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Driving

Driving

Driving is the controlled operation of a vehicle, which is usually a motor vehicle such as a truck, bus, motorcycle, or car. For bicycles and mounted animals and — at least in the U.K., the U.S. and Canada — motorcycles, the corresponding activity is called riding. Driving includes knowing how to operate the mechanisms which control the speed and direction (which in technical terminology are both components of the velocity), and the braking of the vehicle, and especially includes knowing how to do both safely.

Road transport

Driving as a physical skill

In terms of the basic physical tasks required, driving a motor vehicle generally involves:
- Starting the vehicle's engine with the starting system
- Setting the transmission to the correct gear
- Depressing the pedals with one's feet to accelerate and slow the vehicle (and, if necessary, to change gears)
- Steering the vehicle's direction with the steering wheel
- Operating other important ancillary devices like the headlights and windshield wipers
- Watching the road conditions in all directions around the vehicle (including frequent checks behind the vehicle using mirrors) to monitor the relative location of other vehicles, bicyclists, and pedestrians.

Driving as a survival skill

Of course, driving is far more complicated than simply pressing pedals and turning the steering wheel; it also involves looking out for everyone else (and everything) on the road. The skill of safe driving is necessary to avoid collisions, which kill many thousands of people annually (see also Car accident). And safe driving is much more than following the legally prescribed rules of the road. It goes beyond that into the cultivation of good habits, maintaining attention, and a thoughtful, cooperative attitude that avoids and prevents accidents. This is often described as defensive driving.

Laws covering driving

In most countries, the use of public roads is heavily governed by law. Laws cover the construction and maintenance of roads, the construction and use of vehicles, the rules of the road, the requirements for driver and vehicle licensing (see Driver's license and License plate), vehicle taxation, safety inspections and compulsory insurance. These laws reflect the high degree of responsibility which is imposed upon both the drivers and manufacturers of vehicles to make them as safe in use as they can possibly be. Motorists are almost universally required to take lessons with an approved instructor and pass a driving test before being granted a license. The trend has been towards increasingly tougher tests in recent decades. Almost all countries allow all adults with good vision to apply to take a driving test and, if successful, to drive on public roads. Saudi Arabia, however, bans women from driving vehicles (and riding bicycles) on public roads. Saudi women have periodically staged driving protests against these restrictions. In many countries, even after passing one's driving test, new drivers may be initially subject to special restrictions. For example, in Australia, novice motorists are required to carry "P" ("probationary") plates, and are subject to lower speed limits, alcohol limits, and other restrictions for their first two years of driving.

Minimum driving ages

The minimum age required for driving varies depending on the country. The most common age is 18. Here are the ages required in some countries (in alphabetical order), note that some regions of the countries may start at a different age than other regions, this is just the minimum age requirement to drive:
- Albania: 18
- Australia
  - New South Wales: 16
  - South Australia: 16
  - Victoria: 18
  - Queensland: 17
  - Northern Territory: 17
  - Tasmania: 16
  - Western Australia: 17
- Austria: 17
- Belgium: 18
- Brazil: 18
- Canada: 16
- China: 18
- Denmark: 18
- Egypt: 18
- Ethiopia: 14
- Finland: 18
- France: 18
- Germany: 18
- Greece: 18
- Hong Kong: 18
- Indonesia:17
- Iceland: 17
- Iran: 18
- Ireland: 17
- India: 18
- Isle of Man: 16
- Italy: 18
- Japan: 18
- Luxembourg: 18
- Malaysia: 17
- Malta: 18
- Mauritius: 18
- Netherlands: 18
- New Zealand: 15
- Norway: 18
- Oman: 18
- Pakistan: 18
- Philippines: 17
- Poland: 18
- Portugal: 18
- Romania: 18
- Russia: 18
- South Africa: 18
- Singapore: 18
- Spain: 18
- Sweden: 18
- Switzerland: 18
- Taiwan: 18
- Tanzania: 18
- United States: Varies from 15 to 18 by state
- United Kingdom: 17
- Uruguay: 18
- Venezuela: 18

Enforcement of driving-related laws

Each country has its own unique way of dividing up the responsibility for enforcing all the laws mentioned above. In nearly all countries, though, the laws controlling driving in practice (like speed limits) are enforced by the police, who are in the best position to identify violations as they occur and to issue citations or make arrests. Some countries, like Australia, prefer to put everything road-related into a single agency at the state level. Thus, in the Australian state of New South Wales, the Roads and Traffic Authority (RTA) is responsible for driver licensing; highway construction, maintenance, and patrol; and many other things. In contrast, in the United States, many U.S. state governments have a Department of Transportation that handles road construction and maintenance (subject to some guidance from the federal Department of Transportation), and a separate Department of Motor Vehicles that handles driver licensing and vehicle registration. There is usually a state police agency (called the Highway Patrol or Department of Public Safety) which enforces driving laws on state highways. On local roads, driving laws are enforced by county sheriff's departments or city police departments. In many jurisdictions, bicycles are legally considered to be vehicles and cyclists are legally classified as drivers. The riding of bicycles is rarely subject to licensing. However, some municipalities may require a permit for the bicycle.

Rail transport

In rail transport, steering is done by controlling the switch points; this can be done:
- by other personnel than the driver, often remotely from a traffic control point.
- by the driver from his or her position.
- by the driver getting out and operating the switch manually.

See also


- Chauffeur
- Drunk driving
- Highway Code (official road safety manual for the United Kingdom)
- Highway patrol
- Institute of Advanced Motorists
- Manual transmission driving technique
- Pedal
- Performance driving techniques
- Road safety
- Road construction
- Road racing
- Road sign
- Rules of the road (driving on the left- or right-hand side)

References


- [http://www.advanced-driving.co.uk Advanced Driving UK - Going beyond learner driving]
- [http://www.2pass.co.uk/ages.htm 2Pass.co.uk]: Minimum Driving Ages. - [http://www.2pass.co.uk/ages.htm] and [http://www.2pass.co.uk/ages3.htm].
-

Vehicle

:This article is about the means of transport. For the political meaning, see electoral vehicle. For the economical meaning, see economic vehicle Vehicles are non-living means of transportation. They are most often man-made (e.g. cars, motorcycles, trains, ships, and aircraft), although some other means of transportation which are not made by man can also be called vehicles; examples include icebergs and floating tree trunks. Vehicles may be propelled by animals, e.g. a chariot or an ox-cart. However, animals on their own, though used as a means of transportation, are not called vehicles. This includes humans carrying another human, for example a child or a disabled person. Most land vehicles have wheels. Please see the wheel article for examples of vehicles with and without wheels. Movement without the help of a vehicle or an animal is called locomotion. The word vehicle itself comes from the Latin vehiculum. AVL stands for Automatic Vehicle Location.

Types of vehicles


- Aircraft
- Cars
- Auto rickshaws
- Boats
- Buses
- Coaches
- Motorcycles
- Trains
- Ships
- Vans
- Bicycles
- More...

