다중혈관 관상동맥 환자에서 y-문합을 이용하여 양쪽 내흉동맥만을 사용한 우회술의 조기 성적

Pairing symmetry in the cuprate superconductors is an important and controversial topic. The recent development of phase-sensitive tests, combined with the refinement of several other symmetry-sensitive techniques, has for the most part settled this controversy in favor of predominantly $d$-wave symmetry for a number of optimally hole- and electron-doped cuprates. This paper begins by reviewing the concepts of the order parameter, symmetry breaking, and symmetry classification in the context of the cuprates. After a brief survey of some of the key non-phase-sensitive tests of pairing symmetry, the authors extensively review the phase-sensitive methods, which use the half-integer flux-quantum effect as an unambiguous signature for $d$-wave pairing symmetry. A number of related symmetry-sensitive experiments are described. The paper concludes with a brief discussion of the implications, both fundamental and applied, of the predominantly $d$-wave pairing symmetry in the cuprates.

/pdf/pairing-symmetry-in-cuprate-superconductors-1fkabc810d.pdf

Pairing symmetry in cuprate superconductors

Capillarity and Wetting Phenomena: Drops, Bubbles, Pearls, Waves

We discuss recent advances on robust unfitted finite element methods on cut meshes. These methods are designed to facilitate computations on complex geometries obtained, for example, from computer- ...

CutFEM: Discretizing geometry and partial differential equations

An efficient ghost-cell immersed boundary method (GCIBM) for simulating turbulent flows in complex geometries is presented. A boundary condition is enforced through a ghost cell method. The reconstruction procedure allows systematic development of numerical schemes for treating the immersed boundary while preserving the overall second-order accuracy of the base solver. Both Dirichlet and Neumann boundary conditions can be treated. The current ghost cell treatment is both suitable for staggered and non-staggered Cartesian grids. The accuracy of the current method is validated using flow past a circular cylinder and large eddy simulation of turbulent flow over a wavy surface. Numerical results are compared with experimental data and boundary-fitted grid results. The method is further extended to an existing ocean model (MITGCM) to simulate geophysical flow over a three-dimensional bump. The method is easily implemented as evidenced by our use of several existing codes.

A Ghost-Cell Immersed Boundary Method for Flow in Complex Geometry

The implementation of a general finite element system on a parallel environment consisting of a Beowulf-type cluster is described, together with applications to fluid dynamics. Some overall performance and speedup results are reported.

/pdf/un-programa-general-de-elementos-finitos-en-paralelo-3tpnevmmt9.pdf

Un Programa General de Elementos Finitos en Paralelo

In this paper we describe and evaluate a geometric
mass-preserving redistancing procedure for the level set function
on general structured grids. The proposed algorithm is adapted
from a recent finite-element-based method and preserves the mass
by means of a localized mass correction. A salient feature of the
scheme is the absence of adjustable parameters. The algorithm is
tested in two and three spa- tial dimensions and compared with a
state-of-the-art PDE-based redistancing method using structured
Cartesian grids. Through the use of quantitative error measures
of interest in level set methods, we show that the overall
performance of the proposed geometric procedure is better than
state-of-the-art PDE- based reinitialization schemes. We also
show that the algorithm is well–suited for the highly–streched
curvilinear grids used in CFD simulations.

/pdf/a-mass-preserving-geometry-based-reinitialization-method-for-3hushukxk8.pdf

A Mass-Preserving Geometry-Based Reinitialization Method for the Level Set Function

Moving-least-squares (MLS) surfaces undergoing large deformations need periodic regeneration of the point set (point-set resampling) so as to keep the point-set density quasi-uniform. Previous work by the authors dealt with algebraic MLS surfaces, and proposed a resampling strategy based on defining the new points at the intersections of the MLS surface with a suitable set of rays. That strategy has very low memory requirements and is easy to parallelize. In this article new resampling strategies with reduced CPU-time cost are explored. The basic idea is to choose as set of rays the lines of a regular, Cartesian grid, and to fully exploit this grid: as data structure for search queries, as spatial structure for traversing the surface in a continuation-like algorithm, and also as approximation grid for an interpolated version of the MLS surface. It is shown that in this way a very simple and compact resampling technique is obtained, which cuts the resampling cost by half with affordable memory requirements.

Resampling strategies for deforming MLS surfaces

The study of bubble's behavior in turbulent flows is fundamental to the understanding of many engineering applications that are concerned with bubbly/two-phase flow. In turbomachinery, for example, tiny gas nuclei present in the liquid may grow to macroscopic size if the instantaneous pressure dips below the vapor pressure for a time long enough to incite cavitation events. In this paper, the Lagrangian pressure statistics of finite sized bubbles in homogeneous isotropic turbulence is investigated using highly-resolved direct numerical simulations of the Navier-Stokes equations at Reλ = 150. A modified Maxey-Riley equation is used for Lagrangian tracking of bubbles in the turbulence field. The Lagrangian pressure statistics (probability density function, frequency of low-pressure events and their duration) are analyzed as functions of the bubble size. The overall picture that emerges is consistent with finite-sized bubbles being driven towards vortex cores, resulting in an average pressure further below the mean value and longer and more frequent low-pressure events as the considered size is increased.

Effect of bubble size on Lagrangian pressure statistics in homogeneous isotropic turbulence

/pdf/chemoreception-and-chemotaxis-of-a-three-sphere-swimmer-2py2frhq.pdf

Chemoreception and chemotaxis of a three-sphere swimmer

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