Results 241 to 250 of about 978,883 (282)
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Ground effect over hard rough surfaces
The Journal of the Acoustical Society of America, 1998Laboratory and outdoor measurements are reported of the relative sound pressure level spectrum over hard surfaces containing either random or periodically spaced arrays of 2-D roughnesses. The resulting data have been compared with predictions obtained analytically and with numerical predictions of a boundary element code.
Patrice Boulanger +4 more
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Hard and Soft Surfaces Realized by Frequency Selective Surfaces on a Grounded Dielectric Slab
IEEE/ACES International Conference on Wireless Communications and Applied Computational Electromagnetics, 2005., 2005New designs of hard and soft surfaces realized by dipole and slot frequency selective surfaces (FSS) implemented on a grounded dielectric slab are presented. These structures act as GO or STOP surfaces for transverse electric (TE) and transverse magnetic (TM) polarizations, respectively, depending on the direction of a plane wave excitation. Multi-band
M.A. Hiranandani +2 more
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Surface Integrity Difference between Hard Turned and Ground Surfaces and Its Impact on Fatigue Life
CIRP Annals, 2006Surface integrity is the key for process selection of hard turning or grinding in industry. This study identifies the fundamental differences in the integrity of hard turned and ground surfaces and the subsequent impact on rolling contact fatigue life. The significant findings are: (a) mechanical deformation plays a larger role during hard turning than
F. Hashimoto, Y.B. Guo, A.W. Warren
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Bulletin of the Seismological Society of America, 2023
ABSTRACT In the framework of site-specific seismic hazard assessment, the definition of reference motion is a crucial step. Reference motion is generally associated with hard-rock conditions, characterized by S-wave velocity exceeding 1500 m/s.
Hussein Shible +3 more
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ABSTRACT In the framework of site-specific seismic hazard assessment, the definition of reference motion is a crucial step. Reference motion is generally associated with hard-rock conditions, characterized by S-wave velocity exceeding 1500 m/s.
Hussein Shible +3 more
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Coupled integral equations for sound propagation above a hard ground surface with trench cuttings
The Journal of the Acoustical Society of America, 2006A set of coupled integral equations is formulated for the investigation of sound propagation from an infinitesimal harmonic line source above a hard ground surface corrugated with cuttings. Two half-space Green’s functions are employed in the formulation.
Gong Li, Wang +2 more
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ECS Transactions, 2018
The paper deals with the change of selected 3D parameters of the surface texture of ground steels after application of diffusion technologies. The steel CSN 41 2050 and 34CrNiMo6 after nitriding and ferritic nitrocarburizing in gas and plasma were evaluated.
David Dobrocký +5 more
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The paper deals with the change of selected 3D parameters of the surface texture of ground steels after application of diffusion technologies. The steel CSN 41 2050 and 34CrNiMo6 after nitriding and ferritic nitrocarburizing in gas and plasma were evaluated.
David Dobrocký +5 more
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Hard and soft surfaces realized by FSS printed on a grounded dielectric slab
IEEE Antennas and Propagation Society Symposium, 2004., 2004Recently, a lot of research efforts have been devoted to periodic planar surfaces used to generate new equivalent boundary conditions. This work present new solutions for hard and soft surfaces realized by printing a "gangbuster type" frequency selective surface (FSS) on a grounded slab. Depending on the direction of wave propagation and on the nature -
S. Maci, P.-S. Kildal
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Roughness of ground and hard-turned surfaces on the basis of 3D parameters
The International Journal of Advanced Manufacturing Technology, 2007Recently, significant technological progress has been accomplished in the field of cutting processes, which still lasts nowadays. Namely, the processes requiring a significant amount of coolant are have been replaced by new processes requiring no coolant or demand minimal cooling.
J. Kundrak, K. Gyani, V. Bana
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Bulletin of the Seismological Society of America, 2023
ABSTRACTSite-specific seismic hazard assessment involves the prior knowledge of (1) the input ground motion at the local bedrock and (2) the site response. In this article and its companion, we address the deconvolution approach to obtain a reference ground-motion model, which consists of removing site effects from surface ground-motion recordings ...
Hussein Shible +3 more
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ABSTRACTSite-specific seismic hazard assessment involves the prior knowledge of (1) the input ground motion at the local bedrock and (2) the site response. In this article and its companion, we address the deconvolution approach to obtain a reference ground-motion model, which consists of removing site effects from surface ground-motion recordings ...
Hussein Shible +3 more
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IEEE Antennas and Propagation Society Symposium, 2004., 2004
This work gives a unified definition of the bandwidth for the soft and hard operations of periodic ground planes. The spectral FDTD technique is used to calculate the reflection coefficient on the entire wavenumber-frequency plane and soft and hard factors for TM and TE waves are found.
A. Aminian, Y. Rahmat-Samii
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This work gives a unified definition of the bandwidth for the soft and hard operations of periodic ground planes. The spectral FDTD technique is used to calculate the reflection coefficient on the entire wavenumber-frequency plane and soft and hard factors for TM and TE waves are found.
A. Aminian, Y. Rahmat-Samii
openaire +1 more source