cometadata/datacite-rtg-text-other-reclassification-records huggingface dataset:
Impurity-doping induced ferroelectricity in frustrated antiferromagnet CuFeO2
Creators: name: Seki, S.
name: Yamasaki, Y.
name: Shiomi, Y.
name: Iguchi, S.
name: Onose, Y.
name: Tokura, Y.
Publisher: name: arXiv
Year: 2006
Subjects: subject: Strongly Correlated Electrons (cond-mat.str-el)
subject: FOS: Physical sciences

description: Dielectric responses have been investigated on the triangular-lattice antiferromagnet CuFeO2 and its site-diluted analogs CuFe1-xAlxO2 (x=0.01 and 0.02) with and without application of magnetic field. We have found a ferroelectric behavior at zero magnetic field for x=0.02. At any doping level, the onset field of the ferroelectricity always coincides with that of the noncollinear magnetic structure while the transition field dramatically decreases to zero field with Al doping. The results imply the further possibility of producing the ferroelectricity by modifying the frustrated spin structure in terms of site-doping and external magnetic field.
description: 4 pages, 4 figures
All-passive multiple-place optical phase noise cancellation
Creators: name: Hu, Liang
name: Xue, Ruimin
name: Tian, Xueyang
name: Wu, Guiling
name: Chen, Jianping
Publisher: name: arXiv
Year: 2021
Subjects: subject: Instrumentation and Detectors (physics.ins-det)
subject: Optics (physics.optics)
subject: FOS: Physical sciences

description: We report on the realization of delivering coherent optical frequency to multiple places based on passive phase noise cancellation over a bus topology fiber network. This technique mitigates any active servo controller on the main fiber link and at arbitrary access places as opposed to the conventional technique, in which an active phase compensation circuit has to be adopted to stabilize the main fiber link. Although the residual fiber phase noise power spectral density (PSD) in the proposed technique turns out to be a factor of 7 higher than that of in the conventional multiple-access technique when the access place is close to the end of the fiber link, it could largely suppress the phase noise introduced by the servo bumps, improve the response speed and phase recovery time, and minimize hardware overhead in systems with many stations and connections without the need of the active servo circuits including phase discriminators and active compensators. The proposed technique could considerably simplify future efforts to make precise optical frequency signals available to many users, as required by some large-scale science experiments.
description: 4 pages, 4 figures, Accepted for publication in Optics Letters
Pairing Conceptual Modeling with Machine Learning
Creators: name: Maass, Wolfgang
name: Storey, Veda C.
Publisher: name: arXiv
Year: 2021
Subjects: subject: Software Engineering (cs.SE)
subject: Artificial Intelligence (cs.AI)
subject: Machine Learning (cs.LG)
subject: FOS: Computer and information sciences
subject: H.1

description: Both conceptual modeling and machine learning have long been recognized as important areas of research. With the increasing emphasis on digitizing and processing large amounts of data for business and other applications, it would be helpful to consider how these areas of research can complement each other. To understand how they can be paired, we provide an overview of machine learning foundations and development cycle. We then examine how conceptual modeling can be applied to machine learning and propose a framework for incorporating conceptual modeling into data science projects. The framework is illustrated by applying it to a healthcare application. For the inverse pairing, machine learning can impact conceptual modeling through text and rule mining, as well as knowledge graphs. The pairing of conceptual modeling and machine learning in this this way should help lay the foundations for future research.
Additional file 3 of RNA-Seq analysis in giant pandas reveals the differential expression of multiple genes involved in cataract formation
Creators: name: You, Yuyan
name: Bai, Chao
name: Liu, Xuefeng
name: Lu, Yan
name: Jia, Ting
name: Xia, Maohua
name: Yin, Yanqiang
name: Wang, Wei
name: Chen, Yucun
name: Zhang, Chenglin
name: Liu, Yan
name: Wang, Liqin
name: Pu, Tianchun
name: Ma, Tao
name: Liu, Yanhui
name: Zhou, Jun
name: Niu, Lili
name: Xu, Suhui
name: Ni, Yanxia
name: Hu, Xin
name: Zhang, Zengshuai
Publisher: name: figshare
Year: 2021
Subjects: subject: Genetics
subject: FOS: Biological sciences

description: Additional file 3: Supplementary Table S3. Correlation analysis between samples.
Sideband cooling while preserving coherences in the nuclear spin state in group-II-like atoms
Creators: name: Reichenbach, Iris
name: Deutsch, Ivan H.
Publisher: name: arXiv
Year: 2007
Subjects: subject: Quantum Physics (quant-ph)
subject: FOS: Physical sciences

description: We propose a method for laser cooling group-II-like atoms without changing the quantum state of their nuclear spins, thus preserving coherences that are usually destroyed by optical pumping. As group-II-like atoms have a $^1S_0$ closed-shell ground state, nuclear spin and electronic degrees of freedom are decoupled, allowing for independent manipulation. The hyperfine interaction that couples these degrees of freedom in excited states can be suppressed through the application of external magnetic fields. Our protocol employs resolved-sideband cooling on the forbidden clock transition, $^1S_0 \to {}^3P_0$, with quenching via coupling to the rapidly decaying $^1P_1$ state, deep in the Paschen-Back regime. This makes it possible to laser cool neutral atomic qubits without destroying the quantum information stored in their nuclear spins, as shown in two examples, $^{171}$Yb and $^{87}$Sr.
description: 4 pages, 3 figures v4: minor changes in text, changes in the references, published version
Ανάλυση και μοντελοποίηση στοιχείων ποιότητας αέρα με μεθόδους υπολογιστικής νοημοσύνης για την ευρύτερη περιοχή Θεσσαλονίκης
Creators: name: Κατσιφαράκης, Νικόλαος Κωνσταντίνου
Publisher: name: Aristotle University of Thessaloniki
Year: 2017
Subjects: Ποιότητα αέρα
Υπολογιστική νοημοσύνη-Θεσσαλονίκη
Air quality
Computational Intelligence-Thessaloniki

