Practical measure of molecular mass of polyvinyl chloride, obtained from intrinsic viscosity experi
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US designation of microwave band between 12 and 40 GHz, widely adopted in the absence of internationally agreed standards. Subdivided into Ku-band K-under, 12-19 GHz, K-band, 18-26 GHz and Ka K- above, 26-40 GHz; replacing approximately the UK designations of J-, K- and Q-bands.
Absorption of an electron from the innermost K shell of an atom into its nucleus. An alternative to ejection of a positron from the nucleus of a radioisotope. Also K-electron capture. See X-ray.
A cell generally resembling a lymphocyte which bears Fc receptors by which it can bind to other cells to which are attached antibodies against antigens on the cell surface thus exposing the Fc portions. K-cells induce lesions in the membrane of the target cell which kill it. This is an example of antibody-dependent cell-mediated cytotoxicity.
A form of A-display produced with a lobe- switching antenna. Each lobe produces its own peak and the antenna is direcdy on target when both parts of the resulting double peak have the same height. See R-display.
Characteristic X-ray frequencies from atoms due to excitation of electrons in the K-shell. Denoted by Ka, K/?, Ky; the lines are all doublets,
The innermost electron shell in an atom corresponding to a principal quantum number of unity. The shell can contain two electrons. See panel on Atomic structure.
Symbol for momentum space or wavevector space. This is an important concept in semiconductor energy band theory. See Brillouin zone.
Organism which assigns relatively little of its resources to reproduction; characteristic of stable, satur
A hydrated silicate of calcium, sodium, magnesium, iron, titanium and aluminium; a member of the amphibole group crystallizing in the monoclinic sys