External Links


- [http://www.epa.gov/greenvehicles/ Green Vehicle Guide]
- [http://www.nhtsa.dot.gov/cars Vehicle Information] Category:Transportation simple:Vehicle

Truck

:For further uses of the word truck, see Truck (disambiguation). :"Pantech" redirect here. for the mobile phone company, see Pantech (mobile phone company). A truck is a motor vehicle for transporting goods. Unlike automobiles, which usually have a unibody construction, most trucks (with the exception of the car-like minivan) are built around a strong frame called a chassis. They come in all sizes, from the automobile-sized pickup truck to towering off-road mining trucks or heavy highway semi-trailers. The term is most commonly used in American English and Australian English to refer to what earlier was called a motor truck, and in British English is often called a lorry, a Heavy Goods Vehicle (HGV), or (slang) a wagon (sometimes spelled waggon). This type of truck is a motor vehicle designed to carry goods, with a cab and a tray or compartment for carrying goods. Other languages have loanwords based on these terms, such as the Malay lori. In Australia and New Zealand a small truck with an open tray is called a "ute" (utility vehicle). "Pantechnicon" is a British word for a furniture removal van that has now fallen out of usage. It was originally coined in 1830 as the name of a craft shop or bazaar, in Motcomb Street in Belgravia, London. The shop soon closed down and the building was turned into a furniture warehouse, but the name was kept. Vehicles transporting furniture to and from the building, known as pantechnicon vans, soon came to be known simply as pantechnicons. A Pantech truck or van is a word derivation of pantechnicon commonly and currently used in Australia. Pantech refers to a truck and/or van with a freight hull made of (or converted to) hard panels (ie. chilled freight, removal vans etc). London.]]

History

Steam trucks

London Trucks and cars have a common ancestor: the steam-powered "fardier" Nicolas-Joseph Cugnot built in 1769. However, steam trucks were not common until the mid-1800s. The roads of the time, built for horse and carriages, limited these vehicles to very short hauls, usually from a factory to the nearest train station. The first semi-trailer appeared in 1881, towed by a De Dion steam tractor. Steam-powered trucks were sold in France and the United States until the eve of World War I, and the beginning of World War II in the United Kingdom.

Internal combustion

The first internal combustion engine truck was built in 1898 by Gottlieb Daimler. Others, such as Peugeot, Benz and Renault also built theirs. Trucks of the era mostly used two-cylinder engines could have a carrying capacity 1500 to 2000 kg. In 1904, 700 heavy trucks were built in the United States, 1000 in 1907, 6000 in 1910 and 25000 in 1914. After World War I, several advances were made: pneumatic tires replaced full rubber, electric starters, power brakes, 6 cylinder engines, closed cabs, electric lighting. The first modern semi-trailers also appeared. Touring car builders such as Ford and Renault entered the heavy truck market.

Diesel engines

Although it had been invented in 1890, the Diesel engine was not common in trucks in Europe until the 1920s. In the United States, it took much longer for that type of engine to gain acceptance: gasoline engines were still in use on heavy trucks in the 1970s, while in Europe they had been completely replaced 20 years earlier.

Legal Issues

Trucks have often had to pay higher tax rates, and have been subject to extensive regulation. Partly this is because they are bigger, heavier, and cause more wear and tear on roadways. This is one reason that UPS vehicles are called 'package cars', because that exempted them from certain tax-rates. Rules are in place for tractor-trailer rigs, regulating how many hours a driver may be on the clock, and how much rest time/sleep time is necessary (11hrs on/10hrs off; 60hrs/7days; or 70hrs/8days). Many other rules apply. Violations of these laws are subject to large fines. Notice that these hours are different in other jurisdictions. Always check up before you go.

Types of trucks by size

jurisdiction

Light trucks

Light trucks are car-sized (in the US, no more than 6,300 kg (13,000 lb)) and are used by individuals and commercial entities alike. They are comprised of:
- Pickup trucks
- Full-Size vans
- Minivans
- SUVs
- Luton van body - where the load area extends over the cab.

Medium trucks

Medium (or medium-duty) trucks are bigger than light but smaller than heavy trucks. In the US, they are defined as weighing between 6,300 kg (13,000 lb) and 15,000 kg (33,000 lb). For the UK the cut-off is 7.5 tonnes. Local delivery and public service (dump trucks, garbage trucks) are normally around this size.

Heavy trucks

garbage truck Heavy trucks are the largest trucks allowed on the road. They are mostly used for long-haul purposes, often in semi-trailer configuration. In Australia many trailers are connected to make road trains.

Off-road trucks

Highway-legal trucks are sometimes outfitted with off-road features such as a front driving axle and special tires for applications such as logging and construction. Trucks that never use public roads, such as the biggest ever truck, the Liebherr T 282B off-road mining truck, are not constrained by weight limits.

Anatomy of a Truck

Almost all trucks share a common contruction: they are made of a chassis, a cab, axles, suspension and wheels, an engine and a drivetrain.

Chassis

A truck chassis consists of two parallel U-shaped beams held together by crossmembers. It is usually made of steel, but can be made (whole or in part) of aluminium for a lighter weight. The chassis is the main structure of the truck, and the other parts attach to it.

Cab

The cab is an enclosed space where the driver is seated. A sleeper is a compartment attached to the cab where the driver can rest while not driving. They can range from a simple 2 to 4 foot (0.6 to 1.2 m) bunk to a 12 foot (3.7 m) apartment-on-wheels. Modern cabs feature air conditioning, a good sound system, and ergonomic seats (often air suspended). There are a few possible cab configurations:
- cab over engine (COE)or flat nose, where the driver is seated on top of the front axle and the engine. This design is almost ubiquitous in Europe, where overall truck lengths are strictly regulated. They were common in the United States, but lost prominence when permitted length was extended in the early 1980s. To access the engine, the whole cab tilts forward, earning this design the name of tilt-cab. design
- conventional cabs are the most common in North America. The driver is seated behind the engine, as in most passenger cars or pickup trucks. Conventionals are further divided into large car and aerodynamic designs. A large car or long nose is a conventional truck with a long—6 to 8 foot (1.8 to 2.4 m) or more—hood. With their very square shapes, these trucks offer a lot of wind resistance and can consume more fuel. They also offer poorer visibility than their aerodynamic or COE counterparts. By constrast, Aerodynamic cabs are very streamlined, with a sloped hood and other features to lower drag. Most owner-operators prefer the square-hooded conventionals, it has something to do with "Take pride in your ride".
- cab beside engine designs also exist, but are rather rare.
- Slang terms
  - "Tiltin' Hilton" :Cab-over with a sleeper berth.
  - "Aardvark" : The aerodynamically designed conventional.
  - "Hood" : Any conventional that is NOT an "aardvark"

Engine

Trucks can use all sorts of engines. Small trucks such as SUVs or pickups, and even light medium-duty trucks in North America will use gasoline engines. Most heavier trucks use four stroke turbo intercooler diesel engines, although there are alternatives. Huge off-highway trucks use locomotive-type engines such as a V12 Detroit Diesel two stroke engine. In the United States, highway trucks almost always use an engine built by a third party, such as CAT, Cummins, or Detroit Diesel. The only exceptions to this are Volvo Trucks and Mack Trucks, which are available with Volvo and Mack diesel engines, respectively, and Freightliner, which is a subsidiary of DaimlerChrysler and are available with Mercedes-Benz and Detroit Diesel engines.

Drivetrain

Small trucks use the same type of transmissions as cars. Bigger trucks often use manual transmissions, which must be built stronger to withstand the torque their engines make. Common North American setups include 10, 13 and 18 speeds. Automatic transmissions for heavy trucks are becoming more and more common, due to advances both in transmission and engine power. The trend in Europe is that more new trucks are being bought with automatic transmissions. This may be due in part to lawsuits from drivers claiming that driving a manual transmission is damaging to their knees.

Quality and sales

Quality among all heavy truck manufacturers in general is improving, however industry insiders will testify that the industry has a long way to go before they achieve the quality levels reached by automobile manufacturers. Part of the reason for this is that 75% of all trucks are custom specified. This works against efforts to streamline and automate the assembly line.