description: Η μοντελοποίηση της ποιότητας αέρα αποτελεί έναν ιδιαίτερα διαδεδομένο κλάδο επιστημονικής μελέτης, λόγω της επίπτωσης που έχει η υψηλή συγκέντρωση ρύπων στην ανθρώπινη υγεία και όχι μόνο. Ιδιαίτερα για αστικές περιοχές όπως αυτή της Ευρύτερης Περιοχής Θεσσαλονίκης, το πρόβλημα εστιάζεται κυρίως στις πολύ υψηλές συγκεντρώσεις ρύπων όπως τα αιωρούμενα σωματίδια. Για την πλήρη κατανόηση και μοντελοποίηση ενός συστήματος ποιότητας αέρα, υπάρχουν δύο κύριοι άξονες: η αναζήτηση σχέσεων μεταξύ αιτίου-αποτελέσματος (εκπομπών, μετεωρολογικών και άλλων τοπικών συνθηκών και ποιότητας αέρα) και η μοντελοποίηση της συμπεριφοράς αυτού. Η μοντελοποίηση μπορεί να γίνει με χρήση αναλυτικών σχέσεων ή δεδομενοκεντρικά. Στην παρούσα εργασία παρουσιάζονται διάφορες μέθοδοι ανακατασκευής και πρόγνωσης ποιότητας αέρα, καθώς και μέθοδοι εύρεσης συσχετίσεων και επιλογής παραμέτρων. Επιπρόσθετα, παρουσιάζεται μία νέα μέθοδος επιλογής παραμέτρων, που βασίζεται στους Αυτοοργανούμενους Χάρτες. Κατόπιν, παρουσιάζονται τα αποτελέσματα της χρήσης αυτών των μεθόδων και αναλύονται τα συμπεράσματα που προκύπτουν. Τα αποτελέσματα ήταν ενθαρρυντικά σε όλους τους τομείς, τόσο ως προς τις δυνατότητες ανάδειξης συσχετίσεων και μοντελοποίησης-ανακατασκευής των παραμέτρων ενδιαφέροντος, όσο και ως προς την αποτελεσματικότητα και τις προοπτικές της προτεινόμενης μεθόδου επιλογής παραμέτρων
description: Air quality modeling is an important part of scientific research, due to the impact of high concentrations of air pollutants on human health etc. Especially in urban areas as is the wider Thessaloniki area, the main problem is the high concentration of pollutants such as particulate matter. There are two main axes in modeling an air quality system: identifying relationships between cause and effect (emissions, meteorological status etc. and air quality) and modeling this behavior. This can be achieved either using analytical equations, or with data-driven methods. In this study, many forecasting and now – casting methods for air quality parameters are presented, along with relationship identification and feature selection methods. Furthermore, a new feature selection, based on Self-Organizing Maps is presented. Finally, the results of using these methods are presented, and discussed. The results were encouraging in every aspect, regarding both the capabilities of forecasting and now-casting the parameters of interest, as well as the potential of the new, proposed feature selection method
Decision graphs : algorithms and applications to influence diagram evaluation and high-level path planning under uncertainty
Creators: name: Qi, Runping
Publisher: name: University of British Columbia
Year: 2009

description: Decision making under uncertainty has been an active research topic in decision theory, operations research and Artificial Intelligence. The main objective of this thesis is to develop a uniform approach to the computational issues of decision making under uncertainty. Towards this objective, decision graphs have been proposed as an intermediate representation for decision making problems, and a number of search algorithms have been developed for evaluating decision graphs. These algorithms are readily applicable to decision problems given in the form of decision trees and in the form of finite stage Markov decision processes. In order to apply these algorithms to decision problems given in the form of influence diagrams, a stochastic dynamic programming formulation of influence diagram evaluation has been developed and a method to systematically transform a decision making problem from an influence diagram representation to a decision graph representation is presented. Through this transformation, a decision making problem represented as an influence diagram can be solved by applying the decision graph search algorithms. One of the advantages of our method for influence diagram evaluation is its ability to exploit asymmetry in decision problems, which can result in exponential savings in computation. Some problems that can be viewed as decision problems under uncertainty, but are given neither in the form of Markov decision processes, nor in the form of influence diagrams, can also be transformed into decision graphs, though this transformation is likely to be problem-specific. One problem of this kind, namely high level navigation in uncertain environments, has been studied in detail. As a result of this case study, a decision theoretic formulation and a class of off-line path planning algorithms for the problem have been developed. Since the problem of navigation in uncertain environments is of importance in its own right, an on-line path planning algorithm with polynomial time complexity for the problem has also been developed. Initial experiments show that the on-line algorithm can result in satisfactory navigation quality.
Forward Diffracted Parametric X Radiation From a Thick Tungsten Single Crystal at 855 MeV Electron Energy
Creators: name: Backe, H.
name: Lauth, W.
name: Scharafutdinov, A. F.
name: Kunz, P.
name: Gogolev, A. S.
name: Potylitsyn, A. P.
Publisher: name: arXiv
Year: 2006
Subjects: subject: Accelerator Physics (physics.acc-ph)
subject: Instrumentation and Detectors (physics.ins-det)
subject: FOS: Physical sciences

