cometadata/datacite-rtg-text-other-reclassification-records huggingface dataset:
Modeling a thermomechanical NC-simulation
Creators: name: Denkena, Berend
name: Schmidt, A.
name: Henjes, J.
name: Niederwestberg, D.
name: Niebuhr, C.
Publisher: name: Amsterdam : Elsevier
Year: 2013
Subjects: subject: Shape errors
subject: Thermomechanical effects
subject: Inverse projections
subject: NC-simulation
subject: Process simulations
subject: Process temperature
subject: Realistic simulation
subject: Thermo-mechanical effects
subject: Workpiece deformation
subject: Heat flux
subject: Machining centers
subject: Tools
subject: Virtual reality
subject: Deformation
subject: Konferenzschrift
subject: Dewey Decimal Classification::600 | Technik
subject: Dewey Decimal Classification::600 | Technik::620 | Ingenieurwissenschaften und Maschinenbau

description: This paper presents a method for a NC-Simulation based prediction of shape errors caused by thermal expansions in machining of complex workpieces. In the first part of the paper the basic approach of modeling a thermomechanical NC-Simulation for a faster and more precise process simulation is shown. Therefore, a fast dexel based material removal simulation including process models for calculation of localized heat flux and forces is linked to a FE model for simulation of thermal conduction in the workpiece. Interdependencies of thermal process and workpiece conditions are considered by a closed simulation loop. In the second part of the paper the modeling of each component is explained. To consider thermomechanical effects in material removal simulation the dexel based workpiece model is extended by additional information like temperature and deformation in every dexel. An inverse projection of the workpiece deformation on a triangulated tool model allows consideration this effect by deformation of the tool model. Thereby, a realistic shape of the workpiece can be simulated. In addition, the current cutting conditions like area of undeformed chip-thickness or contact length are changed. This results in diversified cutting forces and heat fluxes. For a realistic simulation of the thermal conduction the dimensions of the FE model have to be adapted by a time dependent virtual domain method. In the last part of the paper, results of the simulation are compared to measured data. The comparison shows that process temperatures in different workpiece areas are predicted accurately.
High angular resolution observations towards OMC-2 FIR 4: Dissecting an intermediate-mass protocluster
Creators: name: López-Sepulcre, A.
name: Taquet, V.
name: Sánchez-Monge, Á.
name: Ceccarelli, C.
name: Dominik, C.
name: Kama, M.
name: Caux, E.
name: Fontani, F.
name: Fuente, A.
name: Ho, P. T. P.
name: Neri, R.
name: Shimajiri, Y.
Publisher: name: arXiv
Year: 2013
Subjects: subject: Astrophysics of Galaxies (astro-ph.GA)
subject: FOS: Physical sciences

description: OMC-2 FIR 4 is one of the closest known young intermediate-mass protoclusters, located at a distance of 420 pc in Orion. This region is one of the few where the complete 500-2000 GHz spectrum has been observed with the heterodyne spectrometer HIFI on board the Herschel satellite, and unbiased spectral surveys at 0.8, 1, 2 and 3 mm have been obtained with the JCMT and IRAM 30-m telescopes. In order to investigate the morphology of this region, we used the IRAM Plateau de Bure Interferometer to image OMC-2 FIR 4 in the 2-mm continuum emission, as well as in DCO+(2-1), DCN(2-1), C34S(3-2), and several CH3OH lines. In addition, we analysed observations of the NH3(1,1) and (2,2) inversion transitions made with the Very Large Array of the NRAO. The resulting maps have an angular resolution which allows us to resolve structures of 5", equivalent to 2000 AU. Our observations reveal three spatially resolved sources within OMC-2 FIR 4, of one or several solar masses each, with hints of further unresolved substructure within them. Two of these sources have elongated shapes and are associated with dust continuum emission peaks, thus likely containing at least one molecular core each. One of them also displays radio continuum emission, which may be attributed to a young B3-B4 star that dominates the overall luminosity output of the region. The third source identified displays a DCO+(2-1) emission peak, and weak dust continuum emission. Its higher abundance of DCO+ relative to the other two regions suggests a lower temperature and therefore its possible association with either a younger low-mass protostar or a starless core. It may alternatively be part of the colder envelope of OMC-2 FIR 4. Our interferometric observations evidence the complexity of this region, where multiple cores, chemical differentiation and an ionised region all coexist within an area of only 10000 AU.
description: 13 pages, 11 figures, accepted by Astronomy and Astrophysics
Sieversia montana
Creators: name: Becherer
Publisher: name: Zenodo
Year: 1956
Subjects: Biodiversity
Taxonomy

description: 0. montana (L.) DC. (A. montanus L.) Cat. 74 und 424. In der var. Jacquüu (Bunge) Beck. 3: Ferret (Melly); Fionnay (Miller); Bonatchesse (idem); Pierre ä Voir (Besse); Col deTorrent (Beauverd). - 3a: Bistinen (Beauverd).
description: Published as part of Becherer, 1956, Florae Vallesiacae Supplementum, pp. 1-556 in Denkschriften der Schweizerischen Naturforschenden Gesellschaft 71 on pages 1-556
Thermodynamics of continua: the challenge of universality
Creators: name: Ván, P.
Publisher: name: arXiv
Year: 2013
Subjects: subject: Classical Physics (physics.class-ph)
subject: FOS: Physical sciences

