cometadata/datacite-rtg-text-other-reclassification-records huggingface dataset:
Katrin Jordan, Ausgestrahlt. Die mediale Debatte um »Tschernobyl« in der Bundesrepublik und in Frankreich 1986/87, Göttingen (Wallstein) 2018
Creators: name: Von Oppeln, Sabine
Publisher: name: Francia-Recensio
Year: 2020

description: Katrin Jordan, Ausgestrahlt. Die mediale Debatte um »Tschernobyl« in der Bundesrepublik und in Frankreich 1986/87, Göttingen (Wallstein) 2018, 424 S., 22 Abb. (Medien und Gesellschaftswandel im 20. Jahrhundert, 10), ISBN 978-3-8353-3304-8, EUR 42,00.
description: Francia-Recensio, 2020/2
Axel Schildt, Wolfgang Schmidt (Hg.), »Wir wollen mehr Demokratie wagen«. Antriebskräfte, Realität und Mythos eines Versprechens, Bonn (Dietz) 2019
Creators: name: Genevois, Julien
Publisher: name: Francia-Recensio
Year: 2020

description: Axel Schildt, Wolfgang Schmidt (Hg.), »Wir wollen mehr Demokratie wagen«. Antriebskräfte, Realität und Mythos eines Versprechens, Bonn (Dietz) 2019, 292 S., 1 Abb. (Willy-Brandt-Studien, 6), ISBN 978-3-8012-0549-2, EUR 32,00.
description: Francia-Recensio, 2020/2
Flower-promotive cultural treatments in Picea glauca: their effect on flowering, shoot elongation, endogenous gibberellin levels and gibberellin metabolism
Creators: name: Wilson, Sherry M.
Publisher: name: University of Calgary
Year: 1987
Subjects: subject: QK 494.5 P66 W54 1987
subject: White spruce
subject: Plant regulators
subject: Plants, Effect of gibberellins on
subject: Plants, flowering of
subject: Gibberellins
subject: Plants - Metabolism

description: Bibliography: p. 172-180.
Shortcuts to adiabaticity: fast-forward approach
Creators: name: Torrontegui, E.
name: Martínez-Garaot, S.
name: Ruschhaupt, A.
name: Muga, J. G.
Publisher: name: arXiv
Year: 2012
Subjects: subject: Quantum Physics (quant-ph)
subject: FOS: Physical sciences

description: The "fast-forward" approach by Masuda and Nakamura generates driving potentials to accelerate slow quantum adiabatic dynamics. First we present a streamlined version of the formalism that produces the main results in a few steps. Then we show the connection between this approach and inverse engineering based on Lewis-Riesenfeld invariants. We identify in this manner applications in which the engineered potential does not depend on the initial state. Finally we discuss more general applications exemplified by wave splitting processes.
description: 7 pages, 3 figures
Intrinsic first- and higher-order topological superconductivity in a doped topological insulator
Creators: name: Scammell, Harley D.
name: Ingham, Julian
name: Geier, Max
name: Li, Tommy
Publisher: name: Freie Universität Berlin
Year: 2022
Subjects: subject: Spin-orbit coupling
subject: Superconductivity
subject: Symmetry protected topological states
subject: Topological insulators
subject: Topological superconductors
subject: Semiconductors
subject: Topological materials
subject: Unconventional superconductors
subject: Bogoliubov-de Gennes equations
subject: Electron-correlation calculations
subject: 500 Naturwissenschaften und Mathematik::530 Physik::539 Moderne Physik

description: We explore higher-order topological superconductivity in an artificial Dirac material with intrinsic spin-orbit coupling, which is a doped Z2 topological insulator in the normal state. A mechanism for superconductivity due to repulsive interactions, pseudospin pairing, has recently been shown to naturally result in higher-order topology in Dirac systems past a minimum chemical potential [T. Li et al., 2D Mater. 9, 015031 (2022)]. Here we apply this theory through microscopic modeling of a superlattice potential imposed on an inversion-symmetric hole-doped semiconductor heterostructure, known as hole-based semiconductor artificial graphene, and extend previous work to include the effects of spin-orbit coupling. We find that spin-orbit coupling enhances interaction effects, providing an experimental handle to increase the efficiency of the superconducting mechanism. We show that the phase diagram of these systems, as a function of chemical potential and interaction strength, contains three superconducting states: a first-order topological p+ip state, a second-order topological spatially modulated p+iτp state, and a second-order topological extended s-wave state sτ. We calculate the symmetry-based indicators for the p+iτp and sτ states, which prove these states possess second-order topology. Exact diagonalization results are presented which illustrate the interplay between the boundary physics and spin-orbit interaction. We argue that this class of systems offers an experimental platform to engineer and explore first- and higher-order topological superconducting states.
Bridging atomistic spin dynamics methods and phenomenological models of single-pulse ultrafast switching in ferrimagnets
Creators: name: Jakobs, Florian
name: Atxitia, Unai
Publisher: name: Freie Universität Berlin
Year: 2022
Subjects: subject: Magnetism
subject: Magnetization switching
subject: Micromagnetism
subject: Spin dynamics
subject: Ultrafast magnetic effects
subject: Ultrafast magnetization dynamics
subject: Ferrimagnets
subject: 500 Naturwissenschaften und Mathematik::530 Physik::538 Magnetismus