description: Features of forward diffracted Parametric X-Radiation (PXR) were investigated at experiments with the 855 MeV electron beam of the Mainz Microtron MAMI employing a 410 micrometer thick tungsten single crystal. Virtual photons from the electron field are diffracted by the (10-1) plane at a Bragg angle of 3.977 degree. Forward emitted radiation was analyzed at an energy of 40 keV with the (111) lattice planes of a flat silicon single crystal in Bragg geometry. Clear peak structures were observed in an angular scan of the tungsten single crystal. The results were analyzed with a model which describes forward diffracted PXR under real experimental conditions. The experiments show that forward diffracted PXR may be employed to diagnose bending radii of lattice planes in large area single crystals.
Properties of Non-Abelian Fractional Quantum Hall States at Filling $ν=\frac{k}{r}$
Creators: name: Bernevig, B. Andrei
name: Haldane, F. D. M.
Publisher: name: arXiv
Year: 2008
Subjects: subject: Mesoscale and Nanoscale Physics (cond-mat.mes-hall)
subject: Strongly Correlated Electrons (cond-mat.str-el)
subject: FOS: Physical sciences

description: We compute the physical properties of non-Abelian Fractional Quantum Hall (FQH) states described by Jack polynomials at general filling $ν=\frac{k}{r}$. For $r=2$, these states are identical to the $Z_k$ Read-Rezayi parafermions, whereas for $r>2$ they represent new FQH states. The $r=k+1$ states, multiplied by a Vandermonde determinant, are a non-Abelian alternative construction of states at fermionic filling $2/5, 3/7, 4/9...$. We obtain the thermal Hall coefficient, the quantum dimensions, the electron scaling exponent, and show that the non-Abelian quasihole has a well-defined propagator falling off with the distance. The clustering properties of the Jack polynomials, provide a strong indication that the states with $r>2$ can be obtained as correlators of fields of \emph{non-unitary} conformal field theories, but the CFT-FQH connection fails when invoked to compute physical properties such as thermal Hall coefficient or, more importantly, the quasihole propagator. The quasihole wavefuntion, when written as a coherent state representation of Jack polynomials, has an identical structure for \emph{all} non-Abelian states at filling $ν=\frac{k}{r}$.
description: 2 figures
การจัดการความรู้ชุมชน: เกลือหวานภูมิปัญญาท้องถิ่นปัตตานี
Creators: name: วิรินธร อักษรนิตย์, บัณฑิต ดุลยรักษ์, พวงเล็ก วรกุล, ศุภลักษณ์ พลายแสง, ธวัชชัย ศรีเทพ
Publisher: name: สำนักวิทยบริการ มหาวิทยาลัยสงขลานครินทร์ วิทยาเขตปัตตานี
Year: 2019
Subjects: การจัดการความรู้, ภูมิปัญญาท้องถิ่น, การถ่ายทอดความรู้, knowledge management, local wisdom, knowledge transfer

description: วารสารวิทยบริการ มหาวิทยาลัยสงขลานครินทร์, 30, 2, 209-216
Prospects for Mirage Mediation
Creators: name: Pierce, Aaron
name: Thaler, Jesse
Publisher: name: arXiv
Year: 2006
Subjects: subject: High Energy Physics - Phenomenology (hep-ph)
subject: High Energy Physics - Theory (hep-th)
subject: FOS: Physical sciences

description: Mirage mediation reduces the fine-tuning in the minimal supersymmetric standard model by dynamically arranging a cancellation between anomaly-mediated and modulus-mediated supersymmetry breaking. We explore the conditions under which a mirage "messenger scale" is generated near the weak scale and the little hierarchy problem is solved. We do this by explicitly including the dynamics of the SUSY-breaking sector needed to cancel the cosmological constant. The most plausible scenario for generating a low mirage scale does not readily admit an extra-dimensional interpretation. We also review the possibilities for solving the mu/Bmu problem in such theories, a potential hidden source of fine-tuning.
description: 14 pages
Ion-temperature-gradient stability near the magnetic axis of quasisymmetric stellarators
Creators: name: Jorge, R.
name: Landreman, M.
Publisher: name: arXiv
Year: 2021
Subjects: subject: Plasma Physics (physics.plasm-ph)
subject: FOS: Physical sciences

description: The stability of the ion-temperature gradient mode in quasisymmetric stellarators is assessed. This is performed using a set of analytical estimates together with linear gyrokinetic simulations. The peak growth rates, their corresponding real frequencies and wave-vectors are identified. A comparison is made between a first-order near-axis expansion model and eleven realistic designs obtained using numerical optimization methods. It is found that while the near-axis expansion is able to replicate the growth rates, real frequencies and perpendicular wave-vector at the inner core (both using simplified dispersion relations and first-principle gyrokinetic simulations), it leads to an overestimation of the growth rate at larger radii. An approximate analytic solution of the ITG dispersion relation for the non-resonant limit suggests growth rates could be systematically higher in quasi-axisymmetric (QA) configurations compared to quasi-helically (QH) symmetric ones. However except for very close to the axis, linear gyrokinetic simulations do not show systematic differences between QA and QH configurations.
Heavy Ion Physics at RHIC
Creators: name: Tannenbaum, M. J.
Publisher: name: arXiv
Year: 2007
Subjects: subject: Nuclear Experiment (nucl-ex)
subject: FOS: Physical sciences

description: The status of the physics of heavy ion collisions is reviewed based on measurements over the past 6 years from the Relativistic Heavy Ion Collider (RHIC) at Brookhaven National Laboratory. The dense nuclear matter produced in Au+Au collisions with nucleon-nucleon c.m. energy $\sqrt{s_{NN}}=200$ GeV at RHIC corresponds roughly to the density and temperature of the universe a few microseconds after the `big-bang' and has been described as "a perfect liquid" of quarks and gluons, rather than the gas of free quarks and gluons, ``the quark-gluon plasma" as originally envisaged. The measurements and arguments leading to this description will be presented.
description: 31 pages, 23 figures, Proceedings of Symposium "50+ Years of High Energy Physics at UB", University at Buffalo, NY, October 20-21,2006
Gauged 2-form Symmetries in 6D SCFTs Coupled to Gravity
Creators: name: Braun, Andreas P.
name: Larfors, Magdalena
name: Oehlmann, Paul-Konstantin
Publisher: name: arXiv
Year: 2021
Subjects: subject: High Energy Physics - Theory (hep-th)
subject: FOS: Physical sciences

