Abstract: A surface emitting laser includes a substrate, a stacked structure provided on the substrate and including a resonator and a first distortion applier connected to the resonator and applying distortion to the active layer, and a second distortion applier provided on the substrate and applying distortion to the active layer. As seen from a stacking direction, the first distortion applier has a first portion and a second portion provided with the resonator in between, as seen from the stacking direction, a longitudinal direction of the second distortion applier and a longitudinal direction of the first distortion applier are the same direction, and a magnitude relationship of a linear expansion coefficient of the second distortion applier to a linear expansion coefficient of the substrate is the same as a magnitude relationship of a linear expansion coefficient of the first distortion applier to the linear expansion coefficient of the substrate.

Abstract: A brake disc manufactured by a method of manufacturing a brake disc according to the present invention includes a carbon fiber Cf, silicon Si, silicon carbide Sic, and a silicon-copper alloy SixCuy. The carbon fiber Cf, silicon Si, carbon C, and silicon carbide SiC make a disc light and provide high thermal shock resistance, anti-oxidation, wear resistance, strength, and friction coefficient. The copper Cu and silicon-copper alloy SixCuy increase heat capacity at constant volume of a disc, so a large increase in temperature of the disc is prevented and a changing range of the friction coefficient is reduced in braking. Accordingly, the brake disc according to the present invention has all of the advantage of a brake disc made of a carbon fiber-reinforced ceramic composites without thermal deformation and deterioration of a pad, a hat part, and a caliper.

Abstract: A computer-controlled automated management system (20) for monitoring and controlling distribution and storage of money tills, and linking tracking of employee productivity to time in receipt of a till. The system (20) comprises a cabinet (22), a control panel (28), and a personal computer (30). The cabinet (22) is mounted through a wall to provide an interface having a front side accessible from a first area and a rear side accessible from a second area, such as, for example, a cash room. The control panel (28) is mounted next to the cabinet on the front side of the wall. The interior cabinet space is divided into a plurality of till compartments (24), with each compartment (24) being selectively accessible from both the front and rear of the cabinet (22). Tills are loaded and removed from the rear by cash room personnel and from the front by cashiers and other employees.

Abstract: Presented is a burglar alarm system for installation in residential, commercial or industrial premises. The burglar alarm system incorporates photographic equipment which photographs the intruder and a pneumatically operated audible alarm.