Results for "Edward R Dougherty"

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Moments and Root-Mean-Square Error of the Bayesian MMSE Estimator of Classification Error in the Gaussian ModelOct 05 2013Nov 12 2013The most important aspect of any classifier is its error rate, because this quantifies its predictive capacity. Thus, the accuracy of error estimation is critical. Error estimation is problematic in small-sample classifier design because the error must ... More
Optimal Clustering under UncertaintyJun 02 2018Classical clustering algorithms typically either lack an underlying probability framework to make them predictive or focus on parameter estimation rather than defining and minimizing a notion of error. Recent work addresses these issues by developing ... More
Optimal Clustering with Missing ValuesFeb 26 2019Missing values frequently arise in modern biomedical studies due to various reasons, including missing tests or complex profiling technologies for different omics measurements. Missing values can complicate the application of clustering algorithms, whose ... More
Sequential Experimental Design for Optimal Structural Intervention in Gene Regulatory Networks Based on the Mean Objective Cost of UncertaintyMay 30 2018Scientists are attempting to use models of ever increasing complexity, especially in medicine, where gene-based diseases such as cancer require better modeling of cell regulation. Complex models suffer from uncertainty and experiments are needed to reduce ... More
Scalable optimal Bayesian classification of single-cell trajectories under regulatory model uncertaintyFeb 08 2019Single-cell gene expression measurements offer opportunities in deriving mechanistic understanding of complex diseases, including cancer. However, due to the complex regulatory machinery of the cell, gene regulatory network (GRN) model inference based ... More
On homeomorphic product measures on the Cantor setNov 15 2004Nov 10 2005Let mu(r) be the Bernoulli measure on the Cantor space given as the infinite product of two-point measures with weights r and 1-r. It is a long-standing open problem to characterize those r and s such that mu(r) and mu(s) are topologically equivalent ... More
The distance and neutral environment of the massive stellar cluster Westerlund 1Apr 23 2007The goal of this study is to determine a distance to Westerlund 1 independent of the characteristics of the stellar population and to study its neutral environment, using observations of atomic hydrogen. The HI observations are taken from the Southern ... More
Translating the Cantor set by a randomMay 22 2012We determine the constructive dimension of points in random translates of the Cantor set. The Cantor set "cancels randomness" in the sense that some of its members, when added to Martin-Lof random reals, identify a point with lower constructive dimension ... More
Open sets satisfying systems of congruencesJan 03 2000A famous result of Hausdorff states that a sphere with countably many points removed can be partitioned into three pieces A,B,C such that A is congruent to B (i.e., there is an isometry of the sphere which sends A to B), B is congruent to C, and A is ... More
The VSOP 5 GHz AGN Survey II. Data Calibration and ImagingJul 01 2004The VSOP mission is a Japanese-led project to study radio sources with sub-milliarcsecond angular resolution using an orbiting 8-m telescope, HALCA and global arrays of Earth-based telescopes. Approximately 25% of the observing time has been devoted to ... More
ALMA observations of the supergiant B[e] star Wd1-9Sep 12 2016Mass-loss in massive stars plays a critical role in their evolution, although the precise mechanism(s) responsible - radiatively driven winds, impulsive ejection and/or binary interaction -remain uncertain. In this paper we present ALMA line and continuum ... More
Experimental Design via Generalized Mean Objective Cost of UncertaintyMay 03 2018The mean objective cost of uncertainty (MOCU) quantifies the performance cost of using an operator that is optimal across an uncertainty class of systems as opposed to using an operator that is optimal for a particular system. MOCU-based experimental ... More