description: We bridge an essential knowledge gap on the understanding of all-optical ultrafast switching in ferrimagnets, namely, the connection between atomistic spin dynamics methods and macroscopic phenomenological models. All-optical switching of the magnetization occurs after the application of a single femtosecond laser pulse to specific ferrimagnetic compounds. This strong excitation puts the involved degrees of freedom, electrons, lattice, and spins out-of-equilibrium between each other. Atomistic spin models have quantitatively described all-optical switching in a wide range of experimental conditions, while having failed to provide a simple picture of the switching process. Phenomenological models are able to qualitatively describe the dynamics of the switching process. However, a unified theoretical framework is missing that describes the element-specific spin dynamics as atomistic spin models with the simplicity of phenomenology. Here, we bridge this gap and present an element-specific macrospin dynamical model which fully agrees with atomistic spin dynamics simulations and symmetry considerations of the phenomenological models.
Higher-order topological semimetals and nodal superconductors with an order-two crystalline symmetry
Creators: name: Simon, Sophia
name: Geier, Max
name: Brouwer, Piet W.
Publisher: name: Freie Universität Berlin
Year: 2022
Subjects: subject: Edge states
subject: Electronic structure
subject: Topological insulators
subject: Topological materials
subject: Topological phases of matter
subject: Topological superconductors
subject: 500 Naturwissenschaften und Mathematik::530 Physik::539 Moderne Physik

description: Using a systematic relation between topological gapless phases in three dimensions and topological gapped phases in two dimensions, we identify four types of higher-order topological semimetals or nodal superconductors (HOTS), hosting (i) flat zero-energy “Fermi arcs” at crystal hinges, (ii) flat zero-energy hinge arcs coexisting with surface Dirac cones, (iii) chiral or helical hinge modes, or (iv) flat zero-energy hinge arcs connecting nodes only at finite momentum. Bulk-boundary correspondence relates the hinge states to the bulk topology protecting the nodal point or loop. We classify all HOTS for all tenfold-way classes with an order-two crystalline (anti)symmetry, such as mirror, twofold rotation, or inversion.
Contact angles on a soft solid: from Young's law to Neumann's law
Creators: name: Marchand, Antonin
name: Das, Siddhartha
name: Snoeijer, Jacco H.
name: Andreotti, Bruno
Publisher: name: arXiv
Year: 2012
Subjects: subject: Fluid Dynamics (physics.flu-dyn)
subject: FOS: Physical sciences

description: The contact angle that a liquid drop makes on a soft substrate does not obey the classical Young's relation, since the solid is deformed elastically by the action of the capillary forces. The finite elasticity of the solid also renders the contact angles different from that predicted by Neumann's law, which applies when the drop is floating on another liquid. Here we derive an elasto-capillary model for contact angles on a soft solid, by coupling a mean-field model for the molecular interactions to elasticity. We demonstrate that the limit of vanishing elastic modulus yields Neumann's law or a slight variation thereof, depending on the force transmission in the solid surface layer. The change in contact angle from the rigid limit (Young) to the soft limit (Neumann) appears when the length scale defined by the ratio of surface tension to elastic modulus $γ/E$ reaches a few molecular sizes.
Seismic diagnostics for rotating massive main sequence stars
Creators: name: Goupil, Mariejo
Publisher: name: arXiv
Year: 2011
Subjects: subject: Solar and Stellar Astrophysics (astro-ph.SR)
subject: FOS: Physical sciences

description: Effects of stellar rotation on adiabatic oscillation frequencies of $β$ Cephei star are discussed. Methods to evaluate them are briefly described and some of the main results for four specific stars are presented.
description: 36 pages, 11 figures
Formation and dissolution of leaky clusters
Creators: name: Pfalzner, S.
Publisher: name: arXiv
Year: 2011
Subjects: subject: Solar and Stellar Astrophysics (astro-ph.SR)
subject: Earth and Planetary Astrophysics (astro-ph.EP)
subject: FOS: Physical sciences

description: Massive Galactic clusters (> 1000 Msun) exhibit a clear correlation between cluster density, size and age and can be sorted in two categories, i.e. starburst and leaky clusters. The reason for the existance of two types of massive clusters is an open question. However, the answer is probably connected to a different formation histories of the two types. In this study we concentrate onleaky clusters only and investigate possible formation scenarios and gas expulsion phase. This is done by using existing observational data and numerical results of embedded cluster properties. Assuming that a clear correlation between cluster density, size and age exists, it is shown that the density-radius development over time forembedded clusters can be approximated by rho \approx 100*r ^{-1.3} Msun pc^{-3}. The consequences for the star formation process in leaky clusters are discussed and found to favour an inside-out star formation scenario with an initially low but later accelerated star formation rate. It is shown how the leaky clusters form in a unique sequential manner and that rapid gas expulsion is responsible for the 80-90\% mass loss over the next 20 Myr.
description: 7 pages, 4 figures, accepted by A&A
Finite-frequency spin conductance of the interface between a ferro- or ferrimagnetic insulator and a normal metal
Creators: name: Reiss, David A.
name: Brouwer, Piet W.
Publisher: name: Freie Universität Berlin
Year: 2022
Subjects: subject: MagnetotransportSpin current
subject: Magnons
subject: Spin Hall magnetoresistance
subject: Spin Seebeck effect
subject: Spin waves
subject: Thermomagnetic effects
subject: Ultrafast magnetic effects
subject: 500 Naturwissenschaften und Mathematik::530 Physik::539 Moderne Physik

