Minggu, 10 Oktober 2010

Surfing

Surfing is a surface water sport. One way to understand the sport - is the definition the sport or pastime of being carried to the shore on the crest of large waves while standing or lying on some sort of board (i.e. longboard, short board, boogie board, wake board, etc.).
Two major subdivisions within stand-up surfing are longboarding and shortboarding, reflecting differences in surfboard design including surfboard length, and riding style.
In tow-in surfing (most often, but not exclusively, associated with big wave surfing), a motorized water vehicle, such as a personal watercraft tows the surfer into the wave front, helping the surfer match a large wave's higher speed, a speed that is generally, but not exclusively a speed that a self-propelled surfer can not match.
Surfing-related sports such as paddleboarding and sea kayaking do not require waves, and other derivative sports such as kitesurfing and windsurfing rely primarily on wind for power, yet all of these platforms may also be used to ride waves.
Recently with the use of V-drive boats, wake surfing, riding the boat wake has emerged.



Surf waves

Photo of surfer catapulted from now-inverted 
board
A surfer wipes out
Photo of wave breaking in turbulent waters
A wave breaking.
Swell is generated when wind blows consistently over a large area of open water, called the wind's fetch. The size of a swell is determined by the strength of the wind and the length of its fetch and duration. Because of this, surf tends to be larger and more prevalent on coastlines exposed to large expanses of ocean traversed by intense low pressure systems.
Local wind conditions affect wave quality, since the surface of a wave can become choppy in blustery conditions. Ideal conditions include a light to moderate "offshore" wind, because it blows into the front of the wave, making it a "barrel" or "tube" wave.
The most important influence on wave shape is the topography of the seabed directly behind and immediately beneath the breaking wave. The contours of the reef or bar front becomes stretched by diffraction. Each break is different, since the underwater topography of one place is unlike any other. At beach breaks, sandbanks change shape from week to week. Surf forecasting is aided by advances in information technology. Mathematical modeling graphically depicts the size and direction of swells around the globe.
Photo of taller-than-human-sized wave breaking 
with several watching surfers in foreground
A large wave breaking
Swell regularity varies across the globe and throughout the year. During winter, heavy swells are generated in the mid-latitudes, when the north and south polar fronts shift toward the Equator. The predominantly westerly winds generate swells that advance eastward, so waves tend to be largest on west coasts during winter months. However, an endless train of mid-latitude cyclones cause the isobars to become undulated, redirecting swells at regular intervals toward the tropics.
East coasts also receive heavy winter swells when low-pressure cells form in the sub-tropics, where slow moving highs inhibits their movement. These lows produce a shorter fetch than polar fronts, however they can still generate heavy swells, since their slower movement increases the duration of a particular wind direction. The variables of fetch and duration both influence how long wind acts over a wave as it travels, since a wave reaching the end of a fetch behaves as if the wind died.
During summer, heavy swells are generated when cyclones form in the tropics. Tropical cyclones form over warm seas, so their occurrence is influenced by El Niño & La Niña cycles. Their movements are unpredictable. They can move westward as in 1979, when Tropical Cyclone Kerry wandered for three weeks across the Coral Sea and into Queensland before dissipating.
Surf travel and some surf camps offer surfers access to remote, tropical locations, where tradewinds ensure offshore conditions. Since winter swells are generated by mid-latitude cyclones, their regularity coincides with the passage of these lows. Swells arrive in pulses, each lasting for a couple of days, with a few days between each swell.

Wave intensity

Drawing showing cross-section of a wave with the top curling from 
left to right over an air-filled region known as its tube. The tube 
contains one double-headed arrow pointing to the lower left and upper 
right labeled width and a second point to upper left and lower right 
labeled length.
The geometry of tube shape can be represented as a ratio between length and width. A perfectly cylindrical vortex has a ratio of 1:1, while the classic almond-shaped tube is nearer 3:1. When width exceeds length, the tube is described as "square".

skateboarding

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Skateboarding is the act of riding and performing tricks using a skateboard. A person who skateboards is most often referred to as a skateboarder, or colloquially within the skateboarding community, a skater.
Skateboarding can be a recreational activity, an artform, a job, or a method of transportation.[1] Skateboarding has been shaped and influenced by many skateboarders throughout the years. A 2002 report by American Sports Data found that there were 18.5 million skateboarders in the world. 85 percent of skateboarders polled who had used a board in the last year were under the age of 18, and 74 percent were male.[2]
Skateboarding is relatively modern. A key skateboarding maneuver, the ollie, was developed in the late 1970s by Alan "Ollie" Gelfand as a half-pipe maneuver. Freestyle skateboarder Rodney Mullen was the first to take it to flat ground and later invented the kickflip and its
 
