cometadata/datacite-rtg-text-other-reclassification-records huggingface dataset:
title: Ubykh2, listeXXIV
Creators: name: Michailovsky, Boyd
name: Dumézil, Georges
Publisher: name: COCOON - https://cocoon.huma-num.fr (Huma-Num - CNRS)
publisherIdentifier: https://ror.org/04ces3204
publisherIdentifierScheme: ROR
Year: 2011
Subjects: subject: Ubykh
subject: uby

description: Conforms to: doi:10.34847/cocoon.49aefa90-8c1f-3ba8-a099-0ebefc6a2aa7
NN Correlations and Relativistic Hartree Fock in Finite Nuclei
Creators: name: Fritz, R.
name: Müther, H.
Publisher: name: arXiv
Year: 1993
Subjects: subject: Nuclear Theory (nucl-th)
subject: FOS: Physical sciences

description: Two different approximation schemes for the self-consistent solution of the relativistic Brueckner-Hartree-Fock equation for finite nuclei are discussed using realistic One-Boson-Exchange potentials. In a first scheme, the effects of correlations are deduced from a study of nuclear matter and parameterized in terms of an effective $σ$, $ω$ and $π$ exchange. Employing this effective interaction relativistic Hartree-Fock equations are solved for finite nuclei \osi , \caf\ and \cafe . In the second approach the effect of correlations are treated in the Brueckner-Hartree-Fock approximation directly for the finite nuclei, but the modifications of the Dirac spinors in the medium are derived from nuclear matter assuming a local-density approximation. Both approaches yield rather similar results for binding energies and radii in fair agreement with experimental data. The importance of the density dependent correlation effects is demonstrated and different ingredients to the spin-orbit splitting in the shell-model of the nucleus are discussed.
description: 26 pages, 3 figures not included, TU-93-2809
Formation of singularities for viscosity solutions of Hamilton-Jacobi equations in higher dimensions
Creators: name: Kossioris, Georgios T.
Publisher: name: Carnegie Mellon University
Year: 1991
Subjects: subject: 19999 Mathematical Sciences not elsewhere classified
subject: FOS: Mathematics

description: Abstract: "In this work we study the generation of singularities (shock waves) of the solution of the Cauchy problem for Hamilton-Jacobi equations in several space variables, under no assumption on convexity or concavity of the hamiltonian. We study the problem in the class of viscosity solutions, which are the correct class of weak solutions. We first examine the way the characteristics cross by identifying the set of critical points of the characteristic manifold with the caustic set of the related lagrangian mapping. We construct the viscosity solution by selecting a single-valued branch of the multi-valued function given as a solution by the method of characteristics. We finally discuss how the shocks propagate and undergo catastrophe in the case of two space variables."
Displacemon electromechanics: how to detect quantum interference in a nanomechanical resonator
Creators: name: Khosla, Kiran E.
name: Vanner, Michael R.
name: Ares, Natalia
name: Laird, Edward A.
Publisher: name: arXiv
Year: 2017
Subjects: subject: Quantum Physics (quant-ph)
subject: FOS: Physical sciences

description: We introduce the `displacemon' electromechanical architecture that comprises a vibrating nanobeam, e.g. a carbon nanotube, flux coupled to a superconducting qubit. This platform can achieve strong and even ultrastrong coupling enabling a variety of quantum protocols. We use this system to describe a protocol for generating and measuring quantum interference between two trajectories of a nanomechanical resonator. The scheme uses a sequence of qubit manipulations and measurements to cool the resonator, apply an effective diffraction grating, and measure the resulting interference pattern. We simulate the protocol for a realistic system consisting of a vibrating carbon nanotube acting as a junction in a superconducting qubit, and we demonstrate the feasibility of generating a spatially distinct quantum superposition state of motion containing more than $10^6$ nucleons.
description: 12 pages, 7 figures
title: Ubykh2, listeXXV1
Creators: name: Michailovsky, Boyd
name: Dumézil, Georges
Publisher: name: COCOON - https://cocoon.huma-num.fr (Huma-Num - CNRS)
publisherIdentifier: https://ror.org/04ces3204
publisherIdentifierScheme: ROR
Year: 2011
Subjects: subject: Ubykh
subject: uby

description: Conforms to: doi:10.34847/cocoon.49aefa90-8c1f-3ba8-a099-0ebefc6a2aa7
Directionality of THz emission from photoinduced gas plasmas
Creators: name: Köhler, Christian
name: Cabrera-Granado, Eduardo
name: Babushkin, Ihar
name: Bergé, Luc
name: Herrmann, Joachim
name: Skupin, Stefan
Publisher: name: Weierstrass Institute
Year: 2011
Subjects: subject: THz emission
subject: photoinduced plasma
subject: nonlinear optics
subject: 35Q60
subject: 78A60
subject: 76X05

description: Forward and backward THz emission by ionizing two-color laser pulses in gas is investigated by means of a simple semi-analytical model based on Jefimenko's equation and rigorous Maxwell simulations in one and two dimensions. We find the emission in backward direction having a much smaller spectral bandwidth than in forward direction and explain this by interference effects. Forward THz radiation is generated predominantly at the ionization front and is thus almost not affected by the opacity of the plasma, in excellent agreement with results obtained from a unidirectional pulse propagation model.
MPEC 2024-E190 : DAILY ORBIT UPDATE (2024 March 15)
Creators: name: Minor Planet Center Staff
Publisher: name: The Minor Planet Center
Year: 2024
Subjects: subject: Small Solar System bodies
valueUri: http://astrothesaurus.org/uat/1469

