe, at the same time yielding a low tensor-to-scalar ratio in agreement with observations.
description: 40 pages, 11 figures, matches version published in JCAP
Countermeasures for Preventing Malicious Infiltration on the Information Technology Supply Chain
Creators: name: Roberts, Leah Michelle
Publisher: name: Purdue University Graduate School
Year: 2023
Subjects: Supply chains

description: Supply chain security continues to be an overlooked field with consequences that can disrupt industrial complexes, cause irreparable harm to critical infrastructure services, and bring unparalleled devastation to human lives. These risks, once constrained to physical tactics, have advanced to undetectable cyber strategies as in the case of the infamous third-party attacks on Target and SolarWinds (Wright, 2021). Moreover, no one sector appears to be immune, as a study by the Government Accountability Office (GAO) found that federal agencies also lag in complying with their own standards as published by the National Institute of Standards and Technology (NIST) (Eyadema, 2021). Throughout this research study, malicious infiltrations propagated by nefarious actors were explored to identify countermeasures and best practices that can be deployed to protect organizations. Often, the lack of defense strategies is not from an absence of information, but from overly complex procedures and a lack of concise requirements. In a recent survey of Department of Defense (DoD) suppliers, 46% of respondents claimed that the supply chain requirements were too difficult to understand, thus reaffirming the importance of creating tools and techniques that are pragmatic and easily implementable (Boyd, 2020).
 The research study presented offered notable safeguards through a literature review of prior studies, standards, and a document analysis of three prominent Information Technology (IT) companies who have made considerable advances in the field of IT supply chain. The results of the research led to the creation of the Roberts Categorization Pyramid which follows a zero-trust framework of “never trust, always verify” (Pavana & Prasad, 2022, p. 2). The pyramid is then further broken down into a formidable six-layer support structure consisting of governance, physical security, sourcing security, manufacturing, hardware security, and software security best practices. Finally, the importance of persistent vigilance throughout the life cycle of IT is highlighted through a continuous monitoring defense strategy layer that engulfs the entirety of the pyramid. Through this compilation of pragmatic countermeasures, supply chain practitioners can become more informed, leading to more mindful decisions and protective requirements in future solicitations and supplier flow-downs.
Moments of zeta and correlations of divisor-sums: V
Creators: name: Conrey, Brian
name: Keating, Jonathan P.
Publisher: name: arXiv
Year: 2017
Subjects: subject: Number Theory (math.NT)
subject: FOS: Mathematics
subject: 11M06, 11M50

description: In this series of papers we examine the calculation of the $2k$th moment and shifted moments of the Riemann zeta-function on the critical line using long Dirichlet polynomials and divisor correlations. The present paper completes the general study of what we call Type II sums which utilize a circle method framework and a convolution of shifted convolution sums to obtain all of the lower order terms in the asymptotic formula for the mean square along $[T,2T]$ of a Dirichlet polynomial of arbitrary length with divisor functions as coefficients.
description: Revised version; accepted in PLMS
Strong coupling phases of the spin-orbit-coupled spin-1 Bose-Hubbard chain: odd integer Mott lobes and helical magnetic phases
Creators: name: Pixley, J. H.
name: Cole, William S.
name: Spielman, I. B.
name: Rizzi, Matteo
name: Sarma, S. Das
Publisher: name: arXiv
Year: 2017
Subjects: subject: Quantum Gases (cond-mat.quant-gas)
subject: Strongly Correlated Electrons (cond-mat.str-el)
subject: FOS: Physical sciences

