Results for "Christine L. Borgman"

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The Durability and Fragility of Knowledge Infrastructures: Lessons Learned from AstronomyOct 31 2016Infrastructures are not inherently durable or fragile, yet all are fragile over the long term. Durability requires care and maintenance of individual components and the links between them. Astronomy is an ideal domain in which to study knowledge infrastructures, ... More
Using the Jupyter Notebook as a Tool for Open Science: An Empirical StudyApr 16 2018As scientific work becomes more computational and data intensive, research processes and results become more difficult to interpret and reproduce. In this poster, we show how the Jupyter notebook, a tool originally designed as a free version of Mathematica ... More
Effects of Quantum Stress Tensor Fluctuations with Compact Extra DimensionsJun 16 2004The effects of compact extra dimensions upon quantum stress tensor fluctuations are discussed. It is argued that as the compactification volume decrease, these fluctuations increase in magnitude. In principle, this would have the potential to create observable ... More
Text Data Mining from the Author's Perspective: Whose Text, Whose Mining, and to Whose Benefit?Mar 12 2018Given the many technical, social, and policy shifts in access to scholarly content since the early days of text data mining, it is time to expand the conversation about text data mining from concerns of the researcher wishing to mine data to include concerns ... More
Open Data, Grey Data, and Stewardship: Universities at the Privacy FrontierFeb 08 2018Sep 27 2018As universities recognize the inherent value in the data they collect and hold, they encounter unforeseen challenges in stewarding those data in ways that balance accountability, transparency, and protection of privacy, academic freedom, and intellectual ... More
Open Data, Grey Data, and Stewardship: Universities at the Privacy FrontierFeb 08 2018As universities recognize the inherent value in the data they collect and hold, they encounter unforeseen challenges in stewarding those data in ways that balance accountability, transparency, and protection of privacy, academic freedom, and intellectual ... More
Digital Data Archives as Knowledge Infrastructures: Mediating Data Sharing and ReuseFeb 08 2018Nov 07 2018Digital archives are the preferred means for open access to research data. They play essential roles in knowledge infrastructures - robust networks of people, artifacts, and institutions - but little is known about how they mediate information exchange ... More
Digital Data Archives as Knowledge Infrastructures: Mediating Data Sharing and ReuseFeb 08 2018Digital data archives play essential roles in knowledge infrastructures by mediating access to data within and between communities. This three-year qualitative study of DANS, a digital data archive containing more than 50 years of heterogeneous data types, ... More
From Artifacts to Aggregations: Modeling Scientific Life Cycles on the Semantic WebJun 14 2009Oct 21 2009In the process of scientific research, many information objects are generated, all of which may remain valuable indefinitely. However, artifacts such as instrument data and associated calibration information may have little value in isolation; their meaning ... More
Drying and percolation in spatially correlated porous mediaSep 10 2018We study how the dynamics of a drying front propagating through a porous medium are affected by small-scale correlations in material properties. For this, we first present drying experiments in micro-fluidic micro-models of porous media. Here, the fluid ... More
The Effects of Stress Tensor Fluctuations upon FocusingJul 10 2003Nov 10 2004We treat the gravitational effects of quantum stress tensor fluctuations. An operational approach is adopted in which these fluctuations produce fluctuations in the focusing of a bundle of geodesics. This can be calculated explicitly using the Raychaudhuri ... More
On the Asymptotics of a Prime Spin RelationJul 02 2018Nov 18 2018For totally real cyclic number fields satisfying certain properties, we give formulas for the density of primes that satisfy a spin relation.
