Triangulation sensor

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Optical Triangulation Sensors are commonly used to provide door mounted safety detection on swinging automatic doors.
In North America, these types of sensors are very common and manufactured in very high volumes. When automatic swinging doors open and close, it is important that they do not come into contact with pedestrians passing through the door.
Sensors used in the automatic door industry typically fall into four categories:
Microwave Sensors used to detect motion of a person as they approach an automatic door,
Reflective Optical Sensors that are mounted on the door header and detect the presence of a person in the door path
camera based sensors that are also mounted on the door header and detect presence (a competing technology to Reflective Optical Sensors); and
Triangulation sensors which are mounted on the door and move with the door to provide safety.
Reflective and Camera technologies do not perform well on moving swing doors, because they typically depend upon detection of changes in the background. A sensor mounted on a swing door system is constantly in motion, so the background (i.e. floor beneath the door) changes continuously. To overcome this problem, a triangulation sensor provides an innovative solution.
Triangulation Sensor Functionality
In most cases an optical triangulation sensor is mounted near the top of the swinging door frame, inside a long extruded aluminum tube with an optical window facing the floor. An 880nm LED light source emits a collimated light beam that is emitted from the sensor, bounces off the floor and is received by a photodiode positioned adjacent to the LED source. A second photodiode (or a linear array of photodiodes) are positioned farther along the length of the sensor. When the emitted beam bounces off the floor, the reflected energy is almost exclusively concentrated on the first adjacent photodiode. When a human or object moves into the optical path, the reflected beam bounces back from the object. Since the beam is no longer traveling the full optical path length to the floor, its reflected angle changes. One of the adjacent photodiodes then receives the optical energy and the sensor responds by sending a signal to the automatic door controller. At that point the door stops, slows or reverses, hence averting a collision and providing safety.
Triangulation sensors are found on a number of door brands and manufactured by several sensor manufacturers. One example is the SuperScan-II from BEA. Other products from other manufacturers are also available.
Safety standards
ANSI A156.10-2005 standard for U.S. Automatic Pedestrian Doors
American Association of Automatic Door Manufacturers (AAADM)
DIN 18650 Automatic Door Standard (Germany)
External links
SuperScan-II
Categories: Electro mechanical engineering | Automation | Doors(and so on)

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Annulus (firestop)

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Sprinkler branch pipe through-penetration with plastic sleeve - missing firestop in concrete fire separation. The branch pipe is a penetrant, as is the plastic sleeve, which is a code violation if left in place, unless allowed by the certification listing with a firestop that permits such sleeving to be left in place. The space between the sleeve and the pipe is the annulus or annular space
The Annulus, or annular space, is the space between a penetrant and whatever surrounds it, such as the sides of an opening or a sleeve, as the case may be.
Sometimes an annulus can be "offset", meaning that the penetrant is not centred.If the firestop was tested only to a perfectly centred opening, an offset may disqualify it for use in the field.
In practical terms, an offset penetrant or annulus may very well present an added degree of difficulty for passing the fire test. A metallic sleeve as well as a metallic penetrant will conduct heat through the firestop. Insulation on the bottom of floor systems or in the middle of wall systems, as is the case with caulking or paint based (soft) systems, will encourage more heat to travel through the sleeve and the penetrant, which can put more stress on the seal on the unexposed side. In the case of a thin (below 4") firestop mortar, there is also more potential hazard from tight annular spacing because metal expands during the fire, thus squeezing the firestop - only to rapidly shrink when hit with the hose-stream test, which can let water through, thus failing the H rating in Canada or the entire rating in the US, where hose-stream testing is mandatory. Such a failure may no longer be visible once the test assembly has reached ambient temperatures again.
For all these considerations, the annular space is a critical aspect field approvals.
External links
External examples of the use of the term.
Annulus, a term used within a firestop patent
Annulus, as used in UL System C-AJ-1557 Firestop System, Configuration A
Categories: Passive fire protection(and so on)