Optimal Bayesian Transfer LearningJan 02 2018May 25 2018Transfer learning has recently attracted significant research attention, as it simultaneously learns from different source domains, which have plenty of labeled data, and transfers the relevant knowledge to the target domain with limited labeled data ... More
Size of the Vela Pulsar's Emission Region at 18 cm WavelengthJul 31 2012Sep 21 2012We present measurements of the linear diameter of the emission region of the Vela pulsar at observing wavelength lambda=18 cm. We infer the diameter as a function of pulse phase from the distribution of visibility on the Mopra-Tidbinbilla baseline. As ... More
Data management to support reproducible researchFeb 21 2015We describe the current state and future plans for a set of tools for scientific data management (SDM) designed to support scientific transparency and reproducible research. SDM has been in active use at our MRI Center for more than two years. We designed ... More
Iterated Monodromy Groups of Intermediate GrowthAug 05 2012Aug 29 2013We give two new examples of groups of intermediate growth, by a method that was first used by Bux and P\'erez. Our examples are the groups generated by the automata with the kneading sequences 11(0) and 0(011). By results of Nekrashevych, both of these ... More
Spatial First-passage Statistics of Al/Si(111)-(root3 x root3) Step FluctuationsOct 02 2008Spatial step edge fluctuations on a multi-component surface of Al/Si(111)-(root3 x root3) were measured via scanning tunneling microscopy over a temperature range of 720K-1070K, for step lengths of L = 65-160 nm. Even though the time scale of fluctuations ... More
Growth-Temperature Dependence of Conductivity at the LaCrO$_3$/SrTiO$_3$ (001) InterfaceJul 27 2018The effect of growth conditions on the structural and electronic properties of the polar/non-polar LaCrO$_3$/SrTiO$_3$ (LCO/STO) interface has been investigated. The interface is either insulating or metallic depending on growth conditions. A high sheet ... More
Action Variable Quantization, Energy Quantization, and Time ParametrizationAug 02 2015Mar 17 2016Additional information in the Hamilton-Jacobi representation of quantum mechanics, not available in the Schr\"odinger representation, renders microstates of $\psi$. This additional information is incorporated into the quantum reduced action, $W$. Jacobi's ... More
Polarised views of the drifting subpulse phenomenonApr 25 2006I review recent results concerning the shape of drifting subpulse patterns, and the relationship to model predictions. While a variety of theoretical models exist for drifting subpulses, observers typically think in terms of a spatio-temporal model of ... More
Dynamics of transcription-translation networksMay 26 2016A theory for qualitative models of gene regulatory networks has been developed over several decades, generally considering transcription factors to regulate directly the expression of other transcription factors, without any intermediate variables. Here ... More
Comments on Bouda and Djama's "Quantum Newton's law"Jun 18 2002Discussion of the differences between the trajectory representation of Floyd and that of Bouda and Djama [Phys. Lett. A 285 (2001) 27, quant-ph/0103071] renders insight: while Floyd's trajectories are related to group velocities, Bouda and Djama's are ... More
Meteoritical and dynamical constraints on the growth mechanisms and formation times of asteroids and JupiterJul 13 2006Peak temperatures inside meteorite parent bodies are closely linked to accretion times. Most iron meteorites come from bodies that accreted <0.5 Myr after CAIs formed and were melted by 26Al and 60Fe, probably inside 2 AU. Chondrite groups accreted intermittently ... More
The degree-diameter problem for several varieties of Cayley graphs, I: the Abelian caseDec 17 1994Sep 08 2000We address the degree-diameter problem for Cayley graphs of Abelian groups (Abelian graphs), both directed and undirected. The problem turns out to be closely related to the problem of finding efficient lattice coverings of Euclidean space by shapes such ... More
Undesired parking spaces and contractible pieces of the noncrossing partition linkJul 20 2017There are two natural simplicial complexes associated to the noncrossing partition lattice: the order complex of the full lattice and the order complex of the lattice with its bounding elements removed. The latter is a complex that we call the noncrossing ... More