description: We study the odd integer filled Mott phases of a spin-1 Bose-Hubbard chain and determine their fate in the presence of a Raman induced spin-orbit coupling which has been achieved in ultracold atomic gases; this system is described by a quantum spin-1 chain with a spiral magnetic field. The spiral magnetic field initially induces helical order with either ferromagnetic or dimer order parameters, giving rise to a spiral paramagnet at large field. The spiral ferromagnet-to-paramagnet phase transition is in a novel universality class, with critical exponents associated with the divergence of the correlation length $ν\approx 2/3$ and the order parameter susceptibility $γ\approx 1/2$. We solve the effective spin model exactly using the density matrix renormalization group, and compare with both a large-$S$ classical solution and a phenomenological Landau theory. We discuss how these exotic bosonic magnetic phases can be produced and probed in ultracold atomic experiments in optical lattices.
description: 15 pages, 14 figures, replaced with published version
Free Boundary Regularity for Almost-Minimizers
Creators: name: David, Guy
name: Engelstein, Max
name: Toro, Tatiana
Publisher: name: arXiv
Year: 2017
Subjects: subject: Analysis of PDEs (math.AP)
subject: FOS: Mathematics
subject: 35R35

description: In this paper we study the free boundary regularity for almost-minimizers of the functional \begin{equation*} J(u)=\int_{\mathcal O} |\nabla u(x)|^2 +q^2_+(x)χ_{\{u>0\}}(x) +q^2_-(x)χ_{\{u<0\}}(x)\ dx \end{equation*} where $q_\pm \in L^\infty(\mathcal O)$. Almost-minimizers satisfy a variational inequality but not a PDE or a monotonicity formula the way minimizers do (see [AC], [ACF], [CJK], [W]). Nevertheless we succeed in proving that, under a non-degeneracy assumption on $q_\pm$, the free boundary is uniformly rectifiable. Furthermore, when $q_-\equiv 0$, and $q_+$ is Hölder continuous we show that the free boundary is almost-everywhere given as the graph of a $C^{1,α}$ function (thus extending the results of [AC] to almost-minimizers).
description: 70 pages. Revised as per referee's comments
Exploring the experiences and perspectives of using mental health apps
Creators: name: Nasiri, Faromarz
Publisher: name: Lancaster University
Year: 2023

description: This thesis presents three papers relating to the qualitative exploration of using mental health smartphone applications (MH apps) through the perspectives of 1) young people, 2) people living with Obsessive Compulsive Disorder (OCD), and 3) a critical appraisal of the research study. Section one presents a literature review of 12 qualitative research papers exploring the experiences and perspectives of young people who have used MH apps. These were analysed through a thematic synthesis approach and three themes were developed: 1) Readily available bite-sized support; 2) Reclaiming agency; 3) Normalisation through connection and anonymity. The findings highlight the perceived value of MH apps in enhancing autonomy for young people and acting as a gateway to mental health support by reducing internal and systemic barriers to mental health support. Section two presents a research study exploring the perspectives and experiences of using MH apps by eight people living with OCD. Semi-structured interviews were conducted with each participant, and the data was analysed using reflexive thematic analysis. Three themes were developed: 1) Finding a way into OCD support; 2) The value of human guidance; and 3) The quandary of connections. Participants described the value of using MH apps to overcome barriers to support, as a way of increasing guided support to engage with challenging OCD outside of therapy and becoming connected to the OCD community. Section three presents a critical appraisal of the research study. The author has reflected upon the research study and literature review findings, exploring areas of commonality and difference. Furthermore, strengths and limitations of the research study are explored, as well as clinical implications and areas of future research, reasons for conducting the study and reflexivity.
Weyl-Kondo Semimetal in Heavy Fermion Systems
Creators: name: Lai, Hsin-Hua
name: Grefe, Sarah E.
name: Paschen, Silke
name: Si, Qimiao
Publisher: name: arXiv
Year: 2016
Subjects: subject: Strongly Correlated Electrons (cond-mat.str-el)
subject: FOS: Physical sciences