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Cue sports techniques

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Illustration from Michael Phelan's 1859 book, The Game of Billiards
Cue sports techniques (usually more specific, e.g., billiards techniques, snooker techniques) are an immensely important aspect of game play in the various cue sports such as carom billiards, pool, snooker and other games. Such techniques are used on each shot in an attempt to achieve an immediate aim such as scoring or playing a safety, while at the same time exercising control over the positioning of the cue ball and often the object balls for the next shot or inning.
In carom games, an advanced player's aim on most shots is to leave the cue ball and the object balls in position such that the next shot is of a less difficult variety to make the requisite carom, and so that the next shot is in position to be manipulated in turn for yet another shot; ad infinitum.
Similarly, in many pocket billiards games, an advanced player's aim is to manipulate the cue ball so that it is in position to pocket (pot) a chosen next object ball and so that that next shot can also be manipulated for the next shot, and so on. Whereas in the carom games, manipulation of the object ball's position is crucial as well on every shot, in some pool games this is not as large a factor because on a successful shot the object ball is pocketed. However, many shots in one-pocket, for example, have this same added object ball control factor for most shots.
If a player is not attempting to score or pocket, depending on the game, then the goal is usually to exercise control over the cue ball to leave some type of safety to make it more difficult for the opponent to score or pocket.
In order to control the cue ball on a shot, a player must master a wide variety of techniques, and have a well-founded conceptual grasp of the mechanics involved. As stated by George Fels, "pool's poet laureate":[1]
The mere pocketing of a ball isn't that hard; in fact, it's relatively simple. What drives many, many players to distraction is the unpredictability of the cueball's path of travel...the game of billiards requires you to drive a ball someplace; pool, in any form, mostly asks you to stop a ball someplace. In either case, you'll fare much better when you understand the how and why of a ball's getting from one place to another.[1]
Contents
1 Sidespin (english)
2 Follow
2.1 Force-follow
3 Draw
4 Slide
4.1 The stop and stun shots
4.2 The tangent line
5 Throw
6 The semi-mass ("curve" or "swerve") shot
7 The mass shot
8 Swerve effect
9 Deflection (squirt)
10 The jump shot
11 References
//
Sidespin (english)

The Night Cafe (1888), by Vincent van Gogh, showing a pocketless carom table
The term english (called "side" in the UK, and sometimes simply called "left" or "right", and sometimes "check side" for left-hand side, and "running side" for right-hand side) normally refers to sidespin put on a cue ball by hitting it to the left or right of center. Generally, English is used to change the angle of reflection of the cue ball after it contacts a rail. English also affects the direction an object ball takes on impact (the "throw" effect), as well as the path of travel of the cue ball after impact with a cue ("deflection" or "squirt").
Sometimes English is conflated to refer as well to spin imparted on the vertical axis of the cue ball. However, an above center hit is more precisely referred to as 'follow,' ('top' in the UK) and a below center hit, as 'draw' ('screw' or 'back spin' in the UK). Any time the cue ball is not struck directly in the center, some spin will be imparted, whether left or right English, follow or draw. Unintentional sidespin is a common source of missed shots. Spin is not always placed on the cue ball by the shooter; spin is naturally imparted to the cue ball from contact with pool cloth on the bed of the table and on the table's cushions.
Follow
Follow, sometimes called top spin or simply "top," is spin in the direction of travel of the cue ball, such that it is spinning faster than it would from its natural roll. If the cue ball has top spin on it, it will resume rolling forward after making contact dead-on with the object ball and "follow" the object ball rather than stopping abruptly.
Top spin is imparted to a ball by hitting it above the midpoint of its vertical plane as it faces the shooter. Top spin is spin in the direction a ball naturally "wants" to take in reaction to friction from contact with the pool cloth. Because of this, a ball sliding on the cloth will rapidly pick up follow. Likewise, a ball struck so that it is spinning backwards (with draw see below) immediately starts losing that spin, and if it travels far enough, will reach a sliding point (no spin), soon graduating to natural follow.
Follow applied to a non-dead-on shot will cause...(and so on)

