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English Wikipedia references for Du.edu 41-60 of 382
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| Michelle Kwan Michelle Wingshan Kwan (born July 7, 1980) is an American figure skater. She has won nine U.S. championships, five World Championships, and two Olympic medals. She has remained competitive for over a decade and is the most decorated figure skater in U.S. history. Known for her consistency and expressive artistry on ice, she is widely considered one of the greatest figure skaters of all time. Michelle_Kwan | |
| Railroad switch This article primarily uses North American terminology. British and Commonwealth terms are given in parentheses.A railroad switch, turnout or [ points is a mechanical installation enabling railway trains to be guided from one track to another at a railway junction. points (switch rails or point blades), lying between the diverging outer rails (the stock rails). These points can be moved laterally into one of two positions so as to determine whether a train coming from the narrow e Railroad_switch | |
| Action potential An action potential (also known as a nerve impulse or a spike) is a self-regenerating wave of electrochemical activity that allows excitable cells (such as muscle and nerve cells) to carry a signal over a distance. It is the primary electrical signal generated by nerve cells, and arises from changes in the permeability of the nerve cell's axonal membranes to specific ions. Action potentials are pulse-like waves of voltage that travel along several types of cell membranes. The best-unde Action_potential | |
| Semaphore line A semaphore telegraph, optical telegraph, shutter telegraph chain, Chappe telegraph, or Napoleonic semaphore is a system of conveying information by means of visual signals, using towers with pivoting shutters, also known as blades or paddles. Information is encoded by the position of the mechanical elements; it is read when the shutter is in a fixed position. Semaphore_line | |
| Ellipse Talk:Ellipse | |
| History of Florida history of Florida can be traced back to when the first Native Americans began to inhabit the peninsula as early as 14,000 years ago. Recorded history begins with the arrival of Europeans to Florida, beginning with the Spanish explorer Juan Ponce de León, who explored the area in 1513. History_of_Florida | |
| Thermal radiation Thermal radiation is electromagnetic radiation emitted from the surface of an object which is due to the object's temperature. An example of thermal radiation is the infrared radiation emitted by a common household radiator or electric heater. A person near a Thermal_radiation | |
| Spiritual (music) Spirituals (or Negro spirituals) are religious songs which were created by enslaved African people in America. Spiritual_(music) | |
| Feng shui Feng shui ( fung′-shway′, formerly fung′-shoo-ee; ) is an ancient Chinese system of aesthetics believed to use the laws of both Heaven (astronomy) and Earth (geography) to help one improve life by receiving positive qi. The original designation for the discipline is Kan Yu (; literallyTao of heaven and earth).The term feng shui literally translates as "wind-water" in English. This is a cultural shorthand taken from the following passage of the Zhangshu (Book of Burial) by Guo Pu of the Jin Dynasty: Feng_shui | |
| Spherical harmonics mathematics, the spherical harmonics are the angular portion of a set of solutions to Laplace's equation. Represented in a system of spherical coordinates, Laplace's spherical harmonics are a specific set of spherical harmonics which forms an orthogonal system, first introduced by Pierre Simon de Laplace. Spherical_harmonics | |
| History of the telescope The earliest known working telescopes appeared in 1608 and are credited to Hans Lippershey. Among many others who claimed to have made the discovery were Zacharias Janssen, spectacle-maker in Middelburg, and Jacob Metius of Alkmaar. The design of these early refracting telescopes consisted of a convex objective lens and a concave eyepiece. History_of_the_telescope | |
| Bridge Talk:Bridge | |
| Euclid's Elements Euclid's Elements (Greek:mathematical and geometric treatise consisting of 13 books written by the Greek mathematician Euclid in Alexandria circa 300 BC. It comprises a collection of definitions, postulates (axioms), propositions (theorems and constructions), and mathematical proofs of the propositions. Euclid's_Elements | |
| Forecasting Forecasting is the process of estimation in unknown situations. Prediction is a similar, but more general term. Both can refer to estimation of time series, cross-sectional or longitudinal data. Usage can differ between areas of applicationhydrology, the terms "forecast" and "forecasting" are sometimes reserved for estimates of values at certain specific future times, while the term "prediction" is used for more general estimates, such as the number of times floods will occur over a long period. Forecasting | |
| Vacuum tube Talk:Vacuum_tube | |
| Ludlow massacre The Ludlow massacre refers to the violent deaths of 20 people, 11 of them children, during an attack by the Colorado National Guard on a tent colony of 1,200 striking coal miners and their families at Ludlow, Colorado on April 20, 1914. These deaths occurred after a day-long fight between strikers and the Guard. Ludlow_massacre | |
| Q.E.D. Talk:Q.E.D. | |
| Game port The game port is the traditional connector for video game input devices on x86-based PCs. Since about 1990, the game port has usually been integrated with a PC I/O or sound card, either ISA or PCI, or as an on-board feature of some motherboards; before that, it was usually on a dedicated ISA card. Game_port | |
| Chesil Beach Chesil Beach, sometimes called Chesil Bank, in Dorset, southern England. is one of three major shingle structures in Britain, often identified as a tombolo, although research into the geomorphology of the area has revealed that it is in fact a barrier beach which has "rolled" landwards, joining the mainland with Portland Bill, giving the appearance of a tombolo. Chesil_Beach | |
| Railway signal signal is a mechanical or electrical device erected beside a railway line to pass information relating to the state of the line ahead to train drivers/engineers. The driver interprets the signal's indication and acts accordingly. Typically, a signal might inform the driver of the speed at which the train may safely proceed, or it may instruct the driver to stop. Railway_signal |
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