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Polyoxymethylene (POM), also known as acetal, [4] polyacetal, and polyformaldehyde, is an engineering thermoplastic used in precision parts requiring high stiffness, low friction, and excellent dimensional stability. Short-chained POM (chain length between 8 and 100 repeating units) is also better known as paraformaldehyde (PFA).
The phosphotungstate anion, an example of a polyoxometalate. In chemistry, a polyoxometalate (abbreviated POM) is a polyatomic ion, usually an anion, that consists of three or more transition metal oxyanions linked together by shared oxygen atoms to form closed 3-dimensional frameworks.
Beadwork is the art or craft of attaching beads to one another by stringing them onto a thread or thin wire with a sewing or beading needle or sewing them to cloth. [1] Beads are produced in a diverse range of materials, shapes, and sizes, and vary by the kind of art produced.
Patterns on this can be made by an electron beam (using an electron microscope), deep UV light (shorter wavelength than the standard photolithography process), or X-rays. Exposure to these creates chain scission or (de- cross-linking ) within the PMMA, allowing for the selective removal of exposed areas by a chemical developer, making it a ...
Gold filigree intricate work from Portugal Albanian silver jewellery from 19th and 20th century Sterling dish, filigree work Citrine cannetille-work brooch. Filigree (also less commonly spelled filagree, and formerly written filigrann or filigrene) [citation needed] is a form of intricate metalwork used in jewellery and other small forms of metalwork.
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Jewelry is often made in combination of both the knots and various beads (of glass, wood, and so on), pendants or shells. Sometimes 'found' focal points are used for necklaces, such as rings or gemstones , either wire-wrapped to allow for securing or captured in a net-like array of intertwining overhand knots .
Drawn thread work is one of the earliest forms of open work embroidery, and has been worked throughout Europe. Originally it was often used for ecclesiastical items and to ornament shrouds. [ 1 ] It is a form of counted-thread embroidery based on removing threads from the warp and/or the weft of a piece of even-weave fabric.