Archive for light
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Humphry Davy was born in Cornwall, England, in 1778 and was known as a chemist. Davy used electric current from a voltaic pile to perform early forms of electrolysis and discovered sodium, potassium, barium, calcium, strontium and magnesium. He was the first to isolate barium and boron. He created the first electric arc lamp by […]
Sound pitch is determined by the frequency of the sound waves. Short, fast waves produce high pitched sound and long, slow waves produce low pitched sound. This presents the idea that harmony is created by rhythm. Watch Adam Neelys explanation of how pitch can be created by rhythm: Harmonic Polyrhythms Explained! [ AN’s Bass Lessons […]
Louis Pasteur was born in 1822 in France and is known for discovering pasteurization (heating beverages to kill bacteria in them) and vaccination. Vaccination is the process of exposing a patient to a vaccine, which causes a low level infection, stimulating the immune system to develop antibodies, creating an immunity against the disease. He explained […]
FOUR ELEMENTS Plato defined four basic elements as earth, water, air, and fire. In his analysis of geometry he defined five regular solids. He paired up the four elements with four of the five regular solids and this suggested to him that there might be another element. He assigned earth to the cube, water to […]
Photonic crystal fibers (PCFs) are microstructured optical fibers that use tiny air hole capillaries arranged in a pattern around the center of the fiber. This makes the light propagation far superior to conventional fibers, requiring fewer repeaters and less amplification over long distances. PCFs are also capable of handling high energy lasers efficiently. What is […]
When ripples in the fluid-like free electrons in conducting metals form oscillations, they can act like virtual particles and are called “plasmons”, a category of quasiparticles. Controlling plasmons which interact with light allows fast and efficient modulation of light based communications. What is a plasmon? – [nanoscale.blogspot.com] A plasmon is a collective excitation of the […]
Born around 1170 in Suffolk, England, Robert Grosseteste was a student of many subjects who became a bishop in the Church of England. He was proficient in the Greek language, translating many works into Latin. He performed experiments with light and mirrors and made lenses from bowls filled with water to study refraction. His investigation […]
The ripple in space that we call a photon, or wave/particle of light, does have some mass, but it is so small that is almost zero. It normally takes millions of photons just to measure any impact at all. Joint research based in Finland shows that an island of superconductivity can amplify the ability to […]
Cuttlefish dynamically change both the color and texture of their skin to create camouflage that matches the environment around them. A University of Nebraska research team is doing the same thing using colloids in a multilayered structure. When light hits the colloid layer, heat convection reassembles it to replicate the light pattern. This technique is […]
3D printing has taken a revolutionary step forward with a continuous printing technique that draws material from a liquid pool, controlled with a pattern drawn by light. The CLIP process lifts a forming object from a pool of resin while a beam of light controls the formation by projecting a sequence of images on the […]