description: The Minor Planet Electronic Circulars contain information on unusual minor planets, routine data on comets and natural satellites, and occasional editorial announcements.  They are published on behalf of Division F of the International Astronomical Union by the Minor Planet Center, Smithsonian Astrophysical Observatory, Cambridge, MA 02138, U.S.A.
Unique continuation for many-body Schrödinger operators and the Hohenberg-Kohn theorem. II. The Pauli Hamiltonian
Creators: name: Garrigue, Louis
Publisher: name: arXiv
Year: 2019
Subjects: subject: Mathematical Physics (math-ph)
subject: Analysis of PDEs (math.AP)
subject: Quantum Physics (quant-ph)
subject: FOS: Physical sciences
subject: FOS: Mathematics

description: We prove the strong unique continuation property for many-body Pauli operators with external potentials, interaction potentials and magnetic fields in $L^p\loc(\R^d)$, and with magnetic potentials in ${L^{q}\loc(\R^d)}$, where ${p > \max(2d/3,2)}$ and ${q > 2d}$. For this purpose, we prove a singular Carleman estimate involving fractional Laplacian operators.
Nonlinear Network description for many-body quantum systems in continuous space
Creators: name: Ruggeri, Michele
name: Moroni, Saverio
name: Holzmann, Markus
Publisher: name: arXiv
Year: 2017
Subjects: subject: Other Condensed Matter (cond-mat.other)
subject: FOS: Physical sciences

description: We show that the recently introduced iterative backflow renormalization can be interpreted as a general neural network in continuum space with non-linear functions in the hidden units. We use this wave function within Variational Monte Carlo for liquid $^4$He in two and three dimensions, where we typically find a tenfold increase in accuracy over currently used wave functions. Furthermore, subsequent stages of the iteration procedure define a set of increasingly good wave functions, each with its own variational energy and variance of the local energy: extrapolation of these energies to zero variance gives values in close agreement with the exact values. For two dimensional $^4$He, we also show that the iterative backflow wave function can describe both the liquid and the solid phase with the same functional form -a feature shared with the Shadow Wave Function, but now joined by much higher accuracy. We also achieve significant progress for liquid $^3$He in three dimensions, improving previous variational and fixed-node energies for this very challenging fermionic system.
Tailoring THz radiation by controlling tunnel photoionization events in gases
Creators: name: Babushkin, Ihar
name: Skupin, Stefan
name: Husakou, Anton
name: Köhler, Christian
name: Cabrera-Granado, Eduardo
name: Bergé, Luc
name: Herrmann, Joachim
Publisher: name: Weierstrass Institute
Year: 2011
Subjects: subject: THz emission
subject: photoinduced plasma
subject: nonlinear optics
subject: 35Q60
subject: 78A60
subject: 76X05

description: Applications ranging from nonlinear terahertz spectroscopy to remote sensing require broadband and intense THz radiation which can be generated by focusing two-color laser pulses into a gas. In this setup, THz radiation originates from the buildup of the electron density in sharp steps of attosecond duration due to tunnel ionization, and subsequent acceleration of free electrons in the laser field. We show that the spectral shape of the THz pulses generated by this mechanism is determined by superposition of contributions from individual ionization events. This provides a straightforward analogy with linear diffraction theory, where the ionization events play the role of slits in a grating. This analogy offers simple explanations for recent experimental observations and opens new avenues for THz pulse shaping based on temporal control of the ionization events. We illustrate this novel technique by tailoring the spectral width and position of the resulting radiation using multi-color pump pulses.
General Behavior of Double Beta Decay Amplitudes in the Quasiparticle Random Phase Approximation
Creators: name: Krmpotić, F.
Publisher: name: arXiv
Year: 1993
Subjects: subject: Nuclear Theory (nucl-th)
subject: FOS: Physical sciences

description: Simple formulae for the $0^+\to 0^+$ double beta decay matrix elements, as a function of the particle-particle strength $g^{pp}$, have been designed within the quasiparticle random phase approximation. The $2ν$ amplitude is a bilinear function of $g^{pp}$, and all $0ν$ moments behave as ratios of a linear function and the square root of another linear function of $g^{pp}$. It is suggested that these results are of general validity and that any modifications of the nuclear hamiltonian or the configuration space cannot lead to a different functional dependence.
description: 12 pages text (REVTEX) and 2 figures upon request, to be published in Phys. Rev. C
title: Ubykh2, listeXXV2
Creators: name: Michailovsky, Boyd
name: Dumézil, Georges
Publisher: name: COCOON - https://cocoon.huma-num.fr (Huma-Num - CNRS)
publisherIdentifier: https://ror.org/04ces3204
publisherIdentifierScheme: ROR
Year: 2011
Subjects: subject: Ubykh
subject: uby

description: Conforms to: doi:10.34847/cocoon.49aefa90-8c1f-3ba8-a099-0ebefc6a2aa7
On the bolometric quiescent luminosity and luminosity swing of black hole candidate and neutron star low mass X-ray transients
Creators: name: Campana, Sergio
name: Stella, Luigi
Publisher: name: arXiv
Year: 2000
Subjects: subject: Astrophysics (astro-ph)
subject: FOS: Physical sciences

