Results 11 to 20 of about 103,759 (256)
IEEE Access, 2020 This paper proposes a bidirectional absorptive common-mode filter (A-CMF) for 5G “green” communication systems. The A-CMF is a balanced-to-balanced structure using interdigitated coupled lines to replace normal double parallel-coupled lines
Yangyang Guan +2 more
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Adaptive noise canceling for transient absorption microscopy [PDF]
Journal of Biomedical Optics, 2020 Ultrafast fiber lasers are an attractive alternative to bulk lasers for nonlinear optical microscopy for their compactness and low cost. The high relative intensity noise (RIN) of these lasers poses a challenge for pump-probe measurements such as transient absorption and stimulated Raman scattering, along with modalities that provide label-free ...
Wang, Erkang +2 more
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Research Progress on Sound Absorption of Electrospun Fibrous Composite Materials
Nanomaterials, 2022 Noise is considered severe environmental pollutant that affects human health. Using sound absorption materials to reduce noise is a way to decrease the hazards of noise pollution.
Xiuhong Li +5 more
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Effect of Thickness and Perforation Size on the Acoustic Absorption Performance of a Micro-Perforated Panel [PDF]
MATEC Web of Conferences, 2021 In current times, noise pollution is especially apparent in urban areas due to rapid development in transportation, industrialization, and urbanization.
Wong Yi-San +3 more
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Applied Sciences, 2023 The high level of noise in helicopter cabins considerably compromises the comfort and safety of the pilot and passengers. To verify the feasibility and effectiveness of microperforated panel composite sound absorption structures for noise suppression in ...
Chenglei Li +3 more
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Acoustic Metamaterials in Aeronautics
Applied Sciences, 2018 Metamaterials, man-made composites that are scaled smaller than the wavelength, have demonstrated a huge potential for application in acoustics, allowing the production of sub-wavelength acoustic absorbers, acoustic invisibility, perfect acoustic mirrors
Giorgio Palma +4 more
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IEEE Photonics Journal, 2021 We report a new method of accurately measuring the mid-infrared absorption of fluid analytes using on-chip waveguides that allows measurements to be referenced for noise and drift reduction whilst using only a single external detector.
Yanli Qi +10 more
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Journal of Natural Fibers, 2022 The effects of cross-sectional shape, fiber density, and porosity of flax, jute, okra, sisal, and wool fibrous assemblies on noise absorption coefficient have been investigated.
Mallika Datta +4 more
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The Absorption of Noise in Ventilating Ducts [PDF]
The Journal of the Acoustical Society of America, 1940 This paper describes an experimental study of noise in ventilating ducts and the quieting effect of a sound absorbing duct lining. The attenuation in decibels per foot length of duct was measured directly, using a loudspeaker as a sound source, for both lined and unlined rectangular ducts of various shapes and sizes, and for various frequencies.
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Aerospace, 2023 This paper presents the technological advancement of using friction powders to increase the absorption of acoustic liners used in the reduction of tonal noise generated by aero-engines or for other applications related to Helmholtz resonators used in ...
Constantin Sandu +3 more
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