cometadata/datacite-rtg-text-other-reclassification-records huggingface dataset:
Bleu blanc noir : assimilation trajectories, identity dynamics and boundary work of French Antilleans, West Africans, and their children in Paris
Creators: name: Ivemark, Biorn
Publisher: name: University of British Columbia
Year: 2017

description: This study compares the assimilation trajectories, identity dynamics and boundary work of French Antilleans, West Africans and their descendants in the Paris region. While previous studies have focused on the experiences of French Antilleans and sub-Saharan Africans separately or those of Blacks in France as a whole, this study engages in a more minute comparison of the experiences of West African immigrants and French Antilleans across two generations in mainland France. This comparison primarily aims to determine the role of the divergent civic, cultural and religious backgrounds of these groups alongside their largely shared racial characteristics in how they assimilate to French society across two generations. These variables are of particular interest given the salience of civic and cultural distinctions in France, while racial distinctions are notoriously downplayed. The main theoretical goal of the study is to assess the usefulness of segmented assimilation theory in accounting for the various assimilation outcomes of these groups. Drawing on 55 in-depth interviews complemented with wide-ranging statistical data, I explore the impact of cultural, religious and racial factors on the intergenerational educational and professional trajectories of both populations, analyze how these factors influence their identification patterns and assess how members of these groups seek to negotiate the various symbolic boundaries that they come up against, both in their relations to each other and to the majority population. The results suggest that French Antilleans have more favourable educational and professional outcomes than West Africans. Despite the importance of racial barriers for both groups, the findings also underscore the salience of cultural and religious forces as well as the identification dynamics and boundary work that both groups engage in. While some segmented assimilation mechanisms remain valid in the French case, the study also demonstrates the importance of empirically identifying societally specific assimilation barriers and cultural segments for the theory to retain its usefulness in other national contexts.
Tunable bandgaps and excitons in doped semiconducting carbon nanotubes made possible by acoustic plasmons
Creators: name: Spataru, Catalin D.
name: Léonard, François
Publisher: name: arXiv
Year: 2010
Subjects: subject: Materials Science (cond-mat.mtrl-sci)
subject: FOS: Physical sciences

description: Doping of semiconductors is essential in modern electronic and photonic devices. While doping is well understood in bulk semiconductors, the advent of carbon nanotubes and nanowires for nanoelectronic and nanophotonic applications raises some key questions about the role and impact of doping at low dimensionality. Here we show that for semiconducting carbon nanotubes, bandgaps and exciton binding energies can be dramatically reduced upon experimentally relevant doping, and can be tuned gradually over a broad range of energies in contrast to higher dimensional systems. The later feature is made possible by a novel mechanism involving strong dynamical screening effects mediated by acoustic plasmons.
description: 5 pages, 4 figures, published in Phys. Rev. Lett.
Gate-defined coupled quantum dots in topological insulators
Creators: name: Ertler, Christian
name: Raith, Martin
name: Fabian, Jaroslav
Publisher: name: Universität Regensburg
Year: 2014
Subjects: subject: topological insulators, quantum dots
subject: 530 Physik

description: We consider electrostatically coupled quantum dots in topological insulators, otherwise confined and gapped by a magnetic texture. By numerically solving the (2 + 1) Dirac equation for the wave packet dynamics, we extract the energy spectrum of the coupled dots as a function of bias-controlled coupling and an external perpendicular magnetic field. We show that the tunneling energy can be controlled to a large extent by the electrostatic barrier potential. Particularly interesting is the coupling via Klein tunneling through a resonant valence state of the barrier. The effective three-level system nicely maps to a model Hamiltonian, from which we extract the Klein coupling between the confined conduction and valence dots levels. For large enough magnetic fields Klein tunneling can be completely blocked due to the enhanced localization of the degenerate Landau levels formed in the quantum dots.
A Hierarchy of Local Symplectic Filling Obstructions for Contact 3-Manifolds
Creators: name: Wendl, Chris
Publisher: name: arXiv
Year: 2010
Subjects: subject: Symplectic Geometry (math.SG)
subject: Geometric Topology (math.GT)
subject: FOS: Mathematics
subject: Primary 57R17, Secondary 53D10, 32Q65, 53D42

description: We generalize the familiar notions of overtwistedness and Giroux torsion in 3-dimensional contact manifolds, defining an infinite hierarchy of local filling obstructions called planar torsion, whose integer-valued order $k \ge 0$ can be interpreted as measuring a gradation in "degrees of tightness" of contact manifolds. We show in particular that any contact manifold with planar torsion admits no contact type embeddings into any closed symplectic 4-manifold, and has vanishing contact invariant in Embedded Contact Homology, and we give examples of contact manifolds that have planar k-torsion for any $k \ge 2$ but no Giroux torsion. We also show that the complement of the binding of a supporting open book never has planar torsion. The unifying idea in the background is a decomposition of contact manifolds in terms of contact fiber sums of open books along their binding. As the technical basis of these results, we establish existence, uniqueness and compactness theorems for certain classes of J-holomorphic curves in blown up summed open books; these also imply algebraic obstructions to planarity and embeddings of partially planar domains. The results are applied further in followup papers on weak symplectic fillings (arXiv:1003.3923, joint with K. Niederkrueger), non-exact symplectic cobordisms (arXiv:1008.2456) and Symplectic Field Theory (arXiv:1009.3262, joint with J. Latschev).
description: 65 pages, lots of figures; this is actually a rewrite of the preprint formerly known as "Holomorphic Curves in Blown Up Open Books" (arXiv:1001.4109), with considerable reorganization and a few new results added (e.g. planarity obstructions); v.3 incorporates several improvements and corrections suggested by the referees; to appear in Duke Math. J
Spectral Remittances of Chiral Sculptured Zirconia Thin Films in Non-axial propagation
Creators: name: Babaei, Ferydon
name: Savaloni, Hadi
Publisher: name: arXiv
Year: 2010
Subjects: subject: Optics (physics.optics)
subject: FOS: Physical sciences