description: Low mass X-ray transients (LMXRTs) hosting black hole candidates (BHCs) display on average a factor of ~100 larger swing in the minimum (quiescent) to maximum (outburst) X-ray luminosity than neutron stars (NSs), despite the fact that the swing in the mass inflow rate is likely in the same range. Advection dominated accretion flows (ADAFs) were proposed to interpret such a difference. The residual optical/UV emission of quiescent LMXRTs, after subtraction of the companion star spectrum, is produced by synchrotron radiation in the (latest version) of ADAF and therefore is part of the ADAF's luminosity budget. We demonstrate that, once the residual optical/UV emission is taken into account, the bolometric luminosity swing of BHCs is consistent with that of NSs. We explore here an alternative scenario to ADAFs in which very little mass accretion onto the collapsed star takes place in the quiescence intervals. The residual optical/UV emission of BHCs are expected to derive from the energy released by the matter transferred from the companion star at radii comparable to the circularisation radius. The quiescent X-ray luminosity originates either from accretion onto the BH at very low rates and/or from coronal activity in the companion star or in the outer disk. For comparably small mass inflow rates, the NSs in these systems are likely in the radio pulsar regime. In the interaction of the radio pulsar relativistic wind with matter transferred from the companion star, a shock forms, the power law-like emission of which powers both the harder X-ray emission and most of the residual optical/UV. The soft, thermal-like X-ray component may arise from the cooling of the NS surface. This scenario matches well both the X-ray and bolometric luminosity swing of LMXRTs. (ABRIDGED).
description: 13 pages (including 2 postscript figures - use emulateapj macro). Accepted for publication in ApJ
One-Pass Sparsified Gaussian Mixtures
Creators: name: Kightley, Eric
name: Becker, Stephen
Publisher: name: arXiv
Year: 2019
Subjects: subject: Machine Learning (cs.LG)
subject: Machine Learning (stat.ML)
subject: FOS: Computer and information sciences

description: We present a one-pass sparsified Gaussian mixture model (SGMM). Given $N$ data points in $P$ dimensions, $X$, the model fits $K$ Gaussian distributions to $X$ and (softly) classifies each point to these clusters. After paying an up-front cost of $\mathcal{O}(NP\log P)$ to precondition the data, we subsample $Q$ entries of each data point and discard the full $P$-dimensional data. SGMM operates in $\mathcal{O}(KNQ)$ time per iteration for diagonal or spherical covariances, independent of $P$, while estimating the model parameters in the full $P$-dimensional space, making it one-pass and hence suitable for streaming data. We derive the maximum likelihood estimators for the parameters in the sparsified regime, demonstrate clustering on synthetic and real data, and show that SGMM is faster than GMM while preserving accuracy.
description: submitted to IEEE DSW 2019
Forking in Short and Tame Abstract Elementary Classes
Creators: name: Boney, Will
name: Grossberg, Rami
Publisher: name: Carnegie Mellon University
Year: 2015
Subjects: subject: 19999 Mathematical Sciences not elsewhere classified
subject: FOS: Mathematics

description: We develop a notion of forking for Galois-types in the context of Abstract Elementary Classes (AECs). Under the hypotheses that an AEC K is tame, type-short, and failure of an order-property, we consider Definition 1. Let M0 ≺ N be models from K and A be a set. We say that the Galois-type of A over N does not fork over M0, written A^M0 N, iff for all small a ∈ A and all small N − ≺ N, we have that Galois-type of a over N − is realized in M0. Assuming property (E) (Existence and Extension, see Definition 3.3) we show that this non-forking is a well behaved notion of independence, in particular satisfies symmetry and uniqueness and has a corresponding U-rank. We find conditions for a universal local character, in particular derive superstability-like property from little more than categoricity in a “big cardinal”. Finally, we show that under large cardinal axioms the proofs are simpler and the non-forking is more powerful. In [BGKV], it is established that, if this notion is an independence notion, then it is the only one.
The Cap in the Hat: Unoriented 2D Strings and Matrix(-Vector) Models
Creators: name: Bergman, Oren
name: Hirano, Shinji
Publisher: name: arXiv
Year: 2003
Subjects: subject: High Energy Physics - Theory (hep-th)
subject: FOS: Physical sciences

description: We classify the possible bosonic and Type 0 unoriented string theories in two dimensions, and find their dual matrix(-vector) models. There are no RP^2 R-R tadpoles in any of the models, but many of them possess a massless tachyon tadpole. Thus all the models we find are consistent two-dimensional string vacua, but some get quantum corrections to their classical tachyon background. Where possible, we solve the tadpole cancellation condition, and find all the tachyon tadpole-free theories.
description: 34 pages, LaTeX; Errors corrected in some of the open string representations in tables 1, 2 and 3. References and acknowledgments added
From an adhesive to a brittle delamination model in thermo-visco-elasticity
Creators: name: Rossi, Riccarda
name: Thomas, Marita
Publisher: name: Weierstrass Institute
Year: 2012
Subjects: subject: Rate-independent evolution of adhesive contact
subject: brittle delamination
subject: Kelvin-Voigt visco-elasticity
subject: nonlinear heat equation
subject: Mosco-convergence
subject: functions of bounded variation
subject: 35K85
subject: 74R10
subject: 47J20
subject: 49J45
subject: 49S05
subject: 74F07