Heavy trucks market worldwide

(major manufacturers ranked by 2003 sales)
- DaimlerChrysler Commecial Vehicles
- Volvo Global Trucks
- Iveco
- PACCAR
- Hino
- MAN Nutzfahrzeuge
- Navistar
- Fuso
- Scania
- Nissan Diesel The worldwide market share leader is DaimlerChrysler, with its Mercedes-Benz' commercial vehicle group with around a 22% global market share. Mercedes-Benz commercial vehicle’s, with its Freightliner, Mercedes-Benz, Setra, Sterling (the old Ford Trucks), Western Star, Mitsubishi Fuso Truck and Bus (43%; Japan), and Hyundai Trucks (50%; South Korea), sold between 200,000 and a quarter of a million units worldwide that past few years. [http://www.worldmarketsanalysis.com/wma_sample_pages/site_pages/WMASampTruck.htm]

United States

Smaller fleet operators, specialized carriers, and owner operators tend to prefer Mack or Peterbilt and Kenworth products. Larger fleet operators and public agencies tend to prefer the lower cost Freightliners, Navistar, and Ford products. There are also regional preferences with truck drivers within the United States. On the East Coast, where routes where traditionally shorter, and because the trucks were made there, many drivers preferred Mack Trucks. While on the West Coast, the drivers preferred Peterbilt, Kenworth, and Freightliner. White, built a new factory in California in the early 1960s, with long-haul trucking company Consolidated Freightways. The entity, which became White-Freightliner, then just Freightliner, catered directly to western fleets that wanted a lighter-aluminium cab and frame, and traveled longer-straighter distances without stopping. Drivers more concerned with safety than with fuel-economy preferred the heavier Peterbilts and Kenworths. But, Kenworth and Peterbilt, which had started out as heavy-duty trucks for hauling logs, forest products, and steel for shipyards on the West Coast, readily saw the need for these lighter long-distance trucks.

Europe

Iveco, MAN AG, Mercedes-Benz Trucks, PACCAR (DAF Trucks, Leyland Trucks), Scania AB, and Volvo Trucks (not to be confused with Volvo Automotive, which is now part of Ford Motor Company), are the leading truck manufacturers in Western Europe. In the Eastern Europe, Škoda, Tatra and GAZ are common, since they were some of the "brands" of the Soviet controlled areas.

Asia

Heavy truck leading manufacturers (alphabetically]
- Dong Feng (China)
- Mitsubishi (Japan)
- Telco
- Hino (Japan)(Joint ventures with Scania and Renault)
- Isuzu
- Iveco (Italy, but local divisions in Asia)
- Nissan Diesel

South America

Registrations of heavy trucks in South America (2002; % breakdown by manufacturer):
- DaimlerChrysler
- Scania
- Mack Trucks

References

Conduire un véhicule lourd, Société de l'Assurance Automobile du Québec, 7e édition, 2002 ISBN 2-551-19567-5

See also


- Forklift
- List of truck types
- Scania AB
- Volvo Trucks
- Semi-trailer - a US English term, this article covers large trucks such as road trains and articulated lorries
- Truck and trailer bodies
- Trucker
- cutaway van chassis

External links


- [http://truckingtime.com/ Trucking Time - Trucking Magazine]
- [http://truckingtime.com/motor-freight-trucking-article-62.html Motor Freight Classifications]
- [http://perso.wanadoo.fr/site.panhard/History.htm Early history of Panhard and Levassor]
- [http://www.cms.daimlerchrysler.com/emb_classic/0,,0-195-78765-1-84546-1-0-0-0-0-0-434-78641-0-0-0-0-0-0-1,00.html Gottlieb Daimler's first truck] ja:貨物自動車 Category:Commercial item transport and distribution

Bus

:This article is about the form of transport. See computer bus or electrical bus for the use of the term in computing and electronics respectively, the bank of the united states (the B.U.S.), or places like Bus, Pas-de-Calais and Bus-Saint-Rémy. Bus-Saint-Rémy competition. Other cities felt they could not compete against Honolulu.]] A bus is a large, motorized, wheeled vehicle intended to carry numerous persons in addition to the driver. The name is a shortened version of omnibus, which means "for everyone".

History

The omnibus, the first organized public transit system, may have originated in Nantes, France in 1826, when a retired army officer who had built public baths on the city's edge set up a short stage line between the center of town and his baths. When he discovered that passengers were just as interested in getting off at intermediate points as in patronizing his baths, he shifted the stage line's focus. His new voiture omnibus ("carriage for all") combined the functions of the hired hackney carriage with the stagecoach that travelled a predetermined route from inn to inn, carrying passengers and mail. His omnibus featured wooden benches that ran down the sides of the vehicle; entry was from the rear. Whether by direct emulation, or because the idea was in the air, by 1832 the idea had been copied in Paris, Bordeaux and Lyons. A London newspaper reported in July 4, 1829 that “the new vehicle, called the omnibus, commenced running this morning from Paddington to the City”. This bus service was operated by George Shillibeer. In New York, omnibus service began in the same year, when Abraham Brower, an entrepreneur who had organized volunteer fire companies, established a route along Broadway starting at Bowling Green. Other American cities soon followed suit: Philadelphia in 1831, Boston in 1835 and Baltimore in 1844. In most cases, the city governments granted a private company—generally a small stableman already in the livery or freight-hauling business—an exclusive franchise to operate public coaches along a specified route. In return, the company agreed to maintain certain minimum levels of service—though one of these standards was not upholstery. The New York omnibus quickly moved into the urban consciousness. In 1831, New Yorker Washington Irving remarked of Britain's Reform Act (finally passed in 1832): "The great reform omnibus moves but slowly." Reform Act).]] The omnibus had many repercussions for society, particularly in that it encouraged urbanization. Socially, the omnibus put city-dwellers, even if for only half an hour, into previously-unheard-of physical intimacy with strangers, squeezing them together knee-to-knee (illustration, left). Only the very poor remained excluded. A new division in urban society now came to the fore, dividing those who kept carriages from those who did not. The idea of the "carriage trade", the folk who never set foot in the streets, who had goods brought out from the shops for their appraisal, has its origins in the omnibus crush. urbanization] The omnibus also extended the reach of the North Atlantic post-Georgian, post-Federal city. The walk from the former village of Paddington to the business heart of London in the "City" was a brisk one for a young man in good condition. The omnibus offered the nearer suburbs more access to the inner city. More intense urbanization was to follow. Within a very few years, the New York omnibus had a rival in the streetcar: the first streetcar ran along The Bowery, which offered the excellent improvement in amenity of riding on smooth iron rails rather than clattering over granite setts, called "Belgian blocks". The new streetcars were financed by John Mason, a wealthy banker, and built by an Irish contractor, John Stephenson. The streetcars would become even more centrally important than the omnibus in the future of urbanization. When motorized transport proved successful after ca 1905, a motorized omnibus was for a time sometimes called an autobus.

Types

granite granite]] granite granite granite]] granite
- Coach / Motorcoach
- Double-decker bus
- Articulated bus
- Low-floor
- Midibus
- Minibus
- Trolleybus
- Gyrobus
- Guided bus
- Shuttle bus
- School bus

Manufacture and Manufacturers

See :Category:Bus manufacturers and :Category:Busses.

Bus line operators

See: List of bus companies.

Types of bus service

Buses are an intrinsic part of everyday life, and play an important part in the social fabric of many countries.

