cometadata/datacite-rtg-text-other-reclassification-records huggingface dataset:
Large time blow up for a perturbation of the cubic Szegő equation
Creators: name: Xu, Haiyan
Publisher: name: arXiv
Year: 2013
Subjects: subject: Analysis of PDEs (math.AP)
subject: FOS: Mathematics

description: We consider the following Hamiltonian equation on a special manifold of rational functions, \[i\p\_tu=Π(|u|^2u)+\al (u|1),\ \al\in\R,\] where $Π$ denotes the Szegő projector on the Hardy space of the circle $\SS^1$. The equation with $\al=0$ was first introduced by G{é}rard and Grellier in \cite{GG1} as a toy model for totally non dispersive evolution equations. We establish the following properties for this equation. For $\al\textless{}0$, any compact subset of initial data leads to a relatively compact subset of trajectories. For $\al\textgreater{}0$, there exist trajectories on which high Sobolev norms exponentially grow with time.
description: page number:15
title: Mitteilungen ; Quellennachweis für die Abbildungen
Creators: name: Redaktion, Die
Publisher: name: University Library Heidelberg
Year: 2014

description: Denkmalpflege in Baden-Württemberg – Nachrichtenblatt der Landesdenkmalpflege, Bd. 14, Nr. 2 (1985), Beginn und Erscheinungsfrequenz: Ausgaben pro Band: 4
Report on potential risks of DTs in public administration
Creators: name: Mancini, Sara
name: Carmeno, Noemi Luna
Publisher: name: Zenodo
Year: 2022

description: This report aims at identifying foreseeable risks that may be associated with the introduction of disruptive technologies in the public sector. It will be the basis for further analysis in the ETAPAS project, in particular the development of means to operationalize and measure the various types of risk. The report begins with a short clarification of some central concepts that we refer to. This is followed by a description of the methodology, after which follows the main part of the report, which is a list of the identified risks, grouped in eight major categories.
title: Care Through Play, Anywhere: Designing Solutions For Digital Play Therapy
Creators: name: Li, Jingyuan
Publisher: name: Emily Carr University of Art and Design
Year: 2022
Subjects: subject: Play therapy
valueUri: https://id.loc.gov/authorities/subjects/sh85103375
subject: Mental health
valueUri: https://id.loc.gov/authorities/subjects/sh85083615
subject: Therapist and patient
valueUri: https://id.loc.gov/authorities/subjects/sh85134732
subject: Pediatrics
valueUri: https://id.loc.gov/authorities/subjects/sh85099185

description: Since the beginning of the COVID-19 pandemic, many services and businesses have been transitioned online to avoid travel and exposure. A number of these timely adaptations started as a compromise, but are now expected to continue even after the pandemic is over. Telehealth and teletherapy were among the most prominent examples—as doctors, therapists, and counselors moved to deliver their services remotely. In the last week of March 2020, telehealth encounters in the United States increased by 154% compared to 2019 (Koonin et al., 2020, p. 1598). As counseling sessions were made available from home, many saw the benefits of teletherapy, including increased accessibility, timeliness, convenience, continuity of care, and patients’ comfort of being in their own space. However, unlike conversation therapies, play therapies for children rely on the act of physical play and equipment such as toys and a sand tray. As a result, play therapists have been challenged in adapting to the current model of video-based teletherapy. Based on information gathered from the primary research with counselors and play therapists, most challenges are related to the reduced therapeutic quality due to the lack of support from technology, despite the amount of interest to include more digital tools in their practice. To explore ways to solve these challenges, the researcher analyzed the data from interview sessions with the therapists and generated a list of design principles. Following these established principles, an iterative approach was initiated and included brainstorming, system mapping, wireframing, and a series of digital prototypes. Multiple possibilities of digital play therapy were explored with active participation and feedback from the professionals.
Data for "GAN-Aimbots: The Next Generation of Cheating in Multiplayer Video Games"
Creators: name: Kanervisto, Anssi
name: Hautamäki, Ville
name: Kinnunen, Tomi
Publisher: name: Zenodo
Year: 2022
Subjects: python
data
vizdoom

description: The code and data used for the paper "GAN-Aimbots: The Next Generation of Cheating in Multiplayer Video Games". This code and data is frozen to the exact version used in the paper results. See README files for further info. Note that data is compressed as "data.zip". You need to extract it to be able to use it with the code (e.g., code file "classification.py" and "data" directory should be in the directory, and "data" directory should contain directories such as "data_collection_1" and "data_collection_2).
MPI-guided endovascular therapy of 3D printed human aneurysms
Creators: name: Herz, Stefan
name: Kampf, Thomas
name: Rückert, Martin A.
name: Behr, Volker C.
name: Bley, Thorsten A.
name: Vogel, Patrick
Publisher: name: International Journal on Magnetic Particle Imaging IJMPI
Year: 2023

description: Endovascular treatment of human aneurysms with stent grafts is an established therapeutic strategy to treat ruptured and unruptured arterial aneurysms. These stents are covered with a membrane that blocks blood flow to the aneurysm and promotes healing of the vessel. To date, digital subtraction angiography (DSA) has been gold standard for image-guided stent graft application. However, DSA is associated with significant disadvantages including its invasiveness, the need for potentially nephrotoxic iodine-based contrast agents and exposure to ionizing radiation for patients and clinical staff. Magnetic particle imaging (MPI) is a fast and sensitive tomographic imaging technique that uses magnetic fields to visualize superparamagnetic iron-oxide nanoparticles (SPIONs). The advantages of MPI include the background- and radiation-free visualization of SPION-tracers. The aim of this proof-of-concept study was to demonstrate the potential of MPI for image-guided application of covered stents in a 3D printed realistic aneurysm phantom.
description: International Journal on Magnetic Particle Imaging IJMPI, Vol 9 No 1 Suppl 1 (2023)
Examples of quasitoric manifolds as special unitary manifolds
Creators: name: Lü, Zhi
name: Wang, Wei
Publisher: name: arXiv
Year: 2013
Subjects: subject: Algebraic Topology (math.AT)
subject: FOS: Mathematics