description: We address the analysis of a model for brittle delamination of two visco-elastic bodies, bonded along a prescribed surface. The model also encompasses thermal effects in the bulk. The related PDE system for the displacements, the absolute temperature, and the delamination variable has a highly nonlinear character. On the contact surface, it features frictionless Signorini conditions and a nonconvex, brittle constraint acting as a transmission condition for the displacements. We prove the existence of (weak/energetic) solutions to the associated Cauchy problem, by approximating it in two steps with suitably regularized problems. We perform the two consecutive passages to the limit via refined variational convergence techniques.
title: Potential for Biocontrol of Environmental Vibrio Spp. by Predatory Bacteria Bacteriovorax
Creators: name: Tennis, Patrick
Publisher: name: Old Dominion University
publisherIdentifier: https://ror.org/04zjtrb98
publisherIdentifierScheme: ROR
Year: 2015

description: The scale of predator-prey interactions varies from the iconic (e.g., lions and gazelles) to the microscopic (e.g., protists and bacteria). Bdellovibrio-and-like-organisms (BALOs) are bacteria that prey upon other Gram-negative bacteria, including pathogens. In particular, the halophilic genus Vibrio, many species of which are disease agents, has been shown to be susceptible to attack by BALOs. One motivation of the present research is to assess the potential for biocontrol of Vibrio by Bacteriovorax. This investigation is the first to test the susceptibility of Vibrio strains (n = 26) originating from a variety of geographic locations to predation by three phylogenetically distinct Bacteriovorax clusters.

In suspension experiments, I used the change in optical density after three days to indicate predation. In 77 of 78 trials, optical density decreased over three days (mean OD decrease = -0.229, st. dev. = 0.09). Additionally, I used quantitative real-time PCR to measure the copy numbers of predator and prey in the same co-cultures. In 77 of 78 trials, copy number of the predators increased over three days, indicating their abundant growth. During the same time, copy number of the prey decreased as they were consumed. The cluster Ill strain reduced 23 of 26 Vibrio strains and the cluster IX and XI strains all but one strain each. Among those vibrios for which the extent of predation extent was low, none were in common among the three predator strains. In parallel experiments, I selected 10 Vibrio strains most susceptible to Bacteriovorax attack in suspension, and investigated their resistance to predation when they had formed biofilms. Inferred from a 5-day change in optical density, cluster Ill significantly reduced biofilms of 5 of the 10 Vibrio strains, cluster IX reduced 3 strains, and cluster XI reduced only 1 Vibrio strain. The most predacious Bacteriovorax in the biofilm experiments was the cluster III strain, whereas in the suspension experiments, it was the cluster XI strain. Given multiple differences in methods, direct comparisons between results of suspension and biofilm experiments are not possible. Overall, however, Bacteriovorax exhibited strong predation of vibrios in suspension and weaker predation in biofilm.

These results, as well as those of other researchers, are encouraging for the prospective use of Bacteriovorax for economic and human health benefits. Especially when combined in cluster pairs, Bacteriovorax may serve as a probiotic or antibiotic against environmental Vibrio in suspension and biofilm.
Forking in pregeometries.
Creators: name: Grossberg, Rami
name: Lessmann, Olivier
Publisher: name: Carnegie Mellon University
Year: 1998
Subjects: subject: 19999 Mathematical Sciences not elsewhere classified
subject: FOS: Mathematics

description: Abstract: "The aim of this paper is to set the foundation to separate geometric model theory from model theory. Our thesis is that it is possible to lift results from geometric model theory to non first order logic (e.g. L[subscript omegaΓéü, omega]). We introduce a relation between subsets of a pregeometry and show that it satisfies all the formal properties that forking satisfies in simple first order theories. This is important when one is trying to lift forking to nonelementary classes, in contexts where there exists pregeometries but not necessarily a well-behaved dependence relation (see for example [HySh]). We use these to reproduce S. Buechler's characterization of local modularity in general. These results are used by Lessmann to prove an abstract group configuration theorem in [Le2]."
Particle Heating by Nonlinear Alfvenic Turbulence in ADAFs
Creators: name: Medvedev, Mikhail V.
Publisher: name: arXiv
Year: 2000
Subjects: subject: Astrophysics (astro-ph)
subject: FOS: Physical sciences

description: Particle heating in advection-dominated accretion flows (ADAFs) by nonlinear MHD (Alfvenic) turbulence is investigated. Such turbulence with highly-fluctuating magnetic fields, $\tilde B\sim B_0$, is believed to be naturally produced by the magnetic shearing instability near the nonlinear saturation. It is shown that the energy is dissipated in the parallel cascade, which occurs due to nonlinear compressibility of high-amplitude turbulence, and predominantly heats protons, but not electrons. The conservative limit on the electron--to--proton heating fraction is $δ\lesssim{\rm few}\times10^{-2}$.
description: 10 pages, 3 figures. Related works may be found at http://cfa-www.harvard.edu/~mmedvede/
Spin Hall effect and Weak Antilocalization in Graphene/Transition Metal Dichalcogenide Heterostructures
Creators: name: Garcia, Jose H.
name: Cummings, Aron W.
name: Roche, Stephan
Publisher: name: arXiv
Year: 2017
Subjects: subject: Mesoscale and Nanoscale Physics (cond-mat.mes-hall)
subject: FOS: Physical sciences

