cometadata/datacite-rtg-text-other-reclassification-records huggingface dataset:
Wear in wind turbine pitch bearings—A comparative design study
Creators: name: Schwack, Fabian
name: Halmos, Fabian
name: Stammler, Matthias
name: Poll, Gerhard
name: Glavatskih, Sergei
Publisher: name: Chichester : Wiley
Year: 2021
Subjects: subject: bearing design
subject: blade bearing
subject: downscaled experiments
subject: individual pitch control
subject: Turbomachine blades
subject: Wind
subject: Wind power
subject: Wind turbines
subject: Bearing designs
subject: Blade bearing
subject: Design studies
subject: Downscaled experiment
subject: Experimental conditions
subject: Individual pitch control
subject: Learn+
subject: Oscillating motion
subject: Outer diameters
subject: Severe wears
subject: Wear of materials
subject: Dewey Decimal Classification::600 | Technik::620 | Ingenieurwissenschaften und Maschinenbau

description: We tested two types of ball bearings with an outer diameter of 750 mm to learn more about the challenges of oscillating motions for pitch bearings. The experimental conditions are derived from aero-elastic simulations, long-term wind speed measurements and a scaling method that considers loads and pitch angles. As a result, the parameters relevant for pitch bearings are represented appropriately, and the findings are transferable to other bearing sizes. For the tested parameter sets, severe wear occurred for over 90% of the exposed contact areas after 12 500 oscillating cycles. Decreasing the number of cycles to 1250 leads to a mix of exposed areas with 13% severe wear, 32% mild wear and 55% no wear, with no apparent pattern. The results demonstrate that a comparatively small amount of consecutive cycles can lead to severe wear. A new type of bearing tested showed less wear for the selected operating conditions. © 2021 The Authors. Wind Energy published by John Wiley & Sons Ltd.
Heat rectification through single and coupled quantum dots
Creators: name: Tesser, Ludovico
name: Bhandari, Bibek
name: Erdman, Paolo Andrea
name: Paladino, Elisabetta
name: Fazio, Rosario
name: Taddei, Fabio
Publisher: name: arXiv
Year: 2021
Subjects: subject: Mesoscale and Nanoscale Physics (cond-mat.mes-hall)
subject: FOS: Physical sciences

description: We study heat rectification through quantum dots in the Coulomb blockade regime using a master equation approach. We consider both cases of two-terminal and four-terminal devices. In the two-terminal configuration, we analyze the case of a single quantum dot with either a doubly-degenerate level or two non-degenerate levels. In the sequential tunneling regime we analyze the behaviour of heat currents and rectification as functions of the position of the energy levels and of the temperature bias. In particular, we derive an upper bound for rectification in the closed-circuit setup with the doubly-degenerate level. We also prove the absence of a bound for the case of two non-degenerate levels and identify the ideal system parameters to achieve nearly perfect rectification. The second part of the paper deals with the effect of second-order cotunneling contributions, including both elastic and inelastic processes. In all cases we find that there exists ranges of values of parameters (such as the levels' position) where rectification is enhanced by cotunneling. In particular, in the doubly-degenerate level case we find that cotunneling corrections can enhance rectification when they reduce the magnitude of the heat currents. For the four-terminal configuration, we analyze the non-local situation of two Coulomb-coupled quantum dots, each connected to two terminals: the temperature bias is applied to the two terminals connected to one quantum dot, while the heat currents of interest are the ones flowing in the other quantum dot. Remarkably, in this situation we find that non-local rectification can be perfect as a consequence of the fact that the heat currents vanish for properly tuned parameters.
description: 26 pages, 19 figures, accepted version
Entwicklung eines modularen Gestensteuerungssystems
Creators: name: Nasri, Habib
Publisher: name: Hannover : Gottfried Wilhelm Leibniz Universität Hannover
Year: 2015
Subjects: subject: Gesture control
subject: motion detection
subject: real-time
subject: modularity
subject: Gestensteuerung
subject: Bewegungserfassung
subject: Echtzeit
subject: Modularität
subject: Dewey Decimal Classification::600 | Technik

description: [no abstract]
Repulsively induced photon super-bunching in driven resonator arrays
Creators: name: Grujic, Thomas
name: Clark, Stephen R.
name: Jaksch, Dieter
name: Angelakis, Dimitris G.
Publisher: name: arXiv
Year: 2012
Subjects: subject: Quantum Physics (quant-ph)
subject: FOS: Physical sciences

description: We analyze the non-equilibrium behaviour of driven nonlinear photonic resonator arrays under the selective excitation of specific photonic many-body modes. Targeting the unit-filled ground state, we find a counter-intuitive `super bunching' in the emitted photon statistics in spite of relatively strong onsite repulsive interaction. We consider resonator arrays with Kerr nonlinearities described by the Bose Hubbard model, but also show that an analogous effect is observable in near-future experiments coupling resonators to two-level systems as described by the Jaynes Cummings Hubbard Hamiltonian. For the experimentally accessible case of a pair of coupled resonators forming a photonic molecule, we provide an analytical explanation for the nature of the effect.
description: 5 pages, 5 figures
Fully Convective Magnetorotational Turbulence in Stratified Shearing Boxes
Creators: name: Bodo, G.
name: Cattaneo, F.
name: Mignone, A.
name: Rossi, P.
Publisher: name: arXiv
Year: 2013
Subjects: subject: High Energy Astrophysical Phenomena (astro-ph.HE)
subject: Solar and Stellar Astrophysics (astro-ph.SR)
subject: FOS: Physical sciences