description: This note shows that for each $n\geq 5$ with only $n\not= 6$, there exists a $2n$-dimensional specially omnioriented quasitoric manifold $M^{2n}$ which represents a nonzero element in $Ω_*^U$. This provides the counterexamples of Buchstaber--Panov--Ray conjecture.
description: 10 pages, v3: final version
title: Veröffentlichungen des Landesdenkmalamtes
Creators: name: Redaktion, Die
Publisher: name: University Library Heidelberg
Year: 2014

description: Denkmalpflege in Baden-Württemberg – Nachrichtenblatt der Landesdenkmalpflege, Bd. 14, Nr. 2 (1985), Beginn und Erscheinungsfrequenz: Ausgaben pro Band: 4
Visual boundaries of Diestel-Leader graphs
Creators: name: Jones, Keith
name: Kelsey, Gregory A.
Publisher: name: arXiv
Year: 2013
Subjects: subject: Group Theory (math.GR)
subject: Geometric Topology (math.GT)
subject: FOS: Mathematics
subject: 20F65, 20F69, Secondary 20E22, 05C25

description: Diestel-Leader graphs are neither hyperbolic nor CAT(0), so their visual boundaries may be pathological. Indeed, we show that for $d>2$, $\partial\text{DL}_d(q)$ carries the indiscrete topology. On the other hand, $\partial\text{DL}_2(q)$, while not Hausdorff, is $T_1$, totally disconnected, and compact. Since $\text{DL}_2(q)$ is a Cayley graph of the lamplighter group $L_q$, we also obtain a nice description of $\partial\text{DL}_2(q)$ in terms of the lamp stand model of $L_q$ and discuss the dynamics of the action.
description: 19 pages, 5 figures The substantive changes made in this revision are mostly found in Section 5.1, where we prove that geodesics in $\dl_d(q)$ have at most one "turn"
Evolved eclipsing binary systems in the Galactic bulge: Precise physical and orbital parameters of OGLE-BLG-ECL-305487 and OGLE-BLG-ECL-116218
Creators: name: Suchomska, K.
name: Graczyk, D.
name: Gałan, C.
name: Ziółkowska, O.
name: Smolec, R.
name: Pietrzyński, G.
name: Gieren, W.
name: Villanova, S.
name: Górski, M.
name: Thompson, I. B.
name: Wielgórski, P.
name: Zgirski, B.
name: Karczmarek, P.
name: Pilecki, B.
name: Taormina, M.
name: Narloch, W.
name: Hajdu, G.
name: Lewis, M.
name: Kałuszyński, M.
name: García, G. Rojas
Publisher: name: arXiv
Year: 2022
Subjects: subject: Solar and Stellar Astrophysics (astro-ph.SR)
subject: FOS: Physical sciences

description: Our goal is to determine, with high accuracy, the physical and orbital parameters of two double-lined eclipsing binary systems, where the components are two giant stars. We also aim to study the evolutionary status of the binaries, to derive the distances towards them by using a surface brightness-colour relation, and to compare these measurements with the measurements presented by the Gaia mission. In order to measure the physical and orbital parameters of the systems, we analysed the light curves and radial-velocity curves with the Wilson-Devinney code. We used V band and I-band photometry from the OGLE catalogue and near-infrared photometry obtained with the New Technology Telescope (NTT) equipped with the SOFI instrument. The spectroscopic data were collected with the HARPS spectrograph mounted at the ESO 3.6m telescope and the MIKE spectrograph mounted at the 6.5m Clay telescope. We present the first analysis of this kind for two evolved eclipsing binary systems from the OGLE catalogue: OGLE-BLG-ECL-305487 and OGLE-BLG-ECL-116218. The masses of the components of OGLE-BLG-ECL-305487 are $M_1$ = 1.059 $\pm$ 0.019 and $M_2$ = 0.991 $\pm$ 0.018 $M_\odot$, and the radii are $R_1$ = 19.27 $\pm$ 0.28 and $R_2$ = 29.99 $\pm$ 0.24 R$_\odot$. For OGLE-BLG-ECL-116218, the masses are $M_1$= 0.969 $\pm$ 0.012 and $M_2$= 0.983 $\pm$ 0.012 $M_\odot$, while the radii are $R_1$= 16.73 $\pm$ 0.28 and $R_2$= 22.06 $\pm$ 0.26 $R_\odot$. The evolutionary status of the systems is discussed based on the PARSEC and MIST isochrones. The ages of the systems were established to be between 7.3-10.9 Gyr for OGLE-BLG-ECL-305487 and around 10 Gyr for OGLE-BLG-ECL-116218. We also measured the distances to the binaries. For OGLE-BLG-ECL-305487, $d$= 7.80 $\pm$ 0.18 (stat.) $\pm$ 0.19 (syst.) kpc and for OGLE-BLG-ECL-116218, $d$= 7.57 $\pm$ 0.28 (stat.) $\pm$ 0.19 (syst.) kpc.
description: 12 pages, 5 figures, accepted in A&A
Interaction of Reaction and Internal Fluid Dynamics in Jet Loop Reactors
Creators: name: Breit, Ferdinand
name: Von Harbou, Erik
name: Bey, Oliver
Publisher: name: Zenodo
Year: 2021
Subjects: Jet loop reactor
Compartment model
Reactive multiphase flow
Sensitivity analysis
Stability
one-dimensional model
1D model
multifluid

