second stage, the amount of carbon in the pig iron is lowered by oxidation to yield wrought iron, steel, or cast iron. [ ] other metals can be added at this stage to form alloy steels . th century chinese illustration of workers at a blast furnace, making wrought iron from pig iron [ ] how iron was extracted...
chick chow. they noticed that chicks fed only fat-depleted chow developed hemorrhages and started bleeding from tag sites. [ ] dam found that these defects could not be restored by adding purified cholesterol to the diet. it appeared that – together with the cholesterol – a second compound had been extracted...
organic compounds" or volatile or semi-volatile organic compounds (vocs and svocs). these are typically compounds containing carbon, hydrogen, and sometimes oxygen. many non-halogenated vocs and svocs are present in natural gas as well, originating from the geological basin from which the gas was extracted...
volume sales trends – ); world bank, world development indicators – gd ( ) the current clothing system is extremely wasteful and polluting the current system for producing, distributing, and using clothing operates in an almost completely linear way. large amounts of non- renewable resources are extracted...
volume sales trends – ); world bank, world development indicators – gd ( ) the current clothing system is extremely wasteful and polluting the current system for producing, distributing, and using clothing operates in an almost completely linear way. large amounts of non- renewable resources are extracted...
being conveyed to a surface stockpile via a declined conveyor system. ore is withdrawn from the surface stockpile and undergoes two stages of crushing, dry screening and wet screening to yield lumpy and fine products. at the plant, the finer fractions are stockpiled while the coarser fractions are extracted...
network henkel has developed sophisticated filtration for this purpose, which breaks down the used cleaning solutions into their individual components so that the active agents can be reused. this means that only the dirt in these solutions needs to be disposed of. in certain processes, dirt can be extracted...
liquids – ethane, lpg and naphtha separated from the production of natural gas). excludes liquid fuels from other sources such as biofuels and synthetic derivatives of coal and natural gas. this also excludes liquid fuel adjustment factors such as refinery processing gain. excludes oil shales/kerogen extracted...
served separately, such as a standalone rdf/xml document along with an html document. the metadata can also be embedded in html, using technologies such as rdfa [ rdfa primer ], microformats and other documents to which the grddl [ grddl ] mechanisms can be applied. in those cases the rdf data is extracted...