description: We present a numerical study of turbulence and dynamo action in stratified shearing boxes with zero magnetic flux. We assume that the fluid obeys the perfect gas law and has finite (constant) thermal diffusivity. We choose radiative boundary conditions at the vertical boundaries in which the heat flux is propor- tional to the fourth power of the temperature. We compare the results with the corresponding cases in which fixed temperature boundary conditions are applied. The most notable result is that the formation of a fully convective state in which the density is nearly constant as a function of height and the heat is transported to the upper and lower boundaries by overturning motions is robust and persists even in cases with radiative boundary conditions. Interestingly, in the convective regime, although the diffusive transport is negligible the mean stratification does not relax to an adiabatic state.
description: 11 pages, 4 figures, accepted for publication in ApJ Letters
Intermediate effective interactions and dynamical fermion mass generation of QCD
Creators: name: Li, Ming-Fan
name: Luo, Mingxing
Publisher: name: arXiv
Year: 2013
Subjects: subject: High Energy Physics - Theory (hep-th)
subject: FOS: Physical sciences

description: The functional renormalization group equation is expanded to a two-loop form. This two-loop form equation involves one-loop effective action. An intermediate effective action perspective is adopted toward the one-loop effective action. That is to say, the intermediate effective action could not be of the same form of the bare action and one can make an ansatz to it. Thus by focusing on different high dimensional operators, effects of the chosen operators can be investigated. QCD through intermediate fermion-4 interactions is investigated. Of the 6 kinds of fermion-4 interactions generated by one-loop QCD, 4 kinds generate fermion mass while the other 2 kinds degenerate it. The net effect is fermion mass degeneration when dimensionless mass is large. Flow patterns on the $\tilde{m}^2_{\text{phys.}}-\tilde{g}^2$ plane are drawn.
description: 6 pages, 5 figures, revtex4
An optical-flow-based monitoring method for measuring translational motion in infrared-thermographic images of AFP processes
Creators: name: Denkena, Berend
name: Schmidt, Carsten
name: Timmermann, Marc
name: Friedel, Andreas
Publisher: name: Berlin : Springer
Year: 2022
Subjects: subject: Automated-fiber-placement
subject: Optical-flow
subject: Prepreg
subject: Process monitoring
subject: Thermography
subject: Access control
subject: Classification (of information)
subject: Optical flows
subject: Process control
subject: Thermography (imaging)
subject: Data access
subject: Fibre placement
subject: Flow based
subject: IR images
subject: Localisation
subject: Monitoring methods
subject: Novel methods
subject: Prepregs
subject: Translational motions
subject: Dewey Decimal Classification::600 | Technik::620 | Ingenieurwissenschaften und Maschinenbau

description: This paper presents a novel method for a precise localization of the automated-fiber-placement head, without the need for a data access to the machine control. It is based on a sub-pixel accurate optical-flow-algorithm which determines information about the heads movement by means of the material flow in sequences of IR images. Using local curvatures in the temperature field of the IR images, feature matrices are created which can locally be compared to the features of successive images. Thus, the translation between images become visible. This enables the possibility to perform an accurate (16.8μm) and self-sufficient process monitoring that additionally is capable of capturing the motion and position information of the AFP system and can be linked to existing algorithms for defect detection and classification. © 2021, The Author(s).
µCT-Based Topography Analysis of Inaccessible Surfaces Exemplified by a Biofouling-Covered Plastic
Creators: name: Bittner, Florian
name: Endres, Hans-Josef
Publisher: name: Weinheim : Wiley-VCH
Year: 2022
Subjects: subject: Biodegradable polymers
subject: Biodegradation
subject: Computerized tomography
subject: Nondestructive examination
subject: Topography
subject: Comparative measurements
subject: Marine environment
subject: Measurements of
subject: Optical profilometry
subject: Optical sensing
subject: Plastic biodegradation
subject: Plastic sample
subject: Polyhydroxybutyrate
subject: Solid films
subject: Tactile sensing
subject: Surface roughness
subject: Dewey Decimal Classification::500 | Naturwissenschaften::540 | Chemie
subject: Dewey Decimal Classification::600 | Technik::660 | Technische Chemie

description: The measurement of surface topographies is usually restricted to surfaces that are directly accessible to tactile or optical sensing. With this paper, the application of micro-computed tomography to measure characteristics of surfaces that are covered by solid films and thus not directly accessible is demonstrated. The method is first validated by comparative measurements of a plastic sample with µCT and conventional optical profilometry. Afterwards, the µCT-based method is successfully applied to a polyhydroxybutyrate plastic sample covered by biofouling after exposure to marine environment, providing insight into the degradation processes. © 2021 The Authors. Chemie Ingenieur Technik published by Wiley-VCH GmbH
Demonstration of Feeding Vehicle-Integrated Photovoltaic-Converted Energy into the High-Voltage On-Board Network of Practical Light Commercial Vehicles for Range Extension
Creators: name: Peibst, Robby
name: Fischer, Hilke
name: Brunner, Manuel
name: Schießl, Andreas
name: Wöhe, S.
name: Wecker, Reinhard
name: Haase, Felix
name: Schulte-Huxel, Henning
name: Blankemeyer, Susanne
name: Köntges, Marc
name: Hollemann, Christina
name: Brendel, Rolf
name: Wetzel, Gustav
name: Krügener, Jan
name: Nonnenmacher, Hermann
name: Mehlich, Heiko
name: Salavei, Andrei
name: Ding, Kaining
name: Lambertz, Andreas
name: Pieters, Bart
name: Janke, Stefan
name: Stannowski, Bernd
name: Korte, Lars
Publisher: name: Weinheim : Wiley-VCH
Year: 2021
Subjects: subject: demonstrator vehicles
subject: energy flow analysis
subject: test drives
subject: vehicle-integrated photovoltaics
subject: Commercial vehicles
subject: DC-DC converters
subject: Heterojunctions
subject: Irradiation
subject: Photovoltaic cells
subject: Secondary batteries
subject: Silicon
subject: Solar power generation
subject: Demonstrator vehicle
subject: Energy
subject: Energy flow analysis
subject: High-voltages
subject: Light commercial vehicles
subject: On-board network
subject: Photovoltaics
subject: Range extensions
subject: Test drive
subject: Vehicle-integrated photovoltaic
subject: Maximum power point trackers
subject: Dewey Decimal Classification::600 | Technik

