cometadata/datacite-rtg-text-other-reclassification-records huggingface dataset:
title: Geostatistical Analysis of permeability data
Creators: name: Γεωργουσακης Κωνσταντινος
Publisher: name: Technical University of Crete
Year: 2017

description: Properties such as porosity and permeability are of utmost significance in petroleum industry. They are important parameters for both reservoir engineering and reservoir modelling, since they constitute the basis upon which hydrocarbon reserves, as well as hydrocarbon flow characteristics are determined. For that reason, accurate estimation of these properties has been the subject of continuous studies.

For the purposes of this thesis, the porosity and permeability data provided by the 10th SPE benchmark reservoir model were used. This model is part of the PUNQ Complex Model and is a highly heterogeneous model, consisting of two parts: A relatively permeable Tarbert formation on top and an Upper Ness formation at the bottom. The latter comprises of permeable anastomosed channels laid on a non–permeable background. The data were analysed using visualization, statistical and geostatistical techniques, in order to investigate the statistical properties and to subsequently quantify and evaluate their spatial correlation and variability.

The exploratory analysis was carried out using classical statistics (e.g., histograms, statistical moments, distribution fitting and scatter plots). However, the main results were derived using geostatistical methods. Geostatistical analysis included the calculation of various variograms (i.e., directional, anisotropic, omnidirectional and 3D variograms), and their subsequent fitting with appropriate theoretical variogram models. In addition to this analysis, an upscaling of the reservoir model was performed by implementing the Simplified Renormalization method to both porosity and permeability data.

Various conclusions were drawn from this project concerning the behaviour and spatial correlation of the reservoir, as well as the general implementation of the geostatistical methods. The most important outcome was the confirmation of the high heterogeneity and anisotropy characterizing the entire reservoir model. An equally significant observation was that results depend greatly on the number and locations of data included. More specifically, considering more data across the horizontal plane increases the interpretable information of variogram analysis, while considering more data along the vertical direction increases the variability. Finally, upscaling leads to coarse–grained versions of the reservoir model; such reduced dimensionality models should be further evaluated by means of subsequent flow simulation.
Imaging the ultrafast coherent control of a skyrmion crystal
Creators: name: Tengdin, Phoebe
name: Truc, Benoit
name: Sapozhnik, Alexey
name: Kong, Lingyao
name: del Ser, Nina
name: Gargiulo, Simone
name: Madan, Ivan
name: Schoenenberger, Thomas
name: Baral, Priya R.
name: Che, Ping
name: Magrez, Arnaud
name: Grundler, Dirk
name: Rønnow, Henrik M.
name: Lagrange, Thomas
name: Zang, Jiadong
name: Rosch, Achim
name: Carbone, Fabrizio
Publisher: name: arXiv
Year: 2021
Subjects: subject: Strongly Correlated Electrons (cond-mat.str-el)
subject: Materials Science (cond-mat.mtrl-sci)
subject: FOS: Physical sciences

description: Exotic magnetic textures emerging from the subtle interplay between thermodynamic and topological fluctuation have attracted intense interest due to their potential applications in spintronic devices. Recent advances in electron microscopy have enabled the imaging of random photo-generated individual skyrmions. However, their deterministic and dynamical manipulation is hampered by the chaotic nature of such fluctuations and the intrinsically irreversible switching between different minima in the magnetic energy landscape. Here, we demonstrate a method to coherently control the rotation of a skyrmion crystal by discrete amounts at speeds which are much faster than previously observed. By employing circularly polarized femtosecond laser pulses with an energy below the bandgap of the Mott insulator Cu2OSeO3, we excite a collective magnon mode via the inverse Faraday effect. This triggers coherent magnetic oscillations that directly control the rotation of a skyrmion crystal imaged by cryo-Lorentz Transmission Electron Microscopy. The manipulation of topological order via ultrafast laser pulses shown here can be used to engineer fast spin-based logical devices.
Gerhard Bauchhenss: Die große luppitersäule aus Mainz. Corpus Signorum Imperii Romani. Corpus der Skulpturen der römischen Welt: Deutschland Bd. II, 2 / Denkmäler des Iuppiterkultes aus Mainz und Umgebung. Corpus Signorum Imperii Romani. Corpus der Skulpturen der römischen Welt: Deutschland Bd. II, 3. Bonn 1984
Creators: name: Klee, Margot
Publisher: name: Fundberichte aus Baden-Württemberg
Year: 2017

description: Rezension zu: Gerhard Bauchhenss: Die große luppitersäule aus Mainz. Corpus Signorum Imperii Romani. Corpus der Skulpturen der römischen Welt: Deutschland Bd. II, 2. Germania Superior. Verlag des Römisch-Germanischen Zentralmuseums in Kommission bei Dr. Rudolf Habelt GmbH, Bonn 1984. VIII, 37 Seiten, 1 Frontispiz, 19 Abbildungen, 36 Tafeln.

Gerhard Bauchhenss: Denkmäler des Iuppiterkultes aus Mainz und Umgebung. Corpus Signorum Imperii Romani. Corpus der Skulpturen der römischen Welt: Deutschland Bd. II, 3. Germania Superior. Verlag des Römisch-Germanischen Zentralmuseums in Kommission bei Dr. Rudolf Habelt GmbH, Bonn 1984. VIII, 95 Seiten, 1 Frontispiz, 15 Abbildungen, 128 Tafeln.
description: Fundberichte aus Baden-Württemberg, Bd. 13 (1988): Fundberichte aus Baden-Württemberg
Equivariant Poincaré-Alexander-Lefschetz duality and the Cohen-Macaulay property
Creators: name: Allday, Christopher
name: Franz, Matthias
name: Puppe, Volker
Publisher: name: arXiv
Year: 2013
Subjects: subject: Algebraic Topology (math.AT)
subject: FOS: Mathematics
subject: 55N91 (Primary) 13C14, 57R91 (Secondary)

