cometadata/datacite-rtg-text-other-reclassification-records huggingface dataset:
Doppler coherence imaging of ion flows and temperatures in the MAGPIE helicon plasma
Creators: name: Lester, Romana
Publisher: name: The Australian National University
Year: 2019

description: A snapshot coherence imaging system has been designed to measure brightness, flows and temperatures for argon ions in a helicon plasma with expected ion temperatures of ~1 eV and subsonic ion flows less than 1000 m/s. This technique measures Doppler information from the 488 nm ion spectral line, and encodes this information in the phase and contrast of an interferogram. Taking into account line-of-sight effects, demodulation of the interferogram yields a 2D spatial map of the ion temperatures and flows. At these plasma conditions, large interferometric delays (greater than 10^4 waves) are necessary to resolve the Doppler features. Passive stabilisation and an automated online calibration system was used to counteract thermally-induced phase drifts in the birefringent delay plates. The design features of this device are presented here. Measurements are presented of the ion brightness, flows and temperatures in the MAGnetised Plasma Interaction Experiment (MAGPIE) for an argon plasma at 3 mTorr gas pressure, forward power of 1 kW and a 0.08 T peak magnetic field (in a magnetic pinch configuration). Spatial scans taken longitudinally along the chamber shows the peak brightness occurs in the high magnetic field region and the radial profile is centrally peaked with secondary wing-like features. There are also high ion temperatures in the plasma edge which indicate a secondary ion heating mechanism. In the magnetic pinch region the azimuthal ion flows are largest and the axial ion flows show a flow reversal. Measurements of the brightness, ion temperature and ion flows are also examined over a range of magnetic field configurations and gas pressures and ion flow measurements are confirmed using a Mach probe. The results of this study demonstrate that, with careful consideration to instrument design, coherence imaging can be used to study ion features in cold plasmas. This opens opportunities for measurements of ion dynamics in laboratory-based plasmas across a range of research areas.
Gluon density and $F_{2}$ functions from BK equation with impact parameter dependence
Creators: name: Bondarenko, Sergey
Publisher: name: arXiv
Year: 2008
Subjects: subject: High Energy Physics - Phenomenology (hep-ph)
subject: FOS: Physical sciences

description: In this note we fix the preliminary results obtained in the study of gluon density function of the paper \cite{bom3}. The LO BK equation for unintegrated gluon density with impact parameter dependence is considered in order to fix the parameters of the proposed model. In particular the form of initial condition for the equations of proton-proton scattering from \cite{bom3} is determined, which is similar to the form of fenomenological GBW ansatz. The gluon density function and $F_{2}$ function are also calculated and compared with the results for the gluon density and $F_{2}$ functions from the GRV parameterization for different values of $Q^2$. It is shown, that the results for $F_2$ structure function of the considered model are in the good accordance with the results obtained from the GRV parameterization of parton densities.
description: 10 pages, 3 figures
Coffee Lectures, Forschungsdatenmanagement (ab April 2021). Übersicht. Immer an einem Mittwoch um 12:30 Uhr.
Creators: name: Strauch, Annette
Publisher: name: Zenodo
Year: 2021
Subjects: UB Hildesheim
Bibliotheken
Universitätsbibliotheken
Forschungsnahe Dienste

description: Forscherinnen und Forscher sollten „den kompletten Forschungsprozess dokumentieren“. Der Umgang mit Forschungsdaten ist essentiell für die wissenschaftliche Tätigkeit.  In den „Coffee Lectures“ kommen Studierende, Forscherinnen und Forscher mit Expertinnen und Experten aus der Fachcommunity und anderen Vertretern der Universitäten und externen Fachleuten zusammen. Wir haben das praxisbezogene, fächerübergreifende, fachspezifische und auch generische FDM im Blick. Also all das, was den größten Nutzen und Mehrwert (nicht Mehrarbeit!) für Forscherinnen und Forscher bringt. In der Praxis sollen es Muster sein, Workflows, Fallbeispiele und Standards, zum Beispiel Metadatenstandards. Die „Coffee Lectures“ (Dauer etwa 40 Minuten) und Workshops finden mehrmals im Semester statt. Eine Anmeldung ist nicht erforderlich.
 Alle Veranstaltungen werden aufgrund der aktuellen Corona-Infektionslage DIGITAL übertragen.
 Wo? Über das Tool BBB, siehe Veranstaltungskalender der SUH: www.uni-hildesheim.de/veranstaltungen/veranstaltungskalender/ Der erste Beitrag wird von Herrn Prof. Dr. York Sure-Vetter (KIT, Direktor der NFDI, Karlsruhe) gestaltet.
title: Εφαρμογές Μη επανδρωμένων αεροσκαφών στον ηλεκτρονικό πόλεμο – Επικοινωνία μεταξύ σμήνους Μη επανδρωμένων αεροσκαφών και εντοπισμός ηλεκτρομαγνητικών εκπομπών
title: Unmanned aerial vehicle applications in electronic warfare – Drone swarms communication and electromagnetic emission detection
Creators: name: Μπιτζης Αλεξανδρος
Publisher: name: Technical University of Crete
Year: 2022

