cometadata/datacite-rtg-text-other-reclassification-records huggingface dataset:
Resolved and subgrid-scale crossing trajectory effects in Eulerian large eddy simulations of polydisperse droplet transport
Creators: name: Aiyer, Aditya
name: Meneveau, Charles
Publisher: name: arXiv
Year: 2021
Subjects: subject: Fluid Dynamics (physics.flu-dyn)
subject: FOS: Physical sciences

description: We study the dispersion characteristics of slightly buoyant droplets in a turbulent jet using large eddy simulations (LES). The droplet number density fields are represented using an Eulerian approach with the dispersed phase modelled using the Fast-Eulerian method (Ferry & Balachandar 2001) that includes the droplet rise velocity. Radial concentration profiles and turbulent concentration fluxes for droplets of different sizes are analyzed to quantify the "trajectory crossing effect", when relative motions between particles and turbulent eddies tend to reduce turbulent diffusion. For finer LES grid resolutions, the model captures the differential, size based dispersion characteristics of the droplets with the transverse dispersion of the larger droplet sizes suppressed, since trajectory crossing effects are explicitly resolved in LES. We examine a similarity solution model for the size dependent radial concentration profiles based on a modified Schmidt number derived from the theory of turbulent diffusion of particles in the atmosphere proposed by Csanady 1963. The results are validated with the high resolution LES data and show good agreement. Then, the size dependent Schmidt number model is reformulated as a model for unresolved subgrid-scale trajectory crossing effects and used to calculate the subgrid concentration flux in a coarse LES of a turbulent jet, with slightly buoyant droplets injected at the centerline in the self-similar region of the jet. The results are compared to a simulation with higher grid resolution and a coarse simulation with a constant Schmidt number SGS model. We find that the subgrid model enhances the prediction accuracy of the concentration profiles and turbulent concentration flux for the coarse LES.
description: Accepted for publication in the Journal of Fluid Mechanics
Peptidomimetics- Propargylamide-Based Isosteres of Peptide Structures
Creators: name: Wünsch, Matthias
Publisher: name: Universität Bielefeld
Year: 2018
Subjects: subject: 540

description: In medicinal chemistry, the importance of peptidomimetics as small-molecular, orally bioavailable PPI disruptors increases with the structural elucidation of PPI interfaces. However, the design of peptidomimetics, which accurately represent the peptide-template requires a sophisticated diversity of structural devices and reactions. In this thesis, a versatile peptidomimetic scaffold consisting of 3-amino-prop-1-yn-1-yl-benzoates is contributed. This structure is obtained by connection of enantiomerically pure propargylamides with halo-benzoates by Sonogashira cross-coupling. To access a variety of side chains, an array of propargylamides is prepared asymmetrically, comprising all kinds of functional groups (Chapter II).

 Variation of the aromatic substitution pattern, application of heteroarenes and olefins (by hydroalkynylation of propynoates) in the C terminal moiety enables the introduction of versatile side chains and a well-defined curvature in the backbone. Conformational preferences are analyzed by NMR- and CD spectroscopy, MD simulations and X ray crystal structure analysis. Oligomerization of the peptidomimetic scaffolds is performed to investigate their properties as structural helix mimetics. Additionally, interesting dipeptide analogous peptidomimetics with unique properties are presented (Chapter III).

 Particularly rigid peptidomimetic structures based on naphthalene-, biphenyl-, azobenzene- and hydrazine scaffolds direct N and C termini into the same direction and are therefore applied as sterically enforced turn motif mimetics. Their introduction in peptide chains to induce a hairpin formation is studied by 1H NMR spectroscopy, temperature coefficient, CD spectra and X ray structure analysis (Chapter IV).

 para-Substituted peptidomimetics are applied as isosteres of the natural HDAC substrate (e.g. acetylated lysine). By functionalization with a hydroxamic acid, potent HDAC inhibitors can be generated. From a SAR study, interesting information on the influence of the aromatic, the side chain and its configuration on the affinity are derived (Chapter V).

 An arginine analogous propargylamide is linked to different carboxylate moieties by Click reactions giving alkynylarene-, triazole- and amide-based spacers with a similar size as the RGD sequence. These novel RGD isosteres are evaluated by docking experiments, as well as a competitive ELISA based assay (Chapter VI).
Holographic Anomalous Current at a Finite Temperature
Creators: name: Liu, Jian-Guo
name: Miao, Rong-Xin
Publisher: name: arXiv
Year: 2021
Subjects: subject: High Energy Physics - Theory (hep-th)
subject: Other Condensed Matter (cond-mat.other)
subject: General Relativity and Quantum Cosmology (gr-qc)
subject: FOS: Physical sciences

description: Weyl anomaly leads to novel anomalous currents in a spacetime with boundaries. Recently it is found that the anomalous current can be significantly enhanced by the high temperature for free theories, which could make the experimental measurement easier. In this paper, we investigate holographic anomalous currents at a finite temperature. It is found that the holographic current is still enhanced by the high temperature in dimensions higher than three. However, the temperature dependence is quite different from that of free theories. This may be due to the fact that the holographic CFT is strongly coupled and there is non-zero resistance in the holographic model. Remarkably, the temperature dependence of holographic anomalous currents is universal in the high temperature limit, which is independent of the choices of background magnetic fields.
description: 11 pages, 4 figures, published in PLB
The development of university archives in British Columbia: a case study
Creators: name: O’Donnell, Jacqueline P.
Publisher: name: University of British Columbia
Year: 2009

