cometadata/datacite-rtg-text-other-reclassification-records huggingface dataset:
Network farthest-point diagrams
Creators: name: Bose, Prosenjit
name: Dannies, Kai
name: De Carufel, Jean-Lou
name: Doell, Christoph
name: Grimm, Carsten
name: Maheshwari, Anil
name: Schirra, Stefan
name: Smid, Michiel
Publisher: name: Journal of Computational Geometry
Year: 2013

description: Consider the continuum of points along the edges of a network, i.e., an undirected graph with positive edge weights. We measure distance between these points in terms of the shortest path distance along the network, known as the network distance. Within this metric space, we study farthest points. We introduce network farthest-point diagrams, which capture how the farthest points---and the distance to them---change as we traverse the network. We preprocess a network G such that, when given a query point q on G, we can quickly determine the farthest point(s) from q in G as well as the farthest distance from q in G. Furthermore, we introduce a data structure supporting queries for the parts of the network that are farther away from q than some threshold R > 0, where R is part of the query. We also introduce the minimum eccentricity feed-link problem defined as follows. Given a network G with geometric edge weights and a point p that is not on G, connect p to a point q on G with a straight line segment pq, called a feed-link, such that the largest network distance from p to any point in the resulting network is minimized. We solve the minimum eccentricity feed-link problem using eccentricity diagrams. In addition, we provide a data structure for the query version, where the network G is fixed and a query consists of the point p.
description: Journal of Computational Geometry, Vol. 4 No. 1 (2013)
Theologie und Spiritualität im Raum des Mundanen
Creators: name: Eggensperger, Thomas
Publisher: name: Jahrbuch für Christliche Sozialwissenschaften
Year: 2022

description: Der Beitrag untersucht das Verhältnis der christlichen Sozialethik zu Theologie und Spiritualität innerhalb des Raums des Mundanen (als Alternativbegriff zum Raum des Öffentlichen). Dazu werden drei Thesen formuliert und ausgeführt. Erstens ist eine theologische Sozialethik ohne spirituellen Impetus nicht sinnstiftend, so wie Spiritualität ohne soziale (sozialethische) Bezüge nicht sinnvoll ist. Zweitens wird gezeigt, dass der Ort des Spirituellen im Raum des Öffentlichen, d. h. in der Sphäre des sozialen Umgangs miteinander, zu finden ist. Drittens wird vorgeschlagen, anstelle vom Raum des Öffentlichen, um der besseren Einordnung willen, die Beschreibung des Raums als einen des Mundanen zu verwenden, wird doch damit die Charakteristik des Raums präziser. Der Ort des Spirituellen ist der Raum des Mundanen, d. h. der Raum einer Kommunikation mit sich überschneidenden und nicht voneinander separierbaren Wert- und Glaubensvorstellungen. Die Konkretionen des spiritual care oder auch der Work-Life- Balance zeigen, wie praktisch Spiritualität sein kann, d. h. wie sehr sie sich nicht nur auf sich selbst, sondern auch auf den Anderen bezieht. Die Gesamtdisziplin Theologie ist relevanter Bezugspunkt der Sozialethik und umgekehrt. Dies wird paradigmatisch am ekklesiologischen Communio Gedanken skizziert, der über den klassischen Volk-Gottes- Begriff (ad intra) hinaus als communio in und mit der Welt (ad extra) zu deuten ist.
description: Jahrbuch für Christliche Sozialwissenschaften, Bd. 63 (2022): Christliche Sozialethik – eine sozialwissenschaftliche und theologische Disziplin
On affine rigidity
Creators: name: Gortler, Steven J.
name: Gotsman, Craig
name: Liu, Ligang
name: Thurston, Dylan P.
Publisher: name: Journal of Computational Geometry
Year: 2013

description: We study the properties of affine rigidity of a hypergraph and prove a variety of fundamental results. First, we show that affine rigidity is a generic property (i.e., depends only on the hypergraph, not the particular embedding). Then we prove that a graph is generically neighborhood affinely rigid in d-dimensional space if it is (d+1)-vertex-connected. We also show neighborhood affine rigidity of a graph implies universal rigidity of its squared graph. Our results, and affine rigidity more generally, have natural applications in point registration and localization, as well as connections to manifold learning.
description: Journal of Computational Geometry, Vol. 4 No. 1 (2013)
Can ChatGPT implement finite element models for geotechnical engineering applications?
Creators: name: Kim, Taegu
name: Yun, Tae Sup
name: Suh, Hyoung Suk
Publisher: name: arXiv
Year: 2025
Subjects: subject: Numerical Analysis (math.NA)
subject: Artificial Intelligence (cs.AI)
subject: FOS: Mathematics
subject: FOS: Computer and information sciences

description: This study assesses the capability of ChatGPT to generate finite element code for geotechnical engineering applications from a set of prompts. We tested three different initial boundary value problems using a hydro-mechanically coupled formulation for unsaturated soils, including the dissipation of excess pore water pressure through fluid mass diffusion in one-dimensional space, time-dependent differential settlement of a strip footing, and gravity-driven seepage. For each case, initial prompting involved providing ChatGPT with necessary information for finite element implementation, such as balance and constitutive equations, problem geometry, initial and boundary conditions, material properties, and spatiotemporal discretization and solution strategies. Any errors and unexpected results were further addressed through prompt augmentation processes until the ChatGPT-generated finite element code passed the verification/validation test. Our results demonstrate that ChatGPT required minimal code revisions when using the FEniCS finite element library, owing to its high-level interfaces that enable efficient programming. In contrast, the MATLAB code generated by ChatGPT necessitated extensive prompt augmentations and/or direct human intervention, as it involves a significant amount of low-level programming required for finite element analysis, such as constructing shape functions or assembling global matrices. Given that prompt engineering for this task requires an understanding of the mathematical formulation and numerical techniques, this study suggests that while a large language model may not yet replace human programmers, it can greatly assist in the implementation of numerical models.
Simplicial flat norm with scale
Creators: name: Ibrahim, Sharif
name: Krishnamoorthy, Bala
name: Vixie, Kevin
Publisher: name: Journal of Computational Geometry
Year: 2013

