Топ-100

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Binary pulsar

A binary pulsar is a pulsar with a binary companion, often a white dwarf or neutron star. In at least one case, the double pulsar PSR J0737-3039, the companion star is another pulsar as well. Binary pulsars are one of the few objects which allow ...

                                               

Gravitational field

In physics, a gravitational field is a model used to explain the influence that a massive body has. The influence extends into the space around itself, producing a force on another massive body. Thus, a gravitational field is used to explain grav ...

                                               

Light clock

The light clock is a simple way of showing a basic feature of Special relativity. A clock is designed to work by bouncing a flash of light off a distant mirror and using its return to trigger another flash of light, meanwhile counting how many fl ...

                                               

Lorentz contraction

The Lorentz contraction, also called Length contraction, Fitzgerald contraction or Lorenz-Fitzgerald contraction, is the phenomenon that a moving object becomes shorter than it was when measured in its rest frame. This is because of relativistic ...

                                               

Lorentz factor

The Lorentz factor is the factor by which time, length, and mass change for an object moving at speeds close to the speed of light. It is named after the Dutch physicist Hendrik Lorentz. The equation is: γ = 1 − v c 2 {\displaystyle \gamma ={\fra ...

                                               

Michelson–Morley experiment

The Michelson–Morley experiment was a failed scientific experiment intended to find the presence and properties of a substance called aether, a substance believed to fill empty space. The experiment was done by Albert A. Michelson and Edward Morl ...

                                               

Minkowski spacetime

In special relativity, the Minkowski spacetime is a four-dimensional manifold, created by Hermann Minkowski. It has four dimensions: three dimensions of space and one dimension of time. Minkowski spacetime has a metric signature of, and describes ...

                                               

Principle of relativity

In physics, the principle of relativity is the requirement that the equations describing the laws of physics is as same as the all frames of reference. In 300 BCE, Greek philosopher Aristotle thought that heavy objects fall faster than objects th ...

                                               

Ultrarelativistic limit

Particles which go near the speed of light are called ultrarelativistic. The ultrarelativistic limit is the maximum velocity that a particle can move at. Albert Einstein found the equation for energy: E=mc². This means that energy is equal to a c ...

                                               

Wormhole

A wormhole is a theoretical passage through space creating a shortcut through time and space. It is not known whether or not they exist. Scientists believe that if wormholes existed they could not be made following any traditional scientific meth ...

                                               

String theory

String theory tries to model the four known fundamental interactions - gravitation, electromagnetism, strong nuclear force, weak nuclear force - together in one theory. This tries to resolve the alleged conflict between classical physics and quan ...

                                               

M-theory

M-theory is a new idea in small-particle physics that is part of superstring theory that was initially proposed by Edward Witten. The idea, or theory, often causes arguments among scientists, because there is no way to test it to see if it is tru ...

                                               

String (physics)

In string theory and theoretical physics, string s are hypothetical objects that are believed to be the elementary particles of the universe. If they exist, they would not be point-like particles, but rather 1-dimensional "strings" of energy that ...

                                               

Superstring theory

The Superstring theory is an approach to realize Einstein’s dream of a united theory of physics. It is a single unified theory that would be able to describe all of the forces at work in the universe. The Superstring theory is also known as the S ...

                                               

Doppler effect

The Doppler effect is a change in frequency and wavelength of a wave. It is caused by the change in distance between the thing creating the wave and whatever is measuring seeing or hearing the wave. Another word for "causer" is "sender" or "sourc ...

                                               

Interference

In physics, interference is the effect of wave functions. A single wave can interfere with itself, but this is still an addition of two waves. Two waves always interfere, even if the result of the addition is complicated or not remarkable. Someth ...

                                               

Longshore drift

Longshore drift is the process of the ocean currents forcing sand and other material down a beach. The material is first pulled into the currents by the backwash the water going out to sea and is then pushed back up the beach by the swash the wat ...

                                               

Pair production

In physics, pair production is what happens when a photon interacts with the nucleus of an atom, instead of the electron like in lower level x-ray interactions. The photon gives its energy to the nucleus and then creates a pair of positively and ...

                                               

Phase velocity

The phase velocity of a wave is the rate at which the phase of any one frequency component of the wave travels. Any given phase of the wave for example, the crest will appear to travel at the phase velocity. The phase velocity is given in terms o ...

                                               

Plane wave

                                               

Reflection

Reflection is the change in direction of a wave at a boundary between two different media, so that the wave moves back into the medium it came from. The most common examples include the reflection of light, sound and water waves. Specular reflect ...

                                               

Refraction

Refraction is the change in direction of a wave, caused by the change in the waves speed. Examples of waves include sound waves and light waves. Refraction is seen most often when a wave passes from one transparent medium to another transparent m ...

                                               

Ultra high frequency

Ultra High Frequency is a electromagnetic radiation. Especially its frequency is between 300 MHz and 3 GHz. Because of short wavelength, UHF has strong directivity and it has small area. UHF is commonly used for television signals. It is strong e ...

                                               

Wave (physics)

Waves are found everywhere in the natural world. Examples of waves are: Sound. Radio waves. Water waves. Seismic waves earthquakes. Electromagnetic waves. Light waves.

