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 .
Modeling of chemical reactors—XXIX mixing-cell model for packed bed reactors. Steady state considerations. Problems of multiplicity
Abstract The axial heat and mass transfer in tubular catalytic reactors may be described by mixing-cell model and diffusion model as well. The diffusion description yields for a strong exothermic reaction and adiabatic conditions three steady state profiles, on the other hand the mixing-cell model gives rise to more than three steady states. A simple numerical and graphical analysis for mixing-cell model is presented.