description: Jet loop reactors are commonly used in various chemical, biological, and environmental processes as multiphase reactors. These reactors utilize a strong liquid jet, generated by a nozzle, to facilitate the internal circulation of both liquid and gas phases, as well as the entrainment and dispersion of the gas phase. We have developed a one-dimensional compartment model, based on a momentum balance, to describe the internal circulation of gas and liquid phases in the jet loop reactor. This model takes into account the effects of local variations in the gas volume fraction, which can arise from gas bubble coalescence, additional gas-feeding points, or gas consumption/production. Our study focused on examining the impact of a gas-consuming reaction on the internal circulation using this model. Through a comprehensive sensitivity analysis, we investigated the interactions between various parameters, such as the rate of reaction, power input through the nozzle, gas holdup, reactor geometry, and circulation rate. The results demonstrate that gas consumption can have a significant effect on internal circulation. We identified industrially relevant operating conditions where the internal circulation can come to a complete standstill.
description: Ferdinand Breit was the presenter.
Statistical Study and Live Catalogue of Multi-Spacecraft 3He-Rich Time Periods over Solar Cycles 23, 24, and 25
Creators: name: Hart, Samuel T.
name: Dayeh, Maher A.
name: Bučík, Radoslav
name: Desai, Mihir I.
name: Ebert, Robert W.
name: Ho, George C.
name: Li, Gang
name: Mason, Glenn M.
Publisher: name: arXiv
Year: 2022
Subjects: subject: Solar and Stellar Astrophysics (astro-ph.SR)
subject: Space Physics (physics.space-ph)
subject: FOS: Physical sciences

description: Using ion measurements from Ultra-Low-Energy Isotope Spectrometer (ULEIS) observations onboard Advanced Composition Explorer (ACE) and Solar Isotope Spectrometer (SIS) observations onboard the Solar Terrestrial Observatory (STEREO)-A and STEREO-B spacecraft, we have identified 854 3He-rich time periods between 1997 September and 2021 March. We include all event types with observed 3He enhancements such as corotating interaction regions (CIRs), gradual solar energetic particle (SEP) events, interplanetary shocks, and impulsive SEP events. We employ two different mass separation techniques to obtain 3He, 4He, Fe, and O fluences for each event, and we determine the 3He/4He and Fe/O abundance ratios between 0.32 to 0.45 MeV/nucleon and 0.64 to 1.28 MeV/nucleon. We find a clear correlation in the 3He/4He and Fe/O abundance ratios between both energy ranges. We find two distinct trends in the 3He/4He vs. Fe/O relation. For low 3He/4He values, there is a positive linear correlation between 3He/4He and Fe/O. However, at 3He/4He ~ 0.3, Fe/O appears to reach a limit and the correlation weakens significantly. We provide a live catalogue of 3He rich time periods that includes the robust determination of the onset and end times of the 3He enhancements in SEP-associated periods for different types of events observed my multiple spacecraft. This catalogue is available for public use. New releases will follow after major additions such as adding new periods from new missions (e.g., Parker Solar Probe and Solar Orbiter), identifying event types (impulsive SEP events, etc.), or adding new parameters such as remote observations detailing characteristics of the active regions.
description: 22 pages, 9 figures, publishing in ApJ Supplemental Series
title: Inhalt
Creators: name: Redaktion, Die
Publisher: name: University Library Heidelberg
Year: 2014

description: Denkmalpflege in Baden-Württemberg – Nachrichtenblatt der Landesdenkmalpflege, Bd. 14, Nr. 3 (1985), Beginn und Erscheinungsfrequenz: Ausgaben pro Band: 4
Development of Optimized Magnetic Particle Imaging Tracers Utilizing Genetically Engineered Magnetosomes
Creators: name: Thieben, Florian
name: Mickoleit, Frank
name: Tessaro, Sophia
name: Ludewig, Peter
name: Schüler, Dirk
name: Garbayo, Javier Rández
name: Uebe, René
name: Knopp, Tobias
Publisher: name: International Journal on Magnetic Particle Imaging IJMPI
Year: 2023

description: The imaging quality of Magnetic Particle Imaging (MPI) is not just limited by the MPI system but also by the quality of available tracers. The tracer quality can be improved by optimizing the shape, core size and shell of the nanoparticles. However, such a defined synthesis is quiet challenging. Biogenic magnetic nanoparticles, so-called magnetosomes, synthesized by magnetotoactic bacteria, might provide a promising alternative. In this study, magnetosomes isolated from different Magnetospirillum gryphiswaldense mutant strains biomineralizing particles with varying core diameters were investigated with regard to their usability as tracers for MPI.
description: International Journal on Magnetic Particle Imaging IJMPI, Vol 9 No 1 Suppl 1 (2023)
Orbital control of effective dimensionality: from spin-orbital fractionalization to confinement in the anisotropic ladder system CaCu2O3
Creators: name: Bisogni, Valentina
name: Wohlfeld, Krzysztof
name: Nishimoto, Satoshi
name: Monney, Claude
name: Trinckauf, Jan
name: Zhou, Kejin
name: Kraus, Roberto
name: Koepernik, Klaus
name: Sekar, Chinnathambi
name: Strocov, Vladimir
name: Buechner, Bernd
name: Schmitt, Thorsten
name: Brink, Jeroen van den
name: Geck, Jochen
Publisher: name: arXiv
Year: 2013
Subjects: subject: Strongly Correlated Electrons (cond-mat.str-el)
subject: FOS: Physical sciences

description: Fractionalization of an electronic quasiparticle into spin, charge and orbital parts is a fundamental and characteristic property of interacting electrons in one dimension. However, real materials are never strictly one-dimensional and the fractionalization phenomena are hard to observe. Here we studied the spin and orbital excitations of the anisotropic ladder material CaCu2O3, whose electronic structure is not one-dimensional. Combining high-resolution resonant inelastic x-ray scattering experiments with theoretical model calculations we show that: (i) spin-orbital fractionalization occurs in CaCu2O3 along the leg direction x through the xz orbital channel as in a 1D system; and (ii) no fractionalization is observed for the xy orbital, which extends in both leg and rung direction, contrary to a 1D system. We conclude that the directional character of the orbital hopping can select different degrees of dimensionality. Using additional model calculations, we show that spin-orbital separation is generally far more robust than the spin-charge separation. This is not only due to the already mentioned selection realized by the orbital hopping, but also due to the fact that spinons are faster than the orbitons.
description: 6 pages, 4 figure
title: Gelbes Fachwerk
Creators: name: Cramer, Johannes
Publisher: name: University Library Heidelberg
Year: 2014