description: We study six dimensional supergravity theories with superconformal sectors (SCFTs). Instances of such theories can be engineered using type IIB strings, or more generally F-Theory, which translates field theoretic constraints to geometry. Specifically, we study the fate of the discrete 2-form global symmetries of the SCFT sectors. For both $(2,0)$ and $(1,0)$ theories we show that whenever the charge lattice of the SCFT sectors is non-primitively embedded into the charge lattice of the supergravity theory, there is a subgroup of these 2-form symmetries that remains unbroken by BPS strings. By the absence of global symmetries in quantum gravity, this subgroup much be gauged. Using the embedding of the charge lattices also allows us to determine how the gauged 2-form symmetry embeds into the 2-form global symmetries of the SCFT sectors, and we present several concrete examples, as well as some general observations. As an alternative derivation, we recover our results for a large class of models from a dual perspective upon reduction to five dimensions.
description: 35 pages plus appendices; v2: typos fixed, references added
A foundation for the design and analysis of robotic systems and behaviors
Creators: name: Zhang, Zhenhai
Publisher: name: University of British Columbia
Year: 2009

description: Robots are generally composed of electromechanical parts with multiple sensors and actuators. The overall behavior of a robot emerges from coordination among its various parts and interaction with its environment. Developing intelligent, reliable, robust and safe robots, or real-time embedded systems, has become a focus of interest in recent years. In this thesis, we establish a foundation for modeling, specifying and verifying discrete/continuous hybrid systems and take an integrated approach to the design and analysis of robotic systems and behaviors. A robotic system in general is a hybrid dynamic system, consisting of continuous, discrete and event-driven components. We develop a semantic model for dynamic systems, that we call Constraint Nets (CN). CN introduces an abstraction and a unitary framework to model discrete/continuous hybrid systems. CN provides aggregation operators to model a complex system hierarchically. CN supports multiple levels of abstraction, based on abstract algebra and topology, to model and analyze a system at different levels of detail. CN, because of its rigorous foundation, can be used to define programming semantics of real-time languages for control systems. While modeling focuses on the underlying structure of a system — the organization and coordination of its components — requirements specification imposes global constraints on a system’s behavior, and behavior verification ensures the correctness of the behavior with respect to its requirements specification. We develop a timed linear temporal logic and timed Ʋ-automata to specify timed as well as sequential behaviors. We develop a formal verification method for timed V-automata specification, by combining a generalized model checking technique for automata with a generalized stability analysis method for dynamic systems. A good design methodology can simplify the verification of a robotic system. We develop a systematic approach to control synthesis from requirements specification, by exploring a relation between constraint satisfaction and dynamic systems using constraint methods. With this approach, control synthesis and behavior verification are coupled through requirements specification. To model, synthesize, simulate, and understand various robotic systems we have studied in this research, we develop a visual programming and simulation environment that we call ALERT: A Laboratory for Embedded Real-Time systems.
Radiation Emission by Extreme Relativistic Electrons and Pair Production by Hard Photons in a Strong Plasma Wakefield
Creators: name: Nerush, E.
name: Kostyukov, I.
Publisher: name: arXiv
Year: 2006
Subjects: subject: Plasma Physics (physics.plasm-ph)
subject: FOS: Physical sciences

description: Radiation spectrum of extreme relativistic electrons and a probability of electron-positron pair production by energetic photons in a strong plasma wakefield are derived in the framework of a semiclassical approach. It is shown that that the radiation losses of the relativistic electron in the plasma wakefield scale as $ \propto ε^{2 / 3}$ in the quantum limit when the energy of the radiated photon becomes close to the electron energy, $ε$. The quantum effects will play a key role in future plasma-based accelerators operating at ultrahigh energy of the electrons.
description: 10 pages, 2 figures
H1 Diffractive Structure Functions Measurement from new data
Creators: name: Sauvan, E.
Publisher: name: arXiv
Year: 2006
Subjects: subject: High Energy Physics - Experiment (hep-ex)
subject: FOS: Physical sciences

description: New measurements of the reduced cross section $σ_r^{D(3)}$ for the diffractive process $ep \to eXY$ in the kinematic domain $12 \leq Q^2 \leq 90$ GeV$^2$, $0.01 \leq β\leq 0.65$ and $\xpom<0.1$ are presented. Data events recorded by the H1 detector during the years 1999--2000 and 2004 have been used, corresponding to a total integrated luminosity of 68 pb$^{-1}$. The measurements are derived in the same range as previous H1 data, namely $M_Y < 1.6$ GeV and $|t| < 1.0$ GeV$^2$. Two different analysis methods, rapidity gap and $M_X$, are used and similar results are obtained in the kinematic domain of overlap. Finally, together with previous data, the diffractive structure function measurements are analysed with a model based on the dipole formulation of diffractive scattering. It is found to give a very good description of the data over the whole kinematic range.
description: 4 pages, 4 figure; To appear in the proceedings of 14th International Workshop on Deep Inelastic Scattering (DIS 2006), Tsukuba, Japan, 20-24 Apr 2006
Tensor-train approximation of the chemical master equation and its application for parameter inference
Creators: name: Ion, Ion Gabriel
name: Wildner, Christian
name: Loukrezis, Dimitrios
name: Koeppl, Heinz
name: De Gersem, Herbert
Publisher: name: arXiv
Year: 2021
Subjects: subject: Computation (stat.CO)
subject: Numerical Analysis (math.NA)
subject: FOS: Computer and information sciences
subject: FOS: Mathematics