description: We report on a theoretical study of the spin Hall Effect (SHE) and weak antilocal-ization (WAL) in graphene/transition metal dichalcogenide (TMDC) heterostructures, computed through efficient real-space quantum transport methods, and using realistic tight-binding models parametrized from ab initio calculations. The graphene/WS 2 system is found to maximize spin proximity effects compared to graphene on MoS 2 , WSe 2 , or MoSe 2 , with a crucial role played by disorder, given the disappearance of SHE signals in the presence of strong intervalley scattering. Notably, we found that stronger WAL effects are concomitant with weaker charge-to-spin conversion efficiency. For further experimental studies of graphene/TMDC heterostructures, our findings provide guidelines for reaching the upper limit of spin current formation and for fully harvesting the potential of two-dimensional materials for spintronic applications.
description: This document is the unedited Author's version of a Submitted Work that was subsequently accepted for publication in Nano Letters, copyright\c{opyright}American Chemical Society after peer review. To access the final edited and published work see http://pubs.acs.org/articlesonrequest/AOR-c2pZ8WnmG7pcF4MIivjz
Square root relaxation: two possible mechanisms
Creators: name: Villain, Jacques
Publisher: name: arXiv
Year: 2005
Subjects: subject: Statistical Mechanics (cond-mat.stat-mech)
subject: Materials Science (cond-mat.mtrl-sci)
subject: FOS: Physical sciences

description: Magnetic relaxation in large spin molecular paramagnets is often found to behave as the square root of time at short times t. This behaviour was explained by Prokofiev & Stamp as arising from dipole interactions between molecular spins. However, as observed by Miyashita & Saito, the same behaviour can arise from a different mechanism which, in the present work, is related to hyperfine interactions. The Miyashita-Saito scheme is found to be possible at short times if the nuclear longitudinal spin relaxation is very slow. In the case of moderately slow nuclear spin relaxation, the electronic magnetization variation is initially proportional to t, then to the square root of t and finally to decay exponentially. This behaviour may be mostly expected in dilute systems.
Flips in Graphs
Creators: name: Bohman, Tom
name: Dudek, Andrzej
name: Frieze, Alan
name: Pikhurko, Oleg
Publisher: name: Carnegie Mellon University
Year: 2010
Subjects: subject: 19999 Mathematical Sciences not elsewhere classified
subject: FOS: Mathematics

description: We study a problem motivated by a question related to quantumerror-correcting codes. Combinatorially, it involves the following graph parameter: f(G) = min {|A| + |{x ∈ V \ A : dA(x) is odd}| : A 6= ∅} , where V is the vertex set of G and dA(x) is the number of neighbors of x in A. We give asymptotically tight estimates of f for the random graph Gn,p when p is constant. Also, if f(n) = max {f(G) : |V (G)| = n} then we show that f(n) ≤ (0.382 + o(1))n.
title: Ubykh2, listeXXV3
Creators: name: Michailovsky, Boyd
name: Dumézil, Georges
Publisher: name: COCOON - https://cocoon.huma-num.fr (Huma-Num - CNRS)
publisherIdentifier: https://ror.org/04ces3204
publisherIdentifierScheme: ROR
Year: 2011
Subjects: subject: Ubykh
subject: uby

description: Conforms to: doi:10.34847/cocoon.49aefa90-8c1f-3ba8-a099-0ebefc6a2aa7
The Coleman Junction horizon in Archer and Clay Counties, Texas
Creators: name: Nickell, Clarence Oliver
Publisher: name: The University of Texas at Austin
Year: 1932
Subjects: subject: Geology--Texas--Archer County
subject: Geology--Texas--Clay County

description: The Coleman Junction limestone was mapped from Coleman County northward through Callahan and Shackelford counties by Plummer and Moore, and continued through Throckmorton County by Hornberger. Work presented herewith carries the Coleman Junction or its equivalent horizon through Archer and Clay counties to the River in the northeast corner of Clay County. Photographs of typical exposures and measured sections of the outcrop or its equivalent horizon are given for important points, from northeastern Throckmorton County through Archer and Clay counties to the Red River. Two small maps are included showing correlations by Hubbard and Thompson, and by Tomlinson. Four large maps are used; one each of Archer and Clay counties showing the course of the outcrop or its equivalent horizon as interpreted by the writer; and one each of Archer and Clay counties showing the interpretation by Timms for the same area. Although the tracing of the Coleman Junction or its equivalent horizon constitutes the central problem of this thesis evidence is also presented indicating that the Coleman Junction correlates approximately with the Ryan Sandstone of Oklahoma.
Resolvability of Hamming Graphs
Creators: name: Laird, Lucas
name: Tillquist, Richard C.
name: Becker, Stephen
name: Lladser, Manuel E.
Publisher: name: arXiv
Year: 2019
Subjects: subject: Discrete Mathematics (cs.DM)
subject: Combinatorics (math.CO)
subject: Optimization and Control (math.OC)
subject: FOS: Computer and information sciences
subject: FOS: Mathematics
subject: 05C12, 05C50, 05C62, 68R10, 90C35, 92C40

description: A subset of vertices in a graph is called resolving when the geodesic distances to those vertices uniquely distinguish every vertex in the graph. Here, we characterize the resolvability of Hamming graphs in terms of a constrained linear system and deduce a novel but straightforward characterization of resolvability for hypercubes. We propose an integer linear programming method to assess resolvability rapidly, and provide a more costly but definite method based on Gröbner bases to determine whether or not a set of vertices resolves an arbitrary Hamming graph. As proof of concept, we identify a resolving set of size 77 in the metric space of all octapeptides (i.e., proteins composed of eight amino acids) with respect to the Hamming distance; in particular, any octamer may be readily represented as a 77-dimensional real-vector. Representing k-mers as low-dimensional numerical vectors may enable new applications of machine learning algorithms to symbolic sequences.
description: 19 pages, 2 figures
Libor model with expiry-wise stochastic volatility and displacement
Creators: name: Ladkau, Marcel
name: Schoenmakers, John G. M.
name: Zhang, Jianing
Publisher: name: Weierstrass Institute
Year: 2012
Subjects: subject: Displaced Libor models
subject: stochastic volatility
subject: calibration to cap-strike-maturity matrix
subject: swaption pricing
subject: 91G30
subject: 91G60
subject: 60H10

