Institute's contributions: Recent submissions
Now showing items 4161-4180 of 9252
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Technological challenges for manganese nodule mining
(Publ. and Inf. Dir., New Delhi, India, 1994)The major technological challenges of deep-sea mining venture involve delineation of mine site and development of mining technology to bring out the minerals from extreme conditions (more than 5 km water depth, 0-3 degrees ... -
Development of manganese nodule resources in the Central Indian Ocean
(Japan Shipbuilding Industry Foundation, 1994)Resources evalution on grade and abundance of nodules using statistical methods for grab samples and photography data, combined with bathymetric and structural mapping, were carried out for delineation of the potential ... -
Relationship between size and geochemistry of polymetallic nodules from the Central Indian Ocean Basin: Significance in selection of high grade nodules
(Publ. and Inf. Dir., New Delhi, India, 1994)Morphological, mineralogical and geochemical studies on nodules of different sizes collected from the Central Indian Ocean Basin (CIOB) show two suits of nodule formation by oxic diagenetic and hydrogenous process resulting ... -
Seafloor mapping of large areas using multibeam system - Indian experience
(1994)To identify unproductive and difficult terrains, a detailed picture of the seafloor was essential. Hence, the area was resurveyed using the multibeam system hydrosweep during 1990-93. A total of 300,000 sq.km area has been ... -
Geotechnical properties of two siliceous cores from the central Indian Ocean
(CWPRS, Pune, 1994)Physical properties of the siliceous sediments from the Central Indian Basin are measured on two short cores. The properties such as water content, Atterberg limits, porosity specific gravity, wet density show the medium ... -
An observation of distribution features of cobalt rich manganese deposits
(Japan Shipbuilding Industry Foundation, 1994)Evaluation of seafloor stereo photographs, video data, and large diameter gravity core samples shows a variety of surface features associated with the crusts, nodules, and sediments covering mid Pacific seamounts. A set ... -
Marine minerals in the Indian perspective
(Department of Ocean Development, New Delhi, India, 1994) -
Application of remote sensing technology for studying littoral sediment dynamics
(Publ. and Inf. Dir., New Delhi, India, 1994)Satellite remote sensing data pertaining to two areas, one each on east and west coasts of India has been utilized to study suspended sediment dynamics within the near-shore region. For this purpose, thematic mapper image ... -
New occurrences of Australasian microtektites in the Central Indian Basin
(Meteoritical Soc. Fayetteville, USA, 1994)Thirty-three microtektites have been recovered from four different sites in the Central Indian Basin. Based on their physical properties, geographical occurrence and chemical composition, they are identified as belonging ... -
Remunerative role of foraminifera in coastal ecosystem
(M.S. Swaminathan Research Foundation, Madras, India, 1994)Due to the direct relationship between climate and economy (through agriculture), predictive models for climatic changes are very much needed. Climatic prediction is a delicate task and depends upon how well know the past ... -
A note on the Pavonina flabelliformis D'Orbigny (benthic foraminifera) from the Arabian Sea
(Association of Korean Geoscience Societies, 1994)The detailed study of the inner shelf surface sediments off Karwar (India) revealed the occurrence of a benthic foraminiferal species Pavonina flabelliformis. This is the first report of this species in the Arabian Sea. ... -
Distribution of manganese nodules, rocks and sediments in the Central Indian Ocean Basin: Factors influencing performance of mining system
(Publ. and Inf. Dir., New Delhi, India, 1994)Manganese nodule abundances in the Central Indian Ocean Basin (CIOB) as noted from seabed photographs (nil to 18.4 kg/m sup(2)) and grabs (nil to 21.5 kg/m sup(2)) are variable. The relative abundance varies from zero to ... -
Study of sub-surface sediments from northern Indian Ocean: Oceanic responses to climatic changes
(Palaeontol. Soc. India, 1994)The mean diameter and variation in isotopic composition (delta sup(18)) in thest of Orbulina universa d'Orbigny have been measured in a sediment core collected from 3869 m water depth near the Carlsberg Ridge, northern ... -
Preliminary backscatter results from the hydrosweep multibeam system
(MTS, Washington, USA, 1994)The alfred Wegener Institute recently contracted with Atlas Elektronik to upgrade the Hydrosweep multibeam bathymetry system on the polar research vessel POLARSTERN. This upgrade not only increased the swath width of the ... -
Monte Carlo simulation of diffuse attenuation coefficient in presence of non uniform profiles
(Publ. and Inf. Dir., New Delhi, India, 1994)This paper presents a Monte Carlo simulation of the vertical depth structure of the downward attenuation coefficient (K sub(d)), and the irradiance reflectance (R) for a given profile of chlorophyll. The results are in ... -
Biological and geophysical aspects of coastal structures
(Indian Inst. of Technol., New Delhi and NIO, India, 1994)Geological processes, that occur in the nearshore environment : The nearshore, environments have been strongly influencEd. by sealevel changes throughout the geological history. Much of the shallow-water region is also ... -
Application of multiplicative array techniques for multibeam sounder systems
(European Acoustics Association, 1994)Multiplicative array processing is well known for its narrow beamwidth and low sidelobe level, but the array gain is quite low. The effectiveness of such a system becomes lower, especially when the signal to noise ratio ... -
Development of drifting buoys
(Publ. and Inf. Dir., New Delhi, India, 1994)Polar orbiting satellites equipped with random access data collection and position fixing systems have made long-term remote oceanographic/meteorological observations possible by means of instrumented drifting buoys fitted ... -
Studies of high resolution array processing algorithms for multibeam bathymetric applications
(MTS, Washington, USA, 1994)In this paper a study is initiated to observe the usefulness of directional spectral estimation techniques for underwater bathymetric applications. High resolution techniques like the Maximum Likelihood (ML) method and the ...