description: In this work, we perform Bayesian inference tasks for the chemical master equation in the tensor-train format. The tensor-train approximation has been proven to be very efficient in representing high dimensional data arising from the explicit representation of the chemical master equation solution. An additional advantage of representing the probability mass function in the tensor train format is that parametric dependency can be easily incorporated by introducing a tensor product basis expansion in the parameter space. Time is treated as an additional dimension of the tensor and a linear system is derived to solve the chemical master equation in time. We exemplify the tensor-train method by performing inference tasks such as smoothing and parameter inference using the tensor-train framework. A very high compression ratio is observed for storing the probability mass function of the solution. Since all linear algebra operations are performed in the tensor-train format, a significant reduction of the computational time is observed as well.
A simple explanation of the PVLAS anomaly in spontaneously broken mirror models
Creators: name: Foot, R.
name: Kobakhidze, A.
Publisher: name: arXiv
Year: 2007
Subjects: subject: High Energy Physics - Phenomenology (hep-ph)
subject: FOS: Physical sciences

description: The PVLAS anomaly can be explained if there exist millicharged particles of mass $\stackrel{
description: about 5 pages, expanded discussion, version to be published in PLB
Higher-order behaviour of two-point current correlators
Creators: name: Jamin, Matthias
Publisher: name: arXiv
Year: 2021
Subjects: subject: High Energy Physics - Phenomenology (hep-ph)
subject: FOS: Physical sciences

description: Estimates of higher-order contributions for perturbative series in QCD, in view of their asymptotic nature, are delicate, though indispensable for a reliable error assessment in phenomenological applications. In this work, the Adler function and the scalar correlator are investigated, and models for Borel transforms of their perturbative series are constructed, which respect general constraints from the operator product expansion and the renormalisation group. As a novel ingredient, the QCD coupling is employed in the so-called $C$-scheme, which has certain advantages. For the Adler function, previous results obtained directly in the $\overline{\rm MS}$ scheme are supported. Corresponding results for the scalar correlation function are new. It turns out that the substantially larger perturbative corrections for the scalar correlator in $\overline{\rm MS}$ are dominantly due to this scheme choice, and can be largely reduced through more appropriate renormalisation schemes, which are easy to realise in the $C$-scheme.
description: 24 pages, contribution to EPJ ST "Renormalons and Hyperasymptotics in QCD"; references added
Hot Dirac Fermions in Epitaxial Graphene
Creators: name: Sun, Dong
name: Wu, Zong-Kwei
name: Divin, Charles
name: Li, Xuebin
name: Berger, Claire
name: de Heer, Walt A.
name: First, Phillip N.
name: Norris, Theodore B.
Publisher: name: arXiv
Year: 2008
Subjects: subject: Materials Science (cond-mat.mtrl-sci)
subject: Strongly Correlated Electrons (cond-mat.str-el)
subject: FOS: Physical sciences

description: We investigate the ultrafast relaxation dynamics of hot Dirac fermionic quasiparticles in multilayer epitaxial graphene using ultrafast optical differential transmission spectroscopy. We observe DT spectra which are well described by interband transitions with no electron-hole interaction. Following the initial thermalization and emission of high-energy phonons, the electron cooling is determined by electron-acoustic phonon scattering, found to occur on the time scale of 1 ps for highly doped layers, and 4-11 ps in undoped layers. The spectra also provide strong evidence for the multilayer stucture and doping profile of thermally grown epitaxial graphene on SiC.
description: 16 pages, 4 figures
Management interdisziplinärer Forschungsdaten mit DKAN
Creators: name: Paulet, Lucian
name: Franke, Steffen
name: Becker, Markus M.
Publisher: name: Zenodo
Year: 2019
Subjects: Forschungsdatenmanagement
DKAN
Offene Daten
Plasmatechnologie
INPTDAT
Plasma-MDS

description: Es wird ein Konzept für die Verwaltung interdisziplinärer Forschungsdaten vorgestellt und gezeigt, wie dieses Konzept auf Basis von DKAN, einer etablierten Plattform für offene Daten, implementiert werden kann. Das Konzept sieht vor, dass Forschungsdaten mittels geeigneter Metadatenschemata spezifischen Themenbereichen, Anwendungen und Geräten oder Experimenten zugeordnet und dokumentiert werden. Auf diese Weise können Forschungsdaten in interdisziplinär aufgestellten Communities auch für fachfremde Wissenschaftlerinnen und Wissenschaftler auffindbar und nachnutzbar gemacht werden. Eine praktische Umsetzung des Konzepts wird am Beispiel der Plasmatechnologie als interdisziplinär aufgestellte Querschnittstechnologie diskutiert. Die Ausführungen sollen anderen Fachgemeinschaften als Praxisbeispiel dienen.
Electron Holes in a $κ$ Distribution Background with Singularities
Creators: name: Haas, Fernando
Publisher: name: arXiv
Year: 2021
Subjects: subject: Plasma Physics (physics.plasm-ph)
subject: FOS: Physical sciences

description: The pseudo-potential method is applied to derive diverse propagating electron hole structures, in a nonthermal or $κ$ particle distribution function background. The associated distribution function Ansatz reproduces the Schamel distribution of \cite{Schamel2015} in the Maxwellian ($κ\rightarrow \infty$) limit, providing a significant generalization of it for plasmas where superthermal electrons are ubiquitous, such as space plasmas. The pseudo-potential and the nonlinear dispersion relation are evaluated. The role of the spectral index $κ$ on the nonlinear dispersion relation is investigated, in what concerns the wave amplitude for instance. The energy-like first integral from Poisson's equation is applied to analyze the properties of diverse classes of solutions: with the absence of trapped electrons, with a non-analytic distribution of trapped electrons, or with a surplus of trapped electrons. Special attention is therefore paid to the non-orthodox case where the electrons distribution function exhibits strong singularities, being discontinuous or non-analytic.
A narrow line Seyfert 1--blazar composite nucleus in 2MASX J0324+3410
Creators: name: Zhou, Hongyan
name: Wang, Tinggui
name: Yuan, Weimin
name: Shan, Hongguang
name: Komossa, Stefanie
name: Lu, Honglin
name: Liu, Yi
name: Xu, Dawei
name: Bai, J. M.
name: Jiang, D. R.
Publisher: name: arXiv
Year: 2007
Subjects: subject: Astrophysics (astro-ph)
subject: FOS: Physical sciences

