cometadata/datacite-rtg-text-other-reclassification-records huggingface dataset:
Rashba diamond in an Aharonov-Casher ring
Creators: name: Wang, Xuhui
name: Manchon, Aurelien
Publisher: name: arXiv
Year: 2011
Subjects: subject: Mesoscale and Nanoscale Physics (cond-mat.mes-hall)
subject: FOS: Physical sciences

description: Spin interference due to Rashba spin-orbit interaction (SOI) in a ballistic two-dimensional electron gas (2DEG) ring conductor submitted to a bias voltage is investigated theoretically. We calculate the scattering matrices and differential conductance with lead-ring junction coupling as an adjustable parameter. Due to the interference of electronic waves traversing the ring, the differential conductance modulated by both bias voltage and SOI exhibits a diamond-shaped pattern, thus termed as \ti{Rashba diamond}. This feature offers a supplementary degree of freedom to manipulate phase interference.
description: 4 pages, 3 figures
Neuauswertung der Untersuchungen von Engels, Gebers und Matthias an geschleppten Platten und Prismen
Creators: name: Fritzsche, Elmar
name: Thieme, Hans
Publisher: name: TUHH Universitätsbibliothek
Year: 1958
Subjects: classificationCode: 52.00
subject: Maschinenbau, Energietechnik, Fertigungstechnik: Allgemeines

description: Neuauswertung der Untersuchungen von Engels, Gebers und Matthias an geschleppten Platten und Prismen
Surface Roughness Dominated Pinning Mechanism of Magnetic Vortices in Soft Ferromagnetic Films
Creators: name: Chen, Te-Yu
name: Erickson, Michael J.
name: Leighton, Chris
name: Crowell, Paul A.
Publisher: name: arXiv
Year: 2012
Subjects: subject: Materials Science (cond-mat.mtrl-sci)
subject: FOS: Physical sciences

description: Although pinning of domain walls in ferromagnets is ubiquitous, the absence of an appropriate characterization tool has limited the ability to correlate the physical and magnetic microstructures of ferromagnetic films with specific pinning mechanisms. Here, we show that the pinning of a magnetic vortex, the simplest possible domain structure in soft ferromagnets, is strongly correlated with surface roughness, and we make a quantitative comparison of the pinning energy and spatial range in films of various thickness. The results demonstrate that thickness fluctuations on the lateral length scale of the vortex core diameter, i.e. an effective roughness at a specific length scale, provides the dominant pinning mechanism. We argue that this mechanism will be important in virtually any soft ferromagnetic film.
description: 4 figures
PTF1 J071912.13+485834.0: An outbursting AM CVn system discovered by a synoptic survey
Creators: name: Levitan, David
name: Fulton, Benjamin J.
name: Groot, Paul J.
name: Kulkarni, Shrinivas R.
name: Ofek, Eran O.
name: Prince, Thomas A.
name: Shporer, Avi
name: Bloom, Joshua S.
name: Cenko, S. Bradley
name: Kasliwal, Mansi M.
name: Law, Nicholas M.
name: Nugent, Peter E.
name: Poznanski, Dovi
name: Quimby, Robert M.
name: Horesh, Assaf
name: Sesar, Branimir
name: Sternberg, Assaf
Publisher: name: arXiv
Year: 2011
Subjects: subject: Solar and Stellar Astrophysics (astro-ph.SR)
subject: FOS: Physical sciences

description: We present extensive photometric and spectroscopic observations of PTF1 J071912.13+485834.0, an outbursting AM CVn system discovered by the Palomar Transient Factory (PTF). AM CVn systems are stellar binaries with some of the smallest separations known and orbital periods ranging from 5 to 65 minutes. They are believed to be composed of a white dwarf accretor and a (semi)-degenerate He-rich donor and are considered to be the helium equivalents of Cataclysmic Variables. We have spectroscopically and photometrically identified an orbital period of 26.77 \pm 0.02 minutes for PTF1 J071912.13+485834.0 and found a super-outburst recurrence time of greater than 65 days along with the presence of "normal" outbursts - rarely seen in AM CVn systems but well known in super-outbursting Cataclysmic Variables. We present a long-term light curve over two super-cycles as well as high cadence photometry of both outburst and quiescent stages, both of which show clear variability. We also compare both the outburst and quiescent spectra of PTF1 J071912.13+485834.0 to other known AM CVn systems, and use the quiescent phase-resolved spectroscopy to determine the origin of the photometric variability. Finally, we draw parallels between the different subclasses of SU UMa-type Cataclysmic Variables and outbursting AM CVn systems. We conclude by predicting that the Palomar Transient Factory may more than double the number of outbursting AM CVn systems known, which would greatly increase our understanding of AM CVn systems.
description: 11 pages, 10 figures; accepted to ApJ
Die Längs- und Gierbewegung im achterlichen Seegang
Creators: name: Boese, Peter
Publisher: name: TUHH Universitätsbibliothek
Year: 1966
Subjects: classificationCode: 52.00
subject: Maschinenbau, Energietechnik, Fertigungstechnik: Allgemeines

description: Die Längs- und Gierbewegung im achterlichen Seegang
Local and Global Solvability for Advection-Diffusion Equation on an Evolving Surface with a Boundary
Creators: name: Koba, Hajime
Publisher: name: arXiv
Year: 2019
Subjects: subject: Analysis of PDEs (math.AP)
subject: FOS: Mathematics
subject: 35A01, 35R01, 35R37, 47D06

