Radiation-absorbing material, such as lead or concrete, used to reduce radiation exposure A primary barrier attenuates useful beam to the required degree A secondary barrier attenuates stray radiation to the required degree
The function of a barrier is to control the water level It consists of a combination of concrete or a steel structure with or without adjacent rockfill
Point of synchronization for multiple simultaneous processes Each process reaches the barrier, and then waits until all of the other processes have reached that same barrier before proceeding
physical separator between elements erected for specific purposes such as blocking noise or channeling traffic (see also: noise barrier; sound barrier; traffic barrier)
A material that when placed around a source of noise inhibits the transmission of that noise beyond the barrier Also, anything physical or an environment that interferes with communication or listening e g , a poor acoustical environment con be a barrier to good listening and especially so for persons with a hearing impairment
Something that bars or keeps out Barrier pillars are solid blocks of coal left between two mines or sections of a mine to prevent accidents due to inrushes of water, gas, or from explosions or a mine fire
Collective operation used to synchronize the execution of processes MPI_Barrier blocks the calling process until all receiving processes have called it This is a useful approach for separating two stages of a computation so messages from each stage are not overlapped