cometadata/datacite-rtg-text-other-reclassification-records huggingface dataset:
Optically controlled phase gate and teleportation of a controlled-NOT gate for spin qubits in quantum dot-microcavity coupled system
Creators: name: Wang, Hong-Fu
name: Zhu, Ai-Dong
name: Zhang, Shou
name: Yeon, Kyu-Hwang
Publisher: name: arXiv
Year: 2013
Subjects: subject: Quantum Physics (quant-ph)
subject: FOS: Physical sciences

description: Assisted with linear optical manipulation, single photon, entangled photon pairs, photon measurement, and classical communication, a scheme for two-spin qubits phase gate and teleportation of a CNOT gate between two electron spins from acting on local qubits to acting on remote qubits using quantum dots in optical microcavities is proposed. The scheme is based on spin selective photon reflection from the cavity and is achieved in a deterministic way by the sequential detection of photons and the single-qubit rotations of a single electron spin in a self-assembled GaAs/InAs quantum dot. The feasibility of the scheme is assessed showing that high average fidelities of the gates are achievable in the weak-coupling regime when the side leakage and cavity loss are low. The scheme opens promising perspectives for long-distance quantum communication, distributed quantum computation, and constructing remote quantum information processing networks.
description: 14 pages, 5 figures, to appear in Physical Review A
Three-tangle for mixtures of generalized GHZ and generalized W states
Creators: name: Eltschka, C.
name: Osterloh, Andreas
name: Siewert, J.
name: Uhlmann, A.
Publisher: name: Bristol : IOP Publishing Ltd.
Year: 2008
Subjects: subject: entanglement
subject: Dewey Decimal Classification::500 | Naturwissenschaften::530 | Physik

description: We give a complete solution for the three-tangle of mixed three-qubit states composed of a generalized Greenberger-Horne-Zeilinger (GHZ) state, a vertical bar 000 > + b vertical bar 111 >, and a generalized W state, c vertical bar 001 > + d vertical bar 010 > + f vertical bar 100 >. Using the methods introduced by Lohmayer et al (2006 Phys. Rev. Lett. 97 260502), we provide explicit expressions for the mixed-state three-tangle and the corresponding optimal decompositions for this more general case. Moreover, as a special case, we obtain a general solution for a family of states consisting of a generalized GHZ state and an orthogonal product state.
Ranking Webometrics 2020
Creators: name: Moura, Rebeca S. F
Publisher: name: Zenodo
Year: 2022
Subjects: Webometrics
Ciência aberta
Direitos autorais

description: Classificação 100 Univesidades segundo Ranking Web of Universities (WEBOMETRICS) de 2020 Relação das universidades analisadas em pesquisa de doutorado de Rebeca Silva Fernandes de Moura entre os anos de 2020 e 2022.
Equalities and inequalities for Hermitian solutions and Hermitian definite solutions of the two matrix equations $AX = B$ and $AXA^* = B$
Creators: name: Tian, Yongge
Publisher: name: arXiv
Year: 2013
Subjects: subject: Rings and Algebras (math.RA)
subject: Operator Algebras (math.OA)
subject: FOS: Mathematics
subject: 15A03, 15A09, 15A24, 15B57

description: This paper studies algebraic properties of Hermitian solutions and Hermitian definite solutions of the two types of matrix equation $AX = B$ and $AXA^* = B$. We first establish a variety of rank and inertia formulas for calculating the maximal and minimal ranks and inertias of Hermitian solutions and Hermitian definite solutions of the matrix equations $AX = B$ and $AXA^* = B$, and then use them to characterize many qualities and inequalities for Hermitian solutions and Hermitian definite solutions of the two matrix equations and their variations.
description: 22 pages
Nitric oxide and cyclic nucleotide signalling during the development of the enteric nervous system of the grasshopper, Locusta migratoria L
Creators: name: Haase, Annely
Publisher: name: Hannover : Universität
Year: 2003
Subjects: subject: Nitric oxide/cyclic GMP
subject: signal transduction pathway
subject: neuronal migration
subject: Dewey Decimal Classification::500 | Naturwissenschaften::590 | Tiere (Zoologie)

description: [no abstract]
Minimal covariant observables identifying all pure states
Creators: name: Carmeli, Claudio
name: Heinosaari, Teiko
name: Toigo, Alessandro
Publisher: name: arXiv
Year: 2012
Subjects: subject: Quantum Physics (quant-ph)
subject: FOS: Physical sciences

description: It has been recently shown that an observable that identifies all pure states of a d-dimensional quantum system has minimally 4d-4 outcomes or slightly less (the exact number depending on the dimension d). However, no simple construction of this type of observable with minimal number of outcomes is known. In this work we investigate the possibility to have a covariant observable that identifies all pure states and has minimal number of outcomes for this purpose. It is shown that the existence of these kind of observables depends on the dimension of the Hilbert space. The fact that these kind of observables fail to exist in some dimensions indicates that the dual pair of observables -- pure states lacks the symmetry that the dual pair of observables -- states has.
Primula hirsuta
Creators: name: Becherer
Publisher: name: Zenodo
Year: 1956
Subjects: Biodiversity
Taxonomy

description: V. hirsuta (L.) S. F. Gray Cat. 79. 2: St-Leonard (Mercier). - 3: Les Valettes (Closuit); Charrat (idem); Stalden-Kalpetran (Becherer); Saastal: Staldenried (J.), Eisten (A. Keller), Matt-Balen (Becherer und Thommen), Grund (Becherer). Var. fissa (G. Frölich) Beck - 3: Zwischen Ahorn und Leidbach, östlich Eisten (Saastal), 1300 m (Hirschmann).
description: Published as part of Becherer, 1956, Florae Vallesiacae Supplementum, pp. 1-556 in Denkschriften der Schweizerischen Naturforschenden Gesellschaft 71 on pages 1-556
Nonequilibrium spin noise spectroscopy on single quantum dots
Creators: name: Wiegand, Julia Susan
Publisher: name: Hannover : Institutionelles Repositorium der Leibniz Universität Hannover
Year: 2019
Subjects: subject: laser spectroscopy
subject: quantum dot
subject: spin dynamics
subject: Laserspektroskopie
subject: Quantenpunkt
subject: Spindynamik
subject: Dewey Decimal Classification::500 | Naturwissenschaften::530 | Physik