description: We study the multiscale simplicial flat norm (MSFN) problem, which computes flat norm at various scales of sets defined as oriented subcomplexes of finite simplicial complexes in arbitrary dimensions. We show that MSFN is NP-complete when homology is defined over integers. We cast MSFN as an instance of integer linear optimization. Following recent results on related problems, the MSFN integer program can be solved in polynomial time by solving its linear programming relaxation, when the simplicial complex satisfies a simple topological condition (absence of relative torsion). Our most significant contribution is the simplicial deformation theorem, which states that one may approximate a general current with a simplicial current while bounding the expansion of its mass. We present explicit bounds on the quality of this approximation, which indicate that the simplicial current gets closer to the original current as we make the simplicial complex finer. MSFN opens up the possibilities of using flat norm to denoise or extract scale information of large data sets in arbitrary dimensions. On the other hand, it allows one to employ the large body of algorithmic results on simplicial complexes to address more general problems related to currents.
description: Journal of Computational Geometry, Vol. 4 No. 1 (2013)
Electronic Structures and Phonon Spectra in Boronitride Superconductors LaMBN (M= Ni, Pt)
Creators: name: Jung, Myung-Chul
name: Kang, Chang-Jong
name: Min, B. I.
name: Lee, K. -W.
Publisher: name: arXiv
Year: 2013
Subjects: subject: Superconductivity (cond-mat.supr-con)
subject: FOS: Physical sciences

description: We have investigated electronic structures and phonon spectra of newly discovered isostructural superconductors LaNiBN (T_c = 4.1 K) and LaPtBN (T_c = 6.7 K). We have found that their electronic structures are substantially three-dimensional, leading to metallicity both in NiB (PtB) and the intervening LaN layers. Our ab initio phonon calculations show that almost all phonon modes contribute to the electron-phonon coupling (EPC) mechanism, reflecting that both layers are involved in the superconductivity. For LaNiBN, we obtain an EPC strength of λ= 0.52 and a logarithmically averaged characteristic phonon frequency of ω_{log} = 376 K, leading to T_c = 3.9 K. Compared with the Ni B_{1g} mode in LaNiBN, the Pt B_{1g} mode in LaPtBN is reduced by ~70%, leading to a slightly enhanced λ= 0.56 and an ~20 % reduced ω_{log}. The estimated T_c is 5.4 K for LaPtBN, in good agreement with the experiment. We do not find any indication of magnetic instability for either LaNiBN or LaPtBN, which implies that both systems are EPC mediated superconductors. Further, we have found an interesting trend of monotonic increase of T_c with respect to the boron height in the NiB (PtB) layer of both borocarbide and boronitride superconductors, which suggests a possible way to enhance T_c in these systems.
description: 8 pages
Worst-case and smoothed analysis of k-means clustering with Bregman divergences
Creators: name: Manthey, Bodo
name: Roeglin, Heiko
Publisher: name: Journal of Computational Geometry
Year: 2013

description: The k-means method is the method of choice for clustering large-scale data sets and it performs exceedingly well in practice despite its exponential worst-case running-time. To narrow the gap between theory and practice, k-means has been studied in the semi-random input model of smoothed analysis, which often leads to more realistic conclusions than mere worst-case analysis. For the case that n data points in Rd are perturbed by Gaussian noise with standard deviation σ, it has been shown that the expected running-time is bounded by a polynomial in n and 1/σ. This result assumes that squared Euclidean distances are used as the distance measure. In many applications, however, data is to be clustered with respect to Bregman divergences rather than squared Euclidean distances. A prominent example is the Kullback-Leibler divergence (a.k.a. relative entropy) that is commonly used to cluster web pages. To broaden the knowledge about this important class of distance measures, we analyze the running-time of the k-means method for Bregman divergences. We first give a smoothed analysis of k-means with (almost) arbitrary Bregman divergences, and we show bounds of poly(n√k, 1/σ) and kkd·poly(n, 1/σ). The latter yields a polynomial bound if k and d are small compared to n. On the other hand, we show that the exponential lower bound carries over to a huge class of Bregman divergences.
description: Journal of Computational Geometry, Vol. 4 No. 1 (2013)
Valley-mediated singlet- and triplet-polaron interactions and quantum dynamics in a doped WSe$_2$ monolayer
Creators: name: Ni, Yue
name: Huang, Di
name: Liang, Danfu
name: Liu, Albert
name: Liu, Xiaohui
name: Sampson, Kevin
name: Liu, Zhida
name: Quan, Jianmin
name: Watanabe, Kenji
name: Taniguchi, Takashi
name: Efimkin, Dmitry K.
name: Levinsen, Jesper
name: Parish, Meera M.
name: Li, Xiaoqin
Publisher: name: arXiv
Year: 2025
Subjects: subject: Mesoscale and Nanoscale Physics (cond-mat.mes-hall)
subject: FOS: Physical sciences

description: In doped transition metal dichalcogenides, optically created excitons (bound electron-hole pairs) can strongly interact with a Fermi sea of electrons to form Fermi polaron quasiparticles. When there are two distinct Fermi seas, as is the case in WSe$_2$, there are two flavors of lowest-energy (attractive) polarons -- singlet and triplet -- where the exciton is coupled to the Fermi sea in the same or opposite valley, respectively. Using two-dimensional coherent electronic spectroscopy, we analyze how their quantum decoherence evolves with doping density and determine the condition under which stable Fermi polarons form. Because of the large oscillator strength associated with these resonances, intrinsic quantum dynamics of polarons as well as valley coherence between coupled singlet- and triplet polarons occur on sub-picosecond time scales. Surprisingly, we find that a dark-to-bright state conversion process leads to a particularly long-lived singlet polaron valley polarization, persisting up to 200-800 ps. Valley coherence between the singlet- and triplet polaron is correlated with their energy fluctuations. Our finding provides valuable guidance for the electrical and optical control of spin and valley indexes in atomically thin semiconductors.
description: 4 pages, 4 figures
Metric inequalities for polygons
Creators: name: Dumitrescu, Adrian
Publisher: name: Journal of Computational Geometry
Year: 2013