description: The explanation of the apparent universality of thermodynamics points toward the extension of the usual conceptual background of the second law. Arguments are collected that a basic guiding idea of stability of thermodynamic equilibrium combined with a proper interpretation of the entropy principle may provide the necessary solid foundation with verifiable consequences.
description: JETC'13 conference paper, 6 pages, 1 figure
Iterated $S^3$ Sasaki Joins and Bott Orbifolds
Creators: name: Boyer, Charles P
name: Tønnesen-Friedman, Christina
Publisher: name: arXiv
Year: 2020
Subjects: subject: Differential Geometry (math.DG)
subject: FOS: Mathematics

description: We present a categorical relationship between iterated $S^3$ Sasaki-joins and Bott orbifolds. Then we show how to construct smooth Sasaki-Einstein (SE) structures on the iterated joins. These become increasingly complicated as dimension grows. We give an explicit construction of (infinitely many) smooth SE structures up through dimension eleven, and conjecture the existence of smooth SE structures in all odd dimensions.
description: 19 pages, Paper submitted to the upcoming conference {\it AMAZER: Analysis of Monge-Amp\`ere, a tribute to Ahmed Zeriahi} at the Institute of Mathematics of Toulouse (June 2021
Analysing the structure of the bulge with Mira variables
Creators: name: Chrobáková, Ž.
name: López-Corredoira, M.
name: Garzón, F.
Publisher: name: arXiv
Year: 2022
Subjects: subject: Astrophysics of Galaxies (astro-ph.GA)
subject: FOS: Physical sciences

description: The Galactic bulge at latitude $4<|b|$(deg.)$<10$ was claimed to show an X-shape, which means that stellar density distributions along the line of sight have a double peak. However, this double peak is only observed with the red-clump population, and doubt has been cast on its use as a perfect standard candle.\ As such, a boxy bulge without an X-shape is not discarded. We aim to constrain the shape of the bulge making use of a different population: Mira variables from the new Optical Gravitational Lensing Experiment data release, OGLE-IV, with an average age of 9 Gyr. We analysed an area of the bulge far from the plane, where we fitted the density of the Miras with boxy bulge and X-shaped bulge models and calculated the probability of each model. We find that the probability of a boxy bulge fitting the data is $p=0.19$, whereas the probability for the X-shaped bulge is only $p=2.85 \cdot 10^{-6}$ (equivalent to a tension of the model with the data of a 4.7$σ$ level). Therefore, the boxy bulge model seems to be more appropriate for describing the Galactic bulge, although we cannot exclude any model with complete certainty.
description: 5 pages, 3 figures, accepted for publication in A&A Letters
Large-scale investigation of wave dampening characteristics of organic, artificial floating islands
Creators: name: Landmann, Jannis
name: Hammer, Tim C.
name: Günther, Henning
name: Hildebrandt, Arndt
Publisher: name: Amsterdam [u.a.] : Elsevier Science
Year: 2022
Subjects: subject: Artificial floating islands
subject: Large scale experiment
subject: Reflection coefficient
subject: Transmission coefficient
subject: Wave dampening
subject: Dewey Decimal Classification::600 | Technik::690 | Hausbau, Bauhandwerk

description: The concept of floating vegetation-based islands for the bioremediation of aquatic ecosystems is well known. Less so, their hydrodynamic capabilities regarding the damping performance, positional stability and water-structure interactions. To this end, physical model tests with fully organic, reed-based gabions were carried out in a large-scale facility in this study. The initial, reflected, and transmitted waves were recorded and analyzed regarding transmission and reflection coefficients. A motion tracking system was utilized to allow for an investigation regarding the motion of the artificial floating islands under waves. The results show that the artificial floating islands significantly dampen shorter waves with a wave period of T ≤ 2.25 s. The transmission of the incident waves is reduced by 50% for the smallest wave periods (T = 1.5 s). The incident waves are reflected between 20 and 50% for the same wave period. The incident wave energy is dissipated by up to 85% for the smallest wave height and period (H = 0.10 m, T = 1.5 s). The comparable performance regarding more traditional floating breakwaters is discussed as well as the width of the structure as the key parameter for the layout of artificial floating islands in rivers and still waters regarding the damping performance. © 2022 The Authors
Probing the microscopic structure and flexibility of oxidized DNA by molecular simulations
Creators: name: Chhetri, Khadka B.
name: Naskar, Supriyo
name: Maiti, Prabal K.
Publisher: name: arXiv
Year: 2022
Subjects: subject: Biological Physics (physics.bio-ph)
subject: Soft Condensed Matter (cond-mat.soft)
subject: FOS: Physical sciences