description: All optical spin noise spectroscopy is typically used to extract the virtually undisturbed spin dynamics from measurements of spin fluctuations in thermal equilibrium. In this thesis, the method is applied to study spin fluctuations in single positively charged InGaAs quantum dots beyond thermal equilibrium conditions, in view of the spin-photon interface provided by the optical transition. Spin noise spectroscopy with a resonantly driven optical transition additionally reveals the spin dynamics in the optically excited state, enables the characterization of the optical transition, and unveils a charge occupation noise which is naturally inherent in optically driven semiconductor quantum dots. The spin noise measurements in combination with a theoretical model show that the average spin relaxation rate of the optically driven spin is a mixture of hole-spin relaxation in the ground state and electron-spin relaxation in the excited state. The electron-spin relaxation is found to be on the order of a few 10 MHz, and dominates the average spin relaxation rate under quasi-resonant excitation. The dependence of spin dynamics and noise power on the laser detuning is used to determine saturation intensity, line width, and inhomogeneous broadening of the optical transition. It is shown that the unfavorable inhomogeneous broadening due to charge fluctuations in the quantum dot environment becomes very small and can even be absent in high-quality samples with a very low quantum dot density. Beyond the spin relaxation, the spin noise under quasi-resonant driving furthermore contains an additional contribution which is assigned to the temporary escape of the resident hole in the quantum dot. The detailed analysis of this occupation noise shows that the hole escape is initiated by non-radiative Auger recombination. The subsequent reoccupation of the quantum dot depends crucially on the solid-state environment. The intrinsic Auger rate is determined to be about 2 to 3 MHz for holes in InGaAs quantum dots. The reoccupation of the quantum dot by a hole is in general found to be slow in the investigated weakly p-doped sample, i.e., on a timescale of a few microseconds. In particular, it is shown that the presence of an ionized acceptor in the close vicinity of the quantum dot can significantly prolong the reoccupation time to several tens of microseconds as the result of a hole-capture competition between ionized acceptor and quantum dot.
Expression and engineering of biosynthetic enzymes in fungi
Creators: name: Jin, Feng
Publisher: name: Hannover : Institutionelles Repositorium der Leibniz Universität Hannover
Year: 2021
Subjects: subject: Aspersillus oryzae
subject: heterologer Ausdruck
subject: DEBS1-TE
subject: Brasilan
subject: Biosynthese
subject: Dewey Decimal Classification::500 | Naturwissenschaften

description: Fungal heterologous expression is a powerful tool for the production of natural products. In this presented work, we aim to further expand the application of fungal heterologous systems. In addition to iterative PKS, extensively studied in the past, fungal hosts are also expected to be capable of expressing modular PKS, which have never been expressed in fungi. Thus, DEBS1-TE, a minimal bimodular PKS for the triketide 1 biosynthesis, was taken as a representative model system to conduct expression in Aspergillus oryzae in this work. In the re-engineered DEBS1-TE biosynthesis in A. oryzae, the supply pathways of propionate-related precursors were established. DEBS1-TE was codon-optimized and activated to be active in A. oryzae. With this engineered A. oryzae, the heterologous expression of a DEBS1-TE was functionally achieved to produce 1 (0.6 mg/L) in a filamentous fungal host for the first time. Then a set of titer optimizations of 1 was attempted, including fermentation conditions, overexpression of biosynthetic genes, and blockage of degradation pathways. It led to the 12-fold increase of the overall titer. Using the new A. oryzae system, we attempted to explore the possibility of fusion expression of modular and iterative PKSs. Unfortunately, there was no new product detectable. Another aim of this work was to identify the biosynthetic pathway of brasilane-type sesquiterpenes brasilane A 2, D 3, and E 4 by A. oryzae heterologous expression. The bra biosynthetic pathway, including a terpene cyclase (BraA), an N-acetylglucosamine transferase (BraB) and a cytochrome P450 monooxygenase (BraC), were identified. With the biochemical characterization of enzymes in vitro, BraB displayed a broad scope of acceptor substrates in vitro.
title: Vorträge und Forschungen: Sonderbände, Vol 14 (1974): Walter Müller: Entwicklung und Spätformen der Leibeigenschaft am Beispiel der Heiratsbeschränkungen
Creators: name: Vorträge Und Forschungen: Sonderbände
Publisher: name: University Library Heidelberg
Year: 2015

description: Die Ehegenoßsame im alemannisch-schweizerischen Raum
description: Die Ehegenoßsame im alemannisch-schweizerischen Raum
description: Entwicklung und Spätformen der Leibeigenschaft am Beispiel der Heiratsbeschränkungen. Die Ehegenoßsame im allemannisch-schweizerischen Raum
Composites and categories of euclidean Jordan algebras
Creators: name: Barnum, Howard
name: Graydon, Matthew A.
name: Wilce, Alexander
Publisher: name: Wien : Verein zur Förderung des Open Access Publizierens in den Quantenwissenschaften
Year: 2020
Subjects: subject: matrix algebra
subject: Jordan algebra
subject: EJAs
subject: Dewey Decimal Classification::500 | Naturwissenschaften::530 | Physik