description: This essay attempts to determine how university archives in British Columbia have developed from their origins as collections of historical documents within university libraries, and whether they exemplify the larger trend of archival development evident in Canada. An examination of the history of the National Archives of Canada provides a model of developmental stages and key elements necessary for a modern archival programme. In addition it exemplifies the Canadian tradition of “total archives”. Individual case studies explore the evolution of British Columbia’s three university archives, in the light of this Canadian tradition. Archival programmes located within the University of British Columbia, the University of Victoria and Simon Fraser University are examined, in order to determine how they were conceived, advanced and sustained. An examination of the administrative records of the three university archives including annual reports, correspondence, policies and committee minutes presents a historical overview of their growth and development. Following decades of progress, the emerging picture is one of an incomplete process with each institution having attained a different level of development. The conclusion compares and contrasts the three institutions and assesses their progress in the broader national context of Canadian university archives generally. The state of university archives in British Columbia mirrors that of their national counterparts and the emerging picture is one of an evolution still incomplete.
Darmois matching and $C^3$ matching
Creators: name: Gutiérrez-Piñeres, Antonio Calixto
name: Quevedo, Hernando
Publisher: name: arXiv
Year: 2021
Subjects: subject: General Relativity and Quantum Cosmology (gr-qc)
subject: FOS: Physical sciences

description: We apply the Darmois and the $C^3$ matching conditions to three different spherically symmetric spacetimes. The exterior spacetime is described by the Schwarzschild vacuum solution whereas for the interior counterpart we choose different perfect fluid solutions with the same symmetry. We show that Darmois matching conditions are satisfied in all three cases whereas the $C^3$ conditions are not fulfilled. We argue that this difference is due to a non-physical behavior of the pressure on the matching surface.
description: Replaced with the version matching the published one in CQG
The Source of the Helium Visible Lines in Eta Carinae
Creators: name: Kashi, Amit
name: Soker, Noam
Publisher: name: arXiv
Year: 2007
Subjects: subject: Astrophysics (astro-ph)
subject: FOS: Physical sciences

description: We assume that the helium-I lines emitted by the massive binary system Eta Carinae are formed in the acceleration zone of the less-massive secondary star. We calculate the Doppler shift of the lines as a function of orbital phase and of several parameters of the binary system. We find that a good fit is obtained if the helium lines are formed in the region where the secondary wind speed is 430 km/sec. The acceptable binary eccentricity is in the range 0.9-0.95, and the inclination angle (the angle between a line perpendicular to the orbital plane and the line of sight) is in the range 40-55 degrees. Lower values of e require higher values of i, and vice versa. The binary system is oriented such that the secondary star is in our direction (closer to us) during periastron passage. The orbital motion can account in part to the Doppler shift of the peak in X-ray emission.
description: Accepted by New Astronomy
An even lighter QCD axion
Creators: name: Di Luzio, Luca
name: Gavela, Belen
name: Quilez, Pablo
name: Ringwald, Andreas
Publisher: name: arXiv
Year: 2021
Subjects: subject: High Energy Physics - Phenomenology (hep-ph)
subject: High Energy Physics - Experiment (hep-ex)
subject: High Energy Physics - Theory (hep-th)
subject: FOS: Physical sciences

description: We explore whether the axion which solves the strong CP problem can naturally be much lighter than the canonical QCD axion. The $Z_\mathcal{N}$ symmetry proposed by Hook, with $\mathcal{N}$ mirror and degenerate worlds coexisting in Nature and linked by the axion field, is considered in terms of generic effective axion couplings. We show that the total potential is safely approximated by a single cosine in the large $\mathcal{N}$ limit, and we determine the analytical formula for the exponentially suppressed axion mass. The resulting universal enhancement of all axion interactions relative to those of the canonical QCD axion has a strong impact on the prospects of axion-like particle experiments such as ALPS II, IAXO and many others. The finite density axion potential is also analyzed and we show that the $Z_\mathcal{N}$ asymmetric background of high-density stellar environments sets already significant model-independent constraints: $3\le\mathcal{N}\lesssim47$ for an axion scale $f_a\lesssim 2.4\times10^{15}$ GeV, with tantalizing discovery prospects for any value of $f_a$ and down to $\mathcal{N}\sim9$ with future neutron star and gravitational wave data, down to the ultra-light mass region. In addition, two specific ultraviolet $Z_\mathcal{N}$ completions are developed: a composite axion one and a KSVZ-like model with improved Peccei-Quinn quality.
description: 35 pages and 11 figures; matches JHEP version
Network Analysis of Metabolic Networks
Creators: name: Ντάνης, Χρήστος Αντωνίου
Publisher: name: Aristotle University of Thessaloniki
Year: 2013
Subjects: Network Analysis
Small World
Power Law

