resistivity
71Distributed element model — Fig.1 Transmission line. The distributed element model applied to a transmission line. This article is an example from the domain of electrical systems, which is a special case of the more general distributed parameter systems. In electrical… …
72Superconductivity — is a phenomenon occurring in certain materials generally at very low temperatures, characterized by exactly zero electrical resistance and the exclusion of the interior magnetic field (the Meissner effect).The electrical resistivity of a metallic …
73Ytterbium — Yb redirects here. For the unit of information, see Yottabit. thulium ← ytterbium → lutetium ↑ Yb ↓ No …
74Langmuir probe — A Langmuir probe is a device named after Nobel Prize winning physicist Irving Langmuir, used to determine the electron temperature, electron density, and electric potential of a plasma. It works by inserting one or more electrodes into a plasma,… …
75Phase-change memory — Computer memory types Volatile RAM DRAM (e.g., DDR SDRAM) SRAM In development T RAM Z RAM TTRAM Historical Delay line memory Selectron tube Williams tube Non volatile …
76Constitutive equation — Many defining equations are in the form of a constitutive equation, since parameters of a property or effect associated matter are characteristic to the substance in question. A large number of other defining equations not specifically… …
77Constantan — is a copper nickel alloy usually consisting of 55% copper and 45% nickel.[1] Also known as Eureka. Its main feature is its resistivity which is constant over a wide range of temperatures. Other alloys with similarly low temperature coefficients… …
78Skin depth — is a measure of the distance an alternating current can penetrate beneath the surface of a conductor.When an electromagnetic wave interacts with a conductive material, mobile charges within the material are made to oscillate back and forth with… …
79Characterisation of pore space in soil — Soil is essential to most animals on the earth. It is a relatively thin crust where an even smaller portion contains much of the biological activity. Soil consists of three different phases. A solid phase (≈ 20%) that contains mainly minerals of… …
80List of oil field acronyms — Contents 1 # 2 A 3 B 4 C …