description: The transmission and reflection spectra from a right-handed chiral sculptured zirconia thin film are calculated using the piecewise homogeneity approximation method and the Bruggeman homogenization formalism and considering that the dispersion of dielectric function happens in non-axial propagation state. First and second Bragg peaks were observed in cross-poloraized reflectances and it became clear that increasing the azimutal angle affects the spectra of linearly polarized state significantly. This is opposite to circularly polarized state.
description: 22pages,8pages
Letter to Kirk from John S. Casler (Law '70)
Creators: name: (:Unav)
Publisher: name: Columbia University
Year: 2016
Subjects: Student Strike (Columbia University : 1968)

description: Type written letter to Kirk from John Casler, anti-bust. Letter dated April 2, 1968 but probably meant to write May 2, 1968 based on content of letter.
Replication Package of PDM Observational Study
Creators: name: Mendonça, Diogo
name: von Staa, Arndt
name: Kalinowski, Marcos
Publisher: name: Zenodo
Year: 2019
Subjects: Patterns, Defects, Unhandled Exceptions

description: Replication Package of Pattern-Driven Maintenance (PDM) Observational Study. This package consists of study materials to replicate an observational study conducted to evaluate maintainers effectiveness in applying PDM and their acceptance of the method.
Retrieval Practice Enhances New Learning: the Forward Effect of Testing
Creators: name: Pastötter, Bernhard
name: Bäuml, Karl-Heinz T.
Publisher: name: Universität Regensburg
Year: 2014
Subjects: subject: learning,longtermmemory,testingeffect,retrievalpractice,interference
subject: 150 Psychologie

description: Inthelastcoupleofyears,therehasbeenadramaticincreaseinlaboratoryresearchexaminingthebenefitsofrecalltestingonlong-termlearningandretention.Thisworkwaslargelyonthebackwardeffectoftesting,whichshowsthatretrievalpracticeonpreviouslystudiedinformation,comparedtorestudyofthesamematerial,renderstheinformationmorelikelytoberememberedinthefuture.Goingbeyondthisprominentwork,morerecentlaboratoryresearchprovidedevidencethatthereisalsoaforwardeffectoftesting,whichshowsthatrecalltestingofpreviouslystudiedinformationcanenhancelearningofsubsequentlypresentednewinformation.Here,weprovideareviewofresearchonthisforwardeffectoftesting.Thereviewshowsthattheeffectisawellreplicatedphenomenoninlaboratorystudiesthathasbeenobservedforbothveridicalinformationandmisinformation.Inparticular,thereviewdemonstratesthattheeffectmaybeappliedtoeducationalandclinicalsettings,enhancinglearninginstudentsandreducingmemorydeficitsinclinicalpopulations.Thereviewdiscussescurrenttheoreticalexplanationsoftheforwardeffectoftestingandprovidessuggestionsforfutureresearchdirections.
Link Delay Estimation via Expander Graphs
Creators: name: Firooz, Mohammad H.
name: Roy, Sumit
Publisher: name: arXiv
Year: 2011
Subjects: subject: Networking and Internet Architecture (cs.NI)
subject: Information Theory (cs.IT)
subject: FOS: Computer and information sciences

description: One of the purposes of network tomography is to infer the status of parameters (e.g., delay) for the links inside a network through end-to-end probing between (external) boundary nodes along predetermined routes. In this work, we apply concepts from compressed sensing and expander graphs to the delay estimation problem. We first show that a relative majority of network topologies are not expanders for existing expansion criteria. Motivated by this challenge, we then relax such criteria, enabling us to acquire simulation evidence that link delays can be estimated for 30% more networks. That is, our relaxation expands the list of identifiable networks with bounded estimation error by 30%. We conduct a simulation performance analysis of delay estimation and congestion detection on the basis of l1 minimization, demonstrating that accurate estimation is feasible for an increasing proportion of networks.
Spin hot spots in single-electron GaAs-based quantum dots
Creators: name: Raith, Martin
name: Pangerl, Thomas
name: Stano, Peter
name: Fabian, Jaroslav
Publisher: name: Universität Regensburg
Year: 2013
Subjects: subject: electron spin relaxation; nuclear spins; quantum dots; spin-orbit interaction; spin qubit
subject: 530 Physik

description: Spin relaxation of a single electron in a weakly coupled double quantum dot is calculated numerically. The phonon assisted spin flip is allowed by the presence of the linear and cubic spin-orbit couplings and nuclear spins. The rate is calculated as a function of the interdot coupling, the magnetic field strength and orientation, and the dot bias. In an in-plane magnetic field, the rate is strongly anisotropic with respect to the magnetic field orientation, due to the anisotropy of the spin-orbit interactions. The nuclear spin influence is negligible. In an out-of-plane field, the nuclear spins play a more important role due selection rules imposed on the spin-orbit couplings. Our theory shows a very good agreement with data measured in [Srinivasa, et al., PRL 110, 196803 (2013)], allowing us to extract information on the linear spin-orbit interactions strengths in that experiment. We estimate that they correspond to spin-orbit lengths of about 5-15 μm.
Entropy-driven enhanced self-diffusion in confined reentrant supernematics
Creators: name: Mazza, Marco G.
name: Greschek, Manuel
name: Valiullin, Rustem
name: Kärger, Jörg
name: Schoen, Martin
Publisher: name: arXiv
Year: 2010
Subjects: subject: Soft Condensed Matter (cond-mat.soft)
subject: FOS: Physical sciences

