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UHV environment 638 UHV-AVM 635 ultrahigh vacuum (UHV) 391, 418, 461, 607, 635 ultrasonic – bonding 1119 – lubrication 513 – transducer 663 ultrasound triggering 299 ultrathin DLC coatings 795 umklapp processes 125 unbinding – force 476, 481 – force distribution 485 – pathway 488 uncapped MEMS wafer 1097, 1098 uncoated monolithic cantilever 611 uncommon failure mode 1102 unconstrained binding 477 unidirectional electron transfer 28 unimolecular level 22 universality 752 unlubricated sample 879 unlubricated surfaces see dry surfaces upward cantilever deflection 746 UV-LIGA lithography 267