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The Federal Taxpayer Registry (Spanish: Registro Federal de Contribuyentes, RFC), also known as RFC number, is a tax identification number required by any physical or natural person or moral or juridical person (legal entity) in Mexico to carry out any lawful economic activity for which they are obliged to pay taxes, with some exceptions.
A calcium–aluminium-rich inclusion or Ca–Al-rich inclusion (CAI) is a submillimeter- to centimeter-sized light-colored calcium- and aluminium-rich inclusion found in carbonaceous chondrite meteorites. The four CAIs that have been dated using the Pb-Pb chronometer yield a weighted mean age of 4567.30 ± 0.16 Myr.
The following inclusion types can also be found in aluminium alloys: alumina needles (Al 2 O 3), nitrides (AlN), iron oxides (FeO), manganese oxides (MnO), fluorides (Na 3 AlF 6, NaF, CaF 2, …), aluminium borides (AlB 2, AlB 12), borocarbides (Al 4 C 4 B). Bone ash (Ca 3 (PO 4) 2) sometimes added to patch cracks in the trough can be found as ...
Al-Ca composite is a high-conductivity, high-strength, lightweight composite consisting of sub-micron-diameter pure calcium metal filaments embedded inside a pure aluminium metal matrix. The material is still in the development phase, but it has potential use as an overhead high-voltage power transmission conductor . [ 1 ]
This was progressively improved by the PKIX Working Group, [6] and approved by the IESG as RFC 6844, a Proposed Standard, in January 2013. [7] CA/Browser Forum discussion began shortly afterward, [4] and in March 2017 they voted in favor of making CAA implementation mandatory for all certificate authorities by September 2017.
It is proposed in RFC 6698 as a way to authenticate TLS client and server entities without a certificate authority . It is updated with operational and deployment guidance in RFC 7671. Application specific usage of DANE is defined in RFC 7672 for SMTP and RFC 7673 for using DANE with Service (SRV) records.
RFC 7804, Salted Challenge Response HTTP Authentication Mechanism; RFC 8600, Using Extensible Messaging and Presence Protocol (XMPP) for Security Information Exchange; RFC 8621, The JSON Meta Application Protocol (JMAP) for Mail; RFC 9051, Internet Message Access Protocol (IMAP) - Version 4rev2; RFC 9266, Channel Bindings for TLS 1.3
CRL for a revoked cert of Verisign CA. There are two different states of revocation defined in RFC 5280: Revoked A certificate is irreversibly revoked if, for example, it is discovered that the certificate authority (CA) had improperly issued a certificate, or if a private-key is thought to have been compromised.