High resolution radio emission from RCW 49/Westerlund 2Jul 24 2013Aug 19 2013RCW49 and its ionizing cluster form an extensive, complex region, widely studied at IR and optical wavelengths. Molonglo 843 MHz and ATCA data at 1.4 and 2.4 GHz showed two shells. Recent high-resolution IR imaging revealed a complex dust structure and ... More
The Liquidus Temperature for Methanol-Water Mixtures at High Pressure and Low Temperature, with Application to TitanDec 18 2018Methanol is a potentially important impurity in subsurface oceans on Titan and Enceladus. We report measurements of the freezing of methanol-water samples at pressures up to 350~MPa using a volumetric cell with sapphire windows. For low concentrations ... More
A tidal disruption-like X-ray flare from the quiescent galaxy SDSS J120136.02+300305.5Feb 27 2012SDSS J120136.02+300305.5 was detected in an XMM-Newton slew from June 2010 with a flux 56 times higher than an upper limit from ROSAT, corresponding to Lx~3x10^44 ergs/s. It has the optical spectrum of a quiescent galaxy (z=0.146). Overall the X-ray flux ... More
A Closed, Expanding Universe in String TheoryJun 19 1992We present a conformal field theory -- obtained from a gauged WZW model -- that describes a closed, inhomogeneous expanding and recollapsing universe in $3+1$ dimensions. A possible violation of cosmic censorship is avoided because the universe recollapses ... More
The Evolution of Distorted Rotating Black Holes II: Dynamics and AnalysisDec 22 1994We have developed a numerical code to study the evolution of distorted, rotating black holes. This code is used to evolve a new family of black hole initial data sets corresponding to distorted ``Kerr'' holes with a wide range of rotation parameters, ... More
The Evolution of Distorted Rotating Black Holes I: Methods and TestsDec 22 1994We have developed a new numerical code to study the evolution of distorted, rotating black holes. We discuss the numerical methods and gauge conditions we developed to evolve such spacetimes. The code has been put through a series of tests, and we report ... More
Defining ChaosJan 30 2015Apr 28 2015In this paper we propose, discuss and illustrate a computationally feasible definition of chaos which can be applied very generally to situations that are commonly encountered, including attractors, repellers and non-periodically forced systems. This ... More
Superconformal Field Theory on Threebranes at a Calabi-Yau SingularityJul 10 1998Jul 22 1998Just as parallel threebranes on a smooth manifold are related to string theory on $AdS_5\times {\bf S}^5$, parallel threebranes near a conical singularity are related to string theory on $AdS_5\times X_5$, for a suitable $X_5$. For the example of the ... More
Proton Decay in Intersecting D-brane ModelsApr 08 2003Jun 04 2003We analyze proton decay via dimension six operators in certain GUT-like models derived from Type IIA orientifolds with $D6$-branes. The amplitude is parametrically enhanced by a factor of $\alpha_{GUT}^{-1/3}$ relative to the coresponding result in four-dimensional ... More
AdS/CFT Correspondence and Symmetry BreakingMay 15 1999Jun 03 1999We study, using the dual AdS description, the vacua of field theories where some of the gauge symmetry is broken by expectation values of scalar fields. In such vacua, operators built out of the scalar fields acquire expectation values, and we show how ... More
Intelligent Decisions from the Hive Mind: Foragers and Nectar Receivers of Apis mellifera Collaborate to Optimise Active Forager NumbersJul 19 2010We present a differential equation-based mathematical model of nectar foraging by the honey bee Apis mellifera. The model focuses on two behavioural classes; nectar foragers and nectar receivers. Results generated from the model are used to demonstrate ... More
TEMPO2, a new pulsar timing package. I: OverviewMar 15 2006Contemporary pulsar timing experiments have reached a sensitivity level where systematic errors introduced by existing analysis procedures are limiting the achievable science. We have developed tempo2, a new pulsar timing package that contains propagation ... More
