Jagged array

Abstract: The utility model relates to the field of piezoelectric loudspeaker, in particular to an array type piezoelectric loudspeaker set with a jagged mounting substrate, wherein the substrate is jagged thin plate and formed by a plurality of planar mounting surfaces through connection, the included angles of all two adjacent mounting surfaces are equal and from 0 DEG to 180 DEG, each mounting surface is provided with a hollow mounting hole, the piezoelectric loudspeakers are bonded with a front cavity housing with an opening and a closed rear cavity housing and mounted inside the mounting hole of the substrate, the piezoelectric loudspeakers are electrically connected in parallel, and the center points of the piezoelectric loudspeakers are collinear and equal in distance. The interference and sound absorption effect of the planar loudspeaker array can be improved through introducing the jagged substrate; and the spatial sound field effect of the loudspeaker can be improved and the utilization range of the piezoelectric loudspeakers can be enlarged through optimizing the spatial directivity of the loudspeakers. The planar included angle of the jagged substrate can influence the directivity of the high frequency range in the loudspeaker array, and the excellent sound field effect of the planar piezoelectric loudspeaker array can be obtained through adjusting the planar included angle.

Abstract: An anti-masking device for an intrusion detector and method for detecting a masking substance is disclosed. The device can comprise a cover enclosing an interior area housing an electric light source and a light detecting sensor. The cover can have a light-permeable area having an exterior surface with a jagged array including a plurality of parallel spaced-apart teeth forming a series of alternating channels and projections. A light guide can be provided with opposing first and second ends. The first end can be located within the interior area adjacent the light source and the second end can be located adjacent the exterior surface of the cover. The light guide can be configured to direct light outside the cover and onto the jagged array. The jagged area can be configured to refract light from the light guide through the cover and into the interior.

Abstract: We develop a new scheme for evaluating different molecular integrals using Gaussian type orbitals. In this new scheme, the evaluation of integrals is performed in two steps during runtime. The first step is a top-down procedure that maps each recurrence relation into a jagged array (array of arrays), where each element of a member array represents either the final results or some intermediate integrals that are stored in our developed data structure "coarse-grained circular buffer". This step is the same for all different one- and two-electron operators so that the same algorithm and source codes can be used. In the second step, a bottom-up procedure is carried out that computes all the intermediate and the final molecular integrals by backtracking elements from the last member array of each jagged array. Different source codes should in principle be used for different electron operators in the second step, but which can be generated automatically by our developed recurrence-relation compiler. The currently proposed general recurrence-relation generation scheme provides a new, generic and automatic programming way for various one- and two-electron integrals needed in computational chemistry. Users can even introduce new electron operators and evaluate their integrals during runtime by combining the implementation of the proposed new scheme and the just-in-time compilation technique.