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  2. Face masks during the COVID-19 pandemic - Wikipedia

    en.wikipedia.org/wiki/Face_masks_during_the...

    During the COVID-19 pandemic, face masks or coverings, including N95, FFP2, surgical, and cloth masks, have been employed as public and personal health control measures against the spread of SARS-CoV-2, the virus that causes COVID-19. In community and healthcare settings, the use of face masks is intended as source control to limit transmission ...

  3. Cloth face mask - Wikipedia

    en.wikipedia.org/wiki/Cloth_face_mask

    A cloth face mask is a mask made of common textiles, usually cotton, worn over the mouth and nose.When more effective masks are not available, and when physical distancing is impossible, cloth face masks are recommended by public health agencies for disease "source control" in epidemic situations to protect others from virus laden droplets in infected mask wearers' breath, coughs, and sneezes.

  4. Photomask - Wikipedia

    en.wikipedia.org/wiki/Photomask

    A schematic illustration of a photomask (top) and an IC layer printed using it (bottom) A photomask (also simply called a mask) is an opaque plate with transparent areas that allow light to shine through in a defined pattern. Photomasks are commonly used in photolithography for the production of integrated circuits (ICs or "chips") to produce a ...

  5. Maskless lithography - Wikipedia

    en.wikipedia.org/wiki/Maskless_lithography

    Maskless lithography has two approaches to project a pattern: rasterized and vectorized. In the first one it utilizes generation of a time-variant intermittent image on an electronically modifiable (virtual) mask that is projected with known means (also known as laser direct imaging and other synonyms). In the vectored approach, direct writing ...

  6. Bahtinov mask - Wikipedia

    en.wikipedia.org/wiki/Bahtinov_mask

    The Bahtinov mask is a device used to focus small astronomical telescopes accurately. Although masks have long been used as focusing aids, the distinctive pattern was invented by Russian amateur astrophotographer Pavel Bahtinov (Russian: Павел Бахтинов) in 2005. [1][2] Precise focusing of telescopes and astrographs is critical to ...

  7. Spacer patterning - Wikipedia

    en.wikipedia.org/wiki/Spacer_patterning

    Spacer patterning is a technique employed for patterning features with linewidths smaller than can be achieved by conventional lithography. In the most general sense, the spacer is a layer that is deposited over a pre-patterned feature, often called the mandrel. The spacer is subsequently etched back so that the spacer portion covering the ...

  8. Alaska Native art - Wikipedia

    en.wikipedia.org/wiki/Alaska_Native_art

    No part of an animal hunted, fished or trapped could be wasted, for example, so one might see boots or "mukluks" made of bearded seal skin for soles, salmon skin for the outer layer, and straps of caribou or deerskin, perhaps even dyed with berries. As Native people lived off the land and the sea, their relationships to a particular place could ...

  9. Nonwoven fabric - Wikipedia

    en.wikipedia.org/wiki/Nonwoven_fabric

    Nonwoven fabric. Nonwoven fabric or non-woven fabric is a fabric -like material made from staple fibre (short) and long fibres (continuous long), bonded together by chemical, mechanical, heat or solvent treatment. The term is used in the textile manufacturing industry to denote fabrics, such as felt, which are neither woven nor knitted. [1]

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