description: The setting up of a practical electrically driven light commercial demonstration vehicle with integrated photovoltaics (PV) is reported. The demonstrator vehicle is equipped with 15 modules based on the crystalline Si/amorphous Si heterojunction technology. The nominal total peak power under standard testing conditions is 2180 Wp. Specifically, the PV-converted energy is fed into the high-voltage (HV; 400 V) board-net for a utilization of the large capacity of the HV battery and thus for direct range extension. The demonstrator vehicle is equipped with irradiation, wind, temperature, magnetic, and global positioning system sensors. Irradiation and temperature as well as the energy flows from modules, maximum power point trackers (MPPTs), low-voltage buffer battery to HV battery via DC/DC, and from the HV battery to the loads during an exemplarily test drive day (May 31, 2021) are monitored. The range extension obtained at this day on our test route (51° 59′ N, 9° 31′ E) was 36 km, the corresponding CO2 savings account for ≈2.3 kg. The chain efficiency of the electronic components from the input side of the MPPTs to the HV output side of the DC/DC was 68.6%, whereas the DC/DC itself has an average efficiency of 90%. © 2021 The Authors. Solar RRL published by Wiley-VCH GmbH
title: Effect of Supplemental Prebiotics, Probiotics and Bioactive Proteins on the Microbiome Composition and Gut Physiology in C57BL6/J Mice
Creators: name: Li, Ye
Publisher: name: Utah State University
Year: 2019

description: The composition and metabolic activity of the microbiome affect many aspects of health, and there is current interest in dietary constituents that may affect this system. The purpose of this study was to evaluate the effects of a mix of probiotics, a mix of prebiotics and a bioactive protein fraction on the microbiome, when fed to mice individually and in combination. Mice were fed the total western diet (TWD) supplemented with prebiotics, probiotics, and Tri-Factor (bioactive proteins) individually and in combination for four weeks. Subsequently, effects on the composition of gut microbiome, gut short chain fatty acids (SCFAs) concentration, gut inflammation and integrity of the mucosal barrier were analyzed. Ruminococcus gnavus was increased in mice gut microbiome after feeding prebiotics. Bifidobacterium longum was increased after feeding probiotics. Probiotic was associated with higher level of Clostridium neonatale. The treatments affected beta-diversity with exception of Tri-Factor, but not alpha diversity of microbiome. All treatments were associated with lower plasma zonulin, compared to the control group, indicating an effect on gut permeability. There were no treatment effects on cecal or fecal SCFAs, and the treatments did not affect gut inflammation as measured by fecal calprotectin.
Status and physics potential of NEXT-100
Creators: name: Martin-Albo, J.
name: Gomez-Cadenas, J. J.
Publisher: name: arXiv
Year: 2013
Subjects: subject: Instrumentation and Detectors (physics.ins-det)
subject: High Energy Physics - Experiment (hep-ex)
subject: FOS: Physical sciences

description: The NEXT-100 time projection chamber, currently under construction, will search for neutrinoless double beta decay (bb0nu) using 100-150 kg of high-pressure xenon gas enriched in the Xe-136 isotope to ~91%. The detector possesses two important features for bb0nu searches: very good energy resolution (better than 1% FWHM at the Q value of Xe-136) and event topological information for the distinction between signal and background. Furthermore, the technique can be extrapolated to the ton-scale, thus allowing the full exploration of the inverted hierarchy of neutrino masses.
description: 8 pages, 3 figures, 2 tables. Invited talk at the 6th TPC Symposium on large TPCs for low energy rare event detection (Paris, Dec 2012)
Comparing the Influence of Residual Stresses in Bearing Fatigue Life at Line and Point Contact
Creators: name: Coors, Timm
name: Pape, Florian
name: Poll, Gerhard
Publisher: name: Millersville, PA : Materials Research Forum LLC
Year: 2018
Subjects: subject: Residual Stress
subject: Bearing Fatigue Life
subject: Tailored Forming
subject: Dewey Decimal Classification::600 | Technik::620 | Ingenieurwissenschaften und Maschinenbau

description: The targeted insertion of compressive residual stresses can positively influence the fatigue life of rolling element bearings. Adapted manufacturing processes such as hard turning and deep rolling can help optimising the subsurface residual stress state of these machine elements, which also improves the surface quality of the bearings raceway. In this contribution, a numerical calculation method was developed to predict the influence of residual stresses on bearing fatigue life. By means of a finite element analysis, the component stresses due to the rolling contact load can be determined. The resulting shear stresses find input in a bearing fatigue life calculation based on the approach of IOANNIDES, BERGLING and GABELLI. This statistically based method refers a material-dependent stress fatigue limit to a local stress related fatigue criterion, which is influenced by the residual stress condition. On this basis, the influence of residual stresses on two different bearing types is investigated. Line contact is represented by a cylindrical roller bearing and an angular contact ball bearing is chosen to investigate the point contact. For angular contact ball bearings, a rolling motion is superimposed by a drilling movement perpendicular to the contact plane, which is caused by the kinematics of the rolling element. The calculation method is used for bearings made of classic bearing steel and bearings made of two different steels by tailored forming in order to regard the residual stress conditions of different manufacturing types. It can be shown that the influence of residual stresses on bearing fatigue life is higher for bearings with line contact than for bearings with point contact.
Enzymatic hydrolysis of kaempferol 3-O-(2‴-O-sinapoyl-β-sophoroside), the key bitter compound of rapeseed (Brassica napus L.) protein isolate
Creators: name: Siebert, Mareike
name: Krings, Ulrich
name: Günther, Thorben
name: Fragalas, Apostolos
name: Berger, Ralf G.
Publisher: name: New York, NY : Wiley Interscience
Year: 2021
Subjects: subject: bitter off-taste
subject: ferulic acid esterase
subject: kaempferol sophoroside
subject: rapeseed protein
subject: Dewey Decimal Classification::600 | Technik::630 | Landwirtschaft, Veterinärmedizin
subject: Dewey Decimal Classification::600 | Technik::640 | Hauswirtschaft und Familienleben