description: The interface between a ferro- or ferrimagnetic insulator and a normal metal can support spin currents polarized collinear with and perpendicular to the magnetization direction. The flow of angular momentum perpendicular to the magnetization direction (“transverse” spin current) takes place via spin torque and spin pumping. The flow of angular momentum collinear with the magnetization (“longitudinal” spin current) requires the excitation of magnons. In this article we extend the existing theory of longitudinal spin transport [Bender and Tserkovnyak, Phys. Rev. B 91, 140402(R) (2015)] in the zero-frequency weak-coupling limit in two directions: We calculate the longitudinal spin conductance nonperturbatively (but in the low-frequency limit) and at finite frequency (but in the limit of low interface transparency). For the paradigmatic spintronic material system YIG|Pt, we find that nonperturbative effects lead to a longitudinal spin conductance that is ca. 40% smaller than the perturbative limit, whereas finite-frequency corrections are relevant at low temperatures ≲100K only, when only few magnon modes are thermally occupied.
Phonon-limited transport and Fermi arc lifetime in Weyl semimetals
Creators: name: Buccheri, Francesco
name: De Martino, Alessandro
name: Pereira, Rodrigo G.
name: Brouwer, Piet W.
name: Egger, Reinhold
Publisher: name: Freie Universität Berlin
Year: 2022
Subjects: subject: Electron-phonon coupling
subject: Surface states
subject: Weyl semimetal
subject: Boltzmann theory
subject: 500 Naturwissenschaften und Mathematik::530 Physik::539 Moderne Physik

description: Weyl semimetals harbor topological Fermi arc surface states that determine the nontrivial charge current response to external fields. We study here the quasiparticle decay rate of Fermi arc states arising from their coupling to acoustic phonons, as well as the phonon-limited conductivity tensor for a clean Weyl semimetal slab. Using the phonon modes for an isotropic elastic continuum with a deformation potential coupling to electrons, we determine the temperature dependence of the quasiparticle decay rate, both near and far away from the arc termination points. By solving the coupled Boltzmann equations for the bulk and arc state distribution functions in the slab geometry, we show how the linear-response conductivity depends on key parameters such as the temperature, the chemical potential, the geometric shape of the Fermi arcs, or the slab width. The chiral nature of Fermi arc states causes an enhancement of the longitudinal conductivity along the chiral direction at low temperatures, together with a 1/T2 scaling regime at intermediate temperatures without counterpart for the conductivity along the perpendicular direction.
Thermal spin dynamics of Kitaev magnets: Scattering continua and magnetic field induced phases within a stochastic semiclassical approach
Creators: name: Franke, Oliver
name: Călugăru, Dumitru
name: Nunnenkamp, Andreas
name: Knolle, Johannes
Publisher: name: Freie Universität Berlin
Year: 2022
Subjects: subject: Frustrated magnetism
subject: Magnetic interactions
subject: Magnetic order
subject: Magnetic phase transitions
subject: Magnetization dynamics
subject: Magnons
subject: Quantum spin liquid
subject: Spin dynamics
subject: Spin liquid
subject: Spin-phonon coupling
subject: Topological phases of matter
subject: Honeycomb lattice
subject: Landau-Lifschitz-Gilbert equation
subject: Landau-Lifshitz model
subject: 500 Naturwissenschaften und Mathematik::530 Physik::539 Moderne Physik

description: The honeycomb magnet α−RuCl3 is a prime candidate material for realizing the Kitaev quantum spin liquid (QSL), but it shows long-range magnetic order at low temperature. Nevertheless, its broad inelastic neutron scattering (INS) response at finite frequency has been interpreted as that of a “proximate QSL.” A moderate in-plane magnetic field indeed melts the residual zigzag order, giving rise to peculiar intermediate-field phases before the high-field polarized state. In INS measurements the low-frequency spin waves disappear, leading to a broad scattering continuum in the field-induced intermediate regime, whose nature is currently under debate. Here, we study the magnetic-field-dependent spin dynamics of the K−Γ−Γ′ model within a stochastic semiclassical treatment, which incorporates the effect of finite-temperature fluctuations. At temperatures relevant for INS experiments, we show how the excitations of the zigzag phase broaden and that the different intermediate phases all show a similar continuum response. We discuss the implications of our results for experiments and highlight the importance of distinguishing finite-temperature fluctuations from genuine quantum fractionalization signatures in frustrated magnets.
A new effective interaction for the trapped fermi gas: the BEC-BCS crossover
Creators: name: Gilbreth, C. N.
name: Alhassid, Y.
Publisher: name: arXiv
Year: 2011
Subjects: subject: Quantum Gases (cond-mat.quant-gas)
subject: Nuclear Theory (nucl-th)
subject: Atomic Physics (physics.atom-ph)
subject: FOS: Physical sciences

description: We extend a recently introduced separable interaction for the unitary trapped Fermi gas to all values of the scattering length. We derive closed expressions for the interaction matrix elements and the two-particle eigenvectors and analytically demonstrate the convergence of this interaction to the zero-range two-body pseudopotential for s-wave scattering. We apply this effective interaction to the three- and four-particle systems along the BEC-BCS crossover, and find that their low-lying energies exhibit convergence in the regularization parameter that is much faster than for the conventional renormalized contact interaction. We find similar convergence properties of the three-particle free energy at unitarity.
description: 10 pages, 7 figures
Quantum phase-space analysis of population equilibration in multi-well ultracold atomic systems
Creators: name: Chianca, C. V.
name: Olsen, M. K.
Publisher: name: arXiv
Year: 2011
Subjects: subject: Quantum Gases (cond-mat.quant-gas)
subject: FOS: Physical sciences