description: Η ανάπτυξη των Μη Επανδρωμένων Αεροσκαφών και η εφαρμογή τους τόσο σε πολιτικό όσο και στρατιωτικό επίπεδο έχουν επιφέρει μεγάλο επιστημονικό ενδιαφέρον. Στον στρατιωτικό τομέα τόσο οι σύγχρονες μορφές πολέμου (Δικτυοκεντρικός Πόλεμος) όσο και η επιθυμία μείωσης του κόστους σε ανθρώπινες ζωές έχει οδηγήσει στην ανάπτυξη μη επανδρωμένων μέσων και ευφυών συστημάτων, ώστε να επιτευχθούν αυτοί οι στόχοι. Σκοπός της παρούσας εργασίας είναι η μελέτη εφαρμογών Ηλεκτρονικού Πολέμου μέσω Μη Επανδρωμένου Αεροσκάφους η Σμήνους Μη Επανδρωμένων Αεροσκαφών και συγκεκριμένα ο εντοπισμός ηλεκτρομαγνητικών εκπομπών με την κατάλληλη επιλογή και διάταξη κεραιών σε αερόχημα, οι μέθοδοι εύρεσης της τοποθεσίας των πομπών καθώς και η ανάλυση των τρόπων επικοινωνίας και μεταφοράς δεδομένων ενός Σμήνους Μη Επανδρωμένων Αεροσκαφών.
description: The development of Unmanned Aerial Vehicles and their impact at both civil and military level have brought great scientific interest. In the military, both modern forms of warfare (Net-centric Battlefield) and the desire to reduce the cost of human lives have led to the development of unmanned and intelligent systems to achieve these goals. The purpose of this work is the study of Electronic Warfare applications through Unmanned Aerial Vehicles or UAV Swarms and in particular the detection of electromagnetic emissions with the appropriate selection and arrangement of airborne antennas, methods of locating transmitters and the analysis of communication methods and data transfer in a UAV Swarm.
Rebound and toughening mechanisms in steel fiber reinforced dry-mix shotcrete
Creators: name: Armelin, Hugo Sogayar
Publisher: name: University of British Columbia
Year: 2009

description: Despite its worldwide application, dry-mix shotcrete is characterized by a 30 to 40% material loss due to rebound. For cases in which steel fibers are used, fiber rebound tends to be even greater at approximately 75%. This represents one of the main drawbacks to this technique and is one of the primary challenges facing the shotcrete industry today. Therefore, this work aimed at examining the fundamental mechanisms of aggregate and fiber rebound in dry-mix shotcrete and the parameters influencing them. In order to deal with aggregate rebound, a high speed camera was used to observe the shooting and rebound processes and an extensive shotcrete experimental program was carried out to investigate the various parameters of mix design and shooting technique that cause rebound. Additionally, using a theory of plasticity approach, a general model of aggregate rebound for shotcrete was developed and shown to be in good agreement with experiments. Shotcrete tests show that proper adjustment of the mix-design and shooting technique can lead to minimized aggregate rebound. The problem of fiber rebound was investigated using an experimental approach in which various mix designs and fiber geometries were produced and tested in actual dry-mix shotcrete conditions. It was found that steel fiber rebound is linearly related to a fiber aspect ratio given by the fiber length divided by the square root of its diameter. Special emphasis was given to the development of a steel fiber for dry-mix shotcrete with reduced rebound and optimized toughness performance. In order for this to be possible, a new concept in fiber anchorage was introduced and a computer model, capable of relating the pull-out of single fibers to the post-cracking flexural strength of shotcrete was developed and used to optimize this new fiber geometry for shotcrete conditions. Prototype tests using this new fiber in dry-mix shotcrete show significantly enhanced toughness performance when compared to the most efficient existing commercial fibers.
Superconformal geometries and local twistors
Creators: name: Howe, P. S.
name: Lindström, U.
Publisher: name: arXiv
Year: 2020
Subjects: subject: High Energy Physics - Theory (hep-th)
subject: Differential Geometry (math.DG)
subject: FOS: Physical sciences
subject: FOS: Mathematics

description: Superconformal geometries in spacetime dimensions $D=3,4,{5}$ and $6$ are discussed in terms of local supertwistor bundles over standard superspace. These natually admit superconformal connections as matrix-valued one-forms. In order to make contact with the standard superspace formalism it is shown that one can always choose gauges in which the scale parts of the connection and curvature vanish, in which case the conformal and $S$-supersymmetry transformations become subsumed into super-Weyl transformations. The number of component fields can be reduced to those of the minimal off-shell conformal supergravity multiplets by imposing constraints which in most cases simply consists of taking the even covariant torsion two-form to vanish. This must be supplemented by further dimension-one constraints for the maximal cases in $D=3,4$. The subject is also discussed from a minimal point of view in which only the dimension-zero torsion is introduced. Finally, we introduce a new class of supermanifolds, local super Grassmannians, which provide an alternative setting for superconformal theories.
description: 33 pages, Dedicated to this year's Nobel Laureate in Physics, Sir Roger Penrose, in appreciation of his many achievements, including the invention of twistor theory. References and minor comments added.arXiv admin note: text overlap with arXiv:2008.10302
A test of the power law relationship between gamma-ray burst pulse width ratio and energy expected in fireballs or uniform jets
Creators: name: Peng, Z. -Y.
name: Qin, Y. -P.
name: Zhang, B. -B.
name: Lu, R. -J.
name: Jia, L. -W.
name: Zhang, Z. -B.
Publisher: name: arXiv
Year: 2006
Subjects: subject: Astrophysics (astro-ph)
subject: FOS: Physical sciences

