Informatics Publishing Limited

D. Narayanamurti

Abstract

No abstract

Full Text

     

S. N. Kapur , D. Narayanamurti

Abstract

Experiments on the sorption of aqueous vapour by various barks at various humidities have been carried out for the first time. The results indicate that tree harks, with regard to sorption of water vapour, behave similar to wood. The maximum sorption at saturation humidity varies from 22%to 28%. Oven-drying does not reduce the sorption of water vapour by bark appreciably. The mechanism of sorption of vapours bv porous adsorbents is very briefly discussed. The importance of the data obtained to pharmacy and bark using indnstries is emphasized.

Full Text

     

S. N. Kapur , D. Narayanamurti

Abstract

No abstract

Full Text

     

D. Narayanamurti

Abstract

No abstract

Full Text

     

D. Narayanamurti , Jaswant Singh

Abstract

No abstract

Full Text

     

D. Narayanamurti , A. Purushotham , V. Ranganathan , N. C. Jain , J. N. Pande , Joseph George , B. S. Bist

Abstract

No abstract

Full Text

     

D. Narayanamurti , A. Purushotham , V. Ranganathan , N. C. Jain , J. N. Pande , Joseph George , B. S. Bist

Abstract

No abstract

Full Text

     

D. Narayanamurti , A. Purushotham , V. Ranganathan , N. C. Jain , J. N. Pande , Joseph George , B. S. Bist

Abstract

No abstract

Full Text

     

D. Narayanamurti , V. Ranganathan , R. S. Ratra

Abstract

A simple diffusion cell (which can be easily constructed from perspex sheeting) for studying the passage of molecules, ions, gases, vapours and liquids through wood and other membranes is described. The diffusion of ions through some species of Indian timbers under a variety of conditions has been studied and the results reported. The results show that the diffusion of ions through wood obeys Fick's law as long as the ion does not react with any constituents of the wood. In other cases there is deviation from this law. The diffusion constant is largest in the axial direction and smallest in the tangential direction. As against other claims, for the species tested, ionic diffusion is higher through sapwood than through heartwood. Temperature increases the rate of diffusion of ions. Diffusion of copper sulphate through cellophane is in conformity with Fick's law and is of the same order as for some timbers.

Full Text

     

D. Narayanamurti , N. R. Das

Abstract

No abstract

Full Text

     

D. Narayanamurti

Abstract

No abstract

Full Text

     

D. Narayanamurti , Jaswant Singh

Abstract

The chief protein of the seeds of Terminalia belerica and Duabanga sonneratioides is globular in nature. The seeds of Cassia tara are rich in both albumins and globulins. The proteins have been analysed for their Van Slyke nitrogen distribution and tyrosine and tryptophane contents. The Terminalia belerica and Cassia tora globulins while comparing favourably with the globulins of Santalam album, are rather poor in tryptophane content as compared with Dolichosin but are superior to Cajanin. The Duabanga sonneratioides globulin is poor in cystine also. The albumins from Terminalia belerica and Cassia tora are essentially inferior to the albumin from Cajanus indicus in their cystine contents.

Full Text

     

D. Narayanamurti , Joseph George , N. Subranyan , N. R. Das

Abstract

No abstract

Full Text

     

D. Narayanamurti , N. C. Jain

Abstract

No abstract

Full Text

     

D. Narayanamurti

Abstract

In a brief introduction the importance of fibre boards as building materials is pointed out. The work done at the Forest Research Institute, Dehra Dun is described, which included investigation on insulation as well as hard boards (both by the Asplund defibrator process as well as by a mild cooking process). The raw materials studied included hard woods, soft woods, bamboos, tapioca stems, tree barks, etc.) The results of strength and other tests are represented in tables as well as in graphs from which the influence of various variables on the properties of the resulting boards can be seen. The results of the investigation show that satisfactory boards can be made from indigenous materials.

Full Text

     

D. Narayanamurti

Abstract

The present shortage in timber and decreasing supplies of preferred woods can be met by (1) improvements and rationalization in technique, (2) development of processes for upgrading the material and (3) development of products from low grade material. Improved techniques in lathe construction and methods of handling, peeling, clipping. splicing, etc., enable smaller sized logs and inferior species or species considered hitherto unsuitable to be used. Such veneer can be used for flush doors, baskets, wood ware, etc. Difficult to peel timbers like Cryptomeria japonica may not offer difficulties in slicing. Overlays upgrade veneer or solid wood by (1) reducing moisture pick up and thus reducing working, (2) providing scuff resistance and by improving the strength and stiffness of wood, reducing checks and grain raising and gives excellent surface for paints and improved wear resistance. They also hide defects. Inferior species which may be nondurable and unsuitable can be used in the form of laminated, impregnated or compressed or other forms of modified wood. Low grade material can also be used for chipboards, fibre and other building boards.

Full Text

     

D. Narayanamurti

Abstract

The Paper points out the countinued need for wood and timber production for the world's economy inspite of the likelihood of its being "eliminated from the structural and energy fields." It puts in a plea for pure research, though there may be a time-lag between a fundamental discovery and its application. The need for continuing research towards improved utilisation of wood, production of wood products and the manufacture of composition products from wood waste, is emphasised.

Full Text