Peer Reviewd Journal Articles (National) (Engg)

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    An Instrument for Measuring the Pitch and Blade Thickness of Mineral Screw Propellers
    (Central Institute of Fisheries Technology, Cochin, India, 1964) Velu, M
    A simple and accurate instrument has been designed and fabricated to measure the pitch and blade thickness at various points of a marine screw propeller for arriving at a correct shape and for proper balancing of the propeller. The instrument can be utilized by pattern makers, finishing shops, boat yards, etc. With existing instruments, this measurement is very difficult and cumbersome.
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    Design of a half ton dehydrator for fish
    (Society of Fisheries Technologists(India),Cochin, 1964) Swaminath, M.
    A half-ton capacity artificial dryer has been designed at the Central Institute of Fisheries Technology for drying fish like Mackerel, Sardine, White Bait etc. The dryer is a hot air recirculation type 80 K.W. thermostatically controlled beating coils are made use of for heating the air. The air is circulated by means of an axial flow pattern fan. Drying takes place at a temp. of 115 degree F. The structure of the dryer to be made of Anjili wood. The cost of one dryer comes to about Rs. 20,000/-.
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    Impulse generator for electrical fishing
    (Society of Fisheries Technologists(India),Cochin, 1967) Namboodiri, K.S.
    Since impulse current has been found to be more economical and more effective for conducting electrical electrical fishing, an impulse generator was designed and fabricated. The principle and description of the impulse generator are given in the paper. Eventhough it is not giving theoretical value of the impulse voltages has been found that for conducting electrical fishing it is producing necessary voltages.
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    Operational depth telemeter for use in fishery practice
    (1969) Sivadas, T. K.
    An electronic instrument capable of measuring the depth of operation of fishing gear or any other object in the range 0-100 m with an accuracy of ± 1 m is described. The main components of the instrument are a hydrostatic inductive type pressure transducer and an electronic solid state indicating meter. The range of measurement can be extended considerably (up to 1000 in) by making easy adjustments in the instruments. The advantages of the instrument over those currently in use are its light weight, ruggedness and low cost.
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    Indigenous substitutes for` lignum vitae' for making stern bearings for fishing boats
    (Society of Fisheries Technologists(India),Cochin, 1969) Velu, M.; Sivadas, T.K.
    Difficulties are very often encountered in selecting proper material for making stern bearings for fishing boats. Conventional materials such as white metal, bronze etc wear out too fast also causing considerable wear to the propeller shaft. Lignum vitae, a natural wood commonly used for this purpose, is not available on a commercial scale in our country. Results of trials carried out to find out suitable substitutes for Iignum-vitae from among indigenous timbers are presented in this paper.
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    A small scale fish meal dryer
    (Society of Fisheries Technologists (India), 1970) Chakraborty, P.K.; Pillai, S.A.; Balachandran, K.K.
    A batch type rotary drum dryer for the production of fish meal suitable for operation in the fishing villages of India has been designed, fabricated and operated successfully . The dyer can be used for production of fish meal from whole lean fish or press-cake from fish body oil extraction plants . The time taken to reach a moisture level below 10% is 5-8 hours depending upon the type of material fed into the dryer.
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    Underwater warp tension meter
    (Society of Fisheries Technologists (India), 1970) sivadas, T.K.
    A self contained electronic solid-state instrument capable of measuring the tension between the different parts of a trawl net in operation, has been designed and developed for the measurement in the range 0 to 300 kg with an accuracy of -t- 2 kg . The instrument is useful for measuring the resistance to motion of various accessories of a trawl net . It consists of an inductive type underwater tension transducer and an electronic indicating meter kept on board the vessel, both the units being connected by electric cable .
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    Instrumentation in fishing gear research
    (1970) Sivadas, T. K.
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    Equipment for removal of sand from beach dried spratts
    (1970) Chakraborty, P. K.
    Sand adhering to spratts (a major item of dry fish exports from India) dried by the conventional sun-drying technique, affects adversely the export quality of the fish. A simple equipment designed and fabricated for the removal of sand from the fish is described. The equipment consists of a wire mesh drum provided with three horizontal coir brushes supported on a central shaft. The drum and the brushes rotate in opposite directions, providing the desired abrasive action for cleaning the fish. The operational conditions for attaining maximum cleaning efficiency (removal of 70-80% of the sand originally present) have been worked out.
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    Instruments and data acquisition systems for research on trawl nets
    (Society of Fisheries Technologis(India), 1971) Sivadas, T. K.
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    Development of an electric trawl - I - Reaction of shrimps to low volt direct current
    (Society of Fisheries Technologis(India), 1971) SreedharanNamboodiri, K.