description: This paper considers the existence of local and global-in-time strong solutions to the advection-diffusion equation with variable coefficients on an evolving surface with a boundary. We apply both the maximal $L^p$-in-time regularity for Hilbert space-valued functions and the semigroup theory to construct local and global-in-time strong solutions to an evolution equation. Using the approach and our function spaces on the evolving surface, we show the existence of local and global-in-time strong solutions to the advection-diffusion equation. Moreover, we derive the asymptotic stability of the global-in-time strong solution.
Optimization of anaerobic digestion: influence of trace elements on methanization processes
Creators: name: Ezebuiro, Nwagbo Christpeace
Publisher: name: GFEU
Year: 2014
Subjects: subject: Trace elements
subject: Methanization
subject: Biocatalysis
subject: Optimization
subject: Conversion rate
subject: Bioavailability
classificationCode: 500
subject: Naturwissenschaften
classificationCode: 540
subject: Chemie

description: Optimierung der anaeroben Vergärung: Einfluss von Spurenelementen auf die Methanbildung (den Methanisierungsprozesse) Nickel, Kobalt, Selen und Molybdän sind Spurenelemente (TEs) und Aktivatoren von Enzymen, die in der Lage sind CH4 aus Kohlenstoffquellen zu erzeugen. Spurenelemente können somit zur Optimierung der Methanisierung genutzt werden. Ziel der Arbeit ist es, einen besseren Abbau flüchtiger Fettsäuren und eine Steigerung der Methanproduktion zu erreichen. Um die Haupteffekte und Wechselwirkungen der TEs zu identifizieren und zu quantifizieren werden Batch-Experimente durchgeführt und mittels multivariater Verfahren ausgewertet. Aus den Ergebnissen der Versuche werden Bereiche der optimalen TEs–Supplementierung abgeleitet und Zufütterungsansätze beurteilt. Mit Hilfe der Batch-Experimente können Mechanismen, die zur verbesserten Methanbildung führen, bestimmt werden. In semi-kontinuierlichen Vergärungsversuchen werden die Ergebnisse der Batch-Experimente validiert und die Prozessstabilität bei steigender organischer Raumbelastung untersucht. Die besten Ergebnisse bezüglich Prozessstabilität und Methanausbeute können mit den, aus den Batch Experimenten, experimentell und statistisch abgeleiteten TEs-Konfigurationen erreicht werden.
description: Optimization of Anaerobic Digestion: Influence of Trace Elements on Methanization Processes Nickel, cobalt, selenium and molybdenum are trace elements (TEs) and activators of enzymes that produce CH4 from carbon sources; thus can be used to optimize methanization processes. Batch experiments and multivariate techniques were used to identify and quantify the main effects and interaction of these TEs during methanization for the purpose of optimizing volatile fatty acids degradation (VFA) and CH4 production. Optimal supplementation ranges were derived; supplementation approaches were evaluated and the mechanisms by which the TEs improve methanization were determined in batch methanization. Results of the batch operations were validated in semi-continuous methanization, with the additional task of increasing organic loading rate without inducing process instability and digester failure. As in the batch process, process stability and optimization aims were achieved in the semi-continuous process using our experimentally and statistically derived optimum TEs configuration.
Testing the Kerr nature of intermediate-mass and supermassive black hole binaries using spin-induced multipole moment measurements
Creators: name: Krishnendu, N. V.
name: Yelikar, Anjali B.
Publisher: name: arXiv
Year: 2019
Subjects: subject: General Relativity and Quantum Cosmology (gr-qc)
subject: FOS: Physical sciences

description: The gravitational wave measurements of spin-induced multipole moment coefficients of a binary black hole system can be used to distinguish black holes from other compact objects [N. V. Krishnendu et al., PRL 119, 091101 (2017)]. Here, we apply the idea proposed in [N. V. Krishnendu et al., PRL 119, 091101 (2017)] to binary systems composed of intermediate-mass and supermassive black holes and derive the expected bounds on their Kerr nature using future space-based gravitational wave detectors. Using astrophysical models of binary black hole population, we study the measurability of the spin-induced quadrupole and octupole moment coefficients using LISA and DECIGO. The errors on spin-induced quadrupole moment parameter of the binary system are found to be { $\leq 0.1$ for almost $3\%$ of the total supermassive binary black hole population which is detectable by LISA whereas it is $\sim 46\%$ for the intermediate-mass black hole binaries observable by DECIGO at its design sensitivity.} We find that { errors on} {\it both} the quadrupole and octupole moment parameters can be estimated to { be} $\leq 1$ for $\sim 2\%$ and $\sim 50\%$ {of the population} respectively for LISA and DECIGO detectors. { Our findings suggest that a subpopulation of binary black hole events, with the signal to noise ratio thresholds greater than 200 and 100 respectively for LISA and DECIGO detectors, would permit tests of black hole nature to 10\% precision.}
description: 7 pages, 6 figures
$μ$ Parameter from Dynamical Rearrangement of U(1) and $θ$ Parameter
Creators: name: Kawamura, Yoshiharu
name: Miura, Takashi
Publisher: name: arXiv
Year: 2011
Subjects: subject: High Energy Physics - Phenomenology (hep-ph)
subject: High Energy Physics - Theory (hep-th)
subject: FOS: Physical sciences

description: We study the generation of $μ$ parameter from the dynamical rearrangement of local U(1) symmetry in a five-dimensional model and discuss phenomenological implications on the $θ$ parameter, under the assumption that supersymmetry is broken by the Scherk-Schwarz mechanism.
description: 16 pages
Stochastic model of randomly end-linked polymer network micro-regions
Creators: name: Norris, Sam C. P.
name: Kasko, Andrea M.
name: Chou, Tom
name: D'Orsogna, Maria R.
Publisher: name: arXiv
Year: 2019
Subjects: subject: Soft Condensed Matter (cond-mat.soft)
subject: Materials Science (cond-mat.mtrl-sci)
subject: FOS: Physical sciences

