Because the clocks had been on average well above sea level, this meant that TAI slowed down, by about 10 < sup >− 12 </ sup >.

Algeria has always been a source of inspiration for different painters who tried to immortalize the prodigious diversity of the sites it offers and the profusion of the facets that passes its population, which offers for Orientalists between the 19 < sup > th </ sup > century and the 20 < sup > th </ sup > century, a striking inspiration for a very rich artistic creation like Eugène Delacroix with his famous painting women of Algiers in their apartment or Etienne Dinet or other painters of world fame like Pablo Picasso with his painting women of Algiers, or painters issued from the Algiers school.

* If it is required to use a single number X as an estimate for the value of numbers, then the arithmetic mean does this best, in the sense of minimizing the sum of squares ( x < sub > i </ sub > − X )< sup > 2 </ sup > of the residuals.

η < sup > 2 </ sup > ( eta-squared ):

He also offers a conversion table ( see Cohen, 1988, p. 283 ) for eta squared ( η < sup > 2 </ sup >) where 0. 0099 constitutes a small effect, 0. 0588 a medium effect and 0. 1379 a large effect.

When there are only two means to compare, the t-test and the ANOVA F-test are equivalent ; the relation between ANOVA and t is given by F = t < sup > 2 </ sup >.

The Arrhenius definition states that acids are substances which increase the concentration of hydronium ions ( H < sub > 3 </ sub > O < sup >+</ sup >) in solution.

The reason why pHs of acids are less than 7 is that the concentration of hydronium ions is greater than 10 < sup >− 7 </ sup > moles per liter.

An Arrhenius acid is a substance that increases the concentration of the hydronium ion, H < sub > 3 </ sub > O < sup >+</ sup >, when dissolved in water.

The International Time Bureau ( BIH ) began a time scale, T < sub > m </ sub > or AM, in July 1955, using both local caesium clocks and comparisons to distant clocks using the phase of VLF radio signals.

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All 128 ASCII characters, including non-printable characters ( represented by their abbreviations ). The 95 ASCII graphic characters are numbered from 20 < sub > hexadecimal | hex </ sub > to 7E < sub > hexadecimal | hex </ sub > ( decimal 32 to 126 ).

The " space " character had to come before graphics to make sorting easier, so it became position 20 < sub > hex </ sub >; for the same reason, many special signs commonly used as separators were placed before digits.

To keep options available for lower case letters and other graphics, the special and numeric codes were arranged before the letters, and the letter " A " was placed in position 41 < sub > hex </ sub > to match the draft of the corresponding British standard.

The @ symbol was not used in continental Europe and the committee expected it would be replaced by an accented À in the French variation, so the @ was placed in position 40 < sub > hex </ sub > next to the letter A.

The simplest possible alkane ( the parent molecule ) is methane, CH < sub > 4 </ sub >.

Hydrogen chloride ( HCl ) and ammonia combine under several different conditions to form ammonium chloride, NH < sub > 4 </ sub > Cl.

# H < sub > 3 </ sub > O < sup >+</ sup >( aq ) + Cl < sup >−</ sup >( aq ) + NH < sub > 3 </ sub > → Cl < sup >−</ sup >( aq ) + NH < sub > 4 </ sub >< sup >+</ sup >( aq )

# HCl ( benzene ) + NH < sub > 3 </ sub >( benzene ) → NH < sub > 4 </ sub > Cl ( s )

# HCl ( g ) + NH < sub > 3 </ sub >( g ) → NH < sub > 4 </ sub > Cl ( s )

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Only a limited number of actinium compounds are known including AcF < sub > 3 </ sub >, AcCl < sub > 3 </ sub >, AcBr < sub > 3 </ sub >, AcOF, AcOCl, AcOBr, Ac < sub > 2 </ sub > S < sub > 3 </ sub >, Ac < sub > 2 </ sub > O < sub > 3 </ sub > and AcPO < sub > 4 </ sub >.