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Mitsubishi 380

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Mitsubishi 380
Manufacturer
Mitsubishi Motors Australia
Parent company
Mitsubishi Motors
Production
20052008
Assembly
Clovelly Park, South Australia, Australia
Predecessor
Mitsubishi Magna/Verada
Class
Mid-size car
Body style(s)
4-door sedan
Layout
FF layout
Platform
Mitsubishi PS platform
Engine(s)
3.8L 6G75 V6
Transmission(s)
5-speed manual5-speed automatic
Wheelbase
2750mm (108.3in)
Length
4837mm (190.4in)4855mm (191.1in)
Width
1840mm (72.4in)
Height
1480mm (58.3in)
Curb weight
1625kg (3583lb)1670kg (3682lb)
Related
Mitsubishi Galant
The Mitsubishi 380 is a mid-size car that was produced by Mitsubishi Motors Australia (MMAL) between 2005 and 2008. It was the successor to the Mitsubishi Magna/Verada line of vehicles first introduced in 1985. The company spent over AU$600 million developing and producing the car, which is heavily based on the ninth generation Mitsubishi Galant designed in the United States.[1] The 380 continued the MMAL tradition of producing front-wheel drive sedans for the Australian market, and along with the Toyota Aurion, competed against the rear-wheel drive Ford Falcon and Holden Commodore vehicles.
Even before the car's launch, the 380 was stigmatised as the "make or break" model for MMAL.[2] After a slow sales start, the line-up was updated with the Series II on April 28, 2006, with the entry level model receiving price discount of nearly 20%.[3] To generate further interest in the car, a Series III revision came on July 29, 2007 with mainly cosmetic changes.[4] These updates failed to lift sales, and with production still unprofitable MMAL ceased manufacture of the 380 in March 2008.
Contents
1 History of development
1.1 Design
1.2 Engineering
2 Specification levels
3 Sales, reception and the final curtain on Australian production
3.1 Annual production and sales
4 Notes
5 References
//
History of development
The development of the DB series Mitsubishi 380 began in 2002, when company executives in Japan gave approval to MMAL to commence work on two closely related vehicles. The first of which was a right-hand drive variant of the ninth generation Mitsubishi Galant, designated the codename PS41. This was to be the replacement for the Magna and Verada. The second, which was planned to be launched in 2007 was a long-wheelbase version known internally as PS41L to be produced in both left- and right-hand drive configurations.[5] However, as Mitsubishi's financial woes worsened, and DaimlerChrysler pulled-out of the DaimlerChrysler-Mitsubishi alliance, PS41L was abandoned in 2004 and the likelihood of PS41 making it into production looked doubtful. Company research conducted in mid-2004 revealed that 84percent of Australians (roughly four out of every five) believed that Mitsubishi would cease production in Australia. To reinstate consumer confidence in the brand, before the launch of the 380, a series of television commercials began airing in December 2004.[6] Centralised around Mitsubishi Australia鎶� then CEO Tom Phillips, the advertisements promoted the introduction of an industry-first five-year/130,000kilometre warranty. Mitsubishi reworked a slogan from former Chrysler chairman Lee Iacocca, concluding their commercials with the tagline, "if you can find a better-built, better-backed car anywhere, then buy it".[7]

Original front-end styling of the base 380 also shared by the LS and LX models.
In total, AU$600million was spent on developing the 380, including $250million on upgrading the Adelaide production facility to manufacture the vehicle.[8] This included the installation of a new body press, casting the body sides from an individual piece of steel. This has the effect of producing a 0.7millimetre (0.03in) size differentiation from body-to-body, compared to the industry standard of 1.0 to 1.5millimetres (0.040.06in) in 2005.[9]
Design
From the very beginning of the project, Mitsubishi had always intended that the PS41 would be set apart from the North American Galant in terms of exterior styling. The problem was that PS41 had to share the same basic foundation and the side profile was to remain for the most part unchanged. A revamp of the Clovelly Park facility allowed for the use of more robust bodies. The consequence of this is the tooling required to produce the panels. This gave MMAL the opportunity to make several low key variances to the design. These came in the from of larger front guards, a revised bonnet, new headlamps as well as grilles and bumpers.[10]
The front-end of the PS41 was originally penned by Mitsubishi's design chief, Olivier Boulay. Boulay was also responsible for the 2003 Magna/Verada facelift, but this update...(and so on)