description: We consider possible non-signaling composites of probabilistic models based on euclidean Jordan algebras (EJAs), satisfying some reasonable additional constraints motivated by the desire to construct dagger-compact categories of such models. We show that no such composite has the exceptional Jordan algebra as a direct summand, nor does any such composite exist if one factor has an exceptional summand, unless the other factor is a direct sum of one-dimensional Jordan algebras (representing essentially a classical system). Moreover, we show that any composite of simple, non-exceptional EJAs is a direct summand of their universal tensor product, sharply limiting the possibilities. These results warrant our focussing on concrete Jordan algebras of hermitian matrices, i.e., euclidean Jordan algebras with a preferred embedding in a complex matrix algebra. We show that these can be organized in a natural way as a symmetric monoidal category, albeit one that is not compact closed. We then construct a related category InvQM of embedded euclidean Jordan algebras, having fewer objects but more morphisms, that is not only compact closed but dagger-compact. This category unifies finite-dimensional real, complex and quaternionic mixed-state quantum mechanics, except that the composite of two complex quantum systems comes with an extra classical bit. Our notion of composite requires neither tomographic locality, nor preservation of purity under tensor product. The categories we construct include examples in which both of these conditions fail. In such cases, the information capacity (the maximum number of mutually distinguishable states) of a composite is greater than the product of the capacities of its constituents. © 2020 FahrenHouse. All rights reserved.
Statistics of multiple-scatterer induced frequency splitting in whispering gallery microresonators and microlasers
Creators: name: He, Lina
name: Ozdemir, Sahin Kaya
name: Zhu, Jiangang
name: Faraz, Monifi
name: Yilmaz, Huzeyfe
name: Yang, Lan
Publisher: name: arXiv
Year: 2013
Subjects: subject: Optics (physics.optics)
subject: Instrumentation and Detectors (physics.ins-det)
subject: FOS: Physical sciences

description: We investigate numerically and experimentally the statistics of the changes in the amount of frequency splitting upon the adsorption of particles one-by-one into the mode volume of whispering gallery mode (WGM) microresonator and microlasers. This multiple-particle induced frequency splitting (MPIFS) statistics carries information on the size and the number of adsorbed particles into the mode volume, and it is strongly affected by two experimental parameters, namely the WGM field distribution and the positions of the particles within the mode volume. We show that the standard deviation and maximum value of the MPIFS are proportional to the polarizability of the particles, and propose a method to estimate particle size from the MPIFS if the only available data from experiments is frequency splitting.
description: 16 pages, 13 figures, 42 references
title: Vorträge und Forschungen: Sonderbände, Vol 36 (1989): Theo Kölzer: Studien zu den Urkundenfälschungen des Klosters St. Maximin vor Trier
Creators: name: Vorträge Und Forschungen: Sonderbände
Publisher: name: University Library Heidelberg
Year: 2015

description: (10.-12. Jahrhundert)
description: (10.-12. Jahrhundert)
description: Studien zu den Urkundenfälschungen des Klosters St. Maximin vor Trier (10.-12. Jahrhundert)
Physical modelling of arctic coastlines-progress and limitations
Creators: name: Korte, Sophia
name: Gieschen, Rebekka
name: Stolle, Jacob
name: Goseberg, Nils
Publisher: name: Basel : MDPI AG
Year: 2020
Subjects: subject: Coastal erosion
subject: Erosion
subject: Experimental modelling
subject: Permafrost
subject: Climate change
subject: Coastal engineering
subject: Design parameters
subject: Further development
subject: Mechanical energies
subject: Observational study
subject: Permafrost modelling
subject: Physical modelling
subject: Process-based approach
subject: Thermo-mechanical
subject: abrasion
subject: climate change
subject: coastal engineering
subject: coastal erosion
subject: experimental study
subject: melting
subject: permafrost
subject: thermal power
subject: thermomechanics
subject: vulnerability
subject: Dewey Decimal Classification::600 | Technik::690 | Hausbau, Bauhandwerk

description: Permafrost coastlines represent a large portion of the world's coastal area and these areas have become increasingly vulnerable in the face of climate change. The predominant mechanism of coastal erosion in these areas has been identified through several observational studies as thermomechanical erosion-a joint removal of sediment through the melting of interstitial ice (thermal energy) and abrasion from incoming waves (mechanical energy). However, further developments are needed looking how common design parameters in coastal engineering (such as wave height, period, sediment size, etc.) contribute to the process. This paper presents the current state of the art with the objective of establishing the necessary research background to develop a process-based approach to predicting permafrost erosion. To that end, an overarching framework is presented that includes all major, erosion-relevant processes, while delineating means to accomplish permafrost modelling in experimental studies. Preliminary modelling of generations zero and one models, within this novel framework, was also performed to allow for early conclusions as to how well permafrost erosion can currently be modelled without more sophisticated setups. © 2020 by the authors.
Erosion resistance of vegetation-covered soils: Impact of different grazing conditions in salt marshes and analysis of soil-vegetation interactions by the novel DiCoastar method
Creators: name: Kosmalla, Viktoria
name: Keimer, Kara
name: Schürenkamp, David
name: Lojek, Oliver
name: Goseberg, Nils
Publisher: name: Amsterdam [u.a.] : Elsevier Science
Year: 2022
Subjects: subject: DiCoastar
subject: Erosion resistance
subject: Grazing
subject: Salt marsh
subject: Shear strength
subject: Soil-vegetation interactions
subject: Dewey Decimal Classification::600 | Technik::690 | Hausbau, Bauhandwerk