description: Denkmalpflege in Baden-Württemberg – Nachrichtenblatt der Landesdenkmalpflege, Bd. 14, Nr. 3 (1985), Beginn und Erscheinungsfrequenz: Ausgaben pro Band: 4
Polynomial-Time Algorithms for Quadratic Isomorphism of Polynomials: The Regular Case
Creators: name: Berthomieu, Jérémy
name: Faugère, Jean-Charles
name: Perret, Ludovic
Publisher: name: arXiv
Year: 2013
Subjects: subject: Symbolic Computation (cs.SC)
subject: Cryptography and Security (cs.CR)
subject: FOS: Computer and information sciences

description: Let $\mathbf{f}=(f\_1,\ldots,f\_m)$ and $\mathbf{g}=(g\_1,\ldots,g\_m)$ be two sets of $m\geq 1$ nonlinear polynomials over $\mathbb{K}[x\_1,\ldots,x\_n]$ ($\mathbb{K}$ being a field). We consider the computational problem of finding -- if any -- an invertible transformation on the variables mapping $\mathbf{f}$ to $\mathbf{g}$. The corresponding equivalence problem is known as {\tt Isomorphism of Polynomials with one Secret} ({\tt IP1S}) and is a fundamental problem in multivariate cryptography. The main result is a randomized polynomial-time algorithm for solving {\tt IP1S} for quadratic instances, a particular case of importance in cryptography and somewhat justifying {\it a posteriori} the fact that {\it Graph Isomorphism} reduces to only cubic instances of {\tt IP1S} (Agrawal and Saxena). To this end, we show that {\tt IP1S} for quadratic polynomials can be reduced to a variant of the classical module isomorphism problem in representation theory, which involves to test the orthogonal simultaneous conjugacy of symmetric matrices. We show that we can essentially {\it linearize} the problem by reducing quadratic-{\tt IP1S} to test the orthogonal simultaneous similarity of symmetric matrices; this latter problem was shown by Chistov, Ivanyos and Karpinski to be equivalent to finding an invertible matrix in the linear space $\mathbb{K}^{n \times n}$ of $n \times n$ matrices over $\mathbb{K}$ and to compute the square root in a matrix algebra. While computing square roots of matrices can be done efficiently using numerical methods, it seems difficult to control the bit complexity of such methods. However, we present exact and polynomial-time algorithms for computing the square root in $\mathbb{K}^{n \times n}$ for various fields (including finite fields). We then consider \\#{\tt IP1S}, the counting version of {\tt IP1S} for quadratic instances. In particular, we provide a (complete) characterization of the automorphism group of homogeneous quadratic polynomials. Finally, we also consider the more general {\it Isomorphism of Polynomials} ({\tt IP}) problem where we allow an invertible linear transformation on the variables \emph{and} on the set of polynomials. A randomized polynomial-time algorithm for solving {\tt IP} when \(\mathbf{f}=(x\_1^d,\ldots,x\_n^d)\) is presented. From an algorithmic point of view, the problem boils down to factoring the determinant of a linear matrix (\emph{i.e.}\ a matrix whose components are linear polynomials). This extends to {\tt IP} a result of Kayal obtained for {\tt PolyProj}.
description: Published in Journal of Complexity, Elsevier, 2015, pp.39
Line-Graph Approach to Spiral Spin Liquids
Creators: name: Gao, Shang
name: Pokharel, Ganesh
name: May, Andrew F.
name: Paddison, Joseph A. M.
name: Pasco, Chris
name: Liu, Yaohua
name: Taddei, Keith M.
name: Calder, Stuart
name: Mandrus, David G.
name: Stone, Matthew B.
name: Christianson, Andrew D.
Publisher: name: arXiv
Year: 2022
Subjects: subject: Strongly Correlated Electrons (cond-mat.str-el)
subject: Materials Science (cond-mat.mtrl-sci)
subject: FOS: Physical sciences

description: Competition among exchange interactions is able to induce novel spin correlations on a bipartite lattice without geometrical frustration. A prototype example is the spiral spin liquid, which is a correlated paramagnetic state characterized by sub-dimensional degenerate propagation vectors. Here, using spectral graph theory, we show that spiral spin liquids on a bipartite lattice can be approximated by a further-neighbor model on the corresponding line-graph lattice that is non-bipartite, thus broadening the space of candidate materials that may support the spiral spin liquid phases. As illustrations, we examine neutron scattering experiments performed on two spinel compounds, ZnCr$_2$Se$_4$ and CuInCr$_4$Se$_8$, to demonstrate the feasibility of this new approach and expose its possible limitations in experimental realizations.
description: 20 pages, 18 figures
Multi sequence hardware design for rotational drift spectroscopy
Creators: name: Von Boehn, Alexander
name: Rückert, Martin
name: Vogel, Patrick
name: Behr, Volker
Publisher: name: International Journal on Magnetic Particle Imaging IJMPI
Year: 2023