description: Recently, under the assumption that the Doppler effect of the relativistically expanding fireball surface is important, Qin et al. showed that in most cases the power law relationship between the pulse width and energy of gamma-ray bursts (GRBs)would exist in a certain energy range. We check this prediction with two GRB samples which contain well identified pulses. A power law anti-correlation between the full pulse width and energy and a power law correlation between the pulse width ratio and energy are seen in the light curves of the majority (around 65%) of bursts of the two samples within the energy range of BATSE, suggesting that these bursts are likely to arise from the emission associated with the shocks occurred on a relativistically expanding fireball surface. For the rest of the bursts, the relationships between these quantities were not predicted previously. We propose to consider other spectral evolutionary patterns or other radiation mechanisms such as a varying synchrotron or Comptonized spectrum to check if the observed relationships for these rest bursts can also be accounted for by the Doppler model. In addition, we find that the upper limits of the width ratio for the two samples do not exceed 0.9, in agrement with what predicted previously by the Doppler model. The plateau/power law/plateau and the peaked features predicted and detected previously by Qin et al. are generally observed, with the exceptions being noticed only in a few cases. According to the distinct values of two power law indices of FWHM and ratio and energy, we divide the bursts into three subsets which are located in different areas of the two indices plane. We suspect that different locations of the two indices might correspond to different mechanisms.
description: 16 pages, 7 figures, MNRAS accepted
Anscombe's 1948 variance stabilizing transformation for the negative binomial distribution is well suited to RNA-Seq expression data
Creators: name: Harrison, Paul
Publisher: name: F1000Research
Year: 2015

description: The negative binomial distribution has been proposed as a good fit to RNA-seq read count data, taking into account noise due to both the count-based nature of the data and biological variation. It is possible to use this distribution directly for GLM-based differential expression (as in EdgeR or DESeq2), but for many other statistical techniques and visualizations a simpler error model with a constant level of variance is assumed. When working with RNA-Seq data it is also useful to be able to speak in terms of fold-changes, so a log transformation is often used, however this overly inflates variation for genes with small counts. What is needed is a moderated log transformation, behaving like log for large counts but more moderately for small counts. One commonly used moderated log transformation is log(x+c) where c is thought of as a "prior count". Anscombe in 1948 gave another moderated log transformation which provides uniform variance over a wider range of expression levels. He also gives a reasonable choice of value for the prior count c in the log(x+c) form based on the dispersion (which may be estimated using software such as EdgeR).
Deducing Local Rules for Solving Global Tasks with Random Boolean Networks
Creators: name: Mesot, Bertrand
name: Teuscher, Christof
Publisher: name: arXiv
Year: 2006
Subjects: subject: Disordered Systems and Neural Networks (cond-mat.dis-nn)
subject: FOS: Physical sciences

description: It has been shown that uniform as well as non-uniform cellular automata (CA) can be evolved to perform certain computational tasks. Random Boolean networks are a generalization of two-state cellular automata, where the interconnection topology and the cell's rules are specified at random. Here we present a novel analytical approach to find the local rules of random Boolean networks (RBNs) to solve the global density classification and the synchronization task from any initial configuration. We quantitatively and qualitatively compare our results with previously published work on cellular automata and show that randomly interconnected automata are computationally more efficient in solving these two global tasks. Our approach also provides convergence and quality estimates and allows the networks to be randomly rewired during operation, without affecting the global performance. Finally, we show that RBNs outperform small-world topologies on the density classification task and that they perform equally well on the synchronization task. Our novel approach and the results may have applications in designing robust complex networks and locally interacting distributed computing systems for solving global tasks.
description: 35 pages, http://authors.elsevier.com/sd/article/S0167278905003507
Geometric phases of a vortex in a superfluid
Creators: name: Polkinghorne, Rodney E. S.
name: Groszek, Andrew J.
name: Simula, Tapio P.
Publisher: name: arXiv
Year: 2021
Subjects: subject: Quantum Gases (cond-mat.quant-gas)
subject: FOS: Physical sciences

description: We consider geometric phases of mobile quantum vortices in superfluid Bose-Einstein condensates. Haldane and Wu [Phys. Rev. Lett. 55, 2887 (1985)] showed that the geometric phase, $γ_{\mathcal C}=2πN_{\mathcal C}$, of such a vortex is determined by the number of condensate atoms $N_{\mathcal C}$ enclosed by the vortex trajectory. Considering an experimentally realistic freely orbiting vortex leads to an apparent disagreement with this prediction. We resolve it using the superfluid electrodynamics picture, which allows us to identify two additional contributions to the measured geometric phase; (i) a topologically protected edge current of vortices at the condensate boundary, and (ii) a superfluid displacement current. Our results generalise to, and pave the way for experimental measurements of vortex geometric phases using scalar and spinor Bose--Einstein condensates, and superfluid Fermi gases.
description: 8 pages, 7 figures, 5 videos. Submitted to Physical Review Letters
Irreducible components in an algebraic variety of representations of a family of one-relator groups
Creators: name: Liriano, S.
Publisher: name: arXiv
Year: 2006
Subjects: subject: Group Theory (math.GR)
subject: FOS: Mathematics
subject: 20F38, 14Q99

