Results 81 to 90 of about 1,550,252 (358)

Study of Low-Frequency Sound Absorption Based on Negative Stiffness Membrane Structure

Symmetry, 2022
The system stiffness of a negative stiffness membrane structure is widely investigated in metamaterial research, and some special performances have been achieved. While for acoustics, low-frequency absorption still remains a big issue, so in this work, a
Xiaoyuan Zheng, Chenxu Fu, H. Bai, Zhu Lin, Xingxing Liu   +4 more
semanticscholar   +1 more source

Acoustic Absorption Coefficients at High Frequencies [PDF]

The Journal of the Acoustical Society of America, 1949
The measurement of the acoustic absorption coefficient by a steady state method was carried out at frequencies of 9, 20, and 30 kc for seven different materials. This involved the construction of a sound chamber with facilities for creating a diffuse sound field and a sample area where materials could be mounted.
openaire   +2 more sources

Classical wave experiments on chaotic scattering

, 2005
We review recent research on the transport properties of classical waves through chaotic systems with special emphasis on microwaves and sound waves. Inasmuch as these experiments use antennas or transducers to couple waves into or out of the systems ...
Berry M V, Berry M V, Blatt J M, Casati G, Cotoni V, Davy J, Davy J L, Davy J L, Ebeling K J, Ebeling K J, Fano U, Fyodorov Y V, Genack A Z, Gorin T, Gorin T Seligman T H Weaver R L, Graff K F, Gutzwiller M C, H-J Stöckmann, Hemmady S Zheng X Antonsen T M Ott E Anlage S M, Hul O, Jalabert R A, Kim Y H, Kino G S, Kuhl U Höhmann R Main J Stöckmann H J, Kutruff H, Mahaux C, Miller W H, Porter C E, R Weaver, Richter A, Rollwage M, Rotter S Kuhl U Libisch F Burgdoerfer J Stöckmann H J, Saichev A I, Savin D V, Schardt P, Schroeder M, Schroeder M R, Schäfer R, Schäfer R, Sommers H J, Stöckmann H J, Stöckmann H J, Teitsworth S W Reguera D Platero G Bonilla L L Rubi J M, U Kuhl, Urbina J D, Zheng X Hemmady S T M A Anlage S M Ott E, Šeba P   +46 more
core   +1 more source

Modelling and directionally encoding the acoustics of a room [PDF]

, 1998
Geometrical methods are often used to model the acoustic properties of a room, but are valid only for high frequencies. At low frequencies. diffraction and the effects of room modes cannot be neglected.
Howard, D M, Murphy, D T
core   +1 more source

Quantum Emitters in Hexagonal Boron Nitride: Principles, Engineering and Applications

Advanced Functional Materials, EarlyView.
Quantum emitters in hexagonal boron nitride have emerged as a promising candidate for quantum information science. This review examines the fundamentals of these quantum emitters, including their level structures, defect engineering, and their possible chemical structures.
Thi Ngoc Anh Mai, Md Shakhawath Hossain, Nhat Minh Nguyen, Yongliang Chen, Chaohao Chen, Xiaoxue Xu, Quang Thang Trinh, Toan Dinh, Toan Trong Tran   +8 more
wiley   +1 more source

Study of noise absorption characteristics for current building materials applied in industrial and office rooms

Muhandisī-i bihdāsht-i ḥirfah/ī, 2016
Introduction: In Iran country, there is a lack of reliable data on acoustic characteristics of building materials applied in the offices and industrial rooms.
Mohsen Aliabadi, Rostam Golmohammadi, Mohammad Oliae, Reza Shahidi   +3 more
doaj  

Development of non-woven from recycled fabric selvedge wastes for functional sound absorption

International Journal of Sustainable Engineering, 2022
Reasons for recycling of waste include conservation of resources, reduction in the need for landfills, paying associated tipping fees and provision of low-cost raw materials for products.
Temesggen Feleke Fera, Yerdaw Zeleke, Yohannes Girmay   +2 more
doaj   +1 more source

Acoustic modeling using the digital waveguide mesh [PDF]

, 2007
The digital waveguide mesh has been an active area of music acoustics research for over ten years. Although founded in 1-D digital waveguide modeling, the principles on which it is based are not new to researchers grounded in numerical simulation, FDTD ...
Kelloniemi, Antti, Mullen, Jack, Murphy, Damian, Shelley, Simon   +3 more
core   +2 more sources

Photoactivation of NV Centers in Diamond via Continuous Wave Laser Illumination of Shallow As‐Implanted Nitrogen

Advanced Functional Materials, EarlyView.
This study demonstrates an alternative method of creating charge‐stable negatively charged nitrogen vacancy (NV−) centers close to the diamond surface without high‐temperature annealing. By illuminating nitrogen‐implanted regions with a continuous‐wave 405 nm laser, NV− centers are induced, exhibiting electron spin coherence properties suitable for ...
Jens Fuhrmann, Christoph Findler, Michael Olney‐Fraser, Lev Kazak, Fedor Jelezko   +4 more
wiley   +1 more source

Comparison of the room’s dimension and absorption distribution estimation performance using wave-based and geometrical acoustics dataset [PDF]

, 2022
Yifan Xia, Zheng Guo, Cheol–Heon Jeong
openalex   +1 more source