Light patterns

Leslie, R. P., and Conway, K. M. (1996). Tbe Lighting Pattern Book for Homes, 2nd ed. New York McGraw-Hill. Leslie, R. P., and Rogers, P. (1996). Outdoor Lighting Pattern Book. New York McGraw-Hill. 

Bar code scanners, for example, exploit the directionality of a laser beam. The laser light reflects more strongly from white stripes than from black. Because of the directionality of the laser beam, the reflected laser beam faithfully mirrors the pattern of the bar code. A sensor reads these variations and converts the light pattern into an eiectronic representation of the bar code. The sensor transmits the electronic representation to a computer. 

When a light pattern illuminates the front face (Fig. 8.17(b)), the light passes through the transparent electrode to interact with the photoconductive layer, raising its conductivity. Simultaneously a voltage pulse (about 200 Y) is applied across the electrodes, the major part of which, in the illuminated regions, drops across the ferroelectric. As a result the polarization is switched from the strain-biased configuration to a direction approximately normal to the plate. In this... 

The ceramic plate, ITO electrodes and photoconductive layer are arranged as in the previous example. In its unpoled state the PLZT scatters light, probably at the 71° and 109° domain boundaries associated with the rhombohedral structure. When a voltage pulse is applied simultaneously with a light pattern incident on the plate, the polarization is switched to a direction normal to the plane of the plate and the scattering is reduced. 

Rhesus monkeys (Macaca mulatta) are another species used for DART evaluation [4], However, this species displays pronounced seasonality of reproductive activity for both sexes [13,14], In this primate, reproductive functions are entirely shut off or severely diminished for approximately half of the year. In environments with distinct seasons sexual activity and gonadal activity are present roughly throughout October until March, but this may vary substantially for individual animals. It is crucial to consider that the annual rhythmicity of reproductive cycles can persist over years in captivity and under indoor artificial light pattern conditions [15], Hence in indoor circumstances seasonality of reproduction may be uncoupled from the outdoor season, and eventually an animal may display periodic reproductive activation in unexpected months. 

Low-level visible light that is naturally present may be amplified and presented directly to the viewer s eye. (Light in the near-infrared part of the electromagnetic spectrum [ 0.77-1.0 microns], either naturally present or supplied as illumination, may also be amplified and its pattern translated into a visible-light pattern for the viewer s benefit.) This technique is termed image intensification. 

Figure 21. Photo-electrophoretic imaging configuration (2). The light pattern to be reproduced must be projected into the imaging nip through a transparent...

To account for static, lattice periodic light patterns in the photosensitive BZ reaction, we add a symmetry breaking perturbation eH u) to... 

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