cometadata/datacite-rtg-text-other-reclassification-records huggingface dataset:
Accurate classification of 29 objects detected in the 39 months Palermo Swift/BAT hard X-ray catalogue
Creators: name: Parisi, P.
name: Masetti, N.
name: Jiménez-Bailón, E.
name: Chavushyan, V.
name: Palazzi, E.
name: Landi, R.
name: Malizia, A.
name: Bassani, L.
name: Bazzano, A.
name: Bird, A. J.
name: Charles, P. A.
name: Galaz, G.
name: Mason, E.
name: McBride, V. A.
name: Minniti, D.
name: Morelli, L.
name: Schiavone, F.
name: Ubertini, P.
Publisher: name: arXiv
Year: 2012
Subjects: subject: High Energy Astrophysical Phenomena (astro-ph.HE)
subject: Cosmology and Nongalactic Astrophysics (astro-ph.CO)
subject: FOS: Physical sciences

description: Through an optical campaign performed at 4 telescopes located in the northern and the southern hemispheres, plus archival data from two on-line sky surveys, we have obtained optical spectroscopy for 29 counterparts of unclassified or poorly studied hard X-ray emitting objects detected with Swift/BAT and listed in the 39 months Palermo catalogue. All these objects have also observations taken with Swift/XRT or XMM-EPIC which not only allow us to pinpoint their optical counterpart, but also to study their X-ray spectral properties (column density, power law photon index and F2-10 keV flux). We find that 28 sources in our sample are AGN; 7 are classified as type 1 while 21 are of type 2; the remaining object is a galactic cataclysmic variable. Among our type 1 AGN, we find 5 objects of intermediate Seyfert type (1.2-1.9) and one Narrow Line Seyfert 1 galaxy; for 4 out of 7 sources, we have been able to estimate the central black hole mass. Three of the type 2 AGN of our sample display optical features typical of the LINER class and one is a likely Compton thick AGN. All galaxies classified in this work are relatively nearby objects since their redshifts lie in the range 0.008-0.075; the only galactic object found lies at an estimated distance of 90 pc. We have also investigated the optical versus X-ray emission ratio of the galaxies of our sample to test the AGN unified model. For them, we have also compared the X-ray absorption (due to gas) with the optical reddening (due to dust): we find that for most of our sources, specifically those of type 1.9-2.0 the former is higher than the latter confirming early results by Maiolino et al. (2001); this is possibly due to the properties of dust in the circumnuclear obscuring torus of the AGN.
description: 15 pages, 4 figures, 8 tables, accepted for publication on Astronomy and Astrophysics
Occurrence of the 2:1 commensurability in a gas giant-Super-Earth system
Creators: name: Podlewska-Gaca, E.
name: Szuszkiewicz, E.
Publisher: name: arXiv
Year: 2011
Subjects: subject: Earth and Planetary Astrophysics (astro-ph.EP)
subject: FOS: Physical sciences

description: We investigate how the conditions occurring in a protoplanetary disc may determine the final structure of a planetary system emerging from such a disc. We concentrate our attention on the dynamical interactions between disc and planets leading to orbital migration, which in turn, in favourable circumstances, can drive planets into a mean-motion commensurability. We find that for a system containing a gas giant on the external orbit and a Super-Earth on the internal one, both embedded in a gaseous disc, the 2:1 resonance is a very likely configuration, so one can expect it as an outcome of the early phases of the planetary system formation. Our conclusion is based on an extensive computational survey in which we ask what are the disc properties (the surface density and the viscosity) for which the 2:1 commensurability may be attained. To answer this question we employ a full two-dimensional hydrodynamic treatment of the disc-planet interactions. In general terms, we can claim that the conditions which favour the 2:1 mean-motion resonance exist in the protoplanetary discs with mass accretion rates typical for slowly accreting T Tauri stars. For accretion rates higher than those needed for the 2:1 commensurability we observe a variety of behaviours, among them the passage to the 3:2 resonance, the scattering of the Super-Earth or the divergent migration caused by the outward migration of the gas giant. The results we have obtained from numerical simulations are compared with the predictions coming from the existing analytical expressions of the migration speed and the strength of the mean motion resonances. The conditions that we have found for the attainment of the 2:1 commensurability are discussed in the framework of the properties of protoplanetary discs that are known from the observations.
description: 12 pages, 11 figures, accepted for publication in MNRAS
Realtime GPGPU FFT ocean water simulation
Creators: name: Flügge, Fynn-Jorin
Publisher: name: TUHH Universitätsbibliothek
Year: 2017
Subjects: subject: GPU
subject: Animation
subject: game engineering
subject: OpenGL
subject: realtime graphics
classificationCode: 004
subject: Informatik

description: Die Fast Fourier Transformation (FFT) ist bekannt als einer der einflussreichsten Algorithmen für Digitale Signalverarbeitung des 20. Jahrhunderts. Diese Arbeit stellt einen Lösungsansatz zur Berechnung einer 2D-FFT in Echtzeit auf der GPU vor. Desweiteren wird gezeigt wie mit 2D-FFT's eine Echtzeit Ozean Simulation gerendert wird.
description: The Fast Fourier Transform (FFT) is known as one of the most influential algorithms in the 20th century for digital signal processing. This elaboration presents an approach for computing a 2D-FFT on GPU in realtime. Further it is shown how to animate a realtime ocean simulation with 2D-FFT's.
Prioritizing pharmaceutically active compounds (PhACs) based on occurrence-persistency-mobility-toxicity (OPMT) criteria: an application to the Brazilian scenario
Creators: name: Roveri, V.
name: Guimarães, L. Lopes
name: Correia, A.T.
Publisher: name: Taylor & Francis
Year: 2023
Subjects: subject: Pharmacology
subject: Environmental Sciences not elsewhere classified
subject: Ecology
subject: FOS: Biological sciences
subject: Biological Sciences not elsewhere classified
subject: Science Policy
subject: Infectious Diseases
subject: FOS: Health sciences
subject: Plant Biology