description: Στη παρούσα διπλωματική εργασία επιχειρούμε μια εξονυχιστική εξέταση των μεταβολικών δικτύων και εξετάζουμε τη στατιστική τους συμπεριφορά. Κύριο εργαλείο σε αυτή μας την έρευνα είναι η θεωρία δικτύων. Έτσι, ξεκινάμε με μια όσο το δυνατό πιο πλήρη αναφορά στην παραπάνω θεωρία και τις ιδιότητες που την διακατέχουν. Έννοιες όπως μικρόκοσμος, κατανομή των βαθμών του δικτύου αλλά και αυτοομοιότητα εξηγούνται, ενώ για κάθε περίπτωση γίνεται και αναφορά σε συγκεκριμένα παραδείγματα, όπως το Ίντερνετ, ο Παγκόσμιος Ιστός (Web), τα βιολογικά δίκτυα και δίκτυα ανθρωπίνων σχέσεων. Έν’ συνεχεία, γίνεται μια μαθηματική περιγραφή των μεταβολικών δικτύων με την βοήθεια του στοιχειομετρικού πίνακα και αναφέρουμε γενικές ιδιότητες που προκύπτουν από αυτή τη περιγραφή. Στο τρίτο κομμάτι της εργασίας εξετάζουμε συγκεκριμένα μεταβολικά δίκτυα και τις ιδιότητες από τις οποίες αυτά διακατέχονται. Μαζί με αυτά, παραθέτουμε και έναν πίνακα με όλες τις ιδιότητες που σχολιάσαμε πιο πάνω σε συγκεκριμένα μεταβολικά δίκτυα. Τέλος, παραθέτουμε τα συμπεράσματα της μελέτης μας και προβαίνουμε σε έναν γενικό χαρακτηρισμό όλων των μεταβολικών δικτύων.
description: In this thesis, we try to describe the metabolic networks from a mathematical view. In the beginning, we make a brief report to network theory. After that, we describe the general properties of metabolic networks from a biological perspective and give the mathematical background based on stoichiometric matrix. Next, we quote the network properties of 45 metabolic networks with the network properties they have. In the end, we report our conclusions from this research.
Gauge Coupling Unification in Six Dimensions
Creators: name: Lee, Hyun Min
Publisher: name: arXiv
Year: 2006
Subjects: subject: High Energy Physics - Phenomenology (hep-ph)
subject: High Energy Physics - Theory (hep-th)
subject: FOS: Physical sciences

description: We compute the one-loop gauge couplings in six-dimensional non-Abelian gauge theories on the T^2/Z_2 orbifold with general GUT breaking boundary conditions. For concreteness, we apply the obtained general formulae to the gauge coupling running in a 6D SO(10) orbifold GUT where the GUT group is broken down to the standard model gauge group up to an extra U(1). We find that the one-loop corrections depend on the parity matrices encoding the orbifold boundary conditions as well as the volume and shape moduli of extra dimensions. When the U(1) is broken by the VEV of bulk singlets, the accompanying extra color triplets also affect the unification of the gauge couplings. In this case, the B-L breaking scale compatible with the gauge coupling unification is sensitive to the change of the compactification scales.
description: 32 pages, 4 figures, errors in the KK sums changing the consequent discussion on the 5D limit corrected
Search for a heavy vector resonance decaying to a Z boson and a Higgs boson in proton-proton collisions at $\sqrt{s} = $ 13 TeV
Creators: name: CMS Collaboration
Publisher: name: arXiv
Year: 2021
Subjects: subject: High Energy Physics - Experiment (hep-ex)
subject: FOS: Physical sciences

description: A search is presented for a heavy vector resonance decaying into a Z boson and the standard model Higgs boson, where the Z boson is identified through its leptonic decays to electrons, muons, or neutrinos, and the Higgs boson is identified through its hadronic decays. The search is performed in a Lorentz-boosted regime and is based on data collected from 2016 to 2018 at the CERN LHC, corresponding to an integrated luminosity of 137 fb$^{-1}$. Upper limits are derived on the production of a narrow heavy resonance Z', and a mass below 3.5 and 3.7 TeV is excluded at 95% confidence level in models where the heavy vector boson couples exclusively to fermions and to bosons, respectively. These are the most stringent limits placed on the Heavy Vector Triplet Z' model to date. If the heavy vector boson couples exclusively to standard model bosons, upper limits on the product of the cross section and branching fraction are set between 23 and 0.3 fb for a Z' mass between 0.8 and 4.6 TeV, respectively. This is the first limit set on a heavy vector boson coupling exclusively to standard model bosons in its production and decay.
description: Replaced with the published version. Added the journal reference and the DOI. All the figures and tables can be found at http://cms-results.web.cern.ch/cms-results/public-results/publications/B2G-19-006 (CMS Public Pages)
Η αναγνώριση και εκτέλεση αλλοδαπών αποφάσεων κατά το τουρκικό δίκαιο
Creators: name: Τζάννος, Νικόλαος Βασιλείου
Publisher: name: Aristotle University of Thessaloniki
Year: 2013
Subjects: Αναγνώριση
Εκτέλεση
Αποφάσεων
Τουρκικό
Recognition
Enforcement
Judgments
Turkish

