An airport consists of a landing area, which comprises an aerially accessible open space including at least one operationally active surface such as a runway...
An airport is an aerodrome with extended facilities, mostly for commercial air transport. Airports often have facilities to store and maintain aircraft, and a control tower.
An airport consists of a landing area, which comprises an aerially accessible open space including at least one operationally active surface such as a runway for a plane to take off or a helipad, and often includes adjacent utility buildings such as control towers, hangars and terminals. Larger airports may have fixed-base operator services, airport aprons, taxiway bridges, air traffic control centres, passenger facilities such as restaurants and lounges, and emergency services.
An airport with a helipad for rotorcraft but no runway is called a heliport. An airport for use by seaplanes and amphibious aircraft is called a seaplane base.
An airport with a helipad for rotorcraft but no runway is called a heliport. An airport for use by seaplanes and amphibious aircraft is called a seaplane base. Such a base typically includes a stretch of open water for takeoffs and landings, and seaplane docks for tying-up.
An international airport has additional facilities for customs and passport control as well as incorporating all of the aforementioned elements above. Such airports rank among the most complex and largest of all built typologies with 15 of the top 50 buildings by floor area being airport terminals.
Most major airports provide commercial outlets for products and services. Most of these companies, many of which are internationally known brands, are located within the departure areas. These include clothing boutiques and restaurants and in the US amounted to $4.2 billion in 2015. Prices charged for items sold at these outlets are generally higher than those outside the airport. However, some airports now regulate costs to keep them comparable to “street prices”. This term is misleading as prices often match the manufacturers’ suggested retail price (MSRP) but are almost never discounted.
Apart from major fast food chains, some airport restaurants offer regional cuisine specialties for those in transit so that they may sample local food or culture without leaving the airport.
Some airport structures include on-site hotels built within or attached to a terminal building. Airport hotels have grown popular due to their convenience for transient passengers and easy accessibility to the airport terminal. Many airport hotels also have agreements with airlines to provide overnight lodging for displaced passengers.
Some street foods are regional, but many have spread beyond their region of origin. Most street foods are classed as both finger food and fast...
Street food is ready-to-eat food or drink sold by a hawker, or vendor, in a street or other public place, such as at a market or fair. It is often sold from a portable food booth, food cart, or food truck and meant for immediate consumption.
Some street foods are regional, but many have spread beyond their region of origin. Most street foods are classed as both finger food and fast food, and are cheaper on average than restaurant meals. According to a 2007 study from the Food and Agriculture Organization, 2.5 billion people eat street food every day.
Today, people may purchase street food for a number of reasons, such as convenience, to get flavourful food for a reasonable price in a sociable setting, to try ethnic cuisines, or for nostalgia.
Small fried fish were a street food in ancient Greece; however, Theophrastus held the custom of street food in low regard. Evidence of a large number of street food vendors was discovered during the excavation of Pompeii. Street food was widely consumed by poor urban residents of ancient Rome whose tenement homes did not have ovens or hearths. Here, chickpea soup with bread and grain paste were common meals. In ancient China, street food generally catered to the poor, however, wealthy residents would send servants to buy street food and bring it back for them to eat in their homes.
A traveling Florentine reported in the late 14th century that in Cairo, people brought picnic cloths made of rawhide to spread on the streets and sit on while they ate their meals of lamb kebabs, rice, and fritters that they had purchased from street vendors. In Renaissance Turkey, many crossroads had vendors selling “fragrant bites of hot meat”, including chicken and lamb that had been spit-roasted.
In 1502, Ottoman Turkey became the first country to legislate and standardize street food.
Aztec marketplaces had vendors who sold beverages such as atolli (“a gruel made from maize dough”), almost 50 types of tamales (with ingredients that ranged from the meat of turkey, rabbit, gopher, frog and fish to fruits, eggs and maize flowers), as well as insects and stews. Spanish colonization brought European food stocks like wheat, sugarcane and livestock to Peru, however, most commoners continued to primarily eat their traditional diets. Imports were only accepted at the margins of their diet, for example, grilled beef hearts sold by street vendors. Some of Lima’s 19th-century street vendors such as “Erasmo, the ‘negro’ sango vendor” and Na Aguedita are still remembered today.
