(make-array (list l1 l1) :initial-element 0)) (ra (mapcar #'(lambda (x y) (mapcar #'(lambda (z w) (setf (aref va x z) (aref smm-1 y w))) missind (iseq (length missind)))) missind (iseq (length missind))))) va)) 22) (list vi smm-1 smo))) (t (cond ((not (not missind)) (list (inverse sig))) (t (list 0 (mapcar #'(lambda (x) (elt x i)) data))))))) (defun impute (params missind presind mu data i) "Ar...

The investigation of vertical transport in semiconductor heterojunction systems has recently undergone a renaissance due to improved epitaxial techniques in a number of material systems. By usin resonant tunneling, we can perform electronic spectroscopy not only o f the double barrier structure itself, but of any system (with quantized well states) suitably coupled to a resonant tunneling spect...

Measurements have been made of the sputtering yields, the mass spectra of ejected molecules, and ejection rates for various kiloelectronvolt ions incident on sodium sulfide (Na2S). The sputtering yields were small compared to those measured earlier for the more volatile sulfur ($8) and SO2 due to the strong ionic bonding in the solid. The mechanism of sputtering for the corotating sulfur and ox...