description: Polymerization and formation of crosslinked polymer networks are important processes in manufacturing, materials fabrication, and in the case of hydrated polymer networks, synthesis of biomedical materials, drug delivery, and tissue engineering. While considerable research has been devoted to the modeling of polymer networks to determine averaged, mean-field, global properties, there are fewer studies that specifically examine the variance of the composition across "micro-regions" (composed of a large, but finite, number of polymer network strands) within the larger polymer network.Here, we mathematically model the stochastic formation of polymer networks comprised of linear homobifunctional network strands that undergo an end-linking gelation process. We introduce a master equation that describes the evolution of the probabilities of possible network micro-region configurations as a function of time and extent of reaction. We specifically focus on the dynamics of network formation and the statistical variability of the gel micro-regions, particularly at intermediate extents of reaction. We also consider possible annealing effects and study how cooperative binding between the two end-groups on a single network-strand affects network formation. Our results allow for a more detailed and thorough understanding of polymer network dynamics and variability of network properties.
description: 16 pages, 9 figures
title: Structural response of stranded ships
title: Strukturantwort bei gestrandeten Schiffen
titleType: AlternativeTitle
Creators: name: Zipfel, Bernadette
Publisher: name: TUHH Universitätsbibliothek
Year: 2014
Subjects: subject: Weiche Grundberührung
subject: Strandung
subject: Strukturschaden
subject: Momenten-Querkraft-Interaktion
subject: Bodeneinfluss
subject: Soft grounding
subject: stranding
subject: structural damage
subject: moment-shear force interaction
subject: influence of soil
subject: Strandung
subject: Struktur
subject: Schiffbau
subject: Finite-Elemente-Methode
subject: Strukturanalyse
subject: Konstruktion

description: In der Dissertation werden verschiedene Methoden vorgestellt, die die Strukturantwort des Schiffes bei weicher Grundberührung, auch Strandung genannt, in Tidegewässern berechnen. Die kritischen Kombinationen aus Strandungsposition, Tideeffekten und Beladung sowie globale und lokale Schäden u.a. unter Verwendung der Finiten-Elemente Methode werden berechnet. Der Einfluss der Querkraft auf das Grenztraglastmoment wird über neue Momenten-Querkraft-Interaktionskurven bestimmt. Die Berechnung eines wirklichen Strandungsunfalls mit den vorgeschlagenen Methoden zeigt sehr gute Übereinstimmungen.
description: The thesis reports on different methods to assess the consequences of soft grounding accidents, called stranding, to the ship structure in tidal waters. The critical combinations of stranding position, tidal range and load case are calculated as well as the complete global and local damage process with the finite element method. Moment-shear force interaction curves based on the combined loading conditions are given to evaluate the influence of the shear force on the ultimate hull girder strength. The proposed methods are applicable to any ship type for calculating real stranding accidents. Very good conformance with one known accident is achieved.
Improved bounds for restricted projection families via weighted Fourier restriction
Creators: name: Harris, Terence L. J.
Publisher: name: arXiv
Year: 2019
Subjects: subject: Classical Analysis and ODEs (math.CA)
subject: Analysis of PDEs (math.AP)
subject: FOS: Mathematics
subject: 42B10, 28E99

description: It is shown that if $A \subseteq \mathbb{R}^3$ is a Borel set of Hausdorff dimension $\dim A \in (3/2,5/2)$, then for a.e. $θ\in [0,2π)$ the projection $π_θ(A)$ of $A$ onto the 2-dimensional plane orthogonal to $\frac{1}{\sqrt{2}}(\cos θ, \sin θ, 1)$ satisfies $\dim π_θ(A) \geq \max\left\{\frac{4\dim A}{9} + \frac{5}{6},\frac{2\dim A+1}{3} \right\}$. This improves the bound of Oberlin and Oberlin, and of Orponen and Venieri, for $\dim A \in (3/2,5/2)$. More generally, a weaker lower bound is given for families of planes in $\mathbb{R}^3$ parametrised by curves in $S^2$ with nonvanishing geodesic curvature.
description: 50 pages, 1 figure. Accepted version
Equivariant dendroidal sets and simplicial operads
Creators: name: Bonventre, Peter
name: Pereira, Luis Alexandre
Publisher: name: arXiv
Year: 2019
Subjects: subject: Algebraic Topology (math.AT)
subject: FOS: Mathematics

description: We establish a Quillen equivalence between the homotopy theories of equivariant Segal operads and equivariant simplicial operads with norm maps. Together with previous work, we further conclude that the homotopy coherent nerve is a right-Quillen equivalence from the model category of equivariant simplicial operads with norm maps to the model category structure for equivariant-$\infty$-operads in equivariant dendroidal sets.
description: v3: Improvements to exposition and minor edits, in response to referee suggestions
Symplectic non-squeezing for the KdV flow on the line
Creators: name: Ntekoume, Maria
Publisher: name: arXiv
Year: 2019
Subjects: subject: Analysis of PDEs (math.AP)
subject: FOS: Mathematics

description: We show symplectic non-squeezing for the KdV equation on the line $\mathbb R$. This is achieved via finite-dimensional approximation. Our choice of finite-dimensional Hamiltonian system that effectively approximates the KdV flow is inspired by the recent breakthrough of Killip and Visan in the well-posedness theory of KdV in low regularity spaces, relying on its completely integrable structure. We also prove and exploit a weak well-posedness result for KdV in $H^{-1}(\mathbb R)$. Furthermore, the employment of our methods provides a new concise proof for the known result of symplectic non-squeezing for the same equation on the circle $\mathbb T$, first proved by Colliander, Keel, Staffilani, Takaoka, and Tao.
description: 49 pages
A skeletal mechanism for premixed flames of isooctane/2-methylfuran blends
Creators: name: Bhattacharya, Atmadeep
Publisher: name: arXiv
Year: 2019
Subjects: subject: Chemical Physics (physics.chem-ph)
subject: FOS: Physical sciences

