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Browsing by Subject "Physical Sciences"
Now showing items 1-20 of 153
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(0,2) hybrid models
(Journal of High Energy Physics, 2018-09-01)© 2018, The Author(s). We introduce a class of (0,2) superconformal field theories based on hybrid geometries, generalizing various known constructions. We develop techniques for the computation of the complete massless ... -
(1,1) L-space knots
(COMPOSITIO MATHEMATICA, 2018-05-01)We characterize the (1, 1) knots in the three-sphere and lens spaces that admit non-trivial L-space surgeries. As a corollary, 1-bridge braids in these manifolds admit non- trivial L-space surgeries. We also recover ... -
A baseline paleoecological study for the Santa Cruz Formation (late–early Miocene) at the Atlantic coast of Patagonia, Argentina
(Palaeogeography, Palaeoclimatology, Palaeoecology, 2010-06)Coastal exposures of the Santa Cruz Formation (late-early Miocene, southern Patagonia, Argentina) between the Coyle and Gallegos rivers have been a fertile ground for recovery of Miocene vertebrates for more than 100 years. ... -
A classical proof that the algebraic homotopy class of a rational function is the residue pairing
(Linear Algebra and Its Applications, 2020-06-15)© 2020 Elsevier Inc. Cazanave has identified the algebraic homotopy class of a rational function of 1 variable with an explicit nondegenerate symmetric bilinear form. Here we show that Hurwitz's proof of a classical result ... -
A formal Anthropocene is compatible with but distinct from its diachronous anthropogenic counterparts: a response to W.F. Ruddiman’s ‘three flaws in defining a formal Anthropocene’
(Progress in Physical Geography, 2019-06-01)© The Author(s) 2019. We analyse the ‘three flaws’ to potentially defining a formal Anthropocene geological time unit as advanced by Ruddiman (2018). (1) We recognize a long record of pre-industrial human impacts, but note ... -
A hybrid ion-atom trap with integrated high resolution mass spectrometer
(Review of Scientific Instruments, 2019-10-01)© 2019 Author(s). In this article, we describe the design, construction, and implementation of our ion-atom hybrid system incorporating a high resolution time of flight mass spectrometer (TOFMS). Potassium atoms (39K) in ... -
A microscopic model of the Stokes-Einstein relation in arbitrary dimension.
(The Journal of chemical physics, 2018-06)The Stokes-Einstein relation (SER) is one of the most robust and widely employed results from the theory of liquids. Yet sizable deviations can be observed for self-solvation, which cannot be explained by the standard ... -
A slicing obstruction from the $\frac {10}{8}$ theorem
(Proceedings of the American Mathematical Society, 2016-08-29)© 2016 American Mathematical Society. From Furuta’s 10/8 theorem, we derive a smooth slicing obstruction for knots in S3 using a spin 4-manifold whose boundary is 0-surgery on a knot. We show that this obstruction is able ... -
A stochastic-Lagrangian particle system for the Navier-Stokes equations
(Nonlinearity, 2008-11-01)This paper is based on a formulation of the Navier-Stokes equations developed by Constantin and the first author (Commun. Pure Appl. Math. at press, arXiv:math.PR/0511067), where the velocity field of a viscous incompressible ... -
An adaptive Euler-Maruyama scheme for SDEs: Convergence and stability
(IMA Journal of Numerical Analysis, 2007-01-01)The understanding of adaptive algorithms for stochastic differential equations (SDEs) is an open area, where many issues related to both convergence and stability (long-time behaviour) of algorithms are unresolved. This ... -
An Empirical Comparison of Multiple Imputation Methods for Categorical Data
(The American Statistician, 2017-04-03)© 2017 American Statistical Association. Multiple imputation is a common approach for dealing with missing values in statistical databases. The imputer fills in missing values with draws from predictive models estimated ... -
An energetic variational approach for ION transport
(Communications in Mathematical Sciences, 2014-03-06)The transport and distribution of charged particles are crucial in the study of many physical and biological problems. In this paper, we employ an Energy Variational Approach to derive the coupled Poisson-Nernst-Planck-N... -
An energy stable C0 finite element scheme for a quasi-incompressible phase-field model of moving contact line with variable density
(Journal of Computational Physics, 2020-03-15)In this paper, we focus on modeling and simulation of two-phase flow problems with moving contact lines and variable density. A thermodynamically consistent phase-field model with general Navier boundary condition is developed ... -
An improved approach to age-modeling in deep time: Implications for the Santa Cruz Formation, Argentina
(Bulletin of the Geological Society of America, 2020-01-01)© 2019 Geological Society of America. Accurate age-depth models for proxy records are crucial for inferring changes to the environment through space and time, yet traditional methods of constructing these models ... -
Analyzing X-ray tomographies of granular packings.
(The Review of scientific instruments, 2017-05)Starting from three-dimensional volume data of a granular packing, as, e.g., obtained by X-ray Computed Tomography, we discuss methods to first detect the individual particles in the sample and then analyze their properties. ... -
Anomalous dissipation in a stochastically forced infinite-dimensional system of coupled oscillators
(Journal of Statistical Physics, 2007-09-01)We study a system of stochastically forced infinite-dimensional coupled harmonic oscillators. Although this system formally conserves energy and is not explicitly dissipative, we show that it has a nontrivial invariant ... -
Ballistic Graphene Josephson Junctions from the Short to the Long Junction Regimes.
(Physical review letters, 2016-12-02)We investigate the critical current I_{C} of ballistic Josephson junctions made of encapsulated graphene-boron-nitride heterostructures. We observe a crossover from the short to the long junction regimes as the length of ... -
Behavior of different numerical schemes for random genetic drift
(BIT Numerical Mathematics, 2019-09-01)In the problem of random genetic drift, the probability density of one gene is governed by a degenerated convection-dominated diffusion equation. Dirac singularities will always be developed at boundary points as time evolves, ... -
Berge–Gabai knots and L–space satellite operations
(Algebraic & Geometric Topology, 2015-01-15)© 2014 Mathematical Sciences Publishers. All rights reserved. Let P(K) be a satellite knot where the pattern P is a Berge–Gabai knot (ie a knot in the solid torus with a nontrivial solid torus Dehn surgery) and the companion ... -
BigSMILES: A Structurally-Based Line Notation for Describing Macromolecules.
(ACS central science, 2019-09-12)Having a compact yet robust structurally based identifier or representation system is a key enabling factor for efficient sharing and dissemination of research results within the chemistry community, and such systems lay ...
