Volume

Volume 4 - Year :1954

(20)

Issue 1

(5)

	Photolysis of cellulose Author : Subramanian, T.S. Source : Defence Science Journal ; Vol:4(1) ; 1954 ; pp 1-14 Subject : 57.089 Biomedical Sciences Keywords : Cellulose ;Photolysis Abstract : "The paper reviews in brief the salient features of the work under study at T.D.E.L., Kanpur. The requisite historical background is provided. The results are reported under two main heads- (i) Fundamental studies on the action of light on cellulose, and (ii) Barriers for the prevention of light attack on cellulose. Extensive investigations, on barriers which will minimize the extent of photolysis have shown that urea-formal-dehyde resin and hydrated manganese oxide are outstanding. The mechanism of protection has been investigated."
	On the adiabatic expansion of the reaction products inside the gun Author : Murgai, M.P. Source : Defence Science Journal ; Vol:4(1) ; 1954 ; pp 15-18 Subject : 355 Defence Sciences Keywords : Gun ;Adiabatic expansion Abstract : The change in composition of the products of reaction inside the gun, during their adiabatic expansion, from the position of the all burnt to the muzzle has been considered and the temperature of the product, when they reach the muzzle, determine. While the maximum change of composition is 10 percent., the difference of temperature at the muzzle from that calculated on the basis of constant composition is only 1 percent.
	A review of research on microseisms Author : Nanda, J.N. Source : Defence Science Journal ; Vol:4(1) ; 1954 ; pp 19-26 Subject : 57.089 Biomedical Sciences Keywords : Microseisms ;Seismograms Abstract : This paper reviews the various problems of research on microseisms, and also the method of obtaining seismograms. Direction finding techniques are outlined, and possible origins of microseisms are suggested. The surf and wind theory of microseisms are compared. Mention is also made of some recent theories of microseisms. The paper shows how the subject of microseisms is closely connected with that of swell and storm prediction, a problem of interest to Defence Scientists and Meteorologists.
	Preliminary studies on the baking of chapatties Author : Majumdar, N.C. ;Parthasarathy, N.V.V. Source : Defence Science Journal ; Vol:4(1) ; 1954 ; pp 27-35 Subject : 641 Food Sciences Keywords : Bake Abstract : Assuming that the degree of baking is determined by percentage loss of moisture content, and that conduction of heat is the predominant factor in the baking of the 'Chapatties', an equation has been derived on the basis of a few simplifying assumptions, expressing the percentage moisture loss as a function of baking time and thickness of chapatties. The limitations of the equation have been discussed in the light of some preliminary observations taken under laboratory conditions, and the equation has been modified accordingly, in order to represent the experimental data with reasonable accuracy.
	Detection of land mines Author : Prabhakar Source : Defence Science Journal ; Vol:4(1) ; 1954 ; pp 36-47 Subject : 669 Metallurgy Keywords : Land mines ;Magnetic soil Abstract : "The General Theory of Metal detection is given in the earlier portion of the paper. The conflicting influences of conductivity and ferromagnetism are stressed and the difficulty of detecting metallic mines in magnetic soils is explained. The latter half of the paper deals with the principles of operation, description and comparative performances of a few mine detectors now in service use. Towards the end mention is made about the possibilities of tackling the problem of non-metallic mine detection.."