cometadata/datacite-rtg-text-other-reclassification-records huggingface dataset:
Initial stresses in elastic solids: Constitutive laws and acoustoelasticity
Creators: name: Shams, Moniba
name: Destrade, Michel
name: Ogden, Ray W.
Publisher: name: arXiv
Year: 2013
Subjects: subject: Soft Condensed Matter (cond-mat.soft)
subject: FOS: Physical sciences

description: On the basis of the nonlinear theory of elasticity, the general constitutive equation for an isotropic hyperelastic solid in the presence of initial stress is derived. This derivation involves invariants that couple the deformation with the initial stress and in general, for a compressible material, it requires 10 invariants, reducing to 9 for an incompressible material. Expressions for the Cauchy and nominal stress tensors in a finitely deformed configuration are given along with the elasticity tensor and its specialization to the initially stressed undeformed configuration. The equations governing infinitesimal motions superimposed on a finite deformation are then used to study the combined effects of initial stress and finite deformation on the propagation of homogeneous plane waves in a homogeneously deformed and initially stressed solid of infinite extent. This general framework allows for various different specializations, which make contact with earlier works. In particular, connections with results derived within Biot's classical theory are highlighted. The general results are also specialized to the case of a small initial stress and a small pre-deformation, i.e. to the evaluation of the acoustoelastic effect. Here the formulas derived for the wave speeds cover the case of a second-order elastic solid without initial stress and subject to a uniaxial tension [Hughes and Kelly, Phys. Rev. 92 (1953) 1145] and are consistent with results for an undeformed solid subject to a residual stress [Man and Lu, J. Elasticity 17 (1987) 159]. These formulas provide a basis for acoustic evaluation of the second- and third-order elasticity constants and of the residual stresses. The results are further illustrated in respect of a prototype model of nonlinear elasticity with initial stress, allowing for both finite deformation and nonlinear dependence on the initial stress.
description: 23 pages
Dual host-pathogen small RNA sequencing during wheat stem rust infection
Creators: name: Mueth, Nicholas
name: Hulbert, Scot
Publisher: name: figshare
Year: 2023
Subjects: Plant pathology
Genomics and transcriptomics

description: This is a high throughput small RNA sequencing dataset from bread wheat plants (Triticum aestivum) interacting with the wheat stem rust fungus (Puccinia graminis f.sp. tritici). This repository was set up as part of a submission to the journal BMC Research Notes (see reference below). Here you will find sequencing reads and the results of quality control analyses performed to ensure sample and data integrity. You are free to use these data with proper attribution.
NAUTILOS D8.6 - Model approach implementation and specifications
Creators: name: Martins, Flávio
name: Triantafyllou, George
name: Tsiaras, Kostas
name: Kristiansen, Trond
name: Protsenko, Elizaveta
name: Mendonça, Fernando
Publisher: name: Zenodo
Year: 2021
Subjects: www.nautilos-h2020.eu

description: This deliverable sets the ground base activities developed to support the simulation experiments which will be developed in WP9. The OSSE concept is delineated, the characteristic for the Nature Runs and for the forecasting models are set and the assessment methods are defined.
Advanced high pressure turbine blade repair technologies
Creators: name: Alfred, Irene
name: Nicolaus, Martin
name: Hermsdorf, Jörg
name: Kaierle, Stefan
name: Möhwald, Kai
name: Maier, Hans Jürgen
name: Wesling, Volker
Publisher: name: Amsterdam : Elsevier B.V.
Year: 2018
Subjects: subject: Brazing
subject: Coating
subject: Hybrid joining
subject: Laser cladding
subject: Nickel-based superalloys
subject: Aircraft engines
subject: Aluminum alloys
subject: Chromium alloys
subject: Coatings
subject: Cobalt alloys
subject: Cost effectiveness
subject: Gas turbines
subject: Nickel alloys
subject: Nickel coatings
subject: Repair
subject: Single crystals
subject: Thermal spraying
subject: Turbine components
subject: Yttrium alloys
subject: Aluminizing process
subject: Cladded materials
subject: Extreme conditions
subject: High pressure turbine blade
subject: Monocrystalline structures
subject: Nickel- based superalloys
subject: Single crystal turbine blades
subject: Turbomachine blades
subject: Konferenzschrift
subject: Dewey Decimal Classification::600 | Technik
subject: Dewey Decimal Classification::600 | Technik::670 | Industrielle und handwerkliche Fertigung

description: Components in aircraft engines and gas turbines are exposed to extreme conditions in order to increase performance and efficiency of the overall engine, hence there is an increasing need for cost-effective and time-efficient repair strategies. Presented here are two novel approaches to the repair of Nickel-based components. The hybrid brazing process involves the application of a repair coating, a nickel-based filler material, a NiCoCrAlY and an aluminium layer, by thermal spraying followed by a heat treatment and combined brazing-aluminizing process. This significantly shortens the conventional repair brazing process and yields superior results. Single-crystal additive repair by laser cladding is applied for the repair of small or large defects in single-crystal turbine blades by enabling monocrystalline solidification of the cladded material by use of a temperature gradient, thereby allowing for the regeneration of these expensive components. The novel approach that combines layer-wise addition of material and laser melting enables the formation of highly monocrystalline structures.
Probabilistic Forecasting in Day-Ahead Electricity Markets: Simulating Peak and Off-Peak Prices
Creators: name: Muniain, Peru
name: Ziel, Florian
Publisher: name: arXiv
Year: 2018
Subjects: subject: Econometrics (econ.EM)
subject: FOS: Economics and business