description: We develop a multi-factor stochastic volatility Libor model with displacement, where each individual forward Libor is driven by its own square-root stochastic volatility process. The main advantage of this approach is that, maturity-wise, each square-root process can be calibrated to the corresponding cap(let)vola-strike panel at the market. However, since even after freezing the Libors in the drift of this model, the Libor dynamics are not affine, new affine approximations have to be developed in order to obtain Fourier based (approximate) pricing procedures for caps and swaptions. As a result, we end up with a Libor modeling package that allows for efficient calibration to a complete system of cap/swaption market quotes that performs well even in crises times, where structural breaks in vola-strike-maturity panels are typically observed.
title: Ubykh2, listeXXV4
Creators: name: Michailovsky, Boyd
name: Dumézil, Georges
Publisher: name: COCOON - https://cocoon.huma-num.fr (Huma-Num - CNRS)
publisherIdentifier: https://ror.org/04ces3204
publisherIdentifierScheme: ROR
Year: 2011
Subjects: subject: Ubykh
subject: uby

description: Conforms to: doi:10.34847/cocoon.49aefa90-8c1f-3ba8-a099-0ebefc6a2aa7
On the reaction coordinate for seeded crystallisation
Creators: name: Jungblut, S.
name: Dellago, C.
Publisher: name: arXiv
Year: 2017
Subjects: subject: Soft Condensed Matter (cond-mat.soft)
subject: FOS: Physical sciences

description: Small pre-structured seeds introduced into an undercooled fluid are known to increase the crystal nucleation rate by some orders of magnitude, if the structure of the seeds is commensurate with the bulk crystalline phase. The presence of such seeds also alters the crystallisation mechanism by favouring particular structures at the early stages of the nucleation process. Here, we study with computer simulations the effect of small face-centred cubic and body-centred cubic seeds on the crystallisation of a Lennard-Jones liquid in the strongly undercooled regime. We find that seeds with body-centred cubic structure lead to a larger enhancement of the crystallisation rate than face-centred cubic seeds. An analysis of recurrence times reveals that the size of the largest crystalline cluster used as reaction coordinate is affected by pronounced memory effects, which depend on the particular seed structure and point to the importance of structural information in the definition of a good reaction coordinate for crystallisation.
description: 7 pages, 4 figures
Safe Feature Elimination for Non-Negativity Constrained Convex Optimization
Creators: name: Folberth, James
name: Becker, Stephen
Publisher: name: arXiv
Year: 2019
Subjects: subject: Optimization and Control (math.OC)
subject: Computer Vision and Pattern Recognition (cs.CV)
subject: FOS: Mathematics
subject: FOS: Computer and information sciences
subject: 49N15, 90C25, 90C46

description: Inspired by recent work on safe feature elimination for $1$-norm regularized least-squares, we develop strategies to eliminate features from convex optimization problems with non-negativity constraints. Our strategy is safe in the sense that it will only remove features/coordinates from the problem when they are guaranteed to be zero at a solution. To perform feature elimination we use an accurate, but not optimal, primal-dual feasible pair, making our methods robust and able to be used on ill-conditioned problems. We supplement our feature elimination problem with a method to construct an accurate dual feasible point from an accurate primal feasible point; this allows us to use a first-order method to find an accurate primal feasible point, then use that point to construct an accurate dual feasible point and perform feature elimination. Under reasonable conditions, our feature elimination strategy will eventually eliminate all zero features from the problem. As an application of our methods we show how safe feature elimination can be used to robustly certify the uniqueness of non-negative least-squares (NNLS) problems. We give numerical examples on a well-conditioned synthetic NNLS problem and a on set of 40000 extremely ill-conditioned NNLS problems arising in a microscopy application.
description: v2: added pointer to version to appear in Journal of Optimization Theory and Applications
Geology of Hutto quadrangle, Williamson County, Texas
Creators: name: Gordon, James Eddie, 1925-
Publisher: name: The University of Texas at Austin
Year: 1951
Subjects: subject: Geology--Texas--Williamson County

description: This paper presents the surface geology of the Hutto Quadrangle, southeastern Williamson County, Texas. Outcropping formations are Austin chalk, Burditt marl, and Taylor marl of the Gulf series (upper Cretaceous). Six faunal zones in the middle and upper portions of the Austin group can be differentiated and used in detailed stratigraphic studies. Three Quaternary formations are mapped and described, but not formally named. The structure of the Quadrangle is relatively simple, being part of a gentle eastward sloping homocline, faulted by the Balcones fault system.
title: ADCO, Privilèges de l'Ordre de Cîteaux en matière de succession (Fin XVe siècle), Cart. 176 (11 H 8), f. 0068
Creators: name: de la Côte d'Or, Archives départementales
name: Archives Départementales De La Côte-D'Or
name: Petot, Frédérique
name: Projet CBMA
name: CG21/F.PETOT/2017
Publisher: name: NAKALA - https://nakala.fr (Huma-Num - CNRS)
publisherIdentifier: https://ror.org/04ces3204
publisherIdentifierScheme: ROR
Year: 2020
Subjects: subject: cartulaire
subject: Corpus Burgundiae Medii Aevi
subject: Chartes de la Bourgogne du Moyen Âge
subject: LaMOP
subject: Laboratoire de Médiévistique Occidentale de Paris