description: A skeletal chemical kinetic mechanism containing 252 species and 1288 reactions for the simulation of premixed flames involving isooctane (representing gasoline) and 2MF blends has been proposed in the present work.
description: Submitted to Fuel
Radio stacking reveals evidence for star formation in the host galaxies of X-ray selected active galactic nuclei at z<1
Creators: name: Pierce, C. M.
name: Ballantyne, D. R.
name: Ivison, R. J.
Publisher: name: arXiv
Year: 2011
Subjects: subject: Cosmology and Nongalactic Astrophysics (astro-ph.CO)
subject: FOS: Physical sciences

description: Nuclear starbursts may contribute to the obscuration of active galactic nuclei (AGNs). The predicted star formation rates are modest, and, for the obscured AGNs that form the X-ray background at z < 1, the associated faint radio emission lies just beyond the sensitivity limits of the deepest surveys. Here, we search for this level of star formation by studying a sample of 359 X-ray selected AGNs at z < 1 from the COSMOS field that are not detected by current radio surveys. The AGNs are separated into bins based on redshift, X-ray luminosity, obscuration, and mid-infrared characteristics. An estimate of the AGN contribution to the radio flux density is subtracted from each radio image, and the images are then stacked to uncover any residual faint radio flux density. All of the bins containing 24 micron-detected AGNs are detected with a signal-to-noise >3sigma in the stacked radio images. In contrast, AGNs not detected at 24 microns are not detected in the resulting stacked radio images. This result provides strong evidence that the stacked radio signals are likely associated with star formation. The estimated star formation rates derived from the radio stacks range from 3 solar masses per year to 29 solar masses per year. Although it is not possible to associate the radio emission with a specific region of the host galaxies, these results are consistent with the predictions of nuclear starburst disks in AGN host galaxies.
description: 35 pages, 12 figures, accepted by ApJ
Bogomolny equations for the BPS Skyrme models with impurity
Creators: name: Stȩpień, Ł. T.
Publisher: name: arXiv
Year: 2019
Subjects: subject: High Energy Physics - Theory (hep-th)
subject: Mathematical Physics (math-ph)
subject: FOS: Physical sciences
subject: 35Q51

description: We show that the BPS Skyrme model, as well as its (2+1) dimensional baby version (restricted), can be coupled with an impurity in the BPS preserving manner. The corresponding Bogomolny equations are derived.
description: arXiv admin note: substantial text overlap with arXiv:1512.01231
Berechnung des durch die Kavitationsgebiete auf den Propellerflügeln an einer Platte induzierten instationären Druckes
Creators: name: Zimmermann, Bernhard
Publisher: name: TUHH Universitätsbibliothek
Year: 1977
Subjects: classificationCode: 52.00
subject: Maschinenbau, Energietechnik, Fertigungstechnik: Allgemeines

description: Berechnung des durch die Kavitationsgebiete auf den Propellerflügeln an einer Platte induzierten instationären Druckes
Pangenesis: a common origin for visible and dark matter
Creators: name: Volkas, Raymond R.
Publisher: name: arXiv
Year: 2012
Subjects: subject: High Energy Physics - Phenomenology (hep-ph)
subject: FOS: Physical sciences

description: The similar mass densities observed for visible and dark matter in the present-day universe suggest a common origin for both. A scheme called "pangenesis" for realising this using the Affleck-Dine mechanism in a baryon-symmetric universe is presented in this talk.
description: 8 pages. Invited talk, CosPA 2011, Beijing Oct 2011, to appear in the proceedings
Observation of Magnetic Proximity Effect Using Resonant Optical Spectroscopy of an Electrically Tunable MoSe$_2$/CrBr$_3$ Heterostructure
Creators: name: Ciorciaro, Livio
name: Kroner, Martin
name: Watanabe, Kenji
name: Taniguchi, Takashi
name: Imamoglu, Atac
Publisher: name: arXiv
Year: 2020
Subjects: subject: Mesoscale and Nanoscale Physics (cond-mat.mes-hall)
subject: FOS: Physical sciences

description: Van der Waals heterostructures combining two-dimensional magnetic and semiconducting layers constitute a promising platform for interfacing magnetism, electronics, and optics. Here, we use resonant optical reflection spectroscopy to the observe magnetic proximity effect in a gate-tunable MoSe$_2$/CrBr$_3$ heterostructure. High quality of the interface leads to a giant zero-field splitting of the K and K' valley excitons in MoSe$_2$, equivalent to an external magnetic field of 12 T, with a weak but distinct electric field dependence that hints at potential for electrical control of magnetization. The magnetic proximity effect allows us to use resonant optical spectroscopy to fully characterize the CrBr$_3$ magnet, determining the easy-axis coercive field, the magnetic anisotropy energy, and critical exponents associated with spin susceptibility and magnetization.
Das Schiffbaulaboratorium zu Hamburg 1924-1989
Creators: name: Kloppenburg, Meinolf
Publisher: name: TUHH Universitätsbibliothek
Year: 1995
Subjects: subject: Schiffbaulaboratorium
classificationCode: 52.00
subject: Maschinenbau, Energietechnik, Fertigungstechnik: Allgemeines
subject: Schiffbau

description: Das Schiffbaulaboratorium zu Hamburg 1924-1989
Leptogenesis by curvature coupling of heavy neutrinos
Creators: name: Lambiase, Gaetano
name: Mohanty, Subhendra
Publisher: name: arXiv
Year: 2011
Subjects: subject: High Energy Physics - Phenomenology (hep-ph)
subject: FOS: Physical sciences

description: We introduce a CP violating coupling between the Ricci curvature and the heavy right handed neutrinos. This splits the Majorana masses of the left and the right handed heavy neutrinos. When the heavy neutrinos decay, their decay rates are different into left and right chirality light neutrinos. A time varying non-zero Ricci curvature can give rise to a net lepton asymmetry. The source of a non-zero curvature in a radiation era is the quantum fluctations of primordial fields.
description: 13 pages. Accepted for publication in PRD
Panoramic Survey of Lyman α Emitters at z=3.1
Creators: name: Yamada, T.
name: Nakamura, Y.
name: Matsuda, Y.
name: Hayashino, T.
name: Yamauchi, R.
name: Morimoto, N.
name: Kousai, K.
name: Umemura, M.
Publisher: name: arXiv
Year: 2012
Subjects: subject: Cosmology and Nongalactic Astrophysics (astro-ph.CO)
subject: FOS: Physical sciences

