By Matthew Lyon, Katie Hafner
Twenty 5 years in the past, it didn't exist. this day, twenty million humans world wide are browsing the web. Where Wizards stay awake Late is the interesting tale of the pioneers liable for developing the main mentioned, such a lot influential, and so much far-reaching communications leap forward because the invention of the telephone.
In the 1960's, while desktops the place considered as mere tremendous calculators, J.C.R. Licklider at MIT observed them because the final communications units. With protection division money, he and a band of visionary computing device whizzes all started paintings on a national, interlocking community of desktops. Taking readers behind the curtain, Where Wizards stay awake Late captures the labor, genius, and chuffed injuries in their bold, stunningly winning enterprise.
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Additional info for Where Wizards Stay Up Late: The Origins of the Internet
Surface Resistivity: Values obtained for this property depend on electrode configuration, pressure on the electrodes, roughness of the surface being measured, applied voltage, and other factors, so that methods of measurement are a deep subject (Ref. 4-19). However, for our purposes, an approximate, easily made determination by a Voyager SRM-II 0 meter or equivalent is sufficient. The critical property is bleed-off time for static charges and, since we don't have an exact criterion for bleed-off time, which is arbitrary, we don't need precise values for the property, surface resistivity, that controls bleed-off time.
Grounding also means the electrical connection of conductive, static-dissipative, or antistatic materials with earth in any manner. HBM: Human Body Model, a damage mechanism (special case of DI). , to 30% or 40% minimum at 70°F, to reduce the triboelectric charging of materials in the SSW. Insulator: A nonconductor. Ionization: The ionization of air for the purpose of neutralizing charged surfaces. Latent Failure: Failure of an ESDS device because of previous degradation and weakening by one or more ESD events.
Capacitance: The capacity or ability of an object to hold a charge. In ESD control, the usual unit of capacitance is the picofarad, pF. CDM: Charged Device Model, a damage mechanism. CD Rule: Charge-distance rule. An empirical relation of safe distance from a surface versus the apparent charge on that surface. This rule protects items sensitive to 100 V from damage by E fields by the FIM. Conductive: Having a surface resistivity of less than lOS ohms/square. Conductor: A conductive material. Common examples in ESD control are metals and plastics loaded with graphitic ("metallic") carbon.