Results 81 to 90 of about 313,410 (304)

Sound Absorption Capability and Anatomical Features of Highly Sound Absorptive Wood

Journal of the Korean Wood Science and Technology, 2010
일본산 산공재 중 구조적 특징이 목재흡음에 적합하다고 사료되는 카기카즈라목재의 흡음성능과 구조적 특징을 관찰하고자 목재횡단방향으로 원반형시험편을 채취하여 구조적 특징을 관찰하고, 전달함수법으로 흡음율을 측정하였다. 측정주파수범위에서 카기카즈라 횡단면의 흡음율은 0.30에서 0.50의 수치를 나타내었다. 비교수종인 낙엽송시험편보다 2∼3배 높은 흡음율을 나타내었으며, 특히 2∼4 KHz의 주파수영역에서는 50% 전후로 높은 흡음율을 나타내었다. 카기카즈라목재의 횡단면에서는 다수의 커다란 도관이 존재하고 이들 도관요소들은 단일천공판으로 연결되어 다공질형흡음에 유용한 연속된 모세관이 다량 존재하는 사실을 확인할 수 있었다.
Chun-Won Kang, Wook Kang, Gwang-Chul Kim
openaire   +2 more sources

Transducers Across Scales and Frequencies: A System‐Level Framework for Multiphysics Integration and Co‐Design

Advanced Materials Technologies, EarlyView.
Transducers convert physical signals into electrical and optical representations, yet each mechanism is bounded by intrinsic trade‐offs across bandwidth, sensitivity, speed, and energy. This review maps transduction mechanisms across physical scale and frequency, showing how heterogeneous integration and multiphysics co‐design transform isolated ...
Aolei Xu, Mengyao Xiao, Zhouli Sui, Yinpeng Wang, Daoye Zheng, Yuxin Liu, Luwei Wang, Huajun Liu, Chengkuo Lee   +8 more
wiley   +1 more source

Fiber Weight Fraction Effect to Acoustic Properties of RHDPE Cantula Composite

Mekanika, 2017
In this study, composites made from recycled HDPE and Cantula fiber have been done and the absorption coefficient have been measured. Composites rHDPE-Cantula were made using hot press for approximately 60 minutes with 170oC temperature while pressure ...
Muhammad Taufik Burhany Hendrowarsito, Wijang Wisnu Raharjo, Dwi Aries Himawanto   +2 more
doaj   +1 more source

Sound and Heat Absorption by a 2D Electron Gas in an Odd-Integer Quantized-Hall Regime

, 1999
The absorption of bulk acoustic phonons in a two-dimensional (2D) GaAs/AlGaAs heterostructure is studied (in the clean limit) where the 2D electron-gas (2DEG), being in an odd-integer quantum-Hall state, is in fact a spin dielectric.
A. B. Dzyubenko, A. Bartels, A. Esslinger, A. J. Kent, A. Knäbchen, A. V. Akimov, A. Wixforth, A. Wixforth, C. Kallin, D. G. Polyakov, H. A. Fertig, I. Kukushkin, I. L. Aleiner, I. P. Eisenstein, I. S. Gradshteyn, I. V. Lerner, L. Brey, L. D. Landau, L. E. Golub, L. J. Challis, M. I. D’yakonov, M. Rasolt, O. Weis, R. L. Willett, R. L. Willett, S. Dickmann, S. E. Barret, S. Iordanskii, S. L. Sondhi, S. M. Dickmann, S. V. Iordanskii, S. V. Iordanskii, V. F. Gantmakher, V. W. Rampton, Yu. A. Bychkov, Yu. A. Bychkov, Yu. A. Bychkov, Yu. A. Bychkov, Yu. A. Bychkov   +38 more
core   +1 more source

Fabric‐Based Wearable Robotic Exoskeleton Gloves: Advancements and Challenges

Advanced Materials Technologies, EarlyView.
This review highlights interdisciplinary technological advances in fabric‐based robotic gloves, focusing on progress in design, fabrication, actuation, sensing, control, and power and energy requirements. It also addresses performance testing and validation, including biomechanical, strength, functional, user experience, and durability assessments, to ...
Ayse Feyza Yilmaz, Gökhan Ince, Ozgur Atalay   +2 more
wiley   +1 more source

Improving Sound Absorption Property of Polyurethane Foams by Adding Tea-Leaf Fibers

Archives of Acoustics, 2013
The sound absorption property of polyurethane (PU) foams loaded with natural tea-leaf fibers and luffa cylindrica (LC) has been studied. The results show a significant improvement in the sound absorption property parallel to an increase in the amount ...
Bulent EKICI, Aykut KENTLI, Haluk KUCUK
doaj  

Atmospheric Propagation [PDF]

Reviewed here is the current state of knowledge with respect to each basic mechanism of sound propagation in the atmosphere and how each mechanism changes the spectral or temporal characteristics of the sound received at a distance from the source.
Daigle, Gilles A., Embleton, Tony F. W.
core   +1 more source

Adaptive Carbon Nanotube Patches for Versatile Electronic Textiles and Wind‐Harvesting Applications

Advanced Materials Technologies, EarlyView.
An adhesion‐tunable electronic textile patch based on a carbon nanotube/paraffin composite is presented, enabling direct, adhesive‐free integration with fabrics. Pressure‐responsive bonding allows reversible or permanent attachment on demand.
Seokwon Joo, Yang‐Hu Park, Da‐Seul Kim, Ju‐Hyung Kim, Yoon‐Kyu Song   +4 more
wiley   +1 more source

Study on the sound absorption characteristics and noise reduction mechanism of coconut-shell-activated carbon particles and coconut fiber composite biomass sound-absorption materials

Materials Research Express
Sound-absorbing materials are widely used in the field of automotive industry. Biomass materials are abundant in the nature, some of which have natural sound absorption and noise reduction properties.
Zhenhua Hou, Xiaoying Ma, Liai Pan, Rui Zhang, Libo Wang   +4 more
doaj   +1 more source

Effects of fiber motion on the acoustic behavior of an anisotropic, flexible fibrous material [PDF]

The acoustic behavior of a flexible fibrous material was studied experimentally. The material consisted of cylindrically shaped fibers arranged in a batting with the fibers primarily aligned parallel to the face of the batting.
Dahl, Milo D., Groesbeck, Donald E., Rice, Edward J.   +2 more
core   +1 more source