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  2. Pattern welding - Wikipedia

    en.wikipedia.org/wiki/Pattern_welding

    The blade shows a chevron pattern with opposing twists and straight laminate alternating. Pattern welding is a practice in sword and knife making by forming a blade of several metal pieces of differing composition that are forge-welded together and twisted and manipulated to form a pattern. [1]

  3. Computer programming - Wikipedia

    en.wikipedia.org/wiki/Computer_programming

    Computer programming or coding is the composition of sequences of instructions, called programs, that computers can follow to perform tasks. [ 1 ] [ 2 ] It involves designing and implementing algorithms , step-by-step specifications of procedures, by writing code in one or more programming languages .

  4. Codecademy - Wikipedia

    en.wikipedia.org/wiki/Codecademy

    Code Year was a free incentive Codecademy program intended to help people follow through on a New Year's Resolution to learn how to program, by introducing a new course for every week in 2012. [32] Over 450,000 people took courses in 2012, [33] [34] and Codecademy continued the program into 2013. Even though the course is still available, the ...

  5. Electron-beam lithography - Wikipedia

    en.wikipedia.org/wiki/Electron-beam_lithography

    where is the time to expose the object (can be divided into exposure time/step size), is the beam current, is the dose and is the area exposed. For example, assuming an exposure area of 1 cm 2 , a dose of 10 −3 coulombs /cm 2 , and a beam current of 10 −9 amperes , the resulting minimum write time would be 10 6 seconds (about 12 days).

  6. Patterning by etching at the nanoscale - Wikipedia

    en.wikipedia.org/wiki/Patterning_by_etching_at...

    Figure 1 - Example of a procedure using ammonium fluoride as an etchant and polymer brushes for visualisation. Patterning by Etching at the nanoscale (PENs) is a soft lithographic technique in which the bonds in the polydimethylsiloxane (PDMS) matrix are broken to controlably etch PDMS (i.e. dissolve) at a slow rate along the outside of a PDMS channel formed with a patterned PDMS stamp applied ...

  7. Chemical milling - Wikipedia

    en.wikipedia.org/wiki/Chemical_milling

    Chemical milling or industrial etching is the subtractive manufacturing process of using baths of temperature-regulated etching chemicals to remove material to create an object with the desired shape. [1] [2] Other names for chemical etching include photo etching, chemical etching, photo chemical etching and photochemical machining. It is ...

  8. Multiple patterning - Wikipedia

    en.wikipedia.org/wiki/Multiple_patterning

    Spacer mask: first pattern; deposition; spacer formation by etching; first pattern removal; etching with spacer mask; final pattern. In spacer patterning, a spacer is a film layer formed on the sidewall of a pre-patterned feature. A spacer is formed by deposition or reaction of the film on the previous pattern, followed by etching to remove all ...

  9. Etching (microfabrication) - Wikipedia

    en.wikipedia.org/wiki/Etching_(microfabrication)

    Etching tanks used to perform Piranha, hydrofluoric acid or RCA clean on 4-inch wafer batches at LAAS technological facility in Toulouse, France. Etching is used in microfabrication to chemically remove layers from the surface of a wafer during manufacturing. Etching is a critically important process module in fabrication, and every wafer ...