Coincidences between characters to hooks and 2-part partitions on families arising from 2-regular classesOct 24 2016Strongly refining results by Regev, Regev and Zeilberger, we prove surprising coincidences between characters to 2-part partitions of size n and characters to hooks of size n+2 on two related families obtained by extending 2-regular conjugacy classes. ... More
On the Kontsevich-Kuperberg-Thurston construction of a configuration-space invariant for rational homology 3-spheresNov 04 2004M. Kontsevich proposed a topological construction for an invariant Z of rational homology 3-spheres using configuration space integrals. G. Kuperberg and D. Thurston proved that Z is a universal real finite type invariant for integral homology spheres ... More
Punctuation in Quoted SpeechAug 16 1996Quoted speech is often set off by punctuation marks, in particular quotation marks. Thus, it might seem that the quotation marks would be extremely useful in identifying these structures in texts. Unfortunately, the situation is not quite so clear. In ... More
The rank of a hypergeometric systemJul 02 2008Feb 10 2010The holonomic rank of the A-hypergeometric system M_A(\beta) is the degree of the toric ideal I_A for generic parameters; in general, this is only a lower bound. To the semigroup ring of A we attach the ranking arrangement and use this algebraic invariant ... More
Globalizing L-infinity automorphisms of the Schouten algebra of polyvector fieldsJan 06 2012Jan 17 2013Recently, Willwacher showed that the Grothendieck-Teichmuller group GRT acts by L-infinity-automorphisms on the Schouten algebra of polyvector fields T_poly(R^d) on affine space R^d. In this article, we prove that a large class of L-infinity-automorphisms ... More
Surgery formulae for finite type invariants of rational homology 3--spheresMar 12 2007We first present three graphic surgery formulae for the degree $n$ part $Z_n$ of the Kontsevich-Kuperberg-Thurston universal finite type invariant of rational homology spheres. Each of these three formulae determines an alternate sum of the form $$\sum_{I ... More
A Survey on Latent Tree Models and ApplicationsFeb 04 2014In data analysis, latent variables play a central role because they help provide powerful insights into a wide variety of phenomena, ranging from biological to human sciences. The latent tree model, a particular type of probabilistic graphical models, ... More
How to Host a Data Competition: Statistical Advice for Design and Analysis of a Data CompetitionJan 16 2019Data competitions rely on real-time leaderboards to rank competitor entries and stimulate algorithm improvement. While such competitions have become quite popular and prevalent, particularly in supervised learning formats, their implementations by the ... More
10 Simple Rules for the Care and Feeding of Scientific DataJan 09 2014This article offers a short guide to the steps scientists can take to ensure that their data and associated analyses continue to be of value and to be recognized. In just the past few years, hundreds of scholarly papers and reports have been written on ... More
Infrared Spectroscopy of HR 4796A's Bright Outer Cometary Ring + Tenuous Inner Hot Dust CloudAug 09 2017We have obtained new NASA IRTF SpeX spectra of the HR 4796A debris ring system. We find a unique red excess flux that extends out to ~9 um in Spitzer IRS spectra, where thermal emission from cold, ~100K dust from the system's ring at ~75 AU takes over. ... More
6,13-dihydropentacene and pentacene single co-crystalsOct 10 20026,13-dihydropentacene and pentacene co-crystallise in a ratio of 2:1 during vapour transport of commercial pentacene in a gas flow. The crystal structure is monoclinic P2_1/n and contains one dihydropentacene molecule, and half a pentacene molecule in ... More
The effect of feedback and reionization on star formation in low-mass dwarf galaxy haloesNov 05 2012Mar 18 2013We simulate the evolution of a 10^9 Msun dark matter halo in a cosmological setting with an adaptive-mesh refinement code as an analogue to local low luminosity dwarf irregular and dwarf spheroidal galaxies. The primary goal of our study is to investigate ... More
Truncated quantum Drinfeld Hecke algebras and Hochschild cohomologyNov 09 2017We consider deformations of quantum exterior algebras extended by finite groups. Among these deformations are a class of algebras which we call truncated quantum Drinfeld Hecke algebras in view of their relation to classical Drinfeld Hecke algebras. We ... More
Thermodynamic Geodesics of a Reissner Nordström Black HoleSep 23 2016Starting from a Geometrothermodynamics metric for the space of thermodynamic equilibrium states in the mass representation, we use numerical techniques to analyse the thermodynamic geodesics of a supermassive Reissner Nordstr\"om black hole in isolation. ... More
Molecular Gas in Candidate Double-Barred Galaxies II. Cooler, Less Dense Gas Associated with Stronger Central ConcentrationsJan 07 2003We have performed a multi-transition CO study of the centers of seven double-barred galaxies that exhibit a variety of molecular gas morphologies to determine if the molecular gas properties are correlated with the nuclear morphology and star forming ... More
Weighted locally gentle quivers and Cartan matricesNov 24 2005We study the class of weighted locally gentle quivers. This naturally extends the class of gentle quivers and gentle algebras, which have been intensively studied in the representation theory of finite-dimensional algebras, to a wider class of potentially ... More
Mackey-complete spaces and power series -- A topological model of Differential Linear LogicJul 12 2015In this paper, we have described a denotational model of Intuitionist Linear Logic which is also a differential category. Formulas are interpreted as Mackey-complete topological vector space and linear proofs are interpreted by bounded linear functions. ... More
