yankee group report, globally operators experience profit leakage in excess of $ billion each year.[ citation needed ] the access network is also perhaps the most valuable asset an operator owns, since this is what physically allows them to offer a service. access networks consist largely of pairs of copper...
oxidation can produce a uniform oxide coating termed a passivation layer. once this coating has formed, it prevents further reaction of the underlying metal. oxide passivation layers form spontaneously on some types of pure metals, such as aluminum or titanium , as well as on many corrosion-resistant alloys...
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