description: We prove a Poincare-Alexander-Lefschetz duality theorem for rational torus-equivariant cohomology and rational homology manifolds. We allow non-compact and non-orientable spaces. We use this to deduce certain short exact sequences in equivariant cohomology, originally due to Duflot in the differentiable case, from similar, but more general short exact sequences in equivariant homology. A crucial role is played by the Cohen-Macaulayness of relative equivariant cohomology modules arising from the orbit filtration.
description: 28 pages. This is a substantially expanded version of Section 6 of arXiv:1111.0957v1. v2: new result (Prop. 2.7) about equivariant homology in the case of freely acting subgroups; minor changes. v3: mistake in the proof of Prop. 2.7 corrected
Moxetumomab Pasudotox in Hairy Cell Leukaemia: A Profile of Its Use
Creators: name: Kang, Connie
Publisher: name: Adis Journals
Year: 2021
Subjects: Medicine
Cancer

description: Declarations Funding The preparation of this review was not supported by any external funding. Authorship and Conflict of interest Connie Kang is a salaried employee of Adis International Ltd/Springer Nature, and declares no relevant conflicts of interest. All authors contributed to the review and are responsible for the article content. Ethics approval, Consent to participate, Consent to publish, Availability of data and material, Code availability Not applicable.
Additional information about this Adis Drug Review can be found here.

AbstractMoxetumomab pasudotox (Lumoxiti®), an anti-CD22 recombinant immunotoxin, is an important treatment option that is approved in adults with relapsed or refractory hairy cell leukaemia (HCL) who have received at least two prior lines of treatment with systemic therapies including purine nucleoside analogues. In a pivotal phase III trial, treatment with moxetumomab pasudotox resulted in approximately one third of patients achieving durable complete response lasting more than 6 months, as well as improvements in other haematological parameters and disease-related symptoms. Moxetumomab pasudotox had a generally manageable tolerability profile; the most common treatment-related adverse events (AEs) included nausea, peripheral oedema, headache and pyrexia. AEs of special interest (including haemolytic uraemic syndrome and capillary leak syndrome) were generally manageable and reversible with monitoring and supportive care.© Springer Nature Switzerland AG 2021
Phospholipid synthesis rates in the eastern subtropical South Pacific Ocean
Creators: name: Van Mooy, B. A. S.
name: Moutin, Thierry
name: Duhamel, Solange
name: Rimmelin, P.
name: Van Wambeke, France
Publisher: name: Columbia University
Year: 2008
Subjects: Biogeochemistry
Marine microbiology
Marine plankton
Phospholipids
Phospholipids--Synthesis
Heterotrophic bacteria
Phosphorus cycle (Biogeochemistry)

description: Membrane lipid molecules are a major component of planktonic organisms and this is particularly true of the microbial picoplankton that dominate the open ocean; with their high surface-area to volume ratios, the synthesis of membrane lipids places a major demand on their overall cell metabolism. Specifically, the synthesis of cell membrane phospholipids creates a demand for the nutrient phosphorus, and we sought to refine our understanding of the role of phospholipids in the upper ocean phosphorus cycle. We measured the rates of phospholipid synthesis in a transect of the eastern subtropical South Pacific from Easter Island to Concepcion, Chile as part of the BIOSOPE program. Our approach combined standard phosphorus radiotracer incubations and lipid extraction methods. We found that phospholipid synthesis rates varied from less than 1 to greater than 200 pmol P L−1 h−1, and that phospholipid synthesis contributed between less than 5% to greater than 22% of the total PO43− incorporation rate. Changes in the percentage that phospholipid synthesis contributed to total PO43− uptake were strongly correlated with the ratio of primary production to bacterial production, which supported our hypothesis that heterotrophic bacteria were the primary agents of phospholipid synthesis. The spatial variation in phospholipid synthesis rates underscored the importance of heterotrophic bacteria in the phosphorus cycle of the eastern subtropical South Pacific, particularly the hyperoligotrophic South Pacific subtropical gyre.
Tomography of Feshbach Resonance States
Creators: name: Margulis, Baruch
name: Horn, Karl P.
name: Reich, Daniel M.
name: Upadhyay, Meenu
name: Kahn, Nitzan
name: Christianen, Arthur
name: van der Avoird, Ad
name: Groenenboom, Gerrit C.
name: Meuwly, Markus
name: Koch, Christiane P.
name: Narevicius, Edvardas
Publisher: name: arXiv
Year: 2022
Subjects: subject: Atomic Physics (physics.atom-ph)
subject: Chemical Physics (physics.chem-ph)
subject: FOS: Physical sciences

description: Feshbach resonances are fundamental to interparticle interactions and become particularly important in cold collisions with atoms, ions, and molecules. Here we present the detection of Feshbach resonances in a benchmark system for strongly interacting and highly anisotropic collisions -- molecular hydrogen ions colliding with noble gas atoms. The collisions are launched by cold Penning ionization exclusively populating Feshbach resonances that span both short- and long-range parts of the interaction potential. We resolved all final molecular channels in a tomographic manner using ion-electron coincidence detection. We demonstrate the non-statistical nature of the final state distribution. By performing quantum scattering calculations on ab initio potential energy surfaces, we show that the isolation of the Feshbach resonance pathways reveals their distinctive fingerprints in the collision outcome.
Dissipation enhancement from a single vortex reconnection in superfluid helium
Creators: name: Hänninen, R.
Publisher: name: arXiv
Year: 2013
Subjects: subject: Other Condensed Matter (cond-mat.other)
subject: Fluid Dynamics (physics.flu-dyn)
subject: FOS: Physical sciences