description: A study of Quantitative Structure Activity Relationship (QSAR) was performed to assess the possible adverse effects of 25 pharmaceuticals commonly found in the Brazilian water compartments and to establish a ranking of environmental concern. The occurrence (O), the persistence (P), the mobility (M), and the toxicity (T) of these compounds in the Brazilian drinking water reservoirs were evaluated. Moreover, to verify the predicted OPMT dataset outcomes, a quality index (QI) was also developed and applied. The main results showed that: (i) after in silico predictions through VEGA QSAR, 19 from 25 pharmaceuticals consumed in Brazil were classified as persistent; (ii) moreover, after in silico predictions through OPERA QSAR, 15 among those 19 compounds considered persistent, were also classified as mobile or very mobile. On the other hand, the results of toxicity indicate that only 9 pharmaceuticals were classified with the highest toxicity level. Ultimately, the QI of 7 from 25 pharmaceuticals were categorized as ‘optimal’; 15 pharmaceuticals were categorized as ‘good’; and only 3 pharmaceuticals were categorized as ‘regular’. Therefore, based on the QI criteria used, it is possible to assume that this OPMT prediction dataset had a good reliability. Efforts to reduce emissions of OPMT-pharmaceuticals in Brazilian drinking water reservoirs are encouraged.
Untersuchung des Klimawandeleinflusses auf den Wasserhaushalt der Elbmarsch und die thermischen Grundwasserverhältnisse urbaner Gebiete am Beispiel der Elbinsel Wilhelmsburg
Creators: name: Meier, Anna-Gesa
Publisher: name: TUHH Universitätsbibliothek
Year: 2017
Subjects: subject: Klimawandel
subject: Grundwasser
subject: Wasserhaushalt
subject: Elbmarsch
subject: Untergrundtemperatur
classificationCode: 620
subject: Ingenieurwissenschaften

description: Die Untersuchung zukünftiger Klimawandelauswirkungen auf Grundwasserressourcen ist für die Beurteilung des Grundwasserzustands und der Flächennutzung von Bedeutung. Diese Arbeit untersucht anhand numerischer Modelle hydraulische und thermische Klimawandelfolgen im oberflächennahen Grundwasser der Hamburger Elbinsel Wilhelmsburg. Eine Methode zur Analyse des Effekts klimatisch beeinflusster, städtischer Oberflächentemperaturen auf das Grundwasser wurde entwickelt und angewandt. Rechnungen prognostizieren eine Erhöhung des grundwasserbürtigen Entwässerungsvolumens und der Grundwassertemperatur. Die Untersuchungen legen dar, dass die Änderungen im Grundwasser keine Anpassung des Entwässerungssystems erfordern, und verdeutlichen ein geothermisches Nutzungspotenzial erhöhter Untergrundtemperaturen.
description: Quantification of future climate change impacts on groundwater resources is important to assess the groundwater status and land use. For the Hamburg Elbe island Wilhelmsburg, hydraulic and thermal impacts of climate change on the near-surface groundwater are analysed on the basis of numerical models. A method to examine effects of climatically influenced urban surface temperatures on groundwater has been developed and applied. Model results predict an increase in the groundwater fed drainage volume and in groundwater temperatures. The investigations show, that changes in groundwater potential do not require to adapt the drainage system, and illustrate a geothermal utilization potential of increased surface temperatures.
A shortened recurrence relation for the Bernoulli numbers
Creators: name: Lima, F. M. S.
Publisher: name: arXiv
Year: 2011
Subjects: subject: Number Theory (math.NT)
subject: FOS: Mathematics
subject: 11B68

description: In this note, starting with a little-known result of Kuo, I derive a recurrence relation for the Bernoulli numbers $B_{2 n}$, $n$ being any positive integer. This new recurrence seems advantageous in comparison to other known formulae since it allows the computation of both $B_{4 n}$ and $B_{4 n +2}$ from only $B_0, B_2,..., B_{2n}$.
description: 7 pages, no figures. Submitted to "J. Number Theory" (09/22/2011)
Characterization of two new classes of periplasmic ferric binding proteins
Creators: name: Tom-Yew, Stacey Anne Lisa
Publisher: name: University of British Columbia
Year: 2009