description: We present a molecular dynamics study of reentrant nematic phases using the Gay-Berne-Kihara model of a liquid crystal in nanoconfinement. At densities above those characteristic of smectic A phases, reentrant nematic phases form that are characterized by a large value of the nematic order parameter $S\simeq1$. Along the nematic director these "supernematic" phases exhibit a remarkably high self-diffusivity which exceeds that for ordinary, lower-density nematic phases by an order of magnitude. Enhancement of self-diffusivity is attributed to a decrease of rotational configurational entropy in confinement. Recent developments in the pulsed field gradient NMR technique are shown to provide favorable conditions for an experimental confirmation of our simulations.
description: 10 pages, 5 figures
Wetting on a spherical wall: influence of liquid-gas interfacial properties
Creators: name: Nold, Andreas
name: Malijevský, Alexandr
name: Kalliadasis, Serafim
Publisher: name: arXiv
Year: 2011
Subjects: subject: Statistical Mechanics (cond-mat.stat-mech)
subject: Mesoscale and Nanoscale Physics (cond-mat.mes-hall)
subject: FOS: Physical sciences

description: We study the equilibrium of a liquid film on an attractive spherical substrate for an intermolecular interaction model exhibiting both fluid-fluid and fluid-wall long-range forces. We first reexamine the wetting properties of the model in the zero-curvature limit, i.e., for a planar wall, using an effective interfacial Hamiltonian approach in the framework of the well known sharp-kink approximation (SKA). We obtain very good agreement with a mean-field density functional theory (DFT), fully justifying the use of SKA in this limit. We then turn our attention to substrates of finite curvature and appropriately modify the so-called soft-interface approximation (SIA) originally formulated by Napiórkowski and Dietrich [Phys. Rev. B 34, 6469 (1986)] for critical wetting on a planar wall. A detailed asymptotic analysis of SIA confirms the SKA functional form for the film growth. However, it turns out that the agreement between SKA and our DFT is only qualitative. We then show that the quantitative discrepancy between the two is due to the overestimation of the liquid-gas surface tension within SKA. On the other hand, by relaxing the assumption of a sharp interface, with, e.g., a simple smoothing of the density profile there, markedly improves the predictive capability of the theory, making it quantitative and showing that the liquid-gas surface tension plays a crucial role when describing wetting on a curved substrate. In addition, we show that in contrast to SKA, SIA predicts the expected mean-field critical exponent of the liquid-gas surface tension.
Semantic storage of climate data on object stores
Creators: name: Massey, Neil
name: Hassell, David
name: Lawrence, Bryan
Publisher: name: Zenodo
Year: 2018

description: Using object stores, and cloud based storage utilising the Amazon S3 HTTP API, presents a number of opportunities and challenges in the storing of climate data. The distributed nature of the objects allows large data sets to be broken into “fragments”, each fragment containing a subset of the data. This allows for parallel access to the fragments, improving the performance of reading the data across a network.

However, this presents a number of problems. Firstly, determining the fragment size and the optimum method of splitting multi-dimensional data. Secondly, enabling meaningful search of data, when the data may be widely distributed.This poster will present a new method of splitting netCDF files into fragments and storing each fragment as an object in an S3 compatible object store. The location of the fragments, the metadata and dimensions for each climate variable are stored in a master file, which can be written to a location not within the object store, for example a POSIX file system on a SSD. This allows fast search of the metadata without having to reassemble the fragments. Each fragment is stored as a self-contained netCDF file allowing reconstruction of the data if the master file is lost.
Position control of a floating offshore wind turbine system using aerodynamic force
Creators: name: Han, Chenlu
Publisher: name: University of British Columbia
Year: 2020

description: As a renewable and environmental-friendly energy source, wind energy has experienced a significant increase in its popularity. To take advantage of the stronger and steadier offshore wind resource, utility-scale floating wind turbine systems need to be deployed in offshore wind farms. To maximize the overall power production, the distribution layout of wind turbines in the wind farm should be optimized and updated in response of real-time wind direction changes. To achieve this goal, it requires both a wind farm level layout optimization algorithm for computing the optimal layout and a wind turbine level position controller for ensuring successfully position transfers. In this thesis, we first propose a mechanism to move the floating wind turbine by passively utilizing the aerodynamic thrust force from the wind. Advantages of this actuation mechanism include its general applicability and easy implementation to modern floating wind turbine systems, without the need for energy consumption and hardware modifications. Secondly, we introduce the concept of the movable range of a floating wind turbine which describes the feasible range of its equilibrium position under the constraints of the power requirement and safety limits. This movable range information is critical in the wind farm layout optimization algorithm as it determines the set of feasible layouts from which the optimal solution should be sought. A numerical algorithm is proposed to obtain the movable range of a wind turbine system, and the computed result is validated in widely-adopted wind turbine simulation software. In addition, the influences of wind speed and direction, required power, and catenary line length on the movable range are analyzed. Finally, three position controllers for the floating wind turbine, that is, a model-free controller, a model-based open-loop controller and a model-based state feedback controller, are designed. Their simulated control performances are compared in terms of position transfer, power regulation and vibration suppression. We demonstrate that it is possible to achieve the desired position transfer while maintaining a smooth and uninterrupted wind turbine operation.
The Planning and Control Model (PCM) of motorvisual priming: Reconciling motorvisual impairment and facilitation effects
Creators: name: Thomaschke, Roland
name: Hopkins, Brian
name: Miall, Christopher
Publisher: name: Universität Regensburg
Year: 2012
Subjects: subject: action planning; dual-tasks; motorvisual; movement control
subject: 150 Psychologie

