| || Salinity and Toxicological Studies of Waters of Rajasthan Desert
Author : Bhutra, Mankanwar ;Rai, Sushila;Ghosh, P.K.;Tak, T.C.;Bhati, O.P.;Bhargava, T.N.;Gopal, R.
Source : Defence Science Journal ; Vol:31(2) ; 1981 ; pp 105-108
Subject : 579 MicroBiology
Keywords : Sulphate reducing bateria ;Guinea worm;Dissolved solids;Fluorosis;Water borne diseases
Abstract : Detailed studies on quality of ground waters of Western Rajasthan have been carried out by analysing about 1500 water samples for presence of total dissolved solids (TDS) and other normal chemical constituents. 109 ground water samples were tested for presence of 8 toxic substances viz. As, Ba, Cd, Cr/sup +6/, Pb, Se, Ag, and CN and F and NO/sub 3/. About 9 percent of the waters conform to the normal standards of drinking water i.e. contain less than 500 mg/l TDS. None of the water points has been found to be contaminated with toxic substances. However, fluoride and nitrate were present in all the samples. A survey of water-borne diseases, kidney diseases and fluorosis carried out to establish the possible correlation between prevailing diseases and dissolved solids in waters indicate that 82 percent of the reported cases are due to water-borne diseases. The guinea-worm (Dracunculus medinensis) has been found in the surface waters and sulphate reducing bacteria (Desulphovibrio desulphuricans) in the brackish water.
| || Magneto Elastic Torsional Waves in a Composite Non Homogeneous Cylindrical Shell Under Initial Stress
Author : Lahiri, Leena ;Narain, Surya
Source : Defence Science Journal ; Vol:31(2) ; 1981 ; pp 125-132
Subject : 531 Mechanics
Keywords : Frequency equation ;Visco elastic material;Orthotropic elastic material;Variable density
Abstract : This paper investigates magneto-elastic torsional waves in a composite non homogeneous cylindrical shell under initial stress. The non homogeneous character of the shell is due to the variable elastic constants C/sub ij/ and the variable density rho. The composite form of the shell is due to the combination of orthotropic elastic material and visco-elastic material of general linear type. Frequency equation for the said wave has been derived.
| || Dusty Viscous Flow Through a Cylinder of Rectangular Cross Section Under Time Dependent Pressure Gradient
Author : Rukmangadachari, E.
Source : Defence Science Journal ; Vol:31(2) ; 1981 ; pp 143-153
Subject : 532 Fluid Mechanics
Keywords : Incompressible fluid ;Drag;Flux
Abstract : Unsteady laminar flow of a dusty, viscous, incompressible fluid through a cylindrical tube of rectangular cross-section is studied when the pressure gradient varies (i) exponentially and (ii) harmonically w.r.t. time. The velocity fields for the fluid and the dust particles have been obtained. Results in limiting cases are derived. Flux and drag have been calculated. Flow through a tube of square section and flow between parallel plates have been obtained as special cases.
| || Stability of Dusty Flow Between Two Rotating Coaxial Cylinders
Author : Upadhyay, B.N. ;Pathak, R.S.
Source : Defence Science Journal ; Vol:31(2) ; 1981 ; pp 155-165
Subject : 532 Fluid Mechanics
Keywords : Principle of exchange of stabilities ;Rayleigh criterion;Relaxation time;Perturbations
Abstract : The criterion for stability of dusty fluid flow between two coaxially rotating cylinders is derived by an examination of the stability of the basic flow to arbitrary perturbations. The perturbation equations are explored under the assumption that the relaxation time tarque (= m/k) of the dust particles is small. It is observed that the flow is always stable if Rayleigh's criterion meu>eta/sup 2/ is satisfied. The principle of exchange of stabilities is discussed and the characteristic value problem is solved under the narrow-gap approximations.
| || Synthesis and Characterisation of Addition Compounds of Pyridine Carboxylic Acid Hydrazides with Tin IV Halides, Organotin IV Halides and Thicyanates
Author : Rao, D.S.S. Vara Prasada ;Aggarwal, R.C.
Source : Defence Science Journal ; Vol:31(2) ; 1981 ; pp 167-172
Subject : 547 Organic Chemistry;54 Chemistry
Keywords : Di adducts ;Pyridine nitrogen;Terminal nitrogen;IR spectral studies;DMF
Abstract : Addition compounds of the compositions SnX/sub 4/.xL and R/sub n/SnX/sub 4-n/.xL where X=Cl/sup -/, Br/sup -/, I/sup -/, or (NCS)/sup -/, R=phenyl or n-butyl, L = picolinic acid hydrazide (PH), nicotinic acid hydrazide (NH) or isonicotinic acide hydrazide (INH), x=1 or 2 and n= 1,2 or 3 have been prepared and characterised with the help of elemental analysis, molar conductance, UV and IR spectral studies. All the adducts are nonionic as evidenced from their low molar conductances in DMF. UV and IR spectral studies show that NH and INH coordiante through carbonyl oxygen and terminal nitrogen; and (PH) through carbonyl oxygen and ring nitrogen in monoadducts. All the three isometric pyridine carboxylic acid hydrazides are coordinated through pyridine nitrogen alone in the di-adducts. Octahedral geometry has been proposed for mono-as well as di-adducts.
| || Thermal Diffusion in a Moving Cylinder
Author : Marwah, I.J. ;Chopra, M.G.
Source : Defence Science Journal ; Vol:31(2) ; 1981 ; pp 87-90
Subject : 536 Thermodynamics
Keywords : Thermal distribution ;Biot number ;Transient temperature distribution
Abstract : Transient temperature distribution in a moving cylindrical rod has been obtained to trace the evolution of the steady state. The effect of the Biot number on the time required to reach steady state thermal distribution has also been depicted.
| || Studies on Potential Pesticides Part XIV : Synthesis and Biological Activities of Some New Thiosemicarbazide and Triazole Derivatives
Author : Garg, Madhuri ;Sengupta, Anil K.
Source : Defence Science Journal ; Vol:31(2) ; 1981 ; pp 91-96
Subject : 54 Chemistry;547 Organic Chemistry
Keywords : AChE inhibition ;Anti fungal activity
Abstract : Some new N-[5-(substituted phenoxymethyl)-1,3,4-oxadiazolyl-2-thioacetyl]-N-aryl-thiosemicarbazides have been synthesised by the condensation of appropriate hydrazine with aryliosothiocyanates. Cyclisation of these thiosemicarbazides in alkaline medium gives 3-[5-(substituted phenoxymethyl)-1,3,4-oxadiazolyl-2-thioacetyl]-4-aryl-5-mercapto-1,2,4-triazoles. All these compounds have been evaluated for their antibacterial properties and some of these have been screened for their anti fungal activity and AChE inhibition.
| || Computer Method for Amplitude Spectrum Analysis
Author : Ahmed, Md. Iqhbal ;Devara, P.C.S.
Source : Defence Science Journal ; Vol:31(2) ; 1981 ; pp 97-103
Subject : 551.58 Climatology;551 Geology
Keywords : Space research ;Programme in Ionosphere
Abstract : A computer programme based on Fortran IV language for doing Amplitude Spectrum Analysis (ASPEC) and the associated flow charts are explained. The importance of the programme in the ionosphere and space research is briefly discussed.