description: Pathogenic bacteria acquire essential iron using specialized iron acquisition systems, such as the FbpABC transport system. The periplasmic FbpA protein delivers iron to the ABC transporter. FbpA proteins have two domains with the iron binding site located at the domain interface. A flexible inter-domain hinge region facilitates substrate dependent conformations. In general, the closed conformations are observed for holo FbpA proteins whereas the apo proteins exhibit increased hinge motion relative to the closed conformation. Closed conformations are likely important for initiating iron translocation across the inner membrane permease. Important bacterial pathogens such as Campylobacter jejuni and Bordetella pertussis contain previously uncharacterized FbpA proteins. Using phylogenetic analyses, six FbpA classes were defined which vary in conservation of iron site ligands and utilization of a synergistic anion. Class I includes the anion-dependent neisserial FbpA (nFbpA). This thesis characterizes the Class III FbpA from Campylobacterjejuni (cFbpA) and the Class II FbpA from Bordetella pertussis (bFbpA). Visible spectroscopy showed high affinity iron binding of cFbpA. X-ray crystallography showed anion-independent iron coordination by cFbpA using a histidine and four tyrosine residues. Confonnational analyses in solution by small angle x-ray scattering (SAXS) showed that cFbpA undergoes limited hinge motion in solution upon substrate binding. Furthermore, an iron uptake role is supported as a cJbpA deletion strain, constructed from C. jejuni 81-176, exhibited impaired growth under iron-limited conditions. Characterization of bFbpA by visible spectroscopy showed high affinity iron binding with carbonate, citrate and oxalate. Distinct holo conformations compared with the apo conformation were observed for bFbpA depending on the synergistic anion. The closed conformation holo bFbpA crystal structure shows iron coordination by carbonate and three tyrosine residues. SAXS analyses also showed that oxalate and citrate treated holo bFbpA exhibit distinct conformations from apo bFbpA in solution. Furthermore, bFbpA undergoes large hinge motion in solution similar to nFbpA. Models for iron transport are proposed in which these bob complexes of bFbpA and cFbpA are candidates for initiating productive interactions with the permease.
A study of the effects of left ventricular contractility and coronary tone on coronary flow dynamics using wave intensity analysis
Creators: name: Sun, Yi-Hui
Publisher: name: Graduate Studies
Year: 2001
Subjects: subject: QP108 .S86 2001
subject: Coronary circulation - Measurement
subject: Heart - Left ventricle
subject: Contractility (Biology)
subject: Cardiovascular system

description: Bilbiography: p. 132-148.
Experimentally ruling out joint reality based on operational completeness
Creators: name: Zhang, Qiuxin
name: Xiang, Yu
name: Gao, Xiaoting
name: Zhu, Chenhao
name: Wang, Yuxin
name: Ding, Liangyu
name: Zhang, Xiang
name: Zhang, Shuaning
name: Cheng, Shuming
name: Hall, Michael J. W.
name: He, Qiongyi
name: Zhang, Wei
Publisher: name: arXiv
Year: 2022
Subjects: subject: Quantum Physics (quant-ph)
subject: FOS: Physical sciences

description: Whether the observables of a physical system admit real values is of fundamental importance to a deep understanding of nature. In this work, we report a device-independent experiment to confirm that the joint reality of two observables on a single two-level system is incompatible with the assumption of operational completeness, which is strictly weaker than that of preparation noncontextuality. We implement two observables on a trapped $^{171}{\rm Yb}^{+}$ ion to test this incompatibility via violation of certain inequalities derived from both linear and nonlinear criteria. Moreover, by introducing a highly controllable dephasing channel, we show that the nonlinear criterion is more robust against noise. Our results push the fundamental limit to delineate the quantum-classical boundary and pave the way for exploring relevant problems in other scenarios.
description: 6 pages, 3 figures
Superconducting Quantum Point Contacts
Creators: name: Bretheau, L.
name: Girit, Ç.
name: Tosi, L.
name: Goffman, M.
name: Joyez, P.
name: Pothier, H.
name: Esteve, D.
name: Urbina, C.
Publisher: name: arXiv
Year: 2012
Subjects: subject: Mesoscale and Nanoscale Physics (cond-mat.mes-hall)
subject: Superconductivity (cond-mat.supr-con)
subject: FOS: Physical sciences

description: We review our experiments on the electronic transport properties of atomic contacts between metallic electrodes, in particular superconducting ones. Despite ignorance of the exact atomic configuration, these ultimate quantum point contacts can be manipulated and well characterized in-situ. They allow performing fundamental tests of the scattering theory of quantum transport. In particular, we discuss the case of the Josephson effect.
title: In-cell analysis of FK506 binding protein 51-glucocorticoid receptor-heat shock protein 90 interaction at single residue resolution
Creators: name: Baischew, Asat
Publisher: name: UNSPECIFIED
Year: 2023

description: The large immunophilins FKBP51 and FKBP52 play key roles in the Hsp90-mediated maturation of steroid hormone receptors, which is crucial for stress-related disorders and correct sexual embryonic development, respectively. A prominent regulatory target is the glucocorticoid receptor (GR), whose activation is repressed by FKBP51 and facilitated by FKBP52. Despite their vital roles, the molecular modes of action of FKBP51 and FKBP52 are poorly understood since the transient key states of FKBP-mediated GR-regulation have remained experimentally elusive. This work presents a systematic incorporation of a photoreactive amino acid inside human cells that allows capture of the transient FKBP51-GR-Hsp90 interactions. A photoreactive, unnatural amino acid is site specifically incorporated by amber suppression and acts as a proximity sensor to map the interaction at single residue resolution. This is first established for FKBP51, where the FKBP51-Hsp90 interaction interface is explored well beyond the known FKBP51-TPR-domain mediated interaction including both the FK1- and FK2-domain of FKBP51. Additionally, the Hsp90 cochaperone p23 is identified as a direct interaction partner of FKBP51 suggesting that a multi-protein complex is needed for a functional Hsp90 machinery. Creating a suitable, high-throughput analysis for mapping protein interaction via ELISA allows the elucidation of the GR-FKBP51 interaction interface in great detail. The identified crosslinking sites all depend on a functional Hsp90 chaperone cycle, are disrupted by GR activation, and cluster in characteristic patterns, defining the relative orientation and contact surfaces within the FKBP51/p23-apoGR complexes. Moreover, the developed ELISA enables quantification of in-cell activation of the GR by its synthetic agonist dexamethasone. GR-->FKBP52 crosslinks were found to be 5-fold more sensitive to GR activation compared to GR-->FKBP51 crosslinks. The ELISA data show that GR activation is facilitated in the context of a FKBP52-Hsp90-GR complex compared to GR in a FKBP51-Hsp90-GR complex. This in accordance with the well-documented GR-facilitating effect of FKBP52 and the GR-repressing effect of FKBP51. Taken together, this work presents the architecture and functional annotation of FKBP51-, and p23-containing Hsp90-apoGR pre-activation complexes, trapped by large scale in-cell photocrosslinking.
Possible chiral spin liquid state in the $S=1/2$ kagome Heisenberg model
Creators: name: Sun, Rong-Yang
name: Jin, Hui-Ke
name: Tu, Hong-Hao
name: Zhou, Yi
Publisher: name: arXiv
Year: 2022
Subjects: subject: Strongly Correlated Electrons (cond-mat.str-el)
subject: FOS: Physical sciences