During the American Colonial period, “street vendors sold oysters, roasted corn ears, fruit, and sweets at low prices to all classes.” Oysters, in particular, were a cheap and popular street food until around 1910 when overfishing and pollution caused prices to rise. Street vendors in New York City faced a lot of opposition. After previous restrictions had limited their operating hours, street food vendors were completely banned in New York City by 1707. Many women of African descent made their living selling street foods in America in the 18th and 19th centuries, with products ranging from fruit, cakes, and nuts in Savannah, to coffee, biscuits, pralines, and other sweets in New Orleans. Cracker Jack started as one of many street food exhibits at the Columbian Exposition.
Quadcopters generally use two pairs of identical fixed pitched propellers; two clockwise (CW) and two counterclockwise (CCW). These use independent variation of the speed of...
A quadcopter, also called a quadrotor helicopter or quadrotor, is a multirotor helicopter that is lifted and propelled by four rotors. Quadcopters are classified as rotorcraft, as opposed to fixed-wing aircraft, because their lift is generated by a set of rotors (vertically oriented propellers).
Quadcopters generally use two pairs of identical fixed pitched propellers; two clockwise (CW) and two counterclockwise (CCW). These use independent variation of the speed of each rotor to achieve control. By changing the speed of each rotor it is possible to specifically generate a desired total thrust; to locate for the centre of thrust both laterally and longitudinally; and to create a desired total torque, or turning force.
Quadcopters differ from conventional helicopters, which use rotors that are able to vary the pitch of their blades dynamically as they move around the rotor hub.
Quadcopters differ from conventional helicopters, which use rotors that are able to vary the pitch of their blades dynamically as they move around the rotor hub. In the early days of flight, quadcopters (then referred to either as ‘quadrotors’ or ‘helicopters’) were seen as possible solutions to some of the persistent problems in vertical flight. Torque-induced control issues (as well as efficiency issues originating from the tail rotor, which generates no useful lift) can be eliminated by counter-rotation, and the relatively short blades are much easier to construct. A number of manned designs appeared in the 1920s and 1930s. These vehicles were among the first successful heavier-than-air vertical take off and landing (VTOL) vehicles. However, early prototypes suffered from poor performance, and latter prototypes required too much pilot work load, due to poor stability augmentation and limited control authority.
In the late 2000s, advances in electronics allowed the production of cheap lightweight flight controllers, accelerometers (IMU), global positioning system and cameras. This resulted in the quadcopter configuration becoming popular for small unmanned aerial vehicles. With their small size and maneuverability, these quadcopters can be flown indoors as well as outdoors.
At a small size, quadcopters are cheaper and more durable than conventional helicopters due to their mechanical simplicity. Their smaller blades are also advantageous because they possess less kinetic energy, reducing their ability to cause damage. For small-scale quadcopters, this makes the vehicles safer for close interaction. It is also possible to fit quadcopters with guards that enclose the rotors, further reducing the potential for damage. However, as size increases, fixed propeller quadcopters develop disadvantages over conventional helicopters. Increasing blade size increases their momentum. This means that changes in blade speed take longer, which negatively impacts control. Helicopters do not experience this problem as increasing the size of the rotor disk does not significantly impact the ability to control blade pitch.
Due to their ease of construction and control, quadcopter aircraft are frequently used as amateur model aircraft projects.
Norway’s coastline is estimated at 29,000 kilometres (18,000 mi) with 1,190 fjords, but only 2,500 kilometres (1,600 mi) when fjords are excluded. A true fjord...
Geologically, a fjord or fiord is a long, narrow inlet with steep sides or cliffs, created by a glacier. There are many fjords on the coasts of Alaska, British Columbia, Chile, Greenland, Iceland, the Kerguelen Islands, New Zealand, Norway, Novaya Zemlya, Labrador, Nunavut, Newfoundland, Scotland, and Washington state.
