We present the first direct measurement of the gravity-field curvature based on three conjugated atom interferometers. Three atomic clouds launched in the vertical direction are simultaneously interrogated by the same atom interferometry sequence and used to probe the gravity field at three equally spaced positions. The vertical component of the gravity-field curvature generated by nearby sourc...

This article describes and discusses a method to determine root curvature radius by using cone-beam computed tomography (CBCT). The severity of root canal curvature is essential to select instrument and instrumentation technique. The diagnosis and planning of root canal treatment have traditionally been made based on periapical radiography. However, the higher accuracy of CBCT images to identif...

This paper presents a quantitative analysis of the error of the edge angle measurement obtained from edge detector in the presence of grey level gaussian noise. Our analysis shows that the uncertainty of the angle measurement is only related to the grey level noise power and the gradient of the edge point at which the angle is measured. Both image independent upper bound and image dependent est...

The article presents a fiber-optic sensor based on singlemode-multimode-singlemode (SMS) structure for simultaneous measurement of strain and curvature. It is shown that the demodulation curvature can be realized using Fourier analysis recorded interference oscillations. Keywords: optical fiber sensors, intermode interference, single mode-multimode-single mode, stretching, bending.

We propose to characterize the shapes of flat pebbles in terms of the statistical distribution of curvatures measured along the pebble contour. This is demonstrated for the erosion of clay pebbles in a controlled laboratory apparatus. Photographs at various stages of erosion are analyzed, and compared with two models. We find that the curvature distribution complements the usual measurement of ...

ABSTRACT Inflation predicts that the Universe is spatially flat. The Planck 2018 measurements of cosmic microwave background anisotropy favour a closed universe at more than 2? confidence level. We use model-independent methods to study issue curvature. method reconstructs Hubble parameter H(z) from chronometers data with Gaussian process method. distance modulus then calculated reconstructed f...