Informatics Publishing Limited

N. K. Shukla , A. K. Khanduri , Krishan Lal , Mohan Lal

Abstract

Based on the tests conducted on small clear specimens of Acacia benthamii, Casuarina cunninghamiana, Eriobotrya joponica. Milingtonia hortensis, Prosopis juliflora and Thuja orientalis from some localities, their physical and mechanical properties have been reported and discussed. The safe working stresses for structural purposes and suitability indices for various Industrial and engineering uses have also been reported. While the avilable data on all the species is not sufficient for drawing firm conclusions about their utilisation for different end uses, it has been found that Millingtonia hortemis and Prosopis juliflora are more suitable from strength point of view, for constructional purposes, tool handles and railway sleepers. Prosopis juliflora has also been found suitable for dunnage pallets.

Full Text

     

N. K. Shukla , P. C. Verma , Krishan Lal , Mohan Lal , S. N. Sanyal

Abstract

Based on the tests conducted on small clear specimens of plantation grown Acacia leucophloea. A. nilolica and A. tortilis from Mohindergarh (Haryona), their physical and mechanical properties have been reported and discussed. Although all the three species are heavier than Teak, they are not superior to Teak in several mechanical properties. Based on suitability indices, these species have been grouped as very heavy and moderately steady timbers. From strength point of view, all the three species are suitable for constructional purposes, railway sleepers, tool bandies, fence posts, agricultural implements, anvil blocks, mallet heads etc. A. nilotica and A. tortilis are also suitable for the manufaCture of dunnage pallets.

Full Text

     

S. V. Singh , Krishan Lal , S. S. Bhandari , S. P. Singh

Abstract

The paper gives a comparative account of the evaluatinn of Su-babul (L leucocpphala) ,grown in Pune. At Siliguri and Rajabhatkhawa, for bleached grade kraft pulp. The data on pulping and bleaching properties indicate that the wood from all the three sources can be pulped to obtain bleachable grade pulp (Kappa No 26 ± t) using 17% active alkali as Na₂O. The bleached pilip yield was about 45% in an the three cases. To achieve a pulp of 7% brightness CEH sequence with total chlorine application of 9.7% was adequate for samples for Pune and Rajabhatkhawa; whereas in case of Siliguri sample another stage of hypochlorite (2% av. Chlorine) was needed. The strength properties data indicate that wood of all the three localities is suitable for producing bleached kraft pulps for writing and printing papers. It was found that fibre characteristics (The Runkel ratio and shape factor) had marked influence on strenglh properties. The tensile index, tear index and burst index decreased with increase in the hunkel ratio and shape factor.

Full Text

     

Krishan Lal ¹

Affiliations
1 Terminal Ballistics Research Laboratory, Research and Development Organization, Ministry of Defence, Chandigarh, IN

Abstract

In the small interval of time it is hoped and noticed that superficial injuries are caused by the X-rays as little as 0.8 r/day where r is the unit of X-ray and is called ‘ROENTGON’ which is the “quality of X-ray or r ray radiation whose association corpuscles emission would produce 1 esu of electricity in 1 cc of air at N.T.P.”

Full Text