description: Previous research on dual-tasks has shown that, under some circumstances, actions impair the perception of action-consistent stimuli, whereas, under other conditions, actions facilitate the perception of action-consistent stimuli. We propose a new model to reconcile these contrasting findings. The planning and control model (PCM) of motorvisual priming proposes that action planning binds categorical representations of action features so that their availability for perceptual processing is inhibited. Thus, the perception of categorically action-consistent stimuli is impaired during action planning. Movement control processes, on the other hand, integrate multi-sensory spatial information about the movement and, therefore, facilitate perceptual processing of spatially movement-consistent stimuli. We show that the PCM is consistent with a wider range of empirical data than previous models on motorvisual priming. Furthermore, the model yields previously untested empirical predictions. We also discuss how the PCM relates to motorvisual research paradigms other than dual-tasks.
Algorithmic Complexity for Short Binary Strings Applied to Psychology: A Primer
Creators: name: Gauvrit, Nicolas
name: Zenil, Hector
name: Delahaye, Jean-Paul
name: Soler-Toscano, Fernando
Publisher: name: arXiv
Year: 2011
Subjects: subject: Computational Complexity (cs.CC)
subject: FOS: Computer and information sciences
subject: 91E45

description: Since human randomness production has been studied and widely used to assess executive functions (especially inhibition), many measures have been suggested to assess the degree to which a sequence is random-like. However, each of them focuses on one feature of randomness, leading authors to have to use multiple measures. Here we describe and advocate for the use of the accepted universal measure for randomness based on algorithmic complexity, by means of a novel previously presented technique using the the definition of algorithmic probability. A re-analysis of the classical Radio Zenith data in the light of the proposed measure and methodology is provided as a study case of an application.
description: To appear in Behavior Research Methods
Performance Comparison and Analysis of Proactive, Reactive and Hybrid Routing Protocols for Wireless Sensor Networks
Creators: name: tabbana, faïza
Publisher: name: Zenodo
Year: 2020

description: Wireless Sensor networks are a challenging task due to the lack of resources in the network as well as thefrequent changes in network topology. Various routing protocols are designed basically to establishcorrect and efficient paths between source and destination. In the recent years, several routing protocolshave been proposed in literature and many of them studied through extensive simulation at differentnetwork characteristics. In this paper, we compare the performance of three most common routingprotocols of wireless sensor networks i.e. AODV, DSDV and ZRP. These protocols have been simulatedusing NS2 Package. This study investigates the routing protocols corresponding to packet delivery ratio,packet loss ratio, average throughput, dropped packets and end-to-end delay. Hence, evaluation andcomparison between routing protocols is required because performance of any routing protocol can bechanged with various parameters such as speed of nodes, pause times and number of nodes.
Improving the human computer dialogue with increased temporal predictability
Creators: name: Weber, Florian
name: Haering, Carola
name: Thomaschke, Roland
Publisher: name: Universität Regensburg
Year: 2013
Subjects: subject: 150 Psychologie

description: Objective: An experiment was conducted to investigate the impacts of length and variability of system response time (SRT) on user behavior and user experience (UX) in sequential computing tasks. Background: Length is widely considered to be the most important aspect of SRTs in human–computer interaction. Research on temporal attention shows that humans adjust to temporal structures and that performance substantially improves with temporal predictability. Method: Participants performed a sequential task with simulated office software. Duration and variability, that is, the number of different SRTs, was manipulated. Lower variability came at the expense of on average higher durations. User response times, task execution times, and failure rates were measured to assess user performance. UX was measured with a questionnaire. Results: A reduction in variability improved user performance significantly. Whereas task load and failure rates remained constant, responses were significantly faster. Although a reduction in variability came along with, on average, increased SRTs, no difference in UX was found. Conclusion: Considering SRT variability when designing software can yield considerable performance benefits for the users. Although reduced variability comes at the expense of overall longer SRTs, the interface is not subjectively evaluated to be less satisfactory or demanding. Time design should aim not only at reducing average SRT length but also at finding the optimum balance of length and variability. Application: Our findings can easily be applied in any user interface for sequential tasks. User performance can be improved without loss of satisfaction by selectively prolonging particular SRTs to reduce variability.
description: system response times, temporal variability, temporal attention, subjective task load, waiting times, human–computer interaction, user behavior, user experience
Political economy of energy in Eastern Mediterranean
Creators: name: Τσακανιά, Σωτηρία
name: Tsakania, Sotiria
Publisher: name: Πανεπιστήμιο Πειραιώς
Year: 2021
Subjects: subject: Political economy of energy
subject: Eastern Mediterranean
subject: Energy policy
subject: Energy trade
subject: Energy access

