Learn More
The HipHop Virtual Machine (HHVM) is a JIT compiler and runtime for PHP. While PHP values are dynamically typed, real programs often have <i>latent</i> types that are useful for optimization once discovered. Some types can be proven through static analysis, but limitations in the ahead-of-time approach leave some types to be discovered at run time. And even(More)
Applicabilities of several azoimidazoles as metallochromic indicators were investigated in the light of the general equations expressing the colour change of the visual chelatometric titrations. By using the stability constants of the nickel(II), copper(II), zinc(II) and cadmium(II) chelates, the useful pH ranges, titration errors and sharpness of colour(More)
Chelating abilities of several azoimidazoles containing a hydroxy and/or a dimethylanuno group, and the structures of their copper chelates, were investigated. 1-(5-Methyl-4-imidazolylazo)-2-naphthol(IAN) formed a brown-black chelate having the composition Cu(ligand)Br whereas 4-(5-methyl-4-imidazolylazo)dimethylaminobenzene (DAI) formed a reddish brown(More)
  • 1