Abstract:
A circuit comprising an array of light emitting diodes (LEDs), and a layer of VSD material positioned to contact an input and an output of each LED in the array of LEDs, so as to protect each LED from both a forward surge and a reverse surge of voltage on the array of LEDs. The layer of VSD material is able to switch into a carrying current state in response to either of the forward or reverse surge exceed a characteristic voltage level (VCL) of the VSD material.
Abstract:
Embodiments disclosed herein generally relate to structures, methods and devices employing a voltage switchable dielectric material to achieve vertical and/or dual switching protection against ESD and other overvoltage events.
Abstract:
A paving block has six sides, and a top (10) and a bottom surface (12). Two of the side surfaces (14, 16) are substantially parallel and substantially twice as long as each of the other four side surfaces (18, 20, 22, 24), two surfaces (18, 20) of the said other four side surfaces each making an angle of substantially 120 with one end of each of the longer side surfaces (14, 16) and each other side surface (22, 24) making an angle of substantially 60 with the other end of each of the longer side surfaces (14, 16). In other words, a block according to the invention as seen in plan is of "chevron" shape a shape that could also be termed a squat "V" shape. This is a simple, easily manufactured block, which permits numerous different arrangements to be laid.
Abstract:
Embodiments disclosed herein generally relate to structures, methods and devices employing a voltage switchable dielectric material to achieve vertical and/or dual switching protection against ESD and other overvoltage events.
Abstract:
An edge-restraining device includes an elongate upstanding edge-restraining member (10) connected to a geogrid (16). A geogrid is an open mesh or perforated or apertured mat of textile, synthetic plastics or other flexible material capable of interengaging and interlocking to some extent with a base course of rubble, etc.
Abstract:
A paving block is made up, as seen in plan, of two connected portions (10, 12) one portion (10) comprising four connected substantially identical quadrants (14-17) and the other portion (12) having an inside-out pillow shape defined substantially by four arcuate surfaces. The curvature of each surface is substantially the same as that of the curved boundary of any one of the quadrants (14-17). Such a block may have various proportions, and may be made to various dimensions. However it is preferred for the blocks to be of such a size and weight that one can readily be held in one hand. This simplifies and makes less expensive the process of laying the blocks. Such blocks when laid have improved structural stability.