The aim of this study was to investigate the in vitro activities of polymyxin B (PB) and rifampin (RIF) in combination with ampicillin/sulbactam (AS) or cefoperazone/sulbactam (CS) against 20 multidrug-resistant Acinetobacter baumannii (MDR-AB) isolates by the checkerboard and E-test methods. Fractional inhibitory concentration index (FICI) values were defined as synergy, FICI ≤ 0.5; additivity...

This study investigated the effects of the stimulus size on the spatial frequency tuning of the Ouchi illusion, which is an illusory sliding motion perceived in a checkerboard pattern of rectangular elements that is surrounded by a checkerboard pattern of orthogonally oriented elements. Two experiments were conducted to measure the perceived strength of illusion. The optimal size of the inner p...

Abstract. An unphysical checkerboard pattern is identified in E3SMv2 and E3SM-MMF that detectable across a wide range of timescales, from instantaneous snapshots to multi-year averages. A detection method developed quantify characteristics the signal by cataloguing all possible configurations eight adjacent neighbors for each cell on model's cubed sphere grid using daily mean data. The only fou...

Tiling pervades the art and architecture of various ancient civilizations. Toddlers grapple with tiling problems when they pack away their wooden blocks and home renovators encounter similar problems in the bathroom. However, rather than being a frivolous pastime, mathematicians have found the art of tiling to be brimming with beautiful mathematics, problems of fiendish difficulty, as well as i...

An in vitro method of detecting synergy which is simple to perform, accurate, and reproducible and has the potential for clinical extrapolation is desirable. Time-kill and checkerboard methods are the most widely used techniques to assess synergy but are time-consuming and labor-intensive. The Epsilometer test (E test), a less technically demanding test, has not been well studied for synergy te...

1. Abstract Traditionally, standard Lagrangian-type finite elements, such as linear quads and triangles, have been the elements of choice in the field of topology optimization. In general, finite element meshes with these elements exhibit the well-known checkerboard pathology in the iterative solution of topology optimization problems. Voronoi and Wachspress-type finite elements are less suscep...