description: The nature of the ground state for the $S = 1/2$ kagome Heisenberg antiferromagnet (KHAF) has been elusive. We revisit this challenging problem and provide numerical evidence that its ground state might be a chiral spin liquid. Combining the density matrix renormalization group method and analytical analyses, we demonstrate that the previously observed chiral spin liquid phase in the KHAF with longer-range couplings is stable in a broader region. We characterize the nature of the ground state by computing energy derivatives, revealing ground-state degeneracy arising from spontaneous breaking of time-reversal symmetry, and targeting the semion sector. We further investigate the phase diagram in the vicinity of the KHAF and observe a $\sqrt{3}\times\sqrt{3}$ magnetically ordered phase and two valence-bond crystal phases.
Solving the TTC 2011 Compiler Optimization Task with metatools
Creators: name: Lepper, Markus
name: Widemann, Baltasar Trancón y
Publisher: name: arXiv
Year: 2011
Subjects: subject: Software Engineering (cs.SE)
subject: Programming Languages (cs.PL)
subject: FOS: Computer and information sciences
subject: D.1.1;D.1.2;D.2.7;E.1;F.4.2;I.2.2

description: The authors' "metatools" are a collection of tools for generic programming. This includes generating Java sources from mathematically well-founded specifications, as well as the creation of strictly typed document object models for XML encoded texts. In this context, almost every computer-internal structure is treated as a "model", and every computation is a kind of model transformation. This concept differs significantly from "classical model transformation" executed by specialized tools and languages. Therefore it seemed promising to the organizers of the TTC 2011, as well as to the authors, to apply metatools to one of the challenges, namely to the "compiler optimization task". This is a report on the resulting experiences.
description: In Proceedings TTC 2011, arXiv:1111.4407
Nonlinear mechanics with photonic crystal nanomembranes
Creators: name: Antoni, T.
name: Makles, K.
name: Braive, R.
name: Briant, T.
name: Cohadon, P. -F.
name: Sagnes, I.
name: Robert-Philip, I.
name: Heidmann, A.
Publisher: name: arXiv
Year: 2012
Subjects: subject: Quantum Physics (quant-ph)
subject: Mesoscale and Nanoscale Physics (cond-mat.mes-hall)
subject: FOS: Physical sciences

description: Optomechanical systems close to their quantum ground state and nonlinear nanoelectromechanical systems are two hot topics of current physics research. As high-reflectivity and low mass are crucial features to improve optomechanical coupling towards the ground state, we have designed, fabricated and characterized photonic crystal nanomembranes, at the crossroad of both topics. Here we demonstrate a number of nonlinear effects with these membranes. We first characterize the nonlinear behavior of a single mechanical mode and we demonstrate its nonlocal character by monitoring the subsequent actuation-related frequency shift of a different mode. We then proceed to study the underlying nonlinear dynamics, both by monitoring the phase-space trajectory of the free resonator and by characterizing the mechanical response in presence of a strong pump excitation. We observe in particular the frequency evolution during a ring-down oscillation decay, and the emergence of a phase conjugate mechanical response to a weaker probe actuation. Our results are crucial to understand the full nonlinear features of the PhC membranes, and possibly to look for nonlinear signatures of the quantum dynamics.
Valuing learner ideas on stream ecology: exemplar vignettes of thoughts and feelings during a unit of study
Creators: name: Syslak, Anne-Marie
Publisher: name: Education
Year: 2001
Subjects: subject: AC1 .T484 2001 S97
subject: Science students - Alberta - Attitudes
subject: Stream ecology - Study and Teaching (Secondary)
subject: Science students - Attitudes

description: Bibliography: p. 122-126.
Non-reciprocity across scales in active mixtures
Creators: name: Dinelli, Alberto
name: O'Byrne, Jérémy
name: Curatolo, Agnese
name: Zhao, Yongfeng
name: Sollich, Peter
name: Tailleur, Julien
Publisher: name: arXiv
Year: 2022
Subjects: subject: Statistical Mechanics (cond-mat.stat-mech)
subject: Soft Condensed Matter (cond-mat.soft)
subject: FOS: Physical sciences