description: The oxidative damage of DNA is a compelling issue in molecular biophysics as it plays a vital role in the epigenetic control of gene expression and is believed to be associated with mutagenesis, carcinogenesis, and ageing. To understand the microscopic structural changes in physical properties of DNA and the resulting influence on its function due to oxidative damage of its nucleotide bases, we have conducted all-atom molecular dynamic simulations of double-stranded DNA (dsDNA) with its guanine bases being oxidized. The guanine bases are more prone to oxidative damage due to the lowest value of redox potential among all nucleobases. We have analyzed the local as well as global mechanical properties of native and oxidized dsDNA and explained those results by microscopic structural parameters and thermodynamic calculations. Our results show that the oxidative damage of dsDNA does not deform the Watson-Crick geometry; instead, the oxidized DNA structures are found to be better stabilized through electrostatic interactions. Moreover, oxidative damage changes the mechanical, helical, and groove parameters of dsDNA. The persistence length, stretch modulus, and torsional stiffness are found to be 48.87 nm, 1239.26 pN, and 477.30 pN.nm^2, respectively, for native dsDNA, and these values are 61.31 nm, 659.91 pN, and 407.79 pN.nm^2, respectively, when all the guanine bases of the dsDNA are oxidized. Compared to the global mechanical properties, the changes in helical and groove properties are found to be more prominent, concentrated locally at the oxidation sites, and causing the transition of the backbone conformations from BI to BII at the regions of oxidative damage.
Dimer Mott Insulator in an Oxide Heterostructure
Creators: name: Chen, Ru
name: Lee, SungBin
name: Balents, Leon
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: We study the problem of designing an artificial Mott insulator in a correlated oxide heterostructure. We consider the extreme limit of quantum confinement based on ionic discontinuity doping, and argue that a unique dimer Mott insulator can be achieved for the case of a single SrO layer in a GdTiO$_3$ matrix. In the dimer Mott insulator, electrons are localized not to individual atoms but to bonding orbitals on molecular dimers formed across a bilayer of two TiO$_2$ planes, and is analogous to the Mott insulating state of Hubbard ladders, studied in the 1990s. We verify the existence of the dimer Mott insulator through both ab initio and model Hamiltonian studies, and find for reasonable values of Hubbard $U$ that it is stable and ferromagnetic with a clear bonding/anti-bonding splitting of order 0.65eV, and a significant smaller Mott gap whose size depends upon $U$. The combined effects of polar discontinuity, strong structural relaxation and electron correlations all contribute to the realization of this unique ground state.
description: 5 pages, 4 figures
Continuous modelling of machine tool failure durations for improved production scheduling
Creators: name: Denkena, Berend
name: Dittrich, M.-A.
name: Keunecke, L.
name: Wilmsmeier, S.
Publisher: name: Heidelberg : Springer
Year: 2020
Subjects: subject: Failure duration
subject: Manufacturing system
subject: Production planning
subject: Scheduling
subject: Data mining
subject: Manufacture
subject: Production control
subject: Continuous modelling
subject: Cross industry
subject: Embedded models
subject: Failure classification
subject: High potential
subject: Multiple distribution
subject: Production Planning
subject: Production Scheduling
subject: Machine tools
subject: Dewey Decimal Classification::600 | Technik::620 | Ingenieurwissenschaften und Maschinenbau

description: Unforeseen machine tool failures due to technical issues can cause downtimes leading to delays during production. To reduce delays, rescheduling of the production is, in most cases, necessary. However, warranting such a change requires reliable knowledge about the duration of the failure. This article presents a method to provide this knowledge by estimating the duration of a machine tool failure based on previous failure durations. Using the cross-industry standard process for data mining (CRISP-DM) and statistical methods, the embedded model for failure classification and duration is continuously improved. The method is thoroughly tested using multiple distributions, parameters and a practical use case. The results show high potential for predicting the duration of machine tool failures, which consequently could lead to improved quality of rescheduling. © 2020, The Author(s).
High-speed Gaussian modulated continuous-variable quantum key distribution with a local local oscillator based on pilot-tone-assisted phase compensation
Creators: name: Wang, Heng
name: Pi, Yaodi
name: Huang, Wei
name: Li, Yang
name: Shao, Yun
name: Yang, Jie
name: Liu, Jinlu
name: Zhang, Chenlin
name: Zhang, Yichen
name: Xu, Bingjie
Publisher: name: arXiv
Year: 2020
Subjects: subject: Quantum Physics (quant-ph)
subject: FOS: Physical sciences

description: A high-speed Gaussian modulated continuous-variable quantum key distribution (CVQKD) with a local local oscillator (LLO) is experimentally demonstrated based on pilot-tone-assisted phase compensation. In the proposed scheme, the frequency-multiplexing and polarization-multiplexing techniques are used for the separate transmission and heterodyne detection between quantum signal and pilot tone, guaranteeing no crosstalk from strong pilot tone to weak quantum signal and different detection requirements of low-noise for quantum signal and high-saturation limitation for pilot tone. Moreover, compared with the conventional CVQKD based on homodyne detection, the proposed LLO-CVQKD scheme can measure X and P quadrature simultaneously using heterodyne detection without need of extra random basis selection. Besides, the phase noise, which contains the fast-drift phase noise due to the relative phase of two independent lasers and the slow-drift phase noise introduced by quantum channel disturbance, has been compensated experimentally in real time, so that a low level of excess noise with a 25km optical fiber channel is obtained for the achievable secure key rate of 7.04 Mbps in the asymptotic regime and 1.85 Mbps under the finite-size block of 10^7.
Naive motivic Donaldson-Thomas type Hirzebruch classes and some problems
Creators: name: Bussi, Vittoria
name: Yokura, Shoji
Publisher: name: arXiv
Year: 2013
Subjects: subject: Algebraic Geometry (math.AG)
subject: Algebraic Topology (math.AT)
subject: FOS: Mathematics

description: Donaldson-Thomas invariant is expressed as the weighted Euler characteristic of the so-called Behrend (constructible) function. In \cite{Behrend} Behrend introduced a DT-type invariant for a morphism. Motivated by this invariant, we extend the motivic Hirzebruch class to naive Donaldson-Thomas type analogues. We also discuss a categorification of the DT-type invariant for a morphism from a bivariant-theoretic viewpoint, and we finally pose some related questions for further investigations.
Super-Eddington accreting massive black holes as long-lived cosmological standards
Creators: name: Wang, J. -M.
name: Du, P.
name: Valls-Gabaud, D.
name: Hu, C.
name: Netzer, H.
Publisher: name: arXiv
Year: 2013
Subjects: subject: Cosmology and Nongalactic Astrophysics (astro-ph.CO)
subject: Astrophysics of Galaxies (astro-ph.GA)
subject: High Energy Astrophysical Phenomena (astro-ph.HE)
subject: General Relativity and Quantum Cosmology (gr-qc)
subject: FOS: Physical sciences