                                               

Waveform

The waveform is the shape of a wave as it travels. There are many different waveforms. They are usually a shape which is repeated over and over. A common waveform is the sine wave. It is normally not possible to see a waveform without some device.

                                               

List of Brazilian scientists

This is a list of Brazilian scientists. Adib Jatene, was Minister of Health, heart surgeon, died in 2014. Fritz Muller, known for Mullerian mimicry, Evolutionary biology, died in 1897. Warwick Estevam Kerr, is a member of the Brazilian Academy of ...

                                               

List of Chinese scientists

                                               

List of Egyptian scientists

                                               

List of Indian scientists

                                               

French Civil Aviation University

The French Civil Aviation University, also known as ENAC, is a French public aeronautical grande ecole. It was created on 28 August 1949. It has locations in Biscarosse, Carcassonne, Castelnaudary, Chateau-Arnoux-Saint-Auban, Grenoble, Melun, Mon ...

                                               

Airexpo

Airexpo is a French airshow created in 1987. It is the third most important airshow of France. It is organized by the students of the universities Ecole nationale de laviation civile and those of the Institut superieur de laeronautique et de lesp ...

                                               

ENAC Alumni

ENAC Alumni is an alumni association based in Toulouse, Midi-Pyrenees. It was started by Robert Aladenyse, in 1987. The main mission of the association is to gather the alumni of the French Civil Aviation University. In 2013, it has almost 20.000 ...

                                               

ENAC Foundation

The ENAC Foundation has been created in 2012. It is to promote scientific and public interest activities in aviation, aerospace and aeronautics.

                                               

France Aviation Civile Services

France Aviation Civile Services, previously DSNA Services, is a consulting company, started by the DGAC and the ENAC in 2013. It gives to clients the expertise of French civil aviation in regulation, security and air navigation. Its President is ...

                                               

Construction

Construction is the process of erection or assembly of any building or infrastructure on a site. In general, there are three types of construction: Heavy / civil construction. Building construction. Industrial construction. Building construction ...

                                               

Arch

An arch is an opening in a building that is curved on top to distribute the weight. The curved part can be round, like part of a circle, or pointed, like two parts of circles next to each other. Arches are often used where buildings are made of m ...

                                               

Attic

The attic is the highest part of a house, it is directly below the roof. It is sometimes used as storage. Some people have "loft conversions" so that they can sleep in it. Attics can be hard to reach, which is why many of them are not used. They ...

                                               

Attic ladder

An attic ladder or loft ladder is a collapsible ladder which is attached with the floor of an attic and ceiling of the floor below the attic. Fire departments also use a similar attic ladders as an equipment.

                                               

Barn raising

A barn raising, also historically called a raising bee or rearing in the U.K., is a collective action of a community, in which a barn for one of the members is built or rebuilt by members of the community. Barn raising was common in 18th- and 19t ...

                                               

Basement

The basement is the lowest room in some buildings, almost always below the ground. There is another type of basement, called a subcellar. A subcellar is just like a basement, but more below it. Most basements have lights.

                                               

Building material

Building material is any material which is used for a construction purpose. Many naturally occurring substances, such as clay, sand, wood and rocks, even twigs and leaves have been used to construct buildings. Apart from naturally occurring mater ...

                                               

Complutense University of Madrid

The Complutense University of Madrid is one of the oldest universities in the world and the top public university in Spain. It is located on a sprawling campus that occupies the entirety of the Ciudad Universitaria district of Madrid, with annexe ...

                                               

Crawl space

                                               

Ferrocement

Ferrocement is both a method and a material used in building or sculpting with cement, sand, water and wire or mesh material. It is often called the thin shell. Thin shell ferrocement offers strength and economy and can be used in many ways inclu ...

                                               

Foundation (engineering)

A foundation is the lowest part of a building. A building needs a strong foundation if it is to stand for a long time. A heavier building or softer soil needs a deeper foundation. To make a foundation, engineers dig a trench in the ground. They d ...

                                               

Heavy equipment

Heavy equipment are heavy-duty vehicles. They are specially designed for completing construction tasks involving digging. Other known names for heavy equipment are heavy machines, heavy trucks, construction equipment, engineering equipment, heavy ...

                                               

Jackhammer

                                               

Level (device)

Level is a device used to measure true horizontal or relative heights, frequently used in surveying and construction: Laser line level. Reed level. Spirit level or bubble level. Dumpy level.

                                               

Masonry

Masonry is the building of structures from individual units laid in and bound together by mortar. The term "masonry" can also refer to the units themselves. The common materials of masonry construction are brick, stone such as marble, granite, tr ...

                                               

Opus isodomum

Opus isodomum is an ancient technique of wall building. It uses perfectly cut, completely regular square stone blocks of equal height, and sometimes of the same length. In classical antiquity this technique was perfected and widely used, especial ...

Encyclopedic dictionary

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Pino - logical board game which is based on tactics and strategy. In general this is a remix of chess, checkers and corners. The game develops imagination, concentration, teaches how to solve tasks, plan their own actions and of course to think logically. It does not matter how much pieces you have, the main thing is how they are placement!

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