description: We examine the medium time quantum dynamics and population equilibration of two, three and four-well Bose-Hubbard models using stochastic integration in the truncated Wigner phase-space representation. We find that all three systems will enter at least a temporary state of equilibrium, with the details depending on both the classical initial conditions and the initial quantum statistics. We find that classical integrability is not necessarily a good guide as to whether equilibration will occur. We construct an effective single-particle reduced density matrix for each of the systems, using the expectation values of operator moments, and use this to calculate an effective entropy. Knowing the expected maximum values of this entropy for each system, we are able to quantify the different approaches to equilibrium.
description: 16 pages, 7 figures
Constraining fundamental constant evolution with HI and OH lines
Creators: name: Kanekar, N.
name: Langston, G. I.
name: Stocke, J. T.
name: Carilli, C. L.
name: Menten, K. L.
Publisher: name: arXiv
Year: 2012
Subjects: subject: Cosmology and Nongalactic Astrophysics (astro-ph.CO)
subject: General Relativity and Quantum Cosmology (gr-qc)
subject: High Energy Physics - Experiment (hep-ex)
subject: FOS: Physical sciences

description: We report deep Green Bank Telescope spectroscopy in the redshifted HI 21cm and OH 18cm lines from the $z = 0.765$ absorption system towards PMN J0134-0931. A comparison between the "satellite" OH 18cm line redshifts, or between the redshifts of the HI 21cm and "main" OH 18cm lines, is sensitive to changes in different combinations of three fundamental constants, the fine structure constant $α$, the proton-electron mass ratio $μ\equiv m_p/m_e$ and the proton g-factor $g_p$. We find that the satellite OH 18cm lines are not perfectly conjugate, with both different line shapes and stronger 1612 MHz absorption than 1720 MHz emission. This implies that the satellite lines of this absorber are not suitable to probe fundamental constant evolution. A comparison between the redshifts of the HI 21cm and OH 18cm lines, via a multi-Gaussian fit, yields the strong constraint $[ΔF/F] = [-5.2 \pm 4.3] \times 10^{-6}$, where $F \equiv g_p [μα^2]^{1.57}$ and the error budget includes contributions from both statistical and systematic errors. We thus find no evidence for a change in the constants between $z = 0.765$ and the present epoch. Incorporating the constraint $[Δμ/μ] < 3.6 \times 10^{-7}$ from another absorber at a similar redshift and assuming that fractional changes in $g_p$ are much smaller than those in $α$, we obtain $[Δα/α] = (-1.7 \pm 1.4) \times 10^{-6}$ over a lookback time of 6.7 Gyrs.
description: 5 pages, 4 figures; accepted for publication in Astrophysical Journal Letters
Dimensional crossover of thermal conductance in graphene nanoribbons: A first-principles approach
Creators: name: Wang, Jian
name: Wang, Xiao-Ming
name: Chen, Yun-Fei
name: Wang, Jian-Sheng
Publisher: name: arXiv
Year: 2012
Subjects: subject: Mesoscale and Nanoscale Physics (cond-mat.mes-hall)
subject: Statistical Mechanics (cond-mat.stat-mech)
subject: FOS: Physical sciences

description: First-principles density-functional calculations are performed to investigate the thermal transport properties in graphene nanoribbons (GNRs). The dimensional crossover of thermal conductance from one to two dimensions (2D) is clearly demonstrated with increasing ribbon width. The thermal conductance of GNRs in a few nanometer width already exhibits an approximate low-temperature dependence of $T^{1.5}$, like that of 2D graphene sheet which is attributed to the quadratic nature of dispersion relation for the out-of-plane acoustic phonon modes. Using a zone-folding method, we heuristically derive the dimensional crossover of thermal conductance with the increase of ribbon width. Combining our calculations with the experimental phonon mean-free path, some typical values of thermal conductivity at room temperature are estimated for GNRs and for 2D graphene sheet, respectively. Our findings clarify the issue of low-temperature dependence of thermal transport in GNRs and suggest a calibration range of thermal conductivity for experimental measurements in graphene-based materials.
description: 18 pages, 4 figures
A semilinear problem with a W^{1,1}_0 solution
Creators: name: Boccardo, Lucio
name: Croce, Gisella
name: Orsina, Luigi
Publisher: name: arXiv
Year: 2012
Subjects: subject: Analysis of PDEs (math.AP)
subject: FOS: Mathematics

description: We study a degenerate elliptic equation, proving the existence of a W^{1,1}_0 distributional solution.
REPOSITORIO DE DATOS ACADÉMICOS RDA-UNR
Creators: name: , Bongiovani
name: , Salazar
name: , Freán
Publisher: name: Zenodo
Year: 2023
Subjects: Programa de Acceso Global
Ciencia Abierta
Identificadores Persistentes
PIDs
Infraestructuras abiertas
Repositorio de Datos
Redes de Repositorios
DataCite
Latinoamérica
Global Access Program

description: En el marco del Global Access Program (GAP), y tras el éxito de los eventos presenciales "DataCite Connect Buenos Aires" y "Identificadores Persistentes (PIDs) y Ciencia Abierta en América Latina" continuamos difundiendo la importancia, los beneficios y casos de éxito de la adopción de Identificadores Persistentes en la región.