Intercity travel

Intercity bus services have become an important travel connection to smaller towns and rural areas in the United States that do not have airports or train service. A new phenomenon in intercity bus travel has been the Chinatown bus.

Tourism

Some places have buses that resemble streetcars in order to attract tourists or otherwise look nice (see right). A similar phenomenon is Duck Tours, which uses DUKWs converted into buses/cruise boats for tour purposes.

Buses in a social context

Desegregation busing

In some areas of the United States, a forced busing system has been used to achieve racial desegregation of public schools. Under a busing plan, children do not necessarily go to the nearest school geographically, but to such a school where there is an appropriate mix of racial diversity.

Buses and segregation

Bus services were also a focal point in the American Civil Rights Movement of the 1950s and 1960s in the United States. In the period after the American Civil War ended in 1865, racial segregation in public accommodations, including public transport such as rail and bus services, was enforced through Black Codes and Jim Crow laws. These were made to prevent African-Americans from doing things that a white person could do. For instance, Jim Crow laws required bus drivers to enforce separate seating sections. These laws and enforcement varied among communities and states. In 1955, after a long day of work, Rosa Parks, a black seamstress, was arrested in Montgomery, Alabama for refusing to give up her seat to a white man on a public bus, bringing attention to the injustice of differential and degrading treatment based solely upon race. This incident, boycotts of bus services, other protests, and court challenges led a U.S. Supreme Court ruling banning segregation on public buses and helped lead the U.S. Congress to the pass the landmark 1964 Civil Rights Act which clarified the unconstitutionality of public racial segregation laws.

Miscellaneous

The usual plural of bus is "buses". "Busses" is sometimes used, but is also the plural of "buss", a dialectal word for "kiss" or a type of boat. In 1955, after a long day of work, Rosa Parks, a black seamstress, was arrested in Montgomery, Alabama for refusing to give up her seat to a white man on a public bus, bringing attention to the injustice of differential and degrading treatment based solely upon race. This incident, boycotts of bus services, other protests, and court challenges led a U.S. Supreme Court ruling banning segregation on public buses and helped lead the U.S. Congress to the pass the landmark 1964 Civil Rights Act which clarified the unconstitutionality of public racial segregation laws. The bus involved in the Rosa Parks incident has been found and restored and is now on display at the Henry Ford Museum near Detroit Michigan.

See also


- Public transport
- Bus rapid transit
- Busway
- Bus stop
- Bus spotting
- Night bus
- Streetcar
- Training bus
- General Motors streetcar conspiracy
- Colectivo (Historically improvised buses of Buenos Aires)

External links


- [http://www.natransit.com Hobby site about buses and trains in North America]
- [http://www.busesintl.com/May_2003.htm Busway programs in the Netherlands, bi-articulated bus]
- [http://www.quinion.com/words/articles/omnibus.htm "A word for all: the odd history of "omnibus""]
- [http://www.public-transport.net Buses in Europe]
- [http://www.barraclou.com/bus Barraclou.com - Bus]

References


- Category:Bus transport Category:Passenger equipment zh-min-nan:Kong-chhia ko:버스 ja:バス (交通機関) simple:Bus

Automobile

An automobile is a wheeled vehicle that carries its own motor. Different types of automobiles include cars, buses, trucks, jeeps, and vans, with cars being the most popular. The term is derived from Greek 'autos' (self) and Latin 'movére' (move), referring to the fact that it 'moves by itself'. Earlier terms for automobile include 'horseless carriage' and 'motor car'. An automobile has seats for the driver and, almost without exception, one or more passengers. It is the main source of transportation across the world. In 2005 there are 500 million cars worldwide (0.07 per capita), of which 220 million are located in the United States (0.75 per capita).

History

:Main article: History of the automobile Steam-powered self-propelled vehicles were devised in the late 18th century. The first self-propelled car was built by Nicolas-Joseph Cugnot in 1769—it could attain speeds of up to 6 km/h. In 1771 he designed another steam-driven engine, which ran so fast that it rammed into a wall, producing the world’s first car accident. In 1807 Francois Isaac de Rivaz designed the first internal combustion engine (sometimes abbreviated "ICE" today). He subsequently used it to develop the world’s first vehicle to run on such an engine, one that used a mixture of hydrogen and oxygen to generate energy. This spawned the birth of a number of designs based on the internal combustion engine in the early nineteenth century with little or no degree of commercial success. In 1860 thereafter, Jean Joseph Etienne Lenoir built the first successful two-stroke gas driven engine. In 1862 he again built an experimental vehicle driven by his gas-engine, which ran at a speed of 3 km/h. These cars became popular and by 1865 could be frequently seen on the roads. The first American automobiles with gasoline-powered internal combustion engines were completed in 1877 by George Baldwin Selden of Rochester, New York, who applied for a patent on the automobile in 1879. Selden received his patent and later sued the Ford Motor company for infringing his patent. Henry Ford was notoriously against the American patent system, and Selden's case against Ford went all the way to the Supreme Court, who ruled that Ford had to pay a penalty to Selden, but could continue manufacturing automobiles, because the technology had changed quite a bit by that time. Later on, in Germany, automobiles were developed almost simultaneously in 1886 by German inventors working independently: Carl Benz on 3 July 1886 in Mannheim, Gottlieb Daimler and Wilhelm Maybach in Stuttgart (also inventors of the first motor bike) and in 1888/89 German - Austrian inventor Siegfried Marcus in Vienna. Meanwhile, notable advances in steam power evolved in Birmingham, England by the Lunar Society. It was here that the term horsepower was first used. It was in Birmingham also that the first British four wheel petrol-driven automobiles were built in 1895 by Frederick William Lanchester who also patented the disc brake in the city. Electric vehicles were produced by a small number of manufacturers.

Innovation

Electric vehicle from the 1950s]] The first automobile patent in the United States was granted to Oliver Evans in 1789; in 1804 Evans demonstrated his first successful self-propelled vehicle, which not only was the first automobile in the USA but was also the first amphibious vehicle, as his steam-powered vehicle was able to travel on wheels on land and via a paddle wheel in the water. On November 5, 1895, George B. Selden was granted a United States patent for a two-stroke automobile engine (). This patent did more to hinder than encourage development of autos in the USA. A major breakthrough came with the historic drive of Bertha Benz in 1888. Steam, electric, and gasoline powered autos competed for decades, with gasoline internal combustion engines achieving dominance in the 1910s. 1910s] The large scale, production-line manufacturing of affordable automobiles was debuted by Oldsmobile in 1902, then greatly expanded by Henry Ford in the 1910s. Early automobiles were often referred to as 'horseless carriages', and did not stray far from the design of their predecessor. Through the period from 1900 to the mid 1920s, development of automotive technology was rapid, due in part to a huge (hundreds) number of small manufacturers all competing to gain the world's attention. Key developments included electric ignition and the electric self-starter (both by Charles Kettering, for the Cadillac Motor Company in 1910-1911), independent suspension, and four-wheel brakes. By the 1930s, most of the technology used in automobiles had been invented, although it was often re-invented again at a later date and credited to someone else. For example, front-wheel drive was re-introduced by Andre Citroën with the launch of the Traction Avant in 1934, though it appeared several years earlier in road cars made by Alvis and Cord, and in racing cars by Miller (and may have appeared as early as 1897). After 1930, the number of auto manufacturers declined sharply as the industry consolidated and matured. Since 1960, the number of manufacturers has remained virtually constant, and innovation slowed. For the most part, "new" automotive technology was a refinement on earlier work, though these refinements were sometimes so extensive as to render the original work nearly unrecognizable. The chief exception to this was electronic engine management, which entered into wide use in the 1960s, when electronic parts became cheap enough to be mass-produced and rugged enough to handle the harsh environment of an automobile. Developed by Bosch, these electronic systems have enabled automobiles to drastically reduce exhaust emissions while increasing efficiency and power.

