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A good correlation between the thickness of oxidation layer of Cu balls and their movement on the solder bumps has been found out, suggesting that non-oxidized Cu balls without no oxygen atmosphere could be a good condition in terms of self-alignment in packaging. We have succeeded in developing novel coated Cu balls that can be stored under mild conditions.
Titanium alloys are commonly used in biomedical application in hard tissues replacement especially for knee and hip implants but facing huge wear debris due to continuous cyclic contact within the joints of the implants. Diamond coating is a potential solution for improving the tribological and wear properties of the implants made from this alloy. Diamond is known for having high wear resistance property...
Dipole magnets for the so-called SIS-300 heavy-ion synchrotron at GSI are designed to generate 6 T with a field sweep rate of 1 T/s. It is foreseen to wind the magnets with a 36 strands Nb-Ti Rutherford cable. An important issue in the cable design is sufficiently low AC loss and stability as well. In order to keep the AC loss at low level, the contact resistance between crossing strands Rc is kept...
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