Results 31 to 40 of about 13,142 (151)

UAVs for Hydrologic Scopes: Application of a Low-Cost UAV to Estimate Surface Water Velocity by Using Three Different Image-Based Methods

Drones, 2019
Stream velocity and flow are very important parameters that must be measured accurately to develop effective water resource management plans. There are various methods and tools to measure the velocity but, nowadays, image-based methods are a promising ...
Paschalis Koutalakis, Ourania Tzoraki, George Zaimes   +2 more
doaj   +1 more source

Squids use multiple escape jet patterns throughout ontogeny

Biology Open, 2020
Throughout their lives, squids are both predators and prey for a multitude of animals, many of which are at the top of ocean food webs, making them an integral component of the trophic structure of marine ecosystems.
Carly A. York, Ian K. Bartol, Paul S. Krueger, Joseph T. Thompson   +3 more
doaj   +1 more source

High-accuracy transverse translation velocimeter enabled by OAM-assisted dual-point transverse Doppler effect

APL Photonics, 2023
Laser Doppler velocimetry has developed as a powerful enabling technology within a myriad of realistic scenarios. While existing toolkits that exploit optical vortex allow access to longitudinal linear velocimetry and/or transverse rotational velocimetry
Yanxiang Zhang, Zijing Zhang, Qingfeng Wang, Yuan Zhao   +3 more
doaj   +1 more source

Particle image velocimetry technique for analysis of retractibility in woods of Pinus elliottii

Maderas: Ciencia y Tecnología, 2021
The aim of this work was to verify the ability to use the Particle Image Velocimetry technique for measurements of dimensional variations resulting from wood retractability of Pinus elliottii wood, initially saturated and with the surface marked with ...
Eduardo Hélio de Novais Miranda, Rayner Pathele Ferreira, Rodrigo Allan Pereira, Taiane Oliveira Guedes, Fernando Pujaico Rivera   +4 more
doaj   +1 more source

Particle image velocimetry technique and ultrasound method to obtain the modulus of elasticity of Bertholletia excelsa wood

Maderas: Ciencia y Tecnología, 2021
Non-destructive techniques for characterizing materials in-service have been increasing in importance. Thus, it is relevant to assess the potential of non-destructive techniques for solid materials. This work aimed to determine the modulus of elasticity
Eduardo Hélio de Novais Miranda, Rayner Pathele Ferreira, Rodrigo Allan Pereira, Taiane Oliveira Guedes, Fernando Pujaico Rivera, Diogo Antonio Correa Gomes   +5 more
doaj   +1 more source

Effect of Dispersed Particle Concentration on Photoacoustic Flowmetry Using Low-Frequency Transducers

Metrology
Photoacoustic (PA) velocimetry offers a promising solution to the limitations of conventional techniques for measuring blood flow velocity. Given its moderate penetration depth and high spatial resolution, PA imaging is considered suitable for measuring ...
Haruka Tsuboi, Taichi Kaizuka, Katsuaki Shirai   +2 more
doaj   +1 more source

A novel imaging technique to evaluate airflow characteristics in the upper airway of an obstructive sleep apnea patient

Clinical Case Reports, 2017
Key Clinical Message We report about a novel imaging technique for airflow analysis, particle image velocimetry (PIV), used in a moderate obstructive sleep apnea (OSA) patient.
Hui Chen, Ghizlane Aarab, Jian‐wei Liu, Yong‐liang Yu, Jing Guo, Paul F. van derStelt, Frank Lobbezoo   +6 more
doaj   +1 more source

Application of High-Speed Self-Aligned Focusing Schlieren System for Supersonic Flow Velocimetry

Aerospace
A self-aligned focusing schlieren (SAFS) system combines the field of view of a conventional schlieren system with the defocus blur of a focusing schlieren system away from the object plane.
Philip A. Lax, Sergey B. Leonov
doaj   +1 more source

Realization of Multitone Continuous Wave Lidar

IEEE Photonics Journal, 2019
We have developed a multitone modulated continuous wave (MTCW) Lidar system made of a CW laser with multiple fixed RF tones for a high precision range finding and velocimetry.
Rasul Torun, Mustafa M. Bayer, Imam U. Zaman, Jose E. Velazco, Ozdal Boyraz   +4 more
doaj   +1 more source

Controlling Polystyrene Particle Distribution in Colloidal Lithography For Correlated‐Disorder Structures

Advanced Optical Materials, EarlyView.
Colloidal lithography is a low‐cost, simple and scalable technique to fabricate correlated‐disorder nanostructures for light‐trapping in solar cells. This work investigates the control of polystyrene particle distribution in colloidal lithography, highlighting the importance of particle surface functionalization as well as the ability to tune the ...
Laura de Almeida, Jean‐Baptiste Doucet, Mathieu Arribat, Guilhem Almuneau, Stéphane Collin, Inès Revol   +5 more
wiley   +1 more source