description: Insulating states can be topologically nontrivial, a well-established notion that is exemplified by the quantum Hall effect and topological insulators. By contrast, topological metals have not been experimentally evidenced until recently. In systems with strong correlations, they have yet to be identified. Heavy fermion semimetals are a prototype of strongly correlated systems and, given their strong spin-orbit coupling, present a natural setting to make progress. Here we advance a Weyl-Kondo semimetal phase in a periodic Anderson model on a noncentrosymmetric lattice. The quasiparticles near the Weyl nodes develop out of the Kondo effect, as do the surface states that feature Fermi arcs. We determine the key signatures of this phase, which are realized in the heavy fermion semimetal Ce$_3$Bi$_4$Pd$_3$. Our findings provide the much-needed theoretical foundation for the experimental search of topological metals with strong correlations, and open up a new avenue for systematic studies of such quantum phases that naturally entangle multiple degrees of freedom.
description: Final version, PNAS, Early Edition published online on Dec 18, 2017. 5 pages in PNAS format + 4 figures + supplementary information
A Peripheral Canon? The Construction of Lesya Ukrainka as a Soviet-Ukrainian Writer
Creators: name: DZIUB, Nikol
Publisher: name: Zenodo
Year: 2024

description: Working paper for a book chapter

 

Part of the “Gender and Nation in the Biographical Interpretations of Lesya Ukrainka’s Life and Works: Ukraine-Russian Empire-USSR, 1898-2022” Project (Departement Geschichte, Bereich Osteuropäische Geschichte, University of Basel, SNSF Postdoctoral fellowship)
Effect of disorder on transport properties in a tight-binding model for lead halide perovskites
Creators: name: Ashhab, S.
name: Voznyy, O.
name: Hoogland, S.
name: Sargent, E. H.
name: Madjet, M. E.
Publisher: name: arXiv
Year: 2017
Subjects: subject: Materials Science (cond-mat.mtrl-sci)
subject: Other Condensed Matter (cond-mat.other)
subject: FOS: Physical sciences

description: The hybrid organic-inorganic lead halide perovskite materials have emerged as remarkable materials for photovoltaic applications. Their strengths include good electric transport properties in spite of the disorder inherent in them. Motivated by this observation, we analyze the effects of disorder on the energy eigenstates of a tight-binding model of these materials. In particular, we analyze the spatial extension of the energy eigenstates, which is quantified by the inverse participation ratio. This parameter exhibits a tendency, and possibly a phase transition, to localization as the on-site energy disorder strength is increased. However, we argue that the disorder in the lead halide perovskites corresponds to a point in the regime of highly delocalized states. Our results also suggest that the electronic states of mixed-halide materials tend to be more localized than those of pure materials, which suggests a weaker tendency to form extended bonding states in the mixed-halide materials and is therefore not favourable for halide mixing.
description: 24 pages (preprint), 11 figures
The Jacobian Conjecture fails for pseudo-planes
Creators: name: Dubouloz, Adrien
name: Palka, Karol
Publisher: name: arXiv
Year: 2017
Subjects: subject: Algebraic Geometry (math.AG)
subject: Commutative Algebra (math.AC)
subject: Complex Variables (math.CV)
subject: FOS: Mathematics
subject: 14R15, 14R25

description: A smooth complex variety satisfies the Generalized Jacobian Conjecture if all its étale endomorphisms are proper. We study the conjecture for $\mathbb{Q}$-acyclic surfaces of negative Kodaira dimension. We show that $G$-equivariant counterexamples for infinite group $G$ exist if and only if $G=\mathbb{C}^*$ and we classify them relating them to Belyi-Shabat polynomials. Taking universal covers we get rational simply connected $\mathbb{C}^*$-surfaces of negative Kodaira dimension which admit non-proper $\mathbb{C}^*$-equivariant étale endomorphisms. We prove also that for every integers $r\geq 1, k\geq 2$ the $\mathbb{Q}$-acyclic rational hyperplane $u(1+u^{r}v)=w^k$, which has fundamental group $\mathbb{Z}_k$ and negative Kodaira dimension, admits families of non-proper étale endomorphisms of arbitrarily high dimension and degree, whose members remain different after dividing by the action of the automorphism group by left and right composition.
description: 26 pages, 1 figure
On the entropic nature of unified interactions
Creators: name: Dil, Emre
name: Yumak, Tugrul
Publisher: name: arXiv
Year: 2017
Subjects: subject: General Physics (physics.gen-ph)
subject: FOS: Physical sciences