description: In this paper we include dependency structures for electricity price forecasting and forecasting evaluation. We work with off-peak and peak time series from the German-Austrian day-ahead price, hence we analyze bivariate data. We first estimate the mean of the two time series, and then in a second step we estimate the residuals. The mean equation is estimated by OLS and elastic net and the residuals are estimated by maximum likelihood. Our contribution is to include a bivariate jump component on a mean reverting jump diffusion model in the residuals. The models' forecasts are evaluated using four different criteria, including the energy score to measure whether the correlation structure between the time series is properly included or not. In the results it is observed that the models with bivariate jumps provide better results with the energy score, which means that it is important to consider this structure in order to properly forecast correlated time series.
description: 30 pages, 11 figures, 3 tables and Accepted in International Journal of Forecasting
Investigation of target erosion profiles sputter-eroded by a low-energy broad ion beam
Creators: name: Sakiew, Wjatscheslaw
name: Klocke, Eileen
name: Ristau, Detlev
Publisher: name: New York, NY : American Inst. of Physics
Year: 2021
Subjects: subject: Coatings
subject: Erosion
subject: Ion sources
subject: Silica
subject: Sputtering
subject: Coated substrates
subject: Coating technologies
subject: Empirical functions
subject: Ion-beam sputtering
subject: Ion-solid interactions
subject: Macroscopic surfaces
subject: Process geometries
subject: Qualitative distribution
subject: Ion beams
subject: Dewey Decimal Classification::500 | Naturwissenschaften::530 | Physik

description: The demand for ion beam sputtering (IBS) coated substrates is growing. In order to find new fields of application for IBS coating technology, it is necessary to understand in detail the distributions of the involved particles in an industrial-scale reactive coating process. In pursuit of this goal, in the present investigation, profiles sputter-eroded from tantalum, silicon, and silicon dioxide targets by a low-energy broad ion beam (ion energy ≤ 1.9 keV, ion source RIM-20) are measured with a mechanical profilometer and compared. To approximate the discrete and two-dimensional erosion data accurately, an empirical function is developed. For an applied target tilt angle of 55°, the results indicate that the actual angle-dependent ion-solid interaction mechanisms at the atomic level have a rather subordinate role in the macroscopic surface modification of the target in terms of the qualitative distribution of the erosion profile. The applied process geometry seems to have a much larger impact. Furthermore, in the case of silicon, a linear erosion rate as a function of erosion time is observed. Thus, the form of the broad erosion profile does not seem to have a measurable effect on the erosion rate. © 2021 Author(s).
Convolutional Neural Networks for Epileptic Seizure Prediction
Creators: name: Eberlein, Matthias
name: Hildebrand, Raphael
name: Tetzlaff, Ronald
name: Hoffmann, Nico
name: Kuhlmann, Levin
name: Brinkmann, Benjamin
name: Müller, Jens
Publisher: name: arXiv
Year: 2018
Subjects: subject: Machine Learning (cs.LG)
subject: Neurons and Cognition (q-bio.NC)
subject: Machine Learning (stat.ML)
subject: FOS: Computer and information sciences
subject: FOS: Biological sciences

description: Epilepsy is the most common neurological disorder and an accurate forecast of seizures would help to overcome the patient's uncertainty and helplessness. In this contribution, we present and discuss a novel methodology for the classification of intracranial electroencephalography (iEEG) for seizure prediction. Contrary to previous approaches, we categorically refrain from an extraction of hand-crafted features and use a convolutional neural network (CNN) topology instead for both the determination of suitable signal characteristics and the binary classification of preictal and interictal segments. Three different models have been evaluated on public datasets with long-term recordings from four dogs and three patients. Overall, our findings demonstrate the general applicability. In this work we discuss the strengths and limitations of our methodology.
description: accepted for MLESP 2018
Indexed Labels for Loop Iteration Dependent Costs
Creators: name: Tranquilli, Paolo
Publisher: name: arXiv
Year: 2013
Subjects: subject: Programming Languages (cs.PL)
subject: FOS: Computer and information sciences

description: We present an extension to the labelling approach, a technique for lifting resource consumption information from compiled to source code. This approach, which is at the core of the annotating compiler from a large fragment of C to 8051 assembly of the CerCo project, looses preciseness when differences arise as to the cost of the same portion of code, whether due to code transformation such as loop optimisations or advanced architecture features (e.g. cache). We propose to address this weakness by formally indexing cost labels with the iterations of the containing loops they occur in. These indexes can be transformed during the compilation, and when lifted back to source code they produce dependent costs. The proposed changes have been implemented in CerCo's untrusted prototype compiler from a large fragment of C to 8051 assembly.
description: In Proceedings QAPL 2013, arXiv:1306.2413
Spectroscopic observations of the interacting massive binary AQ\,Cassiopea
Creators: name: Ibanoglu, C.
name: Cakirli, O.
name: Sipahi, E.
Publisher: name: arXiv
Year: 2013
Subjects: subject: Solar and Stellar Astrophysics (astro-ph.SR)
subject: FOS: Physical sciences

description: New spectroscopic observations of the double-lined eclipsing binary AQ\,Cas are presented. All available spectroscopic and photometric observations have been analysed for the fundamental properties of the components. Analyses show that the system consists of a massive primary with a mass of 17.63$\pm$0.91 M$_{\odot}$ and radius of 13.48$\pm$0.64R$_{\odot}$ and a secondary with 12.56$\pm$0.81 M$_{\odot}$ and radius of 23.55$\pm$0.73 R$_{\odot}$, corresponding spectral types of B0.5($\pm$2) II-III + B3($\pm$1) II. The secondary star fills its corresponding Roche lobe and mass transfer to the primary star is going on. This stream considerably does affect the photometric observations both starting from the second quarter up to the first contact of primary eclipse and just at the second maximum. Thus, the light curve is distorted and tightly depended on the wavelength of the observations. The available multi passband light curves have been analysed by taking the stream effects, as either hot or cool spots, into account. The comparison of the models and observations in the $\log(L/L_{\odot})$ - $\log T_{eff}$ and $\log g - \log T_{eff}$ diagrams clearly shows that the more massive star is consistent with models and is predicted to be close to the phase of hydrogen shell ignition. Average distance to the system is estimated as 4150$\pm$240 pc using the BVJHK magnitudes and V-passband extinction.
description: 20 pages, 3 figures, Accepted in New AStronomy
RSAED: Robust and Secure Aggregation of Encrypted Data in Wireless Sensor Networks
Creators: name: Boudia, Omar Rafik Merad
name: Feham, Mohamed
Publisher: name: arXiv
Year: 2012
Subjects: subject: Cryptography and Security (cs.CR)
subject: FOS: Computer and information sciences