description: We investigate a single vortex reconnection event in superfluid helium at finite temperatures using the vortex filament model. The reconnection induces Kelvin waves which strongly increase energy dissipation. We evaluate the mutual friction dissipation from the reconnection and show that the dissipation power has universal form, which is seen by scaling both time (measured from the reconnection event) and power by the mutual friction parameter alpha. This observation allows us to conclude that the Kelvin-wave cascade is not important in the energy dissipation process within the range alpha > 0.001. Rather, the energy is directly transferred from Kelvin waves to the normal component. Moreover, while the excited Kelvin waves greatly enhance energy dissipation, no similar change is seen in angular momentum from the reconnection event. This result has similarities with recent 3He-B measurements. Our results also confirm another earlier observation that the minimum distance between vortices scales approximately as d ~ sqrt(|t-trec|), both before and after the reconnection event.
description: 8 pages, 6 figures; v2: moderate changes; v3: minor changes
On extension to Fourier transforms
Creators: name: Lebedev, Vladimir
Publisher: name: arXiv
Year: 2021
Subjects: subject: Functional Analysis (math.FA)
subject: Classical Analysis and ODEs (math.CA)
subject: FOS: Mathematics
subject: Primary 43A20, 43A25, 43A46, 47B38

description: For $n$-point sets $K$ in an LCA group $Γ$ we obtain an estimate for the norm of "the best" extension operator from the space $l^\infty(K)$ of bounded functions on $K$ to the space $A(Γ)$ of Fourier transforms. As a simple consequence our estimate implies that if $K$ is an infinite closed subset of $Γ$ then there does not exist a bounded linear extension operator from the space $C_0(K)$ of continuous functions on $K$ vanishing at infinity to $A(Γ)$. The latter result generalizes a result by Graham who considered the case of compact subsets $K$.
description: Minor typos corrected
2-limited broadcast domination on grid graphs
Creators: name: Slobodin, Aaron
name: MacGillivray, Gary
name: Myrvold, Wendy
Publisher: name: arXiv
Year: 2021
Subjects: subject: Combinatorics (math.CO)
subject: FOS: Mathematics

description: We establish upper and lower bounds for the 2-limited broadcast domination number of various grid graphs, in particular the Cartesian product of two paths, a path and a cycle, and two cycles. The upper bounds are derived by explicit constructions. The lower bounds are obtained via linear programming duality by finding lower bounds for the fractional 2-limited multipacking numbers of these graphs.
title: Ποιοτική αναβάθμιση λιγνιτικού ενδιάμεσου από το ορυχείο Κομάνου με τη μέθοδο εμπλουτισμού της εκλεκτικής ελάττωσης μεγέθους
Creators: name: Γκουτζαμάνη Φωτεινή
Publisher: name: Technical University of Crete
Year: 1994

description: Μη διαθέσιμο
Generation of primordial black holes from an inflation model with modified dispersion relation
Creators: name: Qiu, Taotao
name: Wang, Wenyi
name: Zheng, Ruifeng
Publisher: name: arXiv
Year: 2022
Subjects: subject: Cosmology and Nongalactic Astrophysics (astro-ph.CO)
subject: General Relativity and Quantum Cosmology (gr-qc)
subject: High Energy Physics - Phenomenology (hep-ph)
subject: High Energy Physics - Theory (hep-th)
subject: FOS: Physical sciences

description: A primordial black hole (PBH) is interesting to people for its ability of explaining dark matter as well as supermassive astrophysical objects. In the normal inflation scenario, the generation of PBHs usually requires an enhanced power spectrum of scalar perturbation at the end of inflation era, which is expected when the dispersion relation of the inflaton field gets modified. In this work, we study a kind of inflation model called {the \it Dirac-Born-Infeld-inspired nonminimal kinetic coupling (DINKIC)} model, where the dispersion relation is modified by a square root existing in the field Lagrangian. We discuss the enhancement of scalar power spectrum due to the modified dispersion relation, as well as the abundance of PBHs produced by the Press-Schechter collapse mechanism. We also discuss the formation of scalar-induced gravitational waves by linear scalar perturbations.
description: 13 pages, 5 figures
title: Επεξεργασία εργαστηριακών μετρήσεων PVT με χρήση ηλεκτρονικού υπολογιστή
Creators: name: Μπαλτογιάννης Νικόλαος
Publisher: name: Technical University of Crete
Year: 1994

description: Μη διαθέσιμο
Strongly light subgraphs in the 1-planar graphs with minimum degree 7
Creators: name: Wang, Tao
Publisher: name: arXiv
Year: 2013
Subjects: subject: Combinatorics (math.CO)
subject: Discrete Mathematics (cs.DM)
subject: FOS: Mathematics
subject: FOS: Computer and information sciences
subject: 05C10

description: A graph is {\em $1$-planar} if it can be drawn in the plane such that every edge crosses at most one other edge. A connected graph $H$ is {\em strongly light} in a family of graphs $\mathfrak{G}$, if there exists a constant $λ$, such that every graph $G$ in $\mathfrak{G}$ contains a subgraph $K$ isomorphic to $H$ with $°_{G}(v) \leq λ$ for all $v \in V(K)$. In this paper, we present some strongly light subgraphs in the family of $1$-planar graphs with minimum degree~$7$.
description: 6 pages, 6 figures, http://amc-journal.eu/index.php/amc/article/view/564. in Ars Mathematica Contemporanea, 2015
title: Μελέτη φυσικοχημικών ιδιοτήτων μεσαιωνικών και παραδοσιακών κονιαμάτων και των πρώτων υλών κατασκευής τους
Creators: name: Μωχάμεντ Μωχάμεντ
Publisher: name: Technical University of Crete
Year: 1994