description: We report the identification of 2MASX J032441.19+341045.9 (hereafter 2MASX J0324+3410) with an appealing object which shows the dual properties of both a narrow line Seyfert 1 galaxy (NLS1) and a blazar. Its optical spectrum, which has a Hβline width about 1600 km s^-1 (FWHM), an [OIII] to Hβline ratio ~0.12, and strong FeII emission, clearly fulfills the conventional definition of NLS1s. On the other hand, 2MASX J0324+3410 also exhibits some behavior which is characteristic of blazars, including a flat radio spectrum above 1 GHz, a compact core plus a one-sided jet structure on mas-scale at 8.4 GHz, highly variable fluxes in the radio, optical, and X-ray bands, and a possible detection of TeV gamma-ray emission. On its optical image, obtained with the HST WFPC2, the active nucleus is displaced from the center of the host galaxy, which exhibits an apparent one-armed spiral structure extended to 16 kpc. The remarkable hybrid behavior of this object presents a challenge to current models of NLS1 galaxies and $γ$-ray blazars.
description: 12 pages, 2 figures. Accepted to ApJL
Radio-Excess IRAS Galaxies: IV. Optical Spectroscopy
Creators: name: Buchanan, Catherine L.
name: McGregor, Peter J.
name: Bicknell, Geoffrey V.
name: Dopita, Michael A.
Publisher: name: arXiv
Year: 2006
Subjects: subject: Astrophysics (astro-ph)
subject: FOS: Physical sciences

description: This is the fourth in our series of papers investigating radio-excess galaxies, which have radio emission associated with an active nucleus but which do not fit into the traditional categories of either radio-loud or radio-quiet active galaxies. In this paper, we present optical spectra of our sample of FIR-luminous radio-excess galaxies. Optical emission line diagnostics are used to determine the dominant source of the ionizing radiation. We find that radio excess is an excellent indicator of the presence of an active nucleus: the radio-excess sample contains a much higher fraction of AGN than samples selected on FIR luminosity alone, or using other criteria such as warm FIR colors. Several objects have ambiguous classifications and are likely to be composite objects with mixed excitation. The type of optical spectrum appears to be associated with the radio-loudness: radio-loud objects may be more `pure' AGN than radio-intermediate objects. We find strong evidence for interaction between the radio plasma and the surrounding gas. The jet energy fluxes of the radio-excess objects, inferred from the [O III] luminosities, are lower than in powerful radio sources, consistent with our previous results. We conclude that the jets of radio-intermediate sources are intrinsically weaker than those in sources with more powerful radio emission. A significant fraction of the sample spectra show post-starburst stellar continuum, with A-star absorption lines, consistent with the large fraction of merging or disturbed host galaxies in the sample. The ages of the radio sources are significantly less than those of A stars indicating that, if the radio sources are associated with merging activity, there is a delay between the interaction and the initiation of the radio activity. (Abridged.)
description: Accepted for publication in AJ; version with high resolution figures available from http://www.cis.rit.edu/~clbsps/papers/paper4.pdf
Correlation energy and quantum correlations in a solvable model
Creators: name: Faba, Javier
name: Martín, Vicente
name: Robledo, Luis
Publisher: name: arXiv
Year: 2021
Subjects: subject: Quantum Physics (quant-ph)
subject: Nuclear Theory (nucl-th)
subject: FOS: Physical sciences

description: Typically in many-body systems the correlation energy, which is defined as the difference between the exact ground state energy and the mean-field solution, has been a measure of the system's total correlations. However, under the quantum information context, it is possible to define some quantities in terms of the system's constituents that measure the classical and quantum correlations, such as the entanglement entropy, mutual information, quantum discord, one-body entropy, etc. In this work, we apply concepts of quantum information in fermionic systems in order to study traditional correlation measures (the relative correlation energy) from a novel approach. Concretely, we analyze the two and three level Lipkin models, which are exactly solvable (but non trivial) models very used in the context of the many-body problem.
description: 8 pages, 8 figures
Formation of Five-Dimensional String Solutions from the Gravitational Collapse
Creators: name: Hyun, Seungjoon
name: Jeong, Jaehoon
name: Kim, Wontae
name: Oh, John J.
Publisher: name: arXiv
Year: 2007
Subjects: subject: General Relativity and Quantum Cosmology (gr-qc)
subject: High Energy Physics - Theory (hep-th)
subject: FOS: Physical sciences

description: We study the formation of five-dimensional string solutions including the Gregory-Laflamme (GL) black string, the Kaluza-Klein (KK) bubble, and the geometry with a naked singularity from the gravitational collapse. The interior solutions of five-dimensional Einstein equations describe collapsing non-isotropic matter clouds. It is shown that the matter cloud always forms the GL black string solution while the KK bubble solution cannot be formed. The numerical study seems to suggest that the collapsing matter forms the geometries with timelike naked curvature singularities, which should be taken cautiously as the general relativity is not reliable in the strong curvature regime.
description: 17 pages, 10 figures, LaTeX, to appear in Class. Quant. Grav., a appendix and some discussions added, title changed
Actionable Principles for Artificial Intelligence Policy: Three Pathways
Creators: name: Stix, Charlotte
Publisher: name: arXiv
Year: 2021
Subjects: subject: Computers and Society (cs.CY)
subject: FOS: Computer and information sciences

