Since effective area coverage appears fairly remote, the requirement can be borne in mind while considering the elements: air, surface, sub-surface, fixed installations, mines, and intelligence.

Since the 1990s the region has experienced an exceptionally tumultuous period in its regional economy with the collapse of large portions of the ground fishery throughout Atlantic Canada, the closing of coal mines and a steel mill on Cape Breton Island, and the closure of military bases in all three provinces.

Since combat engineers with mine-clearing equipment can clear a path through a minefield relatively quickly, mines are usually considered effective only if covered by fire.

Since the mines are buried, the ground directs the energy of the blast in a single direction — through the bottom of the target vehicle or on the track.

Since mining entails removing dirt and rock from its natural location creating large empty pits, rooms and tunnels, cave-ins as well as ground and rock falls are a major concern within mines.

Since mid-1915, the British had been covertly digging mines under the German positions on the Messines Ridge.

Since the closing of the 5 Slickville mines by 1942, the nearby Patton and Jamison mines in the 50's, and the near total abandonment of mining of ' high sulfur ' coal in the area since the 1980s, Slickville has benefitted economically from its proximity to other cities in the area.

Since anti-tank mines rely on a concentrated explosion to destroy a tank, they are useless when turned upside-down ; as the tank runs over the mine, it will expend its blast down instead of upwards, causing insignificant damage, if any.

Since the 16th century the exploration of the Brazilian inland was attempted several times, mostly to try to find mineral riches like the silver mines found in 1546 by the Spanish in Potosí ( now in Bolivia ).

Since 1999, the use of antipersonnel mines and mine-like improvised explosive devices ( IEDs ) by non-state armed groups ( NSAGs ) have been reported in at least 28 countries.

Since the coal mines closed, Iizuka city has suffered from a consistently declining population base.

Since it is commonly known that water produced by a process of reverse osmosis and deionization would produce water of a far higher purity than any naturally found underground, it is possible that the use of water specifically from one of China's deepest mines may have been used to carry a symbolic meaning to the mission.

Since 1988, HALO Afghanistan has destroyed over 692, 000 mines ( 156, 000 emplaced mines and 536, 000 stockpiled mines ), nine million items of large calibre ammunition and 45. 4 million bullets.

Since the start of 2007, HALO has been conducting a re-assessment to identify the remaining mines problem and the assets required to clear the remaining mine and Explosive Remnants of War ( ERW ) problem in a reasonable time frame.

Since 1996 40 illegal immigrants have been killed by mines, after entering Greek territory in Evros.

Since the deep mines in the Lancashire coalfield closed, all its coal is either imported ( largely by train from Liverpool docks ), or supplied from mines in Yorkshire.

Since a number of conscientious objectors were sent to work down the mines as an alternative to military service, there was sometimes an assumption that all Bevin Boys were " Conchies ", and, although the right to conscientiously object to killing was recognised in conscription legislation, as it had been in the First World War, old attitudes still prevailed amongst some members of the general public, with resentment by association towards Bevin Boys.

Since the 1950s the theory that they were ancient chalk mines has gained acceptance.

Since the Germans used the Gauss as the unit of the strength of the magnetic field in their mines ' triggers ( this was not yet a standard measure ), Goodeve referred to the various processes to counter the mines as degaussing.

Since the homosexuals widely use marijuana, they do not have to be initiated.

Since the slogans have little application to reality and are sanctimonious to boot, the applause is faint even in areas of the world where we should expect to find the greatest affection for free government.

Since Rhode Island at that time did not have such sanction, his opinion was not popular.

Since the great flood of these dystopias has appeared only in the last twelve years, it seems fairly reasonable to assume that the chief impetus was the 1949 publication of Nineteen Eighty-Four, an assumption which is supported by the frequent echoes of such details as Room 101, along with education by conditioning from Brave New World, a book to which science-fiction writers may well have returned with new interest after reading the more powerful Orwell dystopia.

Since 1957, more and more trans-Atlantic passengers have been crossing by air.

Since two of these could be trustees of the college, actually it would be necessary to have the consent of only one elected official to impose a levy of millions of dollars of tax revenue.

Since appeals to morality, to humanity, and to sanity have had such small effect, perhaps our last recourse is the deterrent example.

`` Since the war I have seen the way the Germans have behaved and I think, Holy Mother, we have behaved like this for hundreds of years.

Since that time the demands of the citizens for new and expanded services have placed financial burdens on the state which could not have been foreseen in earlier years.

Since faculty see themselves as self-employed professionals rather than as employees, enthusiasm in a common enterprise is proportionate to the sense of ownership they have in it by virtue of sharing in the decisions that govern its course.

Since the concept of high fidelity became important some dozen years ago, the claims of technical improvements have multiplied tenfold.

Since SAAMI's conception in 1926, and more specifically since the adoption of the Shooting Development Program in 1954, millions of dollars and promotional man-hours have gone into the development of more places to shoot for more youths and adults.

Says NRLDA's James Wright: `` Since 1958 carriers that move material from the yard to the job site have undergone more radical changes than any of the dealer's other equipment ''.

Since practical washing procedures are both lengthy and expensive, a number of laboratory tests have been developed for the numerical evaluation of detergents.

Since there is a continual loss of micrometeoritic material in space because of the radiation effects, there must be a continual replenishment: otherwise, micrometeorites would have disappeared from interplanetary space.

Since Af and P divides Af for Af, we have Af.

A final class of exceptional lines is identifiable from the following considerations: Since no two generators of Af can intersect, it follows that their image curves can have no free intersections.

Since they are all either rented or borrowed, the requested dates for their use have to be far in advance.

Since the writer had not noticed this characteristic in married students scattered throughout the various sections previous to this experiment, nor, as a matter of fact, in those who were continuing in `` single sections '', he can only conclude that there must have been something `` contagious '' within the specific group which caused this to occur.

Since the details of the elections were settled the change of government had no direct effect on the technical aspects of the elections, and may have been more important as an indication of royal displeasure with the U.N.F.P.

Since 1917 some thirteen supplementary and related acts have extended this Federal program.

Since this type of item was not in the statute when section 381 was enacted in 1954, one cannot say with certainty what effect the enactment of that section should have.