Jonathan Knight

Abstract Laser Powder Bed Fusion (LPBF) can be used to create metal parts with pockets of retained, unfused powder that serve as mechanical dampers. These trapped-powder dampers show promise for reducing the amplitude of vibrations at resonance by orders of magnitude. However, little is currently understood about the nonlinearity and repeatability of trapped-powder dampers, meaning that the design process currently consists of expensive trial-and-error prototyping and iteration.

1 Introduction Ultraviolet and visible (UV/Vis) wavelengths of light are widely used in a range of fields, including photolithography [1], microscopy [2] and environmental sensing [3, 4]. Their utility stems from the higher energy and shorter wavelengths than the near-infrared, enabling stronger light–matter interactions over smaller scales.

A look at key findings from the ISEA & J. J. Keller collaborative study. By: Jonathan Knight, Contributor This article first appeared on the National Association of Safety Professionals Website1 The latest joint study by J. J. Keller & Associates, Inc. and the International Safety Equipment Association (ISEA) reveals that head protection practices, while improving, still face challenges that put workers at risk.