Except for AcPO < sub > 4 </ sub >, they are all similar to the corresponding lanthanum compounds and contain actinium in the oxidation state + 3.

Next consider the sample ( 10 < sup > 8 </ sup > + 4, 10 < sup > 8 </ sup > + 7, 10 < sup > 8 </ sup > + 13, 10 < sup > 8 </ sup > + 16 ), which gives rise to the same estimated variance as the first sample.

If F ≥ F < sub > Critical </ sub > ( Numerator DF, Denominator DF, α )

With the formula C < sub > n </ sub > H < sub > 2n + 2 </ sub >, Alkanes belong to a homologous series of organic compounds in which the members differ by a constant relative molecular mass of 14.

The number of carbon atoms is used to define the size of the alkane ( e. g., C < sub > 2 </ sub >- alkane ).

At present, techniques to establish the realization of an ampere have a relative uncertainty of approximately a few parts in 10 < sup > 7 </ sup >, and involve realizations of the watt, the ohm and the volt.

APCs then present the fragments to T helper cells ( CD4 < sup >+</ sup >) by the use of class II histocompatibility molecules on their surface.

When clouds are present, the loss rate of SO < sub > 2 </ sub > is faster than can be explained by gas phase chemistry alone.

In 2010, A team from New York described detection of PrP < sup > Sc </ sup > even when initially present at only one part in one hundred billion ( 10 < sup >− 11 </ sup >) in brain tissue.

It turns cloudy where CO < sub > 2 </ sub > is present.

Oceans are at present CO < sub > 2 </ sub > sinks, and represent the largest active carbon sink on Earth, absorbing more than a quarter of the carbon dioxide that humans put into the air.

At the present time, approximately one third < ref > of human generated emissions are estimated to be entering the ocean.

Heavy metals ( Tl, Cd, Hg, ...) are often found as trace elements in common metal sulfides ( pyrite ( FeS < sub > 2 </ sub >), zinc blende ( ZnS ), galena ( PbS ), ...) present as secondary minerals in most of the raw materials.

For many cytochromes, the metal ion present is that of iron, which interconverts between Fe < sup > 2 +</ sup > ( reduced ) and Fe < sup > 3 +</ sup > ( oxidised ) states ( electron-transfer processes ) or between Fe < sup > 2 +</ sup > ( reduced ) and Fe < sup > 3 +</ sup > ( formal, oxidised ) states ( oxidative processes ).

The form of the light diffracted by a grating depends on the structure of the elements and the number of elements present, but all gratings have intensity maxima at angles θ < sub > m </ sub > which are given by the grating equation

* Bertrand Meyer: < cite > Standard Eiffel </ cite > ( revision of preceding entry ), ongoing, 1997 – present, at < cite > Bertrand Meyer's ETL3 page </ cite >, and

where is the highest frequency component present in the modulating signal x < sub > m </ sub >( t ), and is the peak frequency-deviation — i. e. the maximum deviation of the instantaneous frequency from the carrier frequency.

The Holocene is a geological epoch which began at the end of the Pleistocene ( around 12, 000 < sup > 14 </ sup > C years ago ) and continues to the present.

* Hemoglobin H ( β < sub > 4 </ sub >)-A variant form of hemoglobin, formed by a tetramer of β chains, which may be present in variants of α thalassemia.

* Hemoglobin Barts ( γ < sub > 4 </ sub >)-A variant form of hemoglobin, formed by a tetramer of γ chains, which may be present in variants of α thalassemia.

However, 2 + ions ( Be < sup > 2 +</ sup >) or even 1 + ( Li < sup >+</ sup >) show some polarizing power because their sizes are so small ( e. g., LiI is ionic but has some covalent bonding present ).

As O < sub > 2 </ sub >- rich surface waters seep into deep anoxic karst systems it brings oxygen which reacts with sulfide present in the system ( pyrite or H < sub > 2 </ sub > S ) to form sulfuric acid ( H < sub > 2 </ sub > SO < sub > 4 </ sub >).