description: Recently, secure in-network aggregation in wireless sensor networks becomes a challenge issue, there is an extensive research on this area due to the large number of applications where the sensors are deployed and the security needs. In the last few years, aggregation of encrypted data has been proposed in order to maintain secrecy between the sensors and the sink, so the end-to-end data confidentiality is provided. However, the data integrity was not addressed. In this paper, we propose RSAED that allows integrity verification at intermediate nodes, ensures the base station to receive ciphertexts which come only from legitimate nodes and also improves the efficiency. Through implementation results, we evaluate our scheme using computation and communication overhead.
description: 15 pages
Luzula sudetica DC.
Creators: name: Becherer
Publisher: name: Zenodo
Year: 1956
Subjects: Biodiversity
Taxonomy

description: L. sudetica (Willd.) DC. (L. campestris var. sudetica Celak., L. camp. ssp. sudetica Vollmann) Cat. 357. Bis 2540 m. Var. alpina (Hoppe) A. et G. - l: Grammont (J.); Linleux; Pointe de Beccor; Col de Cou; Dent de Valerette; Signal de Bostan (alles: Briquet); La Tendaz (Coquoz); Col de Barberine (Exk. Soc. Murith.); Haut d'Arbignon (Gams); Haut d'Alesse (idem). - 2: Montagne de Fully bis 2500 m (Gams); Grand Chavalard, 2540 m (idem). - 3:Valsorey (Guyot); Gr. St.Bernhard (Beauverd); Val des Dix (Pannatier); Törbel (Stehler); Zermatt (J.); Stellisee ob Zermatt, 2536m (Thellung 1922). - 3a: Silva (Alpien) (Becherer). - 4: Aletschwald (Schröter); Binntal (Binz); Gletsch (Aubert). Subvar. conglobata Buchenau - l: Cornettes de Bise(Briquet); zwischen der Dent de Valerette und der Dent de Valère (idem).
description: Published as part of Becherer, 1956, Florae Vallesiacae Supplementum, pp. 1-556 in Denkschriften der Schweizerischen Naturforschenden Gesellschaft 71 on pages 1-556
Mott-Hubbard transition in V2O3 revisited
Creators: name: Hansmann, P.
name: Toschi, A.
name: Sangiovanni, G.
name: Saha-Dasgupta, T.
name: Lupi, S.
name: Marsi, M.
name: Held, K.
Publisher: name: arXiv
Year: 2013
Subjects: subject: Strongly Correlated Electrons (cond-mat.str-el)
subject: Materials Science (cond-mat.mtrl-sci)
subject: FOS: Physical sciences

description: The isostructural metal-insulator transition in Cr-doped V2O3 is the textbook example of a Mott-Hubbard transition between a paramagnetic metal and a paramagnetic insulator. We review recent theoretical calculations as well as experimental findings which shed new light on this famous transition. In particular, the old paradigm of a doping-pressure equivalence does not hold, and there is a microscale phase separation for Cr-doped V2O3.
description: 16 pages, 11 figures, Feature Article which reviews recent calculations and experiments which shed a new light on the famous Mott-Hubbard transition in V2O3. To appear in physica status solidi (b) 2013
Quasi-periodic oscillations, trapped inertial waves and strong toroidal magnetic fields in relativistic accretion discs
Creators: name: Dewberry, Janosz W.
name: Latter, Henrik N.
name: Ogilvie, Gordon I.
Publisher: name: arXiv
Year: 2018
Subjects: subject: High Energy Astrophysical Phenomena (astro-ph.HE)
subject: FOS: Physical sciences

description: The excitation of trapped inertial waves (r-modes) by warps and eccentricities in the inner regions of a black hole accretion disc may explain the high-frequency quasi-periodic oscillations (HFQPOs) observed in the emission of Galactic X-ray binaries. However, it has been suggested that strong vertical magnetic fields push the oscillations' trapping region toward the innermost stable circular orbit (ISCO), where conditions could be unfavourable for their excitation. This paper explores the effects of large-scale magnetic fields that exhibit \textit{both} toroidal and vertical components, through local and global linear analyses. We find that a strong toroidal magnetic field can reduce the detrimental effects of a vertical field: in fact, the isolation of the trapping region from the ISCO may be restored by toroidal magnetic fields approaching thermal strengths. The toroidal field couples the r-modes to the disc's magneto-acoustic response and inflates the effective pressure within the oscillations. As a consequence, the restoring force associated with the vertical magnetic field's tension is reduced. Given the analytical and numerical evidence that accretion discs threaded by poloidal magnetic field lines develop a strong toroidal component, our result provides further evidence that the detrimental effects of magnetic fields on trapped inertial modes are not as great as previously thought.
description: 16 pages, 6 figures, MNRAS accepted
GMA-laser hybrid welding of high-strength fine-grain structural steel with an inductive preheating
Creators: name: Lahdo, Rabi
name: Seffer, Oliver
name: Springer, André
name: Kaierle, Stefan
name: Overmeyer, Ludger
Publisher: name: Amsterdam : Elsevier B.V.
Year: 2014
Subjects: subject: GMA-laser hybrid welding
subject: High-strength fine-grain structural steel
subject: Inductive preheating
subject: Konferenzschrift
subject: Dewey Decimal Classification::500 | Naturwissenschaften::530 | Physik