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Fiber media converter

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Fiber media converters are simple networking devices that make it possible to connect two dissimilar media types such as twisted pair with fiber optic cabling. They were introduced to the industry nearly two decades ago, and are important in interconnecting fiber optic cabling-based systems with existing copper-based, structured cabling systems. They are also used in MAN access and data transport services to enterprise customers.
Contents
1 Media conversion types
2 See also
3 References
4 External links
//
Media conversion types
Fiber media converters support many different data communication protocols including Ethernet, Fast Ethernet, Gigabit Ethernet, T1/E1/J1, DS3/E3, as well as multiple cabling types such as coax, twisted pair, multi-mode and single-mode fiber optics. Media converter types range from small standalone devices and PC card converters to high port-density chassis systems that offer many advanced features for network management. Simple Network Management Protocol (SNMP) enables proactive management of link status, monitoring chassis environmental statistics and sending traps to network managers in the event of a fiber break or even link loss on the copper port.
Fiber media converters can connect different LAN media, modifying duplex and speed settings. Switching media converters can connect legacy 10Base-T network segments to more recent 100Base-TX or 100Base-FX Fast Ethernet infrastructure. For example, existing Half-Duplex hubs can be connected to 100Base-TX Fast Ethernet network segments over 100Base-FX fiber.
When expanding the reach of the LAN to span multiple locations, media converters are useful in connecting multiple LANs to form one large "campus area network" that spans over a limited geographic area. As premises networks are primarily copper-based, media converters can extend the reach of the LAN over single-mode fiber up to 130 kilometers with 1550nm optics.
Wavelength Division Multiplexing (WDM) technology in the LAN is especially beneficial in situations where fiber is in limited supply or expensive to provision. As well as conventional dual strand fiber converters, with separate receive and transmit ports, there are also single strand fiber converters, which can extend full-duplex data transmission up to 70 kilometers over one optical fiber.
Other benefits of media conversion include providing a gradual migration path from copper to fiber. Fiber connections can reduce electromagnetic interference.
See also
Computer Networking portal
Ethernet
Fast Ethernet
Gigabit Ethernet
Local Area Network
Metropolitan Area Network
Wide Area Network
Computer Network
Optical communication
Optical fiber connector: ST, SC and MTRJ
SFP transceiver
Network Management
Simple Network Management Protocol
References
Spurgeon, Charles E., Ethernet: The Definitive Guide, Sebastopol, CA: O'Reilly & Associates, 2000
Residential Network Cabling, New York, NY: R.R. Donnelley & Sons Company, 2002
The Switching Book, Xylan: An Alcatel Company, 1999
External links
The Metro Ethernet Forum
The Fiber Optic Association
FOA color code for connectors
"Fibers", article in RP Photonics' Encyclopedia of Laser Physics and Technology
How Fiber Optics are made In video
"Fiber Optic Tutorial" Educational site from Arc Electronics
Categories: Fiber optics | Telecommunications equipment(and so on)

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Mixer (cooking)

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Handheld electric mixer

Whisking egg whites

KitchenAid Stand Mixer in action
A mixer is a kitchen appliance intended for mixing, folding, beating, and whipping food ingredients. Mixers come in two major variations, hand mixers and stand mixers.
A hand mixer, as the name implies, is a hand-held mixing device. It typically consists of a handle mounted over a large enclosure containing the motor, which drives one or two beaters. The beaters are immersed in the food to be.
In 1870, Sir Walter Scott of Providence, R.I., invented the first hand egg beater. U.S. Patent 103,811
A stand mixer is essentially the same as a hand mixer, but is mounted on a stand which bears the weight of the device. Stand mixers are larger and have more powerful motors than their hand-held counterparts. They generally have a special bowl that is locked in place while the mixer is operating. Heavy duty commercial models can have bowl capacities in excess of 100 quarts (95 L), but more typical home and commercial models are equipped with bowls of around 4 quarts (4 L). A typical home stand mixer will include a wire whip for whipping creams and egg whites; a flat beater for mixing batters; and a dough hook for kneading.
The first electric mixer was invented by Herbert Johnston in 1908 and sold by the KitchenAid division of the Hobart Manufacturing Company.[1] [2]
Older models of mixers originally listed each speed by name of operation (ex: Beat-Whip would be high speed if it is a 3-speed mixer); they are now listed by number.
The current KitchenAid domestic food mixer[3] is an American classic, little changed from the original design patent application of 1937.[4]
Another classic American design is the Sunbeam MixMaster domestic food mixer,[5] which first went on sale in May, 1930.[6]
Mixers should not be confused with blenders. Blenders contain sharp blades and typically operate at higher speeds that chop, liquefy, or otherwise break down larger food items. A mixer is a much slower device without blades.
References
^ "Did you know?". http://www.bestbetblenders.com/page/page/5333438.htm.
^ "Fascinating facts about the invention of the Standing Mixer by Herbert Johnson in 1908". http://www.ideafinder.com/history/inventions/mixers.htm.
^ "Tilt-Head Stand Mixer". http://kitchenaid.com/catalog/product.jsp?src=Stand+Mixers&cat=310&prod=349.
^ "Design for a food mixing apparatus". 1939. http://www.google.com/patents?vid=USPATD116747&id=_JVzAAAAEBAJ&pg=PP1&dq=food+mixing&as_drrb_ap=b&as_minm_ap=1&as_miny_ap=1935&as_maxm_ap=1&as_maxy_ap=1940#PPP1,M1.
^ "Heritage Stand Mixer - Model: 2349". http://www.sunbeam.com/productdetail.aspx?PId=58.
^ Sunbeam Mixmaster - The Mixer America Grew Up With
External links
How to Choose a Mixer
Factory Authorized Sunbeam Mixmaster parts
Hand Mixers Review
Stand Mixers Review
Categories: Food preparation appliances(and so on)