description: The analysis of soil-vegetation interactions in erosion processes along coastlines requires accurate information about various factors influencing the upper soil layer. Yet, some of these parameters were previously determined by simplified, often hand held devices, and these were often biased by the skill and experience of the operator. This study thus investigates the erosion resistance of salt marsh soils influenced by grazing conditions for providing crucial findings for policy making and land management decisions; to that end, we present and use a novel shear resistance measuring device. This measuring device, called DiCoastar, was developed with a controllable step-motor and now allows us for the first time the determination of time histories of shear resistance by repeatable in-situ measurements, gaining information about the interaction between soil and root systems. A field study was conducted in salt marshes at Cäciliengroden and at Sönke-Nissen-Koog, both foreland salt marshes at the German North Sea coast. The two sites had been chosen due to their difference in grazing intensities, featuring semi-natural/ungrazed, moderately grazed and intensively grazed salt marshes. This was to enable the investigation of influences on soil shear strength and vegetation cover. Measurements of shear resistance were conducted with the DiCoastar in the chosen sites in the vicinity of the dike toes; it is found that the new device now provides consistent and repeatable measurements, irrespective of the operator, and only based on the pre-set control parameters. Results of the field study demonstrate that a marked increase of shear strength is only found in sites with high intensity grazing, but this is accompanied by a strong reduction in the vegetation cover and plant diversity, especially with regard to the vertical density distribution of the vegetation cover. As the reduction in vegetation cover leads to reduced wave attenuation over salt marshes and increased flow velocities, an increased shear stress on the soil surface, which potentially exceeds the increased shear strength, is expected. Based on this, the results obtained lead to the assumption that an increase in the erosion potential of these foreland marshes by high grazing pressure is more likely as well as a reduction in dike stability. © 2022 The Authors
WarpDriver: context-aware probabilistic motion prediction for crowd simulation
Creators: name: Wolinski, David
name: Lin, Ming C.
name: Pettré, Julien
Publisher: name: The University of North Carolina at Chapel Hill University Libraries
Year: 2016

description: Microscopic crowd simulators rely on models of local interaction (e.g. collision avoidance) to synthesize the individual motion of each virtual agent. The quality of the resulting motions heavily depends on this component, which has significantly improved in the past few years. Recent advances have been in particular due to the introduction of a short-horizon motion prediction strategy that enables anticipated motion adaptation during local interactions among agents. However, the simplicity of prediction techniques of existing models somewhat limits their domain of validity. In this paper, our key objective is to significantly improve the quality of simulations by expanding the applicable range of motion predictions. To this end, we present a novel local interaction algorithm with a new context-aware, probabilistic motion prediction model. By context-aware, we mean that this approach allows crowd simulators to account for many factors, such as the influence of environment layouts or in-progress interactions among agents, and has the ability to simultaneously maintain several possible alternate scenarios for future motions and to cope with uncertainties on sensing and other agent's motions. Technically, this model introduces "collision probability fields" between agents, efficiently computed through the cumulative application of Warp Operators on a source Intrinsic Field. We demonstrate how this model significantly improves the quality of simulated motions in challenging scenarios, such as dense crowds and complex environments.
title: Vorträge und Forschungen: Sonderbände, Vol 37 (1989): Manfred Hellmann (Hg.): Studien über die Anfänge der Mission in Livland
Creators: name: Vorträge Und Forschungen: Sonderbände
Publisher: name: University Library Heidelberg
Year: 2015

description: Titel / Impressum
 Inhaltsverzeichnis
 Die Anfänge christlicher Mission in den baltischen Ländern. Anhang: Bernd Ulrich Hucker, die Herkunft des Livenapostels Meinhard...7-38
 Der Zisterzienserabt Bertold, Bischof von Livland, und der erste Livlandkreuzzug...39-64
 Liv- und estländische Königspläne?...65-106
 Straßentheater im Missionseinsatz. Zu Heinrichs von Lettland Bericht über ein großes Spiel in Riga 1205...107-121
 Die Anfänge der Sakraltopographie von Riga...123-158
 Orts- und Personenregister (angefertigt von Helmut Grein)...159-167
 Verlagsinformationen
EUV induced defects on few-layer graphene
Creators: name: Gao, A.
name: Rizo, P. J.
name: Zoethout, E.
name: Scaccabarozzi, L.
name: Lee, C. J.
name: Banine, V.
name: Bijkerk, F.
Publisher: name: arXiv
Year: 2013
Subjects: subject: Materials Science (cond-mat.mtrl-sci)
subject: Chemical Physics (physics.chem-ph)
subject: FOS: Physical sciences

description: We use Raman spectroscopy to show that exposing few-layer graphene to extreme ultraviolet (EUV, 13.5 nm) radiation, i.e. relatively low photon energy, results in an increasing density of defects. Furthermore, exposure to EUV radiation in a H2 background increases the graphene dosage sensitivity, due to reactions caused by the EUV induced hydrogen plasma. X-ray photoelectron spectroscopy (XPS) results show that the sp2 bonded carbon fraction decreases while the sp3 bonded carbon and oxide fraction increases with exposure dose. Our experimental results confirm that even in reducing environment oxidation is still one of the main source of inducing defects.
description: 5 pages 4 figures
Non-classical state engineering for quantum networks
Creators: name: Vollmer, Christina E.
Publisher: name: Hannover : Gottfried Wilhelm Leibniz Universität Hannover
Year: 2014
Subjects: subject: Quantum networks
subject: entanglement
subject: squeezed states
subject: frequency conversion
subject: Quantennetzwerke
subject: Verschränkung
subject: gequetschte Zustände
subject: Frequenzkonversion
subject: Dewey Decimal Classification::500 | Naturwissenschaften::530 | Physik

description: [no abstract]
Bounds for the Betti numbers of successive stellar subdivisions of a simplex
Creators: name: Boehm, Janko
name: Papadakis, Stavros Argyrios
Publisher: name: arXiv
Year: 2012
Subjects: subject: Commutative Algebra (math.AC)
subject: Combinatorics (math.CO)
subject: FOS: Mathematics
subject: 13F55 (Primary) 13D02, 13P20, 13H10 (Secondary)

