There's no better time than now to embrace the majesty of the night sky to begin a lifelong journey with amateur astronomy that will have you exploring everything from twinkling stars and ...

Recently, in the hobby, there has been renewed interest in older Topps Chrome Refractors, specifically from the early 2000s. While some are more common to find, some can be tough pulls. A great ...

A phoropter is an instrument comprised of cylinders, prisms, and lenses that measures the eye’s refractive error to help determine and eye prescription. Phoroptors ...

Sir Isaac Newton once wrote, in what must be one of the most oft-quoted lines in the history of science, "If I have seen further it is by standing upon the shoulders of giants." Well, any of us who ...

Abstract: Charge sharing (CS) between pixels is a significant concern in X-ray spectroscopy detectors based on monolithic arrays of silicon drift detectors (SDDs) when a photon is absorbed near a ...

Abstract: Monolithic scintillators for positron emission tomography systems perform best when calibrated individually. We present a fan-beam collimator with which a crystal can be calibrated within ...

The demo contains raw data ( including images and text ) and MATLAB code. The raw collimator images is in the folder data/data1. In a .txt, the first two columns are 2D image points (x,y), and the ...