Discovery of extended radio emission in the young cluster Wd1Jul 29 1998We present 10 micron, ISO-SWS and Australia Telescope Compact Array observations of the region in the cluster Wd1 in Ara centred on the B[e] star Ara C. An ISO-SWS spectrum reveals emission from highly ionised species in the vicinity of the star, suggesting ... More
Orbitally modulated dust formation by the WC7+O5 colliding-wind binary WR140Feb 26 2009We present high-resolution infrared (2--18 micron) images of the archetypal periodic dust-making Wolf-Rayet binary system WR140 (HD 193793) taken between 2001 and 2005, and multi-colour (J -- [19.5]) photometry observed between 1989 and 2001. The images ... More
Nonsymmetric multigrid preconditioning for conjugate gradient methodsDec 30 2012Jun 21 2013We numerically analyze the possibility of turning off post-smoothing (relaxation) in geometric multigrid when used as a preconditioner in conjugate gradient linear and eigenvalue solvers for the 3D Laplacian. The geometric Semicoarsening Multigrid (SMG) ... More
How to Build a Graph in n Days: Some Variants on Graph AssemblyJul 21 2018Jan 27 2019In a recent article by M. Bona and A. Vince, the authors introduced the concept of an assembly tree for a graph. Assembly trees act as record keeping devices for the construction of a given graph from its vertices. In this paper we extend the work initiated ... More
Lorentz invariance violation in top-down scenarios of ultrahigh energy cosmic ray creationJun 29 2003Jan 28 2004The violation of Lorentz invariance (LI) has been invoked in a number of ways to explain issues dealing with ultrahigh energy cosmic ray (UHECR) production and propagation. These treatments, however, have mostly been limited to examples in the proton-neutron ... More
Antibiasing: High Mass-to-Light Ratios in Dense ClustersOct 20 1998Modeling of the velocity field of the Local Supercluster leads to the conclusion that there must be a substantial differential between the mass-to-light ratios of most galaxies and those in a small number of special places. Specifically, M/L=1000 is indicated ... More
A Relation Between Approaches to Integrability in Superconformal Yang-Mills TheoryAug 13 2003Sep 15 2003We make contact between the infinite-dimensional non-local symmetry of the typeIIB superstring on AdS5xS5 worldsheet theory and a non-abelian infinite-dimensional symmetry algebra for the weakly coupled superconformal gauge theory. We explain why the ... More
Orbital stability of periodic waves in the class of reduced Ostrovsky equationsMar 09 2016Periodic travelling waves are considered in the class of reduced Ostrovsky equations that describe low-frequency internal waves in the presence of rotation. The reduced Ostrovsky equations with either quadratic or cubic nonlinearities can be transformed ... More
Scaling Properties of Paths on GraphsJun 12 2013Let $G$ be a directed graph on finitely many vertices and edges, and assign a positive weight to each edge on $G$. Fix vertices $u$ and $v$ and consider the set of paths that start at $u$ and end at $v$, self-intersecting in any number of places along ... More
Flux Compactifications of String Theory on Twisted ToriMar 14 2005Global aspects of Scherk-Schwarz dimensional reduction are discussed and it is shown that it can usually be viewed as arising from a compactification on the compact space obtained by identifying a (possibly non-compact) group manifold G under a discrete ... More
Light-cone observations and cosmological models: implications for inhomogeneous models mimicking dark energyNov 19 2009Cosmological observables are used to construct cosmological models. Since cosmological observations are limited to the light cone, a fixed number of observables (even measured to arbitrary accuracy) may not uniquely determine a cosmological model without ... More
Arbitrage and GeometrySep 21 2017This article introduces the notion of arbitrage for a situation involving a collection of investments and a payoff matrix describing the return to an investor of each investment under each of a set of possible scenarios. We explain the Arbitrage Theorem, ... More
Attractor Reconstruction by Machine LearningMay 09 2018Jun 18 2018A machine-learning approach called "reservoir computing" has been used successfully for short-term prediction and attractor reconstruction of chaotic dynamical systems from time series data. We present a theoretical framework that describes conditions ... More