description: We give a bound for the Betti numbers of the Stanley-Reisner ring of a stellar subdivision of a Gorenstein* simplicial complex by applying unprojection theory. From this we derive a bound for the Betti numbers of iterated stellar subdivisions of the boundary complex of a simplex. The bound depends only on the number of subdivisions, and we construct examples which prove that it is sharp.
description: 15 pages, no figures. Package may be downloaded at http://www.mathematik.uni-kl.de/~boehm/Macaulay2/BettiBounds/html/
Beiträge zur Optimierung polymerer Referenzmaterialien
Creators: name: Schubert, Julia Victoria
Publisher: name: Hannover : Institutionelles Repositorium der Leibniz Universität Hannover
Year: 2020
Subjects: subject: reference material
subject: polymer matrix
subject: solid state spectroscopy
subject: layer thickness determination
subject: surface modification
subject: UV-VIS spectroscopy
subject: Referenzmaterial
subject: polymere Matrix
subject: Festkörperspektroskopie
subject: µRFA
subject: Schichtdickenbestimmung
subject: Oberflächenmodifizierung
subject: UV-VIS-Spektroskopie
subject: Dewey Decimal Classification::500 | Naturwissenschaften::540 | Chemie

description: In der analytischen Chemie gehören Referenzmaterialien zu einem unverzichtbaren Mittel bei einer Vielzahl unterschiedlicher Fragestellungen. Sie werden als Standards zur Quantifizierung, für die Methodenentwicklung und -validierung sowie im Rahmen der täglichen Qualitätskontrolle eingesetzt. Ein stetig wachsender Bereich ist die ortsaufgelöste, festkörperspektroskopische Analyse von Proben mit einer leichten organischen Matrix z.B. biologische Proben, mittels zerstörungsfreier bzw. quasi-zerstörungsfreier Methoden. Da die Matrix einen entscheidenden Ein-fluss auf das Analyseergebnis hat, müssen matrixangepasste Standards für die Quantifizierung verwendet werden, deren Verfügbarkeit jedoch begrenzt ist. Aufgrund des hohen Bedarfs, beschäftigt sich diese Arbeit mit verschiedenen Bereichen, die für eine erfolgreiche Präparation sowie Charakterisierung polymerer Referenzmaterialien notwendig sind. Voraussetzung bei der Entwicklung neuer Referenzmaterialien ist eine gründliche Charakterisierung verschiedener Parameter, wie z.B. der Analytgehalt und -spezies, oder die Schichtdicke, sowie der homogenen Verteilung des Füllstoffes in der gewählten Matrix. In der vorliegenden Arbeit wurde für die Optimierung der Schichtdickenbestimmung ein organischer Fluoreszenzfarbstoff eingesetzt, durch den eine UV-VIS-Methode zur Schichtdicken-bestimmung erprobt werden konnte. Des Weiteren wurden unterschiedliche nanopartikuläre Füllstoffe, TiO2, Al2O3, Fe2O3, sowie oberflächenmodifizierte Partikel in einem Gehaltsbereich von 1 Gew% - 10 Gew% in die Mat-rix eingebracht und als Schichtsystem appliziert. Die jeweilige Präparation wurde hierbei für den jeweiligen Analyten optimiert bzw. entwickelt. Die präparierten Schichten bzw. polymeren Mischungen wurden mittels diverser Analyseverfahren, ICP-OES, REM-EDX, LA-ICP-MS, µRFA und der Lichtmikroskopie hinsichtlich ihres Elementgehaltes, der realen Schichtdicke sowie der Elementverteilung innerhalb der Schicht analysiert. Durch Auswertung der ortsaufgelösten Messungen war es möglich unterschiedliche Präparationsverfahren, verschiedene Additive, sowie Oberflächenmodifikationen zu analysieren, zu bewerten und zu optimieren.
Sum index, difference index and exclusive sum number of graphs
Creators: name: Haslegrave, John
Publisher: name: arXiv
Year: 2021
Subjects: subject: Combinatorics (math.CO)
subject: FOS: Mathematics
subject: 05C78, 05C35

description: We consider two recent conjectures of Harrington, Henninger-Voss, Karhadkar, Robinson and Wong concerning relationships between the sum index, difference index and exclusive sum number of graphs. One conjecture posits an exact relationship between the first two invariants; we show that in fact the predicted value may be arbitrarily far from the truth in either direction. In the process we establish some new bounds on both the sum and difference index. The other conjecture, that the exclusive sum number can exceed the sum index by an arbitrarily large amount, follows from known, but non-constructive, results; we give an explicit construction demonstrating it. Simultaneously with the first version of this paper appearing, Harrington et al. updated their preprint with two counterexamples to the first conjecture; however, their counterexamples only give a discrepancy of 1, and only in one direction. They therefore modified the conjecture from an equality to an inequality; our results show that this is still false in general.
description: 10 pages, 3 figures. Final version, to appear in Graphs and Combinatorics
Mechanical frequency control in inductively coupled electromechanical systems
Creators: name: Luschmann, Thomas
name: Schmidt, Philip
name: Deppe, Frank
name: Marx, Achim
name: Sanchez, Alvaro
name: Gross, Rudolf
name: Huebl, Hans
Publisher: name: arXiv
Year: 2021
Subjects: subject: Quantum Physics (quant-ph)
subject: FOS: Physical sciences

