It has been suggested by Morse and Ingard that the sound radiation of a loudspeaker in a box is comparable to that of a spherical cap on a rigid sphere. This has been established recently by the present authors, who developed a computation scheme for the forward and inverse calculation of the pressure due to a harmonically excited, flexible cap on a rigid sphere with an axially symmetric veloci...

Direct displacement-based design is a nonlinear static procedure and has to check the suitability of method against different types ground motions namely far field, near field forward directivity fling step. The applied for buildings supported on fixed base hysteretic isolation bearings. Seismic isolators are provided between foundation superstructure minimize influence motion superstructure. f...

Measurements of the directivity of musical instruments are presented in the context of a new directivity representation of sources for auralizations. Three instruments have been recorded over the whole compass simultaneously in both horizontal and vertical planes with a multimicrophone array. Results are analyzed focusing on the differences between the directivity of particular tones and the av...

The nominal directivity for uniformly spaced broadside parallel half-wave dipoles associated with a uniform excitation is evaluated. The amplitude distribution for an optimized directivity is then obtained for different numbers of elements with the separations between the dipoles as a variable. The optimum and nominal directivities are compared for different spacings of the elements. While thes...

It is generally believed that spike timing features (firing rate, ISI) are the main characteristics that can be related to neural code. Contrary to this common belief, spike directivity, a new measure that quantifies transient charge density dynamics within action potentials (APs) provides better results in discriminating different categories of visual object recognition. Specifically, intracra...

Recent studies emphasize the rapid assessment of earthquake source properties, such as moment magnitude, to help alleviate the impact of earthquakes. Depending on local crustal structure, earthquakes occurring at different depths can differ greatly in high-frequency motions, which emphasizes the importance in constraining focal depth for the predictions of strong motions. For large earthquakes,...

A method to improve the directivity of the microstrip coupler is presented. The width of the coupler is modified for phase velocity compensation which results in high directivity. Using this procedure, a 15 dB coupler is designed and simulated at 0.9 GHz using SONNET software. A high directivity of 46 dB is obtained. The validity of the design concept is verified and compared with conventional ...

Abstract This paper describes a detailed numerical investigation into the inelastic displacement ratios of non-structural components mounted within multi-storey steel framed buildings and subjected to ground motions with forward-directivity features which are typical near-fault events. The study is carried out using multi-degree-of-freedom models 54 primary different structural characteristics....