| || An apparatus for determining water vapour permeability of fabrics
Author : Saksena, B.L. ;Krishnan, S.S.
Source : Defence Science Journal ; Vol:5(2) ; 1955 ; pp 136-141
Subject : 687 Textiles and Clothing
Keywords : Fabrics ;Water vapour
Abstract : An apparatus for the determination of water vapour permeability (W.V.P.) of fabrics is described. The fabric partitions a closed space into two compartments in which are circulated air streams having high and low water vapour pressure respectively, without any overall pressure or temperature difference. The transfer of moisture from the high to the low humidity side of the fabric is gravimetrically measured. Results of tests are given.
| || A Fresh Approach to the Study of Atmosphere Turbidity
Author : Majumdar, N.C.;Garg, O.P.;Agarwal, B.K.
Source : Defence Science Journal ; Vol:28(4) ; 1978 ; pp 167-174
Subject : 551.5 Meteorology
Keywords : Aerosol Particles;Water Vapour;Linke's Turbidity Factor;Rational Turbidity Factor
Abstract : The problem of assessment of atmospheric turbidity caused by aerosol particles, viz., dust, smoke, haze, and other atmospheric pollutants, apart from the effect of variable water vapour content of the atmosphere, has been studied afresh. The basic concept underlying Linke's turbidity factor, T has been found to be theoretically sound, although its quantitative formulation suffers from one major defect, viz, its 'virtual variation' with air mass. This error has been traced to defective formulation of the quantitative expression for T. A 'Rational turbidity factor', Tr, has been proposed which is likely to overcome the limitations of Linke's turbidity factor, T. A nomogram has been development for quick evaluation of Tr, and the effect of altitude has also been considered.