description: The industrial use of GMA-laser hybrid welding has increased in the last 10 years, due to the brilliant quality of the laser beam radiation, and higher laser output powers. GMA-laser hybrid welding processes operate in a common molten pool. The combination of the laser beam and the arc results in improved welding speed, penetration depth, heat affected zone and gap bridgeability. Single-layer, GMA-laser hybrid welding processes have been developed for high-strength fine-grain structural steels with a grade of S690QL and a thickness of 15 mm and 20 mm. In addition, the welding process is assisted by an integrated, inductive preheating process to improve the mechanical properties of the welding seam. By using the determined parameters regarding the energy per unit length, and the preheating temperature, welding seams with high quality can be achieved.
Quantitative Security Analysis for Multi-threaded Programs
Creators: name: Ngo, Tri Minh
name: Huisman, Marieke
Publisher: name: arXiv
Year: 2013
Subjects: subject: Cryptography and Security (cs.CR)
subject: FOS: Computer and information sciences

description: Quantitative theories of information flow give us an approach to relax the absolute confidentiality properties that are difficult to satisfy for many practical programs. The classical information-theoretic approaches for sequential programs, where the program is modeled as a communication channel with only input and output, and the measure of leakage is based on the notions of initial uncertainty and remaining uncertainty after observing the final outcomes, are not suitable to multi-threaded programs. Besides, the information-theoretic approaches have been also shown to conflict with each other when comparing programs. Reasoning about the exposed information flow of multi-threaded programs is more complicated, since the outcomes of such programs depend on the scheduler policy, and the leakages in intermediate states also contribute to the overall leakage of the program. This paper proposes a novel model of quantitative analysis for multi-threaded programs that also takes into account the effect of observables in intermediate states along the trace. We define a notion of the leakage of a program trace. Given the fact that the execution of a multi-threaded program is typically described by a set of traces, the leakage of a program under a specific scheduler is computed as the expected value of the leakages of all possible traces. Examples are given to compare our approach with the existing approaches.
description: In Proceedings QAPL 2013, arXiv:1306.2413
Pairwise Compatibility for 2-Simple Minded Collections
Creators: name: Hanson, Eric J.
name: Igusa, Kiyoshi
Publisher: name: arXiv
Year: 2019
Subjects: subject: Representation Theory (math.RT)
subject: FOS: Mathematics
subject: 16G20, 05E15

description: In $τ$-tilting theory, it is often difficult to determine when a set of bricks forms a 2-simple minded collection. The aim of this paper is to determine when a set of bricks is contained in a 2-simple minded collection for a $τ$-tilting finite algebra. We begin by extending the definition of mutation from 2-simple minded collections to more general sets of bricks (which we call semibrick pairs). This gives us an algorithm to check if a semibrick pair is contained in a 2-simple minded collection. We then use this algorithm to show that the 2-simple minded collections of a $τ$-tilting finite gentle algebra (whose quiver contains no loops or 2-cycles) are given by pairwise compatibility conditions if and only if every vertex in the corresponding quiver has degree at most 2. As an application, we show that the classifying space of the $τ$-cluster morphism category of a $τ$-tilting finite gentle algebra (whose quiver contains no loops or 2-cycles) is an Eilenberg- MacLane space if every vertex in the corresponding quiver has degree at most 2.
description: v5: journal version. v4: changed title, updated and added references, changes to exposition for clarity and readability, corrected typos. v3: changes to introduction. v2: Made a correction to Corollary 5.12 (Theorem D in the introduction). 27 pages
Feasibility of Round Window Stimulation by a Novel Electromagnetic Microactuator
Creators: name: Van Drunen, Wouter Johannes
name: Mueller, Mathias
name: Glukhovskoy, Anatoly
name: Salcher, Rolf
name: Wurz, Marc Christopher
name: Lenarz, Thomas
name: Maier, Hannes
Publisher: name: New York, NY : Hindawi Publishing Corporation
Year: 2017
Subjects: subject: cochlea fenestra
subject: feasibility study
subject: human
subject: sound pressure
subject: stapes
subject: temporal bone
subject: Dewey Decimal Classification::600 | Technik::610 | Medizin, Gesundheit

description: Introduction. Most implantable hearing aids currently available were developed to compensate the sensorineural hearing loss by driving middle ear structures (e.g., the ossicles). These devices are successfully used in round window (RW) stimulation clinically, although this was initially not the intended use. Here, a novel microactuator, specifically designed for RW stimulation, was tested in human temporal bones to determine actuator performance and applicability. Methods. Stapes footplate response to RW stimulation was determined experimentally in human temporal bones and the obtained sound pressure output level was estimated. Results. The actuator had a flat displacement response between 0.125 and 4 kHz, a resonance between 4 and 7 kHz, and a roll-off above. At increasing contact force, the stapes footplate displacement decreased by 5-10 dB re μm for forces ≥ 2 mN. The equivalent sound pressure level between 0.125 and 4 kHz amounted to 87-97 eq dB SPL and increased to 117 eq dB SPL for frequencies of 4-7 kHz. The total harmonic distortion (THD) of the actuator ranged within 15-40% for static forces of 5 mN. Conclusion. The feasibility of an electromagnetic actuator that may be placed into the RW niche was demonstrated but requires further optimization in terms of THD and static force sensitivity. © 2017 Wouter Johannes van Drunen et al.
Arrenurus (Megaluracarus) rostratus Daday 1898
Creators: name: Smit, Harry
Publisher: name: Zenodo
Year: 2010
Subjects: Biodiversity
Taxonomy
Animalia
Arthropoda
Arachnida
Trombidiformes
Arrenuridae
Arrenurus
Arrenurus rostratus