description: Σκοπός της παρούσας διπλωματικής εργασίας είναι η μελέτη του τουρκικού ιδιωτικού διεθνούς δικαίου σχετικά με την αναγνώριση και εκτέλεση αλλοδαπών δικαστικών και διαιτητικών αποφάσεων. Επιχειρείται η παρουσίαση των προϋποθέσεων για την αναγνώριση και εκτέλεση των αλλοδαπών αποφάσεων στην Τουρκία σύμφωνα με το τουρκικό δίκαιο, μέσα από τις πηγές του, καθώς και με αναφορές στην ερμηνεία και την εφαρμογή του, όπως προκύπτει από τη θεωρία και ιδίως τη νομολογία. Συγκεκριμένα, η διατριβή εστιάζει κυρίως στην ανάπτυξη του βασικού σχετικού τουρκικού νομοθετήματος, του Κώδικα Ιδιωτικού Διεθνούς και Δικονομικού Δικαίου (ΜÖHUK) και πέραν αυτού περιορίζεται σε μία σύντομη αναφορά στις ισχύουσες στην Τουρκία πολυμερείς διεθνείς συνθήκες. Μέσα από μία κατ’ άρθρον παράθεση των σχετικών διατάξεων του ΜÖHUK, εξετάζονται οι προϋποθέσεις αναγνώρισης και εκτέλεσης κατά το τουρκικό δίκαιο, με παράλληλη μελέτη τόσο της θεωρίας όσο και επιλεγμένης νομολογίας, ενώ, όταν αυτό είναι δυνατό, γίνεται προσπάθεια για αντιπαραβολή των πρόσφατων ρυθμίσεων με τις αντίστοιχες διατάξεις του προϊσχύσαντος δικαίου. Τέλος, το τελευταίο κεφάλαιο αφιερώνεται στην αναγνώριση των αλλοδαπών διαιτητικών αποφάσεων, με μία σύντομη έκθεση των προϋποθέσεων που τίθενται από το ΜÖHUK, χωρίς να παραλείπεται και πάλι η παραπομπή στην ερμηνεία τους, όπως αυτή αποκρυσταλλώθηκε τις τελευταίες δεκαετίες από την τουρκική θεωρία και νομολογία.
description: The aim of the present dissertation is the study of the Turkish private international law regarding the recognition and enforcement of foreign court and arbitration judgments. It is attempted to present the conditions of recognition and enforcement of foreign judgements in Turkey according to the Turkish law, through its sources, as well as with references to its interpretation and application by legal doctrine and jurisprudence. More precisely, the thesis focuses especially on the presentation of the main relative Turkish law, the Code on Private International and Procedural Law (ΜÖHUK) and beyond that there is a brief reference to multilateral conventions currently in force in Turkey. An examination of the conditions regarding the recognition and enforcement of foreign court judgements is achieved through a presentation of the related articles of ΜÖHUK, with a parallel study of both legal doctrine and selected jurisprudence, as well as by evaluating the new provisions in contrast to the corresponding former ones, when that is possible. Finally, the last chapter is dedicated to the recognition of foreign arbitral awards, with an attempt to display in short the conditions required by ΜÖHUK, also without missing out a reference to their interpretation, as it has been formed by Turkish legal doctrine and jurisprudence during the last decades.
A Plausible Model for a Photon by Linear Polarization
Creators: name: Schulz, Petra
Publisher: name: arXiv
Year: 2006
Subjects: subject: General Physics (physics.gen-ph)
subject: FOS: Physical sciences

description: A plausible photon model is presented. The model is based on the idea that photon and particle must have the same structure. The linear polarization is interpreted under the assumption that vibration photons interact with the particles in the polarizer/analyzer. Slantwise flying photons are separated by the particles of the dichroic or double-refracting material into two components because a vibration component is absorbed and the other one is let through inevitably. The vibrations are explained by example of the carbonate ion of calcite. ----- Es wird ein plausibles Photonenmodell vorgelegt. Das Modell basiert auf der Vorstellung, dass Photon und Teilchen die gleiche Struktur haben muessen. Lineare Polarisation wird gedeutet unter der Annahme, dass von den Teilchen im Polarisator/Analysator Schwingungsphotonen aufgenommen werden. Bei schraegem Einschuss der Photonen werden sie von den Teilchen des dichroitischen oder doppelbrechenden Materials in zwei Komponenten getrennt, weil eine Schwingungskomponente absorbiert wird und die andere zwangslaeufig durchgelassen wird. Die Schwingungen werden am Beispiel des Carbonat-Ions von Calcit erlaeutert.
description: 8 pages, 9 figures, in German
Visibility network analysis of large-scale intermittency in convective surface layer turbulence
Creators: name: Chowdhuri, Subharthi
name: Iacobello, Giovanni
name: Banerjee, Tirtha
Publisher: name: arXiv
Year: 2021
Subjects: subject: Fluid Dynamics (physics.flu-dyn)
subject: Geophysics (physics.geo-ph)
subject: FOS: Physical sciences

description: Large-scale intermittency is a widely observed phenomenon in convective surface layer turbulence that induces non-Gaussian temperature statistics, while such signature is not observed for velocity signals. Although approaches based on probability density functions have been used so far, those are not able to explain to what extent the signals' temporal structure impacts the statistical characteristics of the velocity and temperature fluctuations. To tackle this issue, a visibility network analysis is carried out on a field-experimental dataset from a convective atmospheric surface layer flow. Through surrogate data and network-based measures, we demonstrate that the temperature intermittency is related to strong non-linear dependencies in the temperature signals. Conversely, a competition between linear and non-linear effects tends to inhibit the temperature-like intermittency behaviour in streamwise and vertical velocities. Based on present findings, new research avenues are likely to be opened up in studying large-scale intermittency in convective turbulence.
description: 4 figures
Particle physics processes in cosmology through an effective Minkowski space formulation and the limitations of the method
Creators: name: Erdem, Recai
name: Gultekin, Kemal
Publisher: name: arXiv
Year: 2021
Subjects: subject: General Relativity and Quantum Cosmology (gr-qc)
subject: High Energy Physics - Theory (hep-th)
subject: FOS: Physical sciences

description: We introduce a method where particle physics processes in cosmology may be calculated by the usual perturbative flat space quantum field theory through an effective Minkowski space description at small time intervals provided that the running of the effective particle masses are sufficiently slow. We discuss the necessary conditions for the applicability of this method and illustrate the method through a simple example. This method has the advantage of avoiding the effects of gravitational particle creation in the calculation of rates and cross sections i.e. giving directly the rates and the cross sections due to the scatterings or the decay processes.
description: Some comments for further clarification of the content and the scope of the paper are added in the light of the comments of the anonymous referee. Typos are fixed. arXiv admin note: text overlap with arXiv:1908.08784
Magneto-rotational dissociation of heavy hadrons in Relativistic Heavy-Ion Collisions
Creators: name: Tuchin, Kirill
Publisher: name: arXiv
Year: 2021
Subjects: subject: High Energy Physics - Phenomenology (hep-ph)
subject: Solar and Stellar Astrophysics (astro-ph.SR)
subject: Nuclear Theory (nucl-th)
subject: FOS: Physical sciences