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Phase Change Material

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(Redirected from Phase change material)

A PCM
A phase change material (PCM) is a substance with a high heat of fusion which, melting and solidifying at a certain temperature, is capable of storing and releasing large amounts of energy. Heat is absorbed or released when the material changes from solid to liquid and vice versa; thus, PCMs are classified as latent heat storage (LHS) units.
Contents
1 Characteristics and classification
1.1 Organic PCMs
1.2 Inorganic
1.3 Eutectics
2 Selection Criteria
3 Thermo-physical properties of selected PCMs
4 Technology, Development and Encapsulation
5 Thermal composites
6 Applications
7 Fire and safety issues
8 Links
9 References
//
Characteristics and classification
PCMs latent heat storage can be achieved through solid-solid, solid-liquid, solid-gas and liquid-gas phase change. However, the only phase change used for PCMs is the solid-liquid change. Liquid-gas phase changes are not practical for use as thermal storage due to the large volumes or high pressures required to store the materials when in their gas phase. Liquid-gas transitions do have a higher heat of transformation than solid-liquid transitions. Solid-solid phase changes are typically very slow and have a rather low heat of transformation.
Initially, the solid-liquid PCMs behave like sensible heat storage (SHS) materials; their temperature rises as they absorb heat. Unlike conventional SHS, however, when PCMs reach the temperature at which they change phase (their melting temperature) they absorb large amounts of heat at an almost constant temperature. The PCM continues to absorb heat without a significant raise in temperature until all the material is transformed to the liquid phase. When the ambient temperature around a liquid material falls, the PCM solidifies, releasing its stored latent heat. A large number of PCMs are available in any required temperature range from -5 up to 190 oC [1]. Within the human comfort range of 20 to 30鐧�, some PCMs are very effective. They store 5 to 14 times more heat per unit volume than conventional storage materials such as water, masonry, or rock.[citation needed]
Organic PCMs
Paraffin (CnH2n+2) and Fatty acids (CH3(CH2)2nCOOH)
Advantages
Availability in a large temperature range
Freeze without much super cooling
Ability to melt congruently
Self nucleating properties
Compatibility with conventional material of construction
No segregation
Chemically stable
High heat of fusion
Safe and non-reactive
Recyclable
Disadvantages
Low thermal conductivity in their solid state. High heat transfer rates are required during the freezing cycle
Volumetric latent heat storage capacity is low
Flammable. This can be easily alleviated by a proper container
Due to cost consideration only technical grade paraffins may be used which are essentially paraffin mixture and are completely refined of oil
Inorganic
Salt hydrates (MnH2O)
Advantages
High volumetric latent heat storage capacity
Low cost and easy availability
Sharp melting point
High thermal conductivity
High heat of fusion
Low volume change
Non-flammable
Disadvantages
Change of volume is very high
Super cooling is major problem in solid-liquid transition
Nucleating agents are needed and they often become inoperative after repeated cycling
Eutectics
Organic-organic, organic-inorganic, inorganic-inorganic compounds
Advantages
Eutectics have sharp melting point similar to pure substance
Volumetric storage density is slightly above organic compounds
Disadvantages
Only limited data is available on thermo-physical properties as the use of these materials are very new to thermal storage application
Selection Criteria
Thermodynamic properties, The phase change material should possess [2]
Melting temperature in the desired operating temperature range
High latent heat of fusion per unit volume
High specific heat, high density and high thermal conductivity
Small Volume changes on phase transformation and small vapor pressure at operating temperatures to reduce the containment problem
Congruent melting
Kinetic properties
High nucleation rate to avoid super cooling of the liquid phase
High rate of crystal growth, so that the system can meet demands of heat recovery from the storage system
Chemical properties
Chemical stability
Complete reversible freeze/melt cycle
No degradation after a large number of freeze/melt cycle
Non-corrosiveness, non-toxic, non-flammable and non-explosive materials
Economic properties
Low cost...(and so on)