description: Σήμερα, οι πρόσφατες ανακαλύψεις των ενεργειακών αποθεμάτων της Νοτιοανατολικής Μεσογείου ταράζουν τις ισορροπίες ισχύος. Η εύρεση υδρογονανθράκων ακριβώς στο μέσο των δύο περιφερειακών συγκροτημάτων ασφαλείας, της Ευρώπης και της Μέσης Ανατολής, σε συνδυασμό με την προοπτική νέων πηγών εξαγωγής αερίου δημιουργούν ένα νέο, σύνθετο σκηνικό εθνικών ευκαιριών. Η ανάδειξη του φυσικού αερίου ως κυρίαρχου προϊόντος στην ενεργειακή πίτα έχει οδηγήσει στη μετατόπιση της γεωπολιτικής αξίας του πετρελαίου. Οι ενεργειακοί πόροι στη Μεσόγειο μπορούν να αποτελέσουν σημαντικό παράγοντα της επιχειρούμενης γεωπολιτικής αλλαγής. Τα παράκτια κράτη επιδιώκουν όλο και περισσότερο να επωφεληθούν από τις εξαγωγές των φυσικών πόρων, έχοντας πάντα ως πρωταρχικό σκοπό την εγγύηση της ενεργειακής τους ασφάλειας, αλλά και την αποκόμιση κερδών από το δικαίωμά τους να μεταφέρουν την ενέργεια και να κερδίσουν από την πώληση του φυσικού αερίου σε περιφερειακές αγορές κατανάλωσης. Ακόμη, αν και η περιοχή μαστίζεται από τις έντονες και μακροχρόνιες περιφερειακές αναταράξεις, οι εξελίξεις ευνόησαν την οικοδόμηση ενός περιβάλλοντος συνεργασίας σε πολλές περιπτώσεις και βοήθησαν τα κράτη να ενισχύσουν τους οικονομικούς και πολιτικούς δεσμούς τους. Οι ενδιαφερόμενες κυβερνήσεις άρχισαν να παίρνουν διάφορα μέτρα, να επιδίδονται σε ενεργειακά έργα και να διαμορφώνουν την νέα πολιτική τους. Ωστόσο, το κόστος εξερεύνησης στην Ανατολική Μεσόγειο είναι αρκετά υψηλό και απαιτεί πολλά χρόνια και όπως φαίνεται αναμένεται να έχει και περιορισμένα αποτελέσματα. Επίσης, υψηλός αναμένεται να είναι και ο ανταγωνισμός με άλλες διεθνείς εταιρείες ενέργειας, αφού στην περιοχή δραστηριοποιούνται και εξω-περιφερειακοί δρώντες. Η ίδια η ενέργεια από μόνη της δεν αποτελεί ισχυρό κίνητρο ειρήνευσης σε βαθιές και χρόνιες συγκρούσεις. Το κατά πόσο, τα κοιτάσματα θα αποφέρουν κέρδη στα ενδιαφερόμενα κράτη, είναι κάτι το οποίο θα καθοριστεί, από την επιτυχή και συνετή εκμετάλλευσή και διαχείριση της ενέργειας, από τους νόμιμους δικαιούχους, αλλά και από τη διαμόρφωση της ζήτησης και της προσφοράς.
Nonasymptotic bounds on the estimation error of MCMC algorithms
Creators: name: Łatuszyński, Krzysztof
name: Miasojedow, Błażej
name: Niemiro, Wojciech
Publisher: name: arXiv
Year: 2011
Subjects: subject: Methodology (stat.ME)
subject: Statistics Theory (math.ST)
subject: Computation (stat.CO)
subject: FOS: Computer and information sciences
subject: FOS: Mathematics

description: We address the problem of upper bounding the mean square error of MCMC estimators. Our analysis is nonasymptotic. We first establish a general result valid for essentially all ergodic Markov chains encountered in Bayesian computation and a possibly unbounded target function $f$. The bound is sharp in the sense that the leading term is exactly $σ_{\mathrm {as}}^2(P,f)/n$, where $σ_{\mathrm{as}}^2(P,f)$ is the CLT asymptotic variance. Next, we proceed to specific additional assumptions and give explicit computable bounds for geometrically and polynomially ergodic Markov chains under quantitative drift conditions. As a corollary, we provide results on confidence estimation.
description: Published in at http://dx.doi.org/10.3150/12-BEJ442 the Bernoulli (http://isi.cbs.nl/bernoulli/) by the International Statistical Institute/Bernoulli Society (http://isi.cbs.nl/BS/bshome.htm). arXiv admin note: text overlap with arXiv:0907.4915
Mechanisms of cognitive control: The functional role of task rules
Creators: name: Dreisbach, Gesine
Publisher: name: Universität Regensburg
Year: 2012
Subjects: subject: cognitive control, task shielding, task switching, task rules
subject: 150 Psychologie

description: Cognitive control enables humans to flexibly switch between different thoughts and actions. An important prerequisite for this cognitive flexibility is the human ability to form and apply general task rules. In this article, I review research investigating the functional role of task rules, with an emphasis on two main findings. First, the shielding function of task rules helps guide attention toward task-related information, thereby reducing possible distraction by irrelevant information. Second, this task shielding has to be relaxed when a task rule changes, thereby making the cognitive system more vulnerable to the intrusion of distracting information. Implications for developmental psychology and higher-level cognition are discussed.
The neurosurgical treatment of spasmodic dysphonia : thinking outside the voice box
Creators: name: Poologaindran, Anujan
Publisher: name: University of British Columbia
Year: 2019

description: Spasmodic Dysphonia (SD) is a neurological speech disorder characterized by sudden and involuntary contractions in the laryngeal musculature during speech production. In adductor SD (80-90% of cases), the vocal cords slam together and stiffen making it difficult to produce speech. As a result, an individual’s quality of life is impacted due to significant social embarrassment and the inability to work. Since the 1980s, the standard of care for SD has been to inject botulinum toxin A (BTX) into the affected laryngeal muscles thereby diminishing the spasms. Unfortunately, this therapy is limited by the delayed-onset of benefits, wearing-off effects, and repeated injections required every 3 months. To make a quantum leap in treating SD and providing patients with long-term therapy, the central neurological problem needs to be addressed and not the resultant peripheral spasms. Deep Brain Stimulation (DBS) is a neurosurgical therapy that repairs malfunctioning neural circuits giving rise to pathological behavior; DBS is the standard of care for movement disorders such as Parkinson’s disease and essential tremor (ET). In this thesis, we set out to investigate 1) which motor thalamic neural circuit required neuromodulation for SD, 2) if thalamic laryngeal control was lateralized, and for the first time, 3) if chronic subcortical electrical stimulation can provide long-term relief in SD. First, we systematically interrogated the pallidal and cerebellar inputs into the thalamus of an ET patient with coincident SD. Next, we studied n=6 with ET and coincident voice tremor to assessed if left, right, or both thalamic electrodes were crucial for vocal fold control. Finally, we launched a Phase 1 trial (DEBUSSY) on unilateral thalamic DBS for SD. Overall, we determined that unilateral left thalamic Vim DBS can safely and instantaneously abort laryngeal spasms in n=4 SD. There were no serious complications or adverse events to report. If voltage increased above the therapeutic range, dysarthria and contralateral dysmetria was induced but resolved with stimulation adjustment. Finally, the dentato-rubro-thalamic tract appears to be preferentially affected during DBS treatment for SD. Future work will characterize the long-term benefit of DBS in SD and further elucidate the mechanism by which DBS mediates improvement.
A Search For Supernova Remnants in The Nearby Spiral Galaxy M74 (NGC 628)
Creators: name: Sonbas, E.
name: Akyuz, A.
name: Balman, S.
name: Ozel, M. E.
Publisher: name: arXiv
Year: 2010
Subjects: subject: Astrophysics of Galaxies (astro-ph.GA)
subject: FOS: Physical sciences