description: Super-Eddington accreting massive black holes (SEAMBHs) reach saturated luminosities above a certain accretion rate due to photon trapping and advection in slim accretion disks. We show that these SEAMBHs could provide a new tool for estimating cosmological distances if they are properly identified by hard X-ray observations, in particular by the slope of their 2-10 keV continuum. To verify this idea we obtained black hole mass estimates and X-ray data for a sample of 60 narrow line Seyfert 1 galaxies that we consider to be the most promising SEAMBH candidates. We demonstrate that the distances derived by the new method for the objects in the sample get closer to the standard luminosity distances as the hard X-ray continuum gets steeper. The results allow us to analyze the requirements for using the method in future samples of active black holes and to demonstrate that the expected uncertainty, given large enough samples, can make them into a useful, new cosmological ruler.
description: 5 pages, 1 figure, Accepted by Physical Review Letters
Flows and polarization of early photons with magnetic field at strong coupling
Creators: name: Yee, Ho-Ung
Publisher: name: arXiv
Year: 2013
Subjects: subject: Nuclear Theory (nucl-th)
subject: High Energy Physics - Theory (hep-th)
subject: Nuclear Experiment (nucl-ex)
subject: FOS: Physical sciences

description: Recent experimental results from RHIC and LHC on hard photon emission rates in heavy-ion collisions indicate a large azimuthal asymmetry of photon emission rate parameterized by the elliptic flow v_2. Motivated by a recent proposal that the early magnetic field created by two colliding heavy-ions may be responsible for this large azimuthal asymmetry of photon emission rate, we compute the azimuthal dependence of the photon emission rate from a strongly coupled finite temperature plasma with magnetic field in the framework of gauge/gravity correspondence. We also propose and compute a new observable, "in/out-plane polarization asymmetry", constructed from the polarization dependence of the photon emission rates. We observe that both the azimuthal and polarization asymmetry of photon emissions are strongly affected by the triangle anomaly (chiral anomaly) for low frequency regime below 1 GeV.
description: 25 pages, 7 figures
Spin-chain model for strongly interacting one-dimensional Bose-Fermi mixtures
Creators: name: Deuretzbacher, Frank
name: Becker, D.
name: Bjerlin, J.
name: Reimann, S.M.
name: Santos, Luis
Publisher: name: College Park, MD : American Physical Society
Year: 2017
Subjects: subject: Antiferromagnetism
subject: Bosons
subject: Ground state
subject: Local density approximation
subject: Mixtures
subject: Spin dynamics
subject: Wave functions
subject: Antiferromagnetics
subject: Bose-Fermi mixtures
subject: Exact diagonalization
subject: Ground state wavefunctions
subject: Interaction strength
subject: Momentum distributions
subject: Noninteracting fermions
subject: Spin chain models
subject: Chains
subject: Dewey Decimal Classification::500 | Naturwissenschaften::530 | Physik

description: Strongly interacting one-dimensional (1D) Bose-Fermi mixtures form a tunable XXZ spin chain. Within the spin-chain model developed here, all properties of these systems can be calculated from states representing the ordering of the bosons and fermions within the atom chain and from the ground-state wave function of spinless noninteracting fermions. We validate the model by means of an exact diagonalization of the full few-body Hamiltonian in the strongly interacting regime. Using the model, we explore the phase diagram of the atom chain as a function of the boson-boson (BB) and boson-fermion (BF) interaction strengths and calculate the densities, momentum distributions, and trap-level occupancies for up to 17 particles. In particular, we find antiferromagnetic (AFM) and ferromagnetic (FM) order and a demixing of the bosons and fermions in certain interaction regimes. We find, however, no demixing for equally strong BB and BF interactions, in agreement with earlier calculations that combined the Bethe ansatz with a local-density approximation. © 2017 American Physical Society.
Method of dynamic resonance tuning in spintronics of nanosystems
Creators: name: Yukalov, V. I.
name: Yukalova, E. P.
Publisher: name: arXiv
Year: 2022
Subjects: subject: Applied Physics (physics.app-ph)
subject: Mesoscale and Nanoscale Physics (cond-mat.mes-hall)
subject: FOS: Physical sciences

description: A method is advanced allowing for fast regulation of magnetization direction in magnetic nanosystems. The examples of such systems are polarized nanostructures, magnetic nanomolecules, magnetic nanoclusters, magnetic graphene, dipolar and spinor trapped atoms, and quantum dots. The emphasis in the paper is on magnetic nanomolecules and nanoclusters. The method is based on two principal contrivances: First, the magnetic sample is placed inside a coil of a resonant electric circuit creating a feedback field, and second, there is an external magnetic field that can be varied so that to dynamically support the resonance between the Zeeman frequency of the sample and the natural frequency of the circuit during the motion of the sample magnetization. This method can find applications in the production of memory devices and other spintronic appliances.
description: Latex file, 15 pages, 5 figures
Rough semimartingales and $p$-variation estimates for martingale transforms
Creators: name: Friz, Peter
name: Zorin-Kranich, Pavel
Publisher: name: arXiv
Year: 2020
Subjects: subject: Probability (math.PR)
subject: Classical Analysis and ODEs (math.CA)
subject: FOS: Mathematics
subject: 60L20 (Primary) 60G44, 60G46, 60H05 (Secondary)