 El GAP es la iniciativa de DataCite para mejorar el acceso equitativo a nuestros servicios de infraestructura abierta, asegurando que investigadores y organizaciones de investigación de todo el mundo, incluyendo Latino América, tengan la oportunidad de beneficiarse del uso de identificadores persistentes y metadatos.

 DataCite les invita a unirse a este webinar, en el que aprenderán sobre:
 - El Programa de Acceso Global (GAP) de DataCite para Latinoamérica.
 - Los conceptos básicos sobre los identificadores persistentes (PIDs), como el DOI, y su importancia para la visibilidad y citación de los datos en el contexto de la investigación en Latinoamérica.
 - La experiencia del Repositorio de Datos Académicos de la Universidad Nacional de Rosario en Argentina y sus prácticas para gestionar datos de investigación. En esta presentación, el equipo detrás del Repositorio de Datos Académicos de la Unidad Nacional de Rosario en Argentina nos comparte cómo han integrado los identificadores persistentes (PIDs) en el ecosistema de su repositorio y testimonio de sus investigadores. Puede encontrar una grabación de su charla aquí: https://www.youtube.com/watch?v=e89OHOg-zes&t=1428s
Electronic properties, doping and defects in chlorinated silicon nanocrystals
Creators: name: Carvalho, A.
name: Öberg, S.
name: Rayson, M. J.
name: Briddon, P. R.
Publisher: name: arXiv
Year: 2011
Subjects: subject: Mesoscale and Nanoscale Physics (cond-mat.mes-hall)
subject: FOS: Physical sciences

description: Silicon nanocrystals with diameters between 1 and 3 nm and surfaces passivated by chlorine or a mixture of chlorine and hydrogen were modeled using density functional theory, and their properties compared with those of fully hydrogenated nanocrystals. It is found that fully and partially chlorinated nanocrystals are stable, and have higher electron affinity, higher ionization energy and lower optical absorption energy threshold. As the hydrogenated silicon nanocrystals, chlorinated silicon nanocrystals doped with phosphorus or boron require a high activation energy to transfer an electron or hole, respectively, to undoped silicon nanocrystals. The electronic levels of surface dangling bonds are similar for both types of surface passivation, although in the chlorinated silicon nanocrystals some fall outside the narrower energy gap.
Nested Fermi surfaces and correlated electronic phases in hole-doped semiconductor quantum wells
Creators: name: Li, Tommy
name: Ingham, Julian
name: Scammell, Harley D.
Publisher: name: Freie Universität Berlin
Year: 2022
Subjects: subject: Antiferromagnetism
subject: Charge order
subject: Fermi surface
subject: Spin-orbit coupling
subject: Stripes
subject: Renormalization group
subject: 500 Naturwissenschaften und Mathematik::530 Physik::539 Moderne Physik

description: We demonstrate the existence of novel interaction effects in hole-doped semiconductor quantum wells which are connected to dramatic changes in the Fermi surface geometry occurring upon variation of the doping. We present band structure calculations showing that quantum wells formed in p-type cubic semiconductors develop perfectly nested Fermi surfaces at a critical hole density p∼1/d2 set by the width d of the quantum well. Nesting gives rise to competing superconducting and charge or spin density wave order, which we analyze using the perturbative renormalization group method. The correlated phases may be created or destroyed by tuning the hole density towards or away from the critical density. Our results establish p-type semiconductor quantum wells as a platform for novel correlated phases, which may be precisely controlled using electrostatic gating and external magnetic fields.
Towards elimination of Hepatitis C in Vietnam
Creators: name: Flower, Barnaby F.
Publisher: name: Imperial College London
Year: 2022

description: Vietnam has a high burden of viral hepatitis. This thesis strives to advance its elimination, addressing important gaps in the literature that I hope will contribute to treatment guidelines and health policy, both in Vietnam and internationally. Firstly, to define the hepatitis epidemic in Vietnam, I assimilate all published seroprevalence data since 1990 to estimate pooled prevalence of HBV, HCV and HDV in high and low risk populations. I show that although blood safety has improved, and HDV is largely confined to high-risk populations, a renewed focus on birth dose HBV vaccination and targeted HCV screening and treatment of people who inject drugs, is urgently required to meet elimination targets. The next chapters address HCV therapy, namely predictive factors for selecting individuals who could be treated for shorter duration, treatment failure in relation to rare HCV subtypes, and the clinical importance of resistance mutations. I describe a prospective clinical trial evaluating the efficacy of shortened sofosbuvir and daclatasvir therapy, based on early virological response: firstly, in genotype 1 or 6-infected individuals with mild disease (chapter 3) and then in genotype 6-infected individuals with advanced liver fibrosis (chapter 4). I show that shortened therapy, with retreatment if needed, can reduce antiviral use while maintaining high cure rates, but that day 2 virologic response alone is not an adequate predictor of cure. I demonstrate that a high frequency of putative NS5A inhibitor resistance mutations in genotype 6 infection does not impact cure rates, negating the need for costly genotyping in Vietnam. In my final data chapter, I explore an innovative means of decentralising HCV care. In two independent study populations from Vietnam and the UK, I show that an increase in routinely taken alanine transaminase after HCV therapy is a reliable screen for treatment failure that could substantially reduce reliance on nucleic acid testing in remote and resource-limited settings.
Review Paper  On Indicators And Growth Effects Of Related Variety At The National And Regional Level In The Eu
Creators: name: Frenken, Koen
name: Content, Jeroen
Publisher: name: Zenodo
Year: 2016
Subjects: Related variety
Economic development

