Results for "E. Turk"

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p-Laplacian Fractional Sturm-Liouville Problem for Diffusion Operator via Impulsive ConditionFeb 05 2018In this study, the existence results of solution is given for fractional p-Laplacian Stum-Liouville problem for diffusion operator of order with impulsive conditions. The derivatives are described in Riemann-Liouville and Caputo sense. The Riemann-Liouville ... More
A Novel Data Encryption Algorithm Design and Implementation in Information Security ScopeFeb 09 2019Today, the protection of information, ensuring of the safety and the recall in lossless in case of need is highly significant and it is seen as a major threat in the field. Information security is possible by hiding the available data, by encrypting, ... More
Anisotropy in finite continuum percolation: Threshold estimation by Minkowski functionalsJan 13 2017We examine the interplay between anisotropy and percolation, i.e., the spontaneous formation of a system spanning cluster in an anisotropic model. We simulate an extension of a benchmark model of continuum percolation, the Boolean model, which is formed ... More
Curvature driven motion of soap cells in toroidal Hele-Shaw cellsOct 28 2016Apr 04 2017We investigate the equilibrium properties of a single area-minimising bubble trapped between two narrowly-separated parallel curved plates. We begin with the simple case of a a bubble trapped between concentric spherical plates. We develop a model that ... More
Curvature driven motion of soap cells in toroidal Hele-Shaw cellsOct 28 2016Nov 10 2016We investigate the equilibrium properties of a single area-minimising bubble trapped between two narrowly-separated parallel curved plates. We begin with the simple case of a a bubble trapped between concentric spherical plates. We develop a model that ... More
Curvature driven motion of soap cells in toroidal Hele-Shaw cellsOct 28 2016We investigate the equilibrium properties of a single area-minimising bubble trapped between two narrowly-separated parallel curved plates. We begin with the simple case of a a bubble trapped between concentric spherical plates. We develop a model that ... More
Modeling Collaboration for Robot-assisted Dressing TasksSep 14 2019We investigated the application of haptic aware feedback control and deep reinforcement learning to robot assisted dressing in simulation. We did so by modeling both human and robot control policies as separate neural networks and training them both via ... More
Network-like propagation of cell-level stress in random foamsMay 03 2013Quasistatic simple shearing flow of random monodisperse soap froth is investigated by analyzing Surface Evolver simulations of spatially periodic foams. Elastic-plastic behavior is caused by irreversible topological rearrangements (T1s) that occur when ... More
Jammed Spheres: Minkowski Tensors Reveal Onset of Local CrystallinityJan 31 2012Apr 11 2012The local structure of disordered jammed packings of monodisperse spheres without friction, generated by the Lubachevsky-Stillinger algorithm, is studied for packing fractions above and below 64%. The structural similarity of the particle environments ... More
Electro-stimulation of Saccharomyces cerevisiae wine yeasts by Pulsed Electric Field and its effect on fermentation performanceApr 21 2013Jun 15 2013The batch fermentation process, inoculated by pulsed electric field (PEF) treated wine yeasts (S. cerevisiae Actiflore F33), was studied. PEF treatment was applied to the aqueous yeast suspensions (0.12 % wt.) at the electric field strengths of E=100 ... More
Patchy particles by self-assembly of star copolymers on a spherical substrate: Thomson solutions in a geometric problem with a color constraintJul 18 2019Confinement or geometric frustration is known to alter the structure of soft matter, including copolymeric melts, and can consequently be used to tune structure and properties. Here we investigate the self-assembly of ABC and ABB 3-miktoarm star copolymers ... More
Local origin of global contact numbers in frictional ellipsoid packingsDec 04 2013Mar 13 2015In particulate soft matter systems the average number of contacts $Z$ of a particle is an important predictor of the mechanical properties of the system. Using X-ray tomography, we analyze packings of frictional, oblate ellipsoids of various aspect ratios ... More
Percolation transition by random vertex splitting of diamond networks?Oct 15 2013We propose a statistical model defined on the three-dimensional diamond network where the splitting of randomly selected nodes leads to a spatially disordered network, with decreasing degree of connectivity. The terminal state, that is reached when all ... More
Generative adversarial network for segmentation of motion affected neonatal brain MRIJun 11 2019Automatic neonatal brain tissue segmentation in preterm born infants is a prerequisite for evaluation of brain development. However, automatic segmentation is often hampered by motion artifacts caused by infant head movements during image acquisition. ... More