 

History

The 1940s-1960s

Skateboarding was probably born sometime in the late 1940s or early 1950s when surfers in California wanted something to surf when the waves were flat. No one knows who made the first board, rather, it seems that several people came up with similar ideas at around the same time. These first skateboarders started with wooden boxes or boards with roller skate wheels attached to the bottom. The boxes turned into planks, and eventually companies were producing decks of pressed layers of wood -- similar to the skateboard decks of today. During this time, skateboarding was seen as something to do for fun besides surfing, and was therefore often referred to as "Sidewalk Surfing".
A skateboarder in Tallahassee, Florida.
The first manufactured skateboards were ordered by a Los Angeles, California surf shop, meant to be used by surfers in their downtime. The shop owner, Bill Richard, made a deal with the Chicago Roller Skate Company to produce sets of skate wheels, which they attached to square wooden boards. Accordingly, skateboarding was originally denoted "sidewalk surfing" and early skaters emulated surfing style and maneuvers. Crate scooters preceded skateboards, and were borne of a similar concept, with the exception of having a wooden crate attached to the nose (front of the board), which formed rudimentary handlebars.[4]

A number of surfing manufacturers such as Makaha started building skateboards that resembled small surfboards, and assembling teams to promote their products. The popularity of skateboarding at this time spawned a national magazine, Skateboarder Magazine, and the 1965 international championships were broadcast on national television. The growth of the sport during this period can also be seen in sales figures for Makaha, which quoted $10 million worth of board sales between 1963 and 1965 (Weyland, 2002:28). Yet by 1966 the sales had dropped significantly (ibid) and Skateboarder Magazine had stopped publication. The popularity of skateboarding dropped and remained low until the early 1970s. [4][5]

The 1970s

In the early 1970s, Frank Nasworthy started to develop a skateboard wheel made of polyurethane, calling his company Cadillac Wheels.[4] The improvement in traction and performance was so immense that from the wheel's release in 1972 the popularity of skateboarding started to rise rapidly again, causing companies to invest more in product development. Nasworthy commissioned artist Jim Evans to do a series of paintings promoting Cadillac Wheels, they were featured as ads and posters in the resurrected Skateborder magazine, and proved immensely popular in promoting the new style of skateboarding. Many companies started to manufacture trucks (axles) specially designed for skateboarding, reached in 1976 by Tracker Trucks. As the equipment became more maneuverable, the decks started to get wider, reaching widths of 10 inches (250 mm) and over, thus giving the skateboarder even more control. Banana board is a term used to describe skateboards made of polypropylene that were skinny, flexible, with ribs on the underside for structural support and very popular during the mid-1970s. They were available in myriad colors, bright yellow probably being the most memorable, hence the name.
Manufacturers started to experiment with more exotic composites and metals, like fiberglass and aluminium, but the common skateboards were made of maple plywood. The skateboarders took advantage of the improved handling of their skateboards and started inventing new tricks. Skateboarders, most notably Ty Page, Bruce Logan, Bobby Piercy, Kevin Reed, and the Z-Boys (so-called because of their local Zephyr surf shop) started to skate the vertical walls of swimming pools that were left empty in the 1976 California drought. This started the vert trend in skateboarding. With increased control, vert skaters could skate faster and perform more dangerous tricks, such as slash grinds and frontside/backside airs. This caused liability concerns and increased insurance costs to skatepark owners, and the development (first by Norcon,then more successfully by Rector) of improved knee pads that had a hard sliding cap and strong strapping proved to be too-little-too-late. During this era, the "freestyle" movement in skateboarding began to splinter off and develop into a much more specialized discipline, characterized by the development of a wide assortment of flat-ground tricks.
As a result of the "vert" skating movement, skate parks had to contend with high-liability costs that led to many park closures. In response, vert skaters started making their own ramps, while freestyle skaters continued to evolve their flatland style. Thus by the beginning of the 1980s, skateboarding had once again declined in popularity. [5]

The 1980s

A skateboarder "Ollies" over a garbage bin.
This period was fueled by skateboard companies that were run by skateboarders. The focus was initially on vert ramp skateboarding. The invention of the no-hands aerial (later known as the ollie) by Alan Gelfand in Florida in 1976[6] and the almost parallel development of the grabbed aerial by George Orton and Tony Alva in California made it possible for skaters to perform airs on vertical ramps. While this wave of skateboarding was sparked by commercialized vert ramp skating, a majority of people who skateboarded during this period never rode vert ramps. Because most people could not afford to build vert ramps or did not have access to nearby ramps, street skating gained popularity. Freestyle skating remained healthy throughout this period with pioneers such as Rodney Mullen inventing many of the basic tricks of modern street skating such as the Impossible and the kickflip. The influence freestyle had on street skating became apparent during the mid-eighties, but street skating was still performed on wide vert boards with short noses, slide rails, and large soft wheels. Skateboarding, however, evolved quickly in the late 1980s to accommodate the street skater. Since few skateparks were available to skaters at this time, street skating pushed skaters to seek out shopping centers and public and private property as their "spot" to skate. Public opposition, and the threat of lawsuits, forced businesses and property owners to ban skateboarding on their property.[citation needed] By 1992, only a small fraction of skateboarders remained as a highly technical version of street skating, combined with the decline of vert skating, produced a sport that lacked the mainstream appeal to attract new skaters.