description: Following the study by Frenken et al. (2007) introducing the concept of related variety in regional economics, a number of studies have been undertaken to analyze the effect of related variety on economic development. The review of related variety research made clear that – although the evidence base is still rather small with about 15 studies – most studies find support for the initial hypothesis by Frenken et al. (2007) that related variety supports regional employment growth. We also reviewed the studies looking at branching, following the study by Hidalgo et al. (2007). That is, the process in which a region or countries develops comparative advantage in new industries. Also here it was found that if a region or countries already hosts industries that are related to a specific industry, it is much more likely to become specialized in that industry. We end with a number of further research questions regarding: i. methodology, ii. the role of unrelated variety in regional development, and iii. the need to analyze how related variety may spur innovation and entrepreneurship.
Threshold corrections to hard supersymmetric relations
Creators: name: Giardino, Pier Paolo
name: Lodone, Paolo
Publisher: name: arXiv
Year: 2011
Subjects: subject: High Energy Physics - Phenomenology (hep-ph)
subject: FOS: Physical sciences

description: We compute the one-loop threshold corrections to hard supersymmetric relations involving gauge and gaugino couplings for the case of a Split-SUSY-like spectrum with moderate splitting. We show that these contributions are small, however in principle they will typically have to be taken into account if the heavy scalar sector is below 100 TeV and if one reaches, at future linear colliders, the precision that is necessary to perform this kind of measurements.
description: 6 pages, 2 figures
Solving constrained mean-field linear quadratic and other stochastic optimal control problems
Creators: name: Shi, Yuan
Publisher: name: Imperial College London
Year: 2022

description: We study a few constrained Stochastic Optimal Control Problems. First, we look at problems with terminal constraints. For various convex problems with constrained control, such as Linear Quadratic Mean-Field problem or Non-Markovian problem with stochastic coefficients, we draw equivalence relationship between the Fritz John condition and Karush–Kuhn–Tucker (KKT) conditions. Then we construct an unconstrained problem with the Lagrange Multiplier derived from Fritz John condition. Finally, we show the equivalence between the optimality of the unconstrained problem and its original problem. Furthermore, we look at the Duality of Linear Quadratic Mean-Field control problems and find an equivalence relationship between the primal and dual problems in the absence of control constraints. Lastly we compare the Riccati solutions to the Linear Quadratic Mean-Field control problem and the empirical solutions to the Mean-Field Forward Backward Stochastic Differential Equations (FBSDEs) using Deep Learning to verify our results.
Infrared and Ultraviolet Star Formation in Brightest Cluster Galaxies in the ACCEPT Sample
Creators: name: Hoffer, Aaron S.
name: Donahue, Megan
name: Hicks, Amalia
name: Barthelemy, R. S.
Publisher: name: arXiv
Year: 2012
Subjects: subject: Cosmology and Nongalactic Astrophysics (astro-ph.CO)
subject: FOS: Physical sciences

description: We present IR and UV photometry for a sample of brightest cluster galaxies (BCGs). The BCGs are from a heterogeneous but uniformly characterized sample, the Archive of Chandra Cluster Entropy Profile Tables (ACCEPT), of X-ray galaxy clusters from the Chandra X-ray telescope archive with published gas temperature, density, and entropy profiles. We use archival GALEX, Spitzer, and 2MASS observations to assemble spectral energy distributions (SEDs) and colors for BCGs. We find that while the SEDs of some BCGs follow the expectation of red, dust-free old stellar populations, many exhibit signatures of recent star formation in the form of excess UV or mid-IR emission, or both. We establish a mean near-UV to 2MASS K color of 6.59 \pm 0.34 for quiescent BCGs. We use this mean color to quantify the UV excess associated with star formation in the active BCGs. We use fits to a template of an evolved stellar population and library of starburst models and mid-IR star formation relations to estimate the obscured star formation rates. Many of the BCGs in X-ray clusters with low central gas entropy exhibit enhanced UV (38%) and mid-IR emission (43%), above that expected from an old stellar population. These excesses are consistent with on-going star formation activity in the BCG, star formation that appears to be enabled by the presence of high density, X-ray emitting gas in the the core of the cluster of galaxies. This hot, X-ray emitting gas may provide the enhanced ambient pressure and some of the fuel to trigger the star formation. This result is consistent with previous works that showed that BCGs in clusters with low central gas entropy host Hα emission-line nebulae and radio sources, while clusters with high central gas entropy exhibit none of these features. UV and mid-IR measurements combined provide a complete picture of unobscured and obscured star formation occurring in these systems.
description: 81 pages, 14 figures, Accepted for ApJS
K-Rational D-Brane Crystals
Creators: name: Schimmrigk, Rolf
Publisher: name: arXiv
Year: 2012
Subjects: subject: High Energy Physics - Theory (hep-th)
subject: FOS: Physical sciences

