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Large scale single-crystalline graphene was achieved on copper foils with CH4 as the precursor with a sandwich method. With a PMMA-assisted method, single-crystalline graphene was transferred to the marked SiO2/Si substrate. Quantum Hall devices will be fabricated by E-beam lithography and metallization. And, quantum Hall effect will be measured.
The research of welding parameters, such as surface absorption rate, laser power, welding speed on laser welding process, weld depth and weld width are discussed by means of finite element simulation. In the article, it takes 5A06 aluminum alloy welding as the example to build the finite element model. Finite element model can forecast the weld shape under different welding parameters, and can realize...
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