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picoplankton

picoplankton  

Marine planktonic organisms, 0.2–2.0 μm in size, and consisting mainly of bacteria and cyanobacteria.
limonite

limonite  

Mineral, FeO(OH).nH2O; sp. gr. 2.7–4.3; hardness 4.0–5.3; yellowish-brown to reddish-brown; normally earthy lustre; usually amorphous; occurs as a secondary mineral from the weathering of iron in ...
transit time

transit time  

The time taken for a seismic P-wave to travel through one foot (0.3048 m), measured by a sonic log in units of μs/foot.
Laplace equation

Laplace equation  

The partial differential equation:∂2u/∂x2 + ∂2u/∂y2 + ∂2u/∂z2 = 0It may also be written in the form ∇2u = 0, where ∇2 is called the Laplace operator. It was formulated by the French mathematician P. ...
P700

P700  

The pigment that acts as the energy trap of photosystem I in chloroplasts. It is thought to be chlorophyll a in a special structural environment. It represents about 0.3 per cent of the total ...
Charles' law

Charles' law  

The volume of a fixed mass of gas at constant pressure expands by a constant fraction of its volume at 0°C for each Celsius degree or kelvin its temperature is raised. For any ideal gas the fraction ...
synaptic cleft

synaptic cleft  

The narrow gap, typically 0.02 micrometres wide, between a presynaptic neuron and a postsynaptic neuron, muscle, or gland at a synapse (1).
electronegative

electronegative  

Describing elements that tend to gain electrons and form negative ions. The halogens are typical electronegative elements. For example, in hydrogen chloride, the chlorine atom is more electronegative ...
power

power  

1. (in physics) Symbol P. The rate at which work is done or energy is transferred. In SI units it is measured in watts (joules per second). See also horsepower.2. (in mathematics) The number of times ...
mole

mole  

Symbol mol. The SI unit of amount of substance. It is equal to the amount of substance that contains as many elementary units as there are atoms in 0.012 kg of carbon–12. The elementary units may be ...
noble gases

noble gases  

A group of monatomic gaseous elements forming group 18 (formerly group 0) of the periodic table: helium (He), neon (Ne), argon (Ar), krypton (Kr), xenon (Xe), and radon (Rn). The electron ...
metastable state

metastable state  

A condition of a system in which it has a precarious stability that can easily be disturbed. It is unlike a state of stable equilibrium in that a minor disturbance will cause a system in a metastable ...
free energy

free energy  

A measure of a system's ability to do work. The Gibbs free energy (or Gibbs function), G, is defined by G = H – TS, where G is the energy liberated or absorbed in a reversible process at constant ...
Fourier analysis

Fourier analysis   Quick reference

A Dictionary of Chemistry (8 ed.)

Reference type:
Subject Reference
Current Version:
2020
Subject:
Science and technology, Chemistry
Length:
204 words
Illustration(s):
2

...f ( x ) = a 0 / 2 + ∑ n = 1 ∞ ( a n cos n x + b n sin n x ) A series of this type is called a Fourier series . If the function is periodic with a period 2 π ‎, the coefficients a 0 , a n , b n are: a 0 = ∫ - π + π f ( x ) d x , a n = ∫ - π + π f ( x ) cos n x d x , ( n = 1 , 2 , 3 , … ) , b n = ∫ - π + π 1 / π f ( x ) sin n x d x , ( n = 1 , 2 , 3 , .… ) . Fourier analysis and Fourier series are named after the French mathematician and engineer Joseph Fourier ( 1768–1830 ). Fourier series have many important applications in mathematics, science, and...

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