description: Arrenurus (Megaluracarus) rostratus Daday, 1898 (Fig. 8)
description: Published as part of Smit, Harry, 2010, Australian Arrenurus (Acari, Hydrachnidia) with the description of eleven new species, pp. 1-26 in Zootaxa 2541 on page 14, DOI: 10.5281/zenodo.196693
Noise at a Fermi-edge singularity in self-assembled InAs quantum dots
Creators: name: Maire, Niels
name: Hohls, Frank
name: Lüdtke, T.
name: Pierz, Klaus
name: Haug, Rolf J.
Publisher: name: College Park, MD : American Physical Society
Year: 2007
Subjects: subject: quantum dots
subject: noise
subject: high magnetic field
subject: Dewey Decimal Classification::500 | Naturwissenschaften::530 | Physik

description: We present noise measurements of self-assembled InAs quantum dots at high magnetic field. In comparison to I-V characteristics at zero magnetic field, we notice a strong current overshoot that is due to a Fermi-edge singularity. We observe an enhanced suppression in the shot noise power simultaneous to the current overshoot that is attributed to the electron-electron interaction at the Fermi-edge singularity. © 2007 The American Physical Society.
Arrenurus (Megaluracarus) rostratus Daday 1898
Creators: name: Smit, Harry
Publisher: name: Zenodo
Year: 2010
Subjects: Biodiversity
Taxonomy
Animalia
Arthropoda
Arachnida
Trombidiformes
Arrenuridae
Arrenurus
Arrenurus rostratus

description: Arrenurus (Megaluracarus) rostratus Daday, 1898
(Fig. 8)
description: Published as part of Smit, Harry, 2010, Australian Arrenurus (Acari, Hydrachnidia) with the description of eleven new species, pp. 1-26 in Zootaxa 2541 on page 14, DOI: 10.5281/zenodo.196693
title: Carl Haller von Hallerstein in Griechenland 1810 - 1817. Architekt · Zeichner · Bauforscher. Ausstellung im Stadtmuseum Fembohaus und Albrecht Dürer Haus Nürnberg · 22. März - 11. Mai 1986
Creators: name: Hebecker, Inge
Publisher: name: University Library Heidelberg
Year: 2015

description: [nicht vorhanden / not available]
Linear magnetoresistance in compensated graphene bilayer
Creators: name: Vasileva, G.Y.
name: Smirnov, D.
name: Ivanov, Y.L.
name: Vasilyev, Y.B.
name: Alekseev, P.S.
name: Dmitriev, A.P.
name: Gornyi, I.V.
name: Kachorovskii, V.Y.
name: Titov, M.
name: Narozhny, B.N.
name: Haug, Rolf J.
Publisher: name: College Park, MD : American Physical Society
Year: 2016
Subjects: subject: Magnetoresistance
subject: bilayer graphene
subject: Dewey Decimal Classification::500 | Naturwissenschaften::530 | Physik

description: We report a nonsaturating linear magnetoresistance in charge-compensated bilayer graphene in a temperature range from 1.5 to 150 K. The observed linear magnetoresistance disappears away from charge neutrality, ruling out the traditional explanation of the effect in terms of the classical random resistor network model. We show that experimental results qualitatively agree with a phenomenological two-fluid model taking into account electron-hole recombination and finite-size sample geometry. © 2016 American Physical Society.
Interaction-induced spin polarization in quantum dots
Creators: name: Rogge, M.C.
name: Räsänen, E.
name: Haug, Rolf J.
Publisher: name: College Park, MD : American Physical Society
Year: 2010
Subjects: subject: Fock-Darwin spectrum
subject: High magnetic fields
subject: Interaction effect
subject: Landau levels
subject: Quantum Dot
subject: Spin-density-functional theory
subject: Density functional theory
subject: Electronic states
subject: Magnetic fields
subject: Semiconductor quantum dots
subject: Spin polarization
subject: Spin dynamics
subject: Dewey Decimal Classification::500 | Naturwissenschaften::530 | Physik

description: The electronic states of lateral many-electron quantum dots in high magnetic fields are analyzed in terms of energy and spin. In a regime with two Landau levels in the dot, several Coulomb-blockade peaks are measured. A zigzag pattern is found as it is known from the Fock-Darwin spectrum. However, only data from Landau level 0 show the typical spin-induced bimodality, whereas features from Landau level 1 cannot be explained with the Fock-Darwin picture. Instead, by including the interaction effects within spin-density-functional theory a good agreement between experiment and theory is obtained. The absence of bimodality on Landau level 1 is found to be due to strong spin polarization. © 2010 The American Physical Society.
Quantum digital cooling
Creators: name: Polla, Stefano
name: Herasymenko, Yaroslav
name: O'Brien, Thomas E.
Publisher: name: arXiv
Year: 2019
Subjects: subject: Quantum Physics (quant-ph)
subject: FOS: Physical sciences

