Cars Technical Essay Example | Topics and Well Written Essays - 6000 words

Cars Technical - Essay Example After World War I, the United States became a renewal of economic growth, from new inventions to growth of an expanding road infrastructure. This economic growth helped accelerate the need for the automobile. The automobile industry grew quickly because of many innovative inventions. In the 1950's innovation was getting greater speed through the design of more powerful engines. In the 1960's innovation was building a sleek but performance driven auto. In the 1970's, the automobile and gas shortage led many automakers to look for innovative ways to control emission and decrease gas consumption. The convergence of computer and auto industries helped improve gas mileage and cut down on emission. The last 25 years of the car industry has seen technical and design advances that increased standardization, platform sharing, and CAD design. Body styles have changed to include the hatchback, minivan and sport utility vehicle (Consumer Guide p 10). Automotive engines are called internal combustion (IC) engine because the fuel that runs them is burned internally, or inside the engines. There are two types, reciprocating and rotary. Reciprocating means moving up and down, or back and forth. Almost all automotive engines are of the reciprocating type. In these engines, pistons moves up and down, or reciprocate, in cylinders. This type of engine is called piston engine. Rotary engines have rotors that spin, or rotate. The only such engine now used in automobiles is the Wankel engine. 1 )Types of Engine System: 1.1 Car Engine: The main function of a car's engine is to make it move. Engines come in a range of strengths as well as speeds. All recent engines are made of vital parts. Car engines are built around cylinders (generally something from 2-12 of them, however usually 4, 6 or 8) in which the fuel is burnt. Super-strong metal and sealed shut, arte used to make these cylinders however at one end open and closes exactly like bicycle pumps: these consist of tight-fitting pistons (plungers) that may slide up as well as down in them. At the top of every cylinder, there are two valves. The inlet valve permits fuel as well as air to go into the cylinder; the outlet valve lets the exhaust gases loose. At the very top of the cylinder, a sparking plug (or spark plug) is present, this is a device which is controlled electrically as well as makes a spark to put fire to the fuel. At the base of the cylinder, the piston is connected to a continually turning axle that is known as a crankshaft. The crankshaft's function is to powers up the gearbox of the car which then drives the wheels. The capacity of an engine function is depends on the power or the horse power that i t develops. This in turn is reliant on the ability of the engine. 2.)Diesel Engines: In 1892, Rudolph Diesel, a German engineer developed the "diesel" engine. Unlike the gasoline engine, the diesel engine is capable of spontaneous combustion of liquid fuel without requiring spark ignition. "The key advantage of the diesel engine over the gasoline engine is its fuel economy as well as durability" (en.wikipedia.org/wiki/Diesel_engine). Known as a "workhorse" the diesel engine became the engine of choice for heavy construction machinery, mining

Near Earth Objects (NEOs) Research Paper Example | Topics and Well Written Essays - 2000 words

Near Earth Objects (NEOs) - Research Paper Example Depending on how close they are to the Earth, they can be spotted with the naked eye, or they can be spotted with a telescope. Rather than clustered together, a comet is a single large object with a long tail. More often than not, it is the tail, and not the main part of the comet that can be seen. Near Earth Objects might be fun to look at, but they are capable of doing catastrophic damage. Craters around the world pay homage to the respect that they undoubtedly deserve. One of the most widely accepted theories for the extinction of dinosaurs is that a massive meteor struck the planet and radically changed both climate and atmosphere. Fortunately, when it comes to this modern age, there are methods and theories in which to deflect NEOs. All of these are untested, however, and have only performed in labs. A meteor, or meteorite, is a body of rock, ice, or metal that enters the Earth’s atmosphere. Many of these are small and harmless, and burn up upon entering the atmosphere. W hen you see a shooting star, or a meteor shower, that is what you are seeing. While no threatening meteors have recently struck the Earth’s surface, the evidence is all around us. The largest crater in the world, created by a meteor, is in South Africa in an area called the Vredforte Dome. This meteor hit the Earth more than 2 billion years ago, and was around 10 km in diameter. According to science, the impact of the meteor might have been massive enough to jumpstart multicellular life by increasing the amount of oxygen in the atmosphere. There are, to date, 841 World Heritage sites around the world. A World Heritage site is a special place that has either a cultural or a physical significance. These sites are chosen by the UNESCO (United Nations Educational, Scientific, and Cultural Organization), which has been around since 1945. While Earth appears safe for the most part, it has had its share of close calls. One such close call occurred in September of 2004. An asteroid b y the name of Toutatis swept by Earth, missing it by about a mile. Several kilometers in diameter, if Toutatis or a rock like it were to hit Earth, it would devastate life as humans know it. The sun would be obscured by a huge cloud of dust that would travel around the globe, changing the temperature and climate of the Earth. Plants would start to die from lack of sunlight, unable to complete their cycles of photosynthesis, and herbivores would begin to starve. Humans would have major crop failure as well, and would need to resort to another means of sustenance. Eventually, over time, civilization would cease to be. Food, if any survived at all, would be both precious and hard to come by. Water would become stagnant and toxic to drink, as the evaporation process would be altered without sunlight. The impact of a NEO of this size would ultimately either destroy all life on the planet, or force evolution into overdrive. A rare NEO that is usually only seen by astronomers with high-pow ered telescopes and other special equipment is the comet. These massive objects are made up of ice and organic material. They carry behind them a long ‘tail’, which consists of ice and other materials that it picks up as it hurtles through space. The ‘head’ of the comet is called a nucleus, which consists of the ice and organic materials. The core of the nucleus is as yet unknown. These beautiful objects are far older than many of the planets in the solar system, the majority of them estimated to be