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Luis Marden

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Luis Marden (born Annibale Luigi Paragallo) (January 25, 1913 March 3, 2003) was an American photographer, explorer, writer, filmmaker, diver, navigator, and linguist who worked for National Geographic Magazine. He worked as a photographer and reporter before serving as chief of the National Geographic foreign editorial staff. He was a pioneer in the use of color photography, both on land and underwater, and also made many discoveries in the world of science. His polymathic nature have led many to consider him the epitome of the "National Geographic man," the old-time adventurer who trekked to the edges of the globe in search of material for the magazine's longer articles. Though he had officially retired in 1976, Marden continued to write occasional stories long after. He wrote more than 60 articles for the magazine.
Contents
1 Youth and Early Adventures
2 Underwater Photography and Diving
3 Marden and the Guanahani Debate
4 Activities as a Linguist
5 Fly-rods and bamboo
6 Other activities
7 Friendships and Honors
8 The Marden House
9 Death
10 Discoveries
11 Named after Marden
12 Sources
//
Youth and Early Adventures
Born in Chelsea, Massachusetts of Italian heritage, Marden went by the name Louis Paragallo while growing up in nearby Quincy. Marden was introduced to photography at a chemistry class while attending Quincy Senior High School. Marden's interest was intense and lasting. In 1932, at the age of 19, he wrote a book called Color Photography with the Miniature Camera, which may be the first book ever published on 35mm color photography.
Marden began his career at a radio station in Boston, where he had a photography program called "Camera Club of the Air." On his station manager's recommendation, he changed his name to Luis Marden, his new surname a random selection from a phone book. He then worked as a freelance photographer for The Boston Herald.
His expertise in color photography subsequently brought him to National Geographic magazine, where he was officially hired on July 23, 1934. The magazine prided itself on publishing quality color photography, and Marden was making good use of a lightweight Leica, which could hang from a single neck strap. Marden successfully convinced the magazine to see the benefits of using the small 35mm cameras loaded with the new Kodachrome film over the bulky cameras with tripods and glass plates that were being used by the magazine's photographers at the time.
Marden's first assignment as a reporter was in the Yucat閱� Peninsula. After sailing on a tramp steamer, Marden explored the peninsula with a Model T Ford. He then acquired a mule. He got decompression sickness after diving in a holy Mayan well.
Underwater Photography and Diving
Marden's knowledge of Spanish led to his appointment during World War II as National Geographic's "Latin America man," and Marden was sent on assignments throughout Central America, South America, and the Caribbean. In 1941, he dove off Antigua, where he saw his first coral reef.
Deciding he wanted to photograph the riches of the deep, Marden worked with Jacques Cousteau aboard the Calypso in the mid-1950s. A pioneer of underwater color photography, Marden developed many techniques in this field that are still used today, such as the use of filters and auxiliary lighting in order to enhance color.
Marden discovered the remains of Captain Bligh's HMS Bounty in January 1957. After spotting a rudder from this ship in a museum on Fiji, he persuaded his editors to let him dive off Pitcairn Island, where the rudder had been recovered. Despite the warnings of one islander -"Man, you gwen be dead as a hatchet!"[1] Marden dove for several days in the dangerous swells near the island, and found the remains of the fabled ship. He subsequently met with Marlon Brando to counsel him on his role as Fletcher Christian in the 1962 film Mutiny on the Bounty. Later in life, when he stuck with his tailored English suits while his colleagues wore more casual attire, Marden wore also cuff links made of nails from the Bounty. MGM had a reconstruction of the Bounty built for their 1962 film, named the Bounty II. This vessel was built, of wood, to the original plans, in a traditional manner in a shipyard in Lunenberg, Nova Scotia. However, all the dimensions were increased by approximately one third to accommodate the large cameras in use at that time.
At the island of Tofua (Bligh spelled it Tofoa), Bligh and eighteen loyalists had sought refuge in a cave in order to augment their meager provisions. In the March 1968 issue of the National Geographic Magazine, Marden claimed to have found this cave as well as the grave of John Norton, a crewman stoned to the death by the Tofuans. Both findings were later disproved by Bengt Danielsson (who had been a member of the 1947 Kon-Tiki...(and so on)