description: We establish a new scale of $p$-variation estimates for martingale paraproducts, martingale transforms, and Itô integrals, of relevance in rough paths theory, stochastic, and harmonic analysis. As an application, we introduce rough semimartingales, a common generalization of classical semimartingales and (controlled) rough paths, and their integration theory.
description: v2: 40 pages, corrected following referee reports
Modelling the chemical evolution of the Galaxy halo
Creators: name: Brusadin, G.
name: Matteucci, F.
name: Romano, D.
Publisher: name: arXiv
Year: 2013
Subjects: subject: Astrophysics of Galaxies (astro-ph.GA)
subject: FOS: Physical sciences

description: We study the chemical evolution and formation of the Galactic halo through the analysis of its stellar metallicity distribution function and some key elemental abundance patterns. Starting from the two-infall model for the Galaxy, which predicts too few low-metallicity stars, we add a gas outflow during the halo phase with a rate proportional to the star formation rate through a free parameter, lambda. In addition, we consider a first generation of massive zero-metal stars in this two-infall + outflow model adopting two different top-heavy initial mass functions and specific population III yields. The metallicity distribution function of halo stars, as predicted by the two-infall + outflow model shows a good agreement with observations, when the parameter lambda=14 and the time scale for the first infall, out of which the halo formed, is not longer than 0.2 Gyr, a lower value than suggested previously. Moreover, the abundance patterns [X/Fe] vs. [Fe/H] for C, N and alpha-elements O, Mg, Si, S, Ca show a good agreement with the observational data. If population III stars are included, under the assumption of different initial mass functions, the overall agreement of the predicted stellar metallicity distribution function with observational data is poorer than in the case without population III. We conclude that it is fundamental to include both a gas infall and outflow during the halo formation to explain the observed halo metallicity distribution function, in the framework of a model assuming that the stars in the inner halo formed mostly in situ. Moreover, we find that it does not exist a satisfactory initial mass function for population III stars which reproduces the observed halo metallicity distribution function. As a consequence, there is no need for a first generation of only massive stars to explain the evolution of the Galactic halo.
description: Accepted for publication in A&A. 11 pages, 5 figures
Properties and anisotropy behaviour of a nickel base alloy material produced by robot-based wire and arc additive manufacturing
Creators: name: Hassel, Thomas
name: Carstensen, Torben
Publisher: name: Heidelberg : Springer
Year: 2020
Subjects: subject: Additive manufacturing
subject: Anisotropy
subject: Inconel
subject: Nickel alloys
subject: Properties
subject: WAAM
subject: 3D printers
subject: Additives
subject: Machinery
subject: Optical anisotropy
subject: Powder metals
subject: Robot applications
subject: Robots
subject: Scanning electron microscopy
subject: Tensile testing
subject: Welding
subject: Anisotropic behaviours
subject: Anisotropic material
subject: Crystallographic orientations
subject: Deformation behaviour
subject: High-performance components
subject: Micro tensile tests
subject: Nickel base alloys
subject: Static strength tests
subject: Dewey Decimal Classification::600 | Technik
subject: Dewey Decimal Classification::600 | Technik::620 | Ingenieurwissenschaften und Maschinenbau

description: In order to produce three-dimensional components from metals, a wide variety of processes exist. Laser processes combined with metal powders are frequently used and developed. Restrictive factors are the machine-related small workspace, the machinery costs and the material portfolio, which place the technology in the area of high-performance components. Wire and arc additive manufacturing (WAAM), as a robust and economical welding process technology in combination with robot applications, represents an option to become more size-independent and provides variability in the range of materials. This work shows results for the robot-based WAAM of structures made from nickel alloy 617. The main focus of the investigation was the determination of the mechanical properties in the as-welded state for which static strength tests, microhardness and metallographic studies were carried out. The anisotropic material behaviour in relation to the build direction (BD) was tested. The direction-dependent strength properties of single-track welded structures are presented with samples taken and tested at 0°, 45° and 90° to the BD. The deformation behaviour was investigated by micro-tensile tests in a scanning electron microscope, whereby the formation of sliding steps on the polished surface under tensile stress was studied. The anisotropic behaviour of the WAAM structures is discussed under consideration of the microstructure and with regard to the grain size development and phase formation. The results indicate an anisotropic material behaviour in the as-welded state based of the crystallographic orientation of the material. © 2020, The Author(s).
Randomness Quantification for Quantum Random Number Generation Based on Detection of Amplified Spontaneous Emission Noise
Creators: name: Yang, Jie
name: Fan, Fan
name: Liu, Jinlu
name: Su, Qi
name: Li, Yang
name: Huang, Wei
name: Xu, Bingjie
Publisher: name: arXiv
Year: 2020
Subjects: subject: Quantum Physics (quant-ph)
subject: FOS: Physical sciences

description: The amplified spontaneous emission (ASE) noise has been extensively studied and employed to build quantum random number generators (QRNGs). While the previous relative works mainly focus on the realization and verification of the QRNG system, the comprehensive physical model and randomness quantification for the general detection of the ASE noise are still incomplete, which is essential for the quantitative security analysis. In this paper, a systematical physical model for the emission, detection and acquisition of the ASE noise with added electronic noise is developed and verified, based on which the numerical simulations are performed under various setups and the simulation results all significantly fit well with the corresponding experimental data. Then, a randomness quantification method and the corresponding experimentally verifiable approach are proposed and validated, which quantifies the randomness purely resulted from the quantum process and improves the security analysis for the QRNG based on the detection of the ASE noise. The physical model and the randomness quantification method proposed in this paper are of significant feasibility and applicable for the QRNG system with randomness originating from the detection of the photon number with arbitrary distributions.
Self Avoiding Paths Routing Algorithm in Scale-Free Networks
Creators: name: Rachadi, Abdeljalil
name: Jedra, Mohamed
name: Zahid, Noureddine
Publisher: name: arXiv
Year: 2013
Subjects: subject: Networking and Internet Architecture (cs.NI)
subject: Computational Physics (physics.comp-ph)
subject: FOS: Computer and information sciences
subject: FOS: Physical sciences

