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Bubble Ring
A bubble ring, or toroidal bubble, is an underwater vortex ring where an air bubble occupies the core of the vortex, forming a ring shape. The ring of air as well as the nearby water spins Toroidal and poloidal, poloidally as it travels through the water, much like a flexible bracelet might spin when it is rolled on to a person's arm. The faster the bubble ring spins, the more stable it becomes. The physics of vortex rings are still under active study in fluid dynamics. Devices have been invented which generate bubble vortex rings. Physics As the bubble ring rises, a lift force pointing downward that is generated by the vorticity acts on the bubble in order to counteract the buoyancy force. This reduces the bubble's velocity and increases its diameter. The ring becomes thinner, despite the total volume inside the bubble increasing as the external water pressure decreases. Bubble rings fragment into rings of spherical bubbles when the ring becomes thinner than a few millimetres. ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Bubble Ring In Sunlight (cropped)
Bubble, Bubbles or The Bubble may refer to: Common uses * Bubble (physics), a globule of one substance in another, usually gas in a liquid ** Soap bubble * Economic bubble, a situation where asset prices are much higher than underlying fundamentals Arts, entertainment and media Fictional characters * Bubble, List of Absolutely Fabulous characters#Bubble and Katy Grin, a character in ''Absolutely Fabulous'' * Bubble, a character in the animated series ''Adventure Time (season 5)#ep121, Adventure Time'' episode "BMO Lost" * Bubble, in the video game ''Clu Clu Land'' * Bubbles (The Wire), Bubbles (''The Wire'') * Bubbles (Trailer Park Boys), Bubbles (''Trailer Park Boys'') * Bubbles Utonium, in ''The Powerpuff Girls'' ** Bubbles (Miyako Gotokuji), in ''Powerpuff Girls Z'' * Bubbles (The Adventures of Little Carp), Bubbles (''The Adventures of Little Carp'') * Bubbles the Clown, a doll used in the BBC's Test Card F * Bubbles, an oriole from the ''Angry Birds'' franchise * Bubbles ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Smoke Ring
A smoke ring is a visible vortex ring formed by smoke in a clear atmosphere. Smoking, Smokers may blow smoke rings from the mouth, intentionally or accidentally. Smoke rings may also be formed by sudden bursts of fire (such as lighting and immediately putting out a lighter, cigarette lighter), by shaking a smoke source (such as an incense stick) up and down, by firing certain types of artillery, or by the use of special devices, such as vortex ring guns and vortex ring toys. The head of a mushroom cloud is a large smoke ring. A smoke ring is commonly formed when a puff of smoke is suddenly injected into clear air, especially through a narrow opening. The outer parts of the puff are slowed by the still air (or by edges of the opening) relative to the central part, imparting it the characteristic poloidal flow pattern. The smoke makes the ring visible, but does not significantly affect the flow. The same phenomenon occurs with any fluid, producing vortex rings which are inv ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Carousel Feeding
A carousel or carrousel (mainly North American English), merry-go-round ( International English), or galloper (British English) is a type of amusement ride consisting of a rotating circular platform with seats for riders. The seats are traditionally in the form of rows of animal figures (usually horses) mounted on posts, many of which move up and down to simulate galloping. Sometimes chair-like or bench-like seats are used, and occasionally mounts can take the form of non-animals, such as airplanes or cars. Carousel rides are typically accompanied by looped circus music. The word ''carousel'' derives from the French word ''carrousel'', meaning ''little battle'', a reference to European tournaments of the same name starting in the 17th century. Participants in these tournaments rode live horses and competed in various cavalry skill tests, such as ring jousting. By the end of that century, simple machines were created in which wooden horses were suspended from a spinning wh ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Bubble Pipe
A bubble pipe is a toy shaped like a tobacco pipe, intended to be used for blowing soap bubbles. Design Bubble pipes are one of the original bubble toys. Most bubble pipes are made of plastic and therefore cannot be used for actual smoking. They are usually brightly colored, and sometimes feature fanciful designs, including multiple bowls (see picture). Children sometimes use bubble pipes in order to imitate the perceived look of adults. History An 18th-century painting by Jean-Baptiste-Siméon Chardin shows a young boy blowing a bubble out of what seems to be a pipe. In 1918, John L. Gilchrist filed a patent for a style of bubble pipes that can be produced quickly and easily. Bubble pipes were one of the first and original mass productions of bubble blowers that became popular so that kids could imitate an adult smoker. In the 1940s, the packaging of the bubble pipes were known to be colorful and decorated in a bright style. See also *Bubble wand *Candy cigarette Cand ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Free-diving
Freediving, free-diving, free diving, breath-hold diving, or skin diving, is a mode of underwater diving that relies on apnea, breath-holding until resurfacing rather than the use of breathing apparatus such as scuba set, scuba gear. Besides the limits of Apnea, breath-hold, immersion in water and exposure to high ambient pressure also have physiological effects that limit the depths and duration possible in freediving. Examples of freediving activities are artisanal fishing, traditional fishing techniques, competitive and non-competitive freediving, competitive and non-competitive spearfishing and freediving photography, synchronised swimming, underwater football, underwater rugby, underwater hockey, underwater target shooting and snorkeling. There are also a range of "competitive apnea" disciplines; in which competitors attempt to attain great depths, times, or distances on a single breath. Historically, the term ''free diving'' was also used to refer to scuba diving, due to th ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Scuba Divers
