It is sometimes a good idea to periodically close the apps to speed up your phone.
Last summer, four of his top officials were killed in a rebel bombing, and shells have periodically landed close to some of his many residences, but Mr. Assad is not known to have personally come under fire.
Low water levels caused the Coast Guard to periodically close an 11-mile section of the Mississippi River to ships this month.
During the past year, smog has forced the city to periodically close highways, cancel flights and even cope with state-run media assaults on health problems caused by poor air quality.
NASA's Near-Earth Object Program at NASA Headquarters, Washington, manages and funds the search, study and monitoring of asteroids and comets whose orbits periodically bring them close to Earth.
Finance ministers gave their political seal of approval to the accord earlier in the week, but the announcement on Wednesday signified the end of negotiations that had provoked tensions between Greece and some of its creditors and that periodically had teetered close to failure.
One of them is the US space agency's Near Earth Objects (Neo) programme, which manages and funds the search, study and monitoring of asteroids and comets whose orbits periodically bring them close to the Earth.
Hence Pluto periodically comes closer to the Sun than Neptune, but an orbital resonance with Neptune prevents the bodies from colliding.
But Kim also has periodically closed the country to visitors, most recently this spring, when borders were shut purportedly because of fears of Ebola.
In ecology, oscillations occur in predator-prey systems in which the individual components are organisms, each of which may be born or die only once [15]; and in oscillating chemical systems such as the Belousov-Zhabotinsky reaction or the brusselator, molecules undergo reactions at effectively random times yet the overall concentrations fluctuate close to periodically [16], [17].