Chaotic stirring by a mesoscale surface-ocean flowApr 10 2002Jun 10 2002The horizontal stirring properties of the flow in a region of the East-Australian Current are calculated. A surface velocity field derived from remotely sensed data, using the Maximum Cross Correlation method, is integrated to derive the distribution ... More
Close companions to Brightest Cluster Galaxies: Support for minor mergers and downsizingJun 07 2012We identify close companions of Brightest Cluster Galaxies (BCGs) for the purpose of quantifying the rate at which these galaxies grow via mergers. By exploiting deep photometric data from the CFHTLS, we probe the number of companions per BCG (Nc) with ... More
Drifting sub-pulses in two newly discovered pulsarsSep 12 2001We have detected the rare phenomenon of stable, drifting sub-pulse behaviour in two pulsars discovered in the recent Swinburne intermediate latitude pulsar survey. The pulsars; PSR J1231-47 and PSR J1919+0134, have approximate periods (P) of 1.873 and ... More
Evidence for Heterotic/Heterotic DualityJan 09 1996We re-examine the question of heterotic - heterotic string duality in six dimensions and argue that the $E_8\times E_8$ heterotic string, compactified on $K3$ with equal instanton numbers in the two $E_8$'s, has a self-duality that inverts the coupling, ... More
Smooth classification of Cartan actions of higher rank semisimple Lie groups and their latticesJun 21 1996Nov 01 1999Let G be a connected semisimple Lie group without compact factors whose real rank is at least 2, and let \Gamma \subset G be an irreducible lattice. We provide a C^\infty classification for volume-preserving Cartan actions of \Gamma and G. Also, if G ... More
On Livsic's Theorem, Superrigidity, and Anosov Actions of Semisimple Lie GroupsJun 21 1996We prove a generalization of Livsic's Theorem on the vanishing of the cohomology of certain types of dynamical systems. As a consequence, we strengthen a result due to Zimmer concerning algebraic hulls of Anosov actions of semisimple Lie groups. Combining ... More
A nonabelian trace formulaDec 12 2013Jun 17 2014Let $E/F$ be an extension of number fields with $\mathrm{Gal}(E/F)$ simple and nonabelian. In [G] the first named author suggested an approach to nonsolvable base change and descent of automorphic representations of $\mathrm{GL}_2$ along such an extension. ... More
The "fundamental theorem" for the algebraic K-theory of spaces. III. the nil-termMay 07 2007May 08 2007In this paper we identify the ``nil-terms'' for Waldhausen's algebraic K-theory of spaces functor as the reduced K-theory of a category of equivariant spaces equipped with a homotopically nilpotent endomorphism.
Boundary BraidsNov 14 2018The n-strand braid group can be defined as the fundamental group of the configuration space of n unlabeled points in a closed disk based at a configuration where all n points lie in the boundary of the disk. Using this definition, the subset of braids ... More
Radio observations of the massive stellar cluster Westerlund 1May 07 2007High-dynamic range radio observations of Westerlund 1 are presented that detect a total of 21 stars in the young massive stellar cluster, the richest population of radio emitting stars known for any young massive galactic cluster in the Galaxy. We will ... More
Radio, X-ray, and gamma-ray Emission Models of the Colliding Winds Binary WR 140Mar 29 2006Jul 31 2006We use hydrodynamical models of the wind-collision region (WCR) in the archetype colliding-wind system WR140 to determine the spatial and spectral distribution of the radio, X-ray and gamma-ray emission from shock accelerated electrons. Our calculations ... More
Achievable Rate Regions for Network CodingNov 19 2013Determining the achievable rate region for networks using routing, linear coding, or non-linear coding is thought to be a difficult task in general, and few are known. We describe the achievable rate regions for four interesting networks (completely for ... More
The automorphism group of the doubly-even [72,36,16] code can only be of order 1, 3 or 5Mar 20 2013Mar 25 2013We prove that a putative $[72,36,16]$ code is not the image of linear code over $\ZZ_4$, $\FF_2 + u \FF_2$ or $\FF_2+v\FF_2$, thus proving that the extremal doubly even $[72,36,16]$-binary code cannot have an automorphism group containing a fixed point-free ... More
