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Digitally Printed Eco‐Friendly Electronic Devices

Advanced Functional Materials, EarlyView.
Fabrication of electronics using eco‐friendly materials through digital printing routes is a promising strategy for improving life cycle sustainability and reducing the environmental impacts of conventional manufacturing. This review highlights state‐of‐the‐art eco‐friendly materials, green ink formulations, various resource‐efficient digital printing ...
Nitheesh M. Nair, Mikel Rincón‐Iglesias, Cristian Mendes‐Felipe, Fatemeh Etehadi, Senentxu Lanceros‐Méndez, Gerardo Hernandez‐Sosa   +5 more
wiley   +1 more source

Integrated Multiband Smart Windows From UV to LWIR Based on Molecularly Engineered Thermochromic Hydrogels

Advanced Functional Materials, EarlyView.
A multiband smart window integrating a thermochromic poly (EEEA‐co‐NIPAM) hydrogel with functional layers, enabling dynamic VIS‐NIR solar modulation alongside UV shielding and low LWIR emissivity. The polymer network forms hydrogen‐bonding interactions, promoting chain collapse above a reduced lower critical solution temperature, and accelerating the ...
Jiashuo Sun, Yutong Tan, Congyuan Wei, Zhenhui Hu, Rui Zhu, Yu Zhao, Yueyue Guan, Ruifeng Zhang, Hengshan Wei, Ran Tao, Wang Zhang, Jingting Luo, Guofa Cai, Xi Chen, Yi Long, Yongsheng Yang, Jinqing Peng, Yujie Ke   +17 more
wiley   +1 more source

Air-Coupled Ultrasonic Measurements in Composites [PDF]

AIP Conference Proceedings, 2004
Air‐coupled ultrasound is a non‐contact technique and has clear advantages over water‐coupled testing. Research of air‐coupled ultrasonics, especially using capacitance and micromachined transducers, has been extensively reported in the literature. This paper reports our experience of applying piezoceramic air‐coupled transducers for nondestructive ...
Kommareddy, Vamshi
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Review of Air-Coupled Ultrasonic Materials Characterization

Ultrasonics, 2014
This article presents a review of air-coupled ultrasonics employed in the characterization or nondestructive inspection of industrial materials. Developments in air-coupled transduction and electronics are briefly treated, although the emphasis here is on methods of characterization and inspection, and in overcoming limitations inherent in the use of ...
D E Chimenti
exaly   +3 more sources

Characterization of air-coupled transducers

IEEE Transactions on Ultrasonics, Ferroelectrics and Frequency Control, 1996
This paper describes a theoretical and experimental study for determination of the through-air system impulse response and insertion loss with different air-coupled ultrasonic transducers. Wide-band piezopolymer transducers (PVDF) are employed in both transmission and reception modes and their behavior assessed by means of mathematical modeling and ...
Gachagan, Anthony, Hayward, Gordon, SP, Kelly, Galbraith, Walter   +3 more
openaire   +3 more sources

Wideband characterisation of air coupled transducers

Proceedings of IEEE Ultrasonics Symposium ULTSYM-94, 1994
This paper describes a theoretical and experimental study on the use of wideband piezopolymer transducers (PVDF) for the determination of the through-air system impulse response, in both transmission and reception. A linear systems model was used to design a PVDF transmitter/receiver possessing a unipolar, planar and wideband impulse response for ...
Gachagan, Anthony, Galbraith, Walter, Hayward, Gordon   +2 more
openaire   +3 more sources

Air-coupled Lamb wave tomography

IEEE Transactions on Ultrasonics, Ferroelectrics and Frequency Control, 1997
An entirely air-coupled inspection system using a pair of micromachined silicon capacitance transducers has been used to image defects in thin plates of different materials (0.7 mm to 2.22 mm thick) using air-coupled Lamb wave tomography. A filtered back projection algorithm was used in a form of difference tomography to reconstruct images of defects ...
W, Wright, D, Hutchins, D, Jansen, D, Schindel   +3 more
openaire   +2 more sources

Progress in air-coupled ultrasound

SPIE Proceedings, 2007
A variety of industrial and everyday non-destructive inspection applications exist where the target material/product is inaccessible or, contact with the material is prohibited. In such cases, air-coupled ultrasonic techniques play a major role but commonly significant transmission loss is known to occur.
Subash Jayaraman, Dominik Pellkofer, Ian Lucas, Michal Bezdek, Bernhard Tittmann   +4 more
openaire   +1 more source

Air-Coupled Ultrasonics

2011
Ultrasonic material characterization or inspection for defects is conventionally performed using either liquid coupling (water, usually) or some type of gel or oil in contact-mode coupling. Mechanical waves can be transmitted only through some sound-supporting medium from their source (a transducer) to the object under study, and back again.
Dale Chimenti, Stanislav Rokhlin, Peter Nagy   +2 more
openaire   +1 more source

Gas jet as a waveguide for air-coupled ultrasound

Ultrasonics, 2002
The directional characteristics of an ultrasonic signal have been studied during propagation within an axial gas jet. The effects of nozzle shape, nozzle diameter, and variations in jet velocity, temperature and gas composition have been investigated. At high flow velocities of an air jet, divergence of the ultrasonic beam was observed.
D W, Choi, C, McIntyre, D A, Hutchins, D R, Billson   +3 more
openaire   +2 more sources