description: We present the results of the extensive narrow-band survey of Lyα emission-line objects at z=3.1 in the 1.38 deg^2 area surrounding the high density region of star-forming galaxies at z=3.09 in the SSA22 field, as well as in the 1.04 deg^2 area of the three separated general blank fields. In total of 2161 Lyα emitters, 1394 in the SSA22 fields and 767 in the general fields, respectively, are detected to the narrow-band AB magnitude limit of 25.73, which corresponds to the line flux of 1.8 x 10^{-17} erg s^{-1} cm^{-2} or luminosity of 1.5 x 10^{42} erg s^{-1} at z=3.1, above the observed equivalent width threshold, 190Å. The average surface number density of the emitters at z=3.1 in the whole general fields above the thresholds is 0.20+-0.01 arcmin^{-2}. The SSA22 high-density region at z=3.09 whose peak local density is 6 times the average is found to be the most prominent outstanding structure in the whole surveyed area and is firmly identified as a robust `protocluster' with the enough large sample. We also compared the overdensity of the 100 arcmin^2 and 700 arcmin^2 areas which contain the protocluster with the expected fluctuation of the dark matter as well as those of the model galaxies in cosmological simulations. We found that the peak height values of the overdensity correspond to be 8-10 times and 3-4 times of the expected standard deviations of the counts of Lyαemitters at z=3.1 in the corresponding volume, respectively. We conclude that the structure at z=3.09 in the SSA22 field is a very significant and rare density peak up to the scale of 60 Mpc.
description: 15pages, accepted for publication Astronomical Journal
Magneto-Josephson effects in junctions with Majorana bound states
Creators: name: Jiang, Liang
name: Pekker, David
name: Alicea, Jason
name: Refael, Gil
name: Oreg, Yuval
name: Brataas, Arne
name: von Oppen, Felix
Publisher: name: arXiv
Year: 2012
Subjects: subject: Mesoscale and Nanoscale Physics (cond-mat.mes-hall)
subject: Superconductivity (cond-mat.supr-con)
subject: Quantum Physics (quant-ph)
subject: FOS: Physical sciences

description: We investigate 1D quantum systems that support Majorana bound states at interfaces between topologically distinct regions. In particular, we show that there exists a duality between particle-hole and spin degrees of freedom in certain spin-orbit-coupled 1D platforms such as topological insulator edges. This duality results in a spin analogue of previously explored `fractional Josephson effects'---that is, the spin current flowing across a magnetic junction exhibits 4π-periodicity in the relative magnetic field angle across the junction. Furthermore, the interplay between the particle-hole and spin degrees of freedom results in unconventional magneto-Josephson effects, such that the Josephson current is a function of the magnetic field orientation with periodicity 4π.
description: 11 pages, 3 figures
title: Resource efficiency of urban sanitation systems : a comparative assessment using material and energy flow analysis
title: Ressourceneffizienz städtischer Abwassersysteme: eine vergleichende Bewertung mittels Stoffstrom- und Energieanalysen
titleType: AlternativeTitle
Creators: name: Meinzinger, Franziska
Publisher: name: TUHH Universitätsbibliothek
Year: 2010
Subjects: subject: Ressourceneffizienz
subject: Stoffstromanalyse
subject: Energieanalyse
subject: resource efficiency
subject: material flow analysis
subject: energy analysis
subject: resource recovery
subject: Arba Minch
classificationCode: 620
subject: Ingenieurwissenschaften
classificationCode: 56.35
subject: Siedlungswasserwirtschaft, industrielle Wasserwirtschaft
classificationCode: 43.99
subject: Umweltforschung, Umweltschutz: Sonstiges
classificationCode: 43.70
subject: Entwicklungsländer und Umwelt
classificationCode: 58.51
subject: Abwassertechnik, Wasseraufbereitung
subject: Ressourcenmanagement
subject: Abwasserverwertung
subject: Systemanalyse
subject: Stoffstrommanagement
subject: Ökoeffizienz
subject: Entscheidungsunterstützung
subject: Äthiopien
subject: Hamburg

description: Die vorliegende Arbeit leistet einen Beitrag zur Bewertung der Ressourceneffizienz städtischer Abwassersysteme unter Anwendung von kombinierten Kosten-, Energie- und Stoffstromanalysen (ceMFA). Für zwei Fallbeispiele, Hamburg in Deutschland und Arba Minch in Äthiopien, wurde eine Reihe von möglichen Systementwicklungen untersucht. Eine geeignete Umgestaltung der Abwassersysteme bietet die Möglichkeit zur Reduzierung des Wasserverbrauchs, zur Erhöhung der Energieeffizienz und zur Rückgewinnung von Nährstoffen für die Landwirtschaft. Das ceMFA Modell erlaubt die Identifikation solcher Möglichkeiten und verdeutlicht mögliche Zielkonflikte. Damit kann diese Arbeit als Basis für eine Entscheidungsunterstützung verwendet werden, um Strategien für die Einführung ressourceneffizienterer Systeme zu entwickeln.
description: This study contributes to assessing the resource efficiency of urban sanitation systems using combined cost, energy and material flow analyses (ceMFA). For two case studies, Hamburg in Germany and Arba Minch in Ethiopia, a number of possible system developments were assessed. Introducing appropriate system transformations in sanitation can provide the opportunity to reduce water consumption, increase energy efficiency and recover nutrients for agriculture. The ceMFA model allows the identification of such opportunities and highlights possible trade-offs. Using this work as a basis for decision support, strategies for implementing more resource efficient systems can be developed.
Development of a highly integrated and radiation-tolerant software-defined radio platform for multi-band radio applications in space systems
Creators: name: Budroweit, Jan
Publisher: name: TUHH Universitätsbibliothek
Year: 2021
Subjects: classificationCode: 620
subject: Ingenieurwissenschaften