description: Given a finitely generated group G, the set Hom(G,SL_2 C) inherits the structure of an algebraic variety R(G)called the "representation variety" of G. This algebraic variety is an invariant of G. Let G_{pt}=< a, b; a^p= b^t>, where p, t are integers greater than one. In this paper a formula is produced yielding the number of four dimensional irreducible components of the affine algebraic variety R(G_{pt}). A direct consequence of the main theorem of this paper is that if K is a torus knot, then its genus equals the number of four dimensional components of R(G_{pt}) corresponding to its knot group G_{pt}.
description: 5 pages
Rulers of the Sea - Maritime Strategy and Sea Power in Ancient Greece 550-321 BC
Creators: name: Nash, John
Publisher: name: The Australian National University
Year: 2019

description: The ancient Greeks have always been credited with having a strong maritime and naval heritage, yet little scholarship is devoted to exploring ancient Greek sea power. Works that do exist either focus on naval and technical matters or are focused solely on Athenian sea power. Often sea power is ignored or denigrated in the works of modern scholars. Yet sea power theory has a long and rich history, and the Greeks themselves thought deeply on maritime matters. Using sea power theory as a conceptual framework and examining the actual operations of the ancient Greeks, it can be seen that sea power was of great importance during the period examined. This thesis examines sea power during the period 550-321 BC. The first half sets the practical parameters by which maritime forces could operate, followed by an exploration of the 'maritime consciousness' of the Greeks. The second part of the thesis examines maritime operations during peace and war. Influenced by contemporary thinking on sea power and strategy, the thesis broadly categorizes these operations into military, diplomatic and constabulary operations and examines how sea power influenced and even decided events ashore and had a strong impact on the course of fifth and fourth century Greek history.
Searching of specificity and selectivity by radiofrequency thermorhizotomy in trigeminal neuralgia
Creators: name: Visconti, Ciro
Publisher: name: F1000Research
Year: 2015

description: Trigeminal neuralgia is a chronic neuropathic pain disorder of the fifth cranial nerve characterized by sporadic episodes of extreme, sudden, burning or shock-like unilateral facial pain lasting for a few seconds to minutes and to hours. Percutaneous techniques for trigeminal neuralgia are all destructive including the radiofrequency thermorhizotomy (RT) that produces more or less selective lesions by monitoring the tip of electrode for temperature and time for lesion and by identifying the exact position of needle point for specific division asking to awakened patient during sensory stimulation. Therefore there is a search to limit lesions to small nociceptive fibers avoiding facial hypoesthesia and motor deficit working on exact branch of painful syndrome. We are evaluating side and long-term effects in a small series of consecutive patients treated with a “mild” thermolesion.
Intradiscal plus dorsal radicular ganglia's pulsed radiofrequency and intraforaminal steroid injection for lumbar radiculopathies
Creators: name: Visconti, Ciro
Publisher: name: F1000Research
Year: 2015

description: Intradiscal Pulsed RadioFrequency (I-PRF), Dorsal Radicular Ganglia PRF (DRG-PRF) or Intraforaminal Steroid Injection (ISI) each alone are minimally invasive therapeutic choices for chronic low back and leg pain. No evaluations exist for the integrated treatments to cure lumbar radiculopathies. PRF is a less destructive treatment based on high-voltage currents than conventional radiofrequency and it can be applied to intervertebral disc and dorsal root ganglia. Our purpose is to value a clinical usefulness of combining together I-PRF, DRG-PRF and ISI and their long time effects in a consecutive series of lumbar radiculopathies.
Detection mechanism for ferroelectric domain boundaries with lateral force microscopy
Creators: name: Jungk, T.
name: Hoffmann, A.
name: Soergel, E.
Publisher: name: arXiv
Year: 2006
Subjects: subject: Materials Science (cond-mat.mtrl-sci)
subject: FOS: Physical sciences

description: The contrast mechanism for the visualization of ferroelectric domain boundaries with lateral force microscopy is generally assumed to be caused by mechanical deformation of the sample due to the converse piezoelectric effect. We show, however, that electrostatic interactions between the charged tip and the electric fields arising from the surface polarization charges dominate the contrast mechanism. This explanation is sustained by quantitative analysis of the measured forces as well as by comparative measurements on different materials.
Combined tapentadol and radiofrequency thermorizhotomy in management of postherpetic neuralgia
Creators: name: Visconti, Ciro
Publisher: name: F1000Research
Year: 2015

description: Postherpetic neuralgia (PHN) is a complex neuropathic pain condition with pathologic damage to nerve tissue from skin to spinal cord and defined as dermatomal spontaneous and continuous burning pain, paroxysmal shooting or electric shock–like pains with mechanical allodynia and hyperalgesia persisting at least 90 days after the appearance of the acute herpes zoster rash. Radiofrequency is a high-frequency current treatment for neuropathic pain that induces distance-dependent tissue destruction under the stimulating needle, more pronounced with higher temperatures and time. A combined treatment by peripheral radiofrequency thermorizotomy at lower temperature (less of 60°C) and incremental doses of tapentadol, a drug stimulating inhibitory μ-opioid receptors and mediating noradrenaline reuptake inhibition, can modify the course of a difficult painful syndrome like PHN.
Knots with identical Khovanov homology
Creators: name: Watson, Liam
Publisher: name: arXiv
Year: 2006
Subjects: subject: Geometric Topology (math.GT)
subject: FOS: Mathematics