description: BACKGROUND: The use of rapeseed protein for human nutrition is primarily limited by its strong bitterness, which is why the key bitter compound, kaempferol 3-O-(2‴-O-sinapoyl-β-sophoroside), is enzymatically degraded. RESULTS: Mass spectrometry analyses of an extract from an untreated rapeseed protein isolate gave three signals for m/z 815 [M-H]. The predominant compound among the three compounds was confirmed as kaempferol-3-O-(2‴-O-sinapoyl-β-sophoroside). Enzymatic hydrolysis of this key bitter compound was achieved using a sinapyl ester cleaving side activity of a ferulic acid esterase (FAE) from the basidiomycete Schizophyllum commune (ScoFAE). Recombinant ferulic acid esterases from Streptomyces werraensis (SwFAE) and from Pleurotus eryngii (PeFAE) possessed better cleavage activity towards methyl sinapate but did not hydrolyze the sinapyl ester linkage of the bitter kaempferol sophoroside. CONCLUSION: Kaempferol-3-O-(2‴-O-sinapoyl-β-sophoroside) was successfully degraded by enzymatic treatment with ScoFAE, which may provide a means to move the status of rapeseed protein from feed additive to food ingredient. © 2021 The Authors. Journal of The Science of Food and Agriculture published by John Wiley & Sons Ltd on behalf of Society of Chemical Industry. © 2021 The Authors. Journal of The Science of Food and Agriculture published by John Wiley & Sons Ltd on behalf of Society of Chemical Industry.
MPEC 2023-M51 : 2018 MY6
Creators: name: Minor Planet Center Staff
Publisher: name: The Minor Planet Center
Year: 2023
Subjects: subject: Small Solar System bodies
valueUri: http://astrothesaurus.org/uat/1469

description: The Minor Planet Electronic Circulars contain information on unusual minor planets, routine data on comets and natural satellites, and occasional editorial announcements.  They are published on behalf of Division F of the International Astronomical Union by the Minor Planet Center, Smithsonian Astrophysical Observatory, Cambridge, MA 02138, U.S.A.
High Curie temperatures at low compensation in the ferromagnetic semiconductor (Ga,Mn)As
Creators: name: Wang, M.
name: Edmonds, K. W.
name: Gallagher, B. L.
name: Rushforth, A. W.
name: Makarovsky, O.
name: Patanè, A.
name: Campion, R. P.
name: Foxon, C. T.
name: Novak, V.
name: Jungwirth, T.
Publisher: name: arXiv
Year: 2013
Subjects: subject: Mesoscale and Nanoscale Physics (cond-mat.mes-hall)
subject: FOS: Physical sciences

description: We investigate the relationship between the Curie temperature TC and the carrier density p in the ferromagnetic semiconductor (Ga,Mn)As. Carrier densities are extracted from analysis of the Hall resistance at low temperatures and high magnetic fields. Results are found to be consistent with ion channeling measurements when performed on the same samples. We find that both TC and the electrical conductivity increase monotonically with increasing p, and take their largest values when p is comparable to the concentration of substitutional Mn acceptors. This is inconsistent with models in which the Fermi level is located within a narrow isolated impurity band.
description: 10 pages, 4 figures
title: H. Delporte: L'image de la femme dans l'art préhistorique. Paris 1979
Creators: name: Hahn, Joachim
Publisher: name: University Library Heidelberg
Year: 2015

description: Rezension zu: H. Delporte: L’image de la femme dans l'art préhistorique. Editions A. et J. Picard, Paris 1979. 320 Seiten, 137 Abbildungen.
Quantum noise cancellation in asymmetric speed metres with balanced homodyne readout
Creators: name: Zhang, T.
name: Knyazev, E.
name: Steinlechner, S.
name: Khalili, F.Y.
name: Barr, B. W.
name: Bell, A. S.
name: Dupej, P.
name: Briggs, J.
name: Graf, C.
name: Callaghan, J.
name: Hennig, J. S.
name: Houston, E. A.
name: Huttner, S. H.
name: Leavey, S.S.
name: Pascucci, D.
name: Sorazu, B.
name: Spencer, A.
name: Wright, J.
name: Strain, K.A.
name: Hild, S.
name: Danilishin, S.L.
Publisher: name: Bristol : IOP Publishing Ltd.
Year: 2018
Subjects: subject: balanced homodyne detector
subject: speed metre
subject: quantum noise
subject: Dewey Decimal Classification::500 | Naturwissenschaften::530 | Physik