description: In active matter, the lack of momentum conservation makes non-reciprocal interactions the rule rather than the exception. They lead to a rich set of emerging behaviors that are hard to account for and to predict starting from the microscopic scale, due to the absence of a generic theoretical framework out of equilibrium. Here we consider bacterial mixtures that interact via mediated, non-reciprocal interactions like quorum-sensing and chemotaxis. By explicity relating microscopic and macroscopic dynamics, we show that non-reciprocity may fade as coarse-graining proceeds, leading to large-scale bona fide equilibrium descriptions. In turns, this allows us to account quantitatively, and without fitting parameters, for the rich behaviors observed in microscopic simulations including phase separation, demixing or multi-phase coexistence. We also derive the condition under which non-reciprocity is strong enough to survive coarse-graining, leading to a wealth of dynamical patterns. Again, the explicit coarse-graining of the dynamics allows us to predict the phase diagram of the system starting from its microscopic description. All in all, our work demonstrates that the fate of non-reciprocity across scales is a subtle and important question.
description: 6 pages, 3 figures
Disc instability in RS Ophiuchi: a path to Type Ia supernovae?
Creators: name: Alexander, R. D.
name: Wynn, G. A.
name: King, A. R.
name: Pringle, J. E.
Publisher: name: arXiv
Year: 2011
Subjects: subject: High Energy Astrophysical Phenomena (astro-ph.HE)
subject: FOS: Physical sciences

description: We study the stability of disc accretion in the recurrent nova RS Ophiuchi. We construct a one-dimensional time-dependent model of the binary-disc system, which includes viscous heating and radiative cooling and a self-consistent treatment of the binary potential. We find that the extended accretion disc in this system is always unstable to the thermal-viscous instability, and undergoes repeated disc outbursts on ~10-20yr time-scales. This is similar to the recurrence time-scale of observed outbursts in the RS Oph system, but we show that the disc's accretion luminosity during outburst is insufficient to explain the observed outbursts. We explore a range of models, and find that in most cases the accretion rate during outbursts reaches or exceeds the critical accretion rate for stable nuclear burning on the white dwarf surface. Consequently we suggest that a surface nuclear burning triggered by disc instability may be responsible for the observed outbursts. This allows the white dwarf mass to grow over time, and we suggest that disc instability in RS Oph and similar systems may represent a path to Type Ia supernovae.
description: 8 pages, 5 figures. Accepted for publication in MNRAS
Science for the Kunming-Montreal Global Biodiversity Framework in the Atlantic Ocean region: An iAtlantic perspective
Creators: name: Boteler, Ben
name: Johnson, David
name: Gunn, Vikki
Publisher: name: Zenodo
Year: 2023

description: Science for the Kunming-Montreal Global Biodiversity Framework in the Atlantic Ocean region: An iAtlantic perspective
Key messages:
• Ocean science and knowledge plays an essential role informing the numerous and complex mechanisms established to govern and manage the Atlantic Ocean.
• Conservation and sustainable use efforts for the Atlantic Ocean region, and beyond, must consider highly interconnected and complex ecosystems, facing multiple and cumulative threats.
• With four overarching goals and 23 specific targets, the Kunming-Montreal Global Biodiversity Framework (GBF) acts as a global catalyst for collaborative ocean action to tackle the triple planetary crisis of climate change, pollution, and biodiversity loss.
• The iAtlantic project is a generator of science, data, and knowledge, as well as a critical provider of capacity development. Its results are directly relevant for marine elements of the GBF targets, especially those focused on ecosystem restoration, protected areas, climate change impacts and fisheries.
• Opportunities exist to enhance ocean science for the Atlantic Ocean region and support progress towards the GBF targets and overarching goals.
• This policy brief provides a snapshot of the GBF, the role of marine science in its implementation, and examples of new knowledge that iAtlantic can offer to support achievement of its targets.
Diffusive transport of light in two-dimensional granular materials
Creators: name: Sadjadi, Zeinab
name: Miri, MirFaez
Publisher: name: arXiv
Year: 2012
Subjects: subject: Optics (physics.optics)
subject: Soft Condensed Matter (cond-mat.soft)
subject: FOS: Physical sciences

description: We study photon diffusion in a two-dimensional random packing of monodisperse disks as a simple model of granular material. We apply ray optics approximation to set up a persistent random walk for the photons. We employ Fresnel's intensity reflectance with its rich dependence on the incidence angle and polarization state of the light. We present an analytic expression for the transport-mean-free path in terms of the refractive indices of grains and host medium, grain radius, and packing fraction. We perform numerical simulations to examine our analytical result.
description: 9 pages, 3 figures
Open Covers and Lex Points of Hilbert schemes over quotient rings via relative marked bases
Creators: name: Bertone, Cristina
name: Cioffi, Francesca
name: Orth, Matthias
name: Seiler, Werner M.
Publisher: name: arXiv
Year: 2022
Subjects: subject: Commutative Algebra (math.AC)
subject: Algebraic Geometry (math.AG)
subject: FOS: Mathematics
subject: 13P10, 14C05, 14M05, 13H10, 13F55