description: In this paper the problem of constructing spacetime from string theory is addressed in the context of D-brane physics. It is suggested that the knowledge of discrete configurations of D-branes is sufficient to reconstruct the motivic building blocks of certain Calabi-Yau varieties. The collections of D-branes involved have algebraic base points, leading to the notion of K-arithmetic D-crystals for algebraic number fields K. This idea can be tested for D0-branes in the framework of toroidal compactifications via the conjectures of Birch and Swinnerton-Dyer. For the special class of D0-crystals of Heegner type these conjectures can be interpreted as formulae that relate the canonical Neron-Tate height of the base points of the D-crystals to special values of the motivic L-function at the central point. In simple cases the knowledge of the D-crystals of Heegner type suffices to uniquely determine the geometry.
description: 36 pages
P2PCPM: Point to Point Critical Path Monitoring Based Denial of Service Attack Detection for Vehicular Communication Network Resource Management
Creators: name: Agarwal, Vartika
Publisher: name: figshare
Year: 2022
Subjects: Networking and communications
Cyberphysical systems and internet of things

description: Various types of security attacks are normal in vehicular communication networks. The current study uses a support vector machine to implement a Point to Point Critical Path Monitoring (P2PCPM) based Denial of Service (DOS) Attack detection technique for Vehicular Communication Network (VCN) resource management. Greatest quality of P2PCPM is that it eliminates attacked nodes from the network for the smooth process of vehicular communication. This scheme works well in terms of accuracy as well as attack detection rate. The whole simulation is made and tried by utilizing MATLAB Software. Simulation result shows 99% accuracy in case of security attack detection as well as reduced training and testing error upto 2%. Experimental results indicate that this scheme has a great efficiency and works well up to 1000 nodes, which is the limitation of current implementation. In future, simulation test may be done for unlimited nodes using similar or other techniques of attack detection.
Algorithms for the graph coloring problem
Creators: name: Yen, Yung-Hsien
Publisher: name: University of Calgary
Year: 1987
Subjects: subject: QA 611 Y44 1987
subject: Graph theory
subject: Algebraic topology

description: Bibliography: p. 75-77.
description: The graph coloring problem is known to be in the class of NP-complete problems. Two approaches of solving the problem have been discussed in the past: (1) formulating the problem into a 0-1 integer programming model, which mathematically expresses the feasibility of applying given colors to a graph, and solving the model iteratively using an implicit enumerat ion algorithm; and (2) implicitly enumerating all possible assignments of colors to the vertices. For the first approach, a 0-1 goal programming model is proposed , and an algorithm is constructed to solve the model. The algorithm requires a huge amount of storage; therefore, it is considered to be inferior to existing algorithms which utilize the second approach. However, the theoretical development of the model and the algorithm are discussed at length. For the second approach, a branch-and-bound algorithm is constructed which implicitly enumerates all possible assignments of colors to the vertices. The algorithm is further improved by incorporating a separation method called the range cutting method. The cutting method is shown experimentally to be effective for the graph coloring problem, and therefore, is extensively discussed in application to the integer programming problem. In an attempt to enhance the performance of the branch-and-bound algorithms, a heuristic algorithm modified from t he color-degree algorithm is constructed to generate a range for the optimal solution of the graph coloring problem . The modified algorithm gene rates much narrower ranges than the color-degree algorithm does, thus enhancing the efficiency of the graph coloring algorithms.
Miniature GaAs disk resonators probed by a looped fiber taper for optomechanics applications
Creators: name: Ding, L.
name: Senellart, P.
name: Lemaitre, A.
name: Ducci, S.
name: Leo, G.
name: Favero, I.
Publisher: name: arXiv
Year: 2012
Subjects: subject: Optics (physics.optics)
subject: FOS: Physical sciences

description: GaAs disk resonators (typical disk size 5 \mum * 200 nm in our work) are good candidates for boosting optomechanical coupling thanks to their ability to confine both optical and mechanical energy in a sub-micron interaction volume. We present results of optomechanical characterization of GaAs disks by near-field optical coupling from a tapered silica nano-waveguide. Whispering gallery modes with optical Q factor up to a few 10^5 are observed. Critical coupling, optical resonance doublet splitting and mode identification are discussed. We eventually show an optomechanical phenomenon of optical force attraction of the silica taper to the disk. This phenomenon shows that mechanical and optical degrees of freedom naturally couple at the micro-nanoscale.
Maximum likelihood degree of variance component models
Creators: name: Gross, Elizabeth
name: Drton, Mathias
name: Petrović, Sonja
Publisher: name: arXiv
Year: 2011
Subjects: subject: Statistics Theory (math.ST)
subject: FOS: Mathematics

description: Most statistical software packages implement numerical strategies for computation of maximum likelihood estimates in random effects models. Little is known, however, about the algebraic complexity of this problem. For the one-way layout with random effects and unbalanced group sizes, we give formulas for the algebraic degree of the likelihood equations as well as the equations for restricted maximum likelihood estimation. In particular, the latter approach is shown to be algebraically less complex. The formulas are obtained by studying a univariate rational equation whose solutions correspond to the solutions of the likelihood equations. Applying techniques from computational algebra, we also show that balanced two-way layouts with or without interaction have likelihood equations of degree four. Our work suggests that algebraic methods allow one to reliably find global optima of likelihood functions of linear mixed models with a small number of variance components.
A search for the Higgs boson decay to two electrons with the Compact Muon Solenoid experiment
Creators: name: Davies, Joe William
Publisher: name: Imperial College London
Year: 2022