description: In this paper, we generalize Verlinde's entropic gravity proposal on the other fundamental interactions of nature. We begin by introducing the entropic origin of the Coulomb's electrostatic force, and then the magnetic force, by assuming the holographic principle holds when a charged particle approaches a screen enclosing the emerged part of the spacetime due to a source. We assume that the entropy of the screen changes when the charge approaches as in the Verlinde's approach. Thereafter, we obtain the entropic Maxwell equations in both classical and covariant form by means of the holographic principle hold for the source. Considering the gauge covariant structure of the fundamental forces, we implicitly generalize the entropic origin of the electromagnetic force into the strong and weak nuclear forces. The possibility of the entropic origin of the all fundamental forces of nature is assumed to make a meaningful contribution to the unification scheme of the fundamental forces.
Quantifying non-monotonicity of functions and the lack of positivity in signed measures
Creators: name: Davydov, Youri
name: Zitikis, Ričardas
Publisher: name: arXiv
Year: 2017
Subjects: subject: Probability (math.PR)
subject: FOS: Mathematics

description: In various research areas related to decision making, problems and their solutions frequently rely on certain functions being monotonic. In the case of non-monotonic functions, one would then wish to quantify their lack of monotonicity. In this paper we develop a method designed specifically for this task, including quantification of the lack of positivity, negativity, or sign-constancy in signed measures. We note relevant applications in Insurance, Finance, and Economics, and discuss some of them in detail.
description: Published at http://dx.doi.org/10.15559/17-VMSTA84 in the Modern Stochastics: Theory and Applications (https://www.i-journals.org/vtxpp/VMSTA) by VTeX (http://www.vtex.lt/)
Double quantization of Seiberg-Witten geometry and W-algebras
Creators: name: Kimura, Taro
Publisher: name: arXiv
Year: 2016
Subjects: subject: High Energy Physics - Theory (hep-th)
subject: Quantum Algebra (math.QA)
subject: Representation Theory (math.RT)
subject: FOS: Physical sciences
subject: FOS: Mathematics

description: We show that the double quantization of Seiberg-Witten spectral curve for $Γ$-quiver gauge theory defines the generating current of W$(Γ)$-algebra in the free field realization. We also show that the partition function is given as a correlator of the corresponding W$(Γ)$-algebra, which is equivalent to the AGT relation under the gauge/quiver (spectral) duality.
description: 31 pages, contribution to proceedings for 2016 von Neumann Symposium on Topological Recursion and its Influence in Analysis, Geometry, and Topology, 4-8 July 2016, Charlotte, NC; typos corrected, refs. updated
Built-in potential and band alignment of matter
Creators: name: Choe, Duk-Hyun
name: West, Damien
name: Zhang, Shengbai
Publisher: name: arXiv
Year: 2017
Subjects: subject: Materials Science (cond-mat.mtrl-sci)
subject: FOS: Physical sciences

description: The built-in potential is the interfacial potential difference due to electric dipole at the interface of two dissimilar materials. It is of central importance to the understanding of many phenomena in electrochemistry, electrical engineering, and materials science because it determines the band alignment at the interfaces. Despite its importance, its exact sign and magnitude have generally been recognized as an ill-defined quantity for more than half a century. Here, we provide a universal definition of the built-in potential. Furthermore, the built-in potential is explicitly determined by the bulk (i.e., innate) properties of the constituent materials when the system is in electronic equilibrium, while the interface plays a role only in the absence of equilibrium. Our quantitative theory enables a unified description of a variety of important properties in all types of interfaces, ranging from work functions and Schottky barriers in electronic devices to open circuit voltages and electrode potentials in electrochemical cells.
Once-In-A-Century Herbicide - Glyphosate
Creators: name: A.Selva Rani, K.Sivagamy and V.Karunakaran
Publisher: name: trends in Agriculture Science
Year: 2024