Model changeover and design change

exhaust Cars are not merely continually perfected mechanical contrivances; since the 1920s nearly all have been mass-produced to meet a market, so marketing plans and manufacture to meet them have often dominated automobile design. It was Alfred P. Sloan who established the idea of different makes of cars produced by one firm, so that buyers could "move up" as their fortunes improved. The makes shared parts with one another so that the larger production volume resulted in lower costs for each price range. For example, in the 1950s, Chevrolet shared hood, doors, roof, and windows with Pontiac; the LaSalle of the 1930s, sold by Cadillac, used the cheaper mechanical parts made by the Oldsmobile division. He also conceived of the notion of the yearly model change-over, which became a three-year cycle. In the second year of the cycle, the superficial appearance of the cars changed incidentally; for the third, major changes took place, e.g., the fender dies for the 1957 Chevrolet had to be modified to produce thin, pointed fins and squarish headlamp housings. In the next cycle, the doors, roof, trunk, and often the suspension would have to be redesigned. Factories and the yearly work schedule had to be specialized to accommodate these changeovers. Such a patterns became dominant for the Big Three automakers in the US, though European firms neither amalgamated nor could afford the changeover. After the 1400s, when American firms tackled the technical problems of high-compression V8, automatic transmissions, and air conditioners, investment shifted to meeting the market for non-technical matters. This was criticized as "planned obsolescence," although by this it was meant that the car would simply be made to go out of style rather than really being technically surpassed. For example, only those few American cars of the 1960s with front-wheel drive or a rear engine had a fully independent rear suspension because the Hotchkiss drive was cheaper, and people were used to it. Such malinvestment left American firms unprepared for the Oil Crisis of the 1970s and the rise of imported luxury cars in the 1980s.

Regulation

In almost every nation, laws have been enacted governing the operation of motor vehicles. Most of this legislation, including limits on allowable speed and other rules of the road, are designed to ensure the smooth flow of traffic and simultaneously protect the safety of vehicle occupants, cyclists, and pedestrians. In 1965, in the U.S. state of California, state legislation was introduced to regulate exhaust emissions, the first such legislation in the world. Answering this new interest in environmental and public safety issues, the Department of Transportation (DOT) and the Environmental Protection Agency (EPA) both introduced legislation in 1968 which substantially altered the course of automotive development. Since the US market was the largest in the world (and California the largest market in the US), manufacturers worldwide were forced to adapt. For the first time, safety devices were mandatory, as were controls on harmful emissions. Prior to this legislation, even seat belts were considered extra-cost options by many manufacturers. Other countries followed by introducing their own safety and environmental legislation. In time, meeting regulations became the main challenge for the engineers designing new cars. In the decade from 1975 to 1985, the world's manufacturers struggled to meet the new regulations, some producing substandard cars with reduced reliability as a result. However, by the end of this period, everyone had learned how to handle the newly regulated environment. The manufacturers discovered that safety and environmentalism sold cars, and some began introducing environmental and safety advances on their own initiative.

Environmental improvements

The automobile was hailed as an environmental improvement over horses when it was first introduced. Before its introduction, in New York City, over 10,000 tons of manure had to be removed from the streets daily. Among the first environmental advances are the so-called alternative fuels for the internal combustion engine, which have been around for many years. Early in automotive history, before gasoline was widely available at corner pumps, cars ran on many fuels, including kerosene (paraffin) and coal gas. Alcohol fuels were used in racing cars before and just after World War II. Today, methanol and ethanol are used as petrol extenders in some countries, notably in Australia and the United States. In countries with warmer climates, such as Brazil, alcohol derived from sugar cane is often used as a substitute fuel. In many countries, plentiful supplies of natural gas have seen methane sold as compressed natural gas (CNG) and propane sold as liquified petroleum gas (LPG) alongside petrol and diesel fuels since the 1970s. While a standard automotive engine will run on these fuels with very low exhaust emissions, there are some performance differences, notably a loss of power due to the lower energy content of the alternative fuels. The need to equip filling stations and vehicles with pressurized vessels to hold these gaseous fuels and more stringent safety inspections, means that they are only economical when used for a long distance, or if there are installation incentives. They are most economical where petrol has high taxes and the alternative fuels do not.

Alternative fuels and batteries

With heavy taxes on fuel, particularly in Europe and tightening environmental laws, particularly in California, and the possibility of further restrictions on greenhouse gas emissions, work on alternative power systems for vehicles continues. Diesel-powered cars can run with little or no modification on 100% pure biodiesel, a fuel that can be made from vegetable oils. Many cars that currently use gasoline can run on ethanol, a fuel made from plant sugars. Most cars that are designed to run on gasoline are capable of running with 15% ethanol mixed in, and with a small amout of redesign, gasoline-powered vehicles can run on ethanol concentrations as high as 85%. All petrol fueled cars can run on LPG. There has been some concern that the ethanol-gasoline mixtures prematurely wear down seals and gaskets. Further, the use of higher levels of alcohol require that the automobile carry/use twice as much. Therefore, if your vehicle is capable of 300 miles on a 15-gallon tank, the efficiency is reduced to approximately 150 miles. Of course, certain measures are available to increase this efficiency, such as different camshaft configurations, altering the timing/spark output of the ignition, or simply, using a larger fuel tank. In the United States, alcohol fuel was produced in corn-alcohol stills until Prohibition criminalized the production of alcohol in 1919. Brazil is the only country which produces ethanol-running cars, since the late 1970s. Attempts at building viable battery-powered electric vehicles continued throughout the 1990s (notably General Motors with the EV1), but cost, speed and inadequate driving range made them uneconomical. Battery powered cars have used lead-acid batteries which are greatly damaged in their recharge capacity if discharged beyond 75% on a regular basis and NiMH batteries. Current research and development is centered on "hybrid" vehicles that use both electric power and internal combustion. The first hybrid vehicle available for sale in the USA was the Honda Insight. As of 2005, The car is still in production and achieves around 60 mpg. Other R&D efforts in alternative forms of power focus on developing fuel cells, alternative forms of combustion such as GDI and HCCI, and even the stored energy of compressed air (see Air Engine).