description: Μη διαθέσιμο
title: Εφαρμογή της σεισμικής τομογραφίας σε εκμεταλλεύσεις κοιτασμάτων μαρμάρου
Creators: name: Μοσχόβης Ερμόλαος
Publisher: name: Technical University of Crete
Year: 1994

description: Μη διαθέσιμο
Tight bounds on the maximal area of small polygons: Improved Mossinghoff polygons
Creators: name: Bingane, Christian
Publisher: name: arXiv
Year: 2021
Subjects: subject: Combinatorics (math.CO)
subject: Metric Geometry (math.MG)
subject: FOS: Mathematics
subject: 52A40, 52A10, 52B55

description: A small polygon is a polygon of unit diameter. The maximal area of a small polygon with $n=2m$ vertices is not known when $m \ge 7$. In this paper, we construct, for each $n=2m$ and $m\ge 3$, a small $n$-gon whose area is the maximal value of a one-variable function. We show that, for all even $n\ge 6$, the area obtained improves by $O(1/n^5)$ that of the best prior small $n$-gon constructed by Mossinghoff. In particular, for $n=6$, the small $6$-gon constructed has maximal area.
description: arXiv admin note: text overlap with arXiv:2009.07893
Anthropogenic influence on the fate of secondary organic aerosol : chlorine chemistry and alkane oxidation
Creators: name: Wang, Dongyu
name: 0000-0001-7549-1578
Publisher: name: The University of Texas at Austin
Year: 2022
Subjects: Atmospheric chemistry
Mass spectrometry

description: Oxidation of volatile organic compounds (VOC) in the atmosphere leads to the formation of secondary organic aerosol (SOA), which can have extensive impacts on air quality, health, and climate. Existing air quality models used to describe the fate of ambient organic aerosol tend to underpredict the aerosol oxidation state. In addition, modeled concentrations of nitrogen oxides (NO [subscript x]) and other reactive nitrogen compounds (NO [subscript y]), including alkyl nitrates, often deviate from field observations. Certain SOA formation pathways, SOA ageing mechanisms, and alkyl nitrate decay mechanisms may be missing. Recent field studies show that NO [subscript x]-mediated heterogeneous production of nitryl chloride, ClNO₂, could provide a ubiquitous source for chlorine atoms. Little is known about the role of chlorine atoms in SOA formation and ageing, or their interaction with other anthropogenic emissions found in polluted environments, where alkane oxidation chemistry is important. Environmental chamber experiments are carried out to address knowledge gaps in atmospheric chlorine and alkane oxidation chemistry. Results show that chlorine-initiated oxidation of isoprene leads to SOA formation, organic chloride formation, and possibly secondary HO [subscript x] chemistry. Alkane-derived alkyl nitrate compounds are found not to hydrolyze appreciably in humid environments or in the presence of acidic aerosol. Uptake of inorganic nitrate and inorganic chloride are observed in the presence of deliquescent particles. Chlorine-initiated oxidation of linear alkanes is shown to result in prompt SOA formation and delayed organic chloride formation, which is enabled by the addition of chlorine radical to dihydrofuran, a heterogeneously produced multi-generational oxidation product. Improvements are made for the detection of organic chloride using aerosol mass spectrometry, and for aerosol volatility measurements using temperature programmed thermal desorption techniques. A two-dimensional thermogram framework is developed to visualize aerosol composition, aerosol volatility, and thermal fragmentation simultaneously.
On the diameter of total domination vertex critical graphs
Creators: name: Wang, Tao
Publisher: name: arXiv
Year: 2013
Subjects: subject: Combinatorics (math.CO)
subject: Discrete Mathematics (cs.DM)
subject: FOS: Mathematics
subject: FOS: Computer and information sciences
subject: 05C12, 05C69

description: In this paper, we consider various types of domination vertex critical graphs, including total domination vertex critical graphs, independent domination vertex critical graphs and connected domination vertex critical graphs. We provide upper bounds on the diameter of them, two of which are sharp.
description: 8 pages in Bulletin of the Malaysian Mathematical Sciences Society, 2015
Moduli space of supersymmetric QCD in the Veneziano limit
Creators: name: Chen, Yang
name: Jokela, Niko
name: Jarvinen, Matti
name: Mekareeya, Noppadol
Publisher: name: arXiv
Year: 2013
Subjects: subject: High Energy Physics - Theory (hep-th)
subject: FOS: Physical sciences

description: We study the moduli space of 4d N=1 supersymmetric QCD in the Veneziano limit using Hilbert series. In this limit, the numbers of colours and flavours are taken to be large with their ratio fixed. It is shown that the Hilbert series, which is a partition function of an ensemble of gauge invariant quantities parametrising the moduli space, can also be realised as a partition function of a system of interacting Coulomb gas in two dimensions. In the electrostatic equilibrium, exact and asymptotic analyses reveal that such a system exhibits two possible phases. Physical quantities, such as charge densities, free energies, and Hilbert series, associated with each phase, are computed explicitly and discussed in detail. We then demonstrate the existence of the third order phase transition in this system.
description: 38 pages; v2: clarifications added, published version
Steady entanglement out of thermal equilibrium
Creators: name: Bellomo, Bruno
name: Antezza, Mauro
Publisher: name: arXiv
Year: 2013
Subjects: subject: Quantum Physics (quant-ph)
subject: FOS: Physical sciences