description: The Sagnac speed metre topology has been identified as a promising technique to reduce quantum back-action in gravitational-wave interferometers. However, imbalance of the main beamsplitter has been shown to increase the coupling of laser noise to the detection port, thus reducing the quantum noise superiority of the speed metre, compared to conventional approaches, in particular at low frequencies. In this paper, we show that by implementing a balanced homodyne readout scheme with a suitable choice of the point from which the local oscillator (LO) is derived, the excess laser noise contribution is partly compensated, and the resulting speed metre can be more sensitive than state-of-the-art position metres. This is achieved by picking-off the LO from either the reflection port of the interferometer or the anti-reflective coating surface of the main beamsplitter. We show that either approach relaxes the relative intensity noise (RIN) requirement of the input laser. For example, for a beam splitter imbalance of 0.1% in the Glasgow speed metre proof of concept experiment, the RIN requirement at frequency of 100 Hz decreases from 4 x10(-10)/root Hz to 4 x 10(-7)/root Hz, moving the RIN requirement from a value that is hard to achieve in practice, to one which is routinely obtained.
title: Quellen zur Geschichte der Alamannen II. Quellen zur Geschichte der Alamannen von Libanios bis Gregor von Tours. Heidelberger Akademie der Wissenschaften, Kommission für Alamannische Altertumskunde, Schriften Band 3. Sigmaringen/ Heidelberg 1978
Creators: name: Mildenberger, Gerhard
Publisher: name: University Library Heidelberg
Year: 2015

description: Rezension zu: Quellen zur Geschichte der Alamannen II. Quellen zur Geschichte der Alamannen von Libanios bis Gregor von Tours. Übersetzt von Camilla Dirlmeier, durchgesehen und mit Anmerkungen versehen von Günther Gottlieb. Heidelberger Akademie der Wissenschaften, Kommission für Alamannische Altertumskunde, Schriften Band 3. Jan Thorbecke Verlag, Sigmaringen/ Heidelberg 1978. 119 Seiten.
Collective strong coupling in multimode cavity QED
Creators: name: Wickenbrock, Arne
name: Hemmerling, Michal
name: Robb, Gordon R. M.
name: Emary, Clive
name: Renzoni, Ferruccio
Publisher: name: arXiv
Year: 2013
Subjects: subject: Atomic Physics (physics.atom-ph)
subject: Optics (physics.optics)
subject: Quantum Physics (quant-ph)
subject: FOS: Physical sciences

description: We study an atom-cavity system in which the cavity has several degenerate transverse modes. Mode-resolved cavity transmission spectroscopy reveals well-resolved atom-cavity resonances for several cavity modes, a signature of collective strong coupling for the different modes. Furthermore, the experiment shows that the cavity modes are coupled via the atomic ensemble contained in the cavity. The experimental observations are supported by a detailed theoretical analysis. The work paves the way to the use of interacting degenerate modes in cavity-based quantum information processing, where qubits corresponding to different cavity modes interact via an atom shared by the two modes. Our results are also relevant to the experimental realization of quantum spin glasses with ultracold atoms.
description: Published in April 2013 in Physical Review A
[Rezension zu] Perrey, Gudrun: Johann Georg Zimmer (1777–1853)
Creators: name: Lütjen, Andreas
Publisher: name: Stuttgart : Verein für Württembergische Kirchengeschichte
Year: 2018
Subjects: subject: Zimmer, Johann Georg 1777-1853
subject: Biographie
subject: Dewey Decimal Classification::200 | Religion, Religionsphilosophie

description: Rezension zu: Perrey, Gudrun: Johann Georg Zimmer (1777-1853). Die Geschichte des Heidelberger Verlegers (Texte und Beiträge zur Romantik und ihrer Wirkung, Bd. 2). Heidelberg: Universitätsverlag Winter, 2018, 323 S.
Electronic properties of Fabre charge-transfer salts under various temperature and pressure conditions
Creators: name: Jacko, A. C.
name: Feldner, H.
name: Rose, E.
name: Lissner, F.
name: Dressel, M.
name: Valentí, Roser
name: Jeschke, Harald O.
Publisher: name: arXiv
Year: 2013
Subjects: subject: Strongly Correlated Electrons (cond-mat.str-el)
subject: FOS: Physical sciences

description: Using density functional theory, we determine parameters of tight-binding Hamiltonians for a variety of Fabre charge transfer salts, focusing in particular on the effects of temperature and pressure. Besides relying on previously published crystal structures, we experimentally determine two new sets of structures; (TMTTF)$_2$SbF$_6$ at different temperatures and (TMTTF)$_2$PF$_6$ at various pressures. We find that a few trends in the electronic behavior can be connected to the complex phase diagram shown by these materials. Decreasing temperature and increasing pressure cause the systems to become more two-dimensional. We analyze the importance of correlations by considering an extended Hubbard model parameterized using Wannier orbital overlaps and show that while charge order is strongly activated by the inter-site Coulomb interaction, the magnetic order is only weakly enhanced. Both orders are suppressed when the effective pressure is increased.
description: 12 pages, 16 figures
Optimization of the parity-check matrix density in QC-LDPC code-based McEliece cryptosystems
Creators: name: Baldi, Marco
name: Bianchi, Marco
name: Chiaraluce, Franco
Publisher: name: arXiv
Year: 2013
Subjects: subject: Information Theory (cs.IT)
subject: Cryptography and Security (cs.CR)
subject: FOS: Computer and information sciences

description: Low-density parity-check (LDPC) codes are one of the most promising families of codes to replace the Goppa codes originally used in the McEliece cryptosystem. In fact, it has been shown that by using quasi-cyclic low-density parity-check (QC-LDPC) codes in this system, drastic reductions in the public key size can be achieved, while maintaining fixed security levels. Recently, some proposals have appeared in the literature using codes with denser parity-check matrices, named moderate-density parity-check (MDPC) codes. However, the density of the parity-check matrices to be used in QC-LDPC code-based variants of the McEliece cryptosystem has never been optimized. This paper aims at filling such gap, by proposing a procedure for selecting the density of the private parity-check matrix, based on the security level and the decryption complexity. We provide some examples of the system parameters obtained through the proposed technique.
description: 10 pages, 4 figures. To be presented at IEEE ICC 2013 - Workshop on Information Security over Noisy and Lossy Communication Systems. Copyright transferred to IEEE
Dual infrared limits of 6d N=(2,0)theory
Creators: name: Lechtenfeld, Olaf
name: Popov, Alexander D.
Publisher: name: Amsterdam : Elsevier B.V.
Year: 2019
Subjects: subject: Dewey Decimal Classification::500 | Naturwissenschaften::530 | Physik