description: We have identified nine new SNR candidates in M74 with [S II]/H$α$ $\geq$ 0.4 as the basic criterion. We obtain [S II]/H$α$ ratio in the range from 0.40 to 0.91 and H$α$ intensities from 2.8 $\times$ $10^{-15}$ erg cm$^{-2}$ s$^{-1}$ to 1.7 $\times$ $10^{-14}$ erg cm$^{-2}$ s$^{-1}$. We also present spectral follow-up observations of the SNR candidates and can confirm only three of them (SNR2, SNR3, and SNR5). The lack of confirmation for the rest might be due to the contamination by the nearby H II emission regions as well as due to the inaccurate positioning of the long slit on these objects. In addition, we search the $Chandra$ Observatory archival data for the X-ray counterparts to the optically identified candidates. We find positional coincidence with only three SNR candidates, SNR1, SNR2, and SNR8. The spectrum of SNR2 yields a shock temperature of 10.8 keV with an ionization timescale of 1.6 $\times$ 10$^{10}$ s cm$^{-3}$ indicating a relatively young remnant in an early Sedov phase which is not supported by our optical wavelength analysis. Given the high luminosity of 10$^{39}$ erg s$^{-1}$ and the characteristics of the X-ray spectrum, we favor an Ultra Luminous X-ray Source interpretation for this source associated with an SNR. We calculate an X-ray flux upper limit of 9.0 $\times$ $10^{-15}$ erg cm$^{-2}$ s$^{-1}$ for the rest of the SNRs including spectroscopically identified SNR3 and SNR5.
description: 10 pages, 8 figures, accepted to be published in A&A
Data management in the field: workshop
Creators: name: Thomas, Jen
Publisher: name: Zenodo
Year: 2021
Subjects: data management
polar
high-altitude
field work
good practice

description: Successful data management in the field begins with a solid understanding of good practice and thorough preparation. This workshop aims to provide an overview of good data management tips for those undertaking field work in polar regions. Topics covered are: good data management practice preparation before the field trip tips for managing data in the field dealing with data on return from the field This workshop is based on the document, "Data management in the field": https://doi.org/10.5281/zenodo.4185227 Change log v1.0 Original PDF upload v1.1 Upload ODP file v1.2 Reformat presentation. Update material. Convert file to FODP and output as PDF.
Variational Lie derivative and cohomology classes
Creators: name: Palese, Marcella
name: Winterroth, Ekkehart
Publisher: name: arXiv
Year: 2011
Subjects: subject: Mathematical Physics (math-ph)
subject: FOS: Physical sciences

description: We relate cohomology defined by a system of local Lagrangian with the cohomology class of the system of local variational Lie derivative, which is in turn a local variational problem; we show that the latter cohomology class is zero, since the variational Lie derivative `trivializes' cohomology classes defined by variational forms. As a consequence, conservation laws associated with symmetries ensuring the vanishing of the second variational derivative of a local variational problem are globally defined.
description: 7 pages, misprints in Corollary 2 and a misleading in the abstract and the introduction corrected, XIX International Fall Workshop on Geometry and Physics
Comparative Study Between Dispersive and Non-Dispersive Dielectric Permittivity in Spectral Remittances of Chiral Sculptured Zirconia Thin Films
Creators: name: Babaei, Ferydon
name: Savaloni, Hadi
Publisher: name: arXiv
Year: 2010
Subjects: subject: Optics (physics.optics)
subject: FOS: Physical sciences

description: The transmission and reflection spectra from a right-handed chiral sculptured zirconia thin film are calculated using the piecewise homogeneity approximation method and the Bruggeman homogenization formalism by considering that the propagation of both dispersive and non-dispersive dielectric function occurs for axial and non-axial states. The comparison of spectral results shows that the dispersion of the dielectric function has a considerable effect on the results. In axial excitation of cross-polarized reflectances and co-polarized transmittances the dispersion effect becomes more pronounced at wavelengths further away from the homogenization wavelength. This is also true in case of non-axial excitation of circular transmittances, while there are considerable differences for cross-polarized reflectances where (wavelength) the first Bragg peak occurs. At wavelengths in the vicinity of the homogenization wavelength the dispersion effect of the dielectric function in becomes more significant.
description: 23 pages,10 figures
Using Topological Insulator Proximity to Generate Perfectly Conducting Channels in Materials without Topologie Protection
Creators: name: Essert, Sven
name: Krueckl, Viktor
name: Richter, Klaus
Publisher: name: Universität Regensburg
Year: 2014
Subjects: subject: 530 Physik