description: Glyphosate is a widely used as herbicide, known for its effectiveness in killing weeds and other unwanted plants. It was first synthesized in 1950 by Swiss chemist Henry Martin, but its herbicidal properties were not discovered until 1970 by American chemist John Franz. Since then, glyphosate has become one of the most commonly used herbicides in the world, with applications in agriculture, forestry, and landscaping. The use of glyphosate as a burn down‖ application alone, or in combination with other pre- or post-emergent herbicides, became standard practice in cropping systems throughout the world. Glyphosate is a nonselective, post-emergent herbicide known to control more than 150 weed species, including mono- and dicotyledonous plants of annual or perennial nature. The popularity of glyphosate is due in part to its broad-spectrum activity, meaning it can kill a wide range of plant species.
Game Theory for Multi-Access Edge Computing: Survey, Use Cases, and Future Trends
Creators: name: Moura, Jose
name: Hutchison, David
Publisher: name: arXiv
Year: 2017
Subjects: subject: Computer Science and Game Theory (cs.GT)
subject: Networking and Internet Architecture (cs.NI)
subject: FOS: Computer and information sciences

description: Game Theory (GT) has been used with significant success to formulate, and either design or optimize, the operation of many representative communications and networking scenarios. The games in these scenarios involve, as usual, diverse players with conflicting goals. This paper primarily surveys the literature that has applied theoretical games to wireless networks, emphasizing use cases of upcoming Multi-Access Edge Computing (MEC). MEC is relatively new and offers cloud services at the network periphery, aiming to reduce service latency backhaul load, and enhance relevant operational aspects such as Quality of Experience or security. Our presentation of GT is focused on the major challenges imposed by MEC services over the wireless resources. The survey is divided into classical and evolutionary games. Then, our discussion proceeds to more specific aspects which have a considerable impact on the game usefulness, namely: rational vs. evolving strategies, cooperation among players, available game information, the way the game is played (single turn, repeated), the game model evaluation, and how the model results can be applied for both optimizing resource-constrained resources and balancing diverse trade-offs in real edge networking scenarios. Finally, we reflect on lessons learned, highlighting future trends and research directions for applying theoretical model games in upcoming MEC services, considering both network design issues and usage scenarios.
description: Published in IEEE Communications Surveys & Tutorials, 39 pages, 8 Tables, 11 figures, 278 references
New results on sum-product type growth over fields
Creators: name: Murphy, Brendan
name: Petridis, Giorgis
name: Roche-Newton, Oliver
name: Rudnev, Misha
name: Shkredov, Ilya D.
Publisher: name: arXiv
Year: 2017
Subjects: subject: Combinatorics (math.CO)
subject: Number Theory (math.NT)
subject: FOS: Mathematics
subject: 11B30

description: We prove a range of new sum-product type growth estimates over a general field $\mathbb{F}$, in particular the special case $\mathbb{F}=\mathbb{F}_p$. They are unified by the theme of "breaking the $3/2$ threshold", epitomising the previous state of the art. These estimates stem from specially suited applications of incidence bounds over $\mathbb{F}$, which apply to higher moments of representation functions. We establish the estimate $|R[A]| \gtrsim |A|^{8/5}$ for cardinality of the set $R[A]$ of distinct cross-ratios defined by triples of elements of a (sufficiently small if $\mathbb{F}$ has positive characteristic, similarly for the rest of the estimates) set $A\subset \mathbb{F}$, pinned at infinity. The cross-ratio naturally arises in various sum-product type questions of projective nature and is the unifying concept underlying most of our results. It enables one to take advantage of its symmetry properties as an onset of growth of, for instance, products of difference sets. The geometric nature of the cross-ratio enables us to break the version of the above threshold for the minimum number of distinct triangle areas $Ouu'$, defined by points $u,u'$ of a non-collinear point set $P\subset \mathbb{F}^2$. Another instance of breaking the threshold is showing that if $A$ is sufficiently small and has additive doubling constant $M$, then $|AA|\gtrsim M^{-2}|A|^{14/9}$. This result has a second moment version, which allows for new upper bounds for the number of collinear point triples in the set $A\times A\subset \mathbb{F}^2$, the quantity often arising in applications of geometric incidence estimates.
description: 59 pages. Added Theorem 2 and improved Theorem 1. This version is different to the one in print
ADSORPTION OF Cd(II) AND Pb(II) IONS FROM AQUEOUS SOLUTION USING UNMODIFIED AND MODIFIED ADSORBENTS PREPARED FROM DESERT DATE PEELS (Balanites aegyptiaca)
Creators: name: Alkali, Mamman Ibrahim
name: Abdus-Salam, Nasir
name: Abdullahi, Musa Rabiu
name: Ville, Esther
name: Dikwa, Mohammed Kyari
Publisher: name: JSR Unimaid
Year: 2024

