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  2. Halt and Catch Fire (computing) - Wikipedia

    en.wikipedia.org/wiki/Halt_and_Catch_Fire...

    The Motorola 6800 microprocessor was the first for which an undocumented assembly mnemonic HCF became widely known. The operation codes (opcodes—the portions of the machine language instructions that specify an operation to be performed) hexadecimal 9D and DD were reported and given the unofficial mnemonic HCF in a December 1977 article by Gerry Wheeler in BYTE magazine on undocumented ...

  3. Host cell factor C1 - Wikipedia

    en.wikipedia.org/wiki/Host_cell_factor_C1

    15161 Ensembl ENSG00000172534 ENSMUSG00000031386 UniProt P51610 Q61191 RefSeq (mRNA) NM_005334 NM_008224 RefSeq (protein) NP_005325 NP_032250 Location (UCSC) Chr X: 153.95 – 153.97 Mb Chr X: 72.99 – 73.01 Mb PubMed search Wikidata View/Edit Human View/Edit Mouse Host cell factor 1 (HCFC1, HCF1, or HCF-1), also known as VP16-accessory protein, is a protein that in humans is encoded by the ...

  4. Haplogroup CF - Wikipedia

    en.wikipedia.org/wiki/Haplogroup_CF

    Haplogroup CF, also known as CF-P143 and CT(xDE), is a human Y-chromosome DNA haplogroup.CF is defined by the SNP P143, and its existence and distribution are inferred from the fact that haplogroups descended from CF include most human male lineages in Eurasia, Oceania, and The Americas.

  5. HCF - Wikipedia

    en.wikipedia.org/wiki/HCF

    HCF may refer to: Arts and entertainment. Halt and Catch Fire; Hot Club de France, a French jazz group; Half Circle Forward, a common move in fighting game special ...

  6. Atomic packing factor - Wikipedia

    en.wikipedia.org/wiki/Atomic_packing_factor

    Indeed, three are the atoms in the middle layer (inside the prism); in addition, for the top and bottom layers (on the bases of the prism), the central atom is shared with the adjacent cell, and each of the six atoms at the vertices is shared with other six adjacent cells. So the total number of atoms in the cell is 3 + (1/2)×2 + (1/6)×6×2 = 6.

  7. Difference engine - Wikipedia

    en.wikipedia.org/wiki/Difference_engine

    The initial values of columns can be calculated by first manually calculating N consecutive values of the function and by backtracking (i.e. calculating the required differences). Col 1 0 {\displaystyle 1_{0}} gets the value of the function at the start of computation f ( 0 ) {\displaystyle f(0)} .

  8. Basis set (chemistry) - Wikipedia

    en.wikipedia.org/wiki/Basis_set_(chemistry)

    To understand how to get the number of functions, consider the cc-pVDZ basis set for H: There are two s (L = 0) orbitals and one p (L = 1) orbital that has 3 components along the z-axis (m L = −1,0,1) corresponding to p x, p y and p z. Thus, there are five spatial orbitals in total. Note that each orbital can hold two electrons of opposite spin.

  9. Cf. - Wikipedia

    en.wikipedia.org/wiki/Cf.

    Among numismatists (coin collector-research specialists), cf. may be used in references on the paper and/or online coin identification information meaning "compare to". It is common for abbreviations of listings in trusted coin catalogues or sales from certain online auctions to be cited when identifying a particular coin.