description: Die vorliegende Arbeit beschäftigt sich mit dem Entwurf einer hoch integrierten und strahlungstoleranten Software-Defined Radio (SDR) Plattform für Mehrkanal-Funkanwendungen in Raumfahrtsystemen. Dabei adressiert der beschriebene Entwurf die risikominimierte Verwendung von nicht-raumfahrqualifizierter Elektronikkomponenten in kritischen Raumfahrtsystemen, welche letztendlich für die Entwicklung und Verifikation der hier vorgestellten innovativen SDR Plattform angewendet wird.
description: The present thesis deals with the design of a highly integrated and radiation tolerant software-defined radio (SDR) platform for multi-channel radio applications in space systems. The described design addresses the risk-minimized use of non-space qualified electronic components for critical space systems, which is ultimately used for the development and verification of the innovative SDR platform presented in this work.
Preparation of Knill-Laflamme-Milburn states using tunable controlled phase gate
Creators: name: Lemr, Karel
Publisher: name: arXiv
Year: 2011
Subjects: subject: Quantum Physics (quant-ph)
subject: Computational Physics (physics.comp-ph)
subject: FOS: Physical sciences

description: A specific class of partially entangled states known as Knill-Laflamme-Milburn states (or KLM states) has been proved to be useful in relation to quantum information processing [Knill et al., Nature 409, 46 (2001)]. Although the usage of such states is widely investigated, considerably less effort has been invested into experimentally accessible preparation schemes. This paper discusses the possibility to employ a tunable controlled phase gate to generate an arbitrary Knill-Laflamme-Milburn state. In the first part, the idea of using the controlled phase gate is explained on the case of two-qubit KLM states. Optimization of the proposed scheme is then discussed for the framework of linear optics. Subsequent generalization of the scheme to arbitrary n-qubit KLM state is derived in the second part of this paper.
description: 5 pages, 4 figures, accepted in Journal of Physics B
Eigenvalue estimates for Kato-type Ricci curvature conditions
Creators: name: Rose, Christian
name: Wei, Guofang
Publisher: name: arXiv
Year: 2020
Subjects: subject: Differential Geometry (math.DG)
subject: Analysis of PDEs (math.AP)
subject: Spectral Theory (math.SP)
subject: FOS: Mathematics

description: We prove that optimal lower eigenvalue estimates of Zhong-Yang type as well as a Cheng-type upper bound for the first eigenvalue hold on closed manifolds assuming only a Kato condition on the negative part of the Ricci curvature. This generalizes all earlier results on $L^p$-curvature assumptions. Moreover, we introduce the Kato condition on compact manifolds with boundary with respect to the Neumann Laplacian, leading to Harnack estimates for the Neumann heat kernel and lower bounds for all Neumann eigenvalues, what provides a first insight in handling variable Ricci curvature assumptions in this case.
description: 21 pages. The proof of Theorem 1.3 is replaced by an easier one
Spatial Patterns of Walking, Cycling, and Public Transport Mobility and Associated Neighbourhood Characteristics in Dublin, Ireland
Creators: name: Credit, Kevin
Publisher: name: Zenodo
Year: 2023
Subjects: public transport, mobility, travel times, spatial modeling, cycling

description: This paper explores the spatial patterns of walking, cycling, and public transport mobility in Dublin using a novel methodology that queries all neighbourhood-to-neighbourhood travel times within the region (by mode). These travel times are converted to travel costs and divided by Euclidean distance to create relative measures of mobility (cost-distance ratios). Analysing the neighbourhood
 characteristics of the origins and destinations for these ratios shows that racial/ethnic diversity, low socioeconomic status, and poor health are all related to relatively more costly (i.e., slow) public transit service. However, some of these neighbourhoods are relatively well-served by walking and cycling infrastructure.
Heterogeneity Pursuit for Spatial Point Pattern with Application to Tree Locations: A Bayesian Semiparametric Recourse
Creators: name: Jiao, Jieying
name: Hu, Guanyu
name: Yan, Jun
Publisher: name: arXiv
Year: 2020
Subjects: subject: Methodology (stat.ME)
subject: FOS: Computer and information sciences

description: Spatial point pattern data are routinely encountered. A flexible regression model for the underlying intensity is essential to characterizing the spatial point pattern and understanding the impacts of potential risk factors on such pattern. We propose a Bayesian semiparametric regression model where the observed spatial points follow a spatial Poisson process with an intensity function which adjusts a nonparametric baseline intensity with multiplicative covariate effects. The baseline intensity is piecewise constant, approached with a powered Chinese restaurant process prior which prevents an unnecessarily large number of pieces. The parametric regression part allows for variable selection through the spike-slab prior on the regression coefficients. An efficient Markov chain Monte Carlo (MCMC) algorithm is developed for the proposed methods. The performance of the methods is validated in an extensive simulation study. In application to the locations of Beilschmiedia pendula trees in the Barro Colorado Island forest dynamics research plot in central Panama, the spatial heterogeneity is attributed to a subset of soil measurements in addition to geographic measurements with a spatially varying baseline intensity.
description: 21 pages, 7 figures
Strongly correlated doped hole carriers in the superconducting nickelates: Their location, local many-body state, and low-energy effective Hamiltonian
Creators: name: Lang, Zi-Jian
name: Jiang, Ruoshi
name: Ku, Wei
Publisher: name: arXiv
Year: 2020
Subjects: subject: Superconductivity (cond-mat.supr-con)
subject: FOS: Physical sciences