Granular Matter and the Marginal Rigidity StateMay 17 2001Model experiments are reported on the build-up of granular piles in two dimensions. These show that as the initial density of falling grains is increased, the resulting pile has decreasing final density and its coordination number approaches the low value ... More
The complex circumstellar environment of HD142527Jan 29 2011The recent findings of gas giant planets around young A-type stars suggest that disks surrounding Herbig Ae/Be stars will develop planetary systems. An interesting case is HD142527, for which previous observations revealed a complex circumstellar environment ... More
Numerical renormalization using dimensional regularization: a simple test case in the Lippmann-Schwinger equationOct 25 1999Jan 12 2000Dimensional regularization is applied to the Lippmann-Schwinger equation for a separable potential which gives rise to logarithmic singularities in the Born series. For this potential a subtraction at a fixed energy can be used to renormalize the amplitude ... More
Electron acceleration to relativistic energies at a strong quasi-parallel shock waveJan 08 2013Electrons can be accelerated to ultrarelativistic energies at strong (high-Mach number) collisionless shock waves that form when stellar debris rapidly expands after a supernova. Collisionless shock waves also form in the flow of particles from the Sun ... More
The subpulse modulation properties of pulsars at 21 cmJul 12 2005We present the results of a systematic, unbiased search for subpulse modulation of 187 pulsars performed with the Westerbork Synthesis Radio Telescope (WSRT) in the Netherlands at an observing wavelength of 21 cm. Using new observations and archival WSRT ... More
Statistics of the drifting subpulse phenomenonMay 08 2006We present the statistical results of a systematic, unbiased search for subpulse modulation of 187 pulsars performed with the Westerbork Synthesis Radio Telescope (WSRT) in the Netherlands at an observing wavelength of 21 cm (Weltevrede et al. 2006). ... More
Exotic massive hadrons and ultra-high energy cosmic raysMay 11 1998Oct 02 1998We investigate the proposal that primary cosmic rays of energy above the Greisen-Zatsepin-Kuzmin cutoff are exotic massive strongly interacting particles (uhecrons). We study the properties of air showers produced by uhecrons and find that masses in excess ... More
An algorithm for detection of extreme mass ratio inspirals in LISA dataFeb 24 2009The gravitational wave signal from a compact object spiralling toward a massive black hole (MBH) is thought to be one of the most difficult sources to detect in the LISA data stream. Due to the large parameter space of possible signals and many orbital ... More
Exploring a hidden symmetry with electrically charged quarksDec 03 2010It is usual to study confinement via quantum chromodynamics (QCD) alone. The deconfinement transition of the pure gauge theory (i.e. with static quarks) is then characterized by the breaking of center symmetry. Center vortices offer an intuitive and quantitative ... More
Fractional electric charge and quark confinementFeb 07 2012Owing to their fractional electric charges, quarks are blind to transformations that combine a color center phase with an appropriate electromagnetic one. Such transformations are part of a global $Z_6$-like center symmetry of the Standard Model that ... More
Fractional Charge and Confinement of QuarksNov 15 2013In quantum chromodynamics with static quarks the confinement-deconfinement phase transition is connected to the spontaneous breaking of the global Z3 center symmetry. This symmetry is lost when one considers dynamical quarks. Owing to the fractional electric ... More
X-Ray Amplification by Stimulated Brillouin ScatteringMay 24 2017Jul 23 2017Plasma-based parametric amplification using stimulated Brillouin scattering offers a route to coherent x-ray pulses orders-of-magnitude more intense than those of the brightest available sources. Brillouin amplification permits amplification of shorter ... More