description: ABSTRACT

The problem of poor or non-treatment of wastewater is often attributed to high cost of purification methods in our industries. Therefore, there is the need to provide alternative adsorbent of comparative effectiveness but develop from agro-based waste. The purpose of this research was to provide understanding of the mechanisms for the adsorption of Cd(II) and Pb(II) ions from aqueous solutions onto Desert Date peels as adsorbent. This was done through characterization and optimum adsorption conditions of Unmodified and Modified Desert Date Peels (UDD and MDD). A 3 M ZnCl2 was used for the modification of the desert date peel. The results for Fourier-Transform Infrared Spectroscopy (FTIR) of UDD and MDD spectra show broad band peak at 3448.84 cm-1 and 3414.12 cm-1 which corresponds to O-H stretching mode of hydroxyl groups on the surface of the activated carbon. The maximum adsorption capacity of Cd(II) and Pb(II) ions onto UDD and MDD are 94.06 and 80.56 mg/g being observed within 60 min. The adsorption isotherm study ascertains a good correlation coefficient which Langmuir isotherm fitted well into UDD and MDD with (R2) values 0.9893 and 0.9668 and UDD obeyed pseudo second order kinetics model. Thermodynamic studies revealed that the adsorption system was feasible, non-spontaneous and endothermic 6.684 and 8.675 kJ/mol for Cd(II) and Pb(II) ions respectively. The results showed that, both UDD and MDD have the potentials to be applied as alternative low-cost adsorbents in the remediation of heavy metal ions from aqueous solution.

Keywords: Adsorption; Kinetics; Isotherms; Desert Date peels; Thermodynamics
Heralded quantum steering over a high-loss channel
Creators: name: Weston, Morgan M.
name: Slussarenko, Sergei
name: Chrzanowski, Helen M.
name: Wollmann, Sabine
name: Shalm, Lynden K.
name: Verma, Varun B.
name: Allman, Michael S.
name: Nam, Sae Woo
name: Pryde, Geoff J.
Publisher: name: arXiv
Year: 2016
Subjects: subject: Quantum Physics (quant-ph)
subject: FOS: Physical sciences

description: Entanglement is the key resource for many long-range quantum information tasks, including secure communication and fundamental tests of quantum physics. These tasks require robust verification of shared entanglement, but performing it over long distances is presently technologically intractable because the loss through an optical fiber or free-space channel opens up a detection loophole. We design and experimentally demonstrate a scheme that verifies entanglement in the presence of at least $14.8\pm0.1$ dB of added loss, equivalent to approximately $80$ km of telecommunication fiber. Our protocol relies on entanglement swapping to herald the presence of a photon after the lossy channel, enabling event-ready implementation of quantum steering. This result overcomes the key barrier in device-independent communication under realistic high-loss scenarios and in the realization of a quantum repeater.
description: 8 pages, 5 figures
Muslim Brotherhood online religion: a content study of Ikhwantube using Digital Humanities tools
Creators: name: Van Heesvelde, Hanna
Publisher: name: Zenodo
Year: 2023
Subjects: Muslim Brotherhood
Religion
Online religion
AI transcription

description: The transcription of Arabic audiovisual fragments to raw text files is no evident task. This abstract presents the task of transcribing Arabic video files to text within the framework of a project analyzing the religious content of the Muslim Brotherhood on their own videoplatform Ikhwantube.
Adoption de SIG pour le suivi de la morphologie fluviale de l'Oued Sebou en aval de Fès (Pré-Rif, Maroc)
Creators: name: Mohammed YAZAMI ZTAIT
Publisher: name: Zenodo
Year: 2024

description: Pour bien comprendre l’état d'un cours d'eau et ses unités fonctionnelles, il est indispensable de déterminer leurs caractéristiques morphologiques. Notre zone d'étude est située dans le moyen Sebou en aval de Fès, entre la confluence de l'oued Fès Avec oued Sebou et la confluence de l'oued Inaouene avec oued Sebou.