description: Let A1,A2,…,An be the vertices of a polygon with unit perimeter, that is Σi |Ai Ai+1|=1. We derive various tight estimates on the minimum and maximum values of the sum of pairwise distances, and respectively sum of pairwise squared distances among its vertices. In most cases such estimates on these sums in the literature were known only for convex polygons. In the second part, we turn to a problem of Braß regarding the maximum perimeter of a simplen-gon (n odd) contained in a disk of unit radius. The problem was recently solved by Audet et al. 2009, who gave an exact formula. Here we present an alternative simpler proof of this formula. We then examine what happens if the simplicity condition is dropped, and obtain an exact formula for the maximum perimeter in this case as well.
description: Journal of Computational Geometry, Vol. 4 No. 1 (2013)
Stability and metastability of clusters in a reactive atmosphere: theoretical evidence for unexpected stoichiometries of MgMOx
Creators: name: Bhattacharya, Saswata
name: Levchenko, Sergey V.
name: Ghiringhelli, Luca M.
name: Scheffler, Matthias
Publisher: name: arXiv
Year: 2013
Subjects: subject: Materials Science (cond-mat.mtrl-sci)
subject: FOS: Physical sciences

description: By applying a genetic algorithm in a cascade approach of increasing accuracy, we calculate the composition and structure of MgMOx clusters at realistic temperatures and oxygen pressures. The stable and metastable systems are identified by ab initio atomistic thermodynamics. We find that small clusters (M <= 5) are in thermodynamic equilibrium when x > M. The non-stoichiometric clusters exhibit peculiar magnetic behavior, suggesting the possibility of tuning magnetic properties by changing environmental pressure and temperature conditions. Furthermore, we show that density-functional theory (DFT) with a hybrid exchange-correlation (xc) functional is needed for predicting accurate phase diagrams of metal-oxide clusters. Neither a (sophisticated) force field nor DFT with (semi)local xc functionals are sufficient for even a qualitative prediction.
description: 5 pages, 3 Figures, Supporting Information
Observational Upper Bound on the Cosmic Abundances of Negative-mass Compact Objects and Ellis Wormholes from the Sloan Digital Sky Survey Quasar Lens Search
Creators: name: Takahashi, Ryuichi
name: Asada, Hideki
Publisher: name: arXiv
Year: 2013
Subjects: subject: Cosmology and Nongalactic Astrophysics (astro-ph.CO)
subject: General Relativity and Quantum Cosmology (gr-qc)
subject: FOS: Physical sciences

description: The latest result in the Sloan Digital Sky Survey Quasar Lens Search (SQLS) has set the first cosmological constraints on negative-mass compact objects and Ellis wormholes. There are no multiple images lensed by the above two exotic objects for $\sim 50000$ distant quasars in the SQLS data. Therefore, an upper bound is put on the cosmic abundances of these lenses. The number density of negative mass compact objects is $n<10^{-8} (10^{-4}) h^3 {\rm Mpc}^{-3}$ at the mass scale $|M| > 10^{15} (10^{12}) M_\odot$, which corresponds to the cosmological density parameter $|Ω| < 10^{-4}$ at the galaxy-scale mass range $|M|=10^{12-15}M_\odot$. The number density of the Ellis wormhole is $n<10^{-4} h^3 {\rm Mpc}^{-3}$ for a range of the throat radius $a = 10^{1-4}$pc, which is much smaller than the Einstein ring radius.
description: 5 pages, 3 figures, minor changes, some references added, accepted for publication in ApJL
Delayed feedback control of unstable steady states with high-frequency modulation of the delay
Creators: name: Gjurchinovski, Aleksandar
name: Jüngling, Thomas
name: Urumov, Viktor
name: Schöll, Eckehard
Publisher: name: arXiv
Year: 2013
Subjects: subject: Chaotic Dynamics (nlin.CD)
subject: FOS: Physical sciences

description: We analyze the stabilization of unstable steady states by delayed feedback control with a periodic time-varying delay in the regime of a high-frequency modulation of the delay. The average effect of the delayed feedback term in the control force is equivalent to a distributed delay in the interval of the modulation, and the obtained distribution depends on the type of the modulation. In our analysis we use a simple generic normal form of an unstable focus, and investigate the effects of phase-dependent coupling and the influence of the control loop latency on the controllability. In addition, we have explored the influence of the modulation of the delays in multiple delay feedback schemes consisting of two independent delay lines of Pyragas type. A main advantage of the variable delay is the considerably larger domain of stabilization in parameter space.
description: 17 pages, 16 figures, RevTeX, additional section on multiple delay feedback control added
Postkoloniale Kritik als immanente Modernekritik?
Creators: name: Winkler, Katja
Publisher: name: Jahrbuch für Christliche Sozialwissenschaften
Year: 2022

