INTERMODAL IMPACTS: INTERSTATE HIGHWAYS AND AIRPORT VIABILITY
The author examines the impact of individual interstate highway projects on airport viability in the State of Indiana from 1957 to 1970. The airports considered are or have been terminals for major trunk and local service air carriers since 1957. The total number of passengers carrier by air is taken as the measure of airport activity and viability. A multivariate time series methodology was used. It was found than the construction of new roads, which increases accessibility, is beneficial to larger airports but detrimental to the smaller local-service airports. /TRRL/
An Analysis of Transport Services and Facilities in Northern Ontario Centres: A Qualitative Approach
T r a n s p o r t a t i o n has been c o n s i d e r e d in t h e d i s c i p l i n e of geography l a r g e l y w i t h i n t h e c o n t e x t of d i s t a n c e and c o s t c o n s t r a i n t s , p a r t i c u l a r i l y w i t h r e f e r e n c e to i n d u s t r i a l l o c a t i o n d e c i s i o n m a k i n g p r o c e s s e s . These c o s t s a r e e a s i l y q u a n t i f i a b l e and r n e a s u r e a b l e , and t r a n s p o r t a t i o n g e o g r a p h e r s have t ended t o depend upon d i s t a n c e and t a r i f f c o s t s as t h e .Tiajor t r a n s p o r t a t i o n i n p u t s i n l o c a t i o n a l d e c i s i o n m a k i n g p r o c e s s e s . Th is dependency upon c o s t c o n s i d e r a t i o n s i s no l o n g e r e v i d e n t in t h e r e a l w o r l d . The p r i o r i t i e s of t h e c o n s i g n e r s ( s h i p p e r s ) and c o n s i g n e e s ( c u s t o m e r s ) have s h i f t e d l a t e l y , and t h e s e d i s t a n c e and c o s t c o n s i d e r a t i o n s a r e now examined in c o n j u n c t i o n wi th such q u a l i t a t i v e p r i o r i t i e s a s f r e q u e n c y o f t h e c o n s i s t e n c y and r e l i a b i l i t y o f s e r v i c e , w i t h t h e r e s u l t t h a t i t i s no l onge r s u f f i c i e n t t o d e a l o n l y w i t h d i s t a n c e and t a r i f f c o s t s when a s s e s s i n g t r a n s p o r t a t i o n v a r i a t i o n s over s p a c e . Very l i t t l e work h a s been done on t r a n s p o r t a t i o n s e r v i c e s , p a r t i c u l a r i l y w i th r e f e r e n c e t o t h e i r impact upon i n d u s t r i a l l o c a t i o n p r o b l e m s . Th i s r e s e a r c h i s an a t t e m p t a t p r o v i d i n g some e v a l u a t i o n of t h e q u a l i t a t i v e a s p e c t s of t r a n s p o r t a t i o n . I t u t i l i z e s t h e i n d e x i n g method in o r d e r to r e l a t e t h e v a r i o u s q u a l i t i e s of t r a n s p o r t a t i o n s e r v i c e s a t v a r i o u s c e n t r e s . The f i n d i n g s from t h e e v a l u a t i o n can be a p p l i e d to r e g i o n a l deve lopmen t p l a n n i n g , and t h e e v a l u a t i o n t e c h n i q u e can be used by t h e i n d i v i d u a l e n t r e p r e n e u r in an e f f o r t t o d e t e r m i n e t h e most advan taged c e n t r e s in t e r m s of t h e q u a l i t y o f t r a n s p o r t a t i o n s e r v i c e s a v a i l a b l e .
Exponential stabilization of an axially moving string with geometrical nonlinearity by linear boundary feedback
This paper addresses the vibration suppression problem of an axially moving string using boundary control. Taking into account large transverse motion of the string via the second-order component of Lagrangian strain, a nonlinear oscillation equation is derived for the problem by employing the Hamilton's Principle. Direct Lyapunov method is then adopted to demonstrate that a linear boundary control of negative speed feedback ensures the vibration response of the moving string exponentially stable. The main contributions are a new stability condition in terms of controller gain parameter, and a detailed demonstration on the equilibrium condition at the boundary where the control is applied.