| || Effect of sodium dioctylsulphosuccinate on the dropping mercury electrode capacity
Author : Venkatesan, V.K. ;Menon, Sarada
Source : Defence Science Journal ; Vol:9(1) ; 1959 ; pp 14-22
Subject : 54 Chemistry
Keywords : Sodium ;Mercury ;Magnitude ;Manaxol
Abstract : Sodium dioctylsulphosuccinate (Manoxol OT) is shown to exhibit in the tensammetric curve, a hump from -0.7 to -1.0 V and a desorption peak at -1.35V. It has been shown that the hump is caused by dissolved oxygen. Effect of (a) concentration of Manaxol OT and (b) the magnitude of the a.c. ripple on the tensammetric curves has been studied and the results discussed. The D.C. polarograms indicate two waves, the first being caused by oxygen and second mainly by desorption, although the latter is also enhanced by the presence of oxygen.
| || The electro acoustic efficiency of a magnetostrictive transducer
Author : Srinivasan, D. ;Srivastava, S.S.
Source : Defence Science Journal ; Vol:9(1) ; 1959 ; pp 1-5
Subject : 534.8 Acoustics
Keywords : Acoustic ;Radiometer ;Electro-acoustic ;Magnetrostrictive
Abstract : A vane type radiometer has been constructed in the laboratory for measuring the radiation pressure due to acoustic waves from a magnetostrictive transducers. A method based on the use of this radiometer is described for calibrating underwater applications.
| || Observation on fouling organisms collected from Indian naval ships at Bombay
Author : Gopalakrishnan, V. ;Kelkar, V.V.
Source : Defence Science Journal ; Vol:9(1) ; 1959 ; pp 23-30
Subject : 621.78.019.84 Corrosion;623.8 Naval Science
Keywords : Organisms ;Ships ;Hydroids ;Polyzoans
Abstract : Fouling organisms collected from Indian Naval Ships dry-docked at Bombay during a period of two years (July 1956-June 1958) were studied in detail. Forty six of the forms collected have been identified. The most important groups of ship-fouling Organisms in Bombay waters are Barnacles, Hydroids, Polyzoans and Tube-worms. Eleven different Fouling Communities have been found to dominate the settlements on the hulls at different occasions. Definite zonations that could be observed were restriction of green algae to the boot-top area and mussels and oysters to the pipes and gratings. An attempt has been made to find the sequence of settlement of the different major fouling groups. Some general remarks on the observations have also been included.
| || Design and performance of a new room cooler
Author : Majumdar, N.C. ;Sharma, R.N.
Source : Defence Science Journal ; Vol:9(1) ; 1959 ; pp 31-37
Subject : 621.38 Electronics
Keywords : Room Cooler
Abstract : A new design of room cooler, working on capillary action has been described with relevant performance data, and compared with an existing type. Its cooling efficiency, volume output efficiency and overall efficiency are about 63%, 85% and 54% respectively. The necessity of periodic wetting of the cooling fabric surfaces has been avoided. Apart from its cheapness, simplicity and low running expenditure, it has been made reasonably free from risks, personal or otherwise. Detailed instructions and precautions for its proper use have also been included.
| || A preliminary note on the radioactivity of wrist watches with luminous dials
Author : Nagaratnam, A. ;Sastri, M.L.N.
Source : Defence Science Journal ; Vol:9(1) ; 1959 ; pp 38-39
Subject : 53 Applied Physics
Keywords : Radioactivity ;Wrist watch ;Luminous dials
Abstract : The activities of 25 wrist watches with luminous dials were experimentally measured. The mean gamma activity was 0.075 microcurie radium equivalent. Under certain simplifying assumptions the radiation dose to the gonads was calculated. The dose is not likely to exceed about 5 milliroentgens per year in the majority of cases.
| || A note on the biological assay of heparin
Author : Ghosh, A.K. ;Srivastava, R.K. ;Tanyal, J.N.
Source : Defence Science Journal ; Vol:9(1) ; 1959 ; pp 40-42
Subject : 57 Biological Sciences
Keywords : Heparin ;Biology ;Thrombokinase
Abstract : Abstract not available.
| || Some investigations on productivity control in handmade paper industry
Author : Venkatesam, A.V. ;Gopalkrishnan, A. ;Rahman, A.
Source : Defence Science Journal ; Vol:9(1) ; 1959 ; pp 43-52
Subject : 676 Paper Industry
Keywords : Paper industry ;Productivity control
Abstract : The paper gives some results of the investigations on productivity control in handmade paper industry. The advantages of splitting up the entire operation into several sub-operations for controlling the productivity have been specially indicated.
| || Physico chemical changes in valencia orange concentrate during commercial scale vacuum concentration
Author : Pruthi, J.S.
Source : Defence Science Journal ; Vol:9(1) ; 1959 ; pp 6-13
Subject : 54 Chemistry
Keywords : Orange ;Physico-chemical ;Vacuum ;Solids ;Refractometric
Abstract : "Changes in the refractometric solids (Brix), viscosity, spectral reflectance (color), pH, acidity, Brix/acid ratio, color, true ascorbic acid and carotene during commercial scale vacuum concentration of Valencia orange juice in a forced circulation, single-pass, falling-film Evaporator have been reported. With the advancing concentration, there was a gradual increase in Brix, acidity, viscosity, color, ascorbic acid and carotene, no change in Brix/acid ratio but a slight fall in pH. Upto 4-fold concentration of the Juice, the increase in viscosity was comparatively slight, but after 5-fold concentration, there was a steep rise in viscosity. There were negligible losses in carotene while the losses in true ascorbic acid were well within 5% during concentration up to 63Degree Brix. Use of mid-season, healthy ripe oranges for juice extraction and concentration of the flash-heated juice (195Degree-200DegreeF for 10-12 seconds) upto 5-fold concentration are suggested."