description: Aktuell werden die Kritische Theorie und einzelne ihrer Theoriebausteine in der Theologischen Sozialethik vermehrt aufgegriffen. Im Folgenden wird versucht, Postkoloniale Theorie als eine Art Kritische Theorie ins theologisch-sozialethische Gespräch zu bringen. Dies kann womöglich zum einen den Eurozentrismusvorwurf gegenüber der klassischen Kritischen Theorie – welcher Generation auch immer – abmildern. Zum anderen kann dadurch vor allem dazu beigetragen werden, dass das Konzept der Subalternität als zentrales kritisches Konzept in der Theologischen Sozialethik Berücksichtigungfindet. Im Text wird die Position Gayatri Chakravorty Spivaks, insbesondere ihre Menschenrechtskritik, vorgestellt und mit der immanenten Modernekritik in Verbindung gebracht. Dabei wird die postkoloniale Perspektive deutlich von einem Kulturrelativismus abgegrenzt, mit dem sie immer wieder vermischt wird. Schließlich wird die Notwendigkeit der Selbstkritik für die Theologische Sozialethik als Wissenschaft besonders hervorgehoben.
description: Jahrbuch für Christliche Sozialwissenschaften, Bd. 63 (2022): Christliche Sozialethik – eine sozialwissenschaftliche und theologische Disziplin
Christliche Sozialethik und der Tellerrand
Creators: name: Becka, Michelle
Publisher: name: Jahrbuch für Christliche Sozialwissenschaften
Year: 2022

description: Der Beitrag vertritt die These, dass die deutschsprachige Sozialethik mehr über den Tellerrand schauen, insbesondere Kontexte und Theorien des globalen Südens zur Kenntnis nehmen sollte. Anhand von drei exemplarischen Feldern werden die Schwierigkeiten dieses Unterfangens aufgezeigt. Im Umgang mit Problemen Globaler Gesundheit wird als Defizit dargelegt, dass lokale Problemlagen und Theorien häufig ignoriert und auf eine single story reduziert werden. Am Beispiel des Buen Vivir wird verdeutlicht, dass es eine Neigung gibt, vorschnell Theorien des Globalen Südens abzuwerten, ohne sich die Mühe des Verstehens zu machen. Und in der Rezeption der Menschenrechtskritik postund dekolonialer Theorien wird die Gefahr gesehen, diese entweder in einer Weise zu übernehmen, dass der normative Anspruch der Menschenrechte aufgegeben oder aber die berechtigte Kritik vollständig abgelehnt wird. Demgegenüber wird vertreten, dass CSE kontext- und alteritätssensibel sein muss. Gleichzeitig ist aber der Anspruch, gut begründete normative Ansprüche zu verteidigen, nicht aufzugeben. Der Beitrag diskutiert, ob oder wie das gelingen kann, und bringt dazu post-/dekoloniale Ansätze mit alterirätsphilosohischen (Anerkennungs-) Ansätzen ins Gespräch. Demgegenüber wird vertreten, dass CSE kontext- und alteritätssensibel sein muss. Gleichzeitig ist aber der Anspruch, gut begründete normative Ansprüche zu verteidigen, nicht aufzugeben. Der Beitrag diskutiert, ob oder wie das gelingen kann, und bringt dazu post-/dekoloniale Ansätze mit alterirätsphilosohischen (Anerkennungs-)Ansätzen ins Gespräch.
description: Jahrbuch für Christliche Sozialwissenschaften, Bd. 63 (2022): Christliche Sozialethik – eine sozialwissenschaftliche und theologische Disziplin
Solidarität als Relationalität und Kritik
Creators: name: Reder, Michael
Publisher: name: Jahrbuch für Christliche Sozialwissenschaften
Year: 2022

description: Solidarität erfährt sowohl im gesellschaftlichen Alltag als auch im (politisch-)philosophischen Diskurs seit einigen Jahren eine immer größere Aufmerksamkeit. Impulse aus Sozialethik und christlicher Sozialverkündigung werden dabei allerdings wenig gehört bzw. rezipiert. Entlang zentraler Begriffe des philosophischen Diskurses, und zwar der sozialen und politischen Solidarität sowie der Relationalität und Kritik, wird aufgezeigt, wie diese Leerstelle geschlossen werden kann. Denn diese Traditionen können Wichtiges zur Klärung dieser Begriffe beitragen. Dabei wird auch diskutiert, welchen Beitrag die von Bernhard Emunds rekonstruierte Theorie des Solidarismus spielen kann.
description: Jahrbuch für Christliche Sozialwissenschaften, Bd. 63 (2022): Christliche Sozialethik – eine sozialwissenschaftliche und theologische Disziplin
High-order harmonic generation from field-distorted orbitals
Creators: name: Śpiewanowski, Maciej Dominik
name: Etches, Adam
name: Madsen, Lars Bojer
Publisher: name: arXiv
Year: 2013
Subjects: subject: Atomic Physics (physics.atom-ph)
subject: Quantum Physics (quant-ph)
subject: FOS: Physical sciences

description: We investigate the effect on high-order harmonic generation of the distortion of molecular orbitals by the driving laser field. Calculations for high-order harmonic generation including orbital distortion are performed for N2. Our results allow us to suggest that field-distortion is the reason why the two-center interference minimum has never been observed experimentally in N2. We propose experimental parameters which should allow an observation of the two-center interference minimum.
Aktuelle Fragen wirtschaftsethischer Diskurse
Creators: name: Nothelle-Wildfeuer, Ursula
Publisher: name: Jahrbuch für Christliche Sozialwissenschaften
Year: 2022

description: Auf der Suche nach solidaristischen Impulsen aus der klassischen Soziallehre für die aktuellen Diskurse wird das konstitutive Aufeinander-Verwiesen-Sein von Subsidiaritäts- und Solidaritätsprinzip als Spezifikum der Tradition betont und deren Tragfähigkeit im Blick auf die Diskurse zum BGE und zur Selbstoptimierung diskutiert.
description: Jahrbuch für Christliche Sozialwissenschaften, Bd. 63 (2022): Christliche Sozialethik – eine sozialwissenschaftliche und theologische Disziplin
Minimal Flavour Violation and Anomalous Top Decays
Creators: name: Faller, Sven
name: Gadatsch, Stefan
name: Mannel, Thomas
Publisher: name: arXiv
Year: 2013
Subjects: subject: High Energy Physics - Phenomenology (hep-ph)
subject: FOS: Physical sciences

