The alkaline earth metals are six chemical elements in group 2 of the periodic table. They are beryllium (Be), magnesium (Mg), calcium (Ca), strontium (Sr), barium (Ba), and radium (Ra). [1 ] The elements have very similar properties: they…
Sebevražda je často páchána ze zoufalství, jehož příčina je obvykle přičítána duševní poruše, například depresi, bipolární poruše, schizofrenii, alkoholismu nebo narkomanii. [1 ] Svou roli nezřídka hrají i stresové faktory, jako například…
Squares are special cases of rectangles, which have four equal angles, and of rhombuses, which have four equal sides. As with all rectangles, a square's angles are right angles (90 degrees, or π/2 radians), making adjacent sides…
The aim of this study was to compare the impact of different freshwater inflow volumes on benthic communities and water column dynamics in different estuary classes. Benthic and water column spatial dynamics were contrasted in lagoons (with…
Polyethylene terephthalate (or poly(ethylene terephthalate), [5 ] PET, PETE, or the obsolete PETP or PET-P), is the most common thermoplastic polymer resin of the polyester family and is used in fibres for clothing, containers for liquids…
Historiquement, les marchés des aromatiques sont en général très volatils et caractérisés par un surplus de production. Les prix bas du benzène sur la période 1993-2002 ont incité certains producteurs à se désengager.