On p-parts of Brauer character degrees and p-regular conjugacy class sizesApr 23 2018Let $G$ be a finite group, $p$ a prime, and $IBr_p(G)$ the set of irreducible $p$-Brauer characters of $G$. Let $\bar e_p(G)$ be the largest integer such that $p^{\bar e_p(G)}$ divides $\chi(1)$ for some $\chi \in IBr_p(G)$. We show that $|G:O_p(G)|_p ... More
Compactness Results for Sequences of Approximate Biharmonic MapsDec 20 2013Mar 26 2015In this article, we prove energy quantization for approximate (intrinsic and extrinsic) biharmonic maps into spheres where the approximate map is in $L \log L$. Moreover, we demonstrate that if the $L\log L$ norm of the approximate maps does not concentrate, ... More
Sur l'homologie des groupes orthogonaux et symplectiques à coefficients tordusAug 29 2008Oct 19 2009We compute the stable homology of orthogonal and symplectic groups over a finite field k with coefficients coming from an usual endofunctor F of k-vector spaces (exterior, symmetric, divided powers...), that is, for all natural integer i, we compute the ... More
The Wyoming Survey for H-alpha. I. Initial Results at z ~ 0.16 and 0.24Feb 05 2008The Wyoming Survey for H-alpha, or WySH, is a large-area, ground-based, narrowband imaging survey for H-alpha-emitting galaxies over the latter half of the age of the Universe. The survey spans several square degrees in a set of fields of low Galactic ... More
Merger Signatures in the Galaxy Cluster Abell 98Jul 10 2014We present results from Chandra and XMM-Newton observations of Abell 98 (A98), a galaxy cluster with three major components: a relatively bright subcluster to the north (A98N), a disturbed subcluster to the south (A98S), and a fainter subcluster to the ... More
Superconducting Optoelectronic Neurons III: Synaptic PlasticityMay 04 2018Jul 03 2018As a means of dynamically reconfiguring the synaptic weight of a superconducting optoelectronic loop neuron, a superconducting flux storage loop is inductively coupled to the synaptic current bias of the neuron. A standard flux memory cell is used to ... More
Modified Gravity and the CMBSep 27 2011Dec 09 2011We consider the effect of modified gravity on the peak structure of the Cosmic Microwave Background (CMB) spectrum. We focus on simple models of modified gravity mediated by a massive scalar field coupled to both baryons and cold dark matter. This captures ... More
SupersymmetronSep 02 2011Dec 09 2011We consider a supersymmetric model of dark energy coupled to cold dark matter: the supersymmetron. In the absence of cold dark matter, the supersymmetron converges to a supersymmetric minimum with a vanishing cosmological constant. When cold dark matter ... More
On (almost) extreme components in Kronecker products of characters of the symmetric groupsMay 16 2011Apr 12 2013Using a recursion formula due to Dvir, we obtain information on maximal and almost maximal components in Kronecker products of characters of the symmetric groups. This is applied to confirm a conjecture made by Bessenrodt and Kleshchev in 1999, which ... More
A-graded methods for monomial idealsJul 28 2008Mar 04 2009We use \ZZ^d-gradings to study d-dimensional monomial ideals. The Koszul functor is employed to interpret the quasidegrees of local cohomology in terms of the geometry of distractions and to explicitly compute the multiplicities of exponents. These multigraded ... More
Large Deviations for Random Trees and the Branching of RNA Secondary StructuresMar 27 2008We give a Large Deviation Principle (LDP) with explicit rate function for the distribution of vertex degrees in plane trees, a combinatorial model of RNA secondary structures. We calculate the typical degree distributions based on nearest neighbor free ... More
On alpha stable distribution of wind driven water surface wave slopeOct 02 2008We propose a new formulation of the probability distribution function of wind driven water surface slope with an $\alpha$-stable distribution probability. The mathematical formulation of the probability distribution function is given under an integral ... More
A General Stochastic Algorithmic Framework for Minimizing Expensive Black Box Objective Functions Based on Surrogate Models and Sensitivity AnalysisOct 23 2014We are focusing on bound constrained global optimization problems, whose objective functions are computationally expensive black-box functions and have multiple local minima. The recently popular Metric Stochastic Response Surface (MSRS) algorithm proposed ... More
Submatrices of character tables and basic setsOct 04 2011Jun 03 2012In this investigation of character tables of finite groups we study basic sets and associated representation theoretic data for complementary sets of conjugacy classes. For the symmetric groups we find unexpected properties of characters on restricted ... More
The quadratic assignment problem: the linearization of Xia and Yuan is weaker than the linearization of Adams and Johnson and a family of cuts to narrow the gapOct 06 2017Jun 29 2018The quadratic assignment problem is a well-known optimization problem with numerous applications. A common strategy to solve it is to use one of its linearizations and then apply the toolbox of mixed integer linear programming methods. One measure of ... More
Logarithmically spiraling helicoidsApr 28 2014Apr 29 2014We construct helicoid-like embedded minimal disks with axes along self-similar curves modeled on logarithmic spirals. The surfaces have a self-similarity inherited from the curves and the nature of the construction. Moreover, inside of a "logarithmic ... More
Filling area conjecture, optimal systolic inequalities, and the fiber class in abelian coversDec 01 2004Sep 23 2005We investigate the filling area conjecture, optimal systolic inequalities, and the related problem of the nonvanishing of certain linking numbers in 3-manifolds.