description: We introduce a method for digital preparation of ground states of simulated Hamiltonians, inspired by cooling in nature and adapted to leverage the capabilities of digital quantum hardware. The cold bath is simulated by a single ancillary qubit, which is reset periodically and coupled to the system non-perturbatively. Studying this cooling method on a 1-qubit system toy model, we optimize two cooling protocols based on weak-coupling and strong-coupling approaches. Extending the insight from the 1-qubit system model, we develop two scalable protocols for larger systems. The LogSweep protocol extends the weak-coupling approach by sweeping energies to resonantly match any targeted transition. We test LogSweep on the 1D tranverse-field Ising model, demonstrating approximate ground state preparation with an error that can be made polynomially small in the computation time for all three phases of the system. The BangBang protocol extends the strong-coupling approach, and exploits a heuristics for local Hamiltonians to maximise the probability of de-exciting system transitions in the shortest possible time. Although this protocol does not promise long-time convergence, it allows for a rapid cooling to an approximation of the ground state, making this protocol appealing for near-term demonstrations.
description: 10 + 4 pages, 10 + 1 figures
PT phase transition in higher-dimensional quantum systems
Creators: name: Mandal, Bhabani Prasad
name: Mourya, Brijesh Kumar
name: Yadav, Rajesh Kumar
Publisher: name: arXiv
Year: 2013
Subjects: subject: Quantum Physics (quant-ph)
subject: High Energy Physics - Theory (hep-th)
subject: Mathematical Physics (math-ph)
subject: FOS: Physical sciences

description: We consider a 2d anisotropic SHO with {\bf ixy} interaction and a 3d SHO in an imaginary magnetic field with $\vecμ_l$.$\vec B$ interaction to study the $PT$ phase transition analytically in higher dimension.Unbroken $PT$ symmetry in the first case is complementary to the rotational symmetry of the original Hermitian system .$PT$ phase transition ceases to occur the moment the 2d oscillator becomes isotropic.Transverse magnetic field in the other system introduces the anisotropy in the system and the system undergoes PT phase transition depending on the strength of the magnetic field and frequency of the oscillator.
description: 10 pages, Latex, No figs
Influence of the laser and its scan width in the LDNA surfacing process
Creators: name: Barroi, A.
name: Amelia, J.
name: Hermsdorf, J.
name: Kaierle, S.
name: Wesling, V.
Publisher: name: Amsterdam : Elsevier B.V.
Year: 2014
Subjects: subject: Cladding
subject: Electric arc
subject: Laser
subject: Process combination
subject: Surfacing
subject: Konferenzschrift
subject: Dewey Decimal Classification::500 | Naturwissenschaften::530 | Physik

description: The novel laser-assisted double-wire non-transferred arc (LDNA) surfacing process that melts two consumable wires with an arc between them and uses a laser to guide the process has shown very promising results. Investigations show that it is possible to create single seams with a complete bond and low dilution at a deposition rate of 7.5 kg/h. In case of multiple seams, joint defects might be formed between the seams due to unfavourable seam geometry. In this paper, results on the optimization of this geometry with an adapted laser scan width are presented. An average connection angle of 93 degrees has been achieved on the side of the weld, where additional seams are placed. It is expected that with these results multiple seams can be welded without producing joint defects, thus leading to an intact layer.
Spectroscopic characterization of graphene films grown on Pt (111) surface by chemical vapor deposition of ethylene
Creators: name: Cazzanelli, E.
name: Caruso, T.
name: Castriota, M.
name: Marino, A. R.
name: Politano, A.
name: Chiarello, G.
name: Giarola, M.
name: Mariotto, G.
Publisher: name: arXiv
Year: 2013
Subjects: subject: Mesoscale and Nanoscale Physics (cond-mat.mes-hall)
subject: Materials Science (cond-mat.mtrl-sci)
subject: FOS: Physical sciences

description: This work reports the peculiar properties of a graphene film prepared by the chemical vapor deposition (CVD) of ethylene in high vacuum on a well oriented and carefully cleaned Pt(111) crystal surface maintained at high temperature. In-situ and ex-situ characterization techniques (low energy electron diffraction, high resolution electron energy loss spectroscopy, scanning electron microscopy and Raman micro-spectroscopy) used here indicate the prevalence of single layer regions and the presence of two different orientations of the graphene sheets with respect to the Pt(111) substrate. In most of the deposited area evidence is found of a compressive stress for the graphene lattice, as a net result of the growth process on a metal substrate. This graphene film grown on Pt(111) exhibits a lower degree of order and of homogeneity with respect to the exfoliated graphene on Si/SiO2, as it is found generally for graphene on metals, but several characterization techniques indicates a better quality than in previous deposition experiments on the same metal substrate.
description: 18 pages, 5 figures, Journal of Raman spectroscopy 2013
Influence of welding current and focal position on the resonant absorption of laser radiation in a TIG welding arc
Creators: name: Emde, B.
name: Huse, M.
name: Hermsdorf, J.
name: Kaierle, S.
name: Wesling, V.
name: Overmeyer, L.
Publisher: name: Amsterdam : Elsevier B.V.
Year: 2014
Subjects: subject: Laser radiation
subject: Resonant absorption
subject: TIG arc
subject: Konferenzschrift
subject: Dewey Decimal Classification::500 | Naturwissenschaften::530 | Physik

description: The work presents the influence of welding current and focal position on the resonant absorption of diode laser radiation in a TIG welding arc. The laser beam is guided perpendicular to the electrical arc to avoid an interaction with the electrodes. Laser power measurements have shown a reduction of the measured laser power up to 18 % after passing the electrical arc. This reduction results from the interaction of argon shielding gas atoms and laser radiation at 810.4 nm and 811.5 nm. The interaction is strongly affected by the adjusted welding current and the adjustment of the laser beam and the electrical arc. Lowering the welding current or shifting the laser beam out of the centerline of the electrical arc reduces the ionization probability. An increased ionization is necessary to decrease the resistance of the electrical arc.
Molecular dynamics modeling of self-diffusion along a triple junction
Creators: name: Frolov, Timofey
name: Mishin, Yuri
Publisher: name: arXiv
Year: 2013
Subjects: subject: Materials Science (cond-mat.mtrl-sci)
subject: FOS: Physical sciences