description: Compactifying type A N−1 6d N=(2,0)supersymmetric CFT on a product manifold M 4 ×Σ 2 =M 3 ×S˜ 1 ×S 1 ×I either over S 1 or over S˜ 1 leads to maximally supersymmetric 5d gauge theories on M 4 ×I or on M 3 ×Σ 2 , respectively. Choosing the radii of S 1 and S˜ 1 inversely proportional to each other, these 5d gauge theories are dual to one another since their coupling constants e 2 and e˜ 2 are proportional to those radii respectively. We consider their non-Abelian but non-supersymmetric extensions, i.e. SU(N)Yang–Mills theories on M 4 ×I and on M 3 ×Σ 2 , where M 4 ⊃M 3 =R t ×T p 2 with time t and a punctured 2-torus, and I⊂Σ 2 is an interval. In the first case, shrinking I to a point reduces to Yang–Mills theory or to the Skyrme model on M 4 , depending on the method chosen for the low-energy reduction. In the second case, scaling down the metric on M 3 and employing the adiabatic method, we derive in the infrared limit a non-linear SU(N)sigma model with a baby-Skyrme-type term on Σ 2 , which can be reduced further to A N−1 Toda theory. © 2019 The Authors
Influence of non-Hermitian mode topology on refractive index sensing with plasmonic waveguides
Creators: name: Tuniz, Alessandro
name: Schmidt, Markus A.
name: Kuhlmey, Boris T.
Publisher: name: arXiv
Year: 2021
Subjects: subject: Optics (physics.optics)
subject: FOS: Physical sciences

description: We evaluate the sensing properties of plasmonic waveguide sensors by calculating their resonant transmission spectra in different regions of the non-Hermitian eigenmode space. We elucidate the pitfalls of using modal dispersion calculations in isolation to predict plasmonic sensor performance, which we address by using a simple model accounting for eigenmode excitation and propagation. Our transmission calculations show that resonant wavelength and spectral width crucially depend on the length of the sensing region, so that no single criterion obtained from modal dispersion calculations alone can be used as a proxy for sensitivity. Furthermore, we find that the optimal detection limits occur where directional coupling is supported, where the narrowest spectra occur. Such narrow spectral features can only be measured by filtering out all higher-order modes at the output, e.g., via a single-mode waveguide. Our calculations also confirm a characteristic square root dependence of the eigenmode splitting with respect to the permittivity perturbation at the exceptional point, which we show can be identified through the sensor beat length at resonance. This work provides a convenient framework for designing and characterizing plasmonic waveguide sensors when comparing with experimental measurements.
Pushing the button: Why do learners pause online videos?
Creators: name: Merkt, Martin
name: Hoppe, Anett
name: Bruns, Gerrit
name: Ewerth, Ralph
name: Huff, Markus
Publisher: name: Amsterdam [u.a.] : Elsevier Science
Year: 2022
Subjects: subject: Logfile analysis
subject: Online videos
subject: Pauses
subject: Video difficulty
subject: Video structure
subject: Behavioral data
subject: Educational videos
subject: Level of educations
subject: Log-file analysis
subject: Logfile
subject: Online video
subject: Pause
subject: Video structures
subject: Video-platforms
subject: Dewey Decimal Classification::000 | Allgemeines, Wissenschaft::000 | Informatik, Wissen, Systeme::004 | Informatik

description: With the recent surge in digitalization across all levels of education, online video platforms gained educational relevance. Therefore, optimizing such platforms in line with learners’ actual needs should be considered a priority for scientists and educators alike. In this project, we triangulate logfiles of a large German online video platform for educational videos with behavioral data from a laboratory study and the objective characteristics of the selected videos. We aim to understand the potential motives for why participants pause educational videos while watching such videos online. Our analyses revealed that perceived difficulties in comprehension and meaningful structural breakpoints in the videos were associated with increased pausing behavior. In contrast, pausing behavior was not associated with the videos’ formal structural features highlighted in the video platform. Implications of these findings and the potentials of our methodological approach for theory and practice are discussed. © 2021 The Authors
Phonon-induced spin-spin interactions in diamond nanostructures: application to spin squeezing
Creators: name: Bennett, S. D.
name: Yao, N. Y.
name: Otterbach, J.
name: Zoller, P.
name: Rabl, P.
name: Lukin, M. D.
Publisher: name: arXiv
Year: 2013
Subjects: subject: Mesoscale and Nanoscale Physics (cond-mat.mes-hall)
subject: Quantum Physics (quant-ph)
subject: FOS: Physical sciences

description: We propose and analyze a novel mechanism for long-range spin-spin interactions in diamond nanostructures. The interactions between electronic spins, associated with nitrogen-vacancy centers in diamond, are mediated by their coupling via strain to the vibrational mode of a diamond mechanical nanoresonator. This coupling results in phonon-mediated effective spin-spin interactions that can be used to generate squeezed states of a spin ensemble. We show that spin dephasing and relaxation can be largely suppressed, allowing for substantial spin squeezing under realistic experimental conditions. Our approach has implications for spin-ensemble magnetometry, as well as phonon-mediated quantum information processing with spin qubits.
description: 10 pages, 4 figures
A Modular 1D-CNN Architecture for Real-time Digital Pre-distortion
Creators: name: De Silva, Udara
name: Koike-Akino, Toshiaki
name: Ma, Rui
name: Yamashita, Ao
name: Nakamizo, Hideyuki
Publisher: name: arXiv
Year: 2021
Subjects: subject: Signal Processing (eess.SP)
subject: Machine Learning (cs.LG)
subject: FOS: Electrical engineering, electronic engineering, information engineering
subject: FOS: Computer and information sciences

