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Biogas Production Ability of Some Raw Materials [1]

The quality of biogas depends on the source of production and the time the organic matter exists in the biogas digester. Biogas usually contains 60-70% CH 4 , 30-40% CO 2 and less than 1% H 2 S (usually in the range of 100 to 2000ppm). Other gases such as N 2 can be up to 10%, H 2 can be up to 5%. ...

Materials Based on Cu Powder and Cu Alloy

Steam oxidation method, carried out at 580 0 C in a closed furnace chamber containing steam, will create a thin layer of Fe 3 O 4 5-10 µm that is tightly packed and adheres well to the surface of the part, increasing hardness and wear resistance, for example used to manufacture pistons of ...

The Exploitation of Cultural Materials and Poetic Language

2.4. Exploitation of cultural materials and poetic language 2.4.1. Traditional cultural values ​​in Nguyen Khoa Diems ​​poetry Speaking of Nguyen Khoa Diem, everyone can easily imagine a poetic style imbued with philosophy, originating from a vast knowledge base and cultural depth in a ...

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