description: Top quark physics at the LHC may open a window to physics beyond the standard model and even lead us to an understanding of the phenomenon "flavour". However, current flavour data is a strong hint that no "new physics" with a generic flavour structure can be expected in the TeV scale. In turn, if there is "new physics" at the TeV scale, it must be "minimally flavour violating". This has become a widely accepted assumption for "new physics" models. In this paper we propose a model-independent scheme to test minimal flavour violation for the anomalous charged $Wtq$, $q\in{d,s,b}$, and flavour-changing $Vtq$, $q\in{u,c}$ and $V\in{Z,γ,g}$ couplings within an effective field theory framework, i.e., in a model-independent way. We perform a spurion analysis of our effective field theory approach and calculate the decay rates for the anomalous top-quark decays in terms of the effective couplings for different helicities by using a two-Higgs doublet model of type II, under the assumption that the top-quark is produced at a high-energy collision and decays as a quasi-free particle.
description: 12 pages, 6 figures
Comparison of shell model results for even-even Se isotopes
Creators: name: Srivastava, P. C.
name: Ermamatov, M. J.
Publisher: name: arXiv
Year: 2013
Subjects: subject: Nuclear Theory (nucl-th)
subject: FOS: Physical sciences

description: Comprehensive set of shell model calculations for $^{78-84}$Se isotopes have been performed with recently derived interactions, namely JUN45 and jj44b for ${f_{5/2}pg_{9/2}}$ space. To study the importance of the proton excitations across Z=28 shell in this region mentioned by Cheal {\it et al.} [Phys. Rev. Lett. {\bf104}, 252502 (2010)], calculation for ${fpg_{9/2}}$ valence space using an ${fpg}$ effective interaction with $^{48}$Ca as core and imposing a truncation has also been performed. Comparison of the calculations with experimental data show that the predicted results of jj44b interaction are in good agreement with experimental data.
description: 15 pages, 6 figures, Accepted for publication in Physica Scripta
Embedding the dual complex of hyper-rectangular partitions
Creators: name: Kerber, Michael
Publisher: name: Journal of Computational Geometry
Year: 2013

description: A rectangular partition is the partition of an (axis-aligned) rectangle into interior-disjoint rectangles. We ask whether a rectangular partition permits a nice drawing of its dual, that is, a straight-line embedding of it such that each dual vertex is placed into the rectangle that it represents. We show that deciding whether such a drawing exists is NP-complete. Moreover, we consider the drawing where a vertex is placed in the center of the representing rectangle and consider sufficient conditions for this drawing to be nice. This question is studied both in the plane and for the higher-dimensional generalization of rectangular partitions.
description: Journal of Computational Geometry, Vol. 4 No. 1 (2013)
Von der gesellschaftlichen Ermöglichung der Geldwirtschaft
Creators: name: Emunds, Bernhard
Publisher: name: Jahrbuch für Christliche Sozialwissenschaften
Year: 2022

description: Der Beitrag geht davon aus, dass die Christliche Sozialethik grundlegend eine methodisch kontrolliert betriebene Ethik ist, welche die Beiträge von Christ*innen und ihrer Kirche(n) in öffentlichen Diskursen der Gesellschaft unterstützt und sich ihrerseits an Debatten der anwendungsorientierten Ethik beteiligt. Exemplarisch wird anhand dreier Motive der Katholischen Soziallehre bzw. des katholischen Solidarismus aufgezeigt, dass die Sozialethik gerade auch dann in der Lage ist, zu wirtschaftsethischen Debatten heute verständliche und relevante Beiträge zu liefern, wenn sie sich um eine zeitgenössisch verantwortbare Rezeption einzelner eigener Traditionsbestände bemüht: Ein beinahe holistisches Verständnis von Wirtschaft, die Forderung nach einem gerechten Familienlohn und die Katholische Eigentumsethik können so aufgegriffen und weiterentwickelt werden, dass sie helfen, jene gesellschaftlichen Leistungen zu berücksichtigen, die außerhalb der Sphäre monetär bewerteter ökonomischer Aktivitäten erbracht werden, aber für diese unerlässlich sind. Die drei Motive bieten daher Anknüpfungspunkte dafür, die politische Gestaltung des Verhältnisses der Wirtschaft zur (Welt-)Gesellschaft insgesamt wirtschaftsethisch zu orientieren.
description: Jahrbuch für Christliche Sozialwissenschaften, Bd. 63 (2022): Christliche Sozialethik – eine sozialwissenschaftliche und theologische Disziplin
The number of distinct distances from a vertex of a convex polygon
Creators: name: Nivasch, Gabriel
name: Pach, János
name: Pinchasi, Rom
name: Zerbib, Shira
Publisher: name: Journal of Computational Geometry
Year: 2013

description: Erdős conjectured in 1946 that every $n$-point set $P$ in convex position in the plane contains a point that determines at least $\lfloor n/2\rfloor$ distinct distances to the other points of $P$. The best known lower bound due to Dumitrescu (2006) is $13n/36 − O(1)$. In the present note, we slightly improve on this result to $(13/36 + \varepsilon)n − O(1)$ for $\varepsilon \approx 1/23000$. Our main ingredient is an improved bound on the maximum number of isosceles triangles determined by $P$.
description: Journal of Computational Geometry, Vol. 4 No. 1 (2013)
Inhaltsverzeichnis
Creators: name: Heimbach-Steins, Marianne
Publisher: name: Jahrbuch für Christliche Sozialwissenschaften
Year: 2022

description: Jahrbuch für Christliche Sozialwissenschaften, Bd. 63 (2022): Christliche Sozialethik – eine sozialwissenschaftliche und theologische Disziplin
Universality in the full counting statistics of trapped fermions
Creators: name: Eisler, Viktor
Publisher: name: arXiv
Year: 2013
Subjects: subject: Statistical Mechanics (cond-mat.stat-mech)
subject: FOS: Physical sciences