description: Privilèges de l'Ordre de Cîteaux en matière de succession (Fin XVe siècle), Archives départementales de la Côte-d'Or, Cart. 176 (11 H 8), f. 0068, Numérisation en mode image.
description: Relation: http://www.cbma-project.eu/
description: Bibliographic citation: Privilèges de l'Ordre de Cîteaux en matière de succession (Fin XVe siècle), Archives départementales de la Côte-d'Or, Cart. 176 (11 H 8), f. 0068, in Projet CBMA - Corpus Burgundiae Medii Aevi [Ressource en ligne], https:// manuscrits.cbma-project.eu/
description: Provenance: https://www.geonames.org/3024876
description: Provenance: http://www.idref.fr/030974844/id
description: Provenance: https://catalogue.bnf.fr/ark:/12148/cb12228351v
description: Provenance: abbaye de Cîteaux
description: Provenance: http://www.wikidata.org/entity/Q843261
Handling cellwise outliers by sparse regression and robust covariance
Creators: name: Raymaekers, Jakob
name: Rousseeuw, Peter J.
Publisher: name: arXiv
Year: 2019
Subjects: subject: Methodology (stat.ME)
subject: Computation (stat.CO)
subject: FOS: Computer and information sciences

description: We propose a data-analytic method for detecting cellwise outliers. Given a robust covariance matrix, outlying cells (entries) in a row are found by the cellHandler technique which combines lasso regression with a stepwise application of constructed cutoff values. The penalty term of the lasso has a physical interpretation as the total distance that suspicious cells need to move in order to bring their row into the fold. For estimating a cellwise robust covariance matrix we construct a detection-imputation method which alternates between flagging outlying cells and updating the covariance matrix as in the EM algorithm. The proposed methods are illustrated by simulations and on real data about volatile organic compounds in children.
Variational convergence of gradient flows and rate-independent evolutions in metric spaces
Creators: name: Mielke, Alexander
name: Rossi, Riccarda
name: Savaré, Giuseppe
Publisher: name: Weierstrass Institute
Year: 2012
Subjects: subject: Doubly nonlinear equations
subject: evolution in metric spaces
subject: generalized gradient flows
subject: viscous regularization
subject: vanishing-viscosity limit
subject: BV solutions
subject: rate-independent systems
subject: 49Q20
subject: 58E99

description: We study the asymptotic behaviour of families of gradient flows in a general metric setting, when the metric-dissipation potentials degenerate in the limit to a dissipation with linear growth. We present a general variational definition of BV solutions to metric evolutions, showing the different characterization of the solution in the absolutely continuous regime, on the singular Cantor part, and along the jump transitions. By using tools of metric analysis, BV functions and blow-up by time rescaling, we show that this variational notion is stable with respect to a wide class of perturbations involving energies, distances, and dissipation potentials. As a particular application, we show that BV solutions to rate-independent problems arise naturally as a limit of p-gradient flows, p>1, when the exponents p converge to 1.
title: Trace Elements in Northern Virginia Middle Ordovician Carbonates: Implications for Diagenesis
Creators: name: Strauss, Ruth Ann
Publisher: name: Old Dominion University
publisherIdentifier: https://ror.org/04zjtrb98
publisherIdentifierScheme: ROR
Year: 1988

description: Ninety-three carbonate rock samples collected from four of the major lithofacies types present in the Middle Ordovician limestone sequence of northwestern Virginia were analyzed to investigate whether the lithofacies bear the geochemical signature of the depositional and/or the diagenetic environment. Significant variations in Cr, Fe, Mg, Mn and Sr concentrations exist among the major lithofacies types. Low levels of Sr in both New Market lithofacies are indicative of an open system during diagenesis. Dissimilar Fe and Mn concentrations between these, however, reflect water chemistry differences in the depositional environment. Increasingly greater Cr, Fe, Mn, and Sr concentrations in the Lincolnshire and Edinburg Lithofacies are primarily the result of the chemistry of the diagenetic environment. Factors which may have influenced the chemistry of diagenetically formed calcites in these lithofacies include: a lowering of the redox potential during burial, the chemistry of entering diagenetic solutions derived from argillaceous basin sediments, and reduced permeability caused by sediment compaction.
Exploration of H2 binding to the [NiFe]-hydrogenase active site with multiconfigurational density functional theory
Creators: name: Dong, Geng
name: Ryde, Ulf
name: Jensen, Hans Jørgen Aa.
name: Hedegård, Erik D.
Publisher: name: arXiv
Year: 2017
Subjects: subject: Chemical Physics (physics.chem-ph)
subject: FOS: Physical sciences