Safety

Automobiles were a significant improvement in safety on a per passenger mile basis, over the horse based travel that they replaced. Millions have been able to reach medical care much more quickly when transported by ambulance. Accidents seem as old as automobile vehicles themselves. Joseph Cugnot crashed his steam-powered "Fardier" against a wall in 1770. The first recorded automobile fatality was Bridget Driscoll on August 17, 1896 in London and the first in the United States was Henry Bliss on September 13, 1899 in New York City. Worldwide, every year more than a million people are killed and about 50 million people are wounded in collisions (according to WHO estimates). Cars also cause innumerable injuries and deaths among millions of animals (see roadkill). Major factors in accidents include the use of alcohol or other drugs, inattentiveness, the use of handheld mobile phones, tiredness, road hazards such as snow, potholes, and animals, and recklessness. Special safety features have been built into cars for years, some for the safety of car's occupants only, some for the safety of others. Cars have two basic safety problems: They have human drivers who make mistakes, and the wheels lose traction near a half gravity of deceleration. Automated control has been seriously proposed and successfully prototyped. Shoulder-belted passengers could tolerate a 32G emergency stop (reducing the safe intervehicle gap 64-fold) if high-speed roads incorporated a steel rail for emergency braking. Both safety modifications of the roadway are thought to be too expensive by most funding authorities, although these modifications could dramatically increase the number of vehicles that could safely use a high-speed highway. Early safety research focused on increasing the reliability of brakes and reducing the flammability of fuel systems. For example, modern engine compartments are open at the bottom so that fuel vapors, which are heavier than air, vent to the open air. Brakes are hydraulic so that failures are slow leaks, rather than abrupt cable breaks. Systematic research on crash safety started in 1958 at Ford Motor Company. Since then, most research has focused on absorbing external crash energy with crushable panels and reducing the motion of human bodies in the passenger compartment. There are standard tests for safety in new automobiles, like the EuroNCAP and the [http://www.nhtsa.dot.gov/cars/testing/ncap/ US NCAP] tests. There are also tests run by organizations such as [http://www.hwysafety.org/ IIHS] and backed by the insurance industry. Despite technological advances, there is still significant loss of life from car accidents: About 40,000 people die every year in the US, with similar trends in Europe. This figure increases annually in step with rising population and increasing travel, but the rate per capita and per mile travelled decreases steadily. The death toll is expected to nearly double worldwide by 2020. A much higher number of accidents result in injury or permanent disability.

Future of the car

There will always be a strong demand for the door-to-door, on-demand service but there are likely to be radical changes in the cars of the future.

See also


- Effects of the automobile on societies
- List of automobile manufacturers
- List of recent automobile models by type
- U.S. Automobile Production Figures
- Car dealership
- Car handling
- Car safety
- Unsafe at Any Speed by Ralph Nader
- Crash test dummy
- Car washing techniques
- List of automotive superlatives, Lists of automobiles for a structured list.
- List of automotive packages (cosmetic and functional features sold as a group)
- Road traffic accident

Major possible subsystems


- engine
  - carburetor or fuel injection
  - fuel pump
  - engine configuration: Wankel or reciprocating (V, inline, flat).
  - engine management systems
  - exhaust system
  - ignition system
  - self starter
  - emissions control devices
  - turbochargers and superchargers
  - front engine
  - rear engine
  - mid engine
- Ancillary power - mechanical, electrical, hydraulic, vacuum, air
- drivetrain
  - transmission (gearbox)
    - manual transmission
    - semi-automatic transmission
    - fully-automatic transmission
  - Layout
    - FF layout
    - FR layout
    - MR layout
    - RR layout
  - Drive Wheels
    - 2 wheel drive
    - 4 wheel drive
    - Front wheel drive
    - Rear wheel drive
    - All wheel drive
  - differential
    - limited slip differential
  - axle
  - Live axle
- brakes
  - disc brakes
  - drum brakes
  - anti-lock braking systems (ABS)
- wheels and tires
  - custom wheels
- steering
  - rack and pinion
  - Ackermann steering geometry
  - Caster angle
  - Camber angle
  - Kingpin
- suspension
  - MacPherson strut
  - wishbone
  - double wishbone
  - multi-link
  - torsion beam
  - semi-trailing arm
  - axle
- body
  - crumple zones
  - monocoque (or unibody) construction
  - suicide doors
  - spoiler
- interior equipment
  - passive safety
    - seat belts
    - airbags
    - child safety locks
  - dashboard
  - shifter for selecting gear ratios
  - ancillary equipment such as stereos, air conditioning, cruise control, car phones, positioning systems, cup holders, etc.
- exterior equipment
  - windows
    - Power window
    - windshield
    - Daytime running lamps

External links


- [http://www.dmv.org/ Department of Motor Vehicles]
- [http://www.automotivehistory.net/ A brief history of the automotive form]
- [http://www.autoweek.com/ Autoweek.com]
- [http://www.detnews.com/autosinsider/index.htm Auto Insider]
- [http://www.edmunds.com/ Edmunds.com]
- [http://www.kbb.com/ Kelley Blue Book]
- [http://www.hwysafety.org/ Insurance Institute for Highway Safety]
- [http://nhtsa.gov/ NHTSA.gov]
- [http://www.naftc.wvu.edu/ Alternative Fuel Vehicle Training]
- [http://supercarnews.com/ Car Images and Info]
- [http://www.netcarshow.com/ NetCarShow.com] - Archive of car pictures
- ko:자동차 ms:Kereta ja:自動車 simple:Car th:รถยนต์

Animal

:For the Muppet Show character, see Animal (Muppet). For the professional wrestler, see Joseph Laurinaitis.

    - Porifera (sponges)
    - Ctenophora (comb jellies)
    - Cnidaria (coral, jellyfish, anenomes)
    - Placozoa (trichoplax)
- Subregnum Bilateria (bilateral symmetry)
    - Acoelomorpha (basal)
    - Orthonectida (flatworms, echinoderms, etc.)
  - Rhombozoa (dicyemids)
  - Myxozoa (slime animals)
  - Superphylum Deuterostomia (blastopore becomes anus)
    - Chordata (vertebrates, etc.)
    - Hemichordata (acorn worms)
    - Echinodermata (starfish, urchins)
    - Chaetognatha (arrow worms)
  - Superphylum Ecdysozoa (shed exoskeleton)
    - Kinorhyncha (mud dragons)
    - Loricifera
    - Priapulida (priapulid worms)
    - Nematoda (roundworms)
    - Nematomorpha (horsehair worms)
    - Onychophora (velvet worms)
    - Tardigrada (water bears)
    - Arthropoda (insects, etc.)
  - Superphylum Platyzoa
    - Platyhelminthes (flatworms)
    - Gastrotricha (gastrotrichs)
    - Rotifera (rotifers)
    - Acanthocephala (acanthocephalans)
    - Gnathostomulida (jaw worms)
    - Micrognathozoa (limnognathia)
    - Cycliophora (pandora)
  - Superphylum Lophotrochozoa (trochophore larvae / lophophores)
    - Sipuncula (peanut worms)
    - Nemertea (ribbon worms)
    - Phoronida (horseshoe worms)
    - Ectoprocta (moss animals)
    - Entoprocta (goblet worms)
    - Brachiopoda (brachipods)
    - Mollusca (mollusks)
    - Annelida (segmented worms) Animals are a major group of organisms, classified as the kingdom Animalia or Metazoa. In general they are multicellular, capable of locomotion and responsive to their environment, and feed by consuming other organisms. Their body plan becomes fixed as they develop, usually early on in their development as embryos, although some undergo a process of metamorphosis later on. Along with sponges, gastropods, emus, dolphins and all other animals, Homo sapiens sapiens meet all the criteria above for membership in the group of organisms known as animals and they do not meet the criteria of the other groups. Some humans often consider themselves separate from animals, not on the grounds of biology, but through the use of "other contexts". Whilst self-delusion may be a unique characteristic of the human species it is not cause for exclusion from the Kingdom Animalia. The name animal comes from the Latin word animal, of which animalia is the plural, and ultimately from anima, meaning vital breath or soul.

Characteristics

Aristotle divided the living world between animals and plants, and this was followed by Carolus Linnaeus in the first hierarchical classification. Since then biologists have begun emphasizing evolutionary relationships, and so these groups have been restricted somewhat. For instance, microscopic protozoa were originally considered animals because they move, but are now treated separately. Kingdom Animalia has several characteristics that set it apart from other living things. First, animals are eukaryotic. This separates them from the Kingdom Monera. Second, animals are multicellular, which separates them from Kingdom Protista. Third, they are heterotrophic, setting them apart from Kingdom Plantae and several plant-like protists. Finally, Kingdom Animalia consists of organisms without cell walls, which makes it unique compared to Kingdom Plantae, algae, and Kingdom Fungi.