Synchronization in large directed networks of coupled phase oscillatorsSep 09 2005We extend recent theoretical approximations describing the transition to synchronization in large undirected networks of coupled phase oscillators to the case of directed networks. We also consider extensions to networks with mixed positive/negative coupling ... More
The onset of synchronization in large networks of coupled oscillatorsNov 08 2004Jan 31 2005We study the transition from incoherence to coherence in large networks of coupled phase oscillators. We present various approximations that describe the behavior of an appropriately defined order parameter past the transition, and generalize recent results ... More
The Effect of Focal Distance, Age, and Brightness on Near-Field Augmented Reality Depth MatchingNov 30 2017Many augmented reality (AR) applications operate within near-field reaching distances, and require matching the depth of a virtual object with a real object. The accuracy of this matching was measured in three experiments, which examined the effect of ... More
Universal Aspects of Deconfinement in 2+1 DimensionsDec 08 2010The 2+1 dimensional pure SU(N) gauge theories with N <= 4 are candidates for applying the powerful tools of scaling and universality to their deconfinement transitions at finite temperature. The corresponding 2 dimensional q-state Potts models with q ... More
Universal Aspects of Deconfinement: Interfaces, Flux Tubes and Self-Duality in 2+1 DimensionsDec 02 2010We study center vortex free energies and 't Hooft's electric fluxes on the lattice in 2+1 dimensions, where SU(2) for example, is in the universality class of the 2d Ising model. This places a wealth of exact results at our fingertips. In particular, ... More
Are ultrahigh energy cosmic rays signals of supersymmetry?Jul 02 1997Dec 19 1997We investigate the possibility that cosmic rays of energy larger than the Greisen-Zatsepin-Kuzmin cutoff are not nucleons, but a new stable, massive, hadron that appears in many extensions of the standard model. We focus primarily on the S^0, a uds-gluino ... More
Theory of electromagnetic wave frequency upconversion in dynamic mediaApr 19 2018Aug 07 2018Frequency upconversion of an electromagnetic wave can occur in ionized plasma with decreasing electric permittivity and in split-ring resonator-structure metamaterials with decreasing magnetic permeability. We develop a general theory to describe the ... More
On vertex, edge, and vertex-edge random graphsDec 08 2008Oct 13 2010We consider three classes of random graphs: edge random graphs, vertex random graphs, and vertex-edge random graphs. Edge random graphs are Erdos-Renyi random graphs, vertex random graphs are generalizations of geometric random graphs, and vertex-edge ... More
Kinematic entanglement degradation of fermionic cavity modesOct 31 2011Jan 23 2012We analyse the entanglement and the non-locality of a (1+1)-dimensional massless Dirac field confined to a cavity on a worldtube that consists of inertial and uniformly accelerated segments, for small accelerations but arbitrarily long travel times. The ... More
Time evolution techniques for detectors in relativistic quantum informationDec 10 2012Apr 06 2013The techniques employed to solve the interaction of a detector and a quantum field typically require perturbation methods. We introduce mathematical techniques to solve the time evolution of an arbitrary number of detectors interacting with a quantum ... More
Scale dependence of branching in arterial and bronchial treesApr 29 2005Jul 26 2006Although models of branching in arterial and bronchial trees often predict a dependence of bifurcation parameters on the scale of the bifurcating vessels, direct verifications of this dependence with data are uncommon. We compare measurements of bifurcation ... More
Approximating the largest eigenvalue of network adjacency matricesMay 31 2007The largest eigenvalue of the adjacency matrix of a network plays an important role in several network processes (e.g., synchronization of oscillators, percolation on directed networks, linear stability of equilibria of network coupled systems, etc.). ... More
Spatial patterns of desynchronization bursts in networksJan 07 2004We adapt a previous model and analysis method (the {\it master stability function}), extensively used for studying the stability of the synchronous state of networks of identical chaotic oscillators, to the case of oscillators that are similar but not ... More
