Applied & Engineering Physics 

(AMS)

(ASME)

(SIAM)

Can be searched simultaneously as INSPEC and NTIS using the same interface

Cited reference searching; allows searching of articles cited by each paper and, conversely, papers than cite them.

Polymers and ceramics

Metals and alloys

Can be searched simultaneously with Compendex and NTIS using the same interface (Engineering Village 2)

Mathematics

American Institute of Physics journals