Les paramètres, morphologiques, morphométriques et morphodynamiques de ce tronçon varient d'un endroit à l'autre, cette partie est exposée à une dynamique fluviale important, ce qui conduit au développement et au changement de sa morphologie à court et à long terme.

L'objectif de cette étude est de connaître l'état de la morphologie du moyen Sebou et son évolution entre la zone haute et la zone basse, en tentant de révéler les caractéristiques géomorphologiques du cours d’eau.
Cooperative Multi-Sender Index Coding
Creators: name: Li, Min
name: Ong, Lawrence
name: Johnson, Sarah J.
Publisher: name: arXiv
Year: 2017
Subjects: subject: Information Theory (cs.IT)
subject: FOS: Computer and information sciences

description: In this paper, we propose a new coding scheme and establish new bounds on the capacity region for the multi-sender unicast index-coding problem. We revisit existing partitioned Distributed Composite Coding (DCC) proposed by Sadeghi et al. and identify its limitations in the implementation of multi-sender composite coding and in the strategy of sender partitioning. We then propose two new coding components to overcome these limitations and develop a multi-sender Cooperative Composite Coding (CCC). We show that CCC can strictly improve upon partitioned DCC, and is the key to achieve optimality for a number of index-coding instances. The usefulness of CCC and its special cases is illuminated via non-trivial examples, and the capacity region is established for each example. Comparisons between CCC and other non-cooperative schemes in recent works are also provided to further demonstrate the advantage of CCC.
description: Author final manuscript (accepted and to appear in IEEE Transactions on Information Theory, August 2018.)
Understanding Data Anonymization
Creators: name: Thompson, Kristi
Publisher: name: Zenodo
Year: 2023
Subjects: anonymization
data sharing
identifiers

description: Data curators should have a basic understanding of data anonymization so they can support safe sharing of sensitive data and avoid sharing data that accidentally violates confidentiality. This workshop will consist of a lecture followed by an interactive hands-on session using R. The first half will cover the mathematical and theoretical underpinnings of guaranteed data anonymization. Topics covered include an overview of identifiers and quasi-identifiers, an introduction to k-anonymity, a look at some cases where k-anonymity breaks down, and a discussion of various enhancements of k-anonymity.

 The second half will walk participants through some steps to assess the disclosure risk of a dataset and anonymize it using R and the R package SDCMicro.

 Much of the academic material looking at data anonymization is quite abstract and aimed at computer scientists, while material aimed at data curators does not always consider recent developments. This session is intended to help bridge the gap.
Theta, Time Reversal, and Temperature
Creators: name: Gaiotto, Davide
name: Kapustin, Anton
name: Komargodski, Zohar
name: Seiberg, Nathan
Publisher: name: arXiv
Year: 2017
Subjects: subject: High Energy Physics - Theory (hep-th)
subject: High Energy Physics - Lattice (hep-lat)
subject: High Energy Physics - Phenomenology (hep-ph)
subject: FOS: Physical sciences