Using Learned Predictions as Feedback to Improve Control and Communication with an Artificial Limb: Preliminary FindingsAug 08 2014Many people suffer from the loss of a limb. Learning to get by without an arm or hand can be very challenging, and existing prostheses do not yet fulfil the needs of individuals with amputations. One promising solution is to provide greater communication ... More
Thermal diffusion of supersonic solitons in an anharmonic chain of atomsFeb 04 2002Nov 16 2002We study the non-equilibrium diffusion dynamics of supersonic lattice solitons in a classical chain of atoms with nearest-neighbor interactions coupled to a heat bath. As a specific example we choose an interaction with cubic anharmonicity. The coupling ... More
Convectively driven shear and decreased heat fluxAug 20 2014We report on direct numerical simulations of two-dimensional, horizontally periodic Rayleigh-B\'enard convection, focusing on its ability to drive large-scale horizontal flow that is vertically sheared. For the Prandtl numbers ($Pr$) between 1 and 10 ... More
SU(3) Deconfinement in (2+1)d from Twisted Boundary Conditions and Self-DualityDec 03 2010We study the pure SU(3) gauge theory in 2+1 dimensions on the lattice using 't Hooft's twisted boundary conditions to force non-vanishing center flux through the finite volume. In this way we measure the free energy of spacelike center vortices as an ... More
Local spin-wave dispersion and damping in thin yttrium-iron-garnet filmsMar 13 2018Using ultrafast magneto-optic sampling microscopy, we investigate the spin-wave dispersion and spin-wave damping in yttrium-iron-garnet films. With the aid of the inhomogeneous magnetic field generated by coplanar waveguides spin-waves are excited at ... More
Molecular origin of constant m-values, denatured state collapse, and residue-dependent transition midpoints in globular proteinsApr 16 2009Experiments show that for many two state folders the free energy of the native state DG_ND([C]) changes linearly as the denaturant concentration [C] is varied. The slope, m = d DG_ND([C])/d[C], is nearly constant. The m-value is associated with the difference ... More
Fermionic mode entanglement in quantum informationNov 30 2012Feb 25 2013We analyze fermionic modes as fundamental entities for quantum information processing. To this end we construct a density operator formalism on the underlying Fock space and demonstrate how it can be naturally and unambiguously equipped with a notion ... More
Optimal multi-dimensional stochastic harvesting with density-dependent pricesJun 30 2014Jun 26 2015We prove a verification theorem for a class of singular control problems which model optimal harvesting with density-dependent prices or optimal dividend policy with capital-dependent utilities. The result is applied to solve explicitly some examples ... More
Extensional and Intensional StrategiesJan 25 2010This paper is a contribution to the theoretical foundations of strategies. We first present a general definition of abstract strategies which is extensional in the sense that a strategy is defined explicitly as a set of derivations of an abstract reduction ... More
The orbit and distance of WR140Nov 03 2010A campaign of 35 epochs of milli-arcsecond resolution VLBA observations of the archetype colliding wind WR+O star binary system WR140 show the wind-collision region (WCR) as a bow-shaped arc of emission that rotates as the highly eccentric orbit progresses. ... More
Characterization of Saturn's bow shock: Magnetic field observations of quasi-perpendicular shocksMay 16 2016Collisionless shocks vary drastically from terrestrial to astrophysical regimes resulting in radically different characteristics. This poses two complexities. Firstly, separating the influences of these parameters on physical mechanisms such as energy ... More
The Flat Beam Experiment at the FNAL PhotoinjectorAug 12 2000A technique for production of an electron beam with a high transverse emittance ratio. a "flat" beam, has been proposed by Brinkmann, Derbenev, and Floettmann.[1] The cathode of an RF-laser gun is immersed in a solenoidal magnetic field; as a result the ... More