description: The families of high-temperature superconductors recently welcomed a new member: hole doped nickelate Nd$_{0.8}$Sr$_{0.2}$NiO$_2$ with a $\sim$15K transition temperature. To understand its emergent low-energy behaviors and experimental properties, an immediate key question is whether the superconducting hole carriers reside in oxygen as in the cuprates, or in nickel as in most nickelates. We answer this crucial question via a ``(LDA+$U$)+ED'' scheme: deriving an effective interacting Hamiltonian of the hole carriers from density functional LDA+$U$ calculation, and studying its local many-body states via exact diagonalization. Surprisingly, distinct from the expected Ni$^{2+}$ spin-triplet state found in most nickelates, the local ground state of two holes is actually a Ni-O spin-singlet state with second hole greatly residing in oxygen. The emerged eV-scale model therefore resembles that of the cuprates, advocating further systematic experimental comparisons. Tracing the microscopic origin of this unexpected result to the lack of apical oxygen in this material, we proposed a route to increase superconducting temperature, and a possible quantum phase transition absent in the cuprates.
description: 6 pages, 2 figures
Photogrammetrische Formbestimmung der Kavitationsblasen
Creators: name: Döhler, M.
name: Ringle, K.
Publisher: name: TUHH Universitätsbibliothek
Year: 1975
Subjects: classificationCode: 620
subject: Ingenieurwissenschaften
classificationCode: 620
subject: Engineering and allied operations
classificationCode: 52.00
subject: Maschinenbau, Energietechnik, Fertigungstechnik: Allgemeines

description: Photogrammetrische Formbestimmung der Kavitationsblasen
Windkanalversuche mit dem Modell des Forschungsschiffes "Meteor"
Creators: name: Wagner, Bernd
Publisher: name: TUHH Universitätsbibliothek
Year: 1966
Subjects: classificationCode: 52.00
subject: Maschinenbau, Energietechnik, Fertigungstechnik: Allgemeines

description: Windkanalversuche mit dem Modell des Forschungsschiffes "Meteor"
Flood Impact to Urban Transport Networks Considering the Flooding Propagation- A case study of Beijing, China
Creators: name: Liu, Yimeng
name: Ford, Alistair
name: Dawson, Richard
name: Yang, Saini
Publisher: name: Zenodo
Year: 2023
Subjects: urban flooding; impact assessment; traffic simulation

description: Urban transport networks are vulnerable to surface water flooding, leading to impacts on economic activities, social well-being and the environment. This paper describes a flood-impact-assessment method to comprehensively assessed the economic impacts of traffic disruption from flooding in terms of time delay, fuel consumption and pollutant emission. Urban flooding in Beijing is simulated using the CADDIES-2D model, and impacts are propagated onto the transport network for assessment using the SUMO agent-based transport model. Comparing the economic damage of the baseline traffic scenario with that of three flooded scenarios, it’s demonstrated that rainfall occurring at 7 a.m. induces four times more cost than the baseline. The rain of the same intensity and duration occurring at 8 or 9 a.m. lead to a cost increase for 37.33% and 13.21% respectively.
Audio mixing in a tri-port nano-electro-mechanical device
Creators: name: Defoort, M.
name: Lulla, K.
name: Heron, J. -S.
name: Bourgeois, O.
name: Collin, E.
name: Pistolesi, Fabio
Publisher: name: arXiv
Year: 2011
Subjects: subject: Mesoscale and Nanoscale Physics (cond-mat.mes-hall)
subject: FOS: Physical sciences

description: We report on experiments performed on a cantilever-based tri-port nano-electro-mechanical (NEMS) device. Two ports are used for actuation and detection through the magnetomotive scheme, while the third port is a capacitively coupled gate electrode. By applying a low frequency voltage signal on the gate, we demonstrate mixing in the mechanical response of the device, even for {\it low magnetomotive drives, without resorting to conduction measurements through the NEMS}. The technique can thus be used in particular in the linear regime, as an alternative to nonlinear mixing, for normal conducting devices. An analytic theory is presented reproducing the data without free parameters
Control Interface for Hands-free Navigation of Standing Mobility Vehicles based on Upper-Body Natural Movements
Creators: name: Chen, Yang
name: Paez-Granados, Diego
name: Kadone, Hideki
name: Suzuki, Kenji
Publisher: name: arXiv
Year: 2020
Subjects: subject: Robotics (cs.RO)
subject: Human-Computer Interaction (cs.HC)
subject: Systems and Control (eess.SY)
subject: FOS: Computer and information sciences
subject: FOS: Electrical engineering, electronic engineering, information engineering

description: In this paper, we propose and evaluate a novel human-machine interface (HMI) for controlling a standing mobility vehicle or person carrier robot, aiming for a hands-free control through upper-body natural postures derived from gaze tracking while walking. We target users with lower-body impairment with remaining upper-body motion capabilities. The developed HMI bases on a sensing array for capturing body postures; an intent recognition algorithm for continuous mapping of body motions to robot control space; and a personalizing system for multiple body sizes and shapes. We performed two user studies: first, an analysis of the required body muscles involved in navigating with the proposed control; and second, an assessment of the HMI compared with a standard joystick through quantitative and qualitative metrics in a narrow circuit task. We concluded that the main user control contribution comes from Rectus Abdominis and Erector Spinae muscle groups at different levels. Finally, the comparative study showed that a joystick still outperforms the proposed HMI in usability perceptions and controllability metrics, however, the smoothness of user control was similar in jerk and fluency. Moreover, users' perceptions showed that hands-free control made it more anthropomorphic, animated, and even safer.
description: 2020 IEEE. Personal use of this material is permitted. Permission from IEEE must be obtained for all other uses
Food Mobile App Development Company
Creators: name: Nagar, Tarun
Publisher: name: Zenodo
Year: 2021