description: Nano-electromechanical systems implement the opto-mechanical interaction combining electromagnetic circuits and mechanical elements. We investigate an inductively coupled nano-electromechanical system, where a superconducting quantum interference device (SQUID) realizes the coupling. We show that the resonance frequency of the mechanically compliant string embedded into the SQUID loop can be controlled in two different ways: (i) the bias magnetic flux applied perpendicular to the SQUID loop, (ii) the magnitude of the in-plane bias magnetic field contributing to the nano-electromechanical coupling. These findings are quantitatively explained by the inductive interaction contributing to the effective spring constant of the mechanical resonator. In addition, we observe a residual field dependent shift of the mechanical resonance frequency, which we attribute to the finite flux pinning of vortices trapped in the magnetic field biased nanostring.
description: 5 pages, 3 figures
Numerical modelling of classical and quantum effects in non-linear optical systems
Creators: name: Lastzka, Nico
Publisher: name: Hannover : Gottfried Wilhelm Leibniz Universität Hannover
Year: 2010
Subjects: subject: Non-linear cavities
subject: absorption measurement
subject: numerical simulation
subject: Nichtlineare Resonatoren
subject: Absorptionsmessung
subject: numerische Simulation
subject: Dewey Decimal Classification::500 | Naturwissenschaften::530 | Physik

description: [no abstract]
The antecedents and consequences of the Corporate Social Responsibility (CSR) disclosure-action portrayal gap
Creators: name: Moses, April
Publisher: name: Macquarie University
Year: 2022
Subjects: Other education not elsewhere classified

description: This study aims to examine the antecedents and consequences of the Corporate Social Responsibility (CSR) disclosure-action portrayal gap, which represents the disparity between the extent of CSR disclosures and actual organisational effort in respect to CSR, as perceived by lower level managers. Specifically, this study examines the association between stakeholder pressure, public image, and the use of interactive and diagnostic controls with the CSR disclosure-action portrayal gap, and examines the associations between the CSR disclosure-action portrayal gap and three employee work-related attitudes: job satisfaction, employee organisational commitment, and the propensity to remain. The results reveal that while stakeholder pressures and public image exhibited a positive association with the CSR disclosure-action portrayal gap, the use of interactive and diagnostic controls exhibited a negative association with the gap. Furthermore, specific dimensions of the CSR disclosure action portrayal gap exhibited a negative association with all three employee work-related attitudes. This finding was further supported by a separate analysis which revealed that job satisfaction, employee organisational commitment and the propensity to remain were all significantly less when organisations clearly engaged in impression management i.e. the extent of CSR disclosures exceeded actual CSR activities. Overall, the study provides managers with an insight into the factors that mitigate or exacerbate the CSR disclosure-action portrayal gap, and the detrimental effect of the gap on employees.
Graphene plasmonics
Creators: name: Grigorenko, A. N.
name: Polini, Marco
name: Novoselov, K. S.
Publisher: name: arXiv
Year: 2013
Subjects: subject: Mesoscale and Nanoscale Physics (cond-mat.mes-hall)
subject: FOS: Physical sciences

description: Two rich and vibrant fields of investigation, graphene physics and plasmonics, strongly overlap. Not only does graphene possess intrinsic plasmons that are tunable and adjustable, but a combination of graphene with noble-metal nanostructures promises a variety of exciting applications for conventional plasmonics. The versatility of graphene means that graphene-based plasmonics may enable the manufacture of novel optical devices working in different frequency ranges, from terahertz to the visible, with extremely high speed, low driving voltage, low power consumption and compact sizes. Here we review the field emerging at the intersection of graphene physics and plasmonics.
description: Review article; 12 pages, 6 figures, 99 references (final version available only at publisher's web site)
Myosotis silvatica L.
Creators: name: Becherer
Publisher: name: Zenodo
Year: 1956
Subjects: Biodiversity
Taxonomy

description: V. silvatica L. Cat. 79. l: Lovenex-Grammont (Briquet); obMiex (F.); ob Vionnaz (J.); St-Maurice (Marietan); Gueu- roz (F.); LaTaillat (Oberson, Favarger); ob Alesse (Closuit). - 3: Ob Fionnay, mehrfach, 1600 bis 1700 m (Zwicky); Mont-Chemin ob Le Guercet (F., Closuit); La Vuardaz ob Riddes (Besse). Var.subalpina Garns - l: Grammont (nachGarns).
description: Published as part of Becherer, 1956, Florae Vallesiacae Supplementum, pp. 1-556 in Denkschriften der Schweizerischen Naturforschenden Gesellschaft 71 on pages 1-556
Putting the Precision in Precision Cosmology: How accurate should your data covariance matrix be?
Creators: name: Taylor, Andy
name: Joachimi, Benjamin
name: Kitching, Thomas
Publisher: name: arXiv
Year: 2012
Subjects: subject: Cosmology and Nongalactic Astrophysics (astro-ph.CO)
subject: FOS: Physical sciences

description: Cosmological parameter estimation requires that the likelihood function of the data is accurately known. Assuming that cosmological large-scale structure power spectra data are multivariate Gaussian-distributed, we show the accuracy of parameter estimation is limited by the accuracy of the inverse data covariance matrix - the precision matrix. If the data covariance and precision matrices are estimated by sampling independent realisations of the data, their statistical properties are described by the Wishart and Inverse-Wishart distributions, respectively. Independent of any details of the survey, we show that the fractional error on a parameter variance, or a Figure-of-Merit, is equal to the fractional variance of the precision matrix. In addition, for the only unbiased estimator of the precision matrix, we find that the fractional accuracy of the parameter error depends only on the difference between the number of independent realisations and the number of data points, and so can easily diverge. For a 5% error on a parameter error and N_D << 100 data-points, a minimum of 200 realisations of the survey are needed, with 10% accuracy for the data covariance. If the number of data-points N_D >>100 we need N_S > N_D realisations and a fractional accuracy of 10^4 -10^6 this approach will be problematic. We discuss possible ways to relax these conditions: improved theoretical modelling; shrinkage methods; data-compression; simulation and data resampling methods.
description: 21 pages, 10 figures, submitted to MNRAS
Numerical simulation of binary black hole spacetimes and a novel approach to outer boundary conditions
Creators: name: Seiler, Jennifer
Publisher: name: Hannover : Gottfried Wilhelm Leibniz Universität Hannover
Year: 2010
Subjects: subject: Boundary conditions
subject: binary black holes
subject: numerical relativity
subject: Randbedingungen
subject: Schwarzlochverschmelzungen
subject: numerische Relativität
subject: Dewey Decimal Classification::500 | Naturwissenschaften::530 | Physik