Variable selection through CARTJan 04 2011This paper deals with variable selection in the regression and binary classification frameworks. It proposes an automatic and exhaustive procedure which relies on the use of the CART algorithm and on model selection via penalization. This work, of theoretical ... More
Outlier robust corner-preserving methods for reconstructing noisy imagesAug 03 2007The ability to remove a large amount of noise and the ability to preserve most structure are desirable properties of an image smoother. Unfortunately, they usually seem to be at odds with each other; one can only improve one property at the cost of the ... More
LoCuSS: Scaling relations between galaxy cluster mass, gas, and stellar contentJan 31 2019We present a simultaneous analysis of galaxy cluster scaling relations between weak-lensing mass and multiple cluster observables, across a wide range of wavelengths, that probe both gas and stellar content. Our new hierarchical Bayesian model simultaneously ... More
Learning Causality: Synthesis of Large-Scale Causal Networks from High-Dimensional Time Series DataMay 06 2019There is an abundance of complex dynamic systems that are critical to our daily lives and our society but that are hardly understood, and even with today's possibilities to sense and collect large amounts of experimental data, they are so complex and ... More
Generalized frieze pattern determinants and higher angulations of polygonsMay 06 2013Jun 16 2014Frieze patterns (in the sense of Conway and Coxeter) are in close connection to triangulations of polygons. Broline, Crowe and Isaacs have assigned a symmetric matrix to each polygon triangulation and computed the determinant. In this paper we consider ... More
Using DNNs to Detect Materials in a Room based on Sound AbsorptionJan 17 2019The materials of surfaces in a room play an important room in shaping the auditory experience within them. Different materials absorb energy at different levels. The level of absorption also varies across frequencies. This paper investigates how cues ... More
Chameleon $f(R)$ gravity on the Virgo cluster scaleAug 12 2014Models of modified gravity offer promising alternatives to the concordance $\Lambda$CDM cosmology to explain the late-time acceleration of the universe. A popular such model is $f(R)$ gravity, in which the Ricci scalar in the Einstein-Hilbert action is ... More
Crosscap numbers and the Jones polynomialAug 19 2014Sep 22 2015We give sharp two-sided linear bounds of the crosscap number (non-orientable genus) of alternating links in terms of their Jones polynomial. Our estimates are often exact and we use them to calculate the crosscap numbers for several infinite families ... More
Skew quasisymmetric Schur functions and noncommutative Schur functionsJul 06 2010Jul 22 2012Recently a new basis for the Hopf algebra of quasisymmetric functions $QSym$, called quasisymmetric Schur functions, has been introduced by Haglund, Luoto, Mason, van Willigenburg. In this paper we extend the definition of quasisymmetric Schur functions ... More
Three flavors of extremal Betti tablesJul 24 2012We discuss extremal Betti tables of resolutions in three different contexts. We begin over the graded polynomial ring, where extremal Betti tables correspond to pure resolutions. We then contrast this behavior with that of extremal Betti tables over regular ... More
Adjusting for Unmeasured Spatial Confounding with Distance Adjusted Propensity Score MatchingOct 24 2016Propensity score matching is a common tool for adjusting for observed confounding in observational studies, but is known to have limitations in the presence of unmeasured confounding. In many settings, researchers are confronted with spatially-indexed ... More