The 1990s to the present

The current generation of skateboards is dominated by street skateboarding. Most boards are about 7¼ to 8 inches wide and 30 to 32 inches long. The wheels are made of an extremely hard polyurethane, with hardness(durometer) approximately 99a. The wheel sizes are relatively small so that the boards are lighter, and the wheel's inertia is overcome quicker, thus making tricks more manageable. Board styles have changed dramatically since the 1970s but have remained mostly alike since the mid 1990s. The contemporary shape of the skateboard is derived from the freestyle boards of the 1980s with a largely symmetrical shape and relatively narrow width. This form had become standard by the mid '90s.
Go Skateboarding Day was created in 2004 by a group of skateboarding companies to promote skateboarding and help make it more noticeable to the world. It is celebrated every year on June 21st.

Trick skating

See Skateboarding trick for detailed descriptions of maneuvers
A skater performs a switch kickflip off a stairset.
With the evolution of skateparks and ramp skating, the skateboard began to change. Early skate tricks had consisted mainly of two-dimensional maneuvers like riding on only two wheels ("wheelie" or "manual"), spinning only on the back wheels (a "pivot"), high jumping over a bar and landing on the board again, also known as a "hippie jump", long jumping from one board to another (often over small barrels or fearless teenagers) or slalom.
In 1976, skateboarding was transformed by the invention of the ollie by Alan "Ollie" Gelfand. It remained largely a unique Florida trick until the summer of 1978, when Gelfand made his first visit to California. Gelfand and his revolutionary maneuvers caught the attention of the West Coast skaters and the media where it began to spread worldwide. The ollie was adapted to flat ground by Rodney Mullen in 1982. Mullen also invented the "Magic Flip", which was later renamed the Kickflip, as well many other tricks including, the 360 Kickflip, which is a 360 pop shove it and a kickflip in the same motion. The flat ground ollie allowed skateboarders to perform tricks in mid-air without any more equipment than the skateboard itself, it has formed the basis of many street skating tricks.
 

National Geographic Adventure

National Geographic Adventure, sebelumnya bernama Adventure One (A1) tapi saat ini dikenal sebagai Nat Geo Adventure, sebuah saluran TV berlangganan bagian dari National Geographic Channels International. Ditujukan pada penonton muda, menyediakan pemrograman yang didasarkan pada petualangan luar, perjalanan dan cerita mengenai orang yang bersenang-senang ketika menjelajahi dunia.
National Geographic Adventure juga merupakan majalah yang berafiliasi dengan National Geographic Society. Majalah ini mencakup perjalanan petualangan, masalah lingkungan, ilmu pengetahuan alam dan topik lain yang berkaitan dengan kegiatan luar.
Australia, Asia Pasifik, Eropa dan Timur Tengah menyiarkan saluran petualangan baru ini, tapi Britania Raya yang sebelumnya menyiarkan A1 memutuskan untuk menggantikannya dengan Nat Geo Wild.[1]
Di awal 2008, National Geographic Adventure Channel Australia dan National Geographic Adventure Channel Italia meluncurkan fitur berbagi video barunya di situs webnya yang bernama Blognotes.


Adventure One (A1)

Logo A1
Saluran ini diberi nama Adventure One (A1) sejak peluncurannya tanggal 1 November 1999 hingga 1 Mei 2007 ketika diluncurkan kembali dengan nama yang baru, memperkuat penampilan Nat Geo secara keseluruhan.[2] Semua negara menerima perubahan ini, kecuali Britania Raya yang mengubah A1 menjadi Nat Geo Wild.

