Topic
Absorbing element
About: Absorbing element is a research topic. Over the lifetime, 294 publications have been published within this topic receiving 1329 citations. The topic is also known as: annihilating element & zero-element.
Papers published on a yearly basis
Papers
TL;DR: In this paper, a wave-shaped EMW absorbing element was fabricated using 3D cementitious printing technology, and the experimental reflectivity was also simulated by the finite element method, which agrees with the experimental results.
Abstract: Electromagnetic wave (EMW) pollution impairs the performance of equipment, facilities, information security, and human health. Ordinary, plain cementitious composite has limited EMW-reflecting capacity. To correct this, a macrostructure EMW absorbing element has been developed to reduce EMW pollution. As conventional casting of macrostructures is not cost-effective and lacks quality because of the demand for special formwork, 3D printing technology offers greater design flexibility, higher efficiency, and improved mechanical properties. Moreover, the surface texture of 3D-printed material exhibits natural corrugation to enhance EMW reflection further. In this study, novel wave-shaped EMW absorbing elements were fabricated using 3D cementitious printing technology. The EMW absorbing performance was analyzed by the naval research laboratory (NRL) system in the range of 1 GHz–18 GHz. Significant improvement of reflectivity was observed, especially in the low-frequency range. The optimum configuration was identified through effectiveness evaluation to be a K3 sample with 45 mm of heave height and 2/3 tan(θ), exhibiting a minimum reflectivity −43.7 dB, mean reflectivity −25 dB, and an absorbing bandwidth of 18 GHz. The experimental reflectivity was also simulated by the finite element method, which agrees with the experimental results. The synthetic vector electromagnetic field distribution was also studied to explore space impedance characteristics. Moreover, the finite element method attempted to correct drawbacks in experiments, including multiple direction reflection measurement and wave-number interruption. Based on simulation calibration, the influence of wave-shaped parameters (heave height and tangent value) upon EMW absorbing capacity was induced accurately.
54 citations
Patent•
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15 Jan 1988
TL;DR: In this paper, the primary energy absorbing element is a piece of elastomeric resilient material which contains a core (or cores) of a substantially incompressible, highly efficient dampening material.
Abstract: A device for absorbing the energy of vibration of one of two abutting members which has begun to vibrate due to forces applied to either of the two abutting members, so as to reduce the frequency and magnitude of vibration of one of the two abutting members. The primary energy absorbing element is a piece of elastomeric resilient material which contains a core (or cores) of a substantially incompressible, highly efficient dampening material; the presence or absence of this core of highly efficient dampening material will depend upon desired device stiffness and dampening characteristics. The primary energy absorbing element is surrounded by a flexible reinforced shell which contains and restrains said element, yet allows said element to deform in the transverse and vertical directions. Two end pieces or mounting plates are secured to opposite ends of the primary energy absorbing element.
47 citations
TL;DR: In this paper, the authors considered restricted distributivity of a continuous nullnorm with respect to a continuous t-conorm, and some applications of the obtained results in utility theory.
41 citations
TL;DR: In this paper, a sound-absorbing element of films has adjacent, cup-shaped recesses in the shape of a grid, where the bottom surfaces of the cup-like recesses are subdivided into bases by one or more crimp-shaped bases, each of which is appreciably smaller than the depth of the other bases.
Abstract: A sound-absorbing element of films has adjacent, cup-shaped recesses in theorm of a grid. The bottom surfaces of the films which are to be exposed to the sound field may be excited into dissipative vibrations when sound is incident thereon. The upper edges of the cup-shaped recesses are jointly covered by another flat material web. The bottom surfaces of the cup-shaped recesses are subdivided into bases by one or more crimp-shaped recesses, the depth of which is appreciably smaller than the depth of the cup-shaped recesses. The sound-absorbing element may be used in building, underground and tunnel construction and in vehicle construction.
37 citations
Patent•
4 Jan 2002
TL;DR: In this article, a light source absorbing device is used to absorb light source to generate electric power output required by a load, and the absorbing element is foldable for housing inside a casing to facilitate carrying outdoors for use.
Abstract: A backup power supply apparatus includes at a light source absorbing device which consists of at least one light source absorbing element. The light source absorbing element is pivotally engaged with each other and is foldable for housing inside a casing to facilitate carrying outdoors for use. The light source absorbing element may be unfolded to absorb light source to generate electric power output required by a load.
30 citations
Related Topics (5)
Performance Metrics
| Year | Papers |
|---|---|
| 2020 | 6 |
| 2019 | 11 |
| 2018 | 10 |
| 2017 | 8 |
| 2016 | 9 |
| 2015 | 7 |