description: We show that hybrid structures of topological insulators and materials without topological protection can be employed to create perfectly conducting channels hosted in the non-topological part. These states inherit the topological protection from the proximity of the topological insulator but are more fragile to time-reversal symmetry breaking because of their extended character. We explore their formation in the band structure of model hybrid systems as well as realistic heterostructures involving HgTe/CdTe-based two-dimensional topological insulators. Using numerical quantum transport calculations for the HgTe/CdTe material system we propose two experimental settings which allow for the detection of the induced perfectly conducting channels, both in the localized and diffusive regime, by means of magneto conductance and shot noise.
Magneto-photoluminescence of InAs/InGaAs/InAlAs Quantum well structures
Creators: name: Terent'ev, Ya. V.
name: Danilov, S. N.
name: Loher, Josef
name: Schuh, Dieter
name: Bougeard, Dominique
name: Weiss, Dieter
name: Durnev, M. V.
name: Tarasenko, S. A.
name: Mukhin, M. S.
name: Ivanov, S. V.
name: Ganichev, S. D.
Publisher: name: Universität Regensburg
Year: 2014
Subjects: subject: 530 Physik

description: Photoluminescence (PL) and highly circularly polarized magneto-PL (up to 50% at 6 T) from two-step bandgap InAs/InGaAs/InAlAs quantum wells (QWs) are studied. Bright PL is observed up to room temperature, indicating a high quantum efficiency of the radiative recombination in these QWs. The sign of the circular polarization indicates that it stems from the spin polarization of heavy holes caused by the Zeeman effect. Although in magnetic field the PL lines are strongly circularly polarized, no energy shift between the counter-polarized PL lines was observed. The results suggest the electron and the hole g-factor to be of the same sign and close magnitudes.
Smoothness of the law of manifold-valued Markov processes with jumps
Creators: name: Picard, Jean
name: Savona, Catherine
Publisher: name: arXiv
Year: 2011
Subjects: subject: Probability (math.PR)
subject: FOS: Mathematics

description: Consider on a manifold the solution $X$ of a stochastic differential equation driven by a Lévy process without Brownian part. Sufficient conditions for the smoothness of the law of $X_t$ are given, with particular emphasis on noncompact manifolds. The result is deduced from the case of affine spaces by means of a localisation technique. The particular cases of Lie groups and homogeneous spaces are discussed.
Associated Press-NORC Center for Public Affairs Research Poll: Americans’ Plans for Summer Vacation
Creators: name: Research, The Associated Press-NORC Center For Public Affairs
Publisher: name: Roper Center for Public Opinion Research
Year: 2019

description: Planning to take summer vacation (2); planning to go away/stay at home (1); expected cost of vacation (1); mode of transportation to vacation destination (1); vacation accommodations (1); planning to travel alone/with others (4); would prefer shorter, more luxurious/longer, less luxurious vacation (1); paid vacation days from work (2); disconnecting from internet while on vacation (1); extending business trips and turning them into vacations (1); checking in with work while on vacation (1); importance of various vacation activities (6); whether various activities are a true vacation (4); government regulation of airline industry (6); frequency of flying on commercial airplane (1).
Semantic storage of climate data on object stores
Creators: name: Massey, Neil
Publisher: name: Zenodo
Year: 2018

description: Using object stores, and cloud based storage utilising the Amazon S3 HTTP API, presents a number of opportunities and challenges in the storing of climate data. The distributed nature of the objects allows large data sets to be broken into “fragments”, each fragment containing a subset of the data. This allows for parallel access to the fragments, improving the performance of reading the data across a network.

However, this presents a number of problems. Firstly, determining the fragment size and the optimum method of splitting multi-dimensional data. Secondly, enabling meaningful search of data, when the data may be widely distributed.This poster will present a new method of splitting netCDF files into fragments and storing each fragment as an object in an S3 compatible object store. The location of the fragments, the metadata and dimensions for each climate variable are stored in a master file, which can be written to a location not within the object store, for example a POSIX file system on a SSD. This allows fast search of the metadata without having to reassemble the fragments. Each fragment is stored as a self-contained netCDF file allowing reconstruction of the data if the master file is lost.
Altersfreundliche Quartiere
Creators: name: Gretler Heusser, Simone
Publisher: name: Zenodo
Year: 2016
Subjects: Altersfreundliche Quartiere
Partizipation
Healthy Ageing

description: Möglichst lange in der eigenen Wohnung bleiben können. Auch im Alter noch selbständig unterwegs sein können. Und vor allem: Auch im Alter noch dazugehören, sich nicht überflüssig fühlen. So lassen sich die Aussagen von Menschen zusammenfassen, die nach ihren Bedürfnissen im Alter gefragt werden.
description: + ID der Publikation: hslu_44427 + Art des Beitrages: Fachmedien + Jahrgang: 2016 + Sprache: Deutsch + Letzte Aktualisierung: 2019-03-19 09:06:20
Institutional framework for a power generation unit under energy community
Creators: name: Παπαθανασίου, Αιμιλία
name: Papathanasiou, Aimilia
Publisher: name: Πανεπιστήμιο Πειραιώς
Year: 2021
Subjects: subject: Energy communities
subject: Institutional framework
subject: Energy policy