description: We propose a computational procedure for creating a stable equilibrium triple junction (TJ) with controlled grain misorientations. We apply this procedure to construct a TJ between a Σ5(210) grain boundary (GB) and two general high-angle GBs in copper, and calculate the diffusion coefficients along the TJ and the GBs using molecular dynamics with an embedded-atom potential. The TJ diffusion is only a factor of two faster than diffusion in the Σ5 GB but significantly faster than diffusion in the general GBs. Both the GBs and the TJ studied here show a premelting behavior near the bulk melting point, where their diffusivities converge to the diffusivity of bulk liquid. Although our results are consistent with the common assumption that TJ diffusion is generally faster than GB diffusion, the difference between the two diffusivities does not appear to be large enough to ensure a significant contribution of TJs to diffusional creep in polycrystals at high temperatures.
description: 14 pages, 5 figures
Enhancing Unsatisfiable Cores for LTL with Information on Temporal Relevance
Creators: name: Schuppan, Viktor
Publisher: name: arXiv
Year: 2013
Subjects: subject: Logic in Computer Science (cs.LO)
subject: Software Engineering (cs.SE)
subject: FOS: Computer and information sciences
subject: F.4.1; F.3.1; D.2.4; B5.2; I.2.4

description: LTL is frequently used to express specifications in many domains such as embedded systems or business processes. Witnesses can help to understand why an LTL specification is satisfiable, and a number of approaches exist to make understanding a witness easier. In the case of unsatisfiable specifications unsatisfiable cores (UCs), i.e., parts of an unsatisfiable formula that are themselves unsatisfiable, are a well established means for debugging. However, little work has been done to help understanding a UC of an unsatisfiable LTL formula. In this paper we suggest to enhance a UC of an unsatisfiable LTL formula with additional information about the time points at which the subformulas of the UC are relevant for unsatisfiability. For example, in "(G p) and (X not p)" the first occurrence of "p" is really only "relevant" for unsatisfiability at time point 1 (time starts at time point 0). We present a method to extract such information from the resolution graph of a temporal resolution proof of unsatisfiability of an LTL formula. We implement our method in TRP++, and we experimentally evaluate it. Source code of our tool is available.
description: In Proceedings QAPL 2013, arXiv:1306.2413
title: Топонимическое пространство мокша-мордовского села Бахилово на Самарской Луке
Creators: name: Беленов, Николай
Publisher: name: Новгородский печатный двор
Year: 2019

description: В статье анализируется топонимическая номенклатура окрестностей села Бахилово на Самарской Луке. Данное село принадлежит самобытной группе мордовского этноса – самаролукской мордве, время и исторические обстоятельства появления которой на данной территории остаются предметом дискуссий. Анализ проводится с учётом характерных особенностей бахиловского говора мокша-мордовского языка, которые значительно отличают его как от известных мокша-мордовских диалектов, так и от соседних мокша-мордовских говоров, бытующих на Самарской Луке в рамках самаролукского диалекта мокша-мордовского языка: торновского и шелехметского. Работа выполнена на основании полевых материалов автора.
Genus Two Quasi-Siegel Modular Forms and Gromov-Witten Theory of Toric Calabi-Yau Threefolds
Creators: name: Ruan, Yongbin
name: Zhang, Yingchun
name: Zhou, Jie
Publisher: name: arXiv
Year: 2019
Subjects: subject: Algebraic Geometry (math.AG)
subject: Mathematical Physics (math-ph)
subject: Number Theory (math.NT)
subject: FOS: Mathematics
subject: FOS: Physical sciences
subject: 14N35, 11Fxx

description: We first develop theories of differential rings of quasi-Siegel modular and quasi-Siegel Jacobi forms for genus two. Then we apply them to the Eynard-Orantin topological recursion of certain local Calabi-Yau threefolds equipped with branes, whose mirror curves are genus two hyperelliptic curves. By the proof of the Remodeling Conjecture, we prove that the corresponding open- and closed- Gromov-Witten potentials are essentially quasi-Siegel Jacobi and quasi-Siegel modular forms for genus two, respectively.
description: minor revision. A shortened version to appear in Commun. Math. Phys
Temperature distribution during laser based heat conduction welding of CFRP
Creators: name: Wippo, V.
name: Winter, Y.
name: Jaeschke, P.
name: Suttmann, O.
name: Kaierle, Stefan
name: Overmeyer, Ludger
Publisher: name: Amsterdam : Elsevier B.V.
Year: 2018
Subjects: subject: Carbon fiber
subject: Contour welding
subject: Heat conduction welding
subject: Process temperture
subject: Seam strength
subject: Thermoplastic
subject: Carbon fibers
subject: Joining
subject: Laser beam welding
subject: Reinforced plastics
subject: Temperature distribution
subject: Thermoplastics
subject: Carbon fiber reinforced
subject: Complex structure
subject: Conduction welding
subject: Focal points
subject: Laser transmission welding
subject: Laser-based
subject: Process temperature
subject: Heat conduction
subject: Konferenzschrift
subject: Dewey Decimal Classification::600 | Technik
subject: Dewey Decimal Classification::600 | Technik::670 | Industrielle und handwerkliche Fertigung