Patchy particles by self-assembly of star copolymers on a spherical substrate: Thomson solutions in a geometric problem with a color constraintJul 18 2019Jul 19 2019Confinement or geometric frustration is known to alter the structure of soft matter, including copolymeric melts, and can consequently be used to tune structure and properties. Here we investigate the self-assembly of ABC and ABB 3-miktoarm star copolymers ... More
Permeability of porous materials determined from the Euler characteristicNov 29 2012We study the permeability of quasi two-dimensional porous structures of randomly placed overlapping monodisperse circular and elliptical grains. Measurements in microfluidic devices and lattice Boltzmann simulations demonstrate that the permeability is ... More
Splitting of the universality class of anomalous transport in crowded mediaJan 22 2016We investigate the emergence of subdiffusive transport by obstruction in continuum models for molecular crowding. While the underlying percolation transition for the accessible space displays universal behavior, the dynamic properties depend in a subtle ... More
Pomelo, a tool for computing Generic Set Voronoi Diagrams of Aspherical Particles of Arbitrary ShapeMar 10 2017We describe the development of a new software tool, called "Pomelo", for the calculation of Set Voronoi diagrams. Voronoi diagrams are a spatial partition of the space around the particles into separate Voronoi cells, e.g. applicable to granular materials. ... More
Space-resolved dynamics of a tracer in a disordered solidApr 21 2010The dynamics of a tracer particle in a glassy matrix of obstacles displays slow complex transport as the free volume approaches a critical value and the void space falls apart. We investigate the emerging subdiffusive motion of the test particle by extensive ... More
Geometric effects in random assemblies of ellipsesMay 28 2019Assemblies of anisotropic particles commonly appear in studies of active many-body systems. However, in two dimensions, the geometric ramifications of the finite density of such objects are not entirely understood. To fully characterize these effects, ... More
Symmetry detection of auxetic behaviour in 2D frameworksMay 24 2013A symmetry-extended Maxwell treatment of the net mobility of periodic bar-and-joint frameworks is used to derive a sufficient condition for auxetic behaviour of a 2D material. The type of auxetic behaviour that can be detected by symmetry has Poisson's ... More
Shortcomings of the Bond Orientational Order Parameters for the Analysis of Disordered Particulate MatterSep 27 2012Dec 14 2012Local structure characterization with the bond-orientational order parameters q4, q6, ... introduced by Steinhardt et al. has become a standard tool in condensed matter physics, with applications including glass, jamming, melting or crystallization transitions ... More
Saturated nucleate pool boiling of oxygen under magnetically-enhanced effective gravityFeb 01 2007We investigate the effect of enhancing gravity on saturated nucleate pool boiling of oxygen for effective gravities of 1g, 6.0g, and 16g (g=9.8 m/s^2) at a saturation pressure of 760 torr and for heat fluxes of 10 ~ 3000 W/m^2. The effective gravity on ... More
Group Theory of Circular-Polarization Effects in Chiral Photonic Crystals with Four-Fold Rotation Axes, Applied to the Eight-Fold Intergrowth of Gyroid NetsSep 11 2013We use group or representation theory and scattering matrix calculations to derive analytical results for the band structure topology and the scattering parameters, applicable to any chiral photonic crystal with body-centered cubic symmetry I432 for circularly-polarised ... More
Group Theory of Chiral Photonic Crystals with 4-fold Symmetry: Band Structure and S-Parameters of Eight-Fold Intergrown Gyroid NetsSep 11 2013The Single Gyroid, or srs, nanostructure has attracted interest as a circular-polarisation sensitive photonic material. We develop a group theoretical and scattering matrix method, applicable to any photonic crystal with symmetry I432, to demonstrate ... More
Cell shape analysis of random tessellations based on Minkowski tensorsJun 24 2016To which degree are shape indices of individual cells of a tessellation characteristic for the stochastic process that generates them? Within the context of stochastic geometry and the physics of disordered materials, this corresponds to the question ... More
On the Impact of Satellite Communications over Mobile Networks: An Experimental AnalysisMar 21 2019Future telecommunication systems are expected to co-exist with different backhauling nodes such as terrestrial or satellite systems. Satellite connectivity can add flexibility to backhauling networks and provide an alternative route for transmission. ... More
Dark Sky Simulations: Early Data ReleaseJul 09 2014The Dark Sky Simulations are an ongoing series of cosmological N-body simulations designed to provide a quantitative and accessible model of the evolution of the large-scale Universe. Such models are essential for many aspects of the study of dark matter ... More