description: We give a recipe for constructing families of distinct knots that have identical Khovanov homology and give examples of pairs of prime knots, as well as infinite families, with this property.
description: v2: major revision. v3: typos corrected, minor clarifications. 12 pages, many figures
Clinical outcome of intradiscal pulsed radiofrequency correlated to paraesthesias mapping of painful intervertebral disc
Creators: name: Visconti, Ciro
Publisher: name: F1000Research
Year: 2015

description: Intradiscal Pulsed Radiofrequency (I-PRF) is a promising mini invasive procedure without raising temperature over 42°C for chronic disabling discogenic axial low back pain. It uses a monopolar pulsed electric field from the center of the nucleus pulposus to relieve pain of degenerative disc disease by a biological and/or immunological effect temperature- indipendent. We have compared the clinical outcome of axial low back pain and paraesthesias mapping obtained with sensitive stimulation of I-PRF treatment.
Burning mouth syndrome and failed radiofrequency treatment
Creators: name: Visconti, Ciro
Publisher: name: F1000Research
Year: 2015

description: The Burning Mouth Syndrome (BMS) (synonyms are scalded mouth syndrome, burning tongue syndrome, burning lips syndrome, stomatodynia and glossodynia) is an idiopathic uncommon benign oral painful syndrome with several different patterns and with unknown causes. Patients complain for ongoing or recurrent of mouth and tongue burning pain, oral dysesthesia but normal is physical examination, therefore diagnosis is of exclusion. Women are seven times affected than men, increasing prevalence with advancing age, especially after 55 yrs. Drugs for BMS include clonazepam, amitriptyline, nortriptyline, doxepin, gabapentin and pregabalin, others such as alpha lipoic acid may be useful as well as topical capsaicin. A non-pharmacologic approach to management can be useful like laser therapy, stress management reduction, meditation, yoga, exercise, psychotherapy and cognitive behavioral therapy. Somatic (lingual nerve block) and sympathetic (stellate ganglion blockade) nerve blocks are a therapeutic choice for facial pain. We have combined sphenopalatine, maxillary and mandibular pulsed radiofrequency (PRF) treatments in two women with BMS resistant treatments.
Fermions in the Presence of the Antisymmetric Fields
Creators: name: Kamani, Davoud
Publisher: name: arXiv
Year: 2006
Subjects: subject: High Energy Physics - Theory (hep-th)
subject: FOS: Physical sciences

description: In this manuscript we study the Dirac action in the presence of the Ramond-Ramond (R-R) potentials as gauge fields. Therefore, for the R-R field $A_{μ_1...μ_{p+1}}$, we identify the corresponding fermion with an extended $p$-dimensional object, which we call it F$p$-brane. Conservation of the tensor currents, associated to these fermionic branes, imposes an external tensor current. This external current enables us to study the R-R fields and their Hodge dual fields as independent degrees of freedom. We observe that an F$p$-brane should live with its dual brane, $i.e.$ F$(d-p-2)$-brane. The gauge symmetry and some other properties of a system of an F$p$-brane and its dual object will be discussed.
description: 8 pages, Latex, no figure;Int. Rev. Phys.-June 2008.
Using Markov Logic Networks to Provide Autonomic Management of High Performance Computing System Configurations and Operations
Creators: name: Schauer, Randy Nicholas
Publisher: name: Maryland Shared Open Access Repository
Year: 2014
Subjects: autonomic computing
configuration management
high performance computing
job scheduling
markov logic networks

description: A framework utilizing statistical relational learning methods to resolve configuration conflicts and maintain details of system state can remain functionally cohesive, domain flexible, and minimize initial configuration and state awareness in order to provide automated services for managing the complex and changing configuration and operations of High Performance Computing systems. In this dissertation, the issue of how to construct and utilize a framework built upon distributed knowledge to manage complex system configuration and operations is addressed. The focal point of the framework is the statistical relational learning model using Markov Logic Networks (MLNs), which can be applied in different ways to various types of system management problems. This framework provides a new methodology to solving these issues without relying on a centralized knowledge base. Beyond the use of MLNs, this framework contains modules covering host selection, data gathering, inference analysis, and analysis actions.  To understand how the framework can be applied to various system management domains, two different areas have been selected to prove its flexibility and functionality: configuration management and job scheduling. The configuration management domain focuses on a variety of operating system-level parameters to ensure consistency and correctness. While the job scheduling domain focuses on understanding processor core temperatures and profiles across the system to minimize the thermal variance across the system using intelligent scheduling techniques.  The contributions of this dissertation are: (i) Development of a framework to provide consistent system management functionality in a distributed manner using MLNs; (ii) Defining an approach to implementing this framework to solve distributed configuration management issues and analyzing these results to correct identified conflicts; and (iii) Defining a job scheduling approach for HPC systems which has a set goal of thermal balancing while utilizing this framework and analyzing its results to minimize thermal variance across a system.
Using Machine Learning Techniques to Identify Source Code Documents
Creators: name: Maselko, Daniel Stephen
Publisher: name: Maryland Shared Open Access Repository
Year: 2014
Subjects: classification
clustering
machine learning
source code

