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...carbon was preserved at this time and in these swamps. After the Carboniferous, in the Permian and Triassic times, dry conditions prevailed with more desert deposits and hypersaline lakes forming as seen in the salt deposits near Carrickfergus, County Antrim. Sea levels rose again in the Jurassic period with shallow seas containing ammonites recorded in Larne. During the...

...carbon, so you're making sugars and starches. Of all the sunlight that comes into the Earth's atmosphere, about 8% is trapped by green plants through photosynthesis, and we call that gross primary productivity. Now, of that 8%, about 50% is immediately respired out, so the carbon that's been fixed then leaves the plant, the remaining 50% goes into building the plant...

...carbon and alloy steels, and Cu/Be alloys. The Shaw process can produce castings without the usual casting defects found in other processes. Benefits include: high resistance to hot tearing casting free from gas holes inclusion-free castings process permits “natural feeding” of the casting. Design: Shaw process; complex 3D components moulded in two or more parts....

...carbon steel. The resistivity of material is best if it is less than 15 x 10-6 Ω cm. Materials of poor conductivity, such as stainless steels, can be formed by using a highly conductive driver, such as aluminium sheet, or a specially built high frequency machine. Different materials can be assembled together, such as metal rings on to plastic, glass, composites and...

...carbon steel, low-alloy high strength steel, and quenched and tempered low-alloy steel. Can also be used to weld stainless steel and aluminium alloys if required. The weld metal acquires the structure of a casting, wherein the sizes and orientations of the grains are governed by heat removal characteristics. Long columnar grains can be formed with microsegregation and...

...carbon mild steel (<0.2 wt% C) which is used to produce a wide range of components, mainly in the automotive and bicycle component industries. Mild steel has to be annealed before cold forging and at interstage processes. Cold forging causes strain hardening in the materials, resulting in increases of 30–120% in tensile strength and 100–300% in yield strength values....

...carbon), 0.3–1.0 wt%; copper (infiltration), 1.5–11.0 wt%; nickel, 1.0–8.0 wt% Typical sintered properties of steels are as follows: Tensile strength (MPa) Yield strength (MPa) Elongation (%) Fe-0.5C (density 6.8 g cm-3) 296 193 3.5 Fe-2.7Cu-0.15C (density 6.8 g cm-3) 255 159 7.0 Fe-2.7Cu-0.45C (density 6.8 g cm-3) 427 310 3.0 The main additions to aluminium alloys...