Institute's contributions: Recent submissions
Now showing items 3741-3760 of 9252
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Evaluation of the toxicity of organic matter in marine sediments
(IWA Publishing, 1992)The inhibitory effects of the organics from the sediment along the east coast of India on acetylcholinesterase (AChE) in-vitro were evaluated. Sediment samples collected from the surface layers at various depths were ... -
Phosphatic rocks and manganese crusts from seamounts in the EEZ of Kiribati and Tuvalu, Central Pacific Ocean
(Circum-Pacific Council for Energy and Mineral Resources, 1992) -
Submarine physiography off Lakshadweep Islands, Arabian Sea
(Oxford and IBH, New Delhi, 1992)Analysis of echosoundings, side scan sonar and shallow seismic data, supplementEd. by 152 sediment samples, collected along 150 km around Lakshadweep Islands, Arabian Sea, revealed that the islands have a very narrow shelf, ... -
Biogenic silica in space and time in sediments of Central Indian Ocean
(NISCAIR, New Delhi, 1992)Biogenic silica content in 50 surface sediments and in 7 sediment cores from Central Indian Ocean shows a variation from 1.88 to 35.76%, while radiolarian abundance (number.g/1 dried sediment) ranges from 500 to 345000. ... -
Geochemistry, factor analysis and clay mineral distribution of the sediments and relationship with the associated ferromanganese nodules from the SW Carlsberg ridge
(Indian Association for Limnology and Oceanography, 1992)Calcareous clay and ooze from the southwestern Carlberg Ridge show wide range of concentrations in Si (4.62-23.88%), Al (1.63-7.98%), Ti (0.43-1.70%) and CaCO sub(3) (8.50-79.75%) and reveal association of the elements ... -
Geophysical survey of marine arcaheological sites off east coast of India
(Aditya Prakashan, New Delhi, 1992) -
Geochemistry of polymetallic nodules from the Central Indian Ocean basin
(Elsevier, 1992)Polymetallic nodules dredged at fourteen stations between 12 degrees-15 degrees S and 76 degrees-80 degrees E in the Central Indian Ocean Basin (CIOB) display wide variations in shape, size, texture, mineral phases and ... -
Clay mineralogy of innershelf sediments off Cochin, west coast of India
(NISCAIR, New Delhi, 1992)Kaolinite, montmorillonite and illite are the clay minerals occurring in decreasing order of abundance in the Holocene sediments of inner shelf and adjacent coastal environments of Cochin Region. Southern part of Vembanad ... -
Late Miocene radiolarian biostratigraphy and paleoceanography of Sawai Bay formation, Neill Island, Andamans, India
(Micropaleontology Press, 1992)Late Miocene radiolarian zones are encountered from mudstone strata of Sawai Bay Formation, Neill Island, Andamans. Percentage data of forty-five coarser taxonomic groups of radiolarians were subjected to Q-mode cluster ... -
Variation in size, morphology and chemical composition of polymetallic nodules from the Central Indian Ocean Basin
(Oxford and IBH, New Delhi, 1992)Chemical composition of 613 polymetallic nodules from 150 stations in the Central Indian Ocean Basin (CIOB) are determined and variations in Mn, Fe, Cu, Ni, Co, Zn and moisture content are studied with respect to their ... -
Programmable delay circuit for sparker signal analysis
(CUSAT, Kochi, 1992)The sparker echo signal had been recorded along with the EPC recorder trigger on audio cassettes in a dual channel analog recorder. The sparker signal in the analog form had to be digitised for further signal processing ... -
Acoustic doppler methods for remote measurements of ocean flows - a review
(Indian Society for Physical Sciences of the Oceans, 1992)The evolution of acoustic doppler methods for remote measurements of ocean flows has been briefly reviewed in historical perspective. Both Eulerian and profiling methods have been discussed. Although the first acoustic ... -
A marine meteorological data acquisition system
(Oxford and IBH, New Delhi, 1992)A marine meteorological data acquisition system has been developed for long term unattended measurements at remote coastal sites, ocean surface platforms and for use on board research vessels. The system has an open and ... -
A geological and geophysical data collection system
(CUSAT, Kochi, 1992)A geological and geophysical data collection system using a Personal Computer is described below. The system stores data obtained from various survey systems typically installed in a charter vessel and can be used for ... -
A new device for monitoring moorings
(Indian Society for Physical Sciences of the Oceans, 1992)A new device - Mooring Monitoring Unit (MMU), which consists of an inwater unit and a deck unit has been designed to monitor mooring in situ. This device helps tracing underwater moorings, once its marker buoy is removed ... -
PCs and networking for oceanographic research vessels
(Indian Society for Physical Sciences of the Oceans, 1992)This paper, first describes briefly the evolution of data acquisition techniques and different system implementation, on board research vessels. A data acquisition system being developed for a coastal research vessel is ... -
The design of an in-water optical radiometer
(Indian Society for Physical Sciences of the Oceans, 1992)In-water radiometers which measure the spectral composition of the sub-surface light field can be used to correctly classify water types through an estimation of biogenous and non-biogenous matter present in the ocean, and ... -
Image sensors for radiometric measurements in the ocean
(Oxford and IBH, New Delhi, 1992)The signal to noise (SNR) performance of selected linear array image sensors belonging to the CCD (charge coupled device), SSPDA (self scanning photodiode array), and PCD (plasma coupled device) families is analysed. Our ... -
Nodule bottom backscattering study using multibeam echosounder
(CUSAT, Kochi, 1992)A study is carried out to observe the angular dependence of backscattering strength at nodule area where grab sample and photographic data is available. Theoretical study along with the experimentally observed data shows ... -
Multibeam swath bathymetry signal processing techniques
(CUSAT, Kochi, 1992)Mathematical advances and the advances in the real time signal processing techniques in the recent times, have considerably improved the state of art in the bathymetry systems. These improvements have helped in developing ...