description: We study the distribution of particle number in extended subsystems of a one-dimensional non-interacting Fermi gas confined in a potential well at zero temperature. Universal features are identified in the scaled bulk and edge regions of the trapped gas where the full counting statistics are given by the corresponding limits of the eigenvalue statistics in Gaussian unitary random matrix ensembles. The universal limiting behavior is confirmed by the bulk and edge scaling of the particle number fluctuations and the entanglement entropy.
description: 5 pages, 4 figures, published version
Vorwort
Creators: name: Heimbach-Steins, Marianne
name: Bachmann, Claudius
Publisher: name: Jahrbuch für Christliche Sozialwissenschaften
Year: 2022

description: Jahrbuch für Christliche Sozialwissenschaften, Bd. 63 (2022): Christliche Sozialethik – eine sozialwissenschaftliche und theologische Disziplin
ZKCM: a C++ library for multiprecision matrix computation with applications in quantum information
Creators: name: SaiToh, Akira
Publisher: name: arXiv
Year: 2013
Subjects: subject: Mathematical Software (cs.MS)
subject: Computational Physics (physics.comp-ph)
subject: Quantum Physics (quant-ph)
subject: FOS: Computer and information sciences
subject: FOS: Physical sciences
subject: G.4
subject: 97N80, 81-01

description: ZKCM is a C++ library developed for the purpose of multiprecision matrix computation, on the basis of the GNU MP and MPFR libraries. It provides an easy-to-use syntax and convenient functions for matrix manipulations including those often used in numerical simulations in quantum physics. Its extension library, ZKCM_QC, is developed for simulating quantum computing using the time-dependent matrix-product-state simulation method. This paper gives an introduction about the libraries with practical sample programs.
description: 19 pages, 5 figures, to appear in Comput. Phys. Comm.; this is an extended version of arXiv:1111.3124, v2: typographical corrections only
Kinetic convex hulls, Delaunay triangulations and connectivity structures in the black-box model
Creators: name: De Berg, Mark
name: Roeloffzen, Marcel
name: Speckmann, Bettina
Publisher: name: Journal of Computational Geometry
Year: 2012

description: Over the past decade, the kinetic-data-structures framework has become thestandard in computational geometry for dealing with moving objects. A fundamental assumption underlying the framework is that the motions of the objects are known in advance. This assumption severely limits the applicability of KDSs. We study KDSs in the black-box model, which is a hybrid of the KDS model and the traditional time-slicing approach. In this more practical model we receive the position of each object at regular time steps and we have an upper bound on dmax, the maximum displacement of any point in one time step. We study the maintenance of the convex hull and the Delaunay triangulation of a planar point set P in the black-box model, under the following assumption on dmax: there is some constant k such that for any point p in P the disk of radius dmax contains at most k points. We analyze our algorithms in terms of Δk, the so-called k-spread of P. We show how to update the convex hull at each time step in O(min(n, kΔklog n)log n) amortized time. For the Delaunay triangulation our main contribution is an analysis of the standard edge-flipping approach; we show that the number of flips is O(k2Δk2) at each time step.
description: Journal of Computational Geometry, Vol. 3 No. 1 (2012)
Off-equilibrium Langevin dynamics of the discrete nonlinear Schroedinger chain
Creators: name: Iubini, S.
name: Lepri, S.
name: Livi, R.
name: Politi, A.
Publisher: name: arXiv
Year: 2013
Subjects: subject: Statistical Mechanics (cond-mat.stat-mech)
subject: FOS: Physical sciences

description: Suitable Langevin thermostats are introduced which are able to control both the temperature and the chemical potential of a one-dimensional lattice of nonlinear Schrödinger oscillators. The resulting non-equilibrium stationary states are then investigated in two limit cases (low temperatures and large particle densities), where the dynamics can be mapped onto that of a coupled-rotor chain with an external torque. As a result, an effective kinetic definition of temperature can be introduced and compared with the general microcanonical (global) definition.
description: Accepted for publication in JSTAT
An optimal algorithm for computing angle-constrained spanners
Creators: name: Carmi, Paz
name: Smid, Michiel
Publisher: name: Journal of Computational Geometry
Year: 2012

description: Let S be a set of n points in Rd and let t>1 be a real number. A graph G=(S,E) is called a t-spanner for S, if for any two points p and q in S, the shortest-path distance in G between p andq is at most t|pq|, where |pq| denotes the Euclidean distance between p and q. The graph G is called θ-angle-constrained, if any two distinct edges sharing an endpoint make an angle of at least θ. It is shown that, for any θ with 0
description: Journal of Computational Geometry, Vol. 3 No. 1 (2012)
An exponential lower bound on the complexity of regularization paths
Creators: name: Gärtner, Bernd
name: Jaggi, Martin
name: Maria, Clément
Publisher: name: Journal of Computational Geometry
Year: 2012

description: For a variety of regularized optimization problems in machine learning, algorithms computing the entire solution path have been developed recently. Most of these methods are quadratic programs that are parameterized by a single parameter, as for example the Support Vector Machine (SVM). Solution path algorithms do not only compute the solution for one particular value of the regularization parameter but the entire path of solutions, making the selection of an optimal parameter much easier. It has been assumed that these piecewise linear solution paths have only linear complexity, i.e. linearly many bends. We prove that for the support vector machine this complexity can be exponential in the number of training points in the worst case. More strongly, we construct a single instance of n input points in d dimensions for an SVM such that at least Θ(2n/2) = Θ(2d)many distinct subsets of support vectors occur as the regularization parameter changes.
description: Journal of Computational Geometry, Vol. 3 No. 1 (2012)
Minimum area polyomino Venn diagrams
Creators: name: Bultena, Bette
name: Klimesh, Matthew
name: Ruskey, Frank
Publisher: name: Journal of Computational Geometry
Year: 2012