description: [no abstract]
Origins of large enhancement in electromechanical coupling for nonpolar directions in ferroelectric BaTiO3
Creators: name: Pramanick, A.
name: Diallo, S. O.
name: Delaire, O.
name: Calder, S.
name: Christianson, A. D.
name: Wang, X. -L.
name: Fernandez-Baca, J. A.
Publisher: name: arXiv
Year: 2013
Subjects: subject: Materials Science (cond-mat.mtrl-sci)
subject: FOS: Physical sciences

description: The origins of enhanced piezoelectric coupling along nonpolar crystallographic directions in ferroelectric BaTiO3 are investigated using in situ neutron spectroscopy. It is observed that an electric field applied away from the equilibrium polarization direction causes changes in the phonon spectra that lead to an increase in the interaction between the transverse acoustic and transverse optic branches (TA-TO) near the Brillouin zone center. This provides a direct lattice dynamics mechanism for enhanced electromechanical coupling, and could act as a guide for designing improved piezoelectric materials.
description: 16 pages, 4 figures
Representatives for unipotent classes and nilpotent orbits
Creators: name: Korhonen, Mikko
name: Stewart, David I.
name: Thomas, Adam R.
Publisher: name: arXiv
Year: 2021
Subjects: subject: Group Theory (math.GR)
subject: Representation Theory (math.RT)
subject: FOS: Mathematics
subject: 17B45, 20G99

description: Let $G$ be a simple algebraic group over an algebraically closed field $k$ of characteristic $p$. The classification of the conjugacy classes of unipotent elements of $G(k)$ and nilpotent orbits of $G$ on $\operatorname{Lie}(G)$ is well-established. One knows there are representatives of every unipotent class as a product of root group elements and every nilpotent orbit as a sum of root elements. We give explicit representatives in terms of a Chevalley basis for the eminent classes. A unipotent (resp. nilpotent) element is said to be eminent if it is not contained in any subsystem subgroup (resp. subalgebra), or a natural generalisation if $G$ is of type $D_n$. From these representatives, it is straightforward to generate representatives for any given class. Along the way we also prove recognition theorems for identifying both the unipotent classes and nilpotent orbits of exceptional algebraic groups.
description: 26 pages
HST/COS Spectra of Three QSOs That Probe The Circumgalactic Medium of a Single Spiral Galaxy: Evidence for Gas Recycling and Outflow
Creators: name: Keeney, Brian A.
name: Stocke, John T.
name: Rosenberg, Jessica L.
name: Danforth, Charles W.
name: Ryan-Weber, Emma V.
name: Shull, J. Michael
name: Savage, Blair D.
name: Green, James C.
Publisher: name: arXiv
Year: 2013
Subjects: subject: Cosmology and Nongalactic Astrophysics (astro-ph.CO)
subject: FOS: Physical sciences

description: We have used the Cosmic Origins Spectrograph (COS) to obtain far-UV spectra of three closely-spaced QSO sight lines that probe the circumgalactic medium (CGM) of an edge-on spiral galaxy, ESO 157-49, at impact parameters of 74 and 93 kpc near its major axis and 172 kpc along its minor axis. H I Lyα absorption is detected at the galaxy redshift in the spectra of all three QSOs, and metal lines of Si III, Si IV, and C IV are detected along the two major-axis sight lines. Photoionization models of these clouds suggest metallicities close to the galaxy metallicity, cloud sizes of ~1 kpc, and gas masses of ~10^4 solar masses. Given the high covering factor of these clouds, ESO 157-49 could harbor ~2x10^9 solar masses of warm CGM gas. We detect no metals in the sight line that probes the galaxy along its minor axis, but gas at the galaxy metallicity would not have detectable metal absorption with ionization conditions similar to the major-axis clouds. The kinematics of the major-axis clouds favor these being portions of a "galactic fountain" of recycled gas, while two of the three minor-axis clouds are constrained geometrically to be outflowing gas. In addition, one of our QSO sight lines probes a second more distant spiral, ESO 157-50, along its major axis at an impact parameter of 88 kpc. Strong H I Lyα and C IV absorption only are detected in the QSO spectrum at the redshift of ESO 157-50.
description: 19 pages, 10 figures, 5 tables; accepted for publication in ApJ
Novel P-stereogenic bidentate phosphorus ligands for asymmetric catalysis
Creators: name: Vinokurov, Nikolai
Publisher: name: Hannover : Gottfried Wilhelm Leibniz Universität Hannover
Year: 2007
Subjects: subject: P-chiral vinylphosphine oxides
subject: homodimerization
subject: alkene metathesis
subject: ruthenium
subject: asymmetric cycloaddition
subject: P-stereogenic diphosphines
subject: asymmetric catalysis
subject: rhodium
subject: Dewey Decimal Classification::500 | Naturwissenschaften::540 | Chemie

description: [no abstract]
title: Spiel mit Ziel
Creators: name: Resch, Alexandra
name: Heimbuch, Erik
Publisher: name: Gesellschaft für Informatik
Year: 2023
Subjects: subject: Serious Games||Interview