Norway’s coastline is estimated at 29,000 kilometres (18,000 mi) with 1,190 fjords, but only 2,500 kilometres (1,600 mi) when fjords are excluded.
A true fjord is formed when a glacier cuts a U-shaped valley by ice segregation and abrasion of the surrounding bedrock. According to the standard model, glaciers formed in pre-glacial valleys with a gently sloping valley floor. The work of the glacier then left an overdeepened U-shaped valley that ends abruptly at a valley or trough end. Such valleys are fjords when flooded by the ocean. Thresholds above sea level create freshwater lakes. Glacial melting is accompanied by the rebounding of Earth’s crust as the ice load and eroded sediment is removed (also called isostasy or glacial rebound). In some cases this rebound is faster than sea level rise.
Thresholds above sea level create freshwater lakes. Glacial melting is accompanied by the rebounding of Earth’s crust as the ice load and eroded sediment is removed
Most fjords are deeper than the adjacent sea; Sognefjord, Norway, reaches as much as 1,300 m (4,265 ft) below sea level. Fjords generally have a sill or shoal (bedrock) at their mouth caused by the previous glacier’s reduced erosion rate and terminal moraine. In many cases this sill causes extreme currents and large saltwater rapids (see skookumchuck). Saltstraumen in Norway is often described as the world’s strongest tidal current. These characteristics distinguish fjords from rias (e.g. the Bay of Kotor), which are drowned valleys flooded by the rising sea. Drammensfjorden is cut almost in two by the Svelvik “ridge”, a sandy moraine that during the ice cover was under sea level but after the post-glacial rebound reaches 60 meters above the fjord.
Jens Esmark in the 19th century introduced the theory that fjords are or have been created by glaciers and that large parts of Northern Europe had been covered by thick ice in prehistory. Thresholds at the mouths and overdeepening of fjords compared to the ocean are the strongest evidence of glacial origin, and these thresholds are mostly rocky. Thresholds are related to sounds and low land where the ice could spread out and therefore have less erosive force. John Walter Gregory argued that fjords are of tectonic origin and that glaciers had a negligible role in their formation. Gregory’s views were rejected by subsequent research and publications. In the case of Hardangerfjord the fractures of the Caledonian fold has guided the erosion by glaciers, while there is no clear relation between the direction of Sognefjord and the fold pattern. This relationship between fractures and direction of fjords is also observed in Lyngen. Preglacial, tertiary rivers presumably eroded the surface and created valleys that later guided the glacial flow and erosion of the bedrock. This may in particular have been the case in Western Norway where the tertiary uplift of the landmass amplified eroding forces of rivers.
Confluence of tributatry fjords led to excavation of the deepest fjord basins. Near the very coast the typical West Norwegian glacier spread out (presumably through sounds and low valleys) and lost their concentration and reduced the glaciers’ power to erode leaving bedrock thresholds. Bolstadfjorden is 160 meters deep with a treshold of only 1.5 meters, while the 1300 meter deep Sognefjorden has a treshold around 100 to 200 meters deep. Hardangerfjord is made up of several basins separated by thresholds: The deepest basin Samlafjorden between Jonaneset (Jondal) og Ålvik with a distinct treshold at Vikingneset in Kvam.
Hanging valleys are common along glaciated fjords and U-shaped valleys. A hanging valley is a tributary valley that is higher than the main valley and were created by tributary glacier flows into a glacier of larger volume. The shallower valley appears to be ‘hanging’ above the main valley or a fjord. Often, waterfalls form at or near the outlet of the upper valley. Hanging valleys also occur under water in fjord systems. The branches of Sognefjord are for instance much shallower than the main fjord. The mouth of Fjærlandsfjord is about 400 meters deep while the main fjord is 1200 meters nearby. The mouth of Ikjefjord is only 50 meters deep while the main fjord is around 1300 meters at the same point.
An island in a river or a lake island may be called an eyot or ait, and a small island off the coast may be...
An island or isle is any piece of sub-continental land that is surrounded by water. Very small islands such as emergent land features on atolls can be called islets, skerries, cays or keys.