How to Scale a Code in the Human DimensionJan 29 2013As scientists' needs for computational techniques and tools grow, they cease to be supportable by software developed in isolation. In many cases, these needs are being met by communities of practice, where software is developed by domain scientists to ... More
Temporal Registration in In-Utero Volumetric MRI Time SeriesAug 12 2016We present a robust method to correct for motion and deformations for in-utero volumetric MRI time series. Spatio-temporal analysis of dynamic MRI requires robust alignment across time in the presence of substantial and unpredictable motion. We make a ... More
Minkowski Tensors of Anisotropic Spatial StructureSep 13 2010Aug 06 2013This article describes the theoretical foundation of and explicit algorithms for a novel approach to morphology and anisotropy analysis of complex spatial structure using tensor-valued Minkowski functionals, the so-called Minkowski tensors. Minkowski ... More
Appearance of the Single Gyroid Network Phase in Nuclear Pasta MatterApr 18 2014Oct 31 2014Nuclear matter under the conditions of a supernova explosion unfolds into a rich variety of spatially structured phases, called nuclear pasta. We investigate the role of periodic network-like structures with negatively curved interfaces in nuclear pasta ... More
Collins Effect from Polarized SIDIS and $e^+e^-$ DataDec 07 2006The recent data on the transverse single spin asymmetry $A_{UT}^{\sin(\phi_h+\phi_S)}$ from HERMES and COMPASS Collaborations are analysed within LO parton model with unintegrated parton distribution and fragmentation functions. A fit of SIDIS data from ... More
A Comparison of Adaptive and Template Matching Techniques for Radio-Isotope IdentificationAug 26 2019We compare and contrast the effectiveness of a set of adaptive and non-adaptive algorithms for isotope identification based on gamma-ray spectra. One dimensional energy spectra are simulated for a variety of dwell-times and source to detector distances ... More
Bilgisayar Muhendisligi Egitiminde Teknoloji Egilimlerinin Takip EdilmesiJul 19 2018Oct 31 2018Today computers have become an integral part of life. However, most people's interaction with computers in on end-user-level. Computer engineers are needed while designing and developing a structure of computer systems, software and hardware systems and ... More
Local Anisotropy of Fluids using Minkowski TensorsSep 03 2010Oct 15 2010Statistics of the free volume available to individual particles have previously been studied for simple and complex fluids, granular matter, amorphous solids, and structural glasses. Minkowski tensors provide a set of shape measures that are based on ... More
Automatic brain tissue segmentation in fetal MRI using convolutional neural networksJun 11 2019MR images of fetuses allow clinicians to detect brain abnormalities in an early stage of development. The cornerstone of volumetric and morphologic analysis in fetal MRI is segmentation of the fetal brain into different tissue classes. Manual segmentation ... More
Cyberinfrastructure Requirements to Enhance Multi-messenger AstrophysicsMar 11 2019The identification of the electromagnetic counterpart of the gravitational wave event, GW170817, and discovery of neutrinos and gamma-rays from TXS 0506+056 heralded the new era of multi-messenger astrophysics. As the number of multi-messenger events ... More
On the effect of Ti on Oxidation Behaviour of a Polycrystalline Nickel-based SuperalloyOct 24 2018Titanium is commonly added to nickel superalloys but has a well-documented detrimental effect on oxidation resistance. The present work constitutes the first atomistic-scale quantitative measurements of grain boundary and bulk compositions in the oxide ... More
An empirical Bayesian analysis applied to the globular cluster pulsar populationSep 27 2013Aug 16 2014We describe an empirical Bayesian approach to determine the most likely size of an astronomical population of sources of which only a small subset are observed above some limiting flux density threshold. The method is most naturally applied to astronomical ... More
Least reliable messages based early termination method for LT soft decoderDec 16 2016In this paper, we propose a new early termination method (ETM) for Luby transform (LT) belief propagation (BP) decoder. The proposed ETM, which we call least reliable messages (LRM), observes only sign alterations of a small cluster in log-likelihood ... More
Multi-task Learning with Gradient Guided Policy SpecializationSep 23 2017Mar 02 2018We present a method for efficient learning of control policies for multiple related robotic motor skills. Our approach consists of two stages, joint training and specialization training. During the joint training stage, a neural network policy is trained ... More