description: This study reports a novel hardware-friendly modular architecture for implementing one dimensional convolutional neural network (1D-CNN) digital predistortion (DPD) technique to linearize RF power amplifier (PA) real-time.The modular nature of our design enables DPD system adaptation for variable resource and timing constraints.Our work also presents a co-simulation architecture to verify the DPD performance with an actual power amplifier hardware-in-the-loop.The experimental results with 100 MHz signals show that the proposed 1D-CNN obtains superior performance compared with other neural network architectures for real-time DPD application.
description: 3 pages, 4 figures, to be published in RWW2022
Novel approach to observing system simulation experiments improves information gain of surface-atmosphere field measurements
Creators: name: Metzger, Stefan
name: Durden, David
name: Paleri, Sreenath
name: Sühring, Matthias
name: Butterworth, Brian J.
name: Florian, Christopher
name: Mauder, Matthias
name: Plummer, David M.
name: Wanner, Luise
name: Xu, Ke
name: Desai, Ankur R.
Publisher: name: Katlenburg-Lindau : Copernicus
Year: 2021
Subjects: subject: aircraft
subject: eddy covariance
subject: emission inventory
subject: experimental study
subject: field method
subject: interdisciplinary approach
subject: observational method
subject: simulation
subject: Dewey Decimal Classification::500 | Naturwissenschaften::550 | Geowissenschaften

description: The observing system design of multidisciplinary field measurements involves a variety of considerations on logistics, safety, and science objectives. Typically, this is done based on investigator intuition and designs of prior field measurements. However, there is potential for considerable increases in efficiency, safety, and scientific success by integrating numerical simulations in the design process. Here, we present a novel numerical simulation-environmental response function (NS-ERF) approach to observing system simulation experiments that aids surface-atmosphere synthesis at the interface of mesoscale and microscale meteorology. In a case study we demonstrate application of the NS-ERF approach to optimize the Chequamegon Heterogeneous Ecosystem Energy-balance Study Enabled by a High-density Extensive Array of Detectors 2019 (CHEESEHEAD19). During CHEESEHEAD19 pre-field simulation experiments, we considered the placement of 20 eddy covariance flux towers, operations for 72h of low-altitude flux aircraft measurements, and integration of various remote sensing data products. A 2h high-resolution large eddy simulation created a cloud-free virtual atmosphere for surface and meteorological conditions characteristic of the field campaign domain and period. To explore two specific design hypotheses we super-sampled this virtual atmosphere as observed by 13 different yet simultaneous observing system designs consisting of virtual ground, airborne, and satellite observations. We then analyzed these virtual observations through ERFs to yield an optimal aircraft flight strategy for augmenting a stratified random flux tower network in combination with satellite retrievals. We demonstrate how the novel NS-ERF approach doubled CHEESEHEAD19's potential to explore energy balance closure and spatial patterning science objectives while substantially simplifying logistics. Owing to its modular extensibility, NS-ERF lends itself to optimizing observing system designs also for natural climate solutions, emission inventory validation, urban air quality, industry leak detection, and multi-species applications, among other use cases. © 2021 Stefan Metzger et al.
Acauloplacella Karny
Creators: name: Rentz, Dcf
name: Su, You Ning
name: Ueshima, Norihiro
Publisher: name: Zenodo
Year: 2010
Subjects: Biodiversity
Taxonomy
Animalia
Arthropoda
Insecta
Orthoptera
Phaneropteridae
Acauloplacella

description: Acauloplacella Karny
 Acauloplacella Karny. 1931. Treubia 12 (Suppl.):62.
 Type species: Acauloplax asiatica Brunner von Wattenwyl, by original designation.
 Two subgenera have been defined. The nominate subgenus, Acauloplacella, is the only one known to occur in Australia. Four species have been described (Eades and Otte 2010). They are known from Fiji, Sulawesi, Lombok, Lesser Sunda Islands, as well as New Guinea.
The species herein described are known from the rainforests of north tropical Queensland (Map 1). They are fairly common in understorey vegetation where their noisy chirping, cricket-like calls can be easily heard after dark. However, collecting them can be very difficult if on rocky ground or in tangles of vines.
description: Published as part of Rentz, Dcf, Su, You Ning & Ueshima, Norihiro, 2010, Studies in Australian Tettigoniidae: Australian Pseudophylline katydids (Tettigoniidae; Pseudophyllinae; Phyllomimini), pp. 1-20 in Zootaxa 2566 on page 3, DOI: 10.5281/zenodo.197256
Evidence of quiet Sun chromospheric activity related to an emerging small-scale magnetic loop
Creators: name: Gömöry, P.
name: Balthasar, H.
name: Puschmann, K. G.
Publisher: name: arXiv
Year: 2013
Subjects: subject: Solar and Stellar Astrophysics (astro-ph.SR)
subject: FOS: Physical sciences