description: A heavy hadron traversing Quark-Gluon Plasma and dragged along in rotational motion is subject to the Lorentz and centrifugal forces. The Lorentz force, sourced by the valence quarks of heavy-ions, possesses the electric and magnetic components in the hadron comoving frame. The electric component renders the hadron unstable by empowering one of its quarks to tunnel through the potential barrier. Assuming that the magnetic field is parallel to the plasma vorticity, the hadron dissociation probability is computed using the Imaginary Time Method and is found to strongly depend on the sign of the quark electric charge. The dissociation probability monotonically increases as a function of vorticity for negative electric charges, whereas for positive charges it exhibits a minimum at a finite value of vorticity. The dissociation probability for the negative charges is larger than for the positive ones at the same magnetic field and vorticity. In relativistic heavy-ion collisions this implies lower abundance of the negatively charged hadrons as compared to the positively charges ones. This effect is significant at moderate collision energies where the plasma vorticity is comparable or larger than the synchrotron frequency.
description: 13 pages, 4 figures; v2: expanded and corrected
Counterdiabaticity and the quantum approximate optimization algorithm
Creators: name: Wurtz, Jonathan
name: Love, Peter J.
Publisher: name: arXiv
Year: 2021
Subjects: subject: Quantum Physics (quant-ph)
subject: FOS: Physical sciences

description: The quantum approximate optimization algorithm (QAOA) is a near-term hybrid algorithm intended to solve combinatorial optimization problems, such as MaxCut. QAOA can be made to mimic an adiabatic schedule, and in the $p\to\infty$ limit the final state is an exact maximal eigenstate in accordance with the adiabatic theorem. In this work, the connection between QAOA and adiabaticity is made explicit by inspecting the regime of $p$ large but finite. By connecting QAOA to counterdiabatic (CD) evolution, we construct CD-QAOA angles which mimic a counterdiabatic schedule by matching Trotter "error" terms to approximate adiabatic gauge potentials which suppress diabatic excitations arising from finite ramp speed. In our construction, these "error" terms are helpful, not detrimental, to QAOA. Using this matching to link QAOA with quantum adiabatic algorithms (QAA), we show that the approximation ratio converges to one at least as $1-C(p)\sim 1/p^μ$. We show that transfer of parameters between graphs, and interpolating angles for $p+1$ given $p$ are both natural byproducts of CD-QAOA matching. Optimization of CD-QAOA angles is equivalent to optimizing a continuous adiabatic schedule. Finally, we show that, using a property of variational adiabatic gauge potentials, QAOA is at least counterdiabatic, not just adiabatic, and has better performance than finite time adiabatic evolution. We demonstrate the method on three examples: a 2 level system, an Ising chain, and the MaxCut problem.
description: 27 pages, 6 figures
Dynamical properties of z $\sim 4.5$ dusty star-forming galaxies and their connection with local early type galaxies
Creators: name: Rizzo, Francesca
name: Vegetti, Simona
name: Fraternali, Filippo
name: Stacey, Hannah
name: Powell, Devon
Publisher: name: arXiv
Year: 2021
Subjects: subject: Astrophysics of Galaxies (astro-ph.GA)
subject: Cosmology and Nongalactic Astrophysics (astro-ph.CO)
subject: FOS: Physical sciences

description: There is a large consensus that gas in high-$z$ galaxies is highly turbulent, because of a combination of stellar feedback processes and gravitational instabilities driven by mergers and gas accretion. In this paper, we present the analysis of a sample of five Dusty Star Forming Galaxies (DSFGs) at $4 \lesssim z\lesssim 5$. Taking advantage of the magnifying power of strong gravitational lensing, we quantified their kinematic and dynamical properties from ALMA observations of their [CII] emission line. We combined the dynamical measurements obtained for these galaxies with those obtained from previous studies to build the largest sample of $z \sim 4.5$ galaxies with high-quality data and sub-kpc spatial resolutions, so far. We found that all galaxies in the sample are dynamically cold, with rotation-to-random motion ratios, $V/σ$, between 7 to 15. The relation between their velocity dispersions and their star-formation rates indicates that stellar feedback is sufficient to sustain the turbulence within these galaxies and no further mechanisms are needed. In addition, we performed a rotation curve decomposition to infer the relative contribution of the baryonic (gas, stars) and dark matter components to the total gravitational potentials. This analysis allowed us to compare the structural properties of the studied DSFGs with those of their descendants, the local early type galaxies. In particular, we found that five out of six galaxies of the sample show the dynamical signature of a bulge, indicating that the spheroidal component is already in place at $z \sim 4.5$.
description: 34 pages (including appendices), 10 figures, 8 tables; accepted for publication in MNRAS
A simply connected surface of general type with p_g=0 and K^2=4
Creators: name: Park, Heesang
name: Park, Jongil
name: Shin, Dongsoo
Publisher: name: arXiv
Year: 2008
Subjects: subject: Algebraic Geometry (math.AG)
subject: Geometric Topology (math.GT)
subject: FOS: Mathematics
subject: 14J29, 14J10, 14J17, 53D05

description: As the sequel to [5, 7], we construct a simply connected minimal complex surface of general type with p_g = 0 and K^2 = 4 by using a rational blow-down surgery and Q-Gorenstein smoothing theory.
description: 9 pages, 7 figures. More examples are provided
Knot Floer homology of Whitehead doubles
Creators: name: Hedden, Matthew
Publisher: name: arXiv
Year: 2006
Subjects: subject: Geometric Topology (math.GT)
subject: Symplectic Geometry (math.SG)
subject: FOS: Mathematics
subject: 57M27, 57R58