description: We study two two-level atomic quantum systems (qubits) placed close to a body held at a temperature different from that of the surrounding walls. While at thermal equilibrium the two-qubit dynamics is characterized by not entangled steady thermal states, we show that absence of thermal equilibrium may bring to the generation of entangled steady states. Remarkably, this entanglement emerges from the two-qubit dissipative dynamic itself, without any further external action on the two qubits, suggesting a new protocol to produce and protect entanglement which is intrinsically robust to environmental effects.
description: 6 pages, 4 figures, some typos corrected with respect to both the previous arXiv and published versions
Tracing the kinematics of the whole ram pressure stripped tails in ESO 137-001
Creators: name: Luo, Rongxin
name: Sun, Ming
name: Jáchym, Pavel
name: Waldron, Will
name: Fossati, Matteo
name: Fumagalli, Michele
name: Boselli, Alessandro
name: Combes, Francoise
name: Kenney, Jeffrey D. P.
name: Li, Yuan
name: Gronke, Max
Publisher: name: arXiv
Year: 2022
Subjects: subject: Astrophysics of Galaxies (astro-ph.GA)
subject: FOS: Physical sciences

description: Ram pressure stripping (RPS) is an important process to affect the evolution of cluster galaxies and their surrounding environment. We present a large MUSE mosaic for ESO 137-001 and its stripped tails, and study the detailed distributions and kinematics of the ionized gas and stars. The warm, ionized gas is detected to at least 87 kpc from the galaxy and splits into three tails. There is a clear velocity gradient roughly perpendicular to the stripping direction, which decreases along the tails and disappears beyond $\sim45$ kpc downstream. The velocity dispersion of the ionized gas increases to $\sim80$ km s$^{-1}$ at $\sim20$ kpc downstream and stays flat beyond. The stars in the galaxy disc present a regular rotation motion, while the ionized gas is already disturbed by the ram pressure. Based on the observed velocity gradient, we construct the velocity model for the residual galactic rotation in the tails and discuss the origin and implication of its fading with distance. By comparing with theoretical studies, we interpreted the increased velocity dispersion as the result of the oscillations induced by the gas flows in the galaxy wake, which may imply an enhanced degree of turbulence there. We also compare the kinematic properties of the ionized gas and molecular gas from ALMA, which shows they are co-moving and kinematically mixed through the tails. Our study demonstrates the great potential of spatially resolved spectroscopy in probing the detailed kinematic properties of the stripped gas, which can provide important information for future simulations of RPS.
description: 18 pages, 20 figures, 2 tables, accepted for publication in MNRAS
Transformation and Upwelling of Bottom Water in Fracture Zone Valleys
Creators: name: Thurnherr, Andreas M.
name: Clément, Louis
name: St. Laurent, Louis C.
name: Ferrari, Raffaele
name: Ijichi, Takashi
Publisher: name: Columbia University
Year: 2020
Subjects: subject: Oceanography
subject: FOS: Earth and related environmental sciences
subject: Ocean circulation
subject: Upwelling (Oceanography)
subject: Bottom water (Oceanography)
subject: Turbulence
subject: Submarine topography

description: Closing the overturning circulation of bottom water requires abyssal transformation to lighter densities and upwelling. Where and how buoyancy is gained and water is transported upward remain topics of debate, not least because the available observations generally show downward-increasing turbulence levels in the abyss, apparently implying mean vertical turbulent buoyancy-flux divergence (densification). Here, we synthesize available observations indicating that bottom water is made less dense and upwelled in fracture zone valleys on the flanks of slow-spreading midocean ridges, which cover more than one-half of the seafloor area in some regions. The fracture zones are filled almost completely with water flowing up-valley and gaining buoyancy. Locally, valley water is transformed to lighter densities both in thin boundary layers that are in contact with the seafloor, where the buoyancy flux must vanish to match the no-flux boundary condition, and in thicker layers associated with downward-decreasing turbulence levels below interior maxima associated with hydraulic overflows and critical-layer interactions. Integrated across the valley, the turbulent buoyancy fluxes show maxima near the sidewall crests, consistent with net convergence below, with little sensitivity of this pattern to the vertical structure of the turbulence profiles, which implies that buoyancy flux convergence in the layers with downward-decreasing turbulence levels dominates over the divergence elsewhere, accounting for the net transformation to lighter densities in fracture zone valleys. We conclude that fracture zone topography likely exerts a controlling influence on the transformation and upwelling of bottom water in many areas of the global ocean.
Constraint analysis for variational discrete systems
Creators: name: Dittrich, Bianca
name: Hoehn, Philipp A
Publisher: name: arXiv
Year: 2013
Subjects: subject: Mathematical Physics (math-ph)
subject: General Relativity and Quantum Cosmology (gr-qc)
subject: High Energy Physics - Lattice (hep-lat)
subject: FOS: Physical sciences

description: A canonical formalism and constraint analysis for discrete systems subject to a variational action principle are devised. The formalism is equivalent to the covariant formulation, encompasses global and local discrete time evolution moves and naturally incorporates both constant and evolving phase spaces, the latter of which is necessary for a time varying discretization. The different roles of constraints in the discrete and the conditions under which they are first or second class and/or symmetry generators are clarified. The (non-) preservation of constraints and the symplectic structure is discussed; on evolving phase spaces the number of constraints at a fixed time step depends on the initial and final time step of evolution. Moreover, the definition of observables and a reduced phase space is provided; again, on evolving phase spaces the notion of an observable as a propagating degree of freedom requires specification of an initial and final step and crucially depends on this choice, in contrast to the continuum. However, upon restriction to translation invariant systems, one regains the usual time step independence of canonical concepts. This analysis applies, e.g., to discrete mechanics, lattice field theory, quantum gravity models and numerical analysis.
description: 49 pages, many figures, typos corrected, clarification concerning consistency of discrete evolution from initial value problem added, matches published version
Resonant Majorana neutrino effects in $Δ$L=2 four-body hyperon decays
Creators: name: Hernández-Tomé, Gerardo
name: Portillo-Sánchez, Diego
name: Toledo, Genaro
Publisher: name: arXiv
Year: 2022
Subjects: subject: High Energy Physics - Phenomenology (hep-ph)
subject: FOS: Physical sciences

