Subject:
All Disciplines Arts & Humanities Biology & Life Sciences Business & Economics Chemistry & Materials Science Computer Science & Mathematics Engineering Environmental & Earth Sciences Medicine & Pharmacology Physical Sciences Public Health & Healthcare Social Sciences
Sort:
Hottest Latest Alphabetical (A-Z) Alphabetical (Z-A)
Type:
All Topic Review Biography
Topic Review
Eye Chart
An eye chart, or optotype, is a chart used to measure visual acuity. Eye charts are often used by health care professionals, such as optometrists, physicians or nurses, to screen persons for vision impairment. Ophthalmologists, physicians who specialize in the eye, also use eye charts to monitor the visual acuity of their patients in response to various therapies such as medications or surgery. The chart is placed at a standardized distance away from the person whose vision is being tested. The person then attempts to identify the symbols on the chart, starting with the larger symbols and continuing with progressively smaller symbols until the person cannot identify the symbols. The smallest symbols that can be reliably identified is considered the person's visual acuity. The Snellen chart is the most widely used. Alternative types of eye charts include the logMAR chart, Landolt C, E chart, Lea test, Golovin–Sivtsev table, the Rosenbaum chart, and the Jaeger chart. As previously mentioned, eye charts measure visual acuity. Eye charts do not provide doctors with information on eye diseases such as glaucoma, problems with the retina, or loss of peripheral vision.
  • 587
  • 18 Nov 2022
Topic Review
Plasma-Enhanced Chemical Vapor Deposition
Plasma-enhanced chemical vapor deposition (PECVD) is a chemical vapor deposition process used to deposit thin films from a gas state (vapor) to a solid state on a substrate. Chemical reactions are involved in the process, which occur after creation of a plasma of the reacting gases. The plasma is generally created by radio frequency (RF) (alternating current (AC)) frequency or direct current (DC) discharge between two electrodes, the space between which is filled with the reacting gases.
  • 468
  • 18 Nov 2022
Topic Review
FYFT S-Series Unmanned Blimp
FYFT S-series unmanned blimps are Chinese UAVs developed by Qingdao Co., Ltd. Fei-Yu (meaning Flying Universe) Aviation Science and Technology Co., Ltd. (FYFT, 青岛飞宇有限公司), and these unmanned blimps are named after their respective length. For example: if an S1 series blimp is 11 meter long, then it is named S1-1100, because 11 meter is equal to 1100 centimeters. S-series UAV is intended for aerial survey / photography / cinematography, with S stands for Survey.
  • 214
  • 18 Nov 2022
Topic Review
Lugnut (Transformers)
Lugnut is the name of several fictional characters from the Transformers universe. Both are Decepticon jets who are loyal to Megatron.
  • 1.8K
  • 18 Nov 2022
Biography
Charlie Taylor
Charles Edward Taylor (May 24, 1868 – January 30, 1956) was an American inventor, mechanic and machinist. He built the first aircraft engine used by the Wright brothers and was a vital contributor of mechanical skills in the building and maintaining of early Wright engines and airplanes.[1][2] Born in a log cabin on May 24, 1868, in Cerro Gordo, Illinois to William Stephen Taylor and Mary J
  • 409
  • 18 Nov 2022
Biography
Harry Humphries
Harry R. Humphries (born November 17, 1940) is a former United States Navy SEAL who currently works as a consultant and actor on Hollywood films. After graduating from Admiral Farragut Academy and attending Rutgers University in New Jersey, Humphries joined the Navy, where he was assigned to UDT 22 and SEAL Team 2. In 1971, Humphries left the Navy with an Honorable Discharge. After a career with
  • 661
  • 18 Nov 2022
Biography
Charles Duncan Jr.
Charles William Duncan Jr. (born September 9, 1926) is an American entrepreneur, administrator, and politician best known for serving as U.S. Secretary of Energy on the Cabinet of President Jimmy Carter from 1979 to 1981. He had previously served as Carter's United States Deputy Secretary of Defense during the Iranian Revolution. Earlier, Duncan had run the family business, Duncan Coffee Company
  • 620
  • 18 Nov 2022
Biography
Robert Stuart Jamieson
Robert Stuart (Stu) Jamieson (February 26, 1922 - September 23, 2006) was a musician, author, engineer, inventor, and patent agent. He was a dual-citizen of both Canada and the United States , and served in the 90th Chemical Mortar Battalion of the U.S. Army during the Second World War.[1] As a musician, he is credited with preserving Anglo-American, African-American, and Chinese folk music for
  • 414
  • 18 Nov 2022
Topic Review
Lasersaur
Lasersaur is an open source laser cutter which was developed by NORTD Labs. Nortd Labs started shipping Lasersaur alpha kits in late 2010 after successful funding of the project in July 2010 on Kickstarter. Currently the project is funded via donations from their website or by purchasing part kits.
  • 324
  • 18 Nov 2022
Biography
Andrew Jenike
Dr. Andrew "Andy" W. Jenike (16 April 1914 - 8 August 2003) was an American engineer who developed and expanded the science of bulk material handling. He founded and served as company president for engineering consulting firm Jenike & Johanson, Inc. and published Utah Engineering Experiment Station Bulletins 123 and 108, which introduce the idea of mass flow. Andrew Jenike was born in Poland
  • 396
  • 18 Nov 2022
  • Page
  • of
  • 678
Featured Entry Collections
>>

Featured Books

>>
Encyclopedia of Social Sciences
Encyclopedia of COVID-19
Encyclopedia of Fungi
Encyclopedia of Digital Society, Industry 5.0 and Smart City
ScholarVision Creations
Feedback