Scuba diving is a mode of underwater diving whereby divers use breathing equipment that is completely independent of a surface breathing gas supply, and therefore has a limited but variable endurance. The word ''scuba'' is an acronym for "Self-Contained Underwater Breathing Apparatus" and was coined by Christian J. Lambertsen in a patent submitted in 1952. Scuba divers carry their own source of breathing gas, affording them greater independence and movement than surface-supplied divers, and more time underwater than freedivers. Although the use of compressed air is common, other gas blends are also used. Open-circuit scuba systems discharge the breathing gas into the environment as it is exhaled and consist of one or more diving cylinders containing breathing gas at high pressure which is supplied to the diver at ambient pressure through a diving regulator. They may include additional cylinders for range extension, decompression gas or emergency breathing gas. Closed ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Bait Ball
A bait ball, or baitball, occurs when small fish swarm in a tightly packed spherical formation about a common centre. It is a last-ditch defensive measure adopted by small schooling fish when they are threatened by predators. Small schooling fish are eaten by many types of Predation, predators, and for this reason they are called bait fish or forage fish. For example, sardines group together when they are threatened. This instinctual behaviour is a defence mechanism, as lone individuals are more likely to be eaten than an individual in a large group. Sardine bait balls can be in diameter and extend to a depth of . The bait balls are short-lived and seldom last longer than 10 minutes. However, bait balls are also conspicuous, and when schooling fish form a bait ball, they can draw the attention of many other predators. As a response to the defensive capabilities of schooling fish, some predators have developed sophisticated countermeasures. These countermeasures can be spectac ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Forage Fish
Forage fish, also called prey fish or bait fish, are small pelagic fish that feed on planktons (i.e. planktivores) and other small aquatic organisms (e.g. krill). They are in turn preyed upon by various predators including larger fish, seabirds and marine mammals, this making them keystone species in their aquatic ecosystems. The typical ocean forage fish feed at the lower trophic level of the food chain, often by filter feeding. They include particularly fishes of the order Clupeiformes (herrings, sardines, shad, hilsa, menhaden, anchovies, and sprats), but also other small fish, including halfbeaks, Atheriniformes, silversides, Smelt (fish), smelt such as capelin and goldband fusiliers. Forage fish compensate for their small size by forming shoaling and schooling, schools. Some swim in synchronised grids with their mouths open so they can efficiently filter plankton. These schools can become immense Shoaling and schooling, shoals which move along coastlines and Fish migration, ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Shoaling And Schooling
In biology, any group of fish that stay together for social reasons are shoaling, and if the group is swimming in the same direction in a coordinated manner, they are schooling. In common usage, the terms are sometimes used rather loosely. About one quarter of fish species shoal all their lives, and about one half shoal for part of their lives. Fish derive many benefits from shoaling behaviour including defence against predators (through better predator detection and by diluting the chance of individual capture), enhanced foraging success, and higher success in finding a mate. It is also likely that fish benefit from shoal membership through increased hydrodynamic efficiency. Fish use many traits to choose shoalmates. Generally they prefer larger shoals, shoalmates of their own species, shoalmates similar in size and appearance to themselves, healthy fish, and kin (when recognized). The oddity effect posits that any shoal member that stands out in appearance will be preferen ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Humpback Whale
The humpback whale (''Megaptera novaeangliae'') is a species of baleen whale. It is a rorqual (a member of the family Balaenopteridae) and is the monotypic taxon, only species in the genus ''Megaptera''. Adults range in length from and weigh up to . The humpback has a distinctive body shape, with long pectoral fins and tubercles on its head. It is known for Cetacean surfacing behaviour, breaching and other distinctive surface behaviors, making it popular with whale watching, whale watchers. Males produce a complex Whale sound, song that typically lasts from 4 to 33 minutes. Found in oceans and list of seas, seas around the world, humpback whales typically animal migration, migrate between feeding areas towards the poles and breeding areas near the equator. They feed in Polar region, polar waters and migrate to tropics, tropical or subtropical waters to breed and give birth. Their diet consists mostly of krill and small fish, and they usually Bubble-net feeding, use bubbles to c ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Shimane Aquarium
is a prefectural public aquarium located in Hamada City and Gotsu City, Shimane Prefecture, Japan. It is managed and operated by the Shimane Aquarium Foundation. It is a member of the Japanese Association of Zoos and Aquariums (JAZA), and the aquarium is accredited as a designated facilities by the Ministry of Education, Culture, Sports, Science and Technology. History It opened on April 15, 2000. It is one of the largest aquariums in the Chugoku and Shikoku regions, and its concept is "From the Sea of Shimane to the Sea of Japan and the World". On November 13, 2008, the "Penguin Pavilion" opened on the west side of the main building, and in April 2008, during the construction of the Penguin Pavilion, an accident occurred in which the acrylic panels used for the aquarium tanks were damaged. The acrylic panels were custom-made, which delayed the construction schedule, and the opening was postponed from July 2008 to mid-November 2008. The Penguin Pavilion's water tank uses an i ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
