In Greek age, Thales found static electricity when he was cleaning his amber. But at that time, they did not pay attention to this and research it. They just knew that rubbing something made a pulling force. Earnest research into static electricity was started in the 17th century, when Otto Von Guericke made the first friction generator. And in the 18th century, Coulomb started research into a fixed quantity of static electricity. Benjamin Franklin associated static electricity with storms. In 1832 Michael Faraday published the results of his experiment on the identity of electricity. This report proved that the electricity made by using a magnet, voltaic electricity produced by a battery, and static electricity are all the same. Since Faraday's result, the history of static electricity can be thought as the study of electricity in general.
Many situations can cause static electricity.
Static discharge is excess charge that is neutralized by a flow of charges from or to the surroundings. Positive charges get
electrons from the surroundings, and negative charges lose their electrons to the surroundings.
The feeling of a static electric shock is caused by the stimulation of nerves as the neutralizing current flows through the human body. Due to the presence of much water in the body, the charge is generally not enough to cause a dangerously high current. Lightning is also an example of static discharge. A cloud gets a very huge charge by clashing with other clouds. It gives off the excess charge to the ground. But this huge charge never occurs in the human's surroundings naturally, unless he is struck by the lightning.
Despite the apparently harmless nature of static electricity, there can be significant risks in research, because a large charge can break down the equipment.
Submandibular gland
The submandibular glands are salivary glands. They are under the bottom part of the mouth.
Military diving
Military diving is underwater diving done by members of armed forces for military purposes.
Any method of diving may be used. It is the military purpose that makes it military diving.
Military diving for offensive purposes is usually done using rebreathers as they do not make much bubbles which can be seen by the enemy. These divers may be called frogmen or combat divers.
Othe military divers do work to remove obstructions and explosive devices like mines. They are called clearance divers.
Military divers may also do inspections and repair work on the bottoms of ships, and underwater work in support of military engineering operations.
Dagens Næringsliv
Dagens Næringsliv is one of Norway's main newspapers. The newspaper was first named "Norges Sjøfartstidende". It was founded in 1889.
In July 2015, one former journalist said that he had done plagiarism, in several articles he wrote for the newspaper, said the website of the trade union, Norsk Journalistlag.
FSK
FSK ("Forsvarets spesialkommando") is the name of the special forces of Norway's Ministry of Defence. They were established in 1981.
Piping and instrumentation diagram
A piping and instrument diagram (P&ID) is a simplified illustration or diagram of a process. It shows the required functional equipment and instrumentation to make the process work. Typically, this document is the basis of design for plant engineering.
Zifeng Tower
Nanjing Greenland Financial Center or Greenland Square Zifeng Tower is a skyscraper in Nanjing, China. It is 459 meters (1476 feet) tall and has 89 floors. It was built in 2009 and is one of the tallest buildings in the world
Modular arithmetic
Modular arithmetic, sometimes also called clock arithmetic, is a way of doing arithmetic with integers. Much like hours on a clock, which repeat every twelve hours, once the numbers reach a certain value, called the "modulus", they go back to zero.
In general, given a modulus "formula_1", we can do addition, subtraction and multiplication on the set formula_2 in a way that "wrap around" "formula_1". This set is sometimes represented by the symbol formula_4, and called the set of integers modulo "formula_1".
People talked about modular arithmetic in many ancient cultures. For instance, the Chinese remainder theorem is many centuries old. The modern notation and exact definition of modular arithmetic were first described by Carl Friedrich Gauss.
Modular arithmetic can be used to show the idea of congruence. In general, given a positive integer "n", two integers "a" and "b" are congruent modulo n, if they have the same remainder when both are divided by "n". Congruence can be written this way:
The number "n" is called the modulus. Another definition of congruence, that means the same thing but is sometimes more useful, is that the two integers are congruent modulo n if the difference ("a" - "b") is an integer multiple of "n". That is, if "n" is a factor of ("a" - "b"), then "a" and "b" are congruent mod "n".
For example:
The remainder when 32 is divided by 7 is 4, and the remainder when 11 is divided by 7 is also 4. This tells us that they are congruent—when the modulus is 7.
We can use this example with the other definition too. The difference, ("a" - "b"), is 32 - 11 = 21. This shows the two numbers are congruent, because 21 = 3 × 7 and 7 is a factor of 21.
Modular arithmetic is useful in many fields, and its applications include RSA algorithm in cryptography, primality testing in computer science, and 12-tone arithmetic in music. It is often used in calculating checksums and check digits.
Live – Friday the 13th
Live – Friday the 13th is a live album released on Sept. 20th, 2005. The album was released as a live CD/DVD album featuring all 12 original songs from Pop band Maroon 5's hit debut called "Songs About Jane". This album has been released with the "Copy Control" protection system in some regions. The CD has the length of 77:58.
Maroon 5 performed in Santa Barbara, California on Friday, May 13th of 2005.
The songs from the hit debut album by Maroon 5 called "Songs About Jane" were all featured performed live on this album. Two songs are performed called "Hello" by band "Oasis" (cover), and "Ain't No Sunshine" (cover).
Tropicana Field
Tropicana Field is a domed baseball stadium that serves as the home field for the Tampa Bay Rays since 1998. The stadium was opened in 1990 in hopes of snatching a team away from another city. Two teams almost moved to Tampa to call Tropicana Field home; they were the Chicago White Sox and the San Francisco Giants. They stadium also served as the former home for the NHL team, Tampa Bay Lightning and the former home for the AFL's Tampa Bay Storm. Current Rays manager, Joe Maddon, has nicknamed the stadium "The Pit". While the fans nicknamed it "The Trop". The former name of the stadium was the Florida Suncoast Dome. It has also been called the Thunderdome.
Jin Mao Tower
Jin Mao Tower is a skyscraper in Shanghai, China. It is tall. It has 88 floors. It was built between 1994 and 1999 and is one of the tallest buildings in the world.
Two International Finance Centre
Two International Finance Centre (abbr. 2 IFC, branded as "ifc") is a skyscraper in Hong Kong. It is 415 meters (1362 feet) tall and has 88 floors. It was built in 2003 and is one of the tallest buildings in the world
Gentoo penguin
The gentoo penguin ("Pygoscelis papua") is a species of penguin easily recognized by the white stripe across its head. They are the largest penguins of the stiff-tailed family, which also makes them the largest penguin except the two giant penguins, the emperor penguin and the king penguin.
The gentoo penguin is, on average, 5 kilograms in weight and 80 centimeters in height, but can range from 8.5 kg to 4.5 kg and 51 to 91 cm. They have very large male reproductive organs, and are also the fastest at swimming underwater among the penguins, reaching speeds of 36 kilometers per hour.