description: In this paper we study the knot Floer homology invariants of the twisted and untwisted Whitehead doubles of an arbitrary knot K. We present a formula for the filtered chain homotopy type of HFK(D(+,K,t)) in terms of the invariants for K, where D(+,K,t) denotes the t-twisted positive-clasped Whitehead double of K. In particular, the formula can be used iteratively and can be used to compute the Floer homology of manifolds obtained by surgery on Whitehead doubles. An immediate corollary is that tau(D(+,K,t))=1 if t< 2tau(K) and zero otherwise, where tau is the Ozsv{á}th-Szab{ó} concordance invariant. It follows that the iterated untwisted Whitehead doubles of a knot satisfying tau(K)>0 are not smoothly slice.
description: 41 pages, 14 color figures. spelling errors corrected and other minor changes
Questionnaire sur l'évaluation quantitative de la qualité de vie des populations vivant dans les territoires fluvio-estuariens ou littoraux
Creators: name: Lyser, Sandrine
name: Joalland, Olivier
Publisher: name: Zenodo
Year: 2015
Subjects: questionnaire
enquête
bien-être subjectif
qualité de vie
littoral
survey
subjective well-being (SWB)
quality of life

description: Questionnaire d'enquête portant sur les perceptions relatives aux différentes composantes de la qualité de vie des habitants à l’échelle de leur territoire de vie. Il a été administré par téléphone et internet au cours de la période estivale 2014, à l’échelle du complexe litto-estuarien de la Gironde. Il a été conçu dans le cadre du projet de recherche ­­« Vulnérabilité de l’Estuaire de la Gironde et Gouvernance des Aménagements » (VEGGA), coordonné par Tina Rambonilaza. Ce projet a été financé par le programme Eaux et Territoires. English description Survey questionnaire on the subjective perceptions of the different components of quality of life of inhabitants, living in the urban region of Bordeaux and its rural and peripheral areas. It was administered by phone and online, during summer 2014.

 It was designed for the research project VEGGA, coordinated by Tina Rambonilaza. This project received funding from the French ministry of Ecology, Sustainable Development and Energy, in the "Eaux et Territoires" research program.
Data from the article: Vortex-dominated aeolian activity at InSight's landing site, Part 1: Multi-instrument Observations, Analysis and Implications
Creators: name: Charalambous, Constantinos
Publisher: name: Zenodo
Year: 2021
Subjects: aeolian changes
mars
InSight

description: This repository contains processed and derived data from the article: Charalambous, C., et al. "Vortex-dominated aeolian activity at InSight's landing site, Part 1: Multi-instrument Observations, Analysis and Implications" (2021) JGR Planets. This dataset is derived from SEIS, APSS, IFG and IDC/ICC raw data available at the following: InSight Mars SEIS Data Service (2019) doi: 10.18715/SEIS.INSIGHT.XB_2016
 SEIS Bundle with doi: 10.17189/1517570
 APSS TWINS Bundle with doi: 10.17189/1518950
 APSS PS Bundle with doi: 10.17189/151893
 IFG Mars Bundle with doi: 10.17189/1519202
 IDC/ICC Bundle with doi: 10.17189/1510484
Galilean $W_3$ algebra
Creators: name: Radobolja, Gordan
Publisher: name: arXiv
Year: 2021
Subjects: subject: Quantum Algebra (math.QA)
subject: Mathematical Physics (math-ph)
subject: Representation Theory (math.RT)
subject: FOS: Mathematics
subject: FOS: Physical sciences
subject: 17B69, 17B68, 81R10

description: Galilean $W_3$ vertex operator algebra $\mathcal GW_3(c_L,c_M)$ is constructed as a universal enveloping vertex algebra of certain non-linear Lie conformal algebra. It is proved that this algebra is simple by using determinant formula of the vacuum module. Reducibility criterion for Verma modules is given, and the existence of subsingular vectors demonstrated. Free field realisation of $\mathcal GW_3(c_L,c_M)$ and its highest weight modules is obtained within a rank 4 lattice VOA.
description: 24 pages
Η έκτακτη χρησικτησία και η λειτουργία της στο πλαίσιο των συστημάτων των βιβλίων μεταγραφών και του κτηματολογίου
Creators: name: Σιαμέτης, Σωκράτης Νικολάου
Publisher: name: Aristotle University of Thessaloniki
Year: 2013
Subjects: Χρησικτησία
Βιβλία μεταγραφών
Κτηματολόγιο
Usucaption
Transcription books
Cadastre

description: Σκοπός της εργασίας είναι η μελέτη της έκτακτης χρησικτησίας και της λειτουργίας της στα συστήματα των βιβλίων μεταγραφών και του κτηματολογίου. Στο πρώτο κεφάλαιο αυτής γίνεται αναφορά στις προϋποθέσεις και στις έννομες συνέπειες κτήσης εμπράγματου δικαιώματος με έκτακτη χρησικτησία. Στο δεύτερο κεφάλαιο παρουσιάζονται ειδικές περιπτώσεις έκτακτης χρησικτησίας. Το τρίτο κεφάλαιο της εργασίας αφορά στη λειτουργία της έκτακτης χρησικτησίας στο σύστημα των βιβλίων μεταγραφών, ενώ το τέταρτο ασχολείται με τη λειτουργία της στο Εθνικό Κτηματολόγιο.
description: The purpose of this paper is to study the exceptional usucaption and its functionality in the systems of transcription books and the cadastre. The first chapter refers to the conditions and the legal consequences of real right ownership with exceptional usucaption. The second chapter presents special cases of exceptional usucaption. The third chapter of this work concerns the function of the exceptional usucaption in the transcription books, while the fourth deals with its operation in the National Cadastre.
Gauss-Bonnet Quintessence: Background Evolution, Large Scale Structure and Cosmological Constraints
Creators: name: Koivisto, Tomi
name: Mota, David F.
Publisher: name: arXiv
Year: 2006
Subjects: subject: High Energy Physics - Theory (hep-th)
subject: Astrophysics (astro-ph)
subject: General Relativity and Quantum Cosmology (gr-qc)
subject: High Energy Physics - Phenomenology (hep-ph)
subject: FOS: Physical sciences