description: The combination of density functional theory (DFT) with a multiconfigurational wave function is an efficient way to include dynamical correlation in calculations with multiconfiguration self-consistent field wave functions. These methods can potentially be employed to elucidate reaction mechanisms in bio-inorganic chemistry, where many other methods become either too computationally expensive or too inaccurate. In this paper, a complete active space (CAS) short-range DFT (CAS-srDFT) hybrid was employed to investigate a bio-inorganic system, namely H2 binding to the active site of [NiFe] hydrogenase. This system was previously investigated with coupled-cluster (CC) and multiconfigurational methods in form of cumulant-approximated second-order perturbation theory, based on the density matrix renormalization group (DMRG). We find that it is more favorable for H2 to bind to Ni than to Fe, in agreement with previous CC and DMRG calculations. The accuracy of CAS-srDFT is comparable to both CC and DMRG, despite that much smaller active spaces were employed. This enhanced efficiency at smaller active spaces shows that CAS-srDFT can become a useful method for bio-inorganic chemistry.
description: 22 pages
Hidden sl(2,R) Symmetry in 2D CFTs and the Wave Function of 3D Quantum Gravity
Creators: name: Nitti, F.
name: Porrati, M.
Publisher: name: arXiv
Year: 2003
Subjects: subject: High Energy Physics - Theory (hep-th)
subject: FOS: Physical sciences

description: We show that all two-dimensional conformal field theories possess a hidden sl(2,R) affine symmetry. More precisely, we add appropriate ghost fields to an arbitrary CFT, and we use them to construct the currents of sl(2,R). We then define a BRST operator whose cohomology defines a physical subspace where the extended theory coincides with the original CFT. We use the sl(2,R) algebra to construct candidate wave functions for 3-d quantum gravity coupled to matter, and we discuss their viability.
description: Minor misprints corrected.Eight references added. To appear in JHEP.34 pages, LaTeX
Thin-film models for viscoelastic liquid bi-layers
Creators: name: Jachalski, Sebastian
name: Münch, Andreas
name: Wagner, Barbara
Publisher: name: Weierstrass Institute
Year: 2015
Subjects: subject: fluid dynamics
subject: viscoelasticty
subject: thin-film models
subject: two-phase flow
subject: asymptotic methods
subject: numerical solution
subject: 76A20
subject: 76Mxx

description: In this work we consider a two-layer system of viscoelastic liquids of corotational Jeffreys' type dewetting from a Newtonian liquid substrates. We derive conditions that allow for the first time the asymptotically consistent reduction of the free boundary problem for the two-layer system to a system of coupled thin-film equations that incorporate the full nonlinear viscoelastic rheology. We show that these conditions are controlled by the order of magnitude of the viscosity ratio of the liquid layers and their thickness ratio. For pure Newtonian flow, these conditions lead to a thin-film model that couples a layer with a parabolic flow field to a layer described by elongational flow. For this system we establish asymptotic regimes that relate the viscosity ratio to a corresponding apparent slip. We then use numerical simulations to discuss the characteristic morphological and dynamical properties of viscoelastic films of corotational Jeffreys' type dewetting from a solid as well as liquid substrate.
A stochastic subspace approach to gradient-free optimization in high dimensions
Creators: name: Kozak, David
name: Becker, Stephen
name: Doostan, Alireza
name: Tenorio, Luis
Publisher: name: arXiv
Year: 2020
Subjects: subject: Optimization and Control (math.OC)
subject: FOS: Mathematics
subject: 90C06, 93B40, 65K10

description: We present a stochastic descent algorithm for unconstrained optimization that is particularly efficient when the objective function is slow to evaluate and gradients are not easily obtained, as in some PDE-constrained optimization and machine learning problems. The algorithm maps the gradient onto a low-dimensional random subspace of dimension $\ell$ at each iteration, similar to coordinate descent but without restricting directional derivatives to be along the axes. Without requiring a full gradient, this mapping can be performed by computing $\ell$ directional derivatives (e.g., via forward-mode automatic differentiation). We give proofs for convergence in expectation under various convexity assumptions as well as probabilistic convergence results under strong-convexity. Our method extends the well-known Gaussian smoothing technique to descent in subspaces of dimension greater than one, opening the doors to new analysis of Gaussian smoothing when more than one directional derivative is used at each iteration. We also provide a finite-dimensional variant of a special case of the Johnson-Lindenstrauss lemma. Experimentally, we show that our method compares favorably to coordinate descent, Gaussian smoothing, gradient descent and BFGS (when gradients are calculated via forward-mode automatic differentiation) on problems from the machine learning and shape optimization literature.
description: arXiv admin note: substantial text overlap with arXiv:1904.01145
Focal schemes to families of secant spaces to canonical curves
Creators: name: Hoff, Michael
Publisher: name: arXiv
Year: 2017
Subjects: subject: Algebraic Geometry (math.AG)
subject: FOS: Mathematics
subject: 14H51, 14M12, 14C34

description: This article is a generalisation of results of Ciliberto and Sernesi. For a general canonically embedded curve $C$ of genus $g\geq 5$, let $d\le g-1$ be an integer such that the Brill--Noether number $ρ(g,d,1)=g-2(g-d+1)\geq 1$. We study the family of $d$-secant $\mathbb{P}^{d-2}$'s to $C$ induced by the smooth locus of the Brill--Noether locus $W^1_d(C)$. Using the theory of foci and a structure theorem for the rank one locus of special $1$-generic matrices by Eisenbud and Harris, we prove a Torelli-type theorem for general curves by reconstructing the curve from its Brill--Noether loci $W^1_d(C)$ of dimension at least $1$.
description: 14 pages, to appear in: "Algorithmic and Experimental Methods in Algebra, Geometry, and Number Theory", DFG, SPP 1489