description: $SU(N)$ gauge theory is time reversal invariant at $θ=0$ and $θ=π$. We show that at $θ=π$ there is a discrete 't Hooft anomaly involving time reversal and the center symmetry. This anomaly leads to constraints on the vacua of the theory. It follows that at $θ=π$ the vacuum cannot be a trivial non-degenerate gapped state. (By contrast, the vacuum at $θ=0$ is gapped, non-degenerate, and trivial.) Due to the anomaly, the theory admits nontrivial domain walls supporting lower-dimensional theories. Depending on the nature of the vacuum at $θ=π$, several phase diagrams are possible. Assuming area law for space-like loops, one arrives at an inequality involving the temperatures at which CP and the center symmetry are restored. We also analyze alternative scenarios for $SU(2)$ gauge theory. The underlying symmetry at $θ=π$ is the dihedral group of 8 elements. If deconfined loops are allowed, one can have two $O(2)$-symmetric fixed points. It may also be that the four-dimensional theory around $θ=π$ is gapless, e.g. a Coulomb phase could match the underlying anomalies.
description: 62 pages, 9 figures, important typos fixed, added comments
Understanding trained CNNs by indexing neuron selectivity
Creators: name: Rafegas, Ivet
name: Vanrell, Maria
name: Alexandre, Luis A.
name: Arias, Guillem
Publisher: name: arXiv
Year: 2017
Subjects: subject: Computer Vision and Pattern Recognition (cs.CV)
subject: FOS: Computer and information sciences

description: The impressive performance of Convolutional Neural Networks (CNNs) when solving different vision problems is shadowed by their black-box nature and our consequent lack of understanding of the representations they build and how these representations are organized. To help understanding these issues, we propose to describe the activity of individual neurons by their Neuron Feature visualization and quantify their inherent selectivity with two specific properties. We explore selectivity indexes for: an image feature (color); and an image label (class membership). Our contribution is a framework to seek or classify neurons by indexing on these selectivity properties. It helps to find color selective neurons, such as a red-mushroom neuron in layer Conv4 or class selective neurons such as dog-face neurons in layer Conv5 in VGG-M, and establishes a methodology to derive other selectivity properties. Indexing on neuron selectivity can statistically draw how features and classes are represented through layers in a moment when the size of trained nets is growing and automatic tools to index neurons can be helpful.
description: Under review on Pattern Recognition Letters
A Constituição de ontem e de hoje. O que nos reserva o futuro? Os 400 anos das Leis Fundamentais do Maranhão * 1. Introdução:
Creators: name: Santana, José Cláudio Pavão
Publisher: name: Zenodo
Year: 2012
Subjects: CONTITUCIONALISMO
CONSTITUIÇÃO NATURAL
LEIS FUNDAMENTAIS
MARANHÃO

description: 1. Introdução. 2. Entre a definição e o conceito. 3. O Constitucionalismo. 4. As Leis Fundamentais do Maranhão. 5. Constituição: Natureza jurídica. Constituição Federal ou Constituição da República? 6. A Assembleia Nacional Constituinte e as decisões políticas estruturantes. 7. Estática e dinâmica: oxigenação constitucional. Omissão legislativa. Ativismo jurídico. Legislador negativo. Difusão de controle e insegurança. 8. O que nos reserva o futuro? Cláusula de abertura e releitura constitucional. Mutação, instabilidade e sentimento constitucional. 9. Conclusões.
Colourings without monochromatic disjoint pairs
Creators: name: Clemens, Dennis
name: Das, Shagnik
name: Tran, Tuan
Publisher: name: arXiv
Year: 2016
Subjects: subject: Combinatorics (math.CO)
subject: FOS: Mathematics
subject: 05D05

description: The typical extremal problem asks how large a structure can be without containing a forbidden substructure. The Erdős-Rothschild problem, introduced in 1974 by Erdős and Rothschild in the context of extremal graph theory, is a coloured extension, asking for the maximum number of colourings a structure can have that avoid monochromatic copies of the forbidden substructure. The celebrated Erdős-Ko-Rado theorem is a fundamental result in extremal set theory, bounding the size of set families without a pair of disjoint sets, and has since been extended to several other discrete settings. The Erdős-Rothschild extensions of these theorems have also been studied in recent years, most notably by Hoppen, Koyakayawa and Lefmann for set families, and Hoppen, Lefmann and Odermann for vector spaces. In this paper we present a unified approach to the Erdős-Rothschild problem for intersecting structures, which allows us to extend the previous results, often with sharp bounds on the size of the ground set in terms of the other parameters. In many cases we also characterise which families of vector spaces asymptotically maximise the number of Erdős-Rothschild colourings, thus addressing a conjecture of Hoppen, Lefmann and Odermann.
description: 31 pages