A brake mechanism for a baby stroller has a wheel brake device, a connecting element, an actuator and a retainer. The scheduling system utilizes a resource scheduler to minimize resource exception while at the same time minimizing the global costs associated with the solution. Then, a dielectric layer is formed of a LixTa1xO3 layer having a stable structure and a large dielectric constant, and a plate electrode is formed on the dielectric layer, thereby resulting in a capacitor. Sensors are jointly deployed in arrays on the surface andor in shallow monitoring wells to avoid the complicating effects of the free surface of the earth. The backing is removed from the adhesive hair fastener exposing the removable self adhesive tape, said self adhesive tape is applied to the scalp or back of the head of user.