An island in a river or a lake island may be called an eyot or ait, and a small island off the coast may be called a holm.A grouping of geographically or geologically related islands is called an archipelago, such as the Philippines, for example.
Some places may even retain “island” in their names for historical reasons after being connected to a larger landmass by a land bridge or landfill
An island may be described as such, despite the presence of an artificial land bridge; examples are Singapore and its causeway, and the various Dutch delta islands, such as IJsselmonde. Some places may even retain “island” in their names for historical reasons after being connected to a larger landmass by a land bridge or landfill, such as Coney Island and Coronado Island, though these are, strictly speaking, tied islands. Conversely, when a piece of land is separated from the mainland by a man-made canal, for example the Peloponnese by the Corinth Canal or Marble Hill in northern Manhattan during the time between the building of the United States Ship Canal and the filling-in of the Harlem River which surrounded the area, it is generally not considered an island.
The word island derives from Middle English iland, from Old English igland (from ig or ieg, similarly meaning ‘island’ when used independently, and -land carrying its contemporary meaning; cf. Dutch eiland (“island”), German Eiland (“small island”)). However, the spelling of the word was modified in the 15th century because of a false etymology caused by an incorrect association with the etymologically unrelated Old French loanword isle, which itself comes from the Latin word insula. Old English ieg is actually a cognate of Swedish ö and German Aue, and related to Latin aqua (water).
Greenland is the world’s largest island, with an area of over 2.1 million km2, while Australia, the world’s smallest continent, has an area of 7.6 million km2, but there is no standard of size which distinguishes islands from continents, or from islets. There is a difference between islands and continents in terms of geology. Continents sit on continental lithosphere which is part of tectonic plates floating high on Earth’s mantle. Oceanic crust is also part of tectonic plates, but it is denser than continental lithosphere, so it floats low on the mantle. Islands are either extensions of the oceanic crust (e.g. volcanic islands) or geologically they are part of some continent sitting on continental lithosphere (e.g. Greenland). This holds true for Australia, which sits on its own continental lithosphere and tectonic plate.
The word camera comes from camera obscura, which means “dark chamber” and is the Latin name of the original device for projecting an image of...
A camera is an optical instrument for recording or capturing images, which may be stored locally, transmitted to another location, or both. The images may be individual still photographs or sequences of images constituting videos or movies. The camera is a remote sensing device as it senses subjects without any contact .
The word camera comes from camera obscura, which means “dark chamber” and is the Latin name of the original device for projecting an image of external reality onto a flat surface. The modern photographic camera evolved from the camera obscura. The functioning of the camera is very similar to the functioning of the human eye. The first permanent photograph was made in 1826 by Joseph Nicéphore Niépce.
All cameras use the same basic design: light enters an enclosed box through a converging lens/convex lens and an image is recorded on a light-sensitive medium
A camera works with the light of the visible spectrum or with other portions of the electromagnetic spectrum. A still camera is an optical device which creates a single image of an object or scene and records it on an electronic sensor or photographic film. All cameras use the same basic design: light enters an enclosed box through a converging lens/convex lens and an image is recorded on a light-sensitive medium(mainly a transition metal-halide). A shutter mechanism controls the length of time that light can enter the camera. Most photographic cameras have functions that allow a person to view the scene to be recorded, allow for a desired part of the scene to be in focus, and to control the exposure so that it is not too bright or too dim. A display, often a liquid crystal display (LCD), permits the user to view the scene to be recorded and settings such as ISO speed, exposure, and shutter speed.
A movie camera or a video camera operates similarly to a still camera, except it records a series of static images in rapid succession, commonly at a rate of 24 frames per second. When the images are combined and displayed in order, the illusion of motion is achieved.
The forerunner to the photographic camera was the camera obscura. Camera obscura (Latin for “dark room”) is the natural phenomenon that occurs when an image of a scene at the other side of a screen (or for instance a wall) is projected through a small hole in that screen and forms an inverted image (left to right and upside down) on a surface opposite to the opening. The oldest known record of this principle is a description by Han Chinese philosopher Mozi (ca. 470 to ca. 391 BC). Mozi correctly asserted the camera obscura image is inverted because light travels inside the camera straight lines from its source.
