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  2. Grey relational analysis - Wikipedia

    en.wikipedia.org/wiki/Grey_relational_analysis

    Grey relational analysis. Grey relational analysis ( GRA) was developed by Deng Julong of Huazhong University of Science and Technology. It is one of the most widely used models of grey system theory. GRA uses a specific concept of information. It defines situations with no information as black, and those with perfect information as white.

  3. Secure Electronic Transaction - Wikipedia

    en.wikipedia.org/wiki/Secure_Electronic_Transaction

    Secure Electronic Transaction (SET) is a communications protocol standard for securing credit card transactions over networks, specifically, the Internet. SET was not itself a payment system , but rather a set of security protocols and formats that enabled users to employ the existing credit card payment infrastructure on an open network in a ...

  4. Foam - Wikipedia

    en.wikipedia.org/wiki/Foam

    Foam, in this case meaning "bubbly liquid", is also produced as an often-unwanted by-product in the manufacture of various substances. For example, foam is a serious problem in the chemical industry, especially for biochemical processes. Many biological substances, for example proteins, easily create foam on agitation or aeration.

  5. Spray foam - Wikipedia

    en.wikipedia.org/wiki/Spray_foam

    Spray foam insulation or spray polyurethane foam (SPF) is an alternative to traditional building insulation such as fiberglass. A two-component mixture composed of isocyanate and polyol resin comes together at the tip of a gun, and forms an expanding foam that is sprayed onto roof tiles, concrete slabs, into wall cavities, or through holes ...

  6. Metal foam - Wikipedia

    en.wikipedia.org/wiki/Metal_foam

    Regular foamed aluminium. In materials science, a metal foam is a material or structure consisting of a solid metal (frequently aluminium) with gas-filled pores comprising a large portion of the volume. The pores can be sealed (closed-cell foam) or interconnected (open-cell foam). [1]

  7. Secure element - Wikipedia

    en.wikipedia.org/wiki/Secure_Element

    A secure element (SE) is a secure operating system (OS) in a tamper-resistant processor chip or secure component. It can protect assets (root of trust, sensitive data, keys, certificates, applications) against high-level software and hardware attacks. Applications that process this sensitive data on an SE are isolated and so operate within a ...

  8. Polyurethane foam - Wikipedia

    en.wikipedia.org/wiki/Polyurethane_foam

    Flexible polyurethane foam. The so-called flexible polyurethane foam (FPF) is produced from the reaction of polyols and isocyanates, a process pioneered in 1937. [1] FPF allows for some compression and resilience that provides a cushioning effect. Because of this property, it is often used in furniture, bedding, automotive seating, athletic ...

  9. Ghana Revenue Authority - Wikipedia

    en.wikipedia.org/wiki/Ghana_Revenue_Authority

    Website. www .gra .gov .gh. The Ghana Revenue Authority (GRA) is the Ghana administration charged with the task of assessing, collecting and accounting for tax revenue in Ghana. [1] [2] As part of efforts to improve compliance, the Authority is required to assist taxpayers to understand and meet their tax obligations by providing robust and ...

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