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Depending on the micromechanical properties of its components and submitted to a vibrational excitation, a 2D set of spherical particles can exhibit the whole range of behaviour of common dry particulates such as sand : Spontaneous heaping, size segregation , convection, surface fluidisation etc. Modelling sand with a 2D set of particles has the crucial advantage of allowing a direct observation of...
Summary We review recent work characterizing force fluctuations and transmission in dense granular materials. These forces are carried preferentially on filimentary structures known as force chains. When a system is deformed, these chains tend to resist further deformation; with continued deformation, chains break and rearrange, leading to large spatio-temporal fluctuations. We first consider experiments...
Accurate and consistent ego motion estimation is a critical component of autonomous navigation. For this task, the combination of visual and inertial sensors is an inexpensive, compact, and complementary hardware suite that can be used on many types of vehicles. In this work, we compare two modern approaches to ego motion estimation: the Multi-State Constraint Kalman Filter (MSCKF) and the Sliding...
This novel design represents a broadly applicable three-dimensional technique for fabricating an “organ-on-a-chip” that serves as a viable platform for tissue studies. Current methods of biological research rely on animal testing and two-dimensional tissue cultures, but fail to provide physiologically accurate models of human tissue. This demonstrates a pressing need for convenient, physiologically...
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