He obtained boron of

. всё более; и более; свыше

•

He obtained boron of better than 98% purity.

•

In excess of one in ten elderly people suffer with this problem at some stage.

•

The compound forms complexes with over (or more than) ten elements.

* * *

 Hence, the effective power law between confining pressure and elastic wave velocities would have an exponent greater than 1/6.

 In curve (c) we observe a reduction of more than 30 percent in the time to buckling.

— а более конкретно

— более продолжительный

— более близко к истине, когда

— более высокий..., чем дает расчёт

— более глубокое понимание

— более или менее

— более конкретно

— более одного раза

— более отчётливо видны

— более подробно этот вопрос рассмотрен в

— более подробно

— более полное представление

— более современный

— более тесное сотрудничество

— более того

— более чем вдвое

— более чем достаточно для

— в более поздний период времени

— всё более

— давать более удовлетворительные результаты

— ёмкостью не более 230 л

— ещё более осложняет

— завоёвывать всё более широкое признание

— и не более того

— и, что ещё более важно

— или более точно

— исследовать более глубоко

— не более чем

— не менее... и не более

—не отличаться более, чем на

—не отличаются одно от другого более, чем на

—обращать более пристальное внимание на

— объяснение... не более, чем догадка

— отличаться друг от друга не более, чем в... раз

— переносить дату на более поздний срок

— положение может ещё более ухудшиться

— при более близком рассмотрении

— проблема ещё более обострилась

— прошло более... лет

— становиться более понятным

— тем более, что

— что ещё более важно

— экономически более выгодный вариант по сравнению

— являться более общим случаем

. всё более; и более; свыше

•

He obtained boron of better than 98% purity.

•

In excess of one in ten elderly people suffer with this problem at some stage.

•

The compound forms complexes with over (or more than) ten elements.

•

This compound is obtained by the reaction of acetic acid and bases.

•

The best method for the preparation of chlorine monoxide is by the reaction of chlorine with mercuric oxide.

•

Boron trifluoride is most readily obtained from the reaction of boric acid, hydrogen fluoride, sulphuric acid.

SUBJECT AREA: Metallurgy

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Deville was the son of a prosperous shipowner with diplomatic duties in the Virgin Islands. With his elder brother Charles, who later became a distinguished physicist, he was sent to Paris to be educated. He took his degree in medicine in 1843, but before that he had shown an interest in chemistry, due particularly to the lectures of Thenard. Two years later, with Thenard's influence, he was appointed Professor of Chemistry at Besançon. In 1851 he was able to return to Paris as Professor at the Ecole Normale Supérieure. He remained there for the rest of his working life, greatly improving the standard of teaching, and his laboratory became one of the great research centres of Europe. His first chemical work had been in organic chemistry, but he then turned to inorganic chemistry, specifically to improve methods of producing the new and little-known metal aluminium. Essentially, the process consisted of forming sodium aluminium trichloride and reducing it with sodium to metallic aluminium. He obtained sodium in sufficient quantity by reducing sodium carbonate with carbon. In 1855 he exhibited specimens of the metal at the Paris Exhibition, and the same year Napoleon III asked to see them, with a view to using it for breastplates for the Army and for spoons and forks for State banquets. With the resulting government support, he set up a pilot plant at Jarvel to develop the process, and then set up a small company, the Société d'Aluminium at Nan terre. This raised the output of this attractive and useful metal, so it could be used more widely than for the jewellery to which it had hitherto been restricted. Large-scale applications, however, had to await the electrolytic process that began to supersede Deville's in the 1890s. Deville extended his sodium reduction method to produce silicon, boron and the light metals magnesium and titanium. His investigations into the metallurgy of platinum revolutionized the industry and led in 1872 to his being asked to make the platinum-iridium (90–10) alloy for the standard kilogram and metre. Deville later carried out important work in high-temperature chemistry. He grieved much at the death of his brother Charles in 1876, and his retirement was forced by declining health in 1880; he did not survive for long.

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