description: In this paper, we present a new routing algorithm called "the Self Avoiding Paths Routing Algorithm". Its application to traffic flow in scale-free networks shows a great improvement over the so called "efficient routing" protocol while at the same time maintaining a relatively low average packet travel time. It has the advantage of minimizing path overlapping throughout the network in a self consistent manner with a relatively small number of iterations by maintaining an equilibrated path distribution especially among the hubs. This results in a significant shifting of the critical packet generation rate over which traffic congestion occurs, thus permitting the network to sustain more information packets in the free flow state. The performance of the algorithm is discussed both on a Barábasi-Albert (BA) network and real autonomous system (AS) network data.
description: Published in Chaos: An Interdisciplinary Journal of Nonlinear Science
Unterrichtsqualität in den Fachdidaktiken im deutschsprachigen Raum – zwischen Generik und Fachspezifik = Teaching quality in different subject matters in German-speaking countries—Inbetween genericness and subject-specificity
Creators: name: Praetorius, Anna-Katharina
name: Herrmann, Christian
name: Gerlach, Erin
name: Zülsdorf-Kersting, Meik
name: Heinitz, Benjamin
name: Nehring, Andreas
Publisher: name: Wiesbaden : Springer VS
Year: 2020
Subjects: subject: History education
subject: Instructional quality
subject: Physical education
subject: Science education
subject: Subject matters
subject: Synthesis
subject: Teaching quality
subject: Dewey Decimal Classification::300 | Sozialwissenschaften, Soziologie, Anthropologie::370 | Erziehung, Schul- und Bildungswesen

description: In this synthesis paper, the current state of research regarding teaching quality is discussed comparing science education, physical education, and history education, by referring to research on teaching in general. A framework with seven dimensions (Praetorius and Charalambous 2018) was used as a comparison base. This framework contains the dimensions of selecting and introducing the content and subject matter methods, cognitive activation, support of practicing, formative assessment, support of all students’ learning, socio-emotional support, and classroom management. The comparison across subject matters showed that subject-specificity was dependent on the level under consideration: On the dimension level, no adaptations and supplementations were deemed necessary. On the level of sub-dimensions, and especially on the level of observable indicators for these sub-dimensions, this was, however, the case. Challenges for future research are discussed. © 2020, The Author(s).
description: Im vorliegenden Diskussionsbeitrag wird der Forschungsstand zu Unterrichtsqualität für verschiedene Fachdidaktiken – naturwissenschaftliche Fächer, Sport und Geschichte – vor dem Hintergrund der allgemeinen empirischen Unterrichtsforschung vergleichend diskutiert. Als Vergleichsgrundlage wurde ein Framework mit den sieben Dimensionen Auswahl und Thematisierung von Inhalten und Fachmethoden, kognitive Aktivierung, Unterstützung des Übens, formatives Assessment, Unterstützung des Lernens aller Schülerinnen und Schüler, sozio-emotionale Unterstützung und Klassenführung genutzt (Praetorius und Charalambous 2018). Es zeigte sich, dass die Fachspezifität von der fokussierten Ebene abhing: Während eine Ergänzung des Frameworks auf Ebene der sieben Dimensionen nicht notwendig erschien, waren auf der Ebene der Subdimensionen und insbesondere der diesen Subdimensionen zugeordneten beobachtbaren Indikatoren fachspezifische Anpassungen und Ergänzungen erforderlich. Der Beitrag schließt mit einer Diskussion zentraler Herausforderungen für zukünftige Forschung.
Risk Assessment Using Practical and Innovative Diagnostic Tools for Type II Diabetes Mellitus in Low-Middle Income Countries and High-Income Countries: A Rapid Review Protocol
Creators: name: Shivika Marwaha
Publisher: name: Open Science Framework
Year: 2023
Subjects: subject: Medicine and Health Sciences
subject: Engineering
subject: Social and Behavioral Sciences
subject: Type 2 Diabetes Mellitus, Low-Middle Income Countries, High-Income Countries, Weighted Risk Scores, Screening

description: A Rapid Review Protocol
title: Das römische Kastell Aliso, der Teutoburger Wald und die Pontes Longi / Zur Geschichte der Kriege zwischen den Römern und Deutschen in den Jahren 11 vor, bis 16 nach dem Beginne unserer Zeitrechnung, von M. F. Essellen
Creators: name: Ritter, Franz Von
Publisher: name: University Library Heidelberg
Year: 2016

description: Rezension zu: Das römische Kastell Aliso, der Teutoburger Wald und die Pontes Longi. Ein Beitrag zur Geschichte der Kriege zwischen den Römern und den Deutschen in der Zeit vom Jahre 12 vor bis zum Frühjahre 16 nach Christus. Von M. F. Essellen, Königlich Preussischen Hofrathe. Mit vier Karten und einem Anhange "Ueber die alten Steindenkmäler, die sogen. Hünenbetten in Westphalen und den angrenzenden Provinzen". Hannover. Carp Rümpler. 1857. VIII u. 232 u. XXIV S. 8°. Rezension zu: Zur Geschichte der Kriege zwischen den Römern und Deutschen in den Jahren 11 vor, bis 16 nach dem Beginne unserer Zeitrechnung. Eine Aghandlung, worin besonders der Inhalt neuerer Werke über diesen Gegenstand besprochen wird, von M. F. Essellen, Königlich Preussischen Hofrathe. Mit Abildungen gefundener Antiquitäten auf einer Tafel. Hamm. G. Grote'sche Buchhandlung (C. Müller). 1862. S. 8°.
Detection of a cyclic period change in the contact binary TU UMi
Creators: name: Çamurdan, Dicle Zengin
name: Özkardeş, Burcu
Publisher: name: arXiv
Year: 2022
Subjects: subject: Solar and Stellar Astrophysics (astro-ph.SR)
subject: FOS: Physical sciences