In the 11th century, Arab physicist Ibn al-Haytham (Alhazen) wrote very influential essays about the camera obscura, including experiments with light through a small opening in a darkened room. Ibn al-Haytam’s writings on optics became very influential in Europe through Latin translations, inspiring people such as Witelo, John Peckham, Roger Bacon, Leonardo Da Vinci, René Descartes and Johannes Kepler.
The use of a lens in the opening of a wall or closed window shutter of a darkened room to project images used as a drawing aid has been traced back to circa 1550. Since the late 17th century, portable camera obscura devices in tents and boxes were used as a drawing aid.
The only global city in Malaysia, it covers an area of 243 km2 (94 sq mi) and has an estimated population of 1.73 million as...
Kuala Lumpur, officially the Federal Territory of Kuala Lumpur (Malay: Wilayah Persekutuan Kuala Lumpur), or commonly known as KL, is the national capital of Malaysia as well as its largest city in the country.
The only global city in Malaysia, it covers an area of 243 km2 (94 sq mi) and has an estimated population of 1.73 million as of 2016. Greater Kuala Lumpur, also known as the Klang Valley, is an urban agglomeration of 7.25 million people as of 2017. It is among the fastest growing metropolitan regions in South-East Asia, in both population and economic development.
Kuala Lumpur is the cultural, financial and economic centre of Malaysia and home to the Parliament of Malaysia, and the official residence of the Malaysian King (Yang di-Pertuan Agong), the Istana Negara. The city once held the headquarters of the executive and judicial branches of the federal government as well, but they were moved to Putrajaya in early 1999. Some sections of the judiciary still remain in Kuala Lumpur.
The city once held the headquarters of the executive and judicial branches of the federal government as well, but they were moved to Putrajaya in early 1999. Some sections of the judiciary still remain in Kuala Lumpur.
Kuala Lumpur is one of three Federal Territories of Malaysia, enclaved within the state of Selangor, on the central west coast of Peninsular Malaysia. Since the 1990s, the city has played host to many international sporting, political and cultural events including the 1998 Commonwealth Games. Kuala Lumpur has undergone rapid development in recent decades. It is home to the tallest twin buildings in the world, the Petronas Twin Towers, which have become an iconic symbol of Malaysia’s futuristic development.
Kuala Lumpur has a comprehensive road system that is supported by extensive public transport networks such as the Mass Rapid Transit (MRT), Light Metro (LRT), Bus Rapid Transit (BRT), monorail, commuter rail and airport rail link. Kuala Lumpur is one of the leading cities in the world for tourism and shopping. It is the eighth most visited city in the world. The city is also home to three of the world’s 10 largest malls.
Kuala Lumpur has been ranked by the Economist Intelligence Unit Global Liveability Ranking at No. 70 out of 140 global cities, and second in Southeast Asia after Singapore at No. 35. Forbes has also named Kuala Lumpur at No. 6 in its list of 10 best cities to retire abroad, and the best in Asia, with factors including world class healthcare, affordable cost of living and widely spoken English. Kuala Lumpur was named as one of the New7Wonders Cities. Safe Cities Index 2017 has put Kuala Lumpur 31st on its world safest cities list, the highest ranked city for a developing country.
Amsterdam has a population of 851,373 within the city proper, 1,351,587 in the urban area, and 2,410,960 in the Amsterdam metropolitan area. The city is...
Amsterdam is the capital and most populous municipality of the Netherlands. Its status as the capital is mandated by the Constitution of the Netherlands, although it is not the seat of the government, which is The Hague.
Amsterdam has a population of 851,373 within the city proper, 1,351,587 in the urban area, and 2,410,960 in the Amsterdam metropolitan area. The city is located in the province of North Holland in the west of the country but is not its capital, which is Haarlem. The metropolitan area comprises much of the northern part of the Randstad, one of the larger conurbations in Europe, with a population of approximately 8 million.
Amsterdam’s name derives from Amstelredamme, indicative of the city’s origin around a dam in the river Amstel.