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Athletic shoe

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It has been suggested that Sneaker collecting#History be merged into this article or section. (Discuss)

A pair of Nike athletic shoes.
An athletic shoe is a generic name for footwear designed for sporting and physical activities, and is different in style and build than a dress shoe.
Athletic shoes, depending on the location and the actual type of footwear, can also go by the name trainers (British English), sandshoes, gym boots or joggers (Australian English) running shoes, runners or gutties (Canadian English, Australian English, Hiberno-English), sneakers, tennis shoes (North American English, Australian English), gym shoes, tennies, sport shoes, sneaks, or takkies (South African English) and rubber shoes (Philippine English).
Contents
1 Use of athletic shoes
1.1 Use in sports
2 Etymology
3 Sneaker Culture
4 The New Generation of Sneaker Care
5 Popular brands
6 Types of athletic shoes
7 References
8 External links
//
Use of athletic shoes
Use in sports
The term athletic shoes is used for running in a marathon or half marathon, basketball, and tennis (amongst others) but tends to exclude shoes for sports played on grass such as football (futbol) and rugby, which are generally known as "boots", or in North America as cleats.
The shoes themselves are made of flexible material, typically featuring a sole made of dense rubber. While the original design was basic, manufacturers have since tailored athletic shoes for the different purposes that they can be used for, many of these shoes are made up to a very large size because of the athletes large feet (Delin Harick). A specific example of this is the spiked shoe developed for track running.
High-end marathon running shoes will often come in different shapes suited to different foot types, gait etc.
There are a variety of specialized shoes designed for specific uses:
Racing flats
Track shoe
Skate shoes
Climbing shoe
Approach shoe
Wrestling shoes
Cleats
Football boot
Etymology
The British English term "trainer" derives from "training shoe". There is evidence [1] that this usage of "trainer" originated as a genericised tradename for a make of training shoe made in 1968 by Gola.
Plimsolls (English English) are indoor athletic shoes, and are also called sneakers in northeastern American English and daps in Welsh English. The word "sneaker" is often attributed to Henry Nelson McKinney, an advertising agent for N. W. Ayer & Son, who, in 1917, coined the term because the rubber sole made the shoe stealthy. All other shoes, with the exception of moccasins, were unsuitable for sneaking due to the noise they inevitably produced. However, the word was in use at least as early as 1887, as the Boston Journal of Education made reference to "sneakers" as "the name boys give to tennis shoes".
Sneaker Culture
Globally, an underground subculture known as "sneakerheads" is moving towards the forefront of fashion. Likened to the focus on women's shoe culture, casual sneakers like the Air Force One (Nike) or Superstar (Adidas) have become icons in today's pop culture. Artists/Customizers are now creating works of art that increase the value of casual sneakers to upwards of $500 from the original $70-$90 retail. Music Star fashion lines are now producing footwear that is similar in build to the Nike and Adidas counterparts and footwear sales continue to climb. Recently, Vanessa and Angela Simmons (daughters of Joseph Simmons aka Rev Run of Run DMC) have launched their own Air Force One like line called Pastry.
The New Generation of Sneaker Care
From the onset of the new Sneakerhead culture and the new markets for aftermarket, rare, and customized sneakers; a new shoe care accessory has hit the shelf at local stores and online ecommerce sites. The decreaser or crease preventing insert is now a must have for sneaker enthusiasts and collectors. The Force Field is now sold in most sneaker chain stores and boasts the ability to prevent creases in the toe box comfortably. However, according to online forums (sneakerfreaker.com, solecollector.com, hypebeast.com) the Force Field is now being eclipsed by the "wearable shoe tree". The new shoe tree is made from a plastic that comes in a rigid and soft version to be worn with sneakers like the force field, but is reported to have better protection.
The sales for these accessories is growing to match the sneaker cleaning sprays and brushes that are also sold on the shoe care shelves next to the registers.
Popular brands
Main article: List of athletic shoe brands
Popular brands include ASICS, Adidas, Heelys, FILA, Converse, Reebok, New Balance, Nike, Puma, Lacoste, K-Swiss, Gola, DC Shoes, Vans, Pony and Mizuno.
Types of athletic shoes
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Miracle Method