description: This study aims at timing the eclipses of the binary star TU UMi. The times of minima are taken from the literature, from our observations in April 2004 and from TESS observations between 2019 and 2022. The orbital period analysis of the system indicates that there is a cyclic oscillation with an amplitude of 0.0081d and a period of 9.03 yr, accompanied by a continuous decrease at a rate of $dP/dt =-1.12 \times 10^{-7}\,\mathrm{d}\, \mathrm{yr}^{-1}$. We study the secular evolution of the orbital period of the system and the possibility of the existence of a third companion or the magnetic activity cycle of the primary component in the system.
description: 21 page, 5 figures
Influencing factors for the digital transformation in the financial services sector
Creators: name: Werth, Oliver
name: Schwarzbach, Christoph
name: Rodríguez Cardona, Davinia
name: Breitner, Michael H.
name: Schulenburg, Johann-Matthias Graf Von Der
Publisher: name: Heidelberg : Springer
Year: 2020
Subjects: subject: Banks and Insurances
subject: Digital Transformation
subject: Financial Services Sector
subject: Influencing Factors
subject: Qualitative Research
subject: Dewey Decimal Classification::300 | Sozialwissenschaften, Soziologie, Anthropologie::330 | Wirtschaft
subject: Dewey Decimal Classification::300 | Sozialwissenschaften, Soziologie, Anthropologie::340 | Recht

description: Digital transformation affects almost every area in societies and has consequences for incumbent companies. With qualitative research, we explore the influencing factors for digital transformation in the financial services sector. We use a PEST-model and Porter’s Five Forces as the underlying structure for our analysis. Our interviews and findings show that the financial services sector face the same current challenges, but their impact is perceived higher in the banking than in the insurance sector concerning social factors and bargaining power of buyers. The character of the current development is evolutionary rather than disruptive. Almost all incumbents currently focus on modernizing and consolidating their backend-systems. The aim is to enable them for new customer-oriented services. A primary driver for the digital transformation is the threat of a broader market entry by BigTechs. Our research provides a comprehensive overlook about the influencing factors of digital transformation using statements from experts in the field. © 2020, The Author(s).
Negativity vs. Purity and Entropy in Witnessing Entanglement
Creators: name: Schneeloch, James
name: Jacinto, H Shelton
name: Tison, Christopher C.
name: Alsing, Paul M.
Publisher: name: arXiv
Year: 2020
Subjects: subject: Quantum Physics (quant-ph)
subject: FOS: Physical sciences

description: In this work, we show that while all measures of mixedness may be used to witness entanglement, all such entangled states must have a negative partial transpose (NPT). Though computing the negativity of the partial transpose scales well at high dimension, it relies on knowing the complete quantum state, which does not. To address this, we compare different measures of mixedness over uniform ensembles of joint quantum states at varying dimension to gauge their relative success in witnessing entanglement. In doing so, we find that comparing joint and marginal purities is overwhelmingly more successful at high dimension at identifying entanglement than comparing joint and marginal von Neumann entropies, in spite of requiring fewer resources. We conclude by showing how our results impact the fundamental relationship between correlation and entanglement and related witnesses.
description: 13 pages, 4 figures
Tailoring band gaps of insulators by adsorption at surface defects: Benzoic acids on NaCl surfaces
Creators: name: Chen, Wei
name: Tegenkamp, Christoph
name: Pfnür, Herbert
name: Bredow, Thomas
Publisher: name: College Park, MD : American Physical Society
Year: 2009
Subjects: subject: Dewey Decimal Classification::500 | Naturwissenschaften::530 | Physik

description: The adsorption of benzoic acid and its OH-substituted derivatives, namely, salicylic acid (SA) and parasalicylic acid on various NaCl surfaces has been investigated by density-functional theory with hybrid exchange-correlation functional. The ideal NaCl(100) surface is chemically inert as evidenced by the low binding energies. The molecular adsorption can be enhanced by both an anion vacancy and a surface step site. The bonding between the surface Na and the carboxylic O atom is of covalent character for all adsorption geometries. Our calculations show that the adsorption of SA has the largest binding energy of all three acids due to the additional interaction between Na and the phenolic O atom. Charge transfer between the molecule and the surface is generally very small, except in the presence of an anion vacancy where the unpaired electron is mostly transferred to the adsorbate. Surface defects generally have a strong influence on the electronic structure of the adsorbed molecules. Specifically, the adsorption of SA at [011]-oriented steps can significantly reduce the effective band gap to 1.6 eV due to the up shift of the Cl3p levels at the undercoordinated step edge. Implications of these results to the contact charging effect between wide-band-gap insulators will be discussed. © 2009 The American Physical Society.
title: Vorträge und Forschungen: Sonderbände, Vol 12 (1973): Matthias Werner: Die Gründungstradition des Erfurter Petersklosters
Creators: name: Vorträge Und Forschungen: Sonderbände
Publisher: name: University Library Heidelberg
Year: 2015