description: We introduce the notion of a relative marked basis over quasi-stable ideals, together with constructive methods and a functorial interpretation, developing computational methods for the study of Hilbert schemes over quotients of polynomial rings. Then we focus on two applications.
 The first has a theoretical flavour and produces an explicit open cover of the Hilbert scheme when the quotient ring is Cohen-Macaulay on quasi-stable ideals. Together with relative marked bases, we use suitable general changes of variables which preserve the structure of the quasi-stable ideal, against the expectations.
 The second application has a computational flavour. When the quotient rings are Macaulay-Lex on quasi-stable ideals, we investigate the lex-point of the Hilbert schemes and find examples of both smooth and singular lex-points.
description: 27 pages, comments are welcome
title: Vergleichende Untersuchungen zum Zug- und Druckkriechverhalten der verstärkten und unverstärkten Magnesiumlegierung AE42
title: Comparative investigations on tensile and compressive creep behavior of reinforced and monolithic magnesium alloy AE42
titleType: AlternativeTitle
Creators: name: Dieringa, Hajo
Publisher: name: TUHH Universitätsbibliothek
Year: 2006
Subjects: subject: Magnesium alloy, creep behavior
subject: Magnesiumlegierung
subject: Kriechen
classificationCode: 62.20.Hg
subject: Creep

description: Die minimalen Kriechraten aus Zug- und Druckkriechversuchen, die an der kriechbeständigen Magnesiumdruckgusslegierung AE42 sowie an dem mit 20 Vol.-% Saffilfasern verstärkten AE42-basierten Verbundwerkstoff durchgeführt wurden, zeigten bei beiden Werkstoffen eine Anisotropie bezüglich ihrer Spannungsabhängigkeit. Während des Kriechens auftretende Verformungsmechanismen wurden mit Hilfe der ermittelten Spannungsexponenten und Aktivierungsenergien ermittelt. Ein mathematischer Formalismus wurde entwickelt, der es erlaubt, die minimalen Kriechraten von Druckkriechversuchen aus denen von Zugkriechversuchen abzuschätzen.
description: Minimum creep rates obtained from tensile and compressive creep test performed with the creep resistant magnesium die cast alloy AE42 and the AE42-based composite reinforced with 20 vol.-% Saffil fibers show an anisotropy in their stress dependence. Calculation of stress exponents and activation energies from dependence on applied stress and temperature gave indication of deformation mechanisms which occur during creep. A mathematic formalism connecting the creep rates between tensile and compressive creep on the one hand and between the two materials in the same mode on the other hand was developed.
Probabilistic pointer analysis for multithreaded programs
Creators: name: El-Zawawy, Mohamed A.
Publisher: name: arXiv
Year: 2011
Subjects: subject: Programming Languages (cs.PL)
subject: Logic in Computer Science (cs.LO)
subject: FOS: Computer and information sciences

description: The use of pointers and data-structures based on pointers results in circular memory references that are interpreted by a vital compiler analysis, namely pointer analysis. For a pair of memory references at a program point, a typical pointer analysis specifies if the points-to relation between them may exist, definitely does not exist, or definitely exists. The "may be" case, which describes the points-to relation for most of the pairs, cannot be dealt with by most compiler optimizations. This is so to guarantee the soundness of these optimizations. However, the "may be" case can be capitalized by the modern class of speculative optimizations if the probability that two memory references alias can be measured. Focusing on multithreading, a prevailing technique of programming, this paper presents a new flow-sensitive technique for probabilistic pointer analysis of multithreaded programs. The proposed technique has the form of a type system and calculates the probability of every points-to relation at each program point. The key to our approach is to calculate the points-to information via a post-type derivation. The use of type systems has the advantage of associating each analysis results with a justification (proof) for the correctness of the results. This justification has the form of a type derivation and is very much required in applications like certified code.
description: 12 pages
Contemplating the fate of modified gravity
Creators: name: Golovnev, Alexey
name: Guzman, Maria-Jose
Publisher: name: arXiv
Year: 2022
Subjects: subject: General Relativity and Quantum Cosmology (gr-qc)
subject: High Energy Physics - Theory (hep-th)
subject: FOS: Physical sciences

description: Possible models of modified gravity are being extensively studied now, with most phenomenological motivations coming from puzzles and tensions in cosmology due to a natural desire to better fit the known and newly coming data. At the same time, available experimental evidence is limited for testing gravity as a force beyond the regimes in which the theory of general relativity has proven to be successful. This situation leads researchers to look for ``the simplest modification'' to general relativity in a certain class of models, which is enough to solve one or more problems. As a result, we are lost amid a variety of theories with no deeper guiding principle. We give a general review of existing approaches and discuss the current state of the art.
description: 13 pages, 1 figure. v2: matches the published version
Influence of the magnetoelectric coupling on the electric field induced magnetization reversal in a composite non-strained multiferroic chain
Creators: name: Horley, Paul P.
name: Sukhov, Alexander
name: Jia, Chenglong
name: Martınez, Eduardo
name: Berakdar, Jamal
Publisher: name: arXiv
Year: 2012
Subjects: subject: Materials Science (cond-mat.mtrl-sci)
subject: FOS: Physical sciences

description: We study theoretically the multiferroic dynamics in a composite one-dimensional system consisting of BaTiO3 multiferroically coupled to an iron chain. The method treats the magnetization and the polarization as thermodynamic quantities describable via a combination of the Landau-Lifshits- Gilbert and the Ginzburg-Landau dynamics coupled via an additional term in the total free energy density. This term stems from the multiferroic interaction at the interface. For a wide range of strengths of this coupling we predict the possibility of obtaining a well-developed hysteresis in the ferromagnetic part of the system induced by an external electric field. The dependence of the reversal modes on the electric field frequency is also investigated and we predict a considerable stability of the magnetization reversal for frequencies in the range of 0.5 - 12 [GHz].
description: 7 pages, 4 figures (accepted by Phys. Rev. B)
Solving the TTC 2011 Compiler Optimization Case with GReTL
Creators: name: Horn, Tassilo
Publisher: name: arXiv
Year: 2011
Subjects: subject: Software Engineering (cs.SE)
subject: Programming Languages (cs.PL)
subject: FOS: Computer and information sciences

