Institute's contributions: Recent submissions
Now showing items 3801-3820 of 9429
-
Contribution from coastal laterites to the nearshore placers of central west coast of India
(Museo Geologico di Bologna, 1991)The heavy mineral placers with variable concentrations of ilmenite and magnetite occur in the surface and in the sub-surface sediments of many bays along central west coast of India. These sediments are associated with ... -
Pleistocene events recrodEd. by shallow seismic profiling over the continental shelf off Krishna-Godavari Deltas
(Geological Society of India, 1991) -
Speciation of iron and manganese in the sediments of Mandovi Estuary
(CAS in Marine Biology, Parangipettai, 1991)Several attempts have been made to study the distribution of iron and manganese in Mandovi Estuary, Goa, India. But this is the first report of its kind on the speciation of these metals in sediments from Indian waters. ... -
Marine survey techniques: A prerequisite for exploratory fishing
(NIO, Goa, 1991)The topography of the sea floor is an essential tool for almost every exploration or exploitation program. Bathymetric charts are used for the measurement of topographic variation of the sea bed. The calibration by the ... -
Studies on coaxial circular array for underwater transducer applications
(Acoustical Society of America, 1991) -
Significance of relative velocity in drag force or drag power estimation for a tethered float
(NIO, Goa, 1991)There is difference in opinion regarding the use of relative velocity instead of particle velocity alone in the estimation of drag force or power. In the present study, a tethered spherical float which undergoes oscillatory ... -
Methods in mooring deep sea sediment traps
(NIO, Goa, 1991)The experience gained during the process of deployment and retrieval of nearly 39 sets of deep sea sediment trap moorings on various ships like FS Sonne, ORV Sagarkanya and DSV Nand Rachit are outlined. The various problems ... -
A technique for detection of savonius rotar oscillation
(NIO, Goa, 1991)Laboratory and field experiments by many investigators have shown that an effect of oscillatory flows on a Savonius rotor current meter is over-speed registration during flow lag. The exact reason for this phenomenon appears ... -
Tide gauge
(NIO, Goa, 1991) -
Design improvements in box dredges to enhance the collection of manganese nodules
(Offshore Technology Conference, 1991)Design of three box dredges along with the technique and modifications effected to anable bulk sampling of manganese nodules is presented. Incorporation of a sled, angled cutting edges, retention plates and increased size ... -
On-line data acquisition system for Aanderaa weather station
(NIO, Goa, 1991)Aanderaa Weather Station can be installed at unattended remote places for collection of various weather parameters at regular preselected intervals. The weather parameters are recorded on the magnetic spool inside a battery ... -
Is the interface OK?
(IETE, 1991)When a peripheral device fails, software methods can be initially resorted to before the usual hardware test procedures are used. A test program is presented here that allows various peripherals, inter-faced to a Norsk ... -
Bioecology of an articulated coralline alga Amphiroa fragilissima from Anjuna, Goa, Central Western Coast of India
(Oxford and IBH, New Delhi, 1991)An articulated coralline alga Amphiroa fragilissima L. Lam. was found to exhibit spasmogenic and hypotensive activities due to the presence of a biogenic amine. This biologically active alga was studied for its bioecology. ... -
Subsurface ammonium maxima in northern Bay of Bengal
(Elsevier, 1991) -
Geographical extent of denitrification in the Arabian Sea in relation to some physical processes
(Ifremer/ CNRS/ IRD/ Editions scientifiques et medicales Elsevier SAS. Tous droits reserves, 1991)Utilizing all the available data, the distribution of nitrite at the secondary nitrite maximum is studied to delineate the boundaries of the denitrification zone and to understand some of the processes that control the ... -
Chemical examination of the Red alga Acanthophora spicifera
(Oxford and IBH, New Delhi, 1991)Analyses of petroleum ether and chloroform extracts of the marine alga Acanthophora spicifera exhibiting antifertility activity led to the isolation of sterols and fatty acids as well as the rare dipeptides aurantiamides. ... -
Nitrous oxide in the Arabian Sea
(Pergamon, 1991)Measurements of nitrous oxide (N2O) at 16 stations in the Arabian Sea reveal high degrees of surface saturation (186 plus or minus 37%) and consequently large atmospheric fluxes of N2O (4.46 plus or minus 2.60 mu mol ... -
A toxin from Holothuria leucospilota (Brandt)
(Oxford and IBH, New Delhi, 1991)Holothurians are marine echinoderms. Despite their limited mobility and absence of a protective hard shell, they are seldom preyed upon. Thus, one would expect them to have some type of chemical defence mechanism in the ... -
Arsenic content in certain marine brown algae and mangroves from Goa coast
(NISCAIR, New Delhi, 1991)Arsenic has been estimated in 7 species each of brown algae and mangroves, including different parts of Sargassum cinereum. Arsenic is more concentrated in brown algae [concentration /factor(CF) range 1.5 - 7 x 10 super(3)] ...