description: We computed the $Σ^{-}\to nπ^+e^-\ell^-$ ($\ell=e,μ$), $Ξ^-\to Λπ^+e^-e^-$, and $Λ\to pπ^+e^-e^-$ lepton number violating (LNV) hyperon decays mediated by a resonant Majorana neutrino. The expected hyperon production rate of experiments like BES-III of around $10^6-10^8$ may allow searching for these rare hyperon decays at enough sensitivities. We illustrate the limits on the new heavy mixing parameters derived from these hyperon channels and compare them with other LNV meson decays in similar mass regions of the resonant neutrino state.
description: 18 pages, 3 figures
How to engineer a quantum wavefunction
Creators: name: Evans, Peter W.
name: Hangleiter, Dominik
name: Thébault, Karim P. Y.
Publisher: name: arXiv
Year: 2021
Subjects: subject: Quantum Physics (quant-ph)
subject: FOS: Physical sciences

description: In a conventional experiment, scientists typically aim to learn about target systems by manipulating source systems of the same material type. In an analogue quantum simulation, by contrast, scientists typically aim to learn about target quantum systems of one material type via an experiment on a source quantum system of a different material type. In this paper, we argue that such inferences can be justified by reference to source and target quantum systems being of the same empirical type. We illustrate this novel experimental practice of wavefunction engineering with reference to the example of Bose-Hubbard systems.
title: Λειτουργική και κοστολογική ανάλυση των συστημάτων συνεχούς και ασυνεχούς λειτουργίας του ορυχείου Νοτίου Πεδίου
Creators: name: Μανιδάκη Αικατερίνη
Publisher: name: Technical University of Crete
Year: 1993

description: Μη διαθέσιμο
Semiconcave functions in Alexandrov's geometry
Creators: name: Petrunin, Anton
Publisher: name: arXiv
Year: 2013
Subjects: subject: Differential Geometry (math.DG)
subject: FOS: Mathematics
subject: 53C21 (53C20 53C45 58E05)

description: The following is a compilation of some techniques in Alexandrov's geometry which are directly connected to convexity.
description: Minor updates in the old paper
Die ältesten Plastiken der Menschheit in 3-D. Kombination von 3-D-Streifenlichtscan und -Fotogrammetrie zur Dokumentation und Visualisierung von Funden
Creators: name: Steffen, Markus
name: Steffen, Christoph
Publisher: name: Denkmalpflege in Baden-Württemberg – Nachrichtenblatt der Landesdenkmalpflege
Year: 2017

description: Denkmalpflege in Baden-Württemberg – Nachrichtenblatt der Landesdenkmalpflege, Bd. 46, Nr. 1 (2017)
title: Παρασκευή πυρίμαχων πυρότουβλων από εμπλουτισμένους βωξίτες Παρνασσού και καολινικά απορρίματα Μήλου
Creators: name: Φουντούλη Βασιλική
Publisher: name: Technical University of Crete
Year: 1994

description: Μη διαθέσιμο
A Simple Method for One-Loop Renormalization in Curved Space-Time
Creators: name: Markkanen, Tommi
name: Tranberg, Anders
Publisher: name: arXiv
Year: 2013
Subjects: subject: High Energy Physics - Theory (hep-th)
subject: General Relativity and Quantum Cosmology (gr-qc)
subject: High Energy Physics - Phenomenology (hep-ph)
subject: FOS: Physical sciences

description: We present a simple method for deriving the renormalization counterterms from the components of the energy-momentum tensor in curved space-time. This method allows full control over the finite parts of the counterterms and provides explicit expressions for each term separately. As an example, the method is used for the self-interacting scalar field in a Friedmann-Robertson-Walker metric in the adiabatic approximation, where we calculate the renormalized equation of motion for the field and the renormalized components of the energy-momentum tensor to fourth adiabatic order while including interactions to one-loop order. Within this formalism the trace anomaly, including contributions from interactions, is shown to have a simple derivation. We compare our results to those obtained by two standard methods, finding agreement with the Schwinger-DeWitt expansion but disagreement with adiabatic subtractions for interacting theories.
description: 25 pages, published version
Hybrid Self-Attention NEAT: A novel evolutionary approach to improve the NEAT algorithm
Creators: name: Khamesian, Saman
name: Malek, Hamed
Publisher: name: arXiv
Year: 2021
Subjects: subject: Neural and Evolutionary Computing (cs.NE)
subject: Artificial Intelligence (cs.AI)
subject: FOS: Computer and information sciences

description: This article presents a "Hybrid Self-Attention NEAT" method to improve the original NeuroEvolution of Augmenting Topologies (NEAT) algorithm in high-dimensional inputs. Although the NEAT algorithm has shown a significant result in different challenging tasks, as input representations are high dimensional, it cannot create a well-tuned network. Our study addresses this limitation by using self-attention as an indirect encoding method to select the most important parts of the input. In addition, we improve its overall performance with the help of a hybrid method to evolve the final network weights. The main conclusion is that Hybrid Self- Attention NEAT can eliminate the restriction of the original NEAT. The results indicate that in comparison with evolutionary algorithms, our model can get comparable scores in Atari games with raw pixels input with a much lower number of parameters.
Fine art ceramics: mathematics & art.
Creators: name: Eduardii, Aurelia
Publisher: name: figshare
Year: 2021
Subjects: subject: 190103 Art Theory
subject: FOS: Arts (arts, history of arts, performing arts, music)
subject: 190102 Art History
subject: 190502 Fine Arts (incl. Sculpture and Painting)
subject: 190104 Visual Cultures
subject: Crystallography
subject: 30307 Theory and Design of Materials
subject: FOS: Chemical sciences