Detasemen Khusus 88

Detasemen Khusus 88 atau Densus 88 adalah satuan khusus Kepolisian Negara Republik Indonesia untuk penanggulangan teroris di Indonesia. Pasukan khusus berompi merah ini dilatih khusus untuk menangani segala ancaman teror, termasuk teror bom. Beberapa anggota juga merupakan anggota tim Gegana.
Detasemen 88 dirancang sebagai unit antiteroris yang memiliki kemampuan mengatasi gangguan teroris mulai dari ancaman bom hingga penyanderaan. Densus 88 di pusat (Mabes Polri) berkekuatan diperkirakan 400 personel ini terdiri dari ahli investigasi, ahli bahan peledak (penjinak bom), dan unit pemukul yang di dalamnya terdapat ahli penembak jitu. Selain itu masing-masing kepolisian daerah juga memiliki unit anti teror yang disebut Densus 88, beranggotakan 45 - 75 orang, namun dengan fasilitas dan kemampuan yang lebih terbatas. Fungsi Densus 88 Polda adalah memeriksa laporan aktifitas teror di daerah.Melakukan penangkapan kepada personil atau seseorang atau sekelompok orang yang dipastikan merupakan anggota jaringan teroris yang dapat membahayakan keutuhan dan keamanan negara R.I.
Densus 88 adalah salah satu dari unit anti teror di Indonesia, disamping Detasemen C Gegana Brimob, Detasemen Penanggulangan Teror (Dengultor) TNI AD alias Grup 5 Anti Teror, Detasemen 81 Kopasus TNI AD (Kopasus sendiri sebagai pasukan khusus juga memiliki kemampuan anti teror), Detasemen Jalamangkara (Denjaka) Korps Marinir TNI AL, Detasemen Bravo (Denbravo) TNI AU, dan satuan anti-teror BIN.



Pembentukan

 
Detasemen 88 - Latihan Penyergapan
Satuan ini diresmikan oleh Kepala Kepolisian Daerah Metro Jaya Inspektur Jenderal Firman Gani pada tanggal 26 Agustus 2004. Detasemen 88 yang awalnya beranggotakan 75 orang ini dipimpin oleh Ajun Komisaris Besar Polisi Tito Karnavian yang pernah mendapat pelatihan di beberapa negara.[rujukan?]
Densus 88 dibentuk dengan Skep Kapolri No. 30/VI/2003 tertanggal 20 Juni 2003, untuk melaksanakan Undang-undang No. 15 Tahun 2003 tentang penetapan Perpu No. 1 Tahun 2002 tentang Pemberantasan Tindak Pidana Terorisme, yaitu dengan kewenangan melakukan penangkapan dengan bukti awal yang dapat berasal dari laporan intelijen manapun, selama 7 x 24 jam (sesuai pasal 26 & 28). Undang-undang tersebut populer di dunia sebagai "Anti Teror Act".
Angka 88 berasal dari kata ATA (Anti Terror Act), yang jika dilafalkan dalam bahasa Inggris berbunyi Ei Ti Ekt. Pelafalan ini kedengaran seperti Eighty Eight (88). Jadi arti angka 88 bukan seperti yang selama ini beredar bahwa 88 adalah representasi dari jumlah korban bom bali terbanyak (88 orang dari Australia), juga bukan pula representasi dari borgol.[rujukan?]
Pasukan khusus ini dibiayai oleh pemerintah Amerika Serikat melalui bagian Jasa Keamanan Diplomatik (Diplomatic Security Service) Departemen Luar Negeri AS dan dilatih langsung oleh instruktur dari CIA, FBI, dan U.S. Secret Service.[rujukan?] Kebanyakan staf pengajarnya adalah bekas anggota pasukan khusus AS. Informasi yang bersumber dari FEER pada tahun 2003 ini dibantah oleh Kepala Bidang Penerangan Umum (Kabidpenum) Divisi Humas Polri, Kombes Zainuri Lubis, dan Kapolri Jenderal Pol Da’i Bachtiar. [1] Sekalipun demikian, terdapat bantuan signifikan dari pemerintah Amerika Serikat dan Australia dalam pembentukan dan operasional Detasemen Khusus 88. Pasca pembentukan, Densus 88 dilakukan pula kerjasama dengan beberapa negara lain seperti Inggris dan Jerman. Hal ini dilakukan sejalan dengan UU Pemberantasan Tindak Pidana Terorisme pasal 43.




Persenjataan

Satuan pasukan khusus baru Polri ini dilengkapi dengan persenjataan dan kendaraan tempur buatan berbagai negara, seperti senapan serbu Colt M4, senapan serbu Steyr AUG (seperti gambar diatas), HK MP5, senapan penembak jitu Armalite AR-10, dan shotgun Remington 870. Bahkan dikabarkan satuan ini akan memiliki pesawat C-130 Hercules sendiri untuk meningkatkan mobilitasnya. Sekalipun demikian kelengkapan persenjataan dan peralatan Densus 88 masih jauh dibawah pasukan anti teror negara maju seperti SWAT Team di Kepolisian Amerika.[2]

Operasi yang diketahui

Detasemen 88 - Konvoi Tempur