Learning Symmetric and Low-energy LocomotionJan 24 2018May 12 2018Learning locomotion skills is a challenging problem. To generate realistic and smooth locomotion, existing methods use motion capture, finite state machines or morphology-specific knowledge to guide the motion generation algorithms. Deep reinforcement ... More
Learning Novel Policies For TasksMay 13 2019In this work, we present a reinforcement learning algorithm that can find a variety of policies (novel policies) for a task that is given by a task reward function. Our method does this by creating a second reward function that recognizes previously seen ... More
Assumptions Underlying Agile Software Development ProcessesSep 22 2014Agile processes focus on facilitating early and fast production of working code, and are based on software development process models that support iterative, incremental development of software. Although agile methods have existed for a number of years ... More
Policy Transfer with Strategy OptimizationOct 12 2018Dec 04 2018Computer simulation provides an automatic and safe way for training robotic control policies to achieve complex tasks such as locomotion. However, a policy trained in simulation usually does not transfer directly to the real hardware due to the differences ... More
Fractal Heterogeneous MediaDec 07 2009A method is proposed for generating compact fractal disordered media, by generalizing the random midpoint displacement algorithm. The obtained structures are invasive stochastic fractals, with the Hurst exponent varying as a continuous parameter, as opposed ... More
The Fiber Walk: A Model of Tip-Driven Growth with Lateral ExpansionApr 12 2013Dec 29 2013Tip-driven growth processes underlie the development of many plants. To date, tip-driven growth processes have been modelled as an elongating path or series of segments without taking into account lateral expansion during elongation. Instead, models of ... More
Non-universal Voronoi cell shapes in amorphous ellipsoid packingsApr 10 2015In particulate systems with short-range interactions, such as granular matter or simple fluids, local structure plays a pivotal role in determining the macroscopic physical properties. Here, we analyse local structure metrics derived from the Voronoi ... More
Limitations of Agile Software ProcessesSep 22 2014Software developers and project managers are struggling to assess the appropriateness of agile processes to their development environments. This paper identifies limitations that apply to many of the published agile processes in terms of the types of ... More
Learning Symmetry and Low-energy LocomotionJan 24 2018Jan 25 2018Learning locomotion skills is a challenging problem. To generate realistic and smooth locomotion, existing methods use motion capture, finite state machines or morphology-specific knowledge to guide the motion generation algorithms. Deep reinforcement ... More
High-Performance Astrophysical Simulations and Analysis with PythonDec 19 2011The usage of the high-level scripting language Python has enabled new mechanisms for data interrogation, discovery and visualization of scientific data. We present yt, an open source, community-developed astrophysical analysis and visualization toolkit ... More
How bees and foams respond to curved confinement: level set boundary representations in the Surface EvolverNov 30 2016We present a Surface Evolver framework for simulating single bubbles and multicellular foams trapped between curved parallel surfaces. We are able to explore a range of geometries using level set constraints to model the bounding surfaces. Unlike previous ... More
Structural similarity between dry and wet sphere packingsAug 13 2018Jan 22 2019The mechanical properties of granular materials change significantly in the presence of a wetting liquid which creates capillary bridges between the particles. Here we demonstrate, using X-ray tomographies of dry and wet sphere packings, that this change ... More
Automatic segmentation of the intracranialvolume in fetal MR imagesJul 31 2017MR images of the fetus allow non-invasive analysis of the fetal brain. Quantitative analysis of fetal brain development requires automatic brain tissue segmentation that is typically preceded by segmentation of the intracranial volume (ICV). This is challenging ... More
Seamless Rate Adaptation at Receiver Side for Indoor Visible Light Communications by Using Raptor CodesFeb 12 2019Visible light communication (VLC), which uses LEDs for both illumination and communication purposes, has recently emerged as either an alternative or a support system for radio frequency (RF) communication. VLC channel inside a room is highly variable ... More
One-Class Slab Support Vector MachineAug 02 2016This work introduces the one-class slab SVM (OCSSVM), a one-class classifier that aims at improving the performance of the one-class SVM. The proposed strategy reduces the false positive rate and increases the accuracy of detecting instances from novel ... More
