Some of the decline occurred because of the installation of the pollution-control equipment required by the Clean Air Act; some is attributable to reduced activity in the iron and steel industries.
Tourism, however, has threatened the preservation of the caves; the most serious problem is the algal growth that has formed in the wall paintings because of the installation of electric lights.
Because of the installation cost of a communications channel, such as a microwave link or a coaxial cable link, it is desirable to share the channel among multiple users.
Although peak demand on Monday was 150 megawatts more than last year's peak, Richard Kessel, LIPA's chairman, said the utility was in better shape because of the installation of 10 new privately operated generators at six locations.
Our findings highlight that irrigated areas formed deeper sulfuric materials (> 3.5 m) than in adjacent natural wetlands (< 1 m) due to the difficulties in the management of water tables in irrigation areas because of the installation of high levee banks and deep drains.
However, the requirement of the AC power supply hinders the daily use of the SnO2 gas sensor in the house because of the installation problem and the bad appearance.
Both gravity flow irrigation of valley land and low lift pumping to hillslope and hilltop from rainwater harvesting reservoir were much more economical compared to forced mode pumping of groundwater because of the installation and annual operating cost of groundwater pumping.
And the Paris Exposition of 1878 featured the new power of electric light, solidifying the city's reputation as the city of lights (originally earned because of the installation of 56,000 gas lights on the streets in the 1860s).
It is not realistic, because most of the installation site does not have detailed annual spectrum information.
It is not, however, a very exciting show, in part because of the scattered installation, in part because of the uneven quality of the work.