description: A search is presented for the Higgs boson decay to a pair of electrons in proton-proton collisions at a centre-of-mass energy of 13 TeV. The data set was collected with the Compact Muon Solenoid experiment at the Large Hadron Collider between 2016 and 2018, corresponding to an integrated luminosity of 138 inverse femtobarns. The analysis develops event categories targeting Higgs boson production via gluon fusion and vector boson fusion, defined by selection on dedicated machine learning-based classifiers. An upper limit on the Higgs boson branching fraction to an electron pair is determined as 3.0 x 10^(-4) at the 95% confidence level, which is the most sensitive limit to date.
title: Adaptation as a Transmedial Process. Theories and Practices
Creators: name: Cangiano, Mimmo
name: Sambugaro, Filippo Luca
Publisher: name: Sapienza Università Editrice
Year: 2023

description: This miscellaneous volume aims at offering a fresh and updated view of adaptation and transmedial practices. In the wake of Linda Hutcheon’s groundbreaking study, A Theory of Adaptation (2006), it discusses theories and exemplary case studies from different critical perspectives and points of view assessing past and present trends, and envisioning future prospects. The volume is divided in three macro-sections: Theories explores some methodological and theoretical facets of adaptation; Practices I includes analyses of literary, cinematographic and theatrical texts; Practices II discusses transmedial examples relating to arts. The book ends with the interview with the Czech-German artist Michael Bielický, a pioneer in the use of multiple media (especially digital ones).
Selective gene expression in hydrogel suspended escherichia coli through optogenetics by spatiotemporally controlled light for the purposes of additive manufacturing
Creators: name: Lampret, Borut
Publisher: name: Imperial College London
Year: 2022

description: Advances in the ability to manipulate genetic material have enabled the utilization of microbes in production of both biological and synthetic materials. However, the vast majority of these materials are not suitable for additive manufacturing. While there have been significant advances in the field of bioprinting, significant effort is required to develop the so called bioinks, which support both the printing process and the encapsulated cells’ survivability. To combat these challenges, the work in this thesis investigates a novel method of additive manufacturing, which can employ microbial cell factories suspended in hydrogel and optogenetics to selectively deposit the desired biological or synthetic material in a three-dimensional volume. Genetically engineered Escherichia coli that produces CcaSR, a synthetic light response system, was used in order to establish spatially selective gene expression. A custom designed system was built to house the hydrogel suspended E. coli and to provide and shape the green and red light used to interact with the cells. A series of experiments were carried out to confirm localized gene expression within the hydrogel build volume and to test and confirm the behaviour of the CcaSR system. To enable the process of additive manufacturing, a series of spatiotemporal illumination procedures were developed and their behaviour investigated. A select illumination procedure was then employed in inducing gene expression in a nontrivial three-dimensional object confirming the viability of the proposed method for the purposes of additive manufacturing.
Cosmosis
Creators: name: Jennings, Elise
name: Zuntz, Joe
name: Paterno, Marc
name: Rudd, Doug
name: Manzotti, Alessandro
name: Dodelson, Scott
name: Bridle, Sarah
name: Sehrish, Saba
name: Kowalkowski, Jim
Publisher: name: Zenodo
Year: 2016

description: Cosmological parameter estimation is entering a new era. Large collaborations need to coordinate high-stakes analyses using multiple methods; furthermore such analyses have grown in complexity due to sophisticated models of cosmology and systematic uncertainties. In this paper we argue that modularity is the key to addressing these challenges: calculations should be broken up into interchangeable modular units with inputs and outputs clearly defined. We present a new framework for cosmological parameter estimation, CosmoSIS, designed to connect together, share, and advance development of inference tools across the community. We describe the modules already available in CosmoSIS, including CAMB, Planck, cosmic shear calculations, and a suite of samplers.
Entanglement entropy and quantum phase transitions in quantum dots coupled to Luttinger liquid wires
Creators: name: Goldstein, Moshe
name: Gefen, Yuval
name: Berkovits, Richard
Publisher: name: arXiv
Year: 2012
Subjects: subject: Mesoscale and Nanoscale Physics (cond-mat.mes-hall)
subject: Strongly Correlated Electrons (cond-mat.str-el)
subject: FOS: Physical sciences

description: We study a quantum phase transition which occurs in a system composed of two impurities (or quantum dots) each coupled to a different interacting (Luttinger-liquid) lead. While the impurities are coupled electrostatically, there is no tunneling between them. Using a mapping of this system onto a Kondo model, we show analytically that the system undergoes a Berezinskii-Kosterlitz-Thouless quantum phase transition as function of the Luttinger liquid parameter in the leads and the dot-lead interaction. The phase with low values of the Luttinger-liquid parameter is characterized by an abrupt switch of the population between the impurities as function of a common applied gate voltage. However, this behavior is hard to verify numerically since one would have to study extremely long systems. Interestingly though, at the transition the entanglement entropy drops from a finite value of $\ln(2)$ to zero. The drop becomes sharp for infinite systems. One can employ finite size scaling to extrapolate the transition point and the behavior in its vicinity from the behavior of the entanglement entropy in moderate size samples. We employ the density matrix renormalization group numerical procedure to calculate the entanglement entropy of systems with lead lengths of up to 480 sites. Using finite size scaling we extract the transition value and show it to be in good agreement with the analytical prediction.
description: 12 pages, 9 figures
The Utilization of horizontal wells for the production of conventional petroleum: a study of the theory and an analysis of the potential for applications in Canada
Creators: name: Yeung, W. Selina
Publisher: name: Engineering
Year: 1987
Subjects: subject: TN 871.2 Y48 1987
subject: Oil well drilling
subject: Oil wells
subject: Petroleum industry and trade - Environmental aspects - Yukon Territory

description: Bibliography: p. 122-126.