description: In the development of governmental policy for artificial intelligence (AI) that is informed by ethics, one avenue currently pursued is that of drawing on AI Ethics Principles. However, these AI Ethics Principles often fail to be actioned in governmental policy. This paper proposes a novel framework for the development of Actionable Principles for AI. The approach acknowledges the relevance of AI Ethics Principles and homes in on methodological elements to increase their practical implementability in policy processes. As a case study, elements are extracted from the development process of the Ethics Guidelines for Trustworthy AI of the European Commissions High Level Expert Group on AI. Subsequently, these elements are expanded on and evaluated in light of their ability to contribute to a prototype framework for the development of Actionable Principles for AI. The paper proposes the following three propositions for the formation of such a prototype framework: (1) preliminary landscape assessments; (2) multi-stakeholder participation and cross-sectoral feedback; and, (3) mechanisms to support implementation and operationalizability.
Object properties: a mechanism for providing runtime services to objects in a distributed system
Creators: name: Finkelstein, David
Publisher: name: University of British Columbia
Year: 2009

description: Object-oriented systems are increasingly used as a means to develop distributed applications. Objects provide a natural unit of encapsulation for remote data, and the system can make remote invocations transparent to local users. Generally the underlying system provides a variety of services to objects in the system, such as persistence or concurrency control, which are used by developers of distributed applications. There are problems with existing mecha nisms for providing such services, however: they may require the programmer to design a dif ferent subclass of each user class for every service available, limit the choices of services available, or inhibit performance by providing services to all objects even when not every sevice is needed. The work in this thesis attempts to solve these problems through a new mechanism for providing services to objects called properties. Properties allow services to be delivered transparently to objects on an as-requested basis. Additionally, a mechanism for describing inter-object relationships has been incorporated into the property scheme, allowing properties to be used to provide complex services such as atomic transactions. Properties were developed for the Raven distributed system and language developed in the Department of Computer Science at the University of British Columbia.
Σχέδιο ορολογίας ΙΑΤΕ στον τομέα των υλικών συσκευασίας
Creators: name: Νικολαΐδου, Γεωργία Βασιλείου
Publisher: name: Aristotle University of Thessaloniki
Year: 2017
Subjects: ορολογία
υλικά συσκευασίας
εύκαμπτη συσκευασία
terminology
packaging materials
flexible packaging

description: Το σχέδιο ορολογίας ΙΑΤΕ πραγματοποιήθηκε στο πλαίσιο εκπόνησης της διπλωματικής μου εργασίας για την απόκτηση του τίτλου μεταπτυχιακών σπουδών μετάφρασης του Α.Π.Θ. και είχε ως στόχο την εύρεση όρων και εννοιών που αφορούν τον τομέα των υλικών συσκευασίας (πεδίο) και συγκεκριμένα της εύκαμπτης συσκευασίας (υποπεδίο). Ειδικότερα, το σχέδιο ορολογίας ΙΑΤΕ αποτελείται από 50 όρους συσκευασίας, καταγεγραμμένους σε λογιστικό φύλλο excel, και τη θεωρητική παρουσίαση της αποδελτίωσής τους. Τα πεδία που περιλαμβάνονται στο λογιστικό φύλλο excel αφορούν το ζεύγος γλωσσών αγγλικά-ελληνικά και είναι τα εξής: όρος, πηγή όρου, ορισμός, πηγή ορισμού, συγκείμενο, πηγή συγκειμένου, σχέση όρου με τους υπόλοιπους και (τυχόν) παρατηρήσεις. Το σχέδιο ορολογίας ΙΑΤΕ εκπονήθηκε σε συνεργασία με την Termcoord και βασίστηκε στον εννοιολογικό χάρτη της βάσης δεδομένων ορολογίας WIPO PEARL, ο οποίος αφορά τα υλικά συσκευασίας. Συγκεκριμένα, στη θεωρητική παρουσίαση δίνονται πληροφορίες για το πεδίο και το υποπεδίο, καθώς και τα έργα αναφοράς, τα λεξικά και τις πηγές που χρησιμοποιήθηκαν καθ’ όλη τη διάρκεια της έρευνας. Επιπλέον, σημειώνονται οι βασικοί όροι του πεδίου και οι μεταξύ τους σχέσεις, οι οποίες αναπαριστώνται με τη βοήθεια γραφημάτων. Στη συνέχεια, περιγράφονται η ερευνητική διαδικασία και οι δυσκολίες που προέκυψαν, ενώ παρατίθενται τα λογιστικά φύλλα του excel και δείγμα από το σώμα αυθεντικών κειμένων που χρησιμοποιήθηκε
description: The IATE terminology project was conducted in the framework of preparing my thesis for the postgraduate diploma in translation of Aristotle University of Thessaloniki and aimed at finding terms and concepts related to packaging materials (domain) and flexible packaging (subdomain). More specifically, the IATE terminology project consists of 50 terms of packaging, listed in an excel spreadsheet, and a theoretical presentation of their indexing. Fields included in the excel spreadsheet concern the language pair English-Greek and are the following: term, term reference, definition, definition reference, context, context reference, cross reference and (if applicable) comments. The IATE terminology project was prepared in collaboration with Termcoord and was based on the concept map of WIPO PEARL on packaging materials. The theoretical presentation provides information about the domain and subdomain, and the references, dictionaries and sources used throughout the research. The most important terms of the domain and the relationships between them are also presented by means of graphs. The research process and the difficulties encountered are described in the final chapter of the presentation, where the excel spreadsheets and a sample of the authentic texts corpus used are also included
A theoretical investigation into the trapping of noble gases by clathrates on Titan
Creators: name: Thomas, Caroline
name: Picaud, Sylvain
name: Mousis, Olivier
name: Ballenegger, Vincent
Publisher: name: arXiv
Year: 2008
Subjects: subject: Astrophysics (astro-ph)
subject: FOS: Physical sciences