description: Αντικείμενο της παρούσας διπλωματικής εργασίας είναι η διερεύνηση του νομοθετικού πλαισίου που διέπει τις Ενεργειακές Κοινότητες (E. Κοιν. ). Σε παγκόσμιο επίπεδο, τα ενεργειακά συστήματα υφίστανται μια θεμελιώδη αλλαγή λόγω της κλιματικής αλλαγής και της εξάντλησης των ορυκτών καυσίμων. Ο αριθμός των τοπικών ενεργειακών πρωτοβουλιών αυξάνεται συνεχώς και ο αριθμός των επιχειρηματικών μοντέλων που επικεντρώνονται στους τελικούς χρήστες διευρύνεται. Ο νόμος 4513/2018 για τις Ενεργειακές Κοινότητες αποτελεί το ελληνικό ολοκληρωμένο θεσμικό πλαίσιο που αποσκοπεί κυρίως στην προώθηση μιας κοινωνικής και σταθερής ενεργειακής οικονομίας. Οι Ενεργειακές Κοινότητες (E. Κοιν. ) είναι αστικοί συνεταιρισμοί με αποκλειστικό σκοπό την προώθηση της κοινωνικής και αλληλέγγυας οικονομίας, καθώς και της καινοτομίας στον τομέα της ενέργειας. Η διατριβή παρέχει έναν ολοκληρωμένο ορισμό, ανάλυση και στη συνέχεια οικονομικά κίνητρα και υποστηρικτικά μέτρα που πρέπει να προβλεφθούν για τα αντικείμενα δράσης που μπορεί να έχει η ενεργειακή κοινότητα. Είναι μια μέθοδος για την καταπολέμηση της ενεργειακής φτώχειας, την εξοικονόμηση ενέργειας, τη χρήση ανανεώσιμων πηγών και την αύξηση της τοπικής αποδοχής. Τα κύρια πλεονεκτήματά της περιλαμβάνουν τη δυνατότητα συνεργειών μεταξύ πολιτών, επιχειρήσεων και τοπικών αρχών, οι οποίες είναι πρόθυμες να δραστηριοποιηθούν στον τομέα της ενέργειας. Πρόκειται για ένα δημοκρατικό μοντέλο συμμετοχής στη λήψη αποφάσεων, καθώς κάθε μέλος έχει μία ψήφο, ανεξάρτητα από το συνεταιριστικό κεφάλαιο που διαθέτει, και προσφέρει επίσης στις περιφέρειες του νησιού με συγκεκριμένα κριτήρια. Έτσι, μπορούν να δημιουργηθούν ευνοϊκές συνθήκες για την τοπική και περιφερειακή ανάπτυξη και καινοτομία, καθώς και για την αποκέντρωση της παραγωγής ενέργειας.
On duality and negative dimensions in the theory of Lie groups and symmetric spaces
Creators: name: Mkrtchyan, Ruben L.
name: Veselov, Alexander P.
Publisher: name: arXiv
Year: 2010
Subjects: subject: Mathematical Physics (math-ph)
subject: Representation Theory (math.RT)
subject: FOS: Physical sciences
subject: FOS: Mathematics
subject: 22E46, 53C35

description: We give one more interpretation of the symbolic formulae $U(-N)=U(N)$ and $Sp(-2N)=SO(2N)$ by comparing the values of certain Casimir operators in the corresponding tensor representations. We show also that such relations can be extended to the classical symmetric spaces using Macdonald duality for Jack and Jacobi symmetric functions.
description: 11 pages
Towards superlattices: Lateral bipolar multibarriers in graphene
Creators: name: Drienovsky, Martin
name: Schrettenbrunner, Franz-Xaver
name: Sandner, Andreas
name: Weiss, Dieter
name: Eroms, Jonathan
name: Liu, Ming-Hao
name: Tkatschenko, Fedor
name: Richter, Klaus
Publisher: name: Universität Regensburg
Year: 2014
Subjects: subject: 530 Physik
subject: 73.22.Pr, 73.21.Cd, 73.23.−b

description: We report on transport properties of monolayer graphene with a laterally modulated potential profile, employing striped top gate electrodes with spacings of 100 to 200 nm. Tuning of top and back gate voltages gives rise to local charge carrier density disparities, enabling the investigation of transport properties either in the unipolar (nn′) or the bipolar (np′) regime. In the latter, pronounced single- and multibarrier Fabry-Pérot (FP) resonances occur. We present measurements of different devices with different numbers of top gate stripes and spacings. The data are highly consistent with a phase coherent ballistic tight-binding calculation and quantum capacitance model, whereas a superlattice effect and modification of band structure can be excluded.
Giant enhancement of spin detection sensitivity in (Ga,Mn)As/GaAs Esaki diodes
Creators: name: Shiogai, Junichi
name: Ciorga, Mariusz
name: Utz, Martin
name: Schuh, Dieter
name: Kohda, Makoto
name: Bougeard, Dominique
name: Nojima, Tsutomu
name: Nitta, Junsaku
name: Weiss, Dieter
Publisher: name: Universität Regensburg
Year: 2014
Subjects: subject: 530 Physik
subject: 72.25.Hg, 72.25.Mk, 75.50.Pp

description: We investigate the correlation between spin signals measured in three-terminal (3T) geometry by the Hanle effect and the spin accumulation generated in a semiconductor channel in a lateral (Ga,Mn)As/GaAs Esaki diode device. We systematically compare measurements using a 3T configuration, probing spin accumulation directly beneath the injecting contact, with results from nonlocal measurements, where solely spin accumulation in the GaAs channel is probed. We find that the spin signal detected in the 3T configuration is dominated by a bias-dependent spin detection sensitivity, which in turn is strongly correlated with charge-transport properties of the junction. This results in a particularly strong enhancement of the detected spin signal in a region of increased differential resistance. We find additionally that two-step tunneling via localized states in the gap of (Ga,Mn)As does not compromise spin injection into the semiconductor conduction band.
title: "Statuetta di fanciullo con uccello", arte romana, inv. CXV (ITA/EN)
title: Scheda catalogo digitale Borghese
titleType: AlternativeTitle
Creators: name: Ciccarello, Giulia
name: Galleria Borghese
Publisher: name: Galleria Borghese
Year: 2024

description: Pubblicazione delle schede delle opere conservate nel museo ed estratte dal catalogo digitale di

Galleria Borghese, nelle due versioni esistenti online, in italiano e inglese.

Collegamento al catalogo digitale:

ITA: https://www.collezionegalleriaborghese.it/

EN: https://www.collezionegalleriaborghese.it/en