description: We investigate a string-inspired dark energy scenario featuring a scalar field with a coupling to the Gauss-Bonnet invariant. Such coupling can trigger the onset of late dark energy domination after a scaling matter era. The universe may then cross the phantom divide and perhaps also exit from the acceleration. We discuss extensively the cosmological and astrophysical implications of the coupled scalar field. Data from the Solar system, supernovae Ia, cosmic microwave background radiation, large scale structure and big bang nucleosynthesis is used to constrain the parameters of the model. A good Newtonian limit may require to fix the coupling. With all the data combined, there appears to be some tension with the nucleosynthesis bound, and the baryon oscillation scale seems to strongly disfavor the model. These possible problems might be overcome in more elaborate models. In addition, the validity of these constraints in the present context is not strictly established. Evolution of fluctuations in the scalar field and their impact to clustering of matter is studied in detail and more model-independently. Small scale limit is derived for the perturbations and their stability is addressed. A divergence is found and discussed. The general equations for scalar perturbations are also presented and solved numerically, confirming that the Gauss-Bonnet coupling can be compatible with the observed spectrum of cosmic microwave background radiation as well as the matter power spectrum inferred from large scale surveys.
description: 20 pages, 21 figures. New figures and new matterial is included to the astrophysical constraint sections. Several disscussions were extended and improved. Abstract rewriten to comply with the new material in the text. Typos corrected. References added
Phospholipase c beta 1 (PLCb1) in acute myeloid leukemia (AML): a novel potential therapeutic target
Creators: name: Fiume, Roberta
name: Huang, Xu
name: Ramazzotti, Giulia
name: Mongiorgi, Sara
name: Santi, Patrizia
name: Somervaille, Tim
name: Divecha, Nullin
Publisher: name: Italian Journal of Anatomy and Embryology
Year: 2015

description: Acute myeloid leukemia (AML) is the most common type of leukemia in adults in which leukemic myeloid derived cells replace normal blood cells leading to a loss in systemic function. Once initiated the disease develops rapidly and is typically fatal within weeks or months if left untreated. AML is a complex disease and although, the exact causes of the development of AML are unknown, risk factors include age, pre-leukemic diseases such as myelodysplastic syndrome, exposure to chemicals and radiation and genetics. The mainstay treatment is still chemotherapy together with stem cell replacement therapy and while life expectancy has increased slowly, the 5 year survival rates range between 12 and 70% with relapse rates as high as 70% depending on the subtype (canceruk). These statistics illustrate the urgent requirement for the development of novel targeted therapeutics. Phospholipases C (PLC) are critical intracellular signaling enzymes that control a wide range of cellular functions including proliferation and apoptosis that have been implicated in myelodysplastic diseases and in leukemia (Faenza et al., 2013; Shah et al.). Importantly they constitute a highly druggable family of enzymes distinct from other well established drug development targets such as protein kinases. Using the human leukemic cell line THP1, we carried out a small targeted RNAi screen to establish a role of all known PLCs in cell growth, differentiation and maintenance of the transformed phenotype. We discovered that silencing of PLCb1 or PLCH2 resulted in a strong growth arrest. PLCb1 knockdown also initiated apoptosis and attenuated growth of THP1 cells in semisolid culture, which is known to reflect the ability of cells to induce leukemia in vivo. Accordingly, we found that knockdown of PLCb1 strongly attenuated THP1-mediated development of leukemia in mice. These growth inhibitory effects of PLCb1 knockdown were extended to a mouse model of human leukaemia induced by the MLL-AF9 translocation and to human primary leukemia cells. Of direct importance to the consideration for drug development we observed that PLCb1 knockdown selectively attenuated the growth of primary human AML cells, without effecting cell growth and differentiation of normal CD34+ hematopoietic stem and progenitor cells from healthy donors. We therefore propose PLCb1 as a novel candidate for a therapeutic target in AML.
description: Italian Journal of Anatomy and Embryology, Vol 119, No 1 (Supplement) 2014
Segmentation Algorithms for Ground-Based Infrared Cloud Images
Creators: name: Terrén-Serrano, Guillermo
name: Martínez-Ramón, Manel
Publisher: name: arXiv
Year: 2021
Subjects: subject: Image and Video Processing (eess.IV)
subject: FOS: Electrical engineering, electronic engineering, information engineering

description: The increasing number of Photovoltaic (PV) systems connected to the power grid are vulnerable to the projection of shadows from moving clouds. Global Solar Irradiance (GSI) forecasting allows smart grids to optimize the energy dispatch, preventing energy shortages caused by occlusion of the sun. This investigation compares the performances of machine learning algorithms (not requiring labelled images for training) for real-time segmentation of clouds in images acquired using a ground-based infrared sky imager. Real-time segmentation is utilized to extract cloud features using only the pixels in which clouds are detected.
Η επάρκεια της βασικής κατάρτισης των εκπαιδευτικών στην ειδική αγωγή: απόψεις εκπαιδευτικών ειδικής αγωγής
Creators: name: Σατίδου, Μαρία Bασιλείου
Publisher: name: Aristotle University of Thessaloniki
Year: 2013
Subjects: Ειδικός παιδαγωγός
Εκπαίδευση ειδικών παιδαγωγών
Ειδική αγωγή
Special educator
Special educator's training
Special education