description: In this paper, we use a statistical thermodynamic approach to quantify the efficiency with which clathrates on the surface of Titan trap noble gases. We consider different values of the Ar, Kr, Xe, CH4, C2H6 and N2 abundances in the gas phase that may be representative of Titan's early atmosphere. We discuss the effect of the various parameters that are chosen to represent the interactions between the guest species and the ice cage in our calculations. We also discuss the results of varying the size of the clathrate cages. We show that the trapping efficiency of clathrates is high enough to significantly decrease the atmospheric concentrations of Xe and, to a lesser extent, of Kr, irrespective of the initial gas phase composition, provided that these clathrates are abundant enough on the surface of Titan. In contrast, we find that Ar is poorly trapped in clathrates and, as a consequence, that the atmospheric abundance of argon should remain almost constant. We conclude that the mechanism of trapping noble gases via clathration can explain the deficiency in primordial Xe and Kr observed in Titan's atmosphere by Huygens, but that this mechanism is not sufficient to explain the deficiency in Ar.
description: Accepted for publication in Planetary and Space Science
Detection of preventable fetal distress during labor from scanned cardiotocogram tracings using deep learning
Creators: name: Frasch, Martin G.
name: Strong, Shadrian B.
name: Nilosek, David
name: Leaverton, Joshua
name: Schifrin, Barry S.
Publisher: name: arXiv
Year: 2021
Subjects: subject: Quantitative Methods (q-bio.QM)
subject: Machine Learning (cs.LG)
subject: FOS: Biological sciences
subject: FOS: Computer and information sciences

description: Despite broad application during labor and delivery, there remains considerable debate about the value of electronic fetal monitoring (EFM). EFM includes the surveillance of the fetal heart rate (FHR) patterns in conjunction with the maternal uterine contractions providing a wealth of data about fetal behavior and the threat of diminished oxygenation and perfusion. Adverse outcomes universally associate a fetal injury with the failure to timely respond to FHR pattern information. Historically, the EFM data, stored digitally, are available only as rasterized pdf images for contemporary or historical discussion and examination. In reality, however, they are rarely reviewed systematically. Using a unique archive of EFM collected over 50 years of practice in conjunction with adverse outcomes, we present a deep learning framework for training and detection of incipient or past fetal injury. We report 94% accuracy in identifying early, preventable fetal injury intrapartum. This framework is suited for automating an early warning and decision support system for maintaining fetal well-being during the stresses of labor. Ultimately, such a system could enable a physician to timely respond during labor and prevent adverse outcomes. When adverse outcomes cannot be avoided, they can provide guidance to the early neuroprotective treatment of the newborn.
Σχεδίαση και Υλοποίηση Διεπαφής REST με Σύστημα Διαχείρισης Ροής Εργασίας BPMN
Creators: name: Τσακιρίδης, Σωτήριος Φώτιος Κωνσταντίνου
Publisher: name: Aristotle University of Thessaloniki
Year: 2017
Subjects: Σύστημα Διαχείρισης Επιχειρηματικών Διαδικασιών
Τεχνολογία REST
Σύστημα ενδοεπιχειρησιακού σχεδιασμού
Business Process Management System
Restful Web Services
ERP (Entreprise Resource Planning)

description: Ο τίτλος της παρούσας διπλωματικής εργασίας είναι: Σχεδίαση και Υλοποίηση Διεπαφής REST με Σύστημα Διαχείρισης Ροής Εργασίας BPMN. Αρχικά, αρχικός σκοπός είναι η μοντελοποίηση και η εκτέλεση μιας επιχειρηματικής διαδικασίας μέσω ενός λογισμικού διαχείρισης επιχειρηματικών διαδικασιών και ακολούθως, η αξιοποίηση του REST API που παρέχει ένα τέτοιο λογισμικό, ώστε η διαδικασία να εκτελείται εξ ολοκλήρου από τον τελικό χρήστη μέσω μιας εξωτερικής εφαρμογής, όπως είναι ο ιστότοπος ενός οργανισμού, χωρίς να υπάρχει η ανάγκη σύνδεσης στην πλατφόρμα του λογισμικού για την εκτέλεση των διαδικασιών. Για να αναδειχθεί η παραπάνω λειτουργικότητα, σχεδιάστηκε, δημιουργήθηκε κι εγκαταστάθηκε η εφαρμογή διαδικασίας «Αίτηση αδείας μέλους ΔΕΠ»
description: The title of this thesis is: Designing and Building a REST Client using Business Process Management System BPMN. Firstly, the aim is to model and execute a business process through the interface of a BPM Software and then, to make use of the rest API, provided by the BPM Software so that the designed business process can be fully executed through an external application, like a web site of an organization, by the end-user without him needing to log in to BPM Software. In order to demonstrate its functionality, “a leave of absence request by a Professor” process application designed, built and deployed
description: Σε συνεργασία με το τμήμα Λογιστικής και Χρηματοοικονομικής (Πανεπιστήμιο Μακεδονίας)
Additional file 25 of Genome-wide identification, classification, and expression analysis of the JmjC domain-containing histone demethylase gene family in birch
Creators: name: Chen, Bowei
name: Ali, Shahid
name: Zhang, Xu
name: Zhang, Yonglan
name: Wang, Min
name: Zhang, Qingzhu
name: Xie, Linan
Publisher: name: figshare
Year: 2021
Subjects: subject: Genetics
subject: FOS: Biological sciences

description: Additional file 25: Figure S9. GO enrichment (MF) analysis of BpJMJ directly associated genes in co-expression network.