Results 1 to 10 of about 128,247 (281)

Expanding the PIV Spectral Range and the Turbulence Generated by Grid of Prismatic Circular Cylinders [PDF]

open access: yesMATEC Web of Conferences, 2022
The grid turbulence past a grid made of row of prismatic circular rods (rod diameter = 10 mm, rod spacing = 20 mm) perpendicular to the flow is observed by using a pair of PIV cameras.
Duda Daniel   +2 more
doaj   +1 more source

An optimal energy management strategy for a photovoltaic/li-ion battery power system for DC microgrid application

open access: yesFrontiers in Energy Research, 2023
The purpose of this paper is to propose an energy management strategy (EMS) based on flatness control method for a standalone hybrid photovoltaic-battery system. The goal of the proposed method is to use non-linear flatness theory to develop an efficient
Salam J. Yaqoob   +7 more
doaj   +1 more source

Improving Etched Flatness by Micro Airflow Array Pressurization in ITO Glass Laser Machining

open access: yesMicromachines, 2023
In laser etching of ITO glass, the warpage due to workpiece positioning causes breakpoint or deformation of micron-scale etching circuits. Based on traditional laser etching, a micro-airflow array pressurization is proposed by using a micro-flow air ...
Rong Chen, Zhaojie Chen, Jin Xie
doaj   +1 more source

A Method for Rapid Measurement of the Deformation and Spatial Attitude of Large Radar Antennas Inside Radomes

open access: yesIEEE Access, 2021
It is challenging to measure, analyze, and control the deformation and space attitude of antennas in narrow radomes through geometric measurement to ensure the accuracy of phased array radar application. In this manuscript, a method for rapid measurement
Xiao Guan, Yaming Xu, Cheng Xing
doaj   +1 more source

Flatness-Based Aggressive Formation Tracking Control of Quadrotors with Finite-Time Estimated Feedforwards

open access: yesApplied Sciences, 2021
In this paper we address a decentralized neighbor-based formation tracking control of multiple quadrotors with leader–follower structure. Different from most of the existing work, the formation tracking controller is given in one loop without ...
Zhicheng Hou   +4 more
doaj   +1 more source

3D scan contour de-featuring for improved measurement accuracy – a case study for a small turbine guide vane component [PDF]

open access: yesBulletin of the Polish Academy of Sciences: Technical Sciences, 2021
3D scanning measurements are gaining popularity every year. Quick inspections on already captured point clouds are easy to prepare with the use of modern software and machine learning.
Marcin Jamontt, Paweł Pyrzanowski
doaj   +1 more source

Flatness of the Meckel cave may cause primary trigeminal neuralgia: a radiomics-based study

open access: yesThe Journal of Headache and Pain, 2021
Background Neurovascular contact (NVC) is the main cause of primary trigeminal neuralgia (PTN); however, cases of PTN without NVC are still observed. In this study, the Meckel cave (MC) morphology in PTN were analyzed by radiomics and compared to healthy
Jinzhi Lin   +4 more
doaj   +1 more source

Reconstruction of small components using photogrammetry: a quantitative analysis of the depth of field influence using a miniature step gauge [PDF]

open access: yesMetrology and Measurement Systems, 2021
In this work, authors investigated the effect of the Depth of Field (DoF) reduction, arising when the acquisition of small objects is carried out with a photogrammetry-based system using a Digital Single Lens Reflex (DSLR) camera and the structure from ...
Maria Grazia Guerra   +3 more
doaj   +1 more source

Solving the Flatness and Quasi-flatness Problems in Brans-Dicke Cosmologies with a Varying Light Speed [PDF]

open access: yes, 1999
We define the flatness and quasi-flatness problems in cosmological models. We seek solutions to both problems in homogeneous and isotropic Brans-Dicke cosmologies with varying speed of light.
  +19 more
core   +2 more sources

Flatness pattern recognition of ultra-wide tandem cold rolling mill

open access: yes工程科学学报, 2021
A cubic flatness pattern expressed by Legendre orthogonal polynomial was introduced to build a new flatness pattern recognition model,in which least squares regression was used.
BAO Ren-ren   +5 more
doaj   +1 more source

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