Sim-to-Real Transfer for Biped LocomotionMar 04 2019We present a new approach for transfer of dynamic robot control policies such as biped locomotion from simulation to real hardware. Key to our approach is to perform system identification of the model parameters {\mu} of the hardware (e.g. friction, center-of-mass) ... More
Magnetic Fields in Population III Star FormationDec 19 2011We study the buildup of magnetic fields during the formation of Population III star-forming regions, by conducting cosmological simulations from realistic initial conditions and varying the Jeans resolution. To investigate this in detail, we start simulations ... More
Constraints on Hydrodynamical Subgrid Models from Quasar Absorption Line Studies of the Simulated Circumgalactic MediumDec 12 2012Cosmological hydrodynamical simulations of galaxy evolution are increasingly able to produce realistic galaxies, but the largest hurdle remaining is in constructing subgrid models that accurately describe the behavior of stellar feedback. As an alternate ... More
Critique of an Experiment Regarding Quantum States in a Gravitational Field and Possible Geometrical ExplanationsJun 06 2002We discuss an experiment conducted by Nesvizhevsky et al. As it is the first experiment claimed to have observed gravitational quantum states, it is imperative to investigate all alternative explanations of the result. In a student project course in applied ... More
Machine Learning and Cosmological Simulations II: Hydrodynamical SimulationsOct 26 2015Jan 12 2016We extend a machine learning (ML) framework presented previously to model galaxy formation and evolution in a hierarchical universe using N-body + hydrodynamical simulations. In this work, we show that ML is a promising technique to study galaxy formation ... More
Semi-Inclusive Deep Inelastic Scattering processes from small to large P_TJun 28 2006We consider the azimuthal and $P_T$ dependence of hadrons produced in unpolarized Semi-Inclusive Deep Inelastic Scattering (SIDIS) processes, within the factorized QCD parton model. It is shown that at small $P_T$ values, $P_T \lsim 1$ GeV/c, lowest order ... More
Snow metamorphism: a fractal approachDec 21 2010Snow is a porous disordered medium consisting of air and three water phases: ice, vapour and liquid. The ice phase consists of an assemblage of grains, ice matrix, initially arranged over a random load bearing skeleton. The quantitative relationship between ... More
ANSAC: Adaptive Non-minimal Sample and ConsensusSep 27 2017While RANSAC-based methods are robust to incorrect image correspondences (outliers), their hypothesis generators are not robust to correct image correspondences (inliers) with positional error (noise). This slows down their convergence because hypotheses ... More
Using Convolutional Neural Networks for Determining Reticulocyte Percentage in CatsMar 13 2018Mar 14 2018Recent advances in artificial intelligence (AI), specifically in computer vision (CV) and deep learning (DL), have created opportunities for novel systems in many fields. In the last few years, deep learning applications have demonstrated impressive results ... More
Preparing for the Unknown: Learning a Universal Policy with Online System IdentificationFeb 08 2017May 15 2017We present a new method of learning control policies that successfully operate under unknown dynamic models. We create such policies by leveraging a large number of training examples that are generated using a physical simulator. Our system is made of ... More
The Formation of Population III Binaries from Cosmological Initial ConditionsJul 16 2009Previous high resolution cosmological simulations predict the first stars to appear in the early universe to be very massive and to form in isolation. Here we discuss a cosmological simulation in which the central 50 solar mass clump breaks up into two ... More
Resolving the Formation of Protogalaxies. II. Central Gravitational CollapseOct 09 2007Mar 26 2008Numerous cosmological hydrodynamic studies have addressed the formation of galaxies. Here we choose to study the first stages of galaxy formation, including non-equilibrium atomic primordial gas cooling, gravity and hydrodynamics. Using initial conditions ... More
High-Entropy Polar Regions Around the First ProtostarsOct 28 2010We report on simulations of the formation of the first stars in the Universe, where we identify regions of hot atomic gas (fH2 < 10-6) at densities above 10-14 g/cc, heated to temperatures ranging between 3000 and 8000 K. Within this temperature range ... More
Sim-to-Real Transfer for Biped LocomotionMar 04 2019Aug 25 2019We present a new approach for transfer of dynamic robot control policies such as biped locomotion from simulation to real hardware. Key to our approach is to perform system identification of the model parameters {\mu} of the hardware (e.g. friction, center-of-mass) ... More
Large Scale SfM with the Distributed Camera ModelJul 13 2016We introduce the distributed camera model, a novel model for Structure-from-Motion (SfM). This model describes image observations in terms of light rays with ray origins and directions rather than pixels. As such, the proposed model is capable of describing ... More