description: Rotational Drift Spectroscopy (RDS) is a novel spectroscopic method for magnetic nanoparticles. It is based on measuring the rotational drift of magnetic nanoparticle ensembles in liquid suspension in a rotating magnetic field, that is below the magnetic field strength necessary for rotating the magnetic nanoparticles synchronously. The resulting asynchronous rotational drift strongly depends on the properties of the magnetic nanoparticles and their environment. This allows for, e.g., detecting specific molecules via functionalized magnetic nanoparticles. The following work presents a compact rotational drift spectroscopy hardware design, which is controllable with python scripts and is especially designed for accommodating various kinds of RDS measurement sequences with differing hardware requirements.
description: International Journal on Magnetic Particle Imaging IJMPI, Vol 9 No 1 Suppl 1 (2023)
Nonempty Intersection of Longest Paths in Series-Parallel Graphs
Creators: name: Ehrenmüller, Julia
name: Fernandes, Cristina G.
name: Heise, Carl Georg
Publisher: name: arXiv
Year: 2013
Subjects: subject: Combinatorics (math.CO)
subject: FOS: Mathematics
subject: 05C38

description: In 1966 Gallai asked whether all longest paths in a connected graph have nonempty intersection. This is not true in general and various counterexamples have been found. However, the answer to Gallai's question is positive for several well-known classes of graphs, as for instance connected outerplanar graphs, connected split graphs, and 2-trees. A graph is series-parallel if it does not contain $K_4$ as a minor. Series-parallel graphs are also known as partial 2-trees, which are arbitrary subgraphs of 2-trees. We present a proof that every connected series-parallel graph has a vertex that is common to all of its longest paths. Since 2-trees are maximal series-parallel graphs, and outerplanar graphs are also series-parallel, our result captures these two classes in one proof and strengthens them to a larger class of graphs. We also describe how this vertex can be found in linear time.
description: 17 pages
title: [Literatur zum Thema Bauaufnahme] Gerda Wangerin: Einführung in die Bauaufnahme. Schriftenreihe des Institutsfür Bau- und Kunstgeschichte der Universität Hannover, Band 4, Hannover 1982, 183 S., zahlreiche Abbildungen
Creators: name: Eckslein, Günter
name: Gromer, Johannes
Publisher: name: University Library Heidelberg
Year: 2014

description: Denkmalpflege in Baden-Württemberg – Nachrichtenblatt der Landesdenkmalpflege, Bd. 14, Nr. 3 (1985), Beginn und Erscheinungsfrequenz: Ausgaben pro Band: 4
Interaction of Reaction and Fluid Dynamics on the Performance of Jet Loop Reactors
Creators: name: Breit, Ferdinand
name: Bey, Oliver
name: Von Harbou, Erik
Publisher: name: Zenodo
Year: 2021
Subjects: Jet Loop Reactors
Interaction of Reaction and Fluid Dynamics
1D Multifluid model
Multiphase reactor
Compartment model
Reactive multiphase flow
Sensitivity analysis
Stability

description: Jet loop reactors are commonly used in various chemical, biological, and environmental processes as multiphase reactors. These reactors utilize a strong liquid jet, generated by a nozzle, to facilitate the internal circulation of both liquid and gas phases, as well as the entrainment and dispersion of the gas phase. We have developed a one-dimensional compartment model, based on a momentum balance, to describe the internal circulation of gas and liquid phases in the jet loop reactor. This model takes into account the effects of local variations in the gas volume fraction, which can arise from gas bubble coalescence, additional gas-feeding points, or gas consumption/production. Our study focused on examining the impact of a gas-consuming reaction on the internal circulation using this model. Through a comprehensive sensitivity analysis, we investigated the interactions between various parameters, such as the rate of reaction, power input through the nozzle, gas holdup, reactor geometry, and circulation rate. The results demonstrate that gas consumption can have a significant effect on internal circulation. We identified industrially relevant operating conditions where the internal circulation can come to a complete standstill.
description: Ferdinand Breit was the presenter.
title: Eröffnungsansprache
Creators: name: Späth, Lothar
Publisher: name: University Library Heidelberg
Year: 2014

description: Denkmalpflege in Baden-Württemberg – Nachrichtenblatt der Landesdenkmalpflege, Bd. 14, Nr. 4 (1985), Beginn und Erscheinungsfrequenz: Ausgaben pro Band: 4
Chemical evolution of elliptical galaxies I: supernovae and AGN feedback
Creators: name: Molero, Marta
name: Matteucci, Francesca
name: Ciotti, Luca
Publisher: name: arXiv
Year: 2022
Subjects: subject: Astrophysics of Galaxies (astro-ph.GA)
subject: FOS: Physical sciences

description: We study the formation and evolution of elliptical galaxies and how they suppress star formation and maintain it quenched. A one-zone chemical model which follows in detail the time evolution of gas mass and its chemical abundances during the active and passive evolution, is adopted. The model includes both gas infall and outflow as well as detailed stellar nucleosynthesis. Elliptical galaxies with different infall masses, following a down-sizing in star formation scenario, are considered. In the chemical evolution simulation we include a novel calculation of the feedback processes. We include heating by stellar wind, core-collapse SNe, Type Ia SNe (usually not highlighted in galaxy formation simulations) and AGN feedback. The AGN feedback is a novelty in this kind of models and is computed by considering a Bondi-Eddington limited accretion onto the central supermassive black hole. We successfully reproduce several observational features, such as the [$α$/Fe] ratios increasing with galaxy mass, mass-metallicity, $\rm M_{BH}-σ$ and $\rm M_{BH}-M_{*}$ relations. Moreover, we show that stellar feedback and in particular Type Ia SNe, has a main role in maintaining quenched the star formation after the occurrence of the main galactic wind, especially in low-mass ellipticals. For larger systems, the contribution from AGN to thermal energy of gas appears to be necessary. However, the effect of the AGN on the development of the main galactic wind is negligible, unless an unreasonable high AGN efficiency or an extremely low stellar feedback are assumed. We emphasize the important role played by Type Ia SNe in the energy budget of early-type galaxies.
description: 15 pages, 10 figures, Accepted on MNRAS
title: [Tagungsberichte] Tagung des „Studienkreises für Geschichte des Wasserbaus, der Wasserwirtschaft und der Hydrologie“ 20. bis 23. September 2001 in Wangen/Allgäu
Creators: name: Fromm-Kaupp, Iris
Publisher: name: University Library Heidelberg
Year: 2014