description: Aims: We investigate the temporal evolution of magnetic flux emergence in the quiet Sun atmosphere close to disk center. Methods: We combine high-resolution SoHO/MDI magnetograms with TRACE observations taken in the 1216 Å channel in order to analyze the temporal evolution of an emerging small-scale magnetic loop and its traces in the chromosphere. Results: At first place, we find signatures of flux emergence very close to the edge of a supergranular network boundary located at disk center. The new emerging flux appears first in the MDI magnetograms in form of an asymmetric bipolar element, i.e. the patch with negative polarity is roughly two-times weaker than the corresponding patch with opposite polarity. The average values of magnetic flux and magnetic flux densities reach 1.6 x 10^18 Mx, -8.5 x 10^17 Mx, and 55 Mx cm^-2, -30 Mx cm^-2, respectively. The spatial distance between the opposite polarity patches of the emerged feature increases from about 2.5" to 5.0" during the lifetime of the loop which was not longer than 36 min. A more precise lifetime-estimate of the feature was not possible because of a gap in the temporal sequence of the MDI magnetograms. The chromospheric response to the emerged magnetic dipole occurs ~ 9 minutes later with respect to the photospheric magnetograms. It consists of a quasi-periodic sequence of time-localized brightenings visible in the 1216 Å TRACE channel apparent for ~ 14 minutes and being co-spatial with the axis connecting the two patches of opposite magnetic polarity. Conclusions: We identify the observed event as a small-scale magnetic loop emerging at photospheric layers and subsequently rising up to the chromosphere. We discuss the possibility that the fluctuations detected in the chromospheric emission probably reflect magnetic field oscillations which propagate to the chromosphere in form of waves.
description: 6 pages, 4 figures, 1 table, Astronomy and Astrophysics, in press
Nonradiating sources for efficient wireless power transfer
Creators: name: Zanganeh, Ezmaeel
name: Song, Mingzhao
name: Valero, Adrìa Canós
name: Shalin, Alexander S.
name: Nenasheva, Elizaveta
name: Miroshnichenko, Andrey
name: Evlyukhin, Andrey
name: Kapitanova, Polina
Publisher: name: Berlin : de Gruyter
Year: 2021
Subjects: subject: hybrid anapole state
subject: nonradiating source
subject: power transfer efficiency
subject: radiation loss
subject: wireless power transfer
subject: Inductive power transmission
subject: Nanophotonics
subject: Resonators
subject: Hybrid anapole state
subject: Near fields
subject: Power transfer systems
subject: Power transfers
subject: Radiation loss
subject: Sources of energy
subject: Wireless power
subject: Wireless power transfer
subject: Energy transfer
subject: Dewey Decimal Classification::500 | Naturwissenschaften::530 | Physik

description: Nonradiating sources of energy realized under a wave scattering on high-index dielectric nanoparticles have attracted a lot of attention in nano-optics and nanophotonics. They do not emit energy to the far-field, but simultaneously provides strong near-field energy confinement. Near-field wireless power transfer technologies suffer from low efficiency and short operation distance. The key factor to improve efficiency is to reduce the radiation loss of the resonators included in the transmitter and receiver. In this paper, we develop a wireless power transfer system based on nonradiating sources implemented using colossal permittivity dielectric disk resonator and a subwavelength metal loop. We demonstrate that this nonradiating nature is due to the hybrid anapole state originated by destructive interference of the fields generated by multipole moments of different parts of the nonradiating source, without a contribution of toroidal moments. We experimentally investigate a wireless power transfer system prototype and demonstrate that higher efficiency can be achieved when operating on the nonradiating hybrid anapole state compared to the systems operating on magnetic dipole and magnetic quadrupole modes due to the radiation loss suppression. © 2021 Esmaeel Zanganeh et al., published by De Gruyter, Berlin/Boston.
Simulating personal carbon trading (Pct) with an agent-based model (abm): Investigating adaptive reduction rates and path dependence
Creators: name: Kothe, Anna-Katharina
name: Kuptel, Alexander
name: Seidl, Roman
Publisher: name: Basel : MDPI AG
Year: 2021
Subjects: subject: Adaptive reduction rate (target)
subject: Agent-based model
subject: Computational approach
subject: Personal carbon trading
subject: Price
subject: Autonomous agents
subject: Carbon
subject: Carbon dioxide
subject: Costs
subject: Simulation platform
subject: Adaptive reduction
subject: Counterfactuals
subject: Modeling approach
subject: Path dependence
subject: Rate-dependence
subject: Reduction rate
subject: Computational methods
subject: Dewey Decimal Classification::600 | Technik::620 | Ingenieurwissenschaften und Maschinenbau

description: A decade after the publication of seminal papers on personal carbon trading (PCT), few empirical studies on its implementation exist. Investigating how to design, set up and implement a PCT scheme for a community or country raises several difficulties. For instance, it is unclear how to introduce a reduction rate of CO2 allowances to ensure a steady decrease in CO2 emissions from households. Computational approaches have been introduced to address these challenges of PCT by providing an opportunity to test counterfactual scenarios. Among the benefits of an agent-based modeling approach (ABM) is the potential to directly address dynamic developments and introduce counterfactual situations. In this paper, we review existing modeling approaches and present an ABM for PCT. With simulations of an artificial population of 1000 and 30,000 agents, we address questions on the price and reduction rate of allowances. A key contribution of our model is the inclusion of an adaptive reduction rate, which reduces the yearly allocated amount of allowances depending on a set CO2 abatement target. The results confirm that increased emissions targets are related to higher allowance prices and a higher proportion of buying households. Our analysis also suggests a significant path dependence in the dynamics of allowance prices and availability, but that adaptive reduction rates have little impact on outcomes other than the price. We discuss data availability and computational challenges to modeling a PCT scheme with an ABM. Ideal data to populate an ABM on PCT are not available due to the lack of real-world implementations of a PCT. Nonetheless, meaningful insights about the dynamics and the focal variables in a PCT scheme can be generated by the exploratory use of an ABM. © 2021 by the authors. Licensee MDPI, Basel, Switzerland.