Pulsar Constraints on Screened Modified GravityJan 23 2013Jul 25 2014We calculate the rate of energy loss from compact astrophysical objects due to a scalar field in screened modified gravity models of the chameleon, dilaton and symmetron types. The cosmological evolution of the field results in a time-variation of the ... More
SUPER-ScreeningDec 18 2012We present a framework for embedding scalar-tensor models of screened modifed gravity such as chameleons, symmetrons and environmental dilatons into global supersymmetry. This achieved by secluding the dark sector from both the observable and supersymmetry ... More
Gravitational Mesoscopic Constraints in Cosmological Dark Matter HalosAug 23 2005We present an analysis of the behaviour of the `coarse-grained' (`mesoscopic') rank partitioning of the mean energy of collections of particles composing virialized dark matter halos in a Lambda-CDM cosmological simulation. We find evidence that rank ... More
Heuristics and Parse RankingAug 28 1995There are currently two philosophies for building grammars and parsers -- Statistically induced grammars and Wide-coverage grammars. One way to combine the strengths of both approaches is to have a wide-coverage grammar with a heuristic component which ... More
Environmental Lead-210 gamma-ray measurements in brain tumorsJun 25 2018In 2006 Mom\v{c}ilovi\'c et al. measured radioactvity levels of 210Po and 210Bi by alpha- and beta-measurements resp. to determine the natural distribuion of environmental radon daughters in the different brain areas of an Alzheimer Disease victim. We ... More
Global homotopy formulas on q-concave CR manifolds for large degreesDec 09 2008Using functional analysis and a Friedrichs approximation lemma for first order differential operators, we derive a global homotopy formula in large degrees for the tangential Cauchy-Riemann operator from local homotopy formulas without loss of regularity. ... More
Activités collectives et instrumentation. Étude de pratiques dans l'enseignement supérieurJun 17 2009This article presents the results of a study which concerns Instrumented Collective Learning Situations (ICLS) used in higher education and according to different actors's point of view (instructional designer and tutor). Considered actors have been involved ... More
Situations d'apprentissage collectives instrumentées : étude de pratiques dans l'enseignement supérieurJul 20 2007Currently, educational platforms propose many tools of communication, production, labour division or collective work management in order to support collective activities. But it is not guaranteed that actors (instructional designers, tutors or learner) ... More
Convergence Stability for Ricci FlowMay 01 2018The principle of convergence stability for geometric flows is the combination of the continuous dependence of the flow on initial conditions, with the stability of fixed points. It implies that if the flow from an initial state $g_0$ exists for all time ... More
Quantum thermalization via percolationJun 26 2014Feb 25 2015We highlight a dynamical anomaly in which the rate of relaxation towards thermal equilibrium in a bi-partite quantum system violates the standard linear-response (Kubo) formulation, even when the underlying dynamics is highly chaotic. This anomaly originates ... More
Second-Order Renormalization Group Flow of Three-Dimensional Homogeneous GeometriesMay 29 2012We study the behavior of the second order Renormalization Group flow on locally homogeneous metrics on closed three-manifolds. In the cases $\mathbb R^3$ and $\text{SO}(3)\times \R$, the flow is qualitatively the same as the Ricci flow. In the cases $\text{H}(3)$ ... More
On normalized Horn systemsJun 08 2018We characterize the (regular) holonomicity of Horn systems of differential equations under a hypothesis that captures the most widely studied classical hypergeometric systems.