description: This paper discusses the GReTL solution of the TTC 2011 Compiler Optimization case. The submitted solution covers both the constant folding task and the instruction selection task. The verifier for checking the validity of the graph is also implemented, and some additional test graphs are provided as requested by the extension.
description: In Proceedings TTC 2011, arXiv:1111.4407
Cardiovascular disease risk and central and peripheral responses to exercise in individuals with spinal cord injury
Creators: name: Zbogar, Dominik
Publisher: name: University of British Columbia
Year: 2009

description: Introduction: Persons with spinal cord injury (SCI) are often physically inactive and as such are at increased risk of cardiovascular morbidity. Fortunately, exercise training in SCI can provide improve health-related physical fitness and alleviate medical complications associated with deconditioning. To optimize health-related fitness gains of exercise in SCI and maximize the potential for chronic disease prevention it is necessary to understand the acute responses (central and peripheral) to exercise. Purposes: The primary purposes of this research were to: 1) determine the contribution of central/peripheral limitations to exercise capacity and 2) examine vascular health in SCI. Methods: Seven persons with paraplegia and seven able-bodied (AB) individuals participated in two testing days. Testing day one consisted of incremental arm crank ergometry to exhaustion with measures of cardiac output, muscle oxygenation, and expired gas and ventilatory parameters. Testing day two involved the measurement of arterial compliance and endothelial function. Results: There was a significant difference for small artery compliance between SCI and AB(6.9±3.7 versus 10.5±1.7ml mmHg⁻¹x100, p< 0.05). Arm total haemoglobin increased significantly throughout exercise. Arm oxygenation decreased until 60% of maximal wattage after which values did not change. Though non-significant, the large effect size (eta²=.142) suggests a trend for higher aerobic power in AB (28.6±5.7mL.kg⁻¹min-1)than in SCI (23.7±2.77mL.kg⁻¹min⁻¹)due to a trend for higher cardiac output values in AB (18.0±5.7L.min⁻¹)than SCI (15.8±3.4L.min⁻¹)at maximal exercise. Conclusions: Small artery compliance is lower in SCI than AB. Leveling off of deoxygenated haemoglobin with total haemoglobin increasing throughout exercise suggests a peripheral limitation to arm ergometry in both groups. A trend for higher cardiac output in AB suggests a central limitation in SCI.
Observation of the Cosmic Ray Moon shadowing effect with ARGO-YBJ
Creators: name: YBJ Collaboration
Publisher: name: arXiv
Year: 2011
Subjects: subject: High Energy Astrophysical Phenomena (astro-ph.HE)
subject: High Energy Physics - Experiment (hep-ex)
subject: FOS: Physical sciences

description: Cosmic rays are hampered by the Moon and a deficit in its direction is expected (the so-called \emph{Moon shadow}). The Moon shadow is an important tool to determine the performance of an air shower array. Indeed, the westward displacement of the shadow center, due to the bending effect of the geomagnetic field on the propagation of cosmic rays, allows the setting of the absolute rigidity scale of the primary particles inducing the showers recorded by the detector. In addition, the shape of the shadow permits to determine the detector point spread function, while the position of the deficit at high energies allows the evaluation of its absolute pointing accuracy. In this paper we present the observation of the cosmic ray Moon shadowing effect carried out by the ARGO-YBJ experiment in the multi-TeV energy region with high statistical significance (55 standard deviations). By means of an accurate Monte Carlo simulation of the cosmic rays propagation in the Earth-Moon system, we have studied separately the effect of the geomagnetic field and of the detector point spread function on the observed shadow. The angular resolution as a function of the particle multiplicity and the pointing accuracy have been obtained. The primary energy of detected showers has been estimated by measuring the westward displacement as a function of the particle multiplicity, thus calibrating the relation between shower size and cosmic ray energy. The stability of the detector on a monthly basis has been checked by monitoring the position and the deficit of the Moon shadow. Finally, we have studied with high statistical accuracy the shadowing effect in the "day"/"night" time looking for possible effect induced by the solar wind.
description: 15 pages, 18 figures, Contact author: Giuseppe Di Sciascio (disciascio@roma2.infn.it)
A scalable algorithm to explore the Gibbs energy landscape of genome-scale metabolic networks
Creators: name: De Martino, Daniele
name: Figliuzzi, Matteo
name: De Martino, Andrea
name: Marinari, Enzo
Publisher: name: arXiv
Year: 2012
Subjects: subject: Molecular Networks (q-bio.MN)
subject: Disordered Systems and Neural Networks (cond-mat.dis-nn)
subject: Biological Physics (physics.bio-ph)
subject: FOS: Biological sciences
subject: FOS: Physical sciences