description: For the implementation of carbon fiber reinforced (CFRP) parts, these need to be assembled to more complex structures. Therefore, laser transmission welding was transferred to heat conduction welding for joining thermoplastic CFRP to itself. The goal of these investigations was to determine the influence of the focal point geometry and the main fiber orientation within the CFRP on the temperature distribution at the upper joining member. A set-up was chosen consisting of two thermo cameras in order to measure the process temperatures on top and underneath the upper joining member. Furthermore, the heat affected width was determined and correlated to the process temperatures.
Star-forming regions of the Aquila rift cloud complex. I. NH3 tracers of dense molecular cores
Creators: name: Levshakov, S. A.
name: Henkel, C.
name: Reimers, D.
name: Wang, M.
name: Mao, R.
name: Wang, H.
name: Xu, Y.
Publisher: name: arXiv
Year: 2013
Subjects: subject: Astrophysics of Galaxies (astro-ph.GA)
subject: FOS: Physical sciences

description: (Abridged) Aims. In the present part of our survey we search for ammonia emitters in the Aquila rift complex which trace the densest regions of molecular clouds. Methods. From a CO survey carried out with the Delingha 14-m telescope we selected ~150 targets for observations in other molecular lines. Here we describe the mapping observations in the NH3(1,1) and (2,2) inversion lines of the first 49 sources performed with the Effelsberg 100-m telescope. Results. The NH3(1,1) and (2,2) emission lines are detected in 12 and 7 sources, respectively. Among the newly discovered NH3 sources, our sample includes the following well-known clouds: the starless core L694-2, the Serpens cloud Cluster B, the Serpens dark cloud L572, the filamentary dark cloud L673, the isolated protostellar source B335, and the complex star-forming region Serpens South. Angular sizes between 40" and 80" (~0.04-0.08 pc) are observed for compact starless cores but as large as 9' (~0.5 pc) for filamentary dark clouds. The measured kinetic temperatures of the clouds lie between 9K and 18K. From NH3 excitation temperatures of 3-8K we determine H2 densities with typical values of ~(0.4-4) 10^4 cm^-3. The masses of the mapped cores range between ~0.05 and ~0.5M_solar. The relative ammonia abundance, X= [NH3]/[H2], varies from 10^-7 to 5 10^-7 with the mean = (2.7+/-0.6) 10^-7 (estimated from spatially resolved cores assuming the filling factor eta = 1). In two clouds, we observe kinematically split NH3 profiles separated by ~1 km/s. The splitting is most likely due to bipolar molecular outflows for one of which we determine an acceleration of
description: 28 pages, 22 figures, 6 tables, accepted for publication in A&A
title: Стратификация дославянской топонимии на Волжско-Двинско-Днепровском водоразделе
Creators: name: Васильев, Валерий
name: Вихрова, Нина
Publisher: name: Новгородский печатный двор
Year: 2019

description: В статье освещена географическая и культурно-историческая специфика водораздела Волги, Западной Двины и Днепра, кратко охарактеризованы главные слои дославянской топонимии (прибалтийско-финского, балтийского и древнеевропейского происхождения) в этом микрорегионе. Приведены этимологические трактовки некоторых древних названий.
Additive manufacturing of glass: CO2-Laser glass deposition printing
Creators: name: Von Witzendorff, Philipp
name: Pohl, Leonhard
name: Suttmann, Oliver
name: Heinrich, Peter
name: Heinrich, Achim
name: Zander, Jörg
name: Bragard, Holger
name: Kaierle, Stefan
Publisher: name: Amsterdam : Elsevier B.V.
Year: 2018
Subjects: subject: Additive manufacturing
subject: Glass
subject: Laser
subject: Carbon dioxide
subject: Carbon dioxide lasers
subject: Deposition
subject: Glass fibers
subject: Lasers
subject: Melting
subject: Quartz
subject: Substrates
subject: Experimental investigations
subject: Fiber-based materials
subject: Glass materials
subject: Glass substrates
subject: Glass-manufacturing
subject: Industrial sector
subject: Laser sources
subject: Three-axis systems
subject: 3D printers
subject: Konferenzschrift
subject: Dewey Decimal Classification::600 | Technik
subject: Dewey Decimal Classification::600 | Technik::670 | Industrielle und handwerkliche Fertigung

description: Additive manufacturing is used in several industrial sectors where polymers and metals are established materials. Different academic studies prove that additive manufacturing methods can be applied on glass materials using powder or fiber based material sources. In terms of quartz glass, with melting temperatures around 2200°C, laser sources are used to achieve the necessary intensities. In the present study, additive manufacturing of quartz glass is achieved by melting a quartz glass fiber with a CO2 laser source. A combined laser head focusses the laser radiation onto the glass fiber in order to melt the fiber. A three axis system is used to move the printing stage and glass substrate. The experimental investigations show that CO2-laser glass deposition printing allows for the creation of arbitrary 3D quartz glass structures. This method is envisioned to replace conventional manual glass manufacturing processes for production of complex hollow glass structures which are present in the medical sector.
Killed Markov Decision Processes on Finite Time Interval for Countable Models
Creators: name: Parolya, Nestor
name: Yeleyko, Yaroslav
Publisher: name: arXiv
Year: 2013
Subjects: subject: Optimization and Control (math.OC)
subject: Probability (math.PR)
subject: FOS: Mathematics
subject: 90C40

description: We consider killed Markov decision processes for countable models on a finite time-interval. Existence of a uniform $\varepsilon$-optimal policy is proven. We show the correctness of the fundamental equation. The optimal control problem is reduced to a similar problem for the derived model. We receive an optimality equation and a method for the construction of simple optimal policies. The sufficiency of simple policies for countable models is proven. We show the correctness of the Markovian property. Additionally, a dynamic programming principle is considered.
description: Revised and corrected version
title: Kunst am Krug. Zur Ausstellung "Keramik in der Weimarer Republik 1919 – 1933. Die Sammlung Tilmann Suddensieg im Germanischen Nationalmuseum". 24. Januar – 29. März 1987
Creators: name: Schneider, Ulrich
Publisher: name: University Library Heidelberg
Year: 2015

description: [nicht vorhanden / not available]