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Contents
1 Miracle Method
1.1 History
1.2 The Miracle Method Name
1.3 Refinishing, A Green Alternative[1]
1.4 Services
2 References
3 External Links
//
Miracle Method
Miracle Method US Corp.
Type
Corporation
Founded
1979 in San Francisco
Headquarters
Colorado Springs, CO
Number of locations
120 franchise locations across the United States and Europe
Key people
Charles Pistor, CEO & Chairman
Industry
Home Improvement Services
Products
Bath and Kitchen surface repair and renovation of tubs, tile, countertops, sinks, and vanities
Website
www.miraclemethod.com
Miracle Method is a surface restoration company specializing in the repair and refinishing of all types of bathtubs, showers, sinks, kitchen countertops, ceramic tile, and bathroom vanities. This is an on-site service so the fixture does not have to be removed. Refinishing is regularly performed in homes, hotels, apartments, college residence halls, nursing homes, and even cruise ships...any property with a kitchen or bath.
History
Miracle Method started in the San Francisco Bay area and began franchising in 1979. It has grown to over 120 locations throughout the United States and Europe. Miracle Method is the largest bath and kitchen refinishing company in the United States.
The current management team, led by Charles Pistor, has operated Miracle Method U.S. Corp since 1996. The company is headquartered in Colorado Springs, CO and has no other business interests other than surface restoration. The company has expanded through franchise sales and purchasing other refinishing companies. In 1999, the company purchased the Surface Doctor franchise which had over 45 locations primarily in the southeast part of the US.
The Miracle Method Name
The Miracle Method name came from the development of a unique, proprietary bonding agent that eliminated the use of hydrofluoric acid. In the 1970's, using caustic acids was the traditional way to try to get a new finish to stick in the refinishing process. These acids were so strong they would etch or break down the glass finishes on ceramic tile and porcelain tubs. Unfortunately, these acids were dangerous to use and the resulting mechanical bond of the new finish to the old surface had some shortcomings which led to failures of adhesion and peeling.
Seeking a better technology, Miracle Method developed a brand new chemical bonding agent in the late 1970's. After extensive testing and reformulations, the first MM-1 bonding agent evolved into MM-4. This proprietary bonding agent increased adhesion so significantly that it was immediately declared a 鎼坕racle. The Miracle Method was born and the same MM-4 formula has now been used successfully around the world for nearly 30 years. It remains the most significant advancement in the refinishing industry and separates Miracle Method from every other refinishing process.
Refinishing, A Green Alternative[1]
The demand for quality surface restoration has grown dramatically in the last three years as the public looks for Green Remodeling Alternatives.
Replacement of tubs, tile, and countertops results in the unnecessary waste and disposal of perfectly functional fixtures. These fixtures clog our landfills and require additional energy and generate more pollution to manufacture and transport new fixtures. On the other hand, refinishing effectively "recycles" these fixtures. Refinishing can make these fixtures look and feel like new while extending the useful life for another 10 to 15 years.
Services
Miracle Method refinishes and repairs a variety of surfaces to include:
Bathtub refinishing and repair Bathtub surfaces that can be refinished include porcelain, fiberglass, acrylic, cultured marble and clawfoot tubs.
Countertop refinishing and repair Countertop surfaces that can be refinished include laminate, Formica?, tile countertops, Corian?, Silestone?, cultured marble and bathroom vanities. Countertops can be dramatically changed by the addition of a bullnose profile to the edge.
Ceramic Tile Refinishing Tile countertops, tile walls, tile showers and floors and shower pans can all be refinished to look like new.
Natural Accents?[2] This new finish for countertops, vanities and ceramic tile gives the appearance of stone at a fraction of the cost of removal and replacement.
Walk In Tub conversions - The Easy Step?[3] bathtub to shower conversion creates a 24 wide by 9 deep opening to make entry and exit easier and safer for seniors and the physically challenged.
Slip Resistant Surfaces This option is available for bathtubs and shower pans reducing the risk of slip and fall.
Chip Repairs We can repair all types tubs and sinks
Color Changes Dated colors on...(and so on)

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