description: Denkmalpflege in Baden-Württemberg – Nachrichtenblatt der Landesdenkmalpflege, Bd. 31, Nr. 1 (2002), Beginn und Erscheinungsfrequenz: Ausgaben pro Band: 4
A tight Gaussian bound for weighted sums of Rademacher random variables
Creators: name: Bentkus, Vidmantas Kastytis
name: Dzindzalieta, Dainius
Publisher: name: arXiv
Year: 2013
Subjects: subject: Probability (math.PR)
subject: FOS: Mathematics

description: Let $\varepsilon_1,\ldots,\varepsilon_n$ be independent identically distributed Rademacher random variables, that is $\mathbb{P}\{\varepsilon_i=\pm1\}=1/2$. Let $S_n=a_1\varepsilon_1+\cdots+a_n\varepsilon_n$, where $\mathbf{a}=(a_1,\ldots,a_n)\in\mathbb{R}^n$ is a vector such that ${a_1^2+\cdots+a_n^2\leq1}$. We find the smallest possible constant $c$ in the inequality \[\mathbb{P}\{S_n\geq x\}\leq c\mathbb{P}\{η\geq x\}\qquad for all x\in \mathbb{R},\] where $η\sim N(0,1)$ is a standard normal random variable. This optimal value is equal to \[c_*=\bigl(4\mathbb{P}\{η\geq\sqrt{2}\}\bigr)^ {-1}\approx3.178.\]
description: Published at http://dx.doi.org/10.3150/14-BEJ603 in the Bernoulli (http://isi.cbs.nl/bernoulli/) by the International Statistical Institute/Bernoulli Society (http://isi.cbs.nl/BS/bshome.htm)
title: Die Stahlgussglocken der evangelischen Auferstehungskirche in Karlsruhe-Rüppurr. Ersatz für Bronzeglocken?
Creators: name: Blumer, Rolf-Dieter
name: Fahrbach-Dreher, Ute
name: Kinder, Joachim
name: Masen, Lisa
name: Plitzner, Michael
name: Rupp, Andreas
Publisher: name: University Library Heidelberg
Year: 2014

description: Denkmalpflege in Baden-Württemberg – Nachrichtenblatt der Landesdenkmalpflege, Bd. 43, Nr. 4 (2014), Beginn und Erscheinungsfrequenz: Ausgaben pro Band: 4
A Preadapted Universal Switch Distribution for Testing Hilberg's Conjecture
Creators: name: Dębowski, Łukasz
Publisher: name: arXiv
Year: 2013
Subjects: subject: Information Theory (cs.IT)
subject: Computation and Language (cs.CL)
subject: FOS: Computer and information sciences
subject: E.4
subject: 68P30, 94A45

description: Hilberg's conjecture about natural language states that the mutual information between two adjacent long blocks of text grows like a power of the block length. The exponent in this statement can be upper bounded using the pointwise mutual information estimate computed for a carefully chosen code. The bound is the better, the lower the compression rate is but there is a requirement that the code be universal. So as to improve a received upper bound for Hilberg's exponent, in this paper, we introduce two novel universal codes, called the plain switch distribution and the preadapted switch distribution. Generally speaking, switch distributions are certain mixtures of adaptive Markov chains of varying orders with some additional communication to avoid so called catch-up phenomenon. The advantage of these distributions is that they both achieve a low compression rate and are guaranteed to be universal. Using the switch distributions we obtain that a sample of a text in English is non-Markovian with Hilberg's exponent being $\le 0.83$, which improves over the previous bound $\le 0.94$ obtained using the Lempel-Ziv code.
description: 17 pages, 3 figures
Single-Pass Relaxation Mapping at Multiple Frequencies Using an Arbitrary Waveform MPI Scanner
Creators: name: Alyuz, Beril
name: Arslan, Musa Tunc
name: Utkur, Mustafa
name: Saritas, Emine Ulku
Publisher: name: International Journal on Magnetic Particle Imaging IJMPI
Year: 2023

description: In Magnetic Particle Imaging (MPI), relaxation behavior of magnetic nanoparticles (MNPs) has enabled the inference of information about different MNP types and their local environments, such as viscosity and temperature. Previously, we have proposed and demonstrated an arbitrary waveform (AW) MPI scanner that facilitates operation in a wide range of drive field (DF) frequencies by eliminating the need for impedance matching. In this work, we propose a technique for simultaneous relaxation mapping at multiple DF frequencies in a single pass using an AW MPI scanner.
description: International Journal on Magnetic Particle Imaging IJMPI, Vol 9 No 1 Suppl 1 (2023)
Fourier Methods for Harmonic Scalar Waves in General Waveguides
Creators: name: Andersson, Anders
name: Nilsson, Borje
name: Biro, Thomas
Publisher: name: arXiv
Year: 2013
Subjects: subject: Mathematical Physics (math-ph)
subject: FOS: Physical sciences

description: A set of semi-analytical techniques based on Fourier analysis is used to solve wave scattering problems in variously shaped waveguides with varying normal admittance boundary conditions. Key components are newly developed conformal mapping methods, wave splitting, Fourier series expansions in eigen-functions to non-normal operators, the building block method or the cascade technique, Dirichlet-to-Neumann operators, and reformulation in terms of stable differential equations for reflection and transmission matrices. For an example the results show good correspondence with a finite element method solution to the same problem in the low and medium frequency domain. The Fourier method complements finite element analysis as a waveguide simulation tool. For inverse engineering involving tuning of straight waveguide parts joining complicated waveguide elements, the Fourier method is an attractive alternative including time aspects. The prime motivation for the Fourier method is its added physical understanding primarily at low frequencies.
On the Bayes-optimality of F-measure maximizers
Creators: name: Waegeman, Willem
name: Dembczynski, Krzysztof
name: Jachnik, Arkadiusz
name: Cheng, Weiwei
name: Hullermeier, Eyke
Publisher: name: arXiv
Year: 2013
Subjects: subject: Machine Learning (stat.ML)
subject: Machine Learning (cs.LG)
subject: FOS: Computer and information sciences