Machine Learning and Cosmological Simulations I: Semi-Analytical ModelsOct 21 2015We present a new exploratory framework to model galaxy formation and evolution in a hierarchical universe by using machine learning (ML). Our motivations are two-fold: (1) presenting a new, promising technique to study galaxy formation, and (2) quantitatively ... More
Single Production of Fourth Family Quarks at the LHCJan 02 2008Feb 11 2008We study the single production of the fourth family quarks through the process pp--> Q'jX at the Large Hadron Collider (LHC). We have calculated the decay widths and branching ratios of the fourth family quarks (b' and t') in the mass range 300-800 GeV. ... More
Large Scale SfM with the Distributed Camera ModelJul 13 2016Dec 01 2016We introduce the distributed camera model, a novel model for Structure-from-Motion (SfM). This model describes image observations in terms of light rays with ray origins and directions rather than pixels. As such, the proposed model is capable of describing ... More
First measurement of the Head-Tail directional nuclear recoil signature at energies relevant to WIMP dark matter searchesSep 10 2008We present first evidence for the so-called Head-Tail asymmetry signature of neutron-induced nuclear recoil tracks at energies down to 1.5 keV/amu using the 1m^3 DRIFT-IIc dark matter detector. This regime is appropriate for recoils induced by Weakly ... More
Measurement of the Range Component Directional Signature in a DRIFT-II Detector using 252Cf NeutronsJul 24 2008The DRIFT collaboration utilizes low pressure gaseous detectors to search for WIMP dark matter with directional signatures. A 252Cf neutron source was placed on each of the principal axes of a DRIFT detector in order to test its ability to measure directional ... More
Low Energy Electron and Nuclear Recoil Thresholds in the DRIFT-II Negative Ion TPC for Dark Matter SearchesMar 02 2009Mar 30 2009Understanding the ability to measure and discriminate particle events at the lowest possible energy is an essential requirement in developing new experiments to search for weakly interacting massive particle (WIMP) dark matter. In this paper we detail ... More
Track Reconstruction and Performance of DRIFT Directional Dark Matter Detectors using Alpha ParticlesJul 12 2007First results are presented from an analysis of data from the DRIFT-IIa and DRIFT-IIb directional dark matter detectors at Boulby Mine in which alpha particle tracks were reconstructed and used to characterise detector performance--an important step towards ... More
First Results from the DRIFT-IIa Dark Matter DetectorJul 10 2007Data from the DRIFT-IIa directional dark matter experiment are presented, collected during a near continuous 6 month running period. A detailed calibration analysis comparing data from gamma-ray, x-ray and neutron sources to a GEANT4 Monte Carlo simulations ... More
Placental Flattening via Volumetric ParameterizationMar 12 2019We present a volumetric mesh-based algorithm for flattening the placenta to a canonical template to enable effective visualization of local anatomy and function. Monitoring placental function in vivo promises to support pregnancy assessment and to improve ... More
Face Verification in Polar Frequency Domain: a Biologically Motivated ApproachSep 27 2005We present a novel local-based face verification system whose components are analogous to those of biological systems. In the proposed system, after global registration and normalization, three eye regions are converted from the spatial to polar frequency ... More
CHIPS: A Service for Collecting, Organizing, Processing, and Sharing Medical Image Data in the CloudOct 02 2017Web browsers are increasingly used as middleware platforms offering a central access point for service provision. Using backend containerization, RESTful APIs, and distributed computing allows for complex systems to be realized that address the needs ... More
Placental Flattening via Volumetric ParameterizationMar 12 2019Mar 14 2019We present a volumetric mesh-based algorithm for flattening the placenta to a canonical template to enable effective visualization of local anatomy and function. Monitoring placental function in vivo promises to support pregnancy assessment and to improve ... More
The Birth of a Galaxy: Primordial Metal Enrichment and Stellar PopulationsNov 11 2010Nov 30 2011By definition, Population III stars are metal-free, and their protostellar collapse is driven by molecular hydrogen cooling in the gas-phase, leading to large characteristic masses. Population II stars with lower characteristic masses form when the star-forming ... More
Temporal Registration in Application to In-utero MRI Time SeriesMar 06 2019We present a robust method to correct for motion in volumetric in-utero MRI time series. Time-course analysis for in-utero volumetric MRI time series often suffers from substantial and unpredictable fetal motion. Registration provides voxel correspondences ... More