    Preliminary attempts were made to assess the effect of direct current on shrimps and to see whether the shrimp could be guided in large numbers into the fishing net by using a current of appropriate voltage without scattering them away as it happens at present. This communication is the first in the series of studies and primarily deals with laboratory equipments and experimental procedures followed
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    Thermal insulation boards from coconut pith
    (Society of Fisheries Technologis(India), 1971) Rao, C. V. N.; Prabhu, P. V.; Venkataraman, R.
    Processing technique and physical characteristics of thermal insulation boards prepared from coconut pith using rubber latex as the binding agent are reported in this communication. In view of the easy processing, low cost and comparable physical properties with other insulating materials available indigenously, manufacture of these boards appears to be promising.
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    An instrument for the measurement of the variations in mesh shapes of fishing nets during operation
    (1971) Sivadas, T. K.
    A solid state electronic portable instrument developed for the measurement of the variations in the dimensions of the meshes of fishing nets during operation is described. The instrument consists essentially of an inductive linear transducer and an indicating meter kept on board the vessel, both being connected by electric cable. The accuracy of measurement is ±2 mm.
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    Design of refrigerated sea water plant for preservation of fish
    (Society of Fisheries Technologists (India), 1974) Pillai, A.S.
    To study the feasibility of employing refrigerated sea water on board fishing vessels for the preservation of fish, a pilot model has been designed, the details of which are presented in this paper .
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    Pilot plant for the production of fish ensilage and the economics of production
    (Society of Fisheries Technologis(India), 1976) Chakraborty, P.K.; Arul James, M.
    This communication describes the design aspect and functions of individual pieces of equipment of a pilot plant for the production of fish ensilage based on lactic acid fermentation process. Details about the equipment, process flow sheet and equipment layout of the pilot plant have been given. An attempt has been made to prepare an estimate of the cost of production of liquid ensilage and solid feed mix.
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    Reliability and need for standardisation of electrical systems in small wooden fishing vessels
    (Society of Fisheries Technologis(India), 1976) SreedharanNamboodiri, K.
    The working condition and atmosphere in a wooden fishing vessel are generally most injurious to the electrical systems. Therefore great care has to be taken in designing electrical systems for small crafts. This paper deals with the difficult operating conditions and standardisation of electrical systems as applicable to small fishing vessels,
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    Portable electronic warp load meter
    (Society of Fisheries Technologists (India), 1978) Sivadas, T.K.
    A portable type warp load meter has been developed for the use in fishing trawlers. The instrument enables to monitor the warp load in fishing trawlers accurately and easily without disturbing the routine fishing operations. The instrument can be used in several other places like cranes, bollard tests for marine engines, dry docks etc. especially when the operation has to be conducted easily without disturbing the load system. The information displayed in microammeter in the range 0 to 1000 kg can be fed to continuous recorders for detailed analysis and permanent records.
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    In situ temperature and salinity meter
    (Society of Fisheries Technologists (India), 1978) Sivadas, T.K.
    Development of a portable self contained electronic meter for on the spot determination of temperature and salinity is described. Instant and remote measurements of temperature and salinity of sea and estuarine waters in the range of 25-30 C and 30-35 C for temperature with an accuracy 0.05C and 0.37o/oo and 31-37o/oo for salinity with an accuracy of 0.2o/oo and 0.05o/oo respectively are possible with the instrument. The temperature compensations of the salinity measurements are done manually with the help of temperature charts. The temperature and salinity measurements can be fed to continuous recorders
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    Freezer temperature monitor and alarm
    (Society of Fisheries Technologists (India), 1982) Ramakrishnan, K.; Vijayabharathi, K.; Sivadas, T.K.
    An electronic instrument for measuring freezer temperature in the range of +40 to -40 degree C is described. The salient features of the instrument are remote display, (digital and analogue versions with an accuracy of plus or minus 0.1 and plus or minus 0.5 degree C respectively), and provision for continuous record of temperature. Two types of sensors using thermistor and P.N. junction of transistor were used for temperature sensing.
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    Autobrinometer
    (Society of Fisheries Technologists (India), 1982) Vijayabharathi, K.; Ramakrishnan, K.; Sivadas, T.K.
    An instrument developed for the rapid and accurate measurement of brine concentrations during blanching without disturbing the routine blanching operation is described. The concentration is sensed by a plantinum electrode conductivity cell and displayed in a moving coil meter after conversion of the electric signals into D.C. voltage. The instrument can measure in the range 5 to 12% with an accuracy of plus or minus 1%. The errors caused mostly are those due to wide temperature variations of the brine between 95 to 102 degree C and the unknown quantities of protein.