description: The F-measure, which has originally been introduced in information retrieval, is nowadays routinely used as a performance metric for problems such as binary classification, multi-label classification, and structured output prediction. Optimizing this measure is a statistically and computationally challenging problem, since no closed-form solution exists. Adopting a decision-theoretic perspective, this article provides a formal and experimental analysis of different approaches for maximizing the F-measure. We start with a Bayes-risk analysis of related loss functions, such as Hamming loss and subset zero-one loss, showing that optimizing such losses as a surrogate of the F-measure leads to a high worst-case regret. Subsequently, we perform a similar type of analysis for F-measure maximizing algorithms, showing that such algorithms are approximate, while relying on additional assumptions regarding the statistical distribution of the binary response variables. Furthermore, we present a new algorithm which is not only computationally efficient but also Bayes-optimal, regardless of the underlying distribution. To this end, the algorithm requires only a quadratic (with respect to the number of binary responses) number of parameters of the joint distribution. We illustrate the practical performance of all analyzed methods by means of experiments with multi-label classification problems.
title: Andreas Haasis-Berner: Der Gewerbekanal von Waldkirch. Zur Nutzung von Wasser und Wasserkraft in Mittelalter und Neuzeit. Hg. v. Heimat- und Geschichtsverein Waldkirch e.V. Waldkirch 2014
Creators: name: Jenisch, Bertram
Publisher: name: University Library Heidelberg
Year: 2014

description: Denkmalpflege in Baden-Württemberg – Nachrichtenblatt der Landesdenkmalpflege, Bd. 43, Nr. 4 (2014), Beginn und Erscheinungsfrequenz: Ausgaben pro Band: 4
A 1D Combined Multifluid-Population Balance Model for the Simulation of Batch Bubble Columns
Creators: name: Breit, Ferdinand
name: Mühlbauer, Adam
name: Von Harbou, Erik
name: Hlawitschka, Mark
name: Hans-Jörg Bart
Publisher: name: Zenodo
Year: 2021
Subjects: Population balance equation
PBE
Bubble column
1D multifluid model
scale-up and optimization
bubble size distribution
OMOP

description: Bubble columns are widely used as multiphase reactors for gas-liquid reactions in industrial applications. It is important for the design engineer to be able to determine the general influence of the geometry (e.g. diameter and height) and the process conditions (e.g. power input, feed rates) on the behavior of the reactor at an early stage of process development. In this case, it means that models are required that can describe the interaction between the internal fluid dynamics (phase velocities), the thermodynamic properties of the mixtures and the behavior of the dispersed gas phase (e.g. break-up and coalescence of bubbles). To enable the use of these models for sensitivity and design studies, the computation must be fast and at the same time the results must be able to reliably predict the general trends of the reactor behavior. A suitable candidate for that purpose is the kinetic theory approach with size resolution (KTAWSR). This approach combines a multifluid model, which describe the internal fluid dynamics, with a population balance equation model, which describe the behavior of the dispersed gas phase. A steady-state and one-dimensional version of the KTAWSR model was used and extended to batch bubble columns. For this purpose, a new approach for the determination of the integral gas holdup was developed which does not require additional empirical correlations. Different breakage and coalescence model combinations were calibrated by moments of bubble size distributions that were measured in a laboratory column for the system air-water. To validate the model, the integral gas holdup and the bubble size distribution were measured at four axial positions at three different gas volume fluxes reaching the transition regime. The simulation results show that the novel integral gas holdup calculation approach can predicate the experimental data reliably. Thus, the presented method is well-suited to study the general behavior of bubble columns and gives insights into the process that are important for a reliable design and scale-up.
description: Ferdinand Breit was the presenter.
Evidence for an anomalous current phase relation in topological insulator Josephson junctions
Creators: name: Kurter, C.
name: Finck, A. D. K.
name: Hor, Y. S.
name: Van Harlingen, D. J.
Publisher: name: arXiv
Year: 2013
Subjects: subject: Mesoscale and Nanoscale Physics (cond-mat.mes-hall)
subject: Superconductivity (cond-mat.supr-con)
subject: FOS: Physical sciences

description: Josephson junctions with topological insulator weak links can host low energy Andreev bound states giving rise to a current phase relation that deviates from sinusoidal behaviour. Of particular interest are zero energy Majorana bound states that form at a phase difference of $π$. Here we report on interferometry studies of Josephson junctions and superconducting quantum interference devices (SQUIDs) incorporating topological insulator weak links. We find that the nodes in single junction diffraction patterns and SQUID oscillations are lifted and independent of chemical potential. At high temperatures, the SQUID oscillations revert to conventional behaviour, ruling out asymmetry. The node lifting of the SQUID oscillations is consistent with low energy Andreev bound states exhibiting a nonsinusoidal current phase relation, coexisting with states possessing a conventional sinusoidal current phase relation. However, the finite nodal currents in the single junction diffraction pattern suggest an anomalous contribution to the supercurrent possibly carried by Majorana bound states, although we also consider the possibility of inhomogeneity.
description: 6 pages, 4 figures
WALLABY Pre-Pilot and Pilot Survey: the Tully Fisher Relation in Eridanus, Hydra, Norma and NGC4636 fields
Creators: name: Courtois, Hélène M.
name: Said, Khaled
name: Mould, Jeremy
name: Jarrett, T. H.
name: Pomarède, Daniel
name: Westmeier, Tobias
name: Staveley-Smith, Lister
name: Dupuy, Alexandra
name: Hong, Tao
name: Guinet, Daniel
name: Howlett, Cullan
name: Deg, Nathan
name: For, Bi-Qing
name: Kleiner, Dane
name: Koribalski, Bärbel
name: Lee-Waddell, Karen
name: Rhee, Jonghwan
name: Spekkens, Kristine
name: Wang, Jing
name: Wong, O. I.
name: Bigiel, Frank
name: Bosma, Albert
name: Colless, Matthew
name: Davis, Tamara
name: Holwerda, Benne
name: Karachentsev, Igor
name: Kraan-Korteweg, Renée C.
name: McQuinn, Kristen B. W.
name: Meurer, Gerhardt
name: Obreschkow, Danail
name: Taylor, Edward
Publisher: name: arXiv
Year: 2022
Subjects: subject: Astrophysics of Galaxies (astro-ph.GA)
subject: Cosmology and Nongalactic Astrophysics (astro-ph.CO)
subject: FOS: Physical sciences