description: Ο ρόλος του ειδικού παιδαγωγού είναι πολύ σημαντικός για την εξέλιξη των ατόμων με ειδικές εκπαιδευτικές ανάγκες, καθώς είναι ένας από τους ανθρώπους που εμπλέκονται στην εκπαίδευσή τους. Πιο συγκεκριμένα, θα πρέπει να είναι κατάλληλα καταρτισμένος τόσο για την επιτυχή σχολική ενσωμάτωση των μαθητών όσο και για τη μετέπειτα κοινωνική τους ένταξη. Σκοπός της παρούσας έρευνας είναι να διαπιστωθεί σε ποιο βαθμό οι εκπαιδευτικοί της Ειδικής Αγωγής που διδάσκουν σε σχολεία με μαθητές με ειδικές ανάγκες είναι επαρκώς καταρτισμένοι για το εκπαιδευτικό τους έργο. Για τους σκοπούς της παρούσας έρευνας, η ανάλυση των δεδομένων της πραγματοποιήθηκε μέσω της ποιοτικής ανάλυσης περιεχομένου, η οποία δίνει τη δυνατότητα στον ερευνητή να διεισδύσει στην προσωπικότητα των υποκειμένων και με τη χρήση του μεθοδολογικού εργαλείου της συνέντευξης συλλέχθηκαν σημαντικές πληροφορίες που αφορούσαν τις εμπειρίες, τις απόψεις και τις στάσεις των συμμετεχόντων.
description: The role of the special educator is very important for the development of people with special educational needs, is one of the people involved in their education. Specifically, special teachers should be properly trained both for successful school integration of pupils and for their subsequent social integration. The purpose of this research is to determine to what extent the special education teachers who teach in schools with students with special needs are adequately trained for their educational work. For the purposes of this research, the data analysis was carried out through qualitative content analysis, which enables the researcher to penetrate the personality of subjects and using the methodological tool of the interview collected important information concerning their experiences, views and attitudes of the participants.
Path integral formulation for quantum nonadiabatic dynamics and the mixed quantum-classical limit
Creators: name: Krishna, Vinod
Publisher: name: arXiv
Year: 2007
Subjects: subject: Chemical Physics (physics.chem-ph)
subject: Materials Science (cond-mat.mtrl-sci)
subject: Quantum Physics (quant-ph)
subject: FOS: Physical sciences

description: This work identifies geometric effects on dynamics due to nonadiabatic couplings in Born Oppenheimer systems and provides a systematic method for deriving corrections to mixed quantum-classical methods. Specifically, an exact path integral formulation of the quantum nonadiabatic dynamics of Born Oppenheimer systems is described. Stationary phase approximations to the propagator for full quantum dynamics are derived. It is shown that quantum corrections to mixed quantum classical methods can be obtained through stationary phase approximations to the full quantum dynamics. A rigorous description of the quantum corrections due to electronic nonadiabatic coupling on the nuclear dynamics within the Ehrenfest framework is obtained. The fewest switches surface hopping method is shown to be obtained as a quasiclassical approximation to the dynamics and natural semiclassical extensions to include classically forbidden nonadiabatic transitions are suggested.
description: 26 pages, 2 figures. Accepted for publication, Journal of Chemical Physics
Update on Material Logistic Concept. Simulation assumptions, processes and parameters. Preliminary results
Creators: name: Müller, Benedikt Oliver
name: Schreiber, Lucas
name: :Unav
Publisher: name: Fraunhofer-Gesellschaft
Year: 2023
Subjects: CERN
Future Circular Collider
preliminary logistic study
simulating model
material flow simulation
underground tunnel
key performance indicators

description: After collecting all the requirements from the different users, a preliminary logistic study has been conducted with the purpose of simulating the material flow and the installation operations for the magnets of the collider ring and booster ring in the underground tunnel; the study analysed several scenarios based on different boundary conditions such as the number of shafts available for the transfer of magnets and the number of transport vehicles. For each scenario, the simulation tool provided key performance indicators such as the overall installation time and process bottlenecks which will be of crucial importance for the definition of the overall project schedule. The presentation will give an overview of the simulation model used, the scenarios that have been assessed and the related results. For the future it is planned to expand the simulation to include other materials of the technical infrastructure.
Exploring the GRB population: Robust afterglow modelling
Creators: name: Aksulu, M. D.
name: Wijers, R. A. M. J.
name: van Eerten, H. J.
name: van der Horst, A. J.
Publisher: name: arXiv
Year: 2021
Subjects: subject: High Energy Astrophysical Phenomena (astro-ph.HE)
subject: FOS: Physical sciences

description: Gamma-ray bursts (GRBs) are ultra-relativistic collimated outflows, which emit synchrotron radiation throughout the entire electromagnetic spectrum when they interact with their environment. This afterglow emission enables us to probe the dynamics of relativistic blast waves, the microphysics of shock acceleration, and environments of GRBs. We perform Bayesian inference on a sample of GRB afterglow data sets consisting of 22 long GRBs and 4 short GRBs, using the afterglow model "scalefit", which is based on 2D relativistic hydrodynamic simulations. We make use of Gaussian processes to account for systematic deviations in the data sets, which allows us to obtain robust estimates for the model parameters. We present the inferred parameters for the sample of GRBs, and make comparisons between short GRBs and long GRBs in constant-density and stellar-wind-like environments. We find that in almost all respects such as energy and opening angle, short and long GRBs are statistically the same. Short GRBs however have a markedly lower prompt $γ$-ray emission efficiency than long GRBs. We also find that for long GRBs in ISM-like ambient media there is a significant anti-correlation between the fraction of thermal energy in the magnetic fields, $ε_B$, and the beaming corrected kinetic energy. Furthermore, we find no evidence that the mass-loss rates of the progenitor stars are lower than those of typical Wolf-Rayet stars.
description: Submitted to MNRAS. Accepted 2022 January 17. Received 2021 December 29; in original form 2021 June 28