description: Mathematics and art as expressed by ceramics.
Factorization for Azimuthal Asymmetries in SIDIS at Next-to-Leading Power
Creators: name: Ebert, Markus A.
name: Gao, Anjie
name: Stewart, Iain W.
Publisher: name: arXiv
Year: 2021
Subjects: subject: High Energy Physics - Phenomenology (hep-ph)
subject: Nuclear Theory (nucl-th)
subject: FOS: Physical sciences

description: Differential measurements of the semi-inclusive deep inelastic scattering (SIDIS) process with polarized beams provide important information on the three-dimensional structure of hadrons. Among the various observables are azimuthal asymmetries that start at subleading power, and which give access to novel transverse momentum dependent distributions (TMDs). Theoretical predictions for these distributions are currently based on the parton model rather than a rigorous factorization based analysis. Working under the assumption that leading power Glauber interactions do not spoil factorization at this order, we use the Soft Collinear Effective Theory to derive a complete factorization formula for power suppressed hard scattering effects in SIDIS. This yields generalized definitions of the TMDs that depend on two longitudinal momentum fractions (one of them only relevant beyond tree level), and a complete proof that only the same leading power soft function appears and can be absorbed into the TMD distributions at this order. We also show that perturbative corrections can be accounted for with only one new hard coefficient. Factorization formulae are given for all spin dependent structure functions which start at next-to-leading power. Prospects for improved subleading power predictions that include resummation are discussed.
description: 118 pages, 1 figure; Update fixing typos and with complex C^(1) [JHEP erratum version]
Heterotrophic bacterial production in the eastern South Pacific: longitudinal trends and coupling with primary production
Creators: name: Van Wambeke, France
name: Obernosterer, I.
name: Moutin, Thierry
name: Duhamel, Solange
name: Ulloa, O.
name: Claustre, H.
Publisher: name: Columbia University
Year: 2008
Subjects: Biogeochemistry
Marine microbiology
Heterotrophic bacteria

description: Spatial variation of heterotrophic bacterial production and phytoplankton primary production were investigated across the eastern South Pacific Ocean (−141° W, −8° S to −72° W, −35° S) in November–December 2004. Bacterial production (³H leucine incorporation) integrated over the euphotic zone encompassed a wide range of values, from 43 mg C m⁻² d⁻¹ in the hyper-oligotrophic South Pacific Gyre to 392 mg C m⁻² d⁻¹ in the upwelling off Chile. In the gyre (120° W, 22° S) records of low phytoplankton biomass (7 mg Total Chla m⁻²) were obtained and fluxes of in situ 14C-based particulate primary production were as low as 153 mg C m⁻² d⁻¹, thus equal to the value considered as a limit for primary production under strong oligotrophic conditions. Average rates of ³H leucine incorporation rates, and leucine incorporation rates per cell (5–21 pmol l⁻¹ h⁻¹ and 15–56×10⁻²¹ mol cell⁻¹ h⁻¹, respectively) determined in the South Pacific gyre, were in the same range as those reported for other oligotrophic subtropical and temperate waters. Fluxes of dark community respiration, determined at selected stations across the transect varied in a narrow range (42–97 mmol O2 m⁻² d⁻¹), except for one station in the upwelling off Chile (245 mmol O2 m⁻² d⁻¹). Bacterial growth efficiencies varied between 5 and 38%. Bacterial carbon demand largely exceeded 14C particulate primary production across the South Pacific Ocean, but was lower or equal to gross community production.
The epsilon expansion of the O$(N)$ model with line defect from conformal field theory
Creators: name: Nishioka, Tatsuma
name: Okuyama, Yoshitaka
name: Shimamori, Soichiro
Publisher: name: arXiv
Year: 2022
Subjects: subject: High Energy Physics - Theory (hep-th)
subject: Statistical Mechanics (cond-mat.stat-mech)
subject: Strongly Correlated Electrons (cond-mat.str-el)
subject: FOS: Physical sciences

description: We employ the axiomatic framework of Rychkov and Tan to investigate the critical O$(N)$ vector model with a line defect in $(4-ε)$ dimensions. We assume the fixed point is described by defect conformal field theory and show that the critical value of the defect coupling to the bulk field is uniquely fixed without resorting to diagrammatic calculations. We also study various defect localized operators by the axiomatic method, where the analyticity of correlation functions plays a crucial role in determining the conformal dimensions of defect composite operators. In all cases, including operators with operator mixing, we reproduce the leading anomalous dimensions obtained by perturbative calculations.
description: 29 pages, 2 figures, v2; typos corrected
Magnetic properties of pressurized CsV$_{3}$Sb$_{5}$ calculated by using a hybrid functional
Creators: name: Wu, Wenfeng
name: Wang, Xianlong
name: Zeng, Zhi
Publisher: name: arXiv
Year: 2021
Subjects: subject: Strongly Correlated Electrons (cond-mat.str-el)
subject: FOS: Physical sciences

description: Based on the hybrid functional, we find that at 0 GPa, the pristine CsV$_{3}$Sb$_{5}$ has local magnetic moment of 0.85 $μ_B$ /unit cell, which is suppressed at pressure of 2.5 GPa resulting in a spin-crossover. Since the ground sate of CsV$_{3}$Sb$_{5}$ with charge density wave (CDW) distortion is non-magnetic state, the local magnetic moment of pristine CsV$_{3}$Sb$_{5}$ will be suppressed by temperature-induced CDW transition at 94 K. The schematic evolution of magnetic moments as functions of pressure and temperature are presented. At low temperature, CsV$_{3}$Sb$_{5}$ is a rare example of materials hosting pressureinduced local magnetic moment, and we suggeste that the effects of local magnetic moments should be considered for understanding its properties.
Alkaline phosphatase activity of marine bacteria studied with ELF 97 substrate: success and limits in the P-limited Mediterranean Sea
Creators: name: Van Wambeke, France
name: Nedoma, Jiří
name: Duhamel, Solange
name: Lebaron, Philippe
Publisher: name: Columbia University
Year: 2008
Subjects: Biogeochemistry
Marine microbiology
Marine bacteria
Alkaline phosphatase

