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Results for "Joseph N. Burchett"
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The Power Spectrum of the Lyman-$α$ Forest at z < 0.5Aug 16 2018Apr 09 2019We present new measurements of the flux power-spectrum P(k) of the $z<0.5$ HI Lyman-$\alpha$ forest spanning scales k ~ 0.001-0.1 s/km. These results were derived from 65 far ultraviolet quasar spectra (resolution R~18000) observed with the Cosmic Origin ... More The Power Spectrum of the Lyman-$α$ Forest at z < 0.5Aug 16 2018We present new measurements of the flux power-spectrum P(k) of the z<0.5 H I Lyman-$\alpha$ forest spanning scales k ~ 0.001-0.1 s/km. These results were derived from 65 far ultraviolet quasar spectra (resolution R~18,000) observed with Cosmic Origin ... More The Panchromatic Circumgalactic MediumMar 26 2019Galaxies are surrounded by extended atmospheres, which are often called the circumgalactic medium (CGM) and are the least understood part of galactic ecosystems. The CGM serves as a reservoir of both diffuse, metal-poor gas accreted from the intergalactic ... More The COS-Dwarfs Survey: The Carbon Reservoir Around sub-L* GalaxiesJun 02 2014Nov 20 2014We report new observations of circumgalactic gas from the COS-Dwarfs survey, a systematic investigation of the gaseous halos around 43 low-mass z $\leq$ 0.1 galaxies using background QSOs observed with the Cosmic Origins Spectrograph. From the projected ... More The Shape of Saturn's Huygens Ringlet Viewed by Cassini ISSSep 24 2015Oct 07 2015A new model for the shape of the prominent eccentric ringlet in the gap exterior to Saturn's B-ring is developed based on Cassini imaging observations taken over about 8 years. Unlike previous treatments, the new model treats each edge of the ringlet ... More Dynamics of the Sharp Edges of Broad Planetary RingsApr 04 2009(Abridged) The following describes a model of a broad planetary ring whose sharp edge is confined by a satellite's m^th Lindblad resonance (LR). This model uses a streamline formalism to calculate the ring's internal forces, namely, ring gravity, pressure, ... More Theory of fermion to boson mappings: old wine in new bottlesOct 05 1994After a brief review of various mappings of fermion pairs to bosons, we rigorously derive a general approach. Following the methods of Marumori and Otsuka, Arima, and Iachello, our approach begins with mapping states and constructs boson representations ... More Fermion to boson mappings revisitedAug 15 1994We briefly review various mappings of fermion pairs to bosons, including those based on mapping operators, such as Belyaev-Zelevinskii, and those on mapping states, such as Marumori; in particular we consider the work of Otsuka-Arima-Iachello, aimed at ... More Exact, finite, and Hermitian fermion-pair-to-boson mappingNov 10 1993We discuss a general, exact (in that matrix elements are preserved) mapping of fermion pairs to bosons, and find a simple factorization of the boson representation of fermion operators. This leads to boson Hamiltonians that are Hermitian and finite, with ... More Size Effects in the Ginzburg-Landau TheoryApr 22 2015The Ginzburg-Landau theory is analyzed in the case of small dimension superconductors, a couple of orders of magnitude above the coherence length, where the theory is still valid but quantum fluctuations become significant. In this regime, the potential ... More Hermitian boson mapping and finite truncationMay 23 1994Starting from a general, microscopic fermion-to-boson mapping that preserves Hermitian conjugation, we discuss truncations of the boson Fock space basis. We give conditions under which the exact boson images of finite fermion operators are also finite ... More pdbmine: A Node.js API for the RCSB Protein Data Bank (PDB)Apr 03 2019Summary: The advent of Web-based tools that assist in the analysis and visualization of macromolecules require application programming interfaces (APIs) designed for modern web frameworks. To this end, we have developed a Node.js module pdbmine that allows ... More MASON: A Model AgnoStic ObjectNess FrameworkSep 20 2018This paper proposes a simple, yet very effective method to localize dominant foreground objects in an image, to pixel-level precision. The proposed method 'MASON' (Model-AgnoStic ObjectNess) uses a deep convolutional network to generate category-independent ... More Optimal Control of Rotary MotorsJul 28 2018Single-molecule experiments have found near-perfect thermodynamic efficiency in the rotary motor F1-ATP synthase. To help elucidate the principles underlying nonequilibrium energetic efficiency in such stochastic machines, we investigate driving protocols ... More C4Synth: Cross-Caption Cycle-Consistent Text-to-Image SynthesisSep 20 2018Generating an image from its description is a challenging task worth solving because of its numerous practical applications ranging from image editing to virtual reality. All existing methods use one single caption to generate a plausible image. A single ... More Avoided Critical Behavior in O(n) SystemsAug 31 1998Oct 12 1998Long-range frustrating interactions, even if their strength is infinitesimal, can give rise to a dramatic proliferations of ground or near-ground states. As a consequence, the ordering temperature can exhibit a discontinuous drop as a function of the ... More Absence of Scaling in the Integer Quantum Hall EffectJun 18 1998Jun 24 1998We have studied the conductivity peak in the transition region between the two lowest integer Quantum Hall states using transmission measurements of edge magnetoplasmons. The width of the transition region is found to increase linearly with frequency ... More Analysis of Computer Experiments with Functional ResponseNov 07 2012This paper is motivated by a computer experiment conducted for optimizing residual stresses in the machining of metals. Although kriging is widely used in the analysis of computer experiments, it cannot be easily applied to model the residual stresses ... More Astronomy of Cholanaikkan tribe of KeralaFeb 14 2017Cholanaikkans are a diminishing tribe of India. With a population of less than 200 