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pa r t i c ipa t i on of i n d i v i d u a l s w i th d i s a b i l i t i e s in a c a d e m i c , e m p l o y m e n t , r e c r e a t i o n , a n d o t h e r ac t i v i t i e s . H o w e v e r , to r e a c h th is goa l , t e c h n o l o g y mus t b e a c c e s s i b l e to, a v a i l a b l e to , and u s a b l e by e v e r y o n e . T h e a u t h o r s o f th i s a r t i c l e s h a r e c o m...

Ed. No te : In the RC osc i l l a to r the amp l i tude o f o s c i l l a t i o n i s c o n t r o l l e d b y a t h e r m a l l y s e n s i t i v e r e s i s t a n c e i n t h e f o r m o f a s m a l l t u n g s t e n l a m p . T h i s c o n t r o l e l e m e n t g i v e s the osc i l l a to r i t s cha rac te r i s t i c cons tancy o f ou tpu t l eve l ove r a w ide range o f ope ra t i ng con...

p h o n o n s o f i s o l a t e d i m p u r i t i e s , t h e s e c o n d c o n c e r n s o p t i c a l d e p h a s i n g b y i m p u r i t y i m p u r i t y i n t e r a c t i o n s , a n d t h e t h i r d i n v o l v e s q u a n t u m m e c h a n i c a l e n e r g y t r a n s p o r t i n a nearest-neighbor-interaction s u b s t i t u t i o n a l l y d i s o r d e r e d l a t t i c e -q u a n t...

I. I n t r o d u c t i o n The 4 f o r b i t a l i n t h e l a n t h a n i d e s e r i e s has a s m a l l s p a t i a l e x t e n t and i s l o c a t e d i n s i d e t h e 5s5p c o r e . As a r e s u l t t h e 4 f 4 f Coulomb i n t e r a c t i o n U i s l a r g e and t h e h y b r i d i z a t i o n A b e t w e e n t h e 4 f s t a v e and t h e c o n d u c t i o n s t a t e s i s sma 1. I n som...

I n t r o d u c t i o n . I n hydrogenated amorphous S i f i l m s p r e p a r e d by plasma d e p o s i t i o n f r o m monos i lane , t h e r e a r e t o o many p a r a m e t e r s i n d e t e r m i n i n g t h e i n c o r p o r a t i o n manner o f hydrogen and i m p u r i t y atorns and t h e r e b y s t r u c t u a l and e l e c t r o n i c p r o p e r t i e s [ l , 2 , 3 , 4 ] . W h i l e...

S U M M A R Y — A 2 y e a r o l d b o y w a s a d m i t t e d o w i n g t o a s u b a c u t e e p i s o d e o f a t a x i c g a i t a n d h e a r i n g d e f i c i t . C o m p u t e r i z e d t o m o g r a p h y ( C T ) w a s n o r m a l a n d c e r e b r o s p i n a l f l u i d ( C S F ) a n a l y s i s r e v e a l e d g a m m a g l o b u l . n s l e v e l o f 1 5 . 4 % ( n o r m a l 7 t o 1 4...

The p r o b l e m o f p l a n n i n g s a f e t r a j e c t o r i e s f o r compute r c o n t r o l l e d m a n i p u l a t o r s w i t h two movab le l i n k s and m u l t i p l e deg rees o f f r eedom i s a n a l y z e d , and a s o l u t i o n t o t h e p r o b l e m p r o p o s e d . The key f e a t u r e s o f t h e s o l u t i o n a r e : 1 . t h e i d e n t i f i c a t i o n o f t r a j...

MICRODOSIMETRY..AND THE THEORY OF STRAGGLING. Theoretical developments in microdosimetry (the determination of the spatial distribution of energy deposition on a microscopic scale) are described. It is pointed out that microdosimetric theory is equivalent to LET theory plus straggling theory. The influence of each of the different random factors (varying LET, varying track length, varying numbe...

T h i s work investigates problems encountered in the application of one color resonant two-photon ionization as an ionization source in supersonic beam mass spectroscopy. Of particular interest is the fact that photons of one color may not provide sufficient energy to cause ionization even when the laser source is tuned to an excited vibronic molecular state. We have therefore correlated trend...