The first library in the United States to be commissioned by Carnegie was in 1886 in his adopted hometown of Allegheny, Pennsylvania (now the North Side of Pittsburgh). In 1890, it became the second of his libraries to open in the USA.
Selective exposure is a theory within the practice of psychology, often used in media and communication research, that historically refers to individualsâ tendency to favor information which reinforces their pre-existing views while avoiding contradictory information.ccuracy motivation is not always beneficial within the context of selective exposure and can instead be counterintuitive, increasing the amount of selective exposure. Defense motivation can lead to reduced levels of selective exposure.
1 Traffic collision avoidance system (TCAS), which actively interrogates the transponders of other aircraft and negotiates collision-avoidance tactics with them in case of a threat. 2  TCAS systems are relatively expensive, and tend to appear only on larger aircraft. Obstacle Collision Avoidance System is a ground based system that uses a low powered radar mounted on or near the obstacle. 2  The radar detects aircraft in the proximity of the obstacle and firstly warns aircraft via flashing medium intensity lights and secondly warns aircraft of the obstacle via a VHF broadcast.