description: Polyomino Venn (or polyVenn) diagrams are Venn diagrams whose curves are the perimeters of orthogonal polyominoes drawn on the integer lattice. Minimum area polyVenn diagrams are those in which each of the 2n intersection regions, in a diagram of n polyominoes, consists of exactly one unit square. We construct minimum area polyVenn diagrams in bounding rectangles of size 2r×2c whenever r, c ≥ 2. Our construction is inductive, and depends on two expansionresults. First, a minimum area polyVenn diagram in a 2r×2c rectangle can be expanded to produce another that fits into a 2r+1×2c+1 rectangle. Second, a minimum area polyVenn in a 22×2c rectangle can be expanded to produce another that fits into a 22×2c+3 bounding rectangle. Finally, for even n we construct n-set polyVenn diagrams in bounding rectangles of size (2n/2-1)×(2n/2+1) in which the empty set is not represented as a unit square.
description: Journal of Computational Geometry, Vol. 3 No. 1 (2012)
Observational perspective of accretion in young stars
Creators: name: Mendigutía, I.
Publisher: name: Zenodo
Year: 2022

description: The mass accretion rate is a fundamental parameter to characterise young stars -and many other astrophysical sources-. It quantifies the rate at which material falls onto the central object, constraining the timescale of stellar formation and circumstellar dissipation. In turn, the way we transform from direct observations to mass accretion rates is closely related to the accepted accretion paradigm. In this review talk I will show the evidences supporting that magnetospheric accretion is the actual paradigm that drives the derivation of mass accretion rates for the vast majority of young stars. From a practical perspective, I will summarise the ways to derive accretion rates from observable quantities. In addition, I will discuss about the massive sources for which magnetospheric accretion probably no longer applies, and the need of an alternative scenario to infer their accretion rates from observations. Last but not least, I will outline other open issues and future avenues concerning the empirical determination of mass accretion rates.
title: ANALYSIS OF THE MODERN EPIDEMIOLOGICAL SITUATION AND CLINICAL MANIFESTATIONS OF CRIMEAN HEMORRHAGIC FEVER ON THE TERRITORY OF THE ASTRAKHAN REGION
Creators: name: Mirekina, Elena V.
name: Galimzyanov, Khalil M.
name: Cherenova, Lelya P.
name: Bedlinskaya, Nadiya R.
Publisher: name: Astrakhan State Medical University
Year: 2019

description: The results of epidemiological data and a comprehensive study of the clinical manifestations of the Crimean hemorrhagic fever depending on the severity of the disease in the Astrakhan region for the period 2005-2018 are presented. These data allowed us to analyze the epidemiological situation and identify the features of the current course of the Crimean hemorrhagic fever in the Astrakhan region at the present stage. Key words: ixodic mites, Crimean hemorrhagic fever, petechial rash, hemorrhagic syndrome, abdominal haemorrhage, virus.
Fugacity and Reheating of Primordial Neutrinos
Creators: name: Birrell, Jeremiah
name: Yang, Cheng-Tao
name: Chen, Pisin
name: Rafelski, Johann
Publisher: name: arXiv
Year: 2013
Subjects: subject: Cosmology and Nongalactic Astrophysics (astro-ph.CO)
subject: General Relativity and Quantum Cosmology (gr-qc)
subject: High Energy Physics - Phenomenology (hep-ph)
subject: FOS: Physical sciences

description: We clarify in a quantitative way the impact that distinct chemical $T_c$ and kinetic $T_k$ freeze-out temperatures have on the reduction of the neutrino fugacity $Υ_ν$ below equilibrium, i.e. $Υ_ν<1$, and the increase of the neutrino temperature $T_ν$ via partial reheating. We establish the connection between $Υ_ν$ and $T_k$ via the modified reheating relation $T_ν(Υ_ν)/T_γ$, where $T_γ$ is the temperature of the background radiation. Our results demonstrate that one must introduce the chemical nonequilibrium parameter, i.e., the fugacity, $Υ_ν$, as an additional standard cosmological model parameter in the evaluation of CMB fluctuations as its value allows measurement of $T_k$.
description: 6 pages, 1 figure
Approximating the average stretch factor of geometric graphs
Creators: name: Cheng, Siu-Wing
name: Knauer, Christian
name: Langerman, Stefan
name: Smid, Michiel
Publisher: name: Journal of Computational Geometry
Year: 2012

description: Let G be a geometric graph whose vertex set S is a set of n points in ℝd. The stretch factor of two distinct points p and q in S is the ratio of their shortest-path distance in G and their Euclidean distance. We consider the problem of approximating the average of the n choose 2 stretch factors determined by all pairs of points in S. We show that for paths, cycles, and trees, this average can be approximated, within a factor of 1+ε, in O(n polylog(n)) time. For plane graphs in ℝ2, we present a (2+ε)-approximation algorithm with running time O(n5/3polylog(n)), and a (4+ε)-approximation algorithm with running time O(n3/2polylog(n)). Finally, we show that, for any tree in ℝ2, the exact average of the squares of the n choose 2 stretch factors can be computed in O(n11/6) time.
description: Journal of Computational Geometry, Vol. 3 No. 1 (2012)
Fluid flow dynamics under location uncertainty
Creators: name: Mémin, Etienne
Publisher: name: arXiv
Year: 2013
Subjects: subject: Fluid Dynamics (physics.flu-dyn)
subject: FOS: Physical sciences