description: The WALLABY pilot survey has been conducted using the Australian SKA Pathfinder (ASKAP). The integrated 21-cm HI line spectra are formed in a very different manner compared to usual single-dish spectra Tully-Fisher measurements. It is thus extremely important to ensure that slight differences (e.g. biases due to missing flux) are quantified and understood in order to maximise the use of the large amount of data becoming available soon. This article is based on four fields for which the data are scientifically interesting by themselves. The pilot data discussed here consist of 614 galaxy spectra at a rest wavelength of 21cm. Of these spectra, 472 are of high enough quality to be used to potentially derive distances using the Tully-Fisher relation. We further restrict the sample to the 251 galaxies whose inclination is sufficiently close to edge-on. For these, we derive Tully-Fisher distances using the deprojected WALLABY velocity widths combined with infrared (WISE W1) magnitudes. The resulting Tully-Fisher distances for the Eridanus, Hydra, Norma and NGC 4636 clusters are 21.5, 53.5, 69.4 and 23.0 Mpc respectively, with uncertainties of 5--10\%, which are better or equivalent to the ones obtained in studies using data obtained with giant single dish telescopes. The pilot survey data show the benefits of WALLABY over previous giant single-dish telescope surveys. WALLABY is expected to detect around half a million galaxies with a mean redshift of $z = 0.05 (200 Mpc)$. This study suggests that about 200,000 Tully-Fisher distances might result from the survey.
description: 21 pages, 12 Figures, 6 Tables, accepted for publication in the MNRAS
Estimates of transition densities and their derivatives for jump Lévy processes
Creators: name: Kaleta, Kamil
name: Sztonyk, Paweł
Publisher: name: arXiv
Year: 2013
Subjects: subject: Probability (math.PR)
subject: Functional Analysis (math.FA)
subject: FOS: Mathematics
subject: Primary 60G51, 60E07, Secondary 60J35, 47D03, 60J45

description: We give upper and lower estimates of densities of convolution semigroups of probability measures under explicit assumptions on the corresponding Levy measure and the Levy--Khinchin exponent. We obtain also estimates of derivatives of densities.
description: to appear in Journal of Mathematical Analysis and Applications
Multiple Stellar Populations of Globular Clusters From Homogeneous Ca-CN-CH-NH Photometry. VII. Metal-Poor Populations in 47 Tucanae (NGC 104)
Creators: name: Lee, Jae-Woo
Publisher: name: arXiv
Year: 2022
Subjects: subject: Astrophysics of Galaxies (astro-ph.GA)
subject: Solar and Stellar Astrophysics (astro-ph.SR)
subject: FOS: Physical sciences

description: We present new large field-of-view ($\sim$1°$\times$1°) Ca-CN photometry of the prototypical metal-rich globular cluster 47 Tucanae (NGC 104). Our results are the following. (1) The populational number ratios of the red giant branch (RGB) and red horizontal branch (RHB) are in excellent agreement: n(CN-w):n(CN-s) = 30:70 ($\pm$1--2), where the CN-w and CN-s stand for the CN-weak and CN-strong populations, respectively. Both the CN-s RGB and RHB populations are more centrally concentrated than those of CN-w populations are. (2) Our photometric metallicities of individual RGB stars in each population can be well described by bimodal distributions with two metallicity peaks, [Fe/H] $\sim$ $-$0.72 and $-$0.92 dex, where the metal-poor components occupy $\sim$ 13% of the total RGB stars. The metal-poor populations are more significantly centrally concentrated than the metal-rich populations, showing a similar result that we found in M3. (3) The RGB bump $V$ magnitudes of individual populations indicate that there is no difference in the helium abundance between the two metal-poor populations, while the helium enhancement of $ΔY$ $\sim$ 0.02--0.03 is required between the the two metal-rich populations. (4) The RHB morphology of 47 Tuc appears to support our idea of the bimodal metallicity distribution of the cluster. We suggest that 47 Tuc could be another example of merger remnants of two globular clusters, similar to M3 and M22.
description: Accepted for publication in the Astrophysical Journal Supplement (18 Figures and 9 Tables)
A generalized back-door criterion
Creators: name: Maathuis, Marloes H.
name: Colombo, Diego
Publisher: name: arXiv
Year: 2013
Subjects: subject: Methodology (stat.ME)
subject: Artificial Intelligence (cs.AI)
subject: FOS: Computer and information sciences

description: We generalize Pearl's back-door criterion for directed acyclic graphs (DAGs) to more general types of graphs that describe Markov equivalence classes of DAGs and/or allow for arbitrarily many hidden variables. We also give easily checkable necessary and sufficient graphical criteria for the existence of a set of variables that satisfies our generalized back-door criterion, when considering a single intervention and a single outcome variable. Moreover, if such a set exists, we provide an explicit set that fulfills the criterion. We illustrate the results in several examples. R-code is available in the R-package pcalg.
description: Published at http://dx.doi.org/10.1214/14-AOS1295 in the Annals of Statistics (http://www.imstat.org/aos/) by the Institute of Mathematical Statistics (http://www.imstat.org)