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Overview

absorption layer

An amorphous zone on the dentine surface into which adhesive agents can flow. See also hybrid layer.

absorption layer

absorption layer   Quick reference

A Dictionary of Dentistry (2 ed.)

Reference type:
Subject Reference
Current Version:
2020
Subject:
Medicine and health, Dentistry
Length:
20 words

... layer n. An amorphous zone on the dentine surface into which adhesive agents can flow. See also hybrid layer...

absorption layer

absorption layer  

An amorphous zone on the dentine surface into which adhesive agents can flow. See also hybrid layer.
absorption

absorption  

The transfer of energy from a photon to an atom or molecule. If the energy of the photon is just sufficient to raise an electron from one energy level to another, the result is an absorption line at ...
Milne–Eddington approximation

Milne–Eddington approximation  

A simple model of the outer layers of a star, used in studying the formation of absorption lines in stellar spectra. It assumes that absorption occurs throughout the outer region of the star, rather ...
absorption line

absorption line  

A dark feature in the spectrum of a star, formed by cooler gas in the star's outer layers (the photosphere) that absorbs radiation emitted by hotter gas below. The Fraunhofer lines in the solar ...
Q

Q  

1 See königsberger ratio.2 The ratio of the frequency at the mid‐point of a band‐pass filter to the filter width.3 The ratio of the peak energy in a waveform to the energy lost by dissipation. As a ...
kappa mechanism

kappa mechanism  

The process that drives the pulsations of many types of variable star, including Cepheid variables and RR Lyrae stars. It is named from the Greek letter kappa (κ), the symbol for the coefficient of ...
attenuated total reflectance spectroscopy

attenuated total reflectance spectroscopy  

(ATRS)A variation of infrared spectroscopy in which the IR source is reflected from the sample and absorption occurs only in the surface layer. ATRS is used in the analysis of thin surface layers ...
helioseismology

helioseismology  

The study of the Sun's interior by observing the oscillations of its surface. Solar oscillations occur on both a global and a local scale. Local oscillations are apparent through small Doppler shifts ...
global Ozone Monitoring Experiment

global Ozone Monitoring Experiment  

(GOME)An instrument carried by the European satellite ERS-2 for mapping the global ozone layer. Its two-dimensional mapping function was extended to three dimensions by the more sophisticated ...
sudden ionospheric disturbance

sudden ionospheric disturbance  

(SID)An abrupt increase in the absorption of radio waves in the D-region of the ionosphere. This arises from additional ionization caused by the intense X-ray radiation emitted by solar flares.
Kramers opacity

Kramers opacity  

A formula for the opacity in a star's interior. It is valid at temperatures around 104–106 K when the opacity is mostly due to absorption of photons by free electrons in the interior, and it declines ...
diffuse reflection

diffuse reflection  

Reflection due to light being absorbed by a thin layer under the surface of an object then reradiated. The radiated light is distributed uniformly from the point of incidence on the same side of the ...
Sir Alfred Brian Pippard

Sir Alfred Brian Pippard  

Reference type:
Overview Page
(1920–2008) British physicistPippard, the son of a professor of engineering, was born at Leeds and educated at Cambridge University. After wartime research on the development of radar, he obtained ...
root hair

root hair  

An outgrowth (trichome) from a single epidermal cell in the piliferous layer of a root. It is thin-walled and increases the total surface area available for the absorption of water and nutrients.
beryllium

beryllium  

Symbol Be. A grey metallic element of group 2 (formerly IIA) of the periodic table; a.n. 4; r.a.m. 9.012; r.d. 1.85; m.p. 1278°C; b.p. 2970°C. Beryllium occurs as beryl (3BeO.Al2O3.6SiO2) and ...
Neptune

Neptune  

The eighth planet from the Sun. It appears distinctly blue, due to absorption of red light by methane in its atmosphere. Its mean opposition magnitude is +7.8, too faint to be seen with the naked ...
supernova

supernova  

A violent explosion in which certain stars end their lives; given the variable-star type designation SN. In a supernova explosion, the star may become over a billion times brighter than the Sun, and ...
ozone

ozone  

Triatomic oxygen, a very reactive, irritant gas, mainly formed in the atmosphere by various photochemical reactions. Its concentration is measured in Dobson units. It is found primarily at three ...
monochromatic absorption coefficient

monochromatic absorption coefficient   Quick reference

A Dictionary of Mechanical Engineering (2 ed.)

Reference type:
Subject Reference
Current Version:
2019

...monochromatic absorption coefficient ( α ‎ λ ‎ ) A measure of the decrease in thermal-radiation intensity at a given wavelength λ ‎ due to absorption by a gas. According to Beer’s law , I λ x = I λ 0 exp ( − α λ x ) where I λ x is the intensity after absorption by a gas layer of thickness x and I λ 0 is the initial...

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