End-to-End Classification of Reverberant Rooms using DNNsDec 21 2018Feb 09 2019Reverberation is present in our workplaces, our homes and even in places designed as auditoria, such as concert halls and theatres. This work investigates how deep learning can use the effect of reverberation on speech to classify a recording in terms ... More
Data Augmentation of Room Classifiers using Generative Adversarial NetworksJan 10 2019Feb 09 2019The classification of acoustic environments allows for machines to better understand the auditory world around them. The use of deep learning in order to teach machines to discriminate between different rooms is a new area of research. Similarly to other ... More
Herschel Exploitation of Local Galaxy Andromeda (HELGA) III: The Star Formation Law in M31Mar 25 2013We present a detailed study of how the Star Formation Rate (SFR) relates to the interstellar medium (ISM) of M31 at ~140pc scales. The SFR is calculated using the far-ultraviolet and 24um emission, corrected for the old stellar population in M31. We find ... More
$D \rightarrow Klν$ semileptonic decay using lattice QCD with HISQ at physical pion massesOct 19 2017The quark flavor sector of the Standard Model is a fertile ground to look for new physics effects through a unitarity test of the Cabbibo-Kobayashi-Maskawa (CKM) matrix. We present a lattice QCD calculation of the scalar and the vector form factors (over ... More
Imprints of Chameleon f(R) Gravity on Galaxy Rotation CurvesMay 30 2018Aug 14 2018Current constraints on gravity are relatively weak on galactic and intergalactic scales. Screened modified gravity models can exhibit complex behaviour there without violating stringent tests of gravity within our Solar System. They might hence provide ... More
Littlewood-Richardson rules for symmetric skew quasisymmetric Schur functionsOct 11 2014Aug 31 2015The classical Littlewood-Richardson rule is a rule for computing coefficients in many areas, and comes in many guises. In this paper we prove two Littlewood-Richardson rules for symmetric skew quasisymmetric Schur functions that are analogous to the famed ... More
Hypergeometric Functions for Projective Toric CurvesDec 12 2014Dec 02 2015We produce a decomposition of the parameter space of the $A$-hypergeometric system associated to a projective monomial curve as a union of an arrangement of lines and its complement, in such a way that the analytic behavior of the solutions of the system ... More
Brane World CosmologyApr 02 2004Recent developments in the physics of extra dimensions have opened up new avenues to test such theories. We review cosmological aspects of brane world scenarios such as the Randall--Sundrum brane model and two--brane systems with a bulk scalar field. ... More
Cosmic Acceleration in Massive Half-Maximal SupergravityNov 23 2004We consider massive half-maximal supergravity in (d+3) dimensions and compactify it on a symmetric three space. We find that the static configurations of Minkowski X S^3, obtained by balancing the positive scalar potential for the dilaton and the flux ... More
Concentration of research funding leads to decreasing marginal returnsFeb 24 2016In most countries, basic research is supported by research councils that select, after peer review, the individuals or teams that are to receive funding. Unfortunately, the number of grants these research councils can allocate is not infinite and, in ... More
Equivariant Multi-View NetworksApr 01 2019Several approaches to 3D vision tasks process multiple views of the input independently with deep neural networks pre-trained on natural images, achieving view permutation invariance through a single round of pooling over all views. We argue that this ... More
Multilevel Monte Carlo in Approximate Bayesian ComputationFeb 13 2017In the following article we consider approximate Bayesian computation (ABC) inference. We introduce a method for numerically approximating ABC posteriors using the multilevel Monte Carlo (MLMC). A sequential Monte Carlo version of the approach is developed ... More
Local rewiring algorithms to increase clustering and grow a small worldAug 09 2016Apr 11 2018Many real-world networks have high clustering among vertices: vertices that share neighbors are often also directly connected to each other. A network's clustering can be a useful indicator of its connectedness and community structure. Algorithms for ... More
The cone of Betti diagrams over a hypersurface ring of low embedding dimensionSep 23 2011Feb 20 2012We give a complete description of the cone of Betti diagrams over a standard graded hypersurface ring of the form k[x,y]/<q>, where q is a homogeneous quadric. We also provide a finite algorithm for decomposing Betti diagrams, including diagrams of infinite ... More
Dwarf galaxies in CDM and SIDM with baryons: observational probes of the nature of dark matterMay 20 2014Sep 20 2014We present the first cosmological simulations of dwarf galaxies, which include dark matter self-interactions and baryons. We study two dwarf galaxies within cold dark matter, and four different elastic self-interacting scenarios with constant and velocity-dependent ... More
Adaptive density estimation: a curse of support?Jul 10 2009This paper deals with the classical problem of density estimation on the real line. Most of the existing papers devoted to minimax properties assume that the support of the underlying density is bounded and known. But this assumption may be very difficult ... More