description: The fluorogenic substrate Enzyme-Labeled Fluorescence 97 (ELF-P) is hydrolyzed by the P-cleaving enzyme phosphatase, producing ELF 97 alcohol (ELFA), a fluorescent-insoluble product. This reaction is used for monitoring phosphatase activity at the single-cell level. Most frequently, ELF-P has been used to determine the P-limitation status of microphytoplankton, but rarely of heterotrophic bacteria. We incubated ELF-P on filters to monitor marine bacterial cultures and oligotrophic Mediterranean Sea samples. Results were compared to classical measurements of bulk alkaline phosphatase activity using the fluorogenic substrate 4-methylumbelliferyl phosphate (MUF-P). A high percentage of the cultured cells were labeled with ELFA (the ratio of ELFA spots to total DAPI counts in P-limited cultures ranged from 26 to 100%, depending on the strain). In contrast, this ratio never exceeded 0.01% in Mediterranean samples, even when P was demonstrated to be a significant limiting factor. This protocol is useful for application on cruises and with cultures, but was not sufficiently sensitive to detect P-stressed bacterial cells in oligotrophic marine environments.
Approximating the Prime Counting Function via an Operation on a Unique Prime Number Subsequence
Creators: name: May, Michael P.
Publisher: name: arXiv
Year: 2021
Subjects: subject: General Mathematics (math.GM)
subject: FOS: Mathematics
subject: 11A41, 11B05, 11K31

description: We reveal a relationship between the prime counting function and an operation performed on a unique subsequence of the primes.
description: 10 pages, 1 figure, 1 table. Missouri Journal of Mathematical Sciences May 2023
Detection of Extracellular Phosphatase Activity of Heterotrophic Prokaryotes at the Single‐Cell Level by Flow Cytometry
Creators: name: Duhamel, Solange
name: Gregori, Gerald
name: Van Wambeke, France
name: Nedoma, Jiří
Publisher: name: Columbia University
Year: 2009
Subjects: Biogeochemistry
Heterotrophic bacteria
Phosphatases
Flow cytometry

description: Monitoring cell activity using substrates, which turn fluorescent due to biological activity, allows observing the presence and dynamics of sub‐populations, and provides a very valuable insight in ecological studies. The phosphatase substrate ELF97 phosphate (ELF‐P) is a useful tool to detect and quantify phosphatase activity (PA) of microorganisms at the single‐cell level. Most of the studies dealing with PA at the single‐cell level focus on autotrophic cells and only few concern heterotrophic prokaryotes (referred as bacteria in the text). While flow cytometry is a promising tool to assess the single‐cell analysis, only microscopy tools have been used until now to measure the ELF labeling associated with bacteria expressing PA. Therefore, we have developed a new protocol that enables the detection of ELF alcohol (ELFA), the product of ELF‐P hydrolysis, making possible the specific identification of bacteria showing PA using flow cytometry.
title: Παραγωγή ρευστών υδρογοναθράκων από διαχωριστήρα σε συνθήκες τανκ. Ανάλυση παραμέτρων που επηρεάζουν τη μεταβολή των όγκων των
Creators: name: Αγριτέλη Ταξιαρχούλα
Publisher: name: Technical University of Crete
Year: 1993

description: Μη διαθέσιμο
The landscape of two-proton radioactivity
Creators: name: Olsen, E.
name: Pfützner, M.
name: Birge, N.
name: Brown, M.
name: Nazarewicz, W.
name: Perhac, A.
Publisher: name: arXiv
Year: 2013
Subjects: subject: Nuclear Theory (nucl-th)
subject: Nuclear Experiment (nucl-ex)
subject: FOS: Physical sciences

description: Ground-state two-proton (2p) radioactivity is a decay mode found in isotopes of elements with even atomic numbers located beyond the two-proton drip line. So far, this exotic process has been experimentally observed in a few light and medium-mass nuclides with Z less than or equal to 30. In this study, using state-of-the-art nuclear density functional theory, we globally analyze 2p radioactivity and for the first time identify 2p decay candidates in elements heavier than strontium. We predict a few cases where the competition between 2p emission and alpha decay may be observed. In nuclei above lead, the alpha decay mode is found to be dominating and no measurable candidates for the 2p radioactivity are expected.
description: 1 page, 2 encapsulated-postscript figures; this work has been accepted for publication in Physical Review Letters
Cities as nuclei of sustainability?
Creators: name: Rybski, Diego
name: Reusser, Dominik E.
name: Winz, Anna-Lena
name: Fichtner, Christina
name: Sterzel, Till
name: Kropp, Jürgen P.
Publisher: name: arXiv
Year: 2013
Subjects: subject: Physics and Society (physics.soc-ph)
subject: Atmospheric and Oceanic Physics (physics.ao-ph)
subject: Data Analysis, Statistics and Probability (physics.data-an)
subject: FOS: Physical sciences

description: We have assembled CO2 emission figures from collections of urban GHG emission estimates published in peer reviewed journals or reports from research institutes and non-governmental organizations. Analyzing the scaling with population size we find that the exponent is development dependent with a transition from super- to sub-linear scaling. From the climate change mitigation point of view, the results suggest that urbanization is desirable in developed countries and should be avoided in developing ones. Further, we compare this analysis with a second scaling relation, namely the fundamental allometry between city population and area, and propose that density might be the decisive quantity. Last, we derive the theoretical country-wide urban emissions by integration and obtain a dependence on the size of the largest city.
description: 9 pages, 6 figures