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contact mechanics, fracture and fatigue of engineering materials, finite element modeling of surface contact and machining, thin-film processing and characterization, adhesion and fatigue of MEMS devices, plasma-assisted surface functionalization of biomaterials, surface patterning for cell adhesion and growth control, mechanics & tribology of magnetic recording devices, microfibrous scaffolds for tissue engineering, tribology and mechanics of artificial joints, mechanical metamaterials

biogeochemistry, iron reduction, metals and contaminants, soil aggregates, selenium kinetics of organic matter degradation, nitrate reduction, soil and environmental biogeophysics, biogeochemical cycles, fate and transport of nutrients, sulfate reduction, wetland soils, littoral sediments, spatial variation in biogeochemical processes