| || Simulation of third order systems with simple lead using one operational amplifier
Author : Wadhwa, L.K.
Source : Defence Science Journal ; Vol:14(3) ; 1964 ; pp 247-254
Subject : 681.5.017 Simulation
Keywords : Linear system;Operational amplifier
Abstract : A method has been developed for the simulation of third order linear systems in electronic analogue control and computation, with the aid of only one operational amplifier and a few two-terminal impedances. The circuits have been analysed and condition of physical reliability discussed.
| || Propagation of V.H.F. radio waves in mountainous terrains polarisation effects
Author : Rao, B.L.N. ;Roy, B.K ;Mathur, H.B. ;Gupta, U.C. ;Jai Prakash ;Verma, P.P
Source : Defence Science Journal ; Vol:13(4) ; 1963 ; pp 249-256
Subject : 551.58 Climatology;551.5 Meteorology
Keywords : Linear Systems ;Circuit ;Operational amplifier
Abstract : Diffraction plays an important pat in V.H.F.radio wave propagation in mountainous terrains. The classical diffraction theory does not take into account the effect of polarisation. an experimental study of the effect of polarisation was made which indicates that horizontally polarised waved give greater diffracted fields than vertically polarised waved in the shadow region. The possible reasons for this were analysed.