description: We present a derivation of a stochastic model of Navier Stokes equations that relies on a decomposition of the velocity fields into a differentiable drift component and a time uncorrelated uncertainty random term. This type of decomposition is reminiscent in spirit to the classical Reynolds decomposition. However, the random velocity fluctuations considered here are not differentiable with respect to time, and they must be handled through stochastic calculus. The dynamics associated with the differentiable drift component is derived from a stochastic version of the Reynolds transport theorem. It includes in its general form an uncertainty dependent "subgrid" bulk formula that cannot be immediately related to the usual Boussinesq eddy viscosity assumption constructed from thermal molecular agitation analogy. This formulation, emerging from uncertainties on the fluid parcels location, explains with another viewpoint some subgrid eddy diffusion models currently used in computational fluid dynamics or in geophysical sciences and paves the way for new large-scales flow modelling. We finally describe an applications of our formalism to the derivation of stochastic versions of the Shallow water equations or to the definition of reduced order dynamical systems.
Cover contact graphs
Creators: name: Atienza, Nieves
name: De Castro, Natalia
name: Cortés, Carmen
name: Garrido, M. Ángeles
name: Grima, Clara I.
name: Hernández, Gregorio
name: Márquez, Alberto
name: Moreno-González, Auxiliadora
name: Nöllenburg, Martin
name: Portillo, José Ramon
name: Reyes, Pedro
name: Valenzuela, Jesús
name: Villar, Maria Trinidad
name: Wolff, Alexander
Publisher: name: Journal of Computational Geometry
Year: 2012

description: We study problems that arise in the context of covering certain geometric objects called seeds (e.g., points or disks) by a set of other geometric objects called cover (e.g., a set of disks or homothetic triangles). We insist that the interiors of the seeds and the cover elements are pairwise disjoint, respectively, but they can touch. We call the contact graph of a cover a cover contact graph (CCG). We are interested in three types of tasks, both in the general case and in the special case of seeds on a line: (a) deciding whether a given seed set has a connected CCG, (b) deciding whether a given graph has a realization as a CCG on a given seed set, and (c) bounding the sizes of certain classes of CCG's. Concerning (a) we give efficient algorithms for the case that seeds are points and show that the problem becomes hard if seeds and covers are disks. Concerning (b) we show that this problem is hard even for point seeds and disk covers (given a fixed correspondence between graph vertices and seeds). Concerning (c) we obtain upper and lower bounds on the number of CCG's for point seeds.
description: Journal of Computational Geometry, Vol. 3 No. 1 (2012)
Colouring the triangles determined by a point set
Creators: name: Fabila-Monroy, Ruy
name: Wood, David R.
Publisher: name: Journal of Computational Geometry
Year: 2012

description: Let P be a set of n points in general position in the plane. We study the chromatic number of the intersection graph of the open triangles determined by P. It is known that this chromatic number is at least n3/27+O(n2) and, if P is in convex position, the answer is n3/24+O(n2). We prove that for arbitrary P, the chromatic number is at most n3/19.259+O(n2).
description: Journal of Computational Geometry, Vol. 3 No. 1 (2012)
Reactive Desorption and Radiative Association as Possible Drivers of Complex Molecule Formation in the Cold Interstellar Medium
Creators: name: Vasyunin, A. I.
name: Herbst, Eric
Publisher: name: arXiv
Year: 2013
Subjects: subject: Astrophysics of Galaxies (astro-ph.GA)
subject: FOS: Physical sciences

description: The recent discovery of terrestrial-type organic species such as methyl formate and dimethyl ether in the cold interstellar gas has proved that the formation of organic matter in the Galaxy begins at a much earlier stage of star formation than was thought before. This discovery represents a challenge for astrochemical modelers. The abundances of these molecules cannot be explained by the previously developed "warm-up" scenario, in which organic molecules are formed via diffusive chemistry on surfaces of interstellar grains starting at 30 K, and then released to the gas at higher temperatures during later stages of star formation. In this article, we investigate an alternative scenario in which complex organic species are formed via a sequence of gas-phase reactions between precursor species formed on grain surfaces and then ejected into the gas via efficient reactive desorption, a process in which non-thermal desorption occurs as a result of conversion of the exothermicity of chemical reactions into the ejection of products from the surface. The proposed scenario leads to reasonable if somewhat mixed results at temperatures as low as 10 K and may be considered as a step towards the explanation of abundances of terrestrial-like organic species observed during the earliest stages of star formation.
description: 23 pages, 5 figures, accepted to ApJ
title: Processing Photomosaic Imagery of Coral Reefs Using Structure-from-Motion Standard Operating Procedures
Creators: name: Suka, Rhonda
name: Asbury, Mollie
name: Gray, Andrew Elisha
name: Winston, Morgan
name: Oliver, Thomas (Thomas Andrew)
name: Couch, Courtney S.
Publisher: name: Pacific Islands Fisheries Science Center (U.S.)
Year: 2019

description: NOAA technical memorandum NMFS-PIFSC ; 93
Luminosity measurement at ILC
Creators: name: Bozovic-Jelisavcic, I.
name: Lukic, S.
name: Dumbelovic, G. Milutinovic
name: Pandurovic, M.
name: Smiljanic, I.
Publisher: name: arXiv
Year: 2013
Subjects: subject: Accelerator Physics (physics.acc-ph)
subject: High Energy Physics - Experiment (hep-ex)
subject: FOS: Physical sciences

description: In this paper we describe a method of luminosity measurement at the future linear collider ILC that estimates and corrects for the impact of the dominant sources of systematic uncertainty originating from the beam-induced effects and the background from physics processes. Based on the relativistic kinematics of the collision frame of the Bhabha process, the beam-beam related uncertainty is reduced to a permille independently of the precision with which the beam parameters are known. With the specific event selection, different from the isolation cuts based on topology of the signal used at LEP, combined with the corrective methods we introduce, the overall systematic uncertainty in the peak region above 80% of the nominal center-of-mass energy meets the physics requirements to be at the few permille level at all ILC energies.
description: Accepted for publication in JINST (submission JINST_016P_0413)