Amsterdam’s name derives from Amstelredamme, indicative of the city’s origin around a dam in the river Amstel. Originating as a small fishing village in the late 12th century, Amsterdam became one of the most important ports in the world during the Dutch Golden Age (17th century), a result of its innovative developments in trade. During that time, the city was the leading centre for finance and diamonds. In the 19th and 20th centuries the city expanded, and many new neighbourhoods and suburbs were planned and built. The 17th-century canals of Amsterdam and the 19–20th century Defence Line of Amsterdam are on the UNESCO World Heritage List. Since the annexation of the municipality of Sloten in 1921 by the municipality of Amsterdam, the oldest historic part of the city lies in Sloten (9th century).
As the commercial capital of the Netherlands and one of the top financial centres in Europe, Amsterdam is considered an alpha world city by the Globalization and World Cities (GaWC) study group. The city is also the cultural capital of the Netherlands. Many large Dutch institutions have their headquarters there, and seven of the world’s 500 largest companies, including Philips, AkzoNobel, TomTom and ING, are based in the city. Also, many leading technology companies have their European headquarters in Amsterdam, such as Uber, Netflix and Tesla. In 2012, Amsterdam was ranked the second best city to live in by the Economist Intelligence Unit (EIU) and 12th globally on quality of living for environment and infrastructure by Mercer. The city was ranked 3rd in innovation by Australian innovation agency 2thinknow in their Innovation Cities Index 2009. The Port of Amsterdam to this day remains the second in the country, and the fifth largest seaport in Europe. Famous Amsterdam residents include the diarist Anne Frank, artists Rembrandt van Rijn and Vincent van Gogh, and philosopher Baruch Spinoza.
The Amsterdam Stock Exchange, the oldest stock exchange in the world, is located in the city centre. Amsterdam’s main attractions, including its historic canals, the Rijksmuseum, the Van Gogh Museum, the Stedelijk Museum, Hermitage Amsterdam, the Anne Frank House, the Amsterdam Museum, its red-light district and its many cannabis coffee shops draw more than 5 million international visitors annually. The city is also well known for its nightlife and festival activity; several of its nightclubs (Melkweg, Paradiso) are among the world’s most famous. It is also one of the world’s most multicultural cities, with at least 177 nationalities represented.
After the floods of 1170 and 1173, locals near the river Amstel built a bridge over the river and a dam across it, giving its name to the village: “Aemstelredamme”. The earliest recorded use of that name is in a document dated October 27, 1275, which exempted inhabitants of the village from paying bridge tolls to Count Floris V. This allowed the inhabitants of the village of Aemstelredamme to travel freely through the County of Holland, paying no tolls at bridges, locks and dams. The certificate describes the inhabitants as homines manentes apud Amestelledamme (people residing near Amestelledamme). By 1327, the name had developed into Aemsterdam.
After the floods of 1170 and 1173, locals near the river Amstel built a bridge over the river and a dam across it, giving its name to the village: “Aemstelredamme”
Amsterdam is much younger than Dutch cities such as Nijmegen, Rotterdam, and Utrecht. In October 2008, historical geographer Chris de Bont suggested that the land around Amsterdam was being reclaimed as early as the late 10th century. This does not necessarily mean that there was already a settlement then, since reclamation of land may not have been for farming—it may have been for peat, for use as fuel.
Amsterdam was granted city rights in either 1300 or 1306. From the 14th century on, Amsterdam flourished, largely from trade with the Hanseatic League. In 1345, an alleged Eucharistic miracle in the Kalverstraat rendered the city an important place of pilgrimage until the adoption of the Protestant faith. The Miracle devotion went underground but was kept alive. In the 19th century, especially after the jubilee of 1845, the devotion was revitalized and became an important national point of reference for Dutch Catholics. The Stille Omgang—a silent walk or procession in civil attire—is the expression of the pilgrimage within the Protestant Netherlands since the late 19th century. In the heyday of the Silent Walk, up to 90,000 pilgrims came to Amsterdam. In the 21st century this has reduced to about 5000.