Results 1 to 10 of about 109,970 (304)
Longitudinal impedance of two-layer tube [PDF]
Physical Review Special Topics. Accelerators and Beams, 2004 The exact analytical expression for the longitudinal impedance of two-layer cylindrical tube with finite wall thickness is obtained. The numerical results for the copper-NEG, stainless steel-copper, and ceramic-copper laminated vacuum chamber impedances ...
M. Ivanyan, V. Tsakanov
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Multilayer tube impedance and external radiation [PDF]
Physical Review Special Topics. Accelerators and Beams, 2008 The paper describes a method for calculating the longitudinal and transverse impedances of the laminated round pipe with many layers of different materials. The charge is moving along the pipe axis with arbitrary constant velocity.
M. Ivanyan +5 more
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Resistive-wall impedance of two-layer tube [PDF]
Physical Review Special Topics. Accelerators and Beams, 2007 In contrast to electron machines, beam particles travel in most proton or heavy ion circular accelerators with nonrelativistic speed. The resistive-wall impedance of the cylindrical two-layer tube with finite thickness is studied in this paper for any ...
N. Wang, Q. Qin
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Bayesian estimations of dissipation, sound speed, and microphone positions in impedance tubes [PDF]
JASA Express Letters, 2022 Sound speed, microphone positions, and tube wall dissipation are critical parameters for absorption and impedance measurements using the transfer-function method in an impedance tube. This work applies a Bayesian method, based on a reflection coefficient
Ziqi Chen +2 more
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Study on the impedance characteristics of a high-capacity pulse tube cryocooler
Energy Reports, 2022 Stirling-type pulse tube cryocoolers are used in many applications such as military facilities, aerospace devices and superconductive systems. A major problem in improving its energy conversion efficiency is how to achieve a better impedance matching. In
Xiaokuan You +4 more
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An improved water-filled impedance tube [PDF]
The Journal of the Acoustical Society of America, 2003 A water-filled impedance tube capable of improved measurement accuracy and precision is reported. The measurement instrument employs a variation of the standardized two-sensor transfer function technique. Performance improvements were achieved through minimization of elastic waveguide effects and through the use of sound-hard wall-mounted acoustic ...
Wilson, PS, Roy, RA, Carey, WM
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Acoustics, 2023 A comparison is considered of the experimentally obtained impedance of locally reacting acoustic liner samples with the impedance calculated using semi-empirical Goodrich, Sobolev and Eversman models. The semi-empirical impedance models are outlined.
Vadim Palchikovskiy +3 more
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P137 Reflections Revisited: Reinterpretation Required
Artery Research, 2020 Introduction: Pressure waveshape derived parameters such as the augmentation index are related to unfavourable cardiovascular events [1]. Wave reflections determine wave shape [2], however, several findings seem to contradict the current views.
Berend Westerhof, Nico Westerhof
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Resonant pumping in a multilayer impedance pump [PDF]
, 2008 This paper introduces the concept of multilayer impedance pump, a novel pumping mechanism inspired by the embryonic heart structure. The pump is a composite two-layer fluid-filled elastic tube featuring a thick gelatinous internal.
Avrahami, I., Gharib, M., Loumes, L.
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Design and experimental evaluation of a travelling wave thermoacoustic engine
Energy Reports, 2020 In a thermoacoustic engine, acoustic impedance plays a key role to improve the system performance. A matching stub is a component which can be applied to adjust the acoustic impedance.
Patcharin Saechan, Isares Dhuchakallaya
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