Transversity and Collins Functions: from e+ e- --> h1 h2 X to SIDIS ProcessesJul 09 2007We present [1] the first simultaneous extraction of the transversity distribution and the Collins fragmentation function, obtained through a combined analysis of experimental data on azimuthal asymmetries in semi-inclusive deep inelastic scattering (SIDIS), ... More
Parallel HOP: A Scalable Halo Finder for Massive Cosmological Data SetsJan 19 2010Jun 17 2010Modern N-body cosmological simulations contain billions ($10^9$) of dark matter particles. These simulations require hundreds to thousands of gigabytes of memory, and employ hundreds to tens of thousands of processing cores on many compute nodes. In order ... More
A chiral family of triply-periodic minimal surfaces derived from the quartz networkMay 18 2018We describe a new family of triply-periodic minimal surfaces with hexagonal symmetry, related to the quartz (qtz) and its dual (the qzd net). We provide a solution to the period problem and provide a parametrisation of these surfaces, that are not in ... More
The Birth of a Galaxy. II. The Role of Radiation PressureJun 05 2012Jul 26 2012Massive stars provide feedback that shapes the interstellar medium of galaxies at all redshifts and their resulting stellar populations. Here we present three adaptive mesh refinement radiation hydrodynamics simulations that illustrate the impact of momentum ... More
Transversity and Collins functions from SIDIS and e+e- dataJan 02 2007Mar 28 2007A global analysis of the experimental data on azimuthal asymmetries in semi-inclusive deep inelastic scattering (SIDIS), from the HERMES and COMPASS Collaborations, and in e+e- --> h1 h2 X processes, from the BELLE Collaboration, is performed. It results ... More
Deep Haptic Model Predictive Control for Robot-Assisted DressingSep 27 2017Oct 27 2017Robot-assisted dressing offers an opportunity to benefit the lives of many people with disabilities, such as some older adults. However, robots currently lack common sense about the physical implications of their actions on people. The physical implications ... More
Multidimensional Capacitive Sensing for Robot-Assisted Dressing and BathingApr 03 2019Robotic assistance presents an opportunity to benefit the lives of many adults with physical disabilities, yet accurately sensing the human body and tracking human motion remain difficult for robots. We present a multidimensional capacitive sensing technique ... More
Probing the Effects of Dimension-eight Operators Describing Anomalous Neutral Triple Gauge Boson Interactions at FCC-hhMay 09 2018Sep 04 2018The effects of dimension-eight operators giving rise to anomalous neutral triple gauge boson interactions of $Z\gamma\gamma$ and $Z\gamma Z$ vertices in $pp\to l^-l^+\gamma$ and $pp\to \nu\bar \nu \gamma$ are investigated at 100 TeV centre of mass energy ... More
Study on Anomalous Neutral Triple Gauge Boson Couplings from Dimension-eight Operators at the HL-LHCJun 11 2019The anomalous neutral triple gauge boson couplings (aNTGCs) for the Z gamma gamma and Z gamma Z vertices described by dimension-eight operators are examined through the process pp to l^{+}l^{-} gamma at the High-Luminosity Large Hadron Collider (HL-LHC). ... More
Learning to Navigate Cloth using HapticsMar 20 2017Jul 31 2017We present a controller that allows an arm-like manipulator to navigate deformable cloth garments in simulation through the use of haptic information. The main challenge of such a controller is to avoid getting tangled in, tearing or punching through ... More
What Should I Ask? Using Conversationally Informative Rewards for Goal-Oriented Visual DialogJul 28 2019The ability to engage in goal-oriented conversations has allowed humans to gain knowledge, reduce uncertainty, and perform tasks more efficiently. Artificial agents, however, are still far behind humans in having goal-driven conversations. In this work, ... More
Threat determination for radiation detection from the Remote Sensing LaboratoryAug 27 2019The ability to search for radiation sources is of interest to the Homeland Security community. The hope is to find any radiation sources which may pose a reasonable chance for harm in a terrorist act. The best chance of success for search operations generally ... More
Anomalous transport of a tracer on percolating clustersDec 02 2010We investigate the dynamics of a single tracer exploring a course of fixed obstacles in the vicinity of the percolation transition for particles confined to the infinite cluster. The mean-square displacement displays anomalous transport, which extends ... More
Population III Star Formation In Large Cosmological Simulations I. Halo Temporal and Physical EnvironmentJun 19 2013We present a semi-analytic, computationally inexpensive model to identify halos capable of forming a Population III star in cosmological simulations across a wide range of times and environments. This allows for a much more complete and representative ... More