A patient support apparatus includes a frame and a deck carried on the frame. Also disclosed are articles, including laminates and monolayer or multilayer structures comprising such compositions to which neither powders nor dusts easily adhere electrostatically. The operating frequency may be defined by a frequency selective feedback element that is thermo-optically tuned by the application of heat from an actuator without substantially tuning the cavity modes. Vehicle acceleration can be determined from the difference of the current desired velocity and the predicted future velocity for controlling the velocity and acceleration of the vehicle to the predicted future velocity.