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If I have the gift of prophecy and can fathom all mysteries and all knowledge, and if I have a faith that can move mountains, but do not have love, I am nothing. - 1 Corinthians 13:2
originally posted by: arpgme
If I have the gift of prophecy and can fathom all mysteries and all knowledge, and if I have a faith that can move mountains, but do not have love, I am nothing. - 1 Corinthians 13:2
An electric arc is the form of electric discharge with the highest current density.
The maximum current through an arc is limited only by the external circuit, not by the arc itself.
The voltage across an arc decreases as the current increases, giving it a dynamic negative resistance characteristic.
Where a sustained arc is required, this characteristic requires some external circuit element to stabilise current, which would otherwise increase bounded only by the supply limit.
In high-energy circuits arc suppression may be required to prevent damage to contacts.
Arc suppression is a method of attempting to reduce or eliminate the electrical arc. There are several possible areas of use of arc suppression methods, among them metal film deposition...
A black body is an idealized physical body that absorbs all incident electromagnetic radiation, regardless of frequency or angle of incidence.
The idea of a black body originally was introduced by Gustav Kirchhoff in 1860 as follows:
...the supposition that bodies can be imagined which, for infinitely small thicknesses, completely absorb all incident rays, and neither reflect nor transmit any. I shall call such bodies perfectly black, or, more briefly, black bodies.
An ideal body is now defined, called a blackbody. A blackbody allows all incident radiation to pass into it (no reflected energy) and internally absorbs all the incident radiation (no energy transmitted through the body). This is true for radiation of all wavelengths and for all angles of incidence. Hence the blackbody is a perfect absorber for all incident radiation.
cardinal points consist of three pairs of points located on the optical axis of a rotationally symmetric, focal, optical system. These are the focal points, the principal points, and the nodal points. For ideal systems, the basic imaging properties such as image size, location, and orientation are completely determined by the locations of the cardinal points; in fact only four points are necessary.
The only ideal system that has been achieved in practice is the plane mirror.
[A plane mirror makes an image of objects in front of it; these images appear to be behind the plane in which the mirror lies. A straight line drawn from part of an object to the corresponding part of its image makes a right angle with, and is bisected by, the surface of the plane mirror. The image formed by a plane mirror is always virtual (meaning that the light rays do not actually come from the image), upright, and of the same shape and size as the object it is reflecting. A virtual image is a copy of an object formed at the location from which the light rays appear to come. However, the image is a laterally-inverted "mirror image" of the object. If a person is reflected in a plane mirror, the image of his right hand appears to be the left hand of the image.
Plane mirrors are the only type of mirror for which a real object always produces an image that is virtual, erect and of the same size as the object. Virtual objects produce real images, however. The focal length of a plane mirror is infinity; its optical power is zero.]
however the cardinal points are widely used to approximate the behavior of real optical systems. Cardinal points provide a way to analytically simplify a system with many components, allowing the imaging characteristics of the system to be determined by simple calculation.
originally posted by: Wifibrains
There is this One door....
... it can take you to a place full of mirrors.
Everywhere you look you see your own reflection. Everyone is saying the same thing. Some strive to attain the experience, while some...
The door can behave like a simulator, re-shaping present reality into a complete oneness experience.
One is one with one when one arrives through the one door.
The axis mundi (also cosmic axis, world axis, world pillar, columna cerului, center of the world, world tree), in religion or mythology, is the world center or the connection between Heaven and Earth.
As the celestial pole and geographic pole, it expresses a point of connection between sky and earth where the four compass directions meet. At this point travel and correspondence is made between higher and lower realms.