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Some algae species are 50% or more lipid oil by weight. This oil may be pressed from the algae and refined into diesel. The process for extracting algal oil, at its simplest level, resembles pressing an olive. Up to 75% from the oil might be squeezed from algae using a simple mechanical press. Hexane might be used being a solvent to raise extraction up to 95%. Once extracted, the oil is refined through transesterification. A catalyst including sodium hydroxide is combined with alcohol to make biodiesel and glycerol.
A tyre is a circular, circular elastic rubber product that is rolled on various vehicles or mechanically. Usually mounted on a metal rim, it can support the body, cushion the impact, realize the contact with the road and guarantee the driving performance of the vehicle. Tyres are often used under the condition of complex and demanding, it when driving under various deformation, load, force and the function of the high and low temperature, so you must have high load-bearing performance, traction performance and buffer performance. At the same time, it is required to have high abrasion resistance and flexural flexibility, as well as low rolling resistance and heat resistance. Half of the world's rubber is used for tyre production, and the tyre is shown to use rubber.
In the field of archaeology, most of the evidence are metal, such as musket bullet, cartridge, bullets, artillery and shells, shrapnel and/or of the sword, what are the specific evidence depends on the battle took period of history. Thus, the most important tool for field archaeologists is simple metal detectors
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