description: The integration of various types of genomic data into predictive models of biological networks is one of the main challenges currently faced by computational biology. Constraint-based models in particular play a key role in the attempt to obtain a quantitative understanding of cellular metabolism at genome scale. In essence, their goal is to frame the metabolic capabilities of an organism based on minimal assumptions that describe the steady states of the underlying reaction network via suitable stoichiometric constraints, specifically mass balance and energy balance (i.e. thermodynamic feasibility). The implementation of these requirements to generate viable configurations of reaction fluxes and/or to test given flux profiles for thermodynamic feasibility can however prove to be computationally intensive. We propose here a fast and scalable stoichiometry-based method to explore the Gibbs energy landscape of a biochemical network at steady state. The method is applied to the problem of reconstructing the Gibbs energy landscape underlying metabolic activity in the human red blood cell, and to that of identifying and removing thermodynamically infeasible reaction cycles in the Escherichia coli metabolic network (iAF1260). In the former case, we produce consistent predictions for chemical potentials (or log-concentrations) of intracellular metabolites; in the latter, we identify a restricted set of loops (23 in total) in the periplasmic and cytoplasmic core as the origin of thermodynamic infeasibility in a large sample ($10^6$) of flux configurations generated randomly and compatibly with the prior information available on reaction reversibility.
description: 11 pages, 6 figures, 1 table; for associated supporting material see http://www.ploscompbiol.org/article/info:doi/10.1371/journal.pcbi.1002562
Direct observation of metastable hot trions in an individual quantum dot
Creators: name: Jovanov, Vase
name: Kapfinger, Stephan
name: Abstreiter, Gerhard
name: Finley, Jonathan J.
Publisher: name: arXiv
Year: 2011
Subjects: subject: Mesoscale and Nanoscale Physics (cond-mat.mes-hall)
subject: FOS: Physical sciences

description: Magneto photoluminescence and excitation spectroscopy are used to probe the excited state spectrum of negatively charged trions in a InGaAs quantum dot. A single dot optical charging device allows us to selectively prepare specific few (1e, 2e) electron states and stabilize hot trions against decay via electron tunnelling from excited orbital states. The spin structure of the excited state results in the formation of metastable trions with strong optical activity that are directly observed in luminescence. Excitation spectroscopy is employed to map the excited singlet and triplet states of the two electron wavefunction and fine structure splittings are measured for the lowest lying and excited orbital states. Magneto-optical measurements allow us to compare the g-factors and diamagnetic response of different trion states.
D1.2 Data Management Plan
Creators: name: Stein, Felix
name: Aydin, Mirac
Publisher: name: Zenodo
Year: 2023
Subjects: DECICE
Data Management Plan

description: The purpose of deliverable D1.2: Data Management Plan is to describe the data management life
 cycle for the data to be collected, processed and/or generated by the DECICE project. As part
 of making research data fi ndable, accessible, interoperable and reusable (FAIR), the project’s Data
 Management Plan (DMP) includes information on the handling of research data during and after
 the end of the project; what data will be accessed, collected, processed and/or generated; which
 methodology and standards will be applied; whether data will be shared and made open access; how
 data will be curated and preserved (including beyond the end of the project).
AI-based automated active learning for discovery of hidden dynamic processes: A use case in light microscopy
Creators: name: Friederich, Nils
name: Yamachui Sitcheu, Angelo Jovin
name: Neumann, Oliver
name: Eroglu-Kayıkçı, Süheyla
name: Prizak, Roshan
name: Hilbert, Lennart
name: Mikut, Ralf
Publisher: name: KIT Scientific Publishing
Year: 2023
Subjects: MLOps
Active Learning
Dynamic Processes
Microscope control

description: In the biomedical environment, experiments assessing dynamic processes are primarily performed by a human acquisition supervisor. Contemporary implementations of such experiments frequently aim to acquire a maximum number of relevant events from sometimes several hundred parallel, non-synchronous processes. Since in some high-throughput experiments, only one or a few instances of a given process can be observed simultaneously, a strategy for planning and executing an efficient acquisition paradigm is essential. To address this problem, we present two new methods in this paper. The first method, Encoded Dynamic Process (EDP), is Artificial Intelligence (AI)-based and represents dynamic processes so as to allow prediction of pseudo-time values from single still images. Second, with Experiment Automation Pipeline for Dynamic Processes (EAPDP), we present a Machine Learning Operations (MLOps)-based pipeline that uses the extracted knowledge from EDP to efficiently schedule acquisition in biomedical experiments for dynamic processes in practice. In a first experiment, we show that the pre-trained State-Of-The- Art (SOTA) object segmentation method Contour Proposal Networks (CPN) works reliably as a module of EAPDP to extract the relevant object for EDP from the acquired three-dimensional image stack.
Bestimmung der im Seegang zusätzlich erforderlichen Antriebsleistung von Schiffen
Creators: name: Zhou, Yaozong
Publisher: name: TUHH Universitätsbibliothek
Year: 1989
Subjects: subject: Antriebsleistung
subject: Containerschiff
classificationCode: 52.00
subject: Maschinenbau, Energietechnik, Fertigungstechnik: Allgemeines

description: Bestimmung der im Seegang zusätzlich erforderlichen Antriebsleistung von Schiffen Die Ergebnisse dieser Arbeit zeigen am Beispiel eines Containerschiffs, daß eine recht genaue Bestimmung des Zusatzwiderstandes und des Mehrleistungsbedarfs eines Schiffes in regelmäßigen Wellen und im unregelmäßigen Seegang mit dem Programmsystem ZWBF6G durchgeführt werden kann. Es zeigte sich, daß bei mittleren Seegangszuständen und mäßigen Geschwindigkeiten die Widerstandserhöhung bereits in der Größenordnung des Glattwasserwiderstandes liegt. Unter Zugrundlegung eines Seegebietes mit bekannter Langzeitverteilung von Seegangs- und Winddaten sowie Kursverteilungen für das Schiff lassen sich dann Mittelwerte für die erreichbare Geschwindigkeit und den Leistungsbedarf über lange Zeiträume angeben.