description: We all know that the food industry is an evergreen industry across the world. The never-ending craving for food among the people is taking this food industry to a new level. This gives a significant boost to various on-demand food delivery apps that exist in the market. Along with every country in the world, UAE also has a scalable users base for on-demand food delivery apps.
New jump operators on equivalence relations
Creators: name: Clemens, John D.
name: Coskey, Samuel
Publisher: name: arXiv
Year: 2020
Subjects: subject: Logic (math.LO)
subject: FOS: Mathematics
subject: 03E15, 03C15, 06A05

description: We introduce a new family of jump operators on Borel equivalence relations; specifically, for each countable group $Γ$ we introduce the $Γ$-jump. We study the elementary properties of the $Γ$-jumps and compare them with other previously studied jump operators. One of our main results is to establish that for many groups $Γ$, the $Γ$-jump is \emph{proper} in the sense that for any Borel equivalence relation $E$ the $Γ$-jump of $E$ is strictly higher than $E$ in the Borel reducibility hierarchy. On the other hand there are examples of groups $Γ$ for which the $Γ$-jump is not proper. To establish properness, we produce an analysis of Borel equivalence relations induced by continuous actions of the automorphism group of what we denote the full $Γ$-tree, and relate these to iterates of the $Γ$-jump. We also produce several new examples of equivalence relations that arise from applying the $Γ$-jump to classically studied equivalence relations and derive generic ergodicity results related to these. We apply our results to show that the complexity of the isomorphism problem for countable scattered linear orders properly increases with the rank.
The short-period S-stars S4711, S62, S4714 and the Lense-Thirring effect due to the spin of Sgr A$^\ast$
Creators: name: Iorio, Lorenzo
Publisher: name: arXiv
Year: 2020
Subjects: subject: General Relativity and Quantum Cosmology (gr-qc)
subject: High Energy Astrophysical Phenomena (astro-ph.HE)
subject: Solar and Stellar Astrophysics (astro-ph.SR)
subject: FOS: Physical sciences

description: Recently, some S-stars (S4711, S62, S4714) orbiting the supermassive black hole (SMBH) in Sgr A$^\ast$ with short orbital periods ($7.6\,\mathrm{yr}\leq P_\mathrm{b}\leq 12\,\mathrm{yr}$) were discovered. It was suggested that they may be used to measure the general relativistic Lense-Thirring (LT) precessions of their longitudes of ascending node $\mathitΩ$ induced by the SMBH's angular momentum $\boldsymbol{J}_\bullet$. In fact, the proposed numerical estimates hold only in the particular case of a perfect alignment of $\boldsymbol{J}_\bullet$ with the line of sight, which does not seem to be the case. Moreover, also the inclination $I$ and the argument of perinigricon $ω$ undergo LT precessions for an arbitrary orientation of $\boldsymbol{J}_\bullet$ in space. We explicitly show the analytical expressions of $\dot I^\mathrm{LT},\,\dot{\mathitΩ}^\mathrm{LT},\,ω^\mathrm{LT}$ in terms of the SMBH's spin polar angles $i^\bullet,\,\varepsilon^\bullet$ by finding the range of values for each of them in arcseconds per year ($^{\prime\prime}\,\mathrm{yr}^{-1}$). For each star, the corresponding values of $i^\bullet_\mathrm{max},\,\varepsilon^\bullet_\mathrm{max}$ and $i^\bullet_\mathrm{min},\,\varepsilon^\bullet_\mathrm{min}$ are determined as well, along with those $i_0^\bullet,\,\varepsilon_0^\bullet$ that cancel the LT precessions. The LT perinigricon precessions $\dotω^\mathrm{LT}$ are overwhelmed by the systematic uncertainties in the Schwarzschild ones due to the current errors in the stars' orbital parameters and the mass of Sgr A$^\ast$ itself. [Abridged]
description: LateX2e, 14 pages, 5 tables, 3 figures. Sign in front of the periastron precession corrected in Equation (4) and Equation (10). Pictures for the periastron precessions replaced in Figures (1) to (3). Table 4 for the periastron precessions corrected
The sceptical Bayes factor for the assessment of replication success
Creators: name: Pawel, Samuel
name: Held, Leonhard
Publisher: name: arXiv
Year: 2020
Subjects: subject: Methodology (stat.ME)
subject: FOS: Computer and information sciences

description: Replication studies are increasingly conducted but there is no established statistical criterion for replication success. We propose a novel approach combining reverse-Bayes analysis with Bayesian hypothesis testing: a sceptical prior is determined for the effect size such that the original finding is no longer convincing in terms of a Bayes factor. This prior is then contrasted to an advocacy prior (the reference posterior of the effect size based on the original study), and replication success is declared if the replication data favour the advocacy over the sceptical prior at a higher level than the original data favoured the sceptical prior over the null hypothesis. The sceptical Bayes factor is the highest level where replication success can be declared. A comparison to existing methods reveals that the sceptical Bayes factor combines several notions of replicability: it ensures that both studies show sufficient evidence against the null and penalises incompatibility of their effect estimates. Analysis of asymptotic properties and error rates, as well as case studies from the Social Sciences Replication Project show the advantages of the method for the assessment of replicability.
Random Forest-based model for water regime type prediction in the northwest of the European part of Russia
Creators: name: Ayzel, Georgy
Publisher: name: Zenodo
Year: 2021
Subjects: hydrology, Russia, machine learning, wate regime

description: The Random Forest-based model for water regime type prediction in the northwest of the European part of Russia. The model uses the input sequence of relative monthly runoff ratios (in %) to predict the particular type of water regime. Below we provide the pseudocode in the Python programming language that could guide such predictions. import pickle # 1. set path for the downloaded model path = "/path/to/model/RandomForestModel.pkl" # 2. load the model instance model = pickle.load(open(path, 'rb')) # 3. define relative monthly climatological hydrograph # (in % of annual runoff) hydrograph = [2,2,2,14,35,15,10,4,4,4,4,4] # 4. make a prediction type = model.predict(np.array(hydrograph).reshape(1,-1)) # 5. print results print(type) # output: [3.]