description: Zusammen mit ihrer Co-Gründerin Jennifer Stark haben Michelle Martinussen und Lara Wietschorke direkt nach dem Informatikstudium ein Start-up gegründet, um ihr erstes Serious Game zu veröffentlichen. Im Gespräch mit ihrem ehemaligen Dozenten Dr. Stefan Göbel, Experte für Serious Games an der TU Darmstadt, lassen sie den Weg dahin Revue passieren - und diskutieren über die Herausforderungen, vor denen die Branche steht.
Lehramt und Migration im Spannungsfeld gesellschaftlichen Wandels : eine Studie zur sozialen Konstruktion ethnischer Differenz durch Lehramtsstudierende
Creators: name: Akbas-Jenisch, Levent
Publisher: name: Hannover : Institutionelles Repositorium der Leibniz Universität Hannover
Year: 2020
Subjects: subject: Lehramt
subject: Migrationshintergrund
subject: ethnische Stereotype
subject: Dewey Decimal Classification::300 | Sozialwissenschaften, Soziologie, Anthropologie::370 | Erziehung, Schul- und Bildungswesen

description: Die Studie befasst sich mit sozialen Konstruktionen ethnischer Differenz durch Lehramtsstudierende, welche anhand von Gruppendiskussionen zur Thematik Unterrichtsstörung erfasst und mittels der Dokumentarischen Methode von Bohnsack (2014) analysiert wurden. Im Ergebnis konstruierten die Lehramtsstudierenden eine von ihren Normalitätsvorstellungen negativ abweichende ethnische Differenz bzgl. Schülerinnen und Schülern mit Migrationshintergrund und begründeten vermutete Unterschiede mittels ethnischer Stereotype, wobei auch eine bewusste Artikulation der Nutzung ethnischer Stereotype identifiziert werden konnte, der Versuche der Abwehr in Form der Diskussion nicht-stereotypisierender Vorstellungen folgten. Jedoch stellen Konstruktionen ethnischer Differenz einen wirkmächtigen Attraktor dar, welcher in der Konsequenz zu einer Präferenz stereotypisierender Vorstellungen der Lehramtsstudierenden führte. Der Umgang mit der Unterrichtsstörung selbst orientierte sich hingegen nicht an ethnischen Differenzkonstruktionen.
Contributions to Discrete Mathematics, Vol. 17 No. 2 (2022)
Creators: name: Contributions To Discrete Mathematics
Publisher: name: Contributions to Discrete Mathematics
Year: 2022

description: Heesch numbers of unmarked polyforms...150-171 The simplicity index of tournaments...172-186 Some notes on generic rectangulations...41-66 Coverings with congruent and non-congruent hyperballs generated by doubly truncated Coxeter orthoschemes...23-40 Refining overpartitions by properties of non-overlined parts...96-111 Designs for graphs with six vertices and ten edges - II...112-136 On $D_{\alpha}$ spectrum of connected graphs...77-95 On uniformly resolvable $(C_4,K_{1,3})$-designs...1-22 Hamilton cycles in bidirected complete graphs...137-149 Brooks' theorem for 2-fold coloring...67-76
Progress in organic single-crystal field-effect transistors
Creators: name: Lezama, Ignacio Gutiérrez
name: Morpurgo, Alberto F.
Publisher: name: arXiv
Year: 2013
Subjects: subject: Materials Science (cond-mat.mtrl-sci)
subject: FOS: Physical sciences

description: Research on organic thin-film transistors tends to focus on improvements in device performance, but very little is understood about the ultimate limits of these devices, the microscopic physical mechanisms responsible for their limitations, and, more generally, the intrinsic transport properties of organic semiconductors. These topics are now being investigated through the study of transport in organic transistors realized using molecular single crystals of unprecedented chemical purity and structural quality. These studies are elucidating detailed microscopic aspects of the physics of organic semiconductors and corresponding devices and have also led to unforeseen high values for carrier mobility in these materials. Here, we discuss developments in this area and present a brief outlook on future goals that have now come into experimental reach.
description: 18 pages, 4 Figures
The Spatial Extent and Distribution of Star Formation in 3D-HST Mergers at z~1.5
Creators: name: Schmidt, Kasper B.
name: Rix, Hans-Walter
name: da Cunha, Elisabete
name: Brammer, Gabriel B.
name: Cox, Thomas J.
name: van Dokkum, Pieter
name: Schreiber, Natascha M. Förster
name: Franx, Marijn
name: Fumagalli, Mattia
name: Jonsson, Patrik
name: Lundgren, Britt
name: Maseda, Michael V.
name: Momcheva, Ivelina
name: Nelson, Erica J.
name: Skelton, Rosalind E.
name: van der Wel, Arjen
name: Whitaker, Katherine E.
Publisher: name: arXiv
Year: 2013
Subjects: subject: Cosmology and Nongalactic Astrophysics (astro-ph.CO)
subject: FOS: Physical sciences

description: We present an analysis of the spatial distribution of star formation in a sample of 60 visually identified galaxy merger candidates at z>1. Our sample, drawn from the 3D-HST survey, is flux-limited and was selected to have high star formation rates based on fits of their broad-band, low spatial resolution spectral energy distributions. It includes plausible pre-merger (close pairs) and post-merger (single objects with tidal features) systems, with total stellar masses and star formation rates derived from multi-wavelength photometry. Here we use near-infrared slitless spectra from 3D-HST which produce Halpha or [OIII] emission line maps as proxies for star-formation maps. This provides a first comprehensive high-resolution, empirical picture of where star formation occurred in galaxy mergers at the epoch of peak cosmic star formation rate. We find that detectable star formation can occur in one or both galaxy centres, or in tidal tails. The most common case (58%) is that star formation is largely concentrated in a single, compact region, coincident with the centre of (one of) the merger components. No correlations between star formation morphology and redshift, total stellar mass, or star formation rate are found. A restricted set of hydrodynamical merger simulations between similarly massive and gas-rich objects implies that star formation should be detectable in both merger components, when the gas fractions of the individual components are the same. This suggests that z~1.5 mergers typically occur between galaxies whose gas fractions, masses, and/or star formation rates are distinctly different from one another.
description: Accepted for publication in MNRAS, 16 pages, 10 figures