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By D. Gale Johnson

ISBN-10: 0814741681

ISBN-13: 9780814741689

E-book via Johnson, D. Gale, Hemmi, Kenzo, Lardinois, Pierre

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The wider c r o s s - s e c t i o n gives improved t r a c t i o n and f l o t a t i o n and the lower u n i t ground pressure can improve the r e s i s t a n c e t o damage from stones and other ob­ jects. (iii) Low s e c t i o n - h e i g h t t y r e s . The wide base p r i n c i p l e can be extended i n t o low s e c t i o n - h e i g h t t y r e s . 5 compares two t y r e types. The low s e c t i o n height shape makes p o s s i b l e a wider c r o s s - s e c t i o n f o r improved f l o t a t i o n w i t h o u t increasing o v e r a l l diameter or t y r e w e i g h t , as would have been necessary i f con­ v e n t i o n a l t y r e shapes had been maintained.

F i g . 5. ( D ' A v e l l o , 1964). Example of low s e c t i o n - h e i g h t off-highway t y r e . F i g . 6. Sand t y r e . Single t o replace d u a l . (Finney, 1961). (Finney, 1961). the change from dual t y r e s t o one large s i n g l e t y r e reduces t o t a l ground cont a c t a r e a , experience has shown t h a t f l o t a t i o n and m o b i l i t y are improved w i t h out r e d u c t i o n in t o t a l l o a d - c a r r y i n g c a p a c i t y , (Finney, 1961). (v) Tread p a t t e r n .

2 ( H a r r i s o n , 1981) shows a g r a i n size range o f deposited snow. P r a c t i c a l experience i n d i c a t e s t h a t the highest s t r e n g ths are achieved when the snow i s well-graded - not u n l i k e the s i t u a t i o n of coarse-grained s o i l s ( i . e . sand). However, i f the snow becomes c o a r s e - g r a i n e d , the snow w i l l l i k e l y be cohesionless and weak ( M e l l o r , 1964). 0 ( i i i ) Temperature. Local temperature has a pronounced e f f e c t on the strength p r o p e r t i e s o f snow.

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Agricultural Policy & Trade: Adjusting Domestic Programs in an International Framework by D. Gale Johnson


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