members, this tribe living in the reserved forests about 80 km from Kozhikode, it is one of the most isolated tribes. A programme of the Government of Kerala brings some ... More Embedding Half-Edge Graphs in Punctured SurfacesAug 29 2017Sep 05 2017It is known that graphs cellularly embedded into surfaces are equivalent to ribbon graphs. In this work, we generalize this statement to broader classes of graphs and surfaces. Half-edge graphs extend abstract graphs and are useful in quantum field theory ... More The Central Component of Gravitational Lens Q0957+561Jan 25 2008In 1981, a faint radio source (G') was detected near the center of the lensing galaxy of the famous "twin quasar" Q0957+561. It is still unknown whether this central radio source is a third quasar image or an active nucleus of the lensing galaxy, or a ... More Black Holes and Galactic Density Cusps : From Black Hole to BulgeNov 12 2009Nov 12 2010Aims. In this paper we continue our study of density cusps that may contain central black holes. Methods. We recall our attempts to use distribution functions with a memory of self-similar relaxation, but mostly they apply only in restricted regions of ... More A Polynomial Invariant for Rank 3 Weakly-Colored Stranded GraphsJan 09 2013Apr 01 2013The Bollobas-Riordan polynomial [Math. Ann. 323, 81 (2002)] is a universal polynomial invariant for ribbon graphs. We find an extension of this polynomial for a particular family of graphs called rank 3 weakly-colored stranded graphs. These graphs live ... More The zero-energy state in graphene in a high magnetic fieldAug 14 2007Dec 05 2007The fate of the charge-neutral Dirac point in graphene in a high magnetic field $H$ has been investigated at low temperatures ($T\sim$ 0.3 K). In samples with small $V_0$ (the gate voltage needed to access the Dirac point), the resistance $R_0$ at the ... More Complex dynamics and development of behavioural individualityMar 22 2018Behavioural differences may arise in the absence of genetic or environmental variation. Chaotic dynamics may influence behavioural development, and so this among-individual variation. We discuss methods and experimental designs to test this idea. Ultimately, ... More Gemini H-band imaging of the field of a z=10 candidateSep 21 2004We present a deep H-band image of the field of a candidate z=10 galaxy magnified by the foreground (z=0.25) cluster A1835. The image was obtained with NIRI on Gemini North to better constrain the photometry and investigate the morphology of the source. ... More A study on the curling number of graph classesDec 03 2015Jun 21 2016Given a finite nonempty sequence $S$ of integers, write it as $XY^k$, consisting of a prefix $X$ (which may possibly be empty), followed by $k$ copies of a non-empty string $Y$. Then, the greatest such integer $k$ is called the curling number of $S$ and ... More Dynamic optical properties of metal hydridesAug 22 2018Sep 04 2018Metal hydrides often display dramatic changes in optical properties upon hydrogenation. These shifts make them prime candidates for many tunable optical devices, such as optical hydrogen sensors and switchable mirrors. While some of these metals, such ... More Centrifugal Effects in a Bose-Einstein CondensateJul 17 1996Single particle states in the atomic trap employing the rotating magnetic field are found using the full time-dependent instantaneous trapping potential. These states are compared with those of the effective time-averaged potential. We show that the trapping ... More The Exploration of the UnknownOct 08 2004Nov 26 2004The Square Kilometre Array is conceived as a telescope which will both test fundamental physical laws and transform our current picture of the Universe. However, the scientific challenges outlined in this book are today's problems--will they still be ... More The Radio Wavelength Time Delay of Gravitational Lens 0957+561Jul 11 1998The gravitational lens 0957+561 was monitored with the Very Large Array from 1979 to 1997. The 6 cm light curve data from 1995-1997 and the 4 cm data from 1990-1997 are reported here. At 4 cm, the intrinsic source variations occur earlier and are twice ... More Magnetism in C60 Films Induced by Proton IrradiationMar 13 2005Mar 22 2005It is shown that polycrystalline fullerene thin films on hydrogen passivated Si(111) substrates irradiated by 2 MeV protons displays ferromagnetic-like behavior at 5 K. At 300 K both the pristine and the irradiated film show diamagnetic behavior. Magnetization ... More Sensitivity and accuracy of Casimir force measurements in airNov 17 2018Quantum electrodynamic fluctuations cause an attractive force between metallic surfaces. At separations where the finite speed of light affects the interaction, it is called the Casimir force. Thermal motion determines the fundamental sensitivity limits ... More Long term Ultra-Violet Variability of Seyfert galaxiesOct 13 2018Flux variability is one of the defining characteristics of Seyfert galaxies, a class of active galactic nuclei (AGN). Though these variations are observed over a wide range of wavelengths, results on their flux variability characteristics in the ultra-violet ... More New Variable Stars in the Globular Cluster NGC 6584May 04 2012Using the Southeastern Association for Research in Astronomy 0.6 meter telescope located at Cerro Tololo, we searched for variable stars in the southern globular cluster NGC 6584. We obtained images during 8 nights between 28 May and 6 July of 2011. After ... More Some New Results on the Curling Number of GraphsOct 01 2015Aug 09 2016Let $S=S_1S_2S_3\ldots S_n$ be a finite string. Write $S$ in the form $XYY\ldots Y=XY^k$, consisting of a prefix $X$ (which may be empty), followed by $k$ copies of a non-empty string $Y$. Then, the greatest value of this integer $k$ is called the curling ... More Distributed Gradient Descent in Bacterial Food SearchApr 11 2016Communication and coordination play a major role in the ability of bacterial cells to adapt to ever changing environments and conditions. Recent work has shown that such coordination underlies several aspects of bacterial responses including their ability ... More