Summary Essay Example | Topics and Well Written Essays - 250 words - 175

Summary - Essay Example Ionization uses two radioactive plates that can produce either a negative or positive charge. The device is designed to decrease in current flow once the smoke enters the chamber and causes an interruption in the positive or negative charges of the device. The radioactive material that the air comes into contact with causes the air to become a conductor. This system works on a totally different basis from the Photoelectric smoke detection. As the name connotes, the photoelectric system works by sensing the environmental light that enters the detection chamber. The light that enters the system is scattered and triggers the alarm sensor to emit a warning sound in the room. While the light obscuring type creates a less intense type of light as it detects the smoke in order to sound the alarm. Owing to this comparison, I believe that the photoelectric technology is most trustworthy since I understand how light works. I know nothing about radioactive materials and would not be comfortable around that technology. I find it dangerous and would not risk exposing my family to its well known dangers. The NFPA 72 dictates that in residential occupancies, fire alarm boxes should be no further than five feet from the nearest exist and be only between 42 -48 inches from the floor. Both sides of the exists should have existing fire alarms in an open space of approximately forty feet in width. The distance between the alarms should not be more than 200 feet from each other when installed in big rooms or hallways. For visibility the fire alarm bells should be red except in instances when the wall itself is painted red. In such instances, the alarm bell should be painted silver. Just like with anything that must be installed, one must consider the needs of the environment before a smoke detector is installed. For example, in a tall, multi floor room, a beam smoke detector

Sustainable Water Use in Australia Assignment Example | Topics and Well Written Essays - 1750 words

Sustainable Water Use in Australia - Assignment Example The South Western parts of Australia are the driest parts, which experience varying climatic conditions. In addition to the global climatic change, variability in rainfall in these regions poses a significant challenge towards achieving sustainability in the usage of water. The irrigation methods used by farmers consume a lot of water resulting in water deficits in towns. Due to the increased demand for Australia’s food exports, farmers tend to exploit the water resources to the fullest. Therefore, the fact that some parts of the continent have inadequate water resources makes it hard for the entire continent to achieve sustainability in water usage. In the attempts to ensure adequacy of water in all areas, some politicians in Australia have hindered the achievement of water use sustainability. The political climate, in this case, is created and facilitated by the actors (politicians) who want to protect their interests and stay in power (Filho 2012, p. 243). Â  Another signi ficant challenge to the sustainable use of water is population growth. Most people living in rural areas, as well as urban centres, use water for domestic and industrial purposes. Thus, the increase in population raises the demand for water from the scarce water resources such as rivers and lakes. Population growth is usually associated with environmental pollution and degradation. An increase in the number of people in a certain area without an equal increase in water provision results to over-exploitation of water resources.