Results 31 to 40 of about 15,521,488 (377)

Three-Dimensional Ultrasonic Reverse-Time Migration Imaging of Submarine Pipeline Nondestructive Testing in Cylindrical Coordinates

open access: yesJournal of Marine Science and Engineering, 2023
Submarine pipelines are a safe and energy-efficient mode of gas transport. However, due to the complex manufacturing process and harsh operating environment, submarine pipelines are subject to fatigue cracks under long-term cyclic loading.
Daicheng Peng   +5 more
doaj   +1 more source

Large-scale retrospective relative spectro-photometric self-calibration in space [PDF]

open access: yes, 2017
We consider the application of relative self-calibration using overlap regions to spectroscopic galaxy surveys that use slit-less spectroscopy. This method is based on that developed for the SDSS by Padmanabhan at al.
Amiaux, Jerome   +9 more
core   +3 more sources

Heterogeneous Image Matching via a Novel Feature Describing Model

open access: yesApplied Sciences, 2019
Computer vision has been developed greatly in the past several years, and many useful and interesting technologies have been presented and widely applied. Image matching is an important technology based on similarity measurement.
Bin Zhou   +5 more
doaj   +1 more source

Can noncommutativity resolve the Big-Bang singularity? [PDF]

open access: yes, 2003
A possible way to resolve the singularities of general relativity is proposed based on the assumption that the description of space-time using commuting coordinates is not valid above a certain fundamental scale.
Dimakis   +12 more
core   +1 more source

Research on Fault Diagnosis of Rolling Bearing Based on Morlet Wavelet and Scale Space

open access: yes机车电传动, 2021
Aiming at the difficulty of extracting the early fault features of rolling bearings, a rolling bearing fault diagnosis method based on Morlet wavelet and scale space was proposed.
Maohui WANG   +3 more
doaj  

Partial Block Scheme and Adaptive Update Model for Kernelized Correlation Filters-Based Object Tracking

open access: yesApplied Sciences, 2018
In visual object tracking, the dynamic environment is a challenging issue. Partial occlusion and scale variation are typical challenging problems. We present a correlation-based object tracking based on the discriminative model.
Soowoong Jeong, Joonki Paik
doaj   +1 more source

Considerations and Framework for Foveated Imaging Systems †

open access: yesPhotonics, 2018
Foveated sight as observed in some raptor eyes is a motivation for artificial imaging systems requiring both wide fields of view as well as specific embedded regions of higher resolution.
Ram M. Narayanan   +3 more
doaj   +1 more source

Gauging Newton's Law

open access: yes, 2003
We derive both Lagrangian and Hamiltonian mechanics as gauge theories of Newtonian mechanics. Systematic development of the distinct symmetries of dynamics and measurement suggest that gauge theory may be motivated as a reconciliation of dynamics with ...
Anderson   +7 more
core   +1 more source

An Adaptive Method for Star Extraction from Digital Astronomical Images [PDF]

open access: yesفصلنامه علوم و فناوری فضایی, 2010
Celestial positioning has been used for navigation purposes for many years. Stars as the extra-terrestrial benchmarks provide unique opportunity in absolute point positioning.
M. A. Sharifi   +2 more
doaj  

A compactness result for non-local unregularized gradient flow lines [PDF]

open access: yes, 2018
We prove an abstract compactness result for gradient flow lines of a non-local unregularized gradient flow equation on a scale Hilbert space.
Albers, Peter   +2 more
core   +2 more sources

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