Structure

With a few exceptions, most notably the sponges (Phylum Porifera), animals have bodies differentiated into separate tissues. These include muscles, which are able to contract and control locomotion, and a nervous system, which sends and processes signals. There is also typically an internal digestive chamber, with one or two openings. Animals with this sort of organization are called metazoans, or eumetazoans when the former is used for animals in general. All animals have eukaryotic cells, surrounded by a characteristic extracellular matrix composed of collagen and elastic glycoproteins. This may be calcified to form structures like shells, bones, and spicules. During development it forms a relatively flexible framework upon which cells can move about and be reorganized, making complex structures possible. In contrast, other multicellular organisms like plants and fungi have cells held in place by cell walls, so develop by progressive growth. Also, unique to animal cells are the following intercellular junctions: tight junctions, gap junctions, and desmosomes.

Reproduction and development

Nearly all animals undergo some form of sexual reproduction. Adults are diploid or occasionally polyploid. They have a few specialized reproductive cells, which undergo meiosis to produce smaller motile spermatozoa or larger non-motile ova. These fuse to form zygotes, which develop into new individuals. Many animals are also capable of asexual reproduction. This may take place through parthenogenesis, where fertile eggs are produced without mating, or in some cases through fragmentation. A zygote initially develops into a hollow sphere, called a blastula, which undergoes rearrangement and differentiation. In sponges, blastula larvae swim to a new location and develop into a new sponge. In most other groups, the blastula undergoes more complicated rearrangement. It first invaginates to form a gastrula with a digestive chamber, and two separate germ layers - an external ectoderm and an internal endoderm. In most cases, a mesoderm also develops between them. These germ layers then differentiate to form tissues and organs. Animals grow by indirectly using the energy of sunlight. Plants use this energy to turn air into simple sugars using a process known as photosynthesis. These sugars are then used as the building blocks which allow the plant to grow. When animals eat these plants (or eat other animals which have eaten plants), the sugars produced by the plant are used by the animal. They are either used directly to help the animal grow, or broken down, releasing stored solar energy, and giving the animal the energy required for motion. This process is known as glycolysis.

Origin and fossil record

Animals are generally considered to have evolved from flagellate protozoa. Their closest living relatives are the choanoflagellates, collared flagellates that have the same structure as certain sponge cells do. Molecular studies place them in a supergroup called the opisthokonts, which also include the fungi and a few small parasitic protists. The name comes from the posterior location of the flagellum in motile cells, such as most animal sperm, whereas other eukaryotes tend to have anterior flagella. The first fossils that might represent animals appear towards the end of the Precambrian, around 600 million years ago, and are known as the Vendian biota. These are difficult to relate to later fossils, however. Some may represent precursors of modern phyla, but they may be separate groups, and it is possible they are not really animals at all. Aside from them, most animal phyla with known phyla make a more or less simultaneous appearance during the Cambrian period, about 570 million years ago. It is still disputed whether this event, called the Cambrian explosion, represents a rapid divergence between different groups or a change in conditions that made fossilization possible.

Groups of animals

The sponges (Porifera) diverged from other animals early. As mentioned, they lack the complex organization found in most other phyla. Their cells are differentiated, but not organized into distinct tissues. Sponges are sessile and typically feed by drawing in water through pores all over the body, which is supported by a skeleton typically divided into spicules. The extinct Archaeocyatha, which have fused skeletons, may represent sponges or a separate phylum. Among the eumetazoan phyla, two are radially symmetric and have digestive chambers with a single opening, which serves as both the mouth and the anus. These are the Cnidaria, which include anemones, corals, and jellyfish, and the Ctenophora or comb jellies. Both have distinct tissues, but they are not organized into organs. There are only two main germ layers, the ectoderm and endoderm, with only scattered cells between them. As such, these animals are sometimes called diploblastic. The tiny phylum Placozoa is similar, but individuals do not have a permanent digestive chamber. The remaining animals form a monophyletic group called the Bilateria. For the most part, they are bilaterally symmetric, and often have a specialized head with feeding and sensory organs. The body is triploblastic, i.e. all three germ layers are well-developed, and tissues form distinct organs. The digestive chamber has two openings, a mouth and an anus, and there is also an internal body cavity called a coelom or pseudocoelom. There are exceptions to each of these characteristics, however - for instance adult echinoderms are radially symmetric, and certain parasitic worms have extremely simplified body structures. Genetic studies have considerably changed our understanding of the relationships within the Bilateria. Most appear to belong to four major lineages: # Deuterostomes # Ecdysozoa # Platyzoa # Lophotrochozoa In addition to these, there are a few small groups of bilaterians with relatively similar structure that appear to have diverged before these major groups. These include the Acoelomorpha, Rhombozoa, and Orthonectida. The Myxozoa, single-celled parasites that were originally considered Protozoa, are now believed to have developed from the Bilateria as well.

Deuterostomes

Deuterostomes differ from the other Bilateria, called protostomes, in several ways. In both cases there is a complete digestive tract. However, in protostomes the initial opening (the archenteron) develops into the mouth, and an anus forms separately. In deuterostomes this is reversed. In most protostomes cells simply fill in the interior of the gastrula to form the mesoderm, called schizocoelous development, but in deuterostomes it forms through evagination of the endoderm, called enterocoelic pouching. Deuterostomes also have a dorsal, rather than a ventral, nerve chord and their embryos undergo different cleavage. All this suggests the deuterostomes and protostomes are separate, monophyletic lineages. The main phyla of deuterostomes are the Echinodermata and Chordata. The former are radially symmetric and exclusively marine, such as sea stars, sea urchins, and sea cucumbers. The latter are dominated by the vertebrates, animals with backbones. These include fish, amphibians, reptiles, birds, and mammals. In addition to these, the deuterostomes also include the Hemichordata or acorn worms. Although they are not especially prominent today, the important fossil graptolites may belong to this group. The Chaetognatha or arrow worms may also be deuterostomes, but this is less certain.

Ecdysozoa

The Ecdysozoa are protostomes, named after the common trait of growth by moulting or ecdysis. The largest animal phylum belongs here, the Arthropoda, including insects, spiders, crabs, and their kin. All these organisms have a body divided into repeating segments, typically with paired appendages. Two smaller phyla, the Onychophora and Tardigrada, are close relatives of the arthropods and share these traits. The ecdysozoans also include the Nematoda or roundworms, the second largest animal phylum. Roundworms are typically microscopic, and occur in nearly every environment where there is water. A number are important parasites. Smaller phyla related to them are the Nematomorpha or horsehair worms, which are visible to the unaided eye, and the Kinorhyncha, Priapulida, and Loricifera, which are all microscopic. These groups have a reduced coelom, called a pseudocoelom. The remaining two groups of protostomes are sometimes grouped together as the Spiralia, since in both embryos develop with spiral cleavage.

Platyzoa

The Platyzoa include the phylum Platyhelminthes, the flatworms. These were originally considered some of the most primitive Bilateria, but it now appears they developed from more complex ancestors. A number of parasites are included in this group, such as the flukes and tapeworms. Flatworms lack a coelom, as do their closest relatives, the microscopic Gastrotricha. The other platyzoan phyla are microscopic and pseudocoelomate. The most prominent are the Rotifera or rotifers, which are common in aqueous environments. They also include the Acanthocephala or spiny-headed worms, the Gnathostomulida, Micrognathozoa, and possibly the Cycliophora. These groups share the presence of complex jaws, from which they are called the Gnathifera.