description: Die Gründungstradition des Erfurter Petersklosters
The interplay between forming planets and photo-evaporating discs I: Forbidden line diagnostics
Creators: name: Weber, Michael L.
name: Ercolano, Barbara
name: Picogna, Giovanni
name: Rab, Christian
Publisher: name: arXiv
Year: 2022
Subjects: subject: Earth and Planetary Astrophysics (astro-ph.EP)
subject: Solar and Stellar Astrophysics (astro-ph.SR)
subject: FOS: Physical sciences

description: Disc winds and planet formation are considered to be two of the most important mechanisms that drive the evolution and dispersal of protoplanetary discs and in turn define the environment in which planets form and evolve. While both have been studied extensively in the past, we combine them into one model by performing three-dimensional radiation-hydrodynamic simulations of giant planet hosting discs that are undergoing X-ray photo-evaporation, with the goal to analyse the interactions between both mechanisms. In order to study the effect on observational diagnostics, we produce synthetic observations of commonly used wind-tracing forbidden emission lines with detailed radiative transfer and photo-ionisation calculations. We find that a sufficiently massive giant planet carves a gap in the gas disc that is deep enough to affect the structure and kinematics of the pressure-driven photo-evaporative wind significantly. This effect can be strong enough to be visible in the synthetic high-resolution observations of some of our wind diagnostic lines, such as the [OI] 6300 Å or [SII] 6730 Å lines. When the disc is observed at inclinations around 40° and higher, the spectral line profiles may exhibit a peak in the redshifted part of the spectrum, which cannot easily be explained by simple wind models alone. Moreover, massive planets can induce asymmetric substructures within the disc and the photo-evaporative wind, giving rise to temporal variations of the line profiles that can be strong enough to be observable on timescales of less than a quarter of the planet's orbital period.
description: Accepted for publication in MNRAS. 13+3 pages, 8+1 figures
Theory of interacting dislocations on cylinders
Creators: name: Amir, Ariel
name: Paulose, Jayson
name: Nelson, David R.
Publisher: name: arXiv
Year: 2013
Subjects: subject: Soft Condensed Matter (cond-mat.soft)
subject: Materials Science (cond-mat.mtrl-sci)
subject: Statistical Mechanics (cond-mat.stat-mech)
subject: FOS: Physical sciences

description: We study the mechanics and statistical physics of dislocations interacting on cylinders, motivated by the elongation of rod-shaped bacterial cell walls and cylindrical assemblies of colloidal particles subject to external stresses. The interaction energy and forces between dislocations are solved analytically, and analyzed asymptotically. The results of continuum elastic theory agree well with numerical simulations on finite lattices even for relatively small systems. Isolated dislocations on a cylinder act like grain boundaries. With colloidal crystals in mind, we show that saddle points are created by a Peach-Koehler force on the dislocations in the circumferential direction, causing dislocation pairs to unbind. The thermal nucleation rate of dislocation unbinding is calculated, for an arbitrary mobility tensor and external stress, including the case of a twist-induced Peach-Koehler force along the cylinder axis. Surprisingly rich phenomena arise for dislocations on cylinders, despite their vanishing Gaussian curvature.
title: Vorträge und Forschungen: Sonderbände, Vol 15 (1974): Thomas L. Zotz: Der Breisgau und das alemannische Herzogtum
Creators: name: Vorträge Und Forschungen: Sonderbände
Publisher: name: University Library Heidelberg
Year: 2015

description: Zur Verfassungs- und Besitzgeschichte

im 10. und beginnenden 11. Jahrhundert
description: Zur Verfassungs- und Besitzgeschichte

im 10. und beginnenden 11. Jahrhundert
description: Der Breisgau und das alemannische Herzogtum. Zur Verfassungs- und Besitzgeschichte im 10. und beginnenden 11. Jahrhundert
Nanolithography with an atomic force microscope : quantum point contacts, quantum dots, and quantum rings
Creators: name: Keyser, Ulrich Felix
Publisher: name: Hannover : Universität
Year: 2002
Subjects: subject: Nano fabrication
subject: Kondo effect
subject: Aharonov-Bohm effect
subject: Dewey Decimal Classification::500 | Naturwissenschaften::530 | Physik

description: [no abstract]
Nanoporous silica nanoparticles and bone morphogenetic protein 2 for bone regeneration
Creators: name: Satalov, Alexandra
Publisher: name: Hannover : Gottfried Wilhelm Leibniz Universität Hannover
Year: 2017
Subjects: subject: Nanoporous silica nanoparticles
subject: bone morphogenetic protein 2
subject: growth factor delivery
subject: scaffolds
subject: osteogenic differentiation
subject: bone regeneration
subject: tendon-bone interface regeneration
subject: Nanoporöse Silica-Nanopartikel
subject: Wachstumsfaktorenfreisetzung
subject: osteogene Differenzierung
subject: Knochenregenration
subject: Regeneration von Sehnen-Knochen-Übergängen
subject: Dewey Decimal Classification::600 | Technik::610 | Medizin, Gesundheit

description: [no abstract]
title: Vorträge und Forschungen: Sonderbände, Vol 17 (1975): Friedrich Lotter: Der Brief des Priesters Gerhard an den Erzbischof Friedrich von Mainz
Creators: name: Vorträge Und Forschungen: Sonderbände
Publisher: name: University Library Heidelberg
Year: 2015

description: Ein kanonistisches Gutachten aus frühottonischer Zeit
description: Ein kanonistisches Gutachten aus frühottonischer Zeit
description: Der Brief des Priesters Gerhard an den Erzbischof Friedrich von Mainz. Ein kanonistisches Gutachten aus frühottonischer Zeit