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Form 20-F

In the USA, the form required by the Securities and Exchange Commission for the filing of annual results by non-US companies.

oscillator

oscillator  

An electronic device that produces an alternating output of known frequency. If the output voltage or current has the form of a sine wave with respect to time, the device is called a sinusoidal (or ...
Leclanché cell

Leclanché cell   Quick reference

A Dictionary of Physics (8 ed.)

Reference type:
Subject Reference
Current Version:
2019
Subject:
Science and technology, Physics
Length:
103 words

... voltaic cell consisting of a carbon rod (the anode) and a zinc rod (the cathode) dipping into an electrolyte of a 10–20% solution of ammonium chloride. Polarization is prevented by using a mixture of manganese dioxide mixed with crushed carbon, held in contact with the anode by means of a porous bag or pot; this reacts with the hydrogen produced. This wet form of the cell, devised in 1867 by Georges Leclanché ( 1839–82 ), has an e.m.f. of about 1.5 volts. The dry cell based on it is widely used in torches, radios, and...

quantum mechanics

quantum mechanics   Quick reference

A Dictionary of Physics (8 ed.)

Reference type:
Subject Reference
Current Version:
2019
Subject:
Science and technology, Physics
Length:
1,612 words
Illustration(s):
3

...is regarded as being imparted to matter in discrete packets rather than continuously, as one might expect from a wave. Einstein assumed that in the photoelectric effect, light behaves as a shower of particles, each with energy E given by Planck’s expression: E = h f , where f is the light’s frequency and h is the Planck constant . Each particle of light, which Einstein called a photon , would impart its energy to a single electron in the metal. The electron would be liberated only if the photon could impart at least the required amount of...

windchill (factor)

windchill (factor)   Quick reference

A Dictionary of Weights, Measures, and Units

Reference type:
Subject Reference
Current Version:
2004

...speed, constructed to reflect the greater freezing effect, particularly on hairless human skin and flesh, of low temperatures when accompanied by significant wind. The initial form consisted merely of subtracting the Fahrenheit temperature from the wind speed measured in miles per hour, e.g. a wind of 20 m.p.h. and a temperature of -30°F gave a windchill of 50, equatable with -50°F in calm conditions. The real effect is far from linearly additive in such a simple (and convenient) manner. Careful study has produced more complex formulations, convertible to a...

temperature

temperature   Quick reference

A Dictionary of Weights, Measures, and Units

Reference type:
Subject Reference
Current Version:
2004

...419.67∼ -32 -20 253.15 -4 455.67∼ -16 -17.78∼ 255.37∼ 0 459.67∼ -14.22∼ 0 273.15 32 491.67∼ 0 20 293.15 68 527.67∼ 16 40 313.15 104 563.67∼ 32 60 333.15 140 599.67∼ 48 80 353.15 176 635.67∼ 64 100 373.15 212 671.67∼ 80 Relevant conversion formulae between the Celsius, kelvin, Fahrenheit, and Rankine scales, represented respectively by c , k , f , and r , are: c = k - 273.15 c = ( f - 32)5/9 c = ( r - 491.67) 5/9 k = c + 273.15 k = ( f - 32)5/9 + 273.15 k = ( r - 491.67)5/9 + 273.15 f = 9 c /5 + 32 f = 9( k - 273.15)/5 + 32 f = r -...

horse

horse   Quick reference

A Dictionary of Weights, Measures, and Units

Reference type:
Subject Reference
Current Version:
2004
Subject:
Science and technology, Mathematics and Computer Science, Physics
Length:
244 words
Illustration(s):
1

...in the UK up to 1947 was of the order of 8 to 20; this was a notional calculation, proportional to the aggregate cross-sectional area of the cylinders, i.e. = 0.4 × D 2 ⋅ N where D is the cylinder diameter in inches and N the number of cylinders. If P is the maximal pressure on the pistons in pounds per square inch and S is the stroke length in inches, then Besides the original unit, there is the rounded metric horse power = 75 kg-f⋅m⋅s -1 (0.986 320∼ hp, 0.735 499∼ kWand several context-specific forms, namely: electric horse power =0.746 kW, water...

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