Lophotrochozoa

The Lophotrochozoa include two of the most successful animal phyla, the Mollusca and Annelida. The former includes animals such as snails, clams, and squids, and the latter comprises the segmented worms, such as earthworms and leeches. These two groups have long been considered close relatives because of the common presence of trochophore larvae, but the annelids were considered closer to the arthropods, because they are both segmented. Now this is generally considered convergent evolution, owing to many morphological and genetic differences between the two phyla. The Lophotrochozoa also include the Nemertea or ribbon worms, the Sipuncula, and several phyla that have a fan of cilia around the mouth, called a lophophore. These were traditionally grouped together as the lophophorates, but it now appears they are paraphyletic, some closer to the Nemertea and some to the Mollusca and Annelida. They include the Brachiopoda or lamp shells, which are prominent in the fossil record, the Entoprocta, the Phoronida, and possibly the Ectoprocta or moss animals.

History of classification

In Linnaeus' original scheme, the animals were one of three kingdoms, divided into the classes of Vermes, Insecta, Pisces, Amphibia, Aves, and Mammalia. Since then the last four have all been subsumed into a single phylum, the Chordata, whereas the various other forms have been separated out. The above lists represent our current understanding of the group, though there is some variation from source to source.

Usage of the word animal

In everyday usage animal refers to any member of the animal kingdom that is not a human being, and sometimes excludes insects (although including such arthropods as crabs). This confusion stems primarily from the familiarity with zoo animals, farm animals and pets, not from an analytical distinction between insects, humans and the rest of the animal kingdom.

Examples

Some well-known types of animals, listed by their common names:
- alpaca, ant, antelope, badger, bat, bear, bee, beetle, bird, bison, butterfly, cat, chicken, cockroach, coral, cow, deer, dinosaur, dog, dolphin, earthworm, elephant, elk, fish, fly, fox, frog, giraffe, goat, gorilla, hippopotamus, horse, human, iguana, jellyfish, kangaroo, lion, lizard, llama, lynx, monkey, mouse, nightingale, octopus, owl, ox, parrot, penguin, pig, quail, rabbit, rat, rhinoceros, salamander, scorpion, seahorse, shark, sheep, sloth, snake, spider, squid, starfish, tiger, turtle, urial, vole, whale, wolf, yak, zebra

See also


- Altruism in animals
- Amphibian
- Animal intelligence
- Animal locomotion
- Animal rights
- Biblical terms
  - Clean animals
  - Unclean animals
- Biology
- Biota
- Bird
- Fish
- Insect
- Mammal
- Macrofossil
- Prehistoric life
- Reptile
- Zoology
- Zoo

References

External links


- [http://www.animool.com/animals/index.jsp Animals Search Engine]
- [http://www.wikianimals.com wikianimals.com] - Documenting the animal kingdom
- [http://tolweb.org/tree?group=Animals&contgroup=Eukaryotes Tree of Life]
- [http://www.arkive.org A Multimedia Database of Various UK or Endangered Species]
- [http://freepages.genealogy.rootsweb.com/~wakefield/animals.html Animals and Birds Names] - Large table of words: animal, collective, male, female, young, & home
- [http://www273.pair.com/med/words/animal_adjectives.htm English Animal Adjectives]
- [http://www.georgetown.edu/faculty/ballc/animals/animals.html Sounds of the World's Animals] - animal sounds in many languages
- [http://www.findsounds.com/ FindSounds - Search the Web for Sounds] - sound files including animal sound files
- [http://www.australianfauna.com/ Australian Animals]
- [http://www.animalreviews.com AnimalReviews] - animals reviewed and evaluated
- [http://animals.timduru.org/ The animal photo archive] - Photos of animals
- [http://www.wildlife-photo.org Photo gallery of animals pictures from the entire world.]
- [http://www.wildlife-photo.org/birds_list.htm Birds Name Check List in Latin, English, Russian and Hebrew.]
- [http://www.wildanimalsonline.com Wild Animals Online] - an online encyclopedia of wild animals - facts, photos Category:Animals zh-min-nan:Tōng-bu̍t ko:동물 ms:Haiwan ja:動物 simple:Animal th:สัตว์

United States

:For alternative meanings, see the disambiguation page for US, USA, United States, or American. The United States of America is a federal democratic republic situated primarily in central North America. It comprises 50 states and one federal district, and has several territories. It is also referred to, with varying formality, as the United States, the U.S., the U.S.A., the States, or simply and most commonly, America. The official founding date of the United States is July 4, 1776, when the Second Continental Congress—representing thirteen British colonies—adopted the Declaration of Independence. However, the structure of the government was profoundly changed in 1788, when the states replaced the Articles of Confederation with the United States Constitution. The date on which each of the fifty states adopted the Constitution is typically regarded as the date that state "entered the Union" (became part of the United States). Since the mid-20th century, following World War II, the United States has emerged as a dominant global influence in economic, political, military, scientific, technological, and cultural affairs.

Geography and climate

The United States shares land borders with Canada (to the north) and Mexico (to the south), and territorial water boundaries with Canada, Russia, the Bahamas, and numerous smaller nations. It is otherwise bounded by the Pacific Ocean and the Bering Sea, in the west; the Arctic Ocean, in the northernmost areas; and the Atlantic Ocean, the Gulf of Mexico, and the Caribbean Sea, in the eastern and southeastern areas. Forty-eight of the states are in the single region between Canada and Mexico; this group is referred to, with varying precision and formality, as the continental or contiguous United States, sometimes abbreviated CONUS, and as the Lower 48. Alaska, which is not included in the term contiguous United States, is at the northwestern end of North America, separated from the Lower 48 by Canada. The archipelago of Hawaii is in the Pacific Ocean. The capital city, Washington, District of Columbia is a federal district located on land donated by the state of Maryland. (Virginia also donated land, but it was returned in 1847.) The United States also has overseas territories with varying levels of independence and organization. When inland water is included in the total area, only Russia and Canada are larger than the United States; if inland water is excluded, China ranks third and the U.S. ranks fourth. The United States' total area is 3,718,711 square miles (9,631,418 km²), of which land makes up 3,537,438 square miles (9,161,923 km²) and water makes up 181,273 square miles (469,495 km²). The United States' landscape is one of the most varied among those of the world's nations: among its many features are temperate forestland and rolling hills, on the east coast; mangrove, in Florida; the Great Plains, in the center of the country; the Mississippi–Missouri river system; the Great Lakes, four of the five of which are shared with Canada; the Rocky Mountains, west of the Great Plains; deserts and temperate coastal zones, west of the Rocky Mountains; and temperate rain forests, in the Pacific northwest. Alaska's tundra, and the volcanic, tropical islands of Hawaii add to the geographic diversity. Hawaii The climate varies along with the landscape, from tropical in Hawaii and southern Florida to tundra in Alaska and atop some of the highest mountains. Most of the North and East experience a temperate continental climate, with warm summers and cold winters. Most of the South experiences a subtropical humid climate with mild winters and long, hot, humid summers. Rainfall decreases markedly from the humid forests of the Eastern Great Plains to the semi-arid shortgrass prairies on the high plains abutting the Rocky Mountains. Arid deserts, including the Mojave, extend through the lowlan