Anharmonic vibrational spectroscopy of Polycyclic Aromatic Hydrocarbons (PAHs)Sep 15 2018While powerful techniques exist to accurately account for anharmonicity in vibrational molecular spectroscopy, they are computationally very expensive and cannot be routinely employed for large species and/or at non- zero vibrational temperatures. Motivated ... More
Continuous Variable Quantum Information ProcessingAug 20 2010Observables of quantum systems can posses either a discrete or a continuous spectrum. For example, upon measurements of the photon number of a light state, discrete outcomes will result whereas measurements of the light's quadrature amplitudes result ... More
Comparison of an efficient implementation of gray molasses to narrow-line cooling for the all-optical production of a lithium quantum gasAug 21 2018We present an efficient scheme to implement a gray optical molasses for sub-Doppler cooling of $^{6}$Li atoms with minimum experimental overhead. To integrate the $D_1$ light for the gray molasses (GM) cooling into the same optical setup that is used ... More
Split Graphs and Nordhaus-Gaddum GraphsJun 11 2015A graph G is an NG-graph if \chi(G) + \chi(G complement) = |V(G)| + 1. We characterize NG-graphs solely from degree sequences leading to a linear-time recognition algorithm. We also explore the connections between NG-graphs and split graphs. There are ... More
Unsupervised Time Series Extraction from Controller Area Network PayloadsApr 05 2019This paper introduces a method for unsupervised tokenization of Controller Area Network (CAN) data payloads using bit level transition analysis and a greedy grouping strategy. The primary goal of this proposal is to extract individual time series which ... More
Conditional stability of particle alignment in finite-Reynolds-number channel flowOct 19 2018Finite-size neutrally buoyant particles in a channel flow are known to accumulate at specific equilibrium positions or spots in the channel cross-section if the flow inertia is finite at the particle scale. Experiments in different conduit geometries ... More
Product of two positive contractionsDec 13 2015Mar 22 2016Several characterizations are given for a square matrix that can be written as the product of two positive (semidefinite) projections. Based on one of these characterizations, and the theory of alternating projections, a Matlab program is written to check ... More
Stochastic quintessence models: jerk and fine-structure variability constraintsDec 17 2015We report on constraints to the cosmological jerk parameter ($j$) and to possible variability of the fine-structure constant ($\Delta \alpha/\alpha$) based on stochastic quintessence models of dark energy, discussed by Chongchitnan and Efstathiou (2007). ... More
Fundamental plane: dark matter and dissipation contributionsJun 09 2010Jul 08 2010Stellar and galactic systems are objects in dynamical equilibrium that are composed of ordinary baryonic matter hypothetically embedded in extended dominant dark matter halos. Our aim is to investigate the scaling relations and dissipational features ... More
The Spatial Distribution of Atomic Carbon Emission in the Giant Molecular Cloud NGC 604-2Feb 25 2000We have mapped a giant molecular cloud in the giant HII region NGC 604 in M33 in the 492 GHz ^3P_1 -- ^3P_0 transition of neutral atomic carbon using the James Clerk Maxwell Telescope. We find the distribution of the [CI] emission to be asymmetric with ... More
The Primordial Inflation Polarization Explorer (PIPER)Jul 09 2014The Primordial Inflation Polarization Explorer (PIPER) is a balloon-borne cosmic microwave background (CMB) polarimeter designed to search for evidence of inflation by measuring the large-angular scale CMB polarization signal. BICEP2 recently reported ... More
Qatar-2: A K dwarf orbited by a transiting hot Jupiter and a more massive companion in an outer orbitOct 26 2011We report the discovery and initial characterization of Qatar-2b, a hot Jupiter transiting a V = 13.3 mag K dwarf in a circular orbit with a short period, P_ b = 1.34 days. The mass and radius of Qatar-2b are M_p = 2.49 M_j and R_p = 1.14 R_j, respectively. ... More
The Effect of Galaxy Interactions on Molecular Gas PropertiesOct 24 2018Galaxy interactions are often accompanied by an enhanced star formation rate (SFR). Since molecular gas is essential for star formation, it is vital to establish whether, and by how much, galaxy interactions affect the molecular gas properties. We investigate ... More
Self-Verifying Variational Quantum Simulation of the Lattice Schwinger ModelOct 08 2018Apr 26 2019Hybrid classical-quantum algorithms aim at variationally solving optimisation problems, using a feedback loop between a classical computer and a quantum co-processor, while benefitting from quantum resources. Here we present experiments demonstrating ... More
Impact of spatially correlated pore-scale heterogeneity on drying porous mediaDec 03 2016May 03 2017We study the effect of spatially-correlated heterogeneity on isothermal drying of porous media. We combine a minimal pore-scale model with microfluidic experiments with the same pore geometry. Our simulated drying behavior compare favorably with experiments, ... More