description: This thesis examines the application of document classification techniques to collections of source code for the purpose of semantic annotation. Typical approaches to this problem in previous research have involved static analysis, which requires an understanding of some program semantics already, dynamic analysis, which requires program execution, or learning from metadata associated with a program. The methodology of this work is unique in that it utilizes machine learning methods to identify the behavior of algorithms based solely on syntactic features of the source code. Applications include indexing source code repositories to expedite searching therein, and recognizing inconspicuous programming faults that can lead to software producing undesired results. The methodology begins with the extraction of features from source code. The performance of both decision trees and support vector machines is analyzed. In addition, a complementary approach is evaluated that uses unsupervised clustering to find natural groupings and concept descriptions in a set of source code fragments. We provide an analysis of the effects of varying n-gram degrees, feature expressiveness and feature selection on the accuracy of the classifiers, and the structure and concepts generated by the clustering approach. Even with minimally expressive features, both the support vector machine and decision tree models are able to categorize source code samples based on the algorithm they implement with high accuracy. Most classification errors tend to occur between semantically similar algorithms, but disparate algorithms are often distinguishable.
Ambiguity of Objective Image Quality Metrics: A New Methodology for Performance Evaluation
Creators: name: Cheon, Manri
name: Vigier, Toinon
name: Krasula, Lukáš
name: Lee, Junghyuk
name: Callet, Patrick Le
name: Lee, Jong-Seok
Publisher: name: arXiv
Year: 2021
Subjects: subject: Multimedia (cs.MM)
subject: Image and Video Processing (eess.IV)
subject: FOS: Computer and information sciences
subject: FOS: Electrical engineering, electronic engineering, information engineering

description: Objective image quality metrics try to estimate the perceptual quality of the given image by considering the characteristics of the human visual system. However, it is possible that the metrics produce different quality scores even for two images that are perceptually indistinguishable by human viewers, which have not been considered in the existing studies related to objective quality assessment. In this paper, we address the issue of ambiguity of objective image quality assessment. We propose an approach to obtain an ambiguity interval of an objective metric, within which the quality score difference is not perceptually significant. In particular, we use the visual difference predictor, which can consider viewing conditions that are important for visual quality perception. In order to demonstrate the usefulness of the proposed approach, we conduct experiments with 33 state-of-the-art image quality metrics in the viewpoint of their accuracy and ambiguity for three image quality databases. The results show that the ambiguity intervals can be applied as an additional figure of merit when conventional performance measurement does not determine superiority between the metrics. The effect of the viewing distance on the ambiguity interval is also shown.
Twisting Derived Equivalences
Creators: name: Ben-Bassat, Oren
Publisher: name: arXiv
Year: 2006
Subjects: subject: Algebraic Geometry (math.AG)
subject: High Energy Physics - Theory (hep-th)
subject: Representation Theory (math.RT)
subject: FOS: Mathematics
subject: FOS: Physical sciences
subject: 14J99;14H10; 14H15; 14H60; 14H81; 14H70; 32C99

description: We introduce a new method for ``twisting'' relative equivalences of derived categories of sheaves on two spaces over the same base. The first aspect of this is that the derived categories of sheaves on the spaces are twisted. They become derived categories of sheaves on gerbes living over spaces that are locally (on the base) isomorphic to the original spaces. Secondly, this is done in a compatible way so that the equivalence is maintained. We apply this method by proving the conjectures of Donagi and Pantev on dualities between gerbes on genus-one fibrations and comment on other applications to families of higher genus curves. We also include a related conjecture in Mirror Symmetry. This represents a modified version of my May 2006 thesis for the University of Pennsylvania. The only addition is the subsection titled 'Alternative Method'.
description: All Comments Welcome
Dissipative dynamics of a particle coupled to field via internal degrees of freedom
Creators: name: Sinha, Kanupriya
name: López, Adrián Ezequiel Rubio
name: Subaşı, Yiğit
Publisher: name: arXiv
Year: 2021
Subjects: subject: Quantum Physics (quant-ph)
subject: FOS: Physical sciences

description: We study the non-equilibrium dissipative dynamics of the center of mass of a particle coupled to a field via its internal degrees of freedom. We model the internal and external degrees of freedom of the particle as quantum harmonic oscillators in 1+1 D, with the internal oscillator coupled to a scalar quantum field at the center of mass position. Such a coupling results in a nonlinear interaction between the three pertinent degrees of freedom -- the center of mass, internal degree of freedom, and the field. It is typically assumed that the internal dynamics is decoupled from that of the center of mass owing to their disparate characteristic time scales. Here we use an influence functional approach that allows one to account for the self-consistent backaction of the different degrees of freedom on each other, including the coupled non-equilibrium dynamics of the internal degree of freedom and the field, and their influence on the dissipation and noise of the center of mass. Considering a weak nonlinear interaction term, we employ a perturbative generating functional approach to derive a second order effective action and a corresponding quantum Langevin equation describing the non-equilibrium dynamics of the center of mass. We analyze the resulting dissipation and noise arising from the field and the internal degree of freedom as a composite environment. Furthermore, we establish a generalized fluctuation-dissipation relation for the late-time dissipation and noise kernels. Our results are pertinent to open quantum systems that possess intermediary degrees of freedom between system and environment, such as in the case of optomechanical interactions.
description: LA-UR-21-20103
Optimal control of entanglement via quantum feedback
Creators: name: Mancini, Stefano
name: Wiseman, Howard M.
Publisher: name: arXiv
Year: 2006
Subjects: subject: Quantum Physics (quant-ph)
subject: FOS: Physical sciences

description: It has recently been shown that finding the optimal measurement on the environment for stationary Linear Quadratic Gaussian control problems is a semi-definite program. We apply this technique to the control of the EPR-correlations between two bosonic modes interacting via a parametric Hamiltonian at steady state. The optimal measurement turns out to be nonlocal homodyne measurement -- the outputs of the two modes must be combined before measurement. We also find the optimal local measurement and control technique. This gives the same degree of entanglement but a higher degree of purity than the local technique previously considered [S. Mancini, Phys. Rev. A {\bf 73}, 010304(R) (2006)].
description: 10 pages, 5 figures
Relativistic description of heavy tetraquarks
Creators: name: Ebert, D.
name: Faustov, R. N.
name: Galkin, V. O.
Publisher: name: arXiv
Year: 2008
Subjects: subject: High Energy Physics - Phenomenology (hep-ph)
subject: FOS: Physical sciences

description: The masses of the ground state and excited heavy tetraquarks with hidden charm and bottom are calculated within the relativistic diquark-antidiquark picture. The dynamics of the light quark in a heavy-light diquark is treated completely relativistically. The diquark structure is taken into account by calculating the diquark-gluon form factor. New experimental data on charmonium-like states above the open charm threshold are discussed. The obtained results indicate that X(3872), Y(4260), Y(4360), Z(4433) and Y(4660) can be tetraquark states with hidden charm.
description: 6 pages, talk at the scientific session-conference of Nuclear Physics Department RAS ``Physics of fundamental interactions'', 25-30 November 2007, ITEP, Moscow
Letter from G.A. Hankey & Co., Ltd. at the Liverpool, London & Globe Insurance Company to "Sir" [Frank Hewer], January 22, 1909
Creators: name: Liverpool, London
Publisher: name: The University of British Columbia
Year: 2017

description: Letter to "Sir" [Frank Hewer] from G.A. Hankey & Co., Ltd. at the Liverpool, London & Globe Insurance Company, dated January 22, 1909, regarding finances, documents, and loans.
Deuterated molecules in DM Tau: DCO+, but no HDO
Creators: name: Guilloteau, Stéphane
name: Piétu, Vincent
name: Dutrey, Anne
name: Guélin, Michel
Publisher: name: arXiv
Year: 2006
Subjects: subject: Astrophysics (astro-ph)
subject: FOS: Physical sciences

description: We report the detection of the J=2-1 line of DCO+ in the proto-planetary disk of DM Tau and re-analyze the spectrum covering the 465 GHz transition of HDO in this source, recently published by Ceccarelli et al. (2005). A modelling of the DCO+ line profile with the source parameters derived from high resolution HCO+ observations yields a DCO+/HCO+ abundance ratio of about 0.004, an order of magnitude smaller than that derived in the low mass cores. The re-analysis of the 465 GHz spectrum, using the proper continuum flux (0.5 Jy) and source systemic velocity (6.05 km/s), makes it clear that the absorption features attributed to HDO and C6H are almost certainly unrelated to these species. We show that the line-to-continuum ratio of an absorption line in front of a Keplerian disk can hardly exceed the ratio of the turbulent velocity to the projected rotation velocity at the disk edge, unless the line is optically very thick (tau > 10 000). This ratio is typically 0.1-0.3 in proto-planetary disks and is about 0.15 in DM Tau, much smaller than that for the alleged absorption features. We also show that the detection of H2D+ in DM Tau, previously reported by these authors, is only a 2-sigma detection when the proper velocity is adopted. So far, DCO+ is thus the only deuterated molecule clearly detected in proto-planetary disks.
Characterization of regulated protein secretion in phytophthora zoospores
Creators: name: Zhang, Weiwei
Publisher: name: The Australian National University
Year: 2018

description: Secretion of pathogen proteins is crucial for establishment of disease in animals and plants. Typically, early interactions between host and pathogen trigger regulated secretion of pathogenicity factors that function in pathogen adhesion and host penetration. During the onset of plant infection by spores of the Oomycete, Phytophthora nicotianae, proteins are secreted from three types of cortical vesicles. Following induction of spore encystment, two vesicle types undergo full fusion, releasing their entire contents onto the cell surface. However, the third vesicle type, so-called large peripheral vesicles, selectively secretes a small Sushi domain-containing protein, PnCcp, while retaining a large glycoprotein, PnLpv, before moving away from the plasma membrane. The experiments described in this thesis aim to characterize the differential secretion and retention of proteins from the large peripheral vesicles in Phytophthora spores and to investigate the possible mechanisms underlying the selective secretion of large peripheral vesicle proteins. Green fluorescent protein (GFP)-tagged PnCcp proteins were expressed in P. nicotianae by genetic transformation in order to study the subcellular localization and secretion of PnCcp in living cells. Analysis of drug-resistant transformants indicated that sometimes the PnCcp-GFP transgene was not expressed and at other times the fusion protein was not fluorescent or was mislocalized to the cytoplasm or the extracellular space other than the large peripheral vesicles. Double-immunofluorescence labelling of P. nicotianae spores both in vitro and in planta confirmed that PnCcp was secreted from the large peripheral vesicles while PnLpv was retained during encystment. Immunolocalization studies of P. nicotianae mycelia revealed that the synthesis of PnLpv precedes that of PnCcp and PnCcp is added to large peripheral vesicles after PnLpv. By immunofluorescence labelling and enzyme-linked immunosorbent assays (ELISAs), the majority of the PnCcp protein was detected to be secreted within 1-2 min of the onset of encystment and secretion of PnCcp occurred at a similar time period as that of ventral and dorsal vesicle proteins. Selective secretion of PnCcp is associated with its compartmentalization within the vesicle periphery. Pharmacological inhibition of dynamin function, purportedly in vesicle fission, by dynasore treatment provides evidence that selective secretion of PnCcp utilizes a kiss-and-run, transient fusion mechanism similar to that described in animal cells. This is the first report of transient fusion and selective protein secretion outside mammalian cells. Results also show that full or transient fusion of different populations of vesicles is triggered simultaneously by the same signal. The research in this thesis expanded our understanding of regulated protein secretion in Phytophthora and other systems.
Deterministic attitude and pose filtering, an embedded Lie groups approach
Creators: name: Zamani, Mohammad
Publisher: name: The Australian National University
Year: 2018
Subjects: subject: Robots Motion
subject: Robots Control systems
subject: Lie groups

description: Attitude estimation is a core problem in many robotic systems that perform automated or semi automated navigation. The configuration space of the attitude motion is naturally modelled on the Lie group of special orthogonal matrices SO(3). Many current attitude estimation methods are based on non-matrix parameterization of attitude. Non-matrix parameterization schemes sometimes lead to modelling issues such as the singularities in the parameterization space, non-uniqueness of the attitude estimates and the undesired conversion errors such as the projection or normalization errors. Moreover, often attitude filters are designed by linearizing or approximating the nonlinear attitude kinematics followed by applying the Kalman filtering based methods that are primarily only suitable for linear Gaussian systems. In this thesis, the attitude estimation problem is considered directly on SO(3) along with nonlinear vectorial measurement models. Minimum-energy filtering is adapted to respect the geometry of the problem and in order to solve the problem avoiding linearization or Gaussian assumptions. This approach allows for obtaining a geometric approximate minimum-energy (GAME) filter whose performance is tested by means of Monte Carlo simulations. Many of the major attitude filtering methods in the literature are surveyed and included in the simulation study. The GAME filter outperforms all of the state of the art attitude filters studied, including the multiplicative extended Kalman filter (MEKF), the unscented quaternion estimator (USQUE), the right-invariant extended Kalman filter (RIEKF) and the nonlinear constant gain attitude observer, in the asymptotic estimation error. Furthermore, the proposed GAME filter is shown to be near-optimal by deriving a bound on the optimality error of the filter that is proven to be small in simulations. Moreover, similar GAME filters are derived for pose filtering on the special Euclidean group SE(3), attitude and bias filtering on the unit circle and attitude and bias filtering on the special orthogonal group. The approximation order of the proposed method can potentially be extended to arbitrary higher orders. For instance, for the case angle estimation on the unit circle an eighth-order approximate minimum-energy filter is provided.
Two-pion transitions in quarkonium revisited
Creators: name: Voloshin, M. B.
Publisher: name: arXiv
Year: 2006
Subjects: subject: High Energy Physics - Phenomenology (hep-ph)
subject: FOS: Physical sciences

description: Two-pion transitions in charmonium and bottomonium are considered with the leading relativistic effects taken into account. The contribution of the chromo- magnetic interaction of the charmed quarks to the amplitude of the decay $ψ(2S) \to ππJ/ψ$ is estimated from the available data. This contribution is enhanced by a factor of three in the decay $η_c(2S) \to ππη_c$ and should produce a noticeable modification of the rate and the spectrum in the latter decay. It is argued that the peculiar observed spectrum in the decay $Υ(3S) \to ππΥ$ arises due to a dynamical suppression of the leading nonrelativistic quarkonium amplitude and thus enhanced prominence of the relativistic terms. Also discussed are the effects of the final state interaction between the pions.
description: 23 pages, 2 figures
2019 Blue-Action Flyer
Creators: name: Grist, Hannah
Publisher: name: Zenodo
Year: 2019
Subjects: climate
H2020
research

description: This flyer is an introduction to the H2020 climate science project Blue-Action. It covers our aims, work packages and details of who to contact for further information.If you are interested in having a printed copy, please contact hannah.grist@srsl.com
Anomalous Hall Effect in Graphite
Creators: name: Kopelevich, Y.
name: Pantoja, J. C. Medina
name: da Silva, R. R.
name: Mrowka, F.
name: Esquinazi, P.
Publisher: name: arXiv
Year: 2006
Subjects: subject: Strongly Correlated Electrons (cond-mat.str-el)
subject: Materials Science (cond-mat.mtrl-sci)
subject: FOS: Physical sciences

description: We report on the experimental observation of an anomalous Hall effect (AHE) in highly oriented pyrolytic graphite samples. The overall data indicate